JP5705031B2 - Buried pipe reconstruction method - Google Patents

Description

  The present invention relates to a buried pipe reconstructing method for reconstructing an existing buried pipe that has been buried and aged into a new buried pipe, and more particularly to a method for reconstructing a concrete buried pipe having a steel joint at a connecting portion.

  JP-A-2006-291565 discloses a new pipe by crushing an existing buried pipe made of concrete and reinforcing bar using a cutter head that exposes the reinforcing bar while crushing a concrete portion, and chops the exposed reinforcing bar with a cutter. The buried pipe reconstruction method to be installed sequentially is disclosed.

  Japanese Patent Laid-Open No. 2002-349756 discloses that a start pit is excavated at the start position of an existing buried pipe that needs to be updated, a reaching pit is excavated at the end position, and the pipe of the existing buried pipe is installed in the propulsion device installed in the start pit. Protrusions contacting the outer circumference of the end, and when propelled beyond the unit length of the existing buried pipe, the existing buried pipe is not crushed per unit length via a mechanism that grips the inside of the existing buried pipe and transports the existing buried pipe. A method for renewing an existing buried pipe is disclosed in which the old and new buried pipes are replaced by collecting the buried pipe through the inside of the updated pipe into the starting pit and by connecting the buried pipe to the end of the propulsion device.

JP 2006-291565 A JP 2002-349756 A

  However, in the buried pipe reconstruction method disclosed in Japanese Patent Laid-Open No. 2006-291565, the rebar can be cut, but in the reconstruction of an existing concrete pipe having a steel joint having a thickness of 4 to 6 mm, There is a problem that the ring cannot be cut.

  Further, in the buried pipe renovation method disclosed in Japanese Patent Application Laid-Open No. 2002-349756, the existing concrete pipe is cut through the inside of the renewal pipe without being crushed for each unit length, so that the existing concrete pipe is cut. Since the unit length to be determined depends on the diameter of the starting shaft, there is a problem that the existing concrete pipe cannot be efficiently recovered.

  The present invention solves the above-described conventional problems, stabilizes existing concrete pipes and grounds to be reconstructed, and enables the rebuilding of existing concrete pipes equipped with steel joints efficiently. The purpose is to provide.

In order to solve the above problems, the buried pipe reconstruction method of the present invention includes a step of excavating a start shaft and a reaching shaft at the start end position and the end position of an existing concrete pipe buried underground, and a cutter head on the start shaft The step of arranging the excavator, the steel joint removal step of removing the steel joints of the existing concrete pipe in order from the start shaft side, and the gap part from which the steel joints have been removed are protected by natural ground protective materials. a steel Tsugiwa remove traces gap protection step, the shield machine is starting, the steel Tsugiwa is removed sequentially crush the existing concrete pipe mound protective material is filled, and the existing concrete pipe crushing step of removing, the existing And a new pipe propulsion embedding process for propelling and embedding new pipes in accordance with the progress of the concrete pipe crushing and removing process.

  Further, the buried pipe reconstruction method of the present invention is a steel joint removal process, in which the rotating blade direction is variable and a barrel cutter device that can move in the axial direction and the circumferential direction is used. The steel joint ring is cut and removed by cutting in the direction.

  Moreover, the buried pipe reconstruction method of the present invention is characterized in that, in the steel joint removal process, an operator enters the existing concrete pipe and cuts and uses a crushing tool.

  Further, the buried pipe reconstruction method of the present invention is characterized in that the steel joint removal process, the steel joint removal trace void protection process, the existing concrete pipe crushing removal process, and the new pipe propulsion embedding process are performed under pressure. To do.

  The buried pipe reconstruction method of the present invention is characterized in that a movable earth pressure adjusting plate is installed in the existing concrete pipe in front of the excavation face of the excavator in the existing concrete pipe crushing and removing step.

