Bridge floor hogging moment steel beam tensioning construction operation frame

Abstract

The utility model belongs to the technical field of highway bridge construction, and particularly relates to a bridge floor hogging moment steel beam tensioning construction operation frame which comprises a simple operation frame bottom frame, a C-shaped hanging bracket, a jack universal rotating turntable and an I-shaped steel sliding rail. Universal pulleys capable of walking on the ground are fixedly installed at the four corners of the bottom end of the simple operation frame bottom frame, simple operation frame supporting legs are fixedly installed on the two sides of the top face of the simple operation frame bottom frame, and the simple operation frame bottom frame and the simple operation frame supporting legs form a triangular shape. The I-shaped steel sliding rail is fixedly installed at the top ends of supporting legs of the simple operation frame, the electric I-shaped steel pulley walking tackle is installed on the I-shaped steel sliding rail in a sliding mode, the lifting chain block is hung at the bottom end of the electric I-shaped steel pulley walking tackle, and the C-shaped hanging bracket is hung at the bottom end of the lifting chain block. And the jack universal rotating turntable is rotationally mounted on the inner wall of the bottom end of the C-shaped hanging bracket. The utility model has the advantages of high construction efficiency and simple and safe construction operation.

Description

Technical Field

[0001] This utility model relates to the field of highway bridge construction technology; specifically, it relates to a bridge deck negative bending moment steel strand tensioning operation frame. Background Technology

[0002] During negative moment tensioning construction of highway bridges, the negative moment tensioning jacks must be installed at the negative moment anchorage position below the beam slab. Before installation, the anchorage, tool anchor, and limiting plate must also be installed. Typically, the negative moment tensioning jacks, anchorage, tool anchor, and limiting plate are manually hoisted using polyester ropes, and then adjusted and installed by personnel below the bridge. This method requires a large workforce, has low efficiency, takes a long time, and results in high labor intensity and significant safety risks. The existing negative moment tensioning construction method affects the construction progress, increases the work cycle time for construction teams, and increases labor input, while also posing safety risks. Furthermore, after tensioning, the jacks are removed manually using polyester ropes to lift them from below the beam slab. However, regardless of installation or removal, the weight of the jacks is primarily borne by the personnel installing them below the beam slab. As the load-bearing requirements of modern bridges increase, the tension force of the negative moment steel strands also increases, correspondingly increasing the size and weight of the jacks. Therefore, without the aid of auxiliary tools, using this method to construct wet joints is neither scientific, reasonable, nor economical and practical. Utility Model Content

[0003] In view of this, the present invention provides a bridge deck negative bending moment steel strand tensioning operation frame, thereby solving or at least alleviating the above-mentioned problems existing in the prior art.

[0004] To achieve the aforementioned objectives, this utility model provides a bridge deck negative bending moment steel strand tensioning construction operation frame, including a simple operation frame base, a C-shaped hanger, a jack universal rotating turntable, and an I-beam slide rail; the four corners of the bottom end of the simple operation frame base are all fixedly installed with universal pulleys that can move on the ground, and the two sides of the top surface of the simple operation frame base are all fixedly installed with simple operation frame legs, the simple operation frame base and the simple operation frame legs forming a triangle, the I-beam slide rail is fixedly installed on the top of the simple operation frame legs, an electric I-beam pulley traveling trolley is slidably installed on the I-beam slide rail, a slide rail mechanical limit plate is fixedly installed at the end of the I-beam slide rail, a lifting chain hoist is suspended at the bottom end of the electric I-beam pulley traveling trolley, the C-shaped hanger is suspended at the bottom end of the lifting chain hoist, and the jack universal rotating turntable is rotatably installed on the inner wall of the bottom end of the C-shaped hanger.

[0005] In the bridge deck negative bending moment steel strand tensioning construction operation frame as described above, optionally, a semi-circular collar is fixedly installed at the top of the jack universal rotating turntable, and the jack is engaged with the semi-circular collar.

