JP2017067090A - Base for underground pipe and method for re-burying underground pipe - Google Patents

Base for underground pipe and method for re-burying underground pipe Download PDF

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JP2017067090A
JP2017067090A JP2015189942A JP2015189942A JP2017067090A JP 2017067090 A JP2017067090 A JP 2017067090A JP 2015189942 A JP2015189942 A JP 2015189942A JP 2015189942 A JP2015189942 A JP 2015189942A JP 2017067090 A JP2017067090 A JP 2017067090A
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buried pipe
placement
height
tool
buried
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功輔 斉藤
Kosuke Saito
功輔 斉藤
潤 川北
Jun Kawakita
潤 川北
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Taisei Corp
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Taisei Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

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Abstract

PROBLEM TO BE SOLVED: To prevent floating of an underground pipe in re-burying the underground pipe.SOLUTION: A base for underground pipe includes at least: a column; a mounting tool attached to the column and capable of mounting an underground pipe thereon; a fixture configured to position the underground pipe to be mounted on the mounting tool; a receiving tool provided so as to be swollen in a plane direction from each column. With the base, floating of the underground pipe can be prevented.SELECTED DRAWING: Figure 1

Description

本発明は、埋設管の埋め戻し時に該埋設管の浮き上がりを防止するための埋設管用架台、および該埋設管用架台を用いた埋設管の埋め戻し方法に関する。   The present invention relates to a buried pipe pedestal for preventing the buried pipe from floating when the buried pipe is backfilled, and a buried pipe refilling method using the buried pipe pedestal.

流動化処理土などの埋め戻し材にて埋設管の埋め戻しを行う場合、埋め戻し材による浮力が働き、埋設管の浮き上がりや横ずれの問題が発生する場合がある
特に、埋設管が下水管である場合、埋設管の勾配が非常に重要となるため、少しの変位も許されない場合が多い。
特に、流動化処理土は密度の大きい液体であるため、埋設管の浮き上がりに対する対策を行う必要があった。 When the buried pipe is backfilled with backfill material such as fluidized soil, buoyancy due to the backfill material may work, causing problems such as floating of the buried pipe and lateral displacement. In some cases, the slope of the buried pipe is so important that no displacement is often allowed.
In particular, since the fluidized soil is a liquid having a high density, it is necessary to take measures against the floating of the buried pipe.

従来の対策としては、以下の各特許文献に記載の方法が知られている。
（方法１）打設量の調整
特許文献１に係る方法では、流動化処理土の打設回数を減らし、１回あたり打設時に作用する浮力を自重以下とすることで、埋設管の浮き上がりを防止している。
（方法２）横断杆および縦杆による固定
特許文献２に係る方法では、埋設管より上方の土留壁間に横断杆を設け、該横断杆と交差するように設置する縦杆でもって埋設管を位置決めすることで、設管の浮き上がりを防止している。
（方法３）塊状体による固定
特許文献３に係る方法では、埋設管に貫通孔を設け、埋設管の内部から外部へとグラウト材を噴射してなる塊状体を形成することで、埋設管の浮き上がりを防止している。
（方法４）アンカーによる固定
埋設管下部にアンカーを設置し、浮力に対する反力を得る方法がある。
アンカーを設置する場合は、埋設管下部の均しコンクリート、もしくは地山に直接アンカーを設置する。 As conventional measures, methods described in the following patent documents are known.
(Method 1) Adjustment of the placement amount In the method according to Patent Document 1, the number of times of placing the fluidized soil is reduced, and the buoyancy acting at the time of placement is reduced to less than its own weight, thereby lifting the buried pipe. It is preventing.
(Method 2) Fixing with a crossing gutter and vertical gutter In the method according to Patent Document 2, a crossing gutter is provided between the retaining walls above the buried pipe, and the buried pipe is installed with a vertical gutter installed so as to cross the crossing gutter. Positioning prevents the pipes from floating up.
(Method 3) Fixing by a lump body In the method according to Patent Document 3, a through hole is provided in the buried pipe, and a lump body is formed by injecting grout material from the inside of the buried pipe to the outside. Prevents lifting.
(Method 4) Fixing with an anchor There is a method of obtaining a reaction force against buoyancy by installing an anchor at the bottom of an embedded pipe.
When installing an anchor, install the anchor directly on the leveled concrete below the buried pipe or on the ground.

