Bailey beam support system dismounting and moving construction method

Abstract

The invention relates to a dismounting and moving construction method for a bailey beam support system, and relates to the technical field of building engineering construction. Comprising the steps of pre-burying point calibration, channel steel pre-burying, fixed pulley installation, winch in-place, conveying system building and fixing and area division, specifically, construction area division is conducted, specifically, according to the distance between Bailey beams and a conveying system, the Bailey beams are divided into three areas from the near to the distant, and the first area comprises three rows of Bailey beams on the right side; the second area comprises three rows of Bailey beams in the middle; the third area comprises three rows of bailey beams on the left side; the Bailey beams in the first area are integrally disassembled by a first winch and a fourth winch; the Bailey beams in the second area are mainly composed of the first winch and the fourth winch, and are assisted by the second winch and the third winch to be in charge of overall disassembly; and the Bailey beams in the third area are integrally disassembled by a first winch, a second winch, a third winch and a fourth winch. The method solves the problems that a conventional single body dismounting method is high in operation difficulty; the stability performance, the safety performance and the controllability are poor; the dismounting efficiency is low; and the construction period lag is influenced by the construction site.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering construction, in particular to a Bailey beam support system dismantling construction method. Background Art

[0002] With the rapid development of technical capabilities in the construction industry, steel tube Bailey beam-column supports have been widely used in the construction of cast-in-place bridge beams. Its advantages are reflected in the versatility of materials and the flexibility of construction, overcoming the shortcomings of uneven force and cumbersome assembly.

[0003] However, when encountering complex mountainous terrain, underpasses, etc., the conventional Bailey beam removal method is used to construct the steel pipe Bailey beam column support, which is no longer able to meet the on-site requirements; the cast-in-place bridges across highways and roads use the conventional Bailey beam removal method to remove the support, which hinders the normal passage of the road and causes a long period of blockage, resulting in low work efficiency. Since the conventional Bailey beam removal method is restricted by the on-site construction site, the construction speed is slow. The Bailey beam is dragged to the outside of the beam flange plate by hand-pulled fall chains, and then the Bailey beam is moved away from the double-jointed I-beam (transverse distribution beam) by a crane. Not only is the force uneven, the dragging stability is poor, and the traction controllability is poor, but it also requires a lot of manpower and material resources to cooperate with the implementation of high-altitude operations, and the construction safety risk is relatively high.

[0004] The specific relevant technical issues are introduced as follows:

[0005] 1) Conventional Bailey beam removal construction is generally divided into horizontal dragging method and single-body removal method according to the difficulty of Bailey beam removal at the specific construction site. Horizontal dragging method: First, use the hand-pulled fall chain to drag the Bailey beam to the outside of the beam flange plate, and then use the crane to move the Bailey beam away from the double-jointed I-beam (transverse distribution beam); this removal method has poor safety, stability and controllability, and low removal efficiency.

[0006] 2) Conventional Bailey beam dismantling construction, when the dismantling is difficult, generally adopts the single dismantling method: first dismantle the entire Bailey beam into many individual structures, and then use hand winches to dismantle them one by one; this dismantling method requires a large amount of manpower and material resources, is difficult to operate, causes delays in the construction period, and affects the subsequent construction schedule.

[0007] 3) Conventional Bailey beam removal construction: When encountering complex mountainous terrain, underpasses, etc., the conventional Bailey beam removal method is used to construct the steel pipe Bailey beam column support, which can no longer meet the site requirements; for cast-in-place bridges across highways and roads, the conventional Bailey beam removal method is used to remove the support, which hinders the normal passage of the road and causes a long period of blockage, low work efficiency, and high requirements for the type of construction site.

[0008] Therefore, how to provide a Bailey beam support system dismantling construction method has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0009] In order to solve at least one technical problem in the background technology, the present invention provides a Bailey beam support system dismantling construction method, which mainly solves the problems of the conventional single-body disassembly method, which is difficult to operate; has poor stability, safety and controllability; has low dismantling efficiency; is restricted by the construction site, and affects the construction period.

[0010] To achieve the above object, the present invention provides a Bailey beam support system dismantling construction method, comprising the following steps:

[0011] Step S1, pre-embedded point calibration: first, before construction, vertical measurement and layout are performed in situ according to the steel column support system (3) to calibrate the position of the pre-embedded point;

[0012] Step S2, pre-embed channel steel: during the pouring process, at each pre-embedded point, two channel steels (6) are pre-embedded vertically and symmetrically arranged along the bridge direction;

[0013] Step S3, fixed pulley installation: install a fixed pulley (8) at a distance of 0.2 m from the end of the double-jointed I-beam;

[0014] Step S4, hoisting the winch in place: hoisting four hoists (1) and placing them in place behind the winches;

[0015] Step S5, constructing and fixing the transmission system: embed the double-jointed I-beam (7) with the fixed pulley horizontally into the pre-buried channel steel (6) and fix them by welding using a cross fixing method;

[0016] Step S6, construction area division:

[0017] According to the distance of Bailey beam, the transmission system is divided into three areas from near to far: Area 1 mainly includes three rows of Bailey beams on the right; Area 2 mainly includes three rows of Bailey beams in the middle; Area 3 mainly includes three rows of Bailey beams on the left;

[0018] The Bailey beam in area No. 1 is dismantled by winches No. 1 and No. 4; the Bailey beam in area No. 2 is dismantled by traction mode with winches No. 1 and No. 4 as the main and winches No. 2 and No. 3 as the auxiliary; the Bailey beam in area No. 3 is dismantled jointly by winches No. 1, 2, 3 and 4.

[0019] Furthermore, when removing the No. 1 area, the No. 1 and No. 4 winches (1) are operated simultaneously. The winches are divided into three levels: low speed, medium speed and high speed. By grading from low to high, the drum is controlled to operate continuously at a uniform speed. A special person is assigned to monitor the disassembly posture of the Bailey beam (5) in the No. 1 area and report it in time. Since the steel wire ropes on the drums of the No. 1 and No. 4 winches evenly apply traction force through the corresponding fixed pulleys (8), the steel wire ropes in the drums must not be less than 4 turns during the traction operation, and the traction force acts on the Bailey beam below from both sides simultaneously. Generally, after the drum has been running for 8 to 10 seconds, the Bailey beam below becomes loose. At this time, the output power of the motor is adjusted, the operation speed of the drum is increased, and the dragging speed is maintained at 1.5 m / min. The lateral movement operation of the Bailey beam is completed and safety visualization is realized. After the Bailey beam moves to the outside of the lateral distribution beam (11), it is removed.

[0020] Further, the No. 2 area is dismantled: considering that the dragging distance of the No. 2 area is long, the No. 1 and No. 4 winches (1) are operated to provide traction and simultaneously act on the Bailey beam through the fixed pulleys on both sides to complete the dismantling; if the dismantling is difficult, on the basis of the traction provided by the No. 1 and No. 4 winches, the No. 2 and No. 3 winches are added as auxiliary equipment, and the traction is synchronously transmitted to the Bailey beam in the No. 2 area. During the traction operation, the wire rope in the drum shall not be less than 4 turns, and the traction acts on the lower Bailey beam from both sides synchronously; generally, after the drum has been running for 8 to 10 seconds, the lower Bailey beam becomes loose. At this time, the output power of the motor is adjusted, the running speed of the drum is increased, and the dragging speed is maintained at 1.5m / min; the lateral movement operation of the Bailey beam is completed, and safety visualization is realized. When the Bailey beam moves to the outside of the lateral distribution beam (11), it is removed.

[0021] Further, dismantling of area No. 3: considering the long dragging distance, in order to stabilize the dismantling posture of the Bailey beam, 4 winches are used at the same time, with winches No. 1, No. 2, No. 3 and No. 4 (1) acting synchronously on the Bailey beam in area No. 3. During the traction operation, the wire rope in the drum shall not be less than 4 turns, and the traction force acts synchronously on the Bailey beam below from both sides; generally, after the drum has been running for 8 to 10 seconds, the Bailey beam below becomes loose. At this time, the output power of the motor is adjusted, the running speed of the drum is increased, and the dragging speed is maintained at 1.5m / min; the lateral movement operation of the Bailey beam is completed, and safety visualization is realized. After the Bailey beam moves to the outside of the lateral distribution beam (11), it is removed.

