Construction method of deepwater large-span tied beam

Abstract

The application discloses a construction method of a deep-water large-span tied beam, which comprises the following steps: firstly, a tied beam section in a cofferdam is constructed, and a middle tied beam cavity prefabricated section is synchronously prefabricated; after a pier body is out of water, a conflict part of a cofferdam steel pipe pile in the tied beam range and the tied beam is cut off; then, the tied beam cavity prefabricated section is integrally hoisted to the top of the cofferdam steel pipe pile after the cutting; water in the cofferdam is pumped out; a closure section cast-in-situ hanger between two ends of the tied beam cavity prefabricated section and the tied beam section in the cofferdam which has been poured is installed; concrete in the closure section and the cavity in the tied beam cavity prefabricated section is poured; after the concrete reaches a design strength, the closure section cast-in-situ hanger and the cofferdam are removed; and finally, the deep-water large-span tied beam is obtained. The application has the advantages of simple operation, short construction period, reduced equipment and large amount of material investment, and greatly reduced construction cost and risk.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, and in particular to a construction method for deep-water, long-span tie beams. Background Technology

[0002] With the rapid development of my country's economy, the construction of transportation infrastructure has also been vigorously carried out, and the number of bridges built on rivers and lakes is increasing. Bridge engineering tie beams, as a connection structure between two or more piles and piers, increase the overall rigidity and improve the stress on the pile and pier structure.

[0003] Conventional construction methods for deep-water long-span tie beams mainly include the integral pier cofferdam method and the deep-water tie beam suspended cofferdam method. Both of these methods are characterized by large equipment and material investment, long construction period and high safety risks. Summary of the Invention

[0004] The purpose of this invention is to propose a construction method for deep-water long-span tie beams. This method is simple to operate, has a short construction period, reduces the input of equipment and a large amount of materials, greatly reduces construction costs and risks, and effectively solves the problem that existing deep-water tie beams require the construction of new tie beam caisson cofferdams or integral pier cofferdams.

[0005] The objective of this invention has been achieved through actual experimentation:

[0006] A construction method for deep-water, long-span tie beams, characterized by the following specific construction steps:

[0007] A. Construct two cofferdams for the same pier, and pour the pier cap and pier body within each cofferdam.

[0008] B. Construct a section of the inner tie beam of the cofferdam on the upper inner sidewall of each of the two piers;

[0009] C. Simultaneously prefabricate the hollow sections of the tie beam on an open space off-site;

[0010] D. After the pier body emerges from the water, the steel pipe piles of the cofferdam within the range of the tie beam are cut underwater down to the bottom elevation of the tie beam to obtain the cut cofferdam steel pipe piles.

[0011] E. The precast section of the tie beam cavity is hoisted as a whole to the top of the cut cofferdam steel pipe piles, between the tie beam sections of the two cast cofferdams, and water is pumped out and stopped inside the pier cofferdam;

[0012] F. Install the closure section cast-in-place hanger at both ends of the precast tie beam cavity precast section and within the closure range between the tie beam sections in the cast-in-place cofferdam;

[0013] G. Pour the concrete for the tie beam closure section on the cast-in-place suspension frame of the closure section;

[0014] H. Pour concrete into the cavity of the precast section of the tie beam.

[0015] I, the concrete in the cavity of the tie beam closure section and the tie beam cavity prefabricated section reaches the design strength, the closure section cast-in-place hanger and the pile cap cofferdam are removed, and the deep water large-span tie beam is obtained.

[0016] The present application adopts the following method: first, the tie beam section in the cofferdam is constructed, and the intermediate tie beam cavity prefabricated section is prefabricated synchronously; after the pier body is out of water, the conflict part of the cofferdam steel pipe pile in the tie beam range and the tie beam is cut off; then, the tie beam cavity prefabricated section is hoisted integrally to the top of the cofferdam steel pipe pile after cutting; the cofferdam is pumped out; the closure section cast-in-place hanger between the two ends of the tie beam cavity prefabricated section and the tie beam section in the cofferdam is installed; the concrete in the tie beam closure section and the cavity of the tie beam cavity prefabricated section is poured; after the concrete reaches the design strength, the closure section cast-in-place hanger and the pile cap cofferdam are removed, and the deep water large-span tie beam is obtained.

[0017] Therefore, the present application has the following advantages:

[0018] 1. Only a single small pile cap cofferdam needs to be designed and constructed according to the size of the pile cap, and a large-size overall pile cap cofferdam is not needed to surround all the pile caps, which greatly saves the cofferdam structure material, bottom sealing concrete, construction cost and construction period;

[0019] 2. Only the closure section cast-in-place hanger is needed to be set, and a large-scale tie beam cast-in-place support structure is not needed to be set;

[0020] 3. The tie beam section in the cofferdam and the tie beam cavity prefabricated section can be constructed synchronously with the pier body structure, which does not occupy the construction period and effectively saves the construction period;

[0021] 4. The use of the cavity prefabricated section in the middle of the tie beam can effectively reduce the lifting weight of the large-span tie beam and reduce the investment of large-scale hoisting equipment;

[0022] 5. The operation is simple, the construction period is short, the equipment and a large amount of material investment are reduced, and the construction cost and risk are greatly reduced.

[0023] The present application effectively solves the problem that the existing deep water tie beam needs to be re-set with a tie beam hoist box cofferdam or an overall pile cap cofferdam for construction. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a front view of the construction of the deep water large-span tie beam;

[0025] Figure 2 It is a plan view of the construction of the deep water large-span tie beam;

[0026] In the figure: 1 is a pile cap; 2 is a pier body; 3 is a pile cap cofferdam; 4 is a tie beam section in the cofferdam; 5 is a tie beam cavity prefabricated section; 6 is a closure section cast-in-place hanger; 7 is a tie beam closure section; 8 is a cofferdam steel pipe pile after cutting. DETAILED DESCRIPTION

[0027] The application will be described in further detail below with reference to the embodiments and to the accompanying drawings.

[0028] A construction method of a deep-water large-span tied beam is as follows:

[0029] A, two pile caps cofferdams 3 at the same pier position are constructed, and the pile caps 1 and the pier bodies 2 are poured in the respective pile cap cofferdams 3;

[0030] B, one cofferdam inner tied beam segment 4 is respectively constructed on the upper inner side wall of each of the two pier bodies 2;

[0031] C, a tied beam cavity prefabricated segment 5 is synchronously prefabricated on an empty land outside the site;

[0032] D, after the pier bodies 2 are out of water, the pile cap cofferdam steel pipe piles in the range of the tied beam are cut off to the tied beam bottom elevation underwater, and the cut-off cofferdam steel pipe piles 8 are obtained;

[0033] E, the tied beam cavity prefabricated segment 5 is integrally hoisted to the top of the cut-off cofferdam steel pipe piles 8, between the two cofferdam inner tied beam segments 4 which have been poured, the water in the pile cap cofferdams 3 is pumped out, and the water stop is performed;

[0034] F, a closure segment cast-in-situ hanger 6 is installed in the closure range between the two ends of the prefabricated tied beam cavity prefabricated segment 5 and the cofferdam inner tied beam segments 4 which have been poured;

[0035] G, the concrete of the tied beam closure segment 7 is poured on the closure segment cast-in-situ hanger 6;

[0036] H, the concrete is poured in the cavity of the tied beam cavity prefabricated segment 5;

[0037] I, after the concrete in the tied beam closure segment 7 and the cavity of the tied beam cavity prefabricated segment 5 reaches the design strength, the closure segment cast-in-situ hanger 6 and the pile cap cofferdams 3 are removed, and the deep-water large-span tied beam is obtained.

[0038] The application is not limited to the above-mentioned best mode, and anyone can derive other various forms of products under the inspiration of the application, but regardless of any changes in shape or structure, any technical solution with the same or similar to the application is within the protection scope.

[0039] The contents not described in detail in the specification belong to the prior art known by the person skilled in the art.

Claims

1. A construction method for a deep-water, long-span tie beam, characterized in that: The specific construction steps are as follows: A. Construct two cofferdams for the same pier, and pour the pier cap and pier body within each cofferdam. B. Construct a section of the inner tie beam of the cofferdam on the upper inner sidewall of each of the two piers; C. Simultaneously prefabricate the hollow sections of the tie beam on an open space off-site; D. After the pier body emerges from the water, the steel pipe piles of the cofferdam within the range of the tie beam are cut underwater down to the bottom elevation of the tie beam to obtain the cut cofferdam steel pipe piles. E. The precast section of the tie beam cavity is hoisted as a whole to the top of the cut cofferdam steel pipe piles, between the tie beam sections of the two cast cofferdams, and water is pumped out and stopped inside the pier cofferdam; F. Install the closure section cast-in-place hanger at both ends of the precast tie beam cavity precast section and within the closure range between the tie beam sections in the cast-in-place cofferdam; G. Pour the concrete for the tie beam closure section on the cast-in-place suspension frame of the closure section; H. Pour concrete into the cavity of the precast section of the tie beam. I. Once the concrete in the cavity of the tie beam closure section and the precast cavity section of the tie beam reaches the design strength, the cast-in-place hanger and cofferdam of the closure section are removed to obtain the deep-water large-span tie beam.

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