JP6300161B2 - Seismic detachment prevention joint for curved pipe section and underground pipe using the same - Google Patents

Description

  The present invention is a joint for connecting pipes constituting underground pipes such as agricultural waterways, and in particular, pipes constituting straight lines and pipes constituting curved parts and curved parts. The present invention relates to a seismic detachment preventing joint for a curved portion of a pipe connecting the body and an underground pipe using the same.

  Conventionally, underground conduits used for agricultural waterways and the like are provided with curved portions that are bent in alignment with topography and ground structures, and such curved portions are connected between straight pipes. It is configured by connecting curved pipes and laying curves while tilting each other.

  A so-called thrust force acts outwardly in the bending radius direction due to the fluid pressure in the pipe line, and the pipe bodies constituting the curve part may be separated or vibrated by the thrust force. Therefore, the joint that connects between the curved pipe and the straight pipe constituting the curved portion is normally used with a structure that is restricted in movement in the direction of separation from each other and can resist thrust force (for example, , See Patent Document 1).

  The method of constructing a curved part by connecting a plurality of pipes while inclining each other is that if the curvature radius of the curved part is small, the force in the separating direction acting between the pipes is increased by the thrust force. It is applied only to the gently curved part where the thrust force can be suppressed by the resistance of.

  In addition, the curved portion of the underground pipeline is held by the back soil in the radial direction of curvature, and the reaction force of the thrust force acts on the straight portion of the underground pipeline connected to the curved portion. Even in the straight line portion, it is necessary to provide a portion having a certain length in which movement in the separation direction is restricted so as to be able to counter the reaction force of the thrust force.

  Furthermore, in order to counteract this kind of thrust force, for example, after excavating the ground on the curved portion, a curved pipe constituting the curved portion is installed, and a fixing member such as a thrust block or geocentics is used. A structure for fixing the curved portion is also known (see, for example, Patent Document 2).

  On the other hand, in underground conduits, when seismic motion occurs, seismic structure joints that allow the pipes to be connected to each other while allowing for certain expansion and contraction, and to connect the pipes in a non-detachable manner. It is desired that the displacement of the ground be absorbed by expansion and contraction of each joint that connects the pipes while preventing the pipes from being separated.

JP 2002-048276 A JP 2002-276853 A

  However, in the conventional technique such as Patent Document 1 described above, since the joint that connects the curved pipe and the straight pipe constituting the curved portion is in a state in which movement in the detachment direction is restricted from each other, it cannot cope with the earthquake resistant structure. When a force in the direction of the pipe axis acts on the curved portion due to seismic motion or the like, there is a possibility that the displacement cannot be absorbed and the joint is damaged.

  On the other hand, the above-mentioned conventional anti-separation joints for earthquake-resistant structures are designed to allow a certain amount of expansion and contraction when applied to the connection between the pipes constituting the curved portion, and thus cannot resist the thrust force. In particular, if the radius of curvature of the curved portion is small, the area of the back soil becomes small, and accordingly, there is a problem that a means for countering the thrust force is required.

  Also, in underground pipes that use a lot of curved parts, it is not possible to secure a sufficient length to obtain the ground resistance necessary to counter the thrust force described above on the straight parts connected to the curved parts. In some cases, it was not possible to apply a seismic-resistant joint for prevention between pipes constituting the part.

  Further, in order to provide a fixing member such as a thrust block as in the prior art, at least the earth and sand on the curved portion must be excavated and a fixing member such as a thrust block must be installed and then backfilled, which makes the work complicated. The efficiency is low, and there is a problem that it cannot be applied when there is a structure on the ground.

  In particular, when the pipe body constituting the underground conduit is buried by the propulsion method, since the earth covering is generally deep, there is a problem that the construction period becomes longer due to the installation of a thrust block and the cost increases.

  Therefore, in view of such a conventional problem, the present invention is capable of resisting a thrust force in a normal state, exhibiting seismic performance when an earthquake motion occurs, and an easy-to-install pipe curve part separation preventing joint and an underground using the same. It was made for the purpose of providing pipelines.

  The feature of the invention according to claim 1 for solving the conventional problems as described above and achieving the intended purpose is an underground conduit having a curved portion in which each tubular body is curved. A cylindrical collar portion projecting to the other side from the end face of one tubular body connected to each other, an insertion portion disposed at the end portion of the other tubular body and inserted into the collar portion, and A water stop packing interposed in the gap between the inner peripheral surface and the outer peripheral surface of the insertion portion, a slip-out prevention convex portion protruding in a ring shape on the inner peripheral surface of the collar portion, and a distal end side outer peripheral portion of the insertion portion A plurality of stopper fitting portions that are circumferentially spaced apart from each other and each have a stopper fitting that is fitted in the stopper fitting portion so as to be movable in the radial direction. Remove the stopper bracket with the inserted It is a detachment prevention joint that protrudes from the outer peripheral surface of the insertion part in the insertion direction front side from the protrusion for preventing protrusion, and connects both the pipes in a non-detachable manner. Compared to the normal detachment resistance part that is arranged, it is equipped with a strong detachment resistance part that protrudes a lot of stopper fittings from the outer peripheral surface of the insertion part, and the strong detachment resistance part is provided between the curved pipes. A conduit curve portion that is arranged on the center side of the laying radius, abuts the end face of the pipe body on the center side of the laying radius, and engages the stopper metal fitting on the outer side of the laying radius and the protrusion for preventing withdrawal. For anti-seismic joints.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the high-strength detachment resistance portion has a smaller circumferential pitch between the stopper fitting portions than the normal detachment resistance portion. The reason is that many stopper fitting portions are provided.

  According to a third aspect of the present invention, in addition to the configuration of the first aspect, the insertion portion is provided with the stopper fitting portions at equal intervals in the circumferential direction. The metal fitting is protruded from the outer peripheral surface of the insertion portion, and the stopper metal fitting is protruded intermittently at the normal separation resistance portion.

  According to a fourth aspect of the present invention, in addition to the structure of any one of the first to third aspects, the stopper fitting portion includes an anchor nut having an internal thread on an inner peripheral surface portion thereof. The male screw formed on the outer periphery is screwed onto the anchor nut.

  According to a fifth aspect of the present invention, in the underground conduit having a curved portion formed by laying a plurality of curved portion tubular bodies, the protruding portion projects from the end face of one of the tubular bodies connected to each other to the other side. A cylindrical collar portion, an insertion portion that is disposed at the end of the other tubular body and is inserted into the collar portion, and a gap between an inner peripheral surface of the collar portion and an outer peripheral surface of the insertion portion. A water stop packing, a slip-out preventing convex portion projecting in a ring shape on the inner peripheral surface of the collar portion, and a plurality of stoppers that are radially spaced from each other at the distal end side outer peripheral portion of the insertion portion. Compared with a normal detachment resistance portion provided with a fitting portion and a stopper fitting fitted to the stopper fitting portion so as to be movable in the radial direction, and disposed at other portions in the circumferential direction of the insertion portion , Stopper gold from the outer peripheral surface of the insertion part Using a seismic detachment prevention joint for curved pipe sections with a strong detachment resistance part that protrudes a lot, the strong detachment resistance part is placed on the center side of the laying radius between the pipes where the curve is laid And the insertion portion is inserted into the collar portion so that the tube end face is abutted on the center side of the installation radius, and in this state, the stopper fitting protrudes from the outer periphery of the insertion portion, and the installation radius In the underground conduit, the stopper metal fitting on the outer peripheral side and the protrusion for preventing withdrawal are engaged.

  According to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect, the linear portion adjacent to the curved portion protrudes to the other side from the end face of one of the straight portion tubular bodies connected to each other. A cylindrical straight portion collar portion, a straight portion insertion portion that is disposed in the end portion of the other straight portion tubular body and is inserted into the straight portion collar portion, and an inner periphery of the straight portion collar portion A straight portion water-stopping packing interposed in a gap between the surface and the outer peripheral surface of the straight portion insertion portion, and a straight portion slip-out preventing convex portion protruding in a ring shape on the inner peripheral surface of the collar portion, In the insertion portion for the straight portion, the stopper fitting for the straight portion is moved to each of a plurality of stopper fitting portions for seismic detachment resistance arranged radially at a desired circumferential pitch on the outer peripheral portion on the distal end side in the insertion direction. An anti-seismic detachment resistance portion that is fitted together, and the proof resistance The straight part stopper metal fittings are movably fitted to a plurality of thrust resistance stopper fitting parts arranged in the radial direction at a desired circumferential pitch with a distance in front of the separation resistance part in the insertion direction. A thrust resistor portion, and the straight portion insertion portion is inserted into the straight portion collar portion, the straight portion stopper metal fittings are projected from the outer peripheral surface of the straight portion insertion portion, and the thrust resistance portion When the straight-line stopper metal fitting is engaged with the straight-line pull-out prevention convex part and a force of a certain level or more is applied between the two straight-tube parts, the straight metal stopper metal of the thrust resistance part is damaged. In addition, the straight part slip-out preventing convex part is provided with a straight part seismic detachment preventing joint capable of moving to the seismic detachment resistance part side.

  As described above, the joint for preventing seismic detachment for curved pipe sections according to the present invention is an underground pipe having a curved section in which each pipe is installed in a curved line. A cylindrical collar portion protruding to the other side from the end surface, an insertion portion disposed at the end portion of the other tubular body and inserted into the collar portion, an inner peripheral surface of the collar portion, and an outer peripheral surface of the insertion portion A water-stopping packing interposed in the gap, a slip-out preventing convex portion protruding in a ring shape on the inner peripheral surface of the collar portion, and a radius spaced from each other in the circumferential direction on the outer peripheral portion on the distal end side of the insertion portion. A plurality of stopper fitting portions oriented in the direction, and stopper fittings fitted to the stopper fitting portions so as to be movable in the radial direction, and the stopper fittings being inserted into the collar portion. Inserted from the protrusion It is a detachment prevention joint that protrudes from the outer peripheral surface of the insertion portion in front of the insertion direction, and connects the two pipe bodies in a non-detachable manner, and the insertion portion has a normal detachment resistance portion arranged in another portion in the circumferential direction Compared to the above, it is provided with a strong strength detachment resistance portion that protrudes a lot of stopper fittings from the outer peripheral surface of the insertion portion, and the strong strength detachment resistance portion is arranged on the center side of the laying radius between the curved pipes. The pipe body end face is abutted on the center side of the laying radius, and the stopper fitting on the outer side of the laying radius is engaged with the protrusions for preventing the slipping out, thereby providing a sharply curved curve laying. However, in normal times, the expansion and contraction of the joint that connects the pipes that make up the curved part is restricted by the shear resistance of the stopper fitting that normally makes up the detachment resisting part to counteract the thrust force. When acting, the stopper fitting that normally constitutes the detachment resistance portion can break and absorb a certain displacement, and the stopper fitting that constitutes the strong detachment resistance portion engages with the slip-out prevention convex portion, and the remaining stopper A high connection strength can be maintained by resisting external forces due to seismic motion or the like due to the shear strength of the metal fittings. In addition, after the end of the earthquake motion, the state against the thrust force can be restored by exchanging the stopper fitting constituting the fractured normal separation part.

  Further, in the present invention, the high-strength detachment resistance portion has a narrower circumferential pitch between the stopper fitting portions than the normal detachment resistance portion, and is provided with many stopper fitting portions. More stopper metal fittings than other parts in the circumferential direction can be protruded from the outer peripheral surface of the insertion part at the strength separation resistance part.

