CN106639156A - Wood-coated steel-steel and wood composite column - Google Patents
Wood-coated steel-steel and wood composite column Download PDFInfo
- Publication number
- CN106639156A CN106639156A CN201710096707.0A CN201710096707A CN106639156A CN 106639156 A CN106639156 A CN 106639156A CN 201710096707 A CN201710096707 A CN 201710096707A CN 106639156 A CN106639156 A CN 106639156A
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- Prior art keywords
- wood
- steel
- alloy layers
- baogang
- ternary alloy
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/36—Columns; Pillars; Struts of materials not covered by groups E04C3/32 or E04C3/34; of a combination of two or more materials
Abstract
The invention discloses a wood-coated steel-steel and wood composite column which comprises a square steel pipe. An upper wood plate and a lower wood plate are coated on the outside of the square steel pipe; the upper wood plate and the lower wood plate are connected with each other by fasteners or are adhered and connected with each other by adhesive. The wood-coated steel-steel and wood composite column has the advantages that wood for the wood-coated steel-steel and wood composite column is light, environmentally friendly, renewable and reusable and is high in strength, and energy can be saved by the wood; steel for the wood-coated steel-steel and wood composite column is light and isotropic and is high in strength, convenient to construct, uniform in texture and excellent in energy dissipation capacity, and construction can be industrialized by the aid of the steel; merits of the wood and the steel can be sufficiently utilized by steel and wood composite structures of the wood-coated steel-steel and wood composite column, the shortcomings of the wood and the steel can be overcome by the aid of the merits, energy can be saved, the wood-coated steel-steel and wood composite column is environmentally friendly, green buildings are excellent in seismic performance, and the like.
Description
Technical field
The invention belongs to wooden combination technique field, more particularly to a kind of wooden Baogang-steel and wood composite post.
Background technology
Steel and wood composite structure " --- it is accurately that one kind is named steel wood mixing for the definition of steel and wood composite structure has two kinds
Structure, this structure refers to traditional timber structure in combination with Modern Steel Structure, and the spandrel girder of building, post adopt steel construction, periphery
Maintenance and Accessory Members adopt timber structure, this version in same component in essence can not realize
The collaborative work of steel, wood.Another kind definition refers to that supporting part such as beam, post of structural system etc. are all using steel and wood
Material collectively constitutes the structural system of simultaneously collaborative work.Mode according to composition component can be divided into again：Integral type --- wood is closed with steel
It is integrated the basic building block of composition structure；Separate type --- wood separately constitutes basic building block (the steel wood purlin of structure with steel
Frame) two kinds.After 5.12 Wenchuan earthquakes in 2008, national revised《Seismic design provision in building code》To structural system,
Building element, the anti-seismic performance of construction material are put forward higher requirement.Green, environmental protection, energy-conservation, good anti-seismic performance are existing
For the developing direction of architectural structure system.From protection natural resources and the angle of global environment, advance to timber resources
Effectively utilizes, and realize meeting the idea of development of national sustainable development building in structure and the performance application of fire-fighting domain.
Research and development high-performance is based on this field of the composite component of timber, such as with steel or fiber reinforced wooden frame, timber and armored concrete
Structural system of the floor system of composition, wooden frame parcel armored concrete or reinforcing bar etc. is all in progress achieved with certain, but for
Timber is also little with the integrated component research of steel composition.
In sum, in prior art, the integrated component of timber and steel composition is lacked in earthquake-resistant structure material, and
Existing earthquake-resistant structure material fire protecting performance is poor, and stability is weak, non-refractory, corrosion-resistant.
The content of the invention
It is an object of the invention to provide a kind of wooden Baogang-steel and wood composite post, it is intended in solving current earthquake-resistant structure material
Lack the integrated component of timber and steel composition, and existing earthquake-resistant structure material fire protecting performance is poor, stability is weak, intolerant to
The problem of high temperature, corrosion-resistant.
The present invention is achieved in that a kind of wooden Baogang-steel and wood composite post, and the wooden Baogang-steel and wood composite post includes side
Steel pipe；Plank and lower plank are coated with outside the square steel tube；The upper plank and lower plank are connected or are passed through by fastener
Adhesive pastes connection；The square steel tube surface is coated with Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-
Mo-P ternary alloy layers；Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P tri- by mass percentage
The each element content of first alloy-layer is respectively：Ni5.13%-P0.015%, Ni 5.13%-W 9.32%-P0.018%,
Ni5.13%-Mo4%-P0.02%；The Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P tri-
The thickness of first alloy-layer is 0.05mm～0.1mm.
