JP6137617B2 - Excavation ring for sheath tube, sheath tube, and method of constructing sheath tube - Google Patents

Description

  The present invention relates to a sheath tube excavation ring, a sheath tube, and a method for constructing the sheath tube. Specifically, the present invention relates to an excavation ring for a sheath pipe for constructing a wellhead in a shaft, a sheath pipe, and a construction method for the sheath pipe.

  For example, when laying a sewer pipe, there is a propulsion method in which a main pushing device is installed in a starting vertical shaft, and the underground piping is sequentially pushed into the underground shaft while excavating the underground with an excavator.

  In this case, the vertical shaft has a length of about 6 to 8 m in which the length of the laying pipe, the length of the main pushing jack, and the thickness of the bearing wall are added to the margin in the propulsion direction.

  However, the dimensions in the propulsion direction may not be ensured due to road conditions or geographical conditions on the ground, and a sheath pipe larger than the laying pipe outer diameter is laid in the propulsion direction at the propulsion position of the shaft. .

  In installation of such a sheath pipe, a steel pipe having an outer diameter 30 to 50 cm larger than the outer diameter of the laying pipe is propelled about 2 m by open front type digging propulsion, and then a starting pit is attached to the tip of the steel pipe. However, there are cases where the ground is fragile, and even if the ground is improved by chemical injection or the like, manual digging cannot be promoted.

  In such a case, a sheath pipe with a start pit is attached to the outer periphery of the excavator equipped with an extendable cutter arm. Then, after the cutter arm is extended and propelled in accordance with the outer diameter of the sheath pipe, the excavator and the sheath pipe are separated, and the cutter arm of the excavator is contracted to match the original excavation diameter. There is a method of excavation.

  Here, as an excavator equipped with an extendable cutter arm, there is one described in Patent Document 1, for example. Specifically, as shown in FIG. 12, a movable spoke 103 that is movably attached to a fixed cutter spoke 102 of a cutter spoke 101, a hydraulic cylinder 104 that drives the movable spoke 103 to move forward and backward, and a fixed cutter The spoke 102 includes a bearing structure 105 that supports the movable spoke 103.

JP 2000-297596 A

  However, in the invention described in Patent Document 1, since the cutter arm is expanded and contracted by a hydraulic jack built in the cutter arm, the hydraulic device is damaged due to a heavy burden on the cutter arm in soil with hard ground or rolling stone. There is. In addition, the cutter arm may be distorted, making it impossible to expand and contract.

  In addition, it is not possible to use an excavator equipped with a cutter arm adapted to the outer diameter of the laying pipe for laying the sheath pipe. Using an excavator equipped with an inefficient work.

  The present invention was devised in view of the above points, and is provided with an excavation ring for a sheath tube, a sheath tube, and a sheath tube that can be installed in the existing excavator by being attached to the open end of the sheath tube. The purpose is to provide a construction method.

  In order to achieve the above-described object, a sheath tube excavation ring according to the present invention has a first diameter that is substantially the same as the outer diameter of the open end of the sheath tube and is rotatably attached in the circumferential direction of the open end. A cylindrical ring main body having a second open end formed at a position opposite to the first open end, and the sheath disposed at the second open end of the ring main body A mooring portion that can be moored to a rotary blade portion of an excavator stored in a pipe, and a drilling blade that protrudes from the second opening end toward the propelling direction of the sheath pipe.

Here, when the first opening end has substantially the same diameter as the outer diameter of the opening end of the sheath tube, the first opening end can be integrally attached to the opening end of the sheath tube.
Furthermore, the first open end can be rotated in the circumferential direction of the open end of the sheath tube by attaching the first open end so as to be rotatable in the circumferential direction of the open end of the sheath tube.

  In addition, since the ring body has a cylindrical shape having a second opening end formed at a position facing the first opening end, the ring body can be integrally disposed on the coaxial line with the sheath tube.

  Further, the ring main body is made to follow the rotary blade portion of the excavator by a mooring portion arranged at the second opening end of the ring main body and capable of being anchored to the rotary blade portion of the excavator stored in the sheath tube. It can be rotated.

  In addition, by providing a drilling blade projecting in the propelling direction of the sheath tube at the second opening end, it becomes possible to dig a hole having the same diameter as the sheath tube.

  Moreover, in the excavation ring for a sheath pipe according to the present invention, when the mooring portion has a recess in which the tip of the rotary blade portion can be inserted and the first opening end side is formed in an open shape, By retreating, it becomes possible to release the mooring between the excavation ring for the sheath pipe and the excavator.

  Further, in the excavation ring for sheath pipe according to the present invention, when the rotary machine is provided with a rotating roller attached to the first opening end and capable of rotating around the distal end opening end of the sheath pipe, when propelling the excavator In addition, the sheath tube excavation ring can be smoothly rotated with respect to the open end of the sheath tube.

  In order to achieve the above object, the sheath pipe according to the present invention maintains a predetermined distance from the outer peripheral surface of the excavator, and the excavator along the circumferential direction of the inner peripheral surface near the opening end. A sheath tube main body having a wellhead packing attached so that the outer peripheral surface is in close contact with the outer diameter of the open end of the sheath tube main body, and rotatable in the circumferential direction of the open end A cylindrical ring body having a first opening end to be attached, a second opening end formed at a position opposite to the first opening end, and the second opening end of the ring body A mooring portion that can be moored to the rotary blade portion of the excavator stored in the sheath tube main body and the second opening end are provided to project in the propulsion direction of the sheath tube main body. And a drilling ring for a sheath pipe having a drilling blade.

