A large plate beam non-destructive turning auxiliary support device and construction method

Abstract

The present application relates to an auxiliary support device and construction method for non-destructive turning over of a large plate beam. The auxiliary support device includes a base, a tripod, a tensioning assembly, and a fixing assembly. The top of the base is provided with a support groove that matches a corner of the tripod. One side of the tripod is hinged to the top of the base. When the tripod is flipped into the support groove, the side of the tripod away from the support groove is parallel to the bottom surface of the base. The angle of the corner of the tripod extending into the support groove is not less than 90°. The fixing assembly is provided at a corner of the tripod close to the hinged edge and away from the support groove. The fixing assembly is used to connect and fix the lower flange on one side of the large plate beam. The tensioning assembly is provided at the other corner of the tripod away from the support groove. The tensioning assembly is used to tension and fix the middle part of the web on the other side of the large plate beam. The present application has the effect of preventing damage to the large plate beam when it is turned over.

Description

Technical Field

[0001] The present application relates to the technical field of large plate beam installation, and in particular to a non-destructive turning auxiliary support device for large plate beams and a construction method. Background Art

[0002] Large plate beams are an integral part of the boiler steel structure. They are large plate structure beams used to suspend the main weight at the top of the boiler frame and transmit force to the boiler columns. In recent years, with the continuous commissioning of ultra-supercritical thermal power units, the tonnage and volume of large plate beams of boiler steel structures have also increased, making it increasingly difficult for factories to manufacture large plate beams. Boiler large plate beams have the characteristics of heavy weight, high web height, and high installation height.

[0003] At present, when transporting large plate beams, due to road height restrictions, lowering the center of gravity, etc., they are generally transported in a horizontal position; after being transported to the site, the large plate beams are turned over, and then welding, assembly, etc. are carried out on them; currently, it is usually necessary to install lifting ears on the large plate beams and then use crane equipment to turn them over. If the structural deformation that occurs during the turning process of the large plate beams cannot be controlled, it will seriously affect the flatness, verticality and perforation rate of the large plate beams.

[0004] Regarding the above-mentioned related technologies, the inventors believe that the following defects exist: during the turning and erection process, a lifting lug is usually installed on one side of the large plate beam for lifting and turning. This not only easily causes deformation of the beam body, but also causes problems such as damage to the paint on the lower flange of the large plate beam, resulting in the need for repair and correction at a later stage. Summary of the Invention

[0005] In order to solve the above problems and avoid damage to the large plate beam when it is turned over, the present application provides a large plate beam non-destructive turning auxiliary support device and construction method.

[0006] In a first aspect, the present application provides a non-destructive turning auxiliary support device for a large plate beam, which adopts the following technical solution:

[0007] A non-destructive turning auxiliary support device for a large plate beam comprises a base, a tripod, a tensioning assembly and a fixing assembly, wherein the top of the base is provided with a support groove matching a corner of the tripod, and one side of the tripod is hinged to the top of the base. When the tripod is flipped into the support groove, the side of the tripod away from the support groove is parallel to the bottom surface of the base, and the angle of the tripod extending into the corner of the support groove is not less than 90°. The fixing assembly is arranged at a corner of the tripod close to the hinged edge and away from the support groove. The fixing assembly is used to connect and fix the lower flange on one side of the large plate beam, and the tensioning assembly is arranged at the other corner of the tripod away from the support groove. The tensioning assembly is used to tension and fix the middle part of the web on the other side of the large plate beam.

[0008] By adopting the above technical solution, after the large plate beam is transported to the construction site, the lower flange of the large plate beam is connected and fixed to the tripod through the fixing assembly and the tensioning assembly, so that the large plate beam and the tripod are connected as a whole. When the upper flange of the large plate beam is lifted by the lifting device, the large plate beam is turned over, and the large plate beam is supported by the tripod and the base, which can effectively avoid deformation of the lower flange of the large plate beam and damage to the paint; effectively protect the large plate beam from damage. When the large plate beam is turned over, it is supported by the base and the tripod to achieve the effect of fixing the large plate beam, thereby facilitating subsequent construction such as assembly and welding of the large plate beam.

