Waterproofing structure for the first-floor expansion joint between old and new buildings in renovation and expansion projects.

Abstract

This utility model provides a waterproof structure for the first-floor expansion joint between old and new buildings in a renovated or expanded building, belonging to the field of building waterproofing technology. It includes the first-floor slab of the retained building with a basement and the first-floor slab of the newly constructed building, with a first-floor expansion joint formed between them. By pouring reinforced concrete walls (No. 1 and No. 2) downwards on the underside of the first-floor slabs of the retained and newly constructed buildings on both sides of the first-floor expansion joint, a cavity is formed in the civil engineering structure. This prevents the first-floor slab from directly contacting the foundation layer, underground soil, and backfill. When a small amount of water seepage occurs, the water will seep into the cavity instead of into the first-floor expansion joint. This effectively utilizes the reinforced concrete cavity to achieve waterproofing, preventing ground damage and affecting the building's functionality due to leakage at the first-floor expansion joint, thus ensuring the normal use and structural safety of the building.

Description

Technical Field

[0001] This utility model belongs to the field of building waterproofing construction technology, and relates to a waterproofing structure for the first-floor expansion joint between new and old buildings in renovation and expansion projects. Background Technology

[0002] In the context of urban renewal, with an increasing number of preservation, renovation, and expansion projects, a certain construction distance is usually maintained between preserved and new buildings due to construction safety requirements. This often results in expansion joints being installed at the ground floor slab between the preserved and new buildings. However, since the new building lacks a basement, the ground floor slab is in direct contact with the subgrade. The conventional approach involves using standard waterproofing materials between the slab and the subgrade, and installing embedded and external waterstops at the expansion joint, with waterproofing materials used for the basement waterproofing joint. Problems exist: 1. The ground floor slab has an expansion joint in direct contact with the subgrade. Conventional waterstops cannot guarantee permanent waterproofing effectiveness, leading to potential leaks. Furthermore, the waterproofing materials are inconvenient to replace periodically. When the expansion joint is located in a primary functional space, both aesthetics and waterproofing are critical; even minor leaks can pose a safety hazard.

[0003] For example, a Chinese patent discloses a hospital first-floor expansion joint and its construction method [application number: 201910301863.5], which includes waterproof construction of the expansion joint, waterproof material construction, positioning and marking of the expansion joint, drilling and positioning, embedding expansion bolts, installation of rubber reinforcing bars, installation of protective plates and covering with concrete. Utility Model Content

[0004] The purpose of this utility model is to address the above-mentioned problems by providing a waterproof structure for the first-floor expansion joint between new and old buildings in renovation and expansion projects.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A waterproofing structure for the first-floor expansion joint between old and new buildings in a renovated or expanded building project includes a first-floor slab of the existing building with a basement and a first-floor slab of the new building. A first-floor expansion joint is formed between the existing and new first-floor slabs. A ground paving layer is also laid on the existing and new first-floor slabs. Reinforced concrete walls No. 1 and No. 2 are respectively poured downwards on the lower sides of the existing and new first-floor slabs on both sides of the first-floor expansion joint. The No. 1 and No. 2 reinforced concrete walls form a civil engineering cavity. An underground reinforced concrete floor slab is poured at the bottom of the civil engineering cavity. The underground reinforced concrete floor slab has a bottom slab expansion joint corresponding to the first-floor expansion joint. The bottom slab expansion joint is filled with a multi-layer waterproof structure. A drainage structure connected to the sewage pipe in the basement is provided on the No. 1 reinforced concrete wall.

[0007] In the above-mentioned waterproofing structure for the first-floor expansion joint between new and old buildings in the renovation and expansion of buildings, the multi-layer waterproofing structure includes an external waterstop installed at the bottom of the expansion joint of the base slab, a first embedded waterstop installed in the middle of the expansion joint of the base slab, a first polystyrene board filling layer installed in the expansion joint of the base slab, and a first sealant sealing layer installed at the top of the expansion joint of the base slab.

[0008] In the above-mentioned waterproofing structure for the expansion joint between the old and new buildings in the renovation and expansion of buildings, a concrete cushion layer and a waterproofing layer for the bottom slab are also provided at the connection between the No. 1 reinforced concrete wall, the No. 2 reinforced concrete wall and the underground reinforced concrete floor slab and the ground.

[0009] In the above-mentioned waterproofing structure for the first-floor expansion joint between new and old buildings in the renovation and expansion of buildings, foam plastic rods are provided at the connection between the waterproof layer of the base slab and the expansion joint of the base slab.

[0010] In the above-mentioned waterproofing structure for the first-floor expansion joint between new and old buildings in the renovation and expansion of buildings, a No. 2 embedded waterstop is provided in the middle of the first-floor expansion joint, a No. 2 polystyrene board filling layer is provided on the lower side of the No. 2 embedded waterstop, a No. 2 sealant sealing layer is provided at the bottom of the first-floor expansion joint, and a first-floor waterstop is loosely laid on the top of the first-floor expansion joint.

[0011] In the above-mentioned waterproofing structure for the first-floor expansion joint between new and old buildings in the renovation and expansion of buildings, the top of the first-floor expansion joint is provided with an aluminum alloy base and a metal U-shaped groove expansion joint cover plate that can be laid with the same material as the ground paving layer.

[0012] In the above-mentioned waterproofing structure for the expansion joint between the old and new buildings in the renovation and expansion of buildings, the drainage structure includes a through-wall steel pipe, a sleeve, and a square water-stop steel ring pre-embedded in the No. 1 reinforced concrete wall. The outer end of the sleeve is fixedly connected to a drainage pipe that connects to the sewage pipe in the basement.

[0013] In the aforementioned waterproofing structure for the expansion joint between new and old buildings in the renovation and expansion of buildings, a cast iron grate is provided at the opening of the sleeve.

[0014] In the above-mentioned waterproofing structure for the expansion joint between the old and new buildings in the renovation and expansion of buildings, the No. 1 reinforced concrete wall is also pre-installed with an inspection port that will be sealed with concrete later.

[0015] Compared with existing technologies, the advantages of this utility model are:

[0016] 1. By pouring No. 1 and No. 2 reinforced concrete walls downwards on the sides of the existing first-floor slab of the original building and the underside of the first-floor slab of the new building respectively, a civil engineering cavity is formed. This prevents the first-floor slab from directly contacting the foundation layer, underground soil, and backfill. When a small amount of water seepage occurs, the water will seep into the civil engineering cavity instead of leaking into the first-floor expansion joint. This effectively utilizes the reinforced concrete cavity to achieve waterproofing, preventing ground damage and affecting the building's functionality due to leakage at the first-floor expansion joint, thus ensuring the normal use and structural safety of the building.

[0017] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure provided by this utility model. Detailed Implementation

[0019] like Figure 1As shown, a waterproof structure for the first-floor expansion joint between old and new buildings in a renovated or expanded building includes a first-floor slab 100 of the existing building with a basement and a first-floor slab 101 of the new building. A first-floor expansion joint 102 is formed between the existing and new first-floor slabs 101. A ground paving layer 12 is also laid on the existing and new first-floor slabs 101. The lower sides of the existing and new first-floor slabs 101 on both sides of the first-floor expansion joint 102 are respectively poured downwards to form... The No. 1 reinforced concrete wall 103 and the No. 2 reinforced concrete wall 104 form a civil engineering cavity 105. The bottom of the civil engineering cavity 105 is filled with an underground reinforced concrete floor slab 106. The underground reinforced concrete floor slab 106 has a bottom slab expansion joint 107 corresponding to the first floor expansion joint 102. The bottom slab expansion joint 107 is filled with a multi-layer waterproof structure. The No. 1 reinforced concrete wall 103 is provided with a drainage structure connected to the sewage pipe in the basement.

[0020] In this utility model, by pouring No. 1 reinforced concrete wall 103 and No. 2 reinforced concrete wall 104 downwards on the side of the existing first floor slab 100 and the new first floor slab 101 on both sides of the first floor expansion joint 102, a civil engineering cavity 105 is formed. This prevents the first floor slab from directly contacting the foundation layer, underground soil, and backfill. When a small amount of water seepage occurs, the water will seep into the civil engineering cavity 105 instead of seeping into the first floor expansion joint 102. This effectively utilizes the reinforced concrete cavity to achieve waterproofing, preventing ground damage and affecting the building's functionality due to leakage at the first floor expansion joint, thus ensuring the normal use and structural safety of the building.

[0021] Secondly, the multi-layer waterproof structure can minimize water seepage from the base plate expansion joint 107 into the civil engineering cavity. When a certain height of water accumulates in the civil engineering cavity, the water can be discharged through the drainage structure, preventing the first-floor expansion joint from directly contacting water.

[0022] Specifically, the multi-layer waterproof structure includes an external waterstop 3 installed at the bottom of the base plate expansion joint 107, a first embedded waterstop 4 installed in the middle of the base plate expansion joint 107, a first polystyrene board filling layer 5 installed inside the base plate expansion joint 107, and a first sealant sealing layer 6 installed at the top of the base plate expansion joint 107. The expansion joint 107 of the base slab is equipped with a multi-layer waterproof structure. The bottom external waterstop 3 is in direct contact with the water-facing surface, acting as a solid defense line to effectively prevent groundwater from seeping into the base slab expansion joint from the bottom. The middle embedded waterstop 4 adapts to the changes in the gap due to its own elastic deformation when the structure deforms, preventing groundwater from seeping along the gap. The first polystyrene board filling layer 5 provides deformation space while filling the gap. The top first sealant sealing layer 6 prevents external moisture and debris from entering and protects the internal waterproof structure. The multi-layer waterproof structure works together, combined with the design of using an external waterstop on the water-facing surface and an embedded waterstop inside, further reducing the risk of water leakage in the civil engineering cavity and improving the waterproof reliability of the base slab expansion joint.

[0023] Specifically, at the junctions of reinforced concrete wall 103, reinforced concrete wall 104, and underground reinforced concrete floor slab 106 with the ground, a concrete cushion layer 108 and a waterproof layer 109 are provided. Foamed plastic rods 2 are installed at the junction of the waterproof layer 109 and the expansion joint 107. The concrete cushion layer serves to level, isolate, and protect the structure. The waterproof layer further strengthens the foundation waterproofing. The foamed plastic rods buffer structural deformation stress and prevent damage to the waterproof layer. This strengthens waterproofing from the foundation level. Combined with the multi-layered waterproof structure of the expansion joint, this further reduces the risk of water leakage within the cavity, ensuring the waterproofing performance of the building foundation.

[0024] Preferably, a second embedded waterstop 40 is provided in the middle of the first-layer expansion joint 102. A second polystyrene board filling layer 50 is provided below the second embedded waterstop 40. A second sealant sealing layer 60 is provided at the bottom of the first-layer expansion joint 102. A first-layer waterstop 10 is also loosely laid on top of the first-layer expansion joint 102. An aluminum alloy base 11 and a metal U-shaped groove expansion joint cover plate 111, which can be laid with the same material as the ground paving layer 12, are provided on the top of the first-layer expansion joint 102. The multi-layer waterproof structure protects the first-layer expansion joint. The embedded waterstop blocks groundwater leakage, the polystyrene board provides buffering, the sealant prevents bottom water seepage, the first-layer waterstop enhances waterproofing, and the metal U-shaped groove expansion joint cover plate ensures both waterproofing and aesthetics. This series of designs echoes the waterproof structure of the base slab expansion joint, comprehensively reducing the risk of water leakage at the overall building expansion joint and improving the building's waterproofing performance and aesthetics.

[0025] Specifically, the drainage structure includes a through-wall steel pipe 9, a sleeve 8, and a square water-stop steel ring 7 pre-embedded in the No. 1 reinforced concrete wall 103. The outer end of the sleeve 8 is fixedly connected to a drainage pipe 14 that connects to the sewage pipe in the basement, and a cast iron grate 15 is installed at the pipe opening of the sleeve 8. The sleeve 8 and the square water-stop steel ring 7 prevent groundwater from leaking from the connection between the pipe and the wall, and the cast iron grate prevents debris from clogging the pipe, ensuring unobstructed drainage, timely removal of water accumulated in the cavity, and prevention of long-term water retention that could damage the building structure, further ensuring the building's waterproofing effect and structural safety.

[0026] Preferably, the No. 1 reinforced concrete wall 103 is also pre-installed with an inspection port 13 that will be sealed with concrete later. During construction, the construction quality of the drainage structure can be checked through the inspection port to ensure that the drainage pipes are installed correctly and connected firmly. If problems occur in the drainage system after the project is completed, they can also be repaired through the inspection port to ensure the long-term stable operation of the drainage system. This indirectly ensures that accumulated water can be discharged from the civil engineering cavity in a timely manner, thus maintaining the waterproofing effect of the building.

