JPS5947189B2 - pipe fittings - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to joints used for connecting public road caissons, concrete culverts, steel culverts, Huyum W'& any public road, maintaining water-stopping properties and durability. In particular, the present invention relates to a pipe joint that greatly improves the ease of assembling a caisson for underwater installation.

Generally, as a pipe joint, a short cylindrical flexible member made of an elastic material such as rubber or synthetic resin is provided across a pair of pipes to be connected, and both ends of the flexible member are connected. It is conceivable to fix it with bolts on the inner circumferential wall of the pipeline.

In this case, fixation is usually done by placing bolts at regular intervals on the conduit side, and by making bolt insertion holes in advance at both ends of the flexible member. This is done by inserting a bolt fixed to the pipe through the bolt insertion hole of the member and tightening it so that it cannot be removed.This allows water to be shut off inside and outside the pipe while absorbing relative displacement between the opposing pipes. It is now possible to aim for

However, the distance between the ends of the conduit to be connected generally varies considerably, especially when placed underwater, and the distance between the bolt insertion hole of the flexible member and the bolt on the conduit side is Normally, the positions do not match, so in order to insert the bolt into the bolt insertion hole, the flexible member must be expanded and contracted using human power or a jig at the site during construction.

This is because the flexible member itself has considerable rigidity, so it is a work that requires a lot of time and skill.Especially work such as culverts where space is limited or caissons placed underwater. Connecting pipes under poor conditions has been an extremely difficult task, and it has been desired to develop a pipe joint with good workability that allows easy attachment of flexible members.

In order to meet these demands, the present invention eliminates the need for the conventional engagement between bolts on the pipeline side and bolt insertion holes in the flexible member when attaching the flexible member, and also improves the ability to prevent detachment and prevent water leakage. The object of the present invention is to provide a pipe joint in which the assemblability of a caisson placed in water is significantly improved to 1% while maintaining the ability to absorb displacement between pipes.

Embodiments of the pipe joint of the present invention will be described below with reference to the drawings.

In Fig. 1, 1.1'(d) shows a pair of pipes to be connected consisting of a tubular caisson, a concrete culvert, a steel culvert, a humid pipe, etc.

In the figure, the pipes 1 and 1' are shown as having a rectangular cross-section, but the cross-section is not limited to a rectangular shape;
It may be polygonal, circular, etc.

Further, although one hollow portion 1 a and one hollow portion 1 a′ in each of the pipes 1° 1′ is shown, there may be a plurality of hollow portions 1 a and 1 a′.

A short cylindrical flexible member 2 made of an elastic material such as rubber or synthetic resin is installed between the pipes 1 and 1'.

Figure 2 shows a cross section of a pipe joint, but since it basically has a symmetrical structure, the following explanation will mainly focus on
- Explanation of the other pipe 1' side is required by adding a dash to the symbol of the member on the pipe 1 side to the corresponding part on the pipe 1' side. Omitted as appropriate.

In FIG. 2, stepped portions 3, 3' are provided on the inner circumferential surfaces of the ends of the conduits 1, 1'.

Segment-shaped mounting members 4, 4', which have rigidity and are divided into a plurality of pieces in the circumferential direction of the joint, are anchored to each of the stepped portions 3゜3' and are arranged in the circumferential direction of the joint. The attached mounting members 4, 4' form a cylindrical body as a whole.

The stepped portion 3 includes an inner inner wall surface 3a extending in the joint radial direction on the inner inner side of the conduit 1, an annular wall surface 3b extending substantially horizontally in the joint axial direction from the outer peripheral end of the inner inner wall surface 3a, and an end portion of the annular wall surface 3b. The radius of the joint provided in the.

It has a protrusion 3C that protrudes inward, and an inclined wall surface 3d that extends obliquely from the protrusion 3c outward in the radial direction of the joint to the end surface of the conduit 1.

On the other hand, the mounting member 4 is made up of segments having a thickness that is approximately the same as the depth of the stepped portion 3.

The outer circumferential surface of the mounting member 4 is partially in contact with the annular wall surface 3b of the stepped portion 3, and partially faces the inner side of the protruding portion 3c of the annular wall surface 3b, extending over a predetermined length in the joint radial direction. A stepped portion 5 consisting of an extending wall surface 5a and a wall surface 5b extending in the joint axial direction is formed in an annular shape so as to extend in the joint circumferential direction.

A protrusion 5c that protrudes toward the protrusion 3c is provided on the step 5 at a position facing the protrusion 3c of the step 3.

The annular wall surface 3b of the stepped portion 3 of the conduit 1 and the wall surface 5 of the mounting member 4
a.

