CN116446371A - Construction method for soft soil foundation treatment by utilizing solid waste cementing recycled coarse aggregate - Google Patents
Construction method for soft soil foundation treatment by utilizing solid waste cementing recycled coarse aggregate Download PDFInfo
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- CN116446371A CN116446371A CN202310101584.0A CN202310101584A CN116446371A CN 116446371 A CN116446371 A CN 116446371A CN 202310101584 A CN202310101584 A CN 202310101584A CN 116446371 A CN116446371 A CN 116446371A
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- grouting
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- 239000002910 solid waste Substances 0.000 title claims abstract description 56
- 239000002689 soil Substances 0.000 title claims abstract description 28
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 239000010881 fly ash Substances 0.000 claims abstract description 12
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- 239000011449 brick Substances 0.000 claims abstract description 11
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 11
- 239000010440 gypsum Substances 0.000 claims abstract description 11
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims abstract description 7
- 239000004575 stone Substances 0.000 claims description 33
- 238000012360 testing method Methods 0.000 claims description 25
- 238000013461 design Methods 0.000 claims description 19
- 238000007689 inspection Methods 0.000 claims description 16
- 239000002131 composite material Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 9
- 238000005056 compaction Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 7
- 230000003068 static effect Effects 0.000 claims description 6
- 238000012669 compression test Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000012797 qualification Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims 1
- 210000002435 tendon Anatomy 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 abstract description 8
- 230000005284 excitation Effects 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 229910052918 calcium silicate Inorganic materials 0.000 abstract description 3
- 239000000378 calcium silicate Substances 0.000 abstract description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052573 porcelain Inorganic materials 0.000 abstract description 3
- 238000004064 recycling Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0418—Wet materials, e.g. slurries
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
- C04B18/08—Flue dust, i.e. fly ash
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/12—Waste materials; Refuse from quarries, mining or the like
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- 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
- E02D33/00—Testing foundations or foundation structures
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
-
- 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
- E02D5/72—Pile shoes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Soil Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Agronomy & Crop Science (AREA)
- Combustion & Propulsion (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The application discloses a construction method for soft soil foundation treatment by utilizing solid waste cementing recycled coarse aggregate, which comprises the following steps ofThe upper part of the pile body is injected with novel salt mud to excite the fly ash cementing liquid through a porous grouting pipe. The cementing liquid takes salt mud industrial solid waste as main alkaline excitant, and is assisted by desulfurized gypsum, so as to treat active SiO in fly ash 2 Excitation is carried out to generate hydrated calcium silicate (H-C-S) with cementing capability, thereby realizing solid waste excitation and solid waste, and avoiding the problems of high energy consumption, high emission, environmental pollution and the like caused by using the traditional cementing material. The porous grouting pipe is used for grouting, so that the full contact between the cementing liquid and the recycled coarse aggregate during grouting is ensured, the reinforcing effect is ensured, and the resources are saved. The porous structure of mortar blocks, red bricks and broken porcelain in the recycled coarse aggregate can well adsorb cementing liquid, a cementing layer is formed in a pile top reinforcing area of the recycled aggregate pile, lateral bulging deformation near the pile top is limited, the bearing capacity of the pile body is further improved, pile top settlement is reduced, the effect is obvious, and the method is safe and environment-friendly.
Description
Technical Field
The application belongs to the technical field of soft soil foundation treatment, and particularly relates to a construction method for soft soil foundation treatment by utilizing solid waste cementing recycled coarse aggregate.
Background
When the natural foundation cannot meet the bearing and deformation requirements of the upper structure on the foundation, the foundation is usually required to be processed. The gravel pile can be used as a vertical reinforcement body to form a composite foundation with a natural foundation to jointly bear upper load, has the functions of compaction by vibration, displacement, drainage consolidation and the like, can effectively improve the bearing capacity of the foundation, accelerates consolidation, reduces post-construction sedimentation, avoids liquefaction phenomenon and the like, and has been widely applied to the field of foundation treatment.
