JPH1181866A - Guide pipe for small bore pusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a buried pipe without deteriorating construction efficiency even with a conglomerate bed or soil quality of a high N-value by pushing it while boring a roughly similar diameter to an outer diameter of the buried pipe, and return a guide pipe to a start vertical shaft to eliminate need of an arrival vertical shaft. SOLUTION: A disc cutter 2a disposed on the outermost circumferential part of a cutter head 3 is supported on a tip of a support member 6 having a roughly L-shaped cross sectional surface to get along an inner surface of the cutter head 3, and it is oscillated by a hydraulic cylinder 12 between a position where the outermost bored diameter becomes roughly similar to an outer diameter of a buried pipe, and a position where it becomes smaller than an inner diameter of the buried pipe. A bulk head 4 is provided with a stopper 10 to hold the support member 6 at a position where the outermost bore diameter of the disc cutter 2a is roughly similar to the outer diameter of the buried pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leading pipe of a small-diameter thruster for laying a buried pipe underground.

[0002]

2. Description of the Related Art Conventionally, as a tunnel machine for laying pipes such as sewer pipes, electric wires or communication lines underground,
Mainly small caliber thrusters are used. When laying the pipeline using a small-diameter thruster of this type, first, a start shaft and an arrival shaft are constructed on a predetermined line to be laid for the pipeline, and a small-diameter thruster is mounted on the start shaft. A main pushing device is installed, and the leading tube is advanced by rotating the cutter head provided at the tip of the leading tube by the pushing device.After that, a pipe to be embedded is fixed to a rear end of the leading conduit. By pressing the rear end face of the pipe with the main pressing device, the pipe following the leading pipe penetrates the ground. In this way, by sequentially connecting and propelling the pipes to the front pipe until the front pipe reaches the arrival shaft pre-constructed on the planned laying line, a pipeline between the start shaft and the arrival shaft is provided. Can be laid. When the direction of the leading pipe deviates from the planned laying line during propulsion, it is general to correct the direction by swinging the leading pipe. After the propulsion, the leading conduit is collected from the arrival shaft.

[0003] The leading conduit is constituted by a device such as a rotary drive unit of a cutter head, a direction correcting device for controlling the direction, an earth discharging device and a position measuring device. Further, the pipe to be buried is fixed directly or indirectly to the rear end of the front pipe, and by pushing the main pushing device against the buried pipe and propelling it, the front pipe is connected through the continuous buried pipe. It is configured to transmit thrust to the vehicle.

However, in such a small-diameter thruster, the leading pipe cannot be collected until it reaches the reaching shaft, so that the reaching shaft is indispensable. Therefore, there is a problem that burial pipes cannot be laid when a reaching shaft cannot be constructed.

As a method for solving such a problem,
In Japanese Utility Model Laid-Open Publication No. 4-108682 and Japanese Utility Model Laid-Open Publication No. 4-108689 proposed by the present applicant, the outer diameter of the leading pipe is made smaller than the inner diameter of the buried pipe, and the leading pipe is collected in the starting shaft through the buried pipe. A small-diameter thruster configured to perform this operation is disclosed.

However, these Japanese Utility Model Laid-Open Publication Nos.
No. 82 and Japanese Utility Model Laid-Open No. 4-108689, the outer diameter of the leading pipe is smaller than the inner diameter of the buried pipe, so that the portion outside the inner diameter of the buried pipe is excavated. Instead, the buried pipe will be propelled, and the ground outside the inner diameter of the buried pipe will be compacted, which will increase the propulsion resistance and reduce the construction efficiency.

As a solution to such a problem,
Japanese Unexamined Patent Publication No. Hei 9-144485 discloses an excavator which is constituted by a plurality of refractible spokes arranged in a radial direction of a cutter head, and an outer peripheral bit is attached to a tip of the spoke. The length of the spoke is set so that the locus of the outer peripheral bit when the cutter head is rotated is substantially equal to or larger than the outer diameter of the outer cylinder. This excavator is configured to bend the spokes after excavation to avoid interference with the pipe, and to return to the starting shaft through the inside of the pipe.

