Construction equipment for building exterior wall scaffolding load-bearing layer

Abstract

The present invention relates to a construction device for building a load-bearing layer of an external wall scaffold, and belongs to the technical field of building construction. It includes a transport component, a discharging component, a positioning component and a flipping component. The transport component includes a mobile base, and a bucket with adjustable width is provided on the mobile base. The bottom of the bucket is provided with an inclined guide surface, and the guide surface extends from high to low to both sides of the bucket. The two sides of the bucket are respectively provided with a discharging component, a positioning component and a flipping component; the flipping component includes a flipping bracket respectively installed on both sides of the bucket, and a clamping mechanism is installed on the flipping bracket. The clamping mechanism is arranged corresponding to the positioning groove. The flipping bracket at one end of the clamping mechanism is provided with a flipping mechanism. The flipping mechanism realizes secondary auxiliary locking of the clamping mechanism by a force acting on the steel pipe to be installed. The present invention provides a construction device for building a load-bearing layer of an external wall scaffold, which realizes semi-automatic construction, avoids manual vertical steel pipes, and greatly reduces manpower operation.

Description

Technical Field

[0001] The invention relates to a construction device for constructing a load-bearing layer of an external wall scaffolding of a building construction, and belongs to the technical field of building construction. Background Art

[0002] As the most common type of scaffolding at construction sites, the coupler steel pipe scaffolding has become an indispensable key tool in construction due to its series of significant advantages, such as streamlined components, convenient installation process, quick disassembly, and excellent load-bearing performance. Before starting the construction of the main building, the first task is to build a stable external wall scaffolding to lay the foundation for subsequent layer-by-layer construction.

[0003] At present, the construction of the coupler steel pipe scaffolding mainly relies on manual operation, which has extremely high requirements for skilled workers and is usually carried out by an experienced team of scaffolders. By using key components such as right-angle couplers, rotating couplers and butt couplers, steel pipes with a diameter of 48 mm are assembled to build a scaffolding system.

[0004] During the construction process, the inventor discovered that the prior art has at least the following technical problems:

[0005] The load-bearing layer of the scaffolding is the supporting steel pipe at the bottom of the scaffolding. It is built on a pre-laid foundation. Usually, the longitudinal steel pipes are installed with vertical steel pipes through right-angle fasteners. The longitudinal steel pipes need to be connected one by one through butt fasteners, and finally fixed with right-angle fasteners or rotating fasteners. The horizontal steel pipes or partially inclined steel pipes can be fixed. However, when fixing the vertical steel pipes, the right-angle fasteners need to be pre-fixed to the longitudinal steel pipes, and then the vertical steel pipes are inserted and fixed. At present, a 6-meter-long steel pipe generally weighs about 25kg. It takes a lot of force to manually vertically erect the steel pipe from one end, so there is a certain degree of difficulty in installation. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a construction device for building a load-bearing layer of an exterior wall scaffolding for construction, thereby realizing semi-automatic construction, avoiding manual vertical steel pipes, and greatly reducing manpower operations.

[0007] The construction device for building a load-bearing layer of an external wall scaffolding of a building construction of the present invention comprises:

[0008] The transport component comprises a mobile base, a width-adjustable bucket is arranged on the mobile base, an inclined guide surface is arranged at the bottom of the bucket, and the guide surface extends from high to low to both sides of the bucket, and a discharging component, a positioning component and a turning component are arranged on both sides of the bucket respectively;

[0009] The discharging assembly comprises discharging rotating drums respectively installed on both sides of the bucket, a driving mechanism I is installed at the end of the bucket corresponding to the discharging rotating drum, and the output end of the driving mechanism I is connected to the discharging rotating drum;

[0010] The positioning assembly includes positioning frames respectively installed on both sides of the truck bucket, and the positioning frames are respectively provided with steel pipe positioning grooves and steel pipe supporting rollers corresponding to the pipe outlet positions of the discharging drum;

[0011] The flipping assembly includes a flipping bracket installed on both sides of the truck bed respectively, a clamping mechanism installed on the flipping bracket, the clamping mechanism is arranged corresponding to the positioning groove, and a flipping mechanism is provided on the flipping bracket at one end of the clamping mechanism. The flipping mechanism realizes secondary auxiliary locking of the clamping mechanism by exerting force on the steel pipe to be installed.

