JP5290668B2 - Prior material installation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method which enables a plurality of forepiling materials to be efficiently installed in natural ground ahead of a cutting face without use of an expensive drilling bit. <P>SOLUTION: In the method for installing the forepiling material, when the forepiling material is installed by being inserted in a direction crossing an internal wall surface toward the natural ground ahead of the cutting face from a boundary section between the cutting face of a tunnel cavity section and the internal wall surface of the tunnel cavity section, the plurality of forepiling materials are installed in such a manner as to be arranged at intervals in a direction along the circumferential direction of the inner wall surface of the tunnel cavity section in the boundary section. A device 1 for installing the forepiling material includes a pipe (outer pipe 2) as the forepiling material, and a push-in device 6 which pushes the pipe into the natural ground by bringing the cutting face into contact with a blade provided at the leading end of the pipe. Leading ends of the plurality of forepiling materials are positioned at intervals in a direction along the boundary section by means of the plurality of devices 1. After that, the plurality of forepiling materials are inserted in the direction crossing the inner wall surface toward the natural ground ahead of the cutting face from the boundary section. Thus, the plurality of forepiling materials are installed in such a manner as to be arranged at intervals in the direction along the circumferential direction of the inner wall surface of the tunnel cavity section. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a receiving material installation method capable of efficiently installing a plurality of receiving materials on a natural ground in front of a face without using a drill bit in tunnel excavation.

In tunnel excavation, after installing a perforated pipe as a receiving material with a through-hole penetrating the inner and outer surfaces of the pipe in a natural ground in front of the face, and around the perforated pipe through the perforated pipe There has been known a prior construction method in which a ground improvement agent is injected into a natural ground to prevent the prior settlement and loosening of the natural ground.
The perforated pipe is installed using a drilling device. The drilling device includes a drilling rod, a drilling bit provided at the tip of the drilling rod, and a rock drill for rotating and striking the drilling rod. The drilling rod is passed inside the perforated pipe, and the drilling bit excavates the natural ground by the rock drilling machine turning and hitting the drilling rod. In this case, after connecting the tip of the perforated pipe and the rear end of the drill bit to drill the ground with the drill bit and pulling the perforated pipe to install the perforated pipe in the ground A method of collecting a drilling rod and a method of excavating a natural ground with a drilling bit and pressing a rear end of the perforated pipe to install the perforated pipe in the natural ground and then recovering the drilling rod and the drilling bit Is known.
JP 2003-155888 A JP 2004-339837 A JP 2004-19359 A

However, the drill bit required for the perforated tube installation work in the prior art is expensive, and there is a problem that the construction cost becomes high. Moreover, since the hole for installing a perforated pipe | tube in a natural ground was formed one by one, there existed a problem that work efficiency was also bad.
The present invention provides a method in which a plurality of receiving materials can be efficiently installed on a natural ground in front of a face without using an expensive drill bit.

The receiving material installation method according to the present invention inserts a receiving material in a direction intersecting with the inner wall surface from the boundary with the inner wall surface of the tunnel cavity portion toward the ground in front of the cutting face in the face of the tunnel cavity portion. In the pre-receiving material installation method in which a plurality of pre-receiving materials are arranged side by side in the direction along the circumferential direction of the inner wall surface of the tunnel cavity at the boundary portion, the inner surface and the outer surface are penetrated. previously receiving material installation in which a plurality of through-holes of the tubes as previously receiving material and blade and the working face provided on the tip of this tube into contact with it and a pressing device to push the tube into the natural ground to Using a plurality of devices and a device mounting portion formed by a semi-cylindrical outer peripheral surface obtained by halving a cylinder or a semi-cylindrical outer peripheral surface obtained by halving a cylinder from which the apex side of a hollow cone is removed Te, circumferential direction of the outer peripheral surface on the outer peripheral surface of the mounting portion device a plurality of previously receiving material installation device Arranged at predetermined intervals along the, after positioning spaced a tip portion of a plurality of previously receiving material in the direction along the boundary portion, forward of the working face of the plurality of previous image receiving material from the boundary portion When a plurality of receiving materials are installed in a direction along the circumferential direction of the inner wall surface of the tunnel cavity so as to be lined up in a direction crossing the inner wall surface toward the natural ground, It is characterized in that the installation work of the prior receiving material was performed at the same time .
Also, an inner pipe is provided inside the pipe, and the inner pipe and the pipe are pushed together into the ground using the pushing device, and the injection pipe is used to perform the pushing operation from the rear end side of the pipe. It is also characterized by injecting water into the inside of the tip portion of the pipe through the space between the inner pipe and the pipe.
Further, the present invention is characterized by jetting water mixed with air as the water.
Using a multi-receiving material installation device that inserts and installs a plurality of receiving materials, the multi-receiving material installation device inserts and installs the receiving material for each receiving material. A receiving member installation device, and a circumferential positioning mechanism that moves the plurality of prior receiving device installation devices together in a direction along the circumferential direction of the inner wall surface of the tunnel cavity and positions them at a predetermined position. After positioning the plurality of receiving material setting devices at the first position by the positioning mechanism and inserting and installing the plurality of receiving materials by the plurality of receiving material setting devices, the circumferential positioning mechanism The plurality of receiving material installation devices are positioned at a second position where the plurality of receiving material installation devices are moved in a direction along the circumferential direction of the inner wall surface of the tunnel cavity from the first position. It is also characterized in that the work of inserting and installing a receiving material has been performed.

According to previously receiving material installation method according to the present invention, and a pressing device which is brought into contact with the blade and the working face provided on the distal end of the tube and those tube as previously receiving material by pushing the tube into the natural ground A device mounting formed by a plurality of receiving material installation devices and a semi-cylindrical outer peripheral surface obtained by halving the cylinder or a semi-cylindrical outer peripheral surface obtained by halving the cylinder from which the apex side of the hollow cone is removed. A plurality of pre-receiving material installation devices are arranged on the outer peripheral surface of the device mounting portion at a predetermined interval along the circumferential direction of the outer peripheral surface. After positioning the parts at intervals in the direction along the boundary part, the plurality of receiving materials are inserted in the direction intersecting the inner wall surface from the boundary part toward the natural ground ahead of the face. when installing the above receiving material so as to be aligned at intervals in the direction along the circumferential direction of the inner wall surface of the tunnel cavity, double Efficiency because the installation work of the previous image receiving material was carried out simultaneously, without the use of expensive drilling bits can reduce the cost of the previous image receiving material installation work, moreover, a plurality of previous image receiving material in front of the working face in the natural ground Can be installed efficiently and work efficiency is improved.
Also, an inner pipe is provided inside the pipe, and the pushing operation is performed to push the inner pipe and the pipe together into the ground using the pushing device, and the inner pipe and the pipe are connected from the rear end side of the pipe using the injection device. Since water is jetted to the inside of the tip portion of the pipe through the gap , a plurality of receiving materials can be efficiently installed in the ground in front of the face, and work efficiency is improved.
Moreover, since water mixed with air is injected as water, the amount of water can be reduced with the same injection force as compared with the case where air is not mixed. Since the earth and sand taken inside can be made into muddy water, the soil can be drained smoothly.
Since the multiple pre-receiving material installation device including the circumferential positioning mechanism that positions the multiple pre-receiving material installation devices at the first position and the second position is used, half the number of pipes installed at the boundary portion It is sufficient to use a number of receiving material installation devices of the same number, and the apparatus cost can be reduced as compared with the case of using a number of receiving material installation devices in accordance with the number of pipes installed at the boundary. Since the number of pipes twice as many as the number of material installation devices can be easily installed on the ground, work efficiency is improved.

Best Mode
1 to 9 show the best mode 1, FIG. 1 is an exploded perspective view of a receiving material installation device, FIG. 2 (a) is a sectional view of the receiving material installation device, and FIG. FIG. 3A shows a cross section taken along the line AA in FIG. 2A, FIG. 3A shows a pedestal, FIG. 3B shows a multiple pre-receiving material installation device, and FIG. 4A shows the pushing device and the circumferential direction. FIG. 4 (b) shows the pushing device and the circumferential positioning mechanism from the back side of the pushing device, and FIG. 5 (a) shows the multiple pre-receiving material installation device before angle setting from the side. 5 (b) shows a state in which the tip of the receiving material is positioned in the insertion hole, FIG. 6 (a) shows an enlarged view of the state in which the tip of the double tube is positioned in the insertion hole, FIG. 6 (b) shows a state in which the pipe is pushed into the ground and the discharging operation is performed, and FIGS. 7 (a) and 7 (b) show the circumferential positioning movement by the circumferential positioning mechanism. Are shown, FIG. 8 shows the pointing angle of the tube, Figure 9 shows a look at the installed tube natural ground from the boundary portion between the inner wall and the working face of a tunnel cavity from the wellhead side.

  As shown in FIG. 3B, the direction intersecting the inner wall surface 117 from the boundary 118 of the face 115 of the tunnel cavity 116 with the inner wall 117 of the tunnel cavity toward the natural ground 10 ahead of the face 115. The multi-receiving material installation device 150 that inserts and installs a plurality of elongate receiving materials is provided at intervals in the direction along the circumferential direction of the inner wall surface 117 of the tunnel cavity 116 at the boundary 118. A plurality of pre-receiving material installation devices 1 for performing an operation of inserting and installing a plurality of pre-receiving materials, a connecting member 152 for connecting the multiple pre-receiving material installation devices 1, and a circumferential positioning mechanism 153 are provided. .

  First, with reference to FIG. 1 thru | or FIG. 3, the structure of the receiving material installation 1 is demonstrated. As shown in FIG. 1, the receiving material installation device 1 includes an outer tube 2 as a tube, an inner tube 3, an injection device 4, a discharge device 5, and a pushing device 6. The outer tube 2 functions as a receiving material.

  The outer tube 2 is, for example, a long steel pipe 7 having a circular section of about 6 m to 15 m (hereinafter referred to as an outer long tube) and a distal end portion of the outer tube 2 provided at the distal end of the outer long tube 7. And a leading guide member 8. The outer long tube 7 includes a plurality of through holes 9 penetrating the inner surface and the outer surface of the tube. The through-hole 9 is used as a hole for supplying the ground improvement liquid to the ground around the outer pipe 2 installed in the ground 10. Although not shown, the through hole 9 is provided with a known check valve that is opened by the pressure of the ground improvement liquid only when the ground improvement liquid is supplied from the inside of the outer pipe 2 to the ground around the outer pipe 2. It is done.

  The leading guide member 8 is formed of a steel tubular body having a circular cross section, and includes a blade 11 at the tip of the tube and an attachment portion 12 at the rear end of the tube. The leading guide member 8 includes an inclined inner surface 13 of a cylinder that inclines in the direction of the rear end of the cylinder from the outer peripheral edge of the end of the cylinder that becomes the cutting edge 14, and the cutting edge 14 is an annular line that becomes the distal end of the inclined inner surface 13 of the cylinder. It is formed by a sharp edge (outer peripheral edge at the tip of the cylinder). That is, the blade 11 at the tip of the leading guide member 8 is formed by a ring-shaped sharp edge provided at one end of the cylinder.

  According to the above configuration, the distal end portion of the outer tube 2 is formed by the cylindrical leading guide member 8, and the leading end of the leading guide member 8 is formed on the sharp blade 11 by the ring-shaped sharp edge provided at one end of the tube. Since the outer surface of the cylinder of the leading guide member 8 is formed by the circumferential surface having the same diameter, the blade 11 of the outer tube 2 is moved when the outer tube 2 advances through the natural ground 10 along the insertion direction. After being pierced into the natural ground 10, the resistance when the outer tube 2 proceeds through the natural ground 10 along the insertion direction is reduced, and the outer tube 2 can be smoothly inserted into the natural ground 10. That is, since the blade 11 at the tip of the leading guide member 8 is formed by a ring-shaped sharp edge provided at one end of the cylinder, the earth and sand when the outer tube 2 advances through the natural ground 10 along the insertion direction. Since there are fewer surfaces perpendicular to the insertion direction that become a resistance by colliding with the outer tube 2, the resistance when the outer tube 2 travels along the ground 10 along the insertion direction is reduced, and the outer tube 2 is smoothly inserted into the ground. it can.

  As shown in FIGS. 2A and 2B, the outer diameter 15 of the tube of the leading guide member 8 is formed larger than the outer diameter 16 of the outer long tube 7. The attachment portion 12 of the leading guide member 8 includes a fitting hole 17 for fitting the distal end portion of the outer long tube 7. The fitting hole 17 is formed by a hole having a circular cross section provided so as to extend from the rear end surface 20 of the cylinder forming the leading guide member 8 toward the front end of the cylinder. The diameter 18 of the fitting hole 17 is smaller than the outer diameter 15 of the cylinder of the leading guide member 8 and larger than the inner diameter 19 of the cylinder of the leading guide member 8. The distal end of the outer long tube 7 is fitted into the fitting hole 17 so that the outer surface of the tube at the distal end of the outer long tube 7 and the inner wall surface of the hole of the fitting hole 17 are in contact with each other. The distal end portion of the long tube 7 and the attachment portion 12 of the leading guide member 8 are connected to each other by welding or the like. Thereby, the outer long tube 7 and the leading guide member 8 are provided coaxially, and the outer tube 2 is formed.

  According to the above configuration, in the state where the distal end portion of the outer long tube 7 is fitted into the fitting hole 17 and the outer long tube 7 and the leading guide member 8 are connected, the outer surface and the outer side of the leading guide member 8 are connected. Since the outer surface of the tube of the outer long tube 7 does not protrude outward from the outer surface of the tube of the leading guide member 8 at the boundary portion 21 with the outer surface of the long tube 7, the outer tube 2 is grounded along the insertion direction. As the outer pipe 2 travels along the insertion direction at the boundary portion 21, the resistance when the outer tube 2 travels along the insertion direction is reduced. The tube 2 can be smoothly inserted into the natural ground 10.

  The inner pipe 3 includes a long steel pipe 25 having a circular cross section (hereinafter referred to as an inner long pipe) and a steel outer pipe pressing member 26 attached to the outer peripheral surface of the distal end portion of the inner long pipe 25. . The outer tube pressing member 26 includes a mounting hole 27 and an injection nozzle 28. That is, the outer tube pressing member 26 includes a mounting hole 27 formed by a through hole having a circular cross section that penetrates the front end surface 35 and the rear end surface 49 of the circular plate at the center of the circular plate. A circular plate with a central hole provided with an injection nozzle 28 formed by a through-hole having a circular cross section that penetrates through the front end surface 35 and the rear end surface 49 of the circular plate. The outer diameter 29 of the circular plate forming the outer tube pressing member 26 is smaller than the inner diameter 23 of the outer long tube 7 of the outer tube 2 and is a cylinder connected to the hole bottom surface 30 of the fitting hole 17 of the leading guide member 8. It is larger than the diameter of the hole opening (that is, the inner diameter 19 of the cylinder of the leading guide member 8). The diameter 29 of the mounting hole 27 of the outer tube pressing member 26 is formed to have a dimension that allows the outer surface of the distal end portion of the inner long tube 25 to be inserted into the mounting hole 27. Then, the inner surface of the mounting hole 27 of the outer tube pressing member 26 is brought into contact with the outer surface of the distal end portion of the inner long tube 25 of the inner tube 3, or the inner surface of the mounting hole 27 of the outer tube pressing member 26 is contacted with In a state in which muddy water does not pass between the outer surface of the distal end portion of the inner long tube 25 of the inner tube 3, the outer tube pressing member 26 and the distal end portion of the inner long tube 25 are joined by welding or the like. . The distal end surface 35 of the outer tube pressing member 26 and the distal end surface 36 of the inner long tube 25 are coupled so as to be positioned on the same plane.

  According to the above configuration, when the inner tube 3 is installed by being inserted from the front end side of the inner tube 3 into the outer tube 2 via the rear end opening 37 of the outer tube 2, An annular pressing surface 40 is formed by the outer peripheral surface of the distal end surface 35, and the outer surface pressing member 26 is brought into contact with the pressing surface 40 and the bottom surface 30 of the fitting hole 17 of the leading guide member 8. The outer tube 2 is pressed in the insertion direction by being pressed by a pushing device 6 described later, and the pressing surface 40 is between the inner surface of the tube on the distal end side of the outer tube 2 and the outer surface of the tube on the distal end side of the inner long tube 25. The muddy water is prevented from entering between the inner surface of the outer tube 2 and the outer surface of the inner tube 3 (hereinafter referred to as the inner-outer tube 41) via the gap. That is, the inner side of the leading guide member 8 as the distal end portion of the outer tube 2 includes a hole bottom surface 30 as a pressed portion that is pressed by a pressing surface 40 as a pressing portion provided at the distal end of the inner tube 3. The inner tube 3 is installed inside the outer tube 2 so that the pressing surface 40 and the hole bottom surface 30 are in contact with each other, and the inner tube 3 is pressed by pushing the rear end of the inner tube 3 positioned behind the rear end of the outer tube. The pushing work which pushes the pipe | tube 3 and the outer pipe | tube 2 together into the natural ground 10 is performed.

  That is, the inner pipe 3 is installed inside the outer pipe 2 so that the outer pipe 2 can be pressed in the insertion direction into the natural ground 10, and muddy water does not pass between the inner and outer pipes 41 from the inner side of the leading guide member 8. It is configured to be surely discharged via the internal space 42 of the inner pipe 3. Further, by not allowing the muddy water to pass between the inner and outer pipes 41, it is possible to prevent a later-described water supply hose 51 installed in the inner and outer pipes 41 from being damaged by the muddy water.

  The injection device 4 is a device that injects pressurized water from the rear end opening 37 of the outer tube 2 through the inner and outer tubes 41 to the inside of the leading guide member 8 of the outer tube 2, And a water supply device 46. The water supply device 46 connects the water storage tank 47, the pressure pump 48, the water supply hose 51 that connects the injection nozzle 28 and the pressure pump 48, the hose guide 52, the pressure pump 48, and the water storage tank 47. And a water supply pipe 39.

The injection nozzle 28 formed on the outer tube pressing member 26 is provided between the outer surface at the distal end portion of the inner tube 3 and the inner surface at the distal end portion of the outer long tube 7, and from the rear end opening 37 of the outer tube 2. the inner surface of the leading guide member 8 of the cylinder was pressurized supplied via the inner and outer tubes between 41 water (e.g. 200Kg ^/ cm ² ~400Kg ^/ cm 2 about high pressure water) from the distal end side of the outer surface of the inner tube 3 53 is injected. The injection nozzle 28 may be formed by a through-hole formed with a constant cross-sectional diameter, or the cross-sectional diameter gradually decreases from the rear end surface 49 of the circular plate forming the outer tube pressing member 26 toward the front end surface 35. You may form with a through-hole. When the injection nozzle 28 is formed by a through-hole having a gradually decreasing cross-sectional diameter, it is preferable that the flow rate of water injected from the outlet of the injection nozzle 28 can be increased and the water pressure can be increased.

  According to the above configuration, the spray nozzle 28 can spray water along the inner surface 53 of the tube of the guide guide member 8 to the inside of the guide guide member 8 in front of the distal end surface 35 of the outer tube pressing member 26. Since the cutting device 6 is pushed into the natural ground 10 by the pushing device 6, it can collapse from the natural ground 10, move to the inside of the leading guide member 8, and reliably inject water into the taken earth and sand. Since the earth and sand inside the guide member 8 can be muddy water in which earth and sand and water are mixed, the soil can be discharged smoothly. That is, the discharge operation can be smoothly performed by the discharge device 5 described later.

  For example, when the long steel pipe 25 forming the inner pipe 3 is formed by adding a plurality of steel pipes 25a, the hose guide 52 is formed at each end of the pair of steel pipes 25a to be joined. The hose guide 52 is formed by four protrusions 52a that are formed at positions 90 ° apart from each other on the peripheral surface of the end of the steel pipe 25a to be joined. In a state where the one end surfaces of the four protrusions 52a of the hose guide 52 provided at the ends of the pair of steel pipes 25a; 25a are abutted so as to correspond to each other, the abutted protrusions 52a are in contact with these protrusions 52a. A pair of steel pipes 25a are joined by being connected by bolt-nut coupling by the formed bolt through-holes not shown, bolts 52b passing through these bolt through-holes, and nuts outside the figure fastened to the bolts 52b. That is, the hose guide 52 is configured to include four protrusions 52 a that protrude in a cross shape on the peripheral surface of the inner tube 3. Therefore, the water supply hose 51 is stabilized between the outer tube 2 and the inner tube 3 by passing the water supply hose 51 between the projections 52a adjacent to each other along the circumferential surface direction of the inner tube 3. Can be installed. Further, since the hose guide 52 has a cross-shaped cross section, when the inner tube 3 is pulled out from the outer tube 2 after the outer tube 2 is installed in the natural ground 10, the interference with the outer tube 2 can be reduced, and the hose guide 52 is pulled out. Work can be made easy.

  On the inner peripheral surface on the rear end side of the injection nozzle 28 formed on the screw portion (not shown) formed on the outer peripheral surface on the front end side of the fixture 60 fixed to the front end of the water supply hose 51 and the outer tube pressing member 26. The leading end portion of the water supply hose 51 is coupled to the rear end portion of the injection nozzle 28 by screw coupling with the formed screw portion outside the figure. The rear end of the water supply hose 51 and the discharge port of the pressure pump 48 are connected, and the suction port of the pressure pump 48 and the water outlet of the water storage tank 47 are connected by a water supply pipe 39.

  As shown in FIG. 2B, four sets of jetting structure sets including the jet nozzle 28 and the water supply hose 51 are provided, for example, 90 ° apart in the circumferential direction of the outer surface of the inner tube 3. Note that one or more injection structure sets may be provided. For example, two sets may be provided 180 degrees apart in the circumferential direction of the outer surface of the inner pipe 3, or three sets may be provided, for example, 120 degrees apart in the circumferential direction of the outer surface of the inner pipe 3, or four or more sets may be provided. Good.

  According to the above configuration, the water from the water storage tank 47 is pressurized by the pressure pump 48 and then sprayed to the inside of the leading guide member 8 through the water supply hose 51 and the spray nozzle 28.

  The discharge device 5 is a device that sucks muddy water from the inside of the tube of the leading guide member 8 via the internal space 42 of the inner pipe 3, and includes a discharge path 64, a suction pump 65, a storage tank 63, and a discharge path 64. Are provided with a suction pipe 68 that connects the discharge port 67 and the suction pump 65 located at the end of the suction pipe 65, and a connection pipe 69 that connects the suction pump 65 and the storage tank 63. The discharge path 64 is formed by a cylindrical internal space 59 of the leading guide member 8 and an internal space 42 of the inner tube. The discharge port 67 is provided at the rear end portion of the inner long tube 25 of the inner tube 3. As shown in FIG. 1, the discharge port 67 is formed by a suction tube connecting portion penetrating the inner surface and the outer surface of the tube of the inner tube 3, or as shown in FIG. 2, the rear end opening of the inner tube 3 is opened. It is formed by the pipe side connection port 202 of the suction connection member 200 connected to the pipe. The discharge port 67 and the suction port of the suction pump 65 are connected by a suction pipe 68. The discharge port of the suction pump 65 and the intake port of the storage tank 63 are connected by a connecting pipe 69. The suction connection member 200 is formed by a connection pipe in which a rear end portion is closed and a pipe side connection port 202 connected to a rear end opening of the inner tube 3 and a suction pipe connection port 201 are communicated by an L-shaped flow path. Is done. An outer peripheral surface of the rear end portion of the inner tube 3 and an outer periphery of the packing 203 are interposed between the rear end opening end surface of the inner tube 3 and the tube-side connection port end surface of the suction connection member 200 so as to close the space therebetween. The inner tube 3 and the suction connection member 200 are connected by a connecting member 204 that covers the surface and the outer peripheral surface of the pipe-side connection portion of the suction connection member 200. Although not shown in the drawings, the connecting member 204 is formed by two halved members obtained by halving the cylindrical body, and two halved members are provided with joint flanges formed with bolt through holes at both ends of the halved member. When the outer peripheral surfaces of the inner tube 3 and the suction connection member 200 are clamped, the inner flange 3 and the suction connection member 200 are connected by fastening the joint flanges that are attached to each other with bolts and nuts.

  According to the above configuration, the muddy water is sucked into the suction pump 65 from the inside of the tube of the leading guide member 8 via the discharge path 64, the discharge port 67, and the suction pipe 68 by the suction force of the suction pump 65, It is sent to the storage tank 63.

  The inner pipe 3 equipped with the injection nozzle 28, the hose guide 52, and the water supply hose 51 is installed inside the outer pipe 2 to form a double pipe 70. In the double tube 70, the rear end portion of the inner tube 3 is connected to the outer tube in a state where the front end surface of the outer tube pressing member 26 of the inner tube 3 is in contact with the bottom surface 30 of the fitting hole 17 of the leading guide member 8. 2 is formed so as to be located behind the rear end. The discharge port 67 is provided at the rear end portion of the inner tube 3 located behind the rear end of the outer tube 2. Then, the inner pipe 3 is pressed by pressing the rear end of the inner pipe 3 positioned behind the rear end of the outer pipe 2 or the rear end of the suction connection member connected to the rear end opening of the inner pipe 3 by the pushing device 6. The outer tube 2 and the outer tube 2 are pushed together into the ground 10 to perform the pushing operation described later. If the rear end of the suction connection member 200 connected to the rear end opening of the inner tube 3 is pressed by the pushing device 6, the rear end of the inner tube 3 is prevented from being crushed compared to the case where the inner tube 3 is pushed directly by the pushing device 6. it can.

  In the state where the front end surface of the outer tube pressing member 26 and the hole bottom surface 30 of the fitting hole 17 of the leading guide member 8 are in contact with each other, the rear end portion of the inner tube 3 is located outside the rear end of the outer tube 2. When located inside the pipe 2, it is necessary to provide the suction pipe 68 between the inner and outer pipes 41, or to provide an opening in the outer pipe 2 in order to connect the discharge port 67 and the suction pipe 68. 2, the rear end surface 71 of the inner tube 3 positioned inside the inner tube 2 is pressed by a pressing surface 99 of the pushing device 6 to be described later, so that the pressing surface 99 interferes with the water supply hose 51 and the suction tube 68 to inject and discharge. There is also a possibility that it will interfere. On the other hand, the rear end portion of the inner tube 3 is located behind the rear end of the outer tube 2 in a state where the front end surface of the outer tube pressing member 26 and the hole bottom surface 30 of the fitting hole 17 of the leading guide member 8 are in contact with each other. The inner tube 3 and the outer tube 2 are pushed together into the ground 10 by pressing the rear end of the inner tube 3 positioned rearward of the rear end of the outer tube 2. In the case of the configuration, it is not necessary to provide the suction pipe 68 between the inner and outer pipes 41, or to provide an opening in the outer pipe 2 in order to connect the discharge port 67 and the suction pipe 68, and the pressing surface 99 and the water supply Interference with the hose 51 and the suction pipe 68 can be eliminated, and smooth pushing, injection, and soil removal can be performed.

  The pushing device 6 is a device that pushes the outer tube 2 into the natural ground 10 and includes an angle setting device 80 and a pressing device 90. The angle setting device 80 includes a stepping motor 82, a rack 83, and a control device 81 (see FIG. 4) that controls the stepping motor 82. The rack 83 is provided so as to extend in the direction in which the outer tube 2 is inserted into the natural ground 10. A shaft connecting portion 84 is provided at the rear end portion in the extending direction of the rack 83. A shaft connecting hole 85 is provided in the shaft connecting portion 84. The shaft coupling hole 85 (see FIG. 16) has a hole center line parallel to the upper surface (tooth surface) 86 of the rack 83 and orthogonal to the extending direction of the rack 83. A rotating shaft 87 (motor shaft or a shaft connected to the motor shaft) is passed through the shaft connecting hole 85 so that the rotating shaft 87 and the rack 83 can rotate together with the axis of the rotating shaft 87 as the center of rotation. Further, the shaft connecting hole 85 and the rotating shaft 87 are coupled by a key 89. On the rack 83, a double tube body 70 including the outer tube 2 and the inner tube 3 is placed.

  As shown in FIGS. 4 and 12, the pressing device 90 rotates the pinion 91 and the rack 83, the pinion 91 that meshes with the teeth 33 of the rack 83 and can reciprocate in the extending direction of the rack 83. The motor 92 to drive, the control apparatus 93 which controls the motor 92, and the press body 94 provided so that the reciprocation of the rack 83 was possible along with the reciprocation of the pinion 91 were provided. A shaft coupling hole 95 formed at the center of the pinion 91 and a rotating shaft 96 (a motor shaft or a shaft coupled to the motor shaft) are coupled by a key 34. A casing 97 of the motor 92 is attached to the motor attachment plate 98. The motor mounting plate 98 and the pressing body 94 are connected and coupled. The pressing body 94 includes a pressing surface 99 and a holding body 100. The pressing surface 99 comes into contact with the rear end surface 71 of the inner tube 3 of the double tubular body 70 placed on the rack 83 and presses the rear end surface 71. The holding body 100 includes an outer surface that protrudes from the pressing surface 99 and comes into contact with the inner surface of the inner tube 3 from the rear end opening 31 of the inner tube 3 of the double tube 70 placed on the rack 83. It is formed by a cylindrical body (or a cylindrical body). The pressing surface 99 is formed by a surface orthogonal to the extending direction of the rack 83, and the holding body 100 is provided so that the central axis of the cylindrical body is orthogonal to the pressing surface 99. Since the holding body 100 is provided, the central axis of the inner tube 3 and the central axis of the holding body 100 are held in a state of being coincident and the entire rear end surface 71 of the inner tube 3 is pressed by the pressing surface 99. The pressing force can be reliably transmitted to the rear end surface 71 without the positional displacement of the surface 99 and the rear end surface 71.

  4; FIG. 16, the casing 105 of the stepping motor 82, the bearing 106 that rotatably supports the rotating shaft 87, the control device 81 of the stepping motor 82, and the control device 93 of the motor 92 are based on a base 110. Fixed to. The rack 83 is provided with the lower surface 111 floating above the base surface 112 so as to be rotatable about the axis of the rotation shaft 87 as a rotation center. A support surface 113 that supports the lower surface 111 on the front end side of the rack 83 is provided on the front end side of the base 110. The support surface 113 is arranged so that the upper surface 86 of the rack 83 on which the double tubular body 70 is placed is positioned in a horizontal plane, or the upper surface on the front end side of the rack 83 is higher than the upper surface on the rear end side of the rack 83. The bottom surface of the rack 83 is supported so as to be positioned. The base 110 is installed on the upper surface 160 of a base 154 described later so that the rack 83 extends in the insertion direction of the outer tube 2 into the ground 10.

  According to the above configuration, the double pipe body 70 is placed on the rack 83, the rear end portion of the inner pipe 3 of the double pipe body 70 is held by the holding body 100, and By driving the stepping motor 82 with the rear end surface 71 of the tube 3 in contact, the insertion angle of the double tube 70 into the ground 10 can be adjusted, and by driving the motor 92, The double tube 70 can be moved forward. In other words, the angle setting device 80 using the stepping motor can perform the angle holding operation for holding the outer tube 2 at the insertion angle to the natural ground 10 and the insertion angle can be finely adjusted. improves. Further, the outer tube 2 can be easily installed on the natural ground 10 by the pressing device 90 having a simple configuration including the motor 92, the rack 83, and the pinion 91.

  As shown in FIG. 3B, the circumferential direction positioning mechanism 153 includes a gantry 154, a circumferential direction movement guide rail 155, and a circumferential direction movement mechanism 156.

  3A; As shown in FIG. 8, the gantry 154 includes an apparatus placement portion 162, a support portion 157, and an excavation direction moving mechanism 158. The device mounting portion 162 is formed in a substantially semi-cylindrical shape, such as a half of a cylinder, so that the direction along the axis of the semi-cylinder is the same as the digging direction, and the outer peripheral surface faces upward. Installed. That is, the upper surface 160 (see FIG. 10) is formed by the outer peripheral surface of the half cylinder, and the lower surface 161 is formed by the inner peripheral surface of the half cylinder. The support portion 157 is formed of a steel frame structure that is connected to the lower surface 161 of the device placement portion 162 and supports the device placement portion 162. The excavation direction moving mechanism 158 includes a rail 165 installed on the bottom surface 187 of the tunnel cavity 116 so as to extend from the wellhead 186 (see FIG. 5) side to the face 115 side, and a rail 165 provided at the lower end of the support portion 157. Formed by wheels 166 traveling above.

  As shown in FIG. 3 (b); FIG. 5; FIG. 7, the plurality of receiving material installation devices 1 are arranged around the upper surface 160 of the device mounting portion 162 on a plane parallel to the upper surface 160 of the device mounting portion 162. The lower surfaces 163 of the bases 110 of the plurality of receiving material installation apparatuses 1 extend in parallel along the circumferential direction of the upper surface 160 of the apparatus mounting portion 162. By being connected by the formed connecting member 152, the device connecting body 167 is formed.

  As shown in FIG. 3 (a); FIG. 4 (a), the circumferential movement guide rail 155 extends along the circumferential direction of the upper surface 160 of the device mounting portion 162 so that the upper surface 160 of the device mounting portion 162 is extended. Attached to. The circumferential movement guide rail 155 includes a derailing restricting portion 155b that is formed in a concave shape in cross section and prevents the derailment of a wheel 159, which will be described later, positioned so as to slide in the concavity 155a.

  As shown in FIG. 3 (b); FIG. 4, the circumferential movement mechanism 156 is a wheel that is attached to the lower surface 163 of the base 110 of each receiving material installation device 1 and can travel in the circumferential movement guide rail 155. 159 and a gear drive mechanism 168. The gear drive mechanism 168 includes an internal gear 170 attached to the lower surface 169 of the connecting member 152 so as to extend along the circumferential direction of the upper surface 160 of the device mounting portion 162, a drive gear 171 that meshes with the internal gear 170, A stepping motor 172 that drives the drive gear 171 and a circumferential movement control device 173 that controls the stepping motor 172 are provided.

  Next, an installation method will be described. A plurality of bases 110 are connected by a connecting member 152 and arranged at a predetermined interval along the circumferential direction of the upper surface 160 of the device mounting portion 162, and the angle setting device 80 sets an angle with respect to each base 110. The double pipe body 70 is installed on the upper surfaces 86 of the plurality of racks 83, and the injection device 4 and the earth and sand unloading device 5 are connected to the inner tube 3, thereby constructing a multi-receiving material installation device. Also, as shown in FIG. 3A, an insertion hole 119 is formed in the face 115 as a mark for inserting the distal end portion 180 of the outer tube 2. That is, before performing the pushing operation, concrete is sprayed onto the face 115 to form a sprayed concrete layer (not shown) on the face 115, and the distal end portion 180 of each outer pipe 2 of the multiple pre-receiving material installation device 150 is formed on this sprayed concrete layer. A plurality of insertion holes 119 are formed as marks for inserting the. Thus, by forming the insertion hole 119 for inserting the distal end portion 180 of the outer tube 2 in the face 115, the positioning operation of the distal end portion 180 of the outer tube 2 can be facilitated. As shown in FIG. 9, the insertion holes 119 are formed at predetermined intervals (for example, 45 cm) along the circumferential direction of the inner wall surface 117 at the boundary portion 118 of the face 115 of the tunnel cavity portion 116 with the inner wall surface 117 of the tunnel cavity portion 116. As many as twice as many as the number of the receiving material installation devices 1 are formed with a distance of about 50 cm). The center 175 of the arc 174 connecting the centers of the plurality of insertion holes 119 formed at the boundary portion 118 between the face 115 and the inner wall surface 117 and the center of the insertion hole 119 formed at the right end in the circumferential direction at the boundary portion 118. The angle α formed by the right end line to be connected and the left end line connecting the center 175 of the arc 174 connecting the centers of the plurality of insertion holes 119 and the center of the insertion hole 119 formed at the left end in the circumferential direction at the boundary 118 is 120 °. Formed to a degree. In this case, an angle β1 formed between the straight line connecting the center 175 of the arc 174 and the center of the insertion hole 119 and the straight line adjacent to each other is about 8 °.

  Then, as shown in FIG. 5; FIG. 3 (b), the work of moving the gantry 154 to the face 115 side and the inner pipe pressing work by the pressing device 90 of each receiving material installation device 1 are performed. The distal end portion 180 of the outer tube 2 is inserted into the corresponding insertion hole 119. In this case, the distal end portion 180 of the outer pipe 2 installed by one receiving material installation device 1 located at either the circumferential left or right end of the gantry 154 is located at either the circumferential left or right end of the boundary portion 118. It is inserted into one insertion hole 119. That is, a positioning operation for positioning the distal end portion 180 of each outer tube 2 installed in each receiving material installation apparatus 1 is performed. At this time, the distal end portion 180 of the outer tube 2 of each of the pre-receiving material installation devices 1 is adjacent to the insertion hole 119 row formed so as to be aligned along the circumferential direction of the boundary portion 118. It is inserted into the insertion hole 119.

  For example, in FIG. 9, when the centers of the plurality of insertion holes 119 formed in the face 115 are connected to the center 175 of the arc 174 and the center of each insertion hole 119 by a line, the lines are adjacent to each other. For example, the angle β1 is 8 °, and the angle β2 formed by two straight lines connecting the center of two insertion holes 119 adjacent to each other with one insertion hole 119 and the center 175 of the arc 174 is 16 °. For example, the angle formed by the insertion hole 119 at the right end of the face 115 (the right end when the face 115 is viewed from the wellhead 186 side) and the straight line connecting the center of the right end insertion hole 119 and the center 175 of the arc 174 is An insertion hole whose center is located on a straight line whose angle formed by the insertion hole 119 whose center is located on a straight line of 16 ° and the straight line connecting the center of the insertion hole 119 at the right end and the center 175 of the arc 174 is 32 ° 11 And an insertion hole 119 whose center is located on a straight line whose angle between the center of the right end insertion hole 119 and the center 175 of the arc 174 is 48 °, and the center and arc of the right end insertion hole 119 An angle formed by an insertion hole 119 whose center is located on a straight line having a 64 ° angle with the straight line connecting the center 175 of 174 and a straight line connecting the center of the rightmost insertion hole 119 and the center 175 of the arc 174. Is centered on a straight line having an angle of 96 ° between the insertion hole 119 whose center is located on a straight line of 80 ° and the straight line connecting the center of the rightmost insertion hole 119 and the center 175 of the arc 174. The insertion holes 119 and the insertion holes 119 whose centers are located on a straight line having an angle of 112 ° formed by the straight line connecting the center of the insertion hole 119 at the right end and the center 175 of the arc 174 are respectively inserted into the insertion holes 119. One two Multiple destination receiving material installation apparatus 150 can be inserted the tip portion 180 of the tubular body 70 may be used.

That is, the multi-receiving material installation device 150 that can install the eight double pipe bodies 70 together in the natural ground 10 at a time may be used. And after inserting the front-end | tip part 180 of the some double pipe body 70 in the some insertion hole 119, a plurality of double pipe bodies 70 are pushed in into the natural ground 10 by performing pushing operation | work and discharge | emission work. In other words, a plurality of double tubes 70 are installed in the natural ground 10 (see FIG. 7A). That is, the pressing device 90 of the pressing device 6 is driven to perform the pressing operation, and the discharging operation by the discharging device 5 is performed. In this discharge operation, after confirming that the earth and sand are sucked by the suction pump 65, or while confirming, the injection device 4 performs the injection operation, and thereafter, the pushing operation, the discharge operation, and the injection operation are continued. Thus, since the muddy water inside the leading guide member 8 is sucked and discharged by the discharge device 5 while the double tube 70 is pushed by the pressing device 90, the double tube 70 is discharged. It is pushed into the natural ground 10 smoothly, inserted into the natural ground 10, and installed in the natural ground 10.
The injection operation is performed by setting conditions such as the amount of water and water pressure so that the water flows only inside the leading guide member 8 and does not reach the natural ground 10 ahead of the cutting edge 14 of the leading guide member 8. Do. After the double pipe 70 is installed in the natural ground 10, the pinion 91 is moved to the rear end side of the rack 83, and the inner pipe 3 is pulled out from the inner side of the outer pipe 2 to the tunnel cavity 116. As described above, the plurality of outer pipes 2 are installed in the natural ground 10.

