JP2011012472A - Side ditch with slit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a side ditch with a slit, having a structure supporting a cantilever beam without using a detachable interval holding implement.SOLUTION: In this side ditch with the slit including a hollow passage 1 within, forming the slit 21 for communicating the hollow passage 1 with the outside on an upper face 2, and having closed cross section, a pair of interval holding parts 6, 7 bringing mutual end faces 61, 71 into face contact without connecting them are provided on opposing slit side faces 221, 231 of the cantilever beams 22, 23 constituted by dividing the upper face 2 by the slit 21.

Description

  The present invention relates to a side groove with a slit having a closed cross section in which a hollow path is provided inside and a slit is formed on an upper surface to communicate the hollow path with the outside.

  The side groove with a slit has a configuration in which a hollow path is provided inside, and a slit that connects the hollow path and the outside is formed on the upper surface.For example, as drainage channels on both sides of the road, rainwater that falls on the road is introduced from the slit on the upper surface to the inside. Pour into a hollow channel and drain. In order to form the slit, the upper surface is divided into a pair of cantilevers facing the side surfaces of the slit. Since each cantilever is supported on the side surface of the side groove, it is possible to prevent deformation in the facing direction of the slit side surface (in the orthogonal direction of the extension of the slit in the horizontal plane) and in the vertical direction (in the orthogonal direction of the extension of the slit in the vertical plane). Thus, the side surface of the side groove is formed thick. This has led to the problem that a large amount of material such as concrete is required to manufacture the side groove with slits, and that it becomes heavy. Therefore, in order to assist the support of the cantilever beam by the side surface of the side groove, as seen in Patent Document 1, a spacing holder is proposed that is inserted into the slit and suppresses deformation in the facing direction of the slit side surface of the cantilever beam. Has reached.

  Patent Document 1 discloses a wedge-shaped interval holder (Patent Document 1 [Claim 1]). A specific spacing holder is formed of “a flexible member such as rubber, plastic, etc., and both side surfaces thereof are provided with an uneven surface removal prevention surface 5 for preventing removal after attachment” (patent) Literature 1 [Claim 2] [0012] [FIG. 3]). Here, the “wedge shape” is not clear because there is no description of a specific structure, but “the drop prevention surfaces 5 and 5 are locked to the slit chamfered portion 6 and the wedge-shaped interval holder 4 is pulled out. According to the description “Patent Document 1 [0013]” and FIG. 3 described above, the entire structure including the sharp lower end of the cross section that can be easily inserted into the slit and the side surface that is difficult to come out is referred to as “wedge shape”. It is said that it is expressing.

  The interval holder disclosed in Patent Document 1 is inserted into the slit by “striking the head with a striking tool 7 such as a hammer and biting” (Patent Document 1 [0013] [FIG. 6]). Further, the interval holder disclosed in Patent Document 1 is recovered by “pulling the wedge-shaped interval holder 4 which is difficult to be inserted into the slit 3 by the extraction tool 8 or the like” (Patent Document 1 [0014] [FIG. 7]). By using such a spacing holder of Patent Document 1, the side surface of the side groove can be thinned, the amount of concrete used can be reduced, the manufacturing cost can be reduced, and the slit (more precisely, the cantilever beam) can be damaged. In addition, an effect of facilitating transportation work and laying work accompanying weight reduction can be obtained (Patent Document 1 [0015]).

JP 2000-355969 A

  The spacing holder disclosed in Patent Document 1 contributes to the thinning of the side surface of the side groove that supports the cantilever and brings various effects. However, due to being a separate member from the side groove with the slit, There is a problem like this. First, the interval holder requires labor that must be inserted into the slit later. The labor and time required to insert the spacing tool into the slit cannot be ignored if the number of side grooves with slits increases. This labor and time problem can also occur in the operation of recovering the spacing holder from the slit. Moreover, since a space | interval holder is a separate member from the side groove | channel with a slit, and it will insert in a slit as needed, there also exists a problem which needs to manage and store separately from a side groove | channel with a slit. In order to develop a structure that can stably support a cantilever beam without using a detachable spacer, we investigated a side groove with a slit.

  What was developed as a result of the study is a cantilever constructed by dividing the upper surface by a slit in a side groove with a slit with a closed cross section in which a hollow path is provided inside and a slit is formed on the upper surface to connect the hollow path and the outside. It is a side groove | channel with a slit which provided a pair of space | interval holding | maintenance part which makes a surface contact, without couple | bonding a mutual end surface on the slit side surface which a beam opposes. A pair of spacing holding portions provided on the opposing slit side surfaces engage with each other in the opposing direction of the slit side surfaces by bringing the opposing end surfaces into contact with each other, and each cantilever is deformed in the opposing direction of the slit side surfaces. This prevents or prevents the cantilever from being supported stably even by a thin wall surface. However, since the end faces are not joined, there is no fear of causing stress concentration in each interval holding portion.

  The interval holding portion may be physically contacted without being bonded, and may be made of concrete integrally with the slit side groove, or may be made of a resin separate from the slit side groove, Must be one. At this time, for example, it is also conceivable that the end face of one spacing member is made flat while the other spacing member is sharpened and the end part is brought into point contact with the flat surface. However, it is not realistic to make point contact between the concrete interval holding portions that are integral with the slit side grooves. Further, in order to stably support the cantilever beam, it is preferable that the interval holding portion is in surface contact no matter how small the end face is. From this point of view, it can be considered that the end face of one gap holding part is made flat while the other gap holding part is sharpened. However, even in this case, the end face is strictly brought into surface contact and is included in the present invention. It is.

  A specific space | interval holding | maintenance part can be comprised as a pair of protrusion part which protrudes from a slit side surface. The protruding amounts of the pair of protrusions may be equal or either one may be large, but both protrusions protrude from the slit side surface. Moreover, the specific space | interval holding | maintenance part can also be comprised from the protrusion which protrudes from one side of a slit side surface, and the plane set to the other side of a slit side surface. The protrusion protruding from one of the slit side surfaces is the protrusion amount of the pair of protrusions, and the plane set on the other side of the slit side surface is the protrusion not protruding from the slit side surface (that is, the protrusion amount is “0”). ]) And is continuous with the side surface of the slit.

  The interval holding part of the present invention engages in the facing direction of the slit side surface by bringing the end face parallel to the vertical direction into surface contact, and basically suppresses the cantilever beam from being deformed in the facing direction of the slit side surface. To prevent. However, the interval holding part of the present invention forms end faces inclined in one or both of the vertical direction and the horizontal direction (including the facing direction of the slit side surface and the extending direction described later) in a transfer relationship with each other. By bringing the end faces into surface contact without being coupled, they engage in the vertical direction, the facing direction of the slit side surface, or the extending direction of the slit side surface (the extending direction of the slit in the horizontal plane), and not only the facing direction of the slit side surface. The cantilever can also be suppressed or prevented from being deformed in the vertical direction or in the extending direction of the slit side surface. “End face inclined in either or both of the vertical direction and the horizontal direction” means an end face inclined in one or all directions of the perpendicular direction, the opposing direction of the slit side surface, the extending direction of the slit side surface, or the orthogonal direction. means.

  Similarly, the interval holding portion of the present invention forms end surfaces that are convex or concave in either the vertical direction or the horizontal direction or both in a transfer relationship, and fits the end surfaces together so that they are in contact with each other. Engages in the vertical direction, the opposite direction of the slit side surface, or the extending direction of the slit side surface, and prevents the cantilever from deforming not only in the opposing direction of the slit side surface but also in the vertical direction or the extending direction of the slit side surface. Or it can be prevented. “End face that is uneven in either or both of the vertical direction and the horizontal direction” forms a cross section that is uneven in any or all of the perpendicular direction, the opposing direction of the slit side surface, or the extending direction of the slit side surface in an orthogonal relationship. It means the end face. Each of the small end surfaces of each convex or concave end surface may be inclined in the vertical direction or the horizontal direction or both.

  Here, if at least one of the interval holding portions is made of a resin separate from the side groove with a slit, it is easy to make the surface contact without joining the end faces. However, if the pair of spacing members are made of concrete that is integral with the slit side groove, it is difficult to make surface contact without joining the end faces. In view of this, it is preferable that the spacing member is provided between the end surfaces with a partition material that is brought into surface contact without being coupled to at least one of the end surfaces. The partition material may be in surface contact without being coupled to at least one of the end surfaces, but may be in surface contact without being coupled to any of the end surfaces. The partition material may be configured as a partition block having a thickness in addition to a partition plate interposed between opposing end surfaces, leaving a gap that is almost narrow enough to contact.

  In the case of using a partition material, the interval holding unit forms an end surface inclined in one or both of the vertical direction and the horizontal direction on one or both sides, and the partition material that is in surface contact without being coupled to at least one of the end surfaces. It may be interposed in between. In this case, the partition member has a thickness and becomes a partition block having a pair of contact surfaces corresponding to the end surfaces of the protrusions, and the contact surfaces are formed in different shapes according to the corresponding end surfaces. Specifically, if the contact surface of the partition block is a vertical surface and an inclined surface, one end surface of the pair of protrusions is a vertical surface and the other end surface of the pair of protrusions is an inclined surface. When the other of the pair of protrusions is a flat surface, the flat surface is continuous with the side surface of the slit. Therefore, for example, the partition block is appropriate when the slit has a cross-sectional shape that is open downward.

  Similarly, the interval holding portion is a partition that forms one or both end surfaces that are convex or concave in one or both of the vertical direction and the horizontal direction, and is fitted and connected to at least one of the end surfaces. A material may be interposed between the end faces. Also in this case, the partition material has a thickness and becomes a partition block having a pair of contact surfaces corresponding to the end surfaces of the respective protrusions, and the contact surfaces are formed in different shapes according to the corresponding end surfaces. Specifically, if the contact surface of the partition block is a vertical surface and an uneven surface, one end surface of the pair of protrusions is a vertical surface, and the other end surface of the pair of protrusions is an uneven surface. Each convex or concave small end surface of each of the contact surface which is a concave and convex surface and the corresponding concave and convex end surface may be inclined in either or both of the vertical direction and the horizontal direction.

  The space | interval holding | maintenance part in this invention is divided | segmented corresponding to the slit side surface which a cantilever opposes, and is corresponded to the space | interval holder provided integrally with each slit side surface. From this, the side groove with a slit is reduced in thickness, and the amount of concrete to be used is reduced, thereby providing a side groove with a slit that is inexpensive and has improved workability during transportation and construction by weight reduction. And since the interval holding part is provided integrally with the side surface of the slit, it does not take the labor and labor of installation or collection, and the effect of improving the handleability that does not require labor such as inventory management of another member. Bring. This effect is achieved not only in the concrete interval holding part integrated with the slit side groove, but also in the resin side and other interval holding parts separately from the slit side groove when the slit side groove is formed on the side surface of the slit. And fixed.

  In addition, the interval holding portion in the present invention suppresses or prevents the cantilever from deforming in the opposite direction of the side surface of the slit, as well as further tilting the end surface or making the cantilever more uneven. This brings about an effect of improving the shape retaining property that can suppress or prevent the deformation in the vertical direction or the extending direction of the side surface of the slit. This effect can be obtained not only in the interval holding portion including a pair of protrusions but also in a configuration in which a partition material is interposed between the protrusions. When a partition material is used, the end surfaces of the protrusions can be made different, for example, flat and inclined, and inclined and uneven. Such a distance holding portion can eliminate or simplify the reinforcing material of the cantilever, and can further improve the above-described weight reduction.

It is a perspective view showing an example of a side groove with a slit to which the present invention is applied. It is a front view showing the side groove with a slit of this example. It is a top view showing the side groove with a slit of this example. It is a left view showing the side groove with a slit of this example. FIG. 5 is an enlarged view of a portion indicated by an arrow A in FIG. It is a partial exploded perspective view showing the space | interval holding | maintenance part of this example. FIG. 6 is an enlarged view corresponding to FIG. 5 illustrating another example of the interval holding unit. FIG. 6 is an enlarged view corresponding to FIG. 5 illustrating another example of the interval holding unit. FIG. 6 is an enlarged view corresponding to FIG. 5 illustrating another example of the interval holding unit. It is the elements on larger scale showing the space | interval holding | maintenance part of another example. FIG. 6 is an enlarged view corresponding to FIG. 5 illustrating another example of the interval holding unit. FIG. 11 is an enlarged plan view corresponding to FIG. 10 showing another example of the interval holding unit. FIG. 6 is an enlarged view corresponding to FIG. 5 illustrating another example of the interval holding unit. FIG. 6 is an enlarged view corresponding to FIG. 5 illustrating another example of the interval holding unit. FIG. 6 is an enlarged view corresponding to FIG. 5 illustrating another example of the interval holding unit. FIG. 6 is an enlarged view corresponding to FIG. 5 illustrating another example of the interval holding unit. FIG. 6 is an enlarged view corresponding to FIG. 5 illustrating another example of the interval holding unit.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The concrete side grooves with slits to which the present invention is applied have an appearance that is the same as that of conventional side grooves with slits, as shown in FIGS. That is, the hollow path 1 formed inside has a substantially oval cross section surrounded by the upper surface 2, the front side wall surface 3, the rear side wall surface 4, and the bottom surface 5, and the upper surface 2 is divided into front and rear by the slits 21. A beam 22 and a rear cantilever beam 23 are formed. The side groove with a slit in this example has a long overhang of the front cantilever 22 and a short overhang of the rear cantilever 23. Although not shown, the side groove with a slit in this example is installed with the long cantilever front cantilever 22 facing the road and the slit 21 being close to the road shoulder end.

