JP5801166B2 - Existing pipe repair method - Google Patents

Description

  The present invention relates to a method for repairing existing pipes such as sewer pipes.

  Sewer pipes deteriorate with long-term use, and their useful life is generally about 50 years. Therefore, sewer pipes that have exceeded their useful lives are increasing year by year. Therefore, repair management for aging is an important task.

  In general, for pipes buried in the ground such as sewer pipes, it is inevitable that various deformations due to the passage of years since installation, for example, generation of steps due to deviation or change in diameter, etc. will occur. In addition, even if no deformation occurs, it is necessary to repair, renovate, or replace with aging, and because of these various circumstances, existing pipes need to be repaired at certain times. is there.

  As a method for repairing existing pipes such as sewer pipes, for example, repair methods using a lining material made of thermoplastic resin or photocurable resin are known (Patent Documents 1 and 2). In these repair methods, the folded lining material is drawn into the existing pipe and introduced, and then a pressurized fluid such as air is fed into the introduced tubular lining material and cured in a state of being in close contact with the inner surface of the existing pipe. As a result, an inner layer tube is formed.

  According to such repair by the inner layer pipe, since the inner surface of the existing pipe is covered by the impermeable inner layer pipe, the existing pipe where the crack has occurred and the joint portion of the plurality of pipe units constituting the existing pipe are provided. Even if a slight gap is generated, intrusion of groundwater into the existing pipe and leakage from the existing pipe are prevented, and the strength of the existing pipe is improved.

Japanese Patent Laid-Open No. 2001-232684 Japanese Patent Laid-Open No. 5-212792

  However, due to earth pressure, ground displacement, etc., as shown in FIG. 21, when the joint portion of the pipe unit constituting the existing pipe 100 is displaced and a step (a) or bending (b) occurs. Since the formed inner layer pipe also has a shape corresponding to the level difference and deformation, it is impossible to recover the pipe shape after the repair to the original normal circular shape. Further, as shown in FIG. 21 (c), when there is a separation between the tube units, the lining material bulges outward from the gap when forming the inner layer tube. The strength is low.

  In this way, when the inner layer pipe is formed with deformation such as a step, a bend, or a separation remaining, it is difficult to make the repair region a pipe having an appropriate circular cross section. There is a situation in which the strength cannot be sufficiently secured and the pipeline function cannot be completely normalized.

  This invention is made | formed in view of such a situation, The objective is to provide the existing pipe repair method including the process of recovering the existing pipe which aged and deform | transformed into an appropriate shape.

In order to achieve the above object, the existing pipe repair method according to claim 1 is:
An investigation process for investigating the deterioration state of the existing pipe from the inside of the existing pipe, and examining at least the inner diameter and deformation,
Based on the inner diameter data obtained by the investigation process and the degree of deformation,
(A) a cutting process of cutting the inner wall of the existing pipe into a circular cross section by an inner wall cutting machine;
(B) a pressing process for pressing the inner surface of the existing pipe outward from the inside in order to form an appropriate circular cross-section for the existing pipe, and correcting the circular section into a circular shape;
A circular recovery step of selecting at least one of the processes and securing a continuous circular cross-sectional area by performing the selected process;
It is characterized by including.

  According to this configuration, by examining the existing pipe from the inside in advance, it is appropriate to recover the circular shape of the cross section according to the degree of deterioration (reduction or enlargement of the inner diameter, step, crack, flatness, etc.). Since the process (cutting process and / or pressing process) is selected, the circular shape can be restored over the entire range in the repair target of the existing pipe by performing the selected process. Moreover, according to the cutting process or the pressing process, it is possible to form a continuous circular cross-sectional area of the axial line over the entire repair area. That is, since a continuous cylindrical space region is formed in the axial direction in the repair region of the existing pipe, it is possible to recover the pipe line in a good state in which no step is generated on the inner surface. Therefore, the cross-sectional shape of the existing pipe is restored to the state before the deformation, and it is possible to ensure the flow-down capability as the pipe line.

  In addition, as will be described later, when a water stop pipe, a reinforcing pipe, or a cylindrical partial covering is mounted on the inner surface of an existing pipe as necessary, a pipe base that is to be mounted is constructed by a circular recovery process. Therefore, it is possible to further ensure the strength with the water stop pipe, the reinforcing pipe or the partial covering.

The existing pipe repairing method according to claim 2 takes into account the investigation data in the investigation step and the processing effect in the circle restoration step after the circle restoration step,
(C) Partial repair processing for covering a part of the inner surface of the existing pipe with a cylindrical partial covering,
(D) a water stop treatment for covering a water stop pipe having water stop on the inner surface of the existing pipe;
(E) Reinforcing treatment for covering the inner surface of the existing pipe with a reinforcing pipe,
At least one process is selected, and the selected process is further performed.

  According to this configuration, after performing the circular recovery process, when the strength of the existing pipe is partially or totally insufficient, or when the strength is sufficient, cracks are generated and the water stoppage is insufficient. Can be provided with sufficient strength and water-stopping performance by covering the inner surface of the existing pipe with a partial covering, a water stop pipe or a reinforcing pipe. Further, by appropriately selecting each treatment, the repair cost can be reduced, which is economically advantageous.

  The existing pipe repair method according to claim 3, wherein the inner wall cutting machine includes a cutter unit that cuts the inner wall of the existing pipe, and a rotation prevention unit that prevents rotation of the cutter unit. A motor disposed so that the shaft is parallel to the traveling direction, an arm extending radially outward from the shaft, and a cutting blade attached to the arm, wherein the cutting blade is provided on the shaft. It moves in the axial direction of the existing pipe while rotating around the axis in the circumferential direction of the existing pipe.

  According to this configuration, the cutting blade rotates in the circumferential direction around a shaft arranged in parallel to the traveling direction (axial direction of the existing pipe), so that an accurate cross-sectional shape with the center as an axis is formed in the existing pipe. The wall can be cut. In addition, even when a step or bend occurs in the existing pipe, the portion can be continuously cut, so that it is possible to perform circular recovery close to the designed inner diameter of the pipe before deformation. .

  The existing pipe repairing method according to claim 4, wherein the rotation prevention unit is connected to the rear of the cutter unit in the running direction, has a pressing member that is pressed in contact with an inner wall of the existing pipe, and the outer side of the cutting blade. The length in the running direction from the end to the rear end of the pressing member is longer than the diameter of the rotating circle when the cutting blade rotates.

  According to this configuration, when cutting a deformed portion such as a step or a bend of an existing pipe, cutting with a cutting blade can be performed at a gentler angle, so that the portion where the deformed portion has occurred after cutting can be performed. The inner surface of the existing pipe can be made a gentle slope, and it becomes possible to recover a circular shape having a high function of sewage flow.

  The existing pipe repairing method according to claim 5, wherein the pressing process is a push-back mechanism that pushes back an inwardly deformed portion of the existing pipe, and the push-back mechanism is movable in the existing pipe. And a moving-back mechanism.

  According to this configuration, when a deformation such as a large buckling or bending occurs in the existing pipe, the portion can be directly pressed back by the push-back mechanism. It becomes possible to return to the shape. For this reason, it is possible to effectively recover the circular shape particularly when a large deformation occurs locally in the pipe line.

  The existing pipe repair method according to claim 6, wherein the pressing process is performed by expanding the diameter-expanded part of an all-around diameter expander having a diameter-expanded part that expands in the radial direction of the existing pipe. Features.

  According to this configuration, when the inward deformation of the existing pipe is very large or when it is determined that a large number of cracks have occurred and the strength is significantly reduced in the investigation step, the existing pipe is desired. By expanding the diameter so as to be the pipe diameter, it is possible to secure a pipe having a circular cross section.

  The existing pipe repairing method according to claim 7 is characterized in that the cutting process is selected when circular recovery by cutting is possible while leaving the wall portion of the existing pipe.

  According to this configuration, it is possible to smoothly perform the circular recovery process by appropriately determining whether or not cutting by the inner surface cutting machine is possible in consideration of the cutting thickness by the inner surface cutting machine and the height of the step of the existing pipe. Is possible.

  In the existing pipe repairing method according to claim 8, when the circular recovery process is performed before the circular recovery process, a portion that is larger than the circular cross section of the circular sectional area of the continuous axis is expected to be generated. In this case, the method further includes a step of applying a gap filling agent to the portion and curing the gap filling agent.

  If there is a deformed part such as a gap or a crack in the existing pipe, even if the cutting process or the pressing process is performed, the appropriate cross-sectional circular state cannot be recovered only for that part, and there is a part where the cross section is locally large. Although it may occur, by applying a gap filler in advance and curing to fill the gaps and cracks, the deformed part such as the gaps and cracks has the same diameter as other parts after the cutting process or pressing process. It is possible to have a circular cross section. Therefore, it is possible to form a water stop pipe and a reinforcement pipe to be mounted as necessary as a high quality pipe without poor curing and deformation.

  According to the present invention, the existing pipe is previously investigated from the inside, and depending on the inner diameter and the degree of deformation, appropriate processing (cutting processing and / or pressing processing) is performed to recover an appropriate circular cross section. The circular cross section can be restored over the entire range of the existing pipe to be repaired. According to the cutting process and / or the pressing process, a continuous circular sectional area of the axial line can be formed, so that the existing pipe inner surface shape can be restored to the state before deformation.

It is explanatory drawing which shows an example of an investigation process. It is explanatory drawing which shows the example which gave the gap filling agent. It is explanatory drawing which shows the example of the inner surface cutting by an inner surface cutting machine. It is detailed explanatory drawing which shows the example of cutting when a level | step difference arises. It is detailed explanatory drawing which shows the example of cutting when bending arises. It is detail explanatory drawing which shows the example of cutting when separation arises. It is detailed explanatory drawing which shows the example of cutting when flatness arises. It is the schematic which shows the deformation | transformation condition of the existing pipe | tube which it is preferable to select a press process. It is the schematic explaining an example of a press process. It is explanatory drawing which shows the example with which the partial covering body installed as needed after a circular recovery process was covered. It is the schematic which shows the example by which the water stop pipe or the reinforcement pipe | tube installed as needed after a circular recovery process was covered. It is a side view which shows an example of an inner wall cutting machine. It is explanatory drawing of the state in which the pushback apparatus is installed in the existing pipeline. It is operation | movement mechanism explanatory drawing of the structure of a pushing-back apparatus. It is the front view (a) and side view (b) at the time of diameter reduction of an all-around diameter expanding machine. It is the front view (a) and the side view (b) at the time of diameter expansion of an all-around diameter expander. It is explanatory drawing which shows the press process by an all-around diameter expanding machine. It is explanatory drawing which shows the press process by an all-around diameter expanding machine. It is the perspective view (a) which shows an example of a partial covering, and the expanded view (b) of a base. It is explanatory drawing which shows the construction process of a partial covering. It is sectional drawing which shows the example of the deterioration state of the existing pipe.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In addition, the dimensional ratio of each component on each drawing does not necessarily match the actual dimensional ratio.

  FIG. 1 is a schematic view showing an example of an existing pipe inspection process. In the present embodiment, an example of repairing the existing pipe 100 from the end on the manhole 200 side to the end on the manhole 300 side is shown.

  First, as a preparatory step, high pressure water on the inner surface of the existing pipe 100 is sprayed and cleaned with an in-pipe cleaning vehicle or the like to remove foreign matters such as dirt on the inner surface, deteriorated concrete, and mixed tree roots. Next, a blocking member (not shown) is installed on the upstream side of the manhole 200 and the downstream side of the manhole 300 in order to block the flow of sewage in the existing pipe 100.

  And the investigation apparatus 10 which investigates the deterioration state of an existing pipe is arrange | positioned in the existing pipe 100. FIG. The investigation device 10 includes a CCD camera, and the state of deterioration such as an inner diameter and deformation in the existing pipe 100 is investigated by imaging with this. The investigation device 10 investigates the deterioration state in the existing pipe while moving by moving in the existing pipe 100, and the occurrence position of the deformation such as reduction or expansion of the inner diameter, flatness, step, crack, separation, deposit, etc. Investigate the degree. This figure shows an example in which a step 30, a separation 32, and a deposit 34 are generated in the existing pipe 100. The investigation device 10 is connected to an analysis device (not shown) placed on the ground via a cable 22, and deformation and the like are analyzed in detail in the analysis device.

  Next, based on the inner diameter data obtained by the above investigation and the degree of deformation, it is selected whether to perform a cutting process for cutting the existing pipe inner wall or a pressing process for pressing the existing pipe inner wall outward from the inside. Alternatively, both processes may be performed by performing a cutting process on a part of an existing pipe to be repaired and performing a pressing process on another part. However, from the viewpoint of facilitating the construction work, it is preferable to appropriately select either the cutting process or the pressing process.

  As a selection criterion, for example, when circular recovery by cutting processing is possible, cutting processing is selected. Whether or not the circular recovery by the cutting process is possible is determined according to a situation such as a flatness level and a level difference. For example, when the inner diameter is measured in the above survey, the degree of reduction or expansion before the deformation, that is, the degree of reduction or enlargement compared to the inner diameter at the design stage is confirmed, so that even if cutting is performed, the wall portion of the existing pipe is predetermined. Judgment is made based on whether or not the thickness can be left. When it is determined that the circular recovery by the cutting process is not possible, the pressing process is selected. Specific criteria for selection include, for example, cutting processing when the degree of deformation of an existing pipe is less than 5% of the diameter of the pipe, and pressing processing when the degree of deformation is 5% or more.

  Further, before performing the cutting process or the pressing process, as shown in FIG. 2, a portion that is expected to be larger than the circular cross section of the circular area of the continuous axial line secured by the cutting process or the pressing process, that is, A gap filling agent 24 such as mortar is applied to a portion where deformation such as a step or separation occurs by injection, application, injection, or the like, and cured. Thereby, it becomes possible to make a deformation | transformation part, such as a clearance gap and a level | step difference, into the cross-sectional circular shape of the same diameter as another part by the cutting process or press process mentioned later.

  FIG. 3 is a schematic diagram illustrating a cutting process when a cutting process is selected. The cutting processor 12 (which will be described in detail later) includes a cutting blade that rotates in the circumferential direction. In the illustrated example, the cutting processor 12 is moved by being pulled by the tow rope 38 from the end of the existing pipe 100 toward the manhole 200 toward the manhole 300. The state where the inner wall of the existing pipe 100 is being cut is shown.

  FIG. 4 shows a detailed view of (a) before and (b) after cutting by the inner surface cutting machine when a step is generated. As shown in the figure, there is a step in the joint portion of the pipe unit bodies 100a and 100b constituting the existing pipe before cutting (a). A gap filling agent 24 is applied to the lower surface in the vicinity of the step so that the cross-section after cutting is circular, and the broken line indicates a cutting surface on which cutting is performed with an internal cutting machine. The inner surface cutting machine 12 moves in the direction of the arrow 500 while the cutting blade 118 rotates in the circumferential direction of the existing pipe. As a result, the inner surface of the existing pipe is cut to the broken line, and a circular cross-sectional area centering on the continuous axis (one-dot chain line) 50 is formed as shown in FIG.

  FIG. 5 shows detailed views of (a) before and (b) after cutting by the inner surface cutting machine when bending occurs. As shown in the figure, before cutting (a), the pipe unit bodies 100a and 100b are not connected in a completely parallel state, and have a slight inclination. In this figure, a gap filling agent 24 is sprayed on the upper surface of the periphery of the joint portion of the pipe unit bodies 100a and 100b. A broken line indicates a cutting surface to be cut by an inner surface cutting machine. After cutting, the broken line is cut to a continuous axis (one-dot chain line) 50 as shown in FIG. 5B. A cross-sectional circular region is formed.

  FIG. 6 shows detailed views of (a) before and (b) after cutting by the inner surface cutting machine when separation and deposits occur. As shown in the figure, the tube units 100a and 100b are separated from each other before the cutting (a), and a gap 32 is generated. Further, a deposit 34 is generated on the surface of the tube unit 100b. The gap 32 is cut after being injected with a gap filling agent 24 such as mortar and cured. The cutting is performed along the inner surfaces of the tube units 100a and 100b. After cutting, unnecessary portions of the gap filling agent 24 and the deposit 34 are removed, and a continuous axis line is obtained as shown in FIG. 6B. A circular area with a cross section centered on (alternate long and short dash line) 50 is formed.

  FIG. 7 is a cross-sectional view (a-1) and a vertical cross-sectional view (a-2) before cutting, and a cross-sectional view (b-1) and a vertical cross-sectional view after cutting (b- 2). As in (a-1), the existing pipe 100 is deformed into a flat shape so that its cross-sectional shape spreads laterally due to earth pressure or the like. A broken line indicates a cutting surface that is cut by an internal cutting machine. After cutting, the broken line is cut to a continuous axis (see FIGS. 7B-1 and 7B-2). A circular area with a cross section centering on the alternate long and short dash line 50) is formed.

