JPH10231686A - Underground pipe laying method by small diameter jacking method and underground boring machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To carry out the boring and propelling of an underground-laid pipe simultaneously and shorten the term of works and improve efficiency by mounting a guide ring onto the head of a pipe to be propelled underground and supporting a cutter in a reversible manner, and propelling the cutter and the pipe simultaneously while excavating the natural ground with the cutter. SOLUTION: A cylindrical guide ring 126 is fitted to the head of a vinyl chloride pipe 66, a head cutter 82 is arranged, a press ring 68 is mounted onto the rear end of the vinyl chloride pipe 6, and the vinyl chloride pipe 66 is fixed to a pipe support 142. The rotary output shaft 80 of the main body 30 of a propeller is taken out before a main push spreader 56, connected to a relay soil discharge shaft joined to the head cutter 82 and then the natural ground is bore while rotating the cutter 82, and the main push spreader 56 is advanced. As a result, a main slider 55 advances, the main push spreader 56 propels the vinyl chloride pipe 66 through the press ring 68, pushing the cutter 82 and the vinyl chloride pipe 66 simultaneously. Therefore work becomes efficient and thereby shortens the term of works.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for propelling small-diameter pipes, and particularly to a relatively short section such as a sewage branch pipe connecting a yard in a residential land for sewage and a sewage main pipe, electric power, gas, water supply, and telephone. The present invention relates to an underground pipe laying method and an underground excavation apparatus optimal for laying a pipe underground.

[0002]

2. Description of the Related Art Conventionally, in the piping work of a sewage branch pipe connecting a house yard of a home and a sewer main pipe, after the main pipe work is completed, the pipe is buried underground by excavation. That is, as shown in FIG. 15, after excavating an open-cut structure along the road 10 to bury the sewer main pipe 12 and install the manhole 13, the road 10 is backfilled. And, for example, A house 14
When installing sewage branch pipes 22 and 24 connecting the yard 20 of the house 16 or the yard 20 of the house B and the sewer main pipe 12, a trench for burying is excavated from a road by an open-cutting method, and the drain is drained into the cut-off groove. After arranging the branch pipes 22 and 24, the cut grooves are filled back.

[0003]

However, in the burial work of the sewage branch pipes 22, 24 by the open-cutting method, the external structures such as the fences 26, 28 hinder, and a part of these external structures are removed. In many cases, it is difficult to perform construction. Also,
When restoring a trench by refilling it, it is not possible to install the same color as the tile on the removed road surface, and there are many complaints from owners. In addition, the open-cutting method requires restoration of road pavement and the like, which increases not only the number of steps but also the cost. And, after burying the sewer main pipe 12, the sewage branch pipe 22,
24, the construction period is also long.

[0004] Further, it is conceivable to use an underground excavation device in order to avoid excavation work. However, a conventional underground excavation device requires a shaft having a wide length and width to be installed, Was heavy and difficult to install on sewer mains and in manholes. Moreover, underground propulsion of pipes by the conventional underground excavation device is often connected in a bent state at the pipe joint when propelling by adding pipes, causing an increase in propulsion force, distortion of pipes, breakage, There were problems such as poor quality due to insufficient inclination of the laid pipe.

The present invention has been made to solve the above-mentioned drawbacks of the prior art, and has as its object to excavate the ground with a cutter device and simultaneously propel the laid pipe so that the pipe can be laid underground. I have. Another object of the present invention is to provide an underground propulsion device that can easily correct the direction and line of propulsion, for example, up, down, left, and right.

[0006]

In order to achieve the above object, a method of laying an underground pipe by a small-diameter propulsion method according to the present invention is to provide a guide ring for protecting a pipe at the tip of a pipe for propelling underground. Attached to support the cutter device so that it can rotate forward and backward, transmit the rotational driving force of the excavating mechanism arranged in the starting pit to the cutter device to excavate the ground, and simultaneously connect the cutter device and the pipe. It is configured to excavate. The cutter device can be excavated while being moved in the front-rear direction at an arbitrary cycle according to the soil quality of the ground at which the cutter device is excavated. Alternatively, after the cutter device excavates the excavated earth and sand into the destination pit while holding the excavated earth and sand in the pipe, the excavated earth and sand retained in the pipe may be discharged into the start pit when the cutter apparatus is collected in the starting pit. Furthermore, after arranging a protective cylinder that can be inserted and removed to protect the inner surface of the pipe inside the pipe, a discharging mechanism is provided at the rear of the cutter device, and after digging to the destination pit while continuously discharging the starting pit side, When the cutter device is collected in the starting pit, the protection cylinder disposed in the pipe may be moved to the starting pit side to collect.

An underground excavation device according to the present invention for carrying out the above-described underground pipe arranging method includes a guide ring for protecting a pipe mounted on a tip of a pipe for propelling underground so as to be rotatable forward and backward. A cutter device that is supported, a propulsion mechanism that is disposed in the starting pit and is capable of simultaneously propelling the pipe and the cutter device,
A slide mechanism that is provided to be relatively movable with respect to the propulsion mechanism and that can move the cutter device in the front-rear direction at an arbitrary cycle; and a rotation that is provided to the slide mechanism and applies a rotational force to the cutter device to excavate the ground. And a drive source having an output shaft. The cutter device can be provided with a movable cutter bit that can be raised and lowered. Then, the slide mechanism is provided with a cam mechanism that can be attached to an arbitrary rotation position, the cutter mechanism is moved back and forth at a predetermined cycle by this cam mechanism, and when the cutter apparatus is retracted, the movable cutter bit is brought into contact with the guide ring to fall down, The diameter of the ground excavation by the cutter device is reduced so that the direction of the guide ring can be corrected and the alignment of the pipe to be propelled can be corrected. In addition, the propulsion mechanism has a long stroke mechanism that can be extended and retracted in a plurality of stages on each of the front side and the rear side of the main body, so that the predetermined propulsion length of the pipe can be performed in one stroke of the long stroke mechanism. Good. Furthermore, the propulsion mechanism is provided with a main push spreader for propelling the pipe, and a movable support base capable of fixing the pipe coaxially with the rotary output shaft is disposed in front of the main push spreader, and the main push spreader is fixed forward. It is possible to have a return mechanism for simultaneously moving the movable support while simultaneously maintaining a constant interval at the position where the propulsion has been performed, and simultaneously returning the movable support with the return of the original push spreader unit to the initial position. .

[0008]

The underground pipe laying method of the present invention constructed as described above supports the cutter device at the tip of the pipe laid in the ground to protect the tip of the pipe so that the cutter device can be rotated forward and backward. Then, while excavating the ground with the cutter device, the cutter device and the underground laying pipe are simultaneously propelled, so that the drilling and the underground laying pipe can be simultaneously performed. The efficiency of the underground installation work of such pipes can be greatly improved, the construction period can be shortened, the cost can be reduced, and the working environment can be improved. If the driving source and the propulsion mechanism are provided on the turning table, the excavation direction and the propulsion gradient can be set regardless of the arrangement state of the base.

[0009] When the cutter device is excavated while being moved in the front-rear direction at an arbitrary cycle in accordance with the soil characteristics of the ground to be excavated, the cutter device can be prevented from being stuck, and a smooth drilling can be performed. In addition, after digging to the destination pit while holding the excavated soil by the cutter device in the pipe, when the cutter device is collected in the starting pit, the excavated earth and sand retained in the pipe is discharged into the starting pit. Work can be simplified. Furthermore, after arranging a protective cylinder that can be inserted and removed to protect the inner surface of the pipe inside the pipe, a discharging mechanism is provided at the rear of the cutter device, and after digging to the destination pit while continuously discharging the starting pit side, When the cutter device is collected in the starting pit, if the protection tube arranged in the pipe is moved to the starting pit side and collected,
Continuous soil removal is possible without damaging the inner surface of the pipe.

Further, according to the underground excavation device of the present invention,
In addition to providing a cam mechanism for moving the cutter device in the front-rear direction at a predetermined cycle, a movable cutter bit is provided in the cutter device, and when the cutter device is retracted inside the pipe, the movable cutter bit contacts the guide ring and moves forward. By adopting the falling mechanism, the excavation diameter can be made smaller than the set diameter, and the excavation direction and the propulsion alignment of the propulsion pipe can be easily corrected. In addition, by providing a movable support base and fixing the tube coaxially with the rotary output shaft, the propulsion force is accurately transmitted in the excavation direction while preventing deflection of the propulsion tube, and bending at the time of connection of the tube can be prevented. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an underground propulsion device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a side view showing a main body of the underground excavation device according to the embodiment of the present invention, FIG. 4 is a plan view thereof, and FIG.
Is a partially enlarged plan view. In these figures, the excavating device main body 30 has a base 32 installed in an excavation groove in which the sewer main pipe 12 serving as a starting pit is disposed, and a swivel table 34 is pivotally mounted on the base 32. It is. A fixing mechanism such as a fixing bolt 36 is provided between the base 32 and the turning table 34 so that the turning table 34 can be fixed to the base 32 at an arbitrary turning position. An angle scale 38 is provided on the upper surface of the base 32 along the arc edge of the swivel table 34.
Is provided. The turning table 34 has a pair of indices 40 on both side edges in the diametric direction.
Slide rail 42 fixed to the upper surface of the swivel table 34
, That is, the excavation direction can be set. In the case of the embodiment, the slide rail 42 is formed so as to have a total length of 1 m or less, and can be easily arranged in a narrow excavation groove.
It allows you to turn smoothly.

At the four corners of the base 32, level jacks 44 are arranged via brackets 43. Each of these level jacks 44 can be independently expanded and contracted so that the horizontality and the elevation angle of the base 32 can be adjusted. Fixed jacks 46 are provided on the four corner side surfaces of the base 32. A fixed spreader 48 provided at the tip of these fixed jacks 46 is pressed against the ground of the excavation groove, so that the excavation device main body 30 is connected to the excavation groove. It can be fixed inside.

On the other hand, slide rails 42 fixed to the turning table 34 are provided on both sides of the turning table 34. At the upper part of these slide rails 42, a propulsion jack 50 constituting a slide mechanism is provided on the rear side (the right side in FIG. 3). These propulsion jacks 50
As shown in FIG. 3, a pair of jacks 50a, 50
and a long stroke mechanism in which the piston rod expands and contracts in the opposite direction. The rod end of the lower jack 50b of the propulsion jack 50 is
2 is pivotally connected via a pin 54 to a fixed bracket 52 on the rear end side. Also, the upper jack 5 of the propulsion jack 50
Numeral 0a is pivotally connected via pins 60 to fixing brackets 58 attached to both sides of a main push spreader 56 provided at a front portion of a main slider 55 provided on the slide rail 42. As shown in FIG. 4, these jacks 50a and 50b are telescopically extended and retractable single-stage rods 62.
And a two-stage rod 64, so that a large stroke length can be obtained compared to the length of the constituent cylinder body.

The main slider 55 is slidable in the left-right direction in FIG. 4. A main push spreader 56 for propelling a vinyl chloride pipe 66, which is a sewage branch pipe laid underground, is attached to the front end. It is. Main push spreader 5
6 is open at the top, engages with the lower half of the press ring 68 fitted to the rear end of the PVC pipe 66, and propells the PVC pipe 66 through the press ring 68 by the thrust of the propulsion jack 50. It is supposed to. That is, by operating the propulsion jack 50, the propulsion jack bracket 58 and the main push spreader 56
The main slider 55 can be reciprocated along the longitudinal direction of the slide rail 42, and the vinyl chloride pipe 66 can be advanced through the main push spreader 56 and the press ring 68. Further, the main push spreader 56 has a projecting portion 57 on the rear end side, so that excavated earth and sand can be discharged from the gap between the projecting portions 57 into the starting shaft as described later.

