Construction method of annular overbridge main beam at crossroad

Abstract

The invention discloses a construction method for a main beam of an annular overpass at a crossroad. The construction method comprises the following steps: respectively pouring at least two pier studs on a sidewalk between two adjacent lanes; temporary supports are erected in the middle of three lanes, and dividing and blanking of main beam sections are conducted on an annular overbridge main beam; a first main beam section is installed on a sidewalk on one side of a lane without a temporary support, all pier studs on the sidewalk at the position are used for supporting the first main beam section, other main beam sections are installed in sequence, one end of the main beam section is fixedly connected with the corresponding previous main beam section, and the other end of the main beam section is fixedly connected with the other main beam section. And the other end of the main beam section is overhung on the outer side of the pier column or the temporary support supported below the main beam section, the tail main beam section is installed until supporting installation of the main beam section corresponding to the last pier column is completed, and the two ends of the tail main beam section are fixedly connected with the end of the previous main beam section and the end of the first main beam section respectively. The number of temporary supports is reduced, and normal passing of pedestrians and vehicles during construction is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of pedestrian overpass construction, and in particular to a construction method for a main beam of a circular overpass at a crossroad. Background Art

[0002] With the continuous development of cities, urban traffic congestion and safety have become a problem for large and medium-sized cities. Pedestrian overpasses can be used for pedestrians to avoid conflicts when traffic and pedestrian flows intersect. It not only ensures people's safe crossing of the street, but also improves the efficiency of vehicle traffic, while reducing the occurrence of traffic accidents, and to a certain extent solves the traffic congestion and safety problems caused by urban development. Steel box girders are widely used in the main beams of pedestrian overpasses due to their advantages of fast construction speed. The traditional installation method of the main beam of the steel box girder of the pedestrian overpass is to process the main beam in sections, set temporary brackets at the interface between the sections, and hoist them in sections on site. However, in the case of cross intersections, the length of the main beam segment is limited by transportation, so the length of each main beam segment is short, and a large number of temporary brackets need to be set up on site to assist in supporting the main beam segment. Not only will the large number of temporary brackets prolong the construction period, but also increase the construction cost. In addition, these temporary brackets will occupy the sidewalks and roadways, so during the construction of the main beam, it will affect the travel and traffic of surrounding residents. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a construction method for the main beam of a circular overpass at a crossroads which can shorten the construction period, reduce the construction cost, and reduce the impact on traffic.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A construction method for a main beam of a circular bridge at a crossroad, comprising: casting at least two piers for supporting the main beam of the circular bridge on a sidewalk between two adjacent lanes according to the position where the main beam of the circular bridge is to be installed, and all the piers are arranged around the center direction of the position where the main beam of the circular bridge is to be installed; setting up temporary brackets for supporting the main beam of the circular bridge in the middle of three lanes according to the position where the main beam of the circular bridge is to be installed, dividing the main beam of the circular bridge into main beam segments, ensuring that the first main beam segment is supported by at least two piers, and the remaining main beam segments are supported by at least one pier, or one temporary bracket, or one temporary bracket and at least one pier; installing the first main beam segment on the sidewalk on the sidewalk of the lane without the temporary bracket, and the sidewalk at this position All piers are used to support the first main beam segment. Both ends of the first main beam segment are cantilevered on the outside of all the corresponding supporting piers below it. The remaining main beam segments are installed in sequence along the circumferential direction of the main beam of the circular overpass to be installed on the side of the first main beam segment facing the adjacent temporary bracket. One end of this main beam segment is fixedly connected to its corresponding previous main beam segment, and the other end is cantilevered on the outside of the pier or temporary bracket supporting it below, until the support and installation of the main beam segment corresponding to the last pier is completed, and the outer end of the main beam segment at this position is cantilevered on the outside of the last pier. Then the last main beam segment is installed, and both ends of the last main beam segment are fixedly connected to the ends of the previous main beam segment and the first main beam segment respectively, thereby completing the installation of the main beam of the entire circular overpass, and finally removing the temporary bracket.

[0005] In the present invention, the first main beam segment installed can obtain stable support through the piers, and then when the remaining main beam segments are installed, they can be supported by the main beam segment of the previous section and the piers or temporary supports; in addition, the present invention only sets up temporary supports in the middle position of three of the lanes, and when the main beam segments are hoisted on the lane, only half of the lane is occupied, so it will not affect the traffic of the other half of the lane, reducing the impact on traffic.

[0006] As an optimization, the pier is a cylindrical structure, a rectangular support is cast on the top of the pier along its center line, the diagonal length of the rectangular support is smaller than the diameter of the pier, a rubber pad is fixedly connected at the center of the top surface of the rectangular support, connecting plates are pre-embedded on the top surface of the rectangular support and in the width direction of the main beam segment corresponding to the pier along the rectangular support, and after the main beam segment is installed on the top of the rectangular support, anti-overturning supports are respectively installed between the connecting plates and the main beam segment above, and the overturning supports are respectively fixedly connected to the connecting plates and the main beam segment, which can prevent the main beam segment from overturning toward both sides after installation.

[0007] As an optimization, the two ends of the last main beam segment are respectively connected to the corresponding upper main beam segment and the first main beam segment by a Z-shaped interface. The Z-shaped interface can be closed smoothly and conveniently.

[0008] Compared with the prior art, the present invention reduces the number of temporary supports and the cost of main beam installation measures by reasonably dividing the sections and setting anti-overturning devices on the pier tops, while reducing road occupation, ensuring the normal passage of pedestrians and vehicles during the main beam construction and reducing the impact on the surrounding areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the plan layout of the main beam segment at the crossroad in the present invention Figure 2 A top view of the pier in the present invention; Figure 3 The vertical layout of the main beam segment in the present invention is as follows Figure Ⅰ ; Figure 4 The vertical layout of the main beam segment in the present invention is as follows Figure II . DETAILED DESCRIPTION

[0010] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0011] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0012] according to Figures 1 to 4As shown, the construction method of the main beam of the circular flyover at the intersection in this specific embodiment is to cast two piers 1 for supporting the main beam of the circular flyover on the sidewalk between two adjacent lanes according to the position where the main beam of the circular flyover is to be installed, and all the piers 1 are arranged around the center direction of the position where the main beam of the circular flyover is to be installed; a temporary bracket 2 for supporting the main beam of the circular flyover is set up in the middle position of the lanes of three lanes according to the position where the main beam of the circular flyover is to be installed, and the main beam of the circular flyover is divided and cut into main beam segments to ensure that the first main beam segment is supported by at least two piers 1, and the remaining main beam segments are supported by at least one pier 1, or one temporary bracket 2, or one temporary bracket 2 and at least one pier 1; the first main beam segment 3 is installed on the sidewalk on the side of the lane without the temporary bracket 2, and the two The piers 1 are used to support the first main beam segment 3. The two ends of the first main beam segment 3 are cantilevered on the outside of the two corresponding supporting piers 1 below it. The remaining main beam segments 3 are installed in sequence along the circumferential direction of the main beam of the circular overpass to be installed on the side of the first main beam segment 3 facing the adjacent temporary bracket 2. One end of the main beam segment 3 is fixedly connected to the corresponding previous main beam segment 3, and the other end is cantilevered on the outside of the pier 1 or temporary bracket 2 supported below it, until the support and installation of the main beam segment 3 corresponding to the last pier 1 is completed, and the outer end of the main beam segment 3 at this position is cantilevered on the outside of the last pier 1, and then the last main beam segment 3 is installed, and the two ends of the last main beam segment 3 are respectively fixedly connected to the ends of the previous main beam segment 3 and the first main beam segment 3, thereby completing the installation of the entire circular overpass main beam, and finally removing the temporary bracket 2.

[0013] In this specific embodiment, the pier 1 is a cylindrical structure, and a rectangular support 4 is cast on the top of the pier 1 along its center line direction. The diagonal length of the rectangular support 4 is smaller than the diameter of the pier 1, and a rubber pad 5 is fixedly connected to the center of the top surface of the rectangular support 4. Connecting plates 6 are pre-embedded on the top surface of the rectangular support 4 and located on the rectangular support 4 along the width direction of the main beam segment 3 corresponding to the pier 1. After the main beam segment 3 is installed on the top of the rectangular support 4, anti-overturning supports 7 are respectively installed between the connecting plates 6 and the main beam segment 3 above, and the overturning supports 7 are respectively fixedly connected to the connecting plates 6 and the main beam segment 3.

[0014] In this specific implementation manner, both ends of the last main beam segment 3 are connected to the corresponding previous main beam segment 3 and the first main beam segment 3 by using a Z-shaped interface.

[0015] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described with reference to the preferred embodiments of the present invention, it should be understood by those skilled in the art that various changes may be made in form and details without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. A construction method for a main beam of a circular overpass at a crossroad, characterized in that: At least two piers for supporting the main beam of the circular bridge are cast on the sidewalk between two adjacent lanes according to the position where the main beam of the circular bridge is to be installed, and all the piers are arranged around the center direction of the position where the main beam of the circular bridge is to be installed; temporary brackets for supporting the main beam of the circular bridge are erected in the middle positions of three lanes according to the position where the main beam of the circular bridge is to be installed, and the main beam of the circular bridge is divided and cut into main beam segments to ensure that the first main beam segment is supported by at least two piers, and the remaining main beam segments are supported by at least one pier, or one temporary bracket, or one temporary bracket and at least one pier; the first main beam segment is installed on the sidewalk on the side of the lane without a temporary bracket, and all the piers on the sidewalk at this position are used to support the first main beam segment. The beam segments are supported, and the two ends of the first main beam segment are cantilevered on the outside of all the corresponding supported piers below it. The remaining main beam segments are installed in sequence along the circumferential direction of the main beam of the circular overpass to be installed on the side of the first main beam segment facing the direction of the adjacent temporary bracket. One end of this main beam segment is fixedly connected to its corresponding previous main beam segment, and the other end is cantilevered on the outside of the pier or temporary bracket supported below it, until the support and installation of the main beam segment corresponding to the last pier is completed, and the outer end of the main beam segment at this position is cantilevered on the outside of the last pier, and then the last main beam segment is installed, and the two ends of the last main beam segment are respectively fixedly connected to the ends of the previous main beam segment and the first main beam segment, thereby completing the installation of the main beam of the entire circular overpass, and finally removing the temporary bracket.

2. The construction method of the main beam of the circular overpass at a crossroad according to claim 1 is characterized by: The pier is a cylindrical structure, and a rectangular support is cast on the top of the pier along its center line direction. The diagonal length of the rectangular support is smaller than the diameter of the pier, and a rubber pad is fixedly connected to the center of the top surface of the rectangular support. Connecting plates are pre-embedded on the top surface of the rectangular support and located on the rectangular support along the width direction of the main beam segment corresponding to the pier. After the main beam segment is installed on the top of the rectangular support, anti-overturning supports are installed between the connecting plate and the main beam segment above, and the overturning supports are fixedly connected to the connecting plate and the main beam segment, respectively.

3. The construction method of the main beam of the circular overpass at a crossroad according to claim 1 is characterized by: The two ends of the last main beam segment are respectively connected to the corresponding upper main beam segment and the first main beam segment by using a Z-shaped interface.

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