  Further, in the present invention, the insertion portion is provided with the stopper fitting portions at equal intervals in the circumferential direction, and in the high-strength detachment resistance portion, the stopper fittings are projected from the outer peripheral surface of the insertion portion, and the normal In the detachment resistance portion, the stopper metal fittings are allowed to protrude intermittently, so that the high strength detachment resistance portion can protrude more stopper metal fittings than the normal detachment resistance portion from the outer peripheral surface of the insertion portion, and When the stopper fitting of the normal separation resistance portion is damaged by an external force such as seismic motion, the state against the thrust force can be restored by projecting the unused stopper fitting.

  Furthermore, in the present invention, the stopper fitting portion includes an anchor nut having a female screw on an inner peripheral surface portion thereof, and a male screw formed on the outer periphery of the stopper fitting is screwed into the anchor nut. This makes it easy to install, and even if the stopper fitting that normally constitutes the detachment resistance portion is broken by an external force exceeding its shear resistance due to seismic motion, etc., the broken stopper fitting can be easily removed. Therefore, it can be replaced with a new stopper fitting, and the joint can be restored to a state capable of resisting the thrust force.

  Moreover, in the underground pipe line which concerns on this invention, in the underground pipe line which has a curved part formed by curving a plurality of pipes for curved parts, it protrudes in the other side from the end face of one pipe connected mutually. Interposed between the inner collar surface of the collar portion and the outer peripheral surface of the insertion portion, which is disposed at the end of the other tubular body and is inserted into the collar portion. A waterproof seal, a slip-out preventing projection protruding in a ring shape on the inner peripheral surface of the collar portion, and a plurality of radially-inwardly spaced outer circumferential portions on the distal end side of the insertion portion. Compared to a normal detachment resistance portion provided with a stopper fitting portion and a stopper fitting fitted to the stopper fitting portion so as to be movable in the radial direction, and disposed in other circumferential portions of the insertion portion From the outer peripheral surface of the insertion part Use a seismic detachment prevention joint for curved pipe sections that has a strong strength detachment resistance part that protrudes a lot of tools. And the insertion portion is inserted into the collar portion so that the tube end face is abutted on the center side of the installation radius, and in that state, the stopper fitting protrudes from the outer periphery of the insertion portion, By engaging the stopper metal fitting on the outer peripheral side of the radius and the protrusion for preventing slipping out, the curved portion can be laid in a sharp curve shape, and the tube constituting the curved portion is normally provided. The expansion and contraction of the joint portion that connects the bodies is restricted to resist thrust force, and when a large external force is applied due to seismic motion or the like, it is possible to provide an earthquake resistant structure that absorbs a certain displacement while maintaining the connection strength.

  Furthermore, in the present invention, a cylindrical linear portion collar portion that protrudes to the other side from the end face of one linear portion tubular body that is connected to each other in the linear portion adjacent to the curved portion, and the other straight line. A straight portion insertion portion that is disposed at an end portion of the tubular portion and is inserted into the straight portion collar portion; an inner peripheral surface of the straight portion collar portion; and an outer peripheral surface of the straight portion insertion portion. The straight portion water-stopping packing interposed in the gap and the straight portion slip-out preventing convex portion protruding in a ring shape on the inner peripheral surface of the collar portion, the straight portion insertion portion has a distal end in the insertion direction A seismic detachment resistance portion formed by movably fitting linear stopper metal fittings to a plurality of seismic detachment resistance stopper fitting portions arranged in a radial direction at a desired circumferential pitch with respect to each other, Before the seismic resistance part A thrust resistance portion formed by movably fitting a straight portion stopper fitting to a plurality of thrust resistance stopper fitting portions arranged at a distance in the radial direction at a desired circumferential pitch, The straight portion insertion portion is inserted into the straight portion collar portion, the straight portion stopper fittings are projected from the outer peripheral surface of the straight portion insertion portion, and the straight portion stopper fittings of the thrust resistance portion are connected to the straight portion. When a force of a certain level or more is applied between the straight tube parts, the straight stopper member for the thrust resistance part is damaged, and the straight part is prevented from coming out. By providing a straight part seismic detachment prevention joint that allows the convex part to move toward the seismic detachment resistance part side, the straight part adjacent to the curved part normally has a slur Can counteract the reaction force of the force, when the earthquake motion or the like occurs can be the entire pipe is forms a chain structure pipe, against the external force by the large-scale earthquake motion or the like in conjunction with each other.

It is a top view which shows an example of the underground pipe line which concerns on this invention. It is a partial expanded sectional view which shows the tubular body for curved parts in FIG. It is sectional drawing which shows the curve part detachment | leave prevention joint in FIG. It is the sectional view on the aa line in FIG. It is a partial expanded sectional view which shows the tubular body for linear parts in FIG. It is sectional drawing which shows the linear part detachment | leave prevention joint in FIG. (A) is the bb sectional view taken on the line in FIG. 6, (b) is the cc sectional view taken on the line. (A) is sectional drawing for demonstrating the initial stage behavior of the curve part detachment | desorption prevention joint when the external force by earthquake motion etc. acts, (b) is the sectional view on the aa line. (A) is sectional drawing which shows the state which the curve part detachment | desorption prevention joint same as the above extended most, (b) is the sectional view on the aa line. (A) is a partial expanded sectional view which shows the state of the earthquake resistant detachment prevention joint for linear parts at the normal time, (b) is a partial expanded sectional view which shows the state at the time of the seismic motion acting.

  Next, an embodiment of a seismic detachment preventing joint for a curved line portion according to the present invention and an underground conduit using the same will be described with reference to the drawings. In addition, the code | symbol A in a figure is an underground conduit used for agricultural waterways.

  In this embodiment, the insertion direction of the insertion portion to be described later with respect to the collar portion will be described as a reference, and the insertion direction front end side of the insertion portion will be the front.