特開２００２−２０６６6８号公報Japanese Patent Laid-Open No. 2002-206668 特開２００６−１８３７７９号公報JP 2006-183779 A 特開２０１３−１６４１０３号公報JP 2013-164103 A

しかし、前記した各特許文献に記載の方法では、以下の問題がある。
（１）方法１の場合、打設回数を増やすのは施工上の手間が大きい。また、大断面などの浮力が大きい場合は、数センチずつしか埋め戻せず、現実的でない。
（２）方法２の場合、横断杆や縦杆の設置作業に手間がかかる。また、基礎下の地盤条件（例えば埋設物、礫層）や、空頭制限、障害物等の条件によって、埋設管の直上に、横断杆や縦杆を設置することもできない場合には、本方法を適用できない。
（３）方法３の場合、埋設管の周囲が既に埋め戻された状態からの液状化現象による浮き上がりを防止するための事後対策であり、埋め戻し材の打設による浮き上がり防止には、本方法を適用できない。
（４）方法４の場合、埋設管設置時に、均しコンクリートを必ず打設しなければならない。また、大断面の埋設管を設置する場合はアンカーの仕様が大きくなり不経済である。地山にアンカーを設置する場合は、地山の状況に応じたアンカーを設置する必要があり、反力にばらつきが出る可能性があり確実ではない。 However, the methods described in the above-mentioned patent documents have the following problems.
(1) In the case of Method 1, it takes a lot of work to increase the number of placements. In addition, when the buoyancy such as a large cross section is large, it can be backfilled only by several centimeters, which is not realistic.
(2) In the case of method 2, it takes time to install the crossing and vertical fences. This method is also used when it is not possible to install a crossing or vertical shaft directly above the buried pipe due to ground conditions under the foundation (for example, buried objects, gravel layers), sky head restrictions, obstacles, etc. Is not applicable.
(3) In the case of Method 3, this method is a post-measure to prevent lifting due to the liquefaction phenomenon from the state in which the periphery of the buried pipe has already been backfilled. Is not applicable.
(4) In the case of Method 4, it is necessary to cast leveled concrete when installing the buried pipe. Moreover, when installing a buried pipe with a large cross section, the specification of the anchor becomes large, which is uneconomical. When installing an anchor on a natural ground, it is necessary to install an anchor according to the situation of the natural ground, and the reaction force may vary, which is not certain.

本願発明は、埋設管の埋め戻し時に、該埋設管の浮き上がりを防止することが可能な手段の提供を目的の一つとする。   An object of the present invention is to provide means capable of preventing the buried pipe from being lifted when the buried pipe is backfilled.

