Environment-friendly reinforcement carrier pile and construction method and device thereof

Abstract

The invention relates to the technical field of foundation engineering construction, in particular to an environment-friendly reinforcement carrier pile and a construction method and device thereof. The environment-friendly reinforcement carrier pile comprises a reinforcement, a rigid pile and a carrier, the construction method comprises the steps that a hollow vibration spiral power head is used for driving high-low pressure nozzles and wing expanding blades of different media such as water, gas, slurry and powder on the outer side of a drill bit at the bottom of a drill rod, and a pile body reinforcement body is formed after grouting jet drilling hole forming and stirring bottom expanding, diameter expanding and top expanding are conducted; stirring and bottom expanding are conducted firstly, then filling and tamping bottom expanding are conducted, and a carrier is completed; the environment-friendly reinforcement carrier pile is formed after plain concrete or reinforced concrete or a precast pile or steel pipe concrete is bonded and wrapped with the reinforcement. The method has the advantages that the efficiency is improved, and the vibration effect is avoided; the low-carbon cementing material is used for replacing traditional cement, and the recycled aggregate is used for replacing natural sand-gravel materials to prepare the low-carbon concrete; and cost is saved, carbon dioxide emission is reduced, energy is saved, and environment is protected.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering construction, and in particular to an environmentally friendly reinforced carrier pile and a construction method and device thereof. Background Art

[0002] The carrier pile is a kind of pile that is formed by tamping a hole with a slender hammer, sinking the casing to the designed elevation, and then repeatedly tamping the compacted soil to form a carrier composed of cement sand mixture, compacted soil and impact soil. Its advantage is that the bearing capacity of the carrier pile is more than 3 times that of ordinary concrete cast-in-place piles with the same pile diameter and pile length under the same conditions. It is suitable for various soil layers, especially in soft plastic-plastic state of clay, silt, sand, gravel soil and other geological conditions. By adjusting the construction parameters, the bearing capacity of the pile foundation can be changed without adjusting the pile length, saving raw materials and costs.

[0003] Its disadvantages are: first, the holes formed by hammering and pipe drilling cannot penetrate hard interlayers or thick and dense sand layers, and large mechanical equipment such as long spiral drills, rotary drilling drills, hammer pile drivers, and down-the-hole hammers are required to drill holes, which is time-consuming, labor-intensive, and material-intensive, and the process is complicated and the construction period is delayed; secondly, the holes will collapse when encountering water, and the soil layer will loosen, shift, and deform; second, there is the soil squeezing effect. When constructing the carrier, the temporary pile body will be separated from the carrier, the carrier will shift, water and mud will enter between the pile end and the carrier, the pile will settle too much, and the bearing capacity will not meet the design requirements, resulting in design changes, additional piles, and increased base area, which will increase costs and delay the construction period; third, the carrier will produce a vibration effect during construction, which will affect the surrounding environment, cause residents to make trouble and stop work, and even cause cracks in surrounding houses due to vibration.

[0004] Relevant technologies of existing carrier piles are also disclosed: for example, the Chinese patent with application number CN2022112292630 discloses a construction method of prefabricated hollow internal ramming carrier piles. In the specific construction process of the above-mentioned prior art, a slender heavy hammer is lifted by a steel wire rope in the hollow pile body, and the cement sand mixture is rammed at the bottom of the hollow pile body with a relatively low ramming energy until the forming height of the dense cement sand mixture or the filling amount of the cement sand mixture reaches a preset value. The ramming energy is used to drive the cement sand mixture and the soil within a certain depth and range under the pile end to be reinforced and compacted to form a pile end carrier.

[0005] However, the above patent also utilizes a heavy hammer to tamp while filling; on the one hand, like conventional carrier piles, the carrier construction produces a vibration effect, which affects the surrounding environment, disturbs residents, causes disturbances by residents, and even causes cracks in the walls of surrounding buildings due to vibration, resulting in work stoppages and other adverse effects.

[0006] On the other hand, during the filling process, due to excessive filling, the filling in the prefabricated pile hole cannot be rammed out of the pile hole in time, which can easily cause cracks or even explosions at the bottom of the prefabricated hollow pile due to ramming. The bottom of the hollow pile is destroyed instantly, resulting in waste piles. The waste piles need to be pulled out and re-piled, which reduces work efficiency; or they need to be treated as waste piles, and another design, additional pile positions, larger foundations, increased costs and delayed construction period are required.

[0007] Secondly, for prefabricated hollow internal rammed carrier piles, a hammer or static pressure pile driver must first be used to complete the construction of the prefabricated piles, and the second carrier pile driver will then complete the carrier construction. Both require the coordination of multiple devices for construction, which requires a large amount of labor and power consumption, and has problems such as slow pile construction speed and low efficiency. Using diesel hammers, hydraulic hammers or static pressure piles to construct prefabricated hollow piles first will also produce problems such as noise, vibration and soil squeezing effect; and there are unsolvable problems such as slow pile construction speed and low efficiency.

[0008] Furthermore, with the introduction of the concept of "carbon neutrality", countries around the world have increasingly stringent control standards for greenhouse gas emissions. As a key carbon emission industry, how to effectively reduce carbon emissions has become an unavoidable and urgent issue for the cement industry. However, according to relevant information and market surveys, the design and construction of carrier piles still use traditional cement and natural sand and gravel, resulting in waste of resources, cement produces a large amount of carbon dioxide, and pollutes the environment.

[0009] Based on this, the environmentally friendly reinforced carrier piles in this application still have a lot of room for improvement and enhancement compared with the existing carrier pile construction technology. First, grouting and stirring are used to form holes to improve efficiency and increase the friction resistance on the side of the pile body; second, during the carrier construction, the bottom is first stirred and expanded, and then the secondary filler is rammed to expand the bottom, which reduces the number of fillers, improves efficiency, and avoids vibration effects; third, low-carbon cementitious materials and recycled aggregates that replace cement are used to replace natural sand and gravel to prepare low-carbon concrete; by reducing carbon emissions, reducing material costs and improving the durability of carrier piles, green and sustainable development is achieved. Summary of the invention

[0010] On the one hand: a construction method of an environmentally friendly reinforcement carrier pile, comprising the following steps: S1: Beidou Cloud system determines the pile position; reduces pile position deviation and reduces labor costs.

[0011] S2: The tilt sensor controls the verticality of the drill pipe to ≤0.5%; ensure the verticality of the drill pipe to avoid the pile body from tilting. S3: Empty pile construction: Turn on the hollow spiral power head to drive the drill bit at the bottom of the drill pipe, set the nozzle pressure of gas or water or gas and water outside the drill bit to 0.2-2.0Mpa, and drill to the pile top elevation together with the spiral blades and cutting tools.

[0012] S4: Reinforcement construction: Set the nozzle pressure of different media such as gas and slurry or powder and slurry or powder and water or gas and powder to 0.5-5.0Mpa, continue drilling to the preset depth, and complete the pile hole.

[0013] Stirring and expanding the bottom: Rotate and spray at the bottom of the seat for 30 seconds, set the nozzle pressure of 1.0-20Mpa for different media such as gas and slurry or powder and slurry or powder and water or gas and powder, open the expansion blades to make the outer diameter equal to 1.5-2.5 times the diameter of the pile body, and according to the preset expansion bottom height, complete at least one or more re-spraying and re-stirring up and down; retract the expansion blades and close the nozzle pressure to the minimum state.

[0014] Filling and bottom expansion: lift the drill 30-50cm, use the hammer inside the drill pipe to lightly hit the concrete outlet valve at the bottom of the drill bit, fill the drill pipe in batches, tamping while filling, and according to the bearing capacity of the pile and the quality of the internal hammer, meet the cumulative penetration of the last ten hits ≤30cm to complete the carrier construction.

[0015] S5: Rigid pile construction: c. Pull out the hammer inside the drill rod and pour concrete into the drill rod. While rotating and vibrating, lift the drill and pour concrete to the pile top elevation +50cm to complete the construction of the environmentally friendly reinforced carrier pile with plain concrete as the pile body.

[0016] Or use a special vibration hammer to vertically insert the steel cage into the center of the environmentally friendly reinforced carrier pile with a plain concrete pile body in step a, and after the anchorage length of the main reinforcement of the steel cage meets the design requirements, lift the drill to the ground; complete the construction of the environmentally friendly reinforced carrier pile with a reinforced concrete pile body.

[0017] d. Or take out the hammer from the drill pipe, place the steel cage inside the drill pipe first, then pour concrete, rotate and vibrate while lifting the drill to pour concrete to the pile top elevation +50cm, and then lift the drill to the ground; the construction of the environmentally friendly reinforced carrier pile with reinforced concrete as the pile body is completed.

[0018] e. Or, pull out the inner hammer of the drill pipe, pour a certain amount of fluid solidifying mud or soil solidifying agent or slurry or mortar or concrete solidifying material into the drill pipe, lift the drill pipe to the ground, vertically insert the precast pile into the pile hole, use the inner hammer to lightly hit the precast pile to the pile top elevation +10cm, and lift the drill to the ground; complete the construction of the environmentally friendly enhanced carrier pile with the pile body as a precast pile.

[0019] f. Or, pull out the hammer inside the drill pipe, pour a certain amount of fluid solidifying mud or soil solidifying agent or slurry or mortar or concrete solidifying material into the drill pipe, lift the drill pipe to the ground, vertically insert a steel pipe with a sealed pile tip at the bottom into the pile hole, use the internal hammer to tap the steel pipe to the pile top elevation +10cm, and then pour concrete into the steel pipe to complete the construction of the environmentally friendly enhanced carrier pile with steel pipe concrete as the pile body.

[0020] g. When the design requires vertical compression piles, the pile body should enter the carrier at least 1 / 4 of the depth.

[0021] h. When the design requires pull-out piles, the pile body should enter the carrier at least 1 / 2 depth.

[0022] Compared with other carrier piles, the above construction method has the following advantages: First, during the drilling process, multiple compaction devices with the same diameter as the pile body are set on the upper part of the drill bit and the upper and lower parts of the drill rod to force the drilled mud into the soil around the pile, ensuring the ground sludge is removed and environmentally friendly; the soil around the pile is denser and stronger, and the side friction resistance of the pile body is greater.

[0023] Secondly, the soil is cut synchronously by pressure grouting and expansion blades, especially when the bearing layer at the pile end is a dense sand layer, the stirring and bottom expansion speed is fast, the slurry and soil are mixed evenly, and the diameter of the stirring and bottom expansion is consistent.

[0024] The third is to stir and expand the bottom first, and then fill the construction carrier with secondary filling and tamp it. This can effectively control the amount of carrier filling, ensure the diameter of the carrier, reduce the pile settlement difference, and effectively avoid uneven settlement of the building.

[0025] Fourth, it reduces the number of fillings, improves construction efficiency, avoids vibration effects, and protects the surrounding environment.

[0026] Fifth, the plain concrete pile body after compaction and vibration forming has a small filling coefficient, high concrete density and high strength.

[0027] Sixth, after the hole is formed by compaction, a certain amount of solidified material is poured into the hole. The solidified material is forcibly squeezed into the soil around the pile through the prefabricated pile, thereby further improving the density and strength of the reinforced body.

[0028] Seventh, the pile body should enter the carrier to a certain depth, so that the pile end and the carrier can be better bonded, which improves the stability of the pile and at the same time the pull-out resistance can be increased by 3-5 times.

[0029] Furthermore, a method for constructing an environmentally friendly reinforced carrier pile also includes the construction of an environmentally friendly reinforced carrier pile with stirring and diameter expansion: i. Repeat construction steps S1-S4a; lift the drill to the preset stirring and expanding position, set the nozzle pressure of 1.0-20Mpa for different media such as gas and slurry or powder and slurry or powder and water or gas and powder, open the expansion blades to make the outer diameter equal to 1.5-2.5 times the pile diameter, and according to the preset expansion height, complete at least one or more re-spraying and re-stirring up and down; retract the stirring blades, close the nozzle pressure to the minimum state, and complete the stirring and expanding; and the pile body can be expanded at any one or more places.

[0030] j. Continue to drill down to the preset depth, repeat steps S4b and S5, and complete the construction of the environmentally friendly reinforced carrier pile with mixing and diameter expansion.

[0031] Its advantages are: in soft foundation or backfill foundation, it can greatly improve the bearing capacity, stability and deformation resistance of the pile.

[0032] Furthermore, a method for constructing an environmentally friendly reinforced carrier pile also includes the construction of an environmentally friendly reinforced carrier pile with stirring and top expansion.

[0033] k. Repeat construction steps S1-S4a, lift the drill to the top expansion position, set the nozzle pressure of 1.0-5.0Mpa for different media such as gas and slurry or powder and slurry or powder and water or gas and powder, open the expansion blades to make the outer diameter equal to 1.5-2.5 times the pile diameter, and according to the preset top expansion height, complete at least one or more re-spraying and re-mixing up and down; retract the expansion blades, close the nozzle pressure to the minimum state, and complete the mixing and top expansion.

[0034] 1. Repeat the construction steps S4b and S5 to complete the construction of the environmentally friendly reinforced carrier pile with mixing and top expansion.

[0035] Its advantages are: the expansion of the top of the pile forms a "pile cap effect", which improves the impact resistance of the pile top, diffuses the concentrated load to the deep foundation, and at the same time improves the horizontal bearing capacity of the pile.

[0036] Furthermore, a method for constructing an environmentally friendly reinforcement carrier pile also includes the construction of an environmentally friendly reinforcement carrier pile of a mixing pile.

[0037] m. Repeat steps S1-S4a, set the nozzle pressure of 1.0-20Mpa for different media such as gas and slurry or powder and slurry or powder and water or gas and powder, open the mixing blades to make the outer diameter equal to 1.5-2.5 times the diameter of the pile body, spray and stir while raising the drill to the pile top elevation at a constant speed; continue to drill at least once or more times to complete the re-spraying and re-stirring to the preset depth, retract the wing expansion blades, close the nozzle pressure to the minimum state, and complete the mixing pile.

[0038] n. Repeat steps S4b and S5 to complete the construction of the environmentally friendly reinforced carrier pile of the mixing pile.

[0039] Its advantages are: mixing piles use cheap solidified soil to increase the area, improve the side friction resistance of the pile body, horizontal bearing capacity and pile body stability.

[0040] Furthermore, an environmentally friendly reinforced carrier pile construction method also includes a solidified material, a powder, a slurry, a mortar, a concrete and a filler.

[0041] The solidified material includes fluid solidified mud or soil solidifying agent or slurry or mortar or concrete; the strength of the solidified material is 1.0-20Mpa.

[0042] The powder includes any one of low-carbon cementitious materials or soil solidifying agents or a mixture of the two; a certain amount of admixture may also be added to the powder.

[0043] Low-carbon cementitious materials include at least two or more mixtures of multi-source solid wastes such as fly ash, steel slag, slag, vaporized slag, manganese slag, carbide slag, lithium slag, industrial by-gypsum, coal gangue, tailings, red mud, aluminum ash, fly ash, sludge, alkali slag and salt mud. They are pre-treated by crushing, drying, thermal activation, physical activation and chemical activation to become ultra-fine powder with a specific surface area of ​​400-700㎡ / kg, which can replace traditional cement. The performance indicators meet or exceed those of cement.

[0044] Admixtures include any one or a mixture of water reducing agent, early strength agent, retarder, air entraining agent, water repellent and expansion agent.

[0045] The slurry is made by mixing powder and water with a water-cement ratio of 0.5-2.5.

[0046] The mortar includes low carbon cementitious materials mixed with recycled fine aggregate and water to form a fluid mixture; the mortar strength is M5-M30.

[0047] The concrete is low-carbon concrete, which includes low-carbon cementitious materials, recycled aggregates, water, water-reducing agents and admixtures in a certain ratio. The strength of the low-carbon concrete is C30-C200.

[0048] Recycled aggregates include any one or several mixed coarse and fine aggregates from pre-treated solid wastes such as construction waste, waste rock, waste slag and tailings.

[0049] The filler includes any one or a mixture of recycled aggregate, mortar mixture or dry hard concrete.

[0050] Its advantages are: using a variety of solid wastes to scientifically compound after pretreatment into low-carbon cementitious materials to replace traditional cement, using recycled aggregates to replace natural sand and gravel to prepare low-carbon concrete; saving costs, reducing carbon dioxide emissions, saving energy and protecting the environment, protecting the environment, and complying with the national carbon neutrality policy.

[0051] In the second aspect, an environmentally friendly reinforced body carrier pile comprises a reinforced body and a rigid pile: The reinforcement includes a mixture of powder or slurry and soil, or mortar or concrete; the strength of the reinforcement is 0.5-20Mpa.

[0052] The reinforcement body includes any one or a combination of equal diameter, expanded top, expanded diameter and expanded bottom; the diameter of the reinforcement body is 1.5-2.5 times the diameter of the rigid pile.

[0053] Rigid piles include plain concrete or reinforced concrete or precast piles or steel tube concrete.

[0054] The diameter of the rigid pile is 300-2000㎜.

[0055] Plain concrete or reinforced concrete can be in any one of the following forms, or a combination of several forms, including equal diameter, expanded diameter, expanded top, or expanded bottom.

[0056] Further prefabricated piles include conventional prefabricated piles and low-carbon prefabricated piles.

[0057] Conventional precast piles and low-carbon precast piles include solid piles, hollow piles, round piles, square piles and special-shaped piles in any composite form of non-prestressed steel bars, prestressed steel bars, prestressed non-prestressed composite bars and fiber composite bars.

[0058] Low-carbon prefabricated piles include prefabricated piles that are cast or centrifugally formed using low-carbon concrete made from low-carbon cementitious materials that replace cement and recycled aggregates that replace natural sand and gravel as main raw materials.

[0059] Fiber composite bars include carbon fiber composite bars and basalt fiber composite bars.

[0060] The strength of precast piles is C60-C200.

[0061] The advantages are: compared with the existing carrier piles, the environmentally friendly reinforced carrier piles of the present invention have high pile body strength, and the vertical compressive bearing capacity, horizontal bearing capacity and tensile bearing capacity of a single pile can be increased by 2-4 times. The settlement amount and settlement difference of the pile are small, which reduces the uneven settlement of the building; the density of the pile can be reduced, saving costs; and it has strong corrosion resistance and good durability.

[0062] A third aspect is a construction device for environmentally friendly reinforced prefabricated piles, which is used for execution.

[0063] In summary, the present application includes at least one of the following beneficial technical effects: 1. The hollow vibrating spiral power head is used to drive the high and low pressure nozzles and extrusion expansion devices of 0.5Mpa-5.0Mpa for various media such as water, gas, slurry and powder on the drill bit, and cooperate with grouting injection, spiral cutting, vibration compaction and drilling to form holes; it can penetrate the harder interlayer and enter the dense sand layer to form holes with fast speed and high efficiency.

[0064] 2. By using the vibration device on the hollow vibrating spiral power head, the drill bit and the extrusion and expansion device on the outside of the drill rod that is equal to the diameter of the pile body, the mud drilled out during the hole-making process will be vibrated, repeatedly squeezed and cemented to make the soil around the pile denser and stronger; it can greatly increase the side friction resistance of the pile, shorten the pile length and save costs.

[0065] 3. Utilize the nozzle pressure of 10Mpa-20Mpa of slurry on the drill bit, and make the outer diameter of the wing expansion blade equal to the bottom expansion diameter according to the pile end bottom expansion diameter and height. The grouting dry spraying bottom expansion is completed through pressure grouting spraying + dry spraying powder + wing expansion blades, which can ensure that the bottom expansion diameter and height of each pile are consistent and the quality is controllable.

[0066] 4. After grouting or dry spraying to expand the bottom, use the filling port on the drill pipe and the tamping hammer to fill the soil in batches, tamp and compact the soil, and then expand the bottom a second time; this further improves the density of the soil at the pile end, increases the bottom expansion area, and improves the pile end resistance; the single pile has a high bearing capacity, reduces the number of piles, and saves costs.

[0067] 5. Use the filling port on the upper part of the drill pipe to directly pour concrete or place the steel cage first and then pour concrete or implant prefabricated piles. Vibrate and rotate while lifting the drill to the pile top elevation to drill a hole, expand the bottom and form a pile in one go. No secondary drilling is required, saving equipment investment.

[0068] 6. Use low-carbon cementitious materials to replace cement, coarse and fine aggregates from solid waste to replace sand and gravel, and low-carbon concrete to replace ordinary concrete, turning waste into treasure, saving resources, reducing carbon dioxide emissions by 80%, and reducing costs by more than 20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 The overall structure of the pile body of the present invention is shown in FIG. Figure 1 .

[0070] Figure 2 The overall structure of the pile body of the present invention is shown in FIG. Figure 2 .

[0071] Figure 3 The overall structure of the pile body of the present invention is shown in FIG. Figure 3 .

[0072] Figure 4 It is a structural schematic diagram of the pile forming device of the present invention.

[0073] Figure 5 The present invention Figure 4 Enlarged schematic diagram of part A in the middle.

[0074] Figure 6 It is the process flow chart of this application.

[0075] In the figure, 1, pile body; 11, pile body main body; 12, pile body expansion body; 13, pile body carrier; 2, hollow vibrating spiral power head; 3, rotary joint; 4, drill rod; 5, drill bit; 6, inner hammer; 7, extrusion and expansion device; 51, cutting tool; 52, spiral blade; 53, expansion blade; 54, high and low pressure nozzles. DETAILED DESCRIPTION

[0076] The following is combined with Figures 1 to 6 This application is described in further detail.

[0077] Implementation method 1: S1: Use GPS or Beidou system to determine the pile position, reduce the error of manual positioning, and prevent the pile position deviation caused by inaccurate stakeout. S2: The inclinometer controls the verticality of the drill pipe to ≤0.5%, and the inclinometer sensor transmits data to obtain a qualified verticality of ≤0.5%.

[0078] S3: Set the high and low pressure nozzle pressures of different media such as water, gas, slurry and powder at the bottom of the drill bit to the minimum state. The medium nozzle pressure sensor and medium flow sensor connected to the background equipment transmit the hollow spiral variable frequency vibration head start signal.

[0079] S4: The hollow spiral variable frequency vibration head drives the gas and slurry or powder and slurry nozzle pressure set at 1.0-10Mpa on the drill bit at the bottom of the drill pipe to start drilling into the foundation; according to the hardness and moisture content of different soil layers, it cooperates with the cutting tool and spiral blades to coordinate pressure grouting injection and spiral cutting to drill a hole to the preset pile end expansion position.

[0080] During the compaction drilling, multiple compaction devices arranged on the upper part of the drill bit and the upper and lower parts of the drill rod will compact the drilled mud mixture into the soil around the pile to ensure that there is no mud on the ground, which is environmentally friendly.

[0081] S5: Set the nozzle pressure of gas and slurry or powder and slurry to 1.0-20Mpa, spray at the bottom for 30s, open the expansion wing stirring blades to an outer diameter equal to the preset grouting stirring bottom expansion diameter, spray and stir up and down according to the preset grouting stirring bottom expansion height, retract the expansion wing stirring blades, close the nozzle pressure to the minimum state, and complete the grouting stirring bottom expansion.

[0082] S6: At 1 / 3-3 / 4 of the depth of grouting, mixing and bottom expansion, open the concrete outlet of the valve at the bottom of the drill bit, lift the inner hammer, and fill the drill pipe with fillings in batches, tamping while filling, and stop filling when the preset filling volume is reached; set the lifting height of the inner hammer according to the quality of the inner hammer and the bearing capacity of the pile, and measure to ensure that the cumulative penetration of the last ten blows is ≤30cm, and complete the filling tamping and bottom expansion.

[0083] When the measurement meets the requirement that the cumulative penetration of the last ten strikes is greater than 30cm, continue to tamp the filler until the measurement meets the requirement that the final actual cumulative penetration is ≤30cm, and the construction of the filler tamping carrier is completed.

[0084] S7: Pull out the hammer inside the drill rod, pour concrete into the drill rod, rotate, vibrate, lift the drill and pour concrete to the designed elevation of the pile top +50cm, close the concrete outlet of the valve at the bottom of the drill bit, lift the drill to the ground, and the construction of the environmentally friendly reinforced carrier pile with plain concrete as the pile body is completed.

[0085] Or use a special vibration hammer to vertically insert the steel cage into the center of the pile body made of plain concrete, thereby completing the construction of the environmentally friendly reinforced carrier pile with the pile body made of reinforced concrete.

[0086] Or pour solidifying materials such as solidifying mud, soil solidifying agent, slurry, mortar and concrete into the drill rod to the 1 / 2-2 / 3 position of the pile hole, lift the drill rod to the ground, vertically insert the precast pile into the pile hole to the pile top elevation +10cm, and complete the construction of the environmentally friendly enhanced carrier pile with the pile body as a precast pile.

[0087] S8: When the design requirement is for vertical compression piles, the pile body should penetrate into the carrier at least 1 / 4 of the depth; when the design requirement is for pull-out piles, the pile body should penetrate into the carrier at least 2 / 3 of the depth.

[0088] Implementation method 2: When the foundation is silt and soft soil, the water content of silt and soft soil is between 30% and 70%. The natural strength of silt and soft soil is low, the shear strength is low, the compressibility is high, and it has obvious rheological and thixotropic properties. When buildings are built on them, uneven settlement is prone to occur, causing damage, cracking or even collapse of the buildings.

[0089] S9: Repeat the steps S1 to S3 in the first embodiment.

[0090] S10: Turn on the powder nozzle pressure of 0.5-2.0Mpa on the drill bit, open the outer diameter of the wing-spreading stirring blade to be equal to 1.5-2.0 times the diameter of the pile body, and dry-spray 10%-30% powder while drilling, and stir to the bottom expansion position of the pile end; turn on the slurry nozzle pressure of 10-20Mpa on the drill bit, continue to open the outer diameter of the wing-spreading stirring blade to be equal to 2.0-2.5 times the diameter of the pile body, spray and stir up and down repeatedly to complete the grouting mixing and bottom expansion.

[0091] S11: Repeat the construction steps S5 and S8 in the above-mentioned embodiment 1 to complete the construction of the environmentally friendly reinforcement carrier pile.

[0092] Through dry powder spraying, the physical and mechanical properties of silt soft soil are changed, the area around the pile is increased, and the stability and bearing capacity of the pile are improved.

[0093] Implementation method three: When the foundation soil is miscellaneous fill, the composition of the miscellaneous fill is complex: it contains construction waste such as broken bricks, rubble, rotten wood, domestic waste such as residual bones and furnace ash, and industrial waste such as slag and coal slag. The density, strength and compressibility of miscellaneous fill vary greatly, the bearing capacity is low, the porosity of the soil is large, and the permeability is uneven, which can easily lead to unstable foundations.

[0094] S12: Repeat the steps S1 to S3 in the first embodiment.

[0095] S13: Turn on the gas nozzle pressure of 1.0-2.0Mpa and the slurry nozzle pressure of 2.0-20Mpa on the drill bit, open the outer diameter of the wing stirring blade to 1.5-2.0 times the diameter of the pile body, drill, pressure grout, and stir to the bottom expansion position of the pile end; turn on the slurry nozzle pressure of 10-20Mpa on the drill bit, continue to open the outer diameter of the wing stirring blade to 2.0-2.5 times the diameter of the pile body, spray and stir up and down to complete the grouting and stirring bottom expansion.

[0096] S14: Repeat the construction steps S5 and S8 in the above-mentioned embodiment 1 to complete the construction of the environmentally friendly reinforcement carrier pile.

[0097] The slurry is injected into the foundation fill soil. The slurry diffuses and penetrates in the soil, combines with the particles in the soil, and forms a new cementing body, thereby improving the density and bearing capacity of the soil and increasing the stability of the pile body.

[0098] Implementation method 4: When the foundation soil is collapsible loess, it has low water content, low natural density, large pores, high porosity and strong water permeability. Collapsible loess is a yellow silt sediment containing a small amount of clay particles and sand particles. When soaked by water, the soil structure will be quickly destroyed, resulting in large additional sinking, and the strength will decrease rapidly, causing foundation settlement and affecting the stability of the building.

[0099] S15: Repeat the steps S1 to S3 in the first embodiment.

