Device for improving strength and rigidity of reinforced concrete T beam of bridge
By adding steel trusses to the old reinforced concrete T beams to form a steel-concrete composite structure, the problem of insufficient strength and stiffness of the old T beams is solved, and the double improvement of the structure and significant improvement of the bearing capacity is achieved.
Patent Information
- Application Number
- CN202421228934.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-05-31
AI Technical Summary
The existing technology is difficult to effectively improve the strength and stiffness of old reinforced concrete T-beams, resulting in a reduced load-bearing capacity and unable to meet the use needs.
By adding steel trusses to the existing reinforced concrete T-beam structure, a steel-concrete composite structure is formed, the tensile performance of the steel is fully utilized, and the strength and stiffness of the structure are simultaneously improved.
The dual improvement of the strength and stiffness of old T-beams has been achieved, which significantly improves the load-bearing capacity, reduces the live load effect, and improves the performance of the bridge.
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Figure CN222525199U_ABST
Abstract
Description
Technical field:
[0001] The utility model belongs to the technical field of bridge engineering, and in particular relates to a bridge reinforced concrete T-beam strength and rigidity improvement device. Background technology:
[0002] From the current T-beam structure, on the one hand, the load standard of the reinforced concrete T-beam designed in the early construction is low (car-20 level, trailer-100), the bridge beam height is also low, and the structural strength and stiffness redundancy are low. On the other hand, the T-beam designed in the early design adopts weak connection in the transverse connection (the connection of the diaphragm steel plate adopts simple welding, and the flange plate adopts hinged connection). In addition, with the development of society, under the action of heavy traffic, the prefabricated T-beam bridges built in the early construction have successively suffered from various diseases (T-beam structural cracks, failure of diaphragm connection, longitudinal cracking of the bridge deck, obvious structural vibration, etc.), and the bearing capacity has gradually decreased and even cannot meet the needs of use.
[0003] At present, the engineering community has unilaterally proposed conventional reinforcement methods for ordinary reinforced concrete prefabricated T-beams based on the insufficient strength of the existing defects, mainly including reinforcement by gluing steel plates, gluing carbon plates or increasing the cross-section. Due to the thickness of the web of the T-beam, the size of the gluing steel plate or prestressed carbon plate is limited, and the bearing capacity improvement is limited. In addition, the two reinforcement methods can only improve the structural strength of the T-beam, and the effect of improving the stiffness of the T-beam is negligible, and it cannot fully solve the service status of the old T-beam. Although the reinforcement method of increasing the cross-section can improve the stiffness of the T-beam, it will increase the dead load, which is not good for the original structure, and the strength improvement effect is not obvious. At the same time, the effective bonding structure of the steel plate combination enlarged cross-section and the original T-beam concrete is complex, and the construction feasibility is poor, which is easy to cause the failure of the reinforced section.
[0004] Based on the above, the utility model provides a reinforced concrete T-beam "strength and stiffness" dual enhancement reinforcement device to solve the above problems. Summary of the invention:
[0005] The purpose of the utility model is to provide a bridge reinforced concrete T-beam strength and stiffness improvement device in response to the problems existing in the prior art, use a steel-concrete composite structure to solve the live load sharing of old T-beams and improve the strength and stiffness of the reinforced composite structure, and by adding steel trusses to the existing reinforced concrete T-beam structure, give full play to the tensile performance of steel, simultaneously increase the structural strength and stiffness, and comprehensively improve the performance of the T-beam.
[0006] The utility model adopts the following technical solutions:
[0007] The utility model provides a bridge reinforced concrete T-beam strength and rigidity improving device, comprising a truss structure, wherein the truss structure is fixedly installed under the T-beam of the bridge.
[0008] Furthermore, the truss structure includes an upper chord mechanism, a supporting mechanism and a lower chord mechanism; the upper chord mechanism is fixedly connected to the lower edge of the T-beam web through a fixing device, and the lower chord mechanism is distributed below the upper chord mechanism and fixedly connected to the upper chord mechanism through the supporting mechanism.
[0009] Furthermore, the fixing device includes a first steel plate and two groups of second steel plates, the two groups of second steel plates are vertically fixed on one side of the first steel plate to form a U-shaped structure; the lower edge of the T-beam web is fixed between the two groups of second steel plates.
[0010] Furthermore, the lower edge of the T-beam web is fixedly connected to the two groups of second steel plates through a first anchor bolt, and is fixedly connected to the first steel plate through a second anchor bolt.
[0011] Furthermore, the upper chord mechanism includes several groups of upper chord rods / plates, and two adjacent groups of upper chord rods / plates are fixedly connected by a first node plate; the lower chord mechanism includes several groups of lower chord rods / plates, and two adjacent groups of lower chord rods / plates are fixedly connected by a second node plate.
