JP2007023522A - Earthquake-proof structure of buried pipe and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earthquake-proof structure of a buried pipe for preventing breakage of the pipe buried into the ground, in particular, a pipeline in the vicinity of a place restrained by a fixed constructed structure due to earthquake and preventing occurrence of functional disorder. <P>SOLUTION: This earthquake-proof structure of the buried pipe is constituted in such a way that the pipe buried into the ground constituted by providing an anti-corrosive internal pipe on an inner side of a rigid external pipe is provided with an integrated structure constituted by providing a cavity between an internal wall of the external pipe and an external wall of the internal pipe and filling and sealing soft elastic filler into a cavity corresponding to a section where the pipe buried into the ground is restrained by the underground fixed constructed structure and a section including a position in its vicinity, the anti-corrosive internal pipes connected by a flexible annular connection member are introduced into an inner side of the rigid buried pipe restrained by the underground fixed constructed structure by leaving a cavity on their outer sides, then a first annular sealing member for sealing the cavity is mounted in a cavity up to a position deviated further from an outer side face position of the constructed structure and a second annular sealing member being similar to it is mounted in a cavity at an inner side face position of the constructed structure, and a liquid-like raw material for generating the soft elastic filler is poured and filled into a cavity between the first annular sealing member and the second annular sealing member and is integrally solidified and elasticized for manufacture. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an improved structure for making earthquake resistance of underground buried pipes, and more particularly, to an earthquake resistant structure for preventing buried pipes and sewage pipes passing through signal lines from being damaged by the occurrence of an earthquake.

  Various underground pipes such as waterworks, sewerage, city gas, electric power, communication, etc. are often buried underground such as roads, and these pipes are constructed of tough materials that can withstand earth pressure. Is normal. However, it is difficult to expect that the structure of the ground in which the pipe is embedded is constant and uniform, and in particular, in the pipe installed so as to penetrate the fixed structure such as a manhole wall, the periphery of the fixed structure is filled. Since the density of earth and sand tends to be non-uniform, the pipeline breaks or breaks in the vicinity of the position restrained by the fixed structure due to vibrations caused by heavy vehicles passing in the vicinity as well as the occurrence of an earthquake. There is concern that the function will stop.

  Therefore, in order to avoid the occurrence of the above-mentioned problems, a method of cleaning the inner surface of a pipeline that may cause a defect and applying a new lining with synthetic resin from the inside has been proposed, but the material is expensive. In addition, there is a drawback that the construction is not easy. In addition, a method has been proposed in which an inner pipe connected by an elastic coupling member is introduced into the pipe and the concrete is filled between the pipe and the inner pipe to reinforce it. There was a problem that it was difficult to ensure quality.

  As described above, the underground pipes that have been installed underground have a pipeline near the position where they are restrained by a fixed structure installed in the ground due to slight deformation of the ground due to earthquakes, traffic vibrations, etc. There was a risk that the malfunction of the pipe line would occur due to the inflow of groundwater and the leakage of pipe water. Therefore, the present invention provides an underground buried pipe that is unlikely to cause a malfunction of the pipeline even if a disaster such as an earthquake or a breakage of the pipeline occurs due to an accident, and that is relatively easy to construct and ensure quality. It is intended to provide an earthquake resistant structure.

  The seismicizing structure for an embedded pipe according to the present invention is an underground underground pipe in which a corrosion-resistant inner pipe is provided inside a rigid outer pipe, and a gap is provided between the inner wall of the outer pipe and the outer wall of the inner pipe. In addition, the underground buried pipe is provided with an integrated structure filled with a soft elastic filler in the gap corresponding to the place constrained by the underground fixed structure and the place including the vicinity thereof. It is a feature.

  In addition, such a seismic structure of the buried pipe according to the present invention is a corrosion-resistant structure formed by sequentially connecting a rigid buried pipe restrained by an underground fixed structure by a flexible annular coupling member. A first annular seal that can be installed by introducing the inner pipe from the structure-side open end of the buried pipe so as to leave a gap outside the inner pipe, and then sealing the gap from the structure-side open end A second annular sealing member capable of sealing the gap from the open end of the structure is installed in the gap by introducing the member into the gap further from the outer surface position of the structure. Introduce into and install in the gap at the inner side surface position, and then inject a liquid raw material for generating a soft elastic filler into the gap space between the first annular sealing member and the second annular sealing member It can be manufactured by filling and making the liquid raw material into an elastic body.

