Modified phosphogypsum pipe pile preparation device and use method

Abstract

The application relates to a modified phosphogypsum pipe pile preparation device and a use method, relates to the technical field of prefabricated pipe piles, and aims to solve the problems that the hardened body formed by modified phosphogypsum homogeneous mixed material has high porosity, a loose structure and low structural strength of the pipe pile, the device comprises a tubular outer mold and an inner mold fixed in the inner cavity of the outer mold, the inner mold is coaxially arranged with the outer mold, a pouring area is arranged between the inner mold and the outer mold, a steel reinforcement cage is arranged in the pouring area, extrusion plates are arranged on both ends of the inner mold, and driving pieces for driving the extrusion plates to move in the length direction of the inner mold are arranged on the inner mold. The application has the effect of improving the compactness of the modified phosphogypsum homogeneous mixed material in the pipe pile.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of prefabricated pipe piles, in particular to a modified phosphogypsum pipe pile preparation device and a use method. BACKGROUND

[0002] By adopting lime to neutralize and pretreat phosphogypsum, the activation index of the lime and phosphogypsum mixture and the change rule of the basic mechanical properties of the cement mortar with the lime content are studied, and mechanism analysis is conducted in combination with infrared spectroscopy and electron microscope scanning.

[0003] The results show that the activation index of the phosphogypsum is closely related to the lime content, the best phosphogypsum content for the activation index of the modified phosphogypsum is 2%, the maximum consistency water content of the mortar and the setting time of the cement hydration reaction of the phosphogypsum cement-based material are greatly increased by adding lime into the phosphogypsum, the physical and mechanical properties of the phosphogypsum cement mortar are greatly affected by the lime content, and the corresponding phosphogypsum content for the better mechanical properties of the mortar is also 2%. The experiment proves that the phosphogypsum cement mortar treated by lime can prepare the cement mortar with better performance, and the utilization rate of the phosphogypsum in the building materials is improved.

[0004] Due to the high viscosity of the phosphogypsum slurry, the ordinary stirring tank is difficult to fully stir the phosphogypsum slurry, and after the stirring is completed, a part of the phosphogypsum slurry will be attached to the inner wall of the stirring tank, the hardened body formed by the phosphogypsum slurry has high porosity and loose structure, and the pipe pile prepared has low structural strength. SUMMARY

[0005] In order to improve the compactness of the modified phosphogypsum homogeneous mixed material in the pipe pile, the application provides a modified phosphogypsum pipe pile preparation device and a use method.

[0006] In the first aspect, the application provides a modified phosphogypsum pipe pile preparation device, which adopts the following technical scheme:

[0007] A modified phosphogypsum pipe pile preparation device, comprising a tubular outer mold and an inner mold fixed in the inner cavity of the outer mold, the inner mold and the outer mold are coaxially arranged, the inner mold and the outer mold are arranged as a pouring area, a steel reinforcement cage is arranged in the pouring area, the two ends of the inner mold are sleeved with extrusion plates, and the inner mold is provided with a driving member for driving the extrusion plates to move in the length direction of the inner mold.

[0008] By adopting the above technical scheme, the steel reinforcement cage is placed in the pouring area, and the modified phosphogypsum homogeneous mixed material is poured in the pouring area, the driving member drives the extrusion plates to extrude the modified phosphogypsum homogeneous mixed material in the pouring area, the compactness of the modified phosphogypsum homogeneous mixed material is improved by pressure control, and the structural strength of the pipe pile is enhanced.

[0009] Preferably, the inner mold is provided with a clamping block slidingly arranged thereon, and an outer wall of the clamping block is in abutment with an inner wall of the outer mold.

[0010] By adopting the above technical solution, the clamping block is slidingly arranged on the inner mold, and the outer peripheral wall of the clamping block is in abutment with the inner wall of the outer mold. The clamping block supports and fixes the inner mold, thereby ensuring that the inner mold and the outer mold are coaxially arranged, and further improving the accuracy of the size of the pipe pile.

[0011] Preferably, a plurality of accommodating holes for accommodating the steel bars are formed in the clamping block.

