CN115787703A - 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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- CN115787703A CN115787703A CN202211507625.8A CN202211507625A CN115787703A CN 115787703 A CN115787703 A CN 115787703A CN 202211507625 A CN202211507625 A CN 202211507625A CN 115787703 A CN115787703 A CN 115787703A
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Abstract
The invention discloses a composite spiral anchor foundation for improving the anti-overturning capacity of a steel pipe rod in power transmission, which comprises a main spiral anchor, wherein a plurality of satellite spiral anchors are arranged at the upper end of the main spiral anchor at intervals along the circumferential direction, a connecting steel beam is arranged between the main spiral anchor and the satellite spiral anchors, the connecting steel beam is hinged with a satellite spiral anchor bracket, and a connecting flange connected with the upper steel pipe rod is arranged at the top of the main spiral anchor. The overturning moment and the horizontal force of the power transmission steel pipe pole are transmitted to the main spiral anchor by the connecting flange and are born by the main spiral anchor and the satellite spiral anchor together. Because the space between the satellite spiral anchors is enlarged and the satellite spiral anchors are obliquely arranged, the anti-overturning bearing capacity and the anti-horizontal bearing capacity of the main spiral anchor and the corresponding foundation rigidity provided by the pulling-out, pressing-down and horizontal bearing capacity of the main spiral anchor are greatly improved, so that the problems of insufficient anti-overturning bearing capacity and overlarge lateral deformation of the steel pipe rod in the single spiral anchor foundation design are effectively solved.
Description
Technical Field
The invention relates to the technical field of transmission line foundations, in particular to a composite spiral anchor foundation for improving the anti-overturning capacity of a transmission steel pipe rod.
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 multi-loop same-pole erection with different voltage grades, and is widely applied to 110 and 220kV urban overhead power transmission lines. Although the steel pipe pole has various advantages, the steel pipe pole has a large overturning moment under the action of wind load and ground wire load due to high structure, so that the steel pipe pole is overturned.
At present, the steel pipe pole foundation 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 foundation rigidity and large deformation under the action of overturning load in a coastal soft soil area. In order to ensure the safety of the upper structure of the power transmission line, the horizontal displacement of the lower foundation is controlled within 10 to 15mm under the load action, and the deformation control target is difficult to achieve in a soft soil area by adopting a conventional spiral anchor foundation at present.
In order to solve the problem that the bearing capacity and the deformation control of a conventional spiral anchor foundation of a steel pipe rod are insufficient under the overturning load, the application provides a composite spiral anchor foundation for improving the overturning resistance of the steel pipe rod through power transmission.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a composite spiral anchor foundation for improving the anti-overturning capacity of a steel pipe rod in power transmission, and solves the problems that the steel pipe rod has overlarge overturning moment and the lower foundation has insufficient anti-deformation capacity under the action of wind load and ground wire load.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a compound spiral anchor basis of steel-pipe pole antidumping ability of transmitting electricity, 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 connecting steel beam between the satellite spiral anchor, the connecting steel beam with satellite spiral anchor support is articulated 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 the horizontal force of the power transmission steel pipe pole are transmitted to the main spiral anchor by the connecting flange and are jointly born by the main spiral anchor and the satellite spiral anchor. The overturning moment is borne by the main spiral anchor and the satellite spiral anchor together, wherein the overturning moment borne by the satellite spiral anchor is converted into the upward pulling and downward pressure of the satellite spiral anchor, and the satellite spiral anchor performs upward pulling and downward pressure bearing capacity checking calculation; the horizontal force is shared by the main screw anchor and the satellite screw anchor, wherein the satellite screw anchor provides the horizontal force by the component of the upper pulling and lower pressing 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 spiral anchor and the satellite spiral anchor respectively comprise an anchor head, an anchor rod and an anchor blade, wherein the diameter of the anchor rod of the main spiral anchor is 500mm-1000mm, and the diameter of the anchor blade is 1000mm-1500 mm; the diameter of an anchor rod of the satellite spiral anchor is 200mm to 500mm, and the diameter of an anchor blade is 400mm to 1000mm.
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 pterygoid lamina of main screw anchor punches and the cross sectional dimension slightly is less than the cross sectional dimension of connecting the girder steel, and one side of connecting the girder steel punches, aperture and hole site and the aperture and the hole site phase-match on pterygoid lamina.
Further, the connection steel beam is connected with the satellite spiral anchor through an articulated joint.
Further, 4-6 satellite spiral anchors are arranged around the main spiral anchor, and the satellite spiral anchors are uniformly arranged along the periphery of the main spiral anchor.
Furthermore, the satellite spiral anchor is obliquely arranged at a certain angle with the vertical direction, the angle of inclination is 15-30 degrees, and the satellite spiral anchor is used for sharing a part of horizontal force.
Further, be provided with the cross roof beam in the stock top twice stock diameter range of main spiral anchor and consolidate, cross roof beam cross-sectional dimension sets up to 50mm, prevents that stock top atress from concentrating and taking place the warpage and destroy.
In summary, the satellite screw anchors are radially arranged with the main screw anchor as the center, 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 the horizontal force of the power transmission steel pipe pole are transmitted to the main spiral anchor by the connecting flange and are jointly born by the main spiral anchor and the satellite spiral anchor. Because the space between the satellite screw anchors is enlarged and the satellite screw anchors are obliquely arranged, the anti-overturning bearing capacity and the anti-horizontal bearing capacity of the main screw anchor and the corresponding foundation rigidity provided by the pulling-up, pressing-down and horizontal bearing capacity of the main screw anchor are greatly improved, so that the problems of insufficient anti-overturning bearing capacity and overlarge lateral deformation of the steel pipe rod in the single screw anchor foundation design are effectively solved.
Drawings
FIG. 1 is a three-dimensional view of a main screw anchor of the present invention with wings;
FIG. 2 is a top plan view of the wing plate-equipped primary screw anchor of the present invention;
FIG. 3 is a three-dimensional view of a satellite screw anchor of the present invention;
FIG. 4 is a three-dimensional view of a connecting steel beam according to the present invention;
FIG. 5 is a three-dimensional view of the composite spiral anchor foundation of the present invention.
Description of the labeling: 1. a connecting flange; 2. a primary screw anchor; 3. satellite screw anchors; 4. connecting the steel beams; 5. a wing plate; 6. an articulated joint; 7. a bolt; 8. a cross beam.
Detailed Description
The embodiment of the composite spiral anchor foundation for improving the anti-overturning capability of the power transmission steel pipe pole of the invention is further described with reference to fig. 1 to 5.
Referring to fig. 5, a three-dimensional view of the composite screw anchor foundation is shown, and it can be seen that the composite screw anchor foundation of the present embodiment includes a connection flange 1, a main screw anchor 2, a satellite screw anchor 3, and a connection steel beam 4. Satellite screw anchor 3 uses main screw anchor 1 to be radial evenly spaced distribution as the center, connects 2 one end of girder steel and is connected through bolt 7 with pterygoid lamina 5 of main screw anchor 1, and the other end is articulated through articulated joint 6 with satellite screw anchor 3, and satellite screw anchor 3 is certain angle slope setting with the vertical direction, and stock top 1 of main screw anchor 1 is provided with cross beam 8 and consolidates (as shown in fig. 2).
The parameters of a certain southeast coastal soft soil stratum are shown in the following table, the annual average underground water level is-0.5 m, and the highest underground water level can reach 0m. The tower type of a certain power transmission line tower is SGJ1, the nominal height is 21m, the outer diameter of the tower is 1.61m, and the outer diameter of a flange plate at the lower part is 2.12m. The foundation withstood a compressive load of 267kN, a horizontal load of 211kN, and a bending moment of 5207kN · m. Because the bending moment that the foundation bears, namely the overturning moment is too large, the single foundation form is difficult to meet the requirement of bearing capacity, so the composite spiral anchor foundation is arranged.
And (3) designing a composite spiral anchor foundation consisting of 1 main spiral anchor 2 and 4 satellite spiral anchors 3 (shown in figures 1 and 3) arranged below each tower. The inclination angle of the satellite screw anchor 3 is 30 degrees, the connecting steel beams 4 are arranged into box beams (as shown in figure 4), the number of the connecting steel beams is 4, the length, the width and the height of each box beam are 1.5m, 0.15m and 0.2m respectively, the wall thickness is 10mm, and the screw anchor and the box beams are made of Q355 steel. The connecting flange 1 is matched with a flange plate at the lower part of a tower, the outer diameter of the connecting flange 1 is 2.12m, the diameter of each bolt hole is 64mm, and the number of the bolt holes is 24.
TABLE 1 physical and mechanical parameters of the formation
Note: in the tablemIs the proportionality coefficient of the horizontal resistance coefficient of the foundation soil.
The main spiral anchor 2 is provided with three anchor plates with the burial depths of-4 m, -8m and-10 m respectively, the diameter of the anchor rod is 500mm, the diameter of the anchor plate is 1000mm, the length, the width and the height of the steel cross beam 8 are 50mm, 50mm and 1000mm respectively, the wall thickness of the anchor rod and the thickness of the anchor plates are 12mm, and the thread pitch of the anchor plates is 100mm. And calculating according to a bearing capacity calculation formula provided by overhead transmission line spiral anchor foundation design specification Q/GDW 10584-2022 and overhead transmission line foundation design technical regulation DL/T5219-2014 to obtain a main spiral anchor 2 lower pressure bearing capacity value of 1005.5kN, a horizontal bearing capacity value of 114.96kN and an anti-overturning bearing capacity value of 4301kN · m. The calculation result shows that the pressing bearing capacity meets the requirement, the horizontal and anti-overturning bearing capacities do not meet the requirement, and therefore the part of the load needs to be borne by the satellite screw anchor 3.
