JP5166938B2 - How to connect existing pipe lining pipe and branch pipe - Google Patents

Description

  The present invention relates to a method for connecting a lining pipe for rehabilitating an existing pipe such as an aged water pipe and a branch pipe of the existing pipe.

Conventionally, a lining pipe made of a thermoplastic resin such as vinyl chloride, which is smaller in diameter than the inner diameter of the existing pipe and recovers the shape of the circular pipe at the shape memory temperature, is inserted into the existing pipe buried in the ground, A rehabilitation method has been proposed and widely practiced, in which a lining pipe is heated and pressurized to expand and expand to restore a circular pipe shape, and then the lining pipe is closely adhered to the inner peripheral surface of the existing pipe (for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-230212

  By the way, in the above-mentioned existing pipe rehabilitation method, when a branch pipe is connected to the existing pipe, it is necessary to connect the lining pipe and the branch pipe. In particular, when water is pumped at a constant pressure, such as tap water or agricultural water, the water pressure acts on the connecting part between the lining pipe and the branch pipe, so the lining pipe and the branch pipe must be securely stopped. Need to connect. Specifically, a branch pipe is bonded to the lining pipe, or the branch pipe is manufactured by FRP hand layup, and in order to ensure reliability, a large-scale connection with a branch portion provided in the dresser joint It was necessary to use a member.

  Of these, the method of bonding the branch pipe to the lining pipe and the method of manufacturing the branch pipe by FRP hand lay-up have low water-stopping properties, and also depend on the field conditions such as weather and temperature, so the workability is also good. Low. In particular, when a high water pressure of 0.4 MPa or more is applied, there is a drawback that the reliability is low. In addition, in the method using a large connecting member, it is necessary to cut the existing pipe once, which causes an increase in cost and construction period, and the existing pipe cannot be cut depending on the field conditions such as a water pipe bridge. In some cases, construction is not possible.

The present invention has been made in view of such problems, and in the case where an existing pipe having a branch pipe is rehabilitated by the lining pipe, the lining pipe and the branch pipe can be easily connected while ensuring water-stopping. The present invention provides a method for connecting existing lining pipes and branch pipes.

The present invention has a threaded portion in a lining pipe at a position corresponding to a branch portion of an existing pipe after fixing the circular pipe-shaped thermoplastic resin lining pipe on the inner peripheral surface of the existing pipe and rehabilitating the existing pipe. An attachment hole is formed through which the tubular body portion of the connecting member formed by providing a flange portion provided with a water blocking material on the outer surface on the side where the tubular body portion is provided at one end of the tubular body portion. Pull out the tube part from the inside of the lining pipe through the mounting hole, and then attach the gripping member to the pipe part, while heating and softening the peripheral part of the mounting hole of the lining pipe, and tighten the nut on the threaded part of the pipe part After screwing in, the peripheral edge of the mounting hole of the lining pipe is formed flat, and the water stop material is pressed evenly and sandwiched between the flange portion of the connection member and the holding member, and then the pipe body of the connection member A branch pipe is connected to the section.

According to the present invention, the existing pipe is rehabilitated by fixing the circular pipe-shaped thermoplastic resin lining pipe to the inner peripheral surface of the existing pipe to be lined. Next, after forming a mounting hole in the lining pipe at a position corresponding to the branch portion of the existing pipe, the pipe body portion of the connecting member is pulled out from the inside of the lining pipe through the mounting hole, and the holding member is attached to the pipe body portion. , screwing the nuts on the threaded portion, sandwiching the mounting hole periphery of the lining pipe between the flange portion and the clamping member of the connecting member to secure the connecting member to the lining pipe. Here, by heating and softening the peripheral part of the mounting hole of the lining pipe, the peripheral part of the mounting hole of the lining pipe is formed flat, and the water stop material disposed on the collar part of the connecting member is pressed evenly. The lining pipe is closely attached to the periphery of the mounting hole, the space between the lining pipe and the connecting member is sealed, and water is stopped. Next, the branch pipe is connected to the tube portion of the connection member.