  Here, it has a wellhead packing attached so that the outer peripheral surface of the excavator is in close contact along the circumferential direction of the inner peripheral surface in the vicinity of the opening end while maintaining a predetermined distance from the outer peripheral surface of the excavator The sheath pipe body makes it possible to hold the sheath pipe body in the excavator while preventing excavation soil from flowing between the excavator and the sheath pipe body during excavation.

  Further, since the first opening end has substantially the same diameter as the outer diameter of the opening end of the sheath tube body, the first opening end can be integrally attached to the opening end of the sheath tube body.

  In addition, the first opening end can be rotated in the circumferential direction of the opening end of the sheath tube main body so that the first opening end can be rotated in the circumferential direction of the opening end of the sheath tube body. it can.

  Moreover, the ring body can be integrally disposed on the coaxial line with the sheath tube body by having a cylindrical shape having a second opening end formed at a position facing the first opening end. .

Also, the ring is arranged along the second opening end of the ring body and can be moored to the rotary blade portion of the excavator stored in the sheath tube so that the ring follows the rotary blade portion of the excavator. The main body can be rotated.

  In addition, by providing a drilling blade projecting in the propelling direction of the sheath tube at the second opening end, it becomes possible to dig a hole having the same diameter as the sheath tube.

  Moreover, in order to achieve said objective, the construction method of the sheath pipe which concerns on this invention is the step which provides a hole part in a shaft retaining wall, and hold | maintains a predetermined space | interval with the outer peripheral surface of an excavation machine in this hole part A step of excavating the sheath pipe through a sheath pipe having a sheath pipe excavation ring provided with a drilling blade which is moored and rotated by the rotary blade portion of the excavator, the sheath pipe excavation ring and the excavator And the step of releasing the mooring with the rotary blade portion and leaving the sheath tube in the soil.

  Here, a hole provided in the shaft retaining wall has a drilling ring for a sheath pipe provided with a drilling blade which is held at a predetermined distance from the outer peripheral surface of the excavator and is moored and rotated by the rotary blade of the excavator. Through the process of excavating the soil by inserting the sheath pipe, it is possible to propel the sheath pipe while excavating a hole having substantially the same diameter as the sheath pipe using the driving rotation of the rotary blade portion of the excavator.

  In addition, the normal excavation by the excavator can be continued by releasing the mooring between the excavation ring for the sheath pipe and the rotary blade portion of the excavator and leaving the sheath pipe in the soil.

  Further, in the method for constructing a sheath pipe according to the present invention, the sheath pipe is installed such that the outer peripheral surface of the excavator is in close contact along the circumferential direction of the inner peripheral surface on the distal end side of the sheath pipe. In this case, the sheath pipe can be laid while preventing the excavation soil from flowing between the excavator and the sheath pipe body.

According to the excavation ring for a sheath pipe of the present invention, the sheath pipe can be laid with an existing excavator by being attached to the open end of the sheath pipe.
Further, according to the sheath pipe of the present invention, the sheath pipe can be laid by being attached to the existing excavator. Also, in the method for constructing the sheath pipe of the present invention, the sheath pipe is laid by the existing excavator. Can be performed.

It is the front schematic diagram (A) for demonstrating an example of the excavation ring for sheath pipes to which this invention is applied, and the cross-sectional schematic diagram (B) for demonstrating an example of the excavation ring for sheath pipes to which this invention is applied. Schematic diagram (A) for explaining another example of a digging ring for a sheath pipe to which the present invention is applied and a schematic diagram (B) for explaining another example of a digging ring for a sheath pipe to which the present invention is applied. It is. It is the front schematic diagram (A) for demonstrating an example of the sheath tube to which this invention is applied, and the cross-sectional schematic diagram (B) for demonstrating an example of the sheath tube to which this invention is applied. It is the front schematic diagram (A) for demonstrating the other example of the sheath pipe to which this invention is applied, and the cross-sectional schematic diagram (B) for demonstrating the other example of the sheath pipe to which this invention is applied. It is the front schematic diagram (A) for demonstrating an example of the use condition of the sheath pipe to which this invention is applied, and the cross-sectional schematic diagram (B) for demonstrating an example of the use condition of the sheath pipe to which this invention is applied. . Schematic front view (A) for explaining an example of the detached state of the sheath pipe and the excavator to which the present invention is applied, and an example of the detached state of the sheath pipe and the excavator to which the present invention is applied It is a cross-sectional schematic diagram (B). Front schematic diagram (A) for explaining another example of the usage state of the sheath tube to which the present invention is applied, and a schematic sectional view for explaining another example of the usage state of the sheath tube to which the present invention is applied ( B). Front schematic diagram (A) for demonstrating the other example of the removal state of the sheath pipe and excavation machine to which this invention is applied, and the other example of the removal state of the sheath pipe and the excavation machine to which this invention is applied It is a cross-sectional schematic diagram (B) for demonstrating. The schematic diagram (A) for demonstrating the attachment state of the excavator and a sheath pipe in the 1st process of an example of the construction method of the sheath pipe to which this invention is applied, and the construction method of the sheath pipe to which this invention is applied It is a schematic diagram (B) for demonstrating the excavation state of the excavator and a sheath pipe in the 1st process of an example. The schematic diagram (A) for demonstrating the removal state of the excavator and a sheath pipe in the 2nd process of an example of the construction method of the sheath pipe to which this invention is applied, and the construction method of the sheath pipe to which this invention is applied It is a schematic diagram (B) for demonstrating the other example of the removal state of the excavator in a 2nd process of an example. The schematic diagram (A) for demonstrating the installation state of the sheath pipe in the 3rd process of an example of the construction method of the sheath pipe to which this invention is applied, and the 3rd example of the construction method of the sheath pipe to which this invention is applied It is a schematic diagram (B) for demonstrating the laying state of a laying pipe | tube with the excavation machine in this process. It is a schematic diagram for demonstrating an example of the conventional excavation machine.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
FIG. 1A is a schematic front view for explaining an example of a casing tube excavation ring to which the present invention is applied, and FIG. 1B is a cross-sectional schematic diagram for explaining an example of a sheath pipe excavation ring to which the present invention is applied. FIG.

  The excavation ring 1 for a sheath pipe shown here has a first opening end 2 that is substantially the same diameter as a sheath pipe (not shown), and a second opening that is formed at a position facing the first opening end 2. It is comprised from the cylindrical ring main body 7 which is the product made from steel which has the opening end 3 of this.

  Here, four mooring portions 4 are arranged on the circumference of the second opening end 3 every 90 degrees from the central axis of the ring body 7.

  The mooring portion 4 is formed with a square-shaped rotating plate portion 5 projecting toward the central axis direction of the ring main body 7 at a substantially right angle with the ring main body 7 at the second opening end 3. A digging blade 6 for excavation is attached to the surface of the portion 5.

  The other end side of the support plate 26 having one end attached so as to be substantially parallel to the ring body 7 on the back surface of the mooring portion 4 on the traveling side of the rotating plate portion 5 and the inner peripheral surface of the ring body 7. In the middle, the rotating roller 8 is attached to be rotatable by the support shaft 9.

  Further, the tip of a rotary blade (not shown) of the excavator can be inserted into the surface of the support plate 26 in the direction of the central axis of the ring body 7 and the first opening end 2 side is formed open. A recess 10 is provided.

  Thereby, it is set as the structure by which the front-end | tip part of the rotary blade part (not shown) of an excavation machine is moored by the recessed part 10. FIG.

  An anchoring piece 13 is formed along the circumferential edge of the first opening end 2 of the ring body 7 so as to be bent at a substantially right angle toward the center axis of the ring body 7.

Next, an example of a usage state of the excavation ring 1 for a sheath pipe to which the present invention is applied will be described.
As shown in FIG. 5, a mooring groove portion 17 formed by bending a cross-sectionally concave shape toward the central axis side of the sheath tube main body 15 along the peripheral edge of the opening end 16 on the distal end side of the sheath tube main body 15. It is installed around.

  It is set as the structure connected with the mooring piece 13 of the excavation ring 1 for sheath pipes in this mooring groove part 17 in the inserted state.

  Further, a wellhead packing 18 is provided in an annular shape along the inner peripheral surface before the opening end 16 of the sheath tube main body 15.

  Further, the excavator 22 includes a cylindrical excavator main body 23 and a cross-shaped rotary blade portion 24 attached to the tip of the excavator main body 23 so as to be capable of driving and rotating. Further, a plurality of excavation blades 6A are attached to the surface of the rotary blade portion 24, respectively.

  The excavator 22 having such a configuration is inserted from the rear end side of the sheath pipe 14, and the rotary blade portion 24 of the excavator 22 is pushed into the sheath pipe excavation ring 1 of the sheath pipe 14.

  Here, the distal end portion 25 of the rotary blade portion 24 is inserted into the concave portion 10 provided in the anchoring portion 4 of the sheath tube excavation ring 1.

  As a result, the rotary blade portion 24 and the sheath tube excavation ring 1 are moored, so that the sheath tube excavation ring 1 can be rotated by the drive rotation of the rotary blade portion 24.

  In this case, the rotating tube 8 of the sheath tube excavation ring 1 rotates while being pressed against the side wall 21 of the mooring groove portion 17 of the sheath tube body 15, so that the sheath tube excavation ring 1 is smooth with respect to the sheath tube body 15. Can be rotated.

  Here, as shown in FIG. 6, when the mooring between the sheath tube excavation ring 1 and the rotary blade portion 24 of the excavator 22 is released, only the excavator 22 is moved backward by about 10 cm to The distal end portion 25 is detached from the concave portion 10 provided in the anchoring portion 4 of the sheath tube excavation ring 1.

  After releasing the mooring between the rotary blade portion 24 and the sheath tube excavation ring 1 in this way, a drive motor (not shown) mounted in the excavator main body 23 is turned by hand to turn the rotary blade portion 24 into the sheath. The pipe excavation ring 1 is rotated so as to be positioned between the mooring part 4 and the mooring part 4.

  Further, by moving only the excavator 22 by about 30 cm, the rotary blade portion 24 is moved forward of the sheath pipe excavation ring 1 without coming into contact with the sheath pipe excavation ring 1. Drilling is possible.

  In the present embodiment, the mooring portion has a recess in which the tip of the rotary blade portion can be inserted and the first opening end 2 side is formed in an open shape. There is no need to have a recess that is open on the end 2 side.

  For example, if the mooring with the casing tube excavation ring can be released by moving the rotary blade portion in the front-rear direction, the concave portion is open on the second opening end side, or the first opening end side and The second opening end side may be open.

  Further, in this embodiment, a rotating roller is provided that is attached to the first opening end and is capable of rotating around the opening end on the distal end side of the sheath tube. However, it is not always necessary to provide the rotating roller. There is no.

  However, it is desirable to provide a rotating roller in that the sheath tube excavation ring can rotate smoothly.

  In this invention which consists of the above structure, it becomes possible to excavate without using the cutter arm provided with the expansion-contraction function by attaching the excavation ring for sheath pipes to the existing sheath pipe.

  Also, when releasing the mooring between the sheath pipe excavation ring and the rotary blade of the excavator, it is possible to easily release the mooring by retreating the excavator and rotating the rotary blade to the required angle. Become.

<Another embodiment of the first embodiment>
FIG. 2A is a schematic front view for explaining another example of a drill tube for a sheath pipe to which the present invention is applied, and FIG. 2B is a diagram for explaining another example of the drill ring for a sheath pipe to which the present invention is applied. It is a cross-sectional schematic diagram for this.

  A digging ring for sheath pipe 1A shown here has a first opening end 2 that is substantially the same diameter as a sheath pipe (not shown), and a second opening formed at a position facing the first opening end 2. It is comprised from the cylindrical ring main body 7 which is the product made from steel which has the opening end 3 of this.

  Here, four mooring portions 4 </ b> A are arranged every 90 degrees from the central axis of the ring body 7 on the circumferential edge of the second opening end 3.

  The mooring portion 4A is formed with a square-shaped rotating plate portion 5 projecting toward the central axis direction of the ring body 7 at a substantially right angle with the ring body 7 at the second opening end 3, and further, the rotating plate A digging blade 6 for excavation is attached to the surface of the portion 5.

  The other end side of the support plate 26 having one end attached so as to be substantially parallel to the ring body 7 and the inner peripheral surface of the ring body 7 on the back surface on the traveling side of the rotating plate part 5 of the mooring part 4A. In the middle, the rotating roller 8 is attached to be rotatable by the support shaft 9.

  Moreover, the notch opening part 12 which can pass the front-end | tip of the rotary blade part (not shown) of an excavator is formed in the center axis line side end of the ring main body 7 of the rotary plate part 5 of the mooring part 4A. A tip of a rotary blade (not shown) of the excavator can be inserted into the surface of the support plate 26 in the direction of the central axis of the ring body 7 so as to communicate with the notch opening 12 and the first There is provided a recess 10 in which the open end 2 side is formed open.

  A mooring piece 13 is formed along the circumferential edge of the first opening end 2 of the ring body 7 so as to be bent at a substantially right angle toward the central axis side of the ring body 7.

Next, an example of a usage state of the casing tube excavation ring 1A to which the present invention is applied will be described.
As shown in FIG. 7, a mooring groove portion 17 formed by bending a cross-sectionally concave shape toward the central axis side of the sheath tube main body 15 along the circumferential edge of the opening end 16 on the distal end side of the sheath tube main body 15 is formed. It is installed around.

  It is set as the structure connected with the mooring piece 13 of the excavation ring 1A for sheath pipes in this mooring groove part 17A.

  Further, a wellhead packing 18 is provided in an annular shape along the inner peripheral surface before the opening end 16 of the sheath tube main body 15.

  Further, the excavator 22 includes a cylindrical excavator main body 23 and a cross-shaped rotary blade portion 24 attached to the tip of the excavator main body 23 so as to be capable of driving and rotating. Further, a plurality of excavation blades 6A are attached to the surface of the rotary blade portion 24, respectively.

  The excavator 22 having such a configuration is inserted into an opening end (not shown) on the rear end side of the sheath pipe 14A, and the rotary blade portion 24 of the excavator 22 is connected to the sheath pipe excavation ring 1A. Push in.

  Here, the distal end portion 25 of the rotary blade portion 24 is inserted into the concave portion 10 provided in the mooring portion 4 of the sheath tube excavation ring 1A.

  As a result, the rotary blade portion 24 and the sheath tube excavation ring 1 are moored so that the sheath tube excavation ring 1 </ b> A can be rotated by the drive rotation of the rotary blade portion 24.

  In this case, the rotating tube 8 of the sheath tube excavation ring 1 rotates while being pressed against the side wall 21 of the mooring groove portion 17 of the sheath tube body 15, so that the sheath tube excavation ring 1 </ b> A is smooth with respect to the sheath tube body 15. Can be rotated.

  8A is a schematic front view for explaining another example of the detached state of the sheath pipe and the excavator to which the present invention is applied, and FIG. 8B is a sheath pipe and the excavation to which the present invention is applied. It is a cross-sectional schematic diagram for demonstrating the other example of a removal state with a machine.

  Here, as shown in FIG. 8, when the mooring between the sheath tube excavation ring 1 </ b> A and the rotary blade portion 24 of the excavator 22 is released, only the excavator 22 is moved forward by about 10 cm. Thereby, the front-end | tip part 25 of the rotary blade part 24 moves ahead of the excavation ring 1A for sheathed pipes from the inside of the recessed part 10 of the mooring part 4A through the notch opening part 12 of the rotary plate part 5. FIG.

  By releasing the mooring between the rotary blade portion 24 and the sheath tube excavation ring 1A in this manner, excavation by the excavator 22 by driving rotation of the rotary blade portion 24 using the sheath tube 14A as a wellhead becomes possible.

  In the present embodiment, a rotating roller is provided that is attached to the first opening end and is capable of rotating around the opening end on the distal end side of the sheath tube. However, it is not always necessary to provide the rotating roller. There is no.

  However, it is desirable to provide a rotating roller in that the sheath tube excavation ring can rotate smoothly.

  In this invention which consists of the above structure, it becomes possible to excavate without using the cutter arm provided with the expansion-contraction function by attaching the excavation ring for sheath pipes to the existing sheath pipe.

  Further, when the mooring between the sheath pipe excavation ring and the rotary blade of the excavator is released, the mooring can be easily released by moving only the excavator forward.

<Second Embodiment>
FIG. 3A is a schematic front view for explaining an example of a sheath tube to which the present invention is applied, and FIG. 3B is a schematic sectional view for explaining an example of a sheath tube to which the present invention is applied.

  The sheath tube 14 shown here has a total length of approximately 2 m and an outer diameter of a steel tube main body 15 made of steel pipe having a size that is about 20 to 50 cm larger than the outer diameter of an excavator (not shown), and the sheath tube main body 15. It is comprised from the excavation ring 1 for sheath pipes connected with the front end side of this in the state which can rotate freely.

  Here, along the circumferential edge of the opening end 16 on the distal end side of the sheath tube main body 15, a mooring groove portion 17 that is bent and formed into a concave cross section toward the central axis side of the sheath tube main body 15 is provided. Yes.

  The mooring groove portion 17 is connected to the mooring groove portion 17 in a state where the mooring piece 13 of the sheath pipe excavation ring 1 described in detail in <First embodiment> is inserted.

  Further, a wellhead packing 18 is provided in an annular shape along the inner peripheral surface before the opening end 16 of the sheath tube main body 15.

  The wellhead packing 18 has an outer diameter that is the same as the inner diameter of the sheath tube main body 15, and the outer peripheral edge of the annular rubber packing 19 that is smaller by about 20% than the outer diameter of the excavator (not shown). It is fixed by a clamping plate 20 that is provided around the inner peripheral surface of the sheath tube main body 15.

  By passing an excavator (not shown) through such a rubber packing 19, the rubber pipe 19 is bent from the middle toward the distal end side of the sheath tube main body 15 to prevent the outflow of earth and sand and groundwater into the shaft. It is said that.

  Further, as will be described in detail in the <First Embodiment>, the sheath tube excavation ring 1 includes a first open end 2 having a diameter substantially the same as that of the sheath tube (not shown), It is comprised from the cylindrical ring main body 7 made from steel which has the 2nd opening end 3 formed in the position facing the opening end 2 of 1.

  Here, four mooring portions 4 are arranged on the circumferential edge of the second opening end 3 every 90 degrees from the central axis of the ring body 7.

  The mooring portion 4 is formed with a square-shaped rotating plate portion 5 projecting toward the central axis direction of the ring main body 7 at a substantially right angle with the ring main body 7 at the second opening end 3. A digging blade 6 for excavation is attached to the surface of the portion 5.

  The other end side of the support plate 26 having one end attached so as to be substantially parallel to the ring body 7 on the back surface of the mooring portion 4 on the traveling side of the rotating plate portion 5 and the inner peripheral surface of the ring body 7. In the middle, the rotating roller 8 is attached to be rotatable by the support shaft 9.

  The rotating roller 8 is configured such that the sheath tube excavation ring 1 can smoothly rotate by rotating while pressing the side wall 21 of the mooring groove portion 17 of the sheath tube main body 15.

  In addition, the tip of the rotary blade (not shown) of the excavator can be inserted into the surface of the support plate 26 in the direction of the central axis of the ring body 7, and the first opening end 2 side is formed open. A recessed portion 10 is provided.

  Thereby, it is set as the structure by which the front-end | tip part of the rotary blade part (not shown) of an excavation machine is moored by the recessed part 10. FIG.

Next, an example of the usage state of the sheath tube 14 to which the present invention is applied will be described.
As shown in FIG. 5, the excavator 22 includes a cylindrical excavator main body 23 and a cross-shaped rotary blade portion 24 attached to the tip of the excavator main body 23 so as to be capable of driving and rotating. Further, a plurality of excavation blades 6A are attached to the surface of the rotary blade portion 24, respectively.

  The excavator 22 having such a configuration is inserted from the rear end side of the sheath pipe 14, and the rotary blade portion 24 of the excavator 22 is pushed into the sheath pipe excavation ring 1 of the sheath pipe 14.

  Here, the distal end portion 25 of the rotary blade portion 24 is inserted into the concave portion 10 provided in the anchoring portion 4 of the sheath tube excavation ring 1.

  As a result, the rotary blade portion 24 and the sheath tube excavation ring 1 are moored, so that the sheath tube excavation ring 1 can be rotated by the drive rotation of the rotary blade portion 24.

  In this case, the rotating tube 8 of the sheath tube excavation ring 1 rotates while being pressed against the side wall 21 of the mooring groove portion 17 of the sheath tube body 15, so that the sheath tube excavation ring 1 is smooth with respect to the sheath tube body 15. Can be rotated.

