CN215829743U - Nailing bamboo wood-concrete combined board - Google Patents

Abstract

The utility model discloses a nailed bamboo-wood-concrete composite board, which comprises a nailed bamboo-wood board (1) at the lower part and a cast-in-place concrete layer (2) at the upper part; the method is characterized in that: the nailing bamboo wood board (1) is a plate-type member formed by the staggered arrangement of wood layer boards (3) and engineering bamboo layer boards (5) with grooves (4) and the combination of layer by layer driving connecting nails (6) along the wide surface; the method is characterized in that: an anti-pulling nail (7) is arranged in the groove (4) of the engineering bamboo laminate (5); the method is characterized in that: the number ratio of the wood layer plates (3) to the engineering bamboo layer plates (5) can be adjusted according to the requirement. Compared with the prior art, the utility model realizes the compounding of ' replacing wood with bamboo ' and ' bamboo, has high efficiency and reliability of the novel shear connector, excellent mechanical property of the composite floor slab, effectively overcomes the defects of the prior art, has outstanding technical advantages and has good application prospect in modern bamboo-wood structure buildings.

Description

Nailing bamboo wood-concrete combined board

Technical Field

The utility model relates to a bamboo-concrete composite board, belonging to the field of building structures in civil engineering.

Background

The main problem faced by present day construction is the environmental impact of traditional construction materials, represented by steel and cement, during production and construction. The bamboo-wood member and the bamboo-wood structure are made of natural renewable, carbon-storage and degradable bamboo-wood materials as structural materials, the traditional concrete structure and steel structure are replaced in a certain range, the greening degree of the building can be obviously improved, and the method is an important measure for realizing sustainable development of the building industry.

The engineering bamboo represented by integrated bamboo, recombined bamboo and bamboo skin plywood is processed by cutting, planing, splitting or defibering processes and the like by taking bamboo chips as basic materials, and then is overlaid and hot-pressed and glued according to a certain rule to prepare a board or a square board with a regular appearance, so that the defects of irregular appearance, uneven structure, large mechanical property fluctuation and the like of round bamboos are effectively overcome, and the engineering bamboo is already used as a structural material for green buildings.

Due to the limitation of hot pressing technology and equipment, the cross section size and length of the engineering bamboo board or square timber are limited at present, and the requirements on the cross section size and span of bending-resistant members such as beams, floor slabs and the like are difficult to meet. Therefore, the cold pressing process is generally required to perform secondary gluing to meet the design requirement of the section size and span of the component, which significantly increases the production cost of the component and reduces the production efficiency, and the use of a large amount of cold pressing adhesive may increase the release amount of volatile organic compounds in the component and increase indoor air pollution. Therefore, research and development of small-size engineering bamboo and secondary gluing-free bending-resistant components become a practical demand for development of modern bamboo structure buildings.

The laminated board nailed wood (NLT) is a board member formed by overlapping wood laminated boards along the broad surface, nailing the wood laminated boards along the broad surface at a certain interval, and laminating and splicing the wood laminated boards. NLT production is simple, and through along broadside nailing concatenation shaping, mutual overlap joint between the adjacent batten makes the board-like component of great breadth and span with the small-size lath, and the material utilization efficiency is high. The processing technology does not need to depend on large-scale equipment and adhesive, so the production efficiency is high. Based on the excellent mechanical property of the engineering bamboo, the engineering bamboo is compounded with wood to prepare a nailed bamboo board (NLBT for short), a novel bamboo-wood member is developed, the NLT mechanical property is improved, the dependence on imported wood is reduced, and the engineering bamboo has important engineering application value and good application prospect.

The main application object of the NLBT is a floor slab of a bamboo-wood structure house, in order to improve the mechanical property, the sound insulation and shock insulation performance and the fireproof performance of the floor slab, a concrete layer can be poured on the upper part of the NLBT, and the NLBT-concrete composite board is formed through a shear connector, wherein the form and the performance of the shear connector have important influence on the mechanical property and the construction performance of the composite board. Currently, in NLT-concrete composite slab systems, the shear connectors used are screws and toothed plates. In addition, researchers have proposed that wood-layer boards with the same height are arranged in a staggered manner in the height direction, or wood laths with different heights are used for nailing, so that longitudinal ribs are formed on the upper portion of the NLT board by utilizing the height difference, and after the concrete slab is poured, the longitudinal ribs and the cast-in-place concrete layer form an engagement action to transfer combined cross-section shear stress, so as to combine effects. However, these existing shear connection methods all have obvious defects. The screws belong to flexible connecting pieces, and the necessary combination effect can be formed only by arranging a large number of screws, so that the consumption of the screws is high, and the cost is relatively high; the toothed plate is relatively high in price, special equipment is required for installation, and the machining is complex; the combination mode of arranging the wooden strips in a staggered manner along the height direction is simple in construction, but reliable vertical uplift resistance measures are lacked between the NLT and the concrete, the shear stress of a combination interface is transferred only by means of the adhesive force of the wooden strips and the concrete, and the combination effect is not reliable. Based on this, the shear connection technology of the current NLT-concrete composite board is directly applied to the NLBT-concrete composite board, the technical defects of the NLBT-concrete composite board cannot be overcome, and a new solution must be provided.

Disclosure of Invention

The utility model aims to provide a nailed bamboo-wood-concrete composite board (NLBT-concrete composite board for short), which has the advantages of reliable combination effect, high processing efficiency, good mechanical property, convenient construction and the like.

The technical scheme of the utility model is as follows: a kind of nailing bamboo wood-concrete composite board, including nailing the bamboo plank (1) and upper cast-in-place concrete layer (2) in the lower part; the method is characterized in that: the nailing bamboo wood board (1) is a plate-type member formed by the staggered arrangement of wood layer boards (3) and engineering bamboo layer boards (5) with grooves (4) and the combination of layer by layer driving connecting nails (6) along the wide surface; the method is characterized in that: an anti-pulling nail (7) is arranged in the groove (4) of the engineering bamboo laminate (5); the method is characterized in that: the number ratio of the wood layer plates (3) to the engineering bamboo layer plates (5) can be adjusted according to the requirement.

Compared with the existing NLT-concrete composite board, in the NLBT-concrete composite board, the engineering bamboo with excellent mechanical property is combined with low-grade wood, so that high-grade imported wood is effectively replaced, and the purpose of replacing wood with bamboo is realized. Moreover, compared with wood, the orthogonal engineering bamboo wood has bidirectional bamboo fibers, the longitudinal grain shear resistance performance is obviously superior to that of the wood, the groove arranged in the engineering bamboo layer is suitable to be used as a shear connector, and the groove connector is a typical rigid connector, so that a higher combination effect can be realized on the premise of obviously reducing the number of connectors, and the bending resistance performance of the whole NLBT-concrete composite board is obviously improved. Furthermore, the screw disposed in the groove may effectively resist vertical separation of the combined interface. In a comprehensive view, the NLBT-concrete composite slab provided by the utility model realizes the compounding of ' replacing wood with bamboo ' and ' bamboo, is efficient and reliable in novel shear connector, has excellent mechanical property of a composite floor slab, effectively overcomes the defects of the prior art, has outstanding technical advantages and has good application prospect in modern bamboo-wood structure buildings.

Drawings

FIG. 1 is a schematic illustration of nail bonding using unequal height plates;

FIG. 2 is a schematic view of nail bonding using a contoured plate;

FIG. 3 is a schematic view of a nailed bamboo wood panel using unequal height plies;

FIG. 4 is a schematic view of a nailed bamboo wood panel using a high-grade laminate;

fig. 5 is a schematic view of the nailed bamboo-wood-concrete composite board.

Description of the figures

1 is a nailed bamboo board 2, a cast-in-place concrete layer 3 and a wood board

4 is a groove 5, and an engineering bamboo layer plate 6 is a connecting nail

7 is an anti-pulling nail

Detailed Description

The utility model is shown in the attached drawing, and the nailed bamboo-wood-concrete composite board comprises a nailed bamboo-wood board (1) at the lower part and a cast-in-place concrete layer (2) at the upper part; the method is characterized in that: the nailing bamboo wood board (1) is a plate-type member formed by the staggered arrangement of wood layer boards (3) and engineering bamboo layer boards (5) with grooves (4) and the combination of layer by layer driving connecting nails (6) along the wide surface; the method is characterized in that: an anti-pulling nail (7) is arranged in the groove (4) of the engineering bamboo laminate (5); the method is characterized in that: the number ratio of the wood layer plates (3) to the engineering bamboo layer plates (5) can be adjusted according to the requirement. Engineering bamboo plywood (5), its characterized in that: the engineering bamboo is an orthogonal bamboo integrated material or an orthogonal bamboo skin plywood containing orthogonal bidirectional bamboo fibers.

When the method is implemented, firstly, the wood layer plate (3) and the engineering bamboo layer plate (5) are cut according to the designed specification, and a groove (4) is cut at the top of the engineering bamboo layer plate (5); then, arranging the wood layer plates (3) and the engineering bamboo layer plates (5) with the grooves (4) in a staggered manner, and driving connecting nails (6) layer by layer along the wide surface to form a plate-type member; next, screwing an anti-pulling nail (7) into the groove; and finally, casting a concrete layer (2) on the upper part of the nailed bamboo-wood board (1) in situ to form the nailed bamboo-concrete composite board, and finishing construction.

Claims (4)

1. A kind of nailing bamboo wood-concrete composite board, including nailing the bamboo plank (1) and upper cast-in-place concrete layer (2) in the lower part; the method is characterized in that: the nailing bamboo wood board (1) is a plate-type member formed by the staggered arrangement of wood layer boards (3) and engineering bamboo layer boards (5) with grooves (4) and the combination of layer by layer driving connecting nails (6) along the wide surface; an anti-pulling nail (7) is arranged in the groove (4) of the engineering bamboo laminate (5); the number ratio of the wood layer plates (3) to the engineering bamboo layer plates (5) can be adjusted according to the requirement.

2. The nailed bamboo-wood-concrete composite board of claim 1, characterized in that: the nailing bamboo wood board (1) is a plate type component formed by adopting equal-height wood layer boards (3) and engineering bamboo layer boards (5) to nail; and a plate-type component formed by nailing wood laminate plates (3) with different heights and engineering bamboo laminate plates (5).

3. The nailed bamboo-wood-concrete composite board of claim 1, characterized in that: the engineering bamboo laminated board (5) is characterized in that the engineering bamboo is an orthogonal bamboo integrated material or an orthogonal bamboo skin plywood containing orthogonal bidirectional bamboo fibers.

4. The nailed bamboo-wood-concrete composite board of claim 1, characterized in that: the connecting nail (6) and the anti-pulling nail (7) are common steel round nails, full-thread nails, half-thread nails, twist nails and wood nails or bamboo nails.

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