CN109761137B - Shallow water area steel box girder swinging construction method and system and lifting appliance - Google Patents
Shallow water area steel box girder swinging construction method and system and lifting appliance Download PDFInfo
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- CN109761137B CN109761137B CN201910068973.1A CN201910068973A CN109761137B CN 109761137 B CN109761137 B CN 109761137B CN 201910068973 A CN201910068973 A CN 201910068973A CN 109761137 B CN109761137 B CN 109761137B
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Abstract
The invention provides a shallow water area steel box girder swinging construction method and system and a lifting appliance, which belong to the technical field of suspension bridge steel box girder installation, and the shallow water area steel box girder swinging construction method comprises the following steps: step 1: the cross-cable crane walks to a first hoisting position, and a lifting appliance is lowered to mount the lifting appliance on a steel box girder on a barge right below the cross-cable crane; step 2: the cable-crossing crane lifts the steel box girder to a first swing height of a first permanent sling, and installs the first permanent sling on the lifting appliance, wherein the first swing height is a position where a sling fork lug of the first permanent sling can be installed on the lifting appliance, and the first permanent sling is a permanent sling for carrying out first swing; step 3: the cable-crossing crane gradually reduces the height of the lifting appliance, and the first permanent lifting cable is at a position where the first permanent lifting cable bears the weight of the steel box girder. Compared with the traditional scheme, the swing and movement scheme reduces a large amount of bracket investment, and reduces resource investment for erecting and dismantling the platform.
Description
Technical Field
The invention belongs to the technical field of suspension bridge steel box girder installation, and particularly relates to a shallow water area steel box girder swinging construction method and system and a lifting appliance.
Background
With the high-speed development of the economy in China, the domestic large-span suspension bridge is developed at an unprecedented speed, and the suspension bridge has obvious advantages in large-span bridges such as river crossing, canyon and the like due to the characteristics of the suspension bridge.
The steel box girder of the large-span suspension bridge is generally large in volume and weight. Therefore, the steel box girder is installed by adopting a special cable-crossing crane. In a shoal area or a shallow water riverbed, a barge cannot transport a steel box girder to a hoisting position, and is affected by hoisting conditions, a girder section of a tower area cannot be directly and vertically hoisted by using a cross-cable crane, and a traditional construction method is to set up a platform, set a track to longitudinally move to the hoisting position and then vertically hoist.
In the process of implementing the embodiment of the present invention, the inventors found that at least the following defects exist in the background art:
the construction cost is high when the temporary support is built and the track is arranged for longitudinally moving the steel box girder, the existing resources of the suspension bridge cannot be effectively utilized, the cost is increased, the resource is wasted, the construction time cost is increased when the temporary support is built and the track is arranged, and the construction progress of the suspension bridge is delayed.
Disclosure of Invention
The invention provides a shallow water area steel box girder swinging construction method and system and a lifting appliance, and aims to solve the problems that the construction cost is high, the existing resources of a suspension bridge cannot be effectively utilized, the cost is increased and the resource waste is caused, the construction time cost is increased due to the construction of a temporary support and a track, and the construction progress of the suspension bridge is delayed due to the construction of the temporary support and the track.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a shallow water area steel box girder swinging construction method comprises the following steps:
step 1: the cross-cable crane walks to a first hoisting position, and a lifting appliance is lowered to mount the lifting appliance on a steel box girder on a barge right below the cross-cable crane;
step 2: the cable-crossing crane lifts the steel box girder to a first swing height of a first permanent sling, and installs the first permanent sling on the lifting appliance, wherein the first swing height is a position where a sling fork lug of the first permanent sling can be installed on the lifting appliance, and the first permanent sling is a permanent sling for carrying out first swing;
step 3: the cable-crossing crane gradually reduces the height of the lifting appliance, and the upper fixed end of the first permanent lifting cable is used as an origin to swing and move to a position where the first permanent lifting cable bears the weight of the steel box girder.
Further comprises:
step 4, releasing a certain length of steel stranded wire from the cable crane or detaching the steel box girder and the steel stranded wire of the cable crane from the steel box girder, wherein the releasing of the certain length of steel stranded wire is to allow the steel stranded wire of the cable crane to travel from a first hoisting position to a second hoisting position along a main cable of the suspension bridge under the condition that the steel stranded wire of the cable crane is fixed with a lifting appliance;
step 5: the cable-crossing crane walks from a first hoisting position to a second hoisting position, wherein the second hoisting position is a position on the main cable, which is walked by the cable-crossing crane along the main cable of the suspension bridge and is subjected to second swinging;
step 6: the cable-crossing crane lifts the steel box girder to a second swing height of a second permanent sling, and then installs the second permanent sling on the sling and releases the first permanent sling, wherein the second swing height is a position where the cable-crossing crane fully bears the weight of the steel box girder and sling fork lugs of the second permanent sling can be installed on the sling on the steel box girder, and the second permanent sling is a permanent sling for carrying out second swing;
step 7: and (3) gradually lowering the height of the lifting appliance by the cable-crossing crane, swinging and moving the fixed end above the second permanent lifting rope to the position where the second permanent lifting rope fully bears the weight of the steel box girder by taking the fixed end as an origin, finishing swinging and moving construction when the steel box girder reaches a preset position after the step (7), and continuously repeating the steps (4) to (7) if the steel box girder does not reach the preset position after the step (6).
