A steel-reinforced glued-laminated timber / bamboo-concrete composite beam

Abstract

The present invention relates to a steel reinforced glued wood / bamboo-concrete composite beam, comprising: a glued wood / bamboo beam, a concrete slab and a reinforcement structure, wherein the reinforcement structure adopts two L-shaped steel plates, a U-shaped steel belt is arranged at the middle span of the L-shaped steel plate, the U-shaped steel belt connects the two L-shaped steel plates to form a reinforcement structure, a first connecting bolt is arranged on the net cross section of both limbs of the L-shaped steel plate, a second connecting bolt is arranged at the bottom position of the U-shaped steel belt, the glued wood / bamboo beam and the concrete slab are connected to the L-shaped steel plate through the first connecting bolt, and the U-shaped steel belt is connected to the bottom of the glued wood / bamboo beam through the second connecting bolt. The present invention adopts steel components for reinforcement, which can effectively limit the bending deformation of the wood / bamboo beam, delay the cracking of the wood / bamboo sheet bonding surface, increase the stiffness of the wood / bamboo-concrete bonding surface, and thus greatly improve the combination efficiency of the composite beam.

Description

Technical Field

[0001] The invention relates to the technical field of building structures, in particular to a steel-reinforced glued-laminated wood / bamboo-concrete composite beam. Background Art

[0002] The main problem facing today's construction is the environmental impact caused by the production and construction of traditional structural materials represented by steel and cement. In order to meet this challenge, my country has vigorously promoted green buildings represented by bamboo and wood structures, as well as the development of prefabricated buildings. Using bamboo and wood materials as structural materials can promote the development of green buildings.

[0003] Compared with traditional reinforced concrete, brick-concrete and steel structures, wooden structures have the advantages of good earthquake resistance, low energy consumption, environmental friendliness, simple construction, energy saving and heat preservation. my country has the richest bamboo forest resources in the world. The physical and mechanical properties of bamboo are similar to those of wood. It is also light, low-priced, tough, and has a wide range of sources. In particular, it has the advantages of a short maturity period. It is a more environmentally friendly material. At present, both glued wood and glued bamboo have been widely used in civil structures.

[0004] As a specific application form, the glued wood / bamboo-concrete composite beam is mainly bonded by glue. Once the sheets are torn or broken, the bending stiffness of the composite beam will be directly reduced. In addition, under the action of bending moment, the interface of the bonding layer between the glued wood / bamboo beam and the concrete slab has insufficient stiffness due to the deformation difference between the two materials, which is prone to slip. If these two interfaces are not reinforced, the combination efficiency of the composite beam will be greatly reduced, and there is no method or technology to solve or improve this problem. Summary of the invention

[0005] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a steel-reinforced glued-laminated timber / bamboo-concrete composite beam.

[0006] The present invention provides a steel-reinforced glued-laminated wood / bamboo-concrete composite beam, comprising: a glued-laminated wood / bamboo beam, a concrete slab and a reinforcement structure, wherein the reinforcement structure adopts two L-shaped steel plates, a U-shaped steel belt is arranged at the middle span of the L-shaped steel plate, and the U-shaped steel belt connects the two L-shaped steel plates to form the reinforcement structure, a first connecting bolt is arranged on the net cross section of both limbs of the L-shaped steel plate, a second connecting bolt is arranged at the bottom position of the U-shaped steel belt, and the glued-laminated wood / bamboo beam and the concrete slab are connected to the reinforcement structure through the first connecting bolt. The L-shaped steel plate is connected, the glued wood / bamboo beam and the concrete slab are connected to the L-shaped steel plate through the first connecting bolt to form an integral beam member, and the U-shaped steel belt is connected to the bottom of the glued wood / bamboo beam through the second connecting bolt; the second connecting bolt strengthens the connection strength between the U-shaped steel belt and the bottom of the glued wood / bamboo beam; the thickness of the L-shaped steel plate is in the range of 3 to 10 mm, the limb length of the L-shaped steel plate is in the range of 80 to 100 mm, the width of the U-shaped steel belt is in the range of 1 / 4 beam height to 1 / 3 beam height, and the clear distance between the U-shaped steel belts is in the range of 1 / 3 beam height to 1 / 2 beam height.

[0007] Preferably, the thickness of the U-shaped steel strip should be consistent with the thickness of the L-shaped steel plate.

[0008] Preferably, the U-shaped steel belt is arranged within the middle 1 / 3 span of the glued laminated timber / bamboo beam.