[0027] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A waterproof structure for the first-floor expansion joint between old and new buildings in a renovated or expanded building, comprising a first-floor slab (100) of the retained building with a basement and a first-floor slab (101) of the new building, wherein a first-floor expansion joint (102) is formed between the first-floor slab (100) of the retained building and the first-floor slab (101) of the new building, and a ground paving layer (12) is further laid on the first-floor slab (100) of the retained building and the first-floor slab (101) of the new building, characterized in that, The first floor slab (100) of the existing building and the first floor slab (101) of the new building on both sides of the first floor expansion joint (102) are respectively poured downward to form a No. 1 reinforced concrete wall (103) and a No. 2 reinforced concrete wall (104). The No. 1 reinforced concrete wall (103) and the No. 2 reinforced concrete wall (104) form a civil engineering cavity (105). The bottom of the civil engineering cavity (105) is filled with an underground reinforced concrete floor slab (106). The underground reinforced concrete floor slab (106) has a bottom plate expansion joint (107) corresponding to the first floor expansion joint (102). The bottom plate expansion joint (107) is filled with a multi-layer waterproof structure. The No. 1 reinforced concrete wall (103) is provided with a drainage structure connected to the sewage pipe in the basement.

2. The waterproofing structure for the first-floor expansion joint between new and old buildings in a renovated or expanded building, as described in claim 1, is characterized in that... The multi-layer waterproof structure includes an external waterstop (3) installed at the bottom of the base plate expansion joint (107), a first embedded waterstop (4) installed in the middle of the base plate expansion joint (107), a first polystyrene board filling layer (5) installed in the base plate expansion joint (107), and a first sealant sealing layer (6) installed at the top of the base plate expansion joint (107).

3. The waterproofing structure for the first-floor expansion joint between new and old buildings in a renovated or expanded building, as described in claim 2, is characterized in that... The No. 1 reinforced concrete wall (103), No. 2 reinforced concrete wall (104) and underground reinforced concrete floor slab (106) are also provided with a concrete cushion layer (108) and a waterproof layer (109) at the connection with the ground.

4. The waterproofing structure for the first-floor expansion joint between new and old buildings in a renovated or expanded building, as described in claim 3, is characterized in that... Foam plastic rods (2) are provided at the connection between the waterproof layer (109) of the base plate and the expansion joint (107) of the base plate.

5. The waterproofing structure for the first-floor expansion joint between new and old buildings in a renovated or expanded building, as described in claim 2, is characterized in that... The first-layer expansion joint (102) is provided with a No. 2 embedded waterstop (40) in the middle, and a No. 2 polystyrene board filling layer (50) is provided on the lower side of the No. 2 embedded waterstop (40). A No. 2 sealant sealing layer (60) is provided at the bottom of the first-layer expansion joint (102). The first-layer expansion joint (102) is also loosely covered with a first-layer waterstop (10).

6. The waterproofing structure for the first-floor expansion joint between new and old buildings in a renovated or expanded building, as described in claim 5, is characterized in that... The top of the first-layer expansion joint (102) is provided with an aluminum alloy base (11) and a metal U-shaped groove expansion joint cover plate (111) that can be laid with the same material as the ground paving layer (12).

7. The waterproofing structure for the first-floor expansion joint between old and new buildings in a renovated or expanded building, as described in any one of claims 1-6, is characterized in that... The drainage structure includes a through-wall steel pipe (9), a sleeve (8), and a square water-stop steel ring (7) pre-embedded in the No. 1 reinforced concrete wall (103). The outer end of the sleeve (8) is fixedly connected to a drainage pipe (14) that connects to the sewage pipe in the basement.

8. The waterproofing structure for the first-floor expansion joint between new and old buildings in a renovated or expanded building, as described in claim 7, is characterized in that... A cast iron grate (15) is provided at the opening of the sleeve (8).

9. The waterproofing structure for the first-floor expansion joint between new and old buildings in a renovated or expanded building, as described in any one of claims 1-6, is characterized in that... The No. 1 reinforced concrete wall (103) is also pre-installed with an inspection port (13) that will be sealed with concrete later.

Images