A guardrail and an aerial work platform using the guardrail

Abstract

The present invention belongs to the field of safety protection, and specifically relates to a guardrail, and an aerial work platform using the guardrail. The guardrail includes: a base, a column, a crossbeam, and a connecting sleeve. The present invention also includes an aerial work platform using the guardrail, the aerial work platform includes a platform bottom beam, and the platform bottom beam includes a positioning sleeve. A whole-piece guardrail in the prior art is limited to a manhole door size of about 500mm in diameter in a confined space. When the guardrail component is transported through the manhole door, the width of the whole piece size of the component cannot exceed 500mm. The specifications and dimensions of this guardrail are suitable for small temporary aerial work platforms. The guardrail component of the present invention adopts a single-component assembly type, which is not limited by the diameter of the manhole door and can be well matched with various small, medium and large temporary aerial work platforms built in confined spaces.

Description

Technical Field

[0001] The invention belongs to the field of safety protection, and in particular relates to a guardrail and an aerial work platform using the guardrail. Background Art

[0002] At present, the guardrails of aerial work platforms temporarily built in confined spaces for frequent installation and disassembly, especially the boiler furnace maintenance lifting platforms in thermal power plants, are usually built with scaffolding steel pipes. Since the manhole doors for entering and exiting the confined space are generally about 500mm in diameter, the entire large guardrail cannot enter and exit the manhole doors of the confined space due to the small diameter of the manhole door. The construction process uses many steel pipe clips, and the workload of tightening the bolts when installing the guardrail is large. In addition, the guardrail pipe diameter is thick and the weight is heavy, which is particularly unsuitable for transportation and rapid assembly.

[0003] When installing the maintenance lifting platform for the boiler furnace of a thermal power plant, it is limited by the load capacity of the maintenance lifting platform, and it is necessary to reduce the deadweight of the maintenance lifting platform. At the same time, due to the limitation of installation time, it is also necessary to realize the rapid assembly and disassembly of the maintenance lifting platform. At present, there are platform guardrails built vertically and horizontally with construction steel pipes. This process is an old construction method, which is labor-intensive and time-consuming, has great safety hazards, and is not neat after installation. On the other hand, due to the upper and lower connection of the steel pipe buckle, the steel pipe buckle bolts and the horizontal and vertical guardrail steel pipes are protruding, which is easy to scratch clothes and safety belts, which is not conducive to the furnace maintenance workers clinging to the guardrail to carry out the furnace water-cooled wall construction. Summary of the invention

[0004] The embodiment of the present application provides a guardrail that reduces its own weight and has a unified installation size standard, thereby solving the problem in the prior art of using building steel pipe buckles to connect the upper and lower parts, resulting in protrusions on the steel pipe buckle bolts and the guardrail steel pipes in the horizontal and vertical directions, which are easy to scratch clothes and safety belts. It is necessary to achieve the technical effects of beautiful appearance, safety and firmness after installation, and quick assembly and convenient disassembly.

[0005] The present application embodiment discloses a guardrail, comprising:

[0006] The base comprises a bottom plate, a base positioning pin, a locking hanging plate assembly and a wedge iron, wherein: the bottom plate is provided with a positioning pin hole and a wedge iron placement groove; the base positioning pin is installed in the positioning pin hole; the locking hanging plate assembly is provided with a hanging plate, two shaft ears, a hanging plate shaft and a travel guide block, the hanging plate comprises a vertical plate and a baffle plate which forms a certain angle with the vertical plate, the hanging plate shaft is installed at the upper end of the vertical plate, the shaft ears are fixed on both sides of the long side of the bottom plate, the hanging plate shaft is installed between the shaft ears, and the travel guide block is arranged on the outer side of the vertical plate;

[0007] A column, the column comprising a support hook provided with a groove and a column body provided with a first arc-shaped groove, the support hook is fixed on the left and right sides of the column body, and the column is connected to the base;

[0008] A crossbeam, wherein the crossbeam comprises an ear plate provided with a second arc-shaped groove and a crossbeam body, wherein the crossbeam is connected to the support hook via the ear plate; and

[0009] A connecting sleeve connects the crossbeam body.

[0010] Furthermore, the embodiment of the present application discloses that the shapes and dimensions of the groove, the first arc-shaped groove and the second arc-shaped groove are consistent with the shapes and dimensions of the outer edge of the beam body.

[0011] Furthermore, the embodiments of the present application disclose that the vertical force borne by the lower end of the wedge is smaller than the friction force that needs to be overcome by the wedge in its upward movement.

[0012] The embodiment of the present application also discloses an aerial work platform, which includes a plurality of the aforementioned guardrails and a platform bottom beam, wherein the platform bottom beam includes a positioning sleeve.

[0013] Furthermore, the embodiment of the present application discloses that the spacing distance between the ear plates on the cross beam body is equal to the center distance between the two columns after being installed on the platform bottom beam.

[0014] Furthermore, the embodiment of the present application discloses that the inner diameter of the positioning sleeve matches the installation clearance of the base positioning pin.

[0015] Furthermore, the embodiment of the present application discloses that the length of the base locating pin is less than or equal to the vertical height of the main limb of the platform bottom beam.

[0016] Furthermore, the embodiment of the present application discloses that the height of the vertical plate is equal to the vertical height of the main limb of the platform bottom beam.

[0017] Furthermore, the embodiment of the present application discloses that the wedge iron placement groove is provided with a narrow side of the placement groove, the distance between the center of the positioning pin hole and the narrow side of the placement groove on the adjacent side is L1, the distance from the center of the positioning sleeve to the outer end of the main limb of the platform bottom beam is L2, the thickness of the vertical plate is L3, L1=L2+L3, the length of the baffle is L4, and L4≧L2+L3.

[0018] Furthermore, the embodiment of the present application discloses that the outer end protruding portion of the main limb of the platform bottom beam is used to install the base, and the length of the outer end protruding portion of the main limb is L5, and L5>L2.

[0019] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects:

[0020] 1. The guardrail column installation base enhances the overall stability of the assembled guardrail, thereby improving the safety of the aerial work platform;

[0021] 2. The present invention ensures that the length numerical relationship of L1, L4, and L5 is correct, which is conducive to inserting and locking the hanging plate assembly to leave a suitable assembly gap. When the wedge is inserted into the wedge placement groove and plugged in, the baffle is in close contact with the lower side of the outer end of the main limb of the platform bottom beam, and the base can be self-locking, which can prevent the guardrail column from falling off from the platform bottom beam and prevent the guardrail column from shaking left and right;

[0022] 3. The present invention adopts metal profiles with certain strength to replace the building steel pipes in the prior art, thereby reducing the weight of the guardrail and thus reducing the weight of the aerial work platform;

[0023] 4. The product structure of the present invention enables the guardrails used in the temporary aerial work platform to be assembled, which is particularly suitable for construction operations in confined spaces where it is necessary to transport maintenance materials through manhole doors of smaller sizes, such as internal maintenance of boiler furnaces in thermal power plants;

[0024] 5. The product of the present invention is provided with a groove, a first arc groove and a second arc groove. The shapes and sizes of the above three grooves are consistent with the shapes and sizes of the outer edge of the crossbeam body. The above consistency allows smooth transitions at each connection, thereby preventing the guardrail or aerial work platform from scratching or rubbing the work clothes or safety belts of the staff due to protrusions when in use;

[0025] 6. A whole piece guardrail in the prior art is limited to the manhole door size of about 500mm in diameter in the confined space. When the guardrail component is transported through the manhole door, the width of the whole piece of the component cannot exceed 500mm. This guardrail specification is suitable for small temporary aerial work platforms. The guardrail component of the present invention adopts a single component assembly type, which is not limited by the diameter of the manhole door and can be well matched with various small, medium and large temporary aerial work platforms built in confined spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 : Schematic diagram of the overall structure of the guardrail according to the embodiment of the present invention;

[0027] Figure 2 : A schematic diagram of the structure of a base according to an embodiment of the present invention;

[0028] Figure 3 : A schematic diagram of the structure of a column according to an embodiment of the present invention;

[0029] Figure 4 : A schematic diagram of the structure of a crossbeam according to an embodiment of the present invention;

[0030] Figure 5 : Installation diagram of the base of the embodiment of the present invention;

[0031] Figure 6 : Base locking diagram of an embodiment of the present invention;

[0032] Figure 7 : The present invention Figure 1 A schematic diagram of the structure of the connecting sleeve at the middle A;

[0033] Figure 8 : Installation diagram of the bolted base according to the embodiment of the present invention;

