Anti-seismic square pile for chemical powder production device

Abstract

The anti-seismic square pile for the chemical powder production device comprises a square-section pile body, an internal prestressed reinforcement cage and a fiber concrete outer layer, the internal prestressed reinforcement cage and the fiber concrete outer layer are sequentially arranged on the outer side of the square-section pile body, and the pile top and the pile bottom are provided with a tenon-and-mortise connecting part and a tenon-and-mortise connecting groove which are used in a matched mode respectively. The mortise and tenon connecting part comprises a connecting block and a high-strength bolt, the connecting block is fixed to the pile top through the bolt, and the shape of the connecting block is matched with that of the mortise and tenon connecting groove. According to the anti-seismic square pile for the chemical powder production device, the vertical compression bearing capacity of a single pile is improved compared with that of a traditional pile, the elastic state is still kept when the interlayer displacement angle reaches 1 / 65-1 / 50, and therefore the anti-seismic performance is improved, the steam consumption is greatly reduced in the production process, the maintenance period is greatly shortened, and energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of square piles, and in particular to an earthquake-resistant square pile for a chemical powder production device. Background Art

[0002] Propylene can be used to produce a variety of basic organic raw materials, such as propylene oxide, acrolein, allyl alcohol, isopropyl alcohol, carbon tetrachloride, butanol, and more. In recent years, driven by demand for downstream derivatives (especially polypropylene), the demand for propylene has increased significantly. In the fiercely competitive international market, the development of propylene and its derivatives requires the use of the most advanced, environmentally friendly processes and technologies to achieve low-cost, large-scale economies of scale. Aiming at the development prospects of propylene in China, China Tianchen Engineering Co., Ltd. has developed a methanol-to-olefins catalyst, primarily a chemical powder based on a silicon-aluminum-phosphorus molecular sieve. This chemical powder can achieve a methanol conversion rate of 100% or near 100%, with selectivity for ethylene and propylene exceeding 78%, and virtually no products above C5. Its outstanding hydrothermal stability and suitable pore structure further enhance its performance, making it poised for widespread application in the future.

[0003] Concrete square piles, one of the main forms of building pile foundations for chemical powder production equipment, are widely used in geological conditions such as soft soil and liquefied soil. However, existing square piles have significant flaws: traditional piles use a uniform cross-section design, resulting in sudden changes in stiffness between the pile body and the connection. This can lead to stress concentration and fracture during earthquakes (damage occurs when the interlayer displacement angle is greater than 1 / 30); the connection between the pile top and the pedestal relies on ordinary bolts, which have insufficient pullout strength and are difficult to meet earthquake and pullout resistance requirements; the production process relies on traditional steam curing (energy consumption ≥800kg standard coal per batch, cycle ≥24 hours), resulting in high carbon emissions and low efficiency; the material relies solely on the strength of concrete, without combining fiber reinforcement and prestressing. These problems restrict the application of square piles in real-world working conditions. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the present invention provides an earthquake-resistant square pile for a chemical powder production device.

[0005] An earthquake-resistant square pile for a chemical powder production device comprises: a square-section pile body, an internal prestressed steel cage and a fiber concrete outer layer sequentially arranged on the outside of the square-section pile body, wherein the pile top and pile bottom are respectively provided with a mortise and tenon joint portion and a mortise and tenon joint groove for use together to connect the pile top and pile bottom; wherein the fiber concrete outer layer is prepared from the following raw materials in parts by weight: 125-135 parts of crushed stone, 350-480 parts of medium-coarse sand, 210-250 parts of Portland cement, 50-70 parts of sulfoaluminate cement, 0.5-1.0 parts of nano-silicon dioxide, 18-35 parts of silica fume, 20-38 parts of anhydrite, 98-102 parts of polycarboxylic acid high-efficiency water-reducing agent, 0.3-0.8 parts of organosilicon water-repellent, 70-80 parts of polypropylene alcohol fiber, 20-30 parts of polybutene fiber, 16-26 parts of industrial aluminum sulfate, 1-5 parts of sodium lauryl sulfate, and 14-25 parts of sulfoaluminate clinker.

