Design method for long-distance overhead power vestibule structure in industrial park

Abstract

The invention relates to a design method of a long-distance overhead power vestibule structure in an industrial park, which comprises the following steps: determining cable support arrangement, maintenance channel width and cabin arrangement according to cable voltage class and loop number, and completing cross section scheme design; overhead power vestibule plane path line selection is carried out, wherein a plane path comprises a straight line section and a bent section; according to the crossing condition along the path, the clearance height requirement below the whole-line corridor body structure is determined, and the vestibule longitudinal section elevation design is completed; in combination with a plane path and a longitudinal section, arrangement and arrangement of a whole-line corridor body structure and a supporting structure are completed, and the corridor body structure and the supporting structure form are properly merged according to the overall situation of a line; and designing a corridor body enclosure structure and vestibule ancillary facilities. According to the method, the multiple sections of vestibules are planned in the whole process, the vestibule span is merged in a standardized mode, and design and lofting machining are facilitated; the overhead pipe gallery has a flexible turning function, so that the vestibule conforms to the path trend.

Description

Technical Field

[0001] The present invention relates to the technical field of power cable pipe galleries, and specifically relates to a design method for a long-distance overhead power corridor structure in an industrial park. Background Art

[0002] In an industrial park, a large number of energy supply pipelines need to be equipped for industrial plants. The underground pipe gallery structure is easily restricted by underground structures, surrounding buildings, etc. The conflicts between the pipe gallery structure and underground pipelines such as gas, oil transportation, drainage, and heating pipelines, as well as structures such as pile foundations and retaining walls, make the construction difficult, requiring large-scale demolition and reconstruction, with high costs and low efficiency. Therefore, currently, most parks have changed the original underground integrated power pipe gallery to overhead installation. Different energy supply pipelines such as medium-voltage power cables, communication cables, and water supply pipelines can be laid in the pipe gallery to meet the relevant needs within the factory scope of the industrial park.

[0003] Patent document CN115012296 A discloses an open-type overhead power cable pipe gallery structure, including at least two pier columns arranged above the ground, a capping beam arranged at the top of the pier columns, at least two longitudinal beams arranged on the capping beam, cable brackets arranged on the side walls of the longitudinal beams for supporting cables, a ceiling arranged at the top of the longitudinal beams, and pile foundations arranged below the ground for supporting the pier columns. However, the main structure of the above pipe gallery structure adopts a concrete structure. The structural pier columns need to be formwork-supported, poured, and cured on-site, with a long overall period, a relatively high beam height, being greatly affected by wind loads, having poor lateral stiffness, the overall concrete structure being heavy, being not conducive to the appearance beauty, and having poor permeability.

[0004] It can be seen that the current overhead power corridor has a long overall construction period, a small number of cable laying circuits, a short distance, and its corridor body path is in a straight line form and cannot turn, making it difficult to conform to the tortuous transmission line path. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a design method for a long-distance overhead power corridor structure in an industrial park to solve the above problems.

[0006] The present invention provides the following technical solutions:

[0007] A design method for a long-distance overhead power corridor structure in an industrial park, comprising the following steps:

[0008] Step S1, determine the cable bracket layout, maintenance passage width, and chamber layout according to the cable voltage level and the number of circuits, and complete the cross-sectional plan design;

[0009] Step S2, select the plane path of the overhead power corridor. The plane path includes straight sections and curved sections;

[0010] Step S3: Determine the clearance height requirements below the entire corridor body structure based on the crossing and spanning conditions along the path, and complete the elevation design of the corridor longitudinal section;

[0011] Step S4: Combine the plane path and the longitudinal section to complete the arrangement of the entire corridor body structure and the support structure. Appropriately merge the types of the corridor body structure and the support structure according to the overall line conditions;

[0012] Step S5: Conduct the design of the corridor enclosure structure;

[0013] Step S6: Conduct the design of the corridor auxiliary facilities.

[0014] Furthermore, the cable support arrangement described in Step S1 includes determining the cable support length, number of layers, layer spacing, and longitudinal spacing.

[0015] Furthermore, the compartment arrangement described in Step S1 includes the compartment size and quantity.

