CN112227342A - Steel slag-doped composite foundation structure and construction method thereof - Google Patents
Steel slag-doped composite foundation structure and construction method thereof Download PDFInfo
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- CN112227342A CN112227342A CN202011210842.1A CN202011210842A CN112227342A CN 112227342 A CN112227342 A CN 112227342A CN 202011210842 A CN202011210842 A CN 202011210842A CN 112227342 A CN112227342 A CN 112227342A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- 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
- C04B28/02—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 hydraulic cements other than calcium sulfates
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/005—Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
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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
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
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- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0084—Geogrids
Abstract
The invention discloses a steel slag-doped composite foundation structure and a construction method thereof, wherein the steel slag-doped composite foundation structure comprises the following steps: the gravel cushion layer is laid on the foundation, and the foundation comprises a soft soil layer and a bearing layer; the steel slag bedding layer is laid on the gravel bedding layer and sequentially comprises a lower steel slag bedding layer, a geogrid and an upper steel slag bedding layer from bottom to top; the steel slag concrete piles are arranged on a soft soil layer of the foundation at intervals, the upper end of each steel slag concrete pile penetrates through the gravel cushion layer and extends into the steel slag mattress cushion layer, and the lower end of each steel slag concrete pile penetrates through the soft soil layer and extends into a supporting layer at the bottom of the soft soil layer; also comprises a construction method thereof. By adopting the composite foundation structure and the construction method thereof, the sandstone resources can be saved, the utilization rate of the steel slag is improved, and the strength and the rigidity of the composite foundation structure are improved, so that the composite foundation structure has stronger transverse reinforcement effect.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering foundation treatment, in particular to a steel slag-doped composite foundation structure and a construction method thereof.
Background
With the continuous development of economy, the demands of people on materials and culture are continuously improved, the construction activities of projects such as roads, railways, buildings and the like are more and more frequent, the construction of the projects needs a large amount of materials, particularly a large amount of sand stones, wherein the sand stones are the most extensive materials applied to the engineering construction and are expensive, and the annual demand of China on the sand stones is increased year by year, so that the sand stones are in an over-exploitation state. Due to the excessive exploitation of the sandstone, the sandstone market in China is in a hungry state at present, and many river channels cause problems of riverbed deformation, landscape destruction and the like due to the excessive exploitation of the sandstone. In order to alleviate the contradiction, the search of new sandstone substitute resources is more and more important, but most of solid waste resources such as steel slag cannot be fully utilized at present, and the utilization rate is low.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a steel slag-doped composite foundation structure and a construction method thereof, thereby overcoming the defects that the existing road, railway, building and other projects mainly use sand stones as raw materials, are expensive and over-mined, and the utilization rate of solid waste steel slag is high.
In order to achieve the above object, the present invention provides a steel slag-doped composite foundation structure, comprising: the gravel cushion layer is laid on a foundation, and the foundation comprises a soft soil layer and a bearing layer; the steel slag bedding layer is laid on the gravel bedding layer and sequentially comprises a lower steel slag bedding layer, a geogrid and an upper steel slag bedding layer from bottom to top; and all the steel slag concrete piles are arranged on the soft soil layer of the foundation at intervals, the upper end of each steel slag concrete pile penetrates through the gravel cushion layer and extends into the steel slag mattress cushion layer, and the lower end of each steel slag concrete pile penetrates through the soft soil layer and extends into the supporting layer at the bottom of the soft soil layer.
Preferably, in the above technical scheme, the steel slag concrete pile comprises the following raw material components in parts by weight: 731-742 parts of steel slag coarse aggregate, 496-523 parts of steel slag fine aggregate, 388-409 parts of machine-made sand, 583-592 parts of natural macadam, 206-283 parts of cement, 170-183 parts of water and 3.08-4.25 parts of retarding water reducer; wherein the volume of the steel slag coarse aggregate is the same as that of the natural macadam, and the volume of the steel slag fine aggregate is the same as that of the machine-made sand.
Preferably, in the above technical scheme, the aging time of the steel slag coarse aggregate and the steel slag fine aggregate is more than or equal to 1 year, wherein the particle size of the steel slag fine aggregate is less than or equal to 4.75mm, the particle size of the steel slag coarse aggregate is 5-20 mm, the natural crushed stone is pebble, and the particle size of the natural crushed stone is 5-20 mm.
Preferably, in the above technical scheme, the diameter of each steel slag concrete pile is 500-700 mm, and the distance between two adjacent steel slag concrete piles is not less than 2 times of the diameter of the steel slag concrete.
Preferably, in the above technical scheme, the length of the upper end of each steel slag concrete pile extending into the steel slag mattress layer is 30-50 mm, and the length of the lower end of each steel slag concrete pile extending into the bearing layer is 500-1000 mm.
Preferably, in the above technical scheme, the gravel cushion layer is composed of steel slag sand, the particle size of the steel slag sand is 0.075-4.75 mm, and the thickness of the gravel cushion layer is 15-20 mm.
Preferably, in the technical scheme, the lower steel slag mattress layer and the upper steel slag mattress layer are both steel slag aggregates which are aged for more than or equal to 1 year and are not sieved, the particle size of the steel slag aggregates is less than or equal to 20mm, the non-uniform coefficient is more than 5, and the curvature coefficient is 1-3; wherein the thickness of the steel slag mattress layer is 300-500 mm.
Preferably, in the above technical solution, the thickness of the upper steel slag mattress layer is equal to the thickness of the lower steel slag mattress layer.
Preferably, in the technical scheme, the tensile strength of the geogrid is more than or equal to 35KN/m, and the elongation is less than 13%.
A construction method of a steel slag-doped composite foundation structure comprises the following steps:
(1) surface treatment: cleaning and leveling the ground surface of the foundation;
(2) paving a working cushion layer: after the foundation is leveled, paving a working cushion layer on the foundation;
(3) laying the pile positions of the steel slag concrete piles: after the working cushion layer is paved, pile positions of all steel slag concrete piles are positioned on the working cushion layer in a mode of inserting reinforcing steel bars;
(4) constructing a steel slag concrete pile: adopting a long spiral drilling machine to construct steel slag concrete piles, moving the long spiral drilling machine to the pile position of one steel slag concrete pile, enabling a drill rod of the long spiral drilling machine to vertically align at the center of the pile position, performing drilling operation, pulling out the drill rod while adopting a concrete pump to pump steel slag concrete into a drill hole through the drill rod after the drilling depth meets the requirement, constructing the steel slag concrete piles, and enabling the upper ends of the steel slag concrete piles to be higher than the designed elevation; repeating the operation until all the steel slag concrete piles are constructed;
(5) clearing soil among piles and cutting piles: after the steel slag concrete piles are maintained for 7 days, floating soil between the steel slag concrete piles is cleaned, the designed elevation of the steel slag concrete piles is marked, and then the part of the upper end of each steel slag concrete pile, which is higher than the designed elevation, is cut off by adopting a circular cutting process;
(6) paving a gravel cushion layer: after the soil removal and pile cutting among the steel slag concrete piles are finished, paving a gravel sand cushion layer on the foundation;
(7) paving a steel slag mattress layer: after the gravel cushion layer is paved, a steel slag mattress cushion layer is paved on the gravel cushion layer; when the steel slag mattress layer is paved, a lower steel slag mattress layer is paved, then the geogrid is paved, and finally an upper steel slag mattress layer is paved.
