US20020176749A1 - Method and apparatus for lifting, leveling, amd underpinning a building foundation - Google Patents
Method and apparatus for lifting, leveling, amd underpinning a building foundation Download PDFInfo
- Publication number
- US20020176749A1 US20020176749A1 US09/864,653 US86465301A US2002176749A1 US 20020176749 A1 US20020176749 A1 US 20020176749A1 US 86465301 A US86465301 A US 86465301A US 2002176749 A1 US2002176749 A1 US 2002176749A1
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- US
- United States
- Prior art keywords
- foundation
- base plate
- jack
- screw
- anchor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000009424 underpinning Methods 0.000 title claims description 10
- 239000004568 cement Substances 0.000 claims abstract description 19
- 238000003466 welding Methods 0.000 claims abstract description 3
- 238000009736 wetting Methods 0.000 claims abstract description 3
- 238000005086 pumping Methods 0.000 abstract description 2
- 239000002689 soil Substances 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D35/00—Straightening, lifting, or lowering of foundation structures or of constructions erected on foundations
Definitions
- the apparatus further includes the jack plate assembly, which is slidable upon the anchor shaft 24 or its coupled extension shafts 26 .
- Shafts 24 or 26 may be solid rods or heavy wall tubular.
- Jack plate assembly 20 is comprised of a base plate 28 attached to a tubular collar 30 , slidable upon the shafts 24 , 26 , and supported by a gusset 32 .
- the collar 30 and the gusset 32 are attached perpendicularly to the jack plate 28 at an approximate angle of 15 degrees.
- a second jack plate 34 is provided but not attached to help strengthen the base jack plate 28 .
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A method and apparatus for leveling a building foundation including excavating a cavity below the portion of the foundation to be raised at regular intervals and using and an oversized screw anchor driven under the foundation at approximately 15 degrees relative to the foundation edge at each of the excavated cavities, the anchor having relatively large helical screw flighting or auger plate to insure support at relatively shallow depths. Each excavated cavity is provided with a bed of dry cement mix. The method includes the steps of installing an anchor jack-plate upon said bed of dry cement the jack plate having a collar and gusset attached thereto slidable upon the screw anchor shaft, providing a pair of hydraulic jacks atop the anchor plate, taking a portion of the foundation load on each jack, thereby directing the load at each jack in axial alignment with the helical screw anchor flighting or auger plate, setting the cement by wetting and welding the collar of the anchor jack-plate to the screw anchor shaft only when the foundation is considered level, installing a screw jack at each lifting point and removing the hydraulic jacks and pumping cement into any voids detected below the foundation footing.
Description
- 1. Field of the Invention
- This invention relates generally to a method and apparatus for lifting, leveling, and underpinning a building foundation where such foundation has fallen out of plumb as a result of soil movement below the foundation and more particularly to foundation leveling apparatus that utilizes screw anchors as an integral part of a support column.
- 2. General Background
- The prior art teaches various methods for raising, leveling, and underpinning foundations that have dropped or cracked as a result of movement of the supporting soil on which the foundation was laid. These concepts include the process of excavating a portion of the soil from below the foundation and constructing some form of underpinning in the form of columns which serve as a new footing for the foundation at strategic points and using these columns as a base for supporting screw jacks to bring the building foundation back into a level plane. Others teach the use of screw anchors as support columns for the screw jacks. In most cases the foundation is first raised to a near level condition by some type of cantilever jacking apparatus in form of an “L”-shaped shoe inserted under the edge of the foundation. In some cases the jack shoe is supported from one or more screw anchors. In other cases the shoe is simply left in position as a permanent support when the foundation reaches a level plane, while others provide a cement pier of some sort for support of a permanent screw jack. In either case the screw jack may be adjusted at a later date if necessary to compensate for soil settling.
