A connecting piece, a modular plastic steel formwork, and application of the formwork on a flood drainage channel

Abstract

The application belongs to the technical field of supporting structures for building construction, and particularly relates to a connecting piece, a modular plastic steel formwork, and application of the formwork on a flood drainage channel. The structure of the connecting piece comprises a connecting frame body unit for being installed between two adjacent formwork main bodies and used for being inserted into the formwork main bodies on both sides, two groups of connecting screws respectively arranged on two side surfaces of the connecting frame body unit and used for penetrating through side edge openings of the main bodies, fastening nuts arranged on the connecting screws and used for abutting against inner side surfaces of the formwork main bodies, and a limiting frame body unit which is clamped on the connecting frame body unit and used for blocking and preventing the fastening nuts from falling during storage and transportation of the connecting piece, wherein the limiting frame body unit is used for supporting the formwork main bodies at least when the connecting piece is used.

Description

Technical Field

[0001] This application belongs to the technical field of support structure for building construction, and particularly relates to a connector, a modular plastic steel formwork, and the application of the formwork in a flood drainage channel. Background Technology

[0002] Drainage channels are artificial drainage ditches built to intercept and divert mountain torrents, slope runoff, and regional rainstorms, thereby protecting towns, farmland, roads, and related facilities from flood disasters. They are a key component of flood control and drainage engineering systems.

[0003] Generally, the construction sequence for a drainage channel is as follows: first, pour the walls on both sides, and then pour the base slab in the middle. Accordingly, the aforementioned formwork is required when pouring the walls.

[0004] Commonly used formwork for building construction can be mainly divided into three categories according to the material: traditional wooden formwork, steel / aluminum formwork, and the aforementioned PVC-U formwork. PVC-U formwork is primarily composed of PP / PE and fiberglass, and its advantages include relatively low cost, 100% recyclability, and ease of cleaning.

[0005] On the other hand, the above three types of templates are generally modular panels, that is, the entire support structure includes multiple repeated template bodies and multiple repeated connection structures, which ultimately allows the template body to be "integrated into a whole". Multiple relatively small templates can be used to cast a relatively large drainage channel wall.

[0006] For example, the utility model patent with authorization announcement number CN 223661356 U and authorization announcement date of 2025.12.12 discloses a new type of quick-assembly plastic steel formwork for construction. Its structure mainly includes: plastic steel formwork body, buckle, slot, slide, first limiting slot, second limiting slot, through hole, locking component, locking pin, locking block, and locking handle.

[0007] The advantages and functions of the plastic steel template in this utility model patent are mainly: it adopts a unique snap-fit ​​connection method, thereby achieving the purpose of rapid assembly.

[0008] However, in actual use, this plastic steel formwork still has at least the following shortcomings in practicality, specifically manifested as follows:

[0009] First, taking its buckle and slot structure as an example, when connecting these two, they need to be vertically misaligned first, and then one of the plastic steel template bodies can be lowered to achieve an effective connection. During this process, one of the plastic steel template bodies needs to be slightly higher than the other plastic steel template body. The former needs to be temporarily lifted or hoisted, and the height difference must fall within a certain range. Therefore, the connection operation is relatively troublesome, which greatly reduces the practicality of the plastic steel template.

[0010] Secondly, its protruding connecting structures, such as buckles and locking components, are relatively easy to be bumped and damaged during storage and transportation of the plastic steel formwork, which can lead to deformation, breakage and other harmful phenomena, ultimately rendering the plastic steel formwork unusable and affecting its overall practicality. Summary of the Invention

[0011] This application provides a connector, the technical problem to be solved by which the modular plastic steel formwork has at least the following two functions and advantages: First, before use, the connection structure is not easily damaged, reducing the safety requirements for the storage and transportation of the formwork; Second, during use, the connection structure can establish a connection relationship relatively conveniently and quickly.

[0012] In addition, this application also provides a modular plastic steel formwork with the above-mentioned connectors, and a method for applying the modular plastic steel formwork in a flood drainage channel.

[0013] The technical solution adopted by this application to solve the above problems is: a connector, the structure of which includes a connecting frame unit for installation between two adjacent template bodies, and both sides for inserting into the template body; two sets of connecting screws respectively disposed on two sides of the connecting frame unit and for passing through openings on the side of the body; a fastening nut disposed on the connecting screws and for abutting against the inner side of the template body; and a limiting frame unit engaged on the connecting frame unit and used to prevent the fastening nut from falling off during storage and transportation of the connector.

[0014] When the connector is in use, the limiting frame unit is used to support at least the template body.

[0015] A further preferred technical solution is that the connecting frame unit includes a front panel for abutting against the working surfaces of two adjacent template bodies, a back panel for abutting against the back surfaces of two adjacent template bodies, and a connecting plate that connects the front panel and the back panel on both sides, is located between two adjacent template bodies, and is provided with the connecting screw.

[0016] A further preferred technical solution is that: the limiting frame unit includes a main body plate for abutting against the side of the back panel facing away from the front panel, two protective side plates respectively disposed on both sides of the main body plate for blocking the fastening nut from falling off, a protruding plate disposed on the main body plate, and a limiting plate disposed on the protruding plate for abutting against the side of the back panel facing the front panel.

[0017] A further preferred technical solution is that: the protruding plate and the protective side plate are parallel, the distance between the protruding plate and one of the protective side plates is 0.5-1.0 cm greater than the thickness of the template body, and the limiting plate is disposed on the side of the protruding plate facing the other protective side plate.

[0018] A further preferred technical solution is that the distance between the limiting plate and the other protective side plate is 3-6 times the thickness of the template body, and the main body plate is divided by the limiting plate, with one side used to support the template body and the other side used to support the counterweight.

[0019] A further preferred technical solution is that the limiting frame unit also includes a rod hole disposed on the main body plate and used to insert the vertical rod for positioning the installation template.

[0020] A further preferred technical solution is that the limiting frame unit further includes an auxiliary positioning hole disposed on the limiting plate and used together with the rod hole to insert the vertical rod for positioning the template, so as to improve the verticality and vertical stability of the vertical rod for positioning the template.

[0021] A modular plastic-steel formwork structure includes a formwork body, the aforementioned connectors, counterweights, and vertical rods for formwork positioning.

[0022] The template body also has a side groove on its working surface, which is used to improve the flatness of the drainage channel wall surface by means of locking and accommodating the connecting frame unit and the limiting frame unit.

[0023] An application of a modular plastic steel formwork in a flood drainage channel is described in the following method: when the formwork is in use, the connecting frame unit is set between two adjacent formwork bodies, and the limiting frame unit supports one or two adjacent formwork bodies.

[0024] A further preferred technical solution is that the application method is as follows: when the template is in use, the counterweight and the template positioning vertical rod are both set on the limiting frame unit and are both located on the back side of the template body.

[0025] The beneficial effects of this application include at least the following five points.

[0026] First, before use, the connector is in a ready-to-connect state with the template body, meaning that there are no protruding parts on the template body that are relatively easy to deform or break. Therefore, the safety requirements for the storage and transportation of the template can be greatly reduced, and the overall practicality of the modular plastic steel template can be improved.

[0027] Secondly, when using this connector, the connecting screw and the side opening of the main body are at the same height position. The template body can be appropriately pushed vertically to assemble the connector and the template body, making the connection between the template bodies more convenient and faster.

[0028] Third, the limiting frame unit in this connector has at least the following two functions and advantages as a whole:

[0029] A. When storing and transporting the connector, the limiting frame unit properly engages with the connecting frame unit, thereby fully blocking the fastening nut and effectively preventing the fastening nut from falling off and being lost.

[0030] B. When the connector is in use, that is, when the flood drainage channel wall is being poured, the limiting frame unit can not only protect the main body of the formwork from settlement in the vertical direction, but also prevent the main body of the formwork from shifting or tilting in the horizontal direction.

[0031] Among them, the weight of the supporting counterweight should be moderate, and it is necessary to ensure that the pressure formed on the soil by the supporting counterweight, the main body of the formwork, and the limiting frame unit is less than the pressure formed on the soil by the main body of the formwork itself.

[0032] Fourth, the "inverted L-shaped" integral structure formed by the protruding plate and the limiting plate in this connector has at least the following four functions and advantages:

[0033] A. The snap-fit ​​back panel makes it difficult for the limiting frame unit and the connecting frame unit to separate, ensuring that the limiting frame unit's function of blocking and preventing the fastening nuts from falling off is effective for a long time.

[0034] B. Together with one of the protective side plates, i.e. the protective side plate that is relatively close to it, it engages and positions the main body of the template, thereby improving the vertical installation stability of the main body of the template on the limiting frame unit and minimizing the harmful phenomenon of the bottom of the main body of the template tilting outward due to the impact of concrete.

[0035] C. When the template body is supported on the limiting frame unit, the limiting plate is away from the template body, rather than facing the template body, so as to avoid the limiting plate being inserted into the template body and blocking the side plate of the body. Otherwise, the template body cannot be slid out laterally.

[0036] D. By combining auxiliary positioning holes, the verticality of the template positioning rods during installation can be further improved, as well as the long-term vertical stability of the template positioning rods, ultimately enhancing the positional stability of the limiting frame unit on the soil.

[0037] Fifth, in the application of modular plastic steel formwork in flood drainage channels, the connectors can not only achieve a simple and efficient connection between two adjacent formwork bodies, but also stably support the formwork body and prevent it from settling. Furthermore, counterweights and vertical rods for formwork positioning can be set on the limiting frame unit to further improve the lateral stability of the formwork and prevent a whole row of formwork from shifting or tipping over laterally. Attached Figure Description

[0038] Figure 1 This is a schematic diagram showing the storage and transportation status of the connectors in this application.

[0039] Figure 2 This is a schematic diagram of a template body in the prior art.

[0040] Figure 3 This is a schematic diagram showing the location and shape of the side slot in this application.

[0041] Figure 4 This is a schematic diagram illustrating the usage of the connector in this application.

[0042] Figure 5 This is a schematic diagram of the location and structure of the connecting frame unit in this application.

[0043] Figure 6 This is a structural schematic diagram of the limiting frame unit in this application.

[0044] Figure 7 This is a schematic diagram of the installation method of the connecting frame unit in this application.

[0045] Figure 8 This is a schematic diagram showing the support position of the template body on the limiting frame unit in this application.

[0046] Figure 9 This is a diagram illustrating the harmful phenomenon that if the limiting plate faces the opposite direction, it will jam the main body side plate, making it difficult to pull the main body of the template horizontally for removal. This is something that needs to be avoided.

[0047] Figure 10 This is a schematic diagram showing the pouring location of the flood drainage channel wall in this application.

[0048] The meanings of the markings in the diagram are as follows.

[0049] Connecting frame unit 1, connecting screw 2, fastening nut 3, limiting frame unit 4;

[0050] Front panel 101, back panel 102, connecting plate 103;

[0051] Main body plate 401, protective side plate 402, protruding plate 403, limiting plate 404, rod hole 405, auxiliary positioning hole 406;

[0052] Template body a, side opening a-1, side groove a-2, side plate a-3, concrete contact plate a-4, internal reinforcement bar on the back a-5, counterweight b, vertical rod for template positioning c, support rod d;

[0053] Drainage channel wall A, soil layer B. Detailed Implementation

[0054] The following description is merely a preferred embodiment of this application and is not intended to limit the scope of this application.

