CN103243658B - The spelling method of cable stayed bridge dragging suspension basket - Google Patents

Abstract

The invention discloses a cable-stayed bridge hanging basket. The hanging basket includes a front half and a rear half which can be spliced together with a frame structure in the shape of a "Japanese" character. The front half includes a pair of The main longitudinal beam and the front cross beam and the middle cross beam arranged between the main longitudinal beams; the rear half part includes a pair of parallel rear longitudinal beams connected in line with the main longitudinal beams and arranged near the rear longitudinal beams The rear cross member at the rear end. The assembling method of the dragline hanging basket first installs a bracket by using the lower beam of the cable tower, and completes the construction of the 0-1# main beam on the bracket, and then uses the temporary cable reserved for the tower column to complete the hanging basket assembly platform For installation, assemble the first half of the hanging basket and complete the pouring of blocks 0-2#; secondly, drop the first half of the hanging basket and move it forward on the platform to assemble the second half of the hanging basket; finally assemble the assembled The hanging basket is lifted as a whole, and is anchored and connected with the 0-2# main girder of the cable-stayed bridge. The invention has the advantages of simple and convenient construction, reduced cost and low safety risk.

Description

Assembling Method of Cable-Stayed Bridge Hanging Basket

technical field

The invention relates to a road and bridge construction technology, in particular to a method for assembling cable-stayed bridge suspension baskets.

Background technique

A cable-stayed bridge is a bridge whose deck system is under compression and its support system is under tension. The deck system is composed of stiffened beams, and its support system is composed of steel cables. Since the Stromsun Bridge in Sweden opened the prelude to the construction of modern cable-stayed bridges in 1956, with the development of material science and computer science, a large number of cable-stayed bridges have been built at home and abroad, and their spans are gradually increasing. Cable-stayed bridges develop rapidly due to their large spanning capacity, good structural performance, simple construction, easy maintenance, low cost and light and beautiful appearance. The main feature of the cable-stayed bridge is to use the oblique cables drawn from the bridge tower as the elastic intermediate support of the beam collapse, so as to reduce the section bending moment of the beam collapse, reduce the beam weight, and improve the spanning capacity of the beam.

A cable-stayed bridge is a composite structure composed of cables, towers, and beams as the basic structure. Among them, beams and towers are the main load-bearing components, and the two are combined to form an overall structure. According to the support mode of the beam, including the connection mode between the beam and the tower or pier, different forms of parent structures are formed, but the beam is suspended on the tower in the form of elastic support by means of oblique cables. This intermediate elastic support (diagonal Cables) enhance the stiffness of the beam, forming multi-point elastically supported variable cross-section continuous beams, single cantilever beams, T-shaped rigid frames and continuous rigid frames.

Generally speaking, there are three commonly used methods for the construction and erection of cable-stayed bridges: support method, jacking method and cantilever construction method. The first two methods were mostly used in the early construction of cable-stayed bridges. For the current long cable-stayed bridges, especially multi-span cable-stayed bridges, the cantilever construction from the bridge tower to the two sides is often used, and the cable-stayed bridges are constructed section by section. support. The cantilever construction method is generally to pour the No. 0 beam section in the tower column area first, as the initial beam section for placing the lifting equipment, and then use various lifting equipment to install the beam sections symmetrically from both sides of the tower column in sequence, so that the cantilever can be extended until it is closed , this method requires the use of an important piece of equipment - the lanyard basket.

The assembling of the hanging baskets is a very important process in the cantilever pouring process of the cable-stayed bridge. The traditional way of assembling the hanging baskets is: first assemble the hanging baskets on the open space, and then use the hoist to lift The system carries out the lifting of the hanging basket, and finally anchors the hanging basket to the main beam, and finally completes the assembly of the hanging basket.

Under normal circumstances, when the bridge deck is relatively low from the ground, temporary supports are erected for No. 0 and No. 1 cast-in-place sections. , the floor-to-ceiling steel pipe brackets are used to assemble the hanging basket, and the cast-in-place section construction and the hanging basket cantilever construction are carried out. With the development of my country's economy, a number of deep-water foundations and large-span bridges in mountain canyons will be built on a large scale, and cable-stayed bridges will become the preferred bridge type because of their large-span capabilities. However, the construction site of cable-stayed bridges in mountainous areas is narrow, and the height of the bridge deck from the ground is high, which can reach more than 100m. The amount of support materials required is too large, and the cost is high. Long; and the overall lifting height of the hanging basket is high, which poses a great safety risk. For this reason, a new hanging basket assembly method is needed to reduce the safety risk, construction cost and construction period of the hanging basket assembly of cable-stayed bridges in mountainous areas.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a construction project with low safety risk, shortened construction period and low construction cost, which is suitable for construction in places with poor construction conditions, steep terrain, narrow sites and difficult transportation of large equipment and components. A method for assembling cable-stayed bridge suspension baskets.

For achieving above technical purpose, the technical scheme that the present invention adopts is as follows:

A cable-stayed bridge hanging basket, wherein, the hanging basket includes a front half and a rear half of a frame structure in the shape of a "day" that can be spliced together, and the front half includes a pair of main shafts arranged in parallel. The longitudinal beam and the front beam and the middle beam arranged between the main beam, the front beam is arranged near the front end of the main beam, and the middle beam is arranged near the middle and rear end of the main beam; A pair of parallel tail longitudinal beams connected by the main longitudinal beams collinearly and a rear cross member arranged near the rear end of the tail longitudinal beams.

The assembling method of above-mentioned cable-stayed bridge stay cable hanging basket, it comprises the following steps:

(1) Install Bailey truss brackets on both sides of the lower beam of the built cable tower;

(2) use the Bailey truss type bracket as the work platform, pour the 0-1# main girder of the cable-stayed bridge, so far complete the installation of the assembling platform of the dragline hanging basket;

(3) Carry out the assembly of the first half of the dragline hanging basket on the assembly platform;

(4) take the first half of the guy rope hanging basket that has been put together as the work platform, and pour the 0-2# main girder of the cable-stayed bridge;

(5) push forward the first half of the hanging basket along the extension direction of the main girder of the cable-stayed bridge, until leaving the space for assembling the second half of the hanging basket;

(6) Assembling the second half of the hanging basket on the assembly platform;

(7) Lift the assembled hanging basket as a whole, and anchor it with the 0-2# main beam of the cable-stayed bridge, so far the installation of the dragline hanging basket is completed.

Specifically, the cable tower also includes corbels arranged on both sides of its lower beam and temporary cables arranged on its tower column. One end of the Bailey truss bracket is fixedly connected to the corbel, and the other end Anchored connection with the temporary cable.

Furthermore, the whole hanging basket is anchored and connected to the 0-2# main beam of the cable-stayed bridge by respectively setting the middle anchor rod, the middle hanger rod and the rear hanger rod on the main longitudinal beam, the middle cross beam and the tail longitudinal beam respectively. .

Compared with the prior art, the present invention has the following advantages:

a, the assembling method of cable-stayed bridge cable hanging basket provided by the present invention uses the Bailey truss type bracket erected on the cable tower as the assembling platform of hanging basket, which overcomes the narrow and small construction site in mountainous areas and the high bridge deck height The inferior conditions make it easier to carry out the project;

b. The assembling method of the cable-stayed bridge cable hanging basket provided by the present invention, the Bailey truss type bracket is a simply supported structure as a whole, and the bracket of the main stress structure has clear stress characteristics, simple construction, large bearing capacity, and strong structure. Safety; the bracket can also be in a suitable stress state by adjusting the cable force of the temporary cable;

c. The method for assembling the cable-stayed hanging basket of the cable-stayed bridge provided by the present invention divides the installation of the assembling platform and the assembly of the hanging basket into two parts, which reduces the risk of lifting and installing construction materials.

Description of drawings

Fig. 1 is the structural representation of the assembly platform in the assembling method of cable-stayed bridge suspension basket of cable-stayed bridge of the present invention, wherein Bailey truss type bracket has been installed, and 0-1# main girder has been poured and completed.

Fig. 2 is a schematic diagram of the first half of the hanging basket in the assembling method of the hanging basket of the cable-stayed bridge of the present invention after the assembling is completed on the assembling platform.

