JP3486075B2 - Vibration compaction device and vibration rod - Google Patents
Vibration compaction device and vibration rodInfo
- Publication number
- JP3486075B2 JP3486075B2 JP14213997A JP14213997A JP3486075B2 JP 3486075 B2 JP3486075 B2 JP 3486075B2 JP 14213997 A JP14213997 A JP 14213997A JP 14213997 A JP14213997 A JP 14213997A JP 3486075 B2 JP3486075 B2 JP 3486075B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- vibration
- ground
- vibrating rod
- jet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、地盤、特に飽和し
た緩い砂地盤等、地震によって液状化しやすい軟弱地盤
を振動により締固める振動締固め工法のための振動締固
め装置と該振動締固め装置用の振動ロッドに関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating compactor and a vibrating compactor for a vibrating compaction method for compacting by vibration the soft ground that is likely to be liquefied by an earthquake such as ground, especially saturated loose sand ground. For a vibrating rod for a car.
【０００２】[0002]
【従来の技術】人工埋立地等の軟弱地盤を有効利用する
にあたって、その軟弱地盤を改良し、液状化に対する抵
抗性やその地盤の支持力を高めることが一般に行われて
いる。ロッドコンパクション工法は、そのような地盤改
良工法のうちのひとつで、振動ロッドを地中に挿入後、
その振動ロッドを地中で、例えば上下に振動させること
で、地盤を締固める。この時、振動ロッド周辺では振動
により砂が密に詰まり地下水の存在していた空間が縮小
しようとするので、過剰間隙水圧が発生し、砂間の結合
力が弱まり、該振動ロッド周辺の地盤が液状化すること
がある。そこで、振動ロッド周辺に排水管を配設し、真
空ポンプ等を用いてその排水管から振動ロッド周辺に発
生する水を吸い上げることが行われていた。2. Description of the Related Art In order to effectively use soft ground such as artificial landfill sites, it is generally practiced to improve the soft ground so as to improve its resistance to liquefaction and its bearing capacity. The rod compaction method is one of such ground improvement methods. After inserting the vibrating rod into the ground,
The ground is compacted by vibrating the vibrating rod up and down in the ground, for example. At this time, the sand around the vibrating rod is densely packed due to the vibration, and the space where the groundwater is present tends to shrink, so that excess pore water pressure is generated, the binding force between the sand is weakened, and the ground around the vibrating rod is May liquefy. Therefore, a drain pipe is arranged around the vibrating rod, and water generated around the vibrating rod is sucked up from the drain pipe by using a vacuum pump or the like.
【０００３】ところで、真空ポンプは真空圧を利用して
水を吸い上げるので、その揚水能力の限界は約１０ｍで
あり、１０ｍ以上の深層部を締固める時には振動ロッド
周辺に発生する水を排水することは困難であった。ま
た、真空ポンプを用いて吸水管から水を吸い上げる場
合、例えば、吸水管の吸水口に備えられたフィルターに
細粒分が詰まることによる吸水管の閉塞が発生すること
が避け難い。その結果、吸水能力が低下するので過剰間
隙水圧を除去しながらの振動締固めが困難となり、支持
力の増加等といった地盤改良の効果が十分に得られなか
ったり、振動締固め作業中にフィルター等の吸水部の清
掃を行う必要が生じ施工能率が著しく低下してしまうな
どの問題が生じていた。By the way, since the vacuum pump sucks up water by utilizing vacuum pressure, its pumping capacity has a limit of about 10 m. When compacting a deep layer of 10 m or more, water generated around the vibrating rod should be drained. Was difficult. Further, when water is sucked up from the water absorption tube using a vacuum pump, it is unavoidable that the filter provided at the water absorption port of the water absorption tube is clogged with fine particles to block the water absorption tube. As a result, the water absorption capacity decreases, making it difficult to perform vibration compaction while removing excess pore water pressure, and it is not possible to obtain sufficient ground improvement effects such as an increase in bearing capacity, or to use a filter, etc. during vibration compaction work. There was a problem that it was necessary to clean the water absorption part of the above and the construction efficiency was significantly reduced.
【０００４】[0004]
【発明が解決しようとする課題】本発明の課題は、ロッ
ドコンパクション工法において、１０ｍ以上の深層部の
地盤締固めにおいても、振動によって発生する過剰間隙
水圧を解消することができる振動締固め装置と振動締固
め装置用の振動ロッドを提供することである。また、振
動締固め作業中にフィルターの清掃を行う必要のない振
動締固め装置と振動締固め装置用の振動ロッドを提供す
ることも本発明の課題である。SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration compaction device capable of eliminating excessive pore water pressure generated by vibration even in compaction of a deep layer of 10 m or more in a rod compaction method. A vibration rod for a vibration compaction device. It is also an object of the present invention to provide a vibration compactor and a vibrating rod for the vibration compactor that do not require cleaning of the filter during the vibration compaction operation.
【０００５】[0005]
【課題を解決するための手段】以上の課題を解決すべく
請求項１記載の発明は、起振機の下部に取り付けられた
Ｈ形鋼による振動ロッドと、該振動ロッド近傍に配設さ
れた吸水管及び該吸水管に対して高圧水流を送り込む高
圧ポンプからなる水噴流ポンプとを含む振動締固め装置
であって、前記高圧ポンプからの高圧水流をジェット水
流にするノズルに向けて送り込む第１の吸水管と、前記
ノズルからのジェット水流の通過によって前記振動ロッ
ド周辺の地下水及び砂礫が流入することとなる開口部を
有し、ジェット水流と該開口部に流入する地下水及び砂
礫を地上に送り出す第２の吸水管とを、前記振動ロッド
をなすＨ形鋼のフランジに沿って配設したことを特徴と
する。In order to solve the above-mentioned problems, the invention according to claim 1 is attached to the lower part of a vibrating machine.
A vibrating rod made of H-shaped steel and installed near the vibrating rod.
Water suction pipe and high pressure for sending high-pressure water flow to the water suction pipe.
A vibration compaction device including a water jet pump composed of a pressure pump , wherein the high pressure water flow from the high pressure pump is jetted into water.
A first water suction pipe which is sent toward a nozzle for flowing the water;
The vibrating lock is caused by the passage of the jet water stream from the nozzle.
The opening where groundwater and gravel will flow into
Having jet water and groundwater and sand flowing into the opening
A second water absorption pipe for sending gravel to the ground, the vibrating rod
It is characterized in that it is arranged along the flange of the H-shaped steel forming
To do .
【０００６】このように、起振機の下部に取り付けられ
た振動ロッドと、該振動ロッド近傍に取り付けられた吸
水管と、該吸水管に設けられた開口部から吸水する水噴
流ポンプとを備えてなる振動締固め装置であるので、起
振機に取り付けられた振動ロッドを振動させて地盤を締
固める場合に、前記振動ロッド周辺に過剰間隙水圧が発
生することにより、振動ロッド周辺が液状化し、振動ロ
ッドの振動が地盤に十分伝わらなくなることがあるが、
吸水管の開口部から振動ロッド周辺の水を水噴流ポンプ
によって吸水することによって、前記過剰間隙水圧を解
消し、振動ロッドの振動を地盤に効果的に加えることが
できる。また、水噴流ポンプによる揚水能力は真空ポン
プよりも高く、１０ｍ以上の深層部の振動締固めにあっ
ても、振動ロッド先端部の周辺の水を地上へと揚水する
ことができる。さらに、吸水と同時に混入する砂礫など
の細粒分は、循環する水流とともに地上へ送られるの
で、吸水する開口部にフィルターを備える必要がなく吸
水部の閉塞も生じない。As described above, the vibrating rod attached to the lower part of the vibration exciter, the water absorbing pipe attached near the vibrating rod, and the water jet pump for absorbing water from the opening provided in the water absorbing pipe are provided. Since it is a vibration compaction device consisting of the following, when vibrating the vibrating rod attached to the exciter and compacting the ground, excess pore water pressure is generated around the vibrating rod, causing liquefaction around the vibrating rod. , The vibration of the vibrating rod may not be sufficiently transmitted to the ground,
By absorbing the water around the vibrating rod from the opening of the water absorbing pipe by the water jet pump, the excess pore water pressure can be eliminated and the vibration of the vibrating rod can be effectively applied to the ground. Further, the pumping capacity of the water jet pump is higher than that of the vacuum pump, and the water around the tip of the vibrating rod can be pumped to the ground even in the vibration compaction of the deep layer of 10 m or more. Further, since fine particles such as gravel mixed with water absorption are sent to the ground together with the circulating water flow, it is not necessary to provide a filter at the opening for water absorption, and the water absorption part is not clogged.
【０００７】[0007]
【０００８】[0008]
【０００９】請求項２記載の発明は、振動により地盤を
締固める振動締固め装置のＨ形鋼による振動ロッドであ
って、高圧ポンプからの高圧水流をジェット水流にする
ノズルに向けて送り込む第１の吸水管と、前記ノズルか
らのジェット水流の通過によって振動ロッド周辺の地下
水及び砂礫が流入することとなる開口部を有し、ジェッ
ト水流と該開口部に流入する地下水及び砂礫を地上に送
り出す第２の吸水管とを、前記Ｈ形鋼のフランジに沿っ
て一体的に設けてなることを特徴とする。According to a second aspect of the present invention, there is provided an oscillating rod made of H-shaped steel of an oscillating compaction device for compacting the ground by vibration, wherein a high-pressure water stream from a high-pressure pump is made into a jet water stream.
The first water suction pipe sent toward the nozzle and the nozzle
Under the vibrating rod by the passage of the jet stream
It has an opening through which water and gravel flow, and
Send the groundwater flow and groundwater and gravel flowing into the opening to the ground.
A second water pipe extending along the flange of the H-section steel
It is characterized by being integrally provided .
【００１０】このように、水流ポンプの一部であって振
動ロッド周辺の水を排除するための高圧水流をノズルに
向けて送り込む第１の吸水管と、ジェット水流と振動ロ
ッド周辺の水とを地上に送り出す第２の吸水管とが振動
ロッドに一体的に備えられているので、振動締固め装置
による振動締固め作業において、水噴流ポンプで振動ロ
ッド周辺の水を吸水することによって振動により発生す
る過剰間隙水圧を解消できる。さらに振動ロッドと吸水
管とが一体となっているので、振動ロッド近傍の水を確
実に吸水できる。As described above, the first water suction pipe, which is a part of the water flow pump and sends the high-pressure water flow for removing the water around the vibrating rod toward the nozzle, the jet water flow and the water around the vibrating rod. Since the second water absorption pipe that is sent to the ground is provided integrally with the vibrating rod, it is generated by vibration by absorbing water around the vibrating rod with a water jet pump during vibration compaction work by the vibration compaction device. Excessive pore water pressure can be eliminated. Further, since the vibrating rod and the water absorbing pipe are integrated, water near the vibrating rod can be reliably absorbed.
【００１１】[0011]
【００１２】[0012]
【００１３】[0013]
【発明の実施の形態】以下に、本発明に係る振動締固め
装置、及び、振動ロッドの実施の形態例を図１から図３
に基づいて説明する。先ず、図１は本発明を適用した一
例としての振動締固め装置である。図２は振動ロッドの
先端部を示した図であって、図３は図２中Ｂ部分の拡大
図である。図中、１は振動締固め装置、７は振動ロッ
ド、８は吸水管、２１はノズル、２３は圧縮空気導入部
である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a vibration compaction device and a vibration rod according to the present invention will be described below with reference to FIGS.
It will be described based on. First, FIG. 1 shows a vibration compaction device as an example to which the present invention is applied. 2 is a view showing the tip of the vibrating rod, and FIG. 3 is an enlarged view of a portion B in FIG. In the figure, 1 is a vibration compaction device, 7 is a vibrating rod, 8 is a water absorption pipe, 21 is a nozzle, and 23 is a compressed air introduction part.
