KR100731814B1 - Pressured multi-step grouting method and structure thereof - Google Patents

Abstract

A ground reinforcement method by pressured multi-step grouting is provided to grout an insertion hole and the surrounding ground by sealing up an insertion hole with packing members by stages by releasing the elasticity of elastic pieces installed on the outside of a reinforcing pipe. The ground reinforcement method by pressured multi-step grouting comprises the steps of perforating an insertion hole(H) on the ground to insert a reinforcing pipe, inserting a reinforcing pipe(10) attached with many packing members(30) and provided with a through hole(11) to the outer circumferential surface, sealing up the insertion hole with the packing members in multi-step by releasing the elasticity of many elastic pieces(20) installed on the outer circumferential surface of the reinforcing pipe at regular intervals, inserting an injection hose attached with a packer into the reinforcing pipe, and pressurizing and injecting grout materials through the injection hose to be discharged to the through hole of the reinforcing pipe to fill up the injection hole partitioned by many packing members in order and to be permeated to a joint or a fracture zone of the surrounding ground.

Description

PRESSURED MULTI-STEP GROUTING METHOD AND STRUCTURE THEREOF}

1 is a process chart of the pressure multi-stage grouting ground reinforcing method according to the present invention,

2 (a) to 2 (f) is a view showing a construction sequence for explaining the ground reinforcing method according to the present invention,

3 and 4 are cross-sectional views before and after construction of the ground reinforcement structure according to the present invention.

Explanation of symbols on the main parts of the drawings

10: reinforcing pipe 20: elastic piece, preferably rim spring

30: packing member 31: expandable foaming agent

50: packer 60: injection hose

The present invention relates to a pressure multi-stage grouting ground reinforcing method and its structure, and more particularly, the packing member is firmly packed into the insertion hole by the elastic release of the elastic piece provided at a predetermined interval on the outer periphery of the reinforcing pipe, the insertion hole and the surrounding ground It relates to a pressure multi-stage grouting ground reinforcing method and its structure that can grout step by step.

The ground created by road construction, railway construction, tunnel construction, or earth excavation works is rain or snow melted, and the strength of the ground decreases and weathering progresses, resulting in local slope collapse and falling rocks. Since damage can occur, the ground is reinforced to prevent ground collapse.

As an example of such a ground reinforcing method, conventionally, a reinforcing material is inserted into an insertion hole drilled in the ground, and a sealant in a gel state mixed with cement and bentonite is filled between the reinforcing material and the insertion hole, After caulking, insert the injection hose equipped with the packer deeply into the reinforcement and insert the cement milk into the injection hose, and the cement milk fills the insertion hole. After that, repeating the cement milk injection while reversing the packer step by step, the grouting is completed for the entire insertion hole to reinforce the ground. In this case, the sealant serves to countercurrently prevent the flow of cement so that the cement milk is gradually filled between the reinforcing material and the insertion hole.

However, the conventional ground reinforcement method has a problem in that the construction time takes a long time since the grouting should be performed after the sealant is cured, and especially in the case of tunnel construction, the tunnel excavation and the cycle do not fit, and the sealant Even if the hardening of the grouting by performing the construction is a problem that often occurs. In addition, due to the limited compressive strength of the seal agent, when the grouting injection pressure is high, the seal agent is destroyed, and thus, the purpose of the seal agent, which is initially to countercurrent discharge zone, cannot be achieved. In addition, the spacer should be installed in order to place the steel pipe in the center of the insertion hole, but since the spacer should be made smaller than the insertion hole, the stress distribution is evenly distributed as the steel pipe pipe is not positioned at the center of the insertion hole and is biased downward. There was a problem that can not be achieved precise construction.

To solve this problem, Korean Patent Application Publication No. 2005-40079 discloses a ground reinforcing method that can grout step by step without the process of filling a sealant. The method introduces a method of partitioning the packing member into the reinforcing member and injecting the packer material into the packing member to seal the insertion hole into a plurality of sections, and then grouting the plurality of sections of the insertion hole sequentially or simultaneously. Since the packing member seals the insertion hole only after injecting packer material such as cement admixture into each packing member, it takes a lot of time in the packing material injection process, and when the packer material is insufficiently injected, the insertion hole is completely sealed. If you can not achieve the purpose, and the packer material is excessively injected, there is a problem that the packer bag is broken and also can not achieve the purpose.

In addition, the technique is incurred additional costs due to the installation of a plurality of injection pipes because each injection pipe is installed in each section, so the narrower the packer interval, the higher the number of grouting stages, but the packer due to the increased injection pipe installation cost It is difficult to narrow the gap, so that the grouting stage cannot be increased, and this causes a problem that the efficiency of the long reinforcement section is particularly low in long construction work. In addition, since a plurality of injection pipes are disposed in the section close to the insertion hole inlet, the area occupied by the injection pipes is widened, so that the grout spheres are reduced by the volume of the injection pipes, thereby reducing the reinforcement force.

In addition, since the packer material is injected into the packer bag, the technique blocks the empty wall after the packer bag spreads to the side, so that the contact portion between the packer bag and the empty wall does not penetrate the grout agent, thereby reducing the ground reinforcing effect.

The present invention has been made to solve the above problems, an object of the present invention is to ensure the multi-stage sealing of the insertion hole by the pressure multi-stage grouting after the packing member is packed in multiple stages by the elastic release of the elastic piece Since it is not necessary to inject the packer, it is possible to save construction time and to provide a multi-stage grouting ground reinforcement method and a structure that can fundamentally solve the problems caused by the packer material injection failure.

The object of the present invention is the step of drilling the insertion hole in the ground; Inserting a plurality of packing members for sealing the insertion holes in multiple stages at a predetermined interval by the elastic release of the elastic pieces on the outer circumference thereof and inserting reinforcement pipes having through holes into the insertion holes; Releasing the elasticity of the elastic piece to seal the insertion hole in multiple stages by elastic pressure; Inserting a packer-mounted injection hose into the reinforcement pipe; It can be achieved by providing a pressure multi-stage grouting ground reinforcing method characterized in that it comprises a step of sequentially grouting the insertion hole partitioned by a plurality of packing members by reversing the injection hose step by step.

In addition, the object of the present invention is inserted into the perforated insertion hole, the outer periphery of the reinforcing pipe is formed with a plurality of packing members fixed at regular intervals to seal the insertion hole in multiple stages by the elastic release of the elastic piece; The packer is mounted on the front side, and includes an injection hose that is stepped backward in the reinforcement pipe while repeating the expansion and contraction of the packer, and the insertion hole in which the grout injected through the injection hose is partitioned by the packing member is sequentially formed. It can be achieved by providing a pressure multi-stage grouting ground reinforcement structure characterized in that the grouting.

The object of the present invention described above will become more apparent from the preferred embodiment of the present invention described below with reference to the accompanying drawings.

Hereinafter, with reference to the accompanying drawings will be described in the pressure multi-stage grouting ground reinforcing method and its structure.

1 is a process diagram of the ground reinforcement method according to the present invention, Figure 2 (a) to Figure 2 (f) is a view showing the construction sequence for explaining the ground reinforcement method according to the present invention, Figure 3 and Figure 4 is a cross-sectional view before and after construction of the ground reinforcement structure according to the present invention.

Ground reinforcement method according to the invention first drills the insertion hole (H) that can be inserted into the ground reinforcement pipe 10 as shown in Figure 2 (a).

Thereafter, the plurality of packing members 30 sealing the insertion hole H in multiple stages in the perforated insertion hole H by the elastic release of the elastic piece 20 on the outer circumference, as shown in FIG. ) Is fixedly installed at regular intervals and inserts the reinforcement pipe 10 in which the through holes 11 are formed.

Referring to Figures 3 and 4 with respect to the reinforcing pipe 10, the packing member 30 is fixedly installed, a plurality of elastic pieces 20 are installed on the outer periphery of the reinforcing pipe 10 at regular intervals. It is. The elastic piece 20 is preferably wound around the outer periphery of the reinforcement pipe 10 with a rim spring. The lateral spring 20 is tied to penetrate the inside of the reinforcing pipe 10 as shown in FIG. Outside the rim spring 20, the packing member 30 is bent at both ends of the reinforcing pipe 10 is disposed. The packing member 30 may be a single member, but is preferably a double member for robustness. Here, in the case of the double member, it is preferable that an expandable foaming agent 31 such as a urethane capsule foamed by impact is foamed therein. In addition, the packing member 30 is preferably a reinforcing fabric having a predetermined elasticity.

On the other hand, the reinforcement pipe 10 may be a steel pipe according to the construction characteristics may be a menjet tube. That is, in the case of tunnel construction, a steel pipe may be used to increase reinforcement in the insertion hole drilled in the upper part of the tunnel, and in the case of earth excavation construction, the men's tube may be used for ground reinforcement or order.

The present invention then includes the step of releasing the elasticity of the elastic piece 20 as shown in Figure 2 (c) to seal the insertion member 30 in multiple stages by the elastic pressure. That is, when the cutting pipe 40 is inserted into the reinforcing pipe 10 to cut the string 21, the lateral spring 20 in the contracted state is expanded and the packing member 30 disposed outside thereof is inserted into the insertion hole ( H) It adheres to the inner wall. At this time, the urethane capsule 31, which is an expandable foaming agent contained in the packing member 30, bursts and foams inside the packing member 30 to form a packing wall. Then, the insertion hole (H) forms a space divided into a plurality by the plurality of packing members (30).

 Thereafter, as shown in FIG. 2 (d), an injection hose 60 equipped with a packer 50 is inserted into the reinforcement pipe 10. The packer 50 is a known rubber packer or hydropacker, and a supply pipe 51 and an exhaust pipe 52 are introduced. Therefore, when air is injected through the supply pipe 51, the air expands to seal the reinforcement pipe 10, thereby preventing the grout agent (cement milk or chemical grout agent) from flowing back into the reinforcement pipe 10 and of course the grout agent on the ground. Infiltration is injected, and when it is reversed, when the air is discharged through the exhaust pipe 52, it is contracted and movable.

Then, as shown in Figures 2 (e) and 2 (f) when the injection hose is sequentially reversed when the grout agent is injected under pressure through the injection hose 60, the grout agent is formed in the reinforcing pipe 10 It is discharged to the through-hole 11 is filled with the insertion hole (H) partitioned by the plurality of packing members 30 in sequence and at the same time infiltrated and injected into the joint or crushing zone of the surrounding ground. Thus, the construction of the pressure multi-stage grouting ground reinforcing method according to the invention is completed.

As described above, in the pressure multi-stage grouting ground reinforcing method according to the present invention, since the packing member 30 grits sequentially after the packing member 30 is inserted in multiple stages by the elastic release of the elastic piece 20, the insert is inserted. Multi-stage sealing of the hole can be surely ensured, and it is not necessary to inject the packer into the packing member as in the prior art, thereby saving construction time. In addition, since the packing member also functions as a spacer, a separate spacer is unnecessary, and since the reinforcing pipe is positioned at the center of the insertion hole 10 by the packing member, the construction can be precisely performed by ensuring the uniformity of the stress distribution. There is this.

On the other hand, the present invention in the step of drilling the insertion hole (H) data of the stratum characteristics for the interval section of the insertion hole, and in the step of inserting the reinforcement pipe 10 into the insertion hole in the interval section data of the stratum characteristics A plurality of packing members 30 are installed at intervals, and in the grouting step, it is more preferable to grout by controlling the injection amount and injection pressure of the grout agent according to the section data according to the strata characteristics.

That is, the packing member 30 is not installed at equal intervals, but is installed in accordance with the data of the section section obtained at the time of drilling, and then the injection amount and the injection pressure are differently applied to the insertion hole space partitioned according to the section. Effectiveness can be secured for the construction method, and thus the construction can be more perfect.

As described above, the pressure multi-stage grouting ground reinforcing method according to the present invention ensures the multi-stage sealing of the insertion hole by the pressure multi-stage grouting after the packing member to pack the insertion hole and the surrounding ground in multiple stages by the elastic release of the elastic piece It is possible to save construction time because it does not need to inject packer, and it does not need to install packer injection hose separately, which saves money and solves the problems caused by poor packer injection. Since it penetrates deeply into the joint or crushing zone of the surrounding ground, the grout sphere can be enlarged to maximize the ground reinforcing effect.

Claims (7)

Drilling an insertion hole in the ground; Inserting a reinforcing pipe having a through hole formed therein, wherein a plurality of packing members are installed at a predetermined interval to seal the insertion hole in multiple stages by the elastic release of the lateral spring; Releasing the elasticity of the lateral spring to seal the insertion hole in multiple stages by elastic pressure; Inserting a packer-mounted injection hose into the reinforcement pipe; And backing the injection hose step by step to grout the insertion holes partitioned by a plurality of packing members in sequence. According to claim 1, wherein the ground reinforcement method In the step of drilling the insertion hole, the geological characteristics data for the section of the insertion hole, In the step of inserting the reinforcing pipe into the insertion hole, a plurality of packing members are installed at intervals according to the data of the interval section according to the stratum characteristics, In the grouting step, the pressure multi-stage grouting ground reinforcing method, characterized in that the grouting by controlling the injection amount and the injection pressure in accordance with the interval data according to the stratum characteristics. delete The method according to claim 1 or 2, The packing member is composed of a double reinforcing fabric, the pressure multi-stage grouting ground reinforcement method characterized in that the padded foam is contained in the double reinforcing fabric. A reinforcing pipe inserted into the drilled insertion hole and having a plurality of packing members fixed at a predetermined interval to seal the insertion hole in multiple stages by elastic release of the lateral spring; The packer is mounted at the front, and includes an injection hose that is stepped backward in the reinforcement pipe while repeating the expansion and contraction of the packer, Multi-stage grouting ground reinforcing structure, characterized in that the grout injected through the injection hose grouting the insertion hole and the surrounding ground partitioned by the packing member. delete The method of claim 5, The packing member is composed of a double reinforcing fabric, the pressure multi-stage grouting ground reinforcement structure, characterized in that the expandable blowing agent is accommodated in the double reinforcing fabric.

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