CN111335191B - Construction method for dismantling overpass bridge on expressway - Google Patents
Construction method for dismantling overpass bridge on expressway Download PDFInfo
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- CN111335191B CN111335191B CN202010177385.4A CN202010177385A CN111335191B CN 111335191 B CN111335191 B CN 111335191B CN 202010177385 A CN202010177385 A CN 202010177385A CN 111335191 B CN111335191 B CN 111335191B
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- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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Abstract
The invention discloses a construction method for dismantling a overpass bridge on a highway, which relates to the technical field of the dismantling of the overpass bridge and solves the problems that the existing overpass bridge is easy to damage the bottom of the overpass bridge when being cut and the generated fragments are not easy to clean and transport, and the technical scheme is characterized by comprising the following steps: a. measuring and scribing; b. punching; c. the positioning column and the positioning plate are arranged; d. treating a foundation; e. erecting a scaffold under the high-speed bridge; f. erecting a scaffold on the high-speed bridge; g. erecting scaffolds on two sides of the high-speed bridge; h. dismantling the guard rail and the flange plate; i. hoisting the flange plate; j. cutting and hoisting the concrete block; k. demolish the scaffold frame, the reference column fixes a position the concrete piece that cuts off and makes it be difficult to fall to the expressway of bottom on, and the hoist is connected to the reference column top and hoists the concrete piece when shifting, and the concrete piece shape is more regular and shift convenient and fast.
Description
Technical Field
The invention relates to the technical field of removal of overpasses, in particular to a construction method for removing an overpass on a highway.
Background
With the development of social economy, the service level of the expressway with traffic built in the past ninety years is obviously lagged behind the current economic development, in order to improve the traffic capacity and better serve the economic development of surrounding areas, many expressways are subjected to reconstruction and expansion, and in the process of reconstructing and expanding the expressway, the situation that a overpass bridge is removed to meet the reconstruction and expansion requirements is often encountered.
Among the overpasses, there is a special type of overpass, which is located in urban areas and spans a high-speed bridge; when the overpass bridge is demolishd, the mode that adopts mechanical demolishs mostly demolishs, when demolishs, set up bailey support and protection bamboo basketry, net etc. in bridge regulation position in advance, when demolishs, earlier with hydraulic pressure shear bridge both sides pterygoid lamina, cantilever structure, reuse rock drill is at box girder body opening, and contact stress is restrainted, then use long-armed hydraulic pressure shear to join in marriage back rock drill and demolish from the opening part to both sides, the concrete fragment that adopts this kind of demolishs mode to demolish drops easily and causes the damage to the high-speed bridge on the high-speed bridge of bottom, and the concrete fragment that breaks and produces because the structure is irregular and not of uniform size, there is the problem that the concrete fragment shifts the difficulty.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a construction method for dismantling a overpass bridge on an expressway, wherein a positioning column positions a cut concrete block so that the concrete block is not easy to fall on the expressway at the bottom, a crane is connected to the top of the positioning column during transfer to hoist the concrete block, and the concrete block is more regular in shape and convenient and quick to transfer.
In order to achieve the purpose, the invention provides the following technical scheme: a construction method for dismantling a overpass bridge on a highway comprises the following steps:
a. measuring and scribing: measuring the top of a to-be-removed overpass, calculating the size of each rectangular concrete block after cutting according to the width of the overpass after removing a flange plate and the length to be removed, then marking the position and the shape of each concrete block at the top of the overpass in a marking mode, calculating the size of the rectangular concrete block cut by the flange plate according to the size of the flange plate, marking the top of the flange plate to mark the position and the shape of the concrete block to be cut by the flange plate, then marking four positions to be punched at the top of each concrete block, wherein the four holes are respectively positioned at the positions close to four corners of the top of the concrete block;
b. punching: punching the punched position marked at the top of the concrete block, wherein the hole is vertically formed and completely penetrates through the overpass;
c. and (3) installing a positioning column and a positioning plate: selecting a positioning plate with the size smaller than the size of the top of the concrete block, inserting four positioning columns at the top of the positioning plate into four holes formed in the concrete block, then connecting a pre-fixing nut on the positioning columns in a threaded manner, and rotating the pre-fixing nut to enable the pre-fixing nut to be in contact with the top surface of the overpass;
d. foundation treatment: excavating soft soil in the abutting range under the high-speed bridge, then backfilling by using limestone, and compacting the limestone after backfilling;
e. erecting a scaffold under a high-speed bridge: building a landing scaffold under the high-speed bridge, wherein one end of the bottom of the bottommost vertical scaffold is driven into a foundation, and one end of the top of the topmost vertical scaffold is fixed at the bottom of the high-speed bridge;
f. erecting a scaffold on the high-speed bridge: the method comprises the following steps of constructing scaffolds at the top of the high-speed bridge, wherein one end of the bottom of the bottommost vertical scaffold is abutted against the top of the high-speed bridge, the top of the topmost vertical scaffold is abutted against the bottom of a positioning plate, the position, close to four corners, of the bottom of each positioning plate is respectively abutted against one vertical scaffold except the positioning plate at the bottom of a flange plate, four limiting pipes are fixedly connected to the positions, close to the four corners, of the bottom of each positioning plate, and one ends of the tops of the four vertical scaffolds at the bottoms of the positioning plates are respectively inserted into the four limiting pipes;
g. erecting scaffolds on two sides of the high-speed bridge: erecting scaffolds on two sides of the high-speed bridge, driving the bottom of the bottommost vertical scaffold into the foundation, and tightly abutting one end of the top of the topmost vertical scaffold against the top of the overpass bridge;
h. removing the guardrail and the flange plate: firstly, connecting hoisting ropes at the tops of positioning columns corresponding to a concrete block to be cut, connecting the hoisting ropes on the four positioning columns corresponding to the concrete block to a lifting hook of the same crane, so that the hoisting ropes are in a tightened state, then cutting the concrete block, unloading the cut concrete block, and then cutting the next concrete block until the flange plate is completely cut;
i. hoisting the flange plate: hoisting the cut flange plate to a turnover mechanism of a transport vehicle, detaching a hoisting rope from a positioning column, then overturning a positioning plate to a vertical position by the turnover mechanism, and pushing a concrete block into a hopper of the transport vehicle through a discharging hydraulic cylinder;
j. cutting and hoisting concrete blocks: after hoisting of the flange plate is finished, cutting and cutting are carried out according to a lineation overpass at the top of the overpass, before concrete blocks are cut, hoisting ropes on four positioning columns corresponding to the concrete blocks are connected to lifting hooks of the same crane, so that the hoisting ropes are in a tightened state, then the concrete blocks are cut, the cut flange plate is hoisted to a turnover mechanism of a transport vehicle, the hoisting ropes are detached from the positioning columns, then the positioning plate is turned to a vertical position by the turnover mechanism, and the concrete blocks are pushed to a hopper of the transport vehicle through a discharging hydraulic cylinder; when in cutting, symmetrical cutting is carried out from two sides of the overpass bridge;
k. dismantling the scaffold: and (5) dismantling the scaffold.
Through adopting above-mentioned technical scheme, the mode through the cutting makes the concrete piece size of production even and can not produce the rubble piece to fix a position and support the concrete piece through reference column and locating plate, thereby make the problem that the concrete piece dropped on the high-speed bridge of difficult production in the middle of the process of cutting and hoist and mount, thereby be difficult to cause the damage to the high-speed bridge, and the concrete piece shape size that the cutting produced is more regular, makes the transportation more convenient.
The invention is further configured to: and d, backfilling the limestone by adopting a layered backfilling mode when the limestone is backfilled, controlling the thickness of each backfilling to be 30cm, compacting after each layer of backfilling is finished, backfilling the next layer after the layers are completely compacted, and compacting the backfilled part again by using a road roller after all layers are backfilled.
Through adopting above-mentioned technical scheme, carry out the limestone backfill through the mode of layering backfill to every layer is backfilled and is all carried out the compaction, can guarantee that the limestone after backfilling is more closely knit, improves the support stability of ground.
The invention is further configured to: and d, after backfilling is finished, pouring concrete into the foundation, paving a layer of concrete on the top of the foundation, troweling the top of the concrete layer, covering geotextile on the concrete layer and performing watering maintenance after the concrete layer is paved, wherein the maintenance time is not shorter than seven days.
Through adopting above-mentioned technical scheme, through pouring the concrete and carrying out the maintenance to the concrete after pouring in to the ground, the closely knit degree of improvement ground that can be great to improve the support stability of ground.
The invention is further configured to: and e, the built scaffold belongs to a full hall frame, and the scaffold is guaranteed to be supported at the bottom of each I-shaped beam of the high-speed bridge.
Through adopting above-mentioned technical scheme, support the scaffold frame on the I-beam, what can stabilize more supports high-speed bridge.
The invention is further configured to: the end of four hoisting ropes connected with the four positioning columns on the same positioning plate, which deviates from the positioning columns, is connected to a hoisting disc together, the lengths of the four hoisting ropes are equal, and the top of the hoisting disc is fixedly connected with a hoisting ring.
Through adopting above-mentioned technical scheme, through setting up the hoist and mount dish, can be easier fix four hoist and mount ropes on the couple of hoist to can control the length unanimity of four hoist and mount ropes, can be more steady when guaranteeing to lift by crane the concrete piece.
The invention is further configured to: the top one end of reference column is seted up with the coaxial connecting hole of reference column, and the one end fixedly connected with that the hoist and mount rope deviates from the hoist and mount dish is equal with the connecting hole diameter spliced pole, and the spliced pole can insert in the middle of the connecting hole and be in the same place with reference column threaded connection.
Through adopting above-mentioned technical scheme, when connecting the hoist and mount rope, only need with the spliced pole screw up on the reference column that corresponds can for connect convenient and fast more.
The invention is further configured to: the turnover mechanism comprises a rotating shaft, two supporting plates, two baffle plates, a limiting plate and a discharging hydraulic cylinder, wherein the rotating shaft is rotatably connected to the bottom of one end, away from the vehicle head, of the vehicle hopper;
the axis direction level of axis of rotation sets up and is parallel to each other with the width direction of car hopper bottom, and the length direction of two backup pads is parallel to each other and the length direction of backup pad and the axis direction mutually perpendicular of axis of rotation, and when the backup pad was in horizontal position, the baffle was located the backup pad top, and two logical grooves have been seted up to the locating plate both sides, and the limiting plate can insert logical inslot.
Through adopting above-mentioned technical scheme, two backup pads rotate earlier to horizontal position, place concrete piece and locating plate together at the backup pad top in hoist and mount, the hoist and mount rope is dismantled down from the reference column, then the backup pad rotates towards vertical position, in the middle of the pivoted process, the locating plate slides towards the direction that is close to the axis of rotation, make the limiting plate insert logical in the middle of the gliding process, when the backup pad rotates to vertical position, the piston rod of the pneumatic cylinder of unloading promotes the concrete piece and slides towards the direction that deviates from the locating plate, until the concrete piece breaks away from completely with the reference column, realize the loading of concrete piece.
The invention is further configured to: the distance between one side of the limiting plate close to the supporting plate and one side of the supporting plate close to the limiting plate is equal to the distance between the bottom of the through groove and the bottom of the positioning plate.
Through adopting above-mentioned technical scheme, through injecing the position of limiting plate and logical groove for the limiting plate can be easier insert logical groove in the middle of.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the produced concrete blocks are uniform in size and can not produce broken stone blocks in a cutting mode, and the concrete blocks are positioned and supported by the positioning columns and the positioning plates, so that the problem that the concrete blocks fall onto a high-speed bridge is not easy to generate in the cutting and hoisting processes, the high-speed bridge is not easy to be damaged, and the cut concrete blocks are more regular in shape and size, so that the transportation is more convenient;
2. according to the invention, the four hoisting ropes can be more easily fixed on the hook of the crane by arranging the hoisting disc, and the lengths of the four hoisting ropes can be controlled to be consistent, so that the concrete block can be more stably hoisted.
Drawings
FIG. 1 is a schematic view of the overall structure of the first embodiment;
FIG. 2 is a schematic view of an embodiment of a position limiting tube;
FIG. 3 is an enlarged view of portion A of FIG. 1;
FIG. 4 is a schematic view of the second embodiment in use;
FIG. 5 is an enlarged view of the portion B of FIG. 4;
FIG. 6 is a schematic view of an embodiment two performance limiting plates;
fig. 7 is an enlarged schematic view of the portion C of fig. 5.
