JPH03267497A - Excavation method of pipe line and excavating device - Google Patents

Abstract

PURPOSE:To reduce the cost by pushing forward a facility pipe to an arriving shaft from a starting shaft while excavating a pipe line, reducing the outer diameter of a cutter head less than the inner diameter of the facility pipe after the facility pipe is installed, and collecting it from the inside of the starting shaft. CONSTITUTION:A body section 1 of an excavating device K is fixed to the first facility pipe P, and a space between a housing 6 and the pipe P is covered with a seal 3. Then, after the device K is lowered to the inside of a staring shaft together with the pipe P, a driving motor 10 and an earth removing conveyer 12 are started, a driving jack is pushed forward, and the device K is pushed to an arriving shaft while excavating a pipe line by a cutter head. After that, a following pipe P is connected to the rear end of the first pipe P to successively excavated. After a specified number of pipes P are installed, an outside excavation section 7b is removed from the head 7 to reduce, and it is restored to the starting shaft side under the state to collect it on the ground. Accordingly, a cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an excavation method and an excavation device for excavating a pipe for a facility pipe such as a humid pipe buried underground.

[Conventional technology]

Conventionally, when burying a facility pipe, a cutter head C having approximately the same diameter as the outside diameter of the facility pipe f is used, for example, as shown in FIG.
An excavator k having a main body and a main body is installed at the tip of the facility pipe f, and the facility pipe f is pushed toward the destination shaft side using a pusher jack installed in the starting shaft, and the excavator k is reached by the rotary excavation operation of the cutter head C. After digging to the shaft, excavator k was pulled up from inside the reaching shaft.

[Problem to be solved by the invention]

In the above-mentioned excavation method, if the reaching shaft is a narrow shaft such as an existing manhole, it is not possible to pull up and recover the excavator k, so it was necessary to dismantle or cut the excavator k and remove it.

An object of the present invention is to solve the above-mentioned problems and provide a method and excavation device for conduit excavation that allows recovery of the excavation device even if the reaching shaft is narrow and enables excavation work by mechanical excavation. .

[Means to solve the problem]

In the present invention, when the main body of the excavation equipment is inserted into the first facility pipe and fixed to this facility pipe, a cutter head installed adjacent to the front of the main body is used to create a pipe that matches the outer diameter of the facility pipe. While excavating the pipeline, the facility pipe is pushed from the starting shaft to the destination shaft side, and then the cutter head excavates the pipeline and pushes the next facility pipe sequentially, which is repeated. After installing a predetermined number of facility pipes in the pipeline excavated across the reaching shaft, the main body is released from the fixed state and the outer diameter of the cutter head is reduced to below the inner diameter of the facility pipe. , a pipe excavation method in which the main body portion is passed retrogradely through each facility pipe and recovered from the starting shaft, and the main body has a housing formed to be insertable into the facility pipe and housing a cutter drive mechanism. a cutter head installed adjacent to the front part of the main body part in order to excavate a conduit that matches the outer diameter of the facility pipe at the front end of the first facility pipe, and sealing the gap between the housing and the facility pipe. a fixing mechanism attached to the nousing for releasably fixing the housing to the facility pipe; a correction mechanism for correcting the direction of propulsion of the leading facility pipe; The gist of the present invention is to provide a pipe excavation device equipped with cutter diameter converting means for reducing the outer diameter of the cutter head to less than the inner diameter of the facility pipe.

[For production]

A cutter head rotating at the end of the main body inserted into the leading facility pipe and fixed to this facility pipe excavates the pipe while pushing the facility pipe and excavation equipment to move a predetermined number of facility pipes from the starting shaft. The main body is buried across the reaching vertical shaft, and when a predetermined number of facility pipes have been buried, the cutter head is reduced to the inner diameter of the facility pipe or less to enable passage of the main body into each facility pipe, and the main body is It is removed into the starting shaft through the facility and collected at the starting shaft.

〔Effect of the invention〕

Since the present invention is constructed as described above, even if the reaching shaft is narrow, there is no need to cut or dismantle the main body of the excavation equipment after burying each facility pipe, and the main body can be moved to the facility. It can be easily removed from the pipe as it is and recovered from the starting shaft unharmed, allowing for safe and smooth installation of facility pipes regardless of the size of the arriving shaft.
It also has the effect of reducing the cost of burial work.

〔Example〕

Next, one embodiment of the present invention will be described with reference to the drawings.

First, the excavation device K used for excavating pipes for facility pipes will be explained.

The excavation equipment includes a main body part 1 which is charged with a gap in the leading facility pipe P of a predetermined number of facility pipes P-P buried in series underground from the departure shaft TI to the arrival shaft T2;
A cutter head 7 is disposed adjacent to the front of the main body part l and rotated at the front of the leading facility pipe P, and a housing is provided to seal the gap between the housing 6 of the main body part 1 and the facility pipe P. Seal mechanism 3 removably fitted onto 6
and an appropriate number of fixing mechanisms 4 attached to the housing 6 to releasably fix the housing 6 to the inner wall surface of the facility pipe P, and It is equipped with a facility pipe P and a correction mechanism 5 installed at the connection part with the facility pipe P that follows this facility pipe P, and the drilling equipment is equipped with a correction mechanism 5 installed in the leading facility pipe P in the starting shaft Tl. is charged into the

The housing 6 of the main body part l includes a cylindrical skin plate 6a having an outer diameter smaller than the inner diameter d of the facility pipe P and loosely inserted concentrically into the facility pipe P, and this skin plate 6.
A partition plate plate b is integrally constructed along the cross-sectional direction of the housing 6, and a cutter drive motor lO attached to the partition plate 6b is housed in the upper part of the housing 6 in a forward facing manner. Cutter drive motor 1
A pinion 11 is fitted to the output shaft of the motor.

At the lower part of the partition plate 6b of the housing 6, there is an earth discharge conveyor 12 for discharging earth and sand excavated by the cutter head 7 to the rear of the main body l.
This earth removal conveyor 12 is installed in a forward-inclined manner through
1 includes a cylindrical outer cylinder 12a, a screw 12b that is rotatably fitted into the outer cylinder 12a and whose tip protrudes toward the front of the partition repeller b, and an outer cylinder 12a for rotationally driving the screw 12b. The outer cylinder 12a is equipped with a motor 12c attached to the rear end, and a hydraulic cylinder 12d attached to the outer cylinder 12a to open and close the soil discharge port of the outer cylinder 12a. It is connected to the piston rod of the cylinder 13 and its tilting is controlled.

The cutter head 7 is attached to the tip of the rotating body 2 rotatably supported in the housing 6, and the cutter head 7 has an inner excavation part 7a formed so as to be inserted into the facility pipe P, and an inner excavation part 7a formed to be inserted into the facility pipe P. In order to reduce the effective outer diameter of the cutter head 7 to less than the inner diameter di of the facility pipe P when collecting the
An outer excavation part 7b is disposed around the inner excavation part 7a and is removably attached to the inner excavation part 7a by bolts 23 to 23. The inner excavation part 7a has an opening for passing the excavated soil, and has a main surface plate 14 having an outer diameter equal to or less than the inner diameter dl of the facility pipe P and approximately equal to the outer diameter of the housing 6.
and a large number of cutter bits 15 attached to the front side of the main face plate 14, and the outer excavation part 7b is fitted onto the main face plate 14 and has an inner diameter approximately equal to the outer diameter of the skin plate 6a. Moreover, it is formed by a ring-shaped sub-face plate 16 having an outer diameter approximately equal to the outer diameter d2 of the facility pipe P, and a large number of cutter bits 17 attached to the front side of this sub-face plate 16.

At the center of the main face plate 14 of the cutter head 7 is a shaft 18 which projects horizontally rearward, is thrust into the housing 6, and whose rear end is rotatably inserted into and supported by the center of the partition plate 9. A circumferential body portion 1 is integrally fixed, and protrudes rearward from the outer peripheral edge of the rear side of the main face plate 14, and is rotatably inserted into the skin plate 6a of the housing 6 in a tight fit.
9 is fixed at a constant value. A ring-shaped external gear 20 meshed with the pinion 11 of the cutter drive motor IO is attached to the rear end of the circumferential body 19, and the rotation of the drive motor IO is transmitted to the circumferential body 19 via the pinion 11 and the external gear 20. As a result, the cutter head 7 is rotationally driven.

The sealing mechanism 3 is removably attached to the housing 6 by being fitted into a cylindrical front auxiliary plate 21 that is externally fitted onto the tip of the leading facility pipe P and whose tip portion protrudes toward the front of the facility pipe P. ing. The sealing mechanism 3 includes a metal holder 3a that is fitted onto the skin plate 6a of the housing 6 and abuts the front end surface of the leading facility pipe P, and a front auxiliary plate 21 that is fitted into the front groove of the holder 3a. A front seal ring 3b made of an elastic material is closely inscribed in the holder 3a, and a rear seal ring 3C made of an elastic material is fitted into the rear groove of the holder 3a and tightly circumscribed in the skin plate 6a. .

On the outer circumferential surface of the skin plate 6a of the housing 6, an appropriate number of rollers 9 that roll in sliding contact with the inner wall surface of the facility pipe P are installed on the skin plate 6a so that the main body 1 slides within the facility pipe P during collection. It is attached via a roller holder 9a attached to the outer peripheral surface.

Each fixing mechanism 4 includes a pressing bolt 4a screwed through the skin plate 6a of the housing 6, and this pressing bolt 4.
The main body part 1 is centered by each fixing mechanism 4, and includes a restraining plate 4b attached to the tip of the pipe a and pressed against the inner wall surface of the facility pipe P, and a lock nut 4c screwed into the pressing bolt 4a. It is fixed to the facility pipe P in this state.

The correction mechanism 5 is fitted in a cylindrical rear auxiliary plate 22 that is fitted onto both facility pipes P over the rear end of the leading facility pipe P and the tip of the facility pipe P that follows this facility pipe P. , this correction mechanism 5 includes an external splint plate 5a that is in contact with the rear end surface of the leading facility pipe P, an internal splint plate 5b that is in contact with the distal end surface of the next facility pipe P, both splint plates 5a, and a correction jack 5c removably sandwiched in a tensioned state between 5b,
The direction of propulsion of the leading facility pipe P can be adjusted by expanding and contracting the correction jack 5c to make the axial center of the leading facility pipe P obliquely intersect with the axial center of the succeeding facility pipe P.

Next, a predetermined number of facility pipes are excavated from the starting shaft TI to the reaching shaft T2 while excavating the pipeline R using the above-mentioned excavation device K.
This section explains the excavation method for burying the ground underground.

First, the main body part 1 of the excavation equipment is inserted into the leading facility pipe P and fixed to the leading facility pipe P by each fixing mechanism 4, and the gap between the housing 6 and the facility pipe P is sealed by the sealing mechanism 3. After sealing, the correction mechanism 5 is attached to the rear end of the leading facility pipe P, and the excavating device K is set on the leading facility pipe P on the ground.

In this state, the excavation rig K is lowered to the bottom of the starting shaft TI along with the leading facility pipe P, and then the cutter drive motor 10 and the earth removal conveyor 12 are started, and the propulsion jack 26 installed in the starting shaft TI is started. The pressing rod 26a is moved forward, and the facility pipe P is pushed while excavating the pipe line R by the cutter head 7, and the facility pipe P and the excavation equipment K are pushed toward the reaching shaft T2 side.

Subsequently, when the leading facility pipe P leaves the starting shaft TI in the forward direction, the push rod 26a of the propulsion jack 26 is retreated, and the next facility pipe P is lowered to the bottom of the starting shaft TI. and connect it to the rear end of the leading facility pipe P in a butt-like manner, and in this state, cutter head 7 connects the pipe R to the rear end of the leading facility pipe P.
26 while excavating the next facility pipe P.
to push both facility pipes P and drilling equipment K toward the reaching shaft T2 side. Similarly, while excavating the pipeline R using the cutter head 7, the following facility pipes P are sequentially pushed toward the reaching shaft T2 side, and if an error occurs in the direction of propulsion of the facility pipe P, the correction mechanism 5 is used to move the facility pipes P to the leading facility The propulsion direction of the pipes P is corrected, and a predetermined number of facility pipes P are installed in the pipe line P excavated from the starting shaft TI to the arrival shaft T2.

Then, with the cutter head 7 entering the reaching shaft T2, the cutter drive motor lO and the earth removal conveyor 12 are stopped, the outer excavation part 7b is removed from the cutter head 7, and the outer diameter of the cutter head 7 is adjusted to the facility pipe P. While reducing the inner diameter to below d1, the seal mechanism 3 is removed from the housing 6,
Further, the pressing bolts 4a of each fixing mechanism 4 are screwed back to release the fixed state of the main body l, and the correction jack 5c of the correction mechanism 5 is removed. In this state, the main body l is towed toward the starting shaft TI side by the drag means, and the main body l is moved backwards inside each facility pipe P along with the inner excavation part 7a of the cutter head 7, the correction jack 5c, piping, wiring, etc. Pass through and start shaft T
1, and then pulled up from the starting shaft Tl to the ground and recovered.

On the other hand, the removed outer excavation part 7b and the seal mechanism 3 are pulled up from the reaching shaft T2 to the ground and recovered.

Next, the operation and effects of the embodiment having the above configuration will be explained.

In this example, the main body part l has a housing 6 that is formed to be insertable into the facility pipe P and houses a cutter drive mechanism, and a pipe that fits the outer diameter d2 of the facility pipe P at the end of the leading facility pipe P. A cutter head 7 installed adjacent to the front of the main body part l for excavating a road, a sealing mechanism 3 for sealing the gap between the housing 6 and the facility pipe P, and a mechanism that allows the housing 6 to be released into the facility pipe P. A fixing mechanism 4 attached to the housing 6 for fixing, a correction mechanism 5 for correcting the direction of propulsion of the leading facility pipe P, and reducing the outer diameter of the cutter head 7 to below the inner diameter di of the facility pipe P. When excavating the pipeline R using the excavation device K equipped with a cutter diameter conversion means, the main body 1 is inserted into the leading facility pipe P,
While excavating a pipe R that matches the outside diameter d2 of the facility pipe P using the cutter head 7, the facility pipe P is pushed from the starting shaft TI to the arrival shaft T2 side, and then the cutter head By repeating the operation of sequentially pushing the following facility pipes P without excavating the pipe R in step 7, a predetermined number of facility pipes P are installed in the pipe P excavated from the starting shaft TI to the arrival shaft T2. After that, the main body l is released from the fixed state and the outer diameter of the cutter head 7 is reduced to less than the inner diameter di of the facility pipe P, and the main body l is passed through each facility pipe P in a retrograde direction. and collect it from the starting shaft Tl.

Therefore, when excavating the pipe line R of the facility pipe P using the excavation rig K, even if the reaching shaft T2 is narrow, the main body l should be cut off to the excavation rig after the completion of burying each facility pipe P. This eliminates the need for construction and disassembly, and the main body part l can be easily removed from the facility pipe P in its original condition and recovered from the starting shaft T1 undamaged, regardless of the size of the arrival shaft T2. P burial work is carried out safely and smoothly, and as a stage, the outer circumferential part of the cutter head is divided in the circumferential direction to form a plurality of outer excavated parts, and each divided outer excavated part is made into an inner excavated part. It may be connected to a piston rod of an attached hydraulic cylinder, and the outer excavation portion may be advanced and retracted in the radial direction of the cutter head by the forward and backward movement of this piston rod.

Alternatively, the entire cutter head may be removed.

[Brief explanation of drawings]

Figures 1 to 3 show one embodiment of the present invention.
The figure is a vertical cross-sectional view of the drilling rig, the second figure is a front view, and the third figure is a front view.
The figure is a vertical cross-sectional view for explaining the excavation method, and FIG. 4 is a vertical cross-sectional view of a conventional excavation device. 1--Main body part 3--Seal mechanism 4--Fixing mechanism 5--Correction mechanism 6--Housing 7-Cutter head P-Facility pipe R-1 Pipe line

Claims (2)

[Claims] (1) With the main body of the excavation equipment inserted into the first facility pipe and fixed to this facility pipe, a cutter head installed adjacent to the front of the main body allows the pipe to be adapted to the outside diameter of the facility pipe. While excavating the pipeline, the facility pipe is pushed from the starting shaft to the destination shaft side, and then the cutter head excavates the pipeline and pushes the next facility pipe sequentially, which is repeated. After installing a predetermined number of facility pipes in the pipeline excavated across the reaching shaft, the main body is released from the fixed state and the outer diameter of the cutter head is reduced to below the inner diameter of the facility pipe. . A method for excavating a pipeline, characterized in that the main body portion is passed through the pipes of each facility in a retrograde manner and recovered from within the starting shaft. (2) A main body portion having a housing configured to be inserted into a facility pipe and housing a cutter drive mechanism; A cutter head installed next to the front of the main body,
a sealing mechanism for sealing a gap between the housing and the facility pipe; a fixing mechanism attached to the housing for releasably fixing the housing to the facility pipe;
a correction mechanism for correcting the propulsion direction of the leading facility pipe;
A pipe excavation device comprising cutter diameter converting means for reducing the outer diameter of the cutter head to be smaller than the inner diameter of the facility pipe.