The space 6 surrounded by the space 6 forms an annular space that extends in the axial direction of the joint. It forms a narrow open lower.

A short cylindrical flexible member 2 is provided between spaces 6 and 6' formed in the pair of conduits 1 and 1'.

Bulging portions 2a, 2a' are formed at the ends of the flexible member 2, and both ends connected to the bulging portions 2a, 2a' are formed in a straight line. 2a' is the space 6
, 6'.

The height hl of the bulging portions 2a and 2a' is the same as the open lower portion. Since the flexible member 2 has a height h2 of 7', both ends of the flexible member 2 cannot be removed from the space 6°6' in the attached state.

Swollen portion 2a. The height hl of 2a' is slightly thicker than the height h3 of the spaces 6, 6', and the bulges 2a, 2a' and the stepped parts 3,
The pressure contact portions 3' with the annular wall surfaces 3b, 3b' function as a water stopper.

Note that the configuration of the space portion 6 described above is not limited to that shown in this embodiment, and although not shown in the figure, the configuration of the space portion 6 is not limited to that shown in this embodiment.
An annular groove is provided between the annular groove and the outer peripheral wall surface of the mounting member 4, or an annular groove is provided in each of the step portion 3 and the mounting member 4, and this rain cloud-shaped groove is formed between the annular groove and the outer peripheral wall surface of the mounting member 4. Various forms are possible, such as one in which one space is formed facing each other, and substantially the bulges 2a at both ends of the flexible member 2
, 2a' can be inserted into the interior in a non-removable state and in a state in which the stepped portion 3 and the mounting member 4 are in pressure contact from the inner and outer peripheries.

The central part of the flexible member 2 has a structure that allows a large amount of expansion and contraction to sufficiently absorb the relative displacement that occurs between the two conduits 1 and 1'. It is desirable to form the cross-sectional waveform as shown in the figure or the cross-sectional U-shape as shown in FIG. 3, but it is needless to say that the shape is not limited to this.

The end 4a of the mounting member 4 on the side of the pipe end surface extends so as to protect the inner circumferential surface of the flexible member 2, and the surface 4b of the end 4a on the side facing the flexible member 2 extends inside. Inclined in the circumferential direction,
In cooperation with the inclined surface 3d of the stepped portion 3, the flexible member 2 is allowed to deform freely and is prevented from being damaged when the flexible member 2 is deformed.

The spacing d between the ends 4a, 4a' of the mounting members 4, 4' is equal to or more than the spacing between the conduits 1, 1';
Before the conduits 1, 1' come into close contact with each other, the mounting member 4
, 4' are in contact with each other so as not to reduce the amount of displacement between the pipes 1, 1'.

The extension lengths of the ends 4a, 4a' of the mounting members 4, 4' do not need to be symmetrical as shown in FIG. It is extended so as to cover the inner circumferential position at intervals of 1°1', and when the flexible member 2 is displaced to the inner circumferential side due to earth pressure, it is supported by the elongated end 4a or 4a'. You may also do so.

In addition, as shown in FIG.
, 4 It is also possible to use one that does not extend a', and this can be selected arbitrarily.

In FIGS. 2 and 3, the attachment member 4 is attached to the conduit 1 by inserting a bolt provided on the attachment member 4 into a fixture 8, such as an anchor bolt, which is fixed in advance to the conduit 1. Although it is shown that the hole 9 is inserted through the hole 9 and tightened with the nut 10, the present invention is not limited to this. Of course, various other mounting methods may be used, such as by inserting the bolt through the bolt insertion hole 9 and tightening the bolt.

In addition, a joint material 11 made of sponge rubber, foamed synthetic resin, As7furt, putty, caulking material, etc. is interposed on the outer circumferential side of the flexible member 2 in the space between the pipes 1 and 1'. There is.

The installation method and operation of a pipe joint having the above configuration will be explained.

First, the flexible member 2 is applied from the inside of the pipes 1, 1' across the steps 3, 3' of the pipes 1, 1', and the mounting members 4, 4' are attached to the corresponding rear steps 3, 3'. This is done by fixing.

In this case, since the mounting member 4゜4' is attached to each of the pipes 1 and 1', even if there is a variation in the spacing between the pipes 1 and 1', it is possible to absorb the error and ensure accurate It can be easily anchored in pipes 1 and 1'.

In addition, the flexible member 2 is held in a space 6 formed between the outer circumferential surface of the mounting member 4 and the stepped portion 3 of the conduit 1 by the bulging portion 2a.
Since it is only necessary to insert the flexible member into the bolt insertion hole and install it, there is no need to insert a bolt into the bolt insertion hole of the flexible member as in the conventional case. Even if there is variation in the spacing between 1', the error can be absorbed and installation can be made easily.

