CN2056680U - Light optimization iron tower foundation - Google Patents

Abstract

The utility model relates to a light optimization iron tower foundation, in particular to an improved power transmission line iron tower foundation. Compared with the common foundations at home and abroad, the utility model has the advantages of material saving, simple manufacture and convenient transportation. The utility model comprises a foundation column composed of four columns of different length and a bottom plate, has reasonable stress, and can be applied to all spatial tower-shaped structures.

Description

Light optimization iron tower foundation

The utility model relates to a kind of iron tower foundation of improved power transmission sequence, promptly light-duty optimization iron tower foundation.It is applicable to the power transmission sequence engineering of various voltage levels.

In the prior art, the iron tower foundation that adopts in the power transmission sequence engineering is based on excavation type basically, is divided into system of giving and cast-in-place two big classes.Give system basis pattern such as Fig. 1 commonly used, Fig. 2, shown in Figure 3.The universal type on cast-in-place basis such as Fig. 4, shown in Figure 5.(among Fig. 1, Fig. 4, Fig. 5,1 is principal post; 2 for banketing; 3 is base plate.Among Fig. 2,1 is leading role's steel; 2 for banketing; 3 is base plate; 4 is oblique material.Among Fig. 3,1 is angle steel; 2 for banketing; 3 is the base plate bar.) in the above-mentioned basis, with the cast-in-situ steel reinforced concrete of falling T-shape basis shown in Figure 4 in each step voltage power transmission sequence, use the most general.External also commonly used as Fig. 2 and base form shown in Figure 5.

The imposed load of iron tower foundation is also acting on the horizontal force that numerical value is 0.1～0.2 times of its vertical load along line direction and horizontal line road direction except vertical load.And because the direction of wind load and accident broken string load is arbitrarily, therefore, the direction of foundation load to consider three-dimensional positive and negative two to, shown in Fig. 6 (a) and Fig. 6 (b).P is a downforce among the figure, and F is a uplift force, and Hy is a longitudinal horizontal force, and HX is a transverse horizontal power.

Because the influence of level two to power arranged, domestic inverse-T-shaped basis of extensively adopting at present as shown in Figure 4, to improve weight bearing power, doing the size that not only makes the basis like this needs to strengthen to the influence of power because of being subjected to level two, the also corresponding increase of steel on basis with concrete amount, yet the basis after strengthening, in the ordinary course of things, sizable a part of intensity is not brought into play its effect, this obviously is irrational, external general basis, the practice that its principal post gradient and iron tower main material gradient are consistent, can make the basis no longer bear that a part of horizontal force that is passed to the basis by iron tower main material, this basis than the present use of China is reasonably many.But the horizontal force that got off by the oblique material transmission of iron tower still will be born in this kind basis, and therefore causes the eccentric force structure, in order to strengthen the weight bearing power on this kind basis, need equally to increase key dimension, thereby also unreasonable.

Task of the present utility model is that a kind of improved iron tower foundation will be provided.In order to overcome the deficiency on above-mentioned all kinds of bases, in engineering practice, after having studied the stressing conditions of all kinds of iron tower foundations under various operating modes, find, the active force of last three directions in basis, though all will consider the positive and negative property of its direction, but also regular following, promptly when on the horizontal force direction that acts on simultaneously when the pulling out horizontal force direction of effect when pressing down always opposite, can not put upside down appearance mutually.Indivedual operating modes as the accident broken string, the situation that single horizontal force direction is put upside down occurs sometimes, but the vertical force (uplift force or downforce) of this moment is much smaller than its control operating mode.According to above-mentioned gained rule, iron tower foundation is designed to as shown in Figure 7 pattern.

Below with reference to Fig. 7 the utility model is described further.1 is pillar among the figure, and 2 is base for post, and 3 is base plate.

With reference to Fig. 7, the basis is that the fine steel rib concrete post of 150～200mm square (can increase and decrease according to the load size) and base plate and base for post are formed by four sections, capital and base center line skew △ value, the size of △ value decides according to pulling out operating mode on the maximum, its principle is under this operating mode, after making capital skew △ value, the suffered pulling force of four pillars is equal substantially, and power disposes the reinforcing bar of pillar in view of the above, and then carry out the strength accounting of other operating mode, show that according to experimental studies results such designing and calculating principle meets objective reality, in order to improve work efficiency,, finishes by designing and calculating work nationality but helping computer.

This basis with still adopt in China habitual stone bolt connected mode being connected of iron tower, like this, existing all kinds of iron tower drawing can not made an amendment, and requires also can not make change for get the raw materials ready program and construction precision of an existing cover basis processing, thereby has enlarged range of application of the present utility model.

Four root posts of the present utility model are when bearing load, and it is subjected to the force direction homogeneous phase with (all be pulling force or all be pressure), and numerical value equates (or approaching).Changed stressed the differing very greatly and the opposite situation of some basic stress direction of the interior each point of its column section of basis of present employing;

Column of the present utility model only is subjected to axial force, is not subjected to moment of flexure, and therefore, its section can be done lessly, makes full use of anti-the drawing of reinforcing bar and the withstand voltage characteristic of concrete;

Bottom surface of the present utility model foundation stress is more even, has cut down the ground maximum stress value, thereby under identical load situation, these basic overall dimensions can reduce; Be subjected to uplift force control place, suitably increase embedded depth of foundation, utilize the pulling test strength of soil as far as possible, also can reach the purpose that reduces the Foundation Design amount, as being example, under general geological conditions with tangent tower load of certain 500 KV, two kinds of general both at home and abroad basic patterns are done a comparison with the utility model, can find that the more domestic general iron tower foundation at present of the utility model can consume steel 43.8%, concrete 61.8% less; More external general iron tower foundation consumes steel 26.1% less, concrete 48.4%.

The utility model also can be used for tangent space pyramidal structures such as TV transmission tower, microwave transmission tower, water tower.

Preferred forms of the present utility model can realize like this, with reference to Fig. 7:

Four pillars on basis can section be that square reinforced concrete member of 150～200mm or suitable angle member are formed.Sole plate thickness generally can adopt 200mm.In order to solve the punching strength problem, a base for post can be established in the bottom of each pillar, and it highly is generally 300mm, width 600mm square (size all can suitably increase and decrease according to the load size).Better regional in geology, base plate also can be divided into four fritters with the concrete consumption of further minimizing.The deviant of capital and base center line, its △ x and △ y are 200～600mm; The general desirable 2500～3500mm of the buried depth H on basis; Sole plate is thick to be about 200mm, and length of side A is 1400～3400mm.Above-mentioned size is looked concrete engineering and can suitably be increased and decreased.The column cap on basis can design like this that (with reference to Fig. 8,1 is stone bolt among the figure; 5 is stirrup; 6 is reinforcing bar; 7 is concrete cover; 8 for connecting steel plate; 9 is connecting bolt; 1 is pillar): can find its width to equal the cross section that iron tower stone bolt root is opened on the top of basic column; it links to each other with the mid point of this column top stone bolt separately with the intersection point of four pillar center lines; each face of formed like this parallelepiped adds required thickness of concrete cover respectively; and, promptly form the height and the width of capital parallelepiped connector with its modularization.

Claims (4)

1, a kind of light-duty optimization iron tower foundation is characterized in that this basis is made of four basic column and base plates that do not wait long struts to form.

2, light-duty optimization iron tower foundation according to claim 1 is characterized in that four pillars are that square reinforced concrete member of 150～200mm or suitable steel rod elements are formed by section.

3, light-duty optimization iron tower foundation according to claim 1 is characterized in that capital and base center line skew △ value, and its △ X and △ y are 200～600mm.

4, light-duty optimization iron tower foundation according to claim 1 is characterized in that the column cap on basis is an oblique parallelepiped structure, links to each other with iron tower with stone bolt.

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