CN211947993U - Support for large-span cast-in-situ bridge construction - Google Patents

Abstract

The utility model is a support for large-span cast-in-place bridge construction, which belongs to the field of bridge construction and aims to solve the problems of poor stability of the existing support and inconvenient adjustment of longitudinal and transverse slopes. Including the foundation, the steel tube column set on the foundation and the steel platform supported on the top of the steel tube column; the foundation includes the cap and pile foundation set at the position of the pier column and the strip set at the mid-span position of the two adjacent pier columns Foundation; along the longitudinal direction of the bridge, the steel tube columns are connected by longitudinal horizontal support frames; along the horizontal direction of the bridge, the adjacent steel tube columns are connected by horizontal horizontal support frames; on the steel platform, there is a full-scale scaffolding. The utility model adopts the structure of steel pipe piles, steel platforms and full hall scaffolding, and the longitudinal slope and transverse slope are adjusted by the full hall scaffolding, so that the steel platform can always be in a horizontal state, with good mechanical properties, safety and reliability. By supporting the steel platform at the mid-span position, the deflection of the steel platform is reduced and the overall stability of the bracket is improved.

Description

Brackets for construction of large-span cast-in-place bridges

technical field

The utility model belongs to the field of bridge construction, in particular to a support for large-span cast-in-place bridge construction.

Background technique

With the continuous construction of infrastructure in our country, the cast-in-place continuous box girder technology is more and more widely used in municipal bridges and highway bridge projects. The construction terrain of individual bridges is complex. If the traditional cast-in-place full house support system construction technology is used in the construction process, the investment will be large. , High cost, long construction period and great safety risk. If the steel pipe piles are constructed with combined supports, the construction period can be further reduced and costs can be saved. At present, the steel pipe pile composite support is usually based on the pier cap, and the steel tube column is set on the pier cap, and the Bailey beam is set on the top of the steel pipe column, and the concrete box girder is poured through the Bailey beam support. However, this structure has the following disadvantages:

First of all, for this structure, for ultra-high structures, the height of steel pipe columns is high, and the stability requirements of steel pipe piles are low; for structures with large spans between adjacent piers, Bailey beams have large deflection and poor stability. ;

Second, if the bridge has vertical and horizontal slopes, there is a great risk of horizontal slippage in the adjustment of the top elevation of the steel pipe piles. It is necessary to adjust the height of the steel pipe columns. The entire vertical and horizontal slopes cannot be guaranteed. In the presence of horizontal thrust, the entire Bailey beam system will appear horizontal slip phenomenon.

Utility model content

The purpose of the utility model is to provide a large-span cast-in-place bridge construction support, which solves the problems of poor stability of the existing support and inconvenient adjustment of longitudinal and transverse slopes.

The technical scheme adopted by the utility model is: a large-span cast-in-place bridge construction support includes a foundation, a steel pipe column arranged on the foundation and a steel platform supported on the top of the steel pipe column; the foundation includes a bearing set at the position of the pier column. Platforms and pile foundations and strip foundations set at the mid-span position of two adjacent piers;

Along the longitudinal direction of the bridge, the steel pipe columns are connected by longitudinal horizontal support frames; along the horizontal direction of the bridge, the adjacent steel pipe columns are connected by horizontal horizontal support frames;

A full house scaffolding is erected on the steel platform.

Further, steel plates are pre-embedded on the support platform and the strip foundation, the bottom ends of the steel pipe columns are welded and connected with the steel plates, and several stiffening plates are evenly arranged around the outer circumference of the steel pipe columns.

Further, the steel platform includes a bottom distribution beam, a Bailey beam and a top distribution beam;

The bottom distribution beam is fixedly connected to the top of the steel pipe column;

The Bailey beam is supported on the bottom distribution beam, and, along the longitudinal direction of the bridge, the bottom distribution beam is located at the splicing position of two adjacent Bailey beams, and is arranged along the horizontal length of the bridge;

The top distribution beam is supported on the top of the Bailey beam, and, along the longitudinal direction of the bridge, the top distribution beam is provided at the splicing place of two adjacent Bailey beams, and the top distribution beam extends along the transverse direction of the bridge. set up.

Further, at the position of the pier column, the bottom distribution beam is two I-beams arranged side by side, and the two I-beams are symmetrical about the center line of the Bailey beam splicing joint; Position, the bottom distribution beam is three I-beams arranged side by side, and the three I-beams are symmetrical about the center line of the Bailey beam splicing joint.

Further, a U-shaped bolt is arranged between the Bailey beam and the bottom distribution beam, one end of the U-shaped bolt passes through the lower chord of the Bailey beam and the nut is engaged, and the other end passes through the adjacent Bailey beam. The lower chord is engaged with the nut, and the bottom distribution beam is accommodated in the enclosing area of the lower chord of the Bailey beam and the U-bolt.

Further, a bottom bracket and a pulley are arranged at the bottom of the scaffold; the scaffold is erected by a steel pipe; the bottom bracket is arranged at the bottom end of the steel pipe and is movably connected with the steel pipe in the vertical direction; At least two bottom brackets are arranged between the two adjacent pulleys, and the height of the pulleys is equal to or higher than the height of the bottom bracket after the limit extension.

The beneficial effects of the utility model are as follows: the utility model adopts the structure of steel pipe piles and steel platforms to fill the hall scaffolding, and the longitudinal slope and transverse slope are adjusted by the full hall scaffolding, so that the steel platform can always be in a horizontal state, with good mechanical properties and safety. reliable.

By supporting the steel platform at the mid-span position, the deflection of the steel platform is reduced and the overall stability of the bracket is improved.

Through the setting of pulleys and bottom brackets at the bottom of the scaffolding, the scaffolding can be translated as a whole, reducing the workload and time for erecting the scaffolding.

Description of drawings

Fig. 1 is the front view of the utility model;

Fig. 2 is the left side view of the utility model;

Fig. 3 is a partial enlarged view of Fig. 1;

Figure 4 is a schematic diagram of the connection between the Bailey beam and the bottom distribution beam;

Figure 5 is a front view of the bottom structure of the scaffold;

Figure 6 is a left side view of the bottom structure of the scaffold.

In the figure, pile foundation 1, cap 2, strip foundation 3, steel pipe column 4, vertical horizontal support frame 5, horizontal horizontal support frame 6, steel plate 7, stiffening plate 8, bottom distribution beam 9, Bailey beam 10, top Distribution beam 11 , U-bolt 12 , nut 13 , lower chord 14 , scaffold 15 , pulley 16 , bottom bracket 17 .

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the utility model is further described as follows:

The large-span cast-in-place bridge construction supports, as shown in Figure 1, Figure 2 and Figure 3, include a foundation, a steel pipe column 4 arranged on the foundation and a steel platform supported on the top of the steel pipe column 4; the foundation includes a pier arranged on a pier The bearing platform 2 and the pile foundation 1 at the column position and the strip foundation 3 arranged at the mid-span position of the two adjacent piers; along the longitudinal direction of the bridge, the longitudinal horizontal support frame 5 is used to connect each steel tube column 4; Along the transverse direction of the bridge, the adjacent steel tube columns 4 are connected by a horizontal horizontal support frame 6; a full-house scaffolding 15 is erected on the steel platform.

The disclosed large-span cast-in-situ bridge construction bracket of the present invention adopts the strip foundation 3 at the mid-span position of two adjacent piers, and the strip foundation 3 is provided with a steel pipe column 4, so that not only the piers are located at the position of the piers, the , and also supports the steel platform at the mid-span position, which reduces the deflection of the steel platform and improves the overall stability of the bracket. By erecting the full-floor scaffolding 15 on the steel platform, firstly, it is beneficial to shorten the height of the steel pipe column 4 and improve the stability of the steel pipe column 4; , it can be adjusted through the full house scaffold 15, and the adjustment is convenient, safe and reliable. Through the arrangement of the vertical horizontal support frame 5 and the horizontal horizontal support frame 6, each steel pipe column 4 is connected together, the rigidity of the steel pipe column 4 is improved, and the overall stability of the bracket is ensured. In this embodiment, for steel pipe piles with a height of more than 20m, a vertical horizontal support frame 5 and a horizontal horizontal support frame 6 need to be added every 8m as horizontal supports.

