High-speed railway prestressed box girder reinforcing steel bar workshop and longitudinal full-length reinforcing steel bar machining platform
By designing a "I"-shaped layout for the high-speed railway prestressed box girder steel reinforcement workshop and longitudinal continuous reinforcement processing platform, the problems of low safety, high transportation costs, and poor process connection in traditional workshop layouts have been solved, achieving efficient assembly line operation and low-cost steel reinforcement processing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RAILWAY NO 3 GRP CO LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-05-01
AI Technical Summary
Traditional steel bar processing workshop layouts suffer from problems such as low safety, high transportation costs, high labor intensity for workers, and poor workflow coordination.
A prestressed box girder reinforcement workshop for high-speed railway is designed with a "I"-shaped layout, including a first area and a second area. The first area is for raw material storage and semi-finished product processing, while the second area is equipped with fixed binding jigs. A bridge crane can travel to the binding jigs for operation. The beam fabrication platforms are arranged in a "I" shape to realize assembly line operation. Simultaneously, a longitudinal continuous reinforcement processing platform is provided, employing liftable wedge blocks and a traveling frame to achieve batch laying, staggered splicing, and transfer of longitudinal continuous reinforcement.
It improves the efficiency of the steel bar processing assembly line, reduces construction costs, reduces labor demand, improves processing and transportation efficiency, and enhances construction safety and space utilization.
Smart Images

Figure CN224181971U_ABST
Abstract
Description
A steel reinforcement workshop and longitudinal continuous bar processing platform for high-speed railway prestressed box girder Technical Field
[0001] This utility model relates to the field of prestressed box girder reinforcement construction technology; specifically, this utility model relates to a prestressed box girder reinforcement workshop and longitudinal continuous reinforcement processing platform for high-speed railways. Background Technology
[0002] Currently, the traditional and common layouts for steel bar processing workshops are the "parallel" and "L"-shaped steel bar workshops. "Parallel" steel bar workshops: The steel bar workshop and beam fabrication area are arranged in parallel. A large amount of labor is needed to handle the semi-finished steel bars. Typically, the steel bar processing workshop and the binding jigs are separated by a main road, resulting in low safety, high handling costs, and high labor intensity for workers. "L"-shaped steel bar workshops: The steel bar workshop and beam fabrication area are arranged in an "L" shape. This results in higher costs, less smooth process coordination, and a large amount of labor is needed for the processing and handling of long, distributed steel bars. Summary of the Invention
[0003] In view of this, the present invention provides a prestressed box girder steel reinforcement workshop and longitudinal continuous reinforcement processing platform for high-speed railways, thereby solving or at least alleviating the above-mentioned problems existing in the prior art.
[0004] To achieve the aforementioned objectives, the first aspect of this utility model provides a prestressed box girder steel reinforcement workshop for high-speed railways. The workshop is planned in a straight line shape, including a first area and a second area. The first area serves as a storage area for raw materials and a processing and storage area for semi-finished products. The second area is equipped with a fixed binding jig for steel reinforcement binding and hoisting operations. A bridge crane in the first area can travel to the fixed binding jig for operation, and the beam fabrication platform is arranged in a straight line to realize the assembly line construction operation of the precast beam steel reinforcement process.
[0005] In the steel reinforcement workshop for prestressed box girders of high-speed railways as described above, optionally, two steel reinforcement storage areas are provided in the first area in a symmetrical arrangement. One storage area has, from the inside out, a left-side column, a left-side column, and a left-side column arranged sequentially on its front side. The other storage area has, from the inside out, a right-side column, a right-side column, and a right-side column arranged sequentially on its front side.
[0006] The first column of the left includes a first semi-finished product processing area, a first semi-finished product storage area, and a positioning net material preparation area, which are distributed in sequence. The second column of the left includes a second semi-finished product storage area, a second semi-finished product processing area, and a third semi-finished product storage area, which are distributed in sequence. The third column of the left is provided with a first straightening area.
[0007] The rightmost column includes a third semi-finished product processing area, a fourth semi-finished product storage area, a positioning mesh processing area, and a positioning mesh storage area, which are distributed in sequence. The rightmost second column includes a fifth semi-finished product storage area, a fourth semi-finished product processing area, a hook bar storage area, and a rebar detail drawing area, which are distributed in sequence. The rightmost third column is equipped with a second straightening area.