However, the materials of broken stone materials in plain water network areas are easily available and limited by areas, broken stone resources in partial areas are scarce, and transportation cost is increased when broken stone is transferred from area to area. On the other hand, the gravel pile is a discrete material pile, the pile body bearing capacity is dependent on lateral constraint force which can be provided by surrounding soil of the pile, and when the surrounding soil of the pile is low in strength, excessive bulge deformation is easy to occur at the top of the gravel pile, so that the whole composite foundation is damaged. In order to improve the mechanical properties of the gravel pile, the existing technical method for reinforcing the gravel pile in engineering has a post grouting method, mainly adopts cement, lime, gelled polymer materials and the like for grouting treatment, and has the problems of high energy consumption, high emission, environmental pollution and the like although a better reinforcing effect can be obtained, which is contrary to the economic and social construction concepts of energy conservation, emission reduction, low carbon and environmental protection which are currently being greatly promoted in China.
Disclosure of Invention
The application discloses a construction method for carrying out soft soil foundation treatment by utilizing solid waste cementing recycled coarse aggregate, which can solve the technical problems of high energy consumption, high emission, environmental pollution and the like of reinforced gravel piles in the existing engineering.
In order to solve the technical problems, the application provides the following technical scheme:
a construction method for carrying out soft soil foundation treatment by utilizing solid waste cementing recycled coarse aggregate comprises the following steps:
step one, selecting a solid waste cementing recycled coarse aggregate pile filling material:
(1) The proportion of solid waste components is designed;
performing a crushing value test on the recycled coarse aggregate, and determining the content of each component in the solid waste of the building by taking the crushing value as a control standard;
(2) Grading design;
adopting stone sand ratio indexes proposed based on a particle stacking theory to carry out trial grading design and control, and determining the optimal grading of the solid waste cementing recycled coarse aggregate pile filling material;
step two, preparing solid waste cementing liquid;
mixing fly ash, salt mud and desulfurized gypsum according to a certain proportion to prepare a cementing material, and then mixing the cementing material with water to prepare solid waste cementing liquid;
thirdly, constructing a solid waste cementing recycled coarse aggregate pile;
(1) Assembling a immersed tube, a vibrating head and a immersed tube stone pile breaker;
(2) Starting the vibrating head to vibrate downwards, and stopping vibrating sinking when the bottom end of the immersed tube reaches a set reinforcement depth;
(3) Adding the recycled coarse aggregate in batches through a charging port on the immersed tube;
(4) Filling the regenerated coarse aggregate from the immersed tube, measuring whether the pile top surface of the regenerated coarse aggregate meets the grouting height requirement from the ground, when the measurement result is exactly equal to the grouting height, placing a grouting tube in the middle, and fixedly connecting the grouting tube with the immersed tube;
(5) Filling recycled coarse aggregate into an annular area between the immersed tube and the grouting tube, compacting the recycled coarse aggregate in layers, and filling the recycled coarse aggregate to the ground height;
(6) Grouting is started, and the injection rate is controlled in a certain range;
(7) After the grouting task is completed, the immersed tube and the grouting tube are pulled out for cleaning;
and fourthly, detecting the quality of the recycled aggregate pile of the rib hoop.
Optionally, in the first step, the crushing value is controlled to be 15-20%, and each component comprises crushed stone, mortar blocks, red brick blocks and other materials, wherein the content of each component is 68%, 25%, 4% and 3% respectively.
Alternatively, in step one, the stone to sand ratio is determined to be 1.8 by the indoor uniaxial load compression test.
Optionally, in the second step, the fly ash, the salt mud and the desulfurized gypsum are mixed according to the proportion of 70:17:13 to prepare a cementing material, and the ratio of water to the cementing material is 0.67.
Optionally, in the third step, a plurality of valve pile shoes are installed on the outer side of the lower end of the immersed tube, the valves of the valve pile shoes are fixed through bearings welded on the outer side of the bottom end of the immersed tube, the immersed tube can be folded into a cone when sinking, and the immersed tube can be automatically opened to facilitate filling of broken stones when pulling out the immersed tube.
Optionally, in the third step, a flange is arranged at the upper end of the immersed tube, and the flange is riveted with a vibrating head or a grouting tube of the vibrating immersed tube machine through bolts.