  As described above, when deformation such as a step, bending, separation, flattening, etc. occurs, circular recovery is performed by cutting with an internal cutting machine.

  FIG. 8 is a schematic diagram showing a state of an existing pipe for which the pressing process is preferably selected. Press when it is difficult to secure a circular cross-section by an internal cutting machine, such as when the step 30 generated in the existing pipe 100 is large as shown in the figure, or when the existing pipe is cracked and the strength of the existing pipe is extremely reduced. Processing is selected.

  As a device that can be used for the pressing process, for example, a push-back device having a push-back mechanism that pushes back a deformed portion inward and a moving mechanism that makes the push-back mechanism movable, or an existing pipe An all-around diameter expanding machine or the like having an expanded diameter portion that expands in the radial direction can be used.

  FIG. 9 shows an example of the pressing process by the push-back device. The push-back device 18 has a first structure 26 and a second structure 28, and moves while being pulled by the puller 42 toward the manhole 300 from the manhole 200 side in the existing pipe 100. After the first structure 26 is stopped at the stepped portion of the existing pipe, the inner surface of the existing pipe is pushed back outward (in the direction of the arrow), thereby lifting the inner wall of the pipe and restoring the circular cross section. The The second structure 28 rotates the swivel jack mechanism 27 and rotates the first structure 26 at an arbitrary angle.

  In addition, since the existing pipe can be destroyed by this operation after the pressing process by the push-back device, the all-around diameter expander, etc., an anti-scattering agent injector 20 is provided immediately behind the push-back device 18 as shown in the figure. After the pressing process is completed, an anti-scattering agent such as mortar or water glass is injected to crush the existing pipe fragments that are crushed so as not to fall. The anti-scattering agent is supplied to the anti-scattering agent injector 20 via the supply pipe 21 from an anti-scattering agent supply device (not shown) arranged on the ground. The details of the push-back device and the all-around diameter expander will be described later, but an antiscattering agent injector may be provided in the example described there.

  As described above, the circular recovery of the existing pipe 100 is performed by the pressing process.

  In addition, after the round recovery process by the cutting process and / or the pressing process, the cylindrical partial covering is covered on a part of the inner surface of the existing pipe in consideration of the survey data in the survey process and the processing effect in the circular recovery process. Select and select at least one of the following: the partial repair process to be installed, the water stop process that covers the inner surface of the existing pipe with a waterproof pipe, and the reinforcement process that covers the inner surface of the existing pipe Further processing can be performed.

  That is, even when the circular shape of the cross section is recovered, if the strength is partially or entirely insufficient or if it is determined that the water-stopping property is not sufficient, the cylindrical partial covering is shown in FIG. By covering the body 14 or by covering the existing pipe inner surface with the water stop pipe or the reinforcing pipe 16 as shown in FIG. 11, it is possible to sufficiently recover the mechanical strength and water stoppage. In particular, since the strength of the joint portions of the plurality of pipe unit bodies constituting the existing pipe is liable to be reduced, it is effective to install a partial covering at that portion. Alternatively, both treatments may be performed by repairing a part of an existing pipe to be repaired with a partial covering and repairing another part with a water stop pipe or a reinforcing pipe. Details of the partial covering 14 and the water stop pipe or the reinforcing pipe 16 will be described later. In addition, it can be judged based on the assumption effect of each process of the investigation data in the investigation process mentioned above, and a circular recovery process whether strength and water stoppage are enough.

  Hereinafter, the cutting process and the pressing process, the water stop pipe, the reinforcing pipe, and the partial covering will be described in detail.

[Cutting]
As an inner wall cutting machine which can be used for a cutting process, the inner wall cutting machine illustrated below is mentioned, for example.

  As shown in FIG. 12, the inner wall cutting machine A includes a cutter unit 110, a towed portion 120 connected to the tip of the cutter unit 110, and a rotation prevention unit 130 connected to the rear end of the cutter unit 110. It is configured.

  The inner wall cutting machine A is inserted into the existing pipe 100 that constitutes a sewer pipe or the like with the towed part 120 at the top. Then, one end of a tow rope (not shown) such as a rope or a wire is connected to the eyebolt 121 constituting the towed part 120, and the other end of the towed line is pulled with a winch or the like, so that the towed part 120 is at the head Travel in the direction of the arrow in FIG. Further, the inner wall 101 of the existing pipe 100 is cut by the cutter unit 110 while traveling inside the existing pipe 100.

  The cutter unit 110 includes an electric motor 111, a shaft 112 that rotates by driving of the electric motor 111, a speed reducer 113 that connects the electric motor 111 and the shaft 112, a disk 114 fixed to the shaft 112, and a disk 114. And a plurality of cutting blade portions 115 arranged on the outer periphery of the.

  The electric motor 111 is disposed in a posture that is tilted sideways so as to be parallel to the traveling direction of the inner wall cutting machine A. Further, the pinion shaft of the electric motor 111 and the shaft 112 are connected via a planetary gear reducer 113, and the rotational speed of the electric motor 111 is reduced to increase the torque.

  The cutting blade portion 115 includes an arm 116, a cutting blade base 117, a cutting blade 118, and an adjustment bolt 119. The arm 116 is fixed in a cantilever manner with bolts in holes formed at four locations on the outer periphery of a disk 114 fixed to the shaft 112, and is tilted backward with respect to the traveling direction of the inner wall cutting machine A. An L-shaped cutting blade base 117 capable of sliding in the longitudinal direction is attached to the upper surface of the arm 116, and the cutting blade 118 is attached on the cutting blade base 117.