[0034] In the figure: 1. base; 101. bottom plate; 1011. locating pin hole; 1012. wedge iron placement groove; 10121. placement groove narrow side; 102. base locating pin; 103. locking hanging plate assembly; 1031. hanging plate; 10311. vertical plate; 10312. baffle plate; 10313. vertical plate outer side; 1032. shaft ear; 1033. hanging plate shaft; 1034. travel guide block; 104. wedge iron; 1041. wedge iron inclined surface; 2. column; 201. support hook; 2011. first locking pin hole; 2 012. Groove; 202. Column body; 2021. First arc-shaped groove; 2022. Second locking pin hole; 203. Bolt base; 2031. Bolt hole; 2032. Bolt; 3. Crossbeam; 301. Ear plate; 3011. Third locking pin hole; 3012. Second arc-shaped groove; 302. Crossbeam body; 3021. Pin hole; 303. Square pin; 304. Connecting sleeve; 3041. Fourth locking pin hole; 3042. R pin; 4. Platform bottom beam; 401. Positioning sleeve; 402. Outer end of main limb. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0036] Embodiment 1

[0037] like Figure 1-Figure 7As shown, a guardrail comprises: a base 1, the base 1 comprises a bottom plate 101, a base positioning pin 102, a locking hanging plate assembly 103 and a wedge 104, wherein: the bottom plate 101 is provided with a positioning pin hole 1011 and a wedge placement groove 1012; the base positioning pin 102 is installed head-down in the positioning pin hole 1011; the locking hanging plate assembly 103 is provided with a hanging plate 1031, two shaft ears 1032, a hanging plate shaft 1033 and a travel guide block 103 4. The hanging plate 1031 includes a vertical plate 10311 and a baffle 10312 that is at a certain angle to the vertical plate 10311. Preferably, the vertical plate 10311 and the baffle 10312 are in a 90° vertical structure, with the 90° inner angle facing the base positioning pin 102. The travel guide block 1034 is arranged on the outer side of the vertical plate 10311, close to the lower end baffle 10312. The travel guide block 1034 is a cylinder and is perpendicular to the insertion direction of the wedge iron 104. After the outer side surface 10313 of the vertical plate facing outward and the narrow side 10121 of the placement groove are aligned vertically, the entire hanging plate 1031 is slightly moved toward the center of the wedge iron placement groove 1012 by a gap d, and the baffle 10312 is at a height from the inner side of the bottom plate 101 equal to the main limb vertical height H of the platform bottom beam 4. The hanging plate shaft 1033 is installed at the upper end of the vertical plate 10311, the shaft ear 1032 is fixed on both sides of the long side of the bottom plate 101, and the hanging plate shaft 1033 is installed between the shaft ears 1032; the column 2, the column 2 includes a hook 201 provided with a first locking pin hole 2011 and a groove 2012 and a column body 202 provided with a second locking pin hole 2022 and a first arc groove 2021, the hook 201 is fixed on the left and right sides of the column body 202, and the column 2 is integrally installed on the platform bottom beam 4 through the base 1; the crossbeam 3, the crossbeam 3 includes an ear plate 301 provided with a third locking pin hole 3011 and a second arc groove 3012 and a crossbeam body 302 provided with a pin hole 3021, and the crossbeam 3 is connected to the hook 201 through the ear plate 301; the connecting sleeve 304, the connecting sleeve 304 connects the two adjacent crossbeam bodies 302 on the left and right.

[0038] The shapes and sizes of the groove 2012 , the first arc-shaped groove 2021 and the second arc-shaped groove 3012 are consistent with the shapes and sizes of the outer edges of the beam body 302 .

[0039] The column body 202 and the beam body 302 are made of metal materials that can be processed and welded, and their cross-sections are rectangular or circular. Their structures can be round tube profiles, or special-shaped profiles such as square tubes and rectangular tubes, all of which have the same effect application.

