GB2154636A - Improved precast concrete pile and method of placing it in the ground - Google Patents
Improved precast concrete pile and method of placing it in the ground Download PDFInfo
- Publication number
- GB2154636A GB2154636A GB08405141A GB8405141A GB2154636A GB 2154636 A GB2154636 A GB 2154636A GB 08405141 A GB08405141 A GB 08405141A GB 8405141 A GB8405141 A GB 8405141A GB 2154636 A GB2154636 A GB 2154636A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pile
- precast concrete
- concrete pile
- ground
- cross sections
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/58—Prestressed concrete piles
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- 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 precast concrete pile P which includes a tapered end 2 and alternating enlarged cross-sections and contracted cross-sections throughout its length is driven into the ground together with a soil solidifying agent supply pipe 11 and a cement slurry supply pipe 12. The pile footing in the ground is formed with concrete formations around the contracted sections, thereby increasing the bearing capacity of the pile footing. <IMAGE>
Description
SPECIFICATION
Improved precast concrete pile and method of placing it in the ground
This invention relates to pile footings, particularly to a novel precast concrete pile and a method of placing a pile in the ground by which a foundation can be reinforced.
It is known in the art that pile footings are driven into the ground to support and strengthen the superstructures. There is a type of reinforced concrete pile which is of uniform cross section with a tapered end and which can be driven into the ground directly by pile driving equipment. As the pile cross section is uniform, the friction between the pile and the surrounding earth is insufficient to prevent the sinking of the pile due to high load, earthquake, etc., unless the pile is driven until it reaches a hard bearing stratum. The sinking of the foundation easily happens in the loose earth, such as that area around coast-lines, seashores, etc.
There is also another type of pile called a "cast-in-place" pile which includes a casing and an iron core. They are driven into the ground together, and, once in place, the core is pulled, and a concrete mixture is poured into the casing about 4 to 1 2 feet height.
Then the iron core is again put into the casing, and subsequently the casing is pulled out about 2 to 4 feet. The concrete mixture is compressed by driving the core with a pile driver so that an enlarged base is formed.
Thereafter, the iron core is completely pulled out, and the casing is filled with a concrete mixture. Finally the casing is pulled out. The formed pile has a uniform cross section structure and an enlarged base. However, such pile footing is still unsatisfactory for strengthening the foundation of the superstructure.
An object of the invention is to provide a reinforced concrete pile of improved construction which can offer considerable friction forces in relation to the surrounding earth, thereby increasing the bearing capacity and stability of the pile.
The foregoing and other objects can be achieved in accordance with the invention through the provision of a precast concrete pile which includes an elongated concrete structure with a tapered end provided at its lowest point and alternating enlarged cross sections and contracted cross sections throughout its length, each of said enlarged cross sections being provided with a longitudinal groove so as to receive a longitudinal pipe.
Alternatively, the precast concrete pile may comprise an elongated concrete structure which has a tapered end provided at its lower point and has alternating enlarged cross sections and contracted cross sections throughout its length, each of said enlarged portions being provided with a longitudinal groove, a pipe longitudinally received in said groove, and a means for fastening said pipe to said concrete structure provided near the two ends of said structure.
In accordance with the invention, a method for placing a reinforced concrete pile footing may comprise: making a precast concrete pile which has an elongated concrete structure, a tapered end provided at its lowest side, with alternating enlarged cross sections and contracted cross sections throughout its length, each of said portions being provided with a longitudinal groove; fastening a longitudinal pipe to said precast concrete pile and cause it to be received in said groove; driving said pile into the ground; inserting soil solidifying agent through said pipe and gradually pulling out said pipe simultaneously. The method may further include the step of introducing a cement slurry through another pipe and gradually pulling out said pipe simultaneously.
The presently preferred exemplary embodiment will be described in detail with reference to the following drawings, wherein:
Figure 1 is an elevation view of a precast concrete pile constructed according to the present invention;
Figure 2 is a sectioned view of the same precast pile of Fig. 1;
Figures 3 to 6 show the successive operations for driving the same precast pile; and
Figure 7 shows a sectioned view after the precast pile is in place in the ground.
Referring to Figs. 1 and 2, there is shown a precast concrete pile p which is comprised of a cylindrical concrete structure 1 having a tapered end 2 and reinforced with steel wires 3a and 3b. The concrete structure 1 is provided with enlarged cross sections 4 which alternate with contracted sections 5 throughout the length of the pile p. Each of the enlarged cross sections 4 is provided with two pairs of diametrically opposite grooves 6 for receiving pipes 11 and 1 2. At the tapered end 2 is provided metal fence members 8a and 8b.
Near two ends of the structure 1 are provided fastening means 9a and 9b which have sleeve members 10a and 10b. The sleeves 1 0a and 1 0b respectively hold soil solidifying agent supply pipes 11 and cement slurry supply pipes 1 2 which are diametrically opposite and received in the grooves 6 of the enlarged cross section portions 4 so that these pipes 11 and 1 2 are closely adjacent to the contracted portions 5.
Figs. 3 to 6 illustrates the construction operations of a pile footing by using the precast pile p. The pile p which is incorporated with pipes 11 and 1 2 is driven into the bed of soil A until reaching the desired depth in a usual way by means of a pile driver (see
Fig. 3). A soil solidifying agent, such as water glass is introduced to the surrounding area of the pile p through the pipes 11 which are gradually pulled out. As the pipes 11 rise, the soil solidifying agent penetrates into and solidifies the surrounding soil (see Fig. 4).
After a period sufficient for the solidification of the soil, generally about 10 seconds or 1 to 2 minutes, the cement slurry is introduced into the pipe 1 2 by means of a cement slurry pump. At the same time, the pipes 1 2 are gradually pulled out. As the pipes 1 2 rise, the cement slurry penetrates into the surrounding solidified soil, and fill the spaces around the contracted portions 5 and grooves 6 left by the removal of pipes 1 2 (see Fig. 5). The surrounding soil B is impregnated with the concrete and is therefore reinforced. Additionally, this process also results in concrete formations C around the contracted portions 5 which are incorporated with the pile p and concrete formation D in the grooves 6 (see
Figs. 6 and 7).
The soil solidifying agent used in the invention is preferably water glass which has good penetrating characteristics and high-speed solidifying characteristic. After supplying the soil solidifying agent, the cement slurry can easily penetrate into and impregnate the soil.
There is also an advantage in that, when the pile p is driven into the ground, the compressed surrounding soil hollowed to the diameter of the enlarged portions 4 temporarily will not refill the spaces around the portion 5, and thus, as the soil solidifying agent and cement slurry are introduced on completion of the driving action, the pouring of the soil solidifying agent and cement slurry can be smoothly carried out.
According to the invention not only the surrounding soil be reinforced, but also concrete formations C and D can be introduced which increase the bearing capacity of the pile and foundation stability. As the concrete formations C and D increase the friction between the pile P and the surrounding soil after the pile p is installed in the ground, sinking of the pile due to the high load of the superstructure or earthquake can be prevented. Due to the increased bearing capacity and stability of the pile footing, the amount of piles required can be reduced, thereby lowering the cost of constructing a pile foundation.
Further, when the pile p is driven, only enlarged portions 4 abut against the soil bed and therefore the frictional surface areas of the pile relative to the soil bed is less during the driving operation. Accordingly, this results in the reduction of the required driving power and an increase in the sinking rate of the pile during driving.
With the invention thus explained, it is apparent that obvious modifications and variations can be made without departing from the scope of the invention. It is therefore intended that the invention be limited only as indicated in the appended claims.
Claims (5)
1. A precast concrete pile comprising:
an elongate concrete structure which has a tapered end provided at its lowest side and has alternating enlarged cross sections and contracted cross sections throughout its length.
2. A precast concrete pile as claimed in
Claim 1, wherein each of said enlarged cross sections is provided with at least one longitudinal groove so as to receive at least one longitudinal pipe.
3. A method for placing a reinforced concrete pile footing comprising:
making a precast concrete pile which has an elongate concrete structure having a tapered end provided at its lower side and alternating enlarged cross sections and contracted cross sections throughout its length;
fastening a longitudinal pipe to said precast concrete pile;
driving said pile into the ground;
introducing a soil solidifying agent through said pipe into the ground and gradually pulling out said pipe simultaneously.
4. A method as claimed in Claim 3, further comprising the step of introducing a cement slurry through another pipe and gradually pulling out said pipe simultaneously.
5. A precast concrete pile as substantially hereinfore described with reference to the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08405141A GB2154636B (en) | 1984-02-28 | 1984-02-28 | Improved precast concrete pile and method of placing it in the ground |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08405141A GB2154636B (en) | 1984-02-28 | 1984-02-28 | Improved precast concrete pile and method of placing it in the ground |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8405141D0 GB8405141D0 (en) | 1984-04-04 |
GB2154636A true GB2154636A (en) | 1985-09-11 |
GB2154636B GB2154636B (en) | 1987-10-28 |
Family
ID=10557268
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08405141A Expired GB2154636B (en) | 1984-02-28 | 1984-02-28 | Improved precast concrete pile and method of placing it in the ground |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2154636B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2257737A (en) * | 1991-07-19 | 1993-01-20 | Roxbury Ltd | Hollow reinforced pile sections |
GB2261456A (en) * | 1991-11-12 | 1993-05-19 | Bing Wing Choy | A shoe for a concrete pile |
GB2414032A (en) * | 2004-05-11 | 2005-11-16 | Shire Structures Ltd | Pile with adjustable level of friction / bearing |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB287447A (en) * | 1927-03-19 | 1928-07-12 | Shojiro Takechi | Improvements in method and apparatus for concrete piling |
GB456607A (en) * | 1935-08-26 | 1936-11-12 | Leslie Turner | Improvements in preformed piles |
GB1377838A (en) * | 1971-12-13 | 1974-12-18 | Baker Oil Tools Inc | Method for anchoring piling |
-
1984
- 1984-02-28 GB GB08405141A patent/GB2154636B/en not_active Expired
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB287447A (en) * | 1927-03-19 | 1928-07-12 | Shojiro Takechi | Improvements in method and apparatus for concrete piling |
GB456607A (en) * | 1935-08-26 | 1936-11-12 | Leslie Turner | Improvements in preformed piles |
GB1377838A (en) * | 1971-12-13 | 1974-12-18 | Baker Oil Tools Inc | Method for anchoring piling |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2257737A (en) * | 1991-07-19 | 1993-01-20 | Roxbury Ltd | Hollow reinforced pile sections |
GB2261456A (en) * | 1991-11-12 | 1993-05-19 | Bing Wing Choy | A shoe for a concrete pile |
GB2261456B (en) * | 1991-11-12 | 1995-08-02 | Bing Wing Choy | Concrete pile |
GB2414032A (en) * | 2004-05-11 | 2005-11-16 | Shire Structures Ltd | Pile with adjustable level of friction / bearing |
GB2414032B (en) * | 2004-05-11 | 2008-12-10 | Shire Structures Ltd | Improvements in or relating to piles |
Also Published As
Publication number | Publication date |
---|---|
GB8405141D0 (en) | 1984-04-04 |
GB2154636B (en) | 1987-10-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |