Prestress aqueduct pier top connecting structure

Abstract

The utility model belongs to the technical field of aqueduct design in the water conservancy industry, and discloses a prestressed aqueduct pier top connecting structure which comprises transition sections, end rib sections and connecting sections, the transition sections are integrally formed at the two ends of an aqueduct in a pouring mode, and the end rib sections are integrally formed at the outer side ends of the transition sections in a pouring mode. The connecting section is arranged between the nearby end faces of every two adjacent aqueducts, the connecting section and the nearby end rib section are integrally formed in a pouring mode, an expansion joint is arranged in the middle of the connecting section, a water stop unit is arranged at the expansion joint, and the connecting section and the end rib sections are fixedly connected with the pier top. According to the utility model, the permanent seam is directly arranged on the end rib section, and the post-pouring section is replaced by the connecting section arranged on the pier top. The connecting section reinforcing steel bars are not arranged as long as the prestressed groove body section and are independent pouring sections, construction of subsequent procedures is facilitated, meanwhile, a water stop unit is arranged, and the anti-seepage safety is improved.

Description

Technical Field

[0001] This utility model belongs to the field of aqueduct design technology in the water conservancy industry, and specifically relates to a prestressed aqueduct pier top connection structure. Background Technology

[0002] Prestressed simply supported U-shaped aqueducts are a commonly used structure in water diversion projects in the water conservancy industry. In previous designs, a concrete post-cast strip was typically installed on one side of the rib at the top of the aqueduct piers. This structure uses a copper waterstop between the post-cast strip and the end rib as a construction joint seal, and a permanent expansion joint is installed between the post-cast strips connecting the two simply supported aqueduct sections. This approach usually requires dense reinforcement within the post-cast strip, which runs the same length as the reinforcement in the aqueduct body. Since the length of one side of the post-cast section is typically 1 meter, and the total length on both sides is only 2 meters, the limited construction space not only creates significant difficulties for reinforcement pouring, waterstop installation, and concrete pouring, but also greatly interferes with the prestressing tensioning and subsequent grouting of the prestressed aqueduct, negatively impacting the quality of the prestressed anchor cable construction. Furthermore, since waterstops are installed on both sides of the post-cast section, between the post-cast strip and the end rib, three waterstops are effectively formed, all of which could become leakage channels during later operation, compromising seepage safety. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a prestressed aqueduct pier top connection structure. This structure directly incorporates a permanent joint in the end rib section, replacing the post-cast section with a connection section located on the pier top. The reinforcing steel in this connection section is not continuous with the prestressed aqueduct body, making it an independently cast section, which facilitates subsequent construction processes. Furthermore, it incorporates a water-stopping unit, enhancing seepage prevention safety.

[0004] The technical solution adopted by this utility model is a prestressed aqueduct pier top connection structure, including a transition section, an end rib section and a connecting section. The transition section is integrally cast at both ends of the aqueduct, the end rib section is integrally cast at the outer end of the transition section, and the connecting section is set between the nearest end faces of two adjacent aqueduct sections and is integrally cast with the nearest end rib section. An expansion joint is provided in the middle of the connecting section, and a water-stopping unit is provided at the expansion joint. Both the connecting section and the end rib section are fixedly connected to the pier top.

[0005] Furthermore, supports are fixedly installed on the bottom surfaces of both the connecting section and the end rib section, and the supports are fixedly connected to the top of the pier.

[0006] Furthermore, the water-stopping unit includes a water-stopping groove, a water-stopping strip, a filler, and a cover plate. The cover plate is fixedly connected to the opening end of the water-stopping groove, the water-stopping strip is fixedly installed on the inner end face of the water-stopping groove, and the filler is filled in the water-stopping groove.

[0007] Furthermore, the waterstop is a U-shaped waterstop at the bottom, with the U-shaped bottom of the waterstop embedded in the expansion joint and fitted with a rubber rod.

[0008] The beneficial effects of this utility model are as follows:

[0009] This invention replaces the post-cast section with a connecting section located at the top of the pier. The reinforcing bars of this connecting section are not continuous with the prestressed trough section; it is an independently cast section, cast after the prestressed trough sections on both sides are cast, the prestressed anchor cables are tensioned, and grouting is completed. Furthermore, this invention incorporates a water-stop unit. A water-stop groove is pre-installed between the expansion joints, containing a U-shaped adhesive water-stop strip, filler, and a cover plate for combined seepage prevention, forming a two-layer seepage barrier. This significantly improves seepage safety. If seepage occurs, each layer can be disassembled and inspected to address defects, avoiding the problems associated with conventional water-stop systems that are installed inside the concrete and difficult to handle when defects occur during simultaneous casting. Attached Figure Description

[0010] Figure 1 This is an elevation view of the overall structure of this utility model;

[0011] Figure 2 This is a schematic cross-sectional view of the connecting section of this utility model;

[0012] Figure 3 This is a schematic cross-sectional view of the support of this utility model;

[0013] Figure 4 This is a schematic cross-sectional view of the aqueduct body of this utility model;

[0014] Figure 5 This is a schematic diagram of the water-stopping unit structure of this utility model;

[0015] In the diagram: 1. Gradient section; 2. End rib section; 3. Connecting section; 4. Aqueduct; 5. Expansion joint; 6. Waterstop groove; 7. Waterstop strip; 8. Filler; 9. Cover plate; 10. Rubber rod; 11. Transverse prestressed anchor cable; 12. Longitudinal prestressed anchor cable; 13. Anchor head reserved groove; 14. Pier top; 15. Top tie beam; 16. Support. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer and more understandable, the technical solutions of this utility model will be further described in detail below with reference to the accompanying drawings of the embodiments of this utility model.

[0017] Reference Figures 1 to 5The present invention discloses a prestressed aqueduct pier top connection structure, comprising a transition section 1, an end rib section 2, and a connecting section 3. The transition section 1 is integrally cast at both ends of the aqueduct 4, and the end rib section 2 is integrally cast at the outer end of the transition section 1. The connecting section 3 is located between the nearest end faces of two adjacent aqueduct sections 4 and is integrally cast with the nearest end rib section 2. An expansion joint 5 is provided in the middle of the connecting section 3, and a water-stopping unit is provided at the expansion joint 5. Supports 16 are fixedly provided on the bottom surfaces of both the connecting section 3 and the end rib section 2, and the supports 16 are fixedly connected to the pier top 14. The water-stopping unit includes a water-stopping groove 6, a water-stopping strip 7, a filler 8, and a cover plate 9. The cover plate 9 is fixedly connected to the opening end of the water-stopping groove 6, the water-stopping strip 7 is fixedly installed on the inner end face of the water-stopping groove 6, the filler 8 is filled in the water-stopping groove 6, the water-stopping strip 7 is a bottom U-shaped water-stopping strip, and the U-shaped bottom of the water-stopping strip 7 is embedded in the expansion joint 5 and a rubber rod 10 is installed thereon.

[0018] A top tie beam 15 is provided on the top surface of the aqueduct 4, and transverse prestressed anchor cables 11 and longitudinal prestressed anchor cables 12 are provided on the outer surface of the aqueduct 4. An anchor head reserved groove 13 is provided on the top of the aqueduct 4 to facilitate the installation of the longitudinal prestressed anchor cables 12, and an anchor head reserved groove 13 is provided on the side of the end rib section 2 to facilitate the installation of the transverse prestressed anchor cables 12.

[0019] The water-stop groove 6 has a depth of 10cm to 15cm and a width of 30cm to 40cm. The cover plate 9 is in the form of horizontal bulges on both sides and outwards from the middle, and the height of the bulge is no more than 10cm.

[0020] In this utility model, the U-shaped waterstop 7 is preferably a U-shaped GB composite rubber waterstop, the rubber rod 10 adopts a U-shaped nose clamp rubber rod, the filler 8 is preferably an SR plastic filler, and the cover plate 9 is preferably a EPDM composite cover plate.

[0021] SR plastic filler 8 has the characteristics of flexible seepage prevention with strong deformation capacity. Together with U-shaped GB composite rubber waterstop 7 and EPDM composite cover plate 9, it forms a two-layer seepage barrier to improve seepage prevention safety.

[0022] The construction process for the above structure is as follows:

[0023] Step 1: First, install the end rib section 2 support 16 on the top 14 of the lower trough pier according to the design requirements, and pour the reinforced concrete trough body of the prestressed aqueduct on both sides, so that the longitudinal and transverse prestressed anchor cables are set in the anchor head reserved groove 13 as required by the drawings. At the same time, the galvanized expansion bolts for fixing the cover plates at both ends of the waterstop groove 7 are pre-cast together with the reinforced concrete to form a whole.

[0024] Step 2: Using the post-tensioning method, tension the longitudinal and transverse prestressed anchor cables sequentially according to the design requirements until the design tension force is required;

[0025] Step 3: Fill the anchor cable hole with grout and, after the strength reaches the design requirements, lock and fix the prestressed outer anchor head.

[0026] Step 4: Backfill the anchor head groove with micro-expansion concrete;

[0027] Step 5: Install the support 16 of the connecting section 3 on the top 14 of the lower pier according to the design requirements, and pour the reinforced concrete of the connecting section 3.

[0028] Step 6: Install the bottom U-shaped GB composite rubber waterstop (U-shaped nose clamping rubber rod), the groove SR plastic filler, and the top EPDM composite cover plate in sequence inside the waterstop groove.

[0029] Step 7: The bottom U-shaped GB composite rubber waterstop 7 (U-shaped nose clamp rubber rod) and the top EPDM composite cover plate 9 are fixed to the concrete surface on both sides by galvanized flat steel and galvanized expansion bolts to form a seal.

[0030] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A prestressed aqueduct pier top connection structure, characterized in that, It includes a transition section, an end rib section, and a connecting section. The transition section is integrally cast at both ends of the aqueduct. The end rib section is integrally cast at the outer end of the transition section. The connecting section is located between the nearest end faces of two adjacent aqueduct sections and is integrally cast with the nearest end rib section. An expansion joint is provided in the middle of the connecting section, and a water-stopping unit is provided at the expansion joint. Both the connecting section and the end rib section are fixedly connected to the top of the pier.

2. The prestressed aqueduct pier top connection structure according to claim 1, characterized in that, The bottom surfaces of both the connecting section and the end rib section are fixedly provided with supports, which are fixedly connected to the top of the pier.

3. The prestressed aqueduct pier top connection structure according to claim 1, characterized in that, The water-stopping unit includes a water-stopping groove, a water-stopping strip, a filler, and a cover plate. The cover plate is fixedly connected to the opening end of the water-stopping groove, the water-stopping strip is fixedly installed on the inner end face of the water-stopping groove, and the filler is filled in the water-stopping groove.

4. The prestressed aqueduct pier top connection structure according to claim 3, characterized in that, The waterstop is a U-shaped waterstop at the bottom, with the U-shaped bottom of the waterstop embedded in the expansion joint and fitted with a rubber rod.

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