A tower crane for constructing a high-rise tower and its construction method

Abstract

The present invention relates to the field of construction, and particularly to a tower crane for constructing a high-rise tower platform and its construction method, including a machine position support system, a hydraulic power climbing system, a control system, and a top steel platform system. It is characterized in that: the machine position support system provides the main support function, the hydraulic power climbing system is sleeved on the machine position support system and moves up and down along the length direction of the machine position support system, the top steel platform system is arranged at the top of the machine position support system, the control system is used to control the power driving parts in each system, the machine position support system includes a central support scaffold and a plurality of edge support scaffolds, and the hydraulic power climbing system includes an annular support grid and a first lifting cage arranged around the annular support grid, solving the technical problem that the existing tower crane is difficult to adapt to the construction of the outer surface with a curved shape of the tower body when constructing an unconventional tower body.

Description

Technical Field

[0001] The present invention relates to the field of building construction, and in particular to a tower-building machine for constructing a high-rise tower and a construction method thereof. Background Art

[0002] With the development of society, existing buildings have unique shapes. Innovative designs that could only remain on design drawings in the past are gradually appearing in real life. However, buildings with relatively novel shapes often have the problem of greater construction difficulty. For example, buildings with tall cylindrical structures like the Guangzhou Tower have high construction technology requirements, great difficulty, and high safety management risks.

[0003] The invention patent with Chinese patent application number 202410914939.2 proposes a tower-building machine and a tower-building method, including a fixed frame, a support frame, a telescopic device, a suspension frame and a template. The support frame includes an intermediate frame, a side frame and a telescopic frame, wherein the intermediate frame is arranged above the fixed frame, and the two are connected by the telescopic device; the side frames are respectively arranged on both sides of the intermediate frame; the side frames are connected to the intermediate frame by the telescopic frame, and the length of the telescopic frame along the direction from the intermediate frame to the side frame is adjustable; a plurality of suspension frames are fixedly arranged on the bottom side of the side frame; and the template is fixedly arranged on the suspension frame. By setting up the telescopic frame, the invention can adjust the installation angle of the template only once by adjusting the length of the telescopic frame during the process of the tower-building machine building a special-shaped tower column with an outer diameter that uniformly decreases from bottom to top, thereby simplifying the construction process of the tower-building machine and improving the construction efficiency of the tower-building machine. The technical solution proposed in the above invention is mainly aimed at improving the telescopic frame of the tower construction crane, realizing a single adjustment of the template installation angle to simplify the process and improve efficiency. However, when the tower to be built is a side curved type building similar to the shape of the Guangzhou Tower, its side is similar to a "small waist" structure. Therefore, the conventional tower construction crane needs to continuously adjust the construction "aperture" during operation to meet construction needs. On the one hand, it is time-consuming and labor-intensive, and on the other hand, it has high structural requirements. At the same time, it is difficult to achieve the functions of lightweight, self-lifting, and easy disassembly. Summary of the Invention

[0004] Therefore, in response to the above problems, the present invention proposes a tower-building machine for constructing a tall tower and a construction method thereof, which solves the technical problem that existing tower-building machines are difficult to adapt to the construction of the curved outer surface of the tower when carrying out unconventional tower construction.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A tower crane for constructing a high-rise tower includes a machine position support system, a hydraulic power climbing system, a control system, and a top steel platform system. The machine position support system provides the main support function. The hydraulic power climbing system is sleeved on the machine position support system and moves up and down along the length direction of the machine position support system. The top steel platform system is arranged at the top of the machine position support system. The control system is used to control the power driving components in each system. The machine position support system includes a central support scaffold and a number of edge support scaffolds. The hydraulic power climbing system includes an annular support grid and a first lifting cage arranged around the annular support grid;

[0006] The top steel platform system includes a circular construction grid and a second lifting cage arranged on the circular construction grid. The second lifting cage is arranged around the outer edge of the circular construction grid;

[0007] Hydraulic lifters are arranged in both the first lifting cage and the second lifting cage. The lifting and lowering of the annular support grid and the rising of the circular construction grid are controlled by the hydraulic lifters. An activity working platform for external construction of the building is movably arranged on the annular support grid. During the construction process, the activity working platform is adjusted adaptively according to the outer wall diameter.

[0008] Further, each of the edge support scaffolds is evenly arranged around the central support scaffold, and the circumferential distance between adjacent two edge support scaffolds is the same.

[0009] Further, the first lifting cage is fixedly connected to the annular support grid. The activity working platform moves horizontally in parallel and approaches or moves away from the building through a hydraulic push rod. During the construction of the building outer wall, the activity working platform always abuts against the building outer wall. A mobile support device is arranged on the activity working platform.

[0010] Further, the mobile support device includes a fixed sleeve cage arranged at the end of the free end of the activity working platform, a transfer gear arranged in the fixed sleeve cage, a first auxiliary support plate and a second auxiliary support plate arranged in the fixed sleeve cage. A transmission cavity is arranged in the fixed sleeve cage. The transmission cavity is parallel to the horizontal plane. The first auxiliary support plate is arranged in the transmission cavity and displaces in the transmission cavity, and the stroke is limited by the transmission cavity. A first meshing tooth is arranged on the first auxiliary support plate. The first auxiliary support plate is meshed and connected with the transfer gear through the first meshing tooth. The second auxiliary support plate is fixedly connected to the transfer gear and deflects following the rotation of the transfer gear. The rotation mode of the transfer gear includes being driven to rotate by the first meshing tooth on the first auxiliary support plate and being driven to rotate by a rotary motor.

[0011] Furthermore, the second auxiliary support plate is provided with connecting rods, the connecting rods are fixedly provided on both sides of the second auxiliary support plate, and the second auxiliary support plate is fixedly connected to the transfer gear through the connecting rods.

[0012] Furthermore, a first elastic support device is provided at the free end of the first auxiliary support plate, and when the first auxiliary support plate is against the outer surface of the building, the first elastic support device provides a reverse thrust for the first auxiliary support plate.

[0013] Furthermore, the first elastic support device includes a plurality of elastic support rods. In an initial state, the elastic support rods are in the same horizontal plane. The elastic support rods work independently, retract inwards when subjected to force, and pop outwards when the force is lost.

[0014] Furthermore, a second elastic support device is provided at the free end of the second auxiliary support plate, and the second elastic support device includes a circular support protrusion and a pressure sensor arranged in the circular support protrusion, and the circular support protrusion elastically expands and contracts when subjected to force; in the unstressed state, the height of the pressure sensor is lower than the height of the convex edge of the circular support protrusion, and the pressure sensor is connected to the switch of the hydraulic push rod.

[0015] A construction method for a tower crane for building a high-rise tower comprises the following steps:

[0016] S1. Pre-buried machine support system: After the basement structure is completed, the external protection bracket is installed, and the upper main structure is constructed, and the machine support system is installed at the same time;

[0017] S2. Installation of the hydraulic power climbing system: connecting the first lifting cage in the hydraulic power system and the edge support scaffold in the machine support system by mutually sleeved connection;

[0018] S3. Installation of the top steel platform system: The top steel platform system is installed when the main structure of the building is constructed to the third floor. The top steel platform system and the machine support system are assembled, and the second lifting cage and the central support scaffolding and edge support scaffolding are installed. At the same time, the tower crane is tested;

[0019] S4, wall-attached installation: As the top steel platform system continues to rise, it is installed on the wall between the building;

[0020] S5, exterior wall construction: The hydraulic climbing system rises along with the top steel platform system. After the main building is completed, the hydraulic climbing system descends and the exterior wall construction is carried out from top to bottom.

[0021] S6. Completed disassembly: Use the tower crane to dismantle the top steel platform system, machine support system, and hydraulic climbing system.

[0022] Furthermore, in step S5, during the exterior wall construction process, the movable working platform in the hydraulic climbing system is pushed outward by the action of the hydraulic push rod, approaches the exterior wall of the building and establishes a connection with the exterior wall of the building. As the hydraulic climbing system rises and falls, the movable working platform is reconnected with the exterior wall of the building, and each first elastic support rod independently extends and contracts to fit the curved surface of the exterior wall of the building.

[0023] By adopting the above technical solution, the beneficial effects of the present invention are:

[0024] 1. The present invention solves the technical problem that existing tower construction cranes are difficult to adapt to the construction of the curved outer surface of the tower body when carrying out unconventional tower construction through the mutual cooperation of the machine support system, the hydraulic power climbing system, the control system and the top steel platform system. The hydraulic power climbing system and the top steel platform system are respectively lifted up and down by the first lifting cage and the second lifting cage to construct the tower building; the work efficiency is improved. At the same time, the machine support system adopts the cooperation mode of the central support scaffolding and the edge support scaffolding. The edge support scaffolding is arranged around the central support scaffolding, which is more suitable for the construction of cylindrical towers.

[0025] 2. Conventional tower construction machines are usually only suitable for cylindrical towers with low heights when performing construction operations. When facing the "small waist" design with curved sides at higher heights, its movable working platform is difficult to adapt to the curved sides of the tower building in real time and thus achieve a stable fit with the tower building. If the movable working platform and the building are not stably matched, it will be difficult to carry out efficient construction. At the same time, there are risks for construction workers during the exterior wall construction process. Therefore, when encountering buildings with curved exterior walls, the industry generally adopts the method of replacing the annular support grid as a whole or adding an extension plate between the movable working platform and the tower building. Both of the above methods have disadvantages, specifically: the exterior wall construction requires continuity, and the annular support grid is frequently replaced during the construction process. On the one hand, the grid is time-consuming and labor-intensive, and on the other hand, it is difficult to ensure construction continuity. If an extension plate is set on the movable working platform, it is difficult to ensure the connection stability between the extension plate and the outer wall of the building. Moreover, the extension plate is an additional component, and its connection integrity with the movable working platform is slightly poor, which may easily lead to risks during the construction process. The present invention, on the other hand, is provided with a mobile support device on the movable working platform, and the connection relationship between the movable working platform and the outer wall of the building is adjusted by the mobile support device to achieve a real-time close fitting connection. At the same time, the mobile support device can provide the movable working platform with stronger support stability, thereby ensuring that the movable working platform can have a greater load-bearing performance, and thus can prevent more materials at a single time, thereby improving work efficiency.

[0026] 3. The advantage of the mobile support device in the present invention is that it achieves the expected purpose through the mutual cooperation of the first auxiliary support plate and the second auxiliary support plate, specifically: the first auxiliary support plate serves as the main support plate, connecting the movable working platform and the outer wall of the building, and is pressed against the outer wall of the building by telescopic extension. According to the tower building with different outer diameters and constantly changing heights, the first auxiliary support plate can always press against the outer wall of the building and cooperate with it firmly. When the first auxiliary support plate presses against the outer wall of the building, the second auxiliary support plate is simultaneously flipped to press against the outer wall of the building in an inclined state, ensuring that the first auxiliary support plate, the second auxiliary support plate and the outer wall of the building together form a triangular stable structure; at the same time, the triangular stable structure is not a traditional support frame structure, and its differences are as follows: Surface: The free end of the first auxiliary support plate is provided with a first elastic device, which can closely fit the curved exterior wall of the building; when the hydraulic push rod pushes the movable working platform outward until the first auxiliary support plate is against the exterior wall of the building, it continues to push outward until the second auxiliary support plate is also against the exterior wall of the building. When the pressure sensor on the second auxiliary support plate reaches a preset value, the switch of the hydraulic push rod is controlled to stop the hydraulic push rod from working. Although the hydraulic push rod stops working at this time, the free end of the first auxiliary support plate is still subject to the elastic force of the first elastic support device and will not loosen from the exterior wall of the building, and there is an interaction force between the two; the free end of the second auxiliary support plate will also not loosen from the exterior wall of the building under the elastic force of the second elastic support device, and there is also an interaction force between the two.

[0027] 4. At the same time, in the present invention, when the movable working platform is pushed outward until the first auxiliary support plate is against the outer wall of the building, the transfer gear does not actively rotate. Only when it is necessary to release the connection with the outer wall of the building, the first auxiliary support plate is driven to retract inward by the rotating motor.

[0028] 5. In the construction method adopted by the present invention, through the adaptive matching connection of the building exterior wall in step S5, the arc-shaped fitting of the building exterior wall is performed by independently extending and retracting each first elastic support rod, thereby ensuring the tightness of the fit and stronger integrity. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 This is a plan view of the aircraft support system distribution in the present invention;

[0032] Figure 3Schematic diagram of the planar structure of the annular support grid in the present invention;

[0033] Figure 4 Schematic diagram of the internal structure of the mobile support device in the present invention;

[0034] Figure 5 is Figure 4 the enlarged view at location A in

[0035] Figure 6 Schematic diagram of the structure of the second auxiliary support plate in the present invention;

[0036] Figure 7 Schematic diagram of the working state of the first elastic support device in the present invention;

[0037] Figure 8 Flow chart of the working method of the present invention. Detailed implementation manners

[0038] [[ID=,]]To make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific implementation manners.

[0039] Please refer to Figures 1 - 8 , the present invention provides a tower crane for constructing a high-rise tower platform, including a machine position support system, a hydraulic power climbing system, a control system and a top steel platform system. The machine position support system provides the main support function. The hydraulic power climbing system is sleeved on the machine position support system and moves up and down along the length direction of the machine position support system. The top steel platform system is arranged at the top of the machine position support system. The control system is used to control the power driving parts in each system. The machine position support system includes a central support scaffold 1 and 6 edge support scaffolds 2. The hydraulic power climbing system includes an annular support grid 3 and a first lifting cage 31 arranged around the annular support grid 3. The number of the first lifting cages 31 is the same as that of the edge support scaffolds 2;

[0040] The top steel platform system includes a circular construction grid 4 and a second lifting cage 41 arranged on the circular construction grid 4. The second lifting cage 41 is arranged around the outer edge of the circular construction grid 4;

[0041] Hydraulic lifters are arranged in both the first lifting cage 31 and the second lifting cage 41. The lifting of the annular support grid 3 and the rising of the circular construction grid 4 are controlled by the hydraulic lifters. An activity working platform 5 for external construction of the building is movably arranged on the annular support grid 3. During the construction process, the activity working platform 5 is adjusted adaptively according to the outer wall diameter.

[0042] Among them, the hydraulic lifter is a well-known structural component used to drive the lifting of the first lifting cage 31 and the second lifting cage 41, and the annular support grid 3 is not connected to the central support scaffolding 1.

[0043] Each of the edge support scaffolding 2 is uniformly arranged around the central support scaffolding 1, and the circumferential distance between two adjacent edge support scaffolding 2 is the same. The first lifting cage 31 is fixedly connected to the annular support grid 3. The movable working platform 5 moves parallel in the horizontal direction, approaches or moves away from the building through the hydraulic push rod. During the construction of the building exterior wall, the movable working platform 5 always abuts against the building exterior wall, and a movable support device is arranged on the movable working platform 5.

[0044] The movable support device includes a fixed sleeve cage 51 arranged at the end of the free end of the movable working platform 5, a transfer gear 54 arranged in the fixed sleeve cage 51, a first auxiliary support plate 52 and a second auxiliary support plate 53 arranged in the fixed sleeve cage 51. A transmission cavity 511 is arranged in the fixed sleeve cage 51, and the transmission cavity 511 is parallel to the horizontal plane. The first auxiliary support plate 52 is arranged in the transmission cavity 511 and displaces in the transmission cavity 511, and its stroke is limited by the transmission cavity 511 . A first meshing tooth 522 is arranged on the first auxiliary support plate 52, and the first auxiliary support plate 52 is meshed and connected to the transfer gear 54 through the first meshing tooth 522. The second auxiliary support plate 53 is fixedly connected to the transfer gear 54 and deflects following the rotation of the transfer gear 54. The rotation mode of the transfer gear 54 includes being driven to rotate by the first meshing tooth 522 on the first auxiliary support plate 52 and being driven to rotate by a rotating motor. The rotating motor is a well-known device and can provide two rotation forms: forward rotation or reverse rotation.

