JP5060184B2 - Connection method of branch pipe to underground main pipe and its connection structure - Google Patents

Description

  The present invention relates to a connection method for connecting a branch pipe such as a distribution pipe to an underground main pipe such as a sewer main and the connection structure thereof, and has improved the seismic isolation function of the connection portion between the underground main pipe and the branch pipe. The present invention relates to a connection method and a connection structure.

  Conventionally, as a connection method for connecting a branch pipe to an underground main pipe, a propulsion pipe is built from the ground toward the underground main pipe, and the propulsion pipe is lowered while the propulsion pipe reaches the underground main pipe. Open a connection hole in the underground main pipe with a raised auger, and after lifting the auger, insert a branch pipe provided with a joint pipe at the tip using the propelling pipe as a guide and connect the joint pipe and the connection hole. The connection method by non-open cutting that seals the connection part with a filler is adopted, and we have proposed this improvement method and implemented this method first.

  Recently, it has become an important issue to provide seismic isolation functions even for underground buried objects. However, in the connection method and connection structure as described above, in the normal form, the vertical or horizontal direction is applied to the connection part. Cannot have seismic isolation function.

Conventionally, as a connection structure for giving a pipe joint a seismic isolation function, a pipe joint with a bellows shape and a coil spring arranged on the outer periphery of a flexible pipe joint have been proposed (Patent Documents). 1-4) In the connection method by non-cutting as described above, it is difficult to provide the joint pipe with the earthquake resistance that expands and contracts in two directions by a normal connection method or connection structure. Therefore, recently, as suitable for this, a seismic propulsion method and pipe in which a coil spring is interposed between the insertion port of the pipe to be joined and the side of the receiving port of the succeeding pipe and a cover is provided on the outer periphery of the coil spring. A joint has been proposed (Patent Document 5).
Japanese Utility Model Publication No. 58-19185 Japanese Utility Model Publication No. 61-97680 JP-A 61-236990 Japanese Patent Laid-Open No. 10-61850 JP 2000-266260 A

  However, in the one described in Patent Document 5, expansion and contraction in the axial direction of the pipe to be joined and the subsequent pipe is ensured, but sufficient for bending in the left-right direction and movement in the cross-axis direction (horizontal direction). There is a possibility that the seismic isolation function cannot be provided.

  In order to provide a reliable seismic isolation function to the connection structure between the underground main pipe and the branch pipe as described above, it is necessary to study the filler that seals the gap between the tip of the joint pipe and the connection hole. For example, when a conventional mortar is used as in the prior art, there is a risk that peeling, cracking, or the like may occur due to vibration or the connection portion may be sheared.

  In addition, the filler is conventionally filled in the state where the propulsion pipe is in contact with the underground main pipe in the connection process, but there is a risk that work vibration and the like may be constantly applied to the propulsion pipe. If the vibration is applied later, the fixing of the sealing material is hindered, and this point needs to be examined.

  An object of the present invention is to provide a connection method and a connection structure of a branch pipe to the underground main pipe that can have a reliable seismic isolation function as a connection structure between the underground main pipe and the branch pipe.

In order to solve the above-mentioned problems, the present invention provides a method for connecting a branch pipe to an underground main pipe, and constructs a propulsion pipe from the ground toward the underground main pipe and the propulsion pipe reaches the underground main pipe. In this state, a connection hole is opened in the underground main pipe by the auger lowered in the propelling pipe, and after the auger is pulled up, a branch pipe with a joint pipe attached to the tip is inserted using the propelling pipe as a guide and the joint In the connection method of connecting the tip of the tube and the connection hole via the mounting tube main body, and sealing the connection portion with a filler,
The joint pipe is formed in a cylindrical shape, and a spiral groove is formed in a bellows shape on the outer peripheral surface thereof, and a flexible joint pipe main body, and a lower connecting member connected to the mounting pipe main body And an upper connecting member connected to the branch pipe, a coil spring-like reinforcing member disposed by being fitted in the spiral groove on the outer peripheral side of the joint pipe body, and an outer periphery of the reinforcing member. The joint pipe is formed as a seismic isolation joint, and the joint pipe body is formed into a cylindrical shape with an elastic material such as rubber, and a cylindrical portion is formed at the lower and upper parts of the joint pipe body, The lower connecting member and the upper and lower connecting members are inserted into the cylindrical portions, respectively, and the lower connecting member and the upper and lower connecting members are formed of hard plastic or the like, and on the outer peripheral surface of the inserting portion to the cylindrical portions. Is formed with a stopper,
The filler is made of clay cement as a main material and usually mixed with a cement and fiber binder and kneaded with water, and the connection is made in a state where the propulsion pipe is pulled up to the vicinity of the upper end of the joint pipe. The connecting method is characterized in that the filler is filled in a gap between a hole and the mounting pipe main body.

The connecting structure of the branch pipe to the underground main pipe is an auger in which the propulsion pipe is built from the ground toward the underground main pipe and the propulsion pipe is lowered in the propulsion pipe in a state of reaching the underground main pipe. To open a connection hole in the underground main pipe, and after pulling up the auger, insert a branch pipe with a joint pipe attached to the tip using the propelling pipe as a guide and attach the tip of the joint pipe and the connection hole In the connection structure of the branch pipe to the underground main pipe formed by connecting through the pipe body and sealing the connection portion with a filler,
The joint pipe has a cylindrical shape, and a spiral groove is formed in an outer peripheral surface in a bellows shape, and has a flexible joint pipe main body, a lower connection member connected to the mounting pipe main body, and a connection to the branch pipe An upper connecting member, a coil spring-like reinforcing member arranged by being fitted to the spiral groove on the outer peripheral side of the joint pipe main body, a cover tube arranged to cover the outer periphery of the reinforcing member, the joint tube have a seismic isolation function in configuration to,
The joint pipe body is formed in a cylindrical shape with an elastic material such as rubber, and cylindrical parts are formed at the lower and upper parts of the joint pipe body, and the lower connection member and the upper and lower connection members are inserted into the cylinder parts, respectively. the lower connecting member and the upper and lower connecting members together is formed of a hard plastic or the like, on the outer peripheral surface of the insertion portion into each of the tubular portion, characterized that you have been retaining formation.

The outer peripheral surface of the cylindrical portion of the joint pipe main body, the outer surface of the spiral groove, and the outer surface of the reinforcing member are positioned within substantially the same circumferential surface, and the cylindrical portion, the spiral groove, and the reinforcing member It is desirable that a cover cylinder is inserted so as to cover the outer surface, and the lower connecting member and the upper connecting member made of a cylindrical socket are respectively inserted into the main body portion of the joint pipe main body and the outer periphery of the main body portion. It is preferable to fasten and fix from the surface with a fastening band.

  According to the connecting method and the connecting structure of the branch pipe to the underground main pipe of the present invention, the joint pipe has a cylindrical shape, and a spiral groove is formed on the outer peripheral surface in a bellows shape, so that the joint pipe has flexibility. A main body, a lower connecting member connected to the mounting pipe main body, an upper connecting member connected to the branch pipe, and a coil spring-like reinforcement disposed on the outer peripheral side of the joint pipe main body so as to be fitted into the spiral groove Since it is composed of a member and a cover cylinder arranged so as to cover the outer periphery of the reinforcing member, it has a three-layer structure. The movement in the direction can be reliably absorbed.

  The filler used in the connection method is mainly made of clay cement, usually mixed with cement and fiber binder, and kneaded with water, so it has flexibility, wrinkles, cracks, etc. in the seal part. It does not occur and is a natural material that does not liquefy and does not contain harmful substances, so there is no risk of contaminating groundwater, and filling can be done with a normal press-fitting machine. Moreover, since the filling of the filler is performed in a state where the propulsion pipe is pulled up to the vicinity of the upper end of the joint pipe, the vibration of the propulsion pipe does not affect the seal portion, and wrinkles, cracks, etc. do not occur. .

  The drawings show an embodiment of the method of connecting the branch pipe 12 to the underground main pipe 11 according to the present invention and the connection structure 1 thereof. FIG. 1 shows the connection of the branch pipe 12 to the underground main pipe 11 through the joint pipe 2. FIG. 2 is a partially sectional front view showing the configuration of the joint pipe 2, and FIG. 3 is an exploded view showing the constituent members of the joint pipe 2 as well. FIG. ing.

  The underground main pipe 11 and the branch pipe 12 are connected by a non-cutting method, and a propulsion pipe (not shown) is built from the ground toward the underground main pipe 11 by a well-known method and the propulsion is performed. A connecting hole 11a is opened in the underground main pipe 11 with an auger (not shown) lowered in the propelling pipe in a state where the pipe has reached the underground main pipe 11, and after the auger is pulled up, a joint pipe is attached to the tip portion. 2 is inserted using the propulsion pipe as a guide, and the tip of the joint pipe 2 is connected to the connection hole 11a via the attachment pipe body 3, and the connection portion is filled with a filler 13 to be described later. It is a connection method and a connection structure for sealing.

