Water blocking structure for concrete structural joint to act on ultrahigh water head

Abstract

The utility model belongs to the field of constructional engineering, and discloses a water blocking structure for a concrete structural joint to act on an ultrahigh water head, which comprises a copper waterstop and an expansion waterstop strip, the copper waterstop penetrates through the concrete structural joint and is positioned in concrete, the distance between the copper waterstop and the upstream face of the concrete is not less than 20cm, and the expansion waterstop strip is arranged in the concrete structural joint. The copper water stop belt located at the concrete structural joint is in a groove shape, and expansion water stop strips are embedded in concrete on the two sides of the structural joint and arranged on the copper water stop belt. The one-way and two-way water retaining device is suitable for building structural joints with high water heads and ultrahigh water heads, the principle is simple, machining and mounting are easy, the water retaining reliability is improved, and the one-way and two-way water retaining effect is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of construction engineering, and in particular relates to a water-blocking structure for ultra-high water head acting on concrete structural joints. Background Art

[0002] In the concrete engineering of the construction industry, expansion joints, settlement joints and seismic joints set between two adjacent buildings or two parts of a building to avoid temperature expansion, foundation settlement and earthquake collision, or interval joints that divide concrete structures according to structural design requirements are collectively referred to as structural joints. Structural joints must not only adapt to the deformation of the building, but also need to be equipped with water-blocking structures when the building needs to have a water-blocking function. Therefore, the waterstop strips used at the structural joints have the ability to deform without being damaged, and the part that penetrates into the concrete can extend the seepage path and prevent water leakage. In the water conservancy and hydropower industry, two or more waterstops are often arranged for structural joints that need to have water retaining properties. One or more types can be used. For example, two copper waterstops are often arranged on the upstream face of a gravity dam; when the height of a concrete panel rockfill dam exceeds 100m, three waterstops are arranged on the surface, middle and bottom of the concrete panel respectively. The waterstop types are plastic filler (or non-viscous filler) waterstop, waterstop (including rubber, PVC and copper waterstop), and copper waterstop from top to bottom; two waterstops are often arranged in the structural joints of a water diversion tunnel, and from the water-facing surface to the excavation surface, they are rubber waterstop and copper waterstop respectively.

[0003] For concrete structural joints that are subjected to high water heads (greater than or equal to 100m) and ultra-high water heads (greater than 200m), especially the high-pressure water diversion power generation tunnel of the pumped storage power station project, whose maximum effective water head is 700m, the use of multiple waterstops in concrete structural joints often encounters the following problems: (1) In the water conservancy and hydropower industry, the research on the water blocking and waterproofing effects of multiple waterstops in structural joints to withstand ultra-high water heads is not in-depth. Experiments have shown that: the PVC waterstop pre-embedded in concrete will cause seepage under a water pressure of 1.3Mpa (equivalent to a water head of 130m), that is, the water stop will fail; the copper waterstop pre-embedded in concrete will cause seepage under a water pressure of 1.5Mpa (equivalent to a water head of 150m), and the bonding strength between the copper waterstop and concrete is about 1.8Mpa, that is, when the water pressure exceeds 1.8Mpa, the cohesion between the copper waterstop and concrete is destroyed, and the contact surface between the two is separated to form a new seepage channel, resulting in water stop failure. Therefore, the water blocking principle of extending the seepage path alone is no longer effective for building structural joints with super-high water heads. (2) Due to the deformation requirements, the structural joints are wide, while the expansion waterstop strips are small in size, making construction and installation inconvenient. In general projects, expansion waterstop strips are rarely installed directly in the structural joints for water blocking.

[0004] In the process of engineering design, when multiple waterstops are used for structural joints with high and super high water heads, the principle can no longer meet the water blocking effect between joints. When arranging waterstop structures in structural joints, the above problems should be avoided. Therefore, it is necessary to improve the waterstop principle between structural joints with high water heads and design a reliable water blocking structure. Utility Model Content

[0005] The purpose of the utility model is to provide a water-blocking structure for concrete structural joints with super-high water heads. The utility model is suitable for building structural joints with high water heads and super-high water heads. It has a simple principle, is easy to process and install, improves the reliability of water blocking, and has unidirectional and bidirectional water-blocking effects.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A water-blocking structure for ultra-high water head in concrete structural joints, comprising a copper waterstop and an expansion waterstop strip, wherein the copper waterstop passes through the concrete structural joint and is located in the concrete, the copper waterstop is not less than 20 cm away from the water-facing surface of the concrete, the copper waterstop located at the concrete structural joint is in a groove shape, expansion waterstop strips are buried in the concrete on both sides of the structural joint, and the expansion waterstop strips are arranged on the copper waterstop strip.

[0008] Preferably, for one-way water blocking, the expansion water stop strip is arranged facing the water-facing surface of the concrete, and the "groove shape" of the copper water stop strip faces the seepage direction.

[0009] Preferably, for the bidirectional water-blocking structure, the expansion waterstop strips are arranged facing the concrete water-facing surface and facing away from the concrete water-facing surface, and the "groove shape" of the copper waterstop strips faces the main seepage direction.

[0010] Preferably, it also includes fastening plates, which are arranged on the copper waterstop strips on both sides of the structural seam, forming a groove band on the copper waterstop strip, and the expansion waterstop strip is arranged in the groove band on the copper waterstop strip.

[0011] Preferably, two groups of fastening plates with a spacing of 30 mm are arranged along the width direction of the copper waterstop to form a slot, and the two groups of fastening plates are arranged in sequence with a spacing of 50 mm along the length direction of the copper waterstop, and the slot forms the slot belt along the length direction of the copper waterstop.

[0012] The beneficial effects of the utility model are:

[0013] (1) It is suitable for a wide range of water heads, especially for structural joints of buildings with high and ultra-high water heads;

[0014] (2) The principle of the water-blocking structure is simple, practical and efficient.

[0015] (3) The processing and installation of the water-blocking structure are simple, that is, the water-blocking structure is processed and assembled in advance before concrete pouring.

[0016] (4) It is not easy to cause dislocation during the construction process, and it can effectively act in the structural joints to improve the reliability of water blocking.

[0017] (5) This structure has unidirectional and bidirectional water-retaining effects, especially for high-pressure concrete tunnels with bidirectional water-retaining properties. It can prevent the "internal water seepage" of water in the tunnel, improve the utilization rate of water resources, and prevent the "external water seepage" of groundwater in the mountain, thereby reducing the adverse effects of water accumulation in the tunnel during the construction and maintenance periods.

[0018] (6) Compared with the traditional design, when adopting the patented structure, only one structural joint needs to be arranged, which reduces the number of water-blocking structures and is conducive to the construction of sealing and caulking materials at the structural joints by pouring concrete first. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a detailed installation drawing of the one-way water-blocking water-blocking structure of the utility model.

[0020] Figure 2 It is a detailed drawing of the water-blocking structure of the utility model for one-way water retaining in the width direction.

[0021] Figure 3 It is a detailed installation drawing of the water-blocking structure of the utility model with two-way water retaining.

[0022] Figure 4 It is a detailed drawing of the width direction of the water-blocking structure of the bidirectional water retaining of the utility model.

[0023] Figure 5 It is a detailed plan view of the water-blocking structure of the utility model for one-way / two-way water retaining.

[0024] In the figure: 1. Seepage direction; 2. First cast concrete structure; 3. Later cast concrete structure; 4. Concrete facing the water surface; 5. Concrete structure joint filling material; 6. Copper waterstop; 7. Expansion waterstop strip; 8. Fastening plate; 9. Weld; 10. Center line. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings of the utility model.

[0026] like Figure 1-Figure 5 As shown, a water-blocking structure for ultra-high water head in concrete structure joints adopts a composite structure combining a fastening plate 8, an expansion waterstop strip 7 and a copper waterstop strip 6, including a copper waterstop strip 6, an expansion waterstop strip 7, a fastening plate 8 and a weld 9.

[0027] The copper waterstop 6 passes through the concrete structure joint and is located in the concrete. The copper waterstop 6 is not less than 20 cm away from the concrete water-facing surface 4. The copper waterstop 6 located at the concrete structure joint is in a groove shape. The fastening pieces 8 are arranged on the copper waterstop 6 on both sides of the structure joint 5. A slot belt is formed on the copper waterstop 6. The expansion waterstop strip 7 is installed in the slot belt on the copper waterstop 6. The expansion waterstop strip 7 is buried in the concrete on both sides of the structure joint.

[0028] For one-way water blocking, the expansion waterstop strip 7 is arranged facing the concrete water-facing surface 4, and the "groove shape" (nose) of the copper waterstop strip 6 faces the seepage direction 1 (low head side); for a two-way water blocking structure, the expansion waterstop strip 7 is arranged facing the concrete water-facing surface 4 and away from the concrete water-facing surface 4, and the "groove shape" (nose) of the copper waterstop strip 6 faces the main seepage direction 1 (low head side).

[0029] Two groups of fastening plates 8 with a spacing of 30 mm are arranged along the width of the copper waterstop 6 to form a slot, and the two groups of fastening plates 8 are arranged in sequence with a spacing of 50 mm along the length direction of the copper waterstop 6, and the slot forms a slot belt along the length direction of the copper waterstop 6. The fastening plates 8 and the copper waterstop 6 are welded to form a weld 9.

[0030] The copper waterstop strip 6 and the fastening plate 8 of the water-blocking structure are both processed with 1mm-1.2mm copper sheets, and the expansion waterstop strip 7 is a product with a specification of 50mx30mm (width x height).

[0031] The size of the copper waterstop 6 is determined according to the characteristics of the structural joint. The middle of the copper waterstop 6 is a "groove shape" (nose). The "groove shape" (nose) is 30mm high and 20mm wide, which is generally the same width as the structural joint. The length of the copper waterstop 6 is determined according to the length of the structural joint and the position of the water blocking structure. The unfolded width of the copper waterstop 6 is 381mm, the middle 71mm is processed into a nose shape, and the 25mm long edges at both ends are bent 45° in the opposite direction of the nose. The total width after processing is 316mm.

[0032] The fastening piece 8 is processed into a rectangular structure with a length of 50mm and a width of 10mm, and the number is determined according to the layout form and the length of the structural seam. For the water-blocking structure with one-way water blocking, the fastening piece 8 is symmetrically arranged on both sides of the "groove shape" (nose) of the copper waterstop 6 and vertically arranged on the surface of the copper waterstop 6, with two arranged on each side (four arranged for two-way water blocking), and a total of four pieces are arranged in the width direction section of each copper waterstop 6 (eight arranged for two-way water blocking), and each piece is welded on the copper waterstop 6. The first fastening piece 8 on each side is arranged 85mm from the edge of the copper waterstop 6, and the second one is 30mm away from the first one. The two fastening pieces 8 on each side form a group of slots (a total of 2 groups for two-way water blocking), a total of 2 groups of slots (a total of 4 groups for two-way water blocking). The fastening pieces 8 are arranged in sequence along the length direction of the waterstop 6 at intervals of 50mm, and the slots form 2 groups of slot bands along the length direction of the copper waterstop 6 (4 groups for two-way water blocking).

[0033] The principle is: the "groove shape" (nose) of the copper waterstop strip 6 adapts to the deformation of the structure. The expansion waterstop strips 7 on both sides of the structural seam serve as the first barrier water blocking structure. The water blocking principle is to block the leakage channel after swelling in water, greatly preventing the high-pressure water seepage from passing through. The function is to withstand the high-pressure water head in the structural seam to protect the copper waterstop strips 6 on the outside of the two expansion waterstop strips 7, and avoid the copper waterstop strips 6 from being directly affected by high-pressure water and failing. The copper waterstop strips 6 on the outside of the expansion waterstop strips 7 serve as the second barrier water blocking structure. The principle is to extend the seepage path to reduce the low-pressure water head that bypasses the expansion waterstop strips 7.

[0034] The water-blocking structure can adapt to the deformation of the structural joint and can effectively prevent water seepage through two different water-blocking structures.

[0035] The method of using the utility model is as follows:

[0036] (I) Processing water-blocking structure

[0037] 1. First, according to the water-retaining characteristics of the building, determine whether to choose a one-way water-retaining water-blocking structure or a two-way water-retaining water-blocking structure.

[0038] 2. The copper waterstop strip 6 and the fastening plate 8 of the water-blocking structure are both processed with 1mm-1.2mm copper sheets, and the expansion waterstop strip 7 is a product with a specification of 50mx30mm (width x height).

[0039] 3. The size of the copper waterstop 6 of the water-blocking structure is determined according to the characteristics of the structural joint. The middle of the copper waterstop 6 is a "groove-shaped" (nose). The "groove-shaped" (nose) is 30mm high and 20mm wide, which is generally the same width as the structural joint. The length of the copper waterstop 6 is determined according to the length of the structural joint and the location of the water-blocking structure. The unfolded width of the copper waterstop 6 is 381mm, the middle 71mm is processed into a nose shape, and the 25mm long edges at both ends are bent 45° in the opposite direction of the nose. The total width after processing is 316mm.

[0040] 4. The fastening pieces 8 of the water-blocking structure are processed into a rectangular structure with a length of 50 mm and a width of 10 mm. The number is determined according to the layout form and the length of the structural seam. For the water-blocking structure with one-way water blocking, the fastening pieces 8 are symmetrically arranged on both sides of the "groove shape" (nose) of the copper waterstop 6 and vertically arranged on the surface of the copper waterstop 6, with two arranged on each side (four arranged for two-way water blocking), and a total of four pieces are arranged in the width direction section of each copper waterstop 6 (eight arranged for two-way water blocking), and each piece is welded on the copper waterstop 6. The first fastening piece 8 on each side is arranged 85 mm from the edge of the copper waterstop 6, and the second one is 30 mm from the first one. The two fastening pieces 8 on each side form one group of slots (two groups in total for two-way water blocking), and a total of two groups of slots (four groups in total for two-way water blocking). The fastening pieces 8 are arranged in sequence along the length direction of the waterstop 6 at intervals of 50 mm, and the slots form two groups of slot bands along the length direction of the copper waterstop 6 (four groups in total for two-way water blocking).

[0041] 5. Install expansion water stop strips in the slot to form a water blocking structure.

[0042] (2) Install water-blocking structure.

[0043] The water blocking structure is installed at the concrete structure joint, not less than 20cm away from the concrete water-facing surface 4. The "groove-shaped" (nose) of the copper waterstop 6 of the water blocking structure is located in the structure joint, and the center line 10 of the water blocking structure coincides with the center of the structure joint. For one-way water blocking, the expansion waterstop strip 7 of the water blocking structure faces the concrete water-facing surface 4, and the "groove-shaped" (nose) of the copper waterstop 6 faces the seepage direction (low head side); for two-way water blocking structure, the expansion waterstop strip 7 of the water blocking structure faces the concrete water-facing surface 4 and is arranged away from the concrete water-facing surface 4, and the "groove-shaped" (nose) of the copper waterstop 6 faces the main seepage direction (low head side). The water blocking structure can be fixed by steel bars arranged in the concrete or by installing positioning steel bars to ensure firm fixation.

[0044] (III) Concrete is poured on both sides of the structural joint according to the construction sequence. The concrete on both sides is poured concrete structure 2 first and concrete structure 3 later, and concrete structural joint filling material 5 is installed before pouring concrete structure 3 later.

Claims

1. A water-blocking structure for ultra-high water head in concrete structural joints, characterized in that: It includes a copper waterstop and an expansion waterstop strip. The copper waterstop passes through the concrete structure joint and is located in the concrete. The copper waterstop is not less than 20 cm away from the water-facing surface of the concrete. The copper waterstop located at the concrete structure joint is in a groove shape. Expansion waterstop strips are buried in the concrete on both sides of the structure joint, and the expansion waterstop strip is arranged on the copper waterstop.

2. The water-blocking structure for ultra-high water head in concrete structural joints according to claim 1 is characterized in that: For one-way water blocking, the expansion waterstop is arranged facing the water-facing surface of the concrete, and the "groove shape" of the copper waterstop faces the seepage direction.

3. The water-blocking structure for ultra-high water head in concrete structural joints according to claim 1 is characterized in that: For the bidirectional water-blocking structure, the expansion waterstop strips are arranged facing the concrete water-facing surface and facing away from the concrete water-facing surface, and the "groove shape" of the copper waterstop strip faces the main seepage direction.

4. The water-blocking structure for ultra-high water head in concrete structural joints according to claim 1 is characterized in that: It also includes fastening plates, which are arranged on the copper waterstop strips on both sides of the structural seam, forming a groove band on the copper waterstop strip, and the expansion waterstop strip is arranged in the groove band on the copper waterstop strip.

5. The water-blocking structure for ultra-high water head in concrete structural joints according to claim 4 is characterized in that: Two groups of fastening plates with a spacing of 30 mm are arranged along the width direction of the copper waterstop to form a slot. The two groups of fastening plates are arranged in sequence with a spacing of 50 mm along the length direction of the copper waterstop to form the slot belt along the length direction of the copper waterstop.

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