JPH0473494B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an excavation device used for sinking a caisson such as a pneumatic caisson.

[Prior art]

Conventionally, as a drilling device used in the caisson construction method, as disclosed in Japanese Patent Publication No. 59-48253, an L-type excavation device has a large number of excavation buckets in the opening provided in the center of the slab of a circular caisson. Two sets of circular guide rails are fixed to the lower surface of the slab, and the chain is conveyed through cylinders by two running frames having rollers running along the circular guide rails. In addition to suspending and supporting the horizontal portion of the conveyor, a traveling drive device is provided on one of the running frames, and the vertical portion of the chain conveyor is suspended and supported via a cylinder by the rotating frame of the rotating device provided in the center of the slab. It is known that the structure is as follows.

[Problem that the invention seeks to solve]

However, in the case of the conventional excavation equipment for caisson construction, two sets of circular guide rails are fixed to the underside of the caisson slab, and the cylinder is moved by two running frames having rollers that run along the circular guide rails. Since the chain conveyor must be suspended and supported through the frame and a traveling drive device must be provided on one of the traveling frames, an L-shaped chain conveyor requires a suspension support traveling device with a complicated structure and has a large number of excavation buckets. The system includes a pair of circulation guide frames with a grooved cross section for circulating a plurality of rollers attached to both sides of the width direction of each excavation bucket in an L-shape, and a chain driven in circulation by a circulation drive device. This structure requires a chain conveyor with a complex and expensive excavation bucket, and furthermore, the soil that falls from the excavation bucket during excavation and discharge may adhere to the grooves of the circulation guide frame or the rollers of the excavation bucket. Therefore, the excavation bucket may not be able to circulate smoothly.

[Purpose and structure of the invention]

The purpose of this invention is to provide an excavation device for caisson construction that can advantageously solve the above-mentioned problems, and the gist of this invention is to:
A vertical clam shell passage forming and cutter supporting tube shaft 3 which is rotated by a turning drive device 1 and moved up and down by a lifting hydraulic cylinder 2 is provided passing through a slab 5 of a caisson 4. Holding frame 6 fixed to the lower end of 3
A cutter drive device 7 is fixed to the base end of a helical drum cutter 8 extending laterally from the lower end of the tube shaft 3 to a drive shaft 9 of the cutter drive device 7.
Excavation for caisson construction method, characterized in that the cutter drive device 7 and the helical drum cutter 8 have their proximal ends deviated laterally from the downward extension of the space within the tube shaft 3. It's in the device.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

1 to 6 show an embodiment of the present invention, and show an excavation chamber 10 in a caisson 4.
The lower part of the cylindrical part of the support frame 12 is fitted into the opening 11 provided in the slab 5 of the ceiling, and the support frame 12 is fixed to the slab 5 with bolts 13, and The lower part of the vertical rotation reaction force support member 14 is fixed to the support frame 12, and the cylindrical part of the elevating frame 16 is slidably fitted into slide bearings 15 attached to the upper and lower parts of the support frame 12. The elevating frame 16 and the support frame 12 are connected via an elevating hydraulic cylinder 2.

A rotating cylinder 18 is rotatably fitted in rotation bearings 17 attached to the upper and lower parts of the lifting frame 16, and the upper flange of the rotating cylinder 18 and the upper end of the cylindrical portion of the lifting frame 16 are connected to each other. A thrust bearing 19 is interposed therebetween, and a large-diameter driven gear 20 is integrally provided at the upper end of the rotating cylinder 18. An electric motor 21 and a planetary gear reducer 22 are mounted on the upper part of the elevating frame 16. The driving pinion 23 fixed to the output shaft of the reducer 22 is meshed with the driven gear 20, and the swinging reaction force supporting engagement fixed to the upper part of the lifting frame 16 is fixed. The mating member 24 is slidably fitted to the turning reaction force supporting member 14.

An intermediate portion of a tube shaft 3 for forming a clamshell passageway and supporting a cutter having a circular cross section is fitted into the rotating cylinder 18 and joined together by welding or the like, and a holding frame 6 is fixed to the lower end of the tube shaft 3. A helical vane 26 is fixed to the outer periphery of a cutter shaft 25 made of a horizontally tapered tube extending laterally, and a large number of picks 27 are attached to the outer periphery of the helical vane 26. A helical drum cutter 8 is constructed, and a cutter drive device 7 consisting of an electric motor 28 and a planetary gear reducer 29 is fixed to the holding frame 6 and
A drive shaft 9 fixed to the output part of the helical drum cutter 8 is inserted into and fixed to the large diameter end of the cutter shaft 25 of the helical drum cutter 8, and is fixed to the holding frame 6, the cutter driving device 7, and the base end of the helical drum cutter 8. This means that the helical drum cutter 8 is located laterally offset from the downward extension of the space within the tube shaft 3 and is lower than the annular gate seat 30 fixed to the lower end of the tube shaft 3. placed on the level.