As shown in FIG. 5, a sub-slider 70 is provided on the main slider 55. The sub-slider 70 is relatively movable with respect to the main slider 55 and has a structure capable of moving along a slide rail inscribed in the main slider 55. A drive motor 74 as a drive source is disposed above the sub-slider 70 via a speed reducer 72. As shown in FIG. 5, the heads of a pair of slide jacks 76 mounted on the main slider 55 are fixed to the speed reducer 72. The slide jack 76 includes a bracket 7 in which a clevis portion at a rod end is fixed to the main slider 55.
The sub-slider 72 is reciprocally movable in the left-right direction in FIG. 4 via a bracket 78 and a speed reducer 72.

The speed reducer 72 is provided with a rotation output shaft 80 which can be rotated forward and backward in a protruding manner. This rotation output shaft 80 is
As will be described later in detail, it is for rotating a cutter device constituting a tip excavation mechanism of the excavating device, and can be connected to the tip cutter device 82 shown in FIG. The rotary output shaft 80 can be moved in the axial direction by a slide jack 76. The rotary output shaft 80 has a rear end threaded portion for transmitting the rotational driving force of the rotary output shaft 80 to the cutter device 82 and a rear end screw portion. And can also be used for attaching and detaching between intermediary earth discharging shafts to be added later.

The digging apparatus main body 30 is constructed so that the upper and lower sides of the main body can be easily disassembled and assembled. That is, the rod of the propulsion jack 50 is
4 can be easily detached from the bracket 52 by pulling it out. By removing the propulsion jack 50 from the bracket 52, the slide rail 4
2. The lower part of the main body including the swivel table 34, the base 32, the main body fixing jacks 44 and 46, and the upper part of the main body including the propulsion jack 50, the main slider 55, the drive motor 74, etc. can be easily separated. Further, when assembling the upper body and the lower body, the rod end of the propulsion jack 50 is connected to the bracket 52 by the pin 54 so that the assembly can be easily performed. Therefore, by disassembling the propulsion device main body 30, it can be transported by human power, and can be easily carried into or stored at the site.

As shown in FIG. 1, the tip cutter device 82 includes a cutter front portion 86, a cutter rear portion 88, and a relay earth discharging shaft 84. The cutter front 86
A center cutter 90 and an intermediate cutter 92 are provided on a cylindrical cutter shaft 94. A movable cutter bit 98 is provided at the rear end of the cutter 88 at the base end of a cylindrical cutter shaft 96 fixed to the relay discharging shaft 84. Cutter front 86
And the cutter rear portion 88 are integrated by screwing the cutter shafts 94 and 96 together. Then, the cutter shaft 94,
As described later, the movable cutter bit 9 is provided around the 96.
6 is provided with a slide sleeve 100 for restoring the state of FIG. A spring 102 is disposed between the rear end surface of the cutter shaft 94 on the front end side and the inner surface on the rear end side of the slide sleeve 100. This spring 102
Biases the slide sleeve 100 rightward in FIG.
The movable cutter bit 98 which has fallen forward as shown in FIG.
Return as shown. Further, if necessary, compressed air or high-pressure water is injected into the slide sleeve 100 so that the movable cutter bit 98 can be reliably restored.

That is, a through hole 104 is provided in the center of the cutter shaft 96, and compressed air or high-pressure water is supplied to the through hole 104 via a hollow relay earth discharging shaft 84 (see FIG. 6). It has become so. A flow path 106 is also formed at the center of the cutter shaft 94 on the tip side. Further, the front end of the rear cutter shaft 96 is provided with the front end of the flow path 10.
A check valve 108 having a T-shape in a side view inserted in 6 is disposed so as to be movable in the axial direction. The check valve 108 is urged rearward by a spring 110 disposed in the flow passage 106 so that the tip of the through hole 104 can be closed. When the compressed air or high-pressure water supplied to the through hole 104 is supplied, the check valve 108 is moved forward, and the slide sleeve 1 is moved between the cutter shafts 94 and 96.
00, the slide sleeve 100 is moved backward to restore the movable cutter bit 98. Further, a discharge hole 112 is formed in the cutter shaft 94 in front of the intermediate cutter 92 in a radial direction so that compressed air or high-pressure water can be injected into the ground according to the soil quality of the ground. . That is, a passage (not shown) is formed between the inner peripheral surface of the cutter shaft 94 and the outer peripheral surface of the check valve 108.
The compressed air or high-pressure water supplied to the ground is ejected from the discharge well 112 to the ground, so that the intermediate cutter 92 and the movable cutter 98 can easily excavate the ground.

As shown in FIG. 6, a joint 114 is provided at the rear of the relay earth discharging shaft 84, and the rotary output shaft 80 is screwed to the joint 114.
Further, the distal end joint portion 118 of the relay earth discharging shaft 116 to be added shown in FIG. 7 can be connected to the joint portion 114 by screwing. A rear end joint 114 is also provided at the rear end of the relay discharging shaft 116 so that a plurality of relay discharging shafts 116 can be sequentially connected. On the outer peripheral surfaces of the relay discharging shafts 84 and 116, discharging blades 120 serving as a discharging mechanism are spirally provided. Also, the mounting angles of the cutters and the like are provided in diametric directions orthogonal to each other. However, only one movable cutter bit 98 is provided so that the propulsion alignment of the pipe to be laid can be corrected.

