CN110614681A - Method for preparing composite staggered laminated timber by adopting bamboo laminated timber and standard timber - Google Patents

Abstract

A method for preparing composite cross-laminated lumber by using bamboo glulam and standard lumber, characterized in that: bamboo glulam laminates (1) and wooden standard lumber laminates (2) are assembled at 0° to 180°, using Adhesive (3) connects adjacent laminates, and applies pressure on the upper surface and side of the composite cross-laminated lumber. When the adhesive (3) solidifies and continues to pressurize for a certain period of time, the applied pressure is removed, and finally the rough board is sent to the cutting After the workshop is processed, it is packaged and put into storage. The present invention adopts bamboo laminated wood and standard timber composed of bamboo slices to prepare composite cross-glued wood, aiming at improving various mechanical performance indexes of composite cross-glued wood by utilizing the good mechanical properties of bamboo glued wood.

Description

A method for preparing composite cross-laminated lumber by using bamboo glulam and gauge lumber

technical field

The invention relates to a method for preparing composite cross-laminated lumber by using bamboo glulam and standard lumber, which is applied to beams, plates and columns in wooden structures and bridges, and belongs to the field of structural engineering.

Background technique

Cross-laminated timber, also known as cross-laminated timber (CLT for short), is a new type of prefabricated engineered wood product that is popular all over the world. Glued with structural adhesive or nailed. my country has abundant bamboo resources, and the bamboo engineering materials made of bamboo are increasing in practical engineering applications. Laminated veneer bamboo (LVB for short) is one of the bamboo engineering materials. Compared with other bamboo engineering materials, it not only has good mechanical properties, but also is more environmentally friendly. For example, the Chinese patent "201822150276.4" published "a bamboo-wood composite cross-laminated wood made of bamboo strips". Bamboo-wood composite cross-laminated wood is prepared together with wood materials, and the composite cross-laminated wood has the characteristics and advantages of both bamboo and wood. Similarly, the present invention proposes a composite cross-glued wood made of bamboo laminated lumber and wooden standard lumber, which is composed of bamboo slices. In addition to the mechanical properties of bamboo and wood, it is more environmentally friendly and beautiful.

Contents of the invention

The present invention adopts bamboo laminated wood and standard timber composed of bamboo slices to prepare composite cross-glued wood, aiming at utilizing the good mechanical properties of bamboo glued wood to improve various mechanical performance indexes of composite cross-glued wood.

In order to achieve the above object, the present invention adopts the following technical solutions: a method for preparing composite cross-laminated lumber using bamboo glulam and standard lumber, characterized in that: bamboo glulam laminate 1 and wooden standard lumber laminate 2 are separated by 0° ~ 180° for blank assembly, using adhesive 3 to connect adjacent laminates, and applying pressure on the upper surface and side of the composite cross-laminated lumber. After being sent to the cutting workshop for processing, it is packaged and stored in the warehouse, which specifically includes the following steps:

1) Bamboo glulam and standard lumber processing: Arrange the bamboo pieces that make up the bamboo glulam in a certain form, cut and sand the surface after sizing and pressure curing, and cut the standard lumber into a certain length And sanding to a certain thickness, the thickness of the bamboo glulam laminate 1 is less than or equal to the thickness of the wooden standard timber laminate 2;

2) Blank assembly and gluing: Bamboo glulam laminates 1 and wooden standard timber laminates 2 are assembled at 0° to 180°, and wooden standard timber laminates 2 are assembled at certain intervals, and each layer of laminates Apply adhesive 3 after laying;

3) Pressurization: Pressurize it after forming the billet and applying glue, and adopt one of the cold pressing process and the hot pressing process;

4) Cutting and packaging into storage: Send the blank board to the cutting workshop for processing and then packaging into storage.

The method for preparing composite cross-laminated lumber by using bamboo glulam and standard lumber is characterized in that the bamboo glulam laminate 1 is bamboo glulam laminated on the side of bamboo slices, and the side laminated layers of bamboo slices and flat laminated layers are successively interlaced bamboo A type of laminated lumber, each layer of bamboo sheets constituting the bamboo glulam is placed in the same direction of bamboo fibers, and the angle of the bamboo fibers of the bamboo sheets in adjacent layers is 0° to 180°.

The method for preparing composite cross-laminated lumber by using bamboo glulam and standard lumber is characterized in that the thickness of the bamboo slices constituting the bamboo glulam laminate 1 is 2 mm to 10 mm, and the width is 5 mm to 25 mm.

