A construction method for a prestressed FRP bundle steel cylinder concrete pipe pile foundation structure

Abstract

The invention discloses a construction method for a prestressed FRP bundle steel cylinder concrete pipe pile foundation structure, comprising an internal prestressed concrete pipe pile, a sieve-hole steel pipe, concrete material, a steel cylinder, a zinc-aluminum alloy coating, a prestressed FRP bundle layer and a resin-rich layer; the invention provides the sieve-hole steel pipe so that the concrete can be mutually integrated through the circular holes on the pipe wall surface to form an internal structure similar to a bolt, thereby effectively improving the connection performance with the concrete and enhancing the shear bearing capacity of the structure; the resin-rich layer prepared by selecting and proportioning raw materials can not only beautify the product, but also protect the product from being damaged by the surrounding medium, improve its weather resistance, water resistance and corrosion resistance, and extend the service life of the product; the homogeneity of the concrete can be improved by adding an anti-corrosion and anti-erosion agent, so that corrosive substances are difficult to enter the interior of the concrete, and at the same time, the creep of the concrete can be reduced, and the anti-seepage ability and durability of the concrete can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of prestressed concrete pipe piles, and in particular to a construction method for a prestressed FRP bundle steel cylinder concrete pipe pile foundation structure. Background Art

[0002] In my country, prestressed concrete pipe piles have been widely used in various civil buildings, industrial buildings, railways, bridges and other projects, especially in civil buildings. They are widely recognized by the market for their advantages such as high single pile bearing capacity, wide design application range, low single pile bearing cost and fast construction speed.

[0003] However, it is subject to many limitations due to its poor resistance to horizontal force and poor corrosion resistance, especially in coastal areas, because the soil contains a large amount of chloride ions, which enter the concrete through penetration, diffusion and other means to reach the surface of the steel bars. When the chloride ion concentration on the surface of the steel bars reaches a critical value, the passivation film on the surface of the steel bars will be destroyed, causing corrosion of the steel bars and early damage to the structure, which loses the durability of the structure and has a great impact on the safety performance of the building. Therefore, the present invention proposes a construction method for a prestressed FRP bundle steel cylinder concrete pipe pile foundation structure to solve the problems existing in the prior art. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to propose a construction method for a prestressed FRP bundle steel cylinder concrete pipe pile foundation structure. The prestressed FRP bundle steel cylinder concrete pipe pile foundation structure and the construction method are provided with a sieve-shaped steel pipe so that during the pouring of concrete, the concrete can be mutually integrated through the circular holes on the surface of the pipe wall to form an internal structure similar to a bolt, which effectively improves the connection performance between the concrete and the concrete and enhances the shear bearing capacity of the structure; the resin-rich layer prepared by the selection and proportion of raw materials described in the present invention can not only beautify the product, but also protect the product from being invaded by the surrounding medium, improve its weather resistance, water resistance and corrosion resistance, and have the function of extending the service life of the product; the addition of anti-corrosion and anti-erosion agents can improve the homogeneity of the concrete, making it difficult for corrosive substances to enter the interior of the concrete, and at the same time can reduce the creep of the concrete, and improve the concrete's impermeability and durability.

[0005] To achieve the purpose of the present invention, the present invention is implemented through the following technical scheme: a prestressed FRP bundle steel cylinder concrete pipe pile foundation structure, including an internal prestressed concrete pipe pile, a sieve-type steel pipe, a concrete material, a steel cylinder, a zinc-aluminum alloy coating, a prestressed FRP bundle layer and a resin-rich layer, the internal prestressed concrete pipe pile is composed of a pile body, a steel cage and an end plate, the sieve-type steel pipe is evenly distributed with round holes, the concrete material is a mixture of concrete and an anti-corrosion and anti-corrosion agent, the anti-corrosion and anti-corrosion agent contains 45%-65% calcium metasilicate, 0.5%-6% plasticizer, 8%-10% light-burned magnesium oxide and silicon-aluminum material, the zinc-aluminum alloy coating has a ratio of 85% zinc and 15% aluminum, the prestressed FRP bundle layer is composed of a resin matrix and a bundle composite material, and the resin-rich layer is composed of a surface felt and a resin-rich agent.

