CN102628309A - Construction method of concrete corner stairs - Google Patents

Abstract

The invention provides a construction method of concrete corner stairs. The method comprises the following steps: (1) pre-anchoring a first upper reinforcing steel bar (1) and a first lower reinforcing steel bar (2) into an upper support, and pre-anchoring a second upper reinforcing steel bar (3) and a second lower reinforcing steel bar (4) into a lower support; and (2) connecting the first upper reinforcing steel bar (1), which is positioned at the upper part of a stair at the upper support, with the second upper reinforcing steel bar (3), which is positioned at the lower support, by a first reinforcing steel bar (5); and connecting the first lower reinforcing steel bar (2) of the stair at the upper support with the second lower reinforcing steel bar (4) in the lower support by a second reinforcing steel bar (6).

Description

The job practices of a kind of concrete turning stair

Technical field

The present invention relates to the construction technology of concrete turning stair.

Background technology

Traditional turning stair are provided with concrete column or steel column usually around the corner, though spiral stairs has been considered the space mechanics performance, on your opinion is economical and attractive in appearance good effect are arranged all, receive the restriction in place easily.Continue to adopt traditional turning stair.To exist following deficiency:

1, mechanical model is complicated when calculating, dyscalculia

Though it is clearer and more definite that 2 mechanics are uploaded force rate, not enough economy and beautiful appearance

Summary of the invention

The job practices that the purpose of this invention is to provide a kind of concrete turning stair.

The present invention is the job practices of a kind of concrete turning stair, the steps include:

(1) anchors into first upper reinforcement 1 and first lower rebar 2 in advance at the upper seat place, anchor in advance on second upper reinforcement 3 and second lower rebar 4 at the lower seat place;

(2) first upper reinforcement 1 on the stair top at upper seat place links to each other with second upper reinforcement 3 at lower seat place through first reinforcing bar 5, and first lower rebar 2 of the stair at upper seat place links to each other with second lower rebar 4 at lower seat place through second reinforcing bar 6.

The invention has the beneficial effects as follows: described concrete turning stair, it has solved the stressed complicacy of traditional turning stair through unique structural property, is difficult to calculate the problem of not enough economy and beautiful appearance.The colleague has solved spiral stairs lets you receive the problem of place restriction easily.This turning stair economy and beautiful appearance is convenient to calculate, and is not received the restriction in place.

Description of drawings

Fig. 1 is the arrangement of reinforcement that coagulation is carried the turning stair, and Fig. 2 is the calculation diagram that coagulation is carried the turning stair.

Concrete implementation

As shown in Figure 1, the present invention is the job practices of a kind of concrete turning stair, the steps include:

(1) anchors into first upper reinforcement 1 and first lower rebar 2 in advance at the upper seat place, anchor in advance on second upper reinforcement 3 and second lower rebar 4 at the lower seat place;

(2) first upper reinforcement 1 on the stair top at upper seat place links to each other with second upper reinforcement 3 at lower seat place through first reinforcing bar 5, and first lower rebar 2 of the stair at upper seat place links to each other with second lower rebar 4 at lower seat place through second reinforcing bar 6.

Like Fig. 1, shown in Figure 2, the diameter that the diameter of first upper reinforcement 1 that anchors in advance at upper seat place is not less than first reinforcing bar, 5, the first lower rebar 2 is not less than the diameter of second reinforcing bar 6, and it is fixed that its value is got through calculating, and design formulas is following:

$M={\mathrm{<figure-callout\; id="2"\; label="l"\; filenames="HSA00000571472200011.png"\; state="\{\{state\}\}">l</figure-callout>}}_2\&times;q{l}_{1}b+{\&Integral;}_0^{\frac{\mathrm{\&pi;}}{2}}({\mathrm{<figure-callout\; id="3"\; label="l"\; filenames="HSA00000571472200011.png"\; state="\{\{state\}\}">l</figure-callout>}}_3+R\sin \mathrm{\&phi;})\mathrm{qRd\&phi;}+\frac{1}{2}\&times;{\mathrm{<figure-callout\; id="3"\; label="ql"\; filenames="HSA00000571472200011.png"\; state="\{\{state\}\}">ql</figure-callout>}}_3^2-l_1{R}_b$

In the formula: $A_s=\frac{M}{f_y^T{\mathrm{\&gamma;}}_s{h}_0}$

${\mathrm{\&gamma;}}_s=0.5[1+\sqrt{(1-2{\mathrm{\&alpha;}}_s)}]$

${\mathrm{\&alpha;}}_s=\frac{M}{{\mathrm{\&alpha;}}_1{f}_c^{T}b{h}_0^2}$

A _sThe section area of-tensile region longitudinal reinforcement; M-moment of flexure design load;

Tensile strength of reinforcement design load under -temperature action;

γ _sArm of force coefficient in the-interface; α _s-interface resistance moment coefficient;

The b-breadth of section; h ₀-effective depth of section;

Concrete crushing strength design load under

-temperature action;

R _b＝3/8ql。

Claims (2)

1. the job practices of concrete turning stair the steps include:

(1) anchors into first upper reinforcement (1) and first lower rebar (2) in advance at the upper seat place, anchor in advance on second upper reinforcement (3) and second lower rebar (4) at the lower seat place;

(2) first upper reinforcement (1) on the stair top at upper seat place links to each other with second upper reinforcement (3) at lower seat place through first reinforcing bar (5), and first lower rebar (2) of the stair at upper seat place links to each other with second lower rebar (4) at lower seat place through second reinforcing bar (6).

2. the job practices of concrete according to claim 1 turning stair; It is characterized in that: the diameter of first upper reinforcement (1) that anchors in advance at upper seat place is not less than first reinforcing bar (5); The diameter of first lower rebar (2) is not less than the diameter of second reinforcing bar (6); It is fixed that its value is got through calculating, and design formulas is following:

$M=l_2\&times;q{l}_{1}b+{\&Integral;}_0^{\frac{\mathrm{\&pi;}}{2}}(l_3+R\sin \mathrm{\&phi;})\mathrm{qRd\&phi;}+\frac{1}{2}\&times;{\mathrm{ql}}_3^2-l_1{R}_b$

In the formula: $A_s=\frac{M}{f_y^T{\mathrm{\&gamma;}}_s{h}_0}$

${\mathrm{\&gamma;}}_s=0.5[1+\sqrt{(1-2{\mathrm{\&alpha;}}_s)}]$

${\mathrm{\&alpha;}}_s=\frac{M}{{\mathrm{\&alpha;}}_1{f}_c^{T}b{h}_0^2}$

A _sThe section area of-tensile region longitudinal reinforcement; M-moment of flexure design load;

Tensile strength of reinforcement design load under

-temperature action;

γ _sArm of force coefficient in the-interface; α _s-interface resistance moment coefficient;

The b-breadth of section; h ₀-effective depth of section;

Concrete crushing strength design load under

-temperature action;

R _b＝3/8ql。

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