  As a result, an internal pressure such as tap water or agricultural water acts, and when the existing pipe having the branch pipe is rehabilitated with the lining pipe, the lining pipe and the branch pipe can be connected with securing water-stopping.

  In the present invention, it is preferable that the connection member and the holding member are made of metal in order to ensure water stoppage. Specific examples include steel, stainless steel, and aluminum.

  In the present invention, the connection member and the holding member are made of a synthetic resin, and it is possible to adhere the brim portion of the connection member and the holding member by applying an adhesive to the inner and outer peripheral surfaces of the periphery of the mounting hole of the lining pipe. It is preferable in securing the above.

  In the present invention, the wire is inserted through the mounting hole of the lining pipe to one end of the lining pipe, and after connecting the connection member to one end of the wire, the wire is pulled to pull the connection member into the lining pipe and attach the tubular portion. It is preferable to pull up through the hole. Thereby, even when the existing pipe is long and has a branch pipe in the middle thereof, it is possible to attach the connecting member and connect the branch pipe.

Here, as a method for forming the lining pipe, a reversal method or the like can be cited in addition to a normal method, and there is no particular limitation. As the lining pipe, as long as it has a certain strength against internal pressure and earth pressure as the tube, for example, mention may be made of rigid polyvinyl chloride, polyethylene, thermoplastic resins such as polypropylene.

Since lining pipe is usually circular tube shape, upon attachment of the connecting member, if it can not evenly press the water stopping material by tabular flange portion and clamping member is flat peripheral portion of the attachment hole formed There is a need to. For example, when the lining pipe is made of a thermoplastic resin, the connecting member may be attached by heating and softening.

  In this case, the present invention can be applied when the pipe diameter of the branch pipe is relatively small with respect to the pipe diameter of the existing pipe, for example, about 1/3 or less. If the diameter of the branch pipe with respect to the pipe diameter of the existing pipe exceeds 1/3, when the peripheral edge of the mounting hole is formed flat, the cross-sectional deformation of the lining pipe increases, which may affect water pumping. is there.

  According to the present invention, when an existing pipe having a branch pipe is rehabilitated by a lining pipe, the lining pipe and the branch pipe can be easily connected while ensuring water-stopping.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The lining pipe 1, the connecting member 2, and the holding member 3 are used for the connection method of the existing lining pipe and branch pipe of the present invention.

  The lining pipe 1 is obtained by heating a lining pipe formed into a circular pipe shape with a thermoplastic resin such as hard vinyl chloride and closely contacting the inner peripheral surface of the existing pipe K.

  As is well known, the lining pipe is folded into a substantially U shape in a state before being inserted into the existing pipe K so that the diameter is substantially smaller than the inner diameter of the existing pipe K. It is formed and has the ability to recover its shape to a circular tube shape when heated to a predetermined shape memory temperature.

  As shown in FIG. 4, the connecting member 2 is formed by integrally providing a collar portion 22 at one end of the tube portion 21 with a metal material, for example, steel, stainless steel, aluminum or the like. And the external thread 211 is formed in the outer peripheral surface of the pipe part 21 of the connection member 2, and the nut 4 can be screwed in. The flange 22 of the connecting member 2 is formed with an annular groove 22a on the outer surface on the side where the tube portion 21 is provided, and a water stop material 23 such as an O-ring is disposed in the groove 22a. It is installed.

  Here, the inner diameter of the tube part 21 of the connecting member 2 has an inner diameter necessary for a branch pipe.

  The holding member 3 has an insertion hole 3a having a diameter slightly larger than the outer diameter of the tube portion 21 of the connection member 2 and is a metal disk-shaped plate material corresponding to the connection member 2. It is used for sandwiching the lining pipe 1 with the portion 22.

  Next, the construction procedure for renewing the existing pipe K having the branch pipe with the lining pipe and connecting the branch pipe of the existing pipe K and the lining pipe 1 will be described.

  Note that the branch pipe of the existing pipe K is flange-connected to the branch start-up portion Ka of the existing pipe K, and is removed when the existing pipe is renovated.

  First, as before, the existing pipe K is rehabilitated with a lining pipe. Specifically, although not shown in detail, after the lining pipe is drawn into the existing pipe K using a winch or the like from one end to the other end of the existing pipe K, both ends are closed inside. By supplying a heating medium such as heated steam, the lining pipe is softened and restored to the shape of a circular pipe, and is expanded and expanded to be in close contact with the inner peripheral surface of the existing pipe K. If the lining pipe is in close contact with the inner peripheral surface of the existing pipe K, the supply of the heating medium is stopped, while a cooling medium such as normal temperature pressurized air is supplied to the lining pipe, exceeding the glass transition temperature and below the set temperature. Then, the supply of the cooling medium is stopped, and the lining pipe is cut at the end of the existing pipe K. Thereby, the lining pipe | tube 1 is fixed to the internal peripheral surface of the existing pipe | tube K, and the existing pipe | tube K is renewed (refer FIG. 1).

  If the lining pipe 1 is formed on the inner peripheral surface of the existing pipe K, the mounting hole 1a is centered on the lining pipe 1 at the center of the branch rising section Ka at a position corresponding to the branch rising section Ka of the existing pipe K. Are substantially matched (see FIG. 2). The inner diameter of the mounting hole 1 a is set to be slightly larger than the outer diameter of the tube part 21 of the connecting member 2.

  Next, the wire W is inserted into the lining pipe 1 through the attachment hole 1 a of the lining pipe 1 and led to one end side of the lining pipe 1. And after connecting the connection member 2 to the front-end | tip of the wire W using an adhesive tape etc. in the one end side of the lining pipe | tube 1, the connection member 2 is drawn in the inside of the lining pipe | tube 1 by pulling the wire W ( 3), the tubular body portion 21 is pulled up through the mounting hole 1a of the lining tube 1 (see FIG. 4).

  Here, when the connecting member 2 is pulled into the lining pipe 1, the water-stopping material 23 is used by using an adhesive so that the water-stopping material 23 disposed in the concave groove 22 a of the collar portion 22 does not fall off. Temporarily fix.

  On the other hand, after attaching the holding member 3 to the tube portion 21 of the connecting member 2 pulled outward through the mounting hole 1 a of the lining pipe 1, the nut 4 is screwed into the threaded portion 211 of the tube portion 21, and the holding member 3. Is pressed against the lining pipe 1 and sandwiched between the flange portion 22 of the connecting member 2. Thereby, the periphery of the mounting hole 1a of the lined pipe 1 is sealed with the water stop material 23, and water is stopped.

  At this time, when the water stop material 23 disposed on the flange portion 22 of the connecting member 2 cannot be pressed uniformly due to the radius of curvature of the lining pipe 1, the peripheral portion of the mounting hole 1 a of the lining pipe 1 is heated with a hot air heater or gas. The nut 4 is screwed in a state of being heated and softened by a burner, steam, or the like, the periphery of the mounting hole 1a of the lining pipe 1 is formed flat, and the water stop material 23 is pressed evenly to stop water.

  If the connecting member 2 is attached to the attachment hole 1a of the lining pipe 1, the flange of the branch pipe is joined to the flange of the branch riser Ka of the existing pipe K (see FIGS. 6 and 7), and then protrudes from the flange. A branch tape (not shown) is connected by winding a seal tape around the male screw 211 of the tube portion 21 of the connecting member 2.

  As a result, it is possible to easily connect the lining pipe 1 and the branch pipe while keeping the water stop and suppressing the construction period and cost. In addition, the connecting member 2 and the holding member 3 can be manufactured in advance, and can be constructed without being affected by on-site conditions.

  As an example, a water pipe bridge having a pipe diameter of 150 mm × pipe length of 60 m and an internal water pressure of 0.75 MPa was renovated by a lining pipe 1 made of thermoplastic resin, and then an air valve as a branch pipe was attached again.

