CN202450501U

CN202450501U - Bricking drainage structure for stilling pool

Info

Publication number: CN202450501U
Application number: CN2012200112431U
Authority: CN
Inventors: 刘侠; 杨德超; 张连明; 童伟; 王晓东; 石太军; 陈强; 张逢银
Original assignee: Chengdu Hydroelectric Investigation and Design Institute of China Hydropower Engineering Consulting Group
Current assignee: PowerChina Chengdu Engineering Co Ltd
Priority date: 2012-01-11
Filing date: 2012-01-11
Publication date: 2012-09-26
Anticipated expiration: 2022-01-11

Abstract

The utility model discloses a bricking drainage structure which can simplify construction, shorten a construction period and reduce cost and is used for a stilling pool. The drainage structure is arranged between a foundation and a bottom plate of the stilling pool and comprises drainage tanks which are formed by arranging small bricking plates with the same thicknesses on the foundation of the stilling pool vertically and horizontally, wherein a cement mortar layer is arranged on the top surfaces of the small bricking plates; soft water-permeable drainage pipes are embedded in the drainage tanks; sand gravel or a graded broken stone backfill region is positioned between the soft water-permeable drainage pipes and the drainage tanks; and a mortar isolation layer is arranged between the sand gravel or the graded broken stone backfill region and the bottom plate of the stilling pool. By the bricking drainage structure, the basic uplift pressure can be reduced effectively, so that the safe and stable running of the stilling pool is ensured; and the bricking drainage structure is mainly used for the field of the construction of the drainage structures of the stilling pools.

Description

The brick discharge structure of absorption basin

Technical field

The utility model relates to a kind of absorption basin that is used for outlet structure escape works downstream such as gate dam, especially a kind of absorption basin discharge structure.

Background technology

Absorption basin is to impel the energy-dissipating installation that produces the underflow type hydraulic jump in the outlet structure escape works downstream.

At present, the pattern of absorption basin has 3 kinds of descending manner, buffle sill formula and composite types etc. usually.The first, descending manner.Reduce the absorption basin that the protection-apron elevation forms,, let out torrent under impelling and in the pond, produce the underflow type hydraulic jump in order to strengthen Tailwater Depth.The second, the buffle sill formula.On protection-apron (generally protection-apron terminal) buffle sill is set and the absorption basin that forms, be used for hydraulic jump degree of flooding slightly sense is not enough more, or the inconvenient situation of excavation absorption basin.The 3rd, composite type.Not only reduced the protection-apron height but also buffle sill had been set and the absorption basin that forms, and be used for Tailwater Depth and second more and carry water altogether and differ bigger situation deeply.

China has built the big storehouse of many high dams in recent years, and the most head in these dams is high, discharge is big, and energy dissipating requires high.Restricted by landform, geological conditions restriction and service condition, the outlet structure escape works of these high dams often adopt underflow or flip trajectory bucket.Therefore, the stability against floating of absorption basin or cushion pool has just become engineering safety operation urgent problem.

For reducing absorption basin or cushion pool bottom uplift pressure and reducing seepage; Usually arrange evacuation system at absorption basin or cushion pool basis; Between plate seam, sealing is set, in length and breadth to collector drain and drain hole curtain, and seepage proof curtain is set on every side at it in basis instrument; Form the drainage network case system of sealing, to ensure the engineering safety operation and to save underplate concrete and anchoring engineering amount.But because high dam flood discharge intensity is high, flowing pressure is big, and some have arranged that malicious event has still appearred in the absorption basin of evacuation system or cushion pool base plate.The reason that these accidents occur generally includes three aspects; The one, plate thickness or its underpart dowel are provided with deficiency, are difficult to keep base plate homeostasis, and the 2nd, sealing lost efficacy and causes pressure fluctuation meter to pierce plate from seam between seam; Cause that the pulsation uplift force is excessive; The 3rd, impeded drainage, inefficacy cause the base plate uplift pressure excessive, and unstability.This shows that favorably situated evacuation system is most important to the safety of engineering.

In order effectively to reduce the osmotic pressure and the uplift pressure of absorption basin bottom; Be beneficial to the improvement of the stable and stress condition of absorption basin; The general absorption basin foundation drainage mode that adopts mainly is the anti-filter gutter at absorption basin basis incision 30cm～40cm; Bury flexible porous gutter in the ditch underground, backfill rubble and sand around the flexible porous gutter, and densification is real.Engineering practice shows that the layout pump drainage measure of absorption basin bottom can significantly reduce absorption basin substrate uplift pressure.The used form of construction work of the drainage system that the absorption basin mat foundation interweaves in length and breadth is on the absorption basin basis, to leave the gutter that 40cm is wide, 40cm is dark with gaining machine; The flexible porous gutter of arranging in the gutter; Between flexible porous gutter and the rhone sand gravel or graded broken stone back filled region; Flexible porous gutter downstream connect the PVC gutter of embedding cloth in concrete discharges water, and this structure construction is long in time limit, and the cost cost is higher relatively.