[0006] Crushed stone and medium-coarse sand are used as the aggregate system, and the aggregate gradation satisfies the continuous gradation curve.

[0007] Portland cement and sulphoaluminate cement are used as the cementitious system. Their combined use allows the hydration products to form a double network structure of CSH gel and ettringite (AFt). Portland cement provides early strength, while sulphoaluminate cement generates expansive substances to compensate for shrinkage and prevent cracking, solving the problem of traditional concrete being prone to shrinkage cracking and making the piles stronger.

[0008] Nano-silica, silica fume, and anhydrite (CaSO4·1 / 2H2O) are used as functional fillers. Among them, nano-silica needs to be surface-modified by a silane coupling agent (KH-550) to increase the interfacial binding energy by ≥40%.

[0009] Polycarboxylate water-reducing agent and organosilicon water-repellent agent are compounded and used as an admixture system, with a water reduction rate of ≥35% and a concrete shrinkage ratio of ≤125%.

[0010] Polypropylene alcohol fiber and polybutene fiber are used as reinforcing phase.

[0011] Industrial aluminum sulfate and sulfoaluminate clinker synergistically generate early-strength ettringite, which increases the 1d compressive strength by ≥40%.

[0012] Furthermore, the crushed stone particle size is continuously graded from 5 to 25 mm, the crushed stone needle-shaped particle content is ≤5%, the sand and mud content is ≤1.5%, and the mud block content is ≤0.5%;

[0013] and / or medium coarse sand with a fineness modulus of 2.6-3.0, Portland cement with PO 42.5R, nanosilica D 50 =10-20nm, silica fume specific surface area ≥20000m 2 / kg, the solid content of polycarboxylate superplasticizer is 20%;

[0014] The length of the polypropylene alcohol fiber is 12-15 mm and the diameter is 30-50 μm; the diameter of the polybutene fiber is 18-22 μm and the length is 12-30 mm.

[0015] Polypropylene alcohol (PVA) fibers primarily provide tensile strength and toughness, inhibiting early plastic cracking in concrete. Longer fibers (12-15 mm) can effectively bridge microcracks, creating a "bridging effect" and improving crack resistance. Fibers that are too short (<12 mm) are less effective at bridging, while fibers that are too long (>15 mm) tend to clump, affecting dispersion uniformity. Typical PVA fiber diameters range from 30-50 μm.

[0016] Polybutylene fiber (PB fiber) primarily enhances concrete's seismic energy dissipation capacity by absorbing seismic energy through plastic deformation of fine fibers. Thin fibers (18-22 μm) are more flexible, creating more plastic hinges and slowing crack propagation. Fibers that are too thick (e.g., >22 μm) are more brittle and less effective at dissipating energy; while fibers that are too thin (<18 μm) are prone to breakage, reducing long-term stability. PB fibers are typically 12-30 mm in length.

[0017] Furthermore, the mass ratio of Portland cement to sulphoaluminate cement is (3.5-4.5):1, and the mass ratio of nano-silica to silica fume is 1:(21-29);

[0018] and / or the volume ratio of polypropylene alcohol fiber to polybutylene fiber is (3.5-4):1, and the total amount of the two fibers is controlled to be 0.5-1.2 vol.% of the total volume of the raw materials;

[0019] And / or the mass ratio of industrial aluminum sulfate to sulfoaluminate clinker is (1-1.5):1.

[0020] The synergistic effect of nano-silica and silica fume directly affects the microstructure (such as the double network structure of hydration products) and mechanical properties (such as compressive strength, impermeability, and crack resistance) of concrete, and needs to be strictly controlled; the dosage of anhydrite is usually adjusted according to the type of cement and process requirements, and the change in its proportion within a certain range (such as 20-38 parts) has little effect on the final performance.

[0021] Nano-silica (SiO2), as an ultrafine active filler, is mainly modified by silane coupling agent to improve the interfacial binding energy, enhance the bonding strength between the cement matrix and the fiber, and improve the crack resistance.

[0022] Silica fume (SiO2 powder), which has pozzolanic activity, reacts with cement hydration products to form CSH gel, which fills pores and increases density while compensating for shrinkage.

[0023] Anhydrite (CaSO4·1 / 2H2O), as an auxiliary mineral admixture, mainly functions to adjust the setting time and refine the pore structure, but its activity is low and its direct effect on mechanical properties is weak.

[0024] Furthermore, the side length of the square cross-section pile ranges from 200mm to 1800mm, and the wall thickness is 1 / 8 to 1 / 6 of the side length.

[0025] Furthermore, the prestressed steel cage is formed into a cage shape by a plurality of longitudinal steel bars and a plurality of annular stirrups. The longitudinal steel bars are HRB500E and above, and the prestressing force is 300-500kN.

[0026] Furthermore, the mortise and tenon joint includes a connection block and high-strength bolts, the connection block is fixed to the pile top by the bolts, and the shape of the connection block matches the shape of the mortise and tenon joint groove;

[0027] Preferably, the mortise and tenon joint further comprises an embedded steel plate having a thickness of 8-12 mm, which is welded and fixed to the prestressed steel bar and has a surface treated by sandblasting.

[0028] Furthermore, the prestressed steel cage further comprises spiral stirrups, which are spirally wound around the outside of the cage structure formed by the longitudinal steel bars and the annular stirrups.

[0029] Furthermore, the bolts are of M24-M36 specifications, made of 42CrMo alloy steel, with a preload range of 250-400kN, and are used in conjunction with epoxy resin adhesive.

[0030] Epoxy resin adhesive is used for interfacial bonding between high-strength bolts and embedded steel plates and pile concrete, and is an auxiliary material for bolt connections.

[0031] Fill the gap between the bolt and the threaded hole with adhesive to prevent the bolt from loosening due to vibration; isolate moisture and corrosive media to extend the service life of the bolt; improve the bonding strength between the bolt and concrete or steel to avoid connection failure caused by interface debonding.

[0032] Furthermore, there are three connecting blocks, namely two I-shaped connecting blocks and one L-shaped connecting block. The L-shaped connecting block is located at the angle of the pile top, and the two I-shaped connecting blocks are located on both sides of the L-shaped connecting block. One end or both ends of the connecting block are provided with an inclined surface, and the inclination angle of the inclined surface is 5°-8°.

[0033] Furthermore, stiffening rings are arranged at intervals along the axial direction of the prestressed steel cage, with a thickness of 50-80 mm and a spacing of 200-600 mm.

[0034] Furthermore, an elastic shock-absorbing layer is added to the mortise and tenon joint at the pile end. The elastic shock-absorbing layer is made of polyurethane or rubber material, has a thickness of 20-30 mm, and a compressive strength of ≥20 MPa.

[0035] Furthermore, the fiber concrete outer layer mix ratio meets the requirements of water-binder ratio ≤ 0.28, chloride ion content ≤ 0.06%, and alkali content ≤ 3.0 kg / m 3 , sulfate resistance grade ≥KS120.

[0036] Advantages and beneficial effects of the present invention:

[0037] The vertical compressive bearing capacity of the seismic-resistant square pile for chemical powder production equipment described in the present invention is improved compared with traditional piles. The pile still maintains an elastic state when the inter-story displacement angle reaches 1 / 65-1 / 50, thereby improving the seismic performance. In addition, the steam consumption and the maintenance cycle are greatly reduced during the production process, thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0039] Figure 1 This is a diagram of the connection structure of the earthquake-resistant square piles used in the chemical powder production device according to the present invention.

[0040] Figure 2 This is a diagram of the internal structure of the earthquake-resistant square piles used in a chemical powder production device according to the present invention.