[0008] In the prestressed box girder steel reinforcement workshop of a high-speed railway as described above, optionally, the first semi-finished product processing area and the third semi-finished product storage area are symmetrically distributed from left to right, and the front and rear spans of the first semi-finished product processing area, the third semi-finished product processing area, and the second semi-finished product storage area are adapted to the overall front and rear spans of the fifth semi-finished product storage area and the fourth semi-finished product processing area.
[0009] In the prestressed box girder steel reinforcement workshop for high-speed railways as described above, optionally, the front and rear spans of the first semi-finished product storage area, the front and rear spans of the fourth semi-finished product storage area and the positioning net processing area, and the front and rear spans of the semi-finished product processing area are adapted to each other.
[0010] In the prestressed box girder steel reinforcement workshop of a high-speed railway as described above, optionally, the front and rear spans of the overall positioning mesh processing area and positioning mesh storage area are adapted to the front and rear spans of the steel reinforcement detail drawing area, and the front and rear spans of the third semi-finished product storage area are adapted to the front and rear spans of the positioning mesh storage area.
[0011] In the prestressed box girder steel reinforcement workshop of a high-speed railway as described above, optionally, the first semi-finished product storage area and the fourth semi-finished product storage area are symmetrically distributed from left to right, and the front and rear spans of the hook bar storage area and the fourth semi-finished product storage area are adapted to each other.
[0012] In the steel reinforcement workshop for prestressed box girders of high-speed railways as described above, the positioning net preparation area and the positioning net processing area are optionally distributed symmetrically from left to right.
[0013] The second aspect of this utility model provides a longitudinal continuous bar processing platform, applied to the steel bar workshop of prestressed box girder of high-speed railway as described in any of the above claims. It includes two longitudinal bars that are symmetrically distributed from left to right, a traveling frame that is sequentially distributed between the two longitudinal bars, a placement frame that is set on the traveling frame and can be opened and closed, and two rows of wedge blocks that are raised and lowered on the traveling frame. The two ends of the longitudinal continuous bar are respectively placed on the two placement frames of the box girder, and the two rows of wedge blocks on the placement frame are staggered in the width direction by a longitudinal continuous bar diameter distance. The two rows of wedge blocks on the traveling frame are displaced upward so that the two sets of longitudinal continuous bars on the placement frame are laid flat and staggered.
[0014] In the longitudinal rib processing platform described above, optionally, the bottom of the placement frame is provided with a liftable slide rail, the wedge block is slidably mounted on the slide rail, the traveling frame is provided with a diagonal brace cylinder, and the extended end of the diagonal brace cylinder is rotatably connected to the bottom of the slide rail. The end of the placement frame away from the extended end of the diagonal brace cylinder is rotatably connected to the traveling frame, and the other end of the placement frame is provided with a support rod supported on the traveling frame. When the diagonal brace cylinder extends, it first pushes the slide rail up, and after the slide rail rises to the highest position, it pushes the placement frame to a vertical state.
[0015] In the longitudinal rib processing platform described above, optionally, the initial state of the placement frame is that one end of the support rod is tilted downwards, and the wedge blocks are gathered on the side of the placement frame with a lower height. The width of the wedge blocks is adapted to the outer diameter of the longitudinal rib, and when the wedge blocks are raised to the highest position, the side height of the wedge blocks is adapted to the end height of the longitudinal rib.
[0016] This utility model discloses a prestressed box girder steel reinforcement workshop for high-speed railways. The overall layout is primarily planned in a linear fashion, emphasizing the rationality of functional areas, the convenience of assembly line operations, the standardization of construction work, and the overall cleanliness of the space. It breaks away from traditional planning concepts, making the layout more rational and reliable.