A movable cutter bit bracket 122 is attached to the rear end portion of the cutter 88 and the tip of the discharging blade 120, and a movable cutter bit 98 is attached to a base end of the bracket 122 by a pin 124. The movable cutter bit 98 is axially movable relative to the vinyl chloride pipe 66 integrally with the relay earth discharging shaft 84 passed through the vinyl chloride pipe 66. When the movable cutter bit 98 is pulled into the inside, the back surface of the movable cutter bit 98 comes into contact with the curved surface portion 128 of the guide ring 126 attached to the tip of the vinyl chloride pipe 66, and
1 is rotated around the counterclockwise direction in FIG. 1, and as shown in FIG. 2, the tip portion is tilted forward. The diameter can be changed. In the case of the embodiment, the vinyl chloride pipe 66 is formed to have a length of about 580 mm, which is the optimum length for the cutting width of the sewer main pipe part, so that it can be easily excavated even from a small shaft.

A cylindrical guide ring 126 is attached to the tip of the vinyl chloride tube 66 disposed around the tip cutter device 82. The guide ring 126 has a structure in which an inner ring 130 and an outer ring 132 are screwed together. The guide ring 126 has an inner peripheral portion formed into a curved surface 128 and a ring-shaped insertion groove 134 formed in a rear end surface. The tip of the vinyl chloride pipe 66 is inserted into the insertion groove 134. And guide ring 1
26 protects the ground from damage due to the propulsion of the tip of the vinyl chloride pipe 66, and disposes the discharging blades 12 on the inner peripheral surface.
0 is in sliding contact with the outer peripheral portion of the relay discharge shaft 84, and the cutter device 82 is rotatably supported via the discharge blades 12 to prevent the cutter device 82 from swinging. It is a guide surface for guiding directional movement.

Further, the rear joint portion 1 of the leading relay discharging shaft 84
The relay discharge shaft 116 connected to 14 is as shown in FIG. That is, the relay discharging shaft 116 includes the relay shaft main body 136, the discharging blade 120, the front joint 118, and the rear joint 114. Further, the relay shaft main body 136 is used as a water injection hole to the ground using a hollow shaft, and at the same time, the weight is reduced. The other end of the earth discharging shaft 116 is connected to the front joint 118 and the rear joint 114.
A screw is provided to connect the
6 can be screwed together.

Reference numeral 138 shown in FIG. 7 denotes a subsequent vinyl chloride pipe connected to the above-mentioned vinyl chloride pipe 66 at the tip. The vinyl chloride pipe 138 is formed to have a length of about 580 mm similarly to the vinyl chloride pipe 66, the relay discharge shaft 116 is passed through, and the tip is inserted into the rear side of the joint 140 and adhered. It is fixed. The rear part of the PVC pipe whose propulsion has been completed on the front side is inserted into the joint 140, and the joint 140 is bonded and fixed. Further, the relay discharging shaft 116 has no cylindrical shape like the relay discharging shaft 84, and the through-hole 1 formed in the rotary output shaft 80.
Compressed air or high-pressure water is supplied via 41 (see FIG. 6). As shown in FIG. 8, a pipe joint 143 is mounted on the back of the speed reducer 72 coaxially with the rotary output shaft 80. A supply pipe for compressed air or high-pressure water is connected to the pipe joint 143. By doing
Compressed air or high-pressure water can be supplied to the tip cutter device 82.

Also, a vinyl chloride pipe 1 connected in the following order:
In order to facilitate the connection of the connection 38 and the connection of the relay discharge shaft 116 disposed in the vinyl chloride pipe 138, as shown in FIG. 3, the pipe support 142 is disposed in front of the main slider 55, The axis of the main push bracket 56 at the tip of the main slider 55, that is, the axis of the rotary output shaft 80 and the axis of the tube support 142 are arranged so as to be the same axis. The tube support 142 has a movable support stand 144 on which the vinyl chloride tube 138 is arranged and fixed, and the slide rail 42.
Is slidably arranged in A tube retainer 146 is provided at the tip of the movable support stand 144. This pipe retainer 1
Numeral 46 is pivotally connected via a pin 150 to a bracket 148 fixed to one side of the movable support stand 144, so that it can rotate in a direction perpendicular to the plane of FIG. Then, the pipe retainer 146 is arranged so as to straddle the upper part of the PVC pipe 138 arranged on the movable support stand 144 by rotating the pin holder 150 as a center, and the PVC holder 146 is moved from above the movable support stand. 144, and fixed coaxially with the preceding vinyl chloride pipe 66 or vinyl chloride pipe 138 and rotary output shaft 80. By arranging the vinyl chloride pipe 138 for relay on the pipe support 142 and the main pushing spreader 56, the joining and connection work of the connected vinyl chloride pipe 138 can be performed more easily. Further, as the propulsion jack 50 extends, the main push spreader 56 at the front end of the main slider 55 approaches the pipe retainer 146, and when the main push spreader 56 performs a certain amount of propulsion, the main push spreader 56 is separated from the main push spreader 56 by a spacer or the like. The distance from the pipe retainer 146 is maintained at a constant interval, so that they are simultaneously moved in the ground direction. Further, when the propulsion jack 50 retreats to the initial position, the pipe support 142 returns to the initial position by a return mechanism constituted by a spring or the like.

