Two-way prestressed prestressing equipment and production methods using the equipment

Abstract

This application relates to a complete set of equipment for bidirectional prestressed concrete and a production method using the complete set of equipment, belonging to the field of prestressed pipe pile preparation technology. The bidirectional prestressed concrete equipment includes a hollow mold, a tensioning mechanism, and a centrifugal mechanism. A reinforcing cage and a tensioning plate are inserted into the mold. The tensioning plate is detachably connected to the end wall of the reinforcing cage. The tensioning mechanism drives the tensioning plate to move along the axis of the reinforcing cage, and the centrifugal mechanism drives the mold to rotate around the central axis of the reinforcing cage. It also includes a clamping element. A variable sealing gasket is inserted in the gap between the tensioning plate and the mold. The sealing gasket is arranged circumferentially along the tensioning plate, and the clamping element controls the deformation of the sealing gasket so that the sealing gasket simultaneously presses against the inner wall of the mold and the peripheral wall of the tensioning plate. This application optimizes the sealing effect of the sealing gasket on the gap between the tensioning plate and the mold, reducing the leakage of concrete from the gap.

Description

Technical Field

[0001] This application relates to the field of prestressed pipe pile preparation technology, and in particular to a complete set of bidirectional prestressed prestressing equipment and a production method using the complete set of equipment. Background Technology

[0002] Pre-tensioning generally refers to pre-stressed concrete. Prestressed concrete is a method of improving the crack resistance of reinforced concrete members and preventing premature cracking by applying stress to them during the prefabrication process. The method of tensioning the reinforcing steel bars before pouring concrete is called pre-tensioning. Prestressed concrete pipe piles prepared using pre-tensioning are widely used in industrial and civil buildings, ports, railways, and other fields.

[0003] The manufacturing process of prestressed concrete pipe piles generally includes the following steps: S1, cleaning the upper and lower mold halves; S2, inserting the reinforcing cage into the lower mold halves, installing a tensioning plate inside the lower mold halves, fixing the tensioning plate to the end wall of the reinforcing cage, and fixing a bolt to the end of the tensioning plate away from the reinforcing cage, ensuring the bolt passes through the end of the lower mold halves and extends to the outside; S3, injecting concrete into the lower mold halves to fill them and cover the outer surface of the reinforcing cage; S4, closing the mold halves to secure the reinforcing cage and concrete within the cylindrical cavity formed by the upper and lower mold halves; S5, tensioning, specifically using external tensioning equipment to tension the bolt, causing the bolt to pull the tensioning plate away from the reinforcing cage, thus stretching the reinforcing cage; S6, rotating the mold at high speed to allow the concrete inside to adhere to the inner wall of the mold under high-speed centrifugal force, forming a hollow column. After allowing the concrete to harden, the preparation of the concrete pipe pile is complete.

[0004] As can be seen from the above-mentioned technologies, during high-speed centrifugation, cement slurry is prone to overflow from the gap between the tensioning plate and the mold. This not only wastes concrete, but also results in the concrete at the end of the final pipe pile being not dense, thus affecting product quality. Summary of the Invention

[0005] In order to improve the sealing between the tensioning plate and the inner wall of the mold and reduce the overflow of concrete from the gap between the tensioning plate and the inner wall of the mold, this application provides a complete set of bidirectional prestressed concrete equipment and a production method using the complete set of equipment.

[0006] Firstly, this application provides a complete set of bidirectional prestressed prestressing equipment, which adopts the following technical solution:

[0007] A complete set of bidirectional prestressed concrete apparatus includes a hollow mold, a tensioning mechanism, and a centrifugal mechanism. A reinforcing cage and a tensioning plate are inserted into the mold. The tensioning plate is detachably connected to the end wall of the reinforcing cage. The tensioning mechanism drives the tensioning plate to move along the axis of the reinforcing cage. The centrifugal mechanism drives the mold to rotate around the central axis of the reinforcing cage. The apparatus also includes a clamping component. A variable sealing gasket is inserted in the gap between the tensioning plate and the mold. The sealing gasket is arranged circumferentially along the tensioning plate. The clamping component controls the deformation of the sealing gasket so that it simultaneously presses against the inner wall of the mold and the peripheral wall of the tensioning plate.

[0008] By adopting the above technical solution, adding a sealing gasket at the gap between the tensioning plate and the mold can improve the sealing performance of the gap. At the same time, the deformation of the sealing gasket is controlled by the clamping component to ensure that the sealing gasket can simultaneously abut against the inner wall of the mold and the inner wall of the tensioning plate, thereby optimizing the sealing effect of the sealing gasket on the gap between the tensioning plate and the mold and reducing the leakage of concrete from the gap.

[0009] Preferably, the tensioning plate includes a baffle and a traction plate disposed on one side of the baffle. The side wall of the baffle away from the traction plate is detachably connected to the end wall of the reinforcing cage. The sealing gasket is located in the gap between the peripheral wall of the traction plate and the inner wall of the mold. A roller is rotatably connected to the peripheral wall of the baffle along its circumference. The side wall of the roller away from the baffle is attached to the inner wall of the mold, and the rotation direction of the roller satisfies the following condition: the roller can rotate when the baffle slides relative to the axis of the mold.

[0010] By adopting the above technical solution, the setting of the roller can reduce the sliding resistance of the mold to the tensioning plate when the tensioning plate slides relative to the mold axis, while ensuring the sealing of the gap between the tensioning plate and the mold.

[0011] Preferably, the roller is provided with a magnetic sheet on its peripheral wall, and the inner wall of the mold near the roller is provided with an adsorption iron sheet that is magnetically attracted to the magnetic sheet.

[0012] By adopting the above technical solution, the setting of the magnetic sheet and the adsorption iron sheet can enhance the tightness of the fit between the roller and the inner wall of the mold without hindering the rotation of the roller, and reduce the possibility of concrete overflowing from the gap between the roller and the inner wall of the mold to the sealing gasket.

[0013] Preferably, the sealing gasket has a cavity circumferentially inside, and the sealing member includes an air inlet pipe and an air outlet pipe connected to the cavity, an air pump connected to the air inlet pipe, and an air valve disposed on the air outlet pipe; the air valve is used to control the opening and closing of the air outlet pipe, and one end of the air outlet pipe away from the cavity is connected to the air outlet end of the air pump.

[0014] By adopting the above technical solution, the air outlet pipe is first closed by the air valve, and a portion of the gas is drawn out by the air pump and introduced into the cavity of the sealing gasket, so that the sealing gasket expands. The expanded sealing gasket will press against the inner wall of the mold and the peripheral wall of the tensioning plate, thereby filling the gap between the mold and the tensioning plate and improving the sealing performance of the gap between the tensioning plate and the mold. Correspondingly, the air valve can be opened to release some of the air in the cavity, so that the sealing gasket returns to its initial shape.

[0015] Preferably, a limiting plate is provided on the side wall of the pulling plate away from the baffle along its circumference, and the limiting plate is attached to the side wall of the sealing gasket.

[0016] By adopting the above technical solution, since the limiting plate is set on the side of the sealing gasket away from the roller and the limiting plate is attached to the side wall of the sealing gasket, when the sealing gasket bulges, the sealing gasket will bulge in a concentrated direction closer to the roller under the limiting and blocking action of the limiting plate, so as to control and guide the bulging direction of the sealing gasket and ensure the force and effect of the sealing gasket on the push rod when it bulges.

[0017] Preferably, the mold is further provided with a first linkage component, which is used to drive the roller to rotate when the sealing gasket bulges.

[0018] By adopting the above technical solution, before the first linkage component is set, the roller will only rotate when there is a relative sliding between the baffle and the mold along the mold axis. After the first linkage component is set, the roller can rotate while the sealing gasket expands. Therefore, even during the centrifugal rotation of the mold, as long as the sealing gasket is controlled to expand by the clamping component, the first linkage component can drive the roller to rotate, thereby improving the activity of the concrete at the mold end, reducing the amount of concrete adhering to the roller's periphery, and reducing concrete overflow.

[0019] Preferably, the first linkage includes a push rod and a limiting clamp. One end of the push rod is connected to the side wall of the sealing gasket, and the other end passes through the limiting clamp and faces the roller. The push rod is located on one side of the center of rotation of the roller, and the limiting clamp is connected to the baffle and / or the tension plate.

[0020] By adopting the above technical solution, when the sealing gasket bulges, the push rod will move away from the sealing gasket under the influence of the bulging gasket. The limiting clamp restricts the direction of movement of the push rod, allowing it to move towards or away from the roller. When the push rod approaches the roller, it is not located at the center of rotation of the roller, but rather offset from it, situated to one side of the center. Therefore, when the end of the push rod pushes against the roller, it can cause the roller to rotate. Correspondingly, when the sealing gasket returns to its initial shape, the push rod will move away from the roller under the pull of the sealing gasket.

[0021] Secondly, this application discloses a method for producing a complete set of bidirectional prestressed prestressing equipment, comprising the following steps:

[0022] Cleaning the mold and loading the cage: Clean the inner wall of the mold and load the steel cage into the mold;

[0023] Grouting and mold closing: Inject concrete grout into the mold until the concrete fills the mold, then close the mold.

[0024] Tensioning and centrifugation: Tension the steel bars of the steel cage along the axis of the mold until the corresponding tension stress requirement is reached, then drive the mold to rotate centrifugation along its central axis height so that the concrete slurry adheres to the mold wall and forms a hollow structure.

[0025] Let stand and then demold.

[0026] In summary, this application includes the following beneficial technical effects:

[0027] Adding a sealing gasket at the gap between the tensioning plate and the mold can improve the sealing performance of the gap. At the same time, the deformation of the sealing gasket is controlled by the clamping component to ensure that the sealing gasket can simultaneously abut against the inner wall of the mold and the inner wall of the tensioning plate. This optimizes the sealing effect of the sealing gasket at the gap between the tensioning plate and the mold and reduces the leakage of concrete from the gap. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a bidirectional prestressed prestressing assembly disclosed in Embodiment 1 of this application.

[0029] Figure 2 This is an exploded view used to illustrate the internal structure of the mold in Embodiment 1 of this application.

[0030] Figure 3 yes Figure 2 An enlarged schematic diagram of the structure at point A in the middle.

[0031] Figure 4 This is a cross-sectional view in Embodiment 1 of this application used to illustrate the connection relationship between the tensioning plate and the mold.

[0032] Explanation of reference numerals in the attached drawings: 1. Mold; 11. Lower mold; 12. Upper mold; 13. Adsorption iron sheet; 14. First linkage component; 141. Push rod; 142. Limiting clamp; 2. Tensioning mechanism; 21. Screw; 22. Sleeve; 23. Rotating rod; 24. Drive motor; 25. Telescopic component; 3. Centrifugal mechanism; 31. Rotating roller; 32. Centrifugal motor; 4. Tensioning plate; 41. Pulling plate; 411. Sealing gasket; 4111. Cavity; 412. Clamping component; 4121. Air inlet pipe; 4122. Air outlet pipe; 4123. Air pump; 4124. Air valve; 42. Baffle; 421. Roller; 422. Magnet piece; 44. Limiting plate; 5. Reinforcing cage; 6. Fixing plate. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0034] Example 1

[0035] Embodiment 1 of this application discloses a complete set of bidirectional prestressed prestressing equipment, referring to... Figure 1 and Figure 2 The system includes a hollow mold 1, a tensioning mechanism 2, and a centrifugal mechanism 3. The mold 1 is cylindrical and consists of an upper mold 12 and a lower mold 11. Bolts can be installed on the sidewalls of the upper mold 12 and lower mold 11 near each other, allowing the upper mold 12 to be fixedly fitted onto the upper surface of the lower mold 11. A reinforcing cage 5, a tensioning plate 4, and a fixing plate 6 are inserted inside the mold 1. The fixing plate 6 is detachably connected to one end of the reinforcing cage 5, and the tensioning plate 4 is detachably connected to the other end of the reinforcing cage 5. The fixing plate 6 is bolted to one end of the mold 1 and fits against the inner end wall of the mold 1. The tensioning plate 4 is bolted to the other end of the mold 1, and a space is reserved between the tensioning plate 4 and the inner end wall of the mold 1. The tensioning mechanism 2 is located outside the mold 1 and is used to drive the tensioning plate 4 to move away from the reinforcing cage 5, thereby stretching the reinforcing bars in the reinforcing cage 5. The centrifugal mechanism 3 is located outside the mold 1 and is used to drive the mold 1 to rotate at high speed around its central axis.