[0012] Furthermore, the supporting mechanism includes several groups of vertical supporting members and diagonal braces; the vertical supporting member is vertically arranged, and its upper end is fixedly connected to the upper chord mechanism through a first node plate, and its lower end is fixedly connected to the lower chord mechanism through a second node plate; the diagonal brace is inclinedly arranged, and its upper end is fixedly connected to the upper chord mechanism through a third node plate, and its lower end is fixedly connected to the lower chord mechanism through a second node plate.
[0013] Furthermore, the first node plate includes two groups of parallel third steel plates and two groups of first fixed plates; the two groups of third steel plates are vertically fixedly connected to the lower surface of the fixing device, and the vertical support is arranged between the two groups of third steel plates and fixedly connected to the two groups of third steel plates; the two groups of first fixed plates are respectively fixedly connected to the two groups of third steel plates and symmetrically distributed on both sides of the vertical support, and the upper chord rod / plate is fixedly connected to the first fixed plate.
[0014] Furthermore, the second node plate includes a fourth steel plate, two groups of fifth steel plates and two groups of second fixed plates; the two groups of fifth steel plates are vertically fixedly installed on the upper surface of the fourth steel plate to form a U-shaped structure, and the lower edge of the vertical support is installed between the two groups of fifth steel plates and fixedly connected to the fifth steel plate and the fourth steel plate; the two groups of second fixed plates are respectively fixedly connected to the two groups of fifth steel plates and are symmetrically distributed on both sides of the vertical support, the lower chord / plate is fixedly connected to the second fixed plate, and the lower end of the diagonal brace is fixedly connected to the second fixed plate.
[0015] Furthermore, the third node plate is fixedly connected to the upper chord rod / plate, and the upper end of the diagonal brace is fixedly connected to the third node plate.
[0016] Furthermore, the first node plate, the second node plate and the third node plate are each provided with one or more groups of stiffening ribs.
[0017] Beneficial effects of the utility model:
[0018] (1) The utility model uses the theory of steel-concrete composite structure to solve the problem of live load sharing of old T-beams, improves the strength and stiffness of the reinforced composite structure, and adds steel trusses to the existing reinforced concrete T-beam structure to give full play to the tensile performance of steel, while increasing the structural strength and stiffness, thereby comprehensively improving the performance of T-beams and providing a new idea for improving the stiffness of old reinforced concrete T-beams.
[0019] (2) The reinforcement device of the utility model is light in weight, accounting for less than 5% of the original T-beam dead load. After adding the steel truss composite structure system, the live load effect borne by the original structure T-beam is reduced by more than 58.7%, the overall strength can be increased by 70.5%, and the stiffness can be increased by 151%, which greatly improves the performance of the bridge. Description of the drawings:
[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;
[0021] Figure 2 for Figure 1 A partial enlarged view of
[0022] Figure 3 It is a side view of an embodiment of the utility model;
[0023] The symbols in the accompanying drawings are:
[0024] 1. Upper chord mechanism; 1-1. Upper chord rod / plate; 2. Lower chord mechanism; 2-1. Lower chord rod / plate; 3. First steel plate; 4. Second steel plate; 5. First anchor bolt; 6. Second anchor bolt; 7. Vertical support member; 8. Diagonal brace; 9. First node plate; 10. Second node plate; 11. Third node plate; 12. Third steel plate; 13. First fixed plate; 14. Fourth steel plate; 15. Fifth steel plate; 16. Second fixed plate; 17. Pier; 18. Cap beam; 19. Lower edge of T-beam web. Specific implementation method:
[0025] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.
[0026] Example 1
[0027] Reference Figure 1 An embodiment of the utility model provides a device for improving the strength and stiffness of a reinforced concrete T-beam of a bridge, comprising a truss structure, wherein the truss structure is fixedly installed under the T-beam of the bridge.
[0028] In this embodiment, the truss structure includes an upper chord mechanism 1, a supporting mechanism and a lower chord mechanism 2; the upper chord mechanism 1 is fixedly connected to the lower edge of the T-beam web through a fixing device, and the lower chord mechanism 2 is distributed below the upper chord mechanism 1 and fixedly connected to the upper chord mechanism 1 through a supporting mechanism.
[0029] Example 2
[0030] The main structure of this embodiment is the same as that of Embodiment 1, except that this embodiment limits the structure of the fixing device.
[0031] Specifically, refer to Figure 1 The fixing device includes a first steel plate 3 and two groups of second steel plates 4. The two groups of second steel plates 4 are vertically fixed on one side of the first steel plate 3 to form a U-shaped structure; the lower edge of the T-beam web is fixed between the two groups of second steel plates 4.
[0032] In this embodiment, the lower edge of the web of the T-beam is connected to the first steel plate 3 and the two sets of second steel plates 4 by means of structural adhesive, and is realized by forming a U-shaped outer steel plate by means of anchor bolt anchoring technology. Specifically, the first anchor bolt 5 is fixedly connected to the two sets of second steel plates 4, and is fixedly connected to the first steel plate 3 by means of the second anchor bolt 6.
[0033] Example 3
[0034] The main structure of this embodiment is the same as that of Embodiment 2, except that this embodiment limits the structures of the upper string mechanism 1, the lower string mechanism 2 and the supporting mechanism.
[0035] Specifically, refer to Figures 1 to 3 In this embodiment, the upper chord mechanism 1 includes several groups of upper chord rods / plates 1-1, and two adjacent groups of upper chord rods / plates 1-1 are fixedly connected by a first node plate 9; the lower chord mechanism 2 includes several groups of lower chord rods / plates 2-1, and two adjacent groups of lower chord rods / plates 2-1 are fixedly connected by a second node plate 10.
[0036] In this embodiment, the support mechanism includes several groups of vertical support members 7 and diagonal braces 8; the vertical support member 7 is vertically arranged, and its upper end is fixedly connected to the upper chord mechanism 1 through the first node plate 9, and its lower end is fixedly connected to the lower chord mechanism 2 through the second node plate 10; the diagonal brace 8 is inclinedly arranged, and its upper end is fixedly connected to the upper chord mechanism 1 through the third node plate 11, and its lower end is fixedly connected to the lower chord mechanism 2 through the second node plate 10.
[0037] Example 4
[0038] The main structure of this embodiment is the same as that of Embodiment 3, except that: this embodiment limits the structures of the first node plate 9, the second node plate 10 and the third node plate 11.
[0039] Specifically, refer to Figure 2 In this embodiment, the first node plate 9 includes two groups of parallel third steel plates 12 and two groups of first fixed plates 13; the two groups of third steel plates 12 are vertically fixedly connected to the lower surface of the fixing device, and the vertical support member 7 is arranged between the two groups of third steel plates 12 and fixedly connected to the two groups of third steel plates 12; the two groups of first fixed plates 13 are respectively fixedly connected to the two groups of third steel plates 12, and are symmetrically distributed on both sides of the vertical support member 7, and the upper chord rod / plate 1-1 is fixedly connected to the first fixed plate 13.
[0040] In this embodiment, the second node plate 10 includes a fourth steel plate 14, two groups of fifth steel plates 15 and two groups of second fixed plates 16; the two groups of fifth steel plates 15 are vertically fixedly installed on the upper surface of the fourth steel plate 14 to form a U-shaped structure, and the lower edge of the vertical support member 7 is installed between the two groups of fifth steel plates 15, and is fixedly connected to the fifth steel plate 15 and the fourth steel plate 14; the two groups of second fixed plates 16 are respectively fixedly connected to the two groups of fifth steel plates 15, and are symmetrically distributed on both sides of the vertical support member 7, the lower chord / plate 2-1 is fixedly connected to the second fixed plate 16, and the lower end of the diagonal brace 8 is fixedly connected to the second fixed plate 16.
[0041] In this embodiment, the third node plate 11 is fixedly connected to the upper chord / plate 1-1, and the upper end of the diagonal brace 8 is fixedly connected to the third node plate 11. In this embodiment, one or more groups of stiffening ribs are provided on the first node plate 9, the second node plate 10 and the third node plate 11 to improve the strength of the device.
[0042] A typical 20m span reinforced concrete T-beam bridge was selected, and the 20m T-beam of the upper structure was transformed and reinforced using this scheme for actual bridge verification. Under the same vehicle load condition, the deflection value of the combined system was smaller after adding the steel truss (Table 1).
[0043] Table 1-20m T beam deflection value under loading condition
[0044] Beam No. Unreinforced(m) Steel plate reinforcement (m) Steel truss reinforcement (m) 6#(Inner side beam) -0.00223 -0.00431 -0.00372 5# -0.00683 -0.00637 -0.00533 4# -0.00954 -0.00685 -0.00603 3# -0.01221 -0.00864 -0.00779 2# -0.0108 -0.00966 -0.00903 1#(outer beam) -0.00661 -0.01007 -0.00983
[0045] The utility model forms a steel-concrete composite system by adding steel trusses, gives full play to the tensile performance of the steel structure and the compressive performance of the original T-beam concrete, increases the overall cross-sectional height of the composite structure, and achieves improved strength and rigidity of the reinforced structural system.
[0046] The above are only preferred implementations of the present utility model. The protection scope of the present utility model is not limited to the above embodiments. All technical solutions under the concept of the present utility model belong to the protection scope of the present utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present utility model should be regarded as the protection scope of the present utility model.
Claims
1. A bridge reinforced concrete T-beam strength and stiffness improvement device, characterized in that: The invention comprises a truss structure which is fixedly installed under the T-beam of the bridge.
2. The bridge reinforced concrete T-beam strength and stiffness improvement device according to claim 1 is characterized in that: The truss structure comprises an upper chord mechanism (1), a supporting mechanism and a lower chord mechanism (2); The upper chord mechanism (1) is fixedly connected to the lower edge of the web of the T-beam via a fixing device, and the lower chord mechanism (2) is distributed below the upper chord mechanism (1) and is fixedly connected to the upper chord mechanism (1) via a supporting mechanism.
3. The bridge reinforced concrete T-beam strength and rigidity improvement device according to claim 2 is characterized in that: The fixing device comprises a first steel plate (3) and two groups of second steel plates (4), wherein the two groups of second steel plates (4) are vertically fixedly installed on one side of the first steel plate (3) to form a U-shaped structure; The lower edge of the T-beam web is fixedly installed between two groups of second steel plates (4).
4. The bridge reinforced concrete T-beam strength and rigidity improvement device according to claim 3 is characterized in that: The lower edge of the web of the T-beam is fixedly connected to the two groups of second steel plates (4) via a first anchor bolt (5), and is fixedly connected to the first steel plate (3) via a second anchor bolt (6).
5. The bridge reinforced concrete T-beam strength and rigidity improvement device according to claim 2 is characterized in that: The upper chord mechanism (1) comprises a plurality of groups of upper chord rods / plates (1-1), and two adjacent groups of upper chord rods / plates (1-1) are fixedly connected via a first node plate (9); The lower chord mechanism (2) comprises a plurality of groups of lower chord rods / plates (2-1), and two adjacent groups of lower chord rods / plates (2-1) are fixedly connected via a second node plate (10).
6. The bridge reinforced concrete T-beam strength and rigidity improvement device according to claim 5 is characterized in that: The support mechanism comprises a plurality of groups of vertical support members (7) and diagonal supports (8); The vertical support member (7) is arranged vertically, and its upper end is fixedly connected to the upper chord mechanism (1) through a first node plate (9), and its lower end is fixedly connected to the lower chord mechanism (2) through a second node plate (10); The diagonal brace (8) is arranged obliquely, and its upper end is fixedly connected to the upper chord mechanism (1) through a third node plate (11), and its lower end is fixedly connected to the lower chord mechanism (2) through a second node plate (10).
7. The bridge reinforced concrete T-beam strength and rigidity improvement device according to claim 6 is characterized in that: The first node plate (9) comprises two sets of parallel third steel plates (12) and two sets of first fixing plates (13); The two groups of third steel plates (12) are vertically fixedly connected to the lower surface of the fixing device, and the vertical support member (7) is arranged between the two groups of third steel plates (12) and is fixedly connected to the two groups of third steel plates (12); The two groups of first fixed plates (13) are respectively fixedly connected to the two groups of third steel plates (12) and are symmetrically distributed on both sides of the vertical support member (7). The upper chord rod / plate (1-1) is fixedly connected to the first fixed plate (13).
8. The bridge reinforced concrete T-beam strength and rigidity improvement device according to claim 6 is characterized in that: The second node plate (10) comprises a fourth steel plate (14), two groups of fifth steel plates (15) and two groups of second fixing plates (16); The two groups of fifth steel plates (15) are vertically fixedly installed on the upper surface of the fourth steel plate (14) to form a U-shaped structure, and the lower edge of the vertical support member (7) is installed between the two groups of fifth steel plates (15) and is fixedly connected to the fifth steel plate (15) and the fourth steel plate (14); The two groups of second fixed plates (16) are respectively fixedly connected to the two groups of fifth steel plates (15) and are symmetrically distributed on both sides of the vertical support member (7); the lower chord / plate (2-1) is fixedly connected to the second fixed plate (16); and the lower end of the diagonal brace (8) is fixedly connected to the second fixed plate (16).
9. The bridge reinforced concrete T-beam strength and rigidity improvement device according to claim 6 is characterized in that: The third node plate (11) is fixedly connected to the upper chord rod / plate (1-1), and the upper end of the diagonal brace (8) is fixedly connected to the third node plate (11).
10. The bridge reinforced concrete T-beam strength and rigidity improvement device according to claim 6, characterized in that: The first node plate (9), the second node plate (10) and the third node plate (11) are each provided with one or more groups of stiffening ribs.