A civil air defense door frame pre-buried sleeve fixing structure

Abstract

This utility model relates to a fixing structure for a pre-embedded sleeve in a civil defense door frame, including a civil defense door frame wall casting template. The casting template includes a front template and a rear template. The pre-embedded sleeve is longitudinally arranged between the front and rear templates. Both the front and rear templates are equipped with positioning cylinders corresponding to the positions of the pre-embedded sleeve. The positioning cylinders on the front and rear templates extend into the front and rear ends of the pre-embedded sleeve, respectively. A connector is axially inserted into the pre-embedded sleeve. The front and rear ends of the connector pass through the positioning cylinders on the same side and are locked to the positioning cylinders on the same side by fasteners. The pre-embedded sleeve is locked and fixed from the front and rear directions, ensuring that it is firmly clamped between the front and rear templates. During concrete pouring, the pre-embedded sleeve is less likely to shift or move when impacted by the concrete, improving the positional accuracy of the reserved holes after concrete pouring and avoiding subsequent interference with the normal installation of the civil defense door frame.

Description

Technical Field

[0001] This utility model relates to a pre-embedded sleeve fixing structure 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] In traditional techniques, embedded sleeves are typically fixed to the reinforcing bars inside the casting formwork. During concrete pouring, the embedded sleeves are prone to displacement due to the impact of the concrete. This results in deviations in the pre-drilled holes after the concrete is poured, 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 will be implemented from January 1, 2025, thus affecting the normal installation of civil air defense door frames. Therefore, it is necessary to improve this technical problem. Utility Model Content

[0005] This utility model addresses the problems existing in the prior art by providing a pre-embedded sleeve fixing structure for civil defense door frames, which is reasonably designed and improves the firmness of the pre-embedded sleeve fixing.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a fixing structure for a pre-embedded sleeve of a civil defense door frame, comprising a civil defense door frame wall casting template and a pre-embedded sleeve. The civil defense door frame wall casting template includes a front template and a rear template. The pre-embedded sleeve is longitudinally arranged between the front template and the rear template. Both the front template and the rear template are provided with positioning cylinders corresponding to the positions of the pre-embedded sleeves. The positioning cylinders on the front template and the rear template extend into the front and rear ports of the pre-embedded sleeve, respectively. A connector is axially inserted inside the pre-embedded sleeve. The front and rear ends of the connector pass through the positioning cylinders located on the same side and are locked and fixed to the positioning cylinders located on the same side by fasteners.

[0007] Furthermore, the end of the positioning cylinder that extends into the pre-embedded sleeve is truncated cone-shaped.

[0008] Furthermore, both the front and rear templates are provided with longitudinal through holes corresponding to the positions of the pre-embedded sleeves, and the positioning cylinder is fixedly inserted through the longitudinal through holes.

[0009] Furthermore, the connector is a longitudinally arranged connecting screw; the fastener is screwed to the connecting screw.

[0010] Furthermore, the fastener includes a locking washer and a locking nut. The locking washer contacts the end face of the positioning cylinder away from the pre-embedded sleeve. A clearance hole is provided in the middle of the locking washer to facilitate the passage of the connecting screw. The locking nut is screwed to the connecting screw and abuts against the end face of the locking washer away from the positioning cylinder.

[0011] Furthermore, the front and rear ends of the pre-embedded sleeve are fixed with annular end flanges, and the end flanges at the front and rear ends of the pre-embedded sleeve are respectively attached to the front template and the rear template.

[0012] Furthermore, a circular intermediate flange is fixed to the outer surface of the middle part of the pre-embedded sleeve.

[0013] Furthermore, both the front template and the rear template include a pair of vertical templates distributed on the left and right, a horizontal template is provided between the top of the pair of vertical templates, and an inner sealing plate is provided between the inner ends of the vertical templates on the same side of the front template and the rear template. The inner sealing plate is arranged longitudinally and is distributed perpendicular to the vertical template.

