A box-type bamboo-concrete composite beam

Abstract

The present invention discloses a box-type bamboo-concrete composite beam, comprising two vertically arranged and mutually parallel bamboo webs, a concrete top plate fixed to the top of the two bamboo webs, and a bamboo bottom plate fixed to the bottom of the two bamboo webs. The box-type composite beam of the present invention greatly improves the cross-sectional bending rigidity of the beam body, and gives full play to the excellent mechanical properties of concrete and bamboo. Concrete is compressed and bamboo is pulled, and the advantages of the two complement each other, with the characteristics of high bearing capacity and high rigidity. The box-type structure has better anti-overturning performance and stability. The angle steel connection can effectively avoid the problem of debonding failure between bamboo boards due to excessive slippage of the bamboo webs. All components are prefabricated components, which can realize assembly-type rapid construction and dismantling and reinstallation for reuse.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, in particular to a box-type bamboo-concrete composite beam. Background Art

[0002] Bamboo has good mechanical properties, is green and environmentally friendly, and grows fast. my country is rich in raw bamboo resources. The use of bamboo can effectively alleviate the current tight supply of wood in my country. Bamboo engineering materials made of bamboo as raw materials have begun to be accepted by people as a new type of material and have been used in people's daily lives and in many aspects such as construction. Among them, bamboo-concrete composite beams have become a very attractive structural system because they can make bamboo and concrete work together. Bamboo-concrete composite beams are a type of bending member construction with large bearing capacity and stiffness. The upper part of the cross section is concrete material with good compressive strength, and the lower part of the cross section is engineering bamboo with good tensile strength. The two parts are connected by connectors to form a whole, so that the two materials can exert their respective best mechanical properties.

[0003] The existing bamboo-concrete composite beam structure is mostly T-shaped. For example, Chinese patent CN108316556A discloses a lightweight concrete-bamboo integrated material T-beam, in which the concrete is located at the top of the T-beam to bear shear stress, the upper flange is located at the upper part of the box beam, and the lower flange is located at the lower part of the box beam to bear tensile stress; Chinese patent CN205688659U discloses a bamboo-concrete composite beam with a continuous connector, in which a long reserved seam is arranged along the length direction of the bamboo beam, the perforated metal plate is equal to the bamboo beam, and the surface thereof is provided with a roughening structure, the bamboo beam and the cast-in-place concrete layer are connected through the perforated metal plate, and the adhesive fills the reserved seam and the lower hole of the bamboo beam. The existing bamboo-concrete composite beam structure is single, mainly T-beam, and the T-beam has poor anti-overturning performance and is not easy to place during installation. In addition, the manufacturing methods of the above two composite beams are relatively complicated, both of which are wet operations, and adhesives need to be poured at the connector to fix the bamboo and concrete, and then they can be formed after static curing, and the requirements for temperature and humidity are high. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a box-type bamboo-concrete composite beam, which greatly improves the cross-sectional bending stiffness, anti-overturning performance and stability of the beam body through a box-type structure composed of two bamboo webs, a concrete top plate and a bamboo bottom plate.

[0005] The technical solution of the present invention is:

[0006] A box-type bamboo-concrete composite beam comprises two vertically arranged and mutually parallel bamboo webs, a concrete top plate fixed to the top ends of the two bamboo webs, and a bamboo bottom plate fixed to the bottom ends of the two bamboo webs, wherein the axes of the two bamboo webs, the concrete top plate and the bamboo bottom plate are parallel to each other, and the distance between the outer vertical surfaces of the two bamboo webs is smaller than the width of both the concrete top plate and the width of the bamboo bottom plate; a row of angle steels uniformly distributed along the axial direction is arranged on the inner vertical surface and the outer vertical surface of each bamboo web and adjacent to the top and bottom ends thereof, and the two rows of angle steels adjacent to the top ends of the bamboo webs correspond one to one along the axial direction of the bamboo webs, the two rows of angle steels adjacent to the bottom ends of the bamboo webs correspond one to one along the axial direction of the bamboo webs, the upper and lower rows of angle steels arranged on the inner vertical surface of the bamboo webs correspond one to one up and down, and the upper and lower rows of angle steels arranged on the outer vertical surface of the bamboo webs correspond one to one up and down. Correspondingly, the vertical parts of the two rows of angle steels adjacent to the top of the bamboo web are respectively tightly attached to the inner vertical surface and the outer vertical surface of the bamboo web, and the vertical parts of the corresponding two angle steels are locked and connected by the tension pins that horizontally penetrate the bamboo web, the horizontal parts of the two rows of angle steels adjacent to the top of the bamboo web are both in contact with the lower end surface of the concrete top plate, and the horizontal part of each angle steel is locked and connected between the concrete top plate and the horizontal part of the angle steel by the corresponding tension pins, the vertical parts of the two rows of angle steels adjacent to the bottom end of the bamboo web are respectively tightly attached to the inner vertical surface and the outer vertical surface of the bamboo web, and the vertical parts of the corresponding two angle steels are locked and connected by the tension pins that horizontally penetrate the bamboo web, the horizontal parts of the two rows of angle steels adjacent to the bottom end of the bamboo web are both in contact with the upper end surface of the bamboo bottom plate, and the horizontal part of each angle steel is locked and connected between the bamboo bottom plate and the horizontal part of the angle steel by the corresponding tension pins.

