CN112663501B - Upper-span existing line steel box girder structure and construction method - Google Patents
Upper-span existing line steel box girder structure and construction method Download PDFInfo
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- CN112663501B CN112663501B CN202011502092.5A CN202011502092A CN112663501B CN 112663501 B CN112663501 B CN 112663501B CN 202011502092 A CN202011502092 A CN 202011502092A CN 112663501 B CN112663501 B CN 112663501B
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Abstract
The invention relates to a steel box girder structure of an existing line of an upper span and a construction method, and the scheme comprises a steel box girder, an adjusting steel cylinder, double-spliced I-shaped steel, a lattice type bracket and an embedded steel plate which are arranged in sequence from top to bottom; the top of the adjusting steel cylinder supports the steel box girder through a steel cylinder supporting plate, the bottom of the adjusting steel cylinder is fixedly connected with the double-spliced I-shaped steel, and the height of the steel box girder can be adjusted by adjusting the height of the adjusting steel cylinder; the double-spliced I-shaped steel is abutted against the top of the lattice type support; the bottom of the lattice type support is fixed with the embedded steel plate through a connecting piece; the embedded steel plate is arranged in the concrete foundation; the left side and the right side of the bottom of the lattice type support are respectively provided with the cloth bag bags, and each cloth bag is filled with fine sand.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to an existing line steel box girder structure striding upwards and a construction method.
Background
The steel box girder bridge has the advantages of high bending and torsional rigidity, light dead weight and short construction period, and the steel box girder main girder structure is widely adopted in recent years along with the requirements of the construction of viaducts, high-speed ramp bridges and overpasses. Considering the conditions of small influence on road traffic at the lower part of the bridge, short construction period, higher requirement on construction organization and the reasonability of pier arrangement, the steel box girder which has strong spanning capability, high processing speed, convenient installation and maintenance, light weight and attractive appearance is often the first choice.
But the following problems exist in the construction process of the existing steel box girder structure spanning the existing line at present:
(1) the temporary support system has low construction efficiency due to large welding workload and seriously influences the engineering progress;
(2) temporary support systems on two sides of a traffic lane are greatly influenced by vehicles, so that the collision phenomenon often occurs, and the potential safety hazard is serious;
(3) the height of the steel box girder at the top of the cross beam cannot be accurately adjusted, and the working error is large;
(4) when the temporary support system is dismantled, the foot needs to be provided with the dumping limiting device, so that the construction is inconvenient, and the support dismantling efficiency is seriously influenced.
Disclosure of Invention
The invention aims to provide an existing overhead line steel box girder structure and a construction method aiming at the problems in the prior art.
In order to realize the purpose of the invention, the invention adopts the following technical scheme: a steel box girder structure of an existing overpass line comprises a steel box girder, an adjusting steel cylinder, double-spliced I-shaped steel, a lattice type support and an embedded steel plate which are sequentially arranged from top to bottom; the top of the adjusting steel cylinder supports the steel box girder through a steel cylinder supporting plate, the bottom of the adjusting steel cylinder is fixedly connected with the double-spliced I-shaped steel, and the height of the steel box girder can be adjusted by adjusting the height of the adjusting steel cylinder; the double-spliced I-shaped steel is abutted against the top of the lattice type support; the bottom of the lattice type support is fixed with the embedded steel plate through a connecting piece; the embedded steel plate is arranged in the concrete foundation; the left side and the right side of the bottom of the lattice type support are respectively provided with a cloth bag, and each cloth bag is filled with fine sand.
The working principle and the beneficial effects are as follows: the fabric bags positioned on the two sides of the traffic lane can effectively prevent the damage to the lattice type support caused by the vehicle collision, and can also effectively protect the vehicle safety, and the fabric bags can absorb the impact force and reduce the potential safety hazard; compared with the prior art, the structure has fewer welding positions and is mainly divided into a multi-section structure, and all sections are not welded and fixed but can be disassembled and fixed, so that the welding workload is small during construction, the construction efficiency is high, the engineering progress can be remarkably improved, particularly, the construction can be repeatedly utilized after disassembly, and the cost is saved; the height of the steel box girder can be adjusted, and the steel box girder can be accurately adjusted by matching with the existing measuring tool, so that the error of the steel box girder can be minimized; when lattice formula support demolishs, one row of connecting piece is torn down alone to the accessible to accomplish with the help of common electric hoist or loop wheel machine on the building site and demolish the operation, compare prior art and need not to set up alone and empty stop device, convenient construction demolishs efficiently.
Furthermore, every it is equipped with a plurality of steel section of thick bamboo bracing all around to adjust the steel section of thick bamboo, and every steel section of thick bamboo bracing bottom links firmly with the double pin I-steel, and every it all links firmly a steel section of thick bamboo backup pad to adjust the steel section of thick bamboo top, adjust the lift of steel section of thick bamboo backup pad through the handle regulation. This setting can show the support intensity who promotes the regulation steel drum, has good supporting effect to the steel box girder, and simple structure can conveniently realize the elevation of steel box girder through the handle and adjust, and wherein the structure of handle drive steel drum backup pad is conventional technological means, no longer gives unnecessary details to its structure here.
Furthermore, an integral stiff I-shaped steel frame is arranged between the cloth bag and the concrete foundations on the left side and the right side of the bottom of the lattice type support, the integral stiff I-shaped steel frame is abutted against the cloth bag, and a gap is formed between the integral stiff I-shaped steel frame and the concrete foundations. According to the arrangement, the cloth bag can be effectively supported through the integral stiff I-shaped steel frame, the integral stiff I-shaped steel frame has certain elasticity, and the cloth bag can be prevented from directly impacting the concrete foundation and the bottom of the lattice type support, so that the lattice type support can be effectively protected, vehicles can be protected through the cloth bag, and potential safety hazards are reduced.
Furthermore, a plurality of base steel plates are arranged at the bottom of the lattice type support, and each base steel plate is fixed with the embedded steel plate through a high-strength bolt. This setting, the main part that processes lattice formula support earlier is fixed base steel sheet and lattice formula support welded again, not only convenient transportation, also convenient equipment, also makes things convenient for the later stage to dismantle simultaneously.
Further, a cement cushion layer is laid at the bottom of each concrete foundation. This setting can show the fixed strength who promotes concrete foundation and ground, prevents that the soft unstable condition of concrete foundation that leads to in ground from taking place.
Further, lattice formula support includes support steel pipe, stull and bracing, support steel pipe bottom is equipped with the steel pipe that links firmly with the base steel sheet and enlarges the end, just the support steel pipe top has linked firmly the backup pad, backup pad and double-pin I-steel bottom butt, the stull links firmly between two adjacent support steel pipes, the bracing is located between two adjacent stulls and is formed X shape, just the bracing both ends link firmly with two adjacent support steel pipes respectively. This setting can show the structural strength who promotes lattice formula support, especially horizontal and vertical bearing capacity, and simple structure, easy dismounting.
Furthermore, a plurality of reinforcing rib plates are arranged on the periphery of the bottom of the supporting plate. With the arrangement, the strength of the support plate can be obviously improved.
A construction method of an existing line steel box girder structure strides upwards comprises the following installation steps:
s1: construction preparation, wherein the construction preparation at least comprises the steps of measuring and marking a construction site and processing related parts;
s2: excavating a foundation pit and tamping a foundation;
s3: constructing a cushion layer and a concrete foundation, pouring a cement cushion layer with the thickness not less than 20cm on the tamped foundation, hardening, pouring the concrete foundation on the cement cushion layer, and pre-burying a pre-buried steel plate in the pouring process;
s4: mounting a lattice type support, welding a support steel pipe to a base steel plate and fixing the support steel pipe with an embedded steel plate through a high-strength bolt;
s5: welding a cross brace and an inclined brace on the support steel pipe to form a temporary steel pipe support system;
s6: welding a support plate on the top of the support steel pipe and installing double-spliced I-shaped steel;
s7: installing an adjusting steel cylinder on the double-spliced I-shaped steel, adjusting the height of a steel cylinder supporting plate through a handle, marking a plurality of monitoring points at two ends of the double-spliced I-shaped steel, wherein the monitoring points are used for settlement monitoring of a temporary steel pipe bracket system;
s8: installing an integral type impact-proof system of the stiff sand-filled bag;
s9: hoisting the steel box girder, retesting the monitoring points, fixing and reinforcing each connecting part of the lattice type support again if the deviation of the monitoring points is greater than a preset value, and continuing to execute the operation if the deviation of the monitoring points is less than the preset value;
s10: after the temporary steel pipe support system is settled stably, the elevation of the steel box girder is adjusted by using an adjusting steel cylinder until the elevation meets the design requirement, and the butt joint seam of the steel box girder is welded;
s11: manually adjusting a handle to enable the steel box girder to slowly descend until the steel box girder falls on a welding base plate of a pier support so that all loads of the steel box girder are converted into self-bearing loads of the pier, and unloading is finished;
s12: dismantling the double-spliced I-shaped steel;
s13: and (5) removing the temporary steel pipe support system.
Further, wherein demolish double pin I-steel including the following step:
s121: after the steel cylinder supporting plate is separated from the steel box girder, the adjusting steel cylinder is detached;
s122: two ends of the double-spliced I-shaped steel are tied with steel wire ropes, and the steel wire ropes are connected with a winch;
s123: starting a winch to tighten the steel wire rope, and cutting a welding point between the double-spliced I-shaped steel and the supporting plate by adopting gas cutting;
s124: and the double-spliced I-shaped steel is hung to the ground through a winch.
Compared with the prior art, the prefabricated assembly type quick-connection foundation temporary steel pipe support system is adopted, the bottom of the support steel pipe is connected with the foundation through the high-strength bolt, welding is not needed, the construction speed is high, the bottom of the support steel pipe is provided with the expanded end, and the stability is good; the integral type stiff sand-filled bag anti-collision system is arranged at the bottom of the temporary steel pipe support system, so that a vehicle can be effectively prevented from directly impacting the temporary steel pipe support system, and the safety performance is good; the adjustable adjusting steel cylinder is arranged at the top of the temporary steel pipe support system, so that the elevation of the steel box girder can be accurately adjusted, and the error is small; when interim steel pipe support system was demolishd, the high strength bolt of make full use of steel pipe bottom was as empting stop device, and maneuverability is strong, and safety, stability are good when interim support system is emptyd, demolish fastly.
Further, the method for dismantling the temporary steel pipe support system comprises the following steps:
s131: two temporary lifting lugs are arranged at the bottom of the steel box girder;
s132: cutting the cross brace and the diagonal brace between the temporary steel pipe support systems by gas cutting;
s133: connecting a steel pipe ear ring welded on the support steel pipe with the temporary lifting lug through an electric hoist;
s134: dismantling the high-strength bolts between the embedded steel plates at the bottom of the support steel pipe and the base steel plate, and only keeping the high-strength bolts at one side in the dumping direction;
s135: driving an electric hoist to incline the support steel pipe, so that the support steel pipe rotates around the retained row of high-strength bolts;
s136: placing the support steel pipe in a horizontal state and finally falling to the ground;
s137: removing the temporary lifting lug by using a movable scaffold;
s138: and (4) completely coating the damaged part of the coating.
Drawings
FIG. 1 is a schematic structural view of a temporary steel pipe bracket system supporting a steel box girder according to the present invention;
FIG. 2 is a schematic plan view of an integral stiff sand-filled bladder bag impact protection system in accordance with the present invention;
FIG. 3 is an enlarged view of a connection structure of an adjusting steel cylinder and a double-spliced I-shaped steel;
FIG. 4 is a schematic diagram of the temporary steel pipe support system dismantling process of the present invention.
In the figure, 1, tamping a foundation; 2. a cement cushion layer; 3. a concrete foundation; 4. pre-burying a steel plate; 5. a base steel plate; 6. a high-strength bolt; 7. expanding the end of the steel pipe; 8. a support steel pipe; 9. welding the plate; 10. a cross brace; 11. bracing; 12. a reinforcing rib plate; 13. a support plate; 14. adjusting the steel cylinder; 15. a steel cylinder diagonal bracing; 16. a handle grip; 17. a steel cylinder support plate; 18. a steel box girder; 19. double-spliced I-shaped steel; 20. a cloth bag; 21. fine sand; 22. an integral stiff I-steel frame; 23. temporary lifting lugs; 24. an electric hoist; 25. a steel pipe earring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above terms should not be construed as limiting the present invention.
As shown in fig. 1-3, the existing-line-spanning steel box girder structure and the construction method thereof include a steel box girder 18, an adjusting steel cylinder 14, a double-spliced i-steel 19, a lattice-type support and an embedded steel plate 4, which are sequentially arranged from top to bottom, wherein the structure of the steel box girder 18 is the prior art, and is not described herein again, and the adjusting steel cylinder 14 may be a common jack structure.
Specifically, the top of each adjusting steel cylinder 14 supports a steel box girder 18 through a steel cylinder support plate 17, the bottom of each adjusting steel cylinder 14 is fixedly connected with a double-spliced I-shaped steel 19, a plurality of steel cylinder inclined struts 15 are arranged around each adjusting steel cylinder 14, the bottom of each steel cylinder inclined strut 15 is fixedly connected with the double-spliced I-shaped steel 19, the top of each adjusting steel cylinder 14 is fixedly connected with a steel cylinder support plate 17, the adjusting steel cylinder 14 adjusts the lifting of the steel cylinder 14 support plate 13 through a handle 16, the height adjustment of the steel box girder 18 can be conveniently realized through the handle 16, the structure of the handle 16 driving the steel cylinder support plate 17 is a conventional technical means, and the structure is not repeated;
specifically, the double-spliced I-shaped steel 19 abuts against the top of the lattice type support;
specifically, the bottom of the lattice type support and the embedded steel plate 4 are fixed through high-strength bolts 6;
specifically, the embedded steel plate 4 is arranged in the concrete foundation 3; the left side and the right side of the bottom of the lattice type support are respectively provided with a cloth bag 20, and fine sand 21 is filled in each cloth bag 20, and the cloth bags can be made of other materials.
Specifically, an integral stiff i-steel frame 22 is arranged between the cloth bag 20 and the concrete foundations 3 on the left and right sides of the bottom of the lattice type support, the integral stiff i-steel frame 22 is abutted against the cloth bag 20, and a gap is formed between the integral stiff i-steel frame and the concrete foundations 3. The cloth bag 20 can be effectively supported through the integral stiff I-shaped steel frame 22, the integral stiff I-shaped steel frame 22 has certain elasticity, the cloth bag 20 can be prevented from directly impacting the concrete foundation 3 and the bottom of the lattice type support, the lattice type support can be effectively protected, vehicles can be protected through the cloth bag 20, and potential safety hazards are reduced.
Preferably, a plurality of base steel plates 5 are arranged at the bottom of the lattice type support, and each base steel plate 5 is fixed with the embedded steel plate 4 through a high-strength bolt 6. This sets up the main part of processing earlier lattice formula support and then with base steel sheet 5 and lattice formula support welded fastening, not only convenient transportation also makes things convenient for the equipment, also makes things convenient for the later stage to dismantle simultaneously.
Specifically, a cement pad layer 2 is laid on the bottom of each concrete foundation 3. This setting can show the fixed strength who promotes concrete foundation 3 and ground, prevents that the soft condition that leads to concrete foundation 3 unstable in ground from taking place.
Specifically, lattice formula support includes support steel pipe 8, stull 10 and bracing 11, 8 bottoms of support steel pipe are equipped with the steel pipe that links firmly with base steel sheet 5 and expand end 7, just 8 tops of support steel pipe have linked firmly backup pad 13, backup pad 13 and 19 bottom butts of double-pin I-steel, bracing 10 links firmly between two adjacent support steel pipes 8, bracing 11 is located between two adjacent stulls 10 and is formed X shape, just 11 both ends of bracing link firmly with two adjacent support steel pipes 8 respectively. This setting can show the structural strength who promotes lattice formula support, especially horizontal and vertical bearing capacity, and simple structure, easy dismounting.
In the present embodiment, the side of the integral stiff i-steel frame 22 facing the fabric bag 20 is arc-shaped, which can significantly improve the anti-collision capability of the integral stiff i-steel frame 22, and can effectively prevent the damage of the lattice type bracket caused by the direct frontal impact of the automobile from the integral stiff i-steel frame 22.
Specifically, a plurality of reinforcing ribs 12 are provided around the bottom of the supporting plate 13. With this arrangement, the strength of the support plate 13 can be significantly improved.
A construction method for the construction of the upper-span existing line steel box girder 18 structure comprises the following steps:
(1) construction preparation: before construction, measurement and paying-off are carried out according to design requirements, the location point of each support steel pipe 8 of the temporary steel pipe support system is marked, and the specific size and position of the concrete foundation 3 are determined. Two support steel pipes 8 are combined into one piece to be manufactured and transported as one manufacturing unit in a manufacturing factory in advance, and a plurality of manufacturing units are manufactured.
(2) Tamping foundation 1: and excavating the foundation pit by adopting an excavator, and removing the surface soft layer until the original soil is obtained. And after the foundation pit is excavated, compacting by adopting a vibratory roller of not less than 18t and tamping by adopting a tamping hammer, wherein the bearing capacity of the foundation after tamping is not less than 350 Kpa.
(3) Constructing a cushion layer and a concrete foundation 3: and pouring a cement cushion layer 2 with the thickness not less than 20cm on the rammed foundation 1 for hardening treatment, after the strength of the cement cushion layer 2 meets the design requirement, erecting a mould according to the plane size of the foundation design and pouring a C25 concrete foundation 3, wherein the concrete pouring thickness is 40cm, embedding a steel plate 4 on the top surface of the concrete foundation 3, and leveling the top surface of the embedded steel plate 4.
(4) The bottom of the support steel pipe 8 is fixed: after the strength of the concrete foundation 3 meets the design requirement, the steel pipe expansion end 7 at the end part of the support steel pipe 8 is welded with the base steel plate 5, the support steel pipe 8 is vertically hoisted to the concrete foundation 3 by using a crane, and after the position of the support steel pipe is accurately adjusted, the base steel plate 5 and the embedded steel plate 4 are fixed through the high-strength bolt 6.
(5) Welding the cross brace 10 and the inclined brace 11: after a manufacturing unit formed by two support steel pipes 8 is fixed, a welding plate 9 is welded on the support steel pipe 8, a cross brace 10 and an inclined brace 11 are welded between two adjacent manufacturing units, and the end parts of the cross brace 10 and the inclined brace 11 are welded on the welding plate 9, so that a plurality of manufacturing units are connected into an integral temporary steel pipe support system.
(6) Installing double-spliced I-shaped steel 19: after the temporary steel pipe support system is connected, a support plate 13 is welded to the top of the support steel pipe 8, a plurality of reinforcing rib plates 12 are welded to the lower portion of the support plate 13, whether the top of the support plate 13 is horizontal or not is accurately measured, whether the top of the support plate 13 is located at the same elevation or not is checked, the double-spliced 45a I-steel is hoisted to the support plate 13, the length of the double-spliced I-steel 19 is adjusted according to the difference of the bridge bottom width, and the double-spliced I-steel 19 is welded to the support plate 13.
(7) Installing and adjusting the steel cylinder 14: an adjusting steel cylinder 14 is erected at the top of the double-spliced I-shaped steel 19, a steel cylinder inclined strut 15 and the double-spliced I-shaped steel 19 are welded, a handle 16 is manually adjusted to enable the height of a steel cylinder supporting plate 17 to meet requirements, and a plurality of monitoring points are marked at two ends of the double-spliced I-shaped steel 19 and used for settlement monitoring of a temporary steel pipe support system.
(8) Installing an integral type stiff sand filling bag anti-collision system: the two sides of a concrete foundation 3 at the bottom of a temporary steel tube support system standing on the two sides of a traffic lane are provided with a semi-surrounding cloth bag 20 with a certain width and height, fine sand 21 is filled in the cloth bag 20, and the inner side of the cloth bag 20 is provided with an integral stiff I-shaped steel frame 22 as a supporting structure, so that a vehicle is prevented from directly impacting the temporary steel tube support system.
(9) Hoisting the steel box girder 18: the steel box girder 18 is hoisted by a large truck crane section by section, the steel box girder 18 is placed on the steel cylinder supporting plate 17, a plurality of monitoring points are marked at two ends of the double-spliced I-shaped steel 19 which is retested for not less than 48 hours after the hoisting of the steel box girder 18 is finished, and a temporary steel pipe bracket system needs to be reinforced if a large deviation is found.
(10) Unloading the steel box girder 18: and after the temporary steel pipe support system is settled and stabilized, the elevation of the steel box girder 18 is adjusted by using the adjusting steel cylinder 14 until the elevation meets the design requirement, and the welding of the steel box girder 18 to the joint is carried out. And after the welding of the steel box girder 18 is finished, the steel box girder 18 is integrally unloaded, the handle 16 is manually adjusted to slowly descend the steel box girder 18 until the steel box girder 18 falls on a bridge pier support welding base plate, all loads of the steel box girder are converted into self bearing of a bridge pier, and the unloading is finished, wherein the bridge pier support welding base plate is the prior art and is not shown in the attached drawings.
(11) Dismantling the double-spliced I-shaped steel 19: after the steel cylinder supporting plate 17 is separated from the steel box girder 18, the adjusting steel cylinder 14 and the auxiliary structures thereof are disassembled, the steel wire ropes are tied at the two ends of the double-spliced I-shaped steel 19 and are connected with the winch, the winch is started to tension the steel wire ropes, the welding point of the double-spliced I-shaped steel 19 and the supporting plate 13 is cut open by gas cutting, and the double-spliced I-shaped steel 19 is hung to the ground through the winch.
(12) The temporary steel pipe bracket system comprises: as shown in fig. 4, a schematic diagram of a dismantling process of a temporary steel pipe support system is shown, two temporary lifting lugs 23 are installed at the bottom of a steel box girder 18, a cross brace 10 and an inclined brace 11 between the temporary steel pipe support systems are cut by gas cutting, an electric hoist 24 connects a steel pipe ear ring 25 welded on a support steel pipe 8 with the temporary lifting lugs 23, two rows of high-strength bolts 6 between an embedded steel plate 4 at the bottom of the support steel pipe 8 and a base steel plate 5 are dismantled, only the high-strength bolts 6 at one side of the toppling direction are reserved, the support steel pipe 8 is inclined by the electric hoist 24, the support steel pipe 8 rotates around the reserved row of high-strength bolts 6, the support steel pipe 8 is slowly placed in a horizontal state and finally falls to the ground, a movable scaffold is used for dismantling the temporary lifting lugs 23, and the damaged part of a coating is completely repaired. The part of the detached temporary steel pipe support system can be repeatedly used, waste is reduced, and compared with the prior art, the detachable temporary steel pipe support system is not required to be independently provided with an overturning limiting device, is convenient to construct and is high in detaching efficiency.
The details of the present invention are not described in detail since they are prior art.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
Although terms such as a rammed foundation 1, a cement cushion 2, a concrete foundation 3, an embedded steel plate 4, a base steel plate 5, a high-strength bolt 6, a steel pipe expansion end 7, a support steel pipe 8, a welding plate 9, a cross brace 10, an inclined brace 11, a reinforcing rib plate 12, a support plate 13, an adjusting steel cylinder 14, a steel cylinder inclined brace 15, a handle 16, a steel cylinder support plate 17, a steel box girder 18, a double-spliced i-shaped steel 19, a cloth bag 20, fine sand 21, an integral stiff i-shaped steel frame 22, a temporary lifting lug 23, an electric hoist 24, a steel pipe ear 25 and the like are used more frequently, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as the present application, fall within the protection scope of the present invention.
