JP7222746B2 - Partition unit and partition structure using this partition unit - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dry partition unit for partitioning the interior space of a building and a partition structure using the partition unit, and more particularly to a partition unit and partition structure excellent in workability, sound insulation and fire resistance. .

Conventionally, many wet-type structures such as RC and SRC structures have been built, but such structures using concrete are excellent in sound insulation and fire resistance. . For this reason, for the purpose of shortening the construction period and reducing costs, dry partition panels are often used for partitioning adjacent living spaces in housing complexes, hotels, and the like.

The following are known as dry partition structures. A structure is known in which metal studs (studs) are attached to upper and lower runners attached to upper and lower slab surfaces (ceiling surface and floor surface), and partition panels are attached to both surfaces of the studs. As such a structure, Patent Document 1 describes a structure in which studs are alternately arranged on wide runners laid on a ceiling surface and a floor surface, and a partition panel is attached thereon.

Patent Document 2 describes a partition panel in which a hollow reinforcing portion is integrally formed on a flat plate. In the structure of Patent Document 3, a reinforcing member is fixed in advance to the rear surface of the partition panel, and the reinforcing member is fixed to the upper and lower slabs with the reinforcing member facing inward.

Patent Document 4 describes a structure in which a reinforcing rib member is fixed to the rear surface of a partition panel. In the structure of Patent Document 5, reinforcing rib members are fixed to both ends of the back surface of the partition panel, and locking portions are attached via the reinforcing rib members, and the corner portions of the four partition panels with their back surfaces facing each other are attached to each other. are connected.

Japanese Utility Model Laid-Open No. 60-162607 Japanese Utility Model Laid-Open No. 54-049112 JP-A-60-005941 JP-A-07-207784 JP-A-01-098809

In the structure of Patent Literature 1, it takes a lot of time and effort to attach the metal studs, and the workability is low. For example, the structure of Patent Document 2 can be cited as one that does not have a step of attaching studs, but since a partition panel in which a flat plate and a hollow reinforcing portion are integrally formed is used, the flat plate is the same as the reinforcing portion that requires strength. It becomes a material, and the cost increases.

In the structures of Patent Documents 3 and 4, the materials of the partition panel and the reinforcing material are different, and the difference in the expansion and contraction rates of these materials may cause the partition panel to warp. Therefore, there is a problem that a step is generated in the joint or the joint is opened. In order to prevent this phenomenon, there is a method of aligning the surfaces by driving a screw so as to straddle the joint, but this reduces workability.

In the structure of Patent Document 5, in which the corners of four partition panels with their backs facing each other are connected to each other, the partition panels are fixed relatively firmly, so that the joints are less likely to have steps or openings. However, it requires a large number of dedicated metal fittings and increases the amount of work at the construction site, resulting in high costs and low workability.

SUMMARY OF THE INVENTION In view of the problems of the prior art, it is an object of the present invention to provide a partition unit capable of obtaining good workability, reducing costs, and suppressing warping of a partition panel, and a partition structure using this partition unit. and

The partition unit of the present invention includes a partition panel member that partitions an interior space of a building, and a partition panel member that is fixed along the back surface of the partition panel member with a gap from the partition panel member, and that is long in one direction to reinforce the partition panel member. a rib member, and a plurality of elastic members which are formed in the shape of a small sheet having a size corresponding to the width of the rib member and are sandwiched between the partition panel member and the rib member in a state in which they are not elastically deformed. , wherein the plurality of elastic members are provided at intervals along the longitudinal direction of the rib member, and the force applied between the two members is relieved by the plurality of elastic members.

The partition unit of the present invention comprises a partition panel member, a rib member for reinforcing the partition panel member, and an elastic member sandwiched between the partition panel member and the rib member. Since it is not necessary to install a metal stud in advance, it is easy to install and has high workability. The partition panel member and the rib member can be made of different materials that take advantage of their respective material properties (strength required for the partition panel member and strength required for the rib member), which does not lead to an increase in cost. Since the elastic member fixed between the partition panel member and the rib member is sandwiched in a non-elastically deformed state, and the force applied between both members is relaxed, warping due to the difference in the expansion and contraction rates of both members can be prevented. can be suppressed. This eliminates the need for work to prevent the occurrence of a step at the joint and the phenomenon that the joint opens, thus improving workability. Furthermore, since it is sufficient to attach the partition unit having the partition panel member and the rib member for reinforcing the partition panel member to the partition portion, the amount of work at the construction site can be reduced and the cost can be reduced.