9 and 10 show specific examples of the propulsion jack 50. FIG. 9 shows a flow path of hydraulic oil.
FIG. 10 is a sectional view of the lower jack 50b, and the upper jack 50a is similarly configured. In these figures, the propulsion jack 50 is formed integrally with a jack main body 150 serving as a cylinder tube of the upper jack 50a and the lower jack 50b. And the upper jack 5
In Oa, a head side port 152a is formed in the head side portion. The head side port 152a is connected to the flow path 154.
Through the head-side port 152b of the lower jack 50b
When the propulsion jack 50 is extended,
As shown by an arrow 154, the operating oil is supplied to the head-side port 152a. Further, a rod-side port 158b is formed on the end surface of the two-stage rod 64b of the lower jack 50b (see FIG. 10), and when the first-stage rod 62 and the two-stage rod 64 are pulled into the jack main body 150, the drawing is performed. As indicated by an arrow 160 in FIG. 9, hydraulic fluid is supplied to the rod-side port 158b.
The hydraulic oil supplied to the rod side port 158b is
It flows into the two-stage rod 64a of the upper jack 50a via a flow path (not shown). Further, the jack body 150 has a pressure oil chamber 162 formed on the outer peripheral surface of the single-stage rod 62b on the rod tip side of the lower jack 50b.
b (see FIG. 10) is provided with a port 164b. This port 164b communicates with a port 164a for supplying hydraulic oil to the pressure oil chamber 162a of the upper jack 50a via a flow path 166.

The single rod 62 (62a, 62b) has a cylindrical shape as shown in FIG. 10, and a cylindrical double rod 64 is inserted therein. A flow path 172 is provided in the piston portion 170 of the first-stage rod 62 so as to penetrate in the axial direction. The hydraulic oil flowing from the port 152 flows into the inside of the first-stage rod 62, and
The hydraulic pressure can be applied to the rear end face of the fourth piston portion 174. Further, between the inner peripheral surface of the first rod 62 and the outer peripheral surface of the second rod 64,
4 is formed with a pressure oil chamber 176 for drawing in the pressure oil chamber 4. The pressure oil chamber 176 communicates with a center hole 180 of the second rod 64 via a radial port 178 formed in the second rod 64. Further, a rod 182 fixed to the head side of the jack body 150 is inserted into the center hole 180. The rod 182 has a flow path 184 at the center, and when the first-stage rod 62 is extended, the flow path 184 is connected to the head-side port 15 via a radial port 186.
It is designed to communicate with 2.

The underground laying of the vinyl chloride pipe according to the embodiment constructed as described above is performed as follows. First,
The lower part of the excavating device main body 30 including the slide rails 42 is carried into an open-cut groove serving as a starting shaft in which the sewer main pipe 12 is arranged. Then, the elevation angle and the propulsion direction of the base 32 are adjusted by the level jack 44 and the swivel table 34 so as to reach the hole for installing the in-house pit serving as the reaching shaft, and the main body fixing jack 46 adjusts the elevation angle and the propulsion direction of the base 32.
The lower part of the body of No. 0 is fixed in the excavation groove. At this time, when the digging direction is greatly oblique to the longitudinal direction of the cut groove, the turning table 34 is turned, the slide rail 42 is readjusted to the target direction, and the turning is performed by the fixing bolt 36 of the turning table 34. The table 34 is fixed to the base 32.

Next, the rod end clevis portion of the propulsion jack 50 is attached to the bracket 52 via the pin 54, and the upper part of the main body is assembled to the lower part of the main body. After that, the tip cutter device 82 passed through the vinyl chloride pipe 66 is arranged on the front side of the main push spreader 56, and the press ring 68 is attached to the rear end of the vinyl chloride pipe 66, and the vinyl chloride pipe 66 is fixed to the pipe support 142. I do. Further, the slide jack 76 is operated to project the rotation output shaft 80 of the propulsion device main body 30 forward of the main push spreader 56, and is screwed to the rear end joint portion 114 of the relay discharge shaft 84 joined to the front end cutter device 82. And connect them. Then, when the two are connected, the drive motor 74 is driven to rotate the cutter device 82, and at the same time, the hydraulic oil is supplied to the head-side port 152 of the propulsion jack 50 to operate the cutter device 82. While drilling, the original push spreader 56 is advanced. Thereby, the main slider 55
Moves forward, the main pushing spreader 56 propels the vinyl chloride pipe 66 through the press ring 68, and the cutter device 82 and the vinyl chloride pipe 66 are simultaneously excavated.

Head-side port 152 of propulsion jack 50
The hydraulic oil supplied to the first stage a acts on the rear end face of the piston portion 174 of the second stage rod 64 via the flow path 172 formed in the piston portion 170 of the first stage rod 62, and pushes the second stage rod 64 out of the jack body 150. To extend. And
When the piston portion 174 of the double rod 64 extends to the tip of the single rod 62, the piston portion 174 pulls the single rod 62 out of the jack body 150. When the piston 170 of the first rod 62 moves forward from the port 186 to open the port 186, and when the piston 174 of the second rod 64 moves forward of the rod 182, the first rod 62 passes through the flow path 172. The hydraulic oil that has flowed into the cylinder 62 is returned to the rear end face side of the piston 170 via the flow path 184 and the port 186, and further extends the single-stage rod 62.

When the vinyl chloride pipe 66 has been advanced by a predetermined amount, the rod portion of the propulsion jack 50 is retracted, the tip cutter device 82 is slightly retracted, and the connection between the rotary output shaft 80 with screw and the relay discharging shaft 84 is established. To release. Further, the connection may be released by using the slide jack 76 together. Thereafter, hydraulic oil is supplied to the rod-side port 158 and the port 164 of the propulsion jack 50 to further retract the rods 62 and 64, and the propulsion device main body is kept while the tip cutter device 82 and the vinyl chloride pipe 66 are left on the ground. 30 is retracted to the initial position.