[0041] Reference numerals:

[0042] 1. Square cross-section pile body; 2. Longitudinal reinforcement; 3. Annular stirrups; 4. Fiber concrete outer layer; 5. Embedded steel plate; 6. Mortise and tenon joint; 61. Connecting block; 62. Bolt; 7. Mortise and tenon joint groove; 8. Stiffening ring. DETAILED DESCRIPTION

[0043] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0044] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0045] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. Exemplary representations of the above terms in this specification are not necessarily directed to the same embodiment or example. Moreover, the described particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0046] Embodiment 1

[0047] A square pile for a chemical powder production device, comprising:

[0048] The square pile body has a side length ranging from 600 mm and a wall thickness of 1 / 6 of the side length. The pile top and the pile bottom are respectively provided with a mortise and tenon joint and a mortise and tenon joint groove for cooperation. The mortise and tenon joint comprises a connecting block and a bolt. The connecting block is fixed to the pile top by the bolt. The shape of the connecting block matches the shape of the mortise and tenon joint groove. Specifically, the connecting block is three, two of which are one-piece connecting blocks and one of which is an L-shaped connecting block. The L-shaped connecting block is located at the corner of the pile top, and the two one-piece connecting blocks are respectively located on the two sides of the L-shaped connecting block. One end or both ends of the connecting block are provided with an inclined surface, and the inclination angle of the inclined surface is 5°-8°. The mortise and tenon joint further comprises a pre-embedded steel plate with a thickness of 8 mm, which is welded and fixed with the prestressed steel cage and is sandblasted on the surface. The bolt is M24-M36 in size and is made of 42CrMo alloy steel. The pre-tightening force ranges from 250 to 400 kN, and is matched with an epoxy resin adhesive. The prestressed steel cage is provided with a stiffening ring along the axial direction at intervals. The stiffening ring has a thickness of 50 mm and a spacing of 200 mm. The pile end mortise and tenon joint is additionally provided with an elastic shock absorbing layer made of polyurethane or rubber material with a thickness of 20 mm and a compressive strength of ≥20Mpa.

[0049] The internal prestressed steel cage is formed by a plurality of longitudinal steel bars and a plurality of ring stirrups. The longitudinal steel bars are HRB500E and above, and the pre-tensioning force is 350 kN.

[0050] The prestressed steel cage can further comprise a spiral stirrup which is spirally wrapped outside the cage structure formed by the longitudinal steel bars and the ring stirrups.

[0051] The fiber concrete outer layer is prepared from the following raw materials in parts by weight: 125 parts of crushed stone, 355 parts of medium-coarse sand, 210 parts of silicate cement, 50 parts of sulfoaluminate cement, 0.8 parts of nano-silica, 21 parts of silica fume, 21 parts of anhydrite, 98 parts of polycarboxylic acid high-efficiency water reducer, 0.3 parts of silicone water repellent, 70 parts of polypropylene alcohol fiber, 20 parts of polybutene fiber, 17 parts of industrial aluminum sulfate, 1 part of sodium lauryl sulfate, and 16 parts of sulfoaluminate clinker.

[0052] The crushed stone particle size is 5-25mm continuous grading, the crushed stone needle-shaped particle content is ≤5%, the sand mud content is ≤1.5%, the mud block content is ≤0.5%, the fineness modulus of medium-coarse sand is 2.6-3.0, the silicate cement is PO 42.5R, and the nano-silica D 50 =15nm, silica fume specific surface area ≥20000m 2 / kg, the solid content of polycarboxylate superplasticizer is 20%, the length of polypropylene alcohol fiber is 12mm, the diameter is 30 μm The diameter of the polybutene fiber is 18 μm and the length is 13 mm .

[0053] The fiber concrete outer layer mix ratio meets the requirements of water-binder ratio 0.27, chloride ion content 0.05%, and alkali content 2.8kg / m 3 , sulfate resistance grade KS130.

[0054] When the square pile is in use, the upper and lower square piles are connected and fixed by the mortise and tenon structure, and the mortise and tenon connection grooves at the bottom of the upper square pile are used in conjunction with the connection blocks at the bottom of the lower square pile to achieve the connection and fixation of the two square piles.

