Novel prestressed thin-wall steel constraint square bamboo column

Abstract

The utility model discloses a novel prestress thin-wall steel constraint square bamboo column which comprises a thin-wall square steel tube with split bolt holes and a recombined square bamboo column, and a plurality of split bolt holes which are arranged at equal intervals are arranged on two sides of the recombined square bamboo column. The combination of the thin-wall square steel tube and the recombined square bamboo column is realized by applying active constraint confining pressure and mucilage glue to the internal square bamboo column, and the defects of low elasticity modulus, large influence of creep on mechanical properties, strength degradation, high possibility of cracks and other mechanical properties caused by independent use of bamboos are overcome. The current situation that an existing bamboo structure and an existing steel-bamboo combined structure are hindered from wide use due to the fact that raw bamboo material resources are reduced is improved, a layer of flame-retardant gypsum rock wool board is arranged between the protective layer bamboo plywood and the thin-wall square steel pipe, and the flammability of the internal square bamboo column under the fire disaster condition can be effectively improved; and the possibility of bearing capacity failure and overall structure collapse caused by bamboo column combustion under the fire disaster condition is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to building structure technical field especially relates to a novel prestressed thin-walled steel restraint square bamboo column. BACKGROUND

[0002] Due to the single building form, complex node and unreliable connection of the natural growth round bamboo, it is not suitable for the demand of modern building, and the material itself is uneven, easy to crack, anisotropic, easy to appear worm-eaten, rotten and mildew and other defects. For this reason, people gradually begin to use modern technology to process bamboo, and make relatively stable performance, regular shape of reconstituted bamboo, including bamboo plywood, bamboo laminated wood, glued bamboo beam, glued bamboo column and various bamboo-wood composite board and the like. But still can not avoid the low elastic modulus of bamboo itself, the mechanical properties are greatly affected by creep, strength degradation, easy to appear crack and other mechanical properties defects and low fire performance characteristics, limit its application and development, in view of the above problem, here provides a novel prestressed thin-walled steel restraint square bamboo column. SUMMARY

[0003] In order to make up for the above insufficient, the utility model provides a novel prestressed thin-walled steel restraint square bamboo column, aims at improving the low elastic modulus of bamboo itself, the mechanical properties are greatly affected by creep, strength degradation, easy to appear crack and other mechanical properties defects and low fire performance characteristics, and make up the shortcomings that thin-walled steel member is slender and thin and flexible, and is easy to appear overall / local instability.

[0004] In order to realize the above purpose, the utility model adopts the following technical scheme: a novel prestressed thin-walled steel restraint square bamboo column, including thin-walled square steel pipe with tension bolt hole and reconstituted square bamboo column, a plurality of equidistant tension bolt holes are formed on the both sides of the reconstituted square bamboo column, the reconstituted square bamboo column is installed with tension bolt at the corresponding tension bolt hole, and the reconstituted square bamboo column is built in the inside of the thin-walled square steel pipe.

[0005] As a further description of the above technical scheme:

[0006] The inner surface of the thin-walled square steel pipe and the outer surface of the reconstituted square bamboo column are brushed with epoxy resin adhesive.

[0007] As a further description of the above technical scheme:

[0008] The outer surface of the thin-walled square steel pipe is pasted with gypsum rock wool board through epoxy resin adhesive.

[0009] As a further description of the above technical scheme:

[0010] The outer surface of the gypsum rock wool board pasted on the outer surface of the thin-walled square steel pipe is pasted with protective layer bamboo plywood through epoxy resin adhesive.

[0011] As a further description of the above technical solutions:

[0012] The arc-shaped gasket is vertically arranged in the bolt hole of the pair of bolts.

[0013] As a further description of the above technical solutions:

[0014] The pair of bolt holes are arranged on the axial center lines of the two directions of the square bamboo column in a staggered manner with a 1 / 2 bolt spacing.

[0015] The internal square bamboo column and the external thin-walled square steel pipe are used to constrain the square bamboo column, and the axial deformation difference of 5-10 mm is reserved at the upper and lower ends in the height direction according to the different heights of the composite column, that is, the axial height of the internal square bamboo column is higher than that of the external thin-walled square steel pipe by 5-10 mm.

[0016] The utility model has the advantages of the following beneficial effects:

[0017] 1. In the utility model, the combination of the thin-walled square steel pipe and the reorganized square bamboo column solves the problem of insufficient overall structural performance caused by the low elastic modulus, the great influence of creep on mechanical properties, the strength degradation and the easy occurrence of cracks of the bamboo, and makes up for the shortcomings of the thin-walled steel member, such as being slender and thin and flexible, being prone to overall / local instability, and improves the current situation that the bamboo structure and the steel-bamboo composite structure are hindered from being widely used due to the reduction of original bamboo material resources.

[0018] 2. In the utility model, the thin-walled square steel pipe is arranged around the cross section, which is more conducive to greater bending resistance under eccentric force, and the pair of bolts can prevent the interface separation of the internal reorganized square bamboo column and the thin-walled square steel pipe and improve the shear resistance of the member under the action of horizontal load.

[0019] 3. In the utility model, the epoxy resin adhesive with high bonding strength and good durability is used between the thin-walled square steel pipe and the internal square bamboo column, which completely eliminates the gap between the internal square bamboo column and the external thin-walled square steel pipe, realizes the good bonding and seamless combination of the thin-walled square steel pipe and the internal square bamboo column, provides active constraint pressure for the internal square bamboo column through the pair of bolts, improves the compressive strength and bearing capacity of the internal square bamboo column, achieves the combination effect of 1+1≥2, changes the failure characteristics and morphology of the internal square bamboo column, and does not cause sudden compression-shear failure and vertical splitting failure of the internal square bamboo column, does not cause the failure model that the internal square bamboo column is damaged and the whole member is disabled, and significantly improves the ductility and toughness of the composite column, so that the composite column has more superior stress performance and seismic performance than other steel-bamboo composite columns.

[0020] 4. The utility model discloses a square bamboo column is placed in the square steel pipe, sets up a layer of fire -retardant gypsum rock wool board between the protective layer bamboo plywood and thin -walled square steel pipe, can effectively improve the combustibility of internal square bamboo column under the fire condition, reduced the possibility that square bamboo column combustion leads to bearing capacity failure and overall structure collapse under the fire condition. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A novel prestressed thin -walled steel square bamboo column of the utility model is shown in the schematic diagram;

[0022] Figure 2 The installation schematic diagram of a novel prestressed thin -walled steel square bamboo column of the utility model is shown in the schematic diagram;

[0023] Figure 3 The protective layer bamboo plywood of a novel prestressed thin -walled steel square bamboo column of the utility model is shown in the schematic diagram;

[0024] Figure 4 The gypsum rock wool board of a novel prestressed thin -walled steel square bamboo column of the utility model is shown in the schematic diagram;

[0025] Figure 5 The overall structure cut -section view of a novel prestressed thin -walled steel square bamboo column of the utility model is shown in the schematic diagram;

[0026] Figure 6 The overall structure installation separation diagram of a novel prestressed thin -walled steel square bamboo column of the utility model is shown in the schematic diagram;

[0027] Legend:

[0028] 1, thin -walled square steel pipe;2, reconstituted square bamboo column;3, tension bolt;4, gypsum rock wool board;5, protective layer bamboo plywood;6, epoxy resin adhesive;7, arc -shaped spacer. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0030] Reference Figures 1-6The utility model provides an embodiment: a novel prestressed thin -walled steel restrained square bamboo column, including thin -walled square steel pipe 1 with the bolt hole of opposite pull and reorganization square bamboo column 2, reorganization square bamboo column 2 two sides are provided with a plurality of equidistance bolt hole of opposite pull, and reorganization square bamboo column 2 is installed with opposite pull bolt 3 at the bolt hole of opposite pull, and reorganization square bamboo column 2 is embedded in the inside of thin -walled square steel pipe 1,

[0031] The inner surface of the thin-walled square steel pipe 1 and the outer surface of the reorganization square bamboo column 2 are coated with epoxy resin adhesive 6.

[0032] The outer surface of the thin-walled square steel pipe 1 is pasted with gypsum rock wool board 4 through the epoxy resin adhesive 6.

[0033] The outer surface of the gypsum rock wool board 4 pasted on the outer surface of the thin-walled square steel pipe 1 is pasted with a protective layer of bamboo plywood 5 through the epoxy resin adhesive 6.

[0034] The arc-shaped gasket 7 is installed in the vertical direction of the bolt hole of the opposite pull bolt 3.

[0035] The bolt hole of opposite pull is opened in the axial center line of the two directions of the cross section of the reorganization square bamboo column 2 with a 1 / 2 bolt spacing, and the thin-walled square steel pipe 1 is provided with a bolt hole reserved hole with the same bolt spacing as the reorganization square bamboo column 2.