上記課題を解決すべくなされた本願の第１発明は、埋設管の埋め戻し時に、該埋設管の浮き上がりを防止するための埋設管用架台であって、支柱と、前記支柱に取り付けて、該埋設管を載置可能な、載置具と、前記載置具に載せた埋設管を、該載置具上に位置決めする、固定具と、前記各支柱から平面方向に張り出すように設けた、受け具と、を少なくとも具備することを特徴とする。
また、本願の第２発明は、埋設管の埋め戻し時に、該埋設管の浮き上がりを防止するための方法であって、（ａ）埋め戻し予定箇所に、請求項１に記載の埋設管用架台を配置して、該埋設管用架台に前記埋設管を載置および固定する工程、（ｂ）前記埋設管よりも下方の埋め戻し予定箇所に、埋め戻し材を一次打設する工程、（ｃ）前記一次打設の埋め戻し材が硬化してから、残りの埋め戻し予定箇所に、埋め戻し材を二次打設する工程、を有し、前記一次打設の打設高さは、前記二次打設の際に、前記埋設管が浮力で浮き上がらない状態となる高さに設定することを特徴とする。
また、本願の第３発明は、前記第２発明において、前記一次打設の打設高さを、前記埋設管用架台をアンカーと見立てたとき、前記二次打設の際に生じる前記埋設管の浮力からなる前記埋設管用架台の引き抜き荷重に、前記一次打設時の埋め戻し材が抵抗しうる高さとしたことを特徴とする。 The first invention of the present application to solve the above-mentioned problems is a buried pipe pedestal for preventing the buried pipe from being lifted when the buried pipe is backfilled. A placement tool capable of placing a tube, and an embedded tube placed on the placement tool, which is positioned on the placement tool, are provided so as to project in a plane direction from the respective support columns, And a receiving tool.
Further, the second invention of the present application is a method for preventing the buried pipe from being lifted when the buried pipe is backfilled, and (a) the buried pipe pedestal according to claim 1 is provided at a place to be backfilled. Placing and fixing the buried pipe on the buried pipe pedestal, (b) placing a backfill material first in a planned backfill position below the buried pipe, (c) A step of secondarily placing the backfill material in the remaining planned backfill portion after the backfill material of the primary placement has hardened, and the placement height of the primary placement is determined by the secondary placement In placing, the buried pipe is set to a height at which the buried pipe is not lifted by buoyancy.
Further, according to a third invention of the present application, in the second invention, when the placement height of the primary placement is regarded as an anchor for the buried pipe pedestal, It is characterized in that the backfilling material at the time of the primary placement can resist the pull-out load of the buried pipe mount made of buoyancy.

本願発明によれば、以下の効果を奏する。
（１）簡易な方法で、埋設管の浮き上がりと横ずれを防止することができる。
（２）埋め戻し材の打設回数が最低２回で済むため、施工の手間が大きくなることもない。
（３）固定された埋設管用架台に埋設管を載置するため、埋設管の高さ調整が容易である。 The present invention has the following effects.
(1) It is possible to prevent the buried pipe from being lifted and laterally displaced by a simple method.
(2) Since the number of times of placing the backfill material is at least twice, the labor of construction does not increase.
(3) Since the buried pipe is placed on the fixed buried pipe mount, the height of the buried pipe can be easily adjusted.

実施例１に係る埋設管用架台の概略斜視図。1 is a schematic perspective view of a buried pipe mount according to Embodiment 1. FIG. 実施例２に係る埋設管の埋め戻し方法の工程（１）を示す概略断面図。FIG. 6 is a schematic cross-sectional view showing a step (1) of the buried pipe refilling method according to the second embodiment. 実施例２に係る埋設管の埋め戻し方法の工程（２）を示す概略断面図。FIG. 6 is a schematic cross-sectional view showing a step (2) of the buried pipe refilling method according to the second embodiment. 実施例２に係る埋設管の埋め戻し方法の工程（３）を示す概略断面図。FIG. 6 is a schematic cross-sectional view showing a step (3) of the buried pipe refilling method according to the second embodiment. 実施例３に係る必要打設高さの算出例を示す概略断面図。FIG. 6 is a schematic cross-sectional view showing an example of calculating the required placement height according to the third embodiment.

以下、図面を参照しながら、本発明の実施例について説明する。   Embodiments of the present invention will be described below with reference to the drawings.

＜１＞埋設管用架台の全体構成
本発明に係る埋設管用架台の一例について説明する。
本発明に係る埋設管用架台は、埋め戻す予定の埋設管を載置して位置決めするための架台である。
図１に示す埋設管用架台Ａは、支柱１０、載置具２０、固定具３０および受け具４０を少なくとも具備して構成する。
以下、各構成部材について説明する。 <1> Overall configuration of buried pipe mount An example of the buried pipe mount according to the present invention will be described.
The buried pipe pedestal according to the present invention is a pedestal for placing and positioning a buried pipe to be backfilled.
The buried pipe pedestal A shown in FIG. 1 includes at least a support column 10, a mounting tool 20, a fixing tool 30, and a receiving tool 40.
Hereinafter, each component will be described.