  Further, an adjustment bolt 119 is screwed into a screw hole drilled in the protruding portion of the cutting blade base 117, and one end of the adjustment bolt 119 is in contact with the end portion of the arm 116. Therefore, by rotating the adjustment bolt 119, the cutting blade base 117 can be swung with respect to the arm 116, and the protruding state of the cutting blade 118 can be adjusted.

  Thereby, the cutting thickness in the inner wall 101 of the existing pipe 100 can be adjusted. Even if the cutting blade 118 is worn due to continued cutting, the inner wall 101 can be cut by a new portion of the cutting blade 118 by rotating the adjustment bolt 119 to project the cutting blade 118, so that the cutting thickness is constant. Can be kept in.

  The guide wheel 144 provided on the support members 141 and 142 is rotatable in the traveling direction of the inner wall cutting machine A. When the inner wall cutting machine A is pulled, the guide wheel 144 rotates and smoothly moves the existing pipe. It is possible to run in the 100.

  The rotation prevention unit 130 includes a guide shaft 131 disposed in parallel with the traveling direction of the inner wall cutting machine A, a disk-shaped base portion 132 that is slidably fitted to the guide shaft 131, and an operation of the air cylinder 136. A pair of opening and closing members 134 that are opened and closed by the above and a pressing member 137 attached to the opening and closing member 134.

  In the rotation prevention unit 130, the air cylinder 136 is extended to open the opening / closing member 134, whereby the pressing member 137 is pressed against the inner wall 101, and the base 132 is attached to the existing pipe 100 by friction between the pressing member 137 and the inner wall 101. Fixed against. Further, since the base portion 132 is not rotatable with respect to the guide shaft 131, the rotation of the cutter unit 110 connected to the guide shaft 131 can be prevented by fixing the base portion 132 to the existing pipe 100. .

  Next, a method for cutting the inner wall 101 by the inner wall cutting machine A will be described.

  After the inner wall cutting machine A is introduced into the existing pipe 100, the air cylinder 143 of the guide means 140 is extended, and the guide wheel 144 attached to the lower support member 141 and the upper support member 142 is pressed against the inner wall 101, and the cutter unit 110 is fixed with respect to a direction perpendicular to the axis of the existing pipe 100.

  Next, the air cylinder 136 of the rotation prevention unit 130 is extended and the pressing member 137 is pressed against the inner wall 101 to fix the rotation prevention unit 130 to the existing pipe 100.

  Next, the electric motor 111 is driven, and the cutting blade 118 is rotated around the electric motor 111 to cut the inner wall 101 with a predetermined thickness to expose the sound surface. Alternatively, the existing pipe 100 deformed due to aging deterioration is corrected to a circle. At the same time, the tow rope connected to the eyebolt 121 is pulled with a winch or the like to run the inner wall cutting machine A.

  At this time, since the shaft 112 is concentric with the existing pipe 100 by the guide means 140, the inner wall cutting machine A can cut the entire circumference of the inner wall 101 with an equal thickness. Further, when the pressing member 137 is pressed against the inner wall 101, the electric motor 111 can be prevented from rotating. In addition, since the guide shaft 131 is connected to the cutter unit via the joint 150, the base 132 swings with respect to the guide shaft 131, and the cutter unit 110 can be moved in the traveling direction while preventing the cutter unit 110 from rotating. It becomes. Even if the air pressure of the air cylinder 136 is decreased and the pressing force of the pressing member 137 against the inner wall 101 is weakened, the same effect as described above can be obtained.

  Since the base 132 of the rotation prevention unit 130 is fixed to the existing pipe 100, the base 132 swings relatively toward the rear end of the guide shaft 131 as the inner wall cutting machine A travels.

  When the base 132 reaches the rear end of the guide shaft 131, the air cylinder 136 of the rotation prevention unit 30 is contracted to separate the pressing member 137 from the inner wall 101. Then, the base 132 moves to the front end of the guide shaft 131 by the bias of the coil spring 133. The base 132 can be fixed to the existing pipe 100 by extending the air cylinder 136 again. In this way, while repeatedly fixing and releasing the rotation prevention unit 130, the inner wall cutting machine A is run to cut the inner wall 101 in a predetermined region.

  In addition, when the joint of the existing pipe 100 is bent or a gap or a step is formed, when the inner wall cutting machine A is run inside the existing pipe 100, when the cutter unit 110 passes through the joint, the joint 150 bends. Therefore, even if the joint of the existing pipe 100 is bent or a gap or a step is formed, the inner wall cutting machine A can travel without being caught by the joint and can cut the inner wall 101.

  In addition, since the arm 116 to which the cutting blade 118 is attached is inclined rearward with respect to the traveling direction, the cutting blade 18 can be connected to the existing pipe 100 even if the seam of the existing pipe 100 is bent or a gap or a step is formed. The cutting of the inner wall 101 can be continued without being caught on the end surface of the inner wall 101.

  Furthermore, the length L in the running direction from the outer end 118b of the cutting blade 118 to the rear end 137b of the pressing member 137 of the automatic prevention unit 130 is configured to be longer than the diameter D of the rotating circle around which the cutting blade 118 rotates. It is preferable. Thereby, when cutting a deformed portion such as a step or a bend of the existing pipe 100, the cutting by the cutting blade 118 can be performed at a gentler angle, so that a step or a bend that has occurred after the cutting has occurred. The inner surface of the pipe is cut into a gentle slope, and a circular shape with a high sewage flow function can be recovered. In particular, the length L is preferably at least twice the diameter D.

  As described above, the cutting process of the inner wall of the existing pipe by the inner wall cutting machine is completed.

[Pressing process]
Next, an example of a push-back device that can be used for the pressing process in the circular recovery step will be described.

  FIG. 13 shows a state in which the push-back device 210 is installed. In the existing pipe, the upper part of the pipe unit body 100a is shifted downward and the pipe diameter is narrowed.

  In this figure, the push-back device 210 advances from the manhole 200 in the 300 direction, and the push-back device 210 is pulled toward the manhole 300 by a pulling mechanism as a moving mechanism. As shown in the figure, the traction mechanism is composed of a chain 212 coupled to the push-back device 210 and a traction drive device (not shown) installed on the ground to wind up and pull the chain 212.

  In this embodiment, the push-back device 210 is composed of two main structures. That is, the first structure 214 as a correction device that corrects the pressing of a portion where the buckling or deformation is actually generated in the existing pipeline, and the swivel jack mechanism 216 as the first structure 214 and the arm portion. The second structure body 218 is joined by

  FIG. 14 illustrates an example of a specific structure of the first structure body 214. As shown in the figure, the first structure 214 has an expansion / contraction mechanism, and the expansion / contraction mechanism includes an upper pressing plate 220 whose interval expands and contracts in a direction perpendicular to the tube axis direction of the push-back device 210. And a bottom pressing plate 222. Each of the pressing plates 220 and 222 is formed in an arc shape whose surface is convex outward, and preferably has an arc shape with a curvature close to the curvature of an existing pipe having a normal shape.

  Further, as shown in the figure, the main body 224 is provided with a hydraulic mechanism having five pistons 226, and the interval between the upper pressing plate 220 and the bottom pressing plate 222 is automatically expanded by this hydraulic piston device. And it is made to shrink again.

  As shown in FIG. 13, the second structure 218 is installed in front of the first structure 214 in the traveling direction. The second structure 218 is coupled to the chain 212 and is pulled by the traction mechanism. The above-described swivel jack mechanism 216 is coupled to the second structure 218, and the main role of the second structure 218 is to rotate the first structure 214 coupled to one end by the swivel jack mechanism 216. It is to let you.

  Although a drive mechanism for rotating and expanding / contracting the swivel jack mechanism 216 is not shown, a general electric motor or hydraulic mechanism is used. The second structure 218 has an expansion / contraction mechanism (the structure shown in FIG. 14) that is substantially the same as that of the first structure 214, and the upper pressing plate 228 and the bottom pressing plate 230 are extended. The inner wall of the existing pipe 100 is pressed, and the swivel jack mechanism 216 is rotated and the first structure 214 is rotated at an arbitrary angle in a stable state of the second structure 218 by the pressing.

  Note that an elastic member for enhancing the adhesion to the inner wall of the pipe line is preferably attached to the surface of the first structure body 214. For example, attaching rubber or urethane material. When such an elastic member is attached, not only can the inner wall of the pipe be pressed more evenly, but an instantaneous hardening material is injected into the ground side from the surface of the upper pressing plate 220 as shown in FIG. When the mechanism 221 is installed and the mechanism 221 is used, leakage of the curing material can be effectively prevented. As the hardener, for example, an immediately hardened cement or water glass is used. The injection of the hardener is preferably used in a situation where the existing pipe 100 is in a considerably broken state, the hardener can be injected, and the shape cannot be maintained only by pushing back.

  In order to press the existing pipe outward from the inside using this push-back device, the first structure 214 is moved so that the position of the first structure 214 becomes a deformed portion of the existing pipe, and then the expansion / contraction of the second structure 218 is performed. After the upper pressing plate 228 is raised by the mechanism to stabilize the second structure 218 by the upper pressing plate 228 and the bottom pressing plate 230, the upper pressing plate 228 is pressed by the expansion / contraction mechanism of the first structure 214. This is done by raising the plate 220 and pushing back the existing pipe part that has fallen.

  In addition, after repeating this operation | movement and completing the pushing-back operation | movement of a fallen part, the 1st structure 214 and the 2nd structure 218 are collect | recovered from the manhole 300 of the arrival side. The pressing process by the push-back device is performed as described above.

  Next, an example of the all-around diameter expanding machine that can be used for the pressing process of the present invention will be described.

  FIG. 15 shows an example of the all-around diameter expanding machine, and (a) and (b) show a front view and a side view in a reduced diameter state, respectively.

  As shown in FIG. 15 (b), the steel all-around diameter expander 310 has a plurality of front segments 311 and a plurality of rear segments 312 as the diameter-expanded portion, and the front segment 311 is arranged in the circumferential direction. Arranged and hinged to the rear of the propulsion head 313, the rear segment 312 is arranged circumferentially and hinged to the front of the rear end member 314. The front and rear segments 311 and 312 are hinged to each other adjacent to the front and rear. A hydraulic actuator (not shown) is provided inside the segments 311 and 312 arranged in an annular shape. By this hydraulic actuator, the segments 311 and 312 are expanded all around as shown in FIG. It is possible to move between a position where the diameter machine 310 is reduced in diameter and a position where the diameter of the entire circumference diameter enlargement machine 310 is increased as shown in FIG. A connecting ring 315 is provided at the tip of the propulsion head 313, and this connecting ring 315 is connected to a traction chain or a traction rod as will be described later.

  A plurality of plate-like members 316 are arranged in the circumferential direction at the center of the diameter expanding crusher 310. The rear part of the plate member 316 is bonded and fixed on the rear segment 312, the front part is not bonded and fixed to the front segment 311, and the plate member 316 is inclined forward when the diameter is reduced. ing. Then, as the inclination of the rear segment 312 changes due to the above-mentioned diameter expansion operation, the plate-like member 316 moves from the inclined state so that the inclination decreases, and in the state where the diameter is completely expanded, FIGS. ), The upper surface 316a of the plate-like member 316 is parallel to the axial direction of the existing pipe.

  Next, with reference to FIGS. 17 and 18, an example of expanding the diameter by pressing the existing pipe outward from the inside using this all-around diameter expanding machine 310 will be described. As shown in FIG. 17, the existing pipe 100 has a flat portion 60 in a part thereof.

