CN104746470A - Simulation production method for river bottom protection line of river physical model - Google Patents

Abstract

The invention discloses a simulation production method for a river bottom protection line of a river physical model. The method is characterized in that cotton yarn cloth is adopted to simulate a line pad prototype of polypropylene weave cloth, an aluminum sheet is adopted to simulate a concrete ballast block prototype, the aluminum sheet is adhered to the cotton yarn cloth by adopting epoxy resin glue, and simulation production of the river bottom protection line of the model is completed. According to the method, the similarity requirement of the river bottom protection line simulation production can be well met, and the simulation reliability is improved; meanwhile the production is convenient and rapid, and the accuracy and testing progress requirement of the large-scaled line body simulation production can be met.

Description

The simulation preparation method of a kind of river work physical model river bottom protection row

Technical field

The present invention relates to a kind of water conservancy riverbed and guard analogue technique, especially relate to the simulation preparation method of a kind of river work physical model river bottom protection row.

Background technology

Alluvial stream riverbank and Zhou Tan to guard in engineering and adopt soft raft bed protection structure more, and soft raft bed protection structure good integrity, can adapt to river-bed deformation, and easy construction, price are lower, can reach the renovating effect desired by design.

For the waterway regulation of the middle and lower reach of Yangtze River and bank protection work, engineering many employings polypropylene woven cloth, the effects such as the isolation utilizing them to have, anti-filter, reinforcement, are sewn into soft raft pad, then apply ballast formation soft raft thereon, guard for riverbed.Therefore soft raft structure is primarily of row's pad and concrete ballast carrier two large divisions composition, soft raft structure is mainly divided into again D type to arrange and X-type arranges two kinds, D type mining small rectangular concrete block makes ballast carrier (i.e. concrete ballast carrier), between ballast carrier, gap is larger, be mainly used in working water level to protect with the riverbed of lower portion, its row's single pad block specifications is 50m × 40m (long × wide).Row's pad adopts 250g/m ²polypropylene woven cloth make reinforcement and form, for ease of row's pad easy sinking during construction to assigned address and the stability ensureing isostere, row's pad is connected to concrete ballast carrier by the form system of matrix, this ballast carrier is C20 concrete block, flat shape is rendered as rectangle, it is of a size of 40cm × 26cm × 10cm (long × wide × thick), and its weight is 21.93kg.The larger rectangle concrete block ballast carrier of X-type mining, between ballast carrier, gap is less, by taking certain measure, has good anti-aging ability, and this row is mainly used in guarding of the beach of the withered season exposure water surface.Its row's single pad block specifications is 50m × 28m (long × wide).

For the river controlling projects of complexity, often need to adopt the research means of river work physical model to prove the reasonability of renovation scheme, therefore, often also need to arrange the regulating structures such as river bottom protection row in physical model.Adopt which type of material to simulate row's pad, the kentledge in river bottom protection row, could meet the similitude requirement of model, be the important leverage of guarantee test achievement reliability; Secondly middle and lower reach of Yangtze River shore protection, to protect the scopes such as beach comparatively large, need the isostere area that makes also comparatively large in river model, the making amount of kentledge is often very huge.

For the prototype row pad that monolithic specification is 50m × 40m (long × wide), as model scale adopts 1:80, then model row pad specification is 0.625m × 0.5m; Ballast carrier prototype size is 40cm × 26cm × 10cm (long × wide × thick), and corresponding model kentledge specification is 8.0mm × 3.25mm × 1.25mm, and row's pad kentledge quantity is about 7920 pieces.For bank protection work, the width of isostere cross-sectional direction mostly is 100 ~ 200m, often reaches several kilometers along Cheng Changdu.If the isostere scope of modeling is 1.25m × 20m, then must the row's of making pad specification be the model soft raft of 0.625m × 0.5m be 80 pieces, kentledge quantity will reach 63.36 × 10 ⁴block.

The many employings of soft raft kentledge of model testing in the past are manually sheared, arrange, the mode that bonds carries out fabrication and installation, adopt this production method, have been difficult to precision that isostere simulation on a large scale makes and test schedule requirement.Therefore how to design a kind of high accuracy, fast method for preparing of model isostere, can be implemented in river model the simulation carrying out large-scale river bottom protection row, become the problem that model testing is anxious to be resolved.

Summary of the invention

For above-mentioned the deficiencies in the prior art, technical problem to be solved by this invention is: how to provide one can meet similitude requirement well, improves the simulation preparation method of the river work physical model river bottom protection row of simulation reliability; Make it have easy to make, feature efficiently, precision and test schedule requirement that isostere simulation on a large scale makes can be met.

In order to solve the problems of the technologies described above, present invention employs following technical scheme:

The simulation preparation method of a kind of river work physical model river bottom protection row, it is characterized in that, adopt row's pad prototype of cotton gauze simulation polypropylene woven cloth, adopt the concrete kentledge prototype of aluminium flake simulation C20 material, adopt epoxy resin glue aluminium flake and cotton gauze to be bondd (simulating concrete kentledge prototype is connect bar and arrange the connected mode padding tying), the simulation completing model river bottom protection row makes.

In this programme, prototype kentledge adopts C20 concrete block, modeling material must meeting geometric similar with gravity requirement of similarity; In addition, the selection of simulation material also needs consideration to be convenient to machine-shaping.Aluminium unit weight is 2.7 × 10 ³kg/m ³, close with concrete unit weight, easy processing and fabricating, therefore model kentledge selects aluminium flake to simulate.

Prototype row pad adopts polypropylene woven cloth, consider that the main purpose tested in river model is differentiation and the isostere deformation thereof that simulation river bottom protection row etc. controls river course under the building effect of river, therefore model selection cotton gauze is simulated, be designed to the moulded dimension corresponding with prototype size according to geometry guide.

Prototype arrangement is made the long filament woven bar tying ballast carrier of 100cm; The mode that model adopts epoxy resin aluminium flake cotton gauze bonding to be got up, can ensure the adhesive property in water environment.Should note can not being applied to glue at the gap location of kentledge, to keep the clean and tidy deformability with adapting to riverbed of model isostere.

The present invention program, specifically comprises the following steps:

A, factory's batch suppress aluminium flake, and aluminium flake yardstick meets the geometry guide requirement of concrete kentledge prototype; And obtain the cotton gauze of the geometry guide requirement meeting row's pad prototype;

B, arrangement mode by prototype one width isostere plane guide and concrete kentledge prototype, make the hollow template being used for ballast aluminium flake arrangement location, in hollow template, the position of corresponding each concrete kentledge prototype arranges a hollow mesh, mesh plane is respectively mated (be specially bigger to make aluminium flake just can snap in, be preferably than large 1 of design ballast aluminium flake yardstick) to the aluminium flake size of yardstick and design;

C, hollow template to be positioned on one side gummed paper adhesive surface, more manufactured aluminium flake is sprinkling upon on hollow template, with hand aluminium flake pushed away and put to each mesh of hollow template and suitably pressing, make aluminium flake be bonded on gummed paper by the corresponding arrangement mode of concrete kentledge;

D, get except hollow template, even brushwork epoxy resin on the aluminium flake of the aluminium flake pertinax arranged, before epoxy resin brushing, adopt dilution (epoxy resin and dilution mass ratio are preferably about 6:1) dilution; Leave standstill several minutes wait the epoxy resin brushed dry in the air sticky after again it is glued cotton gauze lay;

E, to bond firmly until aluminium flake and cotton gauze, to be soaked in clear water several minutes, to tear the one side gummed paper at the back side; Namely isostere completes.

After completing, be layed in model relative position by designing requirement, can river model test be carried out.This manufacturing process is fast very convenient, can ensure the reliability of analogue formation, and significantly reduces making intensity, improves make efficiency.

As optimization, the mass ratio of epoxy resin and o-tolyl glycidol ether dilution is preferably 6:1.Epoxy resin diluent coordinates basic mixed with resin to use, and can reduce curing system viscosity, increases mobility, is convenient to isostere large-area construction.O-tolyl glycidol ether water resistance is more excellent, is applicable to the water environment that model isostere is in for a long time.

The material that the present invention selects meets the similitude requirement of river bottom protection row in river work physical model preferably, aluminium flake is suppressed by factory's punch press batch, the hollow template made by a width isostere yardstick and one side gummed paper complete the positioning arrangement of a large amount of aluminium flake, cotton gauze is laid after the brushwork epoxy resin of the aluminium flake back side, be soaked in clear water and after several minutes, tear the operations such as one side gummed paper, namely the high accuracy completing single width river bottom protection row fast makes, making precision when carrying out large-scale river bottom protection row simulation can be improved in river model, manpower and time are saved, there is important production application be worth.

In sum, the present invention can meet river bottom protection row simulation well and make similitude requirement, improves simulation reliability; There is easy to make, feature efficiently simultaneously, precision and test schedule requirement that isostere simulation on a large scale makes can be met.

Accompanying drawing illustrates:

Fig. 1 is the present invention's hollow template structure for aluminium flake arrangement location when specifically implementing.

When Fig. 2 is concrete embodiment, engineering and partial model scope schematic diagram are guarded in Yangtze middle reaches third continent in the third of the twelve Earthly Branches.

Detailed description of the invention

Below in conjunction with detailed description of the invention and example, the present invention is described in further detail.

Detailed description of the invention: the simulation preparation method of a kind of river work physical model river bottom protection row, wherein adopt row's pad prototype of cotton gauze simulation polypropylene woven cloth, adopt aluminium flake simulation concrete kentledge prototype, adopt epoxy resin glue aluminium flake and cotton gauze to be bondd (simulating concrete kentledge prototype is connect bar and arrange the connected mode padding tying), the simulation completing model river bottom protection row makes.

Specifically comprise the following steps:

A, factory's batch suppress aluminium flake, and aluminium flake yardstick meets the geometry guide requirement of concrete kentledge prototype; And obtain the cotton gauze of the geometry guide requirement meeting row's pad prototype;

B, arrangement mode by prototype one width isostere plane guide and concrete kentledge prototype, make the hollow template (as shown in Figure 1) being used for ballast aluminium flake arrangement location, in hollow template, the position of corresponding each concrete kentledge prototype arranges a hollow mesh, and mesh plane is respectively mated to the aluminium flake size of yardstick and design; (be specially bigger to make aluminium flake just can snap in, be preferably than large 1 of design ballast aluminium flake yardstick)

C, hollow template to be positioned on one side gummed paper adhesive surface, more manufactured aluminium flake is sprinkling upon on hollow template, with hand aluminium flake pushed away and put to each mesh of hollow template and suitably pressing, make aluminium flake be bonded on gummed paper by the corresponding arrangement mode of concrete kentledge;

D, get except hollow template, even brushwork epoxy resin on the aluminium flake of the aluminium flake pertinax arranged, adopt diluted before epoxy resin brushing, epoxy resin and dilution mass ratio are about 6:1; Leave standstill several minutes wait the epoxy resin brushed dry in the air sticky after again it is glued cotton gauze lay;

E, to bond firmly until aluminium flake and cotton gauze, to be soaked in clear water several minutes, to tear the one side gummed paper at the back side; Namely isostere completes.

Example: guard engineering model test for lower Jingjiang river reach third continent in the third of the twelve Earthly Branches of Yangtze middle reaches, the specific embodiment of the present invention is described.Right bank third continent in the third of the twelve Earthly Branches collapse on the bank of engineering section is comparatively serious, collapses in year and moves back about 5 ~ 10m.Keep good Channel Condition for poised river gesture, must to third the third of the twelve Earthly Branches continent alluvial flat guard, this section of shore protection length is about 1.9km.

This bank protection work mainly adopts the smooth-going bank protection structure pattern of ramp type, land employing steel wire grid mask and gauze wire cloth gabion retaining wall, adopts the mode of soft raft river bottom protection, jackstone town pin under water.River bottom protection is to middle of the river sinking D type row from low water platform under water, and mattress sinking width 100 ~ 200m, the upper thick 1m of jackstone of D type row, outside isostere, 20 wide erosion control stone thickness are 1.5m.In order to study the rational width scope of river bottom protection and guard the differentiation situation in riverbed under engineering effect, intend the river model test of carrying out this project.

(1) modelling

According to test objective, modelling is λ _l=λ _h=80 dynamic bed load models in normal state local, third stage casing, continent in the third of the twelve Earthly Branches is in the situation of washing away in recent years, third continent Upstream section in the third of the twelve Earthly Branches low beach beach face flow velocity is obviously greater than hypomere, and this section is guarded engineering most probable and suffered damaged or destroyed by flood, therefore Local physical model plays gulf, grassland, lower distance shoal protection works downstream termination point is about 900m.Horizontal left border is positioned at for middle of the river master is deep, distance right bank 0m line is about 380m, and right side boundary is positioned at apart from steep bank leading edge distance about 250m.Partial model simulation prototype section scope is about 2400m, width is about 700m (Fig. 2); Partial model tank length is 30m, width is 8.8m.

Natural sand initial velocity is useed force water formula, incipient velocity of sediment in model test U _cmadopt following Chongqing model formation:

$U_{\mathrm{cm}}={\left(\frac{h}{d}\right)}^{\frac{1}{7}}{(10.604\×\frac{{\mathrm{\γ}}_s-\mathrm{\γ}}{\mathrm{\γ}}\mathrm{gd}+4.456\×{10}^{-8}\frac{10+h}{d^{0.72}})}^{\frac{1}{2}}$

In formula, h is the depth of water, and d is model sasnd particle diameter, γ _s, γ is respectively the unit weight of model sasnd and water.Select γ _s=1.33tf/m ³rongchang County's cleaned coal as model sasnd.Major trough model sasnd particle diameter 0.1 ~ 0.2mm, beach face model sasnd particle diameter 0.1 ~ 0.3mm, initial velocity ratio and flow velocity guide value close.

According to the husky process of the water after the normal retaining of Three Gorges Reservoir 175m, select typical case's series year water condition to carry out washout test, the trend of washing away of river bottom protection row leading edge major trough riverbed and beach face is analyzed.

(2) simulation material of bank protection structure

1. be the simulation of concrete block soft raft.Prototype isostere adopts polypropylene woven cloth, model selection cotton gauze.2. concrete ballast carrier simulation.Prototype adopts C20 concrete block, and model selection aluminium flake simulation concrete block, gets up aluminium flake cotton gauze bonding.3. jackstone simulation.Prototype block stone particle diameter is 0.15m ~ 0.6m, and average grain diameter is 0.4m, and the ratio that particle diameter is greater than 0.4m should be greater than 85%.Model is adopted and is reduced according to geometry guide the Guamishi that rear average grain diameter is 0.5cm.4. gauze wire cloth component.Prototype size 6m × 2m × 0.23m, adopts the similar cement mortar of surface roughness to simulate.

The size of simulation regulating structure sees the following form.

Regulating structure size table simulated by table 1

Type	Leiomyoma cells	Prototype size	Cast material	Moulded dimension
					D type is arranged	Polypropylene woven cloth	50m×40m	Cotton	62.5cm×50cm
D type is arranged	Concrete block ballast carrier	40cm×26cm×10cm	Aluminium flake	0.5cm×0.325cm×0.125cm
					Jackstone	Block stone	0.3～0.4m	Rubble	0.4～0.5cm

(3) high accuracy, the quick Fabrication of river bottom protection row

The river bottom protection row of modeling lays width average out to 1.25m, and longitudinal length is 20m, then must the row of making pad the model soft raft 80 pieces that specification is 62.5cm × 50cm, aluminium flake kentledge yardstick 0.5cm × 0.325cm × 0.125cm, aluminium flake quantity reaches 63.36 × 10 ⁴block.

A, according to ballast concrete block thickness, select thickness to be the aluminium sheet of 1.25mm, entrust factory to suppress aluminium flake, aluminium flake planar dimension 0.5cm × 0.325cm, quantity about 64 × 10 by numerical control press batch ⁴sheet.

B, the width by prototype one width isostere, length guide, make hollow template (see Fig. 1) by the arrangement mode of every block kentledge, and perpendicular rib, cross rib width are arranged according to the spacing of kentledge, and namely the mesh of each hollow out arranges a kentledge.Prototype concrete kentledge longitudinally, horizontal spacing is respectively 10cm, 24cm, and therefore the perpendicular rib of hollow template, cross rib width are respectively 1.25mm, 3mm, and the yardstick of hollow out mesh is 5mm × 3.25mm.

Conveniently manufactured aluminium flake is arranged in each mesh, 5mm × 3.25mm yardstick of the scale ratio design of hollow out mesh laterally, is longitudinally all expanding 1.

C, hollow template to be positioned on one side gummed paper adhesive surface, more manufactured aluminium flake is dispersed on hollow template, put to each mesh of hollow template and suitably pressing with hand push, make aluminium flake be bonded on gummed paper by the corresponding arrangement mode of kentledge;

D, get except hollow template, then even brushwork epoxy resin glue on aluminium flake, this glue is formed by the proportions of 6:1 by epoxy resin and dilution.Note can not being applied to glue at the gap location of kentledge, with the deformability keeping the clean and tidy of model isostere and isostere to adapt to riverbed.Leave standstill several minutes after the epoxy resin brushed slightly dries, then the cotton gauze of 62.5cm × 50cm is laid on the aluminium flake of brushwork epoxy resin by relevant position.

E, bond firmly until aluminium flake and cotton gauze, to be soaked in clear water several minutes, tear the one side gummed paper at the back side, namely isostere completes.

(4) be layed in model relative position by designing requirement, can river model test be carried out.Discharge Typical Year discharge process, the differentiation in observation riverbed and isostere deformation, optimize and guard scheme, namely complete model testing.

The simulation of being arranged by above-mentioned river bottom protection and high accuracy, fast method for preparing, substantially increased in river model the simulation precision carrying out large-scale river bottom protection row, saved manpower and time, has important production application and be worth.

Claims (3)

1. the simulation preparation method of a river work physical model river bottom protection row, it is characterized in that, adopt row's pad prototype of cotton gauze simulation polypropylene woven cloth, adopt aluminium flake simulation concrete kentledge prototype, adopt epoxy resin glue aluminium flake and cotton gauze to be bondd, the simulation completing model river bottom protection row makes.

2. the simulation preparation method of river work physical model river bottom protection row as claimed in claim 1, is characterized in that, specifically comprise the following steps:

A, factory's batch suppress aluminium flake, and aluminium flake yardstick meets the geometry guide requirement of concrete kentledge prototype; And obtain the cotton gauze of the geometry guide requirement meeting row's pad prototype;

B, arrangement mode by prototype one width isostere plane guide and concrete kentledge prototype, make the hollow template being used for ballast aluminium flake arrangement location, in hollow template, the position of corresponding each concrete kentledge prototype arranges a hollow mesh, and mesh plane is respectively mated to the aluminium flake size of yardstick and design;

C, hollow template to be positioned on one side gummed paper adhesive surface, more manufactured aluminium flake is sprinkling upon on hollow template, with hand aluminium flake pushed away and put to each mesh of hollow template and suitably pressing, make aluminium flake be bonded on gummed paper by the corresponding arrangement mode of concrete kentledge;

D, get except hollow template, even brushwork epoxy resin on the aluminium flake of the aluminium flake pertinax arranged, before epoxy resin brushing, adopt diluted; Leave standstill several minutes wait the epoxy resin brushed dry in the air sticky after again it is glued cotton gauze lay;

E, to bond firmly until aluminium flake and cotton gauze, to be soaked in clear water several minutes, to tear the one side gummed paper at the back side; Namely isostere completes.

3. the simulation preparation method of river work physical model river bottom protection row as claimed in claim 1, it is characterized in that, epoxy resin and dilution mass ratio are preferably 6:1.