[0009] Preferably, the contact surfaces of the glued wood / bamboo beam, the concrete slab and the reinforcement structure are bonded by means of building structural adhesive.

[0010] Preferably, both the first connecting bolt and the second connecting bolt are high-strength bolts.

[0011] Preferably, the second connecting bolt avoids the glue layer of the glued wood / bamboo.

[0012] Preferably, the connection between the glued laminated timber / bamboo beam and the concrete slab is combined by cast-in-place or assembled by assembly.

[0013] Preferably, a post-cast strip is provided at the top of the concrete slab.

[0014] The beneficial effects of the present invention are as follows: 1. The present invention adopts steel components for reinforcement, which can effectively limit the bending deformation of wood / bamboo beams, delay the cracking of the bonding surface of wood / bamboo sheets, increase the stiffness of the wood / bamboo-concrete bonding surface, and thus greatly improve the combination efficiency of the composite beam. 2. The reinforcement structure and glued wood / bamboo beams adopted by the present invention are all prefabricated in the factory. After the factory processing, they are transported to the site for assembly, which greatly saves the on-site construction time compared with the traditional cast-in-place concrete beams. 3. The present invention enhances the connection strength between the U-shaped steel belt and the bottom of the glued wood / bamboo beam by arranging connecting bolts at the bottom of the U-shaped steel belt and the glued wood / bamboo beam, so as to more effectively exert the overall performance of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a bottom view schematic diagram of the overall structure after assembly of the present invention.

[0016] Figure 2 Schematic diagram of the reinforcement structure.

[0017] Figure 3 Schematic diagram of glulam / bamboo beam.

[0018] Figure 4 It is a top view schematic diagram of the overall structure after assembly of the present invention.

[0019] Description of reference numerals:

[0020] 1-reinforcement structure, 2-glulam / bamboo beam, 3-concrete slab, 41-first connecting bolt, 42-second connecting bolt, 5-L-shaped steel plate, 6-U-shaped steel strip, 7-concrete post-cast strip. DETAILED DESCRIPTION

[0021] In order to better understand the present invention, the present invention is further described below by way of examples, which are only used to explain the present invention and do not constitute any limitation to the present invention:

[0022] Example 1

[0023] like Figure 1-Figure 4As shown, this embodiment discloses a steel-reinforced glued laminated wood / bamboo-concrete composite beam, comprising: a glued laminated wood / bamboo beam 2, a concrete slab 3, a reinforcement structure 1, a first connecting bolt 41 and a second connecting bolt 42. The reinforcement structure 1 adopts two L-shaped steel plates 5, and a U-shaped steel belt 6 is arranged at the middle 1 / 3 span of the L-shaped steel plate 5. The U-shaped steel belt 6 connects the two L-shaped steel plates 5 to form the reinforcement structure 1. The first connecting bolt 41 is arranged on the net cross-section of both limbs of the L-shaped steel plate 5; the glued laminated wood / bamboo beam 2 and the concrete slab 3 are connected to the L-shaped steel plate 5 by the first connecting bolt 41 to form an integral beam member, and a second connecting bolt 42 is arranged at the bottom position of the U-shaped steel belt 6, and the second connecting bolt 42 connects the U-shaped steel belt 6 and the glued laminated wood / bamboo beam 2, and the second connecting bolt 42 strengthens the connection strength between the U-shaped steel belt 6 and the bottom of the glued laminated wood / bamboo beam 2.

[0024] In this embodiment, the glued wood / bamboo beam 2 and the concrete slab 3 are connected by assembly. The glued wood / bamboo beam 2 and the concrete slab 3 are connected to the reinforcement structure 1 by the first connecting bolt 41 and the second connecting bolt 42. The contact surface of the glued wood / bamboo beam 2, the concrete slab 3 and the reinforcement structure 1 is coated with building structural adhesive. The structural strength is further improved by the building structural adhesive. In order to ensure the structural strength, the first connecting bolt 41 and the second connecting bolt 42 can be high-strength bolts. The concrete slab 3 is a factory prefabricated concrete slab, and a post-cast strip 7 is provided at the top of the slab. By providing the post-cast strip 7, the top of the concrete slab can be ensured to be flat when the structure is put into use.

[0025] The thickness of the U-shaped steel belt in the reinforcement structure is consistent with the thickness of the L-shaped steel plate, which can be 5-10 mm. The limb length of the L-shaped steel plate is 80-100 mm, and 80 mm is selected in this embodiment. The width of the U-shaped steel belt is 1 / 4 beam height to 1 / 3 beam height, and 1 / 4 beam height is selected in this embodiment. The net distance between the U-shaped steel belts is 1 / 3 beam height to 1 / 2 beam height, and 1 / 3 beam height is selected in this embodiment.

