CA2849780A1

CA2849780A1 - Friction pile extension

Info

Publication number: CA2849780A1
Application number: CA2849780A
Authority: CA
Inventors: Christopher D. Seely
Original assignee: C Seely Enterprises Ltd
Current assignee: C Seely Enterprises Ltd
Priority date: 2014-04-28
Filing date: 2014-04-28
Publication date: 2015-10-28

Abstract

Whereas, a friction pile has an elongate columnar structure which extends at least 1 meter into the Earth; the concepts contained herein apply to same.
This is a novel method of and for the addition of at or near horizontal telescopic protrusions of various shape and size to and friction pile which are penetrated into the earth throughout the length of a pile installation and is applicable to the fabrication and installation of pipe type and or bored and cast in place concrete friction piles of any geometrical shape.
This concept and method is applicable to all current and future piling methods and materials.
The primary concept is the addition of telescopic protrusions of various shape and size to be penetrated into the earth throughout the length of the pile installation process from within the shaft or bored hole of a pile outwardly using various mechanical means to increase both load bearing capacities as well as uplift resistance as compared to current state of the art methods used in pile construction throughout the world.

Description

Description:
Current similar state of the art:
1. Straight pipe friction piles driven to pre-determined bad refusal friction values based on soil conditions with upward resistance based on skin friction produced between the pile casing and the strata in which it is installed.

2. Bored and cast in place concrete friction piles utilizing a straight shaft design installed to using predetermined refusal friction values based on soil conditions with upward resistance based on skin friction produced between the pile casing and the strata in which it is installed.

3. Bored and cast in place concrete friction piles utilizing a straight shaft design with the addition of a belled bottom to increase downward bearing capacity and a minor improvement in upward resistance capacity.

4. Helical screw piles made of steel which are limited in size relative to current available equipment capabilities as well are not suitable for all soil conditions being susceptible to buckling or shearing during installation.

5. The only design patent remotely similar in design is as follows: CA 1046781 which adds some downward load bearing capacity to a standard pile installation.
The primary concept Fig 1 is a method for the addition of telescopic protrusions of various shape and size to be penetrated into the earth throughout the length of the pile installation process from within the shaft of the pile outwardly using various mechanical means thereby, increasing both load bearing capacities as well as uplift resistance relative to soil conditions and quantity of the surface area increased by the addition of said protruding extensions as compared to current state of the art methods used in construction.
The pile extension apparatus' may become part of a continuous pipe type pile assembly or inserted as individual sub-assemblies into cast in place concrete piles or other suitable materials of the future such as carbon fiber reinforced steels, fibreglass reinforced PVC or HDPE piles and the like.
This patent is intended to also for the methods of extending the telescopic earth rams in the surrounding strata by way of integrated multistage explosive charges, integrated chemical reactions resulting in pressurization of the extending telescopic assemblies such as the dissolution of NaOH in water to create steam pressure within the telescopic components and any other hydraulically pressurized internal membrane means.
This patent is intended to also for all resulting devices and equipment yet to be invented if developed for or intended for the use of adding and extending telescopic or non-telescopic horizontal extensions applied to this piling process or specifications be they mechanical screw type or other means of extending root like anchorages from within the center of a pile installation.

Claims

Claims:

1. The addition of horizontal perpendicular telescoping protrusions of any practical geometrical shape Fig. 1 (3) as fabricated from current or future building materials will sufficiently and significantly increase capacities in both up and downward forces and act like anchor spikes into the surrounding Earth strata and lessen the required consideration of skin frictions in determining load or resistance capabilities.

2. Protrusions may be installed by any combination of several means of mechanical forces either by using existing modified telescopic hydraulic ram systems or other equipment attachments including extendable rotary drills or by the use of integral pile flexible membranes which may be pressurized and or inflated when air and or fluid tight bulkheads are installed at the top of the pile. Thus, allowing the inherent resulting pressure to extend the telescopic members into the Earth as in the case of pipe or similar solid form type geometries of piles or sub-assemblies. The use of explosive and or exothermic chemical reaction to provide the extensions with mechanical force and or pressures required to perform the mechanical extension motion into the earth has also been considered as part of this invention.

3. With the addition of telescopic extension in particular those of a triangular geometry randomly installed throughout the length of the pile, significant resistance to seismic waves can be achieved by way of the extension acting as seismic buffers disbursing shock waves into the surrounding strata prior to striking the core of the pile as installed increasing stability in Earthquake risk zones of construction. This results in a lessening of the transfer of seismic vibration into the building structure being supported by such piles thereby adding to the benefits of existing foundation vibration dampening systems.

4. Due to the dramatic increase surface area frictions and the addition of shear strength coefficients in the material capacities of the extending parts, more shallow depth piles may be used to obtain an equivalent load capacity to current methods in all directions of applied force.

5. Due to the dramatic increase surface area frictions and the addition of shear strength coefficients in the material capacities of the extending parts fewer piles overall are required to support an equivalent foundation and or building loads. An increase in wind shear resistance is also obtained thereby allowing for taller structures to be built higher than current capabilities permit.