[0009] Optionally, the fixing assembly includes a fixed wing plate, a pressure plate and a fixing stud. The fixed wing plate is arranged on the tripod. A limiting groove is provided on the side of the fixed wing plate close to the tensioning assembly. The fixing stud is threadedly connected to the fixed wing plate, and the fixing stud extends into the limiting groove. The pressure plate is rotatably connected to one end of the fixing stud extending into the limiting groove.

[0010] By adopting the above technical solution, when connecting the lower flange of the large plate beam, the lower flange of the large plate beam is extended into the limit groove, and then the fixing stud is rotated to drive the pressure plate to clamp and fix it, so as to achieve the connection and fixation of one side of the lower flange of the large plate beam, and achieve the protection effect of the lower flange of the large plate beam when the large plate beam is turned over.

[0011] Optionally, the tensioning assembly includes a hanging ear, a hook and a tensioning member, the hanging ear is provided on the tripod, the hook is used to connect to the stiffening rib in the middle of the web of the large plate beam, one end of the tensioning member is connected to the hanging ear, and the other end is connected to the hook, and the tensioning member is used to tension and fix the hanging ear and the hook.

[0012] By adopting the above technical solution, when fixing the large plate beam and the tripod, the plate beam is tensioned and fixed by the tensioning member under the action of the hanging ear and the hook, thereby achieving a connection and fixing effect on the other side of the web of the large plate beam, and completing the fixed connection effect of the large plate beam and the tripod by cooperating with the fixing assembly.

[0013] Optionally, a fixing member is provided between the side of the tripod away from the hinged side and the base, and the fixing member is used to fix the tripod and the base.

[0014] By adopting the above technical solution, when the large plate beam is turned over, the tripod and the base are fixed by the fixing parts, which further improves the support stability of the large plate beam, and further improves the construction safety during subsequent welding, assembly and other construction.

[0015] Optionally, the auxiliary support device also includes a limiting assembly, which includes a winding roller, a pull rope, a fixing hook and a locking piece. The winding roller is rotatably connected to the tripod, the pull rope is wound around the winding roller, and the fixing hook is provided at the end of the pull rope. A through hole is provided on one side of the tripod away from the support groove, and the fixing hook can drive the pull rope to extend out of the through hole. The locking piece is provided in the tripod for locking and fixing the winding roller.

[0016] By adopting the above technical solution and setting a limit assembly, after the large plate beam is turned over, when subsequent assembly construction is required, the fixing hook can be fixed on the large plate beam. During the lifting process of the large plate beam, the large plate beam can be pulled and restricted to a certain extent under the action of the pull rope. During the process of the winding roller paying out the wire, the locking member can effectively lock the winding roller to avoid excessive paying out of the wire. When strong winds are encountered during the lifting process, the effective pulling effect of the pull rope on the large plate beam can reduce the shaking of the large plate beam and avoid safety accidents.

[0017] Optionally, the locking member includes a supporting plate, a support block, an elastic member, a latch and a tooth plate, the supporting plate is arranged in the tripod, a sliding groove is provided on the supporting plate in the vertical direction, the support block is slidably connected in the sliding groove, the elastic member is used to drive the support block to press against the bottom of the sliding groove, the rotating shaft of the winding roller passes through the support block and is rotatably connected to the support block, the latch is provided on the end of the rotating shaft of the winding roller, the tooth plate is provided on the supporting plate above the support block, and a latch groove matching the latch is provided on the side of the tooth plate close to the rotating shaft of the winding roller.

[0018] By adopting the above technical solution, since the installation height of the large plate beam is relatively high, during the assembly and lifting of the large plate beam, the large plate beam is pulled and fixed at the bottom by a pull rope. When a strong wind suddenly occurs and causes the large plate beam to swing violently, the large plate beam will suddenly pull the pull rope. Under the strong force, the support block will overcome the force of the spring and move upward. When the support block moves upward, it drives the winding roller shaft to move upward. When the tooth on the winding roller shaft engages with the groove on the tooth plate, the winding roller can be locked, resulting in the winding roller being unable to rotate to release the wire. Then, the pull rope can be used to achieve a good pulling effect on the large plate beam, thereby avoiding large swings of the large plate beam in sudden strong winds.

[0019] Optionally, a plurality of walking parts are provided at the bottom of the base.

[0020] By adopting the above technical solution and arranging a walking part at the bottom of the base, after the large plate beam is turned over, when assembly is required, the large plate beam can be moved again according to the assembly position, thereby improving assembly efficiency.

[0021] In a second aspect, the present application provides a construction method for non-destructive turning of a large plate beam, which adopts the following technical solution:

[0022] A construction method for non-destructive turning of a large plate beam comprises the following steps:

[0023] S1: Move the large plate girder non-destructive turning auxiliary support device to the lower flange of the horizontal large plate girder, connect and fix the lower flange of the large plate girder through the fixing assembly, and connect the tensioning assembly to the middle part of the large plate girder web;

[0024] S2: Install multiple large plate beam non-destructive turning auxiliary support devices at intervals along the lower flange of the large plate beam;

[0025] S3: Install the lifting lug on one side of the upper flange of the large plate beam;

[0026] S4: The lifting device lifts the large plate beam through the lifting lugs, so that the large plate beam drives the tripod to flip over until the tripod flips over into the support groove, thus completing the flipping construction of the large plate beam.

[0027] By adopting the above technical solution and construction method, which are easy to operate and simple in structure, the problems of deformation, paint damage, and weld tearing caused during the turning process of the large plate beam are avoided, effectively ensuring the installation quality of the large plate beam. Furthermore, the correction, repainting, and repair work caused by deformation, paint damage, and weld tearing during the turning process are effectively avoided, thereby improving the safe operation of the large plate beam turning process and reducing the workload of the large plate beam correction in the later stage, thereby greatly saving costs.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The auxiliary support device includes a base, a tripod, a tensioning assembly, and a fixing assembly. The fixing assembly and the tensioning assembly connect and fix the lower flange of the large plate beam to the tripod. When the large plate beam is turned over, the tripod and the base support the large plate beam, which can effectively prevent the deformation of the lower flange of the large plate beam and damage to the paint.

[0030] 2. By setting up a limit assembly including a winding roller, a pull rope, a fixing hook and a locking piece, the pull rope can play a certain pulling and limiting effect on the large plate beam during subsequent assembly construction. The locking piece can effectively lock the winding roller to prevent the winding roller from excessively paying out the wire. When encountering strong winds, the shaking of the large plate beam can be reduced to avoid safety accidents.

[0031] 3. The construction method is easy to operate and has a simple structure. It avoids problems such as deformation, paint damage, and weld tearing caused by the turning process of the large plate beam, effectively ensures the installation quality of the large plate beam, improves the safe operation during the turning process of the large plate beam, and reduces the workload of the later correction of the large plate beam, thereby greatly saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a non-destructive turning auxiliary support device for a large plate beam according to an embodiment of the present application.

[0033] Figure 2 yes Figure 1 Enlarged schematic diagram of part A.

[0034] Figure 3 This is a schematic diagram of the connection between a large plate beam non-destructive turning auxiliary support device and a large plate beam in a horizontal state in an embodiment of the present application.

[0035] Figure 4 This is a schematic diagram of the connection between a large plate beam non-destructive turning auxiliary support device and a large plate beam in an upright state in an embodiment of the present application.

[0036] Figure numerals: 1. base; 11. support groove; 2. tripod; 21. through hole; 3. tensioning assembly; 31. hanging ear; 32. hook; 33. tensioning member; 4. fixing assembly; 41. fixed wing plate; 411. limiting groove; 42. pressure plate; 43. fixing stud; 5. fixing member; 6. limiting assembly; 61. winding roller; 62. pull rope; 63. fixing hook; 64. locking member; 641. load-bearing plate; 642. support block; 643. elastic member; 644. tooth; 645. tooth plate; 646. slot; 647. sliding groove; 7. walking member. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-4 This application is described in further detail.

[0038] The embodiment of the present application discloses a large plate beam non-destructive turning auxiliary support device. Figure 1 The auxiliary support device includes a base 1, a tripod 2, a tensioning assembly 3, a fixing assembly 4 and a limiting assembly 6. A support groove 11 is provided on the top of the base 1 to match a corner of the tripod 2. One side of the tripod 2 is hinged to the top of the base 1, and the hinge axis is arranged along the notch edge of one side of the support groove 11. When the tripod 2 is flipped into the support groove 11, the side of the tripod 2 away from the support groove 11 is parallel to the bottom surface of the base 1, and the angle at which the tripod 2 extends into the corner of the support groove 11 is not less than 90°, which is 90° in this embodiment. In this embodiment, the tripod 2 is an isosceles right-angled tripod 2 with a cross-section. A number of walking parts 7 are installed at the bottom of the base 1. The several walking parts 7 are evenly distributed along both sides of the bottom of the base 1. The walking parts 7 are specifically ground tanks. When assembly is required, they can be conveniently moved again according to the assembly position.

[0039] Reference Figure 1The fixing assembly 4 is installed at a corner of the tripod 2 close to the hinged edge and away from the support groove 11. The fixing assembly 4 is used to connect and fix the lower flange of one side of the large plate beam. The fixing assembly 4 includes a fixing wing plate 41, a pressure plate 42 and a fixing stud 43. The fixing wing plate 41 is welded to the tripod 2. A limiting groove 411 is provided on the side of the fixing wing plate 41 close to the tensioning assembly 3. The fixing stud 43 is threadedly connected to the fixing wing plate 41, and the fixing stud 43 extends into the limiting groove 411. The pressure plate 42 is rotatably connected to one end of the fixing stud 43 extending into the limiting groove 411; by extending the lower flange of the large plate beam into the limiting groove 411, and then rotating the fixing stud 43 to drive the pressure plate 42 to clamp and fix it, the connection and fixation of one side of the lower flange of the large plate beam is achieved.

[0040] Reference Figure 1 The tensioning assembly 3 is installed at the other corner of the tripod 2 away from the support groove 11. The tensioning assembly 3 is used to tension and fix the middle part of the web on the other side of the large plate beam. The tensioning assembly 3 includes a hanging ear 31, a hook 32 and a tensioning member 33. The hanging ear 31 is welded to the tripod 2, and the hook 32 is used to connect with the stiffening rib in the middle part of the web of the large plate beam. The tensioning member 33 is specifically a fall chain. One end of the tensioning member 33 is connected to the hanging ear 31, and the other end is connected to the hook 32. The tensioning member 33 is used to tension and fix between the hanging ear 31 and the hook 32; under the action of the hanging ear 31 and the hook 32, it is tensioned and fixed through the tensioning member 33, and the connection on the other side of the web of the large plate beam is fixed, thereby completing the fixed connection between the large plate beam and the tripod 2.

[0041] Reference Figure 1 and Figure 2 In order to improve the safety of the large plate beam during installation, a limiting assembly 6 is provided, including a winding roller 61, a pull rope 62, a fixing hook 63 and a locking member 64. The winding roller 61 is horizontally rotatable and connected to the tripod 2. The pull rope 62 is wound on the winding roller 61. The fixing hook 63 is fixed to the end of the pull rope 62. A through hole 21 is provided on one side of the tripod 2 away from the support groove 11. The fixing hook 63 can drive the pull rope 62 to extend out of the through hole 21 and connect with the large plate beam. During assembly construction, by fixing the fixing hook 63 on the large plate beam, the effective pulling effect of the pull rope 62 on the large plate beam during the lifting of the large plate beam can reduce the shaking of the large plate beam.

[0042] The locking member 64 is installed in the tripod 2 to lock and fix the winding roller 61. The locking member 64 includes a supporting plate 641, a supporting block 642, an elastic member 643, a latch 644 and a tooth plate 645. The supporting plate 641 is welded in the tripod 2, and the supporting plate 641 and the three sides of the tripod 2 are welded, which can effectively improve the strength of the tripod 2. A sliding groove 647 is opened on the supporting plate 641 in the vertical direction, and the supporting block 642 is slidably connected in the sliding groove 647. The supporting block 642 can slide up and down along the sliding groove 647; the elastic member 643 is specifically a spring, and the elastic member 643 is used to drive the supporting block 642 to press against the bottom of the sliding groove 647. One end of the spring is fixedly connected to the top of the support block 642, and the other end is connected to the top of the sliding groove 647; the winding The rotating shaft of the wire roller 61 passes through the support block 642 and is rotatably connected to the support block 642. The locking teeth 644 are integrally connected to the circumferential side of the rotating shaft end of the winding roller 61. The tooth plate 645 is welded to the supporting plate 641 above the support block 642. A locking groove 646 that matches the locking teeth 644 is opened on the side of the tooth plate 645 close to the rotating shaft of the winding roller 61; when the large plate beam is assembled and lifted, when strong winds suddenly occur and the large plate beam is driven to swing violently, the large plate beam will suddenly pull the pull rope 62, and the support block 642 moves upward to drive the rotating shaft of the winding roller 61 to move upward. When the locking teeth 644 on the rotating shaft of the winding roller 61 are engaged with the locking groove 646 on the tooth plate 645, the winding roller 61 can be locked, and then the large plate beam can be pulled well by the pull rope 62.

[0043] Reference Figure 3 A fixing part 5 is installed between the side of the tripod 2 away from the hinged side and the base 1. The fixing part 5 is used to fix the tripod 2 and the base 1. The fixing part 5 includes a connecting plate and a bolt. The connecting plate is welded to the side wall of the tripod 2, and the bolt passes through the connecting plate and is threadedly connected to the tripod 2. The fixing part 5 fixes the tripod 2 and the base 1, thereby further improving the support stability of the large plate beam.

[0044] The implementation principle of the non-destructive turning auxiliary support device for large plate beams in the embodiment of the present application is as follows: Figure 3 and Figure 4 After the large plate beam is transported to the construction site, the auxiliary support device is moved to the lower flange of the large plate beam through the walking member 7, the fixing member 5 is opened, and the tripod 2 is flipped over. The lower flange of the large plate beam is adjusted to extend into the limit groove 411, and then the pressing plate 42 is driven to clamp and fix it by rotating the fixing stud 43; then the hook 32 is used to connect with the stiffening rib in the middle of the web of the large plate beam, and it is tensioned and fixed by the tensioning member 33; finally, the main lifting lug is installed at the upper flange of the large plate beam, and the crane lifts and flips the large plate beam through the main lifting lug, so that the large plate beam drives the tripod 2 to flip into the support groove 11, and then the tripod 2 is fixed by the fixing member 5, thus completing the turning construction of the large plate beam.

[0045] When the large plate beam needs to be lifted and assembled, the fixing components 4 and the tensioning components 3 are opened to fix the large plate beam, and the lifting operation is performed by a crane, and the fixing hook 63 is fixed on the large plate beam. During the lifting process of the large plate beam, the pull rope 62 can exert a certain pulling restriction on the large plate beam, thereby reducing the shaking of the large plate beam and avoiding safety accidents.

[0046] The present application also discloses a construction method for non-destructive turning of a large plate beam, referring to Figure 3 and Figure 4 , using the above-mentioned large plate beam non-destructive turning auxiliary support device, including the following steps:

[0047] S1: Move the large plate beam non-destructive turning auxiliary support device to the lower flange of the horizontal large plate beam, connect and fix the lower flange of the large plate beam by adjusting the fixing component 4, and connect and fix the tensioning component 3 to the middle part of the web of the large plate beam;

[0048] S2: Install multiple large plate beam non-destructive turning auxiliary support devices at intervals along the lower flange of the large plate beam. In this embodiment, three are installed;

[0049] S3: Install the main lifting lug on one side of the upper flange of the large plate beam. Install multiple main lifting lugs evenly along the upper flange of the large plate beam.

[0050] S4: The crane lifts the large plate beam through the main lifting lug, so that the large plate beam drives the tripod 2 to slowly turn over until the tripod 2 turns over to the support groove 11, and then fixes the tripod 2 through the fixing member 5, thus completing the turning over construction of the large plate beam.

[0051] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A large plate beam non-destructive turning auxiliary support device, characterized by: The invention comprises a base (1), a tripod (2), a tensioning assembly (3) and a fixing assembly (4), wherein the top of the base (1) is provided with a supporting groove (11) which matches a corner of the tripod (2), one side of the tripod (2) is hinged to the top of the base (1), and when the tripod (2) is flipped into the supporting groove (11), the side of the tripod (2) away from the supporting groove (11) is parallel to the bottom surface of the base (1), and the angle of the corner of the tripod (2) extending into the supporting groove (11) is not less than 90°, and the fixing assembly (4) The fixing assembly (4) is arranged at a corner of the tripod (2) close to the hinged edge and away from the support groove (11), and is used to connect and fix the lower flange on one side of the large plate beam. The tensioning assembly (3) is arranged at the other corner of the tripod (2) away from the support groove (11), and is used to tension and fix the middle part of the web on the other side of the large plate beam. A fixing member (5) is provided between the side of the tripod (2) away from the hinged edge and the base (1), and the fixing member (5) is used to fix the tripod (2) and the base (1).

2. The large plate beam non-destructive turning auxiliary support device according to claim 1 is characterized in that: The fixing assembly (4) comprises a fixing wing plate (41), a pressure plate (42) and a fixing stud (43); the fixing wing plate (41) is provided on the tripod (2); a limiting groove (411) is provided on a side of the fixing wing plate (41) close to the tensioning assembly (3); the fixing stud (43) is threadedly connected to the fixing wing plate (41), and the fixing stud (43) extends into the limiting groove (411); the pressure plate (42) is rotatably connected to one end of the fixing stud (43) extending into the limiting groove (411).

3. The large plate beam non-destructive turning auxiliary support device according to claim 1 is characterized in that: The tensioning assembly (3) includes a hanging ear (31), a hook (32) and a tensioning member (33), wherein the hanging ear (31) is provided on the tripod (2), the hook (32) is used to be connected to the stiffening rib in the middle of the web of the large plate beam, one end of the tensioning member (33) is connected to the hanging ear (31), and the other end is connected to the hook (32), and the tensioning member (33) is used to tension and fix the hanging ear (31) and the hook (32).

4. The large plate beam non-destructive turning auxiliary support device according to claim 1 is characterized in that: The auxiliary support device also includes a limiting component (6), the limiting component (6) includes a winding roller (61), a pull rope (62), a fixing hook (63) and a locking member (64), the winding roller (61) is rotatably connected to the tripod (2), the pull rope (62) is wound on the winding roller (61), the fixing hook (63) is provided at the end of the pull rope (62), a through hole (21) is provided on one side of the tripod (2) away from the support groove (11), the fixing hook (63) can drive the pull rope (62) to extend out of the through hole (21), and the locking member (64) is provided in the tripod (2) for locking and fixing the winding roller (61).

5. The large plate beam non-destructive turning auxiliary support device according to claim 4 is characterized in that: The locking member (64) includes a supporting plate (641), a supporting block (642), an elastic member (643), a latching tooth (644) and a tooth plate (645). The supporting plate (641) is arranged in the tripod (2). A sliding groove (647) is provided on the supporting plate (641) along the vertical direction. The supporting block (642) is slidably connected to the sliding groove (647). The elastic member (643) is used to drive the supporting block (642) to slide with the supporting block (642). The shift groove (647) is pressed against the bottom, the rotating shaft of the winding roller (61) passes through the support block (642) and is rotatably connected to the support block (642), the latching tooth (644) is provided at the end of the rotating shaft of the winding roller (61), the tooth plate (645) is provided on the supporting plate (641) above the support block (642), and a latching groove (646) matching the latching tooth (644) is provided on the side of the tooth plate (645) close to the rotating shaft of the winding roller (61).

6. The large plate beam non-destructive turning auxiliary support device according to claim 1 is characterized in that: A plurality of walking parts (7) are provided at the bottom of the base (1).

7. A construction method for non-destructive turning of a large plate beam, characterized by: The non-destructive turning auxiliary support device for large plate beams according to any one of claims 1 to 6 is used, comprising the following steps: S1: Move the large plate beam non-destructive turning auxiliary support device to the lower flange of the horizontal large plate beam, connect and fix the lower flange of the large plate beam through the fixing component (4), and connect the tensioning component (3) to the middle part of the web of the large plate beam; S2: Install multiple large plate beam non-destructive turning auxiliary support devices at intervals along the lower flange of the large plate beam; S3: Install the lifting lug on one side of the upper flange of the large plate beam; S4: The lifting device lifts the large plate beam through the lifting lugs, so that the large plate beam drives the tripod (2) to turn over until the tripod (2) turns over into the support groove (11), thus completing the turning over construction of the large plate beam.

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