JP2006183315A - Pipe burial construction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To discharge a gravel together with excavated earth and sand without clogging the opening end of the pipe when the pipe is propelled and buried in the ground while excavating the front ground of the pipe. The pipe construction apparatus which can embed can be provided.
SOLUTION: A cylindrical body 3a having a drilling means 2 comprising a cutter head attached to the front end and spiral blades 3b, 3c attached to the inner and outer peripheral surfaces thereof is rotatably arranged in the tubular body 1 and this cylindrical body 3a. The pipe 1 is propelled by excavating the ground in the front while rotating, and when gravel is present, the gravel is taken into the cylinder 3a together with the earth and sand, and the sediment passing hole 7 provided in the front part of the cylinder 3a. Only the earth and sand are discharged to the earth and sand carry-out passage between the pipe body 1 and the cylinder 3a and are carried out backward by the outer spiral blade 3b, while the gravel in the cylinder 3a is carried backward by the inner spiral blade 3c and removed. It is configured as follows.
[Selection] Figure 1

Description

  TECHNICAL FIELD The present invention relates to a pipe burial apparatus for propelling and burying a pipe body in the ground while excavating the front ground of the pipe body.

Conventionally, as this type of pipe burial construction apparatus, for example, as described in Patent Document 1, a screw auger is rotatably inserted into a pipe body to be buried in the ground, and this screw auger is started. It is rotated by means of rotational drive installed on a longitudinally moving carriage arranged on the shaft side, excavating the ground in front, and the excavated earth and sand is spirally bladed by the screw auger and the auger shaft of the screw auger There has been known an apparatus for embedding a pipe body in the ground by advancing the front and rear moving carriage with a propulsion jack while carrying it backward through a gap between the outer peripheral surfaces of the pipe.
Japanese Patent Publication No. 3-14994

  However, according to the above apparatus, when the pipe body in which the screw auger is mounted is propelled into the ground and the ground is excavated by the screw auger, the gravel with a large diameter is removed from the pipe body. When entering the open end, the gravel can be transported rearward by the spiral blade attached to the outer peripheral surface of the auger shaft clogged in the gap between the inner peripheral surface of the tube and the auger shaft of the screw auger. It becomes impossible and the inside of the pipe is blocked by the large-diameter gravel so that further excavation becomes difficult.

  For this reason, when gravel is clogged at the open end of the tube during propulsion and embedment, after the screw auger is pulled out to the start shaft side, an operator enters the tube to crush and remove the gravel. After that, the current situation is that the screw auger is inserted into the pipe body and mounted again to carry out the propulsion and burying work of the pipe body, and the work loss time becomes longer and the construction period becomes longer. There is a problem.

  The present invention has been made in view of such problems, and the object of the present invention is to remove excavation means and the like even if gravels exist while burying the pipe body while excavating the ground in front. Therefore, it is intended to provide a pipe burial apparatus that can efficiently embed a pipe body by taking the gravel into the interior and separating it from the earth and sand so that it can be discharged backward.

  In order to achieve the above object, a pipe burial construction apparatus according to the present invention includes, as described in claim 1, a pipe body that is propelled and buried in the ground, and excavation means that excavates the front ground of the pipe body. An apparatus for embedment of a tubular body comprising conveying means for discharging the excavated material back through the tubular body, and propelling means for the tubular body, wherein the conveying means is rotatable coaxially with the tubular body within the tubular body And a spiral blade fixed to the outer peripheral surface of the cylinder, and the cylinder has the excavation means integrally attached to the front end opening thereof and the gravel that has passed through the excavation means Has an inner diameter that can be taken into the interior from the opening end and can be carried out rearward. Further, at least the front wall of the cylindrical body has sand and sand mixed with gravel on the outer peripheral surface of the cylindrical body and the tubular body. Sediment passage hole for discharging in the sediment transport passage between the inner peripheral surfaces and the rear end of the cylinder It is provided with a gravel outlet, and configured to connect the rear end of the cylindrical body to a rotary drive means.

  In the pipe embedding construction apparatus configured as described above, the invention according to claim 2 is characterized in that an inner spiral blade for feeding gravel backward is fixed to the inner peripheral surface of the cylindrical body.

  Furthermore, the invention according to claim 3 is characterized in that a blocking wall is provided between the outer peripheral surface of the front end of the cylindrical body and the inner peripheral surface of the front end of the tubular body. The outer peripheral end is integrally fixed to the front end opening of the tubular body and is inclined obliquely rearward from the front end opening of the tubular body toward the front end opening of the tubular body.

  Moreover, the invention which concerns on Claim 5 has the structure which expanded the front-end part of the said cylindrical body in the trumpet shape toward the internal peripheral surface of the front-end opening part of a tubular body.

  According to the invention which concerns on Claim 1, the pipe body propelled and buried in the ground, the excavation means for excavating the front ground of the pipe body, the transport means for discharging the excavated material back through the pipe body, An apparatus for embedment of a tubular body comprising propulsion means, wherein the conveying means is fixed to the outer peripheral surface of the cylindrical body, which is disposed in the tubular body so as to be rotatable coaxially with the tubular body. The cylindrical body has an inner diameter in which the excavation means is integrally attached to the opening of the front end and the gravel that has passed through the excavation means can be taken into the inside from the opening end and taken out backward. Therefore, when gravel is present during excavation of the front ground of the pipe body, this gravel can be taken into the large-diameter cylindrical body and discharged backward, and therefore the cylindrical body provided with the spiral blades can be discharged. The narrow sediment transport passage between the outer peripheral surface and the inner peripheral surface of the pipe is clogged with gravel. It is possible to go smoothly embedded in the construction of the tube without the.

  Further, at least the front wall side of the cylindrical body is provided with a sand and sand passage hole through which the sand and sand mixed in the gravel is discharged into the earth and sand carrying passage between the outer peripheral surface of the cylindrical body and the inner peripheral surface of the tubular body. Since the gravel discharge port is provided at the rear end of the cylinder, the earth and sand taken into the cylinder together with the gravel is screened from the gravel and discharged from the discharge hole into the earth and sand discharge passage. The spiral blades can surely carry out rearward and the gravel can be removed rearward through the cylinder and discharged from the gravel outlet. Therefore, the pipe body can be efficiently embedded without interrupting the propulsion and burying work of the pipe body.

  Further, according to the invention according to claim 2, since the inner spiral blade for feeding the gravel backward is fixed to the inner peripheral surface of the cylindrical body, the inner spiral blade is fixed to the outer peripheral surface of the cylindrical body according to the rotation of the cylindrical body. As described above, the excavated earth and sand can be carried backward by the spiral blade, and at the same time, the gravel can be smoothly and reliably carried backward in the cylinder by the inner spiral blade.

  According to the third aspect of the present invention, the barrier wall is provided between the outer peripheral surface of the front end of the cylindrical body and the inner peripheral surface of the front end of the tubular body. It is possible to reliably prevent all the excavated earth and sand from being introduced into the large-diameter cylinder together with the gravel as well as to remove the excavated earth and sand from the cylinder as described above. It is possible to discharge through the earth and sand passage hole provided in the peripheral wall of the earth and sand to bypass the earth and sand carry-out passage between the tube and the cylinder, and reliably prevent clogging of the open end of the earth and sand carry-out passage due to gravel Can do.

  In this case, as described in claim 4, the outer peripheral end of the blocking wall is integrally fixed to the front end opening of the tube, and the blocking wall is directed from the front end opening of the tube toward the front end opening of the tube. By inclining obliquely rearward, excavated earth and sand, gravel and the like can be smoothly and reliably introduced into the opening end of the cylindrical body by the inclined surface of the blocking wall.

  Further, according to the invention according to claim 5, since the front end portion of the cylindrical body is expanded in a trumpet shape toward the inner peripheral surface of the front end opening portion of the tubular body, Can be efficiently taken in and discharged.

  A specific embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, an embedding construction apparatus for propelling and embedding a pipe body 1 in the ground excavates the front ground of the pipe body 1. The excavating means 2 for conveying the excavated material such as excavated earth and sand through the pipe body 1, and the propelling means 4 for the pipe body 1. The tubular body 1 embedded in the ground may be a round steel pipe having a circular section having a certain length, but in the embodiment of the present invention, a rectangular steel pipe having a rectangular section having a certain length. As an example, the length is 5250 mm, the tube wall thickness is 19 mm, and the outer diameter is 900 mm × 900 mm square. In addition, the opening front end edge of this tube 1 is formed in the blade edge part.