[0040] The vertical force borne by the lower end of the wedge 104 needs to be smaller than the friction force that the wedge 104 needs to overcome when moving upward. To ensure the connection reliability of the product, it is necessary to ensure the strength and rigidity of each component and that the wedge will not automatically withdraw under the action of external forces. The forces of each component and the conditions under which the wedge will not automatically withdraw under the action of external forces are derived below. Taking the national standard GB5144 "Crane Safety Regulations" as an example, it requires that the guardrail should be able to withstand a horizontal moving concentrated thrust of 1000N. When the height of the guardrail is 1200mm, the bending moment at the lower end of the guardrail is 1.2×1000=1200N.m, and the vertical force borne by the hanging plate 1031 is 1200 / 0.5B1;

[0041] The force perpendicular to the inclined surface generated by the inclined surface of the wedge iron 104 is Nv=1200 / 0.5B1×a1 / a2;

[0042] The vertical force on the lower end of the wedge 104 is: V 下 =Nv×sinα, horizontal force is N down =Nv×cosα;

[0043] The horizontal force on the upper end of wedge iron 104 is: N 上 =Nv×cosα×ha / hb;

[0044] The horizontal force in the middle of wedge 104 is: N 中 =N 上 +N 下 ;

[0045] The friction force that the wedge iron 104 needs to overcome when moving upward is: F = (N 上 +N 中 )*f(friction factor);

[0046] To ensure the reliability of the connection, the vertical force on the lower end of the wedge must be smaller than the friction force that the wedge needs to overcome when moving upward, that is, V 下 <F。

[0047]

[0048] like Figure 1 As shown, an aerial work platform includes a plurality of the aforementioned guardrails and a platform bottom beam 4, wherein the platform bottom beam 4 includes a positioning sleeve 401. The inner diameter of the positioning sleeve 401 is equal to the diameter of the positioning pin hole 1011, and matches the installation clearance of the base positioning pin 102.

[0049] like Figure 2 , 56, the distance between the center of the positioning pin hole 1011 and the narrow side 10121 of the wedge iron placement groove 1012 is L1, the distance between the center of the diameter of the positioning sleeve 401 and the main limb outer end 402 of the platform bottom beam 4 is L2, the thickness of the vertical plate 10311 is L3, the length of the baffle 10312 is L4, L4≧L2+L3; the protruding part of the main limb outer end 402 is used to install the base 1, and the length of the protruding part is L5, and L5>L2; ensuring the correct numerical relationship between the lengths of L1, L4, and L5 is conducive to inserting and locking the hanging plate assembly 103 and leaving a suitable assembly gap, such as Figure 6 As shown, when the wedge 104 is inserted into the wedge placement groove 1012, the wedge 104 falls under the action of its own weight, and the travel guide block 1034 contacts the wedge inclined surface 1041. The wedge 104 is hit with a small hammer to move it downward. The travel guide block 1034 is squeezed by the wedge 104 to generate a left and right force, driving the hanging plate 1031 to move to one side of the platform bottom beam 4, generating a displacement distance d, so that the hanging plate horizontal baffle 10312 is in close contact with the lower side of the outer end 402 of the bottom beam main limb, thereby realizing the self-stabilizing base 1 being locked on the platform bottom beam 4, which can prevent the guardrail column 2 from falling off from the platform bottom beam 4 and prevent the guardrail column 2 from shaking left and right.

[0050] At the junction of the left and right beam bodies 302, the connecting sleeve 304 is used to connect the left and right beam bodies 302 together. Both ends of the connecting sleeve 304 are provided with fourth locking pin holes 3041. After the connecting sleeve 304 is inserted into the ends of the left and right beam bodies 302, the fourth locking pin hole 3041 at any end is rotated to make it coincide with the pin hole 3021 at the end of the beam body 302, and then the R pin 3042 is passed through the fourth locking pin hole 3041 and the pin hole 3021 to connect the left and right beam bodies 302 into a straight line to form a whole. Figure 1 , 7 As shown, during installation, the assembled column 2 and base 1 are installed as a whole on the platform bottom beam 4. When the base 1 is locked firmly, several cross beams 3 are placed horizontally into the groove 2012 of the hook 201 from bottom to top, and the ear plate 301 is placed between the left and right hooks 201, so that the third locking pin hole 3011 and the first locking pin hole 2011 are concentrically overlapped, and then the square pin 303 is passed through the third locking pin hole 3011 and the first locking pin hole 2011 to connect the cross beam 3 and the column 2 together; finally, a cross beam 3 is placed on the first arc groove 2021, and the ear plate 301 is inserted into the cavity of the column body 202, so that the third locking pin hole 3011 and the second locking pin hole 2022 are concentrically overlapped, and then the square pin 303 is passed through the third locking pin hole 3011 and the second locking pin hole 2022 to connect the upper cross beam 3 and the column 2 together. Embodiment 2