Between the step 3 and the step 4, further includes:
step 3.1, after the first permanent sling fully bears the weight of the steel box girder, disassembling and assembling the end part of a steel strand of the cross-cable crane from the rear end of the first permanent sling along the swinging direction of the steel box girder to the front end of the first permanent sling;
further comprises:
step 4: the cable-crossing crane walks to a position right above the first permanent sling, and lifts the steel box girder to a second swing height of the second permanent sling, and the second permanent sling is installed after the first permanent sling is released;
step 5: and (3) gradually lowering the lifting appliance height of the cable-crossing crane until the second permanent sling fully bears the weight of the steel box girder, finishing swinging construction when the steel box girder reaches a preset position after the step (5), and walking the cable-crossing crane to a position right above the second permanent sling and repeating the steps from the step (4) to the step (5) if the steel box girder does not reach the preset position after the step (5).
Further comprises:
step 8: connecting a winch on a tower column with a steel box girder of a non-cable area through a pulley block, and after the steel box girder of the non-cable area reaches a preset position, gradually winding ropes through the winch on the tower column, gradually releasing steel strands through a cable-crossing crane, and moving the steel box girder of the non-cable area to a specified position;
and 9, the cross-cable crane swings the steel box girders with the permanent slings to a preset position one by one, and adjusts the steel box girders to an assembly position for fixed assembly.
A spreader, comprising:
a spandrel girder;
a sector plate, wherein at least two connecting holes are formed at one arc end of the sector plate;
the sling fork ear conversion head is used for being detachably connected with the sling fork ear at one end and connected with the Kong Xiaojie at the other end;
the steel strand conversion head is used for being detachably connected with the steel strand at one end and the other end of the steel strand conversion head is connected with the connection Kong Xiaojie;
one end of the circle center of the sector plate is rotationally connected with the spandrel girder.
The sling fork lug conversion head consists of a sling fork lug connecting plate and a first connecting plate, and the sling fork lug connecting plate is detachably and rotatably connected with the sector plate through the first connecting plate and the connecting hole.
The first connecting plate is in a narrow long plate shape, grooves are formed in two ends of the first connecting plate, the side face of the first connecting plate is of an I-shaped structure, and through holes for rotationally connecting the sling fork lug connecting plate and the sector plate are formed in two ends of the first connecting plate respectively;
the sling fork lug connecting plate is triangular plate-shaped;
the tips of three corners of the triangle plate shape of the sling fork lug connecting plate are arc-shaped;
the connecting hole on the sector plate is in pin shaft connection with the detachable connection or the detachable rotation connection of the sling fork lug conversion head and the steel strand conversion head;
the connecting part of the sling fork lug connecting plate is provided with a pin hole and a pin shaft, and the pin shaft and the pin hole are arranged at the connecting part of the sling fork lug connecting plate and the sling fork lug;
the pin hole is in clearance fit with the pin shaft;
the length direction of the sector plates is the same as the length direction of the spandrel girder;
one end of the circle center of the sector plate is rotationally connected with the spandrel girder along the length direction of the spandrel girder;
the two ends of the steel strand conversion head or the sling fork lug connecting plate are in anchor head shape;
the sling fork lug conversion head is detachably fixedly connected or detachably connected with the sling fork lug from the permanent sling;
the steel strand conversion head is detachably fixedly connected or detachably connected with the end part of the steel strand;
when the spandrel girder bears a weight, the connection position of any connecting hole of the sector plate for transmitting the load and the rotation connection position of the sector plate and the spandrel girder is positioned on the gravity center line of the weight.
A second connecting plate is arranged between the spandrel girder and the sector plate, and the spandrel girder is rotationally connected with the sector plate through the second connecting plate;
the bearing beam is rotationally connected with the sector plate through the sliding seat, and a stop part used for limiting the sliding seat and the sliding rail to mutually slide is arranged on the sliding seat.
A shallow water section steel box girder swing construction system, comprising:
a cable-crossing crane;
a main cable of the suspension bridge is provided with a cable-crossing crane;
a first permanent sling secured to the suspension bridge main cable;
a cable hoist using a spreader, a cable hoist, the suspension bridge main cable and the first permanent slings of claim 7 for a shallow water section steel box girder swing construction method of claim 1.
The invention has the beneficial effects that the economy of the installation of the steel box girder in the tower area and the acceleration of the construction progress are considered, and the problem that the water transportation girder section cannot be transported to a designated position is solved. The beam Duan Ji to be installed can be erected in place by several swinging movements using a permanent sling and a swinging movement device. Compared with the traditional scheme, the swing and movement scheme reduces a large amount of bracket investment, reduces resource investment for erecting and dismantling the platform, and quickens the installation and construction progress of the steel box girder.
Drawings
FIG. 1 is a schematic diagram of a swing process of a method for constructing a steel box girder in a shallow water area according to an embodiment of the present invention;
FIG. 2 is an overall block diagram of a spreader according to an embodiment of the present invention;
FIG. 3 is a schematic view showing the assembly and disassembly positions of the steel strand transfer head and the permanent slings during swing construction of the lifting appliance according to an embodiment of the present invention;
FIG. 4 is a schematic drawing of a shallow water area steel box girder swing construction method according to an embodiment of the present invention in a trolley pulling manner in a sling-free area;
FIG. 5 is a schematic diagram illustrating a second swing of a cross-cable crane in a shallow water section steel box girder swing construction method according to another embodiment of the present invention;
marked in the figure as: 1. a cable-crossing crane; 2. steel strand; 3. a first permanent sling; 4. a steel box girder; 5. a first connection plate; 6. a steel strand conversion head; 7. a sector plate; 8. a second connecting plate; 9. a sling fork ear connecting plate; 10. a spandrel girder; 11. a connection hole; 12. a first hoisting position; 13. a second permanent sling; 14. a pin shaft; 15. a sling fork ear; 16. a hoist; 17. a first swing height; 18. a suspension bridge main cable; 19. a second lifting position; 20. a pulley; 21. a slide seat.
Detailed Description
It should be noted first that, in the various embodiments of the present invention, the terms involved are:
the first permanent sling is a permanent sling which is arranged on a suspension bridge used for the first time in the swinging construction.
The second permanent sling is a permanent sling which is arranged on a suspension bridge used for the second swinging and moving in the swinging and moving construction.
The second swinging and moving position is a position selected by a field engineer according to the position of the first permanent sling carrying the steel box girder, the second swinging and moving position is selected to follow the range that the suspension arm or the steel strand does not exceed minus thirty degrees to plus thirty degrees along the vertical direction of the track of the cable crane 1 when the steel box girder 4 swings and moves, the suspension arm of the cable crane 1 is zero degrees at an angle vertical to the track, and the suspension arm is always parallel to the steel strand.
And the third lifting position, namely repeating the operation of the selected position of the second lifting position, so as to select the third lifting position.
The laseless region, i.e., the region near the column cross member of the suspension bridge where the upper end of the steel box girder has no permanent slings.
The spandrel girder 10 is a main body frame of the lifting appliance and is a longer box girder, the bottoms of the two ends of the spandrel girder 10 are fixed with the steel box girder, and the longer the spandrel girder 10 is, the stronger the anti-overturning stability of the steel box girder is.
The sector plate 7 mainly acts as, the fan-shaped centre of a circle one end of sector plate 7 rotates with spandrel girder 10 to be connected, because fan-shaped shape for when sector plate 7 rotates along spandrel girder 10, its turned angle greatly increases, and fan-shaped circular arc one end of sector plate 7, the arc length is longer, can set up a plurality of steel strand wires connecting holes that are used for connecting hoist cable fork ear and striding the cable loop wheel machine, and fan-shaped structure is the preferred structure.
The sling fork lug conversion head is used for connecting and fixing the sling fork lug and the sector plate 7.
And the steel strand conversion head 6 is used for connecting and fixing the steel strands of the cross-cable crane with the sector plate 7.
In fig. 1, a, b, c, d and e are divided into different permanent slings, and in construction, the swing construction can swing across the permanent slings, so that the number of times of swing is reduced.
The following describes a shallow water area steel box girder swing construction scheme provided by the embodiment of the invention in detail through a plurality of specific embodiments.
Referring to fig. 1, a swing-moving process diagram of a moving construction method of a shallow water area steel box girder swing-moving construction scheme according to an embodiment of the invention is shown, and the shallow water area steel box girder swing-moving construction method comprises the following steps:
step 1: the cross-cable crane 1 walks to a first lifting position, and a lifting appliance is lowered to mount the lifting appliance on a steel box girder 4 positioned on a barge right below the cross-cable crane;
step 2: the cable-crossing crane 1 lifts the steel box girder 4 to a first swing height 17 of a first permanent sling 3, and installs the first permanent sling 3 on the lifting appliance, wherein the first swing height 17 is a position where a sling fork 15 of the first permanent sling 3 can be installed on the lifting appliance, and the first permanent sling 3 is a permanent sling for performing first swing;
step 3: the cable-crossing crane 1 gradually reduces the lifting appliance height, and the upper fixed end of the first permanent sling 3 is used as an origin to swing and move to a position where the first permanent sling 3 bears the weight of the steel box girder 4.
In the above embodiment, since the barge cannot transport the steel box girder to the lifting position in the shoal area or the shallow water riverbed, the present embodiment performs the swing construction on the steel box girder 4 by using the permanent hoist cable on the suspension bridge, and compared with the conventional scheme, the construction cost is reduced and the construction efficiency is increased.
First, the barge conveys the steel box girder 4 in the river channel to the position right below the lifting position of the cable crane 1, the selected general selected barge right below the lifting position of the cable crane 1 can travel to the nearest position where the steel box girder 4 is installed, the selected barge travels to the selected place, the cable crane 1 travels to the lifting position along the main cable 18 of the suspension bridge, the cable crane 1 lowers the crane, and the lifting appliance is installed on the steel box girder 4 on the barge, after the fixing, the cable crane 1 lifts the steel box girder 4, lifts the steel box girder 4 to the first swing height 17, and installs the first permanent lifting cable 3 with the lifting appliance.
The first swing height 17 may be any height from which the first permanent slings 3 can reach and be mounted to the spreader, among the heights from which the cross-cable crane 1 lifts the steel box girder 4.
After the first permanent sling 3 and the lifting appliance are installed, the steel stranded wires 2 of the cross-cable crane 1 are gradually released, the steel box girder 4 slowly descends along with the lifting appliance, the steel box girder 4 moves to the right lower end of the first permanent sling 3 along an arc path taking the first permanent sling 3 as a radius, and the first permanent sling 3 fully bears the whole weight of the steel box girder 4, so that the first swinging construction is completed.
Further, referring to fig. 1, another embodiment of the swing construction method of the steel box girder in the shallow water area of the present invention is shown, further comprising:
step 4, releasing a certain length of steel stranded wires 2 from the cable crane 1 or detaching the steel box girder 4 and the steel stranded wires 2 of the cable crane 1 from the steel box girder 4, wherein the releasing of the certain length of steel stranded wires 2 is to allow the steel stranded wires of the cable crane 1 to walk along a suspension bridge main cable 18 from a first hoisting position to a second hoisting position 19 under the condition that the steel stranded wires are fixed with a lifting appliance;
step 5: the cable-crossing crane 1 walks from a first hoisting position to a second hoisting position 19, wherein the second hoisting position 19 is a position on the main cable, where the cable-crossing crane 1 walks along the main cable 18 of the suspension bridge for the second swinging movement;
step 6: the cable-crossing crane 1 lifts the steel box girder 4 to a second swing height of a second permanent sling 13, and then installs the second permanent sling 13 on the sling and releases the first permanent sling 3, wherein the second swing height is a position where the cable-crossing crane 1 fully bears the weight of the steel box girder 4 and the sling fork lugs 15 of the second permanent sling 13 can be installed on the sling on the steel box girder 4, and the second permanent sling 13 is a permanent sling for carrying out second swing;
the method comprises the following steps: the cable-crossing crane 1 gradually reduces the height of the lifting appliance, the fixed end above the second permanent sling 13 is used as the origin to swing and move to the position where the second permanent sling 13 bears the weight of the steel box girder 4, when the steel box girder 4 reaches the preset position after the step 7, the swing and move construction is finished, and when the steel box girder 4 does not reach the preset position after the step 6, the steps 4 to 7 are continuously repeated.
In the above embodiment, after the first swing construction of the steel box girder 4 is completed, if the first swing construction is not completed, the second swing construction is performed, when the second swing construction is performed, the cable hoist 1 needs to be moved to the predetermined position first, when the cable hoist 1 moves, the steel stranded wires 2 with a certain length need to be released or the steel box girder 4 and the steel stranded wires 2 of the cable hoist 1 need to be detached from the steel box girder 4, so that the cable hoist 1 does not pull the steel box girder 4 when moving, the construction safety is ensured, the stability of the steel box girder 4 is ensured, then the cable hoist 1 moves to the second hoisting position 19 along the main cable 18 of the suspension bridge, and the second hoisting position 19 may be a position along the top of the main cable 18 of the suspension bridge at the top of the steel box girder 4 where the first swing construction is completed;
the second hoisting position 19 where the cable crane 1 runs can also be a position which is positioned at the top of the steel box girder 4 where the first swing construction is finished and continuously goes forward along the main cable 18 of the suspension bridge; it is also possible that the top end of the second permanent sling for the second swinging movement is located on the main cable or in a position further forward on the main cable.
After the steel box girder 4 is lifted by the cable crane 1 at the lifting position and the first swing construction is carried out, the steel box girder 4 is fully loaded by the first permanent sling 3, the cable crane 1 releases a certain length of steel stranded wires 2 or removes the steel box girder 4 and the steel stranded wires 2 of the cable crane 1 from the steel box girder 4, the cable crane 1 walks from a first lifting position 12 to a second lifting position 19 in the drawing, the second lifting position 19 can also be positioned at the top of the second permanent sling 13 in the drawing, the second lifting position 19 can be positioned at a front side or a rear side of the top of the second permanent sling 13 on the premise of meeting the safe construction of the cable crane 1 in the field construction, the cable crane 1 can firstly swing the steel box girder 4 upwards until the steel stranded wires 2 of the cable crane 1 are fully loaded with the steel box girder 4, the cable crane 4 is lifted to a second swing height, the second swing height is the weight of the whole steel box girder 4, and the second sling 13 can be mounted on the steel box girder 4. The cable-crossing crane 1 gradually reduces the lifting appliance height until the second permanent sling 13 fully bears the weight of the steel box girder 4, and the second swinging construction is completed.
In the above embodiment, as shown in fig. 1, if the second lifting position 19 where the cable-crossing crane 1 moves to can be any position before the position of the first permanent sling 3 after the first swing construction is completed, any position where the cable-crossing crane 1 can move to the left at the intersection point of the first permanent sling 3 and the main cable 18 of the suspension bridge is shown, and because the cable-crossing crane 1 is located at the front end of the steel box girder 4 in the horizontal direction, the cable-crossing crane 1 can firstly swing up the steel box girder 4 to a second swing height, so that one construction completes two steps, namely, swings forward for a distance and lifts the steel box girder 4 to the second swing height, thereby saving construction steps and improving construction efficiency.
When the steel box girder 4 is lifted by the cable crane 1, the included angle between the steel stranded wire 2 of the cable crane 1 and the main cable 18 of the suspension bridge cannot be larger than plus or minus thirty degrees, wherein the vertical direction of the main cable 18 of the suspension bridge is an initial angle, namely zero degree.
In summary, if the steel box girder 4 reaches the predetermined position after the second swing construction is completed, the construction is completed, and if the predetermined construction position is reached, the swing construction of the above embodiment needs to be continued until the steel box girder 4 reaches the target position, and the swing construction operation of the steel box girder 4 is completed.
