Large cantilevered capping beam support system and construction method

Abstract

The present invention relates to a large cantilevered cap beam support system and a construction method, including a cap beam, a large height difference support system, a cap beam height difference adjustment support, a standardized pier column connector, a transverse underpass tunnel, a foundation, a standardized steel formwork, long steel pipe columns, and short steel pipe columns. For the construction of the large cantilevered cap beam support system, the foundation is constructed on the ground, long steel pipe columns and short steel pipe columns are installed on the foundation, and the long steel pipe columns and short steel pipe columns are fixed by upper horizontal beams, lower horizontal beams, and diagonal braces. The large height difference support system is connected and fixed to the pier column by a standardized pier column connector. Double-rolled steel beams are installed on the upper parts of the long steel pipe columns and short steel pipe columns, and a standardized steel formwork is installed on the upper parts of the double-rolled steel beams. The standardized steel formworks at both ends of the cap beam are adjusted by the cap beam height difference adjustment support. The present invention can effectively reduce the project cost and speed up the construction speed, and good technical and economic benefits can be obtained when applied to practical projects.

Description

Technical Field

[0001] The present invention belongs to the field of civil engineering, and particularly relates to a large cantilevered bent cap support system and a construction method thereof. Background Art

[0002] The construction of urban viaducts helps to alleviate traffic congestion and improve the development level of the city. In viaduct projects, the construction of bent caps can reduce the number of pier bodies and is a common structure of viaducts. The support is an important device in bent cap construction, and reasonable erection of the support is of great significance for improving the construction quality. During the construction process of bridge projects, the construction quality of bent caps has a very important impact on the subsequent installation of box girders and the entire construction progress. Due to the high construction height and high complexity of the process of bent cap construction, and involving a large number of cooperating mechanical templates, in actual construction links, it is often affected by some factors, which have an impact on construction safety and quality. The construction of traditional bent cap support systems has disadvantages such as difficult erection of supports with large height differences, low construction efficiency, and difficult adjustment of height differences at both ends of the bent cap. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a large cantilevered bent cap support system and a construction method thereof.

[0004] Such a large cantilevered bent cap support system includes a bent cap, a pier column, a large height difference support system, a bent cap height difference adjustment support, a standardized pier column connector, a transverse underpass tunnel, a foundation, the lower soil body, the upper soil body, a standardized steel formwork, and steel pipe columns. The steel pipe columns include long steel pipe columns and short steel pipe columns; the standardized steel formwork includes a bent cap side formwork and a bent cap bottom formwork;

[0005] The bottom of the pier column is supported on the lower soil body through pile foundations. Foundations are provided on both the lower soil body and the upper soil body. Long steel pipe columns are installed on the foundation on the lower soil body, and short steel pipe columns are installed on the foundation on the upper soil body. The large height difference support system is connected and fixed to the pier column through a standardized pier column connector. Double-spliced steel beams are installed on the upper parts of the long steel pipe columns and the short steel pipe columns. The large height difference support system is supported below the double-spliced steel beams. A standardized steel formwork is installed on the upper part of the double-spliced steel beams. Bent cap height difference adjustment supports are provided at the bottoms of the standardized steel formworks at both ends of the bent cap.

[0006] Preferably: Grouting reinforcement soil bodies are formed in the lower soil body and the upper soil body within a certain range around the foundation through grouting steel pipes. Scattered material backfill is provided above the grouting reinforcement soil bodies, and steel pipe column fixing steel plates are provided on the upper part of the foundation.

[0007] Preferably, the long steel pipe column and the short steel pipe column are fixed by an upper horizontal beam, a lower horizontal beam and inclined braces. A steel hoop is provided on the pier column, a bearing platform is provided at the bottom of the pier column, a pre-embedded steel plate is provided on the bearing platform, and a vertical fixed column and a steel hoop are fixed on the bearing platform through the pre-embedded steel plate. The upper and lower parts of the vertical fixed column are respectively fixed to the upper horizontal beam and the lower horizontal beam.