- Several problems occur when these procedures are implemented. In some case the screw anchor is not driven to a sufficient depth to insure stability or the angle of penetration is improper. Therefore, when the jack is loaded, the anchor bends or excessive stress is placed on the foundation due to improper point loading. Where cement piers are used they are often not level, thereby causing the jacks to stress the foundation by improper point loading. Providing sufficient support at proper intervals and lifting uniformly is essential to prevent foundation stress and further cracking. Therefore, a more reliable and inexpensive method is desirable to reduce the cost of materials and man-hours per lift point while insuring uniform loading at each lift point.
- The present invention teaches a method and apparatus for leveling a building foundation. The method including excavating a cavity below the portion of the foundation to be raised at regular intervals and using and an over-sized screw anchor driven under the foundation at approximately 15 degrees relative to the foundation edge at each of the excavated cavities, the anchor having relatively large helical screw flighting or auger plate to insure support at relatively shallow depths, providing a bed of dry cement mix at each of the excavated cavities, installing an anchor jack-plate having a collar and gusset attached thereto slidable upon the screw anchor shaft, providing a pair of hydraulic jacks atop the anchor plate, taking a portion of the foundation load on each jack, thereby directing the load at each jack in axial alignment with the helical screw anchor flighting or auger plate, setting the cement by wetting and welding the collar of the anchor jack-plate to the screw anchor shaft only when the foundation is considered level, installing a screw jack at each lifting point and removing the hydraulic jacks and pumping cement into any voids detected below the foundation footing.
- For a further understanding of the nature and objects of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings, in which, like parts are given like reference numerals, and wherein:
- FIG. 1 is an isometric illustration view of the preferred embodiment as implemented;
- FIG. 2 is an isometric exploded view of the preferred embodiment and its implementation;
- FIG. 3 is an isometric sectional view of the preferred embodiment and its implementation with hydraulic jacks;
- FIG. 4 is an isometric sectional view of the preferred embodiment and its implementation with a screw jack;
- FIG. 5 is a cross section view taken along sight lines5-5 as seen in FIG. 1;
- FIG. 6 is a cross section view taken along sight lines6-6 as seen in FIG. 1;
- As illustrated in FIG. 1, foundation leveling is usually required as a result of movement in the
soil 10 providing support for the foundation. Such movement often results incracks 14 in thefloor slabs 12, etc. In such cases it has been found that floatingpiers 16 stabilized by ascrew anchor 18 located at strategic points around thefoundation 12 are very effective and inexpensive in raising and leveling a foundation if applied in a unique manner using a uniquejack plate assembly 20 as seen in FIG. 2. The leveling apparatus includes thescrew anchor assembly 18, which is comprised of thescrew blade portion 22 and theshaft portion 24 which may be extended by coupling additional shaft lengths as necessary to allow the anchor to reach a stable earth formation. Making the screw auger blades or flighting 22 oversized, relative to general practice, typically in the range of 18 to 24 inches in diameter, stability may be achieved at a much shallower depth. The apparatus further includes the jack plate assembly, which is slidable upon theanchor shaft 24 or its coupledextension shafts 26.Shafts Jack plate assembly 20 is comprised of abase plate 28 attached to atubular collar 30, slidable upon theshafts gusset 32. Thecollar 30 and thegusset 32 are attached perpendicularly to thejack plate 28 at an approximate angle of 15 degrees. Asecond jack plate 34 is provided but not attached to help strengthen thebase jack plate 28. - As seen in FIG. 2,