[0006] Further improvements are: the end plate is a toroidal steel plate and a main anchor hole is provided on the equal-diameter circle in the middle of the toroid, the diameter of the steel cylinder is larger than the diameter of the sieve-type steel pipe, and the prestressed FRP bundle layer is wrapped around the steel cylinder in two directions to form a steel core FRP wrapped bundle.

[0007] A further improvement is that the calcium metasilicate component is wollastonite, the plasticizer is one or a mixture of two or more of polycarboxylic acid, aminosulfonic acid, naphthalene sulfonic acid, and melamine water reducers, and the silicon-aluminum material components are Al2O3 and SiO2.

[0008] A further improvement is that the resin-rich agent is mixed with 85-90% vinyl resin, 2-2.5% thixotropic agent, 0.1-0.3% propylene glycol, 1-1.2% ultraviolet absorber, 0.1-0.3% defoamer, 3-5% 250 mesh quartz sand, 2-4% color paste, 0.5-1% accelerator and 1-1.5% curing agent, wherein the vinyl resin adopts a resin with a viscosity of 1000-1500cps.

[0009] A further improvement is that the resin matrix components are epoxy resin, polyester and vinyl ester, and the bundled composite material components are a mixture of carbon fiber, aramid fiber and glass fiber.

[0010] A construction method for a prestressed FRP bundle steel cylinder concrete pipe pile foundation structure comprises the following steps:

[0011] Step 1: Prefabricate the internal prestressed concrete pipe piles by using the prestressing process and the centrifugal forming method. First, tie the steel cage, then use the truss crane to lift it into the prefabricated mold, then lift the sieve-type steel pipe to the outside of the steel cage, and finally lift the steel cylinder to the outside of the sieve-type steel pipe so that the three are concentrically arranged;

[0012] Step 2: After the steel cage, the sieve-type steel pipe and the steel cylinder are installed, a concentric mold cylinder is fixed inside the steel cage, and then the mold is hoisted into the concrete pouring area by a truss crane to pour concrete;

[0013] Step 3: tensioning, centrifugal forming, autoclaving and demoulding the pipe piles to form a steel cylinder concrete pipe pile foundation;

[0014] Step 4: The steel tube outside the steel tube concrete pile foundation is purified, that is, the burrs and flash on its surface are polished until the surface of the structural steel tube shows a uniform metallic luster;

[0015] Step 5: Arc spraying zinc-aluminum alloy coating, using arc as heat source, arc voltage controlled at 25-35V, working current adjusted to 150-200A, compressed air pressure controlled at about 0.6MPa, gas supply 3m³ / min, heating zinc-aluminum alloy to molten state, blowing zinc-aluminum alloy into mist with compressed gas, forming particle flow and spraying evenly on the substrate surface;

[0016] Step 6: Expose the sprayed concrete piles in the spraying workshop for 24 hours to allow the sprayed layer to fully oxidize with the air, so that the gaps in the sprayed layer are naturally closed;

[0017] Step 7: using the resin matrix and the bundle composite material to prepare a prestressed FRP bundle layer, and then winding multiple layers of circumferential and longitudinal prestressed FRP bundle layers on the outer surface of the steel cylinder to form a prestressed FRP bundle steel cylinder concrete pipe pile foundation;

[0018] Step 8. Wrap a layer of surface felt on the surface of the prestressed FRP bundle layer, spray the rich resin agent while wrapping, until the rich resin agent content of the surface felt reaches 90-95%, and then apply a 1.8-2.5mm thick layer of rich resin agent on the surface of the surface felt. At this point, the corrosion-resistant prestressed FRP bundle steel cylinder concrete pipe pile foundation structure is manufactured.

[0019] A further improvement is that the surface felt is 200 mm wide and is wound around the outside of the prestressed FRP bundle layer with a 20-30 mm overlap. The surface felt is wound with a resin-rich agent to form a resin-rich layer.

[0020] Further improvement is that the zinc-aluminum alloy coating is sprayed by layered spraying method, the thickness of each alloy film is uniformly 50μm, the previous layer and the next layer are sprayed vertically or 45 degrees cross-sprayed, adjacent spraying areas should overlap 1 / 3 of the width, and the time interval between layered spraying shall not exceed 2h.

[0021] The beneficial effects of the present invention are as follows: the present invention arranges the mesh steel pipe so that during the pouring of concrete, the concrete can be mutually integrated through the circular holes on the surface of the pipe wall to form an internal structure similar to a bolt, which effectively improves the connection performance with the concrete and enhances the shear bearing capacity of the structure; the resin-rich layer prepared by the selection and proportion of raw materials described in the present invention can not only beautify the product, but also protect the product from being invaded by the surrounding medium, improve its weather resistance, water resistance and corrosion resistance, and have the function of extending the service life of the product; the addition of anti-corrosion and anti-erosion agents can improve the homogeneity of concrete, making it difficult for corrosive substances to enter the interior of the concrete, and at the same time can reduce the creep of concrete, and improve the concrete's impermeability and durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the present invention.

[0023] Figure 2 It is a three-dimensional structural diagram of the pile body of the present invention.

[0024] Figure 3 It is a plan view of the end plate of the present invention.

[0025] Figure 4 It is a cross-sectional view of the sieve-type steel pipe of the present invention.

[0026] Among them: 1. Internal prestressed concrete pipe piles; 2. Sieve-type steel pipes; 3. Concrete materials; 4. Steel cylinders; 5. Zinc-aluminum alloy coatings; 6. Resin matrix; 7. Bundled composite materials; 8. Surface felt; 9. Resin-rich agent; 10. Steel cage; 11. Round holes; 12. End plates; 13. Main anchor holes. DETAILED DESCRIPTION

[0027] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0028] according to Figure 1 , 2As shown in Figures 3 and 4, this embodiment provides a prestressed FRP bundle steel cylinder 4 concrete pipe pile foundation, comprising an internal prestressed concrete pipe pile 1, a sieve-type steel pipe 2, a concrete material 3, a steel cylinder 4, a zinc-aluminum alloy coating 5, a prestressed FRP bundle layer and a resin-rich layer, wherein the internal prestressed concrete pipe pile 1 is composed of a pile body, a steel cage 10 and an end plate 12, and circular holes 11 are evenly distributed on the sieve-type steel pipe 2. The sieve-type steel pipe 2 is a steel pipe structure with circular holes 11 opened at intervals in a local section of the pipe wall surface, and the concrete material 3 is a mixture of concrete and an anti-corrosion and anti-corrosion agent, wherein the anti-corrosion and anti-corrosion agent comprises 45%-65% calcium metasilicate, 0.5%-6% plasticizer, 8%-10% light-burned magnesium oxide and silicon-aluminum material, and the prepared concrete anti-corrosion and anti-corrosion agent is added to cement or cementitious material, and the amount of the added concrete anti-corrosion and anti-corrosion agent is 0.1-10.0wt% of the total amount of cement or cementitious material.

[0029] The zinc-aluminum alloy coating 5 has a ratio of 85% zinc and 15% aluminum. This ratio not only makes the Zn-Al composite material coating have the characteristics of pure Zn coating for effective anodic protection of steel pipes and insensitivity to corrosion, but also because the coating contains enough Al, it can form a complete Al2O3 protective film to resist corrosion.

[0030] The prestressed FRP bundle layer is composed of a resin matrix 6 and a bundle composite material 7. The fibers are first fixed together by an extrusion molding process, then passed through the resin matrix 6 dipping tank, and then pulled out by a molding die. The bundled product finally passes through a curing chamber to allow the resin to harden in the chamber. The resin-rich layer is composed of a surface felt 8 and a resin-rich agent 9.

[0031] The end plate 12 is an annular steel plate and a main anchor hole 13 is provided on the equal-diameter circle in the middle of the annulus. The diameter of the steel cylinder 4 is larger than the diameter of the sieve-type steel pipe 2. The prestressed FRP bundle layer is wrapped around the steel cylinder 4 in two directions to form a steel core FRP wrapped bundle. The surface of the prestressed FRP bundle layer is striped or granular, which improves the bonding strength with the steel cylinder 4.

[0032] The calcium metasilicate component is wollastonite, the plasticizer is one or a mixture of two or more of polycarboxylic acid, aminosulfonic acid, naphthalene sulfonic acid, and melamine water reducers, and the silicon-aluminum material components are Al2O3 and SiO2.

[0033] The resin-rich agent 9 is mixed with 85-90% vinyl resin, 2-2.5% thixotropic agent, 0.1-0.3% propylene glycol, 1-1.2% ultraviolet absorber, 0.1-0.3% defoamer, 3-5% 250 mesh quartz sand, 2-4% color paste, 0.5-1% accelerator and 1-1.5% curing agent, wherein the vinyl resin adopts a resin with a viscosity of 1000-1500cps, which has the functions of good corrosion resistance, water resistance, weather resistance, can be cured at room temperature, and has excellent process performance.

[0034] The resin matrix 6 is composed of epoxy resin, polyester and vinyl ester, and its main function is to provide lateral support for the fibers and protect the fibers from physical and chemical corrosion in the surrounding environment; the bundled composite material 7 is a mixture of carbon fiber, aramid fiber and glass fiber, and has the advantages of corrosion resistance and fatigue resistance.

[0035] A construction method for a prestressed FRP bundle steel cylinder concrete pipe pile foundation structure comprises the following steps:

[0036] Step 1: Prefabricate the internal prestressed concrete pipe pile 1 by using the prestressing process and the centrifugal forming method. First, tie the steel cage 10, then use the truss crane to lift it into the prefabricated mold, then lift the sieve-type steel pipe 2 to the outside of the steel cage 10, and finally lift the steel cylinder 4 to the outside of the sieve-type steel pipe 2 so that the three are concentrically arranged;

[0037] Step 2: After the steel cage 10, the sieve-type steel pipe 2 and the steel cylinder 4 are installed, a concentric mold cylinder is fixed inside the steel cage 10, and then the mold is hoisted into the concrete pouring area by a truss crane to pour concrete;

[0038] Step 3: tensioning, centrifugal forming, autoclaving and demoulding the pipe piles to form a steel cylinder 4 concrete pipe pile foundation;

[0039] Step 4: The steel tube 4 on the outside of the concrete pile foundation is cleaned, that is, the burrs and flash on its surface are polished until the surface of the structural steel tube shows a uniform metallic luster;

[0040] Step 5: arc spraying the zinc-aluminum alloy coating 5, using the arc as the heat source, the arc voltage is controlled at 25-35V, the working current is adjusted to 150-200A, the compressed air pressure is controlled at about 0.6MPa, the air supply volume is 3m³ / min, the zinc-aluminum alloy is heated to a molten state, and the zinc-aluminum alloy is blown into a mist with compressed gas to form a particle flow that is evenly sprayed on the substrate surface;

[0041] Step 6: Expose the sprayed concrete piles in the spraying workshop for 24 hours to allow the sprayed layer to fully oxidize with the air, so that the gaps in the sprayed layer are naturally closed;

[0042] Step 7: prepare a prestressed FRP bundle layer using the resin matrix 6 and the bundle composite material 7, and then wind multiple layers of prestressed FRP bundle layers in circumferential and longitudinal directions on the outer surface of the steel cylinder 4 to form a prestressed FRP bundle steel cylinder concrete pipe pile foundation;

[0043] Step 8, first wrap a layer of surface felt 8 on the surface of the prestressed FRP bundle layer, and spray the rich resin agent 9 while wrapping until the rich resin agent 9 content of the surface felt 8 reaches 90-95%, and then apply a 1.8-2.5mm thick layer of rich resin agent 9 on the surface of the surface felt 8. At this point, the corrosion-resistant prestressed FRP bundle steel tube 4 concrete pipe pile foundation is manufactured.

