CN104060576B - Concrete for hydraulic structure member expansion joint waterstop repairs attachment structure and method for repairing and connecting - Google Patents

Abstract

The invention proposes a connection structure and connection method of hydraulic concrete member expansion joint waterstop, which includes a protective layer and a sealing filling layer, the sealing filling layer is filled in the expansion joint at the damaged part of the waterstop, the protective A layer wraps the sealing filling layer and the outer side of the end of the damaged waterstop, and is combined with the end. The sealing filling layer preferably closes the seam of the damaged part, and can provide the required supporting function for the protective layer. The protective layer can be directly formed by coating a flexible membrane material on site, so as to be closely combined with the end of the waterstop directly. It is better to apply activator and adhesive between the protective layer and the waterstop. The invention can solve the connection problem of the damaged part of the waterstop in the expansion joint of the hydraulic concrete member. Compared with the conventional process of chiseling and replacing the waterstop, it is simple and easy, and the performance of the waterstop is intact after the connection.

Description

Repair connection structure and repair connection method of hydraulic concrete member expansion joint waterstop

technical field

The invention relates to a repair or connection structure of a hydraulic concrete component expansion joint waterstop and a corresponding connection method.

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 present invention proposes a connection structure and connection method for expansion joint waterstops of hydraulic concrete components.

Contents of the invention

In order to solve the above technical problems, the hydraulic concrete member expansion joint waterstop connection structure of the present invention includes a protective layer and a sealing filling layer, and the sealing filling layer is filled in the expansion joint at the damaged part of the waterstop, preferably The seam is closed, and the protection layer covers the sealing filling layer and the outer side of the damaged waterstop, and is combined with the end.

Preferably, the sealing filling layer is a flexible caulking material.

Flexible caulking material 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 protective layer is formed from a flexible film material.

The characteristics of the selected flexible membrane material are that it has flexibility, high tensile strength, good water resistance and corrosion resistance.

Preferably, the protective layer further comprises reinforcing fibers disposed within the flexible film material.

Preferably, the protective layer is formed on site by applying a flexible membrane material to the outside of the seal packing layer and the waterstop head.

Preferably, the flexible film material is a polyurea series material.

Preferably, the protective layer has a width greater than that of the water stop, and the protective layer overlaps with the end of the water stop.

Preferably, the overlapping length of the protective layer covering the end of the waterstop 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 protective layer is not less than 4 mm.

Preferably, the protective layer is combined with the end of the waterstop by applying an activator and/or an adhesive.

The present invention also provides a water-stop connection method for expansion joints of hydraulic concrete members, which includes the following steps:

(1) Fill a sealing filling layer in the expansion joint at the damaged part of the waterstop, preferably to close the seam;

(2) Cover the outside of the sealing filling layer and the damaged end of the waterstop with a flexible membrane material to form a protective layer.

In the method described above, the protective layer has a width greater than that of the waterstop, and the protective layer has an overlapping portion with the end of the waterstop.

The above-mentioned method further includes a pretreatment step between step (1): cutting grooves from the surface of the hydraulic concrete member to expose both ends of the waterstop where the waterstop is damaged.

In the above method, after step (2), the groove is refilled with cement mortar to make the surface of the hydraulic concrete member level.

According to the above-mentioned method, the protective layer is formed by coating the outer side of the sealing filling layer and the damaged end of the waterstop on site with a flexible film material.

As in the method described above, the protective layer consists of a flexible membrane material and a fibrous reinforcement material. The specific way can be, in the process of coating the flexible film material, adding reinforcing fiber or fiber cloth to the coating material, or directly laying reinforcing fiber or fiber cloth in the uncured coating , or spread the reinforcing fiber or fiber cloth on the outside of the two ends of the damaged part of the waterstop and the surface of the sealing filling layer in advance, and then paint the liquid flexible membrane material on the reinforcing fiber or fiber cloth , and then solidify into shape.

According to the above method, the overlapping length of the protective layer covering the end of the waterstop 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 protective layer is not less than 4 mm.

The above-mentioned method further includes a treatment step of applying an activator and/or an adhesive to the surface of the damaged end of the waterstop between step (1) and step (2).

Concrete advantage of the present invention is as follows:

1. In the present invention, between the expansion joints of the concrete members at the damaged part of the waterstop, the sealing filling layer formed by the flexible caulking material is used to seal the expansion joint surface; the protective layer used to support the outer layer is used as the protective layer on site Forming with a flexible membrane material provides a support surface. At the same time, the existence of the 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 connection 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 components at all.

2. The protective layer of the present invention can be formed by coating the film-forming material on the end of the waterstop and the outside of the sealing filling layer on the spot, so that the protective layer is directly connected to the end of the waterstop when it is formed.

The surface of the waterstop is usually provided with protrusions to enhance the anti-seepage effect and adapt to the deformation of expansion joints. 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 strength of the protective layer is enhanced 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 protective layer covering the end of the waterstop 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 protective layer is not less than 4 mm, which can increase the firmness of the connection structure of the waterstop Degree and anti-seepage effect.

5. Brush the surface of the end of the waterstop with activator and/or adhesive to improve the bonding strength between the protective coating and the waterstop.

Description of drawings

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

Figure 2 is a schematic plan view of the connection structure of the expansion joint waterstop of the hydraulic concrete member.

Fig. 3 is an A-A sectional view of the connection structure of the expansion joint waterstop of the hydraulic concrete member.

Fig. 4 is a B-B sectional view of the connection structure of the expansion joint waterstop of the hydraulic concrete member.

