CN101564854A - Structural laminwood and preparation method thereof - Google Patents
Structural laminwood and preparation method thereof Download PDFInfo
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- CN101564854A CN101564854A CNA2009100856389A CN200910085638A CN101564854A CN 101564854 A CN101564854 A CN 101564854A CN A2009100856389 A CNA2009100856389 A CN A2009100856389A CN 200910085638 A CN200910085638 A CN 200910085638A CN 101564854 A CN101564854 A CN 101564854A
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Abstract
The invention provides a structural laminwood and a preparation method thereof. The laminwood is stacked and glued by 2-7 layers of veneers, wherein the grade of the external layer veneer of the laminwood is equal to the grade of the adjacent internal layer veneer or higher than the adjacent internal layer veneer by one grade; the veneer grade is determined by the average value of flexural elastic modulus of the target grades of all veneers; and compared with the veneers with lower grades, the veneers with higher grades have greater average value of the flexural elastic modulus of the target grades. The method lengthens the stock lumbers of short dimensions by mechanical stress grading and uses the lengthened stock lumbers as the veneers, then configures the veneer structures according to a grade configuration principle and coldly presses and glues the veneers to prepare the structural laminwood. The laminwood has excellent structural performance and can be used for the components such as beams, columns, and the like in wood structure buildings or other buildings.
Description
Technical field
The invention relates to a kind of laminated wood and manufacture method thereof, specifically be about a kind of structure that can be used for the members such as beam, post in timber buildings or other building with laminated wood and manufacture method thereof, belong to the wood processing technique field.
Background technology
Laminated wood results from the nineties in 19th century, but just imports China the eighties in 20th century into, in the existing nearly 30 years developing histories of China.The laminated wood of domestic production mainly contains two types: structure is used and non-structure is used.Non-structure is bigger with laminated wood output, and manufacturing enterprise is many, and product is mainly used in fields such as furniture, finishing; The seeds of using have softwood and broadleaf; Laminate change in size scope is big, does not also carry out laminate classification and configuration in the manufacture process.Structure is few with laminated wood manufacturing enterprise, and product all exports to foreign countries; Using seeds mainly is the Russian pinus sylvestris var. mongolica of import; Laminate processing dimension and strength grading and equipping rules are all by foreign standard and customer requirement.
In recent years, along with enlivening of China timber buildings market, large-scale timber structural system range of application in residential architecture (as ordinary residence, apartment etc.) and public building (as memorial museum, gymnasium etc.) is constantly expanded, and the demand of wooden structural timber especially laminated wood product is risen just year by year.But mainly there is following drawback in the external laminated wood of import: the one, and the product price height, another is that the product size system is inconsistent, method of testing there are differences.Accelerating the structure applications of the homemade artificial forest wood of China, is the effective way that solves current problem.
China since nineteen fifty-three just the Industrial Plantation construction, up to the present the area of artificial forest occupies first place in the world, China fir accumulation maximum in all artificial forest seeds.Rationally utilize particularly wood of Cunninghamia lanceolata manufacturing structure laminated wood of artificial forest wood, not only can satisfy the demand of the environmentally friendly type structural wood of construction market, can also promote the level of utilizing in China artificial tree aptitude source, promote the quick upgrading of traditional timber secondary industry.
How to utilize homemade artificial forest wood manufacturing structure to become one of problem of industrial quarters for a long time and building circle paying close attention to the most with laminated wood.
Summary of the invention
One object of the present invention is to provide a kind of structure laminated wood, belongs to construction material, can be used as the beam and column member, is used for residential architecture and public building.
Another object of the present invention is to provide a kind of manufacture method of laminated wood, improve the structural behaviour of final products, improve its stable mechanical property and reduce variability, improve the utilization rate of timber.
Among the present invention, mainly be, glue together the manufacturing structure laminated wood again according to grade equipping rules configuration glued laminated wood structure.
On the one hand, the invention provides a kind of structure laminated wood, this laminated wood with 2～7 layer by layer plate lamination gummed form, wherein, the outer laminate grade of this laminated wood equals its adjacent inner layer laminate grade or is higher than its adjacent inner layer laminate, preferably is higher than its adjacent inner layer laminate one-level.
According to specific embodiments of the present invention, and definite, the laminate of higher level is compared its goal gradient modulus of elasticity in static bending mean value with the laminate of lower grade bigger according to each laminate goal gradient modulus of elasticity in static bending mean value for described laminate grade.In preferred version of the present invention, the difference of the goal gradient modulus of elasticity in static bending mean value of the laminate of high and low adjacent two grades is 2GPa.
According to preferred specific embodiments of the present invention, the goal gradient modulus of elasticity in static bending mean value of the outermost layer laminate of laminated wood of the present invention is more than or equal to 12GPa.
According to preferred specific embodiments of the present invention, in the laminated wood of the present invention, scribble structure glue between each laminate, described structure is preferably resorcinol-formaldehyde resin glue with glue, when specifically implementing, adopts double spread, every glue-spread 120～150g/m
2
In a specific embodiments of the present invention, the load direction of laminated wood of the present invention is parallel with the glue-line direction, and the number of laminae of this laminated wood is 2 or 3 layers.
In another specific embodiments of the present invention, the load direction of laminated wood of the present invention is vertical with the glue-line direction, and the number of laminae of this laminated wood is 3,4,5,6 or 7 layers.
According to preferred specific embodiments of the present invention, in the laminated wood of the present invention, each laminate and adjacent laminate are taken turns reverse manner per year and are placed.
In preferred specific embodiments of the present invention, this laminated wood is an artificial forest China fir laminated wood, and its elastic modelling quantity standard value and bending strength standard value can be estimated according to formula (I), (II) respectively:
Wherein: E is a laminated wood elastic modelling quantity standard value; E
iIt is the i average elasticity modulus of plate grade correspondence (goal gradient elastic modelling quantity mean value) layer by layer; I
iIt is the i the moment of inertia of plate layer by layer; I
nBe the n the moment of inertia of plate laminated wood (this moment of inertia can be calculated by theoretical method according to the record of prior art and know) layer by layer for the those skilled in the art;
F
b=15.141e
0.0743EFormula (II),
Wherein: F
bBe laminated wood bending strength standard value.
Laminated wood of the present invention, meet the requirement of relevant criterion or standard as " Code for design of timber structures (GB50005-2005) " etc., have good structural behaviour, can be used as the beam and column member, be used for residential architecture (as ordinary residence, apartment etc.) and public building (as memorial museum, gymnasium etc.).
In the present invention, in order to improve timber utilization rate, the laminate of laminated wood of the present invention can be a finger joint lumber.Preferably grade among the present invention, utilize the mechanical stress material that grades to carry out finger, will be beneficial to the structural behaviour of the finger laminate that manufactures like this as the finger unit according to the modulus of elasticity in static bending of each finger unit.According to specific embodiments of the present invention, each of described laminated wood plate is layer by layer formed by ad eundem, two above finger unit fingers, and the finger unit of described ad eundem is meant that the modulus of elasticity in static bending minimum of a value minimum of each finger unit in this grade is than the little 1GPa of goal gradient modulus of elasticity in static bending mean value.
According to preferred specific embodiments of the present invention, described finger unit moisture content 10%～15% refers to tenon length 25mm～30mm, chimeric degree 0.2～0.4mm, and gradient 1/10～1/12, the finger end does not have the degradation defective in the 5cm inward; Finger structure glue is resorcinol-formaldehyde or aquosity polymer isocyanic ester resin glue, single spreading, glue-spread 0.2～0.4g/cm
2
The finger joint lumber that utilizes method of the present invention to obtain has good structural behaviour, and its modulus of elasticity in static bending standard value is 0.80～0.95 times of finger cell-average value, and bending strength and tensile strength standard value are 0.7～0.9 times of finger unit standard value.
The present invention is by making laminated wood with above-mentioned finger joint lumber as laminate, and resulting laminated wood has good structural behaviour equally, can be used as the structure laminated wood.
On the other hand, the present invention also provides the manufacture method of described laminated wood, and this method mainly comprises step:
The wide face of laminate is coated with structure glue, stacked arrangement, wherein, the outer laminate grade of laminated wood equals its adjacent inner layer laminate grade or is higher than its adjacent inner layer laminate, preferably is higher than its adjacent inner layer laminate one-level;
Adopt the persistent pressure mode at the laminated wood thickness direction, pressure remains on the fixed value between 0.8MPa～0.9MPa, and normal temperature cure was piled up health 7～8 days afterwards.
In a specific embodiments of the present invention, the laminate of described laminated wood is to be formed by two above finger unit fingers, the manufacture method of laminated wood of the present invention also comprises the step of making described finger laminate, mainly is short dimension stock elder generation machinery to be graded make finger joint stock lumber as laminate by the mode spreading of finger again.According to specific embodiments of the present invention, the step of the described finger laminate of manufacturing of the present invention comprises: the modulus of elasticity in static bending according to each finger unit is graded to the finger unit; Each finger unit is carried out mill teeth; Finger unit ad eundem, behind the mill teeth is carried out finger, wherein, preferably control finger and carry out, finger joint lumber after the 20～30s that keep-ups pressure on the finger joint machine reaches initial cure, is piled up health 18～24h again, obtain the finger laminate at 20～30 ℃.Utilize method of the present invention, in advance the finger unit is carried out stress and grade,, not only can improve the utilization rate of timber, can also improve the structural behaviour of finger joint lumber according to different brackets combination finger spreading.
According to specific embodiments of the present invention, the manufacture method of laminated wood of the present invention is mainly carried out according to following operation:
(1) log is processed into the dimension stock of certain-length, and grades.According to the preferred embodiments of the invention, the length of these dimension stocks is 1.0～3.0m, more preferably 2.0～3.0m; Sectional dimension should satisfy " Code for design of timber structures (GB50005-2005) " requirement to dimension stock specification (for example 40 or 45 series); The present invention preferably controls the moisture content of these dimension stocks 10%～15%.
Among the present invention, be above-mentioned dimension stock to be graded according to the modulus of elasticity in static bending.The modulus of elasticity in static bending of described each dimension stock can directly measure according to the record method of prior art or obtain by other calculation of parameter of measuring test specimen.In of the present invention one preferred specific embodiments, be to measure the basic natural frequency of vibration of China fir dimension stock and preferably utilize following formula (III) to calculate the modulus of elasticity in static bending by the oscillation crosswise method:
E=0.95L
4f
2ρ/h
2Formula (III)
In the formula: E is the modulus of elasticity in static bending, the Pa of unit;
L is test specimen (finger unit) length, the m of unit;
F is the basic natural frequency of vibration, the Hz of unit;
ρ is a test specimen density, units/m
3
H is the test specimen height, the m of unit.
Utilize above-mentioned preferred version of the present invention, can calculate the modulus of elasticity in static bending of dimension stock comparatively exactly.
Then, the modulus of elasticity in static bending according to each dimension stock is divided into tier group.During concrete enforcement, can determine the elastic modelling quantity mean value of goal gradient earlier according to the final use of manufacturing glued board,, determine the upper and lower boundary value of elastic modelling quantity of each grade then according to goal gradient elastic modelling quantity mean value.Concrete definite method can be followed following principle: 1. the interval lower limit of the elastic modelling quantity of each grade correspondence (being minimum of a value) is minimum (is E than the little 1GPa of goal gradient modulus of elasticity in static bending mean value
Min〉=(E
Ave-1GPa)); 2. each grade can not established peak, but considers for aspects such as economic interests, and the interval higher limit of the elastic modelling quantity of each grade correspondence (being maximum) (is E smaller or equal to the lower limit of a high grade preferably
G, max≤ E
G+1, min), highest ranking is not established peak.To dimension stock back mark each tier group of grading.
According to building module, China state inner structure should be 3m, 6m, 9m or 12m with laminated wood product factory length.Among the present invention, if the laminated wood finished product length of making equates (for example being 3m) just with above-mentioned dimension stock, then above-mentioned dimension stock can be directly as glued laminated wood; If the laminated wood finished product length that needs to make surpasses above-mentioned dimension stock, need be with above-mentioned dimension stock finger spreading as glued laminated wood, these dimension stocks are the finger unit.Among the present invention,, before finger, should cut out if 5cm is interior if any degradation defectives such as knots inward for finger unit finger end.
During finger, the finger end of finger unit stood up carry out mill teeth.The inventor finds that under study for action the length of finger joint teeth is one of key parameter that influences the final finger joint lumber structural behaviour of the present invention.Among the present invention, preferred described finger joint teeth is the long tooth of long 25mm～30mm.According to more preferably scheme of the present invention, be according to the chimeric degree of 0.2～0.4mm (t) mill teeth, tooth gradient 1/10～1/12.Being suitable for finger tenon structure type of the present invention is V-type, and the present invention does not have specific (special) requirements to other structural parameters that refer to tenon.
Afterwards, the finger unit behind the mill teeth of ad eundem is carried out finger.Among the present invention, preferably use structure with glue resorcinol-formaldehyde or aquosity polymer isocyanic ester resin glue, carry out the single face brushing, the single spreading amount is controlled at 0.2～0.4g/cm
2Behind the gluing, the finger unit of ad eundem is vertically being carried out room temperature (20～30 ℃) finger on the spreading finger joint machine.The finger end is pressed for a person skilled in the art and can be determined according to tooth length and seeds according to the record of prior art.According to the preferred embodiments of the invention, it is the finger end pressure when determining finger for the long power function relationship of tooth according to finger end pressure, for example artificial forest China fir end is pressed (p, units MPa) can press the long (l of tooth, the mm of unit)-0.434 power multiply by 30.938 times again and calculates theoretical optimal value, and the end during practical operation is pressed and can be held the suitable adjustment of carrying out on the basis of pressing by a small margin in this theory the best according to actual conditions.Among the present invention, finger joint lumber after the 20～30s that keep-ups pressure on the finger joint machine reaches initial cure, is piled up health 18～24h (normal temperature is piled up health and got final product) again, can obtain finger joint stock lumber of the present invention, can be used as the laminate of laminated wood.The grade of these laminates is promptly graded according to goal gradient elastic modelling quantity mean value according to preceding method.
Utilize above-mentioned finger technology of the present invention, meet certain functional relation between the mean value of mechanical property standard value such as the different brackets that the produces combination finger joint stock lumber modulus of elasticity in static bending, bending strength and tensile strength and finger unit or the standard value (this standard value is 5% tantile of elastic modelling quantity probability distribution curve, is 0.80 times of mean value).Among the present invention, the modulus of elasticity in static bending standard value of this finger joint stock lumber is 0.80～0.95 times of finger unit bending elastic modelling quantity mean value (goal gradient modulus of elasticity in static bending mean value), and bending strength and tensile strength standard value are 0.7～0.9 times of finger unit standard value (this standard value for the those skilled in the art can according to the record of prior art as determining by consulting " Code for design of timber structures (GB50005-2005) ").Described multiple relation specifically has some differences according to different upper-lower hierarchy combinations, for example, (for example elastic modelling quantity mean value 8～9GPa) makes up the finger joint stock lumber of making for inferior grade, the elastic modelling quantity standard value is 0.88～0.95 times of finger cell-average value, and other mechanical property such as standard values such as bending strength and tensile strength are 0.8～0.9 times of finger unit standard value; And the high-grade (finger joint stock lumber made of elastic modelling quantity mean value 11～13GPa) combination for example, the elastic modelling quantity standard value is 0.80～0.92 times of finger cell-average value, and other mechanical property such as standard values such as bending strength and tensile strength are 0.7～0.8 times of finger unit standard value.In addition, among the present invention, the number of single finger joint stock lumber middle finger order unit does not make significant difference to the performance parameter of finger joint stock lumber product.
(2) with each laminate stacked arrangement.Wherein, the basic principle of laminate configuration is the outermost layer that the laminate that grade is high is positioned over laminated wood, and the laminate that grade is low is positioned over the middle level of laminated wood.Particularly, the outer laminate grade of laminated wood should equal its adjacent inner layer laminate grade or be higher than its adjacent inner layer laminate, when outer laminate grade is higher than its adjacent inner layer laminate, and preferred high one-level.For example, according to a specific embodiments of the present invention, be that described laminate is divided into from low to high four grade: L1, L2, L3, L4, each goal gradient modulus of elasticity in static bending mean value is respectively 8GPa, 10GPa, 12GPa, 14GPa.When the configuration glued laminated wood, outermost layer can use L4 or L3 grade laminate, counts second layer laminate grade outward and is equal to or less than the outermost layer one-level, and outer several the 3rd layer of grade are equal to or less than outer number second layer one-level, and the like, middle one deck can use inferior grade such as L2 or L1 grade laminate; In addition, a side laminate grade can be equal to or less than opposite side symmetrical layers laminate grade.Among the present invention, can determine glued laminated wood quantity according to the relation of load direction and glue-line direction, when the load direction was parallel with the glue-line direction, number of laminae was 2 or 3; When the load direction was vertical with the glue-line direction, number of laminae was 3,4,5,6 or 7.Among the present invention, glued laminated wood quantity is 7 to the maximum.For example, for 5 layers laminated wood, each laminate grade can be followed successively by: L4, L4, L4, L4, L4; L3, L3, L3, L3, L3; L4, L3, L2 or L3, L3, L4; L3, L3, L2 or L3, L3, L4; L3, L2, L2 or L1, L2, L3.For 3 layers laminated wood, each laminate grade can be followed successively by: L4, L3, L4; L3, L2, L3; L4, L2, L4.
When the configuration laminate, each laminate and adjacent laminate are taken turns the reverse manner placement per year in the laminated wood.Adjacent two layers plate joint distance is more than 30cm during the laminate lamination, and interlaced arrangement does not overlap along all laminate joints of lamination direction.
In addition, the wide face of the laminate between laminate scribbles structure with glue resorcinol-formaldehyde resin glue, carries out two-sided brushing, and every glue-spread is controlled at 120～150g/m
2
(3) laminated wood after the configuration adopts the persistent pressure mode at thickness direction, and pressure remains on the fixed value between 0.8MPa～0.9MPa.Normal temperature (20～30 ℃) solidifies, and is about 12h or longer hardening time, piles up health afterwards 7～8 days.Conditioned time is dimensioned to 3m, 6m, 9m or 12m equidimension series after finishing as requested, promptly gets laminated wood finished product of the present invention.
The inventor tests the mechanical property of large batch of laminated wood by a large amount of experiments, and the research back is found by analysis, and mechanical property standard values such as the modulus of elasticity in static bending of the laminated wood that the present invention produces, bending strength can be estimated by following formula:
Laminated wood elastic modelling quantity standard value
Wherein: E is; E
iIt is the i average elasticity modulus of plate grade correspondence layer by layer; I
iIt is the i the moment of inertia of plate layer by layer; I
nBe the n the moment of inertia of plate laminated wood layer by layer;
Laminated wood bending strength standard value F
b=15.141e
0.0743E
Thereby mechanical property standard values such as the modulus of elasticity in static bending of the laminated wood that the present invention produces, bending strength can be carried out the structural design use according to above-mentioned formula, and needn't need to determine concrete standard value through Mechanics Performance Testing again.
Among the present invention, the operation of not mentioning in detail can be carried out according to the prior art or the conventional method in affiliated field.
In sum, the present invention is by grading back finger spreading as laminate with dimension stock through mechanical stress, and wide again face applies structure glue, and according to grade equipping rules configuration layer plate structure, and the gummed of colding pressing produces the laminated wood that meets Structural Design Requirement.Utilize technology of the present invention, technology is simple, and can improve timber utilization rate, can improve the structural behaviour of final products, improves its stable mechanical property and reduces variability.And, laminated wood of the present invention, mechanical property standard values such as its modulus of elasticity in static bending, bending strength can utilize the average elasticity modulus of laminate grade correspondence and the moment of inertia of laminate to carry out the structural design use, must not determine through Mechanics Performance Testing again.Laminated wood of the present invention can be used as the structure laminated wood.
The specific embodiment
Below in conjunction with specific embodiments and embodiment the present invention is described in further details, is intended to help the reader to understand technical spirit of the present invention and the beneficial effect that can produce better, can not be interpreted as any qualification the scope of the present invention.
Embodiment
Earlier with the artificial forest China fir (by the diameter of a cross-section of a tree trunk 1.3 meters above the ground 20～35cm) logs be processed into sectional dimension be the dimension stock of 45mm (T) * 90mm (W), the about 2000mm of length (L) as the finger unit, each finger unit moisture content is controlled at 10～15%.The finger end does not have degradation defectives such as knot, cracking in the 5cm inward.
According to following table of grading, artificial forest China fir dimension stock is directly measured the modulus of elasticity in static bending and is divided into four grades through crooked sorter.
Finger unit finger end stood up carry out mill teeth, mill out 25mm or the long tooth of 30mm finger, gradient 1/10 or 1/12 according to the chimeric degree of 0.3～0.4mm (t).Use structure with glue resorcinol-formaldehyde, carry out the single face brushing, single spreading amount 0.2g/cm
2～0.4g/cm
2(in this scope, the difference of glue-spread does not make significant difference to the finger joint lumber structural behaviour).After displaying the infiltration of 60s, the ad eundem dimension stock is vertically being carried out room temperature (20～30 ℃) finger on the spreading finger joint machine in order to glue.Control finger end is pressed 7.4MPa on finger joint machine, after maintenance 20～30s reaches initial cure, piles up health 18～24h again, obtain finger joint lumber, as the laminate of laminated wood of the present invention, finger joint lumber length is about 12m in the present embodiment, and each finger joint lumber is formed by 4～6 finger unit fingers.
Use structure with glue resorcinol-formaldehyde resin glue at the wide face of laminate, carry out two-sided brushing, every glue-spread is controlled at 120g/m
2
In the present embodiment, dispose the glued laminated wood structure in such a way:
The laminate configuration mode of three layers of laminated wood is (laminated wood load direction is vertical with the glue-line direction):
| L3 |
| L2 |
| L3 |
The laminate configuration mode of five layers of laminated wood is:
| L4 |
| L3 |
| L2 |
| L3 |
| L4 |
Each laminate and adjacent laminate are taken turns the reverse manner placement per year in the laminated wood.Adjacent two layers plate joint distance is more than 30cm during the laminate lamination, and interlaced arrangement does not overlap along all laminate joints of lamination direction.Wherein, the long 30mm of finger laminate finger joint teeth of three layers of laminated wood, the long 25mm of finger laminate finger joint teeth of five layers of laminated wood.
Laminated wood after the configuration adopts the persistent pressure mode at thickness direction, and pressure remains on 0.8MPa.Normal temperature (20～30 ℃) solidifies, and is about 12h hardening time.The laminated wood of making was piled up health 7～8 days again.Being processed into final size then is the laminated wood of 225mm (T) * 90mm (W) * 6000mm (L) and 135mm (T) * 90mm (W) * two kinds of thickness types of 6000mm (L).
Method according to standard A STM D198 is tested the mechanical property of the prepared artificial forest China fir of present embodiment laminated wood, and the result shows that the laminated wood that produces according to method of the present invention has good structural behaviour.In addition, according to the prediction of estimating of formula of the present invention (I) and formula (II) to laminated wood, compare with measured value, can show that the mechanical property standard values such as the modulus of elasticity in static bending, bending strength of laminated wood of the present invention can formula estimation according to the present invention and carry out structural design and use.Exemplarily listed the mechanical performance data of the part laminated wood product that makes in the present embodiment in the following table.
| Three layers of laminated wood numbering | Modulus of elasticity in static bending standard value (GPa) | Bending strength standard value (MPa) |
| 1 | 9.40 | 31.29 |
| 2 | 9.86 | 33.21 |
| 3 | 10.02 | 39.30 |
| 4 | 9.57 | 34.78 |
| 5 | 9.32 | 32.65 |
| 6 | 10.15 | 38.79 |
| 7 | 9.98 | 39.13 |
| Five layers of laminated wood numbering | Modulus of elasticity in static bending standard value (GPa) | Bending strength standard value (MPa) |
| 1 | 12.47 | 38.32 |
| 2 | 10.13 | 33.54 |
| 3 | 11.08 | 39.30 |
| 4 | 10.96 | 40.01 |
| 5 | 11.65 | 38.19 |
| 6 | 12.34 | 42.38 |
| 7 | 11.99 | 37.74 |
Claims (11)
1, a kind of structure laminated wood, this laminated wood with 2～7 layer by layer plate lamination gummed form, wherein, the outer laminate grade of this laminated wood equals its adjacent inner layer laminate grade or is higher than its adjacent inner layer laminate.
2, structure laminated wood according to claim 1, wherein, and definite, the laminate of higher level is compared its goal gradient modulus of elasticity in static bending mean value with the laminate of lower grade bigger according to each laminate goal gradient modulus of elasticity in static bending mean value for described laminate grade; And the difference of the goal gradient modulus of elasticity in static bending mean value of the laminate of high and low adjacent two grades is 2GPa.
3, structure laminated wood according to claim 1, wherein, the goal gradient modulus of elasticity in static bending mean value of the outermost layer laminate of this laminated wood is more than or equal to 12GPa.
4, structure laminated wood according to claim 1, wherein, structure glue is resorcinol-formaldehyde resin glue between each laminate, double spread, every glue-spread 120～150g/m
2
5, structure laminated wood according to claim 1, wherein, the load direction of this laminated wood is parallel with the glue-line direction, and the number of laminae of this laminated wood is 2 or 3 layers; Perhaps, the load direction of this laminated wood is vertical with the glue-line direction, and the number of laminae of this laminated wood is 3,4,5,6 or 7 layers.
6, structure laminated wood according to claim 1, wherein, at least one plate layer by layer of this laminated wood is formed by ad eundem, two above finger unit fingers, and the finger unit of described ad eundem is meant that the modulus of elasticity in static bending minimum of a value minimum of each finger unit in this grade is than the little 1GPa of goal gradient modulus of elasticity in static bending mean value.
7, structure laminated wood according to claim 6, wherein, described finger unit moisture content 10%～15% refers to tenon length 25mm～30mm, chimeric degree 0.2～0.4mm, gradient 1/10～1/12, the finger end does not have the degradation defective in the 5cm inward; Finger structure glue is resorcinol-formaldehyde or aquosity polymer isocyanic ester resin glue, single spreading, glue-spread 0.2～0.4g/cm
2
8, structure laminated wood according to claim 1, wherein, each laminate and adjacent laminate are taken turns reverse manner per year and are placed.
9, structure laminated wood according to claim 1, this laminated wood are artificial forest China fir laminated wood, and its elastic modelling quantity standard value and bending strength standard value are respectively:
F
b=15.14le
0.0743E, wherein: F
bBe laminated wood bending strength standard value.
10, the manufacture method of each described laminated wood of claim 1～9, the method comprising the steps of:
The wide face of laminate is coated with structure glue, stacked arrangement, wherein, the outer laminate grade of laminated wood equals its adjacent inner layer laminate grade or is higher than its adjacent inner layer laminate;
Adopt the persistent pressure mode at the laminated wood thickness direction, pressure remains on the fixed value between 0.8MPa～0.9MPa, and normal temperature cure was piled up health 7～8 days afterwards.
11, manufacture method according to claim 10, the laminate of wherein said laminated wood are to be formed by two above finger unit fingers, and this method also comprises the step of making described laminate:
The modulus of elasticity in static bending according to each finger unit is graded to the finger unit;
Each finger unit is carried out mill teeth;
Finger unit ad eundem, behind the mill teeth is carried out finger, and wherein, the control finger carries out at 20～30 ℃, and finger joint lumber after the 20～30s that keep-ups pressure on the finger joint machine reaches initial cure, is piled up health 18～24h again, obtains the finger laminate.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102463606A (en) * | 2010-11-05 | 2012-05-23 | 中国林业科学研究院木材工业研究所 | Method for producing laminated woods with small-diameter logs and produced laminated wood |
| CN102463607A (en) * | 2010-11-05 | 2012-05-23 | 中国林业科学研究院木材工业研究所 | Laminated plywood and production method thereof |
| CN103128824A (en) * | 2013-02-04 | 2013-06-05 | 中国林业科学研究院木材工业研究所 | I-shaped integrated material for structure and manufacturing method thereof |
| CN106223572A (en) * | 2016-08-31 | 2016-12-14 | 丰胜（广州）建材有限公司 | Manufacture method, floorboard and the floor of a kind of Masson Pine outdoor flooring block |
| CN107642197A (en) * | 2017-10-23 | 2018-01-30 | 南京林业大学 | A kind of bamboo and wood combined box type structure |
| CN114206568A (en) * | 2019-06-18 | 2022-03-18 | 木结构工业集团私人有限公司 | Engineered wood panels for structural use and methods of forming the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3750362A (en) * | 1972-03-29 | 1973-08-07 | Standard Packaging Corp | Method of packaging granular material |
| CN2152646Y (en) * | 1993-02-24 | 1994-01-12 | 王正华 | Bamboo thin-layer laminate |
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2009
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102463606A (en) * | 2010-11-05 | 2012-05-23 | 中国林业科学研究院木材工业研究所 | Method for producing laminated woods with small-diameter logs and produced laminated wood |
| CN102463607A (en) * | 2010-11-05 | 2012-05-23 | 中国林业科学研究院木材工业研究所 | Laminated plywood and production method thereof |
| CN102463607B (en) * | 2010-11-05 | 2014-04-16 | 中国林业科学研究院木材工业研究所 | Laminated plywood and production method thereof |
| CN102463606B (en) * | 2010-11-05 | 2015-01-07 | 中国林业科学研究院木材工业研究所 | Method for producing laminated woods with small-diameter logs and produced laminated wood |
| CN103128824A (en) * | 2013-02-04 | 2013-06-05 | 中国林业科学研究院木材工业研究所 | I-shaped integrated material for structure and manufacturing method thereof |
| CN103128824B (en) * | 2013-02-04 | 2015-04-01 | 中国林业科学研究院木材工业研究所 | I-shaped integrated material for structure and manufacturing method thereof |
| CN106223572A (en) * | 2016-08-31 | 2016-12-14 | 丰胜（广州）建材有限公司 | Manufacture method, floorboard and the floor of a kind of Masson Pine outdoor flooring block |
| CN107642197A (en) * | 2017-10-23 | 2018-01-30 | 南京林业大学 | A kind of bamboo and wood combined box type structure |
| CN114206568A (en) * | 2019-06-18 | 2022-03-18 | 木结构工业集团私人有限公司 | Engineered wood panels for structural use and methods of forming the same |
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| Publication number | Publication date |
|---|---|
| CN101564854B (en) | 2012-07-18 |
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