Further, as shown in fig. 3, another embodiment of the swing construction method of the steel box girder in the shallow water area of the present invention is shown, and further includes:
step 3.1, after the first permanent sling 3 bears the weight of the steel box girder 4 completely, disassembling and assembling the end part of the steel strand 2 of the cross-cable crane 1 from the rear end of the first permanent sling 3 along the swinging direction of the steel box girder to the front end of the first permanent sling 3;
since the cross problem of the steel strand 2 and the second permanent slings 13 is considered when the second swing construction is performed, and the distance between each swing is increased for the sake of the construction efficiency by traveling the cable crane 1 forward for a longer distance and conforming to the safety angle of the hoisting of the cable crane 1, the end of the steel strand 2 of the cable crane 1 is disassembled from the rear end of the first permanent slings 3 along the swing direction of the steel box girder to the front end of the first permanent slings 3 after each swing construction of the cable crane 1, thereby reducing the number of swings.
Further, as shown in fig. 1, another embodiment of the swing construction method of the steel box girder in the shallow water area of the present invention is shown, and further includes:
step 4: the cable-crossing crane 1 walks to a position right above the first permanent sling 3, and lifts the steel box girder 4 to a second swing height of the second permanent sling 13, and the second permanent sling 13 is installed after the first permanent sling 3 is released;
step 5: the cable-crossing crane 1 gradually reduces the lifting appliance height until the second permanent sling 13 fully bears the weight of the steel box girder 4, the swinging construction is finished when the steel box girder 4 reaches a preset position after the step 5, and the cable-crossing crane 1 walks to a position right above the second permanent sling 13 and repeats the steps from the step 4 to the step 5 if the steel box girder 4 does not reach the preset position after the step 5.
In the above embodiment, each time of swinging construction, the cable crane 1 is located at the top of the steel box girder 4 after the previous step of swinging construction is completed, each time of construction of the cable crane 1 lifts the steel box girder 4 to the swinging height of the permanent sling of the next swinging construction, and the above operation is repeated to complete the whole swinging construction. In this embodiment, the connection between the cable crane 1 and the lifting appliance does not need to be released every time of swinging operation, and only the next permanent lifting cable is required to be detached and installed, in this embodiment, the cable crane 1 is equivalent to vertical lifting every time, and the operation is simple and convenient, and the construction is safe.
Further, as shown in fig. 1 or fig. 4, another embodiment of the shallow water area steel box girder swing construction method of the present invention is shown, further comprising:
step 8: connecting a winch 16 on a tower column with a steel box girder 4 of a non-cable area through a pulley 20 group, and after the steel box girder 4 of the non-cable area reaches a preset position, gradually winding ropes through the winch 16 on the tower column, gradually releasing steel strands 2 across a cable crane 1, and moving the steel box girder 4 of the non-cable area to a specified position;
step 9, the cross-cable crane 1 swings the steel box girders 4 with the permanent slings to a preset position one by one, and adjusts the steel box girders 4 to an assembling position for fixed assembly.
In the above embodiment, when the steel box girder 4 in the lasso zone is installed temporarily, because the upper end of the steel box girder 4 in the lasso zone has no permanent sling, an auxiliary tool is needed to construct the steel box girder 4 in the lasso zone, and considering that the lasso zone is closer to the permanent sling, the winch 16 is matched with the cable-crossing crane 1, when the steel box girder 4 is subjected to the final swinging construction and is positioned on the edge of the lasso zone, the winch 16 on the tower column is connected with the steel box girder 4 through the pulley 17 group to temporarily pull the lug plate, the cable is gradually retracted through the winch 16 on the tower column, and the cable-crossing crane 1 gradually releases the steel strands 2 to move the lasso zone steel box girder 4 to the designated position, so that the construction in the lasso zone is completed.
Referring to fig. 2, a block diagram of a lifting appliance according to an embodiment of the present invention is shown, where the lifting appliance includes:
a spandrel girder 10;
a sector plate 7, wherein at least two connecting holes 11 are formed at one arc end of the sector plate 7;
the sling fork ear conversion head is used for detachably connecting one end of the sling fork ear conversion head with the sling fork ear 15, and the other end of the sling fork ear conversion head is in pin joint with the connecting hole 11;
the steel strand conversion head 6 is used for detachably connecting one end of the steel strand conversion head 6 with the steel strand 2, and the other end of the steel strand conversion head is in pin joint with the connecting hole 11;
one end of the circle center of the sector plate 7 is rotationally connected with the spandrel girder 10.
In the above embodiment, the sling fork ear conversion head and the steel strand conversion head 6 are respectively pinned on the connecting hole 11 at one circular arc end of the sector plate 7, the sector plate 7 is used as a rotating connecting piece, the sling fork ear conversion head and the steel strand conversion head 6 are connected with the spandrel girder 10, wherein when the spandrel girder 10 bears a weight, the connecting hole 11 of any one of the sector plates 7 for transmitting the load and the rotating connecting part of the sector plate 7 and the spandrel girder 10 are positioned on the gravity center line of the weight.
Due to the arrangement of the sector plates 7 which are rotationally connected with the spandrel girder 10, the lifting appliance of the embodiment can keep the steel box girder 4 stable all the time when lifting and swinging the steel box girder 4, and ensures the construction to be carried out stably and safely.
Further, as shown in fig. 2, another embodiment of a lifting appliance of the present invention is shown, further comprising:
the sling fork ear conversion head consists of a sling fork ear connecting plate 9 and a first connecting plate 5, and the sling fork ear connecting plate 9 is detachably and rotatably connected with the sector plate 7 through the first connecting plate 5 and the connecting hole 11.
