JPH06158638A - Method and device for constructing improved ground - Google Patents
Method and device for constructing improved groundInfo
- Publication number
- JPH06158638A JPH06158638A JP35406292A JP35406292A JPH06158638A JP H06158638 A JPH06158638 A JP H06158638A JP 35406292 A JP35406292 A JP 35406292A JP 35406292 A JP35406292 A JP 35406292A JP H06158638 A JPH06158638 A JP H06158638A
- Authority
- JP
- Japan
- Prior art keywords
- hardening agent
- ground
- cavity
- improvement body
- coagulant
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/26—Compacting soil locally before forming foundations; Construction of foundation structures by forcing binding substances into gravel fillings
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は硬化剤を地中の空洞に噴
射注入することによって、地中にコラム状の硬化した改
良体を造成して地盤を強化する地盤改良体造成工法及び
装置に関し、作業能率を低下させることなく、造成され
る改良体の大きさを正確に管理、把握できるようにした
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a device for constructing a ground improvement body for injecting a hardening agent into a cavity in the ground to form a column-shaped hardened improvement body in the ground to strengthen the ground. The size of the improved body to be created can be accurately controlled and grasped without reducing the work efficiency.
【０００２】[0002]
【従来の技術】軟弱地盤の改良、建築物基礎の造成、地
山の支保等を目的として、高圧ウォータージェット等に
よって地中に空洞を形成し、その後その地中の空洞内に
セメントミルク等の硬化剤を注入して空洞内の泥水を硬
化剤で置換することによって、地中にコラム状の地盤改
良体を造成する工法が種々開発されている。2. Description of the Related Art For the purpose of improving soft ground, building foundations, supporting ground, etc., a cavity is formed in the ground by a high-pressure water jet, etc., and then cement milk, etc. Various construction methods have been developed for injecting a hardening agent to replace muddy water in a cavity with the hardening agent to form a column-shaped ground improvement body in the ground.
【０００３】この種の工法では、地中に形成される地盤
改良体の径を設計された大きさに正確に造成することが
重要である。そこで、掘削された地中の空洞の大きさを
超音波を利用して立体的に計測するシステムが開発され
ている。このシステムを用いれば、地中の空洞が所要の
大きさに形成されたことが確認でき、しかも必要最低限
の硬化剤を使用して経済的に設計通りの地盤改良体を造
成することができる。In this type of construction method, it is important that the diameter of the ground improvement body formed in the ground is accurately formed to the designed size. Therefore, a system for three-dimensionally measuring the size of the excavated underground cavity using ultrasonic waves has been developed. By using this system, it is possible to confirm that the cavity in the ground has been formed to the required size, and it is possible to economically construct the ground improvement body as designed using the minimum necessary curing agent. .
【０００４】[0004]
【発明が解決しようとする課題】地盤改良体造成装置の
中には、掘削に伴う排泥と硬化剤注入を同時に行うこと
のできるものが開発されており、この装置によれば、能
率良く地盤改良体造成工事を施工することができる。Among the ground improvement body constructing devices, a device capable of simultaneously performing the mud removal and the hardening agent injection accompanying the excavation has been developed. According to this device, the ground is improved efficiently. Improved body construction work can be performed.
【０００５】ところが、上述の超音波を用いた空洞計測
システムは、超音波で空洞を計測するときは形成された
空洞内を実質的に泥水で満たした状態とする必要があ
る。そのため、このシステムを用いて地盤改良体を造成
するには、地中に所要の空洞を掘削した後、掘削によっ
て出た土砂を排出して空洞を泥水で満たし、その状態で
超音波で空洞の径を計測し、その後、硬化剤を注入して
空洞内の泥水を硬化剤で置換するという工程を採らなけ
ればならない。すなわち、掘削工程と硬化剤注入工程の
間に排泥を排出して空洞径計測を行う工程が必要であ
り、掘削と硬化剤注入を同時進行で能率的に施工する工
法は用いることができなかった。However, in the above-mentioned cavity measuring system using ultrasonic waves, when the cavity is measured by ultrasonic waves, it is necessary to substantially fill the inside of the formed cavity with muddy water. Therefore, in order to create a soil improvement body using this system, after excavating the required cavity in the ground, discharge the earth and sand discharged by excavation and fill the cavity with muddy water, and in that state ultrasonically The steps must be taken to measure the diameter and then inject the curing agent to replace the mud in the cavity with the curing agent. In other words, it is necessary to discharge the sludge between the excavation process and the hardening agent injection process to measure the cavity diameter, and it is not possible to use a construction method that efficiently carries out the drilling and hardening agent injection at the same time. It was
【０００６】本発明は、上述に鑑みて成されたものであ
り、作業能率を低下させることなく、造成される改良体
の大きさを超音波を用いた空洞計測システムを用いて正
確に管理、把握できる地盤改良体造成工法及び装置を提
供することを目的としている。The present invention has been made in view of the above, and accurately manages the size of an improved body to be formed by using a cavity measuring system using ultrasonic waves without lowering work efficiency. It is an object of the present invention to provide a ground improvement body construction method and device that can be grasped.