excavations 36 are made below thefoundation 12 at a number of locations around the foundation as necessary to effectively lift the foundation as illustrated in FIG. 1. Theanchor assembly 18 is screw driven in the earth at an angle of approximately 15 degrees relative to the outer edge of thefoundation 12 in such a manner that the screw anchor's auger blade orhelical flighting 22 is located substantially under the foundation. As seen in FIG. 3, the excavation may then be partially filled withdry cement mix 38, thereby forming a bed to support thejack plate assembly 20. A pair of heavy-duty hydraulic jacks may then be placed on the jack plate assembly, which is still slidable upon theshafts jacks 40, thejack plate assembly 20 is guided and prevented from tipping by theshafts cement mix 38. Thegusset plate 32 further prevents rotation of thejack plate assembly 20 relative to thecement mix 38. When maximum compression is reached, thefoundation 12 is forced upwards to the desired elevation. When thehydraulic jacks 40 have elevated the foundation to the desired height, a screw jack serving as an under pinning element may be inserted between the hydraulic jacks and rotated to sustain the full load of the hydraulic jacks, at which time thehydraulic jacks 40 may be removed as shown in FIG. 4. As seen in FIG. 5, the central axis of thescrew jack 42 is aligned with the vertical central axis of thescrew anchor assembly 18. In FIG. 6 we see that, when placed properly, the central vertical axis of the screw jack also passes through the central axis of thescrew anchor assembly 18 at or about the blades or flighting of the screw anchor, which is the point of maximum support. Theanchor shaft collar 30 atpoint 50, thereby transferring a portion of the axial load of the foundation to thescrew anchor 18. Any remaining portion of theanchor shaft collar 30 may be removed, if desired, to prevent any obstruction above ground level. Water may be added to thecement mix 38 to stabilize the mix and thus form thefloating piers 16 seen in FIG. 1. Fill material, such as earth or cement, may also be added to the excavations and below thefoundation 12 at any accessible areas around the foundation as needed to further stabilize the foundation. - Because many varying and different embodiments may be made within the scope of the inventive concept herein taught, and because many modifications may be made in the embodiments herein detailed in accordance with the descriptive requirement of the law, it is to be understood that the details herein are to be interpreted as illustrative and not in any limiting sense.
Claims (7)
1. A foundation underpinning apparatus comprising:
a) a screw anchor assembly having an extendable shaft portion and an auger blade portion; and
b) a first base plate assembly comprising:
i) a base plate;
ii) a tubular collar slidable upon said shaft portion attached perpendicular to one edge of said first base plate; and
iii) a gusset plate attached perpendicular to said first base plate and said tubular collar.
2. The foundation underpinning apparatus according to claim 1 wherein said collar is attached to said base plate and said gusset at an approximate angle of 15 degrees.
3. The foundation underpinning apparatus according to claim 1 wherein said auger blade portion is between 18- and 24 inches in diameter.
4. The foundation underpinning apparatus according to claim 1 wherein said apparatus further comprises a second base plate placed parallel and in contact with said first base plate.
5. A method for lifting and underpinning a building foundation comprising the steps of:
a) excavating at least one cavity below the perimeter of a building foundation;
b) inserting a screw anchor having an extendable shaft portion and an auger portion at an angle of approximately 15 degrees relative to the outer vertical edge of the building foundation to a sufficient depth to insure stability and extending said anchor as necessary to reach the surface of the foundation;
c) filling at least a portion of said cavity with dry cement mix forming a bed therein;
d) providing and installing a first base plate assembly comprising a base plate, a tubular collar, slidable upon said shaft portion, attached perpendicular to one edge of said first base plate; and a gusset plate attached perpendicular to said first base plate and said tubular collar at vertical angle of approximately 15 degrees and in such a manner that said gusset plate is pressed into said cement mix and said base plate rests on the surface of said bed;
e) providing a second base plate parallel to and in contact with said first base plate;
f) installing at least one hydraulic jack vertically between said second base plate and said foundation;
g) actuating said hydraulic jack; thereby lifting said foundation to near level plane;
h) providing and installing a screw jack adjacent said hydraulic jack and adjusting said screw jack to take the full load of said hydraulic jack and removing said hydraulic jack;
i) wetting said cement mix sufficiently to form a cement pier; and
j) welding said collar to said screw anchor and removing any excess portion of said shaft.
6. The method according to claim 5 further comprising the step of placing said screw jack in a manner whereby the vertical axis of said screw jack is aligned with the vertical central axis of the shaft of said screw anchor and the vertical axis of said screw jack crosses the vertical axis of said shaft at the approximate location of said auger portion.
7. The method according to claim 5 wherein the load of said foundation is divided between said cement pier and said screw anchor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/864,653 US20020176749A1 (en) | 2001-05-23 | 2001-05-23 | Method and apparatus for lifting, leveling, amd underpinning a building foundation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/864,653 US20020176749A1 (en) | 2001-05-23 | 2001-05-23 | Method and apparatus for lifting, leveling, amd underpinning a building foundation |
Publications (1)
Publication Number | Publication Date |
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US20020176749A1 true US20020176749A1 (en) | 2002-11-28 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/864,653 Abandoned US20020176749A1 (en) | 2001-05-23 | 2001-05-23 | Method and apparatus for lifting, leveling, amd underpinning a building foundation |
Country Status (1)
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US (1) | US20020176749A1 (en) |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040091322A1 (en) * | 2002-07-22 | 2004-05-13 | Donald May | Apparatus and method for supporting a structure with a pier |
US20070048095A1 (en) * | 2005-08-12 | 2007-03-01 | Schnabel Foundation Company | Supported Underpinning Piers |
CN100357554C (en) * | 2006-06-30 | 2007-12-26 | 山东建筑大学 | Method for supporting and replacing bed plate foundation |
US20090320387A1 (en) * | 2008-06-27 | 2009-12-31 | Innovida Factories, Ltd. | Sandwich panel ground anchor and ground preparation for sandwich panel structures |
FR2943081A1 (en) * | 2009-03-16 | 2010-09-17 | Giuseppe Incarnato | Foundation straightening device for masonry construction, has hydraulic jack inserted between cast in-situ reinforced concrete block and foundation that includes concrete connection rupture and crack formation of superstructure walls |
US8429859B2 (en) * | 2011-08-01 | 2013-04-30 | Source Of Pride, Llc | Apparatus for supporting a cemetery headstone and method of fabricating same |
US8782991B2 (en) | 2008-07-10 | 2014-07-22 | Millport Associates S.A. | Building roof structure having a round corner |
US8875475B2 (en) | 2013-03-14 | 2014-11-04 | Millport Associates S.A. | Multiple panel beams and methods |
US9051708B2 (en) * | 2013-02-01 | 2015-06-09 | Franklin Brown | Tower foundation |
US9279227B2 (en) | 2014-01-31 | 2016-03-08 | J. Stephen West | Foundation pier system |
JP2016065386A (en) * | 2014-09-24 | 2016-04-28 | 株式会社大林組 | Displacement adjustment method in under-pinning and jack control system using the same |
JP6207114B1 (en) * | 2017-07-13 | 2017-10-04 | 株式会社みらい技術研究所 | Steel pipe pile construction method in underpinning method |
US20200087880A1 (en) * | 2018-09-18 | 2020-03-19 | Jesse B. Trebil | Foundation pier bracket system |
US10947694B2 (en) * | 2019-07-04 | 2021-03-16 | Korea Institute Of Civil Engineering And Building Technology | Preloading apparatus for adjusting load and method of reinforcing foundation using the same |
US11142920B2 (en) * | 2018-05-22 | 2021-10-12 | Independence Materials Group, Llc | Wall brace system and method |
US11155976B1 (en) * | 2018-09-11 | 2021-10-26 | Glenn P. Gillen | Precast deep foundation system |
US11203851B2 (en) * | 2019-07-04 | 2021-12-21 | Korea Institute Of Civil Engineering And Building Technology | Foundation reinforcing apparatus using bracing-type supporting structure and lateral prestressing device and method of reinforcing foundation using the same |
USD942331S1 (en) * | 2020-06-17 | 2022-02-01 | Sandra Wilburn | Portable blowup underpinning for trailers |
US20220042273A1 (en) * | 2020-07-14 | 2022-02-10 | Mark Anthony S. Dimitrijevic | Structural support and stabilization assemblies and methods for installing same |
-
2001
- 2001-05-23 US US09/864,653 patent/US20020176749A1/en not_active Abandoned
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040091322A1 (en) * | 2002-07-22 | 2004-05-13 | Donald May | Apparatus and method for supporting a structure with a pier |
US7044686B2 (en) * | 2002-07-22 | 2006-05-16 | Donald May | Apparatus and method for supporting a structure with a pier |
US20070048095A1 (en) * | 2005-08-12 | 2007-03-01 | Schnabel Foundation Company | Supported Underpinning Piers |
CN100357554C (en) * | 2006-06-30 | 2007-12-26 | 山东建筑大学 | Method for supporting and replacing bed plate foundation |
US20090320387A1 (en) * | 2008-06-27 | 2009-12-31 | Innovida Factories, Ltd. | Sandwich panel ground anchor and ground preparation for sandwich panel structures |
US8733033B2 (en) * | 2008-06-27 | 2014-05-27 | Millport Associates, SA | Sandwich panel ground anchor and ground preparation for sandwich panel structures |
US8782991B2 (en) | 2008-07-10 | 2014-07-22 | Millport Associates S.A. | Building roof structure having a round corner |
FR2943081A1 (en) * | 2009-03-16 | 2010-09-17 | Giuseppe Incarnato | Foundation straightening device for masonry construction, has hydraulic jack inserted between cast in-situ reinforced concrete block and foundation that includes concrete connection rupture and crack formation of superstructure walls |
US8429859B2 (en) * | 2011-08-01 | 2013-04-30 | Source Of Pride, Llc | Apparatus for supporting a cemetery headstone and method of fabricating same |
US8555561B2 (en) * | 2011-08-01 | 2013-10-15 | Source Of Pride, Llc | Apparatus for supporting a cemetery headstone and method of fabricating same |
US9051708B2 (en) * | 2013-02-01 | 2015-06-09 | Franklin Brown | Tower foundation |
US8875475B2 (en) | 2013-03-14 | 2014-11-04 | Millport Associates S.A. | Multiple panel beams and methods |
US9279227B2 (en) | 2014-01-31 | 2016-03-08 | J. Stephen West | Foundation pier system |
JP2016065386A (en) * | 2014-09-24 | 2016-04-28 | 株式会社大林組 | Displacement adjustment method in under-pinning and jack control system using the same |
JP6207114B1 (en) * | 2017-07-13 | 2017-10-04 | 株式会社みらい技術研究所 | Steel pipe pile construction method in underpinning method |
US11142920B2 (en) * | 2018-05-22 | 2021-10-12 | Independence Materials Group, Llc | Wall brace system and method |
US11686115B2 (en) | 2018-05-22 | 2023-06-27 | Independence Materials Group, Llc | Wall brace system and method |
US11155976B1 (en) * | 2018-09-11 | 2021-10-26 | Glenn P. Gillen | Precast deep foundation system |
US11268253B2 (en) * | 2018-09-18 | 2022-03-08 | Jesse B. Trebil | Foundation pier bracket system |
US20200087880A1 (en) * | 2018-09-18 | 2020-03-19 | Jesse B. Trebil | Foundation pier bracket system |
US11808004B2 (en) * | 2018-09-18 | 2023-11-07 | Jesse B. Trebil | Foundation pier bracket system |
US20220170224A1 (en) * | 2018-09-18 | 2022-06-02 | Jesse B. Trebil | Foundation pier bracket system |
US10947694B2 (en) * | 2019-07-04 | 2021-03-16 | Korea Institute Of Civil Engineering And Building Technology | Preloading apparatus for adjusting load and method of reinforcing foundation using the same |
US11203851B2 (en) * | 2019-07-04 | 2021-12-21 | Korea Institute Of Civil Engineering And Building Technology | Foundation reinforcing apparatus using bracing-type supporting structure and lateral prestressing device and method of reinforcing foundation using the same |
USD942331S1 (en) * | 2020-06-17 | 2022-02-01 | Sandra Wilburn | Portable blowup underpinning for trailers |
US20220042273A1 (en) * | 2020-07-14 | 2022-02-10 | Mark Anthony S. Dimitrijevic | Structural support and stabilization assemblies and methods for installing same |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |