CN104964769A

CN104964769A - Concrete side pressure computing method

Info

Publication number: CN104964769A
Application number: CN201510472487.8A
Authority: CN
Inventors: 程慧林; 郭亚娟; 梁志新; 李大康; 罗九林; 李闻; 罗红春; 李力亨
Original assignee: China Railway Fifth Survey and Design Institute Group Co Ltd
Current assignee: China Railway Fifth Survey and Design Institute Group Co Ltd
Priority date: 2015-08-04
Filing date: 2015-08-04
Publication date: 2015-10-07

Abstract

The invention discloses a concrete side pressure computing method. According to the method, one or more of the factors of the concrete gravity density gamma, the concrete fluidity beta, the concrete molding temperature T, the initial setting time t0 of concrete, the pouring speed v of the concrete, the shape and size of a framework, the concrete discharging height, the concrete pouring height H and whether admixtures are blended into the concrete are considered, and any one or more factors of the concrete slump or the concrete internal friction angle and the concrete pouring height are further considered, so that a concrete side pressure computing formula is made to better accord with the actual conditions under the current construction conditions, and framework design is made to be safer and more reliable.

Description

A kind of concrete lateral pressure computing method

Technical field

To form lateral pressure computing method when the present invention relates to a kind of concreting, particularly relate to a kind of concrete lateral pressure computing method.

Background technology

The concrete design strength adopted now is general higher, generally all adopts multiple additive, and the concrete slump is comparatively large, and concreting is highly general comparatively large, many employings discharge pump conveying during construction.

Existing concrete mainly contains the factor considered in the lateral pressure formula of template: 1. concrete gravimetric density γ; 2. concrete flowability β; 3. concrete molding temperature T; 4. concrete presetting period t ₀; 5. concrete speed of perfusion v; 6. shape of template size; 7. pouring out concrete height; 8. concreting height H; 9. whether additive is mixed with.For above parameter, some is embodied in the coefficient of formula, as concrete flowability and admixture dosage, and be generally concrete molding temperature T and concrete speed of perfusion v or concrete presetting period t as the parameter that independent variable participates in formulae discovery directly ₀with concrete speed of perfusion v.These formula are matchings when former concrete slump is less, many employings hopper is built.

Calculate generally less than normal for the concrete lateral pressure under condition now, former formula does not consider the concrete slump and concreting height, needs to rethink these two factors and the concrete lateral pressure formula of matching now under condition again.

Summary of the invention

The object of this invention is to provide a kind of safer reliable concrete lateral pressure computing method.

The object of the invention is to be achieved through the following technical solutions:

Concrete lateral pressure computing method of the present invention, that considers in following factor is one or more: concrete gravimetric density γ; Concrete flowability β; Concrete molding temperature T; Concrete presetting period t ₀; Concrete speed of perfusion v; Shape of template size; Pouring out concrete height; Concreting height H; Whether be mixed with additive, also consider following any one or multiple factor:

Concrete slump or concrete angle of internal friction; Concreting height.

As seen from the above technical solution provided by the invention, the concrete lateral pressure computing method that the embodiment of the present invention provides, owing to considering concrete slump or concrete angle of internal friction, concreting material impact highly, or comprise the impact of one of them principal element, the actual conditions under making the computing formula of concrete lateral pressure more meet execution conditions now.Adopt new concrete lateral pressure computing formula, make the design of template reliably safer.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of concrete slump conversion angle of internal friction in the embodiment of the present invention.

Embodiment

To be described in further detail the embodiment of the present invention below.

Concrete lateral pressure computing method of the present invention, its preferably embodiment be:

That considers in following factor is one or more: concrete gravimetric density γ; Concrete flowability β; Concrete molding temperature T; Concrete presetting period t ₀; Concrete speed of perfusion v; Shape of template size; Pouring out concrete height; Concreting height H; Whether be mixed with additive, also consider following any one or multiple factor:

Concrete slump or concrete angle of internal friction; Concreting height.

Adopt following any one or multiple formulae discovery concrete lateral pressure p:

Formula 1:

P = 3.6 \cdot γ \cdot K \cdot v^{1 / 4} \cdot t_{0}^{1 / 4}

Formula 2:

Formula 3:

Formula 4:

Formula 5:

\{\begin{matrix} P = 0.8 \cdot γ \cdot K \cdot v^{\frac{1}{4}} \cdot t_{0} & t_{0} \leq 5 \\ P = 0.56 \cdot γ \cdot K \cdot v^{\frac{1}{4}} (t_{0} + 2) & 5 < t_{0} \leq 10 \\ P = 0.42 \cdot γ \cdot K \cdot v^{\frac{1}{4}} (t_{0} + 6) & 10 < t_{0} \leq 15 \end{matrix}

In above formula:

γ is concrete gravimetric density, and v is concreting speed, t ₀for the concrete presetting period, K is slump influence coefficient, and Φ is concrete angle of internal friction, and H is concrete building highly.

The concrete slump and concrete build height for wall pressure impact comparatively large, when the slump is large, concrete wall pressure is large; When concreting is highly large, concrete wall pressure is large.Concrete slump adopts concrete angle of internal friction in a free state to represent.The equivalent circular tang formed when concrete angle of internal friction can adopt concrete slump to test converts according to constancy of volume.Concrete wall pressure formula is except considering 1. concrete gravimetric density γ; 2. concrete flowability β; 3. concrete molding temperature T; 4. concrete presetting period t ₀; 5. concrete speed of perfusion v; 6. shape of template size; 7. pouring out concrete height; 8. concreting height H; Whether be 9. mixed with outside the one or more principal elements in additive etc., the application goes back emphasis and considers concrete angle of internal friction and concretely build height.

Specific embodiment:

Be below several embodiments of concrete lateral pressure formula, wherein γ is concrete gravimetric density, and v is concreting speed, t ₀for the concrete presetting period, K is slump influence coefficient, and Φ is concrete angle of internal friction, H be concrete build height, as shown in Figure 1.

Formula 1 slump coefficient---speed of perfusion---presetting period

P = 3.6 \cdot γ \cdot K \cdot v^{1 / 4} \cdot t_{0}^{1 / 4}

Formula 2 angle of friction---build height

Formula 3 angle of friction---speed of perfusion---presetting period

Formula 4 angle of friction---builds height---presetting period

Formula 5 segmentation formula, carries out segmentation according to the presetting period

\{\begin{matrix} P = 0.8 \cdot γ \cdot K \cdot v^{\frac{1}{4}} \cdot t_{0} & t_{0} \leq 5 \\ P = 0.56 \cdot γ \cdot K \cdot v^{\frac{1}{4}} (t_{0} + 2) & 5 < t_{0} \leq 10 \\ P = 0.42 \cdot γ \cdot K \cdot v^{\frac{1}{4}} (t_{0} + 6) & 10 < t_{0} \leq 15 \end{matrix}

These are only several embodiments of concrete lateral pressure formula, comprise and be not limited to these formula.It is characterized in that containing the material impact of 1. concrete slump or concrete angle of internal friction, 2. concreting height,

Concrete lateral pressure formula of the present invention contains concrete slump or concrete angle of internal friction, concreting material impact highly, or comprise the impact of one of them principal element, the actual conditions under making the computing formula of concrete lateral pressure more meet execution conditions now.Adopt new concrete lateral pressure computing formula, make the design of template reliably safer.

The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.

Claims

1. concrete lateral pressure computing method, that considers in following factor is one or more: concrete gravimetric density γ; Concrete flowability β; Concrete molding temperature T; Concrete presetting period t ₀; Concrete speed of perfusion v; Shape of template size; Pouring out concrete height; Concreting height H; Whether be mixed with additive, it is characterized in that, also consider following any one or multiple factor:

Concrete slump or concrete angle of internal friction; Concreting height.

2. concrete lateral pressure computing method according to claim 1, is characterized in that, adopt following any one or multiple formulae discovery concrete lateral pressure p:

Formula 1:

P = 3.6 \cdot γ \cdot K \cdot v^{1 / 4} \cdot t_{0}^{1 / 4}

Formula 2:

Formula 3:

Formula 4:

Formula 5:

\{\begin{matrix} P = 0.8 \cdot γ \cdot K \cdot v^{\frac{1}{4}} \cdot t_{0} & t_{0} \leq 5 \\ P = 0.56 \cdot γ \cdot K \cdot v^{\frac{1}{4}} (t_{0} + 2) & 5 < t_{0} \leq 10 \\ P = 0.42 \cdot γ \cdot K \cdot v^{\frac{1}{4}} (t_{0} + 6) & 10 < t_{0} \leq 15 \end{matrix}

In above formula: