CN219240264U - A Polygonal Hollow Pier with Different Thickness and Variable Cross-section Applied to Curved Rigid Frame Bridge - Google Patents

Abstract

The utility model discloses a polygonal hollow bridge pier with different thickness and variable cross-section applied to a curved rigid frame bridge. Columnar structure, the pier body includes two oppositely arranged transverse straight sections and two oppositely arranged longitudinal straight sections, the transverse straight sections are parallel to the transverse direction of the bridge, and the longitudinal straight sections are parallel to the longitudinal direction of the bridge; the two ends of the longitudinal straight sections are respectively connected by The oblique section is connected with the horizontal straight section on the corresponding side. The length of the horizontal straight section is set to be gradually smaller in the direction from the bottom of the pier to the top of the pier. The length of the vertical straight section is set corresponding to the direction from the bottom of the pier to the top of the pier. The length dimension corresponds to the fixed value setting from the bottom of the pier to the top of the pier. The thickness of the inner longitudinal straight section near the curved inner side of the rigid frame bridge is greater than the thickness of the outer longitudinal straight section. The new structure uses less material and has a strong bearing capacity, which is suitable for curved rigid Use for bridge construction.

Description

A Polygonal Hollow Pier with Different Thickness and Variable Cross-section Applied to Curved Rigid Frame Bridge

technical field

The utility model relates to the technical field of bridge engineering, in particular to a polygonal hollow pier with different thickness and variable cross-section applied to a curved rigid frame bridge.

Background technique

Due to the structural characteristics of hollow cross-section piers, such as small longitudinal thrust stiffness and low building material consumption, they can well coordinate the response of external loads such as temperature, vehicle loads, wind loads, and earthquake loads to the bridge structure. The application of highway bridge construction is more and more extensive. At present, the main pier cross-section forms at home and abroad include circular hollow cross-section, round-end hollow cross-section, rectangular hollow cross-section, double-leg rectangular hollow cross-section, etc. However, due to their cross-sectional shape, circular and round-end piers are complicated to adjust the formwork during construction, and the construction efficiency is affected to a certain extent, and some studies have pointed out that their shear resistance is insufficient; while the rectangular hollow section is prone to stress concentration at the corner position, Local damage occurs, and the piers are easily damaged by local water erosion. In addition, the pier sections of existing curved bridges mostly adopt biaxially symmetrical sections, but this does not take into account the deviation of the center of gravity of the main girder, which cannot give full play to the material properties and increases the cost.

Chinese patent CN202123024547.X, although a railway hollow pier structure can improve construction efficiency, it is suitable for the support of straight bridges, but for curved steel bridges, its eccentric load cannot be avoided, which has a certain impact on the support of bridge piers .

Therefore, how to provide a polygonal hollow pier with variable thickness and cross-section, which has the characteristics of convenient and efficient construction, pier deformation coordination ability and good bearing performance, is an urgent problem to be solved by those skilled in the art.

Utility model content

In view of this, the utility model provides a polygonal hollow pier structure with different thickness and variable cross-section applied to the curved continuous rigid frame bridge. The pier is an important structure to bear and coordinate the stress and deformation transmitted by the upper main girder structure. Its shape and Structure has an important influence on bridge construction quality and safe operation. Therefore, the appropriate cross-sectional shape and three-dimensional structure of the pier can reasonably reduce the amount of material used and improve the mechanical properties of the pier. The bridge pier structure proposed in the present invention can ensure its load-bearing performance and reduce the amount of concrete. At the same time, considering the eccentric compression characteristics of the curved rigid frame bridge, it can improve the force characteristics of the bridge pier, and the construction is easy.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a hollow pier of polygonal different thickness and variable cross-section applied to a curved rigid frame bridge, including a pier body, a bearing platform and a main girder, and the pier body is fixed on the bearing Between the abutment and the main girder, the pier body is a polygonal hollow columnar structure. The pier body includes two oppositely arranged transverse straight sections and two oppositely arranged longitudinal straight sections. The transverse straight sections are parallel to the transverse direction of the bridge. The above-mentioned longitudinal straight line segment is parallel to the longitudinal bridge direction;

The two ends of the vertical straight section are respectively connected to the horizontal straight section on the corresponding side by connecting the oblique section, the length of the horizontal straight section is set corresponding to the gradual change from the bottom of the pier to the top of the pier, and the length of the vertical straight section Corresponding to the setting of decreasing first and then increasing in the direction from the bottom of the pier to the top of the pier, the length dimension of the connecting oblique section corresponds to the fixed value setting in the direction from the bottom of the pier to the top of the pier, and the thickness of the inner longitudinal straight section close to the bending inner side of the rigid frame bridge is greater than that of the outer longitudinal straight section Thickness dimension.