Plank protruding block is connected with the upper plank or lower plank；The plank protruding block both sides pass through respectively screw
It is fixed with glued board；The glued board of plank protruding block both sides is connected by bolt with outside built-in fitting；The glue of the bolt-through two
Plywood and built-in fitting.
Further, the length of the plank and a width of 200mm × 200mm or 300mm × 200mm or 300mm × 300mm.
Further, the thickness and the length of side of the square steel tube be 5mm × 65mm or 6mm × 100mm or 7mm × 100mm or 8mm ×
65mm。
Further, the square steel tube or for 100 × 65 × 5 rectangle steel, or for 100 × 65 × 6 rectangle steel, or be
100 × 65 × 8 rectangle steel.
Further, described adhesive is resorcinol.
Further, the coating of Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy layers
Method includes：
Activation square steel tube 120～150 seconds, clear water is rinsed, and then deionized water or distilled water are cleaned；
Plating induction 60～90 seconds under the 100 μ A～800 μ A functions of current；
Plated film：Square steel tube after induction is placed in vacuum magnetic-control sputtering equipment, it is 10 to control the indoor vacuum of sputtering-4
During magnitude, protective gas is filled to sputtering chamber, the flow indication for adjusting flowmeter to protective gas is 15sccm～20sccm；Work as magnetic
When the vacuum of control sputtering equipment is 1Pa～10Pa, opening d.c. sputtering general supply makes Ni-P binary alloy layers or Ni-W-P
Ternary alloy layer or Ni-Mo-P ternary alloy layers gradually build-up of luminance, slide valve is adjusted after build-up of luminance makes the gas circuit mouth of pumping diminish, and takes out
Gas is slack-off, and the vacuum for making magnetron sputtering apparatus is 0.85Pa～8Pa, controls power and is sputtered for 50W～100W, during sputtering
Between be 2S～10S；
Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy layers are coated with by what is obtained
Square steel tube vacuum be 0.05Torr～2Torr under conditions of heated, added with the speed of 8 DEG C/min～15 DEG C/min
Hot dip has the square steel tube of alloy-layer, then heats to 300 DEG C～900 DEG C and keeps 60min～100min at this temperature, that is, obtain
The square steel for being coated with Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy layers after must annealing
Pipe；It is standby；
Hot water, cold water are successively cleaned, and are dried；The insulation at a temperature of 500 DEG C carries out timeliness in 90 minutes～100 minutes to plated film
Process；Then obtain being coated with Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P tri- after Ageing Treatment
The square steel tube of first alloy-layer.
Further, activate square steel tube needed to carry out before 120～150 seconds：
Treating the square steel tube of coating carries out electrochemical deoiling 9 minutes～12 minutes, and then ultrasonic wave is cleaned 3 minutes～6 minutes,
Then clear water is rinsed；Chemical derusting 60 seconds～90 seconds again, clear water is rinsed.
Further, the protective gas is argon gas.
Another object of the present invention is to provide a kind of building using above-mentioned wooden Baogang-steel and wood composite post reparation ancient building
Build component.
Wooden Baogang-steel and wood composite post that the present invention is provided, timber has high-strength light, energy-conserving and environment-protective, renewable and repetition
The advantage for using, but have the shortcomings that anisotropy, component transmission pulling force need to be by other materials, fire protecting performance difference amounts；And steel
With high-strength light, easy construction, isotropism, uniform in material, with good energy-dissipating property and can realize building work
The advantages of industry, and stability is weak, non-refractory, corrosion-resistant are its shortcomings；The present invention can make full use of the above two
Plant the advantage of material, learn from other's strong points to offset one's weaknesses, both have environmental protection and energy saving, and with the green building of good anti-seismic performance.
The present invention adopts standard magnetically controlled sputter method sputtered alloy layers on square steel tube substrate, compares traditional coating side
Method, the present invention has higher specific surface area, can carry out mass and be applied in actual productive life to play safe anti-
The effect of shield.
The present invention plates the layer of Ni-P chemical deposits such as (or Ni-W-P, Ni-Mo-P) on existing ordinary carbon steel square steel tube,
The anti-wear performance for making has a significant raising, and enhances the corrosion resistance of square steel tube, greatly extends the use longevity of square steel tube
Life, so as to significantly reduce the use cost of square steel tube.Such as on the square steel tube at plating 0.05mm thick Ni-P plated films and Jing timeliness
After reason, the service life of square steel tube will extend 20～25 times under the same terms；During such as plating 0.07mm thick Ni-P plated films and Jing
After effect process, service life will extend 28～45 times under the same terms.If plating is covered with the Ni-W-P plated films or Ni- of same thickness
Mo-P plated films, the service life of square steel tube will also be increased substantially on the basis of Ni-P plated films.If being plated with 0.1mm thickness
Ni-P plated films simultaneously Jing after Ageing Treatment, before its life-span and plating 50～60 times will be extended.And fire resistance is also increased substantially.
