A stiffened longitudinal beam structure and construction method for enhancing the robustness of a mid-through arch suspension bridge system

Abstract

The present invention belongs to the technical field of bridge engineering, and more particularly to a stiffened longitudinal beam structure and a construction method thereof for enhancing the robustness of a suspension bridge system of a mid-span arch bridge. The present invention achieves the effect of installing a stiffened longitudinal beam structure between two crossbeams by socketing a large tube unit and a small tube unit, inserting a support tube unit, and installing an anchoring steel plate unit. The present invention has the advantages of light weight, high rigidity, and easy connection of a steel structure stiffened longitudinal beam, greatly improving the overall rigidity and stability of the suspension bridge system, fully releasing the inconsistent deformation of the bridge deck and the stiffened longitudinal beam caused by temperature changes, being able to withstand the impact force caused by the breakage of the hanger rod over a certain length, and enhancing the robustness of the suspension bridge system, which can effectively avoid the occurrence of major accidents and has good economic value and social effects.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a stiffened longitudinal beam structure and a construction method thereof for enhancing the robustness of a suspension bridge system of a mid-through arch bridge. Background Art

[0002] At present, the design of suspension bridge system of mid-span arch bridge in my country is not based on the stress of reinforced longitudinal beams, but on the stress of transverse beams. The hangers are also anchored at both ends of the transverse beams, and then the bridge deck is laid on the transverse beams. Most of the transverse beams do not have reinforced longitudinal beams. After several years of operation, the suspension bridge system of the built mid-span arch bridge has many diseases, such as excessive vibration of the bridge deck, serious damage to the bridge deck, and falling off of the bearings.

[0003] Many scholars have conducted in-depth research on how to improve the safety factor of suspension bridge systems. Most of the research focuses on the safety performance of the hanger, and proposes to improve the layout of the hanger to ensure the safe operation of the hanger. However, due to the lack of sufficient rigidity of the suspension bridge system itself, the construction problems of the hanger, and the serious overload phenomenon, the hangers in the suspension bridge system still have serious safety hazards, such as deformation and rust of the anchor head, cracking of the sheath, rust of the cable body, stress corrosion, etc., so that the possibility of sudden breakage of the hanger still exists.

[0004] Therefore, it is necessary to design a stiffened longitudinal beam structure and its construction method that has light weight, reasonable structural force, convenient construction, excellent durability, and strong economy and practicality to enhance the robustness of the suspension bridge system of a mid-span arch bridge. This structure can effectively solve the problems of insufficient overall stiffness and poor stability of the suspension bridge system of a mid-span arch bridge, and can withstand the impact force caused by the breakage of the hanger at a certain length, thereby enhancing the robustness of the suspension bridge system.

[0005] A Chinese invention patent with patent publication number CN111945541A and publication date 2020.11.17 discloses a mid-span tie-arch bridge, including piers, supports, a first steel box main arch rib, a second steel box main arch rib, a first steel box secondary arch rib, a second steel box secondary arch rib, an arch-beam combination, a balancing arch, a main beam, a main arch, an arch rib connector and a transverse connector. Two piers are symmetrically arranged, and the main arches are symmetrically arranged on the piers. One end of the first steel box main arch rib is connected to one of the main arches on one of the piers, and the other end of the first steel box main arch rib is connected to the corresponding main arch on the other pier. The two ends of the first steel box secondary arch rib are correspondingly arranged at the two ends of the first steel box main arch rib. The first steel box secondary arch rib and the first steel box main arch rib are connected by an arch rib connector, and the second steel box main arch rib is connected to the corresponding main arch on one of the piers.

[0006] However, the mid-span tie-arch bridge in this invention patent has problems of unreasonable structural stress and poor overall durability. Summary of the invention

[0007] The purpose of the present invention is to provide a stiffening longitudinal beam structure and a construction method thereof for enhancing the robustness of the suspension bridge system of a mid-span arch bridge, which can achieve the effect of installing a stiffening longitudinal beam structure between two crossbeams by mutually socketing large pipe units and small pipe units, inserting support pipe units, and installing anchor steel plate units. The present invention has the advantages of light weight, high rigidity, and easy connection of the steel structure stiffening longitudinal beam, greatly improving the overall rigidity and stability of the suspension bridge system, fully releasing the inconsistent deformation of the bridge deck and the stiffening longitudinal beam caused by temperature changes, being able to withstand the impact force caused by the breakage of the hanger rod over a certain length, and enhancing the robustness of the suspension bridge system, which can effectively avoid the occurrence of major accidents and has good economic value and social effects.

[0008] The technical solution adopted by the present invention to solve the above-mentioned problem is: a stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge system of a mid-span arch bridge, comprising a large tube unit and a small tube unit which are mutually sleeved, and two anchoring steel plate units which are respectively arranged on the outer ends of the large tube unit and the small tube unit and are used to connect the cross beam.

[0009] A further preferred technical solution is that the large tube unit includes a large tube body, and a baffle arranged at one end of the large tube body and used to fit the small tube unit; the small tube unit includes a small tube body with one end inserted into the large tube body and the outer annular surface fitting the baffle, and an anti-falling steel plate arranged on the insertion end of the small tube body and fitting the inner annular surface of the large tube body.

[0010] A further preferred technical solution is that the large tube unit also includes an outer annular stiffening plate arranged on the outer side of the baffle and on the outer annular surface of the large tube body, and an outer longitudinal stiffening plate arranged between several of the outer annular stiffening plates; the small tube unit also includes an inner annular stiffening plate arranged on the inner annular surface of the small tube body, and an inner longitudinal stiffening plate arranged between several of the inner annular stiffening plates and between the inner annular stiffening plate and the anti-falling steel plate.

[0011] A further preferred technical solution is that a coating for friction during plugging is provided on the inner annular surface of the large tube body and the outer annular surface of the small tube body.

[0012] A further preferred technical solution is that a supporting tube unit is provided inside the large tube body, outside the small tube body and between the baffle and the anti-falling steel plate.

[0013] A further preferred technical solution is that the support tube unit includes an elastic ring sleeved between the large tube body and the small tube body, two support tube bodies respectively arranged on both sides of the elastic ring, and compression springs arranged on the relatively outer sides of the two support tube bodies and respectively used to lift the support tube body on the baffle and on the anti-falling steel plate.

[0014] A further preferred technical solution is that the thickness of the support tube body is 90-95% of the distance between the inner annular surface of the large tube body and the outer annular surface of the small tube body, and the length of the support tube body is 35-48% of the insertion length of the large tube body and the small tube body.

[0015] A further preferred technical solution is that the insertion length between the large tube body and the small tube body is greater than twice the outer diameter of the large tube body.

[0016] A further preferred technical solution is that the anchoring steel plate unit includes an anchoring steel plate body arranged on the relatively distant end of the large tube body or the small tube body, a stiffening steel plate arranged on the anchoring steel plate body and used to connect the outer annular surface of the large tube body or the small tube body, and a screw hole arranged on the anchoring steel plate body and used to insert a crossbeam threaded steel bar or a crossbeam screw rod.

[0017] A construction method for a stiffened longitudinal beam structure for enhancing the robustness of a mid-through arch bridge suspension bridge system comprises the following steps in sequence:

[0018] S1, welding the small tube body, the anti-falling steel plate, the inner annular stiffening plate and the inner longitudinal stiffening plate into a whole, and coating the coating on the inner annular surface of the small tube body to obtain the small tube unit;

[0019] S2, firstly apply the coating on the inner annular surface of the large tube body, and then insert the small tube unit and the supporting tube unit in sequence to obtain a stiffened longitudinal beam structure matrix;

[0020] S3, welding the baffle, the outer annular stiffening plate and the outer longitudinal stiffening plate on the large tube body to obtain a stiffened longitudinal beam structure body;

[0021] S4, welding the anchoring steel plate units at both ends of the small tube body and the large tube body to obtain the final stiffening longitudinal beam structure,

[0022] S5. Connect and install the stiffening longitudinal beam structure and the cross beam by bolting and welding to complete the entire construction operation.

[0023] The present invention achieves the effect of installing a stiffening longitudinal beam structure between two cross beams by mutually sleeve-connecting a large pipe unit and a small pipe unit, inserting a supporting pipe unit, and installing an anchoring steel plate unit. The present invention has the advantages of light weight, high rigidity, and easy connection of the steel structure stiffening longitudinal beam, greatly improving the overall rigidity and stability of the suspension bridge system, fully releasing the inconsistent deformation of the bridge deck and the stiffening longitudinal beam caused by temperature changes, being able to withstand the impact force caused by the breakage of the hanger rod at a certain length, and enhancing the robustness of the suspension bridge system, which can effectively avoid the occurrence of major accidents and has good economic value and social effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention.