Excavating start and end shafts at the start and end positions of existing concrete pipes buried underground, placing excavators equipped with cutter heads at the start shafts, and steel links for existing concrete pipes a steel Tsugiwa removal step of sequentially removing from the starting pit side, and steel Tsugiwa remove traces gap protection step of protecting the gap portion obtained by removing the steel Tsugiwa by natural ground protection member, thereby starting the excavator, The existing concrete pipe crushing and removing process that sequentially crushes and removes the existing concrete pipe that has been removed from the steel joints and filled with ground protection material, and the new pipe that is propelled and buried according to the progress of the existing concrete pipe crushing and removing process A pipe propulsion embedding process, removing steel joints in advance, and protecting the ground with a ground protection material, and removing the traces including the part of the joints in the excavator with a normal cutter head The The set concrete pipes it is possible to crush removed.
In the steel joint removal process, the rotating blade direction is variable and the cutter cutter is movable in the axial and circumferential directions, and the steel joint is removed by cutting in the circumferential and axial directions of the steel joint. This makes it possible to efficiently cut and remove the steel joint.
In the steel joint removal process, when the worker enters the existing concrete pipe and cuts and performs using a crushing tool, the steel joint removal can be performed flexibly according to the situation.
By implementing the steel joint removal process, the steel joint removal trace clearance protection process, the existing concrete pipe crushing removal process, and the new pipe propulsion embedding process under pressure, water leakage from natural ground is prevented and a dry environment It becomes possible to carry out buried pipe reconstruction work.
By installing a movable earth pressure adjusting plate in the existing concrete pipe in front of the excavation face by the excavator in the existing concrete pipe crushing and removal process, fluctuations in the face pressure generated when excavating the existing concrete pipe is removed are reduced. Thus, stable construction becomes possible.

It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention. It is a figure which shows embodiment of this invention.

  The buried pipe reconstruction method of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing an embodiment of the buried pipe reconstruction method of the present invention.

  The existing concrete pipe 3 is made of reinforced concrete, and a steel joint 5 having a thickness of 4 to 6 mm is installed at the connecting portion. The starting shaft 1 and the reaching shaft 2 are excavated at the starting position and the reaching position of the existing concrete pipe 3 to be reconstructed.

  The excavator 6 is installed in the start shaft 1. In the excavator 6, a face plate 9 that is rotationally driven by a drive motor 8 is installed on the front surface of the excavator main body 7, and a plurality of roller bits 10 are rotatably arranged on the face plate. Details of the excavator 6 will be described later. In the start shaft 1, a main push jack 16 for laying the new pipe 4 is installed as the existing concrete pipe crushing and removing process of the excavator 6 progresses.

  In the renovation work, if the ground is exposed for a period of time in the steel joint removal process and there is a risk of infiltration of groundwater, a pneumatic lock 13 is installed in the reaching shaft 2. In that case, the pressure cylinder 11 having an air lock door is installed at the rear part of the excavator 6, and the inside of the existing concrete pipe 3 which is renovated by supplying pressurized air from the supply equipment 14 installed on the ground through the supply pipe 15 is brought into a pressurized state. To do. In renovation work without problems of ingress of groundwater, it is not necessary to be in a pressurized state.

  Prior to the crushing and removing process of the existing concrete pipe by the excavating machine 6, the removing process of the steel joint 5 that is difficult to cut and remove by the excavating machine 6 installed at the connecting portion of the existing concrete pipe 3 is sequentially performed. In the steel joint removal step, an operator may enter the existing concrete pipe 3 and cut and remove it using various tools. The removed steel joint 5 may be transported to the start shaft 1 side through the excavator 6, but is desirably transported from the reach shaft 2 side with few facilities.

  FIGS. 2, 3 and 4 show an embodiment in which the body cut cutter device 17 is used to perform the steel joint removal process more efficiently. The body cutting cutter device 17 includes a pair of support members 18 disposed at a predetermined interval in the front and rear in the axial direction. As shown in FIG. 4, the column member 18 includes left and right vertical portions 19 that can be expanded and contracted by hydraulic pressure and the like, and a horizontal portion 20 that connects the left and right vertical portions 19. At the upper and lower ends of the left and right vertical portions, grounding portions 21 are provided for fixing the column members 18 that are pressed against the inner wall of the existing concrete pipe 3. At the lower ends of the left and right vertical portions, a movable wheel (not shown) that can be moved in and out may be provided in order to make the body cutting cutter device 17 movable in the existing concrete pipe 3.

  The horizontal portions 20 of the front and rear support members 18 are connected by a horizontal connecting member 22 that can extend and contract in the axial direction. A cutter holding member 23 is installed on the horizontal connecting member 22 so as to be rotatable in the circumferential direction by a circumferential driving means 24. A cutter 25 is installed on the cutter holding member 23 so as to be stretchable in the circumferential direction. The cutter holding member 23 is rotatable to change the direction of the cutter. The cutter holding member 23 is provided with a cutter driving means for driving the cutter 25 to rotate.