[0022] Furthermore, in step S1, firstly, the in-situ vertical measurement and layout are performed according to the steel column support system (3). The distances from the beam ends along the bridge direction are 3.2m, 11.55m, 20.45m and 28.8m respectively; the distances from the curb in the transverse direction are measured 3m inwards, and four pre-embedded points are determined; the pre-embedded points are all located at the side webs of the cast-in-place box girder. During the casting process, at each pre-embedded point, two 20# channel steels are pre-embedded vertically and symmetrically along the bridge direction, with a spacing of 25.6cm, an embedded depth of 0.5m and an exposed length of 1m.

[0023] The beneficial effects of the present invention are:

[0024] The present invention provides a method for dismantling and moving a Bailey beam support system. By dismantling and moving the Bailey beam in different areas during the construction project, the span part is slowly moved horizontally to a position convenient for lifting, and then the Bailey beam is dismantled in coordination with relevant machinery. This method can not only release a large amount of labor, reduce construction costs, effectively shorten the construction period, solve the problem that the support system has high requirements for the on-site construction site, but also improve the economic benefits of the enterprise, promote green construction, and realize on-site safety visualization. By adjusting the operating parameters of the winch, the drum wire rope can synchronously apply traction to the Bailey beam to be towed with the help of the correct guidance of the fixed pulley, which can not only realize the horizontal movement of the Bailey beam that does not meet the lifting conditions on the support system to within the lifting range, but also greatly reduce the difficulty and safety risks of the traditional Bailey beam lifting, and the safety, stability and controllability are high. Moreover, the load bearing of the lifting equipment can be effectively controlled, the model of the lifting machinery can be accurately determined, and the cost of large-scale lifting machinery can be reduced. The construction method is convenient, has strong applicability, has low requirements for the construction site, improves construction efficiency, and ensures the reasonable advancement of the construction period. Due to the accuracy of the selected lifting machinery, the emission of harmful gases is effectively reduced, energy conservation and environmental protection are achieved, better economic benefits are generated, green and civilized construction is promoted, and a better social impact is produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall schematic diagram of the present invention.

[0026] Among them, 1- winch, 2- cast-in-place box girder, 3- support system, 4- square timber, 5- Bailey beam, 6- channel steel, 7- I-beam, 8- fixed pulley. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0030] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0031] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] To achieve the above purpose, Figure 1 As shown, the present invention provides a Bailey beam support system dismantling construction method, comprising the following steps:

[0033] Step S1, pre-embedded point calibration: First, before construction, the surveyor measures and lays out the steel column support system 3 in situ vertically to calibrate the position of the pre-embedded point;

[0034] Step S2, pre-embed channel steel: during the pouring process, at each pre-embedded point, two 20# channel steels 6 are pre-embedded vertically and symmetrically along the bridge direction;

[0035] Step S3, fixed pulley installation: cut 8 equal-length I30b I-beams with a length of 4.5m, double-jointly weld them to form four pairs, and install the fixed pulley 8 at a distance of 0.2m from the end of the double-joint I-beam using a latching process;

[0036] Step S4, hoisting machine in place: using a crane to hoist 4 hoists 1 equipped with YZR type motors and put them in place behind the hoists, respectively placed behind the embedded points, the wire rope on the drum passes through the inside of the double-piece I-beam, passes out along the fixed pulley, and is finally fixed on the Bailey beam;

[0037] Step S5, constructing and fixing the transmission system: embed the double-jointed I-beam steel 7 with the fixed pulley horizontally into the pre-buried channel steel 6, and fix them by welding using a cross fixing method;

[0038] Step S6, construction area division:

[0039] According to the distance of Bailey beam, the transmission system is divided into three areas from near to far: Area 1 mainly includes three rows of Bailey beams on the right; Area 2 mainly includes three rows of Bailey beams in the middle; Area 3 mainly includes three rows of Bailey beams on the left;

[0040] The Bailey beam in area No. 1 is dismantled by winches No. 1 and No. 4; the Bailey beam in area No. 2 is dismantled by traction mode with winches No. 1 and No. 4 as the main and winches No. 2 and No. 3 as the auxiliary; the Bailey beam in area No. 3 is dismantled jointly by winches No. 1, 2, 3 and 4.

[0041] The present invention changes the direction of force through the fixed pulley, and moves the Bailey beam that does not meet the conditions for hoisting to the hoisting range on the support system, which greatly reduces the difficulty and safety risks of traditional Bailey beam hoisting, makes the load borne by the hoisting equipment controllable, can accurately determine the type of hoisting machinery, reduce the cost of large hoisting machinery, has low requirements for the construction site, improves construction efficiency, speeds up the construction progress, and produces good economic benefits. Through the pre-embedded point calibration; pre-embedded channel steel, set a 20mm high and 1:3 slope slope at the pre-embedded channel steel, which is convenient for later cutting, bridge deck leveling, and bridge deck auxiliary construction such as waterproof layer and protective layer; fixed pulley installation; winch in place; cross fixing method is used for welding and fixing, and the transmission system is more solid; construction area division; the traction force at both ends acts on the Bailey beam synchronously through the fixed pulley, providing the same drum operation parameters, and completing the Bailey beam's lateral movement operation more stably and effectively, and realizing safety visualization.

[0042] When dismantling area No. 1, No. 1 and No. 4 winches 1 are operated simultaneously. The winches are divided into three levels: low speed, medium speed and high speed. Through the classification from low to high, the drum is controlled to operate continuously at a uniform speed. A special person is responsible for monitoring the dismantling posture of the Bailey beam 5 in area No. 1 and reporting in time. Since the wire ropes on the drums of No. 1 and No. 4 winches evenly apply traction force through the corresponding fixed pulleys 8, the wire rope in the drum must not be less than 4 turns during the traction operation, and the traction force acts on the lower Bailey beam from both sides simultaneously. Generally, after the drum has been running for 8 to 10 seconds, the lower Bailey beam becomes loose. At this time, the output power of the motor is adjusted to increase the operating speed of the drum. Generally, the towing speed is maintained at 1.5m / min. The lateral movement operation of the Bailey beam is completed faster, more stably and more effectively, and safety visualization is realized. When the Bailey beam moves to the outside of the lateral distribution beam 11, it is unloaded with the cooperation of relevant machinery.

[0043] Dismantling of area No. 2: Considering that the dragging distance of area No. 2 is long, winches No. 1 and No. 4 are operated to provide traction and simultaneously act on the Bailey beam through the fixed pulleys on both sides to complete this dismantling; if there are difficulties in dismantling, winches No. 2 and No. 3 are added as auxiliary equipment on the basis of the traction provided by winches No. 1 and No. 4, and the traction is synchronously transmitted to the Bailey beam in area No. 2. During the traction operation, the wire rope in the drum shall not be less than 4 turns, and the traction acts on the Bailey beam below from both sides; generally, after the drum has been running for 8 to 10 seconds, the Bailey beam below becomes loose. At this time, the output power of the motor is adjusted and the running speed of the drum is increased. Generally, the dragging speed is maintained at 1.5m / min; the lateral movement operation of the Bailey beam is completed faster, more stably and more effectively, and safety visualization is realized. When the Bailey beam moves to the outside of the lateral distribution beam 11, it is unloaded with the cooperation of relevant machinery.

[0044] Dismantling of area No. 3: Taking into account the long towing distance, in order to stabilize the dismantling posture of the Bailey beam, 4 winches are used at the same time. Winches No. 1, 2, 3 and 4 1 act synchronously on the Bailey beam in area No. 3. During the traction operation, the wire rope in the drum must not be less than 4 turns, and the traction force acts synchronously on the Bailey beam below from both sides; generally, after the drum has been running for 8 to 10 seconds, the Bailey beam below becomes loose. At this time, the output power of the motor is adjusted and the running speed of the drum is increased. Generally, the towing speed is maintained at 1.5m / min; the lateral movement operation of the Bailey beam is completed faster, more stably and more effectively, and safety visualization is realized. When the Bailey beam moves to the outside of the lateral distribution beam 11, it is unloaded with the cooperation of relevant machinery.

[0045] To further optimize the technical solution, in step S1, firstly, the in-situ vertical measurement and layout are performed according to the steel column support system 3. The distances from the beam ends along the bridge direction are 3.2m, 11.55m, 20.45m, and 28.8m respectively; the distances from the curb in the transverse direction of the bridge are measured 3m inwards to determine four pre-embedded points; the pre-embedded points are all located on the side webs of the cast-in-place box girder. During the pouring process, at each pre-embedded point, two 20# channel steels are pre-embedded vertically and symmetrically along the bridge direction, with a spacing of 25.6cm, a double I30b I-beam width, a pre-embedded depth of 0.5m, and an exposed length of 1m.

[0046] The present invention provides a method for dismantling and moving a Bailey beam support system. By dismantling and moving the Bailey beam in different areas during the construction project, the span part is slowly moved horizontally to a position convenient for lifting, and then the Bailey beam is dismantled in coordination with relevant machinery. This method can not only release a large amount of labor, reduce construction costs, effectively shorten the construction period, solve the problem that the support system has high requirements for the on-site construction site, but also improve the economic benefits of the enterprise, promote green construction, and realize on-site safety visualization. By adjusting the operating parameters of the winch, the drum wire rope can synchronously apply traction to the Bailey beam to be towed with the help of the correct guidance of the fixed pulley, which can not only realize the horizontal movement of the Bailey beam that does not meet the lifting conditions on the support system to within the lifting range, but also greatly reduce the difficulty and safety risks of the traditional Bailey beam lifting, and the safety, stability and controllability are high. Moreover, the load bearing of the lifting equipment can be effectively controlled, the model of the lifting machinery can be accurately determined, and the cost of large-scale lifting machinery can be reduced. The construction method is convenient, has strong applicability, has low requirements for the construction site, improves construction efficiency, and ensures the reasonable advancement of the construction period. Due to the accuracy of the selected lifting machinery, the emission of harmful gases is effectively reduced, energy conservation and environmental protection are achieved, better economic benefits are generated, green and civilized construction is promoted, and a better social impact is produced.

[0047] The invention is applicable to the dismantling construction of cast-in-place beam support systems in high-speed railways, intercity railways, passenger-freight railways, railway dedicated lines, municipal engineering, highway engineering, etc., and by utilizing the principle of the patent and through appropriate technical improvements, it can adapt to the Bailey beam dismantling construction in more complex construction sites. The use of this construction method solves the problems of the conventional Bailey beam dismantling method, such as the difficulty of operation; the uncontrollable safety and stability of the hoisting machinery; the high cost of mechanical equipment; the wide occupation of the work site; the low dismantling efficiency; and the long dismantling period.

[0048] Example

[0049] In a railway project of a certain section, the starting and ending mileage of the main line is DK28+117.17 to DK38+857.07, which includes 2 double-track box girder bridges and 5-hole cast-in-place simply supported box girders. Taking the dismantling of a single-side Bailey beam with a cast-in-place box girder length of 32.6m as an example, the project adopts the construction method provided by the present invention.

[0050] The Bailey beam removal construction method provided in this implementation case includes the following steps performed in sequence:

[0051] Calibration of embedded points. Before construction, surveyors measured and laid out the steel column support system 3 vertically in situ. The distances along the bridge were 3.2m, 11.55m, 20.45m, and 28.8m from the beam ends. The distances across the bridge were 3m inward from the curbstones. Four embedded points were calibrated.

[0052] Embedded channel steel. The four embedded points are all located at the side webs of the cast-in-place box girder. During the pouring process, at each embedded point, two 20# channel steels 6 are embedded vertically and symmetrically along the bridge direction, with a spacing of 25.6cm and a double I30b I-beam width, an embedded depth of 0.5m, and an exposed length of 1m; and a water collection slope with a height of 20mm and a slope ratio of 1:3 is set at the embedded channel steel to facilitate later cutting, bridge deck leveling, and bridge deck auxiliary construction such as waterproof layer and protective layer;

[0053] Fixed pulley installation. Cut 8 equal length I30b I-beams to a length of 4.5m, weld them in double to form four pairs, and install the fixed pulley 8 at a distance of 0.2m from the end of the I-beam using the latching process;

[0054] The winches are in place. Four winches equipped with YZR motors are hoisted by crane and placed behind the embedded points to provide stable power for the uniform removal of the Bailey beam. The steel wire rope on the drum passes through the double-jointed I-beam, passes through the fixed pulley, and is finally fixed on the Bailey beam.

[0055] Conveying system construction and fixation. The double I-beams 7 with the fixed pulley fixed are horizontally embedded in the embedded channel steel, with the fixed pulley side end extending 1.5m outside the bridge deck. The tail is welded and fixed by the cross fixing method using the remaining channel steel. A 10*10 square wood 4 is placed under the I-beam to protect the bridge deck and act as a buffer during operation. Finally, the tail of the I-beam is fixed with the channel steel;

[0056] Construction area division.

[0057] According to the distance of Bailey beam, the transmission system is divided into three areas from near to far. Area 1 mainly includes three rows of Bailey beams on the right; Area 2 mainly includes three rows of Bailey beams in the middle; Area 3 mainly includes three rows of Bailey beams on the left.

[0058] The Bailey beams in area No. 1 are dismantled by winches No. 1 and No. 4; the Bailey beams in area No. 2 are dismantled by traction using winches No. 1 and No. 4 as the main and winches No. 2 and No. 3 as the auxiliary; the Bailey beams in area No. 3 are dismantled jointly by winches No. 1, No. 2, No. 3 and No. 4.

[0059] The Bailey beam was removed.

[0060] When removing the No. 1 area, the No. 1 and No. 4 winches 1 are operated simultaneously. The winches are divided into three levels: low speed, medium speed, and high speed. Professionals control the drum to operate continuously at a uniform speed through the classification from low to high. A special person is responsible for monitoring the disassembly posture of the Bailey beam 5 in the No. 1 area and reporting it in time. Since the wire ropes on the No. 1 and No. 4 drums evenly apply traction through the corresponding fixed pulleys 8, the wire ropes in the drums must not be less than 4 turns during the traction operation, and the traction force acts on the lower Bailey beam from both sides simultaneously. Generally, after the drum runs for 8 to 10 seconds, the lower Bailey beam becomes loose. At this time, the output power of the motor is adjusted to increase the running speed of the drum. Generally, the dragging speed is maintained at 1.5m / min. The lateral movement operation of the Bailey beam is completed faster, more stable and more effectively, and safety visualization is realized. When the Bailey beam moves to the outside of the lateral distribution beam 11, it is unloaded with relevant machinery.

[0061] Dismantle and move the No. 2 area. Considering that the towing distance of the No. 2 area is long, the No. 1 and No. 4 winches 1 are operated to provide traction while acting on the Bailey beam through the fixed pulleys on both sides to complete this dismantling. If the actual dismantling is difficult, it can be considered to add No. 2 and No. 3 winches as auxiliary equipment on the basis of the traction provided by the No. 1 and No. 4 winches, and synchronously transmit the traction to the Bailey beam in the No. 2 area, and the dismantling method is the same as above.

[0062] Dismantle area No. 3. Considering the long towing distance, in order to stabilize the dismantling posture of the Bailey beam, 4 traction equipments are used at the same time, and the No. 1, No. 2, No. 3, and No. 4 winches 1 act on the Bailey beam in area No. 3 synchronously to complete the dismantling of the Bailey beam. The dismantling method is the same as above.

[0063] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A Bailey beam support system dismantling construction method, characterized in that: The steps include: Step S1, pre-embedded point calibration: first, before construction, vertical measurement and layout are performed in situ according to the steel column support system (3) to calibrate the position of the pre-embedded point; Step S2, pre-embed channel steel: during the pouring process, at each pre-embedded point, two channel steels (6) are pre-embedded vertically and symmetrically arranged along the bridge direction; Step S3, fixed pulley installation: install a fixed pulley (8) at a distance of 0.2 m from the end of the double-jointed I-beam; Step S4, hoisting the winch in place: hoisting four hoists (1) and placing them in place behind the winches; Step S5, constructing and fixing the transmission system: embed the double-jointed I-beam (7) with the fixed pulley horizontally into the pre-buried channel steel (6) and fix them by welding using a cross fixing method; Step S6, construction area division: According to the distance of Bailey beam, the transmission system is divided into three areas from near to far: Area 1 mainly includes three rows of Bailey beams on the right; Area 2 mainly includes three rows of Bailey beams in the middle; Area 3 mainly includes three rows of Bailey beams on the left; The Bailey beam in area No. 1 is dismantled by winches No. 1 and No. 4; the Bailey beam in area No. 2 is dismantled by traction mode with winches No. 1 and No. 4 as the main and winches No. 2 and No. 3 as the auxiliary; the Bailey beam in area No. 3 is dismantled jointly by winches No. 1, 2, 3 and 4.

