Climbing frame device for mounting purline of portal steel frame wall

Abstract

The utility model relates to a climbing frame device for mounting a portal steel frame wall purline, and relates to the technical field of purline construction, the climbing frame device comprises two sets of climbing frame assemblies and a fixing assembly, the two sets of climbing frame assemblies are symmetrically mounted on the inner walls of flanges on the two sides of a steel column, and the fixing assembly is connected between the two sets of climbing frame assemblies; and the climbing frame assemblies are used for supporting constructors to move along the steel column. The method has the effect of improving the construction safety of the purline.

Description

Technical Field

[0001] The present application relates to the technical field of purlin construction, and in particular to a climbing frame device for installing purlins of portal steel frame walls. Background Art

[0002] Portal frame steel structure workshops are widely used in industry, commerce, and cultural and entertainment public facilities due to their simple force bearing, quick production, and short construction period.

[0003] The steel frame wall of the portal steel structure factory building needs to be installed with purlins as supporting connectors. The purlins are mainly installed manually. The construction workers fix the safety rope on the steel column and step on the installed purlin. Then they hold the steel column with one hand and install the next purlin with the other hand. And so on. The construction workers step on the purlins and climb the steel columns to install all the purlins of the steel frame wall.

[0004] Construction workers climb steel columns by stepping on purlins. Although safety ropes can prevent construction workers from falling, there is still a risk of slipping during the climbing process, resulting in poor safety of purlin construction. Utility Model Content

[0005] In order to improve the safety of purlin construction, the present application provides a climbing frame device for installing portal steel frame wall purlins.

[0006] The present application provides a climbing frame device for installing portal steel frame wall purlins, which adopts the following technical solution:

[0007] A climbing frame device for installing portal steel frame wall purlins includes a climbing frame assembly and a fixing assembly. The climbing frame assembly is provided with two groups and is symmetrically installed on the inner walls of the flanges on both sides of the steel column. The fixing assembly is connected between the two groups of the climbing frame assemblies and is used to fix the two groups of the climbing frame assemblies. The climbing frame assembly is used to support construction personnel to move along the steel column.

[0008] By adopting the above technical solution, two sets of climbing frame assemblies are fixed by fixing components so that the two sets of climbing frame assemblies are not easy to separate. Then the construction workers stand on the two sets of climbing frame assemblies, and the climbing frame assemblies carry the construction workers to move up and down along the steel columns, so that the construction workers do not need to step on the purlins to climb the steel columns when installing the purlins, thereby reducing the risk of construction workers falling when climbing the steel columns, thereby improving the safety of purlin construction.

[0009] Optionally, the climbing frame assembly includes:

[0010] The climbing electric telescopic member is arranged along the length direction of the steel column;

[0011] Two climbing parts are provided and are respectively connected to the two ends of the climbing electric telescopic member, the climbing parts are connected to the inner wall of the steel column flange, and the connection state is changed between fixed and sliding;

[0012] The footrest part is connected to one of the climbing parts and is used to support the construction personnel.

[0013] By adopting the above technical solution, one of the climbing parts is fixed to the inner wall of the steel column flange, and the other climbing part is slid with the inner wall of the steel column flange. The climbing electric telescopic part is extended to use the climbing part fixed to the steel column flange as a force fulcrum to drive the climbing part sliding with the steel column flange to move. Then, the states of the two climbing parts are changed, the climbing electric telescopic part is contracted, and the climbing part in the sliding state is brought close to the climbing part in the fixed state, completing the movement of the climbing part and the climbing electric telescopic part on the steel column. The footrest part moves with the climbing part connected to it, so that the climbing frame assembly can carry people and move along the steel column.

[0014] Optionally, the climbing part includes:

[0015] A climbing block, fixedly connected to the climbing electric telescopic member;

[0016] Four climbing poles are provided and symmetrically arranged on both sides of the climbing block close to the inner wall of the steel column flange, and one end of the climbing pole is hinged to the climbing block;

[0017] Four climbing boards are provided and correspond to the climbing bars one by one, one side of the climbing board is hinged to the end of the climbing bar away from the climbing block, and the other side abuts against the inner wall of the flange of the steel column;

[0018] Wherein, a climbing cylinder is arranged between the two symmetrical climbing rods, the fixed end of the climbing cylinder is hinged to one of the climbing rods, and the movable end of the climbing cylinder is hinged to the other climbing rod.

