CN201420268Y

CN201420268Y - Precast assembly type foundation

Info

Publication number: CN201420268Y
Application number: CN2009200810944U
Authority: CN
Inventors: 段蜀冰; 王雪野; 梁平; 管顺清; 胡志义
Original assignee: SICHUAN ENGINEERING CONSTRUCTION DEPARTMENT STATE GRID HVDC ENGINEERING CONSTRUCTION Co Ltd
Current assignee: SICHUAN ENGINEERING CONSTRUCTION DEPARTMENT STATE GRID HVDC ENGINEERING CONSTRUCTION Co Ltd
Priority date: 2009-05-22
Filing date: 2009-05-22
Publication date: 2010-03-10
Anticipated expiration: 2019-05-22

Abstract

The utility model relates to a concrete product, particularly to a precast assembly type foundation solving the foundation problem of networking power transmission projects in the high and cold areasof frozen soil in Qinghai and Tibet. The precast assembly type foundation consists of posts (1), bottom plates (2), an anchor floor beam (3), flange bolts (4), steel channels (5) and anchor bolts (6).The posts (1) and the bottom plates (2) are respectively provided with flange holes. The posts (1) are completely connected with the bottom plates (2) by the flange bolts (4) through the flange holeson the posts (1) and the bottom plates (2). The anchor bolts (6) are arranged on the anchor floor beam (3). The left and the right bottom plates (2) are connected into a whole body by the steel channels (5). The whole body of the bottom plates (2) is connected with the anchor floor beam (3) by the anchor bolts (6). The precast component is made from C40 concrete.

Description

Prefabricated assembled basis

Technical field

The utility model relates to concrete product, mainly is to solve the prefabricated assembled basis of networking power transmission engineering in Qinghai-Tibet at the underlying issue in high alpine frost soil location.

Background technology

Qinghai～Tibet ± 500kV dc online work transmission line, circuit institute is very abominable through regional natural conditions, will pass through height above sea level 3800-5000 rice, be about 700 kilometers continuous distributed ever-frozen ground districts (Qinghai-Tibet Platean).Frozen soil along the line has three types on distribution characteristics: seasonal frozen ground, the discontinuous ever-frozen ground of island and sheet be frozen soil for years.

Frozen soil is a kind of special soil body, and its composition, structure, hot physics and physico-mechanical properties have the many characteristics that are different from general soil.All taking place seasonal melt and freeze every year in the mobile layer in frozen soil area, so frozen soil stability extreme difference, and skewness, and frost-heave force is strong, and the thaw collapse degree of depth is big, line tower foundation is produced the disease of frost heave and thaw collapse.

Qinghai-Tibet ± about the 1130km of 400kV DC networking project total length, expectation iron tower 2825 bases.Wherein the most difficult location is about 500 kilometers from mountain pass, the Kunlun to Danggula Mountains mouth section, 4776 meters of mountain pass, the Kunlun height above sea level, 5231 meters of Danggula Mountains mouth height above sea level, and about 4800 meters of this section mean sea level is long-term frozen soil location, this iron leg tower is estimated 1250 bases.This section is positioned at nature protection area, HOh Xil environmental protection requirement height, and is scarcely populated, execution conditions are exceedingly odious, and construction quality, construction safety are least easy to control, and the basic pattern of this section should have specific aim, adopt particular design.

Particular surroundings characteristics according to this engineering, for implementing the spirit that State Grid Corporation of China's amphitypy one is changed, satisfy the duration of a project requirement, guarantee that the concrete quality of winter construction, the on-the-spot manual work amount of minimizing are beneficial to the personnel health, improve efficiency of construction, how to reduce disturbance to frozen soil, guarantee the stable of construction area frozen soil environment, to reduce and to avoid of the influence of frozen soil frost heave thaw collapse disease to the transmission line of electricity basis, guaranteeing that line tower foundation is stable, safety, is to build, design, construct to pay much attention to and to need the key subject of solution.

3.1 frozen soil influence

Because frozen soil is grown along the line, can form seasonal freezing and melt phenomenon with seasonal variations, to freeze soil layer winter and become hard, summer, the thawing of top layer 2.0～3.0m scope seriously, easily formed the marsh.

Therefore construction foundation pit easily is shaped under the frozen state in the winter time, mechanized equipment can march into the arena construction to reduce artificial input, little to environmental disruption; Construction foundation pit is easily caved under the summer melting state, mechanized equipment can not be marched into the arena, big to environmental disruption.

3.2 low temperature effect

Carry out concrete construction in the winter time, need materials such as sand, stone, water, cement all need heat, concrete curing need take warming measure guaranteeing concrete solidifying, so carries out that concrete pouring is not only long in time limit, quality is difficult for guaranteeing winter but also also big to environment damage.

Summary of the invention

The purpose of this utility model is, a kind of novel foundation of invention mainly reaches following purpose in Qinghai～Tibet ± 500kV DC networking project: 1, can better solve high and cold this global problem of frozen soil environment foundation construction, reduce artificial disturbance to greatest extent to frozen soil, keep frozen soil stable, avoid or alleviate the disease of basic frost heave thaw collapse; 2, can improve the mechanized construction level, reduce constructor's labour intensity greatly; 3, can solve Qinghai-Tibet Foundation Design (cold conditions) difficult problem that can't carry out concreting in the winter time, make basic engineering construction to carry out under the frozen soil frozen state, be to guarantee the duration, improves engineering construction standard and quality and lay the foundation; 4, Foundation Design construction in the winter time can make transport of materials, vehicle come in and go out and carry out under the frozen state of the face of land, thereby can make the disturbance of Construction on Environment, the destruction of surface vegetation drop to minimum.

The technical solution of the utility model is as follows:

Prefabricated assembled basis, constitute with crab-bolt with grade beam, flange plate bolt, channel-section steel, anchoring by column, base plate, anchoring, column and base plate are respectively arranged with the flange hole, flange plate bolt connects into integral body to column and base plate by the flange hole on column and the base plate, anchoring is arranged at anchoring with on the grade beam with crab-bolt, base plate left and right sides two parts connect into integral body by channel-section steel, and base plate integral body is connected with grade beam with anchoring with crab-bolt by anchoring.

The prefabricated component strength grade of concrete adopts the C40 concrete.

Good effect of the present utility model shows: product well solves the construction problem on high height above sea level, high and cold, basis, frozen soil location; filled up domestic blank, satisfied the engineering construction needs, had positive meaning ensureing engineering construction quality, protection altitude environment.

Description of drawings

Fig. 1 is the utility model facade structures schematic diagram;

Fig. 2 is the utility model plan structure schematic diagram.

Fig. 3 is that the utility model is in cross-sectional view.

Wherein, 1---------anchoring is with grade beam, 4---flange plate bolt, 5---channel-section steel, 6---anchoring crab-bolt for base plate, 3 for column, 2.

The specific embodiment

The utility model is described in further detail below in conjunction with specific embodiment and Figure of description.

The prefabricated component strength grade of concrete adopts the C40 concrete.

Good effect of the present utility model shows: product well solves high height above sea level, high and cold, Frozen earth section The construction problem on basis has been filled up domestic blank, has satisfied the engineering construction needs, to ensureing engineering construction matter Amount, protection altitude environment have positive meaning.

Claims

1, prefabricated assembled basis, by column (1), base plate (2), anchoring grade beam (3), flange plate bolt (4), channel-section steel (5), anchoring constitutes with crab-bolt (6), it is characterized in that: described column (1) is respectively arranged with the flange hole with base plate (2), flange plate bolt (4) connects into integral body to column (1) and base plate (2) by the flange hole on column (1) and the base plate (2), anchoring is arranged at anchoring with on the grade beam (3) with crab-bolt (6), base plate (2) left and right sides two parts connect into integral body by channel-section steel (5), and base plate (2) is whole to be connected with grade beam (3) with anchoring with crab-bolt (6) by anchoring.

2, prefabricated assembled basis according to claim 1 is characterized in that: described prefabricated component strength grade of concrete adopts the C40 concrete.