JP2528995Y2 - Pipe renewal shield machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavating machine for renewing a pipe in which an existing pipe is excavated and crushed and a new pipe is buried at the same time without circulating water in the existing pipe.

[0002]

2. Description of the Related Art Conventionally, an excavating apparatus for renewing a pipe is disclosed, for example, in Japanese Patent Application Laid-Open No. 63-189593. This means that a plurality of arms with cutter bits are rotatably supported at the front of the first main body, and a first space having a conical shape is formed at the rear of the arms. The muddy water supply pipe and the muddy water discharge pipe were connected to the second space which was communicated with the pipe.

[0003]

[Problem to be Solved by the Invention] However, since the above-mentioned excavator employs a closed type of pressurized muddy water that discharges excavated earth and sand together with muddy water, it is suitable for sandy ground and gravel ground with a small gravel ratio. The structure is not suitable for the viscous soil that easily adheres to the first and second spaces, and the small first and second spaces make it difficult to control the earth pressure and easily impair the stability of the face. It has become.

[0004] The present invention solves the above-mentioned problems, and it is possible to hold earth pressure by muddy water and discharge excavated soil, as well as to hold earth pressure only by excavated soil and discharge excavated soil by a conveyor.
An object of the present invention is to provide a shield excavator for pipe renewal that is suitable for all types of soil, has excellent soil removal efficiency, and has excellent face stability.

[0005]

In order to solve the above-mentioned problems, the present invention is slidably inserted into an existing pipe at a distal end of a water pipe that projects forward and opens from an axis of a shield body. A seal member is provided, a cutter head is installed rotatably at the front of the shield body and crushes and excavates the existing pipe and surrounding ground, and is propelled through a new pipe by a jacking device for propulsion arranged at the starting shaft. In a shield excavating machine for pipe renewal, a water pipe is disposed at an axis in a shield main body, and a pressure chamber partition wall for forming a pressure chamber for retaining earth pressure at a rear portion of a cutter head is disposed in the shield main body. A cylindrical casing which is fitted to the pressure chamber partition wall at a constant interval around the water pipe and extends rearward; a helical screw rotatably disposed around the water pipe in the cylindrical casing; Hyde device provided with a rotary drive for rotating the provided is provided with a sediment carrying device to the rear end portion of the tubular casing.

[0006]

According to the above construction, the existing pipe is crushed by the cutter head and the surrounding ground is excavated while flowing water in the existing pipe backward through the water pipe. Then, the crushed pieces and excavated earth and sand are taken into the pressure chamber and conveyed rearward along the casing by the screw of the earth removal device,
It is carried out to the rear of the shield body by the earth and sand transport device. At this time, by adjusting the earth removal amount of the earth removal device, the earth pressure in the pressure chamber can be maintained at a predetermined level to prevent collapse of the face, and the pressure chamber can cope with the fluctuation of the earth pressure to stabilize the face. Can be held. In addition, even with viscous soil that easily adheres to the excavated member, it can be effectively discharged by the screw,
The earth pressure can be maintained only by the excavated soil and the excavated earth and sand can be discharged by the conveyor.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. This pipe renewal shield excavator is provided on a shield body 1 composed of a front body 2 and a rear body 3 that are tiltably connected to each other, and projects forward from the axial center of the front body 2 and the rear body 3 and is provided at an end thereof. A water pipe 5 having a seal body 4 slidably inserted into a pipe (aging pipe) A, and a cutter head 6 rotatably supported around the water pipe 5 at the front of the front body 2.
A rotating partition (an example of a pressure chamber partition) 8 which is arranged with a predetermined space behind the cutter head 6 to form a pressure chamber 7 for holding earth pressure, and a cylindrical casing 9 extending rearward from the rotating partition 8 Device 1 having a helical ribbon screw 10 rotatably disposed around a water pipe 5 therein
1 and an earth and sand transport device 12 for discharging the excavated earth and sand backward from the earth discharging device 11.

[0008] This pipe renewal shield machine is an existing pipe A
For example, it is for replacing a reinforced concrete sewer pipe with a new pipe having a large diameter. Although not shown, a shaft for starting is excavated at a position where the existing pipe A is buried. Then, the existing pipe A is removed in the starting shaft, the excavator is started from the shaft and propelled along the existing pipe A, and the existing pipe A and the surrounding ground are excavated and crushed and removed. After that, a new pipe will be installed. A jack device (not shown) for propelling the excavator is disposed in the starting shaft, and the excavator is first advanced, and thereafter, the excavator is advanced via a new pipe. In this pipe renewal work by the shield excavator, the flowing water (sewage) flowing through the existing pipe A in the existing pipe A is not particularly formed in the shield excavator and the new pipe, without making a detour path to the ground side. And a water flow hose (not shown).

The details of the pipe excavating shield excavator will be described below. The front trunk 2 and the rear trunk 3 are connected to each other by a plurality of direction correcting jacks 13 arranged at predetermined intervals in the circumferential direction so as to be tiltable with respect to each other. The front end of the rear body 3 is slidably fitted to the rear end of the rear body 2 via a sealing material. The water pipe 5 is for passing water flowing through the existing pipe A, for example, sewage without forming a detour path. The tip of the water pipe 5 that is tiltably connected via the flexible joint 14 has the existing pipe A. Is provided. The seal body 4 includes a packer 15a fixed to the water pipe 5, and a ring seal 15b that slides on the inner peripheral surface of the existing pipe A at the front and rear positions of the packer 15a. The water pipe 5 is opened at the front of the packer 15a.

As shown in FIG. 3, the cutter head 6 has an opening 1 for taking in excavated earth and sand and crushed pieces of the existing pipe A.
A plurality of roller bits 18 are attached to the rotating body 17 on which the
The water pipe 5 is supported at the center of the rotating body 17 via a bearing 19. The rotating body 17 is fixed to a front end of an annular support body 22 rotatably supported on a support member 20 of the front body 2 via a swivel bearing 21, and a funnel-shaped rotating partition 8 is mounted inside the rotating body 17 to have a predetermined capacity. Pressure chamber 7 is formed. A cutter turning gear 23 is mounted on the outer peripheral surface of the rear end small diameter portion of the annular support 22, and a cutter turning pinion 25 fixed to an output shaft of a cutter driving motor 24 is meshed with the cutter turning gear 23.

Accordingly, by driving the cutter driving motor 24, the annular support 22 is rotated via the cutter turning pinion 25 and the cutter turning gear 23, and the cutter head 6 is turned to drive the roller bit 18
Crushes the existing pipe A and excavates the surrounding ground. The excavated earth and sand and crushed pieces are taken into the pressure chamber 7 and discharged by the discharging device 11.

The casing 9 of the earth discharging device 11 has a front end rotatably fitted inside the rear end of the rotary partition 8 and is fixed to the same mounting member 26 as the cutter drive motor 24. The body 3 is closed by a discharge gate 27 capable of adjusting the discharge amount. This discharging gate 27
The sliding lid 28 is slid by an opening / closing cylinder 29 to adjust the degree of opening, whereby the amount of earth removed is adjusted, the pressure in the pressure chamber 7 is controlled, and the earth pressure can be appropriately maintained. The water pipe 5 arranged at the axial center of the casing 9 is detoured upward near the discharge gate 27 and penetrates through the top wall of the casing 9 to be drawn out further rearward.

The ribbon screw 10 of the above-mentioned earth removal device 11
Is disposed from the vicinity of the rear part of the cutter head 6 to the vicinity of the bypass part of the water pipe 5, and the screw driving device 30 of the ribbon screw 10 is provided at the rear part of the casing 9. That is, the screw driving device 30 has a rear end portion of the ribbon screw 10 fixed to a rotating cylinder 31 rotatably disposed in a cutout portion of the casing 9, and a screw rotating gear 32 fixed to an outer peripheral surface of the rotating cylinder 31. . A screw rotation pinion 34 is attached to an output shaft of a screw drive motor 33 provided in the casing 9, and the screw rotation pinion 34 is configured to mesh with the screw rotation gear 32 to rotate the ribbon screw 10. I have.

The earth and sand transporting device 12 is provided with, for example, a belt conveyor device 35, and discharges the earth and sand discharged from the discharging gate 27 to a shaft, and discharges it to the ground by other discharging means. As shown in FIG. 4, instead of the mechanical discharge of the discharge gate 27 of the discharge device 11 and the belt conveyor device 35, as shown in FIG. You may.

In the above configuration, when performing pipe renewal work, the running water (sewage, etc.) of the existing pipe A is passed through the water pipe 5 to the rear side of the new pipe, and the cutter turning motor 24 is driven to drive the cutter. While the head 6 is driven to rotate, the propulsion jack device in the starting shaft is advanced to advance the shield body 1 through the new pipe. As a result, the existing pipe A is crushed by the cutter head 6 and the ground around the existing pipe A is excavated, and the crushed pieces and earth and sand are taken into the pressure chamber 7. The crushed fragments and earth and sand in the pressure chamber 7 are efficiently taken into the casing 9 by the ribbon screw 10 rotated and driven by the screw driving device 30, conveyed inside the casing 10 backward, and fed from the discharge gate 27 to the belt conveyor device. Discharge to 35. At this time, the discharge gate 27
The earth pressure in the pressure chamber 7 is detected by a pressure sensor 36 disposed between the casing 9 and the rotary partition 8, and the opening degree of the slide lid 28 is adjusted based on the detection value of the pressure sensor 36, The earth removal amount is controlled, the earth pressure in the pressure chamber 7 is properly maintained, and the collapse of the face is prevented. Further, the inside of the casing 9 is discharged by the discharge screw 27 by the ribbon screw 10.
When transported to the side, there is a non-rotating water pipe 5 at the center of rotation of the ribbon screw 10, so that it is possible to prevent a decrease in transport efficiency caused by earth and sand rotating together with the ribbon screw 10. It is effective for excavation.

[0016]

As described above, according to the present invention, a soil removal device having a helical screw rotatable around a water pipe in a casing extending rearward from a pressure chamber partition forming a pressure chamber is provided. By providing the earth removal amount of the earth removal device, the earth pressure in the pressure chamber can be maintained at a predetermined level and the collapse of the face can be reliably prevented, and the fluctuation of the earth pressure can be dealt with by the pressure chamber. Can be held stably. In addition, it is possible to effectively discharge even the viscous soil which easily adheres to the excavated member. Not only the excavated soil can be discharged by the conveyor and the excavated earth and sand can be discharged by the excavated soil alone, but also by the muddy water. The excavated soil can be discharged by muddy water, it can be applied to cohesive soil as well as gravel ground, and it can be applied to a wide variety of ground. Furthermore, since the screw is provided around the water pipe, it is possible to prevent co-rotation of the discharged earth and sand and realize efficient transport.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a pipe excavating shield machine according to the present invention.

FIG. 2 is an enlarged vertical sectional view of the shield machine.

FIG. 3 is a front view of the shield machine.

FIG. 4 is a longitudinal sectional view of a shield machine showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield main body 2 Front trunk 3 Rear trunk 4 Seal body 5 Water pipe 6 Cutter head 7 Pressure chamber 8 Rotating bulkhead 9 Casing 10 Ribbon screw 11 Earth removal device 12 Earth and sand transporting device 24 Cutter turning motor 30 Cacre driving device 35 Belt conveyor device 40 Sediment transport device 41 Mud pipe 42 Drain pipe A Existing pipe

Claims (1)

(57) [Scope of request for utility model registration] 1. A seal member which is slidably inserted into an existing pipe is provided at a distal end of a water pipe which protrudes and opens forward from an axis of a shield body, and is rotatably disposed at a front part of the shield body. Provided with a cutter head for crushing and excavating the existing pipe and surrounding ground, and a pipe renewal shield excavator that is propelled through a new pipe by a propulsion jack device arranged in the starting shaft, The pressure chamber partition which forms the pressure chamber for holding the earth pressure at the rear of the cutter head is disposed on the shield body, and the pressure chamber partition is fitted around the water pipe at regular intervals. A rearwardly extending cylindrical casing, a helical screw rotatably disposed around the water pipe in the cylindrical casing, and a soil discharging device provided with a rotation driving device for rotating the screw are provided. A shield excavating machine for pipe renewal, wherein a soil transport device is provided at a rear end of the cylindrical casing.