CN107327314B - Construction method of ultra-thick backfill layer pile foundation - Google Patents
Construction method of ultra-thick backfill layer pile foundation Download PDFInfo
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- CN107327314B CN107327314B CN201710443680.8A CN201710443680A CN107327314B CN 107327314 B CN107327314 B CN 107327314B CN 201710443680 A CN201710443680 A CN 201710443680A CN 107327314 B CN107327314 B CN 107327314B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
Abstract
The invention relates to a construction method of an ultra-thick backfill layer pile foundation, which comprises the following steps: excavating a foundation pit for embedding the steel pipe pile casing on the ultra-thick backfill layer by adopting machinery, wherein the depth of the foundation pit exceeds 5 m; the backfill material contains blocky stones with the particle size larger than 500mm, and the thickness of the backfill layer is more than 11 m; filling a clay layer into the bottom of the foundation pit, and then arranging the steel pipe pile casing into the foundation pit along the vertical direction, wherein the thickness of the clay layer is more than 500 mm; exposing the top end of the backfilled steel pipe pile casing out of the ground; preparing mud by stirring clay and water, wherein the specific gravity of the mud is more than 1.35; pouring the prepared slurry into the steel pipe protective cylinder, and filling the steel pipe protective cylinder with the slurry; and hammering the backfill layer in the steel pipe protective cylinder by adopting a hammering pile, and forming holes by using the slurry protective wall. The method for constructing the pile foundation of the ultra-thick backfill layer can improve the hole forming quality of the pile foundation of the ultra-thick backfill layer, enables the hole forming of the pile foundation of the ultra-thick backfill layer to be more convenient, efficient and rapid, further can shorten the construction period and reduce the construction cost.
Description
Technical Field
The invention relates to a construction method of an ultra-thick backfill layer pile foundation.
Background
The coastal region adopts mountain-opening backfill to form a project of a land area, the backfill material contains more large-particle-size rock blocks, the field is not subjected to dynamic compaction, and the backfill layer structure is relatively loose; the formal seawall is not formed generally when the sea area is backfilled, and the sea surface tide level has obvious influence on the underground water level of the field area; because the basic level of the original sea area is low, a large amount of mountain-digging muck needs to be backfilled to form an ultra-thick backfill layer in part of projects; the problems cause a plurality of adverse effects on project construction, particularly pile foundation construction, cause problems of pile foundation hole wall collapse, overlarge hole diameter, necking, wall protection slurry loss, incapability of normally drilling a pile machine and the like, and cause irreparable harm to construction quality.
For the pile foundation construction of an ultra-thick backfill layer, the current common method mainly comprises the following steps:
1. hammering pile pore-forming
Adopting an impact hammer to form a hole, and utilizing high-specific gravity slurry to form a hole wall support so as to penetrate through a backfill layer to form a hole; the process has the advantages that: large equipment investment is not needed, the requirement on the site is low, and the vibration is small; the disadvantages are as follows: the construction period is long, and the underground water level has great influence on the forming of the retaining wall.
2. Adopting all-steel casing and hammering penetration backfill layer
The inner mold pipe is hammered through the backfill layer by the large-scale hammering pile driver in the form of the inner mold pipe and the outer mold pipe, the outer mold pipe sinks along with the outer mold pipe in the full thickness, the inner mold pipe is taken out after hole forming, and the outer mold pipe is taken out in a vibration mode after pile forming. The process has the advantages that: the steel pipe can be circulated, and the construction speed is high; the disadvantages are as follows: large-scale mechanical equipment is required for construction, and the requirement on the site is high; strong noise, large vibration and easy soil squeezing effect during construction; the cost is high.
Disclosure of Invention
The invention aims to provide the construction method of the pile foundation of the ultra-thick backfill layer, which can improve the hole forming quality of the pile foundation of the ultra-thick backfill layer, enables the hole forming of the pile foundation of the ultra-thick backfill layer to be more convenient, efficient and rapid, further shortens the construction period and reduces the construction cost.
The invention discloses a construction method of an ultra-thick backfill layer pile foundation, which comprises the following steps:
A. excavating a foundation pit for embedding the steel pipe pile casing on the ultra-thick backfill layer by adopting machinery, wherein the depth of the foundation pit exceeds 5 m;
the ultra-thick backfill layer is a field formed by digging a mountain and backfilling the ground, which is close to a sea wall, and the surface water of the field is influenced by the sea surface tide level, the field is not subjected to dynamic compaction, the backfill layer is compacted through natural sedimentation, and the internal structure is relatively loose; the backfill material contains blocky stones with the particle size larger than 500mm, and the thickness of the backfill layer is more than 11 m;
B. filling a clay layer into the bottom of the foundation pit, and then arranging the steel pipe pile casing into the foundation pit along the vertical direction, wherein the thickness of the clay layer is more than 500 mm;
C. exposing the top end of the backfilled steel pipe pile casing out of the ground;
D. preparing mud by stirring clay and water, wherein the specific gravity of the mud is more than 1.35;
E. pouring the prepared slurry into the steel pipe protective cylinder, and filling the steel pipe protective cylinder with the slurry;
F. hammering a backfill layer in the steel pipe pile casing by adopting a hammering pile, forming a hole by using a slurry protecting wall, and hammering the hole to be below an underground water level influence line;
G. adding Portland cement into the steel pipe casing filled with the slurry, fully stirring the Portland cement and the slurry to form cement slurry, standing for more than 12 hours, and continuously hammering the pile to hammer the backfill layer in the steel pipe casing until the hammering hole forms and penetrates through the ultra-thick backfill layer.
Furthermore, the penetration rate of the hammering hole forming is controlled to be 0.5-1.25m every 30 minutes, and the penetration rate is controlled to be 0.1-0.35m every 30 minutes when the hammering hole forming meets large-particle-size rock blocks;
further, the internal diameter of the steel pipe casing is 800mm, the diameter of the hammer head of the hammering pile is 600mm, the length of the hammer head is 2.7 meters, and the weight of the hammer head is 3 tons.
Further, when the hole is formed by hammering and penetrates through a ballast layer, the mud retaining wall drilling operation is carried out by using a rotary pile machine.
The construction method of the ultra-thick backfill layer pile foundation adopts the special process of the invention, so that the hole forming of the ultra-thick backfill layer pile foundation is more convenient, efficient and rapid, the construction period can be further shortened, and the construction cost can be reduced. Therefore, the construction method of the ultra-thick backfill layer pile foundation has prominent substantive characteristics and remarkable progress.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention is suitable for the situation that dynamic compaction is not carried out, the backfill layer naturally settles and is compact, and the structure is relatively loose; the backfill material contains blocky stones with the particle size larger than 500mm, and the thickness of the backfill layer is more than 11 m; the operation site is close to a seawall, and the surface water of the site is greatly influenced by sea surface tide level; the pile foundation type is drilling bored concrete pile, and the pile foundation interval is greater than 9 m.
The invention discloses a construction method of an ultra-thick backfill layer pile foundation, which comprises the following steps:
A. excavating a foundation pit for embedding the steel pipe pile casing on the ultra-thick backfill layer by adopting machinery, wherein the depth of the foundation pit exceeds 5 m;
the ultra-thick backfill layer is a field formed by digging a mountain and backfilling the ground, which is close to a sea wall, and the surface water of the field is influenced by the sea surface tide level, the field is not subjected to dynamic compaction, the backfill layer is compacted through natural sedimentation, and the internal structure is relatively loose; the backfill material contains blocky stones with the particle size larger than 500mm, and the thickness of the backfill layer is more than 11 m;
B. filling a clay layer into the bottom of the foundation pit, and then arranging the steel pipe pile casing into the foundation pit along the vertical direction, wherein the thickness of the clay layer is more than 500 mm;
C. exposing the top end of the backfilled steel pipe pile casing out of the ground;
D. preparing mud by stirring clay and water, wherein the specific gravity of the mud is more than 1.35;
E. pouring the prepared slurry into the steel pipe protective cylinder, and filling the steel pipe protective cylinder with the slurry;
F. hammering a backfill layer in the steel pipe pile casing by adopting a hammering pile, forming a hole by using a slurry protecting wall, and hammering the hole to be below an underground water level influence line;
G. adding Portland cement into the steel pipe casing filled with the slurry, fully stirring the Portland cement and the slurry to form cement slurry, standing for more than 12 hours, and continuously hammering the pile to hammer the backfill layer in the steel pipe casing until the hammering hole forms and penetrates through the ultra-thick backfill layer.
As a further improvement of the invention, the penetration rate of the hammering hole forming is controlled to be 0.5-1.25m every 30 minutes, and the penetration rate is controlled to be 0.1-0.35m every 30 minutes when meeting the large-particle-size rock block;
as a further improvement of the invention, the inner diameter of the steel pipe casing is 800mm, the diameter of the hammerhead of the hammering pile is 600mm, the length of the hammerhead is 2.7 meters, and the hammerhead weighs 3 tons.
As a further improvement of the invention, when the hammer is used for drilling holes to penetrate through the slag layer, the rotary pile machine is used for carrying out mud wall protection drilling operation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. The construction method of the ultra-thick backfill layer pile foundation is characterized by comprising the following steps:
A. excavating a foundation pit for embedding the steel pipe pile casing on the ultra-thick backfill layer by adopting machinery, wherein the depth of the foundation pit exceeds 5 m;
the ultra-thick backfill layer is a field formed by digging a mountain and backfilling the ground, which is close to a sea wall, and the surface water of the field is influenced by the sea surface tide level, the field is not subjected to dynamic compaction, the backfill layer is compacted through natural sedimentation, and the internal structure is relatively loose; the backfill material contains blocky stones with the particle size larger than 500mm, and the thickness of the backfill layer is more than 11 m;
B. filling a clay layer into the bottom of the foundation pit, and then arranging the steel pipe pile casing into the foundation pit along the vertical direction, wherein the thickness of the clay layer is more than 500 mm;
C. exposing the top end of the backfilled steel pipe pile casing out of the ground;
D. preparing mud by stirring clay and water, wherein the specific gravity of the mud is more than 1.35;
E. pouring the prepared slurry into the steel pipe protective cylinder, and filling the steel pipe protective cylinder with the slurry;
F. hammering a backfill layer in the steel pipe pile casing by adopting a hammering pile, forming a hole by using a slurry protecting wall, and hammering the hole to be below an underground water level influence line; the penetration rate of the hammering hole forming is controlled to be 0.5-1.25m every 30 minutes, and the penetration rate is controlled to be 0.1-0.35m every 30 minutes when the hammering hole forming meets the large-particle-size rock block; when the hole is formed by hammering and penetrates through a slag layer of the pond, the mud retaining wall drilling operation is carried out by using a rotary pile machine;
G. adding Portland cement into the steel pipe casing filled with the slurry, fully stirring the Portland cement and the slurry to form cement slurry, standing for more than 12 hours, and continuously hammering the pile to hammer the backfill layer in the steel pipe casing until the hammering hole forms and penetrates through the ultra-thick backfill layer.
2. The construction method of the ultra-thick backfill layer pile foundation according to the claim 1, characterized in that: the internal diameter of a steel pipe protects a section of thick bamboo is 800mm, the tup diameter of hammering stake is 600mm, and the tup is long 2.7 meters, and the tup is heavy 3 tons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710443680.8A CN107327314B (en) | 2017-06-13 | 2017-06-13 | Construction method of ultra-thick backfill layer pile foundation |
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| CN201710443680.8A CN107327314B (en) | 2017-06-13 | 2017-06-13 | Construction method of ultra-thick backfill layer pile foundation |
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| CN107327314B true CN107327314B (en) | 2020-06-05 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3672304B1 (en) * | 2004-10-28 | 2005-07-20 | 株式会社高特 | Filling method of existing buried hollow pipe and backfilling method of existing structure |
| CN101289861B (en) * | 2008-04-10 | 2010-08-11 | 中交三航局第二工程有限公司 | Pile foundation construction method for foundation ditch in water |
| CN102518130B (en) * | 2011-12-29 | 2014-12-17 | 中铁上海工程局集团华海工程有限公司 | Manufacturing method of and construction process of reinforcement cage cement plaster pile casing |
| CN104120716A (en) * | 2013-04-28 | 2014-10-29 | 杨哲 | Slurry wall protection construction method for bored pile |
| CN104818712B (en) * | 2015-04-07 | 2017-01-18 | 浙江大华建设集团有限公司 | Construction method of cast-in-situ bored pile suitable for karst cave geology |
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