JP2001323450A - Construction method of injecting chemical solution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of injecting a chemical solution, enabling a cover lock for the bottom face of a water-impermeable wall to be rendered fully water-impermeable. SOLUTION: In the construction method of injecting a chemical solution, the ground G is drilled horizontally by use of a flexible pipe 12 having a chemical solution injection monitor 10 at its front end, and the chemical solution J is injected from the chemical solution injection monitor 10. An improved ground area 14 in the form of a horizontally extending flat plate is constructed and the chemical solution J is injected into an area 2 below the horizontally extending improved ground area 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical liquid injection method, and more particularly, to a chemical liquid injection method in which a ground to be improved is excavated in a horizontal direction (or while excavating) and a chemical liquid is injected. About.

[0002]

2. Description of the Related Art A chemical liquid injection method for permeating or injecting a chemical liquid made of cement milk or other consolidating material into fragile ground to improve a region into which the chemical liquid has been injected into solid soil has been widely used. Have been. In particular, in recent years, a technique has been proposed that can perform a ground improvement by injecting a chemical solution into a specific area in the ground below the existing building without breaking down the existing building.

One example of such a technique is shown in FIG. FIG. 20 shows an application of a technique called “bent boring”, in which a ground G is excavated in a curved shape by a flexible tube 12 having an excavating head 10 at the tip, and reaches an area 2 to be improved. Here, a chemical solution is injected from the head 10 into the region 2. At this time, since bending boring is being performed from a location distant from the existing building 1, FIG.
If the conventional technology shown by (1) is used, there is no need to demolish the building 1.

[0004] However, a chemical solution sprayed from a monitor or the like has a property of penetrating into soil and then traveling toward the ground. Therefore, as shown in FIG. 21, most of the chemical J injected into the area 2 to be improved from the head 10 escapes to the ground side, and a sufficient amount of the chemical does not penetrate into the area 2 to be improved. Things will happen. For this reason, there has been a problem that the use amount of the chemical solution increases and the construction cost increases.

[0005]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems of the prior art, and it is possible to reduce the amount of a chemical solution injected into the ground and to reduce the amount of a chemical solution over a predetermined area with a small amount of a chemical solution. The purpose is to provide a chemical solution injection method that can penetrate the chemical solution.

[0006]

According to the chemical solution injection method of the present invention, a ground is excavated in a horizontal direction using a flexible tube (for example, at the tip) having a monitor for chemical solution injection, and the chemical solution is supplied from the monitor for chemical solution injection. In the chemical solution injection method to be injected, a step of creating a flat ground improved region extending in the horizontal direction,
Injecting a chemical solution into a region below the ground improvement region extending in the horizontal direction.

In the practice of the present invention, in order to form the ground-improved region extending in the horizontal direction, a chemical liquid injection method may be used, or the ground-improving material may be sprayed at a relatively high pressure, The so-called “jet grouting method” in which excavation of the ground and mixing of the soil (of the excavated ground) and the ground improvement material may be performed simultaneously.

According to the present invention having such a configuration, first, the ground-improved region extending in the horizontal direction is formed, and then the chemical is injected into a region below the ground-improved region. Even if the injected chemical liquid tries to flow to the ground side, the ground-improved area acts as a so-called cover lock, and blocks the chemical liquid from rising to the ground side. Therefore, the chemical liquid is prevented from leaking or flowing out to the ground side, and the amount of the chemical liquid that is much smaller than the amount of the chemical liquid consumed in the conventional chemical liquid injection method is reduced to a predetermined area (below the ground improved area). The chemical solution penetrates into the area ().

In the present invention, the step of forming the ground-improved region extending in the horizontal direction includes excavating the ground in a horizontal direction using a flexible tube having a chemical liquid injection monitor at a tip thereof, and The flexible tube is moved in the horizontal direction while injecting a chemical solution from the monitor to form a flat plate-shaped chemical liquid injected region in the ground, and a plurality of the plate-shaped chemical liquid injected regions are formed. Are preferably connected to each other.

