Self-waterproofing outer wall construction joint waterproof structure

Abstract

The utility model relates to the technical field of outer wall waterproof structure, more specifically, relate to a kind of self-waterproof outer wall construction joint waterproof structure.The utility model forms the inclined tongue-and-groove construction joint by inclined formwork, the concave side of water stop steel plate is towards water-facing surface, water-swelling water stop strip is installed at section dark angle, recess is set in water-facing surface interface and fills waterproof expansion mortar, multi-angle omnidirectionally solves the leakage problem of new and old concrete connecting part of side wall, effectively controls construction joint water seepage hidden danger.The utility model adopts four waterproof barriers, avoids seepage, effectively guarantees waterproof effect, and simultaneously forms the inclined tongue-and-groove construction joint by inclined formwork, prolongs the length of water seepage channel, further reduces the risk of seepage.

Description

Technical Field

[0001] This utility model relates to the field of exterior wall waterproofing construction technology, and more specifically, to a self-waterproof exterior wall construction joint waterproofing structure. Background Technology

[0002] In waterproofing projects, leakage at construction joints in side walls is one of the most common and difficult problems to manage. Many factors affect the quality of construction joints, but the phased pouring of side walls inevitably makes the connection between new and old concrete a highly susceptible area for leakage. To solve this type of leakage problem, it is necessary to propose a self-waterproofing structure for exterior wall construction joints. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the prior art by providing a self-waterproofing structure for exterior wall construction joints. It utilizes a slanted template to create an inclined tongue-and-groove construction joint, with the concave side of the water-stop steel plate facing the water-facing side. A water-swellable water-stop strip is installed at the internal corner of the cross-section, and a groove is created at the water-facing interface and filled with waterproof expanding mortar. This multi-angle, comprehensive approach solves the leakage problem at the connection between new and old concrete in the side wall, effectively controlling the potential for water seepage at the construction joint. This invention employs the aforementioned four waterproof barriers to prevent water leakage and effectively ensure waterproofing. Simultaneously, the inclined template creates an inclined tongue-and-groove construction joint, extending the seepage channel length and further reducing the risk of leakage.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A self-waterproof exterior wall construction joint waterproofing structure includes pre-cast concrete and post-cast concrete forming the self-waterproof exterior wall, and a water-stop steel plate installed on the top of the exterior wall guide wall. The concave side of the water-stop steel plate faces the water-facing side. An inclined template is set between the pre-cast concrete and the post-cast concrete to form an inclined tongue-and-groove construction joint. The inclined tongue-and-groove construction joint formed by the inclined template forms a non-vertical joint surface, eliminating the stress concentration phenomenon of traditional right-angle construction joints. At the same time, compared with flat joints, the inclined cross-section extends the seepage path by more than 40%, significantly increasing the water flow seepage resistance.

[0006] A water-swellable sealing strip is installed at the inside corner of the cross section facing the water-facing side of the tongue-and-groove construction joint. By setting the water-swellable sealing strip in the stress concentration area, the expanded body of the strip can be embedded with the concrete interface after expansion, fully filling the micro-cracks. At the same time, the water-swellable sealing strip automatically seals the small-scale cracks caused by concrete shrinkage.

[0007] The tongue-and-groove construction joint has a groove at the water-facing interface, which is filled with waterproof expansion mortar. The groove provides a curing space, making the mortar anchoring strength higher than the tensile strength of the concrete, and dynamically compensating for structural deformation through the expansion effect.

[0008] Furthermore, the tongue-and-groove construction joint includes a water-facing end near the water-facing side and a water-returning end near the water-returning side. The water-facing end is parallel to the water-returning end, and the height of the water-facing end is lower than that of the water-returning end. The water-facing end and the water-returning end are connected by an inclined surface. The inclined surface design eliminates right-angled internal corners, reducing stress concentration and the risk of cracking. The inclined cross-section extends the seepage path and improves the self-waterproofing ability. The water-stop steel plate is installed vertically on the water-returning end to avoid displacement of the steel plate due to the weakness of the inclined surface.

[0009] Furthermore, the length of the backwater end is not less than twice the length of the frontwater end. By increasing the interlocking area of ​​the concrete on the backwater side of the wall, the shear resistance is improved and joint misalignment is prevented. The vertical inclination angle of the slope is 55°-65°, which improves the air bubble discharge efficiency in the slope area and ensures a balance between the shear strength of the interlocking teeth and the feasibility of construction.

[0010] Furthermore, the vertical inclination angle of the inclined plane is 60°.

[0011] Furthermore, it also includes a raft foundation, on which the pre-cast concrete is located.

[0012] Furthermore, the length ratio of the water-facing end, the inclined surface, and the back water-facing end is 1:2.5:2; the width and height ratio of the water-swellable sealing strip is 2:5, and the high strip ratio ensures that the radial pressure effectively seals the inside corner after expansion.

[0013] Furthermore, the width of the water-stop steel plate is 270-350mm and the thickness is 2.5-4mm.

[0014] Furthermore, the width of the water-stop steel plate is greater than the length of the back water end.

[0015] Furthermore, the width and thickness of the water-stop steel plate are 300mm and 3mm respectively, and the width and height of the water-swellable water-stop strip are 20mm and 50mm respectively.

[0016] Furthermore, the groove is a strip-shaped groove with a width-to-depth ratio of 4:1, which provides sufficient space for expansion and deformation, avoids cracking, and ensures the anchoring force of the mortar; the waterproof expansion mortar is flush with the surface of the pre-poured concrete and the post-poured concrete.

[0017] Furthermore, the width and depth of the groove are 100mm and 25mm, respectively.

[0018] Furthermore, the surface of the tongue-and-groove construction joint is covered with a waterproof coating layer, and the expansion sealing strip is installed in conjunction with the waterproof coating layer.

[0019] Furthermore, the waterproof coating layer is a cement-based penetrating crystalline coating, and the ratio of the thickness of the waterproof coating layer to the width of the groove is 0.65-1:50.

[0020] Furthermore, the thickness of the waterproof coating layer is 1.5 mm.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] (1) This utility model has good waterproof effect and can greatly reduce leakage at the connection between new and old concrete in the construction joint of the side wall; even if leakage occurs, the waterproof coating layer at the connection can repair the leakage channel itself, and the water-swelling waterstop strip can also seal the seepage channel.

[0023] (2) This utility model forms an inclined tongue and groove construction joint by using an inclined template, which eliminates the stress concentration phenomenon of right-angle construction joints, extends the seepage path, and significantly increases the resistance to water flow. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of the connection between new and old concrete in the side wall construction joint of this utility model;

[0025] Figure 2 This is an enlarged view of a partial structure of the present invention.

[0026] In the diagram: 1. First concrete pouring; 2. Second concrete pouring; 3. Tongue-and-groove construction joint; 4. Water-stop steel plate; 5. Water-stop strip; 6. Groove; 7. Raft foundation; 8. Waterproof expansion mortar; 9. Waterproof coating layer. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship 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.

[0029] Example 1:

[0030] Please see Figure 1-2A self-waterproof exterior wall construction joint waterproofing structure includes pre-cast concrete 1 and post-cast concrete 2 forming a self-waterproof exterior wall, and a water-stop steel plate 4 installed on the top of the exterior wall guide wall. The width of the water-stop steel plate 4 is 270-350mm and the thickness is 2.5-4mm. The concave side of the water-stop steel plate 4 faces the water-facing side of the wall. An inclined tongue-and-groove construction joint 3 with an inclined cross-section is formed between the pre-cast concrete 1 and the post-cast concrete 2 by setting an inclined template. The inclined tongue-and-groove construction joint 3 formed by the inclined template serves as a non-vertical joint surface, eliminating the stress concentration phenomenon of right-angle construction joints. At the same time, compared with flat joints, the inclined cross-section of the tongue-and-groove construction joint 3 extends the seepage path by more than 40%, significantly increasing the resistance to water flow seepage.

[0031] Water-swellable sealing strip 5 is installed at the inside corner of the cross section facing the water-facing side of the tongue and groove construction joint 3. Water-swellable sealing strip 5 is also installed in the high-risk area of ​​stress concentration and seepage. The width-to-height ratio of the water-swellable sealing strip 5 is 2:5. The high strip ratio ensures that the radial pressure after expansion effectively seals the inside corner, so that the expanded water-swellable sealing strip 5 forms an interlock with the concrete interface, fully filling the micro-cracks. At the same time, the water-swellable sealing strip 5 automatically seals the small-scale cracks caused by concrete shrinkage.

[0032] A groove 6 is provided at the water-facing interface of the tongue-and-groove construction joint 3. The groove 6 is a strip-shaped groove with a width-to-depth ratio of 4:1. The groove 6 is filled with waterproof expansion mortar 8. The waterproof expansion mortar 8 is flush with the surface of the first-poured concrete 1 and the second-poured concrete 2. The expansion effect dynamically compensates for structural deformation and prevents water seepage at the interface.

[0033] The tongue-and-groove construction joint 3 includes a water-facing end near the water-facing side of the wall and a water-returning end near the water-returning side. The water-facing end of the tongue-and-groove construction joint 3 is parallel to the water-returning end, and the height of the water-facing end is lower than that of the water-returning end. The water-facing end and the water-returning end of the tongue-and-groove construction joint 3 are connected by an inclined slope with a vertical inclination angle of 55°-65°. The ratio of the length of the water-facing end, the inclined slope, and the water-returning end is 1:2.5:2, thereby extending the seepage path. Compared with the right-angled inside corner used in the prior art, this utility model optimizes the vibration energy transmission route, improves the air bubble discharge rate, and avoids defects such as honeycomb and holes caused by insufficient vibration, which affect the strength and waterproofness, while reducing stress concentration and crack risk.

[0034] The water-stop steel plate 4 is vertically installed on the back water end of the tongue and groove construction joint 3. The width of the water-stop steel plate 4 is greater than the length of the back water end, and the inclined surface has a corresponding tilt angle, thereby balancing the shear strength of the interlocking teeth and the feasibility of construction. Furthermore, by anchoring the water-stop steel plate 4 to a thicker, high-strength area, the waterproof strength of the water-stop steel plate 4 is enhanced.

[0035] The surface of the tongue and groove construction joint 3 is covered with a cement-based penetrating and crystalline waterproof coating layer 9. The ratio of the thickness of the waterproof coating layer 9 to the width of the groove 6 is 0.65-1:50. While forming a sealing barrier on the surface, the penetration cracks self-repair.

[0036] Example 2:

[0037] Please see Figure 1-2 According to Embodiment 1, the self-waterproof exterior wall construction joint waterproofing structure also includes a raft foundation 7.

[0038] Erect and fix the 300mm wide and 3mm thick waterstop steel plate 4 at the designed position of the guide wall. Pour the pre-cast concrete 1 on the raft foundation 7. At the same time, set the inclined template on the water-facing side of the waterstop steel plate 4 to form the tongue and groove construction joint 3. The vertical inclination angle of the inclined surface of the tongue and groove construction joint 3 is 60°. Roughen the tongue and groove construction joint 3. The waterstop steel plate 4 is perpendicular to the back water end of the tongue and groove construction joint 3. Install the 20mm wide and 50mm high water-swellable waterstop strip 5 at the inside corner of the water-facing end of the tongue and groove construction joint 3.

[0039] Before the side wall is closed, a 1.5mm thick cement-based penetrating crystalline waterproof coating layer 9 is applied to the surface of the tongue and groove construction joint 3 and then watered for 72 hours.

[0040] A groove 6, 100mm wide and 25mm deep, is set on the water-facing surface of the first concrete 1 and the subsequent concrete 2. Waterproof expansion mortar 8 is prepared by mixing cement, expansion agent, sand and water in a ratio of 0.9:0.1:1:0.3 and filling the groove 6 with waterproof expansion mortar 8.

Claims

1. A self-waterproofing structure for waterproofing construction joints in exterior walls, characterized in that: It includes pre-cast concrete (1) and post-cast concrete (2) forming a self-waterproof exterior wall, and a water-stop steel plate (4) installed on the top of the guide wall of the exterior wall, with the concave side of the water-facing side facing the water-facing side; the pre-cast concrete (1) and the post-cast concrete (2) are connected by setting an inclined template to form a tongue-and-groove construction joint (3) with an inclined cross section, and a water-swellable water-stop strip (5) is installed at the inside corner of the cross section facing the water-facing side of the tongue-and-groove construction joint (3), and a groove (6) is provided at the interface of the water-facing side of the tongue-and-groove construction joint (3), and the groove (6) is filled with waterproof expansion mortar (8).

2. The self-waterproofing exterior wall construction joint waterproofing structure according to claim 1, characterized in that: The tongue and groove construction joint (3) includes a water-facing end near the water-facing side and a water-returning end near the water-returning side. The water-facing end is parallel to the water-returning end, and the height of the water-facing end is lower than that of the water-returning end. The water-facing end and the water-returning end are connected by the inclined surface. The water-stop steel plate (4) is vertically installed on the water-returning end.

3. The self-waterproofing exterior wall construction joint waterproofing structure according to claim 2, characterized in that: The length of the backwater end is not less than twice the length of the frontwater end, and the vertical inclination angle of the inclined plane is 60°.

4. The self-waterproofing exterior wall construction joint waterproofing structure according to claim 1, characterized in that: It also includes a raft foundation (7), on which the pre-cast concrete (1) is located.

5. The self-waterproofing exterior wall construction joint waterproofing structure according to claim 3, characterized in that: The length ratio of the water-facing end, the inclined surface, and the back water-facing end is 1:2.5:2; the width and height ratio of the water-swellable sealing strip (5) is 2:

5.

6. The self-waterproofing exterior wall construction joint waterproofing structure according to claim 5, characterized in that: The width of the water-stop steel plate (4) is greater than the length of the back water end.

7. The self-waterproofing exterior wall construction joint waterproofing structure according to claim 1, characterized in that: The groove (6) is a strip groove with a width-to-depth ratio of 4:1; the waterproof expansion mortar (8) is flush with the surfaces of the pre-cast concrete (1) and the post-cast concrete (2).

8. The self-waterproofing exterior wall construction joint waterproofing structure according to claim 1, characterized in that: The surface of the tongue and groove construction joint (3) is covered with a waterproof coating layer (9), and the expansion sealing strip (5) is installed in conjunction with the waterproof coating layer (9).

9. A self-waterproofing exterior wall construction joint waterproofing structure according to claim 8, characterized in that: The waterproof coating layer (9) is a cement-based penetrating crystallizing coating, and the ratio of the thickness of the waterproof coating layer (9) to the width of the groove (6) is 0.65-1:50.

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