Pre-tensioning plate tensioning pedestal structure for road

Abstract

The pre-tensioning plate tensioning pedestal structure for the road comprises two tensioning pedestal pairs which are oppositely arranged, an operation table top is arranged between the two tensioning pedestal pairs, and each tensioning pedestal pair is composed of two tensioning pedestals. The structure is characterized in that the tensioning pedestal is composed of a compression-resistant pile, an uplift pile, a cover beam, a bracket and a tensioning cross beam, the compression-resistant pile is close to one side of the operation table top, and the cover beam is poured at the upper ends of the compression-resistant pile and the uplift pile; the bracket is poured on the cover beam, the side, back on to the operation table top, of the bracket is a bracket vertical face, and the tensioning cross beam is placed on the cover beam and abuts against the bracket vertical face. And a round hole is formed in the tensioning cross beam. According to the road pre-tensioning plate tensioning pedestal structure, the stable tensioning pedestal structure is formed, it is ensured that the tensioning effect of the steel strand in the prefabricated plate meets the requirement, and compared with a traditional gravity type pedestal, the concrete using amount is small, the economic cost is saved, and the steel strand tensioning effect meeting the requirement can be obtained.

Description

Technical Field

[0001] The utility model relates to a pre-tensioned plate tensioning pedestal structure for roads, and more specifically, particularly relates to a pre-tensioned plate tensioning pedestal structure for roads. Background Art

[0002] The road surface composed of prefabricated reinforced concrete prestressed slabs has better bearing capacity than asphalt concrete pavement, making it more and more used in heavy-load traffic sections. The prestressed slabs for roads are composed of transverse reinforcements, longitudinally distributed steel strands and reinforced concrete. The road surface is formed by factory prefabrication and on-site assembly. In the process of prefabrication of prestressed slabs for roads, transverse reinforcements and steel strands are first laid out. After the laying is completed, the steel strands are tensioned with tensioning equipment, and then concrete is poured. After the concrete solidifies, the tensioning of the steel strands is cancelled. The released steel strands will apply longitudinal compressive stress to the prestressed slabs for roads through the end plates to increase the bearing capacity of the prestressed slabs for roads.

[0003] Therefore, in the process of prefabrication of road prestressed slabs, the prefabrication process of road prestressed slabs is directly related to the quality of prefabricated prestressed concrete pavement. Road prestressed slabs are relatively wide, generally 3.5m~4m (the width of hollow slabs is usually 1m~1.25m), and the corresponding tensioning pedestals are also made wider. The use of traditional gravity pedestals consumes a large amount of concrete, which is extremely uneconomical. At present, there is no more economical and reasonable solution for the tensioning pedestals of road prestressed slabs. Summary of the invention

[0004] In order to overcome the disadvantages of the above technical problems, the utility model provides a pre-tensioned plate tensioning pedestal structure for road use.

[0005] The utility model discloses a tensioning pedestal structure for a road pre-stressed plate, comprising two tensioning pedestal pairs arranged opposite to each other, an operating table surface for prefabricating the road pre-stressed plate between the two tensioning pedestal pairs, and the tensioning pedestal pairs are composed of two tensioning pedestals arranged at intervals; the characteristics are as follows: the tensioning pedestal is composed of compression piles, pull-out piles, cap beams, corbels and tensioning cross beams, the compression piles and pull-out piles are vertically inserted into the foundation, the compression piles are close to one side of the operating table surface, the cap beams are cast on the upper ends of the compression piles and pull-out piles; the corbels are cast on the cap beams, the side of the corbels facing away from the operating table surface is the corbel facade, the tensioning cross beams are placed on the cap beams and in conflict with the corbel facades; the tensioning cross beams are provided with circular holes for tensioning screws for tensioning the steel strands in the road pre-stressed plate to pass through.

[0006] The utility model discloses a pre-tensioned slab tensioning pedestal structure for roads, wherein the upper ends of the compression piles and the pull-out piles are poured with pile top core-filling concrete, and longitudinal steel bars and annular stirrups are arranged in the pile top core-filling concrete.

[0007] The utility model discloses a tensioning pedestal structure for a road pre-tensioned plate, wherein the tensioning crossbeam is composed of a front steel plate, a rear steel plate, an upper steel plate, a lower steel plate, an upper I-beam and a lower I-beam, wherein the upper I-beam and the lower I-beam are distributed up and down, and the front steel plate, the rear steel plate, the upper steel plate and the lower steel plate are welded to the periphery of the upper I-beam and the lower I-beam; and circular holes are evenly opened on the front steel plate and the rear steel plate between the upper I-beam and the lower I-beam.

[0008] The utility model discloses a pre-tensioned pedestal structure for road use, wherein the compression piles are steel pipe piles, the pile diameter of the compression piles is 60cm~80cm, the wall thickness is 9mm~12mm, the pile length is 10m~15m, the length of the core-filled concrete poured on the upper end of the compression piles is not less than twice the pile diameter, and the length of the longitudinal steel bars at the upper end of the compression piles extending into the cap beam is not less than 1 times the pile diameter.

[0009] The utility model discloses a pre-tensioned pedestal structure for road use, wherein the pull-out piles are steel pipe piles, the pull-out piles have a pile diameter of 60cm-80cm, a wall thickness of 12mm-14mm, and a pile length of 10m-15m, the length of the pile top core-filled concrete poured at the upper end of the pull-out piles is not less than 3m, and the length of the longitudinal steel bars at the upper end of the pull-out piles extending into the cap beam is not less than 35 times the diameter of the longitudinal steel bars.

[0010] The utility model provides a pre-tensioned slab tensioning pedestal structure for roads, wherein the diameter of the compression pile is equal to the diameter of the pull-out pile, and the horizontal distance from the center of the compression pile to the center of the pull-out pile is not less than 3 times the diameter of the compression pile or the diameter of the pull-out pile.

[0011] The utility model provides a pre-tensioned slab tensioning pedestal structure for roads, wherein the cap beam has a height of 70 cm to 100 cm, a width of 160 cm to 180 cm, a length of 4 m to 5.0 m, and a concrete grade of 35 MPa to 40 MPa used in the cap beam.

[0012] The utility model provides a pre-tensioned slab tensioning pedestal structure for roads, wherein the height of the corbel is 60 cm to 80 cm, the width is 90 cm to 90 cm, the length is 1.2 m to 1.5 m, and the concrete grade used for the corbel is 35 MPa to 40 MPa.

[0013] The utility model provides a pre-tensioned plate tensioning pedestal structure for roads, wherein the thickness of the front steel plate, the rear steel plate, the upper steel plate and the lower steel plate are not less than 1.5 cm, the distance between the lower edge of the upper I-beam and the upper edge of the lower I-beam is 2 cm to 2.5 cm, and the diameter of the circular hole is 1.8 cm to 2.2 cm.

[0014] The beneficial effects of the utility model are as follows: the tensioning pedestal structure of the road pre-tensioned plate of the utility model is composed of two pairs of tensioning pedestals arranged opposite to each other, the tensioning pedestals are composed of compression piles, pull-out piles, cap beams, corbels and tensioning cross beams, the compression piles and pull-out piles support the cap beams, the two corbels are cast on the cap beams, and in the process of prefabricating the road pre-tensioned plate on the operating table between the two tensioning pedestals, the tensioning screw rods passing through the tensioning cross beams tension the steel strands in the road pre-tensioned plate, and the cross beams transmit the force of the tensioning steel strands to the To the two corbels, and then transmitted to the cap beam through the corbels, the cap beam applies pressure to the compression piles at the front end and applies tension (upward) force to the pull-out piles at the rear end. In this way, the compression piles and pull-out piles are responsible for bearing the force during the tensioning process of the steel strands in the road pre-tensioned slab, forming a structurally stable tensioning pedestal structure, ensuring that the tensioning effect of the steel strands in the precast slab meets the requirements. Compared with the traditional gravity pedestal, the amount of concrete used is small, which saves economic costs, and can obtain a steel strand tensioning effect that meets the requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a front view of the pre-tensioned plate tensioning pedestal structure for roads of the utility model;

[0016] Figure 2 It is a top view of the pre-tensioned plate tensioning pedestal structure for roads of the utility model;

[0017] Figure 3 It is a schematic cross-sectional view of the tension beam in the utility model;

[0018] Figure 4 The utility model is a schematic diagram of the use principle of the road pre-stressed plate tensioning pedestal structure.

