Steel structure beam type landscape bridge with slim pier columns

Abstract

The utility model provides a pier stud slim steel structure beam type landscape bridge, including steel girder, slim pier stud, pier stud foundation, bridge abutment and end support, the steel girder is the superstructure of bridge, the slim pier stud is the steel structure member and bears the tensile force, the upper end of pier stud foundation is connected with slim pier stud, and the end support is connected with the bridge abutment. The bridge abutment comprises an abutment body and a foundation of the abutment body, and the end supports are connecting supports between the two ends of the steel girder and the bridge abutment. Before the slim pier column is installed, a temporary ballasting load larger than the second-stage dead load and the use live load of the bridge is applied to the steel main beam after falling, and after installation of the slim pier column is completed, the temporary ballasting load is removed. The pier column bears tension all the time in the using process of a bridge, the problem that the pier column is pressed to be unstable does not exist, a high-strength steel structure component can be adopted, the pier column is thinned, the landscape effect of the bridge is improved, the utilization rate of the steel strength of the steel main beam can be remarkably improved, and waste of materials is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction engineering, and particularly relates to a steel structure beam type landscape bridge with slenderized piers. Background Technique

[0002] With the continuous development of social economy and the continuous improvement of the public aesthetic level, people's demand for bridge structures is not only limited to meeting traffic functions, but also the pursuit of the landscape of bridge architecture is getting higher and higher.

[0003] Due to the advantages of light beam body, fast construction, and strong adaptability to the surrounding environment, the steel structure beam bridge has become the preferred bridge type for urban landscape bridges. As the main load-bearing member of the beam bridge, the steel main beam is required to have sufficient strength and stiffness during bridge construction design. Due to the characteristics of light weight and high strength of the steel structure, the stiffness usually plays a controlling role in the design of the steel main beam, and its strength often has a large surplus, resulting in the underutilization of the strength of the steel and causing waste of materials. In addition, when the bridge length is relatively long, it is generally necessary to add piers to support the beam body to reduce the span and meet the stiffness requirements of the beam body. However, the existing beam-type piers are designed as compression members, and due to the need to meet both strength and stability requirements, their cross-sectional dimensions are often relatively thick, as shown in Figure 1 and Figure 2 shown, which affects the landscape effect of the beam bridge. Content of the Utility Model

[0004] In order to solve the above technical problems, the utility model provides a steel structure beam type landscape bridge with slenderized piers to solve the problems put forward in the above background technique.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A steel structure beam type landscape bridge with slenderized piers includes a steel main beam, slenderized piers, pier foundations, abutments, and end bearings. The steel main beam is the upper structure of the bridge. The slenderized piers are steel structure members and bear tension, and are arranged between two abutments. The upper end of the slenderized piers is connected to the bottom of the steel main beam. The upper end of the pier foundation is connected to the slenderized piers. The abutment includes a pier body and its foundation. The end bearing is a connecting bearing between the two ends of the steel main beam and the abutment. The two ends of the steel main beam are connected to the upper end of the pier body of the abutment through the end bearings.

[0007] Furthermore, the slenderized piers adopt column piers or V-shaped piers, and one or at least two are arranged in the transverse direction of the bridge.

[0008] Furthermore, the cross-sectional form of the steel main beam adopts a flat steel box girder.

[0009] Furthermore, the slenderized pier columns are rigidly or hingedly connected to the steel main girder and the pier foundation.

[0010] Furthermore, one or at least two slenderized pier columns are arranged in the longitudinal direction of the bridge.

[0011] The construction method of the steel structure beam type landscape bridge with slenderized pier columns of the present utility model is as follows:

[0012] Construction stage 1: Construct the pier foundation and the abutment, and install the end support on the top surface of the abutment body.

[0013] Construction stage 2: The factory processes and manufactures the steel main girder in segments according to the linear shape considering the camber, transports it to the site and erects it on the temporary piers, and then completes the connection between the steel main girder segments and the connection between the steel main girder and the end support.

[0014] Construction stage 3: Remove the temporary support, and then apply a temporary heavy load greater than the secondary permanent load and the live load of the bridge on the steel main girder, so that the steel main girder generates a downward vertical elastic deformation.

[0015] Construction stage 4: Install the slenderized pier columns and complete the connection between the slenderized pier columns, the steel main girder and the pier foundation.

[0016] Construction stage 5: Remove the temporary heavy load applied on the steel main girder. At this time, the slenderized pier columns generate a tensile force due to restricting the upward recovery of the elastic deformation of the steel main girder, and this tensile force is greater than the pressure generated by the slenderized pier columns under the action of the secondary permanent load and the live load of the bridge; then construct the bridge accessory facilities to complete the construction of the bridge.

