Side formwork structure of civil air defense door frame combined steel formwork

Abstract

This utility model relates to a side formwork structure for a combined steel formwork for a civil defense door frame, including a front formwork assembly and a rear formwork assembly. Both the front and rear formwork assemblies include a pair of vertical formworks distributed on the left and right. An inner sealing plate is provided between the inner ends of the vertical formworks on the same side of the front and rear formwork assemblies. The inner sealing plate is longitudinally arranged and perpendicular to the vertical formworks. The inner end face of the vertical formworks is in contact with the outer end face of the inner sealing plate. The front and rear ends of the inner sealing plate are connected to the vertical formworks on the same side via a first connector. By using an inner sealing plate that longitudinally spans the vertical formworks on the same side, and with the front and rear ends of the inner sealing plate locked and fixed to the vertical formworks, this design effectively ensures the right angle between the inner sealing plate and the vertical formworks on the same side. This ensures the right angle of the left and right inner ends of the civil defense door frame wall after concrete pouring, preventing any impact on the subsequent normal installation of the civil defense door frame.

Description

Technical Field

[0001] This utility model relates to a side formwork structure of a combined steel formwork for civil defense door frames. Background Technology

[0002] Civil defense doors are the entrances and exits of civil defense projects. As my country develops and the country attaches greater importance to civil defense, people's awareness of safety and prevention is increasing, and the quality standards for civil defense projects are becoming higher. On December 29, 2024, the National Civil Air Defense Office issued and implemented the "General Technical Requirements for Civil Air Defense Protective Equipment (Protective Doors)".

[0003] Developed based on general technical requirements, the air-raid shelter door employs an innovative construction process where the wall is poured first, followed by the installation of the door frame. An air-raid shelter door typically consists of a door frame and a door body. The door frame is secured to pre-drilled holes in the air-raid shelter door frame wall using fasteners. To achieve higher quality standards and greater efficiency in implementing the "General Technical Requirements for Civil Air Defense Protective Equipment (Protective Doors)," the construction of the air-raid shelter door frame wall typically involves first erecting a pouring formwork, then binding reinforcing bars and installing pre-embedded sleeves inside the formwork. After the concrete is poured, these pre-embedded sleeves become the pre-drilled holes for installing the air-raid shelter door frame, which are then secured with tie rods.

[0004] Existing formwork for the pouring of civil defense door frame walls typically includes a front formwork assembly and a rear formwork assembly. Both the front and rear formwork assemblies include a pair of vertical formworks distributed on the left and right. A horizontal formwork is set between the top of the pair of vertical formworks. The door frame structure is formed by the pair of vertical formworks and the horizontal formworks. However, the inner ends of the vertical formwork on the same side of the front and rear formwork components are not sealed with a plate. Typically, a temporary wooden formwork is erected on-site, and this formwork, along with the two vertical formwork on the same side, is used to enclose the pouring area. This method of pouring results in poorly maintained right angles (i.e., the right angle between the left inner side and the front and rear sides, and the right inner side and the front and rear sides) on the left and right inner sides of the air-raid shelter door frame wall. This easily leads to non-right-angle structures and makes the flatness of the end faces of the pre-embedded sleeves less than ideal, failing to meet the requirements of the "Notice of the National Civil Air Defense Office on Issuing the General Technical Requirements for Civil Air Defense Protective Equipment (Protective Doors)" which came into effect on January 1, 2025. This affects the normal installation of the air-raid shelter door frame after subsequent formwork removal. Therefore, it is necessary to improve this technical issue. Utility Model Content

[0005] This utility model addresses the problems existing in the prior art by providing a side formwork structure for a combined steel formwork for a civil defense door frame. The design is reasonable, ensuring that the right angles of the left and right inner ends of the civil defense door frame wall are well guaranteed after pouring.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a side template structure for a combined steel template for a civil defense door frame, comprising a front template assembly and a rear template assembly. Each of the front and rear template assemblies includes a pair of vertical templates distributed on the left and right. An inner sealing plate is provided between the inner ends of the vertical templates on the same side of the front and rear template assemblies. The inner sealing plate is arranged longitudinally and is perpendicular to the vertical template. The inner end face of the vertical template is in contact with the outer end face of the inner sealing plate. The front and rear ends of the inner sealing plate are respectively connected to the vertical templates on the same side via a first connecting member.