[0036] The internal reorganization square bamboo column 2 and the external thin-walled square steel pipe 1 of the thin-walled square steel pipe 1 restraining the reorganization square bamboo column 2, in the height direction, according to the different heights of the composite column, 5-10mm axial deformation difference is reserved in the upper and lower beam sections, that is, the axial height of the internal reorganization square bamboo column 2 is higher than that of the external thin-walled square steel pipe 1 by 5-10mm, so as to avoid the problem that the axial compression deformation is not coordinated due to the fact that the elastic modulus of the reorganization column material used by the square bamboo column is one order of magnitude lower than the elastic modulus of the steel material used by the thin-walled square steel pipe (the elastic modulus of the thin-walled steel is about 2.00x10 5 MPa, and the elastic modulus of the bamboo material is about 1.0x10 4 MPa), and the thin-walled square steel pipe easily appears local buckling or overall buckling instability under excessive pressure, and the axial compression bearing capacity of the thin-walled square steel pipe cannot be fully utilized.

[0037] Working principle: step one: according to the bearing capacity limit state and normal use limit state demand, the cross section size of the prestressed thin-walled square steel pipe 1 restraining the reorganization square bamboo column 2 is determined, the internal square bamboo column is made according to the reorganization square bamboo column 2 manufacturing process, the bolt hole reserved hole of the opposite pull bolt 3 is made with a bolt spacing / 2 staggered in the axial direction of the two directions of the cross section according to the bolt spacing size of the opposite pull bolt 3, and the arc-shaped groove is processed along the vertical direction of the bolt hole of the opposite pull bolt 3, forming the reorganization square bamboo column 2 with the bolt hole 3 and the arc-shaped groove.

[0038] Step two: according to the bearing capacity limit state and normal use limit state requirements, determine the thickness and cross section size of thin-walled square steel pipe 1, according to the cross section size requirement, make thin-walled square steel pipe 1 with arc groove, according to the spacing of tension bolt 3, in the axial direction along the cross section in two directions with the spacing of bolt / 2 staggered

[0039] Step three: according to the cross section structure requirement, process and make tension bolt arc gasket 7, the thickness of tension bolt arc gasket 7 can be selected as 2mm, 3mm or 4mm according to the requirement; at the same time, according to the spacing of tension bolt 3, punch on the tension bolt arc gasket to form arc gasket 3 with tension bolt hole.

[0040] Step four: according to the cross section size and the requirement of pre-stress exerted by tension bolt 3, purchase tension bolt 3 with certain diameter and length. According to the requirement of pre-stress exertion, the diameter can be selected as 6mm, 8mm, 10mm and 12mm, and the strength grade can be selected as 8.8 and 10.8 grade bolt. The length of bolt shall meet the requirement that 3mm ≤ the length of thread end protruding after exerting pre-stress on thin-walled square steel pipe 1 ≤ 6mm.

[0041] Step five: according to the interface bonding strength requirement, purchase epoxy resin adhesive 6, according to the requirement of epoxy resin AB adhesive instruction, calculate the required amount of adhesive for pasting reorganized square bamboo column 2 and thin-walled square steel pipe 1 with A agent and B agent mass ratio of 1:1, configure epoxy resin AB adhesive, and require stirring and uniformity.

[0042] Step six: evenly brush the uniform epoxy resin AB adhesive on the outer surface of reorganized square bamboo column 2 with tension bolt hole and arc groove and the inner surface of thin-walled square steel pipe 1 with tension bolt hole, and control the thickness of adhesive to be 0.5-1mm; then put the reorganized square bamboo column 2 with epoxy resin adhesive 6 into the thin-walled square steel pipe 1 with epoxy resin adhesive 3, and ensure the accurate positioning of tension bolt hole of thin-walled square steel pipe 1 and reorganized square bamboo column.

[0043] Step seven: after the thin-walled square steel pipe 1 with epoxy resin adhesive 3 and accurate positioning of tension bolt hole is assembled and the reorganized square bamboo column 2 is placed for about 1 hour, according to the structure requirement, assemble and install the prepared tension bolt arc gasket 7 and purchased tension bolt 3 on the corresponding position of reorganized square bamboo column 2 combined with thin-walled square steel pipe 1 with epoxy adhesive, and wait for the further solidification of epoxy resin adhesive 6.

[0044] Step eight: after the thin-walled square steel pipe 1 with the assembled pull bolt is reassembled in the square bamboo column 2, the epoxy resin adhesive 6 is cured for 48 hours to continue to maintain the strength, and the strength develops to 85% of the final strength, the initial prestress of the thin-walled square steel pipe 1 is applied according to the prestress degree of the prestressed thin-walled square steel pipe 1 restraining the reassembled square bamboo column 2. When the prestress is applied, considering the existing prestress loss, the torque size is greater than 10% according to the predetermined torque size, and the prestressed thin-walled square steel pipe 1 restraining the reassembled square bamboo column 2 is formed.

[0045] Step nine: according to the interface bonding strength requirement, the epoxy resin AB adhesive 5 is purchased, the epoxy resin AB adhesive is configured according to the requirement of the epoxy resin AB adhesive instruction, the adhesive quantity requirement of the fire-retardant gypsum rock wool board 4, the protective layer bamboo plywood 5 and the prestressed thin-walled square steel pipe 1 restraining the reassembled square bamboo column 2 is calculated according to the mass ratio of A agent and B agent of 1:1, and the epoxy resin AB adhesive is required to be stirred and mixed uniformly.

[0046] Step ten: according to the section and height size of the prestressed thin-walled square steel pipe 1 restraining the reassembled square bamboo column 2, the fire-retardant gypsum rock wool board 4 is made. Then the epoxy resin adhesive 6 is brushed on the inner side of the gypsum rock wool board 4 and the outer side of the prestressed thin-walled square steel pipe 1 restraining the reassembled square bamboo column 2, and then the gypsum rock wool board 4 is pasted on the outer side of the prestressed thin-walled square steel pipe 1 restraining the reassembled square bamboo column 2 to form a fire-retardant fireproof layer.

[0047] After the epoxy resin adhesive 6 is finally cured for 14 days, the prestressed thin-walled square steel pipe 1 restraining the reassembled square bamboo column 2 with the fire-retardant gypsum rock wool board 4 is finally formed.

[0048] Step eleven: according to the section and height size of the prestressed thin-walled square steel pipe 1 restraining the reassembled square bamboo column 2, the protective layer bamboo plywood 5 is made. The epoxy resin adhesive 6 is brushed on the inner side of the protective layer bamboo plywood 5 and the outer side of the prestressed thin-walled square steel pipe 1 restraining the reassembled square bamboo column 2 with the fire-retardant gypsum rock wool board 4, and then the protective layer bamboo plywood 5 is pasted on the outer side of the prestressed thin-walled square steel pipe 1 restraining the reassembled square bamboo column 2 with the fire-retardant gypsum rock wool board 4. After the epoxy resin adhesive 6 is finally cured for 14 days, the prestressed thin-walled square steel pipe 1 restraining the reassembled square bamboo column 2 with the protective layer bamboo plywood 6 is finally formed.

[0049] Finally, it should be pointed out that the above-mentioned is only the preferred embodiment of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A new type of prestressed thin-walled square bamboo column with square steel tube, comprising a thin-walled square steel tube (1) with a pair of bolt holes and a reorganized square bamboo column (2), characterized in that: The reorganization square bamboo column (2) is provided with a plurality of equidistant bolt holes on both sides, the reorganization square bamboo column (2) is provided with a bolt (3) corresponding to the bolt hole, and the reorganization square bamboo column (2) is arranged in the thin-walled square steel pipe (1).

2. A new type of prestressed thin-walled steel confined square bamboo column according to claim 1, characterized in that: The inner surface of the thin-walled square steel pipe (1) and the outer surface of the reorganization square bamboo column (2) are coated with epoxy resin adhesive (6).

3. The new type of prestressed thin-walled square bamboo column constrained by steel according to claim 1, characterized in that: The outer surface of the thin-walled square steel pipe (1) is pasted with gypsum rock wool board (4) through epoxy resin adhesive (6).

4. The new type prestressed thin-walled square bamboo column confined by steel according to claim 3, characterized in that: The outer surface of the gypsum rock wool board (4) pasted on the outer surface of the thin-walled square steel pipe (1) is pasted with a protective layer of bamboo plywood (5) through epoxy resin adhesive (6).

5. The new type of prestressed thin-walled square bamboo column confined by steel according to claim 1, characterized in that: The arc-shaped gasket (7) is vertically arranged on the bolt hole of the bolt (3).

6. A new type of prestressed thin-walled square bamboo column confined by steel according to claim 1, characterized in that: The reorganization square bamboo column (2) is provided with bolt holes on the axis of the two directions of the cross section with a 1 / 2 bolt spacing staggered, and the thin-walled square steel pipe (1) is provided with bolt holes with the same bolt spacing as the reorganization square bamboo column (2).

7. A new type of prestressed thin-walled square bamboo column confined by steel according to claim 1, characterized in that: The internal reorganization square bamboo column (2) and the external thin-walled square steel pipe (1) of the reorganization square bamboo column (2) are arranged in the height direction according to the different heights of the combined column, and 5-10mm axial deformation difference is reserved at the upper and lower ends, that is, the axial height of the internal reorganization square bamboo column (2) is higher than that of the external thin-walled square steel pipe (1) by 5-10mm.

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