Construction method for installing steel beams and arch ribs crossing riverway in segmented mode through support method

Abstract

The invention discloses a construction method for segmentally installing steel beams and arch ribs crossing a river channel through a support method, and belongs to the technical field of bridge construction. The construction method comprises the following steps that S1, temporary supports are installed in water; s2, starting to construct a bridge floor steel beam, wherein the bridge floor steel beam is mounted in sections; and S3, after the bridge deck steel beams are erected and folded, the upper arch rib structure is installed in a segmented mode. The structural design is reasonable, single-hole two-way navigation of river channel navigation is met, and the construction requirement for super-heavy steel beam splicing is met; and the main wind braces and the decorative wind braces are arranged between the main arch ribs and the auxiliary arch ribs, so that the effects of conciseness and attractiveness are achieved on the premise that the strength is met.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method for installing steel beams and arch ribs across a river in sections using a bracket method. Background Art

[0002] With the rapid development of bridge construction in my country, it is becoming more and more common to use steel structures for river-crossing bridges. In super-dangerous large projects with a span of more than 36m and heavy steel beam loads, it is required to meet the needs of single-hole two-way navigation in the river and the assembly and construction of ultra-wide heavy steel beams. Therefore, a construction method of installing steel beams and arch ribs across the river in sections using a bracket method is urgently needed. Summary of the invention

[0003] In order to achieve the above object, the present invention adopts the following technical solutions:

[0004] A construction method for installing steel beams and arch ribs across a river in sections by using a support method, the method comprising the following steps:

[0005] S1. Install temporary bracket in water;

[0006] S2. Construction of bridge deck steel beams. The bridge deck steel beams are installed in sections;

[0007] S3, after the bridge deck steel beam is erected and closed, the upper arch rib structure is installed in sections. Further, the steps of the bridge deck steel beam section construction are:

[0008] S21, hoisting of arch foot segment;

[0009] S22, hoisting of end cross beam segments and patching installation of flat joints between end cross beams;

[0010] S23, hoisting of tie beam segments;

[0011] S24, hoisting of middle cross beam segment;

[0012] S25, hoisting of small longitudinal beam;

[0013] S26, hoisting of bridge deck units;

[0014] S27. The bridge deck steel beams are hoisted until they are closed.

[0015] Furthermore, the installation steps of hoisting the arch foot segment in step S21 are:

[0016] S211, use hand chain hoist for simple positioning;

[0017] S212, arch foot lifting;

[0018] S213, roughly positioning the arch foot;

[0019] S214, accurately positioning the arch foot;

[0020] S215. After the arch foot measurement indicators meet the standards, the arch foot is temporarily reinforced.

[0021] Furthermore, the upper arch rib structure adopts a fully welded steel box structure, and the upper arch rib structure is symmetrically installed on the left and right sides of the bridge position. The upper arch rib structure includes two main arch ribs and two auxiliary arch ribs. The arch axis lines of the main arch ribs and the arch axis lines of the auxiliary arch ribs are both quadratic parabolas. The two main arch ribs are symmetrically arranged outwardly on both sides of the bridge deck steel beam, and the two auxiliary arch ribs are symmetrically arranged inwardly on both sides of the bridge deck steel beam.

[0022] Furthermore, decorative wind braces and main wind braces are provided between adjacent main arch ribs and auxiliary arch ribs, and inter-arch decorations are provided between two of the auxiliary arch ribs.

[0023] Furthermore, the installation sequence of the upper arch rib structure is:

[0024] S301, the secondary arch rib segments at both ends of the bridge deck steel beam are hoisted symmetrically;

[0025] S302, hoisting of the inter-arch decorative segments between the secondary arch ribs at both ends of the bridge deck steel beam;

[0026] S303, the main arch rib segments at both ends of the bridge deck steel beam are installed symmetrically;

[0027] S304, installation of main wind bracing between the main arch ribs and secondary arch ribs at both ends of the bridge deck steel beam;

[0028] S305, symmetrically hoist the adjacent secondary arch rib segments from both ends to the inner side;

[0029] S306, installing the inter-arch decorative segments between the adjacent secondary arch ribs from both ends to the inner side;

[0030] S307, symmetrically install the main arch rib segments from both ends to the inner adjacent ones;

[0031] S308, install the main wind brace between the adjacent main arch ribs and secondary arch ribs from both ends to the inside;

[0032] S309, install the decorative wind bracing segments between the adjacent main arch ribs and auxiliary arch ribs from both ends to the inner side;

[0033] S310, install the secondary wind brace between the adjacent main arch rib and the secondary arch rib from both ends to the inner side;

[0034] S311, hoisting of the secondary arch rib segment in the mid-span until it is closed;

[0035] S312, mid-span main wind bracing segmented hoisting;

[0036] S313, mid-span decorative wind bracing segment hoisting;

[0037] S314, the main arch rib segment in the middle of the span is hoisted until it is closed.

[0038] Beneficial effects:

[0039] The structure of the present invention is reasonably designed, which not only meets the requirements of single-hole two-way navigation of river navigation, but also meets the construction requirements of super-heavy steel beam assembly;

[0040] The present invention arranges a main wind brace and a decorative wind brace between the main arch rib and the auxiliary arch rib, so as to achieve simplicity and beauty while satisfying strength requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0042] Figure 2 This is a schematic diagram of the segmented hoisting of the arch rib of the present invention;

[0043] Figure 3 The present invention is installed with a flow chart.

[0044] Among them, 1. Bridge deck steel beam; 2. Main arch rib; 3. Secondary arch rib; 4. Main wind bracing; 5. Decorative wind bracing; 6. Arch decoration. DETAILED DESCRIPTION

[0045] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] Example 1

[0047] refer to Figure 1-Figure 3 A construction method for installing steel beams and arch ribs across a river in sections by using a bracket method, the method comprising the following steps:

[0048] S1. Install temporary bracket in water;

[0049] S2, constructing bridge deck steel beam 1, the bridge deck steel beam is installed in sections;

[0050] S3, after the bridge deck steel beam 1 is erected and closed, the upper arch rib structure is installed in sections.

[0051] The structure of the present invention is reasonably designed, which not only meets the single-hole two-way navigation of river navigation, but also meets the construction requirements of super-heavy steel beam assembly.

[0052] In this embodiment, the steps of segmented construction of the bridge deck steel beam 1 are as follows:

[0053] S21, hoisting of arch foot segment;

[0054] S22, hoisting of end cross beam segments and patching installation of flat joints between end cross beams;

[0055] S23, hoisting of tie beam segments;

[0056] S24, hoisting of middle cross beam segment;

[0057] S25, hoisting of small longitudinal beam;

[0058] S26, hoisting of bridge deck units;

[0059] S27. The bridge deck steel beam 1 is hoisted until it is closed.

[0060] In this embodiment, the installation steps of hoisting the arch foot segment in step S21 are:

[0061] S211, use hand chain hoist for simple positioning;

[0062] S212, arch foot lifting;

[0063] S213, roughly positioning the arch foot;

[0064] S214, accurately positioning the arch foot;

[0065] S215. After the arch foot measurement indicators meet the standards, the arch foot is temporarily reinforced.

[0066] During the specific implementation, the installation of the arch foot segment is an important part of the entire steel beam segment installation project, and the accuracy of the bottom axis positioning must be ensured, especially the three-dimensional coordinate values ​​of each control point of the upper port.

[0067] 1) Assembly site tire frame layout

[0068] Establish a control network. Based on the original construction control network and leveling network, set control points at the main bridge assembly site. Use the original control network starting point to form the main bridge construction control network, using both plane and elevation points. According to the data given by the design institute and in combination with the monitoring unit, use a computer to perform 1:1 layout to calculate the plane position and elevation of the steel structure. Layout the axis of the assembly site based on the control points that have been re-measured.

[0069] 2) Linear control

[0070] Firstly, taking the plane control network coordinates as the measuring points, set up a total station to lay out the central axis of the main bridge. According to the bridge axis, the bottom plate position line of the tie beam along the bridge direction and the crossbeam position axis across the bridge direction are laid out in sequence, and the axis number is marked. The ground elevation is measured and set at the intersection of the axes as the reference point for height adjustment, and the position of the cradle is accurately located. The control elevation and line shape are measured to the top of the assembly cradle.

[0071] 3) Elevation control

[0072] The relative elevation to the steel structure is calculated using the elevation measurement data of the top of the assembly bracket. Based on the difference calculated from the data, the elevation is adjusted to the correct position using the limit plate and jack before the steel beam is installed, and then the steel beam is installed. After the installation is completed, the linear shape and elevation of the steel beam are checked and accurately positioned.

[0073] 4) Installation of arch foot

[0074] The arch foot is installed by a simple bracket installation method. During the installation process, a hand winch is used for simple positioning. After the arch foot is lifted, it is placed on a simple bracket for rough positioning of the arch foot. After the arch foot is roughly positioned, the surveyor accurately positions the arch foot. During the positioning process, a hand winch is mainly used to adjust the position of the arch foot. The precise positioning of the arch foot is mainly based on the upper and lower left and right and elevation of the center line of the main arch, and the center lines on both sides of the arch foot are used as auxiliary observation points for measurement. After the various measurement indicators of the arch foot meet the standards, the arch foot is temporarily reinforced. After the hook is released, the arch foot is re-measured, and the data is checked for correction.