[0017] This utility model's longitudinal continuous bar processing platform can realize the batch laying, staggered splicing, positioning and transportation of longitudinal continuous bars, improving the processing and transportation efficiency of longitudinal continuous bars and reducing construction costs. Attached Figure Description
[0018] The disclosure of this utility model will become more apparent with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings:
[0019] Figure 1 is a plan view of the steel reinforcement workshop for high-speed railway prestressed box girder according to Embodiment 1 of this utility model;
[0020] Figure 2 is a schematic diagram of the longitudinal through-rib processing platform of Embodiment 2 of this utility model;
[0021] Figure 3 is a front view of the longitudinal through-rib processing platform of Embodiment 2 of this utility model;
[0022] Figure 4 is a partial disassembly diagram of the longitudinal through-rib processing platform of Embodiment 2 of this utility model.
[0023] Attached reference numerals: 1-Reinforcing bar storage area; 2-First semi-finished product processing area; 3-First semi-finished product storage area; 4-Positioning mesh preparation area; 5-Second semi-finished product storage area; 6-Second semi-finished product processing area; 7-Third semi-finished product storage area; 8-First straightening area; 9-Third semi-finished product processing area; 10-Fourth semi-finished product storage area; 11-Positioning mesh processing area; 12-Positioning mesh storage area; 13-Fifth semi-finished product storage area; 14-Fourth semi-finished product storage area. 15-Product processing area; 16-Hook bar storage area; 17-Rebar detail drawing area; 18-Second straightening area; 19-Longitudinal bar; 20-Traveling frame; 20-Placement frame; 20.1-Upper buckle plate; 20.2-Lower buckle plate; 20.3-Plug-in part; 20.4-Plug hole; 20.5-Limit bolt; 21-Wedge block; 22-Slide rail; 23-Diagonal brace cylinder; 24-Support rod; 25-Slide rod; 26-Guide rod; 27-Limit nut. Detailed Implementation
[0024] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0025] As shown in Figure 1, this embodiment provides a prestressed box girder steel reinforcement workshop for high-speed railways. The workshop is planned in a straight line shape, including a first area and a second area. The first area serves as a storage area for raw materials and a processing and storage area for semi-finished products. The second area is equipped with a fixed binding jig for steel reinforcement binding and hoisting operations. In the first area, a bridge crane can travel to the fixed binding jig for operation, and the beam fabrication platform is arranged in a straight line to realize the assembly line construction operation of the precast beam steel reinforcement process.
[0026] Within the first area, two symmetrically distributed rebar storage areas 1 are set up. In one rebar storage area 1, the front side is arranged with a left-hand column, a left-hand second column, and a left-hand third column from the inside out. In the other rebar storage area 1, the front side is arranged with a right-hand column, a right-hand second column, and a right-hand third column from the inside out.
[0027] The first column of the left includes the first semi-finished product processing area 2, the first semi-finished product storage area 3, and the positioning net material preparation area 4, which are distributed in sequence. The second column of the left includes the second semi-finished product storage area 5, the second semi-finished product processing area 6, and the third semi-finished product storage area 7, which are distributed in sequence. The third column of the left is equipped with the first straightening area 8.
[0028] The rightmost column includes the third semi-finished product processing area 9, the fourth semi-finished product storage area 10, the positioning net processing area 11, and the positioning net storage area 12, which are distributed in sequence. The second column from the right includes the fifth semi-finished product storage area 13, the fourth semi-finished product processing area 14, the hook bar storage area 15, and the rebar detail drawing area 16, which are distributed in sequence. The third column from the right is provided with a second straightening area 17.
[0029] The first semi-finished product processing area 2 and the third semi-finished product storage area 7 are symmetrically distributed from left to right, and the front and rear spans of the first semi-finished product processing area 2, the third semi-finished product processing area, and the second semi-finished product storage area 5 are adapted to the overall front and rear spans of the fifth semi-finished product storage area 13 and the fourth semi-finished product processing area 14.
[0030] The front and rear spans of the first semi-finished product storage area 3, the fourth semi-finished product storage area 10, and the positioning net processing area 11 are compatible with the front and rear spans of the semi-finished product processing area.
[0031] The front and rear spans of the positioning mesh processing area 11 and the positioning mesh storage area 12 are adapted to the front and rear spans of the rebar detail drawing area 16, and the front and rear spans of the third semi-finished product storage area 7 are adapted to the front and rear spans of the positioning mesh storage area 12.