Description of the drawings
Fig. 1 is wooden Baogang provided in an embodiment of the present invention-structural representation of the steel and wood composite post in using fastener；
Fig. 2 is wooden Baogang provided in an embodiment of the present invention-structural representation of the steel and wood composite post in using adhesive；
Fig. 3 is plank protruding block connection diagram provided in an embodiment of the present invention.
In figure：1st, square steel tube；2nd, upper plank；3rd, lower plank；4th, fastener；5th, plank protruding block；6th, glued board；7th, screw
Nail；8th, bolt；9th, built-in fitting.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein is not used to only to explain the present invention
Limit the present invention.
The application principle of the present invention is explained in detail below in conjunction with the accompanying drawings.
As shown in Figure 1 to Figure 3, wooden Baogang-steel and wood composite post provided in an embodiment of the present invention includes square steel tube；The square steel
Plank and lower plank are coated with outside pipe；The upper plank and lower plank are connected by fastener or are pasted by adhesive and connected
Connect.The square steel tube surface is coated with Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy three-partalloys
Layer；Each unit of Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy layers by mass percentage
Cellulose content is respectively：Ni5.13%-P0.015%, Ni 5.13%-W 9.32%-P0.018%, Ni5.13%-
Mo4%-P0.02%；The Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy layers
Thickness is 0.05mm～0.1mm.
Plank protruding block 5 is connected with the upper plank or lower plank；The plank protruding block both sides pass through respectively screw
Nail 7 is fixed with glued board 6；The glued board of plank protruding block both sides is connected by bolt 8 with outside built-in fitting 9；The bolt is passed through
Wear two glued boards and built-in fitting.
The length of the plank and a width of 200mm × 200mm or 300mm × 200mm or 300mm × 300mm.
The thickness and the length of side of the square steel tube is 5mm × 65mm or 6mm × 100mm or 7mm × 100mm or 8mm × 65mm.
The square steel tube or for 100 × 65 × 5 rectangle steel, or for 100 × 65 × 6 rectangle steel, or for 100 × 65 ×
8 rectangle steel.
Described adhesive is resorcinol.
The method of coating bag of Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy layers
Include：
Activation square steel tube 120～150 seconds, clear water is rinsed, and then deionized water or distilled water are cleaned；
Plating induction 60～90 seconds under the 100 μ A～800 μ A functions of current；
Plated film：Square steel tube after induction is placed in vacuum magnetic-control sputtering equipment, it is 10 to control the indoor vacuum of sputtering-4
During magnitude, protective gas is filled to sputtering chamber, the flow indication for adjusting flowmeter to protective gas is 15sccm～20sccm；Work as magnetic
When the vacuum of control sputtering equipment is 1Pa～10Pa, opening d.c. sputtering general supply makes Ni-P binary alloy layers or Ni-W-P
Ternary alloy layer or Ni-Mo-P ternary alloy layers gradually build-up of luminance, slide valve is adjusted after build-up of luminance makes the gas circuit mouth of pumping diminish, and takes out
Gas is slack-off, and the vacuum for making magnetron sputtering apparatus is 0.85Pa～8Pa, controls power and is sputtered for 50W～100W, during sputtering
Between be 2S～10S；
Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy layers are coated with by what is obtained
Square steel tube vacuum be 0.05Torr～2Torr under conditions of heated, added with the speed of 8 DEG C/min～15 DEG C/min
Hot dip has the square steel tube of alloy-layer, then heats to 300 DEG C～900 DEG C and keeps 60min～100min at this temperature, that is, obtain
The square steel for being coated with Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy layers after must annealing
Pipe；It is standby；
Hot water, cold water are successively cleaned, and are dried；The insulation at a temperature of 500 DEG C carries out timeliness in 90 minutes～100 minutes to plated film
Process；Then obtain being coated with Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P tri- after Ageing Treatment
The square steel tube of first alloy-layer.
Activation square steel tube needed to carry out before 120～150 seconds：
Treating the square steel tube of coating carries out electrochemical deoiling 9 minutes～12 minutes, and then ultrasonic wave is cleaned 3 minutes～6 minutes,
Then clear water is rinsed；Chemical derusting 60 seconds～90 seconds again, clear water is rinsed.
The protective gas is argon gas.
The application effect of the present invention is further described with reference to test.
Steel and wood composite structural elements performance is analyzed, the side mainly tested by mass computing software and test specimen
Formula is analyzed to the stress of this new structural systen component, deformation performance, inquires into rational section composition form, different materials
Collaborative work how is effectively ensured between material, and building element fire protection requirement can be met.
(peripheral wooden rule cun is right with internal steel dimensions change for the post member section form test of (1) two kind of different materials composition
The impact of test specimen performance.
A, vertical loading
Vertical load is delivered in integrated steel wood coupled column, observes loading process, and timber acts like inside in post
One of steel is buckling-restrained, also, the steel in post can bend when general 50% buckling stress is born alone.But,
Combined member does not have flexing in the axial compressive force, because timber is buckling-restrained as one, effectively increases the carrying of component
Ability.By test of many times, suitable material ratio is found, both met economic requirement, also meet bearing requirements.
B, horizontal addload
It is different as building structure all directions stress.During lateral vibrations, steel parts stress is not sent out
Raw flexing.Therefore, simulation seismic process in, the timber function in combined member also can be similar to one it is buckling-restrained, effectively carry
The carrying of high component.
(2) evaluation method by load test to the junction adhesive durability between component different materials.
Carry out a series of with regard to adhesive durability experiment, analyzed for different materials in component, and different positions
Put the evaluation method of place's junction adhesive durability.
(3) Fire Test of component
According to current building element fire-protection standard, the fire protecting performance component testing of component has been carried out.According to standard testing side
Method confirms component and 1 hour fire protecting performance of combustible material, the exposure simultaneously load of test member after less than 3 hours in fire,
It means that component can during testing bearing load, not again igniting, further burn or increase and burn temperature
Performance is lost after test.
Test result shows, the steel and wood composite component of steel is inserted, after carrying out component normalized construction, with flame resistance
Attribute.Can burn when being exposed in fire, but after putting out, burn degree and no longer deteriorate.After fire test, component can be carried simultaneously
And the stress for using is less than flexion limit.
The present invention adopts standard magnetically controlled sputter method sputtered alloy layers on square steel tube substrate, compares traditional coating side
Method, the present invention has higher specific surface area, can carry out mass and be applied in actual productive life to play safe anti-
The effect of shield.
The present invention plates the layer of Ni-P chemical deposits such as (or Ni-W-P, Ni-Mo-P) on existing ordinary carbon steel square steel tube,
The anti-wear performance for making has a significant raising, and enhances the corrosion resistance of square steel tube, greatly extends the use longevity of square steel tube
Life, so as to significantly reduce the use cost of square steel tube.Such as on the square steel tube at plating 0.05mm thick Ni-P plated films and Jing timeliness
After reason, the service life of square steel tube will extend 20～25 times under the same terms；During such as plating 0.07mm thick Ni-P plated films and Jing
After effect process, service life will extend 28～45 times under the same terms.If plating is covered with the Ni-W-P plated films or Ni- of same thickness
Mo-P plated films, the service life of square steel tube will also be increased substantially on the basis of Ni-P plated films.If being plated with 0.1mm thickness
Ni-P plated films simultaneously Jing after Ageing Treatment, before its life-span and plating 50～60 times will be extended.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of wooden Baogang-steel and wood composite post, it is characterised in that the wooden Baogang-steel and wood composite post includes square steel tube；The side
Plank and lower plank are coated with outside steel pipe；The upper plank and lower plank are connected by fastener or are pasted by adhesive and connected
Connect；
The square steel tube surface is coated with Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy three-partalloys
Layer；Each unit of Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy layers by mass percentage
Cellulose content is respectively：Ni5.13%-P0.015%, Ni 5.13%-W 9.32%-P0.018%, Ni5.13%-
Mo4%-P0.02%；The Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy layers
Thickness is 0.05mm～0.1mm.
2. wood Baogang-steel and wood composite post as claimed in claim 1, it is characterised in that connect on the upper plank or lower plank
There is plank protruding block；The plank protruding block both sides are fixed with glued board by screw respectively；The glue of plank protruding block both sides
Plywood is connected by bolt with outside built-in fitting；The glued board of the bolt-through two and built-in fitting.
3. wood Baogang-steel and wood composite post as claimed in claim 1, it is characterised in that the length of the plank and a width of 200mm ×
200mm or 300mm × 200mm or 300mm × 300mm.
4. wood Baogang-steel and wood composite post as claimed in claim 1, it is characterised in that the thickness and the length of side of the square steel tube is 5mm
× 65mm or 6mm × 100mm or 7mm × 100mm or 8mm × 65mm.
5. wood Baogang-steel and wood composite post as claimed in claim 1, it is characterised in that the square steel tube or for 100 × 65 × 5
Rectangle steel, or for 100 × 65 × 6 rectangle steel, or for 100 × 65 × 8 rectangle steel.
6. wood Baogang-steel and wood composite post as claimed in claim 1, it is characterised in that described adhesive is resorcinol.
7. wood Baogang-steel and wood composite post as claimed in claim 1, it is characterised in that Ni-P binary alloy layers or Ni-W-P
The method of coating of ternary alloy layer or Ni-Mo-P ternary alloy layers includes：
Activation square steel tube 120～150 seconds, clear water is rinsed, and then deionized water or distilled water are cleaned；
Plating induction 60～90 seconds under the 100 μ A～800 μ A functions of current；
Plated film：Square steel tube after induction is placed in vacuum magnetic-control sputtering equipment, it is 10 to control the indoor vacuum of sputtering-4Magnitude
When, protective gas is filled to sputtering chamber, the flow indication for adjusting flowmeter to protective gas is 15sccm～20sccm；When magnetic control splashes
When the vacuum of jet device is 1Pa～10Pa, opening d.c. sputtering general supply makes Ni-P binary alloy layers or Ni-W-P ternarys
Alloy-layer or Ni-Mo-P ternary alloy layers gradually build-up of luminance, slide valve is adjusted after build-up of luminance makes the gas circuit mouth of pumping diminish, and pumping becomes
Slowly, the vacuum for making magnetron sputtering apparatus is 0.85Pa～8Pa, controls power and is sputtered for 50W～100W, and sputtering time is
2S～10S；
By the side for being coated with Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy layers for obtaining
Steel pipe is heated under conditions of vacuum is 0.05Torr～2Torr, and with the speed of 8 DEG C/min～15 DEG C/min hot dip is added
There is the square steel tube of alloy-layer, then heat to 300 DEG C～900 DEG C and keep 60min～100min at this temperature, that is, moved back
The square steel tube for being coated with Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternary alloy layers after fire；It is standby
With；
Hot water, cold water are successively cleaned, and are dried；Be incubated at a temperature of 500 DEG C is carried out at timeliness for 90 minutes～100 minutes to plated film
Reason；Then obtain being coated with Ni-P binary alloy layers or Ni-W-P ternary alloy layers or Ni-Mo-P ternarys after Ageing Treatment
The square steel tube of alloy-layer.
8. wood Baogang-steel and wood composite post as claimed in claim 7, it is characterised in that activation square steel tube was needed before 120～150 seconds
Carry out：
Treating the square steel tube of coating carries out electrochemical deoiling 9 minutes～12 minutes, then ultrasonic wave cleaning 3 minutes～6 minutes, then
Clear water is rinsed；Chemical derusting 60 seconds～90 seconds again, clear water is rinsed.
9. wood Baogang-steel and wood composite post as claimed in claim 7, it is characterised in that the protective gas is argon gas.
10. the building element of the reparation ancient building that a kind of wooden Baogang described in utilization claim 1-steel and wood composite post builds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710096707.0A CN106639156A (en) | 2017-02-22 | 2017-02-22 | Wood-coated steel-steel and wood composite column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710096707.0A CN106639156A (en) | 2017-02-22 | 2017-02-22 | Wood-coated steel-steel and wood composite column |
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| Publication Number | Publication Date |
|---|---|
| CN106639156A true CN106639156A (en) | 2017-05-10 |
Family
ID=58844784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710096707.0A Pending CN106639156A (en) | 2017-02-22 | 2017-02-22 | Wood-coated steel-steel and wood composite column |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104373A (en) * | 2017-10-16 | 2018-06-01 | 北京林业大学 | A kind of T steel-wood combined column and preparation method thereof |
| CN109339236A (en) * | 2018-09-21 | 2019-02-15 | 长枫建设集团有限公司 | A kind of pseudo-classic architecture beam column wood armored structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104373A (en) * | 2017-10-16 | 2018-06-01 | 北京林业大学 | A kind of T steel-wood combined column and preparation method thereof |
| CN109339236A (en) * | 2018-09-21 | 2019-02-15 | 长枫建设集团有限公司 | A kind of pseudo-classic architecture beam column wood armored structure |
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