JP2016053262A - Earthquake strengthening pipe and in-pipe earthquake strengthening method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a feed/drain pipe which is made of a clay pipe or a Hume pipe and which is excellent in earthquake resistance.SOLUTION: In an earthquake strengthening pipe, an earthquake resistant layer is installed on the entire perimeter of the inside of a feed/drain pipe made of a clay pipe including a manhole or a Hume pipe. A quick-drying resin with elasticity is overlaid by spraying on the entire perimeter of an in-pipe inner peripheral surface in a predetermined range in a cylindrical direction, and separation prevention means is configured at an end.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a seismic reinforcement pipe for a water supply / drain pipe including a manhole and a seismic reinforcement method in the pipe using the seismic reinforcement pipe.

  Conventionally, a seismic reinforcement method in a pipe including a manhole has been proposed and practiced (see, for example, Patent Documents 1 to 3).

  As one proposal, Patent Document 1 discloses a seismic sleeve for a pipe connected to a manhole.

  That is, as shown in FIG. 3, in the seismic sleeve of the pipe 1 connected to the manhole 2, the outer periphery of the tubular joint rubber 3 provided with a flange 4 for attachment to the inner wall of the manhole is bonded to one end. It is a seismic sleeve for pipes connected to a manhole in which the attachment rod is fixed to the inner wall of the manhole, and is bonded to the inner surface of the pipe 1 connected to the manhole via an agent.

  Further, in Patent Document 2, in a seismic sleeve for a pipe provided with a tubular joint attached to the inner surface of a pipe connected to a manhole, the outer diameter both end sides of the enlarged diameter part formed on the inner peripheral surface of the pipe are disclosed. A rubber cylinder having a ring-shaped seal material is accommodated in the rubber cylinder, a belt-shaped iron plate wound in a cylindrical shape is disposed on the inner periphery of the rubber cylinder, and a thermosetting resin is wound around the inner peripheral surface of the rubber cylinder. An earthquake-resistant sleeve for a pipe connected to a manhole is disclosed in which a thermosetting resin is pressure-cured and the inner peripheral surface of the resin layer formed thereby is made to coincide with the inner peripheral surface of the pipe. . With such a configuration, it is possible to provide a seismic sleeve for pipes that allows a smooth flow of drainage flowing through the pipe and that can be installed in a watertight manner and can withstand long-term use.

  Further, Patent Document 3 discloses an in-tube damaged portion sealing band for repairing a damaged portion in a tube and an in-tube damaged portion sealing method using the same. That is, in a pipe damaged part sealing band for partially repairing a damaged part in the pipe, the both ends in the circumferential direction have a wedge-shaped gap and are laid over the entire inner peripheral surface of the pipe. And a band in which sealing packing having elasticity is laid on both ends in the cylindrical direction, and a gap formed in a wedge shape at both ends in the circumferential direction of the band and filling the band on the inner peripheral surface of the pipe The band and / or the driving wedge is provided with a hole for encapsulating a sealing agent after laying.

  In other words, the band and / or the driving wedge is formed using a driving wedge configured to fill a gap formed in a wedge shape at both ends in the circumferential direction of the band and to bring the band into close contact with the inner peripheral surface of the pipe. By encapsulating the sealing agent in the hole, the damaged portion in the tube is efficiently repaired within the sealed range. A band is used so as to efficiently contain the sealant in the cylindrical direction.

JP 2000-336681 A (see FIG. 3) JP 2004-183342 A JP 2014-58995 A

  However, according to such prior art, after inserting one end of the earthquake-resistant sleeve into the inner surface of the pipe connected to the existing manhole, the other end is fixed to the manhole, or the inner circumference of the pipe. A thermosetting resin 7 is wound around the surface, the thermosetting resin is pressure-cured, and the inner peripheral surface of the resin layer formed thereby is connected to a manhole that matches the inner peripheral surface of the tube. A seismic sleeve for pipes that is difficult to adhere to the inner surface of the pipe, and that is resistant to damage to water supply and drainage pipes, including joints between manholes and pipes that are generally vulnerable to damage. There is no disclosure regarding the reinforcement pipe and seismic reinforcement method.

  Further, in such a conventional earthquake-resistant sleeve, a gap is easily formed at the joint portion between the water supply / drain pipe and the earthquake-resistant sleeve, and bubbles are allowed to exist in the gap, and bacteria are likely to propagate there, which is not preferable. In addition, a fluid that flows through the pipe at a high speed enters the gap and easily causes a failure in which the sleeve is peeled off.

  In general, earth pipes have been used for small ones and fume pipes have been used for large ones in order to supply irrigation water and sewerage as well as water and wastewater such as liquefied natural gas and industrial water. The importance of seismic structures has been reconsidered in view of the liquefaction phenomenon caused by earthquakes, which has been attracting attention in recent years, as well as damage such as damage to feed pipes for water supply and drainage. Due to the liquefaction phenomenon, the surrounding earth and sand and sludge flow into the pipe, which makes it impossible to supply normal water and wastewater, leading to increased damage.

  In response to such demands, the present invention proposes a seismic reinforcing pipe that further improves the construction itself and construction of the seismic reinforcing structure such as a water supply / drainage pipe including a manhole, and an in-pipe seismic reinforcing method. . That is, it aims at providing the seismic reinforcement pipe | tube in a water supply / drainage pipe and the seismic reinforcement construction method in a pipe | tube regardless of a new installation or the existing installation.

  In order to achieve the above object, according to the first aspect of the present invention, in the seismic reinforcing pipe in which the seismic layer is installed on the entire circumference of the water supply / drainage pipe composed of a soil pipe or a fume pipe including a manhole, a predetermined range in the cylindrical direction is provided. A quick-drying resin having elasticity is laminated on the entire circumference of the inner peripheral surface of the pipe by spraying, and a peeling prevention means is formed at the end.

  Further, according to the invention described in claim 2, in the seismic reinforcement pipe in which the seismic layer is installed on the entire circumference of the water supply / drainage pipe composed of a soil pipe or a fume pipe including a manhole, the inner circumferential surface of the pipe in a predetermined range in the cylindrical direction is provided. The quick-drying resin having elasticity is laminated on the entire circumference by spraying, and the laminated portion is pressed against the inner circumferential surface toward the outer diameter direction by a metal band including a driving wedge on the upstream side of the water supply / drainage pipe in the lamination area. Features.

  Furthermore, according to the invention described in claim 3, in the seismic reinforcement pipe in which the seismic layer is installed on the entire circumference of the water supply / drainage pipe made of a soil pipe or a fume pipe including a manhole, the inner peripheral surface of the pipe in a predetermined range in the cylindrical direction is provided. A quick-drying resin having elasticity is laminated on the entire circumference by spraying, and a circumferential groove is formed at the end of the lamination area to form a thick portion in the outer circumferential direction.

  Furthermore, according to the invention described in claim 4, in the pipe seismic reinforcement method for a water supply / drainage pipe including a manhole made of an existing earth pipe or a fume pipe, elasticity is applied to the entire circumference of the pipe inner peripheral surface in a predetermined range in the cylindrical direction. The quick-drying resin is laminated by spraying, and the peeling prevention means is configured at the end of the lamination area.

  Furthermore, according to the invention described in claim 5, in the pipe seismic reinforcement method for a water supply / drain pipe including a manhole made of an existing earth pipe or a fume pipe, elasticity is applied to the entire circumference of the pipe inner peripheral surface in a predetermined range in the cylindrical direction. The quick-drying resin is laminated by spraying, and the laminated portion is pressed against the inner peripheral surface in the outer radial direction by a metal band including a driving wedge on the upstream side of the water supply / drainage pipe in the lamination region.

  According to invention of Claim 1, in the seismic reinforcement pipe | tube which installed the earthquake-resistant layer in the perimeter of the pipe of the water supply / drainage pipe which consists of a soil pipe or a fume pipe containing a manhole, the perimeter of the pipe inner peripheral surface of the predetermined range in a cylindrical direction Further, it is possible to provide an earthquake-resistant reinforcing pipe characterized in that a quick-drying resin having elasticity is laminated by spraying and a peeling preventing means is formed at the end.