The partition structure of the present invention comprises: a plurality of partition units arranged horizontally in an interior space of a building; a lower runner fixed to the floor surface and supporting the lower part of the plurality of partition units; and an upper runner for supporting the upper part of the plurality of partition units, wherein each of the partition units includes a partition panel member that partitions an interior space of the building, and a partition panel member along the back surface of the partition panel member. A rib member that is fixed to the partition panel member at a distance and that is elongated in one direction to reinforce the partition panel member, and a small piece having a size corresponding to the width of the rib member between the partition panel member and the rib member. a plurality of elastic members formed in a sheet shape and sandwiched in a non-elastically deformed state , wherein the plurality of elastic members are provided at intervals along the longitudinal direction of the rib member; The force applied between the two members is relaxed by the plurality of elastic members.

A partition unit included in the partition structure of the present invention is composed of a partition panel member, a rib member that reinforces the partition panel member, and an elastic member sandwiched between the partition panel member and the rib member. Since it is not necessary to install a metal stud in advance, it is easy to install and has high workability. The partition panel member and the rib member can be made of different materials by taking advantage of their respective material properties, so that the cost does not increase. Since the elastic member fixed between the partition panel member and the rib member is sandwiched in a non-elastically deformed state, and the force applied between both members is relaxed, warping due to the difference in the expansion and contraction rates of both members can be prevented. can be suppressed. This eliminates the need for work to prevent the occurrence of a step at the joint and the phenomenon that the joint opens, thus improving workability. Furthermore, since it is sufficient to attach a partition unit having a partition panel member and a rib member for reinforcing the partition panel member to the partition portion, the amount of work at the construction site can be reduced and the cost can be reduced.

It is preferable to further include a correction plate attached so as to straddle the joint portion of the partition panel members of two adjacent partition units among the plurality of partition units to correct the step of the joint portion. In this case, it is possible to prevent the occurrence of a step at the joint without using a method for aligning the surfaces by driving a screw across the joint.

It is preferable that the upper end of the rib member of each partition unit and the ceiling surface are spaced apart from each other, and the lower end of the rib member and the floor surface are spaced apart. In this case, it is possible to further improve the effect of suppressing vibration and heat propagation in adjacent living spaces.

Preferably, the lower part of each partition unit is fixed to the lower runner, and the upper part of each partition unit is fitted into the upper runner. In this case, for example, the rib member can be easily attached by simply fitting it into the upper runner, and workability is greatly improved. This can reduce costs. Since the rib member is not completely fixed to the upper runner, the partition unit can easily follow the displacement when the interlayer is displaced, so that the seismic resistance can be improved.

As in the present invention, there is no need to install metal studs in advance, so workability is high. The partition panel member and the rib member can be made of different materials by taking advantage of their respective material characteristics, so that cost does not increase. Since the force applied between the partition panel member and the rib member is relaxed, warping due to the difference in the expansion and contraction rates of both members can be suppressed, and work to prevent warping is not required, resulting in high workability. Since it is only necessary to attach the partition unit having the partition panel member and the rib member for reinforcing the partition panel member to the partition portion, the amount of work at the construction site can be reduced and the cost can be reduced. Furthermore, it is possible to effectively suppress the propagation of vibrations and heat in adjacent living spaces, and to provide a structure with excellent earthquake resistance.

1 is a perspective view of a partition unit according to an embodiment of the present invention as viewed from the front side and the back side; FIG. It is a partial sectional view of a partition unit. It is a partial perspective view of the partition structure using a partition unit. FIG. 4 is a longitudinal sectional view of the partition structure shown in FIG. 3; 4 is a cross-sectional view of the partition structure shown in FIG. 3; FIG. It is a partial cross-sectional view of the partition structure to which the correction plate is attached, and a perspective view of the correction plate. It is a sectional view showing a modification of a rib member. It is explanatory drawing in the case of using a cross-sectional U-shaped or C-shaped rib member. It is a sectional view showing an upper anchor of this embodiment, its circumference, and its modification. (a) is a perspective view of a partition unit according to another embodiment as seen from the rear side, and (b) is a modified example of a correction plate.

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a partition unit 1 according to an embodiment of the present invention as seen from the front side and the back side, and FIG. 2 is a partial cross-sectional view of the partition unit 1. FIG. The partition unit 1 of this embodiment includes a partition panel member 2 that partitions the interior space of a building, a rib member 3 that reinforces the partition panel member 2, and an elastic member provided between the partition panel member 2 and the rib member 3. 4 and fixing means 5 for fixing them to each other.

The partition panel member 2 of the present embodiment is a plate material formed in a rectangular shape when viewed from the front, as shown in the drawing. Although the shape and dimensions of the partition panel member 2 are not limited, the shape and dimensions are set according to the size of the construction site. The material forming the partition panel member 2 is not limited as long as it is incombustible and can be used as a building partition. Fiberboards, particleboards, woody plywoods, hard fiberboards, steel plates, and the like.

When an inorganic material is selected for the partition panel member 2, a specific gravity of about 0.5 to 1.8 g/cm ³ is suitable. The maximum length ^of the partition panel member 2 is about 3000 mm when considering the floor height of a general collective housing. It is possible to prevent it from bending by using the one of Also, by using a material with a specific gravity of 1.8 g/cm ³ or less, it is possible to prevent the weight from becoming too large.

Furthermore, in the case of an inorganic material, cement, calcium carbonate, and pulp are used as main components in papermaking, and the specific gravity is 1.5 to 1.7 g/cm ³ , the bending strength is 17 to 23 N/cm ² , and the expansion ratio is 0.05 to 0.05. A 12% cementitious flexible board is preferred. By using this composition and physical properties, it is possible to obtain high effects in terms of sound insulation, fire resistance, and warpage suppression. Furthermore, when the gypsum board is attached with staples or screws using an air tacker or screwdriver, cracking of the partition panel member 2 and peeling of the back side can be prevented.

The rib member 3 is attached to the partition panel member 2 along the rear surface 2a of the partition panel member 2 with a space therebetween. One rib member 3 is attached to each of both ends of the partition panel member 2 along the longitudinal direction. The rib member 3 of this embodiment is made of a thin steel plate having a rectangular cross section. The rib member 3 is not limited to a steel material as long as it is incombustible, and any material may be used as long as it can exhibit the effect of reinforcing the partition panel member 2 and can stand on its own when used as a partition wall. The rib member 3 may be made of the same material as the partition panel member 2 .

The elastic member 4 sandwiched between the partition panel member 2 and the rib member 3 is in the form of a sheet cut to a required size. The dimensions and thickness of the elastic member 4 can be changed as appropriate. The elastic member 4 is sandwiched without being elastically deformed, so that the force applied between the partition panel member 2 and the rib member 3 can be relieved. As a result, the warpage due to the difference in expansion ratio between the partition panel member 2 and the rib member 3 can be reduced.

Since the force applied between the partition panel member 2 and the rib member 3 is relaxed, the difference in expansion ratio between the partition panel member 2 and the rib member 3 is allowed, and the warping of the partition panel member 2 can be suppressed. can. In addition, since the elastic member 4 is interposed between the partition panel member 2 and the rib member 3, not only the force relaxation effect but also the sound insulation effect can be significantly improved.

For this reason, it is important to attach the elastic member 4 so as not to compress it. The distance between the partition panel member 2 and the rib member 3 that prevents the elastic member 4 from being elastically deformed is the thickness of the elastic member 4 . Therefore, the partition panel member 2 and the rib member 3 are attached with a space corresponding to the thickness of the elastic member 4 therebetween. The fixing means 5 of this embodiment for attaching the rib member 3 to the partition panel member 2 while holding the elastic member 4 therebetween uses screws as shown in the figure.

The fixing means 5 may be in any form such as a pin, a rivet, or the like as long as the space between the partition panel member 2 and the rib member 3 can be maintained in addition to screwing. When attaching the rib member 3 to the partition panel member 2, a hard packing material such as slate or PVC having the same thickness as the elastic member is placed between the rib member 3 and the partition panel member 2 in advance so as not to compress the elastic member 4. It should be sandwiched between the two and removed after the installation is complete.

