JPS60256696A - Precast concrete box culvert - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is suitable for forming pipes such as sewers and underground passages.
This relates to a precast concrete box culvert that is fitted and connected using a rubber gasket.

[Problems to be solved by the present invention] This type of precast concrete box culvert with a fitting connection type has a protruding ring portion for insertion provided on one side opening surface and a concave ring portion for receiving provided on the other side opening surface. Both joint surfaces are square in front view, so when applying a rubber gasket to the outer surface of the protruding ring and press-fitting it into the concave ring, the rubber gasket should be bent at right angles at the four corners. There is a risk of cracking or tearing, and the rubber gasket located between each flat surface between the four corners may come loose from the outer surface of the protruding ring, causing twisting or misalignment during press-fitting, resulting in water leakage, etc. It is desired that these problems be improved.

[Purpose of the invention]

This invention improves the protruding ring part and the receiving concave ring part so that the rubber gasket can be tension-fitted without folding or creating a loose part, and is press-fitted between the fitting culverts. The goal is to solve problems.

+1 [Structure of the Invention] This invention relates to a precast concrete box culvert of the type that is fitted and connected, in which a protruding ring portion provided on one side opening surface of the box culvert and a receiving concave ring portion provided on the other side opening surface are opposed to each other. The fitting surface is formed into an arc-shaped curved surface that bulges outward, and a rubber gasket is tension-fitted to the outer surface of the protruding ring portion, so that it is compressed and interposed between the fitting culverts.

〔Example〕

Examples will be described below based on the drawings. A precast concrete box culvert 1 is provided with a protruding ring part 3 for insertion on one side opening surface 2.

The inner surface 4 of the protruding ring portion 3 coincides with the inner wall of the culvert 1, and the outer surface 5 has four corners formed into arcuate curved surfaces 5a.
Each transparent surface between the four corners is formed by an outwardly bulging curved surface 5b, and the entire circumference of the outer surface 5 is formed into one deformed circular shape. Note that 6 is an intermediate step surface that holds the rubber gasket 7. , the other side opening surface 8 of the culvert 1 forms a concave ring part 9 for receiving the above-mentioned protruding ring part 3, and the inner surface 10 of the concave ring part 9
The outer wall 11 of the concave ring part 9 is formed in a similar deformed circular shape at a constant distance from the outer surface 5 of the protruding ring part 3. The rubber gasket 7 is formed in the shape of a narrow strip with a circular cross section, and is fitted by tightening the outer surface of the protruding ring portion 3 while turning it and tightening the end portions. One surface of the rubber gasket 7 is brought into contact with the stepped surface 6. Since the outer surface 5 of the protruding ring portion 3 is formed into an irregular circular shape including the four corners, the rubber gasket 7 will not break at the four corners, and each transparent surface between the four corners will not bend along the curved surface. This prevents looseness due to tension in the attachment. Next, the culvert with the rubber gas foot fitted is the culvert l that has already been installed.
The outer surface of the rubber gasket 7 is pressed against the outer wall 11 of the concave ring part 9 during this process, and the rubber gasket 7 is compressed and fitted. It will be interposed between the mating joints.

〔Effect of the invention〕

As described above, according to the present invention, even in a box-shaped culvert, it is possible to fit a rubber gasket with tension around the entire circumference, eliminating cracks and tears that would otherwise occur at the four corners due to hooking. This prevents the rubber gasket from coming loose on each transparent surface between the four corners, so it eliminates twisting and misalignment of the rubber gasket when fitting and connecting the culvert, ensuring reliable compression. This has the effect of eliminating water leaks, etc.

[Brief explanation of the drawing]

Figure 1 is a side view, Figure 2 is a front view of the protruding ring side, Figure 3 is a front view of the concave ring side, Figure 4 is a partially enlarged sectional view of the fitting connection, and Figure 5 is the conventional , a front view showing an example of how the protruding ring part and the rubber gasket are fitted, l is a precast concrete box culvert, 2 is an opening on one side, 3 is a protruding ring part,
4 is the inner surface of the protruding ring, 5 is the outer surface, 6 is the intermediate step surface, 7 is the rubber gasket, 8 is the opening surface on the other side, 9 is the concave ring, 10 is the inner surface of the concave ring, 11 is the same , on the exterior wall 0 Patent applicant: 1 person other than Nippon Zenith Vipe Co., Ltd.

Claims (1)

[Claims] (1) In a precast concrete box culvert of the type that connects by fitting, the protruding ring part for insertion provided on one side opening surface of the culvert and the fitting surface of the recessed ring part for receiving provided on the other side opening surface, respectively. The rubber gasket is formed with an outwardly bulging arcuate curved surface, and the rubber gasket is tension-fitted along the outer surface of the arcuate curved surface of the protruding ring part, so that it is compressed and interposed between the fitting culverts. Brecast concrete box Calpert.