CN2503113Y

CN2503113Y - Arch dam large differential tooth bank flood discharging structure

Info

Publication number: CN2503113Y
Application number: CN 00251459
Authority: CN
Inventors: 李小榕; 陈敏岩; 杨首龙; 潘炜
Original assignee: FUJIAN PROVINCIAL INST OF WATER CONSERVANCY AND HYDRAULIC POWER PROSPECTING AND
Current assignee: FUJIAN PROVINCIAL INST OF WATER CONSERVANCY AND HYDRAULIC POWER PROSPECTING AND
Priority date: 2000-09-08
Filing date: 2000-09-08
Publication date: 2002-07-31
Anticipated expiration: 2010-09-08

Abstract

The utility model discloses a dentate sill flood drainage structure on arch dam with large differential which combines the flood drainage and energy dissipation organically, therefore, is able to improve the flood discharge capacity, reduce overflow holes and effectively disperse the flood. The utility model is characterized in that: a flip bucket of certain overhang degree and a deep trough flip bucket of depression angle descending along an overflow weir are arranged at tail section of an arc dam overflowing surface to realize that the flood flows to the river channel at backward position with different flipping angles, so as to disperse the water falling points in riverbeds and remarkably reduce the leap of the actual unit discharge of the water entered, thus deducing the scour after the dam.

Description

The big differential tooth bank flood discharge structure of arch dam

The utility model relates to the dam structure with flood discharge function, the big differential tooth bank flood discharge structure of a kind of specifically novel arch dam.

Reservoir is as the important engineering means of agriculture storage irrigation, generating, for the important effect that promotes the well-being of mankind.Gate as reservoir---dam, its effect are not only to regulate flood, reservoir impoundment power generation, the more important thing is when dam wash with watercolours flood discharge water, and its high-velocity flow of having assembled huge water energy can not work the mischief to downstream and dam safety.Particularly in water flow path to concentrating, when dome dam was built in the river valley that the riverbed is very narrow, the flood-discharge energy-dissipating problem of its high-velocity flow was more apparent outstanding.

There are two insoluble problems in conventional arch dam flood-discharge, and the one, the flood discharge problem, the river valley of building arch dam owing to the arch dam flood-discharge flow greatly is narrow relatively again, and the discharge that therefore how to improve arch dam is an outstanding difficult problem; The 2nd, Dissipation of Energy, because radially concentrating of current acts on during arch dam flood-discharge, make the actual discharge per unit width that washes away the riverbed be multiplied than the discharge per unit width at overflow weir place, add that the flood discharge of arch dam downstream forms to dash the hole very near apart from base of dam, the safety that usually threatens dam self.

Interrelated data retrieval according to Chinese patent shows do not have the big differential tooth bank flood discharge structure of arch dam to be used to improve the relevant report of flood discharge capacity as yet at present.

The purpose of this utility model is narrow at the river valley, the engineering that is fit to the construction arch dam provides a kind of to be had flood discharge and energy dissipating combination, both can improve flood discharge capacity, reduce overflow hole number, current are effectively disperseed, the engineering structures that energy distributes in underwater bed and rationalizes during with dam flood-discharge promptly is provided with the big differential tooth bank flood discharge structure of arch dam that bank is chosen at bank and the deep trouth angle of depression of choosing of degree of hanging by the feet.

The purpose of this utility model realizes like this: a kind ofly choose bank and the big differential tooth bank flood discharge structure of arch dam that bank is formed is chosen at the deep trouth angle of depression by arch dam spillwag chute, gate slot, gate and degree of hanging by the feet, it is characterized in that by an arch dam spillwag chute, arch dam spillwag chute afterbody be provided with degree of hanging by the feet necessarily choose bank and prolong overflow weir and under the deep trouth angle of depression choose bank; Be fixed with gate slot above the arch dam, the centre of gate slot is a gate.During flood discharge, the current that open the sluices flow to arch dam through spillwag chute, through the adjusting of tooth bank, make current choose bank and flow to the downstream from choose bank and the deep trouth angle of depression of the degree of hanging by the feet of arch dam top respectively.This moment, current were chosen riverbed downstream with different flip shots angle, and the overflow water-drop point disperses in the riverbed, because of water flow path obviously reduces to the phenomenon of concentrating the actual entry discharge per unit width sharp increase that produces, reduced the purpose of washing away behind the bank thereby reach.

The utility model because the afterbody of arch dam spillwag chute be provided with degree of hanging by the feet choose bank and bank is chosen at the deep trouth angle of depression, the pressure of spillwag chute is obviously descended, thereby flood discharge capacity is obviously improved, can reach the purpose of saving the sluice hole number.In addition, natural tonifying Qi band and the corner trapezoidal three-dimensional-structure that be rounded off of the utility model after because of the tooth bank, its cavitation resistive property is good.Therefore, the utility model can reach the purpose of drafting.

The concrete structure of utility model is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is the utility model full section view.

Fig. 2 is the plan view on the full dam of the utility model.

Among Fig. 1 and Fig. 2 by an arch dam spillwag chute (1), the afterbody of arch dam spillwag chute (1) be provided with degree of hanging by the feet necessarily choose bank (2) and prolong overflow weir and under the deep trouth angle of depression choose bank (3); Be fixed with gate slot (4) and gate (5) above the arch dam spillwag chute (1).Open the sluices during flood discharge (5), water is promptly chosen bank (3) and is flowed to the downstream from choose bank (2) and the deep trouth angle of depression of the degree of hanging by the feet of arch dam top respectively.

Claims

1, a kind ofly chooses bank and the big differential tooth bank flood discharge structure of arch dam that bank is formed is chosen at the deep trouth angle of depression by arch dam spillwag chute, gate slot, gate and degree of hanging by the feet, it is characterized in that by an arch dam spillwag chute, arch dam spillwag chute afterbody be provided with degree of hanging by the feet choose bank and bank is chosen at the deep trouth angle of depression; Be fixed with gate slot above the arch dam, the centre of gate slot is a gate.