Standardized modular civil air defense door frame wall prefabricated assembly structure

Abstract

The utility model relates to the field of civil air defence door frame wall, disclose a kind of standardization modular civil air defence door frame wall prefabricated assembly structure, including civil air defence door frame wall concrete component, the steel framework and the tensioning screw sleeve pipe of standardization design are embedded in the inside of civil air defence door frame wall concrete component, the periphery of civil air defence door frame wall concrete component is provided with the concave-convex tenon structure joint for being connected with cast-in-place concrete structure, the joint interface of civil air defence door frame wall concrete component and cast-in-place structure is embedded with the post-grouting pipe for guaranteeing the joint tightness. In the utility model, factory standardization prefabrication mode is used, tensioning screw sleeve pipe and steel framework are accurately fixed by special positioning mold, the problem of insufficient positioning accuracy of on-site construction is completely solved, component size, reinforcement and the like are modularized designed according to the general technical standard of people's air defense protection equipment (protective door category), directly hoisted and installed on site, and construction process is greatly simplified.

Description

Technical Field

[0001] This utility model relates to the field of civil defense door frame walls, and in particular to a standardized modular prefabricated assembly structure for civil defense door frame walls. Background Technology

[0002] Door frame walls are core protective components of civil defense projects, directly affecting the installation accuracy and protective effectiveness of civil defense doors. Their quality is crucial to the project's ability to withstand shock waves, toxic agents, and radioactive dust. With the implementation of the "General Technical Standard for Civil Air Defense Protective Equipment (Protective Doors)," the dimensions and reserved interfaces of civil defense doors have been standardized, providing an important prerequisite for the standardization and modularization of door frame walls, which is of key significance for improving the quality and efficiency of civil defense project construction.

[0003] In existing technologies, door frame walls are mostly constructed using on-site casting. During construction, steel reinforcement must be tied on-site according to general technical standards, and tie rod sleeves must be precisely pre-embedded. The reinforcement arrangement must avoid the sleeves and flanges before concrete pouring. The entire process relies on on-site manual operation and positioning, and must strictly comply with relevant civil defense engineering specifications. However, during on-site tying of reinforcing bars and pre-embedded sleeves, the positioning error of the sleeves is relatively large due to the limitations of the construction environment and the precision of manual operation. It is difficult to ensure accurate matching with the installation interface of the air-raid shelter door. This not only increases the construction difficulty and reduces the construction efficiency, but also directly affects the stress performance of the door frame wall structure and the subsequent installation quality of the air-raid shelter door. It cannot meet the stringent requirements of the project for construction precision and quality. Therefore, a standardized and modular prefabricated assembly structure for air-raid shelter door frame walls is proposed to solve the above problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a standardized and modular prefabricated assembly structure for civil defense door frames, which aims to solve the problems of limitations imposed by the construction environment and the precision of manual operation in the existing technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a standardized modular prefabricated assembly structure for civil defense door frame walls, including door frame wall concrete components, wherein a standardized steel reinforcement skeleton and tie rod sleeves are pre-embedded inside the door frame wall concrete components, and a tongue and groove tenon joint for connecting with the cast-in-place concrete structure is provided around the door frame wall concrete components, and a post-installed grouting pipe for ensuring the airtightness of the joint is pre-embedded at the interface between the door frame wall concrete components and the cast-in-place structure.

[0006] As a further description of the above technical solution: the outer wall of the tie rod sleeve is provided with a flange, and the tie rod sleeve is fixedly connected to the steel reinforcement frame through the flange.

[0007] As a further description of the above technical solution: the tenon joint includes a groove formed around the concrete component of the door frame wall, the groove having a depth of 30-50mm and a width of 50-80mm.

[0008] As a further description of the above technical solution: the post-installed grouting pipe is pre-embedded in the joint surface of the component and is evenly arranged along the joint surface with a spacing of no more than 500mm.

[0009] As a further description of the above technical solution: the hoisting point of the concrete component of the door frame wall is provided with a hoisting hole, the inner wall of the hoisting hole is provided with anti-slip texture, and the steel reinforcement skeleton around the hoisting hole is densified.

[0010] As a further description of the above technical solution: the door frame wall concrete component is made of cast concrete, and crack-resistant fibers are added to the concrete.

[0011] As a further description of the above technical solution: the longitudinal and transverse reinforcing bars of the steel reinforcement cage are fixed by welding, and protective layer pads are provided at the edge of the steel reinforcement cage.

[0012] This utility model has the following beneficial effects: 1. In this utility model, a standardized prefabrication mode is adopted in the factory. The tie rod sleeve and the steel reinforcement skeleton are precisely fixed by a special positioning mold, which completely solves the problem of insufficient positioning accuracy during on-site construction. The component size, reinforcement and other aspects are modularly designed according to the "General Technical Standard for Civil Air Defense Protection Equipment (Protective Doors)". The components are directly hoisted and installed on site, which greatly simplifies the construction process, reduces the impact of labor and environment on construction quality, takes into account economy and efficiency, and ensures that the quality of the door frame wall is stable and controllable.

[0013] 2. In this utility model, by using the combination design of the tongue and groove joint structure and the post-installed grouting pipe, the integrity and shear resistance of the precast and cast-in-place structures are improved by the shear key, and the gaps in the joints are filled by pressure grouting to ensure that the construction joints are tight and sealed. The dual structure design perfectly meets the protection requirements of civil defense projects, effectively resists the invasion of shock waves, toxic agents and other attacks, and significantly improves the safety and protection reliability of the door frame wall structure. Attached Figure Description

[0014] Figure 1 This is a front structural diagram of a standardized and modular prefabricated assembly structure for civil defense door frame walls proposed in this utility model; Figure 2 This utility model proposes a standardized and modular prefabricated assembly structure for civil defense door frames and walls. Figure 1 A schematic diagram of the cross-sectional structure in the middle; Figure 3This utility model provides a schematic diagram showing the connection between prefabricated components and cast-in-place structures in a standardized and modular prefabricated assembly structure for civil defense door frames and walls. Figure 4 This utility model proposes a standardized and modular prefabricated assembly structure for civil defense door frames and walls. Figure 3 Cross-sectional structural diagram; Figure 5 This is a schematic diagram of the post-installed grouting pipe joint of a standardized and modular prefabricated assembly structure for civil defense door frame walls proposed in this utility model.

[0015] Legend: 1. Concrete components for door frame walls; 2. Reinforcing steel skeleton; 3. Tie rod sleeve; 4. Tongue and groove joint; 5. Post-installed grouting pipe; 6. Lifting hole. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Reference Figure 1 - Figure 3This utility model provides an embodiment of a standardized and modular prefabricated assembly structure for civil defense door frames, including a concrete door frame component 1. The concrete door frame component 1 has a standardized steel reinforcement skeleton 2 and tie rod sleeves 3 pre-embedded inside. The dimensions and thickness of the concrete door frame component 1, as well as the diameter and spacing of the steel reinforcement in the steel reinforcement skeleton 2, are all designed in accordance with the "General Technical Standard for Civil Air Defense Protective Equipment (Protective Doors)," taking into account the type of the engineering entrance, the standard model of the civil defense door, and the civil defense load level. This results in a limited number of directly selectable standard models. The periphery of the concrete door frame component 1 is designed with... The door frame wall concrete component 1 is equipped with a tongue-and-groove joint 4 for connection with the cast-in-place concrete structure. A post-installed grouting pipe 5 is pre-embedded at the interface between the concrete component 1 and the cast-in-place structure to ensure joint sealing. The outer wall of the tie rod sleeve 3 is provided with flanges. During factory prefabrication, it is precisely fixed to the reinforcing steel frame 2 using a special positioning mold, with a positioning error not exceeding 3mm. Its position and dimensions completely match the protective door installation interface specified in the general technical standards for civil defense, ensuring the installation accuracy of the protective door. The tongue-and-groove joint 4 includes a groove formed around the concrete component 1 of the door frame wall, with a groove depth of 30-50mm and a width of 5mm. 0-80mm, during the casting of concrete, the concrete flows into the groove to form shear keys, significantly improving the shear performance and structural integrity of the precast components and the cast-in-place parts. The post-installed grouting pipe 5 is made of steel pipe, pre-embedded in the joint surface of the component and evenly distributed along the joint surface with a spacing of no more than 500mm. After the component is installed in place, micro-expansion cement grout or epoxy resin grout is injected into the grouting pipe. The grouting pressure is controlled at 0.3-0.5MPa to ensure the compactness and airtightness of the construction joint, meeting the airtightness requirements of civil defense projects. The hoisting point of the door frame wall concrete component 1 uses the reserved hole of the tie rod sleeve 3 as the hoisting hole. 6. The inner wall of the hoisting hole 6 is provided with anti-slip texture, and the steel reinforcement skeleton 2 around the hoisting hole 6 is densified. The diameter of the densified steel reinforcement is the same as that of the original steel reinforcement skeleton 2, and the densification spacing is 100mm to ensure the structural safety during hoisting. The concrete component 1 of the door frame wall is poured with concrete of strength grade not lower than C35, and crack-resistant fibers are added to the concrete. The dosage of crack-resistant fibers is 0.9-1.2kg / m³ to improve the crack resistance of the component and avoid cracks caused by temperature changes or transportation vibration. The longitudinal and transverse steel reinforcements of the steel reinforcement skeleton 2 are fixed by welding, and protective layer pads are set at the edge of the steel reinforcement skeleton 2.

[0018] Working principle: Steel bars are cut and tied according to the selected model to form a standardized steel reinforcement cage 2. A flanged tie rod sleeve 3 is precisely fixed to the designated position in the steel reinforcement cage 2 using a special positioning mold, ensuring the sleeve positioning error does not exceed 3mm. The assembled steel reinforcement cage 2 and sleeve are placed into the mold, and concrete of grade C35 or higher with added crack-resistant fibers is poured. After vibration and curing to the design strength, the mold is removed, forming the door frame wall concrete component 1. The pre-embedded sleeves at the corners of the component serve as lifting holes 6. A crane is used to smoothly lift the precast component and transport it to the designated installation position on the construction site. Anti-slip textures on the inner wall of the lifting hole 6 and surrounding reinforced steel bars ensure lifting safety. After the precast component is precisely positioned, the elevation and verticality are adjusted. Adjustable diagonal braces are used for temporary fixation to ensure the stability of the component during subsequent construction. The tongue and groove joints 4 around the component are combined with the cast-in-place concrete. The cast-in-place concrete flows into the groove to form shear keys. The mechanical interlocking improves the shear resistance and structural integrity of the precast and cast-in-place parts. After the surrounding cast-in-place concrete reaches the design strength, micro-expansion cement grout or epoxy resin grout is injected at a pressure of 0.3-0.5MPa through the post-installed grouting pipe 5 embedded in the joint surface of the component. The grout fills the joint gaps to ensure that the construction joint is tight and sealed, meeting the requirements of civil defense protection. The elastic rubber protective caps at both ends of the tie rod sleeve 3 are removed. The installation of the tie rod and the assembly of the civil defense door are completed by utilizing the precise matching between the sleeve and the installation interface of the protective door.

[0019] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A standardized modular prefabricated assembly structure for civil defense door frame walls, comprising door frame wall concrete components (1), characterized in that: The door frame wall concrete component (1) is pre-embedded with a standardized steel reinforcement skeleton (2) and tie rod sleeve (3). The door frame wall concrete component (1) is provided with a tongue and groove joint (4) for connecting with the cast-in-place concrete structure. The door frame wall concrete component (1) and the cast-in-place structure are pre-embedded with a post-grouting pipe (5) to ensure the joint sealing.

2. The standardized modular prefabricated assembly structure for civil defense door frame walls according to claim 1, characterized in that: The outer wall of the tie rod sleeve (3) is provided with a flange, and the tie rod sleeve (3) is fixedly connected to the steel reinforcement frame (2) through the flange.

3. The standardized modular prefabricated assembly structure for civil defense door frame walls according to claim 2, characterized in that: The tenon joint (4) includes a groove formed around the concrete component (1) of the door frame wall, the groove having a depth of 30-50 mm and a width of 50-80 mm.

4. The standardized modular prefabricated assembly structure for civil defense door frame walls according to claim 3, characterized in that: The post-installed grouting pipe (5) is pre-embedded in the joint surface of the component and is evenly arranged along the joint surface with a spacing of no more than 500mm.

5. The standardized modular prefabricated assembly structure for civil defense door frame walls according to claim 4, characterized in that: The door frame wall concrete component (1) has a hoisting hole (6) at the hoisting point. The inner wall of the hoisting hole (6) is provided with anti-slip texture, and the steel reinforcement skeleton (2) around the hoisting hole (6) is densified.

6. The standardized modular prefabricated assembly structure for civil defense door frame walls according to claim 5, characterized in that: The door frame wall concrete component (1) is made of concrete, and anti-crack fibers are added to the concrete.

7. A standardized modular prefabricated assembly structure for civil defense door frame walls according to claim 6, characterized in that: The longitudinal and transverse reinforcing bars of the steel reinforcement cage (2) are fixed by welding, and protective layer pads are provided at the edge of the steel reinforcement cage (2).

Images