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A Practical Calculation Method of Load-bearing Support of Concrete Cast-in-situ Box Girder

A practical calculation and concrete technology, which is applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., can solve the problems of reducing the safety reserve of load-bearing support projects, increasing construction safety risks, and being unable to accurately calculate the layout form, etc.

Active Publication Date: 2020-06-30
JSTI GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The above-mentioned calculation method for the self-weight of the concrete and formwork of the load-bearing support can only roughly estimate the calculated value of the self-weight of the concrete and formwork in the design value of the axial force of a single vertical rod of the load-bearing support, and cannot accurately calculate according to the type of support support and the layout of the support structure
This can cause the actual axial force of the support to be greater than its ultimate bearing capacity, reducing the safety reserve of the load-bearing support project and increasing its construction safety risk

Method used

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  • A Practical Calculation Method of Load-bearing Support of Concrete Cast-in-situ Box Girder
  • A Practical Calculation Method of Load-bearing Support of Concrete Cast-in-situ Box Girder
  • A Practical Calculation Method of Load-bearing Support of Concrete Cast-in-situ Box Girder

Examples

Experimental program
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Embodiment 1

[0042] A practical calculation method for the load-bearing bracket of a concrete cast-in-place box girder, comprising the following steps:

[0043] 1.1 Clarify the type of load-bearing bracket and the layout of the bracket structure;

[0044] 1.2 According to the clear results in step 1.1, select the appropriate calculation formula for calculation, and any calculation formula includes a reduction factor

[0045] In this example, the concrete and template self-weight of the cast-in-place box girder bottom plate, web plate and flange plate of the standard cross section are calculated, and the reduction factor Use fixed value, reduction factor in other cases It needs to be obtained through professional calculation;

[0046] 1.3 Calculate the self-weight of concrete and formwork in the design value of the axial force of the load-bearing bracket according to the parameter value results in step 1.2.

[0047] In this example, the cast-in-place box girder bottom plate, web plat...

Embodiment 2

[0059] A practical calculation method for the load-bearing bracket of a concrete cast-in-place box girder, comprising the following steps:

[0060] 1.1 Clarify the type of load-bearing bracket and the layout of the bracket structure;

[0061] 1.2 According to the clear results in step 1.1, select the appropriate calculation formula for calculation, and any calculation formula includes a reduction factor

[0062] In this example, the concrete and template self-weight of the cast-in-place box girder bottom plate, web plate and flange plate of the standard cross section are calculated, and the reduction factor Adopt fixed value;

[0063] 1.3 Calculate the self-weight of concrete and formwork in the design value of the axial force of the load-bearing bracket according to the parameter value results in step 1.2.

[0064] In this example, the cast-in-place box girder bottom plate, web plate and flange plate are all constructed with buckle brackets, and the reduction coefficient...

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Abstract

The invention provides a practical calculation method for the load-bearing bracket of a concrete cast-in-place box girder, comprising the following steps: specifying the type of the load-bearing bracket and the layout of the bracket structure; according to the clear result in step 1.1, selecting an appropriate calculation formula for calculation, and any calculation The reduction factor is included in the formula φ , where, when calculating the self-weight of the concrete and formwork of the cast-in-place box girder floor, web and flange of the standard cross-section, the reduction factor φ Use fixed value, reduction factor in other cases φ Obtained by professional calculation methods; according to the parameter value results in step 1.2, calculate the self-weight of concrete and formwork in the design value of the axial force of the load-bearing bracket. Through the technical solution in the invention, the calculation of the self-weight of concrete and formwork in the design value of the axial force of a single vertical pole is more accurate and reliable.

Description

technical field [0001] The invention relates to the field of engineering construction design of a load-bearing support, in particular to a practical calculation method for a load-bearing support of a concrete cast-in-place box girder. Background technique [0002] In the existing technology, the self-weight calculation of the load-bearing support concrete and formwork adopts the following method: [0003] N=Vρ [0004] [0005] In the formula: [0006] N—Calculated value of self-weight of cast-in-place box girder load-bearing support pole concrete and formwork; [0007] V—the projected reinforced concrete and formwork volume at the top of the load-bearing support pole; [0008] l x1 , l x2 —Space between the left and right poles of a single pole in the direction of the bridge; [0009] l y1 , l y2 — the distance between the front and rear poles of a single pole in the direction of the longitudinal bridge; [0010] H—converted height of projected concrete at the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/00
CPCE01D21/00
Inventor 刘朵冯晓楠张建东
Owner JSTI GRP CO LTD