In Japanese Utility Model Laid-Open Publication No. 63-86198, as shown in FIG. 3, the position of the cutting edge of the disk cutter 101 outside the outer surface of the propulsion tube 102 and the position inside the inner surface of the propulsion tube 102 are determined. An excavator in which the cutting edge of the disk cutter 101 is swingably attached to the tip of an inner tube via a pin 103 so as to be able to move between them is disclosed. In this excavator, the disk cutter 1
A stopper 104 for fixing the disk cutter 101 is provided on a side of the disk cutter 101 so that the blade of No. 01 is fixed at a position outside the outer surface of the propulsion tube 102. Also in this excavator, by moving the disk cutter 101 inward, the excavator can be pulled back to the starting shaft through the inside of the pipe.

[0009]

However, in the excavator disclosed in Japanese Patent Application Laid-Open No. Hei 9-144485,
The cutter head is made up of spokes that can be bent,
Since it is a type in which earth and sand are excavated by the cutter bit provided in the spoke, it is not suitable for excavation of the reticulated layer, and the structure of the cutter head is very complicated. There is also a problem that the direction is difficult to correct because the spokes are refracted when the direction is corrected.

In the excavator disclosed in Japanese Utility Model Laid-Open Publication No. 63-86198, the disc cutter 10
Although a part of the load applied to 1 can be received by the stopper 104 on the side of the disk cutter 101, most of the load is received by the pins 103 supporting the disk cutter 101. In this structure, when a high pressing force needs to be applied to the disk cutter, such as when excavating hard rock soil, the pins and the mounting portions of the pins must necessarily be enlarged. When this structure is applied to an excavator that excavates while excavating the face by preventing the excavated earth and sand accumulated in the chamber from collapsing with the earth pressure in front, the size of the pin and the pin mounting member are increased. The flow of sediment into the inside and the flow of sediment in the chamber are deteriorated, so that the excavation efficiency is greatly reduced and the sediment in the chamber is blocked.

The present invention has been made in order to solve such a problem, and the present invention is directed to excavating a pipe having a diameter substantially equal to the outer diameter of a buried pipe so as to excavate the pipe even if it is a reticulated layer. It is an object of the present invention to provide a small-diameter thruster capable of reliably laying a buried pipe without lowering a pipe, pulling a leading pipe back to a starting shaft, and making an reaching shaft unnecessary. Things.

[0012]

In order to achieve the above-mentioned object, a leading pipe of a small-diameter thruster according to the first invention of the present application has a chamber for storing excavated earth and sand, and a disk in a front part thereof. In a leading pipe of a small-diameter propulsion machine that excavates underground by rotating a cutter head having a cutter, (a) a disk cutter disposed at an outermost peripheral portion of the cutter head is swingable with respect to the cutter head. And (b) the support so that the disc cutter moves between a position where the outer diameter of the disc cutter is substantially the same as the outer diameter of the buried pipe and a position where the outer diameter of the disc cutter is smaller than the inner diameter of the buried pipe. (C) a stopper provided on a plane perpendicular to the propulsion direction and supporting the support member at the excavation position of the disk cutter. The one in which the features.

In the first invention, the disk cutter disposed at the outermost periphery of the cutter head is rocked by the rocking means until the outer diameter of the digging is substantially the same as the outer diameter of the buried pipe. The supporting member to be supported is held in contact with a stopper provided on a surface perpendicular to the propulsion direction. Next, while rotating the cutter head while holding the disk cutter at the position, the leading pipe is advanced from a starting shaft previously constructed on the planned laying line of the buried pipe, and the buried pipe is placed at the rear end of the leading pipe. Stick. In this way, the buried pipe is successively added to the rear end face of the buried pipe, and the leading pipe is propelled until the buried pipe reaches a laying length.

Next, when the buried pipe is laid to the predetermined length and the propulsion is completed, the disc cutter is rocked by the rocking means to a position where the outer diameter of the excavation is smaller than the inner diameter of the buried pipe. In this way, the leading conduit becomes smaller than the inner diameter of the buried pipe, and is pulled back to the starting shaft, so that it is collected into the starting shaft via the buried pipe.

In the first invention, the disk cutter excavates a diameter substantially equal to the outer diameter of the buried pipe, so that the ground outside the buried pipe is not compacted and the propulsion resistance of the buried pipe is reduced. It is possible to excavate a gravel layer without fail.

Most of the load (propulsion reaction force) applied to the disk cutter during propulsion is received by a stopper provided on a surface perpendicular to the propulsion direction, and almost all loads are applied to the rocking means and the pins of the disk cutter. Since it is not applied, the area around the pin can be made compact. Thus, the obstruction or the like can be prevented without obstructing the flow of the earth and sand into the chamber and the flow of the earth and sand within the chamber. Further, in the first invention, after the propulsion is completed, the disk cutter is swung to make the entire diameter smaller than the inner diameter of the buried pipe, and is recovered through the buried pipe into the starting shaft, so that the reaching shaft is unnecessary. This has the effect.

The leading pipe of the small-diameter thruster according to the second invention of the present application has a chamber for storing excavated earth and sand,
In a leading pipe of a small-diameter propulsion machine that excavates underground by rotating a cutter head having a disk cutter at a front part, and (a) a disk cutter disposed at an outermost peripheral part of the cutter head is attached to the cutter head. And (b) the disk cutter is disposed between a position where the outer diameter of the disc cutter is substantially the same as the outer diameter of the buried pipe and a position where the outer diameter of the disc cutter is smaller than the inner diameter of the buried pipe. Rocking means for rocking the support member so as to move;
(C) earth removal means driven by a drive source different from the cutter head; (d) the swing means built in the cutter head and rotating with the cutter head; And a swivel joint for connecting a hydraulic pipe for supplying and discharging oil.

In the second invention, as in the first invention, the disk cutter disposed at the outermost peripheral portion of the cutter head is rocked by the rocking means until the outer diameter of the disk cutter becomes substantially the same as the outer diameter of the buried pipe. In this state, the cutter head is rotated so that the buried pipe is propelled so that the buried pipe is sequentially added to the rear end from the starting shaft previously constructed on the planned laying line of the buried pipe. After the buried pipe is laid to the predetermined length and the propulsion is completed, the leading pipe is moved in a state where the disc cutter is rocked by the rocking means to a position where the excavation outer diameter is smaller than the buried pipe inner diameter. It is pulled back to the starting shaft and is collected into the starting shaft via the buried pipe.

In the second invention, the cutter head is adapted to be rotated by a drive source different from a screw shaft of an earth discharging device, and is provided in the cutter head to a swinging means of a disk cutter provided in the cutter head. Pressure oil is supplied and discharged from the rear fixed part via the swivel joint.

According to the second aspect of the present invention, in the independently driven front pipe in which the cutter head and the screw shaft are independently rotated, the front pipe can be recovered to the starting shaft in the same manner as in the first invention. Also, by providing a swivel joint in the cutter head for supplying and discharging pressure oil to and from the oscillating means that rotates together with the cutter head, the piping to the oscillating means can be made compact and the piping can be easily handled. This has the effect.

In the first invention and the second invention, it is preferable that the support member is arranged along the inner wall of the chamber of the cutter head. By arranging the support members in this manner, the protrusion of the cutter head in the chamber can be reduced, and the flow of the earth and sand can be improved, and the blockage can be prevented.

Further, in the first invention and the second invention, it is preferable that the swing means is arranged in a spoke of the cutter head. By doing so, the protrusion of the cutter head in the chamber can be reduced in the same manner as described above, and the flow of the earth and sand can be improved and the blockage can be prevented.

Further, in the first invention and the second invention, it is preferable that a pipe to the swing means is disposed inside the screw shaft. By doing so, the pipes to the rocking means can be stored neatly, and there is an effect that the flow of earth and sand is not hindered.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a leading pipe of a small-diameter thruster according to the present invention will be described with reference to the drawings.

FIG. 1 is a partial longitudinal sectional view of a leading pipe of a small-diameter thruster according to an embodiment of the present invention, and FIG. 2 is a front view of FIG.

In the leading pipe 1 of the small-diameter thruster of this embodiment, the outer diameter of the trunk is smaller than the inner diameter of a buried pipe (not shown) buried in the ground, and a plurality of discs are provided on the front surface. A cutter head 3 having a cutter 2 is provided, and a chamber 3a is formed between the cutter head 3 and a bulk head 4 at the rear. In addition, on the central axis of the front conduit 1, there is provided an earth discharging device 5 having a screw shaft 5b for discharging earth and sand taken into the chamber 3a and a screw 5a protruding from the outer peripheral surface of the screw shaft 5b. It is provided rotatably around the axis. Buried pipes are sequentially connected to the rear end of the front pipe 1, and a main pushing device (not shown) is arranged in the starting shaft in order to press the rear end surfaces of these buried pipes. The trunk of the front conduit 1 is divided into a front trunk 1a and a rear trunk 1b, and the front trunk 1a and the rear trunk 1b can be bent by a swinging jack (not shown) so that the direction can be corrected. I have. Also,
The cutter head 3 is driven by a drive source different from the screw shaft 5b.

A disk cutter 2a arranged at the outermost periphery of the cutter head 3 among the plurality of disk cutters 2
Is supported by the tip of a support member 6 having a substantially L-shaped cross section along the inner wall of the cutter head 3. A plurality (two in this embodiment) of brackets 9 project forward from a bulkhead 4 provided at a rear portion of the cutter head 3, and the bracket 9 has a base end of the support member 6. The portion is pivotally supported via a pin 7.

The disk cutter 2 is provided on the cutter head 3. The spoke 11 of the cutter head 3 has a disk cutter 2 a supported by the support member 6. A hydraulic cylinder (swinging means) 12 that swings between a position having substantially the same size and a position smaller than the inner diameter of the buried pipe is provided. The bulkhead 4 has the disk cutter 2a.
A stopper 10 for holding the position of the support member 6 by contacting the back surface of the support member 6 when the outermost excavation diameter is swung to a position where the outermost excavation diameter is substantially the same as the outer diameter of the buried pipe. I have.

A swivel joint (not shown) is built in the central portion of the cutter head 3 indicated by reference numeral 15, and a hydraulic pipe arranged at the base end of the hydraulic cylinder 12 and a discharge pipe are connected through the swivel joint. Hydraulic piping 14 arranged in the screw shaft 5b of the earth device 5 is connected to the hydraulic cylinder 12 rotating together with the cutter head 3 so that pressure oil is supplied and discharged from the rear of the leading pipe 1 to the hydraulic cylinder 12. It has become.

In the leading pipe 1 of the small-diameter thruster constructed as described above, the hydraulic cylinder 12 is extended,
The disk cutter 2a supported by the support member 6 is swung until the support member 6 comes into contact with the stopper 10. Next, while the cutter head 3 is rotated by a cutter head drive source 16 provided behind the front body 1a, the buried pipe is propelled by the main pushing device to thereby cause the leading pipe 1 to rotate.
To promote. Thus, the earth and sand taken into the chamber 3a by the disk cutter 2 is carried out to the starting shaft through the earth discharging device 5. In this way, the front pipe 1 is propelled, new buried pipes are successively added to the rear end of the buried pipe, and the propulsion operation is performed until the buried pipe reaches the planned laying length.

After the completion of the propulsion operation, the hydraulic cylinder 12 is contracted to move the disk cutter 2a supported by the support member 6 to a position where the outermost excavation diameter is smaller than the inner diameter of the buried pipe (2). (Dotted line position). By pulling out the outer diameter of the front pipe 1 so as to have a diameter smaller than the inner diameter of the buried pipe, the front pipe 1 passes through the buried pipe and is collected in the starting shaft.

In this embodiment, since the excavation work is performed with the outermost excavated diameter of the disk cutter 2 substantially equal to the outer diameter of the buried pipe, the propulsion resistance of the buried pipe can be reduced, and the sand and gravel can be reduced. There is an effect that it is possible to reliably excavate even a hard soil layer such as a layer. In addition, since the leading conduit 1 can be collected in the starting shaft after the propulsion operation is completed, there is an effect that the reaching shaft is not required.

Furthermore, in this embodiment, when the leading pipe 1 is dug, most of the propulsion reaction force applied to the disk cutter 2 a in the propulsion direction is received by the stopper 10 attached to the bulkhead 4. For this reason, a high load is not applied to the pin 7, and even the hard rock soil such as the gravel layer can be reliably excavated.

In this embodiment, the support member 6 has a substantially L-shaped cross section along the bulkhead 4 and the hydraulic cylinder 12 is disposed in the spoke 11. The protrusions in the chamber 3a can be minimized, and there is no device on the back of the disk cutter 2 to prevent the flow of earth and sand, and the earth and sand taken into the chamber 3a is smoothly supplied to the earth discharging device 5. In addition to this, it is possible to prevent earth and sand from being clogged in the cutter head 3.

In this embodiment, since the swivel joint is arranged at the center of the front surface of the cutter head 3, the hydraulic piping 14 to the hydraulic jack 12 can be compactly stored, and the piping can be easily arranged. Further, since the pipe is not exposed to the outside, there is an effect that the flow of earth and sand is not hindered.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a leading pipe of a small-diameter thruster according to one embodiment of the present invention.

FIG. 2 is a front front view of the present embodiment.

FIG. 3 is a longitudinal sectional view illustrating a disk cutter swinging mechanism of a conventional propulsion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead pipe 2, 2a Disc cutter 3 Chamber 4 Bulkhead 5 Discharger 5a Screw 5b Screw shaft 6 Support member 7 Pin 9 Bracket 10 Stopper 11 Spoke 12 Hydraulic cylinder 14 Hydraulic piping 16 Cutter head drive source

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Taku Arakawa 3-1-1 Ueno, Hirakata-shi, Osaka Komatsu Ltd. Osaka Plant

Claims (5)

[Claims] 1. A forward conduit of a small-diameter propulsion machine having a chamber for storing excavated earth and sand and excavating underground by rotating a cutter head having a disk cutter at a front part thereof, wherein: (B) a position where the outer diameter of the disk cutter is substantially the same as the outer diameter of the buried pipe and the inner diameter of the buried pipe; Rocking means for rocking the support member so that the disk cutter moves between a smaller position,
And (c) a stopper provided on a plane perpendicular to the propulsion direction and supporting the support member at the excavation position of the disk cutter. 2. A front pipe of a small-diameter propulsion machine having a chamber for storing excavated earth and sand and excavating underground by rotating a cutter head having a disk cutter at a front part thereof, and (a) the cutter head. (B) a support member for swingably supporting a disk cutter disposed at the outermost periphery of the cutter head with respect to the cutter head; and (b) a position where the outer diameter of the disk cutter is substantially the same as the outer diameter of the buried pipe. Swinging means for swinging the support member so that the disk cutter moves to a position smaller than the inner diameter of the pipe; (c) earth discharging means driven by a drive source different from the cutter head; d) a swivel joint which is connected to the swinging means which is built in the cutter head and rotates together with the cutter head, and which connects a hydraulic pipe for supplying and discharging pressure oil to and from the swinging means. A small-diameter thruster having a point. 3. The small-diameter propulsion device according to claim 1, wherein the support member is arranged along an inner wall of the chamber of the cutter head. 4. The forward conduit of a small-diameter thruster according to claim 1, wherein the swinging means is disposed in a spoke of a cutter head. 5. The apparatus according to claim 1, wherein the earth removal device includes a screw shaft for discharging earth and sand taken into the chamber backward, and a pipe to the swinging means is disposed inside the screw shaft. 3. A conduit for a small-diameter thruster according to claim 1 or 2.