CN115404783A - Sliding construction method for super-wide separated steel box girder of super-large cable-stayed bridge - Google Patents

Abstract

The invention discloses a sliding construction method of an ultra-wide separating type steel box girder of an extra-large cable-stayed bridge, which is characterized in that the ultra-wide separating type steel box girder is hoisted to a placing pier of a supporting structure on the side of a river by a floating crane, an upper beam body and a lower beam body slide through a main tower by a sliding device and then are hoisted by the floating crane, the beams are connected with the upper beam body and the lower beam body by matching pieces and code plates, a left box body, a right box body and the beams synchronously slide to design positions, the line shape is adjusted to meet the monitoring and design requirements, and the realization of the sliding construction comprises the following steps: the device comprises a supporting structure, a steel longitudinal beam, a sliding device, a placing pier and a tensioning structure; the steel longitudinal beam and the placing pier are arranged on the supporting structure and are rigidly connected with the supporting structure; the sliding device consists of a steel rail, a sliding shoe, a jacking oil cylinder, a lateral oil cylinder, a distribution beam, a pushing oil cylinder and a rail clamping device. Compared with the prior art, the ultra-wide separation type steel box girder has the advantages of simple structure, high efficiency, accuracy, safety, synchronous sliding erection, high working efficiency, low labor intensity and safe construction.

Description

A sliding construction method for super-wide separated steel box girders of extra-large cable-stayed bridges

technical field

The invention relates to the technical field of steel structure bridge construction, in particular to a sliding construction method for super-wide separated steel box girders of extra-large cable-stayed bridges.

Background technique

The extra-large double-tower cable-stayed bridge consists of a side span and a main span. The steel box girder of the side span is located on the shore and has a long distance. Due to the large section and heavy weight of the steel box girder, it is generally transported by water. When the water level is shallow, the floating crane cannot be hoisted. The prefabricated steel box girder parts are used. The bridge position needs to be erected with a large amount of brackets. Therefore, it is generally not suitable to use a large number of loose parts to install the construction method. In order to ensure the manufacturing quality of the steel box girder and complete the erection of the steel box girder, the construction of the sliding method is a new solution.

In the construction of the sliding method in the prior art, a hoist is installed at one end as the traction device, and the steel girder is pulled to slide, so that the steel girder is pulled forward. This method needs to set a reaction force point, and the lower support of the steel box girder has the influence of reaction force, which affects the lower support. The force is unfavorable, and only longitudinal forward movement can be realized, and the line shape and position adjustment of the beam body cannot be quickly realized. The stability and synchronization of the sliding process are poor, the accuracy of the sliding distance is low, and it is difficult for the beam section to pass through the main tower.

Contents of the invention

The object of the present invention is to provide a sliding construction method for super-wide separated steel box girders of super-large cable-stayed bridges in view of the deficiencies in the prior art, and adopt a hydraulic self-locking mechanism sliding device to realize the position of the steel box girder. , Linear fast adjustment, the sliding device is clamped by the hydraulic self-locking mechanism and the sliding track, so that the pushing reaction force of the steel box girder forward is the internal force, and the horizontal reaction force of the steel box girder support structure is small, which greatly reduces the horizontal force on the support The impact of the steel box girder can be adjusted horizontally, vertically and vertically. The integrated device of pushing and falling beams has a simple structure and is easy to use. The amount of brackets erected at the bridge position is small, which shortens the on-site installation period. The impact is small, the welding quality of steel box girders is further guaranteed, and the super-wide separated steel box girders of extra-large cable-stayed bridges are ensured to be erected efficiently and with high quality, which has a good application prospect.

The specific technical solution for realizing the purpose of the present invention is: a sliding construction method of an ultra-wide separated steel box girder of a super-large cable-stayed bridge, which is characterized in that the ultra-wide separated steel box girder is hoisted by a floating crane to the shelving of the supporting structure on the river side On the pier, use the sliding device to slide the upstream and downstream beams through the main tower, and then use the floating crane to lift the beams. The beams and the upstream and downstream beams are connected by matching parts and code plates, and the left and right boxes and beams slide to the design position synchronously. Adjust the line shape to meet the monitoring and design requirements.

The sliding device of the steel box girder sliding construction is arranged symmetrically with the center line of the cable-stayed bridge, and the facilities for realizing the steel box girder sliding construction include: supporting structure, steel longitudinal beam, sliding device, shelving pier, and tension structure; The steel longitudinal beams and shelving piers are set on the supporting structure and rigidly connected with the supporting structure; the sliding device is composed of steel rails, sliding shoes, jacking cylinders, lateral cylinders, distribution beams, jacking cylinders, and rail clamps The steel rail is placed on the steel longitudinal beam and clamped with a clamp, and the rails under the same sliding shoe are arranged in parallel according to the structure of the sliding shoe; the sliding shoe is placed on the rail, and the rail is coated with lubricating oil to reduce the friction coefficient; the jacking The oil cylinder is placed on the sliding shoe, and the upper part of the jacking oil cylinder is provided with a distribution beam; the lateral oil cylinder is bolted to the lateral support of the sliding shoe; four sliding shoes are arranged at the lower part of the steel box beam; between the distribution beams, steel The box girder and the distribution beam are connected by a tension structure to better realize the synchronous sliding of the steel box girder; the tension structure is tensioned and fastened by threaded steel; the shelving pier is placed on the sliding device The two sides are welded and connected with the supporting structure, and are used for the falling beam of the steel box girder to realize the removal of the sliding shoe device, so that the subsequent beam body can slide cyclically.

The pushing oil cylinder, jacking oil cylinder and side oil cylinder of the sliding device adopt hydraulic synchronous control technology to realize the forward movement, linear adjustment and drop of the steel box girder.

The slip line shape of the steel box girder is determined by the oblique straight line determined by the girder bottom elevation h1 of the slip start point and the girder bottom elevation h2 of the slip end point.

The shelving pier is symmetrically arranged and supported at the rigid position of the steel box girder diaphragm, and the elevation of the shelving pier is determined by slip linear interpolation.

The elevation of the jacking oil cylinder should be less than the elevation of the shelving pier when the cylinder is fully retracted, so as to realize the falling of the beam body.

The clear distance between the lateral oil cylinder and the resting pier is not less than 50 mm to avoid interference with the resting pier when the sliding shoe is offset.

The tension structure realizes that there is no displacement between the sliding device and the beam body, so that the beam body slides synchronously in the longitudinal direction.

Compared with the prior art, the present invention has ultra-wide separated steel box girder with efficient, accurate, safe and synchronous sliding erection, simple structure, convenient use, less support for bridge erection, shortening the on-site installation period, and realizing cable-staying The bridge side-span separated steel box girder is hoisted on the river side and slides synchronously to the shore side, which can precisely adjust the lateral position of the beam section, so that the beam is accurately connected with the boxes on both sides, and solves the problem that the beam section passes through the main tower. The steel box girders and beams on both sides are hoisted by cranes. No large-scale lifting equipment is required on the shore side, which can quickly adjust the position and line shape of the beam section, shortening the service life of large-scale lifting equipment, and the line shape adjustment efficiency of the beam section is high. After the section slides to the design position, it falls on the shelving pier, which improves the utilization rate of the sliding device, has low labor intensity, is economical, efficient, and safe, and has a good application prospect.

Description of drawings

Fig. 1 is the overall structural plan layout drawing of embodiment;

Fig. 2 is a schematic diagram of a steel box girder supported by a sliding device;

Figure 3 is a schematic diagram of the slip line;

Fig. 4 is a schematic diagram of a jacking cylinder, a supporting structure and a tensioning structure;

Fig. 5 is a schematic diagram of the structure of the sliding device.

Detailed ways

The present invention will be further described in detail through specific implementation below.

Example 1

Referring to Figures 1 to 3, support structures 1 are set up on both sides of the bridge centerline, and the ultra-wide separated steel box girder (beam section) 6 prefabricated in large sections in the factory is transported to the bridge site and hoisted to the river by floating crane. On the shelving pier 4 of the side support structure 1, use the sliding device 3 to slide the upstream and downstream beams through the main tower, and use the floating crane to lift the beam 7, and the beam 7 and the upstream and downstream beams are connected to the beams through matching parts and code plates The left and right boxes of section 6 and the beam 7 slide synchronously to the design position, and the sliding construction of the steel box girder 6 is symmetrically arranged on the center line of the cable-stayed bridge. The single-sided steel box girder 6 is hoisted to the shelving pier 4 of the supporting structure 1 on the river side by a floating crane, and the beam 7 is hoisted after sliding past the main tower. Putting it on the pier specifically includes the following steps:

S1. Super-wide steel box girders are prefabricated in sections in the factory.

S1. Construction support structure 1, carry out 1.1 times load preload on support structure 1.

S2. The steel rail 31 is installed after measuring the position, alignment and elevation of the construction steel longitudinal beam 2 to meet the requirements.

S3, making the sliding shoe 32, installing the jacking oil cylinder 33, the lateral oil cylinder 34, the jacking oil cylinder 36, and the rail clamp 37.

S4. According to the slip line shape determined by the elevation h1 of the beam bottom at the start point of the slippage and the elevation h2 of the beam bottom at the end point of the slippage, see Figure 3 for details, the elevation of the shelving pier 4 is determined by interpolation, and the shelving pier 4 is arranged on the beam section 6 The center of gravity of the enveloping beam segment below the diaphragm.

S5. Stake out to determine the position of the sliding device 3 so that it is supported at the transverse diaphragm of the steel box girder 6 .

S6. Install the oil connection pipe, control wires, cables, sensors, etc. for the sliding device. After passing the inspection, debug the pump station and control system, and carry out no-load debugging.

S7. During the official sliding process, monitor the 6-axis of the steel box girder, the position of the sliding shoe 32 and the rail 31, the clamping of the rail clamp 37, the load and synchronization of each point, and the deformation of the support structure.

S8. After the sliding is in place, the steel box girder 6 falls on the shelving pier 4, and the lateral position, longitudinal position, and elevation are precisely positioned by using the sliding device to complete the welding of the girth weld.

S9. Utilize the hoist to pull to the hoisting area of the steel box girder on the river side, and prepare for the sliding work of the lower girder section.

Referring to Figures 4 to 5, the facilities for realizing the sliding construction of steel box girders include: supporting structure 1, steel longitudinal beam 2, sliding device 3, shelving pier 4, tension structure 5; said steel longitudinal beam 2, shelving pier 4 Placed on the support structure 1 and rigidly connected with the support structure 1; the sliding device 3 is composed of a steel rail 31, a sliding shoe 32, a jacking cylinder 33, a lateral cylinder 34, a distribution beam 35, a jacking cylinder 36, and a clamping rail device 37. The rails 31 are placed on the steel longitudinal beams 2 and pressed by clamps, and the rails 31 under the same sliding shoe 32 are arranged in parallel according to the structure of the sliding shoes 32; the sliding shoes 32 are placed on the rails 31, and the rails 31 are coated with lubricating oil Reduce the friction coefficient; the jacking cylinder 33 is placed on the sliding shoe 32, and the upper part of the jacking cylinder 33 is provided with a distribution beam 35; the lateral oil cylinder 34 is bolted and fixed by the bracket and the sliding shoe 32; the lower part of the steel box girder 6 Four sliding shoes 32 are set; between the distribution beams 35, between the steel box girder 6 and the distribution beam 35 are connected through the tension structure 5, so as to better realize the synchronous sliding of the steel box girder 6; The tension structure 5 is tensioned and fastened by threaded steel 51; the shelving pier 4 is placed on both sides of the sliding device 3 and welded to the support structure 1, and is used for the falling beam of the steel box girder 6 to realize the sliding device 3 The removal of the beam allows the subsequent beam to slip cyclically.

The above is only a further description of the present invention, and is not intended to limit this patent. All equivalent implementations of the present invention should be included in the scope of claims of this patent.

Claims (5)

1. The utility model provides a super wide disconnect-type steel box girder's of super large cable-stay bridge construction method that slides, its characterized in that steel box girder's the construction that slides adopts big section prefabricated super wide disconnect-type steel box girder in the mill to transport to the bridge position, hoist to river side bearing structure through the floating crane on shelving the mound, adopt the displacement device will go up, the low reaches roof beam body slides and crosses the king tower, utilize the floating crane hoist and mount crossbeam, the crossbeam with go up, the low reaches roof beam body passes through matching piece, the left and right box of steel box girder is connected to the sign indicating number board, and the crossbeam slides to the design position in step, it is linear to the designing requirement to adjust, the concrete construction of sliding of steel box girder includes following step:

s1, prefabricating ultra-wide steel box girder sections in a factory;

s1, constructing a support structure, and performing 1.1-time load pre-pressing on the support structure;

s2, constructing a steel longitudinal beam, and installing a steel rail after the measured position, line shape and elevation meet the design requirements;

s3, the installation comprises: the sliding device consists of a sliding shoe, a jacking oil cylinder, a lateral oil cylinder, a pushing oil cylinder and a rail clamping device;

s4, determining the elevation of the resting pier by adopting an interpolation method according to the slippage line shape determined by the beam bottom elevation h1 of the slippage starting point and the beam bottom elevation h2 of the slippage finishing point;

s5, lofting to determine the position of the laying pier, and enabling the laying pier to be supported on the diaphragm plate of the beam section;

s6, installing an oil receiving pipe, a control wire and a sensor on the oil cylinder, and debugging a pump station and a control system;

s7, starting the sliding of the steel box girder after the no-load debugging is qualified, and monitoring the axial line of the steel box girder, the clamping condition of the sliding shoes and the steel rail, the clamping condition of a rail clamping device, the load and synchronism of each point and the deformation condition of a supporting structure in the sliding process;

s8, after the beam section slides in place, the beam section is placed on a placing pier, and transverse position, longitudinal position and elevation fine positioning is carried out by using a sliding device to complete welding of a circumferential weld;

and S9, dragging the steel box girder to a river side steel box girder hoisting area by using a winch to prepare for sliding operation of the next section of girder.

2. The slippage construction method for the ultra-wide separated steel box girder of the extra-large cable-stayed bridge according to claim 1, wherein the slippage device comprises: the steel rail is arranged on a steel longitudinal beam of the supporting structure and is clamped and pressed by a clamping plate; the sliding shoes are arranged on the steel rails to support the steel box girders on the upper parts of the steel rails, and the steel rails under the same sliding shoes are arranged in parallel according to the sliding shoe structure; the jacking oil cylinder is arranged on the sliding shoe; the distribution beam is arranged on the jacking oil cylinder; the lateral oil cylinder is arranged on the sliding shoe and is fixedly connected with the sliding shoe through a bracket and a sliding shoe bolt; four sliding shoes are arranged at the lower part of the steel box girder; the distribution beam is connected with the steel box beam through the tensioning structure, so that the sliding device and the beam body do not have displacement, and the beam body longitudinally slides synchronously; and the tensioning structure is tensioned and fastened through deformed steel bars.

3. The slipping construction method of the ultra-wide separating steel box girder of the extra-large cable-stayed bridge according to claim 1 or claim 2, characterized in that the laying piers are arranged at two sides of the slipping device and are symmetrically supported below a diaphragm plate of the steel box girder for the falling of the steel box girder and the moving out of the slipping device, the elevation of the laying piers is determined by the linear interpolation of slipping, and the laying piers and the supporting structure are welded.

4. The slippage construction method for the ultra-wide separate type steel box girder of the extra-large cable-stayed bridge according to claim 1 or claim 2, wherein the slippage line shape of the steel box girder is determined by an inclined straight line determined by a beam bottom elevation h1 of a slippage starting point and a beam bottom elevation h2 of a slippage ending point.

5. The ultra-wide separation type steel box girder sliding construction method for the extra-large cable-stayed bridge according to claim 1 or claim 2, wherein the jacking oil cylinder, the lateral oil cylinder and the jacking oil cylinder are hydraulically and synchronously controlled to realize forward movement, linear adjustment and girder falling of the steel box girder; the elevation of the jacking oil cylinder when the cylinder is completely contracted is smaller than the elevation of the laying pier so as to realize the beam falling of the beam body; the clear distance between the lateral oil cylinder and the placing pier is not less than 50mm, and interference between the lateral oil cylinder and the placing pier is avoided when the sliding shoe deviates.

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