Long-line-method pre-tensioned steel strand bogie
By designing a pre-tall steel strand bogie for long-line construction, the problems of high cost, low efficiency and large prestress losses in traditional construction are solved, and the smooth transition of steel strands is achieved, reducing friction resistance and prestress losses are reduced, and construction efficiency and safety are improved.
Patent Information
- Application Number
- CN202420584379.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-25
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-03-25
AI Technical Summary
In large beam fields, the construction cost of traditional folded linear steel strand wire pretension method is high and has low efficiency. In long-line construction, the transition problem of steel strand wire leads to large friction resistance and serious prestress losses.
A long-line method is designed to first-line steel stranded bogie, including a base, support structure and steering structure. Through multiple rows of rotatable wheel axles and U-shaped groove rollers in the steering structure, the smooth transition of the steel strand from the tail end of the front beam to the beginning end of the rear beam is achieved.
This bogie can reduce the number of tension bearing frames, reduce friction resistance, reduce prestress losses, save engineering costs, improve construction efficiency, and ensure construction safety.
Smart Images
Figure CN222758718U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of prestressed construction, in particular to a long-line pre-tensioned steel strand bogie. Background Art
[0002] There are two processes for the construction of zigzag prestressed steel strands for long-span bridges: pre-tensioning and post-tensioning. The post-tensioning method is to pour concrete first and then tension the steel strands, while the pre-tensioning method is to tension the steel strands first and then pour concrete. In the traditional zigzag steel strand pre-tensioning method, a tensioning frame needs to be set at each end of the precast beam to bear the prestress applied by the zigzag pre-tensioned steel strands. However, for large beam yards with a large number of precast beams, this method is costly and inefficient.
[0003] In order to improve the efficiency of tensioning construction and save construction costs, people arrange multiple prefabricated beams longitudinally on an axis with tensioning frames at both ends, which is called long-line construction. This long-line construction method can save the number of tensioning frames, save costs, and improve efficiency; but due to the existence of the upward bent steel strands in the broken line prestressing, when setting up the long-line construction pedestal, it is urgent to develop a bogie between the two pedestals so that the prestressed steel strands can smoothly transition from the tail end of the front beam to the beginning of the rear beam, thereby reducing the tensioning frames, reducing friction, and reducing prestress loss. Summary of the invention
[0004] The utility model aims to provide a long-line pre-tensioned steel strand bogie which can save engineering cost, improve construction efficiency and ensure construction safety. The main function of the bogie is to support the steel strand to the designed position so that the steel strand can smoothly transition from the tail end of the front beam to the beginning end of the rear beam, thereby reducing the tensioning load-bearing frame, reducing frictional resistance and reducing prestress loss.
[0005] The purpose of the utility model is achieved in this way:
[0006] A long-line pre-tensioned steel strand bogie, characterized by comprising a base, a support structure and a steering structure, wherein:
[0007] The base is composed of 2 horizontal beams and 4 longitudinal beams to form a frame structure. 2 identical horizontal beams are placed in parallel vertically, and 4 identical longitudinal beams are placed in parallel horizontally. 2 horizontal beams are fixed at both ends of the 4 longitudinal beams respectively. The 4 longitudinal beams are perpendicular to the 2 horizontal beams and placed in parallel between the 2 horizontal beams. The spacing between the 4 longitudinal beams is evenly distributed.
[0008] The supporting structure includes columns and connecting pipes. Two identical columns are vertically spaced apart. The lower ends of the two columns are fixed on the middle of the two longitudinal beams in the middle of the base. The middle and lower parts between the two columns are horizontally connected by connecting pipes. A row of horizontal axle holes for the axles to pass through are arranged on the long sides along the vertical axis of the column from top to bottom.
[0009] The steering structure is a multi-row rotatable structure composed of a plurality of wheel axles and a plurality of U-shaped groove rollers. The steering structure is arranged between two columns and above the connecting pipe. The plurality of wheel axles are arranged horizontally up and down. The diameter of the roller is perpendicular to the direction of the wheel axle. A plurality of parallel U-shaped groove rollers are arranged on each wheel axle. The U-shaped grooves are arranged in a plane position at the thickness center of the U-shaped groove roller along the circumferential direction. Each U-shaped groove roller allows one steel strand to pass through the U-shaped groove.
[0010] Furthermore, the supporting structure also includes a partition plate, which is composed of a vertical partition plate and a transverse partition plate. The vertical partition plate is used for vertically separating and supporting the left and right adjacent U-shaped groove rollers, and is arranged between two upper and lower adjacent transverse partition plates or above the highest transverse partition plate; a transverse partition plate is arranged between every two rows of U-shaped groove rollers, which is used for separating the upper and lower adjacent U-shaped groove rollers, and the transverse partition plate is arranged horizontally and parallelly on the inner side of two columns; the vertical partition plates and the transverse partition plates are fixed together to form a frame structure; the vertical partition plates are provided with horizontal axle holes at positions corresponding to the columns to facilitate the horizontal passage of the axles.
[0011] Furthermore, the supporting structure also includes oblique supports, which are divided into two types: long rod oblique supports in the front and rear directions and short rod oblique supports in the left and right directions. The upper ends of the long rod oblique supports in the front and rear directions are fixed to the upper parts of the vertical columns, and the lower ends of the long rod oblique supports are connected to the cross beams of the base; the upper and lower ends of the short supports in the left and right directions are respectively connected to the lower parts of the vertical columns and the longitudinal beams of the base to ensure the stability of the entire bogie after being subjected to force.
[0012] Furthermore, the long side of the column section is placed along the length direction of the steel strand, and the hole spacing between adjacent wheel axle holes is equal to the designed spacing of the steel strand.
[0013] Furthermore, the axle is made of 45# steel rod; the left side of the axle is an axle cap, and a pin hole is provided at the left side of the right end of the axle perpendicular to the axial direction of the axle for inserting a steel pin to prevent the axle from shifting and falling off.
[0014] Furthermore, the material of the U-shaped groove roller is MGB nylon, and the U-shaped groove needs to accommodate more than 2 / 3 of the cross-sectional area of the steel strand; both sides of the U-shaped groove are hollowed out.
[0015] Furthermore, the columns, the diagonal supports, the connecting pipes, the cross beams and the longitudinal beams of the base are all made of square tubes with the same specifications, and the partitions are made of steel plates.
[0016] The utility model is composed of a steering structure, a supporting structure and a base, and is placed between the pedestals of two longitudinal prefabricated beams. Its main function is to support the steel strands to the designed position, so that the prestressed steel strands can smoothly transition from the tail end of the front beam to the beginning end of the rear beam, thereby reducing the tensioning end, reducing frictional resistance, and reducing prestress loss.
[0017] The utility model also has the following advantages:
[0018] 1. The bogie is used for long-line construction and is set between the pedestals of two longitudinal prefabricated beams, which can save engineering costs, improve construction efficiency and ensure construction safety;
[0019] 2. Fix the position of the steel strand;
[0020] 3. Bear the vertical force generated when the steel strand turns;
[0021] 4. Reduce the prestress loss during the tensioning process of steel strands;
[0022] 5. Simple structure, easy processing, convenient operation, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a schematic diagram of the installation position of the utility model;
[0024] Figure 2 It is a three-dimensional diagram of the utility model;
[0025] Figure 3 It is a front view and a cross-sectional schematic diagram of the utility model;
[0026] Figure 4 It is a side view of the utility model;
[0027] Figure 5 for Figure 3 A top view of
[0028] Figure 6 is a cross-sectional schematic diagram of a steering wheel;
[0029] Figure 7 It is a schematic diagram of the steering axle;
[0030] Figure 8 is a schematic diagram of a partition plate;
[0031] In the figure: 1. precast beam; 11. zigzag steel strand; 12. straight steel strand; 2. bogie; 3. steering structure; 31. axle; 311. axle cap; 312. pin hole; 313. axle hole; 32. roller; 321. U-shaped groove; 4. supporting structure; 41. column; 42. oblique support; 421. long rod oblique support; 422. short rod oblique support; 43. partition; 431. vertical partition; 432. horizontal partition; 44. connecting pipe; 5. base; 51. crossbeam; 52. longitudinal beam. DETAILED DESCRIPTION
[0032] The present invention will be further described in detail below in conjunction with the embodiments and with reference to the accompanying drawings.
[0033] A long-line pre-tensioned steel strand bogie comprises a base 5, a support structure 4 and a steering structure 3, wherein:
[0034] The base 5 is composed of two cross beams 51 and four longitudinal beams 52 to form a frame structure. Two identical cross beams 51 are placed in parallel up and down, and four identical longitudinal beams 52 are placed in parallel left and right. The two cross beams 51 are respectively fixed at both ends of the four longitudinal beams 52. The four longitudinal beams 52 are perpendicular to the two cross beams 51 and placed in parallel between the two cross beams 51. The spacing between the four longitudinal beams 52 is evenly distributed.
