A bridge pier mobile working platform and construction method

Abstract

The present invention discloses a mobile working platform for bridge piers and a construction method thereof, comprising the piers, a concrete foundation, a cage, columns, vertical pipes, a working platform and a moving device, etc., wherein a platform hole having the same cross-sectional shape as the pier column and for the pier column to pass through is reserved in the center of the working platform; in this way, the working platform can be driven by the moving device to move up and down along the pier column or be fixed at different heights of the pier column by inserting pins into a plurality of pin holes on the vertical pipe to perform construction operations; at the same time, a sliding bracket and a fixed bracket are installed between the column and the vertical pipe, an anchor is formed between the sliding bracket and the column, and an anchor is also formed between the fixed bracket and the column, and then the sliding bracket and the fixed bracket cooperate with the working platform to install and remove the clamp on the pier column; therefore, this mobile working platform has the construction advantages of simple structure, convenient construction, low cost, safety, reliability and maneuverability, etc., and combined with the corresponding construction method, it has high economic and social benefits.

Description

Technical Field

[0001] The present invention relates to the field of bridge quality engineering construction, and in particular to a bridge pier mobile working platform and a construction method. Background Art

[0002] Bridge cap beam supports are often constructed using techniques such as the vertical tube floor support method, the pier column through steel rod method, and the pier column steel clamp method. Among them, the vertical tube floor support method occupies a large area of ​​ground, poses safety hazards, has high construction costs, and takes a long time to install and remove the support. For reconstruction projects where the space under the bridge must remain open to traffic, there are many construction restrictions. The pier column through steel rod method, on the other hand, inserts steel rods through holes in the bridge piers, which weakens the structural cross-section and affects the appearance and durability of the bridge piers. The existing pier column steel clamp method often uses a fixed working platform, and the standby time of the clamp installation and removal crane is long. For operations such as repairing defects on the piers or spraying decorative paint, it is often necessary to disassemble and assemble the work platform multiple times at different heights along the piers, resulting in a labor-intensive and time-consuming disassembly and assembly process. This is especially inefficient and ineffective for taller piers. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a mobile working platform and construction method for bridge piers which are simple in structure, convenient in construction, low in cost, safe, reliable and maneuverable.

[0004] The technical problem of the present invention is achieved through the following technical solutions:

[0005] A mobile working platform for bridge piers, comprising a row of multiple piers that have been completed, a concrete foundation cast on the ground between the row of multiple piers, and a cage. The bottom of the cage is firmly connected to the concrete foundation through anchor bolts. The side of the cage is provided with a column close to the pier, and the top of the column is at its highest point. A and the lowest point O Each of the plurality of supporting brackets is provided with a vertical pipe having a full length installed in the supporting bracket; a working platform connected to the vertical pipe by a moving device is provided, and the working platform comprises a plurality of longitudinal beams, a plurality of transverse beams, a plurality of diagonal braces and a plurality of lifting rings; the plurality of longitudinal beams and the plurality of transverse beams are welded to each other to form a platform skeleton, and the plurality of longitudinal beams are close to the vertical pipe. B The ends of the braces move up and down on the vertical pipes through multiple vertical pipe sleeves, and the upper ends of the multiple diagonal braces are connected to the other side of the vertical pipe. B * End anchoring, multiple diagonal braces with lower ends close to vertical pipes DThe end is also moved up and down on the vertical pipe through multiple vertical pipe sleeves; the center of the working platform is reserved with a platform hole with the same cross-sectional shape as the pier column for the pier column to pass through; the working platform is driven by a moving device to move up and down along the pier column or to be fixed at different heights of the pier column by inserting pins into multiple pin holes on the vertical pipe to perform construction work; a sliding bracket and a fixed bracket are installed between the column and the vertical pipe, and a sliding bracket is formed between the sliding bracket and the column. C Anchoring, forming a fixed space between the bracket and the column F The sliding bracket and the fixed bracket cooperate with the working platform to install and remove the clamps on the pier column.

[0006] The working platform is at the lowest point of the vertical pipe O and the highest point A Move between the lowest point of the vertical pipe O The concrete foundation and the support bracket are elastically fixed together, with the highest point A Elastic connection by supporting bracket, the forces are and ; Longitudinal beams of the working platform B End and diagonal bracing D The ends move up and down on the vertical pipe through the vertical pipe sleeve, and the longitudinal beam B End and diagonal bracing D The bottom of the vertical pipe sleeve at the end is respectively C At the fixed bracket F Considering the balanced force of cage and vertical pipe, longitudinal beam B The end passes through the sliding bracket C The force is transferred to the cage, and the diagonal support D The end passes through the fixed bracket F The force is transferred to the cage and the vertical pipe together; at the same time, due to the diagonal support D End and fixed bracket F Spacing h 3 Small, in order to simplify the calculation, the diagonal brace D Force at the end Move to the fixed bracket F If the bracket is fixed F The force at ; Use the vertical pipe as a support on the elastic support A、F、O The continuous beam with bending on the top, which supports A , support F It is a single elastic tension and compression support. O For elastic consolidation support, according to the elastic theory and the principle of force balance, the following force calculation formula is obtained.

[0007] Formula 1:

[0008] When installing and removing the clamp on the working platform, the vertical pipe is subjected to the greatest force. The force on a single vertical pipe is obtained under the most unfavorable conditions. , vertical pipe AF part, FO The differential equations of the compression and bending forces of the segment are

[0009] AF part:

[0010]

[0011] FO part:

[0012]

[0013] Boundary conditions and continuity conditions

[0014]

[0015] The physical equation is

[0016]

[0017] vertical pipe AF part, FO The solution of the differential equation for the segment is

[0018] AF part:

[0019]

[0020] FO part:

[0021]

[0022] In the formula

[0023]

[0024] From this we can understand ;

[0025] Formula 2:

[0026] According to the force equilibrium condition, we have

[0027]

[0028] Formula 3:

[0029]

[0030] Such as vertical pipe FA part, FO When the length of the segment is long, stability needs to be verified;

[0031] The symbols in Formula 1, Formula 2, and Formula 3 are defined as:

[0032] ——Respectively vertical pipe AO part, AF part, FO Segment length and bracing D From the end to the fixed bracket F Length, approximate calculation , ;

[0033] ——At the vertical pipe O Start to A The vertical coordinates at and the deformation curve equation of a single vertical pipe, ;

[0034] ——are the coefficients of the deformation curve of a single vertical pipe, ;

[0035] --exist oh my The rigidity of the hollow steel pipe section of a single vertical pipe in the plane is considered after the pin hole weakens. ;

[0036] ——Tensile strength of sliding bracket and fixed bracket, ;

[0037] ——Respectively single vertical pipe A Department, F The horizontal displacement at ;

[0038] ——Respectively single vertical pipe A Horizontal force at the location, single vertical pipe F Horizontal force at the location, single vertical pipe O The vertical and horizontal forces acting on the location, ;

[0039] ——When installing and removing the clamp on the working platform, the single vertical pipe and the diagonal support under the most unfavorable conditions D The moment and vertical force at the end, ;

[0040] ——Single vertical pipe O The consolidation bending moment at ;

[0041] —— The oh my allowable bending moment of a single vertical hollow steel pipe cross-section in the plane after considering the weakening of the pin holes, ;

[0042] —— The oh my allowable shear force of a single vertical hollow steel pipe cross-section in the plane after considering the weakening of the pin holes, .

[0043] The working platform is made of steel, and multiple longitudinal beams, multiple cross beams and multiple diagonal braces are all shaped steel; the multiple longitudinal beams and multiple cross beams are welded to form a "field" - shaped platform skeleton, and a platform steel plate is covered on the platform skeleton by welding or bolt anchoring; the platform holes are reserved in the center of the platform steel plate, and the cross-sectional dimension of the platform holes is 1 cm - 2 cm larger than the outer edge cross-sectional dimension of the pier column; the length of the vertical pipe sleeve is 2 - 3 times the outer diameter of the vertical pipe, the inner diameter is 2 mm - 3 mm larger than the outer diameter of the vertical pipe, and it moves vertically up and down along the vertical pipe; the working platform is surrounded by a platform guardrail formed by welding multiple steel pipes vertically and horizontally; the top surface of the working platform is provided with multiple lifting rings welded on multiple cross beams, each lifting ring is made of round steel bars, the center of the positions of the multiple lifting rings coincides with the center of gravity of the working platform, and the moving device drives the working platform to move up and down along the pier column, and the plane of the working platform moves up and down in a horizontal plane without jamming the outer edge surface of the pier column.

[0044] The support bracket is made of steel, and the support bracket includes a support seat, two clamping pieces on the support seat and multiple bolts connecting the two clamping pieces; the support seat is bolt - anchored at the highest point A or the lowest point at the bottom of the column O , and the vertical pipe is embedded 3 cm - 5 cm into the concrete foundation at the lowest point O ; the two clamping pieces clamp the vertical pipe and are clamped and fixed by multiple bolts, and the inner diameter when the two clamping pieces are clamped is the same as the outer diameter of the vertical pipe.

[0045] The sliding bracket is made of steel, and the sliding bracket includes a sliding seat, two clamping pieces on the sliding seat and multiple bolts connecting the two clamping pieces; the sliding seat is bolt - anchored at the C position of the column, and the C position of this place is determined according to the convenience of installing and removing the hoop or repairing and decorating the surface defects of the pier column; the two clamping pieces clamp the vertical pipe inside and are clamped and fixed by multiple bolts, and a spacer is added between the two clamping pieces to leave a 2 mm - 3 mm gap from the outer diameter of the vertical pipe.

[0046] The fixed bracket is made of steel, and the fixed bracket includes a fixed seat, two clamping pieces on the fixed seat and multiple bolts connecting the two clamping pieces; the fixed seat is bolt - anchored at the FDepartment, the F to C The length is equal to the longitudinal beam of the working platform B End to diagonal brace D The two clips clamp the vertical pipe and are clamped and fixed by multiple bolts.

[0047] The vertical tube is a hollow steel tube, the wall thickness of which is determined by calculation. The plurality of vertical tubes are provided with pin holes in pairs from top to bottom, and the spacing between each pair of pin holes is equal to United States or CF The length of the bolt holes and the number of holes to be opened depend on where the working platform needs to be located on the pier, but the distance between two adjacent bolt holes shall not be less than 30cm to 50cm.

[0048] The moving device includes a winch, a wire rope, a fixed pulley and a reversing wheel. The working platform is equipped with two fixed pulleys and a reversing wheel, one of which is installed at the line connecting the top of the cage and the center of a row of multiple piers, and the other fixed pulley is installed at the line connecting the bottom of the cage and the center of a row of multiple piers. A reversing wheel is installed at the line connecting the centers of a row of multiple piers between the piers and the vertical pipes. The lifting ring on the top surface of the working platform, the two fixed pulleys, the reversing wheel and the winch are connected by the wire rope. The winch of the moving device drives the wire rope to drive the working platform to move up and down.

[0049] The cage is made of steel and consists of multiple modular units with rectangular frames. Each modular unit is a stable structure composed of columns, vertical and horizontal bars, diagonal bars, plane grids, vertical safety nets and connectors. The multiple modular units are connected and fixed to each other by connectors and installed between a row of multiple piers. A cage guardrail is set on the top of the cage.

