Bilateral rib plate type girder template device of concrete cable-stayed bridge

Abstract

The utility model discloses a concrete cable-stayed bridge bilateral rib plate type main beam template device which comprises a main beam top plate, a plurality of transverse partition beams are arranged in the middle of the main beam top plate at intervals, main beam side ribs are connected to the two ends of the main beam top plate, main beam flange plates are connected to the two ends of the main beam top plate, and the side edges of the two main beam flange plates are connected with the main beam side ribs. The side, away from the main beam top plate, of each main beam side rib is connected with a stay cable anchoring block, the two stay cable anchoring blocks are connected with stay cables, a front fulcrum hanging basket is arranged at the bottom of the main beam top plate and the bottom of the diaphragm, the front fulcrum hanging basket is connected with a formwork system, and the formwork system is matched with the main beam top plate and the diaphragm. The overall descending height of the hanging basket is small, the hanging basket can be safely and efficiently lifted and placed, a bilateral main rib and a side mold of a diaphragm beam are fixed to the hanging basket, a turnover mold erecting / demolding mode is adopted, top plate bottom mold descending construction and tension preparation operation are conducted in parallel, and the construction period of a beam section is not occupied.

Description

Technical Field

[0001] This utility model belongs to the technical field of bridge casting auxiliary systems, specifically relating to a double-ribbed main beam formwork device for concrete cable-stayed bridges. Background Technology

[0002] Cable-stayed bridges, also known as axial-tensioned bridges, are a type of composite bridge system where the main girder is directly anchored to towers using numerous cable stays. They are structural systems composed of compression-bearing towers, tension-bearing cables, and bending-bearing beams, and can be viewed as multi-span elastically supported continuous beams where cables replace piers. This arrangement reduces bending moments within the beam, lowers the building height, reduces structural mass, and saves materials. As a cable-stayed system, cable-stayed bridges have a greater span capacity than beam bridges and are the main type of long-span bridge. The main girder of a cable-stayed bridge can be classified into four main categories according to its material structure: concrete main girder, steel main girder, steel-concrete composite (stacked) beam, and steel-concrete hybrid beam.

[0003] Although concrete cable-stayed bridges have a smaller span capacity and slower construction speed compared to steel main beams, they offer advantages such as lower cost, simpler maintenance, higher stiffness, lower deflection, and better wind resistance, making them the preferred bridge type for main spans ranging from 200m to 500m. For double-cable-stayed bridges, the double-ribbed main beam section is convenient to construct due to its simple structure and the ability to use front-support formwork for cantilever casting.

[0004] When using the cantilever casting construction technique with front-support formwork for the main girder of a concrete cable-stayed bridge, after the completion of one main girder segment, the formwork needs to be moved forward to the next segment for continued construction. Before moving the formwork forward, the formwork must be removed and lowered below the bottom of the main girder's transverse diaphragms to facilitate the move to the next segment. The lowering height of the formwork must be determined based on the formwork system. Due to the large area of ​​the formwork, numerous support frames, and limited working space, formwork removal and installation require a considerable amount of time. Therefore, the removal and installation of formwork directly impacts the construction period of a main girder segment. Utility Model Content

[0005] The purpose of this invention is to provide a double-ribbed main beam formwork device for concrete cable-stayed bridges, which solves the problem of time-consuming and labor-intensive formwork assembly and disassembly due to limited space for formwork construction in the prior art.

[0006] The technical solution adopted in this utility model is a double-ribbed main beam formwork device for a concrete cable-stayed bridge, including a main beam top plate, several transverse beams spaced apart in the middle of the main beam top plate, main beam side ribs connected to both ends of the main beam top plate, main beam flange plates connected to both ends of the main beam top plate, the sides of the two main beam flange plates connected to the main beam side ribs, cable anchor blocks connected to the side of the main beam side ribs away from the main beam top plate, cable anchor blocks connected to the two cable anchor blocks, and front support hanging baskets provided at the bottom of the main beam top plate and the transverse beams, the front support hanging baskets connected to the formwork system, and the formwork system matching the main beam top plate and the transverse beams respectively.

