A construction method of a steel-concrete combined large formwork system for fair-faced concrete construction

Abstract

The present invention is a construction method of a steel-concrete composite large formwork system for plain concrete construction, including a steel-concrete composite large formwork and a preparation method and a construction method of the large formwork. The steel-concrete composite large formwork for plain concrete construction includes a steel panel, a lightweight concrete panel, fixed steel bars, a brace, and an anchor. A plurality of fixed steel bars are vertically welded in a row on the inner wall of the steel panel. The lightweight concrete panel is arranged on the inner wall of the steel panel and solidified with the fixed steel bars. The outer wall of the lightweight concrete panel is fixed by a brace and an anchor respectively. The present invention effectively reduces the mass of the formwork and reduces the cost of formwork production by using a lightweight concrete panel to replace the back rib of the full steel formwork. In addition, the lightweight concrete panel, as the main force transmission structure of the steel panel, evenly distributes the lateral pressure during concrete pouring, and fully utilizes the advantage of the large rigidity of the concrete structure, significantly improving the overall rigidity of the formwork system.

Description

Technical Field

[0001] The invention relates to the technical field of fair-faced concrete construction, and in particular to a construction method of a steel-concrete combined large formwork system for fair-faced concrete construction. Background Art

[0002] Fair-faced concrete is formed in one step, with natural texture as the finishing effect, without any other modification of concrete engineering. At present, the more mature types of decorative formwork include 50mm thick wooden formwork, all-steel decorative formwork, cast aluminum decorative formwork, stainless steel veneer formwork and other formwork systems.

[0003] The 50mm thick wooden formwork system is light in weight, easy to install and disassemble, has good construction performance, is convenient for the construction of various buildings, reduces joints, reduces plastering operations, reduces renovation period, and improves project quality and progress. However, the wooden formwork system is prone to degumming, bulging, peeling, cracking, and the board joints that are difficult to handle during reinstallation are difficult to handle. In addition, the wooden formwork cannot resist immersion in water, especially when exposed to sunlight after immersion in water, the wooden formwork is easily deformed, resulting in an uneven concrete surface.

[0004] The specifications and dimensions of the all-steel integral large formwork are determined according to the size of the wall formwork. It has high rigidity, good formwork flatness, and the formed concrete surface is flat and smooth, with consistent color and no joints, and the overall visual effect is good. However, the all-steel formwork is heavy and costly, which is not conducive to on-site construction.

[0005] Aluminum alloy formwork has high rigidity, long service life, large board surface, few joints, high precision, and smooth and clean poured concrete. Aluminum alloy building formwork system is a quick-disassembly formwork system, which can shorten the construction period and save the management cost of the contractor. However, compared with wooden formwork, it is heavier, and compared with all-steel formwork, it has poor toughness, is easy to deform, and has poor hardness. Therefore, it is necessary to study a new formwork system and corresponding construction methods. Summary of the invention

[0006] The present invention aims to solve the above-mentioned background problems and provides a construction method of a steel-concrete combined large formwork system for fair-faced concrete construction.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A large steel-concrete composite formwork for fair-faced concrete construction comprises a steel panel, a lightweight concrete panel, fixed steel bars, a brace and anchors, wherein a plurality of fixed steel bars are vertically welded in a row on the inner wall of the steel panel, the lightweight concrete panel is arranged on the inner wall of the steel panel and solidified together with the fixed steel bars, and the outer wall of the lightweight concrete panel is fixed by braces and anchors respectively.

[0009] Particularly, the guy brace comprises an oblique brace rod and an anchor block, one end of the oblique brace rod is connected to the outer side wall of the lightweight concrete panel, and the other end is connected to the anchor block, and the anchor block is fixed on the ground.

[0010] Particularly, the anchor is an L-shaped iron sheet, a pair of circular holes are arranged on both sides of the anchor, and the two sides of the anchor are respectively fixed to the bottom of the outer side wall of the lightweight concrete panel and the ground by bolts passing through the circular holes.

[0011] A method for preparing a steel-concrete composite large formwork for fair-faced concrete construction, characterized in that the steps are as follows:

[0012] S1. Preparation and installation of wooden formwork;

[0013] S2. The template is installed in place and fixed securely;

[0014] S3, determining the corresponding concrete strength grade and configuring lightweight concrete according to the lateral pressure of the plain concrete panel to be poured;

[0015] S4, steel panel preparation and placement;

[0016] S5. Weld and fix the steel bars on the outer side wall of the steel panel;

[0017] S6. Apply release agent to the inside of the wooden formwork;

[0018] S7. Evenly pour lightweight concrete;

[0019] S8. Lightweight concrete vibration and curing;

[0020] S9. After the lightweight concrete reaches the designed strength, the formwork is removed to obtain a large steel-concrete composite formwork.