[0032] The first semi-finished product storage area 3 and the fourth semi-finished product storage area 10 are symmetrically distributed from left to right, and the front and rear spans of the hook reinforcement storage area 15 and the fourth semi-finished product storage area 10 are matched. The positioning net preparation area 4 and the positioning net processing area 11 are symmetrically distributed from left to right.
[0033] In Example 1, the "I"-shaped rebar workshop significantly reduces the area covered by the prefabricated steel sheet building, the span of the steel structure, the net height of the building, the floor area, and the capital investment compared to the "L"-shaped rebar workshop. The reduced floor area allows for greater utilization of the beam yard area, and the "I"-shaped rebar workshop does not require the installation of mobile binding jigs.
[0034] As shown in Figures 2 to 4, this embodiment 2 provides a longitudinal continuous bar processing platform, which is applied to the prestressed box girder steel bar workshop of the high-speed railway mentioned above. It includes two longitudinal bars 18 that are symmetrically distributed from left to right, a traveling frame 19 that is distributed sequentially between the two longitudinal bars 18, a placement frame 20 that is set on the traveling frame 19 and can be opened and closed, and two rows of wedge blocks 21 that are raised and lowered on the traveling frame 19. The two ends of the longitudinal continuous bar are respectively placed on the two placement frames 20 of the box girder, and the two rows of wedge blocks 21 on the placement frame 20 are staggered in the width direction by a longitudinal continuous bar diameter distance. The two rows of wedge blocks 21 on the traveling frame 19 are displaced upward so that the two sets of longitudinal continuous bars on the placement frame 20 are laid flat and staggered.
[0035] The walking frame 19 is set in a "C" - shaped structure with the opening facing upwards. Rollers are provided on both sides of the walking frame 19. The placing frame 20 is sleeved on the longitudinal rods 18, so that the cooperation of the two longitudinal rods 18 can straighten the walking frame 19 and ensure that the walking frame 19 can walk stably on the ground.
[0036] When the placing frame 20 is in the closed state, it forms a long strip - shaped "mouth" - shaped structure. When the longitudinal through - reinforcement is placed in the placing frame 20, the placing frame 20 can limit it in the up, down, left, and right four directions to prevent the longitudinal through - reinforcement from displacing.
[0037] Specifically, the placing frame 20 includes an upper buckle plate 20.1 and a lower buckle plate 20.2 which are distributed up and down. Both ends between the upper buckle plate 20.1 and the lower buckle plate 20.2 are in an inserted - connection state, and a limit bolt 20.5 is set to prevent the upper buckle plate 20.1 from detaching from the top of the lower buckle plate 20.2.
[0038] In this embodiment, insertion parts 20.3 are provided at the top ends of both sides of the lower buckle plate 20.2, and jack holes 20.4 are provided at both ends of the upper buckle plate 20.1. During the connection process of the upper buckle plate 20.1 and the lower buckle plate 20.2, after the top end of the insertion part 20.3 penetrates through the jack hole 20.4, the limit bolt 20.5 is installed on the insertion part 20.3, so that the limit bolt 20.5 blocks on the top surface of the upper buckle plate 20.1.
[0039] The top end of the wedge - shaped block 21 is a tip. The wedge - shaped block 21 is slidably installed on the placing frame 20 in the width direction. During the process of the wedge - shaped block 21 being inserted upwards between two adjacent longitudinal through - reinforcements, it will move horizontally synchronously with the longitudinal through - reinforcements.
[0040] Specifically, a liftable slide rail 22 is provided at the bottom of the placing frame 20. The wedge - shaped block 21 is slidably installed on the slide rail 22. An inclined strut oil cylinder 23 is provided on the walking frame 19, and the extending end of the inclined strut oil cylinder 23 is rotatably connected to the bottom of the slide rail 22. One end of the placing frame 20 far from the extending end of the inclined strut oil cylinder 23 is rotatably connected to the walking frame 19, and a strut 24 that supports on the walking frame 19 is provided at the other end of the placing frame 20. When the inclined strut oil cylinder 23 extends, it first pushes the slide rail 22 to rise, and after the slide rail 22 rises to the highest position, the placing frame 20 is pushed upwards to the vertical state.
