A construction method for combined reinforcement and renovation of garage roof expansion joints

Abstract

This invention relates to the field of expansion joint reinforcement and renovation construction technology, specifically to a combined reinforcement and renovation construction method for garage roof expansion joints, comprising the following steps: Step 1: roughening the original expansion joint of the garage roof; Step 2: installing water-swellable sealing strips at the middle position of the construction joints on both sides of the expansion joint; Step 3: installing pouring templates for the raised expansion joint concrete structure on both sides of the expansion joint; Step 4: pouring concrete and installing waterstops; subsequent steps also include installing foam rods, waterproof membrane, waterproof aluminum cover plate for the expansion joint, concrete protective cover plate, and concrete protective layer, etc. The construction method of this invention effectively solves the hidden dangers of leakage and instability at the raised expansion joint position when adding a green roof to a garage roof, and achieves the effective effect of enhancing the waterproof performance of the raised expansion joint and reinforcing the expansion joint structure.

Description

Technical Field

[0001] This invention relates to the field of expansion joint reinforcement and renovation construction technology, and in particular to a combined reinforcement and renovation construction method for expansion joints in garage roof slabs. Background Technology

[0002] With rapid urban development, there are more and more renovation, expansion, and urban renewal projects. The renovation of old residential areas and the improvement of office environments in buildings have not only improved the living environment but also enhanced urban vitality. As one such renovation project, adding green roofs to garage roofs not only adds a touch of green to the city but also provides residents with places for rest and recreation. In the early stages of garage construction, to prevent cracking or damage from external factors, expansion joints are usually reserved in the garage structure. When adding green roofs to garage roofs, the original expansion joints need to be raised before adding soil. Therefore, raising the expansion joint location can easily lead to leakage and instability. Summary of the Invention

[0003] This invention addresses the potential leakage and instability issues caused by raising the original garage expansion joint when adding or modifying a garage roof into a green roof. It provides a combined reinforcement and renovation construction method for garage roof expansion joints.

[0004] To achieve the above objectives, the technical solution adopted by this invention is: a construction method for combined reinforcement and renovation of garage roof expansion joints, comprising the following steps:

[0005] Step 1: Roughen the concrete surface on both sides of the original expansion joint location of the garage roof slab where the height needs to be increased, and designate the roughened area as the construction joint.

[0006] Step 2: Open a construction groove for the water-swellable sealing strip in the middle of the construction joint on both sides of the expansion joint. Clean the cement slurry, debris and dust on the concrete surface of the construction joint and the construction groove. Embed the water-swellable sealing strip into the construction groove in the middle of the construction joint.

[0007] Step 3: Install the pouring formwork for the heightened expansion joint concrete structure on both sides of the expansion joint;

[0008] Step 4: Pour concrete and install waterstops;

[0009] Step 5: Install the foam rods;

[0010] Step 6: Clean the joint between the garage roof slab and the raised expansion joint concrete structure, as well as the plane and vertical surfaces of the raised expansion joint concrete structure. Then, lay the waterproof membrane to cover the outer vertical surface and the upper plane of the raised expansion joint concrete structure.

[0011] Step 7: Install the waterproof aluminum cover plate for the expansion joint above the raised concrete structure of the expansion joint;

[0012] Step 8: Install a precast inverted U-shaped concrete protective cover plate on top of the waterproof aluminum cover plate of the expansion joint;

[0013] Step 9: Pour a 175mm thick C20 fine aggregate L-shaped concrete protective layer under the two facades of the precast inverted U-shaped concrete protective cover plate.

[0014] Step 10: Install a removable waterstop at the bottom of the expansion joint using expansion bolts, and install a metal water tray below the removable waterstop.

[0015] As a preferred option, after cleaning the cement laitance, debris and dust from the concrete surface of the construction joint and construction trench in step two, a concrete interface agent is applied to the construction joint.

[0016] Preferably, the water-swellable sealing strip in step two is a putty-type water-swellable sealing strip.

[0017] By adopting the technical solution of roughening the upper surface of both sides of the original expansion joint and applying concrete interface agent, the bonding force between the concrete on both sides of the original expansion joint and the concrete of the heightened expansion joint concrete structure is significantly increased. This increases the contact area between the later-poured concrete and the old concrete, making the heightened expansion joint concrete structure more robust. At the same time, the addition of a putty-type water-swellable sealing strip between the new and old concrete achieves the beneficial effect of enhancing the sealing of the bonding surface.

[0018] Preferably, the waterstop in step four includes a pre-embedded waterstop and an external waterstop. During installation, concrete is first poured into the formwork on both sides until the middle of the formwork height is reached. Before the concrete reaches initial setting, the pre-embedded waterstop is pre-embedded, with the pre-embedded waterstop penetrating into the concrete on both sides by no less than 150mm. Then, concrete is poured into the formwork on both sides until it is full. Before the top concrete reaches initial setting, the external waterstop is embedded into the surface of the concrete on both sides, with the external waterstop penetrating into the concrete on both sides by no less than 150mm. The external waterstop is recessed at the expansion joint.

[0019] Preferably, polystyrene strips are filled into the expansion joint before installing the pre-embedded waterstop and the external waterstop, respectively.

[0020] As a preferred embodiment, in step seven, both sides of the waterproof aluminum cover plate for the expansion joint are fixed to the exterior of the raised expansion joint concrete structure using metal expansion bolts.

[0021] By adopting a technical solution of installing pre-embedded waterstops, external waterstops, and waterproof aluminum covers for the expansion joints from bottom to top, and wrapping them with waterproof membrane, a multi-layer waterproof protection is formed, which further enhances the waterproof performance of the expansion joints and effectively prevents seepage and leakage.

[0022] Preferably, in step nine, the upper end of the L-shaped concrete protective layer is connected to the lower end of the inverted U-shaped concrete protective cover plate, and is equipped with a 6@200 single-layer bidirectional steel mesh.

[0023] By installing an inverted U-shaped concrete protective plate at the top of the heightened expansion joint concrete structure and pouring an L-shaped concrete protective layer at the bottom, with the bottom of the inverted U-shaped concrete protective plate and the top of the poured L-shaped concrete protective layer connected, a completely closed protective shell is formed on the outside of the heightened expansion joint concrete structure. This prevents adverse consequences such as tensile cracking after the top surface is covered with soil, achieving the beneficial effect of effectively protecting the heightened expansion joint concrete structure and enhancing the stability of the structure.

[0024] Preferably, in step ten, the expansion bolt passes through the fastening pressure plate, butyl sealing tape, detachable waterstop, butyl sealing tape, and concrete in sequence from bottom to top.

[0025] As a preferred embodiment, the bottom of the metal water tray in step ten is equipped with a drain pipe, which is connected to a drainage ditch or a water collection pit.

[0026] In summary, the present invention has the following beneficial technical effects:

[0027] 1. By adopting the technical solution of roughening the upper surface of both sides of the original expansion joint and applying concrete interface agent, the bonding force between the concrete on both sides of the original expansion joint and the concrete structure of the heightened expansion joint is significantly increased, the contact area between the later-poured concrete and the old concrete is increased, making the concrete structure of the heightened expansion joint more solid. At the same time, the addition of a putty-type water-swellable sealing strip between the new and old concrete achieves the beneficial effect of enhancing the sealing of the bonding surface.

[0028] 2. By adopting a technical solution of setting up pre-embedded waterstops, external waterstops, and waterproof aluminum covers for expansion joints from bottom to top, as well as wrapping the exterior with waterproof membrane, a multi-layer waterproof protection is formed, which further enhances the waterproof performance of the raised expansion joint and achieves the beneficial effect of effectively preventing water seepage and leakage.

[0029] 3. By installing an inverted U-shaped concrete protective cover plate at the top of the heightened expansion joint concrete structure and pouring an L-shaped concrete protective layer at the bottom, with the bottom of the inverted U-shaped concrete protective plate and the top of the poured L-shaped concrete protective layer connecting, a completely closed protective shell is formed on the outside of the heightened expansion joint concrete structure. This prevents adverse consequences such as tensile cracking after the top surface is covered with soil, achieving the beneficial effect of effectively protecting the heightened expansion joint concrete structure and enhancing the stability of the structure. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the cross-sectional structure for the reinforcement and renovation of the expansion joints on the garage roof;

[0031] Explanation of reference numerals in the attached drawings: 1-Construction joint; 2-Water-swellable waterstop strip; 3-Construction trench; 4-Embedded waterstop; 5-External waterstop; 6-Polystyrene strip; 7-Foam rod; 8-Garage roof slab; 9-Waterproof membrane; 10-Raised expansion joint concrete structure; 11-Waterproof aluminum cover plate for expansion joint; 12-Inverted U-shaped concrete protective cover plate; 13-L-shaped concrete protective layer; 14-Removable waterstop; 141-Expansion bolt; 15-Metal water tray; 151-Drainage pipe. Implementation

[0032] The following is in conjunction with the appendix Figure 1 The present invention will be described in further detail below.

[0033] An embodiment of the present invention discloses a construction method for combined reinforcement and renovation of garage roof expansion joints, such as... Figure 1 As shown, it includes the following steps:

[0034] Step 1: Roughen the concrete surface on both sides of the original expansion joint location of the garage roof slab 8 where the height needs to be increased, and designate the roughened location as construction joint 1.

[0035] Step 2: Open a construction groove 3 for the water-swellable waterstop strip 2 in the middle of the construction joint 1 on both sides of the expansion joint. Clean the cement slurry, debris and dust on the concrete surface of the construction joint 1 and the construction groove 3. Embed the water-swellable waterstop strip 2 into the construction groove 3 in the middle of the construction joint 1. Apply concrete interface agent to the construction joint 1. The water-swellable waterstop strip 2 is a putty-type water-swellable waterstop strip.

[0036] Step 3: Install the pouring formwork for raising the concrete structure 10 of the expansion joint on both sides of the expansion joint; determine the height of the raised concrete structure 10 of the expansion joint according to the thickness of the backfill soil and select the corresponding concrete pouring formwork. The expansion joint is usually raised by 10-20cm.

[0037] Step 4: Pour concrete and install waterstops; the waterstops include embedded waterstops 4 and external waterstops 5. During installation, first pour concrete into the formwork on both sides until the middle of the formwork height, fill the expansion joint with polystyrene strips 6, and embed the embedded waterstops 4 before the concrete reaches initial setting. The embedded waterstops 4 should penetrate into the concrete on both sides by no less than 150mm. Then, continue to pour concrete into the formwork on both sides until it is full, and fill the expansion joint with polystyrene strips 6 again. Before the top concrete reaches initial setting, embed the external waterstops 5 into the concrete surface on both sides. The external waterstops 5 should be embedded into the concrete on both sides by no less than 150mm, and the external waterstops 5 should be recessed at the expansion joint.

[0038] Step 5: Place foam rod 7 in the recessed part of the external waterstop 5.

[0039] Step 6: Clean the joint between the garage roof slab 8 and the raised expansion joint concrete structure 10, as well as the plane and vertical surfaces of the raised expansion joint concrete structure 10. Then, lay the waterproof membrane 9 so that it covers the outer vertical surface and the upper plane of the raised expansion joint concrete structure 10.

[0040] Step 7: Install the waterproof aluminum cover plate 11 for the expansion joint on the top of the raised expansion joint concrete structure 10. Both sides of the waterproof aluminum cover plate 11 are fixed to the outer facade of the raised expansion joint concrete structure 10 with metal expansion anchor bolts.

[0041] Step 8: Install a precast inverted U-shaped concrete protective cover plate 12 on the upper part of the waterproof aluminum cover plate 11 of the expansion joint.

[0042] Step 9: Pour a 175mm thick C20 fine stone L-shaped concrete protective layer 13 under the two facades of the precast inverted U-shaped concrete protective cover plate 12; the L-shaped concrete protective layer 13 is reinforced with a 6@200 single-layer bidirectional steel mesh, the upper end of which is connected to the lower end of the inverted U-shaped concrete protective cover plate 12, the facade is connected to the facade of the raised expansion joint concrete structure 10, and the bottom surface is connected to the garage roof slab 8.

