Overall bailey beam falling and dismantling method for inclined high-pier bridge

Abstract

The invention discloses a bailey beam overall falling frame dismantling method of an inclined high pier bridge, and relates to the technical field of bridge construction, the method comprises the following steps: reserving a first lifting hole, a first safety hole, a second lifting hole and a second safety hole; center hole jacks and anchorage devices are installed, and all the anchorage devices are connected with the corresponding center hole jacks through steel strands; first nuts and second nuts are arranged, and the first nuts are connected with the corresponding second nuts through deformed steel bars; separating the upper structure from the lower structure; the lower structure is dismantled; mounting a measuring point and a displacement measuring instrument; each displacement measuring instrument is used for acquiring a distance value between the displacement measuring instrument and the corresponding measuring point; the upper structure is connected with a limiting device; synchronously driving the corresponding steel strands to descend through a plurality of center penetrating jacks, and synchronously lowering a plurality of deformed steel bars until the upper structure and the limiting device are integrally lowered to the ground; and the upper structure and the limiting device are dismounted on the ground, and the stability and safety of the bailey beam in the overall lowering process can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering, in particular to a method for overall dismantling of a Bailey beam of an inclined high-pier bridge. BACKGROUND

[0002] As a common temporary support structure in the process of bridge construction, the Bailey beam needs to be dismantled after the bridge is formed. In some narrow construction sites or complex terrain areas, the traditional crane hoisting and dismantling operation is difficult, the safety risk of construction is greatly improved, and the overall dismantling method is usually used for dismantling, that is, the lower structure of the Bailey beam is first dismantled, and then the upper structure is lowered as a whole. After the upper structure is lowered to the ground, it is dismantled.

[0003] The existing overall dismantling method of the Bailey beam usually uses threaded steel as a lifting rod. However, when the overall dismantling of the Bailey beam of the inclined high-pier bridge is carried out, due to the high height of the Bailey beam, multiple threaded steels need to be connected by welding or sleeve to form a lifting rod. The joint position of the lifting rod has low structural strength, and it is difficult to ensure the consistency of the forming quality of multiple lifting rods. When multiple lifting rods jointly lift the Bailey beam, uneven stress is easily caused. In addition, due to the inclined arrangement of the Bailey beam, the upper structure of the Bailey beam is easily offset or inclined during the lowering process due to different force angles, which not only increases the safety hazard in the dismantling process, but also may cause local damage to the Bailey beam structure, affecting its subsequent recycling and reuse. SUMMARY

[0004] The main purpose of the present application is to provide a method for overall dismantling of the Bailey beam of the inclined high-pier bridge, which aims to solve the technical problem that the overall dismantling of the Bailey beam of the inclined bridge in the prior art is prone to uneven stress, which leads to offset or inclination.

[0005] To achieve the above object, the method for removing the whole Bailey beam of an inclined high-pier bridge comprises the following steps: reserving a plurality of first lifting holes and a plurality of first safety holes on the bridge, reserving a plurality of second lifting holes and a plurality of second safety holes on the upper structure of the Bailey beam, the first lifting holes and the second lifting holes are arranged one by one in correspondence, and the first safety holes and the second safety holes are arranged one by one in correspondence; installing a through jack at the position corresponding to each first lifting hole on the top of the bridge, arranging an anchor device at the position corresponding to each second lifting hole on the bottom of the upper structure, connecting each anchor device with the corresponding through jack through a steel strand, and the steel strand is sequentially arranged in the corresponding first lifting hole and second lifting hole; arranging a first nut at the position corresponding to each first safety hole on the top of the bridge, arranging a second nut at the position corresponding to each second safety hole on the bottom of the upper structure, connecting each first nut with the corresponding second nut through a threaded steel, and the threaded steel is sequentially arranged in the corresponding first safety hole and second safety hole; removing the connection between the upper structure and the lower structure of the Bailey beam, so that the upper structure and the lower structure are separated; removing the lower structure; installing a measuring point at the position corresponding to each through jack on the bottom of the upper structure, and installing a displacement measuring instrument on the ground corresponding to each measuring point; each displacement measuring instrument is used to obtain the distance value of the corresponding measuring point; each through jack drives the steel strand to descend according to the corresponding distance value, and synchronously lowers each threaded steel, until the upper structure rotates from the inclined state to the horizontal state; connecting a limiting device on the bottom of the upper structure; synchronously driving the corresponding steel strand to descend through a plurality of through jacks, and synchronously lowering a plurality of threaded steels, until the upper structure and the limiting device are integrally lowered to the ground; removing the upper structure and the limiting device on the ground.

[0006] In an embodiment, the step that each through jack drives the steel strand to descend according to the corresponding distance value, and synchronously lowers each threaded steel, until the upper structure rotates from the inclined state to the horizontal state, comprises: measuring the distance value between each displacement measuring instrument and the corresponding measuring point through each displacement measuring instrument, to obtain the relative elevation of each measuring point; obtaining the ground elevation of each displacement measuring instrument according to the terrain of the ground; calculating the adjusted elevation of each measuring point according to the relative elevation and the ground elevation; driving the corresponding steel strand to descend through each through jack, and synchronously lowering each threaded steel, so that the upper structure is lowered to the adjusted elevation.

[0007] In an embodiment, the step of lowering the superstructure to the adjusted elevation by driving the steel strands down through the respective jacks simultaneously comprises: loosening the first nuts; driving the steel strands down through the respective jacks until the superstructure is lowered to the adjusted elevation; and tightening the first nuts.

