Cast-in-place box girder support structure

Abstract

The utility model discloses a cast-in-place box girder support structure which comprises a steel pipe stand column, a steel pipe top cross beam, a plurality of sets of bearing beams and a distribution beam, a square wood structure is arranged on the upper surface of the distribution beam, and a box girder and the distribution beam are isolated through the square wood structure. The two ends of a distribution beam of the support structure extend to the outside of the bearing beam, guardrail structures are distributed on the distribution beam extending to the outside of the bearing beam, and the guardrail structures and the distribution beam form an operation platform for operators. The support structure is mainly stressed by the concrete foundation, the steel pipe column, the bailey beam, the I-shaped steel and the wood formwork, stress analysis and check calculation of all parts are simple, working stress conditions of various materials are easy to support and control, the support has enough strength, rigidity and stability, the settlement amount is small, and the line type of a bridge, the quality of a box beam and the safety of constructors are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a cast-in-situ box girder support. Background Art

[0002] In bridge construction, some upper structures of bridges adopt reinforced concrete cast-in-situ box girders or pre-stressed concrete simply supported T-beams, and a combined structure of reinforced concrete cast-in-situ box girders. The current continuous box girder structure form: the beam body is a double-box double-chamber, equal-height structure, and the bottom plate, web plate, and top plate are locally thickened inward.

[0003] However, in current bridge construction, for special construction environments, there are problems such as poor road conditions, large traffic flow, and frequent blockages of construction material vehicles. Therefore, for special construction environments, the cast-in-situ beam construction using a cast-in-situ box girder support can ensure that each process is closely connected, is easy to form a flow operation, reasonably arrange the progress, implement network control, do a good job in process connection, implement progress monitoring, and ensure the realization of the construction period target.

[0004] Therefore, based on the above technical problems, those skilled in the art urgently need to develop a cast-in-situ box girder support structure. Content of the Utility Model

[0005] The purpose of the utility model is to provide a cast-in-situ box girder support structure, which has clear force-bearing, sufficient strength, stiffness, and stability, small settlement, and can ensure the bridge alignment, the quality of the box girder, and the safety of construction personnel.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A cast-in-situ box girder support structure of the utility model, multiple groups of which are arranged along the longitudinal extension direction of the bridge. The support structure includes:

[0008] Steel pipe columns;

[0009] A steel pipe top cross beam arranged at the upper end of the steel pipe column and extending along the transverse direction of the bridge. The length of the steel pipe top cross beam is greater than the distance between two steel pipe columns so as to partially extend to the outside of the columns. The steel pipe top cross beam is made of I-beam;

[0010] Multiple groups of load-bearing beams arranged on the upper surface of the steel pipe top cross beam. The load-bearing beams extend along the longitudinal direction of the bridge, and multiple groups of the load-bearing beams are arranged along the transverse direction of the bridge; and

[0011] A distribution beam arranged on the upper surface of the load-bearing beam. A square wood structure is arranged on the upper surface of the distribution beam, and the box girder is isolated from the distribution beam through the square wood structure;

[0012] Both ends of the distribution beam of the support structure extend to the outside of the load-bearing beam, and guardrail structures are arranged on the distribution beam extending to the outside of the load-bearing beam. An operating platform for the operating workers is formed by the guardrail structure and the distribution beam.

[0013] Furthermore, each steel pipe column is connected by multiple steel pipes;

[0014] Adjacent steel pipes are connected by flange plates;

[0015] The diameter of the steel pipe is 609mm, and the wall thickness of the steel pipe is 16mm.

[0016] Furthermore, a steel pipe foundation is arranged at the lower end of the steel pipe column;

[0017] The steel pipe foundation is a sand bucket structure of a bridge temporary support, and the sand bucket structure of the bridge temporary support includes:

[0018] A support base cylinder, which is filled with dry fine sand inside, and multiple M27 bolts are arranged along the circumferential direction of the side wall of the support base cylinder;

[0019] A support upper cylinder partially located inside the support base cylinder and pressing the internal dry fine sand, and C30 concrete is filled inside the support upper cylinder;

[0020] The steel pipe column passes through the support upper cylinder and partially extends into the support base cylinder, and the lower end of the steel pipe column is positioned and fixed by multiple M27 bolts.

[0021] Furthermore, a horizontal bracing and cross bracing structure is arranged between adjacent steel pipe columns;

[0022] The horizontal bracing and cross bracing structure includes:

[0023] A horizontal channel steel extending in the horizontal direction and connected to two adjacent steel pipe columns; and

[0024] An inclined channel steel connected between the two horizontal channel steels;

[0025] Both the horizontal channel steel and the inclined channel steel are made of 20# channel steel.

[0026] Furthermore, a drop-off support is arranged between the steel pipe column and the top steel pipe beam;

[0027] The top steel pipe beam of the steel pipe is made of I56a I-beam.

[0028] Furthermore, the 321 type Bailey truss is selected as the load-bearing beam;

[0029] Five groups of load-bearing beams are arranged along the transverse direction of the bridge;

[0030] Two sets of the load-bearing beams are provided at positions near the two lateral sides of the bridge, and one set of the load-bearing beams is provided at the position in the middle of the bridge transversely.

[0031] Further, the distribution beam is made of 20# I-beam;

[0032] The square wood structure between the distribution beam and the box girder includes:

[0033] Multiple square woods arranged at intervals, and the cross-sectional dimension of the square wood is 10 cm * 10 cm, and the distance between adjacent square woods is 20 cm and / or 30 cm; and

[0034] The bamboo plywood with a thickness of 1.5 cm laid on the upper surface of the square wood.

[0035] Further, the upper surface of the part where the distribution beam extends outside the load-bearing beam is laid with the bamboo plywood with a thickness of 1.5 cm;

[0036] The guardrail structure includes:

[0037] Multiple vertical poles with a transverse distance and a longitudinal distance of 0.9 m, a layer of 10 cm * 10 cm square wood is arranged at the top of the vertical pole as the main keel, and multiple 10 cm * 10 cm square woods are arranged as secondary keels at a distance of 30 cm on the main keel, and the bamboo plywood with a thickness of 1.5 cm is laid.

[0038] Further, the step distance of the operation platform is 0.6 m.

[0039] Further, adjacent steel pipe columns serve as the pouring foundation of the bridge columns.

[0040] In the above technical solution, a cast-in-place box girder support structure provided by the present utility model has the following beneficial effects:

[0041] The support structure of the present utility model is mainly stressed by the concrete foundation, steel pipe columns, Bailey beams, I-beams, and wooden formworks. The stress analysis and calculation of each part are relatively simple, and it is easy to control the working stress conditions of various materials. The support has sufficient strength, stiffness, and stability, with a small settlement amount, ensuring the bridge alignment, the quality of the box girder, and the safety of construction workers. Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0043] Figure 1 The layout diagram of the cast-in-place box girder support structure disclosed in the embodiment of the present application during bridge construction;

[0044] Figure 2 The structural schematic diagram of the cast-in-place box girder support structure disclosed in the embodiment of the present application;

[0045] Figure 3 The enlarged structural diagram of the operation platform of the cast-in-place box girder support structure disclosed in the embodiment of the present application;

[0046] Figure 4 The structural schematic diagram of the construction state of the cast-in-place box girder support structure disclosed in the embodiment of the present application;

[0047] Figure 5 The structural schematic diagram of the steel pipe foundation of the cast-in-place box girder support structure disclosed in the embodiment of the present application.

[0048] Explanation of reference numerals:

[0049] 10. Bridge column; 11. Box girder;

[0050] 1. Steel pipe column; 2. Horizontal bracing and cross bracing structure; 3. Steel pipe top cross beam; 4. Load-bearing beam; 5. Distribution beam; 7. Operation platform;

[0051] 101. Steel pipe; 102. Flange plate; 103. Shoring support;

[0052] 201. Horizontal channel steel; 202. Inclined channel steel;

[0053] 501. Support base cylinder; 502. Dry fine sand; 503. M27 bolt; 504. Support upper cylinder; 505. C30 concrete;

[0054] 601. Square timber; 602. Bamboo plywood;

[0055] 701. Vertical pole. Detailed implementation manners

[0056] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0057] See Figures 1 to 5 as shown;

[0058] This embodiment discloses a cast-in-place box girder support structure. Multiple groups of the support structures are arranged along the longitudinal extension direction of the bridge. The support structure includes:

[0059] Steel pipe column 1;

[0060] A steel pipe top cross beam 3 is arranged at the upper end of the steel pipe column 1 and extends along the transverse direction of the bridge. The length of the steel pipe top cross beam 3 is greater than the spacing between two steel pipe columns 1 so as to partially extend to the outside of the steel pipe column 1. The steel pipe top cross beam 3 is made of I-beam;

[0061] A plurality of groups of load-bearing beams 4 are arranged on the upper surface of the steel pipe top cross beam 3. The load-bearing beams 4 extend along the longitudinal direction of the bridge, and the plurality of groups of load-bearing beams 4 are arranged along the transverse direction of the bridge; and

[0062] A distribution beam 5 is arranged on the upper surface of the load-bearing beam 4. A square wood structure is arranged on the upper surface of the distribution beam 5. The box girder 11 and the distribution beam 5 are isolated by the square wood structure;

[0063] Both ends of the distribution beam 5 of the support structure partially extend to the outside of the load-bearing beam 4, and guardrail structures are distributed at the parts where the distribution beam 5 extends to the outside of the load-bearing beam 4. An operation platform for operators is formed by the guardrail structures and the distribution beam 5.

[0064] Specifically, this embodiment discloses a cast-in-place box girder support structure mainly composed of a concrete foundation, steel pipe columns, Bailey beams, I-beams, and wooden formworks as the force-bearing structure. A plurality of groups of support structures are arranged according to the extension track of the bridge and serve as the standard and foundation for the pouring of the bridge column 10. Among them, the steel pipe columns 1 of this embodiment are arranged according to the bridge width and span. The maximum transverse spacing is 8.4 m, and the maximum longitudinal spacing is 7.5 m, which can be adjusted according to the bridge deck width. The spacing of all cast-in-place box girder supports does not exceed the design parameters of the drawings.

[0065] The upper end of the steel pipe column 1 of this embodiment supports the steel pipe top cross beam 3. The upper end of the steel pipe top cross beam 3 is provided with a load-bearing beam 4, and a distribution beam 5 is arranged on the load-bearing beam 4, finally forming the space of the cast-in-place box girder and the temporary operation platform for operators at the positions of the two side wing plates.

[0066] Preferably, each steel pipe column 1 of this embodiment is connected by a plurality of steel pipes 101; the adjacent steel pipes 101 are connected by flange plates 102; the diameter of the steel pipe 101 is 609 mm, and the wall thickness of the steel pipe 101 is 16 mm.

[0067] Preferably, a steel pipe foundation 5 is arranged at the lower end of the steel pipe column 1 of this embodiment;

[0068] The steel pipe foundation 5 is a temporary bridge support sand bucket structure, which includes a support base tube 501, which is filled with dry fine sand 502, and the side wall of the support base tube 501 is provided with multiple M27 bolts 503 along its circumference; a support upper tube 504 is partially located in the support base tube 501 and compresses the internal dry fine sand, and the support upper tube 504 is filled with C30 concrete 505; the steel pipe column 1 passes through the support upper tube 504 and partially extends into the support base tube 501, and the lower end of the steel pipe column 1 is positioned and fixed by multiple M27 bolts 503.

[0069] In order to improve the structural strength, a parallel connection and a scissor brace structure 2 are provided between adjacent steel pipe columns 1 in this embodiment;

[0070] The parallel joint and scissors brace structure 2 includes a horizontal channel steel 201 extending in the horizontal direction and connected to two adjacent steel pipe columns 1; and an inclined channel steel 202 connected between the two horizontal channel steels 201; wherein, the horizontal channel steel 201 and the inclined channel steel 202 of this embodiment are both 20# channel steels.

[0071] After the steel pipe columns 1 of this embodiment are installed, the steel pipe columns 1 and the steel pipe columns 1 are connected. The horizontal connection uses 20# channel steel, which is welded in a "Z" shape and connected to the steel pipe columns 1 by butt welding. The connection center of the steel pipe columns of piers 7# to 11# is located in three layers in height. When the height of the column is greater than 10m near the pier body, the column and the pier body are equipped with attached walls. Starting from the top of the column, an attached wall is set every 9m below it (staggered 1m with the steel pipe column), and the embedded steel plate of the pier body is connected to the column by two L63×6mm angle steels to ensure the overall stability of the bracket.

[0072] Preferably, a discharging support 103 is provided between the steel pipe column 1 and the steel pipe top cross beam 3 of the present embodiment; the steel pipe top cross beam 3 is made of I56a I-beam.

[0073] Preferably, the load-bearing beam 4 of this embodiment is a 321-type Bailey frame; more specifically, the structure of this embodiment is that five groups of load-bearing beams 4 are arranged along the transverse direction of the bridge;

[0074] Two groups of load-bearing beams 4 are arranged near the transverse sides of the bridge, and one group of load-bearing beams 4 is arranged in the transverse middle of the bridge.

[0075] Preferably, the distribution beam 5 of this embodiment adopts 20# I-beam; the square timber structure between the distribution beam 5 and the box beam 11 includes a plurality of spaced timber squares 601, and the cross-sectional size of the timber squares 601 is 10cm*10cm, and the spacing between adjacent timber squares 601 is 20cm and / or 30cm; and a bamboo plywood with a thickness of 1.5cm laid on the upper surface of the square timber 601.

[0076] During construction, the ordinary steel bars of the cast-in-place continuous box beam were made using the 1# and 2# steel bar processing plants; the Bailey beam assembly sites were located in the open space next to the piers. According to the construction schedule, personnel were organized to enter the site. There were 102 workers in the continuous cast-in-place box beam construction. After entering the site, they built temporary projects, built access roads, leveled the site, solved the water and electricity problems for construction, prepared generators, and ensured that the road, water, electricity, and site were leveled. The foundation and substructure, brackets, and Bailey beam assembly were constructed.

[0077] The maximum height of the steel pipe column 1 in this embodiment is 28.49m to 39.755m, and it is set on a square independent foundation. The bracket foundation adopts a square C30 reinforced concrete independent foundation; the horizontal spacing of the steel pipe column 1 is 8.43m, and the vertical spacing is 6.15m. The transverse bridge direction adopts I56a I-beam full-length welding and fixation. The steel pipe column 1 and the square foundation are fixed by butt welding with embedded steel plates. In order to strengthen the stability of the steel pipe column 1, a triangular plate support is added at the end of the steel pipe column 1.

[0078] The steel pipes 101 of the remaining steel pipe columns 1 on the upper part of this embodiment are all bolted together by flanges 102 and reinforced with double nuts; the scissor braces between each row of steel pipes 101 are fixedly connected by welding with 20# channel steel.

[0079] In this embodiment, a double-jointed I56a I-beam horizontal distribution beam is set on the top of each row of steel pipe columns 1. The length of the I-beam exceeds the edge line of the flange plate and is temporarily fixed to the Bailey plate. The I-beams are fixed by splicing welding. The length of each weld is greater than 100mm, and the weld spacing is 500mm. In order to prevent the crossbeam from moving along the bridge, a groove is opened on the steel pipe pile, and the groove depth is not less than 200mm. At the same time, in order to prevent the crossbeam from moving horizontally, a triangular gusset plate is used at the notch position of each steel pipe pile and under the center line of the I-beam to fully weld the I-beam and the steel pipe pile.

[0080] The upper surface of the portion of the distribution beam 5 extending to the outside of the load-bearing beam 4 is paved with a bamboo plywood 602 with a thickness of 1.5 cm;

[0081] The guardrail structure includes:

[0082] There are multiple vertical poles 701 with horizontal and vertical spacing of 0.9m. A layer of 10cm*10cm square wood 601 is set on the top of the vertical poles 701 as the main keel, and multiple 10cm*10cm square wood 601 are arranged on the main keel at a spacing of 30cm as secondary keels, and a bamboo plywood 602 with a thickness of 1.5cm is laid.

[0083] The step distance of the operating platform 7 in this embodiment is 0.6 m.

[0084] The adjacent steel pipe columns 1 serve as a foundation for casting the bridge columns 10 .

[0085] In the above technical solution, a cast-in-situ box girder support structure provided by the present utility model has the following beneficial effects:

[0086] The support structure of the present utility model is mainly stressed by a concrete foundation, steel pipe columns, Bailey beams, I-beams, and wooden formworks. The stress analysis and calculation of each part are relatively simple, and it is easy to control the working stress conditions of various materials. The support has sufficient strength, stiffness, and stability, with a small settlement, ensuring the bridge alignment, the quality of the box girder 11, and the safety of construction personnel.

[0087] Only some exemplary embodiments of the present utility model have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present utility model.

