JP6361045B2 - Removal method of earth retaining members - Google Patents

Description

The present invention relates to a method of removing a soil retaining member after construction of soil retaining work using a soil retaining member such as a sheet pile (steel sheet pile).

When constructing underground pipes such as water pipes, gas pipes, culvert boxes, sewer pipes, gutters, etc., first install earth retaining members such as simple sheet piles, iron plates, and sheet piles at the positions where both walls of the groove should be constructed. After preventing the groove wall from collapsing, the ground is excavated to form a groove, and laying work such as a water pipe in the groove is performed. When the laying operation is completed, the earth retaining member is pulled out. The earth retaining member collected in this way is reused in the next construction. However, when sand or soil is piled up in the groove and the retaining member is pulled out, a void corresponding to the volume of the retaining member is generated in the ground. The inventors of the present application point out in Patent Documents 1 to 3 that the surrounding earth and sand move to fill this gap, and various problems such as ground subsidence may occur, and a soil retaining method for preventing this is disclosed. did. In addition, Patent Document 4 describes that earth and sand are dropped to fill a gap when a steel sheet pile is pulled out. Patent Literature 5 and Patent Literature 6 describe that “ground compaction agent” is poured to fill a cavity, and Patent Literature 7 describes that “filler” is injected.

Furthermore, in Patent Document 8, an injection pipe is installed along the earth retaining member, the earth retaining member is pulled up while injecting the injection material from the injection pipe, and the earth retaining member is removed by filling the trace of the earth retaining member with the injection material. A method is described. An injection pipe is installed at a ratio of one to three earth retaining members.

Patent No. 3940735 JP 2008-101373 A JP 2006-291701 A JP-A 64-58713 JP 57-108311 A JP 57-108312 A JP 49-49404 JP 2011-236637 A

Patent Documents 1 to 8 describe a soil retaining method related to preventing adverse effects such as ground subsidence caused by voids in the trace of the retaining member. However, in Patent Documents 4 to 7, no specific explanation is given, and some technically contradictory descriptions are included, and the invention cannot be implemented based on these documents. . It seems that the inventions described in Patent Documents 4 to 7 were not implemented.

It is considered that the earth retaining member drawing method that does not generate a void due to the drawing of the earth retaining member was first implemented by the inventors of this application based on the inventions described in Patent Documents 1 to 3, or Patent Document 8. As a result, it is possible to prevent ground subsidence caused by pulling out the retaining member and metal contamination caused by leaving the retaining member.

However, in order to implement the construction methods disclosed in Patent Documents 1 to 3, an injection pipe must be installed in advance along the earth retaining member. In order to inject the injection material, a hose for introducing the injection material must be attached to the upper end of the injection tube. When the injection tube is pulled out, the operation of removing the hose and replacing it with the next injection tube is repeated. It is. This work is a process added to the conventional retaining member removal method, and the cost and time concerning construction increase accordingly. In particular, if the cost due to this work becomes too large, the merit of cost reduction due to the fact that the earth retaining member can be reused becomes thin.

Therefore, Patent Document 8 proposes to install an injection pipe at a ratio of one for three earth retaining members. The injection material discharged from the injection pipe is based on the knowledge that it reaches the next earth retaining member. Then, while injecting with the injection pipe, the soil retaining members on both sides are pulled out, and finally the soil retaining member with the injection pipe attached is pulled out, so that ground subsidence when the soil retaining member is removed or immediately after the removal is prevented. However, in the invention of Patent Document 8, since the hydraulic pile press-fitting and drawing machine is used, the number of injection pipes installed cannot be reduced more than that.

An object of the present invention is to further reduce the number of injection pipes installed, thereby reducing the costs associated with construction, and to achieve a more energy-saving and resource-saving construction method.