[0044] The width of the surface felt 8 is 200 mm. The surface felt 8 is wound around the outer side of the prestressed FRP bundle layer by a 20-30 mm overlap treatment method. The surface felt 8 is wound while being wound with the resin-rich agent 9 to form a resin-rich layer.

[0045] The zinc-aluminum alloy coating 5 is sprayed by layered spraying. The thickness of each alloy film is uniformly 50 μm. The previous layer and the next layer are sprayed vertically or cross-sprayed at 45 degrees. The adjacent spraying areas should overlap by 1 / 3 of the width. The time interval between layered spraying shall not exceed 2 hours.

[0046] The prestressed FRP bundle steel cylinder concrete pipe pile foundation structure and construction method are provided with a sieve-shaped steel pipe so that during the pouring of concrete, the concrete can be mutually integrated through the circular holes on the surface of the pipe wall to form an internal structure similar to a bolt, which effectively improves the connection performance between the concrete and the concrete and enhances the shear bearing capacity of the structure; the resin-rich layer prepared by the selection and proportion of raw materials described in the present invention can not only beautify the product, but also protect the product from being invaded by the surrounding medium, improve its weather resistance, water resistance and corrosion resistance, and have the function of extending the service life of the product; the addition of anti-corrosion and anti-erosion agents can improve the homogeneity of the concrete, make it difficult for corrosive substances to enter the interior of the concrete, and at the same time reduce the creep of the concrete, and improve the concrete's impermeability and durability.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A construction method for a prestressed FRP bundle steel cylinder concrete pipe pile foundation structure, characterized in that: The structure of the method comprises an internal prestressed concrete pipe pile (1), a mesh steel pipe (2), a concrete material (3), a steel cylinder (4), a zinc-aluminum alloy coating (5), a prestressed FRP bundle layer and a resin-rich layer. The internal prestressed concrete pipe pile (1) is composed of a pile body, a steel cage (10) and an end plate (12). The mesh steel pipe (2) is evenly provided with round holes (11). The concrete material (3) is a mixture of concrete and an anti-corrosion and anti-erosion agent. The anti-corrosion and anti-erosion agent comprises 45%-65% calcium metasilicate, 0.5%-6% plasticizer, 8%-10% lightly burned magnesium oxide and silicon-aluminum material. The zinc-aluminum alloy coating (5) has a ratio of 85% zinc and 15% aluminum. The prestressed FRP bundle layer is composed of a resin matrix (6) and a bundle composite material (7). The resin-rich layer is composed of a surface felt (8) and a resin-rich agent (9). The resin-rich agent (9) is prepared by mixing 85-90% of vinyl resin, 2-2.5% of thixotropic agent, 0.1-0.3% of propylene glycol, 1-1.2% of ultraviolet absorber, 0.1-0.3% of defoamer, 3-5% of 250-mesh quartz sand, 2-4% of color paste, 0.5-1% of accelerator and 1-1.5% of curing agent, wherein the vinyl resin has a viscosity of 1000-1500 cps; The following steps are involved: Step 1: Prefabricate the internal prestressed concrete pipe pile (1) by using the prestressing process and the centrifugal forming method, first tie the steel cage (10), then use a truss crane to lift it into the prefabricated mold, then lift the sieve-type steel pipe (2) to the outside of the steel cage (10), and finally lift the steel cylinder (4) to the outside of the sieve-type steel pipe (2) so that the three are concentrically arranged; Step 2: After the steel cage (10), the sieve-type steel pipe (2) and the steel cylinder (4) are installed, a concentric mold cylinder is fixed inside the steel cage (10), and then the mold is hoisted into the