JP2012241880A - Repairing method of conduit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize friction resistance in inserting a new pipe into a cushioning material disposed on the inner circumferential surface of a deteriorated existing conduit and prevent the new pipe from being sunk even after a long term use.SOLUTION: In the repairing method for repairing a conduit by disposing an elastic cushioning material 3 on the inner circumferential surface of an existing pipe 1 and further inserting a new pipe 5 thereto, an antifriction member which reduces the friction is inserted between the cushioning material 3 and the new pipe 5. The antifriction member is a rail 4 disposed in the longitudinal direction of the conduit, or an antifriction member 10 disposed on the outer circumference of a unit pipe 5a.

Description

  The present invention relates to a pipe line repairing method for arranging a buffer material inside a deteriorated existing pipe and repairing by inserting a new pipe into the buffer material.

  Many pipes are laid in the ground, including pipes for sewerage and waterworks. Since these pipe lines deteriorate over time, the deteriorated pipe lines are updated or repaired.

  An example of a pipe for sewage will be described for repairing an existing pipe. In the sewer pipes, manholes are installed at each required position, and a plurality of reinforced concrete pipes are laid between the manholes. In such a pipe line, the inner peripheral surface of the pipe may corrode and decrease in strength due to long-term use, and there is a possibility that the pipe may be broken by an applied load. In addition, due to an earthquake, ground subsidence, or the like, there may be a displacement including a dropout between the pipes or a crack may occur in the pipe, and there is a possibility that groundwater may enter from the displacement or the crack. And if groundwater enters the pipeline, there will be an excessive burden on the sewerage treatment facility, and earth and sand around the pipeline will enter with the groundwater, resulting in a decrease in the cross-sectional area of the pipeline and a void around it. This causes a problem that causes the road to collapse.

  When repairing a deteriorated existing pipe, a plurality of new pipes (new pipes) are continuously inserted into the existing pipe to form a new pipe line composed of new pipes between the manholes. There is a sheath pipe construction method in which cement milk is repaired by filling a gap formed between existing pipes. In this sheath pipe construction method, the repaired pipe line exhibits the strength obtained by adding the strength of the hardened cement and the new pipe to the strength of the existing pipe.

  In the case of the sheath pipe method, there is a problem that it is difficult to uniformly fill the gap between the new pipe and the existing pipe with cement milk, and in order to solve this problem, it is necessary to increase the size of the gap. . For this reason, there arises a problem that the inner diameter of the new pipe is considerably smaller than the inner diameter of the existing pipe. In addition, buoyancy acts on the new pipe due to the cement milk filled in the gap between the new pipe and the existing pipe, resulting in a problem that eccentricity occurs between the center of the new pipe and the center of the existing pipe.

  In order to solve the problem that the gap between the new pipe and the existing pipe in the above-mentioned sheath pipe construction method has to be large, a coating layer made of an elastic buffer material is provided on the inner peripheral surface of the existing pipe. After the formation, a coating method has been proposed in which a new tube is inserted inside the coating layer. In this covering method, the new pipe is inserted into the existing pipe by propelling while compressing the covering layer by the top body attached to the top of the new pipe. Then, after the head body reaches the manhole, the head body is removed to repair the new body.

  In the above-described coating method, when a new pipe is inserted, the coating layer is sufficiently compressed and thinned, and the gap between the new pipe and the existing pipe can be reduced. For this reason, the effect that the internal diameter of the repaired pipe line can be made large compared with the case where a sheath pipe construction method is employ | adopted is exhibited. In addition, since an elastic coating layer is interposed between the new pipe and the existing pipe, the relative displacement between the new pipe and the existing pipe can be absorbed.

  However, there is no problem even with the above-mentioned coating method, and after forming a coating layer with a buffer material on the inner peripheral surface of the existing pipe, a new pipe is inserted while compressing the coating layer. There is a problem that a large frictional resistance is generated between the new pipe and the buffer material. This problem becomes conspicuous as the diameter of the tube increases or as the insertion extension increases.

  Moreover, the coating layer which exists between a new pipe and an existing pipe is comprised with the buffer material which has elasticity, and is not solidified. For this reason, with a long-term use, the cushioning material at the bottom of the new pipe becomes thinner than the cushioning material at the top, and as a result, the new pipe sinks and the center of the new pipe and the existing pipe There arises a problem that an eccentricity occurs with the center. This problem occurs especially when repairing existing pipes with large diameters.

  It is an object of the present invention to reduce the frictional resistance when inserting a new pipe inside a cushioning material arranged on the inner peripheral surface of an existing pipe line, and the new pipe will sink even after long-term use. The purpose is to provide a repair method that prevents this from happening.

  In order to solve the above-described problems, the pipe repair method according to the present invention includes a shock absorbing material having elasticity placed on the inner peripheral surface of an existing pipe, and the pipe is repaired by inserting a new pipe into the shock absorbing material. An anti-friction member that reduces friction between the cushioning material and the new pipe between the cushioning material disposed on the inner peripheral surface of the existing pipe and the new pipe inserted into the cushioning material. It arrange | positions and the said new pipe | tube is inserted in the inside of the said buffer material, It is characterized by the above-mentioned.

  In the repair method described above, the anti-friction member is disposed in the buffer material disposed on the inner peripheral surface of the existing pipe and in the length direction of the pipe, or on the outer periphery of the new pipe and the new pipe. It is preferable to arrange in the length direction of the tube

  In any of the above repair methods, the anti-friction member is configured to support a new pipe inserted into the cushioning material and prevent the weight of the new pipe from directly acting on the cushioning material. Preferably it is.

  In the repair method according to the present invention, a friction reducing member that reduces friction between the buffer material and the new pipe is provided between the buffer material arranged on the inner peripheral surface of the existing pipe and the new pipe inserted into the buffer material. Since the new pipe is inserted into the cushioning material, the frictional resistance at the time of inserting the new pipe can be reduced.

  In the above repair method, when the anti-friction member is arranged in the cushioning material arranged on the inner peripheral surface of the existing pipe and in the length direction of the pipe line, it is in a state of reduced frictional resistance. A new tube can be inserted. That is, at the time of insertion, the new pipe does not need to be processed at all and can be easily operated.

  Further, in the above repair method, when the anti-friction member is disposed on the outer periphery of the new pipe and in the length direction of the new pipe, the cushioning material is disposed on the inner peripheral surface of the existing pipe. No work is required, and the application of the anti-friction member can all be performed on the ground or inside the manhole. For this reason, workability | operativity can be improved.

  In addition, when the anti-friction member is configured to support the new pipe inserted into the cushioning material and prevent the weight of the new pipe from directly acting on the cushioning material, it should be used for a long time. However, the inserted new pipe does not sink inside the existing pipe, and the center of the new pipe and the center of the existing pipe can be prevented from shifting.

  In the repair method according to the present invention, the buffer material is disposed on the inner peripheral surface of the existing pipe, and therefore the new pipe inserted into the buffer material is supported by the buffer material. For this reason, even when an existing pipe is displaced due to an earthquake or ground subsidence, this displacement can be absorbed by the buffer material, and the stress that may act on the new pipe should be minimized. Can do.

It is a figure explaining the repair construction method concerning the 1st example. It is a figure explaining the other example of the repair construction method concerning 1st Example. It is a partial enlarged view of the repair method according to the second embodiment. It is a figure which illustrates typically the relationship between an anti-friction member and a new pipe. It is a figure explaining the example of an antifriction member.

  The repair method according to the present invention will be described below. In the repair method according to the present invention, a coating layer made of a buffer material is formed on the inner peripheral surface of a deteriorated existing pipe (hereinafter referred to as “existing pipe”), and a new pipe (hereinafter “ It is repaired by constructing a "new pipe". In particular, when a new pipe is inserted into the coating layer, the anti-friction member that reduces the friction between the buffer material and the new pipe is arranged to facilitate the insertion of the new pipe.

  The diameter of the existing pipe to be repaired is not limited, and it applies to existing pipes with a small diameter that workers cannot enter to large diameter pipes that allow workers to enter and work. Is possible. In particular, from the viewpoint of workability when the buffer material is arranged on the inner peripheral surface of the existing pipe, it is advantageous to apply to an existing pipe having a diameter of about 800 mm to 2000 mm.

  In the present invention, the deterioration state of the existing pipe to be repaired is not questioned, and any deterioration state can be dealt with. In other words, the deterioration state of the existing pipe may include the occurrence of corrosion or cracks on the inner peripheral surface, or the displacement or step of pipes generated at the joint of the pipe. This includes cases where groundwater enters the inside and causes trouble. However, when there is a large gap between pipes or a large difference in level, pre-treatment is required prior to repairing, such as filling the offset or smoothing the difference.

  Further, “arranging the buffer material on the inner peripheral surface of the existing pipe” does not ask whether or not the buffer material is fixed to the inner peripheral surface of the existing pipe, and when the new pipe is inserted, What is necessary is just to arrange | position between the new pipe and the internal peripheral surface of an existing pipe. Therefore, prior to the insertion of the new pipe, the buffer material is fixed to the inner peripheral surface of the existing pipe, and the buffer material is simply passed through the existing pipe without being fixed to the inner peripheral surface of the existing pipe. There are only cases. In the present invention, in any case, when a new pipe is inserted into the buffer material, the buffer material is present between the inner peripheral surface of the existing pipe and the new pipe, and the inner peripheral surface of the existing pipe. It is assumed that a cushioning material is arranged in

  The cushioning material disposed on the inner peripheral surface of the existing pipe is not limited as long as it can exhibit an elastic cushioning performance. Examples of such a cushioning material include woven fabrics and nonwoven fabrics made of synthetic fibers, natural fibers, or inorganic fibers, and can be selectively employed from these. Further, the cushioning material is not limited to a woven fabric or a non-woven fabric, and it is also possible to employ a synthetic resin foam having elasticity.

  The shape of the buffer material is not particularly limited, and a sheet-like material or a sleeve-like material can be used. However, depending on whether a sheet-shaped cushioning material or a sleeve-shaped cushioning material is used, the construction method when placing on the inner peripheral surface of the existing pipe is different, so depending on the conditions including the diameter of the existing pipe to be repaired It is preferable to select appropriately.

  For example, when a sheet-like cushioning material is disposed on the inner peripheral surface of an existing pipe, it is necessary to place the cushioning material along the inner peripheral surface of the existing pipe and attach it by means such as adhesion or nail. Such an operation is performed when an operator enters an existing pipe, which is advantageous when an existing pipe having a large diameter is targeted.

  When the sleeve-like cushioning material is arranged on the inner peripheral surface of the existing pipe, a cushioning material sleeve having a diameter corresponding to the diameter of the existing pipe is previously folded flat, and this cushioning material is passed through the existing pipe. Then, it can be arranged on the inner peripheral surface of the existing pipe by supplying compressed air inside and inflating it. In addition, a sleeve-like cushioning material is passed through the existing pipe in a flatly folded state, and the new pipe is directly inserted into the cushioning material, and the inserted new pipe is propelled to remove the cushioning material. It is also possible to place it by pressing it against the inner peripheral surface.

  As described above, it is possible to select and employ various methods without limiting the construction method and the shape of the buffer material when the buffer material is arranged on the inner peripheral surface of the existing pipe. In particular, considering the ease of construction for existing pipes to be repaired, use a sheet-like cushioning material for large-diameter existing pipes, and use a sleeve-like cushioning material for small-diameter existing pipes. Is preferred. In any case, it is preferable to select and use an optimum cushioning material corresponding to the inner diameter of the existing pipe to be repaired in advance.

  Although the thickness of the cushioning material varies depending on the diameter of the existing pipe to be repaired and the state of deterioration, it is preferably about 10 mm to about 30 mm in a free state, and when the new pipe is inserted into this cushioning material, It is preferable to compress at a compression rate of about 30% to about 80%. However, the diameters of existing pipes and new pipes are determined according to standards including JIS standards, and the thickness assuming the compression ratio is set according to the diameter of the target existing pipe and the diameter of the new pipe that repairs this existing pipe. It is preferable to select a cushioning material having the same.

  For example, if there is unevenness in the pipeline to be repaired or there is a large level difference due to a gap between existing pipes, if the cushioning material is thinner than the above thickness, Insertion may be difficult. Also, if the buffer material is thicker than the above thickness, the gap between the existing pipe and the new pipe will be increased, resulting in a problem that the cross-sectional area of the pipeline after repair will be reduced, The problem arises that the propulsive force required when inserting a new tube also increases.

  When the cushioning material is made of fiber or foam, even if groundwater and earth and sand enter the cracks that occur in the existing pipes and the pipes are displaced, the buffering material is clogged by the earth and sand, and the groundwater that has entered It is preferable because it can prevent penetration to other sites.

  The material of the new pipe for repairing the existing pipe is not particularly limited, and a pipe used in the conventional sheath pipe construction method can be used. That is, pipes such as synthetic resin pipes, concrete pipes, iron pipes, FRP pipes, and FRPM pipes can be selectively used.

  The anti-friction member reduces the frictional resistance generated between the buffer material and the new pipe when the new pipe is inserted into the buffer material arranged on the inner peripheral surface of the existing pipe. For this reason, as long as the frictional resistance between the buffer material and the new pipe can be reduced, the material and shape can be used without limitation. In particular, the friction between the cushioning material and the new pipe occurs at the entire contact surface between them, so by providing a friction reducing member on the inner circumferential surface of the cushioning material or the outer circumferential surface of the new pipe or both, It is preferable to reduce friction.

  The anti-friction member is arranged between the shock absorbing material and the new pipe, and is a member that makes contact with both or one of them to reduce friction, or a part of the shock absorbing material is compressed and deformed. Therefore, it may be a member that blocks the contact of the buffer material to the new pipe, or a member that reduces the contact area. Such a member is made to correspond to the material of the buffer material or the material of the new pipe. Are preferably selected.

  As a material capable of reducing the friction between the buffer material and the new pipe, there is a material having a small friction coefficient such as a tetrafluoroethylene resin or a silicon resin. It can be used as an anti-friction member by sticking a sheet made of such a material to the inner surface of the buffer material arranged on the inner peripheral surface of the existing pipe, or by sticking it to the entire outer peripheral surface of the new pipe. It is. Although the thickness of such a sheet | seat is not specifically limited, From a viewpoint of making handling easy, it is preferable that it is about 0.2 mm-about 0.5 mm.

  In particular, when the antifriction member is disposed on the outer peripheral surface of the new pipe, a sheet made of tetrafluoroethylene resin or silicon resin may be simply wound. However, if the sheet is only wound, it may come off when inserted into the cushioning material. For this reason, it is possible to realize a reliable arrangement of the antifriction member by applying a surface treatment such as coating or lining with tetrafluoroethylene resin or silicon resin to the entire outer periphery of the new pipe.

  As described above, when a sheet-like anti-friction member is disposed on the inner peripheral surface of the buffer material or on the outer peripheral surface of the new pipe, the anti-friction member is connected to the outer peripheral surface of the new pipe or the inner peripheral surface of the buffer material. The contact is made substantially uniformly, and the friction generated when the new pipe is inserted can be reduced.

  In addition, when inserting a new pipe into the buffer material arranged on the inner peripheral surface of the existing pipe, if there is a deviation between the center position of the new pipe and the center of the existing pipe, The degree of compression of the cushioning material occurring in the above becomes uneven. For this reason, the reaction force of the buffer material against the new pipe becomes non-uniform, and as a result, the friction resistance generated over the entire outer periphery of the new pipe becomes non-uniform, so that the overall friction resistance increases. In particular, in a portion where the buffer material is compressed and thinned, it becomes easy to be affected by unevenness and unevenness of the existing pipe, and there is a possibility that a large resistance is generated. Therefore, there is a risk of hindering smooth insertion work.

  For this reason, when inserting a new pipe into the cushioning material, it is possible to average the frictional resistance generated by making the centers of the existing pipe and the new pipe substantially coincide with each other. Can be realized. For example, by providing a support member that supports the center position of the new pipe so that the center position of the new pipe substantially coincides with the center of the existing pipe, and by supporting the new pipe with the support member, the center of the existing pipe and the new pipe Can be substantially matched.

  As described above, the new pipe is supported by the support member provided inside the cushioning material, and the center position of the new pipe is made to substantially coincide with the center position of the existing pipe. The amount (thickness to be compressed) is substantially uniform over the entire circumference. For this reason, the frictional resistance that accompanies the insertion of the new pipe and the resistance required for compressive deformation of the cushioning material are substantially uniform over the entire circumference, and a smooth insertion operation can be realized.

  The support member is in contact with a part of the new tube and supports the weight of the new tube. This support member has sufficiently high rigidity and strength. For this reason, it becomes possible to reduce the weight which a buffering material bears, and as a result, it is possible to reduce the frictional resistance which arises with insertion of a new pipe.

  In particular, the support member made of a material having a small coefficient of friction with the new pipe can reduce the frictional resistance when inserting the new pipe, and this support member can be used as a friction reducing member. . Further, the support member needs to be a material harder than the buffer material. Thus, by using the support member made of a material harder than the buffer material, the weight of the new pipe does not directly act on the buffer material. For this reason, when inserting a new pipe | tube, it becomes possible to reduce the contact friction of this new pipe | tube and a buffer material.

