Construction method of steel tube arch rib of concrete-filled steel tube arch bridge

Abstract

The invention discloses a construction method of a steel tube arch rib of a concrete-filled steel tube arch bridge. The construction method comprises construction of piers, a steel main beam, a construction support and a tower. Half-span arch ribs of side spans are constructed on the construction supports, and arch rib sections of the side spans and middle spans are hoisted on the two sides of the tower frame at the same time; two half-span arch ribs of the side span are closed, and the construction support is dismantled; the arch rib sections of the midspan continue to be hoisted in sequence, and the arch rib sections of the midspan are resisted by additionally arranging buckle cables through the weight of the side spans till half-span arch ribs of the midspan are formed; and closing the two half-span arch ribs of the midspan, and removing the buckle cables and the tower to finish the construction of the arch ribs. The unbalanced hoisting technology is adopted, the construction efficiency is improved, the construction difficulty and the construction risk are reduced, and the construction period is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a construction method for a steel tube concrete arch bridge steel tube arch rib. Background Art

[0002] Steel tube concrete arch bridges have the advantages of high rigidity, strong bearing capacity, and low maintenance costs, and are widely used in mountainous areas. When building steel tube concrete arch bridges in plain areas, tie arch bridges are usually used. When building steel tube arches, cable cranes are usually used to transport arch ribs. When using cable cranes, towers need to be built at both ends of the arch bridge, and then the anchors of the cable cranes are arranged outside the towers, which takes up a lot of space. After the arch rib segments are transported to the installation location by cable cranes, the cable needs to be tensioned to support the arch ribs until the arch ribs are closed. However, when the steel tube concrete arch bridge to be built is a multi-span continuous arch, if the cable hoisting process is used, it is necessary to arrange a very high tower to erect the cables and a huge anchor to anchor the cables, which not only increases the construction difficulty, but also increases the construction cost. Therefore, for the construction of multi-span steel tube concrete arch bridges in plain areas, it is of great significance to find a safe, applicable, economical, fast and efficient method for the construction of the joint section to shorten the construction period and reduce the construction risk. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a construction method for steel tube arch ribs of a steel tube concrete arch bridge, so as to solve the problems of the prior art such as great construction difficulty, high safety risk and long construction period.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: a construction method of a steel tube concrete arch bridge steel tube arch rib, comprising the following steps: a) constructing bridge piers and erecting support brackets below the steel main beam of the arch bridge, and then constructing the steel main beam on the support brackets to form an arch bridge foundation, wherein the arch bridge foundation has two side spans and at least one middle span; b) A construction support is set up on the steel main beam of the side span within the half span range on the side away from the middle span, and a tower is set up on the pier between the side span and the middle span; if there are multiple middle spans, a tower is set up on each pier of the middle span; c) Multiple arch rib segments are hoisted sequentially on the construction support, and the multiple arch rib segments are sequentially connected to form a half-span arch rib of the side span; d) The 1# arch rib segments of the side span and the middle span are hoisted simultaneously on both sides of the tower near the side span, and the 1# arch rib segments of the side span and the middle span are connected to the tower through cable clips. Then, the 2# arch rib segments, 3# arch rib segments, ... N# arch rib segments of the side span and the middle span are hoisted simultaneously on both sides of the tower in sequence, and each arch rib segment is connected to the tower through cable clips and connected in sequence until the half-span arch rib of the side span and the arch rib of the middle span in a cantilever state are formed; e) Close the two half-span arch ribs of the side span and remove the construction support; f) Continue to hoist the N+1# arch rib segment, N+2# arch rib segment…M# arch rib segment of the middle span in sequence, and each arch rib segment is connected to the tower frame through a cable and connected in sequence. During the hoisting process, each time a middle span arch rib segment is hoisted, a cable is added on the side of the tower frame close to the side span, with its two ends connected to the tower frame and the arch rib of the side span respectively, until a half-span arch rib of the middle span is formed; when there are multiple middle spans, the arch rib segments of the middle span are hoisted on both sides of each tower frame of the adjacent middle span at the same time and connected in sequence, until half-span arch ribs of the middle span are formed on both sides of the tower frame on each pier of the middle span; g) Close the two half-span arch ribs of the middle span, remove the cables and towers, and complete the construction of the arch ribs.

[0005] As an optimization, the arch bridge includes two side spans and two middle spans, wherein the span of the middle span is greater than the span of the side span.

[0006] As an optimization, a truck crane is used to lift the arch rib segments.

[0007] As an optimization, in step f, the additional cables are connected at the mid-span position of the side span arch rib.

[0008] Compared with the prior art, the present invention has the following advantages: 1) The half-span arch rib segment of the side span is installed with brackets, replacing the cable, tower and back anchor cable, as well as the anchor for anchoring the back anchor cable, saving construction costs and construction difficulty.

[0009] 2) A truck crane is used instead of a cable crane, making construction more convenient.

[0010] 3) After the side spans are closed, the weight of the side spans is used to resist the cantilever weight of the remaining arch rib segments in the middle span, which solves the installation problem of unbalanced forces caused by the unequal span arch ribs during installation and achieves safe closure of the middle span arch ribs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the state after step a is completed; Figure 2 This is a schematic diagram of the state after step b is completed; Figure 3 This is a schematic diagram of the state after step d is completed; Figure 4 This is a schematic diagram of the state after the middle span is closed; Figure 5 This is a schematic diagram of the state after the arch rib construction is completed; In the figure, 1 is the bridge pier, 2 is the supporting bracket, 3 is the construction bracket, 4 is the tower, 5 is the steel main beam, 6 is the side span arch rib segment, 7 is the middle span arch rib segment, and 8 is the cable. DETAILED DESCRIPTION

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0013] 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 claimed invention, 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 creative work are within the scope of protection of the present invention.

[0014] 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.

[0015] Example: See Figure 1-Figure 5The purpose of the present invention is to provide a construction method for the arch ribs of a steel tube concrete arch bridge with multiple unequal spans, so as to solve the problem of using traditional cable hoisting to hoist the arch ribs, and also solve the problem of using traditional cable and tower to construct the side span arch ribs. The bridge on which the present invention relies is the Yellow River Bridge in Shandong, which spans the Yellow River with a total length of 900m and is a continuous arch bridge with four unequal spans. The arch bridge includes two side spans and two middle spans, wherein the span of the middle span is greater than the span of the side span. The overall idea is to use a car crane instead of a cable crane, that is, to use a car crane to hoist the arch ribs. The side span arch is constructed by the bracket method. After the side span arch is closed, the bracket is removed, and the weight of the side arch is used to resist the weight of the remaining segments of the main span arch rib, that is, an unbalanced lifting process is adopted.

[0016] The specific steps include: a) constructing bridge piers 1 and erecting support brackets 2 below the arch bridge steel main beam 5, and then constructing the steel main beam 5 on the support brackets 2 to form an arch bridge foundation, wherein the arch bridge foundation has two side spans and at least one middle span. In this embodiment, the arch bridge includes two side spans and two middle spans, wherein the span of the middle span is greater than the span of the side span.

[0017] b) A construction support 3 is set up on the steel main beam 5 of the side span within the half span range on the side away from the middle span, and a tower 4 is set up on the pier 1 between the side span and the middle span; when there are multiple middle spans, a tower 4 is set up on each pier 1 of the middle span; c) A truck crane is used to sequentially hoist a plurality of side span arch rib segments 6 on the construction support 3 to form a half-span arch rib of the side span.