[0025] Figure 2 It is a structural schematic diagram of the socket connection position of the large tube unit and the small tube unit in the present invention.

[0026] Figure 3 It is a schematic diagram of the position structure of the anchoring steel plate unit in the present invention.

[0027] Figure 4 It is a schematic diagram of the use of the stiffening longitudinal beam structure in the present invention. DETAILED DESCRIPTION

[0028] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention.

[0029] Example: As attached Figure 1 , 2 , 3 and attached Figure 4 As shown, a stiffening longitudinal beam structure for enhancing the robustness of the mid-span arch suspension bridge system includes a large tube unit 1 and a small tube unit 2 which are mutually sleeved, and two anchoring steel plate units 3 which are respectively arranged on the outer ends of the large tube unit 1 and the small tube unit 2 and are used to connect the cross beam 11.

[0030] In this embodiment, the cross beam 11 is installed with hangers 13 at both ends in accordance with the prior art to support the bridge deck 12, and the stiffening longitudinal beam structure is arranged between the cross beams 11 to ensure that the entire suspension bridge system has greater robustness and has the advantages of high rigidity and stability.

[0031] Among them, the large tube unit 1 and the small tube unit 2 are mutually socketed, and are the main body of the stiffened longitudinal beam structure, so that the stiffened longitudinal beam structure: first, has sufficient longitudinal strength; second, allows appropriate longitudinal deformation, and ultimately increases the bending stiffness of the bridge system, and can withstand the impact force caused by the breakage of the hanger 13 at a certain length, thereby enhancing the robustness of the suspension bridge system, and the anchoring steel plate unit 3 is the installation part between the stiffened longitudinal beam structure and the cross beam 11, ensuring that the two ends of the stiffened longitudinal beam structure are firmly installed and not easy to fall off.

[0032] The large tube unit 1 includes a large tube body 101, and a baffle 102 arranged at one end of the large tube body 101 and used to fit the small tube unit 2; the small tube unit 2 includes a small tube body 201 with one end inserted into the large tube body 101 and the outer annular surface fitting the baffle 102, and an anti-falling steel plate 202 arranged on the insertion end of the small tube body 201 and fitting the inner annular surface of the large tube body 101.

[0033] In this embodiment, the anti-falling steel plate 202 is pre-welded to the large tube body 101 as a whole, and then inserted into the large tube body 101. Finally, the baffle 102 is welded and fixed to the large tube body 101, thus forming an overall structure of "large inside and small outside" to achieve the above-mentioned anti-falling effect.

[0034] The baffle 102 may be a whole circular ring or an arc-shaped block with inner and outer arc-shaped surfaces, so as to ensure that the small tube body 201 and the anti-dropping steel plate 202 as a whole will not fall out of the large tube body 101 .

[0035] In addition, the large tube body 101 and the small tube body 201 can be round steel tubes, square steel tubes or triangular steel tubes.

[0036] The large tube unit 1 also includes an outer annular stiffening plate 103 arranged on the outer side of the baffle 102 and on the outer annular surface of the large tube body 101, and an outer longitudinal stiffening plate 104 arranged between several of the outer annular stiffening plates 103; the small tube unit 2 also includes an inner annular stiffening plate 203 arranged on the inner annular surface of the small tube body 201, and an inner longitudinal stiffening plate 204 arranged between several of the inner annular stiffening plates 203 and between the inner annular stiffening plate 203 and the anti-falling steel plate 202.

[0037] In this embodiment, the structures composed of the outer annular stiffening plate 103 and the outer longitudinal stiffening plate 104, and the inner annular stiffening plate 203 and the inner longitudinal stiffening plate 204 have the same purpose, which is to improve the annular structural strength and longitudinal structural strength of the pipe openings of the large tube body 101 and the small tube body 201, so that when the sleeve position is subjected to force and bends downward, the two pipe opening positions are not easily deformed, thereby ensuring the overall structural stiffness of the stiffened longitudinal beam structure.

[0038] The inner annular surface of the large tube body 101 and the outer annular surface of the small tube body 201 are provided with a coating 4 for friction during plugging.

