JPH0749759B2 - Excavator for replacement work of aged pipe - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator for replacement work of an aged pipe that replaces a new pipe in a buried position of the aged pipe.

Conventional technology Conventionally, when burying a new pipe, the old pipe is treated as an abandoned route by burying the new pipe by another method such as an excavation method, or the old pipe is finely cut and crushed by the cutter head of the excavator. The excavation method is used in which soil is discharged with a screw together with crushed pieces, an advanced pipe and a new pipe are pressed in and propelled, the advanced pipe is recovered on the arrival side of the pipe, and the same diameter pipe is buried in the same route.

[Problems to be Solved by the Invention] In the above conventional configuration, when a pipe is buried in another route by an excavation method or the like, workability is poor. Further, even in the case of the excavation method, since the entire aged pipe is propelled while being cut and crushed, the propulsion direction of the excavator tends to be inaccurate and the propulsion speed is slow. Furthermore, when crushed fragments of the aged pipe remain in the ground to create a space in the ground, there is a problem that ground subsidence is likely to occur.

The present invention solves the above problems and provides an excavator that can be used for aging pipe replacement work that can accurately propel the direction of the excavator, obtain a high propulsion speed, and reliably prevent ground subsidence. With the goal.

Means for Solving the Problems In order to solve the above problems, the present invention, from the start pit formed on the burial line of the aged pipe to the arrival pit, the bottom of the aged pipe along the burial line. Excavation is performed so that the top and both sides remain in the center, and a new pipe is installed in the tunnel excavated from the start pit, and the propulsion jack provided in the start pit allows direct or via the new pipe to advance the new pipe. An excavator for replacement work of an aged pipe that fills the mortar in the cavity of the aged pipe that remains above the new pipe after burial, and a cutter head is rotatably provided in the front part of the front body and A rear body is flexibly connected to the rear portion via a plurality of direction correcting jacks, and the front body and the rear body are
The tip sliding contact member is provided on the outer peripheral side so that it can move freely, and a plurality of gripper devices are provided to make sliding contact with the top and both sides of the remaining aged pipe.

In the above configuration, from the start pit to the arrival pit, the excavator is excavated so that the top and both sides remain around the bottom of the aged pipe, and the slide contact member is provided by the gripper device provided in the excavator. The excavator grips the remaining aged pipe by sliding contact with the inner surfaces of the top and both sides of the aged pipe, and the excavator is controlled by the direction control while excavating. Each time it moves forward, the excavator is driven through the new pipe inserted between the propulsion jacks to drive the excavator to the reaching pit, and the new pipe is buried from the starting pit to the reaching pit, and then remains aged above the new pipe. Fill the voids in the pipe with mortar.

Therefore, since the excavator excavates mainly on the bottom of the aged pipe, it is possible to completely prevent the ground from collapsing, and by controlling the inclination angle of the front body with respect to the rear body by driving the direction correction jack, Can be easily corrected and accurate excavation can be performed. Furthermore, since the excavator excavates while gripping the remaining aged pipes through the sliding contact members by the gripper devices provided on the front and rear bodies respectively, it is possible to accurately control the position and attitude of the excavator. it can.
Further, the excavation area of the aged pipe can be made as small as possible to increase the excavation speed, and by filling the voids of the remaining aged pipe with mortar above the new pipe, ground subsidence after construction can be reliably prevented.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 is an aged horseshoe-shaped pipe (hereinafter referred to as an aged pipe), which is an example of an aged pipe, and as shown in FIG.
A horseshoe-shaped main body 1d consisting of both side walls 1b and a ceiling wall 1c on the foundation 1a
And a bottom wall 1e is provided between the lower ends of the main body 1d. The starting pit 2 and the reaching pit 3 are excavated on the burial line of the aging pipe 1 with a predetermined distance, and the aging pipe 1 in each of the pits 2 and 3 is excavated.
Will be removed.

Reference numeral 4 denotes an excavator for replacement work for excavating the bottom of the aged pipe 1 from the starting pit 2 to the reaching pit 3, and as shown in FIGS. 2 and 3, a front body 5 tiltably connected to each other within a predetermined range. A cutter head 9 having a cutter bit 7 and a roller bit 8 is rotatably disposed on the front portion of the front body 5 and a rear body 6. In this cutter head 9, a rotary cylinder 10 extending rearward is rotatably supported by a support cylinder 29 in the front body 5 via a seal member 11 and a swivel bearing 12, and a ring gear 13 is provided at a rear end of the rotary cylinder 10. The drive gear 15 of the output shaft of the cutter drive motor 14 provided in the front body 5 is meshed with the ring gear 13 to rotationally drive the cutter head 9. The front portion of the rear body 6 is fitted in the rear portion of the front body 5 via the sealing material 15 and the like so as to be tiltable to some extent, and a plurality of direction correcting jacks 16 provided on the front movement 5 are attached to the rear body 6. The front body 5 and the rear body 6 are tiltably connected to each other by being pin-connected to the connecting member 17.