  The anti-friction member having the support function as described above includes an angle member, a channel member, a shape member made of steel or stainless steel including a rail, a rod-like member such as a round bar or a square bar, and a contact portion with a new pipe. There are steel profiles and rod-shaped members that have been surface-treated, such as coating or lining with chlorinated ethylene resin and silicon resin, as well as synthetic resin profiles that have a low friction coefficient, including nylon. It is possible to employ selectively.

  When the above-described shape member or rod-like member is used as the anti-friction member, it is preferable that these are elongated. When such an anti-friction member is disposed on the upper side of the inner peripheral surface of the cushioning material disposed on the inner peripheral surface of the existing pipe, it is fixed to the inner peripheral surface in advance in order to prevent the anti-friction member from falling. It is necessary to keep. However, in the case of a heavy profile or rod-like member, fixing the upper side of the inner peripheral surface of the cushioning material takes time and effort, so the existing pipe is only inside the cushioning material and only on the lower side. It may be arranged over the entire length. And, when inserting a new pipe, by placing and propelling the new pipe to be inserted into a pre-arranged shape member or rod-shaped member, the frictional resistance between the buffer material and the new pipe is reduced. Is possible.

  As described above, when the anti-friction member made of a shape member or a rod-like member is disposed inside the shock absorbing material and on the lower side, the shock absorbing material is deformed by these friction reducing members and inserted with the shock absorbing material. A gap is formed between the outer periphery of the new pipe. That is, the cushioning material and the outer peripheral surface of the new pipe are not in contact with each other, and the frictional resistance generated when the new pipe is inserted can be reduced.

  As described above, when a support member that also serves as an anti-friction member is used, this support member is left in the repaired pipeline after the new pipe is inserted. For this reason, it is preferable that the support member has a higher strength against compression force than the buffer material (harder than the buffer material). By using such a support member, it is possible to prevent the buffer material from being deformed over time. Even if the repaired pipeline is used for a long period of time, the buffer material below is compressed. There is no risk that the thickness will be reduced. Therefore, even when used for a long period of time, it is possible to keep the center of the new pipe and the existing pipe in a substantially coincident state.

  Further, it is possible to make the center of the new pipe substantially coincide with the center of the existing pipe without arranging a long support member inside the cushioning material arranged on the inner peripheral surface of the existing pipe. That is, by attaching an anti-friction member having a thickness or height corresponding to the thickness of the buffer material to the outer peripheral surface of the new tube, when the new tube is inserted into the buffer material, It is possible to make the center of the pipe approximately coincide with the center of the existing pipe.

  As the shape of the anti-friction member as described above, there are a ring-shaped member fitted on the outer periphery of the new pipe, a sled member having a plurality of sliding surfaces, and the like. In addition, examples of the material of the antifriction member having these shapes include synthetic resins including polyethylene and nylon. Therefore, it is possible to manufacture the anti-friction member by forming it into a ring shape or a warp shape from the above-mentioned materials.

  Then, by firmly integrating the molded body having the shape and material as described above to the outer peripheral surface of the new tube, it is possible to reduce the frictional resistance when inserting the new tube into the buffer material. . In a pipe line repaired using a new pipe integrated with this molded body, the molded body has a higher strength against compressive force than a cushioning material, so that it does not easily deform over time and is used for a long time. Even so, there is no possibility that the lower cushioning material is compressed and the thickness is reduced. Therefore, even when used for a long period of time, it is possible to keep the center of the new pipe and the existing pipe in a substantially coincident state.

  In this way, even when the molded body is attached to the outer periphery of the new pipe and the center of the new pipe is made to substantially coincide with the center of the existing pipe, the amount of deformation of the cushioning material caused by the insertion of the new pipe is substantially reduced over the entire circumference. It becomes possible to make it uniform. For this reason, the frictional resistance that accompanies the insertion of the new pipe and the resistance required for compressive deformation of the cushioning material are substantially uniform over the entire circumference, and a smooth insertion operation can be realized.

  Furthermore, a new pipe with a sheet-shaped antifriction member wound around the outer peripheral surface is supported by a rod-shaped support member and inserted into the buffer material, or a buffer with a sheet-shaped antifriction member wound around the inner peripheral surface. It is possible to further reduce the frictional resistance by inserting a new pipe with an antifriction member attached to the outer peripheral surface inside the material. That is, the above-described sheet-like anti-friction member and support member, or the sheet-like anti-friction member and the anti-friction member attached to the outer peripheral surface of the new pipe can be used in combination.

  When inserting a new pipe inside the cushioning material, it is good to push it from the rear of the new pipe and propel it, but attach a head to the new pipe arranged at the head and connect a wire to this head It may be promoted by pulling.

  When thrust is applied to the rear of the new pipe and inserted into the cushioning material, the connection between the unit pipes that make up the new pipe does not necessarily have to be strong, but a joint that is used in a normal propulsion method is used. Alternatively, it is only necessary to ensure water tightness at the connection portion using a socket. However, when a new pipe is promoted by connecting a wire to the top body and pulling it, the multiple unit pipes that make up the new pipe need to be firmly connected, and it is necessary to consider joining via screws. There is.

  Next, the repair method according to the first embodiment will be described with reference to FIG. The existing pipe 1 to be repaired shown in the figure is a sewer pipe, and a plurality of fume pipes are continuously laid between the manhole 2 and the other manhole (not shown). A buffer material 3 is arranged on the inner peripheral surface of the existing pipe 1.

  The buffer material 3 is formed in a sleeve shape in which a non-woven fabric (felt) made of polyester fiber is made to correspond to the inner diameter of the existing pipe 1. After this sleeve is inserted from the manhole 2 to the other manhole adjacent to the retractable or reversing type, it is pressed against the inner peripheral surface of the existing pipe 1 by supplying compressed air and inflated, and this pressure contact state is maintained. ing. In this state, the buffer material is kept in a free state, and the thickness is substantially the same as the thickness of the material (for example, 30 mm).

  As described above, when the cushioning material 3 is formed in a sheet shape, an operator enters the inside of the existing pipe 1 and adheres the cushioning material 3 to the inner peripheral surface of the existing pipe 1 or bonds or nails. Paste it with etc.

  A pair of rails 4 serving as anti-friction members are provided in the buffer material 3 disposed on the inner peripheral surface of the existing pipe 1 and are directed downward from one manhole 2 to the other manhole. It is arranged over the entire length. The rail 4 is configured as an angle-shaped member made of stainless steel or hard synthetic resin, and when the new pipe 5 (unit pipe 5a) is placed, the center of the existing pipe 1 and the center of the new pipe 5 are substantially the same. The dimensions are such that they can be matched.

  The rail 4 arranged as described above serves as a friction reducing member that reduces the frictional resistance by supporting the load while slidingly contacting the unit tube 5a when the unit tube 5a is inserted into the cushioning material 3. In addition to exhibiting the above function, it also has a function as a guide member for guiding the propulsion direction.

  The rail 4 is preferably made of a material having a low frictional resistance. However, when strength problems occur, the rail 4 is configured with priority given to strength, and at least the surface in contact with the unit tube 5a is subjected to surface treatment with tetrafluoroethylene resin or silicon resin. preferable.

  In the present embodiment, the manhole 2 is provided with a jack 7 for propelling the unit pipe 5a. The jack 7 includes a bed 7a for placing the unit tube 5a to guide the propulsion direction, a pusher wheel 7b for propelling the unit tube 5a placed on the bed 7a, and a drive cylinder 7c for reciprocatingly driving the pusher wheel 7b. It is configured. And the jack 7 is installed in the bottom board 2a of the manhole 2, and is comprised so that the reaction force generated at the time of the propulsion of the unit pipe 5a can be supported.

  When propelling the unit pipe 5a into the buffer material 3, a leading body 8 having an outer diameter set slightly larger than the unit pipe 5a is attached to the tip of the leading unit new pipe 5a. The head body 8 has a function of expanding the diameter by pressing the buffer material 3 against the inner peripheral surface of the existing pipe 1 when the unit new pipe 5 a is propelled by the jack 7.

  Next, the procedure of the repair method according to the first embodiment will be described. First, the head unit pipe 5a is placed on the jack 7 installed in the manhole 2, and the head body 8 is attached to the unit pipe 5a. Next, the drive cylinder 7c of the jack 7 is driven to advance the push wheel 7b, thereby propelling the unit tube 5a. Along with this propulsion, the leading body 8 presses the buffer material 3 against the inner peripheral surface of the existing pipe 1 to reduce the thickness.

