Cantilever beam hanging basket formwork

Abstract

The present application relates to the technical field of template, in particular to a cantilever beam hanging basket template, which comprises a frame body, a plurality of bottom rail longitudinal beams are arranged at the bottom of the frame body, an outer template is arranged above the bottom rail longitudinal beams, the outer template is used for shaping the cross-sectional shape and size of the cantilever beam, an outer mold support assembly is arranged between the outer template and the bottom rail longitudinal beams, the outer mold support assembly is used for size adjustment according to different cross-sectional shapes of the cantilever beam, an inner template is arranged inside the outer template, a vibration assembly is arranged at the bottom of the inner template, and the vibration assembly is used for regular vibration of the poured concrete during the construction of the cantilever beam, the outer mold support side plate is rotated on the surface of the rotating rod, the angle between the outer mold support side plate and the outer mold support bottom plate is adjusted, the outer mold support side plate and the outer mold support bottom plate are quickly enclosed to form the required cross-sectional shape, and after the inner wall of the outer template is filled with concrete, the outer mold support assembly is used for supporting and fixing the concrete, so that the deformation of the outer template does not affect the pouring quality of the cantilever beam.

Description

Technical Field

[0001] This invention relates to the field of template technology, and more specifically, to cantilever beam hanging basket templates. Background Technology

[0002] Hanging formwork is an essential piece of equipment used in cantilever bridge construction. When constructing long-span bridges using hanging formwork, it is not affected by factors such as pier height or river depth. Construction can proceed directly from the top of the existing piers, extending segment by segment towards the span. This casting construction process not only simplifies the construction difficulty of long-span bridges but also greatly saves time and costs associated with erecting scaffolding, making it highly popular among construction companies.

[0003] There are many existing technologies for cantilever beam hanging basket formwork, such as:

[0004] Chinese Patent Publication No. CN211498510U discloses a structurally stable cantilever beam casting formwork, including side molds, bottom molds, bottom mold crossbeams, and inner molds. The inner mold is a hollow structure, and an inner mold support rod is horizontally arranged inside the inner mold. The bottom mold has a bottom mold support frame at its bottom, and the bottom of the bottom mold support frame is fixedly connected to the bottom mold crossbeam. The side mold is provided with diagonal braces, one end of which is fixedly connected to the outer wall of the side mold, and the other end is fixedly connected to the bottom mold crossbeam. The diagonal braces are composed of support plates, support rods, and reinforcement components. The support rods are steel columns with a circular cross-section, and four semi-circular steel columns are welded to the side wall of the support rods. The reinforcement components are composed of dampers and fixing parts fixedly connected to both ends of the dampers.

[0005] When using the above-mentioned hanging basket formwork, the side forms are symmetrically set on both sides of the formwork, and the bottom formwork is set between the two side forms and fixedly connected to the two side forms to enhance the connection strength. However, when using the above-mentioned formwork, due to the different cross-sectional dimensions of the cantilever beam, it is difficult to adjust the angle between the side forms and the bottom formwork during the installation of the formwork, making the installation of the hanging basket formwork cumbersome. After the side forms are filled with concrete, they are easily deformed under pressure. Moreover, during the pouring of the cantilever beam, the concrete filled inside the hanging basket formwork is prone to voids due to the multiple staggered steel bars in the cross-section of the cantilever beam, which affects the construction quality of the cantilever beam. Therefore, we propose a hanging basket formwork for cantilever beams. Summary of the Invention

[0006] The purpose of this invention is to provide a cantilever beam hanging basket formwork to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides a cantilever beam hanging basket formwork, including a frame, with multiple bottom longitudinal beams at the bottom of the frame, and an outer formwork above the bottom longitudinal beams. The outer formwork is used to shape the cross-sectional shape and size of the cantilever beam. An outer formwork support assembly is provided between the outer formwork and the bottom longitudinal beams. The outer formwork support assembly is used to adjust the size according to different cantilever beam cross-sectional shapes, and at the same time provides support force to the outer formwork to keep it stable during construction and facilitates quick disassembly later. An inner formwork is provided inside the outer formwork, and a vibration assembly is provided at the bottom of the inner formwork. The vibration assembly is used to regularly vibrate the poured concrete during the cantilever beam construction process.

[0008] As a further improvement to this technical solution, the outer mold support assembly includes an outer mold support side plate, and an outer mold support base plate is provided at the bottom of the outer mold support side plate. The bottom of the outer mold support base plate is attached to the top of the outer mold template. The outer mold support side plate and the outer mold support base plate form a cantilever beam cross-sectional shape. The end of the outer mold support side plate is fixed to the side wall of the cantilever beam. The outer mold template is supported and fixed by the outer mold support side plate and the outer mold support base plate.

[0009] As a further improvement to this technical solution, the bottom of the outer mold support base plate is provided with a rotating rod, and the outer mold support side plate rotates on the surface of the rotating rod. The rotation of the outer mold support side plate on the surface of the rotating rod is used to adjust the cross-sectional shape of the cantilever beam.

[0010] As a further improvement to this technical solution, an elastic element is provided between the outer mold support side plate and the outer mold support bottom plate. One end of the elastic element is fixed to the outer side wall of the outer mold support side plate, and the other end is fixed to the inner side wall of the outer mold support bottom plate. The elastic element is used to limit the outer mold support bottom plate and improve the stability of the outer mold support bottom plate against the outer mold template.

[0011] As a further improvement to this technical solution, cylinders are provided on both sides of the outer mold support side plate, and the piston rod at the end of the cylinder is provided with a fixing ring, which is connected to the top of the bottom rail longitudinal beam.

[0012] As a further improvement to this technical solution, the top of the bottom longitudinal beam is provided with symmetrical fixing blocks, and the end face of the fixing blocks is provided with through holes. The fixing ring is fixed at the through holes and can be detached.

[0013] As a further improvement to this technical solution, the outer mold support base plate is fixed by a combination of multiple stepped blocks, and the size can be adjusted by adjusting the number of stepped blocks.

[0014] As a further improvement to this technical solution, the vibration component includes a support plate located at the bottom of the inner template. The support plate has a vertical plate at its top, and a through hole is opened on the end face of the vertical plate. A servo motor is located on one side of the vertical plate, and a gear is provided on the output shaft of the servo motor. A toothed moving plate is slidably connected to the side of the vertical plate away from the servo motor. The gear and the toothed moving plate mesh with the toothed inner wall. The toothed moving plate has a long rod at its top and a long rod at its bottom, and an impact block is provided on the surface of the long rod. The impact block is used to impact the inner wall of the inner template.

[0015] As a further improvement to this technical solution, the top of the impact block is provided with multiple impact balls, which are used to reduce the contact area with the inside of the inner template, thereby increasing the impact force.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. In this cantilever beam hanging basket formwork, by rotating the outer formwork support side plate on the rotating rod surface, the angle between the outer formwork support side plate and the outer formwork support bottom plate is adjusted, so that the outer formwork support side plate and the outer formwork support bottom plate can quickly surround and form the required cross-sectional shape, which facilitates the quick positioning of the outer formwork and improves the installation efficiency of the outer formwork. At the same time, after the inner wall of the outer formwork is filled with concrete, it is supported and fixed by the outer formwork support assembly to avoid deformation of the outer formwork affecting the pouring quality of the cantilever beam.

[0018] 2. In this cantilever beam hanging basket formwork, during the pouring process, the inner wall of the inner formwork is impacted by a vibration component. The inner formwork vibrates under the impact of the vibration component, and the vibration causes the concrete to be evenly filled into the hanging basket formwork, filling the voids that occur during the pouring process, thus avoiding voids inside the cantilever beam and improving the construction quality of the cantilever beam. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the inner template of the present invention;

[0020] Figure 2 For the present invention Figure 1 Schematic diagram at point A;

[0021] Figure 3 For the present invention Figure 1 A partial schematic diagram;

[0022] Figure 4 This is a planar schematic diagram of the present invention;

[0023] Figure 5 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 6 This is a cross-sectional view of the overall structure of the present invention;

[0025] Figure 7This is a schematic diagram of the outer mold support base plate structure of the present invention;

[0026] Figure 8 This is a cross-sectional view of the vibration component of the present invention.