[0055] As attached Figure 1 - Appendix Figure 10 As shown, a connector includes a connecting frame unit 1 for installation between two adjacent template bodies a, with both sides for insertion into the template body a; two sets of connecting screws 2 respectively disposed on two sides of the connecting frame unit 1 and for passing through side openings a-1 of the main body; fastening nuts 3 disposed on the connecting screws 2 and for abutting against the inner side of the template body a; and a limiting frame unit 4 engaged on the connecting frame unit 1 and used to prevent the fastening nuts 3 from falling off during storage and transportation of the connector.

[0056] When the connector is in use, the limiting frame unit 4 is used to support at least the template body a.

[0057] In this embodiment, the main body material of the connector is the same as that of the template body a, which is also plastic steel. A complete connector typically consists of, for example, one connecting frame unit 1, six connecting screws 2, twelve fastening nuts 3, and one limiting frame unit 4.

[0058] The connecting frame unit 1 is shaped like an I-beam. The connecting screw 2 and the connecting frame unit 1 are integrally formed. The limiting frame unit 4 and the connecting frame unit 1 are snap-fitted together. Three connecting screws 2 are provided on each side of the connecting frame unit 1, and two fastening nuts 3 are provided on each connecting screw 2 to more securely connect two adjacent template bodies a.

[0059] On the other hand, the template body a is an existing commercially available product, which is integrally molded and its structure can be divided into: one concrete contact plate a-4, four main side plates a-3, and several horizontally and vertically arranged internal back reinforcement blocks a-5. Among them, the side of the concrete contact plate a-4 that contacts the concrete is the front, and the other side is the back. The main side plates a-3 and the internal back reinforcement blocks a-5 are all set on the back.

[0060] The concrete contact plate a-4 is square in shape, and the main side plates a-3 can each be provided with the main side openings a-1, which makes the vertical installation of the template body a simpler and more convenient. The connection effect of the template body a is provided by the main side openings a-1 on both sides, while the main side openings a-1 at the top and bottom positions can be left unused.

[0061] Furthermore, the reason why this connector has the function and advantage of "preventing damage to the connection structure before use, thus reducing the safety requirements for the storage and transportation of templates" mainly includes the following two points:

[0062] First, the connector itself is separated from the template body a, and the connector will not form a protruding small structure on the template body a, which makes the connector less likely to be damaged, thus improving the practicality of the entire template. At the same time, it reduces the safety requirements for the storage and transportation of the template, allowing the template to be subjected to minor impacts during storage and transportation.

[0063] Secondly, the fastening nuts 3 in the connector originally had the disadvantage of being easy to fall off and be lost. However, the limiting frame unit 4, through appropriate engagement stability with the connecting frame unit 1, can block all the fastening nuts 3, thereby preventing them from falling off and being lost. This can also reduce the safety requirements for the storage and transportation of the template and improve the overall practicality of the template.

[0064] Finally, the reason why this connector has the function and advantage of "allowing for a relatively convenient and quick establishment of a connection relationship during use" can be mainly attributed to the following two reasons:

[0065] First, when both the template body a and the connector are vertical, the height of the connecting screw 2 is aligned with the height of the side opening a-1 of the body. Therefore, the template body a only needs to be moved horizontally to initially establish the connection effect between two adjacent template bodies a, without having to vertically lift or suspend one of the template bodies a, which is very labor-saving and convenient.

[0066] Secondly, when the connector is in use, the limiting frame unit 4 is not idle or ineffective, but serves as the bottom support structure of the template body a, preventing the template body a from settling on the potentially muddy soil layer B, and ultimately enabling the connector to be vertically aligned more conveniently and accurately with the connecting screw 2 and the side openings a-1 on both sides of the main body, ensuring that the connection function of the connector can be quickly established.

[0067] The connecting frame unit 1 includes a front panel 101 for abutting against the working surfaces of two adjacent template bodies a, a back panel 102 for abutting against the back surfaces of two adjacent template bodies a, and a connecting plate 103 that connects the front panel 101 and the back panel 102 on both sides, is located between two adjacent template bodies a, and is provided with the connecting screw 2.

[0068] In this embodiment, the connecting frame unit 1 is integrally formed. The front panel 101, back panel 102, and connecting plate 103 are all rectangular in shape. The front panel 101 and the back panel 102 are parallel, and the connecting plate 103 is perpendicular to both of them. The lengths of the front panel 101, back panel 102, and connecting plate 103 are the same, equal to or less than the side length of the template body a.

[0069] The width of the back panel 102 is smaller than the width of the front panel 101, which makes it relatively simple and convenient to tighten and loosen the fastening nut 3 on the back side of the template body a, ensuring that the back panel 102 will not significantly hinder the installation and removal of the fastening nut 3.

[0070] Furthermore, it should be noted that the requirements for the flatness and aesthetics of the side of the drainage channel wall A are relatively low. Therefore, the groove formed by the front panel 101 on the drainage channel wall A can be ignored. Alternatively, a side groove a-2 can be provided on the concrete contact plate a-4 to accommodate the front panel 101, making the front panel 101 flush with the concrete contact plate a-4. This ultimately improves the flatness of the side of the drainage channel wall A. For details, please refer to the appendix. Figure 3 .

[0071] The limiting frame unit 4 includes a main body plate 401 for abutting against the side of the back panel 102 facing away from the front panel 101, two protective side plates 402 respectively disposed on both sides of the main body plate 401 for blocking the fastening nut 3 from falling off, a protruding plate 403 disposed on the main body plate 401, and a limiting plate 404 disposed on the protruding plate 403 for abutting against the side of the back panel 102 facing the front panel 101.

[0072] In this embodiment, the main body shape of the limiting frame unit 4 is similar to that of a channel steel. The lengths of the main body plate 401 and the protective side plate 402 are the same, equal to or less than the length of the connecting frame unit 1, as long as the exposed end faces of all the connecting screws 2 are in contact with the protective side plate 402.

[0073] The main body plate 401, the protective side plate 402, the protruding plate 403, and the limiting plate 404 are all rectangular in shape. The main body plate 401 and the protective side plate 402 together form a U-shaped structure, and the protruding plate 403 and the limiting plate 404 together form an inverted L-shaped structure.

[0074] The main function of the aforementioned U-shaped structure is to directly prevent the fastening nut 3 from unscrewing outwards and thus avoid it falling off. The main function of the aforementioned inverted L-shaped structure is as follows: Figure 1 As shown in the figure, the connecting frame unit 1 and the limiting frame unit 4 are relatively fixed in the vertical direction, thereby ensuring that the above-mentioned nut anti-falling function is effective for a long time.

[0075] Accordingly, only one inverted L-shaped structure is required, because: (See attached image) Figure 1 In the horizontal direction, the two protective side plates 402 have provided sufficient relative fixation.

[0076] The protruding plate 403 and the protective side plate 402 are parallel. The distance between the protruding plate 403 and one of the protective side plates 402 is 0.5-1.0 cm greater than the thickness of the template body a. The limiting plate 404 is disposed on the side of the protruding plate 403 facing the other protective side plate 402.

[0077] In this embodiment, the four main side plates a-3 form a groove structure on the template body a, and the internal reinforcement blocks a-5 on the back side are all set in this groove structure.

[0078] Therefore, when the connector is in use and the template body a is already vertically installed on the limiting frame unit 4, if the limiting plate 404 faces the template body a, it may cause the limiting plate 404 to be inserted into the above-mentioned groove structure. Ultimately, when the template body a is removed along the length of the flood discharge channel wall A, it will be blocked and jammed by the limiting plate 404, or at least the removal method will be difficult to carry out effectively.

[0079] This is the main reason for setting the orientation of the limiting plate 404. Please refer to the appendix for details. Figure 8 and 9 .

[0080] The distance between the limiting plate 404 and the other protective side plate 402 is 3-6 times the thickness of the template body a. The main plate 401 is divided by the limiting plate 404, with one side used to support the template body a and the other side used to support the counterweight b.

[0081] In this embodiment, "one of the protective side plates 402" refers to a protective side plate 402 that is relatively close to the protruding plate 403, while "the other protective side plate 402" refers to a protective side plate 402 that is relatively far away from the protruding plate 403.

[0082] On the other hand, counterweight b is a concrete block, and its weight needs to meet the following requirements:

[0083] The overall pressure exerted by the main formwork a, counterweight b, and limiting frame unit 4 on soil layer B is less than the pressure exerted by the main formwork a on soil layer B itself, thereby preventing the entire modular plastic steel formwork from settling on soil layer B.

[0084] The limiting frame unit 4 also includes a rod hole 405 disposed on the main body plate 401 and used to insert the vertical rod c for positioning the installation template.

[0085] In this embodiment, the vertical rod c for positioning the template is a wooden rod, steel pipe, or plastic pipe. It is inserted vertically, with most of it located within the soil layer B, and its upper end passes through the rod hole 405. This allows it to block and fix the template body a laterally, preventing the falling concrete from impacting and moving the template body a.

[0086] Generally, as shown in the appendix Figure 4 and 10 As shown, the formwork support structure of the flood drainage channel wall A is a two-sided type. The main formwork a on one side only needs to be one layer in the vertical direction, that is, the vertical height dimension of the flood drainage channel wall A is smaller than the side length of the main formwork a.

[0087] The limiting frame unit 4 also includes an auxiliary positioning hole 406 disposed on the limiting plate 404 and used together with the rod hole 405 to insert the vertical rod c for positioning the template, so as to improve the verticality and vertical stability of the vertical rod c for positioning the template.

[0088] In this embodiment, an auxiliary positioning hole 406 is also provided above part of the rod hole 405, so that the template positioning vertical rod c can pass through the auxiliary positioning hole 406 and the rod hole 405 at the same time, so that the template positioning vertical rod c of this part has a relatively high degree of verticality when inserted, and the above degree of verticality can be maintained for a long time after insertion.

[0089] On the other hand, as is known from common knowledge, compared with the inclined template positioning rod c, the vertical template positioning rod c provides greater stability and longer stability for the lateral limiting function of the limiting frame unit 4.

[0090] A modular plastic steel formwork structure includes a formwork body a, a connector, a counterweight b, and a vertical rod c for formwork positioning.

[0091] Among them, the working surface of the template body a is also provided with a side groove a-2 for improving the flatness of the surface of the flood discharge channel wall A by means of engaging and accommodating the connecting frame unit 1 and the limiting frame unit 4.

[0092] In this embodiment, one of the side effects of the supporting effect of the limiting frame unit 4 on the template body a is that one of the protective side plates 402 will protrude relatively on the concrete contact plate a-4, affecting the flatness of the side of the drainage channel wall A. Therefore, the side slot a-2 can also be opened at the bottom edge of the concrete contact plate a-4, ultimately ensuring that the protective side plate 402, like the front panel 101, will not form a groove on the drainage channel wall A.

[0093] On the other hand, the length of the limiting frame unit 4 may be less than the side length of the template body a, i.e., as shown in the attached figure. Figure 4 As shown. Therefore, the side slot a-2 can form a separate groove at the bottom edge of the concrete contact plate a-4, unlike the attached... Figure 3 The U-shaped overall slot shown.

[0094] An application of a modular plastic steel formwork in a flood drainage channel is described as follows: when the formwork is in use, the connecting frame unit 1 is set between two adjacent formwork bodies a, and the limiting frame unit 4 supports one or two adjacent formwork bodies a.

[0095] In this embodiment, when the length of the limiting frame unit 4 is less than the side length of the template body a, the amount of concrete leaking at the bottom position of the limiting frame unit 4 supporting the template body a can be ignored, because the surface of the soil layer B is not completely hard, and the soil layer will fully fill the gap there.

[0096] In use, the counterweight b and the template positioning vertical rod c are both set on the limiting frame unit 4 and are both located on the back side of the template body a.

