Fabricated arch foot mounting structure of concrete-filled steel tube arch bridge

Abstract

The utility model discloses an assembly type arch foot installation structure of a concrete filled steel tube arch bridge, which comprises a steel arch seat and an arch foot section installed on the steel arch seat, the steel arch seat is installed on a foundation, and a steel main beam is installed on the foundation; wherein the steel skewback is provided with a mounting surface perpendicular to the length direction of the arch foot section, a positioning structure is arranged on the mounting surface, the arch foot section is obliquely arranged, and the lower end of the arch foot section is fixedly connected with the positioning structure and the steel skewback respectively; a stay cable mounting seat is further arranged on the steel arch seat and connected with the arch foot section through a stay cable, so that the arch foot section is subjected to tension in the direction close to the steel arch seat, a support is arranged on the side, close to the arch foot section, of the steel arch seat and connected with the steel arch seat, the lower end of the support abuts against the steel main beam, and the upper end of the support abuts against the lower side of the arch foot section. And the arch foot section is subjected to upward supporting force. The utility model has the advantages of simple structure and assembly construction, improves the construction efficiency, reduces the construction difficulty and shortens the construction period.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to an assembled arch foot installation structure of a steel tube concrete arch bridge. Background Art

[0002] Currently, the arch foot section of a steel tube concrete-filled arch bridge is typically equipped with a hinge axis. During the pouring of the arch seat concrete, the pre-embedded steel tube section and the steel arc groove are first embedded in the arch seat. The arch foot section of the arch rib is then installed. During installation, the hinge axis is embedded in the arc groove to achieve a mating connection. At the same time, the steel tube of the arch foot section and the pre-embedded steel tube section are aligned. Finally, at an appropriate time, the patch section (a section of steel tube connecting the arch foot section steel tube and the pre-embedded steel tube section) is welded together to connect the steel tube of the arch foot section and the pre-embedded steel tube section into a whole, thus forming a stable arch foot. However, this arch foot section is complex in structure and requires high component installation precision during construction. Therefore, it is of great significance to find a safe, applicable, economical, fast, and efficient arch foot section installation structure to shorten the construction period and reduce construction risks. Summary of the Invention

[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide an assembled arch foot installation structure for a steel tube concrete arch bridge, so as to solve the problems of complex construction and difficult positioning in the prior art.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is as follows: an assembled arch foot installation structure of a steel tube concrete arch bridge, comprising a steel arch seat and an arch foot section installed on the steel arch seat, the steel arch seat being installed on a foundation, and a steel main beam being installed on the foundation; wherein, the steel arch seat has a mounting surface perpendicular to the length direction of the arch foot section, and a positioning structure is provided on the mounting surface, the arch foot section is obliquely arranged, and its lower end is fixedly connected to the positioning structure and the steel arch seat respectively; a cable mounting seat is also provided on the steel arch seat, and the cable mounting seat is connected to the arch foot section through a cable, so that the arch foot section is subjected to a tensile force in the direction close to the steel arch seat, and a bracket is provided on the side of the steel arch seat close to the arch foot section, the bracket is connected to the steel arch seat, and the lower end of the bracket is against the steel main beam, and the upper end is against the lower side of the arch foot section, so that the arch foot section is subjected to an upward supporting force.

[0005] As an optimization, the arch foot section includes an upper chord steel pipe and a lower chord steel pipe, which are connected as a whole by diagonal braces. The positioning structure includes a plurality of positioning ribs vertically welded on the mounting surface of the steel arch seat, and the positioning ribs are radially arranged around the circumference of the upper chord steel pipe and the lower chord steel pipe.

[0006] As an optimization, the cable mounting seat is arranged at the top end of the steel arch seat and is connected to the upper chord steel pipe of the arch foot section through an obliquely arranged cable.

[0007] As an optimization, the bracket includes a vertically arranged supporting steel pipe and a triangular support frame connected to the supporting steel pipe and the steel arch seat respectively. The lower end of the supporting steel pipe is against the steel main beam, and a pad is provided at the upper end, which is in contact with the lower chord steel pipe of the arch foot section.

[0008] As an optimization, the steel arch seat is formed by splicing a plurality of steel plates, has a cavity inside, and is filled with expansive concrete.

[0009] Compared with the prior art, the utility model has the following advantages:

[0010] 1) The steel arch seat, arch foot section, and positioning ribs are pre-fabricated in the factory and assembled on-site to ensure installation quality. After the steel arch seat is installed, it is filled with micro-expansive high-performance concrete, which improves the arch seat's compressive strength while reducing the need for formwork for the concrete pouring process.

[0011] 2) Temporary cable tensioning of the arch foot section replaces the problem of repeatedly adjusting the position of the arch foot section with auxiliary devices such as jacks, saving construction costs.

[0012] 3) During installation, the three positioning ribs at the bottom of the lower chord steel pipe of the arch foot section are installed in advance. They not only play the role of positioning the arch foot section, but also play a supporting role after being fixed, which facilitates construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the installation structure of the utility model;

[0014] In the figure, 1 is the steel arch seat, 2 is the arch foot section, 3 is the positioning rib plate, 4 is the cable mounting seat, 5 is the bracket, 6 is the foundation, and 7 is the steel main beam. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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. 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 utility model for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0017] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not require further definition or explanation in subsequent figures. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the figures, or the positions or relationships in which the inventive product is typically placed when in use. These terms are intended solely for ease of description and simplification of the present invention and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance. Furthermore, terms such as "horizontal" and "vertical" do not imply that a component must be absolutely horizontal or overhanging, but rather may be slightly tilted. For example, "horizontal" simply refers to a direction that is more horizontal than "vertical," and does not imply that the structure must be completely horizontal, but rather may be slightly tilted. It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0018] Example: See Figure 1 The arch seat of the utility model adopts a steel arch seat, the arch foot section and the steel arch seat are welded, and a positioning rib plate is used to connect the steel arch seat and the arch foot section. The steel arch seat, the arch foot section and the positioning rib plate are all processed in advance in the steel yard and the factory, and the assembled construction at the construction site not only greatly saves construction time, but also ensures the installation accuracy of the arch foot section. At the same time, temporary support is used to improve the safety of construction.

[0019] Specifically, the utility model provides an assembled arch foot mounting structure for a steel tube concrete arch bridge, comprising a steel arch seat 1 and an arch foot section 2 mounted on the steel arch seat 1, wherein the steel arch seat 1 is mounted on a foundation 6, and a steel main beam 7 is mounted on the foundation 6; wherein the steel arch seat 1 has a mounting surface perpendicular to the length direction of the arch foot section 2, and a positioning structure is provided on the mounting surface, and the arch foot section 2 is arranged obliquely, and its lower end is fixedly connected to the positioning structure and the steel arch seat 1, respectively. Specifically, the arch foot section 2 comprises an upper chord steel pipe and a lower chord steel pipe, and the upper chord steel pipe and the lower chord steel pipe are connected as a whole by an oblique brace, and the positioning structure comprises a plurality of positioning ribs 3 vertically welded on the mounting surface of the steel arch seat 1, and the positioning ribs 3 are radially arranged around the circumference of the upper chord steel pipe and the lower chord steel pipe. During construction, several positioning ribs 3 on the lower side are first welded according to the installation position of the arch foot section 2 to form an arc-shaped support positioning surface. Then the arch foot section 2 is hoisted by a crane so that the upper chord steel pipe and the lower chord steel pipe of the arch foot section 2 are respectively made in the arc-shaped support positioning surface, thereby quickly achieving preliminary positioning and support.

[0020] A cable mounting seat 4 is also provided on the steel arch seat 1. The cable mounting seat 4 is connected to the arch foot section 2 through a cable, so that the arch foot section 2 is subjected to tension in the direction close to the steel arch seat 1. A bracket 5 is provided on the side of the steel arch seat 1 close to the arch foot section 2. The bracket 5 is connected to the steel arch seat 1, and the lower end of the bracket 5 abuts against the steel main beam 7, and the upper end abuts against the lower side of the arch foot section 2, so that the arch foot section 2 is subjected to an upward supporting force. Specifically, the cable mounting seat 4 is provided at the top of the steel arch seat 1 and is connected to the upper chord steel pipe of the arch foot section 2 through an obliquely provided cable. The bracket 5 includes a vertically provided support steel pipe and a triangular support frame respectively connected to the support steel pipe and the steel arch seat 1. The lower end of the support steel pipe abuts against the steel main beam 7, and the upper end is provided with a pad, which abuts against the lower chord steel pipe of the arch foot section 2. In this way, by tensioning the cable, the arch foot section 2 is made to fit tightly against the installation surface of the steel arch seat 1 to prevent it from slipping. At the same time, the weight of the entire arch foot section 2 is supported by the supporting steel pipe to improve its installation stability. Finally, the arch foot section 2 is welded to the steel arch seat 1 and the positioning ribs 3, and then the remaining positioning ribs 3 are welded, so that the positioning ribs 3 can eventually play the role of stiffening plates after completing the positioning function, thereby improving the strength of the connection.

[0021] In addition, the steel arch seat 1 is made of multiple steel plates spliced ​​together, with a cavity inside, and the cavity is filled with micro-expansive high-performance concrete to improve the compressive resistance of the steel arch seat 1. At the same time, it has a simple structure and is easy to construct, saving traditional casting formwork and thereby improving construction efficiency.

[0022] In summary, the present utility model,

[0023] 1) The steel arch seat, arch foot section, and positioning ribs are pre-fabricated in the factory and assembled on-site to ensure installation quality. After the steel arch seat is installed, it is filled with micro-expansive high-performance concrete, which improves the arch seat's compressive strength while reducing the need for formwork for the concrete pouring process.

[0024] 2) Temporary cable tensioning of the arch foot section replaces the problem of repeatedly adjusting the position of the arch foot section with auxiliary devices such as jacks, saving construction costs.

[0025] 3) During installation, the three positioning ribs at the bottom of the lower chord steel pipe of the arch foot section are installed in advance. They not only play the role of positioning the arch foot section, but also play a supporting role after being fixed, which facilitates construction.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Ordinary technicians in this field should understand that those modifications or equivalent replacements of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An assembled arch foot installation structure for a steel tube concrete arch bridge, characterized by: It includes a steel arch seat and an arch foot section installed on the steel arch seat, the steel arch seat is installed on a foundation, and a steel main beam is installed on the foundation; wherein, the steel arch seat has a mounting surface perpendicular to the length direction of the arch foot section, and a positioning structure is provided on the mounting surface, the arch foot section is obliquely arranged, and its lower end is fixedly connected to the positioning structure and the steel arch seat respectively; a cable mounting seat is also provided on the steel arch seat, the cable mounting seat is connected to the arch foot section through a cable, so that the arch foot section is subjected to a tensile force in the direction close to the steel arch seat, and a bracket is provided on the side of the steel arch seat close to the arch foot section, the bracket is connected to the steel arch seat, and the lower end of the bracket is against the steel main beam, and the upper end is against the lower side of the arch foot section, so that the arch foot section is subjected to an upward supporting force.

2. The assembled arch foot installation structure of a steel tube concrete arch bridge according to claim 1, characterized in that: The arch foot section includes an upper chord steel pipe and a lower chord steel pipe, which are connected as a whole by a diagonal brace. The positioning structure includes a plurality of positioning ribs vertically welded on the mounting surface of the steel arch seat, and the positioning ribs are radially arranged around the circumference of the upper chord steel pipe and the lower chord steel pipe.

3. The assembled arch foot installation structure of a steel tube concrete arch bridge according to claim 2, characterized in that: The cable mounting seat is arranged on the top end of the steel arch seat and is connected to the upper chord steel pipe of the arch foot section through an obliquely arranged cable.

4. The assembled arch foot installation structure of a steel tube concrete arch bridge according to claim 2, characterized in that: The bracket includes a vertically arranged supporting steel pipe and a triangular supporting frame respectively connected to the supporting steel pipe and the steel arch seat. The lower end of the supporting steel pipe is against the steel main beam, and a pad is provided at the upper end, which is in contact with the lower chord steel pipe of the arch foot section.

5. The assembled arch foot installation structure of a steel tube concrete arch bridge according to claim 1, characterized in that: The steel arch seat is formed by splicing a plurality of steel plates, and has a cavity inside, which is filled with expansion concrete.

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