CN112359815A - Dry-type vibroflotation gravel pile for soft foundation treatment and construction method thereof - Google Patents
Dry-type vibroflotation gravel pile for soft foundation treatment and construction method thereof Download PDFInfo
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- CN112359815A CN112359815A CN202011221860.XA CN202011221860A CN112359815A CN 112359815 A CN112359815 A CN 112359815A CN 202011221860 A CN202011221860 A CN 202011221860A CN 112359815 A CN112359815 A CN 112359815A
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- pile
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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
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D11/00—Methods or apparatus specially adapted for both placing and removing sheet pile bulkheads, piles, or mould-pipes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/18—Placing by vibrating
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- Life Sciences & Earth Sciences (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to the technical field of foundation treatment, in particular to a dry vibroflotation gravel pile for soft foundation treatment and a construction method thereof, which have good bearing capacity, avoid foundation settlement and are beneficial to environmental protection; the gravel pile is composed of a sand bag group and a gravel column, the construction method comprises the steps of manufacturing the sand bag group, arranging a sinking pipe, putting the sand bag group down, forming a squeezing hole, filling the gravel column in a segmented mode, forming a gravel column pile body and laying a cushion layer on the pile top, wherein the sand bag group is arranged on the periphery of the gravel column, the sand bag group and the sinking pipe are driven into a soft foundation by adopting the construction process of a bagged sand well, then a squeezing steel pipe is inserted into the middle position of the sand bag group, the squeezing steel pipe is spirally pulled out after the squeezing steel pipe is inserted, then a vibroflot is placed into the formed squeezing hole without carrying out high-pressure water jet impact operation, gravel is poured into the squeezing hole, the vibroflot is started, finally the gravel column is vibrated in a segmented mode, and the gravel cushion layer is arranged on the pile top.
Description
Technical Field
The invention relates to the technical field of foundation treatment, in particular to a dry vibroflotation gravel pile for soft foundation treatment and a construction method thereof.
Background
The vibro-replacement stone-breaking pile is characterized in that a pile body consisting of stones is manufactured in a foundation by utilizing a construction process of a vibro-replacement method, and the pile body and original foundation soil jointly form a composite foundation so as to improve the bearing capacity of the foundation; the method is simple, convenient and quick in construction, and is an economical and reasonable technology for reinforcing loose and soft soil; however, the broken stones are directly contacted with the soft soil to generate shearing damage, so that the foundation settlement is caused, and the method wastes water resources by adopting a high-pressure water flushing method, forms a large amount of waste slurry, and is not beneficial to environmental protection.
At present, much research is carried out at home and abroad on how to make full use of and treat the soft foundation better for improving the strength of the soft foundation. The prior patent CN91215299.0 discloses a sand shell gravel pile, which is characterized in that a sand well is formed by using a immersed tube construction method, gravel is filled in the sand well to form a gravel core by using the immersed tube construction method, and the gravel of the gravel core is not in direct contact with a soil body, so that shearing damage is prevented; although the sand well and the gravel pile are combined to be applied, the common sand well is extruded through the steel sleeve to form the sand protective shell, good wrapping force cannot be provided for the gravel pile, and the gravel core is not compacted through vibration, so that the bearing capacity is limited, and the problems of foundation settlement and the like easily occur. Patent CN201410216197.2 provides a pilot hole implantation sack rubble slip casting pile and construction method, adopts the pilot hole implantation method, solves pile body necking down, bulging, hole collapse, mud pollution scheduling problem, improves the wholeness of structure, bearing capacity, reduces the settlement of pile body, accelerates to improve foundation bearing capacity, improves pile-forming quality. However, the prior art does not directly discuss and solve the problems that water resources are wasted to form a large amount of waste slurry in the manufacturing and construction process of the vibroflotation gravel pile, and the phenomena that the gravel is directly contacted with soft soil to generate shearing damage, cause foundation settlement and the like.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the dry-type vibroflotation gravel pile for soft foundation treatment and the construction method thereof, wherein the dry-type vibroflotation gravel pile has good bearing capacity, avoids foundation settlement and is beneficial to environmental protection.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a dry-type vibroflotation gravel pile for soft foundation treatment and a construction method thereof comprise the following steps:
1) sewing bag loops on each sand bag at certain intervals, filling the sand bags with air-dried sand to be full and compact, tightening bag openings, connecting one ends of a plurality of sand bags together according to the requirement of pile forming without interruption and twisting, and then binding the sand bags together by adopting hemp ropes through the bag loops at certain intervals to prepare sand bag groups;
2) determining the position of a pile through measurement and setting-out, positioning machines such as a pile driver and the like, adopting a sinking pipe with a valve pile tip, arranging the pile tip, and then driving the pile tip into the sinking pipe to a designed depth by adopting a vibration method;
3) hoisting the whole sand bag group, putting the end parts connected together into a sinking pipe opening, pulling the tail of the bag to pass through a roller at the inlet of the sinking pipe, stably and quickly feeding the sand bag group into the sinking pipe, and controlling the sand bag group to be slowly lowered to the bottom of the sinking pipe;
4) when the immersed tube is pulled up, the micro-vibrator is started firstly, then the immersed tube is lifted, and the immersed tube is continuously and slowly pulled up until the immersed tube is completely pulled out, and the sand bag group is left in the soft foundation;
5) preparing an extrusion-expansion steel pipe, lubricating the outer side of the extrusion-expansion steel pipe, inserting the extrusion-expansion steel pipe to the bottom end of a sand bag group at the center of the formed sand bag group after lubrication, then slowly and spirally pulling up the extrusion-expansion steel pipe, and finally forming an extrusion-expansion hole;
6) putting broken stones into the squeezed holes, controlling the height of the broken stones to be about 0.5-1.0 m by putting the broken stones once, manufacturing broken stone columns in sections, lifting a vibroflot by a crane to align the squeezed holes of the pile positions, then putting the vibroflot into the vibroflot, starting dry vibroflot/waterless vibration broken stones, and setting the vibration retention time;
7) compacting the vibroflot after filling, closing the vibroflot, lifting the vibroflot out of the orifice, and repeating the step 6) until the full-length gravel column is formed;
8) after the vibration compaction reinforcement is completed, soil on the top surface of the pile is shoveled, the ground is leveled, a 30cm gravel cushion layer is paved and compacted, a sand bag group higher than the cushion layer is cut off, the bag opening is tied firmly again, the sand bag group exposed out of the ground is buried into the gravel cushion layer, the buried length is larger than 30cm or meets the design requirement, and finally the pile manufacturing process of the dry vibration-washed gravel pile for soft foundation treatment is completed.
Further, the extruded and expanded steel pipe in the step 5) is a hollow equal-diameter steel pipe.
Further, the bottom of the extruded and expanded steel pipe in the step 5) is in a closed hemispherical shape.
Further, the outer diameter of the extruded and expanded steel pipe in the step 5) is larger than that of the vibroflot.
(III) advantageous effects
Compared with the prior art, the invention provides the dry vibroflotation gravel pile for soft foundation treatment and the construction method thereof, and the dry vibroflotation gravel pile has the following beneficial effects:
1. compared with the traditional vibroflotation gravel pile which is difficult to be applied to soft soil and ultra-soft soil foundations, the invention combines the bagged sand well with the vibroflotation gravel pile process to form a sand bag group in advance, the sand bag group can provide certain wrapping force, and then the vibration pile is formed to effectively avoid settlement, so that the vibroflotation gravel pile is applied to the soft soil and ultra-soft soil foundations, and has obvious technical advantages;
2. the invention adopts the squeezing and expanding steel pipe to play the roles of expanding and guiding the hole for the sinking of the vibroflot, so that the pile-forming mode of the gravel pile can adopt dry vibroflot, namely only vibration is adopted, and high-pressure water impact is not adopted, thereby not only saving water resources, but also avoiding the problem of waste slurry treatment after the traditional vibroflot gravel pile is formed, and being beneficial to environmental protection;
3. in the process of forming the pile by pulling up the vibration of the vibroflotation device, the sand material in the sand bag group is also extruded compactly, and the sand bag is changed into the sand bag pile, so that the bearing capacity of the dry vibroflotation gravel pile is further promoted to be improved to a certain extent.
Drawings
FIG. 1 is a schematic view of a dry vibro-replacement stone column for soft foundation treatment;
FIG. 2 is a cross-sectional view of a dry vibro-replacement stone column for soft foundation treatment;
FIG. 3 is a schematic perspective view of a sandbag cluster;
FIG. 4 is a schematic diagram of the construction of the sinking pipe;
FIG. 5 is a schematic perspective view of the lowering of a group of sandbags;
FIG. 6 is a schematic view of a reamed hole formation;
FIG. 7 is a top view of a reamed hole;
FIG. 8 is a schematic illustration of a fragmented fabrication of a gravel column;
FIG. 9 is a schematic view of the formation of a crushed stone column;
fig. 10 is a flow chart of dry vibro-replacement stone column construction for soft foundation treatment.
In the figure: 1. soft foundation; 2. a sandstone cushion layer; 3. a group of sand bags; 4. a gravel column; 5. a sand bag; 6. hemp ropes; 7. sinking the pipe; 8. extruding and expanding a steel pipe; 9. a vibroflotation device; 10. extruding and expanding holes; 11. crushing stone; 12. the bag loop.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
It will be understood by those skilled in the art that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the referenced device or element must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the invention.
A construction method of a dry vibroflotation gravel pile for soft foundation treatment comprises the following steps:
1) as shown in fig. 3, bag loops 12 are sewn on each sand bag at certain intervals, air-dried sand is used for filling and compacting the sand bags 5, the bag openings are tightened, the filled sand bags 5 are free from interruption and twisting phenomena, one ends of a plurality of sand bags 5 are connected together according to the pile forming requirement, and then hemp ropes 6 are adopted to penetrate through the bag loops 12 to be bound together at certain intervals to prepare a sand bag group 3;
2) as shown in fig. 4, the pile position is determined through measurement and setting-out, machines such as a pile driver and the like are in place, a sinking pipe 7 with a valve pile tip is adopted, and the pile tip is arranged and then is driven into the sinking pipe 7 to the designed depth by adopting a vibration method;
3) as shown in fig. 5, the whole sand bag group 3 is lifted, the connected end parts are placed into the mouth of the immersed tube 7, the tail of the sand bag is pulled to pass through the roller at the inlet of the immersed tube 7, the sand bag group 3 is stably and rapidly sent into the immersed tube 7, and the sand bag group 3 is controlled to be slowly lowered to the bottom of the immersed tube 7;
4) when the immersed tube 7 is pulled up, starting a micro-vibrator (the micro-vibrator is common in the construction process, is convenient to pull out when in use and does not have a sand bag group), then lifting the immersed tube 7, continuously and slowly pulling up until the immersed tube 7 is completely pulled out, and leaving the sand bag group 3 in the soft foundation 1;
5) as shown in fig. 6 and 7, inserting the squeezing and expanding steel pipe 8 into the center of the formed sand bag group 3 to the bottom end of the sand bag group 3, then slowly and spirally pulling up the squeezing and expanding steel pipe 8, and finally forming a squeezing and expanding hole 10; before inserting the extruding and expanding steel pipe 8, the outer side of the extruding and expanding steel pipe 8 needs to be lubricated;
6) as shown in fig. 8, putting crushed stone 11 into the enlarged hole 10, controlling the height of the crushed stone 11 at 0.5-1.0 m, manufacturing the crushed stone column 4 by sections, hoisting the vibroflot 9 by a crane to align with the enlarged hole 10 of the pile position, then putting the vibroflot 9 into the hole, starting the vibroflot 9, starting the dry vibroflot/waterless vibroflot 11, and setting the vibration retention time;
7) as shown in fig. 9, the vibroflot 9 is tapped after the filling, the vibroflot 9 is closed and lifted out of the orifice, and the step 6) is repeated until the through-length gravel column 4 is formed;
8) as shown in fig. 1, 2 and 10, after the vibration compaction reinforcement is completed, the soil on the top surface of the pile is shoveled, the ground is leveled, a 30cm sand-gravel cushion layer 2 is paved and compacted, the sand bag group 3 higher than the cushion layer is cut off, the bag opening is tied again, the sand bag group 3 exposed out of the ground is buried into the sand-gravel cushion layer 2, the buried length is more than 30cm or meets the design requirement, and finally the pile manufacturing process of the dry vibration-impact gravel pile for soft foundation treatment is completed.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
The present invention is not limited to the above-mentioned preferred embodiments, and any other products in various forms can be obtained by anyone in the light of the present invention, but any changes in the shape or structure thereof, which have the same or similar technical solutions as those of the present application, fall within the protection scope of the present invention.
Claims (5)
1. A dry-type vibroflotation gravel pile for soft foundation treatment and a construction method thereof are characterized in that: the method comprises the following steps:
1) sewing bag loops (12) on each sand bag at certain intervals, filling the sand bags (5) with air-dried sand to be full and compact, tightening bag openings, connecting one ends of a plurality of sand bags (5) together according to the pile forming requirement without interruption and twisting phenomena, and then binding the sand bags (5) together through the bag loops (12) by adopting hemp ropes (6) to form a sand bag group (3);
2) determining the position of a pile through measurement and setting-out, positioning machines such as a pile driver and the like, adopting a sinking pipe (7) containing a valve pile tip, arranging the pile tip, and then driving the pile tip into the sinking pipe (7) to a designed depth by adopting a vibration method;
3) hoisting the whole sand bag group (3), putting the end parts connected together into the mouth of the immersed tube (7), pulling the bag tail to pass through an inlet roller of the immersed tube (7), stably and rapidly sending the sand bag group (3) into the immersed tube (7), and controlling the sand bag group (3) to be slowly lowered to the bottom of the immersed tube (7);
4) when the immersed tube (7) is pulled up, the micro-vibrator is started firstly, then the immersed tube (7) is lifted, the immersed tube is continuously and slowly pulled up until the immersed tube (7) is completely pulled out, and the sand bag group (3) is left in the soft foundation (1);
5) preparing an extrusion-expansion steel pipe (8), lubricating the outer side of the extrusion-expansion steel pipe (8), inserting the extrusion-expansion steel pipe (8) to the bottom end of the sand bag group (3) at the center of the formed sand bag group (3) after lubrication, then slowly and spirally pulling up the extrusion-expansion steel pipe (8), and finally forming an extrusion-expansion hole (10);
6) putting broken stones (11) into the squeezed holes (10), controlling the height of the broken stones (11) to be 0.5-1.0 m, manufacturing the broken stone column (4) in a segmented manner, hoisting a vibroflot (9) by a crane to align the squeezed holes (10) at the pile position, then putting the vibroflot (9) into the holes, starting the vibroflot (9), starting dry vibroflot/waterless vibration of the broken stones (11), and setting the vibration remaining time;
7) compacting by using the vibroflot (9) after filling, closing the vibroflot (9), lifting out the orifice, and repeating the step 6 until the through-long gravel column (4) is formed;
8) after the vibration compaction reinforcement is completed, soil on the top surface of the pile is shoveled, the ground is leveled, a 30cm gravel cushion layer (2) is paved and compacted, a sand bag group (3) higher than the cushion layer part is cut off, the bag opening is tied firmly again, the sand bag group (3) exposed out of the ground is buried into the gravel cushion layer (2), the buried length is larger than 30cm or meets the design requirement, and finally the pile manufacturing process of the dry vibration-washed gravel pile for soft foundation treatment is completed.
2. The dry vibro-replacement stone column for soft foundation treatment and its construction method as claimed in claim 1, wherein: and 5) the extruded and expanded steel pipe (8) is a hollow equal-diameter steel pipe.
3. The dry vibro-replacement stone column for soft foundation treatment and its construction method as claimed in claim 1, wherein: and 5) the bottom of the extruded and expanded steel pipe (8) is in a closed hemispherical shape.
4. The dry vibro-replacement stone column for soft foundation treatment and its construction method as claimed in claim 1, wherein: and 5), the outer diameter of the extruded and expanded steel pipe (8) is larger than that of the vibroflot (9).
5. A dry-type vibroflotation gravel pile for soft foundation is handled which characterized in that: the dry vibro-replacement stone pile for soft foundation treatment according to any one of claims 1 to 4 and the construction method thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011221860.XA CN112359815A (en) | 2020-11-05 | 2020-11-05 | Dry-type vibroflotation gravel pile for soft foundation treatment and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011221860.XA CN112359815A (en) | 2020-11-05 | 2020-11-05 | Dry-type vibroflotation gravel pile for soft foundation treatment and construction method thereof |
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| Publication Number | Publication Date |
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| CN112359815A true CN112359815A (en) | 2021-02-12 |
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| CN202011221860.XA Withdrawn CN112359815A (en) | 2020-11-05 | 2020-11-05 | Dry-type vibroflotation gravel pile for soft foundation treatment and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114351681A (en) * | 2021-12-30 | 2022-04-15 | 中国水利水电第七工程局有限公司 | Construction method for back filter layer of vibroflotation pile |
| CN114875886A (en) * | 2022-06-09 | 2022-08-09 | 中国电建集团成都勘测设计研究院有限公司 | Construction method of expanding vibroflotation gravel pile |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2104880U (en) * | 1991-04-01 | 1992-05-20 | 顾尧章 | Pile made of sand and crushed stone |
| CN1793525A (en) * | 2006-01-05 | 2006-06-28 | 江苏南水土建工程公司 | Novel method for reinforcing deep soft foundition-cencrete core sand stone pile compound foundition method |
| CN101899827A (en) * | 2009-06-01 | 2010-12-01 | 严平 | Broken soil vibration and compaction treatment method by utilizing impact hammer in immersed tube in riprap filled foundation |
| CN102433876A (en) * | 2011-08-31 | 2012-05-02 | 浙江大学城市学院 | Multi-compartment casing composite pile and construction method thereof |
| CN104652408A (en) * | 2015-02-13 | 2015-05-27 | 福建省建专岩土工程有限公司 | Strip-shaped sand bag pile and construction method thereof |
| CN106939597A (en) * | 2017-03-22 | 2017-07-11 | 广州市建誉科技有限责任公司 | A kind of semi-flexible stake and its construction method with drain function |
| CN107246000A (en) * | 2017-06-30 | 2017-10-13 | 山东科技大学 | A kind of method that high polymer reinforces reclaimed ground |
| KR20190128820A (en) * | 2018-05-09 | 2019-11-19 | 대구대학교 산학협력단 | Improvement of soft ground utilizing vertical drain of taper shape |
-
2020
- 2020-11-05 CN CN202011221860.XA patent/CN112359815A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2104880U (en) * | 1991-04-01 | 1992-05-20 | 顾尧章 | Pile made of sand and crushed stone |
| CN1793525A (en) * | 2006-01-05 | 2006-06-28 | 江苏南水土建工程公司 | Novel method for reinforcing deep soft foundition-cencrete core sand stone pile compound foundition method |
| CN101899827A (en) * | 2009-06-01 | 2010-12-01 | 严平 | Broken soil vibration and compaction treatment method by utilizing impact hammer in immersed tube in riprap filled foundation |
| CN102433876A (en) * | 2011-08-31 | 2012-05-02 | 浙江大学城市学院 | Multi-compartment casing composite pile and construction method thereof |
| CN104652408A (en) * | 2015-02-13 | 2015-05-27 | 福建省建专岩土工程有限公司 | Strip-shaped sand bag pile and construction method thereof |
| CN106939597A (en) * | 2017-03-22 | 2017-07-11 | 广州市建誉科技有限责任公司 | A kind of semi-flexible stake and its construction method with drain function |
| CN107246000A (en) * | 2017-06-30 | 2017-10-13 | 山东科技大学 | A kind of method that high polymer reinforces reclaimed ground |
| KR20190128820A (en) * | 2018-05-09 | 2019-11-19 | 대구대학교 산학협력단 | Improvement of soft ground utilizing vertical drain of taper shape |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114351681A (en) * | 2021-12-30 | 2022-04-15 | 中国水利水电第七工程局有限公司 | Construction method for back filter layer of vibroflotation pile |
| CN114351681B (en) * | 2021-12-30 | 2023-05-05 | 中国水利水电第七工程局有限公司 | Construction method of vibroflotation pile reverse filtering layer |
| CN114875886A (en) * | 2022-06-09 | 2022-08-09 | 中国电建集团成都勘测设计研究院有限公司 | Construction method of expanding vibroflotation gravel pile |
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Application publication date: 20210212 |