[0021] In particular, the wooden formwork includes wooden panels, secondary beams, main beams, and fixing components. The wooden panels form a rectangular structure. The steel panels and the lightweight concrete panels are in contact with the inner walls of the front and rear wooden panels respectively. The secondary beams are installed vertically in parallel on the outer walls of the wooden panels. The main beams are installed horizontally in parallel on the outer walls of the secondary beams. The main beams at the right-angled side walls of two adjacent wooden panels are fixed by cross buckles, and the main beams on the wooden panels away from the steel panels are reinforced by fixing components.

[0022] In particular, the fixing assembly includes a movable steel bar, a threaded sleeve, a fastener, and a nut. The movable steel bar is temporarily connected to the fixed steel bar through the threaded sleeve. The end of the movable steel bar away from the threaded sleeve is provided with an external thread. The fastener and the nut are respectively threadedly connected to the external thread. The movable steel bar passes through the intersection of the secondary beam and the main beam and is fixed by tightening the fastener and the nut in sequence.

[0023] Particularly, the movable steel bar and the fixed steel bar are hot-rolled ribbed steel bars of the same specification, and the movable steel bar and the fixed steel bar are respectively threadedly connected to the threaded sleeve.

[0024] A construction method of a steel-concrete composite large formwork for fair-faced concrete construction, characterized in that the steps are as follows:

[0025] S10, move the large steel-concrete composite formwork to the clear water concrete pouring position and fix the formwork through the support and anchors;

[0026] S11. Apply release agent on the inner wall of the steel panel of the steel-concrete composite large formwork;

[0027] S12. Cast and vibrate the plain concrete wall structure in the closed space formed by the large steel-concrete composite formwork;

[0028] S13. Maintain the poured plain concrete wall structure. After its strength reaches the designed strength, remove the bracing and anchors, and clean the steel panels of the steel-concrete composite large formwork;

[0029] S14. Move the cleaned steel-concrete composite large formwork to the next fair-faced concrete structure to be poured, complete the formwork turnover and prepare for the pouring of the next wall.

[0030] The beneficial effects of the present invention are as follows: the present invention uses a lightweight concrete panel to replace the back rib of the full steel formwork, thereby effectively reducing the mass of the formwork and reducing the cost of making the formwork. In addition, the lightweight concrete panel serves as the main force transmission structure of the steel panel, which evenly distributes the lateral pressure during concrete pouring and fully utilizes the advantage of the high rigidity of the concrete structure, thereby significantly improving the overall rigidity of the formwork system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the steel-concrete combination large template structure of the present invention;

[0032] Figure 2 It is a schematic diagram of casting of plain concrete based on a steel-concrete composite large formwork according to the present invention;

[0033] Figure 3 It is a schematic diagram of the connection between the movable steel bar and the fixed steel bar of the present invention;

[0034] Figure 4 It is a diagram of the wooden formwork system of the present invention;

[0035] Figure 5 It is a construction flow chart of the present invention;

[0036] In the figure: 1-steel panel; 2-lightweight concrete panel; 3-fixed steel bar; 4-bracing; 41-diagonal brace; 42-anchor block; 5-anchor; 51-round hole; 6-wood panel; 7-secondary beam; 8-main beam; 9-fixed assembly; 91-movable steel bar; 92-threaded sleeve; 93-fastener; 94-nut;

[0037] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with embodiments:

[0039] like Figure 1-Figure 2 As shown, a large steel-concrete composite formwork for fair-faced concrete construction includes a steel panel 1, a lightweight concrete panel 2, fixed steel bars 3, a brace 4, and an anchor 5. A plurality of fixed steel bars 3 are vertically welded in a row on the inner wall of the steel panel 1. The lightweight concrete panel 2 is arranged on the inner wall of the steel panel 1 and solidified together with the fixed steel bars 3. The outer wall of the lightweight concrete panel 2 is fixed by the brace 4 and the anchor 5 respectively.

[0040] The guy 4 includes a diagonal brace rod 41 and an anchor block 42. One end of the diagonal brace rod 41 is connected to the outer wall of the lightweight concrete panel 2, and the other end is connected to the anchor block 42. The anchor block 42 is fixed to the ground. The anchor 5 is an L-shaped iron sheet. A pair of circular holes 51 are provided on both sides of the anchor 5. The two sides of the anchor 5 are fixed to the bottom of the outer wall of the lightweight concrete panel 2 and the ground by bolts passing through the circular holes 51.

[0041] Specifically, the steel-concrete composite large formwork has a steel panel 1 on one side and a lightweight concrete panel 2 on the other side. Compared with wooden formwork and aluminum alloy formwork, it has good rigidity and is not easy to deform. Compared with all-steel formwork, it has low overall weight and low cost, and its overall advantages are obvious. When in use, the formwork is directly used to enclose a closed cavity and fixed to the ground through a prop 4 and an anchor 5.

