CN203229927U - Treatment structure for dam body upstream face superficial layer temperature crack - Google Patents

Abstract

The utility model discloses a treatment structure for a dam body upstream face superficial layer temperature crack. A grouting layer fills up the crack in a poured mode, a water-stopping layer is embedded in a chisel groove on the surface of the crack, a rubber sheet is attached outside the surface of the chisel groove, and a seepage-proof covering piece covers the rubber sheet in a laid mode. A crack protecting structure comprises a concrete plate and cement-based waterproof layers, and the concrete plate wraps the outer surface and the periphery of the seepage-proof covering piece in a poured mode and is combined with a dam body through the cement-based waterproof layers. Comprehensive treatment is performed on the dam body upstream face superficial layer temperature crack in a blocking and preventing combination mode, respective excellent seepage-proof water-stopping performance of a chemical grouting material, a filling material, the rubber sheet and the seepage-proof covering piece are brought into full play, treatment effect of the crack is fully guaranteed, construction efficiency is high, blocking effect is good, overall consistency of the dam body can be restored, the seepage-proof requirements are met, and the surface crack can be prevented from further expanding to become the superficial layer crack.

Description

A treatment structure for shallow temperature cracks on the upstream surface of the dam body

technical field

The utility model belongs to the field of temperature crack treatment, in particular to a structure for treating temperature cracks in the shallow layer on the upstream surface of a dam body.

Background technique

Temperature cracks are one of the most common cracks in hydraulic concrete. According to statistics, there are few hydraulic structures without cracks. The existence of cracks will affect the beauty and life of the building, and damage the integrity of the building, endanger the safety structure of the building, cause water seepage, water leakage, and reduce the stability and safety factor of the building. Concrete cracks are given sufficient attention. Although the existence of most shallow temperature cracks will not pose a threat to the safe and stable operation of the dam, it is not ruled out that some shallow temperature cracks that were originally less harmful will extend due to differences in the location of the cracks and the external environment. If it expands and develops into a shallow or more serious deep or even penetrating fracture, once the fracture leaks, the subsequent treatment will become very difficult, and it is not cost-effective from the perspective of safety or economy.

For the shallow temperature cracks on the water-facing surface of the dam body, it is mostly caused by the annual temperature change and the sudden drop in winter temperature without taking insulation measures in advance. For the shallow temperature cracks on the water-facing surface of the dam body, the staff should not take it lightly. Check to find cracks in time, and then accurately analyze and study according to the location and scale of cracks to determine the correct and effective treatment plan. Simple methods should not be blindly adopted, which will result in labor-intensive, time-consuming and waste of funds.

Therefore, it is particularly important to study a construction system that can effectively deal with shallow temperature cracks on the upstream surface of the dam body.

Utility model content

Purpose of the utility model: The purpose of this utility model is to overcome the deficiencies of the prior art and provide a shallow water-facing surface of the upstream of the dam body that can improve the structural integrity and impermeability of the dam body through the treatment and protection of shallow temperature cracks. layer temperature crack treatment structure.

Technical solution: The structure for treating shallow temperature cracks on the upstream surface of the dam body according to the utility model includes a crack sealing structure and a crack protection structure. The crack sealing structure includes a grouting layer, a water-stop layer, a rubber sheet and The anti-seepage cover sheet, the grouting layer is poured and filled in the crack, the water-stop layer is embedded in the chiseled groove on the surface of the crack, the surface of the chiseled groove is covered with a rubber sheet, and the anti-seepage cover sheet is laid and covered on the rubber sheet; the crack protection structure includes a concrete slab and a cement-based waterproof layer, and the concrete slab is poured and wrapped on the outer surface of the anti-seepage cover sheet and its surroundings, and passes through the cement-based waterproof layer and the dam body combined.

Preferably, the grouting layer is an epoxy resin grouting layer. Epoxy resin series materials have a high elastic modulus, can effectively absorb the unfavorable stress on both sides of the crack, and are hydrophilic, reflecting the characteristics of being suitable for the wet environment of the dam body. Working ability, suitable for injection of fine cracks such as shallow temperature cracks.

Preferably, the polymer plastic water-stop layer made of polymer materials such as butyl rubber and silicone is embedded in the groove on the surface of the crack. The elongation of the polymer plastic water-stop layer is 800%~850%, which can be easily It is well adapted to the deformation when cracks are opened and closed due to temperature changes, and ensures the adhesion to the concrete on both sides of the crack.

In order to repair shallow temperature cracks that have not yet been stabilized, the rubber sheet is a neoprene sheet. The neoprene sheet has the characteristics of good elasticity and excellent impermeability. The crack widens further.

In order to cover the anti-seepage cover sheet on the rubber sheet and firmly attach it to the dam body through SR plastic water-stop material, the anti-seepage cover sheet is an SR anti-seepage cover sheet, which has the advantages of simple construction process, low cost and firm adhesion , has a good bonding effect on the dam body, and can replace the function of the traditional concrete cut-off wall on the upstream face of the dam body.

In order to repair the deep cracks submerged by water, a layer of polypropylene fiber concrete layer is sprayed on the outer surface of the cement-based waterproof layer.