[0008] In an embodiment, the jack comprises an upper clamp, a lower clamp and a hydraulic cylinder, and the step of lowering the superstructure to the adjusted elevation by driving the steel strands down through the respective jacks comprises: keeping the upper clamp of the jack clamped on the steel strand, and loosening the lower clamp; driving the upper clamp of the jack to move towards the lower clamp by the hydraulic cylinder, so as to lower the steel strand; keeping the lower clamp clamped on the steel strand, and loosening the upper clamp; driving the upper clamp of the jack to move away from the lower clamp by the hydraulic cylinder; and repeating the above steps until the superstructure is lowered to the adjusted elevation.

[0009] In an embodiment, the step of lowering the superstructure and the limiting device to the ground as a whole by driving the steel strands down through the respective jacks simultaneously comprises: lowering the superstructure and the limiting device to the ground as a whole by driving the steel strands down through the respective jacks simultaneously; lowering the steel strands through the respective jacks to keep the relative elevations of the measuring points consistent, so as to keep the superstructure parallel to the ground; and lowering the superstructure and the limiting device to the ground as a whole by driving the steel strands down through the respective jacks simultaneously.

[0010] In an embodiment, the superstructure comprises a plurality of spaced-apart bearers, and the step of connecting the limiting device to the superstructure comprises: welding two first channel steels to two sides of the superstructure respectively; welding a second channel steel between the two first channel steels, and welding the second channel steel to the bearers to form the limiting device.

[0011] In an embodiment, the step of connecting an upper cushion beam at a position corresponding to each of the first lifting holes on the top of the bridge comprises: placing two rows of I-shaped steel side by side at intervals, forming an installation gap between the two rows of I-shaped steel; welding a steel plate on the top and bottom of the two rows of I-shaped steel respectively; opening two through holes on the two steel plates respectively, such that the two through holes are arranged vertically opposite to each other, and each of the through holes is connected to the installation gap, forming the upper cushion beam; and welding the upper cushion beam to the top of the bridge, such that each of the through holes is arranged vertically opposite to the first lifting hole.

[0012] In an embodiment, the step of connecting an upper cushion beam at a position corresponding to each of the first lifting holes on the top of the bridge comprises: placing two rows of I-shaped steel side by side at intervals, forming an installation gap between the two rows of I-shaped steel; welding a steel plate on the top and bottom of the two rows of I-shaped steel respectively; opening two through holes on the two steel plates respectively, such that the two through holes are arranged vertically opposite to each other, and each of the through holes is connected to the installation gap, forming the upper cushion beam; and welding the upper cushion beam to the top of the bridge, such that each of the through holes is arranged vertically opposite to the first lifting hole.

[0013] In an embodiment, the lower structure comprises a plurality of pipe piles and tie beams connected between any two adjacent pipe piles, and the step of demolishing the lower structure comprises: removing the connecting bolts between the pipe piles and the tie beams connected thereto; using a crane to lift away each of the tie beams; binding a lifting belt at a position one-third of the way down the top of the pipe pile; removing the column foot bolts connecting the bottom of the pipe pile to the ground; using a crane to lift the pipe pile by the lifting belt to lay down the pipe pile; and repeating the above steps until all of the pipe piles and the tie beams are removed.

[0014] In an embodiment, the number of the first lifting holes and the second lifting holes is four, and the four first lifting holes and the four second lifting holes are arranged at the four corners of the bridge, and the number of the first safety holes and the second safety holes is four, and the four first safety holes are arranged close to the four first lifting holes respectively, and the four second safety holes are arranged close to the four second lifting holes respectively.

[0015] The method for integrally demolishing the Bailey beam of the inclined high-pier bridge provided by the application comprises the following steps: when the Bailey beam of the inclined high-pier bridge is demolished, a plurality of through-hole jacks are arranged on the bridge, the through-hole jacks are supported by the built bridge, the through-hole jacks are connected with the upper structure of the Bailey beam through steel strands, and the upper structure is integrally lowered by synchronously driving the steel strands to descend by the plurality of through-hole jacks. The steel strands are used as the lifting appliance of the upper structure of the Bailey beam, when the upper structure of the Bailey beam is lifted by the plurality of steel strands, the steel strands are automatically adjusted according to the force difference of each lifting point by the self-locking function of the anchor provided in the through-hole jack, the horizontal component of the inclined Bailey beam is adaptively compensated, the force of each steel strand is consistent, and therefore the force of the upper structure of the Bailey beam is uniform. The inclination degree of the upper structure in the lowering process is obtained in real time by arranging measuring points at the bottom of the upper structure, arranging a displacement measuring instrument on the ground to obtain the distance values between the corresponding measuring points and the measuring instrument, and adjusting the displacement of the corresponding steel strands driven by the plurality of through-hole jacks, and the lowering angle of the upper structure is adjusted. After the upper structure in the inclined state is adjusted to the horizontal state, the upper structure is integrally lowered, which is beneficial to uniform force of the upper structure in the lowering process, thereby preventing the upper structure from being inclined or deviated. After the upper structure is adjusted to the horizontal state, the limiting device is connected to the upper structure, the limiting device and the upper structure are more stably connected, the stability of the upper structure in the integrally lowering process is further improved, the stable erection of the upper structure is ensured, and the safety in the process of demolishing the Bailey beam is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in the drawings without any creative effort.

[0017] Figure 1 The flowchart of the embodiment of the method for integrally demolishing the Bailey beam of the inclined high-pier bridge provided by the present application is shown in the figure.

