Integrated threaded clamp connector and prefabricated reinforced connection system

Abstract

The present invention relates to an integrated threaded clamp connector and a prefabricated reinforced connection system, wherein the connector comprises a first connection part and a second connection part, wherein: the threaded locking head of the first connection part is exposed from the first tensioning nut and is provided with an external thread A; the second connection part comprises a second tensioning nut and an integrated clamp located between a retaining ring and an intermediate support sleeve, the integrated clamp is composed of an elastic body and a clamp inserted at its end, the inner side surface of the exposed multi-piece tapered thread clamp of the clamp is provided with an internal thread A, and the outer side surface is in contact with the intermediate support sleeve and the contact surface is consistent; the threaded locking head passes through the intermediate support sleeve and engages with the multi-piece tapered thread clamp to achieve a butt connection of the two connection parts. Compared with the prior art, the present invention effectively prevents the existing connector from being missed or falling off when installing the locking piece, and further improves the connection when the end faces of the two components are uneven, so that multiple connectors on the end faces of the two components can be stressed at the same time, and when used in conjunction with the connecting end plate, the connection is more reliable.

Description

Technical Field

[0001] The present invention belongs to the technical field of building components, and relates to a connection assembly for prefabricated parts (components), and in particular to an integrated threaded clamping connector and a prefabricated part reinforced connection system. Background Art

[0002] The connection of prefabricated parts (such as pull-out piles, etc.) is mostly done by welding in the prior art. After the pile bodies of two welded piles are aligned, the metal end plates of the pile heads are welded together. This is not only inconvenient to operate, but the welded metal plates at the connection are exposed and easily corroded, thus affecting the use effect and lifespan.

[0003] In order to solve the above-mentioned drawbacks of the above-mentioned metal end plate welding connection form, Chinese patent CN101519876A and others disclose docking parts of prefabricated parts, through which the quick connection of prefabricated parts is realized. However, in these docking parts, multiple independent cards used to realize the locking of the plug connector are directly placed on the gasket, which is easy to be missed or fall off. In addition, the plug connector is locked with the card through the expansion part, and the plug connector must be plugged in place to achieve a reliable connection. This requires a high degree of flatness of the end face shape of the prefabricated part. If the end face is not flat, the plug connector is not plugged in consistently, and it is likely that it will not be plugged in place and cannot be effectively locked by the card. Some (some) connectors on the end face of the prefabricated part may be unable to bear force, resulting in these (some) connectors being in a state of failure. Summary of the invention

[0004] The purpose of the present invention is to provide an integrated threaded clamp connector and a prefabricated reinforced connection system. It can effectively prevent the existing connector installation locking piece from missing or falling off, and further improve the connection when the end faces of the two components are uneven, so that multiple connectors on the end faces of the two components can be stressed at the same time, easy to install, fast construction and docking, both environmentally friendly and safe. Furthermore, when the connector of the present invention is used in conjunction with the connecting end plate to form a prefabricated reinforced connection system, it has both mechanical connection and welding, achieving double protection, and the connected prefabricated parts are safer and more reliable.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A first aspect of the present invention provides an integrated threaded clamping connector, comprising:

[0007] The first connecting part comprises a first tensioning nut and a threaded locking rod, one end of the threaded locking rod is inserted into and connected to the first tensioning nut, and the other end is a threaded locking head with an external thread A and exposed from the first tensioning nut.

[0008] The second connecting part comprises a second tensioning nut with a retaining ring at one end, an intermediate support sleeve connected to the other end of the second tensioning nut, and an integrated clamp arranged between the retaining ring and the intermediate support sleeve, wherein the integrated clamp is composed of an elastic body and a clamp inserted at the end of the elastic body, the clamp faces the intermediate support sleeve, and has a multi-piece tapered threaded clamp exposed at the end of the elastic body, the inner side surface of the multi-piece tapered threaded clamp is provided with an internal thread A matching the threaded plug lock head, and the outer side surface contacts the intermediate support sleeve, and the contact surfaces of the two coincide with each other;

[0009] The threaded locking head passes through the middle support sleeve and engages with the multi-piece tapered thread card to achieve a butt connection between the first connecting part and the second connecting part.

[0010] Preferably, the multi-piece tapered thread card is surrounded by a plurality of separated tapered pieces, the outer side surface is tapered, and the contact surface between the middle support sleeve and the multi-piece tapered thread card is tapered to match the outer side surface of the multi-piece tapered thread card.

[0011] Preferably, the outer side surface of the multi-piece tapered thread card is provided with an external thread B, and the contact surface between the intermediate support sleeve and the multi-piece tapered thread card is provided with an internal thread B matching the external thread B of the multi-piece tapered thread card.

[0012] Preferably, the card holder further comprises an inserting portion for being inserted into the elastic body, and the end of the elastic body is provided with a slot matching the inserting portion.

[0013] Preferably, the insertion portion is formed by a plurality of arc pieces which are respectively connected to the multi-piece tapered thread cards and are surrounded by a cylindrical shape.

[0014] Preferably, two adjacent arc pieces are connected to each other.

[0015] Preferably, the elastomer is a cylindrical elastic rubber.

[0016] Preferably, the inner diameter of the intermediate support sleeve matches the inner diameter of the multi-piece tapered thread card.

[0017] The main body of the threaded locking head is cylindrical, and the external thread A is arranged on the outer side of the cylindrical main body.

[0018] Preferably, the end of the threaded locking head is gradually contracted and provided with a correction guide head.

[0019] A second aspect of the present invention provides a prefabricated component reinforced connection system, comprising connecting end plates and a plurality of connecting parts respectively arranged on the butt end surfaces of two butt-connected prefabricated components, wherein the connecting end plates are provided with a plurality of nut connecting holes, and a first tensioning nut and a second tensioning nut of the plurality of connecting parts are respectively connected to the nut connecting holes on the connecting end plates of the two prefabricated components through threads; the connecting end plates on the butt end surfaces of the two prefabricated components are welded and connected after the threaded locking head of the connecting part is engaged with the multi-piece conical thread card.

[0020] Preferably, the connecting end plate is in the shape of a square plate or a circular plate.

[0021] The working principle of the present invention is:

[0022] The first connecting part and the second connecting part are respectively arranged on the butt end faces of the two prefabricated parts that need to be butt-jointed. When the two prefabricated parts are butt-jointed, the threaded locking head of the threaded locking rod of the first connecting part is inserted into the second connecting part, and is inserted into the integrated clamp through the intermediate support sleeve. When the threaded locking head is inserted into the integrated clamp, the elastic body is squeezed through the clamp, and the elastic body is squeezed and contracted, which will cause the multi-piece conical threaded clamp of the clamp to break contact with the tapered inclined surface of the intermediate support sleeve and expand at the same time. As the multi-piece conical threaded clamp expands, the elastic force of the elastic body will prompt the clamp to reset, and contact with the intermediate support sleeve through the tapered inclined surface, and at the same time engage the part of the threaded locking head inserted into the clamp; then the threaded locking head continues to be inserted, and the above process is repeated until the two prefabricated parts are butt-jointed.

[0023] Compared with the prior art, the present invention can effectively prevent the existing connector installation locking piece from missing or falling off, and further improves the connection of the uneven end faces of the two components, so that multiple connectors on the end faces of the two components can be stressed at the same time, which is convenient to install, fast to connect, and environmentally friendly and safe. Furthermore, when the connector of the present invention is used in conjunction with the connecting end plate to form a prefabricated component reinforcement connection system, it has both mechanical connection and welding, achieving double protection, and the connected prefabricated components are safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is an exploded schematic diagram of a connector according to an embodiment of the present invention.

[0025] Figure 2 The present invention is a connection diagram of a connector under an embodiment of the present invention, wherein (a) is before the first connection part and the second connection part are connected, (b) is during the connection of the first connection part and the second connection part, and (c) is after the connection of the first connection part and the second connection part is completed.

[0026] Figure 3 The present invention shows a schematic front cross-sectional view (a) and a schematic front view (b) of a connector clamp according to an embodiment of the present invention.

[0027] Figure 4 The present invention is a front cross-sectional schematic diagram (a), a front schematic diagram (b) and a top schematic diagram (c) of an elastic body of a connector in accordance with an embodiment of the present invention.

[0028] Figure 5 The present invention shows a schematic front cross-sectional view (a) and a schematic front view (b) of an integrated clamp of a connector in one embodiment of the present invention.

[0029] Figure 6 The present invention is a front view schematic cross-sectional view (a) and a front view schematic view (b) of an intermediate support sleeve of a connector in one embodiment of the present invention.

[0030] Figure 7 The present invention is a schematic structural diagram of a threaded locking rod of a connector in one embodiment of the present invention.

[0031] Figure 8 The present invention is a connection diagram of a prefabricated component reinforcement connection system in one embodiment of the present invention, wherein (a) is before the first connection part and the second connection part are connected, (b) is during the connection of the first connection part and the second connection part, (c) is when the connection of the first connection part and the second connection part is completed, and (d) is when the connection end plate is completed by welding.

[0032] Fig. 9 for Figure 8 Exploded schematic diagram of the precast reinforced connection system.

[0033] In the figure, 1 is the first connecting part, 11 is the first tensioning nut, 12 is the threaded locking rod, 121 is the threaded locking head, 1211 is the correction guide head, 1212 is the external thread A, 122 is the large end of the locking rod, 2 is the second connecting part, 21 is the second tensioning nut, 211 is the retaining ring, 22 is the intermediate support sleeve, 221 is the internal thread B, 222 is the external thread of the support sleeve, 23 is an integrated clamp, 231 is an elastomer, 2311 is a slot, 232 is a clamp, 2321 is a multi-piece tapered thread card, 23211 is an internal thread A, 23212 is an external thread B, 23213 is a tapered sheet, 2322 is an insertion part, 23221 is an arc sheet, 23222 is a connecting part, 3 is a connecting end plate, 301 is a nut connecting hole, and 31 is a welding point. DETAILED DESCRIPTION

[0034] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Example 1

[0036] An integrated threaded clamp connector, such as Figure 1 , Figure 2 (a) Figure 2 (b) and Figure 2 (c) shows, comprising a first connection part 1 and a second connection part 2, wherein: the first connection part 1 comprises a first tensioning nut 11 and a threaded locking rod 12, one end of the threaded locking rod 12 extends into and is connected to the first tensioning nut 11, and the other end is a threaded locking head 121 with an external thread A1212 and is exposed from the first tensioning nut 11; the second connection part 2 comprises a second tensioning nut 21 with a retaining ring 211 (the retaining ring 211 can be formed by shrinking the end) at one end, an intermediate support sleeve 22 connected to the other end of the second tensioning nut 21, and an integrated type arranged between the retaining ring 211 and the intermediate support sleeve 22. The one-piece clamp 23 is composed of an elastomer 231 and a clamp 232 inserted at the end of the elastomer 231. The clamp 232 faces the middle support sleeve 22 and has a multi-piece tapered thread clamp 2321 exposed at the end of the elastomer 231. The inner side surface of the multi-piece tapered thread clamp 2321 is provided with an internal thread A23211 matching the threaded locking head 121, and the outer side surface contacts the middle support sleeve 22 and the contact surfaces of the two are consistent; the threaded locking head 121 passes through the middle support sleeve 22 and engages with the multi-piece tapered thread clamp 2321 to realize the docking connection between the first connecting part 1 and the second connecting part 2.

[0037] like Figure 2 (a) Figure 2 (b) and Figure 2 As shown in (c), when in use, the first connection part 1 and the second connection part 2 are respectively arranged on the butt end surfaces of the two prefabricated parts that need to be butt-connected (generally, it is necessary to correspondingly arrange multiple first connection parts 1 and second connection parts 2 on the butt end surfaces of the two prefabricated parts). It is generally used for two prefabricated parts that are butt-connected up and down. For example, the first connection part 1 can be arranged on the lower end surface of the prefabricated part located at the top, and the second connection part 2 can be arranged on the upper end surface of the prefabricated part located at the bottom. When two prefabricated parts are butt-connected, first align the first connection parts 1 and the second connection parts 2 of several groups of connecting parts on the upper and lower end surfaces of the two prefabricated parts, and insert the threaded locking head 121 of the threaded locking rod 12 of the first connection part 1 downward into the second connection part 2, and insert it into the integrated clamp 23 through the intermediate support sleeve 22. When the threaded locking head 121 is inserted into the integrated clamp 23, it squeezes the elastic body 231 (downward) through the clamp 232. The elastic body 231 is squeezed and shrinks (downward), which will make the multiple clamps 232 The piece-type conical thread card 2321 (moves downward) disengages from the tapered slope of the middle support sleeve 22 and expands at the same time. As the multi-piece conical thread card 2321 expands, the elastic force of the elastomer 231 (upward) will cause the clamp 232 (moves upward and gathers) to reset, and contact the middle support sleeve 22 through the tapered slope, while engaging the part of the threaded locking head 121 inserted into the clamp 232; then the threaded locking head 121 continues to be inserted, and the above process is repeated until the two prefabricated parts are docked.