[0012] By adopting the above technical solution, the steel bars on the steel cage are inserted into the corresponding accommodating holes, and the side wall of the accommodating hole supports the steel cage, thereby reducing the contact between the steel cage and the inner wall of the outer mold under the action of gravity, and ensuring that the thickness of the protective layer of the steel bars can reach the standard, and reducing the situation that the steel bars are exposed on the pipe pile to cause corrosion of the steel bars. The accommodating hole also facilitates the movement of the steel bars in the accommodating hole when the clamping block extrudes the modified phosphogypsum homogeneous mixture of the pouring area, thereby facilitating the collision between the clamping block and the steel bars when the clamping block extrudes the pouring area. In addition, when the overall strength of the pipe pile reaches 90% of the set strength, prestress tensioning is performed to ensure that the physical and mechanical properties of the modified phosphogypsum pipe pile in the use process are optimized.

[0013] Preferably, the material of the clamping block is consistent with that of the pipe pile, and the minimum distance between the steel bars and the outer wall of the side of the clamping block close to the extrusion plate is greater than the thickness of the protective layer of the steel bars.

[0014] By adopting the above technical solution, the clamping block is located at both ends of the pipe pile, and the steel bars are located in the accommodating holes. When the modified phosphogypsum homogeneous mixture is extruded by the clamping block, the modified phosphogypsum homogeneous mixture will enter the accommodating holes, thereby fixing the steel bars and the clamping block. In addition, the minimum distance between the steel bars and the outer wall of the side of the clamping block close to the extrusion plate is greater than the thickness of the protective layer of the steel bars, thereby enhancing the protection of the steel bars by the modified phosphogypsum homogeneous mixture.

[0015] Preferably, a plurality of clamping grooves and limiting grooves perpendicular to and communicating with the clamping grooves are formed in the clamping block.

[0016] By adopting the above technical solution, when the clamping block extrudes the modified phosphogypsum homogeneous mixture, the modified phosphogypsum homogeneous mixture will enter the clamping grooves and the limiting grooves and be solidified into blocks by strong pressure. The size of the blocks in the limiting grooves is greater than that of the clamping grooves, thereby making the solidified and formed phosphogypsum blocks in the limiting grooves not easy to be separated from the clamping grooves, and further enhancing the connection strength between the clamping block and the pipe pile.

[0017] Preferably, the outer mold comprises a first outer mold and a second outer mold which are detachably connected, and the first outer mold and the second outer mold are symmetrically arranged.

[0018] By adopting the technical scheme, the first outer mold is detached from the second outer mold to facilitate the placement of the reinforcement cage into the first outer mold and the pouring of the modified phosphogypsum homogeneous mixture onto the inner wall of the first outer mold.

[0019] Preferably, the second outer mold comprises a third outer mold detachably connected to the second outer mold.

[0020] By adopting the technical scheme, when the pouring height of the modified phosphogypsum homogeneous mixture is equal to the height of the first outer mold, the second outer mold is installed on the first outer mold, and the third outer mold is detached from the second outer mold, so as to facilitate the continuous pouring of the modified phosphogypsum homogeneous mixture. When the modified phosphogypsum homogeneous mixture is poured to the height of the third outer mold, the third outer mold is installed on the second outer mold. At this time, the modified phosphogypsum homogeneous mixture occupies most of the pouring area.

[0021] Preferably, the driving member is a hydraulic cylinder, the driving member is detachably connected to the inner mold, and a plurality of hydraulic telescopic rods for driving the extrusion plate to reciprocate on the inner mold are arranged on the driving member.

[0022] By adopting the technical scheme, the hydraulic cylinder drives the hydraulic telescopic rod to extend, thereby pushing the extrusion plate to slide on the inner mold. The extrusion plate pushes the clamping plate to extrude the modified phosphogypsum homogeneous mixture in the pouring area, thereby improving the compactness of the modified phosphogypsum homogeneous mixture. Since the clamping plate is made of concrete material of the modified phosphogypsum homogeneous mixture, if the hydraulic telescopic rod directly acts on the clamping plate, the clamping plate may be damaged. The extrusion plate can increase the stress surface of the clamping plate, thereby reducing the damage of the clamping plate under strong pressure, and further ensuring the quality of the pipe pile.

[0023] In a second aspect, the application provides a use method of the modified phosphogypsum pipe pile preparation device.

[0024] S1, detach the second outer mold from the first outer mold, place the reinforcement cage in the first outer mold, arrange the inner mold in the reinforcement cage, and arrange the two clamping blocks at the two ends of the inner mold. The outer circle of the clamping block abuts against the inner wall of the outer mold, and the steel bars are inserted into the corresponding accommodating holes. The clamping block supports and positions the inner mold and the reinforcement cage.

[0025] S2, pour the modified phosphogypsum homogeneous mixture into the pouring area until the modified phosphogypsum homogeneous mixture is equal to the height of the first outer mold. Then, install the second outer mold on the first outer mold, detach the third outer mold from the second outer mold, and continue to pour the modified phosphogypsum homogeneous mixture until the modified phosphogypsum homogeneous mixture is equal to the height of the second outer mold. Then, install the third outer mold on the second outer mold.

[0026] S3, first, the extrusion plate is sleeved on both ends of the inner mold, and then the driving member is installed on both ends of the inner mold, the hydraulic telescopic rod is extended to push the extrusion plate and the clamping block to slide on the inner mold, so as to extrude the modified phosphogypsum homogeneous mixture in the pouring area, so that the modified phosphogypsum homogeneous mixture fills the pouring area, and the clamping block is continuously pushed to extrude and compact the modified phosphogypsum homogeneous mixture in the pouring area.

[0027] S4, when the modified gypsum forming body reaches the standard strength, the second outer mold is removed and the formed pipe pile is taken out from the first outer mold, then the extrusion plate and the driving member are disassembled from the inner mold and the inner mold is separated from the pipe pile.

[0028] S5, the pipe pile is sent into the curing room, and the pipe pile is cured until the design tension standard strength is reached, and the pipe pile is subjected to prestressed tension process to form a high-strength and high-quality pipe pile, so as to ensure that the physical and mechanical properties of the modified phosphogypsum pipe pile are optimized during use.

[0029] As preferred, in the step S1, the clamping block is sleeved on the inner mold, and the opposite two surfaces of the two clamping blocks need to be roughened.

[0030] By adopting the above technical scheme, the clamping block is roughened, which can increase the bonding degree of the modified phosphogypsum forming body and the clamping block when pouring the modified phosphogypsum homogeneous mixture, and can also eliminate the joint between the pipe pile and the clamping block.

[0031] In summary, the present application has at least one of the following beneficial technical effects:

[0032] 1. The steel reinforcement cage is placed in the pouring area, and the modified phosphogypsum homogeneous mixture is poured in the pouring area, and the driving member drives the extrusion plate to extrude the phosphogypsum in the pouring area, thereby increasing the density of the modified phosphogypsum homogeneous mixture and enhancing the structural strength of the pipe pile;

[0033] 2. The steel bars on the steel reinforcement cage are inserted into the corresponding accommodating holes, and the side wall of the accommodating hole supports the steel reinforcement cage, thereby reducing the contact between the steel reinforcement cage and the inner wall of the outer mold under the action of gravity, thereby ensuring that the thickness of the protective layer of the steel bars can reach the standard, and reducing the occurrence of the situation that the steel bars are exposed on the pipe pile to cause corrosion of the steel bars. The accommodating hole also facilitates the movement of the steel bars in the accommodating hole when the clamping block extrudes the modified phosphogypsum homogeneous mixture in the pouring area, thereby facilitating the collision between the clamping block and the steel bars when the clamping block extrudes the pouring area;

[0034] 3. When the clamping block extrudes the modified phosphogypsum homogeneous mixture, the modified phosphogypsum homogeneous mixture will enter the clamping groove and the limiting groove and solidify into blocks, and the size of the blocks in the limiting groove is larger than that of the clamping groove, so that the phosphogypsum blocks in the limiting groove are not easy to be separated from the clamping groove, thereby further enhancing the connection strength between the clamping block and the pipe pile. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application;

[0036] Figure 2 is a schematic diagram of the structure in the pouring area of an embodiment of the present application;

[0037] Figure 3 is a schematic diagram of the cross-sectional structure of a clamping block of an embodiment of the present application.

[0038] Reference signs: 1, outer mold; 11, first outer mold; 12, second outer mold; 121, third outer mold; 13, lug plate; 2, inner mold; 3, clamping block; 31, accommodating hole; 32, clamping groove; 33, limiting groove; 4, pouring area; 41, reinforcement cage; 5, extrusion plate; 6, driving member; 61, hydraulic telescopic rod. DETAILED DESCRIPTION

[0039] The following will be described in detail in combination with the accompanying drawings Figures 1-3 The present application will be further described in detail.

[0040] The present application discloses a modified phosphogypsum pipe pile preparation device. Referring to Figure 1 and Figure 2 , including a hollow tubular inner mold 2 and an outer mold 1, the inner mold 2 is arranged in the inner cavity of the outer mold 1 and the length of the inner mold 2 is longer than that of the outer mold 1, the inner mold 2 and the outer mold 1 are coaxially arranged, and the two ends of the inner mold 2 are respectively sleeved with annular clamping blocks 3, the outer peripheral wall of the clamping block 3 abuts against the inner wall of the outer mold 1, and the clamping block 3 provides support and positioning for the inner mold 2, so that the inner mold 2 and the outer mold 1 can maintain a coaxial positional relationship.