[0018] Figure 2 The structural diagram of the embodiment of the bridge and the Bailey beam provided by the present application is shown in the figure.

[0019] Figure 3 The local structural diagram of the embodiment of the Bailey beam provided by the present application is shown in the figure.

[0020] Explanation of reference signs:

[0021] 10, bridge; 11, first lifting hole; 12, first safety hole; 20, Bailey beam; 21, superstructure; 22, substructure; 23, second lifting hole; 24, second safety hole; 30, steel strand; 31, anchorage device; 32, centering jack; 40, threaded steel; 41, first nut; 42, second nut; 50, Bailey piece; 51, first channel steel; 52, second channel steel.

[0022] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0024] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0025] In addition, if the embodiments of the present application involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the person skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the present application.

[0026] The existing whole frame dismantling method of the Bailey beam usually uses threaded steel as a lifting rod, however, when the whole frame of the Bailey beam of the inclined high pier bridge is dismantled, since the height of the Bailey beam is high, multiple threaded steels are connected by welding or sleeve to form a lifting rod, the joint position of the lifting rod has low structural strength, and it is difficult to ensure the consistency of the forming quality of multiple lifting rods, and uneven stress is easily caused when multiple lifting rods jointly lift the Bailey beam. In addition, since the Bailey beam is arranged in an inclined manner, the upper structure of the Bailey beam is easily deviated or inclined due to different force angles in the lowering process, which not only increases the safety hazard in the dismantling process, but also may cause local damage of the Bailey beam structure, affecting the subsequent recycling and reuse.

[0027] The present application provides a whole frame dismantling method of the Bailey beam of the inclined high pier bridge, comprising the steps of:

[0028] S10: reserving multiple first lifting holes and multiple first safety holes on the bridge, and reserving multiple second lifting holes and multiple second safety holes on the upper structure of the Bailey beam; the multiple first lifting holes and the multiple second lifting holes are arranged one by one in correspondence, and the multiple first safety holes and the multiple second safety holes are arranged one by one in correspondence;

[0029] Please refer to Figure 1 and Figure 2 , the bridge 10 is a concrete structure, the positions of the first lifting holes 11 and the first safety holes 12 are reserved during the pouring process of the bridge 10, so that the multiple first lifting holes 11 and the multiple first safety holes 12 are formed together with the bridge 10, each first lifting hole 11 and each first safety hole 12 penetrate the bridge 10 along the vertical direction, and each first lifting hole 11 and each first safety hole 12 are arranged at intervals. The Bailey beam 20 is a steel structure, the upper structure 21 of the Bailey beam 20 is formed with multiple second lifting holes 23 and multiple second safety holes 24, each first lifting hole 11 and each second lifting hole 23 are arranged in vertical opposition, which is convenient for the steel strand 30 to pass through, and each first safety hole 12 and each second safety hole 24 are also arranged in vertical opposition, which is convenient for the threaded steel 40 to pass through.

[0030] S20: installing a through jack at the position corresponding to each first lifting hole on the top of the bridge, and arranging an anchor device at the position corresponding to each second lifting hole on the bottom of the upper structure, connecting each anchor device with the corresponding through jack by a steel strand, and the steel strand is sequentially arranged in the corresponding first lifting hole and second lifting hole;

[0031] Each of the through jacks 32 is arranged opposite to a first lifting hole 11 and a second lifting hole 23, and the through jack 32 is located above the first lifting hole 11. Each of the anchorage devices 31 is arranged opposite to a first lifting hole 11 and a second lifting hole 23, and the anchorage device 31 is located below the second lifting hole 23. The through jack 32, the first lifting hole 11, the second lifting hole 23 and the anchorage device 31 are arranged vertically opposite to each other. The steel strand 30 is arranged in the first lifting hole 11 and the second lifting hole 23, and the upper end of the steel strand 30 is connected to the through jack 32. The lower end of the steel strand 30 is fixed to the side of the second lifting hole 23 away from the first lifting hole 11 through the anchorage device 31. The bridge 10 provides support for the through jack 32. The through jack 32 can drive the steel strand 30 to rise or fall, so that the steel strand 30 drives the superstructure 21 to rise or fall through the anchorage device 31.

[0032] S30: A first nut is arranged at a position corresponding to each of the first safety holes at the top of the bridge, and a second nut is arranged at a position corresponding to each of the second safety holes at the bottom of the superstructure. A threaded steel bar is connected to each of the first nut and the corresponding second nut. The threaded steel bar is arranged in the corresponding first safety hole and the second safety hole in sequence.

[0033] Similarly, each of the first nut 41 and the second nut 42 is arranged correspondingly. The first nut 41 is arranged above the first safety hole 12, and the second nut 42 is arranged below the second safety hole 24. The threaded steel bar 40 is arranged in the first safety hole 12 and the second safety hole 24, and the two ends of the threaded steel bar 40 are threadedly connected to the first nut 41 and the second nut 42, respectively. Thus, the threaded steel bar 40 is fastened between the bridge 10 and the superstructure 21 through the first nut 41 and the second nut 42, so that the bridge 10 and the superstructure 21 are fixed through the cooperation of the threaded steel bar 40, the first nut 41 and the second nut 42. The threaded steel bar 40, the first nut 41 and the second nut 42 serve as safety measures during the removal of the Bailey beam 20, which can prevent the superstructure 21 from falling when the steel strand 30 fails, thereby ensuring safety during the removal process.

[0034] S40: The connection between the superstructure and the substructure of the Bailey beam is removed, so that the superstructure and the substructure are separated.

[0035] Specifically, the bailey beam 20 includes an upper structure 21 and a lower structure 22, after the upper structure 21 is fixedly connected with the bridge 10 through the steel strand 30 and the threaded steel 40, the connection between the upper structure 21 and the lower structure 22 is removed, the upper structure 21 is slightly lifted by driving the steel strand 30 through the through-hole jack 32, the sand box at the bottom of the upper structure 21 is removed to reserve a certain operation space, and then the sand boxes are removed from both ends to the middle in sequence, so that the upper structure 21 is completely hung under the bridge 10 through the steel strand 30 and the threaded steel 40, and the subsequent separation and removal of the upper structure 21 and the lower structure 22 is facilitated.

[0036] S50: removing the lower structure;

[0037] After the upper structure 21 is fixedly connected with the bridge 10, the lower structure 22 is preferentially removed, and after the removal of the lower structure 22 is completed, the upper structure 21 can be lowered by using the original space of the lower structure 22, so that the construction land area can be saved.

[0038] S60: installing measuring points at positions corresponding to each through-hole jack at the bottom of the upper structure, and installing displacement measuring instruments at positions corresponding to each measuring point on the ground; each displacement measuring instrument is used to obtain a distance value from the corresponding measuring point;

[0039] It can be explained that each displacement measuring instrument is arranged corresponding to a measuring point, the displacement measuring instrument is arranged on the ground, and the measuring point is arranged at the bottom of the upper structure 21, and the displacement measuring instrument can obtain the distance value between the corresponding measuring point, that is, the height of the measuring point from the ground. The displacement measuring instrument can adopt a device such as a laser measuring instrument in the prior art, which is not limited here.

[0040] S70: each through-hole jack drives the steel strand to descend according to the corresponding distance value, and synchronously lowers each threaded steel, until the upper structure is rotated from the inclined state to the horizontal state;

[0041] It should be noted that since the bridge 10 is arranged in an inclined manner, the upper structure 21 is used to provide support for the bridge 10 during the construction of the bridge 10, and the upper structure 21 is fixedly connected with the bridge 10, so the upper structure 21 is also in an inclined state. A plurality of measuring points are arranged at different positions on the upper structure 21, the heights of the plurality of measuring points obtained by the plurality of displacement measuring instruments are combined with the slope of the ground, and the specific inclination angle of the upper structure 21 can be obtained, so that the height required to adjust each measuring point position when the upper structure 21 is rotated from the inclined state to the horizontal state can be calculated, each measuring point is arranged corresponding to a through-hole jack 32, and the height of each measuring point position of the upper structure 21 can be adjusted by driving the steel strand 30 to rise or descend through the corresponding through-hole jack 32, so that the upper structure 21 can be kept in a horizontal state, and the subsequent overall lowering of the upper structure 21 is facilitated.

[0042] S80: connecting the limiting device on the upper structure;

[0043] By connecting the limiting device on the upper structure 21 in a horizontal state, the limiting device can limit the displacement of the upper structure 21 in other directions and angles during the lowering process of the upper structure 21, prevent the upper structure 21 from deviating, and further ensure the stability during the demolition process.

[0044] S90: synchronously drive the corresponding steel strands to descend by multiple through-hole jacks, and synchronously lower the multiple threaded steels until the upper structure and the limiting device are lowered to the ground as a whole;

[0045] By synchronously driving the corresponding steel strands 30 to descend by multiple through-hole jacks 32, the upper structure 21 and the limiting device can remain horizontal during the lowering process, ensuring that the upper structure 21 is uniformly stressed during the lowering process. The threaded steels 40 are synchronously lowered with the lowering of the upper structure 21, so that the threaded steels 40 continuously provide safety protection during the lowering process of the upper structure 21, and through the cooperation of the threaded steels 40 with the first safety hole 12 and the second safety hole 24, the threaded steels 40 can provide a certain guiding effect for the lowering of the upper structure 21.

[0046] S100: demolish the upper structure and the limiting device on the ground.

[0047] After completing the overall unloading of the upper structure 21 and the limiting device, the upper structure 21 and the limiting device can be demolished on the ground, greatly reducing the safety risk during construction and improving the efficiency of demolition construction. After completing the unloading and demolition of the bailey beam 20 of one bridge 10 section, the next bridge 10 section is transferred, and the above steps are repeated until the unloading and demolition of all bailey beams 20 are completed, so that the bailey beams 20 can be smoothly recycled and reused.

[0048] The method for removing the whole bent of the inclined high-pier bridge by the whole removal of the Bailey beam of the inclined high-pier bridge comprises the following steps: when the Bailey beam 20 of the inclined high-pier bridge 10 is removed, a plurality of through-hole jacks 32 are arranged on the bridge 10, each through-hole jack 32 is supported by the built bridge 10, the through-hole jack 32 is connected with the upper structure 21 of the Bailey beam 20 through the steel strand 30, and the upper structure 21 is synchronously driven to be lowered by the plurality of through-hole jacks 32 and the steel strand 30. The steel strand 30 is used as the lifting appliance of the upper structure 21 of the Bailey beam 20, the steel strand 30 is automatically adjusted according to the force difference of each lifting point and automatically adjusts the cable force through the self-locking function of the anchor 31 in the through-hole jack 32 when the upper structure 21 of the Bailey beam 20 is lifted by the plurality of steel strands 30, the horizontal component of the inclined Bailey beam 20 is adaptively compensated, the force of each steel strand 30 is consistent, and therefore the force of the upper structure 21 of the Bailey beam 20 is uniform. The displacement measuring instrument is arranged on the ground to obtain the distance value between each corresponding measuring point and the measuring instrument, the inclination degree of the upper structure 21 in the lowering process is obtained in real time by obtaining a plurality of distance values of a plurality of measuring points at different positions, the displacement of the corresponding steel strand 30 driven by the plurality of through-hole jacks 32 is adjusted, and the lowering angle of the upper structure 21 is adjusted. After the upper structure 21 in the inclined state is adjusted to the horizontal state, the upper structure 21 is lowered as a whole, which is beneficial to uniform force of the upper structure 21 in the lowering process, thereby preventing the upper structure 21 from being inclined or deviated. After the upper structure 21 is adjusted to the horizontal state, the limiting device is connected to the upper structure 21, the limiting device and the upper structure 21 are more stably connected, the stability of the upper structure 21 in the whole lowering process is further improved, the stable removal of the upper structure 21 is ensured, and the safety in the removal process of the Bailey beam 20 is improved.