Compared with the prior art, the invention has the following beneficial effects:
1. the steel slag mattress layer and the steel slag concrete pile of the composite foundation structure both use the steel slag to replace the original sand stone, so that the price of raw materials can be reduced, the construction cost of engineering materials can be saved, the exploitation of the sand stone can be reduced, sand stone resources can be saved, the natural environment can be protected, and the utilization rate of the steel slag can be improved to a certain extent; the steel slag has certain activity, can be slowly hardened along with the lapse of time, and the occlusal force between the steel slag aggregate after hardening is strengthened, has certain tensile characteristic, and in addition the tensile effect of geogrid, can improve the rigidity of this composite foundation structure, has stronger horizontal reinforcing effect.
2. The construction method of the composite foundation structure is simple and convenient, and can improve the strength and rigidity of the foundation and reduce the foundation settlement.
Drawings
Fig. 1 is a schematic structural view of a steel slag-doped composite foundation structure according to the present invention.
Description of the main reference numerals:
1-steel slag mattress layer, 2-geogrid, 3-steel slag concrete pile, 4-gravel cushion layer, 5-soft soil layer and 6-bearing layer.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
The raw materials of the components used in the following examples are commercially available, wherein the steel slag coarse aggregate has a density of 3387kg/m3The density of the steel slag fine aggregate is 3389kg/m3The density of the machine-made sand is 2650kg/m3The density of the natural macadam is 2700kg/m3。
Example 1
Fig. 1 shows a schematic structural view of a steel slag-doped composite foundation structure according to a preferred embodiment of the present invention, which includes a gravel cushion layer 4, a steel slag mattress layer 1, and a plurality of steel slag concrete piles 3. Referring to fig. 1, a gravel pack 4 is laid on a foundation including a soft soil layer 5 and a bearing layer 6 to enhance a lateral drainage function of the foundation. The steel slag mattress layer 1 is laid on the gravel cushion layer 4, the steel slag mattress layer 1 sequentially comprises a lower steel slag mattress layer, a geogrid 2 and an upper steel slag mattress layer from bottom to top, the steel slag mattress layer 1 is laid on the gravel cushion layer, the geogrid 2 is laid in the steel slag mattress layer 1, the structural strength and the rigidity of the foundation can be improved, and the foundation settlement is reduced. All steel slag concrete piles 3 are arranged on a soft soil layer 5 of the foundation at intervals, the upper end of each steel slag concrete pile 3 penetrates through a gravel cushion layer 4 and extends into a steel slag mattress cushion layer 1, and the lower end of each steel slag concrete pile 3 penetrates through the soft soil layer 5 and extends into a bearing layer 6 at the bottom of the soft soil layer 5, so that the strength and the rigidity of the foundation are improved, and the foundation settlement is avoided. The steel slag mattress layer 1 and the steel slag concrete pile 3 adopting the composite foundation structure both use steel slag to replace the original sand stone, so that the price of raw materials can be reduced, the construction cost of engineering materials can be saved, the exploitation of the sand stone can be reduced, the sand stone resource can be saved, the natural environment can be protected, and the utilization rate of the steel slag can be improved to a certain extent; the steel slag has certain activity, can be slowly hardened along with the passage of time, the occluding force between the hardened steel slag aggregates is enhanced, the steel slag aggregates are mutually cemented and have certain tensile property, and the tensile effect of the geogrid 2 is added, so that the rigidity of the composite foundation structure can be improved.
