JPH02125022A - Drilling machine for caisson - Google Patents

Abstract

PURPOSE:To aim at the powerful revolution of a drilling machine by inserting a pile disposed at the center into the ground, fitting revolving wheels at telescopic arms fixed at the upper part of a drilling machine hanger tube, rotary cutters at the lower ends of drilling arms 10 and hanging an swing member. CONSTITUTION:The lower part of a pile 2 disposed on the center line in a caisson 1 is inserted into the ground 3, stretchable horizontally telescopic arms 6 are fixed radially at the upper part of the hanger tube 4 of a drilling machine. Revolving wheels 2 are then fitted at the tips of the telescopic arms 6, revolving wheel drive units 8 are fixed at the telescopic arms 6, and rotary cutters 12 are fitted at the lower parts of the drilling arms 10 fitted at both sides in the diameter direction of a drilling arm supporting cylinder 9. An elevating swing member 7 formed of the drilling machine hanger tube 4 and the telescopic arms 6 is hangingly supported by means of wire ropes 19. Horizontally drilled surfaces can be thus formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a caisson excavator used for excavating the lower ground within an oven-type caisson.

[Conventional technology]

Conventionally, as an excavator for excavating the lower ground inside an open type caisson, an excavator was inserted into the center of the vertical hole of the caisson and driven into the ground, as disclosed in Japanese Patent Publication No. 62-20352. A holding member for an excavator equipped with a fixing fluid pressure cylinder facing the vertical column is fitted in the vertical column so as to be able to move up and down, and a pinion and an annular driven gear are attached to the lower part of the holding member by a swing drive device. The upper part of the excavating arm, which is equipped with a rotary power lid at the lower part, is rotatably attached to the rotating frame by a horizontal shaft, and the upper part of the excavating arm is rotatably attached to the rotating frame by a horizontal shaft, and the upper part of the excavating arm is rotatably attached to the rotating frame, A caisson excavator is known that has a structure in which a swing frame is connected to a swing frame via a hydraulic cylinder for arm rotation.

(Problems to be Solved by the Invention) In the case of the conventional caisson excavator, the excavator arm is rotated to perform excavation with the excavator holding member fixed to the vertical column, so the excavation surface is There is a problem in that it is not possible to excavate in such a way that a horizontal excavation surface is formed.Also, a large diameter annular driven gear is required to rotate the swivel frame supporting the excavation arm. This increases the manufacturing cost of the swivel device, and since the middle part of the vertical column is not supported by the caisson, it is difficult to cast the vertical column so that it is accurately positioned in the center of the vertical hole of the caisson. Moreover, when the caisson is lowered into the ground by alternately excavating the ground below the caisson and driving the vertical columns, there is a problem in that the vertical columns tend to deviate from the center of the vertical hole of the caisson.

This invention is capable of excavating the ground under a caisson so that a substantially horizontal excavation surface is formed, and also has piles placed on the center line of the caisson to support the excavator to prevent it from moving laterally. The object of the present invention is to provide a caisson excavator that can be held in place and that can powerfully turn the excavator using muscular means.

[Means to solve the problem]

In order to achieve the above object, in the caisson excavator of the present invention, the lower part of the shaft 2 disposed on the center line inside the caisson 1 is connected to the ground of the lower part of the caisson 1! Three or more horizontal telescoping arms 6 equipped with telescoping drive devices 5 are installed in a radial manner at the top of an excavator support pipe 4 which is inserted into the shaft 3 and is fitted so as to be able to move up and down and rotate freely relative to the shaft 2. A swing wheel 7 that is pressed against the inner peripheral surface of the caisson is attached to the tip of each telescoping arm 6, and a swing wheel drive device 8 is fixed to at least one telescoping arm 6 to support the excavator. The upper end of an excavating arm 10 is pivotally connected by a horizontal shaft 11 to both sides in the diametrical direction of an excavating arm support tube 9 that is fitted into the middle part of the pipe 4 so as to be able to move up and down. A support member I3 to which a rotary cutter 12 rotated by a drive device is attached and fixed to the lower end of the excavator support pipe 4 and the intermediate portion of each excavation arm 10 are connected via an arm support link 14. , the piston rod of the excavator arm opening/closing hydraulic cylinder 15 fixed to the excavator support tube 4 between the excavation arm support tube 9 and the support member 13 and the intermediate portion of the arm support link 14 are connected to the excavation arm opening/closing operation. An elevating and lowering rotating member 1 that is connected via a link 16 and is made up of the excavator support pipe 4 and a telescoping arm 6 fixed thereto.
7 is suspended and supported by a wire rope 19 of a hoist 18.

[For production]

When the swing wheel drive device 8 is operated, each telescoping arm 6, the excavator support pipe 4, and the excavator attached thereto are pivoted. When the hydraulic cylinder 15 for opening and closing the excavation arm is expanded and contracted,
A link 16 for opening and closing the excavation arm by the hydraulic cylinder 15. Excavation arm lo via arm support link 14
is pressed and rotated or pulled and rotated, and the rotary cutter 12 is moved approximately horizontally in a direction away from the resist 2 or in a direction toward the pile 2. Further, the drag 2 is held at a central position within the caisson 1 by the excavator support tube 4 to which three or more telescopic arms 6 are fixed.

