Ultralow-beam-height T-beam structure suitable for widening bridge

Abstract

The utility model provides an ultra-low beam height T beam structure suitable for widening a bridge, which comprises a top plate and a web plate arranged below the top plate, a haunch is arranged between the top plate and the web plate, a plurality of steel beams are arranged in the top plate and the web plate, the steel beams are arranged along the length direction of the web plate, and the plurality of steel beams are transversely arranged. By increasing the width of the web, reducing the total height of the web and the top plate and transversely arranging a plurality of steel bundles in the web, the purpose of reducing the overall height of the T-beam on the premise of ensuring the strength of the T-beam is achieved, and the problem that the T-beam exceeds the beam height limit is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge structures, in particular to an ultra-low beam height T-beam structure suitable for widened bridges. Background Art

[0002] The T-beam, also known as the T-shaped beam, is a beam with a T-shaped cross-section and belongs to a statically determinate structure. Its upper flange has a large flexural stiffness, while the lower rib provides a large shear strength. When the T-beam is used in the construction of widened bridges, due to the problems of upper structure beam height limitation caused by flood level, road longitudinal section control, and the limitation of the original lower structure in the reconstruction and expansion of old bridges, the overall height of the T-beam is greatly restricted.

[0003] Chinese Patent CN202120841585 discloses a post-tensioned prestressed double T-beam, including: a top plate; and two webs symmetrically arranged below the top plate and integrally cast with the top plate; wherein, a plurality of downward concave curved through holes are reserved along the length direction of the web, steel cables are arranged in the plurality of through holes, the ports of the plurality of through holes are longitudinally arranged along the height direction at the end face of the web, and the middle parts of the plurality of through holes are arranged side by side along the width direction in the web. By adopting an integral structure, it is convenient for transportation and can improve the bridge construction efficiency.

[0004] However, the T-beam in this technical solution has a relatively high height and cannot meet the design requirements of the low beam height scheme. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an ultra-low beam height T-beam structure suitable for widened bridges for the deficiencies of the prior art. By increasing the width of the web, reducing the total height of the web and the top plate, and cooperating with the transverse arrangement of several steel bundles in the web, the purpose of reducing the overall height of the T-beam while ensuring the strength of the T-beam is achieved, and the problem of the T-beam exceeding the beam height limit is solved.

[0006] To achieve the above purpose, the utility model provides the following technical solution:

[0007] An ultra-low beam height T-beam structure suitable for widened bridges includes a top plate and a web arranged below the top plate. A haunch is arranged between the top plate and the web, and several steel bundles are installed in the top plate and the web. The steel bundles are arranged along the length direction of the web, and several of the steel bundles are arranged horizontally.

[0008] Preferably, the width of the web is 60 - 70 cm, and the total height of the web and the top plate above it is not greater than 45 cm.

[0009] As an optimization, the steel tendons are prestressed steel tendons, including inclined segments arranged on both sides in the length direction of the web, a horizontal segment arranged in the middle in the length direction of the web, and a transition segment connecting the inclined segment and the horizontal segment.

[0010] As an optimization, both the inclined segment and the horizontal segment are straight segments, and the included angle between the inclined segment and the horizontal plane ranges from 1.8° to 2°.

[0011] As an optimization, the outer end of the inclined segment is 20 - 30 cm away from the bottom surface of the web, and the horizontal segment is 10 - 14 cm away from the bottom surface of the web.

[0012] As an optimization, the transition segment is an arc segment, and is tangent to the inclined segment and the horizontal segment respectively, and its bending point is 1 meter away from the mid-span of the T-beam.

[0013] As an optimization, the steel tendons are composed of several steel bars with a diameter of 15.2 mm.

[0014] As an optimization, several of the steel tendons are symmetrically arranged along the center line of the web.

[0015] As an optimization, the haunch is arranged along the length direction of the web, and its width ranges from 10 - 14 cm.

[0016] As an optimization, the top plate, the web and the haunch are integrally cast.

[0017] The beneficial effects of the present utility model are as follows:

[0018] (1) By arranging the steel tendons horizontally, the present utility model saves the longitudinal installation space, so that the total height of the web and the top plate above it can be limited within 45 cm, greatly reducing the overall height of the T-beam and meeting the ultra-low beam height design requirements of the widened bridge.

[0019] (2) Through the refined design of dividing the steel tendons into inclined segments, horizontal segments and transition segments, the present utility model ensures the uniform distribution of the tensile force, avoids stress concentration, improves the safety and durability of the structure, extends the service life of the main beam, and reduces the maintenance cost of the main beam throughout its life cycle.

[0020] (3) By shortening the width of the haunch, the present utility model optimizes the transverse layout of the cross-section, facilitating formwork layout and construction.

[0021] In summary, the present utility model has the advantages of low height, high strength, good safety and durability, etc., and can meet the ultra-low beam height design requirements of the widened bridge. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the end structure of the present utility model;

[0023] Figure 2 Schematic cross-sectional structure diagram of the present utility model;

[0024] Figure 3 Schematic diagram of the arrangement position of the steel tendons of the present utility model;

[0025] Figure 4 Schematic diagram of the combined installation structure of the present utility model. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0028] Embodiment

[0029] As Figures 1-4 shown, this embodiment provides an ultra-low beam height T-beam structure suitable for widened bridges, including a top plate 1 and a web 2 arranged below the top plate 1. A haunch 3 is arranged between the top plate 1 and the web 2. A plurality of steel tendons 4 are installed in the top plate 1 and the web 2. The steel tendons 4 are arranged along the length direction of the web 2, and a plurality of the steel tendons 4 are arranged horizontally. The width of the web 2 is 60-70 cm, and the total height of the web 2 and the top plate 1 above it is not greater than 45 cm. Increasing the width of the web 2 improves the flexural and shear bearing capacities of the T-beam, and reduces the overall height of the T-beam on the premise of ensuring the strength of the T-beam.