[0007] The concrete top plate is provided with two rows of upper through bolt holes which are evenly distributed along the axial direction, each bamboo web is provided with a row of middle through bolt holes which are passed through from top to bottom along the axial direction, and the bamboo bottom plate is provided with two rows of lower through bolt holes which are evenly distributed along the axial direction, and each row of upper through bolt holes corresponds one by one to a corresponding row of middle through bolt holes and a corresponding row of lower through bolt holes, and each through bolt passes through the corresponding upper through bolt hole, middle through bolt hole and lower through bolt hole in sequence from top to bottom, and is then locked by a locking nut to realize the fixed connection between the concrete top plate, the two bamboo webs and the bamboo bottom plate.

[0008] The positions of the angle steels connected to the two bamboo webs are exactly the same.

[0009] The angle steel and the through bolts are arranged in an interval structure along the axial direction of the bamboo web.

[0010] The concrete top plate and the bamboo bottom plate overlap each other up and down.

[0011] The upper through bolt hole, the middle through bolt hole and the lower through bolt hole are equipped with bushings that penetrate the upper through bolt hole, the middle through bolt hole and the lower through bolt hole. The tension bolt holes on the bamboo web, the concrete top plate and the bamboo bottom plate for the tension pins to pass through are all equipped with bushings that penetrate the tension bolt holes. The through bolts or tension pins pass through the corresponding bushings.

[0012] The bamboo belly plate and the bamboo bottom plate are selected from one of bamboo laminated wood board, bamboo plywood, bamboo integrated board and reconstituted bamboo board.

[0013] Advantages of the present invention:

[0014] (1) Compared with traditional concrete beams or bamboo beams, the box-type composite beam structure of the present invention greatly improves the cross-sectional bending rigidity of the beam body, giving full play to the excellent properties of concrete and bamboo. Concrete is under compression and bamboo is under tension. The advantages of the two complement each other, and the beam has the characteristics of high bearing capacity and high rigidity.

[0015] (2) Compared with the traditional T-shaped bamboo-concrete composite beam, the utility model has better anti-overturning performance and stability, and the angle steel connection can effectively avoid the problem of debonding failure between bamboo boards due to excessive slippage of the bamboo web.

[0016] (3) The mechanical connection of the angle steel and the tie pins used in the present invention is a dry operation, which is easy to install and disassemble and is suitable for standardized factory production and on-site prefabrication and assembly operations, greatly improving the construction efficiency. Bushings are provided on the inner walls of the tie bolt holes and the through bolt holes, which can not only prevent the concrete and bamboo from being damaged due to local stress concentration, but also extend the service life of the box-type bamboo-concrete composite beam after repeated installation.

[0017] (4) The provision of through bolts in the present invention strengthens the vertical connection between the concrete top plate, the bamboo web and the bamboo bottom plate, making the structure more integral and better promoting the coordinated work of the three when under pressure.

[0018] (5) The web and bottom plates of the present invention are both made of bamboo, which is an ecological and environmentally friendly material with a fast growth rate, alleviating the shortage of steel and wood resources. While reducing the deadweight of the structure, it can also improve the bearing capacity and deformation capacity of the structure. In addition, the production process consumes little energy and causes little pollution, meeting the requirements of sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the present invention.

