Water-stopping structure for new and old concrete structures

Abstract

The utility model discloses a kind of water stop structures for between new and old concrete structures, including old concrete structure, new concrete structure and the water stop piece being set between both;Old new concrete structure is arranged side by side, and the water face of both is provided with fastening reinforcement layer;The side surface of old concrete structure is provided with mounting groove below fastening reinforcement layer, its opening is oppositely arranged with new and old structure joint, lower side wall is gradually inclined to the plane structure of new and old structure joint direction downwards;Water stop nose of water stop piece is set in new and old structure joint, one side flap of water stop piece is attached on lower side wall and is fixedly connected therewith, the other side flap of water stop piece is set in new concrete structure;Cement mortar backfill layer is set in mounting groove, and sealing rubber plugging layer is set at the entrance of new and old structure joint.The utility model is simple in structure, easy to construction, and structure is safe and reliable, stable and durable, and water stop effect is good, very suitable for danger removal and reinforcement and reconstruction promotion of water conservancy project.

Description

Technical Field

[0001] This utility model relates to the field of water conservancy engineering technology, and in particular to a water-stopping structure for use between new and old concrete structures. Background Technology

[0002] The Ministry of Water Resources is making every effort to promote the construction of water conservancy infrastructure. After long-term operation, most water conservancy projects have now entered the stage of reinforcement, renovation, and upgrading. In practice, a safety assessment is usually conducted first, retaining the qualified parts of the old concrete structure, and then constructing a new concrete structure on this basis. A water-stop structure needs to be installed at the joint between the old and new concrete, and the quality of the water-stop structure directly affects the quality, safety, and effectiveness of the project. There are two main existing methods for water-stop installation: The first method involves chiseling a rectangular groove 2' on the water-facing surface of the old concrete structure 1', and then installing a water-stop plate 3' at the joint between the old and new concrete (see...). Figure 1 , 2 The second method involves attaching one end of the waterstop 3' to the surface of the old concrete 1' joint, and casting the other end into the new concrete structure 4' (see...). Figure 3 , 4 The former method cuts off the reinforcing steel in the concrete surface layer, affecting the safety of the original structure. Furthermore, the contact surface between the newly poured concrete and the old concrete at the groove is relatively weak, making it more susceptible to damage under long-term water flow, thus leading to the failure of the waterproofing structure and affecting project safety. The latter method, while not causing significant damage to the old structure, relies on anchor bolts or similar methods to attach the waterproofing sealant to the joint. If the sealant on the joint surface ages and deteriorates over time, a weak point for seepage will form between the waterproofing sealant and the structural joint surface. This prevents the waterproofing sealant from providing secondary protection, impacting project safety and efficiency. Summary of the Invention

[0003] To solve the above problems, this utility model provides a simple, easy-to-implement, safe and reliable water-stopping structure for use between new and old concrete structures. Specifically, the following technical solution can be adopted:

[0004] The water-stopping structure for use between old and new concrete structures according to this utility model includes an old concrete structure, a new concrete structure, and a water-stopping plate disposed between the two; the old and new concrete structures are arranged side by side, and both the old and new concrete structures have a layer of reinforcing steel bars on their water-facing surfaces; an installation groove is provided on the side of the old concrete structure, the opening of the installation groove is opposite to the joint between the old and new structures, the installation groove is located below the layer of reinforcing steel bars, and the lower side wall of the installation groove is a planar structure that gradually slopes downward towards the joint between the old and new structures; the water-stopping nose of the water-stopping plate is disposed in the joint between the old and new structures, one side wing of the water-stopping plate is attached to and fixedly connected to the lower side wall, and the other side wing of the water-stopping plate is disposed in the new concrete structure; a cement mortar backfill layer is provided in the installation groove, and a sealant sealing layer is provided at the entrance of the joint between the old and new structures.

[0005] The joint between the old and new structures is perpendicular to the water-facing side.

[0006] The cross-section of the mounting groove is an isosceles right triangle with its base parallel to the seam between the old and new structures.

[0007] The waterstop is a 1.0mm thick copper waterstop.

[0008] The lower sidewall is provided with a lower gasket, a waterstop plate, an upper gasket, and a pressure plate in sequence. The lower gasket, waterstop plate, upper gasket, and pressure plate are connected to the old concrete structure by anchor bolts.

[0009] This utility model provides a water-stopping structure for the transition between new and old concrete structures. It employs a groove-cutting method on the side of the old concrete structure to avoid the load-bearing steel reinforcement layer on the water-facing side, thus avoiding the drawback of cutting off the reinforcement during grooving and preserving the original structure's structural strength. The waterstop is fixed at an angle within the side groove, and then backfilled with high-strength cement mortar. The junction of the backfill material and the side groove avoids the water-facing side, making it resistant to damage over long-term operation. This utility model features a simple structure, is easy to construct, is safe, reliable, stable, and durable, and provides excellent water-stopping performance, making it highly suitable for the reinforcement, upgrading, and renovation of water conservancy projects. Attached Figure Description

[0010] Figure 1 The installation intention of the existing waterstop plate Figure 1 .

[0011] Figure 2 yes Figure 1 A schematic diagram of the water stop plate.

[0012] Figure 3 The installation intention of the existing waterstop plate Figure 2 .