Description of symbols:

1-Seal filling layer 2 Waterstop 21 Waterstop end

3-protective layer 4-concrete member 5expansion joint

6- Rectangular groove m The width of both sides of the protective layer beyond the waterstop n The overlapping length of the protective layer and the end of the waterstop.

detailed description

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 from the damaged part to the outer surface is first chiseled to form The rectangular groove 6 exposes the end 21 of the waterstop 2 (or by cutting off the damaged part to form a relatively neat end 21 on both sides, which is a known means here, so it will not be described in detail), while paying 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 of the two waterstops 2 is filled with a sealing filling layer 1 made of flexible caulking material (see Figure 2 and Figure 3), wherein the height of the sealing filling layer 1 can be slightly higher than the expansion joint. The groove surfaces on both sides of the slit 5 are preferably to close the slit of the expansion joint 5 . Then use liquid flexible membrane material to coat the outside of the end 21 of the waterstop and the sealing filling layer 1 on site to form a protective layer 3 to cover the ends 21, sealing filling layer 1 and the sealing filling layer 1 on both sides. The bottom surface of the groove on both sides of the damaged seam (see Figure 3-4). During the coating process, flexible fiber reinforcements, such as flexible fibers or fiber cloth, can be added to the coating material to increase the protective layer. The strength and stress resistance of the structure; wherein, the scope of coating the flexible membrane material includes the ends 21 on both sides of the waterstop 2, the sealing filling layer 1, and the concrete groove surfaces on both sides of the expansion joint (as shown in Figure 2 Show). Before coating, the upper surface of the end 21 of the waterstop 2 can also be coated with activator and/or adhesive, so that the overlap between the protective layer 3 and the end 21 of the waterstop 2 is filled with The activator or adhesive is sufficient, so as to improve the bonding strength and sealing performance between the protective layer 3 and the ends 21 on both sides of the waterstop 2 . As shown in Figure 2, the protective layer 3 covers (coats) the length n of the end 21 of the waterstop not less than 15 cm (also refers to the overlapping length), and the protective layer 3 covers a width m beyond the waterstop 2 of not less than 5 cm. cm, the thickness of the protective 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 protective layer 3 is formed by coating a flexible film material on site, so that the formed protective layer 3 can be closely combined with the ends 21 on both sides of the waterstop 2, and the sealing filling layer 1 can be coated and formed on site. The protective layer 3 provides the necessary support surface and increases the water pressure resistance of the connection structure; in addition, due to the existence of the sealing filling layer 1, the protective layer 3 is in the direction perpendicular to the expansion joint opening (across the opening of the joint) Direction), has greater stretchability. Wherein, the flexible film material may be selected from polyurea series materials.

Wherein, the process of forming the protective layer 3 by coating the flexible film material on site may be, in the process of coating the flexible film material, adding reinforcing fiber or fiber cloth to the coating material, or Lay the reinforcing fiber or fiber cloth directly in the uncured coating, or lay the reinforcing fiber or fiber cloth on the outside of the two ends 21 of the damaged part of the waterstop and the surface of the sealing filling layer 1 in advance, and then The liquid flexible membrane material is painted on the reinforcement fiber or fiber cloth, and then solidified and shaped.

The above-mentioned embodiment is only the best implementation mode of the present invention, wherein the forming method of the protective layer 3 is not limited to the method of on-site coating, and can also be preformed off-site with flexible film-forming materials and flexible fibers (reinforcement described above) fiber or fiber cloth) to form a protective layer 3 of a predetermined size, and then cover and bond the sealing filling layer 1 and the outside of the end 21 of the waterstop 2, and use an adhesive or a special activator to make it compatible with the waterstop The ends 21 of the strip 2 are glued tightly together.

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, on the basis of the above description, other changes or changes in different forms can also be made. 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 (4)

1. a concrete for hydraulic structure member expansion joint waterstop method for repairing and connecting, it comprises the steps:

(1) from concrete for hydraulic structure component surface raggle to expose the termination, waterstop both sides of this waterstop breakage；

(2) in the expansion joint of this waterstop breakage, fill a sealing packed layer, close sealing at this；

(3) to cross cut end (of a beam) brushing activator and the binding agent of this waterstop breakage；

(4) in one layer of protection being made up of flexible film material of termination outer side covers of this sealing packed layer and this waterstop breakage Layer, the width of this overcoat is more than the width of this waterstop, and the termination of this overcoat and this waterstop has and partly overlaps；

(5) again backfilling this groove by cement mortar makes concrete for hydraulic structure component surface smooth.

A kind of concrete for hydraulic structure member expansion joint waterstop method for repairing and connecting the most according to claim 1, its feature exists In, this overcoat is by field-applied liquid flexible film material outside the termination of this sealing packed layer and this waterstop breakage Material, the mode of resolidification molding and formed.

A kind of concrete for hydraulic structure member expansion joint waterstop method for repairing and connecting the most according to claim 1, its feature exists In, this overcoat is made up of flexible film material and fiber reinforced material.

4. an attachment structure repaired by concrete for hydraulic structure member expansion joint waterstop, and its feature includes: an overcoat and seals Packed layer, this sealing packed layer is filled in the expansion joint of waterstop breakage, this overcoat be coated on this sealing packed layer and Outside the termination of this waterstop breakage, and combining with this termination, this sealing packed layer is flexible caulking material, this overcoat Being to be made up of flexible film material and the reinforcing fiber of being located in this flexible film material, described flexible film material is polyureas material Material, the overlap length of described overcoat cladding waterstop termination is not less than 15 centimetres, and both sides are no less than 5 beyond this waterstop width Centimetre, the thickness of described overcoat is no less than 4 millimeters.