JPH06257370A - Casing tube - Google Patents

Abstract

PURPOSE:To release connection between an upper casing tube and a lower casing tube without asking for a person's help. CONSTITUTION:An upper casing tube 42 and a lower casing tube 43 are connected together through cutout grooves 44 and projecting blocks 45 which are engaged or disengaged with each other by relative rotation. By rotating the upper casing tube 42, the projecting blocks 45 are detached from the cutout grooves 44, and hence connection between the upper casing tube 42 and the lower casing tube 43 is released without asking for a person's help.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing tube which is pushed into the ground by an all-casing excavator to maintain a hole wall of a standing hole.

[0002]

2. Description of the Related Art When constructing a shaft to be used for excavation, maintenance and inspection of a horizontal shaft installed in the ground, a casing tube is pushed into the ground using an all-casing excavator, and the shaft is protected by the casing tube. The hole wall is maintained, and the earth and sand in the casing tube are excavated and discharged.

FIG. 3 shows the construction of a vertical shaft using a conventional casing tube.

A holding device 3 for holding a casing tube 2 is provided in the main body 1 of the all-casing excavator. The holding device 3 can be turned by the turning device 4, and is turned by driving the turning motor 5. The holding device 3 is supported by the main body 1 so as to be able to move up and down, and is moved up and down by driving the push-pull cylinder 6.

The casing tube 2 is divided into a plurality of pieces in the axial direction, and the tip portion (lower end portion) of the casing tube 2 is a first tube 8 having an excavating blade 7. The upper end of the first tube 8 and the lower end of the casing tube (upper tube) 9 on the base end side are connected by a lock pin 10. The upper tube 9 is divided into three parts, and the upper tubes 9 are connected to each other by a lock pin 11.

FIG. 4 shows details of the lock pin 10. The lower end 9a of the upper tube 9 is the first tube 8
A taper hole 12 is provided which is fitted to the outer periphery of the upper end 8a of the above and extends from the lower end 9a to the upper end 8a on the lower end 9a side. A nut 13 is fitted to the lower end 9a, and a bolt 14 is screwed from the upper end 8a side. A main body 15 is rotatably provided on the bolt 14, and the outer periphery of the main body 15 is engaged with the tapered hole 12. That is, by screwing the bolt 14 into the nut 13 from the inner peripheral side of the casing tube 2, the main body 15 engages with the tapered hole 12, and the upper end 8a of the first tube 8 and the lower end 9a of the upper tube 9 are connected. . The first tube 8 and the upper tube 9 can be separated by removing the bolt 14. The lock pin 11 is one in which the bolt 14 is screwed into the nut 13 from the outer peripheral side of the casing tube 2 and has the same structure as the lock pin 10.

When constructing the shaft, the main body 1 of the all-casing excavator is installed at the shaft constructing position, and the casing tube 2 is held by the holding device 3. At the same time as the casing tube 2 is rotated by the drive of the swing motor 5, the push / pull cylinder 6 is operated in the contraction direction to push the casing tube 2 into the ground. The ground is cut into a cylindrical shape by the excavating blade 7 of the first tube 8. The excavation bucket 16 excavates the earth and sand in the casing tube 2 and discharges the earth to form a pit.

As shown in FIG. 5, a draining concrete 21 for stopping water is placed at the bottom, and an operator enters the bottom of the pit and removes the bolt 14 of the lock pin 10. While pulling out the upper tube 9, a precast 22 which is an inner wall is provided on the hole wall, and a mortar 23 is provided between the hole wall and the outer wall of the precast 22.
To build a standing pit.

[0009]

In the case of constructing a pit using the conventional casing tube 2, the first tube 8 is left in the soil and the concrete 21 is thrown out to stop the water at the bottom. When pulling out the casing tube 2 with the first tube 8 left, the operator enters the bottom of the hole and then the lock pin 1
The bolt 14 of 0 is removed. For this reason, the operation of pulling out the casing tube 2 is a dangerous operation and requires a long time.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a casing tube that does not require manual intervention when pulling out the first tube while leaving it in the soil.

[0011]

The structure of the present invention for achieving the above-mentioned object is a casing tube which is pushed into the ground by an all-casing excavator to maintain a hole wall for standing or foundation pits. It is divided into an upper casing tube that is held on the ground and pulled out to the ground after the excavation, and a lower casing tube that remains in the ground after the excavation, and the lower end and the lower portion of the upper casing tube are engaged and disengaged by relative rotation. It is characterized in that it is connected to the upper end of the casing tube.

[0012]

[Operation] After pushing the casing tube into the ground to excavate the vertical shaft, the upper casing tube is rotated to disconnect the upper casing tube and the lower casing tube by the engaging / disengaging means, leaving the lower casing tube in the ground. And pull out the upper casing tube.

[0013]

1 is a side view of a main part of a casing tube according to a first embodiment of the present invention.

The casing tube 41 is held by a holding device 3 (see FIG. 3) of the all-casing excavator and is pulled out to the ground after excavation, and an upper casing tube 42,
It is divided into a lower casing tube 43 left in the ground after excavation.

At the lower end of the upper casing tube 42, there are provided a plurality of hook-shaped notched grooves 44 which are continuous in the axial direction (vertical direction in the drawing) and in the circumferential direction (horizontal direction in the drawing). A projection block 45 is provided at the upper end of the lower casing tube 43 so as to face the cutout groove 44, and the projection block 45 is fitted in the cutout groove 44. That is, the notch groove 44 and the protrusion block 45 constitute an engaging / disengaging means.

When pushing the casing tube 41 into the ground, the projection block 45 is fitted into the notch groove 44, and the upper casing tube 42 and the lower casing tube 43 are integrated. After excavating the pit, the upper casing tube 42 is rotated so that the protruding block 45 becomes the notch groove 44.
To be removed from Waste concrete is poured to fix the lower casing tube 43 in the ground, and the upper casing tube 42 is pulled out to the ground.

Therefore, the connection between the upper casing tube 42 and the lower casing tube 43 can be released without the worker removing the bolts or the like. Therefore, the lower casing tube 43 does not require any manual labor.
It is possible to pull out the upper casing tube 42 to the ground while leaving the above in the ground.

FIG. 2 shows a side surface of a main part of a casing tube according to the second embodiment of the present invention.

Like the first embodiment, the casing tube 51 is divided into an upper casing tube 52 that is pulled out to the ground and a lower casing tube 53 that remains in the ground.

A female screw portion 54 is formed on the inner periphery of the lower end portion of the upper casing tube 52. A male screw portion 55 that is screwed into the female screw portion 54 is formed at the upper end of the lower casing tube 53, and the upper casing tube 52 and the lower casing tube 53 are connected by screwing the female screw portion 54 and the male screw portion 55. That is, the female screw portion 54 and the male screw portion 55 constitute an engaging / disengaging means.

When pushing the casing tube 51 into the ground, the female screw portion 54 and the male screw portion 55 are screwed together, and the upper casing tube 52 and the lower casing tube 53 are integrated. Casing tube 51 during excavation of standing shaft
Is rotated in a direction in which the female screw portion 54 and the male screw portion 55 are tightened (for example, clockwise rotation). After excavating the standing shaft,
For example, the upper casing tube 52 is rotated counterclockwise to release the screw engagement between the female screw portion 54 and the male screw portion 55. Abandoned concrete is poured to fix the lower casing tube 53 in the ground, and the upper casing tube 52 is pulled to the ground.

Therefore, the connection between the upper casing tube 52 and the lower casing tube 53 can be released without the worker removing the bolts or the like. Therefore, the lower casing tube 53 does not require manual intervention.
The upper casing tube 52 can be pulled out to the ground while leaving the above in the ground.

In the above-mentioned embodiment, the combination of the hook-shaped notch groove 44 and the projection block 45 and the female screw portion 54 and the male screw portion 55 is shown as the engaging / disengaging means, but the engaging / disengaging means is not limited to this, and the engaging / disengaging can be performed by relative rotation. As long as it does, various things can be applied.

[0024]

In the casing tube of the present invention, the upper casing tube and the lower casing tube are connected through the engagement / disengagement means that engages / disengages by relative rotation. Therefore, the upper casing tube and the lower casing tube are rotated by rotating the upper casing tube. The tube can be disconnected. As a result, the lower casing tube can be left in the ground without manpower and the upper casing tube can be pulled out to the ground, so that the safety and time reduction of the casing tube pulling operation can be achieved.

[Brief description of drawings]

FIG. 1 is a side view of a main part of a casing tube according to a first embodiment of the present invention.

FIG. 2 is a side view of a main part of a casing tube according to a second embodiment of the present invention.

FIG. 3 is an explanatory view of a construction of a vertical shaft using a conventional casing tube.

FIG. 4 is a detailed view of a lock pin.

FIG. 5 is an explanatory view of a construction status of a standing protest.

[Explanation of symbols]

 41,51 casing tube 42,52 upper casing tube 43,53 lower casing tube 44 notch groove 45 protrusion block 54 female screw portion 55 male screw portion

Claims (1)

[Claims] 1. A casing tube which is pushed into the ground by an all-casing excavator to maintain a hole wall for standing or foundation resistance, and an upper casing tube which is held by the all-casing excavator and is pulled to the ground after excavation, and after excavation. A casing tube, characterized in that it is divided into a lower casing tube left in the ground, and the lower end portion of the upper casing tube and the upper end portion of the lower casing tube are connected to each other via an engaging / disengaging means that engages / disengages by relative rotation.