CN-122013809-A - Construction method of overwater photovoltaic panel under hard geological condition

CN122013809ACN 122013809 ACN122013809 ACN 122013809ACN-122013809-A

Abstract

The invention provides a construction method of a photovoltaic panel on water under a hard geological condition, which belongs to the technical field of photovoltaic panel construction, and the invention dynamically adjusts parameters of a dewatering well system and an air curtain by constructing a steel sheet pile cofferdam and combining an air curtain water-resisting layer and high-pressure grouting to form a dry construction environment, calculating a cofferdam bearing stability evaluation value and a pit bottom dryness evaluation value based on water seepage and water level data, the hydraulic down-the-hole hammer drill with the high-frequency ultrasonic generating device is adopted to reduce the compressive strength of the rock stratum by utilizing the ultrasonic cavitation effect to complete pile foundation pore-forming, a double-layer optimization model is adopted to solve game balance points to obtain optimal construction parameter combinations and adjust equipment operation parameters, a cofferdam is dismantled after pile top treatment and photovoltaic assembly installation to realize cross-unit cable laying through an overwater floating bridge, and the technical problems of low construction efficiency of the overwater photovoltaic pile foundation and high seepage control difficulty of the cofferdam under hard geological conditions are solved.

Inventors

LI QUNLONG
JIANG TAO
ZHUANG BOYU
LIU GUOZHENG
SUN YANZHEN
WANG ZHENXING

Assignees

中建八局发展建设有限公司

Dates

Publication Date: 20260512
Application Date: 20260209

Claims (10)

1. A construction method of a photovoltaic panel on water under a hard geological condition is characterized in that a three-dimensional geological model comprising bedrock distribution thickness and strength parameters is established by high-resolution multi-beam sounding and underwater drilling coring on a preset water area of the photovoltaic project on water to identify a hard stratum construction area and plan an anhydrous operation unit block, a steel sheet pile cofferdam is constructed on the anhydrous operation unit block in sequence, an annular perforated pipeline is arranged underwater on the periphery to form an air curtain water-resisting layer, a low-pressure buffer area is established by generating a pressure gradient through rising air bubbles to weaken the hydrostatic pressure of an external water body, meanwhile, a flexible rubber water stop is paved on the bottom of the steel sheet pile cofferdam and combined with a high-pressure grouting plugging rock stratum crack matched with a dewatering well system drainage body to form a dry construction environment, water seepage monitoring data and external water level data are collected to calculate a cofferdam bearing stability evaluation value and a pit bottom dryness evaluation value, the arrangement density and the air curtain water-resisting layer air injection pressure parameter of the dewatering well system are dynamically adjusted, a hydraulic down-hammer equipped with a diamond drill bit is used under the dry environment, an ultrasonic cavitation effect is utilized to generate a reduced macroscopic micro-crack on the rock surface to reduce the pressure resistance, the micro-crack is formed on the rock surface, the top surface is optimized to form a hole-forming through the ultrasonic wave cavitation effect, the top-forming device is optimized, and the top-layer is optimized through the water-level bridge is installed to be combined with a photovoltaic bridge construction unit to obtain a best-level-oriented optimal performance parameter, and the optimal construction parameter is achieved through a top-bridge-oriented unit.
2. The method of claim 1, wherein the hard formation comprises a matrix layer, a high-solidity gravel layer, or a consolidated and deeply hard clay layer, and the matrix layer is granite, basalt, or limestone layer with a compressive strength exceeding 60 MPa.
3. The method for constructing a photovoltaic panel on water under hard geological conditions according to claim 2, wherein the high-resolution multi-beam sounding refers to an underwater detection technology for identifying a rock stratum interface by utilizing sound wave reflection characteristics, and the underwater drilling coring refers to a investigation method for extracting a core sample from underwater bedrock by using a drilling device and performing a physical test to obtain mechanical parameters.
4. A method of construction of photovoltaic panels on water under hard geological conditions according to claim 3, wherein the air curtain water barrier is formed by continuously injecting compressed air through annular perforated pipes, the low pressure buffer zone is a zone where the hydrostatic pressure of the external water body is weakened by 20% to 40%, and the air curtain water barrier simultaneously blocks the penetration of suspended particles into the steel sheet pile cofferdam to prevent piping damage.
5. The construction method of the photovoltaic panel on water under the hard geological condition according to claim 4, wherein the flexible rubber water stop is a neoprene strip-shaped sealing piece with the thickness of 8-12 mm, the neoprene strip-shaped sealing piece is paved on the contact surface between the bottom of the steel sheet pile cofferdam and the bedrock layer, and the high-pressure grouting means that cement slurry with the pressure of 2-5 MPa is injected into a stratum crack to be solidified to form an impermeable layer.
6. The method for constructing the photovoltaic panel on water under the hard geological condition according to claim 5, wherein the cofferdam bearing stability evaluation value is calculated as the product of the difference between the internal water level and the external water level of the steel sheet pile cofferdam divided by the standard value of the cofferdam design bearing water level difference and the monitoring value of the horizontal displacement of the side wall of the steel sheet pile cofferdam divided by the standard value of the displacement safety limit.
7. The method according to claim 6, wherein the pit bottom dryness evaluation value is calculated as a product of a standard water content value divided by a measured water content value of a pit bottom soil body and a standard water seepage rate value divided by a measured water seepage rate value, and the measured water seepage rate value is a water seepage amount monitoring data divided by a monitoring time period.
8. The method of claim 7, wherein the stability threshold is set to 0.85 and the dryness threshold is set to 0.90, and the parameters of the dewatering well system and the air curtain water barrier are dynamically adjusted when the cofferdam load stability evaluation value is lower than the stability threshold or the pit bottom dryness evaluation value is lower than the dryness threshold.
9. The method for constructing a photovoltaic panel on water under hard geological conditions according to claim 8, wherein the ultrasonic cavitation effect means that high-frequency vibration generates alternate positive and negative pressure in rock pore liquid to cause generation and collapse of micro-bubbles, and shock waves and high temperature generated at the moment of collapse of the micro-bubbles act on a cementing surface between rock particles to form a microcrack network.
10. The construction method of the photovoltaic panel on water under the hard geological condition, which is characterized in that the gas lift reverse circulation hole cleaning process is to inject compressed gas into a drill rod to form a gas-liquid mixed flow, and buoyancy generated by the difference of gas and liquid is utilized to carry hole bottom rock debris to the ground surface for discharge.

Description

Construction method of overwater photovoltaic panel under hard geological condition Technical Field The invention belongs to the technical field of photovoltaic panel construction, and particularly relates to a construction method of a photovoltaic panel on water under a hard geological condition. Background The water photovoltaic power generation system generally needs to construct a pile foundation supporting structure in a water area, and the traditional construction method adopts a water platform to be matched with a percussion drill or a rotary drilling drill to form a pile foundation hole, so that the construction efficiency of a soft soil stratum or a medium-hardness stratum can still meet the engineering requirements. However, when encountering hard bedrock formations such as granite and basalt with compressive strength exceeding 60MPa, the conventional drilling equipment needs to replace the drill bit frequently and has slow footage speed, and the single pile hole forming time is often 3 to 5 times that of the conventional formations. Meanwhile, an effective water stop interface is difficult to form in a hard rock stratum of the steel sheet pile cofferdam constructed for creating a dry construction environment, continuous water seepage is caused in the cofferdam due to the development of bedrock cracks, the construction condition can be maintained only by continuous pumping and draining with high power in the existing precipitation system, the energy consumption cost is obviously increased, and the scientific basis for adjusting construction parameters is lacking. That is, the prior art has the technical problems that the construction efficiency of the photovoltaic pile foundation on water is low under the hard geological condition and the seepage control difficulty of the cofferdam is high. Disclosure of Invention In view of the above, the invention provides a construction method of a photovoltaic panel on water under a hard geological condition, which can solve the technical problems of low construction efficiency of a photovoltaic pile foundation on water under the hard geological condition and high seepage control difficulty of a cofferdam in the prior art. The construction method of the photovoltaic panel on water under the hard geological condition is characterized in that a three-dimensional geological model comprising bedrock distribution thickness and strength parameters is established by high-resolution multi-beam sounding and underwater drilling coring to identify a hard stratum construction area and plan an anhydrous operation unit block, a steel sheet pile cofferdam is sequentially constructed on the anhydrous operation unit block, annular perforated pipes are arranged underwater on the periphery to form an air curtain water-resisting layer, a low-pressure buffer area is established by rising air bubbles to weaken external water hydrostatic pressure through pressure gradient, meanwhile, a flexible rubber water stop is paved at the bottom of the steel sheet pile cofferdam, a high-pressure grouting rock stratum fracture is combined with a drainage body of a dewatering well system to form a dry construction environment, water seepage monitoring data and external water level data are collected to calculate a cofferdam bearing stability evaluation value and a pit bottom dryness evaluation value, the arrangement density and air curtain air injection pressure parameters of the dewatering well system are dynamically adjusted, a hydraulic down-hole hammer drill equipped with a diamond bit is used in the dry environment, pile foundation is produced on the surface by utilizing ultrasonic cavitation effect, the micro-crack is reduced in the surface to produce pile foundation strength through pressure gradient, the minimum drainage cofferdam is constructed, the optimal performance is achieved through the optimal performance of the water-level water-jet device, and the optimal construction device is combined with the optimal performance parameter of the photovoltaic platform assembly through the top-level optimization, and the optimal construction device is combined with the optimal performance parameter is achieved. Wherein the hard stratum comprises a base stratum, a high-compactness gravel layer or a concreted and deep hard clay layer, and the base stratum refers to a granite, basalt or limestone stratum with compressive strength exceeding 60 MPa. The high-resolution multi-beam sounding refers to an underwater detection technology for identifying a rock stratum interface by utilizing sound wave reflection characteristics, and the underwater drilling coring refers to a exploration method for extracting a rock core sample from underwater bedrock through drilling equipment and performing a physical test to obtain mechanical parameters. The air curtain water-resisting layer is used for continuously injecting compressed air through the annular perforated pipeline to form a dense bubble curtain wall, t