JPH0313399B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an excavator for a pipe propulsion method.

(Prior Art) A pipe propulsion method is one of the construction methods for burying pipes underground. According to this pipe propulsion method, the pipe is generally propelled underground together with the shield excavator by the operation of a propulsion jack as the excavator excavates the ground ahead.

One of the excavators for such a pipe propulsion construction method is disclosed in Japanese Patent Application Laid-open No. 148999/1983. This excavator includes a pair of guide members disposed within and fixed to the shield body and extending in the axial direction of the shield body, and a pair of guide members arranged in the radial direction of the shield body and extending in the axial direction of the shield body via the guide members. a beam slidably supported on the beam; and a beam having a digging bucket attached to its tip and pivotally connected to said beam. This excavator moves the excavating bucket by controlling the operations of a device for moving the beam along a guide member, a device for swinging the boom vertically and laterally, and a device for pivoting the excavating bucket with respect to the boom. It can be moved to a desired position within a certain range, and thereby a certain area of the ground can be mechanically excavated.

By the way, when the beam supporting the boom with the excavation bucket pivotally attached to its tip is in a nearly horizontal position, the beam will not become an obstacle in transferring the shear in the excavation bucket to the conveyor device located below. Therefore, the waste present in the excavation bucket can be easily discharged onto a conveyor device, by which the waste can then be transported rearward. However, while the shield excavator and the following pipe are being propelled, due to uneven propulsion resistance, etc., rolling occurs, rotating around the central axis of the shield excavator and the following pipe, and the beam supported via the guide member fixed to the shield becomes attached to the shield. rotates as one,
When the beam is in an inclined position with a large deviation from the horizontal, the beam becomes an obstacle to releasing the shear in the excavation bucket onto the conveyor system, and easily transfers the shear from the excavation bucket to the conveyor system. Therefore, the excavation work using the excavation bucket took a lot of time, which hindered efficient excavation work.

In addition, in conventional excavators, the conveyor device is supported at the bottom of the pipe independently of the excavator, so each time the excavator bucket is excavated, it is necessary to return the excavator bucket to the discharge position on the conveyor device. It is necessary to reciprocate the beam supporting the boom on which the excavation bucket is installed, and the time required for this reciprocating movement has been an obstacle to efficient excavation work.

(Objective) Therefore, an object of the present invention is to provide a pipe propulsion excavator that is installed inside a pipe being propelled and can efficiently excavate the ground in front of the pipe.

(Structure and Effects) The present invention basically comprises: a boom to which an excavation bucket is pivotally connected; a beam arranged in the radial direction of a pipe and to which the boom is pivotally connected; It is characterized by comprising a pair of guide members extending in the axial direction of the tube so as to be guideably supported thereon, and means for positioning the guide members on the tube so as to be adjustable in the circumferential direction thereof.

According to the present invention, even if the beam is largely tilted from its horizontal position due to rotation of the beam around its central axis by the propulsion of the tube, the position of the pair of guide members supporting the beam can be adjusted around the circumference with respect to the tube. By adjusting the direction, the beam can be returned to a horizontal position. Therefore, the attitude of the beam can be maintained horizontally, and as a result, the beam does not become an obstacle when transferring shear from the excavation bucket to the conveyor device, allowing efficient excavation work.

Furthermore, the invention is characterized in that the conveyor device is supported on the beam so as to be movable integrally with the beam, for example when the beam is advanced to advance the excavation bucket to a forward position. Since the conveyor device moves forward as the beam moves forward, the shear in the excavation bucket can be discharged onto the conveyor device without moving the beam backward. There is no need to reciprocate the beam, which allows for more efficient excavation operations.

(Example) Referring to FIG. 1, a pipe propulsion excavator 10
is installed in a tube 14 that includes a cutting edge member 12. The pipe 14 is propelled by a propulsion jack (not shown) as the excavator 10 excavates the ground 16 in front of the pipe.
propelled underground by

As shown in FIGS. 1 and 2, the excavator 10 includes a pair of guide members 18 (only one of which is shown) extending in the axial direction of the tube at a distance from each other within the tube 14. and a radially arranged beam 20 thereof. Each guide member 18 has a guide groove 22 (see FIG. 2) extending in the longitudinal direction of the guide member on its mutually opposing surfaces. A pair of guide members 18 slidably receive corresponding ends of the beam 20 in guide grooves 22 to support the beam 20 movably in the axial direction of the tube 14 .

The rear end of each guide member 18, that is, the 12 blade openings 12
A pair of first actuating devices 24 made of, for example, a hydraulic cylinder device are arranged between the end located on the side opposite to side a and the corresponding end of the beam 20. One end of each actuator 24 is pivotally connected to a bracket 28 of beam 20 via a pivot 26, and the other end of each actuator 24 is connected to guide member 18.
A pivot 32 is attached to a bracket 30 provided at the rear end.
It is attached via. Therefore, by simultaneous actuation of both actuating devices 24, the beam 20 can be moved in the longitudinal direction of the guide member 18, ie in the axial direction of the tube 14, and the beam 20 can be positioned at the desired position.

At the center of the beam 20, as shown in FIG. 2, a shaft portion 34 is fixedly provided to the beam 20, making a right angle to the beam 20 and extending downward. A connecting portion 36 is rotatably fitted into the shaft portion 34 . A locking portion 34a is provided at the lower end of the shaft portion 34 to prevent the connecting portion 36 from falling. Flanges 38 are provided on both sides of the connecting portion 36, and a bracket 40 for a second actuating device, which will be described later, is fixed to the front surface of each flange 38, and a third actuating device, which will be described later, is fixed to the back surface of each flange 38. A bracket 42 for the actuator is fixed. A base end portion of a boom 46 is pivotally attached to the lower portion of the connecting portion 36 via a horizontal shaft 44 arranged parallel to the beam 20 . Therefore, the boom 46 supported by the beam 20 via the connecting portion 36 can swing vertically around the horizontal axis 44 and can swing laterally around the vertical axis 34. be.

Referring again to FIG. 1, a pair of second actuating devices 48, which are hydraulic cylinder devices, are disposed between the coupling portion 36 and the boom 46. each second
One end of the actuating device 48 is attached to the flange 38 of the connecting portion.
The other end of each second actuating device 48 is pivotally attached to a side of the boom 46 via a pivot 52, and the other end of each second actuator 48 is pivotally attached to a side of the boom 46 via a pivot 52. Therefore, by simultaneous operation of both actuating devices 48, the boom 46 can be swung up and down about the horizontal axis 44, and the boom can be positioned at a desired inclination angle.

Each end of the beam 20 is provided with a support 54 extending partially rearwardly along the guide 18 to which a bracket 56 is secured. One end of a third actuating device 58 consisting of, for example, a hydraulic cylinder device is pivotally connected to this bracket 56 via a pivot shaft 60. The other end of the actuating device 58 is pivotally attached to a bracket 42 provided on the flange 38 of the connecting portion 36 via a pivot shaft 62. Both actuators 58, one of which extends and the other retracts, swing the boom 46 laterally about the shaft 34 and position the boom at its desired angle.

An excavation bucket 64 is pivotally attached to the tip of the boom 46 via a pivot 66 parallel to the horizontal shaft 44 . A fourth actuating device 68 for swinging the excavation bucket cart 64 about a pivot 66 is provided between the excavation bucket cart 64 and the boom 46 . That is, one end of the actuating device 68 is pivotally connected to a bracket 72 provided on the boom via a pivot shaft 70 parallel to the horizontal axis 44, and the other end of the actuating device 68 is connected via a link mechanism 74. It is pivotally connected to the excavation bucket 64. Link mechanism 74
includes a first arcuate link member 74a and a second arcuate link member 74b pivotally connected to the other end of the actuator 68 via a common pivot 76, the other end of the first link member 74a being It is pivotally connected to the excavation bucket 64 via a pivot 78, and the other end of the second link member 74b is connected to the boom 4 via a pivot 80.
It is pivoted to 6. Axis 66, 7 parallel to each other
The line connecting the central axes of 6, 78 and 80 forms a quadrilateral.

The actuator 68 swings the excavating bucket 64 about the pivot 66 by its telescoping action and positions the excavating bucket at a desired angle. Although the other end of the actuating device 68 can be directly pivoted to the excavation bucket cart without using the linkage mechanism 74, by using the linkage mechanism 74, the excavation bucket cart 64
The swing range can be set even larger.

Control unit 82 for controlling the actuation of the first to fourth actuators 24, 48, 58 and 68
is fixed to, for example, the support part 54 so as to be located at the inner upper part of the tube 14. Control unit 82
A control box 84 is connected to the control box 84, and the operation of each of the first to fourth actuating devices 24, 48, 58, and 68 can be controlled by operating the control box 86.
The excavation bucket 64 can be moved to a desired location within a certain range to excavate the ground in front of the cutting edge member 12, and thereby the ground in front of the cutting edge member 12 can be mechanically excavated. .