Claims (6)
1. A steel box girder structure of an existing line striding upwards is characterized by comprising a steel box girder, an adjusting steel cylinder, double-spliced I-shaped steel, a lattice type support and an embedded steel plate which are sequentially arranged from top to bottom; the top of the adjusting steel cylinder supports the steel box girder through a steel cylinder supporting plate, the bottom of the adjusting steel cylinder is fixedly connected with the double-spliced I-shaped steel, and the height of the steel box girder can be adjusted by adjusting the height of the adjusting steel cylinder; the double-spliced I-shaped steel is abutted against the top of the lattice type support; the bottom of the lattice type support is fixed with the embedded steel plate through a connecting piece; the embedded steel plate is arranged in the concrete foundation; cloth bag bags are arranged on the left side and the right side of the bottom of the lattice type support, and fine sand is filled in each cloth bag;
the bottom of each lattice type support is provided with a single base steel plate, and each base steel plate is fixed with the embedded steel plate through a high-strength bolt;
the lattice type support comprises support steel pipes, cross braces and inclined struts, the cross braces and the inclined struts are welded on the support steel pipes to form a temporary steel pipe support system, steel pipe expansion ends fixedly connected with a base steel plate are arranged at the bottoms of the support steel pipes, a supporting plate is fixedly connected to the top of each support steel pipe and abutted against the bottoms of double-spliced I-shaped steel pipes, the cross braces are fixedly connected between two adjacent support steel pipes, the inclined struts are arranged between two adjacent cross braces to form an X shape, and two ends of each inclined strut are fixedly connected with the two adjacent support steel pipes respectively;
the steps of dismantling the temporary steel pipe support system are as follows:
two temporary lifting lugs are arranged at the bottom of the steel box girder;
cutting the cross brace and the diagonal brace between the temporary steel pipe support systems by gas cutting;
connecting a steel pipe ear ring welded on the support steel pipe with the temporary lifting lug through an electric hoist;
dismantling the high-strength bolts between the embedded steel plates at the bottom of the support steel pipe and the base steel plate, and only keeping the high-strength bolts at one side in the dumping direction;
driving an electric hoist to incline the support steel pipe, so that the support steel pipe rotates around the retained row of high-strength bolts;
placing the support steel pipe in a horizontal state and finally falling to the ground;
removing the temporary lifting lug by using a movable scaffold;
and (4) completely coating the damaged part of the coating.
2. The overhead existing line steel box girder structure of claim 1, wherein a plurality of steel cylinder struts are arranged around each adjusting steel cylinder, the bottom of each steel cylinder strut is fixedly connected with a double-spliced I-shaped steel, a steel cylinder support plate is fixedly connected to the top of each adjusting steel cylinder, and the adjusting steel cylinder adjusts the lifting of the steel cylinder support plate through a handle.
3. The existing overhead line steel box girder structure of claim 1, wherein an integral stiff I-steel frame is arranged between the cloth bag and the concrete foundations at the left and right sides of the bottom of the lattice type support, the integral stiff I-steel frame is abutted against the cloth bag, and a gap is arranged between the integral stiff I-steel frame and the concrete foundations.
4. The over-existing line steel box girder structure according to claim 1, wherein a concrete cushion is laid on the bottom of each concrete foundation.
5. The overhead existing line steel box girder structure of claim 1, wherein a plurality of reinforcing ribs are provided around the bottom of the support plate.
6. A construction method of an existing line steel box girder structure strides upwards is characterized by comprising the following installation steps:
construction preparation, wherein the construction preparation at least comprises the steps of measuring and marking a construction site and processing related parts;
excavating a foundation pit and tamping a foundation;
constructing a cushion layer and a concrete foundation, pouring a cement cushion layer with the thickness not less than 20cm on the tamped foundation, hardening, pouring the concrete foundation on the cement cushion layer, and pre-burying a pre-buried steel plate in the pouring process;
mounting a lattice type support, welding a support steel pipe to a base steel plate and fixing the support steel pipe with an embedded steel plate through a high-strength bolt;
welding a cross brace and an inclined brace on the support steel pipe to form a temporary steel pipe support system;
welding a support plate on the top of the support steel pipe and installing double-spliced I-shaped steel;
installing an adjusting steel cylinder on the double-spliced I-shaped steel, adjusting the height of a steel cylinder supporting plate through a handle, and marking a plurality of monitoring points at two ends of the double-spliced I-shaped steel, wherein the monitoring points are used for settlement monitoring of a temporary steel pipe bracket system;
installing an integral type impact-proof system of the stiff sand-filled bag;
hoisting the steel box girder, retesting the monitoring points, fixing and reinforcing each connecting part of the lattice type support again if the deviation of the monitoring points is greater than a preset value, and continuing to execute the operation if the deviation of the monitoring points is less than the preset value;
after the temporary steel pipe support system is settled stably, the elevation of the steel box girder is adjusted by using an adjusting steel cylinder until the elevation meets the design requirement, and the butt joint seam of the steel box girder is welded;
adjusting a handle to enable the steel box girder to slowly descend until the steel box girder falls on a welding base plate of a pier support so that all loads of the steel box girder are converted into self-bearing loads of the pier, and unloading is completed;
dismantling the double-spliced I-shaped steel;
removing the temporary steel pipe support system;
wherein demolish double pin I-steel and include the following step:
after the steel cylinder supporting plate is separated from the steel box girder, the adjusting steel cylinder is detached;
two ends of the double-spliced I-shaped steel are tied with steel wire ropes which are connected with a winch;
starting a winch to tighten the steel wire rope, and cutting a welding point between the double-spliced I-shaped steel and the supporting plate by adopting gas cutting; the double-spliced I-shaped steel is hoisted to the ground through a winch;
the method for dismantling the temporary steel pipe support system comprises the following steps:
two temporary lifting lugs are arranged at the bottom of the steel box girder;
cutting the cross brace and the inclined brace between the temporary steel pipe support systems by gas cutting;
connecting a steel pipe ear ring welded on the support steel pipe with the temporary lifting lug through an electric hoist;
dismantling the high-strength bolts between the embedded steel plates at the bottom of the support steel pipe and the base steel plate, and only keeping the high-strength bolts at one side in the dumping direction;
driving an electric hoist to incline the support steel pipe, so that the support steel pipe rotates around the retained row of high-strength bolts;
placing the support steel pipe in a horizontal state and finally falling to the ground;
removing the temporary lifting lug by using a movable scaffold;
and (4) completely coating the damaged part of the coating.
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| CN113832868A (en) * | 2021-11-04 | 2021-12-24 | 中铁三局集团有限公司 | Dismantling device and construction method for railway temporary support |
| CN114263114A (en) * | 2021-12-21 | 2022-04-01 | 安徽省公路桥梁工程有限公司 | Construction system and construction method of large-section steel box girder |
| CN114250747B (en) * | 2021-12-28 | 2023-04-07 | 中交二航局第一工程有限公司 | Kong Koushi damper simply supported beam combined supporting device |
| CN114892539B (en) * | 2022-05-15 | 2023-07-25 | 中建七局第四建筑有限公司 | Steel box girder pushing construction support with sedimentation monitoring function and application method thereof |
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| CN103711078A (en) * | 2013-12-17 | 2014-04-09 | 北京工业大学 | Temporary girder-type support for bridge construction and dismantling method thereof |
| CN208072213U (en) * | 2018-02-12 | 2018-11-09 | 浙江交工集团股份有限公司 | A kind of steel box-girder installation temporary support |
| CN211312203U (en) * | 2019-07-30 | 2020-08-21 | 中铁上海工程局集团有限公司 | Equal-height double-box combined beam structure welding platform |
| CN111021256B (en) * | 2019-12-19 | 2021-04-27 | 中建六局土木工程有限公司 | Construction method for hoisting heavy-tonnage high-precision steel box girder |
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Denomination of invention: A Steel Box Beam Structure and Construction Method for Overcrossing Existing Lines Effective date of registration: 20230927 Granted publication date: 20220823 Pledgee: Industrial Bank Limited by Share Ltd. Wuhan branch Pledgor: HUBEI PROVINCIAL ROAD & BRIDGE Co.,Ltd. Registration number: Y2023980059401 |
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