[0036] Reference Figure 1 and Figure 2 The centrifugal mechanism 3 includes symmetrically arranged rotating rollers 31 and a centrifugal motor 32 connected to the end of the rotating rollers 31. The distance between the two rotating rollers 31 is smaller than the diameter of the mold 1. When the mold 1 is placed above the two rotating rollers 31, the mold 1 is supported by the rotating rollers 31. The centrifugal motor 32 is started to drive the rotating rollers 31 to rotate at high speed, so that the mold 1 rotates under the friction of the rotating rollers 31, thereby realizing the centrifugal action on the concrete inside the mold 1.

[0037] Reference Figure 2 and Figure 3The tensioning plate 4 includes a tensioning plate 41 and a baffle 42. The baffle 42 is located on the side of the tensioning plate 41 near the reinforcing cage 5 and is detachably connected to the end wall of the reinforcing cage 5. The other side of the baffle 42 is fixedly welded to the side wall of the tensioning plate 41. The side of the tensioning plate 41 facing away from the baffle 42 is connected to the tensioning mechanism 2. The tensioning mechanism 2 includes a screw 21, a sleeve 22, a rotating rod 23, a drive motor 24, and a telescopic component 25. The screw 21 is fixed to the side wall of the tension plate 41, and the length direction of the screw 21 is parallel to the axis of the reinforcing cage 5. The screw 21 is threaded into the sleeve 22. One end of the sleeve 22 away from the screw 21 is welded to the rotating rod 23. The rotating rod 23 passes through the end of the mold 1 and is connected to the driving end of the drive motor 24. One end of the telescopic component 25 is detachably connected to the inner end of the mold 1, and the other end is detachably connected to the side wall of the tension plate 41. The telescopic component 25 is parallel to the length direction of the screw 21. Specifically, the telescopic component 25 can be a telescopic tube with a spring.

[0038] Reference Figure 2 and Figure 3 By connecting the drive end of the drive motor 24 to the end of the rotating rod 23 and starting the drive motor 24, the drive motor 24 drives the rotating rod 23 and the sleeve 22 to rotate. During the rotation of the sleeve 22, since the sleeve 22 is threadedly connected to the screw 21, the screw 21 will move relative to the sleeve 22. The direction of movement is parallel to the axis of the steel cage 5, which in turn causes the pulling plate 41 and the baffle 42 to move together, thereby achieving the pulling of the steel cage 5 in the axial direction.

[0039] Reference Figure 3 and Figure 4 A plurality of rollers 421 are rotatably connected to the periphery of the baffle 42. The rotation direction of the rollers 421 satisfies the following condition: the rollers 421 can rotate when the baffle 42 moves relative to the axis of the reinforcing cage 5. The side of the rollers 421 away from the baffle 42 abuts against the inner wall of the mold 1, and the surface of the rollers 421 is covered with a magnetic sheet 422. An adsorption iron sheet 13 is embedded in the inner wall of the mold 1 for magnetic attraction with the magnetic sheet 422.

[0040] Reference Figure 3 and Figure 4 A sealing gasket 411 is inserted in the gap between the tension plate 41 and the mold 1. The sealing gasket 411 can be made of rubber. The sealing gasket 411 is fixedly bonded to the periphery of the tension plate 41, and the other side of the sealing gasket 411 is attached to the inner wall of the mold 1. A limiting plate 44 is integrally formed along the periphery of the side wall of the tension plate 41 away from the baffle 42. The limiting plate 44 is attached to the side wall of the sealing gasket 411.