[0012] Furthermore, the clamping mechanism includes a clamping frame, a clamping groove is correspondingly provided on the clamping frame, two clamping claws corresponding to the clamping groove are hingedly installed in the clamping frame and used in cooperation with each other, a return spring is installed between the two clamping claws, and a driving component for controlling the clamping of the clamping claws is provided at one end of the clamping frame;

[0013] The clamping frame is hingedly installed on the turning bracket, and a resetting telescopic cylinder is hingedly connected between the turning bracket and the clamping frame.

[0014] Furthermore, the driving component includes a fixed frame installed inside the clamping frame, a parallel four-bar mechanism is hinged inside the fixed frame, a pushing column for controlling the movement of the parallel four-bar mechanism is provided inside the parallel four-bar mechanism, a pull rod is connected to the pushing column, the pull rod slides through the clamping frame, a support plate is provided at the end of the pull rod outside the clamping frame, a locking telescopic cylinder is installed on the support plate, a locking plate for secondary auxiliary locking is provided on the support plate, the locking plate is slid onto the support plate, and a locking telescopic cylinder is connected to one end of the locking plate.

[0015] Furthermore, the flipping mechanism includes a swinging member hingedly mounted on the flipping bracket, and a driving mechanism II for driving the swinging member to move is correspondingly provided on the flipping bracket.

[0016] Furthermore, the swinging member includes a driving portion arranged in a cylindrical shape, an outer surface of the driving portion is provided with a pushing portion extending outward, and an elastic block is elastically provided at the end of the pushing portion.

[0017] Furthermore, an arc gear plate and an arc block are respectively installed on the driving part, and the output end of the driving mechanism II is connected with a main gear matched with the arc gear plate.

[0018] Furthermore, the steel pipe positioning groove of the positioning frame is arranged corresponding to the clamping groove, and a positioning plate is provided at one end of the positioning groove located on the outside, and the positioning plate is used to block the steel pipe to be installed, so that the steel pipe to be installed enters the positioning groove.

[0019] Furthermore, at least two groups of positioning frames are provided on one side of the truck bucket, one group is arranged at a position close to the end of the truck bucket, and the other group is installed at a position close to one end of the truck bucket near the tipping assembly.

[0020] Furthermore, a plurality of guide rollers are correspondingly installed at the lower end of the positioning frame, and a plurality of guide rollers are also installed at the lower end of the turning bracket. The guide rollers on the positioning frame and the guide rollers on the turning bracket form a steel pipe support roller table.

[0021] Furthermore, a slide rail is installed on the mobile base, a slider is installed at the lower end of the truck bucket corresponding to the slide rail, a transmission rod is installed in the middle of the mobile base, and threaded moving blocks are respectively provided on both sides of the transmission rod, and the moving blocks are respectively fixedly installed on the truck buckets on both sides.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention places steel pipes through a transport assembly, places the steel pipes to be installed on the flip assembly through a discharging assembly, ensures the position of the steel pipes to be installed on the flip assembly through a positioning assembly, ensures the reliability of movement, thereby realizing semi-automatic construction, avoiding manual vertical steel pipes, and greatly reducing human operation.

[0024] The present invention greatly simplifies the structure required for flipping the steel pipe to be installed by separately arranging the flipping mechanism and the clamping mechanism. If the clamping mechanism is used directly for flipping, a high-power hydraulic telescopic cylinder is required to cooperate with a hydraulic station for flipping, and the hydraulic station is difficult to maintain. Therefore, the flipping mechanism is used in conjunction with the clamping mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is one of the structural diagrams of Embodiment 1 of the present invention;

[0026] Figure 2 is a front view of Embodiment 1 of the present invention;

[0027] Figure 3 yes Figure 2 Enlarged view of the full section view at AA in the middle;

[0028] Figure 4 This is the second structural diagram of Embodiment 1 of the present invention;

[0029] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle;

[0030] Figure 6 This is one of the schematic diagrams of the flip assembly structure of Example 1 of the present invention;

[0031] Figure 7 This is the second schematic diagram of the flip assembly structure of Example 1 of the present invention;

[0032] Figure 8 is a structural view of the clamping mechanism of Example 1 of the present invention;

[0033] Fig. 9 is a front view of the clamping mechanism of Example 1 of the present invention;

[0034] Fig.10 yes Fig. 9 Full section view at CC;

[0035] Fig.11 This is one of the schematic diagrams of the construction process of Example 1 of the present invention;

[0036] Fig.12 This is the second schematic diagram of the construction process of Example 1 of the present invention;

[0037] Fig.13 This is the third schematic diagram of the construction process structure of Example 1 of the present invention;

[0038] In the figure:

[0039] 1. Transport component; 11. Cargo box; 111. Guide surface; 112. Sliding block; 12. Mobile base; 121. Slide rail; 122. Transmission rod;

[0040] 2. Turnover assembly; 21. Clamping mechanism; 211. Clamping frame; 2111. Clamping groove; 212. Clamping claw; 213. Driving component; 2131. Fixed frame; 2132. Parallel four-bar mechanism; 2133. Pull rod; 2134. Locking telescopic cylinder; 2135. Support plate; 232. Driving mechanism II; 2136. Locking telescopic cylinder; 2137. Locking plate; 2138. Push column; 214. Reset telescopic cylinder; 215. Reset spring; 22. Turnover bracket; 23. Turnover mechanism; 2311. Arc gear plate; 2312. Arc block; 2313. Elastic block; 231. Swinging member;

[0041] 3. Positioning assembly; 31. Positioning frame; 311. Positioning plate; 312. Positioning groove; 313. Guide plate; 314. Buffer plate; 32. Guide roller;

[0042] 4. Discharging assembly; 41. Discharging drum; 411. Steel pipe receiving tank; 42. Driving mechanism I;

[0043] 5. Steel pipes to be installed. DETAILED DESCRIPTION

[0044] Example 1

[0045] like Figures 1 to 13As shown, the construction device for building a load-bearing layer of an external wall scaffolding of a building construction according to the present invention comprises:

[0046] The transport assembly 1 comprises a mobile base 12, on which a width-adjustable bucket 11 is disposed, and an inclined guide surface 111 is disposed at the bottom of the bucket 11, the guide surface 111 extends from high to low toward both sides of the bucket 11, and a discharging assembly 4, a positioning assembly 3 and a turning assembly 2 are disposed on both sides of the bucket 11 respectively;

[0047] The distance between the vertical steel pipes is appropriately adjusted according to actual needs and safety requirements. Generally, the maximum spacing does not exceed 1.8m. Too large a spacing can easily affect the stability of the scaffolding. Therefore, more reinforced steel pipes are required inside. The width adjustment of the truck bed 11 can better adapt to the distance between the vertical steel pipes.

[0048] The discharging assembly 4 includes a discharging drum 41 respectively installed on both sides of the bucket 11, and a driving mechanism I42 is installed at the end of the bucket 11 corresponding to the discharging drum 41, and the output end of the driving mechanism I42 is connected to the discharging drum 41; the driving mechanism I42 adopts a servo motor;

[0049] The positioning assembly 3 includes positioning frames 31 respectively installed on both sides of the truck bed 11. The positioning frames 31 are respectively provided with steel pipe positioning grooves 312 and steel pipe supporting rollers corresponding to the pipe outlet positions of the discharging drum 41; a steel pipe accommodating groove 411 is opened on the discharging drum 41 for conveying a single steel pipe.

[0050] The flip assembly 2 includes a flip bracket 22 respectively installed on both sides of the truck bed 11, and a clamping mechanism 21 is installed on the flip bracket 22. The clamping mechanism 21 is arranged corresponding to the positioning groove 312. A flip mechanism 23 is provided on the flip bracket 22 at one end of the clamping mechanism 21. The flip mechanism 23 realizes secondary auxiliary locking of the clamping mechanism 21 by exerting a force on the steel pipe 5 to be installed.

[0051] The clamping mechanism 21 includes a clamping frame 211, on which a clamping groove 2111 is correspondingly provided, and two clamping claws 212 that cooperate with each other are hingedly installed in the clamping frame 211 corresponding to the clamping groove 2111, and a return spring 215 is installed between the two clamping claws 212. A driving component 213 for controlling the clamping of the clamping claws 212 is provided at one end of the clamping frame 211;

[0052] The clamping frame 211 is hingedly mounted on the flip bracket 22 , and a resetting telescopic cylinder 214 is also hingedly mounted between the flip bracket 22 and the clamping frame 211 . The resetting telescopic cylinder 214 is a pneumatic cylinder.

