Waterproof joint structure and construction method of the junction surface between new and old concrete structures

Abstract

The present invention discloses a waterproof node structure of a new and old concrete structure joint surface and a construction method thereof, wherein the waterproof node structure comprises a water-expandable bag arranged on a steel bar of the joint surface of the new and old concrete structure, the water-expandable bag being located at the thickness center of the joint surface of the new and old concrete structure, the water-expandable bag comprising a hot-melt film bag, an electric heating wire arranged on and led out of the hot-melt film bag, and a water-expandable slurry filled in the hot-melt film bag. The present invention can reduce the leakage risk of the joint surface of the new and old concrete structure and improve the anti-seepage performance.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering, and in particular to a waterproof node structure of a new and old concrete structure joint surface and a construction method thereof. Background Art

[0002] At present, cast-in-place concrete structures are the most common type of buildings. Due to the specifications, design and construction requirements, cast-in-place structures inevitably have a large number of interface surfaces between new and old concrete structures. The interface between the new and old concrete is usually treated with wire mesh or wire mesh plus water-stop steel plate at the construction joint. Before pouring new concrete, the steel bars at the construction joint must be rust-free and the old concrete surface must be roughened to ensure effective combination of the new and old concrete. Since there will be a lot of construction waste in the construction joint during the construction process, it is difficult to clean and roughen some locations with dense steel bars. Improper or incomplete treatment will lead to hidden dangers of water leakage in the later stage. Therefore, how to improve the anti-seepage performance of the interface between the new and old concrete structures has become a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0003] The purpose of the present invention is to provide a waterproof node structure of the joint surface of new and old concrete structures and a construction method thereof, so as to solve the problem of leakage risk of the joint surface of new and old concrete structures.

[0004] In order to solve the above technical problems, the present invention provides a waterproof node structure at the junction of new and old concrete structures, wherein a water-expandable bladder is arranged on the steel bars of the old concrete structure or on the steel bars of the new concrete structure at the junction of the new and old concrete structures, and the water-expandable bladder is located at the thickness center of the junction of the new and old concrete structures. The water-expandable bladder includes a hot-melt film bag, an electric heating wire arranged on and led out of the hot-melt film bag, and a water-expandable slurry filled in the hot-melt film bag.

[0005] Furthermore, in the waterproof node structure of the joint surface of the new and old concrete structures provided by the present invention, the water-expandable bag is in a bag shape after being sealed.

[0006] Furthermore, in the waterproof node structure of the joint surface of the new and old concrete structures provided by the present invention, the hot-melt film bag is in the shape of a rectangular body after being sealed.

[0007] Furthermore, in the waterproof node structure of the joint surface of the new and old concrete structures provided by the present invention, the hot-melt film bag is in a columnar shape after being sealed.

[0008] Furthermore, in the waterproof node structure of the joint surface of the new and old concrete structures provided by the present invention, the electric heating wire is a resistance heating wire.

[0009] Furthermore, in the waterproof node structure of the interface between new and old concrete structures provided by the present invention, the resistance heating wire is a straight line or a spiral line.

[0010] Furthermore, in the waterproof node structure of the joint surface of the new and old concrete structures provided by the present invention, the water-swellable slurry is organic bentonite.

[0011] Furthermore, in the waterproof node structure of the joint surface of the new and old concrete structures provided by the present invention, the electric heating wire is connected to an external power source.

[0012] In order to solve the above technical problems, the present invention also provides a construction method for the waterproof node structure of the above-mentioned new and old concrete structure joint surface, comprising:

[0013] A water-expandable bag is arranged on the steel bars of the old concrete structure or the new concrete structure at the interface between the new and old concrete structures, and the water-expandable bag is arranged at the thickness center of the interface between the new and old concrete structures so that the total length of the water-expandable bag is smaller than the thickness of the new and old concrete structures; the water-expandable bag includes a hot-melt film bag, an electric heating wire arranged on and led out of the hot-melt film bag, and a water-expandable slurry filled in the hot-melt film bag;

[0014] Pouring concrete on the steel bars at the interface between the new and old concrete structures and on the steel bars of the new concrete structure to form the interface between the new and old concrete structures and the new concrete structure;

[0015] After the poured concrete reaches the strength standard, an external power source is connected to the electric heating wire to heat the hot-melt film bag through the electric heating wire, so that the hot-melt film bag melts and releases water-swelling slurry on the bonding surface of the new and old concrete structures. When water penetrates into the bonding surface of the new and old concrete structures, the water-swelling slurry melts with water and expands into a paste to fill the construction joints of the bonding surface, so as to prevent water from penetrating and waterproof the bonding surface of the new and old concrete structures.

