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CN-224213243-U - Sand foundation sluice anti-flushing structure

CN224213243UCN 224213243 UCN224213243 UCN 224213243UCN-224213243-U

Abstract

The utility model provides a sand foundation sluice anti-impact structure, and relates to the technical field of sluice engineering energy dissipation anti-impact. The sand foundation sluice anti-flushing structure is characterized in that a reinforced concrete underground continuous anti-flushing wall is arranged at the tail end of a sea, an anti-flushing groove and a river channel connecting section are arranged in a pi-shaped mode on the plane of the anti-flushing wall to protect the bottom, fine grains of a sand foundation are prevented from running off downstream in the process of forming a flushing pit, the situation that the sluice safety is endangered due to the fact that the sea is overturned due to bottom overhead and further hollow out of a sluice chamber foundation is avoided, the sea is in a roughened concrete structure, the surplus energy after a pond can be effectively dissipated, the social development requirement is met, a rockfill anti-bottom connecting section with a relatively slow gradient is arranged between the anti-flushing groove and a downstream river channel, turbulent rotary rolling water flow formed near the anti-flushing groove is further prevented from flushing the river channel, and a roughened anti-skidding self-locking concrete precast block is arranged on the surrounding surface of a square concrete ridge in the anti-flushing range of the river channel side slope, so that the flushing of the river bank can be effectively reduced, and the bank is protected.

Inventors

  • MENG FANBING
  • WANG XINKE
  • GONG BIN
  • WU YANQING
  • XUE LONG
  • XU TINGTING
  • YE LONGCHUN

Assignees

  • 安徽省水利水电勘测设计研究总院股份有限公司

Dates

Publication Date
20260508
Application Date
20250411

Claims (10)

