JP2011052528A - Method for installing pipe into ground, and drilling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for installing pipes into the ground and a drilling device, which drives smoothly a pipe in the ground, even when the ground is mixed with a rigid gravel. <P>SOLUTION: This pipe installation method is constituted to install a drilling machine 26, inside a head opening side of the pipe 2 driven into the ground in advance, when the pipe 2 of rectangular cross-sectional shape is installed in the ground 10 from a cavity 100 formed in the ground 10, and to drive the pipe 2 to be installed in the ground, by pressing the pipe 2 and by drilling the ground 10 by the drilling machine, and uses the drilling machine 26 having a rotary drilling body 46 rotated around the rotation center line crossed with the driving direction of the pipe 2 as the rotation center, as the drilling machine 26. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a pipe installation method and excavation apparatus for installing a pipe having a rectangular cross section in the ground.

Conventionally, a method of installing a tube having a rectangular cross section in the ground is known.
For example, a curved pipe with a rectangular cross-section that extends by bending to draw an arc (a pipe whose central axis is a curve), or a pipe with a rectangular cross-section that extends straight (a pipe whose central axis is a straight line) ) In the ground, install an injection device that injects high-pressure water inside the top opening side of the pipe that goes into the ground first, or rotate the bit around the center axis of the pipe Install an excavating machine with a rotating excavator that excavates underground, install an injection device for excavating soil near the corner inside the pipe that is not excavated by the rotary excavator, and press the pipe A method is known in which a pipe is propelled by excavating the ground with high-pressure water or by excavating the ground with a drilling machine and high-pressure water (see, for example, Patent Document 1). .

JP 2005-83007 A

However, there is a problem in that the underground cannot be excavated by high-pressure water when the underground is hard and mixed with ground.
Moreover, when using the excavating machine mentioned above, it is possible to excavate even if the underground is hard and mixed with ground. However, since the rotation center line of the rotary excavator of the excavating machine and the propulsion direction of the pipe are the same, it is only possible to form a cylindrical cavity extending in the propulsion direction by excavating the rotary excavator, The cylindrical cavity that can be formed by excavation of the rotary excavator does not match the cross-sectional shape of the tube with a rectangular cross section. There was a drawback that the underground part of the tube could not be excavated and the tube could not be pushed smoothly in the ground.
The present invention has been made in view of the above problems, and even when the underground is hard and mixed with underground, the tube can be installed smoothly in the underground so that the tube can be smoothly promoted in the underground. And a drilling rig.

In the underground pipe installation method according to the present invention, when a pipe having a rectangular cross section is installed in the ground from a hollow portion formed in the ground, the inside of the top opening side of the pipe that is first put into the ground In the method of installing pipes in the ground, where the excavating machine is installed in the ground by pushing the pipe and excavating the underground with the excavating machine, the pipe is installed in the ground. Since the excavating machine has a rotating excavator that rotates around the rotation center line that intersects with the center of rotation, the inside corner of the tube with a rectangular cross section can be used even when the underground is in a mixed ground Since the underground part near the section can be excavated by the rotary excavator, the pipe can be smoothly promoted in the underground.
In the underground pipe installation method according to the present invention, a pipe having a rectangular cross section is continuously straddled between one cavity and the other cavity formed in the ground, or When constructing a support work by installing it in the ground so that it will return to the cavity part starting from the cavity part formed in the excavation machine, the excavating machine is installed inside the top opening side of the pipe to be put in the ground first In the underground pipe installation method of pushing the pipe and excavating the underground with an excavating machine to install the pipe in the ground, as the excavating machine, the rotation center that intersects the propulsion direction of the pipe Because the excavating machine has a rotating excavator that rotates around the line, the underground part near the corner inside the rectangular tube is rotated even when the underground is hard and mixed. Since it will be possible to excavate with a drilling body, the pipe should be smoothly driven in the ground. Can, it is possible to easily construct a 支保 Engineering across successively between one cavity and the other cavity.
As the pipe, a curved pipe having a rectangular cross section that is bent and extended so as to draw an arc is used, so that the curved pipe can be smoothly promoted in the ground.
The leading pipe is pushed by pushing the leading pipe as the pipe that goes into the ground first, and excavating the underground with a drilling machine, and the trailing pipe is sequentially connected to the rear end of the leading pipe to promote the leading pipe. Since a plurality of pipes were installed in the ground, it is possible to easily construct a support work having a long length in the direction along the central axis by using a pipe having a short length in the direction along the central axis. Become.
As the rotary excavator, a rotary excavator that rotates around the rotation center line that is orthogonal to the propulsion direction of the pipe that enters the ground first is used as the rotation center. It is possible to increase the size of the pipe and to easily install a rectangular pipe according to the excavation width.
Since the tip of the excavating blade provided on the rotary excavator is located behind the tip of the guide blade tube installed at the tip of the tube that goes into the ground first, the guide blade stuck into the ground Only the underground part that enters the inside of the cutting edge of the pipe is excavated by the excavating blade, and the underground excavation part is reduced, so that the influence on the underground such as ground subsidence can be reduced.
Since a plurality of pipes are installed in the ground so that the outer surfaces adjacent to each other are in contact with each other, the contact area between the adjacent pipes is increased, and groundwater from outside the region is within the area surrounded by the adjacent pipes. It becomes easy to block the entry, and the ground subsidence outside the area can be prevented.
The excavator according to the present invention is installed on the inner side of the front opening side of a tube having a rectangular cross section that is first inserted into the ground from a hollow portion formed in the ground, and the propulsion direction of the tube Since it has a rotating excavator that rotates around the intersecting rotation center line, the underground part near the corner inside the rectangular section of the pipe is rotated and excavated even if the underground is hard and mixed Since it can be excavated by the body, the pipe can be smoothly promoted in the ground.

The figure which shows the installation method of the pipe | tube in the ground (Embodiment 1). Sectional drawing of a pipe | tube installation apparatus (Embodiment 1). The disassembled perspective view which decomposed | disassembled and showed the front tube and the guide blade tube (Embodiment 1). The figure which looked at the excavation machine inside a pipe | tube from the blade edge | tip side of a guide blade pipe | tube (embodiment 1). The perspective view which shows the shape and installation form of a curved pipe (Embodiment 1). Sectional drawing of the support construction constructed | assembled by the curved pipe (Embodiment 1). Sectional drawing which shows the example of the support construction constructed | assembled by the pipe installation method which installs a curved pipe (Embodiment 1). Sectional drawing which shows the example of the support construction constructed | assembled by the pipe installation method which installs the pipe | tube extended straightly (Embodiment 1). The perspective view which shows the example of the support construction constructed | assembled by the pipe installation method which installs the pipe | tube extended straightly (Embodiment 1). Sectional drawing of a pipe installation apparatus (embodiment 2). The disassembled perspective view which decomposed | disassembled and showed the front tube and the guide blade tube (Embodiment 2). The figure which looked at the excavation machine inside a pipe | tube from the blade edge | tip side of a guide blade pipe | tube (Embodiment 2).

Embodiment 1
As shown in FIG. 2, the pipe installation apparatus 1 for realizing the underground pipe installation method according to the first embodiment includes a plurality of pipes 2, an excavation apparatus 3, a propulsion apparatus 4, and a propulsion force transmission plate 5. With. In the following, the upper side in FIG. 2 is defined as the head or front side of the tube 2 or the tube installation device 1, the lower side in FIG. 2 is defined as the rear side of the tube 2 or the tube installation device 1, and the left and right sides in FIG. It is defined as the left and right sides of the tube 2 and the tube installation device 1, and the upper and lower sides in the direction orthogonal to the paper surface of FIG. In FIG. 3, the front side, the rear side, the left side, the right side, the upper side, and the lower side of the pipe 2 and the pipe installation device 1 are clearly shown.

The pipe 2 is a curved pipe (a pipe whose central axis is a curve) formed so as to bend and extend so as to draw an arc as shown in FIGS. 5 to 7, or FIG. 8; FIG. As shown, the tube extends straight (a tube having a straight central axis (hereinafter referred to as a straight tube)), and the cross-sectional shape when the tube is cut along a plane perpendicular to the central axis of the tube is rectangular. It is formed by a shaped tube. As the pipe 2, for example, a steel pipe is used.
Then, as shown in FIG. 7, a plurality of curved pipes are sequentially connected and installed in the underground 10 so that a support work 11 that bends and extends so as to draw an arc is constructed in the underground 10 or FIG. As shown in FIG. 9, a support work 11 is constructed in the underground 10 that is straightly extended by connecting a plurality of straight pipes sequentially and being installed in the underground 10.
As shown in FIG. 7 to FIG. 9, the support 11 constructed in the ground by the pipe installation device 1 and the pipe installation method of the first embodiment is followed by the pipe 2 positioned at the head (hereinafter referred to as the head pipe). And a plurality of tubes 2 (hereinafter referred to as subsequent tubes).
For example, as shown in FIG. 5; FIG. 6, it is formed by a leading pipe 6 which is a curved pipe positioned at the head and a succeeding pipe 7 which is a plurality of succeeding curved pipes provided so as to follow the leading pipe 6. The support works 11 constructed by the continuous curved pipes 67 are provided adjacent to each other. That is, the support work 11 is constructed in the underground 10 by repeatedly moving the leading pipe 6 in the direction of arrow F and sequentially connecting the succeeding pipe 7 after the leading pipe 6.
As shown in FIG. 7 (a), as the support work 11, a plurality of pipes 2 are formed so as to straddle between one tunnel cavity 100 formed in the ground 10 and the other tunnel cavity 100. As shown in FIG. 7 (b), a plurality of pipes start from the cavity 100 formed in the ground 10 and return to the cavity 100. As shown in FIG. 8, a plurality of pipes 2 are formed so as to straddle between one tunnel cavity 100 and the other tunnel cavity 100, as shown in FIG. As shown in FIG. 9, a plurality of straight pipes as pipes 2 extending so as to extend in the tunnel extending direction at the portion where the tunnel is dug as shown in FIG. Support construction 11 that is built and constructed continuously A.

As shown in FIG. 2; FIG. 3; FIG. 4, a guide blade tube 9 is provided at the tip of the leading tube 6. The guide blade tube 9 is a tube including a blade portion 14 in which one open end edge 13 of the tube is formed sharply. The other opening end of the guide blade tube 9 and the opening end 8 at the tip of the leading tube 6 are connected.
In this case, for example, the outer diameter of the guide blade tube 9 is larger than the outer diameter of the leading tube 6, and the inner end of the tube at the open end surface 15 is located on the other open end surface 15 side of the guide blade tube 9. It is set as the structure by which the fitting hole 16 which engages with the opening edge part 8 of the front-end | tip of the front pipe | tube 6 was formed by shaving the surrounding surface side and providing a level | step difference. Then, the opening end 8 at the front end of the leading tube 6 is fitted into the fitting hole 16 provided in the other opening 17 of the guide blade tube 9, and both of these are not shown in the figure such as bolt joining and welding. It is set as the structure by which the other opening edge part of the guide blade pipe | tube 9 and the opening edge part 8 of the front-end | tip of the front pipe | tube 6 were connected by connecting by a connection means. In this way, the opening end 8 of the leading end of the leading tube 6 is fitted into the fitting hole 16 provided in the other opening 17 of the guiding blade tube 9 so that the guiding blade tube 9 is open to the leading end of the leading tube 6. By adopting a structure that is attached so as to cover the edge surface 18, the propulsion resistance can be reduced because the tip opening edge surface 18 of the leading pipe 6 does not receive the resistance of the ground 10 when propelling the leading pipe 6. Further, since the fitting hole 16 into which the opening end portion 8 at the tip of the leading tube 6 is fitted is formed, the guide blade tube 9 can be easily installed at the leading end of the leading tube 6. Assembly with the blade tube 9 can be facilitated.

