Assembly type T beam negative bending moment tensioning operation frame

Abstract

The utility model provides a kind of assembly T beam negative bending moment tensioning construction work frame, left front and left rear retractable chain are pulled to left front and left rear movable guardrail right upper, and then left movable guardrail and bottom left movable platform are pulled to right upper, so that left movable guardrail is close to front and rear fixed guardrail right upper, bottom left movable platform is rotated into inclined state right upper, right front and right rear retractable chain are pulled to right front and right rear movable guardrail left upper, and then right movable guardrail and bottom right movable platform are pulled to left upper, so that right movable guardrail is close to front and rear fixed guardrail left upper, bottom right movable platform is rotated into inclined state left upper, folding is realized, and then assembly T beam wet joint position can be lowered, and it can be unfolded after being lowered.The utility model can eliminate safety risk, prevent the occurrence of safety accident, and ensure that assembly T beam negative bending moment tensioning construction work is carried out normally and safely.

Description

Technical Field

[0001] This utility model relates to the field of beam bridge construction technology, and particularly to the field of prefabricated T-beam negative bending moment tensioning construction technology, specifically referring to a prefabricated T-beam negative bending moment tensioning construction work frame. Background Technology

[0002] With the continuous development of national infrastructure construction, beam bridges have become increasingly common in highway, railway, and municipal engineering projects. They can be prefabricated in a prefabrication yard and carried out simultaneously with the substructure work, which saves construction time and ensures construction quality and safety through standardized centralized prefabrication. They have become the most common type of bridge. Currently, beam bridges commonly adopt the simple-supported to continuous type. Generally, after the beams are prefabricated and tensioned in the prefabrication yard, they are transported to the bridge site, erected, and then the prefabricated T-beams are connected in multiple spans to form a single unit. Negative bending moment tensioning is then carried out to form a whole, completing the construction of the simple-supported to continuous type.

[0003] However, in daily construction and production, the negative bending moment tensioning operation point of the prefabricated T-beam is directly below the flange plate of the beam. Workers need to properly treat the wet joint reinforcement before they can go down to carry out the construction work. In addition, the wet joint is generally narrow and the bridge is high, making it difficult to operate the ground-mounted work platform. Therefore, workers often use simple wooden boards to wedge on the horseshoe-shaped base plate at the bottom of the beam for high-risk operations. It is also difficult to install edge protection on the work platform. If workers slip on the platform or wear safety protective equipment improperly, it will pose a serious risk of falling from height.

[0004] Therefore, there is a need to provide a prefabricated T-beam negative bending moment tensioning construction operation platform, which can eliminate safety risks, prevent safety accidents, and ensure the normal and safe conduct of prefabricated T-beam negative bending moment tensioning construction operations. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, one objective of this utility model is to provide a prefabricated T-beam negative bending moment tensioning construction work frame, which can eliminate safety risks, prevent safety accidents, and ensure the normal and safe conduct of prefabricated T-beam negative bending moment tensioning construction operations, and is suitable for large-scale promotion and application.

[0006] Another objective of this utility model is to provide a prefabricated T-beam negative bending moment tensioning construction work frame, which is ingeniously designed, simple in structure, easy to manufacture, and low in manufacturing cost, making it suitable for large-scale promotion and application.

[0007] To achieve the above objectives, this utility model provides a prefabricated T-beam negative bending moment tensioning construction work frame, characterized by comprising a front suspension rod, a rear suspension rod, a front fixed guardrail, a rear fixed guardrail, a bottom middle fixed platform, a bottom left movable platform, a left movable guardrail, a left front movable guardrail, a left rear movable guardrail, a bottom right movable platform, a right movable guardrail, a right front movable guardrail, a right rear movable guardrail, a left front take-up chain, a right front take-up chain, a left rear take-up chain, and a right rear take-up chain, wherein:

[0008] The bottom middle fixed platform is horizontally arranged along the front-to-back direction. The front fixed guardrail and the rear fixed guardrail are both vertically arranged along the left-to-right direction and are spaced apart from each other. The lower ends of the front fixed guardrail and the rear fixed guardrail are respectively fixedly connected to the front end and the rear end of the bottom middle fixed platform. The front hanger and the rear hanger are both arranged along the left-to-right direction and are spaced apart from each other. The middle part of the front hanger and the middle part of the rear hanger are respectively fixed to the upper end of the front fixed guardrail and the upper end of the rear fixed guardrail.

[0009] The bottom left and bottom right movable platforms are both horizontally arranged and aligned along the front-back direction, spaced apart from each other. The bottom left and bottom right movable platforms are located to the left and right of the bottom middle fixed platform, respectively. The right side of the bottom left movable platform and the left side of the bottom right movable platform are rotatably connected to the left and right sides of the bottom middle fixed platform, respectively, around the front-back direction. The left and right movable guardrails are both vertically arranged and aligned along the front-back direction, spaced apart from each other. The lower sides of the left and right movable guardrails are rotatably connected to the left side of the bottom left movable platform and the right side of the bottom right movable platform, respectively, around the front-back direction. The left front and left rear movable guardrails are both vertically arranged and aligned along the front-back direction. The left and right movable guardrails are arranged in a left-right direction and spaced apart from each other. The left side of the left front movable guardrail and the left side of the left rear movable guardrail are horizontally rotatably connected to the front and rear sides of the left movable guardrail, respectively. The right side of the left front movable guardrail and the right side of the left rear movable guardrail are detachably connected to the lower left side of the front fixed guardrail and the lower left side of the rear fixed guardrail, respectively. The right front movable guardrail and the right rear movable guardrail are both arranged vertically and along the left-right direction and spaced apart from each other. The right side of the right front movable guardrail and the right side of the right rear movable guardrail are horizontally rotatably connected to the front and rear sides of the right movable guardrail, respectively. The left side of the right front movable guardrail and the left side of the right rear movable guardrail are detachably connected to the lower right side of the front fixed guardrail and the lower right side of the rear fixed guardrail, respectively.

[0010] The left front retractable chain and the right front retractable chain are both inclined along the left and right directions and arranged in a V-shape relative to each other along the left and right directions. The left end of the left front retractable chain is fixed to the top left side of the left front movable guardrail, and the right end of the left front retractable chain is detachably connected to the left end of the front boom. The right end of the right front retractable chain is fixed to the top right side of the right front movable guardrail, and the left end of the right front retractable chain is detachably connected to the right end of the front boom. The left rear retractable chain and the right rear retractable chain are both inclined along the left and right directions and arranged in a V-shape relative to each other along the left and right directions. The left end of the left rear retractable chain is fixed to the top left side of the left rear movable guardrail, and the right end of the left rear retractable chain is detachably connected to the left end of the rear boom. The right end of the right rear retractable chain is fixed to the top right side of the right rear movable guardrail, and the left end of the right rear retractable chain is detachably connected to the right end of the rear boom.

[0011] Preferably, the front fixed guardrail includes a left front vertical bar, a right front vertical bar, and a front connecting bar. The left front vertical bar and the right front vertical bar are spaced apart from each other, and the front connecting bar is arranged along the left-right direction and located between the left front vertical bar and the right front vertical bar, and connects the left front vertical bar and the right front vertical bar respectively.

[0012] The rear fixed guardrail includes a left rear vertical bar, a right rear vertical bar, and a rear connecting bar. The left rear vertical bar and the right rear vertical bar are spaced apart from each other. The rear connecting bar is arranged along the left-right direction and is located between the left rear vertical bar and the right rear vertical bar, and connects the left rear vertical bar and the right rear vertical bar respectively.

[0013] The lower ends of the left front vertical bar and the right front vertical bar are both fixedly connected to the front end of the bottom middle fixed platform. The lower ends of the left rear vertical bar and the right rear vertical bar are both fixedly connected to the rear end of the bottom middle fixed platform. The middle part of the front hanging rod is fixed to the upper end of the left front vertical bar and the upper end of the right front vertical bar, respectively. The middle part of the rear hanging rod is fixed to the upper end of the left rear vertical bar and the upper end of the right rear vertical bar, respectively. The right side of the left front movable guardrail and the right side of the left rear movable guardrail are detachably connected to the lower part of the left front vertical bar and the lower part of the left rear vertical bar, respectively. The left side of the right front movable guardrail and the left side of the right rear movable guardrail are detachably connected to the lower part of the right front vertical bar and the lower part of the right rear vertical bar, respectively.

[0014] Preferably, the bottom middle fixed platform includes a left bottom rod, a right bottom rod, and a bottom middle connecting rod. The left bottom rod and the right bottom rod are both arranged along the front-back direction and are spaced apart from each other on the left and right sides. The bottom middle connecting rod is arranged along the left-right direction and is located between the left bottom rod and the right bottom rod, and connects the left bottom rod and the right bottom rod respectively.

[0015] The lower ends of the front fixed guardrail are fixedly connected to the front ends of the left and right bottom bars, respectively. The lower ends of the rear fixed guardrail are fixedly connected to the rear ends of the left and right bottom bars, respectively. The bottom left movable platform and the bottom right movable platform are located to the left of the left bottom bar and to the right of the right bottom bar, respectively. The right side of the bottom left movable platform and the left side of the bottom right movable platform are rotatably connected to the left and right bottom bars in the front-back direction, respectively.

[0016] Preferably, the bottom left movable platform includes a first left bottom rod, a second left bottom rod, a third left bottom rod, a fourth left bottom rod, and a bottom left connecting rod. The first left bottom rod and the second left bottom rod are both arranged along the front-back direction and spaced apart from each other on the left and right. The third left bottom rod and the fourth left bottom rod are both arranged along the left-right direction and spaced apart from each other on the front and back. The first left bottom rod and the second left bottom rod are both located between the third left bottom rod and the fourth left bottom rod and are both connected to the third left bottom rod and the fourth left bottom rod, respectively. The bottom left connecting rod is arranged along the front-back direction and is located between the first left bottom rod and the second left bottom rod and between the third left bottom rod and the fourth left bottom rod, and is connected to the third left bottom rod and the fourth left bottom rod, respectively.

[0017] The bottom right movable platform includes a first right bottom rod, a second right bottom rod, a third right bottom rod, a fourth right bottom rod, and a bottom right connecting rod. The second right bottom rod and the first right bottom rod are both arranged along the front-back direction and spaced apart from each other on the left and right. The third right bottom rod and the fourth right bottom rod are both arranged along the left-right direction and spaced apart from each other on the front and back. The first right bottom rod and the second right bottom rod are both located between the third right bottom rod and the fourth right bottom rod and are both connected to the third right bottom rod and the fourth right bottom rod, respectively. The bottom right connecting rod is arranged along the front-back direction and is located between the first right bottom rod and the second right bottom rod and between the third right bottom rod and the fourth right bottom rod, and is connected to the third right bottom rod and the fourth right bottom rod, respectively.

[0018] The second left bottom bar and the second right bottom bar are located on the left and right sides of the bottom middle fixed platform, respectively, and are rotatably connected to the left side of the bottom middle fixed platform and the left side of the bottom middle fixed platform, respectively, around the front and back direction. The lower side of the left movable guardrail and the lower side of the right movable guardrail are rotatably connected to the first left bottom bar and the first right bottom bar, respectively, around the front and back direction.

[0019] Preferably, the left movable guardrail includes a left front vertical bar, a left rear vertical bar, a left upper vertical bar, a left lower vertical bar, and a left connecting bar. The left front vertical bar and the left rear vertical bar are spaced apart from each other. The left upper vertical bar and the left lower vertical bar are vertically spaced apart and are both located between the left front vertical bar and the left rear vertical bar, and are both connected to the left front vertical bar and the left rear vertical bar, respectively. The left connecting bar is arranged along the front-back direction and is located between the left upper vertical bar and the left lower vertical bar, and between the left front vertical bar and the left rear vertical bar, and is connected to the left front vertical bar and the left rear vertical bar, respectively.

[0020] The right-side movable guardrail includes a right front vertical bar, a right rear vertical bar, a right upper vertical bar, a right lower vertical bar, and a right connecting bar. The right front vertical bar and the right rear vertical bar are spaced apart from each other. The right upper vertical bar and the right lower vertical bar are vertically spaced apart and are both located between the right front vertical bar and the right rear vertical bar, and are both connected to the right front vertical bar and the right rear vertical bar, respectively. The right connecting bar is arranged along the front-back direction and is located between the right upper vertical bar and the right lower vertical bar, as well as between the right front vertical bar and the right rear vertical bar, and is connected to the right front vertical bar and the right rear vertical bar, respectively.

[0021] The lower left vertical bar and the lower right vertical bar are rotatably connected to the left side of the bottom left movable platform and the right side of the bottom right movable platform, respectively, around the front-left movable guardrail. The left side of the left front movable guardrail and the left side of the left rear movable guardrail are horizontally rotatably connected to the left front vertical bar and the left rear vertical bar, respectively. The right side of the right front movable guardrail and the right side of the right rear movable guardrail are horizontally rotatably connected to the right front vertical bar and the right rear vertical bar, respectively.

[0022] Preferably, the left front movable guardrail includes a first left front vertical bar, a second left front vertical bar, and a left front connecting bar. The first left front vertical bar and the second left front vertical bar are spaced apart from each other. The left front connecting bar is arranged along the left-right direction and is located between the first left front vertical bar and the second left front vertical bar, and connects the first left front vertical bar and the second left front vertical bar respectively. There are multiple left front connecting bars, which are arranged vertically spaced apart from each other.

[0023] The left rear movable guardrail includes a first left rear vertical bar, a second left rear vertical bar, and a left rear connecting bar. The first left rear vertical bar and the second left rear vertical bar are spaced apart from each other. The left rear connecting bar is arranged along the left-right direction and is located between the first left rear vertical bar and the second left rear vertical bar, and connects the first left rear vertical bar and the second left rear vertical bar respectively. There are multiple left rear connecting bars, which are arranged vertically spaced apart from each other.

[0024] The first left front vertical bar and the first left rear vertical bar are horizontally rotatably connected to the front side of the left movable guardrail and the rear side of the left movable guardrail, respectively. The second left front vertical bar and the second left rear vertical bar are detachably connected to the lower left side of the front fixed guardrail and the lower left side of the rear fixed guardrail, respectively. The left end of the left front retractable chain is fixed to the left end of the uppermost left front connecting rod, and the left end of the left rear retractable chain is fixed to the left end of the uppermost left rear connecting rod.

[0025] Preferably, the right front movable guardrail includes a first right front vertical bar, a second right front vertical bar, and a right front connecting bar. The second right front vertical bar and the first right front vertical bar are spaced apart from each other on the left and right sides. The right front connecting bar is arranged along the left and right direction and is located between the first right front vertical bar and the second right front vertical bar, and connects the first right front vertical bar and the second right front vertical bar respectively. There are multiple right front connecting bars, and the multiple right front connecting bars are arranged vertically spaced apart from each other.

[0026] The right rear movable guardrail includes a first right rear vertical bar, a second right rear vertical bar, and a right rear connecting bar. The second right rear vertical bar and the first right rear vertical bar are spaced apart from each other on the left and right sides. The right rear connecting bar is arranged along the left and right direction and is located between the first right rear vertical bar and the second right rear vertical bar, and connects the first right rear vertical bar and the second right rear vertical bar respectively. There are multiple right rear connecting bars, which are arranged vertically spaced apart from each other.

[0027] The first right front vertical bar and the first right rear vertical bar are horizontally rotatably connected to the front side of the right movable guardrail and the rear side of the right movable guardrail, respectively. The second right front vertical bar and the second right rear vertical bar are detachably connected to the lower right side of the front fixed guardrail and the lower right side of the rear fixed guardrail, respectively. The right end of the right front take-up chain is fixed to the right side of the uppermost right front connecting rod, and the right end of the right rear take-up chain is fixed to the right side of the uppermost right rear connecting rod.

[0028] Preferably, the prefabricated T-beam negative bending moment tensioning construction frame further includes a left front fixing buckle, a right front fixing buckle, a left rear fixing buckle, and a right rear fixing buckle. The left front fixing buckle, the right front fixing buckle, the left rear fixing buckle, and the right rear fixing buckle are respectively disposed on the left end of the front suspension rod, the right end of the front suspension rod, the left end of the rear suspension rod, and the right end of the rear suspension rod. The right end of the left front take-up chain, the left end of the right front take-up chain, the right end of the left rear take-up chain, and the left end of the right rear take-up chain are detachably connected to the left front fixing buckle, the right front fixing buckle, the left rear fixing buckle, and the right rear fixing buckle.

[0029] More preferably, the left front fixing buckle, the right front fixing buckle, the left rear fixing buckle and the right rear fixing buckle are all U-shaped fixing buckles.

[0030] Preferably, the prefabricated T-beam negative bending moment tensioning construction work frame further includes a first left hinge, a first right hinge, a second left hinge, a second right hinge, a left front hinge, a left rear hinge, a right front hinge, and a right rear hinge. The right side of the bottom left movable platform and the left side of the bottom right movable platform are rotatably connected to the left side of the bottom middle fixed platform and the right side of the bottom middle fixed platform in the front-rear direction via the first left hinge and the first right hinge, respectively. The lower side of the left movable guardrail and the lower side of the right movable guardrail are connected via the second left hinge and the second right hinge, respectively. The hinge is rotatably connected to the left side of the bottom left movable platform and the right side of the bottom right movable platform in the front-back direction. The left side of the left front movable guardrail and the left side of the left rear movable guardrail are rotatably connected to the front side of the left movable guardrail and the rear side of the left movable guardrail respectively via the left front hinge and the left rear hinge. The right side of the right front movable guardrail and the right side of the right rear movable guardrail are rotatably connected to the front side of the right movable guardrail and the rear side of the right movable guardrail respectively via the right front hinge and the right rear hinge.

[0031] The main beneficial effects of this utility model are as follows:

[0032] 1. The prefabricated T-beam negative moment tensioning construction work frame of this utility model uses the left front and left rear retracting chains to pull the left front and left rear movable guardrails to the upper right, thereby pulling the left movable guardrail and the bottom left movable platform to the upper right. This causes the left movable guardrail to move towards the front and rear fixed guardrails to the upper right, and the bottom left movable platform to rotate to the upper right and tilt. Then, the right front and right rear movable guardrails are pulled to the upper left by the right front and right rear retracting chains, thereby pulling the right movable guardrail and the bottom right movable platform to the upper left. This causes the right movable guardrail to move towards the front and rear fixed guardrails to the upper left, and the bottom right movable platform to rotate to the upper left and tilt, achieving folding. This allows the prefabricated T-beam wet joint to be lowered, and it can be unfolded after lowering. Therefore, it can eliminate safety risks, prevent safety accidents, and ensure the normal and safe conduct of the prefabricated T-beam negative moment tensioning construction operation, making it suitable for large-scale promotion and application.

[0033] 2. The prefabricated T-beam negative bending moment tensioning construction work frame of this utility model uses the left front and left rear retracting chains to pull the left front and left rear movable guardrails to the upper right, thereby pulling the left side movable guardrail and the bottom left side movable platform to the upper right. This causes the left side movable guardrail to move towards the front and rear fixed guardrails to the upper right, and the bottom left side movable platform to rotate to the upper right and tilt. The right front and right rear movable guardrails are then pulled to the upper left by the right front and right rear retracting chains, thereby pulling the right side movable guardrail and the bottom right side movable platform to the upper left. This causes the right side movable guardrail to move towards the front and rear fixed guardrails to the upper left, and the bottom right side movable platform to rotate to the upper left and tilt, achieving folding. This allows the prefabricated T-beam wet joint to be lowered. After lowering, it can be unfolded. Therefore, its design is ingenious, its structure is simple, its manufacturing is convenient, and its manufacturing cost is low, making it suitable for large-scale promotion and application.

[0034] These and other objects, features and advantages of this utility model will be fully apparent from the following detailed description and drawings, and can be achieved by the means, devices and combinations thereof specifically pointed out in the description of the utility model. Attached Figure Description

[0035] Figure 1 This is a three-dimensional schematic diagram of a specific embodiment of the prefabricated T-beam negative bending moment tensioning construction work frame of this utility model when unfolded.

[0036] Figure 2 yes Figure 1 The diagram shown is a front view of the specific embodiment when unfolded.

[0037] Figure 3 yes Figure 1 The diagram shown is a left-side view of the specific embodiment when unfolded.

[0038] Figure 4 yes Figure 1 The diagram shown is a bottom view of the unfolded specific embodiment.

[0039] Figure 5 yes Figure 1 The specific embodiment shown is a perspective view of the folded state, where the left front retractable chain, right front retractable chain, left rear retractable chain, right rear retractable chain, left front fixing buckle, right front fixing buckle, left rear fixing buckle, and right rear fixing buckle are not shown.

[0040] (Explanation of reference numerals in the attached diagram)

[0041] 1. Front boom; 2. Rear boom;

[0042] 3. Front fixed guardrail; 31. Left front vertical bar; 32. Right front vertical bar; 33. Front connecting bar;

[0043] 4. Rear fixed guardrail; 41. Left rear vertical bar; 42. Right rear vertical bar; 43. Rear connecting bar;

[0044] 5. Bottom center fixed platform; 51. Left bottom rod; 52. Right bottom rod; 53. Bottom center connecting rod;

[0045] 6. Bottom left movable platform; 61. First left bottom rod; 62. Second left bottom rod; 63. Third left bottom rod; 64. Fourth left bottom rod; 65. Bottom left connecting rod;

[0046] 7. Left side movable guardrail; 71. Left side front vertical bar; 72. Left side rear vertical bar; 73. Left upper vertical bar; 74. Left lower vertical bar; 75. Left side connecting bar;

[0047] 8. Left front movable guardrail; 81. First left front vertical bar; 82. Second left front vertical bar; 83. Left front connecting bar;

[0048] 9. Rear left movable guardrail; 91. First rear left vertical bar; 92. Second rear left vertical bar; 93. Rear left connecting bar;

[0049] 10 Bottom right movable platform; 101 First right bottom rod; 102 Second right bottom rod; 103 Third right bottom rod; 104 Fourth right bottom rod; 105 Bottom right connecting rod;

[0050] 11 Right-side movable guardrail; 111 Right-side front vertical bar; 112 Right-side rear vertical bar; 113 Right upper vertical bar; 114 Right lower vertical bar; 115 Right-side connecting bar;

[0051] 12 Right front movable guardrail; 121 First right front vertical bar; 122 Second right front vertical bar; 123 Right front connecting bar;

[0052] 13 Right rear movable guardrail; 131 First right rear vertical bar; 132 Second right rear vertical bar; 133 Right rear connecting bar;

[0053] 14. Front left retractable chain; 15. Front right retractable chain; 16. Rear left retractable chain; 17. Rear right retractable chain; 18. Front left retaining buckle; 19. Front right retaining buckle; 20. Rear left retaining buckle; 21. Rear right retaining buckle; 22. First left hinge; 23. First right hinge; 24. Second left hinge; 25. Second right hinge; 26. Front left hinge; 27. Rear left hinge; 28. Front right hinge; 29. ​​Rear right hinge. Detailed Implementation

[0054] In order to better understand the technical content of this utility model, the following embodiments are provided for detailed description.

[0055] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0056] Please see Figures 1-4 As shown, in a specific embodiment of this utility model, the prefabricated T-beam negative bending moment tensioning construction work frame of this utility model includes a front suspension rod 1, a rear suspension rod 2, a front fixed guardrail 3, a rear fixed guardrail 4, a bottom middle fixed platform 5, a bottom left movable platform 6, a left movable guardrail 7, a left front movable guardrail 8, a left rear movable guardrail 9, a bottom right movable platform 10, a right movable guardrail 11, a right front movable guardrail 12, a right rear movable guardrail 13, a left front take-up chain 14, a right front take-up chain 15, a left rear take-up chain 16, and a right rear take-up chain 17, wherein:

[0057] The bottom middle fixed platform 5 is horizontally arranged along the front-to-back direction. The front fixed guardrail 3 and the rear fixed guardrail 4 are both vertically arranged along the left-to-right direction and are spaced apart from each other. The lower ends of the front fixed guardrail 3 and the rear fixed guardrail 4 are respectively fixedly connected to the front end and the rear end of the bottom middle fixed platform 5. The front hanger 1 and the rear hanger 2 are both arranged along the left-to-right direction and are spaced apart from each other. The middle part of the front hanger 1 and the middle part of the rear hanger 2 are respectively fixed to the upper end of the front fixed guardrail 3 and the upper end of the rear fixed guardrail 4.

[0058] The bottom left movable platform 6 and the bottom right movable platform 10 are both horizontally arranged and along the front-back direction, and are spaced apart from each other. The bottom left movable platform 6 and the bottom right movable platform 10 are located to the left and right of the bottom middle fixed platform 5, respectively. The right side of the bottom left movable platform 6 and the left side of the bottom right movable platform 10 are rotatably connected to the left and right sides of the bottom middle fixed platform 5 around the front-back direction. The left movable guardrail 7 and the right movable guardrail 11 are both vertically arranged and along the front-back direction, and are spaced apart from each other. The lower side of the left movable guardrail 7 and the lower side of the right movable guardrail 11 are rotatably connected to the left side of the bottom left movable platform 6 and the right side of the bottom right movable platform 10 around the front-back direction, respectively. The left front movable guardrail 8 and the left rear movable guardrail 9 are both vertically arranged and along the front-back direction. The left and right movable guardrails are arranged in a left-right direction and spaced apart front and back. The left side of the left front movable guardrail 8 and the left side of the left rear movable guardrail 9 are horizontally rotatably connected to the front and rear sides of the left movable guardrail 7, respectively. The right side of the left front movable guardrail 8 and the right side of the left rear movable guardrail 9 are detachably connected to the lower left side of the front fixed guardrail 3 and the lower left side of the rear fixed guardrail 4, respectively. The right front movable guardrail 12 and the right rear movable guardrail 13 are both vertically arranged along the left-right direction and spaced apart front and back. The right side of the right front movable guardrail 12 and the right rear movable guardrail 13 are horizontally rotatably connected to the front and rear sides of the right movable guardrail 11, respectively. The left side of the right front movable guardrail 12 and the left side of the right rear movable guardrail 13 are detachably connected to the lower right side of the front fixed guardrail 3 and the lower right side of the rear fixed guardrail 4, respectively.

[0059] Both the left front retractable chain 14 and the right front retractable chain 15 are inclined along the left-right direction and arranged in a V-shape relative to each other along the left-right direction. The left end of the left front retractable chain 14 is fixed to the top left side of the left front movable guardrail 8, and the right end of the left front retractable chain 14 is detachably connected to the left end of the front boom 1. The right end of the right front retractable chain 15 is fixed to the top right side of the right front movable guardrail 12, and the left end of the right front retractable chain 15 is detachably connected to the right end of the front boom 1. The left rear retractable chain 16 and the right rear retractable chain 17 are both inclined along the left and right directions and are arranged in a figure-eight shape with each other along the left and right directions. The left end of the left rear retractable chain 16 is fixed to the top left side of the left rear movable guardrail 9, and the right end of the left rear retractable chain 16 is detachably connected to the left end of the rear boom 2. The right end of the right rear retractable chain 17 is fixed to the top right side of the right rear movable guardrail 13, and the left end of the right rear retractable chain 17 is detachably connected to the right end of the rear boom 2.

[0060] The front fixed guardrail 3 and the rear fixed guardrail 4 can have any suitable configuration; please refer to [link / reference]. Figures 1-4 As shown, in a specific embodiment of this utility model, the front fixed guardrail 3 includes a left front vertical bar 31, a right front vertical bar 32 and a front connecting bar 33. The left front vertical bar 31 and the right front vertical bar 32 are spaced apart from each other. The front connecting bar 33 is arranged along the left-right direction and is located between the left front vertical bar 31 and the right front vertical bar 32 and connects the left front vertical bar 31 and the right front vertical bar 32 respectively.

[0061] The rear fixed guardrail 4 includes a left rear vertical bar 41, a right rear vertical bar 42 and a rear connecting bar 43. The left rear vertical bar 41 and the right rear vertical bar 42 are spaced apart from each other. The rear connecting bar 43 is arranged along the left-right direction and is located between the left rear vertical bar 41 and the right rear vertical bar 42 and connects the left rear vertical bar 41 and the right rear vertical bar 42 respectively.

[0062] The lower ends of the left front vertical bar 31 and the right front vertical bar 32 are both fixedly connected to the front end of the bottom middle fixed platform 5. The lower ends of the left rear vertical bar 41 and the right rear vertical bar 42 are both fixedly connected to the rear end of the bottom middle fixed platform 5. The middle part of the front hanging bar 1 is fixed to the upper ends of the left front vertical bar 31 and the right front vertical bar 32, respectively. The middle part of the rear hanging bar 2 is fixed to the upper ends of the left rear vertical bar 41 and the right rear vertical bar 42, respectively. The right side of the left front movable guardrail 8 and the right side of the left rear movable guardrail 9 are detachably connected to the lower parts of the left front vertical bar 31 and the left rear vertical bar 41, respectively. The left side of the right front movable guardrail 12 and the left side of the right rear movable guardrail 13 are detachably connected to the lower parts of the right front vertical bar 32 and the right rear vertical bar 42, respectively.

[0063] With the above configuration, the front connecting rod 33 can connect the left front vertical rod 31 and the right front vertical rod 32 together, improving structural stability, and can also be used as a ladder step for personnel to go up and down, facilitating workers to go up and down the platform for construction work; the rear connecting rod 43 can connect the left rear vertical rod 41 and the right rear vertical rod 42 together, improving structural stability, and can also be used as a ladder step for personnel to go up and down, facilitating workers to go up and down the platform for construction work.

[0064] The number of the front connecting rods 33 and the number of the rear connecting rods 43 can be determined as needed. More preferably, there are multiple front connecting rods 33 and multiple rear connecting rods 43, all of which are vertically spaced apart. The term "multiple" refers to two or more rods. Please refer to [link to relevant documentation]. Figures 1-2 As shown, in a specific embodiment of this utility model, the number of the front connecting rod 33 and the number of the rear connecting rod 43 are both 3.

[0065] The bottom intermediate fixing platform 5 can have any suitable configuration; please refer to [link / reference]. Figure 1 and Figures 3-4 As shown, in a specific embodiment of this utility model, the bottom middle fixed platform 5 includes a left bottom rod 51, a right bottom rod 52 and a bottom middle connecting rod 53. The left bottom rod 51 and the right bottom rod 52 are both arranged along the front-back direction and are spaced apart from each other on the left and right sides. The bottom middle connecting rod 53 is arranged along the left-right direction and is located between the left bottom rod 51 and the right bottom rod 52 and connects the left bottom rod 51 and the right bottom rod 52 respectively.

[0066] The lower end of the front fixed guardrail 3 is fixedly connected to the front end of the left bottom bar 51 and the front end of the right bottom bar 52, respectively. The lower end of the rear fixed guardrail 4 is fixedly connected to the rear end of the left bottom bar 51 and the rear end of the right bottom bar 52, respectively. The bottom left movable platform 6 and the bottom right movable platform 10 are located to the left of the left bottom bar 51 and to the right of the right bottom bar 52, respectively. The right side of the bottom left movable platform 6 and the left side of the bottom right movable platform 10 are rotatably connected to the left bottom bar 51 and the right bottom bar 52 around the front-back direction, respectively. In the case that the front fixed guardrail 3 includes a left front vertical bar 31, a right front vertical bar 32, and a front connecting bar 33, and the rear fixed guardrail 4 includes a left rear vertical bar 41, a right rear vertical bar 42, and a rear connecting bar 43, the lower ends of the left front vertical bar 31 and the right front vertical bar 32 are respectively fixedly connected to the front ends of the left bottom bar 51 and the right bottom bar 52, respectively, and the lower ends of the left rear vertical bar 41 and the right rear vertical bar 42 are respectively fixedly connected to the rear ends of the left bottom bar 51 and the right bottom bar 52.

[0067] The number of the bottom intermediate connecting rods 53 can be determined as needed. More preferably, there are multiple bottom intermediate connecting rods 53, which are spaced apart from each other. Please refer to [link to relevant documentation]. Figure 1 and Figure 4 As shown, in a specific embodiment of this utility model, the number of bottom middle connecting rods 53 is 2.

[0068] The bottom left movable platform 6 and the bottom right movable platform 10 can have any suitable configuration; please refer to [link / reference]. Figures 1-4As shown, in a specific embodiment of this utility model, the bottom left movable platform 6 includes a first left bottom rod 61, a second left bottom rod 62, a third left bottom rod 63, a fourth left bottom rod 64, and a bottom left connecting rod 65. The first left bottom rod 61 and the second left bottom rod 62 are both arranged along the front-back direction and are spaced apart from each other on the left and right. The third left bottom rod 63 and the fourth left bottom rod 64 are both arranged along the left-right direction and are spaced apart from each other on the front and back. The first left bottom rod 61 and the second left bottom rod 62 are both located between the third left bottom rod 63 and the fourth left bottom rod 64 and are both connected to the third left bottom rod 63 and the fourth left bottom rod 64 respectively. The bottom left connecting rod 65 is arranged along the front-back direction and is located between the first left bottom rod 61 and the second left bottom rod 62 and between the third left bottom rod 63 and the fourth left bottom rod 64 and is connected to the third left bottom rod 63 and the fourth left bottom rod 64 respectively.

[0069] The bottom right movable platform 10 includes a first right bottom rod 101, a second right bottom rod 102, a third right bottom rod 103, a fourth right bottom rod 104, and a bottom right connecting rod 105. The second right bottom rod 102 and the first right bottom rod 101 are both arranged along the front-back direction and spaced apart from each other on the left and right. The third right bottom rod 103 and the fourth right bottom rod 104 are both arranged along the left-right direction and spaced apart from each other on the front and back. The first right bottom rod 101 and the second right bottom rod 102 are both located between the third right bottom rod 103 and the fourth right bottom rod 104 and are both connected to the third right bottom rod 103 and the fourth right bottom rod 104 respectively. The bottom right connecting rod 105 is arranged along the front-back direction and is located between the first right bottom rod 101 and the second right bottom rod 102 and between the third right bottom rod 103 and the fourth right bottom rod 104 and is connected to the third right bottom rod 103 and the fourth right bottom rod 104 respectively.

[0070] The second left bottom rod 62 and the second right bottom rod 102 are located on the left and right sides of the bottom middle fixed platform 5, respectively, and are rotatably connected to the left side of the bottom middle fixed platform 5 and the left side of the bottom middle fixed platform 5, respectively, around the front-back direction. The lower side of the left movable guardrail 7 and the lower side of the right movable guardrail 11 are rotatably connected to the first left bottom rod 61 and the first right bottom rod 101, respectively, around the front-back direction. When the bottom middle fixed platform 5 includes a left bottom rod 51, a right bottom rod 52, and a bottom middle connecting rod 53, the second left bottom rod 62 and the second right bottom rod 102 are located on the left side of the left bottom rod 51 and the right side of the right bottom rod 52, respectively, and are rotatably connected to the left bottom rod 51 and the right bottom rod 52, respectively, around the front-back direction.

[0071] The number of bottom left connecting rods 65 and the number of bottom right connecting rods 105 can be determined as needed. More preferably, there are multiple bottom left connecting rods 65 and multiple bottom right connecting rods 105, and these multiple bottom left connecting rods 65 and multiple bottom right connecting rods 105 are arranged alternately on the left and right sides. Please refer to [link / reference]. Figure 1 and Figure 4 As shown, in a specific embodiment of this utility model, the number of bottom left connecting rods 65 and the number of bottom right connecting rods 105 are both 2.

[0072] The left movable guardrail 7 and the right movable guardrail 11 can have any suitable configuration; please refer to [link / reference]. Figures 1-3 As shown, in a specific embodiment of this utility model, the left movable guardrail 7 includes a left front vertical bar 71, a left rear vertical bar 72, a left upper vertical bar 73, a left lower vertical bar 74, and a left connecting bar 75. The left front vertical bar 71 and the left rear vertical bar 72 are spaced apart from each other. The left upper vertical bar 73 and the left lower vertical bar 74 are vertically spaced apart and are both located between the left front vertical bar 71 and the left rear vertical bar 72, and are both connected to the left front vertical bar 71 and the left rear vertical bar 72 respectively. The left connecting bar 75 is arranged along the front-back direction and is located between the left upper vertical bar 73 and the left lower vertical bar 74, and between the left front vertical bar 71 and the left rear vertical bar 72, and is connected to the left front vertical bar 71 and the left rear vertical bar 72 respectively.

[0073] The right-side movable guardrail 11 includes a right front vertical bar 111, a right rear vertical bar 112, a right upper vertical bar 113, a right lower vertical bar 114, and a right connecting bar 115. The right front vertical bar 111 and the right rear vertical bar 112 are spaced apart from each other. The right upper vertical bar 113 and the right lower vertical bar 114 are vertically spaced apart and are both located between the right front vertical bar 111 and the right rear vertical bar 112, and are both connected to the right front vertical bar 111 and the right rear vertical bar 112 respectively. The right connecting bar 115 is arranged along the front-back direction and is located between the right upper vertical bar 113 and the right lower vertical bar 114, and between the right front vertical bar 111 and the right rear vertical bar 112, and is connected to the right front vertical bar 111 and the right rear vertical bar 112 respectively.

[0074] The lower left vertical bar 74 and the lower right vertical bar 114 are rotatably connected to the left side of the bottom left movable platform 6 and the right side of the bottom right movable platform 10, respectively, around the front-left movable guardrail 8 and the left side of the left rear movable guardrail 9, respectively, are horizontally rotatably connected to the left front vertical bar 71 and the left rear vertical bar 72, respectively. The right side of the right front movable guardrail 12 and the right rear movable guardrail 13 are horizontally rotatably connected to the right front vertical bar 111 and the right rear vertical bar 112, respectively. When the bottom left movable platform 6 includes a first left bottom rod 61, a second left bottom rod 62, a third left bottom rod 63, a fourth left bottom rod 64 and a bottom left connecting rod 65, and the bottom right movable platform 10 includes a first right bottom rod 101, a second right bottom rod 102, a third right bottom rod 103, a fourth right bottom rod 104 and a bottom right connecting rod 105, the lower left vertical rod 74 and the lower right vertical rod 114 are rotatably connected to the first left bottom rod 61 and the first right bottom rod 101 respectively around the front-back direction.

[0075] The number of left-side connecting rods 75 and the number of right-side connecting rods 115 can be determined as needed. More preferably, there are multiple left-side connecting rods 75 and multiple right-side connecting rods 115, all of which are vertically spaced apart. Please refer to [link to relevant documentation]. Figure 1 and Figure 3 As shown, in a specific embodiment of this utility model, the number of the left connecting rod 75 and the number of the right connecting rod 115 are both 2.

[0076] The left front movable guardrail 8 and the left rear movable guardrail 9 can have any suitable configuration; please refer to [link / reference]. Figures 1-2 As shown, in a specific embodiment of this utility model, the left front movable guardrail 8 includes a first left front vertical bar 81, a second left front vertical bar 82, and a left front connecting bar 83. The first left front vertical bar 81 and the second left front vertical bar 82 are spaced apart from each other on the left and right sides. The left front connecting bar 83 is arranged along the left and right direction and is located between the first left front vertical bar 81 and the second left front vertical bar 82 and connects the first left front vertical bar 81 and the second left front vertical bar 82 respectively. There are multiple left front connecting bars 83, and the multiple left front connecting bars 83 are arranged vertically spaced apart from each other.

[0077] The left rear movable guardrail 9 includes a first left rear vertical bar 91, a second left rear vertical bar 92, and a left rear connecting bar 93. The first left rear vertical bar 91 and the second left rear vertical bar 92 are spaced apart from each other. The left rear connecting bar 93 is arranged along the left-right direction and is located between the first left rear vertical bar 91 and the second left rear vertical bar 92, and connects the first left rear vertical bar 91 and the second left rear vertical bar 92 respectively. There are multiple left rear connecting bars 93, which are arranged vertically spaced apart from each other.

[0078] The first left front vertical bar 81 and the first left rear vertical bar 91 are horizontally rotatably connected to the front side of the left movable guardrail 7 and the rear side of the left movable guardrail 7, respectively. The second left front vertical bar 82 and the second left rear vertical bar 92 are detachably connected to the lower left side of the front fixed guardrail 3 and the lower left side of the rear fixed guardrail 4, respectively. The left end of the left front retractable chain 14 is fixed to the left end of the uppermost left front connecting rod 83, and the left end of the left rear retractable chain 16 is fixed to the left end of the uppermost left rear connecting rod 93. When the left movable guardrail 7 includes a left front vertical bar 71, a left rear vertical bar 72, a left upper vertical bar 73, a left lower vertical bar 74, and a left connecting bar 75, the first left front vertical bar 81 and the first left rear vertical bar 91 are horizontally rotatably connected to the left front vertical bar 71 and the left rear vertical bar 72, respectively; when the front fixed guardrail 3 includes a left front vertical bar 31, a right front vertical bar 32, and a front connecting bar 33, and the rear fixed guardrail 4 includes a left rear vertical bar 41, a right rear vertical bar 42, and a rear connecting bar 43, the second left front vertical bar 82 and the second left rear vertical bar 92 are detachably connected to the lower part of the left front vertical bar 31 and the lower part of the left rear vertical bar 41, respectively.

[0079] The number of the left front link 83 and the number of the left rear link 93 can be determined as needed. Please refer to [link / reference]. Figures 1-2 As shown, in a specific embodiment of this utility model, the number of the left front connecting rod 83 and the number of the left rear connecting rod 93 are both 4.

[0080] The right front movable guardrail 12 and the right rear movable guardrail 13 can have any suitable configuration; please refer to [link / reference]. Figures 1-2As shown, in a specific embodiment of this utility model, the right front movable guardrail 12 includes a first right front vertical bar 121, a second right front vertical bar 122, and a right front connecting bar 123. The second right front vertical bar 122 and the first right front vertical bar 121 are arranged alternately on the left and right sides. The right front connecting bar 123 is arranged along the left and right direction and is located between the first right front vertical bar 121 and the second right front vertical bar 122 and connects the first right front vertical bar 121 and the second right front vertical bar 122 respectively. There are multiple right front connecting bars 123, and the multiple right front connecting bars 123 are arranged vertically alternately.

[0081] The right rear movable guardrail 13 includes a first right rear vertical bar 131, a second right rear vertical bar 132, and a right rear connecting bar 133. The second right rear vertical bar 132 and the first right rear vertical bar 131 are spaced apart from each other on the left and right sides. The right rear connecting bar 133 is arranged along the left and right direction and is located between the first right rear vertical bar 131 and the second right rear vertical bar 132 and connects the first right rear vertical bar 131 and the second right rear vertical bar 132 respectively. There are multiple right rear connecting bars 133, and the multiple right rear connecting bars 133 are arranged vertically spaced apart from each other.

[0082] The first right front vertical bar 121 and the first right rear vertical bar 131 are horizontally rotatably connected to the front side and the rear side of the right movable guardrail 11, respectively. The second right front vertical bar 122 and the second right rear vertical bar 132 are detachably connected to the lower right side of the front fixed guardrail 3 and the lower right side of the rear fixed guardrail 4, respectively. The right end of the right front retractable chain 15 is fixed to the right end of the uppermost right front connecting rod 123, and the right end of the right rear retractable chain 17 is fixed to the right end of the uppermost right rear connecting rod 133. When the right movable guardrail 11 includes a right front vertical bar 111, a right rear vertical bar 112, a right upper vertical bar 113, a right lower vertical bar 114, and a right connecting bar 115, the first right front vertical bar 121 and the first right rear vertical bar 131 are horizontally rotatably connected to the right front vertical bar 111 and the right rear vertical bar 112, respectively. When the front fixed guardrail 3 includes a left front vertical bar 31, a right front vertical bar 32, and a front connecting bar 33, and the rear fixed guardrail 4 includes a left rear vertical bar 41, a right rear vertical bar 42, and a rear connecting bar 43, the second right front vertical bar 122 and the second right rear vertical bar 132 are detachably connected to the lower part of the right front vertical bar 32 and the lower part of the right rear vertical bar 42, respectively.

[0083] The number of the right front link 123 and the number of the right rear link 133 can be determined as needed. Please refer to [link / reference]. Figures 1-2 As shown, in a specific embodiment of this utility model, the number of right front connecting rods 123 and the number of right rear connecting rods 133 are both 4.

[0084] The right end of the left front take-up chain 14 is detachably connected to the left end of the front boom 1; the left end of the right front take-up chain 15 is detachably connected to the right end of the front boom 1; the right end of the left rear take-up chain 16 is detachably connected to the left end of the rear boom 2; and the left end of the right rear take-up chain 17 is detachably connected to the right end of the rear boom 2. Any suitable structure can be used. Please refer to [link / reference]. Figures 1-3 As shown, in a specific embodiment of this utility model, the prefabricated T-beam negative bending moment tensioning construction frame further includes a left front fixing buckle 18, a right front fixing buckle 19, a left rear fixing buckle 20, and a right rear fixing buckle 21. The left front fixing buckle 18, the right front fixing buckle 19, the left rear fixing buckle 20, and the right rear fixing buckle 21 are respectively disposed on the left end of the front suspension rod 1, the right end of the front suspension rod 1, the left end of the rear suspension rod 2, and the right end of the rear suspension rod 2. The right end of the left front take-up chain 14, the left end of the right front take-up chain 15, the right end of the left rear take-up chain 16, and the left end of the right rear take-up chain 17 are detachably connected to the left front fixing buckle 18, the right front fixing buckle 19, the left rear fixing buckle 20, and the right rear fixing buckle 21, respectively.

