JPS6145260Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a simple waterproof expansion joint, and more specifically to a simple waterproof expansion joint that connects concrete frames having quadrilateral, circular, polygonal, etc. cross sections. It is.

For example, in order to construct water and sewage systems, agricultural or industrial waterways, a concrete frame called a box culvert with a four-sided concrete cross section is manufactured in a factory and transported to the construction site and buried, or it is carried out on-site. In some cases, a frame may be formed and buried. For example, this frame has a side of 2m.
It is relatively large, approximately 5m in length and around 2m in length, and a continuous waterway is formed by connecting many of these frames one after another.

In order to form such a waterway, the frames should be connected in a watertight manner, and they should be joined with expandable joints in order to prevent uneven subsidence from occurring underground and the waterway meandering. There must be.

As a joint that meets such requirements, a structure is conventionally known in which a bellows-shaped annular rubber band is attached to a connecting portion in a state in which it is inserted or stretched between adjacent frames.

However, if only such rubber bands are used, because waterways are often buried, large water pressure is often applied, and the rubber bands undergo large elastic deformation and protrude into the frame, unable to withstand the water pressure. The drawback is that they eventually break, allowing groundwater, sewage, etc. to enter the waterways.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional method, and has as its object to provide a simplified waterproof expansion joint with an extremely simple structure that is fully capable of withstanding water pressure and is also fully capable of dealing with elevation differences and meandering in waterways.

Hereinafter, details of the present invention will be explained based on embodiments shown in the drawings. In the figure, the reference numeral 1 denotes a rectangular cylindrical frame made of reinforced concrete, each of which is mass-produced to a standard size. An expansion joint 2 according to the present invention is provided between adjacent frames 1, 1.

A first embodiment of the expansion joint according to the present invention is shown in FIGS. 1-6.

The expansion joint 2 is composed of a pair of left and right support plates 3, 3 and a rubber band 4.

The support plates 3, 3 are formed identically, and a support frame 3a having a U-shaped cross section is integrally formed on one end of each support plate 3, and a sawtooth protrusion 3b is provided at a predetermined position on the other end. It is protruded with pitch. The opening end side edge of the support frame 3a and the outer surface of the protruding piece 3b are in the same plane.

Further, through holes 3c are formed in the support frame 3a at a predetermined pitch.

On the other hand, the rubber band 4 is formed into a bellows shape with a predetermined width as shown in FIG. It is desirable to be present.

As shown enlarged in Fig. 4, the rubber band 4 is fitted into a recess 1a formed around the entire periphery of the inner circumferential surface of the connection between the frames 1, 1. The depth of the recess 1a is approximately equal to the height of the support frame 3a of the support plate 3 plus the thickness of the rubber band 4.

After the rubber band 4 is fitted into the recess 1a, the support frames 3a of the support plates 3, 3 are fitted into the recesses 1a of the frames 1, 1 to be connected, respectively. At this time, the support frame 3a is positioned with its U-shaped open end facing toward the inside of the frames 1, 1, and the outer side wall of the support frame 3a is inserted into the recess 1a as shown in FIG. It is placed against the side wall.

On the other hand, what is indicated by code 5 is an anchor bolt,
The head of each anchor bolt 5 is fitted into the through hole 3c of the support frame 3a of the support plate 3, and the nut 6 is used to tighten the support plate 3.
Fix it in a cantilevered state. Each of the serrated protrusions 3b is fitted between the opposing protrusions 3b.

Note that, as shown in an enlarged view in FIG.
There is a gap between the opposing projecting pieces 3b, 3b.

When fixing this support plate 3, as shown in FIG.
and the bottom surface of the recess 1a. That is, both ends of the rubber band 4 are inserted into the vicinity of the anchor bolt 5 and are clamped and fixed.

Incidentally, the support plates 3, 3 are attached one pair at a time while facing each other with a predetermined gap left between the protrusions 3b, 3b, but as shown in FIG. They are attached with a predetermined distance w between them. This is to prepare for meandering waterways and other issues. Figure 4 shows the frame 1 of the expansion joint of the present invention.
The figure shows the state in which it is attached to the corner of the

After the support plate 3 is fixed in this manner, mortar 7 is filled into the U-shaped support frame 3a so as to be flush with the opening end.

Since this embodiment is configured as described above,
The rubber band 4 is located on the outside and the support plate 3 is located on the inside, and the rubber band 4 prevents rainwater etc. from entering between the frames 1 and 1, and the frame 1 is continuous. Agricultural water or sewerage water flowing through the constructed canals will not leak outside.

In addition, even if large water pressure is applied to the rubber band 4 from the outside, the support plate 3 is placed on the inside, so the pressure applied to the rubber band 4 can be sufficiently received, and the rubber band 4 will not undergo large elastic deformation. The fixing part will not be damaged and leakage will not occur.

Even if the frames 1, 1 expand or contract due to thermal expansion or other reasons, the bellows-like rubber band 4 can expand and contract freely and therefore can follow this, and since the support plates 3, 3 are fixed to the respective frames in a cantilevered state, they can always be located inside the rubber band 4 and function as a support plate simply by moving the protrusions 3b, 3b closer to and farther apart.

Furthermore, even if the waterway meanders up and down or left and right, the rubber band 4 can freely expand and contract, and the support plates 3, 3 can also approach and separate from each other, so that it can follow the waterway unless it is in an extremely bent state.

7 to 9 illustrate another embodiment of the present invention, and in each figure, the same parts as in FIGS. 1 to 6 are designated by the same reference numerals, and their explanation will be omitted.

In the embodiment shown in FIGS. 7 to 9, the support plate 3
Also, the structure of the rubber band 4 is slightly different from the embodiment described above.

That is, the support plate 3 is a support frame 3 having an L-shaped cross section.
d, and a through hole 3c into which the anchor bolt 5 fits is formed in its horizontal portion.

At both ends of the rubber band 4 in the width direction, through holes 4a are formed with the same diameter at positions corresponding to the through holes 3c.

The rubber band 4 having such a structure is fitted into the recess 1a with the anchor bolt 5 fitted into the through hole 4a, and is then attached to the recess 1a, and then the support frame 3d of the support plate is placed on top of it and the anchor bolt 5 is fitted into the through hole 4a. 5 is fitted into the through hole 3c and fixed with a nut 6. In this state, the rubber band 4 is locked to the anchor bolt 5 through the through hole 4a, and the support frame 3
It is attached in a state where it is pressed against the bottom surface of the recess 1a by the horizontal portion d. And the support frame 3d
The space outside is filled with mortar 7.

By adopting such a structure, the same effect as the embodiment shown in FIGS. 1 to 6 can be obtained, and since the rubber band 4 is locked to the anchor bolt 5 through the through hole 4a, it can be further removed. It becomes difficult.

Although the means for attaching the expansion joint of the present invention to the rectangular cylindrical frame has been described above, the same method can be used when attaching the expansion joint to a circular or polygonal cylindrical frame.

As is clear from the above description, according to the present invention, an expansion joint is constructed using a plurality of sets of support plates each consisting of a pair of bellows-like rubber bands and a sawtooth protrusion. Even if large water pressure is applied to the rubber band, it can be supported with the support plate preventing large deformation, there is no leakage due to damage to the rubber band, and it sufficiently absorbs misalignment of the frames. be able to.

[Brief explanation of the drawing]

Figures 1 to 6 illustrate an embodiment of the present invention, in which Figure 1 is a partially cutaway perspective view illustrating how the joint is installed, Figure 2 is a plan view of the expansion joint, and Figure 3 is a plan view of the expansion joint. 4 is a partially enlarged perspective view illustrating the attached state, FIG. 5 is a partially enlarged perspective view of the rubber band, and FIG. 6 is a perspective view of the support plate. , Fig. 7 to Fig. 9 are for explaining other embodiments of the present invention, Fig. 7 is a partially enlarged vertical sectional side view of the attached state, Fig. 8 is a perspective view of the rubber band, and Fig. 9 is a perspective view of the rubber band. It is a perspective view of a support plate. 1...Frame body, 2...Expansion joint, 3...Support plate,
3a, 3d...Support frame, 3b...Protrusion piece, 3c...
Through hole, 4...Rubber band, 5...Anchor bolt, 6...Nut, 7...Mortar.

Claims (1)

[Claims for Utility Model Registration] (1) A rubber band 4 formed in the shape of a bellows with a predetermined width, and a support frame fixed to anchor bolts 5 on the frame side, overlapping both ends of the rubber band 4 in the width direction. 3a, the support plates 3 are formed in the same shape,
It has a plurality of serrated protrusions 3b on opposing sides that fit between the opposing protrusions, and the support plate 3 is attached to the rubber band 4 while being located inside the frame 1. A simple waterproof expansion joint featuring: (2) The support frame 3a of the support plate 3 has a U-shaped cross section, and a plurality of through holes 3c into which the anchor bolts 5 are fitted are formed on the bottom side of the support frame 3a.
2. The simple waterproof expansion joint according to claim 1, wherein the bottom surface of the rubber band 4 is overlapped with both ends of the rubber band 4 in the width direction. (3) The support frame 3d of the support plate 3 has an L-shaped cross section, and a plurality of through holes 3c into which the anchor bolts 5 are inserted are formed in the portions of the support frame 3d parallel to the projections 3b. The simple waterproof expansion joint according to claim 1, wherein the portions in which the through holes 3c are formed are overlapped with both ends of the rubber band 4 in the width direction. (4) The rubber band 4 has through-holes 4a formed at both ends in the width direction with the same diameter and the same pitch as the through-holes 3c of the support frame 3d. Simple waterproof expansion joint described in Section 3.