The front body 5 and the rear body 6 respectively include three front gripper devices 18A, 18B, 18B and three rear gripper devices 19A, which guide the excavator 4 by slidingly contacting the remaining portions of the cut and crushed aging pipe 1. 19B, 19B
And are provided. That is, the front gripper device 18A, 18B,
18B is a jack 20 having an operating end that can freely move upward and downward with respect to the axis of the front body 5 and downwards on both sides, and a tip surface attached to the operating end so that the tip surface is the inner surface of the top wall 1c and the cutting surface of the foundation portion 1a. And a sliding contact member 21 that is in sliding contact with each other. Further, the rear gripper devices 19A, 19B, 19B are provided with a jack 22 having an actuating end 22a that can be retracted upwards and laterally around the axis of the rear body 6, and a tip end surface attached to the actuating 22 end a. Sliding members that slidably contact the inner surface of the wall 1c and the cutting surface of the side wall portion 1b, respectively.
Composed of 23 and. Further, in the gripper devices 18A and 19A facing upward, the jacks 20 and 22 are provided on the skin plate 5 respectively.
The gripper device 18B, which is fixed through the a and 6a and faces sideways,
In 19B, the guide members 21 and 23 are provided so as to project from the openings formed in the skin plates 5a and 6a.

Reference numeral 24A denotes a first earth discharging conveyor which is arranged from the inside of the support cylinder 29 of the cutter head to the front portion of the rear body 6, and 24B denotes a second earth discharging conveyor which is arranged rearward from the rear body 6. In addition,
At the rear position of the second gripper device 24B, the rear body 6 is detachably connected to the forward rear body 6A and the rear rear body 6B.
In 6B, hydraulic unit 25, lighting 26, TV camera 27,
A control room 28 and the like are provided.

In FIG. 1, 31 is a starting stand of the excavator arranged in the starting pit 2, 32 is the excavator 4 using the reaction force receiving member 33 as a reaction force receiving member.
A propulsion jack device for propelling the excavator 4 by expanding and contracting in the traveling direction of the excavator 4 and excavating through a new fume pipe 34 that is inserted between the rear end of the rear body 6 of the excavator 4 and every time it advances forward a fixed distance. The machine 4 can be propelled. A bypass pipe 35 connects the existing pipes 36 to each other during construction, and a pump 37 is interposed therebetween. Reference numeral 38 is a mortar pump for injecting the mortar 39 through the mortar supply pipe 40 into the void 41 of the remaining aging pipe 1.

Next, the procedure of the replacement method for the aged pipe 1 will be described.

[1] As shown in FIG. 1 (a), the starting pit 2 and the reaching pit 3 are excavated on the burying line of the aging pipe 1 at a predetermined distance.
At the same time as cutting and removing the aged pipe 1 in each pit 2 and 3, both existing pipes 36 and 36 are connected by a bypass pipe 35, and pumping is performed by a pump 37. Next, the starting table 31, the propulsion jack 32, and the reaction force receiving member 33 are installed in the starting pit 2 and the starting table 31
The front body 5 of the excavator 4 and the forward rear body 6A are provided on the top of the bottom wall of the aging pipe 1.
It is placed facing 1e. Then, the cutter driving motor 14 of the excavator 4 is driven, the cutter head 9 is rotated to extend the propulsion jack device 32, and the foundation portion 1a of the aging pipe 1, the side wall 1b of the main body 1c, and a part of the bottom wall 1c. The ground and the ground are excavated (cut), and earth and sand and crushed pieces are discharged to the outside from the first and second earth discharging conveyors 24A and 24B through the start pit 2. At this time, the sliding contact members 21, 23 of the upper gripper devices 18A, 18B are held at the positions in sliding contact with the inner surface of the ceiling wall 1c as shown by phantom lines in FIGS. Sliding contact members 21 and 23 of devices 18B and 19B
Are held at positions where they are in sliding contact with the cut surfaces of the base portion 1a and the side wall 1b cut by the cutter head 9, respectively, whereby the excavator 4 is gripped by the remaining aged pipe 1 and the cutting reaction force of the cutter head 9 is supported. At the same time, it is guided in the direction of excavation. After propelling for a predetermined distance, the jacking device
32 is contracted to connect the succeeding rear body 6B to the rear portion of the forward rear body 6A to perform further propulsion.

[2] As shown in FIG. 1 (c), when the excavator 4 propels the propellant for a predetermined distance, the propelling jack device 32 is contracted again, and the new fume pipe 34 is inserted between the excavator 4 and the propelling jack device 32. , The propelling jack device 32 is extended again to propel the excavator 4. By repeating this, the excavator 4 can be propelled to the reaching pit 3 as shown in FIG. 1 (c). When changing the direction of the excavator 4 during propulsion, the direction correcting jack 16 is operated to tilt the front body 5 with respect to the rear body 6,
The direction of propulsion can be changed. At this time, it is also possible to operate the jacks 20 and 22 of the gripper devices 18A, 18B, 19A and 19B to displace the positions of the sliding contact members 21 and 23.

