Truss supporting system suitable for large-angle inclined-leg V-shaped pier No.0 block pouring

Abstract

The utility model discloses a truss supporting system suitable for large-angle inclined-leg V-shaped pier No.0 block pouring, and belongs to the technical field of bridge structure construction. The force transmission component comprises a plane force transmission component and a vertical force transmission component; the plane force transmission component comprises a bailey beam truss, and the vertical force transmission component comprises a floor steel pipe support, a bracket and a side mold bracket. The floor steel pipe support is a pipe pile support on a main pier of the V-shaped pier, the bracket and the side mold bracket are both arranged on the V-shaped pier, and the top of a steel pipe pile in the floor steel pipe support and the top of the bracket are each provided with a set of pile top distribution beams and a set of bracket distribution beams; the group of pile top distribution beams, the bracket distribution beams and the side mold brackets are combined to form a supporting structure, and the bailey beam trusses are arranged on the supporting structure. The construction structure is stable, construction is convenient, the space of the pier beam bottom is effectively saved, only the embedded parts need to be additionally arranged at the local position of the V-shaped pier top, and damage to the surface of the pier is reduced; the whole supporting system is safe, reliable, small in occupied space and capable of improving construction efficiency and effectively reducing cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge structure construction, and in particular relates to a truss support system suitable for casting No. 0 blocks of V-shaped piers with large angle slanted legs. Background Art

[0002] Prestressed concrete V-shaped pier continuous rigid frame bridges, due to their excellent mechanical properties, can effectively reduce the bending moment of the main beam and shorten the calculated span, thereby reducing the engineering workload of the bridge superstructure and improving the bridge's overall span capacity. Furthermore, the V-shaped slanted leg piers are lightweight and aesthetically pleasing compared to traditional piers, enhancing the bridge's landscape and adding to the city's cultural atmosphere and landmark status. Therefore, large-angle V-shaped piers are widely used in urban bridges, viaducts, and overpasses.

[0003] Currently, for the casting construction of the No. 0 block beam section on the upper part of a large-angle V-shaped bridge pier, the common practice both domestically and internationally is to erect a full-frame scaffold at the bottom of the pier beam and then install the No. 0 block formwork for casting; or to design the No. 0 block and the V-shaped pier as a whole and cast them together; or to install multiple embedded parts on the V-shaped pier body and fix the support system of the No. 0 block formwork to the embedded parts on the inner wall of the V-shaped pier body. However, these methods have certain drawbacks. For example, erecting a full-frame scaffold is time-consuming and labor-intensive, and requires sufficient space to be reserved at the bottom of the pier; the initial construction cost of the coordinated design of the No. 0 block and the V-shaped pier is high, and the construction site operations are difficult to control; and the installation of fixed scaffolds on the pier body is prone to secondary damage to the pier, requiring a large amount of repair work in the later stage. For this reason, a method for casting the No. 0 block on the upper part of a large-angle V-shaped pier with a limited construction area is proposed. Utility Model Content

[0004] In response to the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a truss support system suitable for casting No. 0 blocks of V-shaped piers with large angle slanted legs, which can control costs and minimize damage to the pier body without occupying the bottom space of the slanted leg sides.

[0005] The utility model provides the following technical solutions: a truss support system suitable for casting No. 0 blocks of large-angle inclined-leg V-shaped piers, comprising a planar force-transmitting component and a vertical force-transmitting component; the planar force-transmitting component comprises a Bailey beam truss, and the vertical force-transmitting component comprises a ground-mounted steel pipe bracket, a corbel and a side formwork bracket; the ground-mounted steel pipe bracket is a pipe pile bracket on the main pier of the V-shaped pier, and the corbel and the side formwork bracket are both arranged on the V-shaped pier, and the tops of the steel pipe piles and corbels in the ground-mounted steel pipe bracket are respectively provided with a group of pile top distribution beams and corbel distribution beams; a group of pile top distribution beams, corbel distribution beams and side formwork brackets are combined to form a support structure, and the Bailey beam truss is arranged on the support structure.

[0006] Furthermore, a pile cap is installed on the top of the steel pipe pile in the ground-mounted steel pipe support, and a group of reinforcing steel plates are provided inside the top, and annular flange reinforcing steel plates are provided between the reinforcing steel plates.

[0007] Furthermore, the pile top distribution beam is a steel box beam, which is fixed on the pile caps on the top of a group of steel pipe piles.

[0008] Furthermore, the corbel is arranged on the inner side of the V-shaped pier, and is connected to the corbel embedded parts embedded in the V-shaped pier; the side formwork bracket is arranged on the side of the V-shaped pier, and includes 2 groups of triangular brackets, which are connected by diagonal braces and vertical I-beams, and the side formwork bracket is connected to the side formwork bracket embedded parts embedded in the V-shaped pier.

[0009] Furthermore, a group of I-beam distribution beams are provided on the Bailey beam truss, and a disc-type full-hall bracket is installed on the I-beam distribution beam.

[0010] Furthermore, it also includes a Bailey truss support top surface working platform, block No. 0 bottom plate formwork working platform, block No. 0 bottom plate top working platform and block No. 0 top plate bottom working platform; the Bailey truss support top surface working platform and the block No. 0 bottom plate formwork working platform are provided with guardrails on both sides, and the guardrails are fixed on the I-beam distribution beam; anti-fall nets are hung between each horizontally arranged distribution beam, and the anti-fall nets are fixed to the distribution beam by wire binding, and the end of the wire is arranged toward the I-beam web in the I-beam distribution beam; the No. 0 block bottom plate top working platform uses web steel bars as guardrails; the No. 0 block top plate bottom working platform is provided with guardrails on the outer side of the wing plate.

[0011] By adopting the above technology, compared with the existing technology, the beneficial effects of the present invention are as follows:

[0012] 1) The construction structure of this new type of bridge is stable and easy to construct. The formwork of the upper block 0 is erected with the help of the ground-mounted steel pipe bracket constructed with the inclined legs of the V-shaped pier as the main load-bearing structure, which effectively saves space at the bottom of the pier and beam. Only embedded parts need to be added locally at the top of the V-shaped pier, reducing damage to the pier surface. The entire support system is safe and reliable, occupies a small area, can improve construction efficiency, and effectively reduce costs.

[0013] 2) The support system of this utility model occupies a small area, only occupying the V-shaped pier cap area, and can be used in construction near water areas, with a wide range of applications;

[0014] 3) The support system of this utility model does not need to set up a large-area integral ground support. The support can be completed only by the ground steel pipe used for the construction of the V-shaped pier, which saves materials and has high comprehensive benefits.

[0015] 4) The support system of the utility model does not damage the surface of the pier body, has fewer embedded parts, is low in cost, and reduces secondary damage to the pier body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view structural diagram of the No. 0 block construction support system of the present utility model;

[0017] Figure 2 This is a side structural diagram of the construction support system of block 0 of the mid-span cross-section of the present invention;

[0018] Figure 3 This is a side structural diagram of the construction support system of block 0 of the beam end cross section of the utility model;

[0019] Figure 4 This is a top view structural diagram of the No. 0 block construction support system of the utility model;

[0020] Figure 5 This is a large-scale drawing of the pile cap structure of the ground-mounted steel pipe support of the present invention; 5a is a schematic diagram of the installation structure of the reinforcing steel plate, 5b is a schematic diagram of the installation structure of the annular flange reinforcing steel plate, and 5c is a schematic diagram of the installation structure of the pile cap;

[0021] Figure 6 6a is a schematic diagram of the front view of the side mold bracket, and 6b is a schematic diagram of the side mold bracket;

[0022] Figure 7 7a is a schematic diagram of the front view of the pile top distribution beam, 7b is a schematic diagram of the side view of the pile top distribution beam at the pile section, and 7c is a schematic diagram of the side view of the pile top distribution beam at the inter-pile section.

[0023] Figure 8 This is a large-scale drawing of the Bailey beam truss of the present invention; among them, 8a is a front view structural diagram of the clamp, 8b is a side view of the clamp, and 8c is a structural diagram of the reinforcing vertical rod.

[0024] In the figure: 1-V-shaped pier, 2-Block No. 0, 3-Ground-type steel pipe support, 4-Bailey beam truss, 5-Corbel, 6-Side formwork bracket, 7-Pile top distribution beam, 8-Corbel upper distribution beam, 9-I-beam distribution beam, 10-Full-floor support, 11-Side formwork truss, 12-Reinforced steel plate, 13-Annular flange reinforcement steel plate, 14-Pile cap, 15-Corbel embedded parts, 16-Side formwork bracket embedded parts, 17-Guardrail. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] Rather, the present invention encompasses any alternatives, modifications, equivalents, and solutions within the spirit and scope of the present invention as defined by the claims. Furthermore, to facilitate a better understanding of the present invention, certain specific details are detailed below in the detailed description of the present invention. Those skilled in the art will be able to fully understand the present invention without these details.

[0027] See also Figures 1 to 4 As shown, a truss support system suitable for casting the No. 0 block of a large-angle, slanted-leg V-shaped pier is constructed using a Bailey beam truss 4 as the planar force transmission component for the No. 0 block. The floor-mounted steel pipe supports 3, the corbels 5 installed on the V-shaped pier columns, and the side formwork brackets 6 serve as the vertical force transmission components for the No. 0 block. The corbels 5 and side formwork brackets 6 serve as the side support points for the Bailey beam truss 4, while the floor-mounted steel pipe supports 3 replicate the pipe pile supports used in V-shaped pier construction.

[0028] The No. 0 beam section is poured in three times. The specific steps are as follows:

[0029] S1. Design and determine the specific installation positions of the corbel 5 and the side formwork bracket 6 on the pier body, and perform installation operations;

[0030] S2. After the concrete pouring of the last section of the V-shaped pier is completed and the concrete reaches the specified strength, all side formwork support systems of the V-shaped main pier are dismantled, the constraints of all side formwork on the steel pipe pile columns in the pipe pile supports are released, and the excess steel pipe pile columns are cut off to reduce their height to the design elevation;

[0031] S3, install the pile top distribution beam 7 of the steel pipe pile top and the corbel distribution beam 8 on the corbel, fully weld the pile top distribution beam 7, the corbel distribution beam 8 to the pipe pile top and the corbel 5, then install the Bailey beam truss 4, install the I-beam distribution beam 9 on the Bailey beam truss 4, and then install the disc buckle full-height bracket 10;

[0032] S4. Install the side formwork truss 11 of block 0 and start pouring concrete for block 0. The first concrete pouring is to the bottom plate position, the second concrete pouring position is from the web of block 0 to the lower chamfer of the top plate, and the third concrete pouring position is the top plate and flange of block 0.

[0033] The specific structure of the support system for the casting of Block 0 of the large-angle V-shaped pier is as follows:

[0034] 1) After the ground steel pipe support is erected, the top of the steel pipe needs to be reinforced. See Figure 5 , the steel pipe is internally welded with a reinforcement steel plate 12, and an annular flange reinforcement steel plate 13 is set between the reinforcement plates, and then the pile cap 14 is welded;

[0035] 2) For large-angle V-shaped piers, a corbel 5 is installed inward on the transverse bridge, and a side formwork bracket 6 is installed on the side of the transverse bridge. The side formwork bracket 6 is composed of two sets of triangular brackets connected to each other. The base of the triangular bracket is connected to the vertical I-beam through two diagonal braces. For details, please refer to Figure 6 The corbel 5 and the side formwork bracket 6 are equipped with corresponding welded embedded parts. The corbel embedded parts 15 and the side formwork bracket embedded parts 16 are embedded during the construction of the last section of the V-shaped pier.

[0036] 3) See Figure 7 , install the pile top distribution beam 7 on each row of steel pipe piles in the transverse direction of the V-shaped pier. The pile top distribution beam 7 adopts a steel box beam and is hoisted as a whole onto the steel pipe pile cap 14 after on-site assembly. After checking the position and elevation, the bottom plate and the pile cap steel plate are welded.

[0037] 4) See Figure 8 , install the Bailey beam truss 4 on the distribution beam of the pile top, corbel 5 and side formwork bracket 6, use channel steel to reinforce the Bailey beam truss 4 to form an integral structure, install the I-beam distribution beam on the Bailey beam truss 5, and serve as the steel pipe pad of the full-span bracket 10 for the box beam bottom plate. The full-span bracket 10 adopts a disc-type steel pipe bracket, and the selection of fasteners is carried out in accordance with the provisions of the "Safety Technical Standard for Socket-Type Disc-Type Steel Pipe Scaffolding in Construction" (JGJ / T231-2021). The longitudinal spacing of the standard section of the full-span bracket 10 is arranged according to the spacing of the distribution beams, and the brackets under the web are set densely.

[0038] The construction of Block 50 requires the establishment of a working platform. The top surface of the Bailey truss support can be used as the first-level working platform, upon which a full-height frame can be erected. The second, third, and fourth-level working platforms will use the Block 0 bottom plate formwork, bottom plate top, and top plate bottom, respectively. Guardrails 17 will be installed on both sides of the first and second-level platforms, web reinforcement will be used as guardrails on the third-level platform, and railings will be installed on the outer sides of the wing plates on the fourth-level platform.

[0039] Example:

[0040] like Figures 1 to 4 As shown, block No. 0 is 48 meters long and weighs 5257.5 tons. It is cast in three times. The overall solution adopts ground steel pipe support 3 and Bailey beam truss 4 for construction. Corbel 5 is set on the pier as the side support point. The side formwork platform of block No. 0 is arranged with the side formwork bracket 6 embedded in the pier.

[0041] During the three pouring construction of Block 0, the ground steel pipe support will use the pipe pile support used in the main pier construction. The pile top needs to be processed: that is, after the V-shaped pier is constructed, all the main pier side formwork trusses will be removed, and all constraints on the pipe piles will be released; the top of the steel pipe pile column in the pipe pile support needs to be cut off to reduce its height to the design elevation, and the pile top needs to be leveled and reinforced. Figure 5As shown, at the locations where the stress of the four pipe piles at the four corners is greater, within a range of 1.5 meters below the pile top, six reinforcing steel plates 12 with a length of 1500 mm, a width of 200 mm, and a thickness of 20 mm need to be welded; three circumferential flange reinforcing steel plates 13 with a width of not less than 200 mm are set between the reinforcing steel plates, with a vertical spacing of 500 mm; then, the pile cap 14 is welded. The pile cap is made of 1400×1400×20 mm steel plate and is welded to the steel pipe piles and the reinforcing steel plates 12.

[0042] On the inside of the large-angle V-shaped pier, three sets of corbels were installed according to the designed position, for a total of six sets. On the lateral sides of the V-shaped pier, one set of brackets was installed, for a total of four sets. These brackets were welded to the embedded steel plates of the brackets according to the designed position. The corbel embedded parts 15 on the front of the V-shaped pier were pre-buried during the construction of the last section of the V-shaped pier. Each embedded part measured 1400×800×20mm steel plate and was connected to the main pier reinforcement through 20 pieces of 400×50×20mm steel plates. Before the construction of block 0, the corbel steel plates were welded. The top steel plate was a 740×700×20mm steel plate. It was leveled by welding three straight triangles with right-angled sides of 900mm high and 20mm thick steel plates to the embedded parts. At the same time, a horizontal reinforcement rib was welded to the middle of the vertical triangle steel plate to improve the overall stability of the corbel.

[0043] like Figure 6 As shown, the side formwork bracket embedded parts 16 are pre-embedded into the steel plates during the V-shaped pier construction phase. Four steel plates measuring 400×400×20mm are embedded at each location. 32mm diameter screws are used for connection, with six 600mm long screws embedded in each steel plate. The horizontal center spacing between the steel plates is 1535mm, and the vertical spacing is 1235mm. Each side formwork bracket 6 is interconnected by two sets of triangular brackets. These triangular brackets are welded from double-jointed I20a I-beams. The top I-beam of the bracket is 2798mm long, and the lower diagonal brace in the triangular bracket is supported at 2023mm from the top I-beam. A 16# channel steel is welded to the bottom and support of the top I-beam of the two sets of brackets, while the lower diagonal brace is welded to the top of the 16# channel steel. Furthermore, the vertical I-beams at the base of the two sets of triangular brackets are connected by two diagonal braces.

[0044] Install the pile top distribution beam 7 and the distribution beam 8 on the bracket, fully weld the corresponding distribution beam to the pipe pile top and the bracket, then install the Bailey beam truss 4, install the I-beam distribution beam 9 on the Bailey beam truss 4, and install the disc buckle full-height bracket 10 on the distribution beam. Figure 7As shown, the pile top distribution beam 7 adopts a steel box beam with a height of 1.5m, the top and bottom plates adopt steel plates with a thickness of 30mm, and the web adopts steel plates with a thickness of 16mm. The various components are connected by fillet welding, and the webs are reinforced with trapezoidal stiffeners on both sides. One stiffener is set every 1.3m between steel pipe piles, and four vertical stiffeners and one transverse stiffener are set on the top of the steel pipe piles. After the steel box beam is assembled on site, it is hoisted as a whole onto the pile cap of the steel pipe pile. After checking the position and elevation, the bottom plate and the pile cap steel plate are welded. One steel box beam is installed on each row of steel pipe piles in the transverse bridge. Double-piece HN800×300 steel sections are placed on the inner corbel of the V-shaped pier, and the steel sections are fastened with four sets of tension screws to prevent overturning.

[0045] like Figure 8 As shown, the Bailey beam truss 4 utilizes a 321-type Bailey beam, with a total of 29 beams under each No. 0 block. Three beams are arranged at each flange area on both sides, with a spacing of 90 cm. Six beams are arranged under each web plate, and 11 beams are arranged under the bottom plate. The Bailey beam reinforcement utilizes 10# and double-jointed 16# channel steel welded together to form a single piece according to the designed position. Furthermore, an I20a I-beam distribution beam 9 is installed on the Bailey beam as a full-height support steel pipe pad for the box girder bottom plate.

[0046] The full-height bracket 10 uses a disc-type steel pipe bracket. The steel pipe specification is Φ48×3.5mm, with an inner diameter of 41mm. The end cut of the steel pipe should be flat. The fasteners are selected in accordance with the "Safety Technical Standard for Socket-type Disc-type Steel Pipe Scaffolding in Construction" (JGJ / T231-2021).

[0047] The standard longitudinal spacing of 10 full-bridge supports is based on the spacing of the distribution beams, with a standard spacing of 0.5m in the transverse direction. The supports under the webs should be intensified, with a transverse span of 0.25m, and five supports arranged transversely under each web. All 10 full-bridge supports have a step spacing of 1.2m, and the height of the free end at the top is 0.5m. A top support is used to adjust the bottom elevation of the formwork at the top of the scaffolding. A 10# channel steel is placed longitudinally on the top support, and 10×10cm square timber and 14mm thick bamboo plywood are placed on the channel steel. The timbers are placed at 20cm intervals between the middle beams and 10cm intervals at the end beams.

[0048] A total of four working platforms were erected for Block 0 construction. The first layer was the Bailey beam top, used to set up the full-height scaffolding. The second layer served as the Block 0 bottom slab formwork. The third layer served as the bottom slab top. The fourth layer served as the bottom slab bottom formwork for Block 0. 1.2m guardrails 17 were installed on both sides of the first and second-level platforms. These railings were securely welded to transverse I20a I-beams and could withstand a 1000N horizontal impact force. Anti-fall nets were suspended between the transverse distribution beams and secured to each distribution beam with wire lashings, with the ends of the wires pointing toward the I-beam webs. The third-level platform used web reinforcement as guardrails, and the fourth-level platform had railings installed outside the wing panels.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A truss support system suitable for casting No. 0 blocks of large-angle slanted legs V-shaped piers, characterized in that: The invention comprises a planar force transmission component and a vertical force transmission component; the planar force transmission component comprises a Bailey beam truss (4); the vertical force transmission component comprises a ground steel pipe support (3), a corbel (5) and a side form bracket (6); the ground steel pipe support (3) is a pipe pile support on the main pier of a V-shaped pier; the corbel (5) and the side form bracket (6) are both arranged on the V-shaped pier; the tops of the steel pipe piles and the corbel (5) in the ground steel pipe support (3) are respectively provided with a group of pile top distribution beams (7) and corbel distribution beams (8); the group of pile top distribution beams (7), the corbel distribution beams (8) and the side form bracket (6) are combined to form a support structure; the Bailey beam truss (4) is arranged on the support structure.

2. A truss support system suitable for casting block 0 of a large-angle slanted-leg V-shaped pier according to claim 1, characterized in that: A pile cap (14) is installed on the top of the steel pipe pile in the grounded steel pipe support (3), a group of reinforcing steel plates (12) are provided inside the top, and an annular flange reinforcing steel plates (13) are provided between the reinforcing steel plates (12).

3. A truss support system suitable for casting block 0 of a large-angle slanted-leg V-shaped pier according to claim 2, characterized in that: The pile top distribution beam (7) is a steel box beam, which is fixed on the pile cap (14) on the top of a group of steel pipe piles.

4. A truss support system suitable for casting No. 0 block of a large-angle slanted leg V-shaped pier according to claim 1 or 3, characterized in that: The corbel (5) is arranged on the inner side of the V-shaped pier in the transverse direction and is connected to the corbel embedded part (15) embedded in the V-shaped pier; the side form bracket (6) is arranged on the side of the V-shaped pier in the transverse direction and includes two groups of triangular brackets, which are connected through diagonal braces and vertical I-beams, and the side form bracket (6) is connected to the side form bracket embedded part (16) embedded in the V-shaped pier.

5. The truss support system suitable for casting block 0 of large-angle slanted-leg V-shaped pier according to claim 1 is characterized in that: A group of I-beam distribution beams (9) are provided on the Bailey beam truss (4), and a disc-type full-height bracket (10) is installed on the I-beam distribution beam (9).

6. A truss support system suitable for casting No. 0 block of a large-angle slanted leg V-shaped pier according to claim 1, characterized in that: The invention also includes a Bailey truss support top surface working platform, a No. 0 block bottom plate template working platform, a No. 0 block bottom plate top working platform and a No. 0 block top plate bottom working platform; guardrails (17) are provided on both sides of the Bailey truss support top surface working platform and the No. 0 block bottom plate template working platform, and the guardrails (17) are fixed on the I-beam distribution beam (9); an anti-falling net is hung between each of the horizontally arranged distribution beams, and the anti-falling net is fixed to the distribution beam by iron wire binding, and the end of the iron wire is arranged toward the I-beam web in the I-beam distribution beam (9); the No. 0 block bottom plate top working platform uses web steel bars as guardrails; and a railing is provided on the outer side of the wing plate of the No. 0 block top plate bottom working platform.

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