JP2633445B2 - Earth removal equipment in cast-in-place pile method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator in a cast-in-place method for excavating excavated soil by rotating an excavating tool together with a steel pipe pile using an excavator.

[0002]

2. Description of the Related Art Conventionally, the following method has been used as a method for discharging earth and sand from a steel pipe pile in an all casing method of a cast-in-place pile method.

[0003] In the first method, a hammer grave is lifted by a crane, dropped into a steel pipe pile to get into the ground, lifted by a crane and discharged out of the steel pipe pile (for example, JP-A-61-24723). reference).

In a second method, an earth auger is used,
The outer casing and the inner screw are rotated in opposite directions to discharge the soil.

In a third method, an earth drill is used,
They are dumped directly into dump trucks.

In the first method, since the earth and sand is grasped only by the weight of the hammer club, the efficiency is poor underwater or the like, and rapid earth removal cannot be performed. In addition, the second and third methods require a large-scale dedicated machine for discharging soil, which increases construction costs,
The problem is how to secure the area. Further, a hydraulic hose is connected to the underwater part of the dedicated machine, and the control is performed by a wired method using a cable or the like.Therefore, construction efficiency is poor in foundation work and the like, and therefore, the operation of the underwater part is restricted. There was a problem.

[0007] Japanese Patent Application Laid-Open No. 54-54402 discloses that
Fix the stabilizer to the hydraulic jack in the casing,
A technique for excavating the ground by rotating a bit at the tip is disclosed. However, with such a known technique, the unloading operation is troublesome.

[0008]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an earth removal apparatus for a cast-in-place pile method capable of performing an earth removal operation efficiently and operating smoothly.

[0009]

According to the present invention, there is provided an earth removal apparatus in a cast-in-place method in which an excavator rotates an excavating tool together with a steel pipe pile to excavate excavated earth and sand. A plurality of grippers are projected on the main body at equal intervals, and a drilling tool is provided at the bottom of the main body via a digging jack, and the gripper is provided at the top of the main body. An operation valve unit having a valve for operating the excavation jack is provided, and further, an accumulator for storing hydraulic oil and an actuator for generating hydraulic pressure when lifted are provided on the main body, and an automatic control unit for the operation valve unit is provided, The automatic control means holds the pressurized oil of the accumulator with the hydraulic pressure of the actuator when lifting the earth removal device, and when the earth removal device reaches the excavated ground The pressure oil of the accumulator presses the gripper against the inner wall of the steel pipe pile, pushes down the excavator and lifts the earth removal device, and has a function to open and close the valve of the operation valve unit so that the hydraulic pressure of the actuator releases the gripper fixing. doing.

It is preferable to use a bucket type excavator, but a screw type excavator can be used.

[0011]

[0012]

According to the above-mentioned construction apparatus, the pilot pump is operated on the ground, the pilot switching valve is switched, the excavation jack is contracted by the ground pump, and the pressure is accumulated in the accumulator. .

Next, when the earth discharging device is lifted, the pilot switching valve is switched by the pilot oil pressure generated in the actuator, and the pressure oil in the accumulator is held.

Then, when the earth removal device suspended in the steel pipe pile reaches the excavation ground, the hydraulic pressure of the actuator is lost, and the pilot switching valve is switched. Thereby, the pressurized oil of the accumulator flows to the gripper, and the soil discharging device is extended and fixed to the inner wall of the steel pipe pile. At the same time, the excavation jack is extended to excavate the ground, and the excavated soil is taken into the bucket.

[0015] After the excavation, lifting the earth removal device,
The pilot switching valve is switched by the hydraulic pressure generated in the actuator, and the gripper contracts to release the fixing of the earth discharging device to the steel pipe pile. Therefore, the earth removal device is suspended above the ground, and a separately prepared earth removal device is suspended within the steel pipe pile.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a hydraulic power unit 23 is connected by a hydraulic hose 22 to an all casing excavator 21 drilled by a steel pipe pile 20. Inside the steel pipe pile 20 supported and rotated by the excavator 21, an earth removal device indicated by reference numeral 1 is suspended by a crawler crane 25 via a slinging wire 24.

Three upper grippers 3a to 3c and three lower grippers 4a to 4c (FIG. 2) are respectively provided on the upper and lower portions of the main body 2 of the earth discharging device 1 so as to project circumferentially. At the bottom of the main body 1, a bucket type excavator 6 is provided in the illustrated example via an excavation jack 5, and the excavation tool 6 is provided with an excavation blade 6 a and a bucket 6 b. A stroke sensor (not shown) for detecting the stroke of No. 5 and a level sensor (not shown) for detecting the amount of sediment in the bucket 6b are provided.

The grippers 3a to 3a are provided on the top of the main body.
3c, 4a to 4c and an operation valve unit 7 for the excavating jack 5 are provided. On the outer periphery of the main body 1, three accumulators 8a to 8c (FIG. 2) for storing hydraulic oil are provided at equal intervals. . A transceiver 9a is provided near the valve unit 7, and a ground-side transceiver 9b corresponding to the transceiver 9a is suspended in the steel pipe pile 20. Further, the main body 1 is provided with an actuator 10 (FIG. 2) for generating a hydraulic pressure in the rod-side oil chamber 10a by suspending the device 1.

In FIG. 2, the operating valve unit 7 contains first to sixth pilot switching valves V1 to V6 and sequence valves V7 and V8. These valves V1 to V8 and the devices 3a to 3c and 4a 4c, a hydraulic circuit connecting the excavation jack 5 and the actuator 10 is provided.

Next, the manner of earth removal will be described.

The earth discharging device 1 pre-accumulated in the accumulator 8 a is lifted by a crane 25 via a slinging wire 24 and is lowered to a predetermined depth of the steel pipe pile 20. Therefore,
The gripper 3, 4 is extended by the hydraulic pressure of the accumulator 8a to fix the valve in the valve unit 7 to the inner wall of the steel pipe pile 20 by automatic control described later.

Then, the all-casing excavator 21 is operated to rotate the excavating tool 6 together with the steel pipe pile 20, and the excavating jack 5 is extended so that the excavating blade 6a enters the ground, and sediment is taken into the bucket 6b. Then, after a predetermined time, the grippers 3 and 4 are contracted to lift the earth discharging apparatus 1 and set on a dump unloading stand (not shown) on the ground.

The cradle is provided in advance with the following unloading device (not shown) stored in the accumulator 8a, which is then suspended and suspended again in the steel pipe pile.

On the other hand, the discharging device 1 remaining on the gantry is discharged by the hydraulic hose 22 from the hydraulic unit 23 and accumulated in the accumulator 8a to prepare for the next operation. As a result, the loading to the dump becomes a parallel operation, and the operation time is greatly reduced. Further, since the muddy water in the excavator 6 flows out of the bucket 6b into the steel pipe pile 20, no muddy water treatment equipment is required on the ground.

Next, automatic control of the operation valve unit 7 by hydraulic pressure will be described.

FIG. 2 shows a state where oil is supplied to the accumulator by a hydraulic unit on the ground.

On the ground, the draining device 1 is connected via a hydraulic hose 22 to a pump P and a pilot pump PP of the hydraulic unit 3. Then, the first to sixth pilot switching valves V1 to V6 are switched to positions not shown by the pilot pressure of the pilot circuit L3. Therefore, the pressure oil of the pump circuit L1 is supplied to the first and fifth pilot switching valves V
1, and flows into the rod-side oil chamber 5a of the excavation jack 5 via V5. Thereby, when the cylinder stroke reaches the upper limit as shown in the figure, the pressure is accumulated in the accumulator 8a. At this time, the oil in the head side oil chamber 5b of the excavation jack 5
The oil in the accumulators 8b and 8c is returned from the tank circuit L2 to the tank T through the pilot switching valve V4, and the sixth pilot switching valve V
6 and is returned to the tank circuit L2.

FIG. 3 shows a state where the discharging apparatus 1 is suspended.

When the earth discharging device 1 is suspended, hydraulic pressure is generated in the rod oil chamber 10a of the actuator 10, and the first to third pilot switching valves V1 to V1 are connected via the pilot circuit L4.
V3 is switched to the position shown in the figure and held at that position. Therefore, the pressure oil of the accumulator 8a is held. Therefore, the hydraulic hose 22 is disconnected, and the discharging device is connected to the steel pipe pile 20.
Hang it inside.

FIG. 4 shows a state in which the discharging apparatus 1 has reached the excavated ground of the steel pipe pile 20.

When the earth discharging device 1 reaches the excavated ground, the pressure in the rod-side oil chamber 10a of the actuator 10 disappears. Therefore, the first to third pilot switching valves V1
To V3 are switched to the positions shown in the figure by the built-in spring. Therefore, the pressure oil of the accumulator 8a passes through the first pilot switching valve V1, and the grippers 3a, 3b, 4
a, and flows into the head side oil chamber a of 4b, and presses against the inner wall of the steel pipe pile 20. At this time, the pressure of the oil chamber a
7, the valve V7 opens and the gripper 3
c, 4c operate. When the pressure in the oil chamber a reaches the set pressure of the sequence valve V8, the valve V8 is opened, and the pressure oil of the accumulator 8a flows through the fourth pilot switching valve V4 to the head-side oil chamber 5b of the excavation jack 5, and excavation is performed. Press the tool 6 down. At this time, the rod side oil chamber 5a
Is stored in the accumulator 8b through the third pilot switching valve V3.

