Stilling basin with heightened tail sill

Abstract

The stilling pool is characterized in that a heightened tail sill is arranged on the downstream side of an original tail sill, the original tail sill is located on the downstream side of a dam and an apron, a tail sill top platform is arranged at the top of the heightened tail sill, and heightened side walls are arranged on the basis of original side walls on the outer sides of the two transverse river direction ends of the heightened tail sill respectively; the slope ratio and the transverse river width of the heightened tail sill are kept consistent with the slope ratio and the transverse river width of the original tail sill; the length of the platform on the top of the tail sill in the river direction meets the requirement for arranging the movable flood control baffle and is used for temporarily retaining water when the stilling pool is overhauled. An arc-shaped chamfer is arranged at the turning position of the tail end of the tail sill top platform. On the premise that construction quality is guaranteed, engineering investment is saved, the original energy dissipation effect is not affected, and a dry land environment is provided for maintenance of the stilling pool.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hydraulic structure design and construction technical field, especially a kind of stilling basin of tail sill heightening. BACKGROUND

[0002] The water flow discharged by discharge structure has a large amount of mechanical energy, which can cause strong scouring to riverbed. In order to reduce the damage of water flow to riverbed and foundation of the structure, energy-dissipating and scour-preventing facilities are usually arranged downstream of the discharge structure, and the stilling basin is one of the widely used structures. The stilling basin is prone to structural damage due to the influence of hydraulic scouring and hard material abrasion during operation, and therefore needs to be regularly maintained.

[0003] Due to time constraints and other reasons, part of the newly-built projects do not build maintenance cofferdams during the construction period. For part of the projects that have been in operation for many years, the seepage prevention performance of the maintenance cofferdams is poor due to complex material sources and other reasons, and there are problems such as leakage. The above reasons cause some newly-built or long-operated projects to be unable to provide effective dry land maintenance conditions for the stilling basin when it needs to be maintained. In addition, the construction of maintenance cofferdams has the disadvantages of long construction period, low reusability, and large project investment. SUMMARY

[0004] The utility model aims to provide a stilling basin with tail sill heightening, which provides a dry land maintenance environment for the stilling basin without affecting the original energy-dissipating effect, avoids the construction of maintenance cofferdams during the maintenance period, and saves project investment.

[0005] To this end, the above-mentioned purpose of the utility model is achieved by the following technical solutions:

[0006] A stilling basin with tail sill heightening is arranged on the downstream side of a dam, and includes a apron and an original tail sill arranged in sequence. The original tail sill is provided with a heightening tail sill on the downstream side, the top of the heightening tail sill is provided with a tail sill top platform, and the outer sides of the two ends of the heightening tail sill in the transverse river direction are respectively provided with heightening side walls.

[0007] While the above technical solutions are adopted, the utility model can also adopt or combine the following technical solutions:

[0008] As a preferred technical solution of the utility model, the heightening side walls are connected to the foundation of the original side walls.

[0009] As a preferred technical solution of the utility model, the slope ratio and the width in the transverse river direction of the heightening tail sill are respectively consistent with the slope ratio and the width in the transverse river direction of the original tail sill.

[0010] As a preferred technical solution of the utility model, the length in the river direction of the tail sill top platform meets the arrangement of a movable flood control baffle, which is used for temporarily stopping water during the maintenance of the stilling basin.

[0011] As a preferred technical scheme of the utility model: the tail sill top platform's downstream end of turning is equipped with arc chamfer.

[0012] As a preferred technical scheme of the utility model: the high tail sill is equipped with anchor pile between the foundation.

[0013] The utility model provides a kind of tail sill heightening's stilling basin, high tail sill is set in the downstream side of original tail sill, original tail sill is located in the downstream side of dam and apron, high tail sill top is set tail sill top platform, the lateral river direction both ends outside of high tail sill is set high side wall on the basis of original side wall;The slope ratio and lateral river direction width of high tail sill are consistent with the slope ratio and lateral river direction width of original tail sill;The length of tail sill top platform's downstream meets the needs of arranging movable flood control baffle, is used for temporarily retaining water when stilling basin is overhauled;Tail sill top platform end of turning should be provided with arc chamfer.The utility model can guarantee construction quality under the premise of saving engineering investment, does not affect original energy dissipation effect, provides dry land environment for stilling basin overhaul.

[0014] Specifically, the utility model has the following beneficial effects:

[0015] 1) the utility model makes that stilling basin does not need to build temporary cofferdam during overhaul, saves engineering investment and construction period;

[0016] 2) by keeping original tail sill slope ratio, and in tail sill top platform end of turning should be provided with arc chamfer, guarantee the flow pattern and energy dissipation effect after tail sill heightening, avoid adverse effects on other buildings;

[0017] 3) by setting tail sill top platform, provide installation space for movable flood control baffle, can temporarily retain water during overhaul period, avoid excessive heightening of tail sill, save engineering investment, avoid excessive influence on flow pattern. EXPLANATION OF DRAWINGS

[0018] Figure 1 It is the structure diagram of the stilling basin of tail sill heightening provided by the utility model;

[0019] Figure 2 It is the detailed view of high tail sill, tail sill top platform and arc chamfer;

[0020] Figure 3 It is the underwater construction process diagram of stilling basin tail sill heightening structure under deep tail water condition;

[0021] In the drawing, it is: 1-dam;2-apron;3-original tail sill;4-high tail sill;5-tail sill top platform;6-high side wall;7-arc chamfer;8-temporary cofferdam;9-new and old concrete contact surface;10-underwater concrete top surface elevation line;11-underwater concrete overfilling portion;12-anchor pile. DETAILED DESCRIPTION

[0022] The utility model will be further described in detail with reference to the drawings and specific examples.

[0023] As Figures 1-2 shown, a tail sill heightening stilling basin, the stilling basin is arranged at the downstream side of a dam 1, comprising a apron 2 and an original tail sill 3 arranged in sequence, the downstream side of the original tail sill 3 is provided with a heightening tail sill 4, the top of the heightening tail sill 4 is provided with a tail sill top platform 5, and the lateral river direction both ends outside of the heightening tail sill 4 are respectively provided with heightening side walls 6.

[0024] The heightening side wall 6 is connected with the foundation of the original side wall.

[0025] The slope ratio and lateral river direction width of the heightening tail sill 4 are respectively kept consistent with the slope ratio and lateral river direction width of the original tail sill 3.

[0026] The length of the tail sill top platform 5 in the river direction satisfies the arrangement of a movable flood control baffle, which is used for temporarily stopping water when the stilling basin is overhauled.

[0027] The end of the tail sill top platform 5 in the river direction is provided with an arc-shaped chamfer 7.

[0028] Anchoring pile 12 is arranged between the heightening tail sill 4 and the foundation.

[0029] As Figure 3 shown, the heightening structure of the tail sill of the stilling basin under the above deep tail water condition is constructed by the following ways:

[0030] S1, a water pump is used to pump water in the foundation pit, so that the water level is lowered to below the underwater concrete top surface elevation line 10; the underwater foundation surface of the heightening tail sill 4 at the downstream side of the original tail sill 3 is cleaned, and the underwater block stones and silt are removed as much as possible, so as to ensure that the silt on the new and old concrete contact surface 9 is removed;

[0031] S2, the underwater concrete is poured by using the guide pipe method, so that the guide pipe mouth is tightly stretched to the warehouse bottom under the condition of water isolation, and after the first batch of concrete reaches the warehouse bottom, the guide pipe should be buried in the concrete to a certain depth; during the pouring process, the guide pipe is gradually lifted, so that the block stones and silt that are not removed are extruded and moved to the downstream side temporary cofferdam 8 direction by the concrete; between the heightening tail sill 4 and the temporary cofferdam 8, the underwater concrete top surface elevation line 10 below is the underwater concrete overfilling part 11; the lower end of the guide pipe is always buried in the concrete during the pouring process;

[0032] S3, the normal concrete is poured above the underwater concrete top surface elevation line 10;

[0033] S4, after the pouring is completed, the cementing quality between the newly poured concrete and the foundation should be checked, if the quality does not meet the requirements, then the consolidation grouting should be carried out after the underwater concrete is finally set, and the anchoring pile 12 is arranged by using the grouting hole.

[0034] The above specific embodiments are used to explain and illustrate the present application, and are only preferred embodiments of the present application, rather than limiting the present application. Any modification, equivalent replacement, improvement, etc. made to the present application within the spirit and protection scope of the claims of the present application all fall within the protection scope of the present application.

Claims

1. A stilling basin with a raised tailgate, said stilling basin being arranged on the downstream side of a dam and comprising, in succession, a apron (2) and an original tailgate (3), characterized in that: The downstream side of the original tail sill (3) is provided with a raised tail sill (4), the top of the raised tail sill (4) is provided with a tail sill top platform (5), and the outer sides of the transverse river ends of the raised tail sill (4) are respectively provided with raised side walls (6).

2. The stepped bucket stilling basin according to claim 1, wherein: The raised side wall (6) is connected to the foundation of the original side wall.

3. The stepped bucket stilling basin according to claim 1, wherein: The slope ratio and the transverse river width of the raised tail sill (4) are respectively consistent with the slope ratio and the transverse river width of the original tail sill (3).

4. The stepped bucket stilling basin according to claim 1, wherein: The length of the tail sill top platform (5) in the river direction meets the arrangement of the movable flood prevention baffle.

5. The stepped bucket stilling basin according to claim 1, wherein: The tail sill top platform (5) is provided with an arc-shaped chamfer (7) at the turning part of the river direction end.

6. The stepped bucket stilling basin according to claim 1, wherein: The raised tail sill (4) is provided with anchor piles (12) between the foundation.

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