CN109989415B - Construction method of fabricated foundation - Google Patents

Construction method of fabricated foundation Download PDF

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Publication number
CN109989415B
CN109989415B CN201910373037.1A CN201910373037A CN109989415B CN 109989415 B CN109989415 B CN 109989415B CN 201910373037 A CN201910373037 A CN 201910373037A CN 109989415 B CN109989415 B CN 109989415B
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China
Prior art keywords
steel pipe
pipe pile
steel
reinforced concrete
bearing platform
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CN201910373037.1A
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Chinese (zh)
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CN109989415A (en
Inventor
雷红兵
杨文超
何志强
师国良
何博奥
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Henan Lyujian Building Technology Co Ltd
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Henan Lyujian Building Technology Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/10Deep foundations
    • E02D27/12Pile foundations
    • E02D27/14Pile framings, i.e. piles assembled to form the substructure
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/38Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds

Abstract

The construction method of the fabricated foundation comprises the following steps: (1) excavating a foundation trench; (2) laying a layer of mortar at the bottom of the foundation trench; (3) hoisting and horizontally placing the prefabricated reinforced concrete bearing platform on the laid mortar; (4) the steel pipe pile downwards penetrates through mortar through a corrugated pipe and is drilled into a soil layer; (5) cleaning soil and slag in an annular cavity between the inner wall of the corrugated pipe and the outer wall of the steel pipe pile; (6) placing steel bars or steel bar cages into the steel pipe piles from the upper end ports of the steel pipe piles; (7) an anchoring steel bar is arranged in an annular cavity between the outer wall of the steel pipe pile and the inner wall of the corrugated pipe; (8) and pouring high-strength and early-strength grouting materials in the steel pipe pile and the annular cavity simultaneously. The construction method is novel in design, simple, convenient and quick in construction method, the foundation trench does not need to be tamped after the trench is dug, the construction efficiency is high, the foundation trench can be prefabricated in a factory according to the set strength of a building foundation, the construction method is small in volume and quick in solidification in site pouring, the construction progress is improved, and the construction method has extremely high safety and reliability.

Description

Construction method of fabricated foundation
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a construction method of an assembly type foundation.
Background
At present, the construction of most of building foundations adopts traditional cast-in-place concrete's mode, but cast-in-place concrete foundation's efficiency of construction is low (need level the place earlier, and drop into a large amount of manual works and mechanical equipment and carry out basic foreshadowing and bed course construction processing, and ligature configuration steel reinforcement cage, prop up and establish the template, pour concrete and wait for the solidification of concrete), in addition, cast-in-place concrete still receives the influence of weather great, for example in chilly winter, the construction quality control degree of difficulty is great, is not conform to green's development theory.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the construction method of the assembly type foundation, which has high construction efficiency and good construction quality and is not influenced by climate and regions.
In order to solve the technical problems, the invention adopts the following technical scheme: the construction method of the fabricated foundation comprises the following steps,
(1) paying off the construction site, excavating a foundation trench according to the paying off, and stopping excavating after the depth and the width of the foundation trench meet set requirements;
(2) laying a layer of mortar at the bottom of the foundation trench;
(3) hoisting and horizontally placing the prefabricated reinforced concrete bearing platform on the laid mortar; a plurality of vertically through pre-buried holes are uniformly formed in the reinforced concrete bearing platform, and corrugated pipes cast with the reinforced concrete bearing platform into a whole are arranged in the pre-buried holes;
(4) the steel pipe pile downwards penetrates through mortar through the corrugated pipe and is drilled into a soil layer, and the drilling is stopped when the upper end of the steel pipe pile is immersed into the corrugated pipe;
(5) separating the drilling machine from the upper end of the steel pipe pile, and cleaning soil and slag in an annular cavity between the inner wall of the corrugated pipe and the outer wall of the steel pipe pile;
(6) placing steel bars or steel bar cages into the steel pipe piles from the upper end ports of the steel pipe piles;
(7) an anchoring steel bar is arranged in an annular cavity between the outer wall of the steel pipe pile and the inner wall of the corrugated pipe, the anchoring steel bar penetrates through the steel pipe pile, and two ends of the riveting steel bar are in contact with the inner wall of the corrugated pipe;
(8) and simultaneously pouring high-strength and early-strength grouting materials in the steel pipe pile and the annular cavity, wherein the upper surface of the poured high-strength and early-strength grouting materials is flush with the upper surface of the reinforced concrete bearing platform.
A drill bit is fixedly arranged at the lower end of the steel pipe pile, a plurality of connecting holes are formed in one section of the corrugated pipe in the radial direction after the steel pipe pile stops drilling into a soil layer, anchoring reinforcing steel bars penetrate through the connecting holes, and a plurality of layers of anchoring reinforcing steel bars are arranged in a staggered mode in the vertical direction; and spiral ribs are arranged on the outer circumference of the steel pipe pile below the connecting holes.
Each connecting hole is a long hole structure which is arranged along the bus direction of the steel pipe pile, the lower end of one connecting hole which is opposite to the center line of the steel pipe pile corresponds to and penetrates through the upper end of the other connecting hole along the radial direction of the steel pipe pile, and the anchoring reinforcing steel bar penetrates through one connecting hole at the upper part and then penetrates out of one connecting hole at the lower part and then is horizontally arranged along the radial direction of the steel pipe pile.
And (4) the concrete process that the steel pipe pile downwards penetrates through mortar through the corrugated pipe and then is drilled into the soil layer in the step (4) is that a drill bit at the lower end extends into the corrugated pipe, the upper end of the steel pipe pile is connected to a drilling machine, the drilling machine is started to drive the steel pipe pile to rotate, the drill bit firstly drills the mortar downwards and then continues to drill downwards into the stratum, and drilled soil slag is discharged upwards through the corrugated pipe.
The upper surface of the reinforced concrete bearing platform is provided with an embedded steel plate, the embedded steel plate is embedded in the reinforced concrete bearing platform through foundation bolts, and the upper surface of the embedded steel plate is flush with the upper surface of the reinforced concrete bearing platform; and (5) after the step (8) is finished, placing a center line on the surface of the reinforced concrete bearing platform, and installing or welding a steel column on the embedded steel plate.
By adopting the technical scheme, the reinforced concrete bearing platform (comprising the corrugated pipe and the embedded steel plate) is prefabricated in a factory, the thickness, the length and the width of the reinforced concrete bearing platform are determined according to the size designed in the construction of the building engineering, and the drill bit is welded at the lower end of the steel pipe pile.
The corrugated pipe is arranged in the reinforced concrete bearing platform, and when the high-strength early-strength grouting material is poured, the corrugated pipe, the anchoring reinforcing steel bars and the steel pipe pile are solidified into a whole, so that the reinforced concrete bearing platform is well supported.
Because of the limitation of the annular cavity, the anchoring steel bar cannot be directly and horizontally penetrated. When the anchoring reinforcing steel bars are arranged in a penetrating mode, the anchoring reinforcing steel bars stretch into one connecting hole in an inclined mode, penetrate out of the corresponding lower connecting hole, and are finally placed horizontally, and the anchoring reinforcing steel bars can be placed in an inclined mode. The long hole structure of the connecting hole and the two radially opposite connecting holes are arranged up and down and are provided with horizontally corresponding through parts, so that the anchoring reinforcing steel bars can be conveniently penetrated and can be horizontally placed.
In conclusion, the construction method is novel in design, simple, convenient and quick, the foundation trench does not need to be tamped after the trench is dug, the construction operation is convenient, the construction efficiency is high, the foundation trench can be prefabricated in a factory according to the set strength of the building foundation, the cast-in-place volume is small, the solidification is fast, the construction progress is greatly improved, and the construction method has extremely high safety and reliability.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a top view of the present invention
Fig. 3 is a schematic view of the steel pipe pile after the anchor bars are inserted into the connecting holes.
Detailed Description
As shown in fig. 1, 2 and 3, the construction method of the fabricated foundation of the present invention includes the steps of:
(1) paying off the construction site, excavating a foundation trench according to the paying off, and stopping excavating after the depth and the width of the foundation trench meet set requirements;
(2) laying a layer of mortar at the bottom of the foundation trench;
(3) hoisting and horizontally placing the prefabricated reinforced concrete bearing platform 1 on the laid mortar; a plurality of vertically through pre-buried holes 2 are uniformly formed in the reinforced concrete bearing platform 1, and corrugated pipes 3 cast with the reinforced concrete bearing platform 1 into a whole are arranged in the pre-buried holes 2;
(4) the steel pipe pile 4 downwards penetrates through mortar through the corrugated pipe 3 and is drilled into a soil layer, and the drilling is stopped when the upper end of the steel pipe pile 4 is immersed into the corrugated pipe 3;
(5) separating the drilling machine from the upper end of the steel pipe pile 4, and cleaning soil and slag in an annular cavity between the inner wall of the corrugated pipe 3 and the outer wall of the steel pipe pile 4;
(6) placing steel bars or steel reinforcement cages into the steel pipe piles 4 from the upper ports of the steel pipe piles 4;
(7) an anchoring steel bar 7 is arranged in an annular cavity between the outer wall of the steel pipe pile 4 and the inner wall of the corrugated pipe 3, the anchoring steel bar 7 penetrates through the steel pipe column, and two ends of a riveting steel bar are in contact with the inner wall of the corrugated pipe 3;
(8) and (3) pouring high-strength and early-strength grouting materials in the steel pipe pile 4 and the annular cavity at the same time, wherein the upper surface of the poured high-strength and early-strength grouting materials is flush with the upper surface of the reinforced concrete bearing platform 1.
A drill bit 5 is fixedly arranged at the lower end of the steel pipe pile 4, a plurality of connecting holes 6 are formed in one section of the corrugated pipe 3 along the radial direction after the steel pipe pile 4 stops drilling into a soil layer, anchoring reinforcing steel bars 7 penetrate through the connecting holes 6, and the anchoring reinforcing steel bars 7 are arranged in a plurality of layers in a staggered mode along the vertical direction; the outer circumference of the steel pipe pile 4 is provided with a spiral rib 8 below the connection hole 6. The spiral ribs 8 play a role in enhancing the bonding strength of the steel pipe pile 4 and the soil layer, and are convenient for turning soil slag upwards in the drilling process.
Each connecting hole 6 is a long hole structure which is arranged along the bus direction of the steel pipe pile 4, the lower end of one connecting hole 6 opposite to the central line of the steel pipe pile 4 and the upper end of the other connecting hole 6 are correspondingly penetrated along the radial direction of the steel pipe pile 4, and the anchoring reinforcing steel bar 7 penetrates through one connecting hole 6 on the upper part and then penetrates out of one connecting hole 6 on the lower part to be horizontally arranged along the radial direction of the steel pipe pile 4.
And (4) the concrete process that the steel pipe pile 4 downwards penetrates through mortar through the corrugated pipe 3 and then is drilled into the soil layer is that the drill bit 5 at the lower end firstly extends into the corrugated pipe 3, then the upper end of the steel pipe pile 4 is connected to a drilling machine, the drilling machine is started, the steel pipe pile 4 is driven to rotate, the drill bit 5 firstly drills through the mortar downwards and then continuously drills downwards into the ground layer, and drilled soil slag is discharged upwards through the corrugated pipe 3.
The upper surface of the reinforced concrete bearing platform 1 is provided with an embedded steel plate 9, the embedded steel plate 9 is embedded in the reinforced concrete bearing platform 1 through foundation bolts, and the upper surface of the embedded steel plate 9 is flush with the upper surface of the reinforced concrete bearing platform 1; after the step (8) is finished, a central line is placed on the surface of the reinforced concrete bearing platform 1, and steel columns are installed or welded on the embedded steel plates 9.
The reinforced concrete bearing platform 1 (comprising the corrugated pipe 3 and the embedded steel plate 9) is prefabricated in a factory, the thickness, the length and the width of the reinforced concrete bearing platform 1 are determined according to the size designed in the construction of constructional engineering, and the drill bit 5 is welded at the lower end of the steel pipe pile 4.
According to the invention, the corrugated pipe 3 is arranged in the reinforced concrete bearing platform 1, and when a high-strength and early-strength grouting material is poured, the corrugated pipe 3, the anchoring steel bar 7 and the steel pipe pile 4 are solidified into a whole, so that the reinforced concrete bearing platform 1 is well supported.
Due to the annular cavity limitation, the anchoring bars 7 cannot be directly and horizontally penetrated. When the anchoring steel bars 7 are arranged in a penetrating mode, the anchoring steel bars 7 extend into one connecting hole 6 in an inclined mode, penetrate out of the corresponding lower connecting hole 6, and are finally placed horizontally, and the anchoring steel bars can be placed in an inclined mode. The long hole structure of the connecting hole 6 and the two connecting holes 6 which are opposite in the radial direction are arranged up and down and are provided with horizontally corresponding through parts, so that the anchoring steel bar 7 can be conveniently penetrated and the anchoring steel bar 7 can be horizontally placed.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims (3)

1. The construction method of the fabricated foundation is characterized in that: comprises the following steps of (a) carrying out,
(1) paying off the construction site, excavating a foundation trench according to the paying off, and stopping excavating after the depth and the width of the foundation trench meet set requirements;
(2) laying a layer of mortar at the bottom of the foundation trench;
(3) hoisting and horizontally placing the prefabricated reinforced concrete bearing platform on the laid mortar; a plurality of vertically through pre-buried holes are uniformly formed in the reinforced concrete bearing platform, and corrugated pipes cast with the reinforced concrete bearing platform into a whole are arranged in the pre-buried holes;
(4) the steel pipe pile downwards penetrates through mortar through the corrugated pipe and is drilled into a soil layer, and the drilling is stopped when the upper end of the steel pipe pile is immersed into the corrugated pipe;
(5) separating the drilling machine from the upper end of the steel pipe pile, and cleaning soil and slag in an annular cavity between the inner wall of the corrugated pipe and the outer wall of the steel pipe pile;
(6) placing steel bars or steel bar cages into the steel pipe piles from the upper end ports of the steel pipe piles;
(7) an anchoring steel bar is arranged in an annular cavity between the outer wall of the steel pipe pile and the inner wall of the corrugated pipe, the anchoring steel bar penetrates through the steel pipe pile, and two ends of the riveting steel bar are in contact with the inner wall of the corrugated pipe;
(8) pouring high-strength and early-strength grouting materials in the steel pipe pile and the annular cavity at the same time, wherein the upper surface of the poured high-strength and early-strength grouting materials is flush with the upper surface of the reinforced concrete bearing platform;
a drill bit is fixedly arranged at the lower end of the steel pipe pile, a plurality of connecting holes are formed in one section of the corrugated pipe in the radial direction after the steel pipe pile stops drilling into a soil layer, anchoring reinforcing steel bars penetrate through the connecting holes, and a plurality of layers of anchoring reinforcing steel bars are arranged in a staggered mode in the vertical direction; spiral ribs are arranged on the outer circumference of the steel pipe pile below the connecting holes;
each connecting hole is a long hole structure which is arranged along the bus direction of the steel pipe pile, the lower end of one connecting hole which is opposite to the center line of the steel pipe pile corresponds to and penetrates through the upper end of the other connecting hole along the radial direction of the steel pipe pile, and the anchoring reinforcing steel bar penetrates through one connecting hole at the upper part and then penetrates out of one connecting hole at the lower part and then is horizontally arranged along the radial direction of the steel pipe pile.
2. The construction method of the fabricated foundation according to claim 1, wherein: and (4) the concrete process that the steel pipe pile downwards penetrates through mortar through the corrugated pipe and then is drilled into the soil layer in the step (4) is that a drill bit at the lower end extends into the corrugated pipe, the upper end of the steel pipe pile is connected to a drilling machine, the drilling machine is started to drive the steel pipe pile to rotate, the drill bit firstly drills the mortar downwards and then continues to drill downwards into the stratum, and drilled soil slag is discharged upwards through the corrugated pipe.
3. The construction method of the fabricated foundation according to claim 1, wherein: the upper surface of the reinforced concrete bearing platform is provided with an embedded steel plate, the embedded steel plate is embedded in the reinforced concrete bearing platform through foundation bolts, and the upper surface of the embedded steel plate is flush with the upper surface of the reinforced concrete bearing platform; and (5) after the step (8) is finished, placing a center line on the surface of the reinforced concrete bearing platform, and installing or welding a steel column on the embedded steel plate.
CN201910373037.1A 2019-05-06 2019-05-06 Construction method of fabricated foundation Active CN109989415B (en)

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Application Number Priority Date Filing Date Title
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CN109989415B true CN109989415B (en) 2021-05-28

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Publication number Priority date Publication date Assignee Title
CN111364490A (en) * 2020-03-25 2020-07-03 上海勘测设计研究院有限公司 High pile cap foundation based on driven and rotated piles and construction method thereof

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CN108331008A (en) * 2018-04-04 2018-07-27 上海勘测设计研究院有限公司 Offshore wind turbine foundation structure and its construction method
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Publication number Priority date Publication date Assignee Title
JP2009102818A (en) * 2007-10-22 2009-05-14 Takenaka Komuten Co Ltd Connection structure between pillar and steel pipe pile
CN202500148U (en) * 2011-12-13 2012-10-24 河南省电力勘测设计院 Pre-stress lightweight concrete bearing platform
CN104420486A (en) * 2013-08-21 2015-03-18 贵阳铝镁设计研究院有限公司 Method and structure for adding steel pipe pile at bottom of extended shallow foundation
CN105970993A (en) * 2016-06-30 2016-09-28 上海勘测设计研究院有限公司 Underwater connection structure for precast piles and precast bearing platform, and construction method thereof
CN107090844A (en) * 2017-05-19 2017-08-25 中交第三航务工程局有限公司 Offshore wind farm grouped piles cap composite foundation and construction method
CN108331008A (en) * 2018-04-04 2018-07-27 上海勘测设计研究院有限公司 Offshore wind turbine foundation structure and its construction method
CN109403366A (en) * 2018-12-13 2019-03-01 福州大学 A kind of assembly concrete-filled steel tube pile foundation and its construction method

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