  The propelled unit pipe 5a moves from the bed 7a of the jack 7 to the rail 4 and is propelled while being placed on the rail 4. For this reason, a part of the weight of the unit pipe 5 a is supported by the rail 4, and the whole weight of the unit pipe 5 a does not directly act on the buffer material 3. Therefore, the load acting on the contact portion between the unit tube 5a and the buffer material 3 is reduced, and the frictional resistance generated with the propulsion is reduced. When the propulsion of one unit pipe 5a is completed, the pusher wheel 7b is returned to its original position, and then a new unit pipe 5a is placed on the bed 7a and continuously propelled to the already propelled unit pipe 5a. .

  As described above, the plurality of unit tubes 5a are continuously propelled, and when the head body 8 arrives at an adjacent manhole, the head body 8 is detached so that it is laid between the manhole 2 and the other manhole. The existing pipe 1 can be repaired with the new pipe 5.

  In particular, since the new pipe 5 holds the mounting state with respect to the rail 4, even if it is used for a long period of time in the future, all the loads from the new pipe 5 including the weight of the sewage flowing through the inside are antifriction members. Therefore, the thickness of the buffer material 3 does not fluctuate. Accordingly, it is possible to maintain a state in which the center of the existing pipe 1 and the center of the new pipe 5 are substantially matched.

  In addition, as shown in FIG. 2, a rod-shaped member having a square cross section may be used as the anti-friction member 4 in place of the rail made of the aforementioned angle-shaped member. In this case, the buffer material 3 is arranged on the inner peripheral surface of the existing pipe 1, and a plurality of (two in the figure) anti-friction members 4 are arranged inside the buffer material 3. The new pipe 5 in which the unit pipe 5a is connected to 4 can be promoted.

  As shown in the figure, when the new pipe 5 is placed on the plurality of anti-friction members 4, the weight of the new pipe 5 is transmitted from the anti-friction member 4 to the existing pipe 1 through the buffer material 3. For this reason, although the large deformation | transformation according to the transmitted weight arises in the shock absorbing material 3 which is contacting the antifriction member 4, a big deformation does not arise in the shock absorbing material 3 between the antifriction members 4, It deform | transforms so that it may space apart from the outer peripheral surface of the new pipe 4, or may contact slightly. That is, the buffer material 3 around the antifriction member 4 has a portion that is not in contact with the new tube 5. For this reason, it is possible to reduce the frictional resistance generated when the new pipe 5 is propelled.

  As described above, since a part of the weight of the new pipe 5 is transmitted to and supported by the existing pipe 1 through the anti-friction member 4, the total weight of the new pipe 5 directly acts on a part of the buffer material 3. Even if it is used for a long time, it will not be deformed by an eccentric load. Accordingly, it is possible to maintain a state in which the center of the existing pipe 1 and the center of the new pipe 5 are substantially matched.

  Next, the repair method according to the second embodiment will be described with reference to FIGS. In the present embodiment, the antifriction member 10 is mounted on the outer periphery of the unit pipe 5a and inserted into the cushioning material 3, thereby reducing the frictional resistance generated during propulsion and the center of the new pipe 5 at the center of the existing pipe 1. The state of being substantially coincident with the center can be maintained.

  That is, as shown in FIG. 4, the antifriction member 10 configured by connecting a plurality of jigs 11 in a ring shape is mounted in a headband shape near the front and rear ends of the outer periphery of the unit tube 5a. ing. The frictional resistance generated when the unit tube 5 a is inserted into the buffer material 3 can be reduced by the antifriction member 10.

  The jig 11 is configured as a molded article made of a synthetic resin that has a small frictional resistance and can exhibit high strength. As shown in FIG. 5, the jig 11 is formed on a curved portion 11a formed in a curved shape, connection portions 11b formed at both ends in the longitudinal direction of the curved portion 11a, and one side of the connection portion 11b. And a connection hole 11d formed on the other side of the connection portion 11b.

  In particular, when a force is applied to the top of the bending portion 11a, the bending portion 11a is deformed so as to be crushed according to the applied force and absorbs the force. Therefore, the bending shape of the bending portion 11a affects the strength of the antifriction member 10. Will give. Further, the repair conditions including the thickness of the cushioning material 3 after the new pipe 5 is inserted vary according to the diameter of the existing pipe 1. Therefore, the bending shape and dimensions of the bending portion 11a are not uniquely set, and are appropriately set according to repair conditions such as the diameter of the existing pipe 1 and the diameter of the new pipe 5.

