KR20200011684A - Grouting method with steel pipe - Google Patents

Abstract

The present invention relates to a steel pipe grouting method comprising: a through hole formation step of forming a through hole on the ground; a steel pipe arrangement step of arranging a steel pipe in the through hole; a grouting preparation step of closing an inlet of the through hole by using a packer member and forming an injection pipe and a discharge pipe which pass through the packer member; and a grouting step of discharging air into the through hole via the discharge pipe while injecting a grout material into the through hole via the injection pipe. Accordingly, construction can be easily performed, and improved ground reinforcement effects can be provided.

Description

Grouting method with steel pipe

The present invention relates to a steel pipe grouting method, and more particularly to a steel pipe grouting method that can be easily constructed and exhibits excellent ground reinforcing effects.

Underground structures such as tunnels are effective in improving land utilization, solving traffic problems, and improving urban aesthetics, but they can affect the surrounding ground and cause structural problems if the ground is not firmly supported.

When constructing underground structures, if the strength of the ground is not sufficient or the surrounding structures can be affected by the ground loosening due to the excavation of the ground, it is necessary to reinforce the ground along with the construction of the underground structure itself.

As a related art for reinforcing the ground, there is, for example, the 'non-seal grouting method using a double packer grouting device' No. 10-1541718. The conventional grouting method comprises the steps of: i) forming a drilled hole in the ground; ii) inserting a steel pipe into the drilled hole; and iii) inserting a bundle of injection tubes, an inner packer and an outer packer into the steel pipe. (Iv) injecting an expanding agent into the inner packer and the outer packer spaced apart on the length of the steel pipe to partition the space in the drilling hole and the space in the steel pipe into a plurality of compartments; And simultaneously injecting grout material into each of the deletions, and iii) removing the bundle of injection tubes from the steel pipe.

As such, the method of reinforcing the ground by forming a plurality of compartments in the space in the perforation hole and the space in the steel pipe and injecting grout material into each compartment can reliably reinforce the ground, but in order to form a plurality of compartments And a plurality of injection pipes are required to inject grout material into each compartment, and thus a plurality of members are used for the application of the method, and it is not easy to install each packer and the injection pipe at a predetermined position in the steel pipe.

KR 10-1541718 B1

The present invention is to solve the problems of the prior art as described above, does not require a large number of members for the application of the steel pipe grouting method, and thus the object to provide a steel pipe grouting method that can facilitate the construction have.

At the same time, to provide a steel pipe grouting method that can exhibit the effect of excellent ground reinforcement.

According to a preferred embodiment of the present invention for solving the problems as described above, forming a punching hole in the ground; Steel pipe arrangement step of placing a steel pipe in the drilling hole; A grouting preparation step of closing an inlet of the perforation hole with a packer member and forming an injection tube and an outlet tube passing through the packer member; And a grouting step of discharging air in the drilling hole through the discharge pipe while injecting the grout material into the drilling hole through the injection pipe.

According to another embodiment of the present invention, the grouting step, the first injection step of injecting the grout material at low pressure into the drilling hole through the injection pipe; A discharge pipe closing step of closing the discharge pipe when the grout material flows backward through the discharge pipe; And a second injection step of injecting the grout material at high pressure into the drilling hole through the injection pipe.

According to another embodiment of the present invention, the discharge pipe is provided with a steel pipe grouting method characterized in that extends through the packer member to the front end of the space in the steel pipe.

According to another embodiment of the present invention, a steel pipe grouting method is provided, characterized in that a plurality of through holes are formed on the wall surface of the steel pipe.

According to another embodiment of the present invention, the steel pipe is provided with a blocking plate for closing the end of the steel pipe and the front end valve is formed when the pressure is above a certain pressure, and the packer member in the grouting preparation step It is formed to be in close contact with the rear end of the steel pipe, the grouting step is provided with a steel pipe grouting method characterized in that the injection of the grout material into the space between the steel pipe outer surface and the inner surface of the hole through the injection pipe.

According to another embodiment of the present invention, the packer member has an outer packer member having a fixing hole in the center to fix the steel pipe to the fixing hole and an inner packer member for closing the tip of the steel pipe. A steel pipe grouting method is provided.

According to another embodiment of the present invention, a steel pipe grouting method is provided, characterized in that a plurality of fixing projections are formed at intervals along the inner circumferential surface of the fixing hole.

According to another embodiment of the present invention, the rear end of the discharge pipe is provided with a steel pipe grouting method, characterized in that the rear end valve which is opened when a predetermined pressure or more is formed.

