JP4445379B2 - Pipe burial construction equipment - Google Patents

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 body burying construction apparatus, as described in Patent Document 1, for example, 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 movable carriage with a propulsion jack while carrying it back 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-described object, the pipe embedding construction apparatus according to the present invention includes a square steel pipe having a rectangular cross section in which the front end opening is formed in the blade tip as described in claim 1. A pipe burial construction apparatus comprising a pipe body to be propelled, excavating means for excavating the front ground of the pipe, a conveying means for discharging the excavated material back through the pipe body, and a propelling means for the pipe body. The transporting means is a cylindrical body made of a round steel pipe having a circular cross section, which is arranged in the tubular body so as to be rotatable coaxially with the tubular body and configured to connect the rear end to the rotational driving means , An outer spiral blade and an inner spiral blade fixed to the outer peripheral surface and the inner peripheral surface of the cylindrical body over the entire length, respectively, and the excavation means includes a plurality of cutter bits fixed to the front surface. The arm member radiates radially from the center of the front end opening of the cylinder. Protruding and integrally fixing the outer ends of these arm members to the opening end of the cylindrical body, and forming a space between adjacent arm members in the circumferential direction in a gravel intake opening through which gravel can pass to be further at least in the peripheral wall of the front side of the cylinder, sediment out forming a sediment mixed in gravel by the space portion between the inner peripheral surface of the outer peripheral surface and the tube of the cylindrical body A plurality of earth and sand passage holes to be discharged to the passage are provided at predetermined intervals in the circumferential direction and the length direction, and the gravel discharged from the rear of the cylinder by the inner spiral blades at the rear end of the cylinder is discharged. While providing an outlet, the rear end wall of the tubular body communicates with the gravel discharge port and discharges the earth and sand transported rearward in the sediment transport passage by the outer spiral blade from the gravel discharge port. and characterized in that there is provided a drilling product discharge outlet for discharging to the outside together with the gravel being That.

In the pipe embedment construction apparatus configured as described above, in the invention according to claim 2 , earth and sand or gravel enters the earth and sand discharge passage between the outer peripheral surface of the front end of the cylinder and the inner peripheral face of the front end of the pipe. It is characterized in that a blocking wall is provided to prevent this.

Further, the invention according to claim 3, inclined obliquely rearward toward the front end opening of the cylindrical body from the front end opening of the tubular body is integrally fixed to the front end opening of the tube to the outer peripheral end of the blocking wall The structure is made to be.

Moreover, the invention which concerns on Claim 4 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 excavation means which excavates the pipe body which is propulsion | buried under the ground which consists of a square steel pipe of the cross-sectional rectangle shape which forms the front-end opening part in the blade edge | tip part, and the front ground of a pipe body And a pipe body embedding apparatus comprising a conveying means for discharging the excavated material back through the pipe body, and a propelling means for the pipe body, the conveying means rotating coaxially with the pipe body in the pipe body A cylindrical body made of a round steel pipe having a circular cross section, which is arranged freely and has a rear end connected to the rotation driving means, and is fixed to the outer peripheral surface and the inner peripheral surface of the cylindrical body over the entire length. The excavating means is composed of an outer spiral blade and an inner spiral blade, and the excavating means projects a plurality of arm members, each having a number of cutter bits fixed to the front, radially from the center of the front end opening of the cylindrical body. The outer ends of these arm members are integrated with the opening end of the cylindrical body. Since the space between the arm members adjacent in the circumferential direction with being worn by gravel forms gravel intake opening can pass, if the gravel is present in a drilling front ground of the tube, the Gravel can be smoothly and reliably carried out backward in the cylinder by the inner spiral blade that takes in the gravel into the large-diameter cylinder and adheres to the inner peripheral surface of the cylinder as the cylinder rotates.

Furthermore, the earth and sand which discharge | emit to the said earth and sand carrying-out channel | path formed by the space part between the outer peripheral surface of a cylinder, and the inner peripheral surface of a pipe | tube at the surrounding wall part at the front part side at least of the said cylinder While providing a passage hole, the rear end portion of the cylinder body is provided with a gravel discharge port to be carried out backward by the inner spiral blades, while the rear end wall portion of the pipe body has Since there is an excavated material discharge port that communicates with the gravel discharge port and discharges the earth and sand transported backward in the sediment transport passage by the outer spiral blade together with the gravel discharged from the gravel discharge port , simultaneously with and sieving sand taken into the cylinder body from the gravel unloaded sediment discharge passage from the sand passage hole, the excavation soil by the outer spiral blade due to the rotation of the cylindrical body can be reliably carried out at the rear By the inner spiral blade The then out to the rear through the tubular body as described above can be discharged from the gravel outlet, be discharged to the outside from the excavated material discharge port is provided on the rear tube wall of the tube with excavated soil it can. Therefore, the pipe body can be efficiently embedded without interrupting the propulsion and burying work of the pipe body.

According to the second 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 3 , 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.

According to the invention according to claim 4 , 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 buried in the ground is a square steel pipe having a rectangular cross section having a fixed length. For example, the length is 5250 mm, the thickness of the pipe wall is 19 mm, and the outer diameter is 900 mm × 900 mm square. It is formed in size. 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, but can receive gravel with a large diameter and feed it backward. 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 between the inner peripheral surface of the tube 1 and the outer peripheral surface of the cylinder 3a is formed in the earth and sand carry-out passage 6, and the spiral blade fixed to the outer surface of the cylinder 3a in the earth and sand carry-out passage 6 3b protrudes. 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.

  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 gap | interval space | interval between surfaces, ie, the width | variety of the said earth-and-sand carrying-out channel | path 6. FIG. 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. The blocking wall 10 is fixed integrally with the rectangular outer peripheral edge to the open end of the tube 1, it is as a mounting structure to separate the circular inner peripheral end from the open end of the cylindrical body 3a.

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, as the blocking wall 10, the small spacing the shape of the outer peripheral end of the opening end and university This tube 1, is formed in a rectangular shape having the same shape, the inner peripheral end to the open end of the tubular body 3a In the shape of a circular hole that can be surrounded and inclined obliquely rearward from the outer peripheral end toward the inner peripheral end, the rectangular outer peripheral end of the tubular body 1 is formed. It is integrally fixed to the opening end, and is arranged in a state where a circular hole is brought close to the opening end of the cylinder 3a.

  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 drive 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 on 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 embodiment, the front end opening of the earth and sand carry-out passage 6 between the tube 1 and the cylinder 3a is closed by the blocking wall 10, but as shown in FIG. 4, the front end of the cylinder 3a Of the earth and sand carrying-out passage 6 by expanding the portion in a trumpet shape toward the inner peripheral surface of the front end opening portion of the tubular body 1 and bringing the opening end close to or in sliding contact with the inner peripheral surface of the opening end portion of the tubular body 1. The open end may be closed. 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 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 provided 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 cylindrical body 3a is integrally mounted.

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 embodiment which does not provide the shielding wall.

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 (4)

A pipe body that is propelled and embedded in the ground consisting of a rectangular steel pipe with a rectangular cross section having a front end opening formed at the blade edge part, excavation means for excavating the front ground of the pipe body, and the excavated material to the rear through the pipe body and conveying means for discharging, a buried installation device tubular body comprising a propulsion means of the tube, said conveying means, and the rear end is rotatably disposed in this tube and coaxially with the tube body A cylindrical body made of a round steel tube having a circular cross section configured to connect the rotary driving means, and an outer spiral blade and an inner spiral blade fixed to the outer peripheral surface and the inner peripheral surface of the cylindrical body over the entire length, respectively. The excavating means includes a plurality of arm members, each having a number of cutter bits fixed to the front surface, radially projecting from the center of the front end opening of the cylindrical body in a radial direction. The end is firmly fixed to the open end of the cylinder and The space between the arm members adjacent become formed into gravel intake opening can pass is gravel, the further the peripheral wall of at least the front side of the cylindrical body, the earth and sand mixed in gravel a plurality of sand passage hole for discharging the sediment discharge passage formed by the space between the inner circumferential surface of the outer peripheral surface of the cylindrical body and the tube in the circumferential direction and the length direction with are provided at predetermined intervals, the cylinder A gravel discharge port is provided at the rear end portion of the body to be conveyed backward by the inner spiral blades, while the rear end wall of the tube communicates with the gravel discharge port and the outer side. A pipe embedding construction apparatus, characterized in that a drilling material discharge port is provided for discharging the earth and sand conveyed backward in the earth and sand carrying-out passage by a spiral blade together with the gravel discharged from the gravel discharge port . 2. The pipe according to claim 1, wherein 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 to prevent sediment and gravel from entering the sediment discharge passage. Body embedding equipment. 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 embedding apparatus according to claim 1 or 2 .   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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