Secondary pouring method for reserved hole of super-thick wall and embedded pouring sleeve adopted by secondary pouring method

Abstract

The invention provides a super-thick wall reserved hole secondary pouring method and an adopted embedded pouring sleeve, the embedded pouring sleeve is embedded before primary pouring, a hole steel reinforcement framework and a reserved part of a main body steel reinforcement framework are connected and fixed before secondary pouring, and hole wall formworks are installed and reinforced on the inner side and the outer side of a reserved hole respectively; the reserved hole is sprayed with water for wetting, then concrete is poured, cement mortar is adopted for grouting, and finally fine aggregate concrete is adopted for sealing and compacting the upper end opening of the sleeve body, so that the secondary pouring hole structure is obtained, the forming appearance quality of the secondary pouring hole structure can be controlled, and the forming quality of the secondary pouring hole structure is improved. And moreover, the concrete raw material and the construction cost are saved, interlayer cracks formed after drying shrinkage of the secondary pouring hole opening structure and the primary pouring main body structure of the super-thick wall are avoided, the structural safety such as the adhesion of the primary pouring main body structure and the secondary pouring hole opening structure is enhanced, the construction time is greatly saved, and the engineering quality level is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wall casting, and in particular relates to a secondary casting method for a reserved opening in an ultra-thick wall and a pre-buried casting sleeve adopted by the method. Background Art

[0002] The construction site often uses a reserved trumpet form or any other measures to pour concrete for the secondary structure of the concrete wall. When pouring concrete, if the wall formwork is not reinforced in place, it is very easy to shift the position, resulting in leakage, misalignment, honeycombed surface and even bursting of the formwork; the concrete pads are not tied to the steel frame, the positioning is inaccurate or the frame is twisted, resulting in insufficient thickness of the steel protection layer and missing bars; in order to over-pour the top of the secondary structure, concrete will protrude from the wall to form triangular blocks of concrete, which will require additional manual chiseling and residue cleaning, and the wall will be repaired again after chiseling.

[0003] The walls in nuclear chemical or nuclear power projects are all super-thick walls. After the concrete of the secondary pouring opening is poured at one time, the interlayer cracks formed by the time difference between the primary and secondary structural concrete pouring and the shrinkage of the concrete cannot be effectively controlled, and the owner's requirements for the project entity quality cannot be met. Summary of the invention

[0004] In order to solve the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a method for secondary pouring of a reserved opening in an ultra-thick wall and a pre-buried pouring sleeve used therein.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] <Option 1>

[0007] The present invention provides a method for secondary casting of a reserved hole in an ultra-thick wall, which has the following characteristics: a pre-buried casting sleeve including a sleeve body and two sealing caps is used, the sleeve body is bent and a flange is provided at the lower end, and the method comprises the following steps:

[0008] Step S1, before construction, according to the position and size of the reserved opening in the construction drawing, mark the position and elevation of the embedded casting sleeve above the reserved opening;

[0009] Step S2, placing the casing body into the main steel frame according to the position and elevation marked in step S1, and welding the lower end and the upper end of the casing body to the main steel frame respectively;

[0010] Step S3, when the concealed engineering of the main body steel frame is accepted, the main wall formwork is installed and reinforced, the flange is fixedly connected and sealed to the part of the main wall formwork located at the reserved opening, and two sealing caps are respectively installed on the upper port and the lower port of the casing body;

[0011] Step S4, pouring concrete, and removing the main wall formwork after the concrete reaches the age, thereby obtaining a one-time pouring main structure of the ultra-thick wall;

[0012] Step S5, when the indoor equipment and facilities are introduced through the reserved hole, the joint of the reserved hole is first roughened and the debris is cleaned, and then the hole steel frame matching the reserved hole is connected and fixed with the reserved part of the main steel frame at the reserved hole;

[0013] Step S6, when the concealed engineering of the steel skeleton of the opening is accepted, the opening wall templates are installed and reinforced on the inner and outer sides of the reserved opening, and a hopper is installed at the upper end of the casing body as a secondary pouring entrance;

[0014] Step S7, through the secondary pouring entrance, first sprinkle water to moisten the reserved hole, then pour concrete, then use cement mortar for grouting, and finally use fine stone concrete to seal the upper port of the sleeve body until it is in the same plane as the outer wall surface of the primary pouring main structure; after the concrete reaches the age, remove the hole wall formwork to obtain the secondary pouring hole structure of the ultra-thick wall.

