Disclosed is a disc buckle group qualified column post-pouring zone independent support system

Abstract

The utility model relates to a post-pouring strip supporting technology field especially discloses a disc buckle group qualified column post-pouring strip independent supporting system, in the utility model, a plurality of lattice columns are arranged along the post-pouring strip and the frame beam boundary line, can accurately support the post-pouring strip area and the surrounding structure, effectively disperses and bears the load in the construction process, guarantees the stability of the post-pouring strip before and after the structure is poured, avoids the problems such as deformation, crack and the like caused by insufficient support. Each lattice column is arranged along the length direction by a plurality of disc buckle type structure units, the disc buckle type structure has the characteristics of convenient connection and quick dismounting, facilitates the quick erection and removal of the supporting system in the construction process, improves the construction efficiency, meanwhile, the modular design makes the lattice column can be flexibly adjusted in height and size according to the actual engineering demand, enhances the universality and adaptability of the supporting system, can also guarantee the structural strength and stability of the lattice column itself, provides reliable support guarantee for the whole post-pouring strip construction.

Description

Technical Field

[0001] This utility model relates to the field of casting strip support technology, and specifically to an independent support system for the casting strip of a lattice column with a disc-lock combination. Background Technology

[0002] In the field of construction engineering, traditional methods of supporting post-cast strips have many drawbacks. Generally, steel pipe couplers and disc-lock scaffolding are used for independent support at the post-cast strip. During construction, when the formwork support systems on both sides of the structure are removed, the post-cast strip support system cannot be removed and must be retained. It must remain until the concrete within the post-cast strip is poured and cured for the specified time before the support system can be removed. However, generally, the post-cast strip requires the building's settlement or shrinkage function to stabilize before concrete pouring can begin. This traditional method results in a long retention period for the support systems on both sides of the post-cast strip, occupying a large amount of formwork and support materials over time. This not only significantly increases construction costs and management difficulty, but also, over time, the post-cast strip formwork support system is prone to loosening and accumulates a large amount of debris, which is difficult to clean and seriously affects the quality of the construction project. Utility Model Content

[0003] The purpose of this invention is to provide an independent support system for the post-cast strip of a disc-locked lattice column in order to solve the problems existing in the prior art.

[0004] In order to solve the problems existing in the prior art, the present invention adopts the following technical solution:

[0005] A modular lattice column post-cast strip independent support system includes multiple lattice columns, which are arranged along the post-cast strip and the edge line of the frame beam;

[0006] Each of the lattice columns includes multiple interlocking structural units, which are arranged along the length of the lattice column.

[0007] As an improvement to the technical solution of the independent support system for the post-cast strip of the disc-lock combined lattice column of this utility model, the plurality of disc-lock structural units include a top disc-lock structural unit and a bottom disc-lock structural unit.

[0008] The top disc-type structural unit includes an adjustable support, a screw, an adjusting nut, a vertical rod, and a horizontal rod; the vertical rod and the horizontal rod are vertically connected, the vertical rod is provided with an adjusting nut, and the adjusting nut is fitted with a screw, the top of the screw is provided with the adjustable support; wherein, the screw can extend or retract relative to the vertical rod;

[0009] The bottom disc-type structural unit includes an adjustable base, in which a lead screw is inserted, and the lead screw is inserted into the adjustable support.

[0010] As an improvement to the technical solution of the independent support system for the post-cast strip of the disc-lock combined lattice column of this utility model, at least one intermediate disc-lock structural unit is provided between the top disc-lock structural unit and the bottom disc-lock structural unit.

[0011] At least one of the intermediate disc-type structural units includes a screw, an adjusting nut, a vertical rod, and a horizontal rod; the horizontal rod is perpendicular to the vertical rod, the vertical rod is provided with an adjusting nut, and the adjusting nut is fitted with a screw, which can extend or retract relative to the vertical rod.

[0012] As an improvement to the technical solution of the independent support system for the post-cast strip of the disc-lock combined lattice column of this utility model, at least one intermediate disc-lock structural unit is provided between the top disc-lock structural unit and the bottom disc-lock structural unit.

