External reinforcing structure of fair-faced concrete formwork

Abstract

The invention provides a bare concrete formwork external reinforcing structure which comprises a supporting mechanism used for fixing bare concrete formworks, the supporting mechanism comprises four fixedly-connected supporting plates, and the supporting plates are fixed to the splicing positions of the bare concrete formworks; the supporting plate and the side wall of the fair-faced concrete formwork are fixed through a fixing mechanism, and a reinforcing mechanism used for increasing the firmness between the supporting plate and the fair-faced concrete formwork is installed on the side wall of the supporting plate; the reinforcing mechanism comprises double steel pipes, at the splicing position of the two double steel pipes, an extrusion plate is slidably connected with a communicating groove in the side wall of one double steel pipe, the side wall of a limiting rod is in threaded connection with a threaded sleeve, and the threaded sleeve abuts against the side wall of the other double steel pipe. The fair-faced concrete formwork external reinforcing structure has the advantages that split screws are not used for fixing, the column formwork is rapidly installed, and it is guaranteed that corners of a fair-faced concrete column are straight and attractive.

Description

Technical Field

[0001] The invention relates to the technical field of fair-faced concrete construction, and in particular to an external reinforcement structure for a fair-faced concrete formwork. Background Art

[0002] Fair-faced concrete refers to concrete that does not require any plastering after the formwork is removed. It only requires simple painting or even no painting. The natural color of the concrete is directly used as the finish. The traces of the formwork joints are regular, the surface is smooth, the color is uniform, and there is no honeycomb, pockmarks, exposed reinforcement, flat slag, powdering, rust spots, or obvious bubbles.

[0003] In the process of overlapping the formwork of the exposed concrete column, tension bolts are often used for formwork support. However, after the exposed concrete column is formed, there are tension bolt holes, and the tension bolt holes cause problems such as leakage and sand, which affect the appearance quality of the exposed concrete. In addition, due to the unevenness of the formwork itself or errors in the installation process, gaps are prone to appear at the joints of the corners of the column formwork, and leakage and expansion of the formwork occur during the pouring process, resulting in uneven surfaces at the corners of the exposed concrete column, affecting the appearance.

[0004] Therefore, it is necessary to provide a new external reinforcement structure of the fair-faced concrete formwork to solve the above problems. Summary of the invention

[0005] The technical problem solved by the invention is to provide an external reinforcement structure for a fair-faced concrete formwork which does not use tension screws for fixing, can quickly install a column formwork, and can ensure that the edges and corners of a fair-faced concrete column are straight and beautiful.

[0006] In order to solve the above technical problems, the external reinforcement structure of the clear water concrete formwork provided by the present invention comprises: a support mechanism for fixing the clear water concrete formwork, the support mechanism comprises four fixedly connected support plates, the support plates are fixed to the joints of the clear water concrete formwork, and the upper and lower support plates are fixed by the splicing mechanism; the support plates are fixed to the side walls of the clear water concrete formwork by a fixing mechanism, and the side walls of the support plates are installed with a reinforcement mechanism for increasing the firmness between the support plates and the clear water concrete formwork; the reinforcement mechanism comprises a double steel pipe, The side wall of the support plate is provided with a sliding groove for the double steel pipe to pass through the support plate, and a plurality of mutually perpendicular double steel pipes are distributed on the side wall of the fair-faced concrete formwork, and connecting grooves are provided at both ends of the double steel pipes; at the joint of two double steel pipes, a limiting rod passes through the connecting grooves of the side walls of the two double steel pipes, and the side wall of the limiting rod is fixedly connected to a trapezoidal extrusion plate, and the extrusion plate is slidably connected to the connecting groove of one of the side walls of the double steel pipes, and the side wall of the limiting rod is threadedly connected to a screw sleeve, and the screw sleeve contacts the side wall of the other double steel pipe.

[0007] Preferably, the side walls of the plain concrete formwork are symmetrically fixedly connected to the back ribs of the formwork, the double steel pipes abut against the back ribs of the formwork, and the side walls of the back ribs of the formwork are provided with connecting grooves.

[0008] Preferably, the fixing mechanism includes a fixing plate, the side wall of the supporting plate is symmetrically rotationally connected to the fixing plate, the side wall of the fixing plate is rotationally connected to the rotating plate, the side wall is "L"-shaped and one end of the fixing plate abuts against the rotating plate; the side wall of the supporting plate is fixedly connected to a limit block that tilts the rotating plate; the surface of the rotating plate is threadedly connected to a plurality of screws, one end of the screw is rotationally connected to a block with an "L"-shaped side wall, and the block with a trapezoidal cross-section at one end abuts against the side wall of the back rib of the template.

[0009] Preferably, a storage groove for accommodating the rotating plate is provided on the surface of the fixed plate, the fixed plate and the rotating plate are slidably connected to the connecting groove, and the height of the fixed plate is smaller than the height of the connecting groove.

[0010] Preferably, the splicing mechanism includes a splicing buckle and a splicing plate, the two ends of the support plate are respectively fixedly connected to the splicing buckle and the splicing plate, and the splicing plate is slidably connected to the splicing buckle; the side walls of the splicing plate and the side walls of the support plate are inclined to be provided with a card slot, the inside of the card slot is slidably connected to a limiting plate whose side wall is trapezoidal, the limiting plate is slidably connected to the bottom end of the splicing buckle, and the bottom end of the limiting plate is provided with a groove for increasing the friction between the limiting plate and the card slot.

[0011] Preferably, in the same supporting mechanism, the side walls of two of the supporting plates are rotatably connected to the fixed plate, and these two supporting plates are in contact with the side walls of the fair-faced concrete formwork; the side walls of the other two supporting plates are provided with the sliding groove, the card slot, the splicing buckle and the splicing plate.

[0012] Preferably, the cross-sections of the four support plates are in a cross-shaped structure, and the joints of the support plates are staggered with the joints of the plain concrete formwork.

[0013] Preferably, the height of the double steel pipe is greater than the height of the extrusion plate, the width of the extrusion plate and the limiting rod is smaller than the width of the connecting groove, and the diameter of the screw sleeve is greater than the width of the connecting groove.

[0014] Compared with the related art, the external reinforcement structure of the fair-faced concrete formwork provided by the present invention has the following beneficial effects: The present invention provides an external reinforcement structure for a clear-water concrete formwork. During the installation of the clear-water concrete formwork, the fixing mechanism is used to fix the upper and lower support plates together, the support plates are fitted to the joints of the clear-water concrete formwork, and the fixing mechanism is used to connect the support plates and the side walls of the clear-water concrete formwork together to complete the preliminary splicing. When the limiting plate is inserted into the card slot to increase the stability of the connection of the support plate, the limiting plate pulls the support plate and the fixing mechanism obliquely downward, so that the fixing mechanism drives the clear-water concrete formwork to move downward, thereby increasing the extrusion force between the upper and lower clear-water concrete formworks, thereby The firmness and sealing shape between the plain concrete formwork are increased; the double steel pipe is used to pass through the slide groove, and at one end of the joint of the double steel pipes, the connecting grooves of the two side walls of the double steel pipes are aligned, and the limit rod is inserted downward into the interior of the connecting groove, and the limit rod drives the extrusion plate to enter the interior of the double steel pipe located above, and the screw sleeve is rotated at the bottom end of the limit rod so that the screw sleeve contacts the side wall of the double steel pipe located below; at the other end of the joint of the double steel pipes, the limit rod is inserted upward into the interior of the connecting groove, and the limit rod drives the extrusion plate to enter the interior of the double steel pipe located below, and the limit rod is inserted into the interior of the double steel pipe located below. The top end of the rod rotates the screw sleeve so that the screw sleeve contacts the side wall of the double steel pipe located above; the screw sleeve turns to the screw sleeve, and the screw sleeve is threadedly connected to the limiting rod. The movement of the screw sleeve drives the limiting rod and the extrusion plate to enter the interior of the double steel pipe. The side wall of the extrusion plate is trapezoidal, and the extrusion plate drives the double steel pipe to move in the direction away from the clear-water concrete formwork. Both ends of the double steel pipe joint are pulled outward, and the double steel pipe movement squeezes the support plate, so that the support plate moves toward the center line of the clear-water concrete column. The support plate pushes the clear-water concrete formwork to gradually close, avoiding gaps at the corners of the clear-water concrete formwork. The support plate is located at the corner of the fair-faced concrete formwork to reinforce the formwork at this location. The support plate increases the stability, firmness and sealing of the joint of the fair-faced concrete formwork, making the corner of the fair-faced concrete column straight and square. When the double steel pipe squeezes the support plate to move toward the center line of the fair-faced concrete column, the support plate drives the splicing plate to pull the limit plate obliquely inward, increasing the firmness of the splicing mechanism, thereby increasing the stability and firmness of the connection of the support plate. At the same time, the fair-faced concrete formwork is installed by the fixing mechanism and the reinforcing mechanism. The steps of installing the formwork are simple and convenient, which is convenient for workers to operate and speeds up installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A structural schematic diagram of a preferred embodiment of the external reinforcement structure of the plain concrete formwork provided by the present invention; Figure 2 for Figure 1 A top view of the exposed concrete formwork structure shown; Figure 3 for Figure 1 An enlarged schematic diagram of the structure at A shown; Figure 4 for Figure 1 An enlarged schematic diagram of the structure at B shown; Figure 5 for Figure 1 An enlarged schematic diagram of the structure at position C is shown; Figure 6 for Figure 2 An enlarged schematic diagram of the structure at D shown; Figure 7 for Figure 2 An enlarged schematic diagram of the structure at position E is shown; Figure 8 for Figure 5 The schematic diagram of the reinforcement mechanism structure decomposition shown; Fig. 9 for Figure 6 The schematic diagram of the reinforcement mechanism structure decomposition shown; Fig.10 for Figure 3 Schematic diagram of the internal structure of the fixed plate shown.

[0016] Numbers in the figure: 1. plain concrete column, 2. plain concrete formwork, 21. formwork back rib, 22. connecting groove, 3. supporting mechanism, 31. supporting plate, 32. slide groove, 4. reinforcement mechanism, 41. double steel pipe, 42. limiting rod, 43. connecting groove, 44. extrusion plate, 45. screw sleeve, 5. fixing mechanism, 51. fixing plate, 52. limiting block, 53. storage groove, 54. rotating plate, 55. screw, 56. clamping block, 6. splicing mechanism, 61. clamping groove, 62. splicing buckle, 63. splicing plate, 64. limiting plate, 65. groove. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0018] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 , Figure 1 A structural schematic diagram of a preferred embodiment of the external reinforcement structure of the plain concrete formwork provided by the present invention; Figure 2 for Figure 1 A top view of the exposed concrete formwork structure shown; Figure 3 for Figure 1 An enlarged schematic diagram of the structure at A shown; Figure 4 for Figure 1 An enlarged schematic diagram of the structure at B shown; Figure 5 for Figure 1 An enlarged schematic diagram of the structure at position C is shown; Figure 6 for Figure 2 An enlarged schematic diagram of the structure at D shown; Figure 7 for Figure 2 An enlarged schematic diagram of the structure at position E is shown; Figure 8 for Figure 5 The schematic diagram of the reinforcement mechanism structure decomposition shown; Fig. 9 for Figure 6 The schematic diagram of the reinforcement mechanism structure decomposition shown; Fig.10 for Figure 3 The internal structure diagram of the fixed plate is shown. The external reinforcement structure of the plain concrete formwork includes: a support mechanism 3 for fixing the plain concrete formwork 2, the support mechanism 3 includes four fixedly connected support plates 31, the support plates 31 are fixed to the joints of the plain concrete formwork 2, in order to facilitate the support plates 31 to provide support to the plain concrete formwork 2, so that the plain concrete formworks 2 can be spliced.

[0019] The side wall of the plain concrete formwork 2 is symmetrically fixedly connected to the formwork back rib 21, the double steel pipe 41 abuts against the formwork back rib 21, and the side wall of the formwork back rib 21 is provided with a connecting groove 22. The support plate 31 is fixed to the side wall of the plain concrete formwork 2 by a fixing mechanism 5, the fixing mechanism 5 comprises a fixing plate 51, the side wall of the support plate 31 is symmetrically rotationally connected to the fixing plate 51, the side wall of the fixing plate 51 is rotationally connected to a rotating plate 54, and the side wall is in an "L" shape, one end of the fixing plate 51 abuts against the rotating plate 54; the side wall of the support plate 31 is fixedly connected to a limit block 52 that tilts the rotating plate 54; the surface of the rotating plate 54 is threadedly connected to a plurality of screws 55, one end of the screws 55 is rotationally connected to a clamping block 5 in an "L" shape on the side wall. 6. The block 56 with a trapezoidal cross-section at one end abuts against the side wall of the template back rib 21; when the plain concrete template 2 fits against the side wall of the support plate 31, the fixing plate 51 is rotated downward, and the fixing plate 51 rotates on the side wall of the plain concrete template 2. The fixing plate 51 passes through the connecting groove 22 on the side of the template back rib 21 and abuts against the limiting block 52, so that the fixing plate 51 is tilted and located on the side wall of the plain concrete template 2. When the support plate 31 moves downward, the plain concrete template 2 is pulled downward through the fixing plate 51.

[0020] The rotating plate 54 is rotated to make it contact with the side wall of the fixed plate 51. When the side wall of the rotating plate 54 is rotated to the screw 55, the screw 55 pushes the "L"-shaped block 56 with a side wall to contact the template back rib 21. The cross-section of one end of the block 56 is a trapezoidal structure. As the block 56 slides on the side wall of the template back rib 21, the block 56 presses the template back rib 21 toward the direction of the plain concrete template 2, thereby increasing the stability of the connection between the template back rib 21 and the block 56. The fixed plate 51 and the block 56 clamp the template back rib 21 up and down, so that the support plate 31 is connected to the plain concrete template 2 through the fixing mechanism 4.

[0021] A storage groove 53 for accommodating the rotating plate 54 is provided on the surface of the fixed plate 51. The fixed plate 51 and the rotating plate 54 are slidably connected to the connecting groove 22, and the height of the fixed plate 51 is less than the height of the connecting groove 22. In order to facilitate the placement of the rotating plate 54 inside the storage groove 53 when not in use, the rotating plate 54 is prevented from sliding out from the side wall of the fixed plate 51, thereby facilitating the rotation of the fixed plate 51 inside the connecting groove 2.

[0022] The support plate 31 between the upper and lower parts is fixed by a splicing mechanism 6, and the splicing mechanism 6 includes a splicing buckle 62 and a splicing plate 63. The two ends of the support plate 31 are respectively fixedly connected to the splicing buckle 62 and the splicing plate 63, and the splicing plate 63 is slidably connected to the splicing buckle 62; the side walls of the splicing plate 63 and the side walls of the support plate 31 are inclinedly provided with a card slot 61, and the inside of the card slot 61 is slidably connected to a limit plate 64 with a trapezoidal side wall, and the limit plate 64 is slidably connected to the bottom end of the splicing buckle 62, and the bottom end of the limit plate 64 is provided with a groove 65 that increases the friction between the limit plate 64 and the card slot 61; when the support plates 31 are connected, the support plate 31 is moved so that the support plate 31 drives the splicing plate 63 to enter the The inside of the splicing buckle 62, and the slot 61 of the side wall of the splicing plate 63 is aligned with the slot 61 of the side wall of the support plate 31, and the limiting plate 64 is hammered into the inside of the slot 61 of the splicing plate 63 and the side wall of the support plate 31. The side wall of the limiting plate 64 is trapezoidal. As the limiting plate 64 enters, the limiting plate 64 pulls the splicing plate 63 and the support plate 31 downward, increasing the stability and firmness of the connection between the support plate 31; and when the limiting plate 64 pulls the support plate 31 and the fixing mechanism 5 obliquely downward, the fixing mechanism 5 drives the plain concrete formwork 2 to move downward, increasing the extrusion force between the upper and lower plain concrete formworks 2, thereby increasing the firmness and sealing shape between the plain concrete formworks 2.

[0023] The side wall of the support plate 31 is installed with a reinforcement mechanism 4 for increasing the firmness between the support plate 31 and the plain concrete formwork 2; the reinforcement mechanism 4 includes a double steel pipe 41, the side wall of the support plate 31 is provided with a slide groove 32 for the double steel pipe 41 to penetrate the support plate 31, and the side wall of the plain concrete formwork 2 is distributed with a plurality of mutually perpendicular double steel pipes 41, and both ends of the double steel pipe 41 are provided with a connecting groove 43; at the joint of two double steel pipes 41, a limiting rod 42 penetrates the connecting groove 43 of the side walls of the two double steel pipes 41, and the side wall of the limiting rod 42 is fixedly connected to a trapezoidal extrusion plate 44, and the extrusion plate 44 is slidably connected to the connecting groove 43 of the side wall of one of the double steel pipes 41, and the side wall of the limiting rod 42 is threadedly connected to a screw sleeve 45, and the screw sleeve 45 abuts against the side wall of the other double steel pipe 41. The double steel pipe 41 is used to penetrate the slide groove 32. At one end of the joint of the double steel pipe 41, the connecting grooves 43 of the side walls of the two double steel pipes 41 are aligned. The limiting rod 42 is inserted downward into the inside of the connecting groove 43. The limiting rod 42 drives the extrusion plate 44 to enter the inside of the double steel pipe 41 located above. The screw sleeve 45 is rotated at the bottom end of the limiting rod 42 so that the screw sleeve 45 contacts the side wall of the double steel pipe 41 located below (as shown in the attached figure). Figure 6 and attached Figure 8 At the other end of the joint of the double steel pipe 41, the limiting rod 42 is inserted upward into the inside of the connecting groove 43, and the limiting rod 42 drives the extrusion plate 44 to enter the inside of the double steel pipe 41 located below, and the screw sleeve 45 is rotated at the top of the limiting rod 42 to make the screw sleeve 45 contact the side wall of the double steel pipe 41 located above (as shown in the attached figure). Figure 7 and attached Fig. 9 As shown); turn to the screw sleeve 45, the screw sleeve 45 is threadedly connected with the limit rod 42, and the movement of the screw sleeve 45 drives the limit rod 42 and the extrusion plate 44 to enter the interior of the double steel pipe 41. The side wall of the extrusion plate 44 is trapezoidal, and the extrusion plate 44 drives the double steel pipe 41 to move in a direction away from the clear-water concrete formwork 2. Both ends of the double steel pipe 41 splicing are pulled outward, and the double steel pipe 41 moves to squeeze the support plate 31, so that the support plate 31 moves toward the center line of the clear-water concrete column 1, and the support plate 31 pushes the clear-water concrete formwork 2 to gradually close, avoiding gaps at the corners of the clear-water concrete formwork 2, and the support plate 31 is located at the corner of the clear-water concrete formwork 2, and the formwork at this place is reinforced. The support plate 31 increases the stability, firmness and sealing of the splicing of the clear-water concrete formwork 2, so that the corners of the clear-water concrete column 1 are straight and square.

[0024] In the same support mechanism 3, the side walls of two of the support plates 31 are rotatably connected to the fixed plate 51, and the two support plates 31 are in contact with the side walls of the plain concrete formwork 2, so that the two support plates 31 can reinforce the joints of the plain concrete formwork 2; the side walls of the other two support plates 31 are provided with the slide groove 32, the card groove 61, the splicing buckle 62 and the splicing plate 63, so that the splicing between the support mechanisms 3 can be completed through the two support plates 31, and the reinforcement mechanism 4 can be installed on the side walls of the two support plates 31.

[0025] The cross-section of the four support plates 31 is a cross-shaped structure, and the joints of the support plates 31 are staggered with the joints of the plain concrete formwork 2 to increase the sealing and firmness of the plain concrete formwork 2 and avoid leakage at the joint corners of the plain concrete formwork 2.

[0026] The height of the double steel pipe 41 is greater than the height of the extrusion plate 44, and the width of the extrusion plate 44 and the limiting rod 42 is less than the width of the connecting groove 43. In order to facilitate the limiting rod 42 and the extrusion plate 44 to enter the double steel pipe 41 and the connecting groove 43, the extrusion plate 44 pulls the double steel pipe 41 outward; and the diameter of the screw sleeve 45 is greater than the width of the connecting groove 43. In order to prevent the screw sleeve 45 from entering the double steel pipe 41, the screw sleeve 45 is rotated downward to pull the limiting rod 42.

[0027] The working principle of the external reinforcement structure of the fair-faced concrete formwork provided by the present invention is as follows: after the upper and lower fair-faced concrete formworks 2 are docked, the support plate 31 is moved so that the support plate 31 drives the splicing plate 63 to enter the interior of the splicing buckle 62, and the support plate 31 contacts the side wall of the fair-faced concrete formwork 2 to provide preliminary support for the fair-faced concrete formwork 2. The fixing plate 51 is rotated downward, and the fixing plate 51 rotates on the side wall of the clear-water concrete formwork 2. The connecting groove 22 of the fixing plate 51 penetrating the side of the template back rib 21 contacts the limiting block 52, so that the fixing plate 51 is tilted and located on the side wall of the clear-water concrete formwork 2. The rotating plate 54 is rotated out from the inside of the storage groove 53, and the side wall of the rotating plate 54 is rotated to the screw 55. The screw 55 pushes the "L"-shaped block 56 on the side wall to contact the template back rib 21. The cross-section of one end of the block 56 is a trapezoidal structure. As the block 56 slides on the side wall of the template back rib 21, the block 56 presses the template back rib 21 toward the clear-water concrete formwork 2, thereby increasing the stability of the connection between the template back rib 21 and the block 56. The fixing plate 51 and the block 56 clamp the template back rib 21 up and down, so that the support plate 31 is connected to the clear-water concrete formwork 2 through the fixing mechanism 4. The limiting plate 64 is hammered into the interior of the slot 61 of the side wall of the splicing plate 63 and the support plate 31. The side wall of the limiting plate 64 is trapezoidal. As the limiting plate 64 enters, the limiting plate 64 pulls the splicing plate 63 and the support plate 31 downward, thereby increasing the stability and firmness of the connection between the support plate 31; and when the limiting plate 64 pulls the support plate 31 and the fixing mechanism 5 obliquely downward, the fixing mechanism 5 is inclinedly arranged on the side wall of the clear water concrete formwork 2, so that the fixing mechanism 5 can pull the clear water concrete formwork 2 downward, thereby increasing the extrusion force between the upper and lower clear water concrete formworks 2, thereby increasing the firmness and sealing shape between the clear water concrete formworks 2.The double steel pipe 41 is used to penetrate the slide groove 32. At the joint of the double steel pipe 41, the limit rod 42 and the extrusion plate 44 are inserted upward or downward into the connecting groove 43; turn to the screw sleeve 45, the screw sleeve 45 is threadedly connected with the limit rod 42, and the movement of the screw sleeve 45 drives the limit rod 42 and the extrusion plate 44 to enter the double steel pipe 41. The side wall of the extrusion plate 44 is trapezoidal, and the extrusion plate 44 drives the double steel pipe 41 to move in the direction away from the plain concrete formwork 2. The double steel pipe 41 Both ends of the joint are pulled outward, and the double steel pipe 41 moves to squeeze the support plate 31, so that the support plate 31 moves toward the center line of the fair-faced concrete column 1, and the support plate 31 pushes the fair-faced concrete formwork 2 to gradually close, avoiding gaps at the corners of the fair-faced concrete formwork 2, and the support plate 31 is located at the corners of the fair-faced concrete formwork 2 to reinforce the formwork at this location. The support plate 31 increases the stability, firmness and sealing of the joint of the fair-faced concrete formwork 2, so that the corners of the fair-faced concrete column 1 are straight and square. When the double steel pipe 41 squeezes the support plate 31 to move toward the center line of the plain concrete column 1, the support plate 31 drives the splicing plate 63 to pull the limit plate 64 obliquely inward, and a plurality of grooves 65 are provided at the bottom end of the limit plate 64. The grooves 65 increase the friction between the limit plate 64 and the slot 61, making it easier for the support plate 31 to pull the splicing plate 63 and the limit plate 64 inward, thereby further increasing the firmness of the splicing mechanism 6, thereby increasing the stability and firmness of the connection of the support plate 31. After the installation of the plain concrete formwork 2 is completed, concrete is poured into the plain concrete formwork 2 to form the plain concrete column 1.

[0028] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fair-faced concrete formwork external reinforcement structure, characterized in that: include: A support mechanism (3) for fixing a plain concrete formwork (2), the support mechanism (3) comprising four fixedly connected support plates (31), the support plates (31) being fixed at joints of the plain concrete formwork (2), and the upper and lower support plates (31) being fixed via a joint mechanism (6); The support plate (31) and the side wall of the plain concrete formwork (2) are fixed via a fixing mechanism (5); a reinforcing mechanism (4) for increasing the firmness between the support plate (31) and the plain concrete formwork (2) is installed on the side wall of the support plate (31); the reinforcing mechanism (4) comprises a double steel pipe (41); the side wall of the support plate (31) is provided with a slide groove (32) for the double steel pipe (41) to penetrate the support plate (31); a plurality of mutually perpendicular double steel pipes (41) are distributed on the side wall of the plain concrete formwork (2); Both ends of the double steel pipe (41) are provided with a connecting groove (43); at the joint of the two double steel pipes (41), a limiting rod (42) penetrates the connecting groove (43) of the side walls of the two double steel pipes (41); the side wall of the limiting rod (42) is fixedly connected to a trapezoidal extrusion plate (44); the extrusion plate (44) is slidably connected to the connecting groove (43) of the side wall of one of the double steel pipes (41); the side wall of the limiting rod (42) is threadedly connected to a screw sleeve (45), and the screw sleeve (45) contacts the side wall of the other double steel pipe (41).

2. The external reinforcement structure of the plain concrete formwork according to claim 1 is characterized in that: The side walls of the plain concrete formwork (2) are symmetrically fixedly connected to the formwork back ribs (21), the double steel pipes (41) abut against the formwork back ribs (21), and the side walls of the formwork back ribs (21) are provided with connection grooves (22).

3. The external reinforcement structure of the plain concrete formwork according to claim 2 is characterized in that: The fixing mechanism (5) comprises a fixing plate (51), the side wall of the support plate (31) is symmetrically rotatably connected to the fixing plate (51), the side wall of the fixing plate (51) is rotatably connected to a rotating plate (54), the side wall of the fixing plate (51) is in an "L" shape, and one end of the fixing plate (51) abuts against the rotating plate (54); the side wall of the support plate (31) is fixedly connected to a limit block (52) that causes the rotating plate (54) to be tilted; the surface of the rotating plate (54) is threadedly connected to a plurality of screw rods (55), one end of the screw rods (55) is rotatably connected to a clamping block (56) with an "L"-shaped side wall, and one end of the clamping block (56) with a trapezoidal cross-section abuts against the side wall of the template back rib (21).

4. The external reinforcement structure of the plain concrete formwork according to claim 3 is characterized in that: A storage groove (53) for accommodating the rotating plate (54) is provided on the surface of the fixed plate (51), the fixed plate (51) and the rotating plate (54) are slidably connected to the connecting groove (22), and the height of the fixed plate (51) is smaller than the height of the connecting groove (22).

5. The external reinforcement structure of the fair-faced concrete formwork according to claim 3 is characterized in that: The splicing mechanism (6) comprises a splicing buckle (62) and a splicing plate (63); the two ends of the support plate (31) are respectively fixedly connected to the splicing buckle (62) and the splicing plate (63); the splicing plate (63) and the splicing buckle (62) are slidably connected; the side wall of the splicing plate (63) and the side wall of the support plate (31) are both inclinedly provided with a clamping groove (61); the inside of the clamping groove (61) is slidably connected to a limiting plate (64) whose side wall is trapezoidal; the limiting plate (64) is slidably connected to the bottom end of the splicing buckle (62); and the bottom end of the limiting plate (64) is provided with a groove (65) for increasing the friction between the limiting plate (64) and the clamping groove (61).

6. The external reinforcement structure of the fair-faced concrete formwork according to claim 5, characterized in that: In the same support mechanism (3), the side walls of two of the support plates (31) are rotatably connected to the fixing plate (51), and the two support plates (31) abut against the side walls of the plain concrete formwork (2); the side walls of the other two support plates (31) are provided with the sliding groove (32), the clamping groove (61), the splicing buckle (62) and the splicing plate (63).

7. The external reinforcement structure of the fair-faced concrete formwork according to claim 6 is characterized in that: The cross-sections of the four support plates (31) are in a cross-shaped structure, and the joints of the support plates (31) are staggered with the joints of the plain concrete formwork (2).

8. The external reinforcement structure of the plain concrete formwork according to claim 1 is characterized in that: The height of the double steel pipe (41) is greater than the height of the extrusion plate (44), the width of the extrusion plate (44) and the limiting rod (42) is less than the width of the connecting groove (43), and the diameter of the screw sleeve (45) is greater than the width of the connecting groove (43).

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