[0007] Furthermore, the front end face of the vertical template of the front template assembly and the rear end face of the vertical template of the rear template assembly are each provided with a pair of first angle irons distributed on the left and right. The first angle irons are arranged vertically, and the horizontal edge of the first angle irons is fixedly connected to the vertical template.

[0008] Furthermore, the longitudinal edge of the first angle iron located at the inner end of the vertical template is in contact with the outer end face of the vertical template. The inner side of the inner sealing plate is provided with a pair of second angle irons symmetrically distributed in front and back. The positions of the second angle irons and the first angle irons are corresponding. The longitudinal edge of the second angle irons, the inner sealing plate, and the longitudinal edge of the first angle irons located on the same side are connected by a first connector.

[0009] Furthermore, the first connector includes a plurality of first connecting bolts distributed vertically. The first connecting bolts pass through the longitudinal edge of the second angle iron, the inner sealing plate, and the longitudinal edge of the first angle iron on the same side, and are then locked with the first nut.

[0010] Furthermore, a horizontal template is provided between the tops of the pair of vertical templates of the front template assembly and between the tops of the pair of vertical templates of the rear template assembly. The bottom surface of the horizontal template is in contact with the top surface of the pair of vertical templates on the same side. A top sealing plate is horizontally provided between the bottoms of the horizontal templates of the front template assembly and the horizontal templates of the rear template assembly. The top sealing plate is perpendicular to the inner sealing plate, and the bottom surfaces of the left and right ends of the top sealing plate are respectively in contact with the top surfaces of the inner sealing plates on the same side.

[0011] Furthermore, the left and right end faces of the top sealing plate are flush with the outer end faces of the inner sealing plate located on the same side.

[0012] Furthermore, the front and rear ends of the top sealing plate are respectively connected to the transverse template located on the same side via a second connector.

[0013] Furthermore, the outer side of the horizontal template is provided with a pair of upper and lower triangular irons, the third triangular irons are arranged horizontally, the vertical side of the third triangular irons is fixedly connected to the horizontal template, and the longitudinal side of the third triangular irons is in contact with the top surface of the top sealing plate; the bottom surface of the top sealing plate is provided with a pair of front and rear distributed fourth triangular irons, the fourth triangular irons are arranged horizontally, and the longitudinal side of the fourth triangular irons, the top sealing plate, and the longitudinal side of the triangular irons on the same side are connected by a second connector.

[0014] Furthermore, the second connector includes a plurality of second connecting bolts distributed laterally. The second connecting bolts pass through the longitudinal edge of the third angle iron, the top sealing plate, and the longitudinal edge of the fourth angle iron located on the same side, and then engage with the second nut to lock it in place.

[0015] Furthermore, a pair of horizontal connecting plates distributed on the left and right are provided below the first triangular iron at the lower end of the horizontal template. The horizontal connecting plates are vertically fixed to the upper end of the vertical template on the same side. The horizontal connecting plates and the longitudinal edge of the third angle iron are locked together by a vertically set third connecting bolt and a third nut.

[0016] Compared with the prior art, the present invention has the following advantages: The present invention is reasonably designed. It adopts an inner sealing plate that spans the vertical template located on the same side along the longitudinal direction, and the front and rear ends of the inner sealing plate are locked and fixed to the vertical template. This form can well ensure the right angle between the inner sealing plate and the vertical template located on the same side, so that the right angle of the left and right inner ends of the civil defense door frame wall after the concrete is poured is well guaranteed. At the same time, the flatness of the end faces of the front and rear ends of the pre-embedded sleeve is good, so as to avoid affecting the normal installation of the subsequent civil defense door frame. Attached Figure Description

[0017] Figure 1 This is a top view cross-sectional structural diagram of an embodiment of the present invention;

[0018] Figure 2 yes Figure 1 Enlarged diagram of point A in the diagram;

[0019] Figure 3 This is a schematic diagram of the cooperation between the horizontal template and the top sealing plate in an embodiment of this utility model;

[0020] Figure 4 yes Figure 3 Enlarged diagram of point B in the diagram;

[0021] Figure 5 This is a schematic diagram of the main structure of the combined steel formwork;

[0022] Figure 6 This is a top view schematic diagram of the combined steel formwork structure;

[0023] Figure 7 This is a top view schematic diagram of the combined steel formwork structure;

[0024] Figure 8 This is a schematic diagram of the cooperation between the top sealing plate and the inner sealing plate in an embodiment of this utility model;

[0025] Figure 9 This is a cross-sectional schematic diagram of the civil defense door frame wall after it has been poured. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0027] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] The side formwork structure complies with the requirements of the "Notice of the National Civil Air Defense Office on Issuing the General Technical Requirements for Civil Air Defense Protection Equipment (Protection Category)" which came into effect on January 1, 2025.

[0029] like Figures 1-8As shown, this utility model discloses a side formwork structure for a combined steel formwork for a civil defense door frame. The combined steel formwork has a door-shaped frame structure, with pre-embedded sleeves longitudinally distributed inside the combined steel formwork. After pouring, the pre-embedded sleeves form reserved holes for installing the civil defense door frame. The reserved holes are locked to the civil defense door frame by tie rods 25. The side formwork structure includes a front formwork assembly 1 and a rear formwork assembly 2 arranged parallel to each other and spaced apart. Each of the front formwork assembly 1 and the rear formwork assembly 2 includes a pair of vertical formworks 11 distributed on the left and right. The vertical formworks 11 are arranged laterally. An inner sealing plate 13 is provided between the inner ends of the vertical formworks 11 on the same side of the front formwork assembly 1 and the rear formwork assembly 2. The inner sealing plate 13 is arranged longitudinally and perpendicular to the vertical formworks 11. The inner end face of the vertical formwork 11 is attached to the outer end face of the inner sealing plate 13. The front and rear ends of the inner sealing plate 13 are respectively connected to the vertical formworks 11 on the same side via a first connector. The inner sealing plate is used to span the vertical formwork located on the same side longitudinally, and the front and rear ends of the inner sealing plate are connected and fixed to the vertical formwork. This method can well ensure the right angle between the inner sealing plate and the vertical formwork located on the same side. This ensures that the right angle 27 (i.e., the right angle 27 between the inner side of the left end and the front and rear sides, and the right angle 27 between the inner side of the right end and the front and rear sides) of the left and right inner ends of the air-raid shelter door frame wall after the concrete is poured is well guaranteed. At the same time, the flatness of the end face 26 where the front and rear ends of the pre-embedded sleeve are located is good, so as to avoid affecting the normal installation of the air-raid shelter door frame after the formwork is removed.

[0030] In this embodiment, both the front end face of the vertical template 11 of the front template assembly 1 and the rear end face of the vertical template 11 of the rear template assembly 2 are provided with a pair of left and right distributed first angle irons 14. The first angle irons 14 are vertically arranged, and their horizontal edges are welded and fixed to the vertical template 11. The longitudinal edges of the pair of first angle irons 14 are flush with the left and right sides of the vertical template 11, respectively. This structure, combining the first angle irons with the vertical template, uses a 90-degree integrally formed angle iron, which facilitates better right-angle formation after concrete pouring. Traditionally, the vertical template is bent at 90 degrees at both ends to form folded edges. In this method, there is a certain rounded corner between the folded edges and the vertical template, making it difficult to guarantee a good right angle after concrete pouring.

[0031] In this embodiment, the inner side of the inner sealing plate 13 is provided with a pair of second angle irons 15 symmetrically distributed in front and back. The second angle irons 15 correspond to the positions of the first angle irons 14. The longitudinal edge of the second angle irons 15, the inner sealing plate 13 and the longitudinal edge of the first angle irons 14 located on the same side are connected by a first connector.

[0032] In this embodiment, the first connector includes a plurality of first connecting bolts 16 distributed vertically. The first connecting bolts 16 pass through the longitudinal edge of the second angle iron 15, the inner sealing plate 13 and the longitudinal edge of the first angle iron 14 located on the same side, and are then locked with the first nut 17.

[0033] In this embodiment, a horizontal template 12 is provided between the tops of the pair of vertical templates 11 of the front template assembly 1 and between the tops of the pair of vertical templates 11 of the rear template assembly 2. The pair of vertical templates 11 and the horizontal template 12 form a door-shaped frame structure. The bottom surface of the horizontal template 12 is attached to the top surface of the pair of vertical templates 11 located on the same side, that is, the horizontal template spans across the top of the pair of vertical templates. A top sealing plate 18 is horizontally provided between the bottom of the horizontal templates 12 of the front template assembly 1 and the horizontal templates 12 of the rear template assembly 2. The top sealing plate 18 is perpendicularly distributed with the inner sealing plate 13. The bottom surfaces of the left and right ends of the top sealing plate 18 are respectively attached to the top surfaces of the inner sealing plate 13 located on the same side. The horizontal formwork with an integral structure spans above a pair of vertical formworks, and the top sealing plate spans the top surface of the inner sealing plates on both sides. This reduces the splicing seams at the right angles at the upper left and right ends of the entire combined steel formwork, avoiding the formation of steps. This ensures that the right angles at the top left and right ends of the poured civil defense door frame wall (i.e., the right angle between the inner side of the left end and the top surface, and the right side of the inner side and the top surface) are well guaranteed, preventing the normal installation of the subsequent dismantling of the civil defense door frame from being affected.

[0034] In this embodiment, the left and right end faces of the top sealing plate 18 are flush with the outer end faces of the inner sealing plate 13 located on the same side.

[0035] In this embodiment, the front and rear ends of the top sealing plate 18 are respectively connected to the horizontal template 12 located on the same side via a second connector.

[0036] In this embodiment, the outer side of the horizontal template 12 is provided with a pair of upper and lower distributed triangular irons 19. The triangular irons 19 are arranged horizontally, and the vertical side of the triangular irons 19 is welded and fixed to the horizontal template 12. The longitudinal side of the triangular irons 19 is in contact with the top surface of the top sealing plate 18. The bottom surface of the top sealing plate 18 is provided with a pair of front and rear distributed fourth angle irons 20. The fourth angle irons 20 are arranged horizontally, and the longitudinal side of the fourth angle irons 20, the top sealing plate 18, and the longitudinal side of the triangular irons 19 located on the same side are connected by a second connector.

[0037] In this embodiment, the second connector includes a plurality of second connecting bolts 21 distributed laterally. The second connecting bolts 21 pass through the longitudinal edge of the third angle iron 19, the top sealing plate 18 and the longitudinal edge of the fourth angle iron 20 located on the same side, and are then locked with the second nut 22.

[0038] In this embodiment, a pair of horizontal connecting plates 23 distributed on the left and right are provided below the triangular iron 19 located at the lower end of the horizontal template 12. The horizontal connecting plates 23 are vertically fixed to the upper end of the vertical template 11 located on the same side. The horizontal connecting plates 23 and the longitudinal edge of the third angle iron 19 are locked together by a vertically arranged third connecting bolt 24 and a third nut.

[0039] If this utility model discloses or relates to mutually fixedly connected parts or structural components, then, unless otherwise stated, a fixed connection can be understood as: a detachable fixed connection (e.g., using bolts or screws), or a non-detachable fixed connection (e.g., riveting, welding). Of course, mutually fixed connections can also be replaced by an integral structure (e.g., manufactured using a casting process) (except where it is obviously impossible to use an integral forming process).

[0040] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in this utility model above include states or shapes that are similar to, close to, or approximate with them.

[0041] Any component provided by this utility model can be assembled from multiple individual components, or it can be a single component manufactured by a one-piece molding process.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A side formwork structure for a combined steel formwork for a civil defense door frame, comprising a front formwork assembly and a rear formwork assembly, wherein both the front and rear formwork assemblies include a pair of vertical formworks distributed on the left and right, characterized in that: An inner sealing plate is provided between the inner ends of the vertical template on the same side of the front template assembly and the rear template assembly. The inner sealing plate is arranged longitudinally and is distributed perpendicular to the vertical template. The inner end face of the vertical template is in contact with the outer end face of the inner sealing plate. The front and rear ends of the inner sealing plate are respectively connected to the vertical template on the same side via a first connector.

2. The side formwork structure of the combined steel formwork for civil defense door frames according to claim 1, characterized in that: The front end face of the vertical template of the front template assembly and the rear end face of the vertical template of the rear template assembly are each provided with a pair of first angle irons distributed on the left and right. The first angle irons are arranged vertically, and the horizontal edge of the first angle irons is fixedly connected to the vertical template.

3. The side formwork structure of the combined steel formwork for civil defense door frames according to claim 2, characterized in that: The longitudinal edge of the first angle iron located at the inner end of the vertical template is in contact with the outer end face of the vertical template. The inner side of the inner sealing plate is provided with a pair of second angle irons symmetrically distributed in front and back. The positions of the second angle irons and the first angle irons are corresponding. The longitudinal edge of the second angle iron, the inner sealing plate and the longitudinal edge of the first angle iron located on the same side are connected by a first connector.

4. The side formwork structure of the combined steel formwork for civil defense door frames according to claim 3, characterized in that: The first connector includes a plurality of first connecting bolts distributed vertically. The first connecting bolts pass through the longitudinal edge of the second angle iron, the inner end plate, and the longitudinal edge of the first angle iron on the same side, and are then locked with the first nut.

5. The side formwork structure of the combined steel formwork for civil defense door frames according to claim 1, characterized in that: A horizontal template is provided between the tops of the pair of vertical templates of the front template assembly and between the tops of the pair of vertical templates of the rear template assembly. The bottom surface of the horizontal template is in contact with the top surface of the pair of vertical templates on the same side. A top sealing plate is horizontally provided between the bottoms of the horizontal templates of the front template assembly and the horizontal templates of the rear template assembly. The top sealing plate is perpendicular to the inner sealing plate, and the bottom surfaces of the left and right ends of the top sealing plate are respectively in contact with the top surfaces of the inner sealing plates on the same side.

6. The side formwork structure of the combined steel formwork for civil defense door frames according to claim 5, characterized in that: The left and right end faces of the top sealing plate are flush with the outer end faces of the inner sealing plate located on the same side.

7. The side formwork structure of the combined steel formwork for civil defense door frames according to claim 5, characterized in that: The front and rear ends of the top sealing plate are respectively connected to the horizontal template located on the same side via a second connector.

8. The side formwork structure of the combined steel formwork for civil defense door frames according to claim 7, characterized in that: The outer side of the horizontal template is provided with a pair of upper and lower triangular irons. The third triangular iron is arranged horizontally, and its vertical side is fixedly connected to the horizontal template. The longitudinal side of the third triangular iron is in contact with the top surface of the top sealing plate. The bottom surface of the top sealing plate is provided with a pair of front and rear fourth triangular irons. The fourth triangular irons are arranged horizontally, and their longitudinal sides, the top sealing plate, and the longitudinal sides of the triangular irons on the same side are connected by a second connector.

9. The side formwork structure of the combined steel formwork for civil defense door frames according to claim 8, characterized in that: The second connector includes a plurality of second connecting bolts distributed laterally. The second connecting bolts pass through the longitudinal edge of the third angle iron, the top end plate, and the longitudinal edge of the fourth angle iron located on the same side, and are then engaged with the second nut to lock in place.

10. The side formwork structure of the combined steel formwork for civil defense door frames according to claim 8, characterized in that: A pair of horizontal connecting plates, one on the left and one on the right, are provided below the first triangular iron at the lower end of the horizontal template. The horizontal connecting plates are vertically fixed to the upper end of the vertical template on the same side. The horizontal connecting plates and the longitudinal edge of the third angle iron are locked together by a third connecting bolt and a third nut set vertically.

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