[0013] At least one of the intermediate disc snap-fit ​​structural units includes a vertical pole and a horizontal pole, wherein a disc is provided on the vertical pole and the horizontal pole is provided on the outer periphery of the disc;

[0014] Along the circumference of the disk, a plurality of pin holes are provided on the disk; the end of the horizontal rod is provided with a connector, and the connector is provided with a through groove; the pin passes through the through groove and is inserted into the pin hole.

[0015] As an improvement to the technical solution of the independent support system for the post-cast strip of the disc-lock combination lattice column of this utility model, a sweeping rod is provided at the bottom between adjacent lattice columns.

[0016] As an improvement to the technical solution of the independent support system for the post-cast strip of the lattice column of the present invention, the top of the lattice column is provided with a top beam, the bottom of the top beam is provided with a beam bottom template, and the bottom of the slab bottom template is provided at the bottom.

[0017] As an improvement to the technical solution of the independent support system for the post-cast strip of the disc-lock combination lattice column of this utility model, the top beam and the bottom template of the slab are made of wood plywood.

[0018] The beneficial effects of this utility model are:

[0019] 1. In this utility model, multiple lattice columns are set along the post-cast strip and the edge line of the frame beam, which can accurately support the post-cast strip area and the surrounding structure, effectively disperse and bear the load during construction, ensure the stability of the structure before and after the post-cast strip is poured, and avoid problems such as deformation and cracks caused by insufficient support. Each lattice column is composed of multiple disc-lock structural units set along the length direction. The disc-lock structure has the characteristics of convenient connection and quick assembly and disassembly, which facilitates the rapid construction and dismantling of the support system during construction, improving construction efficiency. At the same time, its modular design allows the height and size of the lattice column to be flexibly adjusted according to the actual project needs, enhancing the versatility and adaptability of the support system, and ensuring the structural strength and stability of the lattice column itself, providing reliable support for the entire post-cast strip construction.

[0020] Moreover, this invention has significant advantages over traditional post-cast strip support methods. Multiple lattice columns are set along the edges of the post-cast strip and frame beams, and each lattice column is composed of multiple interlocking structural units along its length. This design forms a stable support structure, reducing the risk of loosening due to long-term retention and ensuring project quality. The interlocking structural units make the installation and disassembly of the support system more convenient, shortening the retention time of the support systems on both sides of the post-cast strip, reducing the long-term occupation of formwork and support materials, and lowering construction costs and management difficulty. Simultaneously, the stable support system is less prone to problems such as debris accumulation due to loosening, avoiding negative impacts on project quality caused by cleaning difficulties, and is more adaptable to the needs of building construction.

[0021] 2. Compared with traditional construction techniques, the modular scaffolding grid column of this utility model serves as an independent support with a clear force transmission system. It can effectively bear the load of the post-pouring strip, improve the overall stability and safety of the structure, and avoid the problem of garbage accumulation at the post-pouring strip, thus greatly improving the quality of engineering construction.

[0022] 3. This utility model only requires the erection of disc-lock scaffolding at the bottom of the beams on both sides of the post-pouring strip or in the middle of the slab span. The installation and dismantling of this utility model are relatively simple, requiring no large amount of scaffolding, saving manpower and time, and is suitable for large-scale promotion. Compared with traditional construction techniques, the construction process is simple, the construction speed is fast, and the efficiency is high, which can greatly save the construction period and cost.

[0023] 4. This utility model significantly reduces the stockpiling of formwork, timber, steel pipes and scaffolding, and the construction process is simple and highly operable, reducing labor input and construction period, thus reducing costs and increasing efficiency. Attached Figure Description

[0024] Figure 1 This is a diagram showing the layout of the post-cast strip lattice columns in this utility model;

[0025] Figure 2 for Figure 1Sectional view 1-1;

[0026] Figure 3 for Figure 1 Sectional view 2-2;

[0027] Figure 4 for Figure 3 Enlarged view of point A in the image;

[0028] Figure 5 This is a schematic diagram of the top disc-type structural unit in this utility model;

[0029] Figure 6 This is a schematic diagram of the bottom disc-type structural unit in this utility model.

[0030] Explanation of reference numerals in the attached diagram: 1 - lattice column; 2 - top beam formwork; 3 - adjustable support; 4 - screw rod; 5 - adjusting nut; 6 - upright; 7 - horizontal bar; 8 - adjustable base; 9 - lead screw; 10 - post-pouring strip; 11 - top disc-lock structural unit; 12 - bottom disc-lock structural unit; 13 - middle disc-lock structural unit. Detailed Implementation

[0031] To make the invention objective, technical solution and beneficial effects of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0032] like Figures 1 to 6 As shown, a modular lattice column post-cast strip independent support system includes multiple lattice columns 1, which are arranged along the post-cast strip 10 and the edge line of the frame beam.

[0033] Each lattice column 1 includes multiple interlocking structural units, which are arranged along the length of the lattice column 1.

[0034] In this invention, multiple lattice columns 1 are arranged along the post-cast strip 10 and the edge of the frame beam. This allows for precise support of the post-cast strip 10 area and surrounding structure, effectively distributing and bearing the load during construction, ensuring the stability of the post-cast strip 10 structure before and after pouring, and avoiding problems such as deformation and cracks caused by insufficient support. Each lattice column 1 consists of multiple interlocking structural units arranged along its length. The interlocking structure is characterized by convenient connection and quick assembly / disassembly, facilitating the rapid construction and dismantling of the support system during construction, thus improving construction efficiency. At the same time, its modular design allows the height and size of the lattice column 1 to be flexibly adjusted according to actual engineering needs, enhancing the versatility and adaptability of the support system, while also ensuring the structural strength and stability of the lattice column 1 itself, providing reliable support for the entire construction of the post-cast strip 10.

[0035] Moreover, this utility model has significant advantages over traditional post-cast strip 10 support methods. Multiple lattice columns 1 are set along the post-cast strip 10 and the edge line of the frame beam, and each lattice column 1 is composed of multiple disc-lock structural units along the length direction. This design forms a stable support structure, reduces the risk of loosening of the support system due to long-term retention, and ensures project quality. The combination method of disc-lock structural units makes the installation and disassembly of the support system more convenient, shortens the retention time of the support system on both sides of the post-cast strip 10, reduces the long-term occupation of formwork and support materials, and reduces construction costs and management difficulty. At the same time, the stable support system is less prone to problems such as garbage accumulation due to loosening, avoids the negative impact of cleaning difficulties on project quality, and is more suitable for the needs of building construction.

[0036] In some embodiments of this utility model, the multiple disc-lock structural units include a top disc-lock structural unit 11 and a bottom disc-lock structural unit 12.

[0037] The top disc-type structural unit 11 includes an adjustable support 3, a screw 4, an adjusting nut 5, an upright 6, and a horizontal bar 7; the upright 6 and the horizontal bar 7 are vertically connected, the upright 6 is provided with an adjusting nut 5, and the adjusting nut 5 is provided with a screw 4, the top of the screw 4 is provided with an adjustable support 3; wherein, the screw 4 can extend or retract relative to the upright 6; the bottom disc-type structural unit 12 includes an adjustable base 8, the adjustable base 8 is provided with a lead screw 9, and the lead screw 9 is inserted into the adjustable support 3.

[0038] In detail, in the top disc-lock structural unit 11, the adjustable support 3, screw 4, and adjusting nut 5 work together to allow the upright 6 to flexibly adjust its height, precisely adapting to different construction height requirements and improving the versatility of the support system. The screw 4 can extend or retract relative to the upright 6, facilitating quick adjustment of the support height according to actual project conditions and improving construction efficiency. The adjustable base 8 of the bottom disc-lock structural unit 12 is connected to the threaded rod 9, which is inserted into the adjustable support 3. This ensures the stability of the upper and lower connections of the support system, enhances the overall structural strength, and allows for fine-tuning of the base to adapt to different ground conditions, enabling the support system to work stably in various complex construction environments and further ensuring construction safety and quality.

[0039] As the first specific embodiment of this implementation, at least one intermediate disc-lock structural unit 13 is provided between the top disc-lock structural unit 11 and the bottom disc-lock structural unit 12;

[0040] At least one intermediate disc buckle structural unit 13 includes a screw 4, an adjusting nut 5, a vertical rod 6 and a horizontal rod 7; the horizontal rod 7 is perpendicular to the vertical rod 6, the vertical rod 6 is provided with an adjusting nut 5, and the adjusting nut 5 is provided with a screw 4, which can extend or retract relative to the vertical rod 6.

[0041] In detail, in this embodiment, the screw 4 can extend or retract relative to the upright 6 within the adjusting nut 5, allowing for flexible adjustment of the support system's height. This adapts to the height requirements of different construction projects, enhancing the versatility and applicability of the support system. The horizontal bar 7 is vertically positioned to the upright 6, and combined with the adjustment function of the screw 4, it enhances the overall stability of the support system, ensuring reliable support at different construction stages. This adjustable design also allows for timely adjustments during construction based on actual loads, settlement, and other conditions, reducing engineering quality problems caused by improper support, lowering safety hazards, improving construction efficiency, and ensuring the smooth progress of the project.

[0042] As a second specific embodiment of this implementation, at least one intermediate disc-type structural unit 13 is provided between the top disc-type structural unit 11 and the bottom disc-type structural unit 12.

[0043] At least one intermediate disc snap-fit ​​structural unit 13 includes a vertical rod 6 and a horizontal rod 7, with a disc provided on the vertical rod 6 and the horizontal rod 7 provided on the outer periphery of the disc;

[0044] Multiple pin holes are provided on the disc along its circumference; a connector is provided at the end of the horizontal rod 7, and a through groove is provided on the connector; a pin passes through the through groove and is inserted into the pin hole.

[0045] In detail, in this embodiment, the intermediate disc-type structural unit 13 allows for flexible adjustment of the support system height according to the actual height requirements of the post-cast strip 10, enhancing its applicability. The combination of discs, pin holes, connectors, and pins between the uprights 6 and the horizontal bars 7 ensures tight connection of all components, forming a stable spatial frame structure that effectively improves the overall stability and load-bearing capacity of the support system. The pin connection method is simple to operate, facilitating quick installation and disassembly, improving construction efficiency, and allowing for flexible adjustment of the structural layout according to actual conditions during construction. It also reduces safety hazards caused by loose connections, ensuring construction safety and project quality.

[0046] In some embodiments of this utility model, a ground-level bracing bar is provided at the bottom between adjacent lattice columns 1. The ground-level bracing bar at the bottom of adjacent lattice columns 1 effectively connects them into a whole, enhancing the horizontal stability of the support system, reducing the risk of tilting or displacement of the lattice columns 1 due to uneven stress, and preventing safety hazards and quality problems caused by unstable foundations. Simultaneously, the ground-level bracing bar restricts the swaying of the bottom of the lattice columns 1, preventing the support system from affecting construction operations, providing a safer and more stable working environment for construction personnel, ensuring safe and orderly construction, and also improving construction accuracy, ensuring the stability and reliability of the post-cast strip 10 support system.

[0047] In some embodiments of this utility model, a top beam is provided at the top of the lattice column 1, and a top beam template 2 is provided below the top beam.

[0048] Furthermore, the top beam and top beam formwork are made of wood plywood.

[0049] In detail, the top beam enhances the load-bearing capacity and stability of the top of the lattice column 1, and can more evenly transfer the load above to the lattice column 1, ensuring the stability of the support system; the bottom formwork and top beam formwork provide forming space for concrete pouring, ensuring the shape and dimensional accuracy of the beam and slab structure.

[0050] The top beam and top beam formwork are made of plywood, which is lightweight and flexible, making it easy for construction workers to handle and install, thus effectively improving construction efficiency. At the same time, the smooth surface of plywood can result in better quality concrete after pouring, reducing the need for later grinding and repair. In addition, plywood is a relatively economical building material, and its use can reduce project costs while ensuring construction quality, achieving a win-win situation of economic benefits and construction quality.

[0051] Furthermore, a 300×300mm disc-lock lattice column 1 independent support system is erected at the bottom of the beams on both sides of the post-pouring strip 10, the middle of the slab span (for slabs larger than 6m), and the corner of the floor slab. The independent support system of the lattice column 1 of the post-pouring strip 10 is erected together with the formwork support system on both sides of the post-pouring strip 10. The top formwork and timber are disconnected from the formwork and timber of the beams and slabs on both sides of the post-pouring strip 10, and the independent support system of the lattice column 1 of the post-pouring strip 10 is not connected to the formwork support system on both sides of the post-pouring strip 10.

[0052] As a specific embodiment of this utility model, the construction of this utility model includes the following steps:

[0053] S1, Measurement and Setting Out

[0054] First, the post-cast strip 10 and the edge line of the frame beam are measured according to the axis position. Then, the positioning points of the independent support system uprights 6 of the lattice column 1 are measured according to the post-cast strip 10 and the edge line of the frame beam. Finally, the position lines of the longitudinal and transverse uprights 6 are marked on the foundation with ink lines.

[0055] Then, the floor elevation is transferred to the longitudinal reinforcement of the wall columns, and floor elevation control points are set. The setting of elevation control points must meet the control requirements of the on-site frame beam elevation. The bottom elevation of the frame beam is controlled by the transferred elevation.

[0056] S2. Construct the independent support system for the lattice column 1.

[0057] First, the independent support system for the 10 lattice columns in the post-cast strip adopts a standard (Type B) socket-type disc-lock steel pipe scaffold. The outer diameter of the upright 6 of the standard disc-lock scaffold is Φ48.3×3.2mm, and the material is Q355 high-strength low-alloy steel; the outer diameter of the horizontal bar 7 is Φ48.3×2.5mm, and the material is Q235 high-strength low-alloy steel; the outer diameter of the adjustable base and the adjustable support 3 screw rod 9 is 38mm, and the material is Q235 high-strength low-alloy steel.

[0058] Then, a 300×300mm disc-lock lattice column 1 is set at a distance of 200mm from the 10th side of the post-pouring strip. Horizontal bars 7 need to be set on all four sides of the disc-lock lattice column 1. The ground sweep bar is 350mm from the ground. The vertical bar 6 has a step distance of 500mm. The top step distance is 500mm. The vertical bar 6 extends ≤500mm beyond the top horizontal bar 7.

[0059] Preferably, the independent support system of the lattice column 1 is set at the bottom of the beams on both sides of the post-cast strip 10, the middle of the slab span (for slabs larger than 6m), and the corner of the floor slab, 200mm away from the edge of the post-cast strip 10. When the beam span is greater than 6m, an additional lattice column 1 needs to be added in the middle of the slab.

[0060] Among them, the cantilever length of the adjustable support 3 threaded rod 9 extending out of the top horizontal bar 7 of the independent support system of the post-cast strip 10 lattice column 1 should not exceed 650mm, and the exposed length of the threaded rod 9 should not exceed 400mm. The length of the adjustable support 3 inserted into the upright 6 should not be less than 150mm.

[0061] Then, the length of the adjustable base screw rod 9 inserted into the upright 6 of the independent support system of the post-cast strip 10 grid column 1 shall not be less than 150mm, the exposed length of the screw rod 9 shall not be greater than 300mm, and the distance between the center line of the bottom horizontal bar 7 (sweeping bar) and the bottom plate of the adjustable base shall not be greater than 550mm.

[0062] Then, after the pins of the independent support system of the 10 lattice columns 1 in the post-cast strip are tightened, the arc surface of the end of the fastener should be in contact with the outer surface of the upright 6. The pin connection between the end fastener and the connecting plate should not be pulled out after being hammered and self-locked. When erecting the lattice column 1, it is advisable to use a hammer of not less than 0.5 kg to strike the top surface of the pin at least twice until the pin is tightened. After tightening, it should be struck again. The amount of pin sinking should not be greater than 3 mm.

[0063] S3, Installation of primary and secondary keels

[0064] First, the secondary keel of the independent support system of the 10-lattice column in the post-pouring strip is made of 40×90mm timber, which is set perpendicular to the direction of the 10-position post-pouring strip and has the same length as the bottom or top beam formwork; the main keel is made of φ48×2.7 double steel pipe, which is set parallel to the direction of the 10-position post-pouring strip.

[0065] Then, the independent support system of the lattice column 1 of the post-pouring strip 10 is erected together with the formwork support system on both sides of the post-pouring strip 10. The timber at the top of the lattice column 1 needs to be disconnected from the timber at other beams and slabs, and the independent support system of the lattice column 1 of the post-pouring strip 10 is not connected to other formwork support systems.

[0066] Then, the top support must be fully supported on the beam slab to prevent uneven stress on the lattice column frame, which would affect the stability of the frame.

[0067] Then, the dimensions of the timber must meet the specifications, the height of the timber should be uniform, and the height difference between adjacent timbers should be less than 2mm. The ends of the timber should be supported by the beams or slabs; if the timber protrudes, it needs to be staggered and reinforced.

[0068] S4. Bottom template installation

[0069] First, the bottom formwork of the top beam and slab of the 10-lattice column-1 independent support system of the post-cast strip is made of 12mm thick plywood. The width of the bottom formwork of the beam is the same as the beam width, and the length is 600mm (which can be adjusted according to the actual situation); the width of the top beam formwork is 500mm (which can be adjusted according to the actual situation), and the length is 600mm (which can be adjusted according to the actual situation).

[0070] Then, the independent support system of the lattice column 1 of the post-pouring strip 10 is erected together with the formwork support system on both sides of the post-pouring strip 10. The formwork at the top of the lattice column 1 needs to be disconnected from the formwork at other beams and slabs, and the independent support system of the lattice column 1 of the post-pouring strip 10 is not connected to other formwork support systems.

[0071] Then, after the formwork is laid and passes inspection, and before pouring concrete, thoroughly clean the area and apply a high-efficiency, high-quality release agent. The use of waste engine oil is strictly prohibited. The release agent must not affect structural performance or decorative construction, and must not contaminate reinforcing bars or concrete joints.

[0072] Then, after the template is processed, its dimensions and panel thickness are checked, and the template joints and flatness are checked through trial assembly. Only after passing the inspection can it be used.

[0073] Then, after the template is installed, its plane position and elevation should be re-measured to ensure that there are no errors before proceeding to the next process.

[0074] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A post-cast strip independent support system for a modular lattice column, characterized in that, It includes multiple lattice columns, which are arranged along the post-cast strip and the edge line of the frame beam; Each of the lattice columns includes multiple interlocking structural units, which are arranged along the length of the lattice column.

2. The independent support system for the post-cast strip of the disc-locked combined lattice column according to claim 1, characterized in that, The plurality of said disc-lock structural units include a top disc-lock structural unit and a bottom disc-lock structural unit; The top disc-type structural unit includes an adjustable support, a screw, an adjusting nut, a vertical rod, and a horizontal rod; the vertical rod and the horizontal rod are vertically connected, the vertical rod is provided with an adjusting nut, and the adjusting nut is fitted with a screw, the top of the screw is provided with the adjustable support; wherein, the screw can extend or retract relative to the vertical rod; The bottom disc-type structural unit includes an adjustable base, in which a lead screw is inserted, and the lead screw is inserted into the adjustable support.

3. The independent support system for the post-cast strip of the disc-locked combined lattice column according to claim 2, characterized in that, At least one intermediate disc-lock structural unit is provided between the top disc-lock structural unit and the bottom disc-lock structural unit; At least one of the intermediate disc-type structural units includes a screw, an adjusting nut, a vertical rod, and a horizontal rod; the horizontal rod is perpendicular to the vertical rod, the vertical rod is provided with an adjusting nut, and the adjusting nut is fitted with a screw, which can extend or retract relative to the vertical rod.

4. The independent support system for the post-cast strip of the disc-locked combined lattice column according to claim 2, characterized in that, At least one intermediate disc-lock structural unit is provided between the top disc-lock structural unit and the bottom disc-lock structural unit; At least one of the intermediate disc snap-fit ​​structural units includes a vertical pole and a horizontal pole, wherein a disc is provided on the vertical pole and the horizontal pole is provided on the outer periphery of the disc; Along the circumference of the disk, a plurality of pin holes are provided on the disk; the end of the horizontal rod is provided with a connector, and the connector is provided with a through groove; the pin passes through the through groove and is inserted into the pin hole.

5. The independent support system for the post-cast strip of the disc-locked combined lattice column according to claim 1, characterized in that, A sweeping rod is installed at the bottom between adjacent lattice columns.

6. The independent support system for the post-cast strip of the disc-locked combined lattice column according to claim 1, characterized in that, The top of the lattice column is provided with a top beam, and the bottom of the top beam is provided with a bottom beam template and the bottom of the slab template.

7. The independent support system for the post-cast strip of the disc-locked combined lattice column according to claim 6, characterized in that, The top beam and the bottom template of the slab are made of plywood.

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