CN216891994U

CN216891994U - Three-span cable crane for mounting main beam of cable-stayed bridge

Info

Publication number: CN216891994U
Application number: CN202120969077.5U
Authority: CN
Inventors: 陈玉良; 周旭; 刁先觉; 凌华焜
Original assignee: Road and Bridge International Co Ltd; Road and Bridge South China Engineering Co Ltd
Current assignee: Road and Bridge International Co Ltd; Road and Bridge South China Engineering Co Ltd
Priority date: 2021-05-07
Filing date: 2021-05-07
Publication date: 2022-07-05
Anticipated expiration: 2031-05-07

Abstract

The application provides a three span cable loop wheel machines for cable-stay bridge girder installation, it is including locating the bridge along the bridge to the cable on the central line, pylon and earth anchor respectively establish a set ofly in the bridge both sides, the top of pylon is equipped with the cable saddle, the cable saddle and the ground anchor department of being connected to at two pylon tops are passed through at the both ends of cable, and the cable middle part supports through the cable saddle of locating on two cable towers of bridge, the both sides that the cable is located every cable tower are equipped with the running gear who is used as hoist and mount or balanced cable tower horizontal atress. The three-span cable crane is adopted to realize the vertical hoisting of all the beam sections, the cooperation of a floating crane, a large-scale sliding beam and a beam storage support is not needed, the control of the construction period is facilitated, large-scale hoisting equipment is not needed to be erected on the bridge floor, the problem of splicing and slab staggering caused by inconsistent transverse deformation of beam section matching is effectively reduced, the harm of additional stress of welding seams is reduced, other temporary loads on the bridge floor are reduced, and the cable force of a stay cable and the linear control of a main beam are facilitated.

Description

Three-span cable crane for mounting main beam of cable-stayed bridge

Technical Field

The application relates to the technical field of bridge construction, in particular to a three-span cable crane for installing a main beam of a cable-stayed bridge.

Background

The cable-stayed bridge has good anti-seismic performance and economic performance, and has a great position in the field of bridge construction in China. However, the construction of cable-stayed bridges has many technical difficulties. Along with the increase of cable-stay bridge span and the main tower height increase, cable-stay bridge construction stage structural stability reduces gradually, and the steel truss erects the degree of difficulty and also increases thereupon. Therefore, the cable-stayed bridge with a large span is easy to damage due to instability before being folded. Therefore, in the construction stage of the cable-stayed bridge, the construction progress for accelerating the hoisting of the steel truss girder and the steel box girder is very critical.

The traditional construction method is usually long in construction period and high in construction difficulty, and economic cost and time cost of bridge construction are increased. The cable crane uses flexible steel cable as a large-span overhead bearing member for the load-carrying trolley for suspending heavy objects to move back and forth on the bearing cable, and the goods are horizontally or vertically transported. At present, although a cable crane is applied to bridge construction, at present, only a bridge midspan needs to be constructed, a bridge deck crane is still needed for a secondary side span, the navigation space of the bridge side span is small, a floating crane is often needed to be used for hoisting from the middle side span, and a large-scale sliding beam and a beam storage support are erected and installed in place.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a three-span cable crane for installing a main beam of a cable-stayed bridge, which is simple in structure and convenient and fast to construct.

In order to achieve the above object, the present application provides the following technical solutions:

the application relates to a three-span cable crane for installing a main beam of a cable-stayed bridge, which comprises a cable arranged on the center line of the bridge along the bridge direction, a tower frame and a ground anchor, the tower and the ground anchor are respectively arranged at two sides of the bridge in a group, the top of the tower is provided with a cable saddle, the two ends of the cable are connected to the ground anchor through cable saddles at the tops of the two towers, the middle part of the cable is supported by cable saddles arranged on two cable towers of the bridge, the two sides of the cable positioned on each cable tower are provided with operating mechanisms used for hoisting or balancing the horizontal stress of the cable towers, the operating mechanism comprises a hoisting trolley, a hoisting system and a traction system, the hoisting system is arranged on the hoisting trolley and is used for hoisting the beam section, the traction system is connected with the hoisting trolley to pull the hoisting trolley to move along the cable, and the hoisting trolley is further provided with a counterweight frame.

Further setting: the tower is located at the intersection of the side span cast-in-place beam and the approach bridge, the tower is of a steel pipe truss structure, the steel pipe truss structure comprises a stand column, a parallel connection and an inclined strut, the stand column adopts steel pipe piles, the parallel connection extends in the horizontal direction and is connected with a plurality of steel pipe piles in the same row or the same column, and the inclined strut is obliquely arranged between two adjacent parallel connections.

Further setting: the bottom of the tower is provided with an embedded steel pipe embedded in the ground anchor.

Further setting: the earth anchor is gravity type concrete anchorage structure, and it includes anchorage and tubular pile basis, tubular pile basis is buried underground in the anchorage, just the anchorage is the frame construction that can backfill sand.

Further setting: and a middle box chamber for pouring concrete and balancing sand is arranged in the frame structure of the anchorage.

Further setting: the tubular pile foundation comprises a plurality of bearing steel pipes which are obliquely arranged.

Further setting: the cable saddle includes cable saddle and cable saddle wheel, cable saddle wheel is equipped with a plurality ofly along the cross-bridge to, just be equipped with in the cable saddle along the cross-bridge to extending and connecting a plurality ofly the round pin axle of cable saddle wheel.

Compared with the prior art, the scheme of the application has the following advantages:

1. in the three-span cable crane of the application, the three-span cable crane is innovatively adopted on a cable-stayed bridge, the advantages that the span of the cable crane is large and is not limited by weather and topographic conditions are utilized, the vertical hoisting of all beam sections is realized, floating cranes, large-scale sliding beams and beam storage supports are not needed, the control on the construction period is facilitated, large hoisting equipment does not need to be erected on a bridge floor, the problem that the beam sections are matched and are staggered due to inconsistent transverse deformation can be effectively solved, the harm of additional stress of welding seams is reduced, other temporary loads on the bridge floor are reduced, and the cable force and the linear control of main beams of the cable-stayed bridge are facilitated.

2. In the three-span cable crane of this application, through setting up three sets of hoist and mount dollies respectively on the cable that corresponds at three-span bridge segment, can realize the simultaneous construction of single tower girder segment for the construction progress shortens the engineering time, has improved the construction progress. Meanwhile, the counterweight blocks with adaptive weight can be applied to the counterweight frame of the hoisting trolley to balance the horizontal tension generated by the beam sections mounted on the two sides of the cable tower at the other end, so that the stability of the cable tower in the construction process is ensured, and the condition that the cable tower is deflected is reduced.

3. In the three-span cable crane of the application, the vertical hoisting of the beam section is realized by adopting the cable crane, large-scale hoisting equipment is not required to be arranged on the bridge floor, the problem of splicing and slab staggering caused by inconsistent transverse deformation of beam section matching can be effectively reduced, the harm of welding seam additional stress is reduced, and the control of cable force of an inclined stay cable and the linear type of a main beam can be facilitated due to the reduction of the load of the bridge floor.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic view of an embodiment of a three span cable hoist of the present application;

FIG. 2 is a schematic structural view of a tower in the three-span cable crane of the present application;

FIG. 3 is a schematic structural view of a cable saddle of the three-span cable crane of the present application;

fig. 4 is a schematic structural view of the ground anchor in the three-span cable crane of the present application.

In the figure, 1, cable; 2. a tower; 21. a column; 22. parallel connection; 23. bracing; 24. pre-burying a steel pipe; 25. a sliding track; 3. a ground anchor; 31. anchorage; 32. a pipe pile foundation; 33. an intermediate compartment; 4. an operation mechanism; 41. hoisting a trolley; 42. hoisting a rope; 5. a cable saddle; 51. a cable saddle; 52. a pin shaft; 53. a cable saddle wheel; 54. a guide wheel.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

Please refer to fig. 1 to 4 in combination, and to the problem that the beam transportation ship cannot normally transport the beam section construction due to the small navigation clearance below the bridge in the beam section installation construction process of the existing bridge, the application provides a three-span cable crane, which realizes the vertical hoisting of all the beam sections, does not need the cooperation of a floating crane, a large-scale sliding beam and a beam storage bracket, is convenient to construct, and can ensure that the deflection of a cable tower is within the early warning range and the safety is high in the construction process.

It should be noted that the bridge constructed in the present application is a double-tower double-cable-plane hybrid beam cable-stayed bridge, wherein the mid-span and the secondary side span of the main bridge are steel-concrete composite beams of a UHPC bridge deck, and the side span is a concrete beam. Specifically, in the embodiment, the double-tower double-cable-plane hybrid beam cable-stayed bridge is provided with the bridge piers and the cable towers, and then the three-span cable crane is installed to hoist the beam sections and complete the construction of the bridge. In addition, the three spans are the construction sections of the three-span bridge divided by taking two cable towers as dividing points.

The three-span cable crane comprises a cable 1, a tower 2 and a ground anchor 3 which are arranged on a bridge along the center line of the bridge along the direction of the bridge, wherein the tower 2 and the ground anchor 3 are respectively arranged at two sides of the bridge in a group, a cable saddle 5 is arranged at the top of the tower 2, a cable saddle 5 is also arranged at the middle cross beam of two cable towers of the bridge, two ends of the cable 1 are connected to the ground anchor 3 through the cable saddles 5 at the tops of the tower tops of the two tower frames, the middle part of the cable 1 can be supported through the cable saddle 5 arranged at the middle cross beam of the cable tower, the cable 1 is also provided with operation mechanisms 4 used for hoisting beam sections or balancing the horizontal stress of the cable tower at two sides of each cable tower, the vertical hoisting of the beam sections is realized through the operation mechanisms 4, the cable 1 is divided into three-span bridge construction sections through the cable saddles 5 of the two cable towers, namely, the operation mechanisms 4 are respectively arranged at the three construction sections of the cable 1 to synchronously transport and hoist the beam sections, when the operation mechanism 4 does not need to hoist the beam section, the operation mechanism 4 can be weighted to balance the horizontal stress on two sides of the cable tower.

Specifically, the operating mechanism 4 includes a hoisting trolley 41, a hoisting system and a traction system (not shown), where the hoisting system includes a hoisting cable 42 and a winch (not shown) disposed on the hoisting trolley 41 and connected to the hoisting cable 42, so as to implement hoisting or lowering of the beam segment along the hoisting cable 42 by winding and unwinding the hoisting cable 42 through the winch. The traction system comprises a pair of traction ropes respectively connected with two ends of the hoisting trolley 41 and a traction winch connected with the traction ropes, so that the traction ropes are wound and released through the traction winch to drive the hoisting trolley 41 to move along the cable 1, the beam section can be vertically hoisted and transported to a corresponding construction position, other large temporary supports do not need to be additionally arranged, and construction steps are optimized.

In addition, still be equipped with counter weight frame (not shown in the figure) on the hoist trolley 41, because this application three-span bridge construction section divides as the division point with two cable towers, then the construction length of three-span construction section is different, after partial construction section construction is accomplished, still have the construction section not to accomplish, then can be equipped with the balancing weight of different weight in the counter weight frame of hoist trolley 41 that need not hoist beam section this moment and come the horizontal pulling force of balanced cable tower both sides cable 1, this application utilizes the symmetrical installation method can realize the synchronous hanging beam construction of bridge three-span promptly, thereby improve the efficiency of construction, and this application adopts the synchronous hanging beam construction of three-span or counter weight mainly to guarantee that the incline of cable tower is in the early warning scope, when making hoist trolley 41 on the bridge three-span hoist simultaneously, independent hoist and mount need not receive the distance control of hanging beam.

Referring to fig. 3, a cable saddle 5 disposed on the cable tower is used for supporting the cable 1 and guiding the cable 1, the cable saddle 5 is mounted on the top of the tower and on the middle cross beam of the cable tower, the cable saddle 5 includes a cable saddle 51, a pin 52 and a cable saddle wheel 53, the pin 52 extends along the cross bridge direction, the cable saddle wheels 53 are disposed side by side along the length direction of the pin 52, and a plurality of cable saddle wheels 53 are rotatably mounted on the pin 52, and at the same time, two ends of the pin 52 are fixed on the cable saddle 51 to prevent the pin 52 from rotating along with the rotation of the cable saddle wheels 53. In addition, the saddle wheels 53 are provided in two sets along the bridge direction to improve the holding and guiding ability of the cable 1 by the saddle 5. The top of the cable saddle 51 is further provided with a guide wheel 54, and a traction rope for drawing the hoisting trolley 41 passes through the guide wheel 54 to improve the walking stability of the hoisting trolley 41.

Preferably, the tower 2 of the present application is preferably a steel pipe truss structure, and the steel pipe truss structure is mainly formed by steel pipe piles. Specifically, the tower 2 comprises a vertical column 21, a parallel connection 22 and an inclined strut 23, wherein the vertical column 21 adopts a steel pipe pile, and the parallel connection 22 preferably adopts a steel pipe pile

The parallel connection 22 extends along the horizontal direction and is connected with the steel pipe piles in the same row or the same column, and the inclined strut 23 is arranged between two adjacent parallel connections 22 to enhance the structural strength of the parallel connection 22, and in this embodiment, a double-spliced 20# steel pipe is preferably used as the inclined strut 23. The bottom of the tower 2 is also provided with an embedded steel pipe 24 embedded in the ground anchor 3, so that the structural stability of the tower 2 is further improved, and the tower 2 can provide enough supporting capacity for the cable 1. Secondly, a sliding rail 25 extending along the transverse bridge direction is arranged at the top of the tower 2, and the sliding railThe track 25 is provided with a mounting seat (not shown) for mounting and connecting the end of the cable 1, so that the position of the cable 1 can be adjusted by adjusting the position of the mounting seat on the sliding track 25, and then beam sections at different positions can be hoisted.

In addition, both ends of the cable 1 are connected to the ground anchor 3 after passing through the cable saddle 5 at the top of the tower, the pulling force from the cable 1 is resisted by the ground anchor 3 and is transmitted to the foundation, and good tensile capacity can be provided for the tower 2, so that good supporting capacity can be provided for the cable 1. Specifically, ground anchor 3 locates the route center of bridge approach, and ground anchor 3 in this embodiment adopts gravity type concrete anchorage 31 structure, and it includes anchorage 31 and tubular pile basis 32, tubular pile basis 32 is buried underground in anchorage 31 to carry out the bearing to anchorage 31 and prevent it from sinking, just anchorage 31 is the frame construction that can backfill sand. An intermediate box chamber 33 for pouring concrete is further arranged in the frame structure of the anchorage 31, and the intermediate box chamber 33 is arranged at the symmetric center of the frame structure, so that the lateral compression of a soil body can be effectively eliminated, the horizontal displacement of the anchorage 31 is prevented, and the passive soil pressure is provided. Tubular pile basis 32 includes that many diameters are 820mm bearing steel pipes to play the effect that prevents anchorage 31 and subside. Further, the bearing steel pipe in this embodiment is arranged obliquely, and the oblique arrangement of the bearing steel pipe can improve the anti-settling capacity of the anchorage 31.

In addition, in the embodiment, the ground anchor 3 can provide the cable with the tensile capacity of 420T, and when the weight of the beam segment lifted by the hoisting trolley 41 is about 340T, the hoisting trolley 41 on one side of the cable tower and the beam segment lifted by the hoisting trolley 41 exert the horizontal force of about 1379T on the cable tower, and exert the vertical force of about 237T, and the vertical force can be borne by the cable tower. Because the two sides of the cable tower are constructed simultaneously or the counterweight is carried out through the counterweight frame of the hoisting trolley 41 so as to balance the horizontal tension of the two sides of the cable tower, the structural stability of the cable tower is further ensured, and the influence of deviation on the cable tower in the process of constructing the beam end is avoided.

This application adopts three span cable loop wheel machines innovatively on cable-stay bridge, it utilizes 1 hoisting span of cable big, do not receive the advantage of weather and topography condition restriction, realize the perpendicular hoist and mount of all beam sections, need not the floating crane, large-scale sliding beam, deposit the cooperation of roof beam support, be favorable to control time limit for a project, and need not to set up large-scale lifting equipment load at the bridge floor, can reduce the inconsistent problem of piecing together wrong platform that causes of beam section matching transverse deformation effectively, reduce the harm of welding seam additional stress, reduce other interim loads of bridge floor simultaneously, be favorable to cable-stayed force, girder line type control. In addition, the three-span cable crane of this application can realize the simultaneous construction of three-span bridge sections through setting up three sets of hoisting trolley 41 respectively on the cable 1 that corresponds at three-span bridge sections for the construction progress has been shortened engineering time, has improved the construction progress. Meanwhile, when the hoisting construction of the beam end is not needed, the counterweight blocks with adaptive weight can be constructed in the counterweight frame of the hoisting trolley 41 to balance the horizontal tension on the two sides of the cable tower, so that the stability of the cable tower in the construction process is ensured, and the deflection of the cable tower is reduced.

The application also relates to a construction method of the three-span cable crane 1, wherein the three-span cable crane is the three-span cable crane mentioned in the foregoing, and the construction method specifically comprises the following steps:

firstly, constructing the ground anchors 3 at two sides of the bridge, erecting a tower frame 2 at the intersection of the side span cast-in-place beam and the approach bridge of the ground anchors 3 at two sides, and installing the three-span cable crane by utilizing the middle cross beams of the two cable towers. Specifically, when the cable tower is constructed to the middle cross beam, a tower frame 2, a cable saddle 5, a cable 1 and an operation mechanism 4 of the three-span cable crane are sequentially installed along the bridge-direction center line of the bridge, and the tower frame is arranged on the ground anchor 3 and located between the side-span cast-in-place beam and the approach bridge.

The tower 2 is a temporary tower, is erected on the ground anchor 3 and is positioned between the side span cast-in-place beam and the approach bridge, and before installation, an embedded steel pipe 24 can be embedded in the ground anchor, and then the tower is erected on the basis of the embedded steel pipe. The cable saddle 5 is fixed on the top of the tower 2 and the middle cross beam of the cable tower through bolts or bailey pins, then the cable 1 is installed, two ends of the cable 1 are connected to the ground anchor through the cable saddles of the towers at two sides, and the cable 1 is respectively provided with a group of the operation mechanisms 4 corresponding to the construction section of the three-span bridge with two cable towers as dividing points.

Then, after the cable tower construction is completed, the hoisting trolleys 41 on the two sides of each cable tower are synchronously loaded to hoist the beam sections, and particularly, the operation mechanism 4 is used for hoisting the corresponding beam sections to slide on the cable 1 to be installed in place, and then the assembly is carried out.

In the present embodiment, the full-bridge composite girder is divided into 10 types a to H, 91 sections in total, and two pylons in the present embodiment are defined as # 1 pylon and # 2 pylon, respectively. The hoisting of three-span bridge construction section adopts the line production method, installs two cantilever beam sections of 1# cable tower both sides earlier promptly, and the operation mechanism 4 of 2# cable tower's side span department carries out the counter weight simultaneously, carries out the construction of two cantilever beam sections of 2# cable tower both sides again afterwards, and the operation mechanism 4 counter weight of 1# cable tower's side span department simultaneously hoists each beam section of two cable tower both sides at every turn, totally four beam sections.

After the beam section of the 1# cable tower is lifted, installed in place and adjusted and positioned to determine the position of the current beam section, a stiff framework is installed and temporarily bolted, meanwhile, a stay cable is installed and then tensioned, and after tensioning is finished, the limitation of a hoisting system of the operation mechanism 4 on the current beam section can be released. And when the beam section of the 2# cable tower is hoisted, the construction of girth welding, wet joint and secondary tensioning of the beam section of the 1# cable tower can be synchronously performed. And assembling other beam sections alternately according to the assembling steps of the beam sections, and when construction is carried out to the midspan closure section, balancing weights of the operation mechanisms 4 at the two side spans of the bridge at the same time until all the beam sections of the main beam are assembled.