[0045] A connecting rod 532 is arranged on the second auxiliary support plate 53, and the connecting rod 532 is fixedly arranged on both sides of the second auxiliary support plate 53. The second auxiliary support plate 53 is fixedly connected to the transfer gear 54 through the connecting rod 532. A first elastic support device 521 is arranged at the end of the free end of the first auxiliary support plate 52. When the first auxiliary support plate 52 abuts against the outer surface of the building, the first elastic support device 521 provides a reverse thrust for the first auxiliary support plate 52 to enhance its connection with the building exterior wall. The first elastic support device 521 includes a plurality of elastic support rods. In the initial state, each of the elastic support rods is on the same horizontal plane, and each of the elastic support rods works independently, retracting inward under force and popping outward when the force is lost.

[0046] A second elastic support device 531 is provided at the free end of the second auxiliary support plate 53. The second elastic support device 531 includes a circular support protrusion and a pressure sensor 6 arranged in the circular support protrusion. The circular support protrusion elastically expands and contracts when subjected to force. In the unstressed state, the height of the pressure sensor 6 is lower than the height of the convex edge of the circular support protrusion, and the pressure sensor 6 is connected to the switch of the hydraulic push rod.

[0047] The present invention simultaneously proposes a construction method of the tower crane, a construction method of a tower crane for building a high tower, comprising the following steps:

[0048] S1. Pre-buried machine support system: After the basement structure is completed, the external protection bracket is installed, and the upper main structure is constructed, and the machine support system is installed at the same time;

[0049] S2, hydraulic power climbing system installation; by the hydraulic power system of the first lifting cage 31 and the machine support system edge support scaffolding 2 are connected to each other;

[0050] S3, top steel platform system installation: The top steel platform system is installed when the main structure of the building is constructed to the third floor. The top steel platform system and the machine support system are assembled, the second lifting cage 41 and the center support scaffolding 1 and the edge support scaffolding 2 are installed, and the whole tower crane is tested at the same time;

[0051] S4, wall-attached installation: As the top steel platform system continues to rise, it is installed on the wall between the building;

[0052] S5, exterior wall construction: The hydraulic climbing system rises along with the top steel platform system. After the main building is completed, the hydraulic climbing system descends and the exterior wall construction is carried out from top to bottom.

[0053] S6. Completed disassembly: Use the tower crane to dismantle the top steel platform system, machine support system, and hydraulic climbing system.

[0054] Among them, in step S5, during the exterior wall construction process, the movable working platform 5 in the hydraulic power climbing system is pushed outward under the action of the hydraulic push rod, close to the exterior wall of the building and establishes a connection with the exterior wall of the building. As the hydraulic power climbing system rises and falls, the movable working platform 5 is reconnected with the exterior wall of the building, and each first elastic support rod independently extends and contracts to fit the curved surface of the exterior wall of the building.

[0055] The foregoing has shown and described the basic principles, main features and advantages of the present invention. For a person skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic features of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes that fall within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0056] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. A person skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by a person skilled in the art.