[0039] In this embodiment, the material of the coating 4 is an existing rust-proof, wear-resistant and lubricating coating, which ensures that the steel structure stiffening longitudinal beam can freely expand and contract longitudinally under the influence of temperature changes.

[0040] A support tube unit 5 is further provided inside the large tube body 101, outside the small tube body 201 and between the baffle 102 and the anti-dropping steel plate 202. The support tube unit 5 includes an elastic ring 501 sleeved between the large tube body 101 and the small tube body 201, two support tube bodies 502 respectively arranged on both sides of the elastic ring 501, and a compression spring 503 arranged on the opposite outer sides of the two support tube bodies 502 and used to push up the support tube body 502 on the baffle 102 and on the anti-dropping steel plate 202 respectively. The thickness of the support tube body 502 is 90-95% of the distance between the inner annular surface of the large tube body 101 and the outer annular surface of the small tube body 201, and the length of the support tube body 502 is 35-48% of the plug-in length of the large tube body 101 and the small tube body 201.

[0041] In this embodiment, the stiffened longitudinal beam structure will have two deformation situations. The first is the overall expansion and contraction with the change of temperature, and the second is the downward bending deformation due to pressure. When the latter is deformed, the "hollow section" between the baffle 102 and the anti-falling steel plate 202 will appear to be insufficient in strength. Therefore, the support pipe unit 5 is introduced to ensure that the plug-in structure of the large pipe body 101 and the small pipe body 201 can have a sufficient allowable downward bending deformation range without bending and breaking.

[0042] The steel tube of the supporting tube body 502 and the elastic ring 501 are made of existing high-strength engineering plastics, and the compression spring 503 is an existing high-strength steel spring.

[0043] The insertion length between the large tube body 101 and the small tube body 201 is greater than twice the outer diameter of the large tube body 101 .

[0044] In this embodiment, the plug-in length is sufficient and appropriate, and combined with the anti-dropping steel plate 202 of appropriate size, the stability of the plug-in structure and sufficient bending margin can be ensured.

[0045] The anchoring steel plate unit 3 includes an anchoring steel plate body 301 arranged on the relatively distant end of the large tube body 101 or the small tube body 201, a stiffening steel plate 302 arranged on the anchoring steel plate body 301 and used to connect the outer annular surface of the large tube body 101 or the small tube body 201, and a screw hole 303 arranged on the anchoring steel plate body 301 and used to insert a crossbeam threaded steel bar or a crossbeam screw.

[0046] In this embodiment, the beam threaded steel bars can be fixed on the concrete beam 11, or inserted into the reserved holes of the beam 11, and finally fastened with nuts to ensure that the anchor steel plate body 301 is fixed on the beam 11 with high strength.

[0047] A construction method for a stiffened longitudinal beam structure for enhancing the robustness of a mid-through arch bridge suspension bridge system comprises the following steps in sequence:

[0048] S1, welding the small tube body 201, the anti-falling steel plate 202, the inner annular stiffening plate 203 and the inner longitudinal stiffening plate 204 into a whole, and coating the coating 4 on the inner annular surface of the small tube body 201 to obtain the small tube unit 2;

[0049] S2, firstly apply the coating 4 on the inner annular surface of the large tube body 101, and then insert the small tube unit 2 and the supporting tube unit 5 in sequence to obtain a stiffened longitudinal beam structure matrix;

[0050] S3, welding the baffle 102, the outer annular stiffening plate 103 and the outer longitudinal stiffening plate 104 on the large tube body 101 to obtain a stiffened longitudinal beam structure body;

[0051] S4, welding the anchoring steel plate unit 3 at both ends of the small tube body 201 and the large tube body 101 respectively to obtain the final stiffening longitudinal beam structure,

[0052] S5. Connect and install the stiffening longitudinal beam structure and the cross beam 11 by bolting and welding to complete the entire construction operation.

[0053] In this embodiment, the unmentioned parts in the construction method of the stiffened longitudinal beam structure are all carried out in accordance with the prior art to ensure that the stiffened longitudinal beam structure is finally obtained.

