KR101709737B1

KR101709737B1 - Direct injection grouting method for reinforcing buried steel pipe

Info

Publication number: KR101709737B1
Application number: KR1020150131476A
Authority: KR
Inventors: 장주석
Original assignee: 태현개발(주)
Priority date: 2015-09-17
Filing date: 2015-09-17
Publication date: 2017-02-23

Abstract

The grouting method according to the present invention comprises: a first step of sensing a position of a perturbation gap formed in the periphery of a press-fit steel pipe press-fitted into the ground; Wherein the injection tube is inserted into the ground through a plurality of injection holes formed in the wall of the press-fit steel pipe through the injection port corresponding to the disturbance gap, and the injection tube is pulled in until the injection hole formed at the tip side of the injection tube is located in the disturbance gap The poem is the second stage; A third step of connecting a sealing material supply pipe to a rear end of the injection pipe; And a fourth step of supplying a sealing material through the injection tube and injecting the sealing material into the perturbation cavity through the injection hole. According to the grouting method of the present invention, since the sealing material can be filled not only in the outer wall void formed around the outer wall surface of the press-fit steel pipe but also at the disturbance pore formed at a position spaced from the press-fit steel pipe by a certain distance, The sealing material can be stably injected into each space without the risk of clogging of the nozzle or the backflow of the sealing material and the sealing material can be injected into the outer wall gap and the disturbance air gap in one step and the construction period can be remarkably shortened.

Description

Technical Field [0001] The present invention relates to a direct injection grouting method for reinforcing a buried steel pipe,

The present invention relates to a grouting method for filling a gap formed in a ground by pressurizing a steel pipe in a ground, and more particularly, to a method for filling a gap between a disturbance gap at a point separated from a press- To a grouting method.

In the construction of roads, sewerage, communication, electric power, etc., roads, rivers, railways, etc. are not installed and the pipes are shaped so that they can be purchased without affecting traffic flow or ground water. Has recently been commercialized.

Generally, a steel pipe propulsion method is a method in which a tunnel slightly longer than the length of the unit steel pipe is installed in the ground at the beginning of the point where the pipe is intended to be buried, and the steel pipe is laid down in this tunnel to direct the tip of the steel pipe to the side wall of the tunnel In which a steel pipe is pressed into the ground by pushing the rear end of the steel pipe forward by using a hydraulic jack, the gravel in the steel pipe is discharged to the outside by gravity, and the other steel pipe is connected to the rear end of the steel pipe, It is a noninvasive excavation method.

However, when the steel pipe press-in method as described above is used, the ground is disturbed and loosened when the propulsion steel pipe is advanced due to the change of the underground soil, thereby causing a problem in the stability of the ground. In addition, since the soil is removed by pushing and removing foreign materials such as earthworms, gravel, ovoids, etc., there is a problem that the ground is deformed or causes residual settlement, thereby causing damage to the upper structure.

In order to solve the above problems, a steel pipe presser equipped with a nozzle for grouting and a steel pipe press method using the same (Korean Patent Laid-Open No. 10-2005-0102069) have been proposed. When the above-mentioned steel pipe indenting method is used, a sealing material (hereinafter referred to as "sealing material") such as cement milk and a mixture of liquid type plasticizers can be filled in the pores in contact with the side surface of the steel pipe, have.

However, in the case of using the conventional steel pipe indwelling method as described above, the sealing material can be filled in the pores in contact with the side surface of the steel pipe, that is, the outer wall pores. However, the pores formed between the ground and the steel pipe, It can not be filled, so there is a disadvantage that there is a limit to the overall reinforcement of the ground.

KR 10-2005-0102069 A

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method of manufacturing a pressurized steel pipe which can fill a disturbance gap formed at a position distant from a press- The present invention provides a grouting method which can be carried out in a single process.

According to another aspect of the present invention, there is provided a grouting method comprising:

A first step of detecting a disturbance pore position formed in the periphery of a press-fit steel pipe pressurized into the ground;

Wherein the injection tube is inserted into the ground through a plurality of injection holes formed in the wall of the press-fit steel pipe through the injection port corresponding to the disturbance gap, and the injection tube is pulled in until the injection hole formed at the tip side of the injection tube is located in the disturbance gap The poem is the second stage;

A third step of connecting a sealing material supply pipe to a rear end of the injection pipe;

Supplying the sealing material through the injection tube and injecting the sealing material into the disturbance gap through the injection hole;

.