[0055] Example 2

[0056] An earthquake-resistant square pile for a chemical powder production device, comprising:

[0057] The pile body has a square cross-section, a side length of 1000mm, and a wall thickness of 1 / 8 of the side length; the pile top and pile bottom are respectively provided with a mortise and tenon connection part and a mortise and tenon connection groove for use together, the mortise and tenon connection part includes a connection block and a bolt, the connection block is fixed to the pile top by bolts, and the shape of the connection block matches the shape of the mortise and tenon connection groove. Specifically, there are three connection blocks, namely two straight connection blocks and one L-shaped connection block. The L-shaped connection block is located at the angle of the pile top, and the two straight connection blocks are located on both sides of the L-shaped connection block. One end or both ends of the connection block are provided with an inclined surface, and the inclination angle of the inclined surface is 5°- 8°; the mortise and tenon joint also includes a pre-buried steel plate with a thickness of 10mm, which is welded to the prestressed steel cage and has a sandblasted surface. The bolts are M24-M36 in size, made of 42CrMo alloy steel, with a preload range of 250-400kN, and are used in conjunction with epoxy resin adhesive. Stiffening rings are set axially along the upper edge of the prestressed steel cage, with a thickness of 60mm and a spacing of 400mm. The mortise and tenon joint at the pile end is equipped with an elastic shock-absorbing layer made of polyurethane or rubber material, with a thickness of 24mm and a compressive strength of ≥20Mpa.

[0058] The internal prestressed steel cage is formed by a number of longitudinal steel bars and a number of annular stirrups. The longitudinal steel bars are HRB600 with a pre-tensioning force of 420kN.

[0059] The prestressed steel cage may further include spiral stirrups, which are spirally wound around the outside of the cage structure formed by the longitudinal steel bars and the annular stirrups.

[0060] The fiber concrete outer layer is prepared from the following raw materials in parts by weight: 130 parts of crushed stone, 410 parts of medium-coarse sand, 230 parts of silicate cement, 62 parts of sulfoaluminate cement, 1.0 part of nano-silica, 29 parts of silica fume, 25 parts of anhydrite, 98-102 parts of polycarboxylic acid high-efficiency water reducer, 0.5 parts of silicone water repellent, 75 parts of polypropylene alcohol fiber, 22 parts of polybutene fiber, 23 parts of industrial aluminum sulfate, 2 parts of sodium lauryl sulfate, and 21 parts of sulfoaluminate clinker.

[0061] The crushed stone particle size is 5-25mm continuous grading, the crushed stone needle-shaped particle content is ≤5%, the sand mud content is ≤1.5%, the mud block content is ≤0.5%, the fineness modulus of medium-coarse sand is 2.6-3.0, the silicate cement is PO 42.5R, and the nano-silica D 50 =15nm, silica fume specific surface area ≥20000m 2 / kg, the solid content of polycarboxylic acid high-efficiency water-reducing agent is 20%, the length of polypropylene alcohol fiber is 13mm, the diameter is 37 μm The diameter of the polybutene fiber is 20 μm and the length is 22 mmThe fiber concrete outer layer mix ratio meets the requirements of water-binder ratio 0.26, chloride ion content 0.04%, and alkali content 2.7kg / m 3 , sulfate resistance grade KS140.

[0062] Control group: traditional square pile

[0063] Configuration: Ordinary Portland cement (PO42.5), no fiber reinforcement, ordinary prestressed steel bars (HRB400), no mortise and tenon joints.

[0064] Test results:

[0065] 1. Vertical compressive bearing capacity

[0066] The vertical compressive bearing capacity of a single traditional square pile is 2300 kN, while that of the square pile of the present invention is 2800-2950 kN, which is increased by 21-28%.

