CN1229159A

CN1229159A - Method for solving river-bed rising

Info

Publication number: CN1229159A
Application number: CN 98100742
Authority: CN
Inventors: 王武生
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-03-16
Filing date: 1998-03-16
Publication date: 1999-09-22

Abstract

A method for prevent river bed from raising up features a sand-flushing sluice gate and dam are built up in the river to be treated. Said sluice gate and dam feature that the dam foundation is lower than the ground level outside the river dike and the depth of primary sluice gate is lower than that of secondary sluice gate and ground. An artificial channel is built at the downstream of primary sluice gate, which can be gradually extended until it is communicated to sea by the water flush. Its advantages are high effect and practicality.

Description

Solve the method that the riverbed increases

The present invention relates to the regulation field in hydraulic engineering rivers and creeks for solving the method that the riverbed increases.

The downstream in river because the flow velocity of the mild water of physical features slows down, causes the alluvial of silt in the riverbed to its estuary place, and " hanging river " that accumulation all the year round causes brings great threat and loss to people.Build reservoir in the upstream, draw famine and warp, dispatch new water source, rebuild methods such as cutoff, then or because time and cost, or because technical difficulty is difficult for realization.

The purpose of this invention is to provide a kind of method that the riverbed increases that solves, this method can solve increasing of riverbed effectively, and feasibility is strong.

The technical scheme that realizes the object of the invention is:

A kind ofly solve the method that the riverbed increases, be included in the river course that needs the regulation section and build the sand surfing gate dam, its step is as follows: the dam site of (a) choosing each sand surfing gate dam in this section to the location of estuary; (b) build the dam foundation, the datum S of the dam foundation in the dry season of each dam site ₄Be lower than the S on the outer ground 10 of river levee ₅(c) respectively build check dam 2 in two inboards of river levee 1 respectively; (d) build the scouring sluice of porous between check dam, the centre is a main shutter 6, and its both sides are secondary gate 3, make gate base plate 8 depth S of main shutter ₂Be lower than gate base plate 7 depth S of secondary gate ₄And the S on ground 10 ₅(e) respectively in the riverbed under each sand surfing gate dam, build the artificial canal 9 of one section steel concrete, the depth S of the bottom of gool section bottom main shutter ₁With S ₂With width d ₁With d ₂Adapt; (f) after each sand surfing gate dam puts into operation, in the dry season, the groove that utilizes washing away of artificial canal exit and form is with artificial canal inlet under next sand surfing gate dam or the estuary extension construction respectively of the artificial canal of each bar, until forming a steel concrete passage continuous, that feed the Haikou.

Each sand surfing gate dam also can trace back in regular turn from estuary and build by stages and in groups.

Also can brush the coating that reduces frictional resistance at each face of artificial canal gool.

The operating principle of this method is: open main shutter under the secondary closing gate situation of sand surfing gate dam, then a large amount of retainings of sand surfing gate dam interception, because the river course is at the drop on gate dam both sides, the cross section narrow down and the guiding of artificial gool under go out, powerful at a high speed directed current, are constantly washed away the river bed deposit silt before the artificial gool with not having difficulty and take away, thereby form the husky passage of a row automatically.Close main shutter (or opening secondary gate again), then the river bed deposit silt of artificial canal (or river course) both sides moves to the place, river course at the low artificial canal place of physical features thereupon, this will be drained through artificial canal again when opening the next time of secondary closing gate, main shutter, thereby repeatable operation makes that the height in riverbed is progressively reduced.

The present invention compared with prior art has following advantage:

1, the retaining of storage capacity is by means of being deep into underground, reinforced concrete structure so the artificial canal of the prolonged use of energy is got rid of the silt of deposition, the eliminating of silt strengthens the water retention capacity of riverbed reduction, storage capacity, and the increasing of water retention capacity, the increase of water flow velocity, further accelerate the eliminating of silt sediment again and quicken extension being completed into of artificial canal until artificial channel, so utilize the optimum improvement circulation in river self, make this method can solve increasing of riverbed effectively, by effecting a permanent cure but not take stopgap measures, actively but not negatively eliminate " hanging river ".

2, owing to utilize the dry season, thereby can carry out engineering construction, again owing to utilize before original river course and the artificial canal groove of formation naturally, thereby significantly reduce the regulation expense in engineering time and difficulty and river course, thereby increase the feasibility of scheme greatly on land.

