JP3125032B2 - Construction method of improved wall - 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 constructing an improved wall.

[0002]

2. Description of the Related Art For example, when the ground behind and below a revetment in a port or the like is fluidized due to an earthquake or the like, there is a possibility that a structure such as a caisson is broken and serious damage is caused. Therefore, as one method of coping with the fluidization of the ground, there is a method of dividing the ground into a plurality of chambers with improved walls in order to prevent water from flowing.

[0003] As a construction method of such an improved wall, conventionally,
For example, the underground continuous wall method such as the SMW method (in situ soil mixing method) is used.
Excavation is performed in a vertical wall shape in units of elements, and at this time, a mixed liquid suitable for the purpose, such as cement or bentonite, is discharged from the tip of the kneading shaft, and mixed with the in-situ soil in the soil to form one element. Create a soil cement wall.
The elements of the soil cement wall thus formed are completely wrapped to form an integrally connected wall.

[0004]

In the case of forming a long wall by such a method, a large number of soil cement walls of one element unit must be drilled from the top, and it takes time and effort to set up and move the apparatus. And the construction efficiency is not good.

[0005] In addition, since the hole is formed by drilling from the ground, it is difficult to form an improved wall below an existing structure such as a caisson.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned disadvantages of the prior art, to form an improved wall over a long range with a single drilling, and to easily apply it to the lower part of an existing structure such as a caisson. It is to provide a construction method.

[0007]

According to the present invention, in order to achieve the above-mentioned object, a hydraulic motor is incorporated in a rotary head at the tip of a flexible rod, and a first bevel gear is integrally provided at the tip of the hydraulic motor. And a jet outlet of jet water is provided, and a pair of opposed second bevel gears which rotate only in a direction orthogonal to the large bevel gear via the connecting pipe are detachably engaged with the first bevel gear. A nozzle hole is formed in the second bevel gear at an eccentric position of its rotary shaft in a direction perpendicular to the rotation direction of the rotary head to form an excavator, and the rod of the excavator is constructed vertically. After the hole is drilled in the horizontal direction with the first bevel gear and the jet water spouted from the spout, the rotary head of the rod is rotated, and after drilling a predetermined length, the first bevel gear is inserted into the first bevel gear. Engage the second bevel gear and rotate the second bevel gear while A solid wall such as cement milk and jet water are sprayed from the hole to create a cylindrical wall, and this wall is lined up while pulling out the rod to create an improved wall in horizontal, vertical and diagonal directions. It is an abstract.

According to the first aspect of the present invention, an excavator equipped with a flexible lot is inserted into a vertically installed spout, and the first bevel gear at the tip of the rod and the excavator are injected from a predetermined depth. A predetermined length is drilled in the horizontal direction with jet water jetting from the outlet, and then the second bevel gear is connected to the first bevel gear,
By rotating a bevel gear and pulling out a rod, a second wall of the bevel gear is jetted with a solidified material such as cement milk and jet water from a nozzle hole provided at a position eccentric to the rotation axis of the second bevel gear. However, a wall is formed in a flat plate shape continuously in an analog manner.

Therefore, an improved wall can be formed only by excavating one conduit. Further, since the rod is flexible, it is bent in the horizontal direction from the vertical direction, and the improved wall can be easily formed even below the structure.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional front view of an excavator used in an embodiment of the improved wall construction method of the present invention, FIG. 2 is a longitudinal sectional front view of the same main part, and FIG. 3 is an exploded front view of the same main part. The excavator used will be described first.

The excavator 1 has a hydraulic motor 4 built in a rotary head 3 of a flexible rod 2, and the hydraulic motor 4 has a spiral groove 4a formed on the outer peripheral surface of a cylindrical main body. is there. The rod 2 serves as an excavation and jet pipe.

A first bevel gear 5 which rotates in the same direction as the hydraulic motor 4 is integrally formed at the tip of the hydraulic motor 4, and a jet water outlet 4b communicating with the spiral groove 4a is provided inside. is there. Although not shown, the ejection port 4
An outlet for the consolidated material is provided in parallel with b to form a multiple pipe structure.

[0013] Two second bevel gears 7a, 7a, which rotate only in a direction orthogonal to the rotational direction of the first bevel gear 5 through a T-shaped connecting pipe 6 at the tip of the first bevel gear 5, 7b is detachably engaged at the opposed position. This second bevel gear 7
a and 7b form a conduit communicating with the connecting pipe 6 at the base end;
Nozzle holes 8a and 8b were provided on the opposite side of the base end so as to communicate with the pipes.

The nozzle holes 8a, 8b are opened in the direction of rotation of the hydraulic motor 4, that is, in the direction perpendicular to the rotation axis of the end portion 3, and spray in this direction. 7b is formed at a position eccentric with respect to the center of rotation. In the drawing, reference numeral 9 denotes a bearing.

A method of forming an improved wall using the excavator 1 will be described. There are structures such as buildings on the ground,
In order to construct an improved wall below the structure 10, as a construction procedure, first, as shown in FIG. 4, a steel pipe pile 11 is vertically driven from the ground on the side of the structure 10 to a predetermined depth, or After swiveling and press-fitting the casing, the inside of the steel pipe pile 11 is excavated as shown in FIG. 5, and when the excavation is completed, the conduit 12 is inserted into the pile and the steel pipe pile 11 is pulled out (see FIG. 6). To construct. The conduit 12 has one lower end formed into a tapered portion 12a.

If the excavator 1 is inserted as shown in FIG. 7 in a state where the connecting pipe 6 at the tip and the second bevel gears 7a and 7b are removed from the pipe 12 thus constructed, the tip 3 becomes the lower end of the pipe 12. From the horizontal direction along the tapered portion 12a. In this case, since the rod 2 is flexible, it can freely bend from the vertical direction to the horizontal direction.

In this state, when jet water is pressure-fed to the hydraulic motor 4, the jet water rotates through the spiral groove 4a of the hydraulic motor 4, and is jetted from the jet port 4b at the tip to cut the ground horizontally. I do. At the same time, the rotation of the hydraulic motor 4 also rotates the first bevel gear 5 integrated therewith, so that the ground is also horizontally drilled. At this time,
The rod 2 does not rotate, and only the rotary head 3 rotates.

When the horizontal excavation is performed for a predetermined length, the rod 2 and the rotary head 3 are withdrawn and the first bevel gear 5 is connected to the connecting pipe 6.
To connect the second bevel gears 7a and 7b. Then, the excavator 1 is reinserted into the horizontal hole excavated horizontally with the conduit 12, and jet water is supplied to the second bevel gears 7a and 7b via the spiral groove 4a, the jet port 4b, and the connecting pipe 6. Send to holes 8a and 8b. At the same time, the consolidated material is sent from a pipe provided adjacent to the jet port 4b.

When the hydraulic motor 4 is rotated in this state, the second bevel gears 7a and 7b rotate in the direction of the arrow shown in FIG. 1, that is, in the direction perpendicular to the rotation direction of the hydraulic motor 4.
And the nozzle holes 8a and 8b are the second bevel gears 7a and 7b
Since the nozzle holes 8a and 8b are formed in a position eccentric from the center of rotation of the nozzle, the nozzle holes 8a and 8b rotate in the horizontal direction in FIG. The cement milk spouted from the openings at the other ends of the pipes is respectively discharged vertically in a circular column shape. At the same time, lot 2
8 and 9, a flat plate-like improved wall 13 as shown in FIGS. 8 and 9 is formed.

The flat improved wall 13 is constructed in the same manner as described above while pulling up or laterally moving the conduit 12, and is successively formed along the conduit 12. in this case,
The jetting directions of the jet water and the cement milk ejected from the nozzle holes 8a and 8b are limited to only a fixed direction with respect to the axial direction of the rod 2, so that the direction of the rod 2 is temporarily changed to set the direction. The direction can be determined.

Therefore, by setting the injection direction arbitrarily, the improved wall 13 can be formed in any of vertical, horizontal and oblique directions as shown in FIGS. 10 to 12, and the ground as shown in FIG. It is also possible to partition in a room with a strut-like shape as shown in FIG.

The erecting port can be constructed by a CD (casing drive) excavator, and can be constructed in any stratum.

[0023]

As described above, according to the method for constructing an improved wall of the present invention, a flat wall is formed by horizontally drilling a plurality of stages from a vertically formed opening to form a flat wall and connecting the walls. The improved wall can be created by simply drilling, so the improved wall can be created over a long area with a single drilling, which improves construction efficiency.In addition, after drilling vertically, the hole is drilled horizontally from here. It can be easily installed under existing structures.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of an excavator used in a method for constructing an improved wall according to the present invention.

FIG. 2 is a partially cutaway front view of a main part of an excavator used in the improved wall construction method of the present invention.

FIG. 3 is an exploded front view of a main part of an excavator used in the improved wall construction method of the present invention.

FIG. 4 is a longitudinal sectional front view showing a first step of a method for constructing an improved wall according to the present invention.

FIG. 5 is a vertical sectional front view showing a second step of the method for constructing an improved wall according to the present invention.

FIG. 6 is a longitudinal sectional front view showing a third step of the method for constructing an improved wall according to the present invention.

FIG. 7 is a vertical sectional front view showing a fourth step of the method for constructing an improved wall according to the present invention.

FIG. 8 is a perspective view showing an embodiment of a method for constructing an improved wall according to the present invention.

FIG. 9 is a front view showing an embodiment of the improved wall construction method of the present invention.

FIG. 10 is a side view showing an embodiment of a method for constructing an improved wall according to the present invention.

FIG. 11 is a side view showing an example of an improved wall according to the improved wall construction method of the present invention.

FIG. 12 is a side view showing another example of the improved wall according to the improved wall construction method of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Excavator 2 ... Rod 3 ... Rotating head 4 ... Hydraulic motor 4a ... Spiral groove 4b ... Spout port 5 ... 1st bevel gear 6 ... Connecting pipe 7a, 7b ... 2nd bevel gear 8a, 8b ... Nozzle hole 9 ... Bearing 10 ... Structure 11 ... Steel pipe pile 12 ... Conduit 12a ... Tapered part 13 ... Improved wall

Continuation of the front page (56) References JP-A-59-217828 (JP, A) JP-A-61-113922 (JP, A) JP-A-60-230425 (JP, A) JP-A-53-144110 (JP) JP-A-52-118813 (JP, A) JP-A-8-319614 (JP, A) JP-A-51-7912 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB (Name) E02D 3/12

Claims (1)

(57) [Claims] 1. A hydraulic motor is built in a rotary head at a tip of a flexible rod, a first bevel gear is integrally provided at a tip of the hydraulic motor, and a jet outlet of jet water is provided. A pair of opposing second bevel gears that rotate only in a direction orthogonal to the large bevel gear via a connecting pipe are detachably meshed with the gear, and the eccentric position of the rotating shaft of the second bevel gear is engaged with the second bevel gear. The excavator is formed by forming a nozzle hole for jetting in a direction perpendicular to the rotation direction of the rotary head in the excavator, and the rod of the excavator is inserted into a vertically constructed opening, and the rotary head of the rod is rotated. Drilling in the horizontal direction with the first bevel gear and the jet water spouted from the jet port, drilling a predetermined length, and then meshing the second bevel gear with the first bevel gear to form the second bevel gear While rotating the gears, the cement material such as cement milk and jet water are discharged from the nozzle hole. A method of constructing an improved wall, comprising forming a cylindrical wall by spraying, forming the wall side by side while pulling out a rod, and forming an improved wall in horizontal, vertical and oblique directions.