JPS6183732A - 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 agricultural waterways, drainage canals, and the like.

(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.

In the bolt connection type joint structure disclosed in Japanese Patent Publication No. 57-1665, through-holes are provided at each end of the two upper and lower connecting plates, and a stopper is provided protruding from the side of one of the through-holes. A nut-shaped insert is buried in each joint end of the concrete product, a connecting plate is inserted into the facing recess of two adjacent products, and a bolt is screwed into the nut-shaped insert through the through hole to connect each connecting plate to the concrete product. The circumferential surface of the eccentric seat plate fitted on one of the bolts is brought into contact with the side surface of the stopper in a state in which the regular sealing material between adjacent concrete products is compressed.

(Problem to be solved by the invention) In this bolt-connected joint structure, the tightening bolt is an indispensable part along with the connecting plate and Nand type insert, and when subsidence or uplift occurs in the waterway, the joint In order to bear the compressive stress and tensile stress of 1 movement, it is necessary to use a material with high mechanical strength, shape, W construction, and wall thickness.

Bolts used in conventional joint structures had threads cut across the entire length of the shaft, so when calculating strength, the root diameter of the thread had to be used as the basis for calculations. When strength is calculated based on the root diameter in this way, there is a cross-sectional loss of 20% or more relative to the nominal diameter, and a bolt one rank higher must be used, resulting in higher material and manufacturing costs.

Accordingly, an object of the present invention is to provide a port connection type joint structure that allows the use of bolts one rank lower by changing the nut-type insert and the port shape, thereby reducing manufacturing costs.

(Means for Solving the Problems) The gist of the joint structure of the present invention will be explained below based on the drawings. Diameter recess 15
A non-threaded shaft portion 10a is provided on the bolt lO which is screwed into the nut-shaped insert 6 from the through hole 3 at the end of the connecting plate 1, and the non-threaded shaft portion 10a is fitted into the enlarged diameter recess 15. That's what I did.

(Embodiment) In the embodiment shown in FIGS. 1 to 4, rectangular recesses 8.9 are provided at corresponding positions on the outer wall surface of each joint end at the front and rear of the concrete product 5. At the bottom of the recess 8 at the front end, the tip 7a of the anchor plate 7 buried during molding of the concrete product 5 is exposed, and the nut-shaped insert 6 is welded and fixed to the back surface of the tip 7a.

The connection plate 1 is exposed in the recess 9 at the rear end.

This anchor portion 1a is buried and fixed in the joint end portion during molding of the concrete product 5. The through hole 3 provided in the exposed main body portion of the connecting plate 1 is a horizontal long hole in order to provide adjustment margin, but it may also be a diagonal long hole or an arcuate long hole. The leading edge of the connecting plate 1 is provided with an outwardly inclined or curved guide portion 1b, which may be a round hole into which the shaft portion of the connecting plate 1 loosely fits.

When constructing a waterway, the connecting plate 1 of the other concrete product 5 is fitted into the recess 8 of one concrete product, and the bolt 10 is pre-tightened at the factory or installation site into the groove 14 in the center of the joint end surface, which is initially temporarily tightened. Set standard seal material 1
5 of one concrete product until 2 is well compacted.
is pressed against the other concrete product 5,
The eccentric seat plate 11 is appropriately rotated around the bolt 10 fitted into the eccentric shaft hole 13, a part of its circumferential surface is brought into contact with the side surfaces of the vertically protruding stoppers 4a and 4b, and finally the bolt 1 is rotated.
0 is fully tightened.

In this example, two upper and lower connecting plates are used, so when subsidence occurs in the waterway, the compressive stress in the upper part is applied to the upper connecting plate 1, the stopper 4a inside it, and the eccentric seat plate 11.
The lower tensile stress is borne by the lower connecting plate 1, the stopper 4b outside thereof, the eccentric seat plate 11, and the bolt 10. On the other hand, when a bump occurs in the waterway, the upper tensile stress is borne by the upper connecting plate 1, the stopper 4b outside it, the eccentric seat plate 11, and the bolt, and the lower compressive stress is borne by the lower connecting plate and the inner stopper. 4a, eccentric seat plate 11
and borne by bolts 2 and 3.

In the embodiment shown in FIGS. 5 to 7, the anchor plate 7 and the connecting plate 1 have through holes 16 and grooves 17 in the main body portion or tip portion to be embedded in the concrete product 5.
Inward cut and raised protrusions 18, outward cut and raised protrusions 19, inwardly bent protrusions 20, and outwardly bent protrusions 21 are provided, thereby connecting the anchor plate 7 and the connecting plate 1 to the concrete product 5. increasing strength.

In the embodiment shown in FIG. 8, the connecting plate 1 is not buried and fixed in the joint end portion during molding of the concrete product 5, and the anchor plate 7 is not used.

Nut-shaped inserts 6 are directly embedded and fixed in the bottoms of recesses 8.9 at the front and rear joint ends of the concrete product 5, and required anchor reinforcements 22 are welded and fixed to each nut-shaped insert 6. Connection plate 1 is concrete product 5
By screwing the bolts 10 from the through holes 3 into each of the seven-piece inserts 6 when connecting the concrete products 5.
It is fastened and fixed to the front and rear joint ends of.

An eccentric seat plate 11 is fitted to one of the two bolts 10 through the eccentric shaft hole 13, as in the embodiment described above, and the through hole 3 through which the bolt 10 is inserted also has an adjustment margin as in the embodiment described above. It is formed so that it comes out.

Incidentally, contrary to this example, the bolt-shaped insert can also be buried in a concrete product, and the concrete product can have various cross-sectional shapes such as a U-shape, a cylindrical shape, and a rectangular tube shape. In addition, 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. The present invention can be applied to a joint structure in which the eccentric seat plate 11 is not used, and the connecting plate is fastened to a concrete product using two sets of nut-shaped inserts and bolts or bolt-shaped inserts and nuts.

(Effects of the Invention) As described above, in the bolt-connected joint structure of the present invention, the diameter-expanding recess 15 is provided at the front end of the nut-shaped insert 6, and the unthreaded shaft of the bolt 10 is inserted into the diameter-expanding recess 15. Part 1
Since the bolts 0a are fitted together, the shear stress applied to the bolt 10 is borne by the non-threaded shaft portion 10a.

Therefore, various strength calculations of the bolt 10 can be performed using the diameter of the non-threaded shaft portion 10a rather than the root diameter of the threaded shaft portion fob, so that a bolt one rank lower can be used satisfactorily. This saves bolt material costs.

[Brief explanation of the drawing]

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 sectional view taken along the line A--A in FIG. 2, and FIG. 4 is an enlarged sectional view of the nut-shaped insert and bolt 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. FIG. 8 is a cross-sectional view of a main part of a water channel joint in still another embodiment of the present invention.

Claims (1)

[Claims] It is inserted into the through hole 3 at the end of the connecting plate 1, and the adjacent 2
In a bolt-connected joint structure in which the connecting plate 1 is fastened to the joint end of two concrete products 5 by bolts 10 screwed into the nut-type insert 6 at the joint end of the two concrete products 5, the front end of the nut-type insert 6 A diameter-enlarged recess 15 is provided in the diameter-enlarged recess 15, and a bolt 10 is inserted into the diameter-enlarged recess 15.
A joint structure of a waterway into which a non-threaded shaft portion 10a is fitted.