KR101926086B1 - Tunnel reinforcing grouting device using urethan rapid injection system and grouting method - Google Patents

Abstract

The present invention relates to a tunnel reinforcement grouting device using a rapid urethane injection system and a grouting method using the same, in which construction costs are reduced and manpower handling convenience is improved by reducing the weight of inner hollow pipes, and a barrier material is mounted in a steel pipe so as to divide a chemical solution injection space, thereby improving construction environment. The present invention for implementing the same includes: a steel pipe main body (10) having a plurality of check valves (11) coupled for external ejection of urethane chemicals; a plastic hollow pipe (20) formed of a synthetic resin material and inserted into the steel pipe main body (10); a spacer (30) provided for maintaining a certain interval between the plastic hollow pipe (20) and the steel pipe main body (10); a front part injection pipe (40) connected for supplying the urethane chemicals to the front end side of the steel pipe main body (10); a rear part injection pipe (50) connected for supplying the urethane chemicals to the rear end side of the steel pipe main body (10); a barrier material (60) fitted into the center portion of the plastic hollow pipe (20) so as to divide the inner space of the steel pipe main body (10) into the front end portion and the rear end portion; a steel pipe closure cap (70) coupled to the inlet side of the steel pipe main body (10) so as to prevent the leakage of the urethane chemicals supplied to the inside of the steel pipe main body (10); and hollow pipe closure caps (80) respectively coupled to the front end portion and the rear end portion so as to prevent the introduction of the urethane chemicals to the inside of the plastic hollow pipe (20).

Description

TECHNICAL FIELD [0001] The present invention relates to a tunnel reinforcement grouting apparatus using a urethane quick injection system and a grouting method using the tunnel reinforcement grouting apparatus.

The present invention relates to a tunnel reinforcing grouting apparatus and method, and more particularly, to a grouting apparatus for performing a grouting operation for reinforcing a surface of a tunnel by using a urethane quick injection system having a short gel time, and a grouting method using the grouting apparatus will be.

Generally, various kinds of chemical solution injection methods are used for reinforcement and order of soft ground in civil engineering sites such as tunnel construction, and a urethane-based chemical solution or cement grout chemical solution is mainly used.

Particularly, the urethane chemical liquid has advantages of shortening the gel time (curing time) (about 60 seconds) and shortening the working time. On the other hand, due to the short gel time of the chemical liquid, The flow-down distance) is limited to 6 m, which causes a problem of poor workability and economical efficiency due to an increase in the amount of water.

In order to improve this, recently, an urethane chemical liquid is injected into a space between a stiffener steel pipe and an inner steel pipe in a state where an inner steel pipe having a somewhat smaller diameter is inserted inside a stiffener steel pipe, A technique of improving the length to 12 m has been carried out.

However, in the above-mentioned prior art, since the inner steel pipe is added to the double steel pipe structure, it increases the construction cost, and it is difficult to handle the workforce due to the weight of the steel, thereby lowering the workability. It is difficult to inject the chemical liquid even if the work is delayed for a short time, so that the construction environment is degraded.

In addition, it is necessary to increase the diameter of the steel pipe or to increase the length of the steel pipe because the ground is very soft due to the site conditions.

(Prior Art 0001) Korean Utility Model Registration No. 482898 (Registered on March 3, 2017) (Prior Art 0002) Korean Patent Registration No. 899621 (Registered May 20, 2009)

The present invention has been made in order to solve the problems in the prior art described above, and it is an object of the present invention to reduce the weight of a double-pipe type grouting steel pipe to facilitate manpower handling and reduce a construction cost.

Also, it is an object of the present invention to shorten the injection time and improve the workability by reducing the area of the urethane rubber material.

According to an aspect of the present invention, there is provided a grouting apparatus comprising: a steel pipe main body having a plurality of check valves for ejecting an urethane rubber material; A plastic hollow tube of a synthetic resin material inserted into the inside of the steel pipe body; A spacer provided to maintain a predetermined gap between the plastic hollow tube and the steel pipe main body; A front injection pipe connected to supply the urethane medicament to the tip side of the steel pipe main body; A rear injection pipe connected to supply the urethane medicament to the rear end side of the steel pipe main body; A partition wall member which is inserted into the hollow portion of the plastic hollow tube and divides an internal space of the steel pipe main body; A steel pipe closure cap coupled to an inlet side of the steel pipe main body to prevent leakage of the urethane chemical supplied to the inside of the steel pipe main body; And a hollow tube closure cap coupled to the distal end and the rear end, respectively, to prevent the urethane agent from flowing into the plastic hollow tube.

The present invention replaces the inner hollow tube installed with the lightweight plastic material for the purpose of reducing the area under the urea chemical solution, thereby reducing the construction cost and improving the working efficiency according to the ease of manpower handling.

In addition, since the inner space of the steel pipe is divided into a plurality of spaces by using the barrier rib material, the chemical solution is supplied by simultaneous injection into each divided space, so that the reduction of the area of the submerged area is followed by further reduction of the working time due to the reduction of the submerged length, Securing additional time between gel times and thus improving the workability.

1 is a sectional view of a grouting device according to a first embodiment of the present invention.
2 is a sectional view taken along the line AA in Fig.
3 is a sectional view taken along the line BB in Fig.
4 is an enlarged sectional view of the annular partition wall in the present invention.
Fig. 5 is an enlarged view of the shape of the partition wall member when the plastic hollow tube is inserted into the grouting device of the present invention. Fig.
6 is a state in which the partition wall member is deformed when urethane is supplied to the grouting apparatus of the present invention.
FIG. 7 is a structural view of a grouting apparatus of a straight hole type according to a second embodiment of the present invention. FIG.
8 is an enlarged view of a portion C in Fig.
9 is a cross-sectional view showing a state in which a steel pipe closure cap is removed in a second embodiment of the present invention.
10 is a cross-sectional structural view of a grouting apparatus according to a third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the construction of a tunnel reinforcement grouting apparatus using the urethane quick injection system according to the first embodiment of the present invention will be described with reference to FIG. 1 to FIG.

In this embodiment, a cylindrical tube body 10 having a plurality of check valves 11 for external ejection of a urethane rubber material is inserted and joined to an injection hole, A plastic hollow tube 20 made of a lightweight synthetic resin material inserted into the hollow tube 20 and a spacer 30 provided to maintain a predetermined distance between the plastic hollow tube 20 and the steel pipe body 10, A rear inflow pipe 50 connected to supply a urethane medicament to the rear end side of the steel pipe main body 10, a plastic hollow tube 20 connected to the front side inflow pipe 40, A partition wall member 60 which is fitted in the intermediate portion of the steel pipe main body 10 and divides the internal injection space of the steel pipe main body 10 into a front end side and a rear end side; Steel to prevent leakage of medicines It consists of a closed cap 70, and a hollow plastic tube closed cap 80 coupled respectively to the front end and the rear end portion to prevent the polyurethane drug flows into the interior of the hollow tube 20.

At this time, the partition member 60 is made of a soft rubber material and has an annular shape as shown in Fig. 4, and is inserted into the plastic hollow tube 20 in the form of an indentation.

Also, it can be seen that the front injection pipe 40 has a length longer than the rear injection pipe 50 and penetrates the inside of the plastic hollow pipe 20.

The plastic hollow tube 20 according to the present embodiment has a single integral structure to position the barrier rib material 60 at the intermediate portion or to connect two of them if necessary, It is also possible to join the ash 60.

Hereinafter, effects of the grouting apparatus according to the present invention will be described.

When the urethane chemical liquid is supplied at a high pressure in a state where the grouting device of the present invention is inserted into the tunnel hole at the time of the tunnel construction, the ground reinforcement work is performed on the tunnel surface.

That is, at this time, since the lightweight plastic hollow tube 20 is installed in the inside of the steel pipe body 10 for the purpose of reducing the area of the steel pipe, the work and the workability according to the ease of handling of the human hand are improved in the process of inserting the hole .

Meanwhile, in the urethane chemical liquid supply process, the urethane chemical liquid is simultaneously supplied through the front injecting pipe 40 and the rear injecting pipe 50, so that the urethane chemical liquid is supplied to the front and rear parts divided by the partition member 60, The distance is reduced to 1/2, so that even if the actual steel pipe body 10 is used for 12 m, the injection length can be effectively shortened to 6 m.

Particularly, in the present invention, when the initial plastic hollow tube 20 is inserted, the annular partition wall member 60 is deformed in one direction by friction with the inner wall surface of the steel pipe body 10 as shown in FIG. 5 However, when the urethane chemical liquid is supplied, the partition wall member 60 is deformed by the pressure of the chemical liquid supplied through the rear injection pipe 50 having a relatively short length as shown in FIG. 6, The pressure of the chemical liquid supplied through the long front injecting pipe 40 is increased so that the state in which the adhesion with the inner wall surface of the steel pipe body 10 is increased can be maintained.

When the pressure of the inner chemical liquid in the grouting steel pipe reaches a predetermined amount or more, the discharge is rapidly performed through the check valve 11 to the ground on the tunnel surface.

Therefore, the present invention can reduce the construction cost and improve the workability by replacing the inner hollow tube installed for the purpose of decreasing the area of the lowered portion with the lightweight plastic hollow tube 20. By using the partition wall material 60, Simultaneous injection is performed both forward and backward in the state where the chemical solution injection space is divided into two, so that the injection length 12m according to the reduction of the dropping distance is shortened to 6m, and the operation time Shortening the time, securing additional time between work time and gel time, and thus improving the workability.

7 to 9 show a grouting steel pipe structure in the form of a straight hole in which a steel pipe is installed at the same time as the excavation according to the second embodiment of the present invention. The drilled bit 90 for the drilling of the straight drill is constituted.

A fitting hole 71 for attaching and detaching the steel pipe closure cap 70 is fixed to the rear end of the steel pipe body 10 by means of a fastening bolt 72. Inside the steel pipe closure cap 70, The screw cap tabs 70a and 71a for screw tightening are formed in the attachment / detachment port 71 and the steel pipe closure cap 70, .

In the grouting steel pipe according to the present embodiment having such a structure, the drilling operation is performed by using the drilling bit 90 when the drilling is performed. When the drilling operation is completed, (60) is inserted into the plastic hollow tube (20) fastened to the stop, and the steel pipe closure cap (70) is attached to the rear end. Simultaneous injection of the front and rear parts of the urethane chemical liquid is performed.

At this time, in the installation process, the steel pipe closure cap 70 is screwed by the attaching / detaching port 71 and the screw tab portions 70a and 71a, so that the joining operation can be performed more quickly and easily. The leakage of the chemical liquid can be prevented.

FIG. 10 shows a configuration according to the third embodiment of the present invention, in which the injection space in the steel pipe is further divided to reduce the dropping distance and maintain the appropriate dropping distance.

That is, at this time, the plastic hollow tube 20 is divided into a plurality of connection sockets 21 and 22, which are formed at both sides of the divided connection sockets, and the both connection sockets 21 and 22 are made of lightweight plastic And is connected by a connecting hollow tube (23) made of a material.

Particularly, the connecting hollow tube 23 is formed to have a diameter smaller than that of the plastic hollow tube 20, and the connecting sockets 21 and 22 have outer diameters from the plastic hollow tube 20 side toward the connecting hollow tube 23 side It can be confirmed that the intermediate portion injection pipe 24 for supplying the urethane medicament to the space outside the connection hollow pipe 23 at the installation site of the connection sockets 21 and 22 is additionally connected .

The injection space in the steel pipe main body 10 is further divided by at least two partition members 60 while the front part injection pipe 40 and the middle part injection pipe 24 are inserted into the respective divided spaces, The simultaneous supply of the respective urethane chemical liquids can be performed through the front and rear injection pipes 50,

Particularly, since the connection hollow tubes 23 having a relatively small diameter are provided in the connection socket 21 or 22 in the form of a cross section, the chemical liquid can be supplied from the connection hollow tube 23 to the intermediate portion.

Therefore, when the structure of the present embodiment is applied to increase the diameter of the steel pipe and increase the length of reinforcement, it is necessary to reduce the distance of the submerged pipe, maintain the proper submerged distance It is possible to exhibit an advantage that construction can be performed without affecting the urethane chemical solution gel time.

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Although specific embodiments of the present invention have been described and illustrated above, it is to be understood that the grouting device structure of the present invention can be variously modified by those skilled in the art.

It should be understood, however, that such modified embodiments are not to be understood individually from the spirit and scope of the invention, and such modified embodiments are intended to be included within the scope of the appended claims.

10: Steel pipe body 11: Check valve
20: plastic hollow tube 30: spacer
40: front inflow pipe 50: rear inflow pipe
60: barrier rib material 70: steel tube closure cap
80: Hollow tube closure cap 90: Direct drilling bit

Claims (6)

A steel pipe main body 10 to which a plurality of check valves 11 for external ejection of the urethane rubber material are coupled;
(21, 22) are fastened to both sides of the divided part, and the both side connection sockets (21) are connected to a connection hollow tube And the connection hollow tube 23 is formed to have a diameter smaller than that of the plastic hollow tube 20 and the connection sockets 21 and 22 are connected to each other through the connection hollow tube 20 from the plastic hollow tube 20 side, (24) for supplying the urethane medicine to the space outside the connection hollow tube (23) at the installation site of the connection socket (21, 22) is added to the connection socket A plastic hollow tube 20 made of a synthetic resin material connected to the hollow tube 20;
A spacer 30 provided to maintain a predetermined gap between the plastic hollow tube 20 and the steel pipe body 10;
A front injection pipe 40 connected to the leading end side of the steel pipe main body 10 to supply a urethane medicine;
A rear injection pipe (50) connected to supply the urethane medicament to the rear end side of the steel pipe body (10);
A partition wall member (60) for dividing the inner space of the steel pipe main body (10) into a front end side and a rear end side by being fitted into a middle portion of the plastic hollow tube (20);
A steel pipe closure cap 70 coupled to the inlet side of the steel pipe body 10 to prevent leakage of the urethane agent supplied therein;
A hollow tube closure cap 80 coupled to the distal end and the rear end, respectively, for preventing the urethane agent from flowing into the plastic hollow tube 20;
Wherein the tunnel reinforcement grouting apparatus comprises a tunneling reinforcement grouting apparatus using a urethane quick injection system. The method according to claim 1,
A straight hole 90 is formed in the front end portion of the steel pipe body 10 and a detachment hole 71 for attaching and detaching the steel pipe closing cap 70 is attached to the fastening bolt 72 at the rear end of the steel pipe body 10 And a rubber plug 73 for maintaining the airtightness due to the pressure with the inlet of the steel pipe main body 10 is formed inside the steel pipe closure cap 70. The rubber stopper 73 and the steel pipe closure cap 70 70 are formed with threaded tabs 70a, 71a for fastening the screws to each other. delete delete delete A tunnel reinforcement grouting method using a urethane quick injection system, characterized in that a urethane rubber material is rapidly injected into a tunnel surface by using a grouting device according to any one of claims 1 and 2.

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