A conveyor device 88 for transporting the waste excavated by the excavation bucket 64 to the rear is connected to the beam 20.
It is supported by a support part 54 of. Conveyor device 8
In the illustrated example, 8 is a conventionally well-known belt conveyor device comprising a frame 88a and a conveyor belt 88b. The support section is provided with a pair of fixed arms 90 and a pair of swing arms 92 (only one of which is shown) that receives the conveyor device 88. Each fixed arm 90 has a support 5 such that the conveyor device 88 is positioned therebetween.
A frame 88a extends downwardly and rearward integrally from the fixed arm 4, and a frame 88a is provided between the lower ends of the fixed arm.
A support shaft 94 is provided for receiving the lower side part of. The upper ends of the pair of swinging arms 92 are swingably supported by the support section 54 via a pivot 96 so that the conveyor device 88 is positioned between the swinging arms. A support shaft 98 for receiving the lower side of the frame 88a is provided between the lower ends. Therefore, the conveyor device 88 is suspended from the support portion 54 via both arms 90 and 92 so as to be held on the support shafts 94 and 98. The spindle pins 94 and 98 can each be rollers.

Between the fixed arm 90 and the swinging arm 92,
A fifth actuating device 100, for example a hydraulic cylinder device, is provided for swinging the swinging arm. One end of the actuator 100 is attached to a pivot 104 on a bracket 102 provided on the fixed arm 90.
The other end is connected to a pivot 108 to a bracket 106 provided on the swing arm 92.
are connected via. The actuation of the actuating device 100 allows the swinging arm 92 to swing about the pivot 96, thereby causing the frame 88a to swing.
The inclination angle of the conveyor device can be adjusted using the support shaft 94 on which the conveyor device 88 is placed as a fulcrum, and the front end of the conveyor device 88 does not come into contact with the front end of the pipe 14 when the excavator 10 is removed from the pipe 14. In this way, the conveyor device can be held in a substantially horizontal position. The actuating device 98 operates according to the first to fourth
It can be controlled by operating the control box 84 in the same manner as in the actuating device.

Since the conveyor device 88 is suspended from the support portion 54 provided on the beam 20 which is movable in the axial direction of the tube 14, that is, in the front-back direction, the conveyor device 88
It moves integrally with the forward and backward movements of 0. An actuating device 109 made of, for example, a cylinder device can be provided between the fixed arm 90 and the frame 88a to adjust the relative positional relationship between the beam 20 and the conveyor device 88 in the front-back direction. When the conveyor system 88 is in the forward-most position shown in FIG. It is located.

A guide member 18 that guideably supports the beam 20
In the example shown in FIG. 1, a pair of positioning means 112 are arranged at intervals in the axial direction of the tube 14.
It is supported by the tube 14 via. As shown in FIG.
14, and a pressing device 116 disposed between both shoe members 114.

Both shoe members 114 have respective outer surfaces that are connected to the tube 1.
The shoe members 114 are arranged at intervals from each other in the radial direction of the tube so as to be able to come into contact with the inner surface of the tube. Guide members 18 are fixed to the inner surface of the shoe member 114 so as to be parallel to each other. At mutually opposing ends of the pair of shoe members 114, mutually parallel mounting flanges 118 for the pressing device 116 are provided.

In the illustrated example, the pressing device 116 includes bolts 120 disposed through mutually opposing mounting flanges 118 and mutually opposing mounting flanges 11 .
8 and a pair of nuts 122 which are screwed into bolts 120. According to the pressing device 116,
By rotating the pair of nuts 122 in the direction away from each other, the pair of show members 114 can be expanded in the direction away from each other, thereby pushing both show members 114 against the inner surface of the tube 14. . Since the show member 114 pressed against the pipe 14 is fixed to the pipe by frictional engagement, the guide member 1 fixed to the show member 114
8 is fixed to the tube 14 via a shoe member 114. Further, by loosening the nut 122, the pressing force applied to the shoe member 114 toward the tube 14 can be released, thereby making it possible to slide the shoe member 114 in the circumferential direction of the tube 14.

In order to move the shoe member 114 in the circumferential direction of the tube 14, a sixth actuating device 1, for example consisting of a hydraulic cylinder arrangement, is provided between the tube and the shoe member 114.
It is preferable to provide 24. One end of the actuating device 124 is connected via a pivot shaft 126 to one of the show members 114 to which the guide member 18 is fixed, and the other end is connected to one of the show members 114 to which the guide member 18 is fixed, and the other end is connected to the hole by using a grout injection hole 128 provided in the pipe 14. It is connected via a pivot 132 to an anchor pin 130 that is fitted into the anchor pin 130 . Actuation of actuator 124 is controlled by control box 84.
The pair of shoe members 1 can be controlled by the operation of the actuating device 124.
14 can be moved relative to the tube 14 in the circumferential direction of the tube. After this position adjustment, nut 122
By tightening, the position adjustment of the shoe member 114 is completed.

The excavator 10 includes first to fourth actuating devices 2
By controlling the operations of 4, 48, 58 and 68, the excavation bucket 64 can be moved to a desired location within a certain range, thereby mechanically excavating the ground in front of the cutting edge member 12. be able to. As this excavation progresses, the tube 14 is propelled, but even if this propulsion causes the tube to rotate around its axis, that is, its central axis, and the beam tilts significantly from its horizontal position, as described above, , since the position of the pair of guide members supporting the beam can be adjusted in the circumferential direction with respect to the tube,
The beam can be returned to a horizontal position. Therefore, the beam can be held in a horizontal position, and the beam does not become an obstacle when shear is transferred from the excavation bucket to the conveyor device 88, thereby enabling efficient excavation work.

Further, when the beam 20 is moved in the axial direction of the pipe to move the excavation bucket forward or backward for excavation work, the conveyor device that receives the shear discharged from the excavation bucket moves integrally with the beam. The shear in the excavation bucket can be discharged onto the conveyor device near the excavation position of the excavation bucket. Therefore, it is not necessary to reciprocate the beam in order to return the excavation bucket to the discharge position to the conveyor device every time the excavation bucket is used for excavation, thereby making it possible to carry out more efficient excavation work.

Although a bolt-and-nut assembly consisting of a bolt 120 and a nut 122 is shown as the pushing device 116, other suitable pushing devices can be used, such as a hydraulic jack. The conveyor device 88 can also be fixedly supported by the beam.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an excavator according to the invention, and FIG. 2 is a cross-sectional view taken along the line - in FIG. 12...Blade mouth member, 14...Pipe, 18...Guide member, 20...Beam, 46...Boom, 54...
... Support part, 64 ... Excavation bucket, 88 ... Conveyor device, 90 ... Fixed arm, 92 ... Swing arm, 100 ... Actuation device, 112 ... Positioning means, 114 ... Show member, 116 ... Pressing device.

Claims (1)

[Scope of Claims] 1. A beam arranged in the radial direction of the pipe to be propelled, a boom pivotally connected to the beam, an excavation bucket pivotally connected to the boom, and a beam arranged in the axial direction of the pipe. A pipe-propelling excavator comprising: a pair of guide members extending in the axial direction of the pipe; and means for positioning the guide members on the pipe so as to be adjustable in the circumferential direction of the pipe. 2. The positioning means includes a pair of show members arranged at intervals in the radial direction within the pipe, the pair of guide members being fixed to one of the show members; a device disposed between the show members to releasably press both show members in a direction away from each other;
A pipe propulsion excavator according to claim 1. 3. The pair of shoe members are a pair of arcuate members disposed along the inner circumferential surface of the tube, and the pressing device is a bolt provided between mutually opposing ends of the pair of arcuate members. - The pipe propulsion excavator according to claim 2, which is a nut assembly. 4. A beam arranged in the radial direction of the tube to be propelled, a boom pivotally connected to the beam, an excavation bucket pivotally connected to the boom, and supporting the beam so as to be able to guide it in the axial direction of the tube. a pair of guide members extending in the axial direction of the tube; means for positioning the guide members in the tube so as to be adjustable in the circumferential direction of the tube; and a conveyor device that receives shear from the excavation bucket and transfers it rearward. 5. The boom according to claim 4, wherein the boom includes a support portion extending rearward from both end portions of the boom, and the conveyor device is tiltably supported via the support portion. Excavator for shield. 6. The conveyor device is suspended on the support portion via a pair of fixed arms and a pair of swing arms provided on the support portion so as to receive the conveyor device, and swings the swing arms. A pipe propulsion excavator according to claim 5, which is tilted by actuation of an actuating device.