[0019] In the figure: 1 compression pile, 2 tension pile, 3 cap beam, 4 corbel, 5 tensioning beam, 6 operating table, 7 tensioning pedestal pair, 8 core-filled concrete on pile top, 9 longitudinal steel bars, 10 annular stirrups, 11 front steel plate, 12 rear steel plate, 13 upper steel plate, 14 lower steel plate, 15 upper I-beam, 16 lower I-beam, 17 circular hole, 18 pre-tensioning plate for road, 19 external formwork frame, 20 steel strand, 21 tensioning cylinder, 22 auxiliary beam, 23 corbel facade, 24 tensioning screw, 25 tensioning pedestal. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0021] like Figure 1 and Figure 2As shown, the front view and the top view of the prestressing pedestal structure of the road prestressing plate of the utility model are respectively given. The prestressing pedestal structure of the road prestressing plate of the utility model is composed of two tensioning pedestal pairs 7 arranged opposite to each other, and an operating table 6 is formed between the two tensioning pedestal pairs 7 arranged opposite to each other, and the operating table 6 forms the area of ​​the prefabricated road tensioning plate 18. The tensioning pedestal pair 7 is composed of two tensioning pedestals 25 arranged at intervals, and the tensioning pedestal 25 is composed of a compression pile 1, an anti-pulling pile 2, a cap beam 3, a corbel 4 and a tensioning crossbeam 5. The compression pile 1 and the anti-pulling pile 2 are both steel pipe piles, and the compression pile 1 and the anti-pulling pile 2 are driven into the foundation below the cap beam 3. The compression pile 1 is located on the side close to the operating table 6, and the cap beam 3 is cast on the upper ends of the compression pile 1 and the anti-pulling pile 2. There are two corbels 4, and the two corbels 4 are cast on the cap beam 3.

[0022] The side of the corbel 4 facing the operating table 6 is an inclined surface, and the side of the corbel 4 facing away from the operating table 6 is a corbel facade 23. The tensioning beam 5 is placed on the upper surface of the cap beam 3, and the front side of the tensioning beam 5 touches the corbel facade 23. In this way, the two corbels 4 achieve blocking and limiting of the tensioning beam 5. When the steel strands in the pre-tensioned road plate 18 are tensioned by the tensioning beam 5, the force generated by the tensioning of the steel strands is applied to the two corbels 4 through the tensioning beam 5. The center of the tensioning beam 5 is evenly provided with circular holes 17 along its length direction. During the tensioning of the steel strands 20, the tensioning screw 24 passes through the circular hole 17.

[0023] like Figure 4 As shown, a schematic diagram of the use of the pre-tensioning pedestal structure of the road pre-tensioning plate of the utility model is given. An outer mold frame 19 is provided on the operating table 6 between the two tensioning pedestal pairs 7, and the road pre-tensioning plate 18 is cast in the outer mold frame 19. Both tensioning pedestal pairs 7 are provided with tensioning screws 24 passing through the circular holes 17 on the tensioning crossbeams 5, and the tensioning screws 24 are connected to the steel strands 20 in the road pre-tensioning plate 18. The tensioning pedestal pair 7 below is not only provided with the tensioning crossbeam 5, but also provided with an auxiliary crossbeam 22 on the outside of the tensioning crossbeam 5, and a tensioning oil cylinder 21 is provided between the auxiliary crossbeam 22 and the tensioning crossbeam 5, and the tensioning of the steel strands 20 is achieved by using the tensioning oil cylinder 21 to push the auxiliary crossbeam 22 from the outside.