[0067] 2. Earthquake resistance test

[0068] When the earthquake acceleration is 0.1g, the interlayer displacement angle of the traditional square pile is 1 / 200, while that of the square pile of the present invention is 1 / 1000-1 / 800; when the earthquake acceleration is 0.2g, the interlayer displacement angle of the traditional square pile is 1 / 100, while that of the square pile of the present invention is 1 / 600-1 / 500; when the earthquake acceleration is 0.4g, the interlayer displacement angle of the traditional square pile is 1 / 35, indicating destruction, while that of the square pile of the present invention is 1 / 65-1 / 50, indicating an elastic state.

[0069] Comparative Example 1

[0070] The difference from the above-mentioned Example 1 is that the mass ratio of Portland cement to sulphoaluminate cement exceeds the given range, specifically 200 parts of Portland cement and 70 parts of sulphoaluminate cement, and the other materials are the same as those in Example 1.

[0071] Test results:

[0072] The compressive strength decreased to 2200 kN, the concrete shrinkage increased, and the interlayer displacement angle reached 1 / 30 (failure) at 0.4 g.

[0073] Comparative Example 2

[0074] The difference from the above-mentioned Example 1 is that the mass ratio of nano-silicon dioxide to silica fume exceeds the given range, specifically 0.2 parts of nano-silicon dioxide and 36 parts of silica fume, and other materials are the same as those in Example 1.

[0075] Test results:

[0076] The interfacial modification effect of nano-silica weakened, the bonding strength between fiber and concrete decreased, and the sulfate resistance grade dropped to KS90.

[0077] Comparative Example 3

[0078] The difference from the above-mentioned embodiment 1 is that only polypropylene alcohol fiber is used, and other materials are the same as those in embodiment 1.

[0079] Test results:

[0080] It lacks the plastic energy dissipation capacity of polybutene fiber, the interlayer displacement angle reaches 1 / 100 at 0.2g (insufficient elasticity), the fatigue resistance decreases, and the residual deformation increases to 3‰ after 200 cycles.

[0081] Comparative Example 4

[0082] The difference from the above-mentioned embodiment 1 is that only polybutene fiber is used, and other materials are the same as those in embodiment 1.

[0083] Test results:

[0084] The long fiber bridging effect of polypropylene alcohol fiber is lost, the macro crack resistance is reduced, and the inter-story displacement angle under a 0.4g earthquake reaches 1 / 60 (insufficient toughness).

[0085] Comparative Example 5

[0086] The difference from the above-mentioned Example 1 is that the mass ratio of industrial aluminum sulfate to sulfoaluminate clinker exceeds the given range, specifically 30 parts of industrial aluminum sulfate and 10 parts of sulfoaluminate clinker, and other materials are the same as in Example 1.

[0087] Test results:

[0088] The delayed formation of ettringite leads to insufficient early hydration products, which weakens the strength development of concrete and causes the concrete strength to decrease. The reduction of ettringite leads to reduced concrete density and increased sulfate penetration paths, thus reducing the impermeability.

[0089] The compressive strength of the earthquake-resistant square pile prepared by the present invention is ≥2800kN, the residual deformation is ≤2‰ when the interlayer displacement angle reaches 1 / 50 under the action of 0.4g earthquake acceleration, and the sulfate corrosion resistance grade is ≥KS120.

[0090] Table 1 Performance comparison of the square piles obtained in the embodiment, comparative example and control group

[0091]

[0092] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A seismic-resistant square pile for a chemical powder production device, characterized in that: include: The invention relates to a square-section pile body, an internal prestressed steel cage and a fiber concrete outer layer sequentially arranged on the outer side of the square-section pile body, wherein the pile top and pile bottom are respectively provided with a mortise and tenon joint portion and a mortise and tenon joint groove for use in conjunction with each other, so as to connect the pile top and pile bottom; wherein the fiber concrete outer layer is prepared from the following raw materials in parts by weight: 125-135 parts of crushed stone, 350-480 parts of medium-coarse sand, 210-250 parts of Portland cement, 50-70 parts of sulfoaluminate cement, 0.5-1.0 part of nano-silicon dioxide, 18-35 parts of silica fume, 20-38 parts of anhydrite, 98-102 parts of polycarboxylic acid high-efficiency water-reducing agent, 0.3-0.8 part of organosilicon water-repellent, 70-80 parts of polypropylene alcohol fiber, 20-30 parts of polybutene fiber, 16-26 parts of industrial aluminum sulfate, 1-5 parts of sodium lauryl sulfate, and 14-25 parts of sulfoaluminate clinker.