  The underground pipe line A includes a curved portion formed by inclining a plurality of curved portion tubular bodies 1, 1 to each other, and a straight portion formed by linearly laying the straight portion tubular bodies 2, 2. The curved pipes 1 and 1 and the straight pipes 2 and 2 are buried in the ground by the propulsion method, and the curved pipes 1 and 1 constituting the curved part are seismic resistant for the pipe curved part. They are connected by a detachment prevention joint 3, and the curved portion tube body 1 and the straight portion tube body 2 and the straight portion tube bodies 2, 2 are connected by a straight portion seismic detachment prevention joint 4.

  As shown in FIG. 2, the curved portion tubular bodies 1 and 1 are propulsion pipes each made of a synthetic steel pipe, and have a structure in which a lining made of a concrete layer 6 is applied to the inner periphery of the outer shell steel pipe 5. . In addition, the tube part 1 for curved parts of a present Example is shorter than the tube part 2 for straight parts.

  In the figure, reference numerals 7 and 8 denote end plates disposed on the end face of the pipe body, and reference numerals 9 and 10 denote reinforcing plates that project from the inner peripheral face of the outer shell steel pipe 5 at intervals in the circumferential direction. It is a rib, and each end plate 7 and 8 is supported by the front-end | tip of the reinforcing ribs 9 and 10. FIG.

  As shown in FIG. 3 and FIG. 4, the seismic detachment preventing joint 3 for the pipe line curve section includes a cylindrical collar portion 11 protruding from the end face of one of the tubular bodies 1 to be connected to the other side, and the other tubular body. 1, an insertion portion 12 that is inserted into the collar portion 11, a still water packing 13 that is interposed in a gap between the inner peripheral surface of the collar portion 11 and the outer peripheral surface of the insertion portion 12, and the collar portion 11 and a plurality of stopper fitting portions 15, 15 that are radially spaced apart from each other in the circumferential direction on the distal end side outer peripheral portion of the insertion portion 12. ... and stopper fittings 16a to 16m fitted to the stopper fitting portions 15, 15 ... so as to be movable in the radial direction, and the stopper fitting 16a with the insertion portion 12 inserted into the collar portion 11 ~ 16m It is projected from the insertion portion 12 the outer peripheral surface at and inclusive forwardly, so as to undetachable connecting pipe members 1,1.

  Moreover, the seismic detachment prevention joint 3 for the curved line portion is provided with stopper metal fittings 16g to 16m on the outer peripheral surface of the insertion portion 12 as compared with other portions in the circumferential direction of the insertion portion 12 (hereinafter referred to as normal separation resistance portion 17). A strong-strength detachment resistance portion 18 that protrudes a lot from the pipe, and the strong-strength detachment resistance portion 18 is disposed on the laying radius center side between the curved pipes, and the tube end face is butted against the laying radius center side. The stopper fittings 16c, 16d on the outer peripheral side of the laying radius are engaged with the slip-out preventing convex portion 14.

  The collar portion 11 is formed by a steel pipe extending from the rear end of the outer shell steel pipe 5, and integrally protrudes from the end face of the tubular body 1 toward the other side (rear).

  On the inner peripheral surface of the collar portion 11, a slip-out preventing convex portion 14 protruding in a ring shape is provided on the rear end side, and an annular water-stop packing 13 is fitted on the rear end side.

  Further, a stopper member 19 made of a round bar for preventing packing removal is fixed to the inner peripheral surface of the rear end of the collar portion 11, and the outer peripheral surface of the water-stop packing 13 is fixed to the inner peripheral surface of the collar portion 11. The water-stopping packing 13 is prevented from coming out of the collar portion 11 by being stopped by the stopper member 19.

  The pull-out prevention convex portion 14 is formed in a ring shape by a metal member such as steel, and the outer periphery thereof is firmly fixed to the inner peripheral surface of the collar portion 11 by welding or the like over the entire circumference.

  Although the aspect of the water-stopping packing 13 is not particularly limited, for example, a structure that is integrally formed into a shape having a plurality of curved portions 13 a, 13 a... Whose inner peripheral side is inclined in the insertion direction of the insertion portion 12 is used. To do.

  The insertion portion 12 has an insertion portion outer shell 20 obtained by reducing the diameter of the end portion of the outer shell steel pipe 5, and has an inner peripheral surface lined with the concrete layer 6 described above.

  The insertion portion 12 includes a plurality of stopper fitting portions 15, 15... At the distal end side outer peripheral portion and spaced apart from each other in the circumferential direction, respectively, and each stopper fitting portion 15, 15. .. is radial.

  Each of the stopper fitting portions 15, 15... Is inserted into a hole formed in the insertion portion outer shell 20 at the tip of the anchor nut 21 and welded to the insertion portion outer shell 20 and the reinforcing rib 10. It is formed by embedding in the layer 6.

  Further, stopper fittings 16 a to 16 m are fitted to the stopper fitting portions 15, 15... So as to be movable in the radial direction, and the stopper fittings 16 a to 16 m protrude outward from the outer peripheral surface of the insertion portion 12. It is supposed to be.

  The stopper fittings 16 a to 16 m are formed in a cylindrical shape having a small diameter portion 22 at the tip, and a male screw 23 is engraved on the outer peripheral surface excluding the small diameter portion 22 at the tip, and the male screw 23 is a female screw of the anchor nut 21. Are fitted into the stopper fitting portions 15, 15...

  At the rear ends of the stopper fittings 16a to 16m, a wrench hole 24 made of a hexagonal wrench, for example, a hexagonal wrench is formed. By fitting and rotating the square wrench into the wrench hole 24 from within the pipe, The stopper fittings 16a to 16m are screwed in the stopper fitting portions 15, 15... And can move in the radial direction.

  The stopper fittings 16a to 16m are formed such that the entire length, that is, the length from the tip to the end face where the wrench hole 24 is opened is shorter than the thickness of the concrete layer 6 of the insertion portion 12, and is accommodated in the anchor nut 21. The tip portion protrudes from the outer periphery of the insertion portion 12 by the operation.

  As shown in FIG. 3, the high-strength detachment resistance portion 18 has a narrower circumferential pitch between the stopper fitting portions 15 and 15 than the normal detachment resistance portion 17 (set to 1/2 in this embodiment). The number of the stopper fitting portions 15, 15... Is larger than that of the normal detachment resistance portion 17 (doubled in this embodiment), and the stopper fittings 16 g to 16 m are provided more than the normal detachment resistance portion 17.

  As shown in FIG. 5, the straight portion tubular body 2 is a propulsion pipe made of a synthetic steel pipe, and has a structure in which a lining made of a concrete layer 31 is applied to the inner periphery of the outer shell steel pipe 30.

  In the figure, reference numerals 32 and 33 denote end plates disposed on the end face of the tubular body, and reference numerals 34 and 35 denote reinforcing plates that project from the inner peripheral face of the outer shell steel pipe 30 at intervals in the circumferential direction. It is a rib and each end plate 32 and 33 is supported by the tip of reinforcing ribs 34 and 35. Reference numeral 52 in the drawing denotes an end cushion material interposed between the end plates 32 and 33.

  As shown in FIGS. 6 and 7, the straight part seismic detachment preventing joint 4 that connects the straight part pipes 2 and 2 projects to the other side from the end face of one of the straight part pipes 2 to be connected. A cylindrical straight portion collar portion 36, a straight portion insertion portion 37 that is disposed at the end of the other straight portion tubular body 2 and is inserted into the straight portion collar portion 36, and a straight portion collar. The straight portion water blocking packing 38 interposed in the gap between the inner peripheral surface of the portion 36 and the outer peripheral surface of the straight portion insertion portion 37, and the straight portion protruding in a ring shape on the inner peripheral surface of the straight portion collar portion 36 A straight line is connected to each of a plurality of stopper fitting portions 40, 40,... For seismic detachment resistance directed radially at a desired circumferential pitch on the distal end side outer peripheral portion of the straight portion insertion portion 37. Seismic detachment resistance portion 42 formed by movably fitting the stopper metal fittings 41, 41. , Arranged at a distance from the front side in the insertion direction of the seismic detachment resistance portion 42 and linearly connected to a plurality of thrust resistance stopper fitting portions 43, 43... In the radial direction at a desired circumferential pitch. And a thrust resistance portion 45 in which the stopper brackets 44, 44... Are movably fitted. The straight portion insertion portion 37 is inserted into the straight portion collar portion 36, and the straight portion insertion portion is inserted in this state. .. Are protruded from the outer peripheral surface of the portion 37, and the straight portion stopper fittings 44, 44... Of the thrust resistance portion 45 are pulled out for the straight portion. The prevention convex part 39 is engaged.

  The straight portion collar portion 36 is formed by a steel pipe extending from the rear end of the outer shell steel pipe 30, and integrally protrudes from the end face of the straight portion tubular body 2 toward the other side (rear side).

  On the inner peripheral surface of the straight portion collar portion 36, a straight portion slip-out preventing convex portion 39 protruding in a ring shape is provided on the rear end side, and an annular straight portion water-stop packing 38 is further provided on the rear end side. It is mated.

  Further, a stopper member 46 made of a round bar for preventing packing separation is fixed to the inner peripheral surface of the rear end collar portion 36, and the outer peripheral surface of the linear portion water-stopping packing 38 is the linear portion collar. It is fixed to the inner peripheral surface of the portion 36 and is held against the stopper member 46 so that the straight portion water-stop packing 38 does not come out of the straight portion collar portion 36.

  The straight portion slip-out preventing convex portion 39 is formed in a ring shape by a metal member such as steel, and the outer periphery thereof is firmly fixed to the inner peripheral surface of the straight portion collar portion 36 by welding or the like over the entire circumference. .

  Although the aspect of the water-stop packing 38 for straight portions is not particularly limited, for example, it is integrally formed into a shape including a plurality of curved portions 38a, 38a whose inner peripheral side is inclined in the insertion direction of the straight portion insertion portion 37. Use things.

  The straight portion insertion portion 37 has a insertion portion outer shell 47 obtained by reducing the diameter of the end portion of the outer shell steel pipe 30, and has a structure in which the above-described concrete layer 31 is lined on the inner peripheral surface thereof.

  The straight portion insertion portion 37 has a plurality of stopper fitting portions 40, 40,... For seismic detachment resistance arranged radially at a desired circumferential pitch at the outer peripheral portion on the distal end side in the insertion direction. , And a plurality of thrust resistance stopper fitting portions 43, 43,..., Respectively, oriented in the radial direction at a desired circumferential pitch at the outer peripheral portion at a certain distance in the insertion direction from the seismic detachment resistance portion 42. ing.

  The thrust resistance stopper fitting portions 43, 43... Are wider in circumferential pitch than the circumferential pitch of the earthquake resistant separation resistance stopper fitting portions 40, 40. Compared with the quantity of the straight part stopper fittings 41, 41 ..., the quantity of the straight part stopper fittings 44, 44 ... protruding from the outer peripheral surface of the straight part insertion part 37 in the thrust resistance part 45 is reduced. Yes.

  That is, the thrust resistance portion 45 can be obtained by reducing the number of straight-line stopper brackets 44, 44... In comparison with the earthquake-resistant separation resistance portion 42 in which sufficient resistance against external forces such as earthquake motion is ensured. Although it is possible to counter the thrust force acting between the pipe bodies 2 and 2, the linear portion stopper fittings 44, 44... Are broken against a large external force exceeding the thrust force.

  Each of the seismic detachment resistance stopper fitting portions 40, 40... And each of the thrust resistance stopper fitting portions 43, 43... Is inserted into a hole formed in the insertion portion outer shell 47 at the tip of the anchor nut 48. It is formed by being inserted and welded to the insertion portion outer shell 47 and the reinforcing rib 35 and embedded in the concrete layer 31.

  In addition, the stopper fittings 41, 44 for straight portions can be moved in the radial direction in the stopper fitting portions 40, 40 ... for the seismic detachment resistance and the stopper fitting portions 43, 43 ... for the thrust resistance, respectively. The straight part stopper fittings 41 and 44 protrude outward from the outer peripheral surface of the straight part insertion part 37.

  The straight portion stopper metal fittings 41 and 44 are both formed in a cylindrical shape having a small diameter portion 49 at the tip, and a male screw 50 is engraved on the outer peripheral surface excluding the small diameter portion 49 at the tip. Are fitted into the stopper fitting portion 40 for anti-seismic detachment resistance and the stopper fitting portion 43 for thrust resistance.

  A wrench hole 51 made of a hexagon socket for a straight wrench, for example, a hexagon wrench, is formed at the rear ends of the stopper brackets 41, 44 for the straight section, and the square wrench is fitted into the wrench hole 51 from within this pipe. Thus, the stopper fittings 41 and 44 for the straight portion are screwed in the stopper fitting portion 40 for seismic detachment resistance and the stopper fitting portion 43 for thrust resistance, and can move in the radial direction.

  The straight portion stopper fittings 41 and 44 are formed such that the entire length thereof, that is, the length from the tip to the end surface where the wrench hole 51 is opened is shorter than the thickness of the concrete layer 31 of the straight portion insertion portion 37. The tip portion is projected from the outer periphery of the straight portion insertion portion 37 by being operated while being accommodated in the nut 48.

  Next, aspects of the seismic detachment preventing joint 3 for a curved line portion and the detachment preventing joint 4 for a straight portion as in the underground conduit A according to the present invention will be described in detail.

  In the underground conduit A, the strong-strength detachment resistance portion 18 is inserted between the end plates 7 and 8 of both the curved portion pipes 1 and 1 while the insertion portion 12 is inserted into the collar portion 11 via the end face cushion material 25. Are arranged on the inner side to incline each other so as to form a desired laying radius, and the curved portion tubular bodies 1 and 1 are driven to construct the curved portion.

  Thus, by embedding each of the curved portion tubular bodies 1 and 1 in the ground, the tubular body end faces 2a and 2b are brought into contact with each other at the laying radius center side, and in this state, the stopper fittings 16a to 16m are moved to the respective ends. The tip is protruded until it is located outside the inner diameter of the escape prevention convex portion 14 of the collar portion 11, and the stopper fittings 16 c and 16 d on the outer side of the laying radius are engaged with the escape prevention convex portion 14. At that time, it can be confirmed that the stopper fittings 16a to 16m have a desired protruding length by protruding until the tips thereof are in contact with the inner peripheral surface of the collar portion 11.

  In a normal state, as shown in FIG. 1, the thrust force S acts on the curved portion pipes 1 and 1 on the outer side in the laying radial direction by the fluid pressure passing through the underground conduit A, and each curved portion pipe On the bodies 1 and 1, a component force of the thrust force S acts in the direction in which the outside of the installation radius is separated from the outside of the installation radius.

  As shown in FIGS. 3 and 4, the pipe-curved seismic detachment preventing joint 3 against the thrust force S has the end faces of the pipes 1 and 1 abutted on the center side of the laying radius, and a stopper on the outer side of the laying radius. Since the brackets 16c, 16d and the protrusion preventing projection 14 are engaged with each other, they are countered by the shear resistance of the stopper brackets 16c, 16d arranged outside the laying radius, that is, the normal separation resistance portion 17, and for the curved portion. The tubular bodies 1 and 1 or the curved section tubular bodies 1 and 1 and the straight section tubular bodies 2 and 2 are prevented from being separated from each other.

  At that time, the stopper fittings 16g to 16m arranged on the center side of the laying radius, that is, the stopper fittings 16g to 16m constituting the strong separation resistance portion 18 are separated from the protrusion preventing portion 14 in the tube axis direction. Although it is in a separated state and does not contribute as resistance to the thrust force S, the thrust force S is smaller than the external force due to seismic motion or the like and is a force acting in the laying radial direction. 17, that is, the thrust force S can be sufficiently resisted only by the shear strength of the stopper fittings 16c and 16d disposed outside the installation radius.

  In the seismic detachment preventing joint 3 for the curved line section, when a large external force is applied in a direction in which the pipes are separated from each other due to ground displacement or cracking due to earthquake motion, first, the stopper fittings 16c and 16d constituting the normal detachment resistance section 17 are firstly provided. The insertion portion 12 moves in the pull-out direction and absorbs the ground displacement while resisting the external force with the shear strength.

  However, since the stopper fittings 16c, 16d constituting the normal separation resistance portion 17 are in a state of being engaged with the protrusion preventing projection 14 from the beginning, the external force is applied to the stopper fittings 16c, 16d constituting the normal separation resistance portion 17. When the shear strength is exceeded, as shown in FIG. 8, the small diameter portion 22 at the tip of the stopper fittings 16c and 16d constituting the normal release resistance portion 17 is broken in order from the outside of the laying radius before the insertion portion 12 has completely moved in the removal direction. To do.

  When the stopper fittings 16c and 16d are broken, the insertion portion is made using the space between the stopper fittings 16b and 16e disposed on the center side of the laying radius of the broken stopper fittings 16c and 16d and the protrusion preventing projection 14. 12 moves in the withdrawal direction to absorb the displacement.

  Further, depending on the external force that acts, the space between the stopper fittings 16a, 16f and the pull-out preventing convex portion 14 disposed on the center side of the laying radius of the stopper fittings 16b, 16e broken by the breakage of the stopper fittings 16b, 16e. Using this, the insertion part 12 moves in the withdrawal direction to absorb the displacement.

  Then, when the insertion portion 12 further moves in the withdrawal direction, as shown in FIG. 9, the stopper fittings 16g to 16m constituting the high-strength detachment resistance portion 18 engage with the withdrawal prevention convex portion 14, and the remaining stopper fitting 16g. With a shear strength of ˜16 m, it resists external forces due to seismic motion and the like and prevents further insertion part 12 from coming out.

  At that time, since the strong-strength detachment resistance portion 18 includes a larger number of stopper metal parts 16g to 16m than the normal detachment resistance part 17, the external force is dispersed accordingly, so that the stopper metal parts 16a to 16a constituting the normal detachment resistance part 17 are provided. Even if a part or all of 16f is missing, the pipe curve portion seismic detachment preventing joint 3 always maintains a high pull-out resistance.

  On the other hand, this underground pipe A is provided with a straight part seismic detachment preventing joint 4 between the straight part pipes 2 and 2 constituting the straight part adjacent to the curved part of the underground pipe A. It is a road.

  As shown in FIG. 10 (a), the straight portion seismic detachment preventing joint 4 is usually provided with straight portion stopper fittings 41, 41... Since they are engaged, the straight portion collar portion 36 and the straight portion insertion portion 37 are immovable from each other, and the straight portion has a length that is necessary and sufficient to obtain a ground resistance against the thrust force S. Through this, a state is ensured in which the straight portion tubular bodies 2 and 2 cannot move relative to each other.

  On the other hand, if a large external force acts in the direction in which the pipes separate from each other due to ground displacement or cracking due to earthquake motion, and the ground displacement cannot be fully absorbed by the seismic detachment preventing joints 3 for each pipe curve part, the pipe for the curved part Since the connection strength between the bodies 1 and 1 is maintained by the strong-strength detachment resistance portion 18, a force due to seismic motion or the like acts on the earthquake-resistant detachment prevention joint 4 for the straight portion in a chained manner with the curved portion.

  At that time, in the thrust resistance portion 45, since the number of the straight portion stopper fittings 44, 44... Is small, when a large external force exceeding the shear strength of the straight portion stopper fittings 44, 44. 44, 44 ... are broken, and the straight portion insertion portion 37 is movable with respect to the straight portion collar portion 36, so that the straight portion tubular bodies 2, 2 can move relative to each other to absorb the displacement. It becomes a state.

  When the straight portion insertion portion 37 further moves in the withdrawal direction, as shown in FIG. 10B, the straight portion withdrawal prevention convex portion 39 forms the straight portion stopper fittings 41, 41. .. for the straight part from the collar part 36 for the straight part against the external force due to the seismic motion or the like by the shear resistance of the stopper fittings 41, 41. The plug-in portion 37 is prevented from coming out.

  At that time, the seismic detachment resistance portion 42 is provided with a large number of straight-line stopper metal fittings 41, 41..., And since the external force such as seismic motion is dispersed, a high proof strength is maintained. Thus, the straight portion insertion portion 37 can be suitably prevented from coming out of the straight portion collar portion 36.

  Next, the restoration of the seismic detachment preventing joint 3 for pipe curve after occurrence of earthquake motion will be described.

  As described above, in the seismic detachment prevention joint 3 for a curved line portion according to the present invention, when the external force due to seismic motion or the like exceeds the shear strength of the stopper fittings 16a to 16f constituting the normal detachment resistance portion 17, the insertion portion 12 is The small-diameter portion 22 at the tip of the stopper fittings 16a to 16f constituting the normal detachment resistance portion 17 is broken in order from the outside of the laying radius before the movement in the withdrawal direction is completed.

  Therefore, in the anti-seismic detachment preventing joint 3 for the curved line section after the end of the earthquake motion, the stopper fittings 16a to 16f arranged on the outer side of the installation radius are damaged, so that the movement of the joint outside the installation radius is not restricted. Therefore, the thrust force S cannot be countered.

  However, in this seismic detachment preventing joint 3 for the curved line portion, the normal detachment resisting portion 17 is removed by removing the damaged stopper fittings 16c and 16d constituting the normal detachment resistance portion 17 and attaching new stopper fittings 16c and 16d. Since the stopper fittings 16c, 16c constituting the engagement with the pull-out prevention convex portion 14 are opposed to the thrust force S by the shear resistance of the stopper fittings 16c, 16d disposed outside the laying radius, that is, the normal separation resistance portion 17. Can be restored.

  In addition, after the end of the earthquake, it may not be understood where the collar portion 11 and the insertion portion 12 are stationary, but even in that case, at least one of the normal separation resistance portions 17 is not included. If one stopper metal fitting 16a-16f engages with the escape prevention convex part 14, it can restore | restore in the state which opposes thrust force.

  Further, the straight part seismic detachment preventing joint 4 can also be restored to a state that opposes the thrust force S by replacing the straight part stopper brackets 44, 44... Of the broken thrust resistance part 45.

  In the above-described embodiment, the high-strength detachment resistance portion 18 has a narrower circumferential pitch between the stopper fitting portions 15 and 15 than the normal detachment resistance portion 17 of the insertion portion 12, and the stopper fitting portions 15 and 15 The insertion portion 12 is provided with stopper fitting portions 15, 15... At equal intervals in the circumferential direction, and the high-strength detachment resistance portion 18 has each stopper. The metal fitting protrudes from the outer peripheral surface of the insertion portion, and the normal release resistance portion 17 protrudes from the outer peripheral surface by the strength release resistance portion 18 as compared with the normal release resistance portion 17 so that each stopper metal fixture protrudes intermittently. You may make it increase the stopper metal fittings made.

  Moreover, although the above-mentioned Example demonstrated the example which used the propulsion pipe which consists of a synthetic steel pipe for each tubular body, each tubular body is not limited to this.