[0017] The present utility model has the following beneficial effects compared with the prior art:

[0018] 1. In the steel structure beam type landscape bridge constructed by the present utility model, the pier columns bear tensile forces and there is no problem of buckling under compression. High-strength steel structure components can be used, realizing the slenderization of the pier columns and improving the landscape effect of the bridge.

[0019] 2. Under the live load of the landscape bridge of the present utility model, the slenderized pier columns can be used as the support of the steel main girder just like the traditional compression pier columns, reducing the span of the steel main girder and making the stiffness of the steel main girder meet the specification requirements.

[0020] 3. Before installing the slenderized pier columns of the landscape bridge of the present utility model, by applying a temporary heavy load greater than the secondary permanent load and the live load of the bridge on the steel main girder after the removal of the support, the utilization rate of the steel strength of the steel main girder can be significantly improved, avoiding the waste of materials. Brief Description of the Drawings

[0021] Figure 1Schematic diagram of the structural system of a steel - structure girder bridge in the prior art;

[0022] Figure 2 Schematic diagram of the cross - section at the pier column of a steel - structure girder bridge in the prior art;

[0023] Figure 3 Schematic diagram of the structural system of the steel - structure girder landscape bridge of the present utility model;

[0024] Figure 4 Schematic diagram of the cross - section at the column - type pier of the steel - structure girder landscape bridge of the present utility model;

[0025] Figure 5 Schematic diagram of the cross - section at the V - type pier of the steel - structure girder landscape bridge of the present utility model;

[0026] Figure 6 Schematic diagram of the construction process of the steel - structure girder landscape bridge of the present utility model.

[0027] In the figure, the markings are: 1. Steel main girder; 2. Slim - type pier column; 3. Pier column foundation; 4. Abutment; 5. End support. Detailed implementation manners

[0028] The following further describes the present utility model in detail in conjunction with the accompanying drawings and specific implementation manners:

[0029] A steel - structure girder landscape bridge with a slim - type pier column provided by the present utility model can achieve the slimming of the pier column, improve the bridge landscape effect, and can significantly improve the utilization rate of the steel strength of the steel main girder, reducing material waste.

[0030] The structural system of the steel - structure girder landscape bridge of the present utility model is as Figure 3 shown, including a steel main girder 1, a slim - type pier column 2, a pier column foundation 3, an abutment 4, and an end support 5. The steel main girder 1 is the upper structure of the bridge. The slim - type pier column 2 is a steel - structure member and bears tension, is arranged between two abutments, and is connected to the bottom of the steel main girder at the upper end. The upper end of the pier column foundation 3 is connected to the slim - type pier column. The abutment 4 includes a pier body and its foundation. The end support 5 is a connecting support between the two ends of the steel main girder and the abutment 4. The two ends of the steel main girder 1 are connected to the upper end of the pier body of the abutment 4 through the end support 5.

[0031] Furthermore, the slim - type pier column 2 can adopt a column - type pier, as Figure 4 shown, or can adopt a V - type pier, as Figure 5 shown. The V - type pier has a beautiful shape and can improve the lateral stiffness of the bridge. The slim - type pier column 2 is arranged 1 or at least 2 in the transverse direction of the bridge.

[0032] Furthermore, the steel main girder 1 preferably adopts a flat steel box girder section with good landscape effect and a large flexural moment of inertia.

[0033] Furthermore, the slenderized pier column 2 can be rigidly connected or hinged to the steel main girder 1 and the pier foundation 3.

[0034] Furthermore, according to the landscape effect of the bridge design, more than one slenderized pier column 2 can be arranged in the longitudinal direction of the bridge.

[0035] A construction method of a steel structure beam-type landscape bridge with slenderized pier columns of the present utility model is characterized in that the specific steps are as follows:

[0036] Construction stage 1: Construct the pier foundation 3 and the abutment 4, and install the end support 5 on the abutment 4;

[0037] Construction stage 2: The factory processes and manufactures the steel main girder 1 in segments according to the linear shape considering the camber, transports it to the site and erects it on the temporary piers, and then completes the connection between the steel main girder 1 segments and the connection between the steel main girder 1 and the end support 5;

[0038] Construction stage 3: Remove the temporary supports, and then apply a temporary dead load greater than the secondary permanent load and the live load of the bridge on the steel main girder 1, and the steel main girder 1 generates a downward vertical elastic deformation;

[0039] Construction stage 4: Install the slenderized pier column 2 and complete the connection between the slenderized pier column 2, the steel main girder 1 and the pier foundation 3;

[0040] Construction stage 5: Remove the temporary dead load applied on the steel main girder 1. At this time, the slenderized pier column 2 generates a tensile force due to restricting the upward recovery of the elastic deformation of the steel main girder 1, and this tensile force is greater than the pressure generated by the slenderized pier column 1 under the action of the secondary permanent load and the live load of the bridge; then the construction of the bridge auxiliary facilities is carried out to complete the construction of the bridge.

[0041] The following further elaborates on the present utility model in detail with an actual project as an example.

[0042] This embodiment is a two-span steel structure beam-type pedestrian bridge with a span layout of (30 + 30) m, a bridge deck width of 7 m, a pier height of 5 m, and the steel main girder adopts a steel box girder with a beam height of 1.2 m. The steel box girder uses Q355C steel, the top and bottom plate thicknesses are both 16 mm, and there are 12×120 mm plate stiffeners with a spacing of 0.35 m between the plate stiffeners; the web thickness is 12 mm, and there are a total of 3 webs.

[0043] According to Figure 1 and Figure 2When designing using the existing technology, the calculation results show that the first vertical natural vibration frequency of the steel main girder is 3.18 Hz, meeting the requirement of not less than 3 Hz in the design specification (if the intermediate pier columns are not set, the first vertical natural vibration frequency of the steel main girder is 0.81 Hz, not meeting the requirement of not less than 3 Hz in the design specification); the maximum stress of the steel main girder is 73.2 Mpa, and the material strength utilization rate is only 26.6%; the maximum vertical reaction force of the pier column is 2752 kN, and the pier column bears a large vertical pressure. The pier column adopts a concrete circular cross-section pier column, and its diameter is about 800 mm to meet the force requirement. At this time, the slenderness ratio of the pier column is 6.25.

[0044] According to Figure 3 , Figure 4 and Figure 6 When designing using the technology of the present utility model, when the pier column adopts a steel pipe with a diameter of 200 mm and a wall thickness of 12 mm, the calculation results show that the first vertical natural vibration frequency of the steel main girder is still 3.18 Hz, meeting the requirement of not less than 3 Hz in the design specification; the maximum stress during the construction process of the steel main girder is 219.3 MPa, the maximum stress in the completed bridge state is 216.6 MPa, and the maximum stress in the service state is 238.4 MPa. The material strength utilization rate is increased to about 86.7%; the maximum tension of the pier column during the construction process is 1473 kN, the stress is 207.8 MPa, the tension in the completed bridge state is 1326 kN, and the minimum tension in the service state is 250 kN. The maximum tension in the service state is less than the maximum tension during the construction process. The pier column has been bearing tension during the use of the bridge and there is no instability problem. At this time, the slenderness ratio of the pier column is 25, which is 4 times the slenderness ratio of the pier column in the existing technology. If the pier column adopts a solid steel bar, its slenderness ratio can be further increased and the pier column will be more slender.

[0045] The above is only the preferred embodiment of the present utility model, and it is not a limitation to the present utility model in any other form. Any modification or equivalent change made according to the technical essence of the present utility model still belongs to the scope protected by the present utility model.

Claims

1. A steel structure beam-type landscape bridge with slenderized piers, comprising a steel main beam (1), slenderized piers (2), pier foundations (3), abutments (4) and end bearings (5), characterized in that: The steel main girder (1) is the superstructure of the bridge. The slenderized pier (2) is a steel structure member that bears tensile force and is arranged between two abutments (4). The upper end of the slenderized pier (2) is connected to the bottom of the steel main girder (1). The upper end of the pier foundation (3) is connected to the slenderized pier (2). The abutment (4) includes the abutment body and its foundation. The end support (5) is the connection support between the two ends of the steel main girder (1) and the abutment (4). The two ends of the steel main girder (1) are connected to the upper end of the abutment body of the abutment (4) through the end support (5).

2. The steel structure beam type landscape bridge with slender pier columns according to claim 1, characterized in that: The slenderized pier (2) adopts a column pier or a V-shaped pier, and one or at least two are arranged in the transverse direction of the bridge.

3. A steel structure beam-type landscape bridge with slender piers according to any one of claims 1 and 2, characterized in that: The cross-section form of the steel main girder (1) adopts a flat steel box girder.

4. A steel structure beam landscape bridge with slender piers according to any one of claims 1 and 2, characterized in that: The connection between the slenderized pier (2) and the steel main girder (1) and the pier foundation (3) is a rigid connection or a hinged connection.

5. A steel structure beam-type landscape bridge with slender piers according to any one of claims 1 and 2, characterized in that: One or at least two slenderized piers (2) are arranged in the longitudinal direction of the bridge.

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