CN119411574A - A solidified soft soil bearing layer FRP-steel honeycomb web photovoltaic pile foundation and construction method - Google Patents
A solidified soft soil bearing layer FRP-steel honeycomb web photovoltaic pile foundation and construction method Download PDFInfo
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- CN119411574A CN119411574A CN202510020555.0A CN202510020555A CN119411574A CN 119411574 A CN119411574 A CN 119411574A CN 202510020555 A CN202510020555 A CN 202510020555A CN 119411574 A CN119411574 A CN 119411574A
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- 239000000835 fiber Substances 0.000 claims abstract description 66
- 238000004804 winding Methods 0.000 claims abstract description 35
- 239000004567 concrete Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 22
- 239000002893 slag Substances 0.000 claims description 22
- 239000002131 composite material Substances 0.000 claims description 21
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- 229920005989 resin Polymers 0.000 claims description 15
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- 230000008569 process Effects 0.000 claims description 10
- 238000007711 solidification Methods 0.000 claims description 10
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- 229920002748 Basalt fiber Polymers 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 6
- 239000004917 carbon fiber Substances 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 6
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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
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/06—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against corrosion by soil or water
-
- 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
- E02D7/02—Placing by driving
- E02D7/06—Power-driven drivers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Paleontology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Piles And Underground Anchors (AREA)
Abstract
本发明涉及软土桩基工程技术领域，具体为一种固化软土持力层FRP‑钢蜂窝腹板光伏桩基及施工方法，桩基包括FRP‑钢蜂窝腹板光伏桩基和固化软土持力层，FRP‑钢蜂窝腹板光伏桩基底部设在固化软土持力层中，其顶部位于地面上方；FRP‑钢蜂窝腹板光伏桩基包括芯模、混凝土、缠绕纤维层，芯模包括十字型钢立柱和FRP套管，十字型钢立柱的腹板上、FRP套管的两个直板上均设有贯穿孔，FRP套管固定在十字型钢立柱相邻两个腹板之间，每个FRP套管直板上的贯穿孔与其对应的十字型钢立柱腹板上的贯穿孔数量位置对应，FRP套管内浇筑混凝土，缠绕纤维层设在芯模外侧。本发明降低了光伏桩基的重量和成本，提高了光伏桩基在软土区的耐久性和稳定性。
The present invention relates to the field of soft soil pile foundation engineering technology, specifically a solidified soft soil bearing layer FRP steel honeycomb web photovoltaic pile foundation and a construction method, the pile foundation includes an FRP steel honeycomb web photovoltaic pile foundation and a solidified soft soil bearing layer, the bottom of the FRP steel honeycomb web photovoltaic pile foundation is arranged in the solidified soft soil bearing layer, and its top is located above the ground; the FRP steel honeycomb web photovoltaic pile foundation includes a core mold, concrete, and a winding fiber layer, the core mold includes a cross-shaped steel column and an FRP sleeve, and through holes are provided on the web of the cross-shaped steel column and the two straight plates of the FRP sleeve, and the FRP sleeve is fixed between two adjacent webs of the cross-shaped steel column, and the through holes on each FRP sleeve straight plate correspond to the number of through holes on the web of the corresponding cross-shaped steel column, concrete is poured in the FRP sleeve, and the winding fiber layer is arranged outside the core mold. The present invention reduces the weight and cost of the photovoltaic pile foundation, and improves the durability and stability of the photovoltaic pile foundation in the soft soil area.
Description
Technical Field
The invention relates to the technical field of soft soil pile foundation engineering, in particular to an FRP-steel honeycomb web photovoltaic pile foundation for a solidified soft soil bearing layer and a construction method.
Background
The soft soil in China is widely distributed and mainly concentrated in coastal areas, downstream in rivers, around lakes, mountain areas, valley plain areas and the like, and the soft soil has engineering characteristics of high compressibility, low strength, rheological property, non-uniformity, poor water permeability and the like, so that engineering conditions taking soft soil as a foundation are very complex, and particularly the corrosive effects of saline-alkali environments in soft soil areas such as beach areas in coastal areas are greatly influenced.
Because the photovoltaic power generation needs to occupy a large amount of sites, the distribution of the photovoltaic power station is mainly positioned in soft soil areas such as deserts, coasts and mudflat at river sides at present, and PHC tubular piles are basically adopted as the basis of the photovoltaic power station which is built in the soft soil areas at present. PHC tubular pile has advantages such as production technology is mature, cost is cheap, but because PHC tubular pile material is concrete, and the quality is great, transportation and construction are inconvenient, also have subsidence serious, stability not good problem in soft soil area, have caused very big influence to long-term operation, consequently, the basis lightening is an important trend of weak soil photovoltaic foundation development. Meanwhile, in soft soil areas, the photovoltaic pile foundation is mostly distributed in coastal areas, such as beach areas and other environments, the photovoltaic pile foundation is possibly corroded by seawater, and particularly the PHC pipe pile commonly used at present is poor in corrosion resistance and easy to corrode, so that the service life of the photovoltaic pile foundation is greatly reduced, and the corrosion resistance of the photovoltaic pile foundation is also a very important problem.
Disclosure of Invention
In order to solve the problems in the background art, reduce the possibility of sedimentation of the photovoltaic pile foundation in soft soil areas and improve the stability and corrosion resistance of the photovoltaic pile foundation, the invention provides an FRP-steel honeycomb web photovoltaic pile foundation for solidifying a soft soil bearing layer and a construction method, and the technical scheme is as follows:
The FRP-steel honeycomb web photovoltaic pile foundation comprises a soft soil area filled with soft soil curing materials and an FRP-steel honeycomb web photovoltaic pile foundation, wherein the soft soil area is the cured soft soil supporting layer, the bottom of the FRP-steel honeycomb web photovoltaic pile foundation is buried in the cured soft soil supporting layer, and the top of the FRP-steel honeycomb web photovoltaic pile foundation extends above the ground;
The FRP-steel honeycomb web photovoltaic pile foundation comprises a cylindrical core mold, concrete and winding fiber layers, wherein the core mold comprises a cross steel upright post and four FRP sleeves, honeycomb through holes are formed in webs of the cross steel upright post, the FRP sleeves are in a quarter arc shape, each of two straight plates of each FRP sleeve is provided with a honeycomb through hole, four FRP sleeves are respectively fixed between two adjacent webs of the cross steel upright post, the through holes in each straight plate of each FRP sleeve correspond to the number of the through holes in the web of the corresponding cross steel upright post, the concrete is poured in each FRP sleeve, and the winding fiber layers are arranged outside the core mold.
Preferably, the solidified soft soil bearing layer is positioned in the range of 2/3 pile length upwards and 1/3 pile length downwards from the bottom of the FRP-steel honeycomb web photovoltaic pile foundation.
Preferably, the soft soil curing material comprises 15-20% of granulated blast furnace slag, 8-12% of fly ash, 3-6% of carbide slag, 5-10% of phosphogypsum, 0.8-1.2% of straw fiber, 0.5-1% of alkali-activator and 10-15% of water.
Preferably, the preparation method of the FRP-steel honeycomb web photovoltaic pile foundation comprises the following steps:
Prefabricating cross steel upright posts and FRP (fiber reinforced plastic) sleeves, wherein the FRP sleeves are arranged between two adjacent webs of each cross steel upright post, and through holes in straight side plates of the FRP sleeves correspond to through holes in webs of the cross steel upright posts one by one;
the FRP sleeve is fixedly connected with the cross-shaped steel upright post through epoxy resin, and the FRP sleeve and the cross-shaped steel upright post are fixed to form a core mold;
and winding fiber composite materials on the outer surface of the core mold to form a winding fiber layer on the outer side of the core mold.
Preferably, the preparation process of the winding fiber layer comprises the steps of directly adopting resin for impregnating a fiber composite material under the action of tension, continuously winding the impregnated fiber composite material on the outer surface of a core mold in a continuous mode according to a wet winding forming process, wherein the winding layer number is at least four, the winding angle of each layer of fiber composite material is 75 degrees, 60 degrees, 45 degrees and 30 degrees in sequence from inside to outside, and heating and curing after winding is finished to obtain a winding fiber layer arranged on the outer side of the core mold;
The fiber in the fiber composite material is any one of carbon fiber, glass fiber, basalt fiber and hybrid fiber.
