CN207277211U - Large steel pipe truss for bent cap cast-in-place construction - Google Patents

Abstract

The utility model relates to a large steel pipe truss used for cast-in-place construction of cover beams. Two trusses are located on both sides of pier columns and fixed with the pier columns. Composition, the vertical rod is composed of upper vertical rod and lower vertical rod, the lower vertical rod is a double steel pipe placed on the bearing platform, the upper end of the double steel pipe is fixedly connected to the upper vertical rod through the lower chord, and the top of the upper vertical rod is fixedly connected with the upper chord , a large oblique rod is connected between the upper chord and the lower chord, and a web rod is connected between the upper chord and the large oblique rod. The utility model can solve the technical problem that the cover beam is located on the side of the river, one side faces the water, and there is a height difference between the road and the bearing platform, and the K33 cover beam is located in the center of the river channel, and the floor-standing full hall support cannot be erected, and the bearing platform is fully used as a support On the surface, self-made large steel pipe trusses and construction methods are adopted. In addition, the truss can also be used for standard cover beams on general road sections, and the space on both sides of the truss can meet the traffic demand.

Description

Large steel pipe trusses for cast-in-place construction of cap beams

technical field

The utility model relates to a building cover beam, in particular to a large steel pipe truss used for the cover beam, and belongs to the technical field of large steel pipe trusses.

Background technique

A certain project is located on the current East Outer Ring Road, the foundation is in good condition, and the cover beams are cast-in-place by bracket method. After comprehensive consideration of traffic, rivers, green belts and other influencing factors, the design of the cover beam support of the project will be a large steel pipe truss.

Among them, No. K23, K24, K32, and K34 cover beams are located on the side of the river, facing the water on one side, and there is a height difference between the road and the platform. The bearing platform is used as the supporting surface, and the self-made large steel pipe truss method is used for construction. Of course, this truss can also be used for standard cover beams on general road sections, and the space on both sides of the truss can meet the traffic demand.

Contents of the invention

The utility model aims to solve the technical problem that the floor-to-ceiling full hall support cannot be erected when the cover beam is located in the center of the river, and provides a large steel pipe truss for the cast-in-place construction of the cover beam.

The technical solution of the utility model is: a large steel pipe truss used for the cast-in-place construction of the cover beam, which has two trusses placed on the bearing platform, with the bearing platform as the supporting surface, and the two trusses are located on both sides of the pier column. And it is fixed with the pier columns. The truss is composed of vertical rods, upper chords, lower chords, large oblique rods and web rods. The vertical rods are composed of upper vertical rods and lower vertical rods. The lower vertical rods are double The upper end of the double steel pipe is fixedly connected to the upper pole through the lower chord. The top of the upper pole is fixedly connected to the upper chord. pole.

There are several longitudinal bridge distribution beams on the top chord, the distance between the longitudinal bridge distribution beams is 300mm ~ 600mm, and there is a space ≥ 1.2m between the longitudinal bridge distribution beams and the bottom of the cover beam to set up the full hall support adjustment layer.

The height of the truss is 4m. The upper chord is a bearing beam, which is made of Shuangpin 56a I-beam, the lower chord is made of Shuangpin HW300×300 steel, and the web is made of Ф400mm×7mm and Ф277mm×6.5mm steel pipes. The lower pole is made of double Ф400mm×7mm steel pipes. The bridge distribution beam adopts 16# I-beam.

In order to facilitate transportation, a splicing point is set at the minimum bending moment position of the upper and lower chords, and 1/4 of the two fulcrums, and is connected by high-strength bolts.

The beneficial effects of the utility model are:

The utility model can solve the technical problem that the cover beam is located on the side of the river, one side faces the water, and there is a height difference between the road and the bearing platform, and the K33 cover beam is located in the center of the river channel, and the floor-standing full hall support cannot be erected, and the bearing platform is fully used as a support On the surface, self-made large steel pipe trusses and construction methods are adopted. In addition, the truss can also be used for standard cover beams on general road sections, and the space on both sides of the truss can meet the traffic demand.

Description of drawings

Fig. 1 is the structural schematic diagram of the large steel pipe truss structure that is used for the cast-in-place construction of the cover beam of the present utility model;

Figure 2 is a schematic diagram of the truss installation.

Detailed ways

As shown in Figure 1, it is a large steel pipe truss used for the cast-in-place construction of the cover beam. The large steel pipe truss directly uses the bearing platform as the supporting surface. The large steel pipe truss is finalized and processed, and assembled on site. The large steel pipe truss is made of Q235 steel. The two trusses are located on both sides of the pier columns and are fixed to the pier columns. The trusses are composed of uprights, upper chords 3, lower chords 4, large diagonals 5, and webs 6. The uprights consist of upper 2 and lower chords. 1, the lower vertical rod 1 is a double-strand steel pipe placed on the bearing platform, the upper end of the double-strand steel pipe is fixedly connected to the upper vertical rod 2 through the lower chord 4, the top of the upper vertical rod 2 is fixedly connected to the upper chord 3, and the upper chord 3 and the lower chord A large oblique rod 5 is connected between the rods 4 , and a web rod 6 is connected between the top chord 3 and the large oblique rod 5 .

The single lower pole 1 is made of double Ф400mm×7mm steel pipes. The height of the large steel pipe truss is 4m. The upper chord 3, that is, the bearing girder, is made of Shuangpin No. 56a I-beam, the lower chord 4 is made of Shuangpin HW300×300 steel, and the web 6 is made of Ф400mm×7mm and Ф277mm×6.5mm steel pipes. For the convenience of transportation, the upper and lower chords 3 , 4 The minimum bending moment position, the splicing point is set at 1/4 of the two fulcrums, and high-strength bolts are used to connect.

The longitudinal bridge distribution beam above the truss adopts 16# I-beam with a spacing of 300mm and 600mm (cooperating with the upper pole of the bowl buckle steel pipe support). A space of no less than 1.2m shall be reserved between the distribution beam and the bottom of the cover beam to set up the adjustment layer of the full hall support and take it as a fall-off measure.

Large steel pipe truss processing and construction methods:

1. The section steel used in the truss is strictly in accordance with the design requirements, not less than the calculated specifications, and must not have serious corrosion, holes, bending deformation and other defects.

2. The truss assembly error should meet the construction accuracy requirements, the bolts should be aligned and tightened, and the truss elevation should be controlled accurately. Where the elevation is inconsistent due to processing and installation errors, it needs to be leveled with a backing plate.

3. After the monolithic truss is assembled into a whole on the ground inside the bridge span, two 25t cranes are used for lifting installation as shown in Figure 2 (the monolithic truss weighs about 9.1t). After the single-piece truss is erected, it should be temporarily consolidated and bound to the pier column immediately. After the other piece of truss is erected, it should be consolidated and stabilized in time.

4. For the No. K33 pier cover beam in the middle of the river, the steel pipe of the lower column should be installed and fixed in place after the construction of the pier column is completed and before the cofferdam is removed. After the main structure of the auxiliary road bridge is formed, the crane stands on the auxiliary road bridge Lift the truss on the surface.

5. The stabilization system uses hoops to connect the trusses to the pier columns, and scissor braces and connecting rods are also provided.

6. The height adjustment device is spliced and adjusted with modular vertical rods, and the parts that are not adjusted enough are poured with concrete pads on the bearing platform.

7. The load of the cover beam is transmitted to the truss, vertical pole and cap through the distribution beam (No. 16 I-beam) on the truss. Each node is partially reinforced with a stiffened steel plate, and the connection between the vertical pole and the cap is sealed with a 15mm steel pipe. , to increase the stress area.

8. The operation platform is designed on the longitudinal 16# I-beam at the bottom of the cover beam, the working width of each side is 0.8m, and vertical poles are set every 1.8m. Two horizontal railings are installed on the vertical poles, and the height of the horizontal railings is 1.2 m, and set skirting boards and safety nets as required. Install the vertical 16# I-beam of the horizontal pole and the truss with 16# iron wire to bind firmly.

Claims (5)

1. A large steel pipe truss used for the cast-in-place construction of the cover beam, which is placed on the bearing platform, with the bearing platform as the supporting surface, has two trusses, and the two trusses are located on both sides of the pier column and fixed to the pier column, It is characterized in that: the truss is composed of vertical rods, upper chords (3), lower chords (4), large oblique rods (5), and webs (6), and the vertical rods are composed of upper vertical rods (2) and lower The vertical rod (1) is composed of the lower vertical rod (1) which is a double steel pipe placed on the bearing platform, the upper end of the double steel pipe is fixedly connected to the upper vertical rod (2) through the lower chord (4), and the top of the upper vertical rod (2) An upper chord (3) is fixedly connected, a large oblique rod (5) is connected between the upper chord (3) and the lower chord (4), and a web (5) is connected between the upper chord (3) and the large oblique rod (5). 6). 2. The large steel pipe truss used for the cast-in-place construction of the cover beam according to claim 1, characterized in that: the upper chord (3) is provided with several longitudinal bridge distribution beams, and the distribution beams between the longitudinal bridge direction distribution beams The spacing is 300mm ~ 600mm, and there is a space ≥ 1.2m between the distribution beam of the longitudinal bridge and the beam bottom of the cover beam to set up the adjustment layer of the full hall support. 3. The large steel pipe truss used for the cast-in-place construction of the cover beam according to claim 1, characterized in that: the height of the truss is 4m. 4. The large steel pipe truss used for the cast-in-place construction of the cover beam according to claim 1, characterized in that: the upper chord (3) is a load-bearing girder, and the I-beam No. 56a of Shuangpin is used, and the lower chord (4) Shuangpin HW300×300 section steel is used, and the web bar (6) is made of Ф400mm×7mm and Ф277mm×6.5mm steel pipes; the longitudinal bridge direction distribution beam is made of 16# I-beam; the lower pole is made of double Ф400mm×7mm steel pipes. 5. The large steel pipe truss used for the cast-in-place construction of the cover beam according to claim 1, characterized in that: in order to facilitate transportation, a splicing point is set at the minimum bending moment position of the upper and lower chords, and at 1/4 of the two fulcrums, using High-strength bolt connection.