CN219219095U - Composite spiral anchor foundation for improving anti-overturning capacity of power transmission steel pipe pole - Google Patents
Composite spiral anchor foundation for improving anti-overturning capacity of power transmission steel pipe pole Download PDFInfo
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- CN219219095U CN219219095U CN202223171021.9U CN202223171021U CN219219095U CN 219219095 U CN219219095 U CN 219219095U CN 202223171021 U CN202223171021 U CN 202223171021U CN 219219095 U CN219219095 U CN 219219095U
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Abstract
The utility model discloses a composite screw anchor foundation capable of improving the anti-overturning capacity of a steel pipe pole in power transmission, which comprises a main screw anchor, wherein a plurality of satellite screw anchors are arranged at the upper end of the main screw anchor at intervals along the circumferential direction, a connecting steel beam is arranged between the main screw anchor and the satellite screw anchor, the connecting steel beam is hinged with a satellite screw anchor bracket, and a connecting flange connected with an upper steel pipe pole is arranged at the top of the main screw anchor. The overturning moment and the horizontal force of the power transmission steel pipe rod are transmitted to the main screw anchor by the connecting flange and are jointly born by the main screw anchor and the satellite screw anchor. Because the space between the satellite spiral anchors is increased and the satellite spiral anchors are arranged in an inclined way, the anti-overturning bearing capacity and the corresponding basic rigidity of the main spiral anchors provided by the upward pulling, downward pressing and horizontal bearing capacity of the main spiral anchors are greatly improved, so that the problems of insufficient anti-overturning bearing capacity and overlarge lateral deformation of the steel pipe rod during single spiral anchor basic design are effectively solved.
Description
Technical Field
The utility model relates to the technical field of power transmission line foundations, in particular to a composite spiral anchor foundation for improving anti-overturning capacity of a power transmission steel pipe pole.
Background
The power transmission line is a carrier for electric energy transmission in a power system, and in the construction of the power transmission line, the steel pipe pole is an important framework structure, and compared with the traditional iron tower structure, the steel pipe pole has the advantages of high stability, small occupied area, good attractiveness and the like, is suitable for the same pole erection of multiple loops with different voltage levels, and is widely applied to urban overhead power transmission lines of 110 kV and 220 kV. Although the steel pipe pole has a plurality of advantages, because of the structure towering, a larger overturning moment exists under the wind load and the earth wire load, and the steel pipe pole overturning accident occurs.
At present, the steel pipe pole foundation type mainly comprises a block foundation, a concrete pile foundation, a steel pipe pile foundation, a spiral anchor foundation and the like, wherein the spiral anchor foundation is widely popularized and applied by a national power grid in recent years due to the advantages of convenience and rapidness in construction, low manufacturing cost and the like. However, the foundation type has the problems of insufficient rigidity and larger deformation of the foundation under the action of overturning load in coastal soft soil areas. In order to ensure the safety of the upper structure of the transmission line, the lower foundation is controlled to have horizontal displacement within 10-15 mm under the action of load, and the deformation control target is difficult to achieve in soft soil areas by adopting a conventional screw anchor foundation at present.
In order to solve the problem that the bearing capacity and deformation control of a conventional spiral anchor foundation of a steel pipe pole are insufficient under the overturning load, the application provides a composite spiral anchor foundation for improving the anti-overturning capacity of the steel pipe pole through power transmission.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a composite spiral anchor foundation for improving the anti-overturning capacity of a steel pipe rod in power transmission, which solves the problems of overlarge overturning moment and insufficient anti-deformation capacity of a lower foundation of the steel pipe rod under the action of wind load and ground wire load.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a compound spiral anchor basis of transmission of electricity promotion steel pipe pole anti-capsizing ability, includes main spiral anchor, the upper end of main spiral anchor is provided with a plurality of satellite spiral anchors along circumference interval, main spiral anchor with be provided with the connection girder steel between the satellite spiral anchor, the connection girder steel with satellite spiral anchor support articulates each other, the top of main spiral anchor is provided with the flange of being connected with upper portion steel pipe pole.
The overturning moment and horizontal force of the power transmission steel pipe rod are transmitted to the main screw anchor by the connecting flange and are jointly born by the main screw anchor and the satellite screw anchor. The overturning moment is jointly born by the main screw anchor and the satellite screw anchor, wherein the overturning moment born by the satellite screw anchor is converted into the upward pulling and downward pressing force of the satellite screw anchor, and the satellite screw anchor performs the checking calculation of the upward pulling and downward pressing bearing capacity; the horizontal force is borne by the main screw anchor and the satellite screw anchor, wherein the satellite screw anchor provides the horizontal force by the component of the pulling-up and pressing-down bearing force. The cross-sectional dimension of the connecting steel beam can meet the bending resistance requirement of the connecting steel beam under the overturning moment.
Further, the main screw anchor and the satellite screw anchor comprise three parts, namely an anchor head, an anchor rod and an anchor blade, wherein the anchor rod diameter of the main screw anchor is 500-1000 mm, and the anchor blade diameter of the main screw anchor is 1000-1500 mm; the diameter of the anchor rod of the satellite spiral anchor is 200 mm-500 mm, and the diameter of the anchor leaf is 400 mm-1000 mm.
Further, a plurality of wing plates are arranged along the circumferential direction of the main spiral anchor, and the wing plates are rigidly connected with the connecting steel beam through bolts.
Further, the wing plate of the main screw anchor is perforated, the section size of the wing plate is slightly smaller than that of the connecting steel beam, one side of the connecting steel beam is perforated, and the aperture and the hole site are matched with those on the wing plate.
Further, the connection steel beam is connected with the satellite screw anchor through a hinged joint.
Further, 4-6 satellite screw anchors are arranged around the main screw anchor, and the satellite screw anchors are uniformly distributed around the main screw anchor.
Further, the satellite spiral anchors are obliquely arranged at a certain angle with the vertical direction, and the inclination angle is 15-30 degrees and is used for sharing a part of horizontal force.
Further, the cross beam is arranged in the range of double the diameter of the anchor rod at the top of the anchor rod of the main spiral anchor for reinforcement, the cross beam is 50mm multiplied by 50mm in section, and the anchor rod top is prevented from being buckled and damaged due to concentrated stress.
In summary, the utility model uses the main screw anchor as the center to radially arrange a plurality of satellite screw anchors, the composite screw anchor foundation is connected with the upper steel pipe rod through the connecting flange on the main screw anchor, the main screw anchor is connected with the satellite screw anchor through the connecting steel beam, and the connecting steel beam is hinged with the satellite screw anchor. The overturning moment and horizontal force of the power transmission steel pipe rod are transmitted to the main screw anchor by the connecting flange and are jointly born by the main screw anchor and the satellite screw anchor. Because the space between the satellite spiral anchors is increased and the satellite spiral anchors are arranged in an inclined way, the anti-overturning bearing capacity and the corresponding basic rigidity of the main spiral anchors provided by the upward pulling, downward pressing and horizontal bearing capacity of the main spiral anchors are greatly improved, so that the problems of insufficient anti-overturning bearing capacity and overlarge lateral deformation of the steel pipe rod during single spiral anchor basic design are effectively solved.
Drawings
FIG. 1 is a three-dimensional view of a main helical anchor with wings according to the present utility model;
FIG. 2 is a top view of the main helical anchor with wings of the present utility model;
FIG. 3 is a three-dimensional view of a satellite helical anchor according to the present utility model;
FIG. 4 is a three-dimensional view of the connecting steel beams of the present utility model;
fig. 5 is a three-dimensional view of the composite helical anchor foundation of the present utility model.
Labeling and describing: 1. a connecting flange; 2. a main screw anchor; 3. a satellite helical anchor; 4. connecting the steel beams; 5. a wing plate; 6. a hinged joint; 7. a bolt; 8. a cross beam.
Detailed Description
A further description of an embodiment of a composite helical anchor foundation for enhancing the anti-capsizing ability of a power transmission steel pipe pole according to the present utility model will be provided with reference to fig. 1 to 5.
Referring to fig. 5, which shows a three-dimensional view of a composite screw anchor foundation, the composite screw anchor foundation according to the present embodiment includes a connection flange 1, a main screw anchor 2, a satellite screw anchor 3, and a connection steel beam 4. The satellite screw anchor 3 takes the main screw anchor 1 as the center and is radially and evenly distributed at intervals, one end of a connecting steel beam 2 is connected with a wing plate 5 of the main screw anchor 1 through a bolt 7, the other end of the connecting steel beam is hinged with the satellite screw anchor 3 through a hinged joint 6, the satellite screw anchor 3 is obliquely arranged at a certain angle with the vertical direction, and a cross beam 8 is arranged at the top 1 of the anchor rod of the main screw anchor 1 to strengthen (as shown in figure 2).
The parameters of a certain southeast coastal soft soil stratum are shown in the following table, the annual average groundwater level is-0.5 m, and the highest groundwater level can reach 0m. The tower type of a certain transmission line is SGJ1, the calling height is 21m, the outer diameter of the tower is 1.61m, and the outer diameter of a lower flange is 2.12m. The foundation is subjected to a downward load of 267kN, a horizontal load of 211kN, and a bending moment of 5207 kN.m. Because the bending moment born by the foundation, namely the overturning moment, is overlarge, the single foundation form is difficult to meet the requirement of bearing capacity, and therefore the composite screw anchor foundation is arranged.
And 1 main screw anchor 2 and 4 satellite screw anchors 3 (shown in fig. 1 and 3) are arranged below each pole tower to form a composite screw anchor foundation. The inclination angle of the satellite screw anchor 3 is 30 degrees, the connecting steel beams 4 are in box girder forms (shown in fig. 4), the total number of the connecting steel beams is 4, the length, the width and the height of each box girder are respectively 1.5m, 0.15m and 0.2m, the wall thickness is 10mm, and the screw anchor and the box girders are all made of Q355 steel. The connecting flange 1 is matched with a flange plate at the lower part of the tower, the outer diameter of the connecting flange 1 is 2.12m, the diameter of bolt holes is 64mm, and the number of the bolt holes is 24.
TABLE 1 physical mechanical parameters of the formation
Note that: in the tablemIs the proportionality coefficient of the horizontal resistance coefficient of foundation soil.
The main screw anchor 2 is provided with three anchor discs, the embedded depth is-4 m, -8m and-10 m respectively, the diameter of the anchor disc is 500mm, the diameter of the anchor disc is 1000mm, the length, width and height of the steel cross beam 8 are 50mm, 50mm and 1000mm respectively, the wall thickness of the anchor disc and the thickness of the anchor disc are 12mm, and the screw pitch of the anchor disc is 100mm. According to the bearing capacity calculation formulas provided by the overhead transmission line spiral anchor basic design specification Q/GDW 10584-2022 and the overhead transmission line basic design technical specification DL/T5219-2014, the main spiral anchor 2 is calculated to have a pressing bearing capacity value of 1005.5kN, a horizontal bearing capacity value of 114.96kN and an anti-overturning bearing capacity value of 4301 kN.m. The calculation result shows that the pressing bearing capacity meets the requirement, the horizontal and anti-overturning bearing capacity does not meet the requirement, and therefore the part of load is needed to be borne by the satellite screw anchor 3.
The satellite spiral anchor 3 is provided with 3 anchor discs, the embedded depth is-1.25 m, -2m and-2.75 m respectively after being inclined by 30 degrees along the vertical direction, the diameter of the anchor rod is 300mm, the diameter of the anchor disc is 600mm, the length of the anchor rod is 6m, the anchor discs are respectively positioned at the positions of-2.5 m, -4.0m and-5.5 m at the top of the anchor rod, the wall thickness of the anchor rod and the thickness of the anchor disc are both 12mm, and the pitch of the anchor disc is 100mm. According to the calculation formula in the specification, each satellite screw anchor 3 can provide a pull-up bearing force 461.9kN and a push-down bearing force 629.2kN in the oblique direction. The component forces of the pulling-up bearing force along the vertical direction and the horizontal direction are 230.9kN and 230.9kN respectively, and the component forces of the pushing-down bearing force along the vertical direction and the horizontal direction are 544.9kN and 314.6kN respectively. Therefore, the horizontal bearing force provided by the pair of satellite screw anchors 3 is the horizontal component force of the pulling-up bearing force and the pressing-down bearing force, namely 545.5kN, and the anti-capsizing force provided by the vertical product of the pulling-up bearing force and the pressing-down bearing force and the length of the box girder, namely 1417 kN.m.
The side box girder may also provide a partial overturning resistance, which may be calculated according to the formula related to the building foundation design Specification GB50007-2011, which is herein taken as a safety preparation, when subjected to an overturning force.
Under the least unfavorable load angle, namely, the horizontal force and the bending moment are in the same direction as the direction of a certain pair of satellite screw anchors 3, the two component forces can not be decomposed and respectively born by the two pairs of satellite screw anchors 3. At this time, only one pair of satellite screw anchors 3 can provide horizontal and overturning resistance, the horizontal bearing capacity provided by the composite screw anchor is 661.1kN, the overturning bearing capacity is 5718.1 kN.m, and the horizontal load 211kN and the overturning moment 5207 kN.m which are respectively larger than the horizontal load to be borne by a foundation are respectively needed, so that the stress requirement is met.
The above description is only a preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above examples, and all technical solutions belonging to the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that modifications and adaptations to the present utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.
Claims (8)
1. The utility model provides a promote compound spiral anchor basis of transmission of electricity steel pipe pole anti-capsizing ability which characterized in that: including main screw anchor, the upper end of main screw anchor is provided with a plurality of satellite screw anchors along circumference interval, main screw anchor with be provided with the connection girder steel between the satellite screw anchor, the connection girder steel with satellite screw anchor support articulates each other, the top of main screw anchor is provided with the flange of being connected with upper portion steel pipe pole.
2. The composite helical anchor foundation for improving the anti-capsizing capability of a power transmission steel pipe pole according to claim 1, wherein: the main screw anchor and the satellite screw anchor comprise three parts, namely an anchor head, an anchor rod and an anchor blade, wherein the anchor rod diameter of the main screw anchor is 500-1000 mm, and the anchor blade diameter is 1000-1500 mm; the diameter of the anchor rod of the satellite spiral anchor is 200 mm-500 mm, and the diameter of the anchor leaf is 400 mm-1000 mm.
3. The composite helical anchor foundation for improving the anti-capsizing capability of a power transmission steel pipe pole according to claim 1, wherein: a plurality of wing plates are arranged along the circumference of the main spiral anchor, and the wing plates are rigidly connected with the connecting steel beam through bolts.
4. A composite helical anchor foundation for improving the anti-capsizing capability of a steel transmission pipe pole according to claim 3, wherein: the pterygoid lamina of main spiral anchor punches and the cross-section size is slightly less than the cross-section size of connecting the girder steel, and one side of connecting the girder steel punches, and aperture and hole site and the aperture and the hole site phase-match on the pterygoid lamina.
5. The composite helical anchor foundation for improving the anti-capsizing capability of a power transmission steel pipe pole according to claim 1, wherein: the connecting steel beam is connected with the satellite screw anchor through a hinged joint.
6. The composite helical anchor foundation for improving the anti-capsizing capability of a power transmission steel pipe pole according to claim 1, wherein: and 4-6 satellite screw anchors are arranged around the main screw anchor, and the satellite screw anchors are uniformly arranged around the main screw anchor.
7. The composite helical anchor foundation for improving the anti-capsizing capability of a power transmission steel pipe pole according to claim 6, wherein: the satellite spiral anchors are obliquely arranged at a certain angle with the vertical direction, and the inclination angle is 15-30 degrees.
8. The composite helical anchor foundation for improving the anti-capsizing capability of a power transmission steel pipe pole according to claim 1, wherein: and a cross beam is arranged in the range of double the diameter of the anchor rod at the top of the anchor rod of the main spiral anchor for reinforcement, and the cross beam is 50mm multiplied by 50mm in section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223171021.9U CN219219095U (en) | 2022-11-29 | 2022-11-29 | Composite spiral anchor foundation for improving anti-overturning capacity of power transmission steel pipe pole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223171021.9U CN219219095U (en) | 2022-11-29 | 2022-11-29 | Composite spiral anchor foundation for improving anti-overturning capacity of power transmission steel pipe pole |
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| Publication Number | Publication Date |
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| CN219219095U true CN219219095U (en) | 2023-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223171021.9U Active CN219219095U (en) | 2022-11-29 | 2022-11-29 | Composite spiral anchor foundation for improving anti-overturning capacity of power transmission steel pipe pole |
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| CN (1) | CN219219095U (en) |
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