[0050] A construction method for a bridge pier mobile work platform comprises the following steps:

[0051] Step 1: Determine the structural dimensions of the working platform

[0052] Formulate the structural dimensions, layout and material selection of the working platform according to the height of the pier, working load and work content;

[0053] Calculate and review the structural dimensions, layout, and engineering material selection of the working platform using Formulas 1, 2, and 3;

[0054] ③ Prepare construction organization design documents and organize construction;

[0055] Step 2: Fabrication of vertical pipes, support brackets, sliding brackets, fixed brackets and working platforms, and purchase of cages and winches

[0056] Produce vertical pipes, supporting brackets, sliding brackets, fixed parts of fixed brackets, and working platform parts according to design drawings;

[0057] ② Purchase of cages and winches among the outsourced equipment;

[0058] ③Pour the concrete foundation and embed the anchor bolts;

[0059] ④Inspect the quality of various components and purchased equipment to ensure they meet design requirements;

[0060] Step 3: Install the working platform and winch

[0061] At the highest point of the cage's pillars A and the lowest point O Anchor the support bracket with bolts and C Department, F Anchor the sliding bracket and fixed bracket with bolts respectively:

[0062] ②Install two fixed pulleys and a reversing pulley to complete the connection of the wire rope;

[0063] ③The lower end of the vertical pipe is embedded in the concrete foundation by 3cm to 5cm. The vertical pipe is installed and fixed in the support bracket, and the verticality is checked to meet the design requirements;

[0064] ④ Assemble and weld the longitudinal beams, transverse beams, lifting rings, platform steel plates and platform guardrails of the working platform on the ground around the pier. B The vertical pipe sleeve with welded ends is put on the vertical pipe;

[0065] ⑤ Connect the wire rope to the lifting ring, start the winch to lift the longitudinal beam of the working platform B Lift the end to the sliding bracket C At the top height, align the upper end of the diagonal brace with the longitudinal beam B * Bolted and braced at the ends D The vertical pipe sleeve with welded ends is put on the vertical pipe;

[0066] ⑥ Install two clips and spacers on the sliding seat of the sliding bracket and then clamp and secure the vertical pipe with bolts. Install two clips on the fixed seat of the fixed bracket and then clamp and secure the vertical pipe with bolts.

[0067] At this time, the working platform is in the position for installing or removing the clamp. The operator installs or removes the clamp on the working platform and stops the winch.

[0068] Step 4: Install and remove the clamp

[0069] Install the clamp at the predetermined position on the working platform;

[0070] ②Install the cap beam support;

[0071] ③Pour the cap beam formwork, steel bars and concrete. After the concrete strength reaches the design requirements, prestress the concrete. After the cap beam construction is completed, remove the cap beam formwork and cap beam support, and remove the hoop.

[0072] Step 5: Repair or decorate pier surface defects

[0073] Start the winch to raise the working platform 1cm to 2cm, and remove the sliding bracket and fixed bracket;

[0074] ② Lower the working platform to the working position where the pier column surface defects need to be repaired or decorated;

[0075] ③On the longitudinal beam B End and diagonal bracing D Insert the pin into the pin hole on the vertical pipe near the end to fix the working platform and stop the winch;

[0076] ④ Repairing pier column surface defects or spraying decorative paint on the working platform;

[0077] ⑤ This process is repeated until the surface defects of the pier column are repaired or the decorative paint spraying is completed;

[0078] Step 6: Remove the working platform and mobile device and proceed to the related work of the next row of piers and cap beams;

[0079] Dismantle the working platform and mobile device in the reverse order of installation;

[0080] ②Transfer the work platform and mobile device to the next row of piers and continue the work according to steps 3 to 6 until all related work on the piers and cap beams is completed.

[0081] Compared with the prior art, the present invention mainly provides a mobile working platform for bridge piers, which includes a row of multiple piers that have been completed, a concrete foundation poured on the foundation between the row of multiple piers, and a cage. The bottom of the cage is firmly connected to the concrete foundation through anchor bolts. The main feature is that columns close to the piers are provided on the side of the cage. The highest point of the top of the column is A and the lowest point OEach of the plurality of supporting brackets is provided with a vertical pipe having a full length installed in the supporting bracket; a working platform connected to the vertical pipe by a moving device is provided, and the working platform comprises a plurality of longitudinal beams, a plurality of transverse beams, a plurality of diagonal braces and a plurality of lifting rings; the plurality of longitudinal beams and the plurality of transverse beams are welded to each other to form a platform skeleton, and the plurality of longitudinal beams are close to the vertical pipe. B The ends of the braces move up and down on the vertical pipes through multiple vertical pipe sleeves, and the upper ends of the multiple diagonal braces are connected to the other side of the vertical pipe. B * End anchoring, multiple diagonal braces with lower ends close to vertical pipes D The end is also moved up and down on the vertical pipe through multiple vertical pipe sleeves; the center of the working platform is reserved with a platform hole with the same cross-sectional shape as the pier column and for the pier column to pass through; in this way, the working platform can be driven by the moving device to move up and down along the pier column or be fixed at different heights of the pier column by inserting pins into multiple pin holes on the vertical pipe to perform construction operations; at the same time, a sliding bracket and a fixed bracket are installed between the column and the vertical pipe, and a sliding bracket is formed between the sliding bracket and the column. C Anchoring, forming a fixed space between the bracket and the column F The pier is anchored at the right position, and the sliding bracket and the fixed bracket cooperate with the working platform to install and remove the clamps on the pier. The main advantages of the present invention are: first, the working platform can be moved or fixed up and down the entire pier according to the position where the work is required, which is flexible and easy to operate; second, the vertical pipe, sliding bracket and fixed bracket can be set to adjust the force distribution of the vertical pipe and the cage according to the actual force conditions, giving full play to the force characteristics of the vertical pipe and the cage structure, which is particularly suitable for the case of a large-load working platform, with superior performance, safety and reliability; third, the provided calculation and analysis method for the mobile working platform for bridge piers is conducive to guiding the design, production and construction of the mobile working platform. Therefore, the present invention is a mobile working platform for bridge piers with simple structure, convenient construction, low cost, safety, reliability and maneuverability. Combined with the corresponding construction method, it has high economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 It is a schematic elevation diagram of the structure of the present invention.

[0083] Figure 2 for Figure 1 Top view of .

[0084] Figure 3 Schematic diagram of the structure of the support bracket.

[0085] Figure 4 for Figure 3 Top view of .

[0086] Figure 5 Schematic diagram of the structure of the sliding bracket.

[0087] Figure 6 for Figure 5 Top view of .

[0088] Figure 7 A schematic diagram of the structure of the fixed bracket.

[0089] Figure 8 for Figure 7 Top view of .