[0049] In an embodiment, step S70 comprises:

[0050] S71: measuring the distance value between each displacement measuring instrument and the corresponding measuring point to obtain the relative elevation of each measuring point;

[0051] S72: obtaining the ground elevation of each displacement measuring instrument according to the terrain of the ground;

[0052] S73: calculating the adjustment elevation of each measuring point according to the relative elevation and the ground elevation;

[0053] S74: driving the corresponding steel strand to be lowered by each through-hole jack, and synchronously lowering each threaded steel to lower the upper structure to the adjustment elevation.

[0054] It can be explained that firstly, the distance value between the position of each displacement measuring instrument and the corresponding measuring point installed at the bottom of the superstructure 21 is measured in real time, which directly reflects the relative elevation of the measuring point relative to the installation position of the displacement measuring instrument below; then, according to the actual terrain of the bridge 10 unloading area ground, the ground elevation of each displacement measuring instrument installation point is accurately determined by measuring means; then, by algebraically adding the relative elevation of each measuring point to the ground elevation of the displacement measuring instrument below, the adjustment elevation of each measuring point is calculated, which is the target height required to ensure that the superstructure 21 reaches the predetermined level at the measuring point position; finally, based on the adjustment elevation of each measuring point calculated, the corresponding steel strand 30 is driven by controlling each through jack 32 to perform precise descending displacement, and each threaded steel 40 is lowered synchronously by artificial or mechanical means to release its bearing effect, so that the superstructure 21 gradually descends until the actual position of all measuring points reaches the adjustment elevation calculated respectively, thereby accurately controlling the superstructure 21 to smoothly and controllably rotate from the inclined state to the horizontal state.

[0055] In an embodiment, step S74 comprises:

[0056] S741: Loosen each of the first nuts;

[0057] S742: Drive the corresponding steel strand to descend by each of the through jacks until the position of the superstructure corresponding to the through jack descends to the adjustment elevation;

[0058] S743: Tighten the first nuts.

[0059] It can be understood that loosening each first nut 41 releases the rigid constraint of the threaded steel 40 on the superstructure 21, so that the weight of the superstructure 21 is completely transferred to the steel strand 30; then, by independently driving the corresponding steel strand 30 to descend accurately by each through jack 32, the adjustment elevation of each measuring point calculated in the foregoing step is controlled to ensure that the superstructure 21 synchronously descends to the target height at the position corresponding to the through jack 32; finally, after confirming that all measuring points reach the adjustment elevation, tighten each first nut 41 to make the threaded steel 40 re-tension and bear part of the load, forming a double insurance mechanism of collaborative force of the steel strand 30.

[0060] In an embodiment, the through jack 32 comprises an upper clamp, a lower clamp and a cylinder, and step S742 comprises:

[0061] S7421: Keep the upper clamp of the through jack clamping the steel strand, and the lower clamp relaxing;

[0062] S7422: the oil cylinder drives the upper clamp to move towards the direction of approaching the lower clamp, so as to make the steel strand descend;

[0063] S7423: keep the lower clamp clamping the steel strand, and the upper clamp is released;

[0064] S7424: the oil cylinder drives the upper clamp to move away from the lower clamp;

[0065] S7425: repeat the above steps until the upper structure corresponding to the position of the through jack is lowered to the adjustment elevation.

[0066] It can be explained that the through jack 32 is driven by the oil cylinder, and when the steel strand 30 is driven by the through jack 32, first, the upper clamp of the through jack 32 is kept in the state of clamping the steel strand 30, and the lower clamp is released, so that the load of the steel strand 30 is completely borne by the upper clamp; then the oil cylinder drives the upper clamp to move towards the direction of approaching the lower clamp, and drives the clamped steel strand 30 to descend synchronously, so as to realize the micro displacement of the corresponding position of the upper structure 21; then the lower clamp clamps the steel strand 30 to lock the current descending displacement, and the upper clamp is released to release the clamping effect; then the oil cylinder drives the upper clamp to extend away from the lower clamp, so as to prepare for the next descending cycle; repeat the above-mentioned clamping alternation and the extension and contraction of the oil cylinder, until the cumulative descent through multiple cycles makes the upper structure 21 accurately reach the adjustment elevation at the position corresponding to the through jack 32.

[0067] In an embodiment, step S90 comprises:

[0068] S91: drive the corresponding steel strand to descend by multiple through jacks synchronously, and simultaneously lower multiple threaded steels, until the upper structure and the limiting device are lowered to approach the ground as a whole;

[0069] S92: drive the corresponding steel strand to descend by each through jack, so that the relative elevations of multiple measuring points are kept consistent, so that the upper structure is arranged in parallel with the ground;

[0070] S93: drive the corresponding steel strand to descend by multiple through jacks synchronously, and simultaneously lower multiple threaded steels, until the upper structure and the limiting device are in close contact with the ground.

[0071] It needs to be explained and illustrated that the upper structure 21 remains horizontal during the lowering process, and when the upper structure 21 is arranged inclined on the ground, when the upper structure 21 is lowered horizontally to a position close to the ground, the corresponding steel strand 30 is driven to descend by each through-hole jack 32, so as to adjust the inclined state of the upper structure 21 again, so that the inclined angle of the upper structure 21 is consistent with the inclined angle of the ground, and then the upper structure 21 is continuously lowered, so that the upper structure 21 is attached to the ground in a state parallel to the ground, ensuring that the upper structure 21 lands stably, facilitating the subsequent recovery and reuse of the timber beam 20.

[0072] In an embodiment, the upper structure includes a plurality of spaced timber beams, and step S80 includes:

[0073] S81: two first channel steels are welded on the two sides of the upper structure respectively;

[0074] S82: a second channel steel is welded between the two first channel steels, and the second channel steel is welded with each of the timber beams, forming the limiting device.

[0075] Please refer to Figure 3 , two first channel steels 51 are arranged on the opposite sides of the upper structure 21 respectively, and each first channel steel 51 is welded with the outermost timber beam 50 of the upper structure 21, a second channel steel 52 is connected between the two first channel steels 51, and the second channel steel 52 is perpendicular to each first channel steel 51, and the second channel steel 52 is welded with each timber beam 50 passing through it. After the upper structure 21 remains horizontal, the limiting device is welded on the upper structure 21, which provides two-direction lateral limiting for the upper structure 21 through the two first channel steels 51 and the second channel steel 52, further improves the overall rigidity of the upper structure 21, prevents the upper structure 21 from deviating or losing stability during the lowering process, significantly improves the attitude stability of the upper structure 21, and makes the upper structure 21 continuously remain horizontal during the lowering process.

[0076] In an embodiment, step S20 includes:

[0077] S21: connecting upper cushion beams at positions corresponding to each of the first lifting holes on the top of the bridge;

[0078] S22: installing the through-hole jacks above each of the upper cushion beams;

[0079] S23: connecting lower cushion beams at positions corresponding to each of the second lifting holes on the bottom of the upper structure;

[0080] S24: installing the anchorage devices below each of the lower cushion beams;

[0081] S25: connecting the anchorage device with the corresponding through-jack by threading the steel strand through the first lifting hole and the corresponding second lifting hole in sequence.

[0082] It can be explained that the upper cushion beam is fixedly installed at the position corresponding to each first lifting hole 11 on the top of the bridge 10, the contact area of the through-jack 32 with the top surface of the bridge 10 is expanded by the upper cushion beam to disperse the concentrated load; then the through-jack 32 is stably installed above each upper cushion beam to ensure that the base of the through-jack 32 is fully attached to the upper cushion beam; at the same time, the lower cushion beam is fixedly connected at the position corresponding to each second lifting hole 23 on the bottom of the upper structure 21 of the Bailey beam 20, the load of the anchorage device 31 is uniformly transmitted to the upper structure 21 through the lower cushion beam; the anchorage device 31 is installed below each lower cushion beam to form a rigid connection body with the lower cushion beam; finally, the steel strand 30 is threaded through the corresponding first lifting hole 11 and second lifting hole 23 in sequence to reliably connect the anchorage device 31 with the through-jack 32.

[0083] In an embodiment, step S21 comprises:

[0084] S211: placing two rows of I-beams side by side with intervals, forming an installation gap between the two rows of I-beams;

[0085] S212: welding a steel plate on the top and bottom of the two rows of I-beams respectively;

[0086] S213: opening two through holes on the two steel plates respectively, the two through holes are arranged vertically opposite to each other, each through hole is connected to the installation gap, forming the upper cushion beam;

[0087] S214: welding the upper cushion beam on the top of the bridge, so that each through hole is vertically opposite to the first lifting hole.

[0088] Further, the upper cushion beam comprises two rows of I-beams and two steel plates, after the upper cushion beam is constructed and formed, the upper cushion beam is welded on the top of the bridge 10, so that the through holes on each steel plate are arranged corresponding to the first lifting hole 11, and the steel strand 30 is threaded through. The structure of the upper cushion beam is simple, easy to manufacture and install, and can ensure that the stress axis of the steel strand 30 is consistent with the structural axis of the bridge 10, avoiding eccentric stress and improving the transmission efficiency of the counterforce of the through-jack 32 to the top of the bridge 10, thereby providing a stable and reliable support foundation for the through-jack 32.

[0089] In an embodiment, the lower structure comprises a plurality of pipe piles and a connecting beam connected between any two adjacent pipe piles, and step S50 comprises:

[0090] S51: removing the connecting bolts between the pipe pile and the connecting beam connected thereto;

[0091] S52: using the crane to lift away each of the tie beams;

[0092] S53: binding a lifting belt at a position one third of the way down from the top of the pipe pile;

[0093] S54: removing the column bolt connecting the bottom of the pipe pile to the ground;

[0094] S55: using the crane to lift the pipe pile via the lifting belt to lay the pipe pile down;

[0095] S56: repeating the above steps until all of the pipe piles and the tie beams are removed.

