CN212295804U

CN212295804U - 66-220 kv consolidation power transformation framework without end support

Info

Publication number: CN212295804U
Application number: CN202021097707.6U
Authority: CN
Inventors: 王海民; 范雨松; 陈曦; 陈影; 刘力; 朱凯
Original assignee: Dalian Electric Power Survey & Design Institute Co ltd
Current assignee: Dalian Electric Power Survey & Design Institute Co ltd
Priority date: 2020-06-15
Filing date: 2020-06-15
Publication date: 2021-01-05
Anticipated expiration: 2030-06-15

Abstract

The utility model belongs to the field of electric power framework design, in particular to a 66-220 kv consolidation power transformation framework without an end support, which comprises a beam and a plurality of herringbone columns for supporting the beam; the cross beam is in a hollow design, the column heads of the herringbone columns are fixedly connected with the cross beam, and the adjacent herringbone columns form a span; the beam is provided with temperature expansion joints at the length of 3-6 spans, and the expansion joints are provided with a connecting insertion pipe. The cross beam is divided into an inter-column cross beam and a column head cross beam, the head end of each herringbone column is supported with the column head cross beam, two ends of the cross beam are respectively provided with a flange, two ends of the inter-column cross beam are respectively correspondingly connected with a flange plate, and the inter-column cross beam is fixed on the herringbone columns at the two ends through flange connection.

Description

66-220 kv consolidation power transformation framework without end support

Technical Field

The utility model belongs to an electric power framework design field specifically is a do not take end to prop concreties calculation method of transformer framework.

Background

Due to the development of a power grid, the electric wiring form and equipment of a power transformation project are required to be compactly arranged, the combined arrangement of the frameworks is a design which is concerned, at present, the 66kV double-layer frameworks, the 110kV frameworks and the 220kV frameworks in China all adopt a form that the two ends of the frameworks are provided with end supports, when the electric equipment is arranged, the positions of the frameworks must be avoided, the arrangement of the electric equipment is not flexible enough, and due to the support, the framework mechanism is single, so that the framework of the power transformation substation is not beautiful enough and wastes steel resources.

SUMMERY OF THE UTILITY MODEL

In order to solve one of the problems, the utility model provides a 66-220 kv consolidation power transformation framework without an end support, which comprises a cross beam and a plurality of herringbone columns for supporting the cross beam; the cross beam is in a hollow design, the column heads of the herringbone columns are fixedly connected with the cross beam, and the adjacent herringbone columns form a span; the beam is provided with temperature expansion joints at the length of 3-6 spans, and the expansion joints are provided with a connecting insertion pipe.

Furthermore, the cross beam is divided into an inter-column cross beam and a column head cross beam, the head end of each herringbone column supports the column head cross beam, two ends of the cross beam are respectively provided with a flange, two ends of the inter-column cross beam are respectively correspondingly connected with a flange plate, and the inter-column cross beam is fixed on the herringbone columns at two ends through flange connection.

Furthermore, the temperature expansion joint is arranged on a cross beam between the columns, the cross beam is divided into two parts, one end of the insertion pipe is fixedly connected with the cross beam, the other end of the insertion pipe is inserted into the cross beam, a gap is formed between the insertion pipe and the inner wall of the cross beam, and the gap is 3 mm.

Furthermore, a vertical stiffening plate is arranged in the middle of the upper end of the herringbone column, the lower part of the stiffening plate is welded and fixed on the herringbone column, and the upper end of the stiffening plate passes through the cross beam and then abuts against the inner wall of the cross beam and is welded and fixed; and fixing the welding seam at the position of the through beam.

Furthermore, three groups of transverse stiffening plates are sequentially arranged on the vertical stiffening plate from top to bottom.

Furthermore, the periphery of the expansion joint is sleeved with a circle of cover plate to prevent rainwater from entering the expansion joint.

The utility model has the advantages of having optimized transformer framework mechanism, having concretied structure and temperature expansion joint through structure herringbone post column cap and roof beam, the two corresponds complex design, gets rid of the both ends support pillar of framework, improves design standard, and then is favorable to electrical equipment's nimble arrangement, reduces the occupation of land space that the place was arranged.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the construction of the column head;

FIG. 3 is a schematic view of the connection of the telescopic cross beam with the column head;

FIG. 4 is a schematic diagram of a unit 5 column 4 cross temperature stress calculation node location;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, the utility model provides a 66-220 kv consolidation power transformation framework without end bracing, which comprises a beam 1 and a plurality of herringbone columns 2 for supporting the beam 1, wherein at least 4 herringbone columns 2 are arranged; the cross beam 1 is tubular, the section can be designed to be polyhedral according to the calculation requirement, the column head of the herringbone column 1 is fixedly connected with the cross beam, and the adjacent herringbone columns 1 form a span; the beam 1 is provided with temperature expansion joints 3 at the length of 3-6 spans, and the expansion joints 3 are provided with a connecting insertion pipe 4. The crossbeam is integrally divided into a plurality of sections, and comprises an inter-column crossbeam 11 and column head crossbeams 12, the head end of each herringbone column 2 is supported with the column head crossbeam 12, two ends of the column head crossbeam 12 are respectively provided with a flange 5, two ends of the inter-column crossbeam 12 respectively correspond to the connecting flange plates 5, and the inter-column crossbeam is fixed on the herringbone columns at two ends through the connection of the flanges 5. The temperature expansion joint 3 is arranged on a beam 12 between columns, and the beam is divided into two parts which are connected through an insertion pipe. One end of the insertion pipe 4 is fixedly welded with the cross beam, the other end of the insertion pipe is inserted into the cross beam on the opposite side, and a gap is formed between the other end of the insertion pipe and the inner wall of the cross beam and is 3 mm.

The consolidation structure of beam column node:

in the consolidation power transformation framework without the end support, the vertical stiffening plate 6 is arranged in the middle of the upper end of the herringbone column 2, the lower part of the stiffening plate 6 is welded and fixed on the herringbone column 2, and the upper end of the stiffening plate passes through the cross beam 1 and then abuts against the inner wall of the cross beam 1 and is welded and fixed; and fixing the welding seam at the position of the through beam. In the existing steel pipe framework with hinged calculation, beam-column joints are subjected to force transmission by steel pipe beam skins under the action of side shifting load, and the pipe walls are locally unstable to damage the bearing capacity. Therefore, the structure fixing frame directly extends into the inner upper skin of the beam 1 by utilizing the connecting part of the beam and the column and the stiffening plate 6 (shear plate) which is positioned under the beam and clamped between the herringbone columns, and transmits the bending moment and the shearing force between the beam and the column by using the shear plate.

Referring to fig. 2, as an improvement of the scheme, three groups of transverse stiffening plates 7 are sequentially arranged on the vertical stiffening plate 6 from top to bottom, one end of each transverse stiffening plate 7 is welded on the herringbone column, and the other end of each transverse stiffening plate 7 is welded on the middle vertical stiffening plate 6.

As the improvement of the scheme, a circle of cover plate 5 is fixed on the peripheral bolt of the expansion joint to prevent rainwater from entering the expansion joint.

According to the utility model discloses a another aspect provides a transformer framework performance's accounting method based on any one of the aforesaid, concreties the calculation of transformer framework and includes the following computational step:

step 1, fixing a structure frame, arranging temperature expansion joint sections in a proper span, wherein the load in each section is the wind pressure of a guide wire and a ground wire; conducting ground wire angle load; the lightning rod, the ground wire bracket or the upper column structure is formed by wind pressure, which is called a strong wind combination for short;

step 2, dividing the expansion joint for the framework into a plurality of calculation units, and calculating the lateral movement bending moment and the shearing force of each unit beam and column through a classical equation of a structural mechanics displacement method;

step 3, calculating the temperature stress (bending moment and shearing force) of the beam and the column of each unit;

step 4, calculating the column axial force in the tension direction of the herringbone column (vertical to the lateral movement direction), wherein the wire tension is also taken according to the working condition of strong wind under the general condition;

and 5, superposing the temperature stress, the lateral movement bending moment of the framework, the shearing force and the shaft force of the herringbone column of each unit, and checking the strength, the rigidity and the stability of the steel according to the unit with the maximum superposed stress.

The temperature stress of the consolidation transformation framework is calculated, the temperature stress is calculated by the elongation or the shortening of the beam, so that the herringbone columns contract (or expand outwards) along the symmetry axis of each unit framework, the maximum deformation value,

＝αΔtnL/2

wherein the elongation or contraction value of the unit frame beam is mm, and the linear expansion coefficient of the alpha-steel is a fixed value of 1.2 multiplied by 10^-5(mm/. degree. C.); combining the calculated temperature difference of the delta t-strong wind combined structure with strong wind, and taking 35 ℃; nL/2-half of the total length of the truss beam. Where n is the span and L is the length of the beam between two human struts.

Referring to fig. 4, when the temperature stress is calculated by the displacement method, the column base of the column except the symmetry axis is broken off by the displacement of the symmetry axis column base 0 and the side column base one unit, and the pre-displacement between the side column base and the symmetry axis column base is proportionally distributed. For example, the first side column side shift is set from the left side column₁＝_1x(one unit displacement); second column₂＝_1x2 (5 columns with 4 spans, axis of symmetry on the third column), is 1/2 for one unit displacement; the third column is on the symmetry axis, the displacement is 0, and the fourth column is symmetrical to the second column₄＝₂(ii) a The fifth column is symmetrical to the first column₅＝₁The above is the basic format of a typical equation of the temperature stress displacement method, which is called the temperature response equation for short. The free term of the temperature response equation is filled with external load, 1 node is filled with 0 (no external load), 2 node is filled with 0 (same as above), and 3 node is filled with external force P_W，P_WEstimated by beam stiffness infinity (so P_WBig value)

P_W(6i/L +6i/2L), i is a columnL is the column height. Solving the equation yields the preliminary displacement values for the 1,2,3 nodes (1, 2 nodes are corner radians, 3 nodes are displacement millimeters) because P_WLarge, preliminary displacement of 3 nodes_{Big (a)}Must be greater than the maximum value of thermal contraction or expansion (greater value is called_{Big (a)}). At this time, P in the free term is further reduced_WValue of, solved for_{Big (a)}As a result, the following is obtained: the angle of rotation produced by the beam contraction or expansion (external load) at the 1-node last is θ₁And the angle of rotation generated by the 2-node is theta₂The shift generated by the 3 node is (reduced to, i.e. reduced to)_{Big (a)}Either). By final theta₁，θ₂And calculating the bending moment or shearing force of the temperature stress of the fixed structure frame, and then superposing the bending moment or shearing force with the lateral movement.

The utility model discloses a design of this method can cancel the both ends support post of framework, improves the design standard, and then is favorable to electrical equipment's nimble arranging, reduces the occupation of land space that the place was arranged. The design method breaks through the conventional concept of structural design in the current power industry, the temperature expansion joint is arranged on a cross beam of a power transformation structural frame for the first time to resist lateral displacement, on the basis of the structure, the traditional hinged design structure of the conventional herringbone column and the cross beam is changed, fixed connection is adopted, on the basis of the overall design of the cross beam, a column head structure is constructed at the joint of a column head and the cross beam, the steel pipe structural frame of the current hinged calculation is characterized in that under the action of lateral shifting load, a beam column node is transferred by a steel pipe beam skin, and the pipe wall can be locally unstable to damage the bearing capacity. Therefore, the structure fixing frame directly extends into the inner upper skin of the beam by utilizing the beam-column connection part and the shear plate which is positioned under the beam and clamped between the herringbone columns, and the shear plate (stiffening plate) is used for transmitting the bending moment and the shear force between the beam columns. The size of the expansion joint and the thickness of the stiffening plate are calculated and designed according to the mechanical stability of the whole framework.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a 66 ~ 220kv consolidation power transformation framework that does not take end to prop which characterized in that: the framework comprises a cross beam and a plurality of herringbone columns for supporting the cross beam; the cross beam is in a hollow design, the column heads of the herringbone columns are fixedly connected with the cross beam, and the adjacent herringbone columns form a span; the beam is provided with temperature expansion joints at the length of 3-6 spans, and the expansion joints are provided with a connecting insertion pipe.

2. The 66-220 kv consolidation power transformation framework without the end support of claim 1, wherein: the cross beam is divided into an inter-column cross beam and a column head cross beam, the head end of each herringbone column is supported with the column head cross beam, two ends of the cross beam are respectively provided with a flange, two ends of the inter-column cross beam are respectively and correspondingly connected with a flange plate, and the inter-column cross beam is fixed on the herringbone columns at the two ends through flange connection.

3. The 66-220 kv consolidation power transformation framework without the end support of claim 2, wherein: the temperature expansion joint is arranged on the beam between the columns, the beam is divided into two parts, one end of the insertion pipe is fixedly connected with the beam, the other end of the insertion pipe is inserted into the beam, a gap is formed between the insertion pipe and the inner wall of the beam, and the gap is 3 mm.

4. The 66-220 kv consolidation power transformation framework without the end support of claim 2, wherein: the middle of the upper end of the herringbone column is provided with a vertical stiffening plate, the lower part of the stiffening plate is welded and fixed on the herringbone column, and the upper end of the stiffening plate passes through the cross beam and then abuts against the inner wall of the cross beam and is welded and fixed; and fixing the welding seam at the position of the through beam.

5. The 66-220 kv consolidation power transformation framework without the end support of claim 4, wherein: three groups of transverse stiffening plates are sequentially arranged on the vertical stiffening plate from top to bottom.

6. The 66-220 kv consolidation power transformation framework without the end support of claim 1, wherein: the periphery of the expansion joint is sleeved with a circle of cover plate.