CN105780659A - Lifting appliance special for erection of large-tonnage steel box beam segment in non-stayed cable area of cable-stayed bridge - Google Patents

Abstract

The invention discloses a lifting appliance special for erection of a large-tonnage steel box beam segment in a non-stayed cable area of a cable-stayed bridge. The lifting appliance comprises floating crane plate hooks and a lifting frame located below the floating crane plate hooks. The floating crane plate hooks and the lifting frame are connected through upper bearing cables. Lower bearing cables which can be connected with lifting lugs on the top surface of the steel box beam segment are arranged at the bottom of the lifting frame. The lifting frame comprises a plurality of adjustment segments. All the adjustment segments are connected through flanges, so that a frame structure is formed. The lifting appliance is formed by combining the adjustable segments and is suitable for various interval dimensions between the lifting lugs of the steel box beam segment and extremely convenient to use; the time spent on repeated lifting on site when a method that the steel box beam in the non-stayed cable area is manufactured piece by piece and installed into a whole piece by piece is adopted is saved, the construction period is shortened, the installation precision of the steel box beam segment is improved, and the welding stress is reduced to the maximum extent; and meanwhile, the situation that deformation is caused due to the fact that the steel box beam is directly hung on a steel wire rope to be lifted is avoided.

Description

A special hoisting spreader for segmental erection of large-tonnage steel box girder in cable-free area of cable-stayed bridge

technical field

The invention is used in the technical field of bridge construction, and in particular relates to a special hoisting spreader for erecting large-tonnage steel box girder segments in cable-free areas of cable-stayed bridges.

Background technique

With the large-scale development of my country's traffic road network, the construction of cable-stayed bridges appears frequently. The hoisting of steel box girder sections in the cable zone directly affects the safety, progress and overall alignment of the bridge construction, and it is the most important part of the research in the construction stage.

There are two conventional installation methods for steel box girder sections in the cable-free area: 1. Manufacturing in blocks and installation in blocks as a whole. Installation method: divide the steel box girder sections in the cable-free area into several small segments After processing, the small steel box girders are hoisted to the mounting bracket in turn, and the surveyors will measure and monitor the steel box girders according to the design position, and then assemble and weld the small steel box girders into a whole. 3 sections, and finally connect the 3-section steel box girder into a whole; 2. Steel wire rope hoisting segment installation method: use the steel wire rope to directly hook the four lifting lugs of the steel box girder for overall hoisting, and then adjust the steel box girder to the design position.

Disadvantages of existing technology:

1. Disadvantages of block manufacturing and block installation as a whole installation method:

1) It takes a long time to divide the steel box girder section into several small pieces and hoist them one by one to form a whole, which will delay the construction period, and multiple hoistings will easily cause error accumulation and welding residual stress, which will cause large deviations in installation. Installation accuracy is difficult to guarantee.

2) The installation bracket needs to be built as a high-altitude large-area bracket and platform, which consumes materials and labor, and the construction cost is high.

2. Disadvantages of the installation method of the wire rope hoisting segment:

1) The steel box girder is hoisted by the direct hook of the steel wire rope in the floating crane. The steel box girder will bear large longitudinal and transverse horizontal forces. For the design of large steel box girder segments, the longitudinal and vertical forces are mainly considered, and the The force is small, so it is easy to cause deformation of the steel box girder structure.

2) The floating crane is directly tied to the wire rope for hoisting. The angle between the wire rope and the horizontal plane is small, and the force on the wire rope is large. In the case of ensuring the safety factor, the diameter of the wire rope needs to be increased, which increases the construction cost.

Contents of the invention

In order to solve the above problems, the present invention provides a special hoisting spreader for the erection of large-tonnage steel box girder segments in the cable-free area of a cable-stayed bridge, which can avoid the use of block-by-block manufacturing of steel box girders in the cable-free area. It can better control the installation accuracy of the steel box girder section and reduce the welding stress as much as possible; at the same time, it can avoid the deformation caused by the steel wire rope being directly tied to the steel box girder for hoisting.

The technical solution adopted by the present invention to solve the technical problem is: a special hoisting spreader for the erection of large-tonnage steel box girder segments in the cable-free area of a cable-stayed bridge, including a floating suspension hook and a lifting frame located below the floating suspension hook , the hook of the floating hanging plate is connected to the lifting frame through an upper load-bearing cable, the bottom of the lifting frame is provided with a lower load-bearing cable that can be connected to the lifting lug on the top surface of the steel box girder section, and the lifting frame includes several adjustment segments, Each adjustment section adopts flange connection to form a frame structure.