[0097] In this embodiment, as shown in the appendix Figure 10 As shown, the modular plastic-steel formwork may further include a support rod d. The support rod d is inclined, with its lower end inserted into the soil layer B and its upper end supporting the back of the formwork body a.

[0098] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of this application. These are non-inventive modifications and are protected by patent law as long as they are within the scope of the claims of this application.

Claims

1. A connector, characterized in that: The structure includes a connecting frame unit (1) for installation between two adjacent template bodies (a) and for inserting into the template body (a) on both sides; two sets of connecting screws (2) respectively set on the two sides of the connecting frame unit (1) and for passing through the side openings (a-1) of the main body; a fastening nut (3) set on the connecting screws (2) and for abutting against the inner side of the template body (a); and a limiting frame unit (4) engaged on the connecting frame unit (1) and for blocking the fastening nut (3) from falling off during the storage and transportation of the connector. When the connector is in use, the limiting frame unit (4) is used to support the template body (a) at least.

2. A connector according to claim 1, characterized in that: The connecting frame unit (1) includes a front panel (101) for abutting the working surfaces of two adjacent template bodies (a), a back panel (102) for abutting the back sides of two adjacent template bodies (a), and a connecting plate (103) that connects the front panel (101) and the back panel (102) on both sides respectively, is located between two adjacent template bodies (a), and is provided with the connecting screw (2).

3. A connector according to claim 2, characterized in that: The limiting frame unit (4) includes a main body plate (401) for abutting against the side of the back panel (102) facing away from the front panel (101), two protective side plates (402) respectively disposed on both sides of the main body plate (401) for blocking the fastening nut (3) from falling off, a protruding plate (403) disposed on the main body plate (401), and a limiting plate (404) disposed on the protruding plate (403) for abutting against the side of the back panel (102) facing the front panel (101).

4. A connector according to claim 3, characterized in that: The protruding plate (403) and the protective side plate (402) are parallel. The distance between the protruding plate (403) and one of the protective side plates (402) is 0.5-1.0 cm greater than the thickness of the template body (a). The limiting plate (404) is disposed on the side of the protruding plate (403) facing the other protective side plate (402).

5. A connector according to claim 4, characterized in that: The distance between the limiting plate (404) and the other protective side plate (402) is 3-6 times the thickness of the template body (a). On the main plate (401), with the limiting plate (404) as the boundary, one side is used to support the template body (a), and the other side is used to support the counterweight (b).

6. A connector according to claim 3, characterized in that: The limiting frame unit (4) also includes a rod hole (405) disposed on the main body plate (401) and used to insert the vertical rod (c) for positioning the installation template.

7. A connector according to claim 6, characterized in that: The limiting frame unit (4) also includes an auxiliary positioning hole (406) disposed on the limiting plate (404) and used together with the rod hole (405) to insert the template positioning vertical rod (c) for installation, so as to improve the verticality and vertical stability of the template positioning vertical rod (c).

8. A modular plastic steel formwork, comprising a formwork body (a), characterized in that: It also includes the connector as described in any one of claims 1-7, the supporting counterweight (b), and the template positioning vertical rod (c). Among them, the working surface of the template body (a) is also provided with a side groove (a-2) for improving the flatness of the surface of the flood discharge channel wall (A) by means of engaging and accommodating the connecting frame unit (1) and the limiting frame unit (4).

9. The application of a modular plastic-steel formwork as described in claim 8 in a flood drainage channel, characterized in that... The application method is as follows: When the template is used, the connecting frame unit (1) is set between two adjacent template bodies (a), and the limiting frame unit (4) supports a single template body (a) or two adjacent template bodies (a).

10. The application of a modular plastic-steel formwork according to claim 9 in a flood drainage channel, characterized in that... The application method is as follows: When the template is used, the supporting counterweight (b) and the template positioning vertical rod (c) are both set on the limiting frame unit (4) and are both located on the back side of the template body (a).

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