Pier dismantling construction method of existing bridge

Abstract

The invention belongs to the technical field of pier dismantling construction, and particularly relates to a pier dismantling construction method of an existing bridge. The method comprises the steps that a temporary supporting system is arranged near a to-be-dismantled bridge pier to jack a bridge span; a cutting sequence and cutting blocks are designed, and all cutting lines are drawn on the pier to be dismantled; arranging a rope cutting construction platform for placing diamond rope saw cutting equipment, and arranging hoisting equipment on the bridge span; a plurality of lifting holes corresponding to the cutting blocks are formed in the bridge span, the lifting end of the lifting device penetrates through the lifting holes to be connected to one cutting block, the diamond wire saw cutting device is used for cutting the cutting block, and after cutting is completed, the lifting device is used for lowering the cutting block and transporting the cutting block outwards. And block cutting, lowering and transferring of a tie beam, a cover beam and two pier columns of the to-be-dismantled pier are sequentially completed according to the cutting sequence. Damage and influence on the existing bridge and the surrounding environment during bridge pier dismantling construction can be reduced, and the safety of bridge pier dismantling construction of the existing bridge is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge pier removal construction, and in particular relates to a bridge pier removal construction method for an existing bridge. Background Art

[0002] With the construction and development of highway bridges, existing bridges may need to be replaced for maintenance, renovation, or to avoid new bridges. Figure 1 , Figure 2 As shown, existing bridges generally include an upper structure, a lower structure and a support 3; the upper structure is also called a span 1, and many spans 1 are composed of multiple T-beams 11; the lower structure includes piers 2 and foundations, wherein many piers 2 are double-column frame piers, including two oppositely arranged piers 21, a cap beam 22 connected to the top ends of the two piers 21, and at least one tie beam 23 connected between the two piers 21, and a plurality of support pads 24 are provided on the top surface of the cap beam 22; a plurality of supports 3 are installed one by one on the support pads 24, and the supports 3 are force transmission devices at the support points of the span 1 and the piers 2.

[0003] When replacing piers, a temporary support system is usually set up near the pier 2 to be demolished of the existing bridge. The temporary support system is used to lift the ends of the front and rear spans 1 above the pier 2 to be demolished, so that the front and rear spans 1 are separated from the pier 2 to be demolished. The pier 2 to be demolished is then demolished, and a new pier is built after the demolition. The front and rear spans 1 are then placed on the new pier to realize the pier replacement construction of the existing bridge.

[0004] When demolishing the bridge pier 2, the traditional demolition method is mainly blasting. The blasting method has high construction noise, requires a large site, and the splashing debris generated can easily cause damage or destruction to the existing bridge or the surrounding environment. The construction safety is poor, and a large amount of slag cleaning work is required after the blasting, resulting in low construction efficiency.

[0005] In view of this, during the demolition of the pier 2 of the existing bridge to be demolished, how to reduce the damage and impact of the pier 2 demolition construction on the existing bridge and the surrounding environment and improve the safety of the pier demolition construction are technical issues that need to be focused on and solved during the demolition construction of the pier 2 of the existing bridge. Summary of the invention

[0006] In view of the deficiencies existing in the related art, the present invention provides a construction method for dismantling the piers of an existing bridge.

[0007] The present invention provides a method for dismantling a pier of an existing bridge, comprising the following steps:

[0008] Lifting of the bridge span: A temporary support system is set up near the pier to be removed of the existing bridge, and the ends of the front and rear spans above the pier to be removed are lifted using the temporary support system to separate the front and rear spans from the pier to be removed;

[0009] Lofting cutting lines: Design the cutting sequence and cutting blocks for the tie beam, cap beam and two piers of the bridge pier to be demolished; draw all cutting lines on the bridge pier to be demolished with ink lines according to the block form of the cutting blocks;

[0010] Demolition equipment layout: set up a rope cutting construction platform to place the diamond wire saw cutting equipment; set up the hoisting equipment on the front and rear spans above the pier to be demolished;

[0011] Bridge pier removal operation: A plurality of lifting holes corresponding to a plurality of cutting blocks are respectively opened on the front and rear bridge spans above the bridge pier to be removed; according to the cutting sequence, the lifting end of the lifting equipment is passed through the lifting holes on the front and rear bridge spans and connected to a cutting block; the cutting block is cut by a diamond wire saw cutting device, and after the cutting is completed, the cutting block is lowered by the lifting equipment, and then the cutting block is transferred to a preset storage area; in this way, the block cutting, lowering and transfer of the tie beam, cap beam and two pier columns of the bridge pier to be removed are completed, thereby completing the removal construction of the bridge pier to be removed.

[0012] In some of the embodiments, in the step of laying out the cutting line, the cutting sequence is specifically designed as follows: the tie beam is used as the first cutting level, the cap beam portion that does not correspond to the pier is used as the second cutting level, the cap beam portion that corresponds to the pier is used as the third cutting level, and the two piers are used as the fourth cutting level.

[0013] In some of the embodiments, in the step of laying out the cutting line, the design of the cutting blocks is specifically as follows: the tie beam is divided into blocks horizontally, with the first cutting block being arranged in the middle of its length direction, and the second cutting block, the third cutting block, ..., the nth cutting block are arranged on both sides in turn; the cap beam portion that does not correspond to the pier is divided into blocks horizontally, with the first cutting block being arranged in the middle of its length direction, and the second cutting block, the third cutting block, ..., the mth cutting block are arranged on both sides in turn; the cap beam portion corresponding to the pier is divided into blocks obliquely, with the first cutting block and the second cutting block being arranged on the side away from the two piers, and the third cutting block and the fourth cutting block being arranged on the side close to the two piers, respectively; the two piers are divided into blocks vertically, with the first cutting block and the second cutting block being arranged at the top of the two piers in the height direction, and the third cutting block, the fourth cutting block, ..., the kth cutting block are arranged downward in turn.

[0014] In some of the embodiments, the hoisting equipment includes a hoisting frame and two hoisting winches. The hoisting frame is provided with two sets of pulley groups, and the driving end of each set of pulley groups is connected to a hoisting winch. In the steps of the pier removal operation, the hoisting ends of the two sets of pulley groups are connected to the same cutting block through the hoisting holes. After each cutting block is cut, the cutting block is lowered by the hoisting winch.

[0015] In some of the embodiments, the hoisting equipment also includes a traction winch, which is arranged on the ground laterally outside the temporary support system; in the step of bridge pier dismantling operation, the traction winch is also connected to the cutting block, and when the hoisting winch lowers the cutting block, the traction winch is used to adjust the lowering direction of the cutting block.

[0016] In some of the embodiments, the step of arranging the demolition equipment also includes laying a longitudinally extending transport track on the ground between two piers of the pier to be demolished, and a transfer flat car that can move along the transport track is installed on the transport track; in the step of the pier demolition operation, a hoisting winch and a traction winch are used to lower the cut block to the transfer flat car, and then the cut block is transferred to a preset storage area.

[0017] In some of the embodiments, before the pier removal operation is performed, a plurality of cross-shaped frames are vertically arranged outside each pier column of the pier to be removed, the cross-shaped frames are clamped to the pier column, and the longitudinal ends of the cross-shaped frames are connected to a temporary support system.

[0018] In some of the embodiments, before the pier removal operation is performed, a plurality of longitudinally extending support beams are arranged under the cap beam of the pier to be removed, and the support beams are connected to a temporary support system; during the pier removal operation, when the cap beam is cut, a plurality of pads are set between two support beams corresponding to the cap beam cutting block, and the top surface of the pads is made to abut against the bottom surface of the cutting block, and when the cutting of the cap beam cutting block is completed, the pads and the support beams that hinder the lowering of the cutting block are removed.

[0019] In some of the embodiments, in the step of dismantling equipment arrangement, a springboard is laid on a temporary support system, on a steel pipe scaffolding or on the ground with reference to the position of the cutting block to form a rope cutting construction platform.

[0020] In some of the embodiments, during the pier removal operation, all the hanging holes are located at the wet joints of the T-beams of the bridge span.

