CN110644467A - Construction method of building pile foundation - Google Patents
Construction method of building pile foundation Download PDFInfo
- Publication number
- CN110644467A CN110644467A CN201910830658.8A CN201910830658A CN110644467A CN 110644467 A CN110644467 A CN 110644467A CN 201910830658 A CN201910830658 A CN 201910830658A CN 110644467 A CN110644467 A CN 110644467A
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- Prior art keywords
- pile foundation
- soil
- hole
- construction
- drilling machine
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
- E02D3/123—Consolidating by placing solidifying or pore-filling substances in the soil and compacting the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- 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
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
Abstract
The invention discloses a construction method of a building pile foundation, which comprises the following steps: cleaning a construction site; placing a sample in a coordinate mode, and drawing a reinforced foundation ring; digging soft soil, mixing with soil curing agent, and backfilling and tamping again; pre-burying a protective cylinder; laying a drilling operation rack for supporting a drilling machine; sampling and analyzing the soil samples of all marked pile foundation coordinate points, and reasonably selecting the pore-forming sequence of the impact drilling machine and the rotary drilling machine according to geological characteristics; carrying out interval hole expansion; hoisting a reinforcement cage; pouring concrete; post-curing the formed pile foundation; according to the method, the soil around the coordinate points of the pile foundation is dug and mixed with the soil curing agent, and then layered backfilling and tamping are carried out again, so that the strength of the soil around the pile foundation can be effectively improved, the problem of pile foundation sinking caused by poor soil quality stability can be avoided, the stability and the bearing capacity of pile foundation construction can be improved, and the hole forming quality of the pile foundation can be effectively ensured by reasonably selecting the hole forming sequence according to geological characteristics.
Description
Technical Field
The invention relates to the field of building engineering, in particular to a construction method of a building pile foundation.
Background
With the development of civil engineering and construction technology, pile foundations are adopted more and more, and the development trend is towards super-long and large-diameter pile foundations; the pile foundation is composed of a foundation pile and a bearing platform connected with the pile top, if the pile body is completely buried in the soil, the bottom surface of the bearing platform is contacted with the soil body, the pile foundation is called a low bearing platform pile foundation, if the upper part of the pile body is exposed out of the ground and the bottom of the bearing platform is positioned above the ground, the pile foundation becomes a high bearing platform pile foundation, the building pile foundation is usually a low bearing platform pile foundation, and the application of the pile foundation is wide in high-rise buildings.
The existing construction pile foundation installation and construction modes can be divided into precast piles and cast-in-place piles, the precast piles drive prefabricated reinforced concrete piles into addresses through pile drivers, and the prefabricated pile foundation installation and construction method is suitable for buildings with higher requirements; the cast-in-place pile is drilled in a construction site, and after the required depth is reached, the steel bar is placed into the cast-in-place concrete for fixing and forming, so that the cast-in-place pile has the advantages of low construction difficulty, no limitation of the number of machines, simultaneous construction of all the piles and great time saving, but the cast-in-place pile has the defect of low bearing capacity, and the pile foundation is easy to crack in the construction process, thereby easily causing rework and resource and manpower consumption.
Disclosure of Invention
In order to solve the problems, the invention provides the construction method of the building pile foundation, which is characterized in that the soil around the coordinate point of the pile foundation is dug and mixed with the soil curing agent, and then the mixture is backfilled and tamped layer by layer again, so that the strength of the soil around the pile foundation can be effectively improved, the problem of pile foundation sinking caused by poor soil quality stability can be avoided, and the stability and the bearing capacity of pile foundation construction can be improved.
The invention provides a construction method of a building pile foundation, which comprises the following steps:
the method comprises the following steps: cleaning a construction site, removing impurities, measuring levelness of the site, and ensuring that the construction site is flat and needs to be dry;
step two: performing coordinate lofting by using a total station, determining a pile foundation coordinate point, marking by using a timber pile and an iron standard, additionally arranging a fender pile, and drawing a circle by taking the marked pile foundation coordinate point as the center of the circle, wherein the circle is marked as a reinforced foundation ring;
step three: digging soil outside the coordinate points of the pile foundation and inside the reinforced foundation ring, digging soft soil in the range, mixing the soft soil with a soil curing agent, backfilling again, and shaping and tamping by using rolling equipment;
step four: pre-burying a pile casing at a pile foundation coordinate point, and filling clay or gravel soil around the pile casing;
step five: according to the position of a pile foundation coordinate point on a building pile foundation construction plane and a drilling sequence, a drilling operation rack for supporting a drilling machine is laid on the building pile foundation construction plane;
step six: sampling and analyzing soil samples of all marked pile foundation coordinate points, analyzing the geological characteristics of the pile foundation coordinate points, adopting a percussion drill and a rotary drilling machine to form holes, and reasonably selecting the hole forming sequence of the percussion drill and the rotary drilling machine according to the geological characteristics;
step seven: after the hole forming construction is finished, replacing a hole expanding drill bit, expanding holes from top to bottom at intervals, stopping the hole expanding drill bit after bottom hole expansion, lifting the hole expanding drill bit for a certain distance, expanding the holes, and repeating the operation until the hole expansion reaches the top end of the formed hole;
step eight: the pre-bundled reinforcement cage is aligned with a pile foundation hole and quickly lowered to enable the reinforcement cage to be concentric with the pile foundation hole, then the reinforcement cage is vibrated to a position by a high-power vibration hammer, and the top elevation of the reinforcement cage is accurately controlled and then fixed;
step nine: pouring concrete, namely pouring the concrete into the pile foundation hole by adopting a conduit method until the concrete overflows the pile foundation hole, and forming a pile foundation after curing;
step ten: and performing post-curing on the formed pile foundation for 5-7 days.
The further improvement lies in that: when the construction site is cleaned in the first step, the broken stone blocks on the construction site do not need to be cleaned, are crushed by using crushing equipment, and are tamped in situ.
The further improvement lies in that: and controlling the radius of the circle drawn in the second step to be 1/2 pile foundation side length +50 cm.
The further improvement lies in that: and in the third step, when the soft soil and the soil curing agent are mixed and then backfilled, the backfilling is carried out in layers, and each backfilling layer is subjected to shaping and tamping once.
The further improvement lies in that: and in the third step, the backfilled soft soil needs to be maintained after shaping and tamping, and the backfilled soft soil is sprayed with water, rolled and tamped every 8 to 10 hours and repeatedly processed for 2 to 4 times.
The further improvement lies in that: when the protective barrel is pre-embedded in the fourth step, the pre-embedding depth of the protective barrel is 1-1.5 meters and the height of the protective barrel needs to be 30-40 centimeters higher than the ground.
The further improvement lies in that: and sixthly, when the impact drilling machine and the rotary drilling machine are combined to form the hole, the drilling machine is ensured to be horizontal and stable, and then the leveling instrument is used for measuring the level at the four opposite angular points to ensure that the drill rod is vertical.
The further improvement lies in that: and when concrete is poured in the ninth step, the pouring process needs to be controlled continuously.
The further improvement lies in that: the concrete operation of performing post-maintenance on the molded pile foundation in the step ten is as follows: and (4) sprinkling water to the pile foundation for infiltration, and then carrying out heat preservation on the part of the pile foundation protruding out of the ground by using a spreading film.
The invention has the beneficial effects that: according to the method, the soil around the coordinate points of the pile foundation is dug and mixed with the soil curing agent, and then the soil is backfilled and tamped layer by layer again, so that the strength of the soil around the pile foundation can be effectively improved, the problem of pile foundation sinking caused by poor soil quality stability can be avoided, the stability and the bearing capacity of pile foundation construction can be improved, the hole forming quality of the pile foundation can be effectively ensured by reasonably selecting the hole forming sequence of the impact drilling machine and the rotary drilling machine according to geological characteristics, the subsequent procedures can be stably carried out, and the high verticality precision of the constructed pile foundation can be ensured.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
The construction method of the building pile foundation is characterized by comprising the following steps:
the method comprises the following steps: cleaning a construction site to remove impurities, crushing stones on the construction site do not need to be removed, crushing the crushed stones by using crushing equipment, tamping the crushed stones on the site, measuring levelness of the site, and ensuring that the construction site is flat and dry;
step two: performing coordinate lofting by using a total station, determining a pile foundation coordinate point, marking by using a timber pile and an iron standard, additionally arranging a fender pile, drawing a circle by taking the marked pile foundation coordinate point as the center of the circle, controlling the radius of the circle to be 1/2 pile foundation side length +50 cm, and marking as a reinforced foundation ring;
step three: digging soil outside a coordinate point of a pile foundation and inside a reinforced foundation ring, digging soft soil in the range, mixing the soft soil with a soil curing agent, and backfilling again, wherein during backfilling, the backfilling is carried out in layers, each backfilling layer is subjected to shaping tamping and is subjected to shaping tamping by utilizing rolling equipment, the maintenance is carried out after the soft soil is shaped and tamped, and the watering, rolling and tamping are carried out on the backfilled soft soil every 9 hours for 3 times;
step four: pre-burying a pile casing at a pile foundation coordinate point, wherein the pre-buried depth of the pile casing is 1.3 m and is required to be 35 cm higher than the ground when the pile casing is pre-buried, and the periphery of the pile casing is filled with gravel soil;
step five: according to the position of a pile foundation coordinate point on a building pile foundation construction plane and a drilling sequence, a drilling operation rack for supporting a drilling machine is laid on the building pile foundation construction plane;
step six: sampling and analyzing soil samples of all marked pile foundation coordinate points, analyzing the geological characteristics of the pile foundation coordinate points, adopting a percussion drill and a rotary drilling machine to jointly form holes, ensuring that the drilling machine is horizontal and stable during hole forming, then measuring the levels at four diagonal points by using a level gauge to ensure that a drill rod is vertical, and then reasonably selecting the hole forming sequence of the percussion drill and the rotary drilling machine according to the geological characteristics;
step seven: after the hole forming construction is finished, replacing a hole expanding drill bit, expanding holes from top to bottom at intervals, stopping the hole expanding drill bit after bottom hole expansion, lifting the hole expanding drill bit for a certain distance, expanding the holes, and repeating the operation until the hole expansion reaches the top end of the formed hole;
step eight: the pre-bundled reinforcement cage is aligned with a pile foundation hole and quickly lowered to enable the reinforcement cage to be concentric with the pile foundation hole, then the reinforcement cage is vibrated to a position by a high-power vibration hammer, and the top elevation of the reinforcement cage is accurately controlled and then fixed;
step nine: pouring concrete, namely pouring the concrete into the pile foundation hole by adopting a conduit method, wherein when the concrete is poured, the pouring process needs to be controlled continuously until the concrete overflows the pile foundation hole, and the pile foundation is formed after the concrete is cured;
step ten: and post-curing the formed pile foundation for 6 days, wherein the post-curing operation comprises the following specific steps: and (4) sprinkling water to the pile foundation for infiltration, and then carrying out heat preservation on the part of the pile foundation protruding out of the ground by using a spreading film.
According to the method, the soil around the coordinate points of the pile foundation is dug and mixed with the soil curing agent, and then the soil is backfilled and tamped layer by layer again, so that the strength of the soil around the pile foundation can be effectively improved, the problem of pile foundation sinking caused by poor soil quality stability can be avoided, the stability and the bearing capacity of pile foundation construction can be improved, the hole forming quality of the pile foundation can be effectively ensured by reasonably selecting the hole forming sequence of the impact drilling machine and the rotary drilling machine according to geological characteristics, the subsequent procedures can be stably carried out, and the high verticality precision of the constructed pile foundation can be ensured.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The construction method of the building pile foundation is characterized by comprising the following steps:
the method comprises the following steps: cleaning a construction site, removing impurities, measuring levelness of the site, and ensuring that the construction site is flat and needs to be dry;
step two: performing coordinate lofting by using a total station, determining a pile foundation coordinate point, marking by using a timber pile and an iron standard, additionally arranging a fender pile, and drawing a circle by taking the marked pile foundation coordinate point as the center of the circle, wherein the circle is marked as a reinforced foundation ring;
step three: digging soil outside the coordinate points of the pile foundation and inside the reinforced foundation ring, digging soft soil in the range, mixing the soft soil with a soil curing agent, backfilling again, and shaping and tamping by using rolling equipment;
step four: pre-burying a pile casing at a pile foundation coordinate point, and filling clay or gravel soil around the pile casing;
step five: according to the position of a pile foundation coordinate point on a building pile foundation construction plane and a drilling sequence, a drilling operation rack for supporting a drilling machine is laid on the building pile foundation construction plane;
step six: sampling and analyzing soil samples of all marked pile foundation coordinate points, analyzing the geological characteristics of the pile foundation coordinate points, adopting a percussion drill and a rotary drilling machine to form holes, and reasonably selecting the hole forming sequence of the percussion drill and the rotary drilling machine according to the geological characteristics;
step seven: after the hole forming construction is finished, replacing a hole expanding drill bit, expanding holes from top to bottom at intervals, stopping the hole expanding drill bit after bottom hole expansion, lifting the hole expanding drill bit for a certain distance, expanding the holes, and repeating the operation until the hole expansion reaches the top end of the formed hole;
step eight: the pre-bundled reinforcement cage is aligned with a pile foundation hole and quickly lowered to enable the reinforcement cage to be concentric with the pile foundation hole, then the reinforcement cage is vibrated to a position by a high-power vibration hammer, and the top elevation of the reinforcement cage is accurately controlled and then fixed;
step nine: pouring concrete, namely pouring the concrete into the pile foundation hole by adopting a conduit method until the concrete overflows the pile foundation hole, and forming a pile foundation after curing;
step ten: and performing post-curing on the formed pile foundation for 5-7 days.
2. The construction method of a building pile foundation according to claim 1, wherein: when the construction site is cleaned in the first step, the broken stone blocks on the construction site do not need to be cleaned, are crushed by using crushing equipment, and are tamped in situ.
3. The construction method of a building pile foundation according to claim 1, wherein: and controlling the radius of the circle drawn in the second step to be 1/2 pile foundation side length +50 cm.
4. The construction method of a building pile foundation according to claim 1, wherein: and in the third step, when the soft soil and the soil curing agent are mixed and then backfilled, the backfilling is carried out in layers, and each backfilling layer is subjected to shaping and tamping once.
5. The construction method of a building pile foundation according to claim 1, wherein: and in the third step, the backfilled soft soil needs to be maintained after shaping and tamping, and the backfilled soft soil is sprayed with water, rolled and tamped every 8 to 10 hours and repeatedly processed for 2 to 4 times.
6. The construction method of a building pile foundation according to claim 1, wherein: when the protective barrel is pre-embedded in the fourth step, the pre-embedding depth of the protective barrel is 1-1.5 meters and the height of the protective barrel needs to be 30-40 centimeters higher than the ground.
7. The construction method of a building pile foundation according to claim 1, wherein: and sixthly, when the impact drilling machine and the rotary drilling machine are combined to form the hole, the drilling machine is ensured to be horizontal and stable, and then the leveling instrument is used for measuring the level at the four opposite angular points to ensure that the drill rod is vertical.
8. The construction method of a building pile foundation according to claim 1, wherein: and when concrete is poured in the ninth step, the pouring process needs to be controlled continuously.
9. The construction method of a building pile foundation according to claim 1, wherein: the concrete operation of performing post-maintenance on the molded pile foundation in the step ten is as follows: and (4) sprinkling water to the pile foundation for infiltration, and then carrying out heat preservation on the part of the pile foundation protruding out of the ground by using a spreading film.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910830658.8A CN110644467A (en) | 2019-09-04 | 2019-09-04 | Construction method of building pile foundation |
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| CN201910830658.8A CN110644467A (en) | 2019-09-04 | 2019-09-04 | Construction method of building pile foundation |
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| CN110644467A true CN110644467A (en) | 2020-01-03 |
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Citations (4)
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|---|---|---|---|---|
| JP5040699B2 (en) * | 2008-02-12 | 2012-10-03 | Ｊｆｅスチール株式会社 | Synthetic friction pile |
| CN108978698A (en) * | 2018-07-18 | 2018-12-11 | 中建七局第建筑有限公司 | A kind of building pile foundation construction method |
| CN109339030A (en) * | 2018-10-17 | 2019-02-15 | 江苏省建筑设计研究院有限公司 | A kind of ground setting method of skyscraper |
| CN109469052A (en) * | 2018-09-13 | 2019-03-15 | 深圳市蛇口招商港湾工程有限公司 | A kind of miscellaneous fill and muddy terrain pile base construction method |
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2019
- 2019-09-04 CN CN201910830658.8A patent/CN110644467A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5040699B2 (en) * | 2008-02-12 | 2012-10-03 | Ｊｆｅスチール株式会社 | Synthetic friction pile |
| CN108978698A (en) * | 2018-07-18 | 2018-12-11 | 中建七局第建筑有限公司 | A kind of building pile foundation construction method |
| CN109469052A (en) * | 2018-09-13 | 2019-03-15 | 深圳市蛇口招商港湾工程有限公司 | A kind of miscellaneous fill and muddy terrain pile base construction method |
| CN109339030A (en) * | 2018-10-17 | 2019-02-15 | 江苏省建筑设计研究院有限公司 | A kind of ground setting method of skyscraper |
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|---|
| 丁红岩: "《土木工程施工 上》", 28 February 2015, 天津大学出版社 * |
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Application publication date: 20200103 |
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