[0019] By adopting the above technical solution, the climbing cylinder can drive the two symmetrical climbing rods to swing in directions approaching or moving away from each other. When the two climbing rods swing in directions moving away from each other, the climbing rods can push the climbing board to press against the inner wall of the steel column flange. When the two climbing rods swing in directions approaching each other, the climbing rods can pull the climbing board to press against the inner wall of the steel column flange without generating any squeezing force, thereby enabling the climbing portion and the inner wall of the steel column flange to achieve a transition between fixation and sliding.

[0020] Optionally, the pedal portion includes:

[0021] A foot support rod, one end of which is fixedly connected to the climbing block and is arranged at an angle with the climbing electric telescopic member, and the other end of the foot support rod is bent toward a side close to the steel column;

[0022] A foot pedal is fixedly arranged on one side of the foot pedal support rod close to the steel column;

[0023] Wherein, between the two groups of the climbing frame assemblies, the bent ends of the two foot support rods are abutted, and the fixing assembly fixes the abutting point of the bent ends of the two foot support rods.

[0024] By adopting the above technical solution, the foot support rod connects the climbing block and the foot pedal, so that the construction workers can stand on the foot pedal. On the one hand, it enables the construction workers to move safely on the steel column, and on the other hand, it increases the working space of the construction workers, thereby improving the safety of the construction workers and the comfort of their work; the two foot support rods are fixedly connected by the fixing assembly, so that the two sets of climbing frame assemblies are not easy to separate.

[0025] Optionally, the climbing electric telescopic component is an electric push rod, and a reinforcement rod is provided between the foot support rod and the climbing electric telescopic component, one end of the reinforcement rod is fixedly connected to the foot support rod, and the other end is fixedly connected to the fixed end or the movable end of the climbing electric telescopic component.

[0026] By adopting the above technical solution, the reinforcement rod improves the connection strength between the foot support rod and the climbing electric telescopic member, thereby improving the bearing capacity of the foot pedal.

[0027] Optionally, the footrest is arranged on the climbing part close to the bottom end of the steel column, and the climbing part far from the bottom end of the steel column is connected with a waist protection part, and the waist protection part includes a waist protection support rod, one end of the waist protection support rod is connected to the climbing block, and the other end is bent toward the side close to the steel column;

[0028] Between the two groups of climbing frame assemblies, the bent ends of the two waist protection support rods are abutted, and the fixing assembly fixes the abutting point of the bent ends of the two waist protection support rods.

[0029] By adopting the above technical solution, when the construction workers step on the foot pedals, the waist protection rods can provide protection for the construction workers' waists, thereby improving the safety of the construction workers standing on the foot pedals; the two waist protection rods are also fixed by the fixing components, making it more difficult for the two sets of climbing frame components to separate.

[0030] Optionally, a support rod is provided between the waist support rod and the climbing electric telescopic member.

[0031] By adopting the above technical solution, the support rod uses the climbing electric telescopic part as a fulcrum to provide support force to the waist protection support rod, thereby improving the connection strength of the waist protection support rod, thereby making the waist protection support rod more reliable in protecting construction workers.

[0032] Optionally, one end of the support rod is hinged to the waist protection support rod, and the other end is fixedly connected to one end of the reinforcement rod close to the climbing electric telescopic part. An electric telescopic waist protection part is arranged between the waist protection support rod and the climbing block. The electric telescopic waist protection part is fixedly connected to the waist protection support rod and hinged to the climbing block. A handle is fixedly provided on the waist protection support rod.

[0033] By adopting the above technical solution, when the climbing frame assembly moves up or down, the climbing electric telescopic part extends to increase the distance between the two climbing parts. Since the support rod is fixedly connected to the reinforcement rod, and the distance between the waist protection support rod and the climbing block can be increased by the extension of the waist protection electric telescopic part, the waist protection support rod can be rotated toward the direction close to the foot support rod when the climbing electric telescopic part is extended, so that the handle on the waist protection support rod can be moved from the waist of the construction worker to the thigh of the construction worker, so that the construction worker can grasp the handle in a standing position to prevent himself from shaking during the movement of the climbing frame assembly.

[0034] Optionally, the fixing assembly includes a connecting column and a connecting sleeve, wherein four connecting columns are provided and are divided into two groups, and two connecting sleeves are provided and correspond one to one with the two groups of connecting columns, wherein the two connecting columns of one group are respectively fixed at the abutment of the two foot support rods, and the two connecting columns of the other group are respectively fixed at the abutment of the two waist support rods, the connecting columns are semi-cylindrical, and the two connecting columns of each group constitute a complete cylinder, and the connecting sleeve is threadedly sleeved on the two connecting columns.

[0035] By adopting the above technical solution, the connecting sleeve is threadedly sleeved on the two corresponding connecting columns, so that the abutting points of the two waist support rods and the two foot support rods are easy to fix.

[0036] In summary, the present application includes at least one of the following beneficial technical effects:

[0037] 1. By setting up the climbing electric telescopic parts, the climbing part and the foot pedal, the construction workers can step on the foot pedal and move on the steel column by relying on the climbing part and the climbing electric telescopic parts, which reduces the risk of construction workers falling and improves the safety of purlin construction;

[0038] 2. The safety of construction workers is further improved by setting up waist support rods;

[0039] 3. By setting up the electric telescopic waist protector, support rod and handle, it is easy for construction workers to grasp the handle without shaking during movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application;

[0041] Figure 2 yes Figure 1 Magnified view at A in the middle;

[0042] Figure 3 yes Figure 1 Magnified view at B.

[0043] Description of reference numerals:

[0044] 1. Climbing frame assembly; 11. Climbing electric telescopic part; 12. Climbing part; 121. Climbing block; 122. Climbing rod; 123. Climbing board; 124. Climbing cylinder; 13. Pedal part; 131. Pedal support rod; 132. Foot pedal; 133. Reinforcement rod; 14. Waist protection part; 141. Waist protection support rod; 142. Support rod; 143. Waist protection electric telescopic part; 144. Handle; 2. Fixing assembly; 21. Connecting column; 22. Connecting sleeve. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-3 This application is described in further detail.

[0046] The present application embodiment discloses a climbing frame device for installing portal steel frame wall purlins. Figure 1 A climbing frame device for installing portal steel frame wall purlins includes a climbing frame assembly 1 and a fixing assembly 2. The climbing frame assembly 1 is provided with two groups and is symmetrically installed on the inner walls of the flanges on both sides of the steel column. The fixing assembly 2 is connected between the two groups of climbing frame assemblies 1 and is used to fix the two groups of climbing frame assemblies 1. The climbing frame assembly 1 is used to support construction personnel to move along the steel column.

[0047] When in use, two sets of climbing frame assemblies 1 are installed on the steel column, and the fixing assembly 2 fixes the two sets of climbing frame assemblies 1. The construction workers stand on the two sets of climbing frame assemblies 1. The climbing frame assemblies 1 carry the construction workers to move along the steel column, so that the construction workers do not need to climb the steel column through the purlin, thereby improving the safety of the purlin construction.

[0048] Reference Figure 1 , the steel columns are set vertically, and the horizontal cross-section is I-shaped.

[0049] The climbing frame assembly 1 includes a climbing electric telescopic member 11, a climbing portion 12, a footrest portion 13 and a waist protection portion 14; the climbing electric telescopic member 11 is an electric push rod and is vertically arranged between the inner walls of the steel column flange, and the movable end of the climbing electric telescopic member 11 is located at its bottom end.

[0050] Reference Figure 1 and Figure 2Two climbing parts 12 are provided, and are respectively located at the top and bottom ends of the climbing electric telescopic part 11. The climbing part 12 includes a climbing block 121, a climbing rod 122 and a climbing plate 123. The climbing block 121 is in a round block shape and is horizontally arranged. The side wall of the climbing block 121 located at the top end of the climbing electric telescopic part 11 is fixedly connected to the fixed end of the climbing electric telescopic part 11, and the side wall of the climbing block 121 located at the bottom end of the climbing electric telescopic part 11 is fixedly connected to the movable end of the climbing electric telescopic part 11.

[0051] Reference Figure 2 There are four climbing rods 122, which are symmetrically arranged on both sides of the climbing block 121 close to the inner wall of the steel column flange. The two climbing rods 122 on each side of the climbing block 121 are respectively located at the top and bottom of the climbing block 121. The climbing rod 122 is in the shape of a rectangular rod, and one end in the length direction is hinged to the side wall of the climbing block 121. Two adjacent climbing rods 122 are arranged at an angle.

[0052] There are four climbing boards 123 corresponding to the climbing poles 122 one by one. The climbing boards 123 are rectangular and vertically arranged. One side of the climbing board 123 is hinged to one end of the climbing pole 122 away from the climbing block 121, and the other side abuts against the inner wall of the steel column flange.

[0053] A climbing cylinder 124 is provided between the two symmetrical climbing rods 122. The climbing cylinder 124 is arranged horizontally. The fixed end of the climbing cylinder 124 is hinged to one end of one of the climbing rods 122 close to the climbing board 123, and the movable end of the climbing cylinder 124 is hinged to the end of the other climbing rod 122 close to the climbing board 123.

[0054] Reference Figure 1 The foot pedal portion 13 is arranged on the climbing block 121 at the bottom end of the climbing electric telescopic member 11. The foot pedal portion 13 includes a foot pedal rod 131 and a foot pedal 132. The foot pedal rod 131 is in the shape of a round rod and is arranged horizontally. One end of the foot pedal rod 131 in the axial direction is fixedly connected to the climbing block 121, and the other end is bent at 90° toward the side close to the steel column.

[0055] The foot pedal 132 is in the shape of a rectangular plate and is arranged horizontally. The foot pedal 132 is located on the side of the foot support rod 131 close to the steel column and is fixedly connected to the foot support rod 131. The length direction of the foot pedal 132 is arranged parallel to the axial direction of the foot support rod 131.

[0056] A reinforcement rod 133 is arranged between the pedal support rod 131 and the climbing electric telescopic member 11. The reinforcement rod 133 is in the shape of a round rod and is arranged obliquely. One end of the reinforcement rod 133 in the axial direction is fixedly connected to the pedal support rod 131, and the other end is fixedly connected to the movable end of the climbing electric telescopic member 11.

[0057] The waist protection part 14 is arranged on the climbing block 121 at the top of the climbing electric telescopic part 11. The waist protection part 14 includes a waist protection support rod 141, a support rod 142 and a waist protection electric telescopic part 143. The waist protection electric telescopic part 143 is also an electric push rod. The movable end of the waist protection electric telescopic part 143 is hinged to the climbing block 121; the waist protection support rod 141 is in the shape of a circular rod, and one end in the axial direction is fixedly connected to the fixed end of the waist protection electric telescopic part 143. The axial direction of the waist protection support rod 141 is consistent with the telescopic direction of the waist protection electric telescopic part 143. The end of the waist protection support rod 141 away from the waist protection electric telescopic part 143 is bent at 90° toward the direction close to the steel column.

[0058] The support rod 142 is in the shape of a round rod and is arranged between the waist protection support rod 141 and the climbing electric telescopic component 11. The support rod 142 is arranged at an angle. One end of the support rod 142 in the axial direction is fixedly connected to one end of the reinforcement rod 133 close to the climbing electric telescopic component 11, and the other end is hinged to one end of the waist protection support rod 141 close to the waist protection electric telescopic component 143.

[0059] A handle 144 is fixedly connected to the side of the waist support rod 141 away from the foot support rod 131. When the climbing frame assembly 1 is in a static state, the waist support rod 141 and the waist protection electric telescopic member 143 are both in a horizontal state.

[0060] When in use, the construction worker stands on the two foot pedals 132, grasps the two handles 144 with both hands, and starts the climbing cylinder 124, so that the two climbing cylinders 124 in one climbing part 12 extend synchronously, and the two climbing cylinders 124 in the other climbing part 12 retract synchronously, the climbing cylinder 124 extends and drives the two climbing rods 122 to swing away from each other, the climbing rods 122 push the climbing board 123 to press against the inner wall of the steel column flange, the climbing cylinder 124 retracts and drives the two climbing rods 122 to swing towards each other, the climbing rods 122 push the climbing board 123 to press against the inner wall of the steel column flange without applying a squeezing force, so that the climbing board 123 of one climbing part 12 is fixed to the inner wall of the steel column flange, and the climbing board 123 of the other climbing part 12 slides against the inner wall of the steel column flange.

[0061] Start the climbing electric telescopic component 11, the climbing electric telescopic component 11 extends, and drives the climbing part 12 that slides with the inner wall of the steel column flange to move, so that the distance between the two climbing parts 12 increases. At the same time, the support rod 142 pulls the waist protection support rod 141 to swing, and the waist protection electric telescopic component 143 cooperates to extend, and then the climbing cylinder 124 drives the two climbing parts 12 to change their states, and the climbing electric telescopic component 11 contracts to reduce the distance between the two climbing parts 12, thereby realizing the movement of the climbing frame assembly 1 along the steel column, so that construction workers can move along the steel column in a standing state, thereby improving the safety of purlin construction.

[0062] When installing the purlins, the construction workers first move to the top of the steel column with the help of the climbing frame assembly 1, and then install the purlins one by one while moving downward from the top of the steel column.

[0063] Reference Figure 1 Between the two sets of climbing frame assemblies 1, the bent ends of the two waist support rods 141 are abutted, and the bent ends of the two foot support rods 131 are also abutted.

[0064] Reference Figure 1 and Figure 3 The fixing assembly 2 includes a connecting column 21 and a connecting sleeve 22. There are four connecting columns 21, which are divided into two groups. The two connecting columns 21 in one group are respectively fixed at the top of the abutment of the two foot support rods 131, and the two connecting columns 21 in the other group are respectively fixed at the top of the abutment of the two waist support rods 141.

[0065] Reference Figure 3 The connecting column 21 is semi-cylindrical, and the two connecting columns 21 of each group constitute a complete cylinder. The side of the two connecting columns 21 close to each other is its own plane side, and they are abutted. The connecting sleeve 22 is circular sleeve-shaped, and two connecting sleeves 22 are provided. The two connecting sleeves 22 correspond to the two groups of connecting columns 21 one by one, and the connecting sleeves 22 are threadedly sleeved on the two connecting columns 21.

[0066] When in use, the two waist support rods 141 and the two foot support rods 131 are brought into contact with each other at their bent ends, and the connecting sleeve 22 is screwed onto the two abutting connecting columns 21 to facilitate the fixation of the two waist support rods 141 and the two foot support rods 131.

[0067] The implementation principle of a climbing frame device for installing purlins of a portal steel frame wall according to an embodiment of the present application is as follows: when in use, the construction worker stands on the foot pedal 132 and first starts the climbing cylinder 124, which drives the climbing plate 123 to move through the climbing rod 122, so that the climbing plate 123 of one climbing part 12 is pressed against the inner wall of the steel column flange, and the climbing plate 123 of the other climbing part 12 is pressed against the inner wall of the steel column flange without applying a squeezing force, and starts the climbing electric telescopic member 11 and the waist protection electric telescopic member. 143, the climbing electric telescopic component 11 drives the distance between the two climbing parts 12 to increase, the waist protection electric telescopic component 143 drives the waist protection support rod 141 to swing, and then the climbing cylinder 124 drives the two climbing parts 12 to change their states, and the climbing electric telescopic component 11 drives the distance between the two climbing parts 12 to decrease. During the movement, the two climbing parts 12 drive the foot pedal 132 to move, so that the construction workers standing on the foot pedal 132 can move relative to the steel column, thereby improving the safety of the purlin construction.

[0068] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A climbing frame device for installing portal steel frame wall purlins, characterized in that: The invention comprises a climbing frame assembly (1) and a fixing assembly (2), wherein the climbing frame assembly (1) is provided with two groups and is symmetrically mounted on the inner walls of the flanges on both sides of a steel column, the fixing assembly (2) is connected between the two groups of the climbing frame assemblies (1) and is used to fix the two groups of the climbing frame assemblies (1), and the climbing frame assembly (1) is used to support construction personnel to move along the steel column.

2. A climbing frame device for installing portal steel frame wall purlins according to claim 1, characterized in that: The climbing frame assembly (1) comprises: A climbing electric telescopic member (11) is arranged along the length direction of the steel column; Two climbing parts (12) are provided and are respectively connected to the two ends of the climbing electric telescopic member (11); the climbing parts (12) are connected to the inner wall of the steel column flange, and the connection state is switched between fixed and sliding; The footrest portion (13) is connected to one of the climbing portions (12) and is used to support construction personnel.

3. A climbing frame device for installing portal steel frame wall purlins according to claim 2, characterized in that: The climbing part (12) comprises: A climbing block (121) is fixedly connected to the climbing electric telescopic member (11); Four climbing rods (122) are provided and symmetrically arranged on both sides of the climbing block (121) close to the inner wall of the steel column flange, and one end of the climbing rod (122) is hinged to the climbing block (121); Four climbing boards (123) are provided and correspond one to one with the climbing bars (122); one side of the climbing board (123) is hinged to an end of the climbing bar (122) away from the climbing block (121), and the other side abuts against the inner wall of the steel column flange; A climbing cylinder (124) is provided between the two symmetrical climbing rods (122); a fixed end of the climbing cylinder (124) is hinged to one of the climbing rods (122); and a movable end of the climbing cylinder (124) is hinged to the other climbing rod (122).

4. A climbing frame device for installing portal steel frame wall purlins according to claim 3, characterized in that: The pedal portion (13) comprises: A foot support rod (131), one end of which is fixedly connected to the climbing block (121) and is arranged at an angle with the climbing electric telescopic member (11); the other end of the foot support rod (131) is bent toward a side close to the steel column; A foot pedal (132) is fixedly mounted on a side of the foot pedal support rod (131) close to the steel column; Wherein, between the two groups of the climbing frame assemblies (1), the bent ends of the two foot support rods (131) are abutted, and the fixing assembly (2) fixes the abutting point of the bent ends of the two foot support rods (131).

5. A climbing frame device for installing portal steel frame wall purlins according to claim 4, characterized in that: The climbing electric telescopic member (11) is an electric push rod, and a reinforcing rod (133) is provided between the pedal support rod (131) and the climbing electric telescopic member (11); one end of the reinforcing rod (133) is fixedly connected to the pedal support rod (131), and the other end is fixedly connected to a fixed end or a movable end of the climbing electric telescopic member (11).

6. A climbing frame device for installing portal steel frame wall purlins according to claim 5, characterized in that: The footrest portion (13) is arranged on the climbing portion (12) close to the bottom end of the steel column, and the climbing portion (12) far from the bottom end of the steel column is connected to a waist protection portion (14), wherein the waist protection portion (14) comprises a waist protection support rod (141), one end of the waist protection support rod (141) is connected to the climbing block (121), and the other end is bent toward a side close to the steel column; Between the two groups of climbing frame assemblies (1), the bent ends of the two waist protection support rods (141) are abutted, and the fixing assembly (2) fixes the abutting point of the bent ends of the two waist protection support rods (141).

7. A climbing frame device for installing portal steel frame wall purlins according to claim 6, characterized in that: A support rod (142) is provided between the waist protection support rod (141) and the climbing electric telescopic member (11).

8. A climbing frame device for installing portal steel frame wall purlins according to claim 7, characterized in that: One end of the support rod (142) is hinged to the waist protection support rod (141), and the other end is fixedly connected to one end of the reinforcement rod (133) close to the climbing electric telescopic component (11). An electric telescopic waist protection component (143) is arranged between the waist protection support rod (141) and the climbing block (121). The electric telescopic waist protection component (143) is fixedly connected to the waist protection support rod (141) and hinged to the climbing block (121). A handle (144) is fixedly provided on the waist protection support rod (141).

9. A climbing frame device for installing portal steel frame wall purlins according to claim 6, characterized in that: The fixing assembly (2) comprises a connecting column (21) and a connecting sleeve (22). Four connecting columns (21) are provided and are divided into two groups. Two connecting sleeves (22) are provided and correspond to the two groups of connecting columns (21) one by one. The two connecting columns (21) in one group are respectively fixed at the abutment of the two foot support rods (131), and the two connecting columns (21) in the other group are respectively fixed at the abutment of the two waist support rods (141). The connecting columns (21) are semi-cylindrical, and the two connecting columns (21) in each group form a complete cylinder. The connecting sleeve (22) is threadedly sleeved on the two connecting columns (21).

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