A shear resistant sheathing structure for architectural movement joints

Abstract

This utility model discloses a shear sheath structure for building expansion joints, including a pre-cast concrete body, a post-cast concrete body, and an expansion joint reserved between them. It also includes a shear force transmission unit and a flexible sealing unit. The shear force transmission unit includes multiple horizontally arranged parallel reinforcing bars. The flexible sealing unit includes a sleeve and a first flexible sealing material filled inside it. One end of the reinforcing bar is pre-embedded in the pre-cast concrete body, and the other end passes through the expansion joint and is fitted into the sleeve, and is also pre-embedded in the post-cast concrete body along with the sleeve. The expansion joint is tightly filled with a second flexible sealing material. This utility model integrates shear resistance and sealing functions, effectively transmitting shear force. The first flexible sealing material forms a first flexible sealing layer between the sleeve and the reinforcing bars, adapting to minor deformations. The second flexible sealing material fills the interior of the expansion joint, effectively preventing moisture and impurities from entering the structure and protecting the reinforcing bars from corrosion.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, and in particular to a shear sheath structure for building expansion joints. Background Technology

[0002] In large concrete structures, the installation of expansion joints is crucial. Their function is to release temperature stress and accommodate uneven settlement, thereby ensuring the safety and stability of the building structure. However, traditional expansion joint designs have many problems. Traditional expansion joint designs often focus on waterproofing and sealing, with insufficient consideration for shear resistance. Under complex conditions such as earthquakes or lateral loads, the structures on both sides of the joint are prone to harmful relative displacement. This displacement can compromise the structural integrity, reduce the load-bearing capacity, and thus affect the building's safety. In severe cases, it can even lead to structural damage or collapse, posing a significant threat to people's lives and property. In existing technologies, shear-resistant components and sealing components are usually installed separately. This separate installation method brings many drawbacks. From a construction perspective, the shear-resistant components and sealing components need to be installed separately, making the construction process complex, increasing construction difficulty and time. Moreover, the coordination between the components is poor, making it difficult to form an organic whole and fully utilize their respective advantages, resulting in poor overall performance. Furthermore, due to the insufficient tightness of the connections and fits between the components, they are easily affected by environmental factors such as temperature changes, humidity changes, and chemical corrosion during long-term use, which reduces the durability of the components and affects the service life of the expansion joint. Utility Model Content

[0003] In view of the problems existing in the prior art, the present invention aims to provide a shear shear structure for building expansion joints that can effectively transmit shear force, adapt to deformation and have reliable sealing performance, so as to solve the shortcomings of traditional expansion joint structures in terms of shear resistance, sealing and durability.

[0004] To achieve the above objectives, this utility model proposes a shear sheath structure for building expansion joints, comprising a pre-cast concrete body, a post-cast concrete body, and an expansion joint reserved between the two, and further comprising a shear force transmission unit and a flexible sealing unit. The shear force transmission unit comprises multiple horizontally arranged steel bars, and the flexible sealing unit comprises a sleeve and a first flexible sealing material filled inside it. One end of the steel bar is pre-embedded in the pre-cast concrete body, and the other end passes through the expansion joint and is sleeved in the sleeve, and is pre-embedded in the post-cast concrete body together with the sleeve. The expansion joint is tightly filled with a second flexible sealing material.

[0005] In the above scheme: the diameter of the reinforcing bar is 20~32mm, and the spacing between two adjacent reinforcing bars is 15~25cm, so as to ensure that the reinforcing bars can effectively transmit shear force.

[0006] In the above scheme: the sleeve is a metal sleeve with an inner diameter of 25~35mm and a length of 300~340mm; the first flexible sealing material is an asphalt-based sealant or synthetic polymer sealant with elasticity and adhesion. This material can fill the gap between the reinforcing bar and the sleeve, preventing moisture and impurities from entering, while also having a certain degree of elasticity to adapt to the deformation of the expansion joint and ensure the sealing effect.

[0007] In the above scheme: the sleeve is a cast iron pipe or steel pipe with an inner diameter of 30mm and a length of 310mm; the diameter of the reinforcing bar is 28mm; the spacing between two adjacent reinforcing bars is 20cm; the cast iron pipe or steel pipe has good strength and a long service life.

[0008] In the above scheme: the anchorage length of the reinforcing bar within the first concrete pour is not less than 290mm to ensure sufficient connection strength between the reinforcing bar and the first concrete pour, effectively transmitting shear force. The length extending into the subsequent concrete pour is not greater than 270mm, and the width of the expansion joint is 20~40mm, ensuring the stability of the reinforcing bar in the subsequent concrete pour while providing sufficient space for deformation of the expansion joint.

[0009] In the above scheme: the second flexible sealing material is polysulfide caulking compound, which can tightly wrap the exposed section of the steel bar, fill all gaps, form a continuous and integral second sealing body, and has excellent deformation adaptability.