In the above-mentioned embodiment, the hoist cable fork ear conversion head comprises hoist cable fork ear connecting plate 9 and first connecting plate 5, hoist cable fork ear connecting plate 9 is used for connecting hoist cable fork ear, first connecting plate 5 is used for reducing hoist cable fork ear connecting plate and the minimum contained angle of steel strand wires conversion head, first connecting plate 5 is connected hoist cable fork ear connecting plate 9 and sector plate 7 as the extension board, prevent because hoist cable fork ear connecting plate 9 that the width is great conflicts each other with steel strand wires conversion head 6, through the mode of extension hoist cable fork ear connecting plate 9, the produced contained angle is reduced when making hoist cable fork ear connecting plate 9 and steel strand wires conversion head 6 subsides, first connecting plate 5 can effectually reduce hoist cable fork ear connecting plate 9 and sector plate 7's size, avoid hoist cable fork ear connecting plate 9 and hoist cable fork ear conversion head conflict in the space, can satisfy the big angle of within 24 degrees and swing and move the construction.
Further, as shown in fig. 2, another embodiment of a lifting appliance of the present invention is shown, further comprising:
the first connecting plate 5 is in a narrow and long plate shape, grooves are formed in two ends of the first connecting plate 5, the side face of the first connecting plate 5 is in an I-shaped structure, and through holes for rotationally connecting the sling fork lug connecting plate and the sector plates are formed in two ends of the first connecting plate 5 respectively.
The tips of the three corners of the triangle plate shape of the sling fork lug connecting plate 9 are arc-shaped;
in the above embodiment, the first connecting plate 5 is used as an extension piece, and needs to be narrower and better under the condition of meeting the necessary bearing, and needs to be used for connecting the sling fork ear connecting plate and the sector plate, so the first connecting plate 5 is of an "I" structure, and the openings on two sides of the I shape are used for clamping the sling fork ear connecting plate and the sector plate, so that the connection stability of the sling fork ear connecting plate and the sector plate during swinging construction can be ensured.
Preferably, the tips of the three corners of the triangle-shaped plate shape of the sling fork ear connecting plate 9 are arc-shaped, which can prevent damage to the steel strand 2 or constructors due to the sharp tips.
Further, as shown in fig. 2, another embodiment of a lifting appliance of the present invention is shown, further comprising:
the connection part of the sling fork ear connecting plate 9 is provided with a pin hole and a pin shaft 14, and the pin shaft 14 and the pin hole are arranged at the connection part of the sling fork ear connecting plate 9 and the sling fork ear 15;
the pin holes are in clearance fit with the pin shafts 14;
in the above embodiment, the connecting part of the sling fork ear connecting plate 9 is provided with the pin hole and the pin shaft 14, and the convenience of disassembly and assembly during construction can be simplified through the pin shaft connection.
Preferably, the pin hole and the pin shaft 14 are in clearance fit, and the preferable clearance of the clearance fit is 0.2mm, and the clearance can be 0.1mm-0.3mm.
Further, as shown in fig. 2, another embodiment of a lifting appliance of the present invention is shown, further comprising:
the length direction of the sector plate 7 is the same as the length direction of the spandrel girder 10, and one end of the center of a circle of the sector plate 7 is rotationally connected with the spandrel girder 10 along the length direction of the spandrel girder.
In the above embodiment, the length directions of the sector plate 7 and the spandrel girder 10 are the same, so that when the lifting appliance carries the steel box girder 4, the rotation of the sector plate 7 can not lead the steel box girder 4 to swing left and right, and the length directions of the sector plate 7 and the spandrel girder 10 are the same, so that the steel box girder 4 is always in a stable horizontal direction, and the construction is safer and more stable.
Further, as shown in fig. 2, another embodiment of a lifting appliance of the present invention is shown, further comprising:
the two ends of the steel strand conversion head 6 or the sling fork ear connecting plate 9 are anchor heads;
in the above embodiment, the steel strand conversion head 6 or the sling fork ear connecting plate 9 is in the shape of an anchor head, and the anchor head has very wide application in the whole industry, and has a stable structure and is firm and durable.
Further, as shown in fig. 2, another embodiment of a lifting appliance of the present invention is shown, further comprising:
the detachable connection of the sling fork lug conversion head and the sling fork lug 15 from the permanent sling is detachable fixed connection or detachable rotary connection;
the steel strand conversion head 6 is detachably fixedly connected or detachably rotatably connected with the end part from the steel strand 2;
in the above embodiment, the connection parts of the sling fork ear conversion head and the steel strand conversion head 6 are detachably connected, so that the connection is firm;
preferably, the connection part of the sling fork lug conversion head and the steel strand conversion head 6 is detachably connected in a rotating way, so that the sling fork lug conversion head and the steel strand conversion head 6 always bear linear tension when being stressed when the steel box girder 4 is swung and moved, and the permanent sling and the steel strand 2 are not easy to break, thereby avoiding accidents.
Further, as shown in fig. 2, another embodiment of a lifting appliance of the present invention is shown, further comprising:
when the spandrel girder 10 is used for bearing a weight, the connection point of any connecting hole 11 of the sector plate 7 for transmitting the load and the rotating connection point of the sector plate 7 and the spandrel girder 10 is positioned on the gravity center line of the weight.