[0090] Figure 9 This is the diagram for calculating the force on the vertical pipe. DETAILED DESCRIPTION

[0091] The embodiments of the present invention will be described in detail below with reference to the above-mentioned drawings.

[0092] like Figure 1~Figure 9 As shown, 1. pier, 11. clamp, 2. concrete foundation, 3. cage, 31. anchor bolt, 32. ladder cage, 33. cage guardrail, 34. column, 4. working platform, 41. longitudinal beam, 42. cross beam, 43. diagonal brace, 44. platform steel plate, 45. platform guardrail, 46. platform hole, 47. lifting ring, 48. vertical pipe sleeve, 51. supporting bracket, 511. supporting seat, 512. clip, 513. bolt, 52. sliding bracket, 521. sliding seat, 522. spacer, 53. fixed bracket, 531. fixed seat, 6. vertical pipe, 61. pin hole, 7. winch, 71. wire rope, 72. fixed pulley, 73. reversing wheel.

[0093] A mobile working platform for bridge piers and a construction method mainly relate to the field of bridge quality engineering construction. The mobile working platform for bridge piers includes a row of multiple piers 1 that have been completed, a concrete foundation 2 cast on the foundation between the row of multiple piers, and a cage 3 erected. The bottom of the cage is firmly connected to the concrete foundation 2 via anchor bolts 31.

[0094] The pier 1 refers to a completed bridge column. The subsequent work is to install the clamp 11 required for the cap beam support and repair or decorate the surface defects of the pier. The cross-section of the pier is circular, and can also be square or other shapes.

[0095] The concrete foundation 2 is the foundation for installing the enclosure. The concrete foundation needs to be pre-buried with anchor bolts when pouring, and the pre-buried anchor bolts are used to fasten the bottom of the enclosure.

[0096] The clamp 11 is made of steel and is a fastener that surrounds and fastens the pier column to support the construction of the cap beam without a ground bracket. It is removed after the cap beam construction is completed. A safe working platform is required to install and remove the clamp.

[0097] The cage 3 is made of steel and consists of multiple modular units with rectangular frames, including a ladder cage 32 that can be used by operators to go up and down the cage for operations. Multiple modular units are connected and fixed to each other by connectors and installed between a row of multiple piers 1. Each modular unit is a frame structure, a stable structure composed of multiple components such as columns 34, vertical and horizontal bars, diagonal bars, plane grids, vertical safety nets and connectors. A cage guardrail 33 needs to be set on the top of the cage for protection.

[0098] The side of the cage 3 is provided with a column 34 close to the pier 1, and the highest point of the top of the column A and the lowest point O A supporting bracket 51 is provided respectively, and a full-length vertical pipe 6 is installed in the supporting bracket.

[0099] The support bracket 51 is made of steel and includes a support seat 511, two clips 512 on the support seat and a plurality of bolts 513 connecting the two clips; the support seat 511 is anchored at the highest point of the top of the column 34 by bolts. A or the lowest point at the bottom of the column O , the vertical pipe 6 is at the lowest point O Embedded in the concrete foundation 2 3cm ~ 5cm; the two clips 512 clamp the vertical pipe 6 and are clamped and fixed by multiple bolts 513, and the inner diameter of the two clips 512 when clamped is the same as the outer diameter of the vertical pipe 6.

[0100] The vertical pipe 6 is provided with a working platform 4 which is connected to the vertical movable structure by a moving device. The working platform includes a plurality of longitudinal beams 41, a plurality of transverse beams 42, a plurality of diagonal braces 43 and a plurality of lifting rings 47. The plurality of longitudinal beams 41 and the plurality of transverse beams 42 are welded to form a "field" shaped platform skeleton. The plurality of longitudinal beams 41 are close to the side of the vertical pipe 6. B The ends of the plurality of vertical pipe sleeves 48 move up and down on the vertical pipe 6, and the upper ends of the plurality of diagonal braces 43 are connected to the other side of the vertical pipe 6. B * The lower ends of the multiple diagonal braces 43 are close to the vertical pipe 6. D The center of the working platform 4 is reserved with a platform hole 46 having the same cross-sectional shape as the pier 1 and for the pier to pass through.

[0101] At the same time, the working platform 4 is made of steel, and multiple longitudinal beams 41, multiple cross beams 42 and multiple diagonal braces 43 are all steel sections; the platform frame is covered with a platform steel plate 44 by welding or bolt anchoring, and a platform hole 46 is reserved in the center of the platform steel plate 44. The cross-sectional size of the platform hole 46 is 1cm to 2cm larger than the cross-sectional size of the outer edge of the pier 1; the length of the vertical pipe sleeve 48 is 2 to 3 times the outer diameter of the vertical pipe, and the inner diameter is 2mm to 3mm larger than the outer diameter of the vertical pipe 6, and it moves vertically up and down along the vertical pipe; the working platform 4 is surrounded by a platform guardrail 45 welded vertically and horizontally by multiple steel pipes; the top surface of the working platform is provided with multiple lifting rings 47 welded on multiple cross beams 42, each lifting ring is made of round steel bars, and the position center of the multiple lifting rings 47 coincides with the center of gravity of the working platform 4, and the moving device drives the working platform 4 to move up and down along the pier 1. The plane of the working platform 4 moves up and down in a horizontal plane without getting stuck on the outer edge surface of the pier.

[0102] The vertical tube 6 is a hollow steel tube, the wall thickness of which is determined by calculation. The vertical tubes 6 are provided with pin holes in pairs from top to bottom, and the spacing between each pair of pin holes 61 is equal to United States or CF The number of the openings of the latch holes 61 depends on where the working platform needs to operate on the pier column, but the distance between two adjacent latch holes 61 is not less than 30 cm to 50 cm. After the operation of the highest clamp 11 is completed, the latch is inserted into the latch hole 61 so that the working platform 4 can perform operations such as repairing or decorating the pier column surface defects from top to bottom.

[0103] The moving device includes a winch 7, a wire rope 71, a fixed pulley 72 and a reversing wheel 73. The working platform is equipped with two fixed pulleys 72 and a reversing wheel 73, one of which is installed at the line connecting the top of the cage and the center of a row of multiple piers, and the other fixed pulley is installed at the line connecting the bottom of the cage and the center of a row of multiple piers. A reversing wheel 73 is installed at the line connecting the centers of a row of multiple piers between the piers and the vertical pipe 6, and the wire rope 71 connects the lifting ring 47 on the top surface of the working platform 4, the two fixed pulleys 72, the reversing wheel 73 and the winch 7. The winch 7 of the moving device drives the wire rope 71 to drive the working platform 4 to move up and down.

[0104] In this way, the working platform 4 is driven by the moving device to move up and down along the pier 1 or is fixed at different heights of the pier 1 by inserting pins into the multiple pin holes 61 on the vertical pipe 6 to perform construction work.

[0105] In addition, a sliding bracket 52 and a fixed bracket 53 are installed between the column 34 and the vertical pipe 6, and a fixed bracket 53 is formed between the sliding bracket and the column 34. C Anchored at the fixed bracket 53 and the column 34 to form FThe sliding bracket 52 and the fixed bracket 53 cooperate with the working platform 4 to install and remove the hoop 11 on the pier column 1.

[0106] The sliding bracket 52 is made of steel and includes a sliding seat 521, two clips 512 on the sliding seat and a plurality of bolts 513 connecting the two clips; the sliding seat 521 is anchored to the column 34 by bolts. C Department, the C The position depends on the convenience of installation, removal of the clamp or pier surface defect repair and decoration operation; the two clips 512 clamp the vertical pipe 6 and are clamped and fixed by multiple bolts 513. A pad 522 is added to the two clips 512 to leave a gap of 2mm to 3mm with the outer diameter of the vertical pipe 6.

[0107] The fixing bracket 53 is made of steel and includes a fixing seat 531, two clips 512 on the fixing seat and a plurality of bolts 513 connecting the two clips; the fixing seat 531 is anchored to the column 34 by bolts. F Department, the F to C The length is equal to the longitudinal beam of the working platform 4 B End to diagonal brace D the two clips 512 clamp the vertical pipe 6 and are clamped and fixed by a plurality of bolts 513.

[0108] The working platform 4 is at the lowest point of the vertical pipe. O and the highest point A Move between the lowest point of the vertical pipe O The concrete foundation 2 and the support bracket 51 are elastically fixedly connected, and the highest point A Elastic connection by supporting bracket, the forces are and ; Longitudinal beam of working platform 4 B End and diagonal bracing D The ends move up and down on the vertical pipe 6 through the vertical pipe sleeve 48, and the longitudinal beam B End and diagonal bracing D The bottom of the vertical pipe sleeve at the end is respectively C At, fixed bracket 53 F Considering the cage 3 and the vertical pipe 6 for the sake of force balance, the longitudinal beam B The end passes through the sliding bracket C The force is transferred to the cage, and the diagonal support D The end passes through the fixed bracket F The force is transferred to the cage and the vertical pipe together; at the same time, due to the diagonal support D End and fixed bracket F Spacing h 3Small, in order to simplify the calculation, the diagonal brace D Force at the end Move to the fixed bracket F At the top, the fixed bracket 54 F The force at ; The vertical pipe 6 is supported on the elastic support A、F、O The continuous beam with bending on the top, which supports A , support F It is a single elastic tension and compression support. O For elastic consolidation support, according to the elastic theory and the principle of force balance, the following force calculation formula is obtained:

[0109] Formula 1:

[0110] When installing and removing the clamp 11 on the working platform 4, the vertical pipe is subjected to the greatest force. The force on a single vertical pipe is obtained under the most unfavorable conditions. , vertical pipe AF part, FO The differential equations of the compression and bending forces of the segment are

[0111] AF part:

[0112]

[0113] FO part:

[0114]

[0115] Boundary conditions and continuity conditions

[0116]

[0117] The physical equation is

[0118]

[0119] vertical pipe AF part, FO The solution of the differential equation for the segment is

[0120] AF part:

[0121]

[0122] FO part:

[0123]

[0124] In the formula

[0125]

[0126] From this we can understand ;

[0127] Formula 2:

[0128] According to the force equilibrium condition, we have

[0129]

[0130] Formula 3:

[0131]

[0132] Such as vertical pipe FA part, FO When the length of the segment is long, stability needs to be verified;

[0133] The symbols in Formula 1, Formula 2, and Formula 3 are defined as:

[0134] ——Respectively vertical pipe AO part, AF part, FO Segment length and bracing D From the end to the fixed bracket F Length, approximate calculation , ;

[0135] ——With 6 vertical pipes O Start to A The vertical coordinates at and the deformation curve equation of a single vertical pipe, ;

[0136] ——are the coefficients of the deformation curve of a single vertical pipe, ;

[0137] --exist oh my The rigidity of the hollow steel pipe section of a single vertical pipe in the plane is considered after the pin hole weakens. ;

[0138] ——Tensile strength of the sliding bracket 52 and the fixed bracket 53, ;

[0139] ——Respectively single vertical pipe A Department, F The horizontal displacement at ;

[0140] ——Respectively single vertical pipe AHorizontal force at the location, single vertical pipe F Horizontal force at the location, single vertical pipe O The vertical and horizontal forces acting on the location, ;

[0141] ——When installing and removing the clamp 11 on the working platform 4, the single vertical pipe and the diagonal support under the most unfavorable conditions D The moment and vertical force at the end, ;

[0142] ——Single vertical pipe O The consolidation bending moment at ;

[0143] --exist oh my The allowable bending moment of the hollow steel pipe section of a single vertical pipe in the plane after the pin hole is weakened is considered. ;

[0144] --exist oh my The allowable shear force of the hollow steel pipe section of a single vertical pipe in the plane after the pin hole is weakened is considered. .