[0020] Figure 2 It is a cross-sectional schematic diagram of the present invention. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See Figure 1 and Figure 2 A box-type bamboo-concrete composite beam comprises two vertically arranged and mutually parallel bamboo webs 2, a concrete top plate 1 fixed to the top ends of the two bamboo webs 2, and a bamboo bottom plate 3 fixed to the bottom ends of the two bamboo webs 2, wherein the axes of the two bamboo webs 2, the concrete top plate 1 and the bamboo bottom plate 3 are mutually parallel, the concrete top plate 1 and the bamboo bottom plate 3 overlap each other up and down, and the distance between the outer vertical surfaces of the two bamboo webs 2 is less than the width of the concrete top plate 1 and the bamboo bottom plate 3;

[0023] A row of angle steels 4 evenly distributed along the axial direction is arranged on the inner vertical surface and the outer vertical surface of each bamboo web 2 and adjacent to its top and bottom ends, and the two rows of angle steels 4 adjacent to the top end of the bamboo web 2 correspond one-to-one along the axial direction of the bamboo web 2, and the two rows of angle steels 4 adjacent to the bottom end of the bamboo web 2 correspond one-to-one along the axial direction of the bamboo web 2, and the upper and lower rows of angle steels 4 arranged on the inner vertical surface of the bamboo web 2 correspond one-to-one up and down, and the upper and lower rows of angle steels 4 arranged on the outer vertical surface of the bamboo web 2 correspond one-to-one up and down, and the positions of the angle steels 4 connected on the two bamboo webs 2 are exactly the same; the vertical parts of the two rows of angle steels 4 adjacent to the top end of the bamboo web 2 are respectively close to the inner vertical surface and the outer vertical surface of the bamboo web 2, and the vertical parts of the corresponding two angle steels 4 pass through the horizontal bamboo The web is locked by the tension pins 5, the horizontal parts of the two rows of angle steels 4 adjacent to the top of the bamboo web 2 are in contact with the lower end surface of the concrete top plate 1, and the horizontal part of each angle steel 4 is locked and connected with the horizontal part of the concrete top plate 1 and the angle steel 4 through the corresponding tension pins 5, the vertical parts of the two rows of angle steels 4 adjacent to the bottom of the bamboo web 2 are respectively tightly attached to the inner vertical surface and the outer vertical surface of the bamboo web 2, and the vertical parts of the corresponding two angle steels 4 are locked and connected by the tension pins 5 horizontally penetrating the bamboo web 2, the horizontal parts of the two rows of angle steels 4 adjacent to the bottom of the bamboo web 2 are in contact with the upper end surface of the bamboo bottom plate 3, and the horizontal part of each angle steel 4 is locked and connected with the horizontal part of the bamboo bottom plate 3 and the angle steel 4 through the corresponding tension pins 5;

[0024] The concrete top plate 1 is provided with two rows of upper through bolt holes 61 which are evenly distributed along the axial direction, each bamboo web 2 is provided with a row of middle through bolt holes 62 which penetrate from top to bottom along the axial direction, and the bamboo bottom plate 3 is provided with two rows of lower through bolt holes 63 which are evenly distributed along the axial direction. Each row of upper through bolt holes 61 corresponds to a corresponding row of middle through bolt holes 62 and a row of lower through bolt holes 63 one by one. Each through bolt 6 passes through the corresponding upper through bolt hole 61, middle through bolt hole 62 and lower through bolt hole 63 from top to bottom in sequence, and then is locked by a locking nut to realize the fixed connection between the concrete top plate 1, the two bamboo webs 2 and the bamboo bottom plate 3.

[0025] Among them, the angle steel 4 and the through bolt 6 are arranged in an interval structure along the axial direction of the bamboo web 2; the upper through bolt hole 61, the middle through bolt hole 62 and the lower through bolt hole 63 are equipped with bushings 7 penetrating the upper through bolt hole 61, the middle through bolt hole 62 and the lower through bolt hole 63; the tension bolt holes 51 for the tension pins 5 to pass through on the bamboo web 2, the concrete top plate 1 and the bamboo bottom plate 3 are all equipped with bushings 7 penetrating the tension bolt holes 51, and the through bolts 6 or the tension pins 5 pass through the corresponding bushings 7; the bamboo web 2 and the bamboo bottom plate 3 are selected from one of bamboo laminated timber board, bamboo plywood, bamboo integrated board and reconstituted bamboo board.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A box-type bamboo-concrete composite beam, characterized in that: The invention comprises two vertically arranged and mutually parallel bamboo webs, a concrete top plate fixed to the top ends of the two bamboo webs, and a bamboo bottom plate fixed to the bottom ends of the two bamboo webs, wherein the axes of the two bamboo webs, the concrete top plate and the bamboo bottom plate are parallel to each other, and the distance between the outer vertical surfaces of the two bamboo webs is smaller than the width of the concrete top plate and the width of the bamboo bottom plate; a row of angle steels uniformly distributed along the axial direction is arranged on the inner vertical surface and the outer vertical surface of each bamboo web and adjacent to the top and the bottom ends thereof, and the two rows of angle steels adjacent to the top ends of the bamboo webs correspond one to one along the axial direction of the bamboo webs, the two rows of angle steels adjacent to the bottom ends of the bamboo webs correspond one to one along the axial direction of the bamboo webs, the upper and lower rows of angle steels arranged on the inner vertical surface of the bamboo webs correspond one to one up and down, the upper and lower rows of angle steels arranged on the outer vertical surface of the bamboo webs correspond one to one up and down, and the adjacent bamboo The vertical parts of the two rows of angle steels at the top of the web are respectively closely attached to the inner vertical surface and the outer vertical surface of the bamboo web, and the vertical parts of the corresponding two angle steels are locked and connected by the tie pins that horizontally penetrate the bamboo web, the horizontal parts of the two rows of angle steels adjacent to the top of the bamboo web are both in contact with the lower end surface of the concrete top plate, and the horizontal part of each angle steel is locked and connected with the horizontal part of the concrete top plate and the angle steel by the corresponding tie pins, the vertical parts of the two rows of angle steels adjacent to the bottom end of the bamboo web are respectively closely attached to the inner vertical surface and the outer vertical surface of the bamboo web, and the vertical parts of the corresponding two angle steels are locked and connected by the tie pins that horizontally penetrate the bamboo web, the horizontal parts of the two rows of angle steels adjacent to the bottom end of the bamboo web are both in contact with the upper end surface of the bamboo bottom plate, and the horizontal part of each angle steel is locked and connected with the horizontal part of the bamboo bottom plate and the angle steel by the corresponding tie pins; The concrete top plate is provided with two rows of upper through bolt holes evenly distributed along the axial direction, each bamboo web is provided with a row of middle through bolt holes penetrating from top to bottom along the axial direction, and the bamboo bottom plate is provided with two rows of lower through bolt holes evenly distributed along the axial direction, and each row of upper through bolt holes corresponds to a corresponding row of middle through bolt holes and a row of lower through bolt holes one by one, and each through bolt passes through the corresponding upper through bolt hole, middle through bolt hole and lower through bolt hole from top to bottom in sequence, and then is locked by a locking nut to realize the fixed connection between the concrete top plate, the two bamboo webs and the bamboo bottom plate; The positions of the angle steels connected to the two bamboo webs are exactly the same.

2. A box-type bamboo-concrete composite beam according to claim 1, characterized in that: The angle steel and the through bolts are arranged in an interval structure along the axial direction of the bamboo web.

3. The box-type bamboo-concrete composite beam according to claim 1, characterized in that: The concrete top plate and the bamboo bottom plate overlap each other up and down.

4. The box-type bamboo-concrete composite beam according to claim 1, characterized in that: The upper through bolt hole, the middle through bolt hole and the lower through bolt hole are equipped with bushings that penetrate the upper through bolt hole, the middle through bolt hole and the lower through bolt hole. The tension bolt holes on the bamboo web, the concrete top plate and the bamboo bottom plate for the tension pins to pass through are all equipped with bushings that penetrate the tension bolt holes. The through bolts or tension pins pass through the corresponding bushings.

5. The box-type bamboo-concrete composite beam according to claim 1, characterized in that: The bamboo belly plate and the bamboo bottom plate are selected from one of bamboo laminated wood board, bamboo plywood, bamboo integrated board and reconstituted bamboo board.

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