CN203361183U - Power transmission tower foundation - Google Patents

Abstract

The utility model discloses a power transmission tower foundation. The power transmission tower foundation comprises an inclined upright post and a concrete step buried below design ground, wherein the inclined upright post is fixed on the concrete step; the slopes of the inclined upright post on the X axis and the Y axis are consistent with the slopes of a tower leg on the X axis and the Y axis; the center of the cross section of the bottom of the inclined upright post is overlapped with the center of the cross section of the concrete step; the inclined upright post is connected with the tower leg through angle steel or a foundation bolt; the inclined upright post comprises a plurality of longitudinal stress reinforcing steel bars; the longitudinal stress reinforcing steel bars are connected with stirrups; the longitudinal stress reinforcing steel bars and the stirrups are fixed by concrete. The power transmission power foundation has the beneficial effects that the using amounts of foundation concrete steps and reinforcing steel bars are saved to the maximum, and the construction cost is saved on the premise that the requirement on foundation bearing force is met.

Description

A kind of power transmission tower basis

Technical field

The utility model relates to and belongs to high pressure, super-pressure, UHV transmission line pole and tower foundation field, relates in particular to a kind of power transmission tower basis.

Background technology

At present, domestic field of overhead power transmission lines, digging up and filling in class basis pattern is more, mainly contains: right cylinder footing foundation, right cylinder slab foundation, batter post slab foundation, gravity type foundation and large slab foundation etc.Wherein the right cylinder footing foundation is one of basic pattern be most widely used in work transmission line, and its scope of application relates to each electric pressure.The right cylinder footing foundation adopts the vertical type principal post, and base plate is comprised of a plurality of plain concrete steps, and construction technology is simple, is easy to ensure the quality of products.Because concrete gravity proportion when resisting uplift force is larger, resistance to capsizing is strong, is applicable to take the overturning or slip resistance analysis moment of flexure as main tower position.But because basic principal post is the vertical type setting, superstructure reaches basic external load and produces larger horizontal shear at the place, ground, makes whole basis bear larger moment of flexure, causes the foundation main column section large, and in post, the arrangement of reinforcement consumption is many.Existence due to place, ground horizontal shear, also make sole plate bear X, Y-axis biaxial bending, causes footing step quantity more, and the underplate concrete consumption is huge to be increased, thereby has strengthened the basic material consumption, has increased engineering cost and operating expenses.

The utility model content

The purpose of this utility model is the deficiency that overcomes existing basic pattern, and a kind of power transmission tower basis is provided, and under the prerequisite that meets the foundation bearing capacity requirement, farthest saves the consumption of base concrete step and reinforcing bar, saves engineering cost and cost.

Above-mentioned purpose of the present utility model, can implement by the following technical programs:

A kind of power transmission tower basis, comprise: tiltedly column designs underground concrete step with being embedded in, described oblique column is fixed on concrete step, described concrete step cross section is square, described oblique column is consistent with tower leg X, the Y-axis gradient in the gradient of X, Y-axis, each step profile section center superposition of described center, oblique column bottom section and concrete, described oblique column is connected with tower leg by angle steel or stone bolt.

Described oblique column comprises some Reinforcements, and described Reinforcement is connected with stirrup, and described Reinforcement and stirrup are fixed by concrete.

Described concrete step comprises the step that some areas from top to bottom successively reduce.

Described oblique column cross-section is square or circular.