[0007] The features of this utility model also include:

[0008] The front support hanging basket is connected to the main anchor of the hanging basket, which is connected to the top plate, and the end of the main anchor of the hanging basket is connected to the front support hanging basket.

[0009] The formwork system includes outer side formwork and inner side formwork that contact the opposite sides of the main beam side ribs. The bottom of the main beam side ribs is connected to the side rib bottom formwork. The two side walls of the transverse diaphragm are provided with transverse diaphragm side formwork. The outer side formwork, inner side formwork, and transverse diaphragm side formwork are all connected to the front support hanging basket. The bottom of the transverse diaphragm is connected to the transverse diaphragm bottom formwork. The bottom of the main beam top plate is connected to the top plate bottom formwork. The bottom of the top plate bottom formwork is connected to the supporting truss system. The supporting truss system is connected to the front support hanging basket.

[0010] The support truss system includes a support truss that contacts the bottom formwork of the top slab. The end of the support truss away from the bottom formwork of the top slab is connected to a lifting mechanism, which is connected to the front support hanging basket.

[0011] The lifting mechanism includes a gantry, which is connected to a supporting truss. The gantry is connected to a truss backbone, which is connected to a wire rope. The front support basket is connected to a truss slide, and the truss backbone is set in the truss slide. The front support basket is also connected to a guide unit, which is connected to the supporting truss.

[0012] The guiding unit includes a truss guide beam, which is connected to the front support hanging basket. The end of the truss guide beam away from the front support hanging basket is connected to the supporting truss.

[0013] A first adjustable support connects the gantry to the supporting truss, and a second adjustable support connects the truss guide beam to the supporting truss.

[0014] The beneficial effects of this utility model are:

[0015] This utility model relates to a double-ribbed main beam formwork device for concrete cable-stayed bridges. The overall lowering height of the hanging basket is small, which enables safe and efficient raising and lowering of the hanging basket. The side forms of the double main ribs and transverse beams are fixed on the hanging basket. The top slab bottom formwork lowering construction and tensioning preparation are carried out in parallel without affecting the beam segment construction period. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the main beam in this utility model;

[0017] Figure 2 This is a schematic diagram of the longitudinal section of the main beam in this utility model;

[0018] Figure 3 This is a longitudinal section layout diagram of the template system in this utility model;

[0019] Figure 4 This is a cross-sectional layout diagram of the template system in this utility model;

[0020] Figure 5 This is a diagram showing the side mold flipping and demolding state of the transverse diaphragm in this utility model;

[0021] Figure 6 This is a schematic diagram of the hoisting and erection of the side rib mold in this utility model;

[0022] Figure 7 This is a zoning diagram of the main beam segment in this utility model;

[0023] Figure 8 This is a plan view of the top plate bottom mold partition in this utility model;

[0024] Figure 9 This is an elevation view of the top plate bottom formwork partition in this utility model;

[0025] Figure 10 This is a layout diagram of the lifting and lowering mechanism in this utility model;

[0026] Figure 11 This is a schematic diagram of the lifting and lowering process of the top plate bottom mold in this utility model;

[0027] Figure 12 This is a comparison diagram of the lifting and lowering states of the top plate and bottom mold in this utility model;

[0028] Figure 13 yes Figure 10 Enlarged view of point A in the middle;

[0029] Figure 14 yes Figure 10 Enlarged view of point B in the middle.

[0030] In the diagram, 1. Main beam top plate, 11. Top plate bottom formwork, 2. Transverse diaphragm beam, 21. Transverse diaphragm beam side formwork, 22. Transverse diaphragm beam bottom formwork, 3. Front support hanging basket, 4. Main beam side rib, 41. Side rib outer formwork, 42. Side rib inner formwork, 43. Side rib bottom formwork, 5. Hanging basket main anchor, 6. Main beam flange plate, 7. Cable anchor block, 8. Cable, 9. Support truss, 91. Portal frame, 92. Truss skeleton beam, 93. Truss slide, 94. Wire rope, 95. Truss guide beam, 96. First adjustable support, 97. Second adjustable support, 10. Hanging basket rear anchor. Detailed Implementation

[0031] The technical solutions in the embodiments of this application will now be described in conjunction with the accompanying drawings.

[0032] This utility model provides a double-ribbed main beam formwork device for concrete cable-stayed bridges, such as... Figure 1-2 As shown, the structure includes a main beam top plate 1, with several transverse beams 2 spaced apart in the middle of the main beam top plate 1. Both ends of the main beam top plate 1 are connected to main beam side ribs 4, and both ends of the main beam top plate 1 are connected to main beam flange plates 6. The sides of the two main beam flange plates 6 are connected to the main beam side ribs 4. The side of the main beam side ribs 4 away from the main beam top plate 1 is connected to a cable anchor block 7, and both cable anchor blocks 7 are connected to cable stays 8. The bottom of the main beam top plate 1 and the transverse beams 2 is provided with a front support hanging basket 3, and the front support hanging basket 3 is connected to a formwork system. The formwork system is matched with the main beam top plate 1 and the transverse beams 2 respectively. The stay cables 8 are connected at the anchor points of the stay cable beam ends of the stay cable anchor blocks 7. The main beam top plate 1, as the main load-bearing component of the bridge, directly bears vertical loads, as well as horizontal loads such as wind loads and seismic loads. The stay cables 8 transfer the load of the main beam top plate 1 to the towers, reducing the bending moment and shear force of the main beam top plate 1 and improving the bridge's spanning capacity. The transverse diaphragm beams 2 connect the various webs or box cavities of the main beam top plate 1, making the main beam top plate 1 a whole spatial structure, improving the torsional stiffness and integrity of the structure. The main beam side ribs 4 improve the shear capacity of the main beam and enhance the structural stiffness. The front support hanging basket 3 serves as a construction platform, bearing the construction load and enabling segmental construction.

[0033] Example 1

[0034] The double-ribbed main girder formwork device for a concrete cable-stayed bridge includes a main girder top plate 1, several transverse diaphragms 2 are spaced apart in the middle of the main girder top plate 1, main girder side ribs 4 are connected to both ends of the main girder top plate 1, main girder flange plates 6 are connected to both ends of the main girder top plate 1, the sides of the two main girder flange plates 6 are connected to the main girder side ribs 4, the side of the main girder side ribs 4 away from the main girder top plate 1 is connected to the cable anchoring block 7, the two cable anchoring blocks 7 are connected to the cable stays 8, and a front support hanging basket 3 is provided at the bottom of the main girder top plate 1 and the transverse diaphragms 2. The front support hanging basket 3 is connected to the formwork system, and the formwork system is matched with the main girder top plate 1 and the transverse diaphragms 2 respectively.

[0035] The front support hanging basket 3 is connected to the main anchor 5, which is connected to the top plate 1 of the main beam. The end of the main anchor 5 is connected to the front support hanging basket 3. When the main beam of the concrete cable-stayed bridge is constructed using the cantilever casting process with the front support hanging basket, after the construction of one main beam segment is completed, the hanging basket needs to be moved forward to the position of the next main beam segment to continue construction. The main anchor 5 of the hanging basket serves as the connecting structure of the front support hanging basket 3 and works with the rear anchor 10 of the hanging basket to stabilize the front support hanging basket 3.

[0036] Example 2

[0037] The double-ribbed main girder formwork device for a concrete cable-stayed bridge includes a main girder top plate 1, several transverse diaphragms 2 are spaced apart in the middle of the main girder top plate 1, main girder side ribs 4 are connected to both ends of the main girder top plate 1, main girder flange plates 6 are connected to both ends of the main girder top plate 1, the sides of the two main girder flange plates 6 are connected to the main girder side ribs 4, the side of the main girder side ribs 4 away from the main girder top plate 1 is connected to the cable anchoring block 7, the two cable anchoring blocks 7 are connected to the cable stays 8, and a front support hanging basket 3 is provided at the bottom of the main girder top plate 1 and the transverse diaphragms 2. The front support hanging basket 3 is connected to the formwork system, and the formwork system is matched with the main girder top plate 1 and the transverse diaphragms 2 respectively.