Example 2
Referring to example 1, the steel slag-doped composite foundation structure in this example includes the following raw material components in parts by weight: 738 parts of steel slag coarse aggregate, 496 parts of steel slag fine aggregate, 388 parts of machine-made sand, 588 parts of natural gravel, 283 parts of cement, 170 parts of water and 4.25 parts of retarding water reducer, wherein the volume of the steel slag coarse aggregate is the same as that of the natural gravel, and the volume of the steel slag fine aggregate is the same as that of the machine-made sand. Wherein the aging time of the steel slag coarse aggregate and the steel slag fine aggregate is more than or equal to 1 year, the grain diameter of the steel slag fine aggregate is less than or equal to 4.75mm, the grain diameter of the steel slag coarse aggregate is 5-20 mm, the natural crushed stone is pebble, and the grain diameter of the natural crushed stone is 5-20 mm. The diameter of each steel slag concrete pile 3 is 500mm, the distance between two adjacent steel slag concrete piles 3 is 1000mm, the length of the upper end of each steel slag concrete pile 3 extending into the steel slag mattress layer 1 is 30-50 mm, and the length of the lower end of each steel slag concrete pile 3 extending into the supporting layer 6 is 500 mm. The gravel cushion layer 4 on the foundation consists of steel slag sand with the particle size of 0.075-4.75 mm, and the thickness of the gravel cushion layer 4 is 15-20 mm. Wherein the lower steel slag mattress layer and the upper steel slag mattress layer are both steel slag aggregates which have the grain size of less than or equal to 20mm, the aging time of more than or equal to 1 year and are not sieved, the non-uniformity coefficient of the steel slag aggregates is 11.2, and the curvature coefficient is 1.9; the thickness of the steel slag mattress layer 1 is 300mm, and the thickness of the upper steel slag mattress layer and the thickness of the lower steel slag mattress layer are both 150 mm. The geogrid 2 has a tensile strength of 45KN/m and an elongation of 8%.
Example 3
Referring to example 1, the steel slag-doped composite foundation structure in this example includes the following raw material components in parts by weight: 742 parts of steel slag coarse aggregate, 509 parts of steel slag fine aggregate, 399 parts of machine-made sand, 592 parts of natural crushed stone, 236 parts of cement, 175 parts of water and 3.55 parts of retarding water reducing agent, wherein the volume of the steel slag coarse aggregate is the same as that of the natural crushed stone, and the volume of the steel slag fine aggregate is the same as that of the machine-made sand. Wherein the aging time of the steel slag coarse aggregate and the steel slag fine aggregate is more than or equal to 1 year, the grain diameter of the steel slag fine aggregate is less than or equal to 4.75mm, the grain diameter of the steel slag coarse aggregate is 5-20 mm, the natural crushed stone is pebble, and the grain diameter of the natural crushed stone is 5-20 mm. The diameter of each steel slag concrete pile 3 is 600mm, the distance between two adjacent steel slag concrete piles 3 is 1750mm, the length of the upper end of each steel slag concrete pile 3 extending into the steel slag mattress layer 1 is 30-50 mm, and the length of the lower end of each steel slag concrete pile 3 extending into the supporting layer 6 is 750 mm. The gravel cushion layer 4 on the foundation consists of steel slag sand with the particle size of 0.075-4.75 mm, and the thickness of the gravel cushion layer 4 is 15-20 mm. Wherein the lower steel slag mattress layer and the upper steel slag mattress layer are both steel slag aggregates which have the grain size of less than or equal to 20mm, the aging time of more than or equal to 1 year and are not sieved, the non-uniformity coefficient of the steel slag aggregates is 13.2, and the curvature coefficient is 2.3; the thickness of the steel slag mattress layer 1 is 400mm, and the thickness of the upper steel slag mattress layer and the thickness of the lower steel slag mattress layer are both 200 mm. The geogrid 2 has a tensile strength of 43KN/m and an elongation of 7.5%.