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

The drawing shows one embodiment of the present invention, in which a shaft 2 made of steel pipe piles is arranged on the center line of a circular concrete caisson 1, and the lower part of the shaft 2 is placed in the ground 3 below the caisson 1. The guide pipe 20 is inserted into the pile 2, and the excavator support pipe 4 is fitted to the outside of the guide pipe 20 so as to be able to move up and down and rotate. 3 or more placed (4 in the case shown)
The base end of the main arm 21 is fixed, and the main arm 21 and a movable arm 22 slidably fitted thereto are connected via an expansion/contraction drive device 5 consisting of a hydraulic cylinder. A telescoping arm 6 is configured, and the excavator support pipe 4
An elevating/lowering rotating member 17 is constituted by the extensible arm 6 fixed thereto.

A swing wheel 7 having a rubber tire that is pressed against the inner peripheral surface of the caisson is rotatably attached to the tip of each movable arm 22 by a vertical shaft, and at least one swing wheel 7 (in the case shown, the diameter of the excavator support pipe 4 A swing wheel drive device 8 consisting of an electric motor with a speed reducer is fixed to the movable arm 22 of the two telescopic arms 6 located on a line, and the swing wheel drive device 8 transmits a signal through a gear transmission mechanism (not shown). The turning wheel 7 is rotated.

An excavation arm support tube 9 is fitted into the middle part of the excavator support tube 4 so as to be able to move up and down and not rotate, and the upper end of the excavation arm 10 is placed on both sides of the excavation arm support tube 9 in the diametrical direction. A pair of drum-shaped rotary counters 12 are attached to the lower end of the excavating arm 10, which are pivotally connected by a shaft 11 and rotated by a cutter drive device (not shown) consisting of an electric motor with a filter or an oil motor. , and the cylindrical support member 13 fixed to the lower end of the excavator support pipe 4 and the intermediate portion of each excavation arm 10 are connected to the arm support link 14.
A bracket 23 is fixed to the excavator support tube 4 between the excavation arm support tube 9 and the support member 13, and the lower end of the hydraulic cylinder 15 for opening and closing the excavation arm extends in the vertical direction. is fixed to the tip of the bracket 23.

The intermediate portion between the piston rod of the hydraulic cylinder 15 and the arm support link 14 is a link 16 for opening/closing the excavation arm.
An excavation arm support tube 9 is connected to the excavator support tube 4 through the excavator support tube 4 so as to be movable up and down, and an excavation arm 1 with a rotary cutter 12 pivotally connected to the excavation arm support tube 9.
0, an arm support link 14 that connects the support member 13 and the intermediate portion of the excavation arm 10, and an excavation arm opening/closing operation link 16 that connects the excavation arm opening/closing hydraulic cylinder 15 and the intermediate portion of the arm support link 14. The excavator 24 is configured by:

A metal suction pipe 25 having a suction port opening toward the rotary cutter 12 is fixed to each excavation arm 10, and the suction pipe 25 and the suction port of the mud removal pump 26 fixed to the main arm 21 are connected to each other. A discharge hose (not shown) connected via the suction hose 27 and connected to the discharge port of the pump 26 is led to the ground.

Both ends of the support beam 28 extending in the diametrical direction of the caisson 1 are placed on the upper end of the caisson 1 and removably fixed by anchor bolts 29, and are connected to the guide tube 20.
The upper part of the support beam 28 is inserted into the support beam 28.
8, the hoisting machine 1 is installed on both sides of the guide tube 20 in the diametrical direction.
8 is fixed and an upper sheave 30 is attached thereto, and the upper sheave 30 is attached to a support fitting 31 fixed to the upper end of the excavator support pipe 4 or the upper base end of the telescoping arm 6.
A lower sheave 32 is attached below 0, and the wire rope 19 let out from the drum of the hoist 18 is wound around the upper sheave 30 and the lower sheave 32,
Further, the end of the wire row 119 is connected to the support beam 2 or the support metal fitting 31, and when the elevating/lowering turning member 17 and the excavator 24 are moved up and down, the telescopic arm 6 is shortened and the hoisting [1B] Perform hoisting or lowering operation.

Hanging fittings 33 for lifting and transportation are fixed to both sides of the support beam 28 in the longitudinal direction, and a vibratory pile driver 34 is mounted on the upper end of the shaft 2.

When excavating the ground 3 at the bottom of the caisson 1, extend the telescopic arm 6, bring the swing wheel 7 into pressure contact with the inner peripheral surface of the caisson 1, and rotate the rotary cutter 12 to open and close the excavation arm. By extending or shortening the hydraulic cylinder 15, the rotary cutter 12 is moved substantially horizontally in a direction away from the resist 2 or in a direction toward the pile 2. When moving the rotary cutter 12 in the circumferential direction of the pile 2, the turning wheel drive device 8 is operated to turn the lifting turning member 17 and the excavator 24 supported thereby. The ground around the entire circumference of the shaft 2 can be excavated by rotating the lifting/lowering turning member 17 by about 180°.

After the excavation by the excavator 24 reaches an appropriate depth, an appropriate amount of piles 2 are driven by the vibrating pile driver 34, and the excavation by the excavator 24 and the driving of the piles 2 are repeated alternately.

Incidentally, the excavation may be performed by appropriately combining the movement of the rotary cutter 12 in the caisson radial direction by the expansion and contraction operation of the hydraulic cylinder 15 for opening and closing the excavation arm, and the rotation of the rotary cutter 12 by the operation of the swing wheel drive device 8.

In the case of the embodiment described above, the pile 2 can be driven at any time during excavation by the excavator or while excavation is stopped.

When implementing this invention, the guide tube 20 may be omitted and the excavator support tube 4 may be directly fitted to the shaft 2.

(Effects of the Invention) Since the present invention is configured as described above, it produces the following effects.

When the excavating arm opening/closing hydraulic cylinder 15 is extended with each telescoping arm 6 extended and the turning wheel 7 pressed against the inner peripheral surface of the caisson 1, the excavating arm opening/closing operation link 16 is extended by the hydraulic cylinder 15. The excavating arm 10 is pressed and rotated via the arm support link 14, and the excavating arm support tube 9 is moved downward, so the rotary cutter 12 is moved substantially horizontally in the direction away from the pile, and the excavating arm When the opening/closing hydraulic cylinder 15 is shortened, the excavating arm opening/closing operation link 16.
As the excavation arm 10 is towed and rotated via the arm support link 14, and the excavation arm support tube 9 is moved upward, the rotary cutter 12 is moved almost horizontally in the direction approaching the shaft 2, and the rotating wheel When the drive device 8 is operated, the excavator 24 is rotated horizontally, so that the ground 3 under the caisson 1 can be excavated so as to form a horizontal excavation surface.

In addition, when each telescopic arm is extended, the resistor 2 is connected to the caisson l.
By driving the pile 2 in this state, the resistor 2 for supporting the excavator 24 so as not to move laterally is always placed at the center of the caisson 1 and the ground 3 In addition, the excavator can be turned powerfully by simple means.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially longitudinal side view showing the excavator inside the caisson in a reduced state, and Fig. 2 shows the excavator inside the caisson in an expanded state. 3 is a partially longitudinal side view showing an enlarged part of FIG. 2; FIG. 4 is an enlarged sectional view taken along line A-A in FIG. 1; FIG. is an enlarged sectional view taken along the line B-B in Fig. 1, Fig. 6 is a partially cutaway sectional view taken along the line C-C in Fig. 2, and Fig. 7 is a cross-sectional plan view showing an enlarged part of Fig. 6. be. In the figure, 1 is a caisson, 2 is a pile, 3 is the ground, 4 is an excavator support pipe, 5 is a telescopic drive device, 6 is a telescopic arm, 7
8 is a swing wheel, 8 is a swing wheel drive device, 9 is an excavation arm support tube, 10 is an excavation arm, 11 is a horizontal shaft, 12 is a rotary cutter, 13 is a support member, 14 is an arm support link, 15 is for opening and closing the excavation arm A hydraulic cylinder, 16 a link for opening and closing the excavation arm, 17 a lifting/lowering rotating member, 18 a hoisting machine, 1
9 is a wire rope, 20 is a guide tube, 21 is a main arm,
22 is a movable arm, 24 is an excavator, 28 is a support beam,
30 is an upper sheave, 32 is a lower sheave, and 34 is a vibratory pile driver.

Claims (1)

[Claims] The lower part of the pile 2 placed on the center line inside the caisson 1 is inserted into the ground 3 at the bottom of the caisson 1, and the upper part of the excavator support pipe 4 is fitted to the pile 2 so that it can move up and down and rotate freely. , three or more horizontal telescoping arms 6 equipped with telescoping drive devices 5 are fixed radially, and a swing wheel 7 is attached to the tip of each telescoping arm 6 to be pressed against the inner peripheral surface of the caisson, A swing wheel drive device 8 is fixed to at least one telescoping arm 6, and excavation arms 10 are mounted on both sides of an excavation arm support tube 9 in the diametrical direction, which is fitted into the middle part of the excavator support tube 4 so as to be able to move up and down. The upper end of the excavator arm 10 is pivoted by a horizontal shaft 11, a rotary cutter 12 rotated by a cutter drive device is attached to the lower end of the excavation arm 10, and a support member 13 is fixed to the lower end of the excavator support pipe 4. and the middle part of each excavation arm 10 are connected via an arm support link 14, and an excavation arm opening/closing liquid fixed to the excavator support tube 4 between the excavator support tube 9 and the support member 13. The piston rod of the pressure cylinder 15 and the intermediate part of the arm support link 14 are connected via a link 16 for operating the excavator arm opening/closing operation, and the lifting/lowering rotation is made up of the excavator support pipe 4 and the telescopic arm 6 fixed thereto. A caisson excavator in which a member 17 is suspended and supported by a wire rope 19 of a hoist 18.