JP2011106537A - Method for regenerating existing pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for regenerating an existing pipe, capable of floating a pipe body with a stabilized attitude in flowing water flowing down inside the existing pipe and transporting safely. <P>SOLUTION: In the method for regenerating the existing pipe connecting a plurality of pipe bodies 1 inside the existing pipe S where the flowing water exists, the pipe body 1 is flown down and transported while controlling the flowing down speed of the pipe body by being floated in the flowing water, fixing one end of a cable body to the pipe body, and delivering the cable body from the upstream side, and is connected one by one in the destination of transportation. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method for rehabilitating existing pipes for connecting pipe bodies to rehabilitate existing pipes.

  Conventionally, as a method of rehabilitating existing pipes such as aged sewers, agricultural waterways, and power waterways, rehabilitating pipes are constructed by sequentially joining the pipes 100 each having the receiving port 100a and the outlet 100b formed at both front and rear ends. After that, a method of filling the gap between the existing pipe and the rehabilitation pipe with a backfill material has been proposed and implemented (see FIG. 10).

  This method will be described in detail in order. First, the pipe body 100 is sequentially suspended from the start side vertical shaft M1. Next, the support material 112 is lifted by the jack 111 of the transport carriage 110 and the tube body 100 is lifted up, and then transported into the existing pipe S using transport means such as a battery car for tube transport. Rehabilitation in which a plurality of pipes 100 are connected between the start side shaft M1 and the arrival side shaft (not shown) by sequentially joining the insertion port 100b to the receiving port 100a of the opposite tube body 100 at the transport destination. Build a tube. Finally, a backfilling material such as mortar is filled in the gap between the existing pipe S and the renovated pipe, and the renewed pipe is fixed to the existing pipe S.

  By the way, in the method of rehabilitating an existing pipe by connecting a plurality of such pipes, there is a risk that an electrical component may break down in an environment where there is running water such as sewage or agricultural water in the existing pipe. It is not possible to use a transportation means that is operated by electric power. Therefore, it is necessary to stop running water during the work or to carry out water changing work to bypass the running water.

  However, in existing pipes that are currently in use, there are many situations where the water flowing through the existing pipes cannot be easily stopped even temporarily. In addition, in the case of performing water change work to bypass running water, since the construction to lay the bypass pipe on the road between the start side shaft and the arrival side shaft that sandwich the existing pipe to be constructed in advance, Incurs prolonged work. In addition, there is a problem that traffic congestion occurs due to traffic restrictions associated with the installation of bypass piping. Due to such problems, the water changing work is often difficult particularly in urban areas. For this reason, there has been a strong demand for a method of rehabilitating existing pipes in an environment where running water exists without stopping running water or performing water change work.

  In response to such demands, a styrofoam plate is wound around the outer peripheral surface of the tube, and a thin steel plate is wound around the outer peripheral surface to be riveted, and a water stop plate is attached to both ends of the tube to increase the buoyancy of the tube. By securing, a means has been proposed that floats on running water and sequentially transports and connects the pipe body into the existing pipe (see, for example, Patent Document 1 below).

JP 2007-285317 A

  However, according to the invention described in Patent Document 1, when transporting a pipe body floating in running water due to buoyancy into an existing pipe, the balance between the front and rear of the pipe body is unstable due to collision of the running water against the water stop plate. Become. Further, in the invention described in Patent Document 1 in which the pipe body is floated and transported in the flowing water, when the flowing speed of the flowing water is relatively high, the flowing speed of the pipe body to be transported increases accordingly, and the pipe body is transported safely. The problem also becomes difficult.

  The present invention has been made in view of such problems, and a novel method for rehabilitating an existing pipe that can float the pipe body in a stable posture in the water flowing in the existing pipe and can be transported safely. The purpose is to provide.

  The existing pipe rehabilitation method of the present invention (hereinafter referred to as “the method of the present invention”) is a method of rehabilitating an existing pipe that connects a plurality of pipes in an existing pipe in which running water exists, and the pipe body is turned into running water. The cable body is floated, one end of the cable body is fixed to the tube body, and the cable body is fed out from the upstream side to transport and flow down while controlling the flow speed of the tube body, and sequentially connected at the transport destination.

  Hereinafter, the method of the present invention will be described in detail.

  In the method of the present invention, the bottom portion of the tubular body refers to the lower portion of the inner wall surface of the tubular body when the tubular body is disposed in a state of opening sideways.

  The method of the present invention is a method of rehabilitating an existing pipe by connecting a plurality of pipe bodies in an existing pipe where running water exists. That is, in order to rehabilitate existing pipes with running water, such as sewage channels, agricultural water channels, and electric power channels, a plurality of pipes are transported along the existing pipes in the presence of running water, and the pipes are sequentially moved at the transport destination. This is a method of rehabilitating existing pipes by connecting them.

  In the method of the present invention, the means for floating the pipe body against flowing water is not particularly limited. First, buoyancy is imparted to the pipe body by attaching water stop plates to both ends of the pipe body, respectively. Means can be mentioned.

  The water stop plate can be fixed to the front and rear ends of the tube, and the tube body is partitioned by both water stop plates, and the buoyancy that can float on the water flowing in the existing tube with respect to the tube body. The shape and material are not particularly limited as long as they are imparted. In the method of the present invention, a plate-like or hollow board-like member having an arc-shaped bottom that can be fitted in close contact with the lower part of the inner wall of the tubular body is preferably used. In addition, the method for fixing the water stop plate to the tube is not particularly limited as long as the water stop plate has a fixing strength such that the water stop plate cannot be easily removed during transportation work. For example, a bolt, a vise, or the like You may fix using. In the method of the present invention, a fixing means using a fixing jig such as a jack that supports the water stop plate on the inner wall of the pipe in a stretched manner with respect to the upper portion of the inner wall of the pipe is easily used.

  In the method of the present invention, “the (both) ends of the tube” means the vicinity of the (both) openings in front of and behind the inner wall of the tube. That is, not only the (both) opening ends before and after the tube body, but also a portion that slightly enters the tube body from the opening end is also included in the “(both) end portions of the tube body”.

  In addition, in the method of the present invention, instead of using a means for attaching a water stop plate to each end of the pipe body, or in combination with the means, a floating member is provided on the pipe body so that the pipe body is protected against running water. You may float.

  Examples of the floating member include a hollow floating bag formed of a material such as resin or metal, and polystyrene foam. The position where the floating member is attached to the pipe body is not particularly limited. However, when the running water existing in the existing pipe is almost full, it is preferable to attach the floating member to the upper portion of the pipe body. On the contrary, when there is a small amount of running water in the existing pipe, it is preferable to attach to the lower part of the pipe body.

  In the method of the present invention, one end of the cable body is fixed to the tube body, and the cable body is fed out from the upstream side, and is transported while controlling the flow speed of the tube body.

  Here, when the tube body is transported in a state of floating in flowing water, the balance between the front and rear of the tube body becomes unstable due to the load accompanying the collision of the flowing water with the water stop plate. In addition, when the flow rate of flowing water is relatively high, the flow rate of the pipe increases, which causes a problem that it is difficult to transport safely.

  In this regard, in the method of the present invention, the front-rear balance of the tube can be stabilized by fixing one end of the cable to the tube and feeding the cable from the upstream side. Further, by controlling the flow speed of the pipe body so as to be slower than the flow speed of the flowing water, the pipe body can be safely transported even when the flow speed of the flowing water is relatively large.

  The cable body fixed to the tube body is not particularly limited, and examples thereof include a rope, a wire, and a chain. Further, as a means for feeding out the cable body (means for causing the pipe body to flow down while applying a tensile force to the cable body), human power may be used, but in consideration of a stable driving force and safety, a winch, etc. It is preferable to use the winding means. Further, a plurality of the cords may be used.

  As described above, according to the method of the present invention, the tubular body is floated, one end of the cable body is fixed to the tubular body, and the cable body is fed out from the upstream side to carry it down while controlling the flow speed of the tubular body. Here, when the tube body is floated against running water, by attaching a water stop plate to both ends of the tube body, respectively, when adopting means for imparting buoyancy to the tube body, during transportation work, The flowing water that flows down faster than the pipe always collides with the water stop plate on the upstream side of the flowing down pipe. In some cases, a part of the flowing water that collides with the water stop plate passes over the water stop plate and flows into the pipe body.

  Inflow of a small amount of water moves the center of gravity of the tube downward, so that the tube can be transported in a more stable posture as long as a certain buoyancy is ensured. However, the inflow of a large amount of water significantly reduces the buoyancy of the tube, making it impossible to float the tube in flowing water.

  Therefore, in the method of the present invention, when means for imparting buoyancy to the tubular body is employed by attaching water stop plates to the both ends of the tubular body, respectively, the both ends of the tubular body are provided. It is preferable to provide a bypass pipe penetrating both water stop plates with respect to the water stop plate.

  That is, by providing such a bypass pipe, a part of the flowing water that collides with the water stop plate on the upstream side in the flowing water direction in the pipe body that flows down can flow out to the downstream side in the flowing water direction through the bypass pipe. . As a result, the water level difference between the upstream side and the downstream side in the flowing water direction in the flowing down pipe body can be prevented and the upstream water can be prevented from exceeding the water stop plate, and the water can be prevented from flowing into the pipe body. be able to. Moreover, the burden on the means which unwinds the said cable body is reduced by releasing the resistance by the flowing water which collides with a water stop plate with a bypass pipe.

  By the way, a pipe line in a normal existing pipe has a linearly extending portion and a curved or bent portion. Therefore, when the pipe body is transported down in the existing pipe, the pipe body may come into contact with the inner wall of the existing pipe, particularly at the curved or bent portion of the pipe line, and may be damaged.

  Therefore, in the method of the present invention, it is preferable to provide an impact buffering jig that prevents the pipe body from directly colliding with the existing pipe.

  The impact buffering jig is not particularly limited as long as it can relieve the impact when the pipe body comes into contact with the existing pipe inner wall. Specifically, a cushion, sponge, rubber, or polystyrene foam can be used. These shock buffering jigs may be provided at appropriate portions of the tube, particularly at the front end and the rear end of the tube.

  In particular, in the method of the present invention, an impact buffering jig is used which has a wheel which is attached to the pipe body such as a wheel, a caster or a roller and can roll on the inner surface of the existing pipe, and is installed during the transportation work. When the inner wall of the tube and the wheel come into contact with each other, it is preferable that an impact can be released by the rotation of the wheel. An impact buffering jig having this type of wheel can be provided at an appropriate position (especially, both pipe side portions) at the periphery of the opening of the tube by means of a detachable fastening means such as a bolt or a vise. Compared with a cushion, sponge, rubber, foamed polystyrene, or the like that needs to be wound or fastened, there is an advantage that the attaching operation becomes very easy.

  Also, according to the method of the present invention, if the existing pipe is straight, the direction in which the cable body is drawn out is parallel to the pipe, but the existing pipe has a curved portion or a bent portion. In such a case, there may be a case in which a wrinkle is generated in the direction in which the cable body is drawn out with respect to the pipe line, the pipe body is inclined, and a part of the pipe body (particularly both front and rear sides) is in contact with the existing pipe inner surface. In this case, if an impact buffering jig having the wheel is used, the wheel rotates while contacting the inner surface of the existing pipe, and can be smoothly transported without damaging the pipe body.

  Furthermore, in the method of the present invention, it is preferable to attach an auxiliary wheel capable of rolling the inner surface of the existing pipe to the lower part of the pipe body. If an auxiliary wheel is provided in the lower part of the pipe body, the impact when the lower part of the pipe body comes into contact with the inner wall of the existing pipe can be mitigated during the carrying work in the existing pipe. During the connecting operation, the tube body can be easily moved.

  In the method of the present invention, a plurality of pipes are transported down and connected at the transport destination to form a rehabilitation pipe.

  The means for connecting the pipe bodies is not particularly limited, and the pipe bodies may be connected using fastening means such as bolts and vices or appropriate connecting means. In the method of the present invention, in order to simplify the connection work, a tube having a structure in which a receiving port and an insertion port are formed at both front and rear ends is used, and the insertion port of another tube is used with respect to the receiving port of one tube. It is preferable to connect the tubular bodies by inserting the.

  Here, when connecting the pipes, it is necessary to perform height adjustment (level adjustment) between the pipes to be connected.

  Usually, the tubular body transported to the transport destination is fixed to a predetermined height by using a fixing means such as a floating prevention metal fitting. This fixing is performed in order to position the pipe body and to prevent the pipe body from rising due to running water or a backfill material described later. Generally, the tubular body fixed by the fixing means is often arranged at a position lower than the position floating in running water during transportation. Therefore, in most cases, the adjustment of the heights of the pipes to be connected is an operation of lowering the height of the succeeding pipe body that has been transported to the height of the already fixed pipe body.

  In the method of the present invention, in the case where means for imparting buoyancy to the tubular body is employed by attaching water stop plates to both ends of the tubular body, the tubular body is used for height adjustment of the tubular body. It is preferable to perform this by adjusting the buoyancy of the tubular body by supplying water into the area partitioned by both water stop plates.

  That is, by supplying water into the area of the pipe body that is partitioned by the water stop plates, and increasing the weight against the buoyancy that the pipe body receives, the pipe that has been transported is already fixed in height. It is lowered to the height of the body. As a result, the height of the tube can be adjusted by a relatively simple operation.

  In addition, you may perform the water supply to the area partitioned off by the both water stop plates in a pipe body by human work using containers, such as a bucket. However, in order to be able to supply water into the area more easily, in the method of the present invention, a water supply hole that penetrates the water stop plate is provided, and the water supply cock and the water faucet provided in the water supply hole are operated. It is preferable that water can be supplied through the water supply hole.

  Usually, when rehabilitating existing pipes, after a predetermined number of pipes are connected and rehabilitated pipes are constructed, drainage work is performed to drain running water existing in the gap between the existing pipes and pipes.

  In the method of the present invention, when performing the drainage operation, after a predetermined number of pipes are connected, the entire surface of the gap between the existing pipe and the pipe is closed at the upstream end of the flowing water among the connected pipes. By forming a partition wall, the water existing in the gap between the existing pipe and the pipe body is drained, and among the connected pipe bodies, at the downstream end of the flowing water, at least under the gap between the existing pipe and the pipe body It is preferable to form a partition wall that closes the half, and to pump up residual water that could not be drained by the drainage using a pumping means.

  That is, a partition wall that closes the entire gap between the existing pipe and the pipe body is provided at the upstream end of the flowing water of the predetermined number of pipe bodies (rehabilitation pipes that have reached a predetermined length by being connected). If formed, the inflow of water into the gap between the existing pipe and the pipe body is blocked, and the water existing in the gap is drained.

  About the remaining water that could not be drained, at least the lower half of the gap between the existing pipe and the pipe at the downstream end of the flowing water (up to a position that exceeds the water level of the remaining water) If the partition wall which closes up is formed, and it pumps up using pumping means, such as a pump, it will drain by a comparatively easy operation | work.

  The partition wall used in the method of the present invention is not particularly limited as long as it can close the gap between the existing pipe and the pipe body, and a plate material is used or a sandbag or a block is stacked. Or may be formed. In particular, in the method of the present invention, a bag material that expands into a predetermined shape by injecting a mortar such as a mortar bag that has excellent handleability, is easy to shape, and can build a good closed state is used as a partition wall. It is preferable.

  Further, when rehabilitating the existing pipe, a backfilling material filling operation is usually performed in which a gap between the existing pipe and the pipe body is filled with a backfilling material such as mortar. That is, by filling the gap between the existing pipe and the pipe body with a backfilling material such as mortar, the pipe body (rehabilitated pipe) is fixed to the existing pipe and the self-supporting strength is improved.

  In the method of the present invention, in performing the backfilling material filling operation, in order to improve the work efficiency, the backfilling material is placed in the gap between the existing pipe and the pipe body while pumping the remaining water using the pumping means. Filling is preferred.

  In preparing this backfill material, if the specific gravity of the backfill material exceeds 1.0, preferably 1.1 or more, the backfill material will push away residual water during the filling operation. Since it sinks in the residual water, it is possible to prevent the occurrence of defects such as voids in the filled back-filling material while the pumping operation proceeds.

  The specific gravity of the backfilling material can be adjusted by changing the selection of the raw materials constituting the backfilling material and the blending ratio. For example, the specific gravity of air mortar used as a general backfill material is about 0.8, but the specific gravity can be increased by blending an admixture.

  According to the method of the present invention, the tubular body is floated, one end of the cable body is fixed to the tubular body, and the cable body is gradually fed out from the upstream side to carry it down while controlling the flow speed of the tubular body. , The front-rear balance of the tube can be stabilized.

  Further, since the flow speed of the pipe body can be controlled, the pipe body can be safely transported even when the speed of water flowing down is relatively high.

FIG. 1 is a perspective view showing a tubular body with a water stop plate attached, with a part cut away. FIG. 2 is a side view (a) and a front view (b) showing the tubular body with a water stop plate and an impact buffering jig attached thereto. FIG. 3 is an explanatory diagram showing a state in which one embodiment of the present invention is implemented. FIG. 4 is a cross-sectional view showing a state in which a tubular body is fixed to an existing pipe. FIG. 5 is a side view (a) and a front view (b) showing the centering jig together with the tubular body. FIG. 6 is an explanatory view showing the joining procedure of the tubular body using the joining jig. FIG. 7 is a cross-sectional view showing a rehabilitation pipe constructed in an existing pipe. FIG. 8 is a cross-sectional view showing a state in which a partition wall is provided at the end of the rehabilitation pipe. FIG. 9 is an explanatory diagram showing the drainage operation and the mortar filling operation in one embodiment of the present invention over time in the order of (a) to (d). FIG. 10 is a cross-sectional view of a starting side shaft explaining a conventional method for rehabilitating existing pipes.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the embodiments.

  FIG. 1 is a view showing a tubular body 1 (with a water stop plate 2) used in carrying out the method of the present invention, with a part cut away.

  In the present embodiment, the tubular body 1 is a plastic composite tube having a laminated structure of glass fiber reinforced plastic (FRP) and resin mortar. One end of a straight tubular tube body 1c having a constant inner and outer diameter in the tube body 1 is provided with a short cylindrical receptacle 1a having a diameter larger than that of the tube body 1c. The other end of the portion 1c is formed with an insertion slot 1b having a tapered surface tapered toward the tip. The connection of the tube body 1 is performed by inserting the insertion port 1b of the tube body 1 following the receiving port 1a of the preceding tube body 1.

  A water blocking rubber (not shown) is provided on the inner peripheral surface of the receiving port 1a of the tube body 1 (or the outer peripheral surface of the insertion port 1b), and another tube body 1 is inserted into the receiving port 1a of the one tube body 1. When the port 1b is inserted and connected, the receiving port 1a and the insertion port 1b are connected in a watertight state via a water blocking rubber.

  And the water stop board 2 is provided in the bottom part of the front-and-back each edge part of the pipe main-body part 1c in the pipe body 1. As shown in FIG. The water stop plate 2 is formed of a hollow board having a constant thickness, and includes an arc portion having an outer diameter corresponding to the inner diameter of the tube main body portion 1c in the tube body 1 and a chord portion shorter than the diameter of the tube main body portion 1c. A shape (bow shape) is formed, and packing (not shown) is provided on the outer peripheral surface of the arc portion. Thereby, the outer peripheral surface of the water stop plate 2 and the inner peripheral surface of the tube main body 1c in the tube 1 can be joined in a watertight state.

  The water stop plate 2 is stretched and supported on the inner wall of the tubular body 1 via a substantially semicircular fixing jig 3 (connection band). More specifically, when the water stop plate 2 is attached to the tube body 1, the water stop plate 2 is first disposed at a predetermined position in the tube body 1, and the square member 4 is placed on the string portion of the water stop plate 2. On the other hand, a substantially semicircular fixing jig 3 formed by connecting both ends of the arc-shaped band 311 with the string-shaped band 312 is prepared.

  Reinforcing plates 313 are provided in the vicinity of both ends of the string-like band 312 in the fixing jig 3, and jacks 314 using bolt screwing are provided at the positions.

  And this fixing jig 3 is arrange | positioned above the square material 4 placed on the water stop board 2 arrange | positioned at the pipe body 1, and the jack 314 is operated. When the plate provided at the tip of the jack 314 is brought into contact with the square member 4, a pressing force corresponding to the advancement of the jack 314 is generated, so that the water stop plate 2 passes through the fixing jig 3 and the square member 4. 1 is supported in a thrust.

  In the present embodiment, a water supply hole 2a penetrating in the thickness direction is provided in the lower part of the central portion of the water stop plate 2. Further, a water supply cock 2b for operating the water supply hole 2a so as to be opened and closed is provided. Is provided. The water supply hole 2a is previously provided at a position where the water supply hole 2a is submerged corresponding to the depth of water that causes the pipe body 1 to float. Therefore, if the water supply hole 2a is opened by operating the water supply cock 2b, the flowing water can be supplied to the area partitioned by the inner wall surface of the tube 1 and the two water stop plates 2.

  Moreover, in this Embodiment, the bypass pipe 5 which penetrates the both water stop plates 2 each provided in the both ends of the said pipe body 1 is provided. The bypass pipe 5 has a length substantially corresponding to the length of the tubular body 1, and the axial center of the bypass pipe 5 extends through the insertion hole formed near the center of the water blocking plate 2. It is disposed at a substantially parallel position. The disposition position of the bypass pipe 5 with respect to the water stop plate 2 is set so that the bottom of the bypass pipe 5 is positioned in the vicinity of the draft line when the pipe body 1 is floated in running water.

  Further, in the present embodiment, as shown in FIG. 2, an impact buffering jig 6 made of a roller member has bolts at the positions of both tube side portions of the tube body 1 on the receiving port 1a side and the insertion port 1b side. Provided through. In addition, an auxiliary wheel 7 is provided via a vise at the positions of the lower portions of the pipes 1 on the receiving port 1a side and the insertion port 1b side. When the tube body 1 is floating in a stable state, the shock buffering jig 6 and the auxiliary wheel 7 are preferably separated from the existing tube S.

  A method for rehabilitating an existing pipe according to an embodiment of the present invention for rehabilitating an existing pipe S used in an agricultural waterway by using the pipe body 1 configured as described above will be described.

  As shown in FIG. 3, in this existing pipe S, water at a water level that can float the pipe body 1 flows in the direction indicated by the arrow in the figure over the construction section. In addition, when the water level of the running water is not sufficient to float the pipe body 1, the water level necessary for the construction section is taken by taking some means such as installing a weir on the downstream side of the construction section to stop the running water. What is necessary is just to secure.

  In the method for rehabilitating the existing pipe according to the present embodiment, first, the pipe body 1 is sequentially suspended from the start side shaft M1 provided on the upstream side of the running water so that the receiving port 1a faces the upstream side. In addition, it is preferable to attach the water stop plate 2, the impact buffering jig 6, and the auxiliary wheel 7 before the tube body 1 is suspended.

  The suspended tubular body 1 is formed by winding one or more (in this embodiment, two) nylon slings 8 around the receiving port 1a side of the tube main body 2 and a cord on the end of the wound nylon sling 8. A hook 92 provided at one end of the wire 91 is connected. On the other hand, the other end of the wire 91 is wound around the winch 9.

  The winch 9 is installed at a predetermined position of the existing pipe S. After the pipe body 1 is floated on running water, the wire 91 is gradually fed out by the winch 9 while controlling the flow speed of the pipe body 1 while the existing winch 9 is installed. The pipe S is conveyed toward the downstream side. At this time, the flow velocity of the flowing water (in this embodiment, about 1.0 m / s) is the flow velocity of the pipe body 1 that is conveyed while being subjected to speed control by tension (in this embodiment, about 0.5 m). / S), the flowing water collides with the upstream water stop plate 2 and tries to get over the water stop plate 2. In this embodiment, since the bypass pipe 5 penetrating the both water blocking plates 2 is provided in this embodiment, the colliding flowing water is allowed to pass through the bypass pipe 5 and flow out to the downstream side of the pipe body 1. it can. Thereby, the amount of water flowing over the water stop plate 2 and entering the pipe body 1 can be suppressed as much as possible.

  In addition, by flowing a part of the flowing water colliding with the water stop plate 2 through the bypass pipe 5, the resistance of the water flowing into the upstream water stop plate 2 is reduced. Thereby, the load applied to the winch 9 can be reduced. In particular, in this embodiment, since the flow speed of the tubular body 1 is controlled by carrying out the wire 91, the tubular body 1 can be safely transported regardless of the flowing water speed.

  When the first pipe body 1 reaches the start end of the construction section, the shock absorbing jig 6 and the auxiliary wheel 7 are removed from the pipe body 1. On the other hand, at the bottom of the existing pipe S having a substantially pentagonal hole shape, a support member 10 that supports both ends of the pipe body 1 is disposed. Next, by operating the water supply cock 2 b provided on the water stop plate 2 to open the water supply hole 2 a, the tube body 1 is placed on the support member 10 while the tube body 1 is submerged. Subsequently, a plurality of anti-floating materials 11 are disposed on the outer peripheral surface of the substantially upper half of the tubular body 1, and the tubular body 1 is supported and fixed at a position where the axial center substantially coincides with the axis of the existing pipe S ( 3 and 4).

  After the fixing work, the water stop plate 2 is removed from the pipe body 1 fixed in the existing pipe S. A centering jig 12 (giraffe jack) is attached to the emptied tube as shown in FIG.

  In this way, if the leading tubular body 1 is transported and supported and fixed to the start end of the construction section, the subsequent tubular body 1 is transported in the same manner, and its insertion port 1b is used as the receiving port 1a of the leading tubular body 1. And the succeeding tube 1 is connected to the first tube 1.

  At this time, the height (fixed position) of the preceding pipe body 1 that is supported and fixed to the existing pipe S is at a position lower than the height (floating position) of the subsequent pipe body 1 that is floating in flowing water. Therefore, in order to connect each tubular body 1, it is necessary to adjust the height (level adjustment) of each tubular body 1. This height adjustment is performed by supplying water into the pipe body 1 partitioned by the both water blocking plates 2 in the subsequent pipe body 1 and adjusting the buoyancy. This water supply can be easily performed by operating the water supply cock 2b provided on the water stop plate 2 to open the water supply hole 2a.

  When the height adjustment of each tubular body 1 is completed, the impact buffering jig 6 attached to the tubular body 1 is removed, and the succeeding tubular body 1 so as to approach the preceding tubular body 1 supported and fixed to the existing pipe S. Is moved so that the inner peripheral surface of the end portion 1b side end of the succeeding tube body 1 is opposed to the support caster 121 of the centering jig 12 installed in the preceding tube body 1. In this state, the jack 122 of the centering jig 12 is advanced, and the support caster 121 is raised through the hoisting arm 123, thereby lifting the end portion on the side of the insertion port 1b of the succeeding tubular body 1, and its axis is The height is finely adjusted so as to coincide with the axis of the preceding tube 1. At this point, the auxiliary wheel 7 attached to the succeeding tube body 1 is removed.

  Next, in the present embodiment, the connecting jig 13 is used to insert the insertion port 1b of the tube 1 that follows the receiving port 1a of the preceding tube 1. As shown in FIG. 6, the connecting jig 13 is configured by connecting a pair of joining plates 131 and 131 via a pair of lever hoists 132. Each joining plate 131 can be adjusted in length so that it can be engaged with the end surface of the tube main body 1c of the tube 1. The connecting jig 13 engages one joining plate 131 with the end face of the tube body 1c in the succeeding tube body 1 on the side of the receiving port 1a, and the other joining plate 131 in the tube body 1 in the preceding tube body 1. After being engaged with the end face of 1c on the side of the insertion opening 1b, the shackle 134 provided at the tip of the wire rope 133 of the lever hoist 132 is locked to each joining plate 131. Thereafter, by operating the lever hoist 132 and pulling the wire rope 133 on the succeeding tube body 1 side, the succeeding tube body 1 is forcibly pulled toward the preceding tube body 1, and the preceding tube body 1 The insertion port 1b of the tube body 1 following the receiving port 1a is inserted.

  If the succeeding tube body 1 is connected to the leading tube body 1, the succeeding tube body 1 is also supported and fixed using the support material 10 and the anti-floating material 11.

  In the same manner, when a plurality of pipes 1 are connected and supported and fixed to construct a rehabilitated pipe L (see FIG. 7), the outer periphery of the receiving end 1a side end of the upstream end pipe 1 A partition wall 14 that closes a gap between the existing pipe S and the pipe body 1 is formed on the surface (see FIGS. 8 and 9A). The partition wall 14 is composed of a mortar bag. After the bag is wound around the tube body 1, the bag is filled with the mortar to expand the bag into a predetermined shape, thereby closing the entire gap between the existing tube S and the tube body 1. To do. A plurality of injection pipes 15 of different lengths are inserted into the gap 141 above the partition wall 14 to inject air mortar as the backfill material M.

  Due to the blockage by the partition wall 14, water existing in the gap between the existing pipe S and the renovated pipe L on the downstream side of the partition wall 14 is discharged.

  Next, a partition wall 14 that closes at least the lower half of the gap between the existing pipe S and the pipe body 1 is formed at the end of the rehabilitation pipe L at the downstream end of the pipe body 1 of the pipe body 1 (FIG. 9B). )reference). The partition wall is formed of a mortar bag having the same shape as the partition wall 14 formed on the upstream side described above. After the bag is wound around the tubular body 1, the bag is filled with about half of the mortar.

  And in this Embodiment, the pump 16 is inserted from the open part of the upper part of the partition wall 14 formed in the downstream, and the residual water which stays in the clearance gap between the existing pipe S and the renovated pipe L is pumped up. In parallel with the pumping operation of the remaining water, the backfill material M is injected into the gap between the existing pipe S and the renovated pipe L. The backfill material M is injected while sequentially changing the plurality of injection pipes 15 from short to long (see FIGS. 9B and 9C).

  Since the specific gravity of the air mortar as the backfill material M is adjusted to 1.16, the residual water staying in the gap between the existing pipe S and the rehabilitated pipe L is caused by the backfill material M having a larger specific gravity than water. Extruded downstream. The extruded residual water is pumped up sequentially by the pump 16.

  After pumping up the remaining water, the drainage pump 16 is taken out, the inside of the mortar bag forming the downstream partition wall 14 is filled with mortar, and the entire gap between the existing pipe S and the pipe body 1 is closed. Note that an air venting / filling confirmation pipe 17 is inserted into the gap 141 in the upper part of the partition wall 14 on the downstream side (see FIG. 9D).

  If it is confirmed that the backfilling material M is filled and the backfilling material M is pushed out from the air evacuation and filling confirmation pipe 17, the backfilling material M is backfilled in the gap between the inner peripheral surface of the existing pipe S and the outer peripheral surface of the renovated pipe L. It is determined that the material M is filled.

DESCRIPTION OF SYMBOLS 1 Tube body 2 Water stop plate 3 Fixing jig 4 Square material 5 Pipe pipe 6 Impact buffer jig 7 Auxiliary wheel 8 Nylon sling 9 Winch 10 Support material 11 Lifting prevention material 12 Centering jig 13 Connection jig 14 Partition wall 15 Injection Pipe 16 Pump 17 Air venting and filling confirmation pipe L Rehabilitation pipe S Existing pipe M Backfilling material

Claims (11)

  A method of rehabilitating an existing pipe that connects a plurality of pipes in an existing pipe in which running water exists, the pipe is floated on running water, one end of the rope is fixed to the pipe, and the rope is fed out from the upstream side. A method for rehabilitating an existing pipe, wherein the pipe is transported while controlling the flow speed of the pipe body and is sequentially connected at the transport destination.   The method of rehabilitating an existing pipe according to claim 1, wherein the pipe body is floated on running water by providing water stop plates at both ends of the pipe body, respectively.   The existing pipe rehabilitation method according to claim 2, wherein the water stop plates respectively provided at both ends of the pipe body are provided with bypass pipes penetrating both water stop plates.   The existing pipe rehabilitation method according to any one of claims 1 to 3, wherein the pipe body is provided with an impact buffering jig for preventing the pipe body from directly colliding with the existing pipe. How to rehabilitate tubes. The existing pipe rehabilitation method according to claim 4, wherein the impact buffering jig has a wheel that is attached to the pipe body in a lateral direction and can roll on the inner surface of the existing pipe. The method for rehabilitating an existing pipe according to any one of claims 1 to 5, wherein an auxiliary wheel capable of rolling the inner surface of the existing pipe is attached to a lower portion of the pipe body.   The rehabilitation method for an existing pipe according to any one of claims 2 to 6, wherein the buoyancy of the pipe body is adjusted by supplying water into an area of the pipe body partitioned by both water blocking plates. Rehabilitation method for existing pipes that adjusts the height of pipes.   The existing pipe rehabilitation method according to claim 7, wherein the water supply is performed through a water supply hole provided in a water stop plate.   The existing pipe rehabilitation method according to any one of claims 1 to 8, wherein, after a predetermined number of pipes are connected, an existing pipe and a pipe are connected to an upstream end of flowing water among the connected pipes. By forming a partition wall that closes the entire gap with the body, water existing in the gap between the existing pipe and the pipe body is drained, and then at least the existing pipe at the downstream end of the flowing water among the connected pipe bodies A method for rehabilitating an existing pipe, in which a partition wall that closes the lower half of the gap between the pipe and the pipe body is formed, and residual water that has not been drained by the drainage is pumped using pumping means.   The rehabilitation method for an existing pipe according to claim 9, wherein a backfill material is filled in a gap between the existing pipe and the pipe body while pumping residual water using the pumping means.   The method for rehabilitating an existing pipe according to claim 10, wherein the specific gravity of the backfilling material is adjusted to exceed 1.0.

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