Construction method for fixing embedded sleeve of civil air defense door frame wall

Abstract

The invention relates to the technical field of building construction, aims to solve the problems that in the prior art, when an embedded sleeve is installed in a civil air defense door frame wall, positioning is difficult, and the installation precision is low, and provides a construction method for fixing the embedded sleeve of the civil air defense door frame wall. S2, surveying and setting out; s3, the end die and the bottom die are installed; s4, rechecking is carried out; s5, reinforcing steel bars are bound, and pre-embedded sleeves are installed; s6, side formworks and connecting angle aluminum are installed; s7, wood formworks are installed; by arranging the positioning base plate, the embedded sleeve can be synchronously placed when reinforcing steel bars are bound, the installation accuracy of the embedded sleeve is guaranteed, and the installation accuracy and the forming quality of the embedded sleeve can be guaranteed by positioning the sleeve. The method is rapid in construction, stable in quality and high in one-time construction qualification rate, and the construction accuracy of the civil air defense door frame wall embedded sleeve can be really ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a construction method for fixing a pre-buried sleeve pipe of a civil defense door frame wall. BACKGROUND

[0002] According to the current technical standards of civil defense doors, the installation method of civil defense doors is adjusted as follows: a galvanized steel pipe is pre-buried in the civil defense door frame wall during the early stage of the main structure construction, and then the civil defense door frame and door leaf are installed. The core function of the pre-buried galvanized steel pipe is to provide a precise and firm "anchoring connection point" for the subsequent installation of the civil defense door frame. The standard requires that the position deviation of the pre-buried galvanized steel pipe of the civil defense door be less than or equal to 3 mm.

[0003] During construction, the steel bars of the civil defense door frame wall need to be bound first, and then the pre-buried sleeve pipe (i.e. the galvanized steel pipe) is installed. The height of the pre-buried sleeve pipe during installation is not easy to control, and the installation position of the pre-buried sleeve pipe is prone to conflict with the horizontal bars or stirrups of the civil defense door frame wall. Therefore, the horizontal bars or stirrups often need to be reworked before the pre-buried sleeve pipe can be inserted into the steel reinforcement framework of the civil defense door frame wall.

[0004] In addition, since the pre-buried sleeve pipe is cylindrical, it is prone to roll left and right after being placed in the steel reinforcement framework. Conventionally, short steel bars are welded to the horizontal or vertical steel bars of the civil defense door frame wall to hold the pre-buried sleeve pipe, but the precision of the pre-buried sleeve pipe still does not meet the requirements, and the welding of the short positioning bars also damages the steel bars of the civil defense door frame wall. After the structure is poured with concrete, the pre-buried sleeve pipes are often not on the same vertical line, and the horizontal spacing deviation of the sleeve pipes is large, which seriously affects the installation of the civil defense door frame and door leaf in the later stage. SUMMARY

[0005] The present application aims to provide a construction method for fixing a pre-buried sleeve pipe of a civil defense door frame wall, to solve the problem of difficult positioning and low installation precision when installing a pre-buried sleeve pipe in a civil defense door frame wall in the prior art.

[0006] The present application is implemented by using the following technical solutions: The present application provides a construction method for fixing a pre-buried sleeve pipe of a civil defense door frame wall, comprising the following steps: S1: construction preparation; The civil defense door frame wall formwork comprises end forms, bottom forms and side forms, and the three groups of side forms are arranged in a door shape as a whole, wherein two groups of side forms are arranged oppositely, and the other group of side forms is connected between the upper parts of the two groups of side forms, and the three groups of side forms form a door shape; Each group of side forms comprises two oppositely arranged side forms; One end of each group of side forms is fixedly connected with an end form, which closes one end of each group of side forms; the bottom of the other group of side forms is fixedly connected with a bottom form, which closes the bottom of the other group of side forms; The wooden formwork further comprises a wood formwork; According to the position of the embedded sleeve of the civil defense door frame wall, a positioning sleeve hole is formed on the side form, and a positioning sleeve is installed at the positioning sleeve hole, and the positioning sleeve protrudes from the inner side of the side form; Positioning pads are arranged on the end form and the bottom form, and the center positions of the positioning pads match the center positions of the embedded sleeves; S2: measuring and laying out; S3: installing the end form and the bottom form; S4: rechecking; S5: binding the steel bars and installing the embedded sleeves; The steel bars of the civil defense door frame wall are bound, and at the same time, the embedded sleeves are synchronously installed according to the positions of the positioning pads on the end form and the bottom form, so that the positions of the embedded sleeves correspond to the positions of the corresponding positioning pads; S6: installing the side form and connecting the corner aluminum; When the side form is installed, the positioning sleeve is inserted into the corresponding embedded sleeve; S7: installing the wood formwork.

[0007] The embedded sleeve construction can realize convenient and fast positioning and construction, the positioning pads can be used to synchronously place the embedded sleeves when the steel bars are bound, the installation accuracy of the embedded sleeves is ensured, the positioning sleeves can ensure the installation accuracy and forming quality of the embedded sleeves, the method is fast in construction, stable in quality, high in one-time construction qualified rate, and can truly ensure the construction accuracy of the embedded sleeves of the civil defense door frame wall.

[0008] As a preferred technical solution: Step S1 further comprises: deepening the civil defense door frame wall formwork according to design drawings and specification requirements.

[0009] As a preferred technical solution: Step S1 further comprises: providing a lower support corner aluminum, a counter support corner aluminum, a internal corner aluminum form, a corner aluminum for reinforcing a joint of an aluminum wood formwork, a counter pull screw rod and an aluminum form support.

[0010] As a preferred technical solution: Step S2 specifically comprises: according to the requirements of the drawings, the edge line and the control line of the civil defense door frame wall are laid out on the cast concrete plate surface by using a black line.

[0011] As a preferred technical solution: Step S3 specifically comprises: The lower support corner aluminum is fixedly installed at the lower end of the end form, and the internal corner aluminum form is fixedly installed at the upper end of the end form, two end forms provided with the lower support corner aluminum and the internal corner aluminum form are first arranged, and the two end forms are arranged opposite to each other; Then, the bottom form is arranged between the upper parts of the two end forms, and the bottom form is fixedly connected with the internal corner aluminum forms on both sides. The horizontal supporting aluminum angle is connected between the two end molds to reinforce; the aluminum mold support is installed below the bottom mold to support and reinforce the bottom of the bottom mold.

[0012] As a preferred technical solution: The step S4 specifically comprises: The horizontality and verticality of the end mold and the bottom mold are checked, and the height of the positioning base plate on the end mold is checked, and after ensuring no error, the next process is carried out.

[0013] As a preferred technical solution: The end of the embedded sleeve is welded with a locking head position reinforcing plate, and the outer part of the pipe body of the embedded sleeve is welded with a sealing rib.

[0014] As a preferred technical solution: The step S6 further comprises: connecting the side mold with the end mold and the bottom mold through the connecting aluminum angle to realize the reinforcement of the structure.

[0015] As a preferred technical solution: The construction method further comprises S8: installing aluminum wood mold plate joint reinforcing aluminum angle; The end mold, the bottom mold and the side mold adopt aluminum mold, and the aluminum wood mold plate joint reinforcing aluminum angle is used for reinforcing and sealing treatment at the joint of the wood mold plate and the aluminum mold to prevent the joint from being out of alignment and leaking.

[0016] As a preferred technical solution: The construction method further comprises S9: reinforcing the mold plate; The counter-pulling screw rod is installed between the two oppositely arranged side molds to reinforce the side mold, and the counter-pulling screw rod passes through the positioning sleeve hole on the side mold to pull; the back rabbet is installed on the outside of the side mold to reinforce it; S10: adjusting the verticality and flatness of the mold plate; The verticality and flatness of each mold plate are rechecked, and if they do not meet the requirements, they are adjusted; S11: pouring concrete; After passing the acceptance, the concrete is poured in the air defense door frame wall mold plate; S12: curing the concrete.

[0017] As described above, due to the adoption of the above technical solution, the beneficial effects of the present application are: Since the specification has unified the position and quantity of the pre-buried sleeve of the civil air defense door frame wall on the standard, the aluminum mold is matched to realize customization and batch production, and the turnover use on different projects can be realized, so that the cost is effectively reduced. Meanwhile, by setting the positioning base plate on the end mold and the bottom mold of the aluminum mold, the pre-buried sleeve can be installed synchronously in the stage of binding the steel bars, and the reference effect of the positioning base plate can effectively solve the problem of inaccurate positioning of the pre-buried sleeve. Meanwhile, by setting the positioning sleeve on the side mold of the aluminum mold, the positioning sleeve can be inserted into the pre-buried sleeve, so that the positioning accuracy of the pre-buried sleeve is further ensured, and the deviation is not easy to occur when pouring the concrete. The hole formed by the positioning sleeve on the aluminum mold and the pre-buried sleeve can also be used for the aluminum mold reinforcement by using the tensioning screw rod. By using the aluminum angle for the joint reinforcement of the aluminum-wood formwork, the construction quality of the joint can be ensured, and the wrong table and the leakage of the slurry can be prevented. By using the above construction method, the problems of low construction precision, instability and difficult positioning of the pre-buried sleeve of the civil air defense door frame wall can be effectively solved, and the accurate and efficient installation and construction of the pre-buried sleeve are realized. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The flow chart of the construction method for fixing the pre-buried sleeve of the civil air defense door frame wall.

[0019] Figure 2 The schematic diagram of the pre-buried sleeve reinforcement of the civil air defense door frame wall.

[0020] Figure 3 The Figure 2 sectional view in the A-A direction.

[0021] Figure 4 The Figure 2 sectional view in the B-B direction.

[0022] Figure 5 The structural schematic diagram of the pre-buried sleeve of the civil air defense door frame wall.

[0023] Figure 6 The installation schematic diagram of the positioning base plate.

[0024] Figure 7 The installation schematic diagram of the positioning sleeve.

[0025] Figure: 1-side mold, 2-end mold, 3-connection angle aluminum, 4-lower support angle aluminum, 5-pair of support angle aluminum, 6-shade aluminum mold, 7-aluminum-wood formwork joint reinforcement angle aluminum, 8-pre-buried sleeve, 801-locking head position reinforcing plate, 802-tight rib, 9-wood formwork, 10-aluminum mold support, 11-positioning sleeve hole, 12-steel bar, 13-bottom mold, 14-positioning sleeve, 15-positioning base plate. DETAILED DESCRIPTION

[0026] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0027] Embodiment 1 As shown in the drawings, the present embodiment proposes a construction method for fixing a civil air defense door frame wall embedded sleeve, comprising the following steps: Figures 1-7 S1: construction preparation; According to the design drawing and specification requirements, the civil air defense door frame wall formwork is deepened; The civil air defense door frame wall formwork comprises an end form 2, a bottom form 13 and a side form 1. The three groups of side forms 1 are arranged in a door shape, wherein two groups of side forms 1 are oppositely arranged, and the other group of side forms 1 is connected between the upper parts of the two groups of side forms 1, and the three groups of side forms 1 form a door shape. Each group of side forms 1 comprises two oppositely arranged side forms 1.

[0028] One end of each group of side forms 1 is fixedly connected with an end form 2, and the end form 2 closes one end of each group of side forms 1; the bottom of the other group of side forms 1 is fixedly connected with a bottom form 13, and the bottom form 13 closes the bottom of the other group of side forms 1. Preferably, the end form 2, the bottom form 13 and the side form 1 are made of aluminum formwork.

[0029] Preferably, the civil air defense door frame wall formwork further comprises a wooden formwork 9, the other end of each group of side forms 1 is fixedly connected with the wooden formwork 9, the upper part of the other group of side forms 1 is fixedly connected with the wooden formwork 9, and the wooden formwork 9 and the aluminum formwork together form the civil air defense door frame wall formwork.

[0030] Preferably, the thickness of the aluminum formwork is 6mm, the rib height is 65mm, and the rib spacing is 50mm.

[0031] Preferably, a φ16.5mm round hole is formed on the aluminum formwork for the pin to pass through to fix the aluminum formwork, the round hole is formed on the flange of the aluminum formwork, and the center of the round hole is 40mm away from the formwork surface.