[0145] The construction method of the bridge pier mobile work platform involved in the utility model mainly includes the following steps:

[0146] Step 1: Determine the structural dimensions of the working platform

[0147] Formulate the structural dimensions, layout and material selection of the working platform according to the height of the pier, working load and work content;

[0148] Calculate and review the structural dimensions, layout, and engineering material selection of the working platform using Formulas 1, 2, and 3;

[0149] ③ Prepare construction organization design documents and organize construction;

[0150] Step 2: Fabrication of vertical pipe 6, supporting bracket 51, sliding bracket 52, fixed bracket 53 and working platform 4, and purchase of cage 3 and winch 7

[0151] Produce the vertical pipe 6, the supporting bracket 51, the sliding bracket 52 and the fixed parts of the fixed bracket 53, as well as the working platform parts according to the design drawings;

[0152] ② Purchase the cage 3 and winch 7 from the purchased equipment;

[0153] ③ pouring the concrete foundation 2 and pre-embedding the anchor bolts 31;

[0154] ④Inspect the quality of various components and purchased equipment to ensure they meet design requirements;

[0155] Step 3: Install the working platform and winch

[0156] At the highest point of the top of the column 34 of the cage 3 A and the lowest point O Anchor the support bracket 51 with bolts and C Department, F Anchor the sliding bracket 52 and the fixed bracket 53 with bolts respectively:

[0157] ② Install two fixed pulleys 72 and a reversing pulley 73 to complete the connection of the wire rope 71;

[0158] ③ The lower end of the vertical pipe 6 is embedded in the concrete foundation 2 by 3cm to 5cm. The vertical pipe 6 is installed and fixed in the support bracket 51, and the verticality is checked to meet the design requirements;

[0159] ④ Assemble and weld the longitudinal beams 41, transverse beams 42, lifting rings 47, platform steel plates 44 and platform guardrails 45 of the working platform 4 on the ground around the pier 1. B The vertical pipe sleeve 48 with welded ends is sleeved on the vertical pipe;

[0160] ⑤ Connect the wire rope 71 to the lifting ring 47, start the winch 7 to lift the longitudinal beam of the working platform 4 B The end is lifted to the sliding bracket 52 C At the top height, align the upper end of the diagonal brace 43 with the longitudinal beam B * The ends are fixed with bolts and braced with 43 D The vertical pipe sleeve with welded ends is put on the vertical pipe;

[0161] ⑥ Install two clips 512 and a spacer 522 on the sliding seat 521 of the sliding bracket 52, and then clamp and secure the vertical pipe 6 with bolts 513. Install two clips 512 on the fixing seat 531 of the fixing bracket 53, and then clamp and secure the vertical pipe 6 with bolts 513;

[0162] At this time, the working platform 4 is in the position for installing or removing the clamp 11. The operator installs or removes the clamp 11 on the working platform 4 and stops the winch 7.

[0163] Step 4: Install and remove the clamp

[0164] Install the clamp 11 at a predetermined position on the working platform 4;

[0165] ②Install the cap beam support;

[0166] ③Pour the cap beam formwork, steel bars, and concrete. After the concrete strength reaches the design requirements, prestress the concrete. After the cap beam construction is completed, remove the cap beam formwork and cap beam support, and remove the hoop 11;

[0167] Step 5: Repair or decorate pier surface defects

[0168] Start the winch 7 to raise the working platform by 1 cm to 2 cm, and remove the sliding bracket 52 and the fixed bracket 53;

[0169] ② Lower the working platform 4 to the working position where the pier column surface defects need to be repaired or decorated;

[0170] ③On the longitudinal beam B End and diagonal bracing D Insert the pin into the pin hole on the vertical pipe near the end to fix the working platform and stop the winch;

[0171] ④ Repairing pier column surface defects or spraying decorative paint on working platform 4;

[0172] ⑤ This process is repeated until the surface defects of the pier column are repaired or the decorative paint spraying is completed;

[0173] Step 6: Remove the working platform 4 and the moving device and proceed to the related operations of the next row of piers 1 and cap beams;

[0174] Dismantle in reverse order of installing the working platform 4 and the moving device;

[0175] ②Transfer the working platform 4 and the mobile device to the next row of piers, and continue the work according to steps 3 to 6 until all the related operations of the piers and cap beams are completed.

[0176] The embodiments described in the present invention are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. It should also be understood that, after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Claims

1. A mobile working platform for bridge piers, comprising a row of multiple piers (1) that have been constructed, a concrete foundation (2) cast on the foundation between the row of multiple piers, and a cage (3) erected, wherein the bottom of the cage is firmly connected to the concrete foundation (2) via anchor bolts (31), and is characterized in that The side of the cage (3) is provided with a column (34) close to the pier (1), and the highest point of the top of the column A and the lowest point O A supporting bracket (51) is provided, and a vertical pipe (6) is installed in the supporting bracket; a working platform (4) is provided on the vertical pipe, which is driven by a moving device to form an up and down movable connection, and the working platform includes multiple longitudinal beams (41), multiple cross beams (42), multiple diagonal braces (43) and multiple lifting rings (47); the multiple longitudinal beams (41) and the multiple cross beams (42) are welded to form a platform skeleton, and the multiple longitudinal beams (41) are close to the side of the vertical pipe (6). B The ends of the vertical pipes (48) move up and down on the vertical pipes (6), and the upper ends of the plurality of diagonal braces (43) are connected to the other side of the vertical pipe (6). B * End anchoring, multiple diagonal braces (43) with lower ends close to vertical pipes (6) D The end of the work platform (4) is also moved up and down on the vertical pipe (6) through multiple vertical pipe sleeves (48); the center of the work platform (4) is reserved with a platform hole (46) with the same cross-sectional shape as the pier column (1) and for the pier column to pass through; the work platform (4) is driven by the moving device to move up and down along the pier column (1) or is fixed at different heights of the pier column (1) by inserting pins into multiple pin holes (61) on the vertical pipe (6) to perform construction operations; a sliding bracket (52) and a fixed bracket (53) are installed between the column (34) and the vertical pipe (6), and a sliding bracket (52) and a fixed bracket (53) are formed between the sliding bracket (52) and the column (34). C Anchored at the position, a fixed bracket (53) and a column (34) are formed between the fixed bracket (53) and the column (34) F The sliding bracket (52) and the fixed bracket (53) cooperate with the working platform (4) to install and remove the hoop (11) on the pier column (1); the longitudinal beam of the working platform (4) B End and diagonal bracing D The ends are respectively moved up and down on the vertical pipe (6) through the vertical pipe sleeve (48), and the longitudinal beam B End and diagonal bracing D The bottom of the vertical pipe sleeve at the end is respectively provided with a sliding bracket (52) C At the fixed bracket (53) F The sliding bracket (52) is made of steel and comprises a sliding seat (521), two clips (512) on the sliding seat and a plurality of bolts (513) connecting the two clips; the sliding seat (521) is anchored to the column (34) by bolts. C Department, the C The position of the fixing bracket is determined by the convenience of installing and removing the clamp or repairing and decorating the surface defects of the pier column; the two clips (512) clamp the vertical pipe (6) and are clamped and fixed by multiple bolts (513), and the two clips (512) are added with a spacer (522) to retain a gap of 2mm to 3mm with the outer diameter of the vertical pipe (6); the fixing bracket (53) is made of steel, and the fixing bracket includes a fixing seat (531), two clips (512) on the fixing seat and multiple bolts (513) connecting the two clips; the fixing seat (531) is anchored to the column (34) by bolts F Department, the F Chuzhi C The length of the work platform (4) is equal to the longitudinal beam B End to diagonal brace D The two clips (512) clamp the vertical pipe (6) and are clamped and fixed by multiple bolts (513).

2. A bridge pier mobile work platform according to claim 1, characterized in that The working platform (4) is at the lowest point of the vertical pipe. O and the highest point A The lowest point of the vertical pipe O The concrete foundation (2) and the support bracket (51) are elastically fixedly connected, and the highest point A Elastic connection by supporting bracket, the forces are and ; Considering the balanced force on the cage (3) and the vertical pipe (6), the longitudinal beam B The end passes through the sliding bracket C The force is transferred to the cage, and the diagonal support D The end passes through the fixed bracket F The force is transferred to the cage and the vertical pipe together; at the same time, due to the diagonal support D End and fixed bracket F Spacing h 3 Small, in order to simplify the calculation, the diagonal brace D Force at the end Move to the fixed bracket F At the top, the fixed bracket (53) F The force at ; Use the vertical pipe (6) as a support on the elastic support A, F, O The continuous beam with bending on the top, which supports A , support F It is a single elastic tension and compression support. O For elastic consolidation support, according to the elastic theory and the principle of force balance, the following force calculation formula is obtained: Formula 1: When installing and removing the clamp (11) on the working platform (4), the vertical pipe is subjected to the greatest force. The force on a single vertical pipe is obtained under the most unfavorable conditions. , vertical pipe AF part, FO The differential equations of the compression and bending forces of the segment are AF part: FO part: Boundary conditions and continuity conditions The physical equations are vertical pipe AF part, FO The solution of the differential equation for the segment is AF part: FO part: In the formula From this we can understand ; Formula 2: From the force equilibrium condition, we get Formula 3: Such as vertical pipe FA part, FO When the length of the segment is long, stability needs to be verified; The definitions of each symbol in Formula 1, Formula 2 and Formula 3 are as follows: ——Respectively vertical pipe AO part, AF part, FO Segment length and bracing D From the end to the fixed bracket F Length, approximate calculation , ; ——At the vertical pipe (6) O Start to A The vertical coordinates at and the deformation curve equation of a single vertical pipe, ; ——are the coefficients of the deformation curve of a single vertical pipe, ; --exist xoy The rigidity of the hollow steel pipe section of a single vertical pipe in the plane is considered after the pin hole weakens. ; ——the tensile strength of the sliding bracket (52) and the fixed bracket (53), ; ——Respectively single vertical pipe A Department, F The horizontal displacement at ; ——Respectively single vertical pipe A Horizontal force at the location, single vertical pipe F Horizontal force at the location, single vertical pipe O The vertical and horizontal forces acting on the location, ; ——When installing and removing the clamp (11) on the working platform (4), the single vertical pipe and the diagonal support under the most unfavorable conditions D The moment and vertical force at the end, ; ——Single vertical pipe O The consolidation bending moment at ; --exist xoy The allowable bending moment of the hollow steel pipe section of a single vertical pipe in the plane after the pin hole is weakened is considered. ; --exist xoy The allowable shear force of the hollow steel pipe section of a single vertical pipe in the plane after the pin hole is weakened is considered. .

3. A bridge pier mobile work platform according to claim 1, characterized in that The working platform (4) is made of steel. Multiple longitudinal beams (41), multiple cross beams (42) and multiple diagonal braces (43) are all profiled steels. The multiple longitudinal beams (41) and multiple cross beams (42) are welded to each other to form a "field" - shaped platform skeleton. A platform steel plate (44) is covered on this platform skeleton by welding or bolt anchoring. The platform hole (46) is reserved in the center of the platform steel plate (44). The cross - sectional dimension of the platform hole (46) is 1 cm - 2 cm larger than the outer - edge cross - sectional dimension of the pier column (1). The length of the vertical pipe sleeve (48) is 2 - 3 times the outer diameter of the vertical pipe (6), and the inner diameter is 2 mm - 3 mm larger than the outer diameter of the vertical pipe, and it moves vertically up and down along the vertical pipe (6). The working platform (4) is surrounded by a platform guardrail (45) formed by welding multiple steel pipes vertically and horizontally around. The top surface of the working platform (4) is provided with multiple lifting rings (47) welded on multiple cross beams (42). Each lifting ring is made of round steel. The center of the positions of the multiple lifting rings (47) coincides with the center of gravity of the working platform (4). And the moving device drives the working platform (4) to move up and down along the pier column (1). The plane of the working platform (4) moves up and down in a horizontal plane without jamming the outer - edge surface of the pier column (1).

4. The bridge pier mobile work platform according to claim 1, characterized in that The support bracket (51) is made of steel and includes a support seat (511), two clips (512) on the support seat, and a plurality of bolts (513) connecting the two clips; the support seat (511) is anchored to the highest point of the top of the column (34) by bolts. A or the lowest point at the bottom of the column O , the vertical pipe (6) is at the lowest point O Embedded in the concrete foundation (2) by 3cm to 5cm; the two clips (512) clamp the vertical pipe (6) and are clamped and fixed by a plurality of bolts (513), and the inner diameter of the two clips (512) when clamped is the same as the outer diameter of the vertical pipe (6).

