JP2012158946A - Formation device of underground pile - Google Patents

Formation device of underground pile Download PDF

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JP2012158946A
JP2012158946A JP2011020456A JP2011020456A JP2012158946A JP 2012158946 A JP2012158946 A JP 2012158946A JP 2011020456 A JP2011020456 A JP 2011020456A JP 2011020456 A JP2011020456 A JP 2011020456A JP 2012158946 A JP2012158946 A JP 2012158946A
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pressure injection
injection liquid
injection
body rod
main body
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Fumiko Fukuoka
富美子 福岡
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GEO KANKYO RES CT Ltd
GEO KANKYO RESEARCH CENTER Ltd
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GEO KANKYO RES CT Ltd
GEO KANKYO RESEARCH CENTER Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a formation device of an underground pile, capable of preventing deviation and large vibrations of a body rod, improving durability of the device, preventing breakage, fixing a collision pressure of cement milk to the ground inside a vertical hole, improving the accuracy of the underground pile to be formed, and keeping quality uniform, by forming a pair of high pressure spray nozzles at the right angle to the axial direction of an injection path.SOLUTION: An injection path 3 of high pressure injection liquid 2 is provided in the axial direction to form a body rod 1, and a lower end nozzle 7 of the high pressure injection liquid 2 is formed through a check valve 6 to be opened only in a jetting direction of the high pressure injection liquid 2 is formed at the lower end of the body rod 1. Also, on the injection side of the high pressure injection liquid 2 of the check valve 6, a closing valve seat 11 for cutting off the jetting of the high pressure injection liquid 2 to the direction of the lower end nozzle 7 by the feed of a closing piece is formed. On the injection side of the high pressure injection liquid 2 of the closing valve seat 11 and on both sides of the injection path 3, a pair of high pressure jetting nozzles 13 of the high pressure injection liquid 2 are formed at the right angle to the axial direction of the injection path 3 and coaxially.

Description

本発明は、建物基礎、構造物防護、盛り土等の滑り破壊防止、軌道基礎等として地盤中に形成し地盤を安定化させるための地中杭の形成装置に係るものである。   The present invention relates to an underground pile forming apparatus for stabilizing a ground formed in a ground as a building foundation, structure protection, prevention of slip breakage such as embankment, and a track foundation.

特開平９−２８７１３６号公報 従来、地中杭を形成する場合は、特許文献１に示す如く本体ロッドの先端から高圧水を噴射しながら縦孔を形成し、この縦孔の完成後に本体ロッドの側面の１カ所に形成した高圧噴射ノズルからセメントミルクを側方に噴射して地盤を粉砕し、縦孔を拡開しながらセメントミルクと粉砕地盤とを攪拌混合して地中杭を形成する事が行われている。JP, 9-287136, A Conventionally, when forming an underground pile, as shown in patent documents 1, forming a vertical hole while injecting high-pressure water from the tip of a main body rod, and after completion of this vertical hole, Cement milk is sprayed laterally from a high-pressure spray nozzle formed at one side of the side to crush the ground, and the cement milk and ground ground are stirred and mixed while expanding the vertical holes to form underground piles. Has been done.

しかしながら、縦孔を拡開するためのセメントミルクの噴射は本体ロッドの側面の１カ所に形成した高圧噴射ノズルから行われている。そのため、本体ロッドの一方にのみ噴射圧の反力が加えられ、本体ロッドにブレや大きな振動が発生し易く装置の耐久性を減少させたり、破損の原因となっている。また、本体ロッドにブレや大きな振動が発生する結果として、縦孔内での地盤に対するセメントミルクの衝突圧が場所毎に異なるものとなり、拡開される杭が設計形状とは異なる不定型なものとなる欠点を有している。そのため、造成される地中杭の精度に誤差が生じ易く、品質不良を発生させるものであった。また、高圧噴射ノズルが１個の場合は、本体ロッドの１回転に付いて１回しか地盤に対する掘削を行う事ができず、作業効率が悪いものとなる。   However, the injection of cement milk for expanding the vertical hole is performed from a high-pressure injection nozzle formed at one place on the side surface of the main body rod. Therefore, the reaction force of the injection pressure is applied only to one of the main body rods, and the main body rod is liable to be shaken or greatly oscillated, thereby reducing the durability of the apparatus or causing damage. In addition, as a result of vibrations and large vibrations in the main body rod, the impact pressure of cement milk against the ground in the vertical hole will be different from place to place, and the piles to be expanded will be irregularly shaped different from the design shape Has the following disadvantages. For this reason, errors are likely to occur in the accuracy of the underground pile to be created, resulting in poor quality. In addition, when there is one high-pressure injection nozzle, excavation can be performed on the ground only once per rotation of the main body rod, resulting in poor work efficiency.