  Furthermore, another form of the seismic structure of the buried pipe according to the present invention is a first inner pipe that is longer than the restricted range of the structure inside the rigid buried pipe restrained by the underground fixed structure. The first annular sealing member that surrounds the front end and the second annular sealing member that surrounds the rear end are mounted so that a cylindrical gap is left between the buried pipe and the first inner pipe. The first and second seals are introduced from the structure-side open end of the buried pipe, between the buried pipe and the front end of the first inner pipe and between the rear end of the first inner pipe, respectively. A liquid raw material for generating a soft elastic filler is injected into and filled into the void space sealed at the front and rear by the first and second sealing portions to make the liquid raw material elastic. And a range of a corrosion-resistant second inner pipe having a rear end portion that can be inserted into the first inner pipe from a rear end portion of the first inner pipe to a desired position in the buried pipe. Introduced, followed by a step of coupling the rear end portion of the second inner tube in the rear end portion of the first inner tube can be manufactured.

  The seismic structure of the buried pipe according to the present invention is such that a corrosion-resistant inner pipe is provided inside a rigid buried pipe so as to leave a gap therebetween, and the earth pressure of the ground is received by the rigid outer pipe. In addition, the buried pipe penetrating the fixed structure, that is, the constrained outer pipe part vibrates integrally with the fixed structure, while the inner pipe part is elastically supported by the outer pipe by a soft elastic filler. Therefore, it is in a state of being isolated from the influence of ground vibration. Therefore, even if the ground is deformed by strong vibration such as an earthquake, if the degree of deformation is small and the outer tube breaks or breaks, the deformation is absorbed by the gap surrounding the inner tube, There is no change in earth pressure that causes shear in the tube. In addition, even if deformation occurs in the corrosion-resistant inner pipe, it will not break, so even if groundwater flows in due to damage to the outer pipe, the water pressure applied to the inner pipe is only averaged at the outer gap. Unless the amount of shear movement due to the occurrence of a fault is particularly large in the ground, the function of the inner pipe is not affected and an excellent seismic effect is obtained.

Hereinafter, the earthquake-proof structure of the buried pipe of the present invention will be described with reference to the drawings.
In the figure, 1 is a manhole of a structure provided at the middle point of a sewage pipe, and this manhole 1 changes the flow direction of an upstream sewage pipe to the flow direction of another downstream sewage pipe. A concrete fixed structure for directing sewage. The side wall 1a of the manhole 1 is provided with a connection hole 1b coupled to the upstream and downstream sewage pipes. For example, the terminal portion 2a of the upstream sewage pipe 2 is inserted into the connection hole 1b. It is bonded with cement mortar to prevent water leakage.

  The sewage pipe 2 was constructed by connecting ceramic pipes or the like sequentially in the previous equipment, but recently, concrete pipes are frequently used. The reinforced concrete pipe used is also used. However, if there are concerns about the stability of the ground, or if you want to increase the safety factor against the intensity and frequency of vibrations received from the environment, even if the sewer pipe 2 buried underground is damaged, It is necessary to be prepared so that the function of will not disappear.

  Therefore, in the first aspect of the present invention, after sufficiently cleaning the inner wall surface of the rigid sewage pipe 2 such as a concrete pipe, a bottom treatment or the like is added to enhance the adhesion to the elastic filler as necessary. In addition, a material that is corrosion resistant, has a long service life, is less brittle and hardly breaks, such as a pipe made of vinyl chloride or fiber reinforced synthetic resin, is introduced as an inner pipe 3 for circulating sewage. Install as follows. Such an inner pipe is not necessarily limited to the above-mentioned synthetic resin, and can be used for a long time without being corroded even if it comes into contact with sewage, and does not cause damage even if deformed by applying a certain external force Can be selected and used as appropriate. Further, since the inner pipe 3 formed of such a material can be installed in the sewage pipe 2 laid in a bent shape, the inner pipe unit is preferably formed by an annular coupling member 31 formed of an elastic synthetic resin or the like. It is desirable to connect 3a sequentially and introduce and install in the sewer pipe 2 while forming the inner pipe 3.

  Further, the inner pipe 3 introduced into the sewage pipe 2 has a sewage pipe 2 as necessary so that a gap 4 is formed between the inner wall of the sewage pipe 2 as an outer pipe and the outer wall of the inner pipe 3. It is desirable to install a pillow or the like on the bottom surface of the sewage pipe and then draw it in the upstream direction using, for example, a rope drawn from a manhole on the upstream side of the sewage pipe 2. And while temporarily fixing the upstream terminal part of the inner pipe 3 to the connection hole (not shown) of the upstream manhole, the downstream terminal part 3b of the inner pipe 3 is temporarily fixed to the connection hole 1b of the downstream manhole 1, Through the procedure described later, the upstream terminal portion and the downstream terminal portion 3b of the inner pipe 3 are temporarily fixed in the vicinity of the upstream connection hole and the downstream connection hole 1b, respectively.

