JPH073150B2 - All casing excavator and construction method - Google Patents

Description

TECHNICAL FIELD The present invention relates to an all-casing construction method in which a casing tube is inserted into the ground and an inner ground is excavated and soil is discharged in parallel.

[Conventional technology]

In the conventional all-casing method, a casing tube for preventing collapse of hole walls is inserted into the ground, and the inside is excavated and discharged with a hammer mug or a rotary bucket. Various types of internal excavation devices have been proposed, but so-called rotary excavation devices generally have their own rotary drive device as power.

[Problems to be solved by the invention]

The conventional casing tube internal excavator as described above has the following problems.

(1) Impact type excavation and earth removal devices represented by hammer grabs can be operated with a single wire rope and are easy to handle, but noise and vibration are large, resulting in reduced efficiency in underwater excavation.
There are problems such as excavation and reduction of the amount of grip on hard ground.

(2) Rotary drilling typified by earth drill buckets
The earthmoving device has low noise because it rotates and excavates with the cutter at the lower end.
Although it has low vibration, it requires a rotary drive device for that purpose, and it is very large-scaled including the related device. Also, when the rotary device is inserted into the hole, it is for temporarily fixing the device. There is a problem in that the power supply to the gripper and the rotary drive device and the handling of the hoses and cables are complicated.

(3) As a method of digging the casing tube, for example, Japanese Unexamined Patent Publication (Kokai) No. 62-17292, “Large-diameter pit excavation method and device”
It is known that a protrusion is attached to the inner wall of the casing tube and a protrusion that engages with this is also attached to the rotating bucket side, as described in, but this type of device has a protrusion of the casing tube. There is a problem that it interferes with the insertion of the reinforcing bar basket in the subsequent process, and it causes a joint rise,
It wasn't practical.

[Means for solving problems]

The inside of the casing tube is excavated by using the strong rotating force and pushing force of the casing tube inserted into the ground to protect the hole wall.

For this reason, a hollowing device (bucket) that is appropriately inserted into the casing tube is equipped with a gripper that engages with the inner surface of the casing tube.

[Action]

The hollow excavator is hung in the casing tube with a crane and fixed to the inner surface of the lower end of the casing tube with a gripper. When the casing tube is rotated / pushed in in this state, the hollow excavator also rotates at the same time to excavate the ground inside the casing tube.

〔Example〕

In FIG. 1, 1 is a full swing boring machine, 2 is a crawler crane, 3 is an excavator, 4 is a casing tube, 5 is a gripper, and 13 is a wire rope.

The full swing boring machine 1 has a function of rotating and pushing the casing tube 4 into the ground, and the crawler crane 2 has a function of suspending the hollow excavating device 3 in the casing tube 4. When the inner digging device 3 reaches the lower end portion of the casing tube 4, the gripper 5 expands and presses the inner surface of the casing tube 4, and the inner digging device 3 is integrated with the casing tube 4 and the rotational force of the full swivel boring machine 1 is increased. Excavate the ground by pushing force. The earth and sand are taken into a bucket (not shown) in the inside digging device 3, and when the pie is full, the gripper 5 is loosened to disconnect the inside digging device 3 from the casing tube 4, and the crane 2 is used to pit the inside digging device 3. Take it outside and discharge it on the ground.

The inner digging device 3 can be operated only by suspending the wire rope 13. Further, the gripper 5 is opened and closed by the weight of the digging device itself or by means such as a spring without supplying power from the other. An example of such an inner digging device 3 is Japanese Patent Application No. Sho 62-18 previously filed by the applicant of the present patent application.
The device described in 8990 can be used.

An outline of the inner digging device 3 will be described with reference to FIG.

In FIG. 2, 4 is a casing tube, 5 is a gripper, 6 is a bucket drum, 7 is a gripper jack, 8 is a pump jack, 9 is an outer cylinder, 10 is an inner cylinder, 11 is a weight,
12 is a swivel joint, 13 is a wire rope, and 14 is a cutter.

An outer cylinder 9 is fixed to the upper part of a bucket drum 6 having a cutter 14 at the lower end, and a gripper jack 7 and a gripper 5 are radially connected to the outer circumference of the outer cylinder 9. The weight 10 is attached to the upper part of the inner cylinder 10 inserted into the outer cylinder 9,
The upper end of 10 is a wire rope through a swivel joint 12.
Connected to 13.

The lower end of the cylinder of the pump jack 8 is supported by the inner cylinder 10, and the lower end of the piston rod is supported by the outer cylinder 9.

Wire rope by crawler crane 2 (see Fig. 1)
When 13 is lifted, the lower end flange of the inner cylinder 10 comes into contact with the upper end flange of the outer cylinder 9, and the whole inner digging device 3 is lifted,
Moreover, the pump jack 8 is extended, the gripper jack 7 is in an unloaded state, and the gripper 5 is in the contracted position.

When the inner digging device 3 suspended in the casing tube 4 is gradually lowered and the cutter 14 at the lower end comes into contact with the ground,
The wire rope 13 is slackened, and the weight of the weight 11, etc.
10 slides / falls in the outer cylinder 9. At this time, the pump / jack 8 is compressed, and the pressure oil generated there is introduced to the extension side of the gripper jack 7, the gripper 5 projects outward, engages with the inner surface of the casing tube, and the inner digging device 3 becomes the casing tube. Fixed against.

In this device, the casing tube 4 is operated only by operating the wire rope 13 without supplying special power from the other.
It is possible to remove it arbitrarily.

〔The invention's effect〕

In the construction method consisting of the above-mentioned device, the hollow excavation in the casing tube can be performed without noise and vibration, and at the same time the handling is very easy only by raising and lowering the wire rope,
It is not affected by water in the hole or the depth, and it is possible to excavate by the rotating force and the pushing force applied to the casing tube, which is efficient and powerful.

[Brief description of drawings]

FIG. 1 is an elevational view showing an embodiment of the all-casing excavation device of the present invention, and FIG. 2 is a detailed view of the intermediate excavation device in FIG. 1 …… Full swing boring machine 2 …… Crawler crane 3 …… Drilling device 4 …… Casing tube 5 …… Gripper

Claims (2)

[Claims] 1. A fully swiveling boring machine for rotating and pushing a casing tube, a hollow excavator having a gripper for engaging an inner surface of the casing tube, and the hollow excavator being suspended in a casing tube via a wire rope. And a crane for suspending, and loosening the hanging wire rope by fixing the inner digging device to the inner surface of the lower end portion of the casing tube via the gripper, and casing by the inner digging device accompanying rotation and pushing of the casing tube. An all-casing excavator characterized by excavating the inside of the tube and excavating soil. 2. A hollow excavator having a gripper is inserted through a hanging wire rope of a crane into a casing tube which is rotated and pushed by a full swing boring machine, and the hollow excavator is casing through the gripper. It is fixed to the inner peripheral surface of the lower end of the tube, the hanging wire rope is loosened, and the inside of the casing tube is excavated and the soil is discharged by a digging device accompanying the rotation and pushing of the casing tube. All casing excavation method.