CN101191333A

CN101191333A - Overturn-resisting slipping-proof foundation

Info

Publication number: CN101191333A
Application number: CNA2006102011538A
Authority: CN
Inventors: 常建华
Original assignee: Guiyang Aluminum Magnesium Design and Research Institute Co Ltd
Current assignee: Guiyang Aluminum Magnesium Design and Research Institute Co Ltd
Priority date: 2006-11-28
Filing date: 2006-11-28
Publication date: 2008-06-04

Abstract

The invention discloses an overturning-proof and slippage-proof base with an inclined bottom surface of the base. The included angle of the bottom surface of the base and the horizontal direction is alpha, and the side surface of the base extending into the underground more is the force meeting surface; the bottom surface of the base is provided with a slippage-proof toe and the length direction of the slippage toe is perpendicular to the direction of a horizontal thrust of the top of the base, wherein, the range of the value of the included angle alpha is as follows: the tangent of alpha is equal to the ratio of 0.1 to 1 in the case of soil foundation; the tangent of alpha is equal to the ratio of 0.2 to 1 in the case of rock foundation. The width b and the height h of the slippage-proof toe are determined by calculation and the values of the width and the height should be able to meet the cutting-proof and bending resistance requirements at the interface of the bottom of the base; moreover, the value of b ranges from 0.15 B to 0.25 B, where B is the length of the bottom surface of the base; the value of h of the slippage-proof toe ranges from 250 millimeters to 450 millimeters; the length of the slippage-proof toe and the width H of the bottom surface of the base are in the same direction and the values of length and the width are the same. By changing the bottom surface of the base into the inclined type and further arranging the slippage-proof toe, the invention effectively increases the overturning-proof and slippage-proof abilities, thereby reducing the use level of the concrete of the base and lowering the construction cost.

Description

A kind of overturn-resisting slipping-proof foundation

Technical field:

The present invention relates to a kind of foundation structure of arch grid structure building.

Background technology:

In Building technology growing today, new building structure pattern continues to bring out.The arch grid structure structure of Chu Xianing in recent years, because its span is big, post can not established in inside, and quick construction and attracting tremendous attention, and is more and more used, but when adopting this kind structural shape, act on horizontal thrust on the basic end face also because of its architectural characteristic has strengthened much than traditional structure, for overturning or slip resistance analysis and the antiskid that guarantees the basis moves ability, the designer often can only strengthen the size on basis simply, thereby increase the basis deadweight, enough big to guarantee that its overturning or slip resistance analysis and antiskid move ability.Can deal with problems though do so also, increase the consumption of base concrete and steel virtually greatly, cause bigger waste economically.

Summary of the invention:

The technical problem to be solved in the present invention is: at traditional basic pattern solve basic overturning or slip resistance analysis and antiskid move aspect the deficiency of ability, the foundation structure that a kind of overturning or slip resistance analysis and antiskid move ability is proposed, overturning or slip resistance analysis and antiskid that this structure can effectively improve the basis move ability, reduce the consumption of base concrete, reduce building costs.

Structure of the present invention is such: foundation bed is for what tilt, and the angle of this foundation bed and horizontal direction is α, and basic in depth many down sides are for meeting the power face; Be provided with the antiskid toe at foundation bed, the length direction of antiskid toe is vertical with the direction of basic top horizontal thrust.

The value of angle α is: earthen foundation is tg α=0.1: 1; Rock foundation is tg α=0.2: 1.

H is definite by calculating for the width b of antiskid toe, height, and its value should be able to satisfy the requirement of the anti-shearing and bending resistance at substrate interface place.After satisfying these requirements, the span of b should satisfy 0.15B～0.25B, and B is a foundation bed length herein; Antiskid toe height h value should satisfy 250～450mm; The length of antiskid toe and foundation bed width H are in the same way and equate.

Mentality of designing of the present invention is described as follows:

For traditional plain base foundation structure, its foundation bed is a level, and effective overturning or slip resistance analysis moment of foundation bed is M1=G.x1, and wherein G is the basis deadweight, and x1 is the distance between basic center of gravity and basic angle point; If guaranteeing change foundation bed into inclined-plane, and the setting principle of foundation bed incline direction to be under the constant prerequisite of basic gross weight: the basis, back that will tilt is stretched into underground more side and is defined as meeting the power face.The said herein power of meeting face is exactly direct one side towards horizontal thrust.At this moment, effective overturning or slip resistance analysis moment on this basis is M2=G.x2, and wherein G is the basis deadweight, and x2 is the distance between basic center of gravity and basic angle point.Be not difficult to judge this moment, because foundation bed is tilted by the direction that helps increasing overturning or slip resistance analysis moment, the focus point on basis will resist a side of the square of going all out to be moved to helping increasing, be x2＞x1, under the prerequisite that basic gross weight G remains unchanged, obviously can draw the conclusion of M2＞M1, in other words, under the certain situation of building horizontal thrust, adopt this method just can effectively improve the anti-ability of inclining in basis.

Foundation bed is being changed into the inclination pattern with when increasing its resistance to capsizing, the antiskid that also should increase the basis moves ability.For traditional plain base foundation structure, its foundation bed is a level, and the effective anti-skid force on this basis is G. μ, and wherein G is the basis deadweight, and μ is the friction factor of foundation bed soil and foundation bed; And the skid force on basis is Eat.The antiskid that can draw this moment basis according to national regulation moves stability and is: G. μ/Eat, it is good more that the antiskid that its ratio is big more then to show the basis moves ability.To increase the purpose that antiskid moves ability in order reaching, two kinds of approach to be arranged usually, first kind is to strengthen the value that basic deadweight promptly increases G. μ, and second kind is to manage to reduce the value that horizontal thrust promptly reduces Eat.But for a design, the horizontal thrust that acts on the basis is certain, can bear this thrust in order to make structure, can only reduce its phorogenesis to the basis by increase a horizontal force opposite with the horizontal thrust action direction on the basis.If guaranteeing under the constant prerequisite of basic gross weight, set up an antiskid toe at foundation bed, at this moment, the effective anti-skid force on this basis is G. μ still, and setting up foundation bed soil behind the antiskid toe, will to produce a power opposite with basic top horizontal thrust to the antiskid toe be P, at this moment the Eat-P that makes a concerted effort to become of horizontal thrust, the antiskid on basis moves stability and becomes: G. μ/(Eat-P), obviously, reduce, and the antiskid ability of moving on basis significantly improves as the horizontal thrust of denominator.

The invention has the beneficial effects as follows: by foundation bed being changed into the tilting structure and setting up the antiskid toe, the overturning or slip resistance analysis and the antiskid that can effectively increase the basis move ability, thereby have reduced the base concrete consumption, compare with conventional method, and be reasonable more economically.

Description of drawings:

Fig. 1 is traditional plain base foundation structure schematic diagram;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is a structural representation of the present invention;

Fig. 4 is the vertical view of Fig. 3.

The specific embodiment:

Embodiments of the invention: overturning or slip resistance analysis and the antiskid of adopting structure of the present invention to improve the basis move ability, carry out as follows:

The first, act on horizontal thrust and other every internal force index of basic end face by calculating of superstructure, as bending moment, axle power etc.;

The second, with the existing horizontal thrust of first step and other internal force index, according to the basic pattern of tradition the basis is carried out overturning or slip resistance analysis and antiskid respectively earlier and move design, draw and satisfy overturning or slip resistance analysis simultaneously and antiskid moves the corresponding length in basis of requirement;

The 3rd, this basis is carried out overturning or slip resistance analysis and antiskid respectively move optimal design, be about to change the inclination pattern into and set up the antiskid toe by the foundation bottom of determining in above-mentioned second step; Wherein, the principle that should follow of incline direction is: the basis, back that will tilt is stretched into underground more side and is defined as meeting the power face; The length direction of antiskid toe is vertical with the direction of basic top horizontal thrust.The size of antiskid toe is definite by calculating, and its value should be able to satisfy the anti-shearing and bending resistance at opposing and substrate interface place.After satisfying these requirements, the span of width b should satisfy 0.15B～0.25B; Height h value should satisfy 250～450mm; Its length and foundation bed width H are in the same way and equivalent.

The 4th, move after optimal design changes substrate the inclination pattern into and set up the antiskid toe by overturning or slip resistance analysis and antiskid, the overturning or slip resistance analysis on basis and antiskid move ability and strengthen, can suitably reduce the appearance and size on basis this moment, and by repeatedly basic overturning or slip resistance analysis and antiskid move tentative calculation, draw the basic engineering size of an optimum, after this size should guarantee that the basis changes wedged bottom into and sets up the antiskid toe, its overturning or slip resistance analysis and the antiskid ability of moving satisfied the every requirement in the national regulation.

Claims

1. overturn-resisting slipping-proof foundation is characterized in that: foundation bed is for what tilt, and the angle of this foundation bed and horizontal direction is α, the basis in depth down side how for meeting the power face; Be provided with the antiskid toe at foundation bed, the length direction of antiskid toe is vertical with the direction of basic top horizontal thrust.

2. overturn-resisting slipping-proof foundation according to claim 1 is characterized in that: the value of angle α is: earthen foundation is tg α=0.1: 1.

3. overturn-resisting slipping-proof foundation according to claim 1 is characterized in that: the value of angle α is: rock foundation is tg α=0.2: 1.

4. overturn-resisting slipping-proof foundation according to claim 1 is characterized in that: the value of antiskid toe width b is 0.15B～0.25B, and B is a foundation bed length.

5. overturn-resisting slipping-proof foundation according to claim 1 is characterized in that: the value of antiskid toe height h is 250～450mm.

6. overturn-resisting slipping-proof foundation according to claim 1 is characterized in that: antiskid toe length and foundation bed width H are in the same way and equivalent.