  In the removing process of the steel joint 5 by the body cutter cutter 17, first, the column member 18 is moved so that the cutter 25 comes to the position of the steel joint 5. Next, the vertical part 19 of the column member 18 is extended, and the upper and lower grounding parts 21 are pressed against the inner wall of the existing concrete pipe 3 to fix the drum cutter 17. Next, the cutter holding member 23 is rotated so that the orientation of the cutter becomes the position shown in FIG. The cutter 25 is rotationally driven while being pressed in the circumferential direction, and is moved in the circumferential direction by the circumferential driving means 24, and both end portions in the axial direction of the steel joint ring 5 are cut together with the existing concrete pipe 3.

  When the cutting of both ends of the steel joint ring 5 is completed, the cutter holding member 23 is rotated so that the orientation of the cutter is in the position shown in FIG. The cutter 25 is rotated while being pressed in the circumferential direction, and the telescopic means of the horizontal connecting member 22 is driven to move the cutter 25 in the axial direction, thereby cutting the steel joint ring 5 in the axial direction. The cutting in the axial direction of the steel joint 5 is set so that the steel joint 5 having both ends cut is easily removed. When one steel joint removal process is completed, the body cutter device 17 is moved to the next steel joint 5 removal position.

  When the steel joint removal step by the body cutting cutter device 17 is completed, a step of filling and solidifying the ground protection material 30 in the empty space from which the steel joint 5 has been removed is performed. The steel joint removal trace clearance protecting process will be described with reference to FIG.

A mold 27 is installed via a mold support member 28 on the inner wall of the existing concrete pipe 3 in the empty space from which the steel joint 5 has been removed. A natural ground protective material 30 is supplied from a natural ground protective material supply pipe 29 to the gap from which the steel joint 5 provided with the mold 27 is removed, and is filled and solidified. As the natural ground protection material 30, a fast-curing cement milk or the like is used. After the filled ground protection material 30 is solidified, the mold 27 is removed.
Instead of using cement milk or the like as a natural mountain protective material, it is also possible to use a pre-prepared mountain piece or the like in the steel joint removal mark void protecting step.

  The steel joint removal process and the steel joint removal trace clearance protection process are performed prior to the crushing of the existing concrete pipe 3 by the excavator 6 in the subsequent existing concrete pipe crushing and removing process. Considering the solidification time of the ground protection material 30, the steel joint removal process and the steel joint removal trace clearance protection process are connected from the excavation face of the excavator 6 to the front of two or three existing concrete pipes 3. It is desirable to carry out in advance in the department. Prior to the existing concrete pipe crushing and removing process by the excavator 6, a steel joint removal process and a steel joint removal trace clearance protecting process are performed on all steel joints 5 of the existing concrete pipe 3 to be renovated. You may do it.

  Next, an embodiment of the excavator 6 used in the existing concrete pipe crushing and removing step will be described with reference to FIGS.

  The excavator 6 includes a ring-shaped face plate 9 having a central opening 31 at the front end of a cylindrical excavator main body 7. On the outer periphery of the excavator main body 7, a mountain retaining cylindrical member 32 whose front end extends before the front end of the excavator main body is installed. A slit cutter 33 is installed at the tip of the Yamadome cylindrical portion 32. A plurality of roller bits 10 are rotatably arranged on the ring-shaped face plate 9 to constitute a cutter head. The ring-shaped face plate 9 is rotationally driven by a drive motor 8 installed in the excavator main body 7. The roller bit 10 rotates with the rotation of the ring-shaped face plate 9 while being pressed by the existing concrete pipe 3 and the natural ground, and excavates the existing concrete pipe, natural ground and natural ground protective material 30. Since the steel joint ring 5 is removed and the ground protection material 30 is filled and solidified in the gap, it is possible to stabilize the digging face and efficiently carry out the existing concrete pipe crushing and removing step.

  In the crushing and removing process of the existing concrete pipe by the excavator 6, the earth pressure adjusting plate 35 is movably installed in the existing concrete pipe 3 in front of the excavation face of the excavator 6. The earth pressure adjusting plate 35 has a function of stabilizing the face by moving back and forth in the existing concrete pipe 3 in response to the partial pressure and local pressure of the face accompanying the crushing work of the existing concrete pipe 3 by the excavator 6.