In the above embodiment, the fan-shaped plate 7 is flexibly rotated on the spandrel girder 10 when one end of the center of circle of the fan-shaped plate 7 is connected with the spandrel girder 10 due to its shape advantage, in this embodiment, in order to ensure construction safety, when the spandrel girder 10 is carrying a heavy object, any one of the connecting holes 11 of the fan-shaped plate 7 for transmitting load is located on the gravity center line of the heavy object at the rotational connection position of the fan-shaped plate 7 and the spandrel girder 10.
Further, as shown in fig. 2, another embodiment of a lifting appliance of the present invention is shown, further comprising:
a second connecting plate 8 is arranged between the spandrel girder 10 and the sector plate 7, and the spandrel girder 10 is rotationally connected with the sector plate 7 through the second connecting plate 8;
the bearing beam 10 and the sector plate 7 are provided with a sliding seat 21 and a sliding rail, the sliding rail is arranged on the bearing beam 10 along the length direction of the bearing beam, the sliding seat 21 is in sliding connection with the sliding rail, the bearing beam 10 is in rotary connection with the sector plate 7 through the sliding seat 21, and a stop part for limiting the sliding seat 21 and the sliding rail to slide mutually is arranged on the sliding seat 21.
In the embodiment, the spandrel girder 10 and the sector plate 7 are rotationally connected through the second connecting plate 8, so that the steel box girder 4 can adjust the gravity center of the spandrel girder 10 to be stable through dead weight when bearing the steel box girder 4;
the slide seat 21 and the slide rail between the spandrel girder 10 and the sector plate 7 enable the sector plate 7 to move along the length direction of the spandrel girder 10, constructors can adjust the horizontal stability of the steel box girder 4 borne by the spandrel girder 10 by adjusting the position between the sector plate 7 and the spandrel girder 10, and the stop part is used for fixing the relative position between the slide seat 21 and the slide rail, so that the relative position between the sector plate 7 and the spandrel girder 10 is fixed, and stable construction is performed.
Referring to fig. 1 or fig. 5, a process diagram of a shallow water area steel box girder swing construction system according to an embodiment of the present invention is shown, where the shallow water area steel box girder swing construction system includes:
a cable-crossing crane 1;
a main cable of the suspension bridge is provided with a cross-cable crane 1;
a first permanent sling secured to the suspension bridge main cable;
the use of the cross-cable crane 1 of one of the spreaders of claim 7, the cross-cable crane 1, the suspension bridge main cable and the first permanent sling for a shallow water section steel box girder swing construction method of claim 1.
In the above embodiment, by integrating existing resources of the suspension bridge, under the condition of saving resources, the steel box girder 4 is swung to the construction position, the barge conveys the steel box girder 4 to the position right below the lifting position of the cable hoist 1 in the river channel, the selected barge right below the lifting position of the cable hoist 1 can travel closest to the position where the steel box girder 4 is installed, the selected barge travels to the selected place, the cable hoist 1 travels to the lifting position along the suspension bridge main cable 18, the cable hoist 1 lowers the hoist, the hoist is mounted on the steel box girder 4 on the barge, the cable hoist 1 lifts the steel box girder 4 after fixing, the steel box girder 4 is lifted to the first swing height 17, and the first permanent sling 3 is mounted with the hoist. After the first permanent sling 3 and the lifting appliance are installed, the steel stranded wires 2 of the cross-cable crane 1 are gradually released, the steel box girder 4 slowly descends along with the lifting appliance, the steel box girder 4 moves to the right lower end of the first permanent sling 3 along an arc path taking the first permanent sling 3 as a radius, and the first permanent sling 3 fully bears the whole weight of the steel box girder 4, so that swinging construction is completed.
It should be noted that all the directional indications (such as up, down, left, right, front, and rear … …) in this embodiment are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly.
Furthermore, the description of "first," "second," etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
The technical solutions between the embodiments may be combined with each other, but it is necessary to base the implementation on the basis of those skilled in the art that when the combination of technical solutions contradicts or cannot be implemented, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.
Claims (5)
1. A shallow water area steel box girder swinging construction method comprises the following steps:
step 1: the cross-cable crane walks to a first hoisting position, and a lifting appliance is lowered to mount the lifting appliance on a steel box girder on a barge right below the cross-cable crane;
step 2: the cable-crossing crane lifts the steel box girder to a first swing height of a first permanent sling, and installs the first permanent sling on the lifting appliance, wherein the first swing height is a position where a sling fork lug of the first permanent sling can be installed on the lifting appliance, and the first permanent sling is a permanent sling for carrying out first swing;
step 3: gradually reducing the lifting appliance height of the cable-crossing crane, and swinging the first permanent lifting cable to a position where the first permanent lifting cable bears the weight of the steel box girder by taking the fixed end above the first permanent lifting cable as an origin;
step 4, releasing a certain length of steel stranded wire from the cable crane or detaching the steel box girder and the steel stranded wire of the cable crane from the steel box girder, wherein the releasing of the certain length of steel stranded wire is to allow the steel stranded wire of the cable crane to travel from a first hoisting position to a second hoisting position along a main cable of the suspension bridge under the condition that the steel stranded wire of the cable crane is fixed with a lifting appliance;
step 5: the cable-crossing crane walks from a first hoisting position to a second hoisting position, wherein the second hoisting position is a position on the main cable, which is walked by the cable-crossing crane along the main cable of the suspension bridge and is subjected to second swinging;
step 6: the cable-crossing crane lifts the steel box girder to a second swing height of a second permanent sling, and then installs the second permanent sling on the sling and releases the first permanent sling, wherein the second swing height is a position where the cable-crossing crane fully bears the weight of the steel box girder and sling fork lugs of the second permanent sling can be installed on the sling on the steel box girder, and the second permanent sling is a permanent sling for carrying out second swing;
step 7: and (3) gradually lowering the height of the lifting appliance by the cable-crossing crane, swinging and moving the fixed end above the second permanent lifting rope to the position where the second permanent lifting rope fully bears the weight of the steel box girder by taking the fixed end as an origin, finishing swinging and moving construction when the steel box girder reaches a preset position after the step (7), and continuously repeating the steps (4) to (7) if the steel box girder does not reach the preset position after the step (6).
2. The method for swing construction of steel box girders in shallow water according to claim 1, further comprising, between the step 3 and the step 4:
and 3.1, after the first permanent sling bears the weight of the steel box girder, disassembling and assembling the end part of the steel strand of the cable-crossing crane from the rear end of the first permanent sling along the swinging direction of the steel box girder to the front end of the first permanent sling.
3. The shallow water area steel box girder swing construction method as claimed in claim 1, further comprising:
step 4: the cable-crossing crane walks to a position right above the first permanent sling, and lifts the steel box girder to a second swing height of the second permanent sling, and the second permanent sling is installed after the first permanent sling is released;
step 5: and (3) gradually lowering the lifting appliance height of the cable-crossing crane until the second permanent sling fully bears the weight of the steel box girder, finishing swinging construction when the steel box girder reaches a preset position after the step (5), and walking the cable-crossing crane to a position right above the second permanent sling and repeating the steps from the step (4) to the step (5) if the steel box girder does not reach the preset position after the step (5).
4. The shallow water area steel box girder swing construction method as claimed in claim 1, further comprising:
step 8: connecting a winch on a tower column with a steel box girder of a non-cable area through a pulley block, and after the steel box girder of the non-cable area reaches a preset position, gradually winding ropes through the winch on the tower column, gradually releasing steel strands through a cable-crossing crane, and moving the steel box girder of the non-cable area to a specified position;
and 9, the cross-cable crane swings the steel box girders with the permanent slings to a preset position one by one, and adjusts the steel box girders to an assembly position for fixed assembly.
5. A shallow water district steel case roof beam is swayd and is moved construction system, characterized by includes:
a cable-crossing crane;
a main cable of the suspension bridge is provided with a cable-crossing crane;
a first permanent sling secured to the suspension bridge main cable;
the suspension bridge main cable and the first permanent sling are used for the shallow water area steel box girder swinging construction method in the invention of claim 1;
the hoist that strides cable loop wheel machine and use includes:
a spandrel girder;
a sector plate, wherein at least two connecting holes are formed at one arc end of the sector plate;
the sling fork ear conversion head is used for being detachably connected with the sling fork ear at one end and connected with the Kong Xiaojie at the other end;
the steel strand conversion head is used for being detachably connected with the steel strand at one end and the other end of the steel strand conversion head is connected with the connection Kong Xiaojie;
one end of the circle center of the sector plate is rotationally connected with the spandrel girder;
the sling fork lug conversion head consists of a sling fork lug connecting plate and a first connecting plate, and the sling fork lug connecting plate is detachably and rotatably connected with the sector plate through the first connecting plate and the connecting hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910068973.1A CN109761137B (en) | 2019-01-24 | 2019-01-24 | Shallow water area steel box girder swinging construction method and system and lifting appliance |
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| CN201910068973.1A CN109761137B (en) | 2019-01-24 | 2019-01-24 | Shallow water area steel box girder swinging construction method and system and lifting appliance |
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| CN109761137B true CN109761137B (en) | 2023-10-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110616638A (en) * | 2019-09-11 | 2019-12-27 | 保利长大工程有限公司 | Bracket-free hoisting method for steel box girder in shallow beach area of suspension bridge |
| CN113445428B (en) * | 2021-07-15 | 2023-05-09 | 中交一公局集团有限公司 | Transfer device and construction method for continuous movement of large components in the air |
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| CN206052568U (en) * | 2016-09-19 | 2017-03-29 | 中交一公局第三工程有限公司 | The long hoist cable of suspension bridge bank slope beam section swings shifting erecting device |
| CN107119567A (en) * | 2017-04-28 | 2017-09-01 | 武汉智汇高桥科技股份有限公司 | Suspension bridge steel box-girder deck erection gantry and spreading hoist cable swing shifting construction method |
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| GB1201038A (en) * | 1966-10-22 | 1970-08-05 | Coast Lines Ltd | Improvements in and relating to a spreader frame for a lifting device |
| CN101103142A (en) * | 2004-12-21 | 2008-01-09 | E.C.L.公司 | Device for assembling and disassembling cover of electrolytic aluminum cell |
| CN1710208A (en) * | 2005-07-03 | 2005-12-21 | 路桥集团第二公路工程局 | Swing-construction method for mounting dual-hoist at land-shoul beam section for steel box girder suspension bridge |
| CN106320182A (en) * | 2016-09-19 | 2017-01-11 | 中交公局第三工程有限公司 | Suspension bridge bank slope beam section long sling swing-shifting mounting device and method |
| CN206052568U (en) * | 2016-09-19 | 2017-03-29 | 中交一公局第三工程有限公司 | The long hoist cable of suspension bridge bank slope beam section swings shifting erecting device |
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