[0041] The wedge - shaped block 21 is installed on the lower buckle plate 20.2 in a liftable manner through the lifting of the slide rail 22, and the wedge - shaped block 21 is displaced in the width direction on the placing frame 20 by sliding on the slide rail 22. Specifically, slide rods 25 are provided at the bottom of the front and rear sides of the wedge - shaped block 21, and the slide rods 25 are slidably installed in the track grooves of the slide rail 22. Guide rods 26 are fixedly provided at both ends of the lower buckle plate 20.2, and both ends of the slide rail 22 are slidably sleeved on the guide rods 26.
[0042] Specifically, the bottom end of the inclined support cylinder 23 is rotatably connected to the traveling frame 19, and the top end of the support rod 24 is fixedly connected to the lower buckle plate 20.2. The support rod 24 supports one end of the placement frame 20 on the traveling frame 19, so that in the initial state, the slide rail 22 is at the lowest position, and at this time, the wedge blocks 21 are all located below the placement frame 20.
[0043] When the diagonal bracing cylinder 23 extends, it first lifts the slide rail 22. As the slide rail 22 moves upward, the wedge block 21 arranges the longitudinal ribs sequentially. At this time, the two sets of longitudinal ribs on the placement frame 20 are staggered in the width direction. Then, the traveling frame 19 is directly pushed, causing the relative sections of the two adjacent sets of longitudinal ribs to interlock and fit together. Afterward, the diagonal bracing cylinder 23 continues to extend, causing the placement frame 20 to switch to a vertical state while bearing the longitudinal ribs. In this state, the worker directly welds and fixes the overlap of the two sets of longitudinal ribs from both sides, thus realizing the processing of the longitudinal ribs.
[0044] After the longitudinal reinforcement bars are processed, the processed longitudinal reinforcement bars are transferred to the fixed binding jig position for reinforcement binding operations by the displacement of the traveling frame 19.
[0045] The initial state of the placement rack 20 is that one end of the support rod 24 is tilted downwards, and the wedge blocks 21 are gathered on the side of the placement rack 20 with a lower height. The width of the wedge blocks 21 is adapted to the outer diameter of the longitudinal rib. When the wedge blocks 21 rise to the highest position, the side height of the wedge blocks 21 is adapted to the end height of the longitudinal rib.
[0046] In the initial state, due to the combined effect of gravity, both rows of wedge blocks 21 on the placement rack 20 converge on the side with the lower height of the placement rack 20. Simultaneously, after the longitudinal ribs are placed on the placement rack 20, they also converge on the side with the lower height of the placement rack 20. In this state, the lowest wedge block 21 is aligned directly with the position corresponding to the first longitudinal rib.
[0047] Specifically, limit nuts 27 are provided on both the front and rear sides of the placement frame 20 on the longitudinal rod 18. The limit nuts 27 are used to limit the displacement of the placement frame 20 relative to the longitudinal rod 18. After the two adjacent sets of longitudinal ribs are staggered and interlocked after being laid out, the placement frame 20 contacts one of the limit nuts 27. Before transferring the processed longitudinal ribs, the placement frame 20 can be fixed to the longitudinal rod 18 by rotating the limit nuts 27, so as to realize the overall movement of the processing platform.
[0048] The technical scope of this utility model is not limited to the contents of the above description. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the scope of this utility model.
Claims
1. A steel reinforcement workshop for prestressed box girders in high-speed railways, characterized in that, The prestressed box girder steel reinforcement workshop for high-speed railway is planned in a straight line shape, including a first area and a second area. The first area serves as a storage area for raw materials and a processing and storage area for semi-finished products. The second area is equipped with fixed binding jigs for steel reinforcement binding and hoisting operations. In the first area, a bridge crane can travel to the fixed binding jigs to perform operations, and the beam fabrication platform is arranged in a straight line to realize the assembly line construction operation of the precast beam steel reinforcement process.