[0014] Furthermore, the front end face of the vertical template of the front template and the rear end face of the vertical template of the rear template are both provided with a pair of first angle irons distributed on the left and right. The horizontal edge of the first angle iron is fixedly connected to the vertical template, and the longitudinal edge of the first angle iron located on the inner end of the vertical template is in contact with the side of the vertical template. The outer sides of the front and rear ends of the inner sealing plate are in contact with the longitudinal edge of the first angle iron located on the same side. The inner side of the inner sealing plate is provided with a pair of second angle irons symmetrically distributed on the left and right. 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 locked and fixed by connecting bolts and nuts.

[0015] Furthermore, the vertical template, horizontal template, and inner sealing plate are all made of steel plates.

[0016] Compared with the prior art, the present invention has the following advantages: The present invention is reasonably designed. The front and rear ends of the pre-embedded sleeve are positioned by insertion through positioning cylinders, and then the pre-embedded sleeve is locked and fixed from the front and rear directions. This ensures that the pre-embedded sleeve is firmly clamped between the front and rear templates. When the pre-embedded sleeve is impacted by the concrete during concrete pouring, it is less likely to shift or move. This improves the positioning accuracy of the pre-embedded sleeve and avoids affecting the normal installation of the civil defense door frame. Attached Figure Description

[0017] Figure 1 This is a 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 yes Figure 1 Enlarged diagram of point B in the diagram;

[0020] Figure 4 This is a schematic diagram of the structure of the pre-embedded sleeve in an embodiment of this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the positioning cylinder in an embodiment of this utility model;

[0022] Figure 6 This is a schematic diagram of the main structure of the formwork for the pouring of the civil defense door frame wall;

[0023] Figure 7 This is a top view schematic diagram of the formwork for the pouring of the civil defense door frame wall;

[0024] Figure 8 This is a side view schematic diagram of the formwork for the pouring of the civil defense door frame wall;

[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 pre-embedded sleeve fixing 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 Doors)" which came into effect on January 1, 2025.

[0029] like Figures 1-8 As shown, this utility model discloses a pre-embedded sleeve fixing structure for a civil defense door frame, comprising a door-shaped frame structure for casting a civil defense door frame wall and pre-embedded sleeves. The civil defense door frame wall casting template includes a front template 1 and a rear template 2 arranged parallel to each other and spaced apart. The pre-embedded sleeves 3 are longitudinally arranged between the front template 1 and the rear template 2. There are multiple pre-embedded sleeves 3. After casting, the pre-embedded sleeves 3 form reserved holes for installing the civil defense door frame. The reserved holes are locked to the civil defense door frame by tie rods 18. The front template 1 and the rear template 2 are each provided with positioning cylinders 4 corresponding to the positions of the pre-embedded sleeves 3. The number of positioning cylinders 4 on the front template 1 and the rear template 2 corresponds to the number of pre-embedded sleeves 3. The positioning cylinders 4 on the front template 1 and the rear template 2 extend into the front and rear ports of the pre-embedded sleeves 3, respectively. That is, the pre-embedded sleeves 3 are sandwiched between the front template 1 and the rear template 2. A connector is axially inserted inside the pre-embedded sleeve 3. The front and rear ends of the connector pass through the positioning cylinders 4 located on the same side, respectively. The front and rear ends of the connector are locked and fixed to the positioning cylinders 4 located on the same side by fasteners. That is, the pre-embedded sleeves 3 are firmly clamped and fixed in the front and rear directions by the front template 1 and the rear template 2. The front and rear ends of the pre-embedded sleeve are positioned by inserting a positioning cylinder, and then the pre-embedded sleeve is locked and fixed from the front and rear directions. This ensures that the pre-embedded sleeve is firmly clamped between the front and rear templates. When the pre-embedded sleeve is impacted by the concrete during concrete pouring, it is less likely to shift or move. This improves the positioning accuracy of the pre-embedded sleeve (including position dimensions, flatness, and verticality), ensuring the positional accuracy of the reserved holes after concrete pouring and avoiding subsequent interference with the normal installation of the civil defense door frame.

