JP3219372B2 - Construction method of wall-shaped improved body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a wall-like improvement which is used for ground improvement and is effective for preventing ground liquefaction caused by an earthquake.

[0002]

2. Description of the Related Art Conventionally, a method for forming a wall-like improved body in the ground to prevent ground liquefaction on the ground which may be liquefied includes inserting an injection pipe into the ground and pouring a hardening material into the tip of the injection pipe. A high-pressure injection method in which the injection pipe is rotated and pulled up while injecting it from the injection nozzle, and a penetrating and extracting method in which a processing machine having a stirring blade on the ground is rotated to supply and mix the caking agent. The wall construction method is known.

[0003]

SUMMARY OF THE INVENTION The above conventional method is
In each method, since the individual form of the improved body is cylindrical, when forming in a wall shape, there is a lot of waste because it is formed with an overlap with the adjacent cylindrical improved body, and the wall thickness is more than necessary. There was a disadvantage of becoming thick. In addition, in the construction from one direction on the ground, only a lattice-like wall-shaped improvement body could be formed only in the plane direction, and a horizontal or diagonal wall-like body could not be formed.

Further, the continuous wall construction method penetrates and pulls out a processing machine having a stirring blade from the ground, and therefore has a restriction that it cannot be used when there is an existing structure or a buried pipe above the constructed wall-like improved body.

[0005]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has an injection pipe connected to the lower end of an injection pipe so as to be swingable and an injection nozzle at the tip of the injection pipe in order to improve soft ground. Is provided, the injection pipe is inserted into the ground, and the injection nozzle is swung right and left in a state where the injection pipe located below the connection point of the injection pipe and the injection pipe is downward, and the injection nozzle is moved or moved. A hardening material is injected from a spray nozzle at a high pressure while being stopped, the hardening material is mixed into the ground, the injection pipe is pulled out and / or rotated, and the wall has a wall-shaped portion and a plate-shaped portion orthogonal to the wall-shaped portion. By forming a wall-shaped improvement body and connecting and forming a plurality of the wall-shaped improvement bodies, a grid is formed in both the plane direction and the vertical direction, and the fluidity of groundwater, sand, etc. of the non-hardened portion surrounded by the wall-shaped improvement body is blocked or A method of forming a wall-like improved body that inhibits the method was adopted.

Further, according to the present invention, for protection or avoidance, an injection pipe is swingably connected to the lower end of the injection pipe, an injection nozzle is provided at the tip of the injection pipe, and the injection pipe is inserted into the ground.
The injection nozzle is located below the connection point of the injection pipe and the injection pipe, and the injection pipe is swung right and left in a downward state,
While moving or stopping the injection nozzle position, the hardening material is injected from the injection nozzle at a high pressure, the hardening material is mixed into the ground, and the injection pipe is drawn and / or rotated to form a wall-shaped improved body. By connecting and forming a plurality of arbitrary shapes, a polygonal cylindrical body or a group of cylindrical bodies sharing a partition is formed, and the middle or upper and lower ends of the non-cured portion surrounded by the cylindrical body or the cylindrical group. Mutual groundwater between non-hardened parts divided vertically and horizontally by providing a plate-like wall at one or more parts of the part,
A method for forming a wall-like improved body that blocks or inhibits the fluidity of sand or the like was adopted.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to specific embodiments shown in the accompanying drawings. The present inventor has already developed a hardening material mixing method for forming an underground wall as a countermeasure against ground liquefaction, and has filed a Japanese Patent Application No. Hei 8-2 on February 9, 1996.
No. 4207.

[0008] The hardening material mixing method will be described. The example shown in FIGS. 1 and 2 will be described. In FIG.
An injection pipe 14 is pivotally attached to the tip of the injection pipe 11 on an extension of the injection pipe 11, and an injection nozzle 15 is provided on the injection pipe 11 at the tip of the injection pipe 14. When the injection pipe 14 is pivotally mounted on an extension of the injection pipe 11, a high-pressure hardening material can be smoothly fed. Reference numeral 16 denotes a machine for moving or rotating the injection tube 11 up and down (back and forth).

After drilling, as shown in FIG.
To insert the injection tube 11 to the lower end of the formation position. next,
As shown in FIG. 2, while the injection pipe 14 is swung in the direction of the arrow by a mechanical means such as a hydraulic pump, a hardening material is injected from the injection nozzle 15, and the injection pipe 11 is pulled up to form a hardened material mixed layer V. I do. The curing agent may be injected only with the curing agent alone, or may be injected with compressed air.

[0010] In the construction of the wall-shaped improved body of the present invention, the injection pipe is swingably connected to the lower end of the injection pipe, an injection nozzle is provided at the tip of the injection pipe, and the injection pipe is inserted into the ground. The injection pipe located below the connection point between the injection pipe and the injection pipe is turned downward, and the injection pipe is swung right and left, and while moving or stopping the injection nozzle position, the hardening material is injected from the injection nozzle at a high pressure to cure. The material is mixed into the ground, and the injection pipe is pulled out and / or rotated to form a wall-shaped improved body having a wall-shaped portion and a plate-shaped portion orthogonal to the wall-shaped portion, and a plurality of the wall-shaped improved bodies are connected. By the formation, a grid is formed in both the plane direction and the vertical direction, and the fluidity of groundwater, sand, and the like in the unhardened portion surrounded by the wall-shaped improvement body is blocked or impeded.