[0035] The support structure 4 is composed of a column 41, an oblique support 42, a partition plate 43 and a connecting pipe 44. Two identical columns 41 are placed vertically at intervals. The lower ends of the two columns 41 are fixed on the middle of the two longitudinal beams 52 in the middle of the base 5. The middle and lower parts between the two columns 41 are horizontally connected by a connecting pipe 44. A row of horizontal axle holes 313 for the axle 31 to pass through are arranged on the long side along the vertical axis of the column 41 from top to bottom. The oblique support 42 is divided into a front and rear direction. There are two types of long rod oblique supports 421 and short rod oblique supports 422 in the left and right directions. The upper end of the long rod oblique supports 421 in the front and rear directions is fixed at the upper 1 / 3 length position of the vertical column 41, and the lower end of the long rod oblique supports 421 is connected to the cross beam 51 of the base 5; the upper and lower ends of the short supports 422 in the left and right directions are connected to the lower part of the vertical column 41 and the longitudinal beam 52 of the base 5 in a 450 direction, respectively, to ensure the stability of the entire bogie after being subjected to force.
[0036] The steering structure 3 is a multi-row rotatable structure composed of 7 wheel axles 31 and 21 U-shaped groove rollers 32. The steering structure 3 is arranged between two columns 41 and above the connecting pipe 44. The 7 wheel axles 31 are arranged horizontally up and down. The diameter of the roller 32 is perpendicular to the direction of the wheel axle 31. Three parallel U-shaped groove rollers 32 are arranged on each wheel axle 31. The U-shaped groove 321 is arranged in a plane position at the thickness center of the U-shaped groove roller 32 along the circumferential direction. Each U-shaped groove roller 32 allows one steel strand 11 to pass through the U-shaped groove 321.
[0037] The long side of the cross section of the column 41 is placed along the length direction of the steel strand 11, the hole spacing of adjacent axle holes 313 is equal to the designed spacing of the steel strand, and the hole diameter of the axle hole 313 is 27 mm.
[0038] The partition plate 43 is composed of a vertical partition plate 431 and a transverse partition plate 432. The vertical partition plate 431 is used for vertically partitioning and supporting the left and right adjacent U-shaped groove rollers 32, and is arranged between two upper and lower adjacent transverse partition plates 432 or above the highest transverse partition plate 432; a transverse partition plate 432 is arranged between every two rows of U-shaped groove rollers 32, and is used for partitioning the upper and lower adjacent U-shaped groove rollers 32, and the transverse partition plate 432 is arranged horizontally on the inner side of the two columns 41; the vertical partition plates 431 and the transverse partition plates 432 are fixed together to form a frame structure; the vertical partition plate 431 is provided with a horizontal axle hole 313 at a position corresponding to the column 41 for facilitating the horizontal passage of the axle 31.
[0039] The wheel axle 31 has a circular cross-section and a diameter of 25 mm and is made of 45# steel rod; the left side of the wheel axle 31 is a shaft cap 311, the diameter of the shaft cap 311 is 30 mm, the thickness of the shaft cap 311 is 5 mm, the left and right edges of the shaft cap 311 are chamfered 450 degrees, and the depth of the chamfer is 0.5 mm; the right side of the wheel axle 31 has a 450 degree chamfer along the edge of the end section, and the depth of the chamfer is 0.5 mm; a pin hole 312 is provided perpendicular to the axial direction of the wheel axle 31 at a position 5 mm to the left of the right end of the wheel axle 31, and the aperture of the pin hole 312 is 4 mm, which is used to insert a steel pin to prevent the wheel axle 31 from shifting and falling off.
[0040] The material of the U-shaped groove roller 32 is MGB nylon, the diameter of the U-shaped groove roller 32 does not exceed 61mm, and the thickness of the U-shaped groove roller 32 does not exceed 45mm; the U-shaped groove 321 needs to accommodate more than 2 / 3 of the cross-sectional area of the steel strand 11; wherein, the opening width of the U-shaped groove 321 is not less than 18mm, the depth is not less than 13mm, and the bottom is a semicircle with a radius of not less than 8mm; the two sides of the U-shaped groove 321 are hollowed out, and the diameter of the two ends of the roller 32 after hollowing out is not less than 40mm, and the wall thickness on both sides of the opening of the U-shaped groove 321 is not less than 5mm.
