Elastic device for preventing bottom of side span beam end from cracking after T-beam tensioning
By setting chamfers at the bottom of the T-beam side span ends and filling them with elastic devices, the problem of cracking at the bottom of the side span ends after tensioning was solved, efficient construction without the need for repairs was achieved, and the overall strength and appearance quality of the prefabricated beams were ensured.
Patent Information
- Application Number
- CN202422743449.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-11-12
AI Technical Summary
After prefabricated T-beams are tensioned, the bottom of the side span beam ends are prone to cracking, causing concrete damage. Traditional repair methods are time-consuming and labor-intensive, and it is difficult to ensure quality.
A chamfer is set at the bottom of the T-beam side span end and an elastic device is filled in, including an outer plate, an L-shaped side plate, an elastic telescopic rod and a telescopic cylinder. The elastic pads and pull plates are used to reversely support the anti-arch force and gravity to reduce stress concentration.
It effectively prevents cracking at the bottom of the span beam end after tensioning, reduces concrete damage, eliminates the need for subsequent repair work, ensures appearance integrity, and saves manpower and material resources.
Smart Images
Figure CN223304873U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of prefabricated bridge construction, and more particularly to an elastic device for preventing the bottom of a side span beam end from cracking after a T-beam is tensioned. Background Art
[0002] With the rapid development of my country's transportation industry, the demand for prefabricated bridge beams and slabs continues to expand, while the requirements for product quality are also constantly improving. Currently, beam and slab prefabrication often requires the construction of a new prefabrication yard near the project site, equipped with infrastructure such as beam fabrication and storage platforms, gantry cranes, and a rebar yard. This relies primarily on manual processing and production.
[0003] Currently, precast beams and slabs are generally prestressed using intelligent tensioning equipment to control tensioning stress and elongation. During the construction of precast T-beams, inevitable cracks often appear at the ends of the span beams after prestressing, and even chipping and falling corners can lead to quality problems such as missing reinforcement. This is because after the precast T-beams are tensioned, the beams arch due to the prestressing. The bottom of the beams bears the horizontal friction generated by the arching and the entire deadweight of the beams, causing compressive stress to damage the concrete at the bottom of the beams. Traditionally, cracks or chipping have been manually repaired after they occur. This subsequent repair work is not only time-consuming, labor-intensive, and material-intensive, but simple repairs may also fail to meet quality requirements such as the overall strength of the precast beams. Utility Model Content
[0004] The purpose of the utility model is to provide an elastic device that prevents the bottom of the side span beam end from cracking after the T-beam is tensioned. On the one hand, the device is combined with the bottom area of the side span beam end of the T-beam with a chamfered corner to reduce the stress concentration problem. On the other hand, during the tensioning process, the device can reversely support the anti-arch force and gravity of the beam body to reduce damage to the concrete at the bottom of the beam end.
[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:
[0006] An elastic device for preventing the bottom of the side span end of a T-beam from cracking after tensioning, comprising a T-beam, wherein the T-beam is arranged above a base plate for tensioning, and the base plate is arranged on a steel pedestal, and a plurality of through grooves are processed at intervals on the side surface of the steel pedestal, and an I-beam passes through the inside of each through groove, and a tensioning anchor cable passes through the inside of the T-beam, and a tensioning jack is installed on the outside of the anchor cable through a disc seat, and the front and rear ends of the bottom of the side span end of the T-beam are both provided with 5cm*8cm chamfers, and the chamfers are filled with an elastic device, and the elastic device comprises an outer plate and an L-shaped side plate with symmetrical left and right structures, and connecting plates are extended outward from the lower ends of both sides of the outer plate, and the connecting plates and the steel pedestal are connected through bolts, and a plurality of elastic telescopic rods are laterally spaced inward from the upper end of the inner side surface of the outer plate, and the inner ends of the plurality of elastic telescopic rods are connected to the outer side surface of the elastic pad.
[0007] As a further optimization of this solution, the inner side surface of the elastic pad is an inclined surface and fills the chamfered area of the T-beam, and the outer side surface of the elastic pad is a rectangular surface and extends to the outside of the bottom of the T-beam.
[0008] As a further optimization of this solution, elastic pull plates extend outward on both sides of the inclined surface of the inner side of the elastic pad, a connecting rod is installed at the four corner positions of the surface of the elastic pull plate, and all the connecting rods are fixed obliquely upward to the lower surface of the mounting plate, and a steel wire rope is fixed at the center position of the upper surface of the mounting plate, and the upper end of the steel wire rope passes through the reversing roller to turn outward and is connected to the piston rod of the telescopic cylinder.