[0053] like Figure 8 to Figure 10As shown, the driving component 213 includes a fixed frame 2131 installed inside the clamping frame 211, and a parallel four-bar mechanism 2132 is hinged inside the fixed frame 2131. The parallel four-bar mechanism 2132 is provided with a pushing column 2138 for controlling the movement of the parallel four-bar mechanism 2132. The pushing column 2138 is connected with a pull rod 2133, and the pull rod 2133 slides through the clamping frame 211. A support plate 2135 is provided at the end of the pull rod 2133 outside the clamping frame 211, and a locking telescopic cylinder 2134 is installed on the support plate 2135. The locking telescopic cylinder 2134 is arranged with a cylinder, and a locking plate 2137 for secondary auxiliary locking is provided on the support plate 2135. The locking plate 2137 is slidably set on the support plate 2135, and one end of the locking plate 2137 is connected to a locking telescopic cylinder 2136, and the locking telescopic cylinder 2136 is arranged with an electric cylinder.

[0054] The parallel four-bar mechanism 2132 is used to push out the clamping claw 212 in parallel, so that the clamping claw 212 is more stably stressed. The pushing column 2138 is used to pull the parallel four-bar mechanism 2132. When the steel pipe 5 to be installed is turned over, the clamping claw 212 is stressed. At this time, the rear end of the clamping claw 212 acts on the parallel four-bar mechanism 2132. At this time, the connecting rod in the parallel four-bar mechanism 2132 acts on the pushing column 2138, and most of the force is pressed on the pushing column 2138, so that the purpose of locking the clamping claw 212 can be achieved with very little force.

[0055] The flip mechanism 23 includes a swinging member 231 hingedly mounted on the flip bracket 22. A driving mechanism II 232 for driving the swinging member 231 is correspondingly provided on the flip bracket 22. The driving mechanism II 232 adopts a servo motor.

[0056] The swinging member 231 includes a cylindrically arranged driving part, and a pushing part extending outward is provided on the outer surface of the driving part. An elastic block 2313 is elastically provided at the end of the pushing part. The elastic block 2313 is elastically connected to the end of the pushing part by a hinged combination with a compression spring. The setting of the elastic block 2313 can make the steel pipe 5 to be installed better in a vertical position.

[0057] The driving part is respectively installed with an arc gear plate 2311 and an arc block 2312. The output end of the driving mechanism II 232 is connected with a main gear matched with the arc gear plate 2311. The arc block 2312 is set with a rubber block.

[0058] like Figure 3As shown, the steel pipe positioning groove 312 of the positioning frame 31 is arranged corresponding to the clamping groove 2111, and a positioning plate 311 is provided at the outer end of the positioning groove 312, and the positioning plate 311 is used to block the steel pipe 5 to be installed, so that the steel pipe 5 to be installed enters the positioning groove 312; a guide plate 313 is provided at the inner end of the positioning groove 312, and a buffer plate 314 is provided on the positioning frame 31 located at the lower end of the discharging drum 41, and the buffer plate 314 prevents the steel pipe from falling directly onto the guide roller 32.

[0059] There are at least two groups of positioning frames 31 on one side of the truck bed 11, one group is arranged near the end of the truck bed 11, and the other group is installed at a position near one end of the truck bed 11 near the flip assembly 2, and is used to support the fallen steel pipe 5 to be installed. If less than two groups of positioning frames 31 are used, the fallen steel pipe 5 to be installed will not easily enter the positioning groove 312.

[0060] A plurality of guide rollers 32 are correspondingly installed at the lower end of the positioning frame 31, and a plurality of guide rollers 32 are also installed at the lower end of the turning bracket 22. The guide rollers 32 on the positioning frame 31 and the guide rollers 32 on the turning bracket 22 form a steel pipe support rollerway, which is used to support the longitudinal steel pipe.

[0061] A slide rail 121 is installed on the mobile base 12, a slider 112 is installed at the lower end of the truck bed 11 corresponding to the slide rail 121, a transmission rod 122 is installed in the middle of the mobile base 12, and threaded moving blocks are respectively provided on both sides of the transmission rod 122, and the moving blocks are respectively fixedly installed on the truck beds 11 on both sides.

[0062] Working process or working principle:

[0063] like Fig.11 As shown, during operation, a steel wire rope is used for pulling construction, and a motor is used to drive a wire reel from a corresponding end for pulling, thereby ensuring the straightness of the movable base 12. At the same time, other driving methods can also be used for movement.

[0064] like Figure 3 As shown, the steel pipe in the bucket 11 rolls to both sides along the guide surface 111, and when the discharging drum 41 rotates, the steel pipe enters the steel pipe accommodating groove 411. When the discharging drum 41 rotates toward the outside of the bucket 11, the steel pipe 5 to be installed rolls into the positioning groove 312 along the guide plate 313, and at the same time, the other end of the steel pipe 5 to be installed falls into the clamping groove 2111. At this time, the end of the steel pipe 5 to be installed is still a short distance away from the locking plate 2137. At this time, the swing member 231 rotates, and the arc block 2312 drives the steel pipe 5 to be installed to move under the action of friction, so that the steel pipe 5 to be installed is against the locking plate 2137. At this time, the push column 2138 is pulled by the pull rod 2133, and the push column 2138 drives the parallel four-bar mechanism 2132 to move, and the parallel four-bar mechanism 2132 drives the clamping claw 212 to move. At this time, the locking telescopic cylinder 2134 is locked.

[0065] like Figure 6 to Figure 12 As shown, with the continuous rotation of the swing member 231, the steel pipe 5 to be installed is pushed up, and as it is pushed up little by little, the steel pipe 5 to be installed changes from horizontal to gradually vertical. At this time, the gravity of the steel pipe 5 to be installed acts on the locking plate 2137, thereby making the locking more stable.

[0066] like Fig.12 As shown, after the steel pipe 5 to be installed is vertical, the corresponding right-angle fasteners are installed to fix and lock the right-angle fasteners on the longitudinal steel pipe, while the right-angle fasteners on the steel pipe 5 to be installed are locked but not tightened. At this time, the locking telescopic cylinder 2136 drives the locking plate 2137 to move, and the steel pipe 5 to be installed falls down. At this time, the angle fasteners are locked and completely fixed and tightened.

[0067] The resetting telescopic cylinder 214 is reset, and the swinging member 231 is reset.

[0068] A small air compressor is installed between the truck body 11 and the mobile base 12 to provide gas to the cylinder.

[0069] like Fig.13 As shown, when the longitudinal steel pipe needs to be installed, the discharging drum 41 rotates toward the inside of the truck bed 11, and the steel pipe 5 to be installed falls onto the buffer plate 314 and then falls onto the steel pipe support roller table composed of the guide rollers 32. The construction workers can directly use the docking fasteners to connect the steel pipe 5 to be installed and the longitudinal steel pipe together.

[0070] The description of the direction and relative position relationship of the structure in the present invention, such as the description of front, back, left, right, up, and down, does not constitute a limitation of the present invention, but is only for the convenience of description.

Claims

1. A construction device for building a load-bearing layer of an external wall scaffolding of a building, characterized in that: include, The transport assembly (1) comprises a mobile base (12), the mobile base (12) being provided with a width-adjustable bucket (11), the bottom of the bucket (11) being provided with an inclined guide surface (111), the guide surface (111) extending from high to low toward both sides of the bucket (11), and both sides of the bucket (11) being provided with a discharging assembly (4), a positioning assembly (3) and a turning assembly (2); A discharge assembly (4) comprises discharge drums (41) respectively mounted on both sides of the bucket (11); a drive mechanism I (42) is mounted at the end of the bucket (11) corresponding to the discharge drum (41); an output end of the drive mechanism I (42) is connected to the discharge drum (41); The positioning assembly (3) comprises positioning frames (31) respectively mounted on both sides of the truck bucket (11), wherein the positioning frames (31) are respectively provided with steel pipe positioning grooves (312) and steel pipe support rollers corresponding to the pipe outlet positions of the discharging drum (41); The flip assembly (2) comprises a flip bracket (22) respectively mounted on both sides of the truck bucket (11), a clamping mechanism (21) being mounted on the flip bracket (22), the clamping mechanism (21) being arranged corresponding to the positioning groove (312), a flip mechanism (23) being arranged on the flip bracket (22) at one end of the clamping mechanism (21), the flip mechanism (23) realizing secondary auxiliary locking of the clamping mechanism (21) by exerting a force on the steel pipe (5) to be mounted; The clamping mechanism (21) comprises a clamping frame (211), the clamping frame (211) is provided with a clamping groove (2111) corresponding to the clamping groove (2111), two clamping claws (212) are hingedly mounted in the clamping frame (211) corresponding to the clamping groove (2111) and used in coordination with each other, a return spring (215) is mounted between the two clamping claws (212), and a driving component (213) for controlling the clamping of the clamping claws (212) is provided at one end of the clamping frame (211); The clamping frame (211) is hingedly mounted on the flipping frame (22), and a resetting telescopic cylinder (214) is also hingedly connected between the flipping frame (22) and the clamping frame (211); The driving component (213) comprises a fixing frame (2131) installed inside the clamping frame (211); a parallelogram mechanism (2132) is hingedly provided inside the fixing frame (2131); a pushing column (2138) for controlling the movement of the parallelogram mechanism (2132) is provided inside the parallelogram mechanism (2132); a pull rod (2133) is connected to the pushing column (2138); the pull rod (2133) slides through the clamping frame (211); a support plate (2135) is provided at the end of the pull rod (2133) outside the clamping frame (211); a locking telescopic cylinder (2134) is installed on the support plate (2135); a locking plate (2137) for secondary auxiliary locking is provided on the support plate (2135); the locking plate (2137) is slidably provided on the support plate (2135); and one end of the locking plate (2137) is connected to the locking telescopic cylinder (2136); The turning mechanism (23) comprises a swinging member (231) hingedly mounted on the turning bracket (22), and a driving mechanism II (232) for driving the swinging member (231) to move is correspondingly provided on the turning bracket (22).

2. The construction device for building a load-bearing layer of a building exterior wall scaffold according to claim 1 is characterized in that: The swinging member (231) comprises a driving portion arranged in a cylindrical shape, a pushing portion extending outward is provided on the outer surface of the driving portion, and an elastic block (2313) is elastically provided at the end of the pushing portion.

3. The construction device for building a load-bearing layer of a building exterior wall scaffold according to claim 2 is characterized in that: The driving part is respectively mounted with an arc-shaped gear plate (2311) and an arc-shaped block (2312), and the output end of the driving mechanism II (232) is connected with a main gear matched with the arc-shaped gear plate (2311).

4. The construction device for building a load-bearing layer of a building exterior wall scaffold according to claim 1 is characterized in that: The steel pipe positioning groove (312) of the positioning frame (31) is arranged corresponding to the clamping groove (2111), and a positioning plate (311) is provided at one end of the positioning groove (312) located on the outside. The positioning plate (311) is used to block the steel pipe (5) to be installed, so that the steel pipe (5) to be installed enters the positioning groove (312).

5. The construction device for building a load-bearing layer of a building exterior wall scaffold according to claim 1, characterized in that: At least two groups of positioning frames (31) are provided on one side of the bucket (11), one group being arranged at a position close to the end of the bucket (11), and the other group being installed at a position close to one end of the bucket (11) close to the tipping assembly (2).

6. The construction device for building a load-bearing layer of an exterior wall scaffolding of a building construction according to claim 1, characterized in that: A plurality of guide rollers (32) are correspondingly mounted on the lower end of the positioning frame (31), and a plurality of guide rollers (32) are also mounted on the lower end of the turning bracket (22). The guide rollers (32) on the positioning frame (31) and the guide rollers (32) on the turning bracket (22) form a steel pipe support roller track.

7. The construction device for building a load-bearing layer of a building exterior wall scaffold according to claim 1, characterized in that: A slide rail (121) is installed on the movable base (12), a slider (112) is installed at the lower end of the truck bucket (11) corresponding to the slide rail (121), a transmission rod (122) is installed in the middle of the movable base (12), and threaded movable blocks are respectively provided on both sides of the transmission rod (122), and the movable blocks are respectively fixedly installed on the truck buckets (11) on both sides.

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