JP2582806Y2 - Stress concentration relief structure of radial gate foundation material - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base material for rotatably holding a radial gate provided in a water discharge channel of a concrete dam, and particularly to a stress at an end of a supporting girder embedded in concrete among the base materials. Concentration relief structure.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 2, a radial gate 2 is provided in a water discharge channel 1a of a concrete dam 1, and this radial gate 2 is a front surface of a bearing girder 3 which constitutes a part of a base material. Is mounted so as to be rotatable.
As shown in FIGS. 3 and 4, the bearing girder 3 is composed of a steel box (or I) girder, is embedded in the concrete forming the concrete dam 1, and supports the hydraulic load received by the radial gate 2. It can be distributed and transmitted to the concrete part via the pressure girder 3. The end 4 of the conventional bearing girder 3 is formed in a shape having a corner (see FIG. 4). Reference numeral 3a in FIGS. 2 to 4 denotes a pivot for pivotally connecting the rear end of the arm 2a of the radial gate 2 to the front surface of the supporting girder 3.

[0003]

However, in the above-described conventional device, when a hydraulic load is applied to the end of the supporting girder, the end has a shape having corners. There is a problem that stress concentration occurs in the concrete and causes cracks in concrete. When a load is applied, the supporting girder tends to deform (bounce) to the opposite side to the water flow direction due to its structural characteristics. Become.

[0004] The present invention is intended to solve such a problem. Among the basic materials of the radial gate, an end of a bearing girder buried in concrete of a concrete dam is formed in an arc shape. Further, it is an object of the present invention to provide a structure for relieving stress concentration of a radial gate base material, in which a filler is injected into the periphery thereof to reduce stress concentration on a concrete portion.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a structure for alleviating stress concentration of a radial gate foundation material according to the present invention includes a foundation for rotatably holding a radial gate provided in a water discharge channel of a concrete dam. The supporting girder comprises a steel girder member and is buried in the concrete of the concrete dam. The supporting girder has an end formed in an arc shape and is filled around the supporting girder. The material is injected.

[0006]

In the above-mentioned structure for alleviating the stress concentration of the radial gate base material of the present invention, the end of the bearing girder is formed in an arc shape to reduce the stress concentration, which leads to the suppression of concrete cracking. . In addition, the filler prevents the end of the supporting girder from directly contacting the concrete and acts as a cushioning material against the deformation of the end of the supporting girder, such as the rising of the concrete. To prevent.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view (corresponding to FIG. 4) of a structure for alleviating stress concentration of a radial gate base material according to an embodiment of the present invention.
In FIG. 1, the same reference numerals as those in FIGS. 2 to 4 indicate substantially the same members. The bearing girder 3 of this embodiment is also composed of a steel box girder and is buried in the concrete of the concrete dam 1 to constitute a part of the base material of the radial gate. The rear end of the arm 2a of the radial gate provided at 1a is rotatably mounted via a pivot 3a.

Each end 6 of the supporting girder 3 has a radius R
, And a filler 7 is injected around the arc. As the filler 7, for example, a tar epoxy resin (synthetic resin) or the like is suitable. With the above configuration, that is, by forming the end portions 6 of the bearing girder 3 in an arc shape, stress concentration on the concrete at the end portion of the bearing girder 3 can be reduced. Further, by injecting the filler around the supporting girder 3, it is possible to absorb the deformation (bending deformation) of the end of the supporting girder 3, and these effects are combined to support the supporting girder 3. Cracking of the concrete around the end of the girder can be reliably suppressed.

[0009]

As described in detail above, the following effects and advantages can be obtained by the stress concentration relieving structure of the radial gate base material of the present invention. (1) By making the ends of the supporting girder arc-shaped, stress concentration on the concrete at the end of the supporting girder can be reduced. (2) By injecting filler around the bearing girder,
Even if a load is applied to the supporting girder and its end is deformed by jumping to the side opposite to the load direction, this deformation can be absorbed by the filler. (3) According to the above (1) and (2), there is an advantage that cracking of concrete around the end of the bearing girder can be surely suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure for alleviating stress concentration of a radial gate base material as one embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional radial gate together with a concrete dam.

FIG. 3 is an enlarged sectional view showing an arrow A portion in FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 3 and corresponding to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete dam 1a Floodway 2 Radial gate 2a Radial gate arm 3 Bearing girder 3a Axis 4,6 End 7 Filling material

Claims (1)

(57) [Scope of request for utility model registration] A base material for rotatably holding a radial gate provided in a water discharge channel of a concrete dam,
It has a bearing girder composed of steel girder members and buried in the concrete of the concrete dam, the end of the bearing girder is formed in an arc shape, and a filler is injected around the bearing girder. The stress concentration relieving structure of the radial gate base material, characterized in that it is made.