＜２＞支柱
支柱１０は、載置具２０を所定の高さに設定するための部材である。
支柱１０は、埋め戻し材の打設予定箇所（埋め戻し予定箇所）に立設する長手状の部材である。
支柱１０には、山形鋼、溝形鋼（Ｃ形鋼）などの形鋼や、鋼棒などを用いることができる。図１では支柱１０に山形鋼を用いている。 <2> Column The column 10 is a member for setting the mounting tool 20 to a predetermined height.
The support | pillar 10 is a longitudinal member standingly arranged in the planned placement place (backfill planned place) of the backfill material.
For the support column 10, a shape steel such as an angle steel or a channel steel (C-shape steel), a steel bar, or the like can be used. In FIG. 1, angle steel is used for the support 10.

＜３＞載置具
載置具２０は、埋設管を載置するための部材である。
載置具２０は、棒状、板状その他の公知形状を呈する部材を用いることができる。
載置具２０は、支柱１０の長手方向と交差するように、一端を前記支柱１０に連結する。支柱１０と載置具２０との連結機構には、ボルトナット等の締結具や、溶接など周知の連結手段を用いることができる。 <3> Placement tool The placement tool 20 is a member for placing the buried pipe.
The mounting tool 20 can use a member having a rod shape, a plate shape, or other known shapes.
The mounting tool 20 connects one end to the support column 10 so as to intersect the longitudinal direction of the support column 10. For the connection mechanism between the column 10 and the mounting tool 20, fasteners such as bolts and nuts, and well-known connection means such as welding can be used.

＜３．１＞載置具の高さ調整機構
支柱１０と載置具２０との連結箇所は、支柱１０の任意の位置に変更自在とすることが望ましい。これは、支柱１０の底部に相当する埋め戻し予定箇所の底面から埋設管までの高さが現場によって異なるため、埋設管用架台Ａの汎用性を高めるためである。
載置具２０の取付箇所を変更自在とする手段としては、例えば前記支柱１０の高さ方向に間隔を設けて貫通孔を複数設けておき、この貫通孔のうち何れかの貫通孔を介して、載置具２０を締結具で連結する方法や、支柱１０の長手方向に長穴を設けて、該長穴上を載置具２０が摺動して任意の位置で固定可能に構成する方法などが考えられる。 <3.1> Height Adjustment Mechanism of Placement Tool It is desirable that the connecting portion between the support column 10 and the installation tool 20 can be changed to an arbitrary position of the support column 10. This is because the height from the bottom surface of the portion to be backfilled corresponding to the bottom portion of the support column 10 to the buried pipe varies depending on the site, so that the versatility of the buried pipe mount A is increased.
As a means for making the mounting position of the mounting tool 20 freely changeable, for example, a plurality of through holes are provided at intervals in the height direction of the support column 10, and any one of the through holes is interposed through the through hole. A method of connecting the mounting tool 20 with a fastener, or a method in which a long hole is provided in the longitudinal direction of the column 10 and the mounting tool 20 slides on the long hole and can be fixed at an arbitrary position. Etc. are considered.

＜４＞固定具
固定具３０は、埋設管の位置を固定するための部材である。
固定具３０は、載置具２０に乗せた埋設管の位置を固定できる範囲で公知の手段を用いることができる。
図１では、固定具３０に、載置具２０の長手方向の二点間を繋ぐワイヤーを用い、該ワイヤーを埋設管に巻き付けて、載置具２０上に拘束している。 <4> Fixing tool The fixing tool 30 is a member for fixing the position of the buried pipe.
As the fixing tool 30, known means can be used as long as the position of the buried pipe placed on the mounting tool 20 can be fixed.
In FIG. 1, a wire that connects two points in the longitudinal direction of the mounting tool 20 is used as the fixing tool 30, and the wire is wound around an embedded tube and restrained on the mounting tool 20.

