CN118110154A - Multiple solid waste synergistic reinforcing soft foundation structure, mold and preparation method - Google Patents
Multiple solid waste synergistic reinforcing soft foundation structure, mold and preparation method Download PDFInfo
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- CN118110154A CN118110154A CN202410528021.4A CN202410528021A CN118110154A CN 118110154 A CN118110154 A CN 118110154A CN 202410528021 A CN202410528021 A CN 202410528021A CN 118110154 A CN118110154 A CN 118110154A
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Classifications
-
- 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
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of building foundation construction, and mainly provides a multi-solid waste synergistic reinforced soft foundation structure, a die and a preparation method. The multi-solid waste cooperative reinforcement soft foundation structure comprises a composite reinforcement pile and a reinforcement cushion layer module. The composite reinforced pile comprises a pile body and a first fiber reinforced outer wall, wherein conical pile tips and pile caps are respectively arranged at two ends of the pile body, the first fiber reinforced outer wall comprises a connecting layer and a reinforced pile wall, the connecting layer is coated on the pile body, reinforcing ribs which are arranged along the length direction of the pile body are buried in the connecting layer, and the reinforced pile wall is coated outside the connecting layer and is of a spiral structure. The reinforced cushion layer module comprises a second fiber reinforced outer wall and a pouring inner core, wherein the pouring inner core is filled in the second fiber reinforced outer wall, and the reinforced cushion layer module is arranged above the pile cap of the composite reinforced pile. The multi-solid-waste cooperative reinforcement soft foundation structure can overcome the technical defects of long construction period and poor bearing capacity and stability after reinforcement of the traditional foundation processing mode in the related technology.
Description
Technical Field
The invention belongs to the technical field of building foundation construction, and particularly relates to a multi-solid waste synergistic reinforced soft foundation structure, a die and a preparation method.
Background
Soft soil foundations are a common poor foundation with a natural porosity greater than or equal to 1.0 and a natural water content greater than a liquid limit, including silt, mucky soil (mucky clay silty soil), peat soil, and the like. Has the advantages of high natural water content, large natural pore ratio, high compressibility, low shear strength, small consolidation coefficient, long consolidation time high sensitivity, high disturbance, poor water permeability, complex layered distribution of soil layers, large physical and mechanical property difference among layers, and the like. The characteristics of low bearing capacity, easy deformation, poor stability and the like make the composite material a common challenge in constructional engineering.
In the related art, a soft soil foundation is reinforced, and a filling method and a pre-pressing method are generally adopted. The reclamation method is to excavate the weak soil layer in a certain range below the foundation bottom surface and then backfill the soft soil layer with a material with high strength, low compressibility and no corrosiveness. The purpose of this method is to increase the bearing capacity of the foundation and to reduce the amount of settlement. The pre-compaction is carried out by piling heavy objects on the foundation, or after a sand cushion layer is paved to form a film, air under the film is pumped out by utilizing a vacuum pump, so that a negative pressure environment is formed to discharge water in soil of the foundation, and the soil is solidified, so that the bearing capacity of the foundation is improved, and the settlement of a building is reduced.
The foundation reinforcement method in the related art can achieve a certain reinforcement effect, but needs to perform large-area excavation replacement on the surface of the soft soil foundation and filling other materials for pretreatment, so that the problems of long construction period and high cost exist, and the problems of foundation deformation and the like easily caused by construction errors are caused due to large-area working treatment on the surface layer of the soft soil foundation.
Disclosure of Invention
The embodiment of the invention provides a multi-solid waste synergistic reinforced soft foundation structure, a die and a preparation method, which can overcome the technical defects of long construction period and poor bearing capacity and stability after reinforcement of a traditional foundation processing mode in the related technology, and the specific technical scheme is as follows:
In a first aspect, an embodiment of the present invention provides a multiple solid waste synergistic soft foundation structure, including: a composite reinforcing pile and a reinforced cushion layer module,
The composite reinforced pile comprises a pile body and a first fiber reinforced outer wall, wherein conical pile tips and pile caps are respectively arranged at two ends of the pile body in the length direction, the first fiber reinforced outer wall comprises a connecting layer and a reinforced pile wall, the connecting layer is coated on the pile body, reinforcing ribs which are arranged along the length direction of the pile body are buried in the connecting layer, and the reinforced pile wall is coated outside the connecting layer and is in a spiral structure;
the reinforced cushion layer module comprises a second fiber reinforced outer wall and a pouring inner core, the second fiber reinforced outer wall is polyhedral, the pouring inner core is filled in the second fiber reinforced outer wall, and the reinforced cushion layer module is arranged above the pile cap of the composite reinforced pile.
Optionally, the pile body and the pouring inner core are made of multi-component composite reinforcement materials, and the components of the composite reinforcement materials comprise phosphogypsum, fly ash, lime, alkaline residue, recycled aggregate and cement.
Optionally, the connecting layer and the reinforced pile wall are made of fiber-forming high polymers, and the fiber-forming high polymers comprise ABS plastic, butadiene styrene-butadiene rubber, high-pressure polyethylene, low-pressure polyethylene, ethylene oxide, a silane coupling agent and an antioxidant.
Optionally, the casting inner core is embedded with a bidirectional fiber reinforced net.
Optionally, a locking fixing ring is arranged at the corner of the second fiber reinforced outer wall.
Optionally, the conical pile tip and the pile cap are formed by casting C30 concrete.
Optionally, the pile cap is in a regular polygon shape.
In a second aspect, an embodiment of the present invention provides a mold, which is suitable for preparing the multiple solid waste synergistic reinforced soft foundation structure provided in the first aspect, and includes: the pile head mold comprises a temperature control cylinder, a pile head mold body, a pile tip mold body and a connecting support, wherein the outer diameter of the temperature control cylinder is matched with the diameter of a pile body, an axial groove matched with the reinforcing rib is formed in the outer wall of the temperature control cylinder, the pile head mold body and the pile tip mold body are arranged at intervals and detachably connected through the connecting support, pile head pouring holes are formed in the pile head mold body, pile head pouring grooves matched with the pile head pouring holes are formed in the pile tip mold body, and the distance between the pile head mold body and the pile tip mold body is matched with the length of the temperature control cylinder.
Optionally, a plurality of pile cap pouring holes are arranged on the pile cap die body in an array manner, and a plurality of pile tip pouring grooves corresponding to the pile cap pouring holes one by one are arranged on the pile tip die body in an array manner.
In a third aspect, an embodiment of the present invention provides a method for preparing a multi-solid waste synergistic soft foundation structure, which is implemented based on the mold in the second aspect, and includes:
Classifying, crushing and screening the waste rubber plastics, and forcibly stirring, fusing and polymerizing the waste rubber plastics under the set pressure and the action of a catalyst to obtain a fiber-forming high polymer; mixing, adding water, stirring, strength development and maintenance operations are carried out on multi-component solid waste consisting of phosphogypsum, fly ash, lime, alkaline residue, recycled aggregate and cement according to a preset proportion so as to process the multi-component solid waste into a composite reinforcement material mixture;
Extruding molten fiber-forming high polymer into a first fusion belt and a second fusion belt, installing reinforcing ribs in the axial grooves, winding the first fusion belt on the temperature control cylinder at equal intervals and fully contacting the reinforcing ribs to form the connecting layer, winding the second fusion belt on the connecting layer at equal intervals to form the reinforced pile wall, and demolding the reinforced pile wall, the connecting layer and the first fiber-reinforced outer wall formed by the reinforcing ribs from the temperature control cylinder after the outer wall temperature of the reinforced pile wall is cooled to a preset temperature;
Arranging the first fiber reinforced outer wall between the pile cap die body and the pile tip die body, enabling two ends of the first fiber reinforced outer wall to be respectively connected with the pile cap pouring hole and the pile tip pouring groove, pouring the composite reinforcement material mixture into the pile cap pouring hole, the first fiber reinforced outer wall and the pile tip pouring groove from the opening of the pile cap pouring hole on the pile cap die body, synchronously vibrating and compacting, removing internal air holes and solidifying, removing the preparation die, and demoulding to form the composite reinforced pile;
And (3) injection molding the fiber-forming high polymer into the second fiber-reinforced outer wall, pouring the composite reinforcement material mixture into the second fiber-reinforced outer wall, vibrating and compacting, and sealing by using epoxy resin to form the reinforced cushion layer module.
Compared with the prior art, the beneficial effects of the embodiment of the invention at least comprise:
By adopting the multi-solid waste synergistic reinforced soft foundation structure provided by the embodiment of the invention, the construction can be started by simply cleaning and flattening the ground surface during the laying in a manner of arranging the composite reinforced piles in the pile sinking mode at the soft foundation position and arranging the reinforced cushion layer modules above the composite reinforced piles. The composite reinforced pile implanted below the soft soil foundation has a multi-layer nested structure, reinforcing ribs which are arranged along the length direction of the pile body are buried between the inner pile body and the first fiber reinforced outer wall, the reinforcing ribs can be reinforcing steel bars, glass fibers or reinforcing steel bars, the overall mechanical strength is improved inside the composite reinforced pile, and the overall bearing capacity of the buried region is further enhanced. The first fiber reinforced outer wall is of a spiral structure, and the flexible reinforced pile wall can be fully contacted with the soft soil foundation, so that the anti-sedimentation capacity is improved. And after the reinforced cushion layer module is paved above, the second fiber reinforced outer wall on the reinforced cushion layer module utilizes the flexibility and the bearing capacity of the second fiber reinforced outer wall, so that the problem of uneven settlement of the soft soil foundation can be further improved. Therefore, the technical defects of long construction period and poor bearing capacity and stability after reinforcement in the traditional foundation processing mode in the related technology are effectively overcome.
Drawings
FIG. 1 is a schematic structural view of a composite reinforced pile according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a temperature control cylinder according to an embodiment of the present invention;
FIG. 3 is a schematic view of a structure of a temperature control cylinder around which a first melting belt is wound according to an embodiment of the present invention;
FIG. 4 is a schematic view of a structure of a second fused band wrapped around a first fused band in accordance with an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of the first fiber reinforced outer wall, the reinforcing ribs and the temperature control cylinder after demolding according to the embodiment of the invention;
Fig. 6 is a schematic diagram of an assembly structure of a pile cap mold body, a pile tip mold body and a connecting bracket according to an embodiment of the present invention;
FIG. 7 is a schematic illustration of the structure of FIG. 6 in a casting condition;
FIG. 8 is a schematic structural view of a reinforced mat module according to an embodiment of the present invention;
FIG. 9 is a schematic view of the internal structure of a reinforced mat module according to an embodiment of the present invention;
fig. 10 is a flowchart of a preparation method provided in an embodiment of the present invention.
In the figure:
1-a composite reinforcing pile; 2-a reinforced cushion layer module; 3-a temperature control cylinder; 4-pile cap mould body; 5-pile tip mould body; 6-connecting a bracket; 11-pile body; 12-a first fiber reinforced outer wall; 13-reinforcing ribs; 21-a second fiber reinforced outer wall; 22-casting an inner core; 23-a bi-directional fiber reinforced web; 24-interlocking fixing rings; 31-an axial groove; 41-pile cap pouring holes; 51-pile tip pouring grooves; 111-conical pile tip; 112-pile cap; 121-a connection layer; 122-reinforcing pile walls; a-a first fusing belt; b-a second fusion belt.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be emphasized that, although a foundation reinforcement method such as a replacement method and a pre-compaction method in the related art can achieve a certain effect, the surface of the soft soil foundation needs to be excavated, replaced and filled with other materials in a large area for pretreatment, which has the problems of long construction period and high cost, and the surface layer of the soft soil foundation is subjected to large-area working treatment, which is easy to cause foundation deformation due to construction errors, and the bearing capacity and stability are poor.
Further, the industrial solid wastes such as phosphogypsum, building waste residue, fly ash, alkaline residue, waste plastic and the like are low in comprehensive utilization added value, and the treatment technology is immature, so that the symptoms and the root causes are not treated. At present, the aggregate amount of sand materials and asphalt waste materials is extremely large. The main component of the byproduct phosphogypsum in the phosphorite industry is CaSO4.2H2O, and the resource utilization is a worldwide problem. The industrial waste with huge quantity can cause new land and resource waste by unreasonable disposal, and more pollutes and destroys the surrounding ecological environment, thereby causing environmental protection secondary disasters. And the statistical data show that the energy consumption of the material production link occupies 57% of the total energy consumption of the building life cycle. Therefore, the development of an efficient, environment-friendly and economical soft soil foundation reinforcing method by using the solid waste is an urgent technical problem to be solved.
FIG. 1 is a schematic structural view of a composite reinforced pile according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a temperature control cylinder according to an embodiment of the present invention; FIG. 3 is a schematic view of a structure of a temperature control cylinder around which a first melting belt is wound according to an embodiment of the present invention; FIG. 4 is a schematic view of a structure of a second fused band wrapped around a first fused band in accordance with an embodiment of the present invention; fig. 5 is a schematic structural diagram of the first fiber reinforced outer wall, the reinforcing ribs and the temperature control cylinder after demolding according to the embodiment of the invention; fig. 6 is a schematic diagram of an assembly structure of a pile cap mold body, a pile tip mold body and a connecting bracket according to an embodiment of the present invention; FIG. 7 is a schematic illustration of the structure of FIG. 6 in a casting condition; FIG. 8 is a schematic structural view of a reinforced mat module according to an embodiment of the present invention; fig. 9 is a schematic diagram of an internal structure of a reinforced cushion module according to an embodiment of the present invention. Based on the foregoing considerations, as shown in fig. 1 and 8, an embodiment of the present invention provides a multi-solid waste synergistic reinforced soft foundation structure, which includes a composite reinforced pile 1 and a reinforced cushion layer module 2.
Referring to fig. 1 and 5, wherein the composite reinforced pile 1 includes a pile body 11 and a first fiber reinforced outer wall 12, both ends of the pile body 11 in the length direction are provided with a tapered pile tip 111 and a pile cap 112, respectively. The first fiber reinforced outer wall 12 comprises a connecting layer 121 and a reinforced pile wall 122, the connecting layer 121 is coated on the pile body 11, the connecting layer 121 is internally embedded with reinforcing ribs 13 arranged along the length direction of the pile body 11, and the reinforced pile wall 122 is coated outside the connecting layer 121 and is in a spiral structure.
The reinforced mat module 2 comprises a second fiber reinforced outer wall 21 and a casting core 22, the second fiber reinforced outer wall 21 being polyhedral. The casting core 22 is filled in the second fiber reinforced outer wall 21, and the reinforced cushion module 2 is arranged above the pile cap 112 of the composite reinforced pile 1.
In the embodiment of the invention, the multi-solid waste cooperative reinforcement soft foundation structure is formed by combining two parts of a composite reinforcement pile 1 and a reinforcement cushion layer module 2. Wherein the composite reinforced pile 1 is composed of a pile body 11 formed by pouring multi-component composite reinforcement materials, a connecting layer 121 made of fiber-forming polymers and a reinforced pile wall 122. The reinforced cushion module 2 is composed of a second fiber reinforced outer wall 21 made of fiber-forming high polymer and a composite reinforcement material mixture which is integrally in a concrete shape during preparation, is poured and filled in the second fiber reinforced outer wall 21 and finally is solidified into a whole.
The components of the multi-component composite reinforcement material comprise phosphogypsum, fly ash, lime, alkaline residue, recycled aggregate and cement, which are all obtained from the solid waste in each industrial field described in the foregoing.
