JP2012167520A - Pipe installation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for installing a pipe in the underground, capable of smoothly propelling a pipe in the underground, even in the underground containing gravel.SOLUTION: A pipe installation device comprising a pipe (head pipe 6), a base plate 25 which is disposed movable in the pipe in watertight contact with the inner peripheral surface of the pipe in the direction along the central axis of the pipe, an excavator 26 which is disposed in front of the base plate, a water supply mechanism 75 which supplies water into an excavated sediment intake space surrounded by the front face of the base plate and the inner peripheral surface of the pipe, and a sludge discharge mechanism 76 which discharges the excavated sediment taken in the excavated sediment intake space to outside of the excavated sediment intake space, further comprises a gravel intake box 99 which is capable of taking gravel entering inside of the pipe ahead of the base plate 25 through the underground excavation by the excavator into a space at the rear side of the front face 39f of the base plate through a gravel intake through-hole 91 formed in the base plate 25 so as to accommodate the taken gravel without leakage to the inside of the pipe at the rear of the base plate 25.

Description

  The present invention relates to a pipe installation device for installing a pipe in the ground.

  Conventionally, a pipe installation device for installing a pipe in the ground is known. For example, a drilling machine having a rotary excavator that excavates the ground by rotating a bit about the center axis of the pipe as the center of rotation is installed inside the top opening side of the top pipe that enters the ground first, In addition, it has a configuration with an injection device for excavating the soil near the corner inside the pipe that is not excavated by the rotary excavator, and presses the pipe and excavates the ground with an excavating machine and high-pressure water. An apparatus for propelling a pipe and installing it in the ground is known (for example, see Patent Document 1).

JP 2005-83007 A

In the pipe installation device described above, mud that accumulates inside the top pipe by excavating underground is discharged from the inside of the pipe to the outside of the pipe using a drainage pipe, etc., but the underground is mixed with gravel. When it is underground, gravel in the mud accumulates in the drainage pipe, and the efficiency of drainage deteriorates, and there is a possibility that the pipe cannot be smoothly pushed into the ground.
The present invention has been made in view of the above-described problems, and provides a pipe installation device for underground that can smoothly promote the pipe in the ground even when the underground is underground with gravel. .

According to the present invention, a pipe, a substrate provided so as to be movable in the direction along the central axis of the pipe while keeping water tightness with the inner peripheral surface of the pipe, and an excavation machine provided on the front surface of the board And a water supply mechanism for supplying water into the excavated earth and sand taking-in space, which is a space surrounded by the front surface of the substrate and the inner surface of the pipe, and the excavated earth and sand taking-in space into the excavated earth and sand taking-in space A pipe that is installed in the ground from a hollow part that is formed in the ground by pushing the pipe while excavating the ground located in front of the pipe with a drilling machine. In the installation device, the gravel that has entered the inside of the pipe ahead of the substrate by excavating the ground with an excavating machine is taken in behind the front surface of the substrate through the through hole for gravel intake formed in the substrate. Accommodates possible gravel so that it does not leak inside the tube behind the substrate. Since the gravel intake box is provided, even if the ground is underground with gravels, the gravel is taken into the gravel intake space of the gravel intake box, so that the gravel in the mud accumulates in the drainage pipe. Can be suppressed, and the tube can be smoothly pushed into the ground.
The gravel capture box includes a gravel capture space forming body that is attached to the substrate so as to communicate with the gravel capture through-hole, and forms a gravel capture space that extends backward from the front surface of the substrate. It is provided so that it can move in the direction along the central axis of the pipe while keeping the water tightness with the inner peripheral surface of the space forming body, and it becomes the rear end wall of the gravel intake box In the gravel collection box, which is partitioned by the inner peripheral surface of the gravel intake space forming body and the front surface of the movable partition wall by moving the movable partition wall in a direction along the central axis of the pipe. Since the gravel intake space volume variable means that changes the volume of gravel intake space is provided, it is possible to prevent the situation where gravel accumulates in the gravel intake space and the gravel cannot be taken into the gravel intake space. And because the volume of gravel intake space can be increased and more gravel can be taken into the gravel intake space, From being accumulated in the mud pipe can be suppressed for a long time, it is possible to propel smoothly tube into the ground.
Since there is a suction means to suck in the gravel intake box, it is possible to prevent the situation where mud soil accumulates in the gravel intake space and the gravel cannot be taken in, ensuring the gravel intake space in the gravel intake space Therefore, it is possible to prevent the gravel in the mud from accumulating in the mud pipe for a long time, and the pipe can be smoothly pushed into the ground.
Since the through hole for gravel intake is formed on the lower side of the substrate, gravel is easily taken into the gravel intake space of the gravel intake box by the momentum of the muddy water supplied into the excavated earth and sand intake space. Become.
The tube and the substrate are formed in a rectangular shape, the through hole for gravel intake is formed by cutting out the two corners on the lower edge side of the substrate, the gravel capture box is a long plate with an L-shaped cross section and the rectangular shape of the tube Since it is formed by a box having a rectangular cross section surrounded by the corners of the cross section, the material cost for forming the gravel taking-in box can be saved.

Sectional drawing of a pipe | tube installation apparatus (Embodiment 1). FIG. 3 is a perspective view showing the inside of the leading pipe (first embodiment). (A) is AA sectional drawing of FIG. 1, (b) is AA sectional drawing of (a) (Embodiment 1). The figure which shows the installation method of the pipe | tube in the ground (Embodiment 1). The perspective view which shows the shape and installation form of a curved pipe (Embodiment 1). Sectional drawing which shows the example of the support construction constructed | assembled by the pipe installation method which installs a straight 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).

Embodiment 1
Based on FIG. 1 thru | or FIG. 7, the basic composition and operation | movement of the pipe installation apparatus 1 for implement | achieving the pipe installation method in the underground by Embodiment 1 are demonstrated.
As shown in FIG. 1, the pipe installation device 1 includes a pipe 2, an excavation device 3, a propulsion device 4, a propulsion force transmission device 70, and gravel taking-in means 90. In the following, the upper side in FIG. 1 is defined as the head or front side of the tube 2 or the tube installation device 1, the lower side in FIG. 1 is defined as the rear side of the tube 2 or the tube installation device 1, and the left and right sides in FIG. The left and right sides of the tube 2 and the tube installation device 1 are defined, and the upper and lower sides in the direction orthogonal to the paper surface of FIG. In FIG. 2, 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 to bend and extend so as to draw an arc as shown in FIG. 5; FIG. 7, or as shown in FIG. A tube that extends straight (a tube having a straight tube center axis (hereinafter referred to as a straight tube)) and has a rectangular cross-section when the tube is cut along a plane perpendicular to the tube center axis. It is formed by. As the pipe 2, for example, a steel pipe is used. The size of the tube 2 is, for example, a tube length (front-rear length) of 1.5 m, a left-right width of 1.2 m, and a vertical width of 0.7 m.
Then, as shown in FIG. 5 and FIG. 7, a support work 11 that is bent and extended so as to draw an arc is constructed in the underground 10 by sequentially connecting a plurality of bent pipes and installing them in the underground 10. As shown in FIG. 6, 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. 5, the support 11 constructed in the ground by the pipe installation device 1 and the pipe installation method of the first embodiment includes a pipe 2 (hereinafter referred to as the top pipe) positioned at the head and a plurality of subsequent pipes. It is formed by the tube 2 (hereinafter, referred to as a subsequent tube). That is, the supporting work 11 is a continuous curved pipe formed by a leading pipe 6 which is a curved pipe located at the leading end and a succeeding pipe 7 which is a plurality of succeeding curved pipes provided so as to follow the leading pipe 6. 67.
As shown in FIG. 7A, the support work 11 includes a plurality of bends as a plurality of pipes 2 so as to straddle between one cavity 100 formed in the ground 10 and the other cavity 100. As shown in FIG. 7 (b), a plurality of pipes 2 starting from a cavity 100 formed in the ground 10 and returning to the cavity 100 as shown in FIG. As shown in FIG. 6, a plurality of support pipes 11 constructed by continuously connecting a plurality of curved pipes, and a plurality of pipes 2 as a plurality of pipes 2 so as to straddle between one cavity 100 and the other cavity 100. There is a support 11 constructed by installing straight pipes continuously.

Hereinafter, the configuration of the pipe installation device 1 will be described with reference to FIGS. 1 to 3.
For example, as shown in FIG. 1, the leading pipe 6 has a guide blade section that functions as a guide blade section provided at the tip of the pipe 6x. And 9. 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 leading tube 6 is formed by connecting the other opening end of the guide blade tube 9 and the opening end 8 at the tip of the tube 6x. In this case, for example, the outer diameter of the guide blade tube 9 is larger than the outer diameter of the tube 6x, and the inner periphery of the tube at the opening end surface 15 is located on the other opening end surface 15 side of the guide blade tube 9. The surface side is shaved and a step is provided to form a fitting hole 16 into which the opening end 8 at the tip of the tube 6x is fitted. Then, the opening end 8 at the tip of the tube 6x is fitted into the fitting hole 16 provided in the other opening 17 of the guide blade tube 9, and both of them are connected outside the figure such as bolting and welding. By connecting by means, the other opening end of the guide blade tube 9 and the opening end 8 at the tip of the tube 6x are connected. In this way, the opening end 8 at the tip of the tube 6x is fitted into the fitting hole 16 provided in the other opening 17 of the guide blade tube 9, and the guide blade tube 9 is at the end opening end face 18 of the tube 6x. When the tube 6x is propelled, the tip opening end face 18 of the tube 6x does not receive the resistance of the underground 10 and the propulsion resistance can be reduced. In addition, since the fitting hole 16 for fitting the opening end 8 at the tip of the tube 6x is formed, the guide blade tube 9 can be easily installed at the tip of the tube 6x, and the leading tube 6 is formed. The assembly of the tube 6x and the guide blade tube 9 can be facilitated. In this case, a step is generated between the tube 6x and the guide blade tube 9 on the rectangular outer peripheral surface of the leading tube 6, and this step maintains the watertight performance outside the figure provided at the starting and reaching ports of the cavity 100. The member is formed small (for example, about 1 cm) to such an extent that the waterproof performance between the starting port and the reaching port of the hollow portion 100 and the rectangular outer peripheral surface of the pipe 2 can be maintained.

The outer diameter of the guide blade tube 9 and the tube 6x is the same diameter, and the boundary portion of the guide blade tube 9 is welded all around with the other opening end surface of the guide blade tube 9 and the tip opening end surface 18 of the tube 6x abutting each other. Alternatively, the leading pipe 6 may be formed by spot welding.
Alternatively, a tube formed on a guide blade portion whose tip side functions as the guide blade tube 9 may be used as the leading tube 6.
In this way, the step on the rectangular outer peripheral surface of the leading pipe 6 can be reduced or no step occurs, so that the cavity portion is provided by a watertight performance maintaining member (not shown) provided at the starting port and the arrival port of the cavity portion 100. The water stop performance between 100 starting ports and reaching ports and the rectangular outer peripheral surface of the pipe 2 can be maintained well.

  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 25 provided in the excavating device 3 to be described later and propels the top tube 6. The tube-side propulsive force receiving portion 21 is formed to have a rectangular frame outer peripheral dimension corresponding to a rectangular shape that goes around the inner surface of the cross section of the front tube 6 (a cross section when the front tube is cut by a plane orthogonal to the central axis of the front tube). The rectangular frame 22 is formed by the rectangular frame 22, and the rectangular frame 22 is installed in a state where the outer peripheral surface 23 of the rectangular frame 22 and the inner peripheral surface 20 a of the tube of the leading tube 6 correspond to each other. Is fixed to the inner peripheral surface 20a by a connecting means (not shown) such as welding, bolts and nuts.

The excavation apparatus 3 includes a substrate 25, an excavation machine 26, a drive source 27, a water supply mechanism 75, and a mud discharge mechanism 76.
The substrate 25 is arranged so that the center axis of the leading tube 6 and the center axis of the substrate 25 coincide with each other, and the center of the leading tube 6 is placed inside the leading tube 6 while being watertight with the inner peripheral surface 20a of the leading tube 6. It is provided so as to be movable in the front-rear direction along the axis. 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 and the frame rear surface 32 of the rectangular frame 22 that forms the tube-side thrust receiving portion 21 are formed to face each other. 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 A performance maintaining member (packing) 35 is provided. The watertight performance maintaining member 35 is, for example, a rectangular 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. The frame 36 is formed. Therefore, the propulsive force transmitted to the substrate 25 is transmitted to the pipe-side propulsive force receiving portion 21 via the watertight performance maintaining member 35, whereby the pipe 2 and the excavating machine 26 are propelled together.
One end of the support portion 40 of the excavating machine 26 is fixed to the central portion of the front surface 39 f of the substrate 25.
That is, the substrate 25 is a space surrounded by a function of propelling the excavating machine 26 and the leading pipe 6 forward by receiving a propulsive force from the propulsion device 4, and the front surface 39 f of the substrate 25 and the inner surface 20 of the leading pipe 6. It has a function as a partition wall for partitioning the excavated earth and sand taking-in space 69a and the space 69b surrounded by the rear surface 39 of the substrate 25 and the inner surface 20 of the top pipe 6 in a watertight manner.
Further, a through hole 38a through which a pressure hose 56 (described later) passes and a gravel taking through hole 91 for connecting the excavated earth and sand taking space 69a and the space 69b are formed at the center of the substrate 25.
As will be described later, the excavating machine 26 is provided on the front surface 39f of the substrate 25, and the gravel taking-in means 90, the water supply pipe 75c, the drainage pipe 76b, and the propulsive force transmission rod 71 are provided on the rear surface 39 of the substrate 25. Provided.

The excavating machine 26 includes a support unit 40 and a rotating unit 41.
The support portion 40 is formed by a T-shaped hollow column in which one column 42 and two branch columns 43 are combined. 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 tip end portion (the other end portion) of the columns 42. That is, one end of the support column 42 is fixed to the substrate 25 so that the T-shaped hollow path of the support portion 40 communicates with the through hole 38a. 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 (excavation blades) 52 provided on the outer peripheral surface 51 of the housing 50.

  As the motor 47, for example, 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, a pressure hose 56 in which a 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 with That is, the pressure hose 56 is connected to the casing 48 of the hydraulic motor 47 through the through hole 38 a and the T-shaped hollow path of the support portion 40. The hydraulic motor 47 is configured such that the rotating shaft 49 is rotated by pressure oil supplied into the casing 48 via the pressure hose 56.

For example, the other end closed inner surface 53 of the casing 50 and the hydraulic pressure are adjusted so that the center of the other end closed inner surface (inner bottom surface of the casing) 53 of the casing 50 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 a motor 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, as shown in FIG. 1, the rotary excavator 46; 46 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. Although not shown, the rotary excavator 46; 46 is installed so that the tip 80 of the excavation bit 52 protrudes forward from the cutting edge 81 of the guide blade tube 9, or the tip 80 of the excavation bit 52 is The rotary excavator 46; 46 is installed so as to be located in the leading pipe 6.

  If the excavating operation of the rotary excavating body 46; 46 is performed by causing the tip 80 of the excavating bit 52 to protrude forward from the cutting edge 81 of the guide blade tube 9, the ground located in front of the cutting edge of the guide blade tube 9 is excavated. Since the excavation can be surely performed by the bit 52, it is possible to reduce a situation in which the cutting edge 81 of the guide blade tube 9 collides with the hard ground and the leading tube 6 cannot be pushed. For example, the rotary excavator is configured such that the tip 80 of the excavation bit 52 projects forward from the cutting edge 81 of the guide blade tube 9 so that the rotation center axis L and the cutting edge 81 of the guide blade tube 9 are located on the same plane. If the excavation operation by 46; 46 is performed, the ground located in front of the cutting edge of the guide blade tube 9 can be more reliably excavated by the excavation bit 52, and the tube 2 can be more easily propelled. Installation work can be performed more smoothly.

  Further, if the leading pipe 6 is propelled and the rotary excavating body 46; 46 is excavated with the tip 80 of the excavating bit 52 positioned in the leading pipe 6, the guide blade pipe 9 pierced into the ground 10 is used. Since only the underground part that enters the inside of the blade edge is excavated by the excavation bit 52, the excessive excavation part of the underground 10 is reduced, and the influence on the underground 10 such as ground subsidence can be reduced.

A fixed excavator 77 is provided between the rotary excavators 46;
The fixed excavation body 77 is attached in a fixed state to the front outer peripheral surface of the boundary portion between the two branch columns 43; 43 so as to protrude forward from the branch column 43 by fixing means such as welding or bolts and nuts.
The fixed excavation body 77 is formed in, for example, a curved shape in which the central portion between the upper and lower sides bulges toward the cutting edge 81 side of the guide blade tube 9, and the center between the left and right widths of the curved surface is along the circumferential direction of the curved surface. It is the structure formed so that it might become a continuous sharp blade shape.
Thus, since the fixed excavation body 77 has a configuration in which the central portion between the upper and lower sides is formed in a curved shape that bulges toward the cutting edge 81 side of the guide blade tube 9, the resistance of the ground when the leading tube 6 is propelled. Thus, the leading pipe 6 can be more smoothly propelled.

When the fixed excavation body 77 is not provided, the excavated earth and sand may be clogged between the rotary excavation bodies 46; 46, but the fixed excavation body 77 is interposed between the rotary excavation bodies 46; 46. When the fixed excavation body 77 collides with the ground by propelling the head pipe 6, the fixed excavation body 77 cuts the ground or distributes the earth and sand and rocks in the collided ground portion to the left and right. 46:46, the leading pipe 6 can be promoted more smoothly.
For example, as shown in FIG. 1, the center between the upper and lower sides of the fixed excavation body 77, the excavation bit 52 of the rotary excavation body 46, and the cutting edge 81 of the guide blade tube 9 are on the same plane perpendicular to the central axis of the top tube 6. Configured to be located.
In this way, the center between the upper and lower sides of the fixed excavation body 77, the excavation bit 52 of the rotary excavation body 46, and the cutting edge 81 of the guide blade tube 9 are configured to be located on the same plane perpendicular to the central axis of the top tube 6. In this case, as described above, the fixed excavation body 77 can be easily excavated by inducing cracks in the ground prior to excavation, and the fixed excavation body 77 collides with the ground and the top pipe It can also be prevented that 6 is not promoted.

In addition, you may comprise so that the center between the upper and lower sides of the fixed excavation body 77 may be located behind or ahead of the excavation bit 52 of the rotary excavation body 46 and the cutting edge 81 of the guide blade tube 9.
When the center between the upper and lower sides of the fixed excavation body 77 is configured to be positioned in front of the excavation bit 52 of the rotary excavation body 46 and the cutting edge 81 of the guide blade tube 9, the fixed excavation body 77 is placed on the ground prior to excavation. The effect that it becomes easy to excavate by inducing a crack is also acquired.
Conversely, if the center between the upper and lower sides of the fixed excavation body 77 is positioned behind the excavation bit 52 of the rotary excavation body 46 and the cutting edge 81 of the guide blade tube 9, excavation is performed when the ground is hard. It can be prevented that the fixed excavation body 77 collides with the ground before the cutting edge 81 of the bit 52 or the guide blade tube 9 and the leading tube 6 is not propelled.

  Further, the tip shape of the fixed excavation body 77 is such that the top pipe 6 collides with the ground by propelling the ground pipe, and the left and right rotary excavation bodies 46: It may be formed in a shape that can achieve the role of directing to 46, or inducing cracks in the ground prior to excavation to facilitate excavation. For example, as described above, the tip of the front tip may be formed in a sharp blade shape, or the tip of the front tip may be formed in a plane shape, and the shape is such that the ground is easily excavated and broken depending on the geology of the ground. Should be selected.

Further, since the casing 50 of the rotary excavator 46 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, It may be difficult to excavate the ground between the inner surface.
Therefore, 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 housing 50, and as shown in FIGS. The excavation bit 52a (52) located on the left side of the leading pipe 6 is provided to extend to the left side of the leading pipe 6 as close as possible to the position on the left inner surface of the guide blade pipe 9, and is further located on the right side of the leading pipe 6. The excavation bit 52b (52) is extended to the right side of the leading pipe 6 as far as possible to a position 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 front pipe 6 can be excavated more effectively.

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, a water supply pipe is provided inside the water supply hole 75b so that one end opening of the water supply pipe 75c communicates with the excavated earth and sand taking-in space 69a 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 one end of the 75c. 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 excavated sediment collection space 69a. One end of the mud pipe 76b is coupled. That is, the mud discharge pipe 76b discharges the excavated earth and sand taken into the excavated earth and sand intake space 69a, which is a space surrounded by the front surface 39f of the substrate 25 and the inner surface 20 of the leading pipe, to the outside of the excavated earth and sand intake space 69a. It is a tube for.
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 excavated soil intake space 69a, the water is pumped into the excavated soil intake space 69a. The mixed water and the earth and sand excavated by the excavating machine 26 become muddy water. Then, by driving the pump 76c for discharging mud, mud water in the excavated earth and sand taking-in space 69a is discharged to the mud tank 76d. Mud in the mud discharged to the waste mud tank 76d settles to the bottom of the waste mud tank 76d, and the mud that has entered the water storage tank 75a beyond the partition 75w is taken in again by the pump 75d for water supply. It is pumped into the space 69a. That is, since the muddy water can be circulated and supplied into the excavated earth and sand taking-in space 69a, 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 excavated earth and sand intake space 69a, it can resist the pressure of the ground and groundwater, and the pressure of the ground and groundwater is equal to the pressure in the excavated earth and sand intake space 69a. Therefore, the influence on the underground 10 such as land subsidence can be reduced. Moreover, since the inside of the excavation earth and sand taking-in space 69a becomes muddy water, mud can be drained smoothly and excavation becomes easy.

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, and the opening end face of the pipe portion and the pipe (water supply pipe 75c, mud drain pipe 76b). In the state where the end face of the open end of the pipe is abutted with each other, the pipe part and the pipe are joined by covering the abutting portion with the annular joint member, or the pipe part is fitted into the pipe through the one end opening of the pipe The pipe part and the pipe are joined by tightening the outer peripheral surface of the one end opening of the pipe with an annular clip member.
Alternatively, muddy water may be filled in the collecting tank 75X from the beginning, and the water pump 75d may be driven to circulate the muddy water between the excavated earth and sand intake space 69a and the collecting tank 75X.

  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.

The propulsive force transmitting device 70 includes a propulsive force transmitting rod-like body 71, a propelling force transmitting pad 72, the above-described substrate 25, the above-described watertight performance maintaining member 35, and the above-described tube-side propulsive force receiving portion 21. Is provided.
The propulsive force transmission rod 71 has 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 surface 102e of the leading tube 6; A tilt prevention portion 71c that protrudes from the other end 71b side of 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 transmitting 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 top tube 6, and 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. . Further, the right propulsive force transmitting rod-shaped body 71B 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 right propulsive force transmitting rod-shaped body 71B of the face 71d One end 71a of the rod-shaped body 71x of the right propulsive force transmitting rod-shaped body 71B and the rear surface 39 of the substrate 25 are coupled by a connecting means such as welding or a bolt so that the right inner surface 6b of the leading pipe 6 is in surface contact. .
One ends 71a; 71a of the left and right propulsive force transmission rods 71A;

Then, the abutting member 72 is installed so as to straddle between the other end 71b; 71b of the left and right propulsive force transmitting rod-like bodies 71A; By connecting with a bolt or a vise device outside and pressing the portion where the central axis of the leading pipe 6 in the abutting member 72 is positioned with the pressing plate 64 of the hydraulic jack 62, the pressing force by the hydraulic jack 62 is changed to the abutting material. 72, the right and left 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, so that the guide blade pipe 9 and the leading pipe 6 Propells 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.

  As shown in FIG. 3, the gravel taking-in means 90 is a means for taking in gravel behind the front surface 39f of the board | substrate 25 which functions as a partition which partitions off the excavation earth and sand taking-in space 69a and the space 69b, A penetration through hole 91, a gravel taking-in space forming body 92, a gravel taking-in space volume varying means 93, and a suction means 94 are provided.

  The gravel taking-in through-hole 91 is configured by a through-hole that communicates the excavated earth and sand taking-in space 69a and the space 69b formed in the substrate 25 so as to penetrate through the front surface 39f and the rear surface 39 of the substrate 25. . For example, one or more gravel taking through holes 91 are provided on the lower edge 25x side of the substrate 25.

  The gravel uptake space forming body 92 is a space forming body provided on the rear surface 39 of the substrate 25 so as to communicate with the excavated earth and sand uptake space 69a through the through hole 91 for gravel uptake. It is formed by a cylindrical body having both ends opened and having the same inner diameter as the through hole 91 for insertion. Then, for example, one end opening end surface 92a of the cylinder of the grabbing space forming body 92 and the rear surface of the substrate 25 so that the one end opening of the cylinder of the gravel capturing space forming body 92 and the through hole 91 for gravel capturing coincide with each other. When both are fixed by fixing means such as welding in a state where they are in contact with 39, a gravel-capable space 95 capable of capturing gravel from the excavated soil-and-sand intake space 69a is formed.

For example, as shown in FIG. 3B, two corners on the lower edge 25x side of the rectangular substrate 25 are cut out to form a grab-taking through hole 91, and the corner of the rectangular cross section of the top tube 6 is formed. If the part 6g is used as a part of the grab-capturing space forming body 92, the material cost of the gravel-capturing space forming body 92 can be saved. That is, in this case, one long side edge of one long flat plate portion and the other long side edge of the other long flat plate portion are connected to each other to form one long flat plate portion and the other long flat plate portion. A long plate 92d having an L-shaped cross section with a right angle can be used. Then, the other long side edge of one long flat plate portion and the side inner surface 20x forming the inner surface 20 of the leading tube 6 are abutted, and one long side edge of the other long flat plate portion and the inner surface 20 of the leading tube 6 are matched. The rear surface of the substrate 25 corresponding to the edge of the notch portion of the through hole 91 for gravel intake and the one end surface 92b (see FIG. 3A) in the longitudinal direction of the long plate. 39, the abutted members are fixed to each other by fixing means such as welding to form a gravel-capable space 95, whereby the top pipe 6 is connected to the gravel-capturing space forming body 92. Since it can utilize as a part, the material cost of the space formation body 92 for gravel taking-in can be saved.
That is, the top tube 6 and the substrate 25 are formed in a rectangular shape, and a gravel intake through hole 91 is formed by cutting out two corners on the lower edge 25x side of the substrate 25, and a gravel capture box 99 described later is formed. It is formed by a box having a rectangular cross section surrounded by a long plate having an L-shaped cross section, a corner 6g of the rectangular cross section of the tube 6, and a movable partition wall 98 described later.

The gravel intake space volume varying means 93 includes, for example, a hydraulic cylinder device 97, a movable partition wall 98 provided at the tip of a piston rod 97a of the hydraulic cylinder device 97, and a control device 65 that controls the hydraulic pressure of the hydraulic cylinder device 97. Is provided. Reference numeral 97 b denotes a fixture for fixing the cylinder 97 c of the hydraulic cylinder device 97 to the leading pipe 6. A control line 65 a connects the control device 65 and the hydraulic cylinder device 97. In the figure, a configuration in which two hydraulic cylinder devices 97; 97 are provided in one movable partition wall 98 is illustrated, but one or more hydraulic cylinder devices 97 may be provided depending on the size of the movable partition wall 98. .
The movable partition wall 98 is formed of, for example, a plate having the same size as the cross-sectional shape surrounded by the inner peripheral surface of the gravel intake space forming body 92. On the outer peripheral surface of the plate constituting the movable partition wall 98, a watertight performance maintaining member such as packing (not shown) is provided so as to surround the outer peripheral surface. As the watertight performance maintaining member, for example, an annular member in which the inner peripheral side is mounted in a groove formed so as to go around the outer peripheral surface around the outer peripheral surface of the plate constituting the movable partition wall 98 is used. The movable partition wall 98 is arranged so that the central axis of the movable partition wall 98 coincides with the central axis of the cylinder of the gravel taking-in space forming body 92.
As described above, as the piston rod 97a moves back and forth, the movable partition wall 98 is maintained in a state where the water tightness between the outer peripheral surface of the movable partition wall 98 and the inner peripheral surface of the cylinder of the gravel-capturing space forming body 92 is maintained by the watertight performance maintaining member. Is configured to be able to move back and forth in the cylinder of the space forming body 92 for gravel intake.
Therefore, a gravel intake box 99 having a gravel intake space 99A defined by the inner peripheral surface 92e of the cylinder of the gravel intake space forming body 92 and the front surface 98a of the movable partition wall 98 is configured, and the piston rod 97a By moving back and forth, the volume of the gravel intake space 99A of the gravel intake box 99 can be changed.

The suction means 94 is a means for sucking the mud in the gravel capture box 99 to the outside of the gravel capture box 99, and is provided in the movable partition wall 98 so as to penetrate across the front surface 98 a and the rear surface 98 b of the movable partition wall 98. A suction through-hole 94a, a suction tube 94b, and a suction pump 94c are provided.
The suction through-hole 94a is provided with a fence 94d for preventing gravel intake. The suction through-hole 94a and one end opening of the suction pipe 94b are connected so as to communicate with each other, and the other end opening of the suction pipe 94b and the suction port of the suction pump 94c are connected so as to communicate with each other. The discharge port and the suction tank 76d are connected to each other by a connecting pipe 76f.

In other words, the pipe installation device 1 uses the excavating machine 26 to excavate the underground 10 and the gravel taking through hole 91 formed in the substrate 25 from the gravel that has entered the front pipe 6 in front of the substrate 25. And a gravel take-in box 99 that can be taken in rearward of the front surface 39f of the substrate 25. The gravel take-in box 99 is attached to the substrate 25 so as to communicate with the through-holes 91 for gravel take-in. The gravel-capturing space forming body 92 that forms a gravel-capable space 95 extending rearward from the front surface 39f of the gravel, and the gravel-collecting while maintaining the watertightness with the inner peripheral surface 92e of the gravel-capturing space-forming body 92 There is provided a movable partition wall 98 which is provided so as to be movable in the direction along the central axis of the leading pipe 6 and which serves as the rear end wall of the gravel taking-in box 99.
Further, the pipe installation device 1 is divided into an inner peripheral surface 92e of the gravel-capturing space forming body 92 and a front surface 98a of the movable partition wall 98 by moving the movable partition wall 98 in a direction along the central axis of the leading pipe 6. Gravel intake space volume variable means 93 for changing the volume of gravel intake space 99A in the gravel intake box 99 and suction for sucking mud soil in the gravel intake box 99 out of the gravel intake box 99 Means 94.

Next, with reference to FIG. 4, the installation method of the pipe | tube 2 to the underground 10 by the pipe installation apparatus 1 is demonstrated.
The substrate 25 to which the excavating machine 26, the propulsion force transmission rod 71, the water supply pipe 75 c and the mud pipe 76 b are attached 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 arranged 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. Accordingly, 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 6t side of the leading pipe 6 that is first inserted into the underground 10. Is done.
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 protruding rearward from the rear end surface 102e of the leading pipe 6. Further, the other end of the pressure hose 56 of the excavating machine 26 is connected to the hydraulic pressure source 55. Then, 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 pressing plate 64 provided at the tip of the retracted piston rod 63 is applied to the contact member 72. In the portion where the central axis of the leading pipe 6 is located.
Then, the pump 75d for water supply is driven to supply the muddy water into the excavated earth and sand taking-in space 69a, and the mud water is circulated between the excavated earth and sand taking-in space 69a and the collecting tank 75X. A portion where the central axis of the succeeding pipe 7 in the abutting member 72 is positioned by extending the piston rod 63 of the hydraulic jack 62 while supplying the pressure oil from the hydraulic source 55 to the hydraulic motor 47 by the control and rotating the rotary excavator 46. , The leading pipe 6 is propelled forward by the propulsive force transmitted to the leading pipe 6 via the propulsive force transmission device 70 and the ground excavation accompanying the rotation of the rotary excavating body 46, and the leading pipe 6 is in the ground 10 Installed. 65b is a control line for connecting the control device 65 and the hydraulic power source 55, and 65c is a control line for connecting the control device 65 and the hydraulic jack 62 (see FIG. 1).

After the leading pipe 6 is installed in the ground 10 leaving the trailing end face 102e of the leading pipe 6, as shown in FIG. 4B, the trailing pipe 7 is welded to the trailing end face 102e of the leading pipe 6 or a bolt. Further, as shown in FIG. 4C, the other end 71b of the leading propulsive force transmission rod 71 and one end 71a of the following propulsion transmission rod 71 are bolts, or By joining together by welding, the subsequent propulsive force transmission rod-shaped body 71 is added behind the leading propulsive force transmission rod-shaped body 71, and an extension pressure-resistant hose (not shown) is added to the other end of the pressure-resistant hose 56. An extension water supply pipe (not shown) is added to the other end of the supply pipe 75c, and an extension drainage pipe (not shown) is added to the other end of the mud discharge pipe 76b.
And as shown in FIG.4 (d), the contact material 72 is straddle | crossed between the other end 71b; 71b of the right-and-left propulsive force transmission rod-shaped body 71A; 71B which protrudes back from the rear-end edge of the succeeding pipe | tube 7. The rotary excavator 46 is excavated by driving the rotary excavator 46; 46 while pressing the piston rod 63 of the hydraulic jack 62 while the portion of the abutting member 72 where the center axis of the trailing pipe 7 is located. The leading pipe 6 is propelled while the following pipe 7 is installed in the ground.
In addition, the earth and sand excavated in the underground 10 by the rotary excavator 46; 46 are mixed with water in the excavated earth and sand intake space 69a to become muddy water and discharged to the mud tank 76d.
Thereafter, similarly, the support work 11 can be constructed by sequentially connecting the subsequent succeeding pipe 7 to the rear end edge of the preceding succeeding pipe 7 and installing it in the ground 10.

After the support work 11 is constructed, the excavating machine 26 is pulled back into the starting cavity 100 that is the starting point of excavation and collected. According to the first 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 back into the cavity 100 by the length and detaching the propelling force transmission rod 71 in order from the rearmost side to the front. In this case, the hydraulic jack 62, which is an example of the propulsion device 4, only needs to be installed in the cavity 100 as the excavation start point, so that the device cost can be reduced.
Note that the excavating machine 26 may be pushed into the cavity 100 on the reaching side and recovered.
For example, after extruding the leading pipe 6 to the reaching-side cavity 100 and removing the tube-side propulsive force receiving portion 21, the excavating machine 26, the substrate 25, and the propelling force transmission rod 71 are placed in the reaching-side cavity 100. Extrude and collect. In this case, the operation of pushing the excavating machine 26 into the cavity 100 on the reaching side is easier than the operation of pulling the excavating machine 26 back into the cavity 100 that is the starting point of excavation. It becomes easy.
As shown in FIG. 7B, when the support 11 is constructed so as to start from one cavity 100 formed in the underground 10 and return to the cavity 100, the excavating machine 26 has one cavity. If the excavation machine 26 is recovered by pushing it out of the arrival port into the cavity 100 when the arrival port of the part 100 is reached, the recovery operation of the excavation machine 26 is facilitated and the hydraulic jack 62 is Since it suffices to install only in the cavity 100, the apparatus cost can be reduced.

Next, the operation of the gravel taking-in means 90 will be described.
For example, before driving the excavating machine 26 and propelling the leading pipe 6, the propulsive force is transmitted from the front surface 98 a of the movable partition wall 98 to the pipe-side propulsive force receiving portion 21 via the watertight performance maintaining member 35. The gravel take-in space of the gravel take-in box 99 that is communicated with the excavated earth and sand take-in space 69a and extends rearward from the front face 39f of the substrate 25 by being positioned behind the front face 39f of the installed substrate 25. 99A is formed.
Then, as excavation proceeds, the excavated gravel moves into the gravel intake space 99A. In this case, the mud in the excavated earth and sand intake space 69a is sucked by the pump 76c for discharging mud through the mud pipe 76b, so that mud flows in the excavated earth and sand intake space 69a and gravel is taken in. It becomes easy to move into the gravel intake space 99A of the box 99, and mud soil in the gravel intake space 99A is sucked by the suction pump 94c, so that gravel can be efficiently taken into the gravel intake space 99A. become.
Then, if the gravel can not fully enter the gravel intake space 99A, the gravel enters the drainage pipe 76b connected to the pump 76c for draining mud and the amount of mud sucked by the pump 76c is reduced. When it is confirmed that the amount of mud has decreased, the piston rod 97a of the hydraulic cylinder device 97 is retracted and the movable partition wall 98 is moved backward to increase the volume of the gravel intake space 99A. The intake space 99A can be secured, and the gravel can be taken into the gravel intake space 99A. In this case, since the movable partition wall 98 is gradually moved rearward, the gravel is also easily moved rearward, so that the gravel accumulates in the gravel intake space 99A and takes the gravel into the gravel intake space 99A. This can prevent the situation from disappearing.
Thus, by providing the gravel taking-in means 90, gravel is inserted into the mud pipe 76b for draining the mud in the excavated earth and sand taking-in space 69a, and the gravel passes through the mud pipe 76b. It is possible to prevent a situation where the blockage occurs.
It should be noted that the relationship between the amount of water supply, the amount of mud and the amount of suction should theoretically be water supply = the amount of mud + the amount of suction. However, it is preferable to increase the water supply amount because it is easy to drain and suck.

  When using a long gravel-capturing space forming body 92 straddling the leading pipe 6 and the trailing pipe 7, the gravel-capturing space forming body 92 is connected before connecting the trailing pipe 7 to the rear end of the leading pipe 6. When attached to the substrate 25, the grab-capturing space forming body 92 is formed when the succeeding tube 7 is installed at the rear end of the leading tube 6 from above in the operation of connecting the trailing tube 7 to the trailing end of the leading tube 6. Since this is an obstacle, the rear pipe 7 must be moved from the rear side of the grab-capturing space forming body 92 to the rear end of the front pipe 6, and a space is required behind the front pipe 6, which makes the operation difficult. There is a possibility. Therefore, in this case, when the head pipe 6 is propelled while the through hole 91 for gravel intake is closed and the subsequent pipe 7 is connected to the rear end of the head pipe 6, The operation of opening the through hole 91 and the operation of connecting the gravel intake space forming body 92 to the rear surface 39 of the substrate 25 so that the gravel intake through hole 91 and the gravel intake space forming body 92 communicate with each other. It is preferable.

According to the first embodiment, since the gravel taking-in means 90 is provided, the gravel is taken into the gravel taking-in space 99A of the gravel taking-in box 99 even when the underground 10 is in the ground mixed with gravel, It is possible to suppress the gravel in the mud from accumulating in the mud pipe 76b, and the pipe can be smoothly pushed into the ground.
In addition, since the gravel intake space volume changing means 93 is provided, it is possible to prevent a situation in which gravel is accumulated in the gravel intake space 99A and cannot be taken into the gravel intake space 99A. Since the volume of the intake space 99A can be increased and a large amount of gravel can be taken into the gravel intake space 99A, it is possible to prevent the gravel in the mud from accumulating in the drainage pipe 76b for a long period of time. It will be possible to promote smoothly.
Further, since the suction means 94 is provided, it is possible to prevent a situation in which mud soil accumulates in the gravel intake space 99A of the gravel intake box 99 and the gravel cannot be taken in, and gravel intake in the gravel intake space 99A. Since the space can be secured, it is possible to prevent the gravel in the mud from accumulating in the mud pipe 76b for a long time, and the pipe can be smoothly pushed into the ground.
Further, by providing the gravel intake through hole 91 on the lower edge 25x side of the substrate 25, gravel is collected in the gravel capture box 99 by the momentum of the muddy water supplied into the excavated earth and sand intake space 69a. It becomes easy to be taken into the insertion space 99A.
Furthermore, two corners on the lower edge 25x side of the rectangular substrate 25 are cut out to form a gravel-incorporating through-hole 91, and an elongated plate having an L-shaped section and a corner section 6g of the rectangular section of the tube 6 are formed. Since the gravel intake box 99 is formed using the above, the material cost for forming the gravel intake box 99 can be saved, and the gravel flows due to the flow of the muddy water supplied into the excavated earth and sand intake space 69a. A gravel capture box 99 that is easy to be captured can be formed.
In addition, the larger the diameter of the mud pipe 76b, the better the mud efficiency, but in the first embodiment, since the gravel intake box 99 is provided, the entry of gravel into the mud pipe 76b can be reduced. The diameter of the mud drain pipe 76b can be increased, and the mud draining efficiency can be improved.

In addition, as the gravel taking-in means 90, it is good also as a structure which is not provided with any one of the gravel taking-in space volume variable means 93 and the suction means 94.
Moreover, as the gravel taking-in means 90, the gravel taking-in space volume variable means 93 and the suction means 94 are not provided, but the opening of the other end of the gravel taking-in space forming body 92 is closed to form the gravel taking-in box 99. It may be a configuration. In this case, mud soil may be filled in the gravel intake box 99 and the gravel may be less likely to be taken into the gravel intake box 99. Therefore, the gravel intake space 99A of the gravel intake box 99 is previously set. It is preferable to increase the volume of.
The gravel taking-in box 99 can take in gravel that has entered the excavated earth and sand taking-in space 69a to the rear side of the front surface 39f of the substrate 25 through the through hole 91 for gravel taking in the substrate 25. In this case, the gravel that has been taken in is accommodated so as not to leak into the space 69b inside the front pipe 6 behind the substrate 25.

  Moreover, 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 excavation body 46; 46 so that the rotary excavation body 46; 46 can excavate the inside of the open end 8 of the pipe 2. The rotary excavator 46 that rotates about the rotation center line that intersects the propulsion direction of the leading pipe 6 may be provided.

  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.

  The gravel taking-in means 90 in this invention is applicable also to the pipe installation apparatus provided with the rotary excavator etc. which make the center axis | shaft of the pipe | tube 2 a rotation center as a drilling machine.

2 pipes, 6 leading pipe (pipe), 7 following pipe (pipe), 10 underground, 20 inner surface of the leading pipe,
20a Inner peripheral surface of the top tube, 25 substrate, 26 excavating machine, 39f front surface of substrate,
69a Excavation earth and sand intake space, 76b Mud pipe,
90 gravel uptake means, 91 through hole for gravel uptake,
92 empty formation for gravel uptake, 92e inner peripheral surface of gravel uptake formation,
93 Gravel intake space volume variable means, 94 suction means, 95 gravel intake space,
98 Movable bulkhead, 98a Front of movable bulkhead, 99 Gravel capture box, 99A Gravel capture space,
100 Cavity, L Center of rotation.

Claims (5)

A tube, a substrate provided so as to be movable in the direction along the central axis of the tube while keeping water tightness with the inner peripheral surface of the tube, a drilling machine provided on the front surface of the substrate, a front surface of the substrate, and A water supply mechanism that supplies water into the excavated sediment collection space, which is the space surrounded by the inner surface of the pipe, and waste mud that discharges the excavated soil taken into the excavated sediment collection space to the outside of the excavated sediment collection space In a pipe installation device that installs a pipe into the ground from a hollow portion formed in the ground by propelling the pipe while excavating the ground located in front of the top of the pipe with a drilling machine,
By excavating the ground with a drilling machine, gravel that has entered the inside of the tube ahead of the substrate can be taken in and behind the front surface of the substrate through the grab-intake through hole formed in the substrate. A pipe installation device comprising a gravel take-in box for storing the gravel so that it does not leak into the inside of the pipe behind the substrate. The gravel capture box includes a gravel capture space forming body that is attached to the substrate so as to communicate with the gravel capture through-hole, and forms a gravel capture space that extends backward from the front surface of the substrate. It is provided so that it can move in the direction along the central axis of the pipe while keeping the water tightness with the inner peripheral surface of the space forming body, and it becomes the rear end wall of the gravel intake box A movable partition,
Further, by moving the movable partition wall in the direction along the central axis of the pipe, the gravel intake space in the gravel capture box defined by the inner peripheral surface of the gravel capture space forming body and the front surface of the movable partition wall is reduced. 2. The pipe installation device according to claim 1, further comprising a gravel taking-in space volume varying means for changing the volume.   The pipe installation device according to claim 1 or 2, further comprising suction means for sucking the gravel intake box.   The pipe installation device according to any one of claims 1 to 3, wherein the grab-taking through hole is formed on a lower side of the substrate.   The tube and the substrate are formed in a rectangular shape, the through hole for gravel intake is formed by cutting out the two corners on the lower edge side of the substrate, the gravel capture box is a long plate with an L-shaped cross section and the rectangular shape of the tube The tube installation device according to any one of claims 1 to 3, wherein the tube installation device is formed by a box having a rectangular cross section surrounded by a corner of the cross section.

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