[0015] The secondary casting method for reserved openings in ultra-thick walls provided by the present invention may also have the following features: in step S2, the lower end of the sleeve body is welded to the skeleton point of the main steel skeleton located at the reserved opening, and the upper end of the sleeve body is welded to the horizontal and vertical steel bars on the outside of the main steel skeleton.

[0016] The method for secondary casting of reserved openings in ultra-thick walls provided by the present invention may also have the following feature: in step S3, the flange is fixedly connected to the main wall formwork by self-tapping screws.

[0017] The method for secondary casting of reserved openings in ultra-thick walls provided by the present invention may also have the following features: in step S5, the reserved part of the opening steel frame is connected to the main steel frame by a mechanical sleeve and is securely tied with an S-shaped foot.

[0018] The method for secondary casting of a reserved opening in an ultra-thick wall provided by the present invention may also have the following features: in step S6, a double-sided sponge adhesive is provided between the opening wall formwork and the surrounding edges of the reserved opening, and the width of the surrounding edges of the opening wall formwork exceeds the surrounding edges of the reserved opening by at least 250 mm, and the portion of the opening wall formwork that exceeds the reserved opening is sealed with plywood of the same thickness as that of the opening wall formwork.

[0019] The method for secondary casting of reserved openings in ultra-thick walls provided by the present invention may also have the following features: in step S6, the following structure is used to reinforce the opening wall formwork: keel back ribs are provided on the outer sides of the two opening wall formworks, and the two keel back ribs are connected by a plurality of three-stage water-stop tension screws.

[0020] The method for secondary pouring of reserved openings in ultra-thick walls provided by the present invention may also have the following feature: wherein, in step S7, the pouring of concrete is carried out by a layered pouring method.

[0021] <Option 2>

[0022] The present invention also provides a pre-embedded casting sleeve having the following characteristics, including: a sleeve body in a bent shape; and two sealing caps respectively arranged at the upper end and the lower end of the sleeve body, wherein the lower end of the sleeve body is also provided with a flange.

[0023] The embedded casting sleeve provided by the present invention may also have the following characteristics: wherein the sleeve body is a stainless steel round tube with a diameter of 120-150 mm, a wall thickness of 0.5-2 mm, a bending arc of 120-135°, and a flange width of 30-50 mm.

[0024] The embedded casting sleeve provided by the present invention may also have the following feature: wherein the sealing cap is a plastic sealing cap.

[0025] Compared with the prior art, the advantages of the present invention are: since the pre-embedded casting sleeve is buried before the primary casting, the reserved part of the opening steel frame and the main steel frame are connected and fixed before the secondary casting, and the opening wall formwork is respectively installed and reinforced on the inner and outer sides of the reserved opening, the reserved opening is firstly sprinkled with water to moisten it, and then concrete is poured, and then cement mortar is used for grouting, and finally the upper end of the sleeve body is sealed and compacted with fine stone concrete, thereby obtaining a secondary casting opening structure, which can not only control the visual quality of the secondary casting opening structure, but also save concrete raw materials and construction costs, avoid the formation of interlayer cracks between the secondary casting opening structure of the ultra-thick wall and the primary casting main structure due to shrinkage, solve the problem that after the concrete is cast using the secondary tongue and groove, the excess concrete of the protruding wall part needs to be chiseled out for a secondary time, enhance the structural safety such as the adhesion between the primary casting main structure and the secondary casting opening structure, greatly save construction time, and improve the project quality level. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of the construction process of the secondary pouring method for the reserved opening of the super-thick wall in an embodiment of the present invention;

[0027] Figure 2 is a schematic structural diagram of a pre-buried casting sleeve in an embodiment of the present invention; and

[0028] Figure 3 It is a schematic diagram of the connection between the sleeve body and the hopper in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.

[0030] <Example>

[0031] refer to Figures 1 to 3 The embedded casting sleeve used in the secondary casting method for the reserved opening of the ultra-thick wall provided in this embodiment includes a sleeve body 002 and two sealing caps 012.

[0032] The sleeve body 002 is a curved stainless steel round tube with a diameter of 120-150 mm, a wall thickness of 0.5-2 mm, and a bending arc of 120-135°. In this embodiment, the lower end of the sleeve body 002 is also provided with a flange (not shown in the figure), and the width of the flange is 30-50 mm.

