CN202181540U - RCC (roller compacted concrete) arch dam - Google Patents

Abstract

The utility model discloses an RCC (roller compacted concrete) arch dam; impermeable layers are arranged on the surfaces at the upstream and the downstream of a dam body and are polyurea elastomer impermeable layers obtained by adopting spin-spray membrane processing method or other construction methods; when necessary, the polyurea elastomer impermeable layers can be arranged on all water-retaining surfaces and flow-passing surfaces of the dam body. Polyuria is a water-proof, anti-corrosion, anti-impact, wear-resisting, wet-resisting and heat-resisting material, and has the advantages of zero VOC (volatile organic compounds), environment protection, fast curing, excellent physical and chemical mechanical properties, high construction efficiency and the like. The adoption of the polyurea elastomer impermeable layers can obviously improve the impervious performance of the RCC arch dam.

Description

A kind of rolled concrete arch dam

Technical field

The utility model relates to the technical field of hydraulic engineering, particularly a kind of rolled concrete arch dam.

Background technology

Roller compacted concrete is a kind of concrete of dry poor-water mud; Use the coarse aggregate of portland cement, volcano grey matter admixture, water, Admixture, sand and grading control to mix the harsh concrete of processing no slump; Adopt and identical transportation and the making equipment of earth and rockfill dam construction, use the vibrating roller compaction in layers.The roller compacted concrete technology has that cement consumption is low, height is mixed admixture, middle cementitious material, thin layer rolls even full section characteristics such as province's construction continuously; Advantages such as rolled concrete arch dam is fast with its speed of application, duration weak point, reduced investment, mechanization degree is high, construction is simple, compliance is strong, environmental protection enjoy world Ba Gongjie favor.

But people find in to the concrete dam Study on durability: constuction joint face and structural joint face seepage are to influence the impervious key factor of dam body, become the central core of circulation of infiltration.Such as adhesive surface of the aspect of building, seam face and the New-old concrete of concrete dam etc., these positions often become cracking resistance, antiskid and impervious weak link under the influence of factors such as thermal stresses and environment.Rolled concrete arch dam is because cement consumption is few; Mixing water is few, and adhesion stress is little between the material, and the barrier performance of itself is than normal concrete difference; And the form of construction work that it adopts thin layer stone, thin layer to roll; Therefore have horizontal construction joint, add the transverse joint of rolled concrete arch dam, these seam faces will be impervious weak links in the structure long-term safety running; The quality of its anti-permeability performance directly influences the safety and the reliability of this class formation, and is most important to the stablizing of total, cracking resistance etc.The leakage preventing structure of tradition dam is to adopt the perhaps impervious good concrete of cement mortar, prefabricated leakage preventing structure etc. mostly; This structure corrosion resistance and cracking resistance are all limited; Particularly, will destroy its antiseepage function to some extent owing to reasons such as construction quality and operation maintenance may produce the crack.For roller compacted concrete arch earth dam, speed of application is its remarkable advantage soon, and traditional leakage preventing structure also will have a strong impact on its speed of application.Therefore the antiseepage problem of rolled concrete arch dam is a very outstanding and problem demanding prompt solution.

Summary of the invention

The technical problem that the utility model will solve provides the strong rolled concrete arch dam of a kind of barrier performance.

The technical scheme that addresses the above problem is: this rolled concrete arch dam is provided with the SPUA impervious barrier at the upstream and downstream face of dam body.

In case of necessity, also can be provided with the SPUA impervious barrier at the whole dash and the flow-passing surface of dam body.

Because polyureas is a kind of waterproof, anticorrosion, impact-resisting wear-resisting, anti-slippery, heat-resisting material; Has zero VOC (Volatile Organic Compounds; VOC), meet environmental protection, solidify fast, the physics and chemistry mechanical property is excellent, high efficient construction, adopts this impervious barrier can significantly improve the barrier performance of rolled concrete arch dam.

Description of drawings

Fig. 1 is the position view according to the impervious barrier of an embodiment of the utility model.

Specific embodiments

Before the Spray Polyurea Elastomer impervious barrier, should adopt instruments such as angle grinding machine, giant that concrete surface is handled.Adopt giant to dash hair, pressure should be controlled between 5MPa～40MPa.

Fig. 1 be according to an embodiment of the utility model the position view of impervious barrier show the surface that dam body contacts and possibly contact with current.This rolled concrete arch dam is provided with impervious barrier 3 on the upstream and downstream surface of dam body, and this impervious barrier is the SPUA impervious barrier that adopts churning film worker method.The spraying scope of this impervious barrier runs through the left bank to right bank, spraying highly can be at check flood level 2 downward h places at the bottom of the dam elevation 4 places.H is a safety water head, and its design formulas is following:

$h=\frac{{\mathrm{\σ}}_w}{\mathrm{k\ρg}}$

σ wherein _wThe anti-permeability strength of-roller compacted concrete

The k-safety factor

The density of ρ-water

G-acceleration of gravity

So, elevation-safety water head (as shown in Figure 1) at the bottom of dam body spraying height=check flood level-dam.

In addition; Consider that construction quality is uneven; For the relatively poor engineering of construction quality, should improve its safety factor, increase its spraying scope; Can consider whole dash of dam body and flow-passing surface spray polyurea material in case of necessity, promptly be provided with and adopt churning film worker's method or hand to scrape the SPUA impervious barrier of worker's method.Can certainly adopt general spraying process.

Preferably, the location of cracks on the surface between upstream and downstream is provided with and adopts churning film worker's method or hand to scrape the SPUA of worker's method.Can certainly adopt general spraying process.Need be for transverse joint 1 and existing location of cracks thickness according to wide definite its thickness of seam.Need carry out specially treated during in addition, for transverse joint and the spraying of other privileged sites.

Preferably, be provided with employing churning film worker's method or hand on the surface of flood spillway, aperture, dam body spillwag chute and scrape the SPUA impervious barrier of worker's method.Can certainly adopt general spraying process.

Preferably, safety water head smaller or equal to 50 meters situation under the thickness of impervious barrier be 2 millimeters, safety water head greater than 50 meters situation under the thickness of 50 meters impervious barriers of the every increase of safety water head increase by 1 millimeter.That is it is 3 millimeters, if safety water head equals the thickness of impervious barrier under 100 meters the situation.

The beneficial effect of the utility model had both comprised advantages such as the rolled concrete arch dam speed of application is fast, duration weak point, reduced investment, mechanization degree is high, construction is simple, compliance is strong, environmental protection; The polyurea materials that cooperates spraying " churning film " worker's method; In energy-conserving and environment-protective; Success solves its antiseepage problem, and has both anticorrosion, impact-resisting wear-resisting, advantage such as anti-slippery, heat-resisting." churning film " worker's method has also overcome the drum of having filmed, basal plane that polyurea materials and construction technology deficiency the cause problem such as bad of peeling off, harden, and makes that this The Application of Technology is more secure.The determined spraying scope of the utility model, coating thickness have guaranteed that this has the reasonability of polyureas impervious barrier rolled concrete arch dam, economy and safety.

The above; It only is the preferred embodiment of the utility model; Be not that the utility model is done any pro forma restriction; Every technical spirit according to the utility model all still belongs to the protection domain of the utility model technical scheme to any simple modification, equivalent variations and modification that above embodiment did.

Claims (10)

1. rolled concrete arch dam, it is characterized in that: the upstream and downstream face at dam body is provided with the SPUA impervious barrier.

2. rolled concrete arch dam according to claim 1 is characterized in that: impervious barrier is to adopt churning film worker's method or hand to scrape the SPUA impervious barrier of worker's method.

3. rolled concrete arch dam according to claim 1 is characterized in that: the location of cracks on the upstream and downstream surface is provided with the SPUA impervious barrier.

4. rolled concrete arch dam according to claim 3 is characterized in that: impervious barrier is to adopt churning film worker's method or hand to scrape the SPUA impervious barrier of worker's method.

5. rolled concrete arch dam according to claim 3 is characterized in that: the surface at flood spillway, aperture, dam body spillwag chute is provided with the SPUA impervious barrier.

6. rolled concrete arch dam according to claim 5 is characterized in that: impervious barrier is to adopt churning film worker's method or hand to scrape the SPUA impervious barrier of worker's method.

7. according to each described rolled concrete arch dam of claim 1-6; It is characterized in that: safety water head smaller or equal to 50 meters situation under the thickness of impervious barrier be 2 millimeters, safety water head greater than 50 meters situation under the thickness of 50 meters impervious barriers of the every increase of safety water head increase by 1 millimeter.

8. rolled concrete arch dam, it is characterized in that: whole dash and flow-passing surface at dam body are provided with the SPUA impervious barrier.

9. rolled concrete arch dam according to claim 8 is characterized in that: this impervious barrier is to adopt churning film worker's method or hand to scrape the SPUA impervious barrier of worker's method.

10. rolled concrete arch dam according to claim 8; It is characterized in that: safety water head smaller or equal to 50 meters situation under the thickness of impervious barrier be 2 millimeters, safety water head greater than 50 meters situation under the thickness of 50 meters impervious barriers of the every increase of safety water head increase by 1 millimeter.

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