This 20MW Demonstration Project is the first power plant in Hainan, and it is a joint venture of Hainan Tianneng Electricity Co., Ltd., Hainan Provincial Water Conservancy & Hydropower Group Co., Ltd. and Yingli Solar. Various types of solar mounting systems, such as ground screw, concrete post, roof power plant and BIPV, will be employed.

Case Study: PowerScrew System

Contributed by | Powerway Renewable Energy Co., Ltd

Powerway Manufactures PV Ground Screws for A 20MW Power Plant in Lingao County, Hainan Province, China

Customer: Hainan Tianneng Electricity Co., Ltd.

Location: Lingao County, Hainan Province, China

Project Overview:

This 20MW Demonstration Project is the first power plant in Hainan, and it is a joint venture of Hainan Tianneng Electricity Co., Ltd., Hainan Provincial Water Conservancy & Hydropower Group Co., Ltd. and Yingli Solar. Various types of solar mounting systems, such as ground screw, concrete post, roof power plant and BIPV, will be employed.

 

Soil Condition:

This project is located in the coastal terrace and features a variety of geomorphic surface configurations in mostly scrub land. The terrain is open, flat and slightly undulating. The site's southern section is slightly higher than the northern, and tilted to the northeast, with basalt outcrops in some areas. The ground elevation varies from 10.37m to 19.25m with a relative height of 8.88m. The surface is comprised of dry land, forest belt, short shrub, sparse grass, etc.

 

Mechanical Parameters of Foundation Soil:

According to the comprehensive analysis elevation of the test results, on-site evaluation, laboratory test results, and project experience, the bearing capacity values of the foundation soil are shown in the table below.

Table 4.3-1   Mechanical Parameters of Foundation Soil

Num.

Type

Weight

Cohesion

 

Internal friction angle

Modules of compression

 

Eigenvalue of bearing capacity

 

γ

CK

φK

ES1-2

fak

KN/m3

kPa

Degree

MPa

kPa

Silt

__

__

__

__

80

Silty clay with gravel

17.2

26.40

13.57

4.71

120~150

Clay with gravel

17.0

31.41

15.57

7.31

180~200

Intense weathering basalt

__

__

__

20

500

Medium weathering basalt

__

__

__

__

2500

Note: The data is from trial value and empirical value.

 

Load Tests of PowerScrew:

Static Load Test Result:

Test Number

1

2

3

4

5

6

PowerScrew Number

1#

2#

3#

4#

5#

East 1#

Test Load (kN)

50

50

50

50

50

50

Total Sedimentation (mm)

17.03

10.64

12.49

13.58

10.74

43.55

 

 

Pull-out Test Result:

Test Number

1

2

3

4

5

6

PowerScrew Number

1#

2#

3#

4#

5#

East 1#

Test Load (kN)

30

30

30

30

30

30

Total Extraction (mm)

17.95

19.39

14.14

10.73

11.60

38.91

 

 

Horizontal Load Test Result

Test Number

1

2

3

4

5

6

PowerScrew Number

9#

10#

8#

7#

6#

East 2#

Test Load (kN)

10

10

10

10

10

10

Total Displacement (mm)

20.73

21.70

9.84

8.23

9.60

24.77

 

Properties of PowerScrew:

  •  Built from Q235B Steel pipes.
  •  Typically 1200-2000mm in height and 50-130mm in diameter.
  •  Pipe thickness is selected based on loads and corrosion requirements.
  •  Pipe is pressed at one end to form a cone with a patented process.
  •  One continuous pipe with no welding.
  •  Creates thicker material at high load sections.
  •  Wing is welded with TIG or MIG welding technologies.
  •  PowerFlange is welded for Powerway racking connection.
  •  Entire earth screw is hot dipped galvanized according to ISO 1461:1999.
  •  Stainless steel earth screws for highly corrosive soils.

 

Advantages of PowerScrew System:

  • Instant and easy installation saves time and money.
  • Reusable design minimizes environmental impact.
  • Low cost for relocation.
  • Applicable to diverse projects and construction sites.
  • Available with installation machines and professional personnel.
  • Steel tube extruded without welding.
  • Static load analysis is done by PE, software simulation and testing is by a third party.

 

PowerScrew System:

The application of PowerScrew system helps decrease foundation cost, installation time, and environmental impact of ground solar mounting systems. PowerScrew is the fast and cost effective solution to ground mounting system in all known geologies, from loose soil to bedrock, sand, marsh, and slopes up to 30 degrees.

PowerScrews are manufactured with first quality materials - hot dip galvanized steel complying with the ISO 1461:1999. Powerway carries out strict quality controls in order to get the best quality performance as required by our internal procedures. All the PowerScrews have been statically tested for compression, and for both tensile and horizontal loads, according to stringent guidelines established for pressure resistance performance, stability and durability.

 

Introduction to Powerway:

As a professional designer and manufacturer of solar mounting system, Powerway has demonstrated to its customers with extensive aluminum fabrication experience, superior fully-automated production line, complete supply chain, and rigorous design and testing history. When outlining technical proposals for clients, besides offering a wide range of regular products, Powerway can help them achieve targets through numerous product and service improvements. Its experienced R&D team stays in close, direct contact with all customers to recommend customized solutions suited to their specific requirements, geographical conditions and climate.

Powerway’s highly-skilled management team and senior employees in Europe, the US, Canada and Japan, can provide prompt and convenient service for customers regardless of time zone, language or culture.

All the staff is also committed to “Safety, all the way” ensuring Powerway provides the safest, most reliable mounting systems.

Know more from: http://www.power-groundscrew.com/

Contact us through: china@pvpowerway.com


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