Optionally, in the third step, the length of the grouting pipe is 3000mm, the outer diameter is 30mm, and the wall thickness is 5mm; holes are arranged on the pipe wall of the grouting pipe, and the holes are arranged in the range of 0mm to 2000mm in height of the grouting pipe; eight rows of holes are arranged on the pipe wall of the grouting pipe at equal intervals, each row of holes are distributed along the grouting pipe, and the interval between every two adjacent rows of holes in each row of holes is 50mm.
Optionally, in the third step, the spraying rate is 80-150 kg/min.
Optionally, in the third step, the tube drawing speed of the immersed tube is 2m/min.
Optionally, in the fourth step, the quality detection of the recycled aggregate pile of the rib hoop includes:
treating the foundation by using the solid waste cementing recycled coarse aggregate piles, checking compaction quality of piles and soil between piles, and taking the design requirement as a qualification;
the detection position of the soil quality between piles is at the center of a triangle or square;
the composite foundation load test is carried out, the number of test piles is tested according to the design frequency, but the number of test piles is not less than 3, and when the total range is not more than 30% of the average value, the average value can be taken as the standard value of the bearing capacity of the composite foundation;
the inspection quantity of the solid waste cementing recycled coarse aggregate piles is not less than 2% of the total pile holes, and if the inspection result shows that piles accounting for 10% of the total inspection quantity do not meet the design requirement, piles or other measures are taken;
adopting a static sounding method to test the compactness of the pile body and the reinforcement effect of soil between piles;
and carrying out load test of the composite foundation by adopting a proper load plate.
The application has the advantages that:
1. the recycled coarse aggregate such as brick-concrete construction waste replaces the natural crushed stone of the traditional crushed stone pile method, thereby realizing the recycling of the solid waste of the building, relieving the construction embarrassment of insufficient natural crushed stone resources in plain water network areas, and meeting the requirements of green recycling and sustainable development of the resources of the country under the 'double carbon' background.
2. The cementing liquid takes salt mud industrial solid waste as main alkaline excitant, and is assisted by desulfurized gypsum, so as to treat active SiO in fly ash 2 Excitation is carried out to generateThe hydrated calcium silicate (H-C-S) with cementing capability realizes the excitation of solid waste and solid waste, and avoids the problems of high energy consumption, high emission, environmental pollution and the like caused by using the traditional cementing material.
3. The porous grouting pipe is used for grouting, so that the full contact between the cementing liquid and the recycled coarse aggregate during grouting is ensured, the reinforcing effect is ensured, and the resources are saved.
4. The porous structure of mortar blocks, red bricks and broken porcelain in the recycled coarse aggregate can well adsorb cementing liquid, a cementing layer is formed in a pile top reinforcing area of the recycled aggregate pile, lateral bulging deformation near the pile top is limited, the bearing capacity of the pile body is further improved, pile top settlement is reduced, the effect is obvious, and the method is safe and environment-friendly.
Drawings
FIG. 1 is a schematic view of a pile tube provided;
FIG. 2 is a schematic illustration of a provided grouting pipe;
FIG. 3 is an enlarged schematic view of portion A of FIG. 2;
FIG. 4 is a plot of bias stress versus axial strain for recycled aggregate with a stone to sand ratio of 1.8;
FIG. 5 is a molar coulomb envelope with a stone to sand ratio of 1.8.
Wherein: 1. sinking the pipe; 2. a plurality of valve pile shoes; 3. grouting pipe; 4. an eyelet.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged, as appropriate, such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein, and that the objects identified by "first," "second," etc. are generally of a type and not limited to the number of objects, e.g., the first object may be one or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
Referring to fig. 1 to 3, the application provides a construction method for soft soil foundation treatment by using solid waste cementing recycled coarse aggregate, comprising the following steps:
step one, selecting a solid waste cementing recycled coarse aggregate pile filling material:
(1) The proportion of solid waste components is designed;
performing a crushing value test on the recycled coarse aggregate, and determining the content of each component in the solid waste of the building by taking the crushing value as a control standard;
(2) Grading design;
adopting stone sand ratio indexes proposed based on a particle stacking theory to carry out trial grading design and control, and determining the optimal grading of the solid waste cementing recycled coarse aggregate pile filling material;
step two, preparing solid waste cementing liquid;
mixing fly ash, salt mud and desulfurized gypsum according to a certain proportion to prepare a cementing material, and then mixing the cementing material with water to prepare solid waste cementing liquid;
thirdly, constructing a solid waste cementing recycled coarse aggregate pile;
(1) Assembling a immersed tube 1, a vibrating head and a immersed tube gravel pile machine;
(2) Starting the vibrating head to vibrate downwards, and stopping vibrating sinking when the bottom end of the immersed tube 1 reaches a set reinforcement depth;
(3) Adding the recycled coarse aggregate in batches through a charging port on the immersed tube 1;
(4) Filling the regenerated coarse aggregate into the immersed tube 1, measuring whether the pile top surface of the regenerated coarse aggregate meets the grouting height requirement from the ground, when the measurement result is exactly equal to the grouting height, placing the grouting tube 3 in the middle, and fixedly connecting the grouting tube 3 with the immersed tube 1;
(5) Filling recycled coarse aggregate into an annular area between the immersed tube 1 and the grouting tube 3, compacting the recycled coarse aggregate in layers, and filling the recycled coarse aggregate to the ground height;
(6) Grouting is started, and the injection rate is controlled to be 80-150 kg/min;
(7) After the grouting task is completed, the immersed tube 1 and the grouting tube 3 are pulled out at the speed of 2m/min for cleaning;
and fourthly, detecting the quality of the recycled aggregate pile of the rib hoop.
In the first step, the crushing value is controlled to be 15-20%, each component comprises broken stone, mortar blocks, red brick blocks and other materials, the content of each component is 68%, 25%, 4% and 3%, and the other materials comprise ceramic tiles, wood and the like.
The content of each component is determined by the following method:
preliminary stone breaking: and (3) mortar blocks: red brick: the other materials are 60 percent: 30%:5%:5%, initial crush value was measured. If the initial crushing value is larger than the target crushing value, increasing the proportion of broken stone of the test sample according to a certain gradient, and correspondingly reducing the contents of mortar blocks, red brick blocks and other materials; otherwise, the proportion of broken stone in the sample is reduced, the contents of mortar blocks, red bricks and other materials are correspondingly increased, crushing value tests are carried out again, and the contents of the broken stone, the mortar blocks, the red bricks and the other materials which are finally determined are 68%, 25%, 4% and 3% respectively.
Further, in step one, the stone to sand ratio was determined to be 1.8 by the indoor uniaxial load compression test.
In the second step, the fly ash, the salt mud and the desulfurized gypsum are mixed according to the proportion of 70:17:13 to prepare a cementing material, and the ratio of water to the cementing material is 0.67.
In the third step, a plurality of valve pile shoes 2 are arranged on the outer side of the lower end of the immersed tube 1, the valves of the valve pile shoes 2 are fixed through bearings welded on the outer side of the bottom end of the immersed tube 1, the immersed tube 1 can be folded into a cone when sinking, and the cone can be automatically opened during tube drawing so as to facilitate filling of broken stones.
The upper end of the immersed tube 1 is provided with a flange (not shown) which is riveted with a vibrating head or a grouting tube of a vibrating immersed tube machine through bolts.
The length of the grouting pipe 3 is 3000mm, the outer diameter is 30mm, and the wall thickness is 5mm; holes 4 are arranged on the pipe wall of the grouting pipe 3, and the holes 4 are arranged in the range of 0mm to 2000mm in height of the grouting pipe 3; eight rows of holes 4 are arranged on the pipe wall of the grouting pipe 3 at equal intervals, each row of holes 4 are axially distributed along the grouting pipe 3, and the interval between every two adjacent rows of holes 4 in each row of holes 4 is 50mm.
In the fourth step, the quality detection of the recycled aggregate pile of the rib hoop comprises the following steps:
treating the foundation by using the solid waste cementing recycled coarse aggregate pile, checking compaction quality of the pile and soil between piles by adopting methods such as standard penetration, static force or dynamic sounding, and the like, and taking the design requirement as a qualification;
the detection position of the soil quality between piles is at the center of a triangle or square;
the composite foundation load test is carried out, the number of test piles is tested according to the design frequency, but the number of test piles is not less than 3, and when the total range is not more than 30% of the average value, the average value can be taken as the standard value of the bearing capacity of the composite foundation;
the inspection quantity of the solid waste cementing recycled coarse aggregate piles is not less than 2% of the total pile holes, and if the inspection result shows that piles accounting for 10% of the total inspection quantity do not meet the design requirement, piles or other measures are taken;
adopting a static sounding method to test the compactness of the pile body and the reinforcement effect of soil between piles;
and carrying out load test of the composite foundation by adopting a proper load plate.
The construction of the solid waste cementing recycled coarse aggregate pile is finished, and the quality inspection is carried out at certain intervals. The saturated cohesive soil is carried out after the pore water pressure is basically dissipated, the interval time is preferably 1-2 weeks, and the other soil can be 3-5 days after the construction is finished.
The following describes in detail a construction method for soft soil foundation treatment using the solid waste cemented recycled coarse aggregate provided in the embodiment of the present application through specific example 1 and its application scenario.
Example 1
The construction method for carrying out soft soil foundation treatment by utilizing solid waste cementing recycled coarse aggregate provided by the embodiment 1 of the application comprises the following steps:
step one, selecting a solid waste cementing recycled coarse aggregate pile filling material;
the materials used in the embodiment are recycled aggregate obtained by crushing and screening demolished waste at a construction site in a long-time sandy city. According to 15-20% of the control standard of the crushing value of the recycled coarse aggregate, the contents of the components of broken stone, mortar blocks, red brick blocks and other materials (ceramic tiles, wood and the like) in the building solid waste are determined to be 68.49%, 25.75%, 3.88% and 1.88% respectively.
And (3) adopting stone sand ratio indexes based on a particle stacking theory to carry out trial grading design and control, and determining the optimal grading of the solid waste cementing recycled coarse aggregate pile filling material through an indoor uniaxial loading compression test. The optimum grading of the recycled coarse aggregate is determined according to the uniaxial load compression test results shown in detail in fig. 4, 5 and table 1 as shown in table 2.
TABLE 1
| Stone to sand ratio | 1.0 | 1.6 | 1.8 | 2.0 | 2.5 |
| Friction angle/° | 30.2 | 39.4 | 42.4 | 43.8 | 45.7 |
TABLE 2
| Particle size/mm | ≤20 | ≤10 | ≤5 | ≤2 | ≤1 | ≤0.5 |
| Percentage by weight | 100％ | 40％ | 20％ | 10％ | 5％ | 0％ |
Step two: preparing solid waste cementing liquid;
the cementing material in the solid waste cementing liquid is prepared by mixing fly ash, salt mud and desulfurized gypsum according to the proportion of 70:17:13, and the water-cement ratio is 0.67. The physicochemical properties of the fly ash, the salt mud and the desulfurized gypsum industrial waste residues adopted in the embodiment are shown in tables 3, 4 and 5 respectively.
TABLE 3 Table 3
TABLE 4 Table 4
TABLE 5
Thirdly, constructing a solid waste cementing recycled coarse aggregate pile by the following steps:
(1) Assembling a immersed tube, a vibrating head and a immersed tube stone pile breaker;
(2) Starting the vibrating head to vibrate downwards, and stopping vibrating sinking when the bottom end of the immersed tube reaches a set reinforcement depth;
(3) Adding the regenerated coarse aggregate in batches through a charging port;
(4) Filling recycled coarse aggregate from the immersed tube, measuring whether the pile top surface of the recycled coarse aggregate is 2m away from the ground, and when the measurement result is exactly equal to 2m, placing a grouting tube in the middle and fixedly connecting the grouting tube with the immersed tube;
(5) Filling recycled coarse aggregate into an annular area between the immersed tube and the grouting tube, compacting the recycled coarse aggregate in layers, and filling the recycled coarse aggregate to the ground height;
(6) Grouting is started, and the injection rate is controlled to be 80-150 kg/min;
(7) After the grouting task is completed, the immersed tube and the grouting tube are pulled out at a speed of about 2m/min, and the immersed tube and the grouting tube are cleaned.