  On the inner surface 20 of the pipe of the leading pipe 6, a pipe-side propulsive force receiving portion 21 is provided at a position on the leading side with respect to the central portion in the tube extending direction (the direction along the central axis of the pipe). The tube side propulsive force receiving portion 21 receives the propulsive force from the propulsion device 4 via a substrate provided in the excavating device 3 to be described later and propels the top tube 6. The tube-side propulsive force receiving portion 21 has a rectangular frame outer periphery dimension corresponding to a rectangular shape that makes a round around the inner surface of the cross section of the front tube 6 (a cross section when the front tube is cut along a plane orthogonal to the central axis of the tube of the front tube). The rectangular frame 22 is formed in a state in which the outer peripheral surface 23 of the rectangular frame 22 and the inner peripheral surface 20a of the tube of the leading tube 6 are arranged to correspond to each other. It is fixed to the inner peripheral surface 20a of the tube by welding, bolting or the like.

The excavation apparatus 3 includes a substrate 25, an excavation machine 26, a drive source 27, a soil discharge pipe 28, and a propulsive force transmission pipe 29.
The substrate 25 is formed by a rectangular plate 30 corresponding to a rectangular shape that goes around the inner surface of the cross section of the top tube 6. The size of the rectangular plate 30 is smaller than the rectangular dimension that goes around the inner surface of the cross section of the leading pipe 6 and is larger than the rectangular inner peripheral dimension of the rectangular frame 22 that forms the tube-side propulsive force receiving portion 21. Is also big. That is, the rectangular peripheral surface 33 on the front surface 39 f of the rectangular plate 30 that forms the substrate 25 is formed so as to be able to contact the frame rear surface 32 of the rectangular frame 22 that forms the tube-side propulsive force receiving portion 21. In addition, between the rectangular peripheral surface 33 in the front surface 39f of the rectangular plate 30 which forms the board | substrate 25, and the frame rear surface 32 of the rectangular frame 22 which forms the tube side thrust receiving part 21, the watertight formed by the elastic body, for example Maintenance material 35 (packing) is provided. The watertightness maintaining member 35 is, for example, a rectangular frame attached to the rectangular peripheral surface 33 on the front surface 39f of the rectangular plate 30 forming the substrate 25 or the frame rear surface 32 of the rectangular frame 22 forming the tube side propulsive force receiving portion 21. Formed by body 36.
One end of a support body of an excavating machine 26 to be described later is fixed to the central portion of the front surface 39f of the substrate 25.
The substrate 25 includes a soil removal hole 38 and a pressure-resistant hose lead-out hole 38a penetrating the front surface 39f and the rear surface 39. A soil discharge pipe 28 is connected to the rear surface 39 of the substrate 25 so as to communicate with the soil discharge hole 38. A propulsive force transmission tube 29 is connected to the center of the rear surface 39 of the substrate 25.

The excavating machine 26 includes a support unit 40 and a rotating unit 41.
The support portion 40 is formed by one column 42 and two branch columns 43. For example, a mounting flange (not shown) is provided at one end of the column 42, and the mounting flange is detachably fixed to the center of the front surface 39f of the substrate 25 by a fixing tool such as a bolt and a nut. One end is fixed to the center of the front surface 39f of the substrate 25, and the support column 42 extends in a direction orthogonal to the front surface 39f of the substrate 25. The two branch columns 43 extend in a direction away from each other on a straight line perpendicular to the extending direction of the columns 42 from the distal end portion of the column 42. A motor mount 44 is provided at each end of the branch column 43.

The rotating unit 41 includes a rotating mechanism unit 45 and a rotating excavator 46.
The rotation mechanism unit 45 is configured by a motor 47, for example. A casing 48 of a motor 47 is fixed to each motor mount 44;
The rotating shafts 49; 49 of the two motors 47; 47 extend in a direction away from each other on a straight line perpendicular to the extending direction of the support column from the tip end portion of the support column 42.
The rotary excavator 46 includes a housing 50 that is closed at one end and the other end, and a plurality of excavation bits 52 (excavation blades) provided on the outer peripheral surface 51 of the housing 50.

For example, the other end closed inner surface 53 of the housing 50 and the motor are arranged such that the center of the other end closed inner surface 53 (inner bottom surface of the housing) of the rotary excavator 46 coincides with the rotation center of the rotary shaft 49. A connecting plate 54 provided at the tip of a rotating shaft 49 rotated by 47 is connected by a connecting tool 57 such as a screw.
In other words, the two rotary excavating bodies 46 are configured to rotate around a single rotation center line L common to the two rotation shafts 49 and 49. That is, the two rotary excavating bodies 46 and 46 that rotate about the rotation center line L orthogonal to the propulsion direction of the leading pipe 6 are provided. Such a configuration including two rotary excavating bodies 46; 46 is called a twin header. When a so-called twin header provided with two rotary excavating bodies 46; 46 rotating around the rotation center line L orthogonal to the propulsion direction of the leading pipe 6 is used, the rotary excavating body 46 in a plane orthogonal to the propulsion direction is used. Therefore, it becomes possible to easily install the pipe 2 having a rectangular width corresponding to the excavation width in the underground 10.

In addition, what is necessary is just to adjust suitably the front-back position of the rotary excavation body 46; 46 by changing the installation position of the pipe side thrust receiving part 21 back and forth.
For example, by making the tip 80 of the excavation bit 52 to be located rearward of the cutting edge 81 of the guide blade tube 9, the underground portion that has entered the inside of the cutting edge of the guide blade tube 9 pierced into the ground 10 Since only the excavation bit 52 excavates, the number of underground excavation portions is reduced, and the influence on the underground such as ground subsidence can be reduced.

  As the motor 47, a motor that operates by fluid pressure or a motor that operates by electricity is used. For example, when a hydraulic motor (hereinafter referred to as a hydraulic motor 47) is used, the pressure source hose in which the hydraulic source 55 as the drive source 27 and the casing 48 of the hydraulic motor 47 form a pressure oil supply path 56a and an oil return path 56b. Connected at 56. The hydraulic motor 47 is configured such that the rotary shaft 49 is rotated by pressure oil supplied into the casing 48.

  The propulsive force transmission plate 5 is detachably attached to the rear end portion of the front pipe 6 by a connecting tool 58 such as a bolt so as to close the rear end opening 8a of the front pipe 6 and to contact the rear end surface 8b of the front pipe 6. Connected. The propulsion force transmission plate 5 is formed with a drainage pipe through-hole 60 and a pressure-resistant hose lead-out hole 61 penetrating the front surface 59 and the rear surface 67.

The propulsive force transmission tube 29 connected to the rear surface 39 of the substrate 25 is, for example, a rectangular frame 22 in which the rectangular peripheral surface 33 on the front surface 39f of the rectangular plate 30 forming the substrate 25 forms the tube-side propulsive force receiving portion 21. The shortest distance X between the rear surface 39 of the substrate 25 in a state of being pressed against the rear surface 32 of the frame via the watertightness maintaining member 35 and the front surface 59 of the propulsive force transmission plate 5 connected to the rear end portion of the leading pipe 6. Corresponding length of steel pipe is used.
For example, the earth removal pipe 28 having a length longer than the shortest distance X and having a rear end penetrating the earth removal pipe through hole 60 of the propulsive force transmission plate 5 is used.

  The propulsion device 4 is configured by a hydraulic jack 62, for example. A pressing plate 64 is provided at the tip of the piston rod 63 of the hydraulic jack 62. Watertightness may be improved by providing a box body outside the figure at the rear part of the rectangular plate 30 and attaching a packing to the side surface of the box body outside the figure.

Next, with reference to FIG. 1, the installation method of the pipe | tube 2 to the underground 10 by the pipe installation apparatus 1 is demonstrated.
The excavation apparatus 3 provided with the excavating machine 26, the earth removal pipe 28 and the propulsion force transmission pipe 29 on the substrate 25 is installed inside the top pipe 6. That is, the rectangular peripheral surface 33 on the front surface 39 f of the rectangular plate 30 that forms the substrate 25 is connected to the water-tightness maintaining material 35 on the frame rear surface 32 of the rectangular frame 22 that forms the tube-side propulsive force receiving portion 21 inside the top tube 6. It is installed so that it is in a state of being pushed through. As a result, when the pipe 2 is installed in the underground 10 from the hollow portion 100 formed in the underground 10, the excavating machine 26 is installed inside the leading opening side of the leading pipe 6 that is first inserted into the underground 10. The
Then, the pressure oil supply path 56a having one end connected so as to communicate with the inside of the casing 48 of the hydraulic motor 47 and the oil return are passed through the rear end of the discharge pipe 28 through the discharge pipe through hole 60 of the propulsive force transmission plate 5. The other end of the pressure hose 56 forming the path 56b is passed through the pressure hose lead-out hole 61 of the propulsive force transmission plate 5 and pulled behind the propulsive force transmission plate 5, and then propelled to the rear end portion 102 of the leading pipe 6. The force transmission plate 5 is connected. Then, the other end of the pressure hose 56 is connected to the hydraulic pressure source 55.
The hydraulic jack 62 is installed in a state where the cutting edge 81 of the guide blade tube 9 at the tip of the leading tube 6 is pressed against the ground surface 101, and the thrust plate 64 provided at the tip of the retracted piston rod 63 is used as the propulsive force transmission plate 5. Is located at the center of the rear surface 67.
Under the control of the control device 65, while supplying the pressure oil from the hydraulic power source 55 to the hydraulic motor 47 to rotate the rotary excavator 46, the piston rod 63 of the hydraulic jack 62 is extended and the pressing plate 64 is used to push the propulsive force transmission plate 5. The center of the rear surface 67 is pressed.
As a result, the leading pipe 6 is propelled forward by the propulsive force transmitted to the leading pipe 6 via the propulsive force transmitting plate 5 and the rear end face 8b of the leading pipe 6, and the propelling force transmitting plate 5 and the thrust transmitting pipe 29, the guide blade pipe 9 and the leading pipe 6 are propelled forward by the propulsive force transmitted to the leading pipe 6 and the rotary excavating body 46; 46 propels forward.
The propulsive force transmission plate 5 and the rear end surface 8b of the leading pipe 6 constitute a first propulsive force transmitting portion that transmits the propulsive force from the rear end surface 8b of the leading pipe 6 to the leading pipe 6. The propulsive force transmitting plate 5 and the propulsive force The transmission tube 29, the substrate 25, and the tube-side propulsive force receiving portion 21 constitute a second propulsive force transmitting portion that transmits the propulsive force from the inner peripheral surface 20a of the tube 2 to the leading tube 6. First propulsive force transmission such as using a propulsive force transmission plate 5 having a size that does not contact the rear end surface 8b of the leading pipe 6 so that the propulsive force is not transmitted to the leading pipe 6 via the rear end surface 8b of the leading pipe 6. The leading pipe 6 may be pressed only by the propulsive force transmission portion of either the portion or the second propulsive force transmission portion.
As a result, the rotary excavator 46; 46 excavates the underground 10 and the excavated earth and sand are sucked by the suction device (vacuum device) connected to the rear end of the soil discharge pipe 28. Is excavated through.
In this case, even if the underground 10 is hard and mixed, it becomes possible to excavate the underground 10 portion near the corner inside the tube 2 having a rectangular cross section with the two rotary excavators 46; The leading pipe 6 can be smoothly promoted in the underground 10.

After the front pipe 6 is installed in the ground 10 leaving the rear end portion 102 of the front pipe 6, the propulsive force transmission plate 5 is removed, and the extended soil discharge pipe 28 a is connected to the rear end of the soil discharge pipe 28, and The extension propulsion force transmission tube 29 a is connected to the rear end of the propulsion force transmission tube 29, and the extension pressure hose 56 d is connected to the other end of the pressure hose 56.
Then, the subsequent pipe 7 is connected to the rear end of the leading pipe 6 by welding or a fixture such as a bolt. The rear end of the extended earth discharge pipe 28a is passed through the earth discharge pipe through hole 60 of the propulsive force transmission plate 5 and the other end of the extended pressure hose 56d is passed through the pressure hose lead-out hole 61 of the propulsive force transmission plate 5 to provide the propulsive force transmission plate 5. Then, the thrust transmission plate 5 is connected to the rear end portion of the succeeding tube 7. Then, the other end of the extended pressure hose 56 d is connected to the hydraulic pressure source 55.
Thereafter, in the same manner as described above, the hydraulic jack 62 is installed, the pressing plate 64 provided at the tip of the retracted piston rod 63 is positioned at the center of the rear surface 67 of the propulsive force transmission plate 5, and then the rotary excavator 46; While rotating 46, the piston rod 63 of the hydraulic jack 62 is extended and the center of the rear surface 67 of the propulsive force transmission plate 5 is pressed by the pressing plate 64. As a result, the leading pipe 6 and the leading pipe 6 are propelled forward and the rotary excavator 46; 46 is rotated while propelling forward to excavate the ground, so that the succeeding pipe connected to the rear end of the leading pipe 6 7 is installed in the ground 10. Thereafter, the support pipe 11 as shown in FIG. 7 can be constructed by sequentially connecting the subsequent pipe 7 to the rear end of the previous pipe 7 and installing it in the ground 10. In this way, the leading pipe 6 as a pipe to be put into the underground 10 first is pressed and the leading pipe 6 is propelled by excavating the underground 10 with the excavating machine 26, and succeeds the rear end of the leading pipe 6. Since the plurality of pipes 2 are installed in the underground 10 by sequentially connecting the pipes 7 and propelling the leading pipe 6, the pipes 2 having a short length in the direction along the central axis are used along the central axis. A support 11 having a long direction can be easily constructed. For example, even when the internal space of the tunnel cavity 100 is narrow, the support work 11 having a long length can be easily constructed by sequentially connecting the plurality of pipes 2. Moreover, since the pipe 2 can be shortened, the handling of the pipe 2 is facilitated and the work can be easily performed.
After the support work 11 is constructed, the excavating machine 26 is collected in the tunnel cavity 100 that is the starting point of excavation. According to the first embodiment, since the extension thrust transmission pipe 29a is sequentially added after the thrust transmission pipe 29, when the excavating machine 26 is recovered, the extension thrust transmission pipe 29a is extended from the rear side. The propulsive force transmission pipe 29a is pulled back into the tunnel cavity 100 by one length, and the extended propulsive force transmission pipe 29a; the propulsive force transmission pipe 29 is removed in order from the rearmost side to the leading propulsive force transmission pipe 29. The excavating machine 26 can be easily collected by going. In this case, the hydraulic jack 62 that is an example of the propulsion device 4 only needs to be installed in the tunnel cavity 100 that is the starting point of excavation, so that the device cost can be reduced.
The excavating machine 26 may be recovered in the tunnel cavity 100 on the reaching side. In this case, the operation of pushing the excavating machine 26 into the tunnel cavity 100 on the arrival side is easier than the operation of pulling the excavating machine 26 back into the tunnel cavity 100 that is the starting point of excavation. Work becomes easy. For example, as shown in FIG. 7A and FIG. 8, when the support 11 is constructed between the left and right tunnel cavities 100, the excavating machine 26 is collected in the tunnel cavities 100 on the arrival side, and the left and right tunnels are recovered. You may make it excavate from the cavity part 100 alternately. In this case, although it is necessary to install the hydraulic jacks 62 as an example of the propulsion device 4 in the left and right tunnel cavities 100, the recovery operation of the excavating machine 26 becomes easy. As shown in FIG. 7B, when the support 11 is constructed so as to start from one cavity 100 formed in the ground 10 and return to the cavity 100, the excavating machine 26 has one cavity. If the excavating machine 26 is recovered by pushing it out of the reaching port into the tunnel cavity 100 when it reaches the arrival port of the part 100, the excavating machine 26 can be easily recovered and the hydraulic jack 62 can be Since it is sufficient to install only in one tunnel cavity 100, the apparatus cost can be reduced.

  When constructing the support 11, in the present invention, as shown in FIGS. 5 and 6, the pipe 2 is installed in the ground so that the outer surfaces 7 a of the plurality of pipes 2 having a rectangular cross section are in contact with each other. May be. Thus, when the outer surfaces 7a; 7a of the pipe 2 having a rectangular cross section are brought into contact with each other, the contact area between the adjacent pipes 2; 2 is increased, so that they are surrounded by the support 11 in FIGS. It becomes easy to block the groundwater from outside the area from entering the area, and the subsidence of the ground outside the area can be prevented.

  According to the pipe installation method according to the first embodiment, even when the underground 10 is hard and mixed, the underground part near the corner inside the pipe 2 having a rectangular cross section is excavated by the rotary excavator 46; 46. Since it becomes possible, the pipe 2 can be smoothly promoted in the ground 10 and the support work 11 can be easily constructed.

Embodiment 2
As shown in FIGS. 10 to 12, the pipe installation device 1 </ b> A of the second embodiment includes a propulsive force transmission unit 70 instead of the propulsive force transmission plate 5 and the propulsion force transmission pipe 29 of the pipe installation device 1 of the first embodiment. In addition, the water supply mechanism 75 and the mud discharge mechanism 76 are provided, and a fixed excavation blade 77 is provided between the rotary excavation bodies 46; 46 constituting the twin header. Note that parts not specifically described in the second embodiment are the same as those in the first embodiment.

The propulsive force transmission unit 70 includes a propulsive force transmission rod-like body 71 and a propelling force transmitting member 72.
The propulsive force transmitting rod-like body 71 includes a rod-like body 71x whose length from one end 71a to the other end 71b is longer than the shortest distance between the rear surface 39 of the substrate 25 and the rear end edge 102e of the leading tube 6; An inclination preventing portion 71c that protrudes from the other end 71b side of the body 71x. The rod-shaped body 71x uses, for example, H-section steel, and the tilt prevention portion 71c uses, for example, a steel material that is joined to the H-section steel forming the rod-shaped body 71x by connection means such as welding or bolts. The tilt preventing portion 71c includes a face body 71d having a surface in contact with the left inner side surface 6a and the right inner side surface 6b of the leading pipe 6.
The propulsive force transmission rod-like body 71 is installed so that the central axis of the rod-like body 71x faces the same direction as the central axis of the leading pipe 6, and the surface of the face piece 71d and the left inner side surface 6a and the right inner side face of the leading pipe 6 The one end 71a and the rear surface 39 of the substrate 25 are joined by connection means such as welding or a bolt so that the surface 6b comes into surface contact.
That is, the left propulsive force transmission rod-shaped body 71A is installed so that the central axis of the rod-shaped body 71x faces the same direction as the central axis of the leading pipe 6, and the surface of the left propulsive force transmission rod-shaped body 71A of the face body 71d One end 71a of the rod-shaped body 71x of the left propulsive force transmission rod-shaped body 71A and the rear surface 39 of the substrate 25 are coupled by a connecting means such as welding or a bolt so that the left inner surface 6a of the leading pipe 6 is in surface contact. . Similarly, one end 71a of the rod-shaped body 71x of the right propulsive force transmission rod-shaped body 71B and the rear surface 39 of the substrate 25 are coupled by connection means such as welding or a bolt.
One ends 71a; 71a of the left and right propulsive force transmission rod-like bodies 71A; 71B are coupled to the central portion between the upper and lower edges of the substrate 25.
Then, the abutting member 72 is installed so as to straddle between the other ends 71b; 71b of the left and right propulsive force transmitting rod-like bodies 71A; 71B projecting rearward from the rear end edge 102e of the leading pipe 6 to the other ends 71b; 71b. By connecting by a pressing plate 64 of the hydraulic jack 62, the pressing force of the hydraulic jack 62 is applied by pressing the portion where the central axis of the leading pipe 6 is positioned in the abutting material 72. Since the material 72, the left and right propulsive force transmission rods 71A; 71B, the base plate 25, and the pipe side propulsive force receiving portion 21 are transmitted to the leading pipe 6 and the rotary excavating body 46; 46, the guide blade pipe 9 and the leading pipe are transmitted. 6 propels forward and the rotary excavator 46; 46 propels forward.
That is, the left propulsive force transmitting rod 71A, which is one propulsive force transmitting rod, is coupled to the central portion between the upper and lower edges on the left side edge of the rear surface 39 of the substrate 25, and the other propulsive force transmitting rod, right Are connected to the central portion between the upper and lower edges on the right edge side of the rear surface 39 of the substrate 25, and the right and left propulsive force transmitting rods 71A; 71B are pressed by the hydraulic jack 62 to propel the tube 2. Since it is set as the structure to be made, it becomes possible to apply a pressing force equally to the right and left of the pipe 2.

The water supply mechanism 75 includes a water storage tank 75a, a water supply hole 75b penetrating through the front surface 39f and the rear surface 39 of the substrate 25, a water supply pipe 75c formed of, for example, a bellows tube or a steel pipe, and a pump for water supply. 75d and a connecting pipe 75e.
For example, one end of the water supply pipe 75c is connected to the inside of the water supply hole 75b so that the one end opening of the water supply pipe 75c communicates with the space 69 surrounded by the front surface 39f of the substrate 25 and the inner surface 20 of the leading pipe 6. The water supply hole 75b and one end of the water supply pipe 75c are coupled by screwing. The other end opening of the water supply pipe 75c and the discharge port of the water supply pump 75d are connected so as to communicate with each other, and the suction port of the water supply pump 75d and the water storage tank 75a are connected so as to communicate with each other through the connection pipe 75e. Is done.
The mud drain mechanism 76 includes a mud hole 76a penetrating the front surface 39f and the rear surface 39 of the substrate 25, a mud pipe 76b formed of, for example, a bellows tube or a steel pipe, a pump 76c for draining mud, A tank 76d and a connecting pipe 76e are provided.
For example, one end of the mud pipe 76b is screwed inside the mud hole 76a so that the one end opening of the mud pipe 76b communicates with the space 69, so that the mud hole 76a and the mud pipe 76b are connected. One end is joined. The other end opening of the mud pipe 76b and the suction port of the mud pump 76c are connected so as to communicate with each other, and the discharge port of the mud pump 76c and the mud tank 76d can be communicated with each other through the connecting pipe 76e. Connected to
The water storage tank 75a and the waste mud tank 76d are constituted by a collective tank 75X in which the water storage tank 75a and the waste mud tank 76d are integrated. That is, the partition 75w is provided inside the collective tank 75X to divide the collective tank 75X into two regions, one region is used as the water storage tank 75a, and the other region is used as the waste mud tank 76d.
That is, when a certain amount of water is initially filled in the collecting tank 75X, and the water pump 75d is driven to pump water into the space 69, the water pumped into the space 69 and the excavating machine 26 excavate. Muddy water is mixed with the earth and sand. Then, the mud water in the space 69 is discharged into the mud tank 76d by driving the mud pump 76c. Mud in the muddy water discharged to the waste mud tank 76d settles on the bottom of the waste mud tank 76d, and the muddy water that has entered the water storage tank 75a beyond the partition 75w enters the space 69 again by the water pump 75. Pumped. That is, since the muddy water can be circulated and supplied into the space 69, the amount of water used can be reduced. Further, since muddy water having a specific gravity greater than that of water can be supplied into the space 69, the pressure of the ground and groundwater can be resisted, and the pressure of the ground and groundwater and the pressure in the space 69 can be easily equalized. , The influence on the ground can be reduced. Moreover, since the inside of the space 69 becomes muddy water, the mud can be drained smoothly and excavation is facilitated.
The coupling structure between the water supply hole 75b and one end of the water supply pipe 75c and the coupling structure between the mud hole 76a and one end of the mud pipe 76b may be the following coupling structure.
An unillustrated pipe portion communicating with the holes (water supply hole 75b, mud drain hole 76a) is formed on the rear surface 39 of the substrate 25, and the open end face of the pipe portion and the pipe (water feed pipe 75c, mud drain pipe). 76b) The pipe part and the pipe are joined by covering the abutting part with the annular joint member in a state where the one end opening end face is abutted against each other, or the pipe part is fitted into the pipe via the one end opening of the pipe Then, the tube portion and the tube are joined by tightening the outer peripheral surface of the one end opening portion of the tube with an annular clip member.
The muddy water may be filled in the collecting tank 75X from the beginning, and the muddy water may be circulated between the space 69 and the collecting tank 75X by driving the pump 75d for water supply.

In the second embodiment, after the leading pipe 6 is installed in the ground 10 leaving the trailing end portion 102 of the leading pipe 6 (see FIG. 1), the subsequent pipe 7 is welded to the trailing edge 102e of the leading pipe 6; Alternatively, by connecting the other end 71b of the leading propulsive force transmitting rod 71 and one end 71a of the following propelling rod transmitting body 71 by bolts or welding together with a fixing device such as a bolt, the leading end The following propulsive force transmission rod 71 is added behind the propulsion force transmission rod 71. Further, an extension pressure hose (not shown) is added to the other end of the pressure hose 56, an extension water supply pipe (not shown) is added to the other end of the water supply pipe 75c, and an extension drain mud (not shown) is connected to the other end of the mud pipe 76b. The pipe is added.
Then, the abutting member 72 is installed so as to straddle between the other ends 71b; 71b of the left and right propulsive force transmitting rods 71A; 71B protruding rearward from the rear end edge of the succeeding tube 7, and the succeeding tube in the abutting material 72 7 is pressed by the piston rod 63 of the hydraulic jack 62.
Thereafter, similarly, the subsequent succeeding pipe 7 is sequentially connected to the rear end edge of the preceding succeeding pipe 7 and installed in the ground 10 to construct the support 11 as shown in FIGS. 7 to 9. it can.
In addition, after constructing the support work 11, the excavating machine 26 is collected in the tunnel cavity 100 which is the excavation start point. According to the second embodiment, since the propulsive force transmission rod-shaped body 71 is added, when the excavating machine 26 is recovered, one of the propulsive force transmission rod-shaped bodies 71 from the rearmost propulsive force transmission rod-shaped body 71 side. The excavating machine 26 can be easily recovered by pulling it back into the tunnel cavity 100 by the length and detaching the propelling force transmission rod 71 in order from the rearmost side to the front. Also in this case, the hydraulic jack 62, which is an example of the propulsion device 4, only needs to be installed in the tunnel cavity 100 that is the starting point of excavation, so that the device cost can be reduced.
As described in the first embodiment, if the excavating machine 26 is recovered in the tunnel cavity 100 on the arrival side, the recovery operation of the excavating machine 26 is facilitated as in the first embodiment.

According to the second embodiment, the left propulsive force transmitting rod 71A, which is one propulsive force transmitting rod, is coupled to the central portion between the upper and lower edges on the left edge side of the rear surface 39 of the substrate 25, and the other propulsive force is transmitted. The right propulsive force transmitting rod-shaped body 71B, which is a rod-shaped body, is coupled to the central portion between the upper and lower edges on the right edge side of the rear surface 39 of the substrate 25, and the left and right propulsive force transmitting rod-shaped bodies 71A; The front pipe 6 is propelled by pushing at 62, and the left and right propulsive force transmission rod-like bodies 71A; 71B are sequentially added to the left and right propulsive force transmission rod-like bodies 71A; The right and left propulsive force transmission rods 71A and 71B are sequentially pressed by the hydraulic jack 62 to sequentially propel the succeeding pipe 7, so that a pressing force is evenly applied to the left and right of the leading pipe 6 and the succeeding pipe 7. Preparative will be able to, can be straight accurately promote top tube 6 and trailing tube 7 in the propulsion direction of the appointment.
Further, the propulsive force transmission rod-like body 71 includes an inclination preventing portion 71c having a face body 71d that is in surface contact with the left inner side surface and the right inner side surface of the leading pipe 6 and the succeeding pipe 7. When the pressing force from the hydraulic jack 62 is applied, the propulsive force transmission rod 71 can be prevented from tilting to the left inner surface side or the right inner surface side of the leading pipe 6 or the succeeding pipe 7. The pressure can be reliably transmitted to the substrate 25.

  In the second embodiment, two hydraulic jacks 62; 62 may be used. In this case, the rear ends of the other ends 71b; 71b of the abutting material 72 are individually pressed by the hydraulic jacks 62, or the other ends of the left and right propulsive force transmitting rod-like bodies 71A; 71B without using the abutting material 72. 71b; 71b may be individually pressed directly by the hydraulic jack 62.

  Further, according to the second embodiment, the water supply mechanism 75 for supplying water into the space 69 and the mud drain mechanism 76 for discharging mud water in the space 69 are provided, and the water storage tank 75a and the mud tank are provided. Since the collecting tank 75X integrated with 76d is used, when the pipe 2 is propelled, the muddy water is circulated by driving the pump 75d for water supply and the pump 76c for waste mud by a control device (not shown). Since the water can be supplied into the space 69, the amount of water used can be reduced, and the pressure of the ground and groundwater and the pressure in the space 69 can be easily equalized. The influence can be reduced, and the inside of the space 69 becomes muddy, so that the mud can be drained smoothly and the effect of facilitating excavation can be obtained.

  Further, in the pipe installation device 1A of the second embodiment, as shown in FIGS. 10 to 12, a fixed excavation blade portion 77 is provided between the rotary excavation bodies 46; 46. The excavation blade portion 77 is provided so as to protrude forward from the tip of the branch column 43. With this configuration, the ground between the rotary excavating bodies 46; 46 can be excavated by the excavating blade portion 77 as the leading pipe 6 is propelled, and the leading pipe 6 can be more smoothly propelled. become.

  In addition, since the housing 50 is installed away from the left and right inner surfaces of the guide blade tube 9 so as not to contact the left and right inner surfaces of the guide blade tube 9, the housing 50 is disposed between the housing 50 and the left and right inner surfaces of the guide blade tube 9. The ground may not be excavated. Therefore, in the second embodiment, the excavation bit 52 located on the center side of the leading pipe 6 is provided so as to extend in a direction orthogonal to the central axis (center line L) of the casing 50, and as shown in FIG. The excavation bit 52 a (52) located on the left side of the leading pipe 6 is provided so as to extend to the left side of the leading pipe 6 as close as possible to the left inner surface of the guide blade pipe 9, and further on the right side of the leading pipe 6. The excavation bit 52 that is positioned is extended to the right side of the leading pipe 6 as far as possible to a position that is as close to the right inner surface of the guide blade tube 9 as possible. The ground located at the left and right corners of the pipe 6 can be excavated more effectively.

  In the first embodiment, the rotary excavation body 46; 46 is installed so that the tip 80 of the excavation bit 52 is located on the rear side of the cutting edge 81 of the guide blade tube 9. In the second embodiment, as shown in FIG. As described above, the rotary excavator 46; 46 was installed so that the tip 80 of the excavation bit 52 protrudes forward from the cutting edge 81 of the guide blade tube 9. In this way, since the ground located in front of the cutting edge of the guide blade tube 9 can be reliably excavated by the excavation bit 52, the cutting edge 81 of the guide blade tube 9 collides with the hard ground and propels the leading pipe 6. The situation that can not be done can be reduced. Further, the rotary excavator 46; 46 may be installed so that the tip 80 of the excavation bit 52 and the cutting edge 81 of the guide blade tube 9 are located on one plane orthogonal to the central axis of the guide blade tube 9. That is, the rotary excavator 46; 46 may be installed so that the tip 80 of the excavation bit 52 is positioned inside the guide blade tube 9, or the tip 80 of the excavation bit 52 is more than the cutting edge 81 of the guide blade tube 9. You may install the rotary excavation body 46; 46 so that it may protrude ahead.

  In addition, you may use the excavation machine 26 provided with the rotary excavation body 46 or 3 or more. Further, the excavating machine 26 is provided with the excavation bit 52 on the side surface of the casing 50 in contact with the underground side of the rotary excavating body 46; 46, so that the rotary excavating body 46; Any rotary excavator 46 that rotates around the rotation center line intersecting the propulsion direction of the leading pipe 6 as a rotation center may be used.

The guide blade tube 9 may be formed by a tube integral with the leading tube 6. For example, an inclined surface such as the blade portion 14 may be formed on the inner surface of the tip 8A of the leading tube 6, and the guide blade tube 9 may be configured by the inclined surface.
Further, the guide blade tube 9 and the leading tube 6 have the same outer diameter, and the rear end edge surface of the guide blade tube 9 and the tip opening edge surface 18 of the leading tube 6 are all-around welded or spot welded. May be.

  Also, do not connect the following pipe to the rear end of the pipe that goes into the ground first, and install only the pipe that goes into the ground first from the cavity formed in the ground, and You may make it form the support work only by the pipe | tube put in.

2 pipes, 10 underground, 26 excavating machines, 46 rotating excavated bodies, 100 cavities,
L Rotation center line.

Claims (8)

  When installing a pipe with a rectangular cross-section into the ground from a cavity formed in the ground, an excavating machine is installed inside the top opening side of the pipe to be put into the ground first, and the pipe is pressed and drilled. In the underground pipe installation method in which the pipe is propelled and installed in the ground by excavating the underground with a machine, as the excavating machine, the rotation that rotates around the rotation center line that intersects the pipe propulsion direction A pipe installation method in the ground using an excavation machine having an excavation body.   A tube having a rectangular cross-section is continuously spanned between one cavity and the other cavity formed in the ground, or starting from the cavity formed in the ground When constructing a support work by installing it in the ground so that it returns, install a drilling machine inside the top opening side of the pipe that goes into the ground first, press the pipe and In the underground pipe installation method in which the pipe is propelled by excavation and installed in the ground, the excavating machine has a rotary excavator that rotates about the rotation center line that intersects the propulsion direction of the pipe. An underground pipe installation method characterized by using an excavating machine.   The pipe installation method according to claim 1 or 2, wherein the pipe is a curved pipe having a rectangular cross-section that is bent and extended so as to draw an arc.   The leading pipe is pushed by pushing the leading pipe as the pipe that goes into the ground first, and excavating the underground with a drilling machine, and the trailing pipe is sequentially connected to the rear end of the leading pipe to promote the leading pipe. 4. The underground pipe installation method according to any one of claims 1 to 3, wherein a plurality of pipes are installed underground.   5. The rotary excavator, which is a rotary excavator that rotates about a rotation center line orthogonal to a propulsion direction of a pipe that is first inserted into the ground, is used as a rotary excavator. 6. The pipe installation method in the ground described in 1.   The tip of the excavation blade provided in the rotary excavation body is located on the rear side of the tip of the guide blade tube installed at the tip of the tube to be put into the ground first. Item 6. The pipe installation method according to any one of items 5 to 9.   7. The underground pipe installation method according to any one of claims 1 to 6, wherein a plurality of pipes are installed in the ground such that adjacent outer surfaces come into contact with each other.   When installing in the ground from the hollow part formed in the ground, it is installed inside the top opening side of the tube with a rectangular cross-section that goes into the ground first, and the rotation center line intersecting the propulsion direction of the tube is the center of rotation An excavator provided with a rotating excavator that rotates as described above.

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