CN210621777U - Box-type substation earthquake-resistant structure - Google Patents
Box-type substation earthquake-resistant structure Download PDFInfo
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- CN210621777U CN210621777U CN201921457515.9U CN201921457515U CN210621777U CN 210621777 U CN210621777 U CN 210621777U CN 201921457515 U CN201921457515 U CN 201921457515U CN 210621777 U CN210621777 U CN 210621777U
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Abstract
The utility model discloses a box-type substation earthquake-resistant structure, including the welding U type channel steel on the electrical piece that buries in civil engineering basis top, U type channel steel opening upwards, a pair of antidetonation rubber piece has been placed to the symmetry in the U type channel steel, and the square steel activity cartridge of box-type substation bottom is in the U type channel steel that is located between two antidetonation rubber pieces, and square steel and U type channel steel are with the central line. The utility model has the advantages that the box-type transformer substation is movably inserted into the U-shaped channel steel with the upward opening, and the box-type transformer substation is simple to install; when an earthquake occurs, the square steel has small displacement in the U-shaped channel steel, the friction force between the square steel and the U-shaped channel steel can dissipate energy through friction, the anti-seismic rubber block can absorb energy through buffering, the air gap can increase the deformation of each tooth of the anti-seismic rubber block, the gradient of the earthquake energy transmitted to the box-type substation is reduced, the energy absorption period is long, and the peak value of the box-type substation absorbing the earthquake energy is reduced to the maximum extent.
Description
Technical Field
The utility model belongs to the technical field of the distribution and transformation system and specifically relates to a box-type substation earthquake-resistant structure is related to.
Background
China is a country with frequent earthquakes, and has high frequency, high strength, shallow seismic source and wide distribution of earthquake activities. Since the 20 th century, more than 6 earthquake grades occur in China nearly 800 times, and the earthquake is distributed in all provinces and urban areas except the Guizhou, Jiangzhe and Zhejiang provinces and hong Kong special administrative areas. According to preliminary statistics, the number of people who die from earthquakes in China is as many as 55 ten thousands in 1900 years, and accounts for 53 percent of the number of people who die from earthquakes in the world; since 1949, 100 destructive earthquakes hit 22 provinces (autonomous region, city in the direct prefecture), wherein 14 provinces in the eastern region are involved, and 27 million people are lost, which accounts for 54% of all people who die due to disasters in China. The severity of earthquakes and other natural disasters constitutes one of the fundamental national conditions in china. When an earthquake occurs, seismic waves generated by a seismic source are divided into three types according to propagation modes: longitudinal waves, transverse waves, and surface waves. The longitudinal wave is a propulsion wave, the propagation speed in the crust is 5.5-7.0 km/s, the longitudinal wave enables the ground to vibrate up and down in the vertical direction, and the destructiveness is weak; the transverse wave is shear wave, the propagation speed in the crust is 3.2-4.0 km/s, the transverse wave enables the ground to shake forwards and backwards and leftwards and rightwards in the horizontal direction, and the destructiveness is strong; the surface wave is a mixed wave generated by excitation after the longitudinal wave and the transverse wave meet on the earth surface, has large wave length and strong amplitude, can only propagate along the earth surface, and is a main factor causing strong damage to ground facilities.
Since the late 70 s in the 20 th century in China, box-type substations were introduced from france, germany and other countries, and are new substations which have grown up after conventional civil substations, in which all electrical elements are installed in a fireproof, moistureproof, heat-insulating and airtight mobile steel structure box. The existing box-type transformer substation consists of a high-voltage unit, a transformer unit and a low-voltage unit, wherein a high-voltage switch cabinet, a power supply inlet wire, electric energy metering and the like are installed in the high-voltage unit; a dry type transformer is installed in the transformer unit in order to change a high voltage into a low voltage; the low-voltage unit is provided with a low-voltage switch cabinet, and mainly meets the requirement of low-voltage outgoing lines. At present, the manufacturing of box-type substations is a mature technology, and can meet the engineering construction requirements of various industries.
In practical engineering application, it is indispensable to provide a necessary good operation environment in order to ensure stable and reliable operation of a box-type substation. The reqin of China is vast, the environmental conditions of different areas are different, the northern area is a high-cold area, the western area is a high-altitude and low-temperature area, the southern area is a high-humidity and high-temperature area, and the coastal area is high-salt fog. In the normal use conditions and special use conditions specified in the national standard high-voltage/low-voltage prefabricated substation (GB 17467-2010), obvious technical requirements are made on high altitude and dirty environmental conditions. But the standard is not clear to the technical specifications of the seismic environment conditions. The seismic capacity of the box-type transformer substation sold in the market at present depends on the level of seismic technology of manufacturers, and the seismic level of a civil engineering foundation of the box-type transformer substation depends on the level of engineering designers and the construction level of an engineering construction unit.
The civil engineering foundation of the existing box-type substation is rigidly connected with the box-type substation, namely, a plurality of electrical embedded parts are embedded in the top of the civil engineering foundation, then a circle of U-shaped channel steel with a downward opening is welded on the electrical embedded parts, and the foundation square steel at the bottom of the box-type substation is welded on the top of the U-shaped channel steel. The rigid connection mode is used in areas where earthquakes are easy to occur (such as western areas in China), and when an earthquake occurs, the box-type substation is easy to damage and power off, so that post-earthquake disaster relief and post-earthquake recovery power supply are seriously affected, and the concrete reasons are as follows: the foundation square steel at the bottom of the box-type transformer substation is rigidly connected with the civil foundation, and seismic energy is transmitted into the box-type transformer substation to cause cracking of electrical components and loosening of electrical connection, so that interphase short circuit and relative ground short circuit are caused, further, relay protection action is powered off, and power supply is interrupted.
Disclosure of Invention
An object of the utility model is to provide an effectual box-type substation seismic structure of antidetonation.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
the box-type substation anti-seismic structure comprises U-shaped channel steel welded on an electrical embedded part at the top of a civil engineering foundation, wherein the opening of the U-shaped channel steel is upward, a pair of anti-seismic rubber blocks in a structure like a Chinese character 'shan' is vertically and symmetrically placed in the U-shaped channel steel, square steel at the bottom of the box-type substation is movably inserted in the U-shaped channel steel between the two anti-seismic rubber blocks, and the square steel and the U-shaped channel steel are in the same central line; two the antidetonation rubber piece is vertical to be placed, and three teeth of every antidetonation rubber piece all point to square steel and enclose into the air gap with it.
The square steel is of a hollow structure, and the surface of the square steel is galvanized.
The utility model changes the rigid connection mode of the traditional box-type substation and the civil engineering foundation, and the box-type substation is movably inserted into the U-shaped channel steel with the upward opening, so that the box-type substation is simple to install; when an earthquake occurs, the square steel has small displacement in the U-shaped channel steel, the friction force between the square steel and the U-shaped channel steel can dissipate energy through friction, the anti-seismic rubber block can absorb energy through buffering, the air gap between the anti-seismic rubber block and the square steel can increase the deformation of each tooth of the anti-seismic rubber block, the transmission steepness of earthquake energy to the box-type substation is reduced, the energy absorption period is long, the peak value of the absorbed earthquake energy is reduced to the maximum extent, the phenomena of inclination, toppling, deformation and the like of the box-type substation caused by rigid connection are avoided, the energy transmitted to the box-type substation by the earthquake can be reduced, the operating environment of the box-type substation can be reduced by 2-3 earthquake levels; for the major earthquakes above the 6 th level, the earthquake-resistant effect is more obvious. Specifically, when the wave crest of the transverse seismic wave is transmitted, the seismic energy is the largest, and the friction force of the square steel and the U-shaped channel steel and the buffering action of the anti-seismic rubber block are utilized to absorb energy together; when the earthquake tail wave is transmitted, the earthquake energy is smaller, the large deformation of the earthquake-resistant rubber block is utilized to buffer and dissipate the energy, the earthquake energy is prevented from being transmitted to the box-type transformer substation to the maximum extent, and the earthquake-resistant effect is good.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is the installation position diagram of the utility model and the civil engineering foundation.
Fig. 3 is a schematic sectional view along the direction B-B in fig. 2.
Fig. 4 is a schematic sectional view in the direction of C-C in fig. 2.
Detailed Description
As shown in fig. 1, box-type substation antidetonation structure, including welding on civil engineering basis top electrical buried component 1, the ascending U type channel steel 2 of opening (the model is 25# zinc-plated channel steel), the roughness of U type channel steel 2 horizontal direction is 0.3%, a pair of antidetonation rubber block 3 that is "mountain" font structure has been placed to vertical symmetry in the U type channel steel 2, square steel 4.1 (the square steel is the hollow steel pipe of galvanization, the size is 150mm 80 mm) activity cartridge of 4 bottoms of box-type substation is in the U type channel steel 2 that is located between two antidetonation rubber blocks 3, square steel 4.1 and U type channel steel 2 are with the central line, every 3 equal directional square steel 4.1 of three tooth of antidetonation rubber block and enclose rather than the air gap, increase the deflection of every tooth of antidetonation rubber block, increase the buffering and inhale the energy. Because the square steel 4.1 is movably connected with the U-shaped channel steel 2, the square steel 4.1 has smaller displacement under the action of earthquake energy, and the inclination, the toppling and the deformation of the box-type substation 4 caused by rigid connection are completely avoided; when an earthquake occurs, the square steel 4.1 and the U-shaped channel steel 2 can dissipate energy through friction, the high viscoelasticity of the anti-seismic rubber block 3 enables the anti-seismic rubber block to generate large deformation buffering, the energy dissipation can be buffered, the gradient of the earthquake energy transmitted to the box-type substation is reduced, the energy absorption period is long, the peak value of the box-type substation absorbing the earthquake energy is reduced to the maximum extent, and the earthquake energy transmitted to the box-type substation 4 is reduced.
During actual construction, the civil foundation adopts a box body structure as shown in figures 2-4: the civil engineering foundation comprises a strip foundation 6 (the strip foundation is formed by pouring C30 reinforced concrete) poured on the periphery of the bottom of a box-type substation foundation pit, the lower part of the strip foundation 6 is of a rectangular structure, the upper part of the strip foundation 6 is of a trapezoidal structure with a narrow upper part and a wide lower part, the width of the bottom surface of the strip foundation 6 is 1100mm, the thickness of the strip foundation 6 is 270mm, the strip foundation 6 and the box-type substation foundation pit are ensured to have enough contact area and serve as 'big feet' of an anti-seismic foundation, a complete integral structure can be presented when seismic waves are transmitted;
a foundation slab is laid in a rectangular groove surrounded by a strip foundation 6, the foundation slab comprises a broken stone cushion 7.1 (the thickness is 80 mm), a concrete layer 7.2 (C15 concrete with the thickness of 80 mm) and a waterproof layer 7.3 (the thickness is 20 mm) which are laid at the bottom of a foundation pit of a box-type substation from bottom to top in sequence, the waterproof layer 7.3 is prepared by cement mortar and a waterproof agent (the waterproof agent can be waterproof powder) according to the proportion of 1:2, the broken stone cushion 7.1 has the function of friction and energy absorption, the concrete layer 7.2 ensures the structural strength of the foundation slab, and the waterproof layer 7.3 ensures the waterproof performance;
building a retaining wall 8 with the thickness of 240mm on the upper surface of the strip foundation 6 by red bricks and mortar, ensuring that the vertical central line of the retaining wall 8 is superposed with the vertical central line of the strip foundation 6 during building, wherein the building height of the retaining wall 8 is 1000mm of the underground part and 700mm of the overground part; compared with reinforced concrete, the retaining wall 8 has certain flexibility, namely a flexible leg of the civil foundation, can absorb part of seismic energy transmitted by the strip foundation 6, and has an energy dissipation effect;
the inner side surface of the retaining wall 8 is pre-embedded with a steel bar ladder 9, so that the installation and the periodic maintenance and overhaul are convenient; two ventilation windows 10.1 with the size of 400mm multiplied by 180mm are respectively arranged at the top parts of the front wall and the rear wall of the retaining wall 8, and a protective breathable net 10.2 made of a steel wire mesh is arranged at the outer side of each ventilation window 10.1, so that the ventilation performance can be ensured, and external sundries, birds, mice and the like can be prevented from entering an inner cavity of the anti-seismic foundation base;
a concrete foundation 11 is poured on the top of the retaining wall 8 (the concrete foundation 11 is formed by pouring C30 reinforced concrete), an operation platform 12 (the operation platform is formed by pouring C30 reinforced concrete) which extends horizontally and outwards and has a net width of 1000mm is poured on the outer side of the concrete foundation 11, a protection fence 13 with a height of 1200mm is arranged on the periphery of the operation platform 12, an operation platform access opening is reserved on the protection fence 13, and a two-stage step 14 is built on the ground corresponding to the access opening of the operation platform; electric embedded parts 1 (model number is D3030A) are embedded at the top of the concrete foundation 11 at intervals, the distance between every two adjacent electric embedded parts 1 is 800mm, the embedded height of each electric embedded part 1 is consistent with the height of the top of the concrete foundation 11, and the horizontal flatness of the U-shaped channel steel 2 is ensured.
The utility model discloses a construction method of box-type substation anti-seismic structure, including following step:
firstly, excavating a box-type substation foundation pit, wherein the excavation depth of the box-type substation foundation pit is 1300mm, and the clear height of a space below the bottom of a box-type substation 4 is not less than 1100 mm; tamping the pit bottom of the foundation pit of the box-type substation after the excavation is finished;
secondly, pouring a strip-shaped foundation 6 on the bottom of the foundation pit of the box-type substation by using C30 reinforced concrete along the circumferential direction of the foundation pit, paving a foundation slab in a rectangular groove formed by the strip-shaped foundation 6, paving a plain soil layer on the bottom of the foundation pit of the box-type substation, and then sequentially paving a broken stone cushion layer 7.1, a concrete layer 7.2 and a waterproof layer 7.3 on the plain soil layer from bottom to top during paving;
thirdly, building a retaining wall 8 on the upper surface of the strip foundation 6 by using red bricks and mortar, wherein the vertical central line of the retaining wall 8 is superposed with the vertical central line of the strip foundation 6 during building, 4 high-voltage cable embedded pipes 15 (the model is phi 150PVC pipes), 12 low-voltage cable embedded pipes 16 (the model is phi 50PVC pipes) and a ladder are respectively embedded at the design position of the retaining wall 8, and the height of the retaining wall 8 is higher than the depth of a foundation pit of the box-type substation; the inner surface and the outer surface of the retaining wall 8 are coated with waterproof glue for three times after being coated with mortar, so that the waterproof performance is ensured; after the retaining wall 8 is built, two ventilation windows 10.1 with the size of 400mm multiplied by 180mm are respectively arranged at the top parts of the front wall and the rear wall of the retaining wall 8 at intervals, and a protective breathable net 10.2 is arranged outside each ventilation window 10.1;
fourthly, respectively pouring a concrete foundation 11 and an operating platform 12 by using C30 reinforced concrete at the top of the retaining wall 8, simultaneously embedding the electrical embedded parts 1 at intervals along the circumferential direction of the concrete foundation 11 at the top of the concrete foundation 11, safely arranging a circle of protective fence 13 at the edge of the operating platform 12, reserving an operating platform access on the protective fence 13, and building two steps 14 on the ground corresponding to the operating platform access;
fifthly, after the electrical embedded part is cleaned and derusted, U-shaped channel steel 2 with an upward opening is laid on the concrete foundation 11 along the circumferential direction of the concrete foundation, the U-shaped channel steel 2 and the electrical embedded part 1 are welded into a whole, welding slag at all welding points is cleaned after welding is finished, and the welding points are subjected to rust prevention treatment;
hoisting a box-type substation 4 (a manhole communicated with an inner cavity of an earthquake-resistant foundation is arranged on a low-voltage unit bottom plate of the box-type substation 4 at a position corresponding to the crawling ladder, and a manhole cover is arranged on the manhole to facilitate inspection and overhaul), inserting square steel 4.1 at the bottom of the box-type substation 4 into the U-shaped channel steel 2, and adjusting the square steel 4.1 to enable the central line of the square steel to coincide with the central line of the U-shaped channel steel 2; after the square steel is adjusted in place, a pair of anti-seismic rubber blocks 3 in a herringbone structure are symmetrically and vertically inserted into the U-shaped channel steels 2 on the two sides of the square steel 4.1, three teeth of each anti-seismic rubber block 3 point to the square steel 4.1, an air gap is defined between each anti-seismic rubber block 3 and the galvanized square steel 4.1, and construction operation of an anti-seismic structure and hoisting operation of the box-type substation 4 are completed;
sixthly, connecting a high-voltage cable 18 led out by a high-voltage cable buried pipe 15 into a wiring terminal of a high-voltage unit of the box-type substation 4, connecting a low-voltage cable 17 led out by a low-voltage cable buried pipe 16 into a wiring terminal of a low-voltage unit of the box-type substation 4, wherein the low-voltage cable and the high-voltage cable are distributed in an S shape in the inner cavity of the earthquake-resistant foundation, so that the low-voltage cable and the high-voltage cable have margins, and the wiring terminal is prevented from being damaged by stress of the low; and completing the installation operation of the box-type substation 4 after the low-voltage cable and the high-voltage cable are connected into the box-type substation 4.
Claims (2)
1. The utility model provides a box-type substation earthquake-resistant structure, includes U type channel-section steel (2) of welding on civil engineering basis top electrical buried spare (1), its characterized in that: u type channel-section steel (2) opening is upwards, and a pair of antidetonation rubber piece (3) that are "mountain" font structure are placed to vertical symmetry in U type channel-section steel (2), and square steel (4.1) activity cartridge of box-type substation (4) bottom is being located two in U type channel-section steel (2) between antidetonation rubber piece (3), square steel (4.1) and U type channel-section steel (2) homocentric line, every three teeth of antidetonation rubber piece (3) all point to square steel (4.1) and enclose into air gap (5) rather than.
2. The box-type substation seismic structure of claim 1, characterized in that: the square steel (4.1) is of a hollow structure.
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| CN110409517A (en) * | 2019-09-04 | 2019-11-05 | 河南省水利勘测设计研究有限公司 | Box-type substation anti-seismic structure and its construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110409517A (en) * | 2019-09-04 | 2019-11-05 | 河南省水利勘测设计研究有限公司 | Box-type substation anti-seismic structure and its construction method |
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