WO2018074962A1

WO2018074962A1 - Framing section and method of assembling the same

Info

Publication number: WO2018074962A1
Application number: PCT/SE2017/050973
Authority: WO
Inventors: Peter Lindberg
Original assignee: Oneday Wall Ab
Priority date: 2016-10-19
Filing date: 2017-10-04
Publication date: 2018-04-26
Also published as: SE1651377A1; EP3529425A1; EP3529425A4; SE540264C2

Abstract

A framing section (100) for integration into a wall includes first and second wall members (110, 120) arranged opposite to one another and with respective main surfaces oriented in parallel. A block unit (150), arranged between the first and second wall members (110, 120),has partitions (150A, 150B) arranged with respective main surfaces oriented perpendicularly to the first and second wall members (110, 120) and connected thereto via tongues (151A, 152A; 151B, 152B) inserted into grooves (110A, 110B; 120A, 120B) of the first and second wall members (110, 20). The first and second wall members (110; 120) are secured to the block unit (150) via locking members (151R, 152R; 351, 352) engaging into the grooves (110A, 110B; 120A, 120B) of the first and second wall members (110; 120) respectively.

Description

Fram ing Section and Method of Assem bl ing the same

THE BACKGROUN D OF THE I NVENTION AND PRIOR ART

The present invention relates generally to solutions for mounting door portals and similar build ing structures in an efficient man- ner. More particu larly the invention relates to a framing section according to the preamble of claim 1 and a corresponding method of assembly.

In modern bu ildings so-called framing sections are often integrated around doors and other openings in order to provide attach- ments for doorframes, window frames and to enable ventilation .

Traditionally, the framing sections are assembled on site, i.e. at the location where a building , or a part thereof, is bu ilt. This may involve cutting various construction elements to the desired shapes and dimensions. Thereafter, the elements are connected to one another via fasteners, such as screws, nails and/or glue. This process is time consuming and requires different consumables.

PROBLEMS ASSOCIATED WITH THE PRIOR ART

Moreover, the traditional approach can lead to imperfections. For example, the actual measures of the completed framing section may deviate from the desired measures. This is especially the case if accumu lative effects apply, i.e. if two or more framing sections are included in one and the same construction . The fasteners, as such , for example glue, may cause problems in terms of uncertain measures because it is difficult to apply an exact and equal amount in all joints. This will lead to variations in the overall measures of the completed framing sections.

SUMMARY OF THE I NVENTION

The object of the present invention is therefore to offer an improved solution , which avoids, or at least mitigates, the above problems.

According to one aspect of the invention , the object is achieved by the initially described framing section, wherein an inner sur- face of each of the first and second wall members contains first and second grooves extending along the respective wall member. Each partition of the block unit includes first and third edge sides having a respective tongue extending along the first and third edge sides respectively. The first groove in the inner surface of the first wall member is configured to receive the tongue of the first edge side of the first partition . The second groove in the inner surface of the first wall member is configured to receive the tongue of the first edge side of the second partition . The first groove in the inner surface of the second wall member is configured to receive the tongue of the third edge side of the first partition . The second groove in the inner surface of the second wall member is configured to receive the tongue of the third edge side of the second partition . Thus, the block unit is fixated to the first and second wall members. Further, the first and second wall members are secured to the block unit via locking members engaging into at least one of the first and second grooves of the first and second wall members respectively.

The proposed framing section is advantageous because it does not require any external fasteners, for instance in the form of screws, nails, glue or the like. Moreover, the components of the proposed design, i.e. the wall members and the block, can be prefabricated such that the on ly adaptation on site involves length adjustment. This, in turn, ensures a very high lateral pre- cision . For example when bu ilding a corridor with a large number of adjoining rooms, also the last door in the row can be mounted with minimum deviation from its intended position .

According to one embodiment of this aspect of the invention , each of the tongues of the partitions has a wedge-shaped cross section profile with a distal end thereof having a wider cross section measure than a proximal end thereof. Correspondingly, each of the grooves in the wall members has an inclined wall adapted to the wedge-shaped cross section profiles of the tongues. Thereby, the wall members lock into the block unit in rigid joinery type-of-joints.

According to another embodiment of th is aspect of the invention , the block unit contains a center part, which is arranged between and is connected to the first and second partitions. The center part, in turn , preferably includes a wall segment arranged with its main sides oriented perpendicu larly to the first and second partitions and oriented perpendicularly the first and second wall members. Thus, the design becomes robust and straightforward to integrate into a building . According to yet another embodiment of th is aspect of the invention , the locking members are included in each of at least two of said tongues in the form of a respective resilient member that is adapted to expand into a respective one of said grooves. The at least two tongues adjoin a common one of the first or second partitions. Thereby, the tongues are locked against the angled wall when the resilient members expand into the grooves. This accomplishes a both secure and detachable interconnection .

According to a further embodiment of this aspect of the invention , a first one of the first and second wall members contains a through hole configured to receive an actuator rod . The throug h hole is arranged with an inner open ing thereof adjoin ing one of the resilient members in one of the grooves in such a manner that pushing the actuator rod through the through hole against the resilient member causes the first wall member to be released from the partition to which it is attached . Hence, the framing section can effortlessly be opened after assembly, for example to install conduits for electricity, water, sewer and/or gas.

Moreover, according to another embod iment of the invention , the center part has a through opening configured to allow throughput of conduits for at least one of optic signals, electric signals, electricity, water, sewage and gas inside the wall section . Thereby, the framing section may house various types of installations. According to an additional embodiment of this aspect of the invention , the locking members are represented by a pair of wedges. Further, there is a respective spacing between the center part and each of the first and second wall members, and each of the spacings is configured to receive a respective wedge in the pair of wedges. Thereby, introducing the pair of wedges into the spacings causes forces to be exerted which forces lock the tongues against the inclined wall. Consequently, the wall members can be fastened securely to the lock unit. It is also straightforward to control the force by which the wall members are faste- ned , namely based on how hard the wedges are inserted into the spacings.

According to still another embodiment of this aspect of the invention , at least one of the grooves is configured to receive at least one of the wedges so as to further lock the at least one wedge in a direction perpendicular to the direction in which the grooves extend along the first and second wall members respectively. Preferably, to this aim, at least one of the first and second partitions includes a recess adjoin ing a respective one of the grooves. Each of these recesses is configured to receive a wedge, and the introduction of such wedges into the recesses causes forces to be exerted which forces lock the tongues against the angled wall.

According to another aspect of the invention , the object is achieved by a method of assembly arrang ing involving first and se- cond wall members opposite one another. The first and second wall members are oriented such that a main surface of the first wall member is parallel to a main surface of the second wall member. The method further involves arranging a block unit between the first and second wall members. The block unit has first and second partitions arranged with a respective main surface oriented perpendicularly to the first and second wall members. Each of the first and second partitions is connected to the first and second wall members; and each of the first and second partitions includes first, second , third and fourth edge sides that are pairwise opposite to one another. This means that the first edge side is opposite to the third edge side and the second edge side is opposite to the fourth edge side. An inner surface of each of the first and second wall members contains first and second grooves. Further, each of the first and third edge sides of the partitions has a tongue extending along the first and third edge sides respectively. Additionally, the method involves fixating the block unit to the first and second wall members by the following steps. The tongue of the first edge side of the first partition is in- serted into the first groove of the inner surface of the first wall member, the tongue of the first edge side of the second partition is inserted into the second groove of the inner surface of the first wall member, the tongue of the third edge side of the first partition is inserted into the first groove of the inner surface of the second wall member, and the tongue of the third edge side of the second partition is inserted into the second groove of the inner surface of the second wall member. Thereby, the first and second wall members are secured to the block unit via locking members engaging into the first and/or second grooves of the first and second wall members respectively. The advantages of this method , as well as the preferred embodiments thereof, are apparent from the discussion above with reference to the proposed system.

Further advantages, beneficial features and applications of the present invention will be apparent from the following description and the dependent claims.

BRI EF DESCRI PTI ON OF TH E DRAWI NGS

The invention is now to be explained more closely by means of preferred embodiments, which are disclosed as examples, and with reference to the attached drawings.

Figure 1 illustrates the design of a framing section according to a first embodiment of the invention;

Figure 2 exemplifies a block unit according to the first embodiment of the invention ;

Figures 3a-b illustrate the design of a framing section according to a second embodiment of the invention;

Figures 4a-b illustrate the design of a framing section according to a th ird embodiment of the invention; and

Figure 5 illustrates, by means of a flow diagram, the general assembly method according to the invention.

DESCRI PTI ON OF PREFERRED EM BODI MENTS OF TH E I NVENTION

Figure 1 shows a design of a framing section 100 according to a first embodiment of the invention.

The framing section 100 is intended for integration into a wall, for example to form part of a so-called portal around a door in an inner wall of a building . The framing section 100 includes first and second wall members 1 10 and 120 respectively and a block unit 150.

The first and second wall members 1 10 and 120 are arranged opposite to one another and are oriented such that a main surface of the first wall member 1 10 is parallel to a main surface of the second wall member 120. An inner surface of each of the first and second wall members 1 10 and 120 contains first and second grooves 1 1 OA and 1 10B respective 120A and 120B, which all are parallel to one another and extend along the respective wall member 1 10 and 120.

The block un it 1 50 is arranged between the first and second wall members 1 10 and 120, i.e. adjoining the inner surfaces of the first and second wall members 1 10 and 120. The block unit 150, in turn, has first and second partitions 150A and 150B respectively, which are arranged with a respective main surface oriented perpendicularly to the first and second wall members 1 10 and 120. Each of the first and second partitions 150A and 150B is connected to the first and second wall members 1 10 and 120.

According to one preferred embodiment of the invention , to allow convenient integration of the framing section 100 into standardized walls and other types of build ing structures, the center part 155 includes a wall segment arranged with its main sides ori- ented perpendicu larly to the first and second partitions 150A and 150B. Further preferably, the wall segment of the center part 155 is also arranged perpendicular to the first and second wall members 1 10 and 120.

The first and second partitions 150A and 150B are preferably made up by a respective rectangular-shaped piece of wood . In any case, each of the first and second partitions 150A and 150B has first, second , third and fourth edge sides being pairwise opposite to one another. This means that the first edge side is opposite to the third edge side and the second edge side is oppo- site to the fourth edge side. Moreover, each of the first and th ird edge sides has a tongue 151 A and 152A respective 151 B and 152B, which extend along the first and th ird edge sides respectively.

The first groove 1 1 OA in the inner surface of the first wall mem- ber 1 10 is configured to receive the tongue 151 A of the first edge side of the first partition 150A. The second groove 1 10B in the inner surface of the first wall member 1 10 is configured to receive the tongue 151 B of the first edge side of the second partition 150B. The first groove 120A in the inner surface of the se- cond wall member 120 is configured to receive the tongue 152A of the third edge side of the first partition 150A. The second groove 120B in the inner surface of the second wall member 1 20 is configured to receive the tongue 152B of the third edge side of the second partition 150B. Thus, when all four tongues 151 A, 151 B, 152A and 152B are located in the grooves 1 1 OA, 1 1 OB, 120A and 120B respectively, the block unit 150 is fixated to the first and second wall members 1 10 and 1 20. Further, the first and second wall members 1 10 and 120 are secured to the block unit 150 via locking members engaging into either the first groove 1 1 OA and 120A respectively of the first and second wall members 1 10 and 120, the second groove 1 10B and 120B respectively of the first and second wall members 1 10 and 120, or both (i.e. all the grooves 1 10A, 1 10B, 120A and 120B). As will be discussed below, the locking members may be implemented in various ways, for instance via resilient members 151 R and 152R, as shown in Figures 1 and 2, which are adapted to expand into a respective one of the grooves, e.g . 1 1 OA and 120A. Preferably, each of the tongues 151 A, 1 52A, 151 B and 152B has a wedge shaped cross section profile with a distal end thereof having a wider cross section measure than a proximal end thereof, and each of said grooves 1 1 OA, 1 10B, 120A and 120B has an inclined wall adapted to the wedge-shaped cross section profile, for instance as exemplified in Figure 1 . I n other words, the grooves 1 1 OA, 1 10B, 120A and 120B each has at least one ang led wall defining a respective acute angle (i.e. < 90°) towards the inner surface of the wall member 1 10 and 1 20 respectively.

In the embodiment shown in Figure 1 , a pair of resilient mem- bers 1 51 R and 152R is included in the block un it 1 50. More precisely, here, a first tongue 151 A of the first partition 150A includes a first resilient member 1 51 R; and a second tongue 152A of the first partition 150A includes a second resilient member 152R. The first resilient member 151 R is configured to expand into the first groove 1 1 OA of the first wall member 1 1 0 and the second resilient member 152R is configured to expand into the first groove 120A of the second wall member 120. As a result, when the first tongue 151 A is inserted into the groove 1 10A, the first tongue 1 51 A is locked against the angled wall of this groove 1 10A. Correspondingly, when the second tongue 152A is inserted into the groove 120, the second tongue 152A is locked against the angled wall of this groove 120A. Moreover, due the wedge-shaped profiles of the tongues 151 B and 152B the ang- led walls of the second grooves 1 1 0B and 1 20B adapted thereto and the ridged relationsh ip between the first and second partitions 150A and 150B, also the second partition 1 50B is locked to the wall members 1 10 and 120 when the resilient members 151 R and 152R expand into the grooves 1 10A and 120A. Figure 2 exemplifies how the block unit 150 according to the first embodiment of the invention may be designed . Here, the resilient members 151 R and 152R, as such , are inflexible. I nstead , the members 151 R and 152R are connected to a resilient component 250, e.g . a rubber cylinder, and the members 151 R and 152R are movable in a respective recess in a center part 155 of the block unit 150. The center part 155 arranged between and connected to the first and second partitions 150A and 150B. Thus, provided that the protruding parts of the resilient members 151 R and 152R are inflexible, the two tongues 151 A and 152A including the resilient members 151 R and 152R preferably adjoin a common one of the first or second partitions 150A and 150B. Namely, in such a case the resilient members 151 R and 152R can be caused to expand via a common resilient component as exemplified by 250 in Figure 2. I n other designs, however, the resilient members 151 R and 152R may equally well be co-located with different ones of the first or second partitions 150A and 150B.

Returning now to Figure 1 , we see a through hole 125H between an outer surface of the second wall member 120 and its first groove 120A. The through hole 125H is configured to receive an actuator rod 125, and the through hole 125H is arranged with an inner open ing thereof adjoin ing any resilient member 152R located in the first groove 1 10A. Thus, if the actuator rod 1 25 is pushed through the through hole 125H , the resilient member 152R can be depressed into the center part 155 such that the first wall member 1 10 is released from the first partition 150A. Furthermore, provided that there is sufficient play between the tongue 152B and the groove 120B, said release from the first partition 150A also enables the first wall member 1 10 to be released from the second partition 150B. Consequently, by using the actuator rod 125 and the through hole 125H , an operator may reopen the assembled framing section 100 and for example install electricity cables and/or water pipes therein.

Figures 3a and 3b illustrate the design of a framing section 100 according to a second embodiment of the invention. Here, the locking members are represented by a pair of wedges 351 and 352. There is further a respective spacing between the center part 155 and each of the first and second wall members 1 1 0 and 120. Each of the spacings is configured to receive a respective one of the wedges 351 and 352. Preferably, however not necessarily, one of the grooves (here exemplified by 1 1 OA) in each of the first and second wall members 1 10 and 120 (not shown for presentation purposes) is configured to receive the wedge 351 so as to lock the wedge 351 in a direction perpendicular to the direction in which the grooves 1 1 OA and 120A (not shown for presentation purposes) extend along the first and second wall members 1 10 and 120 respectively.

In any case, the introduction of the wedges 351 and 352 into the spacings between the center part 155 and the wall members 1 10 and 120 causes forces to be exerted which forces lock the tongues 151 A, 152A, 151 B and 152B (not shown) against the inclined wall analogous to what has been explained above.

In addition , Figures 3a and 3b illustrate a further embodiment of the invention , where the center part 155 includes a through ope- ning configured to allow throughput of various kinds of conduits, cables etc. Consequently, the framing section 100 may be used for holding installations of communication lines, electricity, water and/or gas inside a wall section . Figures 4a and 4b illustrate the design of a framing section 100 according to a third embodiment of the invention.

This is a variant of the invention , where the wedges 351 and 352 are inserted into the grooves 1 1 OA and 120A so as to further lock the wedges 351 and 352 in a direction perpendicular to the direction in which the grooves 1 1 OA and 120A extend along the first and second wall members 1 10 and 120 respectively. Here, however, no spacings between the center part 155 and the wall members 1 10 and 120 are necessary. Instead , at least one of the first and second partitions (here 150A) has a respective recess 451 and 452 adjoin ing one of the first or second grooves (here 1 1 OA and 120A). The recesses 451 and 452 are configured to receive a respective one of the wedges 351 and 352. Analogous to the above, introducing the wedges 351 , 352 into said re- cesses 451 and 452 causes forces to be exerted , which forces lock the tongues 151 A, 152A, 151 B and 152B against the angled walls of the grooves 1 10A, 120A, 1 10B and 120B.

In order to sum up, and with reference to the flow diagram in Figure 5, we will now describe the general method according to the invention for assembling a framing section 100.

