CN116201101A - Construction method of ultra-long plain soil compaction pile in collapsible loess area with low water content - Google Patents
Construction method of ultra-long plain soil compaction pile in collapsible loess area with low water content Download PDFInfo
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- CN116201101A CN116201101A CN202310174277.5A CN202310174277A CN116201101A CN 116201101 A CN116201101 A CN 116201101A CN 202310174277 A CN202310174277 A CN 202310174277A CN 116201101 A CN116201101 A CN 116201101A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 238000005056 compaction Methods 0.000 title claims abstract description 52
- 238000010276 construction Methods 0.000 title claims abstract description 52
- 239000002689 soil Substances 0.000 title claims abstract description 37
- 238000002347 injection Methods 0.000 claims abstract description 55
- 239000007924 injection Substances 0.000 claims abstract description 55
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 239000004576 sand Substances 0.000 claims abstract description 6
- 238000013461 design Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 238000003973 irrigation Methods 0.000 claims description 3
- 230000002262 irrigation Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000009751 slip forming Methods 0.000 claims description 3
- 238000012549 training Methods 0.000 claims description 3
- 238000005336 cracking Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007726 management method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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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
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- 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 discloses a construction method of an ultra-long soil compaction pile in a collapsible loess area with low water content, which comprises the steps of construction preparation, leveling of the field, measurement paying-off, equipment assembly in place, hole introduction of water injection holes, hole forming, sand filling, water injection, water content detection, compaction pile construction, detection and the like, wherein a short rod long spiral short rod hole introduction and motor driving are adopted, secondary hole forming is carried out by using a pile sinking pipe with a corresponding length, a diesel hammer is used for ramming and sinking, and the water injection pile sinking pipe extension is connected in an ultra-long pile sinking pipe extension mode; the method solves the problems of how to ensure the quality and the quality to moisten the foundation and the compaction pile construction under the condition of low water content of geology when the foundation treatment adopts a plain soil compaction pile scheme in construction in the ultra-thick collapsible loess area, and particularly solves the problem that the conventional equipment and technology can not treat.
Description
Technical Field
The invention relates to the technical field of house building foundation treatment, in particular to a construction method of a super-long plain soil compaction pile in a collapsible loess area with low water content.
Background
In order to effectively control the construction cost of low-rise and multi-storey building foundation engineering, in particular to avoid the design scheme of ultra-long pile foundation engineering, so as to control the investment ratio of the foundation and the main body, the foundation is selectively treated in the low-rise building design of collapsible loess areas in recent years, and in particular, a plain soil compaction pile treatment process is selected. However, the conventional compaction pile has a treatment depth of 15m or less, and construction equipment and technology for treating compaction piles with lengths of 25m or more in loess areas with super thickness are fewer in China.
Disclosure of Invention
The invention aims to provide a construction method of an ultra-long soil compaction pile in a collapsible loess area with low water content, which is used for solving the problems that when the construction is performed in the collapsible loess area with ultra-thick, the foundation is humidified and the compaction pile is constructed by maintaining the quality and guaranteeing the quality under the condition of low water content when the foundation treatment adopts an plain soil compaction pile scheme, and particularly solving the problem that conventional equipment and technology cannot be used for treatment.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a construction method of a collapsible loess region ultra-long plain soil compaction pile with low water content comprises the following steps:
s1: and (3) preparation of construction: planning the planar arrangement of a construction site, including equipment assembly, material stacking, oil storage, earthwork storage, temporary line arrangement;
s2: leveling a field: leveling the site according to the elevation and the range of the designed pile top, and leveling all the areas with the height difference according to the highest elevation;
s3: and (3) measuring and paying off: setting one or more control points according to the range and the arrangement shape of the compaction piles, discharging pile positions through the control points, arranging according to isosceles triangles, and marking;
s4: the equipment is assembled in place: assembling a water injection and pipe sinking pile machine;
s5: leading and forming water injection holes: the arrangement position of the water injection holes is the same as the position of the compaction pile, and holes are continuously formed;
s6: sand filling and water injection: immediately pouring gravel with the particle size of 10-30 mm and the mud content of less than 5% into the hole when the hole forming is completed by 100 square meters; then, an artificial spade is utilized to scoop soil or a machine is used for piling up a soil ridge with the height of about 30 cm;
s7: and (3) water content detection: after 15 days of dissipation, the foundation soil water content after water injection is detected, compaction pile construction is carried out after the optimal water content is reached, and if not, water injection is continued;
s8: and (3) compaction pile construction: sequentially forming holes, tamping Kong Nasu soil, and surviving four times;
s9: and (3) detection: and detecting the compactness of piles and pile bodies, and judging whether the bearing capacity of the foundation meets the design requirement.
Furthermore, in the step S1, enough technical and quality post management staff are specifically provided according to engineering requirements, the design drawings are familiar, equipment and materials required by construction are prepared, on-site operators are provided according to progress requirements, and detailed technical engagement and training are performed.
Furthermore, in S2, leveling is performed according to the highest pile top elevation to prevent the high elevation site from cracking and sinking during the construction of the compaction pile at the bottom elevation, and the compaction pile at the height difference is poor in construction quality and difficult in pile foundation station.
And in the step S5, a short rod long spiral short rod guiding hole is adopted, the guiding hole depth is 12m, a motor is adopted to drive, a pile sinking pipe with a corresponding length is used for secondary hole forming, a diesel hammer is used for ramming and sinking, and the water injection pile sinking pipe extension is connected in an ultra-long pile sinking pipe extension mode.
Still further, the gravel should be filled to the ports and stacked in a cone at the water injection hole ports in S6.
Furthermore, the single-hole water injection quantity in S6 is calculated according to soil layer thickness, water injection area and optimal water content parameters, a water meter is arranged in the middle of a water injection pipeline before water injection, water injection time and water injection quantity of each unit cell are recorded, and 20cm water head flood irrigation type water immersion is maintained.
Furthermore, in S8, an ultra-long pile sinking pipe is adopted for section-by-section extension, so that the hole forming of the ultra-long compaction pile is realized, the filling is carried out when the filling in the hole reaches the optimal water content, and each filling amount, the number of times of tamping and the tamping lifting height are determined through experiments according to the weight of the tamping hammer.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a construction method of an ultra-long soil compaction pile in a collapsible loess area with low water content, which comprises the steps of construction preparation, leveling of a field, measurement paying-off, equipment assembly in place, hole introduction of water injection holes, hole forming, sand filling, water injection, water content detection, compaction pile construction, detection and the like, and solves the problems of how to guarantee the quality and guarantee the humidification of a foundation under the condition of low water content when the foundation treatment adopts an ultra-long soil compaction pile scheme in the collapsible loess area with the ultra-thick soil, and particularly solves the depth problem that conventional equipment and technology cannot handle.
Drawings
FIG. 1 is a flow chart of the construction process of the present invention;
FIG. 2 is a water injection hole forming sequence diagram of the present invention;
FIG. 3 is a pile forming sequence diagram of the compaction pile of the present invention;
fig. 4 is a water injection driving circuit diagram of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, the embodiment of the invention provides a construction method of an ultra-long plain soil compaction pile in a collapsible loess area with low water content, which comprises the following steps:
step one: and (3) preparation of construction: and (3) providing enough technical and quality post management staff according to engineering requirements, familiarizing design drawings, preparing equipment and materials required by construction and other works, providing on-site operators according to the requirements of progress and the like, planning and carrying out detailed technical engagement and training. The planning of the planar arrangement of the construction site comprises equipment assembly, material stacking, oil storage, earthwork storage, temporary line arrangement and the like.
Step two: leveling a field: the method comprises the steps of flattening the site according to the designed pile top elevation and the range, flattening all areas with height differences according to the highest elevation, and processing according to the highest pile top elevation.
Step three: and (3) measuring and paying off: and setting one or more control points according to the range and the arrangement shape of the compaction piles, discharging pile positions through the control points, arranging according to isosceles triangles, and marking.
Step four: the equipment is assembled in place: water injection (immersed tube, long spiral), immersed tube pile machine, etc.
Step five: leading and forming water injection holes: the water injection holes are arranged at the same compaction pile position, holes are continuously formed, the water injection holes are formed according to the sequence shown in the figure 2, the depth of the conventional foundation humidification water injection holes is less than or equal to 15m, the diameter of the water injection holes is 150-200 mm, the depth of the holes is 1m shorter than the length of the piles, the holes can be formed at one time, if the conventional construction process is adopted, pile sinking pipes are required to be welded and lengthened, so that the pile sinking pipes shake, bending deformation, frequent deviation of a hammer seat and the like are caused.
Step six: sand filling and water injection: when the pore-forming is completed by 100 square meters, gravel with the particle size of 10mm-30mm and the mud content of less than 5% is immediately poured into the pores, the gravel is filled into the pore openings and piled into a cone shape at the pore openings of the water injection pores, and then the artificial spade is utilized to shoveling soil or mechanically piling up soil ridges with the height of about 30cm, so that the water blocking effect is realized.
The single-hole water injection quantity is calculated according to parameters such as soil layer thickness, water injection area, optimal water content and the like. Before water injection, a water meter is arranged in the middle of a water injection pipeline, the water injection time and the water injection quantity of each unit cell are recorded, and a water head of 20cm is required to be maintained for flood irrigation type water immersion. The cofferdam ridge and water injection mode is carried out according to figure 4.
Step seven: and (3) water content detection: after 15 days of dissipation, the foundation soil water content after water injection is detected, compaction pile construction is carried out after the optimal water content is reached, and otherwise water injection is continued.
Step eight: and (3) compaction pile construction: and (3) sequentially forming holes according to the figure 3, tamping Kong Nasu soil, and surviving four times. When the depth of the pile hole of the compaction pile exceeds 25m, the pile sinking pipe is too long, and the conventional mechanical support frame is not enough in height, so that the ultra-long pile sinking pipe invented by the company is lengthened section by section, and the hole forming of the ultra-long compaction pile is realized. And (3) filling when the optimal water content of the filler in the hole is reached, and performing test determination on the filling quantity, the ramming times and the ramming lifting height of each time according to the weight of the rammer.
Step nine: and (3) detection: and detecting the compactness of piles and pile bodies, and judging whether the bearing capacity of the foundation meets the design requirement.
To sum up: the invention provides a construction method of an ultralong soil compaction pile in a collapsible loess area with low water content, which comprises the steps of construction preparation, leveling of the field, measurement paying-off, equipment assembly in place, hole introduction of water injection holes, hole forming, sand filling, water injection, water content detection, compaction pile construction, detection and the like, wherein short-rod long-spiral short-rod hole introduction is adopted, and a motor is adopted to drive the compaction pile, secondary hole forming is carried out by using a pile sinking pipe with corresponding length, the compaction is carried out by using a diesel hammer, and the extension of the water injection pile sinking pipe is connected in an ultralong pile sinking pipe extension mode; the method solves the problems of how to ensure the quality and the quality to moisten the foundation under the condition of low water content of geology and the construction of the compaction pile when the foundation treatment adopts a plain soil compaction pile scheme in the construction of the ultra-thick collapsible loess area, and particularly solves the depth problem that the conventional equipment and technology can not treat.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should be covered by the protection scope of the present invention by making equivalents and modifications to the technical solution and the inventive concept thereof.
Claims (7)
1. The construction method of the ultra-long plain soil compaction pile in the collapsible loess area with low water content is characterized by comprising the following steps:
s1: and (3) preparation of construction: planning the planar arrangement of a construction site, including equipment assembly, material stacking, oil storage, earthwork storage, temporary line arrangement;
s2: leveling a field: leveling the site according to the elevation and the range of the designed pile top, and leveling all the areas with the height difference according to the highest elevation;
s3: and (3) measuring and paying off: setting one or more control points according to the range and the arrangement shape of the compaction piles, discharging pile positions through the control points, arranging according to isosceles triangles, and marking;
s4: the equipment is assembled in place: assembling a water injection and pipe sinking pile machine;
s5: leading and forming water injection holes: the arrangement position of the water injection holes is the same as the position of the compaction pile, and holes are continuously formed;
s6: sand filling and water injection: immediately pouring gravel with the particle size of 10-30 mm and the mud content of less than 5% into the hole when the hole forming is completed by 100 square meters; then, an artificial spade is utilized to scoop soil or a machine is used for piling up a soil ridge with the height of about 30 cm;
s7: and (3) water content detection: after 15 days of dissipation, the foundation soil water content after water injection is detected, compaction pile construction is carried out after the optimal water content is reached, and if not, water injection is continued;
s8: and (3) compaction pile construction: sequentially forming holes, tamping Kong Nasu soil, and surviving four times;
s9: and (3) detection: and detecting the compactness of piles and pile bodies, and judging whether the bearing capacity of the foundation meets the design requirement.
2. The construction method of the ultra-long plain soil compaction pile in the collapsible loess area with low water content as set forth in claim 1, wherein the construction method comprises the following steps: and S1, specific staff for managing the technical and quality posts are equipped according to engineering requirements, familiarity is carried out on design drawings, equipment and materials required by construction are prepared, on-site operators are equipped according to progress requirements, and detailed technical engagement and training are carried out.
3. The construction method of the ultra-long plain soil compaction pile in the collapsible loess area with low water content as set forth in claim 1, wherein the construction method comprises the following steps: and S2, leveling according to the highest pile top elevation is used for preventing the site at the high elevation from cracking and sinking when the compaction pile at the bottom elevation is constructed, and the compaction pile at the high-low elevation has poor construction quality and difficult pile foundation station.
4. The construction method of the ultra-long plain soil compaction pile in the collapsible loess area with low water content as set forth in claim 1, wherein the construction method comprises the following steps: s5, adopting a short rod long spiral short rod hole, leading the hole to have a depth of 12m, adopting a motor to drive, then using a pile sinking pipe with a corresponding length to secondarily hole, using a diesel hammer to ram and sink, and connecting the water injection pile sinking pipe according to an ultra-long pile sinking pipe lengthening mode.
5. The construction method of ultra-long soil compaction pile for collapsible loess areas with low water content as set forth in claim 1, wherein the gravel is filled up to the hole and piled up in a cone shape in the water injection hole in S6.
6. The construction method of the ultra-long soil compaction pile in the collapsible loess area with low water content as set forth in claim 1, wherein the single-hole water injection quantity in the S6 is calculated according to soil layer thickness, water injection area and optimal water content parameters, a water meter is arranged in the middle of a water injection pipeline before water injection, water injection time and water injection quantity of each unit cell are recorded, and water head flood irrigation type immersion of 20cm is maintained.
7. The construction method of the ultra-long soil compaction pile in the collapsible loess area with low water content as set forth in claim 1, wherein in the step S8, an ultra-long pile sinking pipe is adopted for carrying out section-by-section extension, so that the hole forming of the ultra-long compaction pile is realized, the filling is carried out when the filling in the hole reaches the optimal water content, and each filling amount, the number of times of tamping and the tamping lifting height are determined according to the weight of the tamping.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310174277.5A CN116201101A (en) | 2023-02-28 | 2023-02-28 | Construction method of ultra-long plain soil compaction pile in collapsible loess area with low water content |
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| CN202310174277.5A CN116201101A (en) | 2023-02-28 | 2023-02-28 | Construction method of ultra-long plain soil compaction pile in collapsible loess area with low water content |
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| CN116201101A true CN116201101A (en) | 2023-06-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117589632A (en) * | 2024-01-18 | 2024-02-23 | 山西金宝岛基础工程有限公司 | Method for testing water content in foundation water injection humidifying process through dynamic compaction |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106522191A (en) * | 2016-10-28 | 2017-03-22 | 青海送变电工程公司 | Transformer substation foundation treatment method and application thereof |
| CN107905212A (en) * | 2017-09-27 | 2018-04-13 | 中铁三局集团有限公司 | A kind of construction method of original position water filling element earth pile composite foundation |
| CN113832950A (en) * | 2021-08-19 | 2021-12-24 | 中电建十一局工程有限公司 | Construction method of plain soil compaction pile |
| CN217460530U (en) * | 2022-04-12 | 2022-09-20 | 甘肃省建设监理有限责任公司 | Pile forming guide pipe for lengthening assembled ultra-long compaction pile |
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2023
- 2023-02-28 CN CN202310174277.5A patent/CN116201101A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106522191A (en) * | 2016-10-28 | 2017-03-22 | 青海送变电工程公司 | Transformer substation foundation treatment method and application thereof |
| CN107905212A (en) * | 2017-09-27 | 2018-04-13 | 中铁三局集团有限公司 | A kind of construction method of original position water filling element earth pile composite foundation |
| CN113832950A (en) * | 2021-08-19 | 2021-12-24 | 中电建十一局工程有限公司 | Construction method of plain soil compaction pile |
| CN217460530U (en) * | 2022-04-12 | 2022-09-20 | 甘肃省建设监理有限责任公司 | Pile forming guide pipe for lengthening assembled ultra-long compaction pile |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117589632A (en) * | 2024-01-18 | 2024-02-23 | 山西金宝岛基础工程有限公司 | Method for testing water content in foundation water injection humidifying process through dynamic compaction |
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