The hydraulic oil supplied to the rod side port 158 flows into the pressure oil chamber 176 through the center hole 180 of the two-stage rod 64 and the port 178, and acts on the front side of the piston 174 to apply pressure to the hydraulic oil chamber 176. Connect the step rod 64 to the jack body 15
Push it into 0. Further, the pressure oil chamber 1 is connected via the port 164.
The hydraulic oil supplied to the piston body 62 exerts a pressure on the front side of the piston part 170 to move the single-stage rod 62 to the jack body 15.
Push it into 0. And add PVC pipe 13
8 is connected to the rear end joint 114 of the relay discharging shaft 84 of the tip cutter device 82, and the PVC pipe 138 is fixed to the pipe support 142, and the PVC is fixed. The tip of the pipe 138 is inserted into the joint 140 of the vinyl chloride pipe 66 left on the ground, and is adhesively fixed. Further, the rotation output shaft 80 of the propulsion device body 30
Is connected to the rear end joint portion 114 of the relay earth discharging shaft 116, and while drilling holes in the same manner as described above,
38 is excavated together with the cutter device 82. In addition, the earth and sand excavated by the cutter device 82 is transferred to the relay earth discharging shaft 8.
4 and 116, are sequentially sent rearward by the discharging blades 120 provided at 116, and are continuously discharged from the rear end of the PVC pipe 138 into the starting shaft.

Thereafter, in the same manner as described above, the relay discharging shaft 11
6 and a vinyl chloride pipe 138 are successively added, and a hole is drilled up to a hole which becomes a reaching shaft. When the leading PVC pipe 66 reaches the hole, the relay discharging shaft 84 and the tip cutter device 82 are pulled back to the inside of the excavation groove, and the number of relay discharging shafts 116 added from the propelled PVC pipe is added. Are unscrewed at the respective joints 114 and 118 and sequentially extracted. When the tip cutter device 82 is taken out, the insides of the PVC pipes 66 and 138 are cleaned, and the PVC pipe 138 at the rear end and the sewer main pipe 12 are connected by an attachment pipe. Furthermore, a house yard is arranged in the hole, and the end of the vinyl chloride pipe 66 is connected to the house yard.

When the relay shaft is to be recovered to the open groove side, the cutter front portion 86 of the tip cutter device 82 is removed.
It is also possible to attach a cleaning buff or the like in the vinyl chloride pipe and perform cleaning with a buff or the like. If the PVC pipe being propelled bends during the excavation and the excavation direction needs to be corrected, the excavation direction is corrected as follows.

In the rotation direction of the cutter device 82, when it is desired to bend in the direction to be bent, for example, in a vertically upward direction, the front and rear sides (both right and left) including the vertically upward direction are drilled in the same manner as described above. When excavating before and after including the vertical lower part on the opposite side, the slide jack 7
6, the cutter device 82 is retracted as shown in FIG. 2, the cutter rear portion 88 is brought into contact with the tip guide ring 126, and the movable cutter bit 98 is tilted forward to reduce the drilling diameter. When excavating the middle of these, the protrusion amount of the cutter device 82 is adjusted according to the situation, and the angle of the movable cutter bit 98 is appropriately adjusted. As a result, the upper excavation diameter becomes larger than the lower excavation diameter, and the resistance from the ground acting on the vinyl chloride pipe 66 becomes smaller at the upper side than at the lower side, so that the excavation direction is gradually bent. When the cutter device 82 drawn into the PVC pipe 66 is pushed out of the PVC pipe 66, the movable cutter bit 98 is caused by the reaction force when excavating the ground and the slide sleeve 100, and automatically moves to the state shown in FIG. Can be restored. At this time, the spring 10
If the movable cutter bit 98 cannot be returned by the spring force of 2, the compressed air or pressurized water can be supplied to the cutter device 82 to apply a larger force to the slide sleeve 100 to cause the movable cutter bit 98 to be caused. .

When the cutter device 82 is stuck due to the soil quality of the ground to be excavated, the slide jack 7 may be used.
By moving the cutter device 82 in the front-rear direction at an arbitrary cycle according to 6, the stacking of the cutter device 82 can be prevented, and smooth drilling can be performed. In addition, depending on the soil properties, high-pressure water or compressed air can be injected from the discharge holes 112 provided in the front cutter 86 to facilitate excavation.

As described above, the underground pipe laying using the embodiment can promote the soft pipe in parallel with the drilling, and can greatly improve the efficiency of the work of laying the vinyl chloride pipe. It is possible to shorten the period of the laying work, reduce the cost, and eliminate complaints (noise, vibration, traffic obstacles, ground deformation, etc.) of the residents regarding the construction pollution. Moreover, the excavating device main body 30 is arranged in a narrow excavation groove in which the sewer main pipe 12 is buried, and the relay discharging shaft 116 and the vinyl chloride pipe 138 are sequentially added to excavate underground so that the outside of a fence or the like is removed. Even if there is a structure, it will not hinder the laying of underground sewer pipes. In addition, recovery work such as backfilling is not required, so that the construction period can be shortened and the construction cost can be reduced.

Since excavation is not required to lay the sewage branch pipe underground, the influence on local residents can be reduced, and complaints and the like can be reduced.
Further, in the embodiment, the propulsion device main body 30 is
By detachment of 4, the upper body including the propulsion jack 50 and the lower body including the slide rail 42 can be easily disassembled and assembled, so that they can be transported by human power and can be easily brought into the site. . In the embodiment,
Attach the slide rail 42 to the swivel table 34,
The propulsion device main body 30 can be easily installed in a target excavation direction because it can be turned in a horizontal plane and the amount of the turning angle can be read from the scale 38 on the base 32. Furthermore, in the embodiment, since the guide ring 126 is attached to the tip of the vinyl chloride pipe 66 to prevent the cutter device 30 from oscillating, stable drilling can be performed, and occurrence of bending and the like can be suppressed. it can.

In the above embodiment, the underground propulsion installation work of the sewage branch pipe made of the vinyl chloride pipe has been described, but the underground installation of the water supply pipe, the gas pipe, the electricity, the telephone, and the like, and the underground installation of the steel pipe and the like are described. Can also be applied. In the above embodiment, the case where the sewer branch pipe is laid underground when the sewer main pipe 12 is buried has been described.
Even after the completion of the embedding of 2, the small pipe is excavated at the connection between the branch pipe and the main pipe, and the propulsion device main body 30 is arranged and fixed. Can be laid underground. In the above-described embodiment, the case where the propulsion device body 30 can be divided into two parts, that is, the upper part of the propulsion jack 50 and the lower part of the slide rail 42, has been described. Can be freely disassembled and assembled to facilitate transportation and storage.

FIG. 11 shows a main part of another embodiment. In this embodiment, the propulsion device body 3
An end face cam 190 is provided on the back surface of the 0 main push spreader 56. The cam 190 has a convex portion 192 and a concave portion 194, and is formed in a ring shape having a hole at the center portion through which a rotary output shaft 80 driven to rotate by a drive motor 74 passes. Then, the cam 190
Is fixed to the original push spreader 56 by a bolt or the like at the attachment portion 196, and is attached at the attachment position, that is,
The position of the convex portion 192 with respect to the axis can be arbitrarily changed.

On the other hand, a cam roller mounting plate 198 is fixed to the rotary output shaft 80. A cam 190 is provided on the front surface of the cam roller mounting plate 198 facing the cam 190.
A roller 200 that rolls on the end face of the lens is rotatably mounted. A cam 1 is located near the tip of the rotary output shaft 80.
A thread is formed to connect the 90 and the main push spreader 56 to the tip cutter device 82 or the joint 114 of the relay earth discharging shafts 84 and 116. The roller mounting plate 198 is mounted on the rotary output shaft 80 with bolts or the like.

In the present embodiment configured as described above, the cam roller 20 mounted on the roller mounting plate 198
When 0 rolls on the convex portion 192 of the cam 190 as shown in FIG. 12, the cutter device 82 is drawn into the vinyl chloride pipe 66, and the movable cutter bit 98 falls forward to reduce the excavation diameter. Therefore, the excavation direction can be bent to the side where the convex portion 192 of the cam 190 is arranged. Further, when the cam roller 200 rolls in the concave portion 194 of the cam 190, the cutter device 82 is pushed out so that the digging diameter becomes an initial setting. Further, the cam recess 19
4, when the cam roller 200 rolls, it is possible to excavate larger than the set excavation outer diameter.

FIG. 13 shows another cam mechanism. In this embodiment, a cylindrical cam 202 is detachably attached to the back of the original push spreader 56. A cam roller 204 mounted on a roller mounting plate 198 provided on the rotary output shaft 80 rolls on a cam groove 206 formed on the peripheral surface of the cylindrical cam 202.

FIG. 14 shows another embodiment. In this embodiment, as shown in FIG. 1A, a protective tube 210 is disposed inside a vinyl chloride pipe 66. The protective cylinder 210 is made of an elastic member such as a metal or a plastic, and has a slit 21 along an axis as shown in FIG.
2 are provided. And the protection cylinder 210 is provided with the slit 2
By reducing the width of 12, it can be easily inserted into the vinyl chloride pipe 66 and can be brought into close contact with its inner surface. The protective tube 210 is also arranged inside a vinyl chloride tube 138 that is sequentially added. It is desirable that the end of the protective tube 210 and the edge of the slit 212 be chamfered so as not to damage the vinyl chloride tube.

In the present embodiment configured as described above, the inner surfaces of the vinyl chloride pipes 66 and 138 are formed by the discharging blades 120 and excavated earth and sand which are transported backward by the discharging blades 120 and continuously discharged. Can be prevented from being scratched. When the end of the vinyl chloride pipe 66 reaches the reaching shaft, after removing the cutter front portion 86 of the cutter device 82 and the guide ring 126, a ring, a disk, and the like for collecting the protection cylinder 210 are removed. Cutter rear 8
8 and the protective cylinder 210 is recovered by pulling out the relay discharge shaft 84 to the starting shaft side as described above.

It should be noted that the discharging blade 120 is provided only on the relay discharging shaft 84 having the tip cutter device 82, and the relay discharging shaft 116 to be added sequentially is connected to the discharging blade 120 as shown in FIG. The excavated earth and sand excavated by the cutter device 82 is excavated to the reaching shaft while being held in the vinyl chloride pipes 66 and 138, and then the cutter front portion 86 of the cutter device 82 is removed to remove the soil. When the relay shafts 116 and 84 are collected in the starting shaft, the excavated earth and sand in the vinyl chloride pipes 138 and 66 may be discharged into the starting shaft.
Thus, the earth discharging operation can be easily performed.

[0048]

As described above, according to the underground pipe laying method of the present invention, the guide device for protecting the tip of the pipe is mounted on the tip of the pipe laid in the ground to mount the cutter device. Supporting forward and reverse rotation, while drilling the ground by the cutter device, simultaneously drilling and propulsion of the underground pipe by simultaneously propelling the cutter device and the underground pipe, The efficiency of underground installation work of pipes such as PVC pipes can be greatly improved, shortening the construction period and reducing costs,
Work environment can be improved.

Further, the cutter device is excavated while being moved in the front-rear direction at an arbitrary cycle in accordance with the soil characteristics of the ground to be excavated, so that the cutter device can be prevented from being stuck and smooth cutting. Holes are possible. In addition, after digging up to the destination pit while holding the soil excavated by the cutter device in the pipe, by recovering the cutter device to the starting pit, by discharging the excavated soil held in the pipe into the starting pit, Simplification of the unloading work can be achieved. Furthermore, after arranging a protective cylinder that can be inserted and removed to protect the inner surface of the pipe inside the pipe, a discharging mechanism is provided at the rear of the cutter device, and after digging to the destination pit while continuously discharging the starting pit side, When the cutter device is collected in the starting pit, the protection tube arranged in the pipe is moved to the starting pit side for collection, so that continuous discharge can be performed without damaging the inner surface of the pipe.