2. The earthquake-resistant square pile for chemical powder production equipment according to claim 1, characterized in that: The crushed stone particle size is 5-25mm with continuous grading, the content of needle-shaped particles in the crushed stone is ≤5%, the sand content is ≤1.5%, and the mud content is ≤0.5%; and / or medium coarse sand with a fineness modulus of 2.6-3.0, Portland cement with PO 42.5R, nanosilica D 50 =10-20nm, silica fume specific surface area ≥20000m 2 / kg, the solid content of polycarboxylate superplasticizer is 20%; The length of the polypropylene alcohol fiber is 12-15 mm and the diameter is 30-50 μm; the diameter of the polybutene fiber is 18-22 μm and the length is 12-30 mm.

3. The earthquake-resistant square pile for chemical powder production equipment according to claim 1, characterized in that: The mass ratio of Portland cement to sulphoaluminate cement is (3.5-4.5):1, and the mass ratio of nano-silica to silica fume is 1:(21-29); and / or the volume ratio of polypropylene alcohol fiber to polybutylene fiber is (3.5-4):1, and the total amount of the two fibers is controlled to be 0.5-1.2 vol.% of the total volume of the raw materials; And / or the mass ratio of industrial aluminum sulfate to sulfoaluminate clinker is (1-1.5):

1.

4. The earthquake-resistant square pile for chemical powder production equipment according to claim 1, characterized in that: The outer length of square section piles ranges from 200mm to 1800mm, and the wall thickness is 1 / 8 to 1 / 6 of the side length.

5. The earthquake-resistant square pile for chemical powder production equipment according to claim 1, characterized in that: The prestressed steel cage is formed by a number of longitudinal steel bars and a number of annular stirrups. The longitudinal steel bars are HRB500E and above, and the prestressing force is 300-500kN.

6. The earthquake-resistant square pile for chemical powder production equipment according to claim 1, characterized in that: The mortise and tenon joint includes a connecting block and a bolt. The connecting block is fixed to the top of the pile by the bolt. The shape of the connecting block matches the shape of the mortise and tenon joint groove. Preferably, the mortise and tenon joint also includes an embedded steel plate with a thickness of 8-12 mm, which is welded and fixed to the prestressed steel cage and has a surface treated by sandblasting.

7. The earthquake-resistant square pile for chemical powder production equipment according to claim 6, characterized in that: There are three connecting blocks, namely two I-shaped connecting blocks and one L-shaped connecting block. The L-shaped connecting block is located at the angle of the pile top, and the two I-shaped connecting blocks are located on both sides of the L-shaped connecting block. One end or both ends of the connecting block is provided with an inclined surface, and the inclination angle of the inclined surface is 5°-8°.

8. The earthquake-resistant square pile for chemical powder production equipment according to claim 1, characterized in that: Stiffening rings are arranged at intervals along the axial direction of the prestressed steel cage. The thickness of the stiffening rings is 50-80mm and the spacing is 200-600mm.

9. The earthquake-resistant square pile for chemical powder production equipment according to claim 1, characterized in that: An elastic shock-absorbing layer is added to the mortise and tenon joint at the pile end. The elastic shock-absorbing layer is made of polyurethane or rubber material with a thickness of 20-30mm and a compression strength of ≥20MPa.

10. The earthquake-resistant square pile for chemical powder production equipment according to claim 1, characterized in that: The fiber concrete outer layer mix ratio meets the requirements of water-binder ratio ≤ 0.28, chloride ion content ≤ 0.06%, and alkali content ≤ 3.0 kg / m 3 , sulfate resistance grade ≥KS120.

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