JP4128520B2 - Flexible joint structure - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION

  The present invention relates to a flexible joint structure that is disposed between, for example, a propulsion pipe that constitutes an underground pipeline and allows relative displacement of the propulsion pipe due to an earthquake, ground deformation, or the like.

Conventional technology

  Generally, underground pipes constructed by the propulsion method are constructed by press-fitting a plurality of propulsion pipes sequentially with a shield jack, but this type of underground pipe is a relative displacement of the propulsion pipe due to earthquakes or ground deformation. In general, a flexible joint structure is disposed between the propulsion pipe and the propulsion pipe.

As shown in FIG. 12, the flexible joint structure includes a front tube body 200, a rear tube body 201, and a mountain 202a facing inward, which is watertightly connected to the front tube body 200 and the rear tube body 201. A primary water-stop rubber ring 202, and a secondary water-stop rubber having a mountain 203a facing inward, which is watertightly connected to the front tube body 200 and the rear tube body 201 radially inward from the primary water-stop rubber ring 202. A ring 203 and a skin plate 204 covering the outer periphery between the front tube body 200 and the rear tube body 201 are provided (for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-137694 (second page, FIG. 2)

  In the flexible joint structure, a thrust receiving material and a shear prevention material (not shown) are attached to the front tube body and the secondary water stop rubber ring mounting part of the rear tube body before being attached to the propulsion pipe, and are attached to the propulsion pipe. After that, the shear preventing material and the thrust receiving material are removed, and the secondary waterproof rubber ring is fixed to the secondary waterproof rubber ring mounting site.

  In the flexible joint structure, the front tube body and the rear tube body are connected in a watertight manner by a water-stopping rubber ring having a mountain facing inward. Since it receives as force, there exists a problem that the durability of a water stop rubber ring is lacking.

  The flexible joint structure includes a primary water blocking rubber ring that is fixedly arranged and a secondary water blocking rubber ring that is attached after being attached to the propulsion pipe. There is a problem that attachment to a secondary pipe must be carried out in a narrow pipe, and much time and labor are required for attachment of the secondary waterproof rubber ring.

  The present invention has been made in consideration of the above points, and provides a flexible joint structure that improves the durability of the rubber ring and eliminates the need for attaching the rubber ring after being attached to the propulsion pipe. Objective.

  The flexible joint structure of the present invention includes one tubular body, the other tubular body, a rubber ring disposed between the one tubular body and the other tubular body and having a mountain facing outward, A skin plate that covers an outer periphery between the tube body and the other tube body, and a rubber ring support structure that is disposed radially inward from the rubber ring. The rubber ring support structure includes one tube body and the other tube body. A pulling member that connects the tubular bodies, and a thrust receiving member that connects the one tubular body and the other tubular body independently of the pulling members, and receives external force as compression by a mountain facing outward. The work efficiency can be improved by improving the durability of the ring and limiting the work in the propulsion pipe after being attached to the propulsion pipe to the work of removing the pulling member and the thrust receiving member.

  As described above, the joint structure according to the present invention has a configuration in which the rubber ring disposed between one tube body and the other tube body has a mountain facing the outside, and the mountain facing the outside of the rubber ring. Since the outer ring receives external force as compression, the durability of the rubber ring is improved, and the rubber ring support structure is arranged radially inside the rubber ring, which pulls the work in the propulsion pipe after it is attached to the propulsion pipe. The work efficiency can be improved by limiting to the work of removing the member and the thrust receiving member.

BEST MODE FOR CARRYING OUT THE INVENTION

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

  FIG. 1 is a cross-sectional view of the flexible joint structure according to the present invention, and FIG. 2 is a view showing the assembly of the flexible joint structure according to the present invention.

  As shown in FIG. 1, the flexible joint structure 1 according to the present invention is attached to a joint structure body 2, a pipe body 3 attached to one side of the joint structure body 2, and the other side of the joint structure body 2. And a tubular body 4. The tubular body 3 forms a composite pipe 5 of concrete and steel pipe by pouring concrete with a reinforcing bar, and the tubular body 4 forms a composite pipe 6 of concrete and steel pipe by pouring concrete with a reinforcing bar.