Example 4
Referring to example 1, the steel slag-doped composite foundation structure in this example includes the following raw material components in parts by weight: 731 parts of steel slag coarse aggregate, 523 parts of steel slag fine aggregate, 409 parts of machine-made sand, 583 parts of natural crushed stone, 206 parts of cement, 183 parts of water and 3.08 parts of retarding water reducer, wherein the volume of the steel slag coarse aggregate is the same as that of the natural crushed stone, and the volume of the steel slag fine aggregate is the same as that of the machine-made sand. Wherein the aging time of the steel slag coarse aggregate and the steel slag fine aggregate is more than or equal to 1 year, the grain diameter of the steel slag fine aggregate is less than or equal to 4.75mm, the grain diameter of the steel slag coarse aggregate is 5-20 mm, the natural crushed stone is pebble, and the grain diameter of the natural crushed stone is 5-20 mm. The diameter of each steel slag concrete pile 3 is 700mm, the distance between every two adjacent steel slag concrete piles 3 is 2500mm, the length of the upper end of each steel slag concrete pile 3 extending into the steel slag mattress layer 1 is 30-50 mm, and the length of the lower end of each steel slag concrete pile 3 extending into the supporting layer 6 is 1000 mm. The gravel cushion layer 4 on the foundation consists of steel slag sand with the particle size of 0.075-4.75 mm, and the thickness of the gravel cushion layer 4 is 15-20 mm. Wherein the materials of the lower steel slag mattress layer and the upper steel slag mattress layer are steel slag aggregates which have the grain size of less than or equal to 20mm, the aging time of more than or equal to 1 year and are not sieved, the non-uniformity coefficient of the steel slag aggregates is 15.1, and the curvature coefficient is 2.1; the thickness of the steel slag mattress layer 1 is 500mm, and the thickness of the upper steel slag mattress layer and the thickness of the lower steel slag mattress layer are both 250 mm. The geogrid 2 has a tensile strength of 46KN/m and an elongation of 6%.
Example 5
The steel slag-doped composite foundation structure of the embodiments 2 to 4 is constructed by the following method, that is, the construction method of the steel slag-doped composite foundation structure of the embodiments 2, 3 or 4, specifically comprises the following operation steps:
(1) surface treatment: clearing up the obstacles such as weeds, branches and the like on the foundation and leveling the ground surface of the foundation.
(2) Paving a working cushion layer: after the foundation is leveled, paving a working cushion layer on the foundation; the working cushion is paved by adopting more than C groups of fillers, the particle size of the fillers of the working cushion is less than or equal to 30mm, the paving thickness of the working cushion is ensured to meet the bearing capacity requirement under the walking and construction load of construction machinery, and the thickness of the working cushion is generally 500-800 mm.
(3) Laying the pile position of the steel slag concrete pile 3: after the working cushion layer is paved, pile positions of all steel slag concrete piles are positioned on the working cushion layer in a mode of inserting reinforcing steel bars.
(4) Constructing a steel slag concrete pile 3: the method comprises the following steps of constructing steel slag concrete piles 3 by using a long spiral drilling machine, moving the long spiral drilling machine to the pile position of one steel slag concrete pile 3, enabling a drill rod of the long spiral drilling machine to be vertically aligned to the center of the pile position, performing drilling operation, pulling out the drill rod while pumping steel slag concrete into a drill hole through the drill rod by using a concrete pump after the drilling depth meets the requirement, constructing the steel slag concrete piles 3, enabling the upper ends of the steel slag concrete piles 3 to be higher than the designed elevation by more than 500mm, stopping the long spiral drilling machine after the construction of the steel slag concrete piles 3 is completed, and stopping the concrete pump to pump concrete to ensure that the concrete at the pile top is compact; this operation is repeated until all the steel slag concrete piles 3 are constructed. During the construction of the steel slag concrete pile 3, sampling and preparing mixture test blocks, preparing 2 groups of test blocks with the size of 150mm multiplied by 150mm per day by using each long screw rotary machine, and testing the compressive strength after curing for 7 days and 28 days under the conditions that the temperature range is 20 +/-2 ℃ and the humidity is 95%.
(5) Clearing soil among piles and cutting piles: after the steel slag concrete piles 3 are maintained for 7 days, floating soil between the steel slag concrete piles 3 is cleaned, the design elevation of the steel slag concrete piles 3 is marked, and then the part of the upper end of each steel slag concrete pile 3, which is higher than the design elevation, is cut off by adopting a circular cutting process.
(6) Paving a gravel cushion layer 4: after the soil cleaning and pile cutting among the steel slag concrete piles 3 are finished, a gravel sand cushion layer 4 is paved on the foundation.
(7) Paving a steel slag mattress layer 1: and after the gravel cushion layer 4 is paved, the steel slag mattress cushion layer 1 is paved on the gravel cushion layer 4. Firstly, paving a lower steel slag mattress layer, and then paving a geogrid 2, wherein the technical indexes of the geogrid 2 are strictly executed according to traffic engineering geosynthetic material geogrid (JT/T480-2002); and finally, paving an upper steel slag mattress layer on the geogrid 2. When an upper steel slag mattress layer and a lower steel slag mattress layer are paved, water is properly sprayed according to the dryness and wetness degree of materials so as to keep the optimal water content of the steel slag aggregate, a road roller is adopted for carrying out reciprocating rolling, the rolling times are determined by field tests, static pressure is firstly carried out before vibration rolling, the static pressure is not less than 2 times, the vibration rolling is not less than 3 times, the wheel span overlapping length of the road roller is not less than 500mm, and leveling is carried out after the rolling is qualified. When the geogrid 2 is laid, the main stress direction of the geogrid 2 is the axial direction vertical to the foundation; the geogrids 2 are connected through manual binding and lapping, the lapping width is larger than or equal to 100mm, the lapping parts of the geogrids 2 are connected in an inserting mode through No. 8 iron wires every 1000mm along the axis direction perpendicular to the foundation, and the geogrids 2 are fixed on the ground through U-shaped nails every 1500-2000 mm.
The steel slag concrete piles of examples 2 to 4 had the following composition ratios and strengths as shown in the following table:
the foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. A steel slag-doped composite foundation structure is characterized by comprising:
the gravel cushion layer is laid on a foundation, and the foundation comprises a soft soil layer and a bearing layer;
the steel slag bedding layer is laid on the gravel bedding layer and sequentially comprises a lower steel slag bedding layer, a geogrid and an upper steel slag bedding layer from bottom to top; and
the steel slag concrete piles are arranged on the soft soil layer of the foundation at intervals, the upper end of each steel slag concrete pile penetrates through the gravel cushion layer and extends into the steel slag mattress cushion layer, and the lower end of each steel slag concrete pile penetrates through the soft soil layer and extends into the supporting layer at the bottom of the soft soil layer.
2. The steel slag-doped composite foundation structure of claim 1, wherein the steel slag concrete pile comprises the following raw material components in parts by weight: 731-742 parts of steel slag coarse aggregate, 496-523 parts of steel slag fine aggregate, 388-409 parts of machine-made sand, 583-592 parts of natural macadam, 206-283 parts of cement, 170-183 parts of water and 3.08-4.25 parts of retarding water reducer; wherein the volume of the steel slag coarse aggregate is the same as that of the natural macadam, and the volume of the steel slag fine aggregate is the same as that of the machine-made sand.
3. The steel slag-doped composite foundation structure of claim 2, wherein the aging time of the steel slag coarse aggregate and the steel slag fine aggregate is more than or equal to 1 year, wherein the grain size of the steel slag fine aggregate is less than or equal to 4.75mm, the grain size of the steel slag coarse aggregate is 5-20 mm, the natural crushed stone is pebble, and the grain size of the natural crushed stone is 5-20 mm.
4. The steel slag-doped composite foundation structure of claim 1, wherein the diameter of each steel slag concrete pile is 500-700 mm, and the distance between two adjacent steel slag concrete piles is not less than 2 times of the diameter of the steel slag concrete.
5. The steel slag-doped composite foundation structure of claim 1, wherein the length of the upper end of each steel slag concrete pile extending into the steel slag mattress layer is 30-50 mm, and the length of the lower end of each steel slag concrete pile extending into the bearing layer is 500-1000 mm.
6. The steel slag-doped composite foundation structure of claim 1, wherein the gravel cushion layer is composed of steel slag sand, the particle size of the steel slag sand is 0.075-4.75 mm, and the thickness of the gravel cushion layer is 15-20 mm.
