JP5390919B2 - Removal method of earth retaining members - Google Patents

Description

The present invention relates to a method for removing a soil retaining member after performing a soil retaining work in which a water pipe, a gas tube, a gutter, a culvert box, etc. are buried in the ground while retaining the soil with a soil retaining member such as a sheet pile (steel sheet pile). Is.

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 invention point out in Patent Document 1 and Patent Document 2 that the surrounding earth and sand move to fill this gap, and various problems such as land subsidence may occur, and a soil retaining method for preventing this problem Disclosed. In addition, Patent Literature 3 describes that earth and sand are dropped when a steel sheet pile is pulled out to fill a gap. Patent Document 4 and Patent Document 5 describe that a “ground compaction agent” is poured to fill a cavity, and Patent Document 6 describes that a “filler” is injected. Furthermore, Patent Document 7 describes injecting a curing agent.

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

Patent Documents 1 to 7 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 3 to 6, there is no specific explanation, 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 3 to 6 were not implemented.

After the earth retaining member is pulled out from the ground, it is necessary to lift the earth retaining member with a tow truck or the like, move the earth retaining member to a safe place, and place it sideways. Therefore, a suspension hole is provided in the upper end portion of the earth retaining member, and a hook or shackle is attached to the suspension hole for lifting. However, it has been found that when the injection tube is attached at a position over the suspension hole, the injection tube interferes and a hook or shackle cannot be attached to the suspension hole.

As a method for avoiding this, it is conceivable that the injection tube is attached at a position that does not cover the suspension hole. However, a highly free retaining member removal method that does not limit the mounting position is desired.

The present invention provides a method for removing earth retaining members that does not cause fluctuations in the surrounding ground and groundwater flow after construction, does not cause environmental problems, and can be widely applied to various devices such as pile press-fitting and drawing machines. Objective.

In order to solve the above-mentioned problem, the earth retaining member removing method of the present invention is a method for removing the earth retaining member having the suspension hole at the upper end portion, and is near the upper end portion of the soil retaining member and from the suspension hole. In addition, a spacer is attached to the lower side, an injection pipe is connected to the spacer, the earth retaining member is pulled up while injecting the injection material from the injection pipe, and the extraction trace of the earth retaining member is filled with the injection material. . In particular, it is suitable for removing the earth retaining member that has a rectangular plate-shaped central portion and rectangular plate-shaped side portions formed at both end portions of the central portion, and has a suspension hole at the upper end portion of the central portion. ing. Moreover, the fall prevention apparatus which has an annular member, a wire, and a suspension wire connection member is used, the lid | cover of an injection material upper end part is removed, and the swivel for injection material introduction is passed through the annular member of the fall prevention apparatus to the injection material upper end part It is preferable that the swivel is connected to the upper end of the injection material before the injection of the injection material is started, and the hanging wire connecting member is attached to the hanging wire.

In this invention, the injection pipe is attached via a spacer while keeping a predetermined distance from the surface of the earth retaining member, so that the suspension shackle or hook can be suspended without interfering with the injection pipe. Can be installed in the hole. Therefore, it can be widely applied to various types of machines including a press-fitting and drawing machine. Since no gap is left in the trace of the earth retaining member, there is no risk of adverse effects such as land subsidence or groundwater fluctuation around the site.

It is a perspective view which shows an example of a earth retaining member. It is a conceptual diagram which shows an injection tube. It is a left view which shows an injection pipe attachment member (spacer). It is the same top view. It is a perspective view which shows a fall prevention apparatus. It is a front view which shows the earth retaining member pressure drawing machine. It is the same top view. It is a conceptual diagram which shows the installation state of an injection tube. It is a conceptual diagram which shows the state of the pull start of a earth retaining member. It is a conceptual diagram which shows the state which connected the hook to the earth retaining member. It is a perspective view which shows an injection tube fixing member. It is a rear view which shows a pressing member. It is a conceptual diagram which shows the attachment state of an injection tube. It is sectional drawing which shows a coupling. It is a side view which shows the state which removes the injection pipe 10 from a earth retaining member. FIG.

EMBODIMENT OF THE INVENTION The form for implementing this invention is demonstrated based on drawing. The earth retaining member used in this example is shown in FIG. The earth retaining member 1 is called a sheet pile and is a commonly used earth retaining member. It has a rectangular plate-shaped central portion 2 and rectangular plate-shaped side portions 3 formed at both end portions of the central portion 2. The side portion 3 has an angle slightly larger than the right angle with respect to the central portion 2. Therefore, the earth retaining member 1 has a substantially U-shaped cross section. An end portion of the side portion 3 is formed with a bowl-shaped curl, and a portion called a section is provided. This section 4 serves as a joint that connects adjacent earth retaining members. A suspension hole 5 is provided at the upper end of the earth retaining member 1. The suspension hole 5 has an appropriate size to which a suspension hook or shackle can be attached.

As the earth retaining member, in addition to the sheet pile, one having an H-shaped cross section or a cylindrical one can be used. Also in these cases, the upper end portion is provided with a hanging hook or shackle attachment portion.

FIG. 2 is a conceptual diagram showing an injection tube. The injection tube 10 can be disassembled into a plurality of parts, and is a swivel 11, an intermediate rod 12, a discharge part 13, and a tip part 14 from the top.

The upper part of the swivel 11 is a rotating part 15 and is rotatable with respect to the main body part 16. A first hose attachment port 17 and a second hose attachment port 18 are provided on the side surface of the rotating portion 15. The inside of the swivel 11 has a double pipe structure, and two independent fluid passages are formed. And the 1st hose attachment port 17 and the 2nd hose attachment port 18 are connected with the fluid passage of the main-body part 16, respectively.

A plurality of intermediate rods 12 are provided. Like the swivel 15, the inside has a double tube structure, and two independent fluid passages are formed.

A discharge port 19 is formed on the side surface of the discharge unit 13. In the vicinity of the discharge port 19, there is a ball 20 that acts as a stopper. Further, a spring 21 is provided under the ball 20 to apply a force pushing the ball 20 upward. When there is no weight on the ball 20, the ball 20 is in a position to close the flow path leading to the discharge port 19. When a strong pressing force is applied from above the ball 20, the ball 20 descends while pushing down the spring 21, and the flow path leading to the discharge port 19 is opened.

A bit 22 made of a hard material is attached to the lower end of the distal end portion 14. Even if the ground is hard, the bit 22 can cut and advance the soil and reduce the burden on the entire injection tube 10 at the time of driving.

The swivel 11, the intermediate rod 12, the discharge part 13, and the tip part 14 are formed with screw parts so that they can be easily connected and separated from each other. The intermediate rods 12 can also be connected and separated.

FIG. 3 is a left side view showing the injection tube mounting member, and FIG. 4 is a plan view thereof. The injection tube attachment member 23 serves as a spacer for attaching the injection tube 10 at a predetermined interval from the surface of the earth retaining member 1. Here, an L-shaped member in which two plate-like portions are combined at right angles, one is a connection surface with the earth retaining member 1, and the other is a surface perpendicular to the center portion. An arc-shaped cut is formed in. The bottom of this notch is at a position 20 mm away from the connection surface with the earth retaining member 1. Further, the radius of the cut arc is the same as the radius of the outer periphery of the injection tube 10 or a coupling described later.

FIG. 5 is a perspective view showing the fall prevention device. The fall prevention device 25 includes an annular member 26, a wire 27, and a hanging wire connecting member 28. The annular member 26 is attached to one end of the wire 27, and the hanging wire connecting member 28 is attached to the other end side. The inner diameter of the annular member 26 is larger than the outer diameter of the main body portion 16 of the swivel 10 and smaller than the outer diameter of the rotating portion 15. The hanging wire connecting member 28 is also formed by forming an annular wire.

FIG. 6 is a front view showing the earth retaining member drawing machine, and FIG. 7 is a plan view thereof. This earth retaining member drawing machine 30 is a well-known device that is widely used as a noise-free and vibration-free pile material drawing machine, and performs pressure drawing and drawing of the earth retaining member by hydraulic pressure.