FIG. 5 shows a state where the earth discharging device 1 is lifted.

After the excavation is completed, when the earth discharging device 1 is lifted, a hydraulic pressure is generated in the rod side oil chamber 10a of the actuator 10, and the first to third pilot switching valves V1 to V3 are moved through the pilot circuit L4 to the illustrated positions. Switch to. Therefore, the oil in the head-side oil chambers a of the grippers 3a to 3c and 4a to 4c is urged by the built-in spring, passes through the third pilot switching valve V3, is stored in the accumulator 8c, and is held in the grippers 3a to 3c, 4a to 4c. The fixing of the earth removal device 1 to the steel pipe pile 20 by the above is released. At this time, the flow of oil to the head side oil chamber 5b of the excavation jack 5 is stopped by the first pilot switching valve V1, and the flow of oil from the rod side oil chamber 5a is stopped by the first pilot switching valve V2. .

[0035]

As described above, according to the present invention, the following excellent effects can be obtained. (A) Pressure oil is applied to the accumulator by the operation of the actuator, and the gripper is operated by the pressure oil. Therefore, it is not necessary to supply the pressure oil from the ground with a hose or the like, and the operation becomes easy. (B) The drilling tool can be rotated together with the steel pipe, and a large rotating force can be given. (C) The excavated earth and sand can be easily transported to the ground by releasing the gripper with a drilling tool. (D) It can be automated, and the efficiency of earth removal work improves.

A dedicated rotating device is not required, and a large rotating force can be obtained.

Further, the force of penetrating into the ground is large, and the hard ground can be reliably excavated.

In addition, the handling of a hydraulic hose or the like is not required, and the cordless control is performed. Therefore, the workability can be greatly improved, rapid earth removal can be performed, and the conventional piping,
Wiring is not worn or damaged, and maintenance can be facilitated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a hydraulic circuit diagram when the accumulator is refueled.

FIG. 3 is a hydraulic circuit diagram when the earth discharging device is suspended.

FIG. 4 is a hydraulic circuit diagram when the discharging device reaches the excavated ground.

FIG. 5 is a hydraulic circuit diagram when the earth discharging device is lifted.

[Explanation of symbols]

 V1 ... first pilot switching valve V2 ... second pilot switching valve V3 ... third pilot switching valve V4 ... fourth pilot switching valve V5 ... fifth pilot switching valve V6 ... 6 pilot switching valve V7, V8 ... sequence valve 1 ... earth removal device 2 ... body 3a-3c ... upper gripper 4a-4c ... lower gripper 5 ... excavation jack 5a ... Rod side oil chamber 5b ・ ・ ・ Piston side oil chamber 6 ・ ・ ・ Drilling tool 6a ・ ・ ・ Drilling blade 6b ・ ・ ・ Bucket 7 ・ ・ ・ Operation valve unit 8a ~ 8c ・ ・ ・ Accumulators 9a, 9b ・ ・ ・ Transmission Container 10 Actuator 10a Rod-side oil chamber 20 Steel pipe pile 21 All-casing excavator 22 Hydraulic hose 23 Hydraulic power Unit 24 ・ ・ ・ Sling wire 25 ・ ・ ・ Crawler crane

Claims (1)

(57) [Claims] 1. An excavator in a cast-in-place method for excavating earth excavated by rotating an excavator together with a steel pipe pile using an excavator, wherein the excavator is suspended from a crane via a wire, Has a plurality of grippers protruding around the circumference thereof, an excavating tool provided at the bottom of the main body via a digging jack, and an operation having a valve for operating the gripper and the digging jack at the top of the main body. A valve unit is provided, and further, an accumulator that stores hydraulic oil and an actuator that generates hydraulic pressure when lifted are provided on the main body, and an automatic control unit for the operation valve unit is provided. When lifted, the hydraulic pressure of the actuator holds the accumulator pressure oil, and when the earth removal device reaches the excavation ground, the accumulator pressure oil pushes the gripper. It has a function to open and close the valve of the operation valve unit so that the hydraulic pressure of the actuator releases the gripper when the drilling tool is pressed down against the inner wall of the steel pipe pile and the drilling tool is pushed down and the earth removal device is lifted. Earth removal equipment in the pile method.