  As shown in FIGS. 1 to 4, the joint structure body 2 includes a rubber ring 7 disposed between one tubular body 3 and the other tubular body 4, and one tubular body 4 and the other tubular body 5. A skin plate 8 covering the outer periphery of the rubber ring, and a rubber ring support structure 9 disposed radially inward from the rubber ring 7.

  The rubber ring 7 has a center ring 10 and rubber rings 11.11 attached to both sides of the center ring 10. Each rubber ring 11 has a cylindrical shape having a mountain 11a facing outward as a whole.

  One side of the rubber ring 7 is watertightly fixed to the side wall 3a of the tube body 3 via a bolt, and the other side is fixed to the side wall 4a of the tube body 4 via a bolt.

  In the embodiment shown in FIG. 1, the rubber ring 7 has a structure having two rubber rings 11, but the rubber ring 7 has three or more rubber rings 7 even if it has a structure having one rubber ring 11. The structure which has the rubber ring 11 may be sufficient.

  As shown in FIGS. 2 to 4, the rubber ring support structure 9 includes a pulling member 12 that connects one tubular body 3 and the other tubular body 4, and one tubular body 3 and the other tubular body 4. It has a thrust receiving member 13 to be connected, and a shear preventing member 14 for connecting one tube body 3 and the other tube body 4. The pulling member 12 and the thrust receiving member 14 are arranged at regular intervals in the circumferential direction within the same radial plane.

  As shown in FIG. 3, the pulling member 12 includes a hook 15 a that is engaged with a receiving portion 3 b that is provided radially inward of the rubber ring 7 of the side wall 3 a of one tube body 3, and the side wall of the other tube body 4. A hook 15b that is engaged with a receiving portion 4b provided radially inward of the rubber ring 7 of 4a, and an operating portion 16 that moves the hook 15a and the hook 15b in a direction in which they move toward and away from each other in one operation.

  That is, the pulling member 12 can pull the tubular body 3 and the tubular body 4 simultaneously in a direction approaching each other by rotating the operating portion 16 in one direction.

  As shown in FIG. 4, the thrust receiving member 13 is formed by a threaded rod, and one end of the threaded rod is connected to the side wall 3 a of the one tubular body 3, and the other end is the side wall of the other tubular body 4. 4a.

  The shear preventing member 14 is formed of a narrow iron plate piece, one end is connected to the inner peripheral side of one tube body 3, and the other end is connected to the inner peripheral side of the other tube body 4.

  The skin plate 8 is wound around the entire circumference of the joint structure main body 2 so as to cover the joint structure main body 2 and the pipe body 3 and a part of the pipe body 4, and intrusion of earth and sand from the outside into the joint structure main body 2. Acts to prevent.

  The flexible joint structure 1 is connected to the inner side in the radial direction from the rubber ring 7 of the pipe bodies 3 and 4 of the joint structure main body 22 by the pulling member 12 and the thrust receiving member 13 and prevents the inner peripheral side of the pipe bodies 3 and 4 from being sheared. It connects by the member 14, and it assembles by winding and fixing the skin plate 8 to the outer periphery of the joint structure main body 2 so that the outer surface of the pipe body 3 and the pipe body 4 may be covered.

  The assembled flexible joint structure 1 is transported to a fume pipe manufacturing factory (not shown), and in the fume pipe manufacturing factory, a rebar is poured into a pipe body 3 and concrete is poured into it, thereby forming a composite pipe 5 of concrete and steel pipe. The steel pipe 4 is filled with rebar and concrete is poured to form a composite pipe 6 of concrete and steel pipe.

  Next, a method for attaching the flexible joint structure 1 of the present invention to the propulsion pipe will be described with reference to FIGS.

  First, as shown in FIG. 5, a vertical pipe 20 is excavated in order to install an underground pipe, and a propelling pipe 21 for configuring the underground pipe is arranged in the excavated vertical pipe 20. The propulsion pipe 21 arranged in the vertical resistance 20 is moved leftward in FIG. 5 by the propulsion jack 22 (FIG. 6) and is press-fitted into the underground 23 in contact with the vertical resistance 20.