[0018] d) The 1# arch rib segments of the side span and the middle span are hoisted on both sides of the tower 4 at the same time. The 1# arch rib segments of the side span and the middle span are connected to the tower 4 through the cable 8. The 2# arch rib segments, 3# arch rib segments ... 9# arch rib segments of the side span and the middle span are hoisted on both sides of the tower 4 in sequence by a truck crane. Each arch rib segment is connected to the tower 4 through the cable 8 to keep the balance of both sides of the tower 4 until the half-span arch rib of the side span and the arch rib of the middle span are cantilevered; e) Use a truck crane to lift the closure section to close the two half-span arch ribs of the side span, and remove the construction support 3; f) Use a truck crane to continue to hoist the 10# arch rib segment, 11# arch rib segment…13# arch rib segment of the middle span in sequence, and each arch rib segment is connected to the tower 4 through a cable 8. During the hoisting process, each time a middle span arch rib segment 7 is hoisted, a cable 8 is added to the side of the tower 4 close to the side span, with its two ends connected to the tower 4 and the arch rib of the side span respectively. The added cable 8 is connected to the mid-span position of the side span arch rib, relying on the weight of the side span to resist the weight of the remaining arch rib segments of the middle span until the half-span arch rib of the middle span is formed, at which time the structure reaches the maximum cantilever state.

[0019] g) Use a truck crane to lift the joint section to close the two half-span arch ribs of the middle span, and remove the cable 8 and tower 4 to complete the construction of the arch rib.

[0020] In summary, the present invention solves the construction problems of multiple unequal-span continuous arch bridges: 1) The half-span arch rib segment of the side span is installed with brackets, replacing the cable, tower and back anchor cable, as well as the anchor for anchoring the back anchor cable, saving construction costs and construction difficulty.

[0021] 2) A truck crane is used instead of a cable crane, making construction more convenient.

[0022] 3) After the side spans are closed, the weight of the side spans is used to resist the cantilever weight of the remaining arch rib segments in the middle span, which solves the installation problem of unbalanced forces caused by the unequal span arch ribs during installation and achieves safe closure of the middle span arch ribs.

[0023] 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. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A construction method for a steel tube concrete arch bridge steel tube arch rib, characterized in that: The following steps are included: a) constructing bridge piers and erecting support brackets below the steel main beam of the arch bridge, and then constructing the steel main beam on the support brackets to form an arch bridge foundation, wherein the arch bridge foundation has two side spans and at least one middle span; b) A construction support is set up on the steel main beam of the side span within the half span range on the side away from the middle span, and a tower is set up on the pier between the side span and the middle span; if there are multiple middle spans, a tower is set up on each pier of the middle span; c) Multiple arch rib segments are hoisted sequentially on the construction support, and the multiple arch rib segments are sequentially connected to form a half-span arch rib of the side span; d) The 1# arch rib segments of the side span and the middle span are hoisted simultaneously on both sides of the tower near the side span, and the 1# arch rib segments of the side span and the middle span are connected to the tower through cable clips. Then, the 2# arch rib segments, 3# arch rib segments, ... N# arch rib segments of the side span and the middle span are hoisted simultaneously on both sides of the tower in sequence, and each arch rib segment is connected to the tower through cable clips and connected in sequence until the half-span arch rib of the side span and the arch rib of the middle span in a cantilever state are formed; e) Close the two half-span arch ribs of the side span and remove the construction support; f) Continue to hoist the N+1# arch rib segment, N+2# arch rib segment…M# arch rib segment of the middle span in sequence, and each arch rib segment is connected to the tower frame through a cable and connected in sequence. During the hoisting process, each time a middle span arch rib segment is hoisted, a cable is added on the side of the tower frame close to the side span, with its two ends connected to the tower frame and the arch rib of the side span respectively, until a half-span arch rib of the middle span is formed; when there are multiple middle spans, the arch rib segments of the middle span are hoisted on both sides of each tower frame of the adjacent middle span at the same time and connected in sequence, until half-span arch ribs of the middle span are formed on both sides of the tower frame on each pier of the middle span; g) Close the two half-span arch ribs of the middle span, remove the cables and towers, and complete the construction of the arch ribs.

2. The construction method of a steel tube concrete arch bridge steel tube arch rib according to claim 1, characterized in that: The arch bridge comprises two side spans and two middle spans, wherein the span of the middle span is greater than the span of the side span.

3. The construction method of a steel tube concrete arch bridge steel tube arch rib according to claim 1, characterized in that: The arch rib segments are hoisted using a truck crane.

4. The construction method of a steel tube concrete arch bridge steel tube arch rib according to claim 3, characterized in that: In step f, the added cables are connected at the mid-span position of the side span arch rib.

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