【００１４】本実施の形態例での振動締固め装置１は、
地盤上で装置全体を支えるベース車両２と、該ベース車
両２に下端を軸支され、振動固締めの際にはベース車両
２に備えられたバックステー３によって地盤にほぼ垂直
に起伏されるリーダー４と、ベース車両２に設置された
クレーンのワイヤ５によってリーダー４上方から吊下げ
られ、該リーダー４に沿って移動可能になっている起振
機６と、前記起振機６の下方に取り付けられた振動ロッ
ド７と、該振動ロッド７の長手方向に沿って配設された
吸水管８と、前記吸水管８を通して振動ロッド７の先端
の周辺の水を吸い上げる水噴流ポンプ等から概略構成さ
れている。The vibration compaction device 1 according to the present embodiment is
A base vehicle 2 that supports the entire device on the ground, and a leader whose lower end is pivotally supported by the base vehicle 2 and which is undulated almost vertically to the ground by a back stay 3 provided on the base vehicle 2 when vibration is fastened. 4, an exciter 6 suspended from above the leader 4 by a wire 5 of a crane installed in the base vehicle 2, and movable along the leader 4, and mounted below the exciter 6. And a water absorbing pipe 8 arranged along the longitudinal direction of the vibrating rod 7, and a water jet pump or the like for sucking water around the tip of the vibrating rod 7 through the water absorbing pipe 8. ing.
【００１５】起振機６は、振動ロッド７を地中に圧入す
る際に振動ロッド７に上から力を加え、振動ロッド７を
地中で振動させる際に振動ロッド７に振動を加えるもの
である。The vibrator 6 applies a force from above to the vibrating rod 7 when the vibrating rod 7 is press-fitted into the ground, and vibrates the vibrating rod 7 when vibrating the vibrating rod 7 in the ground. is there.
【００１６】本実施の形態例での振動ロッド７は、図２
に示すようにＨ型鋼９に水噴流ポンプの一部を配設した
ものであって、吸水管８を保護するために前記Ｈ型鋼９
の上部から該Ｈ型鋼９のフランジ９ａに沿って配設され
た２本の吸水管プロテクター１０ａ，１０ｂと、該吸水
管プロテクター１０ａ，１０ｂ中に配設された吸水管８
と、地上のコンプレッサー（不図示）からの圧縮空気を
送る圧縮空気導入管１５等で概略構成されている。ま
た、本実施の形態例での水噴流ポンプは、前記吸水管８
と、後述するノズル取付け部と、高圧水流を前記吸水管
に送水する高圧ポンプ（不図示）と、その循環する水を
供給する送水側水槽（不図示）と、前記圧縮空気導入管
１５と、圧縮空気を供給する前記コンプレッサーとから
構成されている。The vibrating rod 7 in this embodiment is shown in FIG.
As shown in FIG. 3, a part of the water jet pump is arranged in the H-shaped steel 9, and the H-shaped steel 9 is provided to protect the water absorption pipe 8.
Of two water absorption pipe protectors 10a, 10b arranged along the flange 9a of the H-shaped steel 9 from above, and the water absorption pipe 8 arranged in the water absorption pipe protectors 10a, 10b
And a compressed air introducing pipe 15 for sending compressed air from a compressor (not shown) on the ground. In addition, the water jet pump in the present embodiment is the water suction pipe 8
A nozzle mounting part to be described later, a high pressure pump (not shown) for supplying a high pressure water flow to the water suction pipe, a water supply side water tank (not shown) for supplying the circulating water, the compressed air introduction pipe 15, It is composed of the compressor for supplying compressed air.
【００１７】前記吸水管８は、後述のノズル取付け部２
０で小径の鋼管８ａと大径の鋼管８ｂとが連結されて構
成されている。小径の鋼管８ａは、その一端が前記振動
ロッド７の上側となる前記Ｈ型鋼９の端部に固定され、
一方の吸水管プロテクター１０ａ中に該Ｈ型鋼９の他端
部に向かって配設され、前記振動ロッド７の下側となる
前記Ｈ型鋼９の端部付近で１８０度曲げられてノズル取
付け部２０に至っている。さらに小径の鋼管８ａは、ノ
ズル取付け部２０を介して大径の鋼管８ｂに連結され、
その大径の鋼管８ｂは他方の吸水管プロテクター１０ｂ
中を通されて振動ロッド７の上側に導かれている。The water suction pipe 8 is provided with a nozzle mounting portion 2 which will be described later.
At 0, a small diameter steel pipe 8a and a large diameter steel pipe 8b are connected. One end of the small-diameter steel pipe 8a is fixed to the end of the H-shaped steel 9 which is the upper side of the vibrating rod 7.
The nozzle mounting portion 20 is disposed in one of the water pipe protectors 10a toward the other end of the H-shaped steel 9 and is bent 180 degrees near the end of the H-shaped steel 9 below the vibrating rod 7. Has reached. Further, the small-diameter steel pipe 8a is connected to the large-diameter steel pipe 8b via the nozzle mounting portion 20,
The large diameter steel pipe 8b is the other water absorption pipe protector 10b.
It is passed through and guided to the upper side of the vibrating rod 7.
【００１８】前記ノズル取付け部２０は、前記２本の鋼
管８ａ，８ｂと溶接によって連結されており、図３に示
すように、高圧水流をノズル２１へ導く貫通孔２２と、
前記空気導入管１５に接続され、コンプレッサー（不図
示）による圧縮空気をノズル２１周辺に導入するための
圧縮空気導入部２３とが備えられている。The nozzle mounting portion 20 is connected to the two steel pipes 8a and 8b by welding, and as shown in FIG. 3, a through hole 22 for guiding a high pressure water flow to the nozzle 21,
A compressed air introduction part 23 is provided which is connected to the air introduction pipe 15 and introduces compressed air from a compressor (not shown) around the nozzle 21.
【００１９】前記ノズル２１は、ネジ軸に沿って中心部
に貫通孔２１ａを持つボルトからなっていてノズル取付
け部２０の前記貫通孔２２のジェット水流の噴出口側に
形成されたネジ穴２２ａに螺合して固定されている。ま
た、大径の鋼管８ｂの下端でノズル取付け部２０の近傍
には、吸水口である長方形の開口部１４が設けられてい
る。The nozzle 21 is composed of a bolt having a through hole 21a at the center along the screw axis, and is formed in a screw hole 22a formed at the jet water jet outlet side of the through hole 22 of the nozzle mounting portion 20. It is fixed by screwing. Further, a rectangular opening 14 which is a water intake port is provided at the lower end of the large-diameter steel pipe 8b near the nozzle mounting portion 20.
【００２０】なお、図２に示すように振動ロッド７の下
端部には、振動ロッド７を地中に貫入したり、引き抜い
たりするのを容易にすると共に地中での抵抗から前記吸
水管８を守るために、図２中矢印Ａ−Ａ線に沿った断面
がコの字状で外観がくさび形をした貫入案内部材１１，
１２が取り付けられている。この貫入案内部材１１，１
２は振動ロッド７の長手方向に沿って上下２つ備えられ
ている。第一の貫入案内部材１１は振動ロッド７のほぼ
下端部で吸水管８がほぼ１８０度湾曲している部分を覆
うように、くさび形状の鋭端部をそれぞれ上下に向けて
取り付けられている。下方に設けたくさび形状の傾斜面
１１ａは振動ロッド７を下方に貫入するのを助けてい
る。上方に設けたくさび形状の傾斜面１１ｂは、前記第
一の貫入案内部材１１の内側に土や砂が流入するのを防
いでいる。第一の貫入案内部材のくさび形状の傾斜面１
１ａ，１１ｂは地中で大きな抵抗力を受けるので、強度
を確保するために特殊加工処理されている。第二の貫入
案内部材１２は振動ロッド７の下端部からやや上方に取
り付けられている。この第二の貫入案内部材１２は、特
殊加工処理されたくさび形状の傾斜面１２ａを上に向け
て取り付けられていて、振動ロッド７を上方に引き抜く
時の抵抗を減じている。そして、振動ロッド７の下端に
取り付けられているフレスパネル１３，１３，…は、振
動ロッド７の貫入と引き抜きを容易にするもので、貫入
時には、図２に示すように外側に開き貫入抵抗を減少さ
せ、引き抜く時には内側に閉じ、さらに突き固め時には
周辺の土の流入に従って内側に閉じることで、締固め時
の先端面積を確保している。As shown in FIG. 2, the lower end portion of the vibrating rod 7 facilitates penetration of the vibrating rod 7 into and out of the ground, and resistance of the ground to the water absorbing pipe 8. In order to protect the penetration guide member 11, the cross section taken along the line AA in FIG.
12 is attached. This penetration guide member 11, 1
Two vibrating rods 2 are provided along the longitudinal direction of the vibrating rod 7. The first penetration guide member 11 is attached with its sharp wedge-shaped ends facing up and down so as to cover the portion where the water absorption pipe 8 is curved by approximately 180 degrees at the lower end of the vibrating rod 7. The wedge-shaped inclined surface 11a provided below helps to penetrate the vibrating rod 7 downward. The wedge-shaped inclined surface 11b provided above prevents soil and sand from flowing into the inside of the first penetration guide member 11. Wedge-shaped inclined surface 1 of the first penetration guide member
Since 1a and 11b receive a large resistance force in the ground, they are specially processed to ensure strength. The second penetration guide member 12 is attached slightly above the lower end of the vibrating rod 7. The second penetration guide member 12 is attached with the wedge-shaped inclined surface 12a that has been specially processed facing upward, and reduces the resistance when the vibrating rod 7 is pulled out upward. .. attached to the lower end of the vibrating rod 7 facilitate the penetration and withdrawal of the vibrating rod 7, and at the time of penetration, as shown in FIG. The tip area at the time of compaction is secured by reducing the volume and closing it inward when pulling it out, and further closing it inwardly as the soil flows in when compacting it.
【００２１】以上のように構成された振動締固め装置１
の動作を次に説明する。先ず、ベース車両２を地盤上に
設置し、リーダー４を地盤にほぼ垂直に固定し、起振機
６によって振動ロッド７を地中に圧入する。振動ロッド
７が所定位置に達した後、図１に示したように起振機６
によって振動ロッド７の所定量の引き抜きと貫入を繰り
返すことで地盤を締固める。The vibration compaction device 1 configured as described above.
The operation of will be described below. First, the base vehicle 2 is installed on the ground, the leader 4 is fixed substantially vertically to the ground, and the vibrating rod 7 is press-fitted into the ground by the exciter 6. After the vibrating rod 7 reaches a predetermined position, as shown in FIG.
The soil is compacted by repeatedly pulling out and penetrating the vibrating rod 7 by a predetermined amount.
【００２２】元々地盤に含まれる地下水や、振動により
振動ロッド７周辺に発生する過剰間隙水圧に由来する地
下水は、前記水噴流ポンプによって地中より吸水する。
前記高圧ポンプによって、前記送水側水槽から前記吸水
管８に高圧水流を送り込み、地中の水を吸い上げる。こ
の吸い上げられた水は前記送水側水槽に戻され、再度吸
水管８を循環する。Groundwater originally contained in the ground and groundwater derived from excessive pore water pressure generated around the vibrating rod 7 due to vibration are absorbed from the ground by the water jet pump.
By the high-pressure pump, a high-pressure water flow is sent from the water supply side water tank to the water absorption pipe 8 to suck up underground water. The sucked water is returned to the water supply side water tank and circulates through the water suction pipe 8 again.
【００２３】図１〜３に示すように、吸水管８の一端の
小径の鋼管８ａからノズル２１へ向かう方向に送り込ま
れた高圧水流は、ノズル２１によってジェット水流とな
り、ジェット水流が開口部１４を通過する際に負圧を生
じ、開口部１４から流入する地下水を巻き込んで大径の
鋼管８ｂ中へ流入する。このような水噴流ポンプによる
揚水によれば、１０ｍ以上の深層部の水を汲み上げるこ
とができる。そして、この揚水時には開口部１４から地
下水と共に地中の細粒分も流入するが、絶えず高圧の水
が吸水管８内を循環しているので、該細粒分は地上の送
水側水槽まで送られる。従って、吸水管８は閉塞せず、
通常振動締固め作業中に地中に位置することになる開口
部１４にフィルターを設置しなくても、目詰まりなしで
連続的に吸水を行える。さらに、前記ノズル２１近傍
に、圧縮空気導入部２３から送り込まれる圧縮空気を同
時に流入させ、その圧縮空気が大径の鋼管８ｂからなる
吸水管８中で水を押し上げることを利用して、前記水噴
流ポンプによる地下水の吸水効率を向上させることもで
きる。As shown in FIGS. 1 to 3, the high-pressure water flow sent from the small-diameter steel pipe 8a at one end of the water absorption pipe 8 toward the nozzle 21 becomes a jet water flow by the nozzle 21, and the jet water flow passes through the opening 14. When passing, a negative pressure is generated, and groundwater flowing in from the opening 14 is entrained and flows into the large-diameter steel pipe 8b. By pumping water with such a water jet pump, it is possible to pump up water in a deep layer of 10 m or more. Then, at the time of this pumping, fine particles in the ground also flow in from the opening 14 together with the groundwater, but since high-pressure water constantly circulates in the water absorption pipe 8, the fine particles are sent to the water tank on the water supply side on the ground. To be Therefore, the water suction pipe 8 is not blocked,
Even if a filter is not installed in the opening 14 that is normally located in the ground during the vibration compaction work, water can be continuously absorbed without clogging. Further, the compressed air sent from the compressed air introduction part 23 is made to flow into the vicinity of the nozzle 21 at the same time, and the compressed air pushes up the water in the water absorption pipe 8 made of the steel pipe 8b having a large diameter. It is also possible to improve the water absorption efficiency of groundwater by the jet pump.
【００２４】なお、地盤改良を行う地盤の表層が硬く起
振機６のみによる振動ロッド７の圧入が困難である場合
など地盤条件によっては、振動ロッド７の圧入時に先端
水ジェットを併用する必要があるが、前記水噴流ポンプ
に用いる高圧水は、振動ロッド７の貫入時には先端水ジ
ェットとして使用し、その後、吸水に転用することがで
きる。また、集水した地下水も先端水ジェットとして利
用できる。Depending on the ground conditions, such as when the ground surface to be improved is hard and it is difficult to press-fit the vibrating rod 7 by only the exciter 6, it is necessary to use the tip water jet together when press-fitting the vibrating rod 7. However, the high-pressure water used for the water jet pump can be used as a tip water jet when the vibrating rod 7 penetrates, and then can be diverted to absorb water. Also, the collected groundwater can be used as a tip water jet.
【００２５】このように、車両ベース２に取り付けられ
たリーダー４を地盤にほぼ垂直に固定し、起振機６によ
って振動ロッド７を地中の所定位置に圧入した後、起振
機６によって振動ロッド７の所定量の引き抜きと貫入を
繰り返すことで地盤の締固めを行うが、この時に発生す
る過剰間隙水圧に基づく地下水を水噴流ポンプによって
吸水することによって深度の深い地中でも効果的に地盤
を締固めることができる。さらに、水噴流ポンプの吸水
管８の開口部１４から細粒分が流入しても高圧ジェット
水と共にこれが送水側水槽に運ばれるため、振動締固め
作業中は地中に位置する開口部１４にフィルターを設置
する必要がなく、開口部１４の閉塞は生じない。そのた
め、通常地中に位置するフィルターの清掃を行わずに済
み、振動締固め作業を中断することがない。As described above, the leader 4 attached to the vehicle base 2 is fixed substantially vertically to the ground, and the vibrating rod 7 is pressed into a predetermined position in the ground by the vibration generator 6 and then vibrated by the vibration generator 6. The ground is compacted by repeatedly pulling out and penetrating a predetermined amount of the rod 7, but the groundwater based on the excessive pore water pressure generated at this time is absorbed by the water jet pump to effectively ground the ground even in deep ground. Can be compacted. Furthermore, even if fine particles flow from the opening 14 of the water suction pipe 8 of the water jet pump, they are carried together with the high pressure jet water to the water tank on the water sending side, so that during the vibration compaction work, the fine particles are introduced into the opening 14 located in the ground. There is no need to install a filter and the opening 14 is not blocked. Therefore, it is not necessary to normally clean the filter located in the ground, and the vibration compaction work is not interrupted.
【００２６】なお、以上の実施の形態例においては、振
動ロッドはＨ型鋼であるとしたが、例えば鋼管など、他
のものでもよい。また、吸水管８は鋼管８ａ，８ｂで形
成されているとしたが、本発明はこれに限定されるもの
ではなく、十分な強度があれば材質はなんでもよく、ま
た、その直径や長さ、及び本数等も特に限定されるもの
ではない。そして、吸水口の開口部１４の形状が長方形
であるとしたが、例えば、スリット状や編目状等でもよ
く、また、吸水専用の管を別に設けたりしても良いな
ど、例として挙げたものに限らない。さらに、圧縮空気
導入部２３の形状も特に限定されるものではない。ま
た、ノズル２１の直径や形状等も任意であり、その他、
具体的な細部構造等についても適宜に変更可能であるこ
とは勿論である。Although the vibrating rod is made of H-shaped steel in the above-mentioned embodiments, it may be made of other material such as a steel pipe. Further, although the water absorption pipe 8 is formed of the steel pipes 8a and 8b, the present invention is not limited to this, and any material may be used as long as it has sufficient strength, and its diameter and length, Also, the number and the like are not particularly limited. The shape of the opening 14 of the water inlet is rectangular, but it may be, for example, a slit shape or a stitch shape, or a pipe dedicated to water absorption may be separately provided. Not limited to Furthermore, the shape of the compressed air introduction part 23 is not particularly limited. Further, the diameter and shape of the nozzle 21 are arbitrary, and
It goes without saying that the specific detailed structure and the like can be changed as appropriate.
【００２７】＜実験例＞水噴流ポンプによる吸水、揚水
効果、及び圧縮空気導入の効果を明らかにするために、
導入する圧縮空気の圧力を変えて、ジェット水流による
揚水試験を行った。まず、水中において、導入する圧縮
空気の圧力（エア圧）と、その時の吸水量との関係を調
べた実験１について説明する。図４（ａ）に示すように
水を満たした吸水側水槽３１の上方２０メートルからホ
ース４１を吊下げる。その水中に導入する一方の端部に
は、本実験のノズル取付け部である水噴流ポンプ部５０
の一端が取り付けられ、この水噴流ポンプ部５０の他端
にはジェット水用高圧ポンプ３３の出水口からの高圧ホ
ース４３が接続されている。また、コンプレッサー３４
の排気口からのエアーホース４４は、風量計３５及び圧
力計（不図示）に接続され、さらに、前記風量計３５及
び前記圧力計に送り込まれた圧縮空気はエアーホース４
５によって前記水噴流ポンプ部５０に導入されるように
なっている。<Experimental example> In order to clarify the effect of water absorption, pumping effect, and compressed air introduction by a water jet pump,
A pumping test by a jet water flow was performed by changing the pressure of the compressed air introduced. First, Experiment 1 in which the relationship between the pressure of compressed air to be introduced (air pressure) in water and the amount of water absorption at that time was examined will be described. As shown in FIG. 4A, the hose 41 is suspended from 20 meters above the water tank 31 on the water absorption side filled with water. At one end to be introduced into the water, a water jet pump unit 50 which is a nozzle mounting unit of the present experiment is provided.