According to the chemical injection method of the present invention having the above-described structure, a plurality of horizontally-extended liquid-liquid injection regions connected to each other are formed, and the plurality of horizontally-extended liquid injections are formed. Cover lock is constituted by the completed area.
And since the several chemical | medical-solution injection | pouring area | regions extended in the horizontal direction are mutually connected, it fully acts as an impermeable horizontal wall, and a chemical | medical solution is reliably prevented from leaking or flowing out to the ground side. Because

In the practice of the present invention, the formation of the ground-improved region or the region into which the chemical solution has been injected, and the injection of the chemical solution in the step of injecting the chemical solution are performed simultaneously with the excavation of the ground by the distal end portion of the flexible tube. I can do it. In this case, the step of “excavating the ground in a horizontal direction using a flexible tube” and the step of “moving the flexible tube in a horizontal direction while injecting a chemical solution”
Is performed at the same time.

On the other hand, first, the ground is pierced by the distal end of the flexible tube, and after the necessary piercing is completed, when the flexible tube is pulled out to the ground side, a chemical solution is injected from the distal end of the flexible tube. By injecting the flexible tube (to the ground side), it is also possible to inject a chemical solution. In this case, first, the step of “excavating the ground horizontally using a flexible tube” is performed, and after this step, the step of “moving the flexible tube horizontally while injecting a chemical solution” Will be performed.

In practicing the present invention, in order to “connect the chemical-injected regions to each other”, for example, the chemical is injected and injected so that the adjacent chemical-injected regions are inclined in opposite directions to each other. Is preferred. This is because if the liquid medicine is injected and injected such that the adjacent liquid injection areas are inclined in the opposite directions, the injected liquid liquid always reaches the adjacent liquid injection area.

Here, when excavating the ground in the horizontal direction using a flexible tube, a so-called "bent boring" method is adopted, and the excavation is performed so that the flexible tube is substantially horizontal below the contaminated area. Good.

Alternatively, first, a hole in a vertical or oblique direction is excavated, a pipe is inserted into the hole, and a flexible tube called a “kick-off tool” is bent at the end of the pipe.
A member for changing the excavation and traveling direction of the flexible tube is arranged. Then, a flexible tube may be inserted into the pipe, and the excavation and advancing direction of the flexible tube may be changed in the horizontal direction by a “kick-off tool”.

In practicing the present invention, it is preferable to use a so-called "coiled tube" as the flexible tube. However, any pipe that has the strength necessary to carry out the present invention, can transmit the torque required for excavation, and has enough flexibility to be able to bend by a bent boring or kick-off tool. For example, it is not limited to a coiled tube.

Here, a drilling member and a member for injecting a chemical solution are attached to the distal end of the flexible tube. The excavating member may be a rotary excavating bit, an impact-type excavating member such as a down-the-hole hammer, or a water-jet excavator.

Further, when forming a plurality of the plate-shaped regions in which the chemical solution has been injected, the step of forming a single region in which the chemical solution has been injected may be performed a plurality of times. Alternatively, it is also possible to simultaneously form a plurality of the drug solution-injected regions by using a plurality of flexible tubes.

Further, in the chemical liquid injection method according to the present invention, the ground is excavated in the horizontal direction using a flexible tube having a chemical liquid injection monitor at the tip, and the flexible tube is horizontally moved while injecting the liquid chemical from the chemical liquid injection monitor. In the chemical liquid injection method of forming a flat liquid-liquid-injected area in the ground by moving the wing member (wing) provided at the distal end portion of the flexible tube, the soil is removed by the wing member. A step of injecting a chemical solution into the excavated region while excavating to form a plate-shaped region in which the chemical solution has been injected in the ground.

According to this structure, the chemical liquid is always injected into the area excavated by the wing, so that the position of the flat liquid chemical injected area can be accurately predicted and specified.
Then, by accurately predicting and specifying the position of the wing to be formed in advance, it is possible to easily and reliably connect adjacent chemical-injected regions to each other.

In practicing the present invention in which a chemical solution is contained in a region excavated by using a wing, instead of injecting the chemical solution into all of the ground to be improved, a plurality of the plate-shaped chemical solution-injected regions are used. It is preferable to surround the area in the ground to be improved.

If a plurality of the flat plate-like regions filled with the liquid medicine surround a region in the ground to be improved, the region is
It is possible to have the same strength as when a chemical solution is injected into all of the ground to be improved. Therefore, an improved ground having the same strength can be formed with a much smaller consumption of the chemical (compared to the case where the chemical is injected into all the grounds to be improved).

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a chemical solution injection method according to the present invention.

In FIG. 1, below an existing building (for example, a factory) indicated by reference numeral 1, there is an area 2 (in the ground) to be improved by a chemical. An embodiment of forming a cover lock extending horizontally above the area 2 is shown in FIGS.

At the time of forming the cover lock, first, as shown in FIG. 2, a flexible tube 12 provided with a head 10 for excavation and injection of a chemical solution at its tip is formed by a known method called "bent boring". Excavation and advance to a range sufficient to cover the area above Here, in the case of the curved boring, the excavation and the traveling direction are performed above the area 2 so as to be substantially horizontal. In other words, the bending boring is performed at least until the head 10 reaches a position beyond the contaminated area 2 (the state shown in FIG. 2). Then, when the state shown in FIG. 2 is reached, as shown in FIG. 3, the injection of the chemical solution is started.

In FIG. 3, the flexible tube 12 and the head 10 are pulled out as shown by an arrow P while a chemical solution (indicated by the symbol J) is injected and injected from the head 10. As a result, as shown by reference numeral 14 in FIG. 3, an elongated chemical liquid injected region 14 (a flat ground-improved region) is formed along the drawing direction of the flexible tube 12 and the head 10.

In the following, the construction described with reference to FIGS. 2 and 3 is performed a plurality of times in the direction perpendicular to the paper of FIGS. 2 and 3 to form a cover lock. Here, a plurality of regions 1 in which the chemical solution has been injected
4 need to be connected to each other with certainty and the connection points must be sealed. The connection between adjacent chemical solution injected regions 14 will be described later.

If a plurality of chemical-injected areas 14 or cover locks (indicated by reference numeral 14 in FIGS. 4 to 6) can cover the upper part of the area 2 in a direction perpendicular to the paper surface of FIG. As shown in FIG. 4, the area 2 where the ground is to be improved below the chemical solution injected area 14 is excavated in the horizontal direction by the flexible tube 12 and the head 10 again. And FIG.
As shown in the figure, a chemical solution J for ground improvement is injected from the head 10.

As described above, the chemical solution J tends to rise to the ground side. However, as shown in FIG. 5, the chemical solution J is blocked from rising by the region 14 (or the cover lock). It effectively penetrates into the area 2 (to be improved) below the area 14 without wasteful outflow. And
By injecting the chemical in the same manner as shown in FIGS. 20 and 21, the chemical for soil improvement penetrates the entire area 2 below the area 14 acting as the cover lock, as shown in FIG. Then, the ground improvement is completed.

Next, the construction using the kick-off tool (see FIG. 8) will be described with reference to FIGS.

First, as shown in FIG. 7, a horizontal wall construction device 3 is installed in the vicinity of the area 2, and an excavator 5 provided at a tip of a guide pipe 4 extending from the horizontal wall construction device 3,
The excavation hole 6 is dug diagonally toward the upper part of the area 2 where the ground improvement is to be performed.

As shown in FIG. 8, an excavator 5, a kick-off tool 7, and a sensor 8 are provided at the tip of the guide pipe 4. The excavator 5 is preferably a rotary cutter type excavator having a diameter of about 30 cm, but may be a water jet type excavator.

The kick-off tool 7 has a gentle curved surface and a hole 7a having a diameter of about 3 cm for smoothly guiding a flexible tube described later. The sensor 8 detects the depth of the oblique hole 6 and the direction of the hole 7a of the kick-off tool 7, and accurately digs a horizontal hole (excavated in a horizontal hole digging step described later) above the area 2. It is to make.

Next, as shown in FIG. 9, a flexible tube 12 provided with a sensor and a head 10 for excavation and injection of a chemical solution is provided.
Into the guide pipe 4. And the flexible tube 1
2 is extracted from the hole 7 a of the kick-off tool 7, and a horizontal hole 13 is excavated to a position above the contaminated area 2.

When the horizontal hole 13 is excavated, FIG.
As shown in FIG. 2, when the flexible tube 12 is pulled out while ejecting the chemical from the head 10, the chemical solution-injected region 14 (a flat ground improvement) acting as a cover lock is formed in the same manner as in FIGS. Area) is created. Otherwise, the same construction as in FIGS. 2 to 6 is performed.

As shown in FIG. 11 and FIG.
The head 10 provided at the distal end is provided with upward and downward injection ports 10a so that the liquid medicine sent from the liquid supply pipe 15 provided in the flexible tube 12 is injected from the injection port 10a. Has become. Here, the sensor 11 detects the direction of the injection port 10a, and the sensor liquid injection region 14 can be formed with an accurate inclination by the sensor 11. As the chemical liquid to be injected, cement milk, mortar, and other chemical liquids are appropriately selected in accordance with the area 2 in which the ground is to be improved.

As shown in FIG. 13, when forming the chemical-injected region 14, the chemical-injected region 14 is formed so as to have an inclination opposite to that of the previously formed chemical-injected region 14 A.
Form B. In this way, the adjacent liquid-injected regions 14
By forming A and 14B in reverse inclination, the edges are connected to each other even if the formed liquid-injected regions 14A and 14B are thin. As a result, in FIG.
The cover lock indicated by has a completely impervious structure,
It is possible to completely block the ground improvement chemical from rising to the ground side.

In forming the above-described chemical liquid injected region 14 acting as a cover lock, an upward and downward injection port 10a is provided in the chemical injection head 10, and the chemical liquid is injected from the injection port 10a to obtain a cross section I. A region 14 in which a chemical solution has been injected is formed. However, as shown in FIG. 14, both the injection ports 10 a may be provided upward to form the region 14 having the V-shaped cross section.

As shown in FIGS. 15 and 16, an I-shaped wing 19 (wing member) may be provided at the tip of the flexible tube 12. When such a wing 19 is provided, the flexible tube 1 is ejected from the ejection port 10a of the head 10 while the liquid medicine is ejected.
When the wing 19 is pulled out, the wing 19 is expanded, the ground is cut or excavated with the wing 19, and a chemical solution is injected into the cut (or excavated) area, and the cut area (excavated area) is obtained. Is reliably injected with a chemical solution.

Here, the head 10 moves forward (excavation / progress).
When the wing 19 is folded, the wing 19 is folded like a chain line, and when the wing 19 is retracted (pulled out), the wing 19 is opened as shown by a solid line.

As shown in FIG. 17, the injection port 10a may be provided in the wing 19. Also, as shown in FIG.
The wing 19 may be provided in a V shape.

At the time of injecting the chemical into the area where the ground improvement is to be performed, a plurality of flat plates are used instead of injecting and penetrating the chemical throughout the entire area indicated by reference numeral 2-P in FIG. Chemical solution injected areas 14-U, 14-L, 14-
B, 14-R surround the area 2-P, and the central area 1
It is also possible not to inject a chemical solution into 4-C.

The peripheral portion of the area 2-P to be ground-improved is defined as a region in which the chemical solution has been injected (or a ground-improved region) 14-.
U, 14-L, 14-B, 14-R,
It is possible to obtain the same level of strength as injecting and penetrating the chemical solution into the entire region 2-P. In addition, compared with the case where the chemical is injected into the entire region 2-P, the amount of the ground improvement chemical that is consumed is significantly reduced, and a significant reduction in construction cost can be achieved.

Here, the chemical solution injected regions 14-U, 14-
The formation of L, 14-B, and 14-R is the same as that described with reference to FIGS.

It should be noted that the present invention is not limited to the contents shown in the drawings, and that various modifications and changes are possible. For example, when the ground-improved region 14 extending in the horizontal direction is formed, the plate-shaped region 14 is formed by the chemical liquid injection method in FIGS. 2 and 3.
Excavation of the ground by the jet of ground improvement material (jet),
The ground and the improvement material may be mixed to form the flat ground-improved region 14.

[0046]

As described above, according to the present invention, by constructing a cover lock having a completely water-impermeable structure,
It is possible to reduce the amount of ground improvement chemical solution consumed during the construction of the chemical solution injection method and to reduce the construction cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing land on which a chemical solution injection method according to the present invention is performed.