In the figure: 1. positioning a plate; 11. a hole of abdication; 12. a through groove; 13. a limiting pipe; 2. a positioning column; 21. pre-positioning the nut; 22. connecting holes; 3. hoisting a disc; 31. a hoisting ring; 32. hoisting a rope; 33. connecting columns; 4. a turnover mechanism; 41. a rotating shaft; 411. a fixed block; 42. a support plate; 43. a baffle plate; 44. a stripper plate; 441. a connecting plate; 45. a discharging hydraulic cylinder; 46. a power assembly; 461. a base plate; 462. a power hydraulic cylinder; 463. a fixing plate; 464. a rotating shaft; 465. a fixed shaft; 47. and a limiting plate.
Detailed Description
The first embodiment is as follows: a concrete block hoisting device is shown in attached figures 1 and 2 and comprises a positioning plate 1, four positioning columns 2 fixedly connected to the top of the positioning plate 1, four pre-positioning nuts 21 respectively in threaded connection with the four positioning columns 2, a hoisting disc 3 arranged above the positioning plate 1, a hoisting ring 31 fixedly connected to the top of the hoisting disc 3, four hoisting ropes 32 fixedly connected to the bottom of the hoisting disc 3, a connecting column 33 fixedly connected to one end, away from the hoisting disc 3, of the hoisting rope 32 and four limiting pipes 13 fixedly connected to the bottom of the positioning plate 1; the positioning plate 1 is arranged in a rectangular shape, and the four positioning columns 2 are respectively positioned at the positions, close to four corners, of the top of the positioning plate 1; the axis direction of the positioning column 2 is vertically arranged; four spacing pipes 13 are located the position that is close to the four corners in locating plate 1 bottom respectively, and spacing pipe 13's axis direction vertical setting. The middle position of the top of the positioning plate 1 is provided with a yielding hole 11 which runs through the positioning plate 1 along the vertical direction. Four hoisting ropes 32 are respectively positioned at the positions of the four positioning columns 2 at the bottom of the hoisting disc 3. Two through grooves 12 are formed in two sides of the positioning plate 1, and the through grooves 12 penetrate through the positioning plate 1 along the length direction of two side edges of the positioning plate 1.
Referring to fig. 3, a connecting hole 22 coaxial with the positioning column 2 is formed in one end of the top of the positioning column 2, an internal thread is formed in the hole wall of the connecting hole 22, the diameter of the connecting column 33 is equal to that of the connecting hole 22, and an external thread matched with the internal thread is formed in the outer side of the connecting column 33.
The working principle of the concrete block hoisting equipment when in use is as follows: after the line marking on the overpass bridge is finished and the punching is finished, four positioning columns 2 at the top of the positioning plate 1 are respectively inserted into four holes of the concrete block, then pre-positioning nuts 21 are connected to the top of the positioning columns 2, and the pre-positioning nuts 21 are screwed down, so that the pre-positioning nuts 21 are in contact with the top of the overpass bridge. When the scaffold on the high-speed bridge is built, a vertical scaffold is inserted into each positioning pipe; when cutting the concrete piece, screw up four spliced poles 33 respectively at the top of four reference columns 2, then on hanging ring 31 with the couple hook of hoist, it is taut to hoist rope 32, then carries out the concrete piece cutting, after the cutting is accomplished, carries out the hoist and mount of concrete piece.
Example two: a concrete block unloading device, refer to fig. 4 and 5, including a turnover mechanism 4 arranged on one side of a car hopper far away from a car head, wherein the turnover mechanism 4 includes a rotating shaft 41 rotatably connected to the bottom of one end of the car hopper far away from the car head, two supporting plates 42 fixedly connected to the rotating shaft 41, two baffles 43 fixedly connected to the sides of the two supporting plates 42 close to each other, an unloading plate 44 fixedly connected to the rotating shaft 41 and positioned between the two supporting plates 42, and an unloading hydraulic cylinder 45 fixedly connected to the unloading plate 44; two fixed blocks 411 fixedly connected to the car hopper are arranged at two ends of the rotating shaft 41, and two ends of the rotating shaft 41 are respectively and rotatably connected to the two fixed blocks 411.
