KR102229640B1 - Construction method of steel pipe reinforcing system by simultaneous grouting without sealing - Google Patents

Abstract

The present invention relates to a method of constructing a steel pipe reinforcement system with sealing-less simultaneous injection, capable of simultaneously injecting a grout material into a steel pipe by connecting an injection hose to each of a plurality of space parts divided by a partition disc, thereby enabling the grout material to be directly injected without the injection of a sealing material, and solving an injection blind spot. According to the present invention, the method comprises the following steps of: (a) expanding a water-expandable water stop material of a partition disc by soaking a reinforcement unit inserting the partition disc and an injection hose into a steel pipe, in water, thereby pre-manufacturing the reinforcement unit such that the partition disc is fixed in the steel pipe; (b) inserting the reinforcement unit into a drilling hole formed on the ground; (c) connecting an injection pump to each injection hose; and (d) simultaneously injecting a grout material into each space part in the steel pipe divided by the partition disc by operating the injection pump, and leading the grout material to be discharged to the outside of the steel pipe through injection holes of the steel pipe.

Description

Construction method of steel pipe reinforcing system by simultaneous grouting without sealing}

In the present invention, the grout material can be simultaneously injected into the steel pipe by connecting injection hoses to a plurality of spaces partitioned by the partition disk, so that the grout material can be injected immediately without injection of the sealing material, and the injection blind spot can be eliminated. It is about the construction method of a sealing-free simultaneous injection steel pipe reinforcement system.

When constructing a tunnel, a steel pipe grouting method is used to reinforce the tunnel excavation surface prior to the tunnel excavation in order to prevent falling off and overbreak of the tunnel excavation surface (FIG. 1).

In the steel pipe grouting method, a plurality of perforated holes 11 are formed along the tunnel excavation line before tunnel excavation, and the steel pipe 30 is inserted and installed, and the steel pipe 30 is inside and outside the steel pipe 30 through the injection hose 50 inside the steel pipe 30. The grout material (G) is injected under high pressure to integrate the steel pipe (30) and the ground. Accordingly, the safety of the curtain is secured by dispersing and reducing the overhead load and earth pressure applied to the tunnel. At this time, the steel pipe is constructed to be inclined upward.

However, even if the grout material is injected into the steel pipe at high pressure, if the space between the steel pipe and the hollow wall is large, the injection pressure decreases and the grouting effect in the ground decreases.

Therefore, after the steel pipe is inserted, a sealing material (SL) such as bentonite is injected into the injection hose between the steel pipe and the hollow wall in order to close the space between the hole wall and the steel pipe and prevent collapse of the hole wall. This maintains the injection pressure of the grout material and prevents backflow.

The grout material is injected under high pressure to penetrate into and fill the rock joint through a small gap in the sealing material outside the steel pipe.

However, the sealing material may take about 24 hours to harden, resulting in air delay. Therefore, there are many cases where the sealing material is omitted and the grout material is injected immediately, so that the grout material is not tightly filled in many cases.

In addition, if the solidification strength of the sealing material is too high, the grout material cannot spread widely, and thus the grout material must be injected before the sealing material is completely solidified. However, in this case, the grout material cannot express its original strength. The grout material begins to be filled from the tip of the steel pipe, and the sealing material closes the joint inlet to be filled afterwards, so that the injection into the joint is not properly performed, so that the grouting effect is inferior.

In addition, the sealing material has to expand in volume and tightly fill the space between the steel pipe and the empty wall. However, depending on the actual formulation, there may be a problem in that the sealing material is not properly expanded or the steel pipe is not properly sealed due to material separation.

Accordingly, as shown in FIG. 2, a multi-stage injection method has been developed in which the grout material can be directly injected without pre-injecting the sealing material. The multi-stage injection method includes a packer 40 made of geotextiles, etc. inside the steel pipe 30, and a portion of the inside of the steel pipe 30 is closed with a packer 40 to inject a grout material in a limited space. Keep the injection pressure constant.

In the above technology, after injecting a grout material into a part of the space, while moving the packer body, the grout material is sequentially injected into the next space.

However, in order to move the packer, it is cumbersome to repeat the process of filling the packer with an injection material, expanding and fixing it in the steel pipe, and re-contracting and moving the packer. In addition, since the grout material is sequentially injected in multiple stages for each section, it takes a lot of injection time. In addition, the rear end of the portion where the grout material is pre-injected is clogged with the injection hole, which makes it difficult to smoothly spray the grout material, so there is a concern that a blind spot for injection may occur.

In addition, as in Registration Patent No. 10-0918681, a grout material is simultaneously injected into each space partitioned by the packer body using a U-shaped injection pipe positioned to penetrate a plurality of packer bodies spaced apart from each other inside the steel pipe. There is a multi-stage simultaneous injection method.

However, in the above registration technology, the space is also partitioned by a tubular packer body that is expanded by injection of an injection material. Therefore, at the position of the packer, the grout material is not smoothly injected outside the steel pipe due to interference with the packer body, so there is a limit to even injection, and the injection hole is often closed due to reverse flow of the injection material, damage to the packer body, etc. In addition, since the grout material is collectively injected by a single steel pipe, there is a problem that the injection pressure decreases as the distance from the injection pump increases. In addition, the packer is expensive, it is difficult to apply to small-diameter steel pipes, and there is a limit to securing the internal fixing force of the steel pipe.

In order to solve the above problems, the present invention provides a method of constructing a sealing-free simultaneous injection steel pipe reinforcement system capable of simultaneously injecting grout material into a plurality of spaces partitioned inside a steel pipe, and thus directly injecting grout material without injection of a sealing material. I want to provide.

An object of the present invention is to provide a method of constructing a non-sealing simultaneous injection steel pipe reinforcement system capable of eliminating the blind spot of grout material injection.

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The present invention according to a preferred embodiment is a steel pipe in which a plurality of injection holes are formed on an outer circumferential surface by being inserted into a perforation hole formed in the ground, and a through hole is formed by dividing the inside of the steel pipe into a plurality of spaces by being provided to be spaced apart from each other in the steel pipe, The outer circumferential surface is composed of a disk body having a groove portion and a water expansion index material provided so that an inner portion is inserted into the groove portion formed on the outer circumferential surface of the disk body, and the outer portion protrudes to the outside of the disk body to surround the outer circumferential surface in a ring shape or spiral shape. A reinforcing unit comprising a plurality of partition disks and a plurality of injection hoses provided in the steel pipe through the through-holes of the partition disks and having a front end provided inside each space portion to inject grout material for each space portion; An injection pump for pumping grout material to each of the injection hoses; And an injection plant supplying grout material to the injection pump. This is to construct a non-sealing, simultaneous injection steel pipe reinforcement system consisting of (a) the bulkhead disk is expanded by expanding the water expansion index material of the bulkhead disk by immersing the reinforcing unit in which the bulkhead disk and the injection hose are inserted inside the steel pipe. Pre-fabricating a reinforcing unit to be fixed therein; (b) inserting the reinforcing unit into a hole formed in the ground; (c) connecting an injection pump to each of the injection hoses; And (d) operating the injection pump to simultaneously inject grout material into each space inside the steel pipe partitioned by the partition disk, and to discharge the grout material to the outside of the steel pipe through the injection hole of the steel pipe. It provides a construction method of a sealing-free simultaneous injection steel pipe reinforcement system, characterized in that consisting of.

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In the present invention according to another preferred embodiment, a tip packer is provided outside the front end of the steel pipe, and a tip injection hole communicating with the inside of the tip packer is formed on the outer circumference of the front end of the steel pipe. Provides a method of constructing a non-sealing simultaneous injection steel pipe reinforcement system, characterized in that the grout material injected into the space is introduced into the inside of the tip packer through the tip injection hole, and the tip packer is expanded.

According to the present invention as described above, the inside of the steel pipe is divided into a plurality of spaces having a predetermined volume by a plurality of partition disks provided to be spaced apart from each other in the steel pipe, and the grout material is simultaneously injected for each space using a plurality of injection hoses. can do.

Accordingly, it is possible to simultaneously inject the grout material into the plurality of divided steel pipes, and to eliminate the injection blind spot.

In addition, since each space is an independent space and has no influence on other spaces, the grout material can be injected with a uniform injection pressure.

In addition, since the grout material is simultaneously injected in multiple stages, a separate sealing material filling process is omitted, thereby shortening the construction period and reducing the construction cost.

Furthermore, unlike the tube-type packer, since a thin-walled disc is used, there is no need for a packer hose to expand the packer, and the expansion process of the packer can be omitted, enabling rapid construction.

1 is a view showing a conventional steel pipe reinforcement method of a tunnel excavation surface.
2 is a diagram showing a conventional multi-stage injection method.
3 is a diagram showing a sealingless simultaneous injection steel pipe reinforcement system.
Fig. 4 is a perspective view showing an embodiment of a partition wall disk.
5 is a perspective view showing another embodiment of the partition wall disk.
6 is a cross-sectional view showing an embodiment of a partition wall disk.
7 is a view showing an embodiment provided with a tip packer.
8 to 11 are views showing a step-by-step process for a construction method of a sealingless simultaneous injection steel pipe reinforcement system according to an embodiment.
12 and 13 are views showing a process for a construction method of a sealingless simultaneous injection steel pipe reinforcement system according to another embodiment.
14 is a view showing a reinforcing unit immersed in a water tank.

Hereinafter, the present invention will be described in detail according to the accompanying drawings and preferred embodiments.

3 is a diagram showing a sealingless simultaneous injection steel pipe reinforcement system.

As shown in FIG. 3 and the like, the sealing-free simultaneous injection steel pipe reinforcement system is inserted into the perforated hole 11 formed in the ground 1, and has a plurality of injection holes 31 formed on the outer circumferential surface of the steel pipe 3, the steel pipe ( 3) A plurality of partition wall disks (4) that are provided to be spaced apart from each other within the steel pipe (3) to partition the interior of the steel pipe (3) into a plurality of spaces (S), and the partition wall disk (4) provided inside the steel pipe (3). A reinforcing unit 2 comprising a plurality of injection hoses 5, each of which has a front end provided inside each of the spaces S and injecting the grout material G for each space S; An injection pump 6 for pumping the grout material G to each of the injection hoses 5; And an injection plant 7 for supplying grout material G to the injection pump 6; It characterized in that it consists of.

In the present invention, the grout material (G) can be simultaneously injected into a plurality of spaces (S) partitioned inside the steel pipe (3), so that the grout material (G) can be directly injected without injecting the sealing material, and the grout material (G It is to provide a construction method of a non-sealing simultaneous injection steel pipe reinforcement system that can eliminate the injection blind spot of ).

The sealing-free simultaneous injection steel pipe reinforcement system includes a reinforcement unit 2, an injection pump 6, and an injection plant 7.

The reinforcing unit (2) is composed of a steel pipe (3), a partition disk (4) and an injection hose (5).

The steel pipe 3 is inserted into the perforated hole 11 formed in the ground 1, and a plurality of injection holes 31 are formed on the outer circumferential surface.

In the case of reinforcing the tunnel excavation surface during tunnel construction, a plurality of perforated holes 11 are formed along the tunnel excavation line.

The perforated hole 11 is usually formed to be inclined upward.

The steel pipe 3 is a main reinforcing material that is inserted into the perforated hole 11 to reinforce the ground 1 around the excavation surface, and a structural carbon steel pipe may be used.

A plurality of spray holes 31 for spraying the grout material G injected from the inside of the steel pipe 3 into the outside of the steel pipe 3 are formed on the outer circumferential surface of the steel pipe 3.

A plurality of partition disks 4 are provided in the steel pipe 3 so as to be spaced apart from each other.

The partition disk 4 divides the inside of the steel pipe 3 into a plurality of spaces S having a predetermined volume by closing the steel pipe 3.

Unlike the conventional tubular packer, the partition wall disk 4 can be formed in a disk shape having a relatively thin thickness.

Therefore, a separate packer hose for expansion of the packer is not required, and the expansion process of the packer can be omitted, enabling rapid construction.

The injection hose 5 is installed to inject the grout material G into the steel pipe 3.

The injection hose 5 is provided through the partition wall disk 4 and is provided as many as the number of space portions S partitioned by the partition wall disk 4.

The injection hose 5 has a front end provided inside each of the spaces S to inject the grout material G for each of the spaces S.

Accordingly, the grout material (G) is injected into each space (S) inside the steel pipe (3) by a separate injection hose (5), so that the grout material (G) is simultaneously injected into the plurality of spaces (S). It can be injected in batches. In addition, when the grout material G is injected, since there is no influence of the other space portion S, it is possible to inject the grout material G with a uniform injection pressure.

That is, each injection hose 5 is connected to the injection pump 6 so that the grout material G can be simultaneously injected into each space S independently.

The grout material (G) filled in the inner space (S) of the steel pipe (3) by the injection hose (5) is sprayed to the outside of the steel pipe (3) through the injection hole (31) formed on the outer circumferential surface of the steel pipe (3). It is filled by penetrating into the joint of the ground (1).

A cap 32 for closing the steel pipe 3 may be inserted at the rear end of the steel pipe 3, that is, at the inlet side of the perforated hole 11. The cap 32 prevents the grout material G from flowing out of the steel pipe 3.

Between the outside of the steel pipe 3 and the inlet of the perforated hole 11 may be closed with a caulking material 33 so that the injection pressure of the injection material is maintained.

According to the present invention, since the grout material (G) is simultaneously injected in multiple stages, a separate sealing material filling process is omitted, thereby shortening the construction period and reducing the construction cost. In addition, it is possible to eliminate the injection blind spot.

The present invention is applicable not only to the tunnel excavation surface, but also to general ground reinforcement such as slope reinforcement and excavation surface reinforcement.

Fig. 4 is a perspective view showing an embodiment of the partition wall disk, and Fig. 5 is a perspective view showing another embodiment of the partition wall disk.

4 and 5, the partition wall disk 4 surrounds the disk body 41 and the outer circumferential surface of the disk body 41 through which the through hole 411 through which the injection hose 5 penetrates is formed. It may be composed of a water expansion water-stop material 42 provided so as to be.

In order to insert and fix the partition disk 4 inside the steel pipe 3, the outer diameter of the partition disk 4 should be smaller than the inner diameter of the steel pipe 3 when inserted, and be larger than the inner diameter of the steel pipe 3 after insertion. do.

To this end, the partition wall disk 4 may be configured by coupling a water expansion index member 42 to the outside of the disk main body 41 in the shape of a disk.

The water expansion index member 42 is configured to surround the outer peripheral surface of the disk main body 41.

The water-expansion water-stop material 42 is for preventing leakage of the concrete structure and maintaining semi-permanent water-repellency, and may be made of a modified rubber combining rubber and a hydrophilic polymer as a main component.

The water expansion index member 42 expands itself when it comes into contact with water or moisture and increases in volume, and the partition wall disk 4 is fixed inside the steel pipe 3 by the nature of the water expansion index member 42. .

The partition wall disk 4 can be constructed through the following process.

First, the injection hose 5 is coupled through the through hole 411 formed in the disk body 41. And after supplying enough water to the water expansion index member 42 to induce the expansion of the water expansion index member 42, the partition wall disk 4 to which the injection hose 5 is coupled is inserted into the steel pipe 3 Combine.

Then, the water expansion index member 42 gradually expands inside the steel pipe 3 and comes into close contact with the inner wall surface of the steel pipe 3, so that the partition wall disk 4 is firmly fixed inside the steel pipe 3.

The water-expansion index material 42 may exhibit excellent fixing power due to its high adhesiveness upon expansion.

Conventional packers not only require a large pressure for expansion, but it is difficult to maintain the expansion pressure, and when the internal pressure decreases, the fixing force rapidly decreases. In contrast, the water-expansion index member 42 can easily adjust the expansion rate and the expansion rate, as well as maintain a constant expansion state, so that a stable fixing force can be exhibited.

When the grout material G is injected, the water expansion index material 42 may be continuously maintained in an expanded state due to moisture in the grout material G itself.

The water expansion index member 42 may be formed in consideration of the inner diameter of the steel pipe 3, the injection pressure of the grout material G, the spacing of the partition wall disk 4, and the like.

The water expansion waterstop material 42 may be configured to surround the outside of the disk main body 41 in a ring shape as shown in FIG. 4 or in a spiral shape as shown in FIG. 5.

6 is a cross-sectional view showing an embodiment of a partition wall disk.

6, a groove 412 is formed on the outer circumferential surface of the disk main body 41, and the water expansion index member 42 is inside the groove 412 formed on the outer circumferential surface of the disk main body 41. The inner part is inserted and the outer part protrudes to the outside of the disk main body 41 so as to surround the outer circumferential surface in a ring shape or a spiral shape.

When the water-expansion water-stop material 42 is inserted into the groove 412 formed on the outer circumferential surface of the disk body 41, the coupling between the disk body 41 and the water-expansion water-stop material 42 can be firmly maintained. In addition, while the partition wall disk 4 is fixed inside the steel pipe 3, the disk body 41 is pushed due to the injection pressure of the grout material G, so that the disk body 41 and the water expansion index member 42 It can prevent separation.

Accordingly, when the partition wall disk 4 is handled, the water expansion water-stop material 42 can be prevented from being separated from the disk main body 41. In addition, even if the grout material G is injected with a strong pressure, the position of the disk main body 41 inside the steel pipe 3 is stably fixed.

7 is a view showing an embodiment provided with a tip packer.

As shown in FIG. 7, a tip packer 34 may be provided outside the front end of the steel pipe 3.

It may be difficult to maintain the pressure at the end of the perforation hole 11 when the grout material G is injected due to slime and ground disturbance generated during ground drilling.

Accordingly, when the injection pressure of the first section space portion S at the tip of the perforation hole 11 decreases, the injection pressure may also decrease in the space portion S of the remaining sections.

Accordingly, a tip packer 34 may be provided outside the front end of the steel pipe 3 so as to maintain a constant injection pressure of the front end of the perforated hole 11, that is, the first section space S.

The tip packer 34 expands as an injection material such as grout material G is injected, and is in close contact with the hole wall of the perforation hole 11. Accordingly, the first section space S is sealed to maintain the injection pressure of the grout material G.

In addition, the tip packer 34 expanded by filling the injection material may serve as an anchor head whose cross section is enlarged at the front end of the steel pipe 3 to serve as a pull-out resistor.

As shown in FIG. 7, a front end injection hole 35 communicating with the inside of the tip packer 34 may be formed on an outer circumferential surface of the front end of the steel pipe 3.

Accordingly, when the grout material G is injected into the first section space S, the tip packer 34 can be expanded at the same time, so there is no need to install a separate injection hose for expansion of the tip packer 34.

That is, when the grout material (G) is injected into the first section space (S) through the injection hose (5), the grout material (G) flows into the tip packer (34) through the tip injection hole (35). As a result, the tip packer 34 is expanded.

A check valve (not shown) may be installed in the tip injection hole 35 so that the injection material filled in the tip packer 34 does not flow back into the steel pipe 3.

8 to 11 are diagrams showing a step-by-step process for a construction method of a sealingless simultaneous injection steel pipe reinforcement system according to an embodiment.

The present invention relates to a method of constructing the above-described non-sealing simultaneous injection steel pipe reinforcement system.

In the construction method of the present invention sealing-free simultaneous injection steel pipe reinforcement system, first, (a) the step of inserting the steel pipe 3 into the perforated hole 11 formed in the ground 1 is carried out (FIG. 8).

A plurality of perforation holes 11 may be formed to be inclined upward along a tunnel excavation line or the like.

After inserting the steel pipe 3 into the perforated hole 11, the outside of the steel pipe 3 at the entrance of the perforated hole 11 may be closed with a caulking material 33.

And (b) the partition wall disk 4 to which the injection hose 5 is coupled is inserted into the steel pipe 3 to be fixed (FIG. 9).

The injection hose 5 may be previously combined with the partition wall disk 4, and the partition wall disk 4 to which the injection hose 5 is coupled may be inserted into the steel pipe 3 at the same time. Thereafter, the entrance of the steel pipe 3 may be closed with a cap 32.

The injection hose 5 may be provided as many as the number of spaces S partitioned by the partition wall disk 4.

Thereafter, (c) the injection pump 6 is connected to each of the injection hoses 5 (FIG. 10).

The injection pump 6 is connected to an injection plant 7 supplying the grout material G.

Finally (d) the injection pump 6 is operated to simultaneously inject the grout material G into each space S inside the steel pipe 3 partitioned by the partition disk 4, and the steel pipe 3 The grout material (G) is discharged to the outside of the steel pipe 3 through the injection hole 31 of (Fig. 11).

In the step (d), each injection pump 6 is operated to pressurize the grout material G to the injection hose 5 connected to each injection pump 6 at high pressure.

Then, the grout material (G) is simultaneously injected into each space (S) inside the steel pipe (3) partitioned by the partition wall (4), and the grout material (G) is filled in the internal space (S) of the steel pipe (3). (G) is discharged to the outside of the steel pipe 3 through the injection hole 31 of the steel pipe 3.

In this way, since the grout material G is injected to the outside of the steel pipe 3 at the same time for each of the spaces S, it is possible to inject the grout material G tightly to a wide range within the rock joint without lowering the injection pressure.

12 and 13 are diagrams showing a process for a construction method of a sealingless simultaneous injection steel pipe reinforcement system according to another embodiment.

Unlike the embodiments shown in Figs. 8 to 11, in the construction method of the present invention sealing-free simultaneous injection steel pipe reinforcement system, (a) reinforcement by inserting the bulkhead disk 4 and injection hose 5 inside the steel pipe 3 The step of pre-fabricating the unit 2 may be carried out first (Fig. 12).

In this way, when the reinforcing unit 2 is prefabricated by pre-assembling the steel pipe 3, the partition disk 4 and the injection hose 5, field work can be minimized.

The cap 32 may be fixed to the end of the steel pipe 3 in advance.

Next, (b) the reinforcing unit 2 is inserted into the perforated hole 11 formed in the ground 1 (FIG. 13).

Since the pre-manufactured reinforcing unit 2 is inserted and installed in the pre-drilled perforation hole 11, it is possible to shorten the construction period by minimizing field work.

After the reinforcing unit 2 is inserted and installed, the entrance of the perforated hole 11 can be closed with a caulking material 33.

And (c) connect the injection pump 6 to each of the injection hoses (5).

The injection pumps 6 are connected to an injection plant 7 for supplying the grout material G.

Finally (d) the injection pump 6 is operated to simultaneously inject the grout material G into each space S inside the steel pipe 3 partitioned by the partition disk 4, and the steel pipe 3 The grout material (G) is discharged to the outside of the steel pipe (3) through the injection hole 31 of.

Steps (c) and (d) are as described in the construction method of the above-described non-sealing simultaneous injection steel pipe reinforcement system with reference to FIGS. 8 to 11.

In this case, the partition wall disk 4 includes a disk body 41 having a through hole 411 through which the injection hose 5 passes, and a water expansion index member 42 provided to surround the outer circumferential surface of the disk body 41. ).

14 is a view showing a reinforcing unit immersed in a water tank.

As shown in FIG. 14, in the step (a), the reinforcing unit 2 is immersed in water to expand the water expansion index member 42 of the partition wall disk 4 so that the partition wall disk 4 becomes a steel pipe 3 It can be fixed inside of.

After assembling the reinforcing unit 2, the entire reinforcing unit 2 is immersed in water W and submerged for a sufficient time, so that the partition wall disk 4 can be fixed inside the steel pipe 3 in advance.

That is, when the reinforcing unit 2 is submerged, water W is introduced into the steel pipe 3 through the inlet of the steel pipe 3 and the spray hole 31 of the steel pipe 3, The water expansion index material 42 absorbs water (W) and expands.

Accordingly, the process of fixing the partition wall disk 4 is very simple and easy.

In addition, since the reinforcement unit (2), which is completely assembled at the site and the bulkhead disk (4) is fixed in the steel pipe (3) in advance, only needs to be inserted into the perforated hole (11), handling of the reinforcing unit (2) is easy, and on-site construction Time can be greatly shortened.

A tip packer 34 is provided outside the front end of the steel pipe 3, and a tip injection hole 35 communicating with the inside of the tip packer 34 is formed on the outer circumferential surface of the front end of the steel pipe 3, and the (c In step ), the grout material G injected into the foremost space part S is introduced into the inside of the tip packer 34 through the tip injection hole 35 so that the tip packer 34 may be expanded.

When the grout material (G) is injected into the first section space (S) through the injection hose (5), the grout material (G) flows into the tip packer (34) through the tip injection hole (35) and The packer 34 is inflated.

Accordingly, since the tip packer 34 is in close contact with the hole wall of the perforated hole 11 to seal the first section space S, it is possible to maintain the injection pressure of the grout material G.

1: ground 11: perforated hole
2: reinforcement unit 3: steel pipe
31: spray hole 32: cap
33: caulking material 34: tip packer
35: tip injection hole 4: bulkhead disk
41: disk body 411: through hole
412: groove 42: water expansion water-stop material
5: injection hose 6: injection pump
7: injection plant 8: water tank
G: grout material S: space
W: water

Claims (10)

delete delete delete delete delete delete It is inserted into the perforation hole 11 formed in the ground 1, the steel pipe 3 having a plurality of injection holes 31 formed on the outer circumferential surface, the steel pipe 3 is provided to be spaced apart from each other so that the inside of the steel pipe 3 The through hole 411 is formed through the partition by the space S, and the inside of the disk main body 41 having the groove 412 formed on the outer circumferential surface and the groove 412 formed on the outer circumferential surface of the disk main body 41 A plurality of partition wall disks (4) and the steel pipe (3) composed of a water expansion index member (42) provided to surround the outer circumferential surface in a ring shape or a spiral by inserting an inner part and an outer part protruding to the outside of the disk main body (41). ) It is provided through the through hole 411 of the partition wall disk 4 inside, and the front end is provided inside each space part S to inject a grout material G for each space part S. A reinforcing unit (2) consisting of an injection hose (5); An injection pump 6 for pumping the grout material G to each of the injection hoses 5; And an injection plant 7 for supplying grout material G to the injection pump 6; It is to construct a sealingless simultaneous injection steel pipe reinforcement system consisting of,
(a) The bulkhead disk (4) and the reinforcing unit (2) in which the injection hose (5) is inserted into the steel pipe (3) are immersed in water to expand the water expansion index member (42) of the partition wall disk (4). Pre-fabricating the reinforcing unit 2 so that 4) is fixed to the inside of the steel pipe 3;
(b) inserting the reinforcing unit (2) into the perforated hole (11) formed in the ground (1);
(c) connecting the injection pump 6 to each of the injection hoses 5; And
(d) By operating the injection pump 6, grout material (G) is simultaneously injected into each space (S) inside the steel pipe (3) partitioned by the partition wall disk (4), and the portion of the steel pipe (3) Allowing the grout material (G) to be discharged to the outside of the steel pipe (3) through the hole (31); Construction method of a non-sealing simultaneous injection steel pipe reinforcement system, characterized in that consisting of.
delete delete In clause 7,
A tip packer 34 is provided outside the front end of the steel pipe 3, and a tip injection hole 35 communicating with the inside of the tip packer 34 is formed on the outer circumferential surface of the front end of the steel pipe 3, and the (c In step ), the grout material (G) injected into the foremost space (S) is introduced into the inside of the tip packer (34) through the tip injection hole (35), and the tip packer (34) is expanded. Construction method of a sealing-free simultaneous injection steel pipe reinforcement system.

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