CN103469735A - Method for mounting curve ultrahigh hollow column plate type pier top solid section template - Google Patents

Abstract

The invention discloses a method for installing the formwork for the solid section of the pier top of a curved superhigh hollow column-slab bridge pier. The steel structure is connected to the outer side of the vertical stiff frame in the pier; the corbel support system is fixed on the inner side of the vertical stiff frame near the outer platform of the pier; the steel frame support structure is fixed above the corbel support system, and the prefabricated steel The truss is hoisted to the steel frame support structure, and the concrete cover plate is connected above the steel truss to form the installation platform for the formwork of the solid section of the top of the pier; finally, the formwork of the solid section of the top of the pier is supported on the installation platform, and then the formwork of the solid section of the top of the pier is supported by the tension bolts It is connected with the horizontal stiff frame and the vertical stiff frame in the pier, and forms a whole. The installation method of the invention is not limited by the construction site, is safe, economical and practical, can realize the transition from the hollow section on the top of the pier to the solid section, and has better force integrity.

Description

The installation method of the formwork of the solid section of the pier top of the hollow column and slab pier with curved superelevation

technical field

The invention belongs to the technical field of bridge pier building construction, and in particular relates to a method for installing a formwork for the solid section of the pier top.

Background technique

For most bridges with a height of less than 50m, the piers are mostly solid piers, and the solid bridge piers are generally used to support, distribute and transfer the load of the superstructure by setting the cover beam; Set up scaffolding to solve the vertical load-bearing problem.

In the construction of bridges across large deep valleys, it is sometimes necessary to build high piers over 100 meters. In order to reduce the load brought by the self-weight of the pier to the foundation, the pier adopts a thin-walled hollow column-slab type. Compared with parabolic thin-walled hollow column-slab piers Solid bridge piers have the characteristics of small cross-sectional area, large section modulus, light weight, and good structural rigidity and strength. This type of bridge pier can form a plastic hinge at an ideal position under rare earthquakes, consume seismic energy, and protect the safety of the main pier column and foundation. However, in the construction of the solid section of the pier top of this type of pier, if the traditional construction method is used, it will bring a lot of construction inconvenience, such as: (1) the inner space of the solid section of the pier top is narrow when the curved pier is used; (2) Since the height of this type of pier exceeds 100 meters, the concrete volume of the solid section and the box girder on the top of the pier is relatively large, so there is a higher requirement for the strength of the support. Therefore, a new method is needed in the construction of such piers to meet the strength requirements and achieve economical and practical purposes.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a safe, economical and practical bridge pier bridge that is not restricted by the construction site, can realize the transition from the hollow section of the pier top to the solid section, and has better stress integrity. Curve (eg 1.6 degree parabola) ultra-high type (even above 100m) hollow column slab pier top solid section formwork installation method.

In order to solve the above-mentioned technical problems, the technical solution proposed by the present invention is a method for installing the formwork for the solid section of the pier top of a curved super-high hollow column slab pier, including the following steps:

(1) Set up a working platform on both sides of the outer platform of the pier below the solid section of the pier top, and the bottom of the outer platform of the pier is connected to the outside of the vertical stiff skeleton in the pier through a steel structure to form a stressed whole;

(2) A corbel support system is respectively fixed on the inner side of the vertical stiff skeleton near the outer platform of the pier;

(3) Fix the steel frame support structure above the corbel support system, then hoist the prefabricated steel truss to the steel frame support structure to connect it with the steel frame support structure, and then cover the prefabricated concrete The slab is connected above the steel truss to form the installation platform for the formwork of the solid section of the pier top;

(4) Finally, support the formwork of the solid section of the top of the pier on the installation platform, and then connect it to the horizontal and vertical stiff frames in the pier through pull bolts to form a whole.

In the installation method of the above-mentioned formwork for the solid section of the top of the curved hollow column-slab bridge pier, preferably, in the step (1), the steel structure connecting the bottom of the outer platform of the pier and the vertical stiff skeleton in the pier includes channel steel and Rebar and channel steel are arranged obliquely, the top of which supports the outer platform of the pier, and the bottom end is connected to one end of rebar; the rebar passes through the pier and is fixed to the vertical rigid frame in the pier.

In the installation method of the solid section formwork of the above-mentioned curved super-high type hollow column slab pier pier top, preferably, in the step (2), the corbel support system includes pre-embedded I-beam and corbel, and the concrete steel formwork on the inner side of the bridge pier Before that, the pre-embedded I-beam was fixed to the vertical stiff frame in the pier, and then the corbel was connected to the pre-embedded I-beam through the anchor plate. connect.

In the installation method of the above-mentioned formwork for the solid section of the top of the curved super-high hollow column-slab bridge pier, preferably, in the step (2), the pre-embedded I-beam and the vertical stiff skeleton on one side are connected by a weld, and the pre-embedded The buried I-beam and the anchor plate on the other side are fixed through welds, and the welds are double fillet welds.

In the installation method of the above-mentioned solid section formwork of the super-high curved hollow column-slab pier pier top, preferably, in the step (3), the steel frame support structure includes a longitudinal I-beam arranged above the corbel, and a The steel beams on the beams and the longitudinal distribution steel beams arranged on the steel beams, the steel trusses are hoisted above the longitudinal distribution steel beams of the steel frame support structure, and connected with the longitudinal distribution steel beams through fasteners.

In the installation method of the above-mentioned solid section formwork of the super-high curved hollow column-slab pier pier top, preferably, in the step (3), the size of the cover plate is larger than the upper size of the steel truss, and the two sides of the cover plate are provided with pre-buried Bolts and I-beam embedded parts, when the formwork concrete of the solid section of the pier top is to be poured, the cover plate and the solid section are connected as a whole, and connected with the steel truss through the embedded bolts.

Compared with the prior art, the advantage of the present invention is that the method of the present invention fully considers the characteristics of the narrow construction space of the solid section of the pier top of the super-high curved pier, the large volume of concrete poured at one time, and the high requirement for the strength of the support system. On the top of the pier, the operation platform, corbel support system, steel frame support structure, steel truss and installation platform are erected in sequence, and the transition from the hollow section of the pier top to the solid section of the curved super-high hollow column-slab pier and similar configuration piers is well realized. transition, and make the solid section of the pier top and the box girder on the top of the pier form a stressed whole. The installation method of the present invention not only facilitates the construction and lifting, but also improves the strength. At the same time, the present invention cleverly uses the support system composed of various forms of steel structure beams. Compared with the conventional concrete beam support structure, it not only reduces the self-weight, At the same time, it is easy to disassemble. The installation method of the present invention well solves the construction technical problems such as the narrow construction space of the solid section of the pier top of the curved pier, the large volume of one-time poured concrete, and the high requirements for the strength and stability of the support, and achieves safe, economical and practical construction purposes , and can be widely used in the construction of the solid section of the top of the pier with super-high curves.

Description of drawings

Fig. 1 is a schematic diagram of the overall front view structure of the installation of the solid section formwork on the top of the pier of the curved super-high hollow column slab pier in the embodiment of the present invention.

Fig. 2 is a partial front view of the installation of the formwork for the solid section of the pier top of the curved super-high hollow column slab pier in the embodiment of the present invention.

Fig. 3 is a partial top view of the installation of the formwork of the solid section of the top of the pier of the curved super-high hollow column slab pier in the embodiment of the present invention.

Fig. 4 is a schematic diagram of the connection between the formwork of the solid section of the top of the pier and the box girder on the top of the pier of the super-high curved hollow column-slab pier in the embodiment of the present invention (front view).

illustration:

1. Pier column; 2. Vertical stiff frame; 3. Transverse stiff frame; 4. Platform outside the pier; 5. Working platform; 6. Finished rebar; 7. Channel steel; ;9. Anchor plate; 10. Corbel; 11. Steel beam; 12. Longitudinal distribution steel beam; 13. Steel truss; 14. Cover plate; beam.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

Example:

A method for installing the formwork for the solid section of the top of a curved superhigh hollow column-slab pier pier as shown in Figures 1 to 4, comprising the following steps:

(1) Use I18 I-beam (or other small steel) on both sides of the pier outer platform 4 below the solid section of the top of the pier as shown in Figure 2, and lay scaffolding boards on the top to form a working platform 5, and the bottom of the pier outer platform 4 The steel structure is connected to the outer side of the vertical stiff frame 2 in the pier column 1 (the vertical stiff frame 2 adopts 20a channel steel) to form a stressed whole; The steel structure of the stiff skeleton 2 includes channel steel 7 and finish-rolled rebar 6, the channel steel 7 is arranged obliquely, the top end supports the outer platform 4 of the pier, and the bottom end is connected to one end of the finish-rolled rebar 6; the finish-rolled rebar 6 bolts pass through The pier column 1 of the bridge pier is fixedly connected to the vertical rigid frame 2, so that the outer platform 4 of the pier is connected with the bridge pier as a whole, so as to ensure the safety of the working platform 5 on the upper part of the outer platform 4 .

(2) A corbel support system is respectively fixed on the inner side of the vertical stiff skeleton 2 near the outer platform 4 of the pier. As shown in Figure 2, the corbel support system includes pre-embedded I-beam 8, anchor plate 9 (the anchor plate 9 is a thick steel plate of 14 mm to 16 mm) and corbel 10. When designing the position with the anchor plate 9, the embedded I-beam 8 is fixed to the vertical stiff skeleton 2 in the bridge pier before closing the concrete steel formwork inside the bridge pier, and then the corbel 10 is connected to the embedded steel formwork through the anchor plate 9. The I-beam 8 is connected, and the anchor plate 9 on the lower side of the corbel 10 is connected to the pier column 1 and the vertical stiff skeleton 2 through the precision-rolled rebar 6 bolts. The pre-embedded I-beam 8 and the vertical stiff skeleton 2 on one side are connected by welds, and the pre-embedded I-beam 8 and the anchor plate 9 on the other side are also fixed by welds, using double fillet welds. And the weld seam height is taken as 10mm; the other side of the anchor plate 9 is welded with a corbel 10, and the corbel 10 is anchored into the pier 1 by 10cm.

(3) As shown in Figure 2 and Figure 3, when the concrete of the pier column 1 below the solid section of the pier top reaches the design strength, the inner mold of the pier body is removed, and the steel frame support structure is fixed above the corbel support system, and then the prefabricated A good steel truss 13 is hoisted to the steel frame support structure to be connected with the steel frame support structure. The steel frame supporting structure of the present embodiment comprises a longitudinal I-beam arranged above the corbel 10, a steel crossbeam 11 positioned on the longitudinal I-beam and a group of longitudinal distribution steel beams 12 arranged on the steel crossbeam 11, the steel crossbeam The left and right sides of 11 are connected to the corbel 10 through two vertical I-beams (I36a). In order to ensure the overall stability of the steel frame support structure, a longitudinal distribution steel beam 12 is set above the steel beam 11 so that the steel beam 11 is evenly stressed , The steel beam 11 and the longitudinal distribution steel beam 12 are all made of I36a I-beam (generally, the materials of the two need to be the same). After the installation of the steel frame support structure is completed, the prefabricated and assembled Q345 steel truss 13 is hoisted above the longitudinal distribution steel beam 12 of the steel frame support structure. are connected by bolts. Then the prefabricated concrete cover plate 14 is hoisted to the top of the steel truss 13 and connected to the steel truss 13 to form an installation platform for the formwork of the solid section of the top of the pier. The prefabricated concrete grade of the cover plate 14 is not lower than C35. The size of the cover plate 14 is larger than that of the upper part of the steel truss 13. The two sides of the cover plate 14 are equipped with embedded bolts and I20a I-beam embedded parts with a length of 70 cm. The exposed 40 cm is ready to be poured. When the formwork concrete is used for the solid section of the pier top, the cover plate 14 is connected to the solid section as a whole, and connected to the steel truss 13 through embedded bolts. More than 70% of the strength can be hoisted. The cover plate 14, as a part of the solid section of the pier top, does not need to be dismantled.

(4) Finally, the solid section formwork 16 of the pier top is supported on the pier column 1 and the installation platform, and then connected with the horizontal stiffening frame 3 and the vertical stiffening frame 2 in the pier by pulling the bolts 15, and form a whole. As shown in Figure 4, on the left and right sides of the top of the solid section template 16, I36a I-beams are arranged vertically and horizontally, as the part connecting with the box girder 17 on the pier top. The solid segment formwork 16 is connected.

Figure 1 is a schematic diagram of the overall structure of the installation of the solid section formwork on the pier top of the super-high curved hollow column slab pier in this embodiment. When the pier is constructed to the bottom pier column 1 of the solid section on the pier top, the solid section formwork 16 Standing on the pier column 1, and setting the structural system of this embodiment so that the solid section template 16 and the pier column 1 form a stressed whole. As shown in Figure 4, during the construction of the pier top box girder 17, the stress system at the bottom of the pier top box girder 17 can be formed by embedding shaped steel brackets. Body fixed.

Claims (6)

1. An installation method for the solid section formwork on the top of a hollow column-slab bridge pier with a super-high curve, comprising the following steps: (1) Set up a working platform on both sides of the outer platform of the pier below the solid section of the pier top, and the bottom of the outer platform of the pier is connected to the outside of the vertical stiff skeleton in the pier through a steel structure to form a stressed whole; (2) A corbel support system is respectively fixed on the inner side of the vertical stiff skeleton near the outer platform of the pier; (3) Fix the steel frame support structure above the corbel support system, then hoist the prefabricated steel truss to the steel frame support structure to connect it with the steel frame support structure, and then cover the prefabricated concrete The slab is connected above the steel truss to form the installation platform for the formwork of the solid section of the pier top; (4) Finally, support the formwork of the solid section of the top of the pier on the installation platform, and then connect it to the horizontal and vertical stiff frames in the pier through pull bolts to form a whole. 2. The method for installing the formwork for the solid section of the top of the pier with super-high curved hollow column and slab pier according to claim 1, characterized in that: in the step (1), the bottom of the outer platform of the connecting pier and the vertical stiffness of the middle of the pier The steel structure of the skeleton includes channel steel and rebar. The channel steel is arranged obliquely. The top end supports the outer platform of the pier, and the bottom end is connected to one end of the rebar. The rebar passes through the pier and is fixed to the vertical stiff frame in the pier. 3. The method for installing the formwork for the solid section of the top of the pier with super-high curved hollow column and slab pier according to claim 1 or 2, characterized in that: in the step (2), the corbel support system includes pre-embedded I-beams For corbels, the pre-embedded I-steel is fixed to the vertical rigid frame in the pier before the concrete steel formwork inside the bridge pier is assembled, and then the corbel is connected to the pre-embedded I-steel through the anchor plate, and the lower side of the corbel is anchored The plate is connected with the vertical stiff frame by screw steel. 4. The installation method of the solid section formwork of the curved super-high hollow column slab pier pier top according to claim 3, characterized in that: in the step (2), the vertical strength of the pre-embedded I-beam and one side thereof The permanent skeleton is connected by welds, and the embedded I-beam and the anchor plate on the other side are fixed by welds, and the welds are double fillet welds. 5. The installation method of the solid section formwork of the curved super-high hollow column slab pier pier top according to claim 4, characterized in that: in the step (3), the steel frame support structure includes a longitudinal section above the corbel. I-beams, steel beams located on the longitudinal I-beams and longitudinal distribution steel beams on the steel beams, the steel trusses are hoisted above the longitudinal distribution steel beams of the steel frame support structure, and connected to the longitudinal distribution beams by fasteners Assign steel beams connected. 6. The installation method of the solid section formwork of the super-high curved hollow column slab pier pier top according to claim 5, characterized in that: in the step (3), the size of the cover plate is larger than the upper size of the steel truss, In addition, pre-embedded bolts and I-beam embedded parts are arranged on both sides of the cover plate. When the formwork concrete of the solid section of the pier top is to be poured, the cover plate and the solid section are connected as a whole, and the embedded bolts are used to connect it to the steel truss.

Images