Scaffolding anti-falling device for attached scaffolding

Abstract

The present invention discloses a scaffolding anti-falling device for an attached scaffolding, the attached scaffolding comprises a plurality of round steel crosspieces 2 arranged with equal height differences, the anti-falling device comprises a support that can be fixed on a building, the support is provided with a horizontal anti-falling baffle 10 and a limiting mechanism for limiting the horizontal movement of the baffle, a first reset spring 8 is connected between the end of the horizontal anti-falling baffle 10 and the support; it also comprises a rotating shaft and an angled plate fixed on the support, the angled plate comprises a first support plate 5 and a second support plate 6, a rotating sleeve 11 sleeved on the rotating shaft is arranged at the vertex of the angled plate, a connecting arm 12 is arranged on the outer wall of the rotating sleeve 11, a second reset spring 13 is connected between the support and the connecting arm 12; a push plate 7 is fixedly connected below the horizontal anti-falling baffle 10. The present invention has a simple and practical structure, is safe and reliable, has a good anti-falling effect, and effectively solves the anti-falling problem of the attached scaffolding.

Description

Technical Field

[0001] The invention belongs to the field of construction, and in particular relates to a scaffold anti-falling device for an attached scaffold. Background Art

[0002] At present, the limitations of traditional steel pipe scaffolding in high-rise buildings are becoming increasingly serious, and the advantages of attached scaffolding are emerging. Compared with traditional scaffolding, the main advantages are: 1. Good economical use: the use of attached scaffolding only requires 4-5 layers of frame materials, and it can be built in one go, with low material loss, saving labor costs and tower crane usage costs; 2. High installation efficiency: avoiding the continuous construction of traditional scaffolding at high altitudes. After the attached scaffolding is built, the frame is in a fully sealed state, avoiding the high-altitude fall of building materials and the fall of operators during the transportation of building materials; 3. High efficiency: when the frame is normally lifted and lowered, the lifting time of each layer is short, saving the working time of the scaffolding workers, and it is also easy to meet the time requirements of the single-layer construction of the main structure.

[0003] In order to effectively prevent the frame from falling, an anti-falling device must be installed in the scaffold. Due to structural design reasons, the existing attached scaffold has an unsatisfactory braking effect or does not have an anti-falling effect when the frame descends. Summary of the invention

[0004] In order to overcome the technical defects in the prior art, the present invention discloses a scaffold anti-falling device for an attached scaffold.

[0005] The scaffolding anti-falling device for an attached scaffolding of the present invention comprises a plurality of round steel crosspieces arranged on a vertical support column with equal height differences, the anti-falling device comprises a support that can be fixed on a building, the support is provided with a horizontal anti-falling baffle and a limiting mechanism for limiting the horizontal movement of the baffle, and a first return spring is connected between the end of the horizontal anti-falling baffle and the support

[0006] It also includes a rotating shaft and an angled plate fixed on the support, the angled plate includes a first support plate and a second support plate, a rotating sleeve sleeved on the rotating shaft is arranged at the vertex of the angled plate, a connecting arm is arranged on the outer wall of the rotating sleeve, and a second return spring is connected between the support and the connecting arm;

[0007] A push plate is fixedly connected below the horizontal anti-fall baffle;

[0008] In the scaffold anti-falling device, when the second support plate of the angled plate pushes the push plate to reach the maximum distance, the upper surface of the anti-falling baffle plate has a reset height difference H from the round steel cross bar above it, and the reset height difference H satisfies:

[0009] H / V1 is much larger than T0. T0 is the reset time of the first reset spring after the second support plate of the angled plate pushes the push plate to the maximum distance. V1 is the normal descending speed of the scaffold.

[0010] And H / V2 is much smaller than T0, V2 is the average falling speed of the scaffolding when it is out of control.

[0011] Preferably, the limiting mechanism comprises a limiting plate located above the horizontal anti-fall baffle and a supporting rod located below the horizontal anti-fall baffle, and the supporting rod and the limiting plate are both fixed on a support.

[0012] Preferably, a groove is provided on the upper surface of the free end of the anti-fall baffle.