[0009] As a further optimization of this solution, the non-rotating portion at the lower end of the reversing roller is connected to a telescopic connecting rod, the lower end of the telescopic connecting rod is fixed to the rotating portion of the rotating seat, and the non-rotating portion of the rotating seat is fixed to the upper surface of the base plate by bolts.
[0010] As a further optimization of this solution, the telescopic cylinder is embedded and fixed on the vertical section of the L-shaped side panel, and an air storage tank is installed on the transverse section of the L-shaped side panel. The upper end of the air storage tank is connected to the air inlet and outlet of the telescopic cylinder through the air inlet and outlet pipes. Vertical connecting plates are provided at one end on the left side and the other end on the right side of the transverse section of the L-shaped side panel. The vertical connecting plates are connected to the I-beams on the corresponding sides by bolts.
[0011] Compared with the existing technology, the beneficial effects of the utility model are as follows:
[0012] The utility model reduces the stress concentration problem by arranging a chamfer structure at the bottom of the side span beam end of the T-beam. At the same time, the elastic pads and the elastic pull plate structures on both sides respectively provide reverse support for the anti-arch force and gravity of the beam body during the tensioning process, thereby reducing damage to the concrete at the bottom of the beam end and cracks or missing edges and corners. After the tensioning is completed, the elastic device can be removed and concrete material can be filled in the chamfer to ensure the appearance integrity of the bottom of the side span beam end of the T-beam, eliminating the need for later manual repair work and saving manpower and material resources. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the structure of the elastic device installed on one side of the T-beam of the utility model;
[0014] Figure 2 This is a schematic diagram of the outer plate connection structure of the utility model;
[0015] Figure 3 This is a schematic diagram of the elastic pull plate connection structure of the utility model;
[0016] Figure 4 This is a schematic diagram of the L-shaped side panel connection structure of the utility model;
[0017] In the figure: 1. T-beam; 2. Anchor cable; 3. Tensioning jack; 4. Bottom plate; 5. I-beam; 6. Outer plate; 7. Elastic pad; 8. Elastic telescopic rod; 9. Bolt; 10. Elastic pull plate; 11. Connecting rod; 12. Mounting plate; 13. Steel wire rope; 14. Reversing roller; 15. Telescopic connecting rod; 16. Rotating seat; 17. Telescopic cylinder; 18. L-shaped side plate; 19. Gas tank; 20. Vertical connecting plate; 21. Steel pedestal. DETAILED DESCRIPTION
[0018] In order to make the technical means, creative features, objectives and effects of the utility model easier to understand, the utility model is further explained below with reference to specific illustrations.
[0019] In order to solve the problem that the existing bottom of the beam end bears the horizontal friction caused by the anti-arch of the beam body on the one hand, and bears the entire dead weight of the beam body on the other hand, resulting in the concrete at the bottom of the beam end being damaged under the action of compressive stress, such as Figure 1 As shown, the present application includes a T-beam, the T-beam 1 is arranged above the bottom plate 4 for tensioning, the bottom plate 4 is arranged on the steel pedestal 21, the side of the steel pedestal 21 is processed with a number of through grooves at intervals and an I-beam 5 is passed through each through groove, the tensioning anchor cable 2 is passed through the inside of the T-beam 1, and the tensioning jack 3 is installed on the outside of the anchor cable 2 through the disc seat, and the front and rear ends of the bottom of the side span of the T-beam 1 are both provided with 5cm*8cm chamfers, and the inside of the chamfers is filled with elastic devices, and the chamfers are provided to reduce stress concentration;
[0020] The elastic device includes an outer plate 6 and an L-shaped side plate 18 with symmetrical left and right structures. Connecting plates extend outward from the lower ends of both sides of the outer plate 6 and are connected to the steel base 21 by bolts 5.
[0021] like Figure 2 As shown, a number of elastic telescopic rods 8 are laterally spaced inward from the upper end of the inner side surface of the outer plate 6, and the inner ends of the several elastic telescopic rods 8 are connected to the outer side surface of the elastic pad 7. The inner side surface of the elastic pad 7 is an inclined surface and fills the chamfered area of the T-beam 1. The outer side surface of the elastic pad 7 is a rectangular surface and extends to the outside of the bottom of the T-beam 1.
[0022] like Figure 3 As shown, elastic pull plates 10 extend outward on both sides of the inclined surface of the inner side surface of the elastic pad 7, and a connecting rod 11 is installed at the four corner positions of the surface of the elastic pull plate 10, and all the connecting rods 11 are fixed obliquely upward to the lower surface of the mounting plate 12. A steel wire rope 13 is fixed at the center position of the upper surface of the mounting plate 12. The upper end of the steel wire rope 13 passes through the reversing roller 14 and turns outward and is connected to the piston rod of the telescopic cylinder 17. The non-rotating part of the lower end of the reversing roller 14 is connected to the telescopic connecting rod 15, and the lower end of the telescopic connecting rod 15 is fixed to the rotating part of the rotating seat 16. The non-rotating part of the rotating seat 16 is fixed to the upper surface of the base plate 4 by bolts.
[0023] like Figure 4 As shown, the telescopic cylinder 17 is embedded and fixed on the vertical section of the L-shaped side panel 18, and an air storage tank 19 is installed on the transverse section of the L-shaped side panel 18. The upper end of the air storage tank 19 is connected to the air inlet and outlet of the telescopic cylinder 17 through the air inlet and outlet pipes. The transverse section of the L-shaped side panel 18 is provided with a vertical connecting plate 20 at one end on the left side and the other end on the right side. The vertical connecting plate 20 is connected to the I-beam 5 on the corresponding side by bolts 9.
[0024] Specifically, before the T beam 1 is tensioned, Figure 1 As shown, the elastic device of the present application is installed so that the inner side surface of the elastic pad 7 is filled with the chamfered area of the T-beam 1. At the same time, several elastic telescopic rods 8 are in the maximum compression state, pressing the elastic pad 7 inward, and the steel wire rope 13 is tensioned by the piston rod of the telescopic cylinder 17 on the outside, pulling the elastic pull plate 10 obliquely upward. Through the elastic tensioning and tensioning on both sides and the outside, the anti-arch force and gravity of the beam body during the tensioning process are respectively supported in the reverse direction, reducing damage to the concrete at the bottom of the beam end and cracks or missing edges and corners. After the tensioning is completed, the elastic device can be removed and the concrete material can be filled in the chamfer to ensure the appearance integrity of the bottom of the side span beam end of the T-beam 1, eliminating the need for later manual repair work and saving manpower and material resources.
[0025] The standard parts used in this utility model can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.
[0026] The above shows and describes the basic principles and main features of the present invention, as well as the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.
Claims
1. An elastic device for preventing cracking at the bottom of a span end of a T-beam after tensioning, comprising a T-beam, the T-beam being arranged above a base plate for tensioning, the base plate being arranged on a steel pedestal, the side of the steel pedestal being machined with a plurality of through slots spaced apart, each of which passes through an I-beam, a tensioning anchor cable passing through the interior of the T-beam, and a tensioning jack being mounted on the outside of the anchor cable via a plate seat, characterized in that: The front and rear ends of the bottom of the T-beam side span are both provided with 5cm*8cm chamfers, and the chamfers are filled with elastic devices. The elastic devices include an outer plate and an L-shaped side plate with symmetrical left and right structures. The lower ends of both sides of the outer plate are extended outward with connecting plates, and the connecting plates and the steel pedestal are connected by bolts. Several elastic telescopic rods are laterally spaced inward from the upper end of the inner side of the outer plate, and the inner ends of the several elastic telescopic rods are connected to the outer side of the elastic pad.
2. The elastic device for preventing the bottom of the side span beam from cracking after the T beam is tensioned according to claim 1, characterized in that: The inner side surface of the elastic pad is an inclined surface and fills the chamfered area of the T-beam. The outer side surface of the elastic pad is a rectangular surface and extends to the outside of the bottom of the T-beam.
3. The elastic device for preventing the bottom of the side span end of a T-beam from cracking after tensioning according to claim 2, characterized in that: Elastic pull plates extend outward on both sides of the inclined surface of the inner side of the elastic pad, a connecting rod is installed at the four corners of the surface of the elastic pull plate, and all the connecting rods are fixed upward and obliquely to the lower surface of the mounting plate, a steel wire rope is fixed at the center position of the upper surface of the mounting plate, and the upper end of the steel wire rope passes through the reversing roller to turn outward and is connected to the piston rod of the telescopic cylinder.
4. The elastic device for preventing the bottom of the side span end of a T-beam from cracking after tensioning according to claim 3 is characterized in that: The non-rotating portion at the lower end of the reversing roller is connected with a telescopic connecting rod, the lower end of the telescopic connecting rod is fixed to the rotating portion of the rotating seat, and the non-rotating portion of the rotating seat is fixed to the upper surface of the base plate by bolts.
5. The elastic device for preventing the bottom of the side span beam from cracking after the T beam is tensioned according to claim 3, characterized in that: The telescopic cylinder is embedded and fixed on the vertical section of the L-shaped side panel, and an air storage tank is installed on the transverse section of the L-shaped side panel. The upper end of the air storage tank is connected to the air inlet and outlet of the telescopic cylinder through the air inlet and outlet pipes. The left end and the other right end of the transverse section surface of the L-shaped side panel are provided with vertical connecting plates, and the vertical connecting plates are connected to the I-beams on the corresponding sides by bolts.