  In the present embodiment, the bending portion 11a is configured to have two bending members, but is not limited to this shape, and the bending portion 11a is configured by one or three or more bending members. You may do it. Such a shape is also appropriately set in accordance with the repair condition described above.

  A plurality of jigs 11 configured as described above are selected corresponding to the length of the outer circumference of the target unit tube 5a, and each band 11c is inserted through the hole 11d of the adjacent jig 11 to be connected. However, it can be mounted by winding it around the outer circumference of the unit tube 5a. When the anti-friction member 10 is configured by connecting a plurality of jigs 11, the bending portion 11a constituting the jig 11 maintains a free bending state.

  Next, the procedure of the repair method according to the second embodiment will be described. First, the necessary number of unit pipes 5a for repairing the existing pipe 1 are prepared, and the antifriction member 10 is attached to the outer periphery of each unit pipe 5a.

  Next, as in the first embodiment, a head body 8 having an outer diameter larger than the outer diameter of the unit pipe 5a and smaller than the inner diameter of the existing pipe 1 is attached to the tip of the head unit pipe 5a. . And it pushes toward the other manhole from one manhole. With this propulsion, as shown in FIG. 3, the head body 8 presses and compresses the cushioning material 3 toward the inner peripheral surface of the existing pipe 1.

  In the anti-friction member 10 mounted on the outer periphery of the unit tube 5a, the curved portions 11a of the individual jigs 11 act like scissors. That is, since the curved portion 11a is made of a material having a small frictional resistance, the contact friction with the buffer material 3 is reduced, and the frictional resistance accompanying the propulsion of the unit tube 5a can be reduced.

  Moreover, since the curved part 11a of the jig 11 presses the buffer material 3 toward the inner peripheral surface of the existing pipe 1, the buffer material 3 is prevented from coming into contact with the outer periphery of the unit tube 5a. It is possible to substantially ignore the frictional resistance generated in Accordingly, when the unit pipe 5a is propelled inside the buffer material 3, frictional resistance is generated between the buffer material 3 and the jig 11, and as a result, the frictional resistance can be reduced.

  A plurality of unit pipes 5a are continuously promoted, and after the head body 8 reaches the other manhole, the head body 8 is detached, so that the existing pipe 1 laid between adjacent manholes is repaired by the new pipe 5. Is possible. The new pipe 5 in which the existing pipe 1 is repaired in this way is supported by the antifriction member 10 on which the unit pipe 5a constituting the new pipe 5 is mounted on the outer periphery. For this reason, the load acting on the new pipe 5 is supported by the anti-friction member 10, and even if it is used for a long period of time, a part of the cushioning material 3 (below the new pipe) becomes thinner than the other parts. Therefore, it is possible to hold the center of the new pipe 5 and the center of the existing pipe 1 in a substantially matched state.

  The repair method according to the present invention can be used not only for existing pipes for sewers but also for existing pipes that are laid in the ground and in which groundwater may invade when deteriorated.

DESCRIPTION OF SYMBOLS 1 Existing pipe 2 Manhole 2a Bottom board 3 Buffer material 4 Rail 5 New pipe 5a Unit pipe 7 Jack 7a Bed 7b Push ring 7c Drive cylinder 8 Lead body 10 Anti-friction member 11 Jig 11a Bending part 11b Connection part 11c Connection band 11d Connection hole

Claims (4)

It is a repair method of repairing a pipe line by placing a buffer material having elasticity on the inner peripheral surface of an existing pipe and inserting a new pipe into the buffer material,
An anti-friction member that reduces friction between the buffer material and the new pipe is disposed between the buffer material arranged on the inner peripheral surface of the existing pipe and the new pipe inserted into the buffer material, and the new pipe Is inserted into the cushioning material.   The repair method according to claim 1, wherein the anti-friction member is disposed in a buffer material disposed on an inner peripheral surface of an existing pipe and in a length direction of the pipe.   The repair method according to claim 1, wherein the anti-friction member is disposed on an outer periphery of the new pipe and in a length direction of the new pipe.   2. The anti-friction member is configured to support a new pipe inserted into the cushioning material and prevent the weight of the new pipe from directly acting on the cushioning material. Repair method described in any of 3 above.

Images