[0006] In the bridge deck negative bending moment steel strand tensioning construction operation frame described above, optionally, the top end of the jack universal rotating turntable is provided with a fixed collar and a movable collar, the jack is engaged with the fixed collar and the movable collar, the fixed collar is fixedly installed on the top surface of the jack universal rotating turntable, the movable collar is slidably installed on the top surface of the jack universal rotating turntable, and the outer wall of the movable collar is fitted with an arc-shaped guide rail.

[0007] In the bridge deck negative bending moment steel strand tensioning operation frame described above, optionally, the outer surface of the movable collar is provided with a groove, the guide rail is slidably installed in the groove, a limit block is fixedly installed on one side of the guide rail, openings are provided on both sides of the movable collar, the limit block can be inserted into the opening, movable rods are slidably installed on both sides of the guide rail, the bottom ends of the two movable rods can be inserted into the limit blocks, the top end of the movable rod is provided with a U-shaped connecting rod, the two ends of the connecting rod are respectively fixedly connected to the top ends of the two movable rods, and the connecting rod is slidably installed on the outer surface of the guide rail.

[0008] In the bridge deck negative bending moment steel strand tensioning operation frame as described above, optionally, a first limiting groove is fixedly installed on the outer surface of the guide rail near the limiting block, and a second limiting groove is fixedly installed on the outer surface of the fixing collar corresponding to the limiting block. A driving rod is slidably installed inside the second limiting groove, and the end of the driving rod away from the second limiting groove is slidably installed in the first limiting groove.

[0009] In the bridge deck negative bending moment steel strand tensioning operation frame described above, optionally, a connecting block is fixedly installed in the area of ​​the drive rod located in the second limiting groove, the connecting block is slidably installed in the second limiting groove, a second spring is fixedly installed between the connecting block and the bottom inner wall of the second limiting groove, a support block is slidably installed in the area of ​​the drive rod located in the first limiting groove, the support block is slidably installed in the first limiting groove, and a first spring is fixedly installed between the support block and the bottom inner wall of the first limiting groove.

[0010] In the bridge deck negative bending moment steel strand tensioning construction operation frame as described above, optionally, a cross-shaped movable plate is slidably installed inside the universal rotating turntable of the jack, and an insert rod is fixedly installed on the bottom surface of the movable plate. The insert rod can be inserted into the inner wall of the C-shaped hanger. One end of the movable plate penetrates through the outer wall of the universal rotating turntable of the jack and is slidably installed with a sliding rod. The top end of the sliding rod is rotatably installed on the drive rod.

[0011] In the bridge deck negative bending moment steel strand tensioning construction operating frame described above, optionally, the bottom end of the jack universal rotating turntable is provided with a movable sleeve, the movable sleeve is slidably installed on the C-shaped hanger, a third spring is fixedly installed between the movable sleeve and the C-shaped hanger, a C-shaped drive frame is fixedly installed on the side of the movable sleeve near the C-shaped hanger, the drive frame is slidably installed on the inner wall of the C-shaped hanger, clamping rods are rotatably installed on both sides of the top of the drive frame, the two clamping rods are arranged in opposite directions, the top of the clamping rods penetrates the top outer wall of the C-shaped hanger, and contact rods are fixedly installed on both sides of the top of the C-shaped hanger, the two contact rods are arranged in opposite directions.

[0012] In the bridge deck negative bending moment steel strand tensioning operation frame described above, optionally, limit rods are fixedly installed on both sides of the bottom end of the guide rail. The limit rods are slidably installed on the top surface of the jack universal rotating turntable. The end of the limit rod passes through the bottom end of the fixed collar and is fixedly installed with a blocking block.