Wherein the injection tube comprises a tip tube having a spray hole formed at a side and a tip thereof and at least one connection tube connected in series at a rear end of the tip tube,

The second step includes the steps of inserting the end tube into the ground through the injection tube, connecting the tip of the connection tube to the rear end of the end tube, and inserting the connection tube and the end tube connected thereto into the ground &Lt; / RTI >

A spiral is formed on the outer surface of the front end tube and the connection tube,

The second step is configured to draw the end tube and the connection tube into the ground by rotating the end tube and the connection tube.

Separating the sealing material supply pipe from the injection pipe, connecting the sealing material supply pipe to the inlet pipe, supplying a sealing agent to the sealing material supply pipe, And a fifth step of spraying the sealing material onto the outer wall gap formed on the surface.

The sealing material supply pipe is provided with a pressure gauge for measuring the internal pressure,

The injection tube inserted into the ground in the second step is positioned so that the injection hole passes through the lower disturbance gap and then is located in the upper disturbance gap,

In the fourth step, the injection tube is drawn out while injecting the sealing material through the injection hole, and the drawing of the injection tube proceeds only when the internal pressure of the sealing material supply tube is equal to or higher than the reference value.

According to the grouting method of the present invention, since the sealing material can be filled not only in the outer wall void formed around the outer wall surface of the press-fit steel pipe but also at the disturbance pore formed at a position spaced from the press-fit steel pipe by a certain distance, The sealing material can be stably injected into each space without the risk of clogging of the nozzle or the backflow of the sealing material and the sealing material can be injected into the outer wall gap and the disturbance air gap in one step and the construction period can be remarkably shortened.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing the shapes of outer wall voids and disturbance voids formed in the ground around a press-fit steel pipe.
2 to 4 are exploded views of an injection tube used in a grouting method according to the present invention.
5 is a partial cross-sectional view sequentially showing a construction process of the grouting method according to the present invention.
6 is an enlarged cross-sectional view showing a coupling structure of a steel pipe injection socket.
FIGS. 7 and 8 show a process of continuously injecting a sealant into a plurality of disturbance cavities.

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

1 is an exploded view of an injection pipe used in a grouting method according to the present invention, and Fig. 5 is an exploded perspective view of an injection pipe according to the present invention FIG. 6 is an enlarged sectional view showing a joint structure of a steel pipe injection socket. FIG.

In the grouting method according to the present invention, when the steel pipe is press-fitted into the ground, the outer wall gap 12 may be formed around the outer wall surface of the press-fitting steel pipe 20 by the pressure input of the steel pipe as shown in FIG. When a plurality of voids are formed in the ground 10, there is a possibility that the ground 10 is settled down. Therefore, the voids are filled with a sealing material 30 such as cement milk and a liquid type plasticizer mixture Is preferably filled.

At this time, the sealing material 30 can be injected into the outer wall gap 12 formed around the outer wall surface of the press-fitting steel pipe 20 through the plurality of injection holes 22 formed in the wall surface of the press-fitting steel pipe 20. However, There is a problem in that it is difficult to inject the sealing material 30 into the disturbance gap 14 which is spaced apart from the press-fitting steel pipe 20 by a certain distance.

The grouting method according to the present invention has been developed in order to solve such a problem. The grouting method according to the present invention is designed to insert the injection tube 100 into the ground around the press-fitting steel pipe 20 in the press- Not only the outer wall gap 12 formed around the outer wall surface of the press-fit steel pipe 20 but also the disturbance air gap 14 spaced from the press-fit steel pipe 20 by a certain distance is formed by injecting the sealing material 30 through the spray hole 112 formed in the press- The sealing member 30 can be stably injected even in the case where the sealing member 30 is provided.

