Assembled air duct mold

Abstract

The utility model aims to provide an assembled air duct mould, which aims to overcome the defects of inconvenience in installation and large workload caused by the fact that an air duct manufactured by a mould in the prior art needs to be turned over, the bottom of the air duct needs to be turned over to the lower part from the upper part and then is perforated for installation during field installation, and comprises a bottom mould, a side mould, an inner mould and an end mould, the bottom die is provided with a rectangular top, end dies are arranged at the left end and the right end of the bottom die respectively, inner dies are arranged between the end dies located at the two ends respectively, side dies are arranged on the front side and the rear side of the bottom die respectively, each side die is in a U shape with an upward opening, and two U-shaped arms of each side die are fixedly connected with the end die at the corresponding end and the inner die through fastening and positioning mechanisms respectively. According to the assembled air duct mold, the air duct does not need to be turned over and is directly hoisted through hoisting bolts, the air duct can be directly and fixedly connected with a middle plate in a subway space through the hoisting bolts, the operation difficulty is greatly lowered, the workload of workers is reduced, and installation is very convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of air duct molds, and particularly relates to an assembled air duct mold. Background Art

[0002] An air duct is a commonly installed component in subway spaces and workshop factories. Its basic structure is as Figure 1 shown. The cross-section of the air duct is generally U-shaped as a whole, including an air duct bottom 21 and air duct side arms 22 located on both sides of the air duct bottom. During installation, the air duct side walls on both sides are connected to the bottom of the middle plate of the subway station, and the air duct and the middle plate form a rectangular passage. When manufacturing the air duct, the method of casting reinforced concrete is often used. Concrete is cast in the air duct mold and installed at the required position after forming. The air duct mold of the prior art, such as the Chinese utility model patent with the publication number CN112720808A, has an overall structure with an opening facing downwards, and the opening of the cast air duct also faces downwards. When the air duct needs to be hoisted under the middle plate for assembly with the middle plate, the middle plate needs to be flipped first, and then the air duct is assembled with the middle plate through bolts, etc., resulting in complex operations and difficult hoisting. Moreover, since there is no hoisting and installation structure on the air duct, the operation during hoisting is not convenient and safe. During installation, drilling operations are required, resulting in low installation efficiency and high intensity. Summary of the Utility Model

[0003] The purpose of the utility model is to provide an assembled air duct mold for the air duct manufactured by the existing technology mold, which needs to be flipped on site during installation, with its bottom flipped from above to below and then drilled for installation, resulting in inconvenient installation and large workload.

[0004] The technical solution for the utility model to solve the technical problem is as follows:

[0005] An assembled air duct mold, the air duct mold includes a bottom mold, side molds, an inner mold and end molds. The bottom mold has a rectangular top. The end molds are respectively arranged at the left and right ends of the bottom mold. The inner mold is respectively arranged between the end molds at both ends. The side molds are respectively arranged on the front and back sides of the bottom mold. The side mold is U-shaped with an opening facing upwards. The two U-shaped arms of each side mold are respectively fixedly connected to the corresponding end mold and inner mold through a fastening and positioning mechanism, and its bottom is fixedly connected to the bottom mold through a fastening and positioning mechanism. The U-shaped arms of the two side molds and the bottom mold and side mold at the corresponding end form a side arm forming cavity for forming the air duct side arm. The bottom mold and the bottoms of the two side molds form a bottom forming cavity for forming the air duct bottom. The side arm forming cavity is located above the bottom forming cavity. The lower parts between the bottom forming cavity and the side arm forming cavities on both sides are respectively interconnected. At least one limiting member is respectively arranged on the tops of the end molds on both sides. A limiting through hole is arranged on the limiting member for accommodating the bolt rod of the hoisting bolt. The limiting member is cantilevered on the top of the end mold, and the projection of the limiting through hole on the side arm forming cavity is located inside the side arm forming cavity;

[0006] The limiting member is a combined clamping plate. The combined clamping plate includes a first clamping plate and a second clamping plate which are U-shaped and are stacked vertically in pairs and arranged in opposite directions. The inner sides of the U-shaped bottoms of the first clamping plate and the second clamping plate are both semi-circular arcs with equal radii. Long circular holes are respectively arranged at the end parts of the two U-shaped arms of the second clamping plate. A connecting through hole is arranged at the bottom of the first clamping plate. When the first clamping plate and the second clamping plate are stacked, the bottom of the semi-circular arc forms a circular limiting through hole. The long circular hole of the first clamping plate and the connecting through hole of the second clamping plate are arranged vertically opposite to each other;

[0007] The connecting bolt passes through the long circular hole of the first clamping plate and the communication hole of the second clamping plate. The first clamping plate and the second clamping plate are fixedly connected to the top of the end die through the connecting bolt;

[0008] Fixing members are respectively arranged in each of the side arm forming cavities for fixing the heads of the hoisting bolts. The positions of the fixing members are vertically corresponding to the positions of the limiting through holes;

[0009] The fixing member is a channel steel, and the channel steel is horizontally arranged in the side arm forming cavity;

[0010] The tight fixing and positioning mechanism for connecting the end die and the side die includes a fastening bolt, a positioning seat and a positioning pin. A bolt hole and a conical bayonet slot with a common center line are arranged on the positioning seat. The positioning seat is fixedly arranged on the side facing the end die of the U-shaped arm of the side die, and the large opening end of its bayonet slot faces the U-shaped arm of the side die. The positioning pin includes a conical pin head and a cylindrical pin shank. The conical pin head has the same taper as the conical bayonet slot. A conical through hole coaxial with the conical pin head is arranged in the positioning pin. The positioning pin is fixedly arranged on the side facing the U-shaped arm of the side die of the end die through the cylindrical pin shank. The positioning seat and the positioning pin are inserted and connected through the conical bayonet slot and the conical pin head, and the end die and the side die are fixedly connected together by the threaded cooperation of the fastening bolt and the bolt hole;

[0011] Both the end die and the inner die include a plate body. Three horizontal reinforcing plates one are fixedly arranged on the outer side of the plate body along the height direction of the plate body. Vertical reinforcing plates one are fixedly arranged between the horizontal reinforcing plates one. The horizontal reinforcing plates one and the vertical reinforcing plates one are fixedly connected. The side die includes a U-shaped plate body. Vertical reinforcing plates two are respectively arranged on both sides of the U-shaped arm of the side die plate body. A transverse reinforcing plate is arranged between the two vertical reinforcing plates two. The transverse reinforcing plate and the vertical reinforcing plate are fixedly connected to the U-shaped arm of the side die plate body. The U-shaped arm of the side die is fixedly connected to the plate bodies of the end die and the inner die through its vertical reinforcing plates two. Two transverse reinforcing plates are fixedly arranged at the bottom of the side die plate body. A vertical reinforcing plate two is fixedly arranged between the two transverse reinforcing plates. The bottom of the side die is fixedly connected to the bottom die through the bottom of its plate body;

[0012] It further includes a lower hanging plate forming cavity which is located below the side wall forming cavity on one side and communicates with the side wall forming cavity. The lower hanging plate forming cavity is composed of the lower end of the end die on one side, the lower inner die and the lower hanging plate bottom plate.

[0013] The advantages and beneficial effects of the present utility model are as follows:

[0014] For the assembled air duct mold adopting the structure of the present utility model, since the top parts of the end dies on both sides of the air duct mold are respectively provided with limiting parts and fixing parts are arranged in the inner cavity of the mold, before pouring concrete, lifting bolts can be embedded in the forming cavity of the air duct mold, so that lifting bolts perpendicular to the bottom of the air duct are arranged in each air duct side arm of the prepared air duct. When hoisting, the lifting bolts are used as the hoisting tools, making the hoisting operation convenient and fast. Moreover, since the air duct mold itself has an upward opening, it is not necessary to turn over the air duct and it can be directly hoisted through the lifting bolts, and the air duct can also be directly fixedly connected to the middle plate in the subway space through the lifting bolts, greatly reducing the operation difficulty, reducing the workload of workers, and being very convenient for installation. Description of the Drawings

[0015] Figure 1 It is a schematic perspective structure diagram of an embodiment of the assembled air duct mold of the present utility model;

[0016] Figure 2 It is a schematic front view of the assembled air duct mold of the present utility model;

[0017] Figure 3 It is Figure 2 a schematic left view of;

[0018] Figure 4 It is a schematic diagram of the assembled air duct mold with the structure of another embodiment of the present utility model;

[0019] Figure 5 It is Figure 2 a schematic top view of;

[0020] Figure 6 It is a schematic diagram of the state after the combined card boards of the present invention are combined together;

[0021] Figure 7 It is Figure 6 a schematic structural diagram of an embodiment of the card board one of the combined card boards;

[0022] Figure 8 It is Figure 7 a schematic structural diagram of an embodiment of the card board two of the combined card boards;

[0023] Figure 9 It is a schematic structural diagram of an embodiment of the air duct;

[0024] Figure 10Schematic structural diagram of another embodiment of the air duct.

[0025] Description of reference numerals

[0026] 1 - Translation mechanism; 2 - Bottom mold; 3 - First end mold; 301 - First horizontal reinforcement plate; 302 - Second horizontal reinforcement plate;

[0027] 4 - First side mold; 401 - First vertical reinforcement plate; 402 - Second vertical reinforcement plate; 5 - Second side mold; 6 - First inner mold; 7 - Second inner mold; 9 - Tightening and positioning mechanism; 901 - Tightening bolt; 902 - Positioning seat; 903 - Positioning pin; 904 - Fixed block; 15 - Combined clamping plate; 151 - Semi - circular arc; 152 - Elongated circular hole; 153 - Connecting through - hole; 154 - Hoisting bolt positioning hole; 155 - First clamping plate; 156 - Second clamping plate.

[0028] 16 - Side - arm forming cavity; 17 - Bottom forming cavity;

[0029] 21 - Air - duct bottom; 22 - Air - duct side arm; 23 - Hanging plate. Detailed implementation manners

[0030] The present utility model will be further described in detail through specific embodiments below. The following embodiments are only descriptive and not restrictive, and the protection scope of the present utility model cannot be limited thereby. For the convenience of description, the following takes Figure 2 the shown position as an example for illustration. This position does not limit the orientation of the present utility model, but only illustrates the positional relationship between various components.

[0031] As Figures 1 to 8As shown in the figure, the air duct mold of the structure of the embodiment of the present utility model includes a bottom mold 2, end molds 3, side molds, and inner molds. The end molds, side molds, and inner molds are all located above the bottom mold and are all vertically arranged with respect to the bottom mold, forming an air duct mold with an upward-opening flat-bottom U-shaped structure. Specifically, the bottom mold 2 is a flat-top rectangular plate. Side molds are respectively arranged on the front and rear sides of the bottom mold, namely side mold one 4 and side mold two 5. The side mold includes a U-shaped plate body, simply referred to as a U-shaped plate body, and the U-shaped plate body is similar to the U-shaped structure of the air duct cross-section. The front and rear sides of the bottom mold are respectively fixedly connected to side mold one and side mold two on the corresponding sides through a tight fixing and positioning mechanism 9. End molds 3 are respectively arranged at the left and right ends of the bottom mold. The end mold is fixedly connected to the outer side of the U-shaped plate body of the corresponding side mold and the bottom mold respectively through a tight fixing and positioning mechanism. The end mold closes the space between the U-shaped walls of the front and rear two side molds. Inner molds are respectively arranged between the two side end molds, namely inner mold one 6 and inner mold two 7. The inner mold is located between the U-shaped arms of the two side molds and is fixedly connected to the inner sides of the U-shaped arms of the two side molds through a tight fixing and positioning mechanism 9. The inner mold straddles the flat-bottom tops of side mold one and side mold two, so that there is a certain distance between the bottom mold and the inner mold to form a communication channel. The inner mold closes the space between the U-shaped walls at the corresponding ends of the front and rear two side molds. The end mold, inner mold, U-shaped arms of the front and rear two side molds, and bottom mold at the corresponding ends form a forming cavity for forming the air duct side arm 22 of the air duct U-shaped structure, called the side wall forming cavity 16. The bottom mold and the front and rear two side molds form a forming cavity for forming the air duct bottom of the air duct U-shaped structure, called the bottom forming cavity 17. The side arm forming cavity and the bottom forming cavity are connected through the communication channel between the inner mold and the bottom mold. An I-shaped steel channel is fixedly arranged in each side arm forming cavity as a fixing piece for fixing the lifting bolts. One end of the bolt rod of the lifting bolt close to the bolt head is fixedly connected to the fixing piece. Limit pieces are respectively arranged on the tops of the two side end molds for limiting the position of the lifting bolts. The limit pieces cooperate with the fixing pieces to prevent the lifting bolts from tilting when pouring the air duct. Limit through holes are arranged on the limit pieces. The limit pieces are cantilevered, and the positions of the limit through holes are vertically corresponding to the positions where the fixing pieces fix the lifting bolts. The bolt rod of the lifting bolt passes through the limit through holes and is positioned through the limit through holes arranged on the limit pieces to ensure that the position of the lifting bolt does not shift during pouring and vibration, and keep the bolt rod of the lifting bolt perpendicular to the bottom mold. As Figures 6 - 8As shown in the figure, a relatively good structure of the limiting member is a combined clamping plate, which includes two U-shaped plates, namely clamping plate one 155 and clamping plate two 156. The inner sides of the U-shaped bottoms of clamping plate one and clamping plate two are both semi-circular arcs, and the radii of the semi-circular arcs of clamping plate one and clamping plate two are equal. Two connecting through holes 153 are arranged at the bottom of clamping plate one, and a long circular hole 152 is arranged on each of the two U-shaped arms of clamping plate two. When the two U-shaped plates are clamped and stacked, the connecting through holes and the long circular holes are arranged vertically opposite to each other, and the inner sides of their semi-circular U-shaped bottoms form a circular hole as the limiting through hole for accommodating the bolt rod. Clamping plate one is fixedly connected to the top of the end die of the mold by welding at its bottom, and its U-shaped opening faces the side arm forming cavity corresponding to the position of the fixing member at the bottom of the forming cavity. The bolt rod of the lifting bolt is sleeved outside through the opening of clamping plate one. The two long circular holes on the two U-shaped arms of clamping plate two are aligned with the connecting through holes on clamping plate one respectively, and then they are fastened to the top of the end die by connecting bolts. The structure of using two U-shaped plates with opposite openings to clamp and limit the lifting bolt is convenient for operation. Especially when opening the mold, only clamping plate two needs to be removed, and clamping plate one remains unchanged. When assembling next time, just push the end die horizontally, and the bolt rod of the lifting bolt can enter the semi-circular arc of clamping plate one, which is very convenient for operation. In a better solution, clamping plate one and clamping plate two are clamped and stacked up and down as a whole and are fixedly arranged on the top of the end die of the mold by bolts at the same time. Clamping plate one and clamping plate two are combined together to form a limiting through hole for the bolt rod to pass through. When disassembling the mold, clamping plate one and clamping plate two are removed at the same time. When installing the mold, the bolt passes through the limiting through hole formed by clamping plate one and clamping plate two and then is installed at the same time, which is more convenient for operation.

[0032] For the assembled air duct mold adopting the structure of the present utility model, when pouring the air duct, the head of the lifting bolt is fixedly connected to the fixing member arranged in the forming cavity of the mold in advance, and the bolt rod of the lifting bolt passes through the limiting through hole arranged on the limiting member and is movably connected with the limiting member. The limiting through hole and the bolt rod of the lifting bolt are in clearance fit connection to ensure that the bolt rod does not deflect. Since the head of the lifting bolt is fixed by the fixing member located in the forming cavity and the bolt rod is limited by the limiting hole, when pouring concrete into the inner cavity of the mold, the impact force of the concrete will not cause the bolt rod of the lifting bolt to deflect, which can protect the position accuracy of the lifting bolt and is convenient for positioning and installing the air duct and the middle plate.

[0033] The lifting bolt can be used as a tool for lifting the air duct and also as a positioning and installation component for installing the air duct.

[0034] In the present utility model, such as Figure 2As shown in the figure, the fastening and positioning mechanism preferably adopts the following structure, including a fastening bolt 901 and a positioning structure. The positioning structure includes a positioning seat 902 and a positioning pin 903. The positioning seat is provided with a bolt hole and a conical bayonet groove that share the same center line. The positioning seat is fixedly arranged on the side of the U-shaped arm of the side mold facing the end mold. The bayonet groove is arranged opposite to the end mold, and the large opening end of the bayonet groove faces the end mold. The positioning pin 903 includes a conical pin head and a cylindrical pin shank. The positioning pin 903 is arranged on the side of the end mold facing the U-shaped arm of the side mold. The positioning pin 903 is fixedly connected to the end mold through the pin shank. The taper of the conical pin head is the same as that of the conical bayonet groove, and the two are connected in an insertion fit. The positioning pin is provided with a conical through hole that shares the same center line with the bolt hole. A fixing block 904 is fixedly arranged on the end mold. The fixing block is provided with a fixing block threaded hole, and the fixing block threaded hole is collinear with the bolt hole. When disassembling the mold, the removed bolt can be placed to prevent the bolt from being lost. When the fastening and positioning mechanism is used to connect the side mold with the bottom mold and the side mold with the inner mold, the positioning pin is fixedly arranged on the bottom mold and the inner mold, and the fixing block is fixedly arranged on the side mold and the inner mold. With the fastening and positioning mechanism adopting the structure of the present invention, when installing the mold, the conical bayonet groove and the positioning pin are centered, so that the two connected components are aligned first, and then the bolt is inserted for fastening connection, making the operation of bolt connection simple, fast and convenient. Since the positioning pin is conical and the bayonet groove is also conical, the two are very easy to insert, reducing the accuracy requirements for the alignment position of the two connected components and ensuring the assembly accuracy of the mold.

[0035] In the mold of the present invention, preferably, the templates of the inner mold, the side mold and the end mold are all provided with reinforcing rib plates and reinforcing plates to reduce the overall weight of the mold, ensure the overall strength of the mold, and facilitate the assembly of the mold. Specifically, the main structures of the end mold and the inner mold are both rectangular plates. On their outer sides, there are three layers of horizontal reinforcing plates one 301, namely, the upper horizontal reinforcing plate one is located at the top, the lower horizontal reinforcing plate one is located at the bottom, and vertical reinforcing plates one 401 are arranged between the three layers of horizontal reinforcing plates one to form an integral body with the rectangular plate body and the three layers of horizontal reinforcing plates, forming a grid structure. The width of the bottom horizontal reinforcing plate one of the end mold and the inner mold is greater than the width of the top horizontal reinforcing plate one, which is convenient for the connection of the fastening and positioning mechanism. On the outer side of the U-shaped plate body of the side mold, there is a transverse reinforcing plate two, and at both ends of the outer side of its side arms, there are vertical reinforcing plates two respectively. The two vertical reinforcing plates two are fixedly connected through the transverse reinforcing plate two. With this structure, the end mold and the inner mold are respectively connected to one of the vertical reinforcing plates two of the side mold, which is convenient for the disassembly and assembly of the fastening and positioning mechanism and also reduces the overall weight of the mold. The bottom mold template is in contact with and hermetically connected to the bottoms of the end mold, the side mold and the inner mold. The inner mold is bolted to the horizontal and vertical planes of the side mold at the same time.

[0036] A lower hanging plate forming cavity can also be arranged below the side arm forming cavity for casting and forming the lower hanging plate of the air duct. A lower inner mold 159 is arranged below one side of the bottom mold 2. The lower end of the first end mold on this side is located below the bottom mold 2. A lower protruding plate is arranged on the side of the side mold corresponding to the first end mold. The bottom of the lower hanging plate forming cavity 157 formed by closing the lower end of the first end mold, the lower inner mold and the lower protruding plate of the side mold through the lower bottom plate 158 is closed. The lower hanging plate forming cavity 157 communicates with the side arm forming cavity 16. The top of the lower inner mold and the lower bottom plate are fixedly connected through a tightening and positioning mechanism.

Claims

1. An assembled air duct mold, characterized in that: The air duct mold comprises a bottom mold, a side mold, an inner mold and an end mold. The bottom mold has a rectangular top. The end molds are respectively arranged at the left and right ends of the bottom mold. The inner molds are respectively arranged between the end molds at the two ends. The side molds are respectively arranged on the front and back sides of the bottom mold. The side molds are U-shaped with the opening upward. The two U-shaped arms of each side mold are respectively fixedly connected to the end mold and the inner mold at the corresponding end through a tightening positioning mechanism. The bottom of the side mold is fixedly connected to the bottom mold through a tightening positioning mechanism. The U-shaped arms of the two side molds are connected to the corresponding ends. The bottom mold and the side molds constitute a side arm forming cavity for forming the side arms of the air duct, the bottom mold and the bottoms of the two side molds constitute a bottom forming cavity for forming the bottom of the air duct, the side arm forming cavity is located above the bottom forming cavity, the bottom forming cavity and the lower parts of the side arm forming cavities on both sides are respectively connected to each other, at least one limit member is respectively arranged on the top of the end molds on both sides, a limit through hole is arranged on the limit member for accommodating the bolt rod of the hanging bolt, the limit member cantilever is arranged at the top of the end mold, and the projection of the limit through hole is located in the side arm forming cavity.

2. The assembled air duct mold according to claim 1, characterized in that: The limiting member is a combined card plate, which includes a U-shaped card plate 1 and a card plate 2 which are stacked up and down in pairs and arranged in opposite directions. The inner sides of the U-shaped bottoms of the card plate 1 and the card plate 2 are semicircular arcs of equal radius, and oblong holes are respectively provided at the ends of the two U-shaped arms of the card plate 2. A connecting through hole is provided at the bottom of the card plate 1. When the card plate 1 and the card plate 2 are stacked, the bottom of the semicircular arc constitutes a circular limiting through hole, and the oblong hole of the card plate 1 and the connecting through hole of the card plate 2 are arranged opposite to each other up and down.

3. The assembled air duct mold according to claim 2, characterized in that: The connecting bolt passes through the oblong hole of the first clamping plate and the communicating hole of the second clamping plate, and the first clamping plate and the second clamping plate are fixedly connected with the top of the end mold through the connecting bolt.

4. The assembled air duct mold according to claim 1, characterized in that: A fixing piece is respectively arranged in each of the side arm forming cavities for fixing the head of the hanging bolt, and the position of the fixing piece corresponds to the position of the limiting through hole in the upper and lower parts.

5. The assembled air duct mold according to claim 4, characterized in that: The fixing piece is a channel steel, which is horizontally arranged in the side arm forming cavity.

6. The assembled air duct mold according to claim 1 or 2, characterized in that: The fastening and positioning mechanism connecting the end mold and the side mold includes a fastening bolt, a locating seat and a locating pin. The locating seat is provided with a bolt hole and a tapered bayonet groove having a co-center line. The locating seat is fixedly arranged on the side of the U-shaped arm of the side mold facing the end mold, and the large opening end of the bayonet groove faces the U-shaped arm of the side mold. The locating pin includes a tapered pin head and a cylindrical pin handle. The tapered pin head has the same taper as the tapered bayonet groove. A tapered through hole having a co-center line with the tapered pin head is arranged in the locating pin. The locating pin is fixedly arranged on the side of the U-shaped arm of the end mold facing the side mold through the cylindrical pin handle. The locating seat and the locating pin are inserted and matched through the tapered bayonet groove and the tapered pin head. The end mold and the side mold are fixedly connected together by the fastening bolt and the bolt hole threaded connection.

7. The assembled air duct mold according to claim 1, characterized in that: The end mold and the inner mold both include a plate body, and three horizontal reinforcement plates (upper, middle and lower) are fixedly arranged on the outer side of the plate body along the height direction of the plate body, and a vertical reinforcement plate (one) is fixedly arranged between the horizontal reinforcement plates, and the horizontal reinforcement plate (one) is fixedly connected to the vertical reinforcement plate (one); the side mold includes a U-shaped plate body, and vertical reinforcement plates (two) are respectively arranged on both sides of the U-shaped arm of the side mold body, and a transverse reinforcement plate is arranged between the two vertical reinforcement plates on both sides, and the transverse reinforcement plates and the vertical reinforcement plates are fixedly connected to the U-shaped arms of the side mold body, and the U-shaped arms of the side mold are fixedly connected to the plate bodies of the end mold and the inner mold through the vertical reinforcement plates (two); two upper and lower transverse reinforcement plates are fixedly arranged on the bottom of the side mold body, and a vertical reinforcement plate (two) is fixedly arranged between the two transverse reinforcement plates, and the bottom of the side mold is fixedly connected to the bottom mold through the bottom of its plate body.

8. The assembled air duct mold according to any one of claims 1 to 4, characterized in that: It also includes a lower hanging plate forming cavity, which is located below the side wall forming cavity on one side and is connected to the side wall forming cavity. The lower hanging plate forming cavity is composed of the lower end of the end mold on one side, the lower inner mold and the lower hanging plate bottom plate.

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