[0054] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various modifications can be made within the knowledge of ordinary technicians in the technical field without departing from the purpose of the present invention. These are all non-creative modifications and are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A stiffened longitudinal beam structure for enhancing the robustness of a mid-through arch suspension bridge system, characterized in that: It comprises a large pipe unit (1) and a small pipe unit (2) which are sleeved together, and two anchoring steel plate units (3) which are respectively arranged on the outer sides of the large pipe unit (1) and the small pipe unit (2) and are used to connect the crossbeam (11). The large tube unit (1) comprises a large tube body (101), and a baffle (102) arranged at one end of the large tube body (101) and used to fit the small tube unit (2); the small tube unit (2) comprises a small tube body (201) with one end inserted into the large tube body (101) and the outer annular surface of which fits the baffle (102), and an anti-falling steel plate (202) arranged on the insertion end of the small tube body (201) and fits the inner annular surface of the large tube body (101). The large tube unit (1) further comprises an outer annular stiffening plate (103) arranged on the outer side of the baffle (102) and on the outer annular surface of the large tube body (101), and an outer longitudinal stiffening plate (104) arranged between a plurality of the outer annular stiffening plates (103); the small tube unit (2) further comprises an inner annular stiffening plate (203) arranged on the inner annular surface of the small tube body (201), and an inner longitudinal stiffening plate (204) arranged between a plurality of the inner annular stiffening plates (203) and between the inner annular stiffening plate (203) and the anti-falling steel plate (202). A support pipe unit (5) is further provided between the large pipe body (101) and the small pipe body (201); the support pipe unit (5) is also located between the baffle plate (102) and the anti-falling steel plate (202). The support tube unit (5) comprises an elastic ring (501) sleeved between the large tube body (101) and the small tube body (201), two support tube bodies (502) respectively arranged on both sides of the elastic ring (501), and a compression spring (503) arranged on the relatively outer sides of the two support tube bodies (502) and used to lift the support tube body (502) on the baffle (102) and to lift the support tube body (502) on the anti-dropping steel plate (202).

2. A stiffened longitudinal beam structure for enhancing the robustness of a mid-through arch suspension bridge system according to claim 1, characterized in that: The inner annular surface of the large tube body (101) and the outer annular surface of the small tube body (201) are provided with a coating (4) for friction during plugging.

3. The stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge system of a mid-through arch bridge according to claim 1 is characterized in that: The thickness of the support tube body (502) is 90-95% of the distance between the inner annular surface of the large tube body (101) and the outer annular surface of the small tube body (201), and the length of the support tube body (502) is 35-48% of the length of the large tube body (101) and the small tube body (201) when plugged in.

4. The stiffened longitudinal beam structure for enhancing the robustness of the suspension bridge system of a mid-through arch bridge according to claim 1 is characterized in that: The insertion length of the large tube body (101) and the small tube body (201) is greater than twice the outer diameter of the large tube body (101).

5. The stiffened longitudinal beam structure for enhancing the robustness of the half-through arch suspension bridge system according to claim 1 is characterized in that: The anchoring steel plate unit (3) comprises an anchoring steel plate body (301) arranged on the relatively remote end of the large tube body (101) or the small tube body (201), a stiffening steel plate (302) arranged on the anchoring steel plate body (301) and used to connect the outer annular surface of the large tube body (101) or the small tube body (201), and a screw hole (303) arranged on the anchoring steel plate body (301) and used to insert a crossbeam threaded steel bar or a crossbeam screw rod.

6. A construction method for a stiffened longitudinal beam structure for enhancing the robustness of a mid-through arch suspension bridge system as claimed in claim 2, characterized in that The following steps are included in sequence: S1, welding the small tube body (201), the anti-falling steel plate (202), the inner annular stiffening plate (203) and the inner longitudinal stiffening plate (204) into a whole, and coating the coating (4) on the outer annular surface of the small tube body (201), to obtain the small tube unit (2); S2, first coating the coating (4) on the inner annular surface of the large tube body (101), and then sequentially inserting the small tube unit (2) and the supporting tube unit (5) to obtain a stiffened longitudinal beam structure matrix; S3, welding the baffle plate (102), the outer annular stiffening plate (103) and the outer longitudinal stiffening plate (104) onto the large tube body (101) to obtain a stiffened longitudinal beam structure body; S4, welding the anchoring steel plate unit (3) at both ends of the small tube body (201) and the large tube body (101) to obtain the final stiffening longitudinal beam structure, S5, connecting and installing the stiffening longitudinal beam structure and the cross beam (11) by bolting and welding, and completing the entire construction operation.

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