JP5675556B2 - Water pipe bridge expansion joint breakage prevention device - Google Patents

Description

  The present invention relates to an expansion tube breakage prevention device for a water pipe bridge that prevents breakage of an expansion tube joint.

  A water pipe bridge in which water pipes such as water pipes are laid so as to cross rivers, etc., as described in Patent Document 1, water pipes installed on the shore side are connected to the shore side through expansion pipe joints. By connecting to the expansion pipe, the expansion and contraction of the water pipe due to temperature change and the like is absorbed by the expansion pipe joint so that the installed water pipe is not damaged.

  Further, as shown in FIG. 7, a falling bridge prevention device 90 is provided at the end 11 a of the water pipe 11 so that the water pipe 11 installed due to an earthquake or the like does not fall from the abutment 15.

  Here, the falling bridge prevention device 90 will be described. The fixing piece 92 fixed to the outer peripheral surface of the end portion 11a of the water pipe 11 and the end portion 11a to which the fixing piece 92 of the water pipe 11 is fixed are supported. The base end is attached to the abutment 15, and extends in parallel with the water pipe 11 and passes through the fixing piece 92, and is provided at the distal end of the rod body 91, and is attached to the fixing piece via the coil spring 93 And a stopper 95 for pressing 92. The falling bridge prevention device 90 prevents the water flow pipe 11 from dropping from the abutment 15 by the stopper 95 stopping the movement of the water flow pipe 11.

JP 2003-90011 A

  However, since the falling bridge prevention device 90 can only stop the movement of the water passage 11 in the direction in which the expansion joint 12 is extended, the water passage 11 moves in the direction in which the expansion joint 12 contracts due to a large earthquake or the like. In that case, the falling bridge prevention device 90 could not stop the movement of the water pipe 11, and the expansion joint 12 could be damaged.

  Therefore, an object of the present invention is to provide a water pipe bridge expansion pipe joint breakage prevention device that prevents the expansion pipe joint from being damaged by stopping the movement of the water pipe in the direction in which the expansion pipe joint is contracted.

  In order to solve the above-mentioned problems, the expansion joint breakage prevention device for a water pipe bridge according to the present invention has a water pipe installed between two abutments and an expansion pipe joint connected to an end of the water pipe. The fixed piece fixed to the outer peripheral surface of the water pipe, and the movement of the water pipe in the direction of contracting the expansion joint, by pressing the fixed piece, until reaching the shrinkage limit of the expansion pipe joint The moving stop body which stops is provided, It is characterized by the above-mentioned.

  Moreover, the expansion pipe joint breakage prevention device of another water pipe bridge of the present invention is constructed such that a water pipe is installed between two abutments, an expansion pipe joint is connected to an end of the water pipe, and an outer periphery of the water pipe An adhering piece fixed to a surface, a rod attached to the abutment supporting the end portion, extending in parallel with the water pipe and penetrating the adhering piece, and the adhering The movement pipe is attached to the rod body at the tip end side of the rod body from the piece, and the movement pipe moves in the direction of extending the expansion joint. A fall bridge prevention device having a fall stop preventing movement stop body that stops before dropping, and is attached to the rod body on the proximal end side of the rod body from the fixed piece, and contracts the expansion joint The movement of the water pipe to the pressure limit of the expansion joint by pressing the fixed piece Characterized in that it comprises a movement stop member to stop.

  Here, the shrinkage limit of the expansion joint is a limit at which the expansion joint can be contracted without being damaged.

  The fixing piece is not particularly limited, but may be integral with the ring support that supports the end of the water pipe on the abutment, or may be separate from the ring support.

A movement stop body has a thing provided with the elastic body which urges | biases a fixed piece to the direction which expands an expansion-contraction pipe joint, and a thing which is not provided. As the amount of movement of the water pipe increases, the pressing force for stopping the movement can be increased and the impact when the movement of the water pipe is stopped can be reduced. What has the elastic body which energizes is preferable. In addition, the movement stop body is not particularly limited as a mode for stopping the movement of the water pipe by pressing the fixed piece, but when the elastic body is not provided, the fixed piece abuts against the movement stop body and is pressed In this mode, the movement of the water pipe is stopped. When the elastic body is provided, the elastic body is not only pressed to stop the movement of the water pipe by pressing the elastic body in a compressed state. There is a mode in which the movement of the water pipe is stopped by being pressed by the pressing force of the elastic body over the force that moves the water pipe in the middle of being compressed.
Here, the elastic body is not particularly limited, but a spring, an air spring, a rubber-like body and the like can be exemplified, and a spring is preferable because of high durability and low cost.

  ADVANTAGE OF THE INVENTION According to this invention, the expansion | extension pipe joint breakage prevention apparatus of the water pipe bridge which stops the movement of a water flow pipe to the direction which shrinks | contracts an expansion pipe joint and prevents a damage of an expansion pipe joint can be provided.

It is a side view of the water pipe bridge using the expansion-pipe joint damage prevention apparatus of the water pipe bridge of the Example of this invention. It is an enlarged plan view near the abutment of the water pipe bridge. It is an enlarged side view near the abutment of the water pipe bridge. It is an expanded side view of the principal part of the expansion-pipe joint damage prevention apparatus of the water pipe bridge of the Example of this invention. It is explanatory drawing of an effect | action of the expansion-contraction pipe | tube joint damage prevention apparatus. It is explanatory drawing of an effect | action of the expansion-contraction pipe | tube joint damage prevention apparatus. It is an enlarged side view of the vicinity of the abutment of a water pipe bridge using a conventional falling bridge prevention device.

  The expansion pipe joint breakage preventing device 20 for a water pipe bridge according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, an expansion pipe joint breakage prevention device 20 for a water pipe bridge has expansion pipe joints 12 at both ends of a water pipe 11 installed between two abutments 15 provided on both banks S of a river R. It is used for the simple support type water pipe bridge 10 connected. In addition, as shown in FIG. 2, one expansion pipe joint breakage prevention device 20 for the water pipe bridge is provided on each side of the water pipe 11. In addition, the expansion pipe joint breakage prevention apparatus 20 of a water pipe bridge can also be used for the one end fixed one end support type water pipe bridge by which an expansion joint is connected only to one end of the water flow pipe constructed between the abutments.

  The water flow pipe 11 is a substantially cylindrical steel pipe and is supported by a ring support 13 fixed to the outer peripheral surface of the end portion 11a by welding. The ring support 13 has a substantially flat leg portion 14 attached to the lower end. The ring support 13 is laid on a horizontal surface 15f of the abutment 15 and is placed on a steel pedestal 17 having a smooth upper surface. And the ring support 13 moves on the leg stand 17 with the displacement of the water pipe 11 such as expansion and contraction.

  The expansion pipe joint 12 includes a substantially cylindrical outer pipe 12b, a substantially cylindrical first inner pipe 12c extending from one end of the outer pipe 12b and connected to the water flow pipe 11, and from the other end of the outer pipe 12b. The second inner pipe 12d extends and is connected to the land-side water pipe 16 in a substantially cylindrical shape. The expansion pipe joint 12 connects the water pipe 11 and the land side water pipe 16, and expands and contracts when the first inner pipe 12 c moves to absorb the expansion and contraction of the water pipe 11.

  As shown in FIGS. 2 to 4, the expansion joint failure preventing device 20 of the water pipe bridge includes a fixing piece 30 extending from the ring support 13 in a horizontal direction orthogonal to the axial direction of the water pipe 11, and the abutment 15. A base 21 attached to the vertical surface 15w, extending parallel to the water pipe 11 and penetrating the fixing piece 30, and a moving stop 41 for preventing a falling bridge attached to the bar 21; And a movement stop body 46 attached to the rod body 21. In addition, the adhering piece 30, the rod body 21, and the moving stop body 41 for preventing a fall bridge constitute a fall bridge prevention apparatus.

  The fixing piece 30 is a substantially square columnar steel material, and is fixed to the ring support 13 by welding. Further, a hole 31 for inserting the rod body 21 is formed.

  The rod body 21 is made of a round bar steel material, and a bush 23 is fitted to the base end portion by a pair of nuts 22 screwed into the rod body 21. And it is attached to the vertical surface 15w via the mounting bracket 25 which supports the bush 23 rotatably. The mounting bracket 25 is fixed to the vertical surface 15w by a nut 27 that is screwed into a mounting pin 26 that is placed on the vertical surface 15w. The rod body 21 is supported by the bushing 23 rotatably on the mounting bracket 25, so that the displacement in the axial direction is restricted, but the displacement in the direction of rotation about the shaft is not restricted, and the rod body 21 is rotated. Supported as possible.

  The moving stop body 41 for preventing a falling bridge is provided on the distal end side of the rod body 21 from the fixed piece 30 and covered with a protective cover 36 made of bellows-like rubber. Moreover, the moving stop body 41 for preventing the falling bridge is interposed between the stopper 42 fixed to the rod body 21, the buffer body 44 in contact with the fixed piece 30, and the stopper 42 and the buffer body 44, And a coil spring 43 that urges the buffer body 44 so as to abut against the fixed piece 30. In addition, the coil spring 43 urges the fixed piece 30 in a direction in which the expansion joint 12 is contracted.

  The movement stop body 46 is provided on the proximal end side of the rod body 21 with respect to the fixed piece 30 and is covered with a protective cover 37 made of bellows-like rubber. The movement stop body 46 is interposed between the stopper 47 fixed to the rod body 21, the buffer body 49 in contact with the fixed piece 30, and the stopper 47 and the buffer body 49. And a coil spring 48 that urges the buffer body 49 so as to abut against it. In addition, the coil spring 48 urges the fixed piece 30 in the direction in which the expansion joint 12 is extended.

  Next, the effect | action of the expansion pipe joint damage prevention apparatus 20 of a water pipe bridge is demonstrated using FIG. 5, FIG.

  As shown in FIG. 5, when the water flow pipe 11 moves in the direction in which the expansion joint 12 is contracted, the first inner pipe 12c abuts on the second inner pipe 12d (the first inner pipe 12c is in the second inner pipe). The movement stop body 46 presses the fixing piece 30 to stop the movement of the water pipe 11 by the time when the pipe 12d is in contact with the expansion limit of the expansion pipe joint 12). Until the expansion limit of the expansion joint 12 is reached, the movement in the direction of contraction of the expansion joint 12 is stopped.

  On the other hand, as shown in FIG. 6, when the water flow pipe 11 moves in the direction in which the expansion joint 12 is extended, before the ring support 13 falls from the footrest 17, the fall stop prevention stop 41 is fixed. Since the movement of the water pipe 11 is stopped by pressing 30, the movement of the water pipe 11 in the direction in which the expansion joint 12 is extended before dropping from the abutment 15 is stopped.

According to the expansion pipe joint breakage preventing device 20 of the water pipe bridge, the following effects can be obtained.
-Since the movement of the water flow pipe 11 in the direction in which the expansion joint 12 is contracted is stopped until the contraction limit of the expansion joint 12 is reached, the expansion joint 12 can be prevented from being damaged.
The movement of the water pipe 11 in the direction in which the expansion joint 12 is extended is stopped before the ring support 13 falls from the pedestal 17, so that the water pipe 11 can be prevented from falling from the abutment 15.
Since the moving stop body 41 and the movement stop body 46 for preventing the falling bridge are respectively provided with coil springs 43 and 48 for urging the fixing piece 30, the movement amount of the water pipe 11 increases as the movement amount of the water pipe 11 increases. The pressing force for stopping the movement can be increased, and the impact when the movement of the water pipe 11 is stopped can be reduced.
-In this example, the expansion prevention device for expansion joints of the water pipe bridge is installed in the falling bridge prevention device, so that both prevention devices are installed in one place compared to the case where it is installed separately from the falling bridge prevention device. Can be installed together, and the number of parts can be reduced by sharing the fixing piece 30 and the rod 21 for both prevention devices, so that the cost can be reduced and maintenance after the installation can be done in one place. Can be done together.

In addition, this invention is not limited to the said Example, In the range which does not deviate from the meaning of invention, it can change suitably and can be actualized.
For example, it is used for a one-end fixed one-end supported water pipe bridge in which an expansion joint is connected to only one end of a water pipe installed between abutments.

DESCRIPTION OF SYMBOLS 10 Simple support type water pipe bridge 11 Water flow pipe 11a End part 12 Expansion pipe joint 15 Abutment 20 Expansion pipe joint damage prevention apparatus of water pipe bridge 21 Rod body 30 Adhering piece 41 Moving stop body for falling bridge prevention 46 Movement stop body 48 Coil spring

Claims (3)

A water pipe (11) is installed between two abutments (15), and an expansion joint (12) is connected to the end (11a) of the water pipe (11).
An adhering piece (30) adhering to the outer peripheral surface of the water pipe (11);
The movement of the water pipe (11) in the direction in which the expansion joint (12) is contracted is stopped by pressing the fixing piece (30) until the expansion limit of the expansion joint (12) is reached. An expansion pipe joint breakage prevention device for a water pipe bridge, comprising: a movement stop body (46). A water pipe (11) is installed between two abutments (15), and an expansion joint (12) is connected to the end (11a) of the water pipe (11).
An adhering piece (30) adhering to the outer peripheral surface of the water pipe (11);
A rod (21) having a base end attached to the abutment (15) supporting the end (11a), extending parallel to the water pipe (11) and penetrating the fixing piece (30). )When,
The water pipe (11) is moved in the direction in which the expansion pipe joint (12) is extended by being attached to the rod body (21) on the distal end side of the rod body (21) from the fixing piece (30). A falling bridge prevention device comprising a fall stop prevention stop (41) that stops the water pipe (11) from falling off the abutment (15) by pressing the fixing piece (30). ,
Movement of the water flow pipe (11) in a direction in which the stick (21) is attached to the stick (21) on the base end side of the stick (21) and the expansion joint (12) is contracted. A movable stop body (46) for stopping the expansion pipe joint (12) by pressing the fixing piece (30) to prevent the expansion pipe joint from being damaged. apparatus.   The water pipe bridge according to claim 1 or 2, wherein the movement stopping body (46) includes an elastic body (48) that biases the fixing piece (30) in a direction in which the expansion joint (12) is extended. Expansion joint breakage prevention device.

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