Referring to fig. 5 and 6, the axial direction of the rotating shaft 41 is horizontally arranged and parallel to the width direction of the bottom of the hopper, the length directions of the two support plates 42 are parallel to each other and the length direction of the support plate 42 is perpendicular to the axial direction of the rotating shaft 41, when the support plates 42 are in the horizontal position, the baffle 43 is positioned at the top of the support plates 42, the length direction of the baffle 43 is parallel to the length direction of the support plates 42, two limit plates 47 are fixedly connected to the sides of the two baffle plates 43 close to each other, and the length direction of the limit plates 47 is parallel to the length direction of the support plates 42; the distance between one end of the support plate 42, which is far away from the rotating shaft 41, and the rotating shaft 41 is greater than the distance between one end of the limiting plate 47, which is far away from the rotating shaft 41, and the distance difference is greater than or equal to the distance between two sides of the positioning plate 1, which are not provided with the through groove 12; the distance between the two baffle plates 43 is equal to the distance between two sides of the positioning plate 1 with the through groove 12. The distance between the side of the limit plate 47 close to the support plate 42 and the side of the support plate 42 close to the limit plate 47 is equal to the distance between the bottom of the through groove 12 and the bottom of the positioning plate 1. One end of the discharging plate 44 close to the rotating shaft 41 is fixedly connected with a connecting plate 441, and two ends of the connecting plate 441 are respectively and fixedly connected to the two supporting plates 42. When the support plate 42 is in a horizontal position, the stripper plate 44 is also in a horizontal position and the top of the stripper plate 44 is flush with the top of the support plate 42. When the stripper plate 44 is in a horizontal position, the discharge cylinder 45 is located at the bottom of the stripper plate 44. When the positioning plate 1 is contacted with the connecting plate 441 on the side close to the rotating shaft 41, the piston rod of the discharging hydraulic cylinder 45 can pass through the abdicating hole 11.
When the concrete positioning plate is used, the supporting plate 42 is rotated to the horizontal position, then the concrete block and the positioning plate 1 are placed at the top of the supporting plate 42, the positioning plate 1 is positioned on one side, away from the rotating shaft 41, of the limiting plate 47, then the rotating shaft 41 rotates, the positioning plate 1 slides towards the direction close to the rotating shaft 41 under the action of self gravity, and when the supporting plate 42 is in the vertical position, the positioning plate 1 is in contact with the connecting plate 441; the discharge cylinder 45 then pushes the concrete block through the piston rod to disengage from the locating column 2 and fall onto the hopper.
Referring to fig. 5 and 7, two power assemblies 46 are disposed on the sides of the two baffles 43 facing away from each other, and each power assembly 46 includes a bottom plate 461 fixedly connected to the hopper and located below the rotating shaft 41, and a power cylinder 462 rotatably connected to the top of the bottom plate 461. Two fixing plates 463 fixedly connected to the top of the base plate 461 are disposed on two sides of the hydraulic cylinder 462 near one end of the base plate 461, and two rotating shafts 464 respectively rotatably connected to the two fixing plates 463 are fixedly connected to two sides of the hydraulic cylinder 462 near the fixing plates 463. One side of the baffle 43, which is far away from the other baffle 43, is fixedly connected with a fixed shaft 465, and a piston rod of the power hydraulic cylinder 462 is rotatably connected to the fixed shaft 465; the axis of the rotating shaft 464 and the fixed shaft 465 are parallel to the axis of the rotating shaft 41. The extension and retraction of the piston rod of the power cylinder 462 causes the support plate 42 to rotate.
The working principle of the concrete block unloading equipment when in use is as follows: when the concrete positioning plate is used, the supporting plate 42 is rotated to the horizontal position, then the concrete block and the positioning plate 1 are placed at the top of the supporting plate 42, the positioning plate 1 is positioned on one side, away from the rotating shaft 41, of the limiting plate 47, then the rotating shaft 41 rotates, the positioning plate 1 slides towards the direction close to the rotating shaft 41 under the action of self gravity, and when the supporting plate 42 is in the vertical position, the positioning plate 1 is in contact with the connecting plate 441; the discharge cylinder 45 then pushes the concrete block through the piston rod to disengage from the locating column 2 and fall onto the hopper.
Example three: a construction method for dismantling a overpass bridge on a highway comprises the following steps:
a. measuring and scribing: measuring the top of a to-be-removed overpass, calculating the size of each rectangular concrete block after cutting according to the width of the overpass after removing a flange plate and the length to be removed, then marking the position and the shape of each concrete block at the top of the overpass in a marking mode, calculating the size of the rectangular concrete block cut by the flange plate according to the size of the flange plate, marking the top of the flange plate to mark the position and the shape of the concrete block to be cut by the flange plate, then marking four positions to be punched at the top of each concrete block, wherein the four holes are respectively positioned at the positions close to four corners of the top of the concrete block;
b. punching: punching the punched position marked at the top of the concrete block, wherein the hole is vertically formed and completely penetrates through the overpass;
c. reference column 2 and the installation of locating plate 1: selecting a positioning plate 1 with the size smaller than the size of the top of the concrete block, inserting four positioning columns 2 at the top of the positioning plate 1 into four holes formed in the concrete block, then connecting a pre-fixing nut on the positioning columns 2 in a threaded manner, and rotating the pre-fixing nut to enable the pre-fixing nut to be in contact with the top surface of the overpass;
d. foundation treatment: excavating soft soil in a tight abutting range under a high-speed bridge, backfilling by using limestone, compacting the limestone after backfilling, backfilling the limestone by adopting a layered backfilling mode when the limestone is backfilled, controlling the thickness of each backfilling to be 30cm, compacting after each layer of backfilling is finished, backfilling the next layer after the layers are completely compacted, and compacting again at the backfilling part by using a road roller after all backfilling is finished; after backfilling is finished, pouring concrete into the foundation, paving a layer of concrete on the top of the foundation, troweling the top of the concrete layer, covering geotextile on the concrete layer and performing watering maintenance after the concrete layer is paved, wherein the maintenance time is not shorter than seven days;
e. erecting a scaffold under a high-speed bridge: the method comprises the following steps of constructing a scaffold of the floor under the high-speed bridge, wherein the constructed scaffold belongs to a full-hall frame, one end of the bottom of the bottommost vertical scaffold is driven into a foundation, one end of the top of the topmost vertical scaffold is fixed to the bottom of the high-speed bridge, and the bottom of each I-shaped beam of the high-speed bridge is enabled to be abutted against the scaffold;
f. erecting a scaffold on the high-speed bridge: the method comprises the following steps of constructing scaffolds at the top of the high-speed bridge, wherein one end of the bottom of the bottommost vertical scaffold is abutted against the top of the high-speed bridge, the top of the topmost vertical scaffold is abutted against the bottom of a positioning plate 1, except for the positioning plate 1 at the bottom of a flange plate, the position, close to four corners, of the bottom of each positioning plate 1 is respectively abutted against one vertical scaffold, four limiting tubes 13 are fixedly connected to the positions, close to the four corners, of the bottom of each positioning plate 1, and one ends of the tops of the four vertical scaffolds at the bottom of each positioning plate 1 are respectively inserted into the four limiting tubes 13;
g. erecting scaffolds on two sides of the high-speed bridge: erecting scaffolds on two sides of the high-speed bridge, driving the bottom of the bottommost vertical scaffold into the foundation, and tightly abutting one end of the top of the topmost vertical scaffold against the top of the overpass bridge;
h. removing the guardrail and the flange plate: firstly, the tops of four positioning columns 2 corresponding to concrete to be cut are respectively connected with four connecting columns 33, a hook of a crane is connected with a lifting ring 31 on a lifting disc 3, so that four lifting ropes 32 are in a tightened state, then the concrete block is cut, and after the cut concrete block is unloaded, the next concrete block is cut until the flange plate is completely cut;
i. hoisting the flange plate: hoisting the cut flange plates to a turnover mechanism 4 of a transport vehicle, detaching a hoisting rope 32 from a positioning column 2, then turning a positioning plate 1 to a vertical position by the turnover mechanism 4, and pushing concrete blocks into a hopper of the transport vehicle through a discharging hydraulic cylinder 45;
j. cutting and hoisting concrete blocks: after hoisting of the flange plate is finished, cutting and cutting are carried out according to a scribing overpass at the top of the overpass, before a concrete block is cut, the tops of four positioning columns 2 corresponding to the concrete to be cut are respectively connected with four connecting columns 33, a hook of a crane is connected with a hanging ring 31 on a hoisting disc 3, so that four hoisting ropes 32 are in a tightening state, then the concrete block is cut, the cut flange plate is hoisted to a turnover mechanism 4 of a transport vehicle, the hoisting ropes 32 are dismounted from the positioning columns 2, then the positioning plate 1 is turned to a vertical position by the turnover mechanism 4, and the concrete block is pushed into a hopper of the transport vehicle through a discharging hydraulic cylinder 45; when in cutting, symmetrical cutting is carried out from two sides of the overpass bridge;
k. dismantling the scaffold: and (5) dismantling the scaffold.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. A construction method for dismantling a overpass bridge on a highway is characterized by comprising the following steps: the method comprises the following steps:
a. measuring and scribing: measuring the top of a to-be-removed overpass, calculating the size of each rectangular concrete block after cutting according to the width of the overpass after removing a flange plate and the length to be removed, then marking the position and the shape of each concrete block at the top of the overpass in a marking mode, calculating the size of the rectangular concrete block cut by the flange plate according to the size of the flange plate, marking the top of the flange plate to mark the position and the shape of the concrete block to be cut by the flange plate, then marking four positions to be punched at the top of each concrete block, wherein the four holes are respectively positioned at the positions close to four corners of the top of the concrete block;
b. punching: punching the punched position marked at the top of the concrete block, wherein the hole is vertically formed and completely penetrates through the overpass;
c. the positioning column (2) and the positioning plate (1) are installed: selecting a positioning plate (1) with the size smaller than the size of the top of the concrete block, inserting four positioning columns (2) at the top of the positioning plate (1) into four holes formed in the concrete block, then connecting a pre-fixing nut to the positioning columns (2) in a threaded manner, and rotating the pre-fixing nut to enable the pre-fixing nut to be in contact with the top surface of the overpass;
d. foundation treatment: excavating soft soil in the foundation range under the high-speed bridge, then backfilling by using limestone, and compacting the limestone after backfilling;
e. erecting a scaffold under a high-speed bridge: building a landing scaffold under the high-speed bridge, wherein one end of the bottom of the bottommost vertical scaffold is driven into a foundation, and one end of the top of the topmost vertical scaffold is fixed at the bottom of the high-speed bridge;
f. erecting a scaffold on the high-speed bridge: the method comprises the following steps of constructing scaffolds at the top of the high-speed bridge, wherein one end of the bottom of the bottommost vertical scaffold is tightly abutted against the top of the high-speed bridge, the top of the topmost vertical scaffold is tightly abutted against the bottom of a positioning plate (1), except for the positioning plate (1) at the bottom of a flange plate, the position, close to four corners, of the bottom of each positioning plate (1) is respectively tightly abutted against one vertical scaffold, four limiting pipes (13) are fixedly connected to the positions, close to the four corners, of the bottom of each positioning plate (1), and one ends of the tops of the four vertical scaffolds at the bottom of each positioning plate (1) are respectively inserted into the four limiting pipes (;
g. erecting scaffolds on two sides of the high-speed bridge: erecting scaffolds on two sides of the high-speed bridge, driving the bottom of the bottommost vertical scaffold into the foundation, and tightly abutting one end of the top of the topmost vertical scaffold against the bottom of the overpass bridge;
h. removing the guardrail and the flange plate: firstly, connecting hoisting ropes (32) at the tops of positioning columns (2) corresponding to a concrete block to be cut, connecting the hoisting ropes (32) on the four positioning columns (2) corresponding to the concrete block to a lifting hook of the same crane, so that the hoisting ropes (32) are in a tightened state, then cutting the concrete block, and after the cut concrete block is dismounted, cutting the next concrete block until the flange plate is completely cut;
i. hoisting the flange plate: hoisting the cut flange plates to a turnover mechanism (4) of a transport vehicle, detaching hoisting ropes (32) from a positioning column (2), then turning the positioning plate (1) to a vertical position by the turnover mechanism (4), and pushing concrete blocks into a hopper of the transport vehicle through a discharging hydraulic cylinder (45);
j. cutting and hoisting concrete blocks: after hoisting of the flange plate is finished, cutting the overpass according to a marking line at the top of the overpass, before cutting the concrete block, connecting hoisting ropes (32) on four positioning columns (2) corresponding to the concrete block to a lifting hook of the same crane, enabling the hoisting ropes (32) to be in a tightened state, then cutting the concrete block, hoisting the cut concrete block to a turnover mechanism (4) of a transport vehicle, detaching the hoisting ropes (32) from the positioning columns (2), then turning a positioning plate (1) to a vertical position by the turnover mechanism (4), and pushing the concrete block to a hopper of the transport vehicle through an unloading hydraulic cylinder (45); when in cutting, symmetrical cutting is carried out from two sides of the overpass bridge;
k. dismantling the scaffold: and (5) dismantling the scaffold.