Specifically, phosphogypsum is an industrial byproduct for producing phosphoric acid, and has large yield and needs harmless and large-scale treatment. Mainly contains calcium sulfate and a small amount of other impurities. Its use in the gel may improve the strength and durability of the composite reinforcement material to some extent. Phosphogypsum has fine granularity and activity, and can exert the gelation similar to cement in a gelating body. Meanwhile, sulfate in phosphogypsum can also react with sulfate in cement to form hard sulfonate hydrate, so that the strength of the composite reinforcement material is further enhanced. The concrete components are as follows: caO, mgO, SO2, al2O3, fe2O3, siO2 and P2O, F, wherein the mass percentages of the components are as follows: 32.14, 0.4, 43.38, 0.18, 0.04, 9.45, 1.18, 0.8.
The fly ash plays a role in supplementing cement matrix in cement. The fly ash mainly contains silicic acid, aluminate, ferric oxide and other components, and the components can react with silicon trioxide (C3S), aluminum dioxide (C3A) and phosphogypsum in cement to form new gelatinous substances, so that the amount of a cement matrix is increased. Filling: the fly ash also has a certain filling effect in the cement hydration and gelation process. The fly ash particles are fine and porous, can fill gaps among cement particles, and reduces the porosity of the cement. On one hand, the compactness of the cement mortar is improved, and the strength and durability of the composite reinforcement material are improved; on the other hand, the cement consumption can be reduced. Hydration reaction: silicic acid and aluminate compounds in the fly ash can react with hydroxyl ions in water to form gelled products such as calcium silicate, calcium aluminate and the like. These gel products are able to fill the pores in the cement matrix and combine with the hydration products formed in the cement to form a more dense and firm gel network. Re-gelation: the fly ash contains a certain pore structure and aluminum silicate hydration products, and the hydration products can carry out hydration reaction with hydroxyl ions in cement again to further form gel substances, so that the strength and stability of a cement matrix are improved. The index requirement for the fly ash is that the fineness is less than or equal to 25 percent, the water demand ratio is less than or equal to 105 percent, the SO3 is less than or equal to 3 percent, the free CaO is less than or equal to 8 percent, and the stability is less than or equal to 5mm.
Lime can participate in the hydration reaction of cement, regulate the speed of the hydration reaction and control the formation of hydration products. Hydroxyl ions (OH -) in the slaked lime participate in the hydration reaction in cement, and form stable hydrate with silicate ions (SiO 44-) and the like, so that the speed of the hydration reaction is increased. The existence of lime can also stabilize the concentration of hydroxide ions and delay the process of hydration reaction, so that hydration products are more uniformly distributed in a cement matrix. Alkali excitation: some chemical components in lime, such as calcium hydroxide (Ca (OH) 2), sodium oxide (Na 2 O), potassium oxide (K 2 O) and the like, can be used as alkali-activator to promote silicate reaction and hydration reaction in cement. The alkali excitation can increase the hardening rate of the cement gel and increase the strength and durability of the cement. Calcium hydroxide in the lime reacts with carbon dioxide (CO 2) to form calcium carbonate (CaCO 3). Calcium carbonate reacts with calcium solids produced by hydration of cement to form more stable silicate and carbonate hydrates. The calcium-petrifaction can further increase the strength and durability of cement and improve the long-term stability of the material. Can gel with acid oxide in phosphogypsum to generate phosphocalcific compound.
Cement is the main cementing material of the multi-component composite reinforcement material (in the concrete state in the embodiments of the invention), and its main components are silicate, aluminate, gypsum, etc. The strength of cement is mainly achieved by hydration reactions. The cement reacts with water to produce a gel, fills the pores in the concrete, and interacts with the aggregate to form a cementitious system, thereby improving the strength and durability of the concrete.
The alkaline residue is a slag byproduct and mainly contains silicic acid, aluminate and other components. Its use in gels can improve early and long term strength of concrete. The alkaline residue has vitreous phase and activity, and can be used as a supplementary material to participate in gelation reaction. Silicate in the alkaline residue reacts with silicate in the cement to generate a cementing material, so that pores of the cementing body are filled, and the compactness and strength of the concrete are improved. The concrete components are as follows: caCO3, mg2+, SO2, al2O3, fe2O3, siO2, P2O5 and H2O, wherein the mass percentages of the components are as follows: 28.1, 1.4, 43.38, 0.35, 0.57, 1.45, 1.18, 0.8, 45 or more.
Recycled aggregate is a granular material recovered from waste concrete and can be used for replacing traditional natural aggregate. The application of recycled aggregate in the gel can reduce the cost of the reinforcement mixture, and has the advantages of environmental protection and sustainable development. The strength formation mechanism of the recycled aggregate in the concrete is mainly to fill the pores of the cement gel by the action of the recycled aggregate and the cement lime gel and increase the physical combination of the stone and the gel.
The components of the fiber-forming high polymer comprise ABS plastic, butadiene styrene-butadiene rubber, high-pressure polyethylene, low-pressure polyethylene, ethylene oxide, a silane coupling agent and an antioxidant. The preparation method comprises the steps of classifying and crushing the recovered waste rubber plastics, selecting effective material types according to a proportion, sieving and storing, wherein the component proportions are as follows: styrene-butadiene rubber: high and low pressure polyethylene: ethylene oxide: silane coupling agent: antioxidant = 100:20:20:10:1:0.5. the injection molding process parameters are as follows: the temperature of the front area of the charging barrel is set at 245 ℃, the temperature of the middle area of the charging barrel is set at 250 ℃, the temperature of the rear area of the charging barrel is set at 260 ℃, and the temperature of an injection molding opening is set at 265 ℃. Forced stirring and fusing under the pressure of 1.2MPa and the action of a catalyst, and re-polymerizing to obtain the fiber-forming high polymer.
The composite reinforcement pile 1 and the reinforced cushion layer module 2 prepared by combining the composite reinforcement material and the fiber-forming polymer mainly improve the mechanical strength and durability of the pile body 11 in the composite reinforcement pile 1 and the pouring inner core 22 in the reinforced cushion layer module 2; the fiber forming high polymer has better processability and formability on the basis of high strength and high durability, is faster in processing efficiency compared with the method of integrally forming and manufacturing by adopting a single material, has certain flexibility, and can further improve the bearing capacity of the composite reinforced pile 1 and the reinforced cushion layer module 2 when being put into the soil foundation and arranged above the soft soil foundation, thereby effectively improving the problem of uneven settlement of the foundation.
The composite reinforced pile 1 and the reinforced cushion layer module 2 which are manufactured by adopting the components are firstly subjected to foundation investigation and design work before construction. The method comprises the steps of carrying out on-site investigation of a soft soil foundation, drilling a first-stage sample for sealing and storing through static sounding, cross plate shearing and other technologies, and determining parameters such as the property, bearing capacity, sedimentation property and the like of the soft soil foundation by combining with the liquid-plastic limit, direct shearing, consolidation compression and other indoor tests so as to carry out reasonable design and construction plan. And determining the arrangement scheme of the spiral reinforcement according to the foundation data and the design requirements. The arrangement scheme considers the factors of load and weak soil layer distribution, reinforcement pile length, pile distance, single pile bearing capacity and the like so as to ensure the uniform reinforcement and stability of the foundation and meet the design value requirement of the bearing capacity of the multi-solid waste synergistic reinforcement soft foundation structure. And then, cleaning and leveling the earth surface to ensure the flatness of the construction area and the available construction space. According to the design scheme, positioning lofting is carried out. Meanwhile, drainage measures are provided to exclude interference of surface water and groundwater overflowed due to compaction. And then, transporting the manufactured composite reinforced pile 1 to a construction site, and sequentially constructing according to the early positioning lofting points. The screw pile driver clamps the pile cap 112 of the composite reinforced pile 1 with an adjustable clamp, and lifts vertically, aligning the conical pile tip 111 to the loft point (where the clamping force can be maintained at a pressure of 2.2 MPa). And (3) applying 1.2MPa vertical pile sinking pressure downwards, and simultaneously stabilizing 500 N.m rotation torque to enable the external spiral reinforced pile wall 122 to axially rotate and sink into the soft soil foundation to be reinforced. After pile sinking to the designed depth (the top end of the pile cap is 10cm lower than the ground of the soft foundation), a plurality of composite reinforced piles 1, e.g. 3, are completed3, After pile sinking of the array, pile soil foundation bearing capacity detection is carried out, the bearing capacity design value is reached, and subsequent reinforcement pile sinking can be carried out. And finally, arranging the prefabricated reinforced cushion layer module 2 above the soft foundation with the pile sinking completed, and connecting and fixing the reinforced cushion layer module with each other by utilizing an external means to complete the layout of the multi-solid-waste cooperative reinforcement soft foundation structure.
By adopting the multi-solid waste synergistic reinforced soft foundation structure provided by the embodiment of the invention, the composite reinforced pile 1 is laid at the soft foundation position in a pile sinking way, and the reinforced cushion layer module 2 is laid above the composite reinforced pile 1, and the construction can be started by simply cleaning and flattening the ground surface during the laying. The composite reinforced pile implanted under the soft soil foundation is provided with a multi-layer nested structure, the reinforcing ribs 13 arranged along the length direction of the pile body 11 are buried between the inner pile body 11 and the first fiber reinforced outer wall 12, the reinforcing ribs 13 can be steel bars, glass fibers or reinforced steel bars, the overall mechanical strength is improved inside the composite reinforced pile, and the overall bearing capacity of the buried region is further enhanced. The reinforced pile wall 122 which is in a spiral structure on the first fiber reinforced outer wall 12 and has flexibility can be fully contacted with the soft soil foundation, so that the anti-sedimentation capability is improved. And after the reinforced cushion layer module 2 is paved above, the second fiber reinforced outer wall 21 on the reinforced cushion layer module 2 utilizes the flexibility and the bearing capacity of the second fiber reinforced outer wall, so that the problem of uneven settlement of the soft soil foundation can be further improved. Therefore, the technical defects of long construction period and poor bearing capacity and stability after reinforcement in the traditional foundation processing mode in the related technology are effectively overcome.