[0016] Furthermore, the support structure types on both sides of the inflection point of the bending section in Step S2 are determined by the size of the corridor turning angle.

[0017] Furthermore, when the turning angle n of the corridor at the turning point ≤ the preset value, the support structures on both sides of the inflection point of the bending section are space supports. Keep the position of the space supports unchanged, and realize the turning above the space supports. The corridor on the left side of the inflection point rotates clockwise by 0.5n° with the midpoint of the left cross beam of the space support as the rotation point, and the corridor on the right side of the inflection point rotates counterclockwise by 0.5n° with the midpoint of the right cross beam of the space support as the rotation point. The preset value is determined according to the diameter of a single circular pipe column below the space support.

[0018] Furthermore, when the turning angle n of the corridor at the turning point > the preset value, the support structure types on both sides of the inflection point of the bending section are plane supports. The adjacent plane supports on both sides are arranged at the required angle, and the ends of the corridors on both sides are supported on their respective plane supports. The center distance between two adjacent circular pipe columns of the plane supports on both sides of the inflection point should be greater than or equal to 3 times the pile diameter, and the pile diameter is the diameter of the pile foundation below the circular pipe column of the plane support.

[0019] Furthermore, the corridor body structure includes a standard section, a first and last section, a crossing and spanning section, and a slope section.

[0020] Furthermore, the slopes of the first and last sections and the slope section are 10° - 16°.

[0021] Furthermore, the corridor body structure is in the form of a vertical truss, and the vertical truss form adopts a support form of cross plus vertical web members.

[0022] Furthermore, the bending radius at the turning of the corridor body structure should be greater than or equal to the maximum value of the minimum allowable bending radius of the cables laid in the corridor body.

[0023] The present invention has the following beneficial technical effects:

[0024] The present invention conducts overall planning for multiple-section corridors, and the layout meets the requirements of the whole line; standardizes and merges the corridor spans, which is conducive to design and lofting processing. The corridor truss is hoisted by steel structure, with high construction efficiency and significantly shortened construction period. By reasonably designing the number of cabins and the cross-sectional size, the overhead corridor structure can intensively lay multiple high-voltage cables.

[0025] The overhead pipe gallery of the present invention has a flexible turning function, and can determine the appropriate turning method according to the turning angle, that is, select the supporting structure (space bracket or plane bracket) through the angle, so that the corridor conforms to the path trend. This method realizes the design of fine turning with small angles and overall turning with large angles of the corridor structure by controlling the turning angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic cross-sectional structure diagram of a single cabin of the present invention;

[0027] Figure 2 is a schematic cross-sectional structure diagram of a double cabin of the present invention;

[0028] Figure 3 is a longitudinal section layout diagram of the connection between the first-span section and the connection well of the present invention;

[0029] Figure 4 is a longitudinal section layout diagram of the standard section of the present invention;

[0030] Figure 5 is a layout diagram of the enclosure board of the standard section of the present invention;

[0031] Figure 6 is an enlarged view of the supporting structure at the turning of the plane path of the corridor body of the present invention;

[0032] Figure 7 is Figure 6 the 1-1 sectional view in;

[0033] Figure 8 is a schematic diagram of the turning design when the turning degree of the plane path of the corridor of the present invention is equal to 6°;

[0034] Figure 9 is a top view of the corridor body structure when the turning degree of the plane path of the corridor of the present invention is equal to 6°;

[0035] Figure 10 is a schematic diagram of the turning design when the turning degree of the plane path of the corridor of the present invention is greater than 6°;

[0036] Figure 11 is a top view of the corridor body structure when the turning degree of the plane path of the corridor of the present invention is greater than 6°.

[0037] The reference numerals in the figure are as follows:

[0038] 1. Corridor; 2. Bracket; 3. Cable bracket; 4. Maintenance passage; 5. Space bracket; 6. Planar bracket; 7. Bolt hole; 8. Inflection point; 9. Column; 10. Circular pipe column; 11. Top plate; 12. Bottom plate; 13. Manual operation hole. Specific implementation manner

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] Embodiment

[0041] A design method for a long-distance overhead power corridor in an industrial park includes the following steps:

[0042] Step S1: Determine the layout of the cable bracket 3, the width of the maintenance passage 4, the size of the cabin, and the number of cabins according to the cable voltage level and the number of circuits, and complete the design of the cross-sectional plan;

[0043] See the attached Figure 1-2 In the figure, the basic structure diagrams of the cross-sections of single-cabin and double-cabin are respectively shown. The upper part is the corridor 1, and the lower part is the bracket 2. The layout of the cable bracket 3 described in step S1 includes determining the length, number of layers, layer spacing, and longitudinal spacing of the cable bracket 3; when the cable bracket 3 is arranged on one side of the corridor body, the net width of the maintenance passage should not be less than 0.9 m, and when the cable bracket 3 is arranged on both sides of the corridor body, the net width of the maintenance passage 4 should not be less than 1.0 m; for the convenience of subsequent maintenance, the internal clear height in the corridor body should be 2 - 3 m; when a single cabin cannot meet the requirements of the number of cable circuits, forms such as double-cabin and triple-cabin can be adopted; the form of the bracket 2 of a single cabin can be cross-shaped, and the bracket 2 of a double cabin can be in a herringbone shape.

[0044] Step S2: Select the plane path of the overhead power corridor. The path of the transmission line should meet the safety distance requirements from relevant equipment in the park. Among them, the plane path of the power corridor in this embodiment includes straight sections and curved sections;

[0045] Step S3: According to the cross-over situation along the path, collect information from relevant management units. On the basis of obtaining written permission and meeting the requirements of relevant specifications, determine the clear height requirements below the structure of the whole-line corridor body, and complete the design of the longitudinal section elevation of the corridor;

[0046] Among them, the clear height below the corridor body structure described in step S3 is the clear distance between the lower edge of the corridor body structure and the structures such as roads, waters, river channels, and ground pipelines directly below it, and shall meet the requirements of the relevant management units in the park. According to the longitudinal section conditions of the whole line, the design height of the support structure is determined;

[0047] Step S4: Combine the plane path selection and longitudinal section design to complete the arrangement of the corridor body structures and support structures along the whole line, and appropriately merge the types of corridor body structures and support structures according to the overall situation of the line;

[0048] In this embodiment, the types of corridor body structures and support structures are planned. The corridor body structures include standard sections, first and last sections, crossover sections, and slope sections;

[0049] See the appendix Figure 3-4 , the span of the standard section described in step S4 is an economic span section, Figure 3 It shows that the first and last sections are used to connect the connection wells and the overhead power corridor, and the recommended slope should be 10° - 16°, Figure 4 It shows the standard section. The crossover section is used to cross structures such as park roads, waters, and river channels. The slope section is used to connect the cases where the top surface heights of the front and rear support structures are inconsistent, and the slope should be 10° - 16°. The corridor body span should be 18m - 48m, which is a multiple of 3m. The height of the support structure should be 5.5 - 6.5m. The height of the support structure for crossing the sidewalk and non-motor vehicle lane section is 5.5m, and the height of the support structure for crossing the road section is 6.5m, meeting the requirements of the "Urban Road Engineering Design Code". When there are additional requirements in the park, the corridor body structure and the support structure should be specially designed.

[0050] The support structure includes a plane support 6 and a space support 5. The plane support 6 is usually composed of two or more circular pipe columns 10 in a plane, and its longitudinal stiffness along the path is poor. The space support 5 is composed of multiple plane supports 6. Using the space support 5 can better withstand the longitudinal temperature stress and seismic effects, so a space support 5 should be arranged every few spans; the component arrangement of the corridor body structure and the support structure is completed through structural calculation.

[0051] In this embodiment, the corridor body structure described in step S4 is a space truss structure. See the appendix Figure 3-4 , the vertical main truss and the plane support on the upper (lower) chord of the vertical main truss adopt a support form of cross plus vertical bars. In addition to meeting the force requirements, the arrangement spacing of the main truss vertical bars also fixes the cable brackets. The spacing should be 1.5m, which can meet the allowable span requirements of 110kV and 220kV cable brackets. The inclination angle of the diagonal web members should be 45° - 60°.

[0052] The merged corridor body structure and support structure type described in step S4 are for facilitating factory standardized production, improving construction efficiency, and enabling the size merging of corridor body structures and support structures with similar geometric dimensions. Considering the line fire prevention zones and escape routes, the span structures and column layouts of special sections such as cross-overs are carried out first, and then the corridor layouts of the remaining sections are carried out. The remaining sections preferably adopt standard sections, and for those parts where standard sections cannot be used locally, the connection can be completed in the form of cantilever butt joints. The cantilever butt joint is a conventional technical means in the field of building construction and will not be elaborated here.

[0053] Step S5: Design the corridor enclosure structure, including the roof, side walls, and passageway.

[0054] In this embodiment, the roof slab in step S5 uses profiled steel sheets, and the photovoltaic panels are fixed on the roof slab using clamps. The photovoltaic power generation provides green energy for the auxiliary facilities inside the corridor. Refer to the appendix Figure 5 For the two side walls, perforated aluminum plates are used to facilitate natural lighting and natural ventilation. The passageway preferably uses patterned steel plates, which can prevent the items inside the corridor from falling and getting lost, and at the same time avoid the danger of objects falling and endangering the safety of vehicles and pedestrians on the road below.

[0055] Step S6: Design the auxiliary facilities of the corridor, including escape routes, signs, power lighting, fire alarms, gas monitoring, lightning protection, and grounding.

[0056] Among them, the design of the auxiliary facilities described in step S6 can refer to the design of the auxiliary facilities of conventional underground cable tunnels.

[0057] In this embodiment, the bending section of the plane path in step S2 is set to turn at the position where the support structure is provided in the cross-section. For the structure at the support structure, refer to the appendix Figure 6 Above the support structure, there is a top plate 11, and four bolt holes 7 are opened on the top plate 11. The corridor column 9 is located above the support structure, and a bottom plate 12 is also provided below the corridor column 9. Four corresponding bolt holes 7 are also opened on the bottom plate 12. The fixation between the support structure and the upper corridor column 9 is achieved through the bolt holes between the top plate 11 and the bottom plate 12. There is an operating hole 13 on the round pipe column 10. The operating hole 13 is located about 150 mm below the top plate 11, and the diameter of the operating hole 13 is about 100 mm, which is used for passing bolts. After the bolts are installed, the operating hole 13 is closed. For the specific turning setting, refer to the appendix Figure 6-9 .

[0058] The support structure types on both sides of the inflection point 8 of the bending section in step S2 are determined by the turning angle of the corridor; when the turning angle n at the corridor turning point ≤ the preset value, refer to the appendix Figure 6-9, at this time, the turning angle is small, and it is possible to choose to achieve the turning on the supporting structure which is the space bracket 5. At this time, the turning can be achieved only above the supporting structure which is the space bracket 5. The intersection point of the central axes of the two side corridors is the path inflection point 8. The left corridor of the inflection point 8 rotates clockwise by 0.5n° with the midpoint of the left cross beam of the space bracket 5 as the rotation point, and the right corridor of the inflection point 8 rotates counterclockwise by 0.5n° with the midpoint of the right cross beam of the space bracket 5 as the rotation point, so as to achieve a rotation of n°. The preset value is determined according to the diameter of a single round pipe column 10 under the space bracket. For example, in this embodiment, the diameter of a single round pipe column 10 is 630 mm, and the preset value n is taken as 6°. When the turning angle n ≤ the preset value, all the bolt holes 7 on the bottom plate 12 are inside the cavity of the round pipe column 10 on the top plate 11, and the diameter of the round pipe column 10 is closely related to the turning angle. The larger the diameter, the larger the turning angle that the corridor can achieve. Figure 8 The turning design when the turning angle of the corridor path is 6° is shown.

[0059] When the turning angle n of the corridor turning point > the preset value, refer to the appendix Figure 10-11 , at this time, the turning angle is large, and it is possible to choose to achieve the turning on the supporting structure which is the plane bracket 6. At this time, the ends of the two side corridors at the inflection point 8 are supported on their respective plane brackets 6, and the adjacent plane brackets 6 of the two side corridors are arranged at the required angle, and it is ensured that the center distance of the round pipe columns 10 of the two nearest plane brackets meets 3 times or more of the foundation pile diameter. The pile diameter is the diameter of the pile foundation under the round pipe column 10 of the plane bracket. When it is other foundation forms, the relevant requirements for the foundation spacing in the relevant specifications should be met.

[0060] In this embodiment, the bending radius at the turning of the corridor body structure should not be less than the maximum value of the minimum allowable bending radius of the cables laid therein.

[0061] The overhead power corridor of the present invention can realize the intensive layout of cables, save the corridor, reduce the construction period, be green and energy-saving. The design method has clear logic and perfect theory, which not only improves the work efficiency of designers, but also makes the design of the steel corridor structure more reasonable, ensures the safe operation of cables, and further guarantees the power supply reliability of the overhead cable transmission line.

[0062] The above-described embodiments only represent the specific implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A design method for a long-distance overhead power corridor structure in an industrial park, characterized in that: The following steps are involved: Step S1, determine the cable support layout, maintenance channel width, and cabin layout according to the cable voltage level and the number of loops, and complete the cross-section design; Step S2, selecting a plane path for the overhead power corridor, where the plane path includes a straight line segment and a curved segment; Step S3, according to the crossing and spanning conditions along the route, determine the clearance height requirement under the corridor structure of the entire line, and complete the elevation design of the longitudinal section of the corridor; Step S4, combining the plane path and the longitudinal section, completing the arrangement and layout of the corridor body structure and the supporting structure of the entire line, and appropriately merging the corridor body structure and the supporting structure type according to the overall situation of the line; Step S5, designing the corridor enclosure structure; Step S6, designing the corridor ancillary facilities.

2. The design method of a long-distance overhead power corridor structure in an industrial park according to claim 1 is characterized in that: The cable support arrangement described in step S1 includes determining the cable support length, number of layers, layer spacing and longitudinal spacing.

3. The design method of a long-distance overhead power corridor structure in an industrial park according to claim 1 is characterized in that: The cabin arrangement described in step S1 includes the size and quantity of the cabins.

4. The design method of a long-distance overhead power corridor structure in an industrial park according to claim 1 is characterized in that: The type of supporting structures on both sides of the turning point of the curved section in step S2 is determined by the turning angle of the corridor.

5. The design method of a long-distance overhead power corridor structure in an industrial park according to claim 4 is characterized in that: When the turning angle n at the corridor turning point is ≤ the preset value, the supporting structures on both sides of the turning point of the curved section are space supports. The position of the space supports is kept unchanged, and the turning is realized above the space supports. The corridor on the left side of the turning point rotates 0.5n° clockwise with the midpoint of the left beam of the space support as the rotation point, and the corridor on the right side of the turning point rotates 0.5n° counterclockwise with the midpoint of the right beam of the space support as the rotation point. The preset value is determined according to the diameter of a single circular tube column below the space support.

6. The design method of a long-distance overhead power corridor structure in an industrial park according to claim 5 is characterized in that: When the turning angle n at the corridor turning point is greater than the preset value, the supporting structure type on both sides of the turning point of the curved section is a plane support, the adjacent plane supports on both sides of the turning point are arranged at the required angle, and the ends of the corridors on both sides are supported on their own plane supports, and the center distance between two adjacent circular tube columns of the plane supports on both sides of the turning point should be greater than or equal to 3 times the pile diameter, and the pile diameter is the pile foundation diameter under the circular tube column of the plane support.

7. The design method of a long-distance overhead power corridor structure in an industrial park according to claim 6 is characterized in that: The corridor structure includes standard section, first and last sections, crossing section and slope section.

8. The design method of a long-distance overhead power corridor structure in an industrial park according to claim 6 is characterized in that: The slopes of the first and last sections and the slope section are between 10° and 16°.

9. The design method of a long-distance overhead power corridor structure in an industrial park according to claim 1 is characterized in that: The corridor structure is in the form of a vertical truss, which is supported by a cross and vertical web.

10. The design method of a long-distance overhead power corridor structure in an industrial park according to claim 1 is characterized in that: The bending radius at the turning point of the corridor structure should be greater than or equal to the maximum value of the minimum allowable bending radius of the cables laid in the corridor.

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