[0026] During on-site assembly, high-strength bolts should avoid the gluing layer of glued wood / bamboo to achieve reliable force transmission; the number, diameter and spacing of high-strength bolts should be determined according to the force and meet the requirements of relevant specifications; the distance between bolt holes should be determined according to the specifications, and the hole diameter should be determined according to the project conditions and specifications.

[0027] Example 2

[0028] like Figure 1-Figure 4As shown, this embodiment also discloses a steel-reinforced glued laminated wood / bamboo-concrete composite beam, which is different from Example 1 in that the concrete slab of this embodiment is a cast-in-place concrete slab, and the connection between the glued laminated wood / bamboo beam and the concrete slab is combined in a cast-in-place manner. The thickness of the U-shaped steel belt in the reinforcement structure is consistent with the thickness of the L-shaped steel plate, which is 3-5 mm. In this embodiment, the limb length of the L-shaped steel plate is 100 mm, the width of the U-shaped steel belt is 1 / 3 of the beam height, and the net distance between the U-shaped steel belts is 1 / 2 of the beam height.

[0029] In the above-mentioned Example 2, for the steel-reinforced glued laminated timber / bamboo-concrete composite beam, the connection between the glued laminated timber / bamboo beam and the concrete slab is assembled in a cast-in-place manner, and the stiffness of the wood / bamboo-concrete joint surface is greater than that of the assembly method. Therefore, the thickness of the reinforced structural steel plate in Example 2 can be appropriately reduced compared with the thickness of the reinforced structural steel plate in Example 1.

[0030] Working principle:

[0031] During installation, the bonding surfaces of the concrete slab and the glued wood / bamboo beam and the reinforced structure are first treated with surface treatment, that is, the honeycombs, holes and depressions on the bonding surfaces of the concrete slab and the glued wood / bamboo beam are repaired with structural repair glue; then the bonding surfaces are roughened to improve the bonding strength.

[0032] Different roughness has different effects on bonding. Before applying adhesive, the bonding surface of the reinforcement structure should be derusted, roughened and flattened, and other parts should also be cleaned of impurities and dust. During the bonding process of the adhesive and the reinforcement structure, avoid the generation of bubbles.

[0033] After accurately positioning the reinforcement structure, concrete slab and glued wood / bamboo beam and gluing them with structural adhesive, install and fix the corresponding bolts from top to bottom, and then pour the post-cast strip of the concrete slab according to the project conditions and specifications.

[0034] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

[0035] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A steel-reinforced glued-laminated timber / bamboo-concrete composite beam, characterized in that: include: Glued wood / bamboo beam, concrete slab and reinforcement structure, the reinforcement structure adopts two L-shaped steel plates, a U-shaped steel belt is arranged at the middle span of the L-shaped steel plate, the U-shaped steel belt connects the two L-shaped steel plates to form the reinforcement structure, first connecting bolts are arranged on the net cross-section of both limbs of the L-shaped steel plate, a second connecting bolt is arranged at the bottom position of the U-shaped steel belt, the glued wood / bamboo beam and the concrete slab are connected to the L-shaped steel plate through the first connecting bolts, and the U-shaped steel belt is connected to the bottom of the glued wood / bamboo beam through the second connecting bolts; The thickness of the L-shaped steel plate is in the range of 3 to 10 mm, the length of the L-shaped steel plate is in the range of 80 to 100 mm, the width of the U-shaped steel strip is in the range of 1 / 4 to 1 / 3 of the beam height, and the clearance between the U-shaped steel strips is in the range of 1 / 3 to 1 / 2 of the beam height; The thickness of the U-shaped steel strip should be consistent with the thickness of the L-shaped steel plate; The U-shaped steel belt is arranged within the middle 1 / 3 span of the glued wood / bamboo beam; The contact surfaces of the glued wood / bamboo beam, the concrete slab and the reinforcement structure are bonded by using building structural adhesive; The first connecting bolt and the second connecting bolt are both high-strength bolts; The second connecting bolt avoids the glue layer of the glued wood / bamboo; The connection between the glued laminated wood / bamboo beam and the concrete slab is assembled by cast-in-place method or assembled by assembly method; A post-cast strip is arranged at the top of the concrete slab.

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