＜５＞受け具
受け具４０は、埋め戻し材の打設後に、該埋め戻し材の荷重を受けたり、支柱１０を埋め戻し材内に埋め込んだアンカーと見立てたときの先端部として機能させたりするための部材である。
受け具４０は、支柱１０から平面方向に張り出すように設けた、平板状の部材や、該平板状の縁部を上方にその他の公知形状からなる部材で構成することができる。
支柱１０の高さ方向における受け具４０の位置は特段限定しないが、支柱１０の下端に受け具４０を設けると、受け具が支柱の台座としても機能する点で好ましい。図１では、受け具４０に上方に折曲部分を向けるように配置する溝形鋼を用いており、該溝形鋼のウェブの略中央に、支柱１０の下端を接合している。 <5> Receiver The receiver 40 receives a load of the backfilling material after placing the backfilling material, or functions as a tip when the column 10 is regarded as an anchor embedded in the backfilling material. It is a member for doing.
The receiving device 40 can be configured by a flat plate-like member provided so as to protrude from the support column 10 in the plane direction, or a member having another known shape with the flat plate-like edge portion upward.
The position of the receiving member 40 in the height direction of the support column 10 is not particularly limited, but it is preferable that the receiving device 40 is provided at the lower end of the support column 10 in that the receiving device also functions as a pedestal for the support column. In FIG. 1, a grooved steel is used that is disposed so that the bent portion is directed upward to the receiving tool 40, and the lower end of the support column 10 is joined to the approximate center of the web of the grooved steel.

次に、図２乃至４を参照しながら、本発明に係る埋設管用架台の使用方法の一例について説明する。
なお、後述する工程（ａ）および（ｂ）は、順序を問わずに実施することができる。 Next, an example of a method for using the buried pipe mount according to the present invention will be described with reference to FIGS.
In addition, process (a) and (b) mentioned later can be implemented regardless of an order.

＜１＞工程（ａ）：架台の設置・埋設管の固定
図２に、埋め戻し方法の工程（ａ）を示す。
まず、埋め戻し予定箇所に、埋設管用架台Ａを配置する。
本実施例に係る埋設管用架台Ａは、埋設管の両側に配する一組の支柱１０（１０ａ、１０ｂ）と、該一組の支柱１０間を繋ぐように取り付ける載置具２０と、前記載置具２０に載せた埋設管Ｘを、該載置具２０上に位置決めする、固定具３０と、前記各支柱１０から平面方向に張り出すように設けた、受け具４０とを少なくとも具備する。
実施例１に係る埋設管用架台Ａと異なり、支柱１０を埋設管Ｘの両側に設けて、載置具２０を一組の支柱１０間に架け渡すように構成したのは、埋設管Ｘの位置決めをより安定して行うためである。 <1> Step (a): Installation of Stand / Fixing of Buried Pipe FIG. 2 shows the step (a) of the backfilling method.
First, the buried pipe pedestal A is arranged at the place to be backfilled.
The buried pipe mount A according to the present embodiment includes a pair of support columns 10 (10a, 10b) arranged on both sides of the embedded pipe, and a mounting tool 20 attached so as to connect the set of support columns 10 to each other. At least a fixing tool 30 for positioning the buried tube X placed on the mounting tool 20 on the mounting tool 20 and a receiving tool 40 provided so as to project from each of the columns 10 in the plane direction are provided.
Unlike the buried pipe gantry A according to the first embodiment, the columns 10 are provided on both sides of the buried pipe X, and the mounting tool 20 is bridged between the pair of pillars 10 because of the positioning of the buried pipe X. It is for performing more stably.