[0096] It can be understood that, when removing the lower structure 22 of the Bailey beam 20, first, the connecting bolt between the pipe pile and the tie beam connected thereto is removed to separate the pipe pile from the tie beam; then, the crane is used to lift away each of the tie beams to remove the connecting member between the pipe piles; then, the lifting belt is bound at a position one third of the way down from the top of the pipe pile to provide a reliable point of application for lifting the pipe pile; then, the column bolt connecting the bottom of the pipe pile to the ground is removed to release the fixing constraint of the bottom of the pipe pile; finally, the crane is used to lift the pipe pile via the lifting belt to lay the pipe pile down stably; the steps of removing the bolt, lifting away the tie beam, binding the lifting belt, removing the column bolt, and lifting the pipe pile down are repeated until all of the pipe piles and the tie beams are removed. The sequence of removing the pipe piles and the tie beams is scientifically designed, the tie beams connecting adjacent pipe piles are first removed to effectively release the mutual constraint between the pipe piles, thereby creating conditions for safely lifting away the single pipe pile later; the lifting belt is bound at a position one third of the way down from the top of the pipe pile, which can ensure the balance of the pipe pile during lifting better than binding at the top, thereby significantly reducing the risk of overturning during lifting.

[0097] In an embodiment, the number of the first lifting holes 11 and the second lifting holes 23 is four, and the four first lifting holes 11 and the four second lifting holes 23 are arranged at the four corners of the bridge 10; the number of the first safety holes 12 and the second safety holes 24 is four, and the four first safety holes 12 are arranged close to the four first lifting holes 11 respectively, and the four second safety holes 24 are arranged close to the four second lifting holes 23 respectively.

[0098] It should be noted that the four first lifting holes 11 and the four second lifting holes 23 are arranged at the four corners of the bridge 10 and the superstructure 21, so that the four through jacks 32 can act on the four corner points of the superstructure 21, ensuring that the superstructure 21 is uniformly stressed in the synchronous lowering process, effectively preventing local overload and structural deformation. The four first safety holes 12 are arranged adjacent to the four first lifting holes 11 respectively, and the four second safety holes 24 are arranged adjacent to the four second safety holes 24 respectively, so that the safety device formed by the threaded steel 40 can act on the main load-bearing system of the steel strand 30. When any lifting point is accidentally unloaded, the adjacent safety device can immediately bear the load at this place, avoiding sudden load changes that cause structural instability. The pair arrangement of the four corner main lifting points and the adjacent safety points synergizes from the aspects of structural stress and emergency protection, significantly improving the stability and safety of the superstructure 21 during the whole process of tilting rotation leveling and overall lowering, effectively preventing the structure from tilting, deviating or accidentally falling.

[0099] It can be explained that in the method for removing the whole Bailey beam of the inclined high-pier bridge, the through jack 32 uses the existing technology, the steel strand 30, the anchor 31, the threaded steel 40, and the I-beam all use the existing technology, and the specific size is determined according to the actual specifications of the bridge 10 and the Bailey beam 20. In an embodiment, the steel strand 30 is made of 7 steel bars with a diameter of 15.2 mm, the anchor 31 is correspondingly made of a 7-hole anchor 31, the threaded steel 40 is made of a threaded steel 40 with a diameter of 40 mm, the I-beam of the upper cushion beam is made of an I60 specification I-beam, the diameters of the first lifting hole 11 and the second lifting hole 23 are both 140 mm, and the diameters of the first safety hole 12 and the second safety hole 24 are both 100 mm.

[0100] The above description is only an exemplary embodiment of the present application, and does not limit the protection scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like within the technical concept of the present application, using the contents of the present application specification and drawings, are included in the protection scope of the present application.

Claims

1. A method for removing a whole frame of a Bailey beam of an inclined high pier bridge, characterized in that, The method comprises the steps of: reserving a plurality of first lifting holes and a plurality of first safety holes on the bridge, and reserving a plurality of second lifting holes and a plurality of second safety holes on the upper structure of the Bailey beam; the plurality of first lifting holes and the plurality of second lifting holes are arranged one by one in correspondence, and the plurality of first safety holes and the plurality of second safety holes are arranged one by one in correspondence; installing a through-hole jack at the position corresponding to each first lifting hole on the top of the bridge, respectively, and arranging an anchor device at the position corresponding to each second lifting hole on the bottom of the upper structure, respectively, connecting each anchor device with the corresponding through-hole jack through a steel strand, and the steel strand is sequentially arranged in the corresponding first lifting hole and second lifting hole; arranging a first nut at the position corresponding to each first safety hole on the top of the bridge, respectively, and arranging a second nut at the position corresponding to each second safety hole on the bottom of the upper structure, respectively, connecting each first nut with the corresponding second nut through a threaded steel, and the threaded steel is sequentially arranged in the corresponding first safety hole and second safety hole; disconnecting the connection between the upper structure and the lower structure of the Bailey beam, so as to separate the upper structure and the lower structure; removing the lower structure; installing a measuring point at the position corresponding to each through-hole jack on the bottom of the upper structure, respectively, and installing a displacement measuring instrument at the position corresponding to each measuring point on the ground, respectively; each displacement measuring instrument is used to obtain the distance value of the corresponding measuring point; each through-hole jack drives the steel strand to descend according to the corresponding distance value, and synchronously lowers each threaded steel, until the upper structure rotates from the inclined state to the horizontal state; connecting a limiting device on the upper structure; synchronously driving the corresponding steel strand to descend through a plurality of through-hole jacks, and synchronously lowering a plurality of threaded steels, until the upper structure and the limiting device are lowered to the ground as a whole; removing the upper structure and the limiting device on the ground.