[0042] like Figure 3-Figure 4 As shown, a method for preparing a steel-concrete composite large formwork for plain concrete construction is characterized in that the steps are as follows:

[0043] S1. Preparation and installation of wooden formwork;

[0044] S2. The template is installed in place and fixed securely;

[0045] S3, determining the corresponding concrete strength grade and configuring lightweight concrete according to the lateral pressure of the plain concrete panel 2 to be poured;

[0046] S4, preparation and placement of steel panel 1;

[0047] S5, welding and fixing the steel bars 3 on the outer wall of the steel panel 1;

[0048] S6. Apply release agent to the inside of the wooden formwork;

[0049] S7. Evenly pour lightweight concrete;

[0050] S8. Lightweight concrete vibration and curing;

[0051] S9. After the lightweight concrete reaches the designed strength, the formwork is removed to obtain a large steel-concrete composite formwork.

[0052] The wooden formwork includes a wooden panel 6, a secondary beam 7, a main beam 8, and a fixing assembly 9. The wooden panel 6 is surrounded by a rectangular structure. The steel panel 1 and the lightweight concrete panel 2 are in contact with the inner walls of the wooden panel 6 on the front and rear sides respectively. The secondary beams 7 are vertically installed in parallel on the outer walls of the wooden panel 6. The main beams 8 are horizontally installed in parallel on the outer walls of the secondary beams 7. The main beams 8 at the right-angled side walls of two adjacent wooden panels 6 are fixed by cross buckles. The main beams 8 on the wooden panel 6 away from the steel panel 1 are reinforced by the fixing assembly 9; the fixing assembly 9 includes a movable steel bar 91, a threaded sleeve 9 2. Fasteners 93, nuts 94, the movable steel bar 91 is temporarily connected to the fixed steel bar 3 through the threaded sleeve 92, the movable steel bar 91 is provided with an external thread at one end away from the threaded sleeve 92, the fasteners 93 and the nuts 94 are respectively threadedly connected to the external thread, the movable steel bar 91 passes through the intersection of the secondary beam 7 and the main beam 8 and is fixed by tightening the fasteners 93 and the nuts 94 in sequence; the movable steel bar 91 and the fixed steel bar 3 are hot-rolled ribbed steel bars of the same specification, and the movable steel bar 91 and the fixed steel bar 3 are respectively threadedly connected to the threaded sleeve 92.

[0053] Specifically, the secondary beam 7 is composed of wooden slats and is evenly arranged along the plumb direction; the main beam 8 is composed of two identical round steel pipes adjacent to each other on the upper and lower sides; the wooden panel 6 away from the steel panel 1 is in contact with the lightweight concrete panel 2, and the secondary beam 7 is immediately behind the wooden panel 6, and the main beam 8 is immediately behind the secondary beam 7. The main beam 8 is tightened with the temporarily connected fixed steel bars 3 and movable steel bars 91 through fasteners 93 and nuts 94.

[0054] Before the lightweight concrete panel 2 forms strength, the movable steel bar 91 and the fixed steel bar 3 are temporarily connected by the threaded sleeve 92. After the lightweight concrete panel 2 reaches the demolding condition, the movable steel bar 91 and the fixed steel bar 3 are disconnected, and the fixed steel bar 3 is permanently retained inside the lightweight concrete panel 2. The movable steel bar 91 is pulled out from the threaded sleeve 92 for turnover use; the lightweight concrete selected for the lightweight concrete panel 2 adopts concrete of different grades depending on the size of the side form pressure.

[0055] A construction method of a steel-concrete composite large formwork for fair-faced concrete construction, characterized in that the steps are as follows:

[0056] S10, moving the large steel-concrete composite formwork to the clear water concrete pouring position and fixing the formwork through the prop 4 and the anchor 5;

[0057] S11, applying a release agent on the inner wall of the steel panel 1 of the steel-concrete composite large formwork;

[0058] S12. Cast and vibrate the plain concrete wall structure in the closed space formed by the large steel-concrete composite formwork;

[0059] S13, maintaining the poured plain concrete wall structure, and after its strength reaches the designed strength, removing the bracing 4 and the anchor 5, and cleaning the steel panel 1 of the steel-concrete composite large formwork;

[0060] S14. Move the cleaned steel-concrete composite large formwork to the next fair-faced concrete structure to be poured, complete the formwork turnover and prepare for the pouring of the next wall.

[0061] The present invention uses a lightweight concrete panel 2 to replace the back rib of the full steel formwork, which effectively reduces the mass of the formwork and reduces the cost of formwork production. In addition, the lightweight concrete panel 2 serves as the main force transmission structure of the steel panel 1, evenly distributes the lateral pressure during concrete pouring, and fully utilizes the advantage of the high rigidity of the concrete structure, significantly improving the overall rigidity of the formwork system.

[0062] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0064] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] The above is an exemplary description of the present invention. Obviously, the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or they are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A steel-concrete composite large formwork for fair-faced concrete construction, characterized in that: The invention comprises a steel panel (1), a lightweight concrete panel (2), a fixing steel bar (3), a brace (4), and an anchor (5), wherein a plurality of fixing steel bars (3) are vertically welded in a row on the inner wall of the steel panel (1), the lightweight concrete panel (2) is arranged on the inner wall of the steel panel (1) and solidified together with the fixing steel bars (3), and the outer wall of the lightweight concrete panel (2) is fixed by the brace (4) and the anchor (5) respectively; the brace (4) comprises an inclined brace rod (41) and an anchor block (42), one end of the inclined brace rod (41) is connected to the outer wall of the lightweight concrete panel (2), and the other end is connected to the anchor block (42), and the anchor block (42) is fixed on the ground; the anchor (5) is an L-shaped iron sheet, and a pair of circular holes (51) are arranged on both sides of the anchor (5), and the two sides of the anchor (5) are respectively fixed to the bottom of the outer wall of the lightweight concrete panel (2) and the ground by bolts passing through the circular holes (51).

2. A method for preparing a steel-concrete composite large formwork for plain concrete construction according to claim 1, characterized in that: The steps are as follows: S1. Preparation and installation of wooden formwork; S2. The template is installed in place and fixed securely; S3, determining the corresponding concrete strength grade according to the lateral pressure of the plain concrete panel (2) to be poured and configuring lightweight concrete; S4, steel panel (1) preparation and placement; S5, welding and fixing the steel bars (3) on the outer wall of the steel panel (1); S6. Apply release agent to the inside of the wooden formwork; S7. Evenly pour lightweight concrete; S8. Lightweight concrete vibration and curing; S9. After the lightweight concrete reaches the designed strength, the formwork is removed to obtain a large steel-concrete composite formwork.

3. The method for preparing a steel-concrete composite large formwork for plain concrete construction according to claim 2, characterized in that: The wooden formwork comprises a wooden panel (6), a secondary beam (7), a main beam (8), and a fixing assembly (9); the wooden panel (6) forms a rectangular structure; the steel panel (1) and the lightweight concrete panel (2) are in contact with the inner side walls of the wooden panel (6) on the front and rear sides respectively; the secondary beams (7) are vertically installed in parallel on the outer side walls of the wooden panel (6); the main beams (8) are horizontally installed in parallel on the outer side walls of the secondary beams (7); the main beams (8) at the right-angled side walls of two adjacent wooden panels (6) are fixed by cross buckles; and the main beams (8) on the wooden panel (6) away from the steel panel (1) are reinforced by the fixing assembly (9).

4. The method for preparing a steel-concrete composite large formwork for plain concrete construction according to claim 3, characterized in that: The fixing assembly (9) comprises a movable steel bar (91), a threaded sleeve (92), a fastener (93), and a nut (94). The movable steel bar (91) is temporarily connected to the fixed steel bar (3) through the threaded sleeve (92). An end of the movable steel bar (91) away from the threaded sleeve (92) is provided with an external thread. The fastener (93) and the nut (94) are respectively threadedly connected to the external thread. The movable steel bar (91) passes through the intersection of the secondary beam (7) and the main beam (8) and is fixed by screwing the fastener (93) and the nut (94) in sequence.

5. The method for preparing a large steel-concrete composite formwork for plain concrete construction according to claim 4, characterized in that: The movable steel bar (91) and the fixed steel bar (3) are hot-rolled ribbed steel bars of the same specification. The movable steel bar (91) and the fixed steel bar (3) are respectively threadedly connected to the threaded sleeve (92).

6. A construction method for a steel-concrete composite large formwork for plain concrete construction according to claim 1, characterized in that: The steps are as follows: S10, moving the large steel-concrete composite formwork to the clear water concrete pouring position and fixing the formwork by using a prop (4) and an anchor (5); S11, applying a release agent on the inner wall of the steel panel (1) of the large steel-concrete composite formwork; S12. Cast and vibrate the plain concrete wall structure in the closed space formed by the large steel-concrete composite formwork; S13, maintaining the poured plain concrete wall structure, and after its strength reaches the designed strength, removing the bracing (4) and anchoring pieces (5), and cleaning the steel panel (1) of the steel-concrete composite large formwork; S14. Move the cleaned steel-concrete composite large formwork to the next fair-faced concrete structure to be poured, complete the formwork turnover and prepare for the pouring of the next wall.

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