Further, the composite reinforcing pile 1 and the reinforced cushion layer module 2 prepared by combining the composite reinforcing body material and the fiber-forming high polymer are endowed with high strength and high durability so as to improve the bearing capacity and the anti-sedimentation performance, and meanwhile, the raw materials are all taken from industrial solid wastes and waste rubber plastics produced in various fields. Can realize the high-efficient, environmental protection and economic reuse of above-mentioned waste material, effectively reduce emission and the environmental pollution of waste material, reduce the production cost of multiple solid useless collaborative enhancement soft foundation structure simultaneously, compare the manufacturing cost of traditional reinforcement mode lower, and accord with sustainable development's theory.
Optionally, a bi-directional fiber reinforcement mesh 23 is embedded in the casting core 22. Illustratively, in the embodiment of the present invention, when the casting core 22 is cast into the second fiber reinforced outer wall 21, a plurality of bidirectional fiber reinforced nets 23 may be embedded in layers for multiple times, so as to further improve the overall mechanical strength of the reinforced mat module 2 and ensure the bearing capacity and the resistance to vibration.
Optionally, a interlocking securing ring 24 is provided at the corner of the second fiber-reinforced outer wall 21. Illustratively, in the embodiment of the present invention, after the plurality of reinforced cushion modules 2 are laid, the polygonal outer walls thereof may be used for mutual splicing, and the high-strength corrosion-resistant drawknot clamping bands are interlocked through the interlocking fixing ring 24, so as to form an interconnected cushion for restraining the reinforced cushion modules 2 from generating relative displacement, thereby further improving the overall stability of the multi-solid waste synergistic reinforced soft foundation structure.
Alternatively, tapered pile tip 111 and pile cap 112 are cast from C30 concrete. In the embodiment of the present invention, the conical pile tips 111 and pile caps 112 at both ends of the pile body 11 bear concentrated loads, so that the C30 concrete with higher water resistance and compactness is used to seal and protect the pile body 11 inside the first fiber reinforced outer wall 12 during pouring of the two positions, thereby further improving the overall structural strength.
Alternatively, pile cap 112 is regular polygon. Illustratively, in the embodiment of the invention, the pile cap 112 is poured into the regular hexagon, so that the pile cap 112 is conveniently and stably clamped by the adjustable hexagon clamp of the spiral pile sinking machine when the pile sinking process is carried out, the on-site shaping processing is reduced, the practicability is high, and the construction efficiency is further improved.
Referring to fig. 2 and 6, in the embodiment of the present invention, the multi-solid waste synergistic soft foundation structure needs to be produced and processed by combining with a matched preparation mold and a matched preparation method, the mold comprises a temperature control cylinder 3, a pile cap mold body 4, a pile tip mold body 5 and a connecting bracket 6, the outer diameter of the temperature control cylinder 3 is matched with the diameter of the pile body 11, axial grooves 31 matched with reinforcing ribs 13 are arranged on the outer wall of the temperature control cylinder 3, the pile cap mold body 4 and the pile tip mold body 5 are arranged at intervals and detachably connected through the connecting bracket 6, pile cap pouring holes 41 are arranged on the pile cap mold body 4, pile tip pouring grooves 51 matched with the pile cap pouring holes 41 are arranged on the pile tip mold body 5, and the distance between the pile cap mold body 4 and the pile tip mold body 5 is matched with the length of the temperature control cylinder 3.
Illustratively, the main materials of the pile cap die body 4, the pile tip die body 5 and the connecting support 6 are terpolymers of acrylonitrile, butadiene and styrene, namely ABS plastic, which has the characteristics of hardness, toughness and rigidity and good comprehensive mechanical properties. The pile cap die body 4 is provided with a split hexagonal prism module with the side length ranging from 120mm to 250mm, the pile tip die is a split inverted cone module with the diameter ranging from 200mm to 500mm and the height ranging from 240mm to 600 mm. The pile cap die body 4 and the pile tip die body 5 are fixedly connected with two ends of the strip-shaped connecting support 6, can be assembled in a detachable mode of bolt connection or plug connection, and are detached and demolded at any time after single pouring molding is completed, or are disassembled for storage and maintenance when not in use.
Referring to fig. 3 to 5, 7, 9 and 10, an embodiment of the present invention provides a method for preparing a multi-solid waste synergistic reinforced soft foundation structure, based on the implementation of a mold as shown in fig. 2 and 6, the following describes a preparation method of the soft foundation structure with reference to the foregoing mold structure, and the preparation method includes the following steps:
S1, classifying, crushing and screening waste rubber plastics, and forcibly stirring, fusing and polymerizing under the set pressure and the action of a catalyst to form a fiber-forming high polymer; the multi-component solid waste material consisting of phosphogypsum, fly ash, lime, alkaline residue, recycled aggregate and cement is processed into the composite reinforcement material mixture by mixing, adding water, stirring, strength development and maintenance operations according to a preset proportion.
Specifically, in this step, the craftsman process of the composite reinforcement material is as follows:
preparation: and preparing phosphogypsum, alkaline residue, recycled aggregate, fly ash, lime, cement and other multi-component solid wastes according to a designed proportion.
Mixing materials: the prepared multicomponent solid waste is poured into mixing equipment such as a concrete mixer, a mixing tank and the like. According to specific proportion requirements, the solid wastes of all the components are gradually added, and stirring and mixing are simultaneously carried out, so that the components are ensured to be uniformly distributed and mixed.
Adding water for adjustment: in the mixing process, a proper amount of water with a certain proportion is added, and stirring is continued. The amount of water added can be adjusted as needed to maintain the humidity and plasticity of the mixture.
Repeatedly stirring: according to specific requirements, repeated stirring is continued for a period of time to ensure that the mixture is fully mixed and uniform.
Forming strength: waiting for gelation: the homogenized multicomponent solid waste mixture needs to wait a certain time, a process called gelation. In this process, cement-based materials such as cement and lime react with water to form a hardened cementitious material.
Strength development: cement and lime in the multi-component solid waste mixture react with water gradually harden and strength gradually develops over time. This process takes a certain amount of time, depending on the specific ingredients of the mixture and the environmental conditions.
Curing: during the gelation process, the proper temperature and humidity of the mixture is maintained to promote strength development. The curing can be performed by adopting modes of covering, water spraying curing, wetting and wrapping and the like so as to improve the strength and the stability of the mixture.
S2, extruding the melted fiber forming high polymer into a first fusion belt a and a second fusion belt b, after the reinforcing ribs 13 are installed in the axial grooves 31, winding the first fusion belt a on the temperature control cylinder 3 at equal intervals and fully contacting the reinforcing ribs 13 to form the connecting layer 121, winding the second fusion belt b on the connecting layer 121 at equal intervals to form the reinforced pile wall 122, and after the outer wall temperature of the reinforced pile wall 122 is cooled to a preset temperature, demolding the first fiber reinforced outer wall 12 formed by the reinforced pile wall 122, the connecting layer 121 and the reinforcing ribs 13 from the temperature control cylinder 3 along the axial direction.
Specifically, in this step, the molten fiber-forming polymer is extruded into a first molten tape a having a width of 200mm and a thickness of 5mm and a second molten tape b having a bottom width of 190 to 210mm, a height of 80mm and a thickness of 5mm by using different extrusion port shaping dies of an extruder. Before the winding process, the reinforcing ribs 13 may be installed in the axial grooves 31, and after the winding process is performed and the cooling process, the reinforcing ribs 13 in the axial grooves 31 are fastened together with the first fusing belt a to form the connection layer 121. Fusion tape winding lap fusion process parameters: the temperature is 255-275 ℃, the axial overlap width is 35-45 mm, the tangential winding speed is 40-60 mm/min, and the fusion agent is epoxy resin. The first fiber-reinforced outer wall 12 formed by the reinforcement pile wall 122, the connection layer 121 and the reinforcing ribs 13 is usually demolded from the temperature control cylinder 3 in the axial direction after the outer wall temperature of the reinforcement pile wall 122 is cooled to 60 ℃.
S3, arranging the first fiber reinforced outer wall 12 between the pile cap die body 4 and the pile tip die body 5, enabling two ends of the first fiber reinforced outer wall to be respectively connected with the pile cap pouring hole 41 and the pile tip pouring groove 51, pouring the composite reinforcement material mixture into the pile cap pouring hole 41, the first fiber reinforced outer wall 12 and the pile tip pouring groove 51 from the opening of the pile cap pouring hole 41 on the pile cap die body 4, synchronously vibrating to compact, removing the inner air holes and solidifying, removing the die, and demolding to form the composite reinforced pile 1.
Specifically, in the pouring process, after synchronous vibrating compaction is completed, internal air holes are removed and solidification is carried out, the composite reinforcement material and the first fiber reinforced outer wall 12 jointly form the inner and outer composite structure composite reinforcement pile 1 which is mutually supported, and the unconfined compressive strength range of the inner and outer composite structure composite reinforcement pile 1 reaches the standard of 18-22 MPa.
S4, injection molding the fiber-forming high polymer into a second fiber-reinforced outer wall 21, pouring the composite reinforcement material mixture into the second fiber-reinforced outer wall 21, vibrating and compacting, and sealing by using epoxy resin to form the reinforced cushion layer module 2.
Specifically, in this step, the second fiber-reinforced outer wall 21 was extrusion-molded into upper and lower regular hexagonal fiber-reinforced outer walls (side length 500mm, height 220mm, wall thickness 5 mm) by an injection molding machine in a mold. And the interlocking fixing rings 24 are fused one by one at the hexagonal portions of the upper and lower hexagonal outer walls. The temperature of the injection molding opening is 265 ℃ and the pressure is 1.1MPa.
Wherein, a plurality of pile cap pouring holes 41 are arranged on the pile cap die body 4 in an array manner, and a plurality of pile tip pouring grooves 51 which are in one-to-one correspondence with the pile cap pouring holes 41 are arranged on the pile tip die body 5 in an array manner. Therefore, the casting processing of the pile bodies 11 can be realized at the same time, and the overall preparation efficiency is further improved.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (10)
1. The utility model provides a multiple solid useless collaborative enhancement soft foundation structure which characterized in that includes: a composite reinforcing pile (1) and a reinforced cushion layer module (2),
The composite reinforced pile (1) comprises a pile body (11) and a first fiber reinforced outer wall (12), conical pile tips (111) and pile caps (112) are respectively arranged at two ends of the pile body (11) in the length direction, the first fiber reinforced outer wall (12) comprises a connecting layer (121) and a reinforced pile wall (122), the connecting layer (121) is coated on the pile body (11), reinforcing ribs (13) which are arranged in the length direction of the pile body (11) are buried in the connecting layer (121), and the reinforced pile wall (122) is coated outside the connecting layer (121) and is of a spiral structure;
The reinforced cushion module (2) comprises a second fiber reinforced outer wall (21) and a pouring inner core (22), the second fiber reinforced outer wall (21) is polyhedral, the pouring inner core (22) is filled in the second fiber reinforced outer wall (21), and the reinforced cushion module (2) is arranged above the pile cap (112) of the composite reinforced pile (1).
