FI90370B - Method for production of a log wall - Google Patents

Description

90370

The present invention relates to a method of manufacturing a log wall, in which the logs are treated by drilling a cavity extending longitudinally from end to end of the log into each of them, after which the wall is assembled from a substantially cross section of the logs obtained in this way.

The use of round logs as a wall material is an ancient traditional construction method. Recently, log construction has been applied especially to the manufacture of buildings for holiday homes and similar leisure use 15. The round logs used for construction have generally been solid, substantially intact logs sawn from the tree trunk, stacked on top of each other in the wall. In addition, a method is known in which logs 20 sawn from the frame, convex on one side, are fastened to vertical supports between the abutment logs so that the convex sides of the logs become the outer surfaces of a thermally insulated wall. · - '25 of log parts fixed to the wall as shown above, the convex sides facing outwards or alternatively directly on top of each other.

U.S. Pat. No. 3,969,859 further discloses a method in which a log wall is made of hollow drilled round logs. According to the publication, such hollow logs can be filled with thermal insulation.

Compared to a traditional round log structure using solid logs, the hollow logs have the advantage of lightening the wall structure, as well as the ease of drying the logs, which means both time and energy savings and lower costs. The cavity also prevents the wood from living 90370 2 and logs to improve the appearance of the wall, to make the cavity, simply drilling longitudinally through the log with one reciprocating movement of a drill or similar drilling tool is sufficient.

The object of the present invention is to provide a solution by which a log wall formed from hollow logs can be manufactured at an even lower cost. The method according to the invention is characterized in that it uses logs, the interior of which is at least partially rotten, whereby the rotting wood leaves the logs in connection with the drilling of cavities.

The drilling of cavities according to the invention removes rotting wood from the logs, so that only the healthy wood material of the outer layers of the tree trunk remains in the available hollow logs. In particular, there is a fungal heart rot in the spruce tree, which can extend from the base of the tree to a height of about 6 meters, and the decrease in the value of the logs due to the rot causes a considerable economic loss. Inside, the spruce spruce-20 kit is not suitable as lumber or even for all pulping processes, but has only had the value of firewood. However, they are excellently suitable for the method according to the invention, which means that the material costs of the method remain very low.

Inside, rotten logs can be drilled hollow with bores extending from end to end of the log, whereby the wall is assembled in part or in whole from tubular hollow logs 30 closed in its surface. Drilling of the cavity can take place, for example, with a tubular drilling tool, the outer surface of which is provided with spiral grooves for removing the resulting debris. However, it is also possible to make a longitudinal piston on the side of the log first, which facilitates the assembly of the wall, after which the drilling tool is aligned with the log so that a narrow longitudinal gap is formed at the chamfer, through which the resulting cavity remains open. This ensures that the debris generated in the drilling step can escape through the gap, in which case the above-mentioned threads are not required in the drill. In the finished log wall, the gap remains hidden at the seam point between the overlapping logs, so that it does not affect the appearance of the wall.

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According to the invention, it is possible to manufacture a log wall using exclusively hollow logs to be stacked. Another alternative is to use solid wood logs in addition to the hollow logs for the wall, preferably so that the hollow salmon logs and the closed logs alternate vertically in the wall. The advantage of the latter solution is that the chamfers required for assembling the wall can be made only on logs of solid wood and the hollow logs do not need to be shaped in any way except for the drilling of the cavity. Since the chamfers reduce the wall thickness of the hollow logs and lower their strength, the overall wall strength is improved by using solid logs in this way.

20 The hollow logs can be connected longitudinally to each other at the joints by means of connecting pieces arranged inside the logs. The method is then independent of the length of the individual logs used, and the inside log can then be drilled into a hollow log exactly from the length at which the -V-25 rot occurs. The joints between the logs can be made in a factory where large, possibly: whole-wall elements can be assembled from the logs, which can be moved and transported to the construction site due to the lightening of the structure provided by the cavities.

30. . As already mentioned above, the cavities drilled in the logs allow the wall to be thermally insulated. This is done by filling the cavities with a suitable insulating material, such as pulp or mineral wool or polyurethane. On the other hand, it must be stated that the wall has thermal insulation even without insulation, since the air contained in the voids left empty also acts as a relatively good insulator.

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The invention also relates to the use of internally decayed logs for the production of a log wall. This is done by drilling a longitudinal end-to-end cavity in each log, whereby the decaying wood leaves the logs during drilling 5, after which the wall is assembled from some or all of the obtained substantially circular cross-section hollow logs.

The log wall made according to the invention is particularly suitable as an outer wall, but possibly also as an inner wall for holiday cottages, other leisure buildings, storage buildings, cattle shelters, mobile barracks and other buildings which can be made of logs. In addition, individual wall-15 walls, such as fences, obstacles, e.g., noise barriers, and the like, may be considered.

In these in particular, the parallel logs can also be in a vertical or oblique position.

The invention will now be described in more detail by way of example with reference to the accompanying drawings, in which Figures 1-3 show step by step drilling of a cavity into a round log, in which a second, thinner log is released as a result of drilling, Figure 4 shows step by step the manufacture of a hollow log wall according to an embodiment Fig. 5 shows the construction of a wall of hollow logs according to another embodiment of the invention in steps, Fig. 6 shows the production of a log wall in steps, in which the hollow logs and solid wood logs alternate in the wall, and Fig. 7 shows a joint between two longitudinally arranged hollow logs.

: "35 According to Figures 1-3, the drilling of a round log 1 into a hollow, tubular hollow log 2 takes place by means of a tubular drilling tool 3 rotating about its own axis, which in a linear, reciprocating motion penetrates the longitudinal direction! - .90370 The casing of the tubular drilling tool 3 may be about 3-5 mm thick, its tip 4 may have a serrated edge to facilitate penetration, and its outer surface is provided with helical grooves 5 which remove the bore 6 generated during drilling outside the log 1. As a result of drilling 1, not only a tubular hollow log 2 is obtained, but also a thinner log 7 detached from inside it, which is seen in Fig. 3 inside the hollow log.

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When drilling, care must be taken to ensure that the decaying wood material inside the log remains in the thinner log 7 to be drilled, in which case the resulting hollow log 2 is entirely of healthy wood. The drilled log 7 can still be used as firewood. Alternatively, however, a drill can be used in the drilling, which at one time turns the log 1 more or less into the interior of the rot, leaving only a tubular, healthy hollow log 2.

In the embodiment of the invention according to Figure 4, the raw material is round logs 1, the core 8 of which is at least partly rotten from wood. Such logs 1 are obtained in particular from the thick base parts of spruce logs, although rot may also occur in, for example, pine, spruce, birch, wound, oak and beech, which can therefore also be used in the invention. According to FIG. The log wall 11 is formed by stacking the hollow logs 2 obtained in a horizontal position on top of each other with the flaps 9 facing each other and suitably sealing the flaps between the flaps with an insulating material. Figure 4 also shows the cavities 10 filled with thermal insulation: 12, such as pulp or mineral wool. It would also be possible to leave the cavities 10 in the wall 11 empty, whereby the air in them would act as thermal insulation.

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The embodiment of the invention according to Fig. 5 differs from that shown in Fig. 4 only in that the cavity 10 is first drilled in the cavity 10 and the resulting cavity log 2 is then formed with a longitudinal, curved chamfer 9 with a radius of curvature corresponding to the radius of curvature. The advantage of this solution is that each log only needs to be chamfered at one point.

Figure 6 shows an embodiment of the invention, in which the log wall 11 is formed partly from tubular hollow logs 2 and partly from logs 13 of healthy solid wood, which can be of any kind of wood. The hollow log 2 is obtained according to Fig. 5 by drilling from the inside a rot from the round log 1, while instead of the cavity 10 15, longitudinal, curved chamfers 9 are made on each side of the log for the healthy, closed log 13. In this case, no hollows or chamfers are required in the hollow log 2, which to some extent weakens the strength of the hollow log. In the wall 11, the hollow logs 2 provided with thermal insulation 12 and the solid logs 13 are stacked 20 on top of each other so that the hollow logs rest on the chamfers 9 in the closed logs.

It should be noted that the log walls 11 shown in Figures 4 to 6 must be provided with vertical support members, for example embedded in vertical boreholes, which are, however, not known per se and are irrelevant to the invention, in order to ensure their cohesiveness.

Fig. 7 shows a joint by means of which a hollow log 2 can be joined to one another in the longitudinal direction in a log wall according to the invention. According to the figure, the connecting member is a body 14 with a thinner log, the outer diameter of which substantially corresponds to the inner diameter of the cavities 10 of the hollow logs 2. The connecting cap ... 35 pale 14 then holds the hollow logs 2 in place solely on the compression it exerts.

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It will be clear to a person skilled in the art that the various embodiments of the invention are not limited to the examples presented, but may be within the scope of the appended claims. For example, the cavities 10 in the logs allow the logs to be connected longitudinally in succession in other ways than by means of the press-fit connection piece 14 according to Fig. 7. A finger joint known per se is also possible as a jointing method for hollow logs. It is also possible that, for example, the procedure according to Fig. 5 is modified 10 so that a longitudinal, curved bevel 9 is first formed in the log 1 and then a cavity 10 is drilled in the log so that the drilling line intersects the bevel approximately along its center line. In this way, a narrow longitudinal gap is provided, through which the debris generated in the drilling of the cavity can escape. In the finished wall 11, the gaps are left between the overlapping logs so that they do not affect the appearance of the wall. It is further possible that the logs are lined up in a vertical or even inclined position on the wall, which may be the case, for example, in noise barriers.

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Claims (4)

A method of producing a log wall (11), wherein the logs (1) are processed by drilling each one longitudinally from one end of the log to the other extending head space (10), after which the wall ( 11) is assembled partially or in whole by the extracted material, in cross-section, substantially annular heel stock (2), characterized by the use of logs (1) in the process, the interior of which (at least) is at least partially grouted, the darkened wood is removed from the logs in connection with the drilling of the headroom (10). 2. A method according to claim 1, characterized in that for the wall (11), in addition to the shingles (2), also made of solid wood consisting of shingles (13), preferably so that there are alternating shelves and solid shelves in the vertical direction of the wall. Method according to claim 1 or 2, characterized in that the head cavities (10) drilled into the logs (2) are filled with a thermal insulation material (12), such as e.g. cellulose or mineral wool or polyurethane. Use of the interior grouted logs (1) for the provision of a log wall (11), characterized in that a tile is drilled longitudinally from one end of the log to the other extending head space (10), wherein the grout the wood is removed from the logs in connection with the drilling, and that the wall is partially or wholly assembled by the extracted, substantially cross-sectional, hollow logs (2).