2. The method of removing the entire falsework of bent caps of an inclined high-pier bridge according to claim 1, wherein The step that each through-hole jack drives the steel strand to descend according to the corresponding distance value, and synchronously lowers each threaded steel, until the upper structure rotates from the inclined state to the horizontal state, comprises: measuring the distance value between each displacement measuring instrument and the corresponding measuring point through the displacement measuring instrument, to obtain the relative elevation of each measuring point; obtaining the ground elevation of each displacement measuring instrument according to the terrain of the ground; calculating the adjusted elevation of each measuring point according to the relative elevation and the ground elevation; driving the corresponding steel strand to descend through each through-hole jack, and synchronously lowering each threaded steel, so as to lower the upper structure to the adjusted elevation.

3. The method of removing the entire falsework of bent caps of an inclined high-pier bridge according to claim 2, wherein The step of driving the corresponding steel strand to descend through each through-hole jack, and synchronously lowering each threaded steel, so as to lower the upper structure to the adjusted elevation, comprises: loosening each first nut; driving the corresponding steel strand to descend through each through-hole jack, until the position of the upper structure corresponding to the through-hole jack is lowered to the adjusted elevation; tightening the first nut.

4. The method of removing the entire falsework of bent caps of an inclined high-pier bridge according to claim 3, wherein The step of driving the steel strand down through each of the through core jacks, until the position of the superstructure corresponding to the through core jacks is lowered to the adjusted elevation comprises: Keeping the upper clamp of the through core jack clamping the steel strand, and the lower clamp loosening; The oil cylinder drives the upper clamp to move towards the lower clamp, so that the steel strand is lowered; Keeping the lower clamp clamping the steel strand, and the upper clamp loosening; The oil cylinder drives the upper clamp to move away from the lower clamp; Repeat the above steps until the position of the superstructure corresponding to the through core jacks is lowered to the adjusted elevation.

5. The method of removing the entire falsework of bent caps of an inclined high-pier bridge according to claim 2, wherein The step of synchronously driving the steel strand down through the through core jacks, and synchronously lowering the threaded steel, until the superstructure and the limiting device are lowered to the ground as a whole comprises: Synchronously driving the steel strand down through the through core jacks, and synchronously lowering the threaded steel, until the superstructure and the limiting device are lowered to the ground as a whole; Driving the steel strand down through each of the through core jacks, so that the relative elevations of the measuring points are kept consistent, so that the superstructure is arranged in parallel with the ground; Synchronously driving the steel strand down through the through core jacks, and synchronously lowering the threaded steel, until the superstructure and the limiting device are in close contact with the ground.

6. The method of removing the entire falsework of bent beams of an inclined high-pier bridge according to any one of claims 1 to 5, wherein The superstructure comprises a plurality of spaced-apart Bailey pieces, and the step of connecting the limiting device on the superstructure comprises: Welding two first channel steels on both sides of the superstructure, respectively; Welding a second channel steel between the two first channel steels, and welding the second channel steel with each of the Bailey pieces to form the limiting device.

7. The method of removing the entire falsework of bent beams of an inclined high-pier bridge according to any one of claims 1 to 5, wherein The step of sequentially threading the steel strand through the corresponding first lifting hole and second lifting hole comprises: Connecting an upper pad beam at the position corresponding to each of the first lifting holes on the top of the bridge; Installing the through core jack above each of the upper pad beams; Connecting a lower pad beam at the position corresponding to each of the second lifting holes on the bottom of the superstructure; Installing the anchor below each of the lower pad beams; Connecting the anchor with the corresponding through core jack through the steel strand sequentially threaded through the first lifting hole and the corresponding second lifting hole.

8. The method of removing the entire falsework of bent caps of an inclined high-pier bridge according to claim 7, wherein The step of connecting an upper pad beam at the position corresponding to each of the first lifting holes on the top of the bridge comprises: Placing two rows of I-shaped steel side by side at intervals, forming an installation gap between the two rows of I-shaped steel; Welding a steel plate on the top and bottom of the two rows of I-shaped steel, respectively; Opening two through holes on the two steel plates, respectively, so that the two through holes are arranged in vertical opposition, and each of the through holes is connected to the installation gap, forming the upper pad beam; The upper cushion beam is welded on the top of the bridge, and each through hole is vertically opposite to the first lifting hole.

9. The method of removing the entire falsework of bent beams of an inclined high-pier bridge according to any one of claims 1 to 5, wherein The lower structure comprises a plurality of pipe piles and tie beams connected between any two adjacent pipe piles, and the step of demolishing the lower structure comprises: releasing the connecting bolts between the pipe piles and the tie beams connected therewith; lifting each tie beam by a crane; binding a lifting belt at a position of a lower third of the top of the pipe pile; releasing the column foot bolts connecting the bottom of the pipe pile to the ground; lifting the pipe pile by the crane through the lifting belt to lay down the pipe pile; repeating the above steps until all the pipe piles and the tie beams are demolished.

10. The method of removing the entire falsework of bent beams of an inclined high-pier bridge according to any one of claims 1 to 5, wherein The number of the first lifting holes and the second lifting holes is four, and the four first lifting holes and the four second lifting holes are arranged at four corners of the bridge, and the number of the first safety holes and the second safety holes is four, and the four first safety holes are arranged close to the four first lifting holes respectively, and the four second safety holes are arranged close to the four second lifting holes respectively.

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