Support-free recyclable steel-wood composite truss laminated slab

Abstract

The utility model relates to a support-free recyclable steel-wood combined truss laminated slab. The laminated slab is composed of a prefabricated slab, in-slab steel bars, a steel-wood combined truss and a laminated layer. The prefabricated plate is located at the bottom, the in-plate steel bars and the steel-wood combined truss are sequentially arranged above the prefabricated plate, and the laminated layer is poured above the prefabricated plate. Lower chords and web members of the steel-wood combined truss are made of steel bars, upper chords are made of battens, and the bottom faces of the battens are higher than the top face of the concrete-poured laminated layer by a certain distance, so that disassembly is convenient. The bending resistance of the steel-wood combined section is utilized, an under-plate support is omitted, the leasing cost of the scaffold is saved, the wood beams can be repeatedly utilized, and remarkable economic and social benefits are achieved.

Description

Technical Field

[0001] This utility model relates to the field of structural design technology, and in particular to a support-free, recyclable steel-wood composite truss panel. Background Technology

[0002] With the rapid development of prefabricated buildings in my country, the prefabricated construction of horizontal components has become the mainstream choice. However, existing reinforced concrete truss floor slabs have many problems. The upper chord of the steel truss usually uses steel bars with a small diameter (generally 8mm), and the truss height is relatively short, resulting in weak bending stiffness of the section. During construction, supports (scaffolding) still need to be installed under the slab, which not only makes the construction site messy but also leads to high support rental costs, becoming a bottleneck for increasing the cost of prefabricated buildings and urgently needs to be solved. Utility Model Content

[0003] The present invention aims to provide a support-free, recyclable steel-wood composite truss slab to solve the problem that prefabricated floor decking in the prior art requires bottom support and has high cost.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A support-free, recyclable steel-wood composite truss panel.

[0006] This includes precast slabs, internal steel reinforcement, steel-wood composite trusses, and laminated layers, among which:

[0007] The precast slab is located at the bottom of the composite slab as a basic support structure. Its thickness is h1, and the top of the slab has a rough surface to enhance the adhesion to the composite layer.

[0008] The reinforcing bars are placed inside the precast slab, forming an integral whole with the precast slab, thereby increasing the strength of the precast slab;

[0009] The steel-wood composite truss consists of a top chord, a bottom chord, and web members. The bottom chord and web members are made of steel bars, while the top chord is made of timber.

[0010] The composite layer is poured on top of the precast slab at the construction site. Its thickness is h2. It is used to form an integral whole with the precast slab to constitute a complete floor slab structure.

[0011] In some specific embodiments, the thickness h1 of the precast slab is 60 mm, and the thickness h2 of the composite layer is 70 mm.

[0012] In some specific embodiments, the steel bars used for the lower chord and web members have a diameter of 8mm, and the timber used for the upper chord has a size of 50mm×50mm.

[0013] In some specific embodiments, the distance 'a' between the bottom surface of the timber and the top surface of the cast-in-place concrete composite layer is 50 mm.

[0014] In some specific embodiments, the upper chord of the steel-wood composite truss is a rectangular timber with a cross-sectional dimension of 50mm×50mm, and the lower chord and web members are all steel bars with a diameter of 8mm. The web members are fixed to the lower and upper chords by welding or binding.

[0015] In some specific embodiments, the precast slabs are fixed to the steel-wood composite truss through reserved holes and connectors. The connectors are steel bars or embedded parts, and the size of the reserved holes is adapted to the connectors.

[0016] In some specific embodiments, the composite layer is a reinforced concrete structure, which contains a steel mesh that is connected to the steel bars inside the precast slab. The steel mesh and the steel bars inside the slab are tied or welded to form an integral steel skeleton.

[0017] In some specific embodiments, steel-wood composite trusses are evenly arranged in the width direction of the composite slab, with a spacing of 300mm-500mm.

[0018] In some specific embodiments, the rough surface of the precast slab is a rough surface formed by mechanical scoring or chemical treatment, with a roughness ≥1.5mm.

[0019] In some specific embodiments, the two ends of the upper chord of the timber are provided with a connecting device that is easy to disassemble, and the connecting device is a snap-fit ​​or bolt connection structure.

