SE1330098A1 - POST - Google Patents

Abstract

A post (1) has at least two pipe sections (1a) designed as cylindrical hollow tubes of laminated wood, said pipe sections (1a) having an inner cylindrical cavity with inner diameter D and where the pipe sections (1a) are joined by their longitudinal ends. be glued to each other, and where a splice tube (2), also designed as a cylindrical hollow tube of laminated wood but with an outer diameter D, is inserted into the inner cylindrical cavity in each end of the at least two tube sections glued to each other. (Fig. 3)

Description

10 15 20 25 30

Preferably, the surfaces of the joint pipe abutting the inner walls of respective pipe section, in which the splice pipe is inserted, towards each other.

The invention also relates to a method for manufacturing the post according to the invention.

The method is described in detail in the description of embodiments below.

According to one aspect of the invention, a post having features according to the device specified in the independent claim 1.

According to a further aspect of the invention, a method for a method is presented to produce the post, where the method is specified in the independent claim 7.

Further embodiments of the invention are presented in the dependent claims.

A post made according to the invention aspect has many advantages. The pipe sections can produced in standard lengths, for example Zm lengths. This allows a user to hold one bearings of such pipe sections and, if necessary, assemble posts, for e.g. power lines in the desired length, where then 8m, 10m, or 12m posts are made based on a need that arises. The finished posts are also light in that they do not contain much material. For example, two men can carry and travel a lighter variant of one on their own post without mechanical assistance. Because the glue you use impregnates the veneer layers the wood in the post is also given preservative properties. A post made according to the invention is estimated to be in use for at least 30 years even when its lower part is buried in the ground.

Furthermore, posts of the type described can replace those currently usually creosote-impregnated solid poles that are used as poles for electricity and telephone lines and thereby achieve minor impacts on the environment. A further advantage of the post according to the invention is that it has very strong joints thanks to the joint pipes used in the joints between the pipe sections. This results in a significantly higher stability and less risk of breakage joints compared to posts according to the prior art as described in patent specification CA 1325096, where pipe sections are glued to each other edge to edge. 10 15 20 25 30 DESCRIPTION OF FIGURES Pig. 1 shows in a schematic view a complete post in 4 sections according to the invention.

Fig. 2 illustrates in a perspective view a detail of a joint of a pipe section where a joint pipe is inserted.

Fig. 3 illustrates how an additional pipe section is threaded on top of the protruding splice pipe in Fig. 2 to provide a joint between two pipe sections.

Fig. 4 shows how two halves of a pipe section are glued to each other.

Pig. 5 shows in a cross section how a pipe section is built up of inner and outer pipe parts glued towards each other, where it is also apparent that the longitudinal joint of the outer pipe part is offset 90 degrees in relation to the longitudinal joint of the inner pipe part.

Fig. 6 shows the corresponding joining as in Fig. 4, but where longitudinal contact surfaces between pipe halves are provided with fingers.

Fig. 7 illustrates the polar displacement of longitudinal adhesive joints when outer and inner pipe parts are made with quartz sections of wood laminate.

Fig. 8 illustrates how the layered layers of thin veneer are compressed by pressing tools to forming pipe halves into said pipe parts Fig. 9 shows two pipe halves for an outer pipe part and two pipe halves for an inner pipe part and how these glued to each other using press tools.

Fig. 10 illustrates a complete post joined by pipe sections by means of finger joints and where also the joint pipes that are inside the post are illustrated on the side.

DESCRIPTION OF EMBODIMENTS

In the following, a number of embodiments of the invention are described with the aid of the appended ones the drawings. The drawings only schematically show the principle of the invention and do not claim to scale to show some proportions between different elements of this.

Figure 1 shows a complete post 1 according to the invention. The exemplary post according to the figure is composed of four pipe sections 1a. The post can be made in the desired length by, for example, joining 3 or 5 pipe sections 1a.

The pipe sections 1a consist of cylindrical pipes of laminated wood. The lamination has achieved by gluing a number of layers of veneer together to form the pipe section 1a 10 l5 20 25 30 in the manner described below. As mentioned, it extends along the inner one of the pipe sections 1a longitudinal cylindrical cavity. The pipe sections 1a have an inner diameter D.

[0015] i.e. they consist of hollow cylindrical tubes of laminated wood. The splice tubes 2 have an outer diameter D.

Splice pipes 2 are designed and constructed in a manner corresponding to the pipe sections 1a,

In the manufacture of a pipe section 1a, its longitudinal ends have been flattened perpendicular to the longitudinal direction. In a variant of the design of the post, the ends of the pipe sections are milled to be fitted with finger mills that fit into each other so that glued finger joints can achieved, as described below. Figures 2 and 3 illustrate how pipe section grinding is joined. A splice tube 2 is inserted approximately in its half at one end of a first pipe section 1a in its cylindrical cavity with the diameter D, which diameter is the same as the outer diameter D of the splice tube 2. A second tube section 1a is then threaded onto the part of the splice tube. the pipe protruding from the first pipe section 1a, until the first and second pipe sections ends are close together. The joint pipes 2 can be shorter than the pipe sections 2 and however, provide the post that is formed with sufficient stability. The splice tubes 2 may preferably be glued to the inner surfaces of the pipe sections 1a where the joint pipes and pipe section 1a abut each other. A joint is made in the same way as described for each additional pipe section added to the post. A splice pipe 2 can of course be of the same length as a pipe section la. Such a length of the joint pipe 2 may be preferable at, for example, the lowest of the post 1 joint, whereby the post 1 is given a greater lateral stability when it is erected. Honorably splice pipe 2 is used which has the same length as a pipe section so that the splice pipes will be in it closest to each other end to end. The adhesive used is preferably one MUF glue (Melamine Urea Eormaldehyde - glue).

A method for producing a first variant of the post according to the invention described in the following. Figure 8 describes a first press tool 3 with a longitudinal semi-cylindrical depression. In this depression, the desired number of layers of veneer 4 are placed with, for example, 2 mm layer thickness. The alignment of the layers of veneers can preferably crossed between different layers to give increased bearing capacity of the pipe wall. According to the example, one is used number of layers so that the wall thickness d of the pipe section becomes in the order of 25 mm (see Fig. 5). Glue applied to each layer except a middle layer. When all veneer layers have been placed, move one second half-cylinder shaped press tool 5 against the recess in the first press tool 3. It the first 3 and the second 5 press tool are moved towards each other with large forces F and presses 10 l5 20 25 30 thus the veneer layers 4 against each other so that they assume the shape, a semi-cylindrical shell, which created in the space between the two pressing tools 3 and 5. During pressing, the veneer layers 4 in a known manner (for example by means of high-frequency technology and / or contact heat) to accelerate the curing of the adhesive between the veneer layers. When the glue is sufficiently hardened For example, a blank for a semi-cylindrical shell forming a wood laminate can be taken out of the mold 7.

Said shell can be divided into two longitudinal parts, since a middle layer of veneer has not been ironed with glue and thus an outer and an inner part of the shell can be detached from each other. Hereby formed, after flattening the blank along a diametrical plane, a first inner tube half Sa and a first outer tube half 9a (Fig. 4). Correspondingly, a second inner tube half Sb and a second outer half of the tube 9b. In order to finally produce a complete pipe section 1a, a press liner 10 according to Figure 9. This press mold 10 consists of a first press die 10a and a second press die 10b, where both of these have opposite and corresponding half-cylindrical depressions nings. In this mold 10 a complete pipe section 1a with glue applied between it is placed the abutment surfaces Sa, Sb of the inner pipe part resp. abutment surfaces of the outer pipe part 9a, 9b. Glue- the operation is preferably carried out in advance in a cradle, where glue is applied to the inner surface of the second outer surface. tube half 9b, after which the two inner tube halves Sa, Sb are placed against each other as in figure 4 shows inside the second outer half of the tube 9b. Glue can also be applied to the Sa of the two inner tube parts, Sb longitudinal edges. The inner tube halves Sa, Sb are rotated about 90 degrees relative to the outer half of the tube 9b along their common longitudinal axis. Then apply glue the edges between the outer tube halves 9a, 9b and the inside of the first outer tube 9a, after which this first outer tube half 9a is laid over the inner tube halves Sa, Sb. After glue has been applied surfaces and all pipe halves brought together, as mentioned, the pipe section 1a is placed therefor hardening, heating and pressing in the mold 10. The upper press die 10a is applied over the fittings. A pressure P is applied across the press dies 10a and 10b. An internal press tool ll is inserted inside the cavity formed between the inner tube halves Sa, Sb. This internal press tools are actuated by a pneumatic pressure source to expand toward the inside of the inner tubular member Sa, Sb in the manner shown in Figure 9. Pressure is thus applied both to the outside of the exterior the pipe part 9a, 9b and the inside of the inner pipe part Sa, Sb. In this case, outer 9a, 9b and inner are pressed pipe parts Sa, Sb with high pressure against each other during the time that the glue hardens. At the same time heat is applied in a known manner to accelerate the curing. After curing, a finished tube can be section 1a is removed from the press dies 10, 10b. The pipe section 1a is thus built up of an inner pipe part Sa, Sb and an outer pipe part 9a, 9b which are both pipes of laminated wood and 10 15 20 25 30 glued together and rotated relative to each other to separate longitudinally planes of glue joints apart. The wall thickness for a finished post l, when this is assembled pipe sections 1a and splice pipes 2 are defined here as W = d for the pipe section 1a plus d for the joint pipe 2.

The complete pipe section 1a can be made with stronger joints by the halves 8a, 8b, 9a, 9b are milled and shaped with finger mills along the longitudinal edges and at its ends. When joining the cylinder halves, these are then glued together with so-called finger joints along their entire length where the edges of the cylinder halves meet. Also the joint pipes 2 provided with corresponding finger joints along the longitudinal edges that meet (Figs. 6 and 10).

[0020] the ends of the pipe sections 1a, the pipe sections 1a when these being joined to a post 1 can When a complete pipe section 1a has been completed, finger milling cutters can also be prepared at glued together by means of finger jointing end to end to a stronger joint than if completely flat edges are used on the ends. In Fig. 6 it is schematically shown at the circles 6b that the ends of pipe sections 1a are provided with finger mills for preparing end splicing between pipe sections 1a. Milling of the ends is preferably performed when the pipe section 1a is glued and complete.

The splice pipes 2 are manufactured in the same way as the pipe sections 1a. That part of a pipe section 1a surrounding a splice tube inserted inside the pipe section 1a can be screwed against the splice tube 2 to give increased stability to the current joint. The semi-cylindrical shells of the inner and outer parts of the joint pipes 2 can be glued to each other along the edges where these shells meet, or with advantage to be finger-jointed along its length in the same way as described for the pipe sections la.

A post according to the invention is composed of e.g. 3, 4 or 5 pipe sections 1a as put together longitudinally. In a first pipe section 1a a splice pipe 2 is inserted, preferably up to half the length of the pipe section 1a, and glued together as described. A second pipe section 1a the first end is threaded on the outside of the approximately half length of the splice tube 2 projecting from it first pipe section 1a (Fig. 3). An additional splice pipe 2 is inserted into the second of the second pipe section end, after which a third pipe section 1a is laid on this further splice pipe and joined gas on described manner. The desired number of pipe sections 1a are joined to a final post 1 as described way (Fig. 1, Fig. 10). If desired, each end of the final post 1 is advantageously filled 10 l5 20 25 30 with a half splice tube 2 to also give the ends of the post 1 the same structure as the central ones the parts of the post.

A further variant of a post according to the invention aspect is described in the following.

This refers to a post that is made to withstand greater stresses in the form of breaking forces from snow, ice, wind, etc. Such more powerful designs may be required if the post 1 is used, for example as a mast for mobile telephony.

According to this alternative embodiment, quartz cylindrical shells are used instead as joined to external and internal benefits. Thus, a press die 3 is used to form shells which need only cover a quarter of the periphery of a circle. In this way a lot can thicker laminated wood shells are provided. In this example, outer pipe sections are made with for example with a thickness of 20 mm and inner pipe parts with, for example, with a thickness of 20 mm, thus a pipe section 1a obtains the wall thickness d = 40 mm. Correspondingly the joint pipe 2 is manufactured and the wall thickness d = 40mm is given. For the complete post l, when it assembled with fl your modules of pipe sections 1a and inside these modules of splice pipes 2 thus a wall thickness W arises at the post which amounts to 80 mm in this alternative more powerful execution. Furthermore, pipe sections 1a can be made longer than 2 m if this is considered advantageous. The diameters of inner pipe sections and outer pipe sections in a pipe section are adjusted so that the outer diameter of the pipe section 1a will be 440 mm according to the example.

In the production of a pipe section 1a according to the alternative embodiment, the process becomes to glue together quartz sections of outer pipe fittings with inner pipe fittings slightly different than in the example above (as shown in Fig. 6). In this example, all the quartz cylindrical shells are carried for inner and outer tube parts together in the press according to Fig. 6 and joined to a cylindrical shell forming a pipe section 1a or a splice pipe 2. It is shown in Fig. 7 that longitudinally joints of outer and inner fittings, when rotated 90 degrees relative to each other, do not males in line with each other, but are rotated about 45 degrees in relation to each other.

Finger joints are made at longitudinal contact surfaces between the quarter sections that are spliced together into cylindrical pipe sections 1a resp. splice tubes. Also in this embodiment joints the joint pipes 2 are thus joined together in a corresponding manner as resp. pipe section 1a at completion of such a splice tube 2. However, it may be appropriate to place the ends between splice tubes 2 where these do not meet each other spliced by means of finger joints. 10 15 20

Fig. 10 shows a complete post 1, where the pipe sections 1a of the post are joined together by means of finger joints 12 at the ends of the pipe sections 1a, where these meet each other. In order to clarify the composition of a post 1, the splice tubes 2 are shown, which as described are glued to the inner surface of the pipe sections 1a, as a longitudinal post part made with dashed lines next to the spliced pipe sections 1a. It is also with arrows shown that these joint pipes are located inside the pipe sections 1a.

In the two examples above, the alternative posts have an outer diameter of 25 - 30 cm resp. 44 cm. These two outer diameters are examples only. Wall thickness W of a completed post is 25 mm resp. 80 mm. These values are also examples. It is doubtful if one sufficient strength is achieved with a post, where the wall thickness W is less than 20 mm. For shorter posts, however, W = 15 mm could be used. Thicker walls than e.g. W = 110 mm torde can be excluded, as a post 1 with such thick walls becomes both heavy and expensive. Thus can a suitable wall thickness W be between 15 and 110 mm. Preferably, the wall thickness W be 20 mm <W <90 mm.

Definition: by the term cylindrical is meant any type of cylinder, ie. that one cylindrical body may have a cross section with any closed curve. The curve can, for example, be elliptical.

Claims (10)

10 l5 20 25 30 PATENT REQUIREMENTS Post comprising at least two pipe sections (1a) designed as cylindrical hollow tubes of laminated wood, characterized in that: said pipe sections (1a) have an inner cylindrical cavity with inner diameter D and are glued to their longitudinal ends, where they abut each other. and - that a splice tube (2), also designed as a cylindrical hollow tube of laminated wood with an outer diameter D, is approximately half inserted into the inner cylindrical cavity in each end of the two pipe sections glued together (1a). ). A post according to claim 1, wherein each pipe section (1a) comprises an inner pipe part (Sa, Sb) of laminated wood and an outer pipe part (9a, 9b) of laminated wood, these two pipe parts being glued to each other, the inner pipe part ( Sa, Sb) are rotated relative to the outer tube portion (9a, 9b) along their common longitudinal axis. A post according to claim 1, wherein the outer surface of the splice tube (2) is glued to the inner surfaces of at least one of the two pipe sections (1a) glued to each other which abut against the splice tube (2). Post according to any one of the preceding claims, wherein the total wall thickness of the post (1) is in the range 15 mm <W <110 mm and preferably in the range 20 mm <W <90 mm. Post according to any one of claims 1 to 4, wherein the fiber direction of at least some layers of veneers in a pipe section (1a) is crossed. Post according to any one of claims 2 - 5, wherein inner and outer pipe parts comprise finger-jointed parts. Method for manufacturing the post according to claim 1, wherein the method comprises the steps: - a predetermined number of pipe sections (1a) of laminated wood are glued to each other at the longitudinal ends of the pipe sections abutting each other, - a splice pipe (2) is inserted into the ends of the pipe sections (la) to be joined together. 10 15 20 25 A method according to claim 7 comprising the steps - inner cylindrical tube halves (Sa, 8b) resp. quartz-cylindrical shells for said inner pipe part are made of laminated wood, - outer cylindrical pipe halves (9a, 9b) resp. quartz-cylindrical shells for said outer tube part are made of laminated wood, - said inner tube halves (Sa, 8b) and said outer tube halves (9a, 9b), alternatively inner quartz-cylindrical shells and outer quartz-cylindrical shells are joined by gluing and pressing in a mold 10, inner tube halves resp. the inner quartz-cylindrical shells form an inner tube part which is concentrically glued to the outer tube halves resp. the outer quartz-cylindrical shells forming an outer pipe part, the inner pipe part and the outer pipe part together forming a pipe section (1a), - said cylindrical joint pipe (2) being made of laminated wood. Method according to claim 7 or 8, comprising the step: - the splice tube (2) is glued to at least one of the tube sections (1a) surrounding the splice tube (2). Method according to one of Claims 7 to 9, comprising at least one of the steps: - surfaces of at least one of the pipe sections (1a) which abut the joint pipe (2) at a joint are screwed against the joint pipe (2). longitudinal surfaces of pipe sections which build up pipe sections (1a) are finger-jointed towards each other where said pipe sections contact each other. - the ends of pipe sections (1a) which contact each other when joining to a post (1) are finger-jointed against each other.