2. A Bailey beam support system dismantling construction method as claimed in claim 1, characterized in that: When removing the No. 1 area, the No. 1 and No. 4 winches (1) are operated simultaneously. The winches are divided into three levels: low speed, medium speed and high speed. By grading from low to high, the drum is controlled to operate continuously at a uniform speed. A special person is assigned to monitor the disassembly posture of the Bailey beam (5) in the No. 1 area and report it in time. Since the steel wire ropes on the drums of the No. 1 and No. 4 winches evenly apply traction force through the corresponding fixed pulleys (8), the steel wire ropes in the drums must not be less than 4 turns during the traction operation, and the traction force acts on the Bailey beam below from both sides simultaneously. Generally, after the drum has been running for 8 to 10 seconds, the Bailey beam below becomes loose. At this time, the output power of the motor is adjusted, the operation speed of the drum is increased, and the dragging speed is maintained at 1.5m / min. The lateral movement operation of the Bailey beam is completed and safety visualization is realized. After the Bailey beam moves to the outside of the lateral distribution beam (11), it is removed.

3. A Bailey beam support system dismantling construction method as claimed in claim 1, characterized in that: Removal of area No. 2: Considering that the towing distance of area No. 2 is long, winches No. 1 and No. 4 (1) are operated to provide traction and simultaneously act on the Bailey beam through the fixed pulleys on both sides to complete the removal. If the removal is difficult, winches No. 2 and No. 3 are added as auxiliary equipment on the basis of the traction provided by winches No. 1 and No. 4, and the traction is synchronously transmitted to the Bailey beam in area No.

2. During the traction operation, the wire rope in the drum shall not be less than 4 turns, and the traction is synchronously acted on the Bailey beam below from both sides. Generally, after the drum has been running for 8 to 10 seconds, the Bailey beam below becomes loose. At this time, the output power of the motor is adjusted, the running speed of the drum is increased, and the towing speed is maintained at 1.5 m / min. The lateral movement operation of the Bailey beam is completed and safety visualization is realized. After the Bailey beam moves to the outside of the lateral distribution beam (11), it is removed.

4. A Bailey beam support system dismantling construction method as claimed in claim 1, characterized in that: Removal of area No. 3: Considering the long towing distance, in order to stabilize the removal posture of the Bailey beam, four winches are used at the same time. Winches No. 1, No. 2, No. 3 and No. 4 (1) act on the Bailey beam in area No. 3 simultaneously. During the towing operation, the wire rope in the drum must not be less than 4 turns, and the traction force acts on the Bailey beam below from both sides simultaneously. Generally, after the drum has been running for 8 to 10 seconds, the Bailey beam below becomes loose. At this time, the output power of the motor is adjusted, the running speed of the drum is increased, and the towing speed is maintained at 1.5m / min. The lateral movement operation of the Bailey beam is completed and safety visualization is realized. After the Bailey beam moves to the outside of the lateral distribution beam (11), it is removed.

5. A Bailey beam support system dismantling construction method as claimed in claim 4, characterized in that: In step S1, firstly, the in-situ vertical measurement and layout are carried out according to the steel column support system (3). The distances from the beam ends along the bridge direction are 3.2m, 11.55m, 20.45m and 28.8m respectively; the distances from the curb in the transverse direction are measured 3m inwards, and four pre-embedded points are determined; the pre-embedded points are all located at the side webs of the cast-in-place box beam. During the pouring process, at each pre-embedded point, two 20# channel steels are pre-embedded vertically and symmetrically along the bridge direction, with a spacing of 25.6cm, an embedded depth of 0.5m and an exposed length of 1m.

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