[0013] Preferably, the limiting mechanism comprises a guide screw fixed on a support.

[0014] Preferably, the connection point between the second return spring and the support is located below the rotating shaft.

[0015] Preferably: the anti-falling device includes a building plate and a pair of side guard plates perpendicular to the building plate, and a horizontal plate located above the side guard plates, the horizontal anti-falling baffle, the limiting mechanism, the rotating shaft and the angle plate are all located in the space surrounded by the side guard plates, the building plate and the horizontal plate, and a half-embracing hole is respectively provided on both sides of the horizontal plate away from the side of the building plate.

[0016] The invention has a simple and practical structure, is safe and reliable, has a good anti-falling effect, and effectively solves the anti-falling problem of the attached scaffolding. The anti-falling device can install all the anti-falling components inside the support, and relies on the peripheral structure of the support to effectively protect the anti-falling device, preventing the anti-falling device from being collided and contaminated by construction waste such as concrete, causing the anti-falling device to be stuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a specific implementation of the scaffold anti-falling device of the present invention;

[0018] Figure 2 It is a schematic diagram of a specific movement mode of the scaffold anti-falling device of the present invention in the ascending state;

[0019] Figure 3 It is a schematic diagram of a specific movement mode of the scaffold anti-falling device of the present invention in a normal descending state;

[0020] Figure 4 It is a schematic diagram of a specific movement mode of the scaffold anti-falling device of the present invention in an abnormal falling state;

[0021] Figure 5 It is a schematic diagram of a specific implementation of the external structure of the scaffold anti-falling device of the present invention;

[0022] Figure numerals: 1-vertical support column, 2-round steel cross bar, 3-building plate, 4-limiting plate, 5-first support plate, 6-second support plate, 7-push plate, 8-first return spring, 9-support rod, 10-horizontal anti-fall baffle, 11-rotating sleeve, 12-connecting arm, 13-second return spring, 14-connecting point, 15-groove, 16-side guard plate, 17-half holding hole, 18-horizontal plate. DETAILED DESCRIPTION

[0023] The following is a more detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and the accompanying drawings so that a person skilled in the art can implement the embodiments after reading the description. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] In the description of the present invention, it should be noted that the terms "upper", "horizontal", "inner", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The scaffolding anti-falling device for an attached scaffolding of the present invention comprises a support that can be fixed on a building, the support is provided with a horizontal anti-falling baffle 10 and a limiting mechanism for limiting the horizontal movement of the baffle, and a first return spring 8 is connected between the end of the horizontal anti-falling baffle 10 and the support.

[0027] It also includes a rotating shaft and an angled plate fixed on the support, the angled plate includes a first support plate 5 and a second support plate 6, a rotating sleeve 11 sleeved on the rotating shaft is arranged at the vertex of the angled plate, a connecting arm 12 is arranged on the outer wall of the rotating sleeve 11, and a second return spring 13 is connected between the support and the connecting arm 12;

[0028] A vertical push plate 7 is fixedly connected below the horizontal anti-fall baffle 10;

[0029] In the scaffold anti-falling device, when the second support plate 6 of the angled plate pushes the push plate 7 to reach the maximum distance, the upper surface of the anti-falling baffle plate has a reset height difference H from the round steel cross bar above it, and the reset height difference H satisfies:

[0030] H / V1 is much larger than T0. T0 is the reset time of the first reset spring 8 when the second support plate 6 of the angled plate pushes the push plate 7 to reach the maximum distance. V1 is the normal descending speed of the scaffold.

[0031] And H / V2 is much smaller than T0, V2 is the average falling speed of the scaffolding when it is out of control.

[0032] like Figure 1 As shown, the present invention is applicable to an attached scaffolding provided with a plurality of parallel round steel cross bars according to national standards, the fixing surface of the anti-falling device is fixed on the outer facade of the building, and the basic principle of anti-falling is that when it is detected that the scaffolding is falling rapidly at an abnormal speed, the scaffolding is fixed to the anti-falling device through the round steel cross bars.

[0033] by Figure 1 The specific implementation manner shown is used as an example to illustrate the specific working principle of the present invention as follows.

[0034] Under normal conditions, the scaffolding fixes its height by itself and is set up near the building in accordance with engineering construction standards, generally 450 mm away from the building's facade. The first support plate 5 of the angled plate of the anti-fall device is in a roughly horizontal state and is fixed by a round steel cross bar. The second support plate 6 is in a roughly vertical state and is fixed to the right side of the push plate 7 under the anti-fall baffle. At this time, the first return spring 8 is basically in a natural elongation state, and the second return spring 13 is also basically in a natural elongation state or has a small tensile deformation, so that the tension generated by the tensile deformation of the second support plate 6 in the vertical state has a certain counterclockwise rotation tendency and is close to the push plate 7.

[0035] When the attached scaffolding is rising normally, when the lower edge of the first support plate 5 is blocked by another round steel horizontal block located below the first support plate 5 in the normal state, it naturally moves clockwise along the rotation axis, such as Figure 2 As shown, the angled plate moves clockwise, and the connecting arm 12 connected to the first return spring 8 moves away, causing the first return spring 8 to be stretched; at the same time, the second support plate 6 moves away from the push plate 7, and the push plate 7 does not move without force; when the first support plate 5 rotates beyond a certain angle, the round steel cross bar passes over the first support plate 5, and the first support plate 5 loses the support of the round steel cross bar and is stretched and reset by the first return spring 8 to return to Figure 1 The above process is repeated, and during the ascent of the scaffold, only the angled plate of the entire anti-fall device rotates and turns back periodically, and other components do not move.

[0036] When the attached scaffolding descends at a uniform speed according to the construction operation procedures, usually at a speed of 2 mm per second or a similar speed, when the upper edge of the first support plate 5 is blocked by another round steel horizontal block located above the first support plate 5 in the normal state, it naturally moves counterclockwise along the rotation axis, such as Figure 3 As shown, the counterclockwise movement of the second support plate 6 causes the second support plate 6 to push the push plate 7, and the push plate 7 drives the anti-fall baffle to move horizontally to the left and move to below the positive projection of the round steel cross bar. At this time, the first return spring 8 is stretched due to the movement of the anti-fall baffle, and the second return spring 13 is also in a stretched state due to the distance of the connecting arm 12.

[0037] Under the state of uniform descent, the anti-fall baffle should not block the normal descent of the scaffolding; by setting the length of the push plate 7, comprehensively considering factors such as the rising speed of the scaffolding, the vertical spacing between the round steel cross bars, and the horizontal displacement of the end of the second support plate 6, after experimental verification, the height position of the horizontal anti-fall baffle 10 can be set so that when the end of the first support plate 5 rotates to the surface part of the round steel cross bar closest to the rotating shaft, that is, this is the critical point when the first support plate 5 disengages from the round steel cross bar, the upper surface of the anti-fall baffle still has a reset height difference H from the round steel cross bar above it. Once the first support plate 5 disengages from the round steel cross bar, the entire angled plate is quickly reset by the second reset spring 13, and the second support plate 6 originally leaning on the push plate 7 is separated from the push plate 7. After losing the thrust of the second support plate 6, the push plate 7 is pulled back horizontally under the action of the first reset spring 8.

[0038] When the first support plate 5 breaks away from the critical point of contact with the round steel cross block, the scaffolding still needs time H / V1 before it is blocked by the anti-fall baffle, where V1 is the descent speed of the scaffolding during normal descent. According to construction requirements, the descent speed of the scaffolding is generally several millimeters per second. According to common sense, the reset time T0 required for the first reset spring 8 to drag the anti-fall baffle back is within ten seconds or even shorter. The reset height difference H can usually be set to centimeters, such as 7 centimeters, then H / V1=35 seconds, which is enough for the anti-fall baffle to be pulled back to its original position by the first reset spring 8 before being blocked by the round steel cross block.