  Here, as shown in FIG. 6, when the mooring between the sheath tube excavation ring 1 and the rotary blade portion 24 of the excavator 22 is released, only the excavator 22 is moved backward by about 10 cm to The distal end portion 25 is detached from the concave portion 10 provided in the anchoring portion 4 of the sheath tube excavation ring 1.

  After releasing the mooring between the rotary blade portion 24 and the sheath tube excavation ring 1 in this way, a drive motor (not shown) mounted in the excavator main body 23 is turned by hand to turn the rotary blade portion 24 into the sheath. The pipe excavation ring 1 is rotated so as to be positioned between the mooring part 4 and the mooring part 4.

  Further, by moving only the excavator 22 by about 30 cm, the rotary blade portion 24 is moved forward of the sheath pipe excavation ring 1 without coming into contact with the sheath pipe excavation ring 1. Drilling is possible.

  In this invention which consists of the above structure, it becomes possible to excavate without using the cutter arm provided with the expansion-contraction function by attaching the excavation ring for sheath pipes to the existing sheath pipe.

  Moreover, when releasing the mooring between the excavation ring for the sheath pipe and the rotary blade portion of the excavator, the sheath pipe can be easily released by moving the excavator backward and rotating the rotary blade portion to the required angle. Can be installed.

  Moreover, it becomes possible to apply also to the sheath pipe from which an outer diameter differs by attaching the protrusion part which can be inserted in the recessed part of the excavation ring for sheath pipes to the front-end | tip of the rotary blade part of the existing excavator.

<Another embodiment of the second embodiment>
4A is a schematic front view for explaining another example of a sheath tube to which the present invention is applied, and FIG. 4B is a schematic sectional view for explaining another example of the sheath tube to which the present invention is applied. FIG.

  The sheath tube 14A shown here is connected to the sheath tube body 15 made of steel pipe and the distal end side of the sheath tube body 15 in a freely rotatable state, as described in detail in <Second embodiment>. It is comprised from the drilling ring 1A for sheath pipes.

  Here, along the circumferential edge of the opening end 16 on the distal end side of the sheath tube main body 15, a mooring groove portion 17 that is bent and formed into a concave cross section toward the central axis side of the sheath tube main body 15 is provided. Yes.

  The mooring groove portion 17 is connected to the mooring groove portion 17 in a state in which the mooring piece 13 of the sheath pipe excavation ring 1A described in detail in <Other embodiment of the first embodiment> is inserted.

  Furthermore, a wellhead packing 18 is provided in an annular shape along the inner peripheral surface of the sheath tube main body 15 in front of the opening end 16 on the distal end side.

  The wellhead packing 18 has an outer diameter that is the same as the inner diameter of the sheath tube main body 15A, and an outer peripheral edge of an annular rubber packing 19 that has an inner diameter that is about 20% smaller than the outer diameter of an excavator (not shown). It is fixed by a clamping plate 20 that is provided around the inner peripheral surface of the sheath tube main body 15.

  The sheath tube excavation ring 1 </ b> A includes a first opening end 2 that is substantially the same diameter as the sheath tube (not shown), and a second opening formed at a position facing the first opening end 2. It is comprised from the cylindrical ring main body 7 which is made of steel having the open end 3.

  Here, four mooring portions 4 </ b> A are arranged every 90 degrees from the central axis of the ring body 7 on the circumferential edge of the second opening end 3.

  The mooring portion 4A is formed with a square-shaped rotating plate portion 5 projecting toward the central axis direction of the ring body 7 at a substantially right angle with the ring body 7 at the second opening end 3, and further, the rotating plate A digging blade 6 for excavation is attached to the surface of the portion 5.

  The other end side of the support plate 26 having one end attached so as to be substantially parallel to the ring body 7 and the inner peripheral surface of the ring body 7 on the back surface on the traveling side of the rotating plate part 5 of the mooring part 4A. In the middle, the rotating roller 8 is attached to be rotatable by the support shaft 9.

  The rotating roller 8 is configured such that the sheath tube excavation ring 1 </ b> A can rotate smoothly by rotating while pressing the side wall 21 of the mooring groove portion 17 of the sheath tube main body 15.

  Moreover, the notch opening part 12 which can pass the front-end | tip of the rotary blade part (not shown) of an excavation machine is formed in the center axis line side end of the ring main body 7 of the rotary plate part 5 of the mooring part 4A. A tip of a rotary blade (not shown) of the excavator can be inserted into the surface of the support plate 26 in the direction of the central axis of the ring body 7 so as to communicate with the notch opening 12 and the first There is provided a recess 10 in which the open end 2 side is formed open.

Next, an example of the usage state of the sheath tube 14A to which the present invention is applied will be described.
As shown in FIG. 7, the excavator 22 includes a cylindrical excavator main body 23 and a cross-shaped rotary blade portion 24 attached to the tip of the excavator main body 23 so as to be capable of driving and rotating. Further, a plurality of excavation blades 6A are attached to the surface of the rotary blade portion 24, respectively.

  The excavator 22 having such a configuration is inserted into an open end (not shown) on the rear end side of the sheath pipe 14A, and the rotary blade 24 of the excavator 22 is connected to the sheath pipe excavation ring 1A of the sheath pipe 14A. Push in.

  Here, the distal end portion 25 of the rotary blade portion 24 is inserted into the concave portion 10 provided in the mooring portion 4A of the sheath tube excavation ring 1A.

  Thereby, the rotary blade portion 24 and the sheath tube excavation ring 1 </ b> A are moored so that the sheath tube excavation ring 1 </ b> A can be rotated by the drive rotation of the rotary blade portion 24.

  In this case, the rotating tube 8 of the sheath tube excavation ring 1 </ b> A rotates while being pressed against the side wall 21 of the mooring groove portion 17 of the sheath tube body 15, so that the sheath tube excavation ring 1 </ b> A is smooth with respect to the sheath tube body 15. Can be rotated.

  Here, as shown in FIG. 8, when the mooring between the sheath tube excavation ring 1 </ b> A and the rotary blade portion 24 of the excavator 22 is released, only the excavator 22 is moved forward by about 10 cm so that the rotary blade portion 24 is moved forward. The distal end portion 25 moves from the inside of the concave portion 10 of the mooring portion 4A to the front of the sheath tube excavation ring 1A through the notch opening portion 12 of the rotating plate portion 5.

  By releasing the mooring between the rotary blade portion 24 and the sheath tube excavation ring 1A in this manner, excavation by the excavator 22 by driving rotation of the rotary blade portion 24 using the sheath tube 14A as a wellhead becomes possible.

  In this invention which consists of the above structure, it becomes possible to excavate without using the cutter arm provided with the expansion-contraction function by attaching the excavation ring for sheath pipes to the existing sheath pipe.

  Moreover, when releasing the mooring between the excavation ring for the sheath pipe and the rotary blade portion of the excavator, the sheath pipe can be installed by easily releasing the mooring by moving only the excavator.

  Moreover, it becomes possible to apply also to the sheath pipe from which an outer diameter differs by attaching the protrusion part which can be inserted in the recessed part of the excavation ring for sheath pipes to the front-end | tip of the rotary blade part of the existing excavator.

<Third Embodiment>
Next, an example of the construction method of a sheath pipe using the excavation ring for sheath pipes to which this invention is applied is explained in full detail below.
FIG. 9 (A) is a schematic diagram for explaining the attachment state of the excavator and the sheath pipe in the first step of an example of the construction method of the sheath pipe to which the present invention is applied, and FIG. 9 (B) shows the present invention. It is a schematic diagram for demonstrating the excavation state of the excavation machine and a sheath pipe in the 1st process of an example of the construction method of the applied sheath pipe.

[First step]
First, as shown in FIG. 9 (A), the earth retaining wall B of the shaft A is mirror-cut, and then the wellhead packing C is attached.

  Next, the sheath pipe 14 having the sheath pipe excavation ring 1 attached to the opening end on the distal end side of the sheath pipe main body 15 is attached to the outer peripheral surface of the excavator 22 while maintaining a predetermined distance. In this case, the wellhead packing 18 is attached along the inner peripheral surface on the distal end side of the sheath pipe main body 15, and the rotary blade 24 of the excavator 22 and the sheathing pipe excavation ring 1 in a state where the excavator 22 is inserted into the wellhead packing 18. The mooring part (not shown) is moored. Furthermore, it fixes with the fastening volt | bolt (not shown) via the spacer D between the excavation machine 22 and the sheath pipe main body 15. FIG.

  In this way, the excavator 22 to which the sheath pipe 14 is attached performs the excavation to the length of the sheath pipe 14 by extending the main push jack E while driving and rotating the rotary blade portion 24 and the sheath pipe excavation ring 1.

Subsequently, as shown in FIG. 9 (B), after excavating to the length of the sheath pipe 14, the rotary pusher 24 is connected to the shaft A side by the main push jack E, and the rotary blade portion 24 is the excavation ring for the sheath pipe. Pull back 20-30 cm to ensure space to move to the front. At this time, in order to prevent the excavation hole from collapsing, mud fluid soil or high-concentration mud water improved from the excavation soil is pumped to the rotary blade 24 by a pump (not shown). In this case, construction is performed while maintaining the pressure of the rotary blade 24 at a pressure obtained by adding ²⁰ to 50 kN / m ² to the groundwater pressure while balancing the pullback speed and the pumping amount of the sheath pipe 14 and the excavator 22. Do.

  Next, FIG. 10 (A) is a schematic diagram for explaining the removed state of the excavator and the sheath pipe in the second step of an example of the construction method of the sheath pipe to which the present invention is applied, and FIG. It is a schematic diagram for demonstrating the other example of the removal state of the excavation machine in the 2nd process of an example of the construction method of the sheath pipe to which this invention is applied.

[Second step]
As shown in FIG. 10A, the base end side of the sheath tube 14 is fixed to the earth retaining wall B by welding or the like. Moreover, the sheath pipe 14 drawn back into the shaft A is removed by fusing or the like.
Subsequently, the fastening with the spacer D fastened and fixed between the excavator 22 and the sheath tube main body 15 is released.

Here, as described in detail with reference to FIG. 6, the pulling mooring is canceled by about 10 cm only with the main pushing jack E for the excavator 22. At this time, in order to prevent the excavation hole from collapsing, mud fluid soil or high-concentration mud water improved from the excavation soil is pumped to the rotary blade 24 by a pump (not shown). In this case, construction is performed while maintaining the pressure of the rotary blade 24 at a pressure obtained by adding ²⁰ to 50 kN / m ² to the groundwater pressure while balancing the pullback speed and the pumping amount of the sheath pipe 14 and the excavator 22. Do. Then, a drive motor (not shown) mounted in the excavator 22 is turned by hand, and the rotary blade portion 24 is rotated so as to be positioned between the mooring portion 4 and the mooring portion 4 of the sheath tube excavation ring 1. The rotary pusher 24 is moved forward by the main push jack E by about 30 cm to the front of the sheath tube excavation ring 1. At this time, the mud fluid soil and high-concentration mud filled in the excavation hole are constructed while draining from the excavator's drain port (not shown) so as not to erupt on the ground. It is necessary to maintain the pressure of the borehole by adding ²⁰ to 50 kN / m ² to the groundwater pressure.

Further, as shown in FIG. 10B, the base end side of the sheath tube 14A is fixed to the earth retaining wall B by welding or the like. Further, the sheath pipe 14A drawn back into the shaft A is removed by fusing or the like.
Subsequently, the fastening with the spacer D fastened and fixed between the excavator 22 and the sheath tube main body 15 is released.

Here, as described in detail in FIG. 8, by moving only the excavator 22 forward, the mooring between the rotary blade portion 24 and the sheath tube excavation ring 1 </ b> A is released, and the rotary blade portion 24 is located in front of the sheath tube excavation ring 1 </ b> A. Move to. At this time, the mud fluid soil and high-concentration mud filled in the excavation hole are constructed while draining from the excavator's drain port (not shown) so as not to erupt on the ground. It is necessary to maintain the pressure of the borehole by adding ²⁰ to 50 kN / m ² to the groundwater pressure.

  Next, FIG. 11 (A) is a schematic diagram for explaining the installation state of the sheath pipe in the third step of an example of the construction method of the sheath pipe to which the present invention is applied, and FIG. 11 (B) is an application of the present invention. It is a schematic diagram for demonstrating the laying state of a laying pipe by the excavation machine in the 3rd process of an example of the construction method of a sheath pipe.

[Third step]
As shown in FIG. 11 (A), the sheath tube 14 composed of the sheath tube excavation ring 1 and the sheath tube main body 15 is left in the soil, so that the sheath tube 14 is laid in the soil.

  Here, the main pushing jack E is extended while driving and rotating the rotary blade portion 24 of the excavator 22, and normal propulsion by the excavator 22 is performed.

  Subsequently, as shown in FIG. 11 (B), when the main push jack E extends to a length that allows the next laying pipe F to be installed, the main push jack E is contracted and lowered to the bottom of the shaft A. Then, after the laying pipe F is pushed into the sheath pipe 14 from the shaft A and the main jack E is raised to a predetermined position, normal propulsion by the main jack E and the excavator 22 is performed.

  In the present embodiment, it has a wellhead packing attached so that the outer peripheral surface of the excavator is in close contact along the circumferential direction of the inner peripheral surface on the distal end side of the sheath tube. There is no need to have a packing.

  However, it is desirable to provide wellhead packing in terms of preventing inflow of debris from between the sheath pipe and the excavator.

  In the construction method of the sheath pipe of the present invention having the above configuration, the sheath pipe is propelled by utilizing the rotational force of the rotary blade portion of the existing excavator by attaching a drill pipe for the sheath pipe to the opening end of the sheath pipe. Is possible.

  Moreover, since it becomes possible to continue construction of the laying pipe by the excavating machine in a state in which the excavation ring for the sheath pipe and the sheath pipe are left, the working efficiency becomes very good.

DESCRIPTION OF SYMBOLS 1, 1A Sheath pipe excavation ring 2 1st opening end 3 2nd opening end 4, 4A Mooring part 5 Rotating plate part 6, 6A Excavation blade 7 Ring main body 8 Rotating roller 9 Support shaft 10 Recess 12 Notch opening 13 Mooring Pieces 14 and 14A Sheath tube 15 Sheath tube body 16 Open end 17 Mooring groove portion 18 Wellhead packing 19 Rubber packing 20 Nipping plate 21 Side wall 22 Digging machine 23 Digging machine main body 24 Rotary blade portion 25 Tip portion 26 Support plate

Claims (3)

A sheath tube body having a first connecting portion at one end;
The outer diameter of the excavator is clamped by a clamping plate provided along the inner peripheral surface of the sheath tube main body, the outer diameter is substantially the same as the inner diameter of the sheath tube main body, and the inner diameter is accommodated in the sheath tube main body. Wellhead packing smaller than the diameter,
Is the outer diameter substantially the same diameter of the open end of the sleeve pipe body, and with mounted rotatably in the circumferential direction of the open end, the first having a second connecting portion that connects to the first coupling part 1 open end, and a position facing the first open end, a second open end anchor portion which is capable anchored to the rotary blade unit of the excavation proceeds machine along a circumferential edge is located sheath pipe comprising a drilling ring sheath tube, the having. Providing a hole in the shaft retaining wall;
A sheath pipe having a drilling ring for a sheath pipe provided with a drilling blade which is held at a predetermined distance from the outer peripheral surface of the excavator and is rotated by being moored to the rotary blade part of the excavator is inserted into the hole. Drilling the inside,
Releasing the mooring between the sheath pipe excavation ring and the rotary blade of the excavator and leaving the sheath pipe in the soil.
How to install a sheath tube. The sheath pipe has a wellhead packing attached so that the outer peripheral surface of the excavator is in close contact along the circumferential direction of the inner peripheral surface on the distal end side of the sheath pipe.
The construction method of the sheath pipe of Claim 2.

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