[0008] Preferably, an open steel pipe column is provided at the top of the steel pipe column. The open steel pipe column is connected to the steel pipe column through an embedded I-beam. The periphery of the embedded I-beam is fixed by anchoring steel bars, and the top of the embedded I-beam is fixed to the double-rolled steel beam through an anchoring steel plate.

[0009] Preferably, the cover beam height difference adjustment bracket includes a lower support frame, an upper support frame, an adjustment block and a jack. A lower support frame is provided at the lower part of the cover beam height difference adjustment bracket. The upper support frame is supported on the lower support frame through the adjustment block and the jack. An adjustment hinge shaft is provided at the bottom of the side form of the cover beam.

[0010] The construction method of this large cantilever cover beam support system structure includes the following steps:

[0011] Step 1, foundation construction: Excavate and pour concrete on the lower soil body and the upper soil body to form a foundation. A fixed steel plate for the steel pipe column is pre-embedded on the foundation, and the soil body around the foundation is backfilled with loose materials.

[0012] Step 2, installation of the support system: Install the steel pipe column on the foundation. The large height difference support system is fixed at the pier column position by a standardized pier column connector. The top of the steel pipe column is reinforced by an embedded I-beam, and a double-rolled steel beam is installed above the embedded I-beam.

[0013] Step 3, installation of the cover beam formwork: Lay the bottom formwork of the cover beam on the double-rolled steel beam, and use the cover beam height difference adjustment bracket to assist in fixing and adjusting the side formwork on both sides of the cover beam.

[0014] Step 4, cover beam construction: Install the cover beam steel bars and embedded parts, check the installation position of the standardized steel formwork, and carry out concrete pouring and curing of the cover beam.

[0015] Step 5, removal of the support: When the cover beam reaches the formwork removal condition, remove the large cantilever cover beam support system structure. First, remove the long steel pipe columns at both ends, and then remove the short steel pipe columns inside.

[0016] Preferably, in Step 1: After the foundation is poured, grouting is carried out in the lower soil body and the upper soil body within a certain range around the foundation by using grouting steel pipes to form a grouting-reinforced soil body.

[0017] Preferably, in step two: the steel pipe columns include long steel pipe columns and short steel pipe columns. Long steel pipe columns are installed on the foundation on the lower soil body, and short steel pipe columns are installed on the foundation on the upper soil body. The steel pipe columns are fixed by upper horizontal beams, lower horizontal beams and inclined supports.

[0018] The beneficial effects of the present invention are:

[0019] 1) Adopt a large height difference support system to construct the capping beam support under the condition of limited support erection conditions, improving the construction efficiency of the capping beam operation.

[0020] 2) Use standardized pier column connectors to fix the large height difference support system and the pier columns, improving the overall stability of the large height difference support system, and solving the problems of difficult support erection and low construction efficiency of the large height difference structure.

[0021] 3) Adopt a backfill structure with bulk materials to backfill the foundation, reducing the difficulty of subsequent foundation excavation and improving the construction efficiency.

[0022] 4) Use a capping beam height difference adjustment support to accurately adjust the installation position of the standardized steel formwork of the capping beam, improving the overall construction quality and construction efficiency of the capping beam, and solving the problem of difficult height difference adjustment at both ends of the capping beam. Description of the Drawings

[0023] Figure 1 is the structural diagram of the large cantilever capping beam support system;

[0024] Figure 2 is the structural diagram of the foundation;

[0025] Figure 3 is the structural diagram of the standardized pier column connector;

[0026] Figure 4 is the connection structural diagram at the top of the steel pipe column;

[0027] Figure 5 is the structural diagram of the capping beam height difference adjustment support.

[0028] In the figure: 1, capping beam; 2, pier column; 3, external diagonal brace; 4, upper horizontal beam; 5, diagonal brace; 6, lower horizontal beam; 7, short steel pipe column; 8, bearing platform; 9, long steel pipe column; 10, pile foundation; 11, foundation; 12, lower soil mass; 13, horizontally crossing tunnel; 14, upper ground surface; 15, standardized pier column connector; 16, large height difference support system; 17, double-rolled steel beam; 18, capping beam height adjustment support; 19, standardized steel formwork; 20, steel pipe column fixing steel plate; 21, backfill with loose materials; 22, grouting-reinforced soil mass; 23, grouting steel pipe; 24, steel hoop; 25, embedded steel plate; 26, vertically fixed column; 27, steel pipe column; 28, open steel pipe column; 29, anchoring steel bar; 30, anchoring steel plate; 31, embedded I-beam; 32, capping beam bottom formwork; 33, lower support frame; 34, upper support frame; 35, adjustment block; 36, jack; 37, adjustment hinge shaft; 38, capping beam side formwork. Specific implementation manners

[0029] The present invention will be further described below in conjunction with embodiments. The description of the following embodiments is only for helping to understand the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0030] Embodiment 1

[0031] As an embodiment, as Figures 1 to 5 shown, this large cantilever capping beam support system includes a capping beam 1, a pier column 2, a large height difference support system 16, a capping beam height adjustment support 18, a standardized pier column connector 15, a horizontally crossing tunnel 13, a foundation 11, a lower soil mass 12, an upper soil mass 14, a standardized steel formwork 19 and a steel pipe column 27. The steel pipe column 27 includes a long steel pipe column 9 and a short steel pipe column 7; the standardized steel formwork 19 includes a capping beam side formwork 38 and a capping beam bottom formwork 32;

[0032] As Figure 1 and Figure 2 shown, the bottom of the pier column 2 is supported on the lower soil mass 12 through a pile foundation 10. Foundations 11 are provided on both the lower soil mass 12 and the upper soil mass 14. A long steel pipe column 9 is installed on the foundation 11 on the lower soil mass 12, and a short steel pipe column 7 is installed on the foundation 11 on the upper soil mass 14. The long steel pipe column 9 and the short steel pipe column 7 are fixed by an upper horizontal beam 4, a lower horizontal beam 6 and a diagonal brace 5. The large height difference support system 16 is connected and fixed to the pier column 2 by a standardized pier column connector 15. A double-rolled steel beam 17 is installed on the upper parts of the long steel pipe column 9 and the short steel pipe column 7. The large height difference support system 16 is supported below the double-rolled steel beam 17. A standardized steel formwork 19 is installed on the upper part of the double-rolled steel beam 17. The standardized steel formworks 19 at both ends of the capping beam 1 are adjusted by the capping beam height adjustment support 18.

[0033] In the lower soil mass 12 and upper soil mass 14 within a certain range around the foundation 11, grouting reinforced soil mass 22 is formed through grouting steel pipes 23. Backfill 21 of loose materials is arranged above the grouting reinforced soil mass 22, and a steel pipe column fixing steel plate 20 is arranged above the foundation 11.

[0034] As Figure 3 shown, the long steel pipe column 9 and the short steel pipe column 7 are fixed through the upper horizontal beam 4, the lower horizontal beam 6 and the inclined support 5. A steel hoop 24 is arranged on the pier column 2, a bearing platform 8 is arranged at the bottom of the pier column 2, a pre-embedded steel plate 25 is arranged on the bearing platform 8, and a vertical fixed column 26 and the steel hoop 24 are fixed through the pre-embedded steel plate 25 on the bearing platform 8. The upper and lower parts of the vertical fixed column 26 are respectively fixed to the upper horizontal beam 4 and the lower horizontal beam 6.

[0035] As Figure 4 shown, an open steel pipe column 28 structure is arranged at the top of the steel pipe column 27. The open steel pipe column 28 structure is provided with an embedded I-beam 31 for the steel pipe column 27. Anchor bars 29 are arranged around the embedded I-beam 31 for fixation. An anchor steel plate 30 is arranged at the top of the embedded I-beam 31 and is fixed to the double-rolled steel beam 17.