The satellite screw anchor 3 is provided with 3 anchor plates, the burial depth is respectively-1.25 m, -2m and-2.75 m after the satellite screw anchor is inclined for 30 degrees along the vertical direction, the diameter of the anchor rod is 300mm, the diameter of the anchor plate is 600mm, the length of the anchor rod is 6m, the anchor plates are respectively arranged at the positions of-2.5 m, -4.0m and-5.5 m of the top of the anchor rod, the wall thickness of the anchor rod and the thickness of the anchor plates are both 12mm, and the thread pitch of the anchor plates is 100mm. Each satellite screw anchor 3 may provide an uplift bearing capacity 461.9kN and a down-press bearing capacity 629.2kN in the oblique direction according to the calculation formulas in the specifications. The vertical and horizontal component forces of the pull-up bearing force are 230.9kN and 230.9kN respectively, and the vertical and horizontal component forces of the pull-down bearing force are 544.9kN and 314.6kN respectively. Therefore, the horizontal bearing force provided by the pair of satellite screw anchors 3 is 545.5kN which is the sum of the horizontal direction component of the pull-up bearing force and the horizontal direction component of the push-down bearing force, and the anti-overturning force provided by the pair of satellite screw anchors is 1417kN m which is the sum of the vertical direction product of the pull-up bearing force and the push-down bearing force and the length of the box girder.
When the box girder is subjected to the overturning force, the box girder on one side can also provide partial overturning resistance, and the partial overturning resistance can be calculated according to a formula related to building foundation design specification GB50007-2011, wherein the resistance is taken as safety preparation.
Under the worst load angle, namely, the directions of the horizontal force and the bending moment are the same as the directions of a certain pair of satellite spiral anchors 3, the two component forces cannot be decomposed into two components and are respectively born by the two pairs of satellite spiral anchors 3. At the moment, 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 bearing capacity and the overturning bearing capacity are respectively greater than the horizontal load 211kN and the overturning moment 5207 kN.m which need to be borne by the foundation, so that the stress requirement is met.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (8)
1. The utility model provides a compound spiral anchor basis of steel-pipe pole antidumping ability that transmits electricity, its characterized in that: the satellite screw anchor comprises a main screw anchor body, wherein a plurality of satellite screw anchors are arranged at the upper end of the main screw anchor body at intervals along the circumferential direction, a connecting steel beam is arranged between the main screw anchor body and the satellite screw anchors, the connecting steel beam and a satellite screw anchor support are hinged to each other, and a connecting flange connected with an upper steel pipe rod is arranged at the top of the main screw anchor body.
2. The composite spiral anchor foundation for improving the anti-overturning capacity of the steel pipe pole in the power transmission manner according to claim 1, which is characterized in that: the main spiral anchor and the satellite spiral anchor respectively comprise an anchor head, an anchor rod and an anchor blade, wherein the diameter of the anchor rod of the main spiral anchor ranges from 500mm to 1000mm, and the diameter of the anchor blade ranges from 1000mm to 1500mm; the diameter of an anchor rod of the satellite spiral anchor is 200mm to 500mm, and the diameter of an anchor blade is 400mm to 1000mm.
3. The composite spiral anchor foundation for improving the overturning resistance of the steel pipe pole in power transmission according to claim 1, which is characterized in that: and 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.
4. The composite spiral anchor foundation for improving the overturning resistance of the steel pipe pole in power transmission according to claim 3, wherein the composite spiral anchor foundation comprises: the pterygoid lamina of main screw anchor punches and cross sectional dimension slightly is less than the cross sectional dimension of connecting the girder steel, and one side of connecting the girder steel punches, aperture and hole site phase-match on aperture and the pterygoid lamina.
5. The composite spiral anchor foundation for improving the anti-overturning capacity of the steel pipe pole in the power transmission manner according to claim 1, which is characterized in that: the connecting steel beam is connected with the satellite spiral anchor through a hinged joint.
6. The composite spiral anchor foundation for improving the anti-overturning capacity of the steel pipe pole in the power transmission manner according to claim 1, which is characterized in that: 4-6 satellite spiral anchors are arranged around the main spiral anchor, and the satellite spiral anchors are uniformly arranged along the periphery of the main spiral anchor.
7. The composite spiral anchor foundation for improving the overturning resistance of the steel pipe pole in the power transmission manner according to claim 6, which is characterized in that: the satellite screw anchor is obliquely arranged at a certain angle with the vertical direction, and the inclination angle is 15-30 degrees.
8. The composite spiral anchor foundation for improving the anti-overturning capacity of the steel pipe pole in the power transmission manner according to claim 1, which is characterized in that: the cross beam is arranged in the range of the diameter of the anchor rod which is two times of the top of the anchor rod of the main spiral anchor for reinforcement, and the cross beam is 50mm multiplied by 50mm in cross section size.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211507625.8A CN115787703A (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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| Application Number | Priority Date | Filing Date | Title |
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| CN202211507625.8A CN115787703A (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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| CN115787703A true CN115787703A (en) | 2023-03-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116537248A (en) * | 2023-06-06 | 2023-08-04 | 辽宁韶华电力技术有限公司 | Transmission line straight-inclined combined tree root-shaped spiral anchor foundation |
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2022
- 2022-11-29 CN CN202211507625.8A patent/CN115787703A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116537248A (en) * | 2023-06-06 | 2023-08-04 | 辽宁韶华电力技术有限公司 | Transmission line straight-inclined combined tree root-shaped spiral anchor foundation |
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