CN103072159A - Prestressed laminated wood with creep deformation resistance and preparation method and application thereof - Google Patents
Prestressed laminated wood with creep deformation resistance and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a prestressed laminated wood with creep deformation resistance, a preparation method and application thereof, belonging to the field of structural members for buildings. The laminated wood member comprises a top compression area, a middle shear area, a bottom tension area and an adhesive layer, wherein the top compression area, the middle shear area and the bottom tension area are arranged along the height direction of a wood beam, laminated plates in and among the top compression area, the middle shear area and the bottom tension area are mutually bonded, fixed and formed through the adhesive layer, the laminated wood member comprises the top compression area, the middle shear area and the bottom tension area, and the final water content of three parts of wood is the same and is 10% -12%. The principle is that high-stress-level structural wood is arranged in a tension and compression area of the laminated wood beam, moisture content gradients are arranged along the wood of three parts of the height of the member, after the wood with different moisture contents reaches balance and consistency, due to the fact that dehydration drying shrinkage and moisture absorption expansion of the wood are inhibited, the wood cannot be fully and freely stretched and deformed to generate prestress, the creep resistance of the laminated wood beam is obviously improved under the action of long-term load, inherent natural defects influencing the mechanical property in the wood are controlled in the early stage of member preparation, and the product is stable and reliable in structural property, high in rigidity and excellent in creep resistance and can be used as a load-bearing wood beam for a wood structure building.
Description
Technical field
The present invention relates to structural elements for building, be specifically related to prestressing force laminated wood that has the creep resistant deforming performance and its production and use.
Background technology
Laminated structure is owing to have that energy-conserving and environment-protective, structural behaviour are good, size shape is not subjected to the advantages such as former size class restriction, and building structure field is widely used abroad at present.In recent years, because the energy-saving and emission-reduction of China and the policy guide of green building technique, the laminated structure building also presents the impetus that develops rapidly in China, therefore utilize advanced wood processing technique to produce the laminated wood material of high-strength light, use it for building field, vast potential for future development and market are arranged.
In actual use, the structural beams cross section of conventional laminated wood wooden frame as shown in Figure 2, by adhesive layer 1 be timber laminate 2 combination, the bending failure overwhelming majority of conventional laminated wood wooden frame is to be lost efficacy at first by weak links such as the intrinsic natural defect of timber such as the knaur of its tensile region, twill or mechanical splice position artificial defects to cause that strength of wood especially rift grain compressive strength is not fully utilized.Simultaneously, conventional laminated wood wooden frame creep-resistant property under action of long-term load is relatively poor, and therefore the cross section of member is generally larger in Architectural Structure Design, and the laminated wood wooden frame seems big and heavy and bulkiness, and waste of material is serious.Simultaneously in the Architectural Structure Design, the definite of laminated wood wooden frame sectional dimension controls according to its rigidity often, meet in rigidity under the condition of designing requirement, the intensity of member is far super design load all, this has also caused the serious waste of material, and the member lightness can not get demonstrating fully, be unfavorable for promoting the use of of timber structure, for addressing this problem, existing method is to strengthen by disposing the non-natural materials such as high-strength FRP or reinforcing bar in laminated wood wooden frame tensile region, but the method has the following disadvantages: the non-natural materials such as high-strength FRP or reinforcing bar that bond need special adhesive to bond, this makes complicated construction technique undoubtedly, causes cost to increase; The poor operability of product processing and fabricating; Adopt the non-natural materials such as high-strength FRP or reinforcing bar to carry out prestressed stretch-draw, need to utilize special anchor to carry out Materials with High Strength fixing in laminated wood wooden frame end, the anchoring operation has difficulties, existing anchorage technology and device are not mature enough, application is poor, and the prestressing force damage is large, and the adding of anchor is so that the product cost increase; Adopt the expensive materials such as high-strength FRP, product cost increases, and adopts the metal materials such as high tensile reinforcement, the possibility of corrosion is arranged, thereby affect the performance of member, and the simultaneously adding of these materials makes product not belong to Green Ecological Material; The compatibility of the reinforcing material such as high-strength FRP or reinforcing bar and timber is poor, product in-service easily and the timber body peel off the poor reliability of product quality.
Summary of the invention
The technical problem that invention will solve
Poor for the conventional laminated wood wooden frame creep-resistant property under action of long-term load that exists in the above-mentioned prior art, laminated wood wooden frame cross section is excessive in the building, and compressive region timber is not fully utilized; The laminated wood wooden frame complicated construction technique of the non-natural Material reinforcements such as high-strength FRP or reinforcing bar, compatibility is poor between the material, the problem such as peel off easily, the invention provides prestressing force laminated wood with creep resistant deforming performance and its production and use, described prestressing force laminated wood, be used for laminated wood wooden frame field, by in laminated wood wooden frame short transverse laminate, setting moisture gradient in advance, eliminate by the later stage moisture gradient, the expand with wet and contract with dry of timber be subject to the constant dimensionally stable of moisture content timber constraint and can't Free Transform, thereby produce prestressed mode and strengthen wooden frame, overcome above-mentioned all deficiencies, efficiently solved the above problem that exists in conventional laminated wood wooden frame and the non-natural Material reinforcement wooden frame.
Technical scheme
Inventive principle:
The laminated wood wooden frame is according to architectural design and structure instructions for use, on affecting the intrinsic natural defect knot of timber mechanics performance and outward appearance visuality, the crack, twill, rotten, small holes caused by worms and hole are rejected and are controlled, utilization is in laminated wood wooden frame tension, compressive region disposes heavily stressed hierarchical organization timber, and along the timber of three parts of member height moisture gradient is set, different water cut timber reach balance consistent after, because timber dehydration drying shrinkage and moisture expantion are subject to the inhibition of the middle part timber that moisture content do not change, expand with wet and contract with dry distortion can not freely occur and produce prestressing force, the creep-resistant property of laminated wood wooden frame be improved significantly; The timber laminate that mechanical property is higher is configured in wooden frame tensile region, bottom and top compressive region in the glued laminated wood assembly in reality processing, and at the top along the wooden frame short transverse, the interior moisture content of contained timber laminate is adjusted to respectively of middle part and bottom Three regions is higher than, equal and be lower than the state of the dried equilibrium moisture content of gas, in wooden frame gummed extrusion forming and the maintenance processes, substantially do not change and constant dimension owing to moisture content in the central region of wooden frame height, timber desorb dehydration is done equilibrium moisture content to gas in the top area, and timber moisture absorption to gas is done equilibrium moisture content in the bottom section.Final laminated wood wooden frame shortens owing to top timber dehydration, but be subject to the middle part constant constraint of timber size and bear tension stress, simultaneously, its bottom timber moisture absorption is elongated, but be subject to the middle part constant constraint of timber size and bear compression stress, the tension stress at laminated wood wooden frame top and the compression stress of bottom are given its prestressing force.
Technology contents:
Have the preparation method of the prestressing force laminated wood of creep resistant deforming performance, the steps include:
(1) the log saw solution is become dimension stock, dimension stock is of a size of thickness range 20mm-45mm, width range 80mm ~ 280mm, length range 1000mm ~ 6000mm;
(2) to the dimension stock drying with its moisture control at 15%-25%, again its intrinsic natural defect knot, crack, twill, rotten, small holes caused by worms and hole are rejected and are controlled, and it is carried out stress grading and numbering mark;
(3) dimension stock is carried out antiseptic insect-repelling or fire retardant chemistry medicament dipping modification;
(4) will be the moisture content as the dimension stock of top compressive region and tensile region, bottom of heavily stressed grade after intensity has been graded adjust to respectively in 14% ~ 16% and 6% ~ 8% the scope, with the low stress grade as in the middle part of cut the dimension stock in district moisture content be controlled in 10% ~ 12% scope;
(5) dimension stock of in keeping moisture content 14% ~ 16%, 10% ~ 12% and 6% ~ 8% constant environmental condition district and tensile region, bottom being cut in top compressive region, middle part respectively carries out the finger spreading and laterally pieces together wide, and maintenance until adhesive solidify fully, spreading with piece together wide middle grain of wood direction towards consistent, finally prepare top compressive region, tensile region, bottom and middle part and cut district's timber laminate, spreading, piece together wide and maintenance in, in the constant environmental condition of the moisture content of correspondence, operate keeping it all the time;
(6) district and the timber laminate assembly of tensile region, bottom are cut in top compressive region, middle part, and it is carried out the superimposed pressurization of thickness direction, assembly and gluing all operate in the constant environmental condition of laminate moisture content separately keeping it, then pressurization and maintenance to adhesive solidify fully under temperature 18-22 ℃, the environmental condition of relative humidity 60-70%, pressure value 0.6MPa-1.2MPa, final laminated wood inside everywhere moisture content reaches uniformity, all reaches 10%-12%;
(7) at last to laminated wood carry out sizing processing, surface scrape polishing, repairing, covering with paint, check, user to sign, the final packaging warehouse-in.
The moisture content as the dimension stock of top compressive region and tensile region, bottom of special heavily stressed grade after will grading in described step 4 is adjusted to respectively in 15% ~ 15.5% and 6.5% ~ 7% the optimum range, with the low stress grade as in the middle part of cut the dimension stock in district moisture content be controlled in 11% optimum range.
It is raw material that the structural timber of pesudotsuga taxifolia, larch, Southern Pine, the heavily stressed grade of Lapland pine is adopted in described top compressive region and tensile region, bottom, and the wooden frame middle part is cut the district and used the structural timber of poplar, China fir, masson pine, the artificial fast growing wood of Eucalyptus or low stress grade to be raw material.
The adhesive that described adhesive layer uses is structure cold curing phenol-resorcin-formaldehyde resin stick, polyurethane adhesive, urea-melamine-formaldehyde resin adhesive stick or trimeric cyanamide-formaldehyde resin.
Comprise along top compressive region, the middle part of wooden frame short transverse according to the prestressing force laminated wood with creep resistant deforming performance of said method preparation and to be cut district, tensile region, bottom and adhesive layer, the district is cut at described top compressive region, middle part and the tensile region, bottom bonds fixed-type by adhesive layer mutually, describedly contain the laminated wood that top compressive region, middle part are cut district and tensile region, bottom, the final moisture content of three part timber is identical, all in 10% ~ 12% scope.
Prestressing force laminated wood with creep resistant deforming performance can be applied to the production of laminated wood wooden frame.
Beneficial effect
Described prestressing force laminated wood with creep resistant deforming performance, be mainly used in the laminated wood wooden frame field, its main technical point is before the preparation of laminated wood wooden frame, set moisture content gradient of wood in laminated wood wooden frame short transverse in advance, and heavily stressed grade timber laminate is configured in top and the bottom of wooden frame, its beneficial effect mainly contains following 6 points:
(1) described prestressing force laminated wood wooden frame with creep resistant deforming performance utilizes moisture content gradient of wood to produce prestressed mode, improves the structural behaviour of wooden frame, has improved the creep-resistant property of member, does not change material cost;
(2) compare with conventional laminated wood wooden frame, under the condition of identical mechanical property, described prestressing force laminated wood wooden frame area of section with creep resistant deforming performance is less, can save use timber, possesses the carbon of subtracting effect;
(3) compare with the conventional laminated wood wooden frame of uiform section, described complete wooden prestressing force laminated wood wooden frame mechanics creep resistant deforming performance improvement successful, in the time of namely need being controlled at identical deformation of creep scope, the volume of required member is less, but to save timber possesses the carbon of subtracting effect;
(4) described prestressing force laminated wood with creep resistant deforming performance all adopts the timber of pure green ecological, has avoided the aspect problems such as environmental protection, technology, application and durability of using the non-natural Material reinforcements such as high-strength FRP and reinforcing bar to bring;
(5) described prestressing force laminated wood wooden frame with creep resistant deforming performance, its production technology is simple, workable;
(6) described prestressing force laminated wood wooden frame with creep resistant deforming performance is rejected and is controlled the intrinsic natural defect knot of wood raw material, rotten, twill, crack, small holes caused by worms and hole in manufacturing process, and member mechanics performance reliability is high.
Description of drawings
Fig. 1 is the preparation method's flow chart with prestressing force laminated wood of creep resistant deforming performance.
Fig. 2 is conventional laminated wood wooden frame schematic cross-section.Wherein 1 is adhesive layer, and 2 is the timber laminate.
Fig. 3 a is the schematic cross-section that has the laminated wood wooden frame of creep resistant deforming performance described in the embodiment 1.
Fig. 3 b is the schematic cross-section that has the laminated wood wooden frame of creep resistant deforming performance described in the embodiment 8.
Fig. 3 c is the schematic cross-section that has the laminated wood wooden frame of creep resistant deforming performance described in the embodiment 9.