[0024] It can be seen that in the process of tensioning the 7 pairs of steel strands 20 using the tensioning pedestal, the tension of the steel strands 20 will be applied to the tensioning beam 5, and then transferred to the corbel 4 through the tensioning beam 5, and then transferred to the cap beam 3 through the corbel 4, and finally transferred to the compression pile 1 and the pull-out pile 2, forming a pressure on the compression pile 1 and a pulling (upward) force on the pull-out pile 2. The stable structure of the compression pile 1, the pull-out pile 2, the cap beam 3 and the corbel 4 ensures the tensioning effect during the prefabrication of the pre-tensioned road slab 18. Compared with the existing traditional gravity pedestal, the amount of concrete used is small, saving economic costs.

[0025] In order to achieve a stable connection between the compression pile 1 and the pull-out pile 2 and the cap beam 3, the upper ends of the compression pile 1 and the pull-out pile 2 are poured with pile top core concrete 8, and the lower ends of the pile top core concrete 8 are horizontal partitions welded inside the steel pipe pile to support the pouring process of the pile top core concrete 8. The pile top core concrete 8 is provided with longitudinal steel bars 9 and annular stirrups 10, the longitudinal steel bars 9 are evenly arranged in the circular direction, and the annular stirrups 10 are tied together with the longitudinal steel bars 9 and poured in the pile top core concrete 8.

[0026] As specific requirements, the diameter of the compression pile 1 is 60cm~80cm, the wall thickness is 9mm~12mm, and the pile length is 10m~15m. The length of the pile top core concrete 8 poured at the upper end of the compression pile 1 is not less than 2 times the pile diameter, and the length of the longitudinal steel bar 9 at the upper end of the compression pile 1 extending into the cap beam 3 is not less than 1 times the pile diameter. The diameter of the pull-out pile 2 is 60cm~80cm, the wall thickness is 12mm~14mm, and the pile length is 10m~15m. The length of the pile top core concrete 8 poured at the upper end of the pull-out pile 2 is not less than 3m, and the length of the longitudinal steel bar 9 at the upper end of the pull-out pile 2 extending into the cap beam 3 is not less than 35 times the diameter of the longitudinal steel bar 9. The horizontal distance from the center of the compression pile 1 to the center of the pull-out pile 2 is not less than 3 times the diameter of the compression pile or the diameter of the pull-out pile.

[0027] like Figure 3 As shown, a schematic cross-sectional view of the tension beam in the utility model is given, and the tension beam 5 shown is composed of a front steel plate 11, a rear steel plate 12, an upper steel plate 13, a lower steel plate 14, an upper I-beam 15 and a lower I-beam 16. The upper I-beam 15 and the lower I-beam 16 are distributed up and down, and the front steel plate 11, the rear steel plate 12, the upper steel plate 13 and the lower steel plate 14 are welded to the periphery of the upper I-beam 15 and the lower I-beam 16; circular holes 17 are evenly opened on the front steel plate 11 and the rear steel plate 12 between the upper I-beam 15 and the lower I-beam 16. The thickness of the front steel plate 11, the rear steel plate 12, the upper steel plate 13 and the lower steel plate 14 is not less than 1.5 cm, the distance between the lower edge of the upper I-beam 15 and the upper edge of the lower I-beam 16 is 2 cm to 2.5 cm, and the diameter of the circular hole 17 is 1.8 cm to 2.2 cm.

[0028] Among them, the height of the cap beam 3 is 70cm~100cm, the width is 160cm~180cm, the length is 4m~5.0m, and the concrete grade used in the cap beam 3 is 35MPa~40MPa. The height of the corbel 4 is 60cm~80cm, the width is 90cm~90cm, the length is 1.2m~1.5m, and the concrete grade used in the corbel 4 is 35MPa~40MPa.

