JP4776117B2 - Pipe connection repair method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for repairing a pipe connection portion where a manhole and a mounting pipe are connected, and more particularly to a seismic retrofit method for imparting earthquake resistance to a pipe connection portion of an existing manhole.
[0002]
[Prior art]
The sewer installation pipe is generally connected to a manhole provided at a ratio of about 30 m. FIG. 1 is a cross-sectional view of a conventional manhole structure.
[0003]
As shown in FIG. 1, in the manhole structure 51, the manhole 2 and the attachment pipe 3 are connected by drilling a hole having a diameter larger than the diameter of the attachment pipe 3 in the wall 2a of the manhole 2 at the factory or on site. The end portion of the mounting tube 3 is inserted into the drilling portion, and the gap between the outer peripheral surface of the insertion portion of the mounting tube 3 and the drilling portion of the manhole 2 is wound with concrete and fixed. The manhole structure 51 has an invert 4 in the existing manhole 2, buried soil 5 outside the manhole 2, and a paved road surface 6.
[0004]
[Problems to be solved by the invention]
However, the connecting pipe and manhole connected in this way move differently when an earthquake occurs, and if bending displacement or withdrawal displacement occurs between the mounting pipe and manhole, the mounting pipe and manhole are rigidly joined. Therefore, the wound concrete is cracked by ground vibration, and in some cases, it is destroyed, and the sewage flow function cannot be maintained.
[0005]
For this reason, in recent years, a newly installed manhole and mounting pipe are connected by a flexible joint made mainly of rubber, soft plastic or the like, and a method of giving earthquake resistance has been adopted.
[0006]
However, in existing manholes, the sand outside the existing manholes is excavated, the concrete at the joints between the manholes and the mounting pipes is removed, and the gaps between the mounting pipes and the manholes are filled with an elastic sealing material to give flexibility. Need to give earthquake resistance.
[0007]
In this way, rehabilitation of existing manhole mounting pipe connections requires excavation of earth and sand and removal of back-up concrete and backfilling of the rehabilitation part. In addition, since it cannot be backfilled until it is cured, there is a problem that the construction period becomes long, the cost is high, the restart of traffic is delayed, and traffic congestion is caused.
[0008]
An object of the present invention is to make it possible to repair a pipe connection portion of an existing manhole in a short period of time by using a flexible joint with respect to the problem of such a repair method.
[0009]
[Means for Solving the Problems]
The present invention, when refurbishing the pipe connection portion where the manhole and the attachment pipe are connected, removes the outer portion of the attachment pipe of the pipe connection portion from the inside of the manhole to form a manhole cutout portion, A water stop member is prepared, and the flexible water stop member has an R-shaped cross section roughly along the inner surface of the manhole cutout at one end, and a linear cross section at the other end. An outer cylindrical portion having a cylindrical rigid collar and a flexible joint inside the rigid collar, the flexible joint being fixed to the other linear shape portion of the rigid collar ; and the mounting tube An inner cylinder part on one R-shaped part side of the rigid collar fixed to the outer periphery of the collar, and a connecting part connecting the outer cylinder part and the inner cylinder part, and the flexibility Insert a water stop member into the manhole notch, and Was fixed to the outer periphery of the mounting tube, it relates to a new renewal method of the pipe connecting portion, characterized in that filling the filling material into the manhole notch portion of the outer periphery of at least the rigid collar.
[0010]
In order to give earthquake resistance to the pipe connection part of the existing manhole, the present inventor examined various repair methods for the pipe connection part.
[0011]
As a result, the present inventor is a rock drilling machine with the mounting pipe remaining around the mounting pipe of the existing manhole with respect to the pipe connecting portion in which the manhole and the mounting pipe are rigidly joined by a concrete hoisting or the like by a conventional method. It was found that it is no longer necessary to excavate or refill the soil outside the existing manhole by excising from the inside of the manhole using the above.
[0012]
Based on this knowledge, the present inventors examined in more detail, and the inventor cuts the manhole wall from the inside of the manhole, inserts a predetermined flexible water stop member into the space formed by excision, and fixes it. As a result, it was determined that the attachment pipe connecting portion of the existing manhole can be repaired to provide earthquake resistance, and the present invention has been achieved.
[0013]
In the present invention, the flexible water stop member includes a cylindrical rigid collar and a flexible joint inside the rigid collar. The flexible joint has an outer cylinder part fixed to the rigid collar, an inner cylinder part fixed to the outer periphery of the mounting pipe, and a connecting part connecting the outer cylinder part and the inner cylinder part. Yes.
[0014]
In the present invention, the outer portion of the mounting tube connecting portion from the inner side of the manhole is removed to form a manhole notch, a flexible water-stopping member is inserted into the manhole notch, and the inner tube portion of the flexible joint Is fixed to the outer periphery of the mounting tube exposed in the manhole notch, and at least the manhole notch on the outer periphery of the rigid collar is filled with a filler.
[0015]
In the method for repairing the mounting pipe connecting portion of the present invention, the outer tube portion of the flexible joint is fixed to the outer rigid collar in advance, so that the flexible tube can be stopped by simply fixing the inner tube portion to the outer periphery of the mounting tube. The water member can be fixed to the pipe connection portion.
[0016]
In the repair method of the present invention, the outer rigid collar receives the filler filled in the notch portion of the manhole, and the space between the rigid collar and the mounting pipe exhibits the flexibility of the flexible joint. The flexible joint gives earthquake resistance to the attachment pipe connection.
[0017]
According to the present invention, the pipe connection part of the existing manhole is partially removed, a predetermined flexible water-stopping member is inserted from the inside of the manhole, the inner cylinder part of the flexible joint is fixed to the mounting pipe, and the rigidity By filling the outer periphery of the collar with a filler, construction can be performed from the inside of the existing manhole, and the pipe connection portion can be repaired in a short period of time so as to exhibit excellent earthquake resistance.
[0018]
In addition, according to the present invention, the modified pipe connection portion is capable of absorbing the displacement even if bending displacement or withdrawal displacement occurs due to an earthquake or the like in the connected mounting pipe, and the pipe connection portion is destroyed. In addition, watertightness can be maintained.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described.
(1) Pipe connection part In this invention, the pipe connection part to which the manhole and the attachment pipe are connected is repaired so that earthquake resistance is fully exhibited.
[0020]
The existing pipe connection part concerning this invention is a part to which the manhole and the attachment pipe are connected. This pipe connection part includes the case where it is formed by various aspects. For example, the end of the mounting pipe is inserted into the drilling part of the manhole, and the outer peripheral surface of the insertion part of the mounting pipe is wound with a filler such as concrete in the gap in the drilling part of the manhole, and is connected and fixed to the manhole. It is a part etc.
[0021]
The manhole and attachment pipe used in the present invention may be a normal concrete manhole or attachment pipe, or may be a manhole or attachment pipe manufactured from various other materials.
[0022]
The pipe connecting portion renovation method according to the present invention is a method for newly providing sufficient earthquake resistance to a pipe connecting portion in which a manhole and a mounting pipe are rigidly joined by a concrete hoisting or the like by a conventional method.
[0023]
(2) Manhole cutout portion In the present invention, the outer portion of the attachment pipe of the pipe connecting portion is removed from the inside of the manhole to form a manhole cutout portion.
[0024]
Various methods can be used for excision of the existing pipe connection portion. In such excision, for example, a rock drill or the like can be used. Further, in such excision, the periphery of the attachment tube containing inverted concrete can be excised from the inside of the existing manhole while leaving the attachment tube.
[0025]
By cutting off the tube connecting portion, the mounting tube and the manhole wall are cut off, and a space between the mounting tube and the manhole, a manhole cutout portion, is formed.
[0026]
Such a manhole cutout has a size, shape, etc. into which the flexible water-stopping member according to the present invention can be inserted, and may have various sizes, shapes, etc., as long as workability such as installation is not hindered. it can.
[0027]
(3) Injection material In the present invention, preferably, the earth and sand outside the manhole is solidified prior to forming the manhole notch.
[0028]
With such a pipe connecting portion renovation method, it is possible to prevent earth and sand and groundwater around the manhole wall excision from flowing into the manhole during excision.
[0029]
In this construction method, various methods can be used. For example, prior to removing the outer part of the pipe connecting portion from the inner side of the manhole, an injection material that solidifies the earth and sand outside the manhole is injected from the inlet provided on the paved road surface, etc., and the manhole wall is excised. A method of solidifying the earth and sand around the part can be used.
[0030]
The injecting material is not particularly limited, and various materials that can solidify the earth and sand outside the manhole can be used.
[0031]
(4) Flexible waterproof member The flexible waterproof member according to the present invention includes a cylindrical rigid collar and a flexible joint inside the rigid collar. The flexible joint has an outer cylinder part fixed to the rigid collar, an inner cylinder part fixed to the outer periphery of the mounting pipe, and a connecting part connecting the outer cylinder part and the inner cylinder part. Yes.
[0032]
Such a flexible water-stopping member is inserted into the manhole cutout portion, the inner cylinder portion is fixed to the outer periphery of the attachment pipe, and the filler is filled into the manhole cutout portion at the outer periphery of the rigid collar and fixed.
[0033]
The flexible joint according to the present invention can be formed from various materials having elasticity. Such material can be selected from the group consisting of synthetic rubber such as styrene / butadiene / rubber, EPDM, chloroprene rubber, natural rubber, soft vinyl chloride resin, thermoplastic elastomer and the like.
[0034]
The rigid collar according to the present invention that requires rigidity and the clamp band used to fix the inner cylinder part of the flexible joint to the mounting pipe are made of stainless steel, rust-proof plated steel, hard plastic, fiber reinforced plastic, etc. Alternatively, they can be formed from composite materials, which are desirable because they are less susceptible to corrosion.
[0035]
(5) Backup material In this invention, Preferably, the backup material which keeps between these at a predetermined space | interval is installed between a rigid collar and an inner cylinder part.
[0036]
In such a pipe connecting portion renovation method, the filling amount and filling pressure of the filler according to the present invention can be easily adjusted, and workability is remarkably improved. Such a backup material prevents the filler from entering the space formed between the rigid collar and the inner cylindrical portion of the flexible joint, and can exhibit sufficient flexibility in the space where the flexible joint is applied. Like that.
[0037]
As such a backup material, various shapes and various materials such as polyethylene foam, urethane or rubber foam can be used.
[0038]
(6) Filler In the present invention, the filler is filled into at least the manhole cutout portion on the outer periphery of the rigid collar, and the flexible waterstop member is fixed to the manhole wall and the attachment pipe.
[0039]
Various fillers can be used. Examples of the filler include watertight mortar such as quick setting mortar and non-shrink mortar, and an aqueous epoxy bond.
[0040]
By filling the filler, the cutout portion of the manhole can be finished to the state before excision.
[0041]
(7) Amorphous Sealing Material In the present invention, preferably, prior to filling with the filler, an amorphous sealing material is placed on the outer peripheral surface of the rigid collar and the inner peripheral surface of the manhole notch.
[0042]
In such a pipe connecting portion renovation method, the waterproofness of the joint surface between the outer peripheral surface of the rigid collar or the inner peripheral surface of the manhole cut-out portion and the filler can be remarkably increased by the amorphous sealing material.
[0043]
As such an irregular sealing material, urethane caulking, silicon caulking, butyl rubber caulking, epoxy sealing material and the like can be used.
[0044]
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of an example of an existing manhole structure. FIG. 2 is a longitudinal sectional view showing one process according to the construction method of the present invention. FIG. 3 is a longitudinal sectional view showing another process according to the construction method of the present invention.
[0045]
FIG. 4A is a front view of one example of a flexible water-stopping member. FIG.4 (b) is the right view which has the partial cross section which looked at the flexible water stop member of (a) from the right side. FIG.4 (c) is a top view which has the partial cross section of the flexible water stop member of (a).
[0046]
FIG. 5A is a front view of an example flexible joint. FIG.5 (b) is a right view which has the partial cross section which looked at the flexible joint of (a) from the right side. FIG. 6A is a front view of one example of a rigid collar. FIG. 6B is a right side view of the rigid collar of FIG.
[0047]
FIG. 7A is a front view having a partial cross section of an example clamp band. FIG. 7B is a right side view having a partial cross section of the clamp band of FIG. FIG. 8A is a front view of an example expansion band. FIG. 8B is a right side view having a partial cross section of the expansion band of FIG.
[0048]
FIG. 9 is a longitudinal sectional view showing still another process according to an example of the method of the present invention. FIG. 10 is a longitudinal sectional view showing still another process according to an example of the method of the present invention. FIG. 11 is a longitudinal sectional view showing still another process according to the construction method of the present invention.
[0049]
FIG. 12A is a front view having a partial cross section of an example backup material. FIG. 12B is a right side view having a partial cross section of the backup material of FIG.
[0050]
FIG. 13 is a longitudinal sectional view showing a manhole structure obtained by an example of the method of the present invention. FIG. 14 is a cross-sectional view of the manhole structure of FIG. FIG. 15 is a longitudinal sectional view showing the earthquake resistance of an example manhole structure.
[0051]
Fig.16 (a) is a front view of the flexible water stop member of another example. FIG.16 (b) is the right view which has the partial cross section which looked at the flexible water stop member of (a) from the right side. FIG.16 (c) is a top view which has the partial cross section which looked at the flexible water stop member of (a) from the top.
[0052]
FIG. 17A is a front view of still another example of a flexible water-stopping member. FIG. 17B is a right side view having a partial cross section of the flexible water blocking member of FIG. FIG.17 (c) is a top view which has the partial cross section which looked at the flexible water stop member of (a) from the top. FIG. 18 is a longitudinal sectional view of a manhole structure obtained by another method of the present invention.
[0053]
In FIG. 1, in the existing manhole structure 51, the mounting tube 3 penetrates the wall 2a and is rigidly coupled to the manhole 2 with a mortar 7 'or the like. An invert 4 is formed on the bottom of the manhole 2 by placing concrete.
[0054]
In such an existing manhole structure, when the relative positional relationship between the manhole and the mounting pipe changes due to ground vibration or uneven settlement due to an earthquake, etc., the connection between the manhole and the mounting pipe is rigidly connected. Therefore, it is destroyed by cracks and has no earthquake resistance.
[0055]
In the present invention, the existing manhole structure is modified so that sufficient earthquake resistance can be exhibited.
[0056]
When repairing the attachment pipe connecting portion 7 of the existing manhole 51, in order to prevent earth and sand and groundwater around the excision portion of the manhole wall 2a from flowing into the manhole when the wall 2a is excised, FIG. It is preferable to inject the injection 9 around the excision part through the injection port 8 as shown in FIG.
[0057]
1, the manhole wall 2a and the invert concrete 4 around the mounting pipe 3 are cut using a rock drill 10 or the like, as shown in FIG. At this time, the attachment tube 3 is left in its original state, and a cut portion 11 is secured to such an extent that a flexible water stop member can be inserted.
[0058]
4A to 4C are a front view, a side view, and a plan view of an example of a flexible water-stopping member used in the present invention. The flexible water stop member 12 includes a flexible joint 13 and a rigid collar 14. The flexible joint 13 is fixed to the rigid collar 14 while maintaining watertightness.
[0059]
5A and 5B are a front view and a side view of the flexible joint 13 alone. The flexible joint 13 includes an inner tube portion 13a, an outer tube portion 13b, a connecting portion 13c that connects the inner tube portion 13a and the outer tube portion 13b. The inner cylinder part 13 a is connected to the attachment tube 2, and the outer cylinder part 13 b is connected to the rigid collar 14.
[0060]
FIGS. 6A and 6B are a front view and a side view of the rigid collar 14, and an R corresponding to the inner diameter of the existing manhole 2 is taken on one surface.
[0061]
The inner cylindrical portion 13a of the flexible joint 13 can be connected to the outer periphery of the mounting tube 3 by an example clamp band 15 as shown in FIGS. 7 (a) and 7 (b). The clamp band 15 has a fastening portion 15a. In FIG. 7, two clamp bands are shown.
[0062]
In the present invention, the fixing between the inner tube portion of the flexible joint and the mounting pipe is not limited to the one using the clamp band in FIG. 7, and the water tightness can be exhibited by tightening the inner tube portion of the flexible joint to the mounting tube. Any other format may be used.
[0063]
The outer tubular portion 13b of the flexible joint 13 can be connected to the rigid collar 14 by an example of an expansion band 16 as shown in FIGS. 8 (a) and 8 (b).
[0064]
As shown in FIG. 8, the extension band 16 has an extension portion 16 a having a function of expanding a cut portion of the band by expanding an extension leg provided on the bolt by tightening a nut.
[0065]
In the present invention, various types of bands and fixtures can be used for fixing the outer cylinder portion of the flexible joint and the rigid collar as long as watertightness can be exhibited without being limited by the form of the expansion band in FIG.
[0066]
FIG. 9 shows a state before the end 12 a of the flexible water blocking member 12 is attached to the attachment pipe 3 toward the inside of the manhole 2. At this stage, the inner peripheral surface of the cut portion 11 of the cut manhole wall 2a and the outer peripheral surface of the rigid collar 14 of the flexible water-stopping member 12 are not suitable for increasing the water-stopping property between the filler. It is better to place the fixed sealing materials 17 and 18.
[0067]
FIG. 10 shows a clamp band 15 provided on the outer periphery of the inner cylindrical portion 13a of the flexible joint 13 after the flexible water stop member 12 is inserted into the mounting pipe 3 to a predetermined position, and a fastener such as a driver or a ratchet wrench. Tighten at 19 to connect the mounting tube 3 and the flexible water stop member 12.
[0068]
FIG. 11 shows a state in which a gap between the flexible water-stopping member 12 and the cut portion 11 is filled with a filler 20 such as mortar having water tightness.
[0069]
At this time, a backup material 21 molded from polyethylene foam, urethane, or rubber foam is installed in the gap between the rigid collar 14 of the flexible water-stopping member 12 and the inner cylinder portion 13a of the flexible joint 13, and into the gap. It is better to adjust the filling of the filler 20.
[0070]
FIG. 12 shows a front view and a side view of an example backup material 21. The backup material 21 is an annular body and has a hollow portion 21a therein.
[0071]
In the present invention, the backup material is not limited to that shown in FIG. 12, and various members can be used as long as the space between the inner tube portion of the flexible joint and the rigid collar can be maintained at a predetermined distance.
[0072]
FIG. 13 shows a longitudinal cross-sectional view of a manhole structure in which the filler 20 is filled in the excision part 11 and the existing manhole is finished to the state before excision, and the repair method is completed. FIG. 14 is a cross-sectional view of the manhole structure of FIG.
[0073]
In the manhole structure 22, the periphery of the flexible water-stopping member 12 of the invert part and the existing manhole is finished with the filler 20 and exhibits sufficient earthquake resistance. In addition, in the manhole structure 22, although only the earthquake resistance process of the pipe connection part of one side is shown, both pipe connection parts are subjected to earthquake resistance process. Further, in the manhole structure 22, the intrusion of the filler 20 is recognized between the rigid collar of the flexible water-stopping member and the flexible joint, but the intrusion is slightly suppressed by the backup material 21. So there is no impact on earthquake resistance.
[0074]
As shown in FIG. 15, the manhole structure 22 modified by the construction method of the present invention causes a bending displacement in the mounting pipe 3 due to an earthquake or the like, and even if it is displaced by an angle θ as in the mounting pipe 3 ′, such a displacement does not occur. Since it is absorbed by the flexible joint, the pipe connecting portion 23 is not broken or pulled out, can maintain water tightness, and can be made earthquake resistant.
[0075]
In this invention, another flexible water stop member as shown to Fig.16 (a)-(c) can be used. The flexible water stop member 32 is configured to be folded back at the connecting portion 33c so that the inner cylindrical portion 33a and the outer cylindrical portion 33b of the flexible joint 33 face each other as in the case of FIG.
[0076]
The outer cylindrical portion 33 b of the flexible joint 33 is fixed to the outer side of the rigid collar 34 by a fastening band 36 while maintaining watertightness. The clamp band 35 and the like are the same as those in FIG.
[0077]
The fastening band 36 is provided in the vicinity of both ends of the cut portion of the band so that the flanges 37 face each other, and is fastened and fixed by a bolt 38 passed through the center portion of the flange.
[0078]
Moreover, in this invention, another flexible water stop member as shown to Fig.17 (a)-(c) can be used. The flexible water-stopping member 42 is the same as that shown in FIGS. 4 and 15, but in the flexible joint 43, the inner cylindrical portion 43a and the outer cylindrical portion 43b are opposite to each other with the connecting portion 43c as a boundary. The point which protrudes is different. The rigid cover 44, the clamp band 45, the extension band 46, and the like are the same as those in FIG.
[0079]
In the present invention, the manhole structure 47 having sufficient earthquake resistance as shown in FIG. 18 can be finished in the same manner as in FIGS.
[0080]
【The invention's effect】
As described above, in the construction method according to the present invention, the attachment pipe penetrates the wall of the manhole and is connected to the manhole, and the existing manhole in a state of being rigidly joined is repaired.
[0081]
The construction method of the present invention is to cut the invert concrete or manhole wall from inside the existing manhole with a rock drill etc. with the attachment pipe left, and attach a flexible water-stopping member from the inside of the manhole to ensure water tightness. The filling material such as mortar is filled up to the state before excision and finished.
[0082]
Such work can be carried out from within the manhole, and can be easily performed without requiring a large construction, and the existing pipe can be made earthquake resistant at a low cost in a short period of time.
[0083]
In addition, by retrofitting the rigidly connected manhole connection, even if the relative positional relationship between the manhole and the mounting pipe changes due to the earthquake after the repair, etc., the connection will be destroyed or sewage caused by the mounting pipe coming out This prevents the leakage of groundwater and the intrusion of groundwater and maintains the function of sewage flow, so that the attachment pipe connection part of the manhole is modified to a seismic connection part.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an example of an existing manhole structure.
FIG. 2 is a longitudinal sectional view showing one process according to an example of the method of the present invention.
FIG. 3 is a longitudinal sectional view showing another process according to an example of the method of the present invention.
FIG. 4A is a front view of one example of a flexible water-stopping member, and FIG. 4B is a right side having a partial cross section of the flexible water-stopping member of FIG. It is a top view, (c) is a top view which has a partial cross section of the flexible water stop member of (a).
5A is a front view of an example of a flexible joint, and FIG. 5B is a right side view having a partial cross section of the flexible joint of FIG.
6A is a front view of an example of a rigid collar, and FIG. 6B is a right side view of the rigid collar of FIG.
7A is a front view having a partial cross section of one example of a clamp band, and FIG. 7B is a right side having a partial cross section of the clamp band of FIG. FIG.
8A is a front view of an example expansion band, and FIG. 8B is a right side view of the expansion band of FIG.
FIG. 9 is a longitudinal sectional view showing still another process according to an example of the construction method of the present invention.
FIG. 10 is a longitudinal sectional view showing still another process according to an example of the construction method of the present invention.
FIG. 11 is a longitudinal sectional view showing still another process according to an example of the construction method of the present invention.
12A is a front view having a partial cross section of one example of the backup material, and FIG. 12B is a right side having a partial cross section of the backup material of FIG. FIG.
FIG. 13 is a longitudinal sectional view showing a manhole structure obtained by an example of the method of the present invention.
14 is a cross-sectional view of the manhole structure of FIG.
FIG. 15 is a longitudinal sectional view showing the earthquake resistance of an example manhole structure.
FIG. 16A is a front view of another example of a flexible water-stopping member, and FIG. 16B is a partial cross-sectional view of the flexible water-stopping member of FIG. It is a right view, (c) is a top view which has the partial cross section which looked at the flexible water stop member of (a) from the top.
FIG. 17A is a front view of another example of a flexible water-stopping member, and FIG. 17B is a partial cross-sectional view of the flexible water-stopping member of FIG. It is a right view, (c) is a top view which has the partial cross section which looked at the flexible water stop member of (a) from the top.
FIG. 18 is a longitudinal sectional view of a manhole structure obtained by another method of the present invention.
[Explanation of symbols]
2 Manhole 2a Wall 3, 3 'Mounting pipe 4 Invert 5 Buried soil 6 Pavement road surface 7 Mounting pipe connection part 8 Inlet 9 Injection agent 10 Rock drill 11 Cutting part 12, 32, 42 Flexible water stop member 13, 33 , 43 Flexible joints 14, 34, 44 Rigid collars 13a, 33a, 43a Inner cylinder parts 13b, 33b, 43b Outer cylinder parts 13c, 33c, 43c Connection parts 15, 35, 45 Clamp band 15a Tightening parts 16, 46 Expansion band 16a Expansion part 12a End parts 17, 18 Amorphous sealing material 19 Fastener 20 Filler 21 Backup material 21a Cavity part 22, 47 Manhole structure 23 Pipe connection part 36 Fastening band 37 Flange 38 Bolt 51 Existing manhole structure

Claims (4)

When refurbishing the pipe connection part where the manhole and the attachment pipe are connected, the outer part of the attachment pipe of the pipe connection part is removed from the inside of the manhole to form a manhole notch, and a flexible water-stopping member is provided. Prepared, the flexible water stop member has a cylindrical rigidity having an R-shaped cross section roughly along the inner surface of the manhole cutout at one end and a linear cross section at the other end A collar and a flexible joint inside the rigid collar, and the flexible joint is fixed to the outer cylinder part fixed to the other linear shape part of the rigid collar and to the outer periphery of the attachment pipe An inner cylinder part on one R-shaped part side of the rigid collar, and a connecting part connecting the outer cylinder part and the inner cylinder part, and the flexible water stop member Insert the manhole notch into the notch, and Fixed to the outer periphery of the tube, refurbishment method of the pipe connecting portion, characterized in that filling the filling material into the manhole notch portion of the outer periphery of at least the rigid collar. 2. The method of repairing a pipe connection part according to claim 1, wherein the earth and sand outside the pipe connection part is solidified prior to forming the manhole cutout part. 3. The pipe connection according to claim 1, wherein an amorphous sealing material is placed on an outer peripheral surface of the rigid collar and an inner peripheral surface of the manhole notch before filling the filler. Department of repair work. The pipe connecting portion refurbishing method according to any one of claims 1 to 3, wherein a backup material is provided between the rigid collar and the inner cylinder portion to keep a predetermined distance therebetween. .

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