2. The multi-solid waste synergistic reinforced soft foundation structure according to claim 1, wherein the pile body (11) and the pouring core (22) are made of multi-component composite reinforcement materials, and the components of the composite reinforcement materials comprise phosphogypsum, fly ash, lime, alkaline residue, recycled aggregate and cement.
3. The multi-solid waste synergistic reinforced soft foundation structure according to claim 1, wherein the connecting layer (121) and the reinforced pile wall (122) are made of fiber-forming high polymers, and the components of the fiber-forming high polymers comprise ABS plastic, styrene butadiene rubber, high and low pressure polyethylene, ethylene oxide, a silane coupling agent and an antioxidant.
4. The multi-solid waste cooperative reinforcement soft foundation structure according to claim 1, wherein the casting core (22) is embedded with a bidirectional fiber reinforcement net (23).
5. The multi-solid waste cooperative reinforcement soft foundation structure according to claim 1, wherein a corner of the second fiber reinforced outer wall (21) is provided with a interlocking fixing ring (24).
6. The multiple solid waste synergistic soft foundation structure of any one of claims 1 to 5, wherein the conical pile tip (111) and the pile cap (112) are cast with C30 concrete.
7. The multiple solid waste synergistic soft foundation structure of any one of claims 1 to 5, wherein the pile cap (112) is of regular polygon shape.
8. A die for preparing the multi-solid waste synergistic reinforced soft foundation structure according to any one of claims 1 to 7, which is characterized by comprising a temperature control cylinder (3), a pile cap die body (4), a pile tip die body (5) and a connecting support (6), wherein the outer diameter of the temperature control cylinder (3) is matched with the diameter of a pile body (11), an axial groove (31) matched with a reinforcing rib (13) is formed in the outer wall of the temperature control cylinder (3), the pile cap die body (4) and the pile tip die body (5) are arranged at intervals and detachably connected through the connecting support (6), a pile cap pouring hole (41) is formed in the pile cap die body (4), a pile tip pouring groove (51) matched with the pile cap pouring hole (41) is formed in the pile tip die body (5), and the distance between the pile cap die body (4) and the pile tip die body (5) is matched with the length of the temperature control cylinder (3).
9. The mold according to claim 8, wherein a plurality of pile cap casting holes (41) are arranged in an array on the pile cap mold body (4), and a plurality of pile tip casting grooves (51) corresponding to the pile cap casting holes (41) one by one are arranged in an array on the pile tip mold body (5).
10. A method for preparing a multi-solid waste synergistic reinforced soft foundation structure based on the mold implementation of claim 8, comprising the steps of:
Classifying, crushing and screening the waste rubber plastics, and forcibly stirring, fusing and polymerizing the waste rubber plastics under the set pressure and the action of a catalyst to obtain a fiber-forming high polymer; mixing, adding water, stirring, strength development and maintenance operations are carried out on multi-component solid waste consisting of phosphogypsum, fly ash, lime, alkaline residue, recycled aggregate and cement according to a preset proportion so as to process the multi-component solid waste into a composite reinforcement material mixture;
Extruding molten fiber-forming high polymer into a first melting belt (a) and a second melting belt (b), after installing reinforcing ribs (13) in the axial grooves (31), winding the first melting belt (a) on the temperature control cylinder (3) at equal intervals and fully contacting the reinforcing ribs (13) to form the connecting layer (121), winding the second melting belt (b) on the connecting layer (121) at equal intervals to form the reinforced pile wall (122), and after the outer wall temperature of the reinforced pile wall (122) is cooled to a preset temperature, demolding the reinforced pile wall (122), the first fiber-reinforced outer wall (12) formed by the connecting layer (121) and the reinforcing ribs (13) from the temperature control cylinder (3) along the axial direction;
Arranging the first fiber reinforced outer wall (12) between the pile cap die body (4) and the pile tip die body (5), enabling two ends of the first fiber reinforced outer wall to be respectively connected with the pile cap pouring hole (41) and the pile tip pouring groove (51), pouring the composite reinforcement material mixture into the pile cap pouring hole (41), the first fiber reinforced outer wall (12) and the pile tip pouring groove (51) from the opening of the pile cap pouring hole (41) on the pile cap die body (4), vibrating synchronously, compacting, removing internal air holes and solidifying, removing the preparation die, and demolding to form the composite reinforcement pile (1);
And (3) carrying out injection molding on the fiber-forming high polymer to form the second fiber-reinforced outer wall (21), pouring the composite reinforcement material mixture into the second fiber-reinforced outer wall (21), vibrating and compacting, and sealing by using epoxy resin to form the reinforced cushion layer module (2).
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