Further, by this attachment, the stepped portion 3 and the attachment member 4 press the bulge portion 2a of the flexible member 2 from the inner and outer peripheries, so that water stoppage is naturally ensured.

When a relative displacement occurs between the water pipes 1 and 1' due to ground subsidence or an earthquake, the flexible member 2 deforms to follow the change and absorbs the displacement while maintaining water-tightness. do.

When pipes 1 and 1' are displaced and separated significantly, pipes 1 and 1'
External earth and sand may enter through the gap between the flexible members 2 and 2.
tends to bulge inward, but when the ends 4a, 4a' of the mounting members 4, 4' are extended, the ends 4a,
4 a' supports this and prevents the flexible member 2 from expanding.

In this case, if the end portions 4a, 4a' are provided so as to cover the inner peripheral position of the interval between the conduits 1, 1', the supporting effect thereof will be increased.

Even when the conduits 1 and 1' are separated by a large distance, the flexible member 2 will not come off from the space 6 because the bulging portion 2a of the member 2 is engaged by the opening lower.

The embodiment shown in FIG. 3 differs from the embodiment shown in FIG. 2 in the shapes of the mounting members 4, 4' and the flexible member 2 described above in the explanation of FIG. Since this is the same as the pipe joint, the corresponding parts will be given the same reference numerals and their explanation will be omitted.

In this embodiment, the intermediate inner circumferential surface of the flexible member 2 is shown flush with the inner circumferential surfaces of the opposing pipes 1 and 1'.

A structure formed in this manner is preferable in that it does not create resistance to water flowing inside the pipe, but is not limited thereto.

In addition, in the embodiment shown in FIGS. 2 and 3, the displacement of the center of the flexible member 2 when the pressure on the inner circumference of the conduit exceeds due to the pressure difference between the inner and outer circumferences of the conduits 1 and 1' is pipe 1
, 1', but even if displaced, the inclined wall surface 3d
, 3d' and the inner surface of the joint material 11 prevent further expansion, so that it will not extend outward and be damaged.

When using the pipe joint of the present invention, the mounting member is anchored to the inner peripheral surface of the end of the pair of pipes, more specifically, to the step formed on the inner peripheral surface, and the outer peripheral surface of the mounting member and the pipe are anchored. Simply attach a short cylindrical flexible member with a bulge at both ends with the bulge inserted into the annular space formed between the inner circumferential surfaces of the joint and extending slenderly in the axial direction of the joint. As a result, there is no need to insert the bolts attached to the conduit through the bolt insertion holes provided in the flexible member as in the past, making it extremely easy to connect the joints even if there is a large error in the spacing between the conduit lines to be connected. Can be installed.

Therefore, it is possible to easily assemble and connect even pipes with poor workability such as underwater caissons or underground conduits that are difficult to install due to limited space. It is possible to save labor.

Further, the height of the bulge is larger than that of the space, the length in the longitudinal direction of the space is greater than the length of the bulge, and both ends connected to the bulge are straight. Since the bulge is formed in such a way that the position of the bulge can be set arbitrarily in the longitudinal direction of the space, it is possible to set the position of the bulge arbitrarily in the longitudinal direction of the space. Installation is easy even when the axes of the pipes cross each other due to unevenness, when the axes are offset while remaining parallel to each other, or when the axes do not intersect but are at an angle. It turns out.

Furthermore, since both ends of the flexible member connected to the bulge are formed in a straight line, the straight portions are pressed into contact with the opening of the space regardless of the position of the bulge in the space. In particular, watertightness is ensured.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a pipe line connected using the pipe joint of the present invention, FIG. 2 is an enlarged sectional view taken along the line ■-■ in FIG. 1, and FIG. FIG. 7 is a sectional view showing another example of a pipe joint. 1.1'... Conduit, 2... Flexible member, 2a, 2a'
...Bulging part, 3, 3'...Step part, 4, 4'...Mounting member, 6°6'...Space, 7, 7'...Opening.

Claims (1)

[Claims] 1. A mounting member is anchored in a cylindrical shape in the circumferential direction of the joint on each of the inner peripheral surfaces of the ends of a pair of opposing cylindrical pipes to be connected, so that the inner peripheral surface of the pipes and the outer circumference of the mounting member A space is provided between the two pipes, and the space is elongated in the axial direction of the joint and has an opening narrowed at the opposite end on the public road side. a bulge, the height of the bulge is greater than that of the space, and the length of the space in the longitudinal direction is greater than the length of the bulge; A short cylindrical flexible member with both ends connected in a straight line is installed across both government roads with the bulge inserted into the space. Pipe fittings.