[3] As shown in FIG. 1 (d), the propulsion jack device 32
By pushing the newly installed fume pipe 34, the excavator 4
Is taken out from the reaching pit 3, and the starting table 31, the propulsion jack device 32, and the reaction force receiving member 33 are taken out from the oscillating pit 2.

[4] As shown in FIG. 1 (e), both ends of the new fume pipe 34 and the remaining old pipe 1 are closed by the closing plates 42, and the mortar pump 38 is arranged in the starting shaft 2. The mortar supply pipe 40 connected to this mortar pump 38 is passed through the closing plate 42, and the void 41 of the remaining aging pipe 1 is formed from the inside of the new fume pipe 34 through the through hole 43 formed on the upper surface of the intermediate part of the new fume pipe 34.
, And the mortar 39 is filled in the void 41.
After the mortar 39 is solidified, the closing plate 42 is removed, and FIG. 1 (f) is shown.
The installation of the new fume pipe 34 is completed as shown in FIG.

According to the above-described embodiment, the excavator 4 excavates the bottom wall 1e of the aged pipe 1 as a center, and the excavator 4 uses the gripper devices 18A, 18B, 19A,
The sliding contact members 21 and 23 of 19B are slidably contacted with the inner surface of the top wall 1c of the remaining aging pipe 1, the excavation surface of the foundation portion 1a and the excavation surface of the side wall 1b, so that they can be guided while gripping, so that construction is possible without collapsing the ground. In addition, the aging pipe 1 can be accurately propelled along the buried line, and the digging portion of the aging pipe 1 is small, so that the digging speed can be increased. In addition, since the mortar 39 is filled in the space 41 below the remaining aged pipe 1 above the newly installed fume pipe 34, the ground subsidence after construction is very small and the strength against the load from above is high.

Since there is no ground collapse, the equipment inside the excavator 1 can be made waterproof so that construction during rain, wetlands, and soft ground can be handled.

As described above, according to the present invention, by excavating mainly at the bottom of the aged pipe, it is possible to completely prevent the ground from collapsing and to perform the excavation. The excavator is excavated while the sliding contact member of the gripper device installed is slidably in contact with the inner surfaces of the top and both sides of the remaining aged pipe, and the excavator is advanced. Can be controlled easily. In addition, by tilting the front body with respect to the rear body by the direction correcting jack, the excavation direction can be arbitrarily controlled.
Also, the excavation speed can be increased by reducing the excavation area of the aged pipe as much as possible. Furthermore, by filling mortar in the voids of the remaining aged pipe above the new pipe, ground subsidence after construction can be reliably prevented, and high strength can be achieved against loads from above.

[Brief description of drawings]

1 (a) to 1 (f) are schematic vertical sectional views for explaining the procedure of the replacement method, FIG. 2 is a vertical sectional view of an excavator, and FIG. 3 is a front view thereof. 1 …… Aged horseshoe-shaped tube (aged pipe), 1a …… Foundation, 1b…
… Side wall, 1c… Top wall, 1e… Bottom wall, 2… Start pit, 3…
… Reaching shaft, 4 ... Excavator, 5 ... Front body, 6 ... Rear body, 9
…… Cutter head, 16 …… Direction correction jack, 18A, 18B
...... Front gripper device, 19A, 19B …… Rear gripper device, 20,22 …… Jack, 21,23 …… Sliding contact member, 32 …… Propulsion jack device, 33 …… Reaction force receiving member, 34 …… Newly installed fume pipe, 38 ... mortar pump, 39 ... mortar.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Hashimoto 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Hitachi Shipbuilding Co., Ltd. (72) Hidenori Tanimura 1-6-14 Edobori, Nishi-ku, Osaka City, Osaka Prefecture Within Hitachi Zosen Corporation (56) Reference JP-A-63-70795 (JP, A) JP-A-62-80384 (JP, A) JP-A-62-33996 (JP, A) JP-A-58-62289 ( JP, A)

Claims (1)

[Claims] [Claim 1] From the starting pit formed on the burial line of the aged pipe to the arrival pit, along the burial line, excavating along the burial line so that the top and both sides remain, centering on the bottom of the aged pipe, and excavating from the starting pit. In addition to installing a new pipe in the tunnel, it was excavated directly or through the new pipe by a propulsion jack installed in the starting pit, and after burying the new pipe, mortar was placed in the void part of the aged pipe remaining above the new pipe. It is an excavator for replacement work of old pipes to be filled.A cutter head is rotatably provided on the front part of the front body, and the back body is bendable via a plurality of direction correcting jacks on the rear part of the front body. A plurality of gripper devices, which are connected to each other, are provided on the front body and the rear body, respectively, and a tip sliding contact member is provided on the outer peripheral side so as to be able to move forward and backward so as to slidably contact the top part of the remaining aged pipe and the inner surfaces of both side parts respectively. Aging characterized by Excavator for pipe replacement work.