Is attached to the other end of the water jet pump unit 50, and a high pressure hose 43 from the water outlet of the jet water high pressure pump 33 is connected to the other end. Also, the compressor 34
The air hose 44 from the exhaust port is connected to the air flow meter 35 and the pressure gauge (not shown), and the compressed air sent to the air flow meter 35 and the pressure gauge is the air hose 4.
5 is introduced into the water jet pump unit 50.
【００２８】詳細に図示はしないが、前記水噴流ポンプ
部５０は、前記高圧ホース４３から送水される高圧水流
をジェット水流とするためのノズルと、前記エアーホー
ス４５から送り込まれる圧縮空気をノズル周辺に送り込
む圧縮空気導入口と、前記ノズル及び前記圧縮空気導入
口と前記ホース４１との中間に設けられた吸水口から概
略構成されるものである。Although not shown in detail, the water jet pump unit 50 has a nozzle for turning the high-pressure water stream sent from the high-pressure hose 43 into a jet water stream, and the compressed air sent from the air hose 45 around the nozzle. And a water inlet provided in the middle of the nozzle and the compressed air inlet and the hose 41.
【００２９】そして、前記吸水側水槽３１の上から吊下
げられたホース４１のもう一方の端部は、吸水側流量計
３６の入水口に接続され、該吸水側流量計３６の出水口
はホース４６によって送水側水槽３０に導かれている。
また、該送水側水槽３０の水中から送水側流量計３２の
入水口に向けてホース４０が配設され、前記送水側流量
計３２の出水口は、ホース４２によってジェット水用高
圧ポンプ３３の入水口と接続されている。The other end of the hose 41 suspended from the water absorption side water tank 31 is connected to the water inlet of the water absorption side flow meter 36, and the water outlet of the water absorption side flow meter 36 is a hose. It is guided to the water supply side water tank 30 by 46.
Further, a hose 40 is arranged from the water in the water supply side water tank 30 toward the water inlet of the water supply side flow meter 32, and the outlet of the water supply side flow meter 32 is connected to the jet water high-pressure pump 33 by a hose 42. It is connected to the water spout.
【００３０】このように構成した実験装置において、ジ
ェット水用高圧ポンプ３３とコンプレッサー３４を稼働
させると、送水側水槽３０から供給される水がジェット
水用高圧ポンプ３３によって、高圧ホース４３を通って
水噴流ポンプ部５０に送り込まれる。前記水噴流ポンプ
部５０に送り込まれた水は水噴流ポンプ部５０中のノズ
ルによってジェット水流となり、該ジェット水流は吸水
口から流入する水を巻き込んでホース４１中を上昇して
いく。また、前記水噴流ポンプ部５０の圧縮空気導入口
には、前記コンプレッサー３４からの圧縮空気が送り込
まれる。この空気はジェット水流とともにホース４１中
を上昇し、吸水側水槽３１の水を吸水する。In the experimental apparatus thus constructed, when the jet water high-pressure pump 33 and the compressor 34 are operated, the water supplied from the water tank 30 on the water supply side passes through the high-pressure hose 43 by the jet water high-pressure pump 33. It is sent to the water jet pump unit 50. The water sent to the water jet pump unit 50 becomes a jet water flow by the nozzle in the water jet pump unit 50, and the jet water flow entrains the water flowing from the water suction port and rises in the hose 41. Further, the compressed air from the compressor 34 is sent to the compressed air introduction port of the water jet pump unit 50. This air rises in the hose 41 together with the jet water flow, and absorbs the water in the water absorption side water tank 31.
【００３１】吸水量（例えばＣｌ／分）は、送水側水槽
３０からジェット水用高圧ポンプ３３に供給される供給
水量（例えばＡｌ／分）を送水側流量計３２より求め、
その供給水量と吸水側水槽３１からの吸水量の合計水量
（例えばＢｌ／分）を吸水側流量計３６で求め、該合計
水量（Ｂｌ／分）と前記供給水量（Ａｌ／分）の差
（（Ｂ−Ａ＝Ｃ）ｌ／分）を求めることで知ることがで
きる。あるいは、吸水量を吸水側水槽３１の水位低下量
から求めても良い。また、前記風量計３５及び前記圧力
計で、コンプレッサー３４から供給される圧縮空気量及
び圧縮空気圧力を知ることができる。The amount of water absorption (for example, Cl / min) is obtained from the water flow meter 32 for the amount of water supplied (for example, Al / min) supplied from the water tank 30 on the water supply side to the high-pressure pump 33 for jet water.
A total water amount (for example, Bl / min) of the supplied water amount and the water absorption amount from the water absorption side water tank 31 is obtained by the water absorption side flow meter 36, and the difference between the total water amount (Bl / min) and the supply water amount (Al / min) ( It can be known by obtaining (B−A = C) 1 / min). Alternatively, the water absorption amount may be obtained from the water level reduction amount of the water absorption side water tank 31. Further, the amount of compressed air and the compressed air pressure supplied from the compressor 34 can be known by the air flow meter 35 and the pressure gauge.
【００３２】図５（ａ）はジェット水流の供給水量を２
２０ｌ／分とした時の、コンプレッサー３４から供給さ
れる圧縮空気の圧力と吸水量との関係を示したものであ
る。この図から明かなように、圧縮空気導入口の直径が
一定（３．５ｍｍ）である場合、適当な圧力の圧縮空気
を送り込むことで、圧縮空気を送り込まなかった場合に
比べて吸水量が増加する。今回の実験では、特に圧縮空
気の圧力を０．７ｋｇｆ／ｃｍ2 程度にした時に、吸水
量が１２８ｌ／分と最大になった。FIG. 5 (a) shows that the amount of jet water supplied is 2
It shows the relationship between the pressure of compressed air supplied from the compressor 34 and the amount of water absorption when the flow rate is 20 l / min. As is clear from this figure, when the diameter of the compressed air inlet is constant (3.5 mm), the amount of water absorption increases by sending compressed air at an appropriate pressure compared to the case where compressed air is not sent. To do. In this experiment, especially when the pressure of the compressed air was set to about 0.7 kgf / cm 2 , the water absorption amount reached a maximum of 128 l / min.
【００３３】次に、砂中においての導入する圧縮空気の
圧力（エア圧）と、その時の吸水量との関係を調べた実
験２について説明する。実験２で用いた実験装置は、図
４（ｂ）に示すように、実験１とほぼ同様の構成である
が、実験１での吸水側水槽３１の代わりに、水を含んだ
砂からなるモデル砂地盤６０を用いている点が異なる。Next, Experiment 2 in which the relationship between the pressure of compressed air introduced in sand (air pressure) and the amount of water absorption at that time was investigated will be described. As shown in FIG. 4 (b), the experimental apparatus used in the experiment 2 has almost the same configuration as the experiment 1, but instead of the water absorption side water tank 31 in the experiment 1, a model made of sand containing water. The difference is that the sand ground 60 is used.
【００３４】実験１と同様にジェット水流の供給水量を
一定として、モデル砂地盤６０からの吸水量を調べる実
験を行ったところ図５（ｂ）に示す結果を得た。この図
から、モデル砂地盤６０からの吸水でも、前記水中から
の吸水と同様に、一定の供給水量のジェット水流のもと
で適度な圧力の圧縮空気を送り込んだ場合では、圧縮空
気を送り込まなかった場合に比べて吸水量が増加するこ
とが解る。今回の実験では、特に圧縮空気の圧力を０．
７ｋｇｆ／ｃｍ2 程度にした時に、吸水量が１２７ｌ／
分と最大になった。As in the case of Experiment 1, an experiment for examining the amount of water absorbed from the model sand ground 60 was carried out with the amount of jet water supplied being constant, and the results shown in FIG. 5 (b) were obtained. From this figure, even in the case of absorbing water from the model sand ground 60, as in the case of absorbing water from the water, in the case where compressed air of a proper pressure is fed under a jet water flow of a constant supply amount, compressed air is not fed. It can be seen that the amount of water absorption increases as compared to the case of In this experiment, the pressure of the compressed air was set to 0.
When it is set to about 7 kgf / cm 2 , the water absorption is 127 l /
Minutes and maximums.
【００３５】これらの結果から、ノズル付近に適圧の圧
縮空気を送り込むことによって、圧縮空気を送り込まな
い場合に比べて、水噴流ポンプの吸水能力を高めること
ができることがわかる。From these results, it is understood that by sending compressed air of a suitable pressure to the vicinity of the nozzle, the water absorption capacity of the water jet pump can be enhanced as compared with the case where compressed air is not sent.
【００３６】[0036]
【発明の効果】以上のように、請求項１記載の発明に係
る振動締固め装置によれば、起振機を稼働させて振動ロ
ッドに振動を加えて地盤を締固める時に発生する過剰間
隙水圧を、水噴流ポンプによって、前記振動ロッドの近
傍に備えられた吸水管の開口部から地下水を吸水するこ
とで解消するものとしたので、１０ｍ以上の深層部の振
動締固めにあっても、振動ロッド先端部の周辺の水を地
上へと揚水することができる。従って、効果的に地盤の
締固めを行うことができる。さらに、吸水と同時に混入
するシルト、砂などの細粒分は、循環する高圧水流とと
もに地上へ送られるので、目詰まりは生じず、振動締固
め作業中、地中に位置することになる開口部にフィルタ
ーを用いない。従って、振動締固め作業を中断してフィ
ルター清掃をする必要がなく、効率的に振動締固め作業
を行える。As described above, according to the vibration compacting device of the first aspect of the present invention, the excessive pore water pressure generated when the vibrating rod is activated to vibrate the vibrating rod to compact the ground. Is solved by absorbing groundwater from the opening of the water absorption pipe provided in the vicinity of the vibrating rod by the water jet pump. Therefore, even if vibration is compacted in a deep layer of 10 m or more, Water around the rod tip can be pumped to the ground. Therefore, the ground can be effectively compacted. Furthermore, fine particles such as silt and sand mixed with water absorption are sent to the ground along with the circulating high-pressure water flow, so that clogging does not occur and the opening that will be located in the ground during vibration compaction work. Do not use a filter. Therefore, it is not necessary to interrupt the vibration compaction work to clean the filter, and the vibration compaction work can be efficiently performed.
【００３７】[0037]
【００３８】請求項３記載の振動ロッドによれば、振動
ロッド周辺の水を排除するための水噴流ポンプの一部で
あって高圧水流をノズルに向けて送り込む第１の吸水管
と、ジェット水流と振動ロッド周辺の水とを地上に送り
出す第２の吸水管とが振動ロッドと一体となっているの
で、振動締固め装置による振動締固め作業において、水
噴流ポンプで振動ロッド周辺の水を吸水することによっ
て振動により発生する過剰間隙水圧を解消できる。さら
に振動ロッドに第１及び第２の吸水管とが一体的に備え
られているので、振動ロッド近傍の水を確実に吸水でき
る。従って、効果的に地盤の振動締固めを行うことがで
きる。According to the vibrating rod of the third aspect, the first water suction pipe which is a part of the water jet pump for removing the water around the vibrating rod and sends the high-pressure water flow toward the nozzle, and the jet water flow. And the second water absorption pipe that sends water around the vibrating rod to the ground are integrated with the vibrating rod, so that in the vibration compaction work by the vibration compacting device, the water jet pump absorbs the water around the vibrating rod. By doing so, excess pore water pressure generated by vibration can be eliminated. Further, since the vibrating rod is integrally provided with the first and second water absorbing pipes, water near the vibrating rod can be reliably absorbed. Therefore, it is possible to effectively perform vibration compaction of the ground.
【００３９】[0039]
【図１】本発明を適用した一例としての振動締固め装置
を示した概略説明図である。FIG. 1 is a schematic explanatory view showing a vibration compaction device as an example to which the present invention is applied.
【図２】本発明を適用した一例としての振動締固め装置
の振動ロッドの先端部を示す図であって、（ａ）は正面
図、（ｂ）は側面図、（ｃ）は（ａ）中矢印Ａ−Ａ線で
の断面図である。2A and 2B are diagrams showing a tip portion of a vibrating rod of a vibration compacting device as an example to which the present invention is applied, in which FIG. 2A is a front view, FIG. 2B is a side view, and FIG. It is sectional drawing in the arrow AA line.
【図３】図２（ａ）のＢ部分のノズル取付け部の拡大側
断面図である。FIG. 3 is an enlarged side cross-sectional view of a nozzle mounting portion of portion B of FIG. 2 (a).
【図４】（ａ）は本発明に係る吸水側水槽からの吸水実
験の条件を示す説明図、（ｂ）は本発明に係るモデル砂
地盤からの吸水実験の条件を示す説明図である。FIG. 4A is an explanatory diagram showing conditions of a water absorption experiment from a water absorption side water tank according to the present invention, and FIG. 4B is an explanatory diagram showing conditions of a water absorption experiment from a model sand ground according to the present invention.
【図５】（ａ）は本発明に係る吸水側水槽からの吸水実
験の結果を示す説明図、（ｂ）は本発明に係るモデル砂
地盤からの吸水実験の結果を示す説明図である。FIG. 5 (a) is an explanatory view showing a result of a water absorption experiment from a water absorption side water tank according to the present invention, and (b) is an explanatory view showing a result of a water absorption experiment from a model sand ground according to the present invention.
１ 振動締固め装置 ２ ベース車両 ４ リーダー ６ 起振機 ７ 振動ロッド ８ 吸水管 ９ Ｈ型鋼 １４ 開口部 ２０ ノズル取付け部 ２１ ノズル ２３ 圧縮空気導入部 ３１ 吸水側水槽 ３３ ジェット水用高圧ポンプ ３４ コンプレッサー ５０ 水噴流ポンプ部 ６０ モデル砂地盤 1 Vibration compactor 2 base vehicles 4 leader 6 exciter 7 Vibration rod 8 Water absorption pipe 9 H type steel 14 openings 20 Nozzle mount 21 nozzles 23 Compressed air inlet 31 Water absorption side water tank 33 High-pressure pump for jet water 34 Compressor 50 Water jet pump section 60 model sand ground
───────────────────────────────────────────────────── フロントページの続き (72)発明者 西尾 経 東京都台東区柳橋２丁目17番４号 小野 田ケミコ株式会社内 (56)参考文献 特開 平７−300847（ＪＰ，Ａ) 特開 平９−31961（ＪＰ，Ａ) 実開 平２−7399（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Tsuyoshi Nishio 2-17-4 Yanagibashi, Taito-ku, Tokyo Ono Within Tabemiko Co., Ltd. (56) Reference JP-A-7-300847 (JP, A) JP-A-9-31961 (JP, A) Actual Kaihei 2-7399 (JP, U)
Claims (2)
る振動ロッドと、該振動ロッド近傍に配設された吸水管
及び該吸水管に対して高圧水流を送り込む高圧ポンプか
らなる水噴流ポンプとを含む振動締固め装置であって、前記 高圧ポンプからの高圧水流をジェット水流にするノ
ズルに向けて送り込む第１の吸水管と、前記ノズルから
のジェット水流の通過によって前記振動ロッド周辺の地
下水及び砂礫が流入することとなる開口部を有し、ジェ
ット水流と該開口部に流入する地下水及び砂礫を地上に
送り出す第２の吸水管とを、前記振動ロッドをなすＨ形
鋼のフランジに沿って配設したことを特徴とする振動締
固め装置。1. An H-section steel attached to the lower part of a vibration exciter .
That a vibration rod, a vibrating compaction apparatus comprising a water jet pump comprising a high-pressure pump for feeding the high-pressure water jet against the vibrating rod suction pipe disposed near and water absorbing tube, from the high pressure pump the high-pressure water jet has a first water pipe for feeding toward the nozzle to jet water flow, an opening so that the ground water and gravel around the vibrating rod flows by the passage of jet stream from the nozzle, GETS
Water flow and groundwater and gravel flowing into the opening to the ground
The second water-absorbing pipe to be sent out is H-shaped which forms the vibrating rod.
A vibration compaction device characterized by being arranged along a steel flange .
のＨ形鋼による振動ロッドであって、 高圧ポンプからの高圧水流をジェット水流にするノズル
に向けて送り込む第１の吸水管と、前記ノズルからのジ
ェット水流の通過によって振動ロッド周辺の地下水及び
砂礫が流入することとなる開口部を有し、ジェット水流
と該開口部に流入する地下水及び砂礫を地上に送り出す
第２の吸水管とを、前記Ｈ形鋼のフランジに沿って一体
的に設けてなることを特徴とする振動ロッド。2. A vibration rod made of H-shaped steel in a vibration compaction device for compacting the ground by vibration, wherein a high-pressure water stream from a high-pressure pump is used as a jet stream.
Having a first water tube feeding, the openings groundwater and gravel around the vibrating rod so that the flows by the passage of jet stream from the nozzle toward the, water jet
And send groundwater and gravel flowing into the opening to the ground
A vibrating rod , wherein a second water absorbing pipe is integrally provided along the flange of the H-shaped steel .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14213997A JP3486075B2 (en) | 1997-05-30 | 1997-05-30 | Vibration compaction device and vibration rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14213997A JP3486075B2 (en) | 1997-05-30 | 1997-05-30 | Vibration compaction device and vibration rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10331147A JPH10331147A (en) | 1998-12-15 |
| JP3486075B2 true JP3486075B2 (en) | 2004-01-13 |
Family
ID=15308280
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14213997A Expired - Lifetime JP3486075B2 (en) | 1997-05-30 | 1997-05-30 | Vibration compaction device and vibration rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3486075B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101886384A (en) * | 2010-07-07 | 2010-11-17 | 广州市盛洲地基基础工程有限公司 | Vacuum and dynamic compaction synchronization method |
| CN105738943B (en) * | 2016-03-22 | 2017-12-15 | 韩建江 | A kind of hydraulic drives vibrator for underwater geological exploration |
| CN112695733B (en) * | 2020-12-22 | 2022-11-25 | 广东鼎瑞建设工程有限公司 | Foundation tamping equipment for construction of building site |
-
1997
- 1997-05-30 JP JP14213997A patent/JP3486075B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10331147A (en) | 1998-12-15 |
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