According to another embodiment of the present invention, after the grouting step, a packer member removing step of removing the packer member; and a mortar pouring step of pouring mortar on the portion from which the packer member is removed; A steel pipe grouting method is provided.

According to another embodiment of the present invention, the packer member is made of an elastic material, and in the grouting preparation step, the packer member is pressed so that the packer member is in close contact with the inner surface of the drilling hole. A grouting method is provided.

According to another embodiment of the present invention, the packer member is made of a film-like member having a space therein, and in the grouting preparation step by injecting fluid into the inner space of the packer member to expand the packer member Provided is a steel pipe grouting method characterized in that the packer member is in close contact with the inner surface of the drilling hole.

According to another embodiment of the present invention, after the grouting step, a steel pipe grouting method is provided, characterized in that the pipe removing step of removing the injection pipe and the discharge pipe further proceeds.

According to the steel pipe grouting method of the present invention, since many members are not required to apply the method, it is possible to proceed economically and easily.

And since the air in the hole can be reliably discharged, the space in the hole can be tightly filled with the grout material, and the hardened grout material and the steel pipe can effectively reinforce the ground.

When the steel pipe used in applying this invention is equipped with a front valve etc., operation | work can be made easier.

Further, after the grouting step, the packer member may be removed to recycle the members used in the process, and the mortar may be poured in the space formed by removing the packer member, thereby reliably closing the perforated hole. When the fixing member is further provided with the packer member, the groove formed by the fixing protrusion while removing the packer member may improve the integrity of the grout member and the mortar.

1 is a flow chart of the steel pipe grouting method according to the present invention,
2 is an explanatory diagram for each step of the steel pipe grouting method according to the present invention,
3 is a step-by-step explanatory diagram of a steel pipe grouting method according to a second embodiment of the present invention,
4 is an explanatory diagram of a packer member in a steel pipe grouting method according to a second embodiment of the present invention;
5 is an explanatory view of a case in which the packer member includes a fixing protrusion;
Figure 6 is an explanatory diagram for the case of further proceeding the packer member removal step and mortar casting step in the steel pipe grouting method according to the present invention.

Hereinafter, with reference to the accompanying drawings an embodiment of the present invention will be described in detail. However, in describing the present invention, when the technical concept of the present invention is obscured or obscured by describing the known configuration in detail, the description of the known configuration will be omitted.

Steel pipe grouting method according to the present invention comprises a large hole forming step (S10), steel pipe arrangement step (S20), grouting preparation step (S30) and grouting step (S40).

1 is a flow chart of a steel pipe grouting method according to the present invention, Figure 2 is a step-by-step explanatory diagram of a steel pipe grouting method according to the present invention.

In the drilling hole forming step (S10), as shown in FIG. 2A, the drilling hole 10 is formed in the ground to be reinforced. The diameter of the drilling hole 10 is formed of 100 ~ 150mm, the length of the drilling hole 10 is formed of 10 ~ 15m.

In the steel pipe arrangement step (S20), as shown in (b) of FIG. 2, the steel pipe 20 is disposed in the drilling hole 10 formed in the drilling hole forming step (S10). The diameter of the steel pipe 20 may be made of 50 ~ 114mm. Spacers (not shown) may be provided on the front and outer surfaces of the steel pipe 20 so that the steel pipe 20 may be spaced apart from the inner surface of the drilling hole 10.

In the grouting preparation step (S30), as shown in FIG. 2C, the packer member 30 is inserted into the inlet of the drilling hole 10, that is, the rear end of the drilling hole 10 to drill the drilling hole 10. ), Each of which penetrates the packer member 30 so that one end is located outside the drilling hole 10 and the other end is located inside the drilling hole 10. To form.

In the grouting step (S40), as shown in (d) to (f) of FIG. 2, the grout material 60 is injected into the drilling hole 10 through the injection pipe 40. The air filled in the drilling hole 10 before the grout material 60 is filled in the drilling hole 10 through the discharge pipes 50 and 50 as the grout material 60 is filled in the drilling hole 10. Discharged.

According to the steel pipe grouting method of the present invention, the packer member 30 is formed only at the rear end of the punching hole 10 so that the space in the punching hole 10 is formed in one section without being divided into sections on the length of one injection tube ( The grout material 60 may be injected into the drilling hole 10 using the 40. Accordingly, many members are not required for the progress of the steel pipe grouting method, and the steel pipe grouting method can be easily applied.

