A steel bar tensioning device for pre-stressed building concrete products

Abstract

The present application relates to the technical field of building concrete product forming, and particularly relates to a steel bar tensioning equipment based on pre-tensioned building concrete products, which comprises a base, a sliding frame, an end plate, a side extension plate, a side sealing element, a bottom sealing element and a fixing element; the present application solves the problem of separation of the tensioning pedestal and the side formwork in the traditional process, and through rotation of the side extension plate, the function switching of the tensioning guide support and the concrete forming formwork is completed on the same equipment, the independent process of subsequent installation and removal of the side formwork is saved, the production cycle is greatly shortened, the production line turnover rate is improved, when the side extension plate is turned to the vertical state and locked, the side sealing strip and the bottom sealing strip are automatically pressed through mechanical linkage, concrete leakage is effectively prevented, and problems such as surface defects of the component, internal non-densification and failure of the steel bar protective layer caused by concrete leakage are avoided.

Description

Technical Field

[0001] This invention relates to the field of building concrete product molding technology, and in particular to a steel bar tensioning device based on prestressed building concrete products. Background Technology

[0002] Prestressing is the application of compressive stress to a structure during construction to improve its performance, and it is commonly used in concrete structures. Prestressed roof panels are high-performance building components that integrate multiple functions such as load-bearing, enclosure, waterproofing, and insulation. They are suitable for various buildings requiring large spans, high performance, and rapid construction, with the double-T roof panel being the most widely used.

[0003] Currently, the pre-tensioning method is often used to produce double T-shaped roof panels. This involves first tensioning and temporarily anchoring the prestressing tendons, then installing ordinary steel bars and embedded parts, followed by pouring concrete into the formwork. After the concrete has cured to the specified strength, the prestressing tendons are cut off from both ends, thus giving the double T-shaped roof panel prestress.

[0004] Since the steel bars that need to be tensioned are distributed on the ribs on both sides of the double T-shaped roof panel, if the tensioning is carried out directly on the assembled template, not only is the operating space small, but there is also a lack of limiting and guiding for the tensioning equipment, which cannot guarantee the consistency of the tensioning force. In severe cases, it may lead to the failure of the prestressed system and affect the structural safety.

[0005] Therefore, currently, it is often necessary to fix the ends of the reinforcing bars using a platform, which also serves as a guide structure for the tensioning action of the tensioning equipment. The platform is generally a concrete structure, which is integrated with the ground by pouring concrete and has a strong load-bearing capacity. After tensioning using the platform, side formwork needs to be installed inside the platform. After the concrete is poured, the side formwork is removed. The installation and removal of the side formwork both take a certain amount of time, and after installation, concrete is prone to seep out from the gap between the side formwork and the base, which is called grout leakage. The cross-sectional defects and reduced strength caused by grout leakage will directly weaken the load-bearing capacity of the double T-shaped roof panel and affect the forming quality. Summary of the Invention

[0006] In view of this, the purpose of this invention is to provide a rebar tensioning device based on prestressed concrete products to solve the technical problems existing in the prior art. The device includes a base, an end plate fixedly mounted at one end of the base, and a sliding frame horizontally slidable at the other end of the base. Through holes for rebar to pass through are provided on both the left and right sides of the end plate and the sliding frame. The sliding frame is connected to a hydraulic jack via a wire rope. Side extension plates are rotatably mounted on both sides of the base. The device also includes:

[0007] A bottom seal is installed on the sliding frame; a side seal is installed between the side extension plate and the end plate, and between the side extension plate and the bottom seal; a fixing member is installed between the side extension plate, the end plate and the bottom seal to fix the position of the side extension plate.

[0008] When the side extension plate rotates to the horizontal position, it provides sliding support for the sliding frame and assists in the stable tensioning action; when the side extension plate rotates to the vertical position, it closely cooperates with the base, end plate and bottom seal under the sealing action of the side seal and bottom seal to form a concrete pouring template.

[0009] Preferably, the side seal includes a strip plate fixedly installed on the side extension plate, and the lower end of the sliding frame is provided with a guide groove that slides with the strip plate.

[0010] Preferably, the bottom seal includes a mounting plate fixedly disposed on the rear side of the sliding frame. The mounting plate has a mounting groove inside, and a bottom sealing strip is slidably disposed in the mounting groove. There is a gap between the lower end face of the mounting plate and the upper end face of the base, and the lower end face of the bottom sealing strip and the upper end face of the base are in concave-convex shape fit.

[0011] Preferably, the end plate also has an installation groove inside, and the side seal includes side sealing strips provided on both the left and right sides of the end plate and the mounting plate. The side of the side sealing strip near the installation groove is pasted on the base plate. A sliding block is fixedly provided on the side of the base plate near the installation groove. The end of the sliding block away from the base plate is located in the installation groove and a translation block is fixedly provided thereon. The side of the translation block away from the sliding block is an inclined surface and fits against the lower end face of the lifting block that slides up and down in the installation groove. A helical spring is connected between the translation block and the installation groove.

[0012] Preferably, the fixing component includes a positioning hole one and a positioning hole two. The upper surface of the end plate and the mounting plate are symmetrically provided with positioning holes one. The front and rear ends of the side extension plate are fixedly provided with fixing blocks corresponding to positioning holes one, and positioning holes two are provided on the fixing blocks.

[0013] Preferably, a round rod is fixedly installed on the upper end of the lifting block, and the upper end of the round rod slides through the mounting groove.

[0014] Preferably, the base has receiving grooves on the left and right sides, and hollow sealing strips are adhered to the left and right sides of the base. The hollow sealing strips cover the outside of the receiving grooves. A long strip is slidably installed in the receiving grooves. The side of the long strip away from the receiving groove extends into the hollow sealing strip. The side of the long strip close to the receiving groove is symmetrically fixed with pressure columns. A square hole communicating with the receiving groove is opened above the receiving groove. There are two square holes, and each square hole corresponds to a pressure column.

[0015] Preferably, a square rod is fixedly installed at the lower end of the lifting plate; the rear square rod is located directly above the rear square hole, and after tensioning is completed, the front square rod moves to directly above the front square hole.

[0016] As can be seen from the above technical solutions, the steel bar tensioning device based on prestressed concrete products designed in this invention has the following beneficial effects:

[0017] 1. This invention solves the problem of separation between tensioning platform and side formwork in traditional processes. By rotating the side extension plate, the function of tensioning guide support and concrete forming formwork can be switched on the same equipment, eliminating the need for separate subsequent installation and removal of side formwork, greatly shortening the production cycle and improving the production line turnover rate.

[0018] 2. When the side extension plate in this invention is turned into a vertical state and locked, the side sealing strip and bottom sealing strip are automatically pressed by mechanical linkage, which effectively prevents concrete leakage and avoids problems such as surface defects, internal non-compactness and failure of steel reinforcement protective layer caused by leakage, thereby ensuring the forming quality and structural durability of the prestressed roof panel.

[0019] 3. When the side extension plate in this invention is turned to a horizontal state, the strip plate on it cooperates with the guide groove on the sliding frame to provide stable sliding support and precise guidance for the tensioning process, ensuring the stability of the direction of the tensioning force, avoiding the risk of prestress loss, stress concentration or tendon breakage caused by the non-straight tensioning path, and ensuring the accuracy and effectiveness of prestress establishment.

[0020] 4. This invention combines the functions of a tensioning table and a formwork, reducing reliance on dedicated fixed concrete platforms, saving space and construction costs in the prefabrication yard, and enabling the recycling of equipment, which aligns with the trend of intensive and tool-based development in prefabrication production. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention when the side extension plate is in a horizontal state.

[0023] Figure 2 This is a three-dimensional structural diagram of the present invention after removing some of its components.

[0024] Figure 3 It is a three-dimensional structural diagram of the base, mounting plate, side extension plate, bottom sealing strip, etc.

[0025] Figure 4 yes Figure 3 An enlarged schematic diagram of the structure at point A in the middle.

[0026] Figure 5 It is a front sectional view of the base, mounting plate, side extension plate, bottom sealing strip, etc.

[0027] Figure 6 yes Figure 5Enlarged schematic diagram of the structure at point B.

[0028] Figure 7 This is a three-dimensional structural diagram of the present invention when the side extension plate is in a vertical state.

[0029] Reference numerals: 1. Base; 2. End plate; 3. Sliding frame; 4. Side extension plate; 5. Side seal; 6. Bottom seal; 7. Fixing component; 11. Receiving groove; 12. Long strip plate; 13. Hollow sealing strip; 14. Pressure column; 50. Square rod; 51. Strip plate; 52. Guide groove; 53. Side sealing strip; 54. Base plate; 55. Sliding block; 56. Translation block; 57. Lifting block; 58. Round rod; 59. Lifting plate; 61. Mounting plate; 62. Bottom sealing strip; 71. Positioning hole one; 72. Positioning hole two; 73. Fixing block. Detailed Implementation

[0030] To enable those skilled in the art to better understand the present invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] See Figure 1 and Figure 2 A rebar tensioning device based on prestressed concrete products includes a base 1, which consists of a base plate and a bottom mold fixed to the upper part of the base plate by bolts. The base plate is fixed to the ground by buried bolts. An end plate 2 is fixedly installed at one end of the base 1 by bolts, and a sliding frame 3 is horizontally slidably installed at the other end of the base 1. The sliding frame 3 has a clearance groove for avoiding the bottom mold. This invention is designed for tensioning rebar in double-T-shaped prestressed roof panels. Therefore, the end plate 2 and the sliding frame 3 both have through holes on their left and right sides for the rebar to pass through. The sliding frame 3 is connected to a hydraulic jack (not shown in the figure) by a wire rope. Side extension plates 4 are rotatably installed on both sides of the base 1. The shape of the side wall of the side extension plate 4 and the shape of the upper end face of the bottom mold are determined according to the shape of the corresponding side wall of the double-T-shaped prestressed roof panel to be produced.

[0032] See Figure 1 It also includes a bottom seal 6 disposed on the sliding frame 3, a side seal 5 disposed between the side extension plate 4 and the end plate 2 and between the side extension plate 4 and the bottom seal 6, and a fixing member 7 disposed between the side extension plate 4, the end plate 2 and the bottom seal 6.

[0033] like Figure 1 As shown, when the side extension plate 4 rotates to a horizontal position, it provides sliding support for the sliding frame 3, assisting in the stable execution of the tensioning action; as Figure 7As shown, when the side extension plate 4 is rotated to the vertical position, under the sealing action of the side seal 5 and the bottom seal 6, it closely cooperates with the base 1, the end plate 2 and the bottom seal 6 to form a concrete pouring template.

[0034] During the tensioning process, the side extension plate 4 is in a horizontal state. At this time, the front end of the steel bar to be tensioned needs to be passed through the through hole on the sliding frame 3 and the rear end of the steel bar needs to be passed through the through hole on the end plate 2. After the steel bar passes through the through hole, anchors are installed at the front and rear ends of the steel bar respectively. Specifically, existing clamp-type anchors can be used. Then, the hydraulic jack can be started to drive the sliding frame 3 from back to front through the wire rope, gradually applying tension to the steel bar until the steel bar is stretched from 6m to 6.5m, and the tensioning is completed.

[0035] Next, rotate the side extension plate 4 to a vertical position and fix it with the fastener 7 to form a concrete pouring template. Then, install the embedded parts and ordinary steel bars inside the template. After that, apply a release agent inside the concrete pouring template and pour concrete into the template. After the concrete has cured, cut off the part of the tensioned steel bars that is outside the template. Then, lift the formed prestressed roof panel out of the concrete pouring template. Finally, restore the side extension plate 4 to a horizontal position.

[0036] See Figure 1 The side seal 5 includes a strip plate 51 fixedly installed on the side extension plate 4, and the lower end of the sliding frame 3 is provided with a guide groove 52 that slides with the strip plate 51.