Claims

1. A pre-tensioned slab structure for a road, comprising two pairs of tensioned slabs (7) arranged opposite to each other, an operating table (6) for prefabricating a pre-tensioned slab (18) for a road between the two pairs of tensioned slabs, the tensioned slab pair consisting of two tensioned slabs arranged at intervals; characterized in that: The tensioning pedestal is composed of compression piles (1), pull-out piles (2), cap beams (3), corbels (4) and tensioning cross beams (5). The compression piles and pull-out piles are vertically inserted into the foundation, the compression piles are close to the side of the operating table, and the cap beams are cast on the upper ends of the compression piles and pull-out piles; the corbels are cast on the cap beam, and the side of the corbels facing away from the operating table is the corbel facade (23), and the tensioning cross beam is placed on the cap beam and contacts the corbel facade; the tensioning cross beam is provided with a circular hole (17) through which a tensioning screw (24) for tensioning the steel strands (20) in the road pre-tensioning plate passes.

2. The pre-tensioned plate tensioning pedestal structure for road use according to claim 1 is characterized in that: The upper ends of the compression pile (1) and the pull-out pile (2) are both poured with pile top core-filling concrete (8), and longitudinal steel bars (9) and annular stirrups (10) are arranged in the pile top core-filling concrete.

3. The pre-tensioned plate tensioning pedestal structure for road use according to claim 1 or 2, characterized in that: The tensioning crossbeam (5) is composed of a front steel plate (11), a rear steel plate (12), an upper steel plate (13), a lower steel plate (14), an upper I-beam (15) and a lower I-beam (16); the upper I-beam and the lower I-beam are arranged vertically; the front steel plate, the rear steel plate, the upper steel plate and the lower steel plate are welded to the periphery of the upper I-beam and the lower I-beam; and circular holes (17) are evenly provided on the front steel plate and the rear steel plate between the upper I-beam and the lower I-beam.

4. The pre-tensioned plate tensioning pedestal structure for road use according to claim 2 is characterized in that: The compression pile (1) is a steel pipe pile, the pile diameter of the compression pile is 60 cm to 80 cm, the wall thickness is 9 mm to 12 mm, and the pile length is 10 m to 15 m. The length of the pile top core filling concrete (8) poured at the upper end of the compression pile is not less than twice the pile diameter, and the length of the longitudinal steel bar (9) at the upper end of the compression pile extending into the cap beam (3) is not less than 1 times the pile diameter.

5. The pre-tensioned slab pedestal structure for road use according to claim 4 is characterized in that: The pull-out pile (2) is a steel pipe pile, the pile diameter of the pull-out pile is 60 cm to 80 cm, the wall thickness is 12 mm to 14 mm, the pile length is 10 m to 15 m, the length of the pile top core-filling concrete (8) poured at the upper end of the pull-out pile is not less than 3 m, and the length of the longitudinal steel bar (9) at the upper end of the pull-out pile extending into the cap beam (3) is not less than 35 times the diameter of the longitudinal steel bar (9).

6. The pre-tensioned plate tensioning pedestal structure for road use according to claim 1 or 2, characterized in that: The pile diameter of the compression pile (1) is equal to the pile diameter of the pull-out pile (2), and the horizontal distance from the center of the compression pile to the center of the pull-out pile is not less than 3 times the pile diameter of the compression pile or the pile diameter of the pull-out pile.

7. The pre-tensioned plate tensioning pedestal structure for road use according to claim 1 or 2, characterized in that: The cap beam (3) has a height of 70 cm to 100 cm, a width of 160 cm to 180 cm, a length of 4 m to 5.0 m, and the concrete grade used in the cap beam is 35 MPa to 40 MPa.

8. The pre-tensioned plate tensioning pedestal structure for road use according to claim 1 or 2, characterized in that: The height of the corbel (4) is 60 cm to 80 cm, the width is 90 cm to 90 cm, the length is 1.2 m to 1.5 m, and the concrete grade used in the corbel is 35 MPa to 40 MPa.

9. The pre-tensioned plate tensioning pedestal structure for road use according to claim 3, characterized in that: The thickness of the front steel plate (11), the rear steel plate (12), the upper steel plate (13) and the lower steel plate (14) is not less than 1.5 cm, the distance between the lower edge of the upper I-beam (15) and the upper edge of the lower I-beam (16) is 2 cm to 2.5 cm, and the diameter of the circular hole (17) is 1.8 cm to 2.2 cm.

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