  1. 1. The sand foundation sluice anti-flushing structure is characterized by sequentially comprising a sea surface (1), an anti-flushing wall (2), an anti-flushing groove (3), a bottom protection (4) and a river slope (5) along the water flow direction, wherein the water flow direction is close to the outlet of a stilling pool (0); the marine diffuser (1) is of a concrete structure, is arranged in blocks, is provided with roughened energy dissipation concrete ridges (6) on the surface, and is paved with a two-way reinforcing steel bar net (8); The anti-flushing wall (2) is a reinforced concrete underground continuous wall, is positioned at the tail end of the sea surface (1), is transversely spanned on the plane, longitudinally extends to the tail end of the bottom protection (4) at the downstream of the two transverse ends, is arranged in a pi shape, encloses the anti-flushing groove (3) and the bottom protection (4), is rigidly connected with the adjacent sea surface (1) through a tension rod reinforcing steel bar (12), is provided with a concrete anti-slip wall (11) at the front section of the sea surface (1) adjacent to the anti-flushing wall (2), and takes the greater value of the river bed flushing depth +1.0m at the tail end of the sea surface (1) and three times the groove depth of the anti-flushing groove (3); The anti-flushing groove (3) is of a rockfill structure, is arranged next to the anti-flushing wall (2) and is of a wide and shallow trapezoid section, the groove top is flush with the tail end of the sea surface (1), the groove depth dc is 1.5 m-2.5 m, the single wide rockfill amount of the anti-flushing groove (3), namely the trapezoid section area W=Ad m , A is an experience coefficient, and the sand foundation is 3-4; The bottom protection (4) is of a rock-fill structure; The river side slope (5) adopts a square concrete ridge enclosing surface to be provided with a roughened anti-slip concrete self-locking precast block (18) in an anti-impact range.
  2. 2. The sand foundation sluice anti-impact structure of claim 1, wherein the strength grade of the marine diffuse (1) concrete is not less than C25, the thickness of the marine diffuse (1) concrete is 0.2 m-0.30 m, the marine diffuse (1) surface layer bidirectional reinforcement net (8) reinforcement is obliquely arranged downstream with a gradient m1 not steeper than 1:10, the diameter of the marine diffuse (1) surface layer bidirectional reinforcement net (8) reinforcement is 8 mm-12 mm, the distance is 0.15 m-0.20 m, and the thickness of the concrete protection layer is 30mm.
  3. 3. The sand foundation sluice anti-impact structure of claim 1, wherein the block length L of the sea-cover (1) is 4.0-6.0 m, a permanent seam (9) is arranged between adjacent blocks, the seam width is 0.02m, a polyethylene closed pore plate is filled in the seam, concrete tooth walls (10) are arranged below every two blocks at intervals of the sea-cover (1), and the concrete tooth walls (10) are 0.4-0.6 m wide and 0.8-1.0 m high.
  4. 4. The sand foundation sluice anti-flushing structure according to claim 1, characterized in that two layers of the filtering material (13) are arranged below the sea surface (1), wherein the two layers of the filtering material (13) are middle coarse sand with the thickness of 0.1m and crushed stone with the thickness of 0.1m from bottom to top.
  5. 5. The sand foundation sluice anti-flushing structure according to claim 1, characterized in that the energy dissipation reinforced concrete ridge (6) is 0.5 m-0.8 m wide and 0.1-0.2 m high, is arranged along the water flow direction at intervals of 5.0m and is perpendicular to the water flow direction continuously, the energy dissipation reinforced bars (7) with the diameters of 8-12 mm and the intervals of 0.15-0.2 m are arranged in the ridge, the thickness of the concrete protection layer is 30mm, and the U-shaped reinforced bars in the energy dissipation reinforced bars (7) are inserted into the sea surface (1) for 0.1m.
  6. 6. The sand foundation sluice anti-impact structure of claim 1, wherein the concrete strength grade of the anti-impact wall (2) is not less than C25, the wall thickness is not less than 0.6m, the steel bars are configured according to stress conditions, the tension bar steel bars (12) are HRB400, the diameter of the steel bars is not less than 20mm, the distance between the steel bars is 0.15-0.2 m, the anchoring length is not less than 1.0m, and the wall width of the concrete anti-slip wall (11) is 0.8m, and the height is not less than 2.0m.
  7. 7. The sand foundation sluice anti-scour structure of claim 1, characterized in that the river bed scour depth d m is determined by: Wherein q m is the single-width flow m 2 /s at the tail end of the sea-cover (1); v d is the allowable no-flushing flow rate m/s of the soil of the river bed; h m is the water depth m at the end of the sea-cover (1).
  8. 8. The sand foundation sluice anti-flushing structure of claim 1, wherein the upstream side slope m2 and the downstream side slope m2 of the anti-flushing groove (3) are 1:3-1:4, the side slopes m4 on the two sides are 1:2-1:3, the particle size d of the rockfill in the anti-flushing groove (3) needs to meet the anti-flushing requirement, d=0.05v 2 , V is the flow velocity of water at the tail end of the sea-cover (1), the particle size d of the rockfill is not less than 0.3m, four layers of filter materials (14) are arranged below the anti-flushing groove (3), and the four layers of filter materials (14) are sequentially 300-g/m 2 , 0.400-0.25 m thick medium coarse sand, 0.15-0.25 m thick melon seed pieces and 0.15-0.25 m broken stone.
  9. 9. The sand foundation sluice anti-impact structure according to claim 1, wherein the bottom protection (4) is a river channel connecting section rockfill bottom protection, the rockfill thickness is 1.0-1.5 m, the rockfill particle size is 0.3-0.5 m, the connecting section slope ratio m3 is 1:4-1:6, and the top horizontal section extends downwards by 5.0-8.0 m.
  10. 10. The sand foundation sluice anti-impact structure according to claim 1, characterized in that the slope protection of the river side slope (5) in the corresponding river bottom anti-impact measure range adopts a concrete self-locking precast block (18) with the thickness of 0.10 m-0.15 m, a gravel cushion layer with the thickness of 0.1m is arranged below, and the slope ratio m4 of the river side slope (5) is not more than 1:3; The weight of a single concrete self-locking precast block (18) is not less than 65kg, roughened anti-slip strips are arranged on the surface of the concrete self-locking precast block, and the protruding height of the roughened anti-slip strips is 5 mm-8 mm; The river side slope (5) is provided with a concrete capping (15) at the upper end, a concrete foot groove (16) at the lower end, and concrete banks (17) at a longitudinal interval of 8.0-15 m to form a square enclosing concrete self-locking precast block (18).