[0037] When the side extension plate 4 is in a horizontal state, the guide groove 52 at the lower end of the sliding frame 3 slides in conjunction with the strip plate 51. When the hydraulic jack drives the sliding frame 3 to move from back to front to perform the tensioning operation of the steel bars, the strip plate 51 and the guide groove 52 cooperate to provide sliding support for the sliding frame 3, maintain the consistency of the force in the tensioning direction, and thus ensure the tensioning effect of the steel bars.

[0038] After the steel reinforcement is tensioned, the sliding frame 3 moves to the front of the side extension plate 4, and the guide groove 52 disengages from the strip plate 51. At this time, the side extension plate 4 can be rotated to a vertical state. In this state, the strip plate 51 rotates to the space between the side extension plate 4 and the side wall of the base 1 to fill the gap between the side extension plate 4 and the base 1, preventing concrete from overflowing during pouring.

[0039] It should be noted that guide bars that slide in cooperation with guide grooves 52 can be fixed on the left and right sides of the base 1. When the sliding frame 3 moves to the front of the side extension plate 4, the guide grooves 52 cooperate with the guide bars to limit the left and right positions of the sliding frame 3.

[0040] See Figure 1 , Figure 3 and Figure 5The bottom sealing element 6 includes a mounting plate 61 fixedly installed on the rear side of the sliding frame 3. The mounting plate 61 has a mounting groove inside, and a bottom sealing strip 62 is slidably installed in the mounting groove. There is a gap between the lower end face of the mounting plate 61 and the upper end face of the base 1. During the tensioning operation, the bottom sealing strip 62 is completely located inside the mounting groove, and the lower end face of the bottom sealing strip 62 is in concave-convex shape with the upper end face of the base 1.

[0041] See Figure 1 , Figure 4 and Figure 5 The end plate 2 also has an installation groove inside. The side seal 5 also includes side sealing strips 53 on both the left and right sides of the end plate 2 and the mounting plate 61. The side sealing strip 53 is pasted on the base plate 54 on the side near the installation groove. A sliding block 55 is fixedly installed on the side of the base plate 54 near the installation groove. The end of the sliding block 55 away from the base plate 54 is located in the installation groove and a translation block 56 is fixedly installed thereon. The side of the translation block 56 away from the sliding block 55 is an inclined surface and is in contact with the lower end face of the lifting block 57 that is slidably installed in the installation groove. A helical spring is connected between the translation block 56 and the installation groove.

[0042] See Figure 2 , Figure 4 and Figure 7 A round rod 58 is fixedly installed on the upper end of the lifting block 57. The upper end of the round rod 58 slides through the mounting groove. When the side extension plate 4 rotates from a horizontal state to a vertical state, the fixing block 73 rotates above the round rod 58 and applies downward pressure to the round rod 58, causing the round rod 58 to drive the lifting block 57 to move downward. The lifting block 57 generates downward pressure on the inclined surface of the translation block 56. The inclined surface converts part of the downward pressure into a horizontal force, causing the translation block 56 to drive the base plate 54 to slide outward through the sliding block 55, thereby driving the side sealing strip 53 to press tightly onto the corresponding side extension plate 4, completing the enhanced sealing of the concrete pouring formwork joint.

[0043] A lifting plate 59 is installed at the lower end of the lifting block 57 via a connecting rod. The lower end face of the lifting plate 59 corresponding to the mounting plate 61 is in concave-convex fit with the upper end face of the base 1 and a bottom sealing strip 62 is adhered thereto. When the lifting block 57 in the mounting plate 61 moves downward, the lifting plate 59 is moved downward through the connecting rod, so that the bottom sealing strip 62 is in contact with the upper end face of the base 1, preventing concrete from overflowing from the gap between the mounting plate 61 and the base 1 and affecting the molding quality.

[0044] With the cooperation of the above structures, after the steel reinforcement is tensioned, the position of the side extension plate 4 is changed, so that the tensioning equipment is converted into a concrete pouring formwork, and the side extension plate 4 and the sliding frame 3 are fixed and the formwork joints are reinforced and sealed at the same time. This simplifies the formwork splicing process and ensures the forming quality of the double T-shaped prestressed roof panel.

[0045] See Figure 1 , Figure 2 and Figure 7 The fixing component 7 includes a positioning hole 71 and a positioning hole 72. The upper surfaces of the end plate 2 and the mounting plate 61 are symmetrically provided with positioning holes 71. The front and rear ends of the side extension plate 4 are fixedly provided with fixing blocks 73 corresponding to positioning holes 71. The fixing blocks 73 are provided with positioning holes 72.

[0046] When the side extension plate 4 rotates from a horizontal state to a vertical state, the positioning hole 72 on the fixing block 73 corresponds vertically to the positioning hole 71. At this time, the positioning pin (not shown in the figure) can be inserted between the corresponding positioning hole 71 and positioning hole 72 to quickly complete the fixing, maintain the vertical state of the side extension plate 4, and limit the front and rear position of the sliding frame 3, so that the side extension plate 4, end plate 2, mounting plate 61 and base 1 form a concrete pouring template.

[0047] When the side extension plate 4 needs to be restored from a vertical state to a horizontal state, the positioning pin is pulled out from the positioning hole 1 71 and positioning hole 2 72, and the side extension plate 4 is rotated in the opposite direction. The fixing block 73 and the round rod 58 are no longer in contact, and the downward pressure on the round rod 58 disappears. Under the elastic force of the helical spring, the translation block 56 drives the side sealing strip 53 to return to the initial position through the base plate 54. At the same time, the lifting block 57 also drives the lifting plate 59 to return to the initial height. The bottom sealing strip 62 returns to the installation groove to prevent the bottom sealing strip 62 from rubbing against the upper surface of the base 1 and causing wear during the subsequent tensioning process.

[0048] Since there is a certain gap between the bottom sealing strip 62 and the upper surface of the base 1 in the initial state, the distance that the bottom sealing strip 62 needs to move from the initial state to the state of being in close contact with the upper surface of the base 1 may be greater than the distance that the side sealing strip 53 needs to move from the initial state to the state of being in close contact with the side extension plate 4. Therefore, if Figure 4 As shown, the sliding block 55 can be set as an elastic structure that can extend and retract left and right. When the side sealing strip 53 is completely in contact with the side extension plate 4, the round rod 58 drives the lifting block 57 to continue to move down. During this process, the sliding block 55 undergoes elastic deformation in the left and right direction and shortens. When the side extension plate 4 returns to the horizontal state, the sliding block 55 also returns to its original position and length.

[0049] See Figure 5 and Figure 6 The base 1 has receiving grooves 11 on its left and right sides. Hollow sealing strips 13 are attached to the left and right sides of the base 1. The hollow sealing strips 13 cover the outside of the receiving grooves 11. A long strip plate 12 is slidably installed in the receiving grooves 11. The side of the long strip plate 12 away from the receiving grooves 11 extends into the hollow sealing strip 13. The side of the long strip plate 12 close to the receiving grooves 11 is symmetrically fixed with pressure posts 14. A square hole communicating with the receiving grooves 11 is opened above the receiving grooves 11. There are two square holes, and each square hole corresponds to one of the pressure posts 14.

[0050] Continue reading Figure 5 and Figure 6 A square rod 50 is fixedly installed at the lower end of the lifting plate 59; the rear square rod 50 is located directly above the rear square hole. After tensioning is completed, the front square rod 50 moves to directly above the front square hole.

[0051] As the lifting plate 59 moves downward, the square rod 50 moves downward as well, passing through the square hole and exerting a pushing force on the pressure column 14 below it. The pressure column 14 drives the long strip 12 to move inside the hollow sealing strip 13. Finally, the long strip 12 is pressed tightly against the inner wall of the hollow sealing strip 13, squeezing the hollow sealing strip 13 and making the hollow sealing strip 13 fit tightly against the strip plate 51, further sealing the gap between the strip plate 51 and the base 1, effectively preventing concrete from overflowing at the joint. At the same time, the front square hole and the front square rod 50 cooperate to indirectly further limit the position of the sliding frame 3, ensuring the stability of the formed concrete pouring template, and thus indirectly improving the forming effect of the prestressed roof panel.

[0052] In this invention, the side sealing strip 53, bottom sealing strip 62, and hollow sealing strip 13 are all made of closed-cell foamed polyethylene. The lengths of the side sealing strip 53, bottom sealing strip 62, hollow sealing strip 13, and strip plate 51 are all determined by measurement and calculation by those skilled in the art to ensure a tight fit at the joints of the concrete pouring template composed of base 1, end plate 2, side extension plate 4, and mounting plate 61.

[0053] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0054] In the description of this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0055] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0056] The foregoing has provided a detailed description of a steel bar tensioning device based on prestressed concrete products provided by the present invention. For those skilled in the art, based on the ideas of the embodiments of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A steel bar tensioning device based on prestressed concrete products, characterized in that, The base includes a base with an end plate fixed at one end and a sliding frame horizontally slidable at the other end. The end plate and the sliding frame have through holes on both the left and right sides for the reinforcing bars to pass through. The sliding frame is connected to a hydraulic jack by a steel wire rope. Side extension plates are rotatably installed on both sides of the base. Also includes: Bottom seal installed on the sliding frame; Side seals are installed between the side extension plate and the end plate, and between the side extension plate and the bottom seal. A fastener is installed between the side extension plate, the end plate, and the bottom seal to fix the position of the side extension plate; The side sealing element includes a strip plate fixedly installed on the side extension plate, and a guide groove that slides with the strip plate is provided at the lower end of the sliding frame; The bottom seal includes a mounting plate fixedly installed on the rear side of the sliding frame. The mounting plate has a mounting groove inside, and a bottom sealing strip is slidably installed in the mounting groove. There is a gap between the lower end face of the mounting plate and the upper end face of the base. The lower end face of the bottom sealing strip and the upper end face of the base are in concave-convex shape matching. The end plate also has an installation groove inside. The side sealing component includes side sealing strips on both the left and right sides of the end plate and the mounting plate. The side sealing strip is pasted to the base plate on the side near the installation groove. A sliding block is fixedly installed on the side of the base plate near the installation groove. The end of the sliding block away from the base plate is located in the installation groove and a translation block is fixedly installed thereon. The side of the translation block away from the sliding block is an inclined surface and fits against the lower end face of the lifting block that slides up and down in the installation groove. A helical spring connects the translation block and the installation groove. A lifting plate is installed at the lower end of the lifting block through a connecting rod. The lower end face of the lifting plate corresponding to the mounting plate is in concave-convex fit with the upper end face of the base and is adhered with a bottom sealing strip. The fastener includes positioning hole one and positioning hole two. Positioning hole one is symmetrically opened on the upper surface of the end plate and the mounting plate. Fixing blocks corresponding to positioning hole one are fixedly installed at both ends of the side extension plate. Positioning hole two is opened on the fixing blocks. A round rod is fixedly installed on the upper end of the lifting block. The upper end of the round rod slides through the mounting groove. When the side extension plate rotates from a horizontal state to a vertical state, the fixed block rotates above the round rod and applies downward pressure to the round rod. The positioning hole 2 on the fixed block corresponds vertically to the positioning hole 1. When the side extension plate rotates to the horizontal position, it provides sliding support for the sliding frame and assists in the stable tensioning action; when the side extension plate rotates to the vertical position, it closely cooperates with the base, end plate and bottom seal under the sealing action of the side seal and bottom seal to form a concrete pouring template.

2. The steel bar tensioning device based on prestressed concrete products according to claim 1, characterized in that, The base has receiving grooves on its left and right sides, and hollow sealing strips are attached to the left and right sides of the base. The hollow sealing strips cover the outside of the receiving grooves. A long strip is slidably installed in the receiving grooves. The side of the long strip away from the receiving groove extends into the hollow sealing strip. The side of the long strip close to the receiving groove is symmetrically fixed with pressure columns. There are two square holes above the receiving groove that communicate with it, and each square hole corresponds to one of the pressure columns.

3. A steel bar tensioning device based on prestressed concrete products according to claim 2, characterized in that, A square rod is fixedly installed at the lower end of the lifting plate; the rear square rod is located directly above the rear square hole, and after tensioning is completed, the front square rod moves to directly above the front square hole.

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