[0010] The beneficial effects of this utility model are:

[0011] 1. By using multiple reinforcing bars as shear transfer units, shear force can be effectively transferred, enhancing the overall integrity of the structure on both sides of the expansion joint, preventing harmful relative displacement under earthquakes or lateral loads, and improving structural safety. 2. A dual-sealing system is formed by combining a first flexible sealing material and a second flexible sealing material. The first flexible sealing material fills the gap between the reinforcing bars and the sleeve, acting as an isolation layer during post-concrete pouring to prevent concrete slurry from intruding into critical areas of the reinforcing bars and protecting them from corrosion. The second flexible sealing material fills the interior of the expansion joint, effectively preventing moisture and impurities from entering the structure, protecting the reinforcing bars from corrosion, and extending the service life of the structure. 3. The flexible sealing unit forms the first flexible sealing layer between the sleeve and the reinforcing bars, which can adapt to minor deformations. Under conditions of temperature changes and uneven settlement, the expansion joint will deform to a certain extent. The design of adding flexible sealing units allows this deformation to occur while ensuring shear resistance, avoiding structural damage caused by rigid connections. 4. This structure integrates shear resistance and sealing functions, eliminating the need to install shear force transmission units and flexible sealing units separately during construction. The assembly of steel bars and flexible sealing units can be completed in the factory in advance, effectively simplifying the construction process, improving construction efficiency, and reducing construction costs. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0013] like Figure 1 As shown, a shear sheath structure for building expansion joints mainly consists of a shear force transmission unit, a flexible sealing unit, a pre-cast concrete body 1, a post-cast concrete body 2, and an expansion joint 3 reserved between the pre-cast concrete body 1 and the post-cast concrete body.

[0014] The shear-transmitting unit includes multiple transversely arranged steel bars 4, and the flexible sealing unit includes a sleeve 5 and a first flexible sealing material 6 filled inside it. One end of the steel bar 4 is pre-embedded in the first concrete pouring 1, and the other end passes through the expansion joint 3 and is then fitted into the sleeve 5, and is pre-embedded together with the sleeve 5 in the subsequent concrete pouring 2. The expansion joint 3 is tightly filled with a second flexible sealing material 7.

[0015] Ideally, the diameter of the reinforcing bar 4 should be 20~32mm, and the spacing between two adjacent reinforcing bars 4 should be 15~25cm to ensure that the reinforcing bar 4 can effectively transmit shear force.

[0016] Ideally, the sleeve 5 should be a metal sleeve with an inner diameter of 25-35 mm and a length of 300-340 mm, and the first flexible sealing material 6 should be an elastic and adhesive asphalt-based sealant or a synthetic polymer sealant. This material can fill the gap between the reinforcing bar 4 and the sleeve 5, preventing moisture and impurities from entering, while also having a certain degree of elasticity to adapt to the deformation of the expansion joint 3 and ensure a sealing effect.

[0017] Ideally, the sleeve 5 should be a cast iron or steel pipe with an inner diameter of 30mm and a length of 310mm, the reinforcing bar 4 should have a diameter of 28mm, and the spacing between two adjacent reinforcing bars 4 should be 20cm. Cast iron or steel pipes have good strength and a long service life.

[0018] Ideally, the anchorage length of the reinforcing bar 4 within the first concrete pour 1 should be no less than 290mm to ensure sufficient connection strength between the reinforcing bar 4 and the first concrete pour 1, effectively transferring shear force. The length extending into the subsequent concrete pour 2 should not exceed 270mm, and the width of the expansion joint 3 should be 20~40mm. This ensures the stability of the reinforcing bar 4 within the subsequent concrete pour 2 while also providing sufficient space for deformation of the expansion joint 3.

[0019] Ideally, the second flexible sealing material 7 is polysulfide caulking compound, which can tightly wrap the exposed section of the reinforcing bar 4, fill all gaps, form a continuous and integral second sealing body, and has excellent deformation adaptability.

Claims

1. A shear sheath structure for building expansion joints, comprising a pre-cast concrete body (1), a post-cast concrete body (2), and an expansion joint (3) reserved between the two, characterized in that: It also includes a shear force transmission unit and a flexible sealing unit. The shear force transmission unit includes multiple horizontally arranged steel bars (4). The flexible sealing unit includes a sleeve (5) and a first flexible sealing material (6) filled inside it. One end of the steel bar (4) is pre-embedded in the first concrete pouring body (1), and the other end passes through the deformation joint (3) and is then sleeved in the sleeve (5). It is also pre-embedded in the second concrete pouring body (2) together with the sleeve (5). The deformation joint (3) is tightly filled with a second flexible sealing material (7).

2. The shear sheath structure for building expansion joints according to claim 1, characterized in that: The diameter of the steel bar (4) is 20~32mm, and the spacing between two adjacent steel bars (4) is 15~25cm.

3. The shear shear structure for building expansion joints according to claim 2, characterized in that: The sleeve (5) is a metal sleeve with an inner diameter of 25~35mm and a length of 300~340mm. The first flexible sealing material (6) is an asphalt-based grease or a synthetic polymer sealant with elasticity and adhesion.

4. The shear sheath structure for building expansion joints according to claim 3, characterized in that: The sleeve (5) is a cast iron pipe or steel pipe with an inner diameter of 30 mm and a length of 310 mm. The diameter of the reinforcing bar (4) is 28 mm, and the spacing between two adjacent reinforcing bars (4) is 20 cm.

5. The shear sheath structure for building expansion joints according to claim 4, characterized in that: The anchorage length of the steel bar (4) in the first concrete pouring body (1) is not less than 290mm, and the length extending into the second concrete pouring body (2) is not greater than 270mm. The width of the expansion joint (3) is 20~40mm.

6. The shear sheath structure for building expansion joints according to claim 1, characterized in that: The second flexible sealing material (7) is polysulfide caulking compound.

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