Claims

1. Cast-in-place box girder support structure, characterized in that There are multiple groups of the support structures arranged along the longitudinal extension direction of the bridge. The support structures include: Steel pipe columns (1); A steel pipe top cross beam (3) provided at the upper end of the steel pipe columns (1) and extending along the transverse direction of the bridge. The length of the steel pipe top cross beam (3) is greater than the spacing between two steel pipe columns (1) so as to partially extend to the outside of the steel pipe columns (1). The steel pipe top cross beam (3) is made of I-beam; Multiple groups of load-bearing beams (4) provided on the upper surface of the steel pipe top cross beam (3). The load-bearing beams (4) extend along the longitudinal direction of the bridge, and multiple groups of the load-bearing beams (4) are arranged along the transverse direction of the bridge; and A distribution beam (5) provided on the upper surface of the load-bearing beam (4). A square wood structure is provided on the upper surface of the distribution beam (5). The box girder (11) is isolated from the distribution beam (5) through the square wood structure; Both ends of the distribution beam (5) of the support structure partially extend to the outside of the load-bearing beam (4), and guardrail structures are distributed at the parts where the distribution beam (5) extends to the outside of the load-bearing beam (4). An operation platform (7) for operators is formed by the guardrail structures and the distribution beam (5).

2. The cast-in-place box girder support structure according to claim 1, characterized in that, Each steel pipe column (1) is connected by multiple steel pipes (101); Adjacent steel pipes (101) are connected by flange plates (102); The diameter of the steel pipe (101) is 609 mm, and the wall thickness of the steel pipe (101) is 16 mm.

3. The cast-in-place box girder support structure according to claim 2, characterized in that, A steel pipe foundation (5) is provided at the lower end of the steel pipe column (1); The steel pipe foundation (5) is a sand bucket structure for the temporary support of the bridge. The sand bucket structure for the temporary support of the bridge includes: A support base cylinder (501) filled with dry fine sand (502) inside. Multiple M27 bolts (503) are arranged along the circumferential direction of the side wall of the support base cylinder (501); A support upper cylinder (504) partially located inside the support base cylinder (501) and pressing the internal dry fine sand (502). C30 concrete (505) is filled inside the support upper cylinder (504); The steel pipe column (1) passes through the support upper cylinder (504) and partially extends into the support base cylinder (501). The lower end of the steel pipe column (1) is positioned and fixed by multiple M27 bolts (503).

4. The cast-in-place box girder support structure according to claim 2, characterized in that, A horizontal bracing and cross bracing structure (2) is provided between adjacent steel pipe columns (1); The horizontal bracing and cross bracing structure (2) includes: A horizontal channel steel (201) extending in the horizontal direction and connected to adjacent two steel pipe columns (1); and An inclined channel steel (202) connected between the two horizontal channel steels (201); Both the horizontal channel steel (201) and the inclined channel steel (202) are made of 20# channel steel.

5. The cast-in-situ box girder support structure according to claim 2, characterized in that, A drop-off support (103) is provided between the steel pipe column (1) and the steel pipe top cross beam (3); The steel pipe top cross beam (3) is made of I56a I-beam.

6. The cast-in-place box girder support structure according to claim 1, wherein The load-bearing beam (4) is selected as a 321 type Bailey truss; Five groups of load-bearing beams (4) are arranged along the transverse direction of the bridge; Two sets of the load-bearing beams (4) are provided at positions close to the two lateral sides of the bridge, and one set of the load-bearing beams (4) is provided at the position in the middle of the bridge transversely.

7. The cast-in-situ box girder support structure according to claim 6, characterized in that, The distribution beam (5) is made of 20# I-beam; The square wood structure between the distribution beam (5) and the box girder (11) includes: Multiple square timbers (601) arranged at intervals, and the cross-sectional dimension of the square timber (601) is 10 cm * 10 cm, and the spacing between adjacent square timbers (601) is 20 cm and / or 30 cm; and The bamboo plywood (602) with a thickness of 1.5 cm laid on the upper surface of the square timber (601).

8. The cast-in-place box girder support structure according to claim 1 or 6, characterized in that, The bamboo plywood (602) with a thickness of 1.5 cm is laid on the upper surface of the part of the distribution beam (5) extending outside the load-bearing beam (4); The guardrail structure includes: Multiple vertical poles (701) with a lateral spacing and a longitudinal spacing of 0.9 m. A layer of square timber (601) with a size of 10 cm * 10 cm is arranged at the top of the vertical pole (701) as the main keel, and multiple square timbers (601) with a size of 10 cm * 10 cm are arranged on the main keel at a spacing of 30 cm as the secondary keels, and the bamboo plywood (602) with a thickness of 1.5 cm is laid.

9. The cast-in-situ box girder support structure according to claim 8, wherein, The step distance of the operation platform (7) is 0.6 m.

10. The cast-in-place box girder support structure according to claim 1, characterized in that, Adjacent steel pipe columns (1) serve as the pouring foundation of the bridge column (10).

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