In order to solve the above-mentioned problem, the method of removing a retaining member according to the present invention is to install an injection pipe along the retaining member, and to pull up the retaining member while injecting the injection material from the injection tube, and to inject the trace of the retaining member. This is a method of removing a retaining member that is filled with a material, and is characterized in that an injection pipe is installed at a ratio of one to four or more retaining members. In particular, a set of 5 or more and 7 or less retaining members is installed, and an injection pipe is installed only along the central retaining member, and an injection tube is not installed while injecting injection material from the injection tube in the set. By pulling up the member, and then pulling up the earth retaining member at the position where the injection pipe is installed while injecting the injection material from the injection pipe, the working time and cost can be greatly reduced. By installing an inclinometer in the hole and adjusting and injecting it within the range of 2 to 4 times the volume of the earth retaining member that can raise the injection amount of the injected material while measuring the inclination of the ground with the inclinometer Even with the use of a small amount of injection material, the injection material can reach a distant retaining member.

Moreover, the steel sheet pile is used as the earth retaining member, and the direction of the steel sheet pile is alternately arranged and installed in a wavy shape, and the injection pipe is installed at a ratio of one to four steel sheet piles. It is also possible to install the injection tube only for the steel sheet pile on one side in the arrangement.

According to the earth retaining member removing method of the present invention, the number of injection pipes used can be greatly reduced, and the time required for the installation of the injection pipes and the replacement of the hoses can be shortened. .

It is a top view which shows the 1st example of arrangement | positioning of a earth retaining member and an injection pipe. It is a perspective view which shows the earth retaining member with an injection tube. It is a conceptual diagram which shows the example of an injection tube. It is a front view which shows the example of the front-end | tip member of the injection pipe for earth retaining work. It is the same rear view. It is the same side view. It is the same AA sectional view. It is the BB sectional drawing. It is a conceptual diagram which shows another example of an injection tube. It is a side view which shows the detail of the upper part of an injection tube. . It is a side view which shows a connection member. It is a top view which shows an injection tube fixing member. It is a front view which shows a cap. It is a side view which shows a hose attachment member. It is the same top view. It is a side view which shows the attachment state of a hose attachment member. It is a conceptual diagram which shows the operation | work of earth retaining member removal. It is sectional drawing which shows the anti-blur member of an injection tube. It is a top view which shows the rubber plate of an anti-blur member. It is a top view which shows the 2nd example of arrangement | positioning of a earth retaining member and an injection pipe. It is a top view which shows the 3rd example of arrangement | positioning of a earth retaining member and an injection pipe.

EMBODIMENT OF THE INVENTION The form for implementing this invention is demonstrated based on drawing. It is a top view which shows the example of arrangement | positioning of a earth retaining member and an injection pipe.

As the earth retaining member x, a steel sheet pile having a U-shaped cross-sectional shape is used. Prior to the construction of embedding water pipes, gas pipes, etc., the earth retaining members 1 are installed side by side to form the earth retaining wall. In the case of a steel sheet pile, the connecting portions called sections provided at the end portions are joined together and driven in order from the end. At this time, the steel sheet piles are arranged in a wave shape while the directions are changed alternately. The driving operation of the earth retaining member is not specified, and an impact driving device, a hydraulic pile press-in / drawer, or a vibration pile driver can be used.

In the earth retaining member removing method of the present invention, the injection pipe 2 is installed in the ground along the earth retaining member 1. Here, the injection pipe 2 is not provided in all the retaining members 1, but is installed at a ratio of one to four or more retaining members. In the example of FIG. 1, the injection pipe is installed only for one of the five retaining members. For example, five earth retaining members indicated by reference numerals 1a _-2 , 1a _-1 , 1a ₀ , 1a ₁ , 1a _{2 form} a set (a), and an injection tube 2a is connected to the central earth retaining member 1a _0. Installed. Other four earth retaining member _{1a -2, 1a -1, 1a 1} , inlet tube for 1a ₂ are not installed.

The injection pipe 2 may be attached to the earth retaining member 1 in advance and driven together with the earth retaining member, or may be installed later along the earth retaining member already installed. FIG. 2 is a perspective view showing an example of a soil retaining member to which an injection tube is attached in advance. When the injection pipe is built together with the earth retaining member, the earth retaining member with the injection pipe as shown in FIG. 2 is used. The steel sheet pile 1 has a wide center surface and side surfaces on both sides thereof, but is attached along the center line of the center surface in the example of FIG.

The injection tube will be described. Here, the injection tube is a generic name for a series of members including the tip member and attached to the earth retaining member for injection of the injection material. FIG. 3 is a conceptual diagram showing an injection pipe, which is an example attached to the earth retaining member of FIG.

The intermediate rods 21a and 21b are two cylindrical pipes provided in parallel. Each pipe 21a, 21b forms an independent chemical liquid flow path. The intermediate rods 21a and 21b are divided in the length direction. And it connects by the connection member connected by inserting in a length direction.

And the anti-shake member 22 is attached to a connection location. The anti-blur member 22 has a substantially rectangular parallelepiped outer shape, and two holes 22a and 22b for receiving the pipes 21a and 21b pass therethrough. The positional relationship between the pipes 21a and 21b is fixed by the anti-blur member 22 to prevent the pipes 21a and 21b from blurring when the earth retaining member is installed. At the top, an injection material introducing member 24 for connecting a hose 23 for supplying a chemical solution is provided.

FIG. 4 is a front view showing an example of a tip member of a soil retaining construction injection pipe, FIG. 5 is a rear view thereof, FIG. 6 is a side view thereof, FIG. 7 is a sectional view taken along the line AA, and FIG. It is sectional drawing. The tip member 10 has an upper member 12 and a lower member 13. The upper member 12 is a substantially rectangular parallelepiped, and two or more injection material inlets 14a and 14b are provided in the upper part. In this example, two independent injection material inlets 14 are provided in parallel. The back surface of the upper member 12 is a soil retaining member contact surface, and is formed flat so as to be in close contact with the surface of the earth retaining member 1.

A wide space following the injection material inlets 14 a and 14 b is provided inside the tip member 10 and serves as an injection material mixing chamber 19. A circular hole penetrating to the lower surface of the tip member 10 is formed under the injection material mixing chamber 19 and serves as a plug moving path 17. A hole penetrates in a lateral direction from a middle position of the stopper moving path 17 toward a surface other than the retaining member contact surface, and serves as an injection material discharge hole. In addition, a pressure relief hole is provided in the middle lower part of the plug moving path 17 so as to extend from the retaining member contact surface.

The lower member 13 also has a substantially rectangular parallelepiped shape at the upper portion, but the front end portion is cut out obliquely at the front side and has a wedge shape. The back surface of the lower member 13 is also finished flat, and serves as a retaining member contact surface. A cylindrical protrusion is formed on the upper portion of the lower member 13, and the outer diameter thereof corresponds to the inner diameter of the plug moving path 17.

A plug 15 is provided in the plug moving path 17 so as to be movable up and down. The outer diameter of the stopper 15 is substantially the same as or slightly smaller than the inner diameter of the stopper moving path 7. A biasing member 16 such as a spring is provided under the stopper 15 to apply a force for pushing the stopper 15 upward. When no other external force is applied, the stopper 15 is pushed up to the top. The stopper 15 closes the injection material discharge hole 18 when the stopper 15 is at the top, and the stopper 15 does not block the injection material discharge hole 18 when the stopper 15 is lowered. The stopper 15 has a sufficient length, and the injection material discharge hole 18 is not yet opened when the plug 15 is slightly lowered, and the injection material discharge hole 18 is opened when it is sufficiently lowered. The length of the plug movement path 27 is 100 mm or more and 120 mm or less, the length of the plug 12 is 38 mm or more and 42 mm or less, and the spring 12 is lowered to the open position of the injection material discharge hole when a force of 5 kg or more is applied. It is preferable to make it strong. In this example, the inner diameter of the plug moving path 17 is 18.2 mm, the length is 110 mm, the length of the plug 12 is 40 mm, and when the force of 6 kg is applied, the plug 12 reaches the open position of the injection material discharge hole 18. We used a spring that was strong enough to come down. Thereby, the impact and vibration at the time of driving cannot be easily lowered to the open position of the injection material discharge hole 18, and can be lowered to the open position of the injection material discharge hole 18 by the pressure of the injection material at the time of injection.