[0085] The left front fixing buckle 18, the right front fixing buckle 19, the left rear fixing buckle 20, and the right rear fixing buckle 21 can be any suitable fixing buckle. In a specific embodiment of this utility model, the left front fixing buckle 18, the right front fixing buckle 19, the left rear fixing buckle 20, and the right rear fixing buckle 21 are all U-shaped fixing buckles.

[0086] The right side of the bottom left movable platform 6 and the left side of the bottom right movable platform 10 are rotatably connected to the left and right sides of the bottom middle fixed platform 5, respectively, around the front-back direction. The lower side of the left movable guardrail 7 and the lower side of the right movable guardrail 11 are rotatably connected to the left side of the bottom left movable platform 6 and the right side of the bottom right movable platform 10, respectively, around the front-back direction. The left side of the left front movable guardrail 8 and the left side of the left rear movable guardrail 9 are horizontally rotatably connected to the front and rear sides of the left movable guardrail 7, respectively. The right side of the right front movable guardrail 12 and the right rear movable guardrail 13 are horizontally rotatably connected to the front and rear sides of the right movable guardrail 11, respectively. Any suitable structure can be adopted. Please refer to [link / reference]. Figures 1-4As shown, in a specific embodiment of this utility model, the prefabricated T-beam negative bending moment tensioning construction work frame further includes a first left hinge 22, a first right hinge 23, a second left hinge 24, a second right hinge 25, a left front hinge 26, a left rear hinge 27, a right front hinge 28, and a right rear hinge 29. The right side of the bottom left movable platform 6 and the left side of the bottom right movable platform 10 are respectively rotatably connected to the left side of the bottom middle fixed platform 5 and the right side of the bottom middle fixed platform 5 around the front-rear direction via the first left hinge 22 and the first right hinge 23. The lower side of the left movable guardrail 7 and the lower side of the right movable guardrail 11 are respectively connected via the second left hinge 26, the first right hinge 27, the first right hinge 28, and the first right hinge 29. Hinges 24 and 25 are rotatably connected to the left side of the bottom left movable platform 6 and the right side of the bottom right movable platform 10 in the front-back direction. The left side of the left front movable guardrail 8 and the left side of the left rear movable guardrail 9 are rotatably connected to the front and rear sides of the left movable guardrail 7 via the left front hinge 26 and the left rear hinge 27, respectively. The right side of the right front movable guardrail 12 and the right rear movable guardrail 13 are rotatably connected to the front and rear sides of the right movable guardrail 11 via the right front hinge 28 and the right rear hinge 29, respectively.

[0087] The number of the first left hinge 22, the first right hinge 23, the second left hinge 24, the second right hinge 25, the left front hinge 26, the left rear hinge 27, the right front hinge 28, and the right rear hinge 29 can be determined as needed. More preferably, there are multiple first left hinges 22, first right hinges 23, second left hinges 24, and second right hinges 25, with each of these multiple first left hinges 22, first right hinges 23, second left hinges 24, and second right hinges 25 spaced apart. Similarly, there are multiple left front hinges 26, left rear hinges 27, right front hinges 28, and right rear hinges 29, with each of these multiple left front hinges 26, left rear hinges 27, right front hinges 28, and right rear hinges 29 spaced apart vertically. (See also...) Figures 1-4 As shown, in a specific embodiment of this utility model, the number of the first left hinge 22, the number of the first right hinge 23, the number of the second left hinge 24, and the number of the second right hinge 25 are all 2; the number of the left front hinge 26, the number of the left rear hinge 27, the number of the right front hinge 28, and the number of the right rear hinge 29 are all 2.

[0088] The right side of the left front movable guardrail 8 and the right side of the left rear movable guardrail 9 are respectively detachably connected to the lower left side of the front fixed guardrail 3 and the lower left side of the rear fixed guardrail 4. The left side of the right front movable guardrail 12 and the left side of the right rear movable guardrail 13 are respectively detachably connected to the lower right side of the front fixed guardrail 3 and the lower right side of the rear fixed guardrail 4. Any suitable structure can be adopted, such as locking with a lock, inserting with a pin hole, engaging with a card slot, or binding with steel wire.

[0089] In use, taking the wet joint position of the prefabricated T-beam along the front-to-back direction as an example, since the wet joint position of the prefabricated T-beam is relatively narrow, firstly, disassemble the right side of the left front movable guardrail 8 and the lower left side of the front fixed guardrail 3, as well as the right side of the left rear movable guardrail 9 and the lower left side of the rear fixed guardrail 4. Rotate the left front movable guardrail 8 to the left rearward, and rotate the left rear movable guardrail 9 to the left frontward. Then, disassemble the right end of the left front retractable chain 14 and the left end of the front boom 1, as well as the right end of the left rear retractable chain 16 and... The left end of the rear boom 2 is disassembled. The left front movable guardrail 8 and left rear movable guardrail 9 are pulled upwards and to the right via the left front retractable chain 14 and left rear retractable chain 16. This, in turn, pulls the left movable guardrail 7 and the bottom left movable platform 6 upwards and to the right, causing the left movable guardrail 7 to move upwards and to the right towards the front fixed guardrail 3 and rear fixed guardrail 4. The bottom left movable platform 6 rotates upwards and to the right into an inclined position. This causes the right end of the left front retractable chain 14, the left end of the front boom 1, and the right end of the left rear retractable chain 16 to... The left end of the rear boom 2 is reconnected and fixed; similarly, the left side of the right front movable guardrail 12 and the lower right side of the front fixed guardrail 3, as well as the left side of the right rear movable guardrail 13 and the lower right side of the rear fixed guardrail 4 are disassembled. The right front movable guardrail 12 is rotated to the right rear, and the right rear movable guardrail 13 is rotated to the right front. The left end of the right front take-up chain 15 and the right end of the front boom 1, as well as the left end of the right rear take-up chain 17 and the right end of the rear boom 2, are disassembled. The right rear retractable chain 17 pulls the right front movable guardrail 12 and the right rear movable guardrail 13 to the upper left, thereby pulling the right side movable guardrail 11 and the bottom right movable platform 10 to the upper left. This causes the right side movable guardrail 11 to move towards the front fixed guardrail 3 and the rear fixed guardrail 4, and the bottom right movable platform 10 to rotate to the upper left and tilt. This reconnects and secures the left end of the right front retractable chain 15 to the right end of the front boom 1, as well as the left end of the right rear retractable chain 17 to the right end of the rear boom 2. Figure 5 As shown, the width of the entire work frame is compressed to allow for lowering from the wet joint position.

[0090] After lowering into place, the left and right ends of the front boom 1 and the left and right ends of the rear boom 2 are all hung on the top surface of the prefabricated T-beam. Then, the right end of the left front retractable chain 14 and the left end of the front boom 1, the right end of the left rear retractable chain 16 and the left end of the rear boom 2, the left end of the right front retractable chain 15 and the right end of the front boom 1, and the left end of the right rear retractable chain 17 and the right end of the rear boom 2 are disassembled. The guardrails and movable platforms on both sides are slowly lowered until the bottom left movable platform 6 and the bottom right movable platform 10 are in a horizontal position. The right end of the left front retractable chain 14 and the left end of the front boom 1, the right end of the left rear retractable chain 16 and the left end of the rear boom 2, the left end of the right front retractable chain 15 and the right end of the front boom 1, and the left end of the right rear retractable chain 17 are then disassembled. The right end of the first and second suspension rods 2 are reconnected and fixed. Construction workers descend to the bottom middle fixed platform 5 via the front fixed guardrail 3 or the rear fixed guardrail 4 (or via another ladder). Then, the left front movable guardrail 8 and the left rear movable guardrail 9 are unfolded. The right side of the left front movable guardrail 8 and the lower left side of the front fixed guardrail 3, as well as the right side of the left rear movable guardrail 9 and the lower left side of the rear fixed guardrail 4, are reconnected and fixed. The right front movable guardrail 12 and the right rear movable guardrail 13 are unfolded. The left side of the right front movable guardrail 12 and the lower right side of the front fixed guardrail 3, as well as the left side of the right rear movable guardrail 13 and the lower right side of the rear fixed guardrail 4, are reconnected and fixed. Figures 1-4 As shown, workers can carry out construction operations such as threading steel strands, installing jacks, tensioning, and grouting inside the tensioning construction frame, with complete protection on all sides.