[0041] Reference Figure 3 and Figure 4The sealing gasket 411 has a cavity 4111 circumferentially formed inside it, and the tension plate 41 is provided with a clamping member 412 for driving the sealing gasket 411 to expand and deform. The clamping member 412 specifically includes an air inlet pipe 4121 and an air outlet pipe 4122 connected to the cavity 4111, an air pump 4123 connected to the air inlet pipe 4121, and an air valve 4124 provided on the air outlet pipe 4122. The air valve 4124 is used to control the opening and closing of the air outlet pipe 4122. The end of the air inlet pipe 4121 away from the cavity is connected to the air outlet end of the air pump 4123. In actual operation, the air valve 4124 is used to make the air outlet pipe 4122 not connected to the cavity 4111. Then, the air pump 4123 is started to inflate the cavity 4111, causing the sealing gasket 411 to bulge and press against the inner wall of the mold 1. Then, the air valve 4124 is opened to release some of the air in the cavity 4111, restoring the sealing gasket 411 to its initial shape. An external controller can be connected to automatically control the alternating opening and closing of the air valve 4124 and the air pump 4123, that is, to repeat the above operation, thereby strengthening the sealing between the tension plate 41 and the mold 1 through the intermittent bulging of the sealing gasket 411.

[0042] Reference Figure 3 and Figure 4 The mold 1 is also provided with a first linkage component 14. There can be multiple first linkage components 14. Each first linkage component 14 includes a push rod 141 and a limiting hoop 142. The limiting hoop 142 is welded to the baffle 42 and / or the tension plate 41. In this embodiment, the limiting hoop 142 is welded to the side wall of the tension plate 41. The length direction of the push rod 141 is parallel to the length direction of the reinforcing cage 5. One end of the push rod 141 is fixedly bonded to the side wall of the sealing gasket 411, and the other end passes through the limiting hoop 142 and faces the side of the rotation center of the roller 421. That is, the rotation center of the roller 421 is not on the extension line of the length direction of the push rod 141.

[0043] The implementation principle of the bidirectional prestressed prestressing complete set of equipment disclosed in Embodiment 1 of this application is as follows: The reinforcing cage 5 is inserted into the lower mold 11 along the insertion direction of the lower mold 11. One end of the reinforcing cage 5 is connected to the fixing plate 6, and the other end is installed with the tensioning plate 4. The fixing plate 6 is fixedly installed on the inner end wall of the lower mold 11, and the tensioning plate 4 is connected to the tensioning structure. Then, concrete slurry is injected into the lower mold 11 so that the concrete slurry covers the entire reinforcing cage 5. Then, the upper mold 12 is fixedly covered on the upper mold 12. Then, the tensioning mechanism 2 drives the tensioning plate 4 to move away from the reinforcing cage 5, thereby achieving the effect of stretching the reinforcing cage 5. Then, the tensioning mechanism 2 is removed from the tensioning plate 4, and the centrifugal mechanism 3 drives the mold 1 to rotate at high speed, so that the concrete in the mold 1 adheres to the inner wall of the mold 1 to form a hollow column shape. Finally, the concrete is allowed to solidify and be demolded by leaving the mold 1 still for a specified time.

[0044] Embodiment 1 of this application also discloses a production method for a complete set of bidirectional prestressed prestressing equipment, including the following steps:

[0045] S1. Cleaning the mold and loading the cage: Clean the inner wall of mold 1 and load the steel cage 5 into mold 1.

[0046] The cleaning of the inner wall of mold 1 mainly involves scraping off concrete residue from the inner wall of mold 1 and spraying a release agent onto the inner wall of mold 1 so that the concrete tube obtained after final curing can be smoothly removed from mold 1.

[0047] S2. Grouting and mold closing: Inject concrete grout into mold 1 until the concrete fills mold 1 and then close the mold.

[0048] S3. Tensioning and centrifugation: Tension the steel bars of the steel cage 5 along the axis of mold 1 until the corresponding tension stress requirement is reached. Then drive mold 1 to rotate centrifugation along its central axis so that the concrete slurry adheres to the perimeter of mold 1 to form a hollow structure.

[0049] S4. Let stand, then demold.

[0050] After the centrifugal rotation of mold 1 is completed, the concrete can be left to solidify and form by static placement. In order to accelerate the solidification and forming of the concrete, steam curing can be carried out on mold 1 during the static placement stage to promote the forming of the concrete by heating with hot steam.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A complete set of bidirectional prestressed concrete apparatus, comprising a hollow mold (1), a tensioning mechanism (2), and a centrifugal mechanism (3), wherein a reinforcing cage (5) and a tensioning plate (4) are inserted into the mold (1), the tensioning plate (4) is detachably connected to the end wall of the reinforcing cage (5), the tensioning mechanism (2) is used to drive the tensioning plate (4) to move along the axial direction of the reinforcing cage (5), and the centrifugal mechanism (3) is used to drive the mold (1) to rotate about the central axis of the reinforcing cage (5); characterized in that: It also includes a clamping member (412), and a variable sealing gasket (411) is inserted in the gap between the tensioning plate (4) and the mold (1). The sealing gasket (411) is arranged along the circumference of the tensioning plate (4). The clamping member (412) is used to control the deformation of the sealing gasket (411) so that the sealing gasket (411) simultaneously presses against the inner wall of the mold (1) and the circumferential wall of the tensioning plate (4). The sealing gasket (411) has a cavity (4111) circumferentially inside. The abutting member (412) includes an air inlet pipe (4121) and an air outlet pipe (4122) connected to the cavity (4111), an air pump (4123) connected to the air inlet pipe (4121), and an air valve (4124) provided on the air outlet pipe (4122). The air valve (4124) is used to control the opening and closing of the air outlet pipe (4122). One end of the air outlet pipe (4122) away from the cavity (4111) is connected to the air outlet end of the air pump (4123).

2. The bidirectional prestressed prestressing assembly according to claim 1, characterized in that: The tensioning plate (4) includes a baffle (42) and a tensioning plate (41) disposed on one side of the baffle (42). The side wall of the baffle (42) away from the tensioning plate (41) is detachably connected to the end wall of the steel cage (5). The sealing gasket (411) is located in the gap between the peripheral wall of the tensioning plate (41) and the inner wall of the mold (1). The peripheral wall of the baffle (42) is rotatably connected to a roller (421) along its circumference. The side wall of the roller (421) away from the baffle (42) is attached to the inner wall of the mold (1). The rotation direction of the roller (421) satisfies the following condition: the roller (421) can rotate when the baffle (42) slides relative to the axis of the mold (1).

3. The bidirectional prestressed prestressing assembly according to claim 2, characterized in that: The roller (421) is provided with a magnet (422) on its peripheral wall, and the mold (1) is provided with an adsorption iron sheet (13) that is magnetically attracted to the magnet (422) on its inner wall near the roller (421).

4. The complete set of bidirectional prestressed prestressing equipment according to claim 2, characterized in that: A limiting plate (44) is provided on the side wall of the pull plate (41) away from the baffle (42) along its circumference, and the limiting plate (44) is attached to the side wall of the sealing gasket (411).

5. The bidirectional prestressed prestressing assembly according to claim 2, characterized in that: The mold (1) is also provided with a first linkage component (14), which is used to drive the roller (421) to rotate when the sealing gasket (411) bulges.

6. The bidirectional prestressed prestressing assembly according to claim 5, characterized in that: The first linkage (14) includes a push rod (141) and a limiting clamp (142). One end of the push rod (141) is connected to the side wall of the sealing gasket (411), and the other end passes through the limiting clamp (142) and faces the roller (421). The push rod (141) is located on one side of the rotation center of the roller (421). The limiting clamp (142) is connected to the baffle (42) and / or the pull plate (41).

7. The production method of the bidirectional prestressed prestressing complete set of equipment according to claim 1, characterized in that: Includes the following steps: Cleaning the mold and loading the cage: Clean the inner wall of the mold (1) and load the steel cage (5) into the mold (1); Grouting and mold closing: Inject concrete grout into the mold (1) until the concrete fills the mold (1) and then close the mold; Tensioning and centrifugation: Tension the steel bars of the steel cage (5) along the axis of the mold (1) until the corresponding tension stress requirement is reached. Then drive the mold (1) to rotate centrifugation along its central axis so that the concrete slurry adheres to the periphery of the mold (1) to form a hollow structure. Let stand and then demold.

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