[0036] As Figure 5 shown, the capping beam elevation adjustment support 18 includes a lower support frame 33, an upper support frame 34, an adjustment block 35 and a jack 36. The lower support frame 33 is arranged at the lower part of the capping beam elevation adjustment support 18. The adjustment block 35 and the jack 36 are arranged on the lower support frame 33 to adjust the position of the upper support frame 34. The position and angle of the capping beam side form 38 are adjusted by adjusting the position of the adjustment hinge shaft 37 of the standardized steel form 19.

[0037] Embodiment 2

[0038] As another embodiment, the construction method of the large cantilever capping beam support system structure proposed in Embodiment 1 includes the following steps:

[0039] Step 1. Foundation construction: Excavate and pour a concrete foundation 11 on the ground. A steel pipe column fixing steel plate 20 is pre-embedded on the foundation 11, and the soil around the foundation 11 is backfilled with loose materials 21;

[0040] Foundation reinforcement: After the foundation 11 is poured, grouting is carried out in the lower soil mass 12 and upper soil mass 14 within a certain range around the foundation 11 by using grouting steel pipes 23 to form a grouting reinforced soil mass 22.

[0041] Step 2, installation of the support system: install steel pipe columns 27 on the foundation 11, and the steel pipe columns 27 are fixed by upper horizontal beams 4, lower horizontal beams 6 and oblique supports 5. The large height difference support system 16 is fixed at the pier 2 position using standardized pier connectors 15. The top of the steel pipe column 27 is reinforced with embedded I-beams 31, and double-piece steel beams 17 are installed on the upper part of the embedded I-beams 31; the steel pipe columns 27 include long steel pipe columns 9 and short steel pipe columns 7. The long steel pipe columns 9 are installed on the foundation 11 on the lower soil body 12, and the short steel pipe columns 7 are installed on the foundation 11 on the upper soil body 14. The steel pipe columns 27 are fixed by upper horizontal beams 4, lower horizontal beams 6 and oblique supports 5.

[0042] Step 3: Installation of cap beam formwork: Lay the cap beam standardized bottom formwork on the double-piece steel beam 17, and use the cap beam height difference adjustment bracket 18 to assist in fixing and adjusting the cap beam side formwork 38 on both sides of the cap beam 1.

[0043] Step 4, cap beam construction: After the installation of the cap beam 1 steel bars and embedded parts is completed, check the installation position of the standardized steel formwork 19 in time, and carry out the cap beam 1 concrete pouring and maintenance.

[0044] Step 5, bracket removal: When the cap beam 1 reaches the demoulding conditions, the large cantilever cap beam bracket system structure is removed, first removing the long steel pipe columns 9 at both ends, and then removing the inner short steel pipe columns 7.

Claims

1. A large cantilevered capping beam support system structure, characterized in that: It includes a capping beam (1), a pier column (2), a large height difference support system (16), a capping beam height difference adjustment support (18), a standardized pier column connector (15), a transverse underpass tunnel (13), a foundation (11), a lower soil mass (12), an upper soil mass (14), a standardized steel formwork (19) and a steel pipe column (27), and the steel pipe column (27) includes a long steel pipe column (9) and a short steel pipe column (7); the standardized steel formwork (19) includes a capping beam side formwork (38) and a capping beam bottom formwork (32); The bottom of the pier column (2) is supported on the lower soil mass (12) through a pile foundation (10). Foundations (11) are provided on both the lower soil mass (12) and the upper soil mass (14). The long steel pipe column (9) is installed on the foundation (11) on the lower soil mass (12), and the short steel pipe column (7) is installed on the foundation (11) on the upper soil mass (14). The large height difference support system (16) is connected and fixed to the pier column (2) through the standardized pier column connector (15). A double-rolled steel beam (17) is installed on the upper parts of the long steel pipe column (9) and the short steel pipe column (7). The large height difference support system (16) is supported below the double-rolled steel beam (17). The standardized steel formwork (19) is installed on the upper part of the double-rolled steel beam (17). Capping beam height difference adjustment supports (18) are provided at the bottoms of the standardized steel formworks (19) at both ends of the capping beam (1); In a certain range around the foundation (11), grouting reinforcement soil bodies (22) are formed in the lower soil mass (12) and the upper soil mass (14) through grouting steel pipes (23). A granular material backfill (21) is arranged above the grouting reinforcement soil bodies (22). A steel pipe column fixing steel plate (20) is arranged on the upper part of the foundation (11); The long steel pipe column (9) and the short steel pipe column (7) are fixed through an upper horizontal beam (4), a lower horizontal beam (6) and a diagonal brace (5). A steel hoop (24) is arranged on the pier column (2). A bearing platform (8) is provided at the bottom of the pier column (2). An embedded steel plate (25) is arranged on the bearing platform (8). A vertical fixing column (26) and a steel hoop (24) are fixed on the bearing platform (8) through the embedded steel plate (25). The upper and lower parts of the vertical fixing column (26) are respectively fixed to the upper horizontal beam (4) and the lower horizontal beam (6).