Be labeled as among the figure: 1 is the heavily stressed hierarchical organization timber laminate under the compressive region high-moisture percentage state of top, 2 for being cut fast growing wood laminate or the low stress grade timber laminate of distinguishing under the equilibrium moisture content state in the middle part, 3 is the heavily stressed hierarchical organization timber laminate under the low-water-content state of tensile region, bottom, 4 is adhesive layer, 5 is the heavily stressed hierarchical organization timber laminate under the compressive region equilibrium moisture content state of top, the heavily stressed hierarchical organization timber laminate under the equilibrium moisture content state of tensile region, 6 bottom.
The specific embodiment
Below in conjunction with embodiment the present invention is described in further detail.
Embodiment 1
Be the preparation method with prestressing force laminated wood of creep resistant deforming performance such as Fig. 1, the steps include:
(1)
The wood raw material preliminary treatment: according to designing requirement, the processing mode by mechanical sawing to pesudotsuga taxifolia and quick growth poplar wood timber by machinery saw that solution is blocked, subdivision saw lumber and scraping, make the dimension stock of thickness 20mm, width 80mm, length 1000mm.Dimension stock is carried out drying to be processed, with its moisture control in 15% scope, and, knot rotten to the intrinsic natural defect of pesudotsuga taxifolia and quick growth poplar wood wood raw material, twill, crack, small holes caused by worms and hole are rejected and are controlled, and it is carried out stress grading (stress rating numbering mark), stress rating generally adopts mechanical elasticity modulus and mechanical stress to grade.The mechanical elasticity modulus laminate that grades is divided into 9 etc., each etc. average elasticity modulus properties index see Table 1.The stress rating laminate is divided into 6 etc.Mechanical elasticity modulus the grade corresponding relation of laminate grade of laminate grade and mechanical stress that grades sees Table 2.
The table 1 mechanical elasticity modulus laminate pi of strength (Mpa) that grades
| The grade of grading | ME7 | ME8 | ME9 | ME10 | ME11 | ME12 | ME14 | ME16 | ME18 |
| The average modulus of elasticity in static bending | 7000 | 8000 | 9000 | 10000 | 11000 | 12000 | 14000 | 16000 | 18000 |
Table 2 mechanical stress the grade corresponding relation of laminate grade of laminate grade and mechanical elasticity modulus that grades
| The mechanical elasticity modulus is graded | ME8 | ME9 | ME10 | ME11 | ME12 | ME14 |
| Mechanical stress is graded | M10 | M14 | M22 | M26 | M30 | M40 |
Again dimension stock is carried out antiseptic insect-repelling or fire retardant chemistry dipping modification; Then by the mode of artificial drying, carry out moisture gradient control, top compressive region and tensile region, bottom pesudotsuga taxifolia moisture content are adjusted into respectively 14% and 6%, the middle part is cut district's quick growth poplar wood moisture content and is adjusted into 10%;
(2)
The making of glued laminated wood: the timber (dimension stock) to same layer identical moisture content carries out finger spreading, maintenance, laterally pieces together wide and maintenance, finger, piece together wide and twice maintenance operation and all operate in the constant environmental condition of moisture content separately keeping it, when each maintenance finishes, adhesive should solidify finger spreading middle finger tenon end glue-spread 150g/m fully in the member
2, moulding pressure 3.0MPa, pressing time, 5s laterally pieced together wide middle glue-spread 500g/m
2, moulding pressure 0.6MPa, 0.5h prepared top compressive region, tensile region, bottom and middle part and was cut district's laminate pressing time, and adhesive is the phenol-resorcin-formaldehyde resin stick;
(3)
The folded thick pressurization of finger and the wide rear laminate of assembly: it is folded thick that district's laminate assembly is cut at top compressive region, tensile region, bottom and middle part, being cut district's laminate according to top compressive region, tensile region, bottom and middle part disposes respectively, the quick growth poplar wood laminate is configured in the middle part is cut the district, the pesudotsuga taxifolia laminate is configured in top and bottom tension nip.Assembly and gluing all keep bottom tensile region timber laminate moisture content 6%, top compressive region timber laminate moisture content 14% and middle part cut in the constant environmental condition of district's timber laminate moisture content 10% and operated.Under the environmental condition of 18 ℃-22 ℃ of temperature, relative humidity 60%-70%, pressurize at last glue-spread 500g/m in the folded thick pressurization
2, moulding pressure 0.9MPa, pressing time, 2.0h made semi-finished product, and adhesive is the phenol-resorcin-formaldehyde resin stick;
(4)
The semi-finished product maintenance: make the laminated wood wooden frame 18 ℃-22 ℃ of temperature, health to adhesive solidifies fully under the environmental condition of relative humidity 60%-70%, simultaneously final component inside moisture content reaches unanimity, all reach 10%, make glue laminated wood member, the prestressing force laminated wood with creep resistant deforming performance for preparing shown in Fig. 3 a comprises the top compressive region along the wooden frame short transverse, the district is cut at the middle part, tensile region, bottom and adhesive layer, described top compressive region, the district is cut at the middle part and the tensile region, bottom bonds fixed-type by adhesive layer mutually, the described top compressive region that contains, the laminated wood of district and tensile region, bottom is cut at the middle part, the final moisture content of three part timber is identical, the resistance to compression district, top of glue laminated wood member is the heavily stressed hierarchical organization timber laminate 1 under the high-moisture percentage state, the middle part is cut the district and is fast growing wood laminate or low stress grade timber laminate 2 under the equilibrium moisture content state, the tensile region, bottom is the heavily stressed hierarchical organization timber laminate 3 under the low-water-content state, is formed by connecting by adhesive layer 4 between each laminate.
(5)
Performance indications: the glue laminated wood member that adopts this mode to make, to compare with the laminated wood wooden frame that conventional method all adopts quick growth poplar wood timber to make, its bending rigidity has improved more than 60%; Under 20 ℃ of temperature and 65% relative humidity environment, under the load action of 0.3 stress level, the maximum deformation of creep of member has reduced more than 40% after 3 months.The glue laminated wood member that adopts this mode to make all adopts pesudotsuga taxifolia timber to make with conventional method, and the laminated wood wooden frame that laminate is arranged without stress rating and moisture gradient compares, and its bending rigidity has improved more than 10%; Under 20 ℃ of temperature and 65% relative humidity environment, under the load action of 0.3 stress level, the maximum deformation of creep of member has reduced more than 15% after 3 months, and material cost has reduced more than 15%.
(1)
The wood raw material preliminary treatment: according to designing requirement, by processing modes such as mechanical sawings, make the dimension stock of thickness 45mm, width 280mm, length 6000mm, dimension stock is carried out drying to be processed, in 25% scope,, knot rotten to the intrinsic natural defect of wood raw material, twill, crack, small holes caused by worms and hole are rejected and are controlled with its moisture control.Then by stress grading and artificial drying, tensile region and the compressive region pesudotsuga taxifolia moisture content of heavily stressed grade is adjusted into respectively 8% and 15%, the low-grade district's Masson pine timber moisture content of being cut is adjusted into 12%;
(2)
The making of glued laminated wood: the timber to same layer identical moisture content carries out finger spreading, maintenance, laterally pieces together wide and maintenance, finger, piece together wide and twice maintenance operation and all operate in the constant environmental condition of moisture content separately keeping it, when each maintenance finishes, adhesive should solidify finger spreading middle finger tenon end glue-spread 350g/m fully in the member
2, moulding pressure 6.0MPa, pressing time, 20s laterally pieced together wide middle glue-spread 150g/m
2, moulding pressure 1.2MPa, 2h prepared top compressive region, tensile region, bottom and middle part and was cut district's laminate pressing time, and adhesive is polyurethane adhesive;
(3)
The folded thick pressurization of finger and the wide rear laminate of assembly: during the laminate assembly is folded thick, according to pressurized, cut with the tension laminate requirement and disposed respectively, simultaneously moisture content is controlled at respectively the outside (bottom and top) that 8% and 15% pesudotsuga taxifolia laminate is configured in laminated wood, moisture content is the middle part that 12% masson pine laminate is disposed at laminated wood, assembly and gluing all keep tensile region, bottom timber laminate moisture content 8%, top compressive region timber laminate moisture content 15% and middle part cut in the constant environmental condition of district's timber laminate moisture content 12% and operated.Under the environmental condition of 18 ℃-22 ℃ of temperature, relative humidity 60%-70%, pressurize at last glue-spread 150g/m in the folded thick pressurization
2, moulding pressure 0.6MPa, pressing time, 8.0h made semi-finished product, and adhesive is polyurethane adhesive;
(4)
The semi-finished product maintenance: laminated wood wooden frame health to adhesive under the environmental condition of 18 ℃-22 ℃ of temperature, relative humidity 60%-70% is solidified fully, simultaneously final component inside moisture content reaches unanimity, all reach 12%, at last to laminated wood carry out sizing processing, surface scrape polishing, repairing, covering with paint, check, user to sign, the final packaging warehouse-in.；
(5)
Performance indications: the glue laminated wood member that adopts this mode to make, all adopt pesudotsuga taxifolia timber to make with conventional method, and compare without the laminated wood wooden frame that stress rating and moisture gradient are arranged, its bending rigidity has improved more than 10%; Under 20 ℃ of temperature and 65% relative humidity environment, under the load action of 0.3 stress level, the maximum deformation of creep of member has reduced more than 20% after 3 months.
(1)
The wood raw material preliminary treatment: according to designing requirement, by processing modes such as mechanical sawings, make the dimension stock of thickness 35mm, width 140mm, length 3000mm, dimension stock is carried out drying to be processed, with its moisture control in 20% scope, the defectives such as intrinsic rotten, knot, twill, crack and small holes caused by worms to wood raw material are controlled, and stress rating numbering mark.Then by the mode of artificial drying, tensile region and compressive region pesudotsuga taxifolia moisture content are adjusted into respectively 6% and 16%, are cut district's Masson pine timber moisture content and be adjusted into 11%;
(2)
The making of glued laminated wood: the timber to same layer identical moisture content carries out finger spreading, maintenance, laterally pieces together wide and maintenance, finger, assembly maintenance operation wide and twice all operate in keeping the constant environmental condition of its moisture content, when each maintenance finishes, adhesive should solidify finger spreading middle finger tenon end glue-spread 200g/m fully in the member
2, moulding pressure 5.0MPa, pressing time, 10s laterally pieced together wide middle glue-spread 300g/m
2, moulding pressure 1.0MPa, 1h prepared top compressive region, tensile region, bottom and middle part and was cut district's laminate pressing time, and adhesive is the urea-melamine-formaldehyde resin adhesive stick;
(3)
The folded thick pressurization of finger and the wide rear laminate of assembly: the laminate assembly folded thick in, according to pressurized, cut with the tension laminate and dispose respectively, heavily stressed hierarchical organization material is configured in the outside of laminated wood wooden frame simultaneously.Assembly and gluing all operate in keeping the constant environmental condition of its moisture content.Under the environmental condition of 18 ℃-22 ℃ of temperature, relative humidity 60%-70%, pressurize at last glue-spread 300g/m in the folded thick pressurization
2, moulding pressure 1.2MPa, pressing time, 6.0h made semi-finished product;
(4)
The semi-finished product maintenance: laminated wood wooden frame health to adhesive under the environmental condition of 18 ℃-22 ℃ of temperature, relative humidity 60%-70% is solidified fully, and simultaneously final component inside moisture content reaches unanimity, and all reaches 11%;
(5)
Performance indications: the laminated wood wooden frame that adopts this mode to make, to compare with the laminated wood wooden frame that conventional method all adopts Masson pine timber to make, its bending rigidity has improved more than 50%; Under 20 ℃ of temperature and 65% relative humidity environment, under the load action of 0.3 stress level, the maximum deformation of creep of member has reduced more than 30% after 3 months.The glue laminated wood member that adopts this mode to make all adopts pesudotsuga taxifolia timber to make with conventional method, and compares without the laminated wood wooden frame that stress rating and moisture gradient are arranged, its bending rigidity has improved more than 8%; Under 20 ℃ of temperature and 65% relative humidity environment, under the load action of 0.3 stress level, the maximum deformation of creep of member has reduced more than 25% after 3 months.
Implementation is with embodiment 2, difference is that it is raw material that the structural timber of the heavily stressed grade of larch is adopted in top compressive region and tensile region, bottom, the wooden frame middle part is cut the district and is used the structural timber of China fir low stress grade to be raw material, adhesive is trimeric cyanamide-formaldehyde resin, and its performance indications are with embodiment 2.
Implementation is with embodiment 2, and difference is that it is raw material that the structural timber of the heavily stressed grade of Lapland pine is adopted in top compressive region and tensile region, bottom, and the wooden frame middle part is cut the district and used the structural timber of Eucalyptus low stress grade to be raw material, and its performance indications are with embodiment 2.
In the combination to each Influence of production factor, take into account simultaneously under the condition of technological parameter in the preparation, acquisition has the laminated wood of the product parameters such as better bending rigidity, passed through long-term a large amount of experiment, obtain to grasp more technical parameter, carry out optimizing integration of data comparison and each influence factor, slowly obtain adjusting to respectively 7% and 15% at the moisture content of the Southern Pine dimension stock of tensile region, bottom and top compressive region, with the low stress grade as in the middle part of cut the dimension stock in district moisture content be controlled at 11%, implementation is with embodiment 1, its performance indications of laminated wood of preparation are compared with embodiment 1, all can improve 5%-8%.
Embodiment 7
Implementation is with embodiment 6, difference is to adjust to respectively 6.5% and 15.5% as the moisture content of the dimension stock of tensile region, bottom and top compressive region, with the low stress grade as in the middle part of cut the dimension stock in district moisture content be controlled at 11%, its performance indications are compared with embodiment 2, all can improve 5%-12%.
Embodiment 8
As shown in Fig. 3 b, implementation is with embodiment 6, difference be as the moisture content of the dimension stock of tensile region, bottom and top compressive region adjust to respectively 6.5% and 15.5%(i.e. heavily stressed hierarchical organization timber laminate 3 under the low-water-content state of tensile region, bottom and the heavily stressed hierarchical organization timber laminate 1 under the compressive region high-moisture percentage state of top); Heavily stressed hierarchical organization wood 5 under the compressive region equilibrium moisture content state of top is set simultaneously, fast growing wood laminate or the low stress grade timber laminate 2 under district's equilibrium moisture content state cut at heavily stressed hierarchical organization timber laminate 6 under the equilibrium moisture content state of tensile region, bottom and middle part, the moisture content of above-mentioned timber laminate is controlled at 11%, heavily stressed hierarchical organization wood 5 under the compressive region equilibrium moisture content state of described top and the processing of the heavily stressed hierarchical organization timber laminate 6 under the equilibrium moisture content state of tensile region, bottom and making are same as the middle part and are cut fast growing wood laminate or the low stress grade timber laminate 2 of distinguishing under the equilibrium moisture content state, and the heavily stressed hierarchical organization timber laminate 6 under the equilibrium moisture content state of tensile region, bottom and the heavily stressed hierarchical organization timber laminate under the low-water-content state of tensile region, bottom 3 intersect folds thick pressurization, heavily stressed hierarchical organization wood 5 under the compressive region equilibrium moisture content state of top intersects with the heavily stressed hierarchical organization timber laminate 1 under the compressive region high-moisture percentage state of top folds thick pressurization, each laminate connects by adhesive layer 4, its performance indications of laminated wood wooden frame of preparation are compared with embodiment 2, all can improve 8%-12%.
Embodiment 9
As shown in Fig. 3 c, implementation is with embodiment 8, when difference is folded thick pressurization, on the laminated wood wooden frame height successively according to the heavily stressed hierarchical organization timber laminate 3 under the low-water-content state of tensile region, bottom, heavily stressed hierarchical organization timber laminate 6 under the equilibrium moisture content state of tensile region, bottom, fast growing wood laminate or the low stress grade timber laminate 2 under district's equilibrium moisture content state cut at the middle part, heavily stressed hierarchical organization timber laminate 5 under the compressive region equilibrium moisture content state of top and the heavily stressed hierarchical organization timber laminate 1 under the compressive region high-moisture percentage state of top carry out assembly and fold thick, each laminate connects by adhesive layer 4, its performance indications of laminated wood wooden frame of preparation are compared with embodiment 2, all can improve 6%-12%.
Claims (7)
1. have the preparation method of the prestressing force laminated wood of creep resistant deforming performance, the steps include:
(1) log is processed into dimension stock, dimension stock is of a size of thickness 20mm-45mm, width 80 ~ 280mm, length 1000 ~ 6000mm;
(2) to the dimension stock drying with its moisture control in the 15%-25% scope, and it is carried out stress grading;
(3) dimension stock is carried out antiseptic insect-repelling or flame-retardant modified processing;
(4) moisture content as the dimension stock of top compressive region and tensile region, bottom of the heavily stressed grade after will grading is adjusted to respectively in 14% ~ 16% and 6% ~ 8% the scope, with the low stress grade as in the middle part of cut the dimension stock in district moisture content be controlled in 10% ~ 12% scope;
(5) dimension stock of in moisture content 14% ~ 16%, 10% ~ 12% and 6% ~ 8% constant environmental condition district and tensile region, bottom being cut in top compressive region, middle part respectively carries out the finger spreading and laterally pieces together wide, spreading with piece together wide middle grain of wood direction towards consistent, solidify finger spreading middle finger tenon end glue-spread 150g/m fully through gluing pressurization and maintenance to adhesive
2-350g/m
2, moulding pressure 3.0MPa-6.0MPa, pressing time, 5s-20s laterally pieced together wide middle glue-spread 150g/m
2-500g/m
2Moulding pressure 0.6MPa-1.2MPa, 0.5h-2h made top compressive region laminate, tensile region, bottom laminate and middle part and was cut district's laminate pressing time, at spreading with piece together in the wide operation, and in the constant environmental condition of moisture content, carry out keeping it all the time in the late maintaining;
(6) district is cut at top compressive region, middle part and the laminate through-thickness assembly of tensile region, bottom disposes, laminate assembly and gluing all carry out in the constant environmental condition of laminate moisture content separately keeping it, and pressurization and maintenance to adhesive solidify fully under the environmental condition of 18 ℃-22 ℃ of temperature, relative humidity 60%-70%, wherein glue-spread 150g/m in the folded thick pressurization
2-500g/m
2, moulding pressure 0.6MPa-1.2MPa, pressing time 2.0h-8.0h, the laminated wood after maintenance is complete, its inside is the moisture content uniformity everywhere, all reaches 10%-12%;
The surface of (7) carrying out at last laminated wood scrape polishing, repairing, covering with paint and user to sign, the test package warehouse-in.
2. the preparation method with prestressing force laminated wood of creep resistant deforming performance according to claim 1, it is characterized in that, will be in the described step 4 the moisture content as the timber of top pressurized and tensile region, bottom of heavily stressed grade behind the stress rating adjust to respectively in 15% ~ 15.5% and 6.5% ~ 7% scope, with the low stress grade as in the middle part of cut the timber in district moisture content be adjusted into 11%.
3. the preparation method with prestressing force laminated wood of creep resistant deforming performance according to claim 1 and 2, it is characterized in that, it is raw material that the structural timber of pesudotsuga taxifolia, larch, Lapland pine, the heavily stressed grade of Southern Pine is adopted in described top compressive region and tensile region, bottom, and the wooden frame middle part is cut the district and used the structural timber of poplar, China fir, masson pine, the artificial fast growing wood of Eucalyptus or low stress grade to be raw material.
4. the preparation method with prestressing force laminated wood of creep resistant deforming performance according to claim 1 and 2, it is characterized in that the adhesive that described adhesive uses is structure cold curing phenol-resorcin-formaldehyde resin stick, polyurethane adhesive, urea-melamine-formaldehyde resin adhesive stick or trimeric cyanamide-formaldehyde resin.
5. the preparation method with prestressing force laminated wood of creep resistant deforming performance according to claim 4, it is characterized in that, in the described step 2 to the dimension stock drying with after its moisture control is in the 15%-25% scope,, knot rotten to the intrinsic natural defect of dimension stock, twill, crack, small holes caused by worms and hole are rejected and are controlled.
6. the prestressing force laminated wood with creep resistant deforming performance of described method preparation according to claim 1-5, it is characterized in that: described laminated wood comprises along top compressive region, the middle part of wooden frame short transverse is cut district, tensile region, bottom and adhesive layer, the district is cut at described top compressive region, middle part and the tensile region, bottom bonds fixed-type by adhesive layer mutually, describedly contain the glue laminated wood member that top compressive region, middle part are cut district and tensile region, bottom, the final moisture content of three part timber is identical, is 10%-12%.
7. the prestressing force laminated wood with creep resistant deforming performance according to claim 6 is applied to the production of laminated wood wooden frame.
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Application publication date: 20130501 Assignee: LANDIS JIANGSU FEIYA WOOD CO.,LTD. Assignor: Nanjing Tech University Contract record no.: 2017320000078 Denomination of invention: Prestressed laminated wood with creep resistant deformation performance, and preparation method and use thereof Granted publication date: 20141224 License type: Exclusive License Record date: 20170314 |
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