  Next, the flexible joint structure 1 is disposed in the longitudinal resistance 20 so as to follow the rear end 21a of the preceding propulsion pipe 21 press-fitted into the ground 23. The position of the flexible joint structure 1 disposed in the longitudinal member 20 is adjusted so that the composite pipe 5 located on the distal end side is located on the same axis as the preceding propelling pipe 21.

  Next, as shown in FIG. 6, the flexible joint structure 1 is moved in the direction of the leading propulsion pipe 21 by the propulsion jack 22, and the composite pipe 5 of the flexible joint structure 1 is moved to the rear end portion of the leading propulsion pipe 21. Press fit into 21a. Thereby, the advance propulsion pipe 21 and the flexible joint structure 1 are connected in a watertight manner.

When the press fitting of the flexible joint structure 1 to the preceding propulsion pipe 21 is completed, as shown in FIG.
A trailing propulsion pipe 24 is arranged in the longitudinal 20 so as to follow the flexible joint structure 1. The trailing propulsion pipe 24 is disposed so as to be positioned coaxially with the composite pipe 6 located on the rear end side of the flexible joint structure 1. The trailing propulsion pipe 24 is moved in the direction of the flexible joint structure 1 by the propulsion jack 22 so that the front end 24 a is press-fitted into the composite pipe 6 of the flexible joint structure 1. As a result, the trailing propulsion pipe 24 and the flexible joint structure 1 are connected in a watertight manner via the flexible joint structure 1.

  When the watertight connection between the preceding propulsion pipe 21 and the subsequent propulsion pipe 24 is completed, an operator enters the inner space of the flexible joint structure 1 from the rear propulsion pipe 24 side, and the flexible joint structure shown in FIGS. 1 pulling member 12, thrust receiving member 13 and shear preventing member 14 are removed from flexible joint structure 1. As a result, the flexible joint structure 1 is attached between the preceding propulsion pipe 21 and the subsequent propulsion pipe 24 as shown in FIG.

  In the flexible joint structure 1, the composite pipe 5 and the composite pipe 6 are coupled by the thrust receiving member 13 and the shear preventing member 14 at the stage where the preceding propulsion pipe 21 and the subsequent propulsion pipe 24 are press-fitted. The thrust receiving member 13 receives thrust at the time of propulsion to 21 and 24 and can maintain the distance between the composite pipe 5 and the composite pipe 6. Further, the thrust pipes 21 and 24 are driven by the thrust receiving member 13 and the shear preventing member 14. It is possible to prevent meandering and rotation of the propulsion pipes 21 and 24 at the time of press fitting.

  In use, a plurality of propulsion pipes in which the adjacent propulsion pipes 21 and 24 are connected by the flexible joint structure 1 are buried in the ground so as to constitute an underground pipe line.

  When an earthquake or ground change occurs in an area where a plurality of propulsion pipes are embedded, the adjacent propulsion pipes 21 and 24 are eccentric from each other as shown in FIG. Although it is displaced to a position shifted by the amount E, the eccentric amount E is absorbed so that the flexible joint structure 1 interposed between the adjacent propulsion tubes 21 and 24 allows the relative displacement of the adjacent propulsion tubes 21 and 24. Therefore, the adjacent propulsion pipes 21 and 24 are not damaged even if their axes are displaced by an eccentric amount E.

  In the said embodiment, although the flexible joint structure 1 was used for the propulsion pipe which comprises an underground pipe line, and the other example was demonstrated, the flexible joint structure 1 is sewer, agricultural water supply, water supply, electric power, gas, communication, etc. It can also be used for other pipelines.

  The flexible joint structure 1 of the present invention can also be used to absorb displacement and stress at the boundary of the strata, suddenly changing ground, soft ground, rivers, canals, overhanging parts such as roads, mating parts with structures, etc. it can.

