Early-strip jacking and early-strip support system

Abstract

The utility model provides a kind of early dismantling roof support and early dismantling support system, including main rod and keel support part;The hollow support frame is fixed in the top of main rod;Keel support part is vertically slidably installed in hollow support frame, and lifting device is equipped on hollow support frame;Lifting device includes lifting frame, drive screw, first nut and second nut on screw thread installation on drive screw;Lifting frame is located in hollow support frame, and the top of lifting frame both ends is connected with the bottom of keel support part, and the bottom of lifting frame both ends is connected with first nut and second nut respectively;Drive screw is horizontally rotatably installed on hollow support frame, and one end of drive screw is located outside hollow support frame;Drive screw is used to drive lifting frame to stretch or contract in vertical direction, to drive keel support part vertically slide;Since one end of drive screw is located outside hollow support frame, it can be conveniently connected with electric wrench, realize the automatic screwing of drive screw, effectively reduce the labor intensity of adjustment personnel.

Description

Technical Field

[0001] This utility model relates to the field of scaffolding technology, and in particular to an early-stripping top support and early-stripping support system. Background Technology

[0002] In modern architecture, concrete pouring technology is generally used to construct load-bearing components such as floor slabs. During concrete pouring, the formwork support system is an essential component, its main function being to support the newly poured concrete structure and ensure its stable formation during the curing process.

[0003] However, traditional formwork support systems require waiting for the concrete to reach 100% strength before removing the formwork components (i.e., main and secondary joists), resulting in excessively long formwork occupancy times and reduced formwork turnover rates. To improve formwork turnover rates, early-removal support systems have emerged.

[0004] The early-stripping support system includes scaffolding and an early-stripping top support, with the top support positioned at the top of the scaffolding uprights. In the prior art, utility model patent application number CN202322417400X discloses an early-stripping top support, which includes a screw rod, a first U-shaped support at the top of the screw rod, a second U-shaped support sleeved on the screw rod, a first adjusting nut at the bottom of the second U-shaped support, and a second adjusting nut below the first adjusting nut. The second U-shaped support supports the keel. By tightening the first adjusting nut, the height of the second U-shaped support can be adjusted, thereby changing the height of the keel. When the strength of the poured concrete structure meets the construction requirements (generally 70%), simply tightening the first adjusting nut downwards allows the keel placed on the second U-shaped support to be removed, achieving early keel stripping. However, because there are components above and below the first adjusting nut, tightening the first adjusting nut can only be done manually, resulting in low work efficiency and high labor intensity when adjusting the height of the second U-shaped support (i.e., the keel support component). Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide an early removal top support and early removal support system, which optimizes the height adjustment structure of the keel support component so that operators can use power tools to adjust the height of the keel support component, effectively reducing the labor intensity of adjusting the height of the keel support component and improving the adjustment efficiency.

[0006] To achieve the above objectives, this utility model provides an early-stripping top support, comprising a main pole and a keel support component. The main pole is installed on the uprights of the scaffold via a height adjustment device. A hollow support frame is fixed to the top of the main pole, and the hollow support frame is used to support the template. The keel support component is vertically slidably installed within the hollow support frame, and the hollow support frame is provided with a lifting device for adjusting the height of the keel support component. The lifting device includes a lifting frame, a drive screw, and a first nut and a second nut threaded onto the drive screw. The lifting frame is located within the hollow support frame, and both ends of the top of the lifting frame are connected to the keel. The bottom of the support component is connected, and the two ends of the bottom of the lifting frame are respectively connected to the first nut and the second nut; the drive screw is horizontally rotatably mounted on the hollow support frame, and one end of the drive screw is located outside the hollow support frame; the drive screw is used to drive the lifting frame to extend or retract in the vertical direction, so as to drive the keel support component to slide vertically; since the drive screw is horizontally set and one end of the drive screw is located outside the hollow support frame, it can be easily connected to an electric wrench, thereby facilitating the automatic tightening of the drive screw with the help of an electric wrench, effectively improving the work efficiency when adjusting the height of the keel support component, and reducing the labor intensity of the adjustment personnel.

[0007] Preferably, the drive screw is a bidirectional screw, and the first nut and the second nut are threaded onto threaded sections of the bidirectional screw with different directions of rotation; thus, when the bidirectional screw is screwed, the first nut and the second nut on it can move closer or further away simultaneously, so that the lifting frame can extend or retract in the vertical direction.

[0008] Preferably, the drive screw is a one-way screw; thus, when the one-way screw is turned, the first nut and the second nut on it can move synchronously in the same direction, so that the lifting frame can extend or retract in the vertical direction.

[0009] Preferably, the lifting frame includes a first connecting rod and a second connecting rod arranged symmetrically; the top ends of the first connecting rod and the second connecting rod are hinged to the bottom of the keel support; the bottom ends of the first connecting rod and the second connecting rod are respectively hinged to a first nut and a second nut; thus, when the bidirectional screw is turned, the first nut and the second nut can move closer or further away simultaneously to change the tilt angle of the first connecting rod and the second connecting rod, thereby causing the lifting frame composed of the first connecting rod and the second connecting rod to extend or retract in the vertical direction.

[0010] Preferably, the lifting frame is a scissor lift; the bottom of the lifting frame is slidably provided with a first slider and a second slider, and the sliding direction of each slider is parallel to the axial direction of the bidirectional screw; the top two ends of the scissor lift are respectively hinged to the first slider and the second slider; thus, when the bidirectional screw is turned, the first nut and the second nut can move closer or further away simultaneously to change the crossing angle of the scissor lift, thereby realizing the extension or retraction of the scissor lift in the vertical direction.

[0011] Preferably, the lifting frame includes a first connecting rod and a second connecting rod arranged in parallel; the top ends of the first connecting rod and the second connecting rod are both hinged to the bottom of the keel support; the bottom ends of the first connecting rod and the second connecting rod are respectively hinged to a first nut and a second nut; thus, when the unidirectional screw is turned, the first nut and the second nut can move synchronously in the same direction to change the tilt angle of the first connecting rod and the second connecting rod, thereby causing the lifting frame composed of the first connecting rod and the second connecting rod to extend or retract in the vertical direction.

[0012] Preferably, there are two sets of lifting devices, and the two sets of lifting devices are arranged at intervals below the keel support to ensure the lifting stability of the keel support.

[0013] Preferably, the hollow support frame is provided with multiple vertical sliding rods, and the keel support is slidably installed on the vertical sliding rods to ensure the sliding stability of the keel support.

[0014] Preferably, the main rod is a lead screw; the height adjustment device includes an adjusting nut threaded onto the lead screw; the lower end of the lead screw is inserted into the upright of the scaffold, and the adjusting nut is supported on the top of the upright; thus, by simply turning the adjusting nut, the insertion depth of the lead screw can be changed, thereby achieving the purpose of adjusting the height of the hollow support frame.

[0015] This utility model also provides an early-stripping support system, which includes scaffolding and the aforementioned early-stripping top support.

[0016] As described above, the adjustable-length tie rod and early-release support system of this utility model have the following beneficial effects:

[0017] This application utilizes a hollow support frame for template support and a lifting device to drive the keel support component to slide vertically within the hollow support frame, thereby adjusting the height of the keel support component. The lifting device includes a lifting frame, a drive screw horizontally rotatably mounted on the hollow support frame, and a first nut and a second nut threaded onto the drive screw. This allows the lifting frame to extend or retract vertically when the drive screw is tightened, thus adjusting the height of the keel support component. Since one end of the drive screw is located outside the hollow support frame, it can be easily connected to an electric wrench, facilitating automatic tightening of the drive screw using automated bolt tightening devices such as electric wrenches. This effectively improves the work efficiency during keel support component height adjustment and reduces the labor intensity of the adjustment personnel. Attached Figure Description

[0018] Figure 1 This is a front view of an embodiment of the present application showing the early removal of the top support.

[0019] Figure 2 for Figure 1 A partial top-view cross-section.

[0020] Figure 3 This is the front view of the hollow support frame in this application.

[0021] Figure 4 This is a schematic diagram showing the connection between the lifting frame, the keel support, and the double-headed screw when using a double-headed screw.

[0022] Figure 5 This is a schematic diagram showing the fit between the lifting frame, the keel support, and the one-way screw when using a one-way screw.

[0023] Figure 6 This is a schematic diagram of the main rod being assembled on the upright in one embodiment of this application.

[0024] Figure 7 This is a schematic diagram of the main rod being assembled on the upright in another embodiment of this application.

[0025] Figure 8 This is a schematic diagram of the early dismantling support system in one embodiment of this application.

[0026] Figure 9 for Figure 8 Enlarged view of point A.

[0027] Explanation of reference numerals in the attached figures

[0028] Main rod 110, keel support 120, hollow support frame 130, side plate 131, top plate 132, bottom plate 133, lifting frame 140, first connecting rod 141, second connecting rod 142, drive screw 150, first nut 151, second nut 152, vertical slide rod 160, adjusting nut 171, adjusting cylinder 172, horizontal slide rail 180, first slider 181, second slider 182;

[0029] Early removal of top support 100, scaffolding 200, formwork 300, main keel 410, secondary keel 420. Detailed Implementation

[0030] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0031] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0032] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0033] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0034] like Figure 1and Figure 9 As shown, the early-release top support 100 provided by this utility model includes a main pole 110, a keel support component 120, a hollow support frame 130, and a lifting device. The main pole 110 is installed on the upright 210 of the scaffold 200 via a height adjustment device. The hollow support frame 130 is fixed to the top of the main pole 110 to support the template 300. The keel support component 120 is vertically slidably installed inside the hollow support frame 130 to support the main keel 410. The lifting device is installed on the hollow support frame 130 to drive the keel support component 120 to slide up and down, thereby adjusting the height of the keel support component 120 and thus adjusting the height of the main keel 410.

[0035] For ease of description, in the following embodiments, the height direction of the main keel 410 in its placement state (i.e., placed on the keel support 120) is defined as the vertical direction, the length direction of the main keel 410 in its placement state is defined as the front-back direction, and the direction perpendicular to both the vertical and front-back directions is defined as the left-right direction. Based on this, Figure 1 In the view shown, the top and bottom sides of the paper are the up and down directions, the left and right sides are the left and right directions, and the front and back sides are the front and back directions.

[0036] like Figure 3 As shown, the hollow support frame 130 is a hollow square frame with open front and rear, which is formed by a top plate 132, a bottom plate 133 and two side plates 131.

[0037] like Figure 1 and Figure 3 As shown, the lifting device includes a lifting frame 140, a drive screw 150, and a first nut 151 and a second nut 152 threaded onto the drive screw 150. The drive screw 150 is horizontally rotatably mounted on two side plates 131 of the hollow support frame 130 via bearings, with one end of the drive screw 150 located outside the hollow support frame 130 for easy connection with automatic bolt tightening tools such as electric wrenches. The lifting frame 140 is located inside the hollow support frame 130, with both top ends of the lifting frame 140 connected to the bottom of the keel support member 120, and both bottom ends of the lifting frame 140 rotatably connected to the first nut 151 and the second nut 152, respectively. When the drive screw 150 rotates forward or backward, the lifting frame 140 can extend or retract vertically to drive the keel support member 120 to slide vertically, thereby adjusting the height of the keel support member 120.

[0038] Since the drive screw 150 of this utility model can be connected with automatic bolt tightening tools such as electric wrenches to realize the automatic tightening of the drive screw 150, the tightening intensity of the drive screw 150 is effectively reduced and the tightening efficiency is improved, and the height adjustment difficulty of the keel support 120 is reduced.

[0039] It should be noted that the structural form of the lifting frame 140 in the above-mentioned lifting device is closely related to the structural form of the drive screw 150. Based on this, the lifting frame 140 includes, but is not limited to, the following embodiments, as long as the lifting frame 140 can be driven to extend or retract in the vertical direction by the drive screw 150.

[0040] Example 1 of Lifting Frame 140:

[0041] like Figure 1 As shown, the drive screw 150 is a bidirectional screw, and the first nut 151 and the second nut 152 are threaded onto the threaded sections of the bidirectional screw with different directions of rotation, so that when the bidirectional screw rotates forward or backward, the first nut 151 and the second nut 152 can move closer or further away synchronously.

[0042] At this time, as Figure 1 As shown, the lifting frame 140 includes a first connecting rod 141 and a second connecting rod 142 symmetrically arranged in the left-right direction; wherein, the top ends of the first connecting rod 141 and the second connecting rod 142 are hinged to the bottom of the keel support member 120; the bottom ends of the first connecting rod 141 and the second connecting rod 142 are respectively hinged to the first nut 151 and the second nut 152; thus, when the first nut 151 and the second nut 152 move closer or further away simultaneously, the tilt angle of the first connecting rod 141 and the second connecting rod 142 will change, causing the lifting frame 140 formed by the first connecting rod 141 and the second connecting rod 142 to extend or retract in the vertical direction, thereby realizing the adjustment of the height of the keel support member 120.

[0043] It should be noted that the first link 141 and the second link 142 can be arranged in either a regular V-shape or an inverted V-shape. There is no limitation on this, as long as the height position of the keel support 120 can be changed when the bottom ends of the two links are close to or far apart.

[0044] To reduce the stress at the hinge joints of each link, a horizontal slide rail (not shown in the figure) parallel to the drive screw 150 can be provided on the bottom plate 133 of the hollow support frame 130, and the first nut 151 and the second nut 152 are slidably connected to the horizontal slide rail.

[0045] Example 2 of Lifting Frame 140:

[0046] like Figure 4 As shown, the drive screw 150 is a bidirectional screw, and the first nut 151 and the second nut 152 are threaded onto the threaded sections of the bidirectional screw with different directions of rotation, so that when the bidirectional screw rotates forward or backward, the first nut 151 and the second nut 152 can move closer or further away synchronously.

[0047] At this time, as Figure 4As shown, the lifting frame 140 is a scissor lift, which includes a first connecting rod 141 and a second connecting rod 142 arranged in a cross configuration, and the middle parts of the first connecting rod 141 and the second connecting rod 142 are connected by a pivot. The bottom of the keel support 120 is provided with a horizontal slide rail 180 parallel to the drive screw 150, and a first slider 181 and a second slider 182 are slidably arranged on the horizontal slide rail 180. In the scissor lift 140, the top ends of the first connecting rod 141 and the second connecting rod 142 are respectively connected to the first slider 181. 1. The first and second sliders 182 are hinged together, and the bottom ends of the first and second connecting rods 141 and 142 are respectively hinged to the first nut 151 and the second nut 152. Thus, when the first nut 151 and the second nut 152 move closer or further away at the same time, the cross angle of the first connecting rod 141 and the second connecting rod 142 will change, so that the lifting frame 140 formed by the first connecting rod 141 and the second connecting rod 142 extends or retracts in the vertical direction, thereby realizing the adjustment of the height of the keel support 120.

[0048] Example 3 of Lifting Frame 140:

[0049] like Figure 5 As shown, the drive screw 150 is a one-way screw, and the first nut 151 and the second nut 152 are threaded onto the one-way screw so that when the one-way screw rotates forward or backward, the first nut 151 and the second nut 152 can move synchronously in the same direction.

[0050] At this time, as Figure 5 As shown, the lifting frame 140 includes a first connecting rod 141 and a second connecting rod 142 arranged in parallel. The top ends of the first connecting rod 141 and the second connecting rod 142 are hinged to the keel support member 120, and the bottom ends of the first connecting rod 141 and the second connecting rod 142 are respectively hinged to the first nut 151 and the second nut 152. Thus, the first connecting rod 141, the second connecting rod 142, the first nut 151, the second nut 152 and the keel support member 120 can form a parallelogram lifting frame. When the first nut 151 and the second nut 152 move synchronously in the same direction, the tilt angle of the first connecting rod 141 and the second connecting rod 142 will change, thereby realizing the adjustment of the height of the keel support member 120.

[0051] In one optional embodiment, there is one set of lifting devices. To improve the lifting stability of the keel support 120, the set of lifting devices may be provided with two lifting frames 140, and the two lifting frames 140 are symmetrically arranged on the front and rear sides of the first nut 151 and the second nut 152.

[0052] In one alternative embodiment, there are multiple sets of lifting devices. To reduce structural complexity and adjustment difficulty, such as... Figure 3As shown, there are preferably two sets of lifting devices, and the two sets of lifting devices are arranged at intervals below the keel support 120; at this time, the synchronous screwing of multiple drive screws 150 can be achieved by means of a multi-axis tightening system.

[0053] To ensure the sliding stability of the keel support component 120. For example... Figure 1 and Figure 3 As shown, a plurality of vertical slide rods 160 are provided inside the hollow support frame 130, and the keel support member 120 is slidably mounted on the vertical slide rods 160. In this embodiment, there are four vertical slide rods 160, which are distributed at the four corners of the keel support member 120.

[0054] It is understood that, in this application, the height adjustment device between the main pole 110 and the upright pole 210 includes, but is not limited to, the following implementation methods, as long as the height adjustment of the main pole 110 can be achieved.

[0055] Implementation method one of the height adjustment device:

[0056] like Figure 6 As shown, the main rod 110 is a lead screw, and the height adjustment device includes an adjusting nut 171 threaded onto the lead screw. During installation, the lower end of the lead screw is inserted into the upright 210 of the scaffold 200, and the adjusting nut 171 is supported on the top of the upright 210. The insertion depth of the lead screw is controlled by adjusting the nut 171, thereby achieving the purpose of adjusting the height position of the lead screw.

[0057] Implementation method two for the height adjustment device:

[0058] like Figure 7 As shown, the height adjustment device includes an adjustment cylinder 172, wherein the adjustment cylinder 172 is threadedly connected to the upright 210, and the lower end of the main rod 110 is rotatably supported inside the adjustment cylinder 172; since the adjustment cylinder 172 is threadedly connected to the upright 210, when the adjustment cylinder 172 rotates, it can move up and down relative to the upright 210, thereby driving the main rod 110 to move up and down.

[0059] like Figure 8 and Figure 9 As shown, this utility model also provides an early-stripping support system, which includes a scaffold 200 and the aforementioned early-stripping top support 100. In this embodiment, the scaffold 200 is a disc-lock type scaffold.

[0060] For ease of understanding, the following combination Figure 1 , Figure 6 , Figure 8 and Figure 9 The working process of the early dismantling support system is explained.

[0061] When concrete pouring is required, such as Figure 1 , Figure 6 and Figure 8 As shown, the early-stripping top supports 100 must first be installed on the scaffolding 200 to form an early-stripping support system; then, the installation height of each early-stripping top support 100 is adjusted by turning the adjusting nut 171 until the height of each hollow support frame 130 meets the construction requirements; then, as... Figure 8 and Figure 9 As shown, the main keel 410 is inserted into the hollow support frame 130 and placed on the keel support member 120; then, the secondary keel 420 is placed above the main keel 410 and arranged perpendicular to the main keel 410; next, the template 300 is placed on top of the hollow support frame 130; finally, the drive screws 150 of each early removal top support 100 are adjusted one by one to move the keel support member 120 upward until all secondary keels 420 are in contact with and parallel to the template 300, thus completing the preparation work before concrete pouring.

[0062] Concrete is poured onto formwork 300 to form a concrete structure. When the concrete structure strength reaches the specification requirements (generally 70%), the drive screws 150 of the early-stripping top support 100 are adjusted one by one to lower the keel support 120. The main keel 410 and secondary keel 420 will move down under their own weight to facilitate the removal of each keel. At this time, the concrete structure is supported by the hollow support frame 130 of the early-stripping top support 100. When the concrete structure strength reaches 100%, the adjusting nut 171 is tightened to lower the hollow support frame 130, completing the removal of the early-stripping top support 100 and scaffolding 200.

[0063] It should be noted that the main keel 410 is supported by two to three early-stripping top supports 100 spaced at intervals, and the height change during each adjustment of the keel support 120 does not exceed 5mm. Therefore, even if the main keel 410 tilts during the adjustment process, its tilt angle is relatively small, which meets the construction requirements of the early-stripping support system.

