Research On Finger-jointed Properties And Equipment Of Multi-sided Bamboo Recombining In Original State Unit

This paper describes the meaning and the preparation process of multi-sidedbamboorecombining in original status unit. Researth the change on the physical and mechanicalproperties of multi-sidedbamboo recombining in original status unit, try to explore optimalfinger-jointed process parameters of multi-sidedbamboo recombining in original status unit,research the finger-jionted equipment of multi-sidedbamboo recombining in original statusunit, and establish the demonstration production line of multi-sidedbamboo recombining inoriginal status unit in the factory. Finally,make a resonable assessment to the social value andeconimic benefits of multi-sidedbamboo recombining in original status unit and its equipment.this research is to promote the dustrial production of multi-sidedbamboo recombining inoriginal status unit, key technical parametres that determine the line eqipment ofmulti-sidedbamboo recombining in original status unit and industrial production program andapplication in the field in architecture technical support of multi-sidedbamboo recombining inoriginal status unit.In this paper, the innovation and the main conclusions are as follows:1）Multi-sidedbamboo recombining in original status unit was cooked and dried process,the color becomes deeper. Specific performance: coMPared with the untreated bamboo, itscolor from yellow to white to brown. Lightness parameter L*bamboo decline, a*decrease ofapproximately25.32%; red and green axis chromaticity index a*showing a trend change tothe red axis, changes in the range of19.43%; yellow-blue axis chromaticity index b*showinga change to the blue axis relative to the the trend in the variation of the amplitude of25.4%,the the bamboo surface of the color begins to move closer to the central axis direction of theyellow-blue axis. Comprehensive color△E*is9.42, bamboo become darken.2）The dimensional stability of treated multi-sidedbamboo recombining in original statusunit have been significantly improved. Compared with entreated bamboo, the volume ofair-dry and dry volume of a downward trend of multi-sided bamboo recombining in originalstatus unit. Air-dry volume shrinkage rate relative increase to22.48%and22.52%relative increase in the dry volume shrinkage rate; air-dry volume swelling rate is relatively therelative increase to28.25%, after absorbing water volume swelling ratio relative increaseto19.31%. Air-dry volume shrinkage rate, dry volume shrinkage rate, swelling rate of air-dryvolume, water volume swelling rate of single-factor analysis of variance results show that theexperimental data with mathematical and statistical significance, treated wood and untreatedwood between showed significant differences.3） Research and analysis on the pre-test results obtained of multi-sidedbamboorecombining in original status unit, can get optimal finger-jointed process parameters ofmulti-sidedbamboo recombining in original status unit, the end-pressure is12MPa, the long offinger-joined is15mm. the condition can guarantee the appearance of the material and the highstrength.4） The bending strength,parallel to grain compressive strength and tensile strengthparallel to grain all increases as the end-pressure and finger-jioned of multi-sidedbamboorecombining in original status unit. Refers to the length is12mm, bending strength with theend-pressure increased by15.85%,18.91%increase in the compressive strength, parallel tograin tensile strength increased by13.58%; refers to the length is15mm, bending strength canbe increased11.06%, parallel to grain compressive strength can be increased by17.1%, tensilestrength parallel to grain increased by17%.5） Do two-way ANOVA analysis to the mechanical properties of multi-sidedbamboorecombining in original status unit, the results showed that: the F value is positive by themechanical properties of multi-sidedbamboo recombining in original status unit, and in thelevel of alpha=0.01, P <0.001, datastatistically significant. Refers to the length and sidepressure was significantly affect the performance of its flexural strength, long andend-pressure interactions flexural strength of not significant. Refers to the parallel to graincompressive strength is more significant, peer pressure and the combined effect of the two nosignificant effect on the compressive strength of its parallel to the grain. Long and endpressure tensile strength of the material are significant, both the interaction effect was notsignificant. 6） To do the regression analysis for the mechanical properties of multi-sidedbamboorecombining in original status unit, the flexural strength parallel to grain compressive strengthparallel to grain tensile strength and finger pressure terminals (X1) and refers to the length (X2)between mathematicalregression models were on＝4.796X1+6.95X2+53.137(R2＝0.453)、＝3.925X1+4.039X2+37.148(R2＝0.296)、＝2.845X1+4.33X2+47.059(R2＝0.184);morethan three model F-test shows that Pr>F,F <0.01, the fitting effect is very significant; t-testshows that end-pressure parameters (X1) and (X2) refers to the length, the regressioncoefficient of X1and X2is significant. Using the above three models, can predict the change inmechanical properties under certain conditions of multi-sidedbamboo recombining in originalstatus unit.7） In this paper, to make the equipment design methods and major institutions ofmulti-sidedbamboo recombining in original status unit, and design the supporting hydraulicsystem, pneumatic system, developed supporting fixtures and heating systems. Equipment inline with the green, environmental protection, energy-saving principle, the use of mechanicaloptimization design method, the device has a simple, practical, reliable and durable, easyoperation and maintenance, high security features, not only reduces the labor intensity, butalso improves the efficiency of production multi-sidedbamboo recombining in original statusunit, fully meet the large-scale production and industrial application.8） Reference to the national standard GB/T50344-2004“building structure detectiontechnology standard” on the the mechanical properties testing of multi-sidedbamboorecombining in original status unit, the result show that, multi-sidedbamboo recombining inoriginal status of pure bending strength to20MPa. In the destruction of the bending strengthduring the test, the Bamboo unit near the lower end of the middle adhesive on the site tornbamboo tenon staggered, local damage. The multi-sidedbamboo recombining in original statusscrimber compressive strength parallel to grain32.64MPa. In Shun texture compressive failureduring the test means connected parts of the defective bamboo unit first appeared damaged,manifestations of multi-sidedbamboo recombining in original status unit connected parts of the tongue and tear, and exploded from the inside out. Performance of the mechanical strengthof structural materials for load-bearing occasions standard.9）After the implementation of the project, to increase the economic value-added of thebamboo, promote farmers income and the economic development of the bamboo producingareas. At the same time, to enhance China’s bamboo processing and utilization of itsequipment level, the protection of forest resources, ease the contradiction between supply anddemand of wood, and the implementation of the bamboo industry energy conservation,low-carbon model, to improve the living and the living environment will play an active role.