  The present applicant also proposed the non-cutting method using the propulsion pipe as described above and the connection method between the joint pipe tip and the connection hole 11a of the underground main pipe 11 (Japanese Patent Laid-Open No. 6-65958 and No. 2000-282557) In practice, the conventional method and its members can be used as they are.

  The connection structure 1 is composed of the joint pipe 2 and the attachment pipe main body 3, and the attachment pipe main body 3 is inserted into the connection hole 11 a and the gap with the connection hole 11 a is sealed with the filler 13. . The joint pipe 2 is formed of an elastic material such as rubber, and has a joint pipe body 4 in which a spiral groove 4a is formed in an accordion shape on an outer peripheral surface, and is disposed below the joint pipe body 4 and connected to the mounting pipe body 3. The lower connecting member 5 and the upper connecting member 6 arranged on the upper part and connected to the branch pipe 12, the coil spring-like reinforcing member 7 arranged to be fitted to the spiral groove 4a, and the reinforcing member 7 And a cover cylinder 8 made of an elastic material such as rubber arranged so as to cover the outer periphery, so that the joint pipe 2 has a seismic isolation function.

  Specifically, the joint pipe body 4 is formed in a cylindrical shape with an elastic material such as rubber, and the cylindrical portions 4b and 4c are formed in the lower portion and the upper portion. The lower connecting member 5 and the upper and lower connecting members 6 to be inserted into the cylindrical portions 4b and 4c are formed of hard plastic or the like, and a retaining jaw (or groove) is formed on the outer peripheral surface of each of the connecting portions of both connecting members. ) 5a and 6a are formed. As shown in FIGS. 2 and 3, the upper portion of the upper connecting member 6 is inserted into a connecting pipe 9 having an abutment rib 9 a on the inner surface, and the branch pipe 12 is connected through the connecting pipe 9. It has become so.

  The cylindrical portions 4b and 4c at positions corresponding to the retaining jaws 5a and 6a are fastened and fixed from the outer periphery by double fastening bands 10 and 10, respectively, so that the retaining is more reliable.

  As connection attachment means for attaching the attachment tube main body 3 to the attachment hole 11a, the means described in Japanese Patent Application Laid-Open No. 2000-282557 previously proposed by the present applicant can be employed as it is. For example, as shown in FIG. 4, the mounting pipe main body 3 is formed of thermoplastic inner and outer double cylinders 3a and 3b and a flange 13 formed at the tip of the outer cylinder 3a is formed on the surface of the underground main pipe 11. On the other hand, the tip of the inner cylinder 3b is inserted into the mounting hole 11a, and the tip of the inner cylinder 3b is softened with a warm air heater (not shown) lowered in the propelling pipe in this state, Next, an expansion device (not shown) with a balloon body attached to the tip is lowered from the propelling tube in a state where the balloon body is deflated, and the balloon body is inflated and softened by pumping air. A clamping flange 14 is formed by expanding the distal end portion of the inner cylinder 3b outward, and the clamping flange 14 and the flange 13 are attached so that the thickness of the underground main pipe 11 is clamped. Flange 13 and clamping In this method, the gap between the working flange 14 and the mounting hole 11a is sealed.

  In the above, a known clay cement is used as a main material, and a normal cement and a known fiber binder are mixed and kneaded with water, and the seal portion is made viscous by using the clay cement and the fiber binder. In addition, there is no risk of cracking and the like, and there is no risk of liquefaction, and since clay cement is a natural material that does not contain harmful substances, there is no risk of environmental pollution such as contamination of groundwater. At the time of construction, it can be filled with a normal press-fitting machine.

  Conventionally, the filling has been performed in a state where the propulsion pipe is in contact with the underground main pipe 11. However, by making the connection structure 1 the seismic isolation structure as described above, the propulsion pipe is isolated from the joint pipe. In a state where the function is not hindered, that is, in a state where it is pulled up to the vicinity of the upper end of the joint pipe, it is filled. Thereby, construction can be performed without applying unnecessary pressure to the seismic isolation joint pipe or hindering the flexibility of the joint pipe.

  FIG. 5 is a front view for explaining the seismic isolation function of the joint pipe when the branch pipe is connected to the underground main pipe by the connection method and the connection structure as described above, and (A) is the underground main pipe 11 and the branch pipe 12. Indicates a state of relative movement (stretching) in the vertical direction, (B) indicates a state in which the branch pipe 12 is tilted, and (C) indicates a state in which a lateral shift has occurred.

It is a front view which shows the state which connected the branch pipe to the underground main pipe through the joint pipe. It is a partial cross section front view which shows the structure of a joint pipe. It is an exploded view which shows the structural member of a joint pipe. It is sectional drawing of the principal part which shows the attachment structure of the attachment pipe main body to an underground main pipe. It is a front view explaining the seismic isolation function of a joint pipe, (A) shows the state where the underground main pipe and the branch pipe are relatively moved (stretched) in the vertical direction, and (B) is a movement that tilts the branch pipe. (C) shows a state in which a lateral shift has occurred.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Connection structure 2 Joint pipe 3 Mounting pipe main body 4 Joint pipe main body 5 Lower connection member 6 Upper connection member 7 Reinforcement member 8 Cover cylinder 9 Connection pipe 10 Tightening band 11 Underground pipe 12 Branch pipe 13 Flange 14 Clamping flange 2 Filling Material

Claims (4)

A propulsion pipe is built from the ground toward the underground main pipe and a connection hole is opened in the underground main pipe by an auger lowered in the propulsion pipe in a state where the propulsion pipe reaches the underground main pipe, After the auger is pulled up, a branch pipe with a joint pipe attached to the tip using the propulsion pipe as a guide is inserted, and the tip of the joint pipe and the connection hole are connected via a mounting pipe main body, and the connection is filled with a filler. In the connection method of the branch pipe to the underground main pipe sealed with
The joint pipe has a cylindrical shape, and a spiral groove is formed in an outer peripheral surface in a bellows shape, and has a flexible joint pipe main body, a lower connection member connected to the mounting pipe main body, and a connection to the branch pipe An upper connecting member, a coil spring-like reinforcing member arranged to be fitted in the spiral groove on the outer peripheral side of the joint pipe body, and a cover cylinder arranged to cover the outer periphery of the reinforcing member The joint pipe is configured as a seismic isolation joint, and the joint pipe main body is formed into a cylindrical shape with an elastic material such as rubber, and a cylindrical portion is formed at the lower and upper parts of the joint pipe main body. The lower connecting member and the upper and lower connecting members are inserted, and the lower connecting member and the upper and lower connecting members are formed of hard plastic or the like, and a stopper is formed on the outer peripheral surface of the inserting portion to each of the cylindrical portions. And
The filler is made of clay cement as a main material and usually mixed with cement and fiber binder and kneaded with water.
A connecting method characterized in that the filler is filled in a gap between the connection hole and the mounting pipe main body in a state where the propulsion pipe is pulled up to the vicinity of the upper end of the joint pipe. A propulsion pipe is built from the ground toward the underground main pipe and a connection hole is opened in the underground main pipe by an auger lowered in the propulsion pipe in a state where the propulsion pipe reaches the underground main pipe, After the auger is pulled up, a branch pipe with a joint pipe attached to the tip using the propulsion pipe as a guide is inserted, and the tip of the joint pipe and the connection hole are connected via a mounting pipe main body, and the connection is filled with a filler. In the connection structure of the branch pipe to the underground main pipe sealed with
The joint pipe has a cylindrical shape, and a spiral groove is formed in an outer peripheral surface in a bellows shape, and has a flexible joint pipe main body, a lower connection member connected to the mounting pipe main body, and a connection to the branch pipe An upper connecting member, a coil spring-like reinforcing member arranged by being fitted to the spiral groove on the outer peripheral side of the joint pipe main body, a cover tube arranged to cover the outer periphery of the reinforcing member, the joint tube have a seismic isolation function in configuration to,
The joint pipe body is formed in a cylindrical shape with an elastic material such as rubber, and cylindrical parts are formed at the lower and upper parts of the joint pipe body, and the lower connection member and the upper and lower connection members are inserted into the cylinder parts, respectively. connection structure wherein the lower connecting member and the upper and lower connecting members together is formed of a hard plastic or the like, on the outer peripheral surface of the insertion portion into the respective said tubular portions, characterized that you have been retaining formation. The outer peripheral surface of the cylindrical portion of the joint pipe main body, the outer surface of the spiral groove, and the outer surface of the reinforcing member are positioned within substantially the same circumferential surface, and the cylindrical portion, the spiral groove, and the reinforcing member The connection structure according to claim 2, wherein a cover tube is extrapolated so as to cover an outer surface .   4. The joint pipe main body according to claim 2, wherein the lower connection member and the upper connection member are respectively inserted and fastened and fixed with a fastening band from an outer peripheral surface. The described connection structure.

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