Preferably, the FRP sleeve is manufactured by preparing fiber yarns from fiber reinforced composite materials, soaking the fiber yarns with resin, and finally preparing the FRP sleeve by an integral pultrusion process;
The resin for impregnation is any one of unsaturated resin, vinyl resin, epoxy resin and phenolic resin, and the fiber material in the fiber reinforced composite material is any one of carbon fiber, glass fiber, basalt fiber and hybrid fiber.
A construction method of a solidified soft soil bearing layer FRP-steel honeycomb web photovoltaic pile foundation is implemented based on the solidified soft soil bearing layer FRP-steel honeycomb web photovoltaic pile foundation, and comprises the following steps:
S1, determining pile foundation burial depth, calibrating pile positions, cleaning sundries, leveling and preliminarily compacting the land, and paving a facility work field;
s2, prospecting geological conditions, determining a construction scheme, and preparing a soft soil curing material;
S3, determining a soft soil area to be grouted according to a construction scheme, injecting soft soil curing materials into soft soil in a required range by grouting equipment, curing for 7d to 28d to form a cured soft soil bearing layer, detecting soil strength after curing is finished, and ensuring that the unconfined compressive strength of the cured soft soil bearing layer is not less than 2.5MPa;
s4, before the strength requirement of the soft soil bearing layer to be solidified is met, adopting a driving method or a static pressure method to construct the FRP-steel honeycomb web photovoltaic pile foundation;
s5, after the construction of the FRP-steel honeycomb web photovoltaic pile foundation is completed, sleeving a hoop at the top of the pile foundation, and fastening the hoop at a required position;
s6, installing a photovoltaic bracket and a photovoltaic plate on the anchor ear to finish pile foundation construction.
Preferably, the preparation method of the soft soil curing material in the step S2 includes:
a1, according to geological survey results and construction requirements, adjusting the proportions of granulated blast furnace slag, carbide slag, phosphogypsum, straw fibers, alkali-activated agent and water, and determining the proportions of the materials so as to meet the construction requirements;
a2, adding granulated blast furnace slag, carbide slag, phosphogypsum, straw fibers and water into a stirrer according to a proportion, and stirring and mixing to obtain a flow molding mixture;
a3, after the flow molding mixture is uniformly stirred, adding an alkali excitant into the stirrer, continuously stirring by the stirrer, and fully and uniformly stirring the flow molding mixture and the alkali excitant to obtain the soft soil curing material.
Preferably, the concrete construction method for curing the soft soil bearing layer in the step S3 is as follows:
b1, arranging grouting holes according to soft soil conditions and calibrated pile positions, drilling holes in the grouting holes by using a drilling machine or a hand drill, drilling holes to a required depth to obtain grouting holes, and detecting geological conditions;
b2, grouting is carried out by grouting equipment, the grouting equipment comprises a grouting injection pipe and a grouting pump, grouting through holes are formed in the pipe wall, close to the bottom end, of the grouting injection pipe, the bottom end of the grouting injection pipe is inserted into the grouting holes during grouting, and the top end of the grouting injection pipe is connected with the grouting pump;
B3, continuously injecting soft soil curing materials into soft soil in sections through a grouting pump and a grouting injection pipe;
And B4, slowly pulling out the grouting injection pipe after grouting is completed, and sealing the grouting hole;
and B5, curing and monitoring are carried out to ensure that the curing effect of the soft soil meets the requirement.
Preferably, the construction process of the FRP-steel honeycomb web photovoltaic pile foundation in the step S4 is as follows:
When the driving method is adopted, the pile foundation is firstly hammered by using low-energy, low-stroke or empty hammer of pile driving equipment, and then continuous normal hammering is carried out after confirming that the penetration direction of the pile body is not abnormal, after the pile bottom reaches the solidified soft soil bearing layer, the pile top is ensured to be still 1.5m above the ground surface, and after the pile foundation construction is finished, the strength and stability of each pile foundation are tested.
The invention has the beneficial effects that:
(1) According to the invention, the soft soil bearing layer is solidified by adopting a grouting process before the construction of the photovoltaic pile foundation, so that the mechanical properties of foundation soil around the pile foundation are improved, the stability of the pile foundation is improved, and the sedimentation is reduced.