concrete pouring area by a truss crane to perform concrete pouring; Step 3: After the concrete pouring is completed, the pipe pile is tensioned, centrifugally formed, autoclaved and cured, and demoulding is performed to form a steel cylinder (4) concrete pipe pile foundation; Step 4: Steel Cylinder (4) The steel cylinder (4) outside the concrete pile foundation is cleaned, that is, the burrs and flash on its surface are polished until the surface of the structural steel tube shows a uniform metallic luster; Step 5: arc spraying zinc-aluminum alloy coating (5), using arc as heat source, arc voltage controlled at 25-35V, working current adjusted to 150-200A, compressed air pressure controlled at 0.6MPa, air supply volume 3m 3 / min, the zinc-aluminum alloy is heated to a molten state, and the zinc-aluminum alloy is blown into a mist with compressed gas to form a particle flow that is evenly sprayed on the substrate surface; Step 6: Expose the sprayed concrete piles in the spraying workshop for 24 hours to allow the sprayed layer to fully oxidize with the air, so that the gaps in the sprayed layer are naturally closed; Step 7: using the resin matrix (6) and the bundle composite material (7) to prepare a prestressed FRP bundle layer, and then winding multiple layers of circumferential and longitudinal prestressed FRP bundle layers on the outer surface of the steel cylinder (4) to form a prestressed FRP bundle steel cylinder concrete pipe pile foundation; Step 8: Firstly, a layer of surface felt (8) is wound on the surface of the prestressed FRP bundle layer, and a rich resin agent (9) is sprayed while winding until the content of the rich resin agent (9) on the surface felt (8) reaches 90-95%, and then a layer of rich resin agent (9) with a thickness of 1.8-2.5 mm is coated on the surface of the surface felt (8), and thus, the corrosion-resistant prestressed FRP bundle steel cylinder concrete pipe pile foundation structure is manufactured; The surface felt (8) has a width of 200 mm, and is wound around the outer side of the prestressed FRP bundle layer by a 20-30 mm overlap treatment method. The surface felt (8) is wound while being wound with a resin-rich agent (9) to form a resin-rich layer; The zinc-aluminum alloy coating (5) is sprayed by a layered spraying method, and the thickness of each layer of the alloy film is uniformly 50 μm. The previous layer and the next layer are sprayed vertically or cross-sprayed at 45 degrees. The adjacent spraying areas must overlap by 1 / 3 of the width, and the time interval between the layered spraying shall not exceed 2 hours.

2. The construction method of a prestressed FRP bundle steel cylinder concrete pipe pile foundation structure according to claim 1, characterized in that: The end plate (12) is a toroidal steel plate and a main anchor bar hole (13) is provided on a circle of equal diameter in the middle of the toroid. The diameter of the steel cylinder (4) is larger than the diameter of the sieve-type steel pipe (2). The prestressed FRP bundle layer is wound around the steel cylinder (4) in two directions to form a steel core FRP wrapped bundle.

3. The construction method of a prestressed FRP bundle steel cylinder concrete pipe pile foundation structure according to claim 1, characterized in that: The calcium metasilicate component is wollastonite, and the plasticizer is polycarboxylic acid, aminosulfonic acid, naphthalene sulfonic acid, melamine One or a mixture of two or more of the water reducing agent, wherein the silicon-aluminum material components are Al2O3 and SiO2.

4. The construction method of a prestressed FRP bundle steel cylinder concrete pipe pile foundation structure according to claim 1, characterized in that: The resin matrix (6) comprises epoxy resin, polyester and vinyl ester, and the bundled composite material (7) comprises a mixture of carbon fiber, aramid fiber and glass fiber.

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