Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Partially prefabricated modular foundation system

a modular foundation and prefabricated technology, applied in the field of partially prefabricated foundations, can solve the problems of compromising the structural integrity of the foundation, the risk of thermal cracking becomes very high, etc., and achieves the effects of reducing engineering work, reducing engineering work, and simplifying the permitting process

Inactive Publication Date: 2008-03-27
AHMED PHULY ENG & CONSULTING
View PDF31 Cites 74 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]A wind turbine foundation having a plurality of components, namely a central vertical pedestal, a substantially horizontal bottom support slab, and a plurality of radial reinforcing ribs extending radially outwardly from the pedestal. The ribs are prefabricated and transported to job site, but the pedestal and support slab are poured in situ at the site out of concrete. The prefabricated ribs are equipped with load transfer mechanisms, for shear force and bending moment, along the conjunctions with the cast in situ support slab. The prefabricated ribs are also equipped at their inner ends with load transfer mechanisms, for shear force and bending moment, along the conjunctions with the cast in situ pedestal. The ribs are arranged in a circumferentially spaced manner around the outer diameter of the pedestal cage assembly and slab reinforcing steel is installed. Forms are then arranged for the pedestal and support slab. The support slab is cast in situ by pouring concrete into the forms and then pedestal concrete is poured over the slab into the pedestal form. When the concrete cures the support slab is united to the prefabricated ribs and the ribs are also united to the pedestal. The final result is continuous monolithic polygon or circular shape foundation wherein loads are carried across the structure vertically and laterally through the continuous structure by the doweled and spliced reinforcing steel bars which are integrally cast into the pedestal, ribs and support slab. The combination of the high stiffness of the ribs, solid pedestal and continuous slab construction across the pedestal, and through or under ribs, allows the slab to behave structurally as a continuous slab over multiple rigid supports resulting in small bending and shear stresses in the slab, reducing deflections and increasing the stiffness of the foundation, improving fatigue conditions as well as allowing for the benefits of an economical design. Support slab reinforcing steel covers the entire footprint of the foundation and extends across the slab area under the pedestal to improve the structural performance of the foundation under different loading conditions.
[0045]A further object of this invention is to improve the quality and productivity of foundation construction due to experience gained from practicing standard construction techniques.

Problems solved by technology

When concrete is cast in massive sections for wind tower foundations, temperature can reach 160 degree F. and the risk of thermal cracking becomes very high unless cooling techniques are applied.
Thermal cracking often compromises the structural integrity of the foundations.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Partially prefabricated modular foundation system
  • Partially prefabricated modular foundation system
  • Partially prefabricated modular foundation system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0063]The present invention pertains to a wind turbine foundation for wind turbines. The foundation comprises a plurality of components, namely a central vertical pedestal, a substantially horizontal bottom support slab, and a plurality of radial reinforcing ribs extending radially outwardly from the pedestal. The ribs are prefabricated and transported to job site, but the pedestal and support slab are poured in situ at the site out of concrete.

[0064]A construction site is prepared by excavation and flattening and preparation of soil for the foundation 10. The foundation 10 may be set on pilings, on piers, or have anchors in a conventional manner.

[0065]The foundation 10 may be set on a mud slab 14 or on compacted granular fill. The mud slab is often a thin plain concrete layer intended to provide a clean and level base for foundation installation. After the foundation site has been prepared, a plurality of three or more precast stiffener ribs 16 are placed on the mud slab 14 or comp...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
widthaaaaaaaaaa
lengthaaaaaaaaaa
Login to View More

Abstract

A wind turbine foundation having a central pedestal, a bottom support slab, and a plurality of prefabricated radial reinforcing ribs. The pedestal and support slab are poured in situ at the site. When the concrete cures the support slab is united to the prefabricated ribs and the ribs are also united to the pedestal. The result is a continuous monolithic foundation wherein loads are carried across the structure vertically and laterally through the continuous structure by doweled and spliced reinforcing steel bars which are integrally cast into the pedestal, ribs and support slab. The slab thus behaves structurally as a continuous slab reducing deflections, improving fatigue conditions and increasing the stiffness of the foundation as well as allowing for the benefits of an economical design.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to a method for building partially prefabricated foundations for supporting wind turbines towers.[0003]2. Description of the Related Art[0004]Conventional gravity style foundations for large wind turbine usually comprise a large, thick, horizontal, heavily reinforced cast in situ concrete base; and a vertical cast in situ cylindrical pedestal that is installed over the base. There are several problems that are typically encountered during the construction of such foundations.[0005]The main problem is the monumental task of managing large continuous concrete pours, which require sophisticated planning and coordination in order to pour more than four hundred yards of concrete in one continuous pour, without having any cold joints in.[0006]Another problem is logistics coordinating with multiple local batch plants the delivery plan of the large number of concrete trucks to the job site in a timely, or...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): E04H12/12E02D27/32E04G21/02
CPCE02D27/42F03D11/045Y02E10/728F05B2240/912Y02B10/30F05B2230/50F03D13/22E02D27/425E02D27/02E02D27/08E02D27/26E02B17/025E02B17/027E02B2017/006E02B2017/0069E02B2017/0073E02B2017/0091E04H12/08E04H12/16Y02P70/50Y02E10/72E04C5/04E04C5/0604E04C5/162E04C5/168E04G21/12E04H2012/006E04G21/02E04H12/341E02D27/28F03D13/20F03D13/201B28B1/14
Inventor PHULY, AHMED
Owner AHMED PHULY ENG & CONSULTING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products