[0041] Referring to Figure 1 , the outer mold 1 includes a first outer mold 11 and a second outer mold 12 which are detachably connected, the first outer mold 11 and the second outer mold 12 are both semi-annular tubular, the first outer mold 11 and the second outer mold 12 are both fixedly connected with lug plates 13, the same bolt is threaded through two adjacent lug plates 13, and a nut is threadedly connected to one end of the bolt, and the first outer mold 11 and the second outer mold 12 can be fixed by screwing the nut against the lug plates 13.

[0042] Referring to Figure 2The area between the outer wall of the inner mold 2 and the inner wall of the outer mold 1 is a pouring area 4, and a steel reinforcement cage 41 is arranged in the pouring area 4. The opposite side of each of the two clamping blocks 3 is provided with a plurality of accommodating holes 31. The steel bars protruding from the steel reinforcement cage 41 can be inserted into the corresponding accommodating holes 31. The inner circumferential wall of the accommodating hole 31 supports and positions the steel reinforcement cage 41. The clamping block 3 can ensure the distance between the steel bars and the inner wall of the inner mold 2 and the outer mold 1, respectively. The clamping block 3 can reduce the contact between the steel reinforcement cage 41 and the inner wall of the outer mold 1 under the action of gravity, so as to ensure that the thickness of the protective layer of the steel bars can reach the standard, and reduce the situation that the steel bars are exposed on the pipe pile to cause corrosion of the steel bars. The accommodating hole 31 also facilitates the clamping block 3 to extrude the modified phosphogypsum homogeneous mixture in the pouring area 4, and facilitates the steel bars to move in the accommodating hole, thereby avoiding the collision between the clamping block 3 and the steel bars when extruding the pouring area 4.

[0043] The second outer mold 12 is detached from the first outer mold 11, so as to facilitate the steel reinforcement cage 41 to be placed in the inner cavity of the outer mold 1. Then, the inner mold 2 is arranged in the inner circle of the steel reinforcement cage 41, and the clamping block 3 is moved and rotated, so that the steel bars can be inserted into the corresponding accommodating holes 31, thereby supporting and positioning the steel reinforcement cage 41.

[0044] Referring to Figure 1 and Figure 2 , the second outer mold 12 is detachably connected with a third outer mold 121. The third outer mold 121 is detached from the second outer mold 12, so as to facilitate the modified phosphogypsum homogeneous mixture to be poured into the pouring area 4, and the amount of the modified phosphogypsum homogeneous mixture in the pouring area 4 can meet the production requirements of a single pipe pile.

[0045] Referring to Figure 2 and Figure 3 , the material of the clamping block 3 is the same as that of the pipe pile. The minimum distance between the steel bars and the outer wall of the side of the clamping block 3 close to the extrusion plate 5 is greater than the thickness of the protective layer of the steel bars. A plurality of clamping grooves 32 and limiting grooves 33 communicating with the clamping grooves 32 are arranged on the clamping block 3. When the modified phosphogypsum homogeneous mixture is poured into the pouring area 4, the modified phosphogypsum homogeneous mixture will enter the accommodating holes 31, thereby enhancing the bonding strength between the clamping block 3 and the steel bars. At the same time, the modified phosphogypsum homogeneous mixture will enter the clamping grooves 32 and the limiting grooves 33. The modified phosphogypsum homogeneous mixture forms hardened blocks in the clamping grooves 32 and the limiting grooves 33, thereby limiting the limiting grooves 33, so that the hardened blocks are not easy to be separated from the clamping grooves 32, and the connection strength between the clamping block 3 and the pipe pile is further enhanced.

[0046] Referring to Figure 1The outer periphery wall of the extrusion plate 5 can abut against the inner wall of the outer mold 1, and further provides support force for the inner mold 2. The inner mold 2 is detachably connected with a driving member 6 for driving the extrusion plate 5 to move in the length direction of the inner mold 2. The driving member 6 is a hydraulic cylinder, and a plurality of hydraulic telescopic rods 61 are arranged on the driving member 6. One end of the hydraulic telescopic rod 61 abuts against the extrusion plate 5. The hydraulic cylinder drives the hydraulic telescopic rod 61 to extend, thereby pushing the extrusion plate 5 to slide on the inner mold 2. The extrusion plate 5 further pushes the clamping plate to extrude the modified phosphogypsum homogeneous mixture in the pouring area 4, thereby improving the compactness of the modified phosphogypsum homogeneous mixture. Since the clamping plate is made of the concrete material of the modified phosphogypsum homogeneous mixture, if the hydraulic telescopic rod 61 directly acts on the clamping plate, the clamping plate can be damaged. The extrusion plate 5 can increase the stress surface of the clamping plate, thereby reducing the damage of the clamping plate under strong pressure, and further ensuring the quality of the pipe pile.

[0047] The application further discloses a use method of the modified phosphogypsum pipe pile preparation device.

[0048] S1, preparing phosphogypsum, calcining the phosphogypsum, adding an alkaline activator to remove impurities in the phosphogypsum, and adopting a ball milling method to solve the particle size distribution and structure of the phosphogypsum to form modified phosphogypsum. The ball milling can destroy the regular plate-shaped morphology and uniform size of the dihydrate gypsum crystals in the phosphogypsum, make the particle morphology diversified into columnar, plate-shaped and granular shapes, change the normal distribution of the particles into scattered distribution, and increase the fluidity of the cementing material, thereby fundamentally improving the defects of high porosity and loose structure of the hardened body.

[0049] Finally, the glue in the modified phosphogypsum is stirred uniformly, and a retarder and a waterproof agent are added to the modified phosphogypsum, and finally the modified phosphogypsum homogeneous mixture is formed.

[0050] The second outer mold 12 is detached from the first outer mold 11, the steel reinforcement cage 41 is placed in the first outer mold 11, the inner mold 2 is arranged in the inner circle of the steel reinforcement cage 41, and the two clamping blocks 3 are arranged at the two ends of the inner mold 2. The opposite surfaces of the two clamping blocks 3 are roughened, which can increase the bonding degree of the modified phosphogypsum homogeneous mixture and the clamping blocks 3 during pouring of the modified phosphogypsum homogeneous mixture, and can eliminate the joint between the pipe pile and the clamping blocks 3. The outer circle of the clamping block 3 abuts against the inner wall of the outer mold 1, and the steel bars are inserted into the corresponding accommodating holes 31. The clamping block 3 plays a supporting and positioning role on the inner mold 2 and the steel reinforcement cage 41.

[0051] S2, pour the modified phosphogypsum homogeneous mixture into the pouring area 4 until the modified phosphogypsum homogeneous mixture is level with the first outer mold 11, then install the second outer mold 12 on the first outer mold 11, and at the same time, disassemble the third outer mold 121 from the second outer mold 12, continue to pour into the pouring area 4 until the modified phosphogypsum homogeneous mixture is level with the second outer mold 12, and install the third outer mold 121 on the second outer mold 12.

[0052] S3, first, the extrusion plate 5 is sleeved on both ends of the inner mold 2, then the driving member 6 is installed on both ends of the inner mold 2, the hydraulic telescopic rod 61 is elongated to push the extrusion plate 5 and the clamping block 3 to slide on the inner mold 2, thereby extruding the modified phosphogypsum homogeneous mixture in the pouring area 4, so that the modified phosphogypsum homogeneous mixture fills the pouring area 4, continue to apply a pushing force to the clamping block 3, extrude and compact the modified phosphogypsum homogeneous mixture in the pouring area 4, the modified phosphogypsum homogeneous mixture will enter the accommodating hole 31 under the extrusion of the clamping block 3, thereby enhancing the bonding strength of the clamping block 3 and the steel bar, and the modified phosphogypsum homogeneous mixture will enter the clamping groove 32 and the limiting groove 33 at the same time, the modified phosphogypsum homogeneous mixture forms a hardened block in the clamping groove 32 and the limiting groove 33, thereby limiting the limiting groove 33, so that the hardened block is not easy to be separated from the clamping groove 32, further enhancing the connection strength of the clamping block 3 and the pipe pile.

[0053] S4, when the modified phosphogypsum homogeneous mixture reaches the standard strength, disassemble the second outer mold 12 and take out the formed pipe pile from the first outer mold 11, then disassemble the extrusion plate 5 and the driving member 6 from the inner mold 2 and separate the inner mold 2 from the pipe pile.

[0054] S5, send the pipe pile into the curing room, cure the pipe pile until it reaches the design tensile standard strength, then perform the prestressed tensioning process on the pipe pile to form a high-strength and high-quality pipe pile, and ensure that the physical and mechanical properties of the modified phosphogypsum pipe pile are optimized during use.

[0055] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A modified phosphogypsum pipe pile preparation device, characterized in that, It includes a tubular outer mold (1) and an inner mold (2) fixed in the inner cavity of the outer mold (1). The inner mold (2) is coaxially arranged with the outer mold (1). The area between the inner mold (2) and the outer mold (1) is a casting area (4). A steel cage (41) is provided in the casting area (4). Both ends of the inner mold (2) are fitted with extrusion plates (5). The inner mold (2) is provided with a driving component (6) that drives the extrusion plates (5) to move in the length direction of the inner mold (2). A snap-fit ​​block (3) is slidably disposed on the inner mold (2), and the outer wall of the snap-fit ​​block (3) abuts against the inner wall of the outer mold (1); The material of the snap-fit ​​block (3) is the same as that of the pipe pile, and the minimum distance between the reinforcing bar and the outer wall of the snap-fit ​​block (3) near the extrusion plate (5) is greater than the thickness of the protective layer of the reinforcing bar. The snap-fit ​​block (3) is provided with a plurality of snap-fit ​​grooves (32) and a limiting groove (33) that is perpendicular to and connected to the snap-fit ​​grooves (32); The snap-fit ​​block (3) has several receiving holes (31) for accommodating reinforcing bars. The outer mold (1) includes a first outer mold (11) and a second outer mold (12) that are detachably connected, and the first outer mold (11) and the second outer mold (12) are symmetrically arranged; The second outer mold (12) includes a third outer mold (121) detachably connected to the second outer mold (12); The driving component (6) is a hydraulic cylinder. The driving component (6) is detachably connected to the inner mold (2). The driving component (6) is provided with a plurality of hydraulic telescopic rods (61) for driving the extrusion plate (5) to reciprocate on the inner mold (2).

2. A method of using a modified phosphogypsum pipe pile preparation device, comprising using the modified phosphogypsum homogeneous mixing material pipe pile preparation device as described in claim 1, characterized in that, Includes the following steps: S1. Remove the second outer mold (12) from the first outer mold (11), and put the steel cage (41) into the first outer mold (11). Insert the inner mold (2) into the steel cage (41), and put the two snap-fit ​​blocks (3) on both ends of the inner mold (2). The outer ring of the snap-fit ​​block (3) abuts against the inner wall of the outer mold (1). Insert the steel bars into the corresponding receiving holes (31). The snap-fit ​​block (3) supports and positions the inner mold (2) and the steel cage (41). S2. Pour the modified phosphogypsum homogeneous mixture into the casting area (4) until the modified phosphogypsum homogeneous mixture is at the same height as the first outer mold (11). Then install the second outer mold (12) on the first outer mold (11) and remove the third outer mold (121) from the outer mold (1). Continue to pour the modified phosphogypsum homogeneous mixture until it is at the same height as the second outer mold (12). Then install the third outer mold (121) on the second outer mold (12). S3. First, the extrusion plate (5) is fitted onto both ends of the inner mold (2), and then the drive unit (6) is installed on both ends of the inner mold (2). The hydraulic telescopic rod (61) extends and pushes the extrusion plate (5) and the snap-fit ​​block (3) to slide on the inner mold (2), thereby extruding the modified phosphogypsum homogeneous mixture in the casting area (4), so that the modified phosphogypsum homogeneous mixture fills the casting area (4). Continue to apply the thrust to the snap-fit ​​block (3) to compress the modified phosphogypsum homogeneous mixture in the casting area (4). S4. When the modified phosphogypsum molded body reaches the standard strength, the second outer mold (12) is removed and the formed pipe pile is taken out from the first outer mold (11). Then the extrusion plate (5) and the driving component (6) are removed from the inner mold (2) and the inner mold (2) is pulled out from the pipe pile. S5. The pipe piles are sent into the curing room and cured until they reach the design tension standard strength. Then, the pipe piles are subjected to prestressing tensioning to form high-strength, high-quality pipe piles, ensuring the optimal physical and mechanical properties of the modified phosphogypsum pipe piles during use.

3. The method of using the modified phosphogypsum pipe pile preparation device according to claim 2, characterized in that, In step S1, before the snap-fit ​​blocks (3) are inserted into the inner mold (2), the two opposite sides of the two snap-fit ​​blocks (3) need to be roughened.

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