2. The large cantilevered coping beam support system structure according to claim 1, characterized in that: An open steel pipe column (28) is arranged at the top of the steel pipe column (27). The open steel pipe column (28) is connected to the steel pipe column (27) through an embedded I-beam (31). The periphery of the embedded I-beam (31) is fixed through anchoring steel bars (29). The top of the embedded I-beam (31) is fixed to the double-rolled steel beam (17) through an anchoring steel plate (30).

3. The large cantilevered capping beam support system structure according to claim 1, characterized in that: The capping beam height difference adjustment support (18) includes a lower support frame (33), an upper support frame (34), an adjustment block (35) and a jack (36). The lower support frame (33) is arranged at the lower part of the capping beam height difference adjustment support (18). The upper support frame (34) is supported on the lower support frame (33) through the adjustment block (35) and the jack (36). An adjustment hinge shaft (37) is provided at the bottom of the capping beam side formwork (38).

4. The construction method of the large cantilever capping beam support system structure according to any one of claims 1 to 3, characterized in that, It includes the following steps: Step 1. Foundation construction: Excavate and pour concrete on the lower soil mass (12) and the upper soil mass (14) to form the foundation (11). Embed steel pipe columns in the foundation (11) to fix the steel plate (20), and backfill the soil around the foundation (11) with granular materials (21). Step 2. Installation of the support system: Install steel pipe columns (27) on the foundation (11). The large height difference support system (16) is fixed at the position of the pier column (2) by using standardized pier column connectors (15). The top of the steel pipe column (27) is reinforced by embedding an I-beam (31), and a double-rolled steel beam (17) is installed above the embedded I-beam (31). Step 3. Installation of the cap beam formwork: Lay the bottom formwork (32) of the cap beam on the double-rolled steel beam (17), and use the cap beam height difference adjustment support (18) to assist in fixing and adjusting the formwork on both sides of the cap beam (1). Step 4. Construction of the cap beam: Install the steel bars and embedded parts of the cap beam (1), check the installation position of the standardized steel formwork (19), and pour and cure the concrete of the cap beam (1). Step 5. Demolition of the support: When the cap beam (1) reaches the formwork removal condition, demolish the structure of the large cantilever cap beam support system. First, demolish the long steel pipe columns (9) at both ends, and then demolish the short steel pipe columns (7) inside.

5. The construction method of the large cantilever capping beam support system structure according to claim 4, characterized in that, In Step 1: After the foundation (11) is poured, grout the lower soil mass (12) and the upper soil mass (14) within a certain range around the foundation (11) by using grouting steel pipes (23) to form the grouted and reinforced soil mass (22).

6. The construction method of the large cantilevered capping beam support system structure according to claim 4, characterized in that, In Step 2: The steel pipe columns (27) include long steel pipe columns (9) and short steel pipe columns (7). Long steel pipe columns (9) are installed on the foundation (11) on the lower soil mass (12), and short steel pipe columns (7) are installed on the foundation (11) on the upper soil mass (14). The steel pipe columns (27) are fixed by the upper horizontal beam (4), the lower horizontal beam (6) and the diagonal bracing (5).

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