(2) According to the invention, the soft soil curing material is prepared by adopting industrial waste and straw fibers, so that the purposes of waste utilization, low carbon and environmental protection are realized while the strength and uniformity of soft soil are improved.
(3) The FRP-steel honeycomb web photovoltaic pile foundation is formed by combining a plurality of materials including a steel structure, FRP materials, concrete and composite fibers, and adopts an innovative structure that an FRP sleeve is connected with a cross-shaped steel upright column, the FRP sleeve and the cross-shaped steel upright column form an integral cylindrical core mold, the fiber composite is wound on the outer side of the core mold, and the FRP sleeve corresponds to a through hole position of the cross-shaped steel upright column, so that the connection of the concrete in the four FRP sleeves can be ensured. The invention greatly reduces the weight of the pile foundation, improves the toughness, strength and corrosion resistance of the photovoltaic pile foundation, realizes the efficiency improvement in the construction and transportation stages, and reduces the long-term operation cost.
(4) The invention starts from the two aspects of the structural design of the photovoltaic pile foundation and the solidification of the bearing layer, wherein the photovoltaic pile foundation structure is provided with the FRP-steel honeycomb web plate which has high toughness, low weight, high strength and corrosion resistance, and the way of doping soft soil solidifying materials into the bearing layer of the pile foundation and improving the soft soil characteristics is provided. The invention solves the problems of easy sedimentation and poor durability of the photovoltaic pile foundation in soft soil areas, and compared with the traditional mainstream PHC pipe pile, the invention can greatly reduce the quality, realize the light weight of equipment, reduce the construction difficulty, improve the construction efficiency and reduce the later maintenance cost when the strength and the corrosion resistance of the pile foundation are improved by adopting the FRP material to manufacture the inner sleeve.
Drawings
FIG. 1 is a schematic elevational view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of the overall structure of the FRP-steel honeycomb web photovoltaic pile foundation of the invention;
FIG. 3 is a schematic view of the structure of the FRP sleeve of the present invention;
FIG. 4 is a schematic view of a cross-shaped steel column structure of the present invention;
FIG. 5 is a schematic diagram of the cross-sectional structure of the FRP-steel honeycomb web photovoltaic pile foundation of the invention;
FIG. 6 is a flow chart of the construction method of the present invention.
The drawing comprises a grouting pump 1, a grouting injection pipe 2, a solidified soft soil bearing layer 3, an FRP-steel honeycomb web photovoltaic pile foundation 4, a hoop 5, a photovoltaic bracket 6, a photovoltaic plate 7, a winding fiber layer 8, an FRP sleeve 9, 10, concrete and a cross steel column 11.
Detailed Description
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the present invention, the terms "inner, outer, upper, lower" and the like are established based on the positional relationship shown in the drawings, and the corresponding positional relationship may be changed depending on the drawings, and thus, the scope of protection is not to be construed as being absolutely limited.
Referring to fig. 1-5, the FRP-steel honeycomb web photovoltaic pile foundation of the solidified soft soil bearing layer comprises a soft soil area filled with a soft soil solidified material and an FRP-steel honeycomb web photovoltaic pile foundation 4, wherein the soft soil area is a solidified soft soil bearing layer 3, the bottom of the FRP-steel honeycomb web photovoltaic pile foundation 4 is embedded in the solidified soft soil bearing layer 3, the solidified soft soil bearing layer 3 is positioned in a range of 2/3 pile length upwards and 1/3 pile length downwards from the bottom of the FRP-steel honeycomb web photovoltaic pile foundation 4, and the top of the FRP-steel honeycomb web photovoltaic pile foundation 4 extends above the ground;
The FRP-steel honeycomb web photovoltaic pile foundation 4 comprises a cylindrical core mold, concrete 10 and winding fiber layers 8, wherein the core mold comprises a cross-shaped steel upright post 11 and four FRP sleeves 9, honeycomb through holes are formed in webs of the cross-shaped steel upright post 11, each FRP sleeve 9 is in a quarter arc shape, honeycomb through holes are formed in two straight plates of each FRP sleeve 9, the four FRP sleeves 9 are respectively fixed between two adjacent webs of the cross-shaped steel upright post 11, the through holes in each straight plate of each FRP sleeve 9 correspond to the number of the through holes in the corresponding web of the cross-shaped steel upright post 11, the concrete 10 is poured in each FRP sleeve 9, and the winding fiber layers 8 are arranged outside the core mold.
Specifically, the cross-shaped steel upright 11 is rolled from Q235B steel, and the concrete 10 is C30 concrete 10.
The soft soil curing material comprises 15-20% of granulated blast furnace slag, 8-12% of fly ash, 3-6% of carbide slag, 5-10% of phosphogypsum, 0.8-1.2% of straw fiber, 0.5-1% of alkali-activator and 10-15% of water.
Specifically, the preparation method of the FRP-steel honeycomb web photovoltaic pile foundation 4 comprises the following steps:
Prefabricating the cross steel upright posts 11 and the FRP sleeve 9, wherein the FRP sleeve 9 is arranged between two adjacent webs of each cross steel upright post 11, and through holes on straight side plates of the FRP sleeve 9 are in one-to-one correspondence with through holes on webs of the cross steel upright posts 11;
The FRP sleeve 9 and the cross-shaped steel upright post 11 are connected through epoxy resin solidification, and the FRP sleeve and the cross-shaped steel upright post are fixed to form a core mold;
the fiber composite material is wound on the outer surface of the core mold to form a winding fiber layer 8 outside the core mold.
The preparation process of the winding fiber layer 8 comprises the steps of directly impregnating a fiber composite material with resin under the action of tension, continuously winding the impregnated fiber composite material on the outer surface of a core mold according to a wet winding forming process, wherein the winding layer number is at least four, the winding angle of each layer of fiber composite material is 75 degrees, 60 degrees, 45 degrees and 30 degrees in sequence from inside to outside, and heating and curing after winding is finished to obtain the winding fiber layer 8 arranged on the outer side of the core mold, and when the winding layer number is more than four, the winding angle of each layer of fiber composite material can be circulated according to 75 degrees, 60 degrees, 45 degrees and 30 degrees. The winding angle is the included angle between the fiber composite material and the axis of the core mold, when the winding angle is 30 degrees, the winding direction of the fiber composite material approaches to the axis direction of the core mold, which is favorable for improving the axial strength of the core mold, and when the winding angle is 75 degrees, the winding direction of the fiber composite material approaches to the radial direction of the core mold, which is favorable for improving the radial strength of the core mold.
The fiber in the fiber composite material is any one of carbon fiber, glass fiber, basalt fiber and hybrid fiber.
The FRP sleeve 9 is manufactured by preparing fiber yarns from fiber reinforced composite materials, soaking the fiber yarns in resin, and finally preparing the FRP sleeve 9 through an integral pultrusion process;
The resin for impregnation is any one of unsaturated resin, vinyl resin, epoxy resin and phenolic resin, and the fiber material in the fiber reinforced composite material is any one of carbon fiber, glass fiber, basalt fiber and hybrid fiber.
Referring to fig. 6, a construction method of the FRP-steel honeycomb web photovoltaic pile foundation of the solidified soft soil bearing layer is implemented based on the FRP-steel honeycomb web photovoltaic pile foundation of the solidified soft soil bearing layer, and comprises the following steps:
S1, determining pile foundation burial depth, performing pile position calibration, cleaning sundries, leveling and preliminarily compacting the land, paving facility work sites, and particularly, performing accurate pile position calibration by adopting equipment such as a total station, a GPS (global positioning system) and the like.
S2, prospecting geological conditions, determining a construction scheme, and preparing a soft soil curing material;
The preparation method of the soft soil curing material comprises the following steps:
a1, according to geological survey results and construction requirements, adjusting the proportions of granulated blast furnace slag, carbide slag, phosphogypsum, straw fibers, alkali-activated agent and water, and determining the proportions of the materials so as to meet the construction requirements;
Specifically, the material is preferably prepared from 15% of granulated blast furnace slag, 10% of fly ash, 5% of carbide slag, 8% of phosphogypsum, 1% of straw fiber, 0.6% of alkali-activator and 10% of water;
a2, adding granulated blast furnace slag, carbide slag, phosphogypsum, straw fibers and water into a stirrer according to a proportion, and stirring and mixing to obtain a flow molding mixture;
A3, after the flow molding mixture is uniformly stirred, adding an alkali excitant into the stirrer, continuously stirring by the stirrer, and fully and uniformly stirring the flow molding mixture and the alkali excitant to obtain a soft soil curing material;
specifically, the alkali-activated agent consists of 25% of silica fume, 40% of sodium hydroxide, 34% of water and 1% of styrene-acrylic emulsion according to mass percent.
S3, determining a soft soil area to be grouted according to a construction scheme, injecting soft soil curing materials into soft soil in a required range by grouting equipment, curing for 7d to 28d to form a cured soft soil bearing layer 3, detecting soil strength after curing is finished, and ensuring that the unconfined compressive strength of the cured soft soil bearing layer 3 is not less than 2.5MPa;
the concrete construction method of the solidified soft soil bearing layer 3 comprises the following steps:
b1, arranging grouting holes according to soft soil conditions and calibrated pile positions, drilling holes in the grouting holes by using a drilling machine or a hand drill, drilling holes to a required depth to obtain grouting holes, and detecting geological conditions;
b2, grouting is carried out by grouting equipment, the grouting equipment comprises a grouting injection pipe and a grouting pump 1, grouting through holes are formed in the pipe wall, close to the bottom end, of the grouting injection pipe, the bottom end of the grouting injection pipe 2 is inserted into the grouting holes during grouting, and the top end of the grouting injection pipe 2 is connected with the grouting pump 1;
B3, continuously injecting soft soil curing materials into soft soil in a segmented manner through a grouting pump 1 and a grouting injection pipe 2;
specifically, the soft soil curing material is injected into the soft soil layer through the grouting injection pipe 2 by using the grouting pump 1, the soft soil curing material penetrates into soil layer pores, the soft soil curing material is continuously pressed once and cannot be interrupted, and the grouting is preferably started from thin slurry and gradually thickened. The grouting sequence is generally that the grouting pipe 2 is sunk into the whole depth for one time, grouting is continuously carried out from bottom to top in a segmentation way, and pipe drawing is carried out in a segmentation way until an orifice is reached, specifically, the grouting pipe 2 is inserted into a grouting hole for a certain depth, the grouting pipe 2 is continuously grouting into the grouting hole during grouting, after each grouting time, the grouting pipe 2 is lifted for a certain distance, the grouting is not interrupted in the lifting process until the bottom end of the grouting pipe 2 is lifted to the orifice.
And B4, slowly pulling out the grouting injection tube 2 after grouting is completed, and sealing a grouting orifice;
and B5, curing and monitoring are carried out to ensure that the curing effect of the soft soil meets the requirement.
S4, before the strength requirement of the soft soil bearing layer 3 to be solidified is met, adopting a driving method or a static pressure method to construct the FRP-steel honeycomb web photovoltaic pile foundation 4;
Specifically, when the static pressure method is used for construction, the pile driving equipment can adopt a static pile pressing machine, and when the driving method is used for construction, the pile driving equipment can adopt a vibrating hammer pile driving machine.
When the driving method is adopted, pile driving equipment, such as a vibrating hammer pile driver, is used for hammering the pile foundation with low energy, low stroke or empty hammer, continuous normal hammering is carried out after the fact that the penetration direction of the pile body is not abnormal is confirmed, after the pile bottom reaches the solidified soft soil bearing layer 3, the pile top is ensured to be still 1.5m above the ground surface, and after the pile foundation construction is completed, the strength and stability of each pile foundation are tested.
S5, after the construction of the FRP-steel honeycomb web photovoltaic pile foundation 4 is completed, sleeving a hoop 5 at the top of the pile foundation, and fastening the hoop 5 at a required position.
S6, installing a photovoltaic bracket 6 and a photovoltaic plate 7 on the anchor ear 5 to finish pile foundation construction.
The foregoing detailed description of the embodiments of the invention has been presented in conjunction with the drawings, but the invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, and yet fall within the scope of the invention.
Claims (10)
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