Fourthly, detecting the quality of the solid waste cementing recycled coarse aggregate pile:
and after the construction of the gravel pile is finished, carrying out quality inspection at certain intervals. The saturated clay is carried out after the pore water pressure is basically dissipated, the interval time is preferably 1-2 weeks, and the other soil can be 3-5 days after the construction is finished. The gravel pile is used for treating the foundation, and the compaction quality of piles and soil between piles is checked by adopting methods such as standard penetration, static force or dynamic sounding and the like, and the foundation is qualified by not less than the design requirement. The detection position of soil quality among piles is in the center of a triangle or square. The composite foundation load test is carried out, the number of test piles is tested according to the design frequency, but the number of test piles is not less than 3, and when the minimum is not more than 30% of the average value, the average value can be taken as the standard value of the bearing capacity of the composite foundation. And (3) the checking quantity of the gravel piles is not less than 2% of the total pile holes, and if the checking result shows that piles accounting for 10% of the total checking quantity do not meet the design requirement, adding piles or other measures are adopted. And (5) checking the compactness of the pile body and the reinforcement effect of soil between piles by adopting a static sounding method. And carrying out load test of the composite foundation by adopting a proper load plate. The allowable deviation of the gravel pile and the pile depth and pile diameter requirements are shown in the following table 6:
TABLE 6
| Inspection item | Quality standard | Inspection method |
| Pile body is vertical | ≤/100 | Appearance inspection observation pile frame and pile pipe verticality |
| Pile position | ≤D/2 | Detecting maximum values in two directions of x and y axes |
| Filling quantity | Meets the filling quantity per meter | Checking construction log and borehole checking |
| Standard penetration test | N≥10 | Borehole inspection |
| Pile deep compaction method | ≤100mm | Checking construction log or borehole checking |
| Hammer method | ≤300mm | / |
| Pile diameter compaction method | -20mm | Ruler quantity inspection |
The application has the advantages that:
1. the recycled coarse aggregate such as brick-concrete construction waste replaces the natural crushed stone of the traditional crushed stone pile method, thereby realizing the recycling of the solid waste of the building, relieving the construction embarrassment of insufficient natural crushed stone resources in plain water network areas, and meeting the requirements of green recycling and sustainable development of the resources of the country under the 'double carbon' background.
2. The cementing liquid takes salt mud industrial solid waste as main alkaline excitant, and is assisted by desulfurized gypsum, so as to treat active SiO in fly ash 2 Excitation is carried out to generate hydrated calcium silicate (H-C-S) with cementing capability, thereby realizing solid waste excitation and solid waste, and avoiding the problems of high energy consumption, high emission, environmental pollution and the like caused by using the traditional cementing material.
3. The porous grouting pipe is used for grouting, so that the full contact between the cementing liquid and the recycled coarse aggregate during grouting is ensured, the reinforcing effect is ensured, and the resources are saved.
4. The porous structure of mortar blocks, red bricks and broken porcelain in the recycled coarse aggregate can well adsorb cementing liquid, a cementing layer is formed in a pile top reinforcing area of the recycled aggregate pile, lateral bulging deformation near the pile top is limited, the bearing capacity of the pile body is further improved, pile top settlement is reduced, the effect is obvious, and the method is safe and environment-friendly.
The embodiments of the present application have been described above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are also within the protection of the present application.
Claims (10)
1. The construction method for carrying out soft soil foundation treatment by utilizing the solid waste cementing recycled coarse aggregate is characterized by comprising the following steps:
step one, selecting a solid waste cementing recycled coarse aggregate pile filling material:
(1) The proportion of solid waste components is designed;
performing a crushing value test on the recycled coarse aggregate, and determining the content of each component in the solid waste of the building by taking the crushing value as a control standard;
(2) Grading design;
adopting stone sand ratio indexes proposed based on a particle stacking theory to carry out trial grading design and control, and determining the optimal grading of the solid waste cementing recycled coarse aggregate pile filling material;
step two, preparing solid waste cementing liquid;
mixing fly ash, salt mud and desulfurized gypsum according to a certain proportion to prepare a cementing material, and then mixing the cementing material with water to prepare solid waste cementing liquid;
thirdly, constructing a solid waste cementing recycled coarse aggregate pile;
(1) Assembling a immersed tube, a vibrating head and a immersed tube stone pile breaker;
(2) Starting the vibrating head to vibrate downwards, and stopping vibrating sinking when the bottom end of the immersed tube reaches a set reinforcement depth;
(3) Adding the recycled coarse aggregate in batches through a charging port on the immersed tube;
(4) Filling the regenerated coarse aggregate from the immersed tube, measuring whether the pile top surface of the regenerated coarse aggregate meets the grouting height requirement from the ground, when the measurement result is exactly equal to the grouting height, placing a grouting tube in the middle, and fixedly connecting the grouting tube with the immersed tube;
(5) Filling recycled coarse aggregate into an annular area between the immersed tube and the grouting tube, compacting the recycled coarse aggregate in layers, and filling the recycled coarse aggregate to the ground height;
(6) Grouting is started, and the injection rate is controlled in a certain range;
(7) After the grouting task is completed, the immersed tube and the grouting tube are pulled out for cleaning;
and fourthly, detecting the quality of the recycled aggregate pile of the rib hoop.
2. The method according to claim 1, wherein in the first step, the crushing value is controlled to 15-20%, and each component comprises crushed stone, mortar block, red brick block and other materials, and the contents are 68%, 25%, 4% and 3%, respectively.
3. The method of claim 1, wherein in step one, the stone to sand ratio is determined to be 1.8 by an indoor uniaxial load compression test.
4. The method of claim 1, wherein in the second step, the fly ash, the salt slurry and the desulfurized gypsum are mixed in a ratio of 70:17:13 to form a cementing material, and the ratio of water to the cementing material is 0.67.
5. The method of claim 1, wherein in the third step, a plurality of valve pile shoes are arranged on the outer side of the lower end of the immersed tube, the valves of the valve pile shoes are fixed through bearings welded on the outer side of the bottom end of the immersed tube, the immersed tube can be folded into a cone when sinking, and the immersed tube can be automatically opened for filling broken stone when pulling out the immersed tube.
6. The method according to claim 1, wherein in the third step, a flange is provided at the upper end of the immersed tube, and the flange is riveted with a vibrating head of a vibrating immersed tube machine or a grouting tube by bolts.
7. The method according to claim 1, wherein in the third step, the grouting pipe has a length of 3000mm, an outer diameter of 30mm and a wall thickness of 5mm; holes are arranged on the pipe wall of the grouting pipe, and the holes are arranged in the range of 0mm to 2000mm in height of the grouting pipe; eight rows of holes are arranged on the pipe wall of the grouting pipe at equal intervals, each row of holes are distributed along the grouting pipe, and the interval between every two adjacent rows of holes in each row of holes is 50mm.
8. The method according to claim 1, wherein in the third step, the spraying rate is 80-150 kg/min.
9. The method according to claim 1, wherein in the third step, the tube drawing speed of the immersed tube is 2m/min.
10. The method according to claim 1, wherein in the fourth step, the quality detection of the recycled aggregate pile of the tendons and the hoops comprises:
treating the foundation by using the solid waste cementing recycled coarse aggregate piles, checking compaction quality of piles and soil between piles, and taking the design requirement as a qualification;
the detection position of the soil quality between piles is at the center of a triangle or square;
the composite foundation load test is carried out, the number of test piles is tested according to the design frequency, but the number of test piles is not less than 3, and when the total range is not more than 30% of the average value, the average value can be taken as the standard value of the bearing capacity of the composite foundation;
the inspection quantity of the solid waste cementing recycled coarse aggregate piles is not less than 2% of the total pile holes, and if the inspection result shows that piles accounting for 10% of the total inspection quantity do not meet the design requirement, piles or other measures are taken;
adopting a static sounding method to test the compactness of the pile body and the reinforcement effect of soil between piles;
and carrying out load test of the composite foundation by adopting a proper load plate.
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