  Since such a structure, that is, a quick-drying resin having elasticity is laminated by spraying, it has adhesion without causing a gap between the inner peripheral surface of the pipe, the laminated surface, and the paint surface, and is earthquake resistant. A strong earthquake-resistant reinforcement tube can be provided. Thus, since it has adhesiveness and airtightness, it is possible to prevent the generation of bacteria in the bubbles generated in such gaps, protect the laminated resin by means of anti-peeling at the end, and further swell the clay pipe The water supply and drainage pipes are protected from collapse due to corrosion.

  Further, according to the invention described in claim 2, in the seismic reinforcement pipe in which the seismic layer is installed on the entire circumference of the water supply / drainage pipe composed of a soil pipe or a fume pipe including a manhole, the inner circumferential surface of the pipe in a predetermined range in the cylindrical direction is provided. The quick-drying resin having elasticity is laminated on the entire circumference by spraying, and the laminated portion is pressed against the inner circumferential surface toward the outer diameter direction by a metal band including a driving wedge on the upstream side of the water supply / drainage pipe in the lamination area. The characteristic seismic reinforcement pipe can be provided.

  With such a configuration, the quick-drying resin is laminated by spraying, and the laminated portion is pressed against the inner peripheral surface in the outer diameter direction by a metal band including a driving wedge. It is possible to provide earthquake-resistant reinforcement pipes that are highly earthquake-resistant against animal water supply and drainage. Further, even when the water supply / drainage pipe is damaged due to an external pressure such as an earthquake, the flow of the fluid generated by the liquefaction phenomenon is prevented from flowing into the water supply / drainage pipe, thereby preventing the loss of the water supply / drainage function.

  Furthermore, according to the invention described in claim 3, in the seismic reinforcement pipe in which the seismic layer is installed on the entire circumference of the water supply / drainage pipe made of a soil pipe or a fume pipe including a manhole, the inner peripheral surface of the pipe in a predetermined range in the cylindrical direction is provided. It is possible to provide an earthquake-resistant reinforcing tube in which a quick-drying resin having elasticity is laminated on the entire circumference by spraying, and a circumferential groove is formed at the end of the laminated region to form a thick portion in the outer circumferential direction.

  With such a configuration, it is possible to easily repair existing water supply and drainage pipes, and when constructed on water supply and drainage pipes that are easily damaged, recovery after the earthquake can be recovered early. .

  Furthermore, according to the invention described in claim 4, in the pipe seismic reinforcement method for a water supply / drainage pipe including a manhole made of an existing earth pipe or a fume pipe, elasticity is applied to the entire circumference of the pipe inner peripheral surface in a predetermined range in the cylindrical direction. It is possible to provide an in-pipe seismic reinforcement method characterized in that the quick-drying resin is laminated by spraying, and an anti-peeling means is configured at the end of the laminated region.

  With such a configuration, it is possible to easily repair existing water supply and drainage pipes, and when construction is performed on water supply and drainage pipes that are easily damaged, recovery after the earthquake can be recovered early.

  Furthermore, according to the invention described in claim 5, in the pipe seismic reinforcement method for a water supply / drain pipe including a manhole made of an existing earth pipe or a fume pipe, elasticity is applied to the entire circumference of the pipe inner peripheral surface in a predetermined range in the cylindrical direction. In-pipe seismic reinforcement characterized by laminating a quick-drying resin with spraying and pressing the laminated part against the inner peripheral surface in the outer radial direction by a metal band including a driving wedge on the upstream side of the water supply and drainage pipe in the lamination area A construction method can be provided.

  With such a configuration, the post-earthquake recovery can be quickly recovered in the same manner as in the effect of claim 4 above, and the pipe is improved in seismic resistance because it is difficult to cause separation on the upstream side of the fluid supply / drainage pipe with a steep flow velocity. A seismic reinforcement method can be realized.

