CN-121992810-A - Construction method of photovoltaic miniature pile foundation for steep hillside mountain under complex geological conditions

CN121992810ACN 121992810 ACN121992810 ACN 121992810ACN-121992810-A

Abstract

The invention discloses a construction method of a photovoltaic miniature pile foundation in a steep slope mountain region under complex geological conditions, and relates to the technical field of photovoltaic foundation construction. Aiming at the problems of large gradient of steep hillsides, complex terrain, difficult operation of large machinery and sensitive ecological environment, the method adopts the structural form of 'small-diameter pile group and corner-cut triangular bearing platform', and combines the heavy-load unmanned aerial vehicle lifting technology to realize minimally invasive, efficient and green construction. The method comprises the steps of construction preparation, measurement and positioning, hole forming, reinforcement cage and bearing platform reinforcement installation, material transportation based on a heavy-duty unmanned aerial vehicle, concrete pouring, maintenance and the like. The method has strong environmental adaptability, can overcome 15-45-degree steep slopes and complex geological conditions, greatly reduces earth excavation and vegetation damage, has high structural bearing capacity and low manufacturing cost, solves the problems of low efficiency, serious ecological damage and the like of the traditional construction method, is suitable for mountain photovoltaic power station projects, and is particularly suitable for photovoltaic foundation construction of ecologically sensitive areas.

Inventors

DU QIN
ZHANG JIHUA
ZHENG YUNGANG
WANG WEI
LI SHIHAI
LEI GANG
Zhan junyang
YANG DINGLI
ZHAO WENNAN

Assignees

中国电建集团昆明勘测设计研究院有限公司
怒江州扶贫投资开发有限公司

Dates

Publication Date: 20260508
Application Date: 20260123

Claims (8)

1. The construction method of the photovoltaic micro pile foundation of the steep slope mountain land under the complex geological condition is characterized by comprising the following steps of: (1) Cleaning a construction channel, arranging safety ropes and anti-skid measures on a steep slope section, and selecting small drilling equipment according to a geological survey report; (2) Measuring and positioning, namely precisely positioning by using an RTK or a total station, determining a center point of a triangular cutting angle bearing platform and specific hole sites of three piles, and marking by using lime or wood piles; (3) Hole forming construction, namely positioning a drilling machine and erecting a temporary working platform, adopting a drill bit with the diameter of 150mm to drill, controlling the drilling depth to 1400mm, adopting impact drilling when encountering hard rock, adopting rotary drilling when encountering soil layer, and adopting high-pressure air or clear water to clear holes after hole forming; (4) The pile body reinforcement cage is placed in a hole and kept centered, the pile body reinforcement extends into the pile cap and is reliably connected with the pile cap reinforcement, the pile cap reinforcement cage adopts a chamfer triangle form, the longitudinal stress reinforcement is provided with a top row and a bottom row, each side is provided with three structural longitudinal reinforcements, and the stirrups adopt triangle stirrups; (5) The material transportation based on the heavy-duty unmanned aerial vehicle comprises the steps of arranging an unmanned aerial vehicle material flow collecting and distributing center beside a mountain foot or a gentle slope road, dividing a functional area, arranging an electronic fence, implementing redundant load according to the maximum effective load of the unmanned aerial vehicle, lifting materials such as a reinforcement cage, concrete, reinforcement and the like by adopting an AB point full-automatic flight mode, and realizing uninterrupted circulating transportation by configuring 4-6 groups of intelligent batteries and 2 high-power super-charge generators for a single unmanned aerial vehicle; (6) Concrete pouring, namely pouring concrete of a bearing platform and calendaring a receiving surface by adopting C25 or C30 fine stone concrete to pour a pile body and vibrating for compaction, installing a chamfer triangle template and a photovoltaic bracket embedded bolt; (7) And curing, namely covering a film within 12 hours after the concrete pouring is finished, and spraying water for curing, wherein the curing time is not less than 7 days.
2. The construction method of the photovoltaic micro pile foundation for the steep hillside under the complex geological condition, as set forth in claim 1, wherein the small drilling equipment in the step (1) is a small pneumatic hand-held impact drill or a QZ-150 portable down-the-hole drill.
3. The construction method of the photovoltaic micro pile foundation for the steep hills under the complex geological conditions, as set forth in claim 1, is characterized in that the pile diameter deviation in the step (3) is not less than 150mm, the pile length deviation is not less than 1400mm, and the perpendicularity deviation is less than 1%.
4. The construction method of the photovoltaic micro pile foundation for the steep hills under the complex geological condition, which is characterized in that the height of the triangular bearing platform with the chamfer angle in the step (4) is 500mm, and the depth of the bearing platform embedded into the soil body is set according to the design requirement.
5. The construction method of the photovoltaic micro pile foundation of the steep hillside under the complex geological condition, as set forth in claim 1, is characterized in that in the step (5), the unmanned aerial vehicle is a four-axis eight-paddle heavy-load industrial unmanned aerial vehicle with a lifting weight of 70KG, and the single lifting weight is 80% -90% of the rated load, namely 25KG-40KG.
6. The construction method of the photovoltaic micro pile foundation for the steep hills under the complex geological conditions, as set forth in claim 1, is characterized in that in the step (5), high-strength plastic or aluminum alloy hoppers with dead weights of less than 3kg are adopted for concrete/sand transportation, a plug pin type or remote control type discharge opening is arranged at the bottom, long rods are bundled and lifted by double points, and short components are filled into special high-strength nylon hanging bags.
7. The construction method of the photovoltaic micro pile foundation for the steep hills under the complex geological conditions, as set forth in claim 1, is characterized in that in the step (5), the unmanned aerial vehicle hovers at a height of 5-10 meters above the pile position, after being confirmed by ground receiving personnel, the unmanned aerial vehicle descends to a position 1-2 meters away from the ground, ordinary materials are manually assisted to unhook, and a concrete hopper is opened by the ground personnel to directly access the mould through a bottom valve.
8. The construction method of the photovoltaic micro pile foundation for the steep hillside under the complex geological condition, which is characterized in that the center deviation of the embedded bolt in the step (6) is controlled within +/-2 mm, and the elevation deviation is controlled within +/-5 mm.