  The operation of connecting the downstream end 3b of the inner pipe 3 to the connection hole 1b portion of the downstream manhole 1 is as follows. First, the end edge of the end 2a of the upstream sewage pipe 2 connected to the inside of the connection hole 1b Then, alignment with the edge of the downstream end portion 3b of the inner pipe 3 is performed and temporarily fixed. Then, for example, an expandable first annular sealing member 41 is brought into close contact with the circumference of the inner tube 3 in the gap 4 formed between the terminal portion 2a and the downstream end portion 3b. The first annular sealing member 41 is expanded and the first annular sealing member 41 is expanded so that the width of the void 4 is adjusted to be substantially uniform. The portion is divided into two portions, that is, a portion near the downstream manhole 1, that is, a gap space 4 a.

  Here, an inflatable hollow portion is provided inside the first annular sealing member 41, for example, via an expansion material injection connector 41a provided with a check valve, for example, a pressurized fluid such as air, It is configured so that it can be detachably connected to an expansion material injection tube that feeds liquid resin that solidifies to form an elastic body, but the expansion material is not limited to these and absorbs, for example, water Then, the hollow portion may be filled with a water-absorbing resin that expands and water may be injected, and the structure of the first annular sealing member 41 and the expansion means are not particularly limited.

  By the way, the mounting position of the first annular sealing member 41 with respect to the sewage pipe 2 is an outer position within a range where the sewage pipe 2 that is the outer pipe is likely to break due to, for example, an earthquake, that is, the side wall of the manhole 1. It is preferable to be at least a position about the diameter of the sewer pipe 2 from the position of the outer surface 1a. Therefore, after the first annular sealing member 41 is introduced into the outer side of the rear end 3b of the inner pipe 3, that is, into the gap 4, it is further upstream from the end of the sewer pipe 2, that is, the inner side surface position of the side wall 1a of the manhole 1. It is necessary to move in the gap 4 to the desired mounting position on the side. Therefore, in order to mount the first annular sealing member 41 at a desired position in the narrow gap 4, a sealing member introducing tool 5 suitable for the situation and dimensions of the sewage pipe 2 to be constructed is prepared, and each construction is performed. It is preferable to select an item suitable for the situation at the site and proceed with the work.

  An example of the sealing member introducing tool 5 is shown in FIG. 3, and an annular pusher 5a in which a circular hole through which the inner tube 3 can be inserted is formed at the front end, and the pusher 5a at the rear end. An operation body 5b having a large size is provided, and the push body 5a and the operation body 5b are integrally coupled by a plurality of tubular coupling bodies 5c parallel to the shaft. Further, a plurality of tongue-like projections 5d directed forward are provided at substantially equal intervals on the inner edge of the pusher 5a, and when the rear end 3b of the inner tube 3 is inserted into the circular hole of the pusher 5a. The sealing member introduction tool 5 is configured to be able to move back and forth surrounding the inner tube 3. Further, in such a sealing member introducing tool 5, an expansion material supply tube 5e for expanding the first annular sealing member 41 is disposed up to the position of the pusher 5a via the vicinity of the operating body 5b. The nozzle 5f provided at the tip of the expansion material supply tube 5e is attached to the expansion material injection connector 41a of the first annular sealing member 41 held around the plurality of tongue-shaped projections 5d. It is configured so that it can be combined. It should be noted that the above-described expansion material injection connector 41a and the nozzle 5f after the expansion material injection are preferably separated by remote control using an operation handle (not shown) provided on the operation body 5b.

  In order to introduce the first annular sealing member 41 to a desired mounting position using such a sealing member introduction tool 5, first, the first annular sealing member 41 is connected to the downstream end portion of the inner tube 3. After temporarily mounting around 3b and then covering the downstream end portion 3b with the feeding member 5a portion of the sealing member introduction tool 5, the first annular sealing member 41 is placed around the downstream end portion 3b. Then, it is moved to a position surrounding the plurality of tongue-like projections 5d. Further, an exhaust tube 45 configured by winding a fiber bundle with a sheet, for example, is straddled in the front-rear direction at a position that is the highest position of the first annular sealing member 41. If it carries out like this, the 1st annular sealing member 41 will be in the state which can be freely moved in the inside of the space | gap 4 by being supported by the tongue-shaped protrusion 5d of the sealing member introduction tool 5, and the operation body 5b of the sealing member introduction tool 5 will be in it. If it grasps and moves, the 1st annular sealing member 41 can be introduced into a desired position, and attachment work can be advanced.

  In this way, as shown in FIG. 4, the expansion material supply tube 5e is coupled to the first annular sealing member 41 that has moved to the desired mounting position, so that the expansion material is immediately applied to the first annular sealing member 41. When injected and expanded, the first annular sealing member 41 can be mounted and fixed at a desired position, as shown in FIG. After that, if the expansion material supply tube 5e is removed from the expansion material injection connector 41a together with the nozzle 5f by remote operation from the operation body 5b, the sealing member introduction tool 5 is retracted and removed together with the expansion material supply tube 5e. On the other hand, as shown in FIG. 6, the expanded first annular sealing member 41 can be left as it is in the mounting position.

  Next, in the same manner as described above, a second annular sealing member 42 with a check valve, to which an expansion material injection tube 43 is attached, is temporarily attached to the inner tube 3 in the vicinity of the inner surface position of the side wall 1a of the manhole 1, Furthermore, after the filler injection tube 44 for feeding the raw material of the elastic filler described later is disposed below the lowest position, the expansion material injection tube 43 and the like are attached to the second annular sealing member 42. The second annular sealing member 42 is mounted and fixed by injecting an expansion material or the like through the expansion. Thus, as shown in FIG. 7, a closed cylindrical gap space 4 a is formed between the first annular sealing member 41 and the second annular sealing member 42.

  The soft elastic filler filled in the void space 4a prevents the broken portion of the sewer pipe 2 from coming into direct contact with the inner pipe 3 when the sewer pipe 2 is broken due to an earthquake or the like, and is not damaged. It is intended to suppress expansion, and the filler itself is preferably an excellent rubber-like elastic body that resists deformation due to a large force and does not break. However, in the case of the filler used in the present invention, it is desirable to uniformly fill the entire void space 4a formed between the sewage pipe 2 and the inner pipe 3 which are outer pipes. First, a liquid raw material was poured into the space 4a and spread, and then the raw material was cross-linked to be converted into a rubber-like elastic body. As such an elastic filler, for example, liquid silicone rubber or polyurethane rubber can be used, but any material having strength characteristics and flexibility suitable for earthquake resistance may be used. However, it can be appropriately selected and used.

  The filler injected into the gap space 4a is injected into the gap space 4a via the filler injection tube 44 disposed at a low position. At this time, the air in the gap space 4a is the first air. It is discharged from a high position through the exhaust tube 45 sandwiched between the highest position of the annular sealing member 41 and the sewer pipe 2. When the filler injected from a low position fills the void space 4a, the filler enters the exhaust tube 45 instead of air, so that the flow resistance of the exhaust tube 45 increases and the filler The injection pressure rises rapidly. Therefore, the injection of the filler is stopped and waiting for the filler cross-linking reaction to proceed. Thus, when the predetermined cross-linking time elapses, the filler filled in the gap space 4a becomes elastic and has desired earthquake resistance, and at the same time, the outer tube and the inner tube are integrated with each other via the soft elastic filler 6. It will be in the combined state (FIG. 8).

  Therefore, since the end portion of the inner tube 3 remains exposed in the inner surface side connection hole 1b portion of the side wall 1a of the manhole 1, next, the exposed end portion of the inner tube 3 Or removing the unnecessary portion of the second annular sealing member 42 and the like, and filling and bonding between the end of the sewage pipe 2 that is the outer pipe and the end of the inner pipe 3 with concrete or the like, Alternatively, if necessary, the inner wall surface of the manhole 1 is repaired by using a means such as a new flange member 32 or the like, and the new sewer pipe system having a seismic structure is connected to the manhole 1. As shown in FIG. 1, it is possible to complete the seismic structure of the buried pipe of the present invention.

  The seismic structure of the buried pipe of the present invention manufactured as described above is provided with a corrosion-resistant inner pipe inside the rigid outer pipe, and between the inner wall of the outer pipe and the outer wall of the inner pipe. Provided with a structure in which a soft elastic filler is filled and sealed in the space corresponding to the place where the underground buried pipe is constrained by the underground fixed structure and the position including the vicinity thereof, while providing a space. However, as another form of the earthquake resistant structure, first, a first inner pipe is provided so that a gap is formed inside the rigid outer pipe, and the inner wall of the outer pipe and the inner pipe are formed in the same manner as described above. After filling and sealing with a soft elastic filler between the outer wall and forming an earthquake resistant structure, a corrosion-resistant second inner pipe capable of covering the inner wall surface of the first inner pipe is provided, The durability of the buried pipe can be increased. In the seismic structure obtained by any of these methods, when the rigid outer tube is damaged due to the structural change of the ground due to strong vibration such as an earthquake, the shape change due to the outer tube damage is Since it is relaxed by the soft elastic filling material that surrounds the tube and is sealed, it is dispersed and transmitted to the inner tube as a slight strain force, so there is a significant risk of losing the function as a buried tube Reduced.

  The seismic structure of the buried pipe of the present invention can be used not only as a means for enhancing the safety of the buried pipe, but also to prevent changes in the ground structure in order to prevent the function of the buried pipe from being damaged by vibration applied to the ground such as an earthquake. In order to prevent the risk of damaging the function of existing buried pipes, which can be used to repair and restore their functions by repairing existing buried pipes damaged by It can also be used as a means.

It is a longitudinal cross-sectional view which shows the earthquake resistant structure of the buried pipe of this invention. It is sectional drawing which shows the state which introduced the inner pipe | tube to the buried pipe | tube before providing an earthquake resistant structure. It is a perspective view of the sealing member introducing tool used when manufacturing the earthquake resistant structure of the buried pipe of the present invention. It is explanatory drawing of the process of introduce | transducing the 1st cyclic | annular sealing member in the manufacturing method of the earthquake resistant structure of the buried pipe of this invention. It is explanatory drawing of the process of mounting | wearing with the 1st cyclic | annular sealing member in the manufacturing method of the earthquake resistant structure of the buried pipe of this invention. It is explanatory drawing of the process of introducing the 2nd cyclic | annular sealing member in the manufacturing method of the earthquake-proof structure of the buried pipe of this invention. It is explanatory drawing of the process of mounting | wearing with the 2nd cyclic | annular sealing member in the manufacturing method of the earthquake resistant structure of the buried pipe of this invention. It is explanatory drawing of the process of filling the void space in the manufacturing method of the seismic-proof structure of the buried pipe of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manhole 1a Side wall 1b Connection hole 2 Sewage pipe 2a End part 3 Inner pipe 3a Inner pipe unit 3b Downstream side end part 31 Annular coupling member 32 Flange member 4 Cavity 4a Cavity space 41 1st annular sealing member 41a Expansion material injection | pouring connector 42 Second annular sealing member 43 Expansion material injection tube 44 Filling material injection tube 45 Exhaust tube 5 Sealing member introduction tool 5a Pushing body 5b Operation body 5c Connection body 5d Tongue projection 5e Expansion material supply tube 5f Nozzle 6 Elastic filler

Claims (4)

  An underground buried pipe in which a corrosion-resistant inner pipe is provided inside a rigid outer pipe, and a gap is provided between the inner wall of the outer pipe and the outer wall of the inner pipe, and the underground buried pipe is fixed to the underground. An earthquake resistant structure for a buried pipe, characterized in that an integrated structure in which a soft elastic filler is filled and sealed in the space corresponding to a place constrained by an object and a place including a position in the vicinity thereof.   Corrosion-resistant inner pipes, which are sequentially connected by a flexible annular coupling member inside a rigid buried pipe constrained by an underground fixed structure, are left so as to leave a gap outside the inner pipe. The first annular sealing member that can be installed by being introduced from the structure-side open end of the buried pipe and then can seal the gap from the structure-side open end is further removed from the position of the outer surface of the structure. A second annular sealing member capable of sealing the gap from the structure side open end is introduced and installed in the gap at the inner side surface of the structure, and then installed. A liquid raw material for generating a soft elastic filler is injected and filled in the space between the first annular sealing member and the second annular sealing member, and the liquid raw material is integrally made into an elastic body. And manufacturing method of earthquake resistant structure of buried pipe.   Inside the rigid buried pipe constrained by the underground fixed structure, a first inner pipe that is longer than the confining range of the structure and is surrounded by a first annular sealing member surrounding the front end and a second surrounding the rear end. An annular sealing member mounted is introduced from the structure-side open end of the buried pipe so as to leave a cylindrical gap between the buried pipe and the first inner pipe, and the buried pipe and the First and second sealing portions are formed between the front end portion of the first inner tube and between the rear end portions of the first inner tube, and then front and back by the first and second sealing portions. A step of injecting and filling a liquid material for generating a soft elastic filler into the void space sealed to form an elastic body of the liquid material, and a rear end portion that can be inserted into the first inner tube. The second corrosion-resistant second inner pipe is introduced into a range from the rear end portion of the first inner pipe to a desired position in the buried pipe, and then the rear end portion of the second inner pipe is introduced into the first inner pipe. Trailing edge Preparation of earthquake resistance structure characterized, buried pipes to include a step of binding to.   The manufacturing method of the earthquake-proof structure of a buried pipe according to claim 3, wherein the second inner pipe has flexibility.

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