A suspension bridge system of a through-type arch bridge reinforced with a trussed steel structure and a stiffened longitudinal beam and its construction method

Abstract

The present invention belongs to the technical field of bridge engineering, and more particularly to a bottom-supported arch bridge suspension bridge system reinforced by a trussed steel structure stiffening longitudinal beam and a construction method thereof. The present invention achieves the effect of effective use of the bottom-supported arch bridge suspension bridge system by arranging corbels, supports, hangers, bridge decks, trussed steel structure stiffening longitudinal beams and concrete cross beams on the arch seats. The present invention has the advantages of high overall rigidity and good stability of the overall bottom-supported support structure including the trussed steel structure stiffening longitudinal beams and the concrete cross beams, light deadweight of the trussed steel structure stiffening longitudinal beams, high bending rigidity, and easy construction, and the overall bottom-supported support structure has a small deformation amount that is not conducive to the stress of the structure due to temperature changes, and has a good overall reinforcement effect on the entire suspension bridge system, and has great application value and good economic benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering, and in particular relates to a bottom-supported arch bridge suspension bridge system reinforced by a trussed steel structure stiffening longitudinal beam and a construction method thereof. Background Art

[0002] my country has built a large number of bottom-supported arch bridges. In the early days, the suspension bridge system design was not based on the stress of the reinforced longitudinal beams, but on the cross beams. The hangers were also anchored at both ends of the cross beams, and then the bridge deck was laid on the cross beams. Most of the cross beams did not have reinforced longitudinal beams. At present, after several years of operation, many bottom-supported arch bridges have many problems in their suspension bridge systems, such as excessive vibration of the bridge deck, serious damage to the bridge deck, and bearing detachment. In recent years, there have been many serious accidents in which the bridge deck collapsed due to accidental breakage of the hangers, and even the collapse of the entire bridge, causing irreparable economic losses.

[0003] With the occurrence of many major accidents caused by damage to the suspension bridge system of the bottom-supported arch bridge and the emergence of various types of diseases, researchers and designers have gradually paid attention to the setting of stiffened longitudinal beams. However, in the face of the reinforcement of the suspension bridge system of the bottom-supported arch bridge that has been in operation for many years, some choose to add concrete stiffened longitudinal beams, which have high rigidity and good vibration resistance, but are heavy, significantly increase the load on the hanger, and are difficult to construct. Some also choose to add steel structure steel beams as stiffened longitudinal beams, but the integral steel structure stiffened longitudinal beams and the concrete structure bridge system are made of different materials, and the deformation is inconsistent under the influence of temperature, resulting in new disease problems such as beam displacement, concrete cracking, and support shedding.

[0004] Therefore, it is necessary to design a bottom-supported arch bridge suspension bridge system reinforced with trussed steel structure stiffening longitudinal beams and its construction method, which has light weight, high rigidity, reasonable structural force, convenient construction and excellent durability. It can effectively solve the problems of insufficient overall rigidity and poor stability of the bottom-supported arch bridge suspension bridge system, and can fully release the deformation of the trussed steel structure stiffening longitudinal beams caused by temperature changes that is not conducive to structural force.

[0005] A Chinese utility model patent with patent announcement number CN211571359U and announcement date 2020.09.25 discloses a bottom-supported arch bridge that increases the lateral stiffness of the main beam and reduces the horizontal thrust of the foundation, including arch ribs, arch seats, main beams, and slings connecting the arch ribs and the main beams. Horizontal cables are tensioned on both sides of the main beam along the longitudinal direction of the bridge, and support rods are arranged between the main beam and the horizontal cables. The horizontal cables are connected to the main beam through the support rods to form lateral limit connections at several nodes.

[0006] However, the bottom-supported arch bridge in this utility model patent has the problems of insufficient bending rigidity and great difficulty in overall construction. Summary of the invention

[0007] The purpose of the present invention is to provide a bottom-supported arch bridge suspension bridge system reinforced by a trussed steel structure stiffening longitudinal beam and a construction method thereof, which can achieve the effect of effective use of the bottom-supported arch bridge suspension bridge system by arranging corbels, supports, hangers, bridge decks, trussed steel structure stiffening longitudinal beams and concrete cross beams on the arch seats. The present invention has the advantages of high overall rigidity and good stability of the overall bottom-supported support structure including the trussed steel structure stiffening longitudinal beams and the concrete cross beams, light deadweight of the trussed steel structure stiffening longitudinal beams, high bending rigidity, and easy construction, and the overall bottom-supported support structure has a small deformation amount that is not conducive to structural stress due to temperature changes, and has a good overall reinforcement effect on the entire suspension bridge system, and has great application value and good economic benefits.

[0008] The technical solution adopted by the present invention to solve the above-mentioned problems is: a bottom-supported arch bridge suspension bridge system reinforced with trussed steel structure stiffening longitudinal beams, including an arch seat, a corbel arranged on the arch seat, a support arranged on the corbel, a hanger, and a bridge deck, and also includes a trussed steel structure stiffening longitudinal beam arranged on the support, and a concrete crossbeam arranged between adjacent trussed steel structure stiffening longitudinal beams and with the hangers installed at both ends and used to support the bridge deck.

[0009] A further preferred technical solution is that the trussed steel structure stiffening longitudinal beam includes four longitudinal main pipes, a horizontal branch pipe arranged between two of the longitudinal main pipes at the same horizontal height, a vertical branch pipe and an inclined branch pipe arranged between two of the longitudinal main pipes on the same side, and an outer anchoring steel plate arranged at the ends of the four longitudinal main pipes and used to connect the concrete cross beam.

[0010] A further preferred technical solution is that the trussed steel structure stiffening longitudinal beam further comprises a stiffening steel plate which is arranged on the side of the outer anchoring steel plate away from the concrete cross beam and is used to connect the longitudinal main pipe.

[0011] A further preferred technical solution is that the trussed steel structure stiffening longitudinal beam further includes mounting holes arranged on the outer anchoring steel plate.

[0012] A further preferred technical solution is that the mounting holes include implanting screw holes arranged between the upper and lower groups of the longitudinal main pipes, and two groups of precision-rolled threaded steel bar holes respectively arranged outside the upper and lower groups of the longitudinal main pipes.

[0013] A further preferred technical solution is that the concrete beam includes a concrete beam body with the hangers respectively arranged at both ends of the upper surface, the outer anchoring steel plates respectively installed on two vertical side surfaces, the fine-rolled threaded steel bars arranged on the concrete beam body and passing through the fine-rolled threaded steel bar holes, and the implanted screws arranged on the concrete beam body and passing through the implanted screw holes.

[0014] A further preferred technical solution is that: the precision-rolled threaded steel bar has protruding ends on both sides of the concrete beam body, and one end of the implantable screw is arranged on the outside of the concrete beam body.

[0015] A further preferred technical solution is that the trussed steel structure stiffening longitudinal beam also includes a steel plate opening arranged on the outer anchoring steel plate and used to pass the longitudinal main pipe, and the concrete beam also includes a main body groove respectively arranged on the two vertical side surfaces of the concrete beam body and used to insert the protruding end of the longitudinal main pipe.

[0016] A further preferred technical solution is that the reinforcing steel plates are provided on both sides of the outer anchoring steel plate, and the concrete beam also includes a main body groove which is respectively arranged on the two vertical sides of the concrete beam body and is used to insert the reinforcing steel plates and connect the main body groove.

[0017] A construction method for a suspended bridge system of a through-type arch bridge reinforced with a trussed steel structure and a stiffened longitudinal beam comprises the following steps in sequence:

[0018] S1, welding the longitudinal main pipe, horizontal branch pipe, vertical branch pipe, inclined branch pipe, outer anchoring steel plate and stiffening steel plate to obtain the stiffened longitudinal beam of the truss steel structure;

[0019] S2, pre-embed the finely rolled threaded steel bars and the implanted screws on the concrete beam body, and open the main body slots and main body channels on the side of the concrete beam body to obtain the concrete beam, and separate and fix them;

[0020] S3, opening a hole inside the arch seat, implanting an anchor rod, and installing the corbel;

[0021] S4, fixing the trussed steel structure stiffening longitudinal beams on both sides of the concrete beam respectively, and completing the installation of the trussed steel structure stiffening longitudinal beams of the middle multi-sections;

[0022] S5, fixing the last two trussed steel structure stiffening longitudinal beams at both ends to the temporary supports on the corbels, and connecting them to the concrete cross beams to complete the overall structure of the bottom-supported arch bridge;

[0023] S6. The temporary support is replaced with the permanent support, and the construction of the entire bottom-supported arch bridge suspension bridge system reinforced with trussed steel structure and stiffened longitudinal beams is completed.

