CN203960812U - Hydraulic concrete structure shrinkage joint embedded water stop band repair structure - Google Patents

Abstract

The utility model proposes a pre-buried waterstop repair structure for expansion joints of hydraulic concrete structures, which includes an anti-seepage layer and a flexible caulking layer, and the flexible caulking layer is filled in expansion joints at damaged waterstops. Close the seam at the place, the anti-seepage layer is covered on the outer side of the flexible caulking layer and the damaged part of the water-stop, the width of the anti-seepage layer is greater than the width of the water-stop, and the anti-seepage layer There is a partial overlap with the end of the waterstop. The flexible caulking layer can provide the required support for the anti-seepage layer; and the anti-seepage layer can be directly formed by coating the film-forming material on site, so as to be directly combined with the end of the waterstop . The anti-seepage layer may be composed of film-forming paint and reinforcing fibers, and the reinforced fibers are used to prevent stress concentration of the formed anti-seepage layer. The utility model can solve the problem of repairing the damaged part of the expansion joint waterstop of the hydraulic concrete member, so as to achieve the economic benefits of saving money and labor.

Description

Rehabilitation structure of pre-embedded waterstops in expansion joints of hydraulic concrete structures

technical field

The invention relates to a repairing or repairing structure of a hydraulic concrete component expansion joint waterstop.

Background technique

Expansion joints are usually provided on the concrete components of hydraulic structures such as hydropower stations, water conveyance channels, water conveyance tunnels and water conveyance aqueducts. Expansion joints refer to the gaps set in the structure to accommodate the impact of material expansion and contraction deformation on the structure. Common measures to solve the anti-seepage of expansion joints at home and abroad are to pour the two wings of the rubber waterstop or plastic waterstop into the concrete on both sides of the expansion joint, or use flat steel and bolts to seal the rubber waterstop or plastic waterstop into the concrete. The belt is twisted across the seam and pressed on both sides of the seam. As shown in Fig. 1, the two wings of the waterstop 2 are respectively poured into the concrete 4 on both sides of the expansion joint 5, which has a certain distance from the outer surface of the concrete. Generally, rubber waterstops or plastic waterstops are usually connected by using professional connectors, such as hot-melt welding machines for vulcanization or thermal connection; when hydraulic structures have been in operation for many years, these waterstops may be broken and damaged , these breaks and damages need to be repaired. When connecting waterstops at partially broken and damaged places, it is difficult to implement with professional connectors due to limited operating space.

The requirements for the treatment of these fractured and damaged waterstops, on the one hand, must have a good water-stop and anti-seepage effect and be able to withstand a corresponding degree of water pressure; on the other hand, since the width of the expansion joint is in a dynamic state of change, it must The structure is able to adapt to its deformation. Therefore, the repair and connection of expansion joints and waterstops of hydraulic concrete members has always been a technical difficulty in the hydraulic field; this difficulty becomes particularly prominent when there is a pressure of tens of meters or even hundreds of meters of water head.

The common measure to solve this problem at home and abroad is to remove and replace the entire waterstop, which is time-consuming and labor-intensive, and the material and labor costs are too high.

To sum up, in order to solve the deficiencies of the prior art, the utility model proposes a repair structure for pre-embedded waterstops in the expansion joints of hydraulic concrete structures.

Utility model content

In order to solve the above technical problems, the utility model provides a hydraulic concrete structure expansion joint pre-embedded waterstop repair structure, which includes an anti-seepage layer and a flexible caulking layer, the flexible caulking layer is filled in the damaged waterstop In the expansion joint at the location, the seam at the location is closed. The anti-seepage layer covers the flexible caulking layer and the outer sides of the damaged waterstop. The width of the anti-seepage layer is larger than that of the waterstop. width, and the anti-seepage layer partially overlaps with the end of the waterstop.

The material of the flexible caulking layer is a kind of caulking material commonly used in civil engineering, and its characteristic is that it can maintain a certain degree of weakness without affecting the normal expansion and contraction response of concrete components.

Preferably, the anti-seepage layer is composed of film-forming paint and reinforcing fibers.

The material characteristics of the selected film-forming coating are that it has flexibility and high tensile strength, good water resistance and corrosion resistance.

Preferably, the anti-seepage layer is obtained by adding reinforcing fiber or fiber cloth to the coating during the process of scraping the film-forming coating on the end of the waterstop and the outside of the flexible caulking layer on site, Or directly lay the reinforcing fiber or fiber cloth in the uncured paint coating and then cure it to shape, or lay the reinforcing fiber at the end of the waterstop and the outside of the flexible caulking layer, and then place it on the reinforcing fiber The strong fiber is coated with the film-forming paint and cured to form a shape.

Preferably, the anti-seepage layer is formed by mixing the film-forming paint with reinforcing fibers off-site and then curing.

Preferably, the film-forming coating is a one-component polyurea series material.

Preferably, the length of the end of the waterstop covered by the anti-seepage layer is not less than 15 cm, and the two sides exceed the width of the waterstop by not less than 5 cm.

Preferably, the thickness of the anti-seepage layer formed by scraping coating is not less than 4 mm.

Preferably, an activator and/or an adhesive are applied between the overlapping parts of the anti-seepage layer and the ends on both sides of the waterstop.

Preferably, a wet concrete interface agent is applied between the anti-seepage layer and the concrete surfaces on both sides of the expansion joint.

The construction method of the above-mentioned hydraulic concrete structure expansion joint pre-buried waterstop repair structure of the utility model is as follows:

(1) Cut grooves from the surface of hydraulic concrete components to expose the ends of both sides of the waterstop where the waterstop is damaged;

(2) Fill a flexible caulking layer in the expansion joint where the waterstop is damaged, preferably to close the seam;

(3) Cover the outer side of the flexible caulking layer and the damaged end of the waterstop with a flexible film-forming material to form an anti-seepage layer;

(4) Backfill the groove with cement mortar again to make the surface of hydraulic concrete components smooth.

As in the method described above, the barrier layer consists of a flexible film-forming material and a fibrous reinforcement. Preferably, during the process of coating the flexible film-forming material, reinforcing fibers or fiber cloths are added to the film-forming coating material, or the reinforcing fibers or fiber cloths are directly laid on the uncured flexible film-forming material. The film-forming material coating is solidified and formed; or after the reinforcing fiber or fiber cloth is spread on the outside of the two ends of the damaged waterstop and the surface of the flexible caulking layer, and then the reinforcing fiber or fiber Brush the liquid film-forming paint on the top of the cloth and solidify it into shape.

The utility model concrete advantage is as follows:

1. The utility model is to seal the expansion joint surface with a flexible caulking layer formed by a flexible caulking material between the expansion joints of concrete members at the damaged part of the waterstop; the anti-seepage layer used to support the outer layer is the anti-seepage layer The support surface is provided by molding in-situ with a flexible membrane material. At the same time, the existence of flexible caulking material makes the protective film more extensible in the direction perpendicular to the seam (the direction across the seam). This measure can not only improve the water pressure resistance of the overall anti-seepage structure, but also increase the ability of the repaired structure of the waterstop to adapt to the change of the joint opening, and will not affect the normal expansion and contraction of the concrete member at all.

2. The anti-seepage layer of the utility model can be formed by coating the film-forming material on the end of the waterstop and the outside of the flexible caulking layer on site, so that the anti-seepage layer can be directly connected with the end of the waterstop while curing and forming.

The surface of the waterstop is usually provided with protrusions that can enhance the anti-seepage effect and adapt to the deformation of the expansion joint. These waterstop protrusions can be directly covered by on-site coating of film-forming materials, so that it can adapt to various waterstops The complex protrusions on the surface have an excellent sealing effect; on the other hand, the concrete surface below the waterstop is usually damaged and uneven due to the partial removal of the damaged waterstop. The uneven concrete surface, its construction process is simple, and the sealing effect is ideal.

3. The anti-seepage layer can enhance the strength of the anti-seepage layer by adding flexible fibers and/or fiber cloth as a reinforcing layer, which can reduce stress concentration and further improve the water pressure resistance and external damage resistance of the overall anti-seepage structure.

4. The length of the end of the waterstop covered by the anti-seepage layer is not less than 15 cm, the width of the waterstop on both sides is not less than 5 cm, and the thickness of the anti-seepage layer is not less than 4 mm, which can increase the firm connection of the repair structure of the waterstop Degree and anti-seepage effect.

5. The surface of the end of the waterstop is painted with activator and adhesive, and a wet concrete interface agent is painted between the anti-seepage layer and the concrete to improve the contact between the anti-seepage layer, the waterstop and concrete. Adhesive strength, enhanced sealing.

Description of drawings

Figure 1 is a schematic diagram of the installation position of the expansion joint waterstop of the hydraulic concrete member.

Fig. 2 is a schematic plan view of the repair structure of the pre-embedded waterstop in the expansion joint of the hydraulic concrete structure.

Fig. 3 is an A-A cross-sectional view of the repair structure of the pre-embedded waterstop in the expansion joint of the hydraulic concrete structure.

Fig. 4 is a B-B sectional view of the repair structure of the pre-embedded waterstop in the expansion joint of the hydraulic concrete structure.

Description of symbols:

1-flexible caulking layer 2 waterstop 21 end of waterstop

3- Seepage prevention layer 4- Concrete member 5 Expansion joint

6- Rectangular groove m The width of both sides of the anti-seepage layer beyond the waterstop n The length of the overlap between the anti-seepage layer and the end of the waterstop.

Detailed ways

As shown in Figures 2-4, when the waterstop 2 pre-embedded in the concrete on both sides of the expansion joint 5 in the hydraulic concrete member 4 is partially damaged, the concrete at the damaged part is chiseled out first to form a rectangular groove 6, Make the end 21 of the waterstop 2 exposed (or cut off the damaged part to form relatively neat ends 21 on both sides, this is a known method, so it will not be described in detail), and at the same time, pay attention to protecting the remaining undamaged waterstop 2 , so as not to be damaged by concrete waste. The expansion joint 5 between the ends 21 on both sides of the waterstop 2 is filled with a flexible caulking layer 1 made of flexible caulking material (see Figure 3), wherein the height of the flexible caulking layer 1 can slightly protrude from The groove surfaces on both sides of the expansion joint 5 are preferably closed to prepare for the formation of the anti-seepage layer 3; then the liquid flexible film-forming material is applied to the end of the waterstop on site 21. Form an anti-seepage layer 3 on the outer side of the flexible caulking layer 1 (see Figure 3-4). During the coating process, add flexible fiber reinforcements, such as flexible fibers or fiber cloth, to the coating material , to increase the strength and stress resistance of the anti-seepage layer 3 forming structure; wherein, the scope of coating the flexible membrane material includes the ends 21 on both sides of the waterstop 2, the flexible caulking layer 1, and the two sides of the expansion joint 5 The concrete bottom surface of the groove 6 on the side (as shown in Figure 2). Before coating, activator and/or binding agent can also be brushed on the surface of the end 21 of the waterstop 2, and at the same time, the surface of the groove surface concrete on both sides of the seam is also coated with a moist concrete interface agent to achieve The activator and/or adhesive is filled between the overlapping parts of the anti-seepage layer 3 and the ends of the waterstop 2, and the moisture is filled between the anti-seepage layer 3 and the bottom concrete surface of the grooves 6 on both sides of the seam. Type concrete interface agent, in order to improve the bonding strength between the protective coating 3 and the end 21 of the waterstop 2, between the anti-seepage layer 3 and the concrete, and effectively improve the sealing performance and the water pressure resistance of the repaired place. As shown in Figure 2, the anti-seepage layer 3 covers (coats) the length n of the end 21 of the waterstop is not less than 15 cm (also refers to the overlapping length), and the anti-seepage layer 3 covers a lot beyond the width m of the waterstop 2 less than 5 cm, and the thickness of the anti-seepage layer 3 itself is not less than 4 mm. After the above process is completed, the rectangular groove 6 is backfilled with cement mortar again. In the present invention, the anti-seepage layer 3 is formed by coating the flexible membrane material on site, so that the anti-seepage layer 3 can be directly combined with the ends 21 on both sides of the waterstop 2 during the curing process, and the flexible caulking layer 1 can provide a supporting surface and a feeding surface for on-site coating and forming of the anti-seepage layer 3, and after the formation of the anti-seepage layer 3, the flexible caulking layer 1 can also increase the water pressure resistance of the repaired structure; at the same time, the flexibility The presence of the caulking layer 1 enables the anti-seepage layer 3 to have greater extensibility in the direction perpendicular to the expansion joint (the direction across the joint).

Wherein, the flexible film material may be selected from polyurea series materials.

The above-mentioned embodiment is only the best implementation mode of the present invention, wherein the forming method of the anti-seepage layer 3 is not limited to the way of on-site coating, and can also be preformed with a flexible film-forming material and flexible fibers outside the site to form a pre-determined anti-seepage layer. After the seepage layer 3, it is covered on the outside of the end 21 of the flexible caulking layer 1 and the waterstop 2, and the activator and/or adhesive is filled between the end 21 and the overlapping part of the anti-seepage layer 3, Apply wet concrete interface agent on the concrete bottom surface on both sides of the slot 6, so that the anti-seepage layer 3 and the end 21 of the waterstop 2, the anti-seepage layer 3 and the concrete groove surface on the side of the slot can be tightly sealed. Bond together firmly to improve the sealing performance of the repaired structure.

The above-mentioned embodiments are only examples for clearly illustrating the present invention, rather than limiting the specific implementation manner of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. However, any obvious change or variation derived within the spirit and principle of the present invention is still within the protection scope of the claims of the present invention.

Claims (9)

1. a hydraulic concrete structure shrinkage joint embedded water stop band repair structure, it is characterized in that, it comprises an impervious barrier and a flexible filleting layer, this flexibility filleting layer is filled in the shrinkage joint of waterstop breakage, seal the sealing at this place, this impervious barrier is coated on termination, the both sides outside of this flexibility filleting layer and this waterstop breakage, and the width of this impervious barrier is greater than the width of this waterstop, and the termination of this impervious barrier and this waterstop has and partly overlaps.

2. a kind of hydraulic concrete structure according to claim 1 shrinkage joint embedded water stop band repair structure, is characterized in that, described impervious barrier is made up of film forming coatings and reinforcing fiber.

3. a kind of hydraulic concrete structure according to claim 2 shrinkage joint embedded water stop band repair structure, it is characterized in that, described impervious barrier is by the scene outside the termination of this waterstop and this flexibility filleting layer in the process of this film forming coatings of blade coating, reinforcing fiber or cloth are added in this coating, or directly reinforcing fiber or cloth are laid on to the moulding through solidifying again in not solidified paint coatings, or behind the termination and this flexibility filleting layer outside paving reinforcing fiber of this waterstop, above this reinforcing fiber, brush again this film forming coatings and solidify and moulding.

4. a kind of hydraulic concrete structure according to claim 2 shrinkage joint embedded water stop band repair structure, is characterized in that, described impervious barrier is by solidifying and moulding after being mixed with reinforcing fiber by this film forming coatings outside the venue.

5. according to a kind of hydraulic concrete structure shrinkage joint embedded water stop band repair structure described in claim 2 or 3 or 4, it is characterized in that, described film forming coatings is one pack system polyureas series material.

6. a kind of hydraulic concrete structure according to claim 1 shrinkage joint embedded water stop band repair structure, is characterized in that, the length of the coated waterstop termination of described impervious barrier is not less than 15 centimetres, and both sides exceed waterstop width and are no less than 5 centimetres.

7. a kind of hydraulic concrete structure according to claim 3 shrinkage joint embedded water stop band repair structure, is characterized in that, the impervious barrier thickness after blade coating moulding is not less than 4 millimeters.

8. a kind of hydraulic concrete structure according to claim 1 shrinkage joint embedded water stop band repair structure, is characterized in that, between described impervious barrier and the overlapping part of termination, described waterstop both sides, is coated with and is brushed with activator and/or cementing agent.

9. according to a kind of hydraulic concrete structure shrinkage joint embedded water stop band repair structure described in claim 1 or 8, it is characterized in that, between this impervious barrier and the concrete surface of these both sides, shrinkage joint, be coated with and be brushed with moist type concrete interface agent.