そこで、本願発明は上述の如き課題を解決しようとするものであって、縦孔を拡開するためのセメントミルクの噴射を本体ロッドの側面から行いながら、本体ロッドにブレや大きな振動が発生させる事が無く、装置の耐久性を従来方法に比較して向上したり、破損を生じる事がないようにする。また、本体ロッドにブレや大きな振動を生じる事がないから、縦孔内での地盤に対するセメントミルクの衝突圧が一定となり、拡開される杭を設計形状に保つ事が出来るようにし、造成される地中杭の精度を向上し、品質を均一に保つ事が出来るようにしようとするものである。また、本体ロッドの１回転について複数回の掘削を行い、効率の良い作業を可能とする。   Accordingly, the present invention is intended to solve the above-described problems, and causes the main body rod to shake and generate large vibrations while performing cement milk injection from the side surface of the main body rod for expanding the vertical holes. There is nothing, and the durability of the apparatus is improved compared to the conventional method, and damage is not caused. In addition, since the main body rod does not shake or vibrate greatly, the impact pressure of cement milk against the ground in the vertical hole is constant, and the pile that is expanded can be kept in the design shape and created. It is intended to improve the accuracy of underground piles so that the quality can be kept uniform. In addition, excavation is performed a plurality of times for one rotation of the main body rod to enable efficient work.

本発明は上述の如き課題を解決するため、高圧注入液の注入路を軸方向に設けて本体ロッドを形成する。そして、この本体ロッドの下端に、高圧注入液の噴射方向にのみ開弁する逆止弁を介して高圧注入液の下端ノズルを形成する。この高圧注入液は通常の水を用いる事が出来、高圧の水によって縦孔を掘削形成する。また、地中の水脈等と下端ノズルが交差し下端ノズルから高圧水が逆流した場合にも逆止弁によってその逆流を阻止する事が可能となる。     In order to solve the above-described problems, the present invention forms a main body rod by providing an injection path for a high-pressure injection solution in the axial direction. And the lower end nozzle of a high-pressure injection liquid is formed in the lower end of this main body rod through the non-return valve which opens only in the injection direction of a high-pressure injection liquid. This high-pressure injection liquid can use normal water, and a vertical hole is formed by excavation with high-pressure water. In addition, even when underground water veins and the lower end nozzle intersect and high pressure water flows backward from the lower end nozzle, the check valve can prevent the reverse flow.

また、逆止弁の高圧注入液側に、閉止駒の投入により下端ノズル方向への高圧注入液の噴出を遮断する閉止弁座を形成する。そして、この閉止弁座の高圧注入液の注入側で注入路の両側に、高圧注入液の高圧噴射ノズルを注入路の軸方向に対して直角に一対形成する。このように形成したものに於いて、縦孔を掘削形成を完了した本体ロッドの高圧注入液の注入路に、鉄球等の閉止駒を投入する。この閉止駒は閉止弁座に突き当たり、下端ノズル方向への高圧注入液の噴出を遮断する。この遮断後に本体ロッドの注入路にセメントミルクで構成される高圧注入液を注入すれば、この高圧注入液は高圧噴射ノズルから噴出する。この高圧噴射ノズルは、注入路の軸方向に対して直角に一対形成しているから、高圧注入液の噴出に対応して本体ロッドに加えられる反力が、本体ロッドに対して一方に偏ることなく均一となり、本体ロッドのブレや、大きな振動が発生させる事が無く、装置の耐久性を向上したり、破損を生じる事がない。また、本体ロッドにブレや大きな振動を生じる事がないから、縦孔内での地盤に対するセメントミルクの衝突圧が一定となり、拡開される杭を設計形状に保つ事ができ、造成される地中杭の精度を向上し、品質を均一に保つ事が出来るようにできるものである。また、縦孔の拡開時には、本体ロッドの１回転に於いて２回の掘削を地盤に加える事が出来るから効率の良い掘削作業を可能とする。   Further, a closing valve seat is formed on the high pressure injection liquid side of the check valve to block the injection of the high pressure injection liquid toward the lower end nozzle by inserting a closing piece. Then, a pair of high-pressure injection nozzles for the high-pressure injection liquid is formed at right angles to the axial direction of the injection path on both sides of the injection path on the injection side of the high-pressure injection liquid of the closing valve seat. In the case formed in this way, a closing piece such as an iron ball is introduced into the injection path of the high-pressure injection liquid of the main body rod in which the vertical hole has been excavated and formed. The closing piece abuts against the closing valve seat and blocks the injection of the high-pressure injection liquid toward the lower end nozzle. If a high-pressure injection liquid composed of cement milk is injected into the injection path of the main body rod after the blocking, this high-pressure injection liquid is ejected from the high-pressure injection nozzle. Since the high-pressure injection nozzles are formed in a pair at right angles to the axial direction of the injection path, the reaction force applied to the main body rod in response to the injection of the high-pressure injection liquid is biased to one side with respect to the main body rod. It becomes uniform, and there is no occurrence of blurring of the main body rod or large vibrations, so that the durability of the device is not improved or breakage occurs. In addition, since there is no vibration or large vibrations in the main body rod, the collision pressure of cement milk against the ground in the vertical hole is constant, and the expanded pile can be kept in the design shape, and the ground to be created It can improve the accuracy of the middle pile and keep the quality uniform. In addition, when the vertical hole is expanded, two excavations can be added to the ground in one rotation of the main body rod, thereby enabling efficient excavation work.

また、上記の第１発明では高圧注入液の高圧噴射ノズルを、本体ロッドに直接、注入路の軸方向に対して直角に一対形成している。しかし、第２の発明では高圧噴射ノズルの形成位置を第１発明とは異なるものとしている。すなわち、高圧注入液の注入路を軸方向に設けて本体ロッドを形成し、この本体ロッドの下端に、高圧注入液の噴射方向にのみ開弁する逆止弁を介して高圧注入液の下端ノズルを形成するとともに逆止弁の高圧注入液側に、閉止駒の投入により下端ノズル方向への高圧注入液の噴出を遮断する閉止弁座を形成するとともに、この閉止弁座の高圧注入液の注入側で注入路の両側に、高圧注入液の噴出口を注入路の軸方向に対して直角に一対形成する構成に於いては第１発明と第２発明は同一である。そして、前記噴出口に連通する連通路を、本体ロッドの両側に突出した攪拌翼内の軸方向に一対形成し、この連通路の先端を高圧注入液の高圧噴射ノズルとする点に於いて第１発明と第２発明は異なるものである。   In the first invention, a pair of high-pressure injection nozzles for high-pressure injection is formed directly on the main body rod at right angles to the axial direction of the injection path. However, in the second invention, the formation position of the high pressure injection nozzle is different from that of the first invention. That is, a main body rod is formed by providing an injection path for the high pressure injection liquid in the axial direction, and a lower end nozzle for the high pressure injection liquid is provided at the lower end of the main body rod via a check valve that opens only in the injection direction of the high pressure injection liquid. And forming a closing valve seat on the high pressure injection liquid side of the check valve to block the injection of the high pressure injection liquid in the direction of the lower end nozzle by inserting the closing piece, and the high pressure injection liquid injection side of this closing valve seat Thus, the first and second inventions are the same in the configuration in which a pair of high-pressure injection nozzles are formed on both sides of the injection channel at right angles to the axial direction of the injection channel. A pair of communication passages communicating with the jet outlet is formed in the axial direction in the stirring blade protruding on both sides of the main body rod, and the tip of the communication passage is used as a high-pressure injection nozzle for high-pressure injection liquid. The first invention and the second invention are different.

前記の第１発明に於いては、作業目的の地盤が岩、砂利等の少ないものである場合に、高圧注入液の圧力のみで縦孔の直径を拡開していく場合に適したものであり、前記の第２発明に於いては、地盤が岩、砂利等の多い構成の場合に攪拌翼でも縦孔の直径を拡開する作業を行う場合とか、この拡開作業の精度を向上しようとする場合、またセメントミルクと掘削した地盤との混合を更に確実に行う場合に適したものとなる。   In the first aspect of the invention, when the ground for the work is a rock, gravel or the like, it is suitable for expanding the diameter of the vertical hole only by the pressure of the high-pressure injection liquid. In the second aspect of the invention, when the ground is composed of rocks, gravel, etc., the work of expanding the diameter of the vertical hole with the stirring blade is performed, or the accuracy of this expansion work should be improved. And when mixing cement milk and excavated ground more reliably.

また、高圧注入液は、セメントミルクであっても良い。このセメントミルクは縦孔を拡開し地盤と混合して地中杭を形成する場合に用いるものである。   Moreover, the high-pressure injection liquid may be cement milk. This cement milk is used when the vertical hole is expanded and mixed with the ground to form an underground pile.

また、高圧注入液は、水であっても良い。この水は、本体ロッドの下端から噴射し縦孔を形成する場合に主に使用するものである。縦孔を形成する場合にセメントミルクを用いても良い。   The high-pressure injection liquid may be water. This water is mainly used when a vertical hole is formed by jetting from the lower end of the main body rod. Cement milk may be used when forming the vertical holes.

本発明は上述の如く、高圧噴射ノズルは、注入路の軸方向に対して直角に一対形成しているから、高圧注入液の噴出に対応して本体ロッドに加えられる反力が、本体ロッドに対して一方に偏ることなく均一となり、本体ロッドのブレや、大きな振動が発生させる事が無く、装置の耐久性を向上したり、破損を生じる事がない。また、本体ロッドにブレや大きな振動を生じる事がないから、縦孔内での地盤に対するセメントミルクの衝突圧が一定となり、拡開される杭を設計形状に保つ事ができ、造成される地中杭の精度を向上し、品質を均一に保つ事ができものである。また、縦孔の拡開時には、本体ロッドの１回転に於いて２回の掘削を地盤に加える事が出来るから効率の良い掘削作業を可能とする。   In the present invention, as described above, since the high-pressure injection nozzles are formed in a pair at right angles to the axial direction of the injection path, the reaction force applied to the main body rod in response to the injection of the high-pressure injection liquid is applied to the main body rod. On the other hand, it is uniform without being biased to one side, and there is no occurrence of blurring of the main body rod or large vibrations, so that the durability of the apparatus is not improved or breakage occurs. In addition, since there is no vibration or large vibrations in the main body rod, the collision pressure of cement milk against the ground in the vertical hole is constant, and the expanded pile can be kept in the design shape, and the ground to be created The accuracy of the middle pile can be improved and the quality can be kept uniform. In addition, when the vertical hole is expanded, two excavations can be added to the ground in one rotation of the main body rod, thereby enabling efficient excavation work.

第１発明の作業工程の一例を示す概略断面図。The schematic sectional drawing which shows an example of the operation | work process of 1st invention. 第１発明の本体ロッドの部分拡大図。The elements on larger scale of the main body rod of 1st invention. 図２のＡ−Ａ線断面図で、縦孔形成のために高圧注入液を噴射している状態を示している。It is the sectional view on the AA line of FIG. 2, and has shown the state which is injecting the high pressure injection liquid for vertical hole formation. 注入路に閉止駒を投入して閉止弁座を遮断し、縦孔の拡開を行っている状態を示す断面図。Sectional drawing which shows the state which throws the closing piece into the injection path, interrupts | blocks a closing valve seat, and is expanding the vertical hole. 第２発明の作業工程の一例を示す概略断面図。The schematic sectional drawing which shows an example of the operation | work process of 2nd invention. 第２発明の本体ロッドの部分拡大図。The elements on larger scale of the main body rod of 2nd invention. 図６のＢ−Ｂ線断面図で、縦孔形成のために高圧注入液を噴射している状態を示している。It is the BB sectional drawing of FIG. 6, and has shown the state which is injecting the high pressure injection liquid for vertical hole formation. 注入路に閉止駒を投入して閉止弁座を遮断し、縦孔の拡開を行っている状態を示す断面図。Sectional drawing which shows the state which throws the closing piece into the injection path, interrupts | blocks a closing valve seat, and is expanding the vertical hole.

以下、第１発明の実施例を図１〜図４に於いて説明すると、（１）は本体ロッドで、セメントミルク、水等を高圧とした高圧注入液(２)の注入路(３)を軸方向に設けている。この本体ロッド(１)は、地表面に設置した制御機構(４)により回動及び上下動可能としている。また、本体ロッド(１)にはセメントミルク、水等の高圧注入液(２)を注入路(３)に導入するための導入管(５)を接続している。   The embodiment of the first invention will be described below with reference to FIGS. 1 to 4. (1) is a main body rod, and a high-pressure injection liquid (2) injection path (3) with high pressure such as cement milk and water is provided. It is provided in the axial direction. The main body rod (1) can be rotated and moved up and down by a control mechanism (4) installed on the ground surface. The main body rod (1) is connected to an introduction pipe (5) for introducing a high-pressure injection liquid (2) such as cement milk and water into the injection path (3).

また、本体ロッド(１)の下端には、高圧注入液(２)の噴射方向にのみ開弁する逆止弁(６)を介して高圧注入液(２)の下端ノズル(７)を形成している。逆止弁(６)は、高圧注入液(２)の注入によってのみ開弁するよう、スプリング(８)で注入方向に付勢されている。そして、地中の水脈等と下端ノズル(７)が接触し下端ノズル(７)から高圧水が逆流した場合にも、逆止弁(６)によってその逆流を阻止する事が可能となる。また、下端ノズル(７)の外周には地中掘削用のカッター(１０)を配置している。   Further, a lower end nozzle (7) of the high pressure injection liquid (2) is formed at the lower end of the main body rod (1) through a check valve (6) that opens only in the injection direction of the high pressure injection liquid (2). ing. The check valve (6) is urged in the injection direction by a spring (8) so as to open only by injection of the high-pressure injection liquid (2). Even when the underground water vein and the lower end nozzle (7) come into contact with each other and high pressure water flows backward from the lower end nozzle (7), the reverse flow can be prevented by the check valve (6). Further, a cutter (10) for underground excavation is disposed on the outer periphery of the lower end nozzle (7).

また、逆止弁(６)の高圧注入液(２)の注入側には閉止弁座(１１)を形成し、注入路(３)に金属球等の閉止駒(１２)を投入することにより閉止弁座(１１)に閉止駒(１２)を突き当てて、下端ノズル(７)方向への高圧注入液(２)の噴出を遮断可能としている。また、この閉止弁座(１１)の高圧注入液(２)の注入側で注入路(３)の両側に、高圧注入液(２)の高圧噴射ノズル(１３)を注入路(３)の軸方向に対して直角且つ同一軸線上に一対形成している。   In addition, a check valve seat (11) is formed on the check valve (6) on the injection side of the high-pressure injection liquid (2), and a closing piece (12) such as a metal ball is inserted into the injection passage (3). A closing piece (12) is abutted against the closing valve seat (11) to block the injection of the high-pressure injection liquid (2) toward the lower end nozzle (7). Moreover, the high pressure injection nozzle (13) of the high pressure injection liquid (2) is provided on both sides of the injection path (3) on the injection side of the high pressure injection liquid (2) of the closing valve seat (11), and the axis of the injection path (3). A pair is formed at right angles to the direction and on the same axis.

上述の如く形成したものに於いて、地盤(１４)中に地中杭(１５)を形成するには、図１(Ａ)に示す如く、本体ロッド(１)を地盤(１４)中に挿入して、制御機構(４)により本体ロッド(１)を回転しながら注入路(３)に水で形成した高圧注入液(２)を注入する。この高圧注入液(２)は、その注入圧力により逆止弁(６)を開弁して下端ノズル(７)から地盤(１４)中に噴出し、その液圧によって地盤(１４)を掘削し、地盤(１４)中に比較的直径の小さな縦孔(１６)を形成する。この縦孔(１６)の形成においては、下端ノズル(７)の外周に形成したカッター(１０)によっても地盤(１４)の掘削が行われる。また、地盤(１４)中に存在する水脈等と下端ノズル(７)が接触し、この水脈の水圧が、高圧注入液(２)の水圧よりも高い場合であっても、逆止弁(６)の存在により注入路(３)に地下水が逆流する事はない。   In order to form the underground pile (15) in the ground (14), the main body rod (1) is inserted into the ground (14) as shown in FIG. 1 (A). Then, the high pressure injection liquid (2) formed of water is injected into the injection path (3) while rotating the main body rod (1) by the control mechanism (4). This high-pressure injection liquid (2) opens the check valve (6) by the injection pressure and is ejected from the lower end nozzle (7) into the ground (14), and the ground (14) is excavated by the liquid pressure. A vertical hole (16) having a relatively small diameter is formed in the ground (14). In the formation of the vertical hole (16), the ground (14) is also excavated by the cutter (10) formed on the outer periphery of the lower end nozzle (7). In addition, even if the water vein or the like existing in the ground (14) is in contact with the lower end nozzle (7) and the water pressure of this water vein is higher than the water pressure of the high-pressure injection liquid (2), the check valve (6 ) Does not cause groundwater to flow back into the injection channel (3).

そして、縦孔(１６)の形成が図１(Ｂ)に示す如く、予定位置まで進行した後は水で形成した高圧注入液(２)の注入路(３)への注入を停止し、図４に示す如く閉止駒(１２)を注入路(３)に投入する。この閉止駒(１２)は閉止弁座(１１)に突き当たり下端ノズル(７)と注入路(３)の連通を遮断する。この下端ノズル(７)と注入路(３)の連通を遮断した状態で、注入路(３)にセメントミルクで形成した高圧注入液(２)を注入すれば、図１(Ｃ)及び図４に示す如く、セメントミルクで形成した高圧注入液(２)は本体ロッド(１)の側方９０度方向に高圧噴射ノズル(１３)から噴出する。   Then, after the formation of the vertical hole (16) has progressed to a predetermined position as shown in FIG. 1 (B), the injection of the high-pressure injection liquid (2) formed of water into the injection path (3) is stopped, As shown in FIG. 4, the closing piece (12) is put into the injection path (3). This closing piece (12) hits the closing valve seat (11) and blocks communication between the lower end nozzle (7) and the injection path (3). When the high-pressure injection liquid (2) formed of cement milk is injected into the injection path (3) in a state where the communication between the lower end nozzle (7) and the injection path (3) is cut off, FIG. 1 (C) and FIG. As shown in FIG. 3, the high-pressure injection liquid (2) formed of cement milk is ejected from the high-pressure injection nozzle (13) in the direction of 90 ° to the side of the main body rod (1).

この高圧噴射ノズル(１３)からのセメントミルクで形成した高圧注入液(２)の噴出によって、図１(Ｃ)に示す如く、縦孔(１６)は直径を拡開され、この噴出状態で本体ロッド(１)を回転させながら上昇させれば、図１(Ｄ)に示す如くセメントミルクで形成した高圧注入液(２)と土壌が攪拌混合され地中杭(１５)が下方から上方に順次形成される。そして、高圧噴射ノズル(１３)は注入路(３)の軸方向に対して直角且つ同軸上に一対形成しているから、セメントミルクで形成した高圧注入液(２)の噴出に対応して本体ロッド(１)に加えられる反力が、本体ロッド(１)に対して一方に偏ることなく両側から均一に加えられるものとなり、本体ロッド(１)のブレや、大きな振動を発生させる事が無い。そのため、装置の耐久性を向上したり、破損を生じる事がない。また、本体ロッド(１)にブレや大きな振動を生じる事がないから、縦孔(１６)内での地盤(１４)に対するセメントミルクで形成した高圧注入液(２)の衝突圧が一定となり、縦孔(１６)を拡開して形成する地中杭(１５)の直径を設計形状に保つ事ができ、造成される地中杭の精度を向上し、品質を均一に保つ事が出来るようにできるものである。また、縦孔(１６)の拡開時には、本体ロッド(１)の１回転に於いて２回の掘削を地盤(１４)に加える事が出来るから効率の良い掘削作業を可能とする。   As shown in FIG. 1 (C), the diameter of the vertical hole (16) is expanded by the ejection of the high-pressure injection liquid (2) formed from cement milk from the high-pressure injection nozzle (13). If the rod (1) is raised while rotating, as shown in FIG. 1 (D), the high-pressure injection liquid (2) formed of cement milk and the soil are mixed with stirring, and the underground pile (15) is sequentially moved from below to above. It is formed. And since the high pressure injection nozzle (13) is formed in a pair perpendicular to the axial direction of the injection passage (3) and coaxially, the main body corresponds to the injection of the high pressure injection liquid (2) formed of cement milk. The reaction force applied to the rod (1) is applied uniformly from both sides without biasing to the main body rod (1), and there is no occurrence of vibration of the main body rod (1) or large vibrations. . For this reason, the durability of the apparatus is not improved and the apparatus is not damaged. Moreover, since the main body rod (1) is not shaken or greatly oscillated, the collision pressure of the high-pressure injection liquid (2) formed with cement milk against the ground (14) in the vertical hole (16) becomes constant, The diameter of the underground pile (15) formed by expanding the vertical hole (16) can be kept in the design shape, so that the accuracy of the underground pile created can be maintained and the quality can be kept uniform. It can be made. Further, when the vertical hole (16) is expanded, two excavations can be added to the ground (14) in one rotation of the main body rod (1), thereby enabling efficient excavation work.

上記実施例に於いては、セメントミルクで形成した高圧注入液(２)を本体ロッド(１)に直接形成した高圧噴射ノズル(１３)から噴射しているが、第２実施例に於いては図６〜図８に示す如く、閉止弁座(１１)の高圧注入液(２)の注入側で注入路(３)の両側に、高圧注入液(２)の噴出口(１７)を注入路(３)の軸方向に対して直角且つ同軸上に一対形成する。そして、この噴出口(１７)に連通する連通路(１８)を、本体ロッド(１)の両側に突出した攪拌翼(１９)内の軸方向に一対形成し、この連通路(１８)の先端を高圧注入液(２)の高圧噴射ノズル(１３)としている。また攪拌翼(１９)の外周にはカッター(１０)を配置し、地盤(１４)の掘削を可能としている。他の構成については第１実施例と同一である。   In the above embodiment, the high pressure injection liquid (2) formed of cement milk is injected from the high pressure injection nozzle (13) formed directly on the main body rod (1). In the second embodiment, As shown in FIGS. 6-8, the injection port (17) of the high pressure injection liquid (2) is provided on both sides of the injection path (3) on the injection side of the high pressure injection liquid (2) of the closing valve seat (11). A pair is formed at right angles and coaxially with the axial direction of (3). A pair of communication passages (18) communicating with the spout (17) is formed in the axial direction of the stirring blade (19) protruding on both sides of the main body rod (1), and the tip of the communication passage (18). Is a high-pressure injection nozzle (13) for high-pressure injection liquid (2). In addition, a cutter (10) is disposed on the outer periphery of the stirring blade (19) to enable excavation of the ground (14). Other configurations are the same as those of the first embodiment.

上述の如く構成したものに於いて、地盤(１４)中に地中杭(１５)を形成するには、図５(Ａ)に示す如く、本体ロッド(１)を地盤(１４)中に挿入して、制御機構(４)により本体ロッド(１)を攪拌翼(１９)と一体に回転しながら注入路(３)に水で形成した高圧注入液(２)を注入する。この高圧注入液(２)は、その注入圧力により逆止弁(６)を開弁して下端ノズル(７)から地盤(１４)中に噴出し、その液圧によって地盤(１４)を掘削し、地盤(１４)中に比較的直径の小さな縦孔(１６)を形成する。この縦孔(１６)の形成においては、下端ノズル(７)の外周に形成したカッター(１０)及び攪拌翼(１９)に形成したカッター(１０)によっても地盤(１４)の掘削が行われる。また、地盤(１４)中に存在する水脈等と下端ノズル(７)が接触し、水脈の水圧が、高圧注入液(２)の水圧よりも高い場合であっても、逆止弁(６)の存在により注入路(３)に地下水が逆流する事はない。   In order to form the underground pile (15) in the ground (14) in the structure as described above, the main body rod (1) is inserted into the ground (14) as shown in FIG. 5 (A). Then, the high pressure injection liquid (2) formed of water is injected into the injection path (3) while rotating the main body rod (1) integrally with the stirring blade (19) by the control mechanism (4). This high-pressure injection liquid (2) opens the check valve (6) by the injection pressure and is ejected from the lower end nozzle (7) into the ground (14), and the ground (14) is excavated by the liquid pressure. A vertical hole (16) having a relatively small diameter is formed in the ground (14). In forming the vertical hole (16), the ground (14) is also excavated by the cutter (10) formed on the outer periphery of the lower end nozzle (7) and the cutter (10) formed on the stirring blade (19). Further, the check valve (6) even if the water vein etc. existing in the ground (14) is in contact with the lower end nozzle (7) and the water pressure of the water vein is higher than the water pressure of the high-pressure injection liquid (2). The groundwater does not flow back into the injection channel (3) due to the presence of water.

縦孔(１６)の形成が図５(Ｂ)に示す如く、予定位置まで進行した後は水で形成した高圧注入液(２)の注入路(３)への注入を停止し、図８に示す如く閉止駒(１２)を注入路(３)に投入する。この閉止駒(１２)は閉止弁座(１１)に突き当たり下端ノズル(７)と注入路(３)の連通を遮断する。この下端ノズル(７)と注入路(３)の連通を遮断した状態で、注入路(３)にセメントミルクで形成した高圧注入液(２)を注入すれば、図５(Ｃ)及び図８に示す如く、セメントミルクで形成した高圧注入液(２)は攪拌翼(１９)先端の高圧噴射ノズル(１３)から本体ロッド(１)の側方９０度方向に噴出する。   After the formation of the vertical holes (16) has progressed to the predetermined position as shown in FIG. 5 (B), the injection of the high-pressure injection liquid (2) formed of water into the injection path (3) is stopped, and FIG. As shown, the closing piece (12) is put into the injection path (3). This closing piece (12) hits the closing valve seat (11) and blocks communication between the lower end nozzle (7) and the injection path (3). If the high-pressure injection liquid (2) formed of cement milk is injected into the injection path (3) in a state where the communication between the lower end nozzle (7) and the injection path (3) is cut off, FIG. 5 (C) and FIG. As shown in FIG. 3, the high-pressure injection liquid (2) formed of cement milk is ejected from the high-pressure injection nozzle (13) at the tip of the stirring blade (19) in the direction of 90 degrees to the side of the main body rod (1).

この高圧噴射ノズル(１３)からのセメントミルクで形成した高圧注入液(２)の噴出によって、図５(Ｃ)に示す如く、縦孔(１６)は直径を拡開され、この噴出状態で本体ロッド(１)及び攪拌翼(１９)を回転しながら上昇させれば、図５(Ｄ)に示す如くセメントミルクで形成した高圧注入液(２)と土壌が攪拌混合され地中杭(１５)が下方から上方に順次形成される。そして、攪拌翼(１９)の先端に設けた高圧噴射ノズル(１３)は、注入路(３)の軸方向に対して直角且つ同軸上に一対形成しているから、セメントミルクで形成した高圧注入液(２)の噴出に対応して本体ロッド(１)に加えられる反力が、本体ロッド(１)に対して一方に偏ることなく両側から均一に加えられるものとなり、本体ロッド(１)のブレや、大きな振動を発生させる事が無い。そのため、装置の耐久性を向上したり、破損を生じる事がない。また、本体ロッド(１)にブレや大きな振動を生じる事がないから、縦孔(１６)内での地盤(１４)に対するセメントミルクで形成した高圧注入液(２)の衝突圧が一定となり、縦孔(１６)を拡開して形成する地中杭(１５)の直径を設計形状に保つ事ができ、造成される地中杭の精度を向上し、品質を均一に保つ事が出来るようにできるものである。また、縦孔(１６)の拡開時には、本体ロッド(１)の１回転に於いて２回の掘削を地盤(１４)に加える事が出来るから効率の良い掘削作業を可能とするものである。   As shown in FIG. 5 (C), the diameter of the vertical hole (16) is expanded by the ejection of the high-pressure injection liquid (2) formed from cement milk from the high-pressure injection nozzle (13). When the rod (1) and the stirring blade (19) are raised while rotating, the high-pressure injection liquid (2) formed with cement milk and the soil are stirred and mixed as shown in FIG. 5 (D), and the underground pile (15) Are formed sequentially from the bottom to the top. The pair of high-pressure injection nozzles (13) provided at the tip of the stirring blade (19) is formed at right angles and coaxially with the axial direction of the injection passage (3). The reaction force applied to the main body rod (1) in response to the ejection of the liquid (2) is uniformly applied from both sides without being biased to the main body rod (1). There is no blurring or large vibration. For this reason, the durability of the apparatus is not improved and the apparatus is not damaged. Moreover, since the main body rod (1) is not shaken or greatly oscillated, the collision pressure of the high-pressure injection liquid (2) formed with cement milk against the ground (14) in the vertical hole (16) becomes constant, The diameter of the underground pile (15) formed by expanding the vertical hole (16) can be kept in the design shape, so that the accuracy of the underground pile created can be maintained and the quality can be kept uniform. It can be made. Further, when the vertical hole (16) is expanded, two excavations can be applied to the ground (14) in one rotation of the main body rod (1), thereby enabling efficient excavation work. .

また、前記の第１実施例に於いては、作業目的の地盤(１４)が岩、砂利等の少ないものである場合に、高圧注入液(２)の圧力のみで縦孔(１６)の直径を拡開していく場合に適したものであり、第２実施例於いては、地盤(１４)が岩、砂利等の多い構成の場合に、高圧注入液(２)とともに攪拌翼(１９)でも縦孔(１６)の直径を拡開する作業を行う場合とか、この拡開作業の精度を向上しようとする場合に適したものとなる。   In the first embodiment, the diameter of the vertical hole (16) can be obtained only by the pressure of the high-pressure injection liquid (2) when the ground (14) for the work is less rock, gravel and the like. In the second embodiment, when the ground (14) has a lot of rock, gravel, etc., the stirring blade (19) together with the high-pressure injection liquid (2) is used. However, this is suitable for the case of performing an operation of expanding the diameter of the vertical hole (16) or for improving the accuracy of the expansion operation.

１ 本体ロッド
２ 高圧注入液
３ 注入路
６ 逆止弁
７ 下端ノズル
１１ 閉止弁座
１２ 閉止駒
１３ 高圧噴射ノズル
１７ 噴出口
１８ 連通路
１９ 攪拌翼 DESCRIPTION OF SYMBOLS 1 Main body rod 2 High pressure injection liquid 3 Injection path 6 Check valve 7 Lower end nozzle 11 Stop valve seat 12 Closing piece 13 High pressure injection nozzle 17 Outlet 18 Communication path 19 Stirring blade

Claims (4)

高圧注入液の注入路を軸方向に設けて本体ロッドを形成し、この本体ロッドの下端に、高圧注入液の噴射方向にのみ開弁する逆止弁を介して高圧注入液の下端ノズルを形成するとともに逆止弁の高圧注入液側に、閉止駒の投入により下端ノズル方向への高圧注入液の噴出を遮断する閉止弁座を形成し、この閉止弁座の高圧注入液の注入側で注入路の両側に、高圧注入液の高圧噴射ノズルを注入路の軸方向に対して直角且つ同軸上に一対形成した事を特徴とする地中杭の形成装置。   A main body rod is formed by providing an injection path for the high-pressure injection liquid in the axial direction, and a lower-end nozzle for the high-pressure injection liquid is formed at the lower end of the main body rod via a check valve that opens only in the injection direction of the high-pressure injection liquid. At the same time, a closing valve seat is formed on the high-pressure injection liquid side of the check valve to block the injection of the high-pressure injection liquid in the direction of the lower end nozzle by inserting a closing piece. A device for forming underground piles, characterized in that a pair of high-pressure injection nozzles for high-pressure injection liquid is formed at right angles and coaxially with respect to the axial direction of the injection path on both sides. 高圧注入液の注入路を軸方向に設けて本体ロッドを形成し、この本体ロッドの下端に、高圧注入液の噴射方向にのみ開弁する逆止弁を介して高圧注入液の下端ノズルを形成するとともに逆止弁の高圧注入液側に、閉止駒の投入により下端ノズル方向への高圧注入液の噴出を遮断する閉止弁座を形成し、この閉止弁座の高圧注入液の注入側で注入路の両側に、高圧注入液の噴出口を注入路の軸方向に対して直角且つ同軸上に一対形成するとともにこの噴出口に連通する連通路を、本体ロッドの両側に突出した攪拌翼内の軸方向に一対形成し、この連通路の先端を高圧注入液の高圧噴射ノズルとした事を特徴とする地中杭の形成装置。   A main body rod is formed by providing an injection path for the high-pressure injection liquid in the axial direction, and a lower-end nozzle for the high-pressure injection liquid is formed at the lower end of the main body rod via a check valve that opens only in the injection direction of the high-pressure injection liquid. At the same time, a closing valve seat is formed on the high-pressure injection liquid side of the check valve to block the injection of the high-pressure injection liquid in the direction of the lower end nozzle by inserting a closing piece. A pair of high-pressure injection liquid jets formed at right angles and coaxially with respect to the axial direction of the injection path on both sides of the nozzle, and a communication passage communicating with the jet outlet is formed in the shaft in the stirring blade projecting on both sides of the main body rod An underground pile forming apparatus, characterized in that a pair is formed in a direction, and the tip of the communication passage is used as a high-pressure injection nozzle for high-pressure injection. 高圧注入液は、セメントミルクである事を特徴とする請求項１または２の地中杭の形成装置。   3. The underground pile forming apparatus according to claim 1 or 2, wherein the high-pressure injection liquid is cement milk. 高圧注入液は、水である事を特徴とする請求項１または２の地中杭の形成装置。   3. The underground pile forming apparatus according to claim 1 or 2, wherein the high-pressure injection liquid is water.
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JP2017031735A (en) * 2015-08-05 2017-02-09 株式会社エステック Ground hardening layer establishment method and device thereof
JP2019027238A (en) * 2017-08-03 2019-02-21 株式会社不動テトラ High-pressure injection device
KR102197924B1 (en) * 2020-06-02 2021-01-04 박성진 A System for Reinforcing Foundation with Imoroved Permeating Ability of Reinforcing Materials

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