JP2910812B2 - Pipe fittings for water pipe bridges - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for a water pipe bridge for forming a water pipe bridge constructed by connecting a plurality of pipes sequentially in an arch shape between a pair of anchor blocks.

[0002]

2. Description of the Related Art When laying a pipeline across a river or the like, the pipeline is often constituted by a water pipe bridge erected in the air between a pair of anchor blocks on both banks. In the water pipe bridge, it is necessary to provide a camber at the center of the pipe between the anchor blocks, and to connect a plurality of pipes sequentially so that the entire pipe has an arch shape having a gentle curvature.

[0003]

Therefore, each pipe joint in the water pipe bridge is capable of giving a predetermined bending angle to the pipeline and bending without being bent by an external load such as its own weight or water weight. There is a problem that it must have rigidity.

Accordingly, the present invention solves such a problem, and provides a pipe joint for a water pipe bridge which has a bending rigidity that can provide a predetermined bending angle to a pipe line and does not bend under an external load. The purpose is to provide.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to forming a socket at one end of one pipe joined to each other and inserting the socket at the end of the other pipe into the socket. Forming an annular groove, forming an annular groove on the outer periphery of the opening, fitting a pair of groove width adjusting rings at intervals in the annular groove, between the side surfaces of these groove width adjusting rings, A lock groove that has a bent groove whose axis is bent with respect to the insertion opening, the bent groove is formed of a plurality of divided pieces whose cross section is divided in the axial direction of the pipe, and is engaged with the inner periphery of the receiving opening. The tapered surface is formed at the part where the divided pieces contact each other, and at least one of the divided pieces is pressed inward in the radial direction to reduce the diameter. Expand the entire width and bend this lock ring It is provided with a pressing means to along the whole width.

[0006]

According to this structure, a pair of groove width adjusting rings is simply fitted into the non-bent annular groove formed on the outer periphery of the insertion slot, and the bent groove is formed between the side surfaces of these groove width adjusting rings. Be composed. A lock ring that engages the tapered surface of the divided piece formed by dividing the cross section in the axial direction of the tube into the bent groove and engages with the inner periphery of the receiving port is fitted. At least one split piece of the lock ring is pressed inward in the radial direction by the pressing means to reduce the diameter, so that the lock ring expands the entire width by the action of the tapered surface and follows the entire width of the bending groove. Thus, the socket and the socket are firmly joined, and a required bending angle is given between the axes of the socket and the socket.

[0007]

FIG. 5 shows a schematic structure of a water pipe bridge according to the present invention. Here, reference numeral 10 denotes a river, and concrete anchor blocks 12 are formed on both sides of the river. A water pipe bridge 14 is provided in the air above the water surface of the river 10 with the anchor blocks 12 as base ends. The water pipe bridge 14 is formed in an arch shape by joining a plurality of pipes 16 with pipe joints, and a camber 20 having an air valve 18 is provided at the center thereof. In the water pipe bridge 14 illustrated in FIG. 5, a normal mechanical pipe joint 22 and a pipe joint 24 according to the present invention are used.

FIG. 1 shows a detailed structure of a pipe joint 24 according to the present invention. Here, reference numeral 30 denotes a receiving port formed at an end of one of the pipes, and a tapered sealing material pressing surface 32, a lock ring receiving groove 34,
An insertion slot 36 is formed. Reference numeral 38 denotes an insertion hole formed at the end of the other tube, which is inserted into the receiving port 30. On the outer periphery of the insertion opening 38, an annular groove 40 having a relatively wide cross section and a rectangular shape is formed in the circumferential direction.

As shown in FIG. 1 and FIG.
A pair of groove width adjusting rings 4 spaced apart in the axial direction.
2, 44 are fitted. Each groove width adjustment ring 4
The reference numerals 2 and 44 are formed so as to be tightly divided in the circumferential direction, and are arranged such that one side surface is in contact with the side surface of the annular groove 40, so that the other side surface is located between the other side surfaces at the center of the annular groove 40. A bent groove 46 is formed. Bending groove 4
6 is inclined by an angle C with respect to the direction of the outer periphery of the insertion opening 38. The groove width adjusting rings 42 and 44 are configured such that their outer peripheral surfaces are flush with the outer peripheral surface of the insertion opening 38 when fitted into the annular groove 40.

A lock ring 48 is housed in the lock ring housing groove 34. This lock ring 48 is shown in FIG.
As shown in (a), the cross section is composed of divided pieces 48a, 48b, 48c formed by dividing into three in the axial direction of the pipe, and the tapered surface 48d formed on each of the divided pieces 48a, 48b, 48c. Are arranged so as to slidably contact each other. In addition, each divided piece 48a, 48
The reference numerals b and 48c are formed so that they can be split open in the circumferential direction. The lock ring 48 is set by a set bolt 50 as a pressing unit that is screwed through the socket 30.
It is fitted into the bending groove 46 in a pressed state. A seal cap 52 using a cap nut is screwed to a tip portion of the set bolt 50 protruding from the outer peripheral surface of the receiving port 30.

An annular sealing member 54 is arranged between the sealing member pressing surface 32 and the outer peripheral surface of the insertion opening 38. A press ring 56 is fitted into the insertion opening 38, and the press ring 56 is fastened to the flange 60 at the open end of the receiving port 30 by a T-head bolt 58. Demonstrates the sealing function.

In this configuration, the procedure of the construction work is shown in FIG.
This will be described with reference to FIG. Insert receptacle 36 of receptacle 30
The locking pieces 48a, 48b, and 48c of the lock ring 48 are inserted in the radially inwardly reduced state, and then the reduced diameter state is released. In the formed lock ring receiving groove 34, the divided pieces 48a, 4
The lock ring 48 is engaged in a state where the tapered surfaces 48d of 8b and 48c are in contact with each other. Insert 38 inside receiving port 30
Is inserted, and the sealing material 54 is compressed. As shown in FIG. 3B, the divided piece 48b of the lock ring 48 shown in FIG. 3A is pressed inward in the radial direction by the set bolt 50 to reduce the diameter, so that the lock ring 48 becomes tapered. By the action of the surface 48d, the entire width L is expanded to follow the entire width M of the bent groove 46. In this way, the receiving port 30 and the insertion port 38 are joined to each other in a state where the receiving port 30 and the insertion port 38 are bent at an angle C equal to the inclination angle C of the bending groove 46. For this reason,
As shown in FIG. 5, by installing the required number of pipe joints 24 having this configuration, the water pipe bridge 14 can be formed in an arch shape as shown.

With this configuration, the bent groove 46 can be easily formed only by fitting the pair of groove width adjusting rings 42 and 44 into the normal circumferential groove 40 having no inclination. Then, as shown in FIG. 3, the lock ring 48
Fitted in the bending groove 46 and housed in the lock ring housing groove 34,
6, the bottom of the annular groove 40 and the bent groove 46
Are pressed by the side surfaces 46a and 46b of the lock ring accommodating groove 34 and the side surfaces 34a and 34b of the lock ring accommodating groove 34.
8 can be firmly joined, a predetermined bending angle can be given to the pipeline, and sufficient bending rigidity that does not bend even under an external load such as its own weight or water weight can be obtained. Here, the receiving port 30 and the insertion port 38 can be bent at an arbitrary angle by exchanging the groove width adjusting rings 42 and 44 to form bending grooves having different inclination angles.

In the above embodiment, the lock ring 48 is
The divided pieces 48a, 48b, and 48c are formed by dividing, and the divided pieces 48b are pressed inward in the radial direction by the set bolts 50 to reduce the diameter, so that the lock ring 48 has the entire width by the action of the tapered surface 48d. Expand L and bend groove 46
Press the bottom 46c and the side surfaces 46a, 46b of the bent groove 46 and the side surfaces 34a, 34b of the lock ring housing groove 34 along the entire width M so that the socket 30 and the insertion opening 38 are firmly joined. However, as shown in FIG. 4A, the lock ring 49 is divided into two parts,
9b, and as shown in FIG.
Is pressed inward in the radial direction by the set bolt 50 to reduce the diameter, so that the lock ring 49 expands the entire width L by the action of the tapered surface 49c, and the entire width M of the bent groove 46 is increased.
Along the bottom 46c and the side surfaces 46a and 46b of the bent groove 46 and the side surface 34 of the lock ring housing groove 34.
a and 34b may be pressed so that the socket 30 and the insertion port 38 are firmly joined to each other. With this configuration, a similar effect can be obtained.

[0015]

As described above, according to the present invention, it is only necessary to fit a pair of groove width adjusting rings into the unbent annular groove formed on the outer periphery of the insertion opening, and the side surfaces of these groove width adjusting rings are joined together. A bendable groove can be formed between the grooves, and a lock ring that engages the tapered surface of the divided piece formed by dividing the cross section in the axial direction of the pipe into the bent groove and engages with the inner periphery of the receiving port is fitted. By pressing at least one of the divided pieces radially inward by the pressing means to reduce the diameter, the entire width of the lock ring can be expanded by the action of the tapered surface, and the lock ring can be along the entire width of the bent groove. Therefore, it is possible to reduce and reduce the play between the groove on the receiving side and the lock ring and the play between the bent groove and the lock ring on the insertion side and the difference in processing accuracy. For this reason, the socket and the insertion port can be firmly joined, and a required bending angle can be given between the axes of the reception port and the insertion port. As a result, a predetermined bending angle can be given to the pipeline, and a bending rigidity that does not bend under an external load can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a pipe joint for a water pipe bridge according to an embodiment of the present invention.

FIG. 2 is an external view of an insertion opening of the embodiment.

FIG. 3 is an operation explanatory view of the lock ring of the embodiment.

FIG. 4 is a diagram illustrating the operation of a lock ring according to another embodiment.

FIG. 5 is a diagram showing a schematic configuration of a water pipe bridge based on the present invention.

[Explanation of symbols]

 Reference Signs List 30 receiving opening 38 insertion opening 40 annular groove 42, 44 groove width adjusting ring 46 bending groove 48 lock ring 50 set bolt

Claims (1)

(57) [Claims] 1. A pipe joint for a water pipe bridge constructed by sequentially connecting a plurality of pipes in an arch shape between a pair of anchor blocks, wherein a receiving port is formed at an end of one of the pipes joined to each other. At the same time, an insertion hole to be inserted into the socket is formed at the end of the other tube, an annular groove is formed on the outer periphery of the insertion hole, and a pair of groove width adjusting rings are fitted at intervals in the annular groove. In addition, between the side surfaces of these groove width adjustment rings, a bent groove whose axis is bent with respect to the insertion hole is formed, and a plurality of cross sections of the bent groove having a cross section divided in the axial direction of the pipe. A lock ring composed of the divided pieces and engaging with the inner periphery of the receiving port is fitted, a tapered surface is formed at a portion where the divided pieces contact each other, and at least one of the divided pieces is pressed inward in the radial direction. The diameter of the lock ring is reduced by the action of the tapered surface by reducing the diameter. A pipe joint for a water pipe bridge provided with a pressing means for enlarging the entire width of the ring and making the lock ring extend along the entire width of the bent groove.