[0100] S16: Turn on the gas nozzle pressure of 1.0-2.0Mpa and the slurry nozzle pressure of 2.0-20Mpa on the drill bit, open the outer diameter of the wing-spreading stirring blade to be equal to 1.5-2.0 times the diameter of the pile body, drill, pressure grout, and stir to the bottom expansion position of the pile end; turn on the slurry nozzle pressure of 10-20Mpa on the drill bit, continue to open the outer diameter of the wing-spreading stirring blade to be equal to 2.0-2.5 times the diameter of the pile body, spray and stir up and down repeatedly to complete the grouting stirring and bottom expansion.

[0101] S17: Repeat the construction steps S5 and S8 in the above-mentioned embodiment 1 to complete the construction of the environmentally friendly reinforcement carrier pile.

[0102] The slurry fills the voids in the collapsible loess, improves the density and strength of the collapsible loess, and effectively reduces the settlement and deformation of the collapsible loess foundation, thereby achieving the purpose of eliminating collapse and increasing the side friction of the pile.

[0103] Implementation method five: When the foundation soil is liquefied soil, the liquefied soil layer will cause a sudden increase in pore water pressure under the action of an earthquake or other external force, and the soil will lose its shear strength in a short period of time. Its liquid-like properties will bring serious safety hazards to buildings.

[0104] S18: Repeat the steps S1-S3 in the first embodiment.

[0105] S19: Turn on the powder nozzle pressure of 0.2-2.0Mpa on the drill bit, open the outer diameter of the wing-spreading stirring blade to be equal to 1.5-2.0 times the diameter of the pile body, and dry-spray 10%-30% powder while drilling, and stir to the bottom expansion position of the pile end; turn on the slurry nozzle pressure of 10-20Mpa on the drill bit, continue to open the outer diameter of the wing-spreading stirring blade to be equal to 2.0-2.5 times the diameter of the pile body, spray and stir up and down repeatedly to complete the grouting mixing and bottom expansion.

[0106] S20: Repeat the construction steps S5 and S8 in the above-mentioned embodiment 1 to complete the construction of the environmentally friendly reinforcement carrier pile.

[0107] By dry spraying powder and mixing it together with the expansion wing mixing blades on the outside of the drill bit, the powder absorbs excess water in the liquefied soil, thereby eliminating liquefaction, increasing the friction resistance on the pile side, and increasing the stability of the pile.

[0108] Implementation method 6: Reference Figures 1 to 3 As shown in Figures AF, in this embodiment, an environmentally friendly reinforced carrier pile is disclosed, including a pile body 1, wherein the pile body 1 includes a pile body main body 11 and a pile body expansion body 12, and a pile body carrier 13 is arranged at the bottom of the pile body 11. As can be seen from the five schematic diagrams abcde in the figure, the pile body 1 is composed of the pile body main body 11, the pile body expansion body 12 and the pile body carrier 13, which together form any one or several composite forms of equal diameter or expanded diameter; the figure lists the corresponding combination methods.

[0109] In the present embodiment, the pile body 11 is plain concrete or reinforced concrete or precast pile or steel tube concrete, and the diameter of the pile body 11 is 300㎜-2000㎜, and the commonly used 500mm is preferably taken as an example in the present embodiment, and the concrete strength of the pile body 11 is C30-C120; it should be particularly noted that when the pile body 11 adopts a precast pile, the precast pile is a solid pile or hollow pile formed by casting or centrifugation, and the cross-section of the pile body 11 is a circular or square or polygonal or non-uniform cross-section special-shaped pile, and the strength of the precast pile is C60-C200.

[0110] When the pile body 11 is a reinforced concrete pile, its steel bars are non-prestressed steel bars or prestressed steel bars or a composite reinforcement of prestressed steel bars and non-prestressed steel bars, and there are anchor bars at both ends or at one end or at both ends, and there are end plates at both ends or at one end or at both ends (not shown in the figure).

[0111] Continue to refer to Figure 1, is a schematic diagram of the structure of the pile expansion body 12 in this application. Specifically, in this embodiment, the pile expansion body 12 is a plurality of structures protruding from the pile body 11. The pile expansion body 12 is made of the pile surrounding soil or a mixture of slurry and soil after grouting vibration compaction and bonding, or a mortar or low-carbon concrete mixed with low-carbon cementitious materials, solid waste-based coarse and fine aggregates and water. The composition is adjusted according to actual adaptability. It is further explained that the strength of the pile expansion body 12 is 1Mpa-10Mpa, and the diameter of the pile expansion body 12 is 1.5-2.5 times the diameter of the pile body 11.

[0112] Also continue to refer to Figure 1 As shown, it is a schematic diagram of the structure of the pile body carrier 13 in the present application. The pile body carrier 13 is arranged at the bottom of the pile body 11, and the pile body 1 and the pile body expansion body 12 are manufactured. The pile body carrier 13 is expanded by directly ramming the bottom with fillers, or by grouting rotary spraying and dry spraying of powders and expansion wing stirring and expanding the bottom, or by grouting rotary spraying and dry spraying of powders and expansion wing stirring and matching filler ramming and expanding the bottom, to form a compacted soil and influence the soil to form a carrier.

[0113] In this embodiment, the grouting slurry includes a mixture of one or two composite powders of a soil solidifying agent or a low-carbon cementitious material and water, and the water-cement ratio of the slurry is 0.5-2.5.

[0114] The filler in the construction of the carrier 13 is recycled aggregate or mortar mixture or dry hard concrete.

[0115] Reference Figure 4 As shown, it is a schematic diagram of the structure of the environmentally friendly reinforced pile forming device disclosed in this embodiment. In this embodiment, the environmentally friendly reinforced pile forming device is composed of a hollow vibrating spiral power head 2, a rotary joint 3, a drill rod 4, a drill bit 5 and an inner hammer 6 from top to bottom; it should be noted that, in this embodiment, the hollow vibrating spiral power head 2 is an existing device such as a vibration motor that can generate a vibration source and a rotation source, and the rotary joint 3 connects the hollow vibrating spiral power head 2 with the drill rod 4. The rotary joint 3 includes an inlet end, an internal channel and an outlet end, and the inlet end and the outlet end are connected through the internal channel.

