Reinforcing steel bar tensioning equipment based on prestressed building concrete product

Abstract

The invention relates to the technical field of building concrete product forming, in particular to steel bar tensioning equipment based on a prestressed building concrete product, which comprises a base, a sliding frame, an end plate and a side extension plate, the device further comprises a side sealing piece, a bottom sealing piece and a fixing piece. The problem that a tensioning pedestal is separated from a side template in a traditional process is solved, function switching of a tensioning guide support and a concrete forming template is completed on the same equipment through rotation of a side extension plate, the subsequent independent working procedures of mounting and dismounting the side template are omitted, the production period is greatly shortened, the turnover rate of a production line is increased, and the production efficiency is improved. When the side extension plate is converted into a vertical state and locked, the side sealing strip and the bottom sealing strip are automatically pressed through mechanical linkage, concrete slurry leakage is effectively prevented, and the problems that due to slurry leakage, the surface of a component is defective, the interior is not compact, and a reinforcing steel bar protection layer fails are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building concrete product forming, in particular to a steel bar tensioning equipment based on pre-stressed building concrete products. BACKGROUND

[0002] The pre-stress is the compressive stress applied to the structure in advance during construction to improve the structural performance, which is commonly used in concrete structures. Among them, the pre-stressed roof panel is a high-performance building component integrating load bearing, enclosure, waterproofing, and thermal insulation, etc. It is suitable for various buildings requiring large span, high performance, and rapid construction. The most widely used is the double T-shaped roof panel.

[0003] At present, the double T-shaped roof panel is usually made by the pretensioning method, that is, the pre-stressed steel bars are first tensioned and temporarily anchored, and then the ordinary steel bars and pre-embedded parts are installed. After that, the concrete is poured into the formwork, and the pre-stressed steel bars are cut off from both ends after the concrete is cured to the specified strength, so that the double T-shaped roof panel obtains pre-stress.

[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 directly performed on the assembled formwork, not only the operation space is narrow, but also the tensioning equipment lacks limiting and guiding, which cannot guarantee the consistency of the tensioning force. In severe cases, it will lead to the failure of the pre-stressed system and affect the structural safety.

[0005] Therefore, at present, the end of the steel bar needs to be fixed by a pedestal, which serves as a guiding structure for the tensioning action of the tensioning equipment. The pedestal is generally a concrete structure, which is integrated with the ground by pouring concrete and has strong bearing capacity. After tensioning with the pedestal, a side formwork needs to be installed inside the pedestal, and the side formwork needs to be removed after the concrete is poured. The installation and removal of the side formwork both need to consume a certain amount of time, and the gap between the side formwork and the base after installation is easy to seep out of the concrete, that is, to leak the concrete. The cross-section defect and strength reduction caused by the leakage of the concrete will directly weaken the bearing capacity of the double T-shaped roof panel and affect the forming quality. SUMMARY

[0006] Therefore, the purpose of the present application is to provide a steel bar tensioning equipment based on pre-stressed building concrete products to solve the technical problems existing in the prior art. The equipment includes a base, one end of the base is fixedly provided with an end plate, the other end of the base is horizontally slidably provided with a sliding frame, the end plate and the sliding frame are both provided with through holes for the steel bars to pass through, the sliding frame is connected with a hydraulic jack through a steel wire rope, and side extension plates are rotatably arranged on both sides of the base. A side sealing element is arranged between the side extension plate and the end plate and between the side extension plate and the sliding frame. A bottom sealing element is arranged on the sliding frame. A fixing element is arranged between the side extension plate, the end plate, and the sliding frame to fix the position of the side extension plate.

[0007] When the side extension plate is rotated to the horizontal state, sliding support is provided for the sliding frame, and the stable tensioning operation is assisted; when the side extension plate is rotated to the vertical state, under the sealing action of the side sealing element and the bottom sealing element, the side extension plate is tightly matched with the base, the end plate and the bottom sealing element, and a concrete pouring formwork is formed.

[0008] Preferably, the side sealing element comprises a strip-shaped plate fixedly installed on the side extension plate, and a guide groove slidingly matched with the strip-shaped plate is formed in the lower end of the sliding frame.

[0009] Preferably, the bottom sealing element comprises a mounting plate fixedly arranged on the rear side of the sliding frame, and a mounting groove is arranged in the mounting plate, a bottom sealing strip is slidingly arranged in the mounting groove, and a gap exists between the lower end surface of the mounting plate and the upper end surface of the base, and the lower end surface of the bottom sealing strip is matched with the upper end surface of the base in a concave-convex manner.

[0010] Preferably, a mounting groove is also formed in the end plate, the side sealing element further comprises side sealing strips arranged on the left and right sides of the end plate and the mounting plate, one side of the side sealing strip close to the mounting groove is pasted on the base plate, a sliding block is fixedly arranged on one side of the base plate close to the mounting groove, one end of the sliding block away from the base plate is located in the mounting groove and fixedly arranged with a translation block, one side of the translation block away from the sliding block is a slope and is matched with the lower end surface of a lifting block slidingly arranged in the mounting groove, and a helical spring is connected between the translation block and the mounting groove.

[0011] Preferably, the fixing element comprises a positioning hole one and a positioning hole two, the positioning hole one is symmetrically formed in the upper end surface of the end plate and the mounting plate, the fixing block corresponding to the positioning hole one is fixedly arranged at the front and rear ends of the side extension plate, and the positioning hole two is formed in the fixing block.

[0012] Preferably, the upper end of the lifting block is fixedly installed with a round rod, and the upper end of the round rod slidingly penetrates the mounting groove.

[0013] Preferably, the left and right sides of the base are provided with accommodating grooves, and hollow sealing strips are adhered to the left and right sides of the base, the hollow sealing strips are arranged outside the accommodating grooves, a long strip plate is slidingly installed in the accommodating grooves, one side of the long strip plate away from the accommodating grooves extends into the hollow sealing strips, and the long strip plate is symmetrically fixed with pressing columns on one side close to the accommodating grooves, square holes are formed in the accommodating grooves and communicate with the accommodating grooves, the number of the square holes is two and corresponds to the pressing columns one by one.

[0014] Preferably, the lower end of the lifting plate is fixedly installed with a square rod, the square rod on the rear side is located directly above the square hole on the rear side, and after the tensioning is completed, the square rod on the front side moves to be directly above the square hole on the front side.

[0015] As can be seen from the above technical solutions, the steel bar tensioning equipment for pre-stressed building concrete products has the following beneficial effects: 1. The present application solves the problem of separation of the tensioning bed and the side mold plate in the traditional process. Through the rotation of the side extension plate, the function switching of the tensioning guide support and the concrete forming mold plate is completed on the same device, eliminating the independent process of subsequent installation and removal of the side mold plate, greatly shortening the production cycle and improving the production line turnover rate.

[0016] 2. When the side extension plate in the present application is turned to the vertical state and locked, the side sealing strip and the bottom sealing strip are automatically pressed by mechanical linkage, effectively preventing concrete leakage, avoiding the problems of surface defects of the component, internal non-compaction and ineffective steel reinforcement layer, etc. caused by leakage, thereby ensuring the forming quality and structural durability of the prestressed roof panel.

[0017] 3. When the side extension plate in the present application is turned to the horizontal state, the strip plate thereon cooperates with the guide groove on the sliding frame to provide stable sliding support and accurate guidance for the tensioning process, ensuring the stability of the tensioning force direction and avoiding the risks of prestress loss, stress concentration or broken reinforcement caused by the non-straight tensioning path, ensuring the accuracy and effectiveness of the prestress establishment.

[0018] 4. The present application has the functions of tensioning bed and mold plate, reducing the dependence on special fixed concrete bed, saving the space and construction cost of the prefabrication field, realizing the recycling use of the equipment, and meeting the development trend of prefabrication production intensification and tooling. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below in combination with the drawings and examples.

[0020] Figure 1 is a perspective view of the present application when the side extension plate is in the horizontal state.

[0021] Figure 2 is a perspective view of the present application after removing part of the structure.

[0022] Figure 3 is a perspective view of the base, mounting plate, side extension plate, bottom sealing strip, etc.

[0023] Figure 4 is Figure 3 is an enlarged view of the structure at A in the present application.

[0024] Figure 5 is a front view of the base, mounting plate, side extension plate, bottom sealing strip, etc.

[0025] Figure 6 is Figure 5 is an enlarged view of the structure at B in the present application.

[0026] Figure 7 is a perspective view of the present application when the side extension plate is in the vertical state.

[0027] 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

[0028] 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.

[0029] 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.

[0030] See Figure 1 It also includes 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 sliding frame 3, a bottom seal 6 disposed on the sliding frame 3, and a fixing member 7 disposed between the side extension plate 4, the end plate 2 and the sliding frame 3.

[0031] 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 7 As 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.

[0032] When the tensioning operation is performed, the side extension plate 4 is in a horizontal state, at this time, the front end of the steel bar to be tensioned is required to pass through the through hole on the sliding frame 3, the rear end of the steel bar is required to pass through the through hole on the end plate 2, and after the steel bar passes through the through hole, the anchorage device is installed at the front and rear ends of the steel bar respectively, specifically, the existing clamping piece type anchorage device can be selected, then the hydraulic jack can be started, the sliding frame 3 is driven by the steel wire rope to move from the rear to the front, the tensioning force is gradually applied to the steel bar, and the tensioning is completed until the steel bar is elongated from 6 m to 6.5 m.

[0033] Then, the side extension plate 4 is rotated to a vertical state and is fixed by the fixing member 7 to form a concrete pouring formwork, then the embedded part and the ordinary steel bar are installed in the formwork, then the release agent is smeared in the concrete pouring formwork, the concrete is poured into the concrete pouring formwork, when the concrete curing is completed, the part of the tensioned steel bar located outside the formwork is cut off, then the formed prestressed roof panel is hoisted out of the concrete pouring formwork, and finally the side extension plate 4 is restored to the horizontal state.

[0034] Referring to Figure 1 , the side sealing member 5 comprises a strip-shaped plate 51 fixedly installed on the side extension plate 4, and a guide groove 52 is formed at the lower end of the sliding frame 3 and is in sliding cooperation with the strip-shaped plate 51.

[0035] When the side extension plate 4 is in a horizontal state, the guide groove 52 at the lower end of the sliding frame 3 is in sliding cooperation with the strip-shaped plate 51, when the hydraulic jack drives the sliding frame 3 to move from the rear to the front to perform the tensioning operation of the steel bar, the strip-shaped plate 51 cooperates with the guide groove 52 to slide and support the sliding frame 3, maintains the consistency of the tensioning direction force, and further guarantees the tensioning effect of the steel bar.

[0036] After the tensioning of the steel bar is completed, the sliding frame 3 moves to the front side of the side extension plate 4, the guide groove 52 is separated from the strip-shaped plate 51, at this time, the side extension plate 4 can be rotated to a vertical state, in this state, the strip-shaped plate 51 is rotated to the gap 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, so that the concrete is prevented from overflowing during pouring.

[0037] It should be noted that the guide strips in sliding cooperation with the guide groove 52 can be fixedly arranged on the left and right sides of the base 1, when the sliding frame 3 moves to the front side of the side extension plate 4, the guide groove 52 cooperates with the guide strips to limit the left and right positions of the sliding frame 3.

[0038] Referring to Figure 1 , Figure 3 and Figure 5 ​The bottom sealing piece 6 comprises a mounting plate 61 fixedly arranged at the rear side of the sliding frame 3, and a mounting groove is arranged in the mounting plate 61, and a bottom sealing strip 62 is slidingly arranged in the mounting groove in an up-down direction, and the lower end surface of the mounting plate 61 is spaced apart from the upper end surface of the base 1, and during the tensioning operation, the bottom sealing strip 62 is completely located in the mounting groove, and the lower end surface of the bottom sealing strip 62 is in concave-convex cooperation with the upper end surface of the base 1.

[0039] Referring to Figure 1 , Figure 4 and Figure 5 , the end plate 2 is also provided with a mounting groove, and the side sealing piece 5 further comprises side sealing strips 53 arranged on the left and right sides of the end plate 2 and the mounting plate 61, one side of the side sealing strip 53 close to the mounting groove is attached to the base plate 54, the base plate 54 is fixedly provided with a sliding block 55 on the side close to the mounting groove, one end of the sliding block 55 away from the base plate 54 is located in the mounting groove and fixedly provided with a translation block 56, the side of the translation block 56 away from the sliding block 55 is a slope and is attached to the lower end surface of a lifting block 57 slidingly arranged in the mounting groove in an up-down direction, and a helical spring is connected between the translation block 56 and the mounting groove.

[0040] Referring to Figure 2 , Figure 4 and Figure 7 , the lifting block 57 is fixedly provided with a round rod 58 on the upper end, and the round rod 58 slidingly penetrates through the mounting groove, when the side extension plate 4 is rotated from the horizontal state to the vertical state, the fixed block 73 is rotated to the upper side of the round rod 58 and applies a downward pressure to the round rod 58, so that the round rod 58 drives the lifting block 57 to move downward, the lifting block 57 applies a downward pressure to the slope of the translation block 56, and the slope converts part of the downward pressure into horizontal force, so that the translation block 56 drives the base plate 54 to slide outward through the sliding block 55, and further drives the side sealing strip 53 to be pressed against the corresponding side extension plate 4, thereby completing the reinforced sealing of the joint of the concrete pouring formwork.

[0041] The lower end of the lifting block 57 is provided with a lifting plate 59 through a connecting rod, and the lower end surface of the lifting plate 59 corresponding to the mounting plate 61 is in concave-convex cooperation with the upper end surface of the base 1 and adheres to the bottom sealing strip 62; while the lifting block 57 in the mounting plate 61 moves downward, the lifting plate 59 is driven to move downward through the connecting rod, so that the bottom sealing strip 62 is attached to the upper end surface of the base 1, thereby avoiding the overflow of concrete from the gap between the mounting plate 61 and the base 1, and affecting the forming quality.

[0042] Through the cooperation of the above structure, after the reinforcement tensioning is completed, the position state of the side extension plate 4 is converted, the tensioning equipment is converted into the concrete pouring formwork, and the fixing of the side extension plate 4 and the sliding frame 3 and the reinforced sealing of the joint of the formwork are simultaneously realized, thereby simplifying the formwork splicing process and ensuring the forming quality of the double-T prestressed roof panel.

[0043] Referring toFigure 1 、 Figure 2 With Figure 7 , the fixing part 7 includes positioning hole one 71 and positioning hole two 72, the end plate 2 and the upper end surface of the mounting plate 61 are symmetrically provided with the positioning hole one 71, and the front and rear ends of the side extension plate 4 are fixedly provided with the fixed block 73 corresponding to the positioning hole one 71, and the fixed block 73 is provided with the positioning hole two 72.

[0044] When the side extension plate 4 is rotated from the horizontal state to the vertical state, the positioning hole two 72 on the fixed block 73 corresponds to the positioning hole one 71, at this time, the positioning pin (not shown in the figure) can be inserted between the corresponding positioning hole one 71 and the positioning hole two 72, and the vertical state of the side extension plate 4 can be quickly fixed and maintained, and the front and rear positions of the sliding frame 3 are limited, so that the side extension plate 4, the end plate 2, the mounting plate 61 and the base 1 form a concrete pouring formwork.

[0045] When the side extension plate 4 needs to be restored to the horizontal state from the vertical state, the positioning pin is pulled out from the positioning hole one 71 and the positioning hole two 72, and the side extension plate 4 is reversely rotated, the fixed block 73 is no longer in contact with the round rod 58, the downward pressure on the round rod 58 disappears, and under the elastic force of the spiral spring, the translation block 56 drives the side sealing strip 53 to return to the initial position through the base plate 54, and the lifting block 57 also drives the lifting plate 59 to return to the initial height, and the bottom sealing strip 62 returns to the inside of the mounting groove, so as to avoid the mutual friction between the bottom sealing strip 62 and the upper end surface of the base 1 in the subsequent tensioning process.

[0046] Because there is a certain gap between the bottom sealing strip 62 and the upper end 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 close to the upper end 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 close to the side extension plate 4, therefore, as shown in Figure 4 , the sliding block 55 can be designed as an elastic structure that can be extended and retracted left and right, when the side sealing strip 53 is completely close to the side extension plate 4, the round rod 58 drives the lifting block 57 to continue to move downward, and the sliding block 55 is elastically deformed in the left and right directions to shorten, and when the side extension plate 4 returns to the horizontal state, the sliding block 55 also returns to the original position and length.

[0047] Referring to Figure 5 and Figure 6 , the base 1 is provided with a receiving groove 11 on the left and right sides, and a hollow sealing strip 13 is adhered to the left and right sides of the base 1, the hollow sealing strip 13 covers the outside of the receiving groove 11, a long strip plate 12 is slidably installed in the receiving groove 11, one side of the long strip plate 12 away from the receiving groove 11 extends into the hollow sealing strip 13, and the side of the long strip plate 12 close to the receiving groove 11 is fixed with a pressing column 14 symmetrically in front and back, a square hole is formed in the upper part of the receiving groove 11 and communicates with the receiving groove 11, and the number of the square holes is two and corresponds to the pressing column 14 one by one.

[0048] With reference to the drawings Figure 5 With Figure 6 The lower end of the lifting plate 59 is fixedly installed with a square rod 50; the square rod 50 at the rear side is located directly above the square hole at the rear side, and after tensioning is completed, the square rod 50 at the front side is moved to be directly above the square hole at the front side.

[0049] When the lifting plate 59 moves downward, the square rod 50 moves downward along with it and passes through the square hole to generate a pushing force on the pressing column 14 below, the pressing column 14 drives the long strip plate 12 to move inside the hollow sealing strip 13, and finally the long strip plate 12 is tightly attached to the inner wall of the hollow sealing strip 13, the hollow sealing strip 13 is extruded, the hollow sealing strip 13 is tightly attached to the strip-shaped plate 51, the gap between the strip-shaped plate 51 and the base 1 is further sealed, and concrete overflow at the joint is effectively avoided. At the same time, the square hole at the front side cooperates with the square rod 50 at the front side, and also indirectly plays a further limiting role on the position of the sliding frame 3, guarantees the stability of the formed concrete pouring formwork, and further indirectly improves the forming effect of the prestressed roof panel.

[0050] The side sealing strip 53, the bottom sealing strip 62 and the hollow sealing strip 13 in the application are all closed-cell foam polyethylene materials. The lengths of the side sealing strip 53, the bottom sealing strip 62, the hollow sealing strip 13 and the strip-shaped plate 51 are determined by measurement and calculation by the person skilled in the art, so as to guarantee the close fit of the joint of the concrete pouring formwork composed of the base 1, the end plate 2, the side extension plate 4 and the mounting plate 61.

[0051] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0052] In the description of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0053] In the description of the present application, it is also necessary to explain that, unless explicitly defined and limited, the terms "set", "connected", "mounted", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] The above describes in detail the steel bar tensioning equipment based on the pre-stressed building concrete product provided by the present application. For those skilled in the art, the specific implementation and application range of the present application will be changed according to the idea of the embodiment of the present application. In view of the above, the content of the present application should not be understood as a limitation of the present application.

Claims

1. A steel bar tensioning apparatus for pre-stressed construction concrete products, characterized by, The utility model provides a reinforced concrete formwork, including base, one end of base is fixedly provided with end plate, the other end of base is horizontally slidably provided with sliding frame, and the left and right sides of end plate and sliding frame are all provided with through hole for reinforcing steel bar to pass through, sliding frame is connected with hydraulic jack through steel wire rope, and the left and right sides of base are all rotatably provided with side extension plate; Further comprising: A side sealing element disposed between the side extension plate and the end plate and between the side extension plate and the sliding frame; A bottom sealing element disposed on the sliding frame; A fixing element disposed between the side extension plate, the end plate and the sliding frame, for fixing the position of the side extension plate; When the side extension plate is rotated to a horizontal state, the sliding frame is provided with sliding support, and the stable tensioning action is assisted; when the side extension plate is rotated to a vertical state, under the sealing action of the side sealing element and the bottom sealing element, the side extension plate is tightly matched with the base, the end plate and the bottom sealing element, thereby forming a concrete pouring formwork.

2. A steel tendon tensioning apparatus for pre-stressed concrete construction products as claimed in claim 1 wherein, The side sealing element comprises a strip-shaped plate fixedly installed on the side extension plate, and the lower end of the sliding frame is provided with a guide groove in sliding cooperation with the strip-shaped plate.

3. A steel tendon tensioning apparatus for pre-stressed concrete construction products as claimed in claim 2 wherein, The bottom sealing element comprises an installation plate fixedly provided on the rear side of the sliding frame, and the installation plate is internally provided with an installation groove, and a bottom sealing strip is slidably arranged in the installation groove in an up-down direction; the lower end surface of the bottom sealing strip is in concave-convex cooperation with the upper end surface of the base.

4. A steel tendon tensioning apparatus for pre-stressed concrete construction products as claimed in claim 3 wherein, The end plate is also internally provided with an installation groove, and the side sealing element further comprises a side sealing strip provided on the left and right sides of the end plate and the installation plate, one side of the side sealing strip close to the installation groove is pasted on the base plate, the base plate is fixedly provided with a sliding block on the side close to the installation groove, one end of the sliding block away from the base plate is located in the installation groove and fixedly provided with a translation block, and the side of the translation block away from the sliding block is a slope and is in abutment with the lower end surface of a lifting block slidably arranged in the installation groove in an up-down direction; the translation block and the installation groove are connected with a spiral spring.

5. A steel tendon tensioning apparatus for pre-stressed concrete construction products as claimed in claim 4 wherein, The fixing element comprises a first positioning hole and a second positioning hole, and the upper end surfaces of the end plate and the installation plate are both provided with the first positioning hole in a front-rear symmetry manner; the front and rear ends of the side extension plate are both fixedly provided with a fixing block corresponding to the first positioning hole, and the fixing block is provided with the second positioning hole.

6. A tendon tensioning apparatus for pre-stressed concrete products according to claim 5, wherein The upper end of the lifting block is fixedly installed with a round rod, and the upper end of the round rod slidably penetrates the installation groove.

7. A steel tendon tensioning apparatus for pre-stressed concrete construction products as claimed in claim 2 wherein, The left and right sides of the base are provided with accommodating grooves, and hollow sealing strips are adhered to the left and right sides of the base; the hollow sealing strips are covered outside the accommodating grooves; long strip plates are slidably installed in the accommodating grooves in a left-right direction; one side of the long strip plate away from the accommodating groove extends into the hollow sealing strip; the side of the long strip plate close to the accommodating groove is fixedly provided with a pressing column in a front-rear symmetry manner; the accommodating groove is provided with square holes in communication therewith above; the number of the square holes is two and corresponds to the pressing columns one by one.

8. A tendon tensioning apparatus for pre-stressed concrete products according to claim 7, characterised in that, The lower end of the lifting plate is fixedly installed with a square rod; the square rod on the rear side is located directly above the square hole on the rear side; after the tensioning is completed, the square rod on the front side moves to be directly above the square hole on the front side.

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