FIG. 2 is a diagram showing a horizontal excavation step in one embodiment of the present invention.

FIG. 3 is a view showing a ground-improved area construction step in the embodiment of FIG. 2;

FIG. 4 is a view showing one step of injecting a chemical solution after creating a ground-improved region.

FIG. 5 is a view showing another process different from that in FIG. 4 after creation of the ground-improved region.

FIG. 6 is a view showing another process different from FIGS. 4 and 5 after the ground-improved region is created.

FIG. 7 is a diagram illustrating an oblique hole excavation step in another embodiment of the present invention.

8 is a side view showing a cross section of a distal end portion of a guide pipe used in the embodiment of FIG. 7;

FIG. 9 is a view for explaining a horizontal hole excavation step in the embodiment of FIGS. 7 and 8;

FIG. 10 is a view for explaining a step of constructing a region into which a drug solution has been injected in the embodiment of FIGS.

FIG. 11 is a side view showing a cross section of a distal end portion of the flexible tube.

FIG. 12 is a front view showing a cross section of a distal end portion of the flexible tube.

FIG. 13 is a diagram illustrating the construction of a cover lock.

FIG. 14 is a front view showing a cross section of a distal end portion of a flexible tube according to another embodiment.

FIG. 15 is a side view showing a cross section of a distal end portion of a flexible tube according to another embodiment.

FIG. 16 is a front view of a distal end portion of a flexible tube according to another embodiment.

FIG. 17 is a side view of a distal end portion of a flexible tube according to another embodiment.

FIG. 18 is a front view of a distal end portion of a flexible tube according to another embodiment.

FIG. 19 is a front view illustrating still another embodiment.

FIG. 20 is an explanatory view showing a conventional chemical liquid injection method using curved boring.

FIG. 21 is an explanatory view showing the problem of the conventional technique shown in FIG. 20;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Factory 2 ... Land (area) 3 ... Cover lock construction apparatus 4 ... Guide pipe 5 ... Excavator 6 ... Diagonal hole 7 ... Kick-off tool 7a ... Holes 8, 11 ... Sensor 10 ... Head for excavation and chemical injection 10a ... Injection port 12 ... Flexible tube 13 ... Horizontal hole 14 ... Ground improved area (or chemical injection) 15) Liquid feed pipe 16 ... Cover lock 17 ... Vertical wall construction device 18 ... Vertical wall 19 ... Wing

Continued on the front page (72) Inventor Takahiko Mihara 1-6-4 Moto-Akasaka, Minato-ku, Tokyo F-term (reference) in Chemica Lugrout Co., Ltd. 2D040 AB01 AB03 BB03 BC01 BC04 BD03 CA01 CB03 DA00 DA05 DA11 DA13 FA01

Claims (4)

[Claims] In a chemical liquid injection method in which a ground is excavated in a horizontal direction using a flexible tube having a liquid injection monitor and a liquid is injected from the liquid injection monitor, a flat ground extending in a horizontal direction is provided. A chemical solution injection method, comprising: a step of forming an improved region; and a step of injecting a chemical solution into a region below the ground improved region extending in the horizontal direction. 2. The step of forming the ground-improved region extending in the horizontal direction includes excavating the ground in a horizontal direction using a flexible tube having a monitor for injecting a chemical solution at a tip thereof, and By moving the flexible tube in the horizontal direction while injecting the chemical, a flat liquid-filled region is formed in the ground, a plurality of the flat liquid-filled regions are formed, and the liquid-filled regions are connected to each other. 2. The chemical liquid injection method according to claim 1, which is performed continuously. 3. Excavating the ground horizontally using a flexible tube having a chemical liquid injection monitor at the tip, and moving the flexible tube in the horizontal direction while injecting a chemical liquid from the chemical liquid injection monitor, thereby removing the ground into the ground. In the chemical liquid injection method for forming a flat liquid chemical injected region, a step of deploying a wing member provided at a tip portion of the flexible tube, and exposing a chemical liquid to an excavated region while excavating soil by the wing member. Forming a flat plate-like region in which the chemical solution has been injected into the ground by injecting the chemical solution. 4. The chemical injection method according to claim 3, wherein the area in the ground to be improved is surrounded by the plurality of flat liquid injection areas.