JPS6128608A - Raising dam with rising and falling weir - Google Patents

Abstract

PURPOSE:To reduce resistance produced when water over-flows during fall-down, by a method wherein lamination of elastic films at the joint point of the revetment of a dam with a curve foundation is such that the threads in the direction of a flow of the film material on the revetment part are cut to join it with the film material of a foundation part. CONSTITUTION:A body carpet 4 is shaped in conformity with a curve 5 of a d dam foundation 1 to form a curve 6 produced during fall-down. The carpet 4 on both a revetment part 2 and a foundation part 1 are joined in a direction extending parallel to a flow, and joining at a cross part therebetween is such that the threads in the direction of a flow of the carpet on the revetment part 2 are cut and said carpets 4 are respectively joined with the carpets on the foundation part 1 having threads in the direction of a flow being not cut. Thus, the carpet 4 is shaped such that the curve 6 of a corner part coincides with a cuuve 5 of the dam foundation. This prevents rising and falling weir in a fall-down condition from impediment to flow water, and enables an extroadinary force to be prevented from being exerted on the titled weir in a fall-down condition.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a dam equipped with a raised relief weir.

(Prior Art) Raising concrete dams has recently been reconsidered because it can increase the amount of water stored. The simplest means of raising the height of this high dam is to use an undulating weir made of a flexible material, for example rubberized cloth.

As shown in Figure 1, a high dam generally consists of a foundation (1) and a seawall (2) (basement). To install the undulating weir made of flexible material on this, first the foundation (1) and the revetment (2) are installed.
) and drive the anchor bolt (3) into the hole. When the anchor bolts (3) that have been driven are used to form a covering (bag-like body), that is, an undulating weir, the main body force - the propeller l- (41) is fixed on the upstream and downstream sides, the main body carpet is attached, and an undulating weir is formed. .In Figure 1, means for injecting and discharging fluid (for example, air, water, etc.) as a pressure medium for expanding the envelope are omitted.
These steps are carried out in a well-known manner (see, for example, Japanese Utility Model Publication No. 413-3458).

(Problem to be solved by the invention) However, this attached body force - propeller) - (41 is the first
Unlike the case where the conventional undulating weir is installed horizontally at part A in the figure, the problem was how to relate it to the curved part of the dam foundation (1).

Generally, the width of the flexible membrane material is limited, and the envelope (bag-like body) is manufactured by pasting these membrane materials together. This seam is the second
This is (7) in the figure. Moreover, the strength of this flexible membrane material is in the direction parallel to the bonding seam (7) and in the direction perpendicular thereto.

(Means for Solving the Problems) As a result of examining the relationship with the basic curve, the inventor of the present invention found that the shape of the undulating weir when it is collapsed is better than the shape when it is inflated, that is, as shown in Fig. 2.
As shown in the detailed view of part A in Figure 1, the main carpet (4) is aligned with the curve (5) of the dam foundation (1) at the time of collapse (6).
). In other words, the installation shape of the carpet main body (4) is the curve (6
) and the curve (5) of the dam foundation must be shaped to almost match.

In order to achieve this shape, the carpet is pasted on both the seawall and the foundation in a direction parallel to the flow, and when pasting the intersection lines, the threads in the flow direction of the seawall are aligned as shown in Figure 2. shall be cut and laminated with the base carpet without cutting the threads in the machine direction.

(Function) This shape has some problems when expanded (expanded shape), but it is unavoidable in order to reduce the resistance when water overflows during collapse.

(Effects of the Invention) In the present invention as described above, the undulating weir in the collapsed state does not serve as a protection against running water, and no abnormal force is applied to the undulating weir in the collapsed state.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a dam equipped with a raised undulating weir according to the present invention, and FIG. 2 is an enlarged perspective view of a portion A circled in FIG. 1. (1)...Foundation of the dam, (2)...Dam revetment (legal section), (3)...Anchor bolt, (4)...Wrap (carpet), (5) ...Curve of dam base, (6) ...Curve (7) ... Seam of flexible membrane, t 1 Fig. O 2 Fig.

Claims (1)

[Claims] (1) In a case where an envelope made of a flexible material is attached to a dam, fluid is injected into the envelope to cause it to expand and stand up, and the fluid is discharged from the interior of the envelope to cause it to contract and fall down. In order to match the attachment shape of the envelope to the shape of the junction between the dam's revetment and the curved foundation at the time of collapse, we cut the threads in the flow direction of the revetment to attach the flexible membrane material in this area. A dam equipped with a raised undulating weir, characterized in that the threads are laminated with a membrane material of the foundation that does not cut.