JP2019060079A - Pipe body propulsion device - Google Patents

Abstract

To provide a pipe body propulsion device capable of driving a pipe body into the ground with a small force by reducing a frictional force between a diaphragm and an outer peripheral surface of the pipe body.SOLUTION: A pipe body propulsion device 10 includes: a pipe body 20; a jack mechanism 104 which is arranged at a position opposite to a rear end surface of the pipe body 20, presses the rear end surface of the pipe body 20, and propels the pipe body 20 toward the ground; a diaphragm 30 which is drawn out from an outlet provided on the pipe body 20 onto an outer peripheral surface of the pipe body 20 accompanying the propulsion of the pipe body 20 such that at least a part of the outer peripheral surface of the pipe body 20 is isolated from the ground, and reduces a friction force between the pipe body 20 and the ground; and a lubricant R which is interposed between the diaphragm 30 and the outer peripheral surface of the pipe body 20.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe propulsion device for promoting a pipe body so as to cross a ground immediately below a structure such as a track, a road, or a building, and burying the pipe body in the ground. The present invention relates to a pipe propulsion device capable of preventing the movement of the soil by reducing the friction between the two.

  Conventionally, for example, as shown in Patent Document 1, a tube propulsion method (for example, an R & C method etc.) is known in which a tube body is propelled against a ground moving from a starting shaft to a reaching shaft. There is. As shown in FIG. 10, in a general tubular body propulsion method, H steel (not shown) is driven on both sides of a track 120 such as a track or a road, and a start shaft 100 and a reach shaft (figure After excavating (not shown), a propulsion stand 102 is installed on the bottom of the vertical shaft 100 on the launch side, and a pipe with a length of about 7 m with a cutting edge 105 connected to the tip end on this propulsion stand 102 The body 101 is placed with the mouth portion 105 facing the direction crossing the track. Then, a reaction pile 103 is provided on the inner wall on the opposite side (rear end side) to the propelling direction of the shaft 100 on the start side, and a jack mechanism (propelling jack) between the reaction pile 103 and the rear end surface of the tube 101 Install the 104.

  In the cutting edge portion 105, a roll body 107a in which the diaphragm 107 is wound around a winding device such as a reel is provided. The diaphragm 107 is drawn onto one surface of the outer periphery of the tube 101. The edge of the diaphragm 107 is fixed to the H steel of the retaining wall 108 formed on the inner wall of the starting shaft 100 in the propelling direction (tip side) using a vise or the like.

  Further, in FIG. 10, in order to secure the reaction force, a reaction force body 111 is formed by the ground at the rear end side of the start shaft 100, and the shaft 112 is excavated at the rear end side of this reaction force body 111. Then, a supplementary reaction force pile 113 made of H steel is driven in.

When the propulsion jack 104 is operated, the tubular body 101 is pushed in the propulsion direction by the reaction force from the reaction pile 103 and the supplementary reaction pile 113, and the ground 109 is excavated by the cutting edge 105, and the pipe 101 is in the ground 109. Promote.
At this time, the diaphragm 107 is pulled out of the roll body 107 a so as to cover one surface of the outer periphery of the tube body 101, thereby blocking the contact between the tube body 101 and the ground 109. The diaphragm 107 prevents the soil around the tubular body 101 from moving along with the propulsion of the tubular body 101.

  After propelling the first tube 101 toward the reaching shaft, next, another tube 101 not provided with a cutting edge is prepared in the starting shaft 100, and the first tube 101 is The rear end face and the tip end face of the next tube 101 are connected by welding or the like. Then, in the same manner as the first tube body 101, the rear end surface of the next tube body 101 is propelled toward the ground 109 by the propulsion jacks 104. By repeating this, a pipe body in which a plurality of pipe bodies 101 are connected is formed, and the pipe body penetrates the ground 109 and crosses under a track 120 such as a track or a road.

Japanese Patent Publication No. 47-24803

  However, in the tubular body propulsion method disclosed in Patent Document 1, when the tubular body 101 propels the inside of the ground 109, the tubular body 101 moves to the tip side while rubbing the back surface of the diaphragm 107 from which the outer peripheral surface is pulled out. There is a problem that a frictional force is generated between the diaphragm 107 and the outer peripheral surface of the tubular body 101, and it is necessary to give the tubular body 101 a large propulsive force.

  The present invention has been made focusing on the above-mentioned problems, and it is possible to reduce the frictional force between the diaphragm and the outer peripheral surface of the tube and to promote the tube toward the ground with a small force. It aims at providing a pipe propulsion device.

  The pipe propulsion device according to the present invention comprises: a pipe body; and a jack mechanism disposed at a position facing the rear end face of the pipe body and pressing the rear end face of the pipe body to propel the pipe body toward the ground The protuberance is drawn out from the outlet provided on the pipe onto the outer peripheral surface of the pipe body as the pipe body is propelled so as to isolate at least a part of the outer surface of the pipe body from the ground. A diaphragm for reducing the frictional force between the tube and the ground, and a lubricant interposed between the diaphragm and the outer peripheral surface of the tube.

  According to the above configuration, since the friction force between the diaphragm and the outer peripheral surface of the tube is reduced by the lubricant, the tube can be propelled toward the ground with a small force.

  In a preferred embodiment, the diaphragm is housed in a rolled state in a housing portion provided inside the distal end side of the tubular body.

  According to the above configuration, the rolled membrane is drawn from the inside of the housing onto the outer peripheral surface of the tube.

  In a preferred embodiment, the lubricant is discharged between the diaphragm and the outer peripheral surface of the tube by a lubricant discharging mechanism.

  In a preferred embodiment, the lubricant discharge mechanism includes a lubricant discharge device provided inside the tube and a discharge port provided on the rear end side of the outlet of the tube, and the lubricant discharge device The control unit discharges the lubricant from the discharge port.

  Since the lubricant discharged from the discharge port is applied to the back surface of the diaphragm drawn from the outlet toward the rear end side, the lubricant intervenes between the diaphragm and the outer peripheral surface of the tube.

  In one embodiment, a plurality of the discharge ports are provided along the width direction in the pipe body.

  According to the above configuration, the lubricant is widely applied to the back surface of the diaphragm.

  In one embodiment, the lubricant discharge mechanism includes a groove formed along the width direction on the outer peripheral surface of the tube, and the groove is in communication with the discharge port.

According to the above configuration, since the lubricant discharged from the discharge port is filled in the groove, it comes in contact with the back surface of the drawn diaphragm, and spreads between the outer peripheral surface of the tube and the back surface of the diaphragm. As a result, the lubricant can be interposed between the diaphragm and the outer peripheral surface of the tube over a wide range.
In addition, by matching the length of the groove to the entire length of the diaphragm in the width direction, the lubricant contacts the entire back surface of the diaphragm, and the lubricant is uniformly applied to the back surface of the diaphragm.

  According to one embodiment, the lubricant discharge device includes a cylinder containing the lubricant, a piston slidably provided inside the cylinder, and drive means for reciprocating the piston inside the cylinder. .

  According to the above configuration, the lubricant can be discharged from the discharge port by a simple operation of driving the piston.

  In another embodiment, the lubricant is pre-applied to the back of the diaphragm.

  According to the above configuration, it is not necessary to separately provide a lubricant discharge mechanism in the tubular body.

  In a preferred embodiment, the lubricant includes any one of grease, oil, polymeric lubricant, and a mixture of grease and rigid spheres.

  According to said structure, the frictional force between a diaphragm and the outer peripheral surface of a pipe body can be reduced.

  The lubricant may be a mixture of grease and a rigid sphere, and the sphere may have a diameter of 0.3 mm or more and 3 mm or less.

The friction between the diaphragm and the outer peripheral surface of the tube can be further reduced by mixing the lubricant with a rigid sphere.
In addition, since the spheres are held on the outer peripheral surface of the tube by the viscosity of the grease, even if the mixture is interposed between the side or bottom of the tube and the diaphragm, it is possible to prevent the spheres from falling off. it can.

  The lubricant may be a mixture of grease and rigid spheres, and the weight ratio of the grease to the spheres may be 0.3 or more and 3 or less, where the grease is one.

  According to the present invention, it is possible to reduce the frictional force between the diaphragm and the outer peripheral surface of the pipe, and to push the pipe toward the ground with a small force.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which abbreviate | omitted one part which shows the whole structure of the tubular body propulsion apparatus which concerns on one Embodiment of this invention. It is a top view of the tip part of a tube. It is a side view of the tip part of a tube. It is a front view of a pipe body. It is sectional drawing which expands and shows an accommodating part and a lubricant discharge mechanism. It is a perspective view of the tip part of a tube. It is a top view of the tip part of the tube which shows other examples of a lubricant discharge mechanism. It is sectional drawing of the blade edge part which shows other embodiment of this invention. It is a side view of an experimental apparatus. It is sectional drawing which abbreviate | omitted one part which shows the whole structure of the tubular body propulsion apparatus which concerns on a prior art example.

Embodiments of the present invention will be described with reference to the drawings.
1 to 6 show a tubular body propulsion device 10 according to an embodiment of the present invention, and a prismatic tubular body 20 whose outer periphery is formed by a plurality of faces (four faces in this embodiment); A jack mechanism 104 disposed at a position facing the rear end surface of the body 20 and pressing the rear end surface of the tube 20 to propel the tube 20 toward the ground, and at least one surface of the outer periphery of the tube 20 In the form, the thin plate-like diaphragm 30 drawn onto the surface of the pipe 20 as the pipe 20 is propelled to the ground so that the upper surface and both side surfaces are isolated from the ground, and the diaphragm 30 and the pipe 20 A lubricant R interposed between the outer circumferential surface and the lubricant R, and a lubricant discharge mechanism 60 for discharging the lubricant R between the diaphragm 30 and the outer circumferential surface of the tubular body 20 are provided.

  In the following description, in FIG. 1, the direction in which the tube 20 propels is the front end side or the front side, the direction opposite to the front end direction is the rear end side or the rear side, and two directions orthogonal to the front and rear direction are the vertical direction And the width direction. Further, in the tubular body propulsion device 10 of the present embodiment, for the same configuration as that of the conventional example shown in FIG.

The tube body 20 includes a blade port 21 and a tube main body 22 provided continuously on the rear end side of the blade port 21. The cutting edge 21 is connected to the pipe body 22 by screwing or welding, and is removed from the pipe body 22 when the pipe body 20 reaches the vertical shaft on the arrival side.
The cutting edge 21 includes a tip cutting edge portion 211 and a rear end cutting edge portion 212 whose tip end is continuous with the rear end surface of the tip cutting edge portion 211 and whose rear end side is connected to the tube main body 22.

  As shown in FIGS. 2 and 4, the width L1 of the upper surface 211a and the lower surface 211b of the tip end blade opening 211 is the same as the width L2 of the upper surface 212a and the lower surface 212b of the rear end cutting edge 212. The width L3 between the side surfaces 212c and 212d in the width direction of the rear end cutting edge 212 is shorter than the widths L1 and L2, and the side surfaces 212c and 212d of the rear end cutting edge 212 are in the width direction of the front end cutting edge 211 It is located inside the side surfaces 211c and 211d.

  The outer peripheral surface of the tubular body 20 includes the upper and lower surfaces and both side surfaces 211a to 211d of the tip end blade opening 211, the upper and lower surface and both side surfaces 212a to 212d of the rear end blade opening 212, and the upper and lower surface and both side surfaces 22a of the pipe main body 22. It contains ~ 22d.

  As shown in FIG. 3, the tip end opening 211 has a shape in which the tip end is cut obliquely, and it is easy to take in the excavated earth and sand into the end opening 21.

Inside the upper surface 211a of the tip end opening 211, there is provided a concave accommodating portion 40 for accommodating the roll body 31 in a state in which the diaphragm 30 is tightly wound. As shown in FIG. 5, the opening 40 of the upper surface (outer surface) of the housing portion 40 is covered by the cover body 42 except for the outlet 41 for drawing out the diaphragm 30. The outlet 41 has an opening width and a length corresponding to the thickness and the width of the diaphragm 30, and is located at the rear end of the housing portion 40. The cover body 42 is attached by welding or the like so as to be continuous with the upper surface 211 a of the tip end opening 211.
The housing portion 40 has an internal shape and size corresponding to the outer shape of the roll body 31, and the width thereof is substantially the same as the width L 1 of the upper surface 211 a of the tip end blade opening 211. The housing portion 40 in the present embodiment has a rectangular cross-sectional shape, and the area where the outer peripheral surface of the roll body 31 contacts the inner wall of the housing portion 40 is reduced to facilitate rotation of the roll body 31.

  The lower end (inner end) of the housing portion 40 is an outlet 45 of the roll body 31. In the state where the roll body 31 is housed in the housing portion 40, the outlet 45 is closed by a flat lid 43. There is. In detail, flanges 40b and 40b having screw holes 47 and 48 are formed at the lower ends of the front and rear walls 40a and 40a of the storage unit 40, and screw holes 47 of flanges 40b and 40b are formed in the lid 43 Screw holes 49, 50 are formed at positions corresponding to 48, respectively. The lid 43 is fixed to the front and rear flanges 40 b and 40 b by screwing screws 44 into the screw holes 49 and 50 of the lid 43 and the screw holes 47 and 48 of the flanges 40 b and 40 b. The lid 43 doubles as a bottom plate that supports the roll 40 so as to roll freely, and the upper surface 46 is an upper surface 211 a of the tip end opening 211, an upper surface 212 a of the rear end opening 212, and an upper surface 22 a of the pipe body 22. It is parallel.

  The width of the diaphragm 30 is slightly shorter than the width of the housing portion 40, and one roll body 31 is housed in the housing portion 40. However, the diaphragm 30 is not more than half the width of the side surface of the tube 20. It may be of a width, and may be accommodated in the accommodating portion 40 in a state in which a plurality is continuous.

  As shown in FIG. 5, the wound end of the diaphragm 30 is pulled out from the outlet 41 onto the upper surface 211 a of the blade end 21 of the tubular body 20 so that the back surface of the diaphragm 30 faces the upper surface 211 a of the blade end 21. Be The roll body 31 is disposed in the housing portion 40 such that the wound end of the diaphragm 30 is opposed to the outlet 41 at the rear end portion in the housing portion 40. In addition, although the roll body 31 is a coreless thing in which the winding start end was open | released in the center part, not only this but a cored thing may be used. Movement of the roll body 31 in the front-rear direction is restricted by the front and rear walls 40 a of the housing portion 40.

  The diaphragm 30 is made of, for example, a thin film of metal such as galvanized steel, but is not limited to this, and may be made of a thin film of synthetic resin such as polyvinyl chloride or polyethylene or a thin film of carbon fiber fabric .

  The lubricant discharge mechanism 60 includes a discharge port 61 provided on the rear end side of the outlet port 41 of the pipe 20, a lubricant discharge device 62 provided inside the pipe 20, and discharging the lubricant R from the discharge port 61; It includes a groove 63 which is formed along the width direction on the outer peripheral surface of the body 20 (the upper surface 211a of the tip end edge portion 211 in FIG. 5) and communicates with the discharge port 61. The discharge port 61 opens at the bottom of the groove 63, and the groove 63 is filled with the lubricant R. In the present embodiment, the length of the groove 63 is substantially the same as the length of the outlet 41, and the discharge port 61 is located at the center in the lengthwise direction of the groove 63, but is not limited thereto. 61 may be located at the longitudinal end of the groove 63, and the length of the groove 63 may be shorter than the length of the outlet 41.

  The lubricant discharge device 62 includes a cylinder 64 filled with a lubricant R, a piston 65 slidably provided inside the cylinder 64, and drive means 66 for reciprocating the piston 65 inside the cylinder 64. The tip of the cylinder 64 communicates with the discharge port 61 via a tube 67 or the like. The lubricant R inside the cylinder 64 is discharged from the discharge port 61 by moving the piston 65 to the tip side. The driving means 66 is, for example, a hydraulic cylinder, and causes the piston 65 to reciprocate by the rod 66a.

The lubricant R includes one selected from the group consisting of grease, oil, polymeric lubricant, and a mixture of grease and rigid spheres. The polymer lubricant includes, for example, an emulsion made of a polymer material such as polyacrylamide and has lubricity.
In the present embodiment, the lubricant R is a mixture of grease and rigid spheres. The spherical body of the mixture has a rigidity not to be deformed by the force received from the ground 109 when the tubular body 20 propels the ground 109, and is made of metal such as steel, for example, but is made of synthetic resin. May be The spheres have a diameter of 0.3 mm or more and 3 mm or less, and the weight ratio of grease to the spheres is 0.3 or more and 3 or less, assuming that the grease is one. The grease holds a sphere, has plasticity, and has a viscosity (consistency) that does not move freely in the groove 63. The mixture discharged from the discharge port 61 into the groove 63 is pushed by the mixture discharged later and moves along the groove 63 to fill the groove 63. That is, the groove 63 functions as a guide for spreading the lubricant R in the width direction of the tube 20. The lubricant R contacts the back surface of the diaphragm 30 at the opening of the groove 63 and spreads between the diaphragm 30 and the outer peripheral surface of the tube 20.

  The lubricant discharge device 62 is not limited to the above configuration, and may have any configuration as long as the lubricant R can be discharged from the discharge port 61. For example, the lubricant R may be constituted by a tank containing the lubricant R, a tube 67 connecting the tank and the discharge port 61, and a pump provided in the middle of the tube 67. The ink is discharged from the discharge port 61.

Further, as shown in FIG. 7, a plurality of discharge ports 61 may be opened at equal intervals in the bottom surface of the groove 63, and the tubes 67 connected to one lubricant discharge device 62 may be communicated with each discharge port 61. The lubricant discharge device 62 may be provided for each discharge port 61. Thus, the lubricant R can be uniformly filled in the groove 63 in a short period of time by providing a plurality of discharge ports 61.
Although the discharge port 61 is provided on the bottom surface of the groove 63 in the present embodiment, it may be provided on the side surface of the groove 63.

  Furthermore, the groove 63 may not be provided, and one or more discharge ports 61 may be provided so as to open on the outer peripheral surface of the tube 20. In particular, when the lubricant R is an oil or a polymer lubricant, the lubricant R moves on the outer peripheral surface by discharging the lubricant R to the outer peripheral surface of the tubular body 20, and the lubricant R moves between the moving diaphragm 30 and the tubular body 20. Spread between the outer peripheral surface.

  As shown in FIG. 2 and FIG. 3, the rear end cutting edge 212 has concave accommodating portions 40, 40 for accommodating the roll body 31 in which the diaphragm 30 is wound on the inner side of both side surfaces 212 c, 212 d in the width direction. Is provided. The width of each of the accommodation portions 40 and 40 of the side surfaces 212 c and 212 d substantially matches the length of the side surface of the rear end cutting edge portion 212 in the vertical direction. Furthermore, a lubricant discharge mechanism 60 is provided on the inner side of both side surfaces 212c and 212d.

In the present embodiment, the groove 63 of the lubricant discharge mechanism 60 is provided in the vertical direction, and the discharge port 61 is provided at the upper end of the groove 63. The lubricant R, which is a mixture of grease and spheres, is discharged from the discharge port 61 and flows downward. Since the opening of the groove 63 is covered with the diaphragm 30, the lubricant R is filled in the groove 63 without falling off the groove 63.
In addition, the formation position of the discharge port 61 is not limited to this, You may provide in the length direction center part of the groove | channel 63. As shown in FIG.

  The other components of the housing portion 40, the roll body 31 housed in the housing portion 40, and the lubricant discharge mechanism 60 are the housing portion 40 formed on the upper surface 211a of the tip end opening 211, the roll body 31, and the lubricant discharge It is the same as the mechanism 60, and the detailed description is omitted by attaching the same reference numerals to the corresponding components.

  In the case where the lubricant R is an oil or a polymeric lubricant, the discharge port 61 is opened at the upper end portions of the side surfaces 212c and 212d without forming the groove 63. The lubricant R spreads in the vertical direction, that is, the width direction, of both side surfaces 212 c and 212 d by gravity, and the lubricant can be applied to the entire back surface of the diaphragm 30.

  In the tubular body propulsion device 10 of the present embodiment, the operator operates the lubricant discharge device 62 of the lubricant discharge mechanism 60 to fill the groove 63 with the lubricant R before the start of work. When work is started, and the pipe body 20 is pushed by the jack mechanism 104 and promoted toward the ground, the diaphragm 30 of the roll body 31 is directed toward the rear end side from the outlet 41 provided in the accommodation portion 40 It pulls out on the outer peripheral surface of the body 20 one by one. In the present embodiment, the diaphragm 30 of the roll body 31 provided at the tip end opening 211 is drawn on the upper surface 212 a of the rear end opening 212 and the upper surface 22 a of the pipe main body 22. The diaphragm 30 of the roll body 31 provided inside is pulled out on the side surfaces 212 b and 212 c of the rear end edge portion 212 and the side surfaces 22 b and 22 c of the pipe main body 22.

  The diaphragm 30 is pulled out in contact with the lubricant R whose back surface is filled in the groove 63, and the lubricant R is interposed between the outer peripheral surface of the tubular body 20 and the back surface of the diaphragm 30. For this reason, the frictional force between the diaphragm 30 and the outer peripheral surface of the tubular body 20 is reduced, and the tubular body 20 can be promoted toward the ground with a small force.

  As described above, since the tubular body 20 can be propelled toward the ground with a smaller force than in the case where the lubricant R does not intervene, a small jack mechanism 104 with a small maximum propulsive force can be used. Since the jack mechanism 104 is small, the scale of the start shaft 100 can be small. Furthermore, since the propulsive force of the jack mechanism 104 is small, the reaction force is also small, and the reaction force body 111, the vertical shaft 112 and the supplementary reaction force pile 113 provided in the prior art shown in FIG. In addition, the size of the crane for installing the jack mechanism 104 in the shaft 100 is reduced, and the number of trucks for transporting equipment and the like can be reduced. Therefore, the cost for the pipe promotion work can be significantly reduced.

  Further, when the tubular body 20 is pushed by the jack mechanism 104 and propelled to the ground, the winding end end of the diaphragm 30 of the roll body 31 is pulled out from the outlet port 41 provided in the housing portion 40. Since the diaphragm 30 is drawn from the outlet 41 in a direction perpendicular to the bottom surface 46 of the housing 40, the roll body 31 is pushed up from the bottom surface 46 of the housing 30, and the frictional force between the diaphragm 30 and the bottom surface 46 And the diaphragm 30 can be pulled out while loosening the roll 31. Furthermore, since the roll body 31 is not pressed against the front surface 40a and the rear surface 40a of the housing portion 40, the frictional force between the diaphragm 30 and the front and rear walls 40a is small, and when the diaphragm 30 is pulled out Hard to tighten. For this reason, a large force is not required to pull out the diaphragm 30, the drawing of the diaphragm 30 becomes smooth, and it becomes possible to propel the tubular body 20 toward the ground with a small force.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning of this invention.
For example, the groove 63 may be provided only at the central portion in the width direction of the outer peripheral surface of the tube 20. In this case, the lubricant R is applied to the central portion of the back surface of the diaphragm 30. Since the lubricant R intervenes between a part of the back surface of the diaphragm 30 and the outer peripheral surface of the tubular body 20, the friction force between the diaphragm 30 and the outer peripheral surface of the tubular body 20 is greater than when no lubricant R intervenes. Reduce.

  Further, in the present embodiment, the lubricant discharge mechanism 60 is provided to discharge the lubricant R between the diaphragm 30 and the outer peripheral surface of the tubular body 20. However, without providing the lubricant discharge mechanism 60, the lubricant as the roll body 31 is used. It is also possible to use one in which R is previously applied to the back surface of the diaphragm 30.

FIG. 8 shows another embodiment. In the embodiment shown in FIG. 8, the tube 20 is cylindrical. Further, the cutting edge portion 21 is also not divided into the front end cutting edge portion 211 and the rear end cutting edge portion 212, and has a cylindrical shape. Inside the peripheral surface on the upper side of the blade opening 21, a plurality of housing portions 40 (six in FIG. 8) are circumferentially extended over an angular range in which the central angle α is 45 degrees to the left and right with respect to the vertical direction Are provided at equal angular intervals. The width of the diaphragm 30 constituting the roll body 31 housed in the housing portion 40 and the housing portion 40 is set short enough to be able to be along the inner peripheral surface of the blade opening 21. In addition, a lubricant discharge mechanism 60 is provided in the inside of the tubular body 20 for each of the housing portions 40.
The other configuration is the same as that of the embodiment of FIG. 1, and the description will be omitted.
Even in the above embodiment, since the lubricant R intervenes between the outer peripheral surface of the tubular body 20 and the back surface of the diaphragm 30, the frictional force between the diaphragm 30 and the outer peripheral surface of the tubular body 20 is reduced. It is possible to promote the pipe body 20 to the ground with a small force. In addition, a large force is not required to pull out the diaphragm 30, and the drawing of the diaphragm 30 becomes smooth.

Experimental example

In the tubular body propulsion device 10 shown in FIG. 1 to FIG. 6 of the present invention, measurement experiments of friction force were conducted on experimental examples 1 to 4 using different lubricants R and comparative examples not using the lubricant R.
The measurement experiment was performed by an experimental apparatus 80 simulating the diaphragm 30 of the present invention and the outer peripheral surface of the tubular body 20.

  The configuration of the experimental apparatus 80 will be described with reference to FIG. A fixed plate 84 having a length of 2 m and a width of 30 cm was placed on the upper surface of the rectangular base 81 and on one end side in the length direction (left side in FIG. 9). The fixed plate 84 has the plate 83 mounted on the upper surface of the support member 82. After a lubricant R was applied to the upper surface of the plate 83, a plated steel plate 85 having the same width as the fixing plate 84 and slightly longer than the fixing plate 84 was placed. A weight 86 having a length of 1 m and a weight of 94 kg was placed on the upper surface of the plated steel plate 85 and on one end side in the length direction. A hydraulic cylinder 88 is connected to the other end side (right side in FIG. 9) of the plated steel plate 85 in the length direction (a right side in FIG. 9) and protrudes from the fixing plate 84 via a load cell 87. The hydraulic cylinder 88 was mounted on the base 81 by the support member 89 so as to be horizontal to the plated steel plate 85.

  The plated steel plate 85 was pulled by the hydraulic cylinder 88 at a speed of about 1 m per minute for 30 seconds, the load between the two was measured by the load cell 87, and the average value was calculated (referred to as average load). The upper surface of the plate 83 of the fixing plate 84 of the test apparatus 80 corresponds to the outer peripheral surface of the tube 20 of the present embodiment, and the plated steel plate 85 of the test apparatus 80 corresponds to the diaphragm 30 of the present embodiment. The weight 86 corresponds to the ground of the present embodiment, and the average load measured by the test device 80 corresponds to the frictional force between the diaphragm 30 and the outer peripheral surface of the tube 20.

Experimental Examples 1 to 4 use different lubricants R. The lubricant R in Experimental Example 1 is a silicone oil, and KF-96 manufactured by Shin-Etsu Chemical Co., Ltd. was used. The lubricant R of Experimental Example 2 is a polymer lubricant, and is obtained by diluting Kantoru F manufactured by Pharmaceutical Development Center Co., Ltd. 100 times with water. The lubricant R of Experimental Example 3 is a grease obtained by blending molybdenum disulfide with lithium grease, and GSE025 manufactured by Garage Zero Corporation was used. The lubricant R of Experimental Example 4 is a mixture of grease and steel balls, and the same grease as that of Experimental Example 3 and steel balls having a diameter of 1 mm are mixed at a weight ratio of 1: 1. The comparative example does not use lubricant R.
The lubricant R of Experimental Examples 1 to 3 was coated with a brush to a thickness of 0.1 mm on the upper surface of the plate 83, and the lubricant R of Experimental Example 4 was coated with a rubber blanket to a thickness of 1 mm.

  The experimental results are shown in the table. The average load in the case where the lubricant R of the comparative example is not used is 0.263 kN, and assuming this to be 100%, the experimental example 1 has an average load of 73.4%, the experimental example 2 89.0%, and the experimental example The average load of 3 was 66.2%, and that of Experimental Example 4 was 50.2%. In Experimental Examples 1 to 4, the average load was reduced as compared with the comparative example. Also in the tube propulsion device 10 shown in FIGS. 1 to 6 of the present invention, it is considered that the friction force between the diaphragm 30 and the outer peripheral surface of the tube 20 is reduced by using the lubricant R. In particular, in the experimental example 4, the average load was reduced to about half that of the comparative example. It has been found that mixing the rigid spheres with grease reduces the friction force.

DESCRIPTION OF SYMBOLS 10 pipe body propulsion apparatus 20 pipe body 21 blade mouth part 211 tip blade mouth part 212 rear end blade mouth part 22 pipe main body 30 diaphragm 40 accommodation part 41 outlet 60 lubricant discharge mechanism 61 discharge outlet 62 lubricant discharge device 63 groove 64 cylinder 65 Piston 66 Drive means 100 Vertical shaft 102 on the start side Propulsion base 103 Reaction pile 104 Jack mechanism 109 Ground 120 Track R Lubricant

Claims (11)

Tube body,
A jack mechanism disposed at a position facing the rear end surface of the pipe, pressing the rear end surface of the pipe to propel the pipe toward the ground;
The pipe is pulled out onto the outer peripheral surface of the pipe from the outlet provided in the pipe as the pipe is pushed so as to isolate at least a part of the outer surface of the pipe from the ground. A diaphragm that reduces the friction between the body and the ground;
A lubricant interposed between the diaphragm and the outer peripheral surface of the tube;
Pipe propulsion device comprising:   The pipe propulsion device according to claim 1, wherein the diaphragm is housed in a roll-shaped state in a housing portion provided inside the distal end side of the pipe body.   The pipe propulsion device according to claim 1, wherein the lubricant is discharged between the diaphragm and the outer peripheral surface of the pipe by a lubricant discharge mechanism.   The lubricant discharge mechanism includes a lubricant discharge device provided inside the pipe and a discharge port provided on the rear end side of the outlet of the pipe, and the lubricant discharge device is formed from the discharge port. The pipe propulsion device according to claim 3, wherein the lubricant is discharged.   The pipe propulsion device according to claim 4, wherein a plurality of the discharge ports are provided in the width direction in the pipe body.   The said lubricant discharge mechanism is provided with the groove | channel formed along the width direction in the outer peripheral surface of the said tube, The said groove | channel is in communication with the said discharge port, The pipe propulsion in any one of Claim 4 or 5 apparatus. The lubricant discharge device is
A cylinder containing the lubricant;
A piston slidably provided inside the cylinder;
5. The pipe propulsion device according to claim 4, further comprising: drive means for reciprocating the piston within the cylinder.   The tubular body propulsion device according to claim 1, wherein the lubricant is previously applied to the back surface of the diaphragm.   The tubular body propulsion device according to claim 1, wherein the lubricant comprises any one of grease, oil, polymeric lubricant, and a mixture of grease and rigid spheres.   The pipe propulsion device according to claim 1, wherein the lubricant is a mixture of grease and a rigid sphere, and the sphere has a diameter of 0.3 mm or more and 3 mm or less.   The lubricant according to claim 1 or 10, wherein the lubricant is a mixture of grease and rigid spheres, and the weight ratio of the grease to the spheres is 0.3 or more and 3 or less, where the grease is 1. Pipe propulsion device.