埋設管用架台Ａを配置した後、載置具２０の高さを調整してから載置具２０に埋設管Ｘが載置するよう、固定具３０で載置具２０と埋設管Ｘとを固定する。
このとき、埋設管Ａの側部に、キャンバー３２などを設置してもよい。 After placing the buried pipe mount A, the mounting tool 20 and the buried pipe X are fixed by the fixture 30 so that the buried pipe X is placed on the placing tool 20 after the height of the placing tool 20 is adjusted. To do.
At this time, a camber 32 or the like may be installed on the side of the buried pipe A.

＜２＞工程（ｂ）：埋め戻し材の一次打設
図３に、埋め戻し方法の工程（ｂ）を示す。
次に、埋め戻し箇所へと、埋め戻し材５０（５０ａ）の一次打設を行う。
埋め戻し材５０は、流動化処理土などを想定する。
この一次打設における、埋め戻し材５０ａの打設高さ（必要打設高さ）は、後述する埋め戻し材５０の追加打設の際に、埋設管Ｘの浮き上がりが防止できる程度であればよい。
以下、前記必要打設高さの算出例を示す。 <2> Step (b): Primary placement of backfill material FIG. 3 shows a step (b) of the backfill method.
Next, primary placement of the backfill material 50 (50a) is performed to the backfill location.
The backfill material 50 is assumed to be fluidized soil.
In this primary placement, the placement height (required placement height) of the backfill material 50a is such that the buried pipe X can be prevented from being lifted when the backfill material 50 is additionally placed as will be described later. Good.
Hereinafter, an example of calculating the required placement height will be shown.

＜２．１＞必要打設高さの算出例
この必要打設高さは、埋設管Ｘの体積、埋め戻し材５０の密度、支柱１０の抵抗面積、支柱１０の設置本数などの諸条件によって算出することができる。
以下、計算に用いるパラメータを示す。
Ｖ［ｍ３］ ：埋設管の体積
ρ［ｋｇ／ｍ３］ ：埋め戻し材の密度
ｇ［ｍ／ｓ２］ ：重力加速度
Ｐ［ｋｇ・ｍ／ｓ２］ ：埋設管の浮力
（Ｐ＝Ｖ×ρ×ｇ）
Ｓ［ｍ２］ ：受け具の抵抗面積（受け具の平面視面積）
Ｈ［ｍ］ ：必要打設高さ
（但し、埋設管下端までの高さ未満とする。）
ｎ ：支柱の本数
Ｗ［ｋｇ・ｍ／ｓ２］ ：支柱上に載荷する埋め戻し材の合計重量
（Ｗ＝Ｓ×Ｈ×ｇ×ｎ） <2.1> Calculation Example of Required Placing Height The necessary casting height depends on various conditions such as the volume of the buried pipe X, the density of the backfill material 50, the resistance area of the column 10, and the number of columns 10 installed. Can be calculated.
The parameters used for the calculation are shown below.
V [m 3 ]: Volume of buried pipe ρ [kg / m 3 ]: Density of backfill material g [m / s 2 ]: Gravity acceleration P [kg · m / s 2 ]: Buoyancy of buried pipe
(P = V × ρ × g)
S [m 2 ]: Resistance area of the receiver (plan view area of the receiver)
H [m]: Required placement height
(However, it should be less than the height to the bottom of the buried pipe.)
n: Number of columns W [kg · m / s 2 ]: Total weight of backfill material loaded on columns
(W = S × H × g × n)

このとき、各受け具４０の上方における重量空間６０内の埋め戻し材５０の合計重量（Ｗ）が、埋設管Ｘの浮力（Ｐ）以上となるように、支柱の本数（ｎ）、受け具の抵抗面積（Ｓ）、必要打設高さ（Ｈ）などの諸条件を適宜設定すれば、後述する追加打設時において、埋設管Ｘの浮き上がりは生じないこととなる。   At this time, the number of struts (n), the receivers, so that the total weight (W) of the backfill material 50 in the weight space 60 above each receiver 40 is equal to or greater than the buoyancy (P) of the buried pipe X. If various conditions such as the resistance area (S) and the required placement height (H) are appropriately set, the buried pipe X will not be lifted during the additional placement described later.

＜３＞工程（ｃ）：埋め戻し材の追加打設
図４に、埋め戻し方法の工程（ｃ）を示す。
前記した初期打設による埋め戻し材５０ａが硬化して、受け具４０の上方の重量体７０の重量が該受け具４０で載荷する状態となってから、残りの埋め戻し材５０（５０ｂ）の打設（追加打設）を行う。
このとき、埋設管Ｘ周辺に埋め戻し材５０ｂが達すると、埋設管Ｘは、埋め戻し材５０ｂによる浮力で浮き上がろうとする。
しかし、埋設管Ｘは、該埋設管Ｘと固定してある埋設管用架台Ａ、および該埋設管用架台Ａの受け具４０の上方に存する重量空間６０内の埋め戻し材５０ａと実質的に一体化しているため、見かけ上、埋設管Ｘに、浮力以上の重量物７０がつり下がった状態となっている。よって、埋設管Ｘが浮き上がることはない。
また、埋設管Ｘは、固定具３０や、キャンバー３２によって載置具２０に固定してあるため、埋設管Ｘが横ずれすることも無い。 <3> Step (c): Additional placement of backfill material FIG. 4 shows a step (c) of the backfill method.
After the backfilling material 50a by the above-described initial placement is cured and the weight of the weight body 70 above the receiving device 40 is loaded on the receiving device 40, the remaining backfilling material 50 (50b) is loaded. Perform placement (additional placement).
At this time, when the backfilling material 50b reaches the periphery of the buried pipe X, the buried pipe X tends to float by buoyancy caused by the backfilling material 50b.
However, the buried pipe X is substantially integrated with the buried pipe pedestal A fixed to the buried pipe X and the backfill material 50a in the weight space 60 existing above the receptacle 40 of the buried pipe pedestal A. Therefore, it appears that a heavy object 70 having a buoyancy or more is suspended from the buried pipe X. Therefore, the buried pipe X does not float up.
Moreover, since the buried pipe X is fixed to the placement tool 20 by the fixing tool 30 and the camber 32, the buried pipe X is not laterally displaced.

［必要打設高さの別算出例］
図５を参照しながら、工程（ｂ）に係る一次打設の埋め戻し材の必要打設高さについて、実施例２と異なる算出方法について説明する。
前記必要打設高さは、前記埋設管用架台Ａの支柱１０をアンカーと見立てたとき、前記埋設管Ｘの浮力からなる前記埋設管用架台の引き抜き荷重に、埋め戻し材が抵抗可能な状態の打設高さで算出することができる。
より詳細に説明すると、各支柱１０をアンカーと見立てた際のコーン破壊の許容引張力（Ｐａ）の合計が、埋設管の浮力（Ｐ）よりも大きくなるように公知の計算式で必要打設高さを算出することができる。
コーン破壊とは、支柱１０をアンカーと見立てた際に、支柱１０の引き抜き時に、受け具４０からなる先端部から４５°の角度をもって上方に逆円錐状に伸びる面を破断面８０としてコーン状に破壊する現象である。
本実施例に係る算出方法によっても、工程（ｃ）における追加打設時に、埋設管Ｘの浮き上がりは生じないこととなる。 [Example of calculation of required placement height]
With reference to FIG. 5, a calculation method different from that in Example 2 will be described for the required placement height of the primary placement backfill material according to the step (b).
The required placement height is determined in a state in which the backfilling material can resist the pulling load of the buried pipe pedestal composed of the buoyancy of the buried pipe X when the column 10 of the buried pipe pedestal A is regarded as an anchor. It can be calculated from the installation height.
Explaining in more detail, it is necessary to use a known calculation formula so that the sum of the allowable tensile force (Pa) of the cone fracture when each column 10 is regarded as an anchor is larger than the buoyancy (P) of the buried pipe. The height can be calculated.
Cone fracture is a cone-shaped surface having a fracture surface 80 that extends upward at an angle of 45 ° from the tip of the support 40 when the support 10 is pulled out when the support 10 is regarded as an anchor. It is a phenomenon of destruction.
Even with the calculation method according to the present embodiment, the buried pipe X does not float during the additional placement in the step (c).

Ａ 埋設管用架台
１０ 支柱
２０ 載置具
３０ 固定具
３１ キャンバー
４０ 受け具
５０ 埋め戻し材
６０ 重量空間
７０ 重量物
８０ 破断面
Ｘ 埋設管 A Attached pipe pedestal 10 Strut 20 Mounting tool 30 Fixing tool 31 Camber 40 Receiving tool 50 Backfilling material 60 Weight space 70 Heavy object 80 Broken surface X Embedded pipe

Claims (3)

埋設管用架台であって、
支柱と、
前記支柱に取り付けて、該埋設管を載置可能な、載置具と、
前記載置具に載せた埋設管を、該載置具上に位置決めする、固定具と、
前記各支柱から平面方向に張り出すように設けた、受け具と、
を少なくとも具備することを特徴とする、
埋設管用架台。 A buried pipe mount,
Struts,
A mounting tool that can be mounted on the column and on which the buried pipe can be mounted;
A fixing tool for positioning the buried pipe placed on the mounting device on the mounting device;
A support provided so as to project in a planar direction from each of the columns;
Comprising at least
Underground pipe mount. （ａ）埋め戻し予定箇所に、請求項１に記載の埋設管用架台を配置して、該埋設管用架台に前記埋設管を載置および固定する工程、
（ｂ）前記埋設管よりも下方の埋め戻し予定箇所に、埋め戻し材を一次打設する工程、
（ｃ）前記一次打設の埋め戻し材が硬化してから、残りの埋め戻し予定箇所に、埋め戻し材を二次打設する工程、
を有し、
前記一次打設の打設高さは、前記二次打設の際に、前記埋設管が浮力で浮き上がらない状態となる高さに設定することを特徴とする、
埋設管の埋め戻し方法。 (A) a step of placing the buried pipe pedestal according to claim 1 at a place to be backfilled, and placing and fixing the buried pipe on the buried pipe pedestal;
(B) a step of primarily placing a backfill material at a planned backfill location below the buried pipe;
(C) after the backfill material of the primary placement is hardened, a step of secondary placement of the backfill material in the remaining backfill planned location;
Have
The placement height of the primary placement is set to a height at which the buried pipe is not lifted by buoyancy during the secondary placement,
How to refill buried pipes. 前記一次打設の打設高さを、前記埋設管用架台をアンカーと見立てたとき、前記二次打設の際に生じる前記埋設管の浮力からなる前記埋設管用架台の引き抜き荷重に、前記一次打設時の埋め戻し材が抵抗しうる高さとしたことを特徴とする、請求項２に記載の埋設管の埋め戻し方法。   When the placement height of the primary placement is regarded as an anchor for the buried pipe pedestal, the pulling load of the buried pipe pedestal consisting of the buoyancy of the buried pipe generated during the secondary placement is determined by the primary placement. The backfilling method for a buried pipe according to claim 2, wherein the backfilling material at the time of installation has a height that can be resisted.
JP2015189942A 2015-09-28 2015-09-28 Base for underground pipe and method for re-burying underground pipe Pending JP2017067090A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114413062A (en) * 2022-01-28 2022-04-29 廊坊师范学院 Method for installing and fixing existing pipe gallery pipeline

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114413062A (en) * 2022-01-28 2022-04-29 廊坊师范学院 Method for installing and fixing existing pipe gallery pipeline
CN114413062B (en) * 2022-01-28 2024-05-14 廊坊师范学院 Method for installing and fixing existing pipe rack pipeline

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