[0033] Two sealing caps 012 are respectively arranged at the upper port and the lower port of the sleeve body 002; in this embodiment, the sealing caps 012 are plastic sealing caps.

[0034] refer to Figure 1 The method for secondary pouring of reserved openings in ultra-thick walls provided in this embodiment can be applied to ultra-thick concrete walls with a thickness greater than 400 mm in nuclear chemical projects and nuclear power projects. The method includes the following steps S1-S7.

[0035] Step S1, before construction, according to the position and size of the reserved opening 011 in the construction drawing, mark the position and elevation of the embedded casting sleeve above the reserved opening 011.

[0036] Step S2, according to the position and elevation marked in step S1, the casing body 002 is placed in the main steel frame, and the lower end and the upper end of the casing body 002 are respectively welded to the main steel frame.

[0037] Specifically, the lower end of the sleeve body 002 is welded to the skeleton point of the main steel skeleton located at the reserved opening, and the upper end of the sleeve body 002 is welded to the horizontal and vertical steel bars on the outside of the main steel skeleton.

[0038] Step S3, when the concealed project of the main steel frame is accepted, install and reinforce the main wall formwork, fix and seal the flange and the part of the main wall formwork located at the reserved opening 011, and install two sealing caps 012 on the upper and lower ports of the casing body 002 respectively.

[0039] Specifically, the flange of the sleeve body 002 is fixedly connected to the main wall formwork by self-tapping screws.

[0040] Step S4, pouring concrete, and removing the main wall formwork after the concrete reaches the age, thereby obtaining a one-time cast main structure 001 of the ultra-thick wall.

[0041] In this embodiment, after the main wall formwork is removed, the main structure 001 cast once is also subjected to watering maintenance, the verticality and flatness of the wall are tested, and the deviated parts are manually polished until they are qualified.

[0042] Step S5, when indoor equipment and facilities are introduced through the reserved hole 011, the joint of the reserved hole 011 is first roughened and cleaned of debris, and then the hole steel frame 007 matching the reserved hole 011 is connected and fixed to the reserved part of the main steel frame at the reserved hole 011.

[0043] Specifically, the opening steel frame 007 is connected to the reserved part of the main steel frame through a mechanical sleeve 006 and is securely tied with an eight-shaped foot.

[0044] Step S6, when the concealed engineering of the opening steel skeleton 007 is accepted, the opening wall formwork 008 is installed and reinforced on both sides of the reserved opening 011 to close the reserved opening 011; and a hopper 010 is installed at the upper port of the casing body 002 as a secondary pouring entrance.

[0045] Specifically, a double-sided sponge adhesive is provided between the opening wall formwork 008 and the surrounding edges of the reserved opening 011, and the width of the surrounding edges of the opening wall formwork 008 exceeds the surrounding edges of the reserved opening 011 by at least 250 mm; the portion of the opening wall formwork 008 that exceeds the reserved opening 011 is sealed with plywood 009 of the same thickness as the opening wall formwork 008, so as to facilitate uniform force on the structural surface.

[0046] In this embodiment, the following structure is used to reinforce the opening wall formwork 008: the outer sides of the two opening wall formworks 008 are provided with keel back ribs, and the keel back ribs include main keel back ribs 003 and secondary keel back ribs 004; the keel back ribs on both sides of the reserved opening 011 are connected and tightened by multiple three-stage water-stop tension screws 005, so as to meet the strength, rigidity and stability requirements of the opening wall formwork 008.

[0047] Step S7, through the secondary pouring entrance, first sprinkle water to moisten the reserved opening 011, then pour concrete, then use cement mortar for grouting, and finally use fine stone concrete to seal the upper port of the sleeve body 002 tightly until it is in the same plane with the outer wall surface of the primary pouring main structure 001; after the concrete reaches the age, remove the opening wall formwork to obtain the secondary pouring opening structure of the ultra-thick wall.

[0048] In this embodiment, a layered pouring method is adopted for pouring concrete for the reserved opening 11, specifically: when pouring the first layer of concrete, the slump of the concrete and whether there is leakage around the joint are strictly controlled; a small vibrator and a surface vibrator are combined to vibrate the inside and outside simultaneously to make them dense; after standing for a certain period of time, the next layer is poured until the pouring is completed.

[0049] In this embodiment, cement mortar of the same strength grade is used for grouting to avoid intermittent cracks caused by concrete shrinkage.

[0050] In this embodiment, fine stone concrete of a higher grade and with a smaller slump is used to seal and compact the upper port of the casing body 002.

[0051] The above-mentioned embodiments are preferred examples of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A secondary pouring method for a reserved hole in an ultra-thick wall, characterized by: A pre-buried casting sleeve including a sleeve body and two sealing caps is used. The sleeve body is bent and has a flange at the lower end. The method comprises the following steps: Step S1, before construction, according to the position and size of the reserved opening in the construction drawing, mark the position and elevation of the embedded casting sleeve above the reserved opening; Step S2, placing the sleeve body into the main steel frame according to the position and elevation marked in step S1, and welding the lower end and the upper end of the sleeve body to the main steel frame respectively; Step S3, when the concealed engineering of the main steel frame is accepted, the main wall formwork is installed and reinforced, the flange is fixedly connected and sealed to the part of the main wall formwork located at the reserved opening, and the two sealing caps are respectively installed on the upper port and the lower port of the casing body; Step S4, pouring concrete, and removing the main wall formwork after the concrete reaches the age, thereby obtaining a one-time pouring main structure of the ultra-thick wall; Step S5, when the indoor equipment and facilities are introduced through the reserved hole, the joint of the reserved hole is first roughened and the debris is cleaned, and then the hole steel frame matching the reserved hole is connected and fixed to the reserved part of the main steel frame at the reserved hole; Step S6, when the concealed engineering of the steel skeleton of the opening is accepted, the opening wall templates are respectively installed and reinforced on the inner and outer sides of the reserved opening, and a hopper is installed at the upper end of the casing body as a secondary pouring inlet; Step S7, through the secondary pouring entrance, first sprinkle water to moisten the reserved hole, then pour concrete, then use cement mortar for grouting, and finally use fine stone concrete to seal the upper port of the sleeve body until it is in the same plane as the outer wall surface of the primary pouring main structure; after the concrete reaches the age, remove the hole wall formwork to obtain the secondary pouring hole structure of the ultra-thick wall.

2. The method for secondary pouring of reserved openings in ultra-thick walls according to claim 1, characterized in that: in, In step S2, the lower end of the sleeve body is welded to the skeleton point of the main steel skeleton located at the reserved opening. The upper end of the sleeve body is welded to the horizontal steel bars and the vertical steel bars outside the main steel bar skeleton.

3. The method for secondary pouring of reserved openings in ultra-thick walls according to claim 1, characterized in that: in, In step S3, the flange is fixedly connected to the main wall formwork by self-tapping screws.

4. The method for secondary pouring of reserved openings in ultra-thick walls according to claim 1, characterized in that: in, In step S5, the opening steel bar skeleton and the reserved part of the main steel bar skeleton are connected by a mechanical sleeve and are fastened with an eight-shaped foot.

5. The method for secondary pouring of reserved openings in ultra-thick walls according to claim 1, characterized in that: in, In step S6, a double-sided sponge adhesive is provided between the opening wall template and the edges around the reserved opening, and the width of the edges around the opening wall template exceeding the edges around the reserved opening is at least 250 mm. The portion of the opening wall template that exceeds the reserved opening is sealed with plywood of the same thickness as that of the opening wall template.

6. The method for secondary pouring of reserved openings in ultra-thick walls according to claim 1, characterized in that: in, In step S6, the following structure is used to reinforce the opening wall formwork: The outer sides of the two opening wall templates are provided with keel back ribs. The two keel back ribs are connected by a plurality of three-section water-stop tension screws.

7. The method for secondary pouring of reserved openings in ultra-thick walls according to claim 1, characterized in that: in, In the step S7, the pouring of concrete is carried out by a layered pouring method.

8. A pre-buried casting casing, characterized in that: include: The sleeve body is in a bent shape; and Two sealing caps are respectively arranged at the upper port and the lower port of the sleeve body, Wherein, the lower end of the sleeve body is also provided with a flange.

9. The pre-buried casting sleeve according to claim 8, characterized in that: in, The sleeve body is a stainless steel round tube with a diameter of 120-150 mm, a wall thickness of 0.5-2 mm, and a bending arc of 120-135°. The width of the flange is 30-50 mm.

10. The pre-buried casting sleeve according to claim 8, characterized in that: in, The sealing cap is a plastic sealing cap.

Images