3, the increase of the foundation on dam and storage capacity both can increase that the anti-flood capacity in river itself and the annual water yield are rich owes irregular regulating power, and precious water resource is fully utilized.

4, the foundation of sand surfing gate dam also provides condition for the comprehensive development of generating, bridge construction.

The construction by stages and in groups of sand surfing gate dam can solve the difficulty of fund and construction dispatching, further increases the feasibility of scheme.Each face paint of gool further improves the efficient that artificial canal is got rid of silt sediment.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the schematic cross-sectional view of sand surfing gate dam and artificial canal.

Further describe the present invention below in conjunction with accompanying drawing and by embodiment:

Contain certain high river of quantity of sand and mud, " hanging river " that forms in the downstream owing to the alluvial of silt increases with annual 0.1 meter speed, and has to increase one time in per 10 years dyke.

According to the demand of city to the water yield, dam site is chosen to the height and the geological conditions on ground in existing riverbed, is being traced back by estuary to the section of need regulation then, builds a sand surfing gate dam every 10～100 kilometers, and in low water or cutout construction in season.

With wherein certain sand surfing gate dam is example, on-site river, this dam width be 3000 (unit: rice, down with) the absolute altitude S of river levee 1 ₇=62 (all absolute altitudes, its size all refers to height above sea level, down together), the absolute altitude in riverbed is 56, the absolute altitude S on the outer ground 10 of river levee ₅=50.

When using this method to build this sand surfing gate dam, press following size:

The dam foundation of building, the absolute altitude S of its datum ₄=48.The width W of hurdle dam 2 ₂=500.The width W of sand surfing gate dam ₁=2000, the absolute altitude S of its end face ₆=60.Be built in 1 ^# Main shutter 6 on the gate pier 5, its width d ₂=12, the absolute altitude S of its base plate 8 ₂=40.Be built in 2 ^# Secondary gate 3 on the gate pier 4, the absolute altitude S of its base plate 7 ₄=48.The artificial canal of building under the dam 9, its length of initially building is 100, is extended by means of the groove that washes away nature formation before the canal later on, until connecting with the artificial canal on a following dam.Gool d=25 suitable for reading, its absolute altitude S ₃=47.End opening d ₁=15, its absolute altitude S ₁=39.

After the sand surfing gate dam built up, the intercept water absolute altitude of position of its hurdle was 58, and the drop before and after the dam is 58-39=19, and the distance on this dam and next dam is 20 kilometers, so the ratio depreciation of gate dam is 19/20 * 10 ³～1/1000, be much higher than the ratio depreciation (1/8000 ≈ 1/10000) in former river course and carry sand content, the therefore alluvial that can solve silt effectively up to 500 kilograms/every cubic metre ratio depreciation (1/5000) that current are required.

For farthest sand surfing gate dam, for preventing the entrance of sedimentation, can utilize the giant on the clear large junk to impact this place earlier, and then open main shutter at artificial canal from the marine outfall.

For wash away in the riverbed less than the minority position, also available bulldozer near artificial canal, is opened main shutter with this silt heap then.

Claims

1, a kind ofly solve the method that the riverbed increases, be included in the river course that needs the regulation section and build the sand surfing gate dam, it is characterized in that containing the following step:

(a) choose the dam site of each sand surfing gate dam to the location of estuary in this section;

(b) build the dam foundation in the dry season of each dam site, the datum of the dam foundation is lower than the outer ground of river levee;

(c) respectively build check dam in two inboards of river levee respectively;

(d) build the scouring sluice of porous between check dam, the centre is a main shutter, and its both sides are secondary gate, makes the gate base plate degree of depth of main shutter be lower than the gate base plate degree of depth and the ground of secondary gate;

(e) respectively in the riverbed under each sand surfing gate dam, build the artificial canal of one section steel concrete, the degree of depth and the width of the bottom of gool section bottom main shutter adapts;

(f) after each sand surfing gate dam puts into operation, in the dry season, the groove that utilizes washing away of artificial canal exit and form is with artificial canal inlet under next sand surfing gate dam or the estuary extension construction respectively of the artificial canal of each bar, until forming a steel concrete passage continuous, that feed the Haikou.

2, the method that increases of solution according to claim 1 riverbed, it is characterized in that: described each sand surfing gate dam traces back in regular turn from estuary and builds by stages and in groups.

3, the method that increases of solution according to claim 1 and 2 riverbed, it is characterized in that: each face of described artificial canal gool brushes the coating that reduces frictional resistance.