After attaching a new outer tube 2 to each inner tube 3 and constructing a plurality of receiving material installation devices 1 again, the stepping motor 172 is activated to drive the drive gear 171, thereby connecting the device coupling body 167. It is moved along the circumferential direction of the upper surface 160 of the gantry 154. For example, when eight outer pipes 2 are installed as described above, the stepper motor 172 is controlled to change the device coupling body 167 from the state shown in FIG. 7A to the state shown in FIG. It is moved 8 degrees in the left rotation direction. And the operation | work which moves the mount frame 154 to the face 115 side, and the inner tube | pipe pressing operation | work by the press device 90 of each tip receiving material installation apparatus 1 are carried out, and the front-end | tip part 180 of the some outer tube | pipe 2 is each corresponding remaining. It becomes possible to insert into the insertion hole 119. After inserting the distal end portions 180 of the plurality of outer tubes 2 into the insertion hole 119, the double tube 70 is pushed into the ground 10 by performing the pushing operation and the discharging operation. Is installed in the natural ground 10 (see FIG. 7B). Thereafter, the pinion 91 is moved to the rear end side of the rack 83, and the inner tube 3 is pulled out from the inside of the outer tube 2 to the tunnel cavity 116. As described above, for example, as shown in FIG. 9 with white and black, it is possible to install a total of 16 outer pipes 2 divided into 8 pieces twice.
Note that the angles α; β1; β2 are set to appropriate values according to the size of the tunnel cross section, natural ground properties, and the like. For example, when about 30 outer tubes 2 are installed in the natural ground 10 along the boundary 118, the angle β1 is about 4 °. Further, the outer tube 2 is installed along the boundary portion 118 at equal intervals.
Then, by injecting the ground improvement liquid directly into the outer pipe 2 from the rear end opening 37 of the outer pipe 2 installed in the ground 10 or using a packer, the ground improvement liquid passes through the through-hole 9 of the outer pipe 2. It penetrates into the ground around the outer pipe 2 via, thereby improving the ground around the outer pipe 2. Thereafter, the face 115 is excavated with an excavator not shown.

  That is, by using the circumferential positioning mechanism 153, a plurality of (e.g., eight) receiving material placement devices 1 are moved together in the direction along the circumferential direction of the inner wall surface 117 of the tunnel cavity 116, so that a plurality of tips are installed. The receiving material installation apparatus 1 is moved to a first position 181 (see FIG. 7A) and a direction along the circumferential direction of the inner wall surface 117 of the tunnel cavity 116 from the first position 181. Position to position 182 (see FIG. 7B).

According to the best mode 1, without using an expensive drill bit, the face 118 of the tunnel cavity 116 is directed from the boundary 118 with the inner wall surface 117 of the tunnel cavity 116 to the ground 10 in front of the face 115. Since the outer tube 2 can be installed in the natural ground 10 by inserting a plurality of outer tubes 2 as long tip receiving materials in the direction intersecting the inner wall surface 117, the cost of the receiving material installation work can be reduced. In particular, by performing the pushing operation and the discharging operation, a plurality of outer pipes 2 can be installed at the same time, so that work efficiency is improved. Moreover, since the circumferential direction positioning mechanism 153 is provided, the number of outer tubes 2 that is twice as many as the number of the receiving material installation devices 1 can be easily installed in the natural ground 10, so that the work efficiency is improved. In other words, since the number of receiving material installation devices 1 that is half the number of outer pipes 2 installed at the boundary 118 may be used, the number of receiving materials corresponding to the number of outer tubes 2 installed at the boundary 118 is used. Compared with the case of configuring the multiple pre-receiving material installation device 150 including the installation device 1 (see FIG. 15), the device cost can be reduced, and the number of the pre-receiving material installation devices 1 is twice the number. The tube 2 can be easily installed on the natural ground 10.
Further, according to the best mode 1, conditions such as the amount of water and water pressure prevent water from flowing only inside the leading guide member 8 and not reaching the natural ground 10 ahead of the cutting edge 14 of the leading guide member 8. Therefore, the amount of suction water in the discharge operation can be reduced and the earth and sand taken inside the leading guide member 8 can be made muddy water, so that the soil can be discharged smoothly. Further, when water reaches the natural ground 10 ahead of the cutting edge 14 of the leading guide member 8, a hole is excavated in the natural ground ahead of the cutting edge 14 of the leading guide member 8 without the outer pipe 2, There is a problem in that a hole having a diameter larger than the pipe diameter of the leading guide member 8 is dug around the guide member 8, and the hole portion collapses and the ground above the hole portion causes ground subsidence. End up. Further, when water penetrates into the natural ground 10 ahead of the cutting edge 14 of the leading guide member 8 and time elapses, the natural ground 10 becomes hard and the double tube 70 is smoothly pushed into the natural ground 10. The problem of not being able to occur will also arise. On the other hand, according to the best mode 1, water is prevented from reaching the natural ground 10 in front of the cutting edge 14 of the leading guide member 8, so that the above-described problem can be solved.

Best Mode 2
A gantry 154 provided with a device mounting portion 162 as shown in FIG. 10 may be used as the device mounting portion 162 of the gantry 154. The upper surface 160 of the apparatus mounting portion 162 is formed by a part of a conical circumferential surface in which the wellhead 186 side is the apex side and the face 115 side is the bottom surface side. The part of the peripheral surface means, for example, a surface in a range of about 180 ° in the circumferential direction excluding the side close to the apex of the conical peripheral surface. The lower surface 161 of the device mounting part 162 is formed by a peripheral surface parallel to the upper surface 160 of the device mounting part 162. That is, the device mounting portion 162 is formed in a semi-cylindrical shape in which the cylinder from which the apex side of the hollow cone having the conical hollow portion is removed on the inner side of the outer peripheral surface of the cone is cut in half, and along the axis of the half cylinder. And the excavation direction are the same, and the outer circumferential surface faces upward. An upper surface 160 is formed by the outer peripheral surface of the half cylinder, and a lower surface 161 is formed by the inner peripheral surface of the half cylinder. The upper surface 160 of the device mounting portion 162 is formed by an outer peripheral surface of a cylinder whose diameter increases from the wellhead 186 side toward the face 115 side, and is directed from the wellhead 186 side toward the face 115 side with respect to the central axis of the cylinder. The inclination angle of the upper surface 160 that is inclined is formed at the same angle as the insertion angle of the outer tube 2 into the ground 10.

  As shown in FIG. 14, the plurality of receiving material installation devices 1 are spaced apart from each other at a predetermined interval along the circumferential direction of the upper surface 160 of the device mounting portion 162 on a plane parallel to the upper surface 160 of the device mounting portion 162. The lower surfaces 111 of the racks 83 of the plurality of receiving material installation devices 1 are connected by a connecting member 152 formed to extend in parallel along the circumferential direction of the upper surface 160 of the device mounting portion 162. Thus, the device coupling body 167 is formed. As shown in FIG. 12, the circumferential movement mechanism 156 includes wheels 159 that are attached to the lower surface 111 of the rack 83 of each receiving member installation device 1 and can travel in the circumferential movement guide rail 155. Other configurations, that is, the support portion 157 of the gantry 154, the excavation direction moving mechanism 158, the circumferential direction moving guide rail 155, and the gear drive mechanism 168 are the same as those of the best mode 1 (see FIGS. 10 and 12).

  Next, an installation method will be described. The double tubular body 70 is installed on the upper surface 86 of a plurality of racks 83 that are connected by the connecting member 152 and arranged at predetermined intervals along the circumferential direction of the upper surface 160 of the apparatus mounting portion 162. By connecting the injection device 4 and the discharge device 5, a multi-first receiving material installation device 150 is constructed. In addition, as in the best mode 1, a plurality of insertion holes 119 are formed (see FIG. 10), and as shown in FIG. By performing the inner tube pressing operation by the pressing device 90 of the material installation device 1 and inserting the distal end portions 180 of the plurality of outer tubes 2 into the corresponding insertion holes 119, respectively, the above-described pressing operation and discharging operation are performed. The plurality of double pipes 70 are pushed into the natural ground 10, and the double pipes 70 are installed in the natural ground 10 (see FIG. 14A). Thereafter, the pinion 91 is moved to the rear end side of the rack 83, and the inner tube 3 is pulled out from the inside of the outer tube 2 to the tunnel cavity 116. As described above, the plurality of outer pipes 2 are installed in the natural ground 10. Then, after attaching a new outer tube 2 to each inner tube 3 and reconstructing the plurality of pre-receiving material installation devices 1, the stepping motor 172 is activated to drive the drive gear 171, thereby connecting the devices. 167 is moved along the circumferential direction of the upper surface 160 of the gantry 154. And the operation | work which moves the mount frame 154 to the face 115 side, and the inner tube | pipe pressing operation | work by the press device 90 of each tip receiving material installation apparatus 1 are carried out, and the front-end | tip part 180 of the some outer tube | pipe 2 is each corresponding remaining. After inserting into the insertion hole 119, by performing the pushing operation and the discharging operation described above, a plurality of double pipe bodies 70 are pushed into the natural ground 10, and the double tubular bodies 70 are installed in the natural ground 10. (See FIG. 14B). Thereafter, the pinion 91 is moved to the rear end side of the rack 83, and the inner tube 3 is pulled out from the inside of the outer tube 2 to the tunnel cavity 116. As described above, in the same manner as in the best mode 1, for example, a total of 16 outer pipes can be installed by dividing 8 parts into 2 parts.

  According to the best mode 2, the same effect as that of the best mode 1 can be obtained, and the angle setting device 80 of the best mode 1 is not necessary, and the entire device can be made inexpensive.

Best Mode 3
As shown in FIGS. 15 (a) and 15 (b), the number of receiving materials that are installed in a predetermined number at intervals in the direction along the circumferential direction of the inner wall surface 117 of the tunnel cavity 116 at the boundary 118. It is good also as the multiple receiving material installation apparatus 150 provided with the mount frame 154 carrying the several receiving material installation apparatus 1 of the number corresponding to these.

Best Mode 4
A pushing device 6a as shown in FIG. 16 may be used. The pushing device 6 a includes an angle setting device 80 and a pressing device 102. In the case of this embodiment, the angle setting device 80 includes a stepping motor 82, a mounting table 125, and a control device 81 that controls the stepping motor 82. The mounting table 125 is provided so as to extend in the direction in which the outer tube 2 is inserted into the ground 10. A shaft connecting portion 84 is provided at the rear end portion in the extending direction of the mounting table 125. A shaft connecting hole 85 is provided in the shaft connecting portion 84. The shaft coupling hole 85 has a hole center line parallel to the upper surface 123 of the mounting table 125 and orthogonal to the extending direction of the mounting table 125. A rotating shaft 87 (motor shaft or a shaft connected to the motor shaft) is passed through the shaft connecting hole 85, and the rotating shaft 87 and the mounting table 125 can be rotated together around the axis of the rotating shaft 87 as a rotation center. Thus, the shaft coupling hole 85 and the rotary shaft 87 are coupled by a key 89. On the mounting table 125, a double tube 70 including the outer tube 2 and the inner tube 3 is placed.

  The pressing device 102 includes a hydraulic mechanism 103 that presses the inner tube 3 in the insertion direction, a control device 104 that controls the hydraulic mechanism 103, and a pressing body 94. The hydraulic mechanism 103 includes a cylinder 109 fixed to the mounting base 104a installed on the upper surface 123 of the mounting base 125, a piston 107 provided so as to reciprocate in the direction of insertion into the ground 10 of the outer pipe 2 by hydraulic pressure, And a control device 104. A pressing body 94 is connected and coupled to a mounting plate 108 provided at the tip of the piston 107. The casing 105 of the stepping motor 82, the bearing 106 that rotatably supports the rotating shaft 87, the control device 81 of the stepping motor 82, and the control device 104 of the hydraulic mechanism 103 are fixed to the base 110. The configuration of the pressing body 94 is the same as the configuration of the pressing body 94 of the best mode 1.

  According to the above configuration, the double tube body 70 is placed on the mounting table, the rear end portion of the inner tube 3 of the double tube body 70 is held by the holding body 100, and the pressing surface 99 and the inner tube are By driving the stepping motor 82 in a state in which the rear end surface 71 of the third tube is in contact with each other, the insertion angle of the double tube 70 into the ground 10 can be adjusted. Then, the control device 104 controls the hydraulic mechanism 103 to extend the piston 107 in the direction in which the outer pipe 2 is inserted into the natural ground 10, thereby installing the double pipe body 70 on the natural ground 10. The control device 104 controls the hydraulic mechanism 103 to return the piston 107 in the direction opposite to the insertion direction, thereby pulling out the inner tube 3 from the inner side of the outer tube 2 to the tunnel cavity 116. When the hydraulic mechanism 103 is used, the pressing force can be controlled by the control device 104, and the outer tube 2 can be easily installed on the natural ground 10.

  Since the hydraulic mechanism 103 having a piston stroke of 6 m or more is a special device, for example, by using the hydraulic mechanism 103 having a piston stroke of about 50 cm to 1 m, the piston 107 is extended and the double tube 70 is made 50 cm to 50 cm. A transmission material that transmits the force of the piston 107 to the pressing surface 99 between the pressing surface 99 and the rear end surface 71 of the inner tube 3 after the piston 107 is retracted every time the pressure is pressed by about 1 m (for example, the rear end surface 71 is the pressing surface). 99 and a steel pipe whose front end surface is in contact with the rear end surface 71 of the inner pipe 3 may be installed.

Best Mode 5
As shown in FIG. 17, an angle setting device using an elevating device 300 such as a hydraulic jack that moves the front end side of the rack 83 or the mounting table 125 up and down around the axis of the rotating shaft 87 may be used. .

Best Mode
In the best modes 1 to 5, since the outer tube 2 is long, when the outer tube 2 is pushed into the natural mountain 10, the outer tube 2 is likely to swing up and down and right and left. When the outer tube 2 swings up, down, left and right when the outer tube 2 is pushed into the ground 10, the force applied to the rear end side of the inner tube 3 becomes difficult to be transmitted to the front end side of the outer tube 2, The force cannot be transmitted smoothly to the distal end side of the outer tube 2, and it becomes difficult to push the outer tube 2 into the natural ground 10.
Therefore, as shown in FIG. 18, when the outer tube 2 is pushed into the natural ground 10, a regulating means 301 that regulates the vertical and horizontal movement of the outer tube 2 is used. The restricting means 301 suppresses the upper surface of the outer tube 2 so as to press the outer tube 2 placed on the rack 83 or the mounting table 125 in the direction of the rack 83 or the mounting table 125, and moves the outer tube 2 upward. An upper restricting plate 302 that restricts the movement of the outer tube 2, a right restricting plate 303 that is provided on the right side of the outer tube 2 to restrict the movement of the outer tube to the right side, and a left movement of the outer tube 2 that is disposed on the left side of the outer tube 2. The left restricting plate 304 that restricts the movement of the outer tube 2 and the rack 83 and the mount 125 that function as the lower restricting plate 305 that restricts the downward movement of the outer tube 2. By using this restricting means 301, it is possible to prevent the outer pipe 2 from swinging up and down and left and right when the outer pipe 2 is pushed into the natural ground 10, so that the outer pipe 2 that has already entered the natural ground 10 is The outer tube 2 that has not yet entered the natural ground 10 can be inserted straight into the natural ground 10. In particular, when the length of the outer tube 2 is long, it is effective to provide the regulating means 301 at a position close to the natural ground 10.

Best Mode 7
If water mixed with air is injected, the amount of water can be reduced with the same injection force as compared with the case where air is not mixed. Therefore, the amount of suction water in the discharge operation can be reduced, and the inside of the leading guide member 8 can be reduced. Since the earth and sand taken in can be made into muddy water, the soil can be drained smoothly.

  The leading end of the outer long tube 7 itself may be formed as a sharp ring-shaped blade 11 without using the leading guide member 8 that is separate from the outer long tube 7. In this case, inside the outer tube 2 closer to the center than the distal end of the outer tube 2, the inner surface of the outer tube 2 comes into contact with the inner surface of the outer tube 2 by contacting the pressing surface 40 of the outer tube pressing member 26 of the inner tube 3. What is necessary is just to provide the to-be-pressed surface which plugs up the gap | interval between the outer surfaces of the pipe | tube of the front end side of the pipe | tube 3. The blade 11 is not necessarily a sharp ring-shaped blade. For example, a ring-shaped blade in which the tip of the outer tube 2 is formed thin or a blade in which the tip of the outer tube 2 is formed in a saw blade shape may be used. The outer tube 2, the inner tube 3, and the blade 11 are not limited to those having a circular cross section, but may have a rectangular cross section or other shapes.

  As the outer tube pressing member 26 provided at the distal end of the inner tube 3, a circular plate with a central hole having a threaded portion formed on the outer periphery is used, and a threaded portion is formed on the inner surface of the tube of the leading guide member 8 and the inner surface of the outer tube 2. And these screw portions may be screwed together. In this case, after the outer tube 2 is installed in the ground 10, the inner tube 3 can be turned to release the screw connection, and the inner tube 3 can be pulled out into the tunnel cavity 116. According to this configuration, it is possible to reliably close the gap between the inner surface of the tube on the distal end side of the outer tube 2 and the outer surface of the tube on the distal end side of the inner tube 3. Moreover, since the double tube 70 in which the inner tube 3 and the outer tube 2 are integrated can be formed, the handling of the double tube 70 becomes easy. In this configuration, it is possible to press the outer tube 2 during the pushing operation. When the outer tube 2 is pushed, a hole or notch for drawing out the water supply hose 51 or the suction tube 68 may be provided in the outer tube 2.

  The distal end portion of the water supply hose 51 may protrude forward from the distal end surface 35 of the outer tube pressing member 26, and the distal end opening of the water supply hose 51 may be used as the injection nozzle 28.

  If the rotational driving torque by the motor is insufficient, a gear reduction device may be used.

  The double tubular body 70 is inserted in a direction intersecting the inner wall surface 117, but the intersection angle between the double tubular body 70 and the inner wall surface 117, that is, the insertion angle α0 is 4 ° (FIG. 8; (See FIG. 11).

  If the insertion hole 119 for inserting the distal end portion 180 is formed in the boundary portion 118 of the face 115, the positioning operation of the distal end portion 180 can be facilitated, but the insertion hole 119 is not necessarily formed.

  After positioning the front-end | tip part 180 of several receiving materials along the boundary part 118 at predetermined intervals using the several receiving material installation 1, the said several receiving material is cut face from the boundary part 118 The operation of inserting and installing in the direction crossing the inner wall surface 117 toward the ground in front of 115 may be performed simultaneously with the plurality of receiving material installations 1 as described above, You may make it carry out by shifting time for every receiving material installation 1 individually.

  Although the case where the steel pipe 7 having a length of, for example, about 6 m to 15 m is used as the outer pipe 2 as the receiving material has been described, in the present invention, an outer pipe of 6 m or less or an outer pipe of 15 m or more can be used. is there.

  Without using an inner tube, injection device, and discharge device, a machine with spiral blades rotating like an auger functioning as an inner tube and discharge device is installed inside the tube that functions as an outer tube. While pushing the auger and the pipe together into the ground, the earth and sand taken inside the pipe may be conveyed and discharged to the rear of the auger via a spiral path that rotates by rotating a spiral blade of the auger.

The disassembled perspective view of a tip receiving material installation apparatus (best form 1). (A) is sectional drawing of a receiving material installation apparatus, (b) is AA sectional drawing (best form 1) of Fig.2 (a). (A) is a perspective view which shows a mount frame, (b) is a perspective view which shows a multiple receiving material installation apparatus (best form 1). (A) is a figure which shows a pushing apparatus and the circumferential direction positioning mechanism, (b) is the figure which looked at the pushing apparatus and the circumferential direction positioning mechanism from the back side of the pushing apparatus (best form 1). (A) is the figure which looked at the multiple pre-receiving material installation apparatus before angle setting from the side, (b) is the figure which shows the state which positioned the front-end | tip part of the pre-receiving material in the insertion hole (best form 1). (A) is the figure which expanded the state which positioned the front-end | tip part of the double pipe body in the insertion hole, (b) is a double pipe body in the ground, attracting the earth and sand collapsed by the water sprayed from the injection apparatus. The figure which shows the state pushed into a mountain (best form 1). (A); (b) is a perspective view which shows the circumferential direction positioning operation | movement by the circumferential direction positioning mechanism (best form 1). The figure which shows the insertion angle of an outer tube | pipe (the best form 1). The figure which looked at the outer tube | pipe installed in the natural ground from the boundary part of the inner wall face and face of a tunnel cavity part from the wellhead side (best form 1). The figure which shows a mount frame (best form 2). The figure which shows the insertion angle of an outer tube | pipe (the best form 2). (A) is a figure which shows a pushing apparatus and the circumferential direction positioning mechanism, (b) is the figure which looked at the pushing apparatus and the circumferential direction positioning mechanism from the back side of the pushing apparatus (best form 2). (A) is the figure which looked at the multiple pre-receiving material installation apparatus before angle setting from the side, (b) is the figure which shows the state which positioned the front-end | tip part of the pre-receiving material in the insertion hole (best form 2). (A); (b) is a figure which shows the circumferential direction positioning operation | movement by the circumferential direction positioning mechanism (best form 2). (A) is the figure which shows the state which positioned the front-end | tip part of the some double pipe body corresponding to the number of the outer pipes installed in a natural ground in an insertion hole, (b) is the number of the outer pipes installed in a natural ground The figure which shows the state which installed the corresponding some double pipe body in the natural ground (best form 3). (A) is the figure which looked at the pushing apparatus from back, (b) is the side view of pushing apparatus (best form 4). The figure which shows the angle setting method using an up-and-down movement jack (best form 5). (A) is a perspective view which shows a control means, (b) is a front view which shows the relationship between a control means and an outer tube (best form 6).

Explanation of symbols

1 Pre-receiving material installation device, 2 outer tube, 3 inner tube, 4 injection device, 5 discharge device,
6 pushing device, 9 through hole, 10 ground, 115 face,
116 tunnel cavity, 117 inner wall surface, 118 boundary, 119 insertion hole,
150 multiple receiving material installation device, 153 circumferential positioning mechanism,
181 first position, 182 second position.

Claims (4)

When installing a receiving material in a direction crossing the inner wall from the boundary between the tunnel cavity face and the inner wall surface of the tunnel cavity toward the ground in front of the face, the tunnel at the boundary In the receiving material installation method in which a plurality of receiving materials are arranged side by side in the direction along the circumferential direction of the inner wall surface of the cavity,
Contacting the blade and the working face provided on the distal end of the tube and those tube as previously receiving material having a plurality of through holes penetrating in the inner and outer surfaces and a pushing device for pushing the tube into the natural ground A device mounting formed by a plurality of receiving material installing devices and a semi-cylindrical outer peripheral surface obtained by halving a cylinder or a semi-cylindrical outer peripheral surface obtained by halving a cylinder from which the top side of a hollow cone is removed. And using,
A plurality of pre-receiving material installation devices are arranged on the outer peripheral surface of the apparatus mounting portion at a predetermined interval along the circumferential direction of the outer peripheral surface, and the tip portions of the plurality of pre- receiving materials are along the boundary portion. After positioning the plurality of receiving materials at intervals in the direction, the plurality of receiving materials are inserted in the direction intersecting the inner wall surface from the boundary toward the ground in front of the face, so that the plurality of receiving materials are tunneled. A receiving material installation method , wherein a plurality of receiving materials are installed at the same time when they are installed so as to be lined up in a direction along the circumferential direction of the inner wall surface. An inner pipe is provided inside the pipe, and the inner pipe and the pipe are pushed together into the ground using the pushing device, and the inner pipe is inserted from the rear end side of the pipe using an injection device. The tip receiving material installation method according to claim 1 , wherein water is sprayed to the inside of the tip portion of the pipe via a gap between the pipe and the pipe . The pre-receiving material installation method according to claim 2 , wherein water mixed with air is sprayed as the water .   Using a multi-receiving material installation device that inserts and installs a plurality of receiving materials, the multi-receiving material installation device inserts and installs the receiving material for each receiving material. A receiving member installation device, and a circumferential positioning mechanism that moves the plurality of prior receiving device installation devices together in a direction along the circumferential direction of the inner wall surface of the tunnel cavity and positions them at a predetermined position. After positioning the plurality of receiving material setting devices at the first position by the positioning mechanism and inserting and installing the plurality of receiving materials by the plurality of receiving material setting devices, the circumferential positioning mechanism The plurality of receiving material installation devices are positioned at a second position where the plurality of receiving material installation devices are moved in a direction along the circumferential direction of the inner wall surface of the tunnel cavity from the first position. A request characterized by inserting and installing a receiving material 1 previously receiving material installation method according to claim 3.