Description

Sand foundation sluice anti-flushing structure Technical Field The utility model relates to the technical field of energy dissipation and anti-flushing in sluice engineering, in particular to a sand foundation sluice anti-flushing structure. Background The sluice is a low-head hydraulic building, has the double functions of water blocking and water discharging, and needs to be protected by adopting proper energy dissipation and anti-impact measures. The sluice usually adopts the underflow type energy dissipation, and the bottom velocity of flow at the end of the stilling pool 0 is still great, and the turbulent phenomenon of the water flow is severe, and still has stronger scouring ability to the river bed, so the anti-scour measures are required to be arranged behind the stilling pool 0, thereby effectively dissipating the residual kinetic energy of the water flow, leading the water flow to become stable and evenly distributed, protecting the river bed and the river bank from being scoured by the water flow, and protecting the safety of buildings such as upstream lock chambers and the like. The anti-flushing engineering measures mainly adopt a sea surface and an anti-flushing groove, the sea surface is used for dissipating the residual energy of most water flow after passing through the absorption basin 0, the water flow at the tail end of the sea surface still has a certain flushing capacity, and the anti-flushing groove is arranged at the tail end of the sea surface and is used for covering the upstream slope of the flushing pit to prevent the upstream slope from expanding when the downstream riverbed forms the flushing pit so as to protect the sea surface safety. But for the sandy soil such as silt, fine sand, light sandy loam, etc. of river course soil, the scour resistance is poor, and in the scour pit formation process at the sea diffuse end, fine silt can run off downstream, and the sea diffuse collapses and endanger upstream lock chamber safety because of the bottom is built on stilts, and the sluice on sandy soil basis takes place because of the improper circumstances of scour prevention measure setting, therefore the sluice scour prevention structure on sandy soil basis should be different from the sluice on the cohesive soil foundation, need set up the scour prevention wall between sea diffuse and scour prevention groove, strengthen its impact resistance, protection sluice safety. Reference is now made to the chinese patent of the issued publication CN 203782664U, which discloses a "scour protection structure for a sandy soil foundation sluice," comprising, in order along the water flow direction, a sea-diffusing masonry section, a tooth wall, a sea-diffusing drywall section, and a scour protection trough, characterized in that a steel sheet pile seepage-proofing wall is provided between the sea-diffusing drywall section and the scour protection trough. The steel sheet pile seepage-proofing wall disclosed in the patent of the publication No. CN 203782664 is in a pile top free cantilever structure, when a flushing pit is deeper, the soil retaining stability and the impact resistance of the steel sheet pile are poor, and the pile length and the soil penetration depth of a precast pile are limited, so that the sluice anti-impact structure on the basis of the prior social development requirements, the poor impact stability of the common cantilever sheet pile anti-impact wall and the like needs to be innovatively improved and developed to protect the river bed and sluice safety. Disclosure of utility model Aiming at the defects of the prior art, the utility model provides a sluice anti-impact structure of a sand foundation, which solves the problem of poor impact resistance of the sluice sand foundation. In order to achieve the above purpose, the utility model is realized by the following technical scheme: The sand foundation sluice anti-flushing structure comprises a sea surface, an anti-flushing wall, an anti-flushing groove, a bottom protection and a river slope in sequence along the water flow direction, wherein the sand foundation sluice anti-flushing structure is close to an outlet of a stilling pool; The sea surface is provided with rough energy dissipation concrete ridges, and a surface layer is paved with a bidirectional reinforcing steel bar net; the anti-flushing wall is a reinforced concrete underground diaphragm wall, is positioned at the tail end of a sea, is arranged in a pi-shaped manner transversely crossing a river channel and longitudinally extending to the tail end of a bottom protector at the downstream of two transverse ends, encloses an anti-flushing groove and the bottom protector, and is characterized in that the top of the anti-flushing wall is rigidly connected with adjacent sea-flushing through a reinforced steel bar with a tension rod, and a concrete anti-slip wall is arranged at the front section of a sea-flushing block adjacent to the anti-flushing wall; the anti-flushi