  The central opening 31 formed in the ring-shaped face plate 9 is used by an operator to take in existing excavated objects such as concrete pipes and grounds that have been cut and crushed by the roller bit 10 into the excavator main body 7, so It can also function as an entrance / exit when entering / exiting into the existing concrete pipe 3 in the wheel removal step and the steel joint removal removal space protection step.

  The excavated matter taken into the excavator main body 7 is conveyed from the start shaft 1 to the outside of the excavation through the excavated material conveying means 34. A pressure air cylinder 11 and a semi-shield cylinder 12 are connected to the rear portion of the excavator main body 7. Before and after the connection of the pressure cylinder 11 and the semi-shield cylinder 12 may be reversed. The pressure cylinder 11 is for bringing the inside of the existing concrete pipe 3 into a pressurized state during the reconstruction work, and includes at least two air lock doors (not shown) at the front and rear. The semi-shield barrel 21 is provided with a semi-shield jack (not shown), and has a function of pressing the excavator main body 7 toward the excavation face and controlling the excavation direction of the excavator main body 7. However, the pressure cylinder 11 and the semi-shield cylinder 12 are installed as necessary. When there is no fear of intrusion of groundwater from the natural ground, or when the press to the digging face of the digging machine main body 7 is pushed, the jack 16 It can be omitted if it can be constructed only with

  Along with the progress of the existing concrete pipe crushing and removal process, the new pipe promotion and embedding process will be implemented. The new pipe propulsion embedding process is performed by the main push jack 16 installed in the start shaft 1.

  As described above, according to the buried pipe remodeling method of the present invention, the existing concrete pipe is obtained by removing the steel joint in advance and filling the removed trace with solid ground protection material in the steel joint removal trace void protecting step. In addition, the ground can be stabilized and the existing concrete pipe can be crushed and removed by an excavator having a normal cutter head.

  1: start shaft, 2: reach shaft, 3: existing buried pipe, 4: new pipe, 5: steel joint, 6: excavator, 7: excavator body, 8: drive motor, 9: face plate, 10: Roller bit, 11: Pressure cylinder, 12: Semi-shield cylinder, 13: Pressure lock, 14: Air supply equipment, 15: Air supply pipe, 16: Main push jack, 17: Body cutting cutter device, 18: Strut member, 19: Vertical Part: 20: horizontal part, 21: grounding part, 22: horizontal connecting member, 23: cutter holding member, 24: circumferential driving means, 25: cutter, 26: cutter driving means, 27: mold, 28: mold Support member, 29: mountain retaining material supply pipe, 30: ground protection material, 31: central opening, 32: mountain retaining cylindrical part, 33: slit cutter, 34: excavated material conveying means, 35: earth pressure adjusting plate

Claims (5)

Excavating start and end shafts at the start and end positions of existing concrete pipes buried underground;
A step of arranging an excavator equipped with a cutter head on the start shaft;
Steel joint removal process for removing steel joints of existing concrete pipes sequentially from the start shaft,
The steel joint removal removal gap protection process that fills and solidifies the ground protection material in the part from which the steel joint has been removed ,
An existing concrete pipe crushing and removing step of starting the excavator, crushing and removing the existing concrete pipes in which the steel joints are removed and the ground protection material is filled,
A new pipe propulsion embedding process for propelling and embedding new pipes according to the progress of the existing concrete pipe crushing and removing process,
A buried pipe reconstruction method characterized by having   In the steel joint removal process, the steel blade is cut by cutting the steel joint in the circumferential direction and axial direction using a cutting cutter that can move in the axial direction and circumferential direction with the direction of the rotary blade being variable. The buried pipe reconstruction method according to claim 1, wherein the buried pipe reconstruction method is removed.   The buried pipe reconstruction method according to claim 1, wherein in the steel joint removal step, an operator enters the existing concrete pipe and performs cutting and crushing using a cutting tool.   4. The steel joint removal process, the steel joint removal trace clearance protection process, the existing concrete pipe crushing removal process, and the new pipe propulsion embedding process are performed under pressure. The buried pipe reconstruction method described in 1.   5. The buried pipe reconstruction according to claim 1, wherein a movable earth pressure adjusting plate is installed in the existing concrete pipe in front of the excavation face of the excavator in the existing concrete pipe crushing and removing step. Construction method.

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