[0039] In an abnormal falling state, the falling speed of the scaffold is much greater than the normal falling speed, H / V2 is much less than T0, and V2 is the average falling speed of the scaffold in an out-of-control state; It should be noted that the scaffold may be in accelerated motion in an out-of-control state, but the overall average falling speed is usually much greater than the normal falling speed. Assuming that the time required for the spring to drag the anti-fall baffle back is 1 second, and the reset height difference H is set to 7 cm, according to common sense, in free fall, the movement distance in the first second reaches 5 meters, which is much greater than the reset height difference of 7 cm. It can be seen that the reset height difference is short enough during free fall, enough to block the anti-fall baffle by the round steel cross bar before the anti-fall baffle is pulled back to achieve anti-fall.

[0040] A more precise discussion of the calculation process is as follows:

[0041] When the scaffolding is in free fall, the reset height difference H between the anti-fall baffle and the round steel cross bar can be calculated to obtain the time for the two to collide and jam the frame, that is, the time T required for the fall to reset the height difference H. Free fall usually occurs during normal descent operation.

[0042] H=V 0 *T+1 / 2GT 2

[0043] Where V 0 ——The initial speed of the frame movement is assumed to be 2 mm / s,

[0044] G is the acceleration due to gravity, G=9.8m / s 2

[0045] From this we can deduce that the time T = 0.02 seconds,

[0046] Assume that the falling speed is affected by the friction of surrounding obstacles and is reduced to V 0 =2 meters per second, which is still much faster than the safe operating speed, so we can calculate T=H / V 0 = 0.035 seconds.

[0047] When the frame falls, the push plate 7 drives the anti-fall baffle to move forward, and the stretching length of the first return spring 8 is L; the pull-back force F=K*L in the initial state, K is the spring stiffness coefficient; in the entire pull-back process, a margin is made to assume that the pull-back force does not decrease as the spring deformation becomes smaller, but remains unchanged, the friction force is 0.2 times the gravity, and the pull-back process is a uniformly accelerated motion. It is assumed that the pull-back safety distance of the anti-fall baffle is L1=0.2L, that is, within this safety distance, the round steel cross bar will be blocked by the anti-fall baffle.

[0048] L1=1 / 2a*T 0 2

[0049] a=(F-0.2MG) / M,

[0050] F=K*L

[0051] Take K=60, M=2 kg, L=0.1 m,

[0052] By calculation, we can get that T 0 =0.45s

[0053] T 0 =0.45s satisfies the reset time T 0It is much longer than the time T required for the fall reset height difference H when falling abnormally. That is, after the fall reset height difference H, the first reset spring 8 is far from being reset, which is enough to make the anti-fall baffle blocked by the round steel crosspiece 2. Once blocked by the round steel crosspiece 2, the scaffolding's own gravity is completely supported by the anti-fall baffle, and the anti-fall baffle is subjected to strong friction. The pull-back force generated by the first reset spring 8 is not enough to continue to drag the anti-fall baffle and fix the position to achieve anti-fall. A groove 15 can be set at the end of the anti-fall baffle so that the round steel crosspiece 2 falls into the groove 15 and gets stuck when falling, which is more firm.

[0054] Although theoretically as long as H / V1 is less than T0 or H / V1 is greater than T0, for the sake of engineering safety and various parameters on site such as the spacing between the round steel crosspieces, the spring elastic modulus, installation errors and other factors, actual measurements require calculation results that are much larger or much smaller than the actual value, that is, the difference must be at least 10 times or more.

[0055] The function of the limit mechanism is to limit the movement direction of the anti-fall baffle so that it moves in the horizontal direction as much as possible. Figure 1 and Figure 5 In the specific embodiment shown, the limiting mechanism includes a limiting plate 4 located above the horizontal anti-fall baffle 10 and a support rod 9 located below the horizontal anti-fall baffle 10, the support rod 9 and the limiting plate 4 are both fixed on the support, and the upper and lower parts of the horizontal anti-fall baffle 10 are respectively limited by the limiting plate 4 and the support rod 9 with larger areas to achieve horizontal movement, and the support rod 9 also plays a supporting role for the anti-fall baffle. The end of the support rod 9 is generally arc-shaped to minimize friction as much as possible. The limiting plate 4 itself is fixed on the support and does not rely on the anti-fall baffle for support. It is also to only play a limiting role and minimize the resistance encountered by the anti-fall baffle during movement; a guide screw can also be arranged on the support, and the first return spring 8 is sleeved on the guide screw to guide the thrust of the first return spring 8 to avoid oblique extension and contraction of the spring.

[0056] Figure 5 A schematic diagram of peripheral components of a specific implementation of the anti-falling device is given, the anti-falling device includes a building plate 3 and a pair of side guard plates 16 perpendicular to the building plate 3, and a horizontal plate located above the side guard plates 16, the horizontal anti-falling baffle 10, the limiting mechanism, the rotating shaft and the angled plate are all located in a space surrounded by the side guard plates 16, the building plate 3 and the horizontal plate, and a half-holding hole 17 is respectively provided on both sides of the horizontal plate away from the side of the building plate 3 for the vertical support column 1 of the scaffold to pass through; the function of the building plate 3 is to fix the anti-falling device on the outer facade of the building by using the fixing devices on the plate, such as bolt holes, etc., the specific anti-falling structure is arranged in a semi-enclosed structure below the limiting plate 4, which can prevent the anti-falling device from being contaminated by construction waste and the like and affecting the performance of each spring and the rotating shaft.

[0057] The invention has a simple and practical structure, is safe and reliable, has a good anti-falling effect, and effectively solves the anti-falling problem of the attached scaffolding. The anti-falling device can install all the anti-falling components inside the support, and relies on the peripheral structure of the support to effectively protect the anti-falling device, preventing the anti-falling device from being collided and contaminated by construction waste such as concrete, causing the anti-falling device to be stuck.

[0058] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific embodiments of the present invention are limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, other embodiments obtained without departing from the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A scaffolding anti-falling device for an attached scaffolding, the attached scaffolding comprising a plurality of round steel crosspieces (2) arranged at equal height differences on a vertical support column (1), the anti-falling device comprising a support that can be fixed on a building, characterized in that: The support is provided with a horizontal anti-falling baffle (10) and a limiting mechanism for limiting horizontal movement of the baffle, and a first return spring (8) is connected between the end of the horizontal anti-falling baffle (10) and the support; It also includes a rotating shaft and an angled plate fixed on the support, the angled plate including a first support plate (5) and a second support plate (6), a rotating sleeve (11) sleeved on the rotating shaft is arranged at the vertex of the angled plate, a connecting arm (12) is arranged on the outer wall of the rotating sleeve (11), and a second return spring (13) is connected between the support and the connecting arm; A push plate (7) is fixedly connected below the horizontal anti-fall baffle (10); In the scaffold anti-falling device, when the second support plate (6) of the angled plate pushes the push plate (7) to reach a maximum distance, the upper surface of the anti-falling baffle plate has a reset height difference H from the round steel cross bar above it, and the reset height difference H satisfies: H / V1 is much larger than T0. T0 is the reset time of the first reset spring after the second support plate of the angled plate pushes the push plate to the maximum distance. V1 is the normal descending speed of the scaffold. And H / V2 is much smaller than T0, V2 is the average falling speed of the scaffold when it is out of control; The limiting mechanism comprises a limiting plate (4) located above the horizontal anti-fall baffle (10) and a support rod (9) located below the horizontal anti-fall baffle (10), wherein the support rod and the limiting plate are both fixed on a support. The upper surface of the free end of the anti-fall baffle is provided with a groove (15); The far greater than and far less than index values ​​differ by more than 10 times.

2. The scaffolding anti-falling device according to claim 1, characterized in that: The limiting mechanism comprises a guide screw fixed on a support.

3. The scaffolding anti-falling device according to claim 1, characterized in that: The connection point between the second return spring (13) and the support is located below the rotating shaft.

4. The scaffold anti-falling device according to claim 1, characterized in that: The anti-falling device comprises a building plate and a pair of side guard plates (16) perpendicular to the building plate (3), and a horizontal plate located above the side guard plates (16); the horizontal anti-falling baffle plate (10), the limiting mechanism, the rotating shaft and the angled plate are all located in a space surrounded by the side guard plates (16), the building plate and the horizontal plate; and a half-holding hole (17) is respectively provided on both sides of the horizontal plate away from the building plate (3).

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