Waterproof structure at interface between new and old foundation slabs

Abstract

The utility model discloses a new and old foundation bottom plate junction position waterproof structure, including old concrete, polymer cement waterproof mortar, new concrete, the old concrete is formed step structure through breaking treatment, and the step structure corner is provided with first water baffle, and the old concrete left side surface is provided with second water baffle, the polymer cement waterproof mortar is brushed on step structure surface, the polymer cement waterproof mortar upper surface is provided with water stop steel sheet, and the new concrete is poured and is spliced with old concrete, and the new concrete is also step structure, and the new concrete and old concrete sandwich first water baffle, second water baffle, water stop steel sheet, form three waterproof structures, for the seepage phenomenon of new and old concrete junction position, prevent groundwater from infiltrating building structure inside through setting waterproof measure, be applicable to the connection of foundation bottom plate, basement outer wall, basement roof position, simple structure, convenient construction.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, specifically a waterproof structure at the junction of old and new foundation slabs. Background Technology

[0002] With the accelerated pace of building renovation and upgrades, an increasing number of foundations are undergoing modification and reinforcement. During the process of modifying and reinforcing the foundation slab, leakage problems are frequently encountered, causing significant inconvenience to the normal use of the building. How to effectively eliminate the risk of water seepage from the foundation slab and prevent groundwater from seeping into the building structure has become a difficult problem to solve. Among related technologies, sealing joints with quick-setting cement through grouting has long-term durability that is greatly affected by the environment (such as ultraviolet rays and acid / alkali corrosion), resulting in insufficient waterproofing period. Another method involves covering the gaps with asphalt, but the bond between the asphalt and concrete is not strong enough, and leakage problems easily recur after a period of use. These methods are passive repairs that do not address the fundamental structural issues, making leakage problems prone to recurrence. Utility Model Content

[0003] The purpose of this utility model is to provide a waterproof structure at the junction of the old and new foundation slabs to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a waterproof structure at the junction of a new and an old foundation slab, comprising old concrete, wherein the old concrete is demolished to form a stepped structure, a first water-blocking strip is provided at the corner of the stepped structure, and a second water-blocking strip is provided on the left side of the old concrete. Polymer cement waterproof mortar, wherein the polymer cement waterproof mortar is applied to the surface of the stepped structure, and a water-stop steel plate is provided on the upper surface of the polymer cement waterproof mortar; The new concrete is poured and combined with the old concrete. The new concrete also has a stepped structure, which increases the bonding area between the new and old concrete, significantly improving the shear resistance and integrity of the interface. The new concrete and the old concrete sandwich the first water-blocking strip, the second water-blocking strip, and the water-stop steel plate, forming multiple three-dimensional defense lines, effectively extending the seepage path and greatly improving the reliability of waterproofing.

[0005] Furthermore, several grooves are provided at the contact position between the polymer cement waterproof mortar and the old concrete. The polymer cement waterproof mortar levels the grooves to maintain the flatness of the water-stop steel plate. As a transition layer between the new and old concrete, it has good adhesion and waterproof performance, further blocking the tiny gaps at the interface.

[0006] Furthermore, the first and second water-blocking strips are water-swellable water-stop strips that actively compress and seal gaps. Their water-stopping effect increases with water pressure, making them particularly suitable for dealing with new gaps caused by structural deformation.

[0007] Furthermore, the water-stop steel plate is inclined upwards on both the left and right sides, which further extends the seepage path and enhances the water-stopping effect of the steel plate.

[0008] Furthermore, the old concrete is roughened through a stepped structure and coated with an interface agent. The new concrete and the old concrete are connected by structural steel reinforcement bars to share the load, effectively resisting the tensile stress caused by uneven settlement and temperature changes, and protecting the stability of the waterproof structure.

[0009] Compared with the prior art, the beneficial effects of this utility model are: by forming a three-layer waterproof structure through the first water-blocking strip, the second water-blocking strip, and the water-stopping steel plate, it addresses the water seepage phenomenon that occurs at the junction of new and old concrete. By setting up multiple waterproof measures, it prevents groundwater from seeping into the interior of the building structure. It is suitable for the connection of foundation slabs, basement exterior walls, basement roof slabs, etc. It has a simple structure, is convenient to construct, has low construction difficulty, and high reliability. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of the present invention.

[0011] In the diagram: 1. New concrete; 2. Old concrete; 3. Water-stop steel plate; 4. First water-blocking strip; 5. Second water-blocking strip; 6. Polymer cement waterproof mortar. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0013] Please see Figure 1 This utility model provides a technical solution: a waterproof structure at the junction of a new and old foundation slab, which is composed of new concrete 1, old concrete 2, water-stop steel plate 3, a first water-swellable water-stop strip, a second water-swellable water-stop strip, and polymer cement waterproof mortar 6.

[0014] The old concrete 2 is demolished to form a stepped structure. A first water-blocking strip 4 is installed at the corner of the stepped structure, and a second water-blocking strip 5 is installed on the left side of the old concrete 2. This forms two waterproof structures in different positions, which can effectively block the infiltration of water from different directions. The polymer cement waterproof mortar 6 is applied to the surface of the stepped structure. A water-stop steel plate 3 is set on the upper surface of the polymer cement waterproof mortar 6. The polymer cement waterproof mortar 6 and the water-stop steel plate 3 form a water-stopping and waterproof structure between the first water-stopping strip 4 and the second water-stopping strip 5. Three waterproof measures are arranged on possible seepage channels to prevent new seepage. The new concrete 1 and the old concrete 2 are poured and assembled together. The new concrete 1 also has a stepped structure. The new concrete 1 and the old concrete 2 sandwich the first water-blocking strip 4, the second water-blocking strip 5, and the water-stop steel plate 3, so that the new concrete 1 and the old concrete 2 are neatly assembled. At the same time, the waterproof structure is not visible from the outside, which improves the aesthetics of the splicing of the new concrete 1 and the old concrete 2.

[0015] In this embodiment, as Figure 1 As shown, several grooves are provided at the contact position between the polymer cement waterproof mortar 6 and the old concrete 2. The polymer cement waterproof mortar 6 levels the grooves to maintain the flat state of the water-stop steel plate 3. The polymer cement waterproof mortar 6, together with the grooves, can form a tortuous structure, which enhances the ability to block water penetration. Leveling the water-stop steel plate 3 also improves the stability of the splicing between the new concrete 1 and the old concrete 2.

[0016] In this embodiment, as Figure 1 As shown, the first water-blocking strip 4 and the second water-blocking strip 5 are water-swellable water-stop strips. The water-swellable water-stop strips expand when soaked by the infiltrated water, filling the gap between the new concrete 1 and the old concrete 2, which can prevent water from continuing to seep in, and the water-blocking effect is stable.

[0017] In this embodiment, as Figure 1 As shown, the left and right sides of the waterstop steel plate 3 are inclined upwards, making it convenient to transport and lay the waterstop steel plate 3. The polymer cement waterproof mortar 6 can be bonded to the waterstop steel plate 3, which has a large resistance to water seepage and is easy to construct.

[0018] In this embodiment, as Figure 1 As shown, the old concrete 2 is roughened by breaking the stepped structure and coated with an interface agent, which improves the bond strength between the new concrete 1 and the old concrete 2 and reduces the risk of interface cracking and leakage. The new concrete 1 and the old concrete 2 are connected by structural steel reinforcement to form a whole and improve the connection strength.

[0019] Specifically, during the reinforcement and renovation of existing old concrete 2, the old concrete 2 is broken up in a stepped manner to form a stepped interface. A first expansion waterstop strip is placed near the water-contact surface of the interface, and polymer cement waterproof mortar 6 is applied to the corners of the stepped interface for leveling. A waterstop steel plate 3 is then laid in a basin-like manner, and a second water-swellable waterstop strip is placed at the inner corner. After completing the above work, new concrete 1 is poured.

[0020] To address water seepage at the interface between new and old concrete, multiple waterproofing measures are implemented to prevent groundwater from penetrating the building structure. The concrete used should be impermeable concrete as required by waterproofing technical specifications. The treatment of the interface between new and old concrete should comply with relevant specifications, including roughening the surface, applying an interface agent, and connecting it with structural steel reinforcement.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waterproof structure at the junction of old and new foundation slabs, characterized in that, include: Old concrete (2), the old concrete (2) is demolished to form a stepped structure, a first water-blocking strip (4) is set at the corner of the stepped structure, and a second water-blocking strip (5) is set on the left side of the old concrete (2); Polymer cement waterproof mortar (6) is applied to the surface of the stepped structure, and a water-stop steel plate (3) is provided on the upper surface of the polymer cement waterproof mortar (6). New concrete (1), which is poured and assembled with old concrete (2), and the new concrete (1) is also a stepped structure. The new concrete (1) and the old concrete (2) sandwich the first water-blocking strip (4), the second water-blocking strip (5), and the water-stop steel plate (3).

2. The waterproof structure at the junction of old and new foundation slabs according to claim 1, characterized in that: Several grooves are provided at the contact position between the polymer cement waterproof mortar (6) and the old concrete (2). The polymer cement waterproof mortar (6) levels the grooves to maintain the flat state of the water-stop steel plate (3).

3. The waterproof structure at the junction of old and new foundation slabs according to claim 1, characterized in that: The first water-blocking strip (4) and the second water-blocking strip (5) are water-swellable water-stop strips.

4. The waterproof structure at the junction of old and new foundation slabs according to claim 1, characterized in that: The water-stop steel plate (3) is inclined upward on both the left and right sides.

5. A waterproof structure at the junction of old and new foundation slabs according to claim 1, characterized in that: The old concrete (2) is roughened by breaking the stepped structure and coated with an interface agent. The new concrete (1) and the old concrete (2) are connected by structural steel reinforcement.

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