The beneficial effects of the utility model are: through the structural design of the pier body, it has stronger deformation resistance, and has stronger ultimate bearing capacity under the premise of less material and convenient construction, and is suitable for curved rigid structures. The bearing capacity of the bridge, specifically, the pier body is a polygonal hollow columnar structure, which saves materials while ensuring the structural strength. The polygonal pier cylinder can reflect light of different colors, which is safer and more beautiful. The thickness of the inner longitudinal straight line is greater than that of the outer longitudinal section. The thickness of the straight section can better bear the eccentric pressure generated by the center of gravity deviation characteristic of the upper main girder structure of the curved bridge, and the pier column wall corresponding to the curved inner side of the bridge has a greater bearing capacity and reduces its vertical displacement. Under the joint action of bending moment and concentrated force, the polygonal hollow pier with different thickness has a higher ultimate bearing capacity than the rectangular hollow section pier, and the length of the connecting oblique section corresponds to the fixed value from the bottom of the pier to the top of the pier, so there is no need to change the connecting oblique section Formwork is convenient for improving construction efficiency and ensuring construction quality.

Preferably, a plurality of transverse partitions are fixed at intervals along the height direction on the inner side wall of the pier body, the transverse partitions form a buffer platform, and a framed escalator is fixedly connected to the inner side wall of the pier body, so The side wall of the bridge pier body close to the escalator is provided with an escape hole for easy installation of the escalator.

The resulting technical effects are: the arranged transverse partitions form multiple buffer platforms, and the arranged framed escalators are convenient for construction workers, and also improve the safety of workers during construction.

Preferably, a concrete roof is fixedly connected between the top of the pier body and the main girder, and a plurality of vertical steel bars are arranged on the top of the pier body, and the tops of the vertical steel bars pass through the concrete roof and extend to the main girder middle.

The resulting technical effect is that the connection stability between the main girder and the top of the pier body is improved through the concrete roof and vertical reinforcement, and the anti-deformation coordination ability of the entire bridge structure is improved.

Preferably, a plurality of stabilizing steel bars are arranged vertically at the bottom of the pier body, and the bottom ends of the stabilizing steel bars extend into the cap.

The resulting technical effect is: the solid connection between the pier body and the foundation cap is realized by using the stable steel bars, and the connection stability between the pier body and the cap is strengthened.

Description of drawings

Fig. 1 is a bridge transverse section schematic diagram of a polygonal hollow pier structure with different thickness and variable section applied to a curved continuous rigid frame bridge of the present invention;

Fig. 2 is a bridge longitudinal section schematic diagram of a polygonal hollow pier structure with different thickness and variable section applied to a curved continuous rigid frame bridge according to the present invention;

Fig. 3 is a pier body cross-sectional schematic diagram of a polygonal hollow pier structure with different thickness and variable cross-section applied to a curved continuous rigid frame bridge according to the present invention;

Fig. 4 is a schematic diagram of the connection of the concrete top plate of the hollow bridge pier structure with polygonal different thickness and variable cross-section applied to the curved continuous rigid frame bridge of the present invention;

Fig. 5 is a schematic diagram of the connection of a polygonal hollow pier structure with variable thickness and cross-section applied to a curved continuous rigid frame bridge according to the present invention;

Fig. 6 is a pier body structure diagram of a polygonal hollow pier structure with variable thickness and cross-section applied to a curved continuous rigid frame bridge according to the present invention.

1 cap, 2 pier body, 21 horizontal straight section, 22 inner longitudinal straight section, 23 outer longitudinal straight section, 24 connecting oblique section, 3 main girder, 4 concrete roof, 5 transverse diaphragm, 6 framed escalator, 7 avoidance hole, 8 vertical steel bars, and 9 stable steel bars.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

Referring to the accompanying drawings 1 to 6 of the present utility model, according to an embodiment of the present utility model, a polygonal hollow pier with different thickness and variable cross-section applied to a curved rigid frame bridge includes a pier body 2, a cap 1 and a main girder 3, and a pier body 2 Fixed between the cap 1 and the main girder 3, the pier body 2 is an octagonal hollow column structure, specifically including two horizontal straight sections 21, two vertical straight sections (inner longitudinal straight section 22, outer longitudinal straight section 23) and four A connecting oblique section 24, the horizontal straight section 21 is parallel to the horizontal bridge direction, and the vertical straight section is parallel to the longitudinal bridge direction;

The two ends of the vertical straight section are respectively connected to the horizontal straight section 21 on the corresponding side through the connecting oblique section 24. The length dimension of the horizontal straight section 21 is set corresponding to the gradient from the bottom of the pier to the top of the pier, and the length dimension of the vertical straight section corresponds to the bottom of the pier. The direction to the top of the pier is first reduced and then increased. The length dimension of the connecting inclined section 24 corresponds to the fixed value from the bottom of the pier to the top of the pier, which is convenient for formwork construction _. The thickness of the outer longitudinal straight section 23 is _t1 , considering the effect of eccentric loads, improving the ultimate bearing capacity of the inner column wall of the pier, and avoiding large uneven vertical displacements.

The cross section of this type of pier is not symmetrical along the longitudinal direction, and the size of the longitudinal straight section is different. Due to the offset characteristics of the center of gravity of the upper girder of the curved continuous rigid frame bridge, the offset bending moment will cause the pier to bend to the inside of the curve, resulting in uneven vertical displacement. Coupled with the action of variable loads (car loads, wind loads), large compressive stresses will be generated on the inner side of the pier (corresponding to the inner side of the curved bridge). Therefore, the design thickness of the inner column wall parallel to the longitudinal bridge direction is greater than that of the outer column wall, as shown in Figure 3 (t ₂ >t ₁ ). The specific dimensions of t ₁ and t ₂ are selected according to the project scale and design requirements. The thickening measures of the inner column wall can make the pier better bear the stress transmitted from the main girder to the pier during the construction stage, bridge completion stage and operation stage, and reduce the stress concentration phenomenon at the corner of the pier.

In the cross-section, the length of the longitudinal straight line first decreases and then increases from the bottom of the pier to the top of the pier (as shown in Figure 2), while the length of the transverse straight line gradually decreases from the bottom of the pier to the top of the pier (as shown in Figure 1). However, the length and angle of the four oblique straight line segments are constant vertically. In the process of climbing formwork construction, the formwork only needs to move the formwork of the vertical and horizontal straight sections to meet the edge length of the corresponding height, so as to realize the two-way grading design of the pier, and the formwork of the 4 oblique straight sections does not need to be changed, which is convenient to improve construction efficiency and guarantee the construction quality.

In some other embodiments, a plurality of transverse partitions 5 are fixed at intervals along the height direction of the inner wall of the pier body 2, and the transverse partitions are fixed on the column wall of the longitudinal straight section and embedded in the column wall to a certain depth. 5 to form a buffer platform to facilitate the construction of the construction personnel. The inner wall of the pier body 2 is fixedly connected with a framed escalator 6. The specific framed escalator is fixed on the column wall of the longitudinal straight section on the same side as the transverse partition. The pier body 2 is close to A side wall of the escalator is provided with a hole 7 for avoiding the escalator to facilitate the installation of the escalator.

The new structure is a polygonal hollow concrete pier with different thickness and variable cross-section. It adopts a two-way grading design in the height direction, and the grading coefficient changes with the height, showing that the cross-sectional size changes from large to small and then large from the pier bottom to the pier top. The bottom of the pier body 2 is connected to the cap 1 , and the top of the pier body 2 is connected to the concrete roof 4 . Inside the pier, steel platforms formed by transverse diaphragms 5 are arranged at regular intervals, and framed escalators 6 are arranged on the inner wall of the pier, extending from the bottom of the pier to the top of the pier. Buffer platforms and framed escalators ensure the safety of maintenance or construction personnel.

In other specific embodiments, a concrete roof 4 is fixedly connected between the top of the pier body 2 and the main girder 3, a plurality of vertical steel bars 8 are arranged on the top of the pier body 2, and the tops of the vertical steel bars 8 pass through the concrete roof 4 and extend to the main beam 3 to enhance the stability of the overall structure.

In some other embodiments, a plurality of stabilizing steel bars 9 are arranged vertically at the bottom of the pier body 2 , and the bottom ends of the stabilizing steel bars 9 extend into the cap 1 to strengthen the connection between the cap and the pier body.

The octagonal hollow pier with different thickness and variable cross-section is arranged between the foundation cap 1 and the main girder 3 of the curved bridge, which plays a role in supporting the self-weight of the superstructure and coordinating stress and deformation for the main girder of the curved bridge. The pier body 2 of the polygonal hollow pier with different thickness and variable cross-section disclosed by the utility model is equipped with a steel cage inside to meet the performance requirements of the pier design such as compression resistance and shear resistance, and then concrete is filled and poured in sections on site to form the pier. In addition, thickening the pier wall thickness of the straight section 22 of the inner longitudinal bridge can improve the ability of the polygonal hollow pier with different thickness and variable cross-section to transfer loads in the coordinated curved upper main girder structure. In order to meet the bending moment envelope state of the pier in the whole life cycle, the pier body 2 is designed with two-way grading in the vertical direction, and the vertical cross-sectional size in the longitudinal direction of the bridge decreases gradually from the bottom of the pier to the top of the pier ; while the vertical cross-sectional dimension in the direction of the bridge changes from large to small and then large from the bottom of the pier to the top of the pier. This special cross-sectional structure can improve the overall strength of the pier and make the material properties fully utilized. At certain heights, transverse diaphragms are installed inside the pier columns as steel platforms to improve the ability of the hollow thin-walled high pier to limit lateral deformation and local stability. A ladder with a safety frame is installed inside the pier to ensure the construction work and safety of maintenance or construction personnel. The main body of the bridge pier of the utility model adopts the climbing formwork construction method. By setting the size of the connecting inclined section to remain unchanged along the longitudinal height, the adjustment of the climbing formwork formwork during construction can be reduced, and the construction efficiency and construction quality can be improved.

As shown in Figure 4, on the top of the pier, in order to enhance the load transfer and deformation coordination between the pier top and the main beam structure, a concrete top slab 4 is set to connect the pier top and the main beam structure, and the evenly distributed φ32 vertical The reinforcement bars 8 are extended to the concrete roof 4 and the main girder 3 to strengthen the connection between the pier top and the main girder 3, so that the pier can adapt and coordinate the loads borne by the main girder structure under various working conditions. As shown in Figure 5, in order to stabilize the connection between the hollow thin-walled high pier and the foundation in the utility model, a three-layer concrete foundation cap 1 is designed, and the uniform vertical φ32 stabilizing steel bars 9 inside the pier are extended to the foundation cap. Tai 1 Middle School.

As for the device and the method of use disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the related parts, please refer to the description of the method part.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. A polygonal hollow pier with variable thickness and variable cross-section applied to a curved rigid frame bridge, comprising a pier body, a cap and a girder, and the pier body is fixedly positioned between the cap and the girder, and is characterized in that, The pier body is a polygonal hollow columnar structure, and the pier body includes two oppositely arranged transverse straight sections and two oppositely arranged longitudinal straight sections, the transverse straight sections are parallel to the transverse bridge direction, and the longitudinal straight sections are parallel to the longitudinal Bridge direction; The two ends of the vertical straight section are respectively connected to the horizontal straight section on the corresponding side by connecting the oblique section, the length of the horizontal straight section is set corresponding to the gradual change from the bottom of the pier to the top of the pier, and the length of the vertical straight section Corresponding to the setting of decreasing first and then increasing in the direction from the bottom of the pier to the top of the pier, the length dimension of the connecting oblique section corresponds to the fixed value setting in the direction from the bottom of the pier to the top of the pier, and the thickness of the inner longitudinal straight section close to the bending inner side of the rigid frame bridge is greater than that of the outer longitudinal straight section Thickness dimension. 2. A polygonal hollow pier with different thickness and variable cross-section applied to a curved rigid frame bridge according to claim 1, characterized in that, on the inner side wall of the pier body along its height direction, a plurality of horizontal piers are fixed at intervals. The partition plate forms a buffer platform, the inner side wall of the pier body is fixedly connected with a framed escalator, and the side wall of the pier body close to the escalator is provided with an escape hole for easy installation of the escalator. 3. A polygonal hollow pier with different thickness and variable cross-section applied to a curved rigid frame bridge according to claim 2, wherein a concrete roof is fixedly connected between the top of the pier body and the main girder, and the A plurality of vertical steel bars are arranged on the top of the pier body, and the tops of the vertical steel bars pass through the concrete roof and extend into the main girder. 4. A polygonal hollow pier with different thickness and variable cross-section applied to a curved rigid frame bridge according to claim 3, characterized in that, the bottom of the pier body is vertically arranged with a plurality of stable steel bars, and the stable steel bars The bottom end extends into the platform.

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