JPS6215344Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a joint structure for a precast box culvert.

In the conventional joining of precast box culvert joints, there are problems with poor joining due to factors such as the dimensional accuracy of the product, the condition of the installation surface, and the skill level of the workers. In some cases, the box culvert joint that has been poorly joined has openings, which impairs watertightness and requires time and effort in construction. or,
Even after construction was completed, the occurrence of the above-mentioned openings due to uneven settlement was a problem. This device has a stepped concave engaging surface at one end and a stepped convex engaging surface at the other end in a joint portion of a precast box culvert, in which the engaging surface is inclined. A locking groove is formed at approximately the midpoint of the engagement surface on the convex side of the joint, and a ring-shaped packing made of an elastic member is inserted along the locking groove into a step on the convex side of the joint. It is an object of the present invention to provide a watertight joint which can solve the above-mentioned problems by fitting movably toward the part.

Hereinafter, one embodiment of the precast box culvert of this invention will be illustrated and explained.

The box culvert A has a stepped recess engaging portion 2 at one end and a stepped convex engaging surface 3 at the other end.

The joint part 1 of this precast box culvert has the engaging surfaces 2 and 3 as inclined surfaces, and a locking groove 4 is provided on the convex side of the joint 1 at approximately the midpoint of the engaging surface 3. A ring-shaped packing 5 made of an elastic member is lightly locked along the locking groove 4, which is formed in a notched manner. The packing 5 is made of a cylindrical rubber material having sufficient elasticity and is formed into a ring shape like a rubber band, and has a size that allows it to be locked in the locking groove 4 in a slightly stretched state. It's becoming like that. Kono Packing 5
The convex locking surface 3 is fitted into the concave locking surface 2, and during this fitting, the packing 5 rotates due to friction with the concave engaging surface 2 and engages the convex locking surface 2. It is designed to disengage from the locking groove 4 of the locking surface 3 and move toward the stepped portion 6 of the locking surface 3 (see FIG. 2). The joint part 1 in the fitted state
The packing 5 reliably seals the joint 1 with the stepped portion 6 of the convex engagement surface 3 by the movement, and provides appropriate flexibility to the joint 1, and maintains airtightness even due to uneven settlement etc. It is attached so as not to damage it. The inner peripheral surface of the lower end portion of the joint portion 1 is filled with caulking agent 7, and the joining of the joint portion 1 is completed.

The watertight joint according to this invention is as described above.
It has the following advantages.

(1) Since the packing can be fitted into the locking groove, even non-experts can install it accurately and quickly, making it easy to connect the box culvert.

(2) Since the shearing force acting on the box culvert joint is absorbed by the flexibility of the packing interposed in the joint, a stable structure is obtained and there is no water leakage from the joint.

(3) Rotational movement of the packing ensures smooth joining of the joint and prevents breakage due to contact between concave and convex parts of the joint.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a watertight joint of a box culvert according to this invention, and FIG. 2 is a cross-sectional view showing the joined state of the watertight joint. A...Box culvert, 1...Joint part, 2
...Concave engagement surface, 3...Protrusion engagement surface, 4...Latching groove, 5...Packing, 6...Step, 7...Caulking agent.

Claims (1)

[Scope of utility model registration request] In a joint portion of a precast box culvert having a stepped recessed engagement surface at one end and a stepped convex engagement surface at the other end, the engagement surface is an inclined surface and A locking groove is formed at approximately the midpoint of the engagement surface on the convex side of the joint, and a ring-shaped packing made of an elastic member is placed along the locking groove toward the step on the convex side of the joint. A watertight joint characterized by being movably fitted.