7. The steel slag-doped composite foundation structure of claim 1, wherein the lower steel slag mattress layer and the upper steel slag mattress layer are both steel slag aggregates aged for more than or equal to 1 year and not sieved, the particle size of the steel slag aggregates is less than or equal to 20mm, the non-uniformity coefficient is more than 5, and the curvature coefficient is 1-3; wherein the thickness of the steel slag mattress layer is 300-500 mm.
8. The steel slag-doped composite foundation structure of claim 1, wherein the thickness of the upper steel slag bedding layer is equal to the thickness of the lower steel slag bedding layer.
9. The steel slag-doped composite foundation structure of claim 1, wherein the geogrid has a tensile strength of not less than 35KN/m and an elongation of less than 13%.
10. A construction method of the steel-doped slag composite foundation structure as claimed in claim 1, characterized by comprising the following steps:
(1) surface treatment: cleaning and leveling the ground surface of the foundation;
(2) paving a working cushion layer: after the foundation is leveled, paving a working cushion layer on the foundation;
(3) laying the pile positions of the steel slag concrete piles: after the working cushion layer is paved, pile positions of all steel slag concrete piles are positioned on the working cushion layer in a mode of inserting reinforcing steel bars;
(4) constructing a steel slag concrete pile: adopting a long spiral drilling machine to construct steel slag concrete piles, moving the long spiral drilling machine to the pile position of one steel slag concrete pile, enabling a drill rod of the long spiral drilling machine to vertically align at the center of the pile position, performing drilling operation, pulling out the drill rod while adopting a concrete pump to pump steel slag concrete into a drill hole through the drill rod after the drilling depth meets the requirement, constructing the steel slag concrete piles, and enabling the upper ends of the steel slag concrete piles to be higher than the designed elevation; repeating the operation until all the steel slag concrete piles are constructed;
(5) clearing soil among piles and cutting piles: after the steel slag concrete piles are maintained for 7 days, floating soil between the steel slag concrete piles is cleaned, the designed elevation of the steel slag concrete piles is marked, and then the part of the upper end of each steel slag concrete pile, which is higher than the designed elevation, is cut off by adopting a circular cutting process;
(6) paving a gravel cushion layer: after the soil removal and pile cutting among the steel slag concrete piles are finished, paving a gravel sand cushion layer on the foundation;
(7) paving a steel slag mattress layer: after the gravel cushion layer is paved, a steel slag mattress cushion layer is paved on the gravel cushion layer; when the steel slag mattress layer is paved, a lower steel slag mattress layer is paved, then the geogrid is paved, and finally an upper steel slag mattress layer is paved.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011210842.1A CN112227342A (en) | 2020-11-03 | 2020-11-03 | Steel slag-doped composite foundation structure and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114319295A (en) * | 2021-12-09 | 2022-04-12 | 中交(昆明)建设有限公司 | Reverse construction method of high-pressure jet grouting pile composite foundation for soft soil stratum |
| CN114908760A (en) * | 2022-05-31 | 2022-08-16 | 山东建筑大学 | Three-dimensional reinforcement structure and method for near top surface of deep foundation pit of alluvial field road |
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2020
- 2020-11-03 CN CN202011210842.1A patent/CN112227342A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114319295A (en) * | 2021-12-09 | 2022-04-12 | 中交(昆明)建设有限公司 | Reverse construction method of high-pressure jet grouting pile composite foundation for soft soil stratum |
| CN114319295B (en) * | 2021-12-09 | 2023-10-24 | 中交(昆明)建设有限公司 | Reverse construction method of high-pressure jet grouting pile composite foundation for soft soil stratum |
| CN114908760A (en) * | 2022-05-31 | 2022-08-16 | 山东建筑大学 | Three-dimensional reinforcement structure and method for near top surface of deep foundation pit of alluvial field road |
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