CN112323785A - Deep foundation pile with enlarged head and construction method thereof - Google Patents
Deep foundation pile with enlarged head and construction method thereof Download PDFInfo
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- CN112323785A CN112323785A CN202011317337.7A CN202011317337A CN112323785A CN 112323785 A CN112323785 A CN 112323785A CN 202011317337 A CN202011317337 A CN 202011317337A CN 112323785 A CN112323785 A CN 112323785A
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- pile
- pipe
- outer pipe
- head
- ramming
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- 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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
Abstract
The invention discloses a deep foundation pile with an enlarged head and a construction method thereof, wherein the deep foundation pile comprises a pile body and the enlarged head at the bottom of the pile, and the enlarged head sequentially comprises a cushion layer, a bottom step and a high step from outside to inside; the cushion layer is formed by soil bodies below the extruded fillers; the bottom step is formed by extruding filling materials; the high order is formed by tamping concrete filling materials. The invention has controllable flow, safe and reliable quality and convenient construction. The foundation of the invention has good expansion performance, can be used as a green assembly type building to explore and innovate underground space geotechnical engineering, and conforms to the development direction of national green buildings.
Description
Technical Field
The invention relates to a pile and a construction method thereof.
Background
The existing deep foundation pile generally needs to be constructed by an enlarged head, the constructed enlarged head is generally of a single-layer structure, the expansion performance is not ideal, and further improvement is needed.
Disclosure of Invention
The invention aims to provide a deep foundation pile with an expanded head and good foundation expansion performance and a construction method thereof.
The technical solution of the invention is as follows:
the deep foundation pile with the enlarged head comprises a pile body and the enlarged head at the bottom of the pile, and is characterized in that: the expanded head comprises a cushion layer, a bottom step and a high step from outside to inside in sequence; the cushion layer is formed by soil bodies below the extruded fillers; the bottom step is formed by extruding filling materials; the high order is formed by tamping the filling material.
The pile body includes a peripheral pile as a first pile and a core pile as a second pile, the core pile being inserted into the high stage of the enlarged head.
The second pile is an outer prefabricated inner cast-in-place pile or an inner prefabricated outer cast-in-place pile.
A construction method of a deep foundation pile with an enlarged head comprises pile body construction and pile bottom enlarged head construction, and is characterized in that: the construction of the pile bottom enlarged footing comprises the following steps:
(a) the filling material is thrown into the outer pipe, potential energy repeatedly acts on the filling material in the outer pipe through the inner ramming pipe, the inner ramming pipe hammer and/or the mother-child pipe hammer arranged in the inner ramming pipe, and one or a combination of more of inner ramming, inner pressure, inner ramming pressure, inner impact, inner ramming and inner ramming pressure is/are carried out, and the outer pipe is not pulled out, i =0, or is pulled out less; the drawing height Hi of the outer pipe is not more than the feeding height Hi every time, Σ Hi is not more than Σ Hi, the compaction degree of the soil body is adjusted by adjusting a compaction coefficient M ∈ (D, Y, Z, V), wherein D is the sinking amount under impact energy, which is called penetration for short, and Y is the pile pressing force which basically does not sink under static pressure energy, which is called final pressure for short; z is the vibration energy value which basically does not sink under the vibration energy, called the final vibration value for short, and V is the feeding volume added by multiple times of feeding, called the feeding amount for short; the filling material in the outer pipe extrudes the outer pipe, the soil mass below the outer pipe is compacted, and the deep soil mass below the outer pipe is compacted to form a cushion layer of the expanded foundation;
(b) the method comprises the following steps of (1) putting a filling material into an outer pipe, repeatedly acting potential energy on the filling material in the outer pipe through one or a combination of an inner ramming pipe, an inner ramming pipe hammer and/or a mother-child pipe hammer arranged in the inner ramming pipe, inner ramming pressure, inner impact, inner ramming and inner ramming pressure, pulling up the outer pipe h to a certain height h which is more than or equal to 0, extruding the filling material in the outer pipe out of the outer pipe to form a bottom step of an expansion foundation, and forming the bottom step of the expansion foundation;
(c) adding a filling material into the outer pipe, and adjusting the size and the shape of the expansion head by adjusting the form coefficient alpha epsilon (H, H, c, E, D and V); h is the feeding height, H is the pulling height of the outer pipe, c is the distance between the bottom of the outer pipe and the bottom of the pile when tamping and expanding are finished, E is the distance between the bottom of the inner tamping system and the bottom of the outer pipe when tamping and expanding are finished, D is the penetration degree of the tamping filler under the set impact energy, and V is the volume of the tamping filler; obtaining an expanded head high order of an expanded foundation;
after the high-order formation of the expanded head, the construction is further carried out by adopting one of the following methods: (a) the inner rammer hammer freely falls to repeatedly punch and shear the high-order of the expansion head below the outer pipe to form a concave body in the expansion head; (b) the length of the inner ramming pipe is less than that of the outer pipe, and the high-order of the expansion head below the outer pipe is synchronously sheared under the action of the potential energy of the ramming pipe hammer double-immersed pipe system in the outer immersed pipe to form a concave body in the expansion head; (c) the length of the inner pipe rammer is larger than that of the outer pipe, and the high-order expanding head below the outer pipe is repeatedly sheared by the inner pipe rammer main and sub hammer double-immersed pipe built-in hammer system to form a concave body in the expanding head.
After a concave body in the pile bottom expansion head is formed, a pile body is poured to form a pointed and bullet type expansion head anchor pile anchored into the expansion head by a set depth; or firstly placing deformable and compressible materials into the concave body of the enlarged head, and pouring the pile body to form the deformable controllable-settlement controlled pile.
Firstly, constructing a first pile, wherein the first pile is a cast-in-place pile; constructing a second pile;
the second pile construction method is one of the following methods:
A) the second pile is an external prefabricated and internal cast-in-place pile, and the construction method comprises the following steps:
(1) in-place: the outer pipe is concentrically positioned on a set first pile position;
(2) sinking the tube: sinking the outer pipe to a set depth;
(3) bottom expanding: carrying out bottom expanding construction according to a construction method of the pile bottom expanding head;
(4) no-pipe-drawing pouring molding: placing the reinforcement cage into the outer pipe, and pouring fluid concrete to form a reinforced concrete mixed pile body in the outer steel pipe;
the second pile is an inner prefabricated and outer cast-in-place pile, and the construction method comprises the following steps:
(1) in-place: the outer pipe is concentrically positioned on a set first pile position;
(2) sinking the tube: sinking the outer pipe to a set depth;
(3) bottom expanding: carrying out bottom expanding construction according to a construction method of the pile bottom expanding head;
(4) pipe drawing and pouring molding: the prefabricated pile is placed into the outer pipe, the hammer of the inner tamping pipe is propped against the prefabricated pile head, the filler is put into a cavity between the outer pipe and the prefabricated pile body, the prefabricated pile is vibrated, pressed and pulled upwards, the prefabricated pile is repeatedly vibrated, pressed and sunk and then pulled upwards, the filler fills the cavity, and the terrace pulled out of the outer pipe forms a convex, concave and convex or bamboo-like filler pile body.
The invention has controllable flow, safe and reliable quality and convenient construction. The foundation of the invention has good expansion performance, can be used as a green assembly type building to explore and innovate underground space geotechnical engineering, and conforms to the development direction of national green buildings.
Drawings
The invention is further illustrated by the following figures and examples.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
A deep foundation pile with an enlarged head comprises a pile body and the enlarged head at the bottom of the pile, wherein the enlarged head comprises a cushion layer 1, a bottom step 2 and a high step 3 from outside to inside in sequence; the cushion layer is formed by soil bodies below the extruded fillers; the bottom step is formed by extruding filling materials; the high order is formed by tamping the filling material.
The shaft comprises a peripheral pile 4 as a first pile and a core pile 5 as a second pile, which is inserted in the high stage of the enlarged head.
The second pile is an external prefabricated internal cast-in-place pile (namely, the external layer is a prefabricated structure, and the internal layer is a cast-in-place structure) or an internal prefabricated external cast-in-place pile (namely, the internal layer is a prefabricated structure, and the external layer is a cast-in-place structure).
A construction method of a deep foundation pile with an enlarged head comprises pile body construction and pile bottom enlarged head construction, and is characterized in that: the construction of the pile bottom enlarged footing comprises the following steps:
(a) the filling material is thrown into the outer pipe, potential energy repeatedly acts on the filling material in the outer pipe through the inner ramming pipe, the inner ramming pipe hammer and/or the mother-child pipe hammer arranged in the inner ramming pipe, and one or a combination of more of inner ramming, inner pressure, inner ramming pressure, inner impact, inner ramming and inner ramming pressure is/are carried out, and the outer pipe is not pulled out, i =0, or is pulled out less; the drawing height Hi of the outer pipe is not more than the feeding height Hi every time, Σ Hi is not more than Σ Hi, the compaction degree of the soil body is adjusted by adjusting a compaction coefficient M ∈ (D, Y, Z, V), wherein D is the sinking amount under impact energy, which is called penetration for short, and Y is the pile pressing force which basically does not sink under static pressure energy, which is called final pressure for short; z is the vibration energy value which basically does not sink under the vibration energy, called the final vibration value for short, and V is the feeding volume added by multiple times of feeding, called the feeding amount for short; the filling material in the outer pipe extrudes the outer pipe, the soil mass below the outer pipe is compacted, and the deep soil mass below the outer pipe is compacted to form a cushion layer of the expanded foundation;
(b) the method comprises the following steps of (1) putting a filling material into an outer pipe, repeatedly acting potential energy on the filling material in the outer pipe through one or a combination of an inner ramming pipe, an inner ramming pipe hammer and/or a mother-child pipe hammer arranged in the inner ramming pipe, inner ramming pressure, inner impact, inner ramming and inner ramming pressure, pulling up the outer pipe h to a certain height h which is more than or equal to 0, extruding the filling material in the outer pipe out of the outer pipe to form a bottom step of an expansion foundation, and forming the bottom step of the expansion foundation;
(c) adding a filling material into the outer pipe, and adjusting the size and the shape of the expansion head by adjusting the form coefficient alpha epsilon (H, H, c, E, D and V); h is the feeding height, H is the pulling height of the outer pipe, c is the distance between the bottom of the outer pipe and the bottom of the pile when tamping and expanding are finished, E is the distance between the bottom of the inner tamping system and the bottom of the outer pipe when tamping and expanding are finished, D is the penetration degree of the tamping filler under the set impact energy, and V is the volume of the tamping filler; obtaining an expanded head high order of an expanded foundation;
the filling material is one or more of loose granules, a curing agent and a cementing body, such as sand, broken bricks, broken concrete, recycled aggregate, cement soil, cement mortar, cement mixture and dry and wet concrete.
After the high-order formation of the expanded head, the construction is further carried out by adopting one of the following methods: (a) the inner rammer hammer freely falls to repeatedly punch and shear the high-order of the expansion head below the outer pipe to form a concave body in the expansion head; (b) the length of the inner ramming pipe is less than that of the outer pipe, and the high-order of the expansion head below the outer pipe is synchronously sheared under the action of the potential energy of the ramming pipe hammer double-immersed pipe system in the outer immersed pipe to form a concave body in the expansion head; (c) the length of the inner pipe rammer is larger than that of the outer pipe, and the high-order expanding head below the outer pipe is repeatedly sheared by the inner pipe rammer main and sub hammer double-immersed pipe built-in hammer system to form a concave body in the expanding head.
After a concave body in the pile bottom expansion head is formed, a pile body is poured to form a pointed and bullet type expansion head anchor pile anchored into the expansion head by a set depth; or the deformable and compressible material (such as sand and foam material) is firstly put into the concave body of the enlarged head, and the pile body is poured to form the deformable and controllable-settlement controlled pile.
Firstly, constructing a first pile, wherein the first pile is a cast-in-place pile; constructing a second pile;
the second pile construction method is one of the following methods:
A) the second pile is an external prefabricated and internal cast-in-place pile, and the construction method comprises the following steps:
(1) in-place: the outer pipe is concentrically positioned on a set first pile position;
(2) sinking the tube: sinking the outer pipe to a set depth;
(3) bottom expanding: carrying out bottom expanding construction according to a construction method of the pile bottom expanding head;
(4) no-pipe-drawing pouring molding: placing the reinforcement cage into the outer pipe, and pouring fluid concrete to form a reinforced concrete mixed pile body in the outer steel pipe;
the second pile is an inner prefabricated and outer cast-in-place pile, and the construction method comprises the following steps:
(1) in-place: the outer pipe is concentrically positioned on a set first pile position;
(2) sinking the tube: sinking the outer pipe to a set depth;
(3) bottom expanding: carrying out bottom expanding construction according to a construction method of the pile bottom expanding head;
(4) pipe drawing and pouring molding: the prefabricated pile is placed into the outer pipe, the hammer of the inner tamping pipe is propped against the prefabricated pile head, the filler is put into a cavity between the outer pipe and the prefabricated pile body, the prefabricated pile is vibrated, pressed and pulled upwards, the prefabricated pile is repeatedly vibrated, pressed and sunk and then pulled upwards, the filler fills the cavity, and the terrace pulled out of the outer pipe forms a convex, concave and convex or bamboo-like filler pile body.
Claims (6)
1. The deep foundation pile with the enlarged head comprises a pile body and the enlarged head at the bottom of the pile, and is characterized in that: the expanded head comprises a cushion layer, a bottom step and a high step from outside to inside in sequence; the cushion layer is formed by soil bodies below the extruded fillers; the bottom step is formed by extruding filling materials; the high order is formed by tamping the filling material.
2. The deep foundation pile with enlarged head as claimed in claim 1, wherein: the pile body includes a peripheral pile as a first pile and a core pile as a second pile, the core pile being inserted into the high stage of the enlarged head.
3. The deep foundation pile with enlarged head as claimed in claim 1 or 2, wherein: the second pile is an outer prefabricated inner cast-in-place pile or an inner prefabricated outer cast-in-place pile.
4. A method of constructing a deep foundation pile with an enlarged head according to claim 1, comprising constructing a pile body and an enlarged head at a pile bottom, wherein: the construction of the pile bottom enlarged footing comprises the following steps:
(a) the filling material is thrown into the outer pipe, potential energy repeatedly acts on the filling material in the outer pipe through the inner ramming pipe, the inner ramming pipe hammer and/or the mother-child pipe hammer arranged in the inner ramming pipe, and one or a combination of more of inner ramming, inner pressure, inner ramming pressure, inner impact, inner ramming and inner ramming pressure is/are carried out, and the outer pipe is not pulled out, i =0, or is pulled out less; the drawing height Hi of the outer pipe is not more than the feeding height Hi every time, Σ Hi is not more than Σ Hi, the compaction degree of the soil body is adjusted by adjusting a compaction coefficient M ∈ (D, Y, Z, V), wherein D is the sinking amount under impact energy, which is called penetration for short, and Y is the pile pressing force which basically does not sink under static pressure energy, which is called final pressure for short; z is the vibration energy value which basically does not sink under the vibration energy, called the final vibration value for short, and V is the feeding volume added by multiple times of feeding, called the feeding amount for short; the filling material in the outer pipe extrudes the outer pipe, the soil mass below the outer pipe is compacted, and the deep soil mass below the outer pipe is compacted to form a cushion layer of the expanded foundation;
(b) the method comprises the following steps of (1) putting a filling material into an outer pipe, repeatedly acting potential energy on the filling material in the outer pipe through one or a combination of an inner ramming pipe, an inner ramming pipe hammer and/or a mother-child pipe hammer arranged in the inner ramming pipe, inner ramming pressure, inner impact, inner ramming and inner ramming pressure, pulling up the outer pipe h to a certain height h which is more than or equal to 0, extruding the filling material in the outer pipe out of the outer pipe to form a bottom step of an expansion foundation, and forming the bottom step of the expansion foundation;
(c) adding a filling material into the outer pipe, and adjusting the size and the shape of the expansion head by adjusting the form coefficient alpha epsilon (H, H, c, E, D and V); h is the feeding height, H is the pulling height of the outer pipe, c is the distance between the bottom of the outer pipe and the bottom of the pile when tamping and expanding are finished, E is the distance between the bottom of the inner tamping system and the bottom of the outer pipe when tamping and expanding are finished, D is the penetration degree of the tamping filler under the set impact energy, and V is the volume of the tamping filler; and obtaining the expanded head high order of the expanded foundation.
5. The method of constructing a deep foundation pile with an enlarged head as set forth in claim 4, wherein: after the high-order formation of the expanded head, the construction is further carried out by adopting one of the following methods: (a) the inner rammer hammer freely falls to repeatedly punch and shear the high-order of the expansion head below the outer pipe to form a concave body in the expansion head; (b) the length of the inner ramming pipe is less than that of the outer pipe, and the high-order of the expansion head below the outer pipe is synchronously sheared under the action of the potential energy of the ramming pipe hammer double-immersed pipe system in the outer immersed pipe to form a concave body in the expansion head; (c) the length of the inner pipe rammer is greater than that of the outer pipe, and the high-order expanded head under the outer pipe is repeatedly sheared by the inner pipe rammer main and sub hammer double-immersed pipe built-in hammer system to form a concave body in the expanded head;
after a concave body in the pile bottom expansion head is formed, a pile body is poured to form a pointed and bullet type expansion head anchor pile anchored into the expansion head by a set depth; or firstly placing deformable and compressible materials into the concave body of the enlarged head, and pouring the pile body to form the deformable controllable-settlement controlled pile.
6. The method of constructing a deep foundation pile with an enlarged head as set forth in claim 5, wherein: firstly, constructing a first pile, wherein the first pile is a cast-in-place pile; constructing a second pile;
the second pile construction method is one of the following methods:
A) the second pile is an external prefabricated and internal cast-in-place pile, and the construction method comprises the following steps:
(1) in-place: the outer pipe is concentrically positioned on a set first pile position;
(2) sinking the tube: sinking the outer pipe to a set depth;
(3) bottom expanding: carrying out bottom expanding construction according to a construction method of the pile bottom expanding head;
(4) no-pipe-drawing pouring molding: placing the reinforcement cage into the outer pipe, and pouring fluid concrete to form a reinforced concrete mixed pile body in the outer steel pipe;
the second pile is an inner prefabricated and outer cast-in-place pile, and the construction method comprises the following steps:
(1) in-place: the outer pipe is concentrically positioned on a set first pile position;
(2) sinking the tube: sinking the outer pipe to a set depth;
(3) bottom expanding: carrying out bottom expanding construction according to a construction method of the pile bottom expanding head;
(4) pipe drawing and pouring molding: the prefabricated pile is placed into the outer pipe, the hammer of the inner tamping pipe is propped against the prefabricated pile head, the filler is put into a cavity between the outer pipe and the prefabricated pile body, the prefabricated pile is vibrated, pressed and pulled upwards, the prefabricated pile is repeatedly vibrated, pressed and sunk and then pulled upwards, the filler fills the cavity, and the terrace pulled out of the outer pipe forms a convex, concave and convex or bamboo-like filler pile body.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011317337.7A CN112323785A (en) | 2020-11-23 | 2020-11-23 | Deep foundation pile with enlarged head and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011317337.7A CN112323785A (en) | 2020-11-23 | 2020-11-23 | Deep foundation pile with enlarged head and construction method thereof |
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| CN112323785A true CN112323785A (en) | 2021-02-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115030141A (en) * | 2022-07-21 | 2022-09-09 | 邵良荣 | Cast-in-place pile body carrier pile and construction method thereof |
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