JP6342561B1 - Tube propulsion device - Google Patents

Abstract

To provide a tube propulsion device capable of reducing a frictional force between a diaphragm and an outer peripheral surface of a tube and propelling the tube toward the ground with a small force. A tubular body propulsion device 10 is disposed at a position facing a tubular body 20 and a rear end surface of the tubular body 20, and pushes the rear end surface of the tubular body 20 to propel the tubular body 20 toward the ground. The jack mechanism 104 and at least a part of the outer periphery of the tube body 20 are separated from the ground from the outlet provided in the tube body 20 along with the propulsion of the tube body 20 onto the outer surface of the tube body 20. A diaphragm 30 that is pulled out to reduce the frictional force between the pipe body 20 and the ground, and a lubricant R that is interposed between the diaphragm 30 and the outer peripheral surface of the pipe body 20 are provided. [Selection] Figure 1

Description

  The present invention relates to a tubular body propulsion device that embeds in a ground by propelling a tubular body so as to cross a ground directly under a structure such as a railroad, a road, or a building, and in particular, soil around the tubular body and the tubular body. The tube propulsion apparatus can reduce the frictional force between the two and prevent the movement of the soil.

  Conventionally, for example, as shown in Patent Document 1, a pipe propulsion method (for example, an R & C method or the like) is known in which a pipe is propelled against a ground from a starting side shaft to a reaching side shaft. Yes. As shown in FIG. 10, a general tubular body propulsion method is used to drive H steel (not shown) on both sides of a track 120 such as a railroad or a road, and a start side shaft 100 and a reaching side shaft (see FIG. 10). After the excavation, a propulsion table 102 is installed on the bottom surface of the start-up shaft 100, and a tube having a length of about 7 m is connected to the propulsion table 102 with a blade portion 105 on the tip side. The body 101 is placed so that the blade edge portion 105 faces the direction crossing the track. And the reaction force pile 103 is provided in the inner wall on the opposite side (rear end side) from the propulsion direction of the vertical shaft 100 on the start side, and a jack mechanism (propulsion jack) is provided between the reaction force pile 103 and the rear end surface of the tube body 101. 104 is installed.

  In the blade part 105, there is provided a roll body 107a in a state in which the diaphragm 107 is wound around a winder such as a reel. The diaphragm 107 is drawn out on one surface of the outer periphery of the tube body 101. The edge of the diaphragm 107 is fixed to the H steel of the earth retaining wall 108 formed on the inner wall in the propulsion direction (front end side) of the shaft 100 on the start 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 a natural ground on the rear end side of the starting shaft 100, and the shaft 112 is excavated on the rear end side of the reaction force body 111. And the supplementary reaction force pile 113 which consists of H steel is driven.

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

  After propelling the first tube body 101 toward the shaft on the arrival side, another tube body 101 not provided with a blade opening is prepared in the shaft 100 on the start side, and the first tube body 101 The rear end face and the front end face of the next tube body 101 are connected by welding or the like. Then, the rear end surface of the next tube body 101 is propelled toward the ground 109 by the propulsion jack 104 in the same manner as the first tube body 101. By repeating this, a tubular body in which a plurality of tubular bodies 101 are connected is formed, and this tubular body passes through the ground 109 and traverses under a track 120 such as a track or road.

Japanese Examined Patent Publication No. 47-24803

  However, in the tubular body propulsion method described in Patent Document 1, when the tubular body 101 propels the ground 109, the tubular body 101 moves to the distal end side while rubbing the back surface of the diaphragm 107 from which the outer peripheral surface is drawn. There is a problem that a frictional force is generated between the diaphragm 107 and the outer peripheral surface of the tube body 101, and it is necessary to apply a large driving force to the tube body 101.

  The present invention has been made by paying attention to the above-described problems, and can reduce the frictional force between the diaphragm and the outer peripheral surface of the tubular body and propel the tubular body toward the ground with a small force. An object is to provide a tubular body propulsion device.

  A tubular body propulsion apparatus according to the present invention includes a tubular body and a jack mechanism that is disposed at a position facing the rear end surface of the tubular body and that pushes the rear end surface of the tubular body to propel the tubular body toward the ground. The tube is pulled out on the outer peripheral surface of the tube from the outlet provided in the tube as the tube is propelled so that at least a part of the outer periphery of the tube is isolated from the ground. The diaphragm which reduces the frictional force between a pipe body and the ground, and the lubricant interposed between the said diaphragm and the outer peripheral surface of the said pipe body are provided.

  According to said structure, since the frictional force between a diaphragm and the outer peripheral surface of a tubular body reduces with a lubricant, it becomes possible to propel a tubular body toward the ground with small force.

  In preferable embodiment, the said diaphragm is accommodated in the state wound by roll shape in the accommodating part provided in the inside of the front end side of the said tubular body.

  According to said structure, the diaphragm wound by roll shape is pulled out on the outer peripheral surface of a tubular body from the inside of an accommodating part.

  In a preferred embodiment, the lubricant is discharged between the diaphragm and the outer peripheral surface of the tubular body by a lubricant discharge mechanism.

  In a preferred embodiment, the lubricant discharge mechanism includes a lubricant discharge device provided inside the tube body, and a discharge port provided on a rear end side of the tube body from the outlet, and the lubricant discharge device. Causes the lubricant to be discharged from the discharge port.

  Since the lubricant discharged from the discharge port is applied to the back surface of the diaphragm drawn out from the outlet to the rear end side, the lubricant is interposed between the diaphragm and the outer peripheral surface of the tubular body.

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

  According to said structure, a lubricant is widely apply | coated to the back surface of a diaphragm.

  In one embodiment, the lubricant discharge mechanism includes a groove formed along the width direction on the outer peripheral surface of the tubular body, and the groove communicates with the discharge port.

According to said structure, since the lubricant discharged from the discharge port is filled in the groove, it contacts the back surface of the drawn diaphragm and spreads between the outer peripheral surface of the tubular body and the back surface of the diaphragm. Thereby, a lubricant can be interposed over a wide range between the diaphragm and the outer peripheral surface of the tubular body.
Further, by adjusting the length of the groove to the entire length in the width direction of the diaphragm, the lubricant contacts the entire back surface of the diaphragm, and the lubricant is applied evenly on the back surface of the diaphragm.

  According to an embodiment, the lubricant ejection device includes a cylinder in which the lubricant is accommodated, a piston that is slidably provided inside the cylinder, and a drive unit that reciprocates the piston inside the cylinder. .

  According to said structure, a lubricant can be discharged from a discharge outlet by simple operation only to drive a piston.

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

  According to said structure, it is not necessary to provide a lubricant discharge mechanism separately in a pipe body.

  In a preferred embodiment, the lubricant comprises any one of grease, oil, polymer 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 tubular 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.

By mixing a rigid sphere with the lubricant, the frictional force between the diaphragm and the outer peripheral surface of the tube can be further reduced.
In addition, since the sphere is held on the outer peripheral surface of the tube due to the viscosity of the grease, it is possible to prevent the sphere from falling off even when a mixture is interposed between the side or bottom surface of the tube and the diaphragm. it can.

  The lubricant may be a mixture of grease and a rigid sphere, and a weight ratio of the grease to the sphere may be 0.3 or more and 3 or less, where the grease is 1.

  According to the present invention, the frictional force between the diaphragm and the outer peripheral surface of the tubular body can be reduced, and the tubular body can be propelled toward the ground with a small force.

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 front-end | tip part of a tubular body. It is a side view of the front-end | tip part of a tubular body. It is a front view of a tubular body. It is sectional drawing which expands and shows an accommodating part and a lubricant discharge mechanism. It is a perspective view of the front-end | tip part of a tubular body. It is a top view of the front-end | tip part of the tubular body which shows the other Example 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 having an outer periphery formed by a plurality of surfaces (four surfaces in this embodiment), and a tube A jack mechanism 104 disposed at a position opposite to the rear end surface of the body 20 to push the rear end surface of the tube body 20 and propel the tube body 20 toward the ground; and at least one surface of the outer periphery of the tube body 20 (this embodiment) As the tubular body 20 is propelled to the ground so that the upper surface and both side surfaces are isolated from the ground in the form, a thin plate-like diaphragm 30 drawn on the surface of the tubular body 20, and the diaphragm 30 and the tubular body 20 A lubricant R interposed between the outer peripheral surface and a lubricant discharge mechanism 60 that discharges the lubricant R between the diaphragm 30 and the outer peripheral surface of the tube body 20 is provided.

  In the following description, in FIG. 1, the direction propelled by the tube body 20 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 the two directions perpendicular to the front-rear direction are the vertical direction. And the width direction. Moreover, in the tubular body propulsion apparatus 10 of this embodiment, about the same structure as the prior art example shown in FIG. 10, detailed description is abbreviate | omitted by attaching | subjecting the same code | symbol to a corresponding structure.

The tube body 20 includes a blade mouth portion 21 and a tube body 22 provided continuously on the rear end side of the blade mouth portion 21. The blade opening 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 shaft on the reaching side.
The blade portion 21 includes a front end blade portion 211 and a rear end blade portion 212 whose front end side is continuous with the rear end surface of the front end blade end portion 211 and whose rear end side is connected to the tube body 22.

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

  The outer peripheral surface of the tube body 20 includes upper and lower surfaces and both side surfaces 211a to 211d of the front end blade portion 211, upper and lower surfaces and both side surfaces 212a to 212d of the rear end blade portion 212, and upper and lower surfaces and both side surfaces 22a of the tube body 22. ~ 22d are included.

  As shown in FIG. 3, the leading edge portion 211 has a shape in which the leading end portion is cut obliquely, so that the excavated earth and sand can be easily taken into the cutting edge portion 21.

On the inner side of the upper surface 211a of the leading edge portion 211, a concave accommodating portion 40 for accommodating the roll body 31 in a state where the diaphragm 30 is tightly wound is provided. As shown in FIG. 5, the opening of the upper surface (outer surface) of the accommodating portion 40 is covered with a cover body 42, leaving an outlet 41 for pulling out the diaphragm 30. The outlet 41 has an opening width and length corresponding to the thickness and width of the diaphragm 30, and is located at the rear end portion of the accommodating portion 40. The cover body 42 is attached by welding or the like so as to be continuous with the upper surface 211a of the tip blade portion 211.
The accommodating portion 40 has a width that is substantially the same as the width L1 of the upper surface 211a of the leading edge portion 211, and has an internal shape and size corresponding to the outer shape of the roll body 31. The container 40 in this embodiment has a rectangular cross-sectional shape, and the roll body 31 is easy to rotate by reducing the area where the outer peripheral surface of the roll body 31 is in contact with the inner wall of the container 40.

  The lower end (inner end) of the accommodating portion 40 is a loading / unloading opening 45 for the roll body 31, and the loading / unloading opening 45 is closed by a flat lid 43 in a state where the roll body 31 is accommodated in the accommodation portion 40. Yes. Specifically, 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 accommodating part 40, and the screw holes 47 of the flanges 40b and 40b are formed in the lid 43. Screw holes 49 and 50 are formed at positions corresponding to 48. The lid 43 is fixed to the front and rear collars 40b and 40b by tightening the screws 44 through the screw holes 49 and 50 of the lid 43 and the screw holes 47 and 48 of the collars 40b and 40b. The lid 43 also serves as a bottom plate that freely supports the roll body 40, and the upper surface 46 includes an upper surface 211 a of the leading edge portion 211, an upper surface 212 a of the trailing edge portion 212, and an upper surface 22 a of the tube body 22. Parallel.

  The width of the diaphragm 30 is slightly shorter than the width of the accommodating portion 40, and one roll body 31 is accommodated in the accommodating portion 40, but the diaphragm 30 is less than half the width of the side surface of the tubular body 20. The width | variety may be sufficient and it may be accommodated in the accommodating part 40 in the state with which two or more were continued.

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

  The diaphragm 30 is made of a metal thin film such as galvanized steel, but is not limited thereto, and may be made of a synthetic resin thin film such as vinyl chloride or polyethylene, or a carbon fiber woven thin film. .

  The lubricant discharge mechanism 60 includes a discharge port 61 provided on the rear end side from the outlet 41 of the tube body 20, a lubricant discharge device 62 provided inside the tube body 20 for discharging the lubricant R from the discharge port 61, and a tube It includes a groove 63 formed along the width direction on the outer peripheral surface of the body 20 (the upper surface 211a of the distal end blade portion 211 in FIG. 5) and communicating with the discharge port 61. The discharge port 61 opens to the bottom surface 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 length direction of the groove 63. However, the present invention is not limited to this. 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 the lubricant R, a piston 65 that is slidably provided inside the cylinder 64, and drive means 66 that reciprocates the piston 65 within the cylinder 64. The tip end of the cylinder 64 communicates with the discharge port 61 via a tube 67 and 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 reciprocates the piston 65 with a rod 66a.

The lubricant R includes one selected from the group consisting of grease, oil, a polymer lubricant, and a mixture of grease and a rigid sphere. The polymer lubricant includes, for example, an emulsion made of a polymer material such as polyacrylamide and has lubricity.
In this embodiment, the lubricant R is a mixture of grease and a rigid sphere. The sphere of the mixture has such a rigidity that it is not deformed by the force received from the ground 109 when the tube 20 is propelled in the ground 109, and is made of metal such as steel, but is made of synthetic resin. May be. The sphere has a diameter of 0.3 mm or more and 3 mm or less, and the weight ratio between the grease and the sphere is 0.3 or more and 3 or less when the grease is 1. The grease retains the 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 tubular body 20. The lubricant R contacts the back surface of the diaphragm 30 through the opening of the groove 63 and spreads between the diaphragm 30 and the outer peripheral surface of the tubular body 20.

  Note that the lubricant discharge device 62 is not limited to the above configuration, and may be any configuration as long as the lubricant R can be discharged from the discharge port 61. For example, it may be composed of a tank that stores the lubricant R, a tube 67 that connects the tank and the discharge port 61, and a pump that is 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 on the bottom surface of the groove 63, and a tube 67 connected to one lubricant discharge device 62 may be communicated with each discharge port 61. Note that the lubricant discharge device 62 may be provided for each discharge port 61. In this way, by providing a plurality of discharge ports 61, the lubricant R can be uniformly filled in the grooves 63 in a short period of time.
In this embodiment, the discharge port 61 is provided on the bottom surface of the groove 63, but may be provided on the side surface of the groove 63.

  Furthermore, the groove 63 may not be provided, and one or a plurality of discharge ports 61 may be provided so as to open on the outer peripheral surface of the tube body 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 onto the outer peripheral surface of the tube 20, and the lubricant R moves between the moving diaphragm 30 and the tube 20. It spreads between the outer peripheral surfaces.

  As shown in FIGS. 2 and 3, the rear edge blade portion 212 has concave housing portions 40, 40 for housing the roll body 31 around which the diaphragm 30 is wound, on the inner sides of both side surfaces 212 c, 212 d in the width direction. Is provided. The widths of the accommodating portions 40, 40 on the both side surfaces 212c, 212d substantially coincide with the length in the vertical direction of the side surface of the rear end blade portion 212. Further, a lubricant discharge mechanism 60 is provided inside each of the 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 portion of the groove 63. The lubricant R, which is a mixture of grease and sphere, 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 center part of the length direction of the groove | channel 63. FIG.

  The storage unit 40, the roll body 31 stored in the storage unit 40, and other configurations of the lubricant discharge mechanism 60 are the storage unit 40, the roll body 31, and the lubricant discharge formed on the upper surface 211 a of the leading edge portion 211. Since it is the same as the mechanism 60, the detailed description is abbreviate | omitted by attaching | subjecting the same code | symbol to corresponding structure.

  When the lubricant R is oil or a polymer lubricant, the discharge port 61 is opened at the upper ends 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 the side surfaces 212c and 212d 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 starting the work. When the work is started and the tube body 20 is pushed by the jack mechanism 104 and propelled 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 housing portion 40. It is sequentially pulled out on the outer peripheral surface of the body 20. In the present embodiment, the diaphragm 30 of the roll body 31 provided in the front end blade portion 211 is drawn out on the upper surface 212 a of the rear end blade end portion 212 and on the upper surface 22 a of the tube body 22. The diaphragm 30 of the roll body 31 provided inside is pulled out on the side surfaces 212b and 212c of the rear end blade opening 212 and on the side surfaces 22b and 22c of the tube main body 22, respectively.

  The diaphragm 30 is pulled out while the back surface is in contact with the lubricant R 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 propelled toward the ground with a small force.

  Thus, since it becomes possible to propel the tubular body 20 toward the ground with a small force compared to the case where the lubricant R is not interposed, the small jack mechanism 104 having a small maximum propulsive force can be used. Since the jack mechanism 104 is small, the start side shaft 100 can be small. Further, since the propulsive force of the jack mechanism 104 is small, the reaction force is also small, and the reaction force body 111, the shaft 112, and the supplementary reaction force pile 113 provided in the prior art shown in FIG. Further, the size of the crane for installing the jack mechanism 104 to the shaft 100 is reduced, and the number of trucks for transporting equipment and the like is reduced. Therefore, it is possible to greatly reduce the cost related to the tube propulsion work.

  Further, when the tube body 20 is pushed toward the ground by being pushed by the jack mechanism 104, the winding end of the diaphragm 30 of the roll body 31 is pulled out from the outlet 41 provided in the housing portion 40. Since the diaphragm 30 is led out from the outlet 41 in the vertical direction with respect to the bottom surface portion 46 of the accommodating portion 40, the roll body 31 is pushed up from the bottom surface portion 46 of the accommodating portion 30, and the frictional force between the diaphragm 30 and the bottom surface portion 46. And the diaphragm 30 can be pulled out while loosening the winding of the roll body 31. Further, since the roll body 31 is not pressed against the front surface 40a and the rear surface 40a of the accommodating portion 40, the frictional force between the diaphragm 30 and the front and rear walls 40a is small, and the roll body 31 is wound by this frictional force when the diaphragm 30 is pulled out. It is difficult to tighten. For this reason, a large force is not required for pulling out the diaphragm 30, the pulling out of the diaphragm 30 becomes smooth, and the tubular body 20 can be pushed 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 in the center portion in the width direction of the outer peripheral surface of the tubular body 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 is interposed between a part of the back surface of the diaphragm 30 and the outer peripheral surface of the tube body 20, the frictional force between the diaphragm 30 and the outer peripheral surface of the tube body 20 is larger than when the lubricant R is not interposed. To reduce.

  In this embodiment, the lubricant discharge mechanism 60 is provided and the lubricant R is discharged between the diaphragm 30 and the outer peripheral surface of the tube body 20. However, the lubricant is not provided as the lubricant discharge mechanism 60 but is used as the roll body 31. You may use what apply | coated R to the back surface of the diaphragm 30 previously.

FIG. 8 shows another embodiment. In the embodiment shown in FIG. 8, the tubular body 20 is cylindrical. In addition, the blade edge portion 21 is not divided into a front edge blade portion 211 and a rear edge blade edge portion 212, and has a cylindrical shape. A plurality of accommodating portions 40 (six in FIG. 8) are provided in the circumferential direction over an angular range in which the central angle α is 45 degrees to the left and right with respect to the vertical direction on the inner side of the upper peripheral surface of the blade portion 21. Are provided at equiangular intervals. The width | variety of the diaphragm 30 which comprises the roll body 31 accommodated in the accommodating part 40 and the accommodating part 40 is set short enough so that the internal peripheral surface of the blade edge part 21 can be met. In addition, a lubricant discharge mechanism 60 is provided inside the tubular body 20 for each storage unit 40.
Other configurations are the same as those in the embodiment of FIG.
Even in the above embodiment, since the lubricant R is interposed 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 becomes possible to propel the tubular body 20 toward the ground with a small force. Further, a large force is not required to pull out the diaphragm 30, and the diaphragm 30 can be pulled out smoothly.

Experimental example

In the tubular body propulsion apparatus 10 shown in FIGS. 1 to 6 of the present invention, a friction force measurement experiment was performed for 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 that simulated the diaphragm 30 of the present invention and the outer peripheral surface of the tube 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 parallelepiped base 81 on one end side in the length direction (left side in FIG. 9). The fixed plate 84 is obtained by placing the plate 83 on the upper surface of the support member 82. After applying the lubricant R on the upper surface of the plate 83, a plated steel plate 85 having the same width as the fixed plate 84 and slightly longer than the fixed plate 84 was placed. A weight 86 having a length of 1 m and a weight of 94 kg was placed on one end side in the length direction on the upper surface of the plated steel plate 85. A hydraulic cylinder 88 is connected via a load cell 87 to the other end side of the plated steel plate 85 in the length direction (right side in FIG. 9) and protruding from the fixed plate 84. The hydraulic cylinder 88 was placed on the base 81 by a support member 89 so as to be horizontal with the plated steel plate 85.

  The plated steel plate 85 was pulled by a hydraulic cylinder 88 at a speed of about 1 m / min for 30 seconds, the load during this period was measured by a load cell 87, and an average value was calculated (referred to as average load). The upper surface of the plate 83 of the fixed plate 84 of the experimental device 80 corresponds to the outer peripheral surface of the tubular body 20 of the present embodiment, and the plated steel plate 85 of the experimental device 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 experimental device 80 corresponds to the frictional force between the diaphragm 30 and the outer peripheral surface of the tubular body 20.

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

  The experimental results are shown in the table. When the lubricant R of the comparative example is not used, the average load is 0.263 kN, and when this is 100%, the experimental example 1 has an average load of 73.4%, the experimental example 2 has 89.0%, and the experimental example. 3 had an average load of 66.2% and Experimental Example 4 was 50.2%. In Experimental Examples 1 to 4, the average load decreased compared to the Comparative Example. In the tubular body 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 tubular body 20 is reduced by using the lubricant R. In particular, in Experimental Example 4, the average load decreased to about half that of the comparative example. It was found that the friction force is reduced by mixing a rigid sphere with grease.

DESCRIPTION OF SYMBOLS 10 Tube propulsion apparatus 20 Tube 21 Blade edge part 211 Front edge blade part 212 Rear edge blade part 22 Pipe body 30 Diaphragm 40 Storage part 41 Drawer 60 Lubricant discharge mechanism 61 Discharge port 62 Lubricant discharge apparatus 63 Groove 64 Cylinder 65 Piston 66 Driving means 100 Starting shaft 102 Propulsion platform 103 Reaction force pile 104 Jack mechanism 109 Ground 120 Track R Lubricant

Claims (9)

A prismatic tube,
A jack mechanism disposed at a position facing the rear end surface of the tubular body, and pushing the rear end surface of the tubular body to propel the tubular body toward the ground;
As the tube is propelled so that at least the upper surface and both sides of the outer periphery of the tube are isolated from the ground, the tube is pulled out from at least the upper surface and both sides of the tube from the outlet provided in the tube. A diaphragm for reducing the frictional force between the tube body and the ground,
A lubricant interposed between the diaphragm and at least the upper surface and both side surfaces of the tubular body;
With
The lubricant, Ri mixture der the sphere with grease and rigidity, the sphere has a diameter of 0.3mm or more, the tube propulsion device is 3mm or less. A prismatic tube,
A jack mechanism disposed at a position facing the rear end surface of the tubular body, and pushing the rear end surface of the tubular body to propel the tubular body toward the ground;
As the tube is propelled so that at least the upper surface and both sides of the outer periphery of the tube are isolated from the ground, the tube is pulled out from at least the upper surface and both sides of the tube from the outlet provided in the tube. A diaphragm for reducing the frictional force between the tube body and the ground,
A lubricant interposed between the diaphragm and at least the upper surface and both side surfaces of the tubular body;
With
The lubricant, Ri mixture der the sphere with grease and rigidity, the weight ratio of the said grease spheres when the grease and 1, 0.3 or more, the tube propulsion device 3 or less. The tubular body propulsion device according to claim 1 or 2 , wherein the diaphragm is housed in a state of being wound in a roll shape in a housing portion provided inside the distal end side of the tubular body. The tube propulsion apparatus according to claim 1 or 2 , wherein the lubricant is discharged between the diaphragm and at least an upper surface and both side surfaces of the tube by a lubricant discharge mechanism. The lubricant discharge mechanism includes a lubricant discharge device provided inside the tube body, and a discharge port provided on the rear end side of the pull-out port of the tube body, the lubricant discharge device from the discharge port The tubular body propulsion apparatus according to claim 4 , wherein the lubricant is discharged. The tube propulsion apparatus according to claim 5 , wherein a plurality of the discharge ports are provided in the tube body along a width direction. The lubricant discharge mechanism comprises at least an upper surface and a groove formed along the width direction on both sides of the tubular body, the groove according to claim 5 or 6 in communication with the discharge port Tube propulsion device. The lubricant discharge device is
A cylinder containing the lubricant;
A piston slidably provided inside the cylinder;
The tube propulsion apparatus according to claim 5 , further comprising a driving unit that reciprocates the piston inside the cylinder. The tube propulsion apparatus according to claim 1 or 2 , wherein the lubricant is applied in advance to the back surface of the diaphragm.