  Here, the inner diameter of the branch raising portion Ka for attaching the air valve is 125 mm, and the inner diameter of the air valve is 25 mm. Further, the inner diameter of the tube portion 21 of the connecting member 2 is 25 mm, the nominal diameter of the screw is M36, the outer diameter of the collar portion 22 is 80 mm, and the water blocking material 23 is an O-ring having a diameter of 5 mm and an outer diameter of 60 mm.

  Moreover, in order to ensure safety, after attaching the connecting member 2 to the lining pipe 1, the connecting member 2 was fixed by filling the branch raising portion Ka with mortar.

  In the above-described embodiment, the case where the connection member 2 and the holding member 3 are formed of a metal such as stainless steel has been described. In this case, it is preferable to apply the adhesive to the inner peripheral surface and the outer peripheral surface of the peripheral edge of the mounting hole 1a of the lining pipe 1 to adhere the connecting member 2 and the holding member 3 in order to ensure water-stopping.

  In addition, when the existing pipe is a buried pipe, it may be constructed after excavating and exposing the connecting portion of the branch pipe to the existing pipe.

It is process drawing explaining one Embodiment of the connection method of the lining pipe and branch pipe of the existing pipe of this invention. It is process drawing explaining one Embodiment of the connection method of the lining pipe and branch pipe of the existing pipe of this invention. It is process drawing explaining one Embodiment of the connection method of the lining pipe and branch pipe of the existing pipe of this invention. It is process drawing explaining one Embodiment of the connection method of the lining pipe and branch pipe of the existing pipe of this invention. It is process drawing explaining one Embodiment of the connection method of the lining pipe and branch pipe of the existing pipe of this invention. It is process drawing explaining one Embodiment of the connection method of the lining pipe and branch pipe of the existing pipe of this invention. It is the sectional view on the AA line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lining pipe 1a Mounting hole 2 Connection member 21 Pipe part 22 Collar part 23 Water-stop material K Existing pipe

Claims (4)

After fixing the circular pipe-shaped thermoplastic resin lining pipe to the inner peripheral surface of the existing pipe and rehabilitating the existing pipe, the pipe section having a thread portion is attached to the lining pipe at a position corresponding to the branch portion of the existing pipe. An attachment hole is formed through which the tubular portion of the connecting member formed by providing a flange portion provided with a water blocking material on the outer surface on the side where the tubular portion is provided at one end, and the tubular portion of the connecting member Is pulled out from the inside of the lining pipe through the mounting hole, and then the holding member is attached to the pipe body , while the peripheral part of the mounting hole of the lining pipe is heated and softened, and a nut is screwed into the threaded portion of the pipe body to line the lining. The pipe mounting hole periphery is formed flat, and the water stop material is pressed evenly and sandwiched between the brim portion of the connection member and the holding member while stopping the water, and then branched to the tube portion of the connection member contact with the lining tube of the existing pipe, characterized the branch pipe connecting the Method. In connection of the lining tube of the existing pipe according to claim 1 and the branch pipe, the connection method between the lining pipe and the branch pipe of the existing pipe, wherein the connecting member and the clamping member is made of metal. 2. The method for connecting a lining pipe and a branch pipe of an existing pipe according to claim 1, wherein the connecting member and the holding member are made of synthetic resin, and an adhesive is applied to the inner and outer peripheral surfaces of the periphery of the mounting hole of the lining pipe. A method for connecting a lining pipe and a branch pipe of an existing pipe, wherein a flange portion of a member and a holding member are bonded. 4. The method of connecting a lining pipe of an existing pipe and a branch pipe according to any one of claims 1 to 3, wherein a wire is inserted through an attachment hole of the lining pipe to one end of the lining pipe, and a connecting member is connected to one end of the wire. And connecting the lining pipe and the branch pipe of the existing pipe by pulling the wire and pulling the connecting member into the lining pipe and pulling up the pipe body portion through the mounting hole.

Images