JPH0813469A - Ground injection device for foaming resin solution - Google Patents

Abstract

PURPOSE:To rapidly and efficiently carry out an injection work, by providing a constriction to an injection hose at the mouth to mix and inject a foaming resin solution and cutting off the injection of resin solution. CONSTITUTION:When a rockbolt or the like is inserted in the ground and rigid foaming urethane or the like is infected to improve the ground, the foaming resin is poured to the mouth opening of the bored hole 1 through an injection hose 4 at the opening made of polyethylene tube, provided with a mixing blade 8 at the inside face, and the opening is closed. The hose 4 is provided with constrictions 6, 7 at both sides of mixing part. When the closing work is suspended due to shifting or the like, the constrictions 6, 7 are bent to cut off the resin solution. Or the constrictions are pinched by a ring. After the mouth opening has been sealed, a foaming resin is injected through a hollow rod 2 to fix the rod. In this way, the opening and closing works of the mouth opening can be efficiently done.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a submerged injection device for a liquid agent for improving the solidification of the ground by injecting a foamable resin type liquid agent such as a hard urethane foam resin into the ground such as a ground. .

[0002]

2. Description of the Related Art Conventionally, as a means for stabilizing the ground such as tunnels and slopes, a hollow rock bolt is inserted into a hole formed in the ground, and a liquid urethane foam is inserted through the hollow portion of the rock bolt. A technique is known in which a main component of resin, a curing agent, and the like are injected into the ground and foamed and cured in the ground to improve the fixing action as a rock bolt and the solidification of the ground. By the way, in this conventional technique, regardless of whether the perforation is in the upward state or the downward state, the pressure is released in order to effectively promote the permeation action into the cracks and the like of the liquid agent accompanying the foaming reaction in the ground. After closing the gap between the outer peripheral surface of the lock bolt and the mouth portion of the hole to prevent the perforation, the main injection work of the liquid agent is performed. For this reason, by mixing the urethane main agent for caulking and the curing agent and immersing the waste cloth in the gap portion and foaming and curing it, the mouth portion is closed, or the bag in which the lock bolt itself has an injection port in advance. A conventional method has been to attach a pucker-shaped packer and inject it by mixing and injecting a caulking urethane main agent and a curing agent into the bag-shaped pucker through the filling port to expand the bag-shaped pucker and block the mouth part. Was taken from.

[0003]

However, the above-mentioned conventional technique for closing the gap at the mouth portion of the perforation is the former method of using a waste cloth soaked with the liquid agent, and the liquid agent soaked in the waste material at the time of work is used. However, the workability is not good, such as easily adhering to the worker's hand or work clothes, and in addition, the liquid agent is likely to drip particularly in the mouth closing work for the upward drilling, so that the construction itself is difficult. Further, in the latter method of using the bag-shaped packer, not only the bag-shaped packer itself is expensive, but also the flexibility with the perforated state is limited, and it is difficult to apply to the self-piercing type rock bolt. There was a problem such as. The present invention has been made in view of such conventional technical circumstances, and the purpose thereof is as follows. (1) The workability regarding the work of closing the gap at the mouth of the hole is improved. (2) The hardening of the liquid agent on the liquid agent supply side due to a waiting time or the like in the liquid agent injection work is reduced to reduce the trouble in reuse. (3) Improving the sealing work of the mouth injection hose itself for supplying the liquid agent to the mouth portion.

[0004]

According to the present invention, prior to the main injection of a liquid agent into a hole by a hollow rod, a foamable resin-based liquid agent is supplied to the mouth portion of the hole through the mouth injection hose. In an underground pouring device for a foamable resin-based liquid agent that closes the mouth portion by foaming and hardening, a front and rear constricted portion is formed in the middle of the mouth pouring hose, and a mixing means is provided in the middle portion of the front and rear constricted portion. It is characterized by having done. Further, the present invention is characterized in that a ring-shaped shape-retaining tool is attached to the constricted portion at the rear portion.

[0005]

According to the present invention, since the mixing means of the liquid agent is installed inside the mouth injection hose side, the liquid agent in the equipment on the liquid agent supply side is not mixed in the mouth closing work. Therefore, after the liquid agent is injected through the mouth injection hose, Even if there is a waiting time during work, the liquid agent such as the Y-shaped tube is hardened very little, and the trouble in its reuse is greatly reduced. Further, when the mouth injection hose is sealed, it can be performed by bending it from the constricted portion, so that the work is easy and a reliable sealed state is easily obtained. Further, since the ring-shaped shape-retaining device attached to the constricted portion at the rear portion prevents the constricted portion from being deformed due to the injection pressure at the time of injecting the liquid agent, the withdrawal of the mixing means is prevented.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a liquid agent injecting operation in the underground injecting device according to an operation procedure. In the figure,
Reference numeral 1 denotes a perforation formed in the ground, which is shown in the case of the mouth portion A being slightly lower than in the upward state, but it is needless to say that it can be applied to the downward state. 2 is the hole 1 at the axial center
It is a hollow rod in which a supply passage 3 for injecting a foamable resin liquid agent is formed. In the case of the present embodiment, spiral irregularities are formed on the entire length of the outer surface of the hollow rod 2. However, it is possible to change the shape of the irregularities or omit the irregularities in the intermediate portion. Is.

In the figure, 4 is a mouth injection hose made of polyethylene pipe or the like, which is inserted through a gap between the hollow portion 2 of the mouth portion A of the hole 1. The remaining gap portion of the mouth portion A is temporarily closed by a filling material 5 such as a dry waste cloth so that the mixed liquid of the foamable resin-based liquid agent injected from the mouth injection hose 4 is accumulated. When the perforation 1 is in the downward state, the mouth of the mouth injection hose 4 is positioned so as to open in the middle portion of the filling material 5 such as a waste cloth, and the mixed liquid of the foamable resin-based liquid agent is filled inside the filling material 5. To spill into. Then, when the mixed liquid of the foamable resin-based liquid agent foams and hardens, the mouth portion A of the perforation 1 is surely closed. By the way, as shown in FIG. 5, the mouth injection hose 4 is formed with constricted portions 6 and 7 at front and rear, by crushing the middle of the hose to an extent that does not hinder the flow of the liquid agent. Further, at the time of molding, an appropriate mixing means 8 is installed in an intermediate portion of the constricted portions 6 and 7 so that the liquid agent can be mixed on the mouth injection hose 4 side. Therefore, in the occlusion injection work from the mouth injection hose 4, since the liquid agent in the liquid agent supply side device such as the Y-shaped tube is not mixed, the curing reaction is significantly reduced, and it is extremely effective in reusing the device. Further, as a result of the curing of the liquid agent in the liquid agent supply side device being reduced as described above, the curing speed of the liquid agent for occlusion is adjusted to be faster than that of the liquid agent for main injection by the hollow rod 2. As a result, it is possible to improve the workability of closing the mouth portion A. The mixing means 8 uses a spiral guide blade,
An appropriate static mixer, such as one provided with a plurality of stirring blades along the central axis, is used. In addition, a ring-shaped shape retainer 9 is attached to the constricted portion 7 at the rear portion, and deformation due to the injection pressure at the time of injecting the liquid agent is prevented, so that withdrawal by the injection pressure of the mixing means 8 is avoided.
The ring-shaped shape retainer 9 may have any number of turns, a cross-sectional shape, a material, etc. as long as it can prevent the constricted portion from being enlarged and deformed due to the injection pressure. Furthermore, the constricted part 6 on the front part
Also, a similar shape retainer may be attached.

Further, in the figure, 10 is a Y-shaped tube which constitutes the end of the device for supplying the liquid agent, and two fork portions 11 and 12 on the inflow side are provided with two liquid agent supply sources not shown, that is, for example, urethane. The supply source of the main agent a and the supply source of the curing agent b are connected. The tube portion 13 on the outflow side of the Y-shaped tube 10 is formed to have an outer diameter that can be fitted into the mouth injection hose 4.
By the fitting, the mouth injection hose 4 can be connected to the liquid agent supply side. At the time of connection, if necessary, it is tightened and fixed from the outside of the mouth injection hose 4 with an appropriate tightening band or the like. Further, as shown in FIG. 6, a male screw portion 14 is provided on the outer peripheral surface of the cylindrical portion 13 of the Y-shaped tube 10.
Is formed, and the female screw portion 16 formed on one side of the connector 15 used for connection at the time of main injection from the hollow rod 2 described later can be screwed. Further, on the other side of the connecting tool 15, a female screw portion 17 that can be screwed into a screw portion on the outer peripheral surface of the hollow rod 2 is formed, and the Y-shaped tube 10 and the hollow rod are connected through these screw connections. It is configured to be able to connect with 2. In FIG. 6, 1
Reference numeral 8 denotes a nozzle portion that is added when connecting the Y-shaped tube 10 and the hollow rod 2 and injecting a liquid agent into the perforation 1. Inside the nozzle portion 18, mixing means 19 for mixing the liquid agent is installed. ing. Reference numeral 20 denotes a locking jaw formed at the end of the nozzle portion 18.

However, in the work of injecting the liquid agent,
First, as shown in FIG. 1, a hollow rod 2 is inserted into each perforation 1, and the mouth injection hose 4 is set between the hollow rod 2 of the mouth portion A of the perforation 1 and the waste space is left in the gap. It is temporarily closed by the padding 5 such as. Thereafter, as shown in FIG. 2, the tube portion 13 of the Y-shaped tube 10 is fitted into the mouth injection hose 4 to inject the liquid agents a and b from the respective liquid agent supply sources (not shown). When injecting these liquid agents a and b,
Both liquids a and b are mixed well when passing through the mixing means 8 installed in the mouth injection hose 4, and are supplied to the filling 5 portion in a state capable of foaming and curing reaction, and the gap portion of the mouth portion A is Securely block.

Thereafter, the tube portion 13 of the Y-shaped tube 10 is pulled out from the mouth injection hose 4, and the operation for sealing the mouth injection hose 4 shown in FIG. 3 is started. The sealing operation of the mouth injection hose 4 is performed by bending the mouth injection hose 4 itself from the constricted portion 6 or 7 formed on the mouth injection hose 4. The bending work from the constricted portion 6 or 7 is extremely easy, and a reliable sealing action can be easily obtained. After the bending, as shown in the figure, the bent portions are tightly bound by an appropriate binding tool 21.

When all the mouth injection hoses 4 have been sealed, the main injection work from the hollow rod 2 shown in FIG. 4 is started. In this main injection work,
First, the male screw portion 1 formed on the cylindrical portion 13 of the Y-shaped tube 10
The female screw portion 16 of the connector 15 is screwed onto the connector 4, and is screwed all the way in. Then, the nozzle portion 18 is inserted into the base end portion of the hollow rod 2, and in that state, the female screw portion 17 of the connector 15 is screwed into the screw portion of the outer periphery of the base end portion of the hollow rod 2 and fixed by tightening. By doing so, the Y-shaped tube 10 on the liquid agent supply side
And the hollow rod 2 are connected. After that, the liquid agents a and b are injected into the perforations 1 through the Y-shaped tube 10 and the supply path 3 of the hollow rod 2 by a pressure pump or the like (not shown). When the liquid agents a and b are injected, they are well mixed when they pass through the mixing means 19 of the nozzle portion 18, and are injected into the perforations 1 in a state capable of foaming and curing reaction. In this case, since the curing speed of the mixed liquid agent is set to be moderately slow by the mixing of the liquid agents a and b, the injected mixed liquid agent has the holes 1,
It can flow into every corner of the space surrounded by the hollow rod 2 and the mouth closing part. In this way, the hollow rod 2
When the main injection by the above is completed, the connecting tool 15 is removed from the hollow rod 2, the nozzle portion 18 is pulled out, the upper end opening of the hollow rod 2 is capped, and the liquid agent for each hole 1 is ground. Medium injection work is completed. In addition,
In this work, the hollow rod 2 for the uninjected perforation 1
In the case of adopting a work procedure in which the main injection work from 1) is sequentially and continuously performed, if the hardening speed of the mixed liquid agent in the main injection is set to be appropriately slow as described above, It is possible to continue the work while sequentially reusing the nozzle portion 18 for the next main injection by utilizing the time margin until the mixed liquid agent is cured.

[0012]

According to the present invention, the following effects can be obtained. (1) Since the work of closing the mouth of the perforation is performed by injecting the foaming liquid agent using the mouth injecting hose, it is almost eliminated that the liquid agent adheres to the hand or work clothes as in the conventional case.
Since the mixing means of the liquid agent is arranged on the mouth injection hose side, the hardening phenomenon of the liquid agent in the liquid agent supply side device such as the Y-shaped tube during the mouth closing work is significantly reduced, and the obstacle for its reuse is reduced. As a result, the workability of the mouth closing work is significantly improved. (2) As a result of the hardening phenomenon in the liquid agent supply side device such as the Y-shaped tube in the mouth closing work being reduced, the hardening speed of the injected liquid agent used in the mouth closing work can be increased and the workability thereof can be improved. It is possible. (3) Since the mouth injection hose can be sealed by bending it from the constricted portion of the mouth injection hose, it is easy to bend and a reliable sealed state can be easily obtained. (4) Since the ring-shaped shape retainer is attached to the constricted portion at the rear part formed in the mouth of the mouth injection hose, the mixing means is reliably prevented from being pulled out by the injection pressure when the liquid agent is injected.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view showing a working state of an embodiment of the present invention.

FIG. 2 is a sectional explanatory view showing a working state of the same embodiment.

FIG. 3 is a cross-sectional explanatory view showing a working state of the embodiment.

FIG. 4 is a cross-sectional explanatory view showing a working state of the embodiment.

FIG. 5 is a cross-sectional view of the mouth injection hose in the same example.

FIG. 6 is an enlarged exploded view of a Y-shaped tube portion in the embodiment.

[Explanation of symbols]

1 ... Perforation, 2 ... Hollow rod, 3 ... Supply path, 4 ... Mouth injection hose, 5 ... Filling material, 6, 7 ... Constricted portion, 8 ... Mixing means,
9 ... Shape-retaining tool, 10 ... Y-tube, 15 ... Connection tool, 18 ...
Nozzle part, 19 ... Mixing means, 21 ... Binding tool

Claims (2)

[Claims] 1. A hollow rod, which is inserted into a hole formed in the ground and has a supply path for injecting a foaming resin-based liquid agent into the hole at the axial center thereof, and a foamable material at the mouth of the hole. A mouth injection hose for supplying a resin-based liquid agent is provided, and prior to the main injection of the liquid agent into the hole by the hollow rod, the foamable resin-based liquid agent is supplied to the mouth portion of the hole through the mouth-injection hose. In the underground injection device for a foamable resin-based liquid agent that closes the mouth part by forming a constricted part in the front and rear in the middle of the mouth injection hose, and mixing means is installed in the middle part of the front and rear constricted part. Underground injection equipment for characteristic foamable resin liquids. 2. The underground injection device for a foamable resin-based liquid agent according to claim 1, wherein a ring-shaped shape retainer is attached to a constricted portion at a rear portion formed in the mouth injection hose.