[0043] Step 10: Install a removable waterstop 14 at the bottom of the expansion joint using expansion bolts 141. As shown, the expansion bolts 141 pass through the fastening pressure plate, butyl sealant tape, removable waterstop 14, butyl sealant tape and concrete from bottom to top. Install a metal water tray 15 below the removable waterstop 14. A drain pipe 151 is installed at the bottom of the metal water tray 15. The drain pipe 151 is connected to a drainage ditch or sump.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A construction method for combined reinforcement and renovation of garage roof expansion joints, characterized in that, Includes the following steps: Step 1: Roughen the concrete surface on both sides of the original expansion joint location of the garage roof slab where the height needs to be increased, and designate the roughened area as the construction joint. Step 2: Open a construction groove for the water-swellable sealing strip in the middle of the construction joint on both sides of the expansion joint. Clean the cement slurry, debris and dust on the concrete surface of the construction joint and the construction groove. Embed the water-swellable sealing strip into the construction groove in the middle of the construction joint. Step 3: Install the pouring formwork for the heightened expansion joint concrete structure on both sides of the expansion joint; Step 4: Pour concrete and install waterstops; Step 5: Install the foam rods; Step 6: Clean the joint between the garage roof slab and the raised expansion joint concrete structure, as well as the plane and vertical surfaces of the raised expansion joint concrete structure. Then, lay the waterproof membrane to cover the outer vertical surface and the upper plane of the raised expansion joint concrete structure. Step 7: Install the waterproof aluminum cover plate for the expansion joint above the raised concrete structure of the expansion joint; Step 8: Install a precast inverted U-shaped concrete protective cover plate on top of the waterproof aluminum cover plate of the expansion joint; Step 9: Pour a 175mm thick C20 fine stone L-shaped concrete protective layer under the two facades of the precast inverted U-shaped concrete protective cover plate; the upper end of the L-shaped concrete protective layer is connected to the lower end of the inverted U-shaped concrete protective cover plate, and the L-shaped concrete protective layer is reinforced with a single layer of bidirectional steel mesh. Step 10: Install a removable waterstop at the bottom of the expansion joint using expansion bolts, and install a metal water tray below the removable waterstop.

2. The construction method for combined reinforcement and renovation of garage roof expansion joints according to claim 1, characterized in that, In step two, after cleaning the cement slurry, debris, and dust from the concrete surface of the construction joint and construction trench, a concrete interface agent is applied to the construction joint.

3. The construction method for combined reinforcement and renovation of garage roof expansion joints according to claim 1, characterized in that, The water-swellable sealing strip in step two is a putty-type water-swellable sealing strip.

4. The construction method for combined reinforcement and renovation of garage roof expansion joints according to claim 1, characterized in that, The waterstop in step four includes a pre-embedded waterstop and an externally attached waterstop. During installation, concrete is first poured into the formwork on both sides until the middle of the formwork height is reached. Before the concrete reaches initial setting, the pre-embedded waterstop is pre-embedded, with the pre-embedded waterstop penetrating into the concrete on both sides by at least 150mm. Then, concrete is poured into the formwork on both sides until it is full. Before the top concrete reaches initial setting, the externally attached waterstop is embedded into the surface of the concrete on both sides, with the externally attached waterstop penetrating into the concrete on both sides by at least 150mm. The externally attached waterstop is recessed at the expansion joint.

5. The construction method for combined reinforcement and renovation of garage roof expansion joints according to claim 4, characterized in that, Polystyrene strips were filled into the expansion joints before installing the pre-embedded waterstop and the external waterstop, respectively.

6. The construction method for combined reinforcement and renovation of garage roof expansion joints according to claim 1, characterized in that, In step seven, the waterproof aluminum cover plate for the expansion joint is fixed to the outer facade of the raised expansion joint concrete structure with metal expansion bolts on both sides.

7. The construction method for combined reinforcement and renovation of garage roof expansion joints according to claim 1, characterized in that, The L-shaped concrete protective layer is reinforced with a 6@200 single-layer bidirectional steel mesh.

8. The construction method for combined reinforcement and renovation of garage roof expansion joints according to claim 1, characterized in that, In step ten, the expansion bolts pass through the fastening pressure plate, butyl sealing tape, detachable waterstop, butyl sealing tape, and concrete in sequence from bottom to top.

9. The construction method for combined reinforcement and renovation of garage roof expansion joints according to claim 1, characterized in that, The bottom of the metal water tray in step ten is equipped with a drain pipe, which is connected to a drainage ditch or a collection pit.

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