[0091] After construction is completed, disassemble the right side of the left front movable guardrail 8 and the lower left side of the front fixed guardrail 3, as well as the right side of the left rear movable guardrail 9 and the lower left side of the rear fixed guardrail 4. Rotate the left front movable guardrail 8 to the left rear and the left rear movable guardrail 9 to the left front. Disassemble the left side of the right front movable guardrail 12 and the lower right side of the front fixed guardrail 3, as well as the left side of the right rear movable guardrail 13 and the lower right side of the rear fixed guardrail 4. Rotate the right front movable guardrail 12 to the right rear and the right rear movable guardrail 13 to the right front. Workers can then access the top surface of the prefabricated T-beam via the front fixed guardrail 3 or the rear fixed guardrail 4 (or via a separate ladder). The right end of the front take-up chain 14 and the left end of the front boom 1, the right end of the left rear take-up chain 16 and the left end of the rear boom 2, the left end of the right front take-up chain 15 and the right end of the front boom 1, and the left end of the right rear take-up chain 17 and the right end of the rear boom 2 are disassembled. The side railings and the bottom movable platform are pulled upwards and towards the center using the left front take-up chain 14, left rear take-up chain 16, right front take-up chain 15, and right rear take-up chain 17, compressing them so that their width is smaller than the width of the wet joint hole. Then, the right ends of the left front take-up chain 14 and the left ends of the front boom 1, the left rear take-up chain 16 and the left ends of the rear boom 2, the right front take-up chain 15 and the right ends of the front boom 1, and the right rear take-up chain 17 and the right ends of the rear boom 2 are reconnected and fixed. Figure 5 As shown, the entire work frame is then lifted to complete the entire construction process.

[0092] Compared with the prior art, the present invention has the following advantages:

[0093] 1. The bottom platform of this utility model is divided into a fixed platform in the middle of the bottom and two movable platforms on both sides, namely the movable platform on the left side of the bottom and the movable platform on the right side of the bottom. The movable platforms on both sides can be flipped and folded upwards. After passing through the narrow space of the wet joint hole, they can be flipped and extended again to ensure sufficient construction safety space for negative bending moment tensioning construction, and the safety protection on all sides is in place.

[0094] 2. This utility model uses a retractable chain to connect the working platform with the main load-bearing crossbars, namely the front and rear suspension rods. On the one hand, this ensures the safety and stability of the working platform. On the other hand, the extension and compression of the entire working frame can be operated from the top of the prefabricated T-beam through the retractable chain, ensuring the safety of the construction operation.

[0095] 3. This utility model can be equipped with double vertical bars for both the front and rear fixed guardrails, and a connecting rod can be installed between the vertical bars. On the one hand, the connecting rod can enhance the stability of the entire structure, and on the other hand, the connecting rod can be used as a ladder for construction workers to climb up and down, ensuring the safety of construction workers going up and down.

[0096] In summary, the prefabricated T-beam negative moment tensioning construction work frame of this utility model can eliminate safety risks, prevent safety accidents, and ensure the normal and safe conduct of prefabricated T-beam negative moment tensioning construction operations. It has an ingenious design, simple structure, easy manufacturing, and low manufacturing cost, making it suitable for large-scale promotion and application.

[0097] Therefore, it is evident that the objective of this utility model has been fully and effectively achieved. The function and structural principles of this utility model have been demonstrated and explained in the embodiments. Without departing from the stated principles, any modifications can be made to the implementation methods. Therefore, this utility model includes all modified embodiments based on the spirit and scope of the claims.

Claims

1. A prefabricated T-beam negative bending moment tensioning construction work frame, characterized in that, This includes a front boom, a rear boom, a front fixed guardrail, a rear fixed guardrail, a bottom center fixed platform, a bottom left movable platform, a left movable guardrail, a left front movable guardrail, a left rear movable guardrail, a bottom right movable platform, a right movable guardrail, a right front movable guardrail, a right rear movable guardrail, a left front take-up chain, a right front take-up chain, a left rear take-up chain, and a right rear take-up chain, wherein: The bottom middle fixed platform is horizontally arranged along the front-to-back direction. The front fixed guardrail and the rear fixed guardrail are both vertically arranged along the left-to-right direction and are spaced apart from each other. The lower ends of the front fixed guardrail and the rear fixed guardrail are respectively fixedly connected to the front end and the rear end of the bottom middle fixed platform. The front hanger and the rear hanger are both arranged along the left-to-right direction and are spaced apart from each other. The middle part of the front hanger and the middle part of the rear hanger are respectively fixed to the upper end of the front fixed guardrail and the upper end of the rear fixed guardrail. The bottom left and bottom right movable platforms are both horizontally arranged and aligned along the front-back direction, spaced apart from each other. The bottom left and bottom right movable platforms are located to the left and right of the bottom middle fixed platform, respectively. The right side of the bottom left movable platform and the left side of the bottom right movable platform are rotatably connected to the left and right sides of the bottom middle fixed platform, respectively, around the front-back direction. The left and right movable guardrails are both vertically arranged and aligned along the front-back direction, spaced apart from each other. The lower sides of the left and right movable guardrails are rotatably connected to the left side of the bottom left movable platform and the right side of the bottom right movable platform, respectively, around the front-back direction. The left front and left rear movable guardrails are both vertically arranged and aligned along the front-back direction. The left and right movable guardrails are arranged in a left-right direction and spaced apart from each other. The left side of the left front movable guardrail and the left side of the left rear movable guardrail are horizontally rotatably connected to the front and rear sides of the left movable guardrail, respectively. The right side of the left front movable guardrail and the right side of the left rear movable guardrail are detachably connected to the lower left side of the front fixed guardrail and the lower left side of the rear fixed guardrail, respectively. The right front movable guardrail and the right rear movable guardrail are both arranged vertically and along the left-right direction and spaced apart from each other. The right side of the right front movable guardrail and the right side of the right rear movable guardrail are horizontally rotatably connected to the front and rear sides of the right movable guardrail, respectively. The left side of the right front movable guardrail and the left side of the right rear movable guardrail are detachably connected to the lower right side of the front fixed guardrail and the lower right side of the rear fixed guardrail, respectively. The left front retractable chain and the right front retractable chain are both inclined along the left and right directions and arranged in a V-shape relative to each other along the left and right directions. The left end of the left front retractable chain is fixed to the top left side of the left front movable guardrail, and the right end of the left front retractable chain is detachably connected to the left end of the front boom. The right end of the right front retractable chain is fixed to the top right side of the right front movable guardrail, and the left end of the right front retractable chain is detachably connected to the right end of the front boom. The left rear retractable chain and the right rear retractable chain are both inclined along the left and right directions and arranged in a V-shape relative to each other along the left and right directions. The left end of the left rear retractable chain is fixed to the top left side of the left rear movable guardrail, and the right end of the left rear retractable chain is detachably connected to the left end of the rear boom. The right end of the right rear retractable chain is fixed to the top right side of the right rear movable guardrail, and the left end of the right rear retractable chain is detachably connected to the right end of the rear boom.

2. The prefabricated T-beam negative bending moment tensioning construction work frame as described in claim 1, characterized in that, The front fixed guardrail includes a left front vertical bar, a right front vertical bar, and a front connecting bar. The left front vertical bar and the right front vertical bar are spaced apart from each other. The front connecting bar is arranged along the left-right direction and is located between the left front vertical bar and the right front vertical bar, and connects the left front vertical bar and the right front vertical bar respectively. The rear fixed guardrail includes a left rear vertical bar, a right rear vertical bar, and a rear connecting bar. The left rear vertical bar and the right rear vertical bar are spaced apart from each other. The rear connecting bar is arranged along the left-right direction and is located between the left rear vertical bar and the right rear vertical bar, and connects the left rear vertical bar and the right rear vertical bar respectively. The lower ends of the left front vertical bar and the right front vertical bar are both fixedly connected to the front end of the bottom middle fixed platform. The lower ends of the left rear vertical bar and the right rear vertical bar are both fixedly connected to the rear end of the bottom middle fixed platform. The middle part of the front hanging rod is fixed to the upper end of the left front vertical bar and the upper end of the right front vertical bar, respectively. The middle part of the rear hanging rod is fixed to the upper end of the left rear vertical bar and the upper end of the right rear vertical bar, respectively. The right side of the left front movable guardrail and the right side of the left rear movable guardrail are detachably connected to the lower part of the left front vertical bar and the lower part of the left rear vertical bar, respectively. The left side of the right front movable guardrail and the left side of the right rear movable guardrail are detachably connected to the lower part of the right front vertical bar and the lower part of the right rear vertical bar, respectively.

3. The prefabricated T-beam negative bending moment tensioning construction work frame as described in claim 1, characterized in that, The bottom middle fixed platform includes a left bottom rod, a right bottom rod, and a bottom middle connecting rod. The left bottom rod and the right bottom rod are both arranged along the front-back direction and are spaced apart from each other on the left and right sides. The bottom middle connecting rod is arranged along the left-right direction and is located between the left bottom rod and the right bottom rod, and connects the left bottom rod and the right bottom rod respectively. The lower ends of the front fixed guardrail are fixedly connected to the front ends of the left and right bottom bars, respectively. The lower ends of the rear fixed guardrail are fixedly connected to the rear ends of the left and right bottom bars, respectively. The bottom left movable platform and the bottom right movable platform are located to the left of the left bottom bar and to the right of the right bottom bar, respectively. The right side of the bottom left movable platform and the left side of the bottom right movable platform are rotatably connected to the left and right bottom bars in the front-back direction, respectively.

4. The prefabricated T-beam negative bending moment tensioning construction work frame as described in claim 1, characterized in that, The bottom left movable platform includes a first left bottom rod, a second left bottom rod, a third left bottom rod, a fourth left bottom rod, and a bottom left connecting rod. The first left bottom rod and the second left bottom rod are both arranged along the front-back direction and spaced apart from each other on the left and right. The third left bottom rod and the fourth left bottom rod are both arranged along the left-right direction and spaced apart from each other on the front and back. The first left bottom rod and the second left bottom rod are both located between the third left bottom rod and the fourth left bottom rod and are both connected to the third left bottom rod and the fourth left bottom rod, respectively. The bottom left connecting rod is arranged along the front-back direction and is located between the first left bottom rod and the second left bottom rod and between the third left bottom rod and the fourth left bottom rod, and is connected to the third left bottom rod and the fourth left bottom rod, respectively. The bottom right movable platform includes a first right bottom rod, a second right bottom rod, a third right bottom rod, a fourth right bottom rod, and a bottom right connecting rod. The second right bottom rod and the first right bottom rod are both arranged along the front-back direction and spaced apart from each other on the left and right. The third right bottom rod and the fourth right bottom rod are both arranged along the left-right direction and spaced apart from each other on the front and back. The first right bottom rod and the second right bottom rod are both located between the third right bottom rod and the fourth right bottom rod and are both connected to the third right bottom rod and the fourth right bottom rod, respectively. The bottom right connecting rod is arranged along the front-back direction and is located between the first right bottom rod and the second right bottom rod and between the third right bottom rod and the fourth right bottom rod, and is connected to the third right bottom rod and the fourth right bottom rod, respectively. The second left bottom bar and the second right bottom bar are located on the left and right sides of the bottom middle fixed platform, respectively, and are rotatably connected to the left side of the bottom middle fixed platform and the left side of the bottom middle fixed platform, respectively, around the front and back direction. The lower side of the left movable guardrail and the lower side of the right movable guardrail are rotatably connected to the first left bottom bar and the first right bottom bar, respectively, around the front and back direction.

5. The prefabricated T-beam negative bending moment tensioning construction work frame as described in claim 1, characterized in that, The left-side movable guardrail includes a left front vertical bar, a left rear vertical bar, a left upper vertical bar, a left lower vertical bar, and a left connecting bar. The left front vertical bar and the left rear vertical bar are spaced apart from each other. The left upper vertical bar and the left lower vertical bar are vertically spaced apart and are both located between the left front vertical bar and the left rear vertical bar, and are both connected to the left front vertical bar and the left rear vertical bar, respectively. The left connecting bar is arranged along the front-back direction and is located between the left upper vertical bar and the left lower vertical bar, as well as between the left front vertical bar and the left rear vertical bar, and is connected to the left front vertical bar and the left rear vertical bar, respectively. The right-side movable guardrail includes a right front vertical bar, a right rear vertical bar, a right upper vertical bar, a right lower vertical bar, and a right connecting bar. The right front vertical bar and the right rear vertical bar are spaced apart from each other. The right upper vertical bar and the right lower vertical bar are vertically spaced apart and are both located between the right front vertical bar and the right rear vertical bar, and are both connected to the right front vertical bar and the right rear vertical bar, respectively. The right connecting bar is arranged along the front-back direction and is located between the right upper vertical bar and the right lower vertical bar, as well as between the right front vertical bar and the right rear vertical bar, and is connected to the right front vertical bar and the right rear vertical bar, respectively. The lower left vertical bar and the lower right vertical bar are rotatably connected to the left side of the bottom left movable platform and the right side of the bottom right movable platform, respectively, around the front-left movable guardrail. The left side of the left front movable guardrail and the left side of the left rear movable guardrail are horizontally rotatably connected to the left front vertical bar and the left rear vertical bar, respectively. The right side of the right front movable guardrail and the right side of the right rear movable guardrail are horizontally rotatably connected to the right front vertical bar and the right rear vertical bar, respectively.

6. The prefabricated T-beam negative bending moment tensioning construction work frame as described in claim 1, characterized in that, The left front movable guardrail includes a first left front vertical bar, a second left front vertical bar, and a left front connecting bar. The first left front vertical bar and the second left front vertical bar are spaced apart from each other. The left front connecting bar is arranged along the left-right direction and is located between the first left front vertical bar and the second left front vertical bar, and connects the first left front vertical bar and the second left front vertical bar respectively. There are multiple left front connecting bars, which are arranged vertically spaced apart from each other. The left rear movable guardrail includes a first left rear vertical bar, a second left rear vertical bar, and a left rear connecting bar. The first left rear vertical bar and the second left rear vertical bar are spaced apart from each other. The left rear connecting bar is arranged along the left-right direction and is located between the first left rear vertical bar and the second left rear vertical bar, and connects the first left rear vertical bar and the second left rear vertical bar respectively. There are multiple left rear connecting bars, which are arranged vertically spaced apart from each other. The first left front vertical bar and the first left rear vertical bar are horizontally rotatably connected to the front side of the left movable guardrail and the rear side of the left movable guardrail, respectively. The second left front vertical bar and the second left rear vertical bar are detachably connected to the lower left side of the front fixed guardrail and the lower left side of the rear fixed guardrail, respectively. The left end of the left front retractable chain is fixed to the left end of the uppermost left front connecting rod, and the left end of the left rear retractable chain is fixed to the left end of the uppermost left rear connecting rod.

7. The prefabricated T-beam negative bending moment tensioning construction work frame as described in claim 1, characterized in that, The right front movable guardrail includes a first right front vertical bar, a second right front vertical bar, and a right front connecting bar. The second right front vertical bar and the first right front vertical bar are spaced apart from each other on the left and right sides. The right front connecting bar is arranged along the left and right direction and is located between the first right front vertical bar and the second right front vertical bar, and connects the first right front vertical bar and the second right front vertical bar respectively. There are multiple right front connecting bars, and the multiple right front connecting bars are arranged vertically spaced apart from each other. The right rear movable guardrail includes a first right rear vertical bar, a second right rear vertical bar, and a right rear connecting bar. The second right rear vertical bar and the first right rear vertical bar are spaced apart from each other on the left and right sides. The right rear connecting bar is arranged along the left and right direction and is located between the first right rear vertical bar and the second right rear vertical bar, and connects the first right rear vertical bar and the second right rear vertical bar respectively. There are multiple right rear connecting bars, which are arranged vertically spaced apart from each other. The first right front vertical bar and the first right rear vertical bar are horizontally rotatably connected to the front side of the right movable guardrail and the rear side of the right movable guardrail, respectively. The second right front vertical bar and the second right rear vertical bar are detachably connected to the lower right side of the front fixed guardrail and the lower right side of the rear fixed guardrail, respectively. The right end of the right front retractable chain is fixed to the right end of the uppermost right front connecting rod, and the right end of the right rear retractable chain is fixed to the right end of the uppermost right rear connecting rod.

8. The prefabricated T-beam negative bending moment tensioning construction work frame as described in claim 1, characterized in that, The prefabricated T-beam negative bending moment tensioning construction frame also includes a left front fixing buckle, a right front fixing buckle, a left rear fixing buckle, and a right rear fixing buckle. The left front fixing buckle, the right front fixing buckle, the left rear fixing buckle, and the right rear fixing buckle are respectively set on the left end of the front suspension rod, the right end of the front suspension rod, the left end of the rear suspension rod, and the right end of the rear suspension rod. The right end of the left front take-up chain, the left end of the right front take-up chain, the right end of the left rear take-up chain, and the left end of the right rear take-up chain are detachably connected to the left front fixing buckle, the right front fixing buckle, the left rear fixing buckle, and the right rear fixing buckle.

9. The prefabricated T-beam negative bending moment tensioning construction work frame as described in claim 8, characterized in that, The left front fixing buckle, the right front fixing buckle, the left rear fixing buckle, and the right rear fixing buckle are all U-shaped fixing buckles.

10. The prefabricated T-beam negative bending moment tensioning construction work frame as described in claim 1, characterized in that, The prefabricated T-beam negative bending moment tensioning construction work frame also includes a first left hinge, a first right hinge, a second left hinge, a second right hinge, a left front hinge, a left rear hinge, a right front hinge, and a right rear hinge. The right side of the bottom left movable platform and the left side of the bottom right movable platform are rotatably connected to the left side of the bottom middle fixed platform and the right side of the bottom middle fixed platform in the front-back direction via the first left hinge and the first right hinge, respectively. The lower sides of the left movable guardrail and the lower sides of the right movable guardrail are connected via the second left hinge and the second right hinge, respectively. The left side of the bottom left movable platform and the right side of the bottom right movable platform are rotatably connected around the front-back direction. The left side of the left front movable guardrail and the left side of the left rear movable guardrail are horizontally rotatably connected to the front side of the left movable guardrail and the rear side of the left movable guardrail respectively via the left front hinge and the left rear hinge. The right side of the right front movable guardrail and the right side of the right rear movable guardrail are horizontally rotatably connected to the front side of the right movable guardrail and the rear side of the right movable guardrail respectively via the right front hinge and the right rear hinge.

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