[0013] This utility model discloses a bridge deck negative bending moment steel strand tensioning construction operation frame, which adopts a lifting chain hoist that can be raised and lowered, a C-shaped hanger suspended at the bottom of the lifting chain hoist, and a jack universal rotating turntable rotatably installed on the C-shaped hanger. It can achieve the effect of simple construction operation, saving time and labor. In addition, by utilizing the C-shaped hanger and the jack universal rotating turntable, the C-shaped hanger ensures the overall force balance of the jack. After positioning, the jack can be aligned with the tensioning slot by rotating the jack universal rotating turntable. The construction efficiency is high and the construction operation is simple and safe. Attached Figure Description

[0014] The disclosure of this utility model will become more apparent with reference to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings:

[0015] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model;

[0016] Figure 2 This is a structural schematic diagram from another perspective of Embodiment 1 of the present invention;

[0017] Figure 3 This is a structural schematic diagram of Embodiment 2 of the present invention;

[0018] Figure 4 This is a schematic diagram of the connection structure between the C-shaped hanger and the lifting chain hoist of this utility model;

[0019] Figure 5 This is a structural schematic diagram of the C-shaped hanger of this utility model;

[0020] Figure 6 For the present utility model Figure 5 Enlarged view of point A in the middle;

[0021] Figure 7 For the present utility model Figure 5 Enlarged view at point B in the middle;

[0022] Figure 8 This is a schematic diagram of the structure of the movable plate of this utility model;

[0023] Figure 9 This is a schematic diagram of the structure of the movable rod of this utility model;

[0024] Figure 10 This is a schematic diagram of the structure of the movable collar of this utility model, which rotates 90 degrees.

[0025] Attached reference numerals: 1. Universal pulley; 2. Base frame of simple operating frame; 3. Universal rotating turntable of jack; 3-1. Fixed collar; 3-2. Moving collar; 3-21. Slide groove; 3-22. Opening; 3-3. Guide rail; 3-31. Limiting block; 3-4. Moving rod; 3-41. Connecting rod; 3-5. Drive rod; 3-51. Connecting block; 3-52. Support block; 3-6. Moving plate; 3-7. Insert rod; 3-8. Sliding rod; 3-9. Limiting rod; 3-91. Blocking block; 4. C-shaped hanger; 4-1. Moving sleeve; 4-2. Drive frame; 4-3. Clamping rod; 4-4. Contact rod; 5. Support leg of simple operating frame; 6. Lifting chain hoist; 7. Electric I-beam steel pulley traveling trolley; 8. I-beam steel slide rail; 9. Slide rail mechanical limit plate. Detailed Implementation

[0026] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] like Figure 1 and Figure 2As shown in Embodiment 1, a bridge deck negative bending moment steel strand tensioning construction operation frame includes a simple operation frame base 2, a C-shaped hanger 4, a jack universal rotating turntable 3, and an I-beam slide rail 8. Universal pulleys 1 capable of walking on the ground are fixedly installed at the four corners of the bottom end of the simple operation frame base 2. Simple operation frame legs 5 are fixedly installed on both sides of the top surface of the simple operation frame base 2, forming a triangular shape with the simple operation frame base 2 and the simple operation frame legs 5. The I-beam slide rail 8 is fixedly installed at the top of the simple operation frame legs 5. An electric I-beam pulley traveling trolley 7 is slidably installed on the I-beam slide rail 8. A slide rail mechanical limit plate 9 is fixedly installed at the end of the I-beam slide rail 8. A lifting chain hoist 6 is suspended at the bottom end of the electric I-beam pulley traveling trolley 7. The C-shaped hanger 4 is suspended at the bottom end of the lifting chain hoist 6. The jack universal rotating turntable 3 is rotatably installed on the inner wall of the bottom end of the C-shaped hanger 4.

[0028] When in use, first control the lifting chain hoist 6 to move downward so that the bottom hook of the lifting chain hoist 6 can hook the top lifting lug of the C-shaped hanger 4. Then install the jack on the jack universal rotating turntable 3 and adjust the jack to face the direction to be used so that the jack and the C-shaped hanger 4 are perpendicular.

[0029] Once the jack is in place, hold the leg 5 of the simple operating frame and push the base 2 of the simple operating frame so that the universal pulley 1 slides on the ground. The entire operating frame can move at any position on the bridge deck without manual lifting, only pushing by hand, making construction safe and reliable.

[0030] Once the cable slides to the designated location, the lifting chain hoist 6 is raised, causing the C-shaped hanger to lift the jack. When the end of the jack contacts the steel bar, the jack is activated, completing the negative bending moment tensioning construction of the highway bridge. The lifting chain hoist 6 allows the jack to be moved up and down simply by operating the chain hoist, replacing manual labor. The construction operation is simple, saving time and effort. The C-shaped hanger 4 and the jack universal rotating turntable 3 ensure the overall force balance of the jack. After reaching the designated position, the jack can be aligned with the tensioning slot by rotating the jack universal rotating turntable 3. The construction efficiency is high, and the construction operation is simple and safe.

[0031] After a steel bar has completed the negative bending moment tensioning construction of the highway bridge, the jack is separated from the steel bar, and the electric I-beam pulley trolley 7 is activated, allowing it to slide on the I-beam slide rail 8 to move to the next steel bar. The operating device is equipped with the electric I-beam pulley trolley 7, and the jack can move easily along the direction of the I-beam slide rail 8. The electric I-beam pulley trolley 7 is controlled by a motor, ensuring reliable movement and braking, saving labor, increasing construction efficiency, and reducing the labor intensity of construction workers. At the same time, the operating device, through the external cantilever I-beam slide rail 8, ensures that the overall frame remains inside the bridge deck during the tensioning of the side beams, and the slide rail end is equipped with a limiting steel plate, making construction safe and reliable, and not restricted by the construction space.

[0032] A semi-circular collar is fixedly installed at the top of the jack universal rotary turntable 3, and the jack is snapped onto the semi-circular collar.

[0033] The use of a semi-circular collar makes the installation of the jack more convenient.

[0034] like Figures 3 to 10 In embodiment two, the top of the jack universal rotary turntable 3 is provided with a fixed collar 3-1 and a movable collar 3-2. The jack is engaged with the fixed collar 3-1 and the movable collar 3-2. The fixed collar 3-1 is fixedly installed on the top surface of the jack universal rotary turntable 3, and the movable collar 3-2 is slidably installed on the top surface of the jack universal rotary turntable 3. The outer wall of the movable collar 3-2 is fitted with an arc-shaped guide rail 3-3.

[0035] When installing the jack, first pull the movable collar 3-2 to create a certain distance between the fixed collar 3-1 and the movable collar 3-2. This increases the contact area of ​​the jack and makes it more stable when placed.

[0036] The outer surface of the movable collar 3-2 is provided with a groove 3-21. The guide rail 3-3 is slidably installed in the groove 3-21. A limit block 3-31 is fixedly installed on one side of the guide rail 3-3. Openings 3-22 are provided on both sides of the movable collar 3-2. The limit block 3-31 can be inserted into the opening 3-22. Moving rods 3-4 are slidably installed on both sides of the guide rail 3-3. The bottom ends of the two moving rods 3-4 can be inserted into the limit block 3-31. The top end of the moving rod 3-4 is provided with a U-shaped connecting rod 3-41. The two ends of the connecting rod 3-41 are fixedly connected to the top ends of the two moving rods 3-4 respectively. The connecting rod 3-41 is slidably installed on the outer surface of the guide rail 3-3.

[0037] After the jack is placed on the fixed collar 3-1 and the movable collar 3-2, the movable collar 3-2 is rotated, allowing the guide rail 3-3 to rotate within the slide groove 3-21. This causes the movable collar 3-2 to switch from supporting the bottom of the jack to contacting the top of the jack. This limits both the top surface of the jack and the ground, preventing changes in the lever arm of the jack during use and avoiding tilting. At the same time, the cooperation of the limiting block 3-31 and the opening 3-22 restricts the position of one end of the collar, ensuring that the movable collar 3-2 can rotate 180 degrees when rotating.

[0038] A first limiting groove is fixedly installed on the outer surface of the guide rail 3-3 near the limiting block 3-31. A second limiting groove is fixedly installed on the outer surface of the fixing collar 3-1 corresponding to the limiting block 3-31. A drive rod 3-5 is slidably installed inside the second limiting groove. The end of the drive rod 3-5 away from the second limiting groove is slidably installed in the first limiting groove.

[0039] When the movable collar 3-2 is at the bottom of the jack, the end of the movable collar 3-2 contacts the bottom end of the movable rod 3-4, and pushes the connecting rod 3-41 upward, so that the driving rod 3-5 moves upward in the first limiting groove and the second limiting groove.

[0040] When the movable collar 3-2 is at the top of the jack, its end can contact the connecting rod 3-41 and push the movable collar downward, causing the drive rod 3-5 to move downward within the first and second limiting grooves. The first and second limiting grooves ensure that the drive rod 3-5 remains stable during movement. Simultaneously, when the movable collar 3-2 is at the top of the jack, a pin can be inserted to hold the movable collar 3-2 at the top of the jack.

[0041] A connecting block 3-51 is fixedly installed in the area of ​​the drive rod 3-5 located in the second limiting groove. The connecting block 3-51 is slidably installed in the second limiting groove. A second spring is fixedly installed between the connecting block 3-51 and the bottom inner wall of the second limiting groove. A support block 3-52 is slidably installed in the area of ​​the drive rod 3-5 located in the first limiting groove. The support block 3-52 is slidably installed in the first limiting groove. A first spring is fixedly installed between the support block 3-52 and the bottom inner wall of the first limiting groove.

[0042] When the drive rod 3-5 moves downward, it can drive the connecting block 3-51 and the support block 3-52 to move downward, and compress the first spring and the second spring. When the first spring and the second spring are no longer under force, the drive rod 3-5 can move upward to reset. Since the support block 3-52 and the drive rod 3-5 are slidably set, they will not be affected by the distance between the moving collar 3-2 and the fixed collar 3-1.

[0043] The jack universal rotary turntable 3 has a cross-shaped movable plate 3-6 slidably installed inside. The bottom surface of the movable plate 3-6 is fixedly installed with a plug rod 3-7, which can be inserted into the inner wall of the C-shaped hanger 4. One end of the movable plate 3-6 passes through the outer wall of the jack universal rotary turntable 3 and is slidably installed with a sliding rod 3-8. The top end of the sliding rod 3-8 is rotatably installed on the drive rod 3-5.

[0044] When the drive rod 3-5 moves downward, it can drive the sliding rod 3-8 to move downward. At this time, the bottom end of the sliding rod 3-8 slides relative to each other, so that the moving plate 3-6 can move downward and drive the insertion rod 3-7 to insert into the inner wall of the C-shaped hanger 4, so that the jack universal rotating turntable 3 and the C-shaped hanger 4 are locked together, which solves the problem in Embodiment 1 that the jack is not stable when in use because there is no locking between the C-shaped hanger 4 and the jack universal rotating turntable 3.

[0045] At the same time, the moving collar 3-2 is rotated in the opposite direction, causing the drive rod 3-5 to move upward, so that the insertion rod 3-7 is separated from the C-shaped hanger 4. At this time, the universal rotating turntable 3 of the jack is unlocked, which can change the orientation of the jack without moving the entire simple operating frame base 2 to switch, thus reducing the practicality of the construction area.

[0046] The bottom end of the jack's universal rotary turntable 3 is provided with a movable sleeve 4-1, which is slidably mounted on the C-shaped hanger 4. A third spring is fixedly installed between the movable sleeve 4-1 and the C-shaped hanger 4. A C-shaped drive frame 4-2 is fixedly installed on the side of the movable sleeve 4-1 near the C-shaped hanger 4. The drive frame 4-2 is slidably mounted on the inner wall of the C-shaped hanger 4. Clamping rods 4-3 are rotatably mounted on both sides of the top of the drive frame 4-2. The two clamping rods 4-3 are set in opposite directions. The top of the clamping rods 4-3 penetrates the top outer wall of the C-shaped hanger 4. Contact rods 4-4 are fixedly installed on both sides of the top of the C-shaped hanger 4. The two contact rods 4-4 are set in opposite directions.

[0047] A contact block is fixedly installed on the C-shaped frame. The contact block contacts the outer wall of the clamping rod 4-3. When the moving plate 3-6 moves downward, it can press the moving sleeve 4-1, so that the third spring is compressed and drives the drive frame 4-2 to move downward, so that the two clamping rods 4-3 come closer to each other and clamp the hook at the bottom of the lifting chain hoist 6. The hook is clamped by the contact rod 4-4 and the clamping rod 4-3, so that the C-shaped hanger 4 has a certain angle of locking on the hook, which makes it easy for the jack to remain stable during use.

[0048] Limiting rods 3-9 are fixedly installed on both sides of the bottom end of the guide rail 3-3. The limiting rods 3-9 are slidably installed on the top surface of the jack universal rotary turntable. The end of the limiting rod 3-9 passes through the bottom end of the fixing collar 3-1 and is fixedly installed with a blocking block 3-91.

[0049] When the movable collar 3-2 is pulled, the limiting rod 3-9 can move on the top surface of the jack universal rotary table 3, so that the movable collar 3-2 can have a certain distance from the fixed collar 3-1, which is convenient for supporting the jack. At the same time, the blocking block 3-91 can limit the maximum sliding distance of the limiting rod 3-9 and prevent the limiting rod 3-9 from disengaging from the jack universal rotary table 3.

[0050] Compared with Embodiment 1, Embodiment 2 makes the jack more stable during installation, prevents the jack from falling off during use, and connects the hooks at the bottom of the C-shaped hanger 4, the jack universal rotating turntable 3, and the lifting chain hoist 6, making the jack more stable during use.

[0051] The technical scope of this utility model is not limited to the contents of the above description. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the scope of this utility model.

Claims

1. A negative moment bridge steel tendon tensioning construction scaffold, characterized in that, The system includes a simple operating frame base (2), a C-shaped hanger (4), a jack universal rotating turntable (3), and an I-beam slide rail (8). The four corners of the bottom of the simple operating frame base (2) are each fixedly equipped with universal pulleys (1) that allow it to move on the ground. Simple operating frame support legs (5) are fixedly installed on both sides of the top surface of the simple operating frame base (2). The simple operating frame base (2) and the simple operating frame support legs (5) form a triangle. The I-beam slide rail (8) is fixedly installed... At the top of the simple operating frame support leg (5), an electric I-beam pulley traveling trolley (7) is slidably installed on the I-beam slide rail (8). A slide rail mechanical limit plate (9) is fixedly installed at the end of the I-beam slide rail (8). A lifting chain hoist (6) is suspended at the bottom of the electric I-beam pulley traveling trolley (7). The C-shaped hanger (4) is suspended at the bottom of the lifting chain hoist (6). The jack universal rotating turntable (3) is rotatably installed on the inner wall of the bottom end of the C-shaped hanger (4).

2. The negative moment steel beam tensioning construction frame according to claim 1, wherein, A semi-circular collar is fixedly installed at the top of the universal rotating turntable (3) of the jack, and the jack is snapped onto the semi-circular collar.

3. The negative moment steel beam tensioning construction frame according to claim 1, wherein, The top of the universal rotary turntable (3) of the jack is provided with a fixed collar (3-1) and a movable collar (3-2). The jack is engaged with the fixed collar (3-1) and the movable collar (3-2). The fixed collar (3-1) is fixedly installed on the top surface of the universal rotary turntable (3) of the jack. The movable collar (3-2) is slidably installed on the top surface of the universal rotary turntable (3) of the jack. The outer wall of the movable collar (3-2) is fitted with an arc-shaped guide rail (3-3).

4. The negative moment steel truss tensioning construction scaffold of claim 3, wherein, The outer surface of the movable collar (3-2) is provided with a groove (3-21). The guide rail (3-3) is slidably installed in the groove (3-21). A limiting block (3-31) is fixedly installed on one side of the guide rail (3-3). Openings (3-22) are provided on both sides of the movable collar (3-2). The limiting block (3-31) can be inserted into the opening (3-22). Movable rods (3-4) are slidably installed on both sides of the guide rail (3-3). The bottom ends of the two movable rods (3-4) can be inserted into the limiting block (3-31). The top end of the movable rod (3-4) is provided with a U-shaped connecting rod (3-41). The two ends of the connecting rod (3-41) are fixedly connected to the top ends of the two movable rods (3-4) respectively. The connecting rod (3-41) is slidably installed on the outer surface of the guide rail (3-3).

5. The negative moment steel truss tensioning construction scaffold of claim 4, wherein, The guide rail (3-3) has a first limiting groove fixedly installed on the outer surface of the side near the limiting block (3-31). The fixed collar (3-1) has a second limiting groove fixedly installed on the outer surface of the side corresponding to the limiting block (3-31). A drive rod (3-5) is slidably installed inside the second limiting groove. The end of the drive rod (3-5) away from the second limiting groove is slidably installed in the first limiting groove.

6. The negative moment steel truss tensioning construction scaffold of claim 5, wherein, A connecting block (3-51) is fixedly installed in the area of ​​the drive rod (3-5) within the second limiting groove. The connecting block (3-51) is slidably installed in the second limiting groove. A second spring is fixedly installed between the connecting block (3-51) and the bottom inner wall of the second limiting groove. A support block (3-52) is slidably installed in the area of ​​the drive rod (3-5) within the first limiting groove. The support block (3-52) is slidably installed in the first limiting groove. A first spring is fixedly installed between the support block (3-52) and the bottom inner wall of the first limiting groove.

7. The negative moment steel beam tensioning construction frame of claim 5, wherein, A cross-shaped movable plate (3-6) is slidably installed inside the universal rotating turntable (3) of the jack. A plug rod (3-7) is fixedly installed on the bottom surface of the movable plate (3-6). The plug rod (3-7) can be inserted into the inner wall of the C-shaped hanger (4). One end of the movable plate (3-6) penetrates the outer wall of the universal rotating turntable (3) of the jack and is slidably installed with a sliding rod (3-8). The top end of the sliding rod (3-8) is rotatably installed on the drive rod (3-5).

8. The negative moment steel truss tensioning construction scaffold of claim 7, wherein, The bottom end of the jack universal rotating turntable (3) is provided with a movable sleeve (4-1). The movable sleeve (4-1) is slidably installed on the C-shaped hanger (4). A third spring is fixedly installed between the movable sleeve (4-1) and the C-shaped hanger (4). A C-shaped drive frame (4-2) is fixedly installed on the side of the movable sleeve (4-1) near the C-shaped hanger (4). The drive frame (4-2) is slidably installed on the inner wall of the C-shaped hanger (4). Clamping rods (4-3) are rotatably installed on both sides of the top of the drive frame (4-2). The two clamping rods (4-3) are arranged in opposite directions. The top of the clamping rods (4-3) penetrates the top outer wall of the C-shaped hanger (4). Contact rods (4-4) are fixedly installed on both sides of the top of the C-shaped hanger (4). The two contact rods (4-4) are arranged in opposite directions.

9. The negative moment steel truss tensioning construction scaffold of claim 3, wherein, Limiting rods (3-9) are fixedly installed on both sides of the bottom end of the guide rail (3-3). The limiting rods (3-9) are slidably installed on the top surface of the jack universal rotary turntable. The end of the limiting rod (3-9) passes through the bottom end of the fixing collar (3-1) and is fixedly installed with a blocking block (3-91).

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