FIG. 9 is a conceptual diagram showing another example of the injection tube. It is an example of the injection pipe | tube suitable for driving into the ground later with respect to the earth retaining member already erected. In this example, the intermediate rod is a cylindrical pipe having a double tube structure. Install in the ground using a boring machine. A bit for digging is provided at the tip. Attach a hose attachment port for introducing water to the top of the intermediate rod, and drive it into the ground while discharging water from the tip. Also in this example, the length, diameter, and strength of the spring of the tip member are the same as in the example of FIG. When the injection tube is driven to the required depth, remove the hose attachment port.

10 is a side view showing details of the upper part of the injection tube, FIG. 11 is a side view showing the connection member, and FIG. 12 is a plan view showing the injection tube fixing member. After removing the hose attachment port, the connecting member 30 is attached to the upper end of the intermediate rod 22. The connecting member 30 has a double tube structure, and has a threaded portion at the lower portion and a female threaded portion at the upper portion, and a flange portion 31 having a large diameter is formed in the middle. The flange 31 is provided with a notch for attaching a wrench. Since the male screw portion is formed at the upper end of the intermediate rod, it can be inserted into the screw portion, and the connecting member 30 can be fastened easily and reliably with a wrench.

The injection pipe fixing member 32 is formed in a substantially L shape by a vertical earth retaining member contact plate 33 and a horizontal connection member contact plate 34. A substantially triangular reinforcing plate 35 is provided between the earth retaining member contact plate 33 and the connection member contact plate 34. The substantially triangular reinforcing plate 35 makes it difficult for the injection tube fixing member 32 to be deformed, and can withstand repeated use 10 times or more. The connection member contact plate 35 is formed with a space for fitting the lower part of the connection member into a U shape when viewed from above. This injection tube fixing member 32 is installed at the upper end of the intermediate rod.

The injection tube fixing member 32 is attached to the upper end of the intermediate rod as shown in FIG. The earth retaining member contact plate 33 is applied to the surface of the earth retaining member x, and the connection member contact plate 34 is applied to the lower surface of the flange portion 31 of the connection member 30. At this time, the portion below the flange portion 31 of the connection member 30 is accommodated in the space portion of the connection member contact plate 34. Then, the earth retaining member contact plate 33 is welded to the surface of the earth retaining member x. Further, the connection member contact plate 34 is welded to the lower surface of the flange portion 31 of the connection member 30. Thus, the upper end portion of the intermediate rod 22 is firmly fixed to the earth retaining member x via the connecting member 30 and the injection pipe fixing member 33.

On the other hand, since the intermediate rod 22 having a long double pipe structure is made of a material having low resistance to welding, if the intermediate rod 22 is directly welded, the intermediate rod 22 is easily damaged. However, in this example, the intermediate rod 22 need not be welded. Since the connecting member 30 and the injection pipe fixing member 32 can be made of a normal steel material suitable for welding, the welding is easy, and after use, it can be removed and recovered and used repeatedly.

FIG. 13 is a front view showing the cap 36. A male screw portion that engages with the female screw portion of the connection member 30 is formed at the lower portion. In addition, an O-ring is provided to improve the sealing performance. By screwing this into the female thread portion of the connecting member 30, the upper portion of the intermediate rod 22 is sealed. The cap 36 has a high sealing performance, prevents dirt and sand from entering from the top, and blocks air from entering and exiting the intermediate rod. In the earth retaining member removing method of the present invention, since the injection material reaches far away, the injection material discharged into the ground from one injection pipe tries to flow in from the lower end of the next injection pipe, but this cap is attached. In this case, the backflow of the injection material from below is prevented by the air sealed inside. In this way, the installation of one injection tube is completed. By repeating this operation, all the injection tubes are installed in advance.

FIG. 17 is a conceptual diagram showing the work of removing the retaining member. In the example of FIG. 1, it is preferable to use a vibration pile driver. The vibration pile driver can pull up the earth retaining member in a short time. In addition, since it is suspended by a work carriage such as an endless track, it can freely move on the ground, and the order of extracting the retaining members can be freely selected.

Before starting the drawing operation, attach a hose for introducing the injection material to the top of the injection tube. When the removal of the a set of retaining members 1a of FIG. 1 is started, a hose is attached to the injection pipe 2a of the set. For example, when the injection tube of FIG. 9 is used, a hose attachment member as shown in FIG. 14 is used. 14 is a side view showing the hose attachment member, FIG. 15 is a plan view thereof, and FIG. 16 is a side view showing the attachment state of the hose attachment member. The hose attachment member 37 has a substantially rectangular parallelepiped shape, and a flat earth retaining member contact plate 38 is provided on one side surface. The hose attachment member 37 also has a double-pipe structure. By covering the hose attachment member 37 on the upper part of the connection member 30, the flow paths are connected to each other. In addition, two injection material introduction ports 39 are arranged diagonally on the upper surface. A screw portion is not particularly provided at the lower portion of the connection member 30. The cap 36 attached to the upper part of the injection tube for injecting can be attached by simply removing it and placing it on the upper part of the connecting member 30. Then, the earth retaining member contact plate 38 is applied to the surface of the earth retaining member x and fixed by welding. Two nipples having different heights are attached to the injection material introduction port 39, and a hose for introducing the injection material is attached thereto. By using nipples having different heights as described above, a nipple having a large diameter can be installed in a narrow space. Then, the first earth retaining member 1a- ₂ is first removed while injecting the injection material into the ground with the injection pipe 2a. Next, the next retaining member 1a- ₁ is removed. Then, the earth retaining member 1a ₀ with the injection pipe 2a is skipped, and the earth retaining member 1a ₁ and the earth retaining member 1a ₂ are removed. During this time, the injection is continued through the injection tube 2a. In this way, all the injection pipes other than the earth retaining member 1a ₀ with the injection pipe 2a are removed, but the extraction trace is filled by the injection from the injection pipe 2a.

Finally, the earth retaining member 1a ₀ with the injection pipe 2a is removed. The self-propelled working carriage can be moved back without any problem and the earth retaining member 1a ₀ can be pulled out. Also at this time, injection is performed by the injection tube 2a. Injection tube 2a in a state of being fixed to the earth retaining member 1a _0, withdrawn with earth retaining member. Therefore, a boring machine is not necessary when pulling out.

In addition, when an injection tube as shown in FIG. 9 is attached later, the injection tube can be connected to the earth retaining member only at the uppermost portion at the start of the drawing. Therefore, when the earth retaining member 1a ₀ is pulled up, the lower portion of the injection pipe that is not connected to the earth retaining member may be shaken. In particular, when a vibration pile driver is used, the vibration of the injection tube is greatly shaken. In order to prevent this, it is preferable to fix the injection pipe by attaching an anti-blur member to the middle part of the earth retaining member.

18 is a cross-sectional view showing the anti-blur member of the injection tube, and FIG. 19 is a plan view showing a rubber plate of the anti-blur member. The anti-shake member 40 has a steel main body portion 41 and a rubber plate portion 42. The main body 41 has a tunnel-like shape into which an intermediate rod of the injection tube enters, and foot portions serving as contact portions to the earth retaining member are formed on both sides. Moreover, a screw hole is formed in the upper part, and the presser screw 43 can be attached. The rubber plate 42 has a T-shape composed of a belt-like portion laid under the injection tube and another belt-like portion perpendicular to the belt-like portion.

When the earth retaining member is pulled up together with the injection pipe to some extent, the ascent is temporarily stopped. Then, a rubber plate 42 is inserted between the earth retaining member 1 and the injection tube 2, and the main body 41 is covered from above the injection tube 2. Then, the foot is welded and fixed to the surface of the earth retaining member 1. As a result, the movement of the injection tube is restricted, and shaking is prevented. By attaching the presser screw 43 to the screw hole and pressing it with the screw 43, the injection tube can be more firmly fixed.

After the earth retaining member 1 is pulled out, the anti-blur member 40 can be easily recovered by cutting the welded portion. This anti-blur member 40 can be reused.

Next, the curing agent used as an injection material will be described. In order to quickly fill the trace of the earth retaining member, the curing agent preferably has a short gel time for mixing two liquids.

An example of the instantaneous curing agent will be described. A liquid A is prepared by adding 80 liters of water to 80 liters of water glass (JIS No. 3 sodium silicate). As B liquid, the thing which added the hardening | curing agent for inorganic suspension water glass grout to blast furnace cement B type is prepared. For example, 50 kg of blast furnace cement type B, 10 kg of YMS45 (Sanko Colloid Chemical Co., Ltd.) and 178.7 liters are mixed to make a B liquid. YMS45 is a drug mainly composed of calcium sulfate and calcium hydroxide. By using this A liquid and B liquid on a one-to-one basis, and mixing B blast furnace cement type B 50 kg, YMS90 (Sanko Colloid Chemical Co., Ltd.) 5 kg and 181.4 liters into B liquid, The gel time at 1 to 2 minutes and 4 weeks strength 0.5 to 1 N / mm ² . These hardeners are highly safe and non-polluting drugs that do not contain poisonous or deleterious substances.

Next, an example of a slow-curing curing agent will be described. Blast furnace cement type B 50 kg, bentonite 10 kg, cement milk setting hardening accelerator YMS2000 (Sanko Colloid Chemical Co., Ltd.) 4 kg and 177.8 liters are mixed. Thus, the fluidity disappearance time is 30 to 40 minutes, and the 4-week strength is 0.71 N / mm ² .

In the present invention, a curing agent having a gel time of about 60 seconds is particularly suitable. With this time, the hardener spreads to the earth retaining member at a position two or three from the pouring position, and the soil is stabilized before subsidence occurs.

FIG. 20 is a plan view showing a second example of the arrangement of the earth retaining member and the injection pipe. In this example, the injection pipe is installed only for one of the seven retaining members. By repeatedly trying to remove the retaining member using the injection tube, by appropriately selecting the gel time and the injection amount of the hardener, the injected material can reach the position where there are three separated retaining members. I found. Thereby, the number of injection pipes to be used is further reduced, and the time and cost for construction can be greatly reduced.

Also in this example, equipment mounted on a work cart that can freely move on the ground, such as a vibration pile driver, is used. Similarly to the first example, while injecting with the injection tube, the soil retaining members before and after the soil retaining member with the injection tube are removed, and finally the soil retaining member with the injection tube is pulled out. Thus, the seven earth retaining members are safely removed while filling the traces with the injection material.

In addition, when the number of earth retaining members to be installed is not a multiple of 7, a section where the installation interval of the injection pipes is short appears. Such a short section can be provided at the top of the array. For example, when the number of the retaining members is divided by 7 and the remainder becomes 5, as shown in FIG. 20, one injection pipe is installed for the five retaining members in the first section, and thereafter Can install one injection tube for five earth retaining members.

The injection material is injected more than the volume of the earth retaining member to be pulled up. This is because, when the earth retaining member is pulled up, the surrounding earth and sand is also lifted to some extent, so that the void generated by the extraction becomes larger than the volume of the earth retaining member. Further, as in this example, in order to make the injection material reach far, it is necessary to inject a larger amount of the injection material. However, if it is used too much, the cost will increase accordingly. It is preferable to inject an injection material that is 2 to 4 times the volume of the earth retaining member to be pulled up. Furthermore, it is preferable to install and measure the injection amount while installing an inclinometer in the hole and measuring the inclination of the ground with the inclinometer in the hole. The same applies to the other arrangement examples.

FIG. 21 is a plan view showing a third example of the arrangement of the earth retaining member and the injection pipe. In this example, the injection pipe is installed only for one of the four retaining members. By arrange | positioning in this way, an injection tube will be installed only with respect to the steel sheet pile of one side by the arrangement | sequence of a wavy steel sheet pile.

Depending on the construction site, there may be cases where work can be performed only on one side due to a building nearby. According to this example, since the injection tube is provided only for the steel sheet pile on one side, it is possible to select the side that is easy to work with. Compared to the first arrangement example and the second arrangement example, the number of injection tubes is increased, but it is possible to perform the construction by the arrangement of this example even in places where the first arrangement example and the second arrangement example cannot be performed. There is a case.

This example can also be implemented by a hydraulic pile press-fitting / pulling machine in addition to the vibration pile driver. In this case, the earth retaining members are pulled out in order from the top. Therefore, when the earth retaining member with the injection pipe is pulled out, the next earth retaining member is still in the built-in state, and is pulled out after receiving the injection from the injection pipe ahead. However, as explained in the second arrangement example, since the injected material can reach the three retaining members separated, it is possible to fill the void of the extraction trace. Further, it has been found that a part of the injected material injected when the earth retaining member with the injection pipe is pulled out reaches the periphery of the next earth retaining member. Therefore, in addition to this injection, if a new injection material is delivered at the time of extraction, the extraction trace can be sufficiently filled.

Furthermore, the installation position of the injection pipe can be aligned only on one side of the arrangement of the earth retaining members by installing the injection pipe with respect to one of the six earth retaining members. In this case, equipment mounted on a work carriage that can freely move on the ground, such as a vibration pile driver, is used.

10. Tip member 12. Upper member 13. Lower member 14. Injection material inlet 15. Stopper 16. Biasing member 17. Stopper moving path 18. Injection material discharge hole 19. Injection material mixing chamber 21. Intermediate rod 22. Anti-blur member 23. Hose 24. Injection material introducing member 30. Connecting member 32. Injection tube fixing member 36. Cap 37. Hose attachment member 40. Anti-blur member 41. Main body 42. Rubber plate 43. Presser screw

Claims (5)

An injection pipe is installed along the earth retaining member, and an injection material, which is a slow hardening hardener mixed with blast furnace cement, bentonite, and a setting hardening accelerator, or an instantaneous hardening hardener that mixes two liquids. This is a method of removing the earth retaining member by pulling up the earth retaining member while injecting the injecting material and filling the withdrawal mark of the earth retaining member with the injecting material. A method for removing a retaining member, characterized in that a pipe is installed and adjusted and injected within a range of not less than 2 times and not more than 4 times the volume of the retaining member capable of raising the injection amount of the injected material . Attach a cap to block the air in and out of the intermediate rod at the top of the injection pipe, install the injection pipe along the earth retaining member, remove the injection pipe cap to inject the injection material, inject the injection material, and others Retaining member removing method of claim 1 in which injection material by a cap fitted in the injection tube is prevented from flowing from the lower portion of the injection tube. 5 or more and 7 or less retaining members are set as a set, and an injection pipe is installed only along the central retaining member. In the set, an injection pipe is not installed while an injection material is injected from the injection tube. pulling, then braced member removing method according to claim 1 or claim 2 pulls the earth retaining member position the injection tube while injecting the injection material from the injection tube is installed. Established the borehole inclinometer, earth retaining member removing method according to claim 3 for injecting while measuring the slope of the ground by borehole inclinometer. Using steel sheet piles as the earth retaining member, arranging the steel sheet piles in a wavy pattern with alternating orientation of the steel sheet piles, installing an injection tube at a rate of one for the four steel sheet piles, The earth retaining member removing method according to claim 1, wherein the injection pipe is installed only on the steel sheet pile on one side.

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