[0038] The specially designed clamping card 232 structure is partially inserted into the elastic body 231, so as to limit the clamping card and form an integrated elastic body clamping card structure, which can effectively avoid the situation that the card of the connector is placed directly on the gasket and is easily missed or falls off. In addition, due to the threaded engagement between the threaded locking head 121 and the multi-piece tapered threaded card 2321, even if the threaded locking head is not fully inserted, it can still play a good connection role, improve the connection of the uneven end faces of the two prefabricated parts, and make the multiple connectors on the end faces of the two components bear force at the same time.

[0039] In this embodiment, see Figure 1 , Figure 2 , Figure 3 (a) and Figure 3 (b), it is preferred that the multi-piece tapered thread card 2321 is surrounded by a plurality of separated tapered sheets 23213, for example, there may be two or more tapered sheets. In this embodiment, there are four tapered sheets constituting the multi-piece tapered thread card 2321. The outer side surface of the multi-piece tapered thread card 2321 is conical and hollow, with the end with a smaller diameter facing the intermediate support sleeve 22 and the end with a larger diameter facing the retaining ring 211. The contact surface between the intermediate support sleeve 22 and the multi-piece tapered thread card 2321 is conical and matches the outer side surface of the multi-piece tapered thread card 2321, which plays the role of gathering the multi-piece tapered thread card 2321 when the multi-piece tapered thread card 2321 contacts the intermediate support sleeve 22. Furthermore, an external thread B23212 can be provided on the outer side of the multi-piece tapered thread card 2321, so that the outer side of the multi-piece tapered thread card 2321 is in a tapered inclined thread shape (external thread B23212), and the inner side has a nut with an internal thread 23211, and the contact surface between the intermediate support sleeve 22 and the multi-piece tapered thread card 2321 is provided with an internal thread B221 matching the external thread B23212 of the multi-piece tapered thread card 2321, so that the connection is more stable. Figure 3 (a) Figure 3 (b) Figure 4 (a) Figure 4 (b) Figure 4 (c) Figure 5 (a) Figure 5 (b) Figure 6 (a) and Figure 6As shown in (b), the clamp 232 may also have an insertion portion 2322 for being inserted into the elastic body 231, and a slot 2311 matching the insertion portion 2322 is provided at the end of the elastic body 231. When in use, the insertion portion 2322 is inserted into the slot 2311, and the slot 2311 is annular. Preferably, the insertion portion 2322 is surrounded by a plurality of arc pieces 23221 respectively connected to the multi-piece tapered thread clamp 2321 and surrounding a cylindrical shape. The insertion portion 2322 may be independent, or two adjacent arc pieces 23221 may be connected to each other, so that the multiple tapered clamps 2321 of the multi-piece tapered thread clamp 2321 are separated from each other, and the clamp 232 is a whole as a whole, which is less likely to be missed or fall off. Preferably, two adjacent arc pieces 23221 are interconnected by a connecting portion 23222 located at one end of the arc piece 23221 away from the clamp 232, which not only reduces the influence on the expansion and gathering of the multi-piece tapered thread clamp 2321, but also ensures the integrity of the clamp 232. In practice, the clamp 232 can be obtained by machining processes such as turning on a cylindrical structural metal part. The clamp 232 can be made of an elastic metal material (for example, it can be an alloy material with good elasticity and toughness and high strength. In practice, commercially available elastic metal materials can be selected as needed, for example, manganese steel or 35GrMo can be used as a material for high-strength screws). In this embodiment, the elastomer 231 is preferably a cylindrical elastic rubber. The clamp 232 and the elastomer 231 can be formed by injection molding.

[0040] In this embodiment, Figure 1 , Figure 2 and Figure 7 As shown, one end of the threaded locking rod 12 that extends into and is connected to the first tensioning nut 11 is the locking rod big head 122, and the locking rod big head 122 is connected to the first tensioning nut through a thread. It is further preferred that the main body of the threaded locking head 121 is cylindrical, and the external thread A1212 is provided on the outer side of the cylindrical main body. It is further preferred that the end of the threaded locking head 121 gradually shrinks and is provided with a correction guide head 1211. By providing the correction guide head 1211, the multi-piece tapered thread card 2321 can be corrected when the threaded locking head 121 is inserted, so that the insertion of the threaded locking head 121 is smoother.

[0041] In this embodiment, the intermediate support sleeve 22 is threadedly connected to the internal thread set in the second tensioning nut 21 through the support sleeve external thread 222, and the integrated clamp 23 is limited in the second tensioning nut 21 through the intermediate support sleeve 22 and the retaining ring 211. Preferably, the inner diameter of the intermediate support sleeve 22 matches the inner diameter of the multi-piece tapered thread clamp 2321.

[0042] In short, the present invention can effectively prevent the existing connecting piece installation locking piece from missing or falling off, and further improves the connection of the uneven end faces of the two components, so that multiple connecting pieces on the end faces of the two components can be stressed at the same time, the installation is convenient, the construction and docking are fast, and it is both environmentally friendly and safe.

[0043] Example 2

[0044] A prefabricated reinforced connection system, such as Figure 8 (a) to (d) and Fig. 9 As shown in the figure (only the connecting end plate 3 around one connecting member is shown in the figure), it includes the connecting end plates 3 and multiple connecting members of the embodiment 1, which are respectively arranged on the butt end surfaces of the two butt-connected prefabricated members, and the connecting end plates 3 are provided with multiple nut connecting holes 301, and the first tensioning nut 11 and the second tensioning nut 21 of the multiple connecting members are preferably provided with external threads on the outer sides of the first tensioning nut 11 and the second tensioning nut 21, such as Fig. 9 The first connecting part 1 and the second connecting part 2 are connected to the nut connection holes 301 on the connecting end plates 3 of the two prefabricated parts through threads; the connecting end plates 3 on the butt end surfaces of the two prefabricated parts are welded after the threaded locking head 121 of the connecting part and the multi-piece tapered thread card 2321 are engaged. When the first connecting part 1 and the second connecting part 2 are connected in place, the two connecting end plates 3 are also butted. Figure 8 As shown in (d), the two connecting end plates 3 are connected by welding. The welding can be performed along the periphery of the connecting end plates 3. The welding point 31 is as shown in FIG. Figure 8 (d) shows that the reliability of welding is ensured. The shape of the connecting end plate 3 is a square plate or a circular plate (depending on the shape of the end surface of the prefabricated part).

[0045] In some areas, due to soil problems, it is necessary to strengthen the connection or the particularity of the building connection makes the connection requirements high, and a single connection cannot meet the requirements. In this embodiment, by further providing a connecting end plate 3, both mechanical connection and welding are possible to achieve double protection, and the connected prefabricated parts are safer and more reliable.

[0046] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. An integrated threaded clamp connector, characterized in that: include: The first connecting part (1) comprises a first tensioning nut (11) and a threaded locking rod (12), wherein one end of the threaded locking rod (12) extends into and is connected to the first tensioning nut (11), and the other end is a threaded locking head (121) provided with an external thread A (1212) and exposed outside the first tensioning nut (11). The second connecting part (2) comprises a second tensioning nut (21) having a retaining ring (211) at one end, an intermediate support sleeve (22) connected to the other end of the second tensioning nut (21), and an integrated clamp (23) arranged between the retaining ring (211) and the intermediate support sleeve (22), wherein the integrated clamp (23) comprises an elastic body (231) and a clamp (232) inserted at the end of the elastic body (231), the clamp (232) faces the intermediate support sleeve (22) and has a multi-piece tapered thread clamp (2321) exposed at the end of the elastic body (231), and the inner side surface of the multi-piece tapered thread clamp (2321) is provided with an internal thread A (2321) matching the threaded locking head (121). 211), the outer side surface contacts with the middle support sleeve (22) and the contact surfaces of the two coincide with each other; the multi-piece tapered thread card (2321) is surrounded by a plurality of separated tapered pieces (23213), the outer side surface of the multi-piece tapered thread card (2321) is conical and hollow, the end with a small diameter faces the middle support sleeve (22), and the end with a large diameter faces the retaining ring (211); the contact surface between the middle support sleeve (22) and the multi-piece tapered thread card (2321) is conical and matches the outer side surface of the multi-piece tapered thread card (2321), so as to gather the multi-piece tapered thread card (2321) when the multi-piece tapered thread card (2321) contacts with the middle support sleeve (22); The threaded locking head (121) passes through the intermediate support sleeve (22) and engages with the multi-piece tapered threaded card (2321) to achieve a butt connection between the first connecting part (1) and the second connecting part (2); During docking, the threaded locking head (121) of the threaded locking rod (12) of the first connecting part (1) is inserted downward into the second connecting part (2), and is inserted into the integrated clamp (23) through the intermediate support sleeve (22); when the threaded locking head (121) is inserted into the integrated clamp (23), the elastic body (231) is pressed downward through the clamp (232), and the elastic body (231) is pressed and contracts downward, so that the multi-piece conical threaded clamp (232) of the clamp (232) is compressed. 321) moves downward and breaks away from the tapered slope of the middle support sleeve (22) and expands at the same time. As the multi-piece tapered threaded card (2321) expands, the upward elastic force of the elastic body (231) causes the card (232) to move upward and gather and reset, and contact the middle support sleeve (22) through the tapered slope; at the same time, the threaded locking head (121) is partially inserted into the card (232); then the threaded locking head (121) continues to be inserted, and the above process is repeated until the docking is completed.

2. The one-piece threaded clamp connector according to claim 1, characterized in that: The outer side surface of the multi-piece tapered thread card (2321) is provided with an external thread B (23212), and the contact surface between the middle support sleeve (22) and the multi-piece tapered thread card (2321) is provided with an internal thread B (221) matching the external thread B (23212) of the multi-piece tapered thread card (2321).

3. The one-piece threaded clamp connector according to claim 1, characterized in that: The clamp (232) further comprises an inserting portion (2322) for being inserted into the elastic body (231), and a slot (2311) matching the inserting portion (2322) is provided at the end of the elastic body (231).

4. The one-piece threaded clamp connector according to claim 3, characterized in that: The insertion portion (2322) is formed by a plurality of arc pieces (23221) which are respectively connected to the multi-piece conical thread cards (2321) and are surrounded by a cylindrical shape.

5. The one-piece threaded clamp connector according to claim 4, characterized in that: Two adjacent arc pieces (23221) are connected to each other.

6. The one-piece threaded clamp connector according to claim 1, characterized in that: The elastic body (231) is a cylindrical elastic rubber.

7. The one-piece threaded clamp connector according to claim 1, characterized in that: The main body of the threaded locking head (121) is cylindrical, and the external thread A (1212) is arranged on the outer side of the cylindrical main body.

8. The one-piece threaded clamping connector according to claim 1 or 7, characterized in that: The end of the threaded locking head (121) gradually shrinks and is provided with a correction guide head (1211).

9. A prefabricated component reinforcement connection system, characterized in that: It comprises a connecting end plate (3) respectively arranged on the butt end surfaces of two butt-connected prefabricated parts and a plurality of connecting parts as described in any one of claims 1 to 8, wherein the connecting end plate (3) is provided with a plurality of nut connecting holes (301), and a first tensioning nut (11) and a second tensioning nut (21) of the plurality of connecting parts are respectively connected to the nut connecting holes (301) on the connecting end plates (3) of the two prefabricated parts through threads; the connecting end plates (3) on the butt end surfaces of the two prefabricated parts are welded and connected after the threaded locking head (121) of the connecting part and the multi-piece conical thread card (2321) are engaged with each other.

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