[0051] The difference from the first embodiment lies in the connection relationship between the column 2 and the beam 3. In this embodiment, a single-ear plate support hook 201 is provided at each beam 3 placement node on the column body 202, and the support hook 201 is welded in parallel to the center of the column body 202 at the placement node position of the beam 3 and the column 2; and the ear plate 301 on the beam body 302 is changed to two, and the center positions of the left and right ear plates 301 correspond to the placement nodes of the single-ear plate support hook 201; when the beam 3 is placed on the support hook 201, the left and right ear plates 301 ride on the groove 2012 of the single-ear plate support hook 201, so that the third locking pin hole 3011 and the first locking pin hole 2011 are concentrically overlapped, and then the square pin 303 is passed through the third locking pin hole 3011 and the first locking pin hole 2011 to lock the beam 3 and the column 2 together. Embodiment 3

[0052] The difference from the first embodiment lies in the structure of the column and the base: Figure 8 As shown, when encountering a platform bottom beam 4 with a wider size, the guardrail column 2 can be installed by using a bolt base 203. The guardrail column 2 is directly welded to the bolt base 203. There are bolt holes 2031 on the left and right sides of the bolt base 203. Bolts 2032 are passed through the bolt holes 2031, and the bolt base 203 is tightened and installed on the platform bottom beam 4. The installation of the guardrail cross beam 3 is the same as the above-mentioned scheme.

[0053] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0054] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A guardrail, characterized in that: The guardrail comprises: A base, the base comprising a bottom plate, a base positioning pin, a locking hanging plate assembly and a wedge, wherein: the bottom plate is provided with a positioning pin hole and a wedge placement groove; the base positioning pin is installed in the positioning pin hole; the locking hanging plate assembly is provided with a hanging plate, two shaft ears, a hanging plate shaft and a travel guide block, the hanging plate comprises a vertical plate and a baffle plate which is at an angle of 90° with the vertical plate, the hanging plate shaft is installed at the upper end of the vertical plate, the shaft ears are fixed on both sides of the long side of the bottom plate, the hanging plate shaft is installed between the shaft ears, and the travel guide block is arranged on the outer side of the vertical plate; A column, the column comprising a support hook provided with a groove and a column body provided with a first arc-shaped groove, the support hook is fixed on the left and right sides of the column body, and the column is connected to the base; A crossbeam, wherein the crossbeam comprises an ear plate provided with a second arc-shaped groove and a crossbeam body, wherein the crossbeam is connected to the support hook via the ear plate; and A connecting sleeve connects the crossbeam body.

2. A guardrail according to claim 1, characterized in that: The shapes and sizes of the groove, the first arc-shaped groove and the second arc-shaped groove are consistent with the shapes and sizes of the outer edge of the beam body.

3. A guardrail according to claim 1, characterized in that: The vertical force borne by the lower end of the wedge iron is smaller than the friction force that the wedge iron needs to overcome when moving upward.

4. An aerial work platform, characterized in that: The aerial work platform includes a plurality of guardrails as described in claim 1, and also includes a platform bottom beam, and the platform bottom beam includes a positioning sleeve.

5. The aerial work platform according to claim 4, characterized in that: The spacing distance between the ear plates on the cross beam body is equal to the center distance between the two columns after being installed on the platform bottom beam.

6. The aerial work platform according to claim 4, characterized in that: The inner diameter of the positioning sleeve matches the installation clearance of the base positioning pin.

7. The aerial work platform according to claim 4, characterized in that: The length of the base locating pin is less than or equal to the vertical height of the main limb of the platform bottom beam.

8. The aerial work platform according to claim 4, characterized in that: The height of the vertical plate is equal to the vertical height of the main limb of the platform bottom beam.

9. The aerial work platform according to claim 4, characterized in that: The wedge iron placement groove is provided with a narrow side of the placement groove, the distance between the center of the positioning pin hole and the narrow side of the placement groove on the adjacent side is L1, the distance from the center of the positioning sleeve to the outer end of the main limb of the platform bottom beam is L2, the thickness of the vertical plate is L3, L1=L2+L3, the length of the baffle is L4, and L4≧L2+L3.

10. The aerial work platform according to claim 9, characterized in that: The protruding portion at the outer end of the main limb of the platform bottom beam is used for installing the base, and the length of the protruding portion at the outer end of the main limb is L5, and L5>L2.

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