JP2020169450A - Ground improvement system, ground improvement method, rod stand, suspension device, joint rod installation method and joint rod removal method - Google Patents

Ground improvement system, ground improvement method, rod stand, suspension device, joint rod installation method and joint rod removal method Download PDF

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JP2020169450A
JP2020169450A JP2019070338A JP2019070338A JP2020169450A JP 2020169450 A JP2020169450 A JP 2020169450A JP 2019070338 A JP2019070338 A JP 2019070338A JP 2019070338 A JP2019070338 A JP 2019070338A JP 2020169450 A JP2020169450 A JP 2020169450A
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joint
joint rod
rod
installation
ground improvement
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JP7202955B2 (en
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勉 野刈家
Tsutomu Nogariya
勉 野刈家
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OK SOIL KK
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Abstract

To provide a ground improvement system, a ground improvement method, etc. that can efficiently attach and detach a joint rod.SOLUTION: A rod stand 9 has a first support portion 61 that supports a first joint rod in an upright state by engaging with a lower end portion of the first joint rod 33A used for ground improvement, and a second support portion 63 in which a second joint rod is supported in an upright state by engaging a lower end of the second joint rod 33B for ground improvement, and in this supported state, an upper end of the portion engaging the second joint rod is located below an upper end of the portion where the first joint rod and the first support portion engage with each other.SELECTED DRAWING: Figure 4

Description

本発明は、地盤改良システム、地盤改良方法等に係り、特に、ロッドスタンド、吊り装置を用いて継ロッドの取り扱いをするものに関する。 The present invention relates to a ground improvement system, a ground improvement method, and the like, and particularly relates to a rod stand and a suspension device for handling a joint rod.

従来、掘削軸部材(回転部材)を用いて地盤に穴を掘り、この穴に地盤を硬くするための地盤改良材(スラリー)を入れて地盤を硬く(改良)する工法が知られている。この工法に関する文献としてたとえば非特許文献1を掲げることができる。 Conventionally, there is known a method of digging a hole in the ground using an excavation shaft member (rotating member) and inserting a ground improving material (slurry) to harden the ground in the hole to harden (improve) the ground. For example, Non-Patent Document 1 can be listed as a document relating to this construction method.

また、上記工法において、回転部材を継ぎ足すときに(たとえば、掘削・撹拌ロッドに継ロッドを継ぎ足すときに)、地盤内に予め埋設されている回転部材(掘削・撹拌ロッドや継ロッド)を用いるものが知られている(たとえば、特許文献1参照)。 Further, in the above method, when adding a rotating member (for example, when adding a joint rod to an excavation / stirring rod), a rotating member (excavation / stirring rod or joint rod) pre-embedded in the ground is used. Those used are known (see, for example, Patent Document 1).

深層混合処理工法マニュアル編集委員会編集、「陸上工事における深層混合処理工法設計・施工マニュアル」、財団法人土木研究センター、平成16年3月改訂Edited by the Deep Mixing Treatment Method Manual Editorial Committee, "Deep Mixing Treatment Method Design and Construction Manual for Land Construction", Public Works Research Center, revised in March 2004

特許第4805014号公報Japanese Patent No. 4805014

しかしながら、特許文献1に記載の方法では、継ロッドを掘削軸部材等に継ぎ足す場合、別途穴を掘って継ロッド等をその穴に埋没させておき、この埋没させておいた継ロッドを引き抜く作業が必要であり、また、継ロッドの着脱時に、地盤改良装置(本体杭打機)を軟弱な地盤の上で移動させる必要があるので、継ロッドの着脱に長時間を要するという問題がある。 However, in the method described in Patent Document 1, when the joint rod is added to the excavation shaft member or the like, a hole is dug separately, the joint rod or the like is buried in the hole, and the buried joint rod is pulled out. There is a problem that it takes a long time to attach / detach the joint rod because work is required and it is necessary to move the ground improvement device (main body pile driving machine) on the soft ground when attaching / detaching the joint rod. ..

本発明は、上記問題点に鑑みてなされたものであり、継ロッドの着脱を効率良く行うことができる地盤改良システム、地盤改良方法等を提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a ground improvement system, a ground improvement method, and the like capable of efficiently attaching and detaching a joint rod.

請求項1に記載の発明は、地盤改良に用いる第1の継ロッドの下端部に係合することで前記第1の継ロッドを起立させた状態で支持する第1の支持部と、地盤改良に用いる第2の継ロッドの下端部に係合することで前記第2の継ロッドを起立させた状態で支持し、この支持状態では、前記第2の継ロッドに係合する部位の上端が、前記第1の継ロッドと前記第1の支持部とがお互いに係合する部位の上端よりも下方に位置している第2の支持部とを有するロッドスタンドである。 The invention according to claim 1 includes a first support portion that supports the first joint rod in an upright state by engaging with a lower end portion of the first joint rod used for ground improvement, and a ground improvement. The second joint rod is supported in an upright state by engaging with the lower end portion of the second joint rod used for the above, and in this supported state, the upper end of the portion engaged with the second joint rod , A rod stand having a second support portion located below the upper end of a portion where the first joint rod and the first support portion engage with each other.

請求項2に記載の発明は、請求項1に記載のロッドスタンドにおいて、前記第1の支持部には、前記第1の継ロッドを嵩上げするための第1のスペーサを設置する第1のスペーサ設置部が設けられているロッドスタンドである。 The invention according to claim 2 is a first spacer in which a first spacer for raising the first joint rod is provided on the first support portion in the rod stand according to claim 1. It is a rod stand provided with an installation part.

請求項3に記載の発明は、請求項2に記載のロッドスタンドにおいて、前記第2の支持部には、前記第2の継ロッドを、前記第1の継ロッドよりも少ない量だけ嵩上げするための第2のスペーサを設置する第2のスペーサ設置部が設けられているロッドスタンドである。 According to the third aspect of the present invention, in the rod stand according to the second aspect, the second joint rod is raised on the second support portion by a smaller amount than that of the first joint rod. It is a rod stand provided with a second spacer installation portion for installing the second spacer.

請求項4に記載の発明は、請求項1〜請求項3のいずれか1項に記載のロッドスタンドと、掘削・撹拌ロッドとこの掘削・撹拌ロッドに接続される継ロッドとを備えて構成される回転部材を回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良装置と、前記継ロッドを複数本格納するベッセルと、前記継ロッドをクレーンで吊るために、前記継ロッドの上端部に形成されている継手部に設置される吊り装置とを有する地盤改良システムである。 The invention according to claim 4 includes the rod stand according to any one of claims 1 to 3, an excavation / stirring rod, and a joint rod connected to the excavation / stirring rod. A ground improvement device that excavates the ground by rotating and descending the rotating member to improve the ground by mixing and stirring the ground improvement material, a vessel that stores a plurality of the joint rods, and a crane that stores the joint rods. It is a ground improvement system having a suspension device installed at a joint portion formed at the upper end portion of the joint rod for suspension.

請求項5に記載の発明は、円筒状もしくは円柱状に形成されたピン本体部と、このピン本体部の長手方向の一方の端に設けられた鍔部と、この鍔部に形成された切り欠きとを備えて構成されているピンと、地盤改良に用いられる回転部材のオス継手部が挿入される継手用貫通孔と、前記ピン本体部の中心軸を回動中心にして回動自在なように前記ピンのピン本体部が挿入され、一部が前記継手用貫通孔を通過しているピン用貫通孔と、係止部とを備えて構成されている吊り具とを有し、前記ピン本体部を前記ピン用貫通孔に挿入するときには、前記ピンの切り欠きを前記係止部が通過することで、前記鍔部と前記係止部とがお互いに非干渉状態であり、前記ピン本体部を前記ピン用貫通孔に挿入し終えた状態で前記ピンを回動することで、前記係止部と前記鍔部とがお互いに干渉し、前記ピンの抜け止めがされるように構成されている吊り装置である。 The invention according to claim 5 is a pin body portion formed in a cylindrical or columnar shape, a flange portion provided at one end of the pin body portion in the longitudinal direction, and a cut formed in the collar portion. A pin configured with a notch, a through hole for a joint into which a male joint portion of a rotating member used for ground improvement is inserted, and a so as to be rotatable around the central axis of the pin body portion. The pin body portion of the pin is inserted into the pin body, and the pin has a pin through hole through which a part of the pin body has passed through the joint through hole and a hanging tool provided with a locking portion. When the main body portion is inserted into the through hole for the pin, the locking portion passes through the notch of the pin, so that the collar portion and the locking portion do not interfere with each other, and the pin main body By rotating the pin in a state where the portion has been inserted into the through hole for the pin, the locking portion and the flange portion interfere with each other, and the pin is prevented from coming off. It is a hanging device.

請求項6に記載の発明は、請求項5に記載の吊り装置において、前記継手用貫通孔に前記回転部材の継手部が挿入されており、前記ピン本体部を前記ピン用貫通孔に挿入し終えた状態では、前記ピン本体部が、前記継手部の切り欠きと前記ピン用貫通孔とを貫通しており、前記回転部材が前記吊り具と一体化されるように構成されている吊り装置である。 According to the sixth aspect of the present invention, in the suspension device according to the fifth aspect, the joint portion of the rotating member is inserted into the through hole for the joint, and the pin body portion is inserted into the through hole for the pin. In the finished state, the pin body portion penetrates the notch of the joint portion and the through hole for the pin, and the rotating member is configured to be integrated with the suspending tool. Is.

請求項7に記載の発明は、掘削・撹拌ロッドを備えて構成されている第1の回転部材が設置され、上下方向に移動自在である第1の設置部と、前記第1の回転部材と同様に構成されている第2の回転部材が設置され、前記第1の設置部とともに上下方向に移動位置決め自在である第2の設置部とを備え、前記各設置部のそれぞれに装着された各回転部材のそれぞれを回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良装置に、請求項2に記載のロッドスタンドを用いて継ロッドを設置する継ロッド設置方法において、前記第1のスペーサが設置されている第1の支持部に第1の継ロッドを設置し、前記第2の支持部に第2の継ロッドを設置する継ロッド設置工程と、前記継ロッド設置工程で前記各支持部のそれぞれに前記各継ロッドのそれぞれが設置されている状態で、前記地盤改良装置の第1の設置部を前記第1の継ロッドの上側に配置し、この配置後に、前記第1の設置部の下端が前記第1の継ロッドの上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第1の設置部に対する前記第1の継ロッドの上端部の継手部の位置合わせを行うとともに、前記各設置部をさらに下降して、前記第1の設置部に前記第1の継ロッドの継手部を挿入し、前記第1の継ロッドを前記第1の設置部に設置する第1の継ロッド設置工程と、前記第1の継ロッド設置工程で前記第1の設置部に前記第1の継ロッドを設置した後、前記第1の支持部から第1のスペーサを取り除き、前記第2の設置部の下端が前記第2の継ロッドの上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第2の設置部に対する前記第2の継ロッドの上端部の継手部の位置合わせを行うとともに、前記各設置部をさらに下降して、前記第2の設置部に前記第2の継ロッドの継手部を挿入し、前記第2の継ロッドを前記第2の設置部に設置する第2の継ロッド設置工程とを有する継ロッド設置方法である。 The invention according to claim 7 comprises a first installation portion in which a first rotating member configured to include an excavation / stirring rod is installed and is movable in the vertical direction, and the first rotating member. A second rotating member having the same configuration is installed, and together with the first installation portion, a second installation portion that can be moved and positioned in the vertical direction is provided, and each of the installation portions mounted on each of the installation portions is provided with a second installation portion. A joint rod is installed using the rod stand according to claim 2 in a ground improvement device that excavates the ground by rotating and descending each of the rotating members to improve the ground by mixing and stirring the ground improvement material. In the joint rod installation method, the first joint rod is installed in the first support portion where the first spacer is installed, and the second joint rod is installed in the second support portion. In the step and the joint rod installation step, in a state where each of the joint rods is installed on each of the support portions, the first installation portion of the ground improvement device is placed above the first joint rod. After the arrangement, each of the installation portions is lowered until the lower end of the first installation portion is located at the upper end of the first joint rod, and after this lowering, the first installation portion is subjected to the arrangement. The joint portion of the upper end portion of the first joint rod is aligned, and each installation portion is further lowered to insert the joint portion of the first joint rod into the first installation portion. After installing the first joint rod in the first installation portion in the first joint rod installation step of installing the first joint rod in the first installation portion and the first joint rod installation step. , The first spacer is removed from the first support portion, and each installation portion is lowered until the lower end of the second installation portion is located at the upper end of the second joint rod, and after this lowering. The joint portion of the upper end portion of the second joint rod is aligned with respect to the second installation portion, and each installation portion is further lowered to the second installation portion with the second joint rod. It is a joint rod installation method including a second joint rod installation step of inserting the joint portion of the above and installing the second joint rod in the second installation portion.

請求項8に記載の発明は、掘削・撹拌ロッドを備えて構成されている第1の回転部材が設置され、上下方向に移動自在である第1の設置部と、前記第1の回転部材と同様に構成されている第2の回転部材が設置され、前記第1の設置部とともに上下方向に移動位置決め自在である第2の設置部とを備え、前記各設置部のそれぞれに装着された各回転部材のそれぞれを回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良装置に、請求項3に記載のロッドスタンドを用いて継ロッドを設置する継ロッド設置方法において、前記第1のスペーサが設置されている第1の支持部に第1の継ロッドを設置し、前記第2のスペーサが設置されている第2の支持部に第2の継ロッドを設置する継ロッド設置工程と、前記継ロッド設置工程で前記各支持部のそれぞれに前記各継ロッドのそれぞれが設置されている状態で、前記地盤改良装置の第1の設置部を前記第1の継ロッドの上側に配置し、この配置後に、前記第1の設置部の下端が前記第1の継ロッドの上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第1の設置部に対する前記第1の継ロッドの上端部の継手部の位置合わせを行うとともに、前記各設置部をさらに下降して、前記第1の設置部に前記第1の継ロッドの継手部を挿入し、前記第1の継ロッドを前記第1の設置部に設置する第1の継ロッド設置工程と、前記第1の継ロッド設置工程で前記第1の設置部に前記第1の継ロッドを設置した後、前記第1の支持部から前記第1のスペーサを取り除き、前記第2の設置部の下端が前記第2の継ロッドの上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第2の設置部に対する前記第2の継ロッドの上端部の継手部の位置合わせを行うとともに、前記各設置部をさらに下降して、前記第2の設置部に前記第2の継ロッドの継手部を挿入し、前記第2の継ロッドを前記第2の設置部に設置する第2の継ロッド設置工程とを有する継ロッド設置方法である。 The invention according to claim 8 comprises a first installation portion in which a first rotating member configured to include an excavation / stirring rod is installed and is movable in the vertical direction, and the first rotating member. A second rotating member having the same configuration is installed, and together with the first installation portion, a second installation portion that can be moved and positioned in the vertical direction is provided, and each of the installation portions mounted on each of the installation portions is provided with a second installation portion. A joint rod is installed using the rod stand according to claim 3 in a ground improvement device that excavates the ground by rotating and descending each of the rotating members to improve the ground by mixing and stirring the ground improvement material. In the method of installing the joint rod, the first joint rod is installed on the first support portion where the first spacer is installed, and the second support portion on which the second spacer is installed is second. In the joint rod installation step of installing the joint rod and in the state where each of the joint rods is installed in each of the support portions in the joint rod installation step, the first installation portion of the ground improvement device is installed. It is arranged above the first joint rod, and after this arrangement, each installation portion is lowered until the lower end of the first installation portion is located at the upper end of the first joint rod, and the lowering portion is lowered. Later, the joint portion of the upper end portion of the first joint rod is aligned with respect to the first installation portion, and each installation portion is further lowered to connect the first joint portion to the first installation portion. In the first joint rod installation step of inserting the joint portion of the rod and installing the first joint rod in the first installation portion, and in the first joint rod installation step, the first installation portion is described. After installing the first joint rod, the first spacer is removed from the first support portion until the lower end of the second installation portion is located at the upper end of the second joint rod. Each installation portion is lowered, and after this lowering, the joint portion of the upper end portion of the second joint rod is aligned with respect to the second installation portion, and each installation portion is further lowered to perform the second installation portion. This is a joint rod installation method including a second joint rod installation step of inserting a joint portion of the second joint rod into the installation portion of the second joint rod and installing the second joint rod in the second installation portion.

請求項9に記載の発明は、掘削・撹拌ロッドとこの掘削・撹拌ロッドに接続されている継ロッドを備えて構成されている第1の回転部材が設置され、上下方向に移動自在である第1の設置部と、前記第1の回転部材と同様に構成されている第2の回転部材が設置され、前記第1の設置部とともに上下方向に移動位置決め自在である第2の設置部とを備え、前記各設置部のそれぞれに装着された各回転部材のそれぞれを回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良装置から、請求項1〜請求項3のいずれか1項に記載のロッドスタンドを用いて前記継ロッドを取り外す継ロッド取り外し方法において、前記各設置部のそれぞれに継ロッドが設置されている状態で、前記地盤改良装置の第1の設置部を前記第1の支持部の上側に配置し、前記地盤改良装置の第2の設置部を第2の支持部の上側に配置し、この配置後に、前記第1の継ロッドの下端が前記第1の支持部の上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第1の支持部に対する前記第1の継ロッドの下端部の位置合わせを行う第1の位置合わせ工程と、前記第1の位置合わせ工程で前記第1の継ロッドの下端部の位置合わせを行った後、前記各設置部をさらに下降し、前記第1の継ロッドの下端部を前記第1の支持部に係合させる第1の係合工程と、前記第1の係合工程で前記第1の継ロッドの下端部を前記第1の支持部に係合させた後、前記第2の継ロッドの下端が前記第2の支持部の上端のところに位置するまで、前記各設置部をさらに下降し、この下降後に、前記第2の支持部に対する前記第2の継ロッドの下端部の位置合わせを行う第2の位置合わせ工程と、前記第2の位置合わせ工程で前記第2の継ロッドの下端部の位置合わせを行った後、前記各設置部をさらに下降し、前記第2の継ロッドの下端部を前記第2の支持部に係合させる第2の係合工程と、前記第2の係合工程で前記第2の継ロッドの下端部を前記第2の支持部に係合させた後、前記各継ロッドの下端が前記各支持部の下端のところに位置するまで、前記各設置部をさらに下降し、この下降後に、前記各設置部から前記各継ロッドを取り外す取り外し工程とを有する継ロッド取り外し方法である。 The invention according to claim 9, wherein a first rotating member including a drilling / stirring rod and a joint rod connected to the drilling / stirring rod is installed and is movable in the vertical direction. A first installation portion and a second installation portion on which a second rotating member having the same configuration as the first rotating member is installed and which is movable and positioned in the vertical direction together with the first installation portion. A claim from a ground improvement device that improves the ground by excavating the ground by rotating and descending each of the rotating members attached to each of the installation parts, mixing the ground improvement material, and stirring the ground. In the method of removing a joint rod by using the rod stand according to any one of 1 to 3, the ground improvement device is provided in a state where the joint rod is installed in each of the installation portions. The first installation portion of the above is arranged above the first support portion, the second installation portion of the ground improvement device is arranged above the second support portion, and after this arrangement, the first joint Each installation portion is lowered until the lower end of the rod is located at the upper end of the first support portion, and after this lowering, the lower end portion of the first joint rod is aligned with the first support portion. After aligning the lower end portion of the first joint rod in the first alignment step and the first alignment step, each installation portion is further lowered to further lower the first joint rod. In the first engagement step of engaging the lower end portion of the rod with the first support portion and in the first engagement step, the lower end portion of the first joint rod is engaged with the first support portion. After that, each of the installation portions is further lowered until the lower end of the second joint rod is located at the upper end of the second support portion, and after this lowering, the second support portion with respect to the second support portion. After aligning the lower end of the second joint rod in the second alignment step of aligning the lower end of the joint rod and the second alignment step, the lower end of the second joint rod is further adjusted. In the second engaging step of descending and engaging the lower end portion of the second joint rod with the second support portion, and in the second engaging step, the lower end portion of the second joint rod is said to be the same. After engaging with the second support portion, each installation portion is further lowered until the lower end of each joint rod is located at the lower end of each support portion, and after this lowering, from each of the installation portions. It is a joint rod removal method including a removal step of removing each joint rod.

請求項10に記載の発明は、掘削・撹拌ロッドとこの掘削・撹拌ロッドに接続されている継ロッドとで構成されている第1の回転部材が設置され、上下方向に移動自在である第1の設置部と、前記第1の回転部材と同様に構成されている第2の回転部材が設置され、前記第1の設置部とともに上下方向に移動位置決め自在である第2の設置部とを備え、前記各設置部のそれぞれに装着された各回転部材のそれぞれを回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良装置を用いた地盤改良方法において、ベッセルに格納されている複数本の継ロッドを、請求項5または請求項6に記載の吊り装置を用いて、請求項2または請求項3の記載のロッドスタンドに設置し、この設置されている各継ロッドを1本ずつ、請求項7または請求項8に記載の継ロッド設置方法で前記地盤改良装置の各設置部のそれぞれに設置する継ロッド設置工程と、前記継ロッド設置工程で継ロッドを各設置部のそれぞれに設置した後、前記各設置部のそれぞれに装着された各回転部材のそれぞれを回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良工程と、前記地盤改良工程で地盤改良をした後、前記地盤改良装置の各設置部を上昇させて前記継ロッドを前記地盤改良がされた穴から抜き、請求項9に記載の継ロッド取り外し方法で前記地盤改良装置の各設置部のそれぞれから継ロッドを取り外す取り外し工程とを有する地盤改良方法である。 In the invention according to claim 10, a first rotating member composed of an excavation / stirring rod and a joint rod connected to the excavation / stirring rod is installed and is movable in the vertical direction. And a second installation portion in which a second rotating member having the same configuration as the first rotating member is installed and is movable and positioned in the vertical direction together with the first installation portion. , Ground improvement using a ground improvement device that excavates the ground by rotating and descending each of the rotating members attached to each of the above installation parts, mixes and stirs the ground improvement material, and improves the ground. In the method, a plurality of joint rods stored in the vessel are installed on the rod stand according to claim 2 or 3 by using the suspension device according to claim 5 or 6, and this installation is performed. A joint rod installation step of installing each of the joint rods one by one in each installation portion of the ground improvement device by the joint rod installation method according to claim 7 or 8, and the joint rod installation step. After installing the joint rods in each of the installation parts, the ground is excavated by rotating and descending each of the rotating members mounted on each of the installation parts, and the ground improvement material is mixed and stirred. After the ground improvement step of improving the ground and the ground improvement step, each installation portion of the ground improvement device is raised to pull out the joint rod from the hole where the ground improvement has been performed, and claim 9. It is a ground improvement method including a removal step of removing a joint rod from each installation portion of the ground improvement device by the joint rod removing method described in the above.

本発明によれば、継ロッドの着脱を効率良く行うことができるという効果を奏する。 According to the present invention, there is an effect that the joint rod can be efficiently attached and detached.

本発明の実施形態に係る地盤改良で使用される地盤改良装置や回転部材の使用の態様を示す図であり、(b)は(a)におけるIB矢視図である。ただし、(a)と(b)では、回転駆動装置や装着部の高さ位置を変えて表示している。It is a figure which shows the mode of use of the ground improvement apparatus and the rotating member used in the ground improvement which concerns on embodiment of this invention, (b) is the IB arrow view in (a). However, in (a) and (b), the height positions of the rotary drive device and the mounting portion are changed and displayed. 本発明の実施形態に係る地盤改良で使用される回転部材を構成する継ロッドを示す図であり、(b)は(a)におけるIIB矢視図であり、(c)は(a)におけるIIC矢視図である。It is a figure which shows the joint rod which constitutes the rotating member used in the ground improvement which concerns on embodiment of this invention, (b) is the view of the IIB arrow in (a), (c) is the IIC in (a). It is an arrow view. 本発明の実施形態に係る地盤改良で使用されるベッセルとこのベッセルに継ロッドを設置した状態を示す図であり、(b)は(a)におけるIIIB−IIIB断面を示す図である。It is a figure which shows the state which the vessel used in the ground improvement which concerns on embodiment of this invention, and the joint rod is installed in this vessel, and (b) is the figure which shows the cross section of IIIB-IIIB in (a). 本発明の実施形態に係る地盤改良で使用されるロッドスタンドを示す図であり、(b)は(a)におけるIVB−IVB断面を示す図である。It is a figure which shows the rod stand used in the ground improvement which concerns on embodiment of this invention, (b) is the figure which shows the IVB-IVB cross section in (a). 本発明の実施形態に係る地盤改良で使用される吊り装置の吊り具を示す図であり、(b)は(a)におけるVB矢視図であり、(c)は(a)におけるVC矢視図である。It is a figure which shows the hanger of the hanging device used in the ground improvement which concerns on embodiment of this invention, (b) is the VB arrow view in (a), (c) is the VC arrow view in (a). It is a figure. 本発明の実施形態に係る地盤改良で使用される吊り装置のピンを示す図であり、(b)は(a)におけるVIB矢視図であり、(c)は(a)におけるVIC矢視図である。It is a figure which shows the pin of the suspension device used in the ground improvement which concerns on embodiment of this invention, (b) is the VIB arrow view in (a), (c) is the VIC arrow view in (a). Is. 本発明の実施形態に係る地盤改良方法において、継ロッドのロッドスタンドへの設置の態様を示す図である。It is a figure which shows the mode of installation of the joint rod to the rod stand in the ground improvement method which concerns on embodiment of this invention. 本発明の実施形態に係る地盤改良方法において、地盤改良装置の設置部からの継ロッドの取り外しとロッドスタンドへの設置の態様を示す図である。It is a figure which shows the mode of removing the joint rod from the installation part of the ground improvement apparatus, and installing it in a rod stand in the ground improvement method which concerns on embodiment of this invention. 本発明の実施形態に係る地盤改良方法において、ロッドスタンドからベッセルへの継ロッドの移動の態様を示す図である。It is a figure which shows the mode of movement of the joint rod from a rod stand to a vessel in the ground improvement method which concerns on embodiment of this invention. 本発明の実施形態に係る地盤改良方法において、スペーサが設置されているロッドスタンドに、継ロッドが設置されている状態を示す図であり、(b)は(a)におけるXB−XB断面を示す図である。It is a figure which shows the state which the joint rod is installed in the rod stand where the spacer is installed in the ground improvement method which concerns on embodiment of this invention, (b) shows the XB-XB cross section in (a). It is a figure. 本発明の実施形態に係る地盤改良方法で、吊り装置を継ロッドに設置する手順を示す図である。It is a figure which shows the procedure of installing a suspension device on a joint rod by the ground improvement method which concerns on embodiment of this invention. 本発明の実施形態に係る地盤改良方法で、吊り装置を継ロッドに設置する手順を示す図である。It is a figure which shows the procedure of installing a suspension device on a joint rod by the ground improvement method which concerns on embodiment of this invention. 本発明の実施形態に係る地盤改良方法で、吊り装置を継ロッドに設置する手順を示す図である。It is a figure which shows the procedure of installing a suspension device on a joint rod by the ground improvement method which concerns on embodiment of this invention. 本発明の実施形態に係る地盤改良方法で、吊り装置を継ロッドに設置する手順を示す図である。It is a figure which shows the procedure of installing a suspension device on a joint rod by the ground improvement method which concerns on embodiment of this invention.

本発明の実施形態に係る地盤改良システム1は、地盤改良装置3(図1参照)とベッセル5(図3参照)と吊り装置7(図5、図6、図13参照)とロッドスタンド9(図4、図10参照)とを備えて構成されている。 The ground improvement system 1 according to the embodiment of the present invention includes a ground improvement device 3 (see FIG. 1), a vessel 5 (see FIG. 3), a suspension device 7 (see FIGS. 5, 6, and 13), and a rod stand 9 (see FIG. 1). (See FIGS. 4 and 10).

図1に示すように、地盤改良装置(地盤改良用掘削装置)3は、従来のものと同様に、回転部材(掘削軸部材)15を回転させて下降することで、地盤GLを掘削し穴HLを形成するようになっている。 As shown in FIG. 1, the ground improvement device (excavation device for ground improvement) 3 excavates the ground GL by rotating the rotating member (excavation shaft member) 15 and descending in the same manner as the conventional one. It is designed to form HL.

回転部材15は、掘削・撹拌ロッド11とこの掘削・撹拌ロッド11の上側で掘削・撹拌ロッド11に接続されている継ロッド33とを備えて構成されている。なお、回転部材15が、掘削・撹拌ロッド11のみで構成されている場合もある。 The rotating member 15 includes an excavation / stirring rod 11 and a joint rod 33 connected to the excavation / stirring rod 11 on the upper side of the excavation / stirring rod 11. In some cases, the rotating member 15 is composed of only the excavation / stirring rod 11.

地盤改良装置3は、上記掘削した土砂に、セメントミルク等の地盤改良材を混ぜて撹拌することで、穴HL内で地盤GLを改良するようになっている。 The ground improvement device 3 is adapted to improve the ground GL in the hole HL by mixing the excavated earth and sand with a ground improvement material such as cement milk and stirring the ground improvement device 3.

また、地盤改良装置3は、地盤改良装置本体部13を備えている。地盤改良装置本体部13には、車輪16が設けられており、地盤改良装置本体部13に設けられたエンジン(図示せず)等で車輪16を駆動することにより、地盤改良装置本体部13が地盤GLの上を移動することができるようになっている。 Further, the ground improvement device 3 includes a ground improvement device main body 13. Wheels 16 are provided in the ground improvement device main body 13, and the ground improvement device main body 13 can be moved by driving the wheels 16 with an engine (not shown) or the like provided in the ground improvement device main body 13. It is possible to move on the ground GL.

地盤改良装置本体部13の上側には、補強部材17で補強された支柱19が立設されている。支柱19は、地盤改良装置本体部13に対して、上下方向に延びたた所定の軸まわりで、図示しないアクチュエータによって回動位置決め自在になっている。 A support column 19 reinforced by a reinforcing member 17 is erected on the upper side of the ground improvement device main body 13. The support column 19 is rotatable and positioned with respect to the ground improvement device main body 13 by an actuator (not shown) around a predetermined axis extending in the vertical direction.

支柱19には、回転駆動装置21が設けられている。回転駆動装置21は、図示しないアクチュエータによって、上下方向で移動位置決め自在になっている。回転駆動装置21の下部には、回転部材15を装着するための装着部(設置部)23が、複数(たとえば2つ)水平方向にならんで設けられている。各装着部23(23A,23B)のそれぞれは、これらが回転駆動装置21に設けられていることで、回転駆動装置21といっしょに上下方向で移動位置決め自在になっている。 A rotation drive device 21 is provided on the support column 19. The rotation drive device 21 can be moved and positioned in the vertical direction by an actuator (not shown). A plurality (for example, two) mounting portions (installing portions) 23 for mounting the rotating member 15 are provided in the lower portion of the rotation driving device 21 in a horizontal direction. Each of the mounting portions 23 (23A, 23B) is provided in the rotation driving device 21 so that the mounting portions 23 (23A, 23B) can be moved and positioned in the vertical direction together with the rotation driving device 21.

回転部材15を構成する掘削・撹拌ロッド11は、掘削・撹拌ロッド本体部25を備えて構成されている。掘削・撹拌ロッド本体部25は、たとえば、円筒等の筒状に形成されている。掘削・撹拌ロッド本体部25の下端部には、掘削・撹拌ロッド本体部25に対して螺旋状に傾斜した小径の傾斜板27が取付けてある。この傾斜板27の下端縁には主掘削刃として複数の掘削刃(図示せず)が設けられている。掘削・撹拌ロッド本体部25の下端面には、下端面に開口したスラリー吐出口(地盤改良材吐出口)への土等の侵入を防止するための邪魔板(図示せず)が設けられている。 The excavation / stirring rod 11 constituting the rotating member 15 includes an excavation / stirring rod main body 25. The excavation / stirring rod main body 25 is formed in a cylindrical shape such as a cylinder. At the lower end of the excavation / stirring rod main body 25, a small-diameter inclined plate 27 that is spirally inclined with respect to the excavation / stirring rod main body 25 is attached. A plurality of excavation blades (not shown) are provided as main excavation blades on the lower end edge of the inclined plate 27. On the lower end surface of the excavation / stirring rod main body 25, a baffle plate (not shown) for preventing soil or the like from entering the slurry discharge port (ground improvement material discharge port) opened at the lower end surface is provided. There is.

上記主掘削刃より僅か上方位置には、主掘削刃によって掘削された小径の掘削穴を拡大する大径の拡大掘削刃(図示せず)が設けられている。より詳細には、上記主掘削刃より僅か上方位置には、傾斜板27と同方向に傾斜したブレード板29が設けてあり、このブレード板29の先端付近には複数の上記拡大掘削刃が取付けられている。 A large-diameter enlarged excavation blade (not shown) that enlarges a small-diameter excavation hole excavated by the main excavation blade is provided at a position slightly above the main excavation blade. More specifically, a blade plate 29 inclined in the same direction as the inclined plate 27 is provided at a position slightly above the main excavation blade, and a plurality of the enlarged excavation blades are attached near the tip of the blade plate 29. Has been done.

また、上記主掘削刃及び拡大掘削刃によって掘削された掘削土を撹拌するために、掘削・撹拌ロッド本体部25には、ブレード板29と同方向に傾斜している複数の撹拌翼31が、ブレード板29の上で適宜の間隔でかつ水平に設けられている。 Further, in order to stir the excavated soil excavated by the main excavation blade and the expansion excavation blade, the excavation / stirring rod main body 25 is provided with a plurality of stirring blades 31 inclined in the same direction as the blade plate 29. It is provided horizontally on the blade plate 29 at appropriate intervals.

回転部材15を構成する継ロッド33は、図2で示すように、継ロッド本体部35とオス継手部37とメス継手部39とを備えて構成されている。 As shown in FIG. 2, the joint rod 33 constituting the rotating member 15 includes a joint rod main body portion 35, a male joint portion 37, and a female joint portion 39.

継ロッド本体部35は、掘削・撹拌ロッド本体部25と同様にして、たとえば、円筒等の筒状に形成されている。オス継手部37は、たとえば、正六角柱状に形成されているが、継ロッド本体部35が筒状に形成されていることで、中央に円柱状の貫通孔41が形成されている。 The joint rod main body 35 is formed in a tubular shape such as a cylinder in the same manner as the excavation / stirring rod main body 25. For example, the male joint portion 37 is formed in a regular hexagonal columnar shape, but the joint rod main body portion 35 is formed in a tubular shape, so that a columnar through hole 41 is formed in the center.

オス継手部37は、継ロッド本体部35の長手方向の一端(上端)から突出しており、継ロッド本体部35の中心軸とオス継手部37の中心軸とはお互いが一致している。オス継手部37の六角の外径は、継ロッド本体部35の外径よりも小さくなっている。これにより、継ロッド本体部35とオス継手部37との境界には、段差部43が形成されている。 The male joint portion 37 protrudes from one end (upper end) of the joint rod main body 35 in the longitudinal direction, and the central axis of the joint rod main body 35 and the central axis of the male joint 37 coincide with each other. The hexagonal outer diameter of the male joint portion 37 is smaller than the outer diameter of the joint rod main body portion 35. As a result, a step portion 43 is formed at the boundary between the joint rod main body portion 35 and the male joint portion 37.

オス継手部37の正六角柱の高さ寸法は、継ロッド本体部35の円筒の高さ寸法に比べて十分に小さくなっている。また、オス継手部37の外周部には、切り欠き49が一対で設けられている。切り欠き49には、継ロッド33を他の継ロッド(図2に二点鎖線で示す継ロッド)33に一体的に接続し、また、継ロッド33を地盤改良装置3の回転駆動装置21の装着部23に一体的に設置したときに、この接続状態・設置状態を維持するためのピン(図示せず)が係合するようになっている。 The height dimension of the regular hexagonal prism of the male joint portion 37 is sufficiently smaller than the height dimension of the cylinder of the joint rod main body portion 35. Further, a pair of notches 49 are provided on the outer peripheral portion of the male joint portion 37. The joint rod 33 is integrally connected to another joint rod (the joint rod shown by the alternate long and short dash line in FIG. 2) 33 to the notch 49, and the joint rod 33 is connected to the rotary drive device 21 of the ground improvement device 3. When integrally installed on the mounting portion 23, a pin (not shown) for maintaining this connected state / installed state is engaged.

メス継手部39は、継ロッド本体部35の長手方向の他端部(下端部)に設けられている。メス継手部39は、たとえば、正六角柱状に形成されている凹部で形成されている。継ロッド本体部35の中心軸とメス継手部39の中心軸とはお互いが一致している。メス継手部39の正六角柱の内径は、オス継手部37の六角の外径よりもごく僅かに大きくなっており、メス継手部39の正六角柱の高さ寸法の値は、オス継手部37の正六角柱の高さ寸法の値よりも僅かに大きくなっている。 The female joint portion 39 is provided at the other end (lower end) of the joint rod main body 35 in the longitudinal direction. The female joint portion 39 is formed of, for example, a recess formed in a regular hexagonal columnar shape. The central axis of the joint rod main body 35 and the central axis of the female joint 39 coincide with each other. The inner diameter of the regular hexagonal prism of the female joint 39 is slightly larger than the outer diameter of the hexagon of the male joint 37, and the value of the height dimension of the regular hexagonal prism of the female joint 39 is that of the male joint 37. It is slightly larger than the value of the height dimension of the regular hexagonal prism.

メス継手部39が形成されている継ロッド本体部35の部位には、継ロッド33を他の継ロッド(図2では図示せず)や掘削・撹拌ロッド11に一体的に接続しこの接続状態を維持するためのピン(図示せず)が係合する貫通孔47が一対で設けられている。これらの貫通孔47の一部は、メス継手部39の六角柱状の凹部(メス継手部39を構成している凹部)にかかっている(通過している)。 The joint rod 33 is integrally connected to another joint rod (not shown in FIG. 2) or the excavation / stirring rod 11 at the portion of the joint rod main body 35 where the female joint portion 39 is formed, and this connection state is established. A pair of through holes 47 are provided with which pins (not shown) are engaged with each other. A part of these through holes 47 extends (passes through) a hexagonal columnar recess (recess that constitutes the female joint 39) of the female joint 39.

ここで、2つの継ロッド33をこの長手方向でお互いに接続する態様について説明する。まず、継ロッド33のオス継手部37を他の継ロッド(図2に二点鎖線で示す継ロッド)33のメス継手部39に挿入する。この挿入がされている状態では、継ロッド33の段差部43が、他の継ロッド(図2に二点鎖線で示す継ロッド)33の他端(下端)に当接しており、各継ロッド33の中心軸がお互いに一致しており、ピン(図示せず)を通すためのたとえば円柱状の2つの貫通孔が、メス継手部39の貫通孔47とオス継手部37の切り欠き49とによって形成されている。 Here, a mode in which the two joint rods 33 are connected to each other in this longitudinal direction will be described. First, the male joint portion 37 of the joint rod 33 is inserted into the female joint portion 39 of the other joint rod (joint rod shown by the alternate long and short dash line in FIG. 2) 33. In this inserted state, the stepped portion 43 of the joint rod 33 is in contact with the other end (lower end) of the other joint rod (joint rod shown by the alternate long and short dash line in FIG. 2) 33, and each joint rod The central axes of 33 are aligned with each other, and two, for example, columnar through holes for passing pins (not shown) are the through hole 47 of the female joint 39 and the notch 49 of the male joint 37. Is formed by.

この状態で、2つの貫通孔のそれぞれにピン(図示せず)を挿入することとで、各継ロッド33が一体化されるようになっている。 In this state, by inserting a pin (not shown) into each of the two through holes, each joint rod 33 is integrated.

掘削・撹拌ロッド本体部25の上端にも、継ロッド33のオス継手部37と同様なオス継手部が形成されており、継ロッド33同士の接続と同様にピン(図示せず)を用いて掘削・撹拌ロッド11の上側に継ロッド33が一体的に設けられるようになっている。 A male joint portion similar to the male joint portion 37 of the joint rod 33 is also formed at the upper end of the excavation / stirring rod main body 25, and a pin (not shown) is used in the same manner as the connection between the joint rods 33. A joint rod 33 is integrally provided on the upper side of the excavation / stirring rod 11.

そして、掘削・撹拌ロッド11の上側に継ロッド33を1本もしくは複数本継ぎ足すことで、回転部材15の長さ(高さ)を延長することができる。 Then, the length (height) of the rotating member 15 can be extended by adding one or a plurality of joint rods 33 to the upper side of the excavation / stirring rod 11.

地盤改良装置3の回転駆動装置21の装着部23の下端にも、継ロッド33のメス継手部39と同様なメス継手部が形成されており、継ロッド33同士の接続と同様にピン(図示せず)を用いて継ロッド33や掘削・撹拌ロッド11(回転部材15)を装着部23に設置(装着)することができるようになっている。 A female joint portion similar to the female joint portion 39 of the joint rod 33 is also formed at the lower end of the mounting portion 23 of the rotary drive device 21 of the ground improvement device 3, and a pin (FIG. 6) is formed in the same manner as the connection between the joint rods 33. The joint rod 33 and the excavation / stirring rod 11 (rotating member 15) can be installed (mounted) on the mounting portion 23 by using (not shown).

回転部材15(掘削・撹拌ロッド11や継ロッド33)は、地盤改良装置3の回転駆動装置21の装着部23から垂下するようにして、回転駆動装置21(装着部23)に装着されるようになっている。 The rotary member 15 (excavation / stirring rod 11 and joint rod 33) is mounted on the rotary drive device 21 (mounting section 23) so as to hang down from the mounting portion 23 of the rotary drive device 21 of the ground improvement device 3. It has become.

装着部23に装着された回転部材15は、中心軸を回転中心にして、回転駆動装置21に設けられたアクチュエータ(図示せず)で回転すると共に、回転部材15(掘削・撹拌ロッド11)の先端部(下端部)からは、地盤を硬くするためのスラリーが吐出するようになっている。なお、スラリーは、回転駆動装置21を介して図示しないスラリー供給装置から供給され、回転部材15の内部(貫通孔41等)を通るようになっている。 The rotating member 15 mounted on the mounting portion 23 is rotated by an actuator (not shown) provided in the rotation driving device 21 with the central axis as the center of rotation, and the rotating member 15 (excavation / stirring rod 11). A slurry for hardening the ground is discharged from the tip (lower end). The slurry is supplied from a slurry supply device (not shown) via a rotation drive device 21 and passes through the inside of the rotation member 15 (through hole 41 or the like).

また、回転駆動装置21に装着部23が2つ設けられているので、各装着部23(23A,23B)のそれぞれに、掘削・撹拌ロッド11(11A,11B)や継ロッド33(33A,33B)で構成されている回転部材15(15A,15B)が装着されるようになっている。 Further, since the rotary drive device 21 is provided with two mounting portions 23, the excavation / stirring rod 11 (11A, 11B) and the joint rod 33 (33A, 33B) are provided in each of the mounting portions 23 (23A, 23B). ) Is attached to the rotating member 15 (15A, 15B).

装着部23(23A,23B)のそれぞれに装着された各回転部材15(15A,15B)は、お互いが近接しており、各回転部材15(15A,15B)の中心軸のそれぞれはお互いが平行になって上下方向に延伸している。 The rotating members 15 (15A, 15B) mounted on the mounting portions 23 (23A, 23B) are close to each other, and the central axes of the rotating members 15 (15A, 15B) are parallel to each other. And stretches in the vertical direction.

また、各装着部23(23A,23B)のそれぞれに装着された2つの回転部材15(15A,15B)で地盤GLを掘削することで得られる穴HLを平面視すると、たとえばだるま穴状になっている。 Further, when the hole HL obtained by excavating the ground GL with the two rotating members 15 (15A, 15B) mounted on each of the mounting portions 23 (23A, 23B) is viewed in a plan view, it becomes, for example, a Daruma hole shape. ing.

次に、継ロッド33を複数本格納するベッセル5について、図3を参照しつつ説明する。 Next, the vessel 5 for storing a plurality of joint rods 33 will be described with reference to FIG.

ベッセル5は、たとえば矩形な枡状に形成されている。ただし、1つの側壁55が斜めになっている。 The vessel 5 is formed, for example, in the shape of a rectangular box. However, one side wall 55 is slanted.

継ロッド33は、オス継手部37側の端部が1つの側壁55の上に載り、メス継手部39側の端部が1つの側壁55とは反対側の側壁部57と底壁部59とに当接するようにして、斜めに延びてベッセル5に収容されるようになっている。収容がされている状態を平面視すると、継ロッド33のオス継手部37が、ベッセル5の外側に位置している。また、ベッセル5に収容されている複数本の継ロッド33の中心軸は、お互いが平行になっている。 In the joint rod 33, the end portion on the male joint portion 37 side rests on one side wall 55, and the end portion on the female joint portion 39 side is the side wall portion 57 and the bottom wall portion 59 on the side opposite to the one side wall 55. It extends diagonally so as to be in contact with the vessel 5 and is accommodated in the vessel 5. Looking at the housed state in a plan view, the male joint portion 37 of the joint rod 33 is located outside the vessel 5. Further, the central axes of the plurality of joint rods 33 housed in the vessel 5 are parallel to each other.

なお、ベッセル5内に、水WTをはっておくことで、継ロッド33の洗浄をすることができる。 The joint rod 33 can be washed by putting water WT in the vessel 5.

次に、ロッドスタンド9について、図4、図10を参照しつつ詳しく説明する。ロッドスタンド9は、第1の支持部(第1の筒状部)61と第2の支持部(第2の筒状部)63とを備えて構成されている。 Next, the rod stand 9 will be described in detail with reference to FIGS. 4 and 10. The rod stand 9 is configured to include a first support portion (first tubular portion) 61 and a second support portion (second tubular portion) 63.

第1の支持部61は、たとえば、円筒状等の筒状に形成されており、第2の支持部63も円筒状等の筒状に形成されている。 The first support portion 61 is formed in a cylindrical shape such as a cylindrical shape, and the second support portion 63 is also formed in a cylindrical shape such as a cylindrical shape.

第1の筒状部61は、地盤改良に用いる第1の継ロッド33Aの下端部に係合することで(たとえば、第1の継ロッド33Aの下端部を内部に収容することで)、第1の継ロッド33Aを起立させた状態で支持するようになっている。第1の筒状部61に支持されている第1の継ロッド33Aの長手方向(中心軸の延伸方向)は上下方向になっている。 The first tubular portion 61 is engaged with the lower end portion of the first joint rod 33A used for ground improvement (for example, by accommodating the lower end portion of the first joint rod 33A inside). The joint rod 33A of No. 1 is supported in an upright state. The longitudinal direction (extending direction of the central axis) of the first joint rod 33A supported by the first tubular portion 61 is the vertical direction.

第2の筒状部63は、第1の筒状部61と一体化しており、地盤改良に用いる第2の継ロッド33Bの下端部に係合することで(たとえば、第2の継ロッド33Bの下端部を内部に収容することで)、第2の継ロッド33Bを起立させた状態で支持するようになっている。この支持状態では、第2の継ロッド33Bに係合する部位の上端が、第1の継ロッド33Aと第1の筒状部61とがお互いに係合する部位の上端よりも下方に位置している。 The second tubular portion 63 is integrated with the first tubular portion 61, and by engaging with the lower end portion of the second joint rod 33B used for ground improvement (for example, the second joint rod 33B). (By accommodating the lower end portion of the rod inside), the second joint rod 33B is supported in an upright state. In this support state, the upper end of the portion that engages with the second joint rod 33B is located below the upper end of the portion where the first joint rod 33A and the first tubular portion 61 engage with each other. ing.

さらに説明すると、第1の筒状部61と第2の筒状部63とは、これらの内径が、お互いに等しくなっていて、各継ロッド33の外径よりも僅かに大きくなっている。また、第1の筒状部61と第2の筒状部63とは、これらの外径も、お互いに等しくなっている。ただし、第2の筒状部63の高さ寸法(上下方向の寸法)の値は、第1の筒状部61の高さ寸法の値よりも小さくなっている。 Further explaining, the inner diameters of the first tubular portion 61 and the second tubular portion 63 are equal to each other, and are slightly larger than the outer diameter of each joint rod 33. Further, the outer diameters of the first tubular portion 61 and the second tubular portion 63 are also equal to each other. However, the value of the height dimension (dimension in the vertical direction) of the second tubular portion 63 is smaller than the value of the height dimension of the first tubular portion 61.

たとえば、第2の筒状部63の高さ寸法の値は、継ロッド33(継ロッド本体部35)の外径の1倍から3倍程度(たとえば、2倍程度)になっており、第1の筒状部61の高さ寸法の値は、第2の筒状部63の高さ寸法の値の1.5倍〜3倍程度(たとえば、2倍程度)になっている。 For example, the value of the height dimension of the second tubular portion 63 is about 1 to 3 times (for example, about 2 times) the outer diameter of the joint rod 33 (joint rod main body 35). The value of the height dimension of the tubular portion 61 of 1 is about 1.5 to 3 times (for example, about 2 times) the value of the height dimension of the second tubular portion 63.

また、第1の筒状部61と第2の筒状部63とは、たとえば平板状に形成されているベース体65を介して、お互いが一体化している。 Further, the first tubular portion 61 and the second tubular portion 63 are integrated with each other via, for example, a base body 65 formed in a flat plate shape.

すなわち、ベース体65の上面(ほぼ水平な平面)の所定の位置に、第1の筒状部61が一体的に設けられており、ベース体65の上面の、第1の筒状部61から離れた所定の位置に、第2の筒状部63が一体的に設けられている。 That is, the first tubular portion 61 is integrally provided at a predetermined position on the upper surface (almost horizontal flat surface) of the base body 65, and from the first tubular portion 61 on the upper surface of the base body 65. A second tubular portion 63 is integrally provided at a predetermined position apart from each other.

各筒状部61,63は、これらの中心軸が上下方向に延伸しており、上下方向で、各筒状部61,63の下端の位置はお互いが一致しているが、第2の筒状部63の上端は、第2の筒状部63の上端よりも下方に位置している。 The central axes of the tubular portions 61 and 63 extend in the vertical direction, and the positions of the lower ends of the tubular portions 61 and 63 coincide with each other in the vertical direction, but the second cylinder The upper end of the shaped portion 63 is located below the upper end of the second tubular portion 63.

これにより、上述したように、各継ロッドの33(33A,33B)それぞれが各筒状部61,63のそれぞれに設置されて支持されている状態では、第2の継ロッド33Bと第2の支持部63とがお互いに係合している部位の上端が、第1の継ロッド33Aと第1の支持部61とがお互いに係合している部位の上端よりも下方に位置している。 As a result, as described above, in a state where 33 (33A, 33B) of each joint rod is installed and supported in each of the tubular portions 61, 63, the second joint rod 33B and the second joint rod 33B The upper end of the portion where the support portion 63 is engaged with each other is located below the upper end of the portion where the first joint rod 33A and the first support portion 61 are engaged with each other. ..

また、ベース体65の、各筒状部61,63の内部に臨んでいる部位には、水抜用の貫通孔67が形成されていることで、ベース体65の一部によって、たとえば「X」字状の当接部69が形成されている。 Further, a through hole 67 for draining water is formed in a portion of the base body 65 facing the inside of each of the tubular portions 61 and 63, so that a part of the base body 65, for example, "X" A character-shaped contact portion 69 is formed.

第1の筒状部61に第1の継ロッド33Aが設置されて支持されている状態では、第1の継ロッド33Aの下端部が、第1の筒状部61の内部に入り込み、第1の継ロッド33Aの下端が、第1の筒状部61の「X」字状の当接部69に当接し、第1の継ロッド33Aの中心軸が上下方向に延伸している。 In a state where the first joint rod 33A is installed and supported by the first tubular portion 61, the lower end portion of the first joint rod 33A enters the inside of the first tubular portion 61, and the first The lower end of the joint rod 33A is in contact with the "X" -shaped contact portion 69 of the first tubular portion 61, and the central axis of the first joint rod 33A extends in the vertical direction.

第2の筒状部63に第2の継ロッド33Bが設置されて支持されている状態では、第2の継ロッド33Bの下端部が、第2の筒状部63の内部に入り込み、第2の継ロッド33Bの下端が、第2の筒状部63の「X」字状の当接部69に当接し、第2の継ロッド33Bの中心軸が上下方向に延伸している。 In a state where the second joint rod 33B is installed and supported by the second tubular portion 63, the lower end portion of the second joint rod 33B enters the inside of the second tubular portion 63 and is second. The lower end of the joint rod 33B is in contact with the "X" -shaped contact portion 69 of the second tubular portion 63, and the central axis of the second joint rod 33B extends in the vertical direction.

また、各継ロッド33(33A,33B)のそれぞれが各筒状部61,63のそれぞれに設置されて支持されている状態では、上下方向で、各継ロッド33(33A,33B)の下端の位置がお互いに一致しており、各継ロッド33(33A,33B)の上端の位置がお互いに一致している。なお、この場合には、後述するスペーサ71,75(図7(c)も併せて参照)が設置されていないものとする。 Further, in a state where each of the joint rods 33 (33A, 33B) is installed and supported in each of the tubular portions 61, 63, in the vertical direction, the lower end of each joint rod 33 (33A, 33B) The positions are aligned with each other, and the positions of the upper ends of the joint rods 33 (33A, 33B) are aligned with each other. In this case, it is assumed that the spacers 71 and 75 (see also FIG. 7C), which will be described later, are not installed.

各筒状部61,63のピッチ(横方向における各筒状部61,63の中心軸間の距離の値)は、たとえば、地盤改良装置3の回転駆動装置21の各装着部23(23A,23B)のピッチ(横方向における各装着部23の中心軸間の距離の値)と等しくなっている。 The pitch of the tubular portions 61, 63 (the value of the distance between the central axes of the tubular portions 61, 63 in the lateral direction) is, for example, the mounting portion 23 (23A, 23A, of the rotation drive device 21 of the ground improvement device 3). 23B) is equal to the pitch (the value of the distance between the central axes of each mounting portion 23 in the lateral direction).

第1の筒状部61には、第1の継ロッド33Aを起立させ支持した状態で、第1の継ロッド33Aを嵩上げするための第1のスペーサ71(図4、図7(c)、図10参照)を設置する第1のスペーサ設置部73が設けられている。 A first spacer 71 for raising the first joint rod 33A in a state where the first joint rod 33A is erected and supported on the first tubular portion 61 (FIGS. 4, 7 (c), A first spacer installation portion 73 for installing (see FIG. 10) is provided.

第2の筒状部63には、第2の継ロッド33Bを起立させ支持した状態で、第2の継ロッド33Bを、第1の継ロッド33Aよりも少ない量だけ嵩上げするための第2のスペーサ75(図4、図7(c)、図10参照)を設置する第2のスペーサ設置部77が設けられている。 A second for raising the second joint rod 33B by a smaller amount than the first joint rod 33A in a state where the second joint rod 33B is erected and supported on the second tubular portion 63. A second spacer installation portion 77 for installing the spacer 75 (see FIGS. 4, 7 (c) and 10) is provided.

第1のスペーサ設置部73は、たとえば、第1の筒状部61をこの径方向で貫通する第1の貫通孔で形成されている。第1の貫通孔73は第1の筒状部61の下端部に形成されている。 The first spacer installation portion 73 is formed, for example, by a first through hole that penetrates the first tubular portion 61 in this radial direction. The first through hole 73 is formed at the lower end of the first tubular portion 61.

さらに説明すると、側面視において、第1の貫通孔73は、たとえば、正方形状等の矩形状に形成されており、矩形の中心を、第1の筒状部61の中心軸が通っている。また、側面視において、第1の貫通孔73は、矩形の4つの辺(下辺、上辺、一対の側辺)のうちの下辺が第1の筒状部61の下端(ベース体65の上面)に重なっており、上辺と下辺との間の寸法が、第1の貫通孔73の高さ寸法になっており、一対の側辺の間の寸法(たとえば、高さ寸法と等しい寸法)が、第1の貫通孔73の幅寸法になっている。 More specifically, in the side view, the first through hole 73 is formed in a rectangular shape such as a square shape, and the central axis of the first tubular portion 61 passes through the center of the rectangle. Further, in the side view, the lower side of the four rectangular sides (lower side, upper side, and pair of side sides) of the first through hole 73 is the lower end of the first tubular portion 61 (upper surface of the base body 65). The dimension between the upper side and the lower side is the height dimension of the first through hole 73, and the dimension between the pair of side sides (for example, the dimension equal to the height dimension) is It has the width dimension of the first through hole 73.

第1の貫通孔73は、すでに理解されるように、第1の筒状部の2箇所に形成されており、平面視において、2つの第1の貫通孔(一対の第1の貫通孔)73は、第1の筒状部61の中心軸に対して点対称の位置に配置されている。 As already understood, the first through holes 73 are formed at two positions in the first tubular portion, and in a plan view, the first through holes 73 (a pair of first through holes). The 73 is arranged at a position symmetrical with respect to the central axis of the first tubular portion 61.

第1のスペーサ71は、木材等の軽量の材料で、たとえば、細長い四角柱状に形成されている。第1のスペーサ71の底面や上面(長手方向の両端面)は、たとえば、正方形状等の矩形状に形成されている。第1のスペーサ71の四角柱の底面や上面の縦寸法や横寸法の値は、第1の貫通孔73の高さ寸法や幅寸法の値よりも僅かに小さくなっており、第1のスペーサ71の長さ寸法(四角柱の高さ寸法)は、第1の筒状部61の外径よりも大きくなっている(たとえば3倍〜10倍程度になっている)。 The first spacer 71 is a lightweight material such as wood, and is formed in an elongated square columnar shape, for example. The bottom surface and the upper surface (both end faces in the longitudinal direction) of the first spacer 71 are formed in a rectangular shape such as a square shape. The values of the vertical and horizontal dimensions of the bottom surface and the top surface of the square pillar of the first spacer 71 are slightly smaller than the values of the height dimension and the width dimension of the first through hole 73, and the first spacer The length dimension of 71 (height dimension of a quadrangular prism) is larger than the outer diameter of the first tubular portion 61 (for example, it is about 3 to 10 times larger).

そして、第1のスペーサ71が第1のスペーサ設置部73に設置されている状態では、第1のスペーサ71が、一対の第1の貫通孔73を貫通している。第1のスペーサ71が第1のスペーサ設置部73に設置されている状態で、第1の筒状部61に第1の継ロッド33Aが設置されると、第1の継ロッド33Aの下端が第1のスペーサ71に当接し、第1のスペーサ71の四角柱の底面や上面の縦寸法(第1の貫通孔73の高さ寸法よりも僅かに小さい寸法)だけ、第1のスペーサ71を用いない場合に比べ、第1の継ロッド33Aが嵩上げされた状態になる。 Then, in a state where the first spacer 71 is installed in the first spacer installation portion 73, the first spacer 71 penetrates the pair of first through holes 73. When the first joint rod 33A is installed in the first tubular portion 61 while the first spacer 71 is installed in the first spacer installation portion 73, the lower end of the first joint rod 33A becomes The first spacer 71 is brought into contact with the first spacer 71 by the vertical dimension of the bottom surface and the upper surface of the square pillar of the first spacer 71 (a dimension slightly smaller than the height dimension of the first through hole 73). Compared with the case where it is not used, the first joint rod 33A is in a raised state.

第2のスペーサ設置部77も、たとえば、第2の筒状部63をこの径方向で貫通している第2の貫通孔77で形成されている。第2の貫通孔77も第2の筒状部63の下端部に形成されている。 The second spacer installation portion 77 is also formed of, for example, a second through hole 77 that penetrates the second tubular portion 63 in this radial direction. The second through hole 77 is also formed at the lower end of the second tubular portion 63.

さらに説明すると、側面視において、第2の貫通孔77も、たとえば、正方形状等の矩形状に形成されており、矩形の中心を、第2の筒状部63の中心軸が通っている。また、側面視において、第2の貫通孔77も、矩形の4つの辺(下辺、上辺、一対の側辺)のうちの下辺が第2の筒状部63の下端に重なっており、上辺と下辺との間の寸法が、第2の貫通孔77の高さ寸法になっている。 More specifically, in the side view, the second through hole 77 is also formed in a rectangular shape such as a square shape, and the central axis of the second tubular portion 63 passes through the center of the rectangle. Further, in the side view, the lower side of the four sides (lower side, upper side, and pair of side sides) of the rectangle of the second through hole 77 also overlaps the lower end of the second tubular portion 63, and is aligned with the upper side. The dimension between the lower side and the lower side is the height dimension of the second through hole 77.

ただし、第2の貫通孔77の高さ寸法や幅寸法は、第1の貫通孔73の高さ寸法や幅寸法よりも小さくなっている。 However, the height dimension and the width dimension of the second through hole 77 are smaller than the height dimension and the width dimension of the first through hole 73.

第2の貫通孔77も、既に理解されるように、第2の筒状部63の2箇所に形成されており、平面視において、2つの第2の貫通孔(一対の第2の貫通孔)77も、第2の筒状部63の中心軸に対して点対称の位置に配置されている。 The second through hole 77 is also formed at two positions of the second tubular portion 63, as already understood, and in a plan view, the two second through holes (a pair of second through holes) are also formed. ) 77 is also arranged at a position symmetrical with respect to the central axis of the second tubular portion 63.

第2のスペーサ75も、木材等の軽量の材料で、たとえば、細長い柱状に形成されている。第2のスペーサ75の底面や上面も、たとえば、正方形状等の矩形状に形成されている。第2のスペーサ75の四角柱の底面や上面の縦寸法や横寸法の値も、第2の貫通孔77の高さ寸法や幅寸法の値よりも僅かに小さくなっており、第2のスペーサ75の長さ寸法(四角柱の高さ寸法)も、第2の筒状部63の外径よりも大きくなっている。 The second spacer 75 is also made of a lightweight material such as wood, and is formed in an elongated columnar shape, for example. The bottom surface and the upper surface of the second spacer 75 are also formed in a rectangular shape such as a square shape. The vertical and horizontal dimensions of the bottom and top surfaces of the square pillar of the second spacer 75 are also slightly smaller than the height and width dimensions of the second through hole 77, and the second spacer The length dimension of the 75 (height dimension of the quadrangular prism) is also larger than the outer diameter of the second tubular portion 63.

そして、第2のスペーサ75が第2のスペーサ設置部77に設置されている状態でも、第2のスペーサ75が、一対の第2の貫通孔77を貫通している。第2のスペーサ75が第2のスペーサ設置部77に設置されている状態で、第2の筒状部63に第2の継ロッド33Bが設置されると、第1のスペーサ71の場合と同様にして、第2の継ロッド33Bの下端が第2のスペーサ75に当接し、第2のスペーサ75の四角柱の底面や上面の縦寸法だけ、第2のスペーサ75を用いない場合に比べ、第2の継ロッド33Bが嵩上げされた状態になる。 Then, even when the second spacer 75 is installed in the second spacer installation portion 77, the second spacer 75 penetrates the pair of second through holes 77. When the second joint rod 33B is installed in the second tubular portion 63 while the second spacer 75 is installed in the second spacer installation portion 77, it is the same as in the case of the first spacer 71. Then, the lower end of the second joint rod 33B abuts on the second spacer 75, and only the vertical dimensions of the bottom surface and the upper surface of the square pillar of the second spacer 75 are compared with the case where the second spacer 75 is not used. The second joint rod 33B is in a raised state.

ただし、第2のスペーサ75の四角柱の底面や上面の縦寸法の値が、第1のスペーサ71の四角柱の底面や上面の縦寸法の値よりも小さい分だけ、第2の継ロッド33Bの嵩上げ量が、第1の継ロッド33Aの嵩上げ量よりも少なくなっている。 However, the value of the vertical dimension of the bottom surface and the upper surface of the square pillar of the second spacer 75 is smaller than the value of the vertical dimension of the bottom surface and the upper surface of the square pillar of the first spacer 71, so that the second joint rod 33B The amount of raising of the first joint rod 33A is smaller than the amount of raising of the first joint rod 33A.

なお、第1の継ロッド33Aの嵩上げ量と第2の継ロッド33Bの嵩上げ量との差の値は、たてえば、オス継手部37の高さ寸法の値よりも僅かに大きくなっている。 The value of the difference between the raised amount of the first joint rod 33A and the raised amount of the second joint rod 33B is slightly larger than the value of the height dimension of the male joint portion 37. ..

次に、吊り装置7について、図5、図6を参照して詳しく説明する。 Next, the suspension device 7 will be described in detail with reference to FIGS. 5 and 6.

吊り装置7は、継ロッド33や掘削・撹拌ロッド11をクレーン79(図7等参照)で吊るために、継ロッド33の上端部に形成されている継手部(たとえば、オス継手部)37に設置される装置であり、ピン45(図6参照)と吊り具81(図5参照)とを備えて構成されている。 The suspension device 7 is attached to a joint portion (for example, a male joint portion) 37 formed at the upper end portion of the joint rod 33 in order to suspend the joint rod 33 and the excavation / stirring rod 11 with a crane 79 (see FIG. 7 and the like). It is a device to be installed, and is configured to include a pin 45 (see FIG. 6) and a hanging tool 81 (see FIG. 5).

ピン45は、円筒状もしくは円柱状に形成されたピン本体部83と、このピン本体部83の長手方向の一方の端に設けられた鍔部85と、この鍔部85に形成された切り欠き87とを備えて構成されている。 The pin 45 has a pin body 83 formed in a cylindrical or columnar shape, a collar 85 provided at one end of the pin body 83 in the longitudinal direction, and a notch formed in the collar 85. It is configured to include 87.

また、ピン45には、ハンドル部89が設けられている。このハンドル部89は、棒状に形成されており、切り欠き87が設けられていない箇所で鍔部85の外周からピン本体部83の長手方向に対して直交する方向に延びている。 Further, the pin 45 is provided with a handle portion 89. The handle portion 89 is formed in a rod shape, and extends from the outer periphery of the flange portion 85 in a direction orthogonal to the longitudinal direction of the pin main body portion 83 at a portion where the notch 87 is not provided.

鍔部85は、たとえば、円板状に形成されており、鍔部85の外径はピン本体部83の外径よりも大きくなっている。また、鍔部85の中心軸とピン本体部83の中心軸とはお互いが一致している。切り欠き87は、たとえば、矩形状に形成されており、鍔部85の厚さ方向で鍔部85を貫通している。 The collar portion 85 is formed in a disk shape, for example, and the outer diameter of the collar portion 85 is larger than the outer diameter of the pin main body portion 83. Further, the central axis of the flange portion 85 and the central axis of the pin body portion 83 coincide with each other. The notch 87 is formed in a rectangular shape, for example, and penetrates the collar portion 85 in the thickness direction of the collar portion 85.

吊り具81は、たとえば直方体状に形成された吊り具本体部91を備えて構成されている。吊り具本体部91には、継手用貫通孔93とピン用貫通孔95と「L」字状の係止部(抜け止め用引っ掛け部)97とロープ係合部99とが設けられている。 The hanger 81 is configured to include, for example, a hanger main body 91 formed in a rectangular parallelepiped shape. The hanger main body 91 is provided with a through hole 93 for a joint, a through hole 95 for a pin, an “L” -shaped locking portion (hooking portion for retaining) 97, and a rope engaging portion 99.

六角柱状に形成されている継手用貫通孔93には、地盤改良に用いられる回転部材(継ロッド33や掘削・撹拌ロッド11)のオス継手部37が挿入されるようになっている(図13参照)。 The male joint portion 37 of the rotating member (joint rod 33 and excavation / stirring rod 11) used for ground improvement is inserted into the joint through hole 93 formed in a hexagonal columnar shape (FIG. 13). reference).

ピン用貫通孔95には、ピン本体部83の中心軸を回動中心にして回動自在なようにピン45のピン本体部83が挿入されるようになっている。また、ピン用貫通孔95の一部が継手用貫通孔93を通過している。 The pin body 83 of the pin 45 is inserted into the pin through hole 95 so as to be rotatable around the central axis of the pin body 83. Further, a part of the through hole 95 for the pin passes through the through hole 93 for the joint.

ロープ係合部99には、吊り装置7が設置された継ロッド33等の吊り上げのためにワイヤロープ等のロープが掛けられるようになっている(図7等参照)。 A rope such as a wire rope is hung on the rope engaging portion 99 for lifting the joint rod 33 or the like on which the lifting device 7 is installed (see FIG. 7 and the like).

また、吊り装置7では、ピン本体部83をピン用貫通孔95に挿入するときには、ピン45の切り欠き87を係止部97が通過することで、鍔部85と係止部97とがお互いに非干渉状態になる(図13参照)。また、ピン本体部83をピン用貫通孔95に挿入し終えた状態でピン45(ピン本体部83)を回動することで、切り欠き87も回動して位置を変え、係止部97の先端部と鍔部85とがお互いに干渉してピン45の抜け止めがされるように構成されている(図14参照)。 Further, in the suspension device 7, when the pin body portion 83 is inserted into the pin through hole 95, the locking portion 97 passes through the notch 87 of the pin 45, so that the collar portion 85 and the locking portion 97 are mutually connected. Is in a non-interfering state (see FIG. 13). Further, by rotating the pin 45 (pin body 83) in a state where the pin body 83 has been inserted into the pin through hole 95, the notch 87 also rotates to change the position, and the locking portion 97 The tip portion and the flange portion 85 of the above are configured to interfere with each other to prevent the pin 45 from coming off (see FIG. 14).

なお、上述したピン45の抜け止めがされている状態を、鍔部85の中心軸やピン本体部83の中心軸の延伸方向から見ると、図14で示すように、ハンドル部89の重心が鍔部85の中心軸やピン本体部83の中心軸のたとえば下(たとえば、ほぼ真下)に位置している。 When the above-mentioned state in which the pin 45 is prevented from coming off is viewed from the extending direction of the central axis of the collar portion 85 and the central axis of the pin main body portion 83, the center of gravity of the handle portion 89 is as shown in FIG. It is located, for example, below (for example, substantially directly below) the central axis of the collar portion 85 or the central axis of the pin body portion 83.

吊り装置7において、継手用貫通孔93に回転部材15(継ロッド33や掘削・撹拌ロッド11)のオス継手部37が挿入されており、ピン本体部83をピン用貫通孔95に挿入し終えた状態では、図13で示すように、ピン本体部83が、オス継手部37の切り欠き49とピン用貫通孔95とを貫通している。なお、図13で示す状態でも、回転部材15が吊り具81(吊り装置7)と一体化されている。 In the suspension device 7, the male joint portion 37 of the rotating member 15 (joint rod 33 and excavation / stirring rod 11) is inserted into the joint through hole 93, and the pin body portion 83 is completely inserted into the pin through hole 95. In this state, as shown in FIG. 13, the pin body portion 83 penetrates the notch 49 of the male joint portion 37 and the pin through hole 95. Even in the state shown in FIG. 13, the rotating member 15 is integrated with the hanging tool 81 (hanging device 7).

継手用貫通孔93に回転部材15のオス継手部37を挿入し終えた状態では、オス継手部37の切り欠き49とピン用貫通孔95とで内面がほぼ連続している円柱状の貫通孔が形成されている(図13、図14参照)。 When the male joint portion 37 of the rotating member 15 has been inserted into the through hole 93 for the joint, a columnar through hole whose inner surface is substantially continuous with the notch 49 of the male joint portion 37 and the through hole 95 for the pin. Is formed (see FIGS. 13 and 14).

なお、図13(b)や図14では、高さ方向(上下方向)で、吊り装置7と段差43との間があいているが、吊り装置7と段差43とがお互いに接触していてもよい。 In addition, in FIG. 13B and FIG. 14, there is a gap between the suspension device 7 and the step 43 in the height direction (vertical direction), but the suspension device 7 and the step 43 are in contact with each other. May be good.

次に、地盤改良システム1の動作について説明する。地盤改良システム1の動作においては、たとえば、高所作業車101(図7等参照)と上述したクレーン79とがさらに必要になる。 Next, the operation of the ground improvement system 1 will be described. In the operation of the ground improvement system 1, for example, an aerial work platform 101 (see FIG. 7 and the like) and the above-mentioned crane 79 are further required.

初期状態として、穴HLを設けるところに地盤改良装置3が配置されており、地盤改良装置3の回転駆動装置21が上昇しており(図1(b)の参照符号21を参照)、この上昇している回転駆動装置21の装着部23(23A,23B)のそれぞれに、掘削・撹拌ロッド11が設置されているものとする。なお、図1(b)で示す状態は、装着部23(23A,23B)のそれぞれに掘削・撹拌ロッド11だけでなく継ロッド33も設けられているので、上述した初期状態とは若干異なる。 As an initial state, the ground improvement device 3 is arranged at the place where the hole HL is provided, and the rotation drive device 21 of the ground improvement device 3 is raised (see reference numeral 21 in FIG. 1B), and this rise. It is assumed that the excavation / stirring rod 11 is installed in each of the mounting portions 23 (23A, 23B) of the rotary drive device 21. The state shown in FIG. 1B is slightly different from the above-mentioned initial state because not only the excavation / stirring rod 11 but also the joint rod 33 is provided in each of the mounting portions 23 (23A, 23B).

初期状態として、図7(a)や図3で示すように、複数本の継ロッド33がベッセル5に格納されており、クレーン79や高所作業車101やロッドスタンドが適宜の所定の位置に配置されているものとする。 As an initial state, as shown in FIGS. 7A and 3, a plurality of joint rods 33 are stored in the vessel 5, and the crane 79, the aerial work platform 101, and the rod stand are positioned at appropriate predetermined positions. It shall be arranged.

また、初期状態として、図7(c)で示すように、ロッドスタンド9の第1の筒状部61の第1の貫通孔73には第1のスペーサ71が挿入されているものとする。 Further, as an initial state, as shown in FIG. 7C, it is assumed that the first spacer 71 is inserted into the first through hole 73 of the first tubular portion 61 of the rod stand 9.

上記初期状態において、各掘削・撹拌ロッド11(11A,11B)を回転駆動しつつ回転駆動装置21(装着部23)を下降して各掘削・撹拌ロッド11(11A,11B)の長さに相当する穴HLを掘り、この後、各掘削・撹拌ロッド11(11A,11B)を回転駆動装置21(装着部23)から外して回転駆動装置21を初期状態の位置まで上昇する。この状態では、各掘削・撹拌ロッド11(11A,11B)の上端部が地盤GLから上方に突出している。 In the above initial state, while rotating and driving each excavation / stirring rod 11 (11A, 11B), the rotation driving device 21 (mounting portion 23) is lowered to correspond to the length of each excavation / stirring rod 11 (11A, 11B). After digging the hole HL to be drilled, each excavation / stirring rod 11 (11A, 11B) is removed from the rotation drive device 21 (mounting portion 23), and the rotation drive device 21 is raised to the position in the initial state. In this state, the upper ends of the excavation / stirring rods 11 (11A, 11B) project upward from the ground GL.

また、上記初期状態において、図7(a)〜(c)で示すように、ベッセル5に格納されている複数本の継ロッド33を、吊り装置7を用いて、ロッドスタンド9に設置する。そして、地盤改良装置3の支柱19(回転駆動装置21;装着部23)を旋回し、ロッドスタンド9に設置されている各継ロッド33(33A,33B)を1本ずつ、図7で示すようにして、また、詳しくは後述するようにして、地盤改良装置3の各装着部23(23A,23B)のそれぞれに設置する。 Further, in the above initial state, as shown in FIGS. 7A to 7C, a plurality of joint rods 33 stored in the vessel 5 are installed on the rod stand 9 by using the suspension device 7. Then, the column 19 (rotation drive device 21; mounting portion 23) of the ground improvement device 3 is swiveled, and each of the joint rods 33 (33A, 33B) installed on the rod stand 9 is rotated, as shown in FIG. And, as will be described in detail later, it is installed in each of the mounting portions 23 (23A, 23B) of the ground improvement device 3.

続いて、地盤改良装置3の支柱19(回転駆動装置21;装着部23)を、再び上記旋回とは逆に旋回し、各継ロッド33(33A,33B)の下端が、穴HLの入り込んでいる各掘削・撹拌ロッド11の上端からわずかに離れているとともに、平面視において、各継ロッド33(33A,33B)それぞれの位置と各掘削・撹拌ロッド11(11A,11B)それぞれの位置とがお互いに一致している状態にする。 Subsequently, the support column 19 (rotation drive device 21; mounting portion 23) of the ground improvement device 3 is swiveled again in the opposite direction to the above swivel, and the lower ends of the joint rods 33 (33A, 33B) are inserted into the holes HL. It is slightly separated from the upper end of each excavation / stirring rod 11 and the position of each joint rod 33 (33A, 33B) and the position of each excavation / stirring rod 11 (11A, 11B) are located in a plan view. Make sure they are in agreement with each other.

続いて、回転駆動装置21(各継ロッド33)を下降して、各掘削・撹拌ロッド11(11A,11B)のオス継手部と各継ロッド33のメス継手部39とをお互いに係合させて、掘削・撹拌ロッド11Aと継ロッド33Aとをお互いに接続(接合)し、掘削・撹拌ロッド11Bと継ロッド33Bとをお互いに接続する。 Subsequently, the rotary drive device 21 (each joint rod 33) is lowered to engage the male joint portion of each excavation / stirring rod 11 (11A, 11B) and the female joint portion 39 of each joint rod 33 with each other. Then, the excavation / stirring rod 11A and the joint rod 33A are connected (joined) to each other, and the excavation / stirring rod 11B and the joint rod 33B are connected to each other.

続いて、各回転部材15(掘削・撹拌ロッド11A,11Bと継ロッド33A,33B)を回転駆動しつつ回転駆動装置21を下降させて各回転部材15(15A,15B)の長さに相当するさらに深い穴HLを掘り、この後、各掘削・撹拌ロッド11(11A,11B;継ロッド33A,33B)を回転駆動装置21から外して回転駆動装置21を初期状態の位置まで上昇する。この状態では、各回転部材15(継ロッド33A,33B)の上端部が地盤GLから上方に突出している。 Subsequently, the rotary drive device 21 is lowered while rotationally driving each rotary member 15 (excavation / stirring rods 11A, 11B and joint rods 33A, 33B) to correspond to the length of each rotary member 15 (15A, 15B). A deeper hole HL is dug, and after that, each excavation / stirring rod 11 (11A, 11B; joint rods 33A, 33B) is removed from the rotary drive device 21 and the rotary drive device 21 is raised to the position in the initial state. In this state, the upper ends of the rotating members 15 (joint rods 33A and 33B) project upward from the ground GL.

なお、各回転部材15の下降、上昇の少なくともいずれかのときに、スラリーを掘削・撹拌ロッド11の先端から吐出して地盤改良をしている。 When each of the rotating members 15 is lowered or raised at least, the slurry is discharged from the tip of the excavation / stirring rod 11 to improve the ground.

また、掘る穴HLの深さに応じて、さらに複数回、継ロッド33を継ぎ足して、各回転部材15の長さを長くする場合もある。 Further, depending on the depth of the hole HL to be dug, the joint rod 33 may be added a plurality of times to increase the length of each rotating member 15.

上記地盤改良をした後、地盤改良装置3の回転駆動装置21(各装着部23)を上昇して継ロッド33を地盤改良がされた穴HLから抜き、図8で示すようにして、また、詳しくは後述するようにして、地盤改良装置3の各装着部23(23A,23B)のそれぞれから継ロッド33(33A,33B)を取り外す。 After the above ground improvement, the rotary drive device 21 (each mounting portion 23) of the ground improvement device 3 is raised to pull out the joint rod 33 from the hole HL where the ground improvement has been made, as shown in FIG. As will be described in detail later, the joint rods 33 (33A, 33B) are removed from the respective mounting portions 23 (23A, 23B) of the ground improvement device 3.

この取り外しが終了した状態では、ロッドスタンド9の各筒状部61,63のそれぞれに各継ロッド33(33A,33B)が収容されている。 In the state where this removal is completed, each of the joint rods 33 (33A, 33B) is housed in each of the tubular portions 61, 63 of the rod stand 9.

この状態で、図9(a)で示すように、クレーン79で吊られている吊り装置7を、高所作業車101の籠103に載っている1人の作業者が、継ロッド33Aのオス継手部37に設置し、クレーン79と吊り装置7を用いて、継ロッド33Aを上昇させ第1の筒状部61から抜く。 In this state, as shown in FIG. 9A, one worker who mounts the suspension device 7 suspended by the crane 79 in the basket 103 of the aerial work platform 101 is a male of the joint rod 33A. It is installed in the joint portion 37, and the joint rod 33A is raised and pulled out from the first tubular portion 61 by using the crane 79 and the suspension device 7.

この後、クレーン79と吊り装置7を用いて、継ロッド33Aをベッセル5のところまで移動し、ベッセル5内に斜めにして収容し(図9(b)、(c)参照)、吊り装置7を継ロッド33Aから取り外す。 After that, the joint rod 33A is moved to the vessel 5 by using the crane 79 and the suspension device 7, and is slantedly housed in the vessel 5 (see FIGS. 9B and 9C), and the suspension device 7 is used. Is removed from the joint rod 33A.

この後、継ロッド33Aの場合と同様にして、継ロッド33Bをロッドスタンド9からベッセル5に移動して収容する。 After that, the joint rod 33B is moved from the rod stand 9 to the vessel 5 and accommodated in the same manner as in the case of the joint rod 33A.

ここで、ロッドスタンド9に設置されている各継ロッド33(33A,33B)を1本ずつ、地盤改良装置3の各装着部23(23A,23B)のそれぞれに設置する場合について詳しく説明する。 Here, a case where each of the joint rods 33 (33A, 33B) installed on the rod stand 9 is installed on each of the mounting portions 23 (23A, 23B) of the ground improvement device 3 will be described in detail.

図7(c)で示す状態から、クレーン79を他の箇所に移動し、地盤改良装置3の各装着部23(23A,23B)のそれぞれが、ロッドスタンド9に設置されている各継ロッド33(33A,33B)のそれぞれの真上に位置するように(図7(c)の二点鎖線で示す回転駆動装置21や各装着部23A,23Bを参照)、地盤改良装置3(各装着部23)を地盤GLやロッドスタンド9に対して移動する。 From the state shown in FIG. 7C, the crane 79 is moved to another location, and each of the mounting portions 23 (23A, 23B) of the ground improvement device 3 is each of the joint rods 33 installed on the rod stand 9. Ground improvement device 3 (each mounting portion) so as to be located directly above each of (33A, 33B) (see the rotary drive device 21 and the respective mounting portions 23A, 23B shown by the alternate long and short dash line in FIG. 7 (c)). 23) is moved with respect to the ground GL and the rod stand 9.

この移動をし終えた状態では、各装着部23(23A,23B)は、ロッドスタンド9に設置されている各継ロッド33(33A,33B)から離れている。また、上記移動は、地盤改良装置3の各装着部23(23A,23B)のそれぞれが穴HLの真上に位置している状態から、地盤改良装置本体部13を動かすことなく、支柱19のみを旋回することでなされることが望ましい。 In the state where this movement is completed, each mounting portion 23 (23A, 23B) is separated from each joint rod 33 (33A, 33B) installed on the rod stand 9. Further, in the above movement, only the support column 19 is moved without moving the ground improvement device main body 13 from the state where each of the mounting portions 23 (23A, 23B) of the ground improvement device 3 is located directly above the hole HL. It is desirable to do this by turning.

続いて、装着部23Aの下端が継ロッド33Aの上端からごく僅かに離れている状態になるまで、回転駆動装置21や各装着部23A,23Bを下降する。 Subsequently, the rotary drive device 21 and the respective mounting portions 23A and 23B are lowered until the lower end of the mounting portion 23A is slightly separated from the upper end of the joint rod 33A.

続いて、高所作業車101の籠103に載っている1人の作業者によって、継ロッド33Aの上端と装着部23Aの下端との位置合わせ(主として水平方向での位置合わせ)を行いつつ、回転駆動装置21や各装着部23A,23Bをさらに僅かに下降し、継ロッド33Aのオス継手部37を装着部23Aのメス継手部39内に挿入し、継ロッド33Aを装着部23Aに設置する。 Subsequently, one worker mounted on the basket 103 of the aerial work platform 101 aligns the upper end of the joint rod 33A with the lower end of the mounting portion 23A (mainly in the horizontal direction). The rotary drive device 21 and the mounting portions 23A and 23B are further lowered slightly, the male joint portion 37 of the joint rod 33A is inserted into the female joint portion 39 of the mounting portion 23A, and the joint rod 33A is installed in the mounting portion 23A. ..

なお、ロッドスタンド9の第1の筒状部61に設置されている継ロッド33Aの上端部は、第1の筒状部61に収容されている継ロッド33Aの下端部を支点として、僅かに搖動するようになっている(たとえば、継ロッド33Aの上端は水平方向で僅かに移動するようになっている)。そこで、継ロッド33Aの上端と装着部23Aの下端との位置合わせは、ロッドスタンド9の第1の筒状部61に設置されている継ロッド33Aを搖動させて行う。 The upper end of the joint rod 33A installed in the first tubular portion 61 of the rod stand 9 is slightly located with the lower end of the joint rod 33A housed in the first tubular portion 61 as a fulcrum. It is designed to flutter (for example, the upper end of the joint rod 33A is designed to move slightly in the horizontal direction). Therefore, the upper end of the joint rod 33A and the lower end of the mounting portion 23A are aligned by swinging the joint rod 33A installed in the first tubular portion 61 of the rod stand 9.

続いて、回転駆動装置21や各装着部23A,23Bを僅かに上昇させて、第1のスペーサ71を第1の貫通孔73から取り除く。このとき、継ロッド33Aの下端は、第1の筒状部61内に入っている。 Subsequently, the rotary drive device 21 and the mounting portions 23A and 23B are slightly raised to remove the first spacer 71 from the first through hole 73. At this time, the lower end of the joint rod 33A is inside the first tubular portion 61.

続いて、装着部23Bの下端が継ロッド33Bの上端からごく僅かに離れている状態になるまで、回転駆動装置21や各装着部23A,23Bを下降する。 Subsequently, the rotary drive device 21 and the respective mounting portions 23A and 23B are lowered until the lower end of the mounting portion 23B is slightly separated from the upper end of the joint rod 33B.

続いて、継ロッド33Aの場合と同様にして、高所作業車101の籠103に載っている1人の作業者によって、継ロッド33Bの上端と装着部23Bの下端との位置合わせを行いつつ、回転駆動装置21や各装着部23A,23Bをさらに僅かに下降し、継ロッド33Bのオス継手部37を装着部23Bのメス継手部内に挿入し、継ロッド33Bを装着部23Bに設置する。 Subsequently, in the same manner as in the case of the joint rod 33A, one worker mounted on the cage 103 of the aerial work platform 101 aligns the upper end of the joint rod 33B with the lower end of the mounting portion 23B. The rotary drive device 21 and the mounting portions 23A and 23B are further lowered slightly, the male joint portion 37 of the joint rod 33B is inserted into the female joint portion of the mounting portion 23B, and the joint rod 33B is installed in the mounting portion 23B.

これにより、各装着部23A,23Bへの各継ロッド33A,33Bの設置が修了する。この後、回転駆動装置21や各装着部23A,23Bを上昇して、各継ロッド33A,33Bをロッドスタンド9の各筒状部62,63から抜き取る。 As a result, the installation of the joint rods 33A and 33B on the mounting portions 23A and 23B is completed. After that, the rotary drive device 21 and the mounting portions 23A and 23B are raised, and the joint rods 33A and 33B are pulled out from the tubular portions 62 and 63 of the rod stand 9.

ここで、ロッドスタンド9に設置されている各継ロッド33(33A,33B)を1本ずつ、地盤改良装置3の各装着部23(23A,23B)のそれぞれに設置する場合の変形例について詳しく説明する。 Here, a modified example in which one of the joint rods 33 (33A, 33B) installed on the rod stand 9 is installed on each of the mounting portions 23 (23A, 23B) of the ground improvement device 3 will be described in detail. explain.

この変形例では、ロッドスタンド9の第2の貫通孔77にも第2のスペーサ75が設置されている点が、上述したものと異なる。 This modification is different from the above-mentioned one in that the second spacer 75 is also provided in the second through hole 77 of the rod stand 9.

すなわち、この変形例では、ロッドスタンド9の第1の貫通孔73に第1のスペーサ71が設置されており、ロッドスタンド9の第2の貫通孔77に第2のスペーサ75が設置されており、各スペーサ71,75が設置されている各筒状部61,63のそれぞれに各継ロッド33A,33Bが設置されている。 That is, in this modification, the first spacer 71 is installed in the first through hole 73 of the rod stand 9, and the second spacer 75 is installed in the second through hole 77 of the rod stand 9. , The joint rods 33A and 33B are installed in each of the tubular portions 61 and 63 in which the spacers 71 and 75 are installed.

上記状態で、地盤改良装置3の各装着部23(23A,23B)のそれぞれが、ロッドスタンド9に設置されている各継ロッド33(33A,33B)それぞれの真上に位置するように、地盤改良装置3(各装着部23)を地盤GLやロッドスタンド9に対して移動する。 In the above state, the ground so that each of the mounting portions 23 (23A, 23B) of the ground improvement device 3 is located directly above each of the joint rods 33 (33A, 33B) installed on the rod stand 9. The improvement device 3 (each mounting portion 23) is moved with respect to the ground GL and the rod stand 9.

続いて、装着部23Aの下端が継ロッド33Aの上端からごく僅かに離れている状態になるまで、回転駆動装置21や各装着部23A,23Bを下降する。 Subsequently, the rotary drive device 21 and the respective mounting portions 23A and 23B are lowered until the lower end of the mounting portion 23A is slightly separated from the upper end of the joint rod 33A.

続いて、高所作業車101の籠103に載っている1人の作業者によって、継ロッド33Aの上端と装着部23Aの下端との位置合わせを行いつつ、回転駆動装置21や各装着部23A,23Bをさらに僅かに下降し、継ロッド33Aのオス継手部37を装着部23Aのメス継手部39内に挿入し、継ロッド33Aを装着部23Aに設置する。 Subsequently, one worker mounted on the basket 103 of the aerial work platform 101 aligns the upper end of the joint rod 33A with the lower end of the mounting portion 23A, while aligning the rotary drive device 21 and each mounting portion 23A. , 23B is further lowered slightly, the male joint portion 37 of the joint rod 33A is inserted into the female joint portion 39 of the mounting portion 23A, and the joint rod 33A is installed in the mounting portion 23A.

続いて、回転駆動装置21や各装着部23A,23Bを僅かに上昇させて、第1のスペーサ71を第1の貫通孔73から取り除く。 Subsequently, the rotary drive device 21 and the mounting portions 23A and 23B are slightly raised to remove the first spacer 71 from the first through hole 73.

続いて、装着部23Bの下端が継ロッド33Bの上端からごく僅かに離れている状態になるまで、回転駆動装置21や各装着部23A,23Bを下降する。 Subsequently, the rotary drive device 21 and the respective mounting portions 23A and 23B are lowered until the lower end of the mounting portion 23B is slightly separated from the upper end of the joint rod 33B.

続いて、高所作業車101の籠103に載っている1人の作業者によって、継ロッド33Bの上端と装着部23Bの下端との位置合わせを行いつつ、回転駆動装置21や各装着部23A,23Bをさらに僅かに下降し、継ロッド33Bのオス継手部37を装着部23Bのメス継手部内に挿入し、継ロッド33Bを装着部23Bに設置する。 Subsequently, one worker mounted on the basket 103 of the aerial work platform 101 aligns the upper end of the joint rod 33B with the lower end of the mounting portion 23B, while aligning the rotary drive device 21 and each mounting portion 23A. , 23B is further lowered slightly, the male joint portion 37 of the joint rod 33B is inserted into the female joint portion of the mounting portion 23B, and the joint rod 33B is installed in the mounting portion 23B.

この設置が終了した状態では、第1のスペーサ71が存在しないので、継ロッド33Aの下端は、第1の筒状部61の上側で第1の筒状部61の下端(「X」字状の当接部69)から離れている(第2のスペーサ75の分だけ、当接部69よりも上方に位置している)。 In the state where this installation is completed, since the first spacer 71 does not exist, the lower end of the joint rod 33A is above the first tubular portion 61 and the lower end of the first tubular portion 61 (“X” shape). (It is located above the contact portion 69 by the amount of the second spacer 75).

続いて、回転駆動装置21や各装着部23A,23Bを僅かに上昇させて、第2のスペーサ75を第2の貫通孔77から取り除く。 Subsequently, the rotary drive device 21 and the mounting portions 23A and 23B are slightly raised to remove the second spacer 75 from the second through hole 77.

次に、地盤改良をした後、地盤改良装置3の回転駆動装置21(各装着部23)を上昇して継ロッド33を地盤改良がされた穴HLから抜き、地盤改良装置3の各装着部23(23A,23B)のそれぞれから継ロッド33(33A,33B)を取り外す場合について詳しく説明する。 Next, after the ground improvement, the rotation drive device 21 (each mounting portion 23) of the ground improvement device 3 is raised to pull out the joint rod 33 from the hole HL where the ground improvement has been performed, and each mounting portion of the ground improvement device 3 is removed. A case where the joint rod 33 (33A, 33B) is removed from each of the 23 (23A, 23B) will be described in detail.

この場合、ロッドスタンド9に継ロッド33(33A,33B)が設置されておらず、
ロッドスタンド9の各スペーサ設置部73,77には、スペーサ71,75が設置されていない。
In this case, the joint rods 33 (33A, 33B) are not installed on the rod stand 9.
Spacers 71 and 75 are not installed on the spacer installation portions 73 and 77 of the rod stand 9.

まず図8(a)で示すように、各装着部23(23A,23B)のそれぞれに各継ロッド33(33A,33B)のそれぞれが設置されている状態で、各継ロッド33(33A,33B)のそれぞれが、ロッドスタンド9の各筒状部61,63それぞれの上側(ほぼ真上)に位置するように、回転駆動装置21や各装着部23A,23Bを移動する。 First, as shown in FIG. 8A, each of the joint rods 33 (33A, 33B) is installed in each of the mounting portions 23 (23A, 23B), and each of the joint rods 33 (33A, 33B) is installed. ) Are located above (almost directly above) each of the tubular portions 61 and 63 of the rod stand 9, and the rotary drive device 21 and the mounting portions 23A and 23B are moved.

この移動をし終えた状態では、各継ロッド33(33A,33B)は、各筒状部61,63の上側で各筒状部61,63から離れている。また、上記移動は、上述したように、地盤改良装置本体部13を動かすことなく、支柱19のみを旋回することでなされることが望ましい。 In the state where this movement is completed, the joint rods 33 (33A, 33B) are separated from the tubular portions 61, 63 on the upper side of the tubular portions 61, 63. Further, as described above, it is desirable that the movement is performed by turning only the support column 19 without moving the ground improvement device main body 13.

続いて、継ロッド33Aの下端が第1の筒状部61の上端からごく僅かに離れている状態になるまで、回転駆動装置21や各装着部23A,23Bを下降する。 Subsequently, the rotary drive device 21 and the mounting portions 23A and 23B are lowered until the lower end of the joint rod 33A is slightly separated from the upper end of the first tubular portion 61.

続いて、ロッドスタンド9に近くにいる1人の作業者によって、継ロッド33Aの下端と第1の筒状部61の上端との位置合わせ(主として水平方向での位置合わせ)を行いつつ、回転駆動装置21や各装着部23A,23Bをさらに僅かに下降し、継ロッド33Aの下端部を第1の筒状部61内に挿入する(図8(b)参照)。 Subsequently, one worker near the rod stand 9 rotates while aligning the lower end of the joint rod 33A and the upper end of the first tubular portion 61 (mainly in the horizontal direction). The drive device 21 and the mounting portions 23A and 23B are further lowered slightly, and the lower end portion of the joint rod 33A is inserted into the first tubular portion 61 (see FIG. 8B).

なお、装着部23Aに設置されている継ロッド33Aの下端部は、装着部23Aに装着されている部位を支点として、僅かに搖動するようになっている(たとえば、継ロッド33Aの下端は水平方向で僅かに移動するようになっている)。そこで、継ロッド33Aの下端と第1の筒状部61の上端との位置合わせは、装着部23Aに装着されている継ロッド33Aを搖動させて行う。 The lower end of the joint rod 33A installed on the mounting portion 23A is slightly swung around the portion mounted on the mounting portion 23A as a fulcrum (for example, the lower end of the joint rod 33A is horizontal). It is designed to move slightly in the direction). Therefore, the lower end of the joint rod 33A and the upper end of the first tubular portion 61 are aligned by swinging the joint rod 33A mounted on the mounting portion 23A.

続いて、継ロッド33Bの下端が第2の筒状部63の上端からごく僅かに離れている状態になるまで、回転駆動装置21や各装着部23A,23Bを下降する。この下降でも、継ロッド33Aの下端部が第1の筒状部61内に挿入されたままになっている。 Subsequently, the rotary drive device 21 and the mounting portions 23A and 23B are lowered until the lower end of the joint rod 33B is slightly separated from the upper end of the second tubular portion 63. Even in this lowering, the lower end portion of the joint rod 33A remains inserted in the first tubular portion 61.

装着部23Aに設置されている継ロッド33Aの場合と同様にして、ロッドスタンド9に近くにいる1人の作業者によって、継ロッド33Bの下端と第2の筒状部63の上端との位置合わせを行いつつ、回転駆動装置21や各装着部23A,23Bをさらにわずかに下降し、継ロッド33Bの下端部を第2の筒状部63内に挿入する。この挿入後、各継ロッド33(33A,33B)の下端がロッドスタンド9のベース体65に接する程度まで、回転駆動装置21や各装着部23A,23Bをさらに下降し、各装着部23A,23Bから各継ロッド33(33A,33B)から各継ロッド33(33A,33B)を取り外し、回転駆動装置21や各装着部23A,23Bを移動する(図8(c)参照)。 Similar to the case of the joint rod 33A installed in the mounting portion 23A, the position of the lower end of the joint rod 33B and the upper end of the second tubular portion 63 by one worker near the rod stand 9. While performing alignment, the rotary drive device 21 and the mounting portions 23A and 23B are further lowered slightly, and the lower end portion of the joint rod 33B is inserted into the second tubular portion 63. After this insertion, the rotary drive device 21 and the mounting portions 23A and 23B are further lowered until the lower ends of the joint rods 33 (33A and 33B) are in contact with the base body 65 of the rod stand 9, and the mounting portions 23A and 23B are further lowered. The joint rods 33 (33A, 33B) are removed from the joint rods 33 (33A, 33B), and the rotary drive device 21 and the mounting portions 23A, 23B are moved (see FIG. 8C).

地盤改良システム1によれば、地盤改良装置3と継ロッド33を複数本格納するベッセル5と継ロッド33をクレーン79で吊るために継ロッド33の上端部に形成されている継手部37に設置される吊り装置7とを備えて構成されているので、特許文献1に記載の従来の方法のように、別途、穴を掘って継ロッド等を穴に埋没させておく必要が無く、また、この埋没させておいた継ロッドを引き抜く必要が無く、さらに、継ロッド33の着脱時に、地盤改良装置3を軟弱な地盤GLの上で移動させる必要も無いので、継ロッド33の着脱に要する時間を短くし、継ロッド33の着脱を容易に行うことができる。 According to the ground improvement system 1, the vessel 5 for storing the ground improvement device 3 and a plurality of joint rods 33 and the joint rod 33 are installed at the joint portion 37 formed at the upper end of the joint rod 33 for suspending by the crane 79. Since it is configured to be provided with the suspension device 7, it is not necessary to separately dig a hole and bury a joint rod or the like in the hole as in the conventional method described in Patent Document 1. Since it is not necessary to pull out the buried joint rod and it is not necessary to move the ground improvement device 3 on the soft ground GL when attaching / detaching the joint rod 33, the time required for attaching / detaching the joint rod 33 is required. Can be shortened and the joint rod 33 can be easily attached and detached.

また、地盤改良システム1では、第1のスペーサ71が設置されているロッドスタンド9の第1の支持部61と第2の支持部63のそれぞれに各継ロッド33(33A,33B)のそれぞれが設置されている状態で、地盤改良装置3の各装着部23(23A,23B)のそれぞれを各継ロッド33それぞれの上側に配置し、この配置後に、第1の装着部23Aの下端が第1の継ロッド33Aの上端のところに位置するまで、各装着部23を下降し、この下降後に、第1の装着部23Aに対する第1の継ロッド33Aの継手部37の位置合わせを行うとともに、各装着部23をさらに下降して、第1の装着部23Aに第1の継ロッド33Aの継手部37を挿入し、第1の継ロッド33Aを第1の装着部23Aに設置するようになっている。 Further, in the ground improvement system 1, each of the joint rods 33 (33A, 33B) is attached to each of the first support portion 61 and the second support portion 63 of the rod stand 9 in which the first spacer 71 is installed. In the installed state, each of the mounting portions 23 (23A, 23B) of the ground improvement device 3 is arranged above each joint rod 33, and after this arrangement, the lower end of the first mounting portion 23A is the first. Each mounting portion 23 is lowered until it is located at the upper end of the joint rod 33A, and after this lowering, the joint portion 37 of the first joint rod 33A is aligned with the first mounting portion 23A, and each The mounting portion 23 is further lowered, the joint portion 37 of the first joint rod 33A is inserted into the first mounting portion 23A, and the first joint rod 33A is installed in the first mounting portion 23A. There is.

また、地盤改良システム1では、第1の装着部23Aに第1の継ロッド33Aを設置した後、第1のスペーサ設置部73から第1のスペーサ71を取り除き、第2の装着部23Bの下端が第2の継ロッド33Bの上端のところに位置するまで、各装着部23を下降し、この下降後に、第2の装着部23Bに対する第2の継ロッド33Bの継手部37の位置合わせを行うとともに、各装着部23をさらに下降して、第2の装着部23Bに第2の継ロッド33Bの継手部37を挿入し、第2の継ロッド33Bを第2の装着部23Bに設置するようになっている。 Further, in the ground improvement system 1, after installing the first joint rod 33A on the first mounting portion 23A, the first spacer 71 is removed from the first spacer mounting portion 73, and the lower end of the second mounting portion 23B is removed. Each mounting portion 23 is lowered until is located at the upper end of the second joint rod 33B, and after this lowering, the joint portion 37 of the second joint rod 33B is aligned with the second mounting portion 23B. At the same time, each mounting portion 23 is further lowered, the joint portion 37 of the second joint rod 33B is inserted into the second mounting portion 23B, and the second joint rod 33B is installed in the second mounting portion 23B. It has become.

これにより、地盤改良システム1によれば、各装着部23に各継ロッド33を設置するとき、第1の装着部23Aに対する第1の継ロッド33Aの継手部37の位置合わせと第2の装着部23Bに対する第2の継ロッド33Bの継手部37の位置合わせとを時間をずらしてたとえば1人の作業者で行うことができ、各継ロッド33の各装着部23への設置を効率良く行うことができる。 As a result, according to the ground improvement system 1, when each joint rod 33 is installed in each mounting portion 23, the joint portion 37 of the first joint rod 33A is aligned with the first mounting portion 23A and the second mounting portion 23A is mounted. The alignment of the joint portion 37 of the second joint rod 33B with respect to the portion 23B can be performed by, for example, one worker at different times, and the installation of each joint rod 33 at each mounting portion 23 is efficiently performed. be able to.

また、地盤改良システム1では、地盤改良装置3の各装着部23のそれぞれに継ロッド33が設置されている状態で、各装着部23に設置されている各継ロッド33のそれぞれを、ロッドスタンド9の各筒状部61,63それぞれの上側に配置し、この配置後に、第1の継ロッド33Aの下端がロッドスタンド9の第1の支持部61の上端のところに位置するまで、各装着部23を下降し、この下降後に、第1の筒状部61に対する第1の継ロッド33Aの下端部の位置合わせを行うようになっている。 Further, in the ground improvement system 1, in a state where the joint rods 33 are installed in each of the mounting portions 23 of the ground improvement device 3, each of the joint rods 33 installed in each mounting portion 23 is set as a rod stand. 9 is arranged above each of the tubular portions 61 and 63, and after this arrangement, each mounting is performed until the lower end of the first joint rod 33A is located at the upper end of the first support portion 61 of the rod stand 9. The portion 23 is lowered, and after the lowering, the lower end portion of the first joint rod 33A is aligned with the first tubular portion 61.

また、地盤改良システム1では、第1の継ロッド33Aの下端部の位置合わせを行った後、第2の継ロッド33Bの下端が第2の筒状部63の上端のところに位置するまで、各装着部23を下降し、この下降後に、第2の筒状部63に対する第2の継ロッド33Bの下端部の位置合わせを行うようになっている。 Further, in the ground improvement system 1, after the lower end portion of the first joint rod 33A is aligned, until the lower end of the second joint rod 33B is located at the upper end of the second tubular portion 63. Each mounting portion 23 is lowered, and after this lowering, the lower end portion of the second joint rod 33B is aligned with the second tubular portion 63.

また、地盤改良システム1では、第2の継ロッド33Bの下端部の位置合わせを行った後、各継ロッド33の下端がロッドスタンド9の各支持部61,63の下端のところ(ベース体65のところ)に位置するまで、各装着部23をさらに下降し、この下降後に、各装着部23から各継ロッド33を取り外すようになっている。 Further, in the ground improvement system 1, after aligning the lower ends of the second joint rods 33B, the lower ends of the joint rods 33 are at the lower ends of the support portions 61 and 63 of the rod stand 9 (base body 65). Each mounting portion 23 is further lowered until it is located at), and after this lowering, each connecting rod 33 is removed from each mounting portion 23.

これにより、地盤改良システム1によれば、各装着部23から各継ロッド33を取り外すとき、ロッドスタンド9の第1の筒状部61の上端に対する第1の継ロッド33Aの下端部の位置合わせと第2の筒状部63の上端に対する第2の継ロッド33Bの下端部の位置合わせとを時間をずらしてたとえば1人の作業者で行うことができ、継ロッド33の各筒状部61,63への設置を効率良く行うことができる。 As a result, according to the ground improvement system 1, when each joint rod 33 is removed from each mounting portion 23, the lower end portion of the first joint rod 33A is aligned with the upper end of the first tubular portion 61 of the rod stand 9. And the alignment of the lower end of the second joint rod 33B with respect to the upper end of the second tubular portion 63 can be performed by, for example, one worker at different times, and each tubular portion 61 of the joint rod 33 can be performed. , 63 can be installed efficiently.

吊り装置7によれば、ピン45の抜け止めがされている状態が、ピン45の鍔部85やピン本体部83の中心軸の延伸方向から見てハンドル部89の重心が上記の中心軸のたとえば真下に位置している状態になる構成であるので、安定した状態でピン45の抜け止めをすることができる。 According to the suspension device 7, the center of gravity of the handle portion 89 is the above-mentioned central axis when the pin 45 is prevented from coming off when viewed from the extension direction of the central axis of the flange portion 85 of the pin 45 and the pin main body portion 83. For example, since the configuration is such that the pin 45 is located directly below, the pin 45 can be prevented from coming off in a stable state.

吊り装置7によれば、オス継手部37の切り欠き49とピン用貫通孔95とで内面がほぼ連続している円柱状の貫通孔が形成されているので、高剛性でピン45を保持することができる。 According to the suspension device 7, the notch 49 of the male joint portion 37 and the through hole 95 for the pin form a columnar through hole whose inner surface is substantially continuous, so that the pin 45 is held with high rigidity. be able to.

また、吊り装置7によれば、継ロッド33の上端がオス継手部37になっているので、継ロッド33の上端にゴミ等の異物が存在していても発見が容易であり除去が容易になっている。 Further, according to the suspension device 7, since the upper end of the joint rod 33 is the male joint portion 37, even if foreign matter such as dust is present at the upper end of the joint rod 33, it is easy to find and remove it. It has become.

また、地盤改良システム1において、第1のスペーサ71と第2のスペーサ75とを用いた場合であっても、第1のスペーサ71のみを用いた場合と同様にして、第1の装着部23Aに対する第1の継ロッド33Aの継手部37の位置合わせと第2の装着部23Bに対する第2の継ロッド33Bの継手部37の位置合わせとを時間をずらしてたとえば1人の作業者で行うことができ、継ロッドの各装着部23への設置を効率良く行うことができる。 Further, even when the first spacer 71 and the second spacer 75 are used in the ground improvement system 1, the first mounting portion 23A is the same as when only the first spacer 71 is used. The alignment of the joint portion 37 of the first joint rod 33A with respect to the second mounting portion 23B and the alignment of the joint portion 37 of the second joint rod 33B with respect to the second mounting portion 23B are performed by, for example, one worker at different times. Therefore, the joint rod can be efficiently installed on each mounting portion 23.

さらに、第2のスペーサ75を用いているので、第2の装着部23Bに第2の継ロッド33Bの継手部37を挿入し、第2の継ロッド33Bを第2の装着部23Bに設置するときに、第1の装着部23Aに設置されている第1の継ロッド33Aの下端が、ロッドスタンド9の第1の筒状部61の底(ベース体65)に接触してしまう事態を容易に回避することができる。 Further, since the second spacer 75 is used, the joint portion 37 of the second joint rod 33B is inserted into the second mounting portion 23B, and the second joint rod 33B is installed in the second mounting portion 23B. Occasionally, it is easy for the lower end of the first joint rod 33A installed in the first mounting portion 23A to come into contact with the bottom (base body 65) of the first tubular portion 61 of the rod stand 9. Can be avoided.

なお、上述したものを方法の発明として把握してもよい。 The above-mentioned one may be grasped as an invention of the method.

すなわち、掘削・撹拌ロッドを備えて構成されている第1の回転部材が設置され、上下方向に移動自在である第1の設置部と、前記第1の回転部材と同様に構成されている第2の回転部材が設置され、前記第1の設置部とともに上下方向に移動位置決め自在である第2の設置部とを備え、前記各設置部のそれぞれに装着された各回転部材のそれぞれを回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良装置3に、ロッドスタンド9を用いて継ロッド33を設置する継ロッド設置方法において、第1のスペーサ71が設置されている第1の支持部61に第1の継ロッド33Aを設置し、前記第2の支持部63に第2の継ロッド33Bを設置する継ロッド設置工程と、前記継ロッド設置工程で前記各支持部のそれぞれに前記各継ロッドのそれぞれが設置されている状態で、前記地盤改良装置の第1の設置部を前記第1の継ロッドの上側に配置し、この配置後に、前記第1の設置部の下端が前記第1の継ロッドの上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第1の設置部に対する前記第1の継ロッドの上端部の継手部の位置合わせを行うとともに、前記各設置部をさらに下降して、前記第1の設置部に前記第1の継ロッドの継手部を挿入し、前記第1の継ロッドを前記第1の設置部に設置する第1の継ロッド設置工程と、前記第1の継ロッド設置工程で前記第1の設置部に前記第1の継ロッドを設置した後、前記第1の支持部から第1のスペーサを取り除き、前記第2の設置部の下端が前記第2の継ロッドの上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第2の設置部に対する前記第2の継ロッドの上端部の継手部の位置合わせを行うとともに、前記各設置部をさらに下降して、前記第2の設置部に前記第2の継ロッドの継手部を挿入し、前記第2の継ロッドを前記第2の設置部に設置する第2の継ロッド設置工程とを有する継ロッド設置方法として把握してもよい。 That is, the first rotating member provided with the excavation / stirring rod is installed, and the first installation portion that is movable in the vertical direction and the first rotating member that is configured in the same manner as the first rotating member. Two rotating members are installed, and together with the first installation portion, a second installation portion that can be moved and positioned in the vertical direction is provided, and each rotating member mounted on each of the installation portions is rotated. The first method in the joint rod installation method of installing a joint rod 33 using a rod stand 9 in a ground improvement device 3 for improving the ground by excavating the ground by descending and mixing and stirring the ground improvement material. A joint rod installation step of installing the first joint rod 33A on the first support portion 61 on which the spacer 71 is installed and installing the second joint rod 33B on the second support portion 63, and the joint rod In the state where each of the joint rods is installed on each of the support portions in the installation process, the first installation portion of the ground improvement device is arranged on the upper side of the first joint rod, and after this arrangement. Each of the installation portions is lowered until the lower end of the first installation portion is located at the upper end of the first joint rod, and after this lowering, the first joint rod with respect to the first installation portion. The joint portion of the upper end portion of the rod is aligned, and each of the installation portions is further lowered to insert the joint portion of the first joint rod into the first installation portion, and the first joint rod is inserted. After installing the first joint rod in the first installation portion in the first joint rod installation step of installing in the first installation portion and the first joint rod installation step, the first support The first spacer is removed from the portion, each installation portion is lowered until the lower end of the second installation portion is located at the upper end of the second joint rod, and after this lowering, the second installation portion is performed. The joint portion of the upper end portion of the second joint rod is aligned with respect to the portion, and each installation portion is further lowered to insert the joint portion of the second joint rod into the second installation portion. , The second joint rod may be grasped as a joint rod installation method including a second joint rod installation step of installing the second joint rod in the second installation portion.

また、地盤改良装置3に、ロッドスタンド9を用いて継ロッドを設置する継ロッド設置方法において、前記第1のスペーサが設置されている第1の支持部に第1の継ロッドを設置し、前記第2のスペーサが設置されている第2の支持部に第2の継ロッドを設置する継ロッド設置工程と、前記継ロッド設置工程で前記各支持部のそれぞれに前記各継ロッドのそれぞれが設置されている状態で、前記地盤改良装置の第1の設置部を前記第1の継ロッドの上側に配置し、この配置後に、前記第1の設置部の下端が前記第1の継ロッドの上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第1の設置部に対する前記第1の継ロッドの上端部の継手部の位置合わせを行うとともに、前記各設置部をさらに下降して、前記第1の設置部に前記第1の継ロッドの継手部を挿入し、前記第1の継ロッドを前記第1の設置部に設置する第1の継ロッド設置工程と、前記第1の継ロッド設置工程で前記第1の設置部に前記第1の継ロッドを設置した後、前記第1の支持部から第1のスペーサを取り除き、前記第2の設置部の下端が前記第2の継ロッドの上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第2の設置部に対する前記第2の継ロッドの上端部の継手部の位置合わせを行うとともに、前記各設置部をさらに下降して、前記第2の設置部に前記第2の継ロッドの継手部を挿入し、前記第2の継ロッドを前記第2の設置部に設置する第2の継ロッド設置工程とを有する継ロッド設置方法として把握してもよい。 Further, in the joint rod installation method in which the joint rod is installed in the ground improvement device 3 by using the rod stand 9, the first joint rod is installed in the first support portion where the first spacer is installed. In the joint rod installation step of installing the second joint rod in the second support portion where the second spacer is installed, and in the joint rod installation step, each of the joint rods is attached to each of the support portions. In the installed state, the first installation portion of the ground improvement device is arranged above the first joint rod, and after this arrangement, the lower end of the first installation portion is of the first joint rod. Each of the installation portions is lowered until it is located at the upper end, and after this lowering, the joint portion of the upper end portion of the first joint rod is aligned with the first installation portion, and the respective installation portions are aligned. With the first joint rod installation step of further lowering and inserting the joint portion of the first joint rod into the first installation portion and installing the first joint rod in the first installation portion. After installing the first joint rod in the first installation portion in the first joint rod installation step, the first spacer is removed from the first support portion, and the lower end of the second installation portion is removed. Each installation portion is lowered until is located at the upper end of the second joint rod, and after this lowering, the joint portion of the upper end portion of the second joint rod is aligned with the second installation portion. At the same time, each of the installation portions is further lowered, the joint portion of the second joint rod is inserted into the second installation portion, and the second joint rod is installed in the second installation portion. It may be grasped as a joint rod installation method having a second joint rod installation step.

また、地盤改良装置3から、ロッドスタンド9を用いて前記継ロッドを取り外す継ロッド取り外し方法において、前記各設置部のそれぞれに継ロッドが設置されている状態で、前記地盤改良装置の第1の設置部を前記第1の支持部の上側に配置し、前記地盤改良装置の第2の設置部を第2の支持部の上側に配置し、この配置後に、前記第1の継ロッドの下端が前記第1の支持部の上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第1の支持部に対する前記第1の継ロッドの下端部の位置合わせを行う第1の位置合わせ工程と、前記第1の位置合わせ工程で前記第1の継ロッドの下端部の位置合わせを行った後、前記各設置部をさらに下降し、前記第1の継ロッドの下端部を前記第1の支持部に係合させる第1の係合工程と、前記第1の係合工程で前記第1の継ロッドの下端部を前記第1の支持部に係合させた後、前記第2の継ロッドの下端が前記第2の支持部の上端のところに位置するまで、前記各設置部をさらに下降し、この下降後に、前記第2の支持部に対する前記第2の継ロッドの下端部の位置合わせを行う第2の位置合わせ工程と、前記第2の位置合わせ工程で前記第2の継ロッドの下端部の位置合わせを行った後、前記各設置部をさらに下降し、前記第2の継ロッドの下端部を前記第2の支持部に係合させる第2の係合工程と、前記第2の係合工程で前記第2の継ロッドの下端部を前記第2の支持部に係合させた後、前記各継ロッドの下端が前記各支持部の下端のところに位置するまで、前記各設置部をさらに下降し、この下降後に、前記各設置部から前記各継ロッドを取り外す取り外し工程とを有する継ロッド取り外し方法としては把握してもよい。 Further, in the method of removing the joint rod from the ground improvement device 3 by using the rod stand 9, the first of the ground improvement device is in a state where the joint rod is installed in each of the installation portions. The installation portion is arranged above the first support portion, the second installation portion of the ground improvement device is arranged above the second support portion, and after this arrangement, the lower end of the first joint rod A first that lowers each installation portion until it is located at the upper end of the first support portion, and then aligns the lower end portion of the first joint rod with respect to the first support portion. After aligning the lower end portion of the first joint rod in the alignment step of and the first alignment step, each installation portion is further lowered to lower the lower end portion of the first joint rod. After engaging the lower end portion of the first joint rod with the first support portion in the first engagement step of engaging with the first support portion and the first engagement step, the said Each installation portion is further lowered until the lower end of the second joint rod is located at the upper end of the second support portion, and after this lowering, the second joint rod with respect to the second support portion After aligning the lower end of the second joint rod in the second alignment step of aligning the lower end portion and the second alignment step, each of the installation portions is further lowered to obtain the above. In the second engaging step of engaging the lower end of the second joint rod with the second support portion and the second engaging step, the lower end of the second joint rod is supported by the second support. After engaging with the portions, the respective installation portions are further lowered until the lower ends of the respective joint rods are located at the lower ends of the respective support portions, and after this lowering, the respective joint rods are further lowered. It may be grasped as a method of removing the joint rod having the removal step of removing the rod.

また、地盤改良装置3を用いた地盤改良方法において、ベッセルに格納されている複数本の継ロッドを、吊り装置7を用いて、ロッドスタンド9に設置し、この設置されている各継ロッドを1本ずつ、上述した継ロッド設置方法で前記地盤改良装置の各設置部のそれぞれに設置する継ロッド設置工程と、前記継ロッド設置工程で継ロッドを各設置部のそれぞれに設置した後、前記各設置部のそれぞれに装着された各回転部材のそれぞれを回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良工程と、前記地盤改良工程で地盤改良をした後、前記地盤改良装置の各設置部を上昇させて前記継ロッドを前記地盤改良がされた穴から抜き、上述した継ロッド取り外し工程で前記地盤改良装置の各設置部のそれぞれから継ロッドを取り外す取り外し工程とを有する地盤改良方法として把握してもよい。 Further, in the ground improvement method using the ground improvement device 3, a plurality of joint rods stored in the vessel are installed on the rod stand 9 by using the suspension device 7, and each of the installed joint rods is installed. After installing the joint rods one by one in each of the installation parts of the ground improvement device by the above-mentioned joint rod installation method and in the joint rod installation process, the joint rods are installed in each of the installation parts. In the ground improvement process of excavating the ground by rotating and descending each of the rotating members mounted on each installation part, mixing and stirring the ground improvement material, and the ground improvement process of improving the ground. After the ground improvement is performed, each installation portion of the ground improvement device is raised to pull out the joint rod from the hole where the ground improvement has been performed, and in the above-mentioned joint rod removal step, each installation portion of the ground improvement device is used. It may be grasped as a ground improvement method having a removal step of removing the joint rod.

1 地盤改良システム
3 地盤改良装置
5 ベッセル
7 吊り装置
9 ロッドスタンド
11(11A、11B) 掘削・撹拌ロッド
15(15A、15B) 回転部材
23(23A) 第1の設置部(第1の装着部)
23(23B) 第2の設置部(第2の装着部)
33(33A) 第1の継ロッド
33(33B) 第2の継ロッド
37 オス継手部
45 ピン
49 切り欠き
61 第1の支持部(第1の筒状部)
63 第2の支持部(第2の筒状部)
71 第1のスペーサ
73 第1のスペーサ設置部
75 第2のスペーサ
77 第2のスペーサ設置部
79 クレーン
81 吊り具
83 ピン本体部
85 鍔部
87 切り欠き
93 継手用貫通孔
95 ピン用貫通孔
97 係止部
GL 地盤
1 Ground improvement system 3 Ground improvement device 5 Vessel 7 Suspension device 9 Rod stand 11 (11A, 11B) Excavation / stirring rod 15 (15A, 15B) Rotating member 23 (23A) First installation part (first mounting part)
23 (23B) Second installation part (second mounting part)
33 (33A) 1st joint rod 33 (33B) 2nd joint rod 37 Male joint 45 pins 49 Notch 61 1st support (1st tubular part)
63 Second support part (second tubular part)
71 1st spacer 73 1st spacer installation part 75 2nd spacer 77 2nd spacer installation part 79 Crane 81 Suspension device 83 Pin body part 85 Flange part 87 Notch 93 Joint through hole 95 Pin through hole 97 Locking part GL ground

Claims (10)

地盤改良に用いる第1の継ロッドの下端部に係合することで前記第1の継ロッドを起立させた状態で支持する第1の支持部と、
地盤改良に用いる第2の継ロッドの下端部に係合することで前記第2の継ロッドを起立させた状態で支持し、この支持状態では、前記第2の継ロッドに係合する部位の上端が、前記第1の継ロッドと前記第1の支持部とがお互いに係合する部位の上端よりも下方に位置している第2の支持部と、
を有することを特徴とするロッドスタンド。
A first support portion that supports the first joint rod in an upright state by engaging with the lower end portion of the first joint rod used for ground improvement.
By engaging with the lower end of the second joint rod used for ground improvement, the second joint rod is supported in an upright state, and in this supported state, the portion of the portion that engages with the second joint rod. A second support portion whose upper end is located below the upper end of the portion where the first joint rod and the first support portion engage with each other.
A rod stand characterized by having.
請求項1に記載のロッドスタンドにおいて、
前記第1の支持部には、前記第1の継ロッドを嵩上げするための第1のスペーサを設置する第1のスペーサ設置部が設けられていることを特徴とするロッドスタンド。
In the rod stand according to claim 1,
The rod stand is characterized in that the first support portion is provided with a first spacer installation portion for installing a first spacer for raising the first joint rod.
請求項2に記載のロッドスタンドにおいて、
前記第2の支持部には、前記第2の継ロッドを、前記第1の継ロッドよりも少ない量だけ嵩上げするための第2のスペーサを設置する第2のスペーサ設置部が設けられていることを特徴とするロッドスタンド。
In the rod stand according to claim 2.
The second support portion is provided with a second spacer installation portion for installing a second spacer for raising the second joint rod by a smaller amount than the first joint rod. A rod stand that features that.
請求項1〜請求項3のいずれか1項に記載のロッドスタンドと、
掘削・撹拌ロッドとこの掘削・撹拌ロッドに接続される継ロッドとを備えて構成される回転部材を回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良装置と、
前記継ロッドを複数本格納するベッセルと、
前記継ロッドをクレーンで吊るために、前記継ロッドの上端部に形成されている継手部に設置される吊り装置と、
を有することを特徴とする地盤改良システム。
The rod stand according to any one of claims 1 to 3.
The ground is excavated by rotating and descending a rotating member composed of an excavation / stirring rod and a joint rod connected to the excavation / stirring rod, and the ground is improved by mixing and stirring the ground improvement material. Ground improvement equipment and
A vessel that stores a plurality of the joint rods and
In order to suspend the joint rod with a crane, a suspension device installed at a joint portion formed at the upper end of the joint rod, and a suspension device.
A ground improvement system characterized by having.
円筒状もしくは円柱状に形成されたピン本体部と、このピン本体部の長手方向の一方の端に設けられた鍔部と、この鍔部に形成された切り欠きとを備えて構成されているピンと、
地盤改良に用いられる回転部材のオス継手部が挿入される継手用貫通孔と、前記ピン本体部の中心軸を回動中心にして回動自在なように前記ピンのピン本体部が挿入され、一部が前記継手用貫通孔を通過しているピン用貫通孔と、係止部とを備えて構成されている吊り具と、
を有し、前記ピン本体部を前記ピン用貫通孔に挿入するときには、前記ピンの切り欠きを前記係止部が通過することで、前記鍔部と前記係止部とがお互いに非干渉状態であり、前記ピン本体部を前記ピン用貫通孔に挿入し終えた状態で前記ピンを回動することで、前記係止部と前記鍔部とがお互いに干渉し、前記ピンの抜け止めがされるように構成されていることを特徴とする吊り装置。
It is configured to include a pin body portion formed in a cylindrical or columnar shape, a flange portion provided at one end of the pin body portion in the longitudinal direction, and a notch formed in the flange portion. idea,
A through hole for a joint into which a male joint portion of a rotating member used for ground improvement is inserted and a pin body portion of the pin are inserted so as to be rotatable around the central axis of the pin body portion. A hanging tool provided with a through hole for a pin, a part of which passes through the through hole for a joint, and a locking portion.
When the pin body portion is inserted into the pin through hole, the locking portion passes through the notch of the pin, so that the collar portion and the locking portion do not interfere with each other. By rotating the pin in a state where the pin body portion has been inserted into the through hole for the pin, the locking portion and the flange portion interfere with each other, and the pin is prevented from coming off. A suspension device, characterized in that it is configured to be.
請求項5に記載の吊り装置において、
前記継手用貫通孔に前記回転部材の継手部が挿入されており、前記ピン本体部を前記ピン用貫通孔に挿入し終えた状態では、前記ピン本体部が、前記継手部の切り欠きと前記ピン用貫通孔とを貫通しており、前記回転部材が前記吊り具と一体化されるように構成されていることを特徴とする吊り装置。
In the suspension device according to claim 5,
In a state where the joint portion of the rotating member is inserted into the joint through hole and the pin main body portion has been inserted into the pin through hole, the pin main body portion has a notch in the joint portion and the above. A suspending device that penetrates a through hole for a pin and is configured such that the rotating member is integrated with the suspending tool.
掘削・撹拌ロッドを備えて構成されている第1の回転部材が設置され、上下方向に移動自在である第1の設置部と、前記第1の回転部材と同様に構成されている第2の回転部材が設置され、前記第1の設置部とともに上下方向に移動位置決め自在である第2の設置部とを備え、前記各設置部のそれぞれに装着された各回転部材のそれぞれを回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良装置に、請求項2に記載のロッドスタンドを用いて継ロッドを設置する継ロッド設置方法において、
前記第1のスペーサが設置されている第1の支持部に第1の継ロッドを設置し、前記第2の支持部に第2の継ロッドを設置する継ロッド設置工程と、
前記継ロッド設置工程で前記各支持部のそれぞれに前記各継ロッドのそれぞれが設置されている状態で、前記地盤改良装置の第1の設置部を前記第1の継ロッドの上側に配置し、この配置後に、前記第1の設置部の下端が前記第1の継ロッドの上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第1の設置部に対する前記第1の継ロッドの上端部の継手部の位置合わせを行うとともに、前記各設置部をさらに下降して、前記第1の設置部に前記第1の継ロッドの継手部を挿入し、前記第1の継ロッドを前記第1の設置部に設置する第1の継ロッド設置工程と、
前記第1の継ロッド設置工程で前記第1の設置部に前記第1の継ロッドを設置した後、前記第1の支持部から第1のスペーサを取り除き、前記第2の設置部の下端が前記第2の継ロッドの上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第2の設置部に対する前記第2の継ロッドの上端部の継手部の位置合わせを行うとともに、前記各設置部をさらに下降して、前記第2の設置部に前記第2の継ロッドの継手部を挿入し、前記第2の継ロッドを前記第2の設置部に設置する第2の継ロッド設置工程と、
を有することを特徴とする継ロッド設置方法。
A first installation portion in which a first rotating member provided with an excavation / stirring rod is installed and is movable in the vertical direction, and a second installation portion configured in the same manner as the first rotating member. A rotating member is installed, and the first installation portion is provided with a second installation portion that can be moved and positioned in the vertical direction, and each of the rotating members mounted on each of the installation portions is rotated and lowered. In the joint rod installation method of installing a joint rod using the rod stand according to claim 2, the ground improvement device for improving the ground by excavating the ground by mixing and stirring the ground improvement material is used.
A joint rod installation step of installing a first joint rod on the first support portion on which the first spacer is installed and installing a second joint rod on the second support portion.
In the state where each of the joint rods is installed on each of the support portions in the joint rod installation step, the first installation portion of the ground improvement device is arranged above the first joint rod. After this arrangement, each of the installation portions is lowered until the lower end of the first installation portion is located at the upper end of the first joint rod, and after this lowering, the first with respect to the first installation portion. The joint portion of the upper end portion of the joint rod is aligned, and each of the installation portions is further lowered to insert the joint portion of the first joint rod into the first installation portion. The first joint rod installation step of installing the joint rod in the first installation portion, and
After installing the first joint rod in the first installation portion in the first joint rod installation step, the first spacer is removed from the first support portion, and the lower end of the second installation portion is Each of the installation portions is lowered until it is located at the upper end of the second joint rod, and after this lowering, the joint portion of the upper end portion of the second joint rod is aligned with the second installation portion. At the same time, each of the installation portions is further lowered, the joint portion of the second joint rod is inserted into the second installation portion, and the second joint rod is installed in the second installation portion. 2 joint rod installation process and
A method of installing a joint rod, which is characterized by having.
掘削・撹拌ロッドを備えて構成されている第1の回転部材が設置され、上下方向に移動自在である第1の設置部と、前記第1の回転部材と同様に構成されている第2の回転部材が設置され、前記第1の設置部とともに上下方向に移動位置決め自在である第2の設置部とを備え、前記各設置部のそれぞれに装着された各回転部材のそれぞれを回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良装置に、請求項3に記載のロッドスタンドを用いて継ロッドを設置する継ロッド設置方法において、
前記第1のスペーサが設置されている第1の支持部に第1の継ロッドを設置し、前記第2のスペーサが設置されている第2の支持部に第2の継ロッドを設置する継ロッド設置工程と、
前記継ロッド設置工程で前記各支持部のそれぞれに前記各継ロッドのそれぞれが設置されている状態で、前記地盤改良装置の第1の設置部を前記第1の継ロッドの上側に配置し、この配置後に、前記第1の設置部の下端が前記第1の継ロッドの上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第1の設置部に対する前記第1の継ロッドの上端部の継手部の位置合わせを行うとともに、前記各設置部をさらに下降して、前記第1の設置部に前記第1の継ロッドの継手部を挿入し、前記第1の継ロッドを前記第1の設置部に設置する第1の継ロッド設置工程と、
前記第1の継ロッド設置工程で前記第1の設置部に前記第1の継ロッドを設置した後、前記第1の支持部から前記第1のスペーサを取り除き、前記第2の設置部の下端が前記第2の継ロッドの上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第2の設置部に対する前記第2の継ロッドの上端部の継手部の位置合わせを行うとともに、前記各設置部をさらに下降して、前記第2の設置部に前記第2の継ロッドの継手部を挿入し、前記第2の継ロッドを前記第2の設置部に設置する第2の継ロッド設置工程と、
を有することを特徴とする継ロッド設置方法。
A first installation portion in which a first rotating member provided with an excavation / stirring rod is installed and is movable in the vertical direction, and a second installation portion configured in the same manner as the first rotating member. A rotating member is installed, and the first installation portion is provided with a second installation portion that can be moved and positioned in the vertical direction, and each of the rotating members mounted on each of the installation portions is rotated and lowered. In the joint rod installation method of installing a joint rod using the rod stand according to claim 3, the ground improvement device for improving the ground by excavating the ground by mixing and stirring the ground improvement material is used.
A joint rod is installed in the first support portion where the first spacer is installed, and a second joint rod is installed in the second support portion where the second spacer is installed. Rod installation process and
In the state where each of the joint rods is installed on each of the support portions in the joint rod installation step, the first installation portion of the ground improvement device is arranged above the first joint rod. After this arrangement, each of the installation portions is lowered until the lower end of the first installation portion is located at the upper end of the first joint rod, and after this lowering, the first with respect to the first installation portion. The joint portion of the upper end portion of the joint rod is aligned, and each of the installation portions is further lowered to insert the joint portion of the first joint rod into the first installation portion. The first joint rod installation step of installing the joint rod in the first installation portion, and
After installing the first joint rod in the first installation portion in the first joint rod installation step, the first spacer is removed from the first support portion, and the lower end of the second installation portion is removed. Each of the installation portions is lowered until is located at the upper end of the second joint rod, and after this lowering, the joint portion of the upper end portion of the second joint rod is aligned with the second installation portion. At the same time, each of the installation portions is further lowered, the joint portion of the second joint rod is inserted into the second installation portion, and the second joint rod is installed in the second installation portion. The second joint rod installation process and
A method of installing a joint rod, which is characterized by having.
掘削・撹拌ロッドとこの掘削・撹拌ロッドに接続されている継ロッドを備えて構成されている第1の回転部材が設置され、上下方向に移動自在である第1の設置部と、前記第1の回転部材と同様に構成されている第2の回転部材が設置され、前記第1の設置部とともに上下方向に移動位置決め自在である第2の設置部とを備え、前記各設置部のそれぞれに装着された各回転部材のそれぞれを回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良装置から、請求項1〜請求項3のいずれか1項に記載のロッドスタンドを用いて前記継ロッドを取り外す継ロッド取り外し方法において、
前記各設置部のそれぞれに継ロッドが設置されている状態で、前記地盤改良装置の第1の設置部を前記第1の支持部の上側に配置し、前記地盤改良装置の第2の設置部を第2の支持部の上側に配置し、この配置後に、前記第1の継ロッドの下端が前記第1の支持部の上端のところに位置するまで、前記各設置部を下降し、この下降後に、前記第1の支持部に対する前記第1の継ロッドの下端部の位置合わせを行う第1の位置合わせ工程と、
前記第1の位置合わせ工程で前記第1の継ロッドの下端部の位置合わせを行った後、前記各設置部をさらに下降し、前記第1の継ロッドの下端部を前記第1の支持部に係合させる第1の係合工程と、
前記第1の係合工程で前記第1の継ロッドの下端部を前記第1の支持部に係合させた後、前記第2の継ロッドの下端が前記第2の支持部の上端のところに位置するまで、前記各設置部をさらに下降し、この下降後に、前記第2の支持部に対する前記第2の継ロッドの下端部の位置合わせを行う第2の位置合わせ工程と、
前記第2の位置合わせ工程で前記第2の継ロッドの下端部の位置合わせを行った後、前記各設置部をさらに下降し、前記第2の継ロッドの下端部を前記第2の支持部に係合させる第2の係合工程と、
前記第2の係合工程で前記第2の継ロッドの下端部を前記第2の支持部に係合させた後、前記各継ロッドの下端が前記各支持部の下端のところに位置するまで、前記各設置部をさらに下降し、この下降後に、前記各設置部から前記各継ロッドを取り外す取り外し工程と、
を有することを特徴とする継ロッド取り外し方法。
A first installation portion on which a first rotating member configured to include an excavation / stirring rod and a joint rod connected to the excavation / stirring rod is installed and is movable in the vertical direction, and the first installation portion. A second rotating member, which is configured in the same manner as the rotating member of the above, is installed, and is provided with a second installation portion that can be moved and positioned in the vertical direction together with the first installation portion. Any one of claims 1 to 3 from a ground improvement device that excavates the ground by rotating and descending each of the mounted rotating members to improve the ground by mixing and stirring the ground improvement material. In the method of removing the joint rod for removing the joint rod using the rod stand described in the section,
With the joint rods installed in each of the installation portions, the first installation portion of the ground improvement device is arranged above the first support portion, and the second installation portion of the ground improvement device is arranged. Is placed above the second support, and after this placement, each installation is lowered until the lower end of the first joint rod is located at the upper end of the first support. Later, a first alignment step of aligning the lower end portion of the first joint rod with respect to the first support portion, and
After aligning the lower end portion of the first joint rod in the first alignment step, each installation portion is further lowered, and the lower end portion of the first joint rod is referred to as the first support portion. The first engagement step to engage with
After engaging the lower end of the first joint rod with the first support portion in the first engagement step, the lower end of the second joint rod is at the upper end of the second support portion. A second alignment step of further lowering each of the installation portions until the position is located, and then aligning the lower end portion of the second joint rod with respect to the second support portion.
After aligning the lower end portion of the second joint rod in the second alignment step, each of the installation portions is further lowered, and the lower end portion of the second joint rod is the second support portion. The second engagement step to engage with
After engaging the lower end of the second joint rod with the second support portion in the second engagement step, until the lower end of each joint rod is located at the lower end of each support portion. , The removal step of further lowering each of the installation parts and removing each of the joint rods from each of the installation parts after the lowering.
A method for removing a joint rod, which is characterized by having.
掘削・撹拌ロッドとこの掘削・撹拌ロッドに接続されている継ロッドとで構成されている第1の回転部材が設置され、上下方向に移動自在である第1の設置部と、前記第1の回転部材と同様に構成されている第2の回転部材が設置され、前記第1の設置部とともに上下方向に移動位置決め自在である第2の設置部とを備え、前記各設置部のそれぞれに装着された各回転部材のそれぞれを回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良装置を用いた地盤改良方法において、
ベッセルに格納されている複数本の継ロッドを、請求項5または請求項6に記載の吊り装置を用いて、請求項2または請求項3の記載のロッドスタンドに設置し、この設置されている各継ロッドを1本ずつ、請求項7または請求項8に記載の継ロッド設置方法で前記地盤改良装置の各設置部のそれぞれに設置する継ロッド設置工程と、
前記継ロッド設置工程で継ロッドを各設置部のそれぞれに設置した後、前記各設置部のそれぞれに装着された各回転部材のそれぞれを回転させて下降することで地盤を掘削し地盤改良材を混ぜて撹拌することで地盤を改良する地盤改良工程と、
前記地盤改良工程で地盤改良をした後、前記地盤改良装置の各設置部を上昇させて前記継ロッドを前記地盤改良がされた穴から抜き、請求項9に記載の継ロッド取り外し方法で前記地盤改良装置の各設置部のそれぞれから継ロッドを取り外す取り外し工程と、
を有することを特徴とする地盤改良方法。
A first rotating member composed of an excavation / stirring rod and a joint rod connected to the excavation / stirring rod is installed, and a first installation portion that is movable in the vertical direction and the first installation portion described above. A second rotating member having the same structure as the rotating member is installed, and is provided with a second installation portion that can move and position in the vertical direction together with the first installation portion, and is attached to each of the installation portions. In a ground improvement method using a ground improvement device that excavates the ground by rotating each of the rotating members and descending to improve the ground by mixing and stirring the ground improvement material.
A plurality of joint rods stored in the vessel are installed on the rod stand according to claim 2 or 3 by using the suspension device according to claim 5 or 6. A joint rod installation step of installing each joint rod one by one at each installation portion of the ground improvement device by the joint rod installation method according to claim 7 or 8.
After installing the joint rod in each of the installation parts in the joint rod installation process, the ground is excavated by rotating and descending each of the rotating members mounted on each of the installation parts to excavate the ground improvement material. A ground improvement process that improves the ground by mixing and stirring,
After the ground is improved in the ground improvement step, each installation portion of the ground improvement device is raised to pull out the joint rod from the hole where the ground improvement has been made, and the joint rod removal method according to claim 9 is used to remove the joint rod. The removal process of removing the joint rod from each installation part of the improved device,
A ground improvement method characterized by having.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6098097A (en) * 1983-11-04 1985-06-01 株式会社竹中土木 Drilling rod splicing method of multi-axis drill
JPH04130389U (en) * 1991-05-27 1992-11-30 日本基礎技術株式会社 Drill pipe conveying device
JPH10317422A (en) * 1997-05-14 1998-12-02 Seiko Kogyo Kk Method for connecting vertical shaft in multi-shaft excavating machine
JPH11117348A (en) * 1997-10-09 1999-04-27 Seiko Kogyo Kk Method for excavating through connection to multiaxis rotary shaft group, and for connection of multiaxis rotary shaft group
JP2004052409A (en) * 2002-07-22 2004-02-19 Koonan Machinery:Kk Earth auger screw washing device
JP2014125765A (en) * 2012-12-26 2014-07-07 Fudo Tetra Corp Relay shaft for digging agitation shaft
JP2015178721A (en) * 2014-03-19 2015-10-08 日本車輌製造株式会社 Rod for construction machine
JP2017166134A (en) * 2016-03-14 2017-09-21 株式会社オーケーソイル Fixing device for excavation shaft member

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6098097A (en) * 1983-11-04 1985-06-01 株式会社竹中土木 Drilling rod splicing method of multi-axis drill
JPH04130389U (en) * 1991-05-27 1992-11-30 日本基礎技術株式会社 Drill pipe conveying device
JPH10317422A (en) * 1997-05-14 1998-12-02 Seiko Kogyo Kk Method for connecting vertical shaft in multi-shaft excavating machine
JPH11117348A (en) * 1997-10-09 1999-04-27 Seiko Kogyo Kk Method for excavating through connection to multiaxis rotary shaft group, and for connection of multiaxis rotary shaft group
JP2004052409A (en) * 2002-07-22 2004-02-19 Koonan Machinery:Kk Earth auger screw washing device
JP2014125765A (en) * 2012-12-26 2014-07-07 Fudo Tetra Corp Relay shaft for digging agitation shaft
JP2015178721A (en) * 2014-03-19 2015-10-08 日本車輌製造株式会社 Rod for construction machine
JP2017166134A (en) * 2016-03-14 2017-09-21 株式会社オーケーソイル Fixing device for excavation shaft member

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