[0027] The meanings of the labels in the diagram are as follows:

[0028] 100. Frame structure; 101. Bottom railing longitudinal beam;

[0029] 200. Outer template; 300. Outer mold support assembly; 301. Outer mold support side plate; 302. Outer mold support base plate; 303. Elastic element; 304. Cylinder; 305. Fixing ring;

[0030] 400, Inner template; 500, Vibration component; 501, Support plate; 502, Vertical plate; 503, Toothed moving plate; 504, Gear; 505, Impact block; 506, Impact ball. Detailed Implementation

[0031] Please see Figures 1-8 As shown, the purpose of this embodiment is to provide a cantilever beam hanging basket formwork, including a frame 100. The bottom of the frame 100 is provided with multiple bottom longitudinal beams 101. An outer formwork 200 is provided above the bottom longitudinal beams 101. The outer formwork 200 is used to shape the cross-sectional shape and size of the cantilever beam. An outer formwork support assembly 300 is provided between the outer formwork 200 and the bottom longitudinal beams 101. The outer formwork support assembly 300 is used to adjust the size according to different cantilever beam cross-sectional shapes, and at the same time provides support force to the outer formwork 200 so that it can remain stable during construction. At the same time, it is easy to disassemble quickly later. An inner formwork 400 is provided inside the outer formwork 200. A vibration assembly 500 is provided at the bottom of the inner formwork 400. The vibration assembly 500 is used to regularly vibrate the poured concrete during the cantilever beam construction process.

[0032] By fixing the frame 100 to the surface of the already poured cantilever beam, and to facilitate the rapid installation of the hanging basket formwork, an outer formwork support base plate 302 is fixed to the top of the bottom longitudinal beam 101. The dimensions of the cantilever beam are calculated, and the number of step blocks is adjusted to ensure the outer formwork support base plate 302 is appropriately sized. The outer formwork support side plate 301 rotates on the rotating rod surface at the bottom of the outer formwork support base plate 302. An elastic element 303 is provided between the outer formwork support side plate 301 and the outer formwork support base plate 302. The elastic element 303 limits the angle between the outer formwork support side plate 301 and the outer formwork support base plate 302, thus forming a cantilever beam. The cross-section is the same as the dimensions of the completed cantilever beam. When installing the outer formwork 200, the installation efficiency is improved by quickly fixing the outer formwork support component 300. At the same time, in order to avoid excessive gravity applied by the outer formwork 200 to the outer formwork support component 300, which could cause local deformation of the outer formwork support component 300 and affect normal use, cylinders 304 are provided on both sides of the outer formwork support side plate 301. The piston rod at the end of the cylinder 304 is provided with a fixing ring 305. The fixing ring 305 is fixed to the fixing block through hole at the top of the bottom longitudinal beam 101, thereby supporting the outer formwork support side plate 301 and forming a triangular stable shape, so as to avoid the outer formwork support component 300 from being deformed due to excessive external pressure.

[0033] To facilitate rapid support and fixation of the outer formwork 200 and ensure the cross-sectional shape and size of the cantilever beam, the outer formwork support assembly 300 includes an outer formwork support side plate 301. The bottom of the outer formwork support side plate 301 is provided with an outer formwork support base plate 302. The bottom of the outer formwork support base plate 302 is attached to the top of the outer formwork 200. The outer formwork support side plate 301 and the outer formwork support base plate 302 together form the cross-sectional shape of the cantilever beam. The end of the outer formwork support side plate 301 is fixed to the side wall of the cantilever beam. The outer formwork 200 is supported and fixed through the outer formwork support side plate 301 and the outer formwork support base plate 302.

[0034] In practical use, the outer formwork support base plate 302 is fixed to the bottom of the bottom longitudinal beam 101. The outer formwork support side plate 301 and the outer formwork support base plate 302 are combined to form the required cross-sectional shape and size. When pouring concrete for the outer formwork 200, the outer formwork support component 300 supports and fixes the outer formwork 200, preventing the outer formwork 200 from deforming under the pressure of the concrete. Thus, while quickly supporting and fixing the outer formwork 200, the pouring quality of the cantilever beam is ensured.

[0035] Considering that the cross-sectional shape of the cantilever beam needs to be finely adjusted during construction, and in order to facilitate quick adjustment of the angle of the outer formwork support side plate 301, a rotating rod is provided at the bottom of the outer formwork support base plate 302. The outer formwork support side plate 301 rotates on the surface of the rotating rod to adjust the cross-sectional shape of the cantilever beam.

[0036] In practical use, by rotating the outer mold support side plate 301 on the rotating rod surface, the included angle between the outer mold support side plate 301 and the outer mold support bottom plate 302 can be adjusted, thereby facilitating quick fine-tuning of the cantilever beam cross-sectional shape and improving the cantilever beam casting efficiency.

[0037] Since the cantilever beam has the same cross-section and dimensions during casting, in order to improve casting efficiency, an elastic element 303 is provided between the outer formwork support side plate 301 and the outer formwork support base plate 302 when installing the outer formwork support assembly 300. One end of the elastic element 303 is fixed to the outer side wall of the outer formwork support side plate 301, and the other end is fixed to the inner side wall of the outer formwork support base plate 302. The elastic element 303 is used to limit the outer formwork support base plate 302 and improve the stability of the outer formwork support base plate 302 against the outer formwork 200.

[0038] In practical use, the elastic element 303 limits the outer mold support base plate 302, causing the elastic element 303 to fit against the outer wall of the outer template 200. By fixing the end of the elastic element 303 to the side wall of the cantilever beam, the outer mold support base plate 302 can quickly support and fix the outer template 200. Moreover, when installing the outer mold support assembly 300, the outer mold support side plate 301 and the outer mold support base plate 302 are fixed in position by the force of the elastic element 303, which facilitates the quick installation of the outer mold support assembly 300. The outer mold support assembly 300 provides support for the outer template 200, improving the stability of the outer template 200.

[0039] After the angle of the outer mold support component 300 is fixed and adjusted, in order to prevent the outer mold support component 300 from being deformed by external pressure, cylinders 304 are provided on both sides of the outer mold support side plate 301. The piston rod at the end of the cylinder 304 is provided with a fixing ring 305, and the fixing ring 305 is connected to the top of the bottom rail longitudinal beam 101.

[0040] In practical use, the bottom of the cylinder 304 is fixed to the outer wall of the outer mold support side plate 301, and the piston rod at the end of the cylinder 304 extends to the top of the bottom rail longitudinal beam 101. The piston rod is fixed to the top of the bottom rail longitudinal beam 101 by the fixing ring 305 at the end of the piston rod. Since the bottom rail longitudinal beam 101 is fixed to the surface of the frame 100, the support force of the outer mold support assembly 300 is improved by controlling the length of the piston rod at the end of the cylinder 304, thus avoiding the outer mold support assembly 300 from being deformed by excessive external pressure.

[0041] After the cantilever beam is formed, in order to facilitate the quick disassembly of the outer mold support assembly 300, the bottom longitudinal beam 101 is provided with symmetrical fixing blocks at the top. The end face of the fixing block is provided with a through hole, and the fixing ring 305 is fixed at the through hole and can be removed. By removing the fixing ring 305 from the through hole, the cylinder 304 is moved away from the fixing block, thereby facilitating the quick disassembly of the outer mold support assembly 300.

[0042] In response to the sustainable development strategy, after the cantilever beam is poured, the outer formwork support base plate 302 is disassembled to facilitate subsequent cantilever beam pouring projects. Since different projects have different cross-sectional shapes and dimensions of the cantilever beam, the outer formwork support base plate 302 is fixed by a combination of multiple stepped blocks. The dimensions can be adjusted by adjusting the number of stepped blocks.

[0043] In practical use, by adjusting the number of stepped blocks on the outer mold support base plate 302, the outer mold support base plates 302 are assembled and fixed with bolts, thereby quickly adjusting the cross-sectional dimensions of different cantilever beams. Moreover, by splicing multiple stepped blocks together, the overall weight of the outer mold support assembly 300 is reduced during installation, making it easier to operate.

[0044] Considering that during the pouring of the cantilever beam, since the pouring material is concrete, and the cantilever beam section has multiple reinforcing bars, the staggered arrangement of the reinforcing bars can easily lead to voids during the pouring process. To avoid voids during the pouring of the cantilever beam, the vibration assembly 500 includes a support plate 501 located at the bottom of the inner formwork 400. The top of the support plate 501 is provided with a vertical plate 502, and the end face of the vertical plate 502 has a through hole. A servo motor is provided on one side of the vertical plate 502, and the output shaft of the servo motor is provided with a gear 504. A toothed moving plate 503 is slidably connected to the side of the vertical plate 502 away from the servo motor. The gear 504 and the inner wall of the toothed moving plate 503 are meshed with teeth. The top of the toothed moving plate 503 is provided with a long rod at the bottom, and the surface of the long rod is provided with an impact block 505. The impact block 505 is used to impact the inner wall of the inner formwork 400.

[0045] In practical use, the servo motor is started to drive the gear 504 to rotate. The gear 504 has a rack on one side and a smooth side on the other. The gear 504 rotates coaxially with the servo motor on the inner wall of the toothed moving plate 503. The side of the gear 504 with the rack meshes with the inner wall of the toothed moving plate 503, causing the toothed moving plate 503 to slide up and down. At the same time, since the top of the toothed moving plate 503 has a long rod with an impact block 505 on its surface, the impact block 505 is driven to impact the inner wall of the inner template 400 when the toothed moving plate 503 slides up and down. When the concrete is poured, the inner template 400 vibrates under the impact of the impact block 505, which fills the voids generated during the concrete pouring process, thereby improving the pouring quality of the cantilever beam.

[0046] In order to improve the vibration effect of the vibration component 500 and quickly fill the empty space during the cantilever beam casting process, the top of the impact block 505 is provided with multiple impact balls 506. The impact balls 506 are used to reduce the contact area with the inside of the inner template 400, thereby increasing the impact force.

[0047] In practical use, multiple impact balls 506 are set on the top of the impact block 505. Since the contact area between the impact ball 506 and the inner template 400 is small, a large external force is applied to the inner template 400, causing the concrete near the inner template 400 to vibrate, so that the empty space is quickly filled and the quality of the cantilever beam is improved.

[0048] In practical use, the frame 100 is fixed to the surface of the completed cantilever beam. To facilitate quick installation of the hanging basket formwork, an outer formwork support base plate 302 is fixed to the top of the bottom longitudinal beam 101. By calculating the cantilever beam dimensions and adjusting the number of step blocks, the dimensions of the outer formwork support base plate 302 are adapted. The outer formwork support side plate 301 rotates on the rotating rod surface at the bottom of the outer formwork support base plate 302. An elastic element 303 is provided between the outer formwork support side plate 301 and the outer formwork support base plate 302 to limit the angle between them. The cross-section of the cantilever beam formed by the outer formwork support side plate 301 and the outer formwork support bottom plate 302 is the same as the dimensions of the cast-in-place cantilever beam. This allows for rapid fixing of the outer formwork support assembly 300 during the installation of the outer formwork 200, improving installation efficiency. Simultaneously, to prevent excessive weight applied by the outer formwork 200 to the outer formwork support assembly 300, which could lead to localized deformation and affect normal use, cylinders 304 are provided on both sides of the outer formwork support side plate 301. The piston rod at the end of each cylinder 304 is equipped with a fixing ring 305, which is used to fix the cylinder to the top of the bottom longitudinal beam 101. At the through hole, the outer mold support side plate 301 is supported, forming a triangular stable shape to prevent the outer mold support assembly 300 from deforming due to excessive external pressure. During the pouring of the cantilever beam, because the cantilever beam section has multiple reinforcing bars, the staggered arrangement of these bars can easily lead to voids during pouring. To avoid voids during the pouring of the cantilever beam, a servo motor is started to drive the gear 504 to rotate. One side of the gear 504 has a rack, and the other side is smooth. The gear 504 rotates coaxially with the servo motor on the inner wall of the toothed moving plate 503. The side of the gear 504 with the rack passes through... The inner wall of the toothed moving plate 503 engages, causing the toothed moving plate 503 to slide up and down. At the same time, since the top of the toothed moving plate 503 is equipped with a long rod, and the surface of the long rod is equipped with an impact block 505, the inner wall of the inner template 400 is impacted when the impact block 505 slides up and down on the surface of the toothed moving plate 503. When the concrete is poured for the cantilever beam, the inner template 400 vibrates under the impact of the impact block 505, causing the concrete poured in the hanging basket formwork to vibrate at the same frequency. Through vibration, the concrete fills the empty spaces, avoiding empty spaces on the inner wall of the cantilever beam formwork during the pouring process, thereby improving the pouring quality of the cantilever beam.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cantilever beam hanging basket formwork, characterized in that: The system includes a frame (100), with multiple bottom longitudinal beams (101) at the bottom of the frame (100). An outer template (200) is provided above the bottom longitudinal beams (101). The outer template (200) is used to shape the cross-sectional shape and size of the cantilever beam. An outer formwork support assembly (300) is provided between the outer template (200) and the bottom longitudinal beams (101). The outer formwork support assembly (300) is used to adjust the size according to different cross-sectional shapes of the cantilever beam, and at the same time, it provides support force to the outer template (200) so that it can remain stable during construction and facilitates quick disassembly later. An inner template (400) is provided inside the outer template (200). A vibration assembly (500) is provided at the bottom of the inner template (400). The vibration assembly (500) is used to regularly vibrate the poured concrete during the construction of the cantilever beam. The vibration assembly (500) includes a support plate (501) located at the bottom of the inner template (400). The support plate (501) has a vertical plate (502) at its top. The end face of the vertical plate (502) has a through hole. A servo motor is located on one side of the vertical plate (502). A gear (504) is located on the output shaft of the servo motor. A toothed moving plate (503) is slidably connected to the side of the vertical plate (502) away from the servo motor. The gear (504) and the toothed moving plate (503) have meshing teeth on their inner walls. The toothed moving plate (503) has a long rod at its top and a striking block (505) on its surface. The striking block (505) is used to impact the inner wall of the inner template (400). The striking block (505) has multiple striking balls (506) at its top. The striking balls (506) are used to reduce the contact area with the inside of the inner template (400), thereby increasing the impact force.

2. The cantilever beam hanging basket formwork according to claim 1, characterized in that: The outer mold support assembly (300) includes an outer mold support side plate (301), and an outer mold support base plate (302) is provided at the bottom of the outer mold support side plate (301). The bottom of the outer mold support base plate (302) is attached to the top of the outer template (200). The outer mold support side plate (301) and the outer mold support base plate (302) form a cantilever beam cross-section. The end of the outer mold support side plate (301) is fixed to the side wall of the cantilever beam. The outer template (200) is supported and fixed by the outer mold support side plate (301) and the outer mold support base plate (302).

3. The cantilever beam hanging basket formwork according to claim 2, characterized in that: The bottom of the outer mold support base plate (302) is provided with a rotating rod, and the outer mold support side plate (301) rotates on the surface of the rotating rod. The rotation of the outer mold support side plate (301) on the surface of the rotating rod is used to adjust the cross-sectional shape of the cantilever beam.

4. The cantilever beam hanging basket formwork according to claim 3, characterized in that: An elastic element (303) is provided between the outer mold support side plate (301) and the outer mold support base plate (302). One end of the elastic element (303) is fixed to the outer side wall of the outer mold support side plate (301), and the other end is fixed to the inner side wall of the outer mold support base plate (302). The elastic element (303) is used to limit the outer mold support base plate (302) and improve the stability of the outer mold support base plate (302) against the outer template (200).

5. The cantilever beam hanging basket formwork according to claim 4, characterized in that: The outer mold support side plate (301) is provided with cylinders (304) on both sides. The piston rod at the end of the cylinder (304) is provided with a fixing ring (305). The fixing ring (305) is connected to the top of the bottom rail longitudinal beam (101).

6. The cantilever beam hanging basket formwork according to claim 5, characterized in that: The bottom longitudinal beam (101) is provided with symmetrical fixing blocks at the top. The end face of the fixing block is provided with a through hole, and the fixing ring (305) is fixed at the through hole and can be removed.

7. The cantilever beam hanging basket formwork according to claim 3, characterized in that: The outer mold support base plate (302) is fixed by a combination of multiple stepped blocks, and the size can be adjusted by adjusting the number of stepped blocks.

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