An adhesive may be used for the fixing means 5 . In this case, an adhesive is applied to the front and back surfaces of the elastic member 4, and the partition panel member 2 and the elastic member 4, and the elastic member 4 and the rib member 3 are brought into close contact with each other and fixed. If an adhesive is used, a force that presses the elastic member 4 does not act, so that the elastic member 4 can be securely attached without being compressed.

Examples of materials forming the elastic member 4 include natural rubber, synthetic rubber, styrene-butadiene rubber, butadiene rubber, chloroprene rubber, butyl rubber, nitrile rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, urethane rubber, and silicone rubber. , fluororubber, polysulfide rubber, foams thereof, and the like.

The hardness of the elastic member 4 is preferably 20-80, more preferably 30-60 in type A durometer. By setting the hardness of the elastic member 4 to 20 or more, the elastic member 4 is less likely to be compressed during screwing, and high sound insulation can be obtained. By setting the hardness of the elastic member 4 to 80 or less, the vibration of the sound transmitted to the elastic member 4 does not become too large, and high sound insulation can be maintained.

Next, the partition structure 10 using the partition unit 1 will be described. 3 is a partial perspective view of the partition structure 10, FIG. 4 is a vertical sectional view of the partition structure 10, and FIG. 5 is a horizontal sectional view of the partition structure 10. As shown in FIG. As shown in FIG. 4, the partition structure 10 of this embodiment includes a plurality of partition units 1 arranged horizontally in the interior space of the building, and fixed to the floor surface t1 to support the lower portions of the plurality of partition units 1. It is provided with a lower runner 11 and an upper runner 12 fixed to the ceiling surface t2 and supporting the upper parts of the plurality of partition units 1. - 特許庁As shown in FIG. 5, the rib members 3 at both ends of each partition unit 1 are positioned close to the rib members 3 of the adjacent partition unit 1 along the longitudinal direction.

Both the upper runner 12 and the lower runner 11 are L-shaped steel materials long in the penetrating direction in FIG. A pair of upper runners 12 are fixed to the ceiling surface t2 with pins 13 for concrete so that the horizontal pieces 12b are directed inward with respect to the vertical pieces 12a. A pair of lower runners 11 are fixed to the floor surface t1 with pins 13 for concrete so that the horizontal pieces 11b face outward with respect to the vertical pieces 11a.

The partition unit 1 is supported from the outside by the upper runners 12 and supported from the inside by the lower runners 11 . A pair of a plurality of partition units 1, 1 arranged in the lateral direction are supported and attached to upper runners 12 and lower runners 11 with their rear surfaces 2a, 2a opposed to each other.

The upper end of the rib member 3 of the partition unit 1 and the ceiling surface t2 are kept apart, and the lower end of the rib member 3 and the floor surface t1 are kept apart. Therefore, it is possible to further improve the effect of suppressing the propagation of vibration and heat in adjacent living spaces.

A sound-absorbing material/heat-insulating material 14 is attached by pins (not shown) attached to the rib member 3 so as to be sandwiched between the partition units 1, 1 whose rear surfaces face each other. Rock wool or ceramics is applied to the inner side of the plurality of partition units 1 arranged in the horizontal direction so as to cover the horizontal pieces 12b of the upper runners 12 at the locations spaced from the ceiling surface t2 on the upper side of the rib member 3. A noncombustible material 15 such as wool is attached continuously in the lateral direction. A noncombustible material 15 such as rock wool or ceramic wool is also applied to the inner side of the plurality of partition units 1 arranged in the horizontal direction, in the same manner as the upper side, where the rib member 3 is spaced from the floor surface t1 on the lower side. attached to the

As shown in FIG. 4, the vertical piece 11a of one (left) lower runner 11 is screwed to the rib member 3 from the inside. A vertical piece 11a of the other (right) lower runner 11 is screwed to the rib member 3 from the outside. Such a screw-fixed form is associated with the process of installing the partition unit 1, and can be changed as appropriate. Sealing materials 16 are provided on the upper and lower sides of the partition panel member 2 . A gypsum board 17 is attached to the surface 2b of the partition units 1 arranged in the horizontal direction, and forms a wall surface of the room. In this way, the lower part of the partition unit 1 is fixed to the lower runner 11, and the upper part of the partition unit 1 is fitted into the upper runner 12 at the same time.

FIG. 6 is a partial cross-sectional view of the partition structure 10 to which the correction plate 18 is attached and a perspective view of the correction plate 18. FIG. A correction plate 18 is attached so as to straddle the inner side of the joint part m1 of the partition panel member 2 of two adjacent partition units 1 among the plurality of partition units 1 arranged in the horizontal direction. The correction plate 18 is made of a steel plate and is composed of a base plate 19 and a fixing piece 20 formed by bending the base plate 19 .

The base plate 19 is sandwiched between the partition panel member 2 and the rib member 3 so as to straddle the joint m1 of the adjacent partition panel members 2, and the fixing piece 20 is screwed to the rib member 3. - 特許庁The locations and number of mounting the correction plates 18 are appropriately set. By attaching the correction plate 18, the surfaces 2b of the adjacent partition panel members 2 are aligned, and the occurrence of a step at the joint portion m1 can be prevented. Even if the partition panel member 2 is about to warp, the presence of the correction plate 18 acts to align the surfaces 2b of the adjacent partition panel members 2, preventing the partition panel member 2 from warping. can be prevented.

The correcting plate may have any shape as long as it can prevent the step of the joint m1. For example, as shown in FIG. 10(a), the correction plate 24 formed in an H shape when viewed from the front may be turned over so that the elastic members 4 of the adjacent partition panel members 2 are inserted into the two concave portions 24a. In this shape, the concave portion 24a serves as a relief portion for positioning the elastic member 4, and the correction plate 24 does not move vertically. Since there is no fixing piece for attaching to the rib member 3, a screw fastening process is not required. Thus, the correction plate may have any shape as long as the base plate to be corrected can be held between the partition panel member 2 and the rib member 3 .

The partition structure 10 using the partition unit 1 is constructed, for example, as follows. First, the upper runner 12 and the lower runner 11 on one side (the left side in FIG. 4) are attached to the ceiling surface t2 and the floor surface t1, respectively. The vertical piece 12a of the upper runner 12 is inserted into the gap between the upper part of the partition panel member 2 on one side and the upper part of the rib member 3 by inserting the partition unit 1 obliquely. After confirming the insertion, the lower part of the partition panel member 2 is applied to the lower runner 11, and the partition unit 1 is erected on the floor surface t1. The vertical piece 11a of the lower runner 11 is screwed to the partition panel member 2 from the inside.

A noncombustible material 15 is filled in the upper gap of the partition unit 1 so as to cover the horizontal piece 12b of the upper runner 12.例文帳に追加Similarly, the gap on the lower side of the partition unit 1 is also filled with the incombustible material 15 so as to cover the horizontal piece 11b of the lower runner 11 . A pin (not shown) for fixing the sound absorbing/heat insulating material 14 is attached to the rib member 3 of the partition unit 1, and the noncombustible material 15 is fixed with the pin.

After that, the upper runner 12 and the lower runner 11 on one side (the right side in FIG. 4) and the partition unit 1 are attached in the same procedure as on the right side. A plurality of partitioning units 1 arranged in the horizontal direction are attached so as to face each other, screwed from the inside of the room, then a gypsum board 17 is attached to the surface 2b of the partition panel member 2, and further wallpaper is pasted for finishing. This construction procedure is an example, and can be arbitrarily set according to the form of the partition unit 1 and the partition structure 10 .

The partition unit 1 that constitutes the partition structure 10 of the present embodiment includes a partition panel member 2, a rib member 3 that reinforces the partition panel member 2, and an elastic member sandwiched between the partition panel member 2 and the rib member 3. 4. Since it is not necessary to install a metal stud in advance, it is easy to install and has high workability. The partition panel member 2 and the rib member 3 can be made of different materials making use of their respective material properties (the strength required for the partition panel member 2 and the strength required for the rib member 3), and the cost does not increase.

Since the elastic member 4 sandwiched between the partition panel member 2 and the rib member 3 is sandwiched in a state in which it is not elastically deformed, the force applied between the two members 2 and 3 is relaxed. Warping due to the difference in expansion ratio of 3 can be suppressed. Therefore, work for preventing phenomena such as occurrence of a large step in the joint m1 and opening of the joint m1 becomes unnecessary, and workability can be improved. Furthermore, since it is only necessary to attach the partition unit 1 having the partition panel member 2 and the rib member 3 for reinforcing the partition panel member 2 to the partition part, the amount of work at the construction site can be reduced and the cost can be reduced.

Furthermore, since the rib member 3 of the partition unit 1 is not completely fixed to the upper runner 12 and the upper part of the partition unit 1 is simply fitted into the upper runner 12, the rib member 3 is not attached to the upper runner 12. It can be easily installed just by fitting it in, and the workability is greatly improved. This can reduce costs. Since the rib member 3 is not completely fixed to the upper runner 12 and the partition unit 1 easily follows the displacement when the interlayer is displaced, the earthquake resistance can also be improved.

The present invention is not limited to the above embodiments, and the shape, dimensions, mounting method, etc. of the partition panel member and the rib member can be appropriately changed according to the specifications for partitioning the interior space of the building. FIG. 7 is a sectional view showing a modification of the rib member 3. As shown in FIG. As illustrated, the rib member 3 may have a U-shaped, L-shaped, C-shaped, circular, triangular, or polygonal cross section.

When using a rib member having a U-shaped cross section or a C-shaped cross section, as shown in FIG. , 3. A heat insulating material 14 may be attached between the two rib members 3 , 3 . In this case, the work of attaching the heat insulating material 14 at the site can be saved, so that workability can be further improved.

The mounting position of the rib member can be arbitrarily set as long as the correction plate can be mounted. For example, the shape of the upper runner may be a U-shaped upper runner 21 as shown in the center view of FIG. 9, or an L-shaped angle 22 may be used as an upper anchor as shown in the right view of FIG. The shape of the lower anchor is similar. In the above embodiment, the rib member is attached in the vertical direction, but as shown in FIG. may be installed. If the rib members 26 are attached obliquely, the number of attachments is reduced and workability is improved.

The partition unit according to the present invention and the partition structure using this partition unit can be modified within the technical scope described in the claims. Other members provided as necessary in the partition structure using the partition unit may be of any form as long as they do not impair the effects of the present invention.

REFERENCE SIGNS LIST 1 partition unit 2 partition panel member 2a rear surface 2b front surface 3, 26 rib member 4 elastic member 5 fixing means 10 partition structure 11 lower runner 12 upper runner 13 pins for
14 sound absorbing material/heat insulating material 15 noncombustible material 16 sealing material 17 gypsum board 18, 24 correction plate 19 base plate 20 fixing piece 21 upper runner 22 L-shaped angle m1 joint t1 floor surface t2 ceiling surface

Claims (5)

a partition panel member that partitions the interior space of the building;
a rib member fixed along the rear surface of the partition panel member with a gap from the partition panel member and extending in one direction to reinforce the partition panel member;
a plurality of elastic members that are formed in the form of a small sheet having a size corresponding to the width of the rib member and are sandwiched between the partition panel member and the rib member in a non-elastically deformed state; The plurality of elastic members are provided at intervals along the longitudinal direction of the rib member,
A partition unit in which a force applied between the two members is reduced by the plurality of elastic members. a plurality of partition units arranged horizontally in the interior space of the building;
a lower runner that is fixed to the floor surface and supports the lower part of the plurality of partition units;
an upper runner that is fixed to the ceiling surface and supports the upper part of the plurality of partition units, the partition structure comprising:
Each partition unit is
a partition panel member that partitions the interior space of the building;
a rib member fixed along the rear surface of the partition panel member with a gap from the partition panel member and extending in one direction to reinforce the partition panel member;
a plurality of elastic members that are formed in the form of a small sheet having a size corresponding to the width of the rib member and are sandwiched between the partition panel member and the rib member in a non-elastically deformed state; The plurality of elastic members are provided at intervals along the longitudinal direction of the rib member,
A partition structure in which a force applied between the two members is reduced by the plurality of elastic members. 3. The partition structure according to claim 2, further comprising a correction plate attached so as to straddle the joint portion of the partition panel members of two adjacent partition units among the plurality of partition units to correct the step of the joint portion. . 3. A space is provided between the top end of the rib member of each partition unit and the ceiling surface, and the bottom end of the rib member and the floor surface are spaced apart. Partition structure as described. 3. The partition structure according to claim 2, wherein the lower part of each partition unit is fixed to the lower runner, and the upper part of each partition unit is fitted into the upper runner.

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