CN202466525U - Cement-sand-gravel dam - Google Patents

Abstract

A cement-sand-gravel dam is disclosed. Impervious layers, which are disposed on surfaces of an upper stream and a lower stream of a dam body, are polyureas elastomer impervious layers obtained by using the rotary spraying film construction method or other construction methods. In case of necessity, polyureas elastomer impervious layers can be disposed on all water stop and overflowing surfaces of the dam body. The polyureas is a waterproof, anti-corrosion, anti-punching, wear resistant, wet-slip resistant, and heatproof material, and has advantages of zero VOC, rapid solidification, excellent physical and chemical mechanical properties, high construction efficiency, and ability of meeting the needs of environmental protection. The impervious performance of the cement-sand-gravel dam can be greatly improved by adopting the polyureas elastomer impervious layers.

Description

A kind of cement sand and gravel dam

Technical field

The utility model relates to the technical field of hydraulic engineering, particularly a kind of cement sand and gravel dam.

Background technology

The cement sand and gravel dam is a kind of new dam type that on face dam and Compacted Concrete Gravity Dam Section basis, grows up, and is characterized in adopting the cement sand and gravel material to build a dam, and uses high efficiency cubic metre of earth and stone Transport Machinery and compacting machinary construction.Because the gelatification of cement has increased the shear strength of material, compare with face dam and can dwindle the dam body section, and flood spillway can be set at dam crest; Owing to used the continuous job practices of earth and rockfill dam, compare with RCCD and can simplify construction, reduction of erection time and reduce expense in addition.Cement sand and gravel dam dam material obtains easily, mix is simple, cement consumption is few, and not only the economic security but also the material abandoned that can make full use of in the work progress reduce the influence to surrounding environment.The cement sand and gravel dam is lower to the requirement of dam material, construction technology and the dam foundation; Big construction is basic to realize that zero abandons material; Highlighted in the advantage that conforms, alleviates aspect the environmental disruption, added the low attention that has begun to obtain international Ba Gongjie of short cost of its duration.

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 dam etc., these positions often become cracking resistance, antiskid and impervious weak link under the influence of factors such as thermal stresses and environment.In addition, the cement sand and gravel material aggregate is without the flushing screening, and permeability resistance is relatively poor, and gel material content is low, and the admixture volume is higher, Ca in the hydrated product (OH) ₂Therefore content is few, and under the effect of press water prolonged permeation, cement sand and gravel dam material performance can decrease, and 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 cement mortar or impervious good concrete 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.In addition, for the cement sand and gravel dam, speed of application is its remarkable advantage soon, and traditional leakage preventing structure will have a strong impact on its speed of application.Therefore the antiseepage problem on cement sand and gravel dam becomes its fast-developing key factor of restriction.

Summary of the invention

The technical problem that the utility model will solve provides the strong cement sand and gravel dam of a kind of barrier performance.

The technical scheme that addresses the above problem is: this cement sand and gravel 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 on cement sand and gravel dam.

Description of drawings

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

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 is that the position view according to the impervious barrier of an embodiment of the utility model shows the surface that dam body contacts and possibly contact with current.This cement sand and gravel 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-cement sand and gravel

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 that cement sand and gravel dam construction technology was simple, and dam material is easy to get, and made full use of to abandon to expect to alleviate environmental disruption; The aquation temperature rise is low, and on-the-spot quality control is easy, is fit to mechanized construction; Advantages such as speed of application is fast, and cost is low, the polyurea materials of cooperation spraying " churning film " worker's method; In energy-conserving and environment-protective, successfully solve its antiseepage problem, and have 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 reasonability, economy and the safety on polyureas impervious barrier cement sand and gravel dam.

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. cement sand and gravel dam, it is characterized in that: the upstream and downstream face at dam body is provided with the SPUA impervious barrier.

2. cement sand and gravel according to claim 1 dam 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. cement sand and gravel according to claim 1 dam is characterized in that: the location of cracks on the upstream and downstream surface is provided with the SPUA impervious barrier.

4. cement sand and gravel according to claim 3 dam 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. cement sand and gravel according to claim 3 dam is characterized in that: the surface at flood spillway, aperture, dam body spillwag chute is provided with the SPUA impervious barrier.

6. cement sand and gravel according to claim 5 dam 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 cement sand and gravel 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. cement sand and gravel dam, it is characterized in that: whole dash and flow-passing surface at dam body are provided with the SPUA impervious barrier.

9. cement sand and gravel according to claim 8 dam 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. cement sand and gravel according to claim 8 dam; 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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