[0064] In summary, this application optimizes the height adjustment structure of the keel support 120 from a nut threaded onto the main rod 110 to a scheme where a horizontally positioned drive screw 150 drives the lifting frame 140 to extend or retract vertically. This allows the adjustment screw 150 to interface with automatic bolt tightening tools such as electric wrenches, enabling automatic tightening of the adjustment screw 150. This effectively reduces the difficulty and labor intensity of height adjustment of the keel support 120, and improves adjustment efficiency. This utility model effectively overcomes the various shortcomings of the prior art and has high industrial applicability.

[0065] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. An early-stripping scaffold support, comprising a main pole (110) and a keel support (120), wherein the main pole (110) is mounted on the uprights (210) of a scaffold (200) via a height adjustment device; characterized in that, The top of the main rod (110) is fixed with a hollow support frame (130), which is used to support the template (300); the keel support member (120) is vertically slidably installed in the hollow support frame (130), and the hollow support frame (130) is provided with a lifting device for adjusting the height of the keel support member; The lifting device includes a lifting frame (140), a drive screw (150), a first nut (151) and a second nut (152) threaded onto the drive screw (150); the lifting frame (140) is located inside the hollow support frame (130), and both ends of the top of the lifting frame (140) are connected to the bottom of the keel support member (120), and both ends of the bottom of the lifting frame (140) are connected to the first nut (151) and the second nut (152) respectively; the drive screw (150) is horizontally rotatably mounted on the hollow support frame (130), and one end of the drive screw (150) is located outside the hollow support frame (130); the drive screw (150) is used to drive the lifting frame (140) to extend or retract in the vertical direction, so as to drive the keel support member (120) to slide vertically.

2. The early removal support according to claim 1, characterized in that, The drive screw (150) is a bidirectional screw, and the first nut (151) and the second nut (152) are threaded onto the threaded sections of the bidirectional screw with different directions of rotation.

3. The early removal support according to claim 1, characterized in that, The drive screw (150) is a unidirectional screw.

4. The early removal support according to claim 2, characterized in that, The lifting frame (140) includes a first connecting rod (141) and a second connecting rod (142) arranged symmetrically; the top ends of the first connecting rod (141) and the second connecting rod (142) are both hinged to the bottom of the keel support (120); the bottom ends of the first connecting rod (141) and the second connecting rod (142) are respectively hinged to the first nut (151) and the second nut (152).

5. The early removal support according to claim 2, characterized in that, The lifting frame (140) is a scissor lift; the bottom of the keel support (120) is slidably provided with a first slider (181) and a second slider (182), and the sliding direction of each slider is parallel to the axial direction of the bidirectional screw; the top two ends of the scissor lift are respectively hinged to the first slider (181) and the second slider (182).

6. The early removal support according to claim 3, characterized in that, The lifting frame (140) includes a first connecting rod (141) and a second connecting rod (142) arranged in parallel; the top ends of the first connecting rod (141) and the second connecting rod (142) are both hinged to the bottom of the keel support (120); the bottom ends of the first connecting rod (141) and the second connecting rod (142) are respectively hinged to the first nut (151) and the second nut (152).

7. A pre-extraction support according to any one of claims 1 to 6, characterized in that, The lifting device consists of two sets, and the two sets of lifting devices are spaced apart below the keel support (120).

8. A pre-extraction support according to any one of claims 1 to 6, characterized in that, The hollow support frame (130) is provided with a plurality of vertical slide rods (160), and the keel support (120) is slidably installed on the vertical slide rods (160).

9. The early removal support according to claim 1, characterized in that, The main rod (110) is a lead screw; the height adjustment device includes an adjusting nut (171) threaded onto the lead screw; the lower end of the lead screw is inserted into the upright (210) of the scaffold (200), and the adjusting nut (171) is supported on the top of the upright (210).

10. An early-tear support system, characterized in that, Includes scaffolding (200) and early-stripping support (100) as described in any one of claims 1 to 9.

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