2. The steel reinforcement workshop for high-speed railway prestressed box girder as described in claim 1, characterized in that, The first area contains two symmetrically distributed steel bar storage areas (1). One storage area (1) has a left-side first column, a left-side second column, and a left-side third column arranged sequentially from the inside out. The other storage area (1) has a right-side first column, a right-side second column, and a right-side third column arranged sequentially from the inside out. The left-side first column includes a first semi-finished product processing area (2), a first semi-finished product storage area (3), and a positioning mesh preparation area (4) arranged sequentially. The left-side second column includes a second semi-finished product storage area (5) arranged sequentially. The left three columns are provided with a first straightening area (8); the right column includes a third semi-finished product processing area (9), a fourth semi-finished product storage area (10), a positioning net processing area (11) and a positioning net storage area (12) distributed in sequence; the right two columns include a fifth semi-finished product storage area (13), a fourth semi-finished product processing area (14), a hook bar storage area (15) and a rebar detail drawing area (16) distributed in sequence; the right three columns are provided with a second straightening area (17).
3. A steel reinforcement workshop for prestressed box girders of high-speed railways as described in claim 2, characterized in that, The first semi-finished product processing area (2) and the third semi-finished product storage area (7) are symmetrically distributed from left to right, and the front and back spans of the first semi-finished product processing area (2), the third semi-finished product processing area, and the second semi-finished product storage area (5) are adapted to the overall front and back spans of the fifth semi-finished product storage area (13) and the fourth semi-finished product processing area (14).
4. A steel reinforcement workshop for prestressed box girders of high-speed railways as described in claim 2, characterized in that, The front-to-back span of the first semi-finished product storage area (3), the front-to-back span of the fourth semi-finished product storage area (10) and the positioning net processing area (11) are adapted to the front-to-back span of the semi-finished product processing area.
5. A steel reinforcement workshop for prestressed box girders of high-speed railways as described in claim 2, characterized in that, The front-to-back span of the positioning mesh processing area (11) and the positioning mesh storage area (12) are adapted to the front-to-back span of the steel bar detail drawing area (16), and the front-to-back span of the third semi-finished product storage area (7) is adapted to the front-to-back span of the positioning mesh storage area (12).
6. A steel reinforcement workshop for prestressed box girders of high-speed railways as described in claim 2, characterized in that, The first semi-finished product storage area (3) and the fourth semi-finished product storage area (10) are symmetrically distributed from left to right, and the front and rear spans of the hook bar storage area (15) and the fourth semi-finished product storage area (10) are adapted to each other.
7. A steel reinforcement workshop for prestressed box girders of high-speed railways as described in claim 2, characterized in that, The positioning net preparation area (4) and the positioning net processing area (11) are symmetrically distributed from left to right.
8. A longitudinal continuous reinforcement processing platform, applied in the high-speed railway prestressed box girder reinforcement workshop according to any one of claims 1 to 7, characterized in that, It includes two longitudinal bars (18) that are symmetrically distributed on the left and right, a walking frame (19) that is distributed between the two longitudinal bars (18), a placement frame (20) that is set on the walking frame (19) and can be opened and closed, and a wedge block (21) that is raised and lowered on the walking frame (19). The wedge block (21) is inserted between two steel bars of the box girder by upward displacement, so that the steel bars are laid flat on the placement frame (20) at equal intervals.
9. A longitudinal continuous rib processing platform as described in claim 8, characterized in that, The bottom of the placement frame (20) is provided with a slide rail (22) that can be raised and lowered. The wedge block (21) is slidably installed on the slide rail (22). The walking frame (19) is provided with a diagonal support cylinder (23), and the extended end of the diagonal support cylinder (23) is rotatably connected to the bottom of the slide rail (22). One end of the placement frame (20) away from the extended end of the diagonal support cylinder (23) is rotatably connected to the walking frame (19). The other end of the placement frame (20) is provided with a support rod (24) supported on the walking frame (19). When the diagonal support cylinder (23) extends, it first pushes the slide rail (22) to rise. After the slide rail (22) rises to the highest position, it pushes the placement frame (20) to a vertical position.
10. A longitudinal continuous rib processing platform as described in claim 9, characterized in that, The initial state of the placement frame (20) is that one end of the support rod (24) is tilted downwards, and the wedge blocks (21) are gathered on the side of the placement frame (20) with a lower height. The width of the wedge blocks (21) is adapted to the outer diameter of the longitudinal rib. When the wedge blocks (21) are raised to the highest position, the side height of the wedge blocks (21) is adapted to the end height of the longitudinal rib.