[0116] In this embodiment, the drill rod 4 includes an outer tube, an inner tube and an independent channel. The independent channel is composed of a seamless steel tube or a high-pressure hose. A plurality of extrusion and expansion devices 7 and filling ports are also provided on the outer tube. It should be noted that during the extrusion and expansion process, the extrusion and expansion device 7 fills the material through the filling port, thereby realizing the expansion of the pile, which will be explained in detail later.

[0117] Reference Figure 4 and Figure 5As shown, it is a specific schematic diagram of the drill bit 5 in this embodiment. The drill bit 5 includes a feed pipe, a discharge pipe and a material channel. The feed pipe, the discharge pipe and the material channel are set for the purpose of material operation, which is not shown in the prior art figure. The material channel is also composed of a seamless steel pipe or a high-pressure hose. An extrusion and expansion device 7 is also provided on the drill bit 5. In addition, a cutting tool 51, a spiral blade 52, a wing expansion blade 53 and a high and low pressure nozzle 54 are also provided; the diameter of the pile body carrier 13 can be expanded by the extrusion and expansion device, and the cutting tool 51, the spiral blade 52 and the wing expansion blade 53 can break the ground and open the hole more quickly; it should be noted that the cutting tool 51 can be a metal cutting blade, the spiral blade 52 is a metal spiral blade, and the wing expansion blade 53 is a metal blade installed on the spiral blade 52, which can expand outward relative to the spiral blade 52, and the outward expansion force comes from the external force provided by the hydraulic cylinder (not shown in the figure), so that the outward expansion of the pile body can be achieved.

[0118] Replay Figure 2 As shown, in this embodiment, the inner hammer 6 is a hydraulic hammer, an electric hammer, a pneumatic hammer, or a steel column hammer, and its cross-sectional area is circular, square, or polygonal, and the hammer bottom is flat, semi-circular, or conical, with a diameter of 200 mm to 1800 mm and a mass of 3.0 t to 30 t.

[0119] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An environmentally friendly reinforced carrier pile construction method, characterized in that: The following steps are involved: S1: Beidou cloud system stake positioning; S2: The tilt sensor controls the verticality of the drill pipe to ≤ 0.5%; S3: Empty pile construction: Turn on the hollow vibrating spiral power head to drive the drill bit at the bottom of the drill pipe, set the nozzle pressure of gas or water or gas and water outside the drill bit to 0.2-2.0Mpa, and drill to the pile top elevation together with the spiral blade and cutting tool; S4: Reinforcement construction: Set the nozzle pressure of different media such as gas and slurry or powder and slurry or powder and water or gas and powder to 0.5-5.0Mpa, continue drilling to the preset depth, and complete the pile hole; a. Stirring and expanding the bottom: Rotate and spray the bottom of the base for 30 seconds, set the nozzle pressure of 1.0-20Mpa for different media such as gas and slurry or powder and slurry or powder and water or gas and powder, open the wing expansion blades to make the outer diameter equal to 1.5-2.5 times the pile body diameter, and according to the preset bottom expansion height, complete at least one or more times of re-spraying and re-stirring up and down; retract the wing expansion blades and close the nozzle pressure to the minimum state; b. Filling and bottom expansion: lift the drill 30-50cm, use the drill rod internal hammer to lightly hit the concrete outlet valve at the bottom of the drill bit, fill the drill rod in batches, and tamp while filling. According to the pile bearing capacity and the quality of the internal hammer, the cumulative penetration of the last ten hits should be ≤30cm, and the carrier construction is completed; S5: Rigid pile construction: c. Pull out the hammer inside the drill rod, pour concrete into the drill rod, rotate and vibrate, and pour concrete to the pile top elevation +50cm, completing the construction of the environmentally friendly reinforced carrier pile with plain concrete as the pile body; Or use a special vibration hammer to vertically insert the steel cage into the center of the environmentally friendly reinforced body carrier pile with a plain concrete pile body in step a, and after the anchorage length of the main reinforcement of the steel cage meets the design requirements, lift the drill to the ground; complete the construction of the environmentally friendly reinforced body carrier pile with a reinforced concrete pile body; d. Or take out the hammer inside the drill rod, place the steel cage inside the drill rod first, then pour concrete, rotate and vibrate, lift the drill and pour concrete to the pile top elevation +50cm, then lift the drill to the ground; complete the construction of the environmentally friendly reinforced carrier pile with reinforced concrete as the pile body; e. Or take out the inner hammer of the drill pipe, pour a certain amount of fluid solidifying mud or soil solidifying agent or slurry or mortar or concrete solidifying material into the drill pipe, lift the drill pipe to the ground, vertically insert the precast pile into the pile hole, use the inner hammer to lightly hit the precast pile to the pile top elevation +10cm, and lift the drill to the ground; complete the construction of the environmentally friendly enhanced carrier pile with the pile body as a precast pile; f. Or, take out the inner hammer of the drill pipe, pour a certain amount of fluid solidifying mud or soil solidifying agent or slurry or mortar or concrete solidifying material into the drill pipe, lift the drill pipe to the ground, vertically insert a steel pipe with a sealed pile tip at the bottom into the pile hole, use the inner hammer to tap the steel pipe to the pile top elevation +10cm, and then pour concrete into the steel pipe to complete the construction of the environmentally friendly enhanced carrier pile with steel pipe concrete as the pile body; g. When the design requires vertical compression piles, the pile body should enter the carrier at least 1 / 4 of the depth; h. When the design requires pull-out piles, the pile body should enter the carrier at least 1 / 2 depth.

2. The environmentally friendly reinforced carrier pile construction method according to claim 1 is characterized in that: It also includes the construction of environmentally friendly reinforced carrier piles with mixing and expansion: i. Repeat the construction steps S1-S4a; lift the drill to the preset stirring and expanding position, set the nozzle pressure of 1.0-20Mpa for different media such as gas and slurry or powder and slurry or powder and water or gas and powder, open the expansion blades to make the outer diameter equal to 1.5-2.5 times the pile diameter, and complete at least one or more re-spraying and re-stirring up and down according to the preset expansion height; retract the stirring blades, close the nozzle pressure to the minimum state, and complete the stirring and expanding; and the pile can be expanded at any one or more places; j. Continue to drill down to the preset depth, repeat steps S4b and S5, and complete the construction of the environmentally friendly reinforced carrier pile with mixing and diameter expansion.

3. The environmentally friendly reinforced carrier pile construction method according to claim 1 is characterized in that: It also includes the construction of environmentally friendly reinforced carrier piles with mixing and expanding tops; k. Repeat the construction steps S1-S4a, lift the drill to the top expansion position, set the nozzle pressure of 1.0-5.0Mpa for different media such as gas and slurry or powder and slurry or powder and water or gas and powder, open the wing expansion blades to make the outer diameter equal to 1.5-2.5 times the pile body diameter, and according to the preset top expansion height, complete at least one or more re-spraying and re-stirring up and down; retract the wing expansion blades, close the nozzle pressure to the minimum state, and complete the stirring and top expansion; 1. Repeat the construction steps S4b and S5 to complete the construction of the environmentally friendly reinforced carrier pile with mixing and top expansion.

4. The environmentally friendly reinforcement carrier pile construction method according to claim 1 is characterized in that: It also includes the construction of environmentally friendly reinforced carrier piles for mixing piles; m. Repeat steps S1-S4a, set the nozzle pressure of different media such as gas and slurry or powder and slurry or powder and water or gas and powder to 1.0-20Mpa, open the mixing blades to make the outer diameter equal to 1.5-2.5 times the diameter of the pile body, spray and stir while raising the drill to the pile top elevation at a uniform speed; continue to drill at least once or multiple times to complete the re-spraying and re-stirring to the preset depth, retract the wing expansion blades, close the nozzle pressure to the minimum state, and complete the mixing pile; n. Repeat steps S4b and S5 to complete the construction of the environmentally friendly reinforced carrier pile of the mixing pile.

5. The environmentally friendly reinforced carrier pile construction method according to claims 1 to 4 is characterized in that: It also includes solids, powders, slurries, mortars, concretes and fillers; The solidified material includes fluid solidified mud or soil solidifying agent or slurry or mortar or concrete; the strength of the solidified material is 1.0-20Mpa; The powder includes any one of a low-carbon cementitious material or a soil solidifying agent or a mixture of the two; the powder may also be added with a certain amount of admixture; The low-carbon cementitious material includes at least two or more mixtures of fly ash, steel slag, slag, vaporized slag, manganese slag, carbide slag, lithium slag, industrial by-gypsum, coal gangue, tailings, red mud, aluminum ash, fly ash, sludge, alkali slag and salt mud, etc., which are pre-treated by crushing, drying, thermal activation, physical activation and chemical activation to become ultra-fine powder with a specific surface area of ​​400-700 m2 / kg, replacing traditional cement, and the performance indicators meet or exceed those of cement; The admixtures include any one or a mixture of water reducing agent, early strength agent, retarder, air entraining agent, water repellent agent and expansion agent; The slurry comprises powder and water mixed together, and the water-cement ratio is 0.5-2.5; The mortar comprises a low-carbon cementitious material, recycled fine aggregate and water mixed together to form a fluid mixture; the mortar strength is M5-M30; The concrete is low-carbon concrete, which includes low-carbon cementitious materials, recycled aggregates, water, water-reducing agents and admixtures in a certain ratio, and the strength of the low-carbon concrete is C30-C200; The recycled aggregate includes any one or a mixture of coarse and fine aggregates of pre-treated solid wastes such as construction waste, waste stone, waste slag and tailings; The filler includes any one or a mixture of several of recycled aggregate, mortar mixture or dry hard concrete.

6. An environmentally friendly reinforced carrier pile, characterized in that: Includes reinforcement and rigid piles; The reinforcement includes a mixture of powder or slurry and soil, mortar or concrete; the strength of the reinforcement is 0.5-20Mpa; The reinforcement body includes any one or a combination of equal diameter, expanded top, expanded diameter and expanded bottom; the diameter of the reinforcement body is 1.5-2.5 times the diameter of the rigid pile; The rigid piles include plain concrete or reinforced concrete or precast piles or steel tube concrete; The diameter of the rigid pile is 300-2000 mm; The plain concrete or reinforced concrete may be in any one or a combination of equal diameter, expanded diameter, expanded top or expanded bottom.

7. The prefabricated pile according to claim 6, characterized in that: Including conventional precast piles and low-carbon precast piles; The conventional prefabricated piles and low-carbon prefabricated piles include solid piles, hollow piles, round piles, square piles and special-shaped piles in any composite form of non-prestressed steel bars, prestressed steel bars, prestressed non-prestressed composite bars and fiber composite bars; The low-carbon prefabricated piles include prefabricated piles formed by casting or centrifugation using low-carbon concrete made of low-carbon cementitious materials that replace cement and recycled aggregates that replace natural sand and gravel as main raw materials; The fiber composite reinforcement includes carbon fiber composite reinforcement and basalt fiber composite reinforcement; The prefabricated pile strength is C60-C200.

8. A construction device for environmentally friendly reinforced prefabricated piles, characterized in that: The device is used to execute the construction method described in any one of claims 1 to 7.

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