【０００７】[0007]
【課題を解決するための手段】上述の目的を達成するた
めの本発明にかかる地盤改良体造成工法は、地中を削孔
した後、硬化剤注入ロッドから硬化剤を高圧で噴射しつ
つ該硬化剤注入ロッドを引き上げることによって地盤改
良体を対象地盤に造成する地盤改良体造成工法におい
て、削孔後、混濁状態にある排泥中に沈降凝集剤を噴
射、攪伴して排泥中の水と泥とを分離させた後、削孔さ
れた空洞を超音波で計測し、続いて硬化剤を噴射注入す
ることを特徴とする。A method for constructing a ground improvement body according to the present invention for achieving the above-mentioned object is to provide a hardening agent injected from a hardening agent injection rod at a high pressure after drilling a hole in the ground. In the ground improvement body construction method in which the ground improvement body is created on the target ground by pulling up the hardening agent injection rod, after the drilling, the sedimentation coagulant is injected into the mud in the turbid state The method is characterized in that after the water and the mud are separated, the cavities that have been drilled are ultrasonically measured, and then a curing agent is injected and injected.
【０００８】また、本発明にかかる地盤改良体造成工法
は、削孔された空洞内に硬化剤を噴射した後、沈降凝集
剤を噴射して排泥中の泥と硬化剤とを水から分離沈澱さ
せた後、削孔された空洞を超音波で計測する。好適に
は、硬化剤注入ロッドを漸次引き上げながら、前記空洞
内の複数の地点で前記硬化剤噴射、前記沈降凝集剤噴
射、前記超音波計測を行う。Further, in the ground improvement body construction method according to the present invention, after injecting the hardening agent into the hollowed hole, the sedimentation coagulant is injected to separate the mud in the sludge and the hardening agent from water. After precipitation, the cavities that have been drilled are ultrasonically measured. Preferably, while gradually raising the curing agent injection rod, the curing agent injection, the sedimentation coagulant injection, and the ultrasonic measurement are performed at a plurality of points in the cavity.
【０００９】また、上述の目的を達成するための本発明
にかかる地盤改良体造成装置は、地中を削孔した後、硬
化剤注入ロッドから硬化剤を高圧で噴射しつつ該硬化剤
注入ロッドを引き上げることによって地盤改良体を対象
地盤に造成する地盤改良体造成装置において、前記硬化
剤注入ロッドに、硬化剤噴射ノズルに隣接して、沈降凝
集剤を噴射するノズルと、空洞を計測する超音波センサ
とが具えられたことを特徴とする。Further, in the ground improvement body forming apparatus according to the present invention for achieving the above-mentioned object, after the hole is drilled in the ground, the hardening agent is injected from the hardening agent injection rod at a high pressure while the hardening agent injection rod is injected. In the ground improvement body forming device for forming a ground improvement body on the target ground by pulling up, the hardening agent injection rod is adjacent to the hardening agent injection nozzle, a nozzle for injecting a sedimentation coagulant, and a super cavity for measuring a cavity. And a sound wave sensor.
【００１０】また、本発明にかかる地盤改良体造成装置
は、硬化剤噴射ノズルに隣接して硬化剤注入ロッドに空
洞計測システムの超音波センサが具えられると共に、硬
化剤に代えて前記硬化剤噴射ノズルから沈降凝集剤を噴
射させる装置が設けられたことを特徴とする。Further, in the ground improvement body forming apparatus according to the present invention, the hardening agent injection rod is provided with the ultrasonic sensor of the cavity measuring system adjacent to the hardening agent injection nozzle, and the hardening agent is injected instead of the hardening agent. It is characterized in that a device for injecting the sedimentation coagulant from the nozzle is provided.
【００１１】[0011]
【作用】削孔によって生成されて混濁状態にある排泥中
に沈降凝集剤を噴射、攪伴すると、該沈降凝集剤の作用
によって排泥が水と泥とに迅速に分離する。従って、直
ぐに超音波による空洞計測が可能となり、該計測に基い
て続いて硬化剤の噴射注入が行われる。When the sedimentation coagulant is injected and stirred into the turbid mud produced by drilling, the sludge is rapidly separated into water and mud by the action of the sedimentation coagulant. Therefore, it becomes possible to immediately measure the cavity by ultrasonic waves, and the injection of the curing agent is subsequently performed based on the measurement.
【００１２】また、硬化剤の噴射後、沈降凝集剤を噴射
すると、該沈降凝集剤の作用によって泥と硬化剤とが水
から分離沈澱する。分離後は直ちに超音波による空洞計
測が可能となる。硬化剤注入ロッドを漸次引き上げなが
ら、空洞内の複数の地点で硬化剤噴射、沈降凝集剤噴
射、超音波計測を行うことで造成される地盤改良体が立
体的に計測される。When the sedimentation flocculant is ejected after the ejection of the curing agent, the action of the sedimentation flocculant causes the mud and the curing agent to separate and precipitate from water. Immediately after separation, ultrasonic measurement of the cavity becomes possible. While gradually raising the hardening agent injection rod, hardening agent injection, sedimentation coagulant injection, and ultrasonic measurement are performed at a plurality of points in the cavity to three-dimensionally measure the ground improvement body.
【００１３】[0013]
【実施例】以下、本発明の一実施例を図面によって具体
的に説明する。図１は本発明の一実施例にかかる地盤改
良体造成装置の要部の構成図である。図１に示すよう
に、硬化剤注入ロッド１１は、その最先端部に掘削ビッ
ト１２を有すると共に、その周面に硬化剤噴射ノズル１
３、高圧水噴射ノズル１４、沈降凝集剤噴射ノズル１
５、超音波センサ１６を有している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a configuration diagram of a main part of a ground improvement body constructing apparatus according to an embodiment of the present invention. As shown in FIG. 1, the hardener injection rod 11 has a drill bit 12 at its most distal end, and the hardener injection nozzle 1 is provided on the peripheral surface thereof.
3, high pressure water injection nozzle 14, sedimentation coagulant injection nozzle 1
5, has an ultrasonic sensor 16.
【００１４】硬化剤注入ノズル１３は図示しない高圧硬
化剤供給装置に接続されると共に、高圧水噴射ノズル１
４は図示しない高圧水供給装置に接続されている。ま
た、沈降凝集剤噴射ノズル１５は、図示しない沈降凝集
剤供給装置に接続されており、適宜開閉弁を開閉するこ
とによって沈降凝集剤ノズル１５から沈降凝集剤が高圧
で噴射される。ここで、沈降凝集剤とは、混濁状態にあ
る排泥に混入することにより、泥、硬化剤等を水から速
やかに分離して、沈澱させるものであり、例えば、ポリ
塩化アルミニウム、液体硫酸アルミニウム等の無機系凝
集剤、あるいは高分子系凝集剤等が利用できる。The hardener injection nozzle 13 is connected to a high-pressure hardener supply device (not shown), and the high-pressure water jet nozzle 1
Reference numeral 4 is connected to a high-pressure water supply device (not shown). The settling coagulant injection nozzle 15 is connected to a settling coagulant supply device (not shown), and the settling coagulant nozzle 15 injects the settling coagulant at high pressure by opening and closing the on-off valve as appropriate. Here, the sedimentation flocculant is a substance that is mixed with the sewage sludge in the turbid state to rapidly separate the mud, the curing agent, etc. from the water to cause precipitation, and examples thereof include polyaluminum chloride and liquid aluminum sulfate. Inorganic flocculants such as, or polymer flocculants can be used.
【００１５】超音波センサ１６は公知の超音波を利用し
た地中の空洞計測システムの一部をなすものであり、地
上に設けられた制御装置の下に超音波を発信すると共に
反射波を受信して空洞壁面までの距離を測定する。The ultrasonic sensor 16 is a part of a well-known underground cavity measuring system using ultrasonic waves. The ultrasonic sensor 16 transmits ultrasonic waves and receives reflected waves under a control device provided on the ground. And measure the distance to the cavity wall.
【００１６】一方、硬化剤注入ロッド１１の上部は図示
しない駆動装置によって支持され、その長手軸回りに回
転駆動されると共にその長手軸に沿って進退駆動される
ようになっている。On the other hand, the upper portion of the hardening agent injection rod 11 is supported by a driving device (not shown), and is driven to rotate about its longitudinal axis and to move back and forth along its longitudinal axis.
【００１７】従って、このような構成を有する装置にお
いて、硬化剤注入ロッド１１を回転させると共に高圧水
噴射ノズル１４から高圧水を噴射しながら地中を進行さ
せ地中に空洞を削孔する。次に、削孔によって生成され
て混濁状態にある排泥中に沈中に沈降凝集剤噴射ノズル
１５から沈降凝集剤を噴射、攪伴し、沈降凝集剤の作用
によって混濁状態にあった排泥を水と泥とに分離する。
水と泥とがある程度分離して水が澄むと直ちに超音波に
よる空洞計測が可能となるので、超音波による空洞計測
を実施する。この計測結果に基き、空洞が所要の大きさ
に達していない場合は、さらに削孔を継続する。一方、
空洞が所要の大きさに形成されていれば、硬化剤噴射ノ
ズル１３から高圧硬化剤を噴射し、空洞中の排泥と硬化
剤を置換する。Therefore, in the apparatus having such a structure, the hardening agent injection rod 11 is rotated and the high pressure water injection nozzle 14 injects high pressure water to advance through the ground to form a cavity in the ground. Next, the sedimentation coagulant injection nozzle 15 injects and agitates the sedimentation coagulant during the sedimentation of the sludge produced by the boring and is in the turbidity state. Is separated into water and mud.
As soon as the water and the mud are separated to some extent and the water becomes clear, the ultrasonic cavity measurement can be performed immediately. Therefore, the ultrasonic cavity measurement is performed. Based on this measurement result, if the cavity has not reached the required size, drilling is continued. on the other hand,
If the cavity is formed in a required size, the high-pressure curing agent is injected from the curing agent injection nozzle 13 to replace the sludge in the cavity with the curing agent.
【００１８】尚、上述の実施例は高圧水噴射ノズルと硬
化剤噴射ノズルを有する例について述べたが、本発明は
これに限定されるものではなく、例えば、高圧水と硬化
剤とで一つのノズルを共用するタイプ、別に高圧エアを
噴射するノズルを有するタイプ、硬化剤を高圧エアで囲
繞して噴射するタイプ等種々の地盤改良体造成装置に適
用することができる。The above embodiment has been described with respect to an example having a high-pressure water jet nozzle and a hardening agent jet nozzle, but the present invention is not limited to this, and for example, one high-pressure water and a hardening agent are used. The present invention can be applied to various types of ground improvement body forming devices such as a type that shares a nozzle, a type that has a nozzle that separately ejects high-pressure air, and a type that surrounds and injects a curing agent with high-pressure air.
【００１９】次に、図２〜図６によって本発明の別の実
施例にかかる具体的な作業要領について説明する。図２
〜図５は作業要領を説明する本発明方法の概略構成図、
図６は作業のタイムチャートである。Next, a concrete working procedure according to another embodiment of the present invention will be described with reference to FIGS. Figure 2
~ Fig. 5 is a schematic configuration diagram of the method of the present invention for explaining the working procedure,
FIG. 6 is a time chart of the work.
【００２０】図２〜図５において、２１は硬化剤注入ロ
ッド、２２はその駆動装置であり、公知のように、駆動
装置２２は硬化剤注入ロッド２１をその長手軸回りに回
転駆動すると共にその長手軸に沿って進退駆動する。ま
た、２３はエアポンプ、２４は高圧ポンプ、２５は硬化
剤タンク、２６は沈降凝集剤タンク、２７は水タンク、
２８は空洞計測システムの制御装置、２９はその監視モ
ニタである。2 to 5, reference numeral 21 is a hardening agent injecting rod, 22 is a driving device thereof, and as is well known, the driving device 22 drives the hardening agent injecting rod 21 to rotate about its longitudinal axis and at the same time. Drive back and forth along the longitudinal axis. Further, 23 is an air pump, 24 is a high pressure pump, 25 is a hardening agent tank, 26 is a sedimentation coagulant tank, 27 is a water tank,
Reference numeral 28 is a controller of the cavity measuring system, and 29 is a monitoring monitor thereof.
【００２１】エアポンプ２３はその出力側配管３０を介
して硬化剤注入ロッド２１内に接続され、該エアポンプ
２３から供給された高圧エアは硬化剤注入ロッド２１の
周面に設けられた噴射ノズル３１（図３参照）から噴射
されるようになっている。本実施例では、該噴射ノズル
３１は、中心口とそれを取り囲む外周口とからなる二重
開口構造をなし、エアはその外周口から噴射される。ま
た、この噴射ノズル３１は硬化剤噴射と沈降凝集剤噴射
とを兼用するものであり、後述する切換弁の操作によっ
て噴射される媒体が変更される。The air pump 23 is connected to the hardener injection rod 21 through the output side pipe 30, and the high-pressure air supplied from the air pump 23 is an injection nozzle 31 (provided on the peripheral surface of the hardener injection rod 21. (See FIG. 3). In this embodiment, the injection nozzle 31 has a double opening structure including a central opening and an outer peripheral opening surrounding the central opening, and air is ejected from the outer peripheral opening. Further, the injection nozzle 31 serves both as the injection of the hardening agent and the injection of the sedimentation coagulant, and the medium to be injected is changed by the operation of the switching valve described later.
【００２２】一方、硬化剤タンク２５及び沈降凝集剤タ
ンク２６にそれぞれ接続された配管３２、３３は切換弁
３４によって配管３５に択一的に連通するようにされ、
また、この配管３５は水タンク２７に接続された配管３
６と第二の切換弁３７で合流し、この切換弁３７によっ
て択一的に配管３８に連通する。配管３８は高圧ポンプ
２４の入力側に接続されると共に、高圧ポンプ２４の出
力側配管３９は硬化剤注入ロッド２１内の図示しない噴
射管に接続され、該噴射管に連通する前記噴射ノズル３
１の中心口に連通している。On the other hand, the pipes 32 and 33 respectively connected to the hardening agent tank 25 and the sedimentation flocculant tank 26 are made to selectively communicate with the piping 35 by a switching valve 34.
Further, this pipe 35 is a pipe 3 connected to the water tank 27.
6 and the second switching valve 37, and the switching valve 37 selectively communicates with the pipe 38. The pipe 38 is connected to the input side of the high pressure pump 24, the output side pipe 39 of the high pressure pump 24 is connected to an injection pipe (not shown) in the hardening agent injection rod 21, and the injection nozzle 3 communicates with the injection pipe.
It communicates with the center of 1.
【００２３】噴射管は硬化剤注入ロッド２１の先端には
先端方向に噴射するための噴射開口４０を有し、該開口
４０は噴射管内にボールを落下させることによってその
ボールによって閉塞される。The injection pipe has an injection opening 40 at the tip of the curing agent injection rod 21 for injecting in the distal direction, and the opening 40 is closed by dropping the ball into the injection pipe.
【００２４】さらに、硬化剤注入ロッド２１の周面には
空洞計測システムの一部をなす超音波センサ４１（図３
参照）が設けられ、地上の前記制御装置２８に接続され
ている。Further, the ultrasonic sensor 41 (FIG. 3) forming a part of the cavity measuring system is provided on the peripheral surface of the hardener injection rod 21.
) Is provided and is connected to the control device 28 on the ground.
【００２５】而して、本発明方法の一実施例の具体的な
作業は次のように行われる。 先ず削孔に当たっては、図２に示すように、噴射開
口４０が開いた状態において、第二の切換弁３７によっ
て水タンク２７を高圧ポンプ２４に連通させる。そし
て、高圧水を硬化剤注入ロッド２１の先端の噴射開口４
０から下方に噴射しながら、硬化剤注入ロッド２１を下
降させることで、所定の深度まで削孔する。The concrete work of one embodiment of the method of the present invention is carried out as follows. First, in drilling, as shown in FIG. 2, the water tank 27 is communicated with the high-pressure pump 24 by the second switching valve 37 with the injection opening 40 opened. Then, the high-pressure water is injected into the injection opening 4 at the tip of the hardening agent injection rod 21.
While injecting downward from 0, the hardening agent injection rod 21 is lowered to drill a hole to a predetermined depth.
【００２６】 次に、図示しないボールにより噴射開
口４０を閉塞した後、図３に示すように切換弁３４、３
７を操作して、硬化剤タンク２５を高圧ポンプ２４に連
通させる。そして、高圧硬化剤を噴射ノズル３１の中心
口から、高圧エアを噴射ノズル３１の外周口から横方向
に噴射しつつ、硬化剤注入ロッド２１を回転させながら
引き上げて行く。Next, after closing the injection opening 40 with a ball (not shown), as shown in FIG.
7 is operated to connect the curing agent tank 25 to the high pressure pump 24. Then, while the high-pressure curing agent is ejected from the central opening of the ejection nozzle 31 and the high-pressure air is ejected laterally from the outer peripheral opening of the ejection nozzle 31, the curing agent injection rod 21 is rotated and pulled up.
【００２７】また、超音波センサ４１から超音波を発
信、受信する。このときはまだ、硬化剤、すなわち地盤
改良剤の影響で空洞の測定はできないが、引き上げ開始
より記録をとる。Further, ultrasonic waves are transmitted and received from the ultrasonic sensor 41. At this time, the cavity cannot be measured due to the effect of the curing agent, that is, the ground improvement agent, but a record is taken from the start of pulling.
【００２８】 任意の深度まで引き上げたら硬化剤注
入ロッド２１の引き上げ中止し、図４に示すように、切
換弁３４を切換えて硬化剤の代わりに沈降凝集剤を硬化
剤注入ロッド２１に導入し、噴射ノズル３１から高圧の
沈降凝集剤を噴射する。When the hardener injection rod 21 is pulled up to an arbitrary depth, the hardener injection rod 21 is stopped from being raised, and as shown in FIG. 4, the switching valve 34 is switched to introduce the settling coagulant into the hardener injection rod 21 instead of the hardener. The high pressure sedimentation coagulant is injected from the injection nozzle 31.
【００２９】この沈降凝集剤の混入により、空洞内の
「硬化剤と土（泥）」は数秒で「水」と分離して硬化剤
と土は沈澱し、直ちに空洞計測システムによる計測が可
能となる。By mixing the sedimentation coagulant, the "hardening agent and soil (mud)" in the cavity are separated from "water" in a few seconds, and the hardening agent and the soil are settled, which enables immediate measurement by the cavity measuring system. Become.
【００３０】これにより、空洞の水平断面の方向性のあ
る寸法形状が測定できる。また、硬化剤注入ロッド２１
を引き上げた長さから鉛直方向の寸法が測定でき、これ
らを合成することで空洞の寸法形状を立体的に測定する
ことが可能となる。This makes it possible to measure the directional dimension of the horizontal cross section of the cavity. In addition, the curing agent injection rod 21
The dimension in the vertical direction can be measured from the pulled-up length, and by combining these, the dimension and shape of the cavity can be three-dimensionally measured.
【００３１】 次に、測定値を得たら、図５に示すよ
うに、再び硬化剤の影響が十分現れるところまで、すな
わち硬化剤が沈澱しているところまで硬化剤注入ロッド
２１を下げ、切換弁３４を切り換えて再び硬化剤を噴射
ノズル３１から噴射しながら、硬化剤注入ロッド２１を
引き上げて行く。Next, when the measured value is obtained, as shown in FIG. 5, the curing agent injection rod 21 is lowered until the effect of the curing agent appears sufficiently, that is, until the curing agent is precipitated, and the switching valve The curing agent injection rod 21 is pulled up while switching 34 and injecting the curing agent from the injection nozzle 31 again.
【００３２】 そして、上記〜を繰り返して、図
６のタイムチャートに示すように、一つの地盤改良体造
成で数回行うことにより、精度の高い地盤改良体を造成
する。Then, by repeating the above steps, as shown in the time chart of FIG. 6, by carrying out several times with one ground improvement body formation, a highly accurate ground improvement body is formed.
【００３３】このように、本実施例では造成される地盤
改良体が地上の監視モニタ２８やその他記録計などによ
りリアルタイムで迅速に測定できるので、正確な地盤改
良体の造成施工が可能となる。また、地盤改良体の全体
の形状を立体的に把握することで、任意の位置の水平断
面、鉛直断面が容易に得られ、既改造部や隣接構造物さ
らに土質との関係もつかめ、例えば地下ダム、堤防遮水
壁、シールド工事など遮水性を要求される工事も可能と
なる。As described above, in the present embodiment, the ground improvement body to be formed can be rapidly measured in real time by the ground monitoring monitor 28 and other recorders, so that accurate ground improvement body construction can be performed. Also, by grasping the overall shape of the ground improvement body in three dimensions, it is possible to easily obtain horizontal and vertical sections at arbitrary positions. It will also be possible to carry out construction work that requires water impermeability, such as dams, embankment impermeable walls, and shield construction.
【００３４】[0034]
【発明の効果】以上、実施例を挙げて詳細に説明したよ
うに本発明によれば、地盤改良体造成工法において、沈
降凝集剤を噴射することで速やかに水と泥、硬化剤等が
分離するので、直ちに超音波による空洞の計測が可能と
なる。従って、削孔と硬化剤置換を同時進行で施工で
き、作業能率を低下させることなく、造成される改良体
の大きさを正確に管理、把握することができる。As described above in detail with reference to the examples, according to the present invention, in the ground improvement body construction method, water and mud, a hardening agent, etc. are promptly separated by injecting a sedimentation coagulant. Therefore, the cavity can be immediately measured by ultrasonic waves. Therefore, drilling and replacement of the curing agent can be carried out simultaneously, and the size of the improved body to be formed can be accurately controlled and grasped without lowering the work efficiency.
【図１】 本発明の一実施例にかかる地盤改良体造成装
置の要部の構成図FIG. 1 is a configuration diagram of a main part of a ground improvement body construction device according to an embodiment of the present invention.
【図２】 作業要領を説明する本発明の一実施例の概略
構成図FIG. 2 is a schematic configuration diagram of an embodiment of the present invention for explaining a work procedure.
【図３】 作業要領を説明する本発明の一実施例の概略
構成図FIG. 3 is a schematic configuration diagram of an embodiment of the present invention for explaining a work procedure.
【図４】 作業要領を説明する本発明の一実施例の概略
構成図FIG. 4 is a schematic configuration diagram of an embodiment of the present invention for explaining a work procedure.
【図５】 作業要領を説明する本発明の一実施例の概略
構成図FIG. 5 is a schematic configuration diagram of an embodiment of the present invention for explaining a work procedure.
【図６】 本発明の一実施例の硬化剤注入ロッドの昇降
運動のタイムチャートFIG. 6 is a time chart of the vertical movement of the curing agent injection rod according to the embodiment of the present invention.
１１、２１ 硬化剤注入ロッド １２ 掘削ビット １３ 硬化剤噴射ノズル １４ 高圧水噴射ノズル １５ 沈降凝集剤噴射ノズル １６、４１ 超音波センサ ２２ 駆動装置 ２３ エアポンプ ２４ 高圧ポンプ ２５ 硬化剤タンク ２６ 沈降凝集剤タンク ２７ 水タンク ２８ 制御装置 ２９ 監視モニタ ３１ 噴射ノズル ３４、３７ 切換弁 11, 21 Hardener injection rod 12 Drilling bit 13 Hardener jet nozzle 14 High pressure water jet nozzle 15 Sedimentation coagulant jet nozzle 16, 41 Ultrasonic sensor 22 Drive device 23 Air pump 24 High pressure pump 25 Hardener tank 26 Sedimentation flocculant tank 27 Water tank 28 Control device 29 Monitoring monitor 31 Injection nozzles 34, 37 Switching valve
Claims (5)
ら硬化剤を高圧で噴射しつつ該硬化剤注入ロッドを引き
上げることによって地盤改良体を対象地盤に造成する地
盤改良体造成工法において、削孔後、混濁状態にある排
泥中に沈降凝集剤を噴射、攪伴して排泥中の水と泥とを
分離させた後、削孔された空洞を超音波で計測し、続い
て硬化剤を噴射注入することを特徴とする地盤改良体造
成工法。1. A ground improvement body construction method for forming a ground improvement body on a target ground by drilling a hole in the ground and then pulling up the hardening agent injection rod while injecting the hardening agent from the hardening agent injection rod at a high pressure. After drilling, the sedimented coagulant was injected into the turbid mud, and the water and mud in the mud were separated by stirring, and the cavities drilled were ultrasonically measured. A method for constructing a ground improvement body, which comprises injecting a curing agent by injection.
ら硬化剤を高圧で噴射しつつ該硬化剤注入ロッドを引き
上げることによって地盤改良体を対象地盤に造成する地
盤改良体造成工法において、削孔された空洞内に硬化剤
を噴射した後、沈降凝集剤を噴射して排泥中の泥と硬化
剤とを水から分離沈澱させた後、削孔された空洞を超音
波で計測することを特徴とする地盤改良体造成工法。2. A ground improvement body construction method for forming a ground improvement body on a target ground by pulling up the hardening agent injection rod while injecting the hardening agent from the hardening agent injection rod at a high pressure after drilling a hole in the ground. , After injecting the hardening agent into the drilled cavity, spray the sedimentation coagulant to separate and precipitate the mud in the sludge and the hardening agent from the water, and then measure the drilled cavity with ultrasonic waves. A ground improvement body construction method characterized by:
ら、前記空洞内の複数の地点で前記硬化剤噴射、前記沈
降凝集剤噴射、前記超音波計測を行うことを特徴とする
請求項２に記載の地盤改良体造成工法。3. The hardening agent injection rod, the sedimentation coagulant injection, and the ultrasonic measurement are performed at a plurality of points in the cavity while gradually raising the hardening agent injection rod. Ground improvement body construction method.
ら硬化剤を高圧で噴射しつつ該硬化剤注入ロッドを引き
上げることによって地盤改良体を対象地盤に造成する地
盤改良体造成装置において、前記硬化剤注入ロッドに、
硬化剤噴射ノズルに隣接して、沈降凝集剤を噴射するノ
ズルと、空洞を計測する超音波センサとが具えられたこ
とを特徴とする地盤改良体造成装置。4. A ground improvement body forming device for forming a ground improvement body on a target ground by pulling up the hardening agent injection rod while injecting the hardening agent from the hardening agent injection rod at a high pressure after drilling a hole in the ground. , The curing agent injection rod,
A ground improvement body constructing device comprising a nozzle for injecting a sedimentation coagulant and an ultrasonic sensor for measuring a cavity, which is adjacent to a hardening agent injection nozzle.
ら硬化剤を高圧で噴射しつつ該硬化剤注入ロッドを引き
上げることによって地盤改良体を対象地盤に造成する地
盤改良体造成装置において、硬化剤噴射ノズルに隣接し
て前記硬化剤注入ロッドに空洞計測システムの超音波セ
ンサが具えられると共に、硬化剤に代えて前記硬化剤噴
射ノズルから沈降凝集剤を噴射させる装置が設けられた
ことを特徴とする地盤改良体造成装置。5. A ground improvement body forming apparatus for forming a ground improvement body on a target ground by drilling a hole in the ground and then pulling up the hardening agent injection rod while injecting the hardening agent from the hardening agent injection rod at high pressure. An ultrasonic sensor of a cavity measuring system is provided in the curing agent injection rod adjacent to the curing agent injection nozzle, and a device for injecting a sedimentation coagulant from the curing agent injection nozzle instead of the curing agent is provided. A soil improvement body building device.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4354062A JP2968407B2 (en) | 1992-09-24 | 1992-12-15 | Ground improvement body construction method and equipment |
| DE19934313476 DE4313476A1 (en) | 1992-09-24 | 1993-04-24 | Ground reinforcing and compacting method for construction sites - using injection of reinforcing material into ultrasonically measured ground cavity |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4-279520 | 1992-09-24 | ||
| JP27952092 | 1992-09-24 | ||
| JP4354062A JP2968407B2 (en) | 1992-09-24 | 1992-12-15 | Ground improvement body construction method and equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06158638A true JPH06158638A (en) | 1994-06-07 |
| JP2968407B2 JP2968407B2 (en) | 1999-10-25 |
Family
ID=26553373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4354062A Expired - Fee Related JP2968407B2 (en) | 1992-09-24 | 1992-12-15 | Ground improvement body construction method and equipment |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2968407B2 (en) |
| DE (1) | DE4313476A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005264679A (en) * | 2004-03-22 | 2005-09-29 | Fudo Constr Co Ltd | Muddy water classifying technique |
| JP2007016507A (en) * | 2005-07-08 | 2007-01-25 | Taisei Corp | Ground improvement method and reinforcing method of existing structural foundation |
| JP2019196595A (en) * | 2018-05-07 | 2019-11-14 | 小野田ケミコ株式会社 | Ground improvement method |
| JP2019196594A (en) * | 2018-05-07 | 2019-11-14 | 小野田ケミコ株式会社 | Ground improvement method |
| JP2020012295A (en) * | 2018-07-18 | 2020-01-23 | 清水建設株式会社 | Improvement body measurement device and improvement body measurement method |
| JP2020165862A (en) * | 2019-03-29 | 2020-10-08 | 株式会社大林組 | Measuring system of underground sound source position |
| JP2021080755A (en) * | 2019-11-20 | 2021-05-27 | 株式会社竹中土木 | Ground improvement body and buried object measuring device, ground improvement body construction device and ground improvement body construction method |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19648548C2 (en) * | 1996-11-25 | 2002-09-26 | Bilfinger Berger Ag | Procedures for quality assurance of injection experience or nozzle jet procedures |
| AT409007B (en) * | 1997-10-28 | 2002-05-27 | Keller Grundbau Gmbh | PRODUCTION OF EXCAVATIONS AND THEIR FILLING UNDER THE SUBSTRATE FOR THE PURPOSE OF SOIL STABILIZATION |
| NL1010967C2 (en) * | 1998-01-06 | 1999-10-07 | Visser & Smit Bouw Bv | Measuring shape and dimensions of underground elements, especially jet grout columns |
| EP1081289A1 (en) * | 1999-09-01 | 2001-03-07 | Visser & Smit Bouw B.V. | Apparatus and method for measuring an underground construction element |
| DE10236257A1 (en) * | 2002-08-09 | 2004-02-26 | Stump Spezialtiefbau Gmbh | Ground jet system of suspension and air feed fits suspension outlets in end of nozzle support at angle to drillrod so suspension feeds via ball valve to outlets as nozzle support rotates. |
-
1992
- 1992-12-15 JP JP4354062A patent/JP2968407B2/en not_active Expired - Fee Related
-
1993
- 1993-04-24 DE DE19934313476 patent/DE4313476A1/en not_active Withdrawn
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005264679A (en) * | 2004-03-22 | 2005-09-29 | Fudo Constr Co Ltd | Muddy water classifying technique |
| JP4558360B2 (en) * | 2004-03-22 | 2010-10-06 | 株式会社不動テトラ | Mud moisture class method |
| JP2007016507A (en) * | 2005-07-08 | 2007-01-25 | Taisei Corp | Ground improvement method and reinforcing method of existing structural foundation |
| JP4520913B2 (en) * | 2005-07-08 | 2010-08-11 | 大成建設株式会社 | Ground improvement method and existing structure foundation reinforcement method |
| JP2019196595A (en) * | 2018-05-07 | 2019-11-14 | 小野田ケミコ株式会社 | Ground improvement method |
| JP2019196594A (en) * | 2018-05-07 | 2019-11-14 | 小野田ケミコ株式会社 | Ground improvement method |
| JP2020012295A (en) * | 2018-07-18 | 2020-01-23 | 清水建設株式会社 | Improvement body measurement device and improvement body measurement method |
| JP2020165862A (en) * | 2019-03-29 | 2020-10-08 | 株式会社大林組 | Measuring system of underground sound source position |
| JP2021080755A (en) * | 2019-11-20 | 2021-05-27 | 株式会社竹中土木 | Ground improvement body and buried object measuring device, ground improvement body construction device and ground improvement body construction method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2968407B2 (en) | 1999-10-25 |
| DE4313476A1 (en) | 1994-03-31 |
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