CN115387242A - Method for erecting sliding support structure of extra-large steel bridge section - Google Patents

Abstract

The invention discloses a method for erecting a sliding support structure of an extra-large steel bridge section, which is characterized in that the sliding support structure combined with steel pipe piles and Bailey longitudinal beams is adopted, and the specific erection includes: construction of steel pipe piles, parallel connection of steel pipes Pile and braces, hoisting Bailey longitudinal beams, installing reinforcement support frames, lateral limit frames, corbel beams, track beams, and overload preloading. Compared with the prior art, the present invention has a large bearing capacity of the sliding support structure, which can meet the sliding construction of super large steel bridge sections, has a simple structure, high assembly efficiency, convenient production and installation, and less support for bridge erection, which greatly shortens the construction time. The on-site installation period is less affected by adverse environments such as strong winds and rain, and the welding quality of steel box girders has been further guaranteed, ensuring efficient and high-quality erection of ultra-wide and separated steel box girders for extra-large cable-stayed bridges, achieving economical rationality and high efficiency It is a safe target and has a good application prospect.

Description

A method of erecting a sliding support structure for an extra-large steel bridge section

technical field

The invention relates to the technical field of steel structure bridge construction, in particular to a method for erecting a sliding support structure of an extra-large steel bridge section.

Background technique

The division of extra-large steel bridge sections tends to be large sections. Prefabrication of large sections in the factory is carried out as much as possible. The loose assembly of on-site support method is not good for the assembly quality and accuracy of steel bridge sections, especially strong winds and heavy rains affect the welding quality of components. For this reason, the prefabricated overall installation of large sections is the main idea of the current steel bridge construction. For the long-distance large sections on the shore side, it is impossible to lift them to the design position by floating crane. shift. The sliding support system on land generally adopts the lattice type, and the sliding support system on the water can adopt the lattice type or frame type, which is determined comprehensively according to the section form, weight, and geological conditions of the riverbed of the steel bridge section.

The sliding support in the prior art adopts steel pipe pile foundation and welded main longitudinal beam support structure. The main longitudinal beam generally adopts welded box type or truss with large bearing capacity, but the cost is high, the construction period is long, and the demand for materials is large. In order to meet the construction needs of overweight, ultra-wide, and large separated beam sections that slide on one side and then slide as a whole, providing a support system with a short construction period, reusable materials, economical efficiency, safety and reasonableness is the key to the design of sliding support structures. The essential.

Contents of the invention

The object of the present invention is to provide a method for erecting a sliding support structure of a super large steel bridge section in view of the deficiencies in the prior art. , horizontal connection, and set on the crossbeam of the row of steel pipe piles, the supporting structure has a large bearing capacity, which can meet the sliding construction of the super large steel bridge section, the structure is simple, the assembly efficiency is high, the production and installation are convenient, and the bridge position The amount of brackets is small, which greatly shortens the on-site installation period, and is less affected by adverse environments such as strong winds and rains. The welding quality of steel box girders is further guaranteed, ensuring the efficient and high-quality erection of ultra-wide separated steel box girders for extra-large cable-stayed bridges , has achieved the goal of economical rationality, high efficiency and safety, and has a good application prospect.

The specific technical solution for realizing the object of the present invention is: a method for erecting a sliding support structure of an extra-large steel bridge section, which is characterized in that the sliding support structure adopting steel pipe piles and Bailey longitudinal beams is combined, and the specific erection includes the following steps:

S1. Rotary excavation is used to drill holes to construct steel pipe piles, and the steel pipe piles are staked out by a total station and real-time monitoring of steel pipe pile deviation, verticality and footage;

S2. The top elevation of the steel pipe pile is determined by sliding linear interpolation in combination with the height of the sliding equipment, steel rails, track beams, corbel beams, Bailey longitudinal beams and oil cylinder strokes, and is controlled as a negative deviation;

S3. After the steel pipe piles are sunk in place, perform parallel connection and diagonal bracing between the rows of steel pipe piles to increase the stability of the pipe piles;

S4, adjust the top elevation of the steel pipe pile, construct the crossbeam on the top of the pile, and the crossbeam and the steel pipe pile are welded;

S5. The truss unit of the Bailey longitudinal beam is hoisted in pieces, and the side is temporarily supported to prevent tipping, and the truss pin is installed to complete the longitudinal connection between the first truss unit and the second truss unit;

S6. Install the reinforcing support frame in parts, and use the support bolts to connect the Bailey longitudinal beam horizontally;

S7. Install the lateral limiters on both sides of the Bailey longitudinal beam and weld them to the beam. The longitudinal arrangement of the Bailey longitudinal beam should place the male and female heads of the truss unit on the upper part of the steel pipe pile and align with the central axis;

S8. Position and install the corbel and track beams in sequence, and carry out 1.1 times overload preload on the sliding support structure after erection;

S9. After the preloading is qualified, position and install the rails, control the straightness, rail spacing and misalignment of the rail joints, and meet the conditions for sliding equipment to fall off the rails.

The steel pipe piles are rock-socketed piles, and the embedding depth is determined according to design requirements.

The steel pipe piles are parallel connected through steel pipes or double channel steel, and the distance between the steel pipe piles is determined according to the working conditions, which is a multiple of 3m of the standard length of the Bailey truss unit and is not greater than 12m.

The Bailey longitudinal beam is composed of several standard 321 truss units connected horizontally and vertically, and the distance between the truss units is 200mm.

The reinforcing support frame is installed at the joint of the truss unit, and is bolted through the standard 321 Bailey frame support bolts. The diameter of the bolt holes is 24mm, and the hole spacing is 200mm.

The length of the truss pin is 1/2 of the width of the Bailey beam, and it is driven into the truss hole from the outside during connection.

The spacing between the corbels is 1.5m.

The elevation of the rail should be determined according to the slip linear interpolation, and the distance between the rail clamping plates of the rail is 0.5m.

Compared with the prior art, the present invention has a large bearing capacity of the sliding support structure, which can meet the sliding construction of super large steel bridge sections, has a simple structure, high assembly efficiency, convenient production and installation, and less support for the bridge position, which greatly shortens the construction time. The on-site installation period is less affected by adverse environments such as strong winds and rain, and the welding quality of steel box girders has been further guaranteed, ensuring the efficient and high-quality erection of super-wide separated steel box girders for extra-large cable-stayed bridges, achieving economical rationality and high efficiency It is a safe target and has a good application prospect.

Description of drawings

Fig. 1 is a schematic diagram of a supporting structure of the present invention;

Fig. 2 is A-A sectional view of Fig. 1;

节点结构示意图； Figure 3 is for Figure 1

Schematic diagram of the node structure;

Fig. 4 is a B-B sectional view of Fig. 3 .

Detailed ways

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

Example 1

Referring to Fig. 1～Fig. 2, the present invention adopts the sliding supporting structure that crossbeam and Bailey longitudinal beam combination are set on the steel pipe pile of parallel connection, specifically set up and comprise the following steps:

S1. The rock-socketed steel pipe pile 1 is constructed by rotary drilling and drilling. The steel pipe pile 1 uses a total station to stake out the pile position and monitor the deviation, verticality and footage of the steel pipe pile 1 in real time;

S2. The steel pipe pile 1 is connected to the pile and the pile top elevation is controlled to be a negative deviation;

S3. After the steel pipe piles 1 are sunk in place, carry out parallel connection and diagonal bracing between the row of steel pipe piles to increase the stability of the piles.

S4. Adjust the elevation of the top of the steel pipe pile 1, construct the beam 2 on the top of the pile, and weld the beam 2 to the steel pipe pile 1.

S5. Hoist the Bailey longitudinal beam truss unit in pieces, and use temporary support to prevent the side from toppling over, install the truss pin 31, and complete the longitudinal connection between the first truss unit and the second truss unit.

S6. Install the reinforcing support frame 32 in bulk, and use the support bolt 33 to connect the Bailey longitudinal beam horizontally.

S7. Install the lateral limit frame 34 on both sides of the Bailey longitudinal beam and weld it to the beam 2.

S8. Position and install the corbel and track beams in sequence, and carry out 1.1 times overload preloading on the sliding support structure.

S9. After the preloading is qualified, position and install the rails, control the straightness, rail spacing, and misalignment of the rail joints, and meet the conditions for sliding equipment to fall off the rails.

Referring to Fig. 1～Fig. 2, the sliding supporting structure of the present invention adopts the support system that steel pipe pile and Bailey beam combine, and this sliding supporting structure is made up of steel pipe pile 1, crossbeam 2, Bailey longitudinal beam 3, corbel 4 , track beam 5, steel rail 6 and sliding equipment 7; the steel pipe pile 1 is the foundation of the sliding support structure, and adopts spiral welded steel pipe; A stiffening plate 21 is provided on the side; the corbel 4 is an H-shaped steel fixedly arranged on the Bailey longitudinal beam 3 and perpendicular to the axis of the steel bridge; the track beam 5 is an H-shaped steel structure placed on the flange of the corbel 4 The upper side is welded to the upper flange of the corbel 4; the rail 6 is placed on the upper part of the track beam 5 and arranged flush with its midline, and the rail 6 and the track beam 5 are fixed by clamping plate 61; the sliding device 7 is placed on the upper side of the rail 6 for the sliding construction of the steel box girder; the lateral limit bracket 34 is placed on both sides of the Bailey frame and welded on the upper side of the beam 2 to prevent the Bailey longitudinal beam from laterally shifting.

Referring to Figures 3 to 4, the Bailey longitudinal beam 3 is composed of a first truss unit 35, a second truss unit 36, a truss pin 31, a reinforcing support frame 32, a support bolt 33, and a lateral limit bracket 34. ; The first truss unit 35 and the second truss unit 36 adopt standard Bailey truss units, the male and female ends between the first truss unit 35 and the second truss unit 36 are connected by truss pins 31, and the truss units are supplemented The strong support frame 32 is connected horizontally; the lateral limit bracket 34 is placed on both sides of the Bailey frame and welded on the upper side of the beam 2 to prevent the lateral deviation of the Bailey longitudinal beam; the truss pin 31 is a special machine Processing pin shafts are used to connect the male and female heads of the truss units; the reinforcement support frame 32 is composed of channel steel or angle steel welded, and the Bailey truss units are connected horizontally through the support bolts 33 .

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 (8)

1. A method for setting up the sliding support structure of an extra-large steel bridge section is characterized in that the steel pipe pile of the parallel connection is used to set the sliding support structure of the crossbeam and Bailey longitudinal beam combination, and the specific setting up comprises the following steps: S1. Rotary excavation is used to drill holes to construct steel pipe piles, and the steel pipe piles are staked out by a total station and real-time monitoring of steel pipe pile deviation, verticality and footage; S2. The top elevation of the steel pipe pile is determined by sliding linear interpolation in combination with the height of the sliding equipment, steel rails, track beams, corbel beams, Bailey longitudinal beams and oil cylinder strokes, and is controlled as a negative deviation; S3. After the steel pipe piles are sunk in place, perform parallel connection and diagonal bracing between the row of steel pipe piles; S4, adjust the top elevation of the steel pipe pile, construct the crossbeam on the top of the pile, and the crossbeam and the steel pipe pile are welded; S5. The truss unit of the Bailey longitudinal beam is hoisted in pieces, and the side is temporarily supported to prevent tipping, and the truss pin is installed to complete the longitudinal connection between the first truss unit and the second truss unit; S6, install the reinforcing support frame, and use the support bolts to connect the Bailey longitudinal beam horizontally; S7. Install the lateral limiters on both sides of the Bailey longitudinal beam and weld them to the beam. The longitudinal arrangement of the Bailey longitudinal beam should place the male and female heads of the truss unit on the upper part of the steel pipe pile and align with the central axis; S8. Position and install the corbel and track beams in sequence, and carry out 1.1 times overload preload on the sliding support structure after erection; S9. After the preloading is qualified, position and install the rails, control the straightness, rail spacing and misalignment of the rail joints, and meet the conditions for sliding equipment to fall off the rails. 2. The erection method of the sliding support structure of the extra-large steel bridge section according to claim 1, wherein the steel pipe piles are rock-socketed piles, and the embedding depth is determined according to the design requirements. 3. The erection method of the sliding support structure of the extra-large steel bridge section according to claim 1, wherein the Bailey longitudinal beam is composed of several standard 321 truss units connected horizontally and vertically, and the distance between the truss units is 200mm. 4. according to the erection method of the sliding support structure of the super large steel bridge section of claim 1, it is characterized in that the reinforcing support frame is installed at the joint of the truss unit, and is bolted by standard 321 Bailey frame support bolts, The diameter of the bolt holes opened is 24mm, and the hole spacing is 200mm. 5. The erection method of the sliding support structure of the extra-large steel bridge section according to claim 1, characterized in that the length of the truss pin is 1/2 of the width of the Bailey longitudinal beam, and the truss hole is driven from the outside when connecting. 6. The erection method of the sliding support structure of the extra-large steel bridge section according to claim 1, characterized in that the distance between the corbels is 1.5m. 7. The erection method of the sliding support structure of the extra-large steel bridge section according to claim 1, characterized in that the elevation of the rail is determined according to slip line interpolation, and the distance between rail clamping plates of the rail is 0.5m. 8. According to claim 1 or claim 2, the erection method of the sliding support structure of the extra-large steel bridge section is characterized in that the steel pipe piles are connected in parallel through steel pipes or double channel steel, and the distance between the steel pipe piles is It is a multiple of the standard length of the Bailey truss unit of 3m and not greater than 12m.

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