JPH0218134Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> This invention relates to the structure of the joints of concrete pipes.

<Problems that this invention attempts to solve> The use of fitting and connecting concrete pipes or concrete culverts using rubber rings has already been practiced since 1973.
It is known from Publication No. 33416 and No. 51-69113, etc., but the lower part of the rubber ring is compressed excessively compared to other parts due to the concentration of the load of both pipes, so it is difficult to fit. There is a height difference between the inner bottom surfaces of the parts where the male end side is lower, causing problems such as water stagnation and sediment stagnation. The present invention attempts to solve these problems.

<Structure of the device> The present device embeds a plurality of metal fittings with vertical screw holes at intervals in parallel with the rubber ring on the lower side of the male end of the rubber ring provided on one side of a concrete pipe or concrete culvert. , a bolt receiving groove is provided on the flange under the female end of the male end holder provided on the other side, and after the male and female ends are fitted, a bolt is screwed into each of the metal fittings, and the lower side of the male end is secured by the bolt. The joint structure of a concrete pipe culvert is characterized in that the inner bottom surface of the connecting portion is adjusted so that its inner bottom surface is flush with the inner bottom surface of the female end.

<Example> Examples will be described below based on the drawings.

A culvert 2 (hereinafter simply referred to as a concrete pipe 3), such as a concrete pipe 1 or a concrete box type, is made with a rubber ring 4 on one side using a forming mold.
It is manufactured by providing a hooked male end 5 and a concave ring-shaped female end 6 for receiving the male end on the other side, and a female threaded hole 7 on the base side parallel to the rubber ring 4 in the lower side 5a of the male end 5. Three adjusting hardware 8 vertically installed in the center are embedded and installed at intervals. Note that 9a and 9b are reinforcing wings, and 10 is a recess into which a bolt head is inserted. Further, three bolt receiving grooves 12 are provided at the tip of the upper surface of the protruding flange 11 below the female end 6.

A rubber ring 4 is hooked to a predetermined position of the male end 5, and the female end 6 of the next concrete pipe culvert 3 is fitted. Then, the lower side 4a of the rubber ring 4 is excessively compressed by the load, and a step is formed between the inner bottom surfaces 13a and 13b of the male and female ends, with the male end being lower. The vertical movement is adjusted using the circumferential bolt 14 to make the same plane. That is, the tip of each bolt 14 to be screwed reaches the receiving groove 12, but when screwed in further, the lower side 5a of the male end 5 moves upward by the screwed-in amount using the receiving groove 12 as a fulcrum, and the inner bottom surface 13
The space between a and 13b is the same plane with no difference in level. The bolt head 14a is located within the recess 10, and is filled with cement mortar 15 or the like after adjustment.

<Effects of the invention> As described above, the present invention eliminates the height difference at the lower side between concrete pipes that was caused by fitting the rubber ring, so the rubber ring can be compressed evenly around the entire circumference. This creates a leak-free connection, and even when external pressure is applied to the connection, the height adjustment bolt receives the load and does not affect the bottom of the rubber ring, and the tip of the bolt Since the pipes fit into the recesses, it is possible to prevent displacement between the pipes. Furthermore, since the inner bottom surfaces between the pipes are on the same plane with no steps, there is an effect of eliminating stagnation of stagnant water and sediment.

[Brief explanation of the drawing]

Figure 1 is a front view showing the main parts of a concrete box culvert, Figure 2 is a front view of the concrete pipe, and Figure 3 is an enlarged sectional view of the main parts. 1 is a concrete pipe, 2 is a concrete box culvert, 3 is a concrete pipe, 4 is a rubber ring, 5 is a male end, 6 is a female end, 7 is a female threaded hole, 8 is hardware for adjustment, 9a, 9b are wing pieces for reinforcement, 10 is a recess, 11 is a collar , 12 is a receiving groove, 13a, 13b
14 is an inner bottom surface, 14 is a bolt, and 15 is a filling layer such as cement mortar.

Claims (1)

[Scope of utility model registration request] A plurality of metal fittings with vertical screw holes are installed at intervals parallel to the rubber ring on the lower side of the male end of the rubber ring provided on one side of the concrete pipe or concrete culvert, and the male end provided on the other side. A bolt receiving groove is provided on the flange below the female end of the receiver, and after the male and female ends have been fitted, bolts are screwed into each of the metal fittings, and the bolts connect the lower side of the male end with the inner bottom surface of the female end. A concrete pipe connection structure characterized by adjusting the operation so that it is flush with the inner bottom surface of the concrete pipe.