[0030] In this embodiment, the end of the positioning cylinder 4 that extends into the pre-embedded sleeve 3 is truncated cone-shaped, that is, the outer surface of the end of the positioning cylinder near the pre-embedded sleeve is conical 5, so as to better extend into the port of the pre-embedded sleeve.

[0031] In this embodiment, both the front template 1 and the rear template 2 are provided with longitudinal through holes corresponding to the positions of the pre-embedded sleeves. The positioning cylinder 4 passes through the longitudinal through holes and is welded and fixed to the longitudinal through holes.

[0032] In this embodiment, the connecting member is a longitudinally arranged connecting screw 6, which passes through the front positioning cylinder 4, the pre-embedded sleeve 3, and the rear positioning cylinder 4 along the longitudinal direction; the fastener is screwed to the connecting screw 6.

[0033] In this embodiment, the fastener includes a locking washer 7 and a locking nut 8. The locking washer 7 is in contact with the end face of the positioning cylinder 4 away from the pre-embedded sleeve 3. The locking washer 7 has a clearance hole in the middle to facilitate the passage of the connecting screw 6. The locking nut 8 is screwed to the connecting screw 6. The locking nut 8 abuts against the end face of the locking washer 7 away from the positioning cylinder 4, and is used to lock and fix the fastener.

[0034] In this embodiment, the pre-embedded sleeve 3 is a circular steel pipe. The front and rear ends of the pre-embedded sleeve 3 are fixed with annular end flanges 9. The end flanges 9 at the front and rear ends of the pre-embedded sleeve 3 are respectively attached to the front template 1 and the rear template 2.

[0035] In this embodiment, in order to improve structural strength, a circular intermediate flange 10 is fixed on the outer surface of the middle part of the pre-embedded sleeve 3.

[0036] In this embodiment, the front template 1 and the rear template 2 have the same structure, and each includes a pair of vertical templates 11 distributed on the left and right. The vertical templates 11 are arranged horizontally, and a horizontal template 12 is arranged between the tops of the pair of vertical templates 11. The bottom surface of the horizontal template 12 is attached to the top surface of the pair of vertical templates 11, that is, the horizontal template 12 spans across the top of the pair of vertical templates 11, and the pair of vertical templates 11 and the horizontal template 12 form a door-shaped frame structure. An inner sealing plate 13 is arranged between the inner ends of the vertical templates 11 on the same side of the front template 1 and the rear template 2. The inner sealing plate 13 is arranged longitudinally and is distributed perpendicular to the vertical templates 11. The inner end face of the vertical template 11 is attached to the outer end face of the inner sealing plate 13.

[0037] In this embodiment, a plurality of pre-embedded sleeves 2 are distributed vertically between the front template 1 and the rear template 2 on the same side of the vertical template 11, and a plurality of pre-embedded sleeves are distributed horizontally between the horizontal template of the front template 1 and the horizontal template of the rear template 2.

[0038] In this embodiment, both the front face of the vertical template 11 of the front template 1 and the rear face of the vertical template 11 of the rear template 2 are horizontally 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 one-piece 90-degree structure, 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 right angle after concrete pouring.

[0039] In this embodiment, the outer surfaces of the front and rear ends of the inner sealing plate 13 are fitted with the longitudinal edges of the first angle iron 14 located on the same side. The inner surface of the inner sealing plate 13 is provided with a pair of second angle irons 15 symmetrically distributed on the left and right. The longitudinal edges of the second angle irons 15, the inner sealing plate 13, and the longitudinal edges of the first angle iron 14 located on the same side are locked and fixed together by connecting bolts 16 and nuts 17. The inner sealing plate spans the vertical template located on the same side longitudinally, and the front and rear ends of the inner sealing plate are locked and fixed to the first angle iron on 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. This ensures that the right angles (i.e., the right angle 20 between the inner surface of the left end and the front and rear ends, and the right angle 20 between the inner surface of the right end and the front and rear ends) of the air-raid shelter door frame wall after the concrete is poured are well guaranteed. At the same time, it ensures that the flatness of the end faces 19 where the front and rear ends of the pre-embedded sleeve are located is good, avoiding the impact on the normal installation of the air-raid shelter door frame.