[0016] Furthermore, the construction method of the waterproof node structure of the junction surface of the new and old concrete structures provided by the present invention is characterized in that one or more water-swellable bags are arranged at the thickness center of the junction surface of the new and old concrete structures so that the total length of the water-swellable bags is smaller than the thickness of the new and old concrete structures.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a waterproof node structure for the junction surface of new and old concrete structures and a construction method thereof. A water-expandable bag composed of a hot-melt film bag, an electric heating wire and a water-expandable slurry is arranged on the steel bars on the junction surface of the new and old concrete structures. After the new concrete structure is constructed, the electric heating wire is heated to melt the hot-melt film bag and release the water-expandable slurry on the junction surface of the new and old concrete structures. The water-expandable slurry expands into a paste after contacting water, effectively filling the concrete pores at the construction joint of the junction surface, blocking the water seepage path, waterproofing the junction surface of the new and old concrete structures, thereby reducing the leakage risk of the junction surface of the new and old concrete structures and improving the anti-seepage performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram showing the waterproof node structure of the joint surface of the new and old concrete structures in use;

[0020] Figure 2 It is a schematic diagram of the structure of a water-expandable bladder;

[0021] As shown in the figure:

[0022] 100. Old concrete structure;

[0023] 200, water-expandable bladder, 210, hot-melt film bag, 220, electric heating wire, 230, water-expandable slurry;

[0024] 300. New concrete structure. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with the accompanying drawings: The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0026] Please refer to Figure 1 to Figure 2 The embodiment of the present invention provides a waterproof node structure of the interface between new and old concrete structures. A water-expandable bag 200 is arranged on the steel bars of the interface between the new and old concrete structures. The water-expandable bag 200 is located at the thickness center of the interface between the new and old concrete structures. The water-expandable bag 200 includes a hot-melt film bag 210, an electric heating wire 220 arranged on and led out of the hot-melt film bag 210, and a water-expandable slurry 230 filled in the hot-melt film bag 210. The water-expandable bag 200 can be arranged on the steel bars of the old concrete structure 100, or on the steel bars of the new concrete structure 300. The water-expandable slurry 230 can be organic bentonite.

[0027] In order to adapt to the joint surfaces of different sizes, the waterproof joint structure of the joint surface of the new and old concrete structures provided by the embodiment of the present invention is that the water-expandable bag 200 is in a bag shape, a rectangular shape, a column shape, etc. after being sealed. That is, the shape of the hot-melt film bag 210 after filling is in a bag shape, a rectangular shape, a column shape, etc.

[0028] In order to improve the water-stopping effect, the waterproof node structure of the junction surface of the new and old concrete structures provided in the embodiment of the present invention, the length of the water-swellable bag 200 is less than the thickness of the new and old concrete structures. Of course, the purpose of water-stopping can be achieved by constructing multiple water-swellable bags 200 on the junction surface to improve the water-stopping effect.

[0029] In order to achieve the purpose of heating the hot melt film bag 210, the waterproof node structure of the joint surface of the new and old concrete structures provided by the embodiment of the present invention, the electric heating wire 220 can be a linear or spiral resistance heating wire. The electric heating wire 220 is heated by an external power supply to melt the hot melt film bag 210. The spiral electric heating wire 220 can improve the heating efficiency and make the hot melt film bag 210 melt quickly.

[0030] The embodiment of the present invention further provides a construction method for the waterproof node structure of the above-mentioned new and old concrete structure joint surface, which may include the following steps:

[0031] Step 401, a water-expandable bag is arranged on the steel bars of the old concrete structure or the new concrete structure at the interface between the new and old concrete structures, and the water-expandable bag is arranged at the thickness center of the interface between the new and old concrete structures, so that the total length of the water-expandable bag is less than the thickness of the new and old concrete structures; the water-expandable bag includes a hot-melt film bag, an electric heating wire arranged on and led out of the hot-melt film bag, and a water-expandable slurry filled in the hot-melt film bag. One or more water-expandable bags can be arranged at the thickness center of the interface between the new and old concrete structures, so that the total length of the water-expandable bag is less than the thickness of the new and old concrete structures.

[0032] Step 402, pouring concrete on the steel bars at the interface between the new and old concrete structures and on the steel bars of the new concrete structure to form the interface between the new and old concrete structures and the new concrete structure.

[0033] Step 403, after the poured concrete reaches the strength standard, an external power source is connected to the electric heating wire to heat the hot melt film bag through the electric heating wire, so that the hot melt film bag is melted and releases water-swellable slurry on the bonding surface of the new and old concrete structures. When water penetrates into the bonding surface of the new and old concrete structures, the water-swellable slurry melts with water and expands into a paste to fill the construction joint of the bonding surface, so as to prevent water from penetrating and waterproof the bonding surface of the new and old concrete structures.