Concrete step of the present utility model, in upper shearing bearing capacity calculation while pulling out load action, is determined by following formula:

Pull out and shear bearing capacity calculation (being only applicable to square floor) in place, concrete step change rank:

V≤0.4A ₀f _t

Wherein: A ₀=(l ₁h ₁+ l ₂h ₂+ l ₃h ₃+ ... l _nh _n) L _wb

$L_{\mathrm{wb}}=\frac{l_1-0.59\left(\mathrm{\Δl}\right)}{l_1}$

In formula:

A ₀---the anti-shearing area of step while pulling out on basis, m ²;

L _wb---the area coefficient relevant with the footing step size;

L ₁, l ₂, l ₃, l _n---basis from bottom to top the 1st, 2,3, the width of a n step, m;

H ₁, h ₂, h ₃, h _n---basis from bottom to top the 1st, 2,3, the effective height of a n step, m;

F _t---concrete tensile strength design load, kN/m ²;

△ l---while checking the 1st step, get △ l=(l ₁-l ₂) * 0.5; While checking the 2nd step, get △ l=(l ₁-l ₃) * 0.5; By that analogy, m;

The shearing that V---footing step bears, kN.

Innovation of the present utility model:

1. the batter post footing foundation has changed basic power transmission process, and the downforce direct effect that it produces superstructure is to footing step;

2. oblique column and the same slope design of tower leg, make making a concerted effort and oblique column dead in line of the suffered vertical active force in basis and transverse and longitudinal horizontal force, and the horizontal force on oblique column is reduced greatly;

3. in the situation that the tower leg gradient is different, adopt the batter post footing foundation to make the horizontal force vertical with basic axis reduce more than 50%～80%, and tiltedly the axial basic role power of column only increases 1%～5%, thereby greatly improved the force-bearing situation of oblique column, concrete step, foundation level power is down to minimum on the impact of footing step, the stability on basis is significantly improved;

4. because eccentric bending moment reduces greatly, above pull out the stable footing step size of controlling and can obtain corresponding reducing, thereby reduced the consumption of base concrete and steel, saved engineering cost and cost.

The accompanying drawing explanation

Fig. 1 is the utility model square-section batter post footing foundation figure;

The top view that Fig. 2 is Fig. 1;

Fig. 3 is the utility model circular cross-section batter post footing foundation figure;

The top view that Fig. 4 is Fig. 3;

Wherein: 1, design ground, 2, oblique column, 3, Reinforcement, 4, stirrup, 5, concrete step.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.

As Figure 1-4, a kind of power transmission tower basis, comprise: tiltedly column designs 1 time, ground concrete step 5 with being embedded in, described oblique column 2 is fixed on concrete step 5, described concrete step 5 cross sections are square, described oblique column 2 is consistent with tower leg X, the Y-axis gradient in the gradient of X, Y-axis, and described oblique column 2 centers, bottom section overlap with concrete step 5 kernel of section, and described oblique column 2 is connected with tower leg by angle steel or stone bolt.

Described oblique column 2 comprises some Reinforcements 3, and described Reinforcement 3 is connected with stirrup 4, and described Reinforcement 3 and stirrup 4 are fixed by concrete.

Described concrete step 5 comprises the step that some areas from top to bottom successively reduce.

Described oblique column 2 cross sections are square or circular.

Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present utility model is described; but be not the restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.

Claims (5)

1. a power transmission tower basis, it is characterized in that, comprise: tiltedly column designs underground concrete step with being embedded in, described oblique column is fixed on concrete step, described oblique column is consistent with tower leg X, the Y-axis gradient in the gradient of X, Y-axis, each step profile section center superposition of described center, oblique column bottom section and concrete, described oblique column is connected with tower leg by angle steel or stone bolt.

2. a kind of power transmission tower as claimed in claim 1 basis, is characterized in that, described oblique column comprises some Reinforcements, and described Reinforcement is connected with stirrup, and described Reinforcement and stirrup are fixed by concrete.

3. a kind of power transmission tower as claimed in claim 1 basis, is characterized in that, described concrete step comprises the step that some areas from top to bottom successively reduce.

4. a kind of power transmission tower as claimed in claim 1 or 2 basis, is characterized in that, described oblique column cross-section is square or circular.

5. a kind of power transmission tower as described as claim 1 or 3 basis, is characterized in that, described concrete step cross section is square.

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