JPH0434232Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a shaft excavation device equipped with a casing that is press-fitted into the ground substantially vertically and a rotary excavation bucket that can be moved up and down within the casing.

<Conventional Technology> Conventionally, known methods for excavating a shaft include the Benaut method, the reverse circulation method, and the earth drill method. In the Benaut method, the casing is press-fitted into the ground, a grab bucket is dropped into the casing from a tower assembled on the ground, the ground is excavated, and the excavated soil stored in the grab bucket is lifted up with a winch and discharged to the ground. It is. In addition, the reverse circulation method involves inserting a drill pipe with a bit blade attached to the tip into a shaft filled with water, rotating this drill pipe on a rotary table above ground to excavate the bottom of the shaft, and excavating soil. The water is sucked up and discharged together with water by a suction pump on the ground through the drill pipe. Furthermore, in the earth drilling method, a long Kelly bar with a drilling bucket attached to the tip is suspended from the boom of a self-propelled excavator on the ground, and the earth drill is rotated by the excavator to excavate the ground. Excavated soil stored in a bucket is discharged to the ground.

<Problems to be solved by the invention> However, the conventional venot method involves dropping a grab bucket to the bottom of a shaft and using the impact force of the drop to excavate, which causes vibrations when the grab bucket is dropped. In addition, it requires the construction of a tall tower, which means that it cannot be used in places where the overhead space is limited. The conventional reverse circulation method requires the installation of a considerable amount of treatment equipment on the ground for the discharged muddy water, which means that it cannot be used in places where the construction area is narrow and limited. Furthermore, the conventional earth drill method requires a large self-propelled excavator and a long kelly bar on the ground, which means that considerable noise is generated when the excavator is driven, which causes anxiety to local residents, and it also has the disadvantage that it cannot be used in places where the overhead space is limited due to the long boom of the self-propelled excavator.

Therefore, the purpose of this invention is to significantly reduce the vibration and noise associated with excavation, not to cause anxiety to local residents, and to be easily applicable to places where the construction area and the space above it are narrow and restricted. The purpose of the present invention is to provide a shaft excavation device that can perform the following operations.

<Means for Solving the Problems> In order to achieve the above object, the shaft excavation equipment of the present invention has a rotary excavation bucket that is moved up and down within the casing, and has a rotation drive having a reaction force bracket on the outer circumferential surface of the rotary excavation bucket. While the devices are connected and arranged in the casing, a reaction force receiver is provided on the inner circumferential surface of the casing to lock the bracket in the circumferential direction, and at least one of the bracket or the reaction force receiver is The rotary drive device is tilted downwardly with respect to the generatrix of the rotary drive device or the casing and in a direction opposite to the direction of rotation of the rotary excavation bucket so that the rotary drive device is moved forward in the axial direction when driving the rotary excavation bucket cart. It is characterized by being extended.

<Operation> The casing is sequentially press-fitted approximately vertically into the ground using, for example, an oscillating press-fitting device installed on the ground, and an integrally connected rotary shaft is installed at the bottom of the shaft formed in the space inside the casing. An excavation bucket and a rotary drive are arranged. The reaction bracket on the outer periphery of the rotational drive device is locked in the circumferential direction by a reaction force receiver provided on the inner peripheral surface of the casing,
The rotary excavation bucket and the rotary drive device are raised and lowered by a winch on the ground, for example, via a wire rope fixed to the upper end of the rotary drive device. now,
When the rotary drive device is started, the rotary excavation bucket is driven to rotate to excavate the bottom of the shaft and store the excavated earth and sand in the bucket. At this time, the rotary drive device is held non-rotatably on the inner peripheral surface of the casing via a reaction bracket and a reaction force receiver, so it does not rotate together with the rotating rotary excavation bucket. The excavation will be carried out reliably.

Furthermore, since at least one of the bracket or the reaction force receiver is inclined with respect to the generatrix of the rotary drive device or the casing, the reverse rotational force that acts as a reaction on the rotary drive device that drives the rotary excavation bucket is applied to this device and the reaction force receiver. It acts to push and advance the rotary excavation bucket in the excavation direction (vertically downward). When the inside of the bucket is filled with excavated soil, the rotary drive device is stopped, and then the rotary excavation bucket and the rotary drive device are lifted together with a winch, and the excavated soil is discharged to the ground.

Therefore, even if the bottom of the shaft to be excavated is hard, the excavation can be carried out reliably without rotation, and the rotary excavation bucket and the rotary drive device can be reliably prevented from flying up due to the repulsive force from the ground.

<Example> Hereinafter, the present invention will be explained in detail with reference to the illustrated example.

FIG. 1 is a vertical cross-sectional view of a shaft including the shaft excavation equipment of the present invention, in which 1 is the ground, 2 is a casing made of a steel pipe that is vertically press-fitted into the ground 1, and 3 is installed on the ground. A rocking propulsion device that grips the outer periphery of the upper end and presses it into or pulls it out of the ground while rocking it; 4 is a rotary excavator that excavates the bottom 5a of the shaft 5 formed in the space inside the casing 2; The rotary excavation bucket 6 has an output shaft 20 connected to the rotating shaft 19 at the top of the rotary excavation bucket 4.
A hydraulic motor serving as a rotary drive device is connected and arranged in the shaft 5, and 7 is a pair of reaction force motors installed at radially opposite positions on the outer periphery of the hydraulic motor 6 and extending in the axial direction. , 8 is a pair of reaction force receivers extending in the axial direction and fixed opposite to the inner circumferential surface of the casing 2 so as to circumferentially lock the bracket 7; 9 is the center of the upper end of the hydraulic motor 6; A wire rope 11 has one end fixed to a hanging device 10 attached to the crane; 11 is a crane installed on the ground that winds up and lets out the wire rope 9 to raise and lower the rotary excavation bucket 4; 12 supplies and discharges hydraulic oil to the hydraulic motor 6; It is a hydraulic hose.

FIG. 2 is a partial detailed view of the excavation part of the shaft excavation apparatus shown in FIG. 1, and FIG. 3 is a sectional view taken along the line -- in FIG. 2. The rotary excavation bucket 4 has a number of excavation bits 17, 1 on the surface at the lower end of a cylindrical case 15.
The output shaft 20 of the hydraulic motor 6 is fitted into a rotary shaft 19 protruding from the center of a top lid 18 that covers the upper end, while a conical bottom lid 16 having a conical shape 7, ... is pivotally mounted so as to be openable and closable. The two shafts are connected by a pin 21, and are driven to rotate in the direction shown by arrow A to the shaft bottom 5.
A is excavated and the excavated earth and sand is stored in the case 15. Moreover, the hydraulic motor 6 is
An output shaft 20 is fixed in a cylindrical case 22 having inspection windows 23, 23, . . . and protrudes downward.
The base of the hanger 10 is supported by a built-in bearing (not shown), and the hanger 10 is pivotally connected to brackets 24, 24 at the upper end of the case with pins 30. The pair of reaction force brackets 7 have a rectangular base plate 2 with an arcuate cross section circumscribing the case 22.
5, a contact plate 26 extending downward in the longitudinal direction of the base plate 25, that is, the generatrix of the case 22 at an angle of θ° in a direction opposite to the rotational direction of the rotary excavation bucket 4; It consists of a reinforcing rib 27 fixed to one side of the plate 26 at a predetermined interval, and is fixed to the outer periphery of the case 22 in the axial direction with bolts 28, 28, . . . . On the other hand, the pair of reaction force receivers 8 are placed at positions corresponding to the hydraulic motor 6 on the inner circumferential surface of the casing 2 at an angle of θ° with respect to the generatrix of the casing 2 so as to be longer than the contact plate 26. A hydraulic motor 6 is installed to rotate the rotary excavation bucket 4 in the direction of arrow A.
When it rotates around the wire rope 9 in the direction of arrow B due to the reaction force, it comes into contact with the entire surface of the abutting plate 26 of the bracket 7 to prevent the rotation, and the hydraulic motor 6 is rotated in the axial direction in the direction of arrow C. It seems like it is moving forward. The inclination angle θ of the contact plate 26 and the reaction force receiver 8 is, for example, about 5°. Further, the hydraulic hose 12 supplies and discharges hydraulic oil to the internal hydraulic motor through hose holes 29, 29 (see FIG. 3) at the upper end of the casing 22.

The operation of the shaft excavating apparatus having the above configuration will be described below with reference to FIG.

The outer periphery of the upper end of the casing 2 is gripped by a rocking propulsion device 3 installed on the ground, and is pressed vertically into the ground while being rocked, and as the shaft 5 is excavated, the upper end of the casing 2 Steel pipes of fixed length are successively joined with bolts, etc. A hydraulic motor 6 suspended from a crane 11 on the ground via a wire rope 9 and a rotary excavation bucket 4 connected to the lower part of the motor 6 are lowered to the shaft bottom 5a by the wire rope 9, and are then lowered to the shaft bottom 5a via a hydraulic hose 12. Hydraulic oil is supplied to the hydraulic motor 6. Then, the hydraulic motor 6 starts and rotates the rotary excavation bucket 4 as shown by arrow A in FIG. be done. At this time, the hydraulic motor 6, which attempts to rotate as shown by arrow B in FIG. The entire surface abuts against the receiver 8 and rotation is prevented, and since the contact plate 26 and the reaction force receiver 8 are inclined at θ° with respect to the axial direction, they are pressed and moved forward in the direction of arrow C in Fig. 2. It will be done. Therefore, even if the bottom of the shaft is hard, the rotary excavation bucket 4 and the hydraulic motor 6 are reliably prevented from flying upward due to the repulsive force from the ground, and the reaction force receiver 8 is directed in such a way that it does not support the weight of the hydraulic motor 6, etc. Therefore, the weight of the hydraulic motor 6 etc. can be used more effectively as a pressing force for excavation than when the contact plate and the reaction force receiver are arranged in the axial direction (θ°=0). In this way, once the inside of the rotary excavation bucket 4 is filled with excavated soil,
The hydraulic motor 6 is stopped, and then the wire rope 9 is wound up with the crane 11 and the rotary excavation bucket 4 is moved.
is hoisted to the ground together with the hydraulic motor 6, and the bottom cover 16 of the bucket (see FIG. 2) is opened to discharge the excavated earth and sand into an earth removal hopper or the like.

Note that when the hydraulic motor 6 is used in a casing with a larger inner diameter, a bracket 7 is installed for reaction force.
base plate 25 and case 2 of hydraulic motor 6
A spacer may be appropriately interposed between the two.

According to the shaft excavation device of the present invention, the rotary drive device 6 is directly connected to the rotary excavation bucket 4, and the shaft bottom 5
Since the excavation is carried out by driving the excavator in a, it does not require a large construction area on the ground or a high overhead space unlike conventional construction methods, and the noise associated with the drive can be significantly reduced. Airplanes and long Kerry bars do not cause any anxiety to local residents.

Note that the lifting device for the rotary excavation bucket of the present invention is not limited to the crane 11 of the above embodiment, but especially when there is a restriction on the upper space, it may be a short platform equipped with a winch and running on ground rails. You can. It goes without saying that the rotary drive device is not limited to a hydraulic motor, and the number of reaction force brackets and reaction force receivers is not limited to one pair.

<Effects of the invention> As is clear from the above explanation, the shaft excavation equipment of the present invention has a reaction force bracket on the outer circumferential surface of the rotary excavation bucket that is raised and lowered within the casing that is press-fitted into the ground. A rotational drive device having a rotary drive device is connected and arranged in the casing, and a reaction force receiver is provided on the inner circumferential surface of the casing to lock the bracket in the circumferential direction, and either the bracket or the reaction force receiver is provided on the inner peripheral surface of the casing. The rotary excavation bucket extends downward with respect to the generatrix of the casing, etc., and is inclined in the opposite direction to the rotational direction of the rotary excavation bucket, so that the rotary excavation bucket can be moved forward in the axial direction when the rotary excavation bucket is driven. In addition to preventing the reverse rotation that acts on the equipment as a reaction to excavation, this reverse rotation force can be used as the driving force for excavation. Even with a simple and inexpensive structure, even hard ground can be excavated efficiently. It can significantly reduce ground vibration and noise, does not cause anxiety to local residents, and can be easily applied to places where the construction area or the space above it is narrow and restricted.
It has a remarkable effect on shaft excavation.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a shaft including the shaft excavation equipment of the present invention, Fig. 2 is a partial detailed view of the excavation part of the shaft excavation equipment of Fig. 1, and Fig. 3 is a sectional view taken along the line - - of Fig. 2. be. DESCRIPTION OF SYMBOLS 1... Ground, 2... Casing, 3... Rocking propulsion device, 4... Rotary excavation bucket, 5... Shaft, 6... Hydraulic motor, 7... Bracket, 8...
... Reaction force receiver, 9 ... Wire rope, 10 ... Hanging tool,
11... Crane.

Claims (1)

[Scope of Claim for Utility Model Registration] In a shaft excavation device equipped with a casing and a rotary excavation bucket that can be moved up and down within the casing, a shaft excavator is provided within the casing that is connected to the upper part of the rotary excavation bucket and has a reaction force on the outer peripheral surface. A rotary drive device having a bracket is disposed, and a reaction force receiver is provided on the inner circumferential surface of the casing to lock the bracket in the circumferential direction, and at least one of the bracket or the reaction force receiver is attached to the inner peripheral surface of the casing. The rotary drive device is oriented downwardly with respect to the generatrix of the rotary drive device or the casing and is inclined in a direction opposite to the direction of rotation of the rotary excavation bucket so that the rotary drive device is moved forward in the axial direction when driving the rotary excavation bucket cart. A vertical shaft excavation device characterized by an extended installation.