Beneficial effects: 1. The utility model adopts the method of combining plugging and prevention to comprehensively control the shallow temperature cracks on the upstream surface of the dam body, and give full play to the excellent anti-seepage properties of chemical grouting materials, embedded filling materials, rubber sheets and anti-seepage cover sheets. The performance of seepage and water resistance can fully guarantee the treatment effect of cracks. The utility model has simple process, strong operability, fast construction efficiency, good sealing effect, can restore the overall consistency of the dam body, meet the anti-seepage requirements, and can also prevent surface cracks Further expand and develop into shallow cracks; 2. Use epoxy series materials for chemical grouting to fill the cracks, which has good groutability and a slightly larger specific gravity than water, so the grout can be used to top water, and can be used to pour water on the upstream surface of the dam body Cracks; 3. The joint use of SR anti-seepage cover sheet and SR plastic water-stop material can better adapt to the subsequent deformation of cracks, avoid stress damage by simply using anti-seepage cover sheet, high tensile strength, and further guarantee the quality of anti-seepage; 4. Spray KT1 cement-based anti-seepage material on the junction of the concrete slab and the dam body to make the concrete slab dense and waterproof. When cracks appear in the concrete later and water seeps in, it can achieve the function of self-repairing cracks.

Description of drawings

Figure 1 is a schematic front view of the shallow temperature cracks on the upstream surface of the dam body;

Figure 2 is a schematic side view of the shallow temperature cracks on the upstream surface of the dam body;

Fig. 3 is a structural schematic diagram of the utility model.

Detailed ways

The technical solutions of the utility model are described in detail below, but the protection scope of the utility model is not limited to the embodiments.

Embodiment: As shown in Figures 1 and 2, the shallow temperature cracks on the upstream surface of the dam body are shown in Figures 1 and 2. The crack 1 is located on the upstream surface of the dam body. The utility model is a treatment structure for the shallow temperature cracks on the upstream surface of the dam body, as shown in Figure 3. It includes the crack plugging structure and crack protection structure. The crack plugging structure includes a grouting layer, a water-stop layer 2, a rubber sheet 3 and an anti-seepage cover sheet 4. Firstly, chemical grouting is performed on the crack 1, and the grouting layer is grouted with epoxy resin. layer, remove debris on the surface of crack 1, lay soft grouting pipes along both sides of crack 1, and use the method of synchronous grouting for the entire joint to fill the entire joint with grout in a short period of time, and the epoxy resin grouting layer is filled in In the crack 1; a groove of 5 cm × 8 cm is chiseled on the surface of the crack 1, and a waterproof layer is embedded. The side concrete is well cemented; the surface of the chiseled groove is pasted with a rubber sheet 3, and the rubber sheet 3 is a neoprene sheet 3 with a width of 60 cm, which has the characteristics of good elasticity and good impermeability; the 8m wide area in the middle of the dam section is pasted with anti-corrosion The seepage cover sheet 4 is laid and covered on the rubber sheet 3, and the anti-seepage cover sheet 4 is made of SR anti-seepage cover sheet 4, combined with SR plastic water-stop material, which has a good bonding effect on the cracks 1 of the dam body;

The crack protection structure includes a concrete slab 5 and a cement-based waterproof layer 6, including the protection of both sides and the upper and lower ends of the crack. A concrete slab 5 with a thickness of 25 cm to 40 cm is cast and wrapped on the outer surface of the anti-seepage cover sheet 4 and its surroundings. Anchor the PVC board at the site, and backfill the deep and narrow V-shaped groove in the bedrock with concrete; in the range of 6.5m on both sides of the anti-seepage cover sheet 4, combine the concrete slab 5 with the dam body through the cement-based waterproof layer 6, and spray the cement-based waterproof layer 6. KT1 cement-based waterproof material is used to make the concrete dense and waterproof. When there are cracks in the concrete later or when water seeps in, it can achieve the function of self-repairing cracks; The surface of the waterproof layer 6 is sprayed with a polypropylene fiber concrete layer with a thickness of 8-10 cm, in order to repair the cracks 1 in places where the submerged water depth is relatively large.

As stated above, although the invention has been shown and described with reference to certain preferred embodiments, this should not be construed as limiting the invention itself. Various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (5)

1. a dam body upstream upstream face shallow-layer thermal cracking is handled structure, comprise crack plugging structure and crack safeguard structure, it is characterized in that: described crack plugging structure comprises grout blanket, sealing layer (2), sheet rubber (3) and antiseepage cover plate (4), described grout blanket pouring and filling is in crack (1), described sealing layer (2) is embedded in the raggle on surface, crack (1), the outer sheet rubber (3) that pastes in the surface of described raggle, described antiseepage cover plate (4) is laid and is covered on the described sheet rubber (3); Described crack safeguard structure comprises concrete slab (5) and cement-based waterproof layer (6), and described concrete slab (5) pouring ladle is rolled in the external surface of described antiseepage cover plate (4) and on every side, and is combined with dam body by described cement-based waterproof layer (6).

2. dam body according to claim 1 upstream upstream face shallow-layer thermal cracking is handled structure, and it is characterized in that: described grout blanket is the epoxy resin grouting layer.

3. dam body according to claim 1 upstream upstream face shallow-layer thermal cracking is handled structure, it is characterized in that: described sheet rubber (3) is neoprene rubber sheet (3).

4. dam body according to claim 1 upstream upstream face shallow-layer thermal cracking is handled structure, and it is characterized in that: described antiseepage cover plate (4) is SR antiseepage cover plate (4).

5. dam body according to claim 1 upstream upstream face shallow-layer thermal cracking is handled structure, it is characterized in that: the external surface of described cement-based waterproof layer (6) also adds spray one deck polypropylene fiber concrete layer.

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