Description

Construction method of photovoltaic miniature pile foundation for steep hillside mountain under complex geological conditions Technical Field The invention relates to the technical field of photovoltaic foundation construction, in particular to a construction method of a photovoltaic miniature pile foundation in a steep hillside mountain under complex geological conditions. Background The demand of the construction land of the photovoltaic power generation project is increasingly short, and the construction of the photovoltaic power station gradually extends to complicated terrain areas such as mountain areas, hills and the like. Such areas generally have the characteristics of large gradient, severe relief, complex geological conditions (such as more stones and shallow rock strata) and the like, and bring a plurality of difficulties to the construction of the photovoltaic foundation. The traditional photovoltaic support foundation mainly comprises an independent expansion foundation, a long spiral filling pile and the like, but has obvious defects in steep hillside construction, namely, large machinery cannot be used for climbing operation, construction flexibility is poor, earth excavation quantity is large, construction efficiency is low, earth vegetation and original landforms are seriously damaged, water and soil loss are caused, green construction requirements are not met, a structural stress system is unreasonable, pulling resistance, compression resistance and anti-overturning capability are required to be improved aiming at the characteristic that the photovoltaic support bears large wind load, material transportation is difficult, traditional manual piggyback efficiency is low, cableway erection can damage vegetation, and manufacturing cost is high. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide a construction method of a photovoltaic miniature pile foundation of a steep hillside under complex geological conditions, which adopts a structure form of 'small-diameter pile group and corner-cut triangle bearing platform', and combines a heavy-load unmanned aerial vehicle lifting technology to effectively solve a plurality of problems faced by the construction of the photovoltaic foundation of the steep hillside. The invention discloses a construction method of a photovoltaic micro pile foundation of a steep slope mountain land under a complex geological condition, which is characterized by comprising the following steps of: (1) And (3) preparation of construction: According to geological survey report, small pneumatic hand-held impact drill or QZ-150 portable down-the-hole drill and other small drilling equipment are selected to adapt to mountain land operation environment; (2) Measuring and positioning: the RTK or the total station is used for accurately positioning, a center point of the triangular angle-cutting bearing platform and specific hole sites of three piles are determined, and marks are made by lime or wood piles, so that the relative positions of the three piles are accurate, and precision guarantee is provided for the installation of reinforcing steel bars and templates of the subsequent bearing platform; (3) Hole forming construction: Setting up a temporary operation platform for a steep slope section after a drilling machine is in place to ensure the perpendicularity of a drill rod, adopting a drill bit with the diameter of 150mm to drill, controlling the drilling depth to be 1400mm, adopting impact drilling when encountering hard rock and rotary drilling when encountering soil layer, adopting high-pressure air or clean water to clean sediment in the hole after the hole forming reaches the designed depth, and controlling the pile diameter to be more than or equal to 150mm, the pile length to be more than or equal to 1400mm and the perpendicularity deviation to be less than 1% in the hole forming process; (4) Reinforcing steel bar cage and bearing platform reinforcing steel bar installation: Pre-manufacturing a pile body reinforcement cage, putting the pile body reinforcement cage into a hole and keeping the pile body reinforcement cage centered; pile body steel bars need to extend into the bearing platform and are reliably connected with the bearing platform steel bars to form a whole, the bearing platform steel bar cage adopts a chamfer triangle form, longitudinal stress bars are arranged in a top row and a bottom row, three longitudinal structural bars are arranged on each side, stirrups are optimized into triangular stirrups so as to adapt to the layout of miniature three piles and reduce steel waste, the height of the chamfer triangle bearing platform is 500mm, and the depth of the bearing platform embedded into soil body is set according to design requirements; (5) Material transportation based on heavy-duty unmanned aerial vehicle: Setting an unmanned aerial vehicle logistics collecting and distributing center beside a mountain foot