In a first step 510, a first wall member is arranged such that an inner surface thereof containing first and second grooves is accessible. The first and second grooves are parallel to one another and extend along the first wall member. In a subsequent step 520, a block unit is positioned onto the first wall member (or vice versa). The block unit has first and second partitions that are arranged with a respective main surface oriented perpendicularly to the first wall member. Each of the first and second partitions has a pair of tongues extending along oppo- sing edge sides of the partition . All four tongues of the block unit extend straight along the edge sides in a common direction . The block un it is positioned relative to the first wall member such that first and second ones of the tongues are inserted into the first and second grooves respectively of the first wall member.

Then , in a step 530, a second wall member is positioned onto the block unit (or vice versa). Analogous to the first wall member, the second wall member has an inner surface containing first and second grooves that are parallel to one another and extend along the second wall member. The second wall member is positioned relative to the block unit such that third and fourth ones of the block unit's tongues are inserted into the first and second grooves respectively of the second wall member. In a step 540, the first and second wall members are secured to the block unit via locking members engag ing into at least one of the first and second grooves of the first and second wall members respectively. Clearly, therefore a first part of step 540 may be executed in conjunction with step 520 when the block unit is positioned onto the first wall member; whereas a second part of step may be executed in conjunction with step 530 when the second wall member is positioned onto the block unit.

The term "comprises/comprising" when used in this specification is taken to specify the presence of stated features, integers, steps or components. However, the term does not preclude the presence or addition of one or more add itional features, integers, steps or components or groups thereof.

The invention is not restricted to the described embodiments in the figures, but may be varied freely within the scope of the claims.

Claims

1 . A framing section (100) for integration into a wall, the framing section comprising :

first and second wall members (1 10, 120) arranged oppo- site to one another and oriented such that a main surface of the first wall member (1 10) is parallel to a main surface of the second wall member (120), and

a block unit (150) arranged between the first and second wall members (1 10, 120), the block unit (150) having first and second partitions (150A, 150B) arranged with a respective main surface oriented perpendicularly to the first and second wall members (1 10, 120), each of the first and second partitions (150A, 150B) being connected to the first and second wall members (1 10, 120), and each of the first and second partitions (150A, 150B) comprises first, second , third and fourth edge sides being pairwise opposite to one another, where the first edge side is opposite to the third edge side and the second edge side is opposite to the fourth edge side, characterized in that: an inner surface of each of the first and second wall members (1 10, 120) comprises first and second grooves (1 1 OA, 1 10B; 120A, 120B) extending along the respective wall member (1 10, 120); each of the first and th ird edge sides comprises a tongue ( 151 A, 152A; 151 B, 152B) extend ing along the first and third edge sides respectively; the first groove (1 1 OA) in the inner surface of the first wall member (1 10) is configured to receive the tongue (151 A) of the first edge side of the first partition (150A); the second groove (1 10B) in the inner surface of the first wall member (1 10) is configured to receive the tongue (151 B) of the first edge side of the second partition (150B); the first groove (1 20A) in the inner surface of the second wall member (120) is configured to receive the tongue (152A) of the third edge side of the first partition (150A); the second groove (120B) in the inner surface of the second wall member (120) is configured to receive the tongue (152B) of the third edge side of the second partition (150B) so as to fixate the block unit (150) to the first and second wall members (1 10; 120); and the first and second wall members (1 10; 120) being secured to the block unit (150) via locking members (151 R, 152R; 351 , 352) engaging into at least one of the first and second grooves (1 1 OA, 1 1 OB; 120A, 120B) of the first and second wall members (1 10; 120) respectively,

wherein each of said tongues (151 A, 152A; 151 B, 152B) has a wedge-shaped cross section profile with a distal end thereof having a wider cross section measure than a proximal end thereof, and each of said grooves (1 10A, 1 10B; 120A, 120B) has an inclined wall adapted to the wedge-shaped cross section profile, and

wherein the block unit (150) comprises a center part (155) arranged between and connected to the first and second partitions (150A, 150B).

2. The framing section accord ing to claim 1 , wherein the cen- ter part (155) comprises a wall segment arranged with its main sides oriented perpendicularly to the first and second partitions (150A, 150B) and perpendicu larly the first and second wall members (1 10, 120).

3. The framing section according to any one of claims 1 or 2, wherein the locking members are comprised in each of at least two of said tongues (151 A, 152A) in the form of a respective resilient member (151 R, 152R) adapted to expand into a respective one of said grooves (1 1 OA, 120A) thereby locking said at least two of said tongues (151 A, 152A) against the inclined wall.

4. The framing section accord ing to any one of the preceding claims, wherein one (1 10) of the first and second wall members (1 10, 120) comprises a through hole (125H) configured to receive an actuator rod (125), and the through hole (125H) being arranged with an inner opening thereof adjoining one of the resi- lient members (152R) in one of the grooves (1 10A), such that pushing the actuator rod (125) through the through hole (125H) against said one of the resilient members (152R) causes the first wall member (1 10) to be released from a partition (150A) of the first and second partitions (150A, 150B) in which partition (150A) said one of the resilient members (152R) is included .

5. The framing section accord ing to any one of the preceding claims, wherein the locking members are represented by a pair of wedges (351 , 352), there is a respective spacing between the center part (155) and each of the first and second wall members (1 10, 120), each of said spacings is configured to receive a respective one of said pair of wedges (351 , 352), and the introduction of said pair of wedges (351 , 352) into said spacings causes forces to be exerted which forces lock said tongues (1 51 A, 152A; 151 B, 152B) against the inclined wall.

6. The framing section according to claim 5, wherein at least one of said grooves (1 1 OA, 120A) is configured to receive at least one wedge of said pair of wedges (351 , 352) so as to fur- ther lock the at least one of said wedges (351 , 352) in a direction being perpendicular to the direction in which said grooves (1 10A, 120A) extend along the first and second wall members (1 10, 120) respectively.

7. The framing section according to any one of claims 1 or 2, wherein at least one of the first and second partitions (150A) comprises a recess (451 , 452) adjoin ing a respective one of said grooves (1 1 OA; 120A), each of said recesses (451 , 452) being configured to receive a wedge (351 , 352) , and the introduction of the wedges (351 , 352) into said recesses (451 , 452) causing forces to be exerted which forces lock said tongues (1 51 A, 152A; 151 B, 152B) against the angled wall.

8. The framing section accord ing to any one of the preceding claims, wherein the center part (155) comprises a through opening configured to allow throughput of conduits for at least one of electricity, water and gas inside the wall section .

9. A method of assembling a framing section (100), the me- thod comprising :

arranging first and second wall members (1 10, 120) opposite one another, the first and second wall members (1 10, 120) being oriented such that a main surface of the first wall member (1 10) is parallel to a main surface of the second wall member (120), and

arranging a block unit (150) between the first and second wall members (1 10, 120), the block unit (150) having first and second partitions (150A, 150B) arranged with a respective main surface oriented perpendicularly to the first and second wall members (1 10, 120), each of the first and second partitions (150A, 150B) being connected to the first and second wall members (1 10, 120), and each of the first and second partitions (150A, 150B) comprising first, second , third and fourth edge si- des being pairwise opposite to one another, where the first edge side is opposite to the third edge side and the second edge side is opposite to the fourth edge side,

characterized by:

an inner surface of each of the first and second wall members (1 10, 120) comprising first and second grooves (1 10A, 1 10B; 120A, 120B) and each of the first and third edge sides comprising a tongue (151 A, 152A; 151 B, 152B) extending along the first and third edge sides respectively, wherein each of said tongues (151 A, 152A; 151 B, 152B) has a wedge-shaped cross sec- tion profile with a distal end thereof having a wider cross section measure than a proximal end thereof, and each of said grooves (1 10A, 1 10B; 120A, 120B) has an inclined wall adapted to the wedge-shaped cross section profile, and wherein the block unit (150) comprises a center part (155) arranged between and con- nected to the first and second partitions (150A, 150B); and the method comprising fixating the block unit (150) to the first and second wall members (1 10; 120) by:

inserting the tongue ( 151 A) of the first edge side of the first partition (150A) into the first groove (1 1 OA) of the inner surface of the first wall member (1 10);

inserting the tongue (151 B) of the first edge side of the se- cond partition (150B) into the second groove (1 1 OB) of the inner surface of the first wall member (1 10);

inserting the tongue (152A) of the third edge side of the first partition ( 150A) into the first groove ( 120A) of the inner sur- face of the second wall member (120);

inserting the tongue (152B) of the third edge side of the second partition (150B) into the second groove (120B) of the inner surface of the second wall member (120); and

securing the first and second wall members (1 10; 120) to the block un it (1 50) via locking members (151 R, 1 52R; 351 , 352) engaging into at least one of the first and second grooves (1 10A, 1 10B; 120A, 120B) of the first and second wall members (1 10; 120) respectively.