Supporting structure of large cantilever bent cap

Abstract

The utility model relates to a supporting structure of a large cantilever bent cap, which comprises a bearing platform supported by a pile foundation, a pier column is arranged on the bearing platform, and steel pipe stand columns are arranged on the bearing platform at least close to four corners of the outer edge of the pier column. The steel pipe stand columns support the bearing main beams from the lower portion, the bearing main beams are arranged in a bilateral symmetry mode in the length direction, each bearing main beam comprises an upper I-shaped steel beam and a lower I-shaped steel beam, the upper I-shaped steel beams are fixed to the upper portions of the lower I-shaped steel beams, and the length of the upper I-shaped steel beams is larger than that of the cover beams. The lower I-shaped beam is shorter than the cover beam; a plurality of groups of transverse distribution beams are arranged on the bearing main beam, the plurality of groups of transverse distribution beams are arranged along the length direction of the bearing main beam, and a capping beam bottom die is arranged on the transverse distribution beams. The scheme has the advantages of being high in bearing capacity, high in integrity and good in coordination.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge engineering construction technical field especially relates to a support structure of big cantilever bent cap. BACKGROUND

[0002] With the development of economy and the promotion of social demand, the existing ground (municipal) road is difficult to meet the growth of current traffic flow, and it is urgent to expand the traffic capacity of the existing road. Therefore, the viaduct emerges as the times require, on the one hand, the existing road can be transformed and improved, and on the other hand, through the three-dimensional traffic, the land occupation and investment can be reduced.

[0003] But when the viaduct structure design is carried out on the existing road line, in order to maintain the space and vision of the ground road passing vehicles, the viaduct bent cap is often designed into a big cantilever bent cap (the single end cantilever length is more than 9m), and during the bridge construction, the traffic is kept while the construction is kept, so that higher requirements are put forward for the support system of the big cantilever bent cap. In engineering practice, the traditional door pier type support is often used, the door pier column base is used on the top of the pile foundation platform on the side close to the pier column, and the door pier column is arranged on the ground on the other side, which compresses the ground driving space to a certain extent, and the support is prone to uneven settlement. Especially when the project is located in the soft foundation and low clearance environment, the support system design of the big cantilever bent cap will face greater difficulties. SUMMARY

[0004] In order to solve the above problems, the purpose of the utility model is to provide a support structure of big cantilever bent cap.

[0005] A support structure of big cantilever bent cap, comprising a pile foundation supported platform, a pier column is arranged on the platform, and at least a steel pipe stand is arranged at the four corners close to the outer edge of the pier column on the platform; at least two load bearing main beams arranged side by side, the steel pipe stand supports the load bearing main beam from below, the load bearing main beam is symmetrically arranged in length direction, each load bearing main beam comprises an upper I-beam and a lower I-beam, the length of the upper I-beam is greater than the length of the bent cap, and the length of the lower I-beam is less than the length of the bent cap; a plurality of transverse distribution beams are arranged on the load bearing main beam, the plurality of transverse distribution beams are arranged along the length direction of the load bearing main beam, and a bent cap bottom die is mounted on the transverse distribution beam.

[0006] As a preferred, the unloading device of unloading block, sand box or sand cylinder is arranged between the steel pipe stand and the load bearing main beam.

[0007] As a preferred, the steel pipe stand comprises a plurality of mutually connected steel pipe standard sections.

[0008] As a preferred, the adjacent steel pipe stands are connected through a flat link frame.

[0009] As preferred, the support steel pipes and the tensioning screw rods are arranged between the upper I-beams and between the lower I-beams.

[0010] As preferred, the width of the transverse distribution beam is greater than the width of the bent cap, and the adjacent transverse distribution beams are arranged in staggered manner in the width direction of the load bearing main beam.

[0011] As preferred, the upper I-beam is suspended with a light hanging type bottom protection.

[0012] As preferred, the upper I-beam and the lower I-beam are respectively provided with reinforcing plates and stiffening ribs.

[0013] As preferred, the length of the upper I-beam = the length of the bent cap + 2m, and the length of the lower I-beam = the length of the upper I-beam - 12m.

[0014] As preferred, the adjacent transverse distribution beams are arranged in staggered manner in the width direction of the bent cap.

[0015] The above scheme of the utility model is especially suitable for the large cantilever landing support system of soft foundation. The structure uses the upper and lower I-beams to form the load bearing main beam of the bent cap support in "Z" shape, uses the existing pile cap to set the steel pipe column as the support pier of the main beam, and can transfer all the construction loads of the cast-in-place bent cap to the pile cap. The structure not only can provide the passing space for the vehicles under the bridge and the social vehicles, but also can ensure the safety of the vehicles passing through by the light hanging type bottom protection. The support structure system has high bearing capacity, high integrity, good coordination, beautiful structure, simple production, convenient hoisting, and especially when the assembly method is used, it is more convenient for the turnover. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the elevation structure schematic diagram of the utility model;

[0017] Figure 2 It is the plane structure schematic diagram of the utility model;

[0018] Figure 3 It is the side structure schematic diagram of the utility model;

[0019] Figure 4 It is the connection structure schematic diagram of the upper and lower I-beams;

[0020] Figure 5 It is the connection structure schematic diagram of the steel pipe column and the pile cap;

[0021] Figure 6 It is the stiffening rib plane structure schematic diagram of the load bearing main beam arranged in parallel;

[0022] Figure 7A schematic diagram of the elevation structure of the load-bearing main beams arranged side by side;

[0023] Figure 8 A schematic diagram of the side door structure with load-bearing main beams arranged side by side.

[0024] Figure label:

[0025] 1. Foundation 2. Pile foundation 3. Embedded steel plate 4. Anchor bolt 5. Steel pipe column 6. Stiffening plate 7. Horizontal bracing frame 8. Sand box 9. Column top sealing plate 10. Pad beam 11. Upper H-beam 12. Lower H-beam 13. Transverse distribution beam 14. Stiffening rib 15. Supporting steel pipe 16. Tie rod 17. Stiffening upper plate 18. Stiffening lower plate 19. Hanging bottom protection 20. Cap beam 21. Cap beam bottom formwork 22. Pier column. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below.

[0027] This embodiment provides a support structure for a large cantilever cap beam 20, which is particularly suitable for complex environments where construction and traffic are carried out simultaneously on soft foundations. For example... Figures 1-8 As shown, the supporting structure of the large cantilever cap beam 20 in this embodiment includes a pile cap 1 supported by pile foundation 2, and a pier 22 is provided on the pile cap 1. The pier 22 extends upward to connect with the cap beam 20. The structure of the pier 22 and the cap beam 20 is a conventional arrangement in the art and will not be described in detail here.

[0028] In a specific embodiment, at least two piers 22 are included. Steel pipe columns 5 are provided on the pier cap 1 at at least four corners adjacent to the outer edge of the piers 22. In this embodiment, the four corners adjacent to the outer edge of the piers 22 refer to the four corners of the area formed by all the piers 22. Figure 2 As shown, in one specific embodiment, two piers 22 are included. The cross-section of each pier 22 is rectangular or nearly rectangular, and the area formed by the two piers 22 is rectangular. Steel pipe columns 5 are installed at the four corners of this large rectangle, i.e., at the two outer corners of each pier 22. In other embodiments, for example, if the cross-section of each pier 22 is circular, steel pipe columns 5 can also be installed close to the two outer corners of each pier 22. By installing the steel pipe columns 5 as described above, the force on each steel pipe column 5 is evenly distributed, and part of the force is transferred to the piers 22 by being close to them, resulting in reliable load-bearing performance. The steel pipe columns 5 and their adjacent piers 22 are tightly protected with geotextile.

[0029] like Figure 5As shown, the steel pipe column 5 uses the bearing platform 1 as a support base, and is connected and fastened with the top surface of the bearing platform 1 through the embedded steel plate 3 or the anchor bolt 4. The connection between the bottom of the steel pipe column 5 and the bearing platform 1 is provided with a stiffener 6 to enhance the structure of the connection. Preferably, the steel pipe column 5 adopts a modular design, including a plurality of interconnected steel pipe standard sections, which are combined through steel pipe standard sections of different heights, supplemented by I-beam cushion beams 10 and sand boxes 8 or sand cylinders to meet the height requirements of different piers 22. In a specific embodiment, the steel pipe column 5 adopts φ529x8mm, and the length of the steel pipe standard section can be set as required, and in specific construction, steel pipe standard sections of different lengths can be mixedly used. The sections of the steel pipe column 5 are connected through flanges. As shown, Figure 1 As shown, the adjacent steel pipe columns 5 are connected through the flat link frame 7. The connection between the steel pipe columns 5 adopts an I-beam and [16 channel steel frame, and the flat link between the steel pipes can be adjusted according to the actual construction conditions or requirements, and is connected in a welding or bolted end plate mode, which requires firm and reliable connection.

[0030] In combination with Figure 1 and Figure 2 , including at least two load-bearing main beams arranged side by side, the steel pipe column 5 supports the load-bearing main beam from below. The steel pipe column 5 and the load-bearing main beam are provided with unloading blocks, sand boxes 8 or sand cylinders as unloading devices. Each steel pipe column 5 is laid with a column top sealing plate 9 with a thickness not less than 20mm, and if necessary, a reinforcing rib is arranged around the top of the column to enhance the strength of the connection at the top of the steel pipe. The sand cylinder can be directly arranged on the top of the column, and the sand box 8 or the unloading block needs to be provided with a cushion beam 10, but the installation center line needs to be strictly controlled and cannot be installed eccentrically. The size of the sand box 8 can adopt 70x120cm, and the size of the sand cylinder can adopt φ80cm, which is made of Q235 16mm steel plate, with a height of 30-60cm, and a settlement of 3-5mm is reserved during the manufacture of the sand box 8 or the sand cylinder, which can accurately adjust the elevation of the cross beam in a small range. The unloading block directly adopts a finished product.

[0031] The load-bearing main beam is symmetrical along the center line in the length direction, and each load-bearing main beam includes an upper I-beam 11 and a lower I-beam 12, the upper I-beam 11 is fixed on the upper part of the lower I-beam, and the length of the upper I-beam 11 is greater than the length of the cap beam 20, and the length of the lower I-beam is less than the length of the cap beam 20, that is, the two ends of the lower I-beam 12 are retracted by the same distance relative to the upper I-beam 11. In this embodiment, the profiles of the upper and lower I-beams 12 adopt I90 I-beams, and other I-beams conforming to the specifications can also be used. The load-bearing main beam adopts the upper and lower combination form of the I-beam, the length of the upper I-beam 11 = the length of the cap beam 20 + 2m, and each end is 1m wider than the cap beam 20; the length of the lower I-beam 12 = the length of the upper I-beam 11 - 12m, and each end is retracted by 6m. In the embodiment, the upper I-beam 11 and the lower I-beam 12 are welded and fixed as a whole, so that they can achieve better overall support effect.

[0032] The load bearing girder and the steel pipe column 5 are arranged as described above, the upper and lower combined I-beams are used as the load bearing girder of the bent cap 20 support, and the steel pipe column 5 arranged close to the four corners of the pier column 22 of the pile cap 1 is used as the support pier of the support girder, so that the construction load of the cast-in-place bent cap 20 can be effectively transmitted to the pile cap 1. Meanwhile, the load bearing girder is arranged in a cantilevered manner, which can provide a clear passage and an open view for the construction vehicles and social vehicles under the bridge.

[0033] Preferably, in order to facilitate transportation and installation, the upper I-beam 11 includes two segments symmetrical in length, and the two segments are connected by high-strength bolts at the construction site. The upper I-beam 11 and the lower I-beam 12 are welded and fixed at the construction site.

[0034] As shown in Figures 6-8 , the upper and lower I-beams 12 are respectively provided with reinforcing plates and stiffening ribs 14. In the embodiment, a 10mm thick steel plate is used as the stiffening rib 14, which is arranged at an interval of 1.5m. The upper I-beam 11 is provided with a stiffening upper plate 17, and the lower I-beam 12 is provided with a stiffening lower plate 18. The stiffening upper plate 17 and the stiffening lower plate 18 are 2cm thick, the stiffening upper plate 17 is 5.5m long, and is welded and fixed to the upper surface of the upper I-beam 11. The stiffening lower plate 18 is 3m long, and is welded and fixed to the lower surface of the lower I-beam 12 and is cut-out welded with the side surface of the lower I-beam 12.

[0035] In the side-by-side arranged load bearing girders, the adjacent upper I-beams 11 and the lower I-beams 12 are connected by support steel pipes 15 and tensioning screws 16. In order to facilitate the combined assembly, the support steel pipes 15 between the two combined I-beam girders are connected by flanges.

[0036] A plurality of transverse distribution beams 13 are arranged on the load bearing girder, the plurality of transverse distribution beams 13 are arranged along the length direction of the load bearing girder, and the bent cap bottom die 21 is mounted on the transverse distribution beam 13. In the embodiment, the width of the transverse distribution beam 13 is greater than the width of the bent cap 20, and the adjacent transverse distribution beams 13 are arranged in a staggered manner in the width direction of the load bearing girder, as shown in Figure 2 . The transverse distribution beams 13 arranged in a staggered manner overlap within the width range of the bent cap 20, and the two sides are spaced apart to provide a passage and protection. Meanwhile, the light hanging bottom protection 19 is suspended above the ground road vehicle passage below the upper I-beam 11, which ensures the safety of the ground road vehicle passage.

[0037] The mounting process of the bearing main girder is as follows: each bearing main girder is mounted respectively, before mounting, the upper I-beam 11 and the lower I-beam 12 are integrally welded and fixed by using a crane, and then are integrally hoisted by using two cranes synchronously. At least two connecting points are arranged during hoisting to ensure that the I-beams cannot be tilted. After the single-side bearing main girder is mounted, the other side bearing main girder is mounted in the same order, and the two side frame pieces are connected by using a support frame immediately after hoisting in place.

[0038] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A support structure for a large cantilever cap beam, characterized in that, The platform supported by pile foundation is provided with pier columns, and at least four corners close to the outer edge of the pier columns are provided with steel pipe columns; at least two load-bearing main beams are arranged side by side, the steel pipe columns support the load-bearing main beams from below, the load-bearing main beams are symmetrically arranged left and right in the length direction, each load-bearing main beam comprises an upper I-beam and a lower I-beam, the upper I-beam is fixed on the upper portion of the lower I-beam, the length of the upper I-beam is greater than the length of the bent cap, and the length of the lower I-beam is less than the length of the bent cap; a plurality of groups of transverse distribution beams are arranged on the load-bearing main beam, the transverse distribution beams are arranged along the length direction of the load-bearing main beam, and a bent cap bottom die is arranged on the transverse distribution beam.

2. The support structure for a large cantilevered canopy beam according to claim 1, wherein, The steel pipe column and the load-bearing main beam are provided with unloading blocks, sandboxes or sand cylinders as unloading devices.

3. The support structure for a large cantilevered canopy beam of claim 1, wherein, The steel pipe column comprises a plurality of interconnected steel pipe standard sections.

4. The support structure for a large cantilevered canopy beam of claim 1, wherein, The adjacent steel pipe columns are connected through flat link frames.

5. The support structure for a large cantilevered canopy beam according to claim 1, wherein, In the load-bearing main beams arranged side by side, the adjacent upper I-beams and the adjacent lower I-beams are connected through support steel pipes and tensioning screws.

6. The support structure for a large cantilevered canopy beam of claim 1, wherein, The width of the transverse distribution beam is greater than the width of the bent cap, and the adjacent transverse distribution beams are arranged in staggered intervals in the width direction of the load-bearing main beam.

7. The support structure for a large cantilevered canopy beam of claim 1, wherein, The upper I-beam is suspended with a light hanging type bottom protection.

8. The support structure for a large cantilevered canopy beam of claim 1, wherein, The upper I-beam and the lower I-beam are respectively provided with reinforcing plates and stiffening ribs.

9. The support structure for a large cantilevered canopy beam of claim 1, wherein, The length of the upper I-beam = the length of the bent cap + 2m, and the length of the lower I-beam = the length of the upper I-beam - 12m.

10. The support structure for a large cantilevered canopy beam of claim 1, wherein, The upper I-beam comprises two segments symmetrically arranged in the length direction, and the two segments are connected through high-strength bolts.

Images