In order to facilitate the connection between the foundation and the steel pipe column 4 , preferably, a steel plate 7 is pre-embedded on the cap 2 and the strip foundation 3 , and the bottom end of the steel pipe column 4 is welded to the steel plate 7 and surrounds the outer circumference of the steel pipe column 4 Several stiffening plates 8 are evenly arranged.

The steel pipe column 4 is made of multi-section splicing. The first steel pipe column 4 is used as an elevation adjustment section, and the height and verticality must be well controlled. The first steel pipe column 4 is welded with the embedded steel plate 7, and 8 stiffening plates 8 are added. ; For the second section and above, the 4-section of the steel pipe column adopts the standard section, the connection adopts the flange connection, and the connecting bolts are not less than 8.

In order to further ensure the stability of the structure, preferably, the steel platform includes a bottom distribution beam 9, a Bailey beam 10 and a top distribution beam 11; the bottom distribution beam 9 is fixedly connected to the top of the steel pipe column 4; the Bailey beam 10 is supported on the bottom distribution beam 9, and, along the longitudinal direction of the bridge, the bottom distribution beam 9 is located at the splicing place of the adjacent two Bailey beams 10, and is arranged along the horizontal length of the bridge; the top distribution beam 11 is supported on the shell The top of the thunder beam 10, and along the longitudinal direction of the bridge, is provided with the top distribution beam 11 at the splicing position of the adjacent two Bailey beams 10, and the top distribution beam 11 is provided along the horizontal length of the bridge.

In order to make the supporting strength of the Bailey beam 10 to be consistent everywhere, preferably, at the position of the pier, the bottom distribution beam 9 is two I-beams arranged side by side, and the two I-beams are about the Bailey. The midline of the spliced joint of the beam 10 is symmetrical; at the mid-span position of two adjacent piers, the bottom distribution beam 9 is three I-beams arranged side by side, and the three I-beams are symmetrical about the midline of the spliced joint of the Bailey beam 10 . By arranging three I-beams in the midspan to support the Bailey beam 10, it is more beneficial to reduce the deflection of the Bailey beam 10.

As shown in FIG. 4 , a U-shaped bolt 12 is arranged between the Bailey beam 10 and the bottom distribution beam 9, and one end of the U-shaped bolt 12 passes through the lower chord 14 of the Bailey beam 10 and is engaged with the nut 13, The other end passes through the lower chord 14 of the adjacent Bailey beam 10 and is engaged with the nut 13 .

The bottom distribution beam 9 and the lower chord 14 of the Bailey beam 10 are connected by the U-shaped bolts 12, so that there is no need to process installation holes on the bottom distribution beam 9 or the Bailey beam 10, and it is also convenient for the bottom distribution beam 9 and the Bailey beam 10. disassembly.

In order to facilitate the overall pushing of the scaffolding 15, preferably, as shown in Figures 5 and 6, a bottom bracket 17 and a pulley 16 are provided at the bottom of the scaffolding 15; the scaffolding 15 is erected by a steel pipe; The bottom end is movably connected with the steel pipe in the vertical direction; the pulley 16 is installed at the bottom end of the steel pipe, at least two bottom brackets 17 are arranged between two adjacent pulleys 16, and the height of the pulley 16 is flush with Or higher than the height at which the bottom bracket 17 is located after the ultimate extension.

