JPH05311654A - Forming method for wall and pipe used for the same - Google Patents

Abstract

PURPOSE:To erect pipes in a short time and adjust the erection position of the pipes used for a wall. CONSTITUTION:A device 16 is set in a pipe 10a coupled with a collar 14, the device 16 is set to the excavation state via a driving mechanism 24 to advance the pipe 10a into the ground, the device 16 is set to the nonexcavation state when the pipe 10a advances to the preset depth, and the device 16 is extracted from the pipe 10a. The connection section 12a other than a specific connection section of another pipe 10b coupled with a collar 14 is connected to the specific connection section 12b of the pipe 10a installed previously, the device 16 is set in the other pipe 10b, the device 16 is set to the excavation state via the driving mechanism 24, and the other pipe 10b is advanced into the ground. The device 16 is set to the nonexcavation state when the other pipe 10b is advanced to the preset depth, and the device 16 is extracted from the other pipe 10b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall forming method and a pipe used therefor.

[0002]

2. Description of the Related Art For example, when constructing a bridge pier in a river, the planned construction site is surrounded by walls on four sides to prevent water from entering the wall, and then the bridge pier is constructed of concrete. A method of forming this wall will be described with reference to FIGS.
The wall 100 shown in FIG. 5 is formed by arranging steel pipes 102 in parallel. As for each pipe 102, first, a hole for the pipe 102 is dug in the ground to stand one by one. At that time, adjacent pipes 102 are connected to each other via a connecting portion 104 provided on the outer periphery of the pipes 102, and a gap between the pipes 102 is closed. The pipes 102 are connected to each other by connecting the pipes 10 to the outer peripheral surface of the pipes 102 as shown in FIG. 6 (a plan sectional view of the connected pipes 102).
The pipe 102 is formed to be long in the length direction of the pipe 102.
It is provided on both the left and right sides. The left connecting portion 104a has a U-shaped cross section, and the right connecting portion 104b has a cross section T.
It is formed in a letter shape. The connecting portion 104b is the connecting portion 104.
It can be fitted so that there is no play in the pipe a.
When the 02s are arranged side by side, the rear pipe 102 is erected while fitting both connecting portions 104a and 104b as illustrated. The wall 100 is formed by repeating this operation.

[0003]

However, the conventional wall forming method described above has the following problems. A hole must be dug in advance when the pipe 100 is erected. There is a problem that the process of digging a hole for one pipe 100 and the process of standing up the pipe 100 are required, and the work takes time. Further, when the connecting portions 104 (104a, 104b) provided in the conventional pipe 100 are fitted with the adjacent connecting portions 104a, 104b, there is no play between them, so that the pipe 100 stands up when the wall 100 is formed. There is a problem that it is not possible to finely adjust the installation position. Therefore, an object of the present invention is to provide a wall forming method capable of standing up a pipe in a short time, and a pipe whose standing position can be adjusted.

[0004]

In order to solve the above problems, the present invention has the following constitution. The method of forming the wall is a cylindrical pipe whose both ends are open, and an outer peripheral surface of the pipe,
Along the length of the pipe, a plurality of connecting portions that are spaced apart in the circumferential direction of the pipe and a cylindrical shape with both ends open are fitted in the lower end of the pipe. And a collar whose centers of the outer and inner circles are offset, a front end portion of which is insertable through the collar, and a rear end portion of which is engageable with an upper end portion of the collar located in the pipe. In the non-excavation state, the outer diameter of the rotation trajectory is less than or equal to the outer diameter of the tip, and the outer diameter of the rotation trajectory exceeds the outer diameter of the tip in the unexcavated state. A device provided with a drilling bit at the tip end, in which the rotation locus corresponding to the thinnest portion of the collar in which the centers of the outer circumference circle and the inner circumference circle are deviated includes the plane position of the specific connecting portion. , While moving the device up and down and rotating, And a drive mechanism for obtaining the device, the device is set in the pipe in which the collar is fitted, the device is excavated through the drive mechanism, and the pipe is advanced to the ground. After advancing to the depth of the pipe, the device is taken out of the pipe in a non-drilled state, and the connection part other than the specific connection part of the other pipe fitted with the collar is connected to the specific connection part of the pipe previously installed. Then, the device is set in the other pipe, the device is excavated through the drive mechanism to advance the other pipe to the ground, and when the other pipe advances to a predetermined depth, the device is not moved. It is characterized in that it is extracted from another pipe as an excavated state. Further, in the pipe used in the method for forming a wall having the above-mentioned configuration,
When the connecting portion is connected, the positions of the pipes adjacent to each other are relatively movable in the circumferential direction by a predetermined angle.

[0005]

[Operation] The operation will be described. The pipes that make up the wall advance as the device moves underground through the excavation,
It is erected underground. When the pipe is advanced to a predetermined depth, the device is pulled out from the pipe to complete the standing of the pipe. Further, since the positions of the pipes adjacent to each other are relatively movable in the circumferential direction when the connecting portion is connected, the standing position of the pipes can be adjusted.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. First, a pipe constituting a wall of this embodiment and an excavating device for guiding the pipe to the ground will be described with reference to FIGS. In FIG. 1, reference numeral 10 denotes a pipe forming a wall, which is made of steel and has a cylindrical shape with both ends open. On the outer peripheral surface of the pipe 10 and on both the left and right sides, a pair of connecting portions 12a and 12b formed in the length direction of the pipe 10 are provided (A- in FIG. 1).
(See FIG. 2 which is a sectional view of part A). The left connecting portion 12a is formed in an L-shape in cross section, and the right connecting portion 12b is formed in a square shape in which a cross section is partially cut out. FIG. 3 shows a state in which the connecting portions 12a and 12b of adjacent pipes 10 are connected to each other.
Shown in. In FIG. 3, since there is a play between the connecting portions 12a and 12b, the right pipe 10 is rotatable with respect to the left pipe 10 in the arrow B and C directions by a predetermined angle when connected. .. The cross-sectional shape of the connecting portions 12a and 12b is not limited to the illustrated shape, and may be any shape as long as the positions of the pipes 10 adjacent to each other can be relatively rotated in the circumferential direction by a predetermined angle when connected.

Reference numeral 14 denotes a collar, which is made of steel and is formed into a cylindrical shape whose both ends are open. The upper portion of the collar 14 is fitted and fixed in the lower end portion of the pipe 10. Color 1
As shown in FIG. 2, the outer circumference circle and the inner circumference circle 4 are offset from each other, and the thickness of the left side is larger than that of the right side. Reference numeral 16 is a device that constitutes an excavator and can be arranged in the pipe 10. The front (lower) end of the device 16 can be inserted through the collar 14, and the rear (upper) end is formed with an engaging portion 18 that can be engaged with the upper end surface of the collar 14 located inside the pipe 10. There is. The engagement portion 18 engages with the upper end surface of the collar 14 so that the device 16
The downward force from the inside of the pipe 10 is prevented, and the downward force applied to the device 16 is applied to the collar 14.
And can be transmitted to the pipe 10.

Reference numeral 20 denotes a bit for excavation, which is a device 1
One pair is provided on the tip surface of 6. The bit 20 is axially attached to the device 16 and arranged in point symmetry (for details, see JP-A-63-11789). In the non-excavated state, the bit 20 has an outer diameter of the rotation locus equal to or smaller than the outer diameter of the tip portion of the device 16, and can be inserted through the pipe 10 and the collar 14. On the other hand, in the excavated state, the outer diameter of the rotation locus X of the bit 20 (shown by the one-dot chain line in FIGS. 2 and 3) can be expanded beyond the outer diameter of the tip portion of the device 16. Further, in the excavated state, the rotation locus X corresponding to the thinnest portion (the right end portion in FIGS. 2 and 3) of the collar where the centers of the outer and inner circles are deviated is from above (or below) the connecting portion 12b. It is designed to include the viewed plane position.

Reference numeral 22 is a bit spline, which is first (lower)
The end is connected and fixed to the upper end of the device 16, and the upper end is connected to the hammer cylinder 24. The hammer cylinder 24 can rotate forward and backward integrally with the bit spline 22 and the device 16 and can move up and down in the pipe 10 integrally with the bit spline 22 and the device 16 about the axis by a known mechanism. A well-known hammer piston (not shown) is built in the hammer cylinder 24, and hits the top of the bit spline 22 when it moves downward. By these mechanisms, a drive mechanism for vertically moving and rotating the device 16 and applying a strike is configured.

Then, the pipe 10 having the above-mentioned structure,
A method of forming a wall using an excavator will be described with further reference to FIG. The bit 20 of the device 16 is inserted into the pipe 10 and the collar 14 without digging, and the bit 20 is projected from the lower end of the collar 14. After that, the hammer cylinder 24, the device 16, etc. are rotated in a predetermined direction to bring the bit 20 into an excavated state, and the outer diameter of the rotation trajectory X of the bit 20 is expanded beyond the outer diameter of the tip portion of the device 16 (FIG. 1). State). In this state, the pipe 10 is advanced to the ground while excavating by applying a rotational force and a striking force to the device 16 via the drive mechanism. When the pipe 10 advances to a predetermined depth, the hammer cylinder 24, the device 16 and the like are rotated in the opposite direction to the predetermined direction to make the bit 20 in the non-excavation state and reduce the rotation trajectory of the bit 20.
6 etc. are pulled out from the pipe 10. Thus, the standing of one pipe 10 is completed. The first upright pipe 10 is shown at 10a in FIG.

Subsequently, the connecting portion 12a of the second pipe 10b, into which the collar 14 is fitted, is connected to the pipe 1 which has been installed upright.
It connects with the connecting part 12b of 0a with play. In this state, the device 16 or the like is set in the pipe 10, and the device 16 or the like is driven through the drive mechanism in the same manner as in the case of the pipe 10a to advance the pipe 10b into the ground.
When 0b advances to a predetermined depth, the device 16 and the like are pulled out from the pipe 10b. This allows the pipes 10a and 1
0b are arranged side by side in a connected state. By repeating the above operation, the wall 26 can be formed by the pipe 10. At this time, since the connecting portions 12a and 12b have play with each other when they are connected, the standing position of the pipe 10 can be adjusted, and for example, a corner of a curved wall can be formed. Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. ..

[0012]

When the wall forming method according to the present invention is used,
The pipe constituting the wall advances as the device advances in the ground while excavating, and is erected in the ground. When the pipe is advanced to a predetermined depth, the device is removed from the pipe to complete the standing of the pipe, so that excavation and standing of the pipe can be performed at the same time, and workability can be significantly improved. Further, when the pipe according to the present invention is used, since the positions of the pipes adjacent to each other can be relatively moved in the circumferential direction by a predetermined angle when the connecting portion is connected, the standing position of the pipe can be adjusted. It has a remarkable effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a main part of a pipe and an excavator used in a wall forming method according to the present invention.

FIG. 2 is a cross-sectional view of a pipe and a collar corresponding to the section AA of FIG.

FIG. 3 is a partial plan sectional view showing a state where the pipes of FIG. 1 are connected.

FIG. 4 is an explanatory view showing a method of forming a wall by using the pipe and the excavating device of FIG. 1.

FIG. 5 is a partial front view of a wall formed of a conventional pipe.

FIG. 6 is a partial plan sectional view showing a state in which conventional pipes are connected.

[Explanation of symbols]

 10, 10a, 10b Pipes 12a, 12b Connection part 14 Collar 16 Device 18 Engagement part 20 Bit 24 Hammer cylinder 26 Wall

Claims (2)

[Claims] 1. A cylindrical pipe whose both ends are open, and a plurality of pipes formed on the outer peripheral surface of the pipe in the length direction of the pipe and spaced apart in the circumferential direction of the pipe. The connecting part and the collar, which is formed in a cylindrical shape with both ends open, is fitted in the lower end part of the pipe, and the outer circumference circle and the inner circumference circle are eccentric to each other, and the tip part can insert the collar. Yes, the rear end is formed with an engaging portion that can be engaged with the upper end of the collar located inside the pipe, and the outer diameter of the rotation locus is less than or equal to the outer diameter of the tip in the non-excavated state, and the excavated state In, the outer diameter of the rotation locus can be expanded beyond the outer diameter of the tip, and the rotation locus corresponding to the thinnest part of the collar where the centers of the outer and inner circles are deviated in the excavated state is specified. A drilling bit including a plane position of the connecting portion of the Device and a drive mechanism for moving the device up and down and rotating and applying a blow, and setting the device in the pipe in which the collar is fitted and setting the device through the drive mechanism. With the device in the excavated state, advance the pipe into the ground, and when the pipe has advanced to a predetermined depth, remove the device from the pipe in the non-excavated state, except for the specific connection part of the other pipe to which the collar is fitted. Connect the connection part of the pipe with a specific connection part of the pipe installed earlier, set the device in another pipe, and put the device in the excavation state through the drive mechanism to bring the other pipe into the ground. A method for forming a wall, which is characterized in that the device is advanced, and when the other pipe is advanced to a predetermined depth, the device is brought out of the other pipe in a non-digging state. 2. The pipe used in the method for forming a wall according to claim 1, wherein, when the connecting portion is connected, the positions of adjacent pipes are relatively movable in a circumferential direction by a predetermined angle. Characteristic pipe.