The earth retaining member pressure drawing machine 30 includes a chuck 31 for gripping the earth retaining member 1 that is an object of pressure drawing or extraction, and an elevating device 32 that moves the chuck 31 up and down. At the upper part of the chuck 31, there is a small circular opening 33 that allows the earth retaining member 1 to pass therethrough. In addition, a plurality of grip portions 34 for gripping the existing earth retaining members are provided. By grasping the existing pile by the grip portion 34, the reaction force is taken from the existing pile, and the earth retaining member 1 is press-fitted or pulled out from the ground by the chuck 31. Moreover, the earth retaining member press-removing machine 30 can move along the existing earth retaining member.

Next, a method for removing the retaining member using these devices will be described. First, prior to drawing the earth retaining member, the injection tube 10 is installed in the ground. The injection tube 10 is driven into the ground while drilling using a boring machine or the like. At this time, a number of intermediate rods 12 that can cover the lengths of the distal end portion 19, the discharge portion 13, and the earth retaining member 1 are connected. A plug that closes the upper end portion is attached to the uppermost intermediate rod 12 in place of the swivel 11 so that earth and sand do not enter the injection tube 10 during installation. The injection pipes 10 may be installed for all the earth retaining members 1, but when the injection material reaches far, it may be installed every two or every three. Even when installing in such a manner, it is preferable to install the injection tube 10 for the earth retaining member to be pulled out first. In the first earth retaining member, the injection material penetrates to the location of the second and subsequent earth retaining members by pulling out the injection material while injecting it. As a result, even if the second or third retaining member is pulled out without injection, the injected material injected at the time of the first pulling action acts and the movement of earth and sand is performed during the time until the next injection is performed. It can be prevented from occurring. Therefore, it is effective in the soil where the movement of earth and sand is likely to occur such as sand.

FIG. 8 is a conceptual diagram showing an installation state of the injection tube 10. The injection tube 10 is installed at a predetermined interval from the surface of the earth retaining member 1. This interval is set in accordance with the position of the bottom of the notch of the injection tube mounting member 23. In this example, since the bottom of the notch is at a position 20 mm away from the connection surface with the earth retaining member 1, the injection pipe 10 is also installed at a position 20 mm away from the surface of the earth retaining member 1. Moreover, it installs in the position along the center line of the earth retaining member 1. This corresponds to a position where the hanging hole 5 of the earth retaining member 1 is present.

The upper end of the intermediate rod 12 at the uppermost part of the injection tube 10 is set to a position lower by about 60 cm than the upper end of the earth retaining member 1. When the earth retaining member 1 protrudes about 50 cm from the ground, the upper end of the uppermost intermediate rod 12 is buried about 10 cm below the ground surface.

Then, the ground near this earth retaining member 1 is dug until the upper end of the injection pipe 10 appears. When the upper end of the injection tube 10 is dug, the stopper is removed and the coupling 40 is attached. FIG. 13 is a conceptual diagram showing the attachment state of the injection tube, and FIG. 14 is a cross-sectional view showing the coupling. The intermediate rod 12 is made of carbon steel S45C and is a material that is difficult to weld. On the other hand, the coupling 40 is made of a normal steel material and is suitable for welding. The coupling 40 also has a double tube structure, similar to the swivel 11 and the intermediate rod 12. Further, the main body portion of the coupling 40 has the same outer diameter as that of the intermediate rod 12, but the flange 40b protrudes outside the main body portion. The injection tube mounting member 23 is aligned with the lower surface of the flange 40b, and the coupling 40 is aligned with the arc-shaped cut. In this state, welding is performed on the connection surface with the earth retaining member 1. Further, welding is also performed on the contact portion between the injection tube mounting member 23 and the flange 40b. As a result, the injection tube 10 is fixed to the earth retaining member 1 via the injection tube attachment member 23. Since the coupling 40 is excellent in weldability, it can be easily welded and does not fall off during construction. A stopper is attached to the upper end of the coupling 40 to prevent earth and sand from entering the inside.

Next, the earth retaining member pressure drawing machine 30 is installed on the existing earth retaining member, and is aligned with the position of the first earth retaining member 1 to be extracted. Here, it is assumed that the injection pipe 10 is attached to the earth retaining member 1. The stopper is removed from the upper end of the coupling 40 and the swivel 11 is connected. At this time, the swivel 11 is passed through the annular member 26 of the fall prevention device 25. As a result, the annular member 26 is not separated from the swivel 11.

The retaining member 1 is grasped by the chuck 31. The chuck 31 presses two thin members against the left and right sides of the surface of the central portion 2 of the earth retaining member 1 and does not contact the vicinity of the center of the central portion 2. Therefore, the injection tube attached near the center of the central portion 2 does not hit. The opening 33 provided on the chuck 31 has only a minimum size necessary for the earth retaining member 1 to pass through, but the injection tube 10 is within the circle of the opening 33. A hose for supplying the injection material is attached to the first hose attachment port 17 and the second hose attachment port 18 of the swivel 11. Here, a two-component type curing agent that mixes two types of liquids, liquid A and liquid B, is used. The hose is connected to a curing agent supply source (not shown) through the opening 33. FIG. 9 is a conceptual diagram showing a state in which the earth retaining member starts to be pulled up.

When the retaining member 1 is grasped by the chuck 31, the retaining member 1 starts to be pulled up. While pulling up, the injection material is introduced through the hose, swivel 11 and injection pipe 10 and discharged into the ground. The earth retaining member 1 is pulled up so as to be pulled up by 50 cm in one step.

Here, an example of the injection material to be used will be described. In order to quickly fill the trace of the earth retaining member 1, the curing agent preferably has a short gel time for mixing two liquids. Therefore, an example of the instantaneous setting material will be described. Here, the product name YMS20 (Sanko Colloid Chemical Co., Ltd.) of the non-aqueous glass type inorganic suspension type is used. This is a combination of a curing agent and an accelerator, the curing agent is mainly composed of sodium carbonate and sodium aluminate, and the accelerator is mainly composed of calcium hydroxide.

A mixture of 156 liters of water, 125 kg of Blast Furnace Cement B, and 8 kg of YMS20 accelerator is designated as Liquid A. On the other hand, a mixture of 197 liters of water and 20 kg of a curing agent of YMS20 is designated as B liquid. By using this A liquid and B liquid 1: 1, the injection material whose gel time in 20 degreeC is 15 to 25 second and whose 4-week intensity | strength is 0.7 N / mm < ² > is obtained. These hardeners are highly safe and non-polluting drugs that do not contain heavy metals and do not contain poisonous or deleterious substances.

When the earth retaining member 1 is pulled up to some extent, and the upper end of the earth retaining member 1 appears on the earth retaining member extracting machine 30 through the opening 33 of the earth retaining member extracting machine 30, a hook such as a wrecker is attached to the earth retaining member 1. A shackle 41 is attached to the suspension hole 5 of the earth retaining member 1, and a hook 42 such as a wrecker is hung on the shackle 41. FIG. 10 is a conceptual diagram showing a state in which the hook 42 is connected to the earth retaining member 1. Since the shackle 41 and the hook 42 have a certain size, they protrude from the surface of the earth retaining member 1. However, a sufficient space is maintained between the earth retaining member 1 and the injection tube 10 by the injection tube attachment member 23 having a role of a spacer. Therefore, even if the injection tube 10 passes in front of the suspension hole 5, it does not interfere with the shackle 41 or the hook 42. Thereby, it is possible to safely suspend the injection tube 10 without damaging the injection tube 10.

Also, installing another shackle hanging wire connecting member 28 of the fall prevention device 25 further connects the lower wire and hook hanging on the shackles. Thus, the injection tube 10 and the suspension wire are connected via the fall prevention device 25. Therefore, in the unlikely event that the injection tube 10 is detached from the earth retaining member 1, the injection tube 10 will not fall.

In the state where the earth retaining member 10 is suspended by a tow truck or the like, the lifting is further advanced. It is preferable that the injection tube 10 is steady at every predetermined height. For example, an injection tube fixing member made of an elastic body may be used as a simple steadying means. FIG. 11 is a perspective view showing the injection tube fixing member, and FIG. 12 is a rear view showing the pressing member.

The injection tube fixing member 50 has a disc-shaped pressing member 51 and a band 52. The holding member 51 is made of rubber or the like, and has an injection tube insertion groove 53 corresponding to the outer shape of the injection tube 54. Irregularities are formed inside the injection tube insertion groove 53. The band 52 is made of an elastic member such as a tire tube. The band 52 and the pressing member 51 are connected to each other, and ends of the band 52 are connected to each other by a buckle 54, and the whole is in the shape of a ring.

The injection tube 10 is inserted into the injection tube insertion groove 53, and the band 52 is wound around the earth retaining member 1. Then, the band 52 is pulled to some extent and stretched, and in this state, the band 52 is tightened. In this way, the injection tube 10 is strongly fixed on the surface of the earth retaining member 1. The injection tube 34 is firmly fixed by the irregularities inside the tube insertion groove 53.

When the earth retaining member 1 is completely pulled out, the introduction of the injection material is finished. The earth retaining member 1 is lifted by a wrecker and moved to a safe place. And using the hose which introduce | transduced the injection material, the water for washing | cleaning is supplied to a swivel. Thus, the inside of the injection tube 10 is cleaned.

When cleaning of the injection tube 10 is completed, the earth retaining member 10 is lowered to the ground and placed on its side. The injection tube 10 is removed from the earth retaining member 1 and collected. FIG. 15 is a side view showing a state in which the injection tube 10 is removed from the earth retaining member, and FIG. 16 is a cross-sectional view thereof. The gantry 24 is inserted between the earth retaining member 1 and the injection pipe 10 so that the injection pipe 10 is lifted from the earth retaining member 1. This pedestal 24 is a combination of two plates in a T-shape, and a circular arc cut is formed in the center of the vertical plate, which is also the same as the radius of the outer periphery of the injection tube 10. Is located at a position 20 mm away from the connection surface with the earth retaining member 1. The swivel 11, the intermediate rod 12, the discharge part 13 and the like are removed while being separated. At this time, these elements of the injection tube 10 are rotated with a tool such as a pile wrench to release the connection by the screw portion. Since the injection tube mounting member 23 and the gantry 24 have a sufficient space between the earth retaining member 1 and the injection tube 10 to use a tool, the separation work can be easily performed.

Further, the welded part is scraped off and the injection pipe mounting member 23 is removed from the earth retaining member 1. Further, the welded portion of the injection pipe mounting member 23 and the coupling 40 is also cut off. The coupling 40 can be easily separated, and no cracking due to welding occurs. The injection tube 10 and the injection tube attachment member 23 thus recovered can be reused.

The above steps are repeated, and all the retaining members 1 are pulled out. In this way, the drawing operation of the earth retaining member is completed. Since the trace from which the earth retaining member 1 is pulled out is filled with the injection material, no gap remains in the ground. Therefore, there are no adverse effects such as land subsidence or groundwater fluctuation in the surroundings during and after construction.

1. Earth retaining member2. Central part 3. 4. Side part 9. Suspension hole Injection tube 11. Swivel 12. Intermediate rod 23. Injection tube mounting member 25. Fall prevention device 26. Annular member 27. Wire 28. Wire connecting member 30. Earth retaining member pressure drawing machine 31. Chuck 33. Opening 41. Shackle 42. hook

Claims (3)

It is a method of removing a retaining member having a suspension hole at the upper end, a spacer is attached near the upper end of the retaining member and below the suspension hole, and an injection tube is connected to the spacer, A method of removing a soil retaining member, wherein the soil retaining member is pulled up while injecting an injection material from an injection pipe, and a drawing trace of the soil retaining member is filled with the injection material. The earth retaining member having a rectangular plate-shaped central portion and rectangular plate-shaped side portions formed at both side end portions of the central portion and having a suspension hole at the upper end portion of the central portion is removed. Method of removing earth retaining members. A wire, an annular member attached to one end of the wire, and a hanging wire connecting member attached to the other end of the wire, and the inner diameter of the hanging wire connecting member is larger than the outer diameter of the main body of the swivel It is a method to remove the earth retaining member using a fall prevention device that is largely smaller than the outer diameter of the rotating part while preventing the injection pipe from falling , digging the ground until the upper end of the injection pipe appears, Remove the plug, through the swivel for injection material introduced into the annular member of the fall prevention device, the swivel before starting the injection of the injection material is connected to the injection member upper end, the lower wire suspending the hanging wire connecting member The earth retaining member removing method according to claim 1 or 2, wherein the retaining member is attached.

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