KR20090127593A - Apparatus of two-way tow-grouting and the method - Google Patents

Abstract

PURPOSE: A bidirectional pressure type tow-grouting apparatus and method are provided to improve bearing capacity of a front end part of a pile, and save working time when a grouting work. CONSTITUTION: A bidirectional pressure type tow-grouting apparatus is composed as follows. A Y-shaped branch pipe(32) is formed in an injection hose(30) for injection pressure controlling and a grouting work. Pressure gauges(33) are respectively coupled with two branches of the injection hose from the Y-shaped branch pipe. Pressure control valves(34) are respectively coupled with the bottom of the pressure gauges for pressure controlling of the pressure gauges.

Description

Bidirectional pressure tow grouting apparatus and method {Apparatus of two-way tow-grouting and the method}

The present invention relates to a bidirectional pressure tow grouting apparatus and a method thereof, and more particularly, in performing tow grouting, grouting is performed by adjusting the injection pressure by simultaneously grouting in both directions of the inlet and outlet holes after the grouting of the outlet holes. The present invention relates to a bidirectional pressure tow grouting apparatus and a method for increasing the area of a.

In general, grouting is a method of injecting filler into cracks or cavities for ground stability and leakage prevention in various civil works such as tunnel construction and retaining wall construction. Such grouting is to insert a hollow tube having a plurality of ejection holes in a state in which holes are drilled in the weak ground, and then coagulated by injecting a filler such as urethane by coercion.

For example, when reinforcing the ground and preventing leakage of soil in the tunnel and reinforcing the crack of the rock, insert the steel pipe with many injection holes into the hole drilled into the ground and then apply the injection material to the inside of the steel pipe. Grouting method is widely known to forcibly fill the cracks of the ground through the injection hole of the steel pipe by forced injection.

Particularly, the conventional grouting method and method thereof will be described with reference to FIG. 1. That is, when crushed rock exists at the tip of pile during construction of the cast-in-place pile or foreign matter such as slime and weathered residual soil remains, the ground is loosened by vibration due to excavation, so that settlement and deformation by upper load may occur. Toe grout is performed at the tip of the pile, and the method further drills at least 1 m at the tip to perform the tow grout at the pile tip, and removes any remaining slime or weathered residual soil. (a)), it is removed by using fresh water (Fig. 1 (b)), and when the removal of these foreign substances is finished, pressure grouting is performed on the steel pipe pipe to grout when the outflow of clean injector is confirmed at the entry and exit hole. Grouting is performed in the inlet hole 21 (FIG. 1C), and further, the inlet hole 21 is blocked and pressure grouting is performed in the outlet hole 22. It is to (in Fig. 1 (d)).

However, in the conventional grouting apparatus and the method as described above, air or fresh water was used to remove slime, and in particular, in the case of using fresh water, large-scale slime remains in the cavity and monolayer clay in the rock ) Is difficult to remove. In addition, by using one-way grouting during grouting, the working time is not only long but the pressure cannot be controlled on both sides, and thus the grouting area is not widened, and the effect of increasing the bearing capacity of the pile tip is not good. There is.

In order to solve the problems described above, in the present invention, the Y type branch pipe is formed in the injection hose of the injection material, the pressure gauge is coupled to each of the two injection hoses coming out of the Y type branch pipe, the Y type In order to control the pressure of the pressure gauge provided in the two injection hoses coming out of the branch pipe, each pressure control valve is coupled to the lower part of the pressure gauge to increase the efficiency of working time during grouting operation, thereby saving work time and expanding the grouting area. The purpose of the present invention is to provide a bidirectional tow grouting device and a method for improving the bearing capacity of the pile tip and removing all foreign matter more easily by using a suction pump for cleaning the grout for the grouting operation.

In order to achieve the object of the present invention, in the case of the construction site cast piles, when the fractured rock exists at the tip of the pile or foreign matters such as slime and weathered residual soil, the ground is relaxed by vibration due to excavation and does not have sufficient strength In order to control the injection pressure and facilitate grouting, a Y-shaped branch pipe is formed in the injection hose of the injection material in order to adjust the injection pressure and facilitate grouting. A pressure gauge is coupled to each of the two injection hoses coming out of the type branch pipe, and a pressure control is provided at the bottom of each pressure gauge to control the pressure of the pressure gauge provided in each of the two injection hoses coming from the Y type pipe. The valve is engaged.

In particular, the packer device equipped with a non-return valve for preventing the back flow of the injection material in the grouting operation is further configured.

In addition, a suction pump is used to inhale air to remove foreign matters such as slime or weathered residual soil to perform tow grouting.

A grouting method for achieving the object of the present invention includes a tow grouting method, comprising: a first step of first attaching to a reinforcing bar to install a sleeve for drilling; A second step of drilling; A third step of removing foreign matters in the air by using compressed air or fresh water or a suction pump; A fourth step of installing a packer having a pressure gauge coupled to each injection hose branched into a Y-type branch pipe, a pressure control valve coupled to each lower end of the pressure gauge, and a back flow prevention valve mounted therein; A fifth step of grouting the inflow hole after confirming that the clean injection material flows out of the outflow hole; And a sixth step of adjusting the pressure through the pressure regulating valve while performing bidirectional pressure grouting on the inlet and outlet holes.

As described above, in the present invention, a Y-type branch pipe is formed in the injection hose of the injection material, and a pressure gauge is coupled to each of the two injection hoses exiting from the Y-type branch pipe, and the two exits from the Y-type branch pipe. In order to control the pressure of the pressure gauge provided in each of the fork injection hoses, the pressure control valve is configured to be coupled to the lower part of the pressure gauge, so that the work can be carried out more efficiently, thereby reducing the work time and the bidirectional soil by the Y-type branch pipe. By adjusting the pressure appropriately through the pressure regulating valve of the right grouting device, there is an effect of expanding the grouting area and thus increasing the bearing capacity of the pile tip. In addition, in removing foreign substances in the ball for grouting, there is an effect that the grouting operation can be performed more smoothly by removing large particles of slime or monolayer clay using a suction pump instead of conventional fresh water.

Figure 1 (a) is a schematic diagram of removing the slime using conventional compressed air, Figure 1 (b) is a schematic diagram of removing the slime using conventional fresh water, Figure 1 (c) is a conventional Figure 1 is a schematic diagram of the pressure grouting step of the injection hole, Figure 1 (d) is a schematic diagram of the pressure grouting step to block the conventional injection hole and the outlet hole (22).

2 is a step of removing using air (Fig. 2 (a)) and fresh water (Fig. 2 (b)) or a suction pump (Fig. 2 (c)) during the removal of slime for grouting operation according to the present invention. It is a schematic diagram of.

Figure 3 is a schematic diagram of the step of pressure grouting the injection hole after installing the Y-type branch pipe according to the present invention, Figure 4 is a bidirectional pressure grouting by adjusting the pressure using the Y-type branch pipe according to the present invention It is a schematic diagram of steps.

5 is a flow chart of a method of operation of bidirectional pressure tow grouting in accordance with the present invention.

Hereinafter, with reference to the drawings will be described a preferred embodiment of the present invention.

1 illustrates a conventional grouting apparatus and method thereof, which has already been described. Figure 2 is to remove slime and the like by using the compressed air 13, fresh water 25 or the suction pump 70 during the grouting operation according to the present invention, when using the conventional fresh water 25 Large slime remains in the cavity, and it is difficult to remove monolayer clay, etc. of the rock, so that the foreign matter can be more effectively removed using the suction pump 70 as in the present invention.

In addition, the bidirectional pressure tow grouting device in the grouting operation according to the present invention, as shown in Figures 3 and 4, the Y-shaped branch pipe 32 is formed in the injection hose 30 for ease of adjustment of the injection pressure and grouting operation. The pressure gauge 33 is coupled to each of the two injection hoses 30 coming out of the Y-shaped branch pipe 32, the pressure gauge is provided with two injection hoses coming out of the Y-shaped branch pipe 32 Pressure control valves 34 are respectively coupled to the lower part of the pressure gauge 33 to control the pressure of the pressure gauge 33.

3 is a schematic diagram showing a step of performing pressure grouting on the inlet hole 21 after confirming that the clean injection material flows out of the outlet hole 22, and FIG. 4 is an inlet hole 21 after the step of FIG. Stop the pressure grouting of) and install the packer in the outlet hole 22, and simultaneously perform pressure grouting in both directions of the inlet hole 21 and the outlet hole 22, and press the pressure gauge during the pressure grouting. The pressure control valve is used to check the pressure and to perform pressure grouting. In this bidirectional pressure grouting method, the grouting pressure of the injection liquid can be adjusted through the pressure regulating valve, so that the work proceeds more efficiently than the general grouting work, and the work time is increased, thereby saving work time. It is effective.

In particular, the pressure control to the pressure control valve and the operation of the pressure grouting in both directions through the formation of a larger area of grouting has the effect of increasing the holding force of the pile tip.

5 is a grouting method using a bidirectional pressure tow grouting apparatus according to the present invention, the first step (S10) of attaching to a reinforcing bar and installing a sleeve for drilling; A second step (S20) of puncturing; A third step (S30) of removing foreign substances in the air by using the compressed air 13 or the fresh water 25 suction pump 70; Pressure gauges 33 are respectively coupled to the injection hose 30 branched into the Y-type branch pipe 32, and pressure control valves 34 are coupled to the lower ends of the pressure gauges 33, and the non-return valve 31 is A fourth step (S30) of installing the mounted packer 24; Performing a grouting of the inflow hole 21 to confirm that the injection material of the outflow hole 22 flows out (S40); It characterized in that it comprises a sixth step (S50) for adjusting the pressure with the pressure control valve 34, while performing the bidirectional pressure grouting in the inlet hole (21).

As mentioned above, although this invention demonstrated and demonstrated the preferred embodiment for demonstrating the principle of this invention, this invention is not limited to the structure and operation as it was shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

Figure 1 (a) is a schematic diagram of removing the slime using conventional compressed air, Figure 1 (b) is a schematic diagram of removing the slime using conventional fresh water, Figure 1 (c) is a conventional Figure 1 is a schematic diagram of the step of pressure grouting the injection hole of, Figure 1 (d) is a schematic diagram of the step of pressure grouting the outlet hole 22 to block the conventional injection hole.

Figure 2 is a schematic diagram of the step of removing using the air and the suction pump during removal of slime for grouting operation according to the present invention.

Figure 3 is a schematic diagram of the pressure grouting step in the injection hole after installing the Y-shaped branch pipe according to the present invention.

Figure 4 is a schematic diagram of the step of performing a bidirectional pressure grouting by adjusting the pressure using the Y-type branch pipe according to the present invention.

5 is a flow chart of a method of operation of bidirectional pressure tow grouting in accordance with the present invention.

<Code Description of Main Parts of Drawing>

10: pile part 11: cast-in-place pile

12: weathered rock 13: compressed air

14: groundwater 15: slime

16: slime eruption 20: inflow and outflow

21: inlet hole 22: outlet hole

23: Load 24: Packer

25: fresh water 26: injection material

30: injection hose 31: non-return valve

32: Y type branch pipe 33: pressure gauge

34: pressure control valve 40: inlet hole grouting area

50: conventional grouting area 60: enlarged grouting area

70: suction pump

Claims (4)

When crushing rock exists at the tip of pile during construction of cast-in-place pile or foreign matter such as slime and weathered residual soil remains, ground is loosened by vibration due to excavation, so settlement and deformation may occur due to upper load. In performing the toe grouting to the pile tip, Y-type branch pipe 32 is formed in the injection hose 30 of the injection material 26 for ease of adjustment of the injection pressure and grouting operation, and two injection hoses 30 coming out of the Y-type branch pipe 32. The pressure gauge 33 is coupled to each of the), and the pressure gauge 33 is lowered to adjust the pressure of the pressure gauge 33 provided with two injection hoses 30 coming out of the Y-shaped branch pipe 32. Two-way pressure tow grouting device is respectively coupled to the pressure control valve (34). The method of claim 1, Bi-directional pressure tow grouting device further comprises a packer (22) equipped with a non-return valve (31) to prevent the back flow of the injection material 26 injected through the injection hose (30). The method of claim 1, In order to remove foreign matters such as slime 15 or monolayer clay remaining to perform tow grouting, a suction pipe 71 is inserted into an inlet pipe 27 and a foreign material through the suction pipe 71 by the suction pump 70. Bidirectional pressure tow grouting device, characterized in that the removal. In the tow grouting method, A first step (S10) of attaching the reinforcing bar to install a sleeve for drilling; A second step (S20) of puncturing; A third step (S30) of removing foreign substances in the air by using the compressed air 13 or the fresh water 25 or the suction pump 70; Pressure gauges 33 are respectively coupled to the injection hose 30 branched into the Y-type branch pipe 32, and pressure control valves 34 are coupled to the lower ends of the pressure gauges 33, and the non-return valve 31 is A fourth step (S40) of installing the mounted packer 24; Performing a grouting of the inflow hole 21 to confirm that the injection material 26 of the outflow hole 22 flows out (S50); While performing the bidirectional pressure grouting to the inlet hole (21), the operation method of the bidirectional pressure tow grouting comprising a sixth step (S60) for adjusting the pressure with the pressure control valve (34).

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