[0013] Figure 4 yes Figure 3A schematic diagram of the water stop plate.

[0014] Figure 5 This is a schematic diagram of the structure of this utility model (closed-cell foam board omitted).

[0015] Figure 6 yes Figure 5 A schematic diagram of the water stop plate.

[0016] Figure 7 yes Figure 5 A magnified view of the middle anchor bolt section. Detailed Implementation

[0017] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings. These embodiments are implemented based on the technical solution of this utility model and provide detailed implementation methods and specific operation processes. However, the protection scope of this utility model is not limited to the following embodiments.

[0018] like Figure 5-7 As shown, the water-stopping structure for the gap between old and new concrete structures according to this utility model includes an old concrete structure 1, a new concrete structure 2, and a water-stopping plate 3 disposed between the two.

[0019] The old concrete structure 1 and the new concrete structure 2 are arranged side by side. In this embodiment, the joint between the two (i.e., the joint 4 between the old and new structures) is perpendicular to the water-facing side. Both the old concrete structure 1 and the new concrete structure 2 are equipped with reinforcing bars and distribution bars (forming a reinforcement layer 5) on their water-facing sides according to the structural stress conditions to meet the safety requirements of the concrete structure.

[0020] An installation groove 6 is provided on the side of the old concrete structure 1 (i.e., the side near the joint 4 between the old and new structures). The installation groove 6 is located below the reinforcing steel layer 5. The opening of the installation groove 6 is opposite to the joint 4 between the old and new structures, and the lower sidewall of the installation groove 6 is a planar structure that gradually slopes downward towards the joint 4. In this embodiment, the cross-section of the installation groove 6 is an isosceles right triangle structure with its base parallel to the joint 4 between the old and new structures. That is, the upper sidewall of the installation groove 6 is inclined upward at 45° along its axis of symmetry, and the lower sidewall is inclined downward at 45° along its axis of symmetry. Therefore, when installing the waterstop 3, only one side of its flange needs to be folded upward at 45°, which is convenient and easy. Furthermore, when the flange of the waterstop 3 is attached to the lower sidewall, if water seepage occurs, it will converge along the flange towards the waterstop nose (i.e., the U-shaped bend in the middle of the waterstop 3), improving the water-blocking effect.

[0021] The aforementioned waterstop 3 is made of 1.0mm thick copper. Its central waterstop nose is positioned within the joint 4 between the new and old structures. One side flange is attached to and fixedly connected to the lower side wall of the mounting groove 6, while the other side flange is poured into the new concrete structure 2 during construction. Closed-cell foam boards are installed within the joint 4 between the new and old structures to separate the concrete.

[0022] The aforementioned waterstop 3 is connected to the old concrete structure 1 by anchoring. Specifically, a lower gasket 7 is installed above the lower side wall of the installation groove 6, followed by the waterstop 3, upper gasket 8, and pressure plate 9, which are then placed sequentially. Anchor bolts 10 are then used to fix the lower gasket 7, waterstop 3, upper gasket 8, and pressure plate 9 to the old concrete structure 1. The upper gasket 8 and lower gasket 7 are typically rubber gaskets, the pressure plate 9 is made of Q235 steel, and multiple anchor bolts 10 are evenly spaced along the length of the installation groove 6.

[0023] After the new concrete structure 2 is completed, high-grade cement mortar (with a strength higher than that of the old concrete structure 1) is injected into the installation groove 6 through the grouting pipe to form a cement mortar backfill layer 11, and sealant is filled at the entrance of the joint 4 between the new and old structures to form a sealant sealing layer 12.

[0024] It should be noted that in the description of this utility model, terms such as "front", "rear", "left", "right", "vertical", "horizontal", "inner", and "outer" indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A water-stopping structure for use between new and old concrete structures, characterized in that: The system includes an old concrete structure, a new concrete structure, and a waterstop plate positioned between them. The old and new concrete structures are arranged side by side, with reinforcing steel layers on their water-facing surfaces. An installation groove is provided on the side of the old concrete structure, with its opening opposite the joint between the old and new structures. The installation groove is located below the reinforcing steel layers, and its lower sidewall is a planar structure that gradually slopes downwards towards the joint. The waterstop plate's waterstop nose is positioned within the joint between the old and new structures. One side of the waterstop plate is attached to and fixedly connected to the lower sidewall, while the other side of the waterstop plate is positioned within the new concrete structure. A cement mortar backfill layer is provided within the installation groove, and a sealant sealing layer is provided at the entrance of the joint between the old and new structures.

2. The water-stopping structure for the gap between new and old concrete structures according to claim 1, characterized in that: The joint between the old and new structures is perpendicular to the water-facing side.

3. The water-stopping structure for the gap between new and old concrete structures according to claim 1, characterized in that: The cross-section of the mounting groove is an isosceles right triangle with its base parallel to the seam between the old and new structures.

4. The water-stopping structure for the gap between new and old concrete structures according to claim 1, characterized in that: The waterstop is a 1.0mm thick copper waterstop.

5. The water-stopping structure for the gap between new and old concrete structures according to claim 1, characterized in that: The lower sidewall is provided with a lower gasket, a waterstop plate, an upper gasket, and a pressure plate in sequence. The lower gasket, waterstop plate, upper gasket, and pressure plate are connected to the old concrete structure by anchor bolts.

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