  First, the all-around diameter expanding machine 310 is carried into the starting-side manhole 200, and the connecting ring 315 of this all-around diameter expanding machine is connected to the chain 341.

  Next, the all-around diameter expanding machine 310 is inserted into the existing pipe 100 from the propulsion head side. In the all-around diameter expanding machine 310, at least the portion in front of the segment 311 is smaller than the inner diameter of the existing pipe 100 when the diameter is reduced, and the desired diameter (that is, deformation of the existing pipe) is increased at the segments 311 and 312 when expanding. The inner diameter of the previous state).

  As shown in FIG. 17, the crushing and expanding machine 310 in the reduced diameter state is pulled by the chain 341 and moved to the place where the flat 60 of the existing pipe 100 is generated, and then the hydraulic operating device in the all-around diameter expanding machine 310 Hydraulic pressure is fed.

  By supplying the hydraulic pressure, the all-around diameter expanding machine 310 is expanded in diameter, and the pipe unit body 100a is pushed and expanded by the plate-like member 116 with a strong force. Then, as shown in FIG. 18, the tube unit is crushed, and the crushed portion is in a state where the tube diameter before deformation is secured. In addition, even if the existing pipe after a press process is a crushed state, it is in the state in which the fragment was connected by the reinforcing bar inside an existing pipe.

  Next, the entire circumference diameter expanding machine 310 is reduced in diameter by discharging the hydraulic pressure from the hydraulic actuator. In addition, an anti-scattering agent injector (similar to that indicated by reference numeral 20 in FIG. 9) is provided immediately behind the all-around diameter expanding machine, and after the diameter expanding crushing process is completed, an anti-scattering agent such as mortar is injected. Thus, it is preferable that the pieces of the existing pipe that have been crushed do not fall.

  As described above, the pressing process by the all-around diameter expanding machine is performed. After the pressing process, a partial covering, a water stop pipe, or a reinforcing pipe, which will be described below, is covered as necessary.

[Water stop pipe and reinforcement pipe]
A method of covering the inner surface of the existing pipe with the water stop pipe and the reinforcing pipe can be performed by a conventionally known method. For example, there is a method in which a tubular lining material made of a thermoplastic resin or a photo-curing resin is introduced by being drawn into an existing pipe and then cured while being in close contact with the inner surface of the existing pipe.

  As a method of forming a water stop pipe and a reinforcement pipe using a thermoplastic resin lining material, a polyvinyl chloride lining material folded into an omega shape or the like is drawn into the existing pipe and then introduced into the tubular lining. After pipe end plugs that allow the internal pressure to be adjusted at both ends of the material, a heating fluid such as steam is sent into the interior, and after being restored from a folded state to a tubular shape, it is further pressurized from the inside. The water stop pipe and the reinforcing pipe can be formed by cooling and hardening the lining material in close contact with the inner surface of the existing pipe.

  Further, as a method for forming a water stop pipe and a reinforcing pipe using a photo-curing resin lining material, a lining material containing a photo-curing resin is introduced into an existing pipe, both ends are sealed with a sealing member, and then a compressed fluid is used. In this state, the tubular lining material is brought into close contact with the inner peripheral surface of the existing pipe, and in this state, a light irradiation device is used to irradiate light such as ultraviolet rays from the inside to be cured. be able to.

  Although the existing pipe is sufficient in strength after the circular recovery step, the water stop pipe is covered when the groundwater can flow in due to a crack or the like. On the other hand, the reinforcing pipe is covered when the strength and water stoppage are insufficient after the circular recovery process. The water stop pipe and the reinforcement pipe are formed of the same material and the same method, and only the thickness is different. The water stop pipe may be a thin one that can at least prevent the inflow of groundwater.

[Partial covering]
The cylindrical partial covering body mentioned above can use the partial covering body illustrated below.

  As shown in the perspective view of FIG. 19A, the partial covering body includes a sleeve 401 and a base 410. The sleeve 401 includes a sleeve main body 402 formed in a cylindrical shape from a highly elastic material such as rubber, and an annular water stop 403 extending continuously in the circumferential direction on both sides in the busbar direction on the outer peripheral surface of the sleeve main body 402. Has been.

  The base 410 is made of a metal material or synthetic resin having excellent corrosion resistance, such as stainless steel, and after being deformed into a cylindrical shape that overlaps with each other so that one end is inside the other end, that is, a spiral shape. , Inserted into the sleeve 401.

  As shown in a developed perspective view in FIG. 19B, the base 410 has an elongated rectangular base portion 411, and an edge curved outward so as to accommodate the sleeve 401 along both side ends of the base portion 411. The edge 412 protects the sleeve 401 and stiffens the base 410 at the time of sewage flowing in the existing pipe 100 (see FIG. 20) and cleaning the pipe line by the edge 412. The strength is improved.

  In addition, a plurality of locking holes 413 are arranged in a row with a predetermined dimension on one end side of the base 410, and a locking piece that can be locked in the locking hole 413 with a predetermined dimension on the other end side. 414 is formed so as to protrude inward of the base 410 by cutting and raising processing, and a locking portion 415 that maintains the base 410 in an expanded state by the locking holes 413 and the locking pieces 414 (FIG. 19 ( (see a)).

  When repairing the existing pipe 100 using the partial covering body 400 configured in this way, first, the partial covering body 400 is mounted on the spreader 420 for expanding the diameter. As shown in FIG. 20, the spreader 420 has a cylindrical main body 421 and an expansion portion 422 that is fixed to the outer periphery of the main body 421 and expands into a balloon shape by supplying a pressure fluid, for example, compressed air. The partial covering 400 is mounted by inserting the inflated portion 422 into the base 410 in a contracted state.

  Next, the existing inner pipe 100 in which the inner peripheral surface 101 of the pipe covering 400 and the spreader 420 is washed in advance and subjected to surface treatment for removing mortar attached to the surface, invading tree roots, and the like as necessary. It is moved to a repair location such as a crack occurrence portion or a seam (not shown).

  Then, compressed air is supplied from a fluid source arranged on the ground via the hose 423 to expand the expansion portion 422. The base 410 of the partial covering 400 is expanded by the expansion of the expansion portion 422, and is expanded to such an extent that the locking piece 414 can be engaged with any one of the locking holes 413. As a result, the sleeve 401 disposed on the outer periphery of the base 410 is expanded in a cylindrical shape, and the waterstop 403 is pressed against the existing pipe inner surface 101 to be elastically deformed, so that there is no gap between the existing pipe inner surface 101 and the base 410. Seal.

  Next, the compressed air supplied to the expansion part 422 is discharged, and the expansion part 422 is contracted. When the expanding portion 422 contracts, a force for reducing the diameter of the base 410 by the restoring force of the sleeve main body 402 and the waterstop body 403 acts on the base 410, and the locking pieces 414 engage with any one set of locking holes 413. . As a result, the base 410 is slightly reduced in diameter, and this reduced diameter is absorbed by the sleeve body 402 and the waterstop 403 being slightly restored. Therefore, the sleeve main body 402 and the water blocking body 403 are held in a compressed state by the existing pipe inner surface 101 and the base 410, and the partial covering body 400 is installed in the existing pipe 100. Then, the spreader 420 is removed from the existing pipe 100.

  Thus, the partial repair by the partial covering of the existing pipe mentioned above is performed.

  In addition, this invention is not limited to said each embodiment, A various deformation | transformation is possible within the range of the summary of invention.

DESCRIPTION OF SYMBOLS 10 Investigation apparatus 12 Inner wall cutting machine 14 Partial covering body 16 Water stop pipe or reinforcement pipe 18 Push-back apparatus 20 Anti-scattering agent injection machine 21 Anti-scattering agent supply pipe 22 Cable 24 Gap filling agent 26 First structure 27 Turning jack mechanism 28 Second structure 30 Step 32 Clearance 34 Deposit 42 Traction body 60 Flat 100 Existing pipe 100a, 100b Pipe unit body 101 Existing pipe inner surface 110 Cutter unit 115 Cutting blade part 120 Pulled part 130 Anti-rotation unit 137 Pressing member 144 Guide wheel 210 Push-back device 214 First structure 216 Swivel jack mechanism 218 Second structure 220 Upper pressing plate 222 Bottom pressing plate 228 Upper pressing plate 230 Bottom pressing plate 310 All-around diameter expanding machine 311 Front segment 312 Rear segment 400 Partial covering Body 401 Sleeve 402 Sleeve body 403 Waterstop 410 Base 413 Locking hole 414 Locking piece 415 Locking part 200, 300 Manhole

Claims (8)

An investigation process for investigating the deterioration state of the existing pipe from the inside of the existing pipe, and examining at least the inner diameter and deformation,
Based on the inner diameter data obtained by the investigation process and the degree of deformation,
(A) a cutting process of cutting the inner wall of the existing pipe into a circular cross section by an inner wall cutting machine;
(B) a pressing process for pressing the inner surface of the existing pipe outward from the inside in order to form an appropriate circular cross section for the existing pipe, and correcting the circular section into a circular shape;
A circular recovery step of selecting at least one of the processes and securing a continuous circular cross-sectional area by performing the selected process;
Existing pipe repair methods including After the circular recovery step, considering the investigation data in the investigation step and the processing effect in the circular recovery step,
(C) Partial repair processing for covering a part of the inner surface of the existing pipe with a cylindrical partial covering,
(D) a water stop treatment for covering a water stop pipe having water stop on the inner surface of the existing pipe;
(E) Reinforcing treatment for covering the inner surface of the existing pipe with a reinforcing pipe,
The existing pipe repair method according to claim 1, wherein at least one process is selected, and the selected process is further performed. The inner wall cutting machine includes a cutter unit that cuts the inner wall of the existing pipe, and a rotation prevention unit that prevents rotation of the cutter unit,
The cutter unit includes a motor arranged such that a shaft is parallel to a traveling direction, an arm extending radially outward from the shaft, and a cutting blade attached to the arm,
3. The existing pipe repairing method according to claim 1, wherein the cutting blade moves in the axial direction of the existing pipe while rotating in the circumferential direction of the existing pipe around the axis of the shaft. 4. The rotation prevention unit is connected to the rear of the cutter unit in the traveling direction, and has a pressing member that is pressed in contact with the inner wall of the existing pipe,
The length in the running direction from the outer end of the cutting blade to the rear end of the pressing member is longer than the diameter of a rotating circle when the cutting blade rotates. Existing pipe repair method.   The pressing process is performed by a push-back device having a push-back mechanism that pushes back an inwardly deformed portion of the existing pipe and then moves the push-back mechanism within the existing pipe. The existing pipe repair method according to any one of claims 1 to 4, wherein:   5. The pressing process according to claim 1, wherein the pressing process is performed by expanding the diameter-expanding part of an all-around diameter expanding machine having a diameter-expanding part that expands in the radial direction of the existing pipe. The method according to item.   The method according to any one of claims 1 to 6, wherein the cutting process is selected when circular recovery by cutting is possible while leaving the wall portion of the existing pipe.   When the circular recovery process is performed prior to the circular recovery process, a portion that is larger than the circular cross section of the circular cross-sectional area of the continuous axis is expected to be formed. The method according to claim 1, further comprising a step of applying and curing the gap filling agent.

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