[0021] Based on the above technical scheme, the bridge pier removal construction method of the existing bridge in the embodiment of the present invention can reduce the damage and impact on the existing bridge and the surrounding environment during the bridge pier removal construction, improve the safety of the bridge pier removal construction of the existing bridge, and improve the efficiency of the bridge pier removal construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 This is the cross-sectional elevation of the existing bridge;

[0024] Figure 2 This is the longitudinal elevation of the existing bridge;

[0025] Figure 3 It is a flow chart of the bridge pier removal construction method of the existing bridge of the present invention;

[0026] Figure 4 It is a horizontal and vertical relationship diagram of the temporary support system in the present invention and the existing bridge;

[0027] Figure 5 It is a longitudinal elevation relationship diagram of the temporary support system in the present invention and the existing bridge;

[0028] Figure 6 It is a planar relationship diagram of the temporary support system and the bridge pier to be removed in the present invention;

[0029] Figure 7 The cutting sequence and design drawing of the cutting blocks of the bridge piers to be removed in the present invention;

[0030] Figure 8 It is a horizontal elevation layout diagram of a partially dismantled device in the present invention;

[0031] Fig. 9 It is a longitudinal elevation layout diagram of a partially dismantled device in the present invention;

[0032] Fig.10 It is a schematic diagram of the longitudinal elevation of the diamond wire saw cutting device in the present invention when cutting the cap beam;

[0033] Fig.11 It is a cross-sectional view of the cutting block during transportation in the present invention;

[0034] Fig.12 It is a plan view of the cutting block during transportation in the present invention.

[0035] In the figure: 1. Bridge span; 11. T-beam; 12. Wet joint; 13. Lifting hole; 2. Bridge pier; 21. Pier column; 22. Cap beam; 23. Tie beam; 24. Support pad stone; 3. Support; 4. Temporary support system; 41. Temporary support foundation; 42. Steel pipe bracket; 421. Front steel pipe rack; 422. Rear steel pipe rack; 423. Steel pipe column; 424. Flat joint; 425. Diagonal brace; 43. Jacking system; 44. Emergency jacking system; 51. Steel pipe scaffolding; 52. Springboard; 53. Diamond wire saw cutting equipment; 54. Lifting frame; 55. Pulley block; 56. Lifting winch; 57. Traction winch; 58. Transfer flat car; 59. Transport track; 60. Cutting block; 70. T-shaped frame; 80. Support beam; 90. Pads. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. 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 making creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "top", "bottom", "inside", "outside", "left", "right", "front", "back", "vertical", "horizontal", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] refer to Figure 1-Figure 12As shown, the present invention provides a method for dismantling the piers of an existing bridge, including the steps of lifting the span 1, laying out the cutting line, arranging the dismantling equipment, dismantling the pier 2, and the like.

[0041] The lifting step of the span 1 includes setting up a temporary support system 4 near the pier 2 to be removed of the existing bridge, and using the temporary support system 4 to lift the ends of the front and rear spans 1 above the pier 2 to be removed, so that the front and rear spans 1 are separated from the pier 2 to be removed. Further explanation: the temporary support system 4 includes a temporary support foundation 41 and two sets of steel pipe brackets 42 installed on the temporary support foundation 41; the temporary support foundation 41 is constructed in the area near the pier 2 to be removed, and the construction of the temporary support foundation 41 includes the insertion of multiple pile foundations, excavation of foundation pits, support of pedestal templates, binding of pedestal steel bars, casting of foundation pedestals, etc., thereby improving the bearing capacity of the construction ground and providing a solid and stable installation foundation for the steel pipe brackets 42; the two sets of steel pipe brackets 42 are respectively located on the longitudinal sides of the pier 2 to be removed and below the span 1 of the existing bridge. Each set of steel pipe supports 42 includes a front row of steel pipe supports 421 close to the pier 2 to be demolished and a rear row of steel pipe supports 422 away from the pier 2 to be demolished. Each row of steel pipe supports includes a plurality of transversely arranged steel pipe columns 423. The steel pipe columns 423 are mainly formed by connecting a plurality of vertically arranged steel pipe segments. A parallel joint 424 and a diagonal brace 425 are also connected between two adjacent steel pipe segments of each set of steel pipe supports 42, thereby connecting the front and rear rows of steel pipe frames into a whole, thereby improving the structural strength and stability of the steel pipe supports 42. A jacking system 43 is installed on the top of each front row of steel pipe racks 421. The top surfaces of the jacking systems 43 on the two sets of steel pipe brackets 42 are respectively pressed against the bottom surfaces of the T beams 11 of the bridge spans 1 above them. The jacking system 43 is used to jack up the bridge span 1, temporarily support it after jacking up, and fall back after the piers are replaced; an emergency jacking system 44 is installed on the top of each rear row of steel pipe racks 422. A safety gap is reserved between the top surfaces of the emergency jacking systems 44 on the two sets of steel pipe brackets 42 and the bottom surfaces of the T beams 11 of the bridge spans 1 above them. Further, the jacking systems 43 on the two sets of steel pipe brackets 42 are used to jack up the ends of the front and rear bridge spans 1 located above the bridge piers 2 to be removed, and the jacking is stopped after the bridge spans 1 are completely separated from the bridge piers 2 to be removed; at this time, the ends of the front and rear bridge spans 1 located above the bridge piers 2 to be removed are completely supported by the two sets of steel pipe brackets 42 and the jacking systems 43 thereon, and the connection between the bridge piers 2 to be removed and the bridge spans 1 is released.

[0042] The step of laying out the cutting lines includes the cutting sequence of the tie beam 23, the cap beam 22 and the two piers 21 of the pier 2 to be demolished and the design of the cutting block 60; according to the block form of the cutting block 60, all cutting lines are drawn on the pier 2 to be demolished with ink lines to facilitate the subsequent block cutting of the pier 2 to be demolished.

[0043] The dismantling equipment arrangement step includes: setting up a rope cutting construction platform for placing the diamond rope saw cutting equipment 53; and setting up a hoisting device on the front and rear two bridge spans 1 above the bridge pier 2 to be dismantled.

[0044] The steps of dismantling the pier 2 include: opening a plurality of hanging holes 13 corresponding to a plurality of cutting blocks 60 on the front and rear spans 1 above the pier 2 to be dismantled; passing the hanging end of the hanging device through the hanging holes 13 on the front and rear spans 1 and connecting to a cutting block 60 according to the cutting sequence; cutting the cutting block 60 by using a diamond wire saw cutting device 53, the vibration and noise of the diamond wire saw cutting device 53 are very small, so that the cutting block 60 can be separated with almost no disturbance; after the cutting of the cutting block 60 is completed, the cutting block 60 is slowly lowered by using the hanging device, and then the cutting block 60 is transferred to a preset storage area; in this way, the block cutting, lowering and transfer of the tie beam 23, the cap beam 22 and the two pier columns 21 of the pier 2 to be dismantled are completed, and then the dismantling construction of the pier 2 to be dismantled is completed.

[0045] The above-mentioned schematic embodiment realizes the demolition construction of the bridge pier 2 to be demolished by cutting into blocks. Compared with the traditional blasting demolition method, it can significantly reduce the damage and impact on the existing bridge and the surrounding environment during the demolition construction of the bridge pier 2, improve the safety of the demolition construction of the bridge pier 2 of the existing bridge, and reduce the difficulty of the demolition construction of the bridge pier 2. It solves the problems of the traditional blasting demolition method such as high construction noise, large required site, easy damage or damage to the existing bridge or the surrounding environment, and poor demolition construction safety. There is no need to carry out a large amount of slag cleaning work, thereby improving the demolition construction efficiency of the bridge pier 2.

[0046] In some embodiments, in the step of laying out the cutting line, the cutting sequence is specifically designed as follows: the tie beam 23 is used as the first cutting level, the part of the cap beam 22 that does not correspond to the pier 21 is used as the second cutting level, the part of the cap beam 22 that corresponds to the pier 21 is used as the third cutting level, and the two piers 21 are used as the fourth cutting level; further, cutting the tie beam 23 first will not have a significant impact on the main structure of the pier 2 to be removed, and will not cause the risk of instability or overturning of the pier 2 to be removed, and on the other hand, it can provide space for the lowering of the cutting block 60 of the cap beam 22. This exemplary embodiment clarifies the cutting sequence of the pier 2 to be removed, and improves the safety and convenience of the removal construction of the pier 2.

[0047] refer to Figure 7As shown, in some embodiments, in the step of laying out the cutting line, the design of the cutting block 60 is specifically as follows: the tie beam 23 is divided into blocks in a transverse manner, wherein the first cutting block J1 is arranged in the middle of its length direction, and the second cutting block J2, the third cutting block J3, ..., the nth cutting block Jn are arranged on both sides in turn, and the cutting of the tie beam 23 will be carried out in the order of J1, J2, J3, ..., Jn; the portion of the cap beam 22 that does not correspond to the pier 21 is divided into blocks in a transverse manner, wherein the first cutting block G1 is arranged in the middle of its length direction, and the second cutting block G2, the third cutting block G3, ..., the mth cutting block Gm are arranged on both sides in turn; the portion of the cap beam 22 that corresponds to the pier 21 is divided into blocks in an oblique manner The first cutting block C1 and the second cutting block C2 are respectively arranged on the side away from the two piers 21, and the third cutting block C3 and the fourth cutting block C4 are respectively arranged on the side close to the two piers 21; the cap beam 22 will be cut in the order of G1, G2, G3, ..., Gm, C1, C2, C3, C4; the two piers 21 adopt the vertical block method, the first cutting block Z1 and the second cutting block Z2 are respectively arranged at the top of the height direction of the two piers 21, and the third cutting block Z3, the fourth cutting block Z4, ..., the kth cutting block Zk are arranged downward in turn, and the two piers 2121 will be cut in the order of Z1, Z2, Z3, Z4, ..., Zk. The weight of each cutting block 60 is usually controlled within 10t, but it is not limited to this, and it will be controlled by referring to the parameters of the hoisting equipment. This exemplary embodiment clarifies the block form of the cutting blocks 60 on the tie beam 23, the cap beam 22 and the two pier columns 21 of the bridge pier 2 to be demolished, which can reduce the unbalanced load during the subsequent cutting of the bridge pier 2 to be demolished.

[0048] refer to Figure 8-Figure 11 As shown, in some embodiments, the hoisting equipment includes a hoisting frame 54 and two hoisting winches 56. The two legs of the hoisting frame 54 are respectively supported on the bridge deck of the two spans 1. Two sets of pulley groups 55 are arranged on the hoisting frame 54. The driving end of each pulley group 55 is connected to a hoisting winch 56. In the step of dismantling the bridge pier 2, the hoisting ends of the two pulley groups 55 are respectively connected to the same cutting block 60 through the hoisting holes 13 on the front and rear spans 1; after each cutting block 60 is cut, the hoisting winch 56 is used to drive the hoisting end of the pulley group 55 to move to slowly lower the cutting block 60. This exemplary embodiment refines the setting of the hoisting equipment to achieve the lowering of the cutting block 60.

[0049] refer to Figure 8As shown, in some embodiments, the hoisting equipment further includes a traction winch 57, which is arranged on the ground laterally outside the temporary support system 4. In the step of dismantling the bridge pier 2, the traction winch 57 is also connected to the cutting block 60; when the hoisting winch 56 lowers the cutting block 60, the traction winch 57 is used to lateral pull the cutting block 60 to adjust the lowering direction of the cutting block 60, and lower the cutting block 60 through the gap. In this exemplary embodiment, through the setting of the traction winch 57, the cutting block 60 being lowered can be pulled crooked to avoid interference with the steel pipe support 42, etc., so that the cutting block 60 can be smoothly lowered to avoid damage and impact on the existing bridge and the surrounding environment.

[0050] refer to Fig.11 , Fig.12 As shown, in some embodiments, in the step of dismantling equipment arrangement, it also includes laying a longitudinally extending transport track 59 on the ground between the two piers 21 of the pier 2 to be dismantled, the transport track 59 extends outward through the gap of the steel pipe support 42, and a transfer flat car 58 that can move along the transport track 59 is installed on the transport track 59, and a plurality of wheels are installed at the bottom of the transfer flat car 58. In the step of dismantling the pier 2, after the cutting block 60 is lowered to the transfer flat car 58 by using the hoisting winch 56 and the traction winch 57, the connection between the hoisting winch 56 and the traction winch 57 and the cutting block 60 is released, and the transfer flat car 58 carries the cutting block 60 along the transport track 59 to move out of the construction area and transport it out, until the cutting block 60 is transported to a preset storage area. This exemplary embodiment realizes the transportation of the cutting block 60, making the construction site neat and orderly.

[0051] refer to Figure 4-Figure 6 , Figure 8 , Fig.11 As shown, in some embodiments, before the removal of the bridge pier 2 is performed, a plurality of cross-shaped frames 70 are vertically arranged outside each pier column 21 of the bridge pier 2 to be removed, the cross-shaped frames 70 are clamped with the pier column 21, and the longitudinal ends of the cross-shaped frames 70 are connected to the temporary support system 4. Specifically, the longitudinal ends of the cross-shaped frames 70 can be respectively connected to the flat joints 424 of the two front steel pipe frames 421. Since the pier column 21 will have an unbalanced load when the cap beam 22 is cut and removed, the setting of the cross-shaped frames 70 can prevent the pier column 21 from being eccentrically unstable or even overturned when the cap beam 22 is cut, thereby ensuring the safety of the removal of the bridge pier 2.

[0052] refer to Figure 4-Figure 5 , Figure 8-Figure 9As shown, in some embodiments, before performing the pier 2 removal operation, a plurality of longitudinally extending support beams 80 are arranged under the cap beam 22 of the pier 2 to be removed, and the support beams 80 are connected to the temporary support system 4. Specifically, the support beams 80 can be connected between the uppermost flat connectors 424 of the two front rows of steel pipe racks 421. In the step of dismantling the bridge pier 2, when the cap beam 22 is cut, a plurality of wooden blocks 90 are set between the two supporting beams 80 corresponding to the cutting block 60 of the cap beam 22, and the top surface of the wooden block 90 is made to abut against the bottom surface of the cutting block 60; the cutting block 60 of the cap beam 22 is supported by the supporting beams 80 and the wooden blocks 90, so as to cooperate with the hoisting winch 56 to tighten the cutting block 60 of the cap beam 22, and ensure that the impact force generated at the moment when the cutting block 60 of the cap beam 22 is cut off will not cause adverse effects on the bridge deck; when the cutting of the cutting block 60 of the cap beam 22 is completed, the cutting block 60 can be slightly lifted by the hoisting winch 56, so as to remove the wooden blocks 90 and the supporting beams 80 that hinder the lowering of the cutting block 60 of the cap beam 22, thereby facilitating the lowering and transportation of the cutting block 60. In addition, when the first cutting block G1 in the middle of the length direction of the cap beam 22 is cut, the cap beam 22 is in the maximum cantilever state. To ensure the stability of the cap beam 22 and the pier 21 at this time, a jack rope is also hung on the bridge deck to use the jack rope to lift the cantilever end of the cap beam 22. This exemplary embodiment further ensures the safety of the removal construction of the bridge pier 2 by setting the support beam 80 and the pad 90.

[0053] refer to Fig.10 As shown, in some embodiments, in the step of dismantling equipment arrangement, referring to the position of the cutting block 60, a springboard 52 is laid on the steel pipe bracket 42 of the temporary support system 4, on the erected steel pipe scaffolding 51 or on the ground, thereby forming a rope cutting construction platform for placing the diamond rope saw cutting equipment 53.

[0054] refer to Fig.11 As shown, in some embodiments, during the step of dismantling the pier 2, all the lifting holes 13 are located at the wet joints 12 of the T-beam 11 of the span 1; thereby preventing the lifting holes 13 from causing damage to the main stress-bearing parts of the span 1, such as the web of the T-beam 11.

[0055] In summary, the bridge pier removal construction method of the existing bridge of the present invention can reduce the damage and impact on the existing bridge and the surrounding environment during the bridge pier 2 removal construction, ensure the safety of the bridge pier 2 removal construction of the existing bridge, and improve the bridge pier 2 removal construction efficiency.

[0056] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0057] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A construction method for dismantling bridge piers of an existing bridge, characterized in that: The following steps are involved: Lifting of the bridge span: a temporary support system is set up near the bridge pier to be removed of the existing bridge, and the ends of the front and rear bridge spans above the bridge pier to be removed are lifted by using the temporary support system to separate the front and rear bridge spans from the bridge pier to be removed; Lofting cutting lines: Design the cutting sequence and cutting blocks for the tie beam, cap beam and two piers of the bridge pier to be demolished; draw all cutting lines on the bridge pier to be demolished with ink lines according to the block form of the cutting blocks; Demolition equipment layout: set up a rope cutting construction platform to place the diamond wire saw cutting equipment; Set up lifting equipment on the front and rear spans above the bridge piers to be removed; Pier demolition operation: a plurality of lifting holes corresponding to the plurality of cutting blocks are respectively opened on the front and rear spans above the pier to be demolished; according to the cutting sequence, the lifting end of the lifting device is passed through the lifting holes on the front and rear spans and connected to a cutting block; the cutting block is cut by the diamond wire saw cutting device, and after the cutting is completed, the cutting block is lowered by the lifting device, and then the cutting block is transferred to a preset storage area; in this way, the block cutting, lowering and transfer of the tie beam, cap beam and two pier columns of the pier to be demolished are completed, thereby completing the demolition construction of the pier to be demolished.

2. The method for dismantling the piers of an existing bridge according to claim 1, characterized in that: In the step of laying out the cutting line, the cutting sequence is specifically designed as follows: the tie beam is used as the first cutting level, the cap beam part that does not correspond to the pier is used as the second cutting level, the cap beam part that corresponds to the pier is used as the third cutting level, and the two piers are used as the fourth cutting level.

3. The method for dismantling the piers of an existing bridge according to claim 2, characterized in that: In the step of laying out the cutting line, the design of the cutting blocks is specifically as follows: the tie beam is divided into blocks horizontally, with the first cutting block being arranged in the middle of its length direction, and the second cutting block, the third cutting block, ..., the nth cutting block are arranged on both sides in turn; the cap beam part that does not correspond to the pier is divided into blocks horizontally, with the first cutting block being arranged in the middle of its length direction, and the second cutting block, the third cutting block, ..., the mth cutting block are arranged on both sides in turn; the cap beam part corresponding to the pier is divided into blocks obliquely, with the first cutting block and the second cutting block being arranged on the side away from the two piers, and the third cutting block and the fourth cutting block being arranged on the side close to the two piers, respectively; the two piers are divided into blocks vertically, with the first cutting block and the second cutting block being arranged at the top of the two piers in the height direction, and the third cutting block, the fourth cutting block, ..., the kth cutting block are arranged downward in turn.

4. The method for dismantling the piers of an existing bridge according to claim 1, characterized in that: The hoisting equipment includes a hoisting frame and two hoisting winches. The hoisting frame is provided with two sets of pulley groups, and the driving end of each set of the pulley groups is connected to one of the hoisting winches. In the steps of the pier removal operation, the hoisting ends of the two sets of the pulley groups are connected to the same cutting block through the hoisting holes. After each cutting block is cut, the cutting block is lowered by the hoisting winch.

5. The method for dismantling the piers of an existing bridge according to claim 4, characterized in that: The hoisting equipment also includes a traction winch, which is arranged on the ground laterally outside the temporary support system; in the step of the pier removal operation, the traction winch is also connected to the cutting block, and when the hoisting winch lowers the cutting block, the traction winch is used to adjust the lowering direction of the cutting block.

6. The method for dismantling the piers of an existing bridge according to claim 5, characterized in that: The step of arranging the demolition equipment also includes laying a longitudinally extending transport track on the ground between two piers of the pier to be demolished, and installing a transfer flat car that can move along the transport track on the transport track; in the step of the pier demolition operation, the cutting block is lowered onto the transfer flat car by using the hoisting winch and the traction winch, and then the cutting block is transferred to a preset storage area.

7. The method for dismantling the piers of an existing bridge according to claim 1, characterized in that: Before the pier removal operation is performed, a plurality of cross-shaped frames are vertically arranged outside each pier column of the pier to be removed. The cross-shaped frames are clamped to the pier column, and the longitudinal ends of the cross-shaped frames are connected to a temporary support system.

8. The method for dismantling the piers of an existing bridge according to claim 1, characterized in that: Before performing the pier removal operation, a plurality of longitudinally extending support beams are arranged under the cap beam of the pier to be removed, and the support beams are connected to a temporary support system; during the pier removal operation, when the cap beam is cut, a plurality of pads are set between two of the support beams corresponding to the cap beam cutting block, and the top surface of the pads is made to abut against the bottom surface of the cutting block, and when the cutting of the cap beam cutting block is completed, the pads and the support beams that hinder the lowering of the cutting block are removed.

9. The method for dismantling the piers of an existing bridge according to claim 1, characterized in that: In the step of arranging the demolition equipment, referring to the position of the cutting block, a springboard is laid on the temporary support system, on the erected steel pipe scaffolding or on the ground to form the rope cutting construction platform.

10. The method for dismantling the piers of an existing bridge according to claim 1, characterized in that: In the steps of the bridge pier removal operation, all of the hanging holes are located at the wet joints of the T-beams of the bridge span.

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