[0040] In this embodiment, the vertical template 11, the horizontal template 12, and the inner sealing plate 13 are all steel plates.

[0041] 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).

[0042] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this utility model to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0043] 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.

[0044] 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 fixing structure for a pre-embedded sleeve in a civil defense door frame, comprising a civil defense door frame wall casting template and a pre-embedded sleeve, wherein the civil defense door frame wall casting template includes a front template and a rear template, and the pre-embedded sleeve is longitudinally arranged between the front template and the rear template, characterized in that: Both the front and rear templates are provided with positioning cylinders corresponding to the positions of the pre-embedded sleeves. The positioning cylinders on the front and rear templates extend into the front and rear ports of the pre-embedded sleeves, respectively. A connector is axially inserted into the pre-embedded sleeve. The front and rear ends of the connector pass through the positioning cylinders on the same side and are locked and fixed to the positioning cylinders on the same side by fasteners.

2. The pre-embedded sleeve fixing structure for a civil defense door frame according to claim 1, characterized in that: The end of the positioning cylinder that extends into the pre-embedded sleeve is truncated cone-shaped.

3. The pre-embedded sleeve fixing structure for a civil defense door frame according to claim 1, characterized in that: Both the front and rear templates are provided with longitudinal through holes corresponding to the positions of the pre-embedded sleeves, and the positioning cylinder is fixedly inserted through the longitudinal through holes.

4. The pre-embedded sleeve fixing structure for a civil defense door frame according to claim 1, characterized in that: The connector is a longitudinally arranged connecting screw; the fastener is screwed to the connecting screw.

5. The pre-embedded sleeve fixing structure for a civil defense door frame according to claim 4, characterized in that: The fastener includes a locking washer and a locking nut. The locking washer contacts the end face of the positioning cylinder away from the pre-embedded sleeve. A clearance hole is provided in the middle of the locking washer to facilitate the passage of the connecting screw. The locking nut is screwed to the connecting screw and abuts against the end face of the locking washer away from the positioning cylinder.

6. The pre-embedded sleeve fixing structure for a civil defense door frame according to claim 1, characterized in that: The front and rear ends of the pre-embedded sleeve are fixed with annular end flanges, and the end flanges at the front and rear ends of the pre-embedded sleeve are respectively attached to the front template and the rear template.

7. The pre-embedded sleeve fixing structure for a civil defense door frame according to claim 6, characterized in that: A circular intermediate flange is fixed to the outer surface of the middle part of the pre-embedded sleeve.

8. The pre-embedded sleeve fixing structure for a civil defense door frame according to claim 1, characterized in that: Both the front template and the rear template include a pair of vertical templates distributed on the left and right. A horizontal template is provided between the tops of the pair of vertical templates. An inner sealing plate is provided between the inner ends of the vertical templates on the same side of the front template and the rear template. The inner sealing plate is arranged longitudinally and is distributed perpendicular to the vertical template.

9. The pre-embedded sleeve fixing structure for a civil defense door frame according to claim 8, characterized in that: The front face of the vertical template of the front template and the rear face of the vertical template of the rear template are both provided with a pair of first angle irons distributed on the left and right. The horizontal edge of the first angle iron is fixedly connected to the vertical template, and the longitudinal edge of the first angle iron located on the inner end of the vertical template is in contact with the side of the vertical template. The outer sides of the front and rear ends of the inner sealing plate are in contact with the longitudinal edge of the first angle iron located on the same side. The inner side of the inner sealing plate is provided with a pair of second angle irons symmetrically distributed on the left and right. 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 locked and fixed by connecting bolts and nuts.

10. The pre-embedded sleeve fixing structure for a civil defense door frame according to claim 8, characterized in that: The vertical template, horizontal template, and inner sealing plate are all made of steel plate.

Images