5. The bridge pier mobile work platform according to claim 1, characterized in that The vertical tube (6) is a hollow steel tube, the wall thickness of which is determined by calculation. The plurality of vertical tubes (6) are provided with pin holes (61) in pairs from top to bottom, and the spacing between each pair of pin holes is equal to BD or CF The length of the latch hole (61) is determined by the number of holes of the working platform (4) depending on where the work is required on the pier (1), but the distance between two adjacent latch holes (61) is not less than 30cm to 50cm.

6. The bridge pier mobile work platform according to claim 1, characterized in that The moving device includes a winch (7), a steel wire rope (71), a fixed pulley (72) and a reversing pulley (73). The working platform (4) is equipped with two fixed pulleys (72) and one reversing pulley (73). One fixed pulley is installed at the connection line between the top of the cage (3) and the center of a row of multiple pier columns (1). The other fixed pulley is installed at the connection line between the bottom of the cage (3) and the center of a row of multiple pier columns (1). One reversing pulley (73) is installed at the connection line between the pier column (1) and the vertical pipe (6) at the center of a row of multiple pier columns. And the lifting ring (47) on the top surface of the working platform (4), two fixed pulleys (72), one reversing pulley (73) and the winch (7) are connected through the steel wire rope (71). The winch (7) of the moving device drives the steel wire rope (71) to drive the up - and - down movement of the working platform (4).

7. The bridge pier mobile work platform according to claim 1, characterized in that The cage (3) is made of steel and is composed of multiple modular units of rectangular frames. Each modular unit is a stable structure jointly composed of columns (34), horizontal and vertical bars, diagonal bars, plane grids, vertical safety nets and connectors. And multiple modular units are connected and fixed to each other with connectors and installed between a row of multiple pier columns. A cage guardrail (33) is set on the top of the cage.

8. A construction method for a bridge pier mobile work platform according to claim 2, characterized in that The construction method includes the following steps: Step 1. Determine the structural dimensions of the working platform ① Determine the structural dimensions, layout forms and select materials of the working platform according to the height of the pier column (1), working load and working content; ② Calculate and review the structural dimensions, layout, and engineering material selection of the working platform using Formulas 1, 2, and 3; ③ Prepare construction organization design documents and organize construction; Step 2: Fabrication of vertical pipes, support brackets, sliding brackets, fixed brackets and working platforms, and purchase of cages and winches ① According to the design drawings, the vertical pipe (6), the supporting bracket (51), the sliding bracket (52) and the fixed parts of the fixed bracket (53), as well as the working platform parts are manufactured; ② Purchase the cage (3) and winch (7) among the outsourced equipment; ③ Casting the concrete foundation (2) and pre-embedded anchor bolts (31); ④Inspect the quality of various components and purchased equipment to ensure they meet design requirements; Step 3: Install the working platform and winch ① At the highest point of the top of the column (34) of the cage (3) A and the lowest point O Anchor the support bracket (51) with bolts and C Department, F Anchor the sliding bracket (52) and the fixed bracket (53) with bolts respectively: ② Install two fixed pulleys (72) and a reversing pulley (73) to complete the connection of the wire rope (71); ③ The lower end of the vertical pipe (6) is embedded in the concrete foundation by 3cm to 5cm, and the vertical pipe is fixed in the support bracket (51), and the verticality is checked to meet the design requirements; ④ Assemble and weld the longitudinal beams (41), transverse beams (42), lifting rings (47), platform steel plates (44) and platform guardrails (45) of the working platform (4) on the ground around the pier (1). The longitudinal beams on the side close to the vertical pipe (6) are welded. B The vertical pipe sleeve (48) with a welded end is sleeved on the vertical pipe (6); ⑤ Connect the wire rope (71) to the lifting ring (47), start the winch (7) to lift the longitudinal beam of the working platform (4) B Lift the end to the sliding bracket (52) C At the top height, align the upper end of the diagonal brace (43) with the longitudinal beam. B * The ends are fixed with bolts and braced with diagonal braces (43). D The vertical pipe sleeve (48) with a welded end is sleeved on the vertical pipe (6); ⑥ Install two clips (512) and a spacer (522) on the sliding seat (521) of the sliding bracket (52), and then clamp and fix the vertical pipe (6) with bolts (513); install two clips (512) on the fixed seat (531) of the fixed bracket (53), and then clamp and fix the vertical pipe (6) with bolts (513); ⑦ At this time, the working platform (4) is in the position for installing or removing the clamp (11), and the operator installs or removes the clamp on the working platform and stops the operation of the winch (7); Step 4: Install and remove the clamp ① Install the clamp (11) at a predetermined position on the working platform (4); ②Install the cap beam support; ③Pour the cap beam formwork, steel bars and concrete. After the concrete strength reaches the design requirements, prestress the concrete. After the cap beam construction is completed, remove the cap beam formwork and cap beam support, and remove the hoop. Step 5: Repair or decorate pier surface defects ① Start the winch (7) to raise the working platform by 1 cm to 2 cm, and remove the sliding bracket (52) and the fixed bracket (53); ② Lower the working platform (4) to the working position where the pier column surface defects need to be repaired or decorated; ③On the longitudinal beam B End and diagonal bracing D Insert a pin into the pin hole (61) on the vertical pipe (6) adjacent to the end to fix the working platform and stop the winch; ④ Repairing the surface defects of the pier or spraying decorative paint on the working platform (4); ⑤ This process is repeated until the surface defects of the pier column are repaired or the decorative paint spraying is completed; Step 6: Remove the working platform and mobile device and proceed to the related work of the next row of piers and cap beams; ① Dismantle the working platform (4) and the mobile device in the reverse order of installation; ②Transfer the working platform (4) and the mobile device to the next row of piers and continue the work according to steps 3 to 6 until all the related work on the piers and cap beams is completed.

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