CN213742622U - Extra-high voltage direct current large-span tangent tower - Google Patents
Extra-high voltage direct current large-span tangent tower Download PDFInfo
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- CN213742622U CN213742622U CN202022430013.6U CN202022430013U CN213742622U CN 213742622 U CN213742622 U CN 213742622U CN 202022430013 U CN202022430013 U CN 202022430013U CN 213742622 U CN213742622 U CN 213742622U
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- 238000005192 partition Methods 0.000 claims abstract description 14
- 239000000725 suspension Substances 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 47
- 230000005540 biological transmission Effects 0.000 abstract description 11
- 238000005457 optimization Methods 0.000 abstract description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract 1
- 230000004888 barrier function Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 38
- 229910052742 iron Inorganic materials 0.000 description 19
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 230000008859 change Effects 0.000 description 7
- 230000009194 climbing Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
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- 239000012212 insulator Substances 0.000 description 3
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- 238000006073 displacement reaction Methods 0.000 description 1
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Abstract
The utility model provides an extra-high voltage direct current large-span tangent tower invented in the tin union area, belonging to the technical field of extra-high voltage direct current transmission lines, comprising a tower body, a tower head arranged on the upper part of the tower body and tower legs arranged on the lower part of the tower body; the tower head is of a spread-wing type and comprises a lead cross arm and a ground wire bracket arranged on the lead cross arm; the ground wire bracket is of a triangular outer suspension structure; the tower body slope changing part, the section part directly subjected to torsion and the section parts at the top of the tower and the top of the tower legs are all provided with transverse partition surfaces. The utility model discloses carry out design optimization from tangent tower's tower type, structural arrangement etc. has solved the limitation of traditional tangent tower design, has improved the ability of bearing external force of tangent tower, can satisfy and stride across big span barrier such as river, stable in structure.
Description
Technical Field
The utility model relates to an extra-high voltage direct current transmission line technical field, concretely relates to extra-high voltage direct current strides across tangent tower greatly.
Background
Direct current ultra-high voltage (UHVDC) refers to direct current transmission with voltage levels of +/-800 kV (+/-750 kV) and above and related technologies. The direct-current ultra-high voltage transmission has the main characteristics of large transmission capacity and high voltage, and can be used for asynchronous networking of a power system. The design range of the Zhangute-Shandong +/-800 kV ultrahigh voltage direct current transmission line engineering yellow river large-span section is from a large-span left bank strain tower (located on the left bank beach of the yellow river) to a large-span right bank strain tower (located on the right bank beach of the yellow river). The safety, the rationality and the economy of the tower are the key points of the design. Compared with the common iron tower load, the iron tower load of the large span section is increased, the overall dimension of the tower is increased, the structural style is complex, the external force to be borne is also larger, and the traditional design concept and means have certain limitations in the tower design and cannot meet the technical requirements.
Patent document with publication number CN103046794A discloses an extra-high voltage direct current crank arm tangent tower, belonging to the field of iron towers for transmission lines. The crank arm tangent tower comprises: single return circuit crank arm tangent tower and multiloop crank arm tangent tower, single return circuit crank arm tangent tower includes at least: the tower comprises a tower body, an insulator string, a crank arm cross arm, a ground wire support, a cross arm hanging point and a tower body hanging point; the crank arm cross arm is provided with the cross arm hanging point, and the tower body is provided with the tower body hanging point. The two ends of a hanging point of the V-shaped insulator string are respectively connected with a cross arm hanging point arranged on a crank arm cross arm and a hanging point at a position corresponding to a tower body arranged on the tower body and having the same height; the length of the cross arm and the length of the insulator string are reduced on the premise of meeting the electric clearance, the inter-electrode distance is reduced, the tower weight is reduced, the corridor occupied width of a power transmission line is reduced, the removal amount is reduced, and the economy is improved.
Disclosure of Invention
In view of this, the utility model provides an extra-high voltage direct current strides across tangent tower greatly.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is:
an extra-high voltage direct current large-span tangent tower comprises a tower body, a tower head arranged at the upper part of the tower body and tower legs arranged at the lower part of the tower body; the tower head is of a spread-wing type and comprises a lead cross arm and a ground wire bracket arranged on the lead cross arm; the ground wire bracket is of a triangular outer suspension structure; the tower body slope changing part, the section part directly subjected to torsion and the section parts at the top of the tower and the top of the tower legs are all provided with transverse partition surfaces.
Further, the width of the tower body opening is 5-7 m.
Furthermore, the gradient of the slope change of the upper part of the tower body is 7.4-7.6%, and the gradient of the slope change of the lower part of the tower body is 11%.
Furthermore, the included angle between the web member of the tower body and the main material is 40-50 degrees.
Further, the spacing between the transverse partition surfaces is not more than 25 m.
The utility model has the advantages that:
the tower head is of a spread-fin type, and the appearance is in clearance fit with the electric cable compactly; the structure is simple in stress; the height of the tower body is minimum; the appearance is more beautiful. The ground wire support is a triangular outer suspension structure, external force is directly transmitted to the cross arm main material through the triangular structure, the structure is stable, the force transmission path is simple, the size and the gradient of the end part of the cross arm can be reduced due to the proper outer suspension length, and the wire hanging mode adopts an I-string mode. The cross partition surfaces are arranged at the slope-changing position of the tower body, the section directly subjected to the torsion and the sections at the top of the tower and the tops of the tower legs, so that the torsional rigidity of the structure can be effectively increased, and the torsion generated by external load on the upper part of the structure is transferred; meanwhile, the tower body member internal force balancing device has a certain function of balancing the internal force of the tower body member, and has an obvious function of transferring the torsion generated by external load on the upper part of the structure downwards, reducing the tower weight and balancing the internal force of the tower body member.
The width of the crossing tower opening is selected to be 5.0-7.0 m, the self rigidity of the tower meets the requirement, and the width value of the tower opening of the long-crossing straight line is recommended to be 6.0m according to the optimal principle of the tower weight.
When the gradient of the upper variable slope is 7.4-7.6% and the gradient of the lower variable slope is 11%, the tower weight index is the lowest. Although the acting force is not the lowest, considering that the yellow river crossing foundation is mainly controlled by the calculated outcrop, the change of the acting force does not influence the foundation engineering quantity, therefore, the application preferably takes 7.5 percent of the slope change gradient at the upper part of the crossing tangent tower and 11 percent of the slope change gradient at the lower part.
Through reasonable design of the web members, the included angle between the web members and the main material is 40-50 degrees, the stress of the diagonal material of the web members is small, and the stress of the diagonal material of the whole tower body is uniform.
The large-span tower needs to be provided with an iron tower climbing machine, so that the horizontal wind load can be effectively transmitted to the tower body, and the tower climbing facility is considered to stop in the middle section of the tower body, therefore, the distance between the transverse partition surfaces is not too large and is not more than 25 m.
The large span engineering is different from the general engineering, and the problems of navigation, flood discharge and the like all put higher requirements on the safety and reliability of the large span engineering. Meanwhile, the construction, overhaul and rescue difficulty is high, so that the project can be ensured to be complete in the design stage. This application is from design optimization such as tangent tower's tower type, structural arrangement, has solved the limitation of traditional tangent tower design, can satisfy to stride across big span obstacles such as river, and the external force that bears is bigger, stable in structure.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the extra-high voltage direct current large-span tangent tower of the utility model.
Fig. 2 is a schematic structural view of the cross partition of the present invention.
The meaning of the respective reference numerals is as follows:
1: ground wire support, 2: tower head, 3: a tower body and 4: tower legs, 5: a transverse partition surface.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1-2 of the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived from the description of the embodiments of the present invention by a person skilled in the art, are within the scope of the present invention.
Example 1
As shown in fig. 1 and 2, the embodiment provides an extra-high voltage direct current large-span tangent tower, which includes a tower body 3, a tower head 2 disposed at an upper portion of the tower body 3, and tower legs 4 disposed at a lower portion of the tower body 3; the tower head 2 is of a spread-wing type, and the tower head 2 comprises a lead cross arm and a ground wire support 1 arranged on the lead cross arm; the ground wire bracket 1 is of a triangular outer suspension structure; the tower body slope changing part, the section part directly subjected to torsion and the section parts at the top of the tower and the top of the tower legs are all provided with transverse partition surfaces.
The width of the tower body opening is 5-7 m.
The gradient of the upper part of the tower body is 7.4-7.6%, and the gradient of the lower part is 11%.
The spacing between the transverse partition surfaces is not more than 25 m.
The tower is high in height, the influence of tower body wind pressure on the internal force of a pole piece is large, the specific gravity of the tower body wind load of the large-span tower, which accounts for 60% -70% of the wind load of the whole tower system, is high, and the selection of the iron tower type with the small tower body wind load effect is particularly important. Compared with an angle steel tower, the steel pipe tower has the characteristics of strong load bearing capacity, good overall stability, small stress and foundation acting force of a tower body structure, small material consumption and the like, so that the steel pipe tower is adopted as a tower type of a straight line crossing tower. Because the high-strength steel pipe is adopted, the section bearing capacity can be effectively improved, the section size of the steel pipe is effectively reduced under the same load effect, and for the large-span tangent tower, the tower body wind load is larger in proportion, and the tower body wind load reduced due to the reduction of the wind shielding area further reduces the internal force of the main material of the iron tower, so that the tower material index can be effectively reduced by adopting the high-strength steel pipe material. Therefore, the straight tower adopts a Q420 steel pipe tower.
The design of the ground wire hanging part adopts a triangular outer suspension structure, external force is directly transmitted to the cross arm main material through the triangular structure, the structure is stable, the force transmission path is simple, the size and the gradient of the end part of the cross arm can be reduced by proper outer suspension length, and the wire hanging mode adopts I-string.
The cross partition surfaces are arranged at the slope-changing position of the tower body, the section directly subjected to the torsion and the sections at the top of the tower and the tops of the tower legs, so that the torsional rigidity of the structure can be effectively increased, and the torsion generated by external load on the upper part of the structure is transferred; meanwhile, the tower body member internal force balancing device has a certain function of balancing the internal force of the tower body member, and has an obvious function of transferring the torsion generated by external load on the upper part of the structure downwards, reducing the tower weight and balancing the internal force of the tower body member. In the section with constant gradient of the tower body, the distance between the transverse partition surfaces is generally not more than 5 times of the average width, and is not suitable to be more than 4 main material sections. In order to effectively transmit the horizontal wind load to the tower body and consider the stopping of the tower climbing facility in the middle section of the tower body, the distance between the transverse partition surfaces is not too large and is not more than 25m, and the type is shown in figure 2.
The overall rigidity and the tower weight of the iron tower are directly influenced by the width of the upper opening and the lower opening of the tower body. The smaller the opening width is, the smaller the rigidity of the tower head is, the larger the displacement and deformation of the tower head are, the larger the internal force of the main material of the tower body of the head part is, the tower weight is naturally increased, and otherwise, the tower weight is reduced; along with the continuous increase of the opening width of the iron tower, the iron tower is heavier and heavier, so that the opening width which is most suitable is reduced as much as possible under the condition of ensuring the integral rigidity of the iron tower, so that the bearing potential of the component is fully utilized, and the aim of lightest tower weight is fulfilled. When the span tower mouth width is changed between 5.0m and 7.0m, the self rigidity of the tower meets the requirement, so that the tower mouth width value of the large-span straight line is 6.0m according to the optimal principle of the tower weight.
The pole tower gradient is determined to be crucial, when the opening width is fixed, the gradient of the tower body is smaller, the inclined material of the iron tower is shortened, the internal force of the corresponding inclined material is also reduced, the weight of the inclined material is lightened, the internal force of the main material of the iron tower is increased, and the specification of the main material is correspondingly increased. On the contrary, the larger the gradient of the tower body is, the smaller the internal force of the main material of the tower body is, and the specification of the main material is correspondingly reduced, but at the moment, the length of the inclined material of the iron tower is increased, and the specification is increased.
In addition, the determination of the gradient of the tower is very important, when the opening is wide for a certain time, the gradient of the tower body is smaller, the inclined material of the iron tower is shortened, the internal force of the corresponding inclined material is also reduced, the weight of the inclined material is lightened, the internal force of the main material of the iron tower is increased, and the specification of the main material is correspondingly increased. On the contrary, the larger the gradient of the tower body is, the smaller the internal force of the main material of the tower body is, and the specification of the main material is correspondingly reduced, but at the moment, the length of the inclined material of the iron tower is increased, and the specification is increased. The change of the gradient of the tower body not only determines the weight of the tower and the acting force of the foundation, but also influences the span and the span tower height through the root opening. Because the position of the crossing tower is controlled by the distance from the tower position to the dike foot, the larger the iron tower is opened, the tower position must be moved outwards to meet the requirement, the crossing span must be increased, and the tower call height is increased. On the contrary, the root opening of the iron tower is too small, the span and the pitch of the tower can be improved, but the amplitude of the pitch reduction cannot offset the effect of the root opening reduction on the increase of the tower weight, so that the reasonable determination of the gradient of the span tower is particularly important. When the gradient of the upper variable slope is 7.4-7.6% and the gradient of the lower variable slope is 11%, the tower weight index is the lowest. Although the acting force is not the lowest at this time, the change of the acting force does not affect the foundation engineering quantity considering that the foundation crossing of the yellow river is mainly controlled by the calculated outcrop, so that the slope gradient of the upper part of the crossing tangent tower is 7.5 percent, and the slope gradient of the lower part of the crossing tangent tower is 11 percent.
Example 2
As shown in fig. 1-2, this embodiment provides an extra-high voltage direct current large-span tangent tower, which is an improvement on the basis of embodiment 1: the included angle between the web members of the tower body and the main material is 40-50 degrees.
The tower body web members are arranged at the position with a smaller section and adopt crossed cloth materials, so that the tower body web members are stressed clearly and have simple force transmission; at the larger part of the tower body section, because the length of the sections is larger, the length of the inclined material is correspondingly larger, and the length-to-fineness ratio is also inevitably larger, most of the inclined material is stably controlled, and in order to fully exert the strength of the material, a positive K material distribution mode is adopted between the sections at the larger part of the tower body section, so that the rigidity of the whole tower is increased, and the height of the sections can be increased. The included angle between the web member and the main material is 40-50 degrees, the stress of the diagonal material of the web member is small, and the stress of the diagonal material of the whole tower body is uniform. Meanwhile, due to the arrangement mode, the gap of the tower body is increased, the web member material is saved, the cross section of the web member is reduced, the wind shielding area is reduced, the wind load of the tower body is correspondingly reduced, the internal force of the component is reduced, and the arrangement mode has obvious significance for reducing the steel index.
The length-to-fineness ratio of the steel tube tower is 35-45 division main material joints, and the length-to-fineness ratio is optimal if the length-to-fineness ratio can be controlled within 40, but a degree of desire is properly left in consideration of the influence of the bending moment of the rod end.
The connection between the main materials of the tower body mainly adopts rigid flanges, and the rigid flanges have high node rigidity and reliable connection, thereby being beneficial to the integral stability of the large-span section iron tower; the connection of the main material of the cross arm of the lead and the main material of the tower body, and the connection of the inclined material with larger stress and the main material mainly adopt the intersecting connection, and have large rigidity and bearing capacity; the connection of the common inclined material and the auxiliary material mainly adopts a plugboard, so that the processing is convenient, and the installation is easier.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The utility model provides an extra-high voltage direct current strides across tangent tower greatly which characterized in that: comprises a tower body, a tower head arranged at the upper part of the tower body and tower legs arranged at the lower part of the tower body; the tower head is of a spread-wing type and comprises a lead cross arm and a ground wire bracket arranged on the lead cross arm; the ground wire bracket is of a triangular outer suspension structure; the tower body slope changing part, the section part directly subjected to torsion and the section parts at the top of the tower and the top of the tower legs are all provided with transverse partition surfaces.
2. An extra-high voltage direct current large-span tangent tower as claimed in claim 1, wherein: the width of the tower body opening is 5-7 m.
3. An extra-high voltage direct current large-span tangent tower as claimed in claim 1, wherein: the gradient of the upper part of the tower body is 7.4-7.6%, and the gradient of the lower part is 11%.
4. An extra-high voltage direct current large-span tangent tower as claimed in claim 3, wherein: the included angle between the web members of the tower body and the main material is 40-50 degrees.
5. An extra-high voltage direct current large-span tangent tower as claimed in claim 4, wherein: the spacing between the transverse partition surfaces is not more than 25 m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022430013.6U CN213742622U (en) | 2020-10-28 | 2020-10-28 | Extra-high voltage direct current large-span tangent tower |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022430013.6U CN213742622U (en) | 2020-10-28 | 2020-10-28 | Extra-high voltage direct current large-span tangent tower |
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| CN213742622U true CN213742622U (en) | 2021-07-20 |
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| CN202022430013.6U Active CN213742622U (en) | 2020-10-28 | 2020-10-28 | Extra-high voltage direct current large-span tangent tower |
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