Unlock instant, AI-driven research and patent intelligence for your innovation.

Closure construction method for continuous rigid frame beam of lower dragging extra-large bridge

A technology for super-large bridges and rigid-frame girders, which is applied in the construction field of continuous rigid-frame girders for Xiatuo super-large bridges. It can solve the problems of unbalanced beams, large height differences, and low construction efficiency of the main bridge, so as to improve construction efficiency and speed up construction. Speed, the effect of ensuring the balance of the beam body

Inactive Publication Date: 2020-06-16
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP +3
View PDF10 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional bridge construction method, when the main bridge is constructed in one direction, the girders at both ends of the main pier are unbalanced, requiring a large amount of counterweight manually and adjusting the counterweight at any time as the main bridge is constructed in one direction, which greatly reduces the cost of the main bridge. construction efficiency
At the same time, after the construction of the main bridge is completed, the approach bridge body will be constructed and the side spans will be closed. There will be a large height difference, and the beam body of the closed section needs to be manually lifted, which also reduces the construction efficiency of the side spans.
Therefore, in view of the problems of low construction efficiency of the main bridge and low efficiency of closing the side spans in the traditional bridge construction, the present invention discloses a construction method for closing the continuous rigid frame girders of the super-large bridge.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Closure construction method for continuous rigid frame beam of lower dragging extra-large bridge
  • Closure construction method for continuous rigid frame beam of lower dragging extra-large bridge
  • Closure construction method for continuous rigid frame beam of lower dragging extra-large bridge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of continuous rigid frame girder closing construction method of the lower drag super large bridge of the present embodiment, such as Figure 1-Figure 3 shown, including the following steps:

[0034] Step A, pre-construct the continuous slab girder of the approach bridge and the cover beam of the junction pier on both sides of the main bridge before the construction of the main bridge, and reserve tensioning operation holes on the cover beam of the junction pier and the continuous slab girder of the approach bridge;

[0035] Step B. Concrete pouring of No. 0# beam section is carried out on the top of the main pier and hanging baskets are installed on both sides of the No. 0# beam section concrete;

[0036] Step C, the hanging baskets on both sides are moved forward synchronously and symmetrically, and the subsequent cantilever beam sections are poured symmetrically until the middle span and side span;

[0037] Step D, performing mid-span closure in mid-span pouri...

Embodiment 2

[0046] This embodiment is further optimized on the basis of embodiment 1, such as figure 1 As shown, the step D includes the following sub-steps:

[0047] Step D1, after the mid-span closing section is poured, a 180t jacking force is applied to both ends of the mid-span closing section to ensure that the relative displacement of the mid-span is less than or equal to 8cm;

[0048] Step D2, installing a stiff frame on the mid-span closing section and forming a mold to bind the steel bars, and then closing and locking the stiff frame;

[0049] Step D3, pressurizing and counterweighting the closing section of the mid-span and pouring and pouring the closing section of the connecting mid-span, and then performing reinforced concrete curing;

[0050] Step D4, after the concrete is derived until the concrete strength reaches the standard, the longitudinal prestressed steel tendons in the span are stretched in batches and anchored and grouted.

[0051] According to embodiment 1, con...

Embodiment 3

[0062] This embodiment is further optimized on the basis of above-mentioned embodiment 1 or 2, such as figure 1 As shown, the step E includes the following sub-steps:

[0063] Step E1, pouring the cantilevered section of the side span in the unbalanced side span, and then stretching the longitudinal prestressed steel cables in the span in batches and anchoring and grouting;

[0064] Step E2, synchronously installing the rear anchor cables of the hinged piers at the side spans on both sides;

[0065] Step E3, pre-embed section steel on the junction pier, set up brackets on the pre-embedded section steel, and pour side span cast-in-place sections on the brackets;

[0066] Step E4, remove the ballast and counterweight of the mid-span and pour the side-span closing section to close the side-span, complete the erection of the hollow slab of the approach bridge and balance the weight of the junction pier.

[0067] After the mid-span closing construction is completed, the side-span...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a closure construction method for continuous rigid frame beams of a drop-down extra-large bridge, which comprises the following steps of: constructing approach bridge continuous plate beams and junction pier capping beams on two sides of a main bridge in advance before the construction of the main bridge, and reserving tensioning operation holes on the capping beams and theapproach bridge continuous plate beams of junction piers; pouring 0 # beam section concrete at the top of the main pier, synchronously and symmetrically moving forwards for T-shaped symmetrical circulation on the two sides of the 0 # beam section concrete, and pouring subsequent cantilever beam sections until the mid-span and the side span are reached; mid-span closure is conducted on the mid-span pouring mid-span closure section; pouring a side span suspended pouring section and a side span cast-in-place section on the side span imbalance; pouring a side span closure section at the side spancast-in-place section to perform side span and approach bridge continuous plate girder closure, performing tensioning anchor sealing through a reserved tensioning operation hole, and performing secondary plugging on the tensioning operation hole after tensioning anchor sealing is completed; the method has the beneficial effects that the main bridge construction efficiency is effectively improved,and the side span closing efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method for closing continuous rigid frame beams of the Xiatuo super-large bridge. Background technique [0002] Bridge construction generally adopts the steps of first constructing the main bridge body towards the mid-span, then constructing the main bridge body towards the side spans, and finally the approach bridge bodies at both ends, and then performing the steps of closing the mid-span and closing the side spans. However, in the traditional bridge construction method, when the main bridge is constructed in one direction, the girders at both ends of the main pier are unbalanced, requiring a large amount of counterweight manually and adjusting the counterweight at any time as the main bridge is constructed in one direction, which greatly reduces the cost of the main bridge. construction efficiency. At the same time, after the constructio...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E01D21/00E01D21/10E01D101/28
CPCE01D21/00E01D21/10E01D2101/28
Inventor 汤振亚徐少平马天昌常艳花苏春生郝玉峰孟凡伟郭万辉郭建强姜信贺姜波梁朋刚张庆
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP