Cable-arch composite structure system bridge and construction method thereof

Abstract

The invention relates to the technical field of bridge engineering, in particular to a cable-arch combined structure system bridge and a construction method thereof.The cable-arch combined structure system bridge comprises a plurality of lower structures and main beams installed on the lower structures; an arch rib is arranged on the main beam, a plurality of suspenders are arranged between the arch rib and the main beam, and the suspenders are distributed at intervals in the length direction of the main beam; wherein a cable rotating saddle is arranged at the top of the arch rib, a plurality of stay cables located on the two sides of the arch rib are further arranged on the main beam, one end of each stay cable is arranged on the cable rotating saddle, the other end of each stay cable is arranged on the main beam, and the stay cables are arranged on the main beam at intervals. The problem that an existing arch cable combined structure system is unclear in stress is solved, the structure has definite stress distribution, the arch ribs serve as main stress, the advantages of an arch bridge and a cable-stayed bridge can be better utilized, and the advantages are enhanced to avoid the disadvantages.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and more specifically, to a cable-arch combined structural system bridge and a construction method thereof. Background Art

[0002] With the advancement of transportation infrastructure projects, bridges, as buildings built to cross mountain streams, poor geology or meet other transportation needs to make travel more convenient, have seen continuous progress in design concepts, gradual development in calculation methods and increasingly mature construction techniques.

[0003] An arch bridge is a bridge that uses an arch as the main load-bearing structural component in a vertical plane. This type of bridge design is not only beautiful, but also very practical in engineering.

[0004] However, on the one hand, traditional arch bridges have limitations in structural design. A notable feature of non-tied arch bridges, such as common concrete arch bridges or steel arch bridges, is that they generate horizontal thrust at the arch foot. This thrust leads to problems such as high construction requirements, high costs, and high complexity, which limits the promotion of arch bridges.

[0005] On the other hand, traditional arch bridges have limitations in construction methods. Conventional tied arch bridge construction usually adopts the method of "beam first, arch later". This construction process is complicated and requires the construction of the arched bridge deck after the beam construction is completed, which requires a high level of technical and management capabilities. In addition, during the beam construction process, temporary facilities may need to be built or ground excavation may be carried out, causing damage or impact on the surrounding environment and landscape.

[0006] Therefore, it is necessary to improve the bridge structure of the arch bridge. Summary of the invention

[0007] The main purpose of the present invention is to propose a cable-arch composite structure system bridge and a construction method thereof. By adopting the scheme of "arch first and beam later", not only the engineering cost is low, but also the maintenance workload during the operation period is reduced.

[0008] In order to solve the above technical problems, the present invention proposes a cable-arch composite structure system bridge, comprising: a plurality of substructures and main beams installed on the substructures; arch ribs are arranged on the main beams, and hangers are arranged between the arch ribs and the main beams, and there are multiple hangers, which are spaced apart along the length direction of the main beams;

[0009] Among them, a cable saddle is arranged on the top of the arch rib, and a plurality of inclined cables are arranged on both sides of the arch rib on the main beam. One end of the inclined cable is arranged on the cable saddle, and the other end is arranged on the main beam, and the inclined cables are arranged at intervals on the main beam.

[0010] In the above technical solution, further, the lower structure includes: a pile foundation, a cap disposed on the pile foundation, and a bridge pier disposed on the cap;

[0011] Among them, the main beam is located on the pier.

[0012] In any of the above technical solutions, further, the main beam is divided into side span beam sections on both sides and a middle span beam section in the middle;

[0013] Among them, the middle span beam section is divided into beam section No. 1, beam section No. 2, beam section No. n-1 and beam section No. n from both sides to the middle;

[0014] Each beam section on the mid-span beam section is connected with a hanger rod.

[0015] On the other hand, a construction method of a cable-arch composite structure bridge is also provided, and the specific steps of the construction method are as follows:

[0016] Step 1: construct the substructure;

[0017] Step 2: Set up steel pipe supports or buckle supports at the pedestal positions of the side span and the middle span, install the embedded steel pipes of the arch foot of the arch rib, and cast the side span beam section of the main beam and the arch foot section of the arch rib;

[0018] Step 3: Set a cable saddle on the top of the arch rib, and hoist the arch rib on the side span beam section of the main beam and connect it to the arch foot section of the arch rib. Then install the inclined cable and tension it for the first time, so that the tensioning force of the inclined cable is equal to the thrust of the arch rib.

[0019] Step 4: symmetrically hoist beam section No. 1 and the hangers thereon, tension the hangers on beam section No. 1, and tension the stay cables for a second time;

[0020] Step 5: Install beam section No. 2 and the hanger thereon, ... beam section No. n-1 and the hanger thereon in sequence according to step 4, and tension the stay cables;

[0021] Step 6: Install the No. n beam segment and the hangers thereon, tension the stay cables, adjust the cable tension of the entire bridge, and remove the erected supports;

[0022] Step 7: Install the bridge deck and guardrails on the main beam, then measure the cable tension of the entire bridge, and then fine-tune some of the hangers and cable tensions.

[0023] Beneficial effects: Compared with the prior art, 1. The present invention adopts an arch-cable combined system structure. Compared with the current single combined system, it has the advantages of both arch bridges and cable-stayed bridges. By setting the inclined cables, the beam height is reduced and the bridge span is increased. It can be well applied in various construction scenarios such as those with requirements for clearance and medium and large spans.

[0024] 2. The present invention is a new type of arch-cable combined system structure, which solves the problem of unclear force in the current arch-cable combined structure system. The structure has a clear force distribution, and the arch rib is the main force bearer, which can better utilize the advantages of arch bridges and cable-stayed bridges and maximize their strengths and avoid their weaknesses.

[0025] 3. Part of the horizontal thrust generated by the arch structure under load is offset by the cable-stayed system, which reduces the overall axial force of the main beam and the amount of material consumed by the tie beam, thereby reducing the overall construction workload and difficulty.

[0026] 4. The bridge structure of the present invention is novel, with distinct structural layers, high recognition and good landscape effect.

[0027] 5. The bridge construction of the present invention adopts the "arch first, beam later" scheme, which is novel and more convenient to construct and more economical than the traditional "beam first, arch later" scheme. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of the construction structure of step 1 of the construction method of the present invention;

[0030] Figure 2 It is a schematic diagram of the construction structure of step 2 of the construction method of the present invention;

[0031] Figure 3 It is a schematic diagram of the construction structure of step 3 of the construction method of the present invention;

[0032] Figure 4 It is a schematic diagram of the construction structure of step 4-step 5 of the construction method of the present invention;

[0033] Figure 5 It is a schematic diagram of the construction structure after the bridge of the present invention is installed.

[0034] The following are the descriptions of the reference numerals:

[0035] 1. Substructure; 11. Pile foundation; 12. Abutment; 13. Pier; 2. Main beam; 21. Side span beam section; 221. Beam section No. 1; 222. Beam section No. 2; 223. Beam section No. n; 3. Arch rib; 31. Arch foot section; 4. Hanger; 5. Cable saddle; 6. Stay cable. DETAILED DESCRIPTION

[0036] Below, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that, as shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not specifically refer to the singular, but may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list, and the method or device may also include other steps or elements.

[0038] If the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] The present invention provides a cable-arch combined structure system bridge and a construction method thereof, and innovatively designs the bridge structure design and construction method. Structurally, the system not only effectively balances the thrust of the arch bridge by setting up inclined cables, thus expanding its scope of popularization and application; it also has a beautiful appearance, which meets the needs of contemporary urban construction and bridge landscape requirements. In terms of construction, the system adopts the scheme of "arch first and beam later", with a slightly lower engineering cost and less maintenance workload during the operation period.

[0042] A cable-arch composite structure system bridge and a construction method thereof of the present application are described in detail through the following embodiments.

[0043] Embodiment 1:

[0044] like Figure 5 As shown, in this embodiment, a cable-arch composite structure system bridge comprises: a plurality of substructures 1 and main beams 2 installed on each substructure 1, arch ribs 3 are arranged on the main beams 2, and hangers 4 are arranged between the arch ribs 3 and the main beams 2, the upper end of the hanger 4 is anchored on the lower web of the arch rib 3, and the lower end is connected to the main beam 2, and there are a plurality of hangers 4, which are spaced apart and distributed along the length direction of the main beam 2;

[0045] Among them, a turning cable saddle 5 is arranged on the top of the arch rib 3, and a plurality of inclined cables 6 are arranged on both sides of the arch rib 3 on the main beam 2. One end of the inclined cable 6 is arranged on the turning cable saddle 5, and the other end is arranged on the main beam 2, and the inclined cables 6 are arranged at intervals on the main beam 2.

[0046] In order to solve the problem of horizontal thrust generated at the arch foot of the arch rib 3, a cable saddle 5 is installed on the arch rib 3, and then a cable 6 is installed on the cable saddle 5 and the main beam 2. The cable 6 is used to balance the thrust of the arch rib 3 on the main beam 2, thereby reducing the overall axial force of the main beam 2 and the material consumption of the tie beam, thereby reducing the overall construction volume and construction difficulty.

[0047] In this embodiment, it should be noted that the lower structure 1 includes: a pile foundation 11 , a cap 12 disposed on the pile foundation 11 , and a pier 13 disposed on the cap 12 ; wherein the main beam 2 is located on the pier 13 .

[0048] In this embodiment, it should be noted that the main beam 2 is divided into side span beam sections 21 on both sides and a middle span beam section in the middle;

[0049] Among them, the middle span beam section is divided into beam section No. 1, beam section No. 2, beam section No. n-1 and beam section No. n from both sides to the middle;

[0050] Each beam section on the mid-span beam section is connected with a hanger 4.

[0051] By dividing the main beam 2 into sections, a construction plan of "arch first and beam later" is implemented, which effectively improves the construction efficiency and reduces the construction difficulty.

[0052] Embodiment 2:

[0053] like Figure 1-Figure 5 As shown, this embodiment provides a construction method for the cable-arch composite structure system bridge in Embodiment 1, and the specific steps of the construction method are as follows:

[0054] Step 1, construct the substructure 1;

[0055] Step 2: at the position of the cap 12 of the side span, a steel pipe support or a buckle support is set up, the pre-buried steel pipe of the arch foot of the arch rib 3 is installed, and the side span beam section 21 of the main beam 2 and the arch foot section 31 of the arch rib 3 are cast;

[0056] Step 3, a cable saddle 5 is arranged on the top of the arch rib 3, and the arch rib 3 is hoisted on the side span beam section 21 of the main beam 2, and connected to the arch foot section 31 of the arch rib 3, and then the inclined cable 6 is installed and tensioned for the first time, so that the tensioning cable force of the inclined cable 6 is equal to the thrust of the arch rib 3;

[0057] Step 4, symmetrically hoisting the beam section No. 1 221 and the hanger 4 thereon, tensioning the hanger 4 on the beam section No. 1, and at the same time, secondary tensioning the inclined cable 6;

[0058] Step 5, according to step 4, install the beam section 222 No. 2 and the hanger 4 thereon, ... the beam section 223 No. n-1 and the hanger 4 thereon in sequence, and tension the inclined cable 6;

[0059] Step 6: Install the beam section n 224 and the hanger 4 thereon, tension the stay cable 6, adjust the cable force of the whole bridge, and remove the erected brackets;

[0060] Step 7: Install the bridge deck and guardrails on the main beam 2, then measure the cable tension of the entire bridge, and then fine-tune the tension of some hangers 4 and stay cables 6 locally.

[0061] The traditional solution of "beam first, arch later" has the problem of great construction difficulty. Therefore, this embodiment adopts the method of "arch first, beam later" for construction, which not only effectively improves the construction efficiency but also greatly reduces the construction difficulty.

[0062] Specifically, the lower structure 1 is first constructed on the river channel. The lower structure 1 mainly consists of pile foundations 11, abutments 12 and bridge piers 13. The lower structure 1 is divided into a side span part and a middle span part. The side span part refers to the part on both sides of the river channel, and the middle span part refers to the middle part. After the lower structure 1 is fully constructed, a bracket is then built on the side span part. The bracket can be a steel pipe bracket or a buckle bracket. Then, the side span beam section 21 and the arch foot section 31 of the arch rib 3 are cast at the side span position. Then, the arch rib 3 and the turning cable saddle 5 on the arch rib 3 are installed. The arch rib 3 and the turning cable saddle 5 are first manufactured by the steel plant and then transported to the bridge location. Then, the two feet of the arch rib 3 are connected to the arch foot section 31 by floating hoisting. The arch rib 3 and the pre-embedded steel pipe of the arch foot section are welded into a whole. Then, the inclined cable 6 is installed and initially tensioned. The cable force of the inclined cable 6 needs to be equal to the thrust of the arch rib 3. Next, the middle span beam section is hoisted. The middle span beam section is a precast concrete beam section or a steel beam section. The beam sections on both sides are hoisted first, and then gradually moved together to the middle. During the hoisting of beam section No. 1, beam section No. 2, beam section n-1 and beam section No. n, it is necessary to tension the cable 6. After the hoisting is completed, the temporary support of the entire bridge can be removed; finally, the bridge deck and anti-collision guardrail and other structures are paved on the main beam 2. After the paving is completed, the cable tension of the entire bridge is measured, and the force of some hangers 4 and the cable tension of the cable 6 can be locally adjusted.

[0063] After the bridge is completed, the dead load of the main beam 2 and the live load acting on the main beam 2 are mainly borne by the arch rib 3, and the inclined cable 6 bears part of it, that is, part of the load is transmitted to the arch rib 3 through the hanger 4, generating a horizontal thrust at the arch foot, and the inclined cable 6 system generates a horizontal force to offset part of the axial pressure of the main beam 2 and improve the stability of the bridge. If the bridge deck is paved for the second time in the later stage, the cable tension of the whole bridge will be measured after the paving load is applied, and the force of some hangers 4 can be fine-tuned locally.

[0064] It should be noted that the lower structure mainly consists of four parts, which are the side span parts on both sides and the middle span part close to the arch rib. The side span beam section of the main beam refers to the part located between the side span part and the middle span part. Therefore, the bracket is built between the side span part and the middle span part of the lower structure, and then cast between the two to form the side span beam section. The middle span beam section of the main beam refers to the part located on the inner side of the arch rib, which is installed by hoisting.

[0065] This embodiment solves the problem of unclear force in the current arch-cable combined structure system. The structure has a clear force distribution, and the arch rib 3 is the main force bearer, which can better utilize the advantages of arch bridges and cable-stayed bridges and maximize their strengths and avoid their weaknesses.

[0066] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A cable-arch combined structural system bridge, characterized in that: include: A plurality of lower structures (1) and a main beam (2) mounted on each lower structure (1); an arch rib (3) is arranged on the main beam (2); a suspension rod (4) is arranged between the arch rib (3) and the main beam (2); a plurality of suspension rods (4) are provided and are spaced apart along the length direction of the main beam (2); A cable saddle (5) is provided at the top of the arch rib (3), and a plurality of inclined cables (6) located on both sides of the arch rib (3) are also provided on the main beam (2), one end of the inclined cable (6) is provided on the cable saddle (5), and the other end is provided on the main beam (2), and the inclined cables (6) are arranged at intervals on the main beam (2).

2. The cable-arch composite structure system bridge according to claim 1, characterized in that: The lower structure (1) comprises: a pile foundation (11), a capping platform (12) arranged on the pile foundation (11), and a bridge pier (13) arranged on the capping platform (12); Wherein, the main beam (2) is located on the pier (13).

3. The cable-arch composite structure system bridge according to claim 1, characterized in that: The main beam (2) is divided into side span beam sections (21) on both sides and a middle span beam section in the middle; The middle span beam section is divided into beam section No. 1 (221), beam section No. 2 (222), beam section No. n-1 (223) and beam section No. n (224) in sequence from both sides to the middle; Each beam section on the mid-span beam section is connected to the suspension rod (4).

4. A construction method for the cable-arch composite structure system bridge according to claim 3, characterized in that: The specific steps of the construction method are as follows: Step 1: construct the substructure (1); Step 2: at the positions of the caps (12) of the side span and the middle span, a support is set up, the pre-buried steel pipe of the arch foot of the arch rib (3) is installed, and the side span beam section (21) of the main beam (2) and the arch foot section (31) of the arch rib (3) are cast; Step 3, a cable saddle (5) is arranged on the top of the arch rib (3), and the arch rib (3) is hoisted on the side span beam section (21) of the main beam (2), and connected to the arch foot section (31) of the arch rib (3), and then the inclined cable (6) is installed and tensioned for the first time, so that the tensioning force of the inclined cable (6) is equal to the thrust of the arch rib (3); Step 4, symmetrically hoisting the beam section No. 1 (221) and the suspension rod (4) thereon, tensioning the suspension rod (4) on the beam section No. 1 (221), and simultaneously tensioning the inclined cable (6) for a second time; Step 5, according to step 4, sequentially install beam section No. 2 (222) and the hanger rod (4) thereon, ... beam section No. n-1 (223) and the hanger rod (4) thereon, and tension the inclined cable (6); Step 6: Install the beam section n (224) and the hanger (4) thereon, tension the stay cables (6), adjust the cable tension of the entire bridge, and remove the erected brackets; Step 7: The bridge deck and guardrails are laid on the main beam (2), and then the cable tension of the entire bridge is measured, and then the cable tension of some hangers (4) and inclined cables (6) is fine-tuned locally.

5. The construction method of the cable-arch composite structure system bridge according to claim 4, characterized in that: The middle span beam section is a precast concrete beam section or a steel beam section.

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