[0075] In this embodiment, the upper arch rib structure adopts a fully welded steel box structure, and the upper arch rib structure is symmetrically installed on the left and right sides of the bridge position. The upper arch rib structure includes two main arch ribs 2 and two auxiliary arch ribs 3. The arch axis of the main arch rib 2 and the arch axis of the auxiliary arch rib 3 are both quadratic parabolas. The two main arch ribs 2 are symmetrically arranged outwardly on both sides of the bridge deck steel beam 1, and the two auxiliary arch ribs 3 are symmetrically arranged inwardly on both sides of the bridge deck steel beam 1.

[0076] Preferably, the two main arch ribs 2 are symmetrically arranged on both sides of the bridge deck steel beam 1 at an outward inclination of 17 degrees, and the two auxiliary arch ribs 3 are symmetrically arranged on both sides of the bridge deck steel beam 1 at an inward inclination of 15 degrees.

[0077] During specific implementation, the secondary arch ribs 3 are installed first in the arch rib structure, and then the main arch ribs 2 are installed.

[0078] In this embodiment, a decorative wind brace 5 and a main wind brace 4 are provided between adjacent main arch ribs 2 and auxiliary arch ribs 3 , and an inter-arch decoration 6 is provided between two auxiliary arch ribs 3 .

[0079] The present invention provides a main wind brace 4 and a decorative wind brace 5 between the main arch rib and the auxiliary arch rib, which achieves simplicity and beauty while meeting the requirements of strength.

[0080] In this embodiment, the installation sequence of the upper arch rib structure is:

[0081] S301, symmetrical hoisting of the three segments of the secondary arch ribs located at both ends of the bridge deck steel beam 1;

[0082] S302, hoisting of 6 segments of the inter-arch decoration between the secondary arch ribs 3 at both ends of the bridge deck steel beam 1;

[0083] S303, the main arch rib 2 segments located at both ends of the bridge deck steel beam 1 are symmetrically installed;

[0084] S304, installing the main wind brace 4 between the main arch ribs 2 and the secondary arch ribs 3 at both ends of the bridge deck steel beam 1;

[0085] S305, symmetrically hoist the three adjacent segments of the secondary arch ribs from both ends to the inner side;

[0086] S306, installing 6 segments of inter-arch decoration between the adjacent secondary arch ribs 3 from both ends to the inside;

[0087] S307, symmetrically install the two main arch rib segments from both ends to the inner side;

[0088] S308, installing the main wind brace 4 between the adjacent main arch ribs 2 and secondary arch ribs 3 from both ends to the inner side;

[0089] S309, installing the decorative wind bracing 5 segments between the adjacent main arch ribs 2 and the secondary arch ribs 3 from both ends to the inner side;

[0090] S310, installing the secondary wind brace between the adjacent main arch rib 2 and the secondary arch rib 3 from both ends to the inner side;

[0091] S311, hoisting of 3 segments of auxiliary arch ribs in the mid-span until they are closed;

[0092] S312, mid-span main wind bracing 4-section hoisting;

[0093] S313, hoisting of 5 sections of mid-span decorative wind bracing;

[0094] S314, two sections of the main arch ribs in the mid-span are hoisted until they are closed.

[0095] In specific implementation, the inter-arch decoration is a connecting structure between the auxiliary arch ribs 3, and there are two situations during installation.

[0096] Case 1: Installed as a patch segment.

[0097] Case 2: Assemble into blocks with the three segments of auxiliary arch ribs on both sides and then install.

[0098] According to the structural characteristics, the wind brace is divided into a through main wind brace 4 and a secondary wind brace. The installation is carried out in the order of main wind brace 4 → decorative wind brace 5 → secondary wind brace.

[0099] In specific implementation, the steel arch rib segment installation is carried out according to the following steps:

[0100] (1) Preparation for lifting

[0101] Check the steel arch rib segment numbers in detail to ensure they are correct, clean the dirt on the surface of the steel arch rib segments, and check the length, geometric dimensions, and markings of the steel arch rib segments.

[0102] Based on the steel arch rib model, the technical department submitted the positioning coordinates of the upper end of the steel arch rib segment to the surveyor, and the surveyor took position.

[0103] (2) Installation of temporary facilities

[0104] Before lifting the steel arch rib sections, the operating platform, climbing ladder, anti-fall rope or anti-fall device should be preset on the steel arch rib sections and firmly connected to the steel arch rib sections; the ladder and the steel arch rib sections are welded and fixed by supporting parts, which can be made of round steel with the same specifications as the ladder, L50*3 angle steel or 10mm thick flat steel bars, and the vertical spacing of the supporting parts is about 3 meters. The operating platform and the connecting plate on the decorative plate are connected by bolts. After the platform is removed, the connecting plate on the decorative plate is cut off and the cut seam is polished flat.

[0105] (3) Lifting of steel arch ribs in sections

[0106] The steel arch rib segment hoisting adopts the 4-point hoisting method. The length of the wire rope should ensure that the angle between the two adjacent ropes is no more than 60 degrees after the steel arch rib segment is tied. At the same time, the hemp rope is tied to the bolt hole of the ear plate at the upper end of the steel arch rib as a slip rope. In order to facilitate the adjustment of the steel arch rib segment to a tilted state close to the position, except for one lifting point that directly uses the wire rope, the other three lifting points are in the form of wire rope + hand winch, and the tilt angle of the steel arch rib segment is adjusted by the retraction and extension of the hand winch.

[0107] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A construction method for installing steel beams and arch ribs across a river in sections by using a bracket method, characterized in that: The method comprises the following steps: S1. Install temporary bracket in water; S2. Construction of bridge deck steel beams. The bridge deck steel beams are installed in sections; S3. After the bridge deck steel beams are erected and closed, the upper arch rib structure is installed in sections.

2. The construction method for installing steel beams and arch ribs across a river in sections by using a bracket method according to claim 1 is characterized in that: The steps of segmented construction of the bridge deck steel beam are as follows: S21, hoisting of arch foot segment; S22, hoisting of end cross beam segments and patching installation of flat joints between end cross beams; S23, hoisting of tie beam segments; S24, hoisting of middle cross beam segment; S25, hoisting of small longitudinal beam; S26, hoisting of bridge deck units; S27. The bridge deck steel beams are hoisted until they are closed.

3. The construction method for installing steel beams and arch ribs across a river in sections by using a bracket method according to claim 2 is characterized in that: The installation steps of hoisting the arch foot segment in step S21 are: S211, use hand chain hoist for simple positioning; S212, arch foot lifting; S213, roughly positioning the arch foot; S214, accurately positioning the arch foot; S215. After the arch foot measurement indicators meet the standards, the arch foot is temporarily reinforced.

4. The construction method for installing steel beams and arch ribs across a river in sections by using a bracket method according to claim 1 is characterized in that: The upper arch rib structure adopts a fully welded steel box structure. The upper arch rib structure is symmetrically installed on the left and right sides of the bridge position. The upper arch rib structure includes two main arch ribs and two auxiliary arch ribs. The arch axis lines of the main arch ribs and the arch axis lines of the auxiliary arch ribs are both quadratic parabolas. The two main arch ribs are symmetrically arranged outwardly on both sides of the bridge deck steel beam, and the two auxiliary arch ribs are symmetrically arranged inwardly on both sides of the bridge deck steel beam.

5. The construction method for installing steel beams and arch ribs across a river in sections by using a bracket method according to claim 4 is characterized in that: Decorative wind braces and main wind braces are arranged between adjacent main arch ribs and auxiliary arch ribs, and inter-arch decorations are arranged between two of the auxiliary arch ribs.

6. The construction method for installing steel beams and arch ribs across a river in sections by using a bracket method according to claim 5 is characterized in that: The installation sequence of the upper arch rib structure is: S301, the secondary arch rib segments at both ends of the bridge deck steel beam are hoisted symmetrically; S302, hoisting of the inter-arch decorative segments between the secondary arch ribs at both ends of the bridge deck steel beam; S303, the main arch rib segments at both ends of the bridge deck steel beam are installed symmetrically; S304, installation of main wind bracing between the main arch ribs and secondary arch ribs at both ends of the bridge deck steel beam; S305, symmetrically hoist the adjacent secondary arch rib segments from both ends to the inner side; S306, installing the inter-arch decorative segments between the adjacent secondary arch ribs from both ends to the inner side; S307, symmetrically install the main arch rib segments from both ends to the inner adjacent ones; S308, install the main wind brace between the adjacent main arch ribs and secondary arch ribs from both ends to the inside; S309, install the decorative wind bracing segments between the adjacent main arch ribs and auxiliary arch ribs from both ends to the inner side; S310, install the secondary wind brace between the adjacent main arch rib and the secondary arch rib from both ends to the inner side; S311, hoisting of the secondary arch rib segment in the mid-span until it is closed; S312, mid-span main wind bracing segmented hoisting; S313, mid-span decorative wind bracing segment hoisting; S314, the main arch rib segment in the middle of the span is hoisted until it is closed.

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