Next, a method of forming a wall-shaped improved body having a wall-shaped portion and a plate-shaped portion orthogonal to the wall-shaped portion according to the present invention will be described with reference to FIGS. As shown in FIG. 3, an injection pipe 14 is provided at the tip of the injection pipe 11 so as to be able to swing freely, and an injection nozzle 15 is provided at the tip of the injection pipe 14. The injection pipe 11 is lowered to a required position.

Next, as shown in FIG. 4, the injection pipe 14 is arbitrarily rocked at a predetermined speed to inject the hardening material from the injection nozzle 15 and mix the hardening material into the ground to form a hardening material mixing layer 41. Create As shown in FIG.
When the hardening material is injected into the ground by injecting the hardening material from the injection nozzle 15 by oscillating the injection pipe 14 at a predetermined speed and mixing the hardening material into the ground, the hardening material mixing layer which intersects the hardening material mixing layer 41 at a right angle. 42 can be created. This completes the first-step injection. In addition, as for the injection of the hardening material, there is an injection of only the hardening material alone, but it may also be injected together with compressed air. Next, the injection tube 11 is pulled up, for example, 2.5 cm. This increases the injection step.

By repeating the above, a wall 43 having a cross-shaped cross section as shown in FIG. 6 is formed. Further, as shown in FIG. 7, the injection pipe 14 is positioned on an extension of the injection pipe on the wall 43, and the hardening material is injected from the injection nozzle 15. Plate part 4 of
4 can be created.

This plate-shaped portion can be formed not only above the plate-shaped portion but also at any position below or in the middle. Further, a method for forming the wall-shaped improved body of the present invention will be described. The wall-shaped improved body of the present invention is configured such that an injection pipe is swingably connected to a lower end of an injection pipe, an injection nozzle is provided at a tip of the injection pipe, and the injection pipe is inserted into the ground. Injecting the hardening material from the spray nozzle at high pressure while moving or stopping the spray nozzle by moving the spray tube to the left and right with the spray pipe located below the connection point of Then, the injection pipe is pulled out and / or rotated to form a wall-shaped improved body, and a plurality of the wall-shaped improved bodies are connected and formed into an arbitrary form, thereby forming a polygonal cylindrical body or a group of cylindrical bodies sharing a partition wall. A ground wall is provided between the non-cured portion divided vertically and horizontally by providing a plate-shaped wall in the middle of the non-cured portion surrounded by the tubular body or the tubular body group or at one or more locations at the upper and lower ends. In addition to blocking or impeding the flow of sand, sand, etc. The wall-shaped improved body consisting of a cylindrical body and a plate-shaped wall should be in contact with, near, or integrated with an underground pipe or an underground structure, and be formed in a prescribed arrangement This prevents damage to underground pipes and underground structures due to fluctuations in the surrounding ground due to construction and liquefaction.

FIG. 8 shows an example in which a plurality of the above-mentioned wall-shaped improved bodies of the present invention are connected to form a lattice. FIG. 9 shows a cylindrical body 34 and a plate-like wall 35 for improving the ground around the pipes 31, 32, 33 buried underground and protecting the pipes.
Are provided in a predetermined arrangement. Since the tubular body 34 and the plate-like wall 35 can be provided at arbitrary positions, the pipe 31
-It can be provided according to the size and position of 32 and 33. According to the conventional construction method, it was impossible to provide the plate-shaped wall 35. The present invention can be easily applied and can be applied not only to piping but also to underground structures such as underground dams and subways.

Further, as the cylindrical body, a square cylindrical body is shown as an example in the drawings, but the present invention is not limited to this, and it is not limited to this, and is not limited to a triangular cylindrical body, a pentagonal cylindrical body, a hexagonal cylindrical body, a polygonal cylindrical body, and a cylindrical cylindrical body. It may be a body, an elliptical tubular body, or another tubular body. FIG. 13 shows an example in which the present invention is used for the purpose of preventing damage to ground structures and underground pipes caused by liquefaction caused by an earthquake in an urban area.

As shown in FIG. 10, the cylindrical body 34 is formed by connecting the partition 36 in the plane direction over a required area in the front, rear, left and right directions. The plate-like wall 35 is a necessary cylindrical body 3
4 is provided with a required number of plate-like walls 35, and unnecessary cylindrical bodies 34 are provided.
Need not be provided. There is a tubular body 34 without a plate-like wall 35. Note that the plate-like wall 35 includes an oblique wall, and not only a wall that covers the entire opening of the tubular body 34 but also a wall that partially covers the opening.

