A hoisting construction method for arch ribs of an integral large-span steel arch bridge of a highway engineering

Abstract

The application discloses a hoisting construction method for arch ribs of an integral large-span steel arch bridge of a highway engineering, and relates to the technical field of highway engineering construction. The application discloses a hoisting construction method for arch ribs of an integral large-span steel arch bridge of a highway engineering, and relates to the technical field of highway engineering construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering, in particular to a hoisting construction method for integral large-span steel arch bridge arch ribs of highway engineering. BACKGROUND

[0002] With the development of highway industry in China, more and more highways spread on the vast land of China, which not only improves the traffic construction, but also facilitates the people's life. The Jiang-Huai River Water Diversion Project is to connect the two water systems of the Yangtze River and the Huaihe River, and to benefit Anhui, Henan, the Huaihe River and the Yangtze River. It has great comprehensive benefits such as guaranteeing water supply, developing navigation and improving water environment. The traditional steel arch bridge is mostly double-arch rib, and is hoisted by setting a platform, which may affect navigation, and has long construction period and low efficiency, cannot save materials, and is not conducive to environmental protection. SUMMARY

[0003] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: a hoisting construction method for integral large-span steel arch bridge arch ribs of highway engineering, comprising a steel arch bridge,

[0004] S1, according to the provided working surface and overall construction plan, sufficient personnel are configured, all personnel need to be safety and technical debriefing, special operation personnel need to be on duty with certificate, be familiar with and review drawings, understand design content, clear the equipment and materials used in the project, clear the construction requirements put forward in the drawings, clear the cross cooperation of old bridge reuse construction and other projects, so as to take measures as soon as possible to ensure that there is no position conflict with other projects in the construction process; be familiar with other technical data related to the project, such as construction and acceptance specification, technical regulation, quality inspection and evaluation standard and product data provided by the manufacturer;

[0005] S2, sufficient production materials are prepared before construction, and the main materials such as section steel need to meet the requirements of relevant technical standards, and unqualified products are not allowed to be used. Steel structure products are processed in factory, and are transported to construction site for assembly according to the progress of the project;

[0006] S3, in order to reduce the construction of the working platform on site, the crane is directly used for landing and hoisting, the position site of the main bridge is treated before construction, the weeds and surface floating soil are removed, and then the site is rolled and leveled. According to the maximum load of the crane and the hoisted object, the bearing capacity of the foundation is detected, and the construction is carried out after meeting the requirements;

[0007] S4, the small longitudinal and transverse beams of the bridge deck system are not hoisted synchronously, but the end transverse beam and the main longitudinal beam are hoisted and connected into a whole after being hoisted in place, so as to ensure the stability of the subsequent hoisting of the lower bearing structure. The small longitudinal and transverse beams are hoisted at the same time as the left side and the middle arch ribs are hoisted. The small longitudinal and transverse beams of the bridge deck system are hoisted at the same time as the right side arch end transverse beam, the main longitudinal beam and the small longitudinal and transverse beams are hoisted.

[0008] S5. When the arch rib is hoisted to the position of the cross brace, the arch rib and the cross brace are hoisted simultaneously to further enhance the overall stability of the arch rib. Since the arch rib support is located on the main longitudinal beam and there are no connecting components on the left and right, the stability cannot be guaranteed. Connecting supports are set in the longitudinal and transverse directions of the support to connect the independent lattice supports into a whole and improve the overall stability of the support.

[0009] Preferably, since the main bridge is designed with three arch ribs, unlike the traditional method of installing beams first and then arches, the left half, namely the side and middle arch longitudinal beams, is installed first, and then the arch ribs are installed. At the same time, the right half of the side arch main longitudinal beams and small longitudinal and transverse beams are installed.

[0010] Preferably, after the right side arch end crossbeam, main longitudinal beam and small longitudinal and crossbeams are hoisted simultaneously from both ends, the arch rib is installed. At this time, a crane station area is left in the middle of the right side, so that after the left side is completely hoisted, the crane can leave the bridge deck position to hoist the remaining parts of the right side.

[0011] Preferably, the arch rib is installed first at the left transverse brace position, followed by the transverse brace, and then the small longitudinal and transverse beams are installed. The right side arch adopts the method of beam first and then arch.

[0012] Preferably, when the arch rib is hoisted to the position of the cross brace, the cross brace is installed first, and the bridge deck longitudinal and transverse beams are hoisted after the cross brace is installed in place.

[0013] Preferably, the original single-span hoisting is adjusted to simultaneous hoisting of the main longitudinal beam and the small longitudinal and transverse beams in both directions, which saves a lot of construction time and reduces the total project cost.

[0014] Preferably, the following steps are taken: providing safety briefings to on-site workers, clarifying on-site construction hazards and precautions, ensuring construction safety, calculating the coordinates of the support, promptly verifying measurement data, monitoring during construction, erecting a lattice steel pipe support on the main beam axis, calculating that the foundation bearing capacity meets the requirements, and conducting construction displacement detection.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention first hoists the left half, namely the side and middle arch longitudinal beams, and then hoists the arch ribs. At the same time, the right half's side arch main longitudinal beams and small longitudinal and transverse beams are hoisted. The left side cross bracing is installed first, and then the small longitudinal and transverse beams are installed. The right side arch adopts the beam-beam-then-arch method. This hoisting method is convenient for construction, saves construction time, and improves the overall stability of the side and middle arches.

[0017] After leveling the original ground, large-span ground hoisting construction was carried out, reducing unnecessary platform construction, reducing steel consumption, and saving costs. The arch rib support was equipped with longitudinal and transverse connecting supports to ensure the overall stability of the support. Attached Figure Description

[0018] Fig. 1 This is a flowchart of the construction process of the present invention;

[0019] Fig. 2 This is a schematic diagram of the hoisting elevation of the left side and the central arch longitudinal beam of the present invention;

[0020] Fig. 3 This is a schematic diagram of the hoisting of the right side arch of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figs. 1-3 This invention provides a technical solution: a method for hoisting and constructing the arch ribs of an integral large-span steel arch bridge for highway engineering, including a steel arch bridge.

[0023] S1. Based on the work area and overall construction plan provided on site, allocate sufficient personnel. All personnel must receive safety and technical briefings. Special operation personnel must be certified to work. Familiarize yourself with and review the drawings, understand the design content, clarify the equipment and materials used in the project, clarify the construction requirements proposed in the drawings, and clarify the cross-coordination between the old bridge reuse construction and other projects, so as to take measures in advance to ensure that there is no location conflict with other projects during the construction process; be familiar with other technical documents related to the project, such as construction and acceptance specifications, technical procedures, quality inspection and evaluation standards, and product information provided by the manufacturer.

[0024] S2. Sufficient production materials should be prepared before construction. Main materials such as steel sections must meet the relevant technical standards and be inspected before use. Unqualified products are not allowed to be used. Steel structure products are processed in the factory and transported from the processing plant to the construction site for assembly as needed according to the progress of the project.

[0025] S3. To reduce the need for on-site work platform construction, cranes will be used to directly lift the loads from the ground. The site at the main bridge location will be prepared before construction, removing weeds and surface soil, and then compacted and leveled. The bearing capacity of the foundation will be tested according to the maximum load capacity of the crane and the load. Construction will proceed only after the foundation meets the requirements.

[0026] S4. The small longitudinal and transverse beams of the bridge deck system were not hoisted simultaneously. Instead, the end transverse beams and main longitudinal beams were hoisted into place first and then connected to form a whole to ensure the stability of the lower load-bearing structure during subsequent hoisting. The small longitudinal and transverse beams were hoisted at the same time as the left side and middle arch ribs. At the same time, the end transverse beams, main longitudinal beams, and small longitudinal and transverse beams of the right side arch were hoisted. The small longitudinal and transverse beams of the bridge deck system were hoisted at the same time as the left arch ribs were hoisted.

[0027] S5. When the arch rib is hoisted to the position of the cross brace, the arch rib and the cross brace are hoisted simultaneously to further enhance the overall stability of the arch rib. Since the arch rib support is located on the main longitudinal beam and there are no connecting components on the left and right, the stability cannot be guaranteed. Connecting supports are set in the longitudinal and transverse directions of the support to connect the independent lattice supports into a whole and improve the overall stability of the support.

[0028] Because the main bridge is designed with three arch ribs, unlike the traditional method of installing beams before arches, the left half (i.e., the longitudinal beams of the side and central arches) is installed first, followed by the installation of the arch ribs. Simultaneously, the main longitudinal beams and minor longitudinal and transverse beams of the right half's side arches are installed. After the right side arch end transverse beams, main longitudinal beams, and minor longitudinal and transverse beams are installed simultaneously from both ends, the arch ribs are installed. At this point, a crane station area is left in the middle of the right side for the remaining parts of the right side to be installed after the left side is completely installed. The crane then leaves the bridge deck for the installation of the remaining parts of the right side. For the left side's cross braces, the arch ribs are installed first, followed by the cross braces, and then the minor longitudinal and transverse beams. For the right side arches, the beams are installed first. In the rear arch method, when the arch rib is hoisted to the position of the cross brace, the cross brace is installed first. After the cross brace is installed, the small longitudinal and transverse beams of the bridge deck are hoisted. The original single-span hoisting is changed to double-span bidirectional hoisting of the main longitudinal beam and the small longitudinal and transverse beams, which saves a lot of construction time and reduces the total project cost. Safety production briefings are given to the workers on site, clarifying the on-site construction hazards and precautions to ensure construction safety. The coordinates of the support are calculated and the measurement data is checked in a timely manner. Monitoring is carried out during the construction process. A lattice steel pipe support is built on the axis of the main beam. The foundation bearing capacity is calculated to meet the requirements. Construction displacement detection is carried out.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for hoisting and constructing the arch ribs of a monolithic large-span steel arch bridge for highway engineering, comprising a steel arch bridge, characterized in that: S1. Based on the work area and overall construction plan provided on site, allocate sufficient personnel. All personnel must receive safety and technical briefings. Special operation personnel must be certified to work. Familiarize yourself with and review the drawings, understand the design content, clarify the equipment and materials used in the project, clarify the construction requirements proposed in the drawings, and clarify the cross-coordination between the old bridge reuse construction and other projects, so as to take measures in advance to ensure that there is no location conflict with other projects during the construction process; be familiar with other technical documents related to the project, such as construction and acceptance specifications, technical procedures, quality inspection and evaluation standards, and product information provided by the manufacturer. S2. Sufficient production materials shall be prepared before construction. The main steel materials shall meet the relevant technical standards and be inspected before use. Unqualified products shall not be used. Steel structure products shall be processed in the factory and transported from the processing plant to the construction site for assembly as needed according to the progress of the project. S3. To reduce the construction of on-site work platforms, cranes will be used to directly lift the loads from the ground. The site of the main bridge will be prepared before construction, removing weeds and surface soil, and then compacting and leveling the surface. The bearing capacity of the foundation will be tested according to the maximum load capacity of the crane and the load. Construction will proceed only after the foundation meets the requirements. S4. The small longitudinal and transverse beams of the bridge deck system were not hoisted simultaneously. Instead, the end transverse beams and main longitudinal beams were hoisted into place first and then connected to form a whole to ensure the stability of the lower load-bearing structure during subsequent hoisting. The small longitudinal and transverse beams were hoisted at the same time as the left side and middle arch ribs. The right side arch end transverse beams, main longitudinal beams, and small longitudinal and transverse beams were hoisted at the same time. The small longitudinal and transverse beams of the bridge deck system were hoisted at the same time as the left arch ribs. The time overlap rate between the hoisting of the left arch ribs and the small longitudinal / transverse beams of the bridge deck system was not less than 60%. S5. When the arch rib is hoisted to the position of the cross brace, the arch rib and the cross brace are hoisted simultaneously to further enhance the overall stability of the arch rib. Since the arch rib support is set on the main longitudinal beam, there are no connecting components on the left and right sides, which makes it impossible to guarantee stability. Connecting supports are set in the longitudinal and transverse directions of the support to connect the independent lattice supports into a whole and improve the overall stability of the support. Since the main bridge is designed with three arch ribs, unlike the traditional method of beams first and then arches, the left half, namely the side and middle arch longitudinal beams, is hoisted first, and then the arch rib is hoisted. At the same time, the main longitudinal beams and small longitudinal and transverse beams of the right half of the side arch are hoisted. The axial deviation during the synchronous hoisting of the arch rib and the cross brace is controlled within 5mm.

2. The method for hoisting and constructing the arch ribs of an integral large-span steel arch bridge for highway engineering according to claim 1, characterized in that: After the right-side arch end crossbeam, main longitudinal beam, and minor longitudinal and transverse beams are hoisted simultaneously from both ends, the arch ribs are installed. At this time, a crane station area is left in the middle of the right side for the crane to exit the bridge deck after the left side is completely hoisted. The remaining parts of the right side are then hoisted.

3. The method for hoisting and constructing the arch ribs of a large-span steel arch bridge for highway engineering according to claim 2, characterized in that: For the left transverse brace, the arch rib is installed first, followed by the transverse brace, and then the small longitudinal and transverse beams are installed. For the right side arch, the beam-first, arch-later method is used.

4. The method for hoisting and constructing the arch ribs of a large-span steel arch bridge for highway engineering according to claim 1, characterized in that: When the arch rib is hoisted to the position of the cross brace, the cross brace is installed first. After the cross brace is installed in place, the longitudinal and transverse beams of the bridge deck are hoisted.

5. The method for hoisting and constructing the arch ribs of a large-span steel arch bridge for highway engineering according to claim 1, characterized in that: The original single-span hoisting method was changed to simultaneous hoisting of the main longitudinal beam and the small longitudinal and transverse beams in both directions, which saved a lot of construction time and reduced the total project cost.

6. The method for hoisting and constructing the arch ribs of a large-span steel arch bridge for highway engineering according to claim 1, characterized in that: Safety briefings were given to on-site workers to clarify on-site construction hazards and precautions, ensuring construction safety. The coordinates of the support were calculated, and the measurement data were checked in a timely manner. Monitoring was carried out during the construction process. A lattice steel pipe support was erected on the axis of the main beam, the foundation bearing capacity was calculated to meet the requirements, and construction displacement detection was carried out.

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