The utility model content

In order to overcome long, the higher deficiency of cost cost of existing absorption basin foundation drainage system construction phase, the utility model technical problem to be solved provides a kind of brick discharge structure of absorption basin that can simplify construction, reduction of erection time, reduce cost.

The utility model solves the technical scheme that its technical problem adopted: the brick discharge structure of absorption basin; Said discharge structure is arranged between absorption basin basis and the absorption basin base plate; Comprise with the identical brick small plate of thickness and be arranged in the rhone of arranging in length and breadth that forms on the absorption basin basis; The end face of brick small plate is provided with cement sand bed, is embedded with flexible porous gutter in the rhone, is sand gravel or graded broken stone back filled region between flexible porous gutter and the rhone.

Be provided with cement sand bed and separated slurry layer between said sand gravel or graded broken stone back filled region and absorption basin base plate.

The beneficial effect of the utility model is: can reduce basic uplift pressure effectively, ensure the absorption basin safe and stable operation, can simplify construction, reduction of erection time again, reduce cost.

Description of drawings

Fig. 1 is the plan view of the brick discharge structure of the utility model absorption basin.

Fig. 2 is the elevational view of the brick discharge structure of the utility model absorption basin.

Fig. 1 hollow core arrow is depicted as water (flow) direction.

Del is the elevation symbol among Fig. 2, shown in basal plane be elevation at the bottom of the absorption basin base plate.

Be labeled as among the figure, 1-absorption basin basis, the brick small plate of 2-, the 3-rhone, the 4-cement sand bed, the flexible porous gutter of 5-, 6-sand gravel or graded broken stone back filled region, 7-is at a distance from slurry layer, 8-absorption basin base plate, 9-PVC gutter.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

Like Fig. 1, shown in Figure 2; The brick discharge structure of the absorption basin of the utility model is arranged between absorption basin basis 1 and the absorption basin base plate 8; Comprise with the identical brick small plate 2 of thickness and be arranged in the rhone of arranging in length and breadth 3 that forms on the absorption basin basis 1; The end face of brick small plate 2 is provided with cement sand bed 4, is embedded with flexible porous gutter 5 in the rhone 3, is sand gravel or graded broken stone back filled region 6 between flexible porous gutter 5 and the rhone 3.

4 are provided with at a distance from slurry layer 7 between said sand gravel or graded broken stone back filled region 6 and the cement sand bed, prevent that when building absorption basin base plate 8 concrete cement grout immerses sand gravel or graded broken stone back filled region 6, influences draining.Flexible porous gutter 5 has effective adhesive with PVC gutter 9, and PVC gutter 9 extend in the teeth groove concrete, and absorption basin basis ponding is discharged downstream.

Embodiment:

Like Fig. 1, shown in Figure 2, the brick discharge structure of the absorption basin of the utility model is absorption basin basis 1 with the basement rock; On basement rock, build the brick small plate 2 that several rules is arranged with brick; The end face of brick small plate 2 is with the cement sand plaster levelling, and forming thickness is the cement sand bed 4 of 40mm～50mm, and brick small plate 2 end faces exceed the thickness of basement rock that is the degree of depth of rhone 3 is 40cm; The width of rhone 3 also is 40cm; The longitudinal pitch of the rhone of arranging in length and breadth 3 that forms between the brick small plate 2 is 500cm, and horizontal spacing is 1000cm, and the rhone center diameter of arranging is the flexible porous gutter 5 of 20cm; Sand gravels or graded broken stone back filled region 6 are that 1: 1 sand, stone backfill is closely knit with mass ratio in the rhone 3; As separated slurry layer 7, then, the concrete of above discharge structure and periphery seal concrete, building design thickness is as absorption basin base plate 8 with cement packing paper for loam cake.

The making of the building by laying bricks or stones of brick small plate 2, cement mortar, the backfill of sand gravel or graded broken stone back filled region 6 etc. is undertaken by common construction reference.

Through test, above-mentioned discharge structure can satisfy the designing requirement of remarkable reduction absorption basin substrate uplift pressure fully, compares with existing discharge structure, can shorten for 60% construction period, reduces construction cost about 70%.

Claims

1. the brick discharge structure of absorption basin; It is characterized in that: said discharge structure is arranged between absorption basin basis (1) and the absorption basin base plate (8); Comprise that being arranged in absorption basin basis (1) with the identical brick small plate (2) of thickness goes up the rhone of arranging in length and breadth (3) that forms; The end face of brick small plate (2) is provided with cement sand bed (4); Being embedded with flexible porous gutter (5) in the rhone (3), is sand gravel or graded broken stone back filled region (6) between flexible porous gutter (5) and the rhone (3).

2. the brick discharge structure of absorption basin as claimed in claim 1 is characterized in that: be provided with between said sand gravel or graded broken stone back filled region (6) and absorption basin base plate (8) at a distance from slurry layer (7).