CN202899156U

CN202899156U - Electric power circuit system

Info

Publication number: CN202899156U
Application number: CN 201220563152
Authority: CN
Inventors: 曹磊
Original assignee: CHANGZHOU SUWEN ELECTRIC ENERGY SCIENCE AND TECHNOLOGY Co Ltd
Current assignee: Suwen Electric Energy Technology Co ltd
Priority date: 2012-10-30
Filing date: 2012-10-30
Publication date: 2013-04-24
Anticipated expiration: 2022-10-30

Abstract

The utility model provides an electric power circuit system which comprises a steel tower base. The steel tower base comprises step-type foundation pillars and a base board. The step-type foundation pillars and the base board are used for supporting a steel tower. The step-type foundation pillars are placed on the base board. The step-type foundation pillars and the base board are integrally formed. According to the electric power circuit system, an existing split-step-type base is changed into integral pouring, the difficulty that base sinking appears in areas with poor geology is overcome, economical efficiency is greatly improved compared with a cast-in-place pile base, and the electric power circuit system is convenient to implement and simple in technology.

Description

The power circuit system

Technical field

The utility model relates to a kind of power circuit system.

Background technology

In the circuit engineering construction, the iron tower foundation type of service is to suit measures to local conditions, diversified, generally adopted the split footing foundation, run into relatively poor place, address, the step basis in the circuit emerged in operation sinkage in various degree, when this mainly is larger because of basic stress, the steel tower root is opened to be restricted with the step sole plate and is produced conflict, the area, alluvial plain substantially at topography and geomorphology particularly, earth bearing strength is less, and groundwater table is higher, the area of mud layer depth, large for the iron tower foundation bearing load, no matter be in the city, or in the farmland, countryside, iron tower foundation is to adopt bored pile foundation substantially, but the bored concrete pile foundation construction cost is high, and exploitativeness is also lower.

The utility model content

The technical problems to be solved in the utility model is: in order to solve the base form that does not have a kind of not only economy in the existing iron tower foundation but also can tackle relatively poor geology, the utility model provides a kind of power circuit system, and the form that adopts footing foundation to implement monobloc cast solves the problems referred to above.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of power circuit system, comprise iron tower foundation, described iron tower foundation comprises that described step pilum places on the base plate for the step pilum and the base plate that support steel tower, and described step pilum and base plate are one-body molded.

According to the quantity of steel tower column foot, described step pilum quantity is 4.

The beneficial effects of the utility model are, this power circuit system changes into existing split footing foundation integrated poured, both overcome the difficulty that occurs immerge in the relatively poor area of geology, improve a lot in economy than bored concrete pile foundation again, and implement conveniently, technique is simple.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the structural representation of the utility model power circuit system optimal embodiment.

Among the figure 1, the step pilum, 2, base plate.

The specific embodiment

By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, basic structure of the present utility model only is described in a schematic way, so it only show the formation relevant with the utility model.

As shown in Figure 1, the utility model provides a kind of power circuit system, comprise iron tower foundation, iron tower foundation comprises for the step pilum 1 and the base plate 2 that support steel tower, step pilum 1 places on the base plate 2, step pilum 1 is one-body molded with base plate 2, and according to the quantity of steel tower column foot, general step pilum 1 quantity is 4.

The concrete size of iron tower foundation needs to calculate according to the stressing conditions of steel tower.At first be that basic upper load and internal force calculate, the load of steel tower mainly contains the body of the tower wind load, wire acts on load and steel tower deadweight on the steel tower, and wherein the load and the steel tower deadweight that cause of wire is the following seven kinds of load situation that provide according to power specialty:

(1) installation situation I---conducting wire;

(2) installation situation II---lightning conducter is installed;

(3) normal condition I---maximum wind velocity;

(4) normal condition II---regelation;

(5) normal condition III---the lowest temperature;

(6) accident conditions I---disconnected wire;

(7) accident conditions II---disconnected lightning conducter.

When calculating internal force, more than seven kinds of load situation all carry out Load Combination with the steel tower deadweight.Because circuit has seven kinds of different Load Combinations in installation, operation, accident, Gu this will analyze comparison to the Load Combination of every kind of situation, carry out internal force by worst Load Combination and calculate.The internal force that the various Load Combinations of steel tower body of the tower produce all calculates by static method, and the internal force that load passes to basic end face has moment of flexure, horizontal force and vertical force, gets its maximum value as the design internal force on basis.

Iron tower foundation mainly bears uplift force, downforce and horizontal force, therefore, the design on basis at first will be carried out stability calculation, is used for determining the appearance and size on basis, and then the intensity of carrying out the basis calculates, and wherein the stability calculation on basis comprises: on pull out stable, press down stable and topple stable.In stability calculation, we only calculate topple stable.More shallow at relative depth of foundation, under the effect of the power of toppling, do not consider that generally basic moment keeps balance.

After the buried depth of commbined foundations and base plate 2 sizes were determined, we just calculated its overturning moment M, do the time spent in two-way overturning moment, can calculate respectively:

M = \frac{(Q_{f} + G_{0}) \times l}{2} &GreaterEqual; K_{2} S_{0}

Wherein

M---overturning moment,

Q _f---basis deadweight (kN),

G ₀---the gravity (kN) of soil directly over the foundation bed,

L---be parallel to the power S that topples ₀ Base plate 2 width (m) of direction,

K ₂---the buckling safety factor that topples on considering basis and base plate 2 during native gravity,

S ₀---the power of toppling.

When four angles of basic role power steel tower provided, the limit overturning moment that the basis can bear was calculated by following formula:

M = \frac{(Q_{f} + G_{0})}{2} &GreaterEqual; [\frac{ΣT (l + h_{c}) - 2 ΣH (h + h_{c}) - ΣN (l + L)}{2}]

Wherein

T---act on upper group power (kN) of step pilum 1 end face,

N---act on the downforce (kN) of step pilum 1 end face,

L---be parallel to the power S that topples ₀The distance (m) that direction step pilum is 1,

H---act on step pilum 1 end face and be parallel to the power S that topples ₀The design level power (kN) of direction,

H---the buried depth (m) on basis,

h _c---the height (m) of the above part in step pilum 1 ground,

L---be parallel to the width (m) of the power So direction sole plate 2 that topples.

Take above-mentioned foundation desirable embodiment of the present utility model as enlightenment, by above-mentioned description, the relevant staff can in the scope that does not depart from this utility model technological thought, carry out various change and modification fully.The technical scope of this utility model is not limited to the content on the manual, must determine its technical scope according to the claim scope.

Claims

1. power circuit system, comprise iron tower foundation, it is characterized in that: described iron tower foundation comprises that described step pilum (1) places on the base plate (2) for the step pilum (1) and the base plate (2) that support steel tower, and described step pilum (1) is one-body molded with base plate (2).

2. power circuit as claimed in claim 1 system, it is characterized in that: described step pilum (1) quantity is 4.