As a further improvement of the technical solution of the present invention, the lifting frame includes a main beam arranged horizontally and a subbeam arranged vertically, the main beam and the subbeam are connected to form a rectangular frame structure, and the main beam includes several The connected main adjustment section, the auxiliary beam includes several auxiliary adjustment sections connected in sequence by auxiliary flanges.

As a further improvement of the technical solution of the present invention, the main beam is provided with two, and the sub-beam is provided with two and connected between the two main beams respectively, and the two ends of the main beam are provided with vertical notches, and the notches The side wall of the side wall is provided with a pin hole, and a first pin shaft is inserted in the pin hole, and the first pin shaft forms a hanging point that can connect the upper load-bearing cable and the lower load-bearing cable.

As a further improvement of the technical solution of the present invention, the main adjustment section and the auxiliary adjustment section are both made of steel pipes, and the two ends of the main beam are provided with radial slits, and two vertical steel plates are welded in the slits. The main beam is notched between two steel plates.

As a further improvement of the technical solution of the present invention, the four corners of the lifting frame are provided with stiffening beams between the main girder and the auxiliary girder.

As a further improvement of the technical solution of the present invention, the lower load-bearing cable includes a first steel wire rope, which is hung on the first pin shaft after being folded in half, and the two ends of the first steel wire rope are respectively folded back and fastened by fasteners to form two steel wire ropes. The first lifting rings, the second pin shafts that can be connected with the lifting lugs on the top surface of the steel box girder section are passed through the two first lifting rings.

As a further improvement of the technical solution of the present invention, the floating suspension hook is provided with third pins respectively corresponding to the first pins, and the upper load-bearing cable includes a second steel wire rope connected to the third pins and The third steel wire rope connected with the first pin shaft, the lower end of the second steel wire rope is connected with the upper end of the third steel wire rope through a snap ring.

As a further improvement of the technical solution of the present invention, the second steel wire rope is folded in half and hung on the third pin shaft, and the two ends of the second steel wire rope are respectively folded back and fastened by fasteners to form two second suspension rings, and the second steel wire rope passes through The second lifting ring is connected to the snap ring.

As a further improvement of the technical solution of the present invention, the two ends of the third steel wire rope are respectively folded back and then fastened by fasteners to form two third suspension rings, the third suspension ring at the upper end of the third steel wire rope is connected to the snap ring, and the third steel wire rope The third suspension ring at the lower end is connected on the first bearing pin.

As a further improvement of the technical solution of the present invention, a movable pulley around which a hoisting rope is wound is arranged on the top of the hook of the floating suspension plate.

Beneficial effects of the present invention:

(1) Reduced the delay in multiple hoisting on site in the method of manufacturing steel box girders in the cable-free area in blocks and installing them in blocks as a whole, shortened the construction period, and improved the installation accuracy of steel box girder segments;

(2) Effectively avoid the structural deformation caused by the steel box girder hoisting method of the steel wire rope hoisting section installation method;

(3) The frame structure is composed of adjustable segments, which is suitable for various steel box girder segment lug spacing dimensions, which is very convenient. The material of the spreader is simple, which are commonly used materials in construction, and the processing cost is relatively low. In addition, the hook is convenient and the operation is simple. The design force of the spreader is clear, giving full play to the high-strength properties of steel and reducing the structural section.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is a front view of the structure of the present invention;

Fig. 2 is a top view of the structure of the present invention.

detailed description

With reference to Fig. 1, Fig. 2, it has shown the specific structure of preferred embodiment of the present invention. The structural features of each element of the present invention will be described in detail below, and if there is description to direction (up, down, left, right, front and back), it is described with reference to the structure shown in Fig. 1, but the actual The direction of use is not limited to this.

The present invention provides a special hoisting sling for erecting large-tonnage steel box girder segments in the cable-free area of a cable-stayed bridge, which includes a floating hanging plate hook 1 and a lifting frame 2 located below the floating hanging plate hook 1, and the floating hanging plate The top of the hook 1 is provided with a movable pulley 3 that is wound with a hoisting rope. The floating hanging plate hook 1 is connected to the lifting frame 2 through the upper load-bearing cable 4, and the bottom of the lifting frame 2 is provided with a lower load-bearing cable 5 that can be connected with the lifting lug on the top surface of the steel box girder segment. The lifting frame 2 includes A number of adjustment segments, each adjustment segment is connected by flanges to form a frame structure, which is composed of adjustable segments, suitable for various lug spacing sizes, very convenient.