[0034] The waterproof node structure and construction method of the interface between the new and old concrete structures provided by the embodiment of the present invention are as follows: a water-expandable bag 200 composed of a hot-melt film bag 210, an electric heating wire 220 and a water-expandable slurry 230 is arranged on the steel bars of the interface between the new and old concrete structures; after the new concrete structure 300 is constructed, the hot-melt film bag 210 is melted by heating the electric heating wire 220 to release the water-expandable slurry 230 on the interface between the new and old concrete structures; the water-expandable slurry 230 expands and becomes a paste after contacting water, effectively filling the concrete pores at the construction joint of the interface, blocking the water seepage path, waterproofing the interface between the new and old concrete structures, reducing the leakage risk of the interface between the new and old concrete structures, and improving the anti-seepage performance. The water-expandable bag 200 can avoid the use of the usual grouting method, and the slurry cannot effectively stop water in the later stage after hardening and forming once. The water-expandable bag 200 is similar to the principle of a capsule, and the water-expandable slurry 230 must be in a dry state when filling.

[0035] The present invention is not limited to the above-mentioned specific implementation modes. Obviously, the above-mentioned embodiments are only some embodiments of the embodiments of the present invention, but not all embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention. Those skilled in the art can make other levels of modifications and changes to the present invention. In this way, if these modifications and changes of the present invention fall within the scope of the claims of the present invention, the present invention is also intended to include these changes and changes.

Claims

1. A waterproof node structure for the joint surface of new and old concrete structures, characterized in that: A water-expandable bag is arranged on the steel bars of the old concrete structure at the interface between the new and old concrete structures or on the steel bars of the new concrete structure. The water-expandable bag is located at the thickness center of the interface between the new and old concrete structures. The water-expandable bag includes a hot-melt film bag, an electric heating wire arranged on and led out of the hot-melt film bag, and a water-expandable slurry filled in the hot-melt film bag.

2. The waterproof node structure of the joint surface of the new and old concrete structures according to claim 1 is characterized in that: The water-expandable bag is in a bag shape after being closed.

3. The waterproof node structure of the joint surface of the new and old concrete structures according to claim 1 is characterized in that: The hot-melt film bag is in a rectangular shape after being closed.

4. The waterproof node structure of the joint surface of the new and old concrete structures according to claim 1 is characterized in that: The hot-melt film bag is in a cylindrical shape after being sealed.

5. The waterproof node structure of the joint surface of the new and old concrete structures according to claim 1 is characterized in that: The electric heating wire is a resistance heating wire.

6. The waterproof node structure of the joint surface of the new and old concrete structures according to claim 5 is characterized in that: The resistance heating wire is a straight line or a spiral line.

7. The waterproof node structure of the joint surface of the new and old concrete structures according to claim 1 is characterized in that: The water-swellable slurry is organic bentonite.

8. The waterproof node structure of the joint surface of the new and old concrete structures according to claim 1 is characterized in that: The electric heating wire is connected to an external power source.

9. A construction method for a waterproof node structure at the interface between new and old concrete structures according to any one of claims 1 to 7, characterized in that: include: A water-expandable bag is arranged on the steel bars of the old concrete structure or the new concrete structure at the interface between the new and old concrete structures, and the water-expandable bag is arranged at the thickness center of the interface between the new and old concrete structures so that the total length of the water-expandable bag is smaller than the thickness of the new and old concrete structures; the water-expandable bag includes a hot-melt film bag, an electric heating wire arranged on and led out of the hot-melt film bag, and a water-expandable slurry filled in the hot-melt film bag; Pouring concrete on the steel bars at the interface between the new and old concrete structures and on the steel bars of the new concrete structure to form the interface between the new and old concrete structures and the new concrete structure; After the poured concrete reaches the strength standard, an external power source is connected to the electric heating wire to heat the hot-melt film bag through the electric heating wire, so that the hot-melt film bag melts and releases water-swelling slurry on the bonding surface of the new and old concrete structures. When water penetrates into the bonding surface of the new and old concrete structures, the water-swelling slurry melts with water and expands into a paste to fill the construction joints of the bonding surface, so as to prevent water from penetrating and waterproof the bonding surface of the new and old concrete structures.

10. The construction method of the waterproof node structure of the interface between new and old concrete structures according to claim 9, characterized in that: One or more water-expandable bags are arranged at the thickness center of the joint surface of the new and old concrete structures so that the total length of the water-expandable bags is smaller than the thickness of the new and old concrete structures.

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