[0030] By arranging the steel tendons 4 horizontally, the longitudinal installation space is saved, enabling the total height of the web 2 and the top plate 1 above it to be limited within 45 cm, greatly reducing the overall height of the T-beam and meeting the ultra-low beam height design requirements of the widened bridge.

[0031] As Figures 1-3 shown, the steel tendons 4 are prestressed steel tendons. In this embodiment, two steel tendons 4 are symmetrically arranged left and right in the T-beam cross-section, including inclined segments 41 arranged on both sides in the length direction of the web 2, horizontal segments 42 arranged in the middle in the length direction of the web 2, and transition segments 43 connecting the inclined segments 41 and the horizontal segments 42. Both the inclined segments 41 and the horizontal segments 42 are straight segments, and the included angle between the inclined segment 41 and the horizontal plane ranges from 1.8° to 2°. The outer end of the inclined segment 41 is 20 - 30 cm away from the bottom surface of the web 2, and the horizontal segment 42 is 10 - 14 cm away from the bottom surface of the web 2. The transition segment 43 is an arc segment and is tangent to the inclined segment 41 and the horizontal segment 42 respectively, and its bending point is 1 meter away from the mid-span of the T-beam to improve the shear bearing capacity of the main beam under the low beam height.

[0032] Through the refined design of dividing the steel tendon 4 into the inclined segment 41, the horizontal segment 42, and the transition segment 43, the uniform distribution of the tension force is ensured, the stress concentration phenomenon is avoided, the safety and durability of the structure are improved, the service life of the main beam is extended, and the maintenance cost of the main beam over the entire life cycle is reduced.

[0033] Furthermore, the steel tendon 4 is composed of several steel bars with a diameter of 15.2 mm. In this embodiment, 9 such steel bars are used for the steel tendon 4 to improve the flexural bearing capacity of the main beam.

[0034] As Figure 3 shown, several steel tendons 4 are symmetrically arranged along the center line of the web 2 to balance the forces on both sides of the steel tendon 4.

[0035] Furthermore, the haunch 3 is arranged along the length direction of the web 2, and its width range is 10 - 14 cm.

[0036] By shortening the width of the haunch 3, the transverse layout of the cross-section is optimized, facilitating the formwork layout and construction.

[0037] As Figure 1 、 2 shown, the T-beam mentioned in this embodiment is a precast component, and the top plate 1, the web 2, and the haunch 3 are integrally cast.

[0038] As Figure 4 shown, the T-beams are evenly arranged left and right during installation, erected on the cross beam, and the top plates 1 between adjacent T-beams are connected by cast-in-place method.

[0039] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An ultra-low beam height T-beam structure suitable for widening bridges, characterized in that, It includes a top plate (1) and a web (2) arranged below the top plate (1). There is a haunch (3) between the top plate (1) and the web (2). A number of steel tendons (4) are installed in the top plate (1) and the web (2). The steel tendons (4) are arranged along the length direction of the web (2), and a number of the steel tendons (4) are arranged horizontally in a row.

2. The ultra-low beam height T-beam structure suitable for widening bridges according to claim 1, characterized in that, The width of the web (2) is 60 - 70 cm, and the total height of the web (2) and the top plate (1) above it is not greater than 45 cm.

3. The ultra-low beam height T-beam structure suitable for widened bridges according to claim 1, characterized in that, The steel tendon (4) is a prestressed steel tendon, which includes inclined sections (41) arranged on both sides in the length direction of the web (2), a horizontal section (42) arranged in the middle in the length direction of the web (2), and a transition section (43) connecting the inclined section (41) and the horizontal section (42).

4. The ultra-low beam height T-beam structure suitable for widening bridges according to claim 3, characterized in that, Both the inclined section (41) and the horizontal section (42) are straight sections, and the included angle between the inclined section (41) and the horizontal plane ranges from 1.8° to 2°.

5. The ultra-low beam height T-beam structure suitable for widened bridges according to claim 4, characterized in that, The outer end of the inclined section (41) is 20 - 30 cm away from the bottom surface of the web (2), and the horizontal section (42) is 10 - 14 cm away from the bottom surface of the web (2).

6. The ultra-low beam height T-beam structure suitable for widening bridges according to claim 3, characterized in that The transition section (43) is an arc section, and is tangent to the inclined section (41) and the horizontal section (42) respectively. Its bending point is 1 meter away from the mid-span of the T-beam.

7. The ultra-low beam height T-beam structure suitable for widened bridges according to claim 1, characterized in that, The steel tendon (4) is composed of a number of steel bars with a diameter of 15.2 mm.

8. The ultra-low beam height T-beam structure suitable for widening bridges according to claim 1, characterized in that, A number of the steel tendons (4) are symmetrically arranged along the center line of the web (2).

9. The ultra-low beam height T-beam structure suitable for widening bridges according to claim 1, characterized in that, The haunch (3) is arranged along the length direction of the web (2), and its width range is 10 - 14 cm.

10. The ultra-low beam height T-beam structure suitable for widening bridges according to claim 1, characterized in that, The top plate (1), the web (2) and the haunch (3) are integrally cast.

Images