[0032] According to the position of the civil air defense door frame wall embedded sleeve 8, a positioning sleeve hole 11 is formed on the side form 1, and a positioning sleeve 14 is welded at the positioning sleeve hole 11, the positioning sleeve 14 protrudes from the inner side of the side form 1, and the outer diameter of the positioning sleeve 14 is slightly smaller than the inner diameter of the embedded sleeve 8.

[0033] Preferably, the thickness of the aluminum formwork is 6mm, the rib height is 65mm, and the rib spacing is 50mm.

[0034] Preferably, the positioning sleeve 14 protrudes 30mm inside the side surface of the side mold 1, the weld height is 3mm, and the outer diameter of the positioning sleeve 14 is 39mm (smaller than the inner diameter of the embedded sleeve 8), and the wall thickness is 3mm.

[0035] The positioning pad plate 15 is welded on the end mold 2 and the bottom mold 13, and the center position of the positioning pad plate 15 matches the center position of the embedded sleeve 8, which means that the center positions of the two correspond to each other and are on a straight line. The positioning pad plate 15 is used to provide a reference for the installation position of the embedded sleeve 8.

[0036] Preferably, the thickness of the positioning pad plate 15 is 3mm, it is circular, the diameter is 48mm (the diameter is the same as the outer diameter of the embedded sleeve 8 of the civil air defense door frame wall), and the weld height is 3mm.

[0037] It is equipped with a lower support aluminum angle 4, a counter support aluminum angle 5, a female corner aluminum mold 6, an aluminum angle 7 for reinforcing the joint of an aluminum wood formwork plate, a pull rod, an aluminum mold support 10, and other components.

[0038] S2: Measure the line; According to the requirements of the drawings, the edge line and the 200mm control line of the civil air defense door frame wall are drawn on the poured concrete slab surface using ink lines.

[0039] S3: Install the end mold 2 and the bottom mold 13; The lower support aluminum angle 4 is fixedly installed at the lower end of the end mold 2, and the female corner aluminum mold 6 is fixedly installed at the upper end of the end mold 2. First, two end molds 2 are erected, each of which is installed with a lower support aluminum angle 4 and a female corner aluminum mold 6, and the two end molds 2 are arranged opposite to each other. Then, the bottom mold 13 is arranged between the upper parts of the two end molds 2, and the bottom mold 13 is fixedly connected with the female corner aluminum molds 6 on both sides. The connection between the bottom mold 13 and the female corner aluminum molds 6 can be achieved through pins and pin plates. To avoid deformation of the assembled formwork, a horizontal counter support aluminum angle 5 is connected between the two end molds 2 for reinforcement, ensuring the size of the hole opening formwork. Preferably, the components are connected through aluminum mold matched pins and pin plates. The thickness of the lower support aluminum angle 4 and the counter support aluminum angle 5 is 6mm, and the width of the aluminum angle is determined according to the rib height of the aluminum mold and the thickness of the construction method. The aluminum mold support 10 is installed below the bottom mold 13. The aluminum mold support 10 is a vertical support rod with adjustable height, which supports and reinforces the bottom of the bottom mold 13. The spacing and number of the aluminum mold supports 10 need to meet the temporary bearing requirements during concrete pouring and need to be determined through calculation.

[0040] S4: Recheck; The levelness and perpendicularity of the end mold 2 and the bottom mold 13 are checked using instruments, and the height of the positioning pad plate 15 on the end mold 2 is checked. After ensuring that there is no error, the next process is carried out.

[0041] S5: Binding steel bars 12 and installing embedded sleeves 8; The vertical and horizontal steel bars of the civil defense door frame wall are bound, and at the same time, the embedded sleeves 8 are installed synchronously according to the positions of the positioning pads 15 on the end mold 2 and the bottom mold 13, so that the positions of the embedded sleeves 8 correspond to the positions of the corresponding positioning pads 15. Preferably, the end of the embedded sleeve 8 is welded with a locking head position reinforcing plate 801, and the outer part of the pipe body of the embedded sleeve 8 is welded with a sealing rib 802; the embedded sleeve 8 is made of a galvanized steel pipe with a diameter of φ48*3.5mm, the height of the locking head position reinforcing plate 801 and the sealing rib 802 is ≥50mm, the thickness is ≥5mm, and the height of the welding seam is 3mm.

[0042] S6: Installing side molds 1 and connecting angle aluminum 3; A group of side molds 1 are installed on one side of the end mold 2 and above the bottom mold 13, respectively, since the inner side of the side mold 1 is provided with a positioning sleeve 14, when installing, the positioning sleeve 14 is inserted into the corresponding embedded sleeve 8, so that the embedded sleeve 8 is fixed firmly; The side mold 1 is connected with the end mold 2 and the bottom mold 13 through the connecting angle aluminum 3, and the structure is reinforced through the connecting angle aluminum 3; preferably, the connecting angle aluminum 3 is connected with the side mold 1, the end mold 2 and the bottom mold 13 through aluminum mold matched pins and pin pieces.

[0043] S7: Installing wooden molds 9; The wooden molds 9 are installed at adjacent positions of the aluminum molds (the remaining part of the civil defense door frame wall needs to be supported by the wooden molds).

[0044] S8: Installing angle aluminum 7 for reinforcing wooden mold and aluminum mold joint; The angle aluminum 7 for reinforcing wooden mold and aluminum mold joint is used for reinforcing and sealing treatment at the joint of the wooden mold 9 and the aluminum mold to prevent the joint from being out of alignment and leaking. As shown in Figure 4 The side of the angle aluminum is attached to the wooden mold 9, and the other side is attached to the flange of the side mold 1, and the aluminum mold matched pins and pin pieces are connected with the wooden mold 9 and the side mold 1, respectively. Other angle aluminum can be installed in the same way.

[0045] S9: Reinforcing the mold; The opposite side molds 1 are reinforced by installing a tensioning screw rod therebetween, and the tensioning screw rod is tensioned through the positioning sleeve hole 11 on the side mold 1; the back lath is installed on the outside of the side mold 1 to reinforce it.

[0046] S10: Adjusting the perpendicularity and flatness of the mold; The perpendicularity and flatness of each mold are rechecked, and if they do not meet the requirements, they are adjusted.

[0047] S11: Pouring concrete; After the acceptance, the concrete is poured in the template of the door frame wall.

[0048] S12: curing the concrete; After the pouring of the concrete, curing is performed according to the requirements of the specification.

[0049] The construction method of the present application realizes convenient and fast construction of the reinforcing steel 12 and the embedded sleeve 8 of the door frame wall by customizing the aluminum mold. The positioning pad 15 is installed on the end mold 2 and the bottom mold 13, which can guide the binding of the horizontal steel 12 and the hoop steel, and cooperates with the installation of the embedded sleeve 8. The problem of disassembling and modifying the steel after collision with the steel during the separate installation of the embedded sleeve 8 is avoided. The positioning pad 15 provides a reference for the installation of the embedded sleeve 8, and the embedded sleeve 8 can be positioned while the steel is being bound. This not only facilitates the installation of the embedded sleeve 8 and makes the construction fast, but also ensures the installation accuracy of the embedded sleeve 8.

[0050] The positioning sleeve 14 is provided on the side mold 1, which is inserted into the embedded sleeve 8 to fix the embedded sleeve 8 and ensure that the embedded sleeve 8 is not moved during the construction process such as pouring of the concrete after the formwork is erected. In the case of ensuring the construction efficiency, the installation accuracy of the embedded sleeve 8 of the door frame wall is ensured.

[0051] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A construction method for fixing a pre-buried sleeve of a civil defense door frame wall, characterized in that it comprises the following steps: S1: construction preparation; the civil defense door frame wall formwork comprises an end form, a bottom form and side forms, and the three groups of side forms are arranged in a door shape, wherein two groups of side forms are oppositely arranged, and the other group of side forms is connected between the upper parts of the two groups of side forms, and the three groups of side forms form a door shape; wherein each group of side forms comprises two oppositely arranged side forms; one end of each group of side forms is fixedly connected with an end form, and the end form closes one end of each group of side forms; the bottom of the other group of side forms is fixedly connected with a bottom form, and the bottom form closes the bottom of the other group of side forms; the civil defense door frame wall formwork further comprises a wooden formwork; according to the position of the pre-buried sleeve of the civil defense door frame wall, a positioning sleeve hole is formed on the side form, and a positioning sleeve is installed at the positioning sleeve hole, and the positioning sleeve protrudes from the inner side surface of the side form; positioning pads are arranged on the end form and the bottom form, and the center positions of the positioning pads match the center positions of the pre-buried sleeves; S2: measurement and line laying; S3: installation of the end form and the bottom form; S4: re-inspection; S5: binding of steel bars and installation of the pre-buried sleeves; the steel bars of the civil defense door frame wall are bound, and at the same time, the pre-buried sleeves are synchronously installed according to the positions of the positioning pads on the end form and the bottom form, so that the positions of the pre-buried sleeves correspond to the positions of the corresponding positioning pads; S6: installation of the side forms and connecting aluminum angles; when the side forms are installed, the positioning sleeves are inserted into the corresponding pre-buried sleeves; and S7: installation of the wooden formwork.

2. The construction method for fixing the pre-buried sleeve of the civil defense door frame wall according to claim 1, characterized in that step S1 further comprises: deepening the civil defense door frame wall formwork according to design drawings and specification requirements.

3. The construction method for fixing the pre-buried sleeve of the civil defense door frame wall according to claim 1, characterized in that step S1 further comprises: providing counter-bracing aluminum angles, counter-bracing aluminum angles, internal corner aluminum forms, aluminum-wood formwork joint reinforcement aluminum angles, tensioning screws and aluminum form supports.

4. The construction method for fixing the pre-buried sleeve of the civil defense door frame wall according to claim 1, characterized in that step S2 specifically comprises: according to the requirements of the drawings, the edge lines and control lines of the civil defense door frame wall are drawn on the cast concrete slab surface using a black line.

5. The construction method for fixing the pre-buried sleeve of the civil defense door frame wall according to claim 3, characterized in that step S3 specifically comprises: the counter-bracing aluminum angles are fixedly installed at the lower ends of the end forms, and the internal corner aluminum forms are fixedly installed at the upper ends of the end forms, two end forms provided with the counter-bracing aluminum angles and the internal corner aluminum forms are first arranged, and the two end forms are oppositely arranged; then, the bottom form is arranged between the upper parts of the two end forms, and the bottom form is fixedly connected with the internal corner aluminum forms on both sides; the horizontal counter-bracing aluminum angles are connected between the two end forms for reinforcement; and the aluminum form supports are installed below the bottom form to support and reinforce the bottom of the bottom form.

6. The construction method for fixing the pre-buried sleeve of the civil defense door frame wall according to claim 1, characterized in that step S4 specifically comprises: checking the horizontal degree and vertical degree of the end form and the bottom form, and checking the height of the positioning pad on the end form, and the next process is carried out after ensuring that there is no error.

7. The construction method for fixing the pre-buried sleeve of the civil defense door frame wall according to claim 1, characterized in that ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The end of the embedded sleeve is welded with a locking head position reinforcing plate, and the pipe body of the embedded sleeve is welded with a sealing rib outside.

8. The construction method of claim 1, wherein the construction method is characterized in that: The step S6 further comprises connecting the side mold with the end mold and the bottom mold through the connecting aluminum angle, and reinforcing the structure through the connecting aluminum angle.

9. The construction method of claim 3, wherein the construction method is characterized in that: The method further comprises S8: installing the aluminum angle for reinforcing the wood formwork joint; The end mold, the bottom mold and the side mold are aluminum molds, and the aluminum angle for reinforcing the wood formwork joint is used to reinforce and seal the joint between the wood formwork and the aluminum mold to prevent the joint from being out of alignment and leaking.

10. The construction method of claim 9, wherein the construction method is characterized in that: The method further comprises S9: reinforcing the formwork; The opposite pull screw is installed between the two opposite side molds to reinforce the side molds, and the opposite pull screw passes through the positioning sleeve hole on the side mold to pull opposite sides; S10: adjusting the verticality and flatness of the formwork; The verticality and flatness of the formwork are rechecked, and the formwork is adjusted if it does not meet the requirements; S11: pouring concrete; After the acceptance, the concrete is poured in the formwork of the civil air defense door frame wall; S12: curing the concrete.

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