Wherein, the lifting frame 2 includes a main beam 21 arranged horizontally and a sub-beam 22 arranged vertically, the main beam 21 and the sub-beam 22 are connected to form a rectangular frame structure, and the main beam 21 includes several The connected main adjustment section, the auxiliary beam 22 includes several auxiliary adjustment sections connected in sequence by the auxiliary flange 24 . Described main beam 21 is provided with two, and secondary beam 22 is provided with two and is connected between two main beams 21 respectively, and the two ends of described main beam 21 are provided with vertical notch 25, and the side wall of notch 25 There is a pin hole, and the first pin shaft 26 is inserted in the pin hole, and the first pin shaft 26 forms a hanging point that can connect the upper load-bearing cable 4 and the lower load-bearing cable 5, and the spreader uses the rotation of the pin shaft to carry the load A little different lengths of cable 4 and lower load-bearing cable 5 ensure that it is evenly stressed and ensure construction and installation. Both the main adjustment section and the auxiliary adjustment section are made of steel pipes. The two ends of the main beam 21 are provided with radial cutouts, and two vertical steel plates are welded in the cutouts. The main beam 21 is between the two steel plates. Notches 25 are formed. The four corners of the lifting frame 2 are provided with stiffening beams 27 between the main beam 21 and the auxiliary beam 22. The stiffening beams 27 are formed by welded section steel. The materials of the present invention are simple and are commonly used materials in construction, and the processing cost is relatively low. In addition, the hook is convenient and the operation is simple.

The lower load-bearing cable 5 includes a first steel wire rope, which is folded in half and hung on the first pin shaft 26, and the two ends of the first steel wire rope are respectively folded back and fastened by fasteners to form two first suspension rings, and the two second steel ropes A second pin shaft that can be connected with the lifting lug on the top surface of the steel box girder section is passed through the first lifting ring. The floating suspension hook 1 is provided with third pins 11 corresponding to the first pins 26 respectively, and the upper bearing cable 4 includes a second steel wire rope 41 connected with the third pins 11 and a second steel wire rope 41 connected with the first pins 26. The pin 26 is connected to the third wire rope 42 , and the lower end of the second wire rope 41 is connected to the upper end of the third wire rope 42 through a snap ring 43 . The second steel wire rope 41 is folded in half and hung on the third pin shaft 11, and the two ends of the second steel wire rope 41 are respectively folded back and fastened by fasteners to form two second suspension rings. The second steel wire rope 41 is connected to the On the snap ring 43. The two ends of the third steel wire rope 42 are folded back respectively to form two third suspension rings by fasteners. The third suspension ring at the upper end of the third steel wire rope 42 is connected to the snap ring 43, and the third suspension ring at the lower end of the third steel wire rope 42 is Connected to the first pin shaft 26.

The invention has clear stress, fully utilizes the high-strength properties of steel materials, and reduces structural sections. The steel wire rope material has high strength and great ability to withstand axial force; the rotation of the pin shaft only transmits the axial force and does not transmit the bending moment, and transmits the vertical and horizontal forces to the hoisting frame, and utilizes the high strength of the main girder and auxiliary girder steel of the spreader , can resist the vertical and horizontal forces generated during hoisting, and the cross-section is small; the first pin shaft 26 and the third pin shaft 11 are quenched and tempered with No. 45 steel, and their shear strength is high, so that they will not bend when they are stressed. It is only subject to shear force, ensuring construction safety.

When using the present invention to erect steel box girders, the steel box girders are first processed and manufactured. In order to control the installation line shape of the steel box girders, the factory completes segmental processing and pre-assembles and adjusts 6 to 8 segments together. After acceptance, the single segment Sections are transported to the site by ship. After checking the safety and reliability of all hoisting equipment, hook the steel box girder and prepare for hoisting. When hooking the hook, the floating crane is a non-rotary fixed pick-up jib, the main hook for lifting is a double hook, and the double hook is replaced with a plate hook structure, and four directions of the floating hanging plate hook 1 are tied with the third pin shaft 11 in four directions. The second steel rope 41, the second suspension ring after the second steel rope 41 is folded in half is connected to the third suspension ring at the upper end of the third steel rope 42 through the snap ring 43, and the third suspension ring at the lower end of the third steel rope 42 is connected to the lifting frame 2 through the first pin shaft 26 . Fold the first wire rope in half and hang it on the first pin shaft 26 in the notch 25, and the two first suspension rings of the first wire rope are connected with the lifting lugs on the top surface of the steel box girder through the second pin shaft. Use a large floating crane to hoist the steel box girder section in the cable-free area as a whole. After the steel box girder section is hoisted 50cm away from the transport ship, let it stand for a period of time, check whether there is any abnormality in the spreader, steel wire rope, and snap ring, and check the dimensions of the beam body , whether there is deformation, continue to lift after ensuring that everything is normal, and hoist the steel box girder segment in the cable-free area to the design position. After adjusting the position, drop the hook, and hoist the remaining 2-segment steel box girder according to the above method.

Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art can also make equivalent modifications or replacements without violating the spirit of the present invention. These equivalent modifications or replacements are all included in the claims of this application. within a limited range.

Claims (10)

1. A special hoisting spreader for erecting a large-tonnage steel box girder segment in a cable-free area of a cable-stayed bridge, characterized in that: it comprises a floating hanging plate hook and a lifting frame positioned below the floating hanging plate hook, and the floating hanging plate hook It is connected with the lifting frame through the upper load-bearing cable. The bottom of the lifting frame is provided with a lower load-bearing cable that can be connected with the lifting lug on the top surface of the steel box girder section. The lifting frame includes several adjustment segments, and each adjustment segment adopts a flange The connections form a frame structure. 2. The special hoisting spreader for erecting large-tonnage steel box girder segments in the cable-free area of a cable-stayed bridge according to claim 1, wherein the hoisting frame includes a main girder arranged horizontally and an auxiliary girder arranged vertically, The main beam and the auxiliary beam are connected to form a rectangular frame structure, the main beam includes several main adjustment segments sequentially connected by main flanges, and the auxiliary beam includes several auxiliary adjustment segments sequentially connected by auxiliary flanges. 3. The special hoisting spreader for erecting large-tonnage steel box girder segments in the cable-free area of a cable-stayed bridge according to claim 2, characterized in that: the main girder is provided with two, and the sub-beam is provided with two and are respectively connected to Between the two main girders, vertical notches are provided at both ends of the main girders, pin holes are provided on the side walls of the notches, and first pin shafts are inserted in the pin holes, and the first pin shafts form a Connect the hanging point of the upper load-bearing cable and the lower load-bearing cable. 4. The special hoisting spreader for erecting large tonnage steel box girder sections in the cable-free area of a cable-stayed bridge according to claim 3, characterized in that: the main adjustment section and the auxiliary adjustment section are both made of steel pipes, The two ends of the main beam are provided with radial slits, and two vertical steel plates are welded in the slits, and the main beam forms a notch between the two steel plates. 5. The special hoisting spreader for erecting large-tonnage steel box girder segments in the cable-free area of a cable-stayed bridge according to claim 3, characterized in that: the four corners of the hoisting frame are provided with stiffening beams between the main girder and the auxiliary girder. 6. The special hoisting spreader for erecting large-tonnage steel box girder segments in the cable-free area of a cable-stayed bridge according to claim 3, characterized in that: the lower load-bearing cable includes a first steel wire rope, and the first steel wire rope is folded in half and hung on the On the first pin shaft, the two ends of the first steel wire rope are respectively folded back and fastened by fasteners to form two first suspension rings, and the first suspension rings that can be connected with the lifting lugs on the top surface of the steel box girder section are passed through the two first suspension rings. Two pins. 7. The special hoisting spreader for erecting large-tonnage steel box girder segments in the cable-free area of a cable-stayed bridge according to claim 3, characterized in that: the hooks of the floating suspension plate are respectively provided with the first pin shafts Corresponding to the third pin shaft, the upper load-bearing rope includes a second steel wire rope connected with the third pin shaft and a third steel wire rope connected with the first pin shaft, the lower end of the second steel wire rope and the upper end of the third steel wire rope pass through the clamp ring connection. 8. The special hoisting spreader for erecting large tonnage steel box girder segments in the cable-free area of a cable-stayed bridge according to claim 7, characterized in that: the second steel wire rope is folded in half and hung on the third pin, and the second The two ends of the steel wire rope are respectively folded back and fastened by fasteners to form two second suspension rings, and the second steel wire rope is connected to the snap ring through the second suspension rings. 9. The special hoisting spreader for erecting large-tonnage steel box girder segments in the cable-free area of a cable-stayed bridge according to claim 7, characterized in that: the two ends of the third steel wire rope are respectively folded back and fastened by fasteners Two third suspension rings are formed, the third suspension ring at the upper end of the third steel wire rope is connected to the clasp, and the third suspension ring at the lower end of the third steel wire rope is connected to the first bearing pin. 10. The special hoisting spreader for erecting large-tonnage steel box girder segments in the cable-free area of a cable-stayed bridge according to claim 1, wherein a movable pulley with a hoisting rope is installed on the top of the hook of the floating suspension plate.