Further, according to the underground excavation device of the present invention,
In addition to providing a cam mechanism for moving the cutter device in the front-rear direction at a predetermined cycle, a movable cutter bit is provided in the cutter device, and when the cutter device is retracted inside the pipe, the movable cutter bit contacts the guide ring and moves forward. By adopting the falling mechanism, the excavation diameter can be made smaller than the set diameter, and the excavation direction and the propulsion alignment of the propulsion pipe can be easily corrected. In addition, by providing a movable support base and fixing the tube coaxially with the rotary output shaft, the propulsion force is accurately transmitted in the excavation direction while preventing deflection of the propulsion tube, and bending at the time of connection of the tube can be prevented. .

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a tip cutter device of an underground excavation device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of the cutter device according to the embodiment.

FIG. 3 is a side view of a main body of the underground excavation device according to the embodiment.

FIG. 4 is a plan view of a main body of the underground excavation device according to the embodiment.

FIG. 5 is a partially enlarged plan view of the underground excavation device according to the embodiment.

FIG. 6 is a sectional view of a relay earth discharging shaft of the cutter device according to the embodiment.

FIG. 7 is a sectional view of a vinyl chloride pipe to be added according to the embodiment and a sectional view of a relay discharging shaft to be added.

FIG. 8 is a cross-sectional view of a speed reducer according to the embodiment.

FIG. 9 is a diagram illustrating a flow path of hydraulic oil of the propulsion jack according to the embodiment.

FIG. 10 is a partial cross-sectional view of a lower jack of the propulsion jack according to the embodiment.

FIG. 11 is a sectional view of a cam mechanism according to the embodiment.

FIG. 12 is a diagram illustrating the operation of the cam mechanism according to the embodiment.

FIG. 13 is a sectional view of another cam mechanism according to the embodiment.

FIG. 14 is a cross-sectional view of another embodiment and an explanatory view of a protective cylinder.

FIG. 15 is a diagram illustrating a conventional method of laying a sewer branch pipe.

[Explanation of symbols]

12 Sewer main pipe 30 Excavation device main body 32 Swivel table 42, 50, 55, 56 Propulsion mechanism (slide rail, propulsion jack, main slider, main push spreader) 66, 138 Vinyl chloride pipe 68 Press ring 70, 76 Slide mechanism (sub) (Slider, slide jack) 74 Drive motor 80 Rotary output shaft 82 Cutter device 98 Movable cutter bit 84, 116 Relay earth discharging shaft 190 End face cam 200, 204 Cam roller 210 Protective cylinder 202 Cylindrical cam

Claims (8)

[Claims] 1. A guide ring for protecting a pipe is mounted on the tip of a pipe for propelling underground to support a cutter apparatus so that the cutter apparatus can be rotated forward and backward. An underground pipe laying method by a small-diameter propulsion method, wherein the underground pipe is excavated by transmitting power to the apparatus, and the cutter apparatus and the pipe are simultaneously excavated. 2. The underground pipe laying method according to claim 1, wherein the cutter device is excavated while being moved in an anteroposterior direction at an arbitrary cycle in accordance with the soil quality of the ground to be excavated. . 3. The excavated earth and sand retained in the pipe is discharged into the starting pit when the cutter apparatus digs up to the destination pit while holding the excavated earth and sand in the pipe while holding the excavated soil in the pipe. The underground pipe laying method according to claim 1 or 2, wherein the underground pipe is laid by a small-diameter propulsion method. 4. A detachable protection cylinder for protecting the inner surface of the pipe is disposed inside the pipe, and an earth discharging mechanism is provided at a rear part of the cutter device to continuously discharge the earth to the starting pit side while reaching the arrival pit. The small-diameter propulsion method according to claim 1 or 2, wherein when the cutter device is recovered in the starting pit, the protection cylinder disposed in the pipe is moved to the starting pit side and collected. Underground pipe laying method. 5. A cutter device rotatably and forwardly supported by a guide ring for protecting a pipe mounted on the tip of a pipe for propelling underground, and a pipe and the cutter apparatus provided in a starting pit. A propulsion mechanism that can be simultaneously propelled, a slide mechanism that is provided so as to be relatively movable with respect to the propulsion mechanism, and that is capable of moving the cutter device in the front-rear direction at an arbitrary cycle; and a slide mechanism that is provided on the slide mechanism. And a drive source having a rotation output shaft for applying a rotational force to excavate the ground. 6. The cutter device has a movable cutter bit that can be raised and lowered, and the slide mechanism has a cam mechanism that can be attached to an arbitrary rotation position. The cam mechanism moves the cutter device back and forth at a predetermined cycle. When the cutter device is retracted, the movable cutter bit is brought into contact with the guide ring to fall down, and the diameter of the ground excavation by the cutter device is reduced so that the direction of the guide ring can be corrected and the propulsion line of the pipe to be propelled can be corrected. The underground excavation device according to claim 5, wherein: 7. The propulsion mechanism has a long-stroke mechanism capable of extending and contracting in a plurality of stages on each of a front side and a rear side of a main body, and performs a predetermined propulsion length of the pipe in one stroke of the long-stroke mechanism. The underground excavation device according to claim 5, wherein the underground excavation device can be used. 8. The propulsion mechanism has a main push spreader for propelling the pipe, and a movable support base capable of fixing the pipe coaxially with the rotary output shaft is provided in front of the main push spreader, While simultaneously moving the movable support while maintaining a constant interval at a position where the main push spreader has propelled forward by a fixed amount, along with the return of the main push spreader unit to the initial position, the movable support is moved to the initial position. The underground excavation device according to any one of claims 5 to 7, further comprising a return mechanism for returning at the same time.