[0024] The present invention achieves the effect of effective use of the under-supported arch bridge suspension bridge system by arranging corbels, supports, hangers, bridge decks, truss steel structure stiffening longitudinal beams and concrete cross beams on the arch seat. The present invention has the advantages of high overall rigidity and good stability of the overall under-supported support structure including the truss steel structure stiffening longitudinal beams and the concrete cross beams, light deadweight, high bending rigidity and easy construction of the truss steel structure stiffening longitudinal beams, small deformation of the overall under-supported support structure due to temperature changes that is not conducive to structural stress, and good overall reinforcement effect on the entire suspension bridge system, and has great application value and good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the arch bridge suspension bridge system in the present invention.

[0026] Figure 2 It is a schematic diagram of the position structure of the arch seat in the present invention.

[0027] Figure 3 It is a schematic diagram of the connection structure between the trussed steel structure stiffening longitudinal beam and the concrete cross beam in the present invention.

[0028] Figure 4 It is a schematic diagram of a vertical section of a stiffening longitudinal beam of a trussed steel structure in the present invention.

[0029] Figure 5 It is a schematic diagram of the position structure of the main body slot in the present invention.

[0030] Figure 6 It is a front structural schematic diagram of the main body slot and the main body channel in the present invention. DETAILED DESCRIPTION

[0031] The following descriptions are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention.

[0032] Example: As attached Figure 1 , 2 , 3, 4, 5 and attached Figure 6 As shown, a bottom-supported arch bridge suspension bridge system reinforced with trussed steel structure stiffening longitudinal beams includes an arch seat 11, a corbel 12 arranged on the arch seat 11, a support 13 arranged on the corbel 12, a hanger 14, and a bridge deck 15, and also includes a trussed steel structure stiffening longitudinal beam 1 arranged on the support 13, and a concrete crossbeam 2 arranged between adjacent trussed steel structure stiffening longitudinal beams 1 and with the hangers 14 installed at both ends and used to support the bridge deck 15.

[0033] In this embodiment, a concrete cross beam 2 is provided between a plurality of the trussed steel structure stiffening longitudinal beams 1, and the concrete cross beam 2 directly supports the bridge deck 15. The two trussed steel structure stiffening longitudinal beams 1 on the outermost sides are supported on the supports 13, completing the bottom-supported support reinforcement structure of the entire arch bridge suspension bridge system.

[0034] In addition, the support 13 is arranged on the corbel 12 to support the load of the entire bottom-bearing support reinforcement structure and release the deformation of the bottom-bearing support reinforcement structure caused by temperature changes.

[0035] The trussed steel structure stiffening longitudinal beam 1 includes four longitudinal main pipes 101, a horizontal branch pipe 102 arranged between two of the longitudinal main pipes 101 at the same horizontal height, a vertical branch pipe 103 and an inclined branch pipe 104 arranged between two of the longitudinal main pipes 101 on the same side, and an outer anchoring steel plate 105 arranged at the ends of the four longitudinal main pipes 101 and used to connect the concrete beam 2.

[0036] In this embodiment, the longitudinal main pipe 101, the horizontal branch pipe 102, the vertical branch pipe 103 and the inclined branch pipe 104 can all be steel plates or steel sections of different sizes, and the contact points are firmly welded. The vertical branch pipe 103 and the inclined branch pipe 104 are spaced apart, and the shape of the outer anchoring steel plate 105 can be rectangular, circular, triangular, diamond, s-shaped or mesh-shaped.

[0037] The trussed steel structure stiffening longitudinal beam 1 further includes a stiffening steel plate 106 which is arranged on the side of the outer anchoring steel plate 105 away from the concrete cross beam 2 and is used to connect the longitudinal main pipe 101 .

[0038] In this embodiment, the reinforcing steel plate 106 is perpendicular to the outer anchoring steel plate 105 , and it is ensured that each of the longitudinal main pipes 101 has at least four welding reinforcement positions of the reinforcing steel plate 106 .

[0039] The truss steel structure stiffening longitudinal beam 1 also includes mounting holes arranged on the outer anchoring steel plate 105. The mounting holes include a screw hole 107 arranged between the upper and lower groups of longitudinal main pipes 101, and two groups of finished rolled threaded steel bar holes 108 respectively arranged outside the upper and lower groups of longitudinal main pipes 101.

[0040] In this embodiment, the implanted screw holes 107 and the finished rolled threaded steel bar holes 108 are fixed installation positions between the trussed steel structure stiffening longitudinal beam 1 and the concrete cross beam 2, ensuring that the entire bottom-bearing support reinforcement structure has good integrity and high structural strength.