That is, when the ground 10 is to be reinforced according to the grouting method of the present invention, as shown in FIG. 5 (a), a gap detection sensor 200 capable of sensing voids in the ground is used And a plurality of injection ports 22 formed on a wall surface of the press-fitting steel pipe 20 with an injection port 22 corresponding to a point where the perturbation gap 14 is located, The injection tube 100 is inserted into the ground through the injection port 22 corresponding to the disturbance air gap 14. The air gap sensing sensor 200 for sensing the air gap existing in the ground is a kind of sensing equipment commercialized in the technical field of the present invention. Therefore, the internal structure and operation principle of the air gap sensing sensor 200 A detailed description thereof will be omitted.

If the length of the injection tube 100 is larger than the inner diameter of the press-fitting steel pipe 20, the injection tube 100 may be press- There is a problem that it is difficult to insert the injection tube 100 into the ground in the steel pipe 20. 2 to 4, the injection tube 100 includes a tip tube 110 having a spray hole 112 formed at a side and a tip thereof, and a tip tube 110 connected in a line at a rear end of the tip tube 110 And at least one connection pipe 120 is preferable. As shown in FIG. 5 (a), when the end tube 110 is connected to the first end tube 110 and the connection tube 120, The connecting tube 120 is joined to the rear end of the front end tube 110 and the press fitting is repeated so that the disturbance air gap (as shown in FIG. 5 (b) 14 can also position the injection hole 112 of the injection tube 100.

When the ground 10 is torn, the injection tube 100 can be inserted into the ground only by pushing the injection tube 100 in the longitudinal direction. However, if the ground 10 is rigid, Work can be difficult. A spiral is formed on the outer surface of the distal end tube 110 and the connecting tube 120 so that the distal end tube 110 and the connecting tube 120 are rotated when the distal end tube 110 and the connection tube 120 are rotated, It is preferable to let it enter the ground. When the ground 10 is not very rigid, the spiral formed on the outer surface of the front end pipe 110 and the coupling pipe 120 may be formed in a spiral shape as shown in FIG. 2, May be formed in a thread-like shape as shown in Fig. As described above, when the spiral is formed on the outer surface of the end tube 110 and the coupling tube 120, even if the ground 10 is rigid, the injection tube 100 can be inserted into the ground without any additional excavation work .

Of course, the tip tube 110 and the coupling tube 120 may be formed in a circular tube shape in which the outer surface is not formed with a spiral, that is, the outer surface is smooth as shown in FIG. When the end tube 110 and the connection tube 120 are formed in the shape of a circular tube and the ground 10 is rigid, it is preferable that before the end tube 110 is inserted into the ground, It is necessary to first drill the through-hole of the stator from the injection port 22 to the disturbance gap 14.

As shown in FIG. 2, the front end pipe 110 and the connection pipe 120 may be directly coupled to each other by forming a male thread and a female thread at one side in the longitudinal direction. As shown in FIG. 3, The connection pipe 120 may be connected to the inside of the connection pipe 120 by a separate connection nipple 130 which is inserted into the connection pipe 110 and the connection pipe 120. As shown in Figure 4, Or may be connected by a connection socket 140 which is inserted into the inside. A detailed description of the connection structure between the end tube 110 and the coupling tube 120 is provided in the following description of the structure in which the two tube members are connected in series in the longitudinal direction, It is omitted.

5 (c), the sealing material supply pipe 300 is connected to the rear end of the injection pipe 100, and as shown in FIG. 5 (d) The sealing material 30 is supplied through the injection tube 100 and the sealing material 30 is injected into the perturbing space 14 through the perforation hole 112 so that the perturbing space 14 is sealed with the sealing material 30 To be filled.

The grouting method according to the present invention can fill the inside of the disturbance gap 14 spaced a certain distance from the press-fit steel pipe 20 with the sealing material 30. Therefore, the ground 10 and the press- It is advantageous that it can be more stably and effectively reinforced. Since the grouting method according to the present invention is configured to fill the sealing material 30 by individually inserting the injection tube 100 into each of the disturbance voids 14, the position and size of each disturbance void 14, The filling amount of the sealing material 30 can be individually adjusted according to the characteristics of the ground 10 and the new filling tube 100 is inserted into the disturbance gap 14 where the sealing material 30 is not filled normally, It is possible to reliably fill the sealing material 30 with all of the perturbing gaps 14, since the filling can be tried again. Further, since the sealing material 30 can be filled not only in the outer wall gap 12 or the disturbance air gap 14 generated in the process of pressurizing the steel pipe, but also in the existing sink hole, it is possible to reinforce the ground 10 as a whole Effect can also be obtained.