It is sectional drawing of the water supply / drain pipe containing the manhole by one Embodiment of this invention. It is a cross-sectional perspective view which shows the state which attaches a band to the water supply / drain pipe containing the manhole by one Embodiment of this invention. It is sectional drawing from the horizontal direction of the earthquake-resistant sleeve for pipes by a prior art example. It is a destructive test photograph of a water supply and drainage pipe including a manhole by one embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a resin liquid heated to about 60 ° C. is sprayed on the inner peripheral surface of a pipe by a spray nozzle and directly laminated on the surface of the pipe to a water supply / drain pipe 20 comprising a manhole-containing earth pipe or a fume pipe. It is formed with about 2,7 ~ 3.5mm. The inner surface of the tube formed in this way is directly coated with paint, so there is no gap between the soil tube or the fume tube in close contact with the surface, and pinholes are not easily formed. And covered with a seamless coating.

  The resin liquid used here becomes a fluid state suitable for spraying by heating, and when it returns to room temperature, it dries relatively quickly and has elasticity at room temperature. An example of a specific product is a polyurea resin, and the polyisocyanate component (agent A) and the special polyamine component (agent B) are pumped at high pressure while heating and temperature control, and mixed with a dedicated gun. To form a thin resin film M.

  The feed pipe 20 formed in this way constitutes a seismic reinforcement pipe 21 as a whole. In addition, although the thickness to laminate | stack can be set suitably according to a use purpose, if it sets to about 2,7-3,5mm as above-mentioned, it is thought that it is preferable economically and seismically withstand pressure | voltage-proof.

  As shown in FIG. 1, when the manhole H communicating with the ground and the plurality of feeding pipes 20 are buried at different depths from the ground, the embodiment according to the present invention is efficiently performed. Function. In particular, since it can be applied to the existing feed pipes in accordance with each form, each part of the department where the feed pipe 20 is irregularly connected to the manhole H has its own vibration and impact. Because it is easy to receive, the strength is maintained in the event of an earthquake and the occurrence of breakage and cracks can be reduced.

  That is, the individual parts connected to the manhole H shown in FIG. 1 are not uniform with respect to earthquakes and impacts, and abnormal forces are easily applied to the individual parts due to individual vibrations. Is more likely to occur than other straight pipe-shaped parts. Therefore, it is required to improve the strength around the manhole and prevent the occurrence of breakage and cracks.

  In other words, each of the seismic reinforcing pipes 21a and 21b is restrained by the manhole H because the vibration or impact of the part extending away from the manhole H is restrained by the manhole H, and an extremely abnormal force is easily applied to the connecting portion. For this reason, the connection portion is easily damaged or cracked by the internal stress generated in this portion. In this case, if the individual feed pipes 20 are seismic reinforcement pipes 21 whose interiors are continuously covered with resin along with the manholes H, even when cracks or breakage occurs in the earth pipe or the fume pipe, the resin coating M Since it is protected by the resin film M, the possibility that the fluid inside flows out to the outside or the inflow from the outside into the pipe is covered with the resin coating M is extremely reduced.

  That is, FIG. 4 shows a broken state of the fume tube in which a destructive test was performed by applying a high-pressure impact to the seismic reinforcing tube 21 according to the present invention. As is apparent from the photograph, even if the feeding tube 20 is broken, the above-mentioned fact is supported because the inner resin laminated portion is not damaged.

  In FIG. 1 and FIG. 2, since the resin coating M is covered with a continuous coating without any breaks from the feed pipe 20 to the inside of the manhole H, the individual seismic reinforcement pipes 21a and 21b are separated from the manhole H, respectively. Even if the vibration or impact of the part extending in the direction of separation is restrained by the manhole H and an extremely abnormal force is applied to this connection part, the seismic reinforcement pipes 21a and 21b are caused by internal stress generated in this part. The risk of damage or cracking throughout is greatly reduced.

  Further, on the upstream side of the portion where the feed pipe 20 is covered with the resin coating M, the end of the resin coating M is peeled off from the inner peripheral surface of the pipe when the flow velocity of the fluidized body is steep. Since such a force acts, it is desirable to keep this end portion strong.

