Full-prefabricated assembly type pre-tensioning method prestress pi beam pile slab bridge construction system

Abstract

The utility model relates to a full-prefabricated assembly type pre-tensioning method prestress Pi beam pile slab bridge construction system which comprises an expansion platform. The expansion platform is fixed on the pipe pile through a temporary hoop and is used for assisting hoisting of the prefabricated cover beam and supporting of a wet joint between the prefabricated pi-shaped beams; when the prefabricated cover beam is hoisted, the expansion platform is provided with a limiting support and a jacking position correcting device. The device has the advantages that the expansion platform is arranged on the top of the prefabricated pipe pile on the basis of the temporary hoop, a temporary auxiliary falling support system is formed and used for completing core grouting operation on the top of the pipe pile, the limiting support and the jacking position correcting device are additionally arranged to improve the installation precision of the prefabricated cover beam, and the construction quality is effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of highway engineering, and particularly includes a construction system for a fully prefabricated and assembled pretensioned prestressed π-beam pile slab bridge Background Technique

[0002] As a lifeline node project, bridges are making great strides towards the direction of prefabrication and industrialization. The fully prefabricated and assembled pretensioned prestressed π-beam pile slab bridge integrates the concepts of industrialized construction and green building materials, and has the advantages of high load-bearing capacity, strong seismic resistance, convenient prefabrication, and environmental protection during construction.

[0003] While prefabricated bridges have high economic and social benefits, they also put forward higher requirements for the integrated installation accuracy. Especially for the fully prefabricated and assembled pretensioned prestressed π-beam pile slab bridge, the whole installation process involves multiple construction processes such as the installation of precast pipe piles, precast capping beams, and precast π-beam slabs. At present, less research has been done on the construction methods and auxiliary facilities of the fully prefabricated and assembled pretensioned prestressed π-beam pile slab bridge, mainly focusing on the prefabrication and installation of the upper pretensioned prestressed π-beams, and insufficient research has been done on the construction of the lower structure involved in the fully prefabricated system, especially the construction of the precast capping beam part and the construction of the wet joints.

[0004] In view of this, there is an urgent need to invent a formwork construction system for side walls with strong stability, high transfer efficiency, simple installation operation, and prominent economic and technical benefits at present. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a construction system for a fully prefabricated and assembled pretensioned prestressed π-beam pile slab bridge.

[0006] This construction system for a fully prefabricated and assembled pretensioned prestressed π-beam pile slab bridge includes an extended platform; the extended platform is fixed on the pipe pile through a temporary hoop and is used to assist in the hoisting of the precast capping beam and the formwork support for the wet joint between the precast π-beams;

[0007] When hoisting the precast capping beam, a limit bracket and a jacking alignment device are arranged on the extended platform;

[0008] Precast π-beams are arranged above the front and rear adjacent sections of the precast capping beam. When pouring the wet joint between the precast π-beams, special-shaped formwork is installed at the transverse wet joint section between the precast π-beams.

[0009] Preferably, sliding auxiliary supports are symmetrically embedded on the top pipe wall of the pipe pile, and pulleys are arranged at the ends of the sliding auxiliary supports; a winch is arranged on the foundation at the bottom of the pipe pile, and the towing rope of the winch is connected to the winch temporary hoop through the pulley for the lifting of the temporary hoop; a ladder is installed on the pipe pile along the height direction.

[0010] Preferably, end plate connection holes are provided on the web of the temporary hoop. The extended platform is provided with extended platform connection holes corresponding to the end plate connection holes. The temporary hoop is connected and fixed to the extended platform through the end plate connection holes and the extended platform connection holes. Hydraulic struts are arranged on both sides of the temporary hoop and are connected to the bottom surface of the extended platform.

[0011] Preferably, the extended platform is composed of two groups of semi-circular structures that are symmetrical left and right. The top surface of a single extended platform is provided with a slide rail, a far point connection base, and a near point connection base; the far point connection base and the near point connection base are used for installing a limit bracket, and the lifting alignment device is installed on the slide rail for the positioning of the precast capping beam.

[0012] Preferably, the precast capping beam is a left-middle-right segmented structure. The middle segment of the precast capping beam is placed on the top of the pipe pile. An auxiliary lifting beam is installed on the middle segment of the precast capping beam. The auxiliary lifting beam extends horizontally to the left and right sides of the middle segment of the precast capping beam. The auxiliary lifting beam is connected to the precast capping beam through an auxiliary connecting piece. Suspension rods are arranged on both sides of the auxiliary lifting beam, and a bottom supporting beam is arranged at the bottom of the suspension rod for supporting the left and right segments of the precast capping beam.

[0013] Preferably, the precast capping beam is a cantilever capping beam. An auxiliary positioning hoop is arranged on the pipe pile below the cantilever capping beam. A T-shaped positioning sleeve is horizontally arranged on the side opposite to the cantilever of the auxiliary positioning hoop and the cantilever capping beam. A pull rod is vertically penetrated in the T-shaped positioning sleeve. The bottom end of the pull rod is fixedly connected to the foundation at the bottom of the pipe pile, and the top end penetrates through the cantilever capping beam and is connected with a through jack, and the through jack is used for the bracketless reverse pulling installation of the cantilever capping beam.

[0014] Preferably, a transverse wet joint section and a longitudinal wet joint section are reserved between adjacent precast π beams; lengthened limit brackets are vertically arranged on both sides of the transverse wet joint section, and the lengthened limit brackets are installed on the near point connection bases of the extended platform. Special-shaped templates are installed on both sides of the transverse wet joint section. Connecting corbels are installed on the top of the lengthened limit brackets, and the connecting corbels and the special-shaped templates are fixedly connected; the special-shaped template is integrally in a C-shaped structure, the web corresponds to the cross-section gap between adjacent precast π beams, and connecting bolts are arranged on the bottom plate of the special-shaped template for fixedly connecting with the connecting corbels.

[0015] Preferably, a longitudinal bottom form is installed at the bottom end of the suspension rod, and the longitudinal bottom form is arranged below the longitudinal wet joint section.

[0016] The beneficial effects of the present utility model are as follows:

[0017] 1) By providing an extended platform based on a temporary hoop on the top of the precast pipe pile, the present utility model forms a temporary auxiliary positioning support system for completing the core filling operation at the top of the pipe pile, and adds a limit bracket and a lifting alignment device to improve the installation accuracy of the precast capping beam, effectively ensuring the construction quality.

[0018] 2) For the precast capping beam with a left-middle-right segmented structure, the present utility model installs a hanging beam and a hanging rod structure in the middle section of the precast capping beam that has been installed to support the bottom of the left and right sections of the precast capping beam, effectively ensuring the installation accuracy and construction safety of the left and right sections of the precast capping beam. And for the cantilever capping beam, a bracketless back-pulling system is set up to further improve the construction efficiency and construction safety.

[0019] 3) The present utility model solves the formwork support problem for the transverse wet connection section of the precast π-beam by installing a special-shaped formwork, and uses an extended platform for the formwork support of the special-shaped formwork. The formwork support problem for the longitudinal wet connection section of the precast π-beam is solved by reusing the hanging rod and bottom support beam structure, effectively ensuring the construction quality of the wet connection post-cast belt of the precast π-beam. Brief Description of the Drawings

[0020] Figure 1 is a schematic diagram of the temporary hoop structure;

[0021] Figure 2 is a schematic diagram of the installation of the temporary hoop;

[0022] Figure 3 is a schematic diagram of the extended platform structure;

[0023] Figure 4 is a schematic diagram of the auxiliary installation of the sliding lift;

[0024] Figure 5 is a schematic diagram of the installation of the limit bracket;

[0025] Figure 6 is a schematic diagram of the installation of the jacking alignment device;

[0026] Figure 7 is a schematic diagram of the installation of the cantilever capping beam;

[0027] Figure 8 is a schematic diagram of the installation of the segmented capping beam;

[0028] Figure 9 is a top view of the installation of the precast π-beam;

[0029] Figure 10 is Figure 9 the A-A sectional view in

[0030] Figure 11 is Figure 9 the B-B sectional view in

[0031] Figure 12 is a side view of the installation of the special-shaped formwork;

[0032] Figure 13 is a sectional view of the installation of the special-shaped formwork;

[0033] Figure 14 is a schematic diagram of the special-shaped formwork structure.

[0034] In the figure: 1-temporary clamp web; 2-end plate connection hole; 3-anchor bolt; 4-temporary clamp; 5-core steel cage; 6-pile end plate; 7-extension platform; 8-near point connection base; 9-far point connection base; 10-slide rail; 11-limit bracket; 12-dense mesh; 13-pile; 14-hydraulic support rod; 15-ladder; 16-blocking end plate; 17-extension platform connection hole; 18-prefabricated cap beam; 19-jacking positioner; 20-concrete core; 21-pulley; 22-hook; 23-traction rope; 24-winch; 25-foundation; 26-sliding auxiliary bracket; 27- Through-hole jack; 28-upper section of tie rod; 29-cantilever cap beam; 30-connecting sleeve; 31-T-shaped positioning sleeve; 32-middle section of tie rod; 33-foundation counter-tensioning bar; 34-auxiliary positioning clamp; 35-suspender rod; 36-auxiliary connecting piece; 37-suspender beam; 38-cap beam wet joint section; 39-bottom supporting beam; 40-lateral stabilizer bar; 41-prefabricated π beam; 42-support; 43-special-shaped formwork; 44-extended limit bracket; 45-lateral wet joint section; 46-prefabricated π beam surface layer; 47-prefabricated guardrail; 48-longitudinal bottom formwork; 49-connecting corbel; 50-connecting bolt; 51-longitudinal wet joint section. DETAILED DESCRIPTION

[0035] The utility model is further described below in conjunction with the embodiments. The description of the following embodiments is only used to help understand the utility model. It should be pointed out that for ordinary people in the technical field, the utility model can also be modified in some ways without departing from the principle of the utility model, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0036] Embodiment 1

[0037] As an example, Figures 1 to 14 As shown, this fully prefabricated prestressed π beam pile slab bridge construction system includes an expansion platform 7; the expansion platform 7 is fixed on the pipe pile 13 through a temporary clamp 4, and is used to assist the hoisting of the prefabricated cap beam 18 and the wet joint formwork between the prefabricated π beams 41;

[0038] like Figure 4 As shown, a sliding auxiliary bracket 26 is symmetrically embedded on the pipe wall at the top of the pipe pile 13, and a pulley 21 is provided at the end of the sliding auxiliary bracket 26; a winch 24 is provided on the foundation 25 at the bottom of the pipe pile 13, and the traction rope 23 of the winch 24 is connected to the temporary clamp 4 of the winch 24 through the pulley 21, which is used to pull up the temporary clamp 4; a ladder 15 is installed on the pipe pile 13 in the height direction.

[0039] like Figures 1 to 3As shown in the figure, end plate connection holes 2 are provided on the temporary hoop web 1 of the temporary hoop 4. The extended platform 7 is provided with extended platform connection holes 17 corresponding to the end plate connection holes 2. The temporary hoop 4 is connected and fixed to the extended platform 7 through the end plate connection holes 2 and the extended platform connection holes 17. Hydraulic struts 14 are provided on both sides of the temporary hoop 4, and the hydraulic struts 14 are connected to the bottom surface of the extended platform 7.

[0040] The extended platform 7 is composed of two groups of semi-circular structures that are symmetrical left and right. The top surface of a single extended platform 7 is provided with a slide rail 10, a far point connection base 9, and a near point connection base 8;

[0041] As Figure 5 and Figure 6 shown in the figure, when hoisting the precast capping beam 18, a limit bracket 11 and a jacking alignment device 19 are provided on the extended platform 7; the far point connection base 9 and the near point connection base 8 are used to install the limit bracket 11, and the jacking alignment device 19 is installed on the slide rail 10 for the positioning of the precast capping beam 18.

[0042] Embodiment 2

[0043] As another embodiment, this Embodiment 2 is proposed on the basis of Embodiment 1, and a more specific construction system for a fully precast assembled pretensioned prestressed π-beam pile slab bridge:

[0044] As Figure 8 shown in the figure, the precast capping beam 18 is a left-middle-right segmented structure. The middle section of the precast capping beam 18 is placed on the top of the pipe pile 13. An auxiliary lifting beam 37 is installed on the middle section of the precast capping beam 18. The auxiliary lifting beam 37 extends horizontally to the left and right sides of the middle section of the precast capping beam 18. The auxiliary lifting beam 37 is connected to the precast capping beam 18 through an auxiliary connecting piece 36. Suspension rods 35 are provided on both sides of the auxiliary lifting beam 37, and a bottom supporting beam 39 is provided at the bottom of the suspension rods 35 for supporting the left and right sections of the precast capping beam 18.

[0045] As Figure 7 shown in the figure, the precast capping beam 18 is a cantilever capping beam 29. An auxiliary positioning hoop 34 is provided on the pipe pile 13 below the cantilever capping beam 29. A T-shaped positioning sleeve 31 is horizontally arranged on the side opposite to the cantilever of the auxiliary positioning hoop 34 and the cantilever capping beam 29. A pull rod is vertically penetrated in the T-shaped positioning sleeve 31. The bottom end of the pull rod is fixedly connected to the foundation 25 at the bottom of the pipe pile 13, and the top end penetrates through the cantilever capping beam 29 and is connected with a through-hole jack 27. The through-hole jack 27 is used for the scaffold-free reverse tension installation of the cantilever capping beam 29.

[0046] As Figures 9 to 13 shown in the figure, a transverse wet joint section 45 and a longitudinal wet joint section 51 are reserved between adjacent precast π-beams 41; precast π-beams 41 are provided above two adjacent precast capping beams 18 front and back. When pouring the wet joint between the precast π-beams 41, a special-shaped formwork 43 is installed at the transverse wet joint section 45 between the precast π-beams 41.

[0047] On both sides of the transverse wet joint section 45, lengthened limiting brackets 44 are vertically provided. The lengthened limiting brackets 44 are installed on the near-point connection base 8 of the extended platform 7. Special-shaped templates 43 are installed on both sides of the transverse wet joint section 45. A connecting corbel 49 is installed at the top of the lengthened limiting bracket 44, and the connecting corbel 49 is fixedly connected to the special-shaped template 43; as Figure 14 shown, the overall shape of the special-shaped template 43 is a C-shaped structure, and the cross-section of the gap between the web and the adjacent precast π-beam 41 corresponds. The bottom plate of the special-shaped template 43 is provided with connecting bolts 50 for fixedly connecting to the connecting corbel 49.

[0048] As Figure 13 shown, a longitudinal bottom form 48 is installed at the bottom end of the suspender 35, and the longitudinal bottom form 48 is arranged below the longitudinal wet joint section 51.

[0049] It should be noted that the parts that are the same as or similar to those in the first embodiment in this embodiment can be referred to each other, and will not be described in detail in this application.

[0050] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

Claims

1. A fully prefabricated pre-tensioned prestressed π-beam pile slab bridge construction system, characterized in that, It includes an extended platform; the extended platform is fixed on the pipe pile through a temporary hoop and is used to assist in the hoisting of precast capping beams and formwork support for the wet joints between precast π-beams. When hoisting the precast capping beam, a limit support and a jacking alignment device are provided on the extended platform. Precast π-beams are provided above adjacent precast capping beams before and after. When pouring the wet joints between the precast π-beams, special-shaped formwork is installed at the transverse wet joint section between the precast π-beams.

2. The full prefabricated pretensioned prestressed π-beam pile slab bridge construction system according to claim 1, wherein, Sliding auxiliary supports are symmetrically embedded on the pipe wall at the top of the pipe pile, and pulleys are arranged at the ends of the sliding auxiliary supports; a winch is arranged on the foundation at the bottom of the pipe pile, and the traction rope of the winch is connected to the temporary hoop of the winch through the pulley for lifting the temporary hoop; a ladder is installed on the pipe pile along the height direction.

3. The full prefabricated pretensioned prestressed π-beam pile slab bridge construction system according to claim 1, wherein End plate connection holes are provided on the web of the temporary hoop of the temporary hoop, and extended platform connection holes are provided on the extended platform corresponding to the end plate connection holes. The temporary hoop is connected and fixed to the extended platform through the end plate connection holes and the extended platform connection holes, and hydraulic struts are arranged on both sides of the temporary hoop and are connected to the bottom surface of the extended platform.

4. The full precast pre-tensioned prestressed π-beam pile slab bridge construction system according to claim 1, wherein The extended platform is composed of two groups of semi-circular structures that are symmetrical left and right. The top surface of a single extended platform is provided with a slide rail, a far point connection base, and a near point connection base; the far point connection base and the near point connection base are used to install the limit support, and the jacking alignment device is installed on the slide rail for the positioning of the precast capping beam.

5. The full prefabricated pretensioned prestressed π-beam pile slab bridge construction system according to claim 1, wherein The precast capping beam is a left-middle-right segmented structure. The middle section of the precast capping beam is placed on the top of the pipe pile, and an auxiliary lifting beam is installed on the middle section of the precast capping beam. The auxiliary lifting beam extends horizontally to the left and right sides of the middle section of the precast capping beam. The auxiliary lifting beam is connected to the precast capping beam through an auxiliary connecting piece, and suspension rods are arranged on both sides of the auxiliary lifting beam. A bottom support beam is arranged at the bottom of the suspension rod for supporting the left and right sections of the precast capping beam.

6. The full prefabricated pretensioned prestressed π-beam pile slab bridge construction system according to claim 1, wherein, The precast capping beam is a cantilever capping beam. An auxiliary positioning hoop is arranged on the pipe pile below the cantilever capping beam. A T-shaped positioning sleeve is horizontally arranged on the side opposite to the cantilever of the auxiliary positioning hoop and the cantilever capping beam. A pull rod is vertically penetrated in the T-shaped positioning sleeve. The bottom end of the pull rod is fixedly connected to the foundation at the bottom of the pipe pile, and the top end penetrates through the cantilever capping beam and is connected with a through jack, and the through jack is used for the bracketless back-pulling installation of the cantilever capping beam.

7. The full prefabricated pre-tensioned prestressed π-beam pile slab bridge construction system according to claim 4, characterized in that, A transverse wet joint section and a longitudinal wet joint section are reserved between adjacent precast π-beams; extended limit supports are vertically arranged on both sides of the transverse wet joint section respectively. The extended limit supports are installed on the near point connection bases of the extended platform. Special-shaped formwork is installed on both sides of the transverse wet joint section. Connection brackets are installed at the top of the extended limit supports, and the connection brackets are fixedly connected with the special-shaped formwork; the special-shaped formwork is integrally in a C-shaped structure, and the web corresponds to the cross-section of the gap between adjacent precast π-beams. Connection bolts are arranged on the bottom plate of the special-shaped formwork for fixedly connecting with the connection brackets.

8. The full prefabricated pretensioned prestressed π-beam pile slab bridge construction system according to claim 5, characterized in that, A longitudinal bottom form is installed at the bottom end of the suspension rod, and the longitudinal bottom form is arranged below the longitudinal wet joint section.

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