JP6044883B2 - Detachment prevention joint of propulsion pipe using steel concrete synthetic steel pipe - Google Patents

Description

  The present invention relates to a joint for preventing detachment of a propulsion pipe using a steel concrete synthetic steel pipe that is connected so as not to detach between the propulsion pipes adjacent in the axial direction in a propulsion method using a propulsion pipe using a steel concrete synthetic steel pipe.

  Conventionally, as a pipe joint for a concrete pipe having a detachment preventing function, for example, as shown in Patent Document 1, a groove for fitting a packing is formed on the inner surface of a collar portion at the end of one concrete pipe, and a water-stopping packing is formed on the groove. (Rubber wheel) is immovably fitted, and a ring-shaped concave groove is formed on the outer periphery of the other concrete pipe insertion part (spigot) to allow the water-stopping packing to move in the axial direction. Is inserted and connected to each other, the water blocking packing moves in the axial direction in the ring-shaped groove 6 and absorbs the relative movement of both concrete pipes, but cannot be detached from the end of the groove. A structure with the above structure has been developed.

JP 09-21166 A

  In the joint structure of the propulsion pipe with separation prevention as shown in Patent Document 1 described above, when an external force in the separation direction acts on the joint section, the slide of the water-tight packing against the collar section is provided between the propulsion pipes. When an external force that causes relative movement longer than the length is applied, it is only counteracted by the shear resistance force of the water-stopping packing, so it has a low anti-separation effect, especially at the beginning of use, such as in agricultural waterways. There was a problem that it could not be used in waterways where shocking internal pressure increases occurred.

  In view of such a conventional problem, the present invention uses a steel-concrete composite steel pipe that can sufficiently withstand even when a load acting in a separation direction is large, such as a water channel in which a shocking increase in internal pressure occurs. It was made for the purpose of providing a joint for preventing detachment of a propulsion pipe.

The first feature of the present invention is that a rear steel concrete composite steel pipe is used in a cylindrical steel collar portion integrally provided on the rear end surface of a propulsion pipe made of a steel concrete composite steel pipe on the front side. An insertion portion formed at the front end of the propulsion tube is inserted, and a joint of the propulsion tube with a ring-shaped water-stopping packing interposed between the outer periphery of the insertion portion and the inner surface of the collar portion,
The collar portion is provided with a diameter-reduced portion for contacting a stopper fitting that protrudes in a ring shape on the inner peripheral surface of the rear end of the collar portion, and the outer peripheral surface of the insertion portion is integrally formed with the outer shell steel pipe of the steel concrete composite steel pipe covered with a been plug outer shell, the said plug outer shell, 2 Article waterproof packing which slides in pressure contact with the inner peripheral surface of the collar portion on an outer periphery thereof is supported relative immovable The insertion portion is provided with a plurality of through holes for fitting stopper fittings in the radial direction between the two water-stopping packings at intervals in the circumferential direction , and the stopper fittings are provided in the through holes. Screwed,
The stopper metal fitting can be protruded until the tip is positioned outside the inner diameter of the reduced diameter portion of the collar portion in a state where the rear insertion portion is inserted into the collar portion of the front side propulsion pipe. The rear end side of the reduced diameter portion is a propulsion pipe using a steel concrete synthetic steel pipe having a cross-sectional shape inclined to the outer peripheral side of the collar portion so as to be reduced in diameter and pass through the water blocking packing portion . Located on the anti-separation joint.

The second feature of the present invention is that, in addition to the structure of claim 1, the insertion portion outer shell has two water-stopping packing fitting grooves formed on the outer periphery thereof, and each of the water-stopping packing fittings. The water stop packing is fitted in each of the grooves and is supported so as not to move relative to the insertion portion .

According to a third feature of the present invention, in addition to the structure of claim 1 or 2, the through hole is configured such that the tip of a cylindrical anchor nut having both ends opened through is inserted into a hole formed in the outer shell of the insertion portion. The anchor nut is embedded in the concrete layer of the insertion portion .

In the present invention, prior to lateral side of the steel-concrete composite steel steel in the color portion in which the cylindrical shape provided integrally with the rear end surface of the propulsion tube using a propulsion tube using a steel-concrete composite steel tube rear side A joint of a propulsion pipe in which a ring-shaped water-proof packing is interposed in a gap between the outer periphery of the insertion part and the inner surface of the collar part. A water-reducing packing that slides in contact with the inner peripheral surface of the collar portion is not movable on the outer periphery of the insertion portion. The insertion portion is provided with a plurality of through holes for fitting stopper fittings in the radial direction at intervals in the circumferential direction , and the inner peripheral surface of the through hole is embedded in the insertion portion. Exposed anchor nut screw hole In the state where the male screw formed on the outer periphery of the stopper fitting is screwed into the screw hole, and the insertion portion on the rear side is inserted into the collar portion of the propulsion tube on the front side, the stopper fitting is inserted into the propulsion tube. By operating the stopper fitting until the tip of the stopper fitting is positioned outside the inner diameter of the reduced diameter portion of the collar portion, the detachment preventing force at the joint is obtained by the shear resistance force of the stopper fitting. Therefore, the shear resistance larger than that of the rubber water-stopping packing as in the conventional case is obtained, and a high separation preventing effect is obtained.

Further, in the present invention, the outer periphery of the steel-concrete composite steel pipe is made of a steel shell by adopting the separation prevention mechanism having a structure in which the stopper fittings described above are arranged at intervals in the circumferential direction on the propulsion pipe using the steel-concrete composite steel pipe. Since it is covered, the shear strength is high, and even if stress concentrates on the stopper fitting position, the proof stress is greater than that of a normal concrete propulsion pipe.

  In addition, after being pushed into the ground in advance and propelled by joining the propulsion pipe on the rear side to the propulsion pipe, it is possible to carry out the work of protruding the stopper fitting in the ground, especially in curve propulsion, The axial angle of the front and rear propulsion pipes changes during the propulsion, but in the present invention, the function of preventing separation can be exhibited by an operation from within the completed pipe line. An appropriate detachment prevention state can be configured in accordance with the situation of the straight portion of the road and the joint portion of the curved portion.

The present invention, a water stop packing was supported on the difference and addition unit, and the insertion portion distal end side than the through hole for the stopper fitting engagement, by providing to the insertion rear end side, in particular as a curve propulsion construction When the stopper fitting must be protruded after the pipeline including the curved portion is completed, the intrusion of earth and sand into the portion where the tip of the stopper fitting protrudes is prevented, and the joint part is disengaged in the ground. Work for prevention can be performed safely and reliably.

The present invention, reduced-diameter portion of the color rear end, by a rear end side is a cross-sectional shape inclined to the collar outer periphery, when inserting the insertion portion into the collar, waterproof packing portion Reduced diameter facilitates passage, and even if the water-stopping packing behind the stopper bracket is detached from the collar due to a sudden rise in water pressure, the removed water-stopping packing will be an obstacle when returning to the reduced pressure state. It is possible to return to the original position again.

The Example of the separation prevention joint of the propulsion pipe using the steel concrete synthetic steel pipe which concerns on this invention is shown, and it is a fragmentary longitudinal cross-section which shows the state at the time of this propulsion pipe propulsion. It is the half cross-sectional view cut | disconnected in the stopper metal fitting position of the separation prevention joint of the propulsion pipe using the steel concrete synthetic steel pipe same as the above. It is a fragmentary longitudinal cross-section which shows the maximum separation state of the same propulsion pipe.

  Next, embodiments of the present invention will be described based on examples shown in the drawings.

  In the figure, reference numeral 10a denotes a propulsion pipe using a steel concrete synthetic steel pipe on the front side in the propulsion direction to be joined to each other, and 10b denotes a steel concrete synthetic steel pipe joined to the rear end of the propulsion pipe 10a on the front side. It is a propulsion pipe. Both of these propulsion pipes 10 a and 10 b have 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 numeral 32 denotes an end plate at the rear end of the front side propulsion pipe 10a, and 33 denotes a front end of the rear side propulsion pipe 10b, that is, an end plate at the front end of the insertion portion 13 described later.

  At the rear end of the propulsion pipe 10a on the front side, a joint collar portion 11 made of a steel pipe extending from the rear end of the outer shell steel pipe 30 is projected.

At the rear end of the collar portion 11, a reduced diameter portion 12 for abutting stopper metal fittings that protrudes in a ring shape on the inner peripheral surface thereof is integrally formed. The front side of the reduced diameter portion 12 is arcuate, and the rear end side is an inclined portion 12a that extends to the outer peripheral side of the collar portion.

  An insertion portion 13 formed so as to be narrower than the body portion of the central portion is integrally formed at the distal end of the propulsion tube 10b on the rear side. The insertion portion 13 has an insertion portion outer shell 30a obtained by reducing the diameter of the end portion of the outer shell steel pipe 30, and has a structure in which the concrete layer 31 described above is lined on the inner peripheral surface thereof.

  On the outer periphery of the insertion outer shell 30a, two water-stopping packing fitting grooves 14 and 15 are formed at intervals in the front-rear direction, and the water-stopping packings 16 and 17 are fitted into the grooves, respectively. It is mounted in a state in which relative starting in the axial direction is prevented.

  As one example, the water-stop packings 16 and 17 are formed by integrally molding a plurality of curved portions 18a whose outer week side is inclined in the direction opposite to the propulsion direction of the propulsion pipe into a plurality of shapes divided by cuts 18b. doing.

A plurality of through holes 20 for fitting stopper metal fittings in the radial direction are formed in the insertion portion 13 at intervals in the circumferential direction . The through holes 20 are formed on the same circumference in the circumferential direction of the insertion portion between the two water-stop packing fitting grooves 14 and 15 described above, and are arranged radially toward the center of the insertion portion 13. .

The through hole 20 is formed by inserting the tip of the anchor nut 21 into a hole formed in the insertion portion outer shell 30 a and welding it, and embedding it in the concrete layer 31. On the inner peripheral surface side of the insertion portion of these through-holes 20, a backfilling recess 22 having a diameter larger than this and a depth at which a predetermined concrete cover thickness can be obtained is formed.

A stopper fitting 25 is fitted in the anchor nut 21. The stopper fitting 25 is formed in a columnar shape, and an external thread is engraved on the outer peripheral surface excluding the distal end portion, and the distal end portion is formed with a smaller diameter than the external thread. At the rear end, a wrench fitting hole 26 made of a square wrench, for example, a hexagon hole for fitting a hexagon wrench is formed. The male screw on the outer periphery of the stopper fitting 25 is screwed into the screw hole of the anchor nut 21.

  Further, the entire length of the stopper fitting 25, that is, the length from the tip to the end face where the wrench fitting hole 26 is opened is formed shorter than the thickness of the insertion portion 13, and is not used during the operation for preventing the separation described later. The anchor nut 21 can be operated in a state where the entire length of the anchor nut 21 has entered the thickness of the insertion portion 13.

As shown in FIG. 1, the separation preventing joint constructed in this way is joined with the end face cushion material 28 between the end plates 32 and 33 of both the propulsion pipes 10a and 10b, and the predetermined propulsion work is completed. Later, that is, in a state where the rear insertion portion is inserted into the collar portion of the front propulsion pipe , the tip of the stopper fitting 25 is positioned outside the inner diameter of the reduced diameter portion 12 of the collar portion 11. Project until The projecting operation at this time can be confirmed to have a desired projecting length by projecting until the tip of the stopper metal 25 is brought into contact with the inner peripheral surface of the collar portion 11.

  In this state, when a large external force acting in a direction away from each other acts on both the propulsion pipes 10a and 10b and the insertion portion 13 moves to the withdrawal side, the stopper fitting 25 is compressed at the tip of the collar portion 11 as shown in FIG. When the diameter portion 12 is reached, the side surface comes into contact with the diameter portion 12 to prevent separation. The separation resistance at this time is handled by the shear resistance of all the stopper fittings 25.

  At this time, the water-stopping packing 17 on the rear end side of the insertion portion 13 of both the water-stopping packings comes out from the rear end of the collar 11, but the other water-stopping packing 16 causes a watertight state. Maintained. Thus, even if the water-stopping packing 17 located behind the stopper fitting 25 is detached from the collar portion 11, when the inside of the pipe returns to the reduced pressure state, the removed water-stopping packing is not hindered and is restored again. Return to position.

10a, 10b Propulsion pipe 11 Collar portion 11a Rib 12 Reduced diameter portion 12a Inclined portion 13 Insertion portion 14, 15 Water-stop packing fitting groove 16, 17 Water-stop packing 18a Curved portion 18b Cut 20 Through hole 21 Anchor nut 22 Backfill Recessed portion 25 Stopper fitting 26 Wrench fitting hole 28 End face cushioning material 30 Outer shell steel pipe 30a Insertion portion outer shell 31 Concrete layers 32 and 33 End plate

Claims (3)

Insertion formed at the front end of the propulsion pipe using the steel concrete composite steel pipe on the back side in the cylindrical steel collar part integrally provided on the rear end face of the propulsion pipe made of the steel concrete composite steel pipe on the front side A joint of a propulsion pipe in which a ring-shaped water-stopping packing is interposed in the gap between the outer periphery of the insertion part and the inner surface of the collar part,
Provided with a reduced diameter portion for abutting stopper metal fittings projected in a ring shape on the inner peripheral surface of the rear end of the collar portion ,
The outer peripheral surface of the insertion part is covered with an insertion part outer shell formed integrally with an outer shell steel pipe of the steel concrete composite steel pipe,
On the outer shell of the insertion part, two water-stopping packings that slide in pressure contact with the inner peripheral surface of the collar part are supported so as not to be relatively movable.
In addition, the insertion portion includes a plurality of through holes for fitting stopper metal fittings in the radial direction between the two water-stopping packings at intervals in the circumferential direction .
A stopper fitting is screwed into the through hole,
The stopper metal fitting can be protruded until the tip is positioned outside the inner diameter of the reduced diameter portion of the collar portion in a state where the rear insertion portion is inserted into the collar portion of the front side propulsion pipe. And
The rear end side of the reduced diameter portion is prevented from being detached from the propulsion pipe using a steel-concrete synthetic steel pipe having a cross-sectional shape inclined toward the outer peripheral side of the collar portion so that the diameter of the water-stopping packing portion can be reduced. Fittings. The insertion portion outer shell has two water-stopping packing fitting grooves formed on the outer periphery thereof, and the water-stopping packing is fitted in each of the water-stopping packing fitting grooves, and the insertion portion 2. A joint for preventing detachment of a propulsion pipe using the steel-concrete synthetic steel pipe according to claim 1, wherein the joint is supported so as not to move relative to the pipe. The through-hole is inserted and welded into a hole formed in the outer shell of the insertion portion at the tip of a cylindrical anchor nut with both ends penetrating open, and the anchor nut is embedded in the concrete layer of the insertion portion. A joint for preventing detachment of a propulsion pipe using the steel-concrete synthetic steel pipe according to claim 1 or 2.

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