At the same time, since the air in the drilling hole 10 can be discharged through the discharge pipe 50, the space in the drilling hole 10 can be tightly filled with the grout material 60, and the cured grout material 60 and Steel pipe 20 can effectively reinforce the ground.

In one embodiment of the present invention, the grouting step (S40) may be made to include more specifically the first injection step (S41), the discharge pipe closing step (S42) and the second injection step (S43).

In the first injection step (S41), as shown in FIG. 2 (d), the grout material 60 is injected at a low pressure into the drilling hole 10 through the injection pipe 40. Low pressure is a pressure enough to transfer the grout material 60 through the injection pipe 40 having a specific diameter. The primary injection step S41 is performed until the space in the drilling hole 10 is filled with the grout material 60.

As the space in the drilling hole 10 is filled with the grout material 60, the air filled in the drilling hole 10 is discharged through the discharge pipe 50, and the space in the drilling hole 10 is filled with all the grout material 60. The grout material 60 flows back through the ground discharge pipe 50. When it is confirmed that the grout material 60 flows backward, the discharge pipe 50 is closed as shown in FIG. 2E, and the discharge pipe closing step S42 is performed.

In the second injection step (S43), the grout material 60 is injected into the drilling hole 10 through the injection pipe 40, and the grout material 60 is injected at a high pressure, for example, a pressure of 15 to 45 kg. When the second injection step (S43) is performed, the pressure applied to the inner surface of the hole 10 by the grout material 60 increases, so that the grout material 60 is drilled as shown in FIG. More deeply penetrates into the ground around the hole 10. Accordingly, the ground is more firmly reinforced by the steel pipe grouting method of the present invention.

As in the above embodiment, when the grouting step S40 includes the first injection step S41, the discharge pipe closing step S42, and the second injection step S43, the packer member (in the grouting preparation step S30). Discharge pipe 50 disposed through the 30 is preferably extended to the front end of the space in the steel pipe (20).

The perforated hole 10 may be formed higher than the rear end, and in this case, the grout material 60 injected into the perforated hole 10 through the injection tube 40 may be formed from the rear end of the perforated hole 10. The air that is filled and pushed by the grout material 60 moves to the tip end side of the drilling hole 10.

When the discharge pipe 50 extends to the front end of the space in the steel pipe 20, the air moved to the front end of the drilling hole 10 can escape through the discharge pipe (50).

When the grouting step S40 includes the first injection step S41, the discharge pipe closing step S42, and the second injection step S43, a plurality of through holes 21 are formed on the wall surface of the steel pipe 20. Can be.

The through hole 21 allows the grout material 60 to move to the outer space of the steel pipe 20 when the grout material 60 is first filled in the steel pipe 20, and moves to the inner space of the steel pipe 20 when the grout material 60 is first filled in the outer space of the steel pipe 20. The space in the drilling hole 10 including the inner space of the steel pipe 20 is filled with the grout material 60 so as to be able to make it possible.

3 is a step-by-step explanatory diagram of a steel pipe grouting method according to a second embodiment of the present invention. While describing another embodiment of the present invention, a detailed description of parts overlapping with the embodiment of the present invention will be omitted.

In the second embodiment of the present invention, as shown in FIG. 3B, the steel pipe 20 further includes a blocking plate 22 and a tip valve 23. The blocking plate 22 is formed to close the tip of the steel pipe 20, and the tip valve 23 is formed in the blocking plate 22 to be above a predetermined value from the outside of the steel pipe 20 into the steel pipe 20. It may open when pressure is applied.

In the second embodiment of the present invention also in the grouting preparation step (S30), as shown in Figure 3 (c), the packer member 30 is formed to be in close contact with the rear end of the steel pipe 20 to the steel pipe 20 In the front end space is closed by the blocking plate 22, the rear end is closed by the packer member (30). Accordingly, the space in the steel pipe 20 does not communicate with the space outside the steel pipe 20 except when the front valve 23 is opened.

In the grouting step (S40), the grout material 60 is injected into the space between the outer surface of the steel pipe 20 and the inner surface of the drilling hole 10 through the injection tube 40. The grout material 60 is injected at a pressure exceeding the pressure that can open the front end valve 23. Then, at the beginning of the grouting step S40, the grout material 60 is first filled in the space between the outer surface of the steel pipe 20 and the inner surface of the drilling hole 10, as shown in FIG. (20) When the grout material 60 is completely filled in the space between the outer surface and the inner hole 10, the steel tube 20 outer surface and the hole 10 as shown in (e) of FIG. The grout material 60 is also filled in the steel pipe 20 by opening the front end valve 23 while increasing the pressure of the grout material 60 filled in the space between the inner surfaces. When the grout material 60 is completely filled in the steel pipe 20, the grout material 60 flows back out of the packer member 30 through the discharge pipe 50 as illustrated in FIG. do.

According to the steel pipe grouting method of the second embodiment, the front end valve 23 is opened when the pressure is equal to or higher than a predetermined pressure, so that the grout is spaced in the space between the outer side of the steel pipe 20 and the inner side of the punched hole 10 until the front end valve 23 is opened. The ash 60 is tightly filled and the grout material 60 may penetrate to the ground around the perforation hole 10. In addition, the grout material 60 completely flows into the space between the outer surface of the steel pipe 20 and the inner surface of the drilling hole 10 and the space within the steel pipe 20 through the back flow of the grout material 60 to the discharge pipe 50. You can see that it is filled.

In the steel pipe grouting method according to the second embodiment of the present invention, as shown in FIG. 4, the packer member 30 may include an outer packer member 31 and an inner packer member 32.

The outer packer member 31 is provided with a fixing hole 31a at the center so that the steel pipe 20 is fixed to the fixing hole 31a to provide a space between the outer surface of the steel pipe 20 and the inner surface of the perforation hole 10. It is closed to maintain a constant distance between the outer surface of the steel pipe 20 and the inner surface of the drilling hole (10).

The inner packer member 32 closes the tip of the steel pipe 20 so that the grout material 60 may be tightly filled in the space in the steel pipe 20.

Along the inner circumferential surface of the fixing hole 31a in the outer packer member 31, as shown in FIG. 5, it is preferable that a plurality of fixing protrusions 31b are formed at intervals.

The fixing protrusion 31b is locally pressed to the outer surface of the steel pipe 20 when the steel pipe 20 is fitted into the fixing hole 31a so that the steel pipe 20 and the outer packer member 31 can be in close contact with each other. do.

In the steel pipe grouting method according to the second embodiment of the present invention, a rear end valve 51 may be formed at the rear end of the discharge pipe 50.

The rear valve 51 is opened when a predetermined value or more is applied to the outside of the steel pipe 20 from the inside of the steel pipe 20, it is preferable to open at a pressure lower than the pressure that the front valve 23 is opened.

When the rear end valve 51 is formed at the rear end of the discharge pipe 50, the grout material 60 is filled in the space in the steel pipe 20 until the grout material 60 reaches a constant pressure, and then the grout material 60 flows backward in the steel pipe 20. Therefore, the grout material 60 may be tightly filled in the steel pipe 20.

After the grouting step S40, the packer member removing step and the mortar pouring step may be further performed.

The packer member removal step is performed in a state where there is little fluidity of the grout material 60 after about 24 hours after the grouting step (S40), the packer member removal step shown in Figure 6 (a) As described above, the packer member 30 closing the punching hole 10 is removed. In the packer member removal step, the grout material 60 is not completely hardened, but there is little fluidity, so that the grout material 60 may remain filled in the punched hole 10.

The packer member 30 removed in the packer member removal step may be recycled. In order to easily remove the packer member 30, the injection tube 40 and the discharge tube 50 is preferably made detachable with respect to the packer member (30).

In the mortar pouring step, as shown in FIG. 6B, the mortar 70 is poured into a portion where the packer member 30 is removed. Accordingly, it is possible to completely close the rear end of the hollow hole 10 by removing the packer member 30.

When the packer member 30 includes the outer packer member 31 and the inner packer member 32 and the outer packer member 31 includes the fixing protrusion 31b, the fixing protrusion when the packer member 30 is removed. Grooves are formed in the portion where 31b is located. These grooves are filled with mortar 70 that is poured in the mortar pouring step, which may contribute to improving the integrity of the grout material 60 and the mortar 70 that are poured at a time difference. That is, the mortar 70 filled in the groove serves as a shear key.

The grout material 60 and mortar 70 may be composed of the same or similar materials.

After the grouting step S40, in addition to the packer member removing step, a pipe removing step of removing the injection tube 40 and the discharge pipe 50 may be further performed.

The injection tube 40 and the discharge tube 50 removed in the tube removal step may be recycled.

The tube removal step is preferably performed before the grout material 60 is completely cured so that the injection pipe 40 and the discharge pipe 50 can be easily removed.

The packer member 30 may be made of an elastic material such as rubber or silicon. In this case, in the grouting preparation step (S30), the packer member 30 is inserted into the rear end of the drilling hole 10, and then the packer member 30 is compressed to increase the diameter of the packer member 30. 30 may be in close contact with the inner surface of the drilling hole (10). The packer member 30 in close contact with the inner surface of the drilling hole 10 closes the inlet of the drilling hole 10.

The force for compressing the packer member 30 may be applied by the hydraulic jack.

Alternatively, the packer member 30 may be formed of a film-shaped member having a space therein. In this case, after the packer member 30 is disposed at the rear end of the drilling hole 10 in the grouting preparation step (S30), the packer member 30 is expanded by injecting fluid into the inner space of the packer member 30 to expand the packer member 30. The member 30 may be in close contact with the inner side surface of the drilling hole 10.

In order to inject fluid into the packer member 30, the packer member 30 is preferably provided with a tube communicating with the inner space of the packer member 30.

In the above description, the present invention has been described in detail with reference to the accompanying drawings. However, since the embodiments are merely examples for easy understanding of the present invention, those skilled in the art will appreciate It will be apparent that various modifications can be made within the scope of the technical idea. Therefore, such modifications will be described within the scope of the present invention as described in the claims.

S10: drilling hole forming step S20: steel pipe arrangement step
S30: grouting preparation step S40: grouting step
S41: first injection step S42: discharge pipe closing step
S43: second injection step
10: drilling hole 20: steel pipe
21: through hole 22: blocking plate
23: tip valve 30: packer member
31: outer packer member 31a: fixing hole
31b: fixing protrusion 32: inner packer member
40: injection pipe 50: discharge pipe
51: rear end valve 60: grout material
70: mortar

Claims (12)

A punching hole forming step of forming a punching hole in the ground;
Steel pipe arrangement step of placing a steel pipe in the drilling hole;
A grouting preparation step of closing an inlet of the perforation hole with a packer member and forming an injection tube and an outlet tube passing through the packer member; And
And a grouting step of discharging the air in the drilling hole through the discharge pipe while injecting the grout material into the drilling hole through the injection pipe.
The method of claim 1,
The grouting step,
A first injection step of injecting grout material at low pressure into the drilling hole through the injection pipe;
A discharge pipe closing step of closing the discharge pipe when the grout material flows backward through the discharge pipe; And
And a second injection step of injecting grout material at high pressure into the drilling hole through the injection pipe.
The method of claim 2,
The discharge pipe is a steel pipe grouting method, characterized in that extending through the packer member to the leading end of the space in the steel pipe.
The method of claim 2,
Steel pipe grouting method characterized in that a plurality of through holes are formed on the wall surface of the steel pipe.
The method of claim 1,
The steel pipe is provided with a blocking plate for closing the tip of the steel pipe and the front end valve is formed when the pressure is above a certain pressure,
In the grouting preparation step, the packer member is formed to be in close contact with the rear end of the steel pipe,
The grouting step of the steel pipe grouting method, characterized in that for injecting grout material into the space between the steel pipe outer surface and the inner surface of the hole through the injection pipe.
The method of claim 5,
The packer member is provided with a fixing hole in the center of the steel pipe grouting method comprising an outer packer member for fixing the steel pipe to the fixing hole and an inner packer member for closing the tip of the steel pipe.
The method of claim 6,
Steel grouting method characterized in that a plurality of fixing projections are formed at intervals along the inner circumference of the fixing hole.
The method of claim 5,
The rear end of the discharge pipe is a steel pipe grouting method, characterized in that the rear end valve is formed when the pressure is above a predetermined pressure.
The method of claim 1,
After the grouting step,
A packer member removing step of removing the packer member; and
Steel mortar grouting method characterized in that further; the mortar pouring step of placing the mortar on the portion in which the packer member is removed.
The method of claim 1,
The packer member is made of an elastic material,
In the grouting preparation step, the packer member is compressed so that the packer member is in close contact with the inner surface of the drilling hole.
The method of claim 1,
The packer member is made of a film-like member having a space therein,
In the grouting preparation step, by injecting a fluid into the inner space of the packer member to expand the packer member to ensure that the packer member is in close contact with the inner surface of the drilling hole.
The method of claim 1,
After the grouting step,
Steel pipe grouting method characterized in that the pipe removal step of removing the injection pipe and the discharge pipe further proceeds.

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