In addition, the wet joint of this application can multiple channel post-cast together to optimize the construction process, be favorable to the control of time limit for a project, the bridge floor does not have other loads to act on the wet joint of newly-watering simultaneously, can effectively reduce its risk of ftractureing, improves the structural stability of bridge.

The double-tower double-cable-surface mixed beam cable-stayed bridge adopts the three-span cable crane for construction, realizes the vertical hoisting of all beam sections, solves the problems that the existing side span has small navigation space, a floating crane is required to be adopted for installation and sliding in place from the side of the midspan, and a beam storage support is not required to be arranged at the same time, avoids the problem that the stress of the beam sections is uneven due to the overlarge local load caused by the load of the support, solves the problem that the support is difficult to erect due to the fact that the secondary span is positioned in a shallow beach area of a river channel and spans an area in a large dike and a dike, and a beam ship can not reach the position under the beam sections, adopts the three-span cable crane without erecting a large-support sliding beam storage beam, realizes the vertical hoisting of the beam sections by adopting the cable crane 1, does not need to erect the load of large-scale hoisting equipment, can effectively reduce the problem that the beam sections are matched with the splicing and staggered platforms caused by the inconsistent transverse deformation, the damage of the additional stress of the welding seam is reduced, and the reduction of the load of the bridge deck is beneficial to the control of the cable force of the inclined stay cable and the linear type of the main beam line. The application has the advantages of simple overall structure, convenience and quickness in construction, high construction speed, shortened construction time and saved construction cost.

The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.

Claims

1. A three-span cable crane for installing main beams of cable-stayed bridges is characterized by comprising a cable, a tower frame and a ground anchor which are arranged on the central line of the bridge along the bridge direction, the tower and the ground anchor are respectively arranged at two sides of the bridge in a group, the top of the tower is provided with a cable saddle, the two ends of the cable are connected to the ground anchor through cable saddles at the tops of the two towers, the middle part of the cable is supported by cable saddles arranged on two cable towers of the bridge, the two sides of the cable positioned on each cable tower are provided with operating mechanisms used for hoisting or balancing the horizontal stress of the cable towers, the operating mechanism comprises a hoisting trolley, a hoisting system and a traction system, the hoisting system is arranged on the hoisting trolley and is used for hoisting the beam section, the traction system is connected with the hoisting trolley to pull the hoisting trolley to move along the cable, and the hoisting trolley is further provided with a counterweight frame.

2. The three-span cable crane for installing the main beam of a cable-stayed bridge according to claim 1, wherein the tower is located at the intersection of a side-span cast-in-place beam and a bridge approach, the tower is of a steel pipe truss structure, the steel pipe truss structure comprises an upright post, a parallel connection and an inclined strut, the upright post is provided with a steel pipe pile, the parallel connection extends in the horizontal direction and is connected with a plurality of steel pipe piles in the same row or the same column, and the inclined strut is obliquely arranged between two adjacent parallel connections.

3. The three-span cable crane for installing the main girder of the cable-stayed bridge according to claim 2, wherein the bottom of the tower frame is provided with an embedded steel pipe embedded on a ground anchor.

4. The three-span cable crane for installing the main girder of the cable-stayed bridge according to claim 1, wherein the ground anchor is a gravity concrete anchorage structure which comprises an anchorage and a tubular pile foundation, the tubular pile foundation is buried in the anchorage, and the anchorage is a frame structure capable of backfilling sandy soil.

5. The three-span cable crane for installing the main girder of the cable-stayed bridge according to claim 4, wherein a middle box chamber for pouring concrete and balancing sand is arranged in the frame structure of the anchorage.

6. The three-span cable crane for installing the main girder of the cable-stayed bridge according to claim 4, wherein the tubular pile foundation comprises a plurality of obliquely arranged bearing steel pipes.

7. The three-span cable crane for installing the main beam of a cable-stayed bridge according to claim 1, wherein the cable saddle comprises a cable saddle and a cable saddle wheel, the cable saddle wheel is provided with a plurality of cable saddle wheels along the transverse bridge direction, and a pin shaft which extends along the transverse bridge direction and is connected with the cable saddle wheels is arranged in the cable saddle.