2. The construction method for dismantling the overpass bridge on the expressway according to claim 1, wherein: and d, backfilling the limestone by adopting a layered backfilling mode when the limestone is backfilled, controlling the thickness of each backfilling to be 30cm, compacting after each layer of backfilling is finished, backfilling the next layer after the layers are completely compacted, and compacting the backfilled part again by using a road roller after all layers are backfilled.
3. The construction method for dismantling the overpass bridge on the expressway according to claim 1, wherein: and d, after backfilling is finished, pouring concrete into the foundation, paving a layer of concrete on the top of the foundation, troweling the top of the concrete layer, covering geotextile on the concrete layer and performing watering maintenance after the concrete layer is paved, wherein the maintenance time is not shorter than seven days.
4. The construction method for dismantling the overpass bridge on the expressway according to claim 1, wherein: and e, the built scaffold belongs to a full hall frame, and the scaffold is guaranteed to be supported at the bottom of each I-shaped beam of the high-speed bridge.
5. The construction method for dismantling the overpass bridge on the expressway according to claim 1, wherein: the one end that deviates from reference column (2) of four hoist and mount ropes (32) that are connected with four reference columns (2) on locating plate (1) is connected on a hoist and mount dish (3) jointly, and the length of four hoist and mount ropes (32) equals, and hoist and mount dish (3) top fixedly connected with rings (31).
6. The construction method for dismantling the overpass bridge on the expressway according to claim 5, wherein: connecting hole (22) coaxial with reference column (2) have been seted up to the top one end of reference column (2), and hoist and mount rope (32) deviate from one end fixedly connected with of hoist and mount dish (3) and connecting post (33) that connecting hole (22) diameter equals, connecting post (33) can insert in the middle of connecting hole (22) and be in the same place with reference column (2) threaded connection.
7. The construction method for dismantling the overpass bridge on the expressway according to claim 1, wherein: the turnover mechanism (4) comprises a rotating shaft (41) which is rotatably connected to the bottom of one end, away from the vehicle head, of the vehicle hopper, two supporting plates (42) which are fixedly connected to the rotating shaft (41), two baffle plates (43) which are fixedly connected to one sides, far away from each other, of the two supporting plates (42), a limiting plate (47) which is fixedly connected to one sides, close to each other, of the two baffle plates (43), and a discharging hydraulic cylinder (45) which is used for pushing the concrete block to be separated from the positioning column (2;
the axis direction level of axis of rotation (41) sets up and is parallel to each other with the width direction of car hopper bottom, the length direction of two backup pads (42) is parallel to each other and the length direction of backup pad (42) and the axis direction mutually perpendicular of axis of rotation (41), when backup pad (42) are in horizontal position, baffle (43) are located backup pad (42) top, two logical groove (12) have been seted up to locating plate (1) both sides, limiting plate (47) can insert in logical groove (12).
8. The construction method for dismantling the overpass bridge on the expressway according to claim 7, wherein: the distance between one side of the limiting plate (47) close to the supporting plate (42) and one side of the supporting plate (42) close to the limiting plate (47) is equal to the distance between the bottom of the through groove (12) and the bottom of the positioning plate (1).
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| JP2003252563A (en) * | 2002-03-07 | 2003-09-10 | Oriental Construction Co Ltd | Method of dismantling concrete structure and lifting sling used in dismantling |
| CN201330112Y (en) * | 2008-11-04 | 2009-10-21 | 中铁六局集团有限公司 | Hoisting tool for hollow slab beam |
| CN109208938B (en) * | 2018-10-22 | 2020-11-27 | 深圳市工勘岩土集团有限公司 | Directional nondestructive static cutting demolition processing method for reinforced concrete slab |
| CN110792044B (en) * | 2019-08-22 | 2021-09-03 | 中铁十二局集团有限公司 | Construction method for quickly dismantling overpass |
| CN110577146A (en) * | 2019-09-30 | 2019-12-17 | 上海公路桥梁（集团）有限公司 | Lifting appliance and method for removing old bridge body |
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Address after: No.30, Tiancheng Road, Tianqiao District, Jinan City, Shandong Province Patentee after: Shandong highway and Bridge Construction Group Co.,Ltd. Address before: No.30, Tiancheng Road, Tianqiao District, Jinan City, Shandong Province Patentee before: SHANDONG HIGHWAY & BRIDGE CONSTRUCTION Co.,Ltd. |