Steel formwork for coal retaining wall of circular coal yard

Abstract

The utility model discloses a steel formwork for a coal retaining wall of a circular coal yard, and relates to the technical field of building construction. Outer stiffening plates are evenly distributed on the periphery of the outer edge and the outer side face of the outer formwork in the transverse direction and the longitudinal direction, visible sewing lines are arranged on the periphery of the inner edge of the outer formwork, outer bolt holes are formed in the positions, corresponding to the visible sewing lines, of the upper side and the lower side of the outer formwork, and inner stiffening plates are evenly distributed on the periphery of the outer edge and the outer side face of the inner formwork in the transverse direction and the longitudinal direction. Inner bolt holes corresponding to the outer bolt holes are formed in the upper side and the lower side of the inner formwork, the outer formwork and the inner formwork are connected through a steel back ridge reinforcing lock, and split bolts are connected in a penetrating mode through the double-spliced square steel, the outer bolt holes of the outer formwork, the inner bolt holes of the inner formwork and the double-spliced square steel in sequence. And the plate surfaces of the outer template and the inner template are respectively provided with a lifting handle. The structure system is stable, practical operation is simple, assembling and disassembling are convenient, turnover use is met, the construction quality is guaranteed, the bare concrete technical standard is met, the construction efficiency is improved, the use cost is low, economic benefits are remarkable, and the application prospect is wide.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to steel formwork for retaining walls in circular coal yards. Background Technology

[0002] As one of the iconic buildings in a thermal power plant, the casting and shaping of the outer cylinder wall of the circular coal yard has gradually attracted the attention of all parties involved in the construction. The main body of the circular coal yard is a reinforced concrete structure with a circumferential strip foundation. Multiple post-cast strips are set throughout the cylinder wall. How to handle the horizontal construction joints formed by layered casting and the vertical construction joints at the post-cast strips is one of the decisive factors determining the overall appearance quality of the cylinder wall. Furthermore, due to the structural characteristics and construction technology limitations of the circular coal yard cylinder wall, the entire cylinder wall cannot be cast in one continuous pour. How to accurately handle the intersection of the open joints between successively cast sections to ensure a straight overall line structure, including the construction of the hyperboloid fair-faced concrete structure, is also a challenge in formwork design. Therefore, designing a new type of steel formwork for the retaining wall of a circular coal yard is particularly necessary. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a steel formwork for a circular coal yard retaining wall. It has a reasonable structural design, high surface rigidity, tight joints, accurate specifications and dimensions, and is easy to assemble and disassemble for repeated use. It effectively improves the forming effect of fair-faced concrete on the cylinder wall, ensures construction quality, and is easy to promote and use.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a circular coal yard retaining wall steel formwork, comprising an outer formwork, an inner formwork, double-section square steel, tie bolts, outer stiffening plates, inner stiffening plates, a lifting handle, hexagonal nuts, flat washers, and visible seam lines. The outer formwork has a ring of outer stiffening plates around its outer edge, and multiple outer stiffening plates are evenly distributed along the transverse and longitudinal directions on the outer side of the outer formwork. The inner edge of the outer formwork has a ring of visible seam lines, and multiple outer bolt holes are provided on the upper and lower sides of the outer formwork corresponding to the visible seam lines. The inner formwork has... The inner template has a ring of internal stiffening plates, with multiple internal stiffening plates evenly distributed along the transverse and longitudinal directions on its outer side. The upper and lower sides of the inner template have internal bolt holes corresponding to the external bolt holes. The outer template and the inner template are connected by a steel back rib reinforcement lock, which consists of tie bolts, hexagonal nuts, and flat washers. The tie bolts pass through the double-section square steel, the external bolt holes of the outer template, the internal bolt holes of the inner template, and the double-section square steel in sequence. The connection between the tie bolts and the double-section square steel on both sides is fixed by hexagonal nuts and flat washers threaded together. Both the outer template and the inner template are equipped with lifting handles on their surfaces.

[0005] Preferably, the visible joint lines consist of horizontal circumferential joints on the top and bottom sides and vertical joints on the left and right sides. The horizontal circumferential joints are isosceles trapezoidal visible joint construction lines with a base angle of 45°, and the vertical joints are right trapezoidal visible joint construction lines with another base angle of 45°. Visible joint construction lines are set around the inner side of the outer formwork. The lines are trapezoidal in shape, and the concave part of the concrete is made into a 45° angle and polished. At the same time, the lengths of the upper and lower sides of the vertical joints are half the lengths of the upper and lower sides of the horizontal circumferential joints, respectively. When two adjacent formwork pieces are assembled, the width and shape of the resulting lines are the same as those on the top and bottom sides of the formwork.

[0006] Preferably, the outer template has an outer seam at each of the three equal division points on its upper and lower edges, where the outer stiffening plate and the horizontal circumferential seam are disconnected; the inner template has an inner seam at each of the three equal division points on its upper and lower edges, where the inner stiffening plate is disconnected; the structure of the outer and inner seams allows the entire template to be bent at a certain angle at these points to better fit the curved surface design.

[0007] Preferably, the lifting handle is a round steel ring, and the lifting handles are located in the upper middle part of the outer template and the inner template respectively. Two lifting handles are fixed on each template, and each lifting handle is welded between two adjacent stiffening plates. The lifting handles facilitate the lifting of each template for use in the next layer.

[0008] Preferably, three external bolt holes are provided in the middle of the horizontal circumferential joints on the upper and lower sides, and three pre-drilled holes for tie bolts are provided in the middle of the lines on the upper and lower sides. This not only places the tie bolt holes in the visible joints recessed into the concrete surface, reducing their adverse impact on the overall appearance quality, but also cleverly integrates the template joints into the visible joint lines, avoiding the impact of unevenness and color difference at the joints. In addition, the external corners of the visible joint lines are beveled and ground, which not only improves the visual quality of the cast-in-place molding, but also facilitates demolding and removal, preventing damage to the concrete edges when the embedded lines are removed.

[0009] Preferably, the vertical stiffening plate of the outer template is provided with an external connecting hole for subsequent wire insertion and fixing of the horizontal waler; the vertical stiffening plate on the outer perimeter of the outer template is provided with an external hole for easy connection of the left and right adjacent templates; the vertical stiffening plate of the inner template is provided with an internal connecting hole for subsequent wire insertion and fixing of the horizontal waler; the vertical stiffening plate on the outer perimeter of the inner template is provided with an internal hole for easy connection of the left and right adjacent templates.

[0010] The beneficial effects of this utility model are: the device is simple to operate, has a stable structural system, high surface rigidity, tight joints, accurate specifications and dimensions, and is easy to assemble and disassemble to meet the needs of repeated use, ensuring construction quality, effectively improving the molding effect of fair-faced concrete on the cylinder wall, achieving the technical standards of fair-faced concrete, greatly improving construction efficiency, achieving a high rate of first-time excellent molding quality, reducing usage costs, having significant economic benefits, and broad application prospects. Attached Figure Description

[0011] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments;

[0012] Figure 1 This is a schematic diagram of the connection of the outer template of this utility model;

[0013] Figure 2 for Figure 1 A bottom view;

[0014] Figure 3 This is a schematic diagram of the connection of the inner template of this utility model;

[0015] Figure 4 This is a schematic diagram of the structure of the double-section square steel of this utility model;

[0016] Figure 5 This is a schematic diagram of the installation of the steel formwork of this utility model;

[0017] Figure 6 This is a schematic diagram of the structure of the outer template of this utility model;

[0018] Figure 7 for Figure 6 The right view;

[0019] Figure 8 for Figure 6 Top view;

[0020] Figure 9 This is a schematic diagram of the structure of the inner template of this utility model;

[0021] Figure 10 for Figure 9 The right view;

[0022] Figure 11 for Figure 9 Top view;

[0023] Figure 12 This is a schematic diagram of the horizontal circumferential seam on the outer template of this utility model;

[0024] Figure 13 This is a schematic diagram of the vertical seam on the outer template of this utility model;

[0025] Figure 14 This is a schematic diagram of the installation of the lifting handle of this utility model. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0027] Reference Figure 1-14 This specific implementation adopts the following technical solution: A circular coal yard retaining wall steel formwork includes an outer formwork 1, an inner formwork 2, double-section square steel 3, tie bolts 4, outer stiffening plates 5, inner stiffening plates 6, a lifting handle 7, hexagonal nuts 8, flat washers 9, and visible seam lines 10. An outer stiffening plate 5 is provided around the outer edge of the outer formwork 1. Multiple outer stiffening plates 5 are evenly distributed along the transverse and longitudinal directions on the outer side of the outer formwork 1. An visible seam line 10 is provided around the inner edge of the outer formwork 1. Multiple outer bolt holes 11 are provided on the upper and lower sides of the outer formwork 1 corresponding to the visible seam line 10. An inner stiffening plate 6 is provided around the outer edge of the inner formwork 2. Multiple internal stiffening plates 6 are evenly distributed along the transverse and longitudinal directions on the outer side of the inner template 2. The upper and lower sides of the inner template 2 are provided with internal bolt holes 12 corresponding to the external bolt holes 11. The outer template 1 and the inner template 2 are connected by a steel back rib reinforcement lock. The steel back rib reinforcement lock consists of tie bolts 4, hexagonal nuts 8, and flat washers 9. The tie bolts 4 pass through the double square steel 3, the external bolt holes 11 of the outer template 1, the internal bolt holes 12 of the inner template 2, and the double square steel 3 in sequence. The connection between the tie bolts 4 and the double square steel 3 on both sides is fixed by threads with hexagonal nuts 8 and flat washers 9. The outer template 1 and the inner template 2 are both equipped with lifting handles 7.

[0028] It is worth noting that the lifting handle 7 is a round steel pull ring. The lifting handle 7 is located in the upper middle part of the outer template 1 and the inner template 2 respectively. Two lifting handles 7 are fixed on each template. Each lifting handle 7 is welded between two adjacent stiffening plates. The lifting handle 7 makes it easy to lift each template into the next layer for reuse.

[0029] In addition, the outer template 1 has an outer connecting hole 15 on the vertical outer stiffening plate 5 for subsequent wire threading and fixing of the horizontal waler; the outer template 1 has an outer hole 16 on the outer side of the vertical outer stiffening plate 5 to facilitate the fixed connection of the left and right adjacent templates; the inner template 2 has an inner connecting hole 17 on the vertical inner stiffening plate 6 for subsequent wire threading and fixing of the horizontal waler; the inner template 2 has an inner hole 18 on the outer side of the vertical inner stiffening plate 6 to facilitate the fixed connection of the left and right adjacent templates.

[0030] In this specific embodiment, the combined steel formwork of the outer formwork 1 and the inner formwork 2 is made of cold-rolled steel plate in the area where it contacts the pouring surface. Compared with hot-rolled steel, the cold-rolling process is carried out at room temperature, resulting in less iron oxide scale, a smoother and cleaner surface, higher manufacturing dimensional accuracy, and higher rigidity and hardness, which better meets the requirements of fair-faced concrete for formwork. At the same time, the outer formwork 1 and the inner formwork 2 are coated with anti-rust paint, which has better wear resistance and toughness, meeting the needs of multiple reuses of the formwork.

[0031] This device is designed to better match the structural characteristics of the engineering entity, with the height-to-width ratio of the entire template conforming to 9:16 or 3:4, resulting in a harmonious and aesthetically pleasing appearance. In terms of width design, the outer template 1 and inner template 2 are divided equally according to the outer circumference of the circular coal yard cylinder wall. The width of each template is consistent with the width of the post-pouring strip, ensuring a consistent overall layout of the cylinder wall after the post-pouring strip is poured, with no obvious post-pouring marks. Furthermore, the bending angle of the template conforms to the arc surface, ensuring a smooth and aesthetically pleasing shape. Regarding the height design, excessively high walls cannot ensure sufficient vibration of the bottom concrete during pouring and are prone to concrete slurry segregation, causing aggregate exposure, surface watermarks and air pockets, and uneven overall concrete color. Therefore, the template is divided equally along the entire height of the wall, ensuring consistent concrete block effect and keeping the concrete vibration construction within a controllable range, preventing over-vibration or under-vibration. Considering economic efficiency, only one set of templates needs to be made and reused.

[0032] In this specific embodiment, the joint design includes visible joint construction lines around the inner perimeter of the outer formwork 1. These lines are trapezoidal in shape and consist of horizontal circumferential joints 10-1 on the top and bottom sides and vertical joints 10-2 on the left and right sides. The horizontal circumferential joints 10-1 are isosceles trapezoidal visible joint construction lines with a 45° base angle, while the vertical joints 10-2 are right-angled trapezoidal visible joint construction lines with a 45° base angle. The recessed concrete portion has a 45° angle at the external corner and is polished. The lengths of the upper and lower sides of the vertical joints 10-2 are half the lengths of the upper and lower sides of the horizontal circumferential joints 10-1, respectively. When two adjacent formwork panels are assembled, the resulting width is the same as the upper and lower lines of the formwork, ensuring consistency in appearance between the visible joint and the post-pouring strip construction joint. This results in a more aesthetically pleasing joint, resolves the negative impact of formwork splicing on appearance quality, and ensures both the casting effect of the visible joint and the convenience of formwork removal.

[0033] Three external bolt holes 11 are set in the middle of the horizontal circumferential joints 10-1 on the upper and lower sides. Three pre-drilled holes for tie bolts 4 are set in the middle of the lines on the upper and lower sides. By setting a visible joint design that is recessed into the concrete surface, the holes of the tie bolts are cleverly integrated into the groove of the visible joint. This not only places the holes of the tie bolts in the visible joint that is recessed into the concrete surface, reducing the impact of hole blockage on the appearance quality, but also cleverly integrates the formwork joint into the visible joint line, avoiding the impact of unevenness and color difference at the joint. In addition, the external corners of the visible joint line are beveled and ground, which not only improves the appearance quality of the cast-in-place molding, but also facilitates demolding and removal, and prevents damage to the concrete edges when the embedded lines are removed.

[0034] The upper and lower edges of the outer template 1 are each provided with an outer seam 13 at a third division point, where the outer stiffening plate 5 and the horizontal circumferential seam 10-1 are discontinuous; the upper and lower edges of the inner template 2 are each provided with an inner seam 14 at a third division point, where the inner stiffening plate 6 is discontinuous; the structure of the outer seam 13 and the inner seam 14 allows the entire template to be bent at a certain angle at this point to better fit the curved surface design.

[0035] The construction method of this specific implementation is as follows: First, the first floor construction is carried out, the wall positioning lines are marked, the steel reinforcement is tied and inspected, the inner and outer formwork is assembled, the horizontal secondary keel is tied and fixed, and then the vertical main keel, namely the double-ply square steel back rib, is installed and fixed, and the horizontal and verticality of the wall formwork is adjusted; then the construction is carried out in sequence: the steel back rib and locks are removed and cleaned, the steel formwork is lifted and the lower tie bolts are inserted for temporary fixation, the formwork is assembled, the horizontal secondary keel is tied and fixed, the double-ply square steel back rib is installed and fixed as the vertical main keel, and finally the horizontal and verticality of the wall formwork is adjusted.

[0036] After the first layer of the cylindrical wall is poured, and the concrete strength meets the demolding requirements, the inner and outer formwork is removed. Clean the surface of each formwork, apply release agent, and apply double-sided tape to the joints on both sides and the bottom of the formwork where it contacts the concrete surface. Then, hold the lifting handles at the top of each formwork and lift it for reuse on the next layer. Using the existing exposed joint structure of the outer formwork, accurately locate the installation positions of the upper and lower layer formwork. After positioning, insert the tie bolts in the lower row of the formwork as a temporary measure to fix the formwork. Connect adjacent formwork sections by bolts through the holes. After all are fixed, seal the bottom of the formwork with expanding foam to further prevent grout leakage during pouring.

[0037] This specific implementation method utilizes a reliable steel formwork reinforcement system with high formwork processing precision and simple splicing and installation operations. Compared to the traditional wooden formwork reinforcement system with fasteners and steel pipes, it better embodies the concept of customized and standardized construction. By applying customized combined steel formwork technology, it not only effectively controls the pouring quality of the circular coal yard cylinder wall concrete but also achieves satisfactory results in terms of structural appearance. Its technical advantages are:

[0038] (1) The surface is smooth and flat, the lines are straight and beautiful, and the appearance is excellent. The construction quality is controlled at the source, so that it reaches the technical standard of fair water concrete, which improves the quality of the concrete pouring of the cylinder wall. At the same time, it can eliminate the cost of later plastering and painting processes, greatly reduce the amount of cement and sand building materials used, and can also reduce the generation of construction waste and construction precipitation at the same time, resulting in significant economic benefits.

[0039] (2) The template is easy to operate, the material is sturdy and durable, the structural system is stable, which greatly improves the construction efficiency, the molding quality is high at the first time, and eliminates the need for large-scale repairs and rework in the later stage, reducing the cost of manpower input.

[0040] (3) The template is formed in one step, avoiding the waste of materials caused by multiple processing of templates. There are no extra materials, and no need to make or process steel pipes, square timber and other auxiliary materials. This avoids the waste of scrap materials caused by a large amount of processing. Moreover, the whole set of templates can be used for multiple reuses without any additional processing or modification measures, which further reduces the cost of use and also reduces the environmental pollution caused by the use and processing of materials.

[0041] This specific implementation method, by using a customized combined steel formwork system, not only helps to improve the quality level of the project entity and better achieve the overall goal of creating excellent project quality, but also plays a key role in construction quality, appearance quality and environmental protection. Furthermore, it implements the concept of green construction, responds to the industry's call, and provides practical solutions in all aspects such as labor consumption, forest resource protection, metal consumables and energy consumption, and has broad market application prospects.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A steel formwork for a circular coal yard retaining wall, characterized in that, The outer template (1), inner template (2), double-section square steel (3), tie bolts (4), outer stiffening plates (5), inner stiffening plates (6), lifting handles (7), hexagonal nuts (8), flat washers (9), and visible seam lines (10) are provided. An outer stiffening plate (5) is provided around the outer edge of the outer template (1). Multiple outer stiffening plates (5) are evenly distributed along the transverse and longitudinal directions on the outer surface of the outer template (1). An visible seam line (10) is provided around the inner edge of the outer template (1). Multiple outer bolt holes (11) are provided on the upper and lower sides of the outer template (1) corresponding to the visible seam line (10). An inner stiffening plate (6) is provided around the outer edge of the inner template (2). Multiple outer bolt holes (11) are provided on the upper and lower sides of the outer template (1) corresponding to the visible seam line (10). An inner stiffening plate (6) is provided around the outer edge of the inner template (2). An inner stiffening plate (6) is evenly distributed along the transverse and longitudinal directions on the outer surface of the inner template (2). The fabric has multiple inner stiffening plates (6), and the inner template (2) has inner bolt holes (12) on the upper and lower sides corresponding to the outer bolt holes (11). The outer template (1) and the inner template (2) are connected by a steel back rib reinforcement lock. The steel back rib reinforcement lock consists of tie bolts (4), hexagonal nuts (8), and flat washers (9). The tie bolts (4) pass through the double square steel (3), the outer bolt holes (11) of the outer template (1), the inner bolt holes (12) of the inner template (2), and the double square steel (3) in sequence. The connection between the tie bolts (4) and the double square steel (3) on both sides is fixed by the hexagonal nuts (8) and flat washers (9) threaded together. The outer template (1) and the inner template (2) are both equipped with lifting handles (7).

2. The steel formwork for a circular coal yard retaining wall according to claim 1, characterized in that, The visible seam line (10) consists of horizontal circumferential seams (10-1) on the upper and lower sides and vertical seams (10-2) on the left and right sides. The horizontal circumferential seam (10-1) is an isosceles trapezoidal visible seam construction line with a base angle of 45°. The vertical seam (10-2) adopts another right trapezoidal visible seam construction line with a base angle of 45°. The lengths of the upper and lower sides of the vertical seam (10-2) are half the lengths of the upper and lower sides of the horizontal circumferential seam (10-1), respectively.

3. The steel formwork for a circular coal yard retaining wall according to claim 1, characterized in that, The outer template (1) has an outer seam (13) at each of the three equal division points on its upper and lower edges. The outer stiffening plate (5) and the horizontal circumferential seam (10-1) are disconnected at the outer seam (13).

4. The steel formwork for a circular coal yard retaining wall according to claim 1, characterized in that, The inner template (2) has an inner seam (14) at each of the three equal division points on its upper and lower edges, and the inner stiffening plate (6) is broken at the inner seam (14).

5. The steel formwork for a circular coal yard retaining wall according to claim 1, characterized in that, The lifting handle (7) is a round steel pull ring. The lifting handle (7) is located in the upper middle part of the outer template (1) and the inner template (2). Two lifting handles (7) are fixed on each template. Each lifting handle (7) is welded between two adjacent stiffening plates.

6. The steel formwork for a circular coal yard retaining wall according to claim 1, characterized in that, The external bolt holes (11) are provided in three places on each side of the horizontal circumferential seam (10-1).

7. The steel formwork for a circular coal yard retaining wall according to claim 1, characterized in that, The outer template (1) has an external connecting hole (15) on the vertical stiffening plate (5) for threading wire to fix the horizontal waler; the outer template (1) has an external hole (16) on the vertical stiffening plate (5) on the outer side of the outer template (1) to facilitate the fixed connection of the left and right adjacent templates.

8. The steel formwork for a circular coal yard retaining wall according to claim 1, characterized in that, The inner template (2) has an inner connecting hole (17) on the vertical inner stiffening plate (6) for threading wire to fix the horizontal waler; the inner template (2) has an inner hole (18) on the outer side of the vertical inner stiffening plate (6) for fixing the left and right adjacent templates.

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