The grouting method according to the present invention can be carried out in a single step from the filling of the sealing material 30 to the disturbance gap 14 and the filling of the sealing material 30 to the outer wall gap 12. 5 (d), when the sealant 30 is injected through the injection hole 112 of the injection tube 100 to fill the sealant 30 in the perturbation gap 14, The sealing pipe 300 is separated from the injection pipe 100 and the steel pipe injection socket 400 is fastened to the injection pipe 22 and then the sealing material pipe 300 is connected to the steel pipe injection socket 400 e), the sealing material 30 can be injected into the outer wall gap 12. [

The outer surface of the steel pipe injection socket 400 is in close contact with the inner wall of the injection port 22 of the press-fitting steel pipe 20. The sealing material 30 supplied through the sealing material supply pipe 300 passes through the steel pipe injection socket 400, Lt; / RTI > In this case, the steel pipe injection socket 400 is a component for guiding the sealing material 30 supplied from the outside to the outer wall gap 12, and is similar to the conventional grouting method, A detailed description of the internal structure and the coupling structure is omitted.

As described above, by using the grouting method according to the present invention, the inside of the disturbance air gap 14 and the outer wall gap 12 located around the press-in steel pipe 20 can be filled with the sealing material 30, (10) and the press-fitting steel pipe (20) can be reinforced more quickly and effectively.

Figs. 7 and 8 show a process of continuously injecting the sealing material 30 into the plurality of disturbance gaps 14.

When the position of the disturbance gap 14 is measured on the ground using the gap detection sensor 200 when the two disturbance air gaps 14 are arranged as shown in FIG. 7, the disturbance air gap 14 Can be detected accurately, but the disturbance gap 14 located on the lower side may be difficult to accurately detect. Therefore, there is a possibility that the sealing material 30 is filled only in the upper part of the perturbation gap 14, and the sealing material 30 can not be filled in the lower part of the perturbation space 14.

In order to solve the above problems, the grouting method according to the present invention is provided with a pressure gauge 320 for measuring the internal pressure of the sealing material supply pipe 300, and the spray hole 112 penetrates the lower disturbance gap 14 The injection tube 100 may be inserted into the upper disturbance gap 14 and then injected through the injection hole 112 while injecting the sealing material 30. At this time, the drawing of the injection tube 100 proceeds only when the internal pressure of the sealing material supply tube 300 is equal to or higher than the reference value. When the internal pressure of the sealing material supply tube 300 is lower than the reference value, the injection tube 100 is temporarily stopped .

A process of injecting the sealing material 30 in a state where the operation of the sealing material supply pipe 300 is set as described above will be described below.

8 (a), when the sealing material 30 is injected in a state where the injection hole 112 is located in the upper disturbance gap 14, the sealing material 30 in the sealing material supply pipe 300 is injected into the injection hole 112 to the upper disturbance gap 14 so that the pressure in the sealing material supply pipe 300 is kept below the reference value. Therefore, the sealing material supply pipe 300 is not withdrawn from the perturbing gap 14 but continues to supply the sealing material 30.

The sealing material 30 in the sealing material supply pipe 300 is no longer sprayed and the pressure in the sealing material supply pipe 300 rises after the upper disturbance air gap 14 is filled with the sealing material 30, . When the pressure in the sealing material supply pipe 300 rises above the reference value, the sealing material supply pipe 300 is drawn out from the upper disturbance gap 14 as shown in FIG. 8 (b) The sealing material 30 in the sealing material supply pipe 300 is not sprayed so that the pressure in the sealing material supply pipe 300 is continuously maintained above the reference value so that the spray hole 112 is in contact with the lower disturbing air gap The discharging of the sealing material supply pipe 300 is continuously performed until the sealing material supply pipe 300 is positioned in the discharge opening 14. At this time, if the sealant pump 310 continuously compresses and supplies the sealant 30 in a state in which the sealant 30 in the sealant supply pipe 300 can not be sprayed, the pressure in the sealant supply pipe 300 is excessively increased, The sealant pump 310 can be set to pause the operation when the pressure in the sealant supply pipe 300 rises above the reference value.

The seal member 30 in the seal member feed pipe 300 is ejected as shown in FIG. 8 (c) when the seal member feed pipe 300 continues to be drawn out and the injection hole 112 is located in the lower disturbance air gap 14, The pressure in the sealing material supply pipe 300 falls below the reference value so that the lowering of the sealing material supply pipe 300 is temporarily stopped and only the sealing material 30 is injected into the lower disturbance air gap 14. When the lower disturbance air gap 14 is filled with the sealing material 30 and the pressure in the sealing material supply pipe 300 rises again beyond the reference value, the sealing material supply pipe 300 is drawn out from the lower disturbance air gap 14, Is completed.

As described above, when the sealing material supply pipe 300 is operated, there is an advantage that all of the disturbing air gaps 14 can be filled with the sealing material 30 when the plurality of disturbance air gaps 14 are arranged up and down. At this time, the pulling out of the sealing material supply pipe 300 may be manually performed by the operator while observing the numerical value of the pressure gauge 320, or a driving device (not shown) for pulling out the sealing material supply pipe 300 may be additionally provided, And may be configured to be automatically controlled by the numerical value of the battery 320.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the invention.

10: Ground 12: Exterior wall gap
14: disturbance gap 20: indentation steel pipe
22: inlet 30: sealing material
100: injection tube 110: end tube
112: vent hole 120: connector
130: connection nipple 140: connection socket
200: air gap sensor 300: sealing material supply pipe
310: sealing material pump 320: pressure gauge
400: Steel pipe injection socket

Claims

(a) An upper disturbance gap (14) formed around the press-fitted steel pipe (20) pressured into the ground is detected by using a gap detection sensor (200) for sensing a gap formed on the upper side of the ground above the ground, Identifying;
(b) injecting the injection tube 100 into the ground through the injection port 22 of the press-fitting steel pipe 20 corresponding to the disturbance gap 14, and injecting the injection hole 100 formed at the tip side of the injection tube 100 112) into the upper disturbance gap (14);
(c) connecting the sealing material supply pipe 300 to the rear end of the injection tube 100, and injecting the sealing material 30 into the perturbation space 14 to fill the inside of the upper perturbation space 14;
(d) After separating the sealing material supply pipe 300 from the injection pipe 100, the steel pipe injection socket 400 is fastened to the injection hole 22, and the sealing material supply pipe 300 is connected to the steel pipe injection socket 400, Filling the outer wall gap 12 with the sealing material 30 by spraying the outer wall gap 12 formed on the outer wall surface of the press-fitting steel pipe 20 through the sealing material supply pipe 300;
(e) The lower disturbance gap 14 is sensed using a pressure gauge 320 installed in the sealing material supply pipe 300, and the sealing material 30 is injected through the injection hole 112, Detecting the internal pressure through the pressure gauge (320) in the process of extracting the lower disturbance gap (14) and judging the lower disturbance gap (14) when the sensed internal pressure is lower than the reference value; And
(f) injecting the sealing material (30) into the lower disturbance gap (14) through the injection tube (100) to fill the inside of the lower disturbance gap (14); , &Lt; / RTI &
In the steps (c) and (f), when the internal pressure sensed by the pressure gauge 320 is equal to or higher than the reference value in the course of filling the upper and lower disturbance cavities 14, the filling tube 100 is taken out and,
The injection tube 100 includes a front end tube 110 having a spray hole 112 formed at a side and a front end thereof and at least one connection tube 120 connected in series at a rear end of the front end tube 110, A spiral is formed on the outer surface of the front end tube 110 and the connection tube 120 to rotate the front end tube 110 and the connection tube 120 to rotate the distal end tube 110 and the connection tube 120 Respectively,
Wherein the grouting method is a direct injection grouting method for reinforcing a press-in steel pipe.

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