[0038] The front support hanging basket 3 is connected to the main anchor 5 of the hanging basket, which is connected to the top plate 3. The end of the main anchor 5 is connected to the front support hanging basket 3.

[0039] like Figure 3-4 As shown, the template system includes an outer side mold 41 and an inner side mold 42 that are in contact with the opposite sides of the main beam side rib 4. The bottom of the main beam side rib 4 is connected to a side rib bottom mold 43. The two side walls of the transverse diaphragm 2 are provided with transverse diaphragm side molds 21. The outer side mold 41, the inner side mold 42, and the transverse diaphragm side mold 21 are all connected to the front support hanging basket 3. The bottom of the transverse diaphragm 2 is connected to a transverse diaphragm bottom mold 22. The bottom of the main beam top plate 1 is connected to a top plate bottom mold 11. The bottom of the top plate bottom mold 11 is connected to a support truss system, which is connected to the front support hanging basket 3. The formwork system consists of inner and outer side formwork and bottom formwork for the side ribs, bottom formwork 22 and side formwork for the transverse diaphragm beams, bottom formwork 11 for the top slab, and a formwork support truss system. Conventional formwork systems require formwork dismantling and installation. However, due to limited space after concrete pouring, large-area formwork hoisting cannot be performed using hoisting machinery, relying entirely on manual labor, requiring significant manpower and time, and posing high construction risks. The main beam has a large longitudinal slope (maximum 4.5%), and each beam segment is different. The formwork is parallel to the main beam longitudinally; therefore, during the lowering process, the side formwork of the bilateral main ribs and transverse diaphragm beams must be detached from the concrete surface. Under confined space conditions, the side formwork of the bilateral main ribs and transverse diaphragm beams is fixed to the formwork and removed using a flipping / removal method. The transverse diaphragm beam side formwork 21 is removed using a bridge deck gantry and electric hoist. Figure 5As shown. The side rib formwork is lowered, tilted, and removed using a tower crane or truck crane, as shown. Figure 6 As shown.

[0040] Example 3

[0041] The double-ribbed main girder formwork device for a concrete cable-stayed bridge includes a main girder top plate 1, several transverse diaphragms 2 are spaced apart in the middle of the main girder top plate 1, main girder side ribs 4 are connected to both ends of the main girder top plate 1, main girder flange plates 6 are connected to both ends of the main girder top plate 1, the sides of the two main girder flange plates 6 are connected to the main girder side ribs 4, the side of the main girder side ribs 4 away from the main girder top plate 1 is connected to the cable anchoring block 7, the two cable anchoring blocks 7 are connected to the cable stays 8, and a front support hanging basket 3 is provided at the bottom of the main girder top plate 1 and the transverse diaphragms 2. The front support hanging basket 3 is connected to the formwork system, and the formwork system is matched with the main girder top plate 1 and the transverse diaphragms 2 respectively.

[0042] The front support hanging basket 3 is connected to the main anchor 5 of the hanging basket, which is connected to the top plate 3. The end of the main anchor 5 is connected to the front support hanging basket 3.

[0043] The template system includes an outer side mold 41 and an inner side mold 42 that are in contact with the opposite sides of the main beam side rib 4. The bottom of the main beam side rib 4 is connected to a side rib bottom mold 43. The two side walls of the transverse diaphragm 2 are provided with transverse diaphragm side molds 21. The outer side mold 41, the inner side mold 42, and the transverse diaphragm side mold 21 are all connected to the front support hanging basket 3. The bottom of the transverse diaphragm 2 is connected to a transverse diaphragm bottom mold 22. The bottom of the main beam top plate 1 is connected to a top plate bottom mold 11. The bottom of the top plate bottom mold 11 is connected to a support truss system, which is connected to the front support hanging basket 3.

[0044] The supporting truss system includes supporting trusses 9, which contact the top slab bottom formwork 11. A lifting mechanism is connected to the end of the supporting truss 9 furthest from the top slab bottom formwork 11, and this lifting mechanism is connected to the front support hanging basket 3. The top slab bottom formwork 11 occupies a large area of ​​the total formwork and is numerous. Based on its structural characteristics, the top slab bottom formwork 11 is divided into three areas, such as... Figure 7-8 As shown, areas 1 and 2 are installed and dismantled by lifting and lowering the formwork as a whole. Area 3 is fixed on the formwork so as not to affect the lowering and lifting operation of the hanging basket. This can reduce construction time. The overall lowering height of the top plate bottom formwork areas 1 and 2 is determined according to the height required for the overall lowering of the hanging basket.

[0045] like Figure 9-10As shown, the lifting mechanism includes a gantry 91, which is connected to a supporting truss 9. The gantry 91 is connected to a truss beam 92, which is connected to a wire rope 94. A front support basket 3 is connected to a truss slide 93, and the truss beam 92 is positioned within the truss slide 93. The front support basket 3 is also connected to a guide unit, which is connected to the supporting truss 9. After the top slab bottom formwork 11 is lowered, it also serves as a support platform after the transverse beam side formwork is flipped and demolded. To reduce the weight of the top slab bottom formwork 11, the support system adopts a truss structure. The supporting truss 9 is supported on the truss slide beam 92 and the guide unit. While ensuring the safety of lowering / lifting the top slab bottom formwork 11, and to facilitate rapid lowering / lifting of the top slab bottom formwork 11 and save manpower, the single-area top slab bottom formwork 11 is lowered / lifted at four points at both ends. The lowering / lifting device uses the gantry 91 and an existing electric hoist on site. A steel wire rope 94 connects the electric hoist to the truss sliding beam 92. During the lowering / raising of the top slab bottom formwork 11, only the truss sliding beam 92 needs to be lowered / raised, and the truss skeleton beam 92 slides within the truss sliding groove 93. The overall raising and lowering process and status of the top slab bottom formwork 11 are as follows. Figure 11-12 As shown.

[0046] The guiding unit includes a truss guide beam 95, which is connected to the front support basket 3. The end of the truss guide beam 95 away from the front support basket 3 is connected to the supporting truss 9. During the raising and lowering process of the truss skeleton beam 92, the truss uprights located on the truss guide beam 95 pass through the slots on the truss guide beam 95 after the second adjustable support is removed.

[0047] like Figure 13-14 As shown, a first adjustable support 96 connects the portal frame 91 to the supporting truss 9, and a second adjustable support 97 connects the truss guide beam 95 to the supporting truss 9. The supporting truss 9 is supported on the truss sliding beam 92 and the truss guide beam 95. The height of the supporting truss 9 is adjusted by the first adjustable support 96 and the second adjustable support 97, thereby adjusting the elevation of the bottom formwork 11 of the top plate.

[0048] The working principle of this utility model of a double-ribbed main beam formwork device for concrete cable-stayed bridges is as follows:

[0049] The transverse diaphragm side formwork 21 is dismantled and demolded using a bridge deck gantry and electric hoist. The side rib side formwork is dismantled and demolded by lowering and flipping it using a tower crane or truck crane. The top slab bottom formwork 11 occupies a large area of ​​the total formwork and is numerous. Based on the structural characteristics, the top slab bottom formwork 11 is divided into 3 areas. On the basis of ensuring the safety of lowering / lifting the top slab bottom formwork 11, in order to facilitate the rapid lowering / lifting of the top slab bottom formwork 11 and save manpower, the top slab bottom formwork 11 in a single area is lowered / lifted at 4 points at both ends. The electric hoist and the truss sliding beam 92 are connected by steel wire rope 94. When lowering / lifting the top slab bottom formwork 11, only the truss sliding beam 92 needs to be lowered / lifted.

[0050] This utility model relates to a double-ribbed main beam formwork device for concrete cable-stayed bridges. The bottom formwork of the transverse diaphragm beam is fixed to the hanging basket at the front support point, eliminating the need for dismantling and reinstallation during construction. It is raised and lowered along with the hanging basket at the front support point, improving construction efficiency. The lowering of the top slab bottom formwork and the preparation for tensioning can be carried out concurrently, without affecting the beam segment construction period. Similarly, the lifting of the top slab bottom formwork and the tensioning of the stay cables can be carried out concurrently, also without affecting the beam segment construction period.

Claims

1. A double-ribbed main beam formwork device for a concrete cable-stayed bridge, characterized in that, The structure includes a main beam top plate (1), with several transverse beams (2) spaced apart in the middle of the main beam top plate (1). Both ends of the main beam top plate (1) are connected to main beam side ribs (4), and both ends of the main beam top plate (1) are connected to main beam flange plates (6). The sides of the two main beam flange plates (6) are connected to the main beam side ribs (4). The side of the main beam side ribs (4) away from the main beam top plate (1) is connected to a cable anchor block (7), and both cable anchor blocks (7) are connected to cable stays (8). The bottom of the main beam top plate (1) and the transverse beams (2) is provided with a front support hanging basket (3), and the front support hanging basket (3) is connected to a template system. The template system is matched with the main beam top plate (1) and the transverse beams (2) respectively.

2. The double-ribbed main beam formwork device for concrete cable-stayed bridges according to claim 1, characterized in that, The front support hanging basket (3) is connected to the hanging basket main anchor (5), the hanging basket main anchor (5) is connected to the top plate (1) of the main beam, and the end of the hanging basket main anchor (5) is connected to the front support hanging basket (3).

3. The double-ribbed main beam formwork device for a concrete cable-stayed bridge according to claim 1, characterized in that, The template system includes an outer side mold (41) and an inner side mold (42) of the side rib that are in contact with the opposite sides of the side rib (4) of the main beam. The bottom of the side rib (4) of the main beam is connected to the bottom mold (43) of the side rib. The two side walls of the transverse diaphragm (2) are provided with transverse diaphragm side molds (21). The outer side mold (41), the inner side mold (42) of the side rib and the transverse diaphragm side mold (21) are all connected to the front support hanging basket (3). The bottom of the transverse diaphragm (2) is connected to the bottom mold (22) of the transverse diaphragm. The bottom of the top plate (1) of the main beam is connected to the bottom mold (11) of the top plate. The bottom of the bottom mold (11) of the top plate is connected to the bottom of the supporting truss system. The supporting truss system is connected to the front support hanging basket (3).

4. The double-ribbed main beam formwork device for a concrete cable-stayed bridge according to claim 3, characterized in that, The support truss system includes a support truss (9), which is in contact with the bottom formwork of the top plate (11). The end of the support truss (9) away from the bottom formwork of the top plate (11) is connected to a lifting mechanism, which is connected to the front support hanging basket (3).

5. The double-ribbed main beam formwork device for a concrete cable-stayed bridge according to claim 4, characterized in that, The lifting mechanism includes a gantry (91) connected to a support truss (9), a truss beam (92) connected to the gantry (91), a wire rope (94) connected to the truss beam (92), a truss slide (93) connected to the front support basket (3), the truss beam (92) being located in the truss slide (93), and a guide unit connected to the front support basket (3), which is connected to the support truss (9).

6. The double-ribbed main beam formwork device for a concrete cable-stayed bridge according to claim 5, characterized in that, The guiding unit includes a truss guide beam (95), which is connected to the front support basket (3), and the end of the truss guide beam (95) away from the front support basket (3) is connected to the support truss (9).

7. The double-ribbed main beam formwork device for a concrete cable-stayed bridge according to claim 5, characterized in that, A first adjustable support (96) is connected between the gantry (91) and the supporting truss (9), and a second adjustable support (97) is connected between the truss guide beam (95) and the supporting truss (9).

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