  FIG. 10 shows another embodiment of the flexible joint structure according to the present invention. In the embodiment shown in FIG. 10, the flexible joint device 100 connects two flexible joint structures 101 and 102 with a pipe body 103, attaches a pipe body 104 to one flexible joint structure 101, and connects the other flexible joint structure 101. A pipe 105 is attached to the flexible joint structure 102, a rebar is inserted into the pipe 104 and concrete is poured into the composite pipe 106, and a composite pipe 107 is formed by pouring the rebar into the pipe 105 and pouring the concrete. Consists of.

  In use, a plurality of propulsion pipes in which the adjacent propulsion pipes 21 and 24 are connected by the flexible joint device 100 are buried in the ground so as to constitute an underground pipe line.

  When an earthquake or ground deformation occurs in an area where a plurality of propulsion pipes are embedded, the adjacent propulsion pipes 21 and 24 are eccentric from each other as shown in FIG. Although displaced to a position shifted by the amount E1, the two flexible joint structures 101 and 102 of the flexible joint device 100 interposed between the adjacent propulsion pipes 21 and 24 are expanded and contracted to be adjacent to each other by bending deformation. Since the eccentric amount is absorbed so as to allow the relative displacement of the propulsion pipes 21 and 24, the adjacent propulsion pipes 21 and 24 are not damaged even if their axes are displaced by the eccentric amount E1.

It is a sectional view of one embodiment of the flexible joint structure concerning the present invention. It is a figure which shows the assembly state of the flexible joint structure which concerns on this invention. It is a figure which shows arrangement | positioning of the tension member of the flexible joint structure which concerns on this invention. It is a figure which shows arrangement | positioning of the thrust receiving member of the flexible joint structure which concerns on this invention. It is a figure which shows the state before the press injection of the advance propelling pipe of the flexible joint structure which concerns on this invention. It is a figure which shows the state after the press injection of the advance propelling pipe of the flexible joint structure which concerns on this invention. It is a figure which shows the state by which the following propulsion pipe | tube of the flexible joint structure which concerns on this invention was press-fit. It is a figure which shows the attachment state of the propulsion pipe of the flexible joint structure which concerns on this invention. It is a figure which shows the effect | action of the propulsion pipe incorporating the flexible joint structure which concerns on this invention. It is a figure which shows other embodiment of the flexible joint structure which concerns on this invention. It is a figure which shows the effect | action of the propulsion pipe incorporating the flexible joint apparatus shown in FIG. It is a figure which shows the conventional flexible joint structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flexible joint structure 2 Joint structure main body 3 Tubing body 4 Tubing body 5 Synthetic steel pipe 6 Synthetic steel pipe 7 Rubber ring 8 Skin plate 9 Rubber ring support structure 12 Pull member 13 Thrust receiving member 14 Shear prevention member

Claims (3)

One tubular body, the other tubular body, a rubber ring having a mountain facing outward and disposed between the one tubular body and the other tubular body, and between the one tubular body and the other tubular body. A skin plate that covers the outer periphery of the rubber ring, and a rubber ring support structure disposed radially inside the rubber ring,
The rubber ring support structure is
A pulling member for connecting one tube body and the other tube body and pulling one tube body and the other tube body toward each other ;
When one tube body and the other tube body are connected independently of the pulling member and thrust is applied to the one tube body and the other tube body, the one tube body and the other tube body are subjected to thrust. receiving thrust for the possess a member,
The pulling member is located between a receiving portion provided on the side wall of one tubular body and a receiving portion provided on the side wall of the other tubular body, and contacts and separates the one tubular body and the other tubular body from each other in one operation. Has an operating part to move to
The thrust receiving member has a rod connected between a side wall of one pipe body and a side wall of the other pipe body,
The pulling member and the thrust receiving member are used in the construction of the propulsion method, and are removed after one tube body and the other tube body are constructed by the propulsion method. <Br / > A flexible joint structure characterized by that.   The flexible joint structure according to claim 1, wherein the pulling member and the thrust receiving member are arranged at regular intervals in the circumferential direction.   3. The flexible joint structure according to claim 1, further comprising a shear preventing member that connects one tube body and the other tube body.

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