Fig. 3 is a schematic diagram of the position of each part of the bridge before the second half of the hanging basket is assembled in the assembling method of the hanging basket of the cable-stayed bridge of the present invention, wherein the main girder of 0-2# has been poured, and the first half of the hanging basket has been moved forward. push.

Fig. 4 is a schematic diagram of the overall lifting of the hanging basket in the assembling method of the cable-stayed hanging basket of the cable-stayed bridge of the present invention, mainly showing the side view structural diagram of the second half of the hanging basket and the tools for lifting.

Fig. 5 is a top view of the structure of the cable-stayed basket in the assembling method of the cable-stayed basket of the present invention.

Fig. 6 is a schematic diagram of the anchorage structure of the whole hanging basket and the bridge girder in the assembling method of the cable-stayed hanging basket of the cable-stayed bridge according to the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the assembling method of cable-stayed bridge suspension basket of the present invention is further detailed as follows:

With reference to Fig. 1-6, at first, install Bailey truss bracket 2 on both sides of the lower beam 11 of cable tower 1 that has been built; The 0-1# main girder 31 of the cable-stayed bridge, as shown in Figure 1, has completed the installation of the assembling platform (not marked) of the cable hanging basket so far.

The cable tower 1 also includes corbels 5 pre-buried on both sides of its lower beam 11 and temporary cables 4 arranged on its tower column. The bracket 2 makes full use of the structural characteristics of the cable-stayed bridge, and its rear end is fixed on both sides of the lower beam 11 of the cable tower 1 by using the corbel 5 and finished-rolled rebar (not shown). To withstand the vertical shear force generated by the bracket 2 due to its own weight, the finish-rolled rebar mainly bears the tension brought by the bracket 2 to the corbel 5; one end of the temporary cable 4 is fixed on the tower column, and the other end Then it is fixed on the front end of the bracket 2, so as to temporarily suspend and position the bracket 2.

Then, carry out the assembly of the front half 61 of the cable hanging basket on the platform according to the preset structure of the cable hanging basket 6 described later, as shown in Figure 2; The first half of the hanging basket 61 is a working platform, and the 0-2# main beam 32 of the pouring cable-stayed bridge is shown in Figure 3; Pull the main girder extension direction of the bridge and push forward until the space for assembling the second half of the hanging basket 62 is left, as shown in Figure 3; in the next step, carry out the assembly of the second half of the hanging basket 62 on the assembly platform, As shown in Figure 4.

As can be seen from the above several construction steps, in the present invention, the 0# main girder 3 of this cable-stayed bridge is poured in two sections in essence, and the bracket 2 that has been installed is used to pour the bridge near the cable tower 1 earlier. 0-1# main beam 31, utilize the hanging basket first half part 61 that described group puts together to build the 0-2# main beam 32 adjacent to 0-1# main beam 31, the pouring of these two sections of main beams all is to utilize existing Part of the installed work platforms are completed one after another, so as to avoid lifting too many construction materials at the construction site at one time, thereby reducing construction risks.

Please refer to Fig. 5, as can be seen from the top view of the lanyard hanging basket 6: the whole hanging basket 6 is a "day" frame structure, and the hanging basket 6 includes a front half 61 and a rear half 62 of the hanging basket that can be spliced together. The front half part 61 of the hanging basket includes a pair of main longitudinal beams 611 arranged in parallel, a front crossbeam 612 and a middle crossbeam 613 arranged in parallel between the main longitudinal beams 611, wherein the front crossbeam 612 is arranged near the main longitudinal beams The front end of the beam 611, the middle cross beam 613 is arranged near the middle rear end of the main longitudinal beam 611; the second half 62 of the hanging basket includes a pair of parallel tail longitudinal beams 622 connected in line with the main longitudinal beam 611 And the rear beam 622 arranged near the rear end of the tail longitudinal beam 621 .

Finally, the assembled hanging basket 6 is lifted as a whole, and anchored to the 0-2# main beam 32 of the cable-stayed bridge, as shown in Figures 4 and 6, and the installation of the dragline hanging basket is completed so far.

Please refer to Fig. 5 and Fig. 6, described hanging basket 6 also comprises the anchoring system that is used to promote itself and it is anchored on the main girder of cable-stayed bridge, and this anchoring system includes being arranged on the main longitudinal girder 611 on this main girder. The C-shaped beam 63 at the junction of the longitudinal beam 611 and the middle beam 613, the middle anchor rod 64 arranged on the main longitudinal beam 611 and adjacent to the C-shaped beam 63, the rear boom 65 arranged at the end of the tail longitudinal beam 622 and the The middle suspender (not shown) in the middle section of the middle crossbeam 613; on each longitudinal beam and crossbeam of the hanging basket 6, respectively offer the installation of the middle anchor 64, the middle suspender (not shown) and the rear suspender 65 The reserved holes 6111, 6131 and 6211.

In the actual construction process, the lifting of the hanging basket 6 is essentially the installation process of the anchoring system. Referring to Figure 4 and Figure 6, the hanging basket 6 is lifted by the middle anchor 64 and the jack 9, and the middle anchor 64 should be lifted before lifting. Tighten it slightly, and then stretch the temporary cables 4 of the bracket 2. When the temporary cables 4 are stretched, several temporary cables at symmetrical positions need to be stretched at the same time. The weight is slowly transferred to the 0# main beam 3, and finally the hanging basket 6 is lifted by the middle suspender and the rear suspender 65, and anchored. The c-shaped beam 63 is straddled on the 0# main beam 3, and is installed on the The thruster 66 on the tail longitudinal beam 621 and the anti-jack device 67 stabilize the hanging basket 6, so as to complete the hanging basket assembly.

In summary, the method for assembling cable-stayed hanging baskets of cable-stayed bridges according to the present invention is simple in construction, low in cost, and low in safety risks, and is suitable for implementation in sites with poor construction conditions, steep terrain, narrow sites, and difficult transportation of large equipment and components.

Therefore, the above-mentioned embodiment is a preferred embodiment of the present invention, but not only limited by the above-mentioned embodiment, any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principle of the present invention, All should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (3)

1. a kind of assembly method of cable-stayed bridge cable hanging basket is characterized in that, it comprises the following steps: (1) Install Bailey truss brackets on both sides of the lower beam of the built cable tower; (2) use the Bailey truss type bracket as the work platform, pour the 0-1# main girder of the cable-stayed bridge, so far complete the installation of the assembling platform of the dragline hanging basket; (3) Carry out the assembly of the first half of the dragline hanging basket on the assembly platform; (4) take the first half of the guy rope hanging basket that has been put together as the work platform, and pour the 0-2# main girder of the cable-stayed bridge; (5) push forward the first half of the hanging basket along the extension direction of the main girder of the cable-stayed bridge, until leaving the space for assembling the second half of the hanging basket; (6) Assembling the second half of the hanging basket on the assembly platform; (7) overall promotion of the hanging basket assembled together, and anchored connection with the 0-2# main girder of the cable-stayed bridge, so far the installation of the dragline hanging basket is completed; Wherein, the lanyard hanging basket includes a front half and a rear half of a frame structure in the form of a "Japanese" that can be spliced together, and the front half includes a pair of main longitudinal beams arranged in parallel and a Between the front crossbeam and the middle crossbeam, the front crossbeam is arranged near the front end of the main longitudinal beam, and the middle crossbeam is arranged near the middle and rear ends of the main longitudinal beam; The tail longitudinal beam arranged in parallel and the rear cross member arranged near the rear end of the tail longitudinal beam. 2. The assembling method of cable-stayed bridge suspension baskets as claimed in claim 1, characterized in that: said cable tower also includes corbels arranged on both sides of its lower crossbeam and temporary braces arranged on its pylons. One end of the Bailey truss bracket is fixedly connected to the corbel, and the other end is anchored to the temporary cable. 3. The assembling method of cable-stayed bridge hanging basket of cable-stayed bridge as claimed in claim 1, characterized in that: said hanging basket as a whole passes through middle anchor rods respectively arranged on its main longitudinal beam, middle beam and tail longitudinal beam. , The middle hanger and the rear hanger are anchored to the 0-2# main girder of the cable-stayed bridge.