A Underground pipe 1 Curved tube 2 Straight line tube 3 Seismic detachment prevention joint 4 Curved seismic detachment joint 5 Outer steel pipe 6 Concrete layer 7 End plate 8 End plate 9 Reinforcement Rib 10 Reinforcing rib 11 Collar portion 12 Insertion portion 13 Water stop packing 14 Protrusion prevention portion 15 Stopper fitting portions 16a to 16m Stopper fitting 17 Normal release resistance portion 18 High strength release resistance portion 19 Stopper member 20 Insertion portion outer shell 21 Anchor nut 22 Small diameter portion 23 Male screw 24 Wrench hole 25 End face cushion material 30 Outer steel pipe 31 Concrete layer 32, 33 End plate 34, 35 Reinforcing rib 36 Straight portion collar portion 37 Straight portion insertion portion 38 Straight portion Water stop packing 39 Protrusion 40 for preventing straight line removal Stopper fitting 41 for seismic detachment resistance Straight stopper 42 for seismic detachment Resistance portion 43 Thrust resistance stopper fitting portion 44 Straight portion stopper fitting 45 Thrust resistance portion 46 Stopper member 47 Insertion portion outer shell 48 Anchor nut 49 Small diameter portion 50 Male screw 51 Wrench hole 52 End cushion material

Claims (6)

In the underground conduit having a curved portion formed by laying each tubular body, a cylindrical collar portion projecting to the other side from an end surface of one tubular body connected to each other, and an end of the other tubular body An insertion portion disposed in the collar portion, inserted into the collar portion, a water-stopping packing interposed in a gap between an inner peripheral surface of the collar portion and an outer peripheral surface of the insertion portion, and an inner peripheral surface of the collar portion A protrusion preventing protrusion protruding in a ring shape, a plurality of stopper fitting portions circumferentially spaced apart from each other on the distal end side outer peripheral portion of the insertion portion, and a radial direction on the stopper fitting portion A stopper fitting movably fitted to the collar portion, with the insertion portion inserted into the collar portion, the stopper fitting protrudes from the outer peripheral surface of the insertion portion in the insertion direction forward from the protrusion for preventing withdrawal, Remove both tubes A separation preventing joint that connects to the ability,
The insertion portion is provided with a strong separation resistance portion formed by projecting more stopper metal fittings from the outer peripheral surface of the insertion portion than the normal separation resistance portion arranged at other portions in the circumferential direction. A strength detachment resistance portion is arranged on the laying radius center side between the curved pipes, and the end face of the pipe is abutted on the laying radius center side, and the stopper metal fitting on the outer side of the laying radius and the protrusion preventing protrusion A seismic detachment prevention joint for a curved line section characterized by engaging with a section.   2. The pipeline curve portion according to claim 1, wherein the high-strength separation resistance portion has a narrower circumferential pitch between the stopper fitting portions than the normal separation resistance portion and includes a large number of the stopper fitting portions. Anti-seismic detachment prevention joint.   The insertion portion is provided with the stopper fitting portions at equal intervals in the circumferential direction.In the high-strength detachment resistance portion, the stopper metal fittings are projected from the outer peripheral surface of the insertion portion. The seismic detachment preventing joint for a curved line part according to claim 1, wherein each stopper metal fitting is projected intermittently.   The said stopper fitting part is equipped with the anchor nut which has an internal thread in the internal peripheral surface part, The male screw formed in the outer periphery of the said stopper metal fitting was screwed together by the said anchor nut. The seismic detachment preventing joint for a curved line section according to any one of the above. In the underground conduit having a curved portion formed by laying a plurality of curved portion pipes,
A cylindrical collar portion projecting from the end face of one tube connected to the other to the other side, an insertion portion disposed at the end of the other tube body and inserted into the collar portion, and an inner portion of the collar portion A water blocking packing interposed in a gap between the peripheral surface and the outer peripheral surface of the insertion portion, a slip-out preventing convex portion protruding in a ring shape on the inner peripheral surface of the collar portion, and an outer peripheral portion on the distal end side of the insertion portion. A plurality of stopper fitting portions that are spaced in the circumferential direction and directed in the radial direction, and stopper fittings that are fitted to the stopper fitting portions so as to be movable in the radial direction, and the periphery of the insertion portion Anti-seismic detachment joint for curved line sections with a strong detachment resistance part that protrudes more stopper fittings from the outer peripheral surface of the insertion part than the normal detachment resistance part arranged in the other part of the direction Use
The strong-strength detachment resistance portion is disposed on the center side of the laying radius between the tubes that are laid in a curved line, and the insertion portion is connected to the collar portion so that the end face of the tube body abuts on the center side of the laying radius. The stopper metal fitting is protruded from the outer periphery of the insertion portion in that state, and the stopper metal fitting on the outer peripheral side of the installation radius is engaged with the protrusion for preventing withdrawal. Pipeline. A cylindrical linear portion collar portion projecting to the other side from an end face of one straight portion tubular body connected to each other in the straight portion adjacent to the curved portion, and an end of the other straight portion tubular body A straight line interposed in the gap between the straight portion insertion portion inserted into the straight portion collar portion and the inner peripheral surface of the straight portion collar portion and the outer peripheral surface of the straight portion insertion portion. A water-stop packing for the part, and a straight-part slip-out preventing convex part protruding in a ring shape on the inner peripheral surface of the collar part
In the insertion portion for the straight portion, the stopper fitting for the straight portion is moved to each of a plurality of stopper fitting portions for seismic detachment resistance arranged radially at a desired circumferential pitch on the outer peripheral portion on the distal end side in the insertion direction. A seismic detachment resistance portion that can be fitted, and a plurality of thrust resistance stopper fitting portions arranged in a radial direction at a desired circumferential pitch with a distance in front of the seismic detachment resistance portion in the insertion direction. And a thrust resistance portion formed by movably fitting the stopper for the straight portion to each other,
The straight portion insertion portion is inserted into the straight portion collar portion, the straight portion stopper fittings are projected from the outer peripheral surface of the straight portion insertion portion, and the straight portion stopper fittings of the thrust resistance portion are connected to the straight portion. When a force of a certain level or more is applied between the straight tube parts, the straight stopper member for the thrust resistance part is damaged, and the straight part is prevented from coming out. The underground conduit according to claim 5, further comprising a seismic detachment preventing joint for a straight portion that allows the convex portion to move toward the seismic detachment resistance portion.

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