[0020] The beneficial effects of this utility model are as follows: This utility model discloses a support-free, recyclable steel-wood composite truss slab, including a precast slab, internal steel reinforcement, a steel-wood composite truss, and a composite layer. The precast slab is located at the bottom of the composite slab, serving as a basic support structure, and has a thickness of h1. The top of the slab has a rough surface to enhance adhesion with the composite layer. The internal steel reinforcement is placed within the precast slab, forming an integral whole with it and increasing the slab's strength. The steel-wood composite truss consists of a top chord, a bottom chord, and web members, with the bottom chord and web members made of steel reinforcement and the top chord made of timber. The composite layer, with a thickness of h2, is cast on top of the precast slab at the construction site to form an integral whole with the precast slab, constituting a complete floor slab structure. The beneficial effects of this utility model are:

[0021] No support required: By innovatively utilizing the lever arm principle of structural mechanics, the bending resistance of the steel-wood composite section is fully utilized, eliminating the need for additional supports (scaffolding) during construction. This saves on scaffolding rental costs, simplifies construction procedures, improves construction efficiency, and makes the construction site cleaner and more orderly.

[0022] Recycling: Timber can be reused and used for formwork erection of other cast-in-place concrete components on the construction site, or transported back to the factory for secondary use, which reduces material costs, reduces the generation of construction waste, conforms to the concept of green and environmentally friendly construction, and has significant economic and social benefits.

[0023] Simple production process: The patented production process is simple, requiring only the use of existing traditional reinforced concrete steel truss floor decking production equipment, without the need for additional investment in new equipment, thus reducing the company's production costs and equipment investment, and making it easy to promote and apply. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a support-free, recyclable steel-wood composite truss panel structure according to this utility model.

[0025] In the attached diagram, 1. Precast slab; 2. Reinforcing steel bars within the slab; 3. Steel-timber composite truss; 31. Top chord; 32. Bottom chord; 33. Web member; 4. Composite layer; Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0027] Reference Figure 1 The illustrated supportless recyclable steel-wood composite truss slab includes a precast slab 1, internal steel reinforcement 2, a steel-wood composite truss 3, and a composite layer 4, wherein:

[0028] The precast slab 1 is located at the bottom of the composite slab and serves as a basic support structure. Its thickness is h1, and the top of the slab has a rough surface to enhance the adhesion to the composite layer.

[0029] The inner steel bar 2 is placed inside the precast slab, forming an integral whole with the precast slab, thereby increasing the strength of the precast slab;

[0030] The steel-wood composite truss consists of an upper chord 31, a lower chord 32, and web members 33. The lower chord 31 and web members 33 are made of steel bars, while the upper chord 31 is made of timber.

[0031] The positional relationships of the above structures are as follows:

[0032] The composite layer is poured on top of the precast slab 1 at the construction site. Its thickness is h2. It is used to form an integral whole with the precast slab 1 to form a complete floor slab structure.

[0033] The precast slab 1 is located at the bottom of the composite slab, and the internal steel bars 2 and the steel-wood composite truss 3 are arranged in sequence above it;

[0034] The lower chord 32 of the steel-wood composite truss 3 is connected to the precast slab 1, and the web members 33 connect the upper chord 31 and the lower chord 32 to form a stable truss structure.

[0035] The composite layer 4 is poured on top of the precast slab 1, covering the lower chord 32 and web members 33 of the steel-wood composite truss 3, but not covering the timber of the upper chord 31;

[0036] The upper chord 31 of the timber is located above the composite layer 4, and its bottom surface is a distance a above the top surface of the cast-in-place concrete composite layer 4, which facilitates the dismantling of the timber after construction.

[0037] The connection relationships of each structure are as follows:

[0038] The steel reinforcement 2 inside the slab is embedded in the precast slab 1, forming an integral structure with the precast slab 1;

[0039] The lower chord 32 of the steel-wood composite truss 3 is connected to the precast slab 1, and the web members 33 connect the upper chord 31 and the lower chord 32. They are fixed by welding or binding to form a stable truss structure.

[0040] The composite layer 4 is poured on the construction site and forms an integral whole with the precast slab 1, the lower chord 32 and the web members 33 of the steel-wood composite truss 3, thereby enhancing the integrity and strength of the floor slab.

[0041] In some specific embodiments, the thickness h1 of the precast slab is 60 mm, and the thickness h2 of the composite layer is 70 mm.

[0042] In some specific embodiments, the steel bars used for the lower chord and web members have a diameter of 8mm, and the timber used for the upper chord has a size of 50mm×50mm.

[0043] In some specific embodiments, the distance 'a' between the bottom surface of the timber and the top surface of the cast-in-place concrete composite layer is 50 mm.

[0044] In some specific embodiments, the upper chord of the steel-wood composite truss is a rectangular timber with a cross-sectional dimension of 50mm×50mm, and the lower chord and web members are all steel bars with a diameter of 8mm. The web members are fixed to the lower and upper chords by welding or binding.

[0045] In some specific embodiments, the precast slabs are fixed to the steel-wood composite truss through reserved holes and connectors. The connectors are steel bars or embedded parts, and the size of the reserved holes is adapted to the connectors.

[0046] In some specific embodiments, the composite layer is a reinforced concrete structure, which contains a steel mesh that is connected to the steel bars inside the precast slab. The steel mesh and the steel bars inside the slab are tied or welded to form an integral steel skeleton.

[0047] In some specific embodiments, steel-wood composite trusses are evenly arranged in the width direction of the composite slab, with a spacing of 300mm-500mm.

[0048] In some specific embodiments, the rough surface of the precast slab is a rough surface formed by mechanical scoring or chemical treatment, with a roughness ≥1.5mm.

[0049] In some specific embodiments, the two ends of the upper chord of the timber are provided with a connecting device that is easy to disassemble, and the connecting device is a snap-fit ​​or bolt connection structure.

[0050] Example 1

[0051] A support-free, recyclable steel-wood composite truss slab includes a precast slab 1, internal reinforcing bars 2, a steel-wood composite truss 3, and a composite layer 4. The precast slab 1 is 60mm thick and has a roughened top surface with a roughness ≥1.5mm. The internal reinforcing bars 2 are 8mm diameter steel bars, evenly distributed within the precast slab 1 to form a steel mesh. The upper chord 31 of the steel-wood composite truss 3 uses 50mm×50mm timber, while the lower chord 32 and web members 33 both use 8mm diameter steel bars. The bottom surface of the timber is 50mm above the top surface of the cast-in-place concrete composite layer 4, facilitating disassembly after construction. The steel-wood composite truss 3 is evenly distributed across the width of the composite slab at 400mm intervals. The composite layer 4 is 70mm thick and contains a steel mesh connected to the internal reinforcing bars 2 within the precast slab 1. The steel mesh and the internal reinforcing bars 2 are bound or welded together to form an integral steel reinforcement skeleton.

[0052] The precast slab 1 is fixed to the steel-wood composite truss 3 through pre-drilled holes and connectors. The connectors are steel bars or embedded parts, and the size of the pre-drilled holes is adapted to the connectors. The web members 33 of the steel-wood composite truss 3 are fixed to the lower chord 32 and the upper chord 31 by welding or binding to form a stable truss structure.

[0053] Example 2

[0054] In a prefabricated building project, the support-free, recyclable steel-wood composite truss panel of this utility model was used for construction. According to design requirements, the composite panel dimensions are 3000mm × 6000mm. The thickness of the precast panel 1 is 60mm, and the thickness of the composite layer 4 is 70mm. The upper chord 31 of the steel-wood composite truss 3 uses timber with a cross-sectional dimension of 50mm × 50mm, while the lower chord 32 and web members 33 both use steel bars with a diameter of 8mm. The bottom surface of the timber is 50mm above the top surface of the cast-in-place concrete composite layer 4, facilitating disassembly of the timber after construction. The steel-wood composite truss 3 is evenly distributed along the width of the composite panel at a spacing of 400mm.

[0055] The precast slab 1 is prefabricated in the factory, and its surface is roughened with a roughness ≥1.5mm. The reinforcing bars 2 inside the slab are 8mm diameter steel bars, which are evenly distributed inside the precast slab 1 to form a steel mesh. The steel-wood composite truss 3 is fabricated in the factory, and the two ends of the timber of its upper chord 31 are equipped with easy-to-disassemble connecting devices. The connecting devices are snap-fit ​​or bolt connection structures, which facilitate the quick disassembly and reuse of the timber.

[0056] At the construction site, precast slab 1 and steel-wood composite truss 3 are transported to the site for installation and fixation. Precast slab 1 and steel-wood composite truss 3 are fixedly connected through pre-drilled holes and connectors. Then, the composite layer 4 is poured. Concrete is poured on top of the precast slab 1 using concrete pouring equipment to form the composite layer 4. During the concrete pouring process, it is ensured that the composite layer 4 covers the lower chord 32 and web members 33 of the steel-wood composite truss 3, but does not cover the timber of the upper chord 31.

[0057] Once the concrete reaches its design strength, the timber can be dismantled. Since the bottom of the timber is 50mm above the top of the cast-in-place concrete composite layer 4, dismantling is easy, and the timber can be smoothly removed from the composite layer 4. The dismantled timber can be used for formwork erection of other cast-in-place concrete components on the construction site, or transported back to the factory for reuse, achieving timber recycling and reducing material costs.

[0058] The working principle of this utility model:

[0059] The core innovation of this utility model lies in the ingenious application of the lever arm principle in structural mechanics. By optimizing the design and layout of each structure, the bending resistance of the steel-wood composite section is fully utilized, thereby eliminating the need for additional under-slab supports during construction of the composite slab, while ensuring that the timber can be easily disassembled and recycled. The following is a detailed explanation of the working principle:

[0060] I. Bending Resistance Principle

[0061] Steel-wood composite trusses are key load-bearing components for composite slabs. The top chord is made of timber, while the bottom chord and web members are made of steel reinforcement. Under load, the steel-wood composite truss forms a stable triangular structure, effectively resisting bending moments. The compressive strength of the timber combined with the tensile strength of the steel reinforcement creates a highly efficient bending-resistant system. When the composite slab bears a load, the steel-wood composite truss can evenly distribute the load, reducing localized stress concentration and thus improving the overall load-bearing capacity of the composite slab.

[0062] II. Support-free principle

[0063] By increasing the truss height and using high-strength timber as the top chord, the bending stiffness of the cross-section was significantly improved. During construction, the composite slab itself has sufficient strength and stiffness to maintain its shape and bear construction loads, eliminating the need for additional under-slab supports, saving scaffolding rental costs, simplifying the construction process, improving efficiency, and making the construction site cleaner and more orderly.

[0064] III. Principle of Recycling

[0065] The top chord of the steel-wood composite truss is made of timber, with its bottom surface raised a certain distance (usually 50mm) above the top surface of the cast-in-place concrete composite layer, facilitating disassembly after construction. The timber can be reused for formwork erection of other cast-in-place concrete components on the construction site, or transported back to the factory for secondary processing, reducing material costs, minimizing construction waste, and conforming to the concept of green and environmentally friendly building.

[0066] IV. Principles of Collaborative Work

[0067] Precast slabs are prefabricated in the factory, ensuring controllable and stable quality. During the on-site pouring of the composite layer, the precast slabs serve as a base for support, and their rough surface enhances the adhesion between them and the composite layer, ensuring that both work together to form a unified floor slab. Steel-wood composite trusses connect and reinforce the precast slabs and the composite layer, with all construction stages working together to ensure the composite slab's load-bearing capacity and functionality.

[0068] V. Connection and Fixing Principles

[0069] Precast slabs are fixed to the steel-wood composite truss using pre-drilled holes and connectors. These connectors can be reinforcing bars or embedded parts, and the dimensions of the pre-drilled holes are adapted to the connectors. This connection method ensures a reliable connection between the precast slabs and the steel-wood composite truss, allowing them to work together during construction and share the load. The web members of the steel-wood composite truss are fixed to the lower and upper chords by welding or binding, forming a stable truss structure.

[0070] VI. The Principle of Holism

[0071] After the composite layer is poured, it forms an integral reinforced concrete structure with the precast slab and the lower chord and web members of the steel-wood composite truss. This integral design improves the load-bearing capacity and stiffness of the composite slab, enabling it to better resist various loads, while ensuring the overall performance and durability of the composite slab during use. The reinforcing mesh and the internal reinforcing bars of the slab are tied or welded to form an integral reinforcing skeleton, enhancing the load-bearing capacity and integrity of the composite layer.

[0072] In summary, this utility model, through ingenious design and structural optimization, realizes a support-free, recyclable steel-wood composite truss panel. This innovation not only reduces the cost increase of prefabricated buildings but also improves construction efficiency and on-site management, resulting in significant economic and social benefits.

[0073] By adopting the above-disclosed technical solution of this utility model, the following beneficial effects are obtained:

[0074] By applying the support-free, recyclable steel-wood composite truss panel of this invention, the construction project eliminates the need for additional supports (scaffolding) during construction, saving scaffolding rental costs, maintaining a clean and orderly construction site, and improving construction efficiency. Simultaneously, the recycling of timber reduces construction waste, aligning with green and environmentally friendly building principles, and achieving significant economic and social benefits.

[0075] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A support-free, recyclable steel-wood composite truss panel, characterized in that: It includes a precast slab (1), steel reinforcement (2), a steel-wood composite truss (3), and a composite layer (4), wherein: The precast slab (1) is located at the bottom of the composite slab as a basic support structure. Its thickness is h1. The top of the slab has a rough surface to enhance the adhesion to the composite layer. The steel reinforcement (2) inside the slab is set inside the precast slab (1) to form an integral whole with the precast slab (1) and increase the strength of the precast slab; The steel-wood composite truss (3) consists of an upper chord (31), a lower chord (32) and a web member (33), wherein the lower chord (32) and the web member (33) are made of steel bars, and the upper chord (31) is made of timber. The composite layer (4) is poured on top of the precast slab (1) at the construction site. Its thickness is h2. It is used to form an integral whole with the precast slab (1) to form a complete floor slab structure.

2. The support-free recyclable steel-wood composite truss panel according to claim 1, characterized in that: The thickness h1 of the precast slab (1) is 60 mm, and the thickness h2 of the composite layer (4) is 70 mm.

3. The support-free, recyclable steel-wood composite truss panel according to claim 1, characterized in that: The lower chord (32) and the web member (33) use steel bars with a diameter of 8mm, and the upper chord (31) uses timber with a size of 50mm×50mm.

4. The support-free, recyclable steel-wood composite truss panel according to claim 1, characterized in that: The distance a between the bottom surface of the timber and the top surface of the cast-in-place concrete composite layer (4) is 50mm.

5. The support-free, recyclable steel-wood composite truss panel according to claim 1, characterized in that: The upper chord (31) of the steel-wood composite truss (3) is a rectangular wooden block with a cross-sectional size of 50mm×50mm. The lower chord (32) and the web members (33) are both steel bars with a diameter of 8mm. The web members (33) are fixed to the lower chord (32) and the upper chord (31) by welding or binding.

6. The support-free, recyclable steel-wood composite truss panel according to claim 1, characterized in that: The precast slab (1) is fixed to the steel-wood composite truss (3) through reserved holes and connectors. The connectors are steel bars or embedded parts, and the size of the reserved holes is adapted to the connectors.

7. The unsupported, recyclable steel-wood composite truss panel according to claim 1, characterized in that: The composite layer (4) is a reinforced concrete structure, and it is provided with a steel mesh that is connected to the steel bars (2) inside the precast slab (1). The steel mesh and the steel bars (2) inside the slab are bound or welded to form an integral steel skeleton.

8. The unsupported, recyclable steel-wood composite truss panel according to claim 1, characterized in that: The steel-wood composite truss (3) is evenly arranged in the width direction of the composite plate with a spacing of 300mm-500mm.

9. The support-free, recyclable steel-wood composite truss panel according to claim 1, characterized in that: The rough surface of the precast slab (1) is a rough surface formed by mechanical scoring or chemical treatment, with a roughness ≥1.5mm.

10. The support-free recyclable steel-wood composite truss panel according to claim 1, characterized in that: The upper chord (31) is provided with connecting devices at both ends for easy disassembly. The connecting devices are snap-fit ​​or bolt connection structures.

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