A method for preparing composite cross-laminated lumber using bamboo glulam and standard lumber is characterized in that the surface layer of the composite cross-laminated lumber is a bamboo glulam laminate 1, and the remaining layers are wooden standard lumber laminates 2, The angle between the bamboo fiber in the surface layer of the adjacent bamboo glulam layer 1 and the wood fiber in the wooden standard wood layer 2 is 0°～180°, and the included angle between the wood fiber in the adjacent wooden standard wood layer 2 is 0°～180° °.

The method for preparing composite cross-laminated lumber by using bamboo glulam and gauge lumber is characterized in that the adhesive 3 is a phenolic adhesive (PRF), a polyurethane adhesive (PUR), an isocyanate adhesive (EPI) One of them, the effective bonding area between the laminates is greater than or equal to 80% of the total contact area between the laminates.

The present invention has following beneficial effect:

(1) Green and environmental protection, beautiful appearance;

(2) Give full play to the mechanical properties of bamboo and wood;

Description of drawings:

Fig. 1 is the production method flowchart of the present invention;

Fig. 2 is a three-dimensional schematic view of the composite cross-laminated lumber of the present invention;

Fig. 3 is a schematic view of the end face of Embodiment 1 of the present invention;

Fig. 4 is the schematic diagram of the end face of Embodiment 2 of the present invention;

Fig. 5 is a schematic view of the end face of Embodiment 3 of the present invention;

Fig. 6 is a schematic view of the end face of Embodiment 4 of the present invention;

Fig. 7 is a schematic view of the end face of Embodiment 5 of the present invention;

Fig. 8 is a schematic view of the end face of Embodiment 6 of the present invention;

Detailed ways:

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation of the present invention will now be described with reference to the accompanying drawings 1 to 2 . The present invention adopts bamboo laminated wood and standard timber composed of bamboo slices to prepare composite cross-glued wood, aiming at utilizing the good mechanical properties of bamboo glued wood to improve various mechanical performance indexes of composite cross-glued wood.

In order to achieve the above object, the present invention adopts the following technical solutions: a method for preparing composite cross-laminated lumber using bamboo glulam and standard lumber, characterized in that: bamboo glulam laminate 1 and wooden standard lumber laminate 2 are separated by 0° ~ 180° for blank assembly, using adhesive 3 to connect adjacent laminates, and applying pressure on the upper surface and side of the composite cross-laminated lumber. After being sent to the cutting workshop for processing, it is packaged and stored in the warehouse, which specifically includes the following steps:

1) Bamboo glulam and standard lumber processing: Arrange the bamboo pieces that make up the bamboo glulam in a certain form, cut and sand the surface after sizing and pressure curing, and cut the standard lumber into a certain length And sanding to a certain thickness, the thickness of the bamboo glulam laminate 1 is less than or equal to the thickness of the wooden standard timber laminate 2;

2) Blank assembly and gluing: Bamboo glulam laminates 1 and wooden standard timber laminates 2 are assembled at 0° to 180°, and wooden standard timber laminates 2 are assembled at certain intervals, and each layer of laminates Apply adhesive 3 after laying;

3) Pressurization: Pressurize it after forming the billet and applying glue, and adopt one of the cold pressing process and the hot pressing process;

4) Cutting and packaging into storage: Send the blank board to the cutting workshop for processing and then packaging into storage.

Bamboo laminated lumber 1 is one of bamboo laminated laminated bamboo laminated timber, side laminated bamboo laminated laminated laminated laminated bamboo laminated timber, each layer of bamboo laminated bamboo laminated wood is placed in the same bamboo fiber direction, The angles of the bamboo fibers of the bamboo slices in adjacent layers are 0°-180°. The thickness of the bamboo sheets constituting the bamboo glulam laminate 1 is 2 mm to 10 mm, and the width is 5 mm to 25 mm. The surface layer of the composite cross-laminated lumber is bamboo glulam plywood 1, and the rest of the layers are wood-sized lumber plywood 2. is 0°～180°, and the included angle of wood fibers in the adjacent wooden gauge lumber laminates 2 is 0°～180°. Adhesive 3 is one of phenolic adhesive (PRF), polyurethane adhesive (PUR), and isocyanate adhesive (EPI), and the effective bonding area between the laminates is greater than or equal to the total contact area between the laminates 80% of.

Specific embodiment one:

As shown in Figure 3, bamboo glulam laminate 1 and wooden standard lumber laminate 2 are orthogonally formed into blanks, and there are three layers in total. The adhesive joins adjacent laminates. The material used for the bamboo glulam laminate 1 is pure side-pressed bamboo glulam (2 layers). The width of the bamboo sheets constituting the bamboo glulam is 15mm, and the thickness is 6mm. The fibers in the two layers of side-pressed bamboo sheets are parallel to each other, and the fibers of the outermost flat-pressed bamboo sheets are parallel to the length direction of the cross-laminated lumber. The material used for the wooden specification timber laminate 2 is SPF specification timber, and there is no interval between the SPF specification timber. After sanding, the thickness of the first layer of the bamboo glulam laminate is 18mm, and the thickness of the second layer of the wood-standard lumber is 35mm.

Specific embodiment two:

As shown in Figure 4, the bamboo glulam laminate 1 and the wooden standard lumber laminate 2 are assembled orthogonally, and there are three layers in total. The adhesive joins adjacent laminates. The material used for the bamboo laminated board 1 is bamboo laminated layer and flat laminated layer successively interlaced bamboo laminated wood (3 layers), wherein the side-pressed bamboo slices are located at the core layer of the bamboo laminated board 1 . The width of the bamboo sheets constituting the bamboo glulam is 15mm, and the thickness is 6mm. The fibers in the three layers of bamboo sheets are parallel to each other, and the fibers of the outermost flat-pressed bamboo sheets are parallel to the length direction of the cross-laminated lumber. The material used for the wooden gauge timber laminate 2 is larch gauge timber, and there is no interval between the larch gauge timber. After sanding, the thickness of the first layer of the bamboo glulam laminate is 18mm, and the thickness of the second layer of the wood-standard lumber is 30mm.

Specific embodiment three:

As shown in Figure 5, the bamboo-glued lumber laminate 1 and the wood-sized lumber laminate 2 are assembled orthogonally, and there are three layers in total. The adhesive joins adjacent laminates. The material used for the bamboo laminated board 1 is bamboo laminated layer and flat laminated layer successively interlaced bamboo laminated wood (3 layers), wherein the side-pressed bamboo slices are located at the core layer of the bamboo laminated board 1 . The width of the bamboo sheets constituting the bamboo glulam is 15 mm, and the thickness is 6 mm. The fibers in the three layers of bamboo sheets are perpendicular to each other, and the fibers of the outermost flat-pressed bamboo sheets are parallel to the length direction of the cross-laminated lumber. The material used for the wood gauge timber laminate 2 is hemlock gauge timber, and there is no interval between the hemlock gauge timber. After sanding, the thickness of the first layer of the bamboo glulam laminate is 18mm, and the thickness of the second layer of the wood-standard lumber is 35mm.

Specific embodiment four:

As shown in Figure 6, the bamboo-glued lumber laminate 1 and the wooden standard lumber laminate 2 are assembled orthogonally, with a total of five layers. Phenolic adhesives join adjacent laminates. The material used for the bamboo laminated board 1 is bamboo laminated layer and flat laminated layer successively interlaced bamboo laminated wood (3 layers), wherein the side-pressed bamboo slices are located at the core layer of the bamboo laminated board 1 . The width of the bamboo sheets constituting the bamboo glulam is 15mm, and the thickness is 6mm. The fibers in the three layers of bamboo sheets are parallel to each other, and the fibers of the outermost flat-pressed bamboo sheets are parallel to the length direction of the cross-laminated lumber. The material used for the wooden gauge timber laminate 2 is larch gauge timber, and there is no interval between the larch gauge timber. After sanding, the thickness of the first layer of the bamboo glulam laminate is 18mm, and the thickness of the second layer of the wood-standard lumber is 30mm.

Specific embodiment five:

As shown in Figure 7, the bamboo-glued lumber laminate 1 and the wooden standard lumber laminate 2 are assembled orthogonally, and there are 5 layers in total. Isocyanate adhesives join adjacent laminates. The material used for the bamboo glulam laminate 1 is the side-laminated layer of bamboo slices and the flat laminated layers interlaced bamboo glulam (5 layers), wherein the side-pressed bamboo slices are located in the even-numbered layers of the bamboo glulam laminate 1 . The width of the bamboo sheets constituting the bamboo glulam is 15mm, and the thickness is 5mm. The fibers in the five layers of bamboo sheets are parallel to each other, and the fibers of the outermost flat-pressed bamboo sheets are parallel to the length direction of the cross-laminated lumber. The material used for the wood gauge timber laminate 2 is hemlock gauge timber, and there is no interval between the hemlock gauge timber. After sanding, the thickness of the first layer of the bamboo glulam laminate is 18mm, and the thickness of the second layer of the wood-standard lumber is 35mm.

Specific embodiment six:

As shown in Figure 8, the bamboo-glued lumber laminate 1 and the wooden standard lumber laminate 2 are assembled orthogonally, and there are 5 layers in total. Isocyanate adhesives join adjacent laminates. The material used for the bamboo glulam laminate 1 is the side-laminated layer of bamboo slices and the flat laminated layers interlaced bamboo glulam (5 layers), wherein the side-pressed bamboo slices are located in the even-numbered layers of the bamboo glulam laminate 1 . The width of the bamboo sheets constituting the bamboo glulam is 15 mm, and the thickness is 5 mm. The fibers of the five layers of bamboo sheets are orthogonal to each other, and the fibers of the outermost flat-pressed bamboo sheets are parallel to the length direction of the cross-laminated lumber. The material used for the wood gauge timber laminate 2 is hemlock gauge timber, and there is no interval between the hemlock gauge timber. After sanding, the thickness of the first layer of the bamboo glulam laminate is 18mm, and the thickness of the second layer of the wood-standard lumber is 35mm.

Claims (5)

1. A method for preparing a composite staggered laminated timber by adopting bamboo laminated timber and standard timber is characterized by comprising the following steps: the method comprises the following steps of assembling a bamboo laminated wood laminate (1) and a wood specification material laminate (2) at an angle of 0-180 degrees, connecting adjacent laminates by using an adhesive (3), applying pressure on the upper surface and the side surface of a composite staggered laminated wood, removing the applied pressure after the adhesive (3) is cured and continuously pressurized for a certain time, and finally sending a blank plate into a cutting workshop for processing and then packaging and warehousing, wherein the method specifically comprises the following steps:

1) processing the bamboo laminated wood and the standard wood: arranging bamboo chips forming the bamboo laminated wood in a certain form, cutting the bamboo chips after sizing and pressure curing processes, sanding the surface of the bamboo chips, cutting the standard wood into a certain length, sanding the standard wood to a certain thickness, wherein the thickness of the bamboo laminated wood laminated plate (1) is less than or equal to that of the wood standard wood laminated plate (2);

2) assembling and sizing: the laminated bamboo board (1) and the laminated wood board (2) are assembled at an angle of 0-180 degrees, the laminated wood board (2) is assembled at certain intervals, and an adhesive (3) is applied after each layer of laminated board is laid;

3) pressurizing: after assembling and gluing, pressurizing the blank by adopting one of a cold pressing process and a hot pressing process;

4) cutting, packaging and warehousing: and (4) conveying the blank plate into a cutting workshop for processing, packaging and warehousing.

2. The method of manufacturing a composite cross laminated lumber using a bamboo laminated lumber and a gauge lumber according to claim 1, wherein the laminated board (1) of the bamboo laminated lumber is one of a bamboo chip side-pressed bamboo laminated lumber, a bamboo chip side-pressed layer and a laminated layer sequentially cross the bamboo laminated lumber, each layer of bamboo chips constituting the bamboo laminated lumber are placed in the same bamboo fiber direction, and the angle of the bamboo fiber of the bamboo chip in the adjacent layer is 0 ° to 180 °.

3. The method for preparing the composite cross laminated timber using the bamboo laminated timber and the standard timber as claimed in claim 1, wherein the thickness of the bamboo chips constituting the laminated timber board (1) is 2mm to 10mm and the width is 5mm to 25 mm.

4. The method for preparing the composite staggered laminated wood by using the bamboo laminated wood and the standard wood according to claim 1, wherein the surface layer of the composite staggered laminated wood is a bamboo laminated wood board (1), the rest layers are wood standard wood boards (2), the included angle between the bamboo fiber on the surface layer of the adjacent bamboo laminated wood board (1) and the wood fiber in the wood standard wood board (2) is 0-180 degrees, and the included angle between the wood fiber in the adjacent wood standard wood board (2) is 0-180 degrees.

5. The method for preparing the composite cross laminated timber using the bamboo laminated timber and the gauge timber as claimed in claim 1, wherein the adhesive (3) is one of a phenol formaldehyde adhesive (PRF), a polyurethane adhesive (PUR) and an isocyanate adhesive (EPI), and the effective bonding area between the laminated timber is 80% or more of the total contact area between the laminated timber.