  The conveying means 3 includes a cylindrical body 3a made of a cylindrical steel pipe that is rotatably disposed in the tubular body 1 with its axial center on the axial center of the tubular body 1, and an outer periphery of the tubular body 3a. The cylindrical body 3a is detachably connected to the rotational drive means 5 as will be described later, and is connected to the rotational drive means 5 as described later. It is comprised so that it can be rotated by. The length of the cylindrical body 3a is slightly shorter than that of the tubular body 1 and the outer diameter is smaller than that of the tubular body 1. However, the cylindrical body 3a can receive a large-diameter gravel and send it back. It is formed on the inner diameter. As an example, the tube wall has a thickness of 9 mm and an outer diameter of about 600 mm. A space portion having a circular cross section between the inner peripheral surface of the pipe body 1 and the outer peripheral surface of the cylinder 3a is formed in the earth and sand carry-out passage 6, and the earth and sand carry-out path 6 is formed on the outer peripheral surface of the cylinder 3a. The fixed spiral blade 3b is projected. The spiral blades 3b and 3c fixed to the inner and outer peripheral surfaces of the cylindrical body 3a project in the same spiral winding direction so that excavated materials such as earth and sand are conveyed backward by the rotation of the cylindrical body 3a.

  The excavating means 2 comprises a cutter head that is integrally attached to the front end opening of the cylindrical body 3a in the conveying means 3, and this cutter head has a plurality of arm members 2a having a number of cutter bits 2b fixed to the front surface. Projecting radially in the radial direction from the center of the front end opening of the cylindrical body 3a, and the outer ends of these arm members 2a are integrally fixed to the opening end of the cylindrical body 3a and adjacent to the circumferential direction. A space between the members 2a and 2a is formed in a gravel intake opening 2c through which gravel can pass. The cutter head is formed in a side cone shape with the center protruding forward and the tip sharply formed, but it may be formed so that the front surface is a vertical surface. Further, the excavating means 2 is not limited to such a cutter head, and for example, may be configured from a nozzle that excavates by jetting pressure water toward the front.

  A plurality of earth and sand passage holes 7 communicating from the inside of the cylinder 3a to the earth and sand carrying-out passage 6 are provided at predetermined intervals in the circumferential direction and the length direction on the front peripheral wall of the cylinder 3a. A gravel discharge port 8 having a diameter larger than that of the earth and sand passage hole 7 is provided in the rear end peripheral wall portion of the body 3a. An excavated material discharge port 9 communicating with the gravel discharge port 8 is provided. The excavated material discharge port 9 has the same diameter as the gravel discharge port 8 or a larger diameter than the gravel discharge port 8, while the earth and sand passage hole 7 has an inner peripheral surface of the outer tube 1 and an outer periphery of the cylindrical body 3 a. It is formed in the same space | gap or small diameter as the width | variety space | interval between surfaces, ie, the width of the said earth-and-sand carrying-out path | pass 6. The earth and sand passage hole 7 may also be provided on the rear side of the cylinder 3a.

  Further, in the front end opening of the pipe body 1, earth and sand, gravel, etc. enter the passage from the opening end of the earth and sand carry-out passage 6 between the front end inner peripheral surface of the pipe body 1 and the front end outer peripheral surface of the cylinder 3 a. A blocking wall 10 made of a plate material that prevents entry is provided. When the tube body 1 has a circular cross section like the cylindrical body 3a, the blocking wall 10 is fixed to the opening end of the tubular body 1 integrally with the outer peripheral end, while the inner peripheral end is separated from the cylindrical body 3a. Even if it is a mounting structure, the inner peripheral end thereof may be integrally fixed to the opening end of the cylindrical body 3a, while the outer peripheral end may be separated from the opening end of the tubular body 1. When 1 is a rectangular steel pipe having a rectangular cross section, the rectangular outer peripheral end is integrally fixed to the opening end of the tubular body 1, and the circular inner peripheral end is separated from the opening end of the cylindrical body 3a. It is set as a mounting structure.

  Further, the blocking wall 10 is inclined obliquely rearward from the front end opening of the tube 1 toward the front end opening of the cylinder 3a, and all excavated earth and sand etc. are placed along the inclined surface in the front end opening of the cylinder 3a. It is formed to be introduced. Specifically, when the tubular body 1 is made of a steel pipe having a rectangular cross section as described above, the shape of the outer peripheral end of the blocking wall 10 is the same size and rectangular shape as the opening end of the tubular body 1. It is formed in a shape, and the inner peripheral end is formed into a circular hole that can be surrounded by a small interval at the opening end of the cylindrical body 3a, and obliquely rearward from the outer peripheral end toward the inner peripheral end. An inclined shape having a rectangular outer peripheral end fixed integrally to the opening end of the tubular body 1 and a circular hole disposed close to the opening end of the cylindrical body 3a It is.

  The rear end opening of the cylindrical body 3a is closed by a circular end face plate 3d whose outer peripheral edge is integrally fixed to the opening end face, and the center of rotation 11 is directed rearward at the center of the circular end face plate 3d. The rear end of the rotation center shaft 11 and the front end of the rotation shaft of the rotation driving means 5 are detachably connected via a coupling 12. The coupling 12 includes a half portion 12a provided with a concave strip portion and a second half portion 12b provided with a convex strip portion detachably attached to the concave strip portion and the rear end of the rotation center shaft 11 and rotational drive means. 5 is fixed to the front end of the rotary shaft. The rotational drive means 5 comprises a rotational drive motor 5a and a speed reducer 5b. The rotation of the rotational drive motor 5a is transmitted to the speed reducer 5b, and the rotational center shaft 11 is rotationally driven via the speed reducer 5b. It is configured.

  Similarly to the cylindrical body 3a, the rear end opening of the tube 1 is closed by a circular end face plate 1a whose outer peripheral edge is integrally fixed to the opening end face, and the central portion of the circular end face plate 1a. A bearing 13 is fixed to the bearing 13, and the rotation center shaft 10 of the cylindrical body 3a is rotatably supported on the bearing 13.

  As shown in FIGS. 1 and 3, the rotational drive means 5 is installed on a front and rear movable carriage 14 disposed behind the tube body 1 with the rotational shaft of the rotational drive motor 5a facing forward. Further, the propulsion jacks 4a, 4a as the propulsion means 4 are installed on both sides of the front / rear moving carriage 14 in the front / rear direction, and the front ends of the propulsion jacks 4a, 4a are connected to the front / rear movement carriage 14 Connected to both end portions of the fixed wall plate 15 standing on and fixed to the upper end portion, and at the rear end side of the propulsion jacks 4a, 4a, between the tips of the piston rods of these propulsion jacks 4a, 4a The spreader 16 as a propulsive force transmission member is integrally connected to the piston rod, and the spreader 16 is brought into contact with the rear reaction wall 17 by extending the piston rod so that the front and rear movable carriage 14 is moved forward. .

  In order to propel and bury the pipe body 1 in the ground from the start shaft C side by the pipe burying construction apparatus constructed in this way, after the front and rear moving carriage 14 is disposed behind the pipe body 1, the propulsion means 4. By extending the piston rod of 4 propulsion jacks 4a, 4a, the spreader 16 at the rear end is brought into contact with the reaction wall 17 provided in contact with the rear wall of the starting shaft C, and the piston rod is further extended from this state. As a result, the forward / backward moving carriage 14 moves forward, and the rotational axis of the rotational drive means 5 installed on the forward / backward movement carriage 14 is coupled to the rear end rotation center axis of the cylinder 3a which is the conveying means 3 via the coupling 12. Directly connected to 11.

  In this state, when the rotation driving motor 5a of the rotation driving means 5 is operated to rotate the cylinder 3a and the piston rods of the propulsion jacks 4a and 4a are further extended, the reaction force wall 17 supports the propulsion reaction force. However, the propulsive force is transmitted to the tubular body 1 supporting the rotation center shaft 11 of the tubular body 3a, and the tubular body 1 is propelled integrally with the tubular body 3a while moving the forward and backward moving carriage 14 forward. The front ground is excavated by the cutter head which is the excavating means 4 provided at the front end of 3a. When the tubular body 1 is propelled, the forward earth and sand are taken into the open end of the tubular body 1 by the cutting edge formed at the open end of the tubular body 1 from the open end of the tubular body 1 toward the open end of the tubular body 3a. Then, it is introduced into the open end of the cylinder 3a together with the earth and sand excavated by the cutter head while being guided by the front surface of the blocking wall 10 inclined obliquely rearward. At this time, if gravel exists in the earth and sand, the gravel passes through the gravel intake opening 2c provided in the cutter head and is received together with the earth and sand in the cylinder 3a.

  The excavated sediment and gravel introduced into the cylindrical body 3a is conveyed rearward by the inner spiral blade 3c integrally provided on the inner peripheral surface of the cylindrical body 3a according to the rotation of the cylindrical body 3a. The earth and sand in the cylinder 3a falls into the earth and sand carrying-out passage 6 between the outer peripheral surface of the cylinder 3a and the inner peripheral surface of the tube 1 from the earth and sand passage hole 7 provided in the front peripheral wall of the cylinder 3a. At this time, since the earth and sand passage hole 7 is formed to have the same or smaller diameter as the inner and outer diameter direction of the earth and sand carrying-out passage 6, the large-diameter gravel is discharged from the earth and sand passage hole 7 into the earth and sand carrying-out passage 6. Excavated matter provided in the rear end peripheral wall of the tube 1 from the gravel discharge port 8 provided in the rear end peripheral wall of the cylindrical body 3a. It is discharged to the outside (in the start shaft C) through the discharge port 9.

  On the other hand, the earth and sand that has been screened from the gravel and discharged from the earth and sand passage hole 7 into the earth and sand carry-out passage 6 is moved rearward along the rotation of the cylinder 3a by the outer spiral blade 3b protruding from the outer peripheral surface of the cylinder 3a. It is conveyed and discharged to the outside together with gravel from the excavated material discharge port 9 provided in the peripheral wall of the rear end portion of the tube body 1.

  In this way, when the tube 1 is propelled for a certain length while rotating the cylinder 3a to excavate the ground in front, the piston rods of the propulsion jacks 4a and 4a as the propulsion means 4 are contracted, By extending a piston rod of the propulsion jacks 4a and 4a again by interposing a reaction force receiving member 17a having a thickness corresponding to the digging length of the tube body 1 between the reaction wall 17 and the reaction force wall 17, the tube body 1 is further extended to a certain length. By digging up and repeating this, the tubular body 1 is propelled and buried in the ground over substantially the entire length. In addition, when the length of the pipe line by the pipe body 1 to be buried in the ground is long, the pipe body 1 to be buried first is used as a leading conduit, and a cutting edge and a blocking wall 10 are provided in the pipe body 1. As the cylinders that are not provided with the excavation means 3 and the earth and sand passage hole 7 are used as the cylinders that are built in the pipes one after another, and are continuously added in the same manner as the pipes. Promote and bury it. After forming a predetermined length of the pipe, the cylinder is pulled out and removed.

  In the above-described embodiment, the front end opening of the earth and sand carrying-out passage 6 between the tube body 1 in which the outer spiral blade 3b of the tube body 3a is disposed and the tube body 3a is closed by the blocking wall 10. However, as shown in FIG. 4, the front end portion of the cylindrical body 3 a is expanded in a trumpet shape toward the inner peripheral surface of the front end opening portion of the tubular body 1, and the opening end is the inner peripheral surface of the opening end portion of the cylindrical body 1. It is good also as a state which closed the open end of the earth-and-sand carrying-out channel | path 6 by making it adjoin to or slide. In this case, if the tubular body 1 has a rectangular cross section, a blocking wall whose inner end surface is formed in a concave arc shape along the outer peripheral surface of the front end opening of the cylindrical body 3a may be fixed to its four corners. .

  Further, as the excavating means 2, several arm members 2a each having a plurality of cutter bits 2b projecting from the front are projected radially from the center of the opening end of the cylinder 3a, and the outer ends thereof are expanded. Alternatively, a structure may be adopted in which the front end opening is integrally fixed to the inner peripheral surface.

  In any of the above-described embodiments, the earth and sand passage hole 7 for sieving earth and sand from the gravel in the earth and sand and gravel taken into the cylinder 3a and discharging them to the earth and sand carry-out passage 6 outside the cylinder 3a. Although directly provided in the front part of 3a, as shown in FIG.5, FIG.6, it is constant toward the front-end outer peripheral surface of the cylinder 3a in the front-end part of the pipe body 1 for every small space | interval in the circumferential direction. A plurality of crosspiece members 18, 18... Project to form a gap between adjacent crosspiece members 18, 18 in the earth and sand passage hole 7 a, and the cylinder 3 a surrounded by these crosspiece members 18. The inside of the front end portion may be communicated with the front end portion of the earth and sand carry-out passage 6 between the outer peripheral surface of the cylindrical body 3a and the inner peripheral surface of the tube body 1 through the earth and sand passage hole 7a.

  In this case, the cutter head, which is the excavating means 2 disposed in the front end of the opening of the tube 1, is rearward at the outer ends of several arm members 2 a projecting radially from the front center of the cylinder 3 a. A support member 19 having a fixed length is provided so as to protrude toward the outer periphery, and the support member 19 is fixed to the outer peripheral surface of the front end opening of the cylindrical body 3a together with the crosspiece member 18.

  With this configuration, the earth and sand excavated by the cutter head enters the cylindrical space surrounded by the crosspiece member 18, and passes through the earth and sand passage hole 7a between the adjacent crosspiece members 18 and 18 to the front end of the earth and sand carry-out passage 6 It falls into the section, is conveyed rearward along with the rotation of the cylindrical body 3a, and is discharged to the outside from the excavated material discharge port 9 provided on the peripheral wall of the rear end portion of the tubular body 1. Gravel that has entered the cylindrical space surrounded by the crosspiece 18 through the gravel intake opening 2c between the adjacent arm members 2a and 2a of the cutter head is larger than the opening width of the earth and sand passage hole 7a. Since it has a large diameter, it enters the cylindrical body 3a without being screened off, and is conveyed rearward by the inner spiral blade 3c integrally provided on the inner peripheral surface of the cylindrical body 3a according to the rotation of the cylindrical body 3a. From the gravel discharge port 8 provided in the rear end peripheral wall of the cylinder 3a, it is discharged to the outside through the excavated material discharge port 9 provided in the rear end peripheral wall of the tube 1.

  In any of the above-described embodiments, the blocking wall 10 is provided between the outer peripheral surface of the front end of the cylinder 3a and the inner peripheral surface of the front end of the tubular body 1. However, without providing such a blocking wall 10, FIG. As shown in Fig. 2, the outer peripheral end of the arm member 2a of the cutter head which is the excavating means 2 is projected from the front end opening of the cylindrical body 3a toward the inner peripheral surface of the open end of the tubular body 1 to A structure may be adopted in which the front end opening of the earth and sand carrying-out passage 6 formed between the surface and the outer peripheral surface of the cylinder 3a is integrally attached.

The simplified vertical side view of the state which has buried the pipe body in the ground while excavating the front ground. The front view. The top view of a back-and-forth moving trolley part. The simple vertical side view of the principal part which shows another embodiment of this invention. The simple vertical side view of the principal part which shows another embodiment of this invention. The front view. The simple vertical side view of the principal part which shows embodiment which does not provide the shielding wall.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tube 2 Excavation means 3 Conveyance means
3a cylinder
3b, 3c spiral blade 4 propulsion means
4a Propulsion jack 5 Rotation drive means 6 Sediment transport passage 7 Sediment passage hole 8, 9 Discharge port
10 Barrier wall

Claims (5)

  Pipe embedment construction comprising a pipe body that is propelled and buried in the ground, a drilling means that excavates the ground in front of the pipe body, a conveying means that discharges excavated material through the pipe body, and a propelling means for the pipe body The conveying means comprises a cylindrical body disposed coaxially with the tubular body and rotatably disposed in the tubular body, and a spiral blade fixed to the outer peripheral surface of the tubular body. The excavation means is integrally attached to the front end opening, and has an inner diameter that allows gravel that has passed through the excavation means to be taken into the inside from the opening end and to be discharged backward, and at least the front side of the cylinder In the peripheral wall of the cylinder, there is provided a sediment passage hole for discharging sediment mixed in the gravel into the sediment transport passage between the outer peripheral surface of the cylinder and the inner peripheral surface of the tube, and at the rear end of the cylinder An outlet is provided, and the rear end of the cylinder is connected to the rotation drive means. Buried construction device of the tubular body, characterized in.   2. The tubular body embedding construction apparatus according to claim 1, wherein an inner spiral blade for feeding gravels backward is fixed to an inner peripheral surface of the tubular body.   The tube construction embedding apparatus according to claim 1, wherein a blocking wall is provided between a front end outer peripheral surface of the cylindrical body and a front end inner peripheral surface of the tubular body.   The blocking wall has an outer peripheral end fixed integrally to the front end opening of the tube, and is inclined obliquely rearward from the front end opening of the tube toward the front end opening of the tube. The pipe construction apparatus according to claim 1 or 3.   2. The pipe embedment construction apparatus according to claim 1, wherein a front end portion of the tubular body is expanded in a trumpet shape toward an inner peripheral surface of a front end opening portion of the tubular body.

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