[0041] The concrete beam 2 includes the hangers 14 respectively arranged at both ends of the upper surface, a concrete beam body 201 with the outer anchoring steel plates 105 respectively installed on two vertical side surfaces, a fine-rolled threaded steel bar 202 arranged on the concrete beam body 201 and passing through the fine-rolled threaded steel bar hole 108, and an implanted screw 203 arranged on the concrete beam body 201 and passing through the implanted screw hole 107.

[0042] In this embodiment, the fine-rolled threaded steel bar 202 can be fixed on the concrete beam body 201, or a hole can be pre-opened on the concrete beam body 201, and the fine-rolled threaded steel bar 202 can be inserted into the hole.

[0043] The fine-rolled threaded steel bars 202 on the upper and lower sides, together with the implanted screw 203 in the middle, can ensure that the external anchoring steel plate 105 on the concrete beam body 201 has sufficient installation stability.

[0044] The finely rolled threaded steel bar 202 has protruding ends on both sides of the concrete beam body 201, and one end of the implantable screw 203 is arranged outside the concrete beam body 201. The trussed steel structure stiffening longitudinal beam 1 also includes a steel plate opening 109 arranged on the outer anchoring steel plate 105 and used to pass through the longitudinal main pipe 101, and the concrete beam 2 also includes a main body slot 204 respectively arranged on the two vertical side surfaces of the concrete beam body 201 and used to insert the protruding ends of the longitudinal main pipe 101. The stiffening steel plates 106 are arranged on both sides of the outer anchoring steel plate 105, and the concrete beam 2 also includes a main body channel 205 respectively arranged on the two vertical side surfaces of the concrete beam body 201 and used to insert the stiffening steel plates 106 and connected to the main body slot 204.

[0045] In this embodiment, the protruding end of the longitudinal main pipe 101 on the other side of the outer anchoring steel plate 105 is plugged into the main body groove 204, so that there is a direct installation structure between the longitudinal main pipe 101 and the concrete beam main body 201, further ensuring the installation strength of the trussed steel structure stiffening longitudinal beam 1 on the concrete beam main body 201.

[0046] In addition, the reinforcing steel plates 106 are divided into two groups, which are respectively arranged on the two sides of the outer anchoring steel plates 105, so that the group of reinforcing steel plates 106 close to the concrete beam body 201 can be inserted into the main body groove 205. The purpose is also to assist in reinforcing the longitudinal main pipe 101 and the concrete beam body 201, ensuring that the entire lower-supported support reinforcement structure has high stability and has a pre-aligned plug-in relationship, which is convenient for subsequent overall construction operations.

[0047] A construction method for a suspended bridge system of a through-type arch bridge reinforced with a trussed steel structure and a stiffened longitudinal beam comprises the following steps in sequence:

[0048] S1, welding the longitudinal main pipe 101, the horizontal branch pipe 102, the vertical branch pipe 103, the inclined branch pipe 104, the outer anchoring steel plate 105 and the stiffening steel plate 106 to obtain the trussed steel structure stiffening longitudinal beam 1;

[0049] S2, pre-embed the finely rolled threaded steel bars 202 and the implanted screws 203 on the concrete beam body 201, and open the main body slots 204 and the main body channels 205 on the side of the concrete beam body 201 to obtain the concrete beam 2, and separate and fix them;

[0050] S3, opening a hole inside the arch seat 11, implanting an anchor rod, and installing the corbel 12;

[0051] S4, respectively fixing the trussed steel structure stiffening longitudinal beam 1 on both sides of the concrete cross beam 2 to complete the installation of the middle multi-segment trussed steel structure stiffening longitudinal beam 1;

[0052] S5, fixing the last two trussed steel structure stiffening longitudinal beams 1 at both ends to the temporary supports on the corbels 12, and connecting them to the concrete cross beams 2 to complete the overall structure of the bottom-supported arch bridge;

[0053] S6. The temporary support is replaced with the permanent support 13, and the construction of the entire bottom-supported arch bridge suspension bridge system reinforced with trussed steel structure and stiffened longitudinal beams is completed.

[0054] In this embodiment, the parts not mentioned in the construction method are all carried out in accordance with the prior art to ensure that the above-mentioned bottom-supported arch bridge suspension bridge system is constructed. The bottom-supported arch bridge suspension bridge system has the advantages of simple construction, high efficiency, and high application value.

[0055] 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 bottom-supported arch bridge suspension bridge system reinforced with a trussed steel structure reinforced longitudinal beam, comprising an arch seat (11), a bracket (12) arranged on the arch seat (11), a support (13) arranged on the bracket (12), a hanger (14), and a bridge deck (15), characterized in that: It also includes a trussed steel structure stiffening longitudinal beam (1) arranged on the support (13), and a concrete cross beam (2) arranged between adjacent trussed steel structure stiffening longitudinal beams (1) and having the hangers (14) installed at both ends and used to support the bridge deck (15). The trussed steel structure stiffening longitudinal beam (1) comprises four longitudinal main pipes (101), a horizontal branch pipe (102) arranged between two longitudinal main pipes (101) at the same level, a vertical branch pipe (103) and an inclined branch pipe (104) arranged between two longitudinal main pipes (101) on the same side, and an outer anchoring steel plate (105) arranged at the ends of the four longitudinal main pipes (101) and used for connecting the concrete cross beam (2). The trussed steel structure stiffening longitudinal beam (1) further comprises a stiffening steel plate (106) arranged on the side of the outer anchoring steel plate (105) away from the concrete cross beam (2) and used for connecting the longitudinal main pipe (101). The trussed steel structure stiffening longitudinal beam (1) further comprises a mounting hole arranged on the outer anchoring steel plate (105), The mounting holes include an implant screw hole (107) arranged between the upper and lower groups of the longitudinal main pipes (101), and two groups of precision-rolled threaded steel bar holes (108) respectively arranged outside the upper and lower groups of the longitudinal main pipes (101). The concrete cross beam (2) comprises a concrete cross beam body (201) with the hangers (14) respectively arranged at both ends of the upper surface, the outer anchoring steel plates (105) respectively installed on two vertical side surfaces, a finely rolled threaded steel bar (202) arranged on the concrete cross beam body (201) and passing through the finely rolled threaded steel bar hole (108), and an implantable screw (203) arranged on the concrete cross beam body (201) and passing through the implantable screw hole (107). The finely rolled threaded steel bar (202) has protruding ends on both sides of the concrete beam body (201), and one end of the implantable screw rod (203) is arranged outside the concrete beam body (201). The trussed steel structure stiffening longitudinal beam (1) further comprises a steel plate opening (109) arranged on the outer anchoring steel plate (105) and used for passing the longitudinal main pipe (101), and the concrete cross beam (2) further comprises a main body slot (204) respectively arranged on two vertical side surfaces of the concrete cross beam main body (201) and used for inserting the protruding end of the longitudinal main pipe (101).

2. The through-type arch suspension bridge system reinforced with trussed steel structure stiffening longitudinal beams according to claim 1, characterized in that: The reinforcing steel plates (106) are provided on both sides of the outer anchoring steel plate (105), and the concrete cross beam (2) further comprises a main body groove (205) which is respectively provided on two vertical sides of the concrete cross beam main body (201) and is used for inserting the reinforcing steel plates (106) and is connected to the main body groove (204).

3. A construction method for a through-type arch suspension bridge system reinforced with a trussed steel structure and reinforced longitudinal beams as claimed in claim 2, characterized in that The following steps are included in sequence: S1, welding the longitudinal main pipe (101), the horizontal branch pipe (102), the vertical branch pipe (103), the inclined branch pipe (104), the outer anchoring steel plate (105) and the stiffening steel plate (106) to obtain the trussed steel structure stiffening longitudinal beam (1); S2, pre-embedding finely rolled threaded steel bars (202) and implanted screws (203) on the concrete crossbeam body (201), and providing a main body slot (204) and a main body channel (205) on the side of the concrete crossbeam body (201) to obtain the concrete crossbeam (2), and then separating and fixing them; S3, opening a hole inside the arch seat (11), implanting an anchor rod, and installing the corbel (12); S4, respectively fixing the trussed steel structure stiffening longitudinal beam (1) on both sides of the concrete cross beam (2), completing the installation of the middle multi-segment trussed steel structure stiffening longitudinal beam (1); S5, fixing the last two trussed steel structure stiffening longitudinal beams (1) at both ends to temporary supports on the corbels (12), and connecting them to the concrete cross beams (2), thereby completing the overall structure of the bottom-supported arch bridge; S6. The temporary support is replaced with the permanent support (13), and the construction of the entire bottom-supported arch bridge suspension bridge system reinforced with a trussed steel structure and stiffened longitudinal beams is completed.

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