CN202175936U - Rock-mounded concrete dam - Google Patents

Abstract

The utility model discloses a rock-mounded concrete dam. Leakage prevention layers are arranged on the surfaces of upstream and downstream of a dam body. The leakage prevention layers are polyurea elastic body leakage prevention layers obtained by a revolving spraying work method or other construction methods. In necessary, the polyurea elastic body leakage prevention layers can be arranged on all water blocking faces and overflowing faces of the dam body. Polyurea is a material being waterproof, anti-corrosion, washing-resistant, abrasion-resistant, slippery-resistant and heat-resistant, and has the advantages of being free of volatile organic compounds (VOC), quick in setting, excellent in physicochemical mechanical property, high in construction efficiency and the like. By means of the polyurea elastic body leakage prevention layers, leakage prevention performance of the rock-mounded concrete dam can be obviously improved.

Description

A kind of rock-fill concrete dam

Technical field

The utility model relates to the technical field of hydraulic engineering, particularly a kind of rock-fill concrete dam.

Background technology

Rock-fill concrete is a kind of new concrete that is proposed by Tsing-Hua University, is a kind of novel mass concrete construction mode that on the basis of self-compacting concrete technology, grows up.It at first directly puts in storage the enrockment of big particle diameter (maximum particle diameter can reach more than the 1m); Be formed with the rockfill in space; Build the low-cost self-compacting concrete of low hydration heat of special exploitation then from rockfill top; Utilize the mobile education resistance ability of height of this self-compacting concrete, make self-compacting concrete rely on deadweight to be filled in the space of enrockment, form concrete in mass complete, closely knit, that higher-strength, low hydration heat, low shrinkage and deformation are arranged.It is simple that the rock-fill concrete technology has construction technology, and comprehensive unit price is low, and the aquation temperature rise is low; On-the-spot quality control is easy; Advantages such as volume stability is good, is fit to mechanized construction, and speed of application is fast; Be particularly suitable for being applied to have vast potential for future development in the mass concrete construction of many industries such as water power, wind-powered electricity generation, petrochemical industry, highway, railway, bridge, harbour, airport, water conservancy, municipal administration, room are built, environment.

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.Rock-fill concrete is owing to adopt the form of construction work of piece stone layering stacking, self-compacting concrete slicing and filling; Therefore there is horizontal construction joint; Add the transverse joint on rock-fill concrete dam; These seam faces will be impervious weak links in the structure long-term safety running, and the quality of its anti-permeability performance directly influences the safety and the reliability of this class formation, and will be 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.For the rock-fill concrete 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 rock-fill concrete dam becomes a fast-developing key factor of restriction rock-fill concrete dam.

Summary of the invention

The technical problem that the utility model will solve provides the strong rock-fill concrete dam of a kind of barrier performance.

The technical scheme that addresses the above problem is: this rock-fill concrete 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 rock-fill concrete 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 rock-fill concrete 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-rock-fill 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 that rock-fill concrete dam construction technology was simple, and comprehensive unit price is low, and the aquation temperature rise is low; On-the-spot quality control is easy, and volume stability is good, is fit to mechanized construction; Advantages such as speed of application is fast, the polyurea materials of cooperation spraying " churning film " worker's method is 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 reasonability, economy and the safety on polyureas impervious barrier rock-fill concrete 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. rock-fill concrete dam, it is characterized in that: the upstream and downstream face at dam body is provided with the SPUA impervious barrier.

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

9. rock-fill concrete 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. rock-fill concrete 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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