Claims

1. A tower crane for constructing a high-rise tower platform, comprising a machine position support system, a hydraulic power climbing system, a control system and a top steel platform system, characterized in that: The aircraft support system provides the main support function. The hydraulic climbing system is mounted on the aircraft support system and moves up and down along the length of the aircraft support system. The top steel platform system is arranged at the top of the aircraft support system. The control system is used to control the power drive components in each system. The aircraft support system includes a central support scaffolding and a plurality of edge support scaffoldings. The hydraulic climbing system includes an annular support grid and a first lifting cage arranged around the annular support grid. The top steel platform system includes a circular construction grid and a second lifting cage arranged on the circular construction grid, wherein the second lifting cage is arranged around the outer edge of the circular construction grid; The first and second lifting cages are both equipped with hydraulic lifters, which control the lifting and lowering of the annular support grid and the ascent of the circular construction grid. A movable working platform for exterior construction of the building is movably provided on the annular support grid. During the construction process, the movable working platform is adaptively adjusted according to the diameter of the exterior wall. The edge support scaffolds are evenly arranged around the central support scaffold, and the circumferential distance between two adjacent edge support scaffolds is the same; The first lifting cage is fixedly connected to the annular support grid, and the movable working platform moves horizontally and parallel to the building through the hydraulic push rod, so that the movable working platform always rests against the building's outer wall during the construction of the building's outer wall. The movable working platform is provided with a movable support device; The mobile support device includes a fixed cage arranged at the free end of the movable working platform, a transfer gear arranged in the fixed cage, a first auxiliary support plate and a second auxiliary support plate arranged in the fixed cage, a transmission cavity is provided in the fixed cage, the transmission cavity is parallel to the horizontal plane, the first auxiliary support plate is arranged in the transmission cavity and displaces in the transmission cavity, and the stroke is limited by the transmission cavity, the first auxiliary support plate is provided with a first meshing tooth, the first auxiliary support plate is meshed with the transfer gear through the first meshing tooth, the second auxiliary support plate is fixedly connected to the transfer gear and deflects following the rotation of the transfer gear, and the rotation mode of the transfer gear includes being driven by the first meshing tooth on the first auxiliary support plate and being driven by the rotary motor.

2. The tower crane for constructing a high-rise tower platform according to claim 1, characterized in that: The second auxiliary support plate is provided with connecting rods, the connecting rods are fixedly provided on both sides of the second auxiliary support plate, and the second auxiliary support plate is fixedly connected to the transfer gear through the connecting rods.

3. The tower crane for constructing a high-rise tower platform according to claim 2, wherein: A first elastic support device is provided at the free end of the first auxiliary support plate. When the first auxiliary support plate abuts against the outer surface of the building, the first elastic support device provides a reverse thrust for the first auxiliary support plate.

4. The tower crane for constructing a high-rise tower according to claim 3, characterized in that: The first elastic support device includes a plurality of elastic support rods. In an initial state, the elastic support rods are located in the same horizontal plane. The elastic support rods work independently, retract inwards when subjected to force, and pop outwards when the force is lost.

5. The tower crane for constructing a high-rise tower platform according to claim 4, characterized in that: A second elastic support device is provided at the free end of the second auxiliary support plate, the second elastic support device comprising a circular support protrusion and a pressure sensor provided in the circular support protrusion, wherein the circular support protrusion elastically expands and contracts when subjected to force; In an unstressed state, the height of the pressure sensor is lower than the height of the convex edge of the circular supporting protrusion, and the pressure sensor is connected to the switch of the hydraulic push rod.

6. A construction method of a tower crane for constructing a high-rise tower platform as described in claim 5, characterized in that: The following steps are involved: S1. Pre-buried machine support system: After the basement structure is completed, the external protection bracket is installed, and the upper main structure is constructed, and the machine support system is installed at the same time; S2. Installation of the hydraulic power climbing system: connecting the first lifting cage in the hydraulic power system and the edge support scaffold in the machine support system by mutually sleeved connection; S3. Installation of the top steel platform system: The top steel platform system is installed when the main structure of the building is constructed to the third floor. The top steel platform system and the machine support system are assembled, and the second lifting cage and the central support scaffolding and edge support scaffolding are installed. At the same time, the tower crane is tested; S4, wall-attached installation: As the top steel platform system continues to rise, it is installed on the wall between the building; S5, exterior wall construction: The hydraulic climbing system rises along with the top steel platform system. After the main building is completed, the hydraulic climbing system descends and the exterior wall construction is carried out from top to bottom. S6. Completed disassembly: Use the tower crane to dismantle the top steel platform system, machine support system, and hydraulic climbing system.

7. The construction method of a tower crane for constructing a high-rise tower platform according to claim 6, characterized in that: In step S5, during the exterior wall construction process, the movable working platform in the hydraulic climbing system is pushed outward by the action of the hydraulic push rod, approaches the exterior wall of the building and establishes a connection with the exterior wall of the building. As the hydraulic climbing system rises and falls, the movable working platform is reconnected with the exterior wall of the building, and each first elastic support rod independently extends and contracts to fit the curved surface of the exterior wall of the building.

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