[0018]

As described above, according to the present invention, the injection pipe is swingably connected to the lower end of the injection pipe, the injection nozzle is provided at the tip of the injection pipe, and the injection pipe is inserted into the ground. The injection pipe located below the connection point between the injection pipe and the injection pipe is turned downward, and the injection pipe is swung right and left, and while moving or stopping the injection nozzle position, the hardening material is injected from the injection nozzle at a high pressure to cure. The material is mixed into the ground, and the injection pipe is pulled out and / or rotated to form a wall-shaped improved body having a wall-shaped portion and a plate-shaped portion orthogonal to the wall-shaped portion, and a plurality of the wall-shaped improved bodies are connected. Because it is a method of creating a wall-like improved body that blocks or impedes the flowability of groundwater, sand, etc. in the unhardened part surrounded by the wall-like improved body by forming it in a lattice shape in both the horizontal direction and the vertical direction, the soft ground Can be used to protect underground objects, It can also be used in things basis.

Further, as described above, according to the present invention, the injection pipe is swingably connected to the lower end of the injection pipe, the injection nozzle is provided at the tip of the injection pipe, and the injection pipe is inserted into the ground. The injection pipe located below the connection point between the injection pipe and the injection pipe is turned downward, and the injection pipe is swung right and left, and while moving or stopping the injection nozzle position, the hardening material is injected from the injection nozzle at a high pressure to cure. By mixing the material into the ground, pulling out and / or rotating the injection pipe, creating a wall-shaped improvement body, and connecting and forming a plurality of these in an arbitrary form, the polygonal cylindrical body or partition is shared Non-cured, which is divided vertically and horizontally by providing a plate-shaped wall in the middle of the cylindrical body or the non-cured part surrounded by the cylindrical group or at one or more locations at the upper and lower ends Block the fluidity of mutual groundwater, sand, etc. between parts or Because it is a method of creating a damaged wall-like improved body, in addition to improving the soft ground, it is also possible to avoid underground pipes, to protect underground gas, water, other pipes and underground structures, to protect structures It can be used alone or in combination with the purpose of blocking the fluidity of groundwater, sand, etc. during an earthquake in an unhardened part.

[Brief description of the drawings]

FIG. 1 is a front view of a specific example used in a hardening material mixing method according to the present invention.

FIG. 2 is a perspective view showing a state where the work is performed according to the specific example of FIG. 1;

FIG. 3 is a front view of a state where an injection pipe is lowered to a predetermined position.

FIG. 4 is a perspective view showing a state in which a hardening material mixed layer is formed by an injection pipe.

FIG. 5 is a perspective view showing a state in which a hardening material mixed layer that intersects at right angles is formed by an injection pipe.

FIG. 6 is a perspective view showing a state in which a wall body having a cross-shaped cross section is formed by an injection tube.

FIG. 7 is a perspective view showing a state in which a plate-like wall is formed with an injection pipe.

FIG. 8 is a perspective view showing a state in which a grid-like wall is formed by an injection tube.

FIG. 9 is a perspective view of a basement constructed by the method for forming a wall-shaped improvement body of the present invention.

FIG. 10 is a perspective view of a wall-like improved body constructed by the method for forming a wall-like improved body of the present invention.

[Description of Signs] 11 · 31 ················································································································································································································································· / · Layer 42: hardening material-mixed layer 43: cross-shaped plate-shaped portion 44: disk-shaped and horizontal plate-shaped portion 45: grid-like wall

Claims (2)

(57) [Claims] 1. An injection pipe is swingably connected to a lower end of an injection pipe, an injection nozzle is provided at an end of the injection pipe, and the injection pipe is inserted into the ground. Injecting the hardening material at high pressure from the injection nozzle while moving or stopping the injection nozzle position by swinging the injection pipe to the left and right with the injection pipe located below facing downward, mixing the hardening material into the ground and injecting By drawing and / or rotating the pipe, a wall-shaped improved body having a wall-shaped part and a plate-shaped part orthogonal to the wall-shaped part is formed, and a plurality of the wall-shaped improved bodies are connected and formed, so that a planar direction and a vertical direction are formed. A method of forming a wall-shaped improvement body that has a lattice shape in both directions and blocks or impedes fluidity of groundwater, sand, and the like in an unhardened portion surrounded by the wall-shaped improvement body. 2. An injection pipe is swingably connected to the lower end of the injection pipe, an injection nozzle is provided at the tip of the injection pipe, and the injection pipe is inserted into the ground. Injecting the hardening material at high pressure from the injection nozzle while moving or stopping the injection nozzle position by swinging the injection pipe to the left and right with the injection pipe located below facing downward, mixing the hardening material into the ground and injecting By pulling out and / or rotating the tube, creating a wall-shaped improvement body, and connecting and forming a plurality of the wall-shaped improvement bodies to form a polygonal cylindrical body or a group of cylindrical bodies sharing a partition wall, Provide a plate-shaped wall in the middle of the non-cured part surrounded by the cylindrical body or the group of cylindrical bodies, or at one or more places at the upper and lower ends to separate ground water, sand, etc. between the non-cured parts divided vertically or horizontally. A method for forming a wall-like improved body that blocks or inhibits fluidity.