Waterproof structure of longitudinal horizontal construction joint of comprehensive pipe gallery

Abstract

The utility model discloses a comprehensive pipe gallery longitudinal horizontal construction joint waterproof structure, including the construction joint in the reinforced concrete structure side wall, the water face of reinforced concrete structure side wall is equipped with outer wall protection board, waterproof volume layer, waterproof volume reinforcing layer and polyurethane coating layer from outside to inside in proper order, waterproof volume reinforcing layer and polyurethane coating layer are set up with the position corresponding of construction joint, be provided with cement mortar layer and cement base penetration crystalline waterproof coating layer from top to bottom in construction joint, construction joint is set up in proper order from outside to inside water -swelling waterstop glue and pre -buried waterstop tape, and water -swelling waterstop glue, pre -buried waterstop tape stretches into reinforced concrete structure side wall. Outer wall protection board prevents the backfill soil of comprehensive pipe gallery side wall outside to destroy waterproof volume, and polyurethane coating layer strengthens waterproof effect, and blocks the moisture and enters construction joint, and cement base penetration crystalline waterproof coating layer lays cement mortar layer, ensures that concrete is combined closely, prevents producing cold joint.

Description

Technical Field

[0001] This utility model belongs to the field of waterproof construction technology for integrated utility tunnels, specifically relating to a waterproof structure for longitudinal horizontal construction joints in integrated utility tunnels. Background Technology

[0002] Water leakage in utility tunnels has always been a common quality problem plaguing underground construction projects. Preventing pipelines from being constantly submerged in leaking water and solving the waterproofing issue is one of the essential technical considerations in the construction of utility tunnels. Effectively solving the waterproofing problem ensures the construction quality of the utility tunnel, fundamentally reduces safety hazards, lowers later operation and maintenance costs, and extends its service life.

[0003] A construction joint is a joint formed between concrete poured in stages due to design requirements or construction needs. It's not a physical "seam," but rather a bonding surface between the first and second poured concrete sections, created when the first poured concrete exceeds its initial setting time. In underground utility tunnel projects, construction joints are weak points prone to leakage. Current leak prevention measures for construction joints are not entirely effective, and leaks occur frequently, necessitating improvement. Summary of the Invention

[0004] To address the problem of poor leak prevention in existing construction joints, this utility model provides a waterproof structure for longitudinal horizontal construction joints in integrated utility tunnels.

[0005] The objective of this utility model is achieved in the following manner:

[0006] A waterproof structure for longitudinal horizontal construction joints in an integrated utility tunnel includes a construction joint located within a reinforced concrete side wall. The water-facing side of the reinforced concrete side wall is provided with, from the outside to the inside, an external wall protective plate, a waterproof membrane layer, a reinforced waterproof membrane layer, and a polyurethane coating layer, with the reinforced waterproof membrane layer and polyurethane coating layer corresponding to the location of the construction joint. Inside the construction joint, from top to bottom, a cement mortar layer and a cement-based penetrating crystalline waterproof coating layer are provided. Inside the construction joint, from the outside to the inside, a water-swellable sealant and a pre-embedded waterstop are provided, extending into the reinforced concrete side wall.

[0007] The exterior wall protection panel is made of extruded polystyrene board.

[0008] The polyurethane coating layer includes a layer of mesh fabric or polypropylene fabric, and two layers of polyurethane waterproof coating are applied on the mesh fabric or polypropylene fabric.

[0009] The pre-embedded waterstop is a galvanized steel plate waterstop.

[0010] Water-swellable sealant is applied at the junction of the pre-embedded waterstop and the construction joint, with a cross-sectional dimension of (8-10) mm × (18-20) mm.

[0011] Compared to existing technologies, this invention adds an external wall protection plate to the outside of the conventional waterproof membrane layer to prevent backfill soil on the outside of the integrated pipe gallery side wall from damaging the waterproof membrane; it adds a polyurethane coating layer to the inside of the waterproof membrane reinforcement layer to further enhance the waterproof effect and prevent water from entering the construction joint; it applies a cement-based penetrating crystalline waterproof coating to the construction joint to form a cement-based penetrating crystalline waterproof coating layer to prevent water from entering the concrete; then it lays a cement mortar layer on the cement-based penetrating crystalline waterproof coating layer to ensure a tight bond between the concrete and prevent cold joints; and it uses galvanized steel plate waterstop with water-swellable sealant in the construction joint to effectively prevent water penetration and achieve the waterproof purpose. Attached Figure Description

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

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention. After reading the contents of the present invention, those skilled in the art can make various modifications or alterations to the present invention, and these equivalent forms also fall within the scope defined by the present invention.

[0014] like Figure 1 As shown, a waterproof structure for a longitudinal horizontal construction joint of an integrated utility tunnel includes a construction joint 8 located within a reinforced concrete side wall 1. The water-facing side of the reinforced concrete side wall 1 is provided with, from the outside to the inside, an external wall protection plate 2, a waterproof membrane layer 3, a waterproof membrane reinforcement layer 4, and a polyurethane coating layer 5. The waterproof membrane reinforcement layer 4 and the polyurethane coating layer 5 are positioned corresponding to the construction joint 8. A cement mortar layer and a cement-based penetrating crystalline waterproof coating layer are provided inside the construction joint 8 from top to bottom. A water-swellable sealant 6 and a pre-embedded waterstop 7 are provided inside the construction joint 8 from the outside to the inside. The water-swellable sealant 6 and the pre-embedded waterstop 7 extend into the reinforced concrete side wall 1.

[0015] This invention adds an external wall protection plate to the outside of the conventional waterproof membrane layer to prevent backfill soil on the outside of the integrated pipe gallery side wall from damaging the waterproof membrane; a polyurethane coating layer is added to the inside of the waterproof membrane reinforcement layer to further enhance the waterproof effect and prevent water from entering the construction joint; a cement-based penetrating crystalline waterproof coating is applied inside the construction joint to form a cement-based penetrating crystalline waterproof coating layer, preventing water from entering the concrete; a cement mortar layer is then laid on the cement-based penetrating crystalline waterproof coating layer to ensure a tight bond between the concrete and prevent cold joints; galvanized steel plate waterstop with water-swellable sealant is used inside the construction joint to effectively prevent water penetration and achieve the waterproof purpose.

[0016] For exterior wall protection panel 2, a 50mm thick extruded polystyrene (XPS) board is preferred to prevent the backfill soil on the outside from damaging the waterproof membrane. XPS board, also known as extruded polystyrene foam board, is a rigid closed-cell foam plastic board made from polystyrene resin as the main raw material, through heating, mixing, extrusion, and foaming. It has an independent honeycomb structure and features low thermal conductivity (0.028W / m·k), high compressive strength, waterproofing, moisture resistance, corrosion resistance, and a long lifespan (30-40 years).

[0017] The polyurethane coating layer 5 includes a layer of mesh fabric or polypropylene fabric, and two layers of polyurethane waterproof coating are applied to the mesh fabric or polypropylene fabric, with a total thickness of 1.2mm.

[0018] The pre-embedded waterstop 7 is a galvanized steel plate waterstop. Also known as a steel-edged rubber waterstop, this waterstop material is a composite of galvanized steel strip and rubber through a vulcanization process. Its cross-section adopts a non-uniform thickness structure, divided into a strength zone and a waterproof zone. Galvanized steel strips (0.5~1mm thick) are embedded on both sides of the rubber body and are connected and fixed to the reinforcing bars through installation holes, allowing it to withstand significant tensile and torsional forces.

[0019] Water-swellable sealant 6 is applied at the junction of the pre-embedded waterstop 7 and the construction joint 8, with a cross-sectional dimension of 8-10 mm × 18-20 mm.

[0020] Both the waterproof membrane layer and the waterproof membrane reinforcement layer can be made of 2mm thick cross-laminated self-adhesive waterproof membrane. Cross-laminated self-adhesive waterproof membrane, also known as cross-pressed self-adhesive waterproof membrane, uses a cross-layer design in its molding process, combining high-performance rubber asphalt to form a self-adhesive waterproof membrane. It has relatively stable performance, a certain strength, dimensional stability, and is not prone to deformation or cracking. It adheres firmly and is not easily damaged. It has self-healing properties, automatically healing small cracks. Construction is simple, and it can be applied using either wet or dry methods, saving on construction and labor costs. It is not affected by weather conditions and has a very wide range of applications.

[0021] This utility model's construction joint waterproofing structure prioritizes prevention, employing multiple layers of protection and combining rigidity and flexibility. The innovative improvements include: 1. Applying a cement-based penetrating crystalline waterproof coating to the horizontal construction joint first, forming a cement-based penetrating crystalline waterproof coating layer, effectively preventing moisture from entering the concrete. A 40mm thick 1:1 cement mortar layer is laid before pouring the concrete to ensure a tight bond and prevent cold joints. 2. Adding water-swellable sealing tape effectively prevents water penetration. 3. Adding a 1.2mm thick layer of polyurethane waterproof coating (one layer of fabric, two coats) to the side walls of the concrete structure further enhances the waterproofing effect and blocks moisture from entering the construction joint.

[0022] The steel plate waterstop is made of galvanized steel plate with a thickness of not less than 3mm, a width of 300mm or 400mm, and a length of 3 meters or 6 meters for easy transportation and installation. When positioning the waterstop steel plate, it should be placed in the middle of the wall, with the vertical construction joint facing the water-facing side, ensuring that it is consistent with the direction of water flow on the water-facing surface.

[0023] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A waterproof structure for longitudinal horizontal construction joints in an integrated utility tunnel, comprising a construction joint (8) located within a reinforced concrete sidewall (1), characterized in that: The water-facing side of the reinforced concrete structure side wall (1) is provided with an external wall protection plate (2), a waterproof membrane layer (3), a waterproof membrane reinforcement layer (4) and a polyurethane coating layer (5) from the outside to the inside. The waterproof membrane reinforcement layer (4) and the polyurethane coating layer (5) are set in the same position as the construction joint (8). The construction joint (8) is provided with a cement mortar layer and a cement-based penetrating crystalline waterproof coating layer from top to bottom. The construction joint (8) is provided with a water-swellable sealant (6) and a pre-embedded waterstop (7) from the outside to the inside. The water-swellable sealant (6) and the pre-embedded waterstop (7) extend into the reinforced concrete structure side wall (1).

2. The waterproof structure for the longitudinal horizontal construction joint of the integrated utility tunnel according to claim 1, characterized in that: The exterior wall protection panel (2) is an extruded polystyrene board.

3. The waterproof structure for the longitudinal horizontal construction joint of the integrated utility tunnel according to claim 1, characterized in that: The polyurethane coating layer (5) includes a layer of mesh cloth or polypropylene cloth, and two layers of polyurethane waterproof coating are applied on the mesh cloth or polypropylene cloth.

4. The waterproof structure for the longitudinal horizontal construction joint of the integrated utility tunnel according to claim 1, characterized in that: The pre-embedded waterstop (7) is a galvanized steel plate waterstop.

5. The waterproof structure for the longitudinal horizontal construction joint of the integrated utility tunnel according to claim 1, characterized in that: Water-swellable sealant (6) is placed at the junction of the pre-embedded waterstop (7) and the construction joint (8), with a cross-sectional size of (8-10) mm × (18-20) mm.

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