In this structure, when in use, the bottom bracket 7 is extended and supported on the top distribution beam 11 . When the half-width construction is completed and the other half-width construction needs to be carried out, the bottom bracket 7 is retracted, so that the bottom bracket 7 is lifted away from the top distribution beam 11, the pulley 16 is still supported on the top distribution beam 11, and then the top distribution beam 11 is used as a track, Along the extension direction of the top distribution beam 11, push the full-house scaffolding 15 to the other half for construction. Therefore, the whole scaffolding 15 can be moved from left to right to another or the next working section for use, and the steel pipe piles can be reused and transferred to the next working face. During the transfer process, the workload is reduced and the time is shortened.

Claims (6)

1. The support for the construction of the large-span cast-in-place bridge comprises a foundation, a steel pipe column (4) arranged on the foundation and a steel platform supported at the top end of the steel pipe column (4); the method is characterized in that:

the foundation comprises a bearing platform (2) and a pile foundation (1) which are arranged at the positions of the pier columns, and a strip foundation (3) which is arranged at the midspan position of two adjacent pier columns; the steel pipe columns (4) are connected by adopting a longitudinal horizontal support frame (5) along the longitudinal direction of the bridge; the adjacent steel pipe columns (4) are connected by adopting a transverse horizontal support frame (6) along the transverse direction of the bridge; and a full scaffold (15) is erected on the steel platform.

2. The support for the construction of the large-span cast-in-place bridge according to claim 1, wherein: steel plates (7) are pre-embedded in the bearing platform (2) and the strip foundation (3), the bottom end of the steel pipe column (4) is connected with the steel plates (7) in a welding mode, and a plurality of stiffening plates (8) are uniformly arranged around the periphery of the steel pipe column (4).

3. The support for the construction of the large-span cast-in-place bridge according to claim 1 or 2, wherein: the steel platform comprises a bottom distribution beam (9), a Bailey beam (10) and a top distribution beam (11);

the bottom distribution beam (9) is fixedly connected to the top of the steel pipe column (4);

the Bailey beams (10) are supported on the bottom distribution beams (9), and the bottom distribution beams (9) are positioned at the splicing positions of two adjacent Bailey beams (10) along the longitudinal direction of the bridge and are arranged along the transverse full length of the bridge;

the top distribution beams (11) are supported at the tops of the Bailey beams (10), the top distribution beams (11) are arranged at the splicing positions of two adjacent Bailey beams (10) along the longitudinal direction of the bridge, and the top distribution beams (11) are arranged along the transverse full length of the bridge.

4. The support for the construction of the large-span cast-in-place bridge according to claim 3, wherein: at the position of the pier stud, the bottom distribution beam (9) is two I-shaped steels arranged side by side, and the two I-shaped steels are symmetrical about the central line of a splicing joint of the Bailey beam (10); at the midspan position of two adjacent pier studs, the bottom distribution beam (9) is three I-beams arranged side by side, and the three I-beams are symmetrical about the center line of the splicing joint of the Bailey beam (10).

5. The support for the construction of the large-span cast-in-place bridge according to claim 3, wherein: a U-shaped bolt (12) is arranged between the Bailey beam (10) and the bottom distribution beam (9), one end of the U-shaped bolt (12) penetrates through a lower chord (14) of the Bailey beam (10) to be combined with a nut (13), the other end of the U-shaped bolt (12) penetrates through a lower chord (14) of an adjacent Bailey beam (10) to be combined with a nut (13), and the bottom distribution beam (9) is accommodated in an enclosed area of the lower chord (14) of the Bailey beam (10) and the U-shaped bolt (12).

6. The support for the construction of the large-span cast-in-place bridge according to claim 1 or 2, wherein: a bottom support (17) and a pulley (16) are arranged at the bottom of the scaffold (15); the scaffold (15) is formed by erecting steel pipes; the bottom support (17) is arranged at the bottom end of the steel pipe and is movably connected with the steel pipe along the vertical direction; the pulleys (16) are arranged at the bottom ends of the steel pipes, at least two bottom supports (17) are arranged between every two adjacent pulleys (16), and the heights of the pulleys (16) are flush with or higher than the height of the bottom supports (17) after the bottom supports are extended to the limit.

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