JPS6178932A - Joint structure of water channel - 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 (Field of Industrial Application) The present invention relates to a joint structure for industrial waterways, drainage channels, etc.

(Prior Art) A waterway is constructed by sequentially connecting a required number of concrete products with various cross-sectional shapes, such as U-shaped, cylindrical, and prismatic cylindrical shapes, depending on the purpose and location of the waterway.

Special Publication No. 57-1665 as a powerful joint structure for this purpose.
The eccentric seat plate type joint structure proposed in the publication has a through hole at each end of the two upper and lower connecting plates, and stoppers protruding from the inside and outside of one of the through holes or on both sides. A nut-shaped insert is buried in each joint end of the upright wall of the product, a connecting plate is fitted into the four opposed parts of two adjacent products, and a bolt is screwed into the nut-shaped insert from the through hole to connect each of the products. The plate is fastened to the concrete product, and the eccentric seat plate is fitted onto the bolt that passes through the through hole on the stopper side, and when the two adjacent concrete products are brought into close contact with each other and the regular sealing material is sufficiently compressed, Its peripheral surface is brought into contact with the inner surfaces of the one or two stoppers.

(Problems to be Solved by the Invention) As described above, in the conventional eccentric seat plate type joint structure, the connecting plate, eccentric seat plate, two nut-shaped inserts, and two tightening bolts are essential parts. These parts, which bear the compressive and tensile stresses that act on the joints when subsidence or uplift occurs in the waterway, must be made of materials with high mechanical strength, shape, structure, and wall thickness, which reduces material costs. However, the manufacturing and processing costs are inevitably high, which cannot be ignored compared to the price of the concrete product itself.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an eccentric seat plate type joint structure that can reduce manufacturing costs by reducing the number of component parts and employing lower-rank parts.

(Means for Solving the Problems) The following will explain based on the drawings. The gist of the joint structure of the present invention is that the connecting plate 1 is embedded and fixed in the joint end of the concrete product 5 at the time of molding. It is.

(Embodiment) In the illustrated embodiment, rectangular recesses 8.9 are provided at corresponding positions δ on the outer wall surface of each joint end at the front and rear ends of the concrete product 5, and at the center of the bottom surface of the recess 8 at the front end. In this case, a nut-shaped insert 6 is embedded.

This nut-shaped insert 6 is welded and fixed to an anchor plate 7 that is embedded and fixed in the joint end portion during molding of the concrete product 5. This anchor plate 7 is made of a striped steel plate, and its tip 7a is exposed to the four parts 8.

The connecting plate 1 is exposed in the recess 9 at the rear end, and the anchor portion 1a is embedded and fixed in the joint end when the concrete product 5 is molded. The through hole 3 provided at the tip of the connecting plate l is an elongated hole to provide adjustment margin, but this is not limited to a horizontal elongated hole, and may be an oblique hole. It may also be a round hole into which the neck of the lO fits loosely. The two stoppers 4a and 4b are formed of vertically long protrusions. In this example, the fastener 10 is a bolt.

When constructing the waterway, the concave part 8 of one concrete product
The connecting plate 1 of the other concrete product 5 is fitted into the connecting plate 1 of the other concrete product 5. The bolt 10 screwed into the nut-shaped insert 6 from the through hole 3 is initially temporarily tightened. Standard sealing material 1 preset in the groove 14 at the center of the joint end face at the factory or installation site.
5 of one concrete product until 2 is well compacted.
is pressed onto the other concrete product 5.

In this example, the tip 1b of the connecting plate 1 is inclined or curved outward, so the tip tb first comes into sliding contact with the edge of the recess 8 and then with the side surface of the anchor plate 7. , serves as a suitable guide means. Therefore, the concrete product 5 can be installed accurately with a high plowing rate.

At the stage where the adjacent concrete products 5.5 are brought into close contact with each other in this way, the eccentric seat plate 11 is appropriately rotated about the aforementioned pole 10 fitted into the eccentric shaft hole 13 as a central axis, and a part of its circumferential surface is rotated. It is brought into contact with the side surface of each stomper 4a, 4b. After this work is completed, the bolt 10 is fully tightened.

Note that, contrary to this example, a bolt-shaped insert may be embedded in a concrete product, and the concrete product may have various cross-sectional shapes such as a U-shape, a cylindrical shape, and a rectangular tube shape. Further, in this example, two connecting plates, upper and lower, are used, but the number of connecting plates used can be increased or decreased as appropriate depending on the height and size of the concrete product, and the stopper may be provided only on one side.

In this eccentric seat plate type joint structure, when subsidence occurs in the waterway, the compressive stress in the upper part is borne by the upper connecting plate 1, the stopper 4a inside thereof, the eccentric seat plate 11, and the pole 10, and the tensile stress in the lower part is the lower connecting plate 1
, its outer stopper 4b, eccentric seat plate 11 and pole)
10. On the other hand, when an upheaval occurs in the waterway, the upper tensile stress is borne by the upper connecting plate 1, its outer stop bar 4b, the eccentric seat plate 11, and the bolt, and the lower compressive stress is borne by the lower connecting plate, its inner side. The load is borne by the stopper 4a, the eccentric seat plate 11, and the bolts 2 and 3.

In this way, compressive stress and tensile stress in both subsidence and uplift are handled by connecting plate 1 with a stomper and eccentric seat plate 1.
Because the load is accurately applied by the concrete product, the edges of the concrete product may buckle or collapse, or excessive joint separation may occur.
According to the embodiment, a joint structure is obtained that does not lose its function as a water channel, and has sufficient resistance to both subsidence and uplift.

Furthermore, in this example, the diameter-expanding recess 15 is provided at the front end of the nut-shaped insert 6, and the unthreaded shaft portion 10a of the bolt 10 is fitted into this, so that the shear stress applied to the bolt 10 is The burden will be borne by the department 10a.

In conventional joint structures, the bolt had a thread cut along the entire length of the shaft, so when calculating strength, the root diameter of the thread had to be used as the basis for calculation. Calculating the strength using the root diameter in this way results in a cross-sectional loss of 20% or more with respect to the nominal diameter, making it necessary to use a bolt one rank higher.

On the other hand, in this example, since the stress is borne by the shaft portion 10a as described above, the strength calculation can be performed using the diameter of the shaft portion 10a instead of the root diameter of the screw shaft portion lOb. Thus, 1
Even lower-ranked bolts can be used, which results in a reduction in bolt material costs.

In the embodiments shown in FIGS. 5 to 7, the anchor plate 7 and the connecting plate l have through holes 16 and grooves 1 in the main body portion or the tip portion to be buried in the concrete product 5.
7. Inward cut and raised protrusions 18, outward cut and raised protrusions 19, and inward or outward bent protrusions 20 are provided, thereby increasing the bonding strength between the anchor plate 7 or the connecting plate l and the concrete product 5. ing.

(Effects of the Invention) As described above, in the eccentric seat plate type joint structure of the present invention, the connecting plate is buried and fixed at the joint end of one concrete product, and it is not necessary to separately use bolts and nut-shaped inserts as in the past. Since there is no need to fasten the connecting plate l to the concrete product, the number of component parts is reduced accordingly, and manufacturing costs can be reduced.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view of a water channel employing an eccentric seat plate type joint structure before connection, and FIG. 2 is a front view of a main part of the water channel after connection. 3 is a cross-sectional view taken along the line A--A in FIG. 2, and FIG. 4 is an enlarged cross-sectional view of the nut-shaped insert and the port portion. FIG. 5 is a perspective view of an anchor plate in another embodiment of the present invention, FIG. 6 is a perspective view of a connecting plate in another embodiment of the present invention, and FIG. 7 is an anchor in yet another embodiment of the present invention. It is a longitudinal cross-sectional view of a plate.

Claims (1)

[Claims] An eccentric seat plate is fitted into a fastener that is inserted into a through hole provided at the end of the connecting plate and fastens the connecting plate to the joint end of two adjacent concrete products, and a stopper protruding from the connecting plate is inserted. A waterway joint structure characterized in that, in an eccentric seat plate type joint structure in which the circumferential surfaces of eccentric seat plates are brought into contact with each other, a connecting plate is buried and fixed in the joint end of one concrete product.