  Therefore, as shown in FIG. 2, the sealing bands 22, 23, 24 are connected and inserted into the seismic reinforcement tube 21 and the driven wedge 25 is connected to the sealing bands 22 and 24 from the narrow portion 25a side. It is arranged to be inserted between them. For driving the driving wedge 25, the driving wedge 25 is inserted into the gap 28 from the narrow width portion 25a as described above from the one mouth portion in the cylindrical direction toward the wide and narrow mouth portion. It is driven in. As a result, the end portions of the resin coating M are attached to the inner peripheral surface of the pipe in the sealing bands 22, 23, and 24, so that the end of the resin coating M remains in the pipe even at a place where the flow velocity of the flowing object in the pipe is steep. A force that can be peeled off from the peripheral surface does not act, and damage or peeling from this portion can be prevented.

  Here, if the separation band is relatively small without attaching the sealing band, the inner end of the pipe is changed by the flow velocity of the fluid in the pipe by reinforcing the thickness of the end instead of the band. In order not to be peeled off, the part can be reinforced and finished firmly. That is, as shown in FIG. 1, a groove Ha is formed in the tube wall portion corresponding to the end portion in advance, and when the resin liquid is sprayed on the inner peripheral surface of the tube by the spray nozzle, the surface of the tube including the groove Ha directly in this portion. Therefore, the thickness of the groove portion is locally increased, and strength against deformation in the circumferential direction can be provided. Therefore, the strength is increased by the wall thickness of this portion, and it is possible to achieve a strong finish by acting so as not to be peeled off by the flow velocity of the fluid body in the pipe. In FIG. 1, the groove Ha is exaggerated for easy understanding, but it is not necessary to make the groove Ha so deep. On the other hand, if the depth is too deep, the strength of this part of the earth pipe or the fume pipe is reduced and warped, leading to breakage from this part.

  In addition, this invention is not limited to the said embodiment, Embodiment can be changed suitably and implemented within the range of the technical idea of this invention.

20 ... feed pipe
21 ... Seismic reinforcement pipe
22 ・ ・ ・ Sealing band
23 ・ ・ ・ Sealing band
24 ・ ・ ・ Sealing band
25 ... Driving wedge H ... Manhole M ... Resin coating

Claims (5)

In the seismic retrofit pipe with the seismic layer installed on the entire circumference of the water supply and drainage pipe consisting of earth pipe or fume pipe including manhole,
A seismic reinforcing pipe characterized in that a fast-drying resin having elasticity is laminated on the entire circumference of the inner peripheral surface of the pipe in a predetermined range in the cylindrical direction, and a peeling prevention means is formed at the end. In the seismic retrofit pipe with the seismic layer installed on the entire circumference of the water supply and drainage pipe consisting of earth pipe or fume pipe including manhole,
A fast-drying resin having elasticity is laminated by spraying on the entire circumference of the inner circumferential surface of the pipe in a predetermined range in the cylindrical direction, and toward the outer diameter direction by a metal band including a driving wedge upstream of the water supply / drainage pipe in the lamination area. An anti-seismic reinforcement pipe characterized in that the laminated part is pressed against the inner peripheral surface. In the seismic retrofit pipe with the seismic layer installed on the entire circumference of the water supply and drainage pipe consisting of earth pipe or fume pipe including manhole,
A fast-drying resin having elasticity is laminated on the entire circumference of the inner circumferential surface of the pipe in a predetermined range in the cylindrical direction, and a circumferential groove is formed at the end of the laminated area to form a thick portion in the outer circumferential direction. Seismic reinforcement pipe characterized by In the seismic reinforcement method for pipes of water supply and drainage pipes including manholes consisting of existing earth pipes or fume pipes,
An in-pipe seismic reinforcement method characterized by laminating a quick-drying resin having elasticity on the entire inner circumference of a pipe in a predetermined range in the cylindrical direction by spraying and forming an anti-peeling means at the end. In the seismic reinforcement method for pipes of water supply and drainage pipes including manholes consisting of existing earth pipes or fume pipes,
A fast-drying resin having elasticity is laminated by spraying on the entire circumference of the inner circumferential surface of the pipe in a predetermined range in the cylindrical direction, and toward the outer diameter direction by a metal band including a driving wedge upstream of the water supply / drainage pipe in the lamination area. In-pipe seismic reinforcement method, characterized in that the laminated part is pressed against the inner peripheral surface.