Method for producing construction wood from small-dimensioned wood, and construction wood

Abstract

The invention relates to a method for producing construction wood from small-dimensioned wood, having the steps of: - providing a small-dimensioned wood log which extends in a longitudinal direction and thereby has a substantially circular cross-section and tapers conically in the longitudinal direction, - separating the small-dimensioned wood log into two half logs, each of which is delimited by a central cutting surface and a parallel outer cutting surface, - trimming the two half logs so as to provide two respective flanks, said two flanks being provided so as to run towards each other along the conical shape of the original small-dimensioned wood log, and - producing a single-layer continuous board by placing and gluing the lateral flanks of multiple trimmed half logs together, wherein the half logs are arranged such that the flanks thereof running towards each other lie against each other in a reciprocal manner.

Description

Background of the invention

[0001] The invention relates to a method for producing structural timber from wood, comprising the steps of: providing a small-diameter log extending in a longitudinal direction, having a substantially circular cross-section and tapering conically in its longitudinal direction; splitting the small-diameter log into two half-logs, each bounded by a central cross-sectional surface and an outer cross-sectional surface parallel thereto; trimming the two half-logs with two flanks each, wherein the two flanks are trimmed converging along the conical shape of the original small-diameter log.

[0002] Producing a single-layer continuous panel by placing and gluing several edged half-timbers together with their side edges, wherein the half-timbers are placed against each other with their converging edges - separating at least one strip of panel from the continuous panel with strip edges that are substantially parallel to each other,

[0003] Producing a continuous strip of sheet material by laying several strips of sheet material one after the other and gluing them together, the ends of which are provided with tenons. Such a method is known from document CN 103 372 898 B.

[0004] According to the invention, "small-diameter timber" refers to roundwood from trees with a comparatively small top diameter, particularly between 100 mm and 200 mm. Such small-diameter timber is also known as "paperwood" because it is currently primarily used for paper production. This type of small-diameter timber typically has a trunk length of between 1 m and 6 m, preferably between 2 m and 5 m.

[0005] From WO 2012 / 031854 A1, a method for producing glued wood composite products from long timber of essentially the same length is known, wherein the wood composite products can be joined to form a freely selectable wood composite width and / or wood composite length, wherein essentially each long timber raw material is divided longitudinally into long timber sections and outer slab sections, and after drying and subsequent leveling, a profile is produced on opposite side surfaces of each long timber section. After suitable arrangement and placement side by side, the long timber sections are glued together at their side surfaces to form a wood composite, wherein finger joints are produced at the end faces of each wood composite across its entire wood composite width, and wood composites are repeatedly glued end to end at the respective finger joints until a wood composite product of the selected wood composite length is obtained.

[0006] Further processes are known from CN 103 372 898 B, EP 3 352 986 B1, WO 02 / 085587 A1 and AT 516 697 A1, with which the highest possible material yield from the raw material wood is to be achieved for the production of various end products. Underlying task

[0007] The invention is based on the objective of making low-grade wood of the aforementioned type available for a higher-value use than is the case in papermaking. Inventive solution

[0008] This problem is solved according to the invention by a method for producing structural timber from low-grade timber in the following steps: Providing a small-diameter log extending in a longitudinal direction, having a substantially circular cross-section and tapering conically in its longitudinal direction; splitting the small-diameter log into two half-logs, each bounded by a central cut surface and an outer cut surface parallel to it; trimming the two half-logs with two flanks each, the main planes of which extend substantially perpendicularly or alternatively preferably at an angle between 55° and 77° to the central cut surface, the two flanks being trimmed converging along the conical shape of the original small-diameter log; producing a single-layer continuous panel by placing and gluing several trimmed half-logs together with their lateral flanks, the half-logs being placed against each other with their converging flanks.

[0009] The thickness of the half-timbers is preferably between 45 mm and 90 mm. A stepped thickness depending on the diameter of the processed small-diameter log is particularly preferred: 47 mm (with a top diameter of at least 100 mm), 67 mm (with a top diameter of at least 140 mm), and 87 mm (with a top diameter of at least 180 mm).

[0010] Preferably, when manufacturing the single-layer continuous panel, the edged half-timbers are first dried.

[0011] Furthermore, when manufacturing the single-layer continuous panel, at least one step or profile is advantageously formed in the side flanks of the edged timbers, particularly after the edged timbers have dried. This profile preferably forms a step in an otherwise essentially flat surface, the main plane of which extends obliquely to the central cross-sectional surface. The angle between the central cross-sectional surface and the main plane of this profiled or flank surface is preferably between 55° and 72°, depending on the diameter of the processed small-diameter timber log.

[0012] The inventive method for producing structural timber from low-grade wood further comprises the step of: separating at least one strip of board from the continuous board with strip flanks that are essentially parallel to each other, in particular with a width of between 8 cm and 30 cm.

[0013] Furthermore, the method for producing structural timber from low-grade wood according to the invention is further characterized by the step: producing an endless strip of panels by placing and gluing several strips of panels one after the other, wherein the strips of panels are provided with tenons at their ends.

[0014] Furthermore, the method for producing structural timber from low-grade wood according to the invention also includes the step of planing the continuous strip of panels to a final thickness dimension.

[0015] Finally, the inventive method for producing structural timber from low-grade wood also includes the following step: producing a beam by arranging and gluing several continuous strips of panels, previously cut to a predetermined length, on top of each other.

[0016] The invention also relates to structural timber produced using such a method. Brief description of the drawings

[0017] An exemplary embodiment of the solution according to the invention is explained in more detail below with reference to the accompanying schematic drawings. It shows: Fig. 1 shows an explanation of the work steps of an embodiment of the solution according to the invention, Fig. 2 shows a partial, end-face top view of a small-diameter timber for processing according to the method according to the invention. Detailed description of the exemplary embodiment

[0018] In Fig. 1Figure 16 illustrates an embodiment of a method 10 for producing structural timber 12 from small-diameter timber 14. The method comprises a step 16 in which a small-diameter timber log 18 is provided, extending longitudinally, having a substantially circular cross-section 20, and tapering conically in its longitudinal direction (not shown). The small-diameter timber log 18 preferably has a diameter at the top (thin end) of between 100 mm and 200 mm and / or a diameter at the stave (thick end) of between 124 mm and 224 mm. In step 16, the small-diameter timber log 18 is then further divided into two half-logs 22, each bounded by a central cross-sectional surface 24 and an outer cross-sectional surface 26 parallel to it.

[0019] In step 28, the half-timbers 22 are edged or laterally milled, whereby this edging or milling of the two half-timbers is carried out conically, with two flanks 30 each, the main planes of which extend perpendicular to the central cross-sectional surface 24. The two flanks 30 follow the conical shape of the original small-diameter log 18, converging towards each other.

[0020] The following step 32 then takes place, in which the wood prepared in this way is first dried to a residual moisture content of preferably between 12% and 20%, particularly preferably between 15% and 18%, in order to then be provided in a step 34 with a profiling or stepping 36 in the flanks 30.

[0021] In step 38, the edged and profiled half-timbers 22 are placed alternately against each other with their lateral, converging, profiled flanks 30. Then the half-timbers 22, thus pre-processed, are glued together at their profiled flanks 30 to form a single-layer continuous panel 40.

[0022] From this single-layer continuous plate 40, individual plate strips 44 are then cut off in a step 42, each having strip flanks 46 that are parallel to each other.

[0023] The individual strip flanks 46 are then, in step 48, provided with tenons 50 at their ends, in particular in the form of a longitudinal finger joint, placed one behind the other and then glued together at the tenons 50. In this way, an endless strand or continuous strip of panels 52 is produced from panel strips 44, which is then, in step 54, cut to a predetermined length and planed to a final thickness 56, thereby producing a so-called structural timber or a lamella 58.

[0024] Finally, a beam in the form of a glulam beam 60 (glued laminated timber beam), a duo beam 62, or a trio beam 64 is produced from such lamellae 58 by arranging and gluing them together. Alternatively, so-called cross-laminated timber 66, in particular of the CLT quality, can also be produced in this way.

[0025] The Fig. 2The figure shows a small-diameter log 18 in a top view from the end face, with a top radius 68 and a butt radius 70 indicated. A half-log 22 is formed by means of a saw cut 72, with its central cut surface 24 and its outer cut surface 26 opposite it. Fig. 2 Figure 1 further illustrates an angle 74 mentioned above between a main plane 76 of the step or profiling 36 and the central cross-sectional surface 24. Depending on the diameter of the processed small-diameter log, this angle 74 is advantageously between 55° and 72°, in particular between 60° and 65°. Reference symbol list

[0026] 10. Methods for producing structural timber 12. Structural timber 14. Low-grade timber 16. Step: Preparing and splitting low-grade log 18. Low-grade log 20. Cross section 22. Half-timber 24. Center section 26. Outer section 28. Step: Trimming 30. Side 32. Step: Drying 34. Step: Profiling the sides 36. Stepping or profiling 38. Step: Gluing 40. Single-layer continuous panel 42. Step: Cutting panel strips 44. Panel strips 46. Strip side 48. Step: Dovetailing and gluing panel strips 50. Dovetail 52. Continuous strand or continuous panel strip 54. Step: Cutting to length and planing 56. Final thickness 58. Laminated timber or structural timber 60. Glulam beam 62. Duo beam 64. Trio beam 66 Cross-laminated timber 68 Tap radius 70 Stock radius 72 Saw cut 74 Angle 76 Main plane of the step or profiling

Claims

1. Method (10) for producing structural timber (12) from small-diameter wood (14) with the steps: - Providing a small-diameter wood log (18) which extends in a longitudinal direction, thereby having a substantially circular cross-section (20) and tapering conically in its longitudinal direction, - Splitting the small-diameter wood log (18) into two half-timbers (22), which are each bounded by a central cutting surface (24) and a parallel outer cutting surface (26), - Edging the two half-timbers (22) with two flanks (30) each, wherein the two flanks (30) are edged to run towards each other along the conical shape of the original small-diameter wood log (18), - Producing a single-layer continuous panel (40) by laying together and gluing several edged half-timbers (22) with their lateral flanks (30), wherein the half-timbers (22) are laid together alternately with their tapering flanks (30), - Separating at least one panel strip (44) from the continuous panel (40) with substantially parallel strip flanks (46), - Producing a continuous panel strip (52) by laying one behind the other and gluing several panel strips (44), wherein the panel strips (44) are provided with finger joints (50) at their ends, - Planing the continuous panel strip (52) to a final thickness dimension (56) and - Producing a beam (60, 62, 64) by arranging one above the other and gluing several continuous panel strips (52) previously cut to a predetermined length.

2. Method for producing structural timber from small-diameter wood according to claim 1, wherein in producing the single-layer continuous panel (40), the edged half-timbers (22) are first dried.

3. Method for producing structural timber from small-diameter wood according to claim 1 or 2, wherein in producing the single-layer continuous panel (40), at least one step (36) is formed on the lateral flanks (30) of the edged half-timbers (22), in particular after the drying of the edged half-timbers (22).

4. Structural timber (12) produced according to a method according to any one of claims 1 to 3.

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