[0041] The upright column 41, the oblique support 42, the connecting pipe 44, the cross beam 51 and the longitudinal beam 52 of the base 5 are all made of square tubes with the same specifications. The partition plate 43 is made of a steel plate with a thickness of 10 mm.
[0042] It should be noted that: the principles and implementation methods of the utility model are described in this specification using specific examples. The description of the above embodiments is only used to help understand the method and core idea of the utility model; at the same time, for those skilled in the art, according to the idea of the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.
Claims
1. A long-line pre-tensioned steel strand bogie, characterized in that: It includes a base, a supporting structure and a steering structure, wherein: The base is composed of 2 horizontal beams and 4 longitudinal beams to form a frame structure. 2 identical horizontal beams are placed in parallel vertically, and 4 identical longitudinal beams are placed in parallel horizontally. 2 horizontal beams are fixed at both ends of the 4 longitudinal beams respectively. The 4 longitudinal beams are perpendicular to the 2 horizontal beams and placed in parallel between the 2 horizontal beams. The spacing between the 4 longitudinal beams is evenly distributed. The supporting structure includes columns and connecting pipes. Two identical columns are vertically spaced apart. The lower ends of the two columns are fixed on the middle of the two longitudinal beams in the middle of the base. The middle and lower parts between the two columns are horizontally connected by connecting pipes. A row of horizontal axle holes for the axles to pass through are arranged on the long sides along the vertical axis of the column from top to bottom. The steering structure is a multi-row rotatable structure composed of a plurality of wheel axles and a plurality of U-shaped groove rollers. The steering structure is arranged between two columns and above the connecting pipe. The plurality of wheel axles are arranged horizontally up and down. The diameter of the roller is perpendicular to the direction of the wheel axle. A plurality of parallel U-shaped groove rollers are arranged on each wheel axle. The U-shaped grooves are arranged in a plane position at the thickness center of the U-shaped groove roller along the circumferential direction. Each U-shaped groove roller allows one steel strand to pass through the U-shaped groove.
2. The long-line pre-tensioned steel strand bogie according to claim 1, characterized in that: The supporting structure also includes a partition plate, which is composed of a vertical partition plate and a transverse partition plate. The vertical partition plate is used for vertically partitioning and supporting the left and right adjacent U-shaped groove rollers, and is arranged between two upper and lower adjacent transverse partition plates or above the highest transverse partition plate; a transverse partition plate is arranged between every two rows of U-shaped groove rollers, which is used for partitioning the upper and lower adjacent U-shaped groove rollers, and the transverse partition plate is arranged horizontally and parallelly on the inner side of two columns; the vertical partition plates and the transverse partition plates are fixed together to form a frame structure; the vertical partition plates are provided with horizontal axle holes at positions corresponding to the columns to facilitate the horizontal passage of the axles.
3. The long-line pre-tensioned steel strand bogie according to claim 1 or 2, characterized in that: The supporting structure also includes oblique supports, which are divided into two types: long rod oblique supports in the front-to-back direction and short rod oblique supports in the left-to-right direction. The upper ends of the long rod oblique supports in the front-to-back direction are fixed to the upper parts of the vertical columns, and the lower ends of the long rod oblique supports are connected to the crossbeams of the base; the upper and lower ends of the short supports in the left-to-right direction are respectively connected to the lower parts of the vertical columns and the longitudinal beams of the base.
4. The long-line pre-tensioned steel strand bogie according to claim 1, characterized in that: The long side of the column section is placed along the length direction of the steel strand, and the hole spacing between adjacent axle holes is equal to the designed spacing of the steel strand.
5. The long-line pre-tensioned steel strand bogie according to claim 1, characterized in that: The axle is made of 45# steel rod; the left side of the axle is the axle cap, and a pin hole is provided on the left side of the right end of the axle, perpendicular to the axial direction of the axle, for inserting a steel pin to prevent the axle from shifting and falling off.
6. The long-line pre-tensioned steel strand bogie according to claim 1, characterized in that: The material of the U-shaped groove roller is MGB nylon. The U-shaped groove needs to accommodate more than 2 / 3 of the cross-sectional area of the steel strand; both sides of the U-shaped groove are hollowed out.
7. The long-line pre-tensioned steel strand bogie according to claim 1, characterized in that: The columns, diagonal supports, connecting pipes, cross beams and longitudinal beams of the base are all made of square tubes with the same specifications, and the partition plates are made of steel plates.