A vertical shaft 32 fixed to a gate 31 that opens and closes the lower end of the tube shaft 3 is rotatably fitted to the holding frame 6, and an arm 33 fixed to the vertical shaft 32 and the holding frame 6 are connected to each other. The lower part of the vertical clam shell lifting/lowering conduit 35 connected via the gate rotation hydraulic cylinder 34 is fixed to a pedestal 36 fixed to the slab 5, and fixed to the lower end of the conduit 35. The upper part of the pipe shaft 3 is slidably inserted into the seal ring 37, and a support base 38 fixed to the upper end of the pipe line 35 has a hoist 39 for lifting and lowering the clam shell and a hoist for opening and closing the clam shell. The machine 40 is fixed, and the circular clam shell 41 is connected to a rope 43 hanging down from a lifting drum 42 provided at the upper part of the pipe 35, and the drum of the clam shell opening/closing hoist 40 is also connected to the rope 43. Provided at the upper part of the pipe line 35, the pipe line 35
An on-off valve 45 for air supply and exhaust is attached to a lid 44 fixed to the upper end of the
is connected.

A rotary feeder 4 is installed in the middle of the pipe line 35.
6 is connected to the upper end of a screw conveyor 51 consisting of an inclined pipe body 48 and a screw conveyor 50 accommodated therein and rotated by a drive device 49. , the lower end of the discharge chute 47 is connected, and the lower end of the screw conveyor 51 is connected to a chute 54 equipped with a gate 53 that is opened and closed by an opening/closing hydraulic cylinder 52. A horizontal shaft fixed to the lower part of the damper 55 is rotatably attached to the lower part of the connection between the pipe line 35 and the discharge chute 47, and an arm 56 fixed to the horizontal shaft and fixed to the pipe line 35 are attached. It is connected to the attached bracket via a damper switching hydraulic cylinder 55.

When lowering caisson 4, gate 3
1 is opened and compressed air is supplied and pressurized into the excavation chamber 10, while the helical drum cutter 8 is rotated in the direction of arrow B by the cutter drive device 7, the lifting hydraulic cylinder 2 is shortened. The helical drum cutter 8 is moved downward via the lifting frame 16, the rotating cylinder 18, the tube shaft 3, and the holding frame 6, and the ground 58 under the helical drum cutter 8 is excavated to an appropriate depth.
The excavated earth and sand are transferred below the tube shaft 3 by the helical vane 26, and then the rotation drive device 1 rotates the rotation cylinder 18 and the tube shaft 3 via the drive pinion 23 and the driven gear 20, and the tube The helical drum cutter 8 is rotated by the shaft 3 via the holding frame 6, and the rotation (autorotation) and rotation of the helical drum cutter 8 causes the ground 58 in the lower part of the excavation chamber 10 to be moved around the center extension line of the tube shaft 3. The pipe is excavated in a circular manner, and the excavated soil is transferred below the pipe shaft 3 by the helical vane 26.

Also, the excavated earth and sand 59 transferred below the tube shaft 3
When discharging excavated earth and sand, the excavated earth and sand 59 is grabbed by the clam shell 41 and lifted up, and after the clam shell 41 passes through the part of the damper 55 placed in a vertical position, the damper 55 is moved along the dotted line in FIG. Rotate the damper 55 to the inclined position shown in
The middle part of the clam shell elevating pipe 35 is shut off, and then the clam shell 41 is opened, and the excavated earth and sand that has fallen from the clam shell 41 is passed through the damper 55, the discharge chute 47, and the rotary feeder 46 to the screw conveyor. 51, and then the damper 55 is rotated to the vertical position shown by the two-dot chain line, and then the clam shell 41 is moved downward. Also, open the gate 53 and shoot 5.
The excavated earth and sand are supplied from the screw conveyor 51 to the bucket 60 placed at the bottom of the bucket 60, and when the excavated earth and sand are supplied into the bucket 60 until it is full, the gate 53 is closed and the above-mentioned The operation is repeated to discharge the excavated earth and sand from the lower part of the tube shaft 3.

After rotating the helical drum cutter 8 by 360 degrees, the helical drum cutter 8 is moved downward by the shortening operation of the lifting hydraulic cylinder 2, and the ground 58 under the helical drum cutter 8 is excavated to an appropriate depth. Next, helical drum cutter 8
Rotate 360° again.

After excavating by the stroke of the lifting hydraulic cylinder 2 as described above, the helical drum cutter 8 is moved by the extension operation of the lifting hydraulic cylinder 2.
is moved upward, and then the pressure inside the excavation chamber 10 is reduced to sink the caisson 4.

Next, excavation by rotating and pivoting the helical drum cutter 8 and discharge of the excavated earth and sand are performed again as described above.

If the caisson 4 is circular, the excavation device is installed in the center of the slab 5. If the caisson 4 is a large square or rectangle, the excavators 62 are installed in two rows as shown in FIG. In this case, since the portion excavated by the helical drum cutter 8 is circular, there will be an unexcavated portion. In order to excavate this unexcavated area,
A ceiling running rail 63 is fixed to the lower surface of the slab, and a telescoping arm 65 is attached to a trolley 64 that runs along the ceiling running rail 63 so as to be able to rotate and move up and down, and a drilling is performed at the tip of the telescoping arm 65. The bucket 66 is attached to form a small auxiliary excavator 67, and the auxiliary excavator 67 excavates the unexcavated portion.

In addition, when inspecting or repairing the earth removal equipment,
After the lower end of the tube shaft 3 is closed by the gate 31, the supply/exhaust on-off valve 45 is opened to reduce the pressure inside the tube shaft 3 and the clam shell elevating conduit 35 to atmospheric pressure,
Perform inspection or repair in this condition.

In the case of the above embodiment, the discharge chute 47 is sealed with the excavated earth and sand filled in the rotary leaf feeder 46 and the screw conveyor 51, and the clam shell 41 is kept in a pressurized state. Since the clam shell 41 only moves up and down within the shaft 3 and the clam shell elevating conduit 35, and there is no need to move the clam shell 41 in and out between the conduit 35 and the atmosphere, there is no outflow loss of pressurized air.

〔Effect of the invention〕

According to the present invention, the vertical clam shell passage forming and cutter supporting tube shaft 3, which is rotated by the rotation drive device 1 and moved up and down by the lifting hydraulic cylinder 2, penetrates the slab 5 of the caisson 4. A cutter driving device 7 is fixed to a holding frame 6 provided and fixed to the lower end of the tube shaft 3, and the proximal end of a helical drum cutter 8 extending laterally from the lower end of the tube shaft 3 is fixed to the holding frame 6. Since it is connected to the drive shaft 9 of the cutter drive device 7, the structure of the excavation equipment is simple, and the helical drum cutter 8 can be smoothly rotated and turned. The proximal end of the tube shaft 3 is disposed so as to be offset laterally from the downward extension of the space within the tube shaft 3, so that excavation by the helical drum cutter 8 and the lower part of the tube shaft 3 for forming a clam shell passage and supporting the cutter are carried out. The clam shell 41 can be moved up and down to discharge the excavated earth and sand while transferring the excavated earth and sand. Therefore, effects such as highly efficient excavation can be obtained.

[Brief explanation of drawings]

Figures 1 to 6 show one embodiment of the present invention, in which Figure 1 is a vertical cross-sectional side view showing an excavation device for caisson construction method and excavated earth and sand discharge device of the present invention, and Figure 2 is a side view of the caisson construction method. FIG. 3 is a vertical sectional side view showing a part of the drilling equipment for construction method in an enlarged manner, FIG. 4 is a vertical sectional front view showing a part of the drilling equipment, and FIG.
A sectional view taken along the line A, FIG. 5 a partially vertical side view showing the support state of the cutter drive device and the helical drum cutter, and FIG. 6 a longitudinal front view showing the state of excavation by the helical drum cutter. FIG. 7 is a schematic bottom view showing how the excavator and auxiliary excavator are installed in a large rectangular caisson. In the figure, 1 is a swing drive device, 2 is a hydraulic cylinder for lifting, 3 is a tube shaft for forming a clam shell passage and supporting a cutter, 4 is a caisson, 5 is a slab, 6 is a holding frame, 7 is a cutter drive device, 8 is a helical drum cutter, 9 is a drive shaft, 10 is an excavation chamber, 1
2 is a support frame, 13 is a bolt, 14 is a turning reaction force support member, 16 is an elevating frame, 18 is a turning cylinder, 20 is a driven gear, 23 is a driving pinion, 24
2 is an engagement member for supporting turning reaction force, 25 is a cutter shaft, 2
6 is a helical vane, 27 is a pick, 31 is a gate, 34 is a hydraulic cylinder for rotating the gate, 35 is a conduit for lifting and lowering the clamshell, 36 is a frame, 37 is a seal ring, 39 is a hoisting machine for lifting and lowering the clamshell, 4
0 is a hoist for opening and closing the clamshell, 41 is a clamshell, 43 is a rope, 46 is a rotary feeder, 47 is a discharge chute, 51 is a screw conveyor, 52 is a hydraulic cylinder for opening and closing, 53 is a gate, and 55 is a damper. , 57 is a hydraulic cylinder for damper switching, 59 is excavated earth and sand, 63 is an overhead traveling rail, and 67 is an auxiliary excavator.

Claims (1)

[Claims] 1. A vertical clamshell passage forming and cutter supporting tube shaft 3 is rotated by a rotation drive device 1 and moved up and down by a lifting hydraulic cylinder 2.
A cutter driving device 7 is fixed to a holding frame 6 that is provided through a slab 5 of the caisson 4 and fixed to the lower end of the tube shaft 3, and a helical cutter drive device 7 is fixed to a holding frame 6 that is provided through the slab 5 of the caisson 4 and is fixed to the lower end of the tube shaft 3. The base end portion of the drum cutter 8 is connected to the drive shaft 9 of the cutter drive device 7, and the base end portions of the cutter drive device 7 and the helical drum cutter 8 extend laterally from the downward extension of the space within the tube shaft 3. A drilling device for caisson construction method characterized by being arranged in an offset manner.