  The front side cantilever 22 and the rear side cantilever 23 face the end surfaces 61 and 71 of the front side gap holding part 6 and the rear side gap holding part 7 provided on the front side slit side 221 and the rear side slit side 231 facing each other. Contacting and deforming in the opposite direction of the slit side surface (see coordinates in each figure) is suppressed or prevented. Thereby, the front side wall surface 3 and the rear side wall surface 4 which support the front side cantilever 22 and the rear side cantilever 23 can be made thin, and the saving of concrete and weight reduction are implement | achieved. The side groove with a slit of this example is provided with a front concave portion 31 and a rear concave portion 41 on the front side wall surface 3 and the rear side wall surface 4 respectively, further saving the concrete and reducing the weight. Moreover, if the front side wall surface 3 and the rear side wall surface 4 can be made thin, the cross-sectional area of the hollow passage 1 is increased while keeping the same size as the conventional grooved side groove, and the amount of drainage per unit time proportional to the cross-sectional area is increased. It can also be increased.

  The slit 21 in this example has a cross-sectional C shape in which the interval increases with the front slit side surface 221 and the rear slit side surface 231 facing each other downward. The front gap holding section 6 and the rear gap holding section 7 have a total of six pairs, one pair at each end in the extending direction of the slit 21, two pairs arranged side by side in the center in the extending direction, and one pair in the middle between the both ends and the center. A pair is provided (see FIG. 2). As shown in FIGS. 5 and 6 (decomposed for convenience of explanation), the front space holding portion 6 and the rear space holding portion 7 in this example are a concrete surface such as a front slit side surface 221 and a rear surface. This is a projection having a trapezoidal shape in a front view formed integrally with the side slit side surface 231, and this example is mirror-symmetrical in the opposing direction of the slit side surface (that is, the front side spacing holding portion 6 and the rear side spacing holding portion 7 have the same shape). ). In this way, the slit 21 has a cross-sectional shape, and the front-side interval holding portion 6 and the rear-side interval holding portion 7 have a trapezoidal shape in front view, so that the mold inserted into the slit 21 and the adjacent front-side interval holding portion 6 and All the molds inserted between the rear space holding portions 7 are pulled out downward.

  The present invention is characterized in that the front space holding portion 6 and the rear space holding portion 7 are brought into surface contact with each other without coupling the end surfaces 61 and 71 to each other. However, as in this example, if both the front side gap holding part 6 and the rear side gap holding part 7 are made of concrete, it is practically difficult to make surface contact without combining them. Therefore, in this example, a thin resin partition plate 8 is interposed between the end surfaces 61 and 71 of the front side spacing unit 6 and the rear side spacing unit 7, so that the front side spacing unit 6 and the rear side spacing unit are provided. 7 are in surface contact with each other without joining the end surfaces 61 and 71 (exactly, for example, the end surface 61 is in surface contact with the partition plate 8 and is in contact with the other end surface 71 through the partition plate 8. ). The partition plate 8 is sandwiched between the end surfaces 61 and 71 when manufacturing the side groove with the slit including the front side gap holding part 6 and the rear side gap holding part 7, so that the front side gap holding part 6 and the rear side gap holding part 7. Between the end faces 61 and 71 of the

  The partition plate 8 is not bonded to the end surfaces 61 and 71 of the front side spacing unit 6 and the rear side spacing unit 7, but as described above, each end surface 61 of the front side spacing unit 6 and the rear side spacing unit 7 is used. , 71, the position is maintained by friction with the concrete immediately after the production of the side groove with a slit, but there is a possibility that it will fall off due to deterioration over time. Therefore, for example, a small hole 81 is provided in the partition plate 8, and a small coupling portion is formed on a part of each end surface 61, 71 of the front interval holding portion 6 and the rear interval holding portion 7. The small hole 81 may be engaged and held in position. Even if the joint portion breaks and separates from each of the end surfaces 61 and 71 of the front side spacing holding part 6 and the rear side spacing holding part 7, the remaining part engages with the small hole 81 and holds the partition plate 8 in position. Let Further, a small protrusion or a recess may be provided on the surface of the partition plate 8, and the protrusion may be engaged with one of the end surfaces 61 and 71 of the front interval holding portion 6 and the rear interval holding portion 7 to hold the position.

  The front space holding portion 6 and the rear space holding portion 7 need only be brought into surface contact with each other without being connected to each other, and the protruding amounts thereof are different, or the end surfaces 61 and 71 are inclined. , It may be uneven. For example, as shown in FIG. 7, a front-side trapezoidal shape is used, and the configuration in which the partition plate 8 is interposed between the end surfaces 61 and 71 is the same as the above example, but the front-side spacing that protrudes from the front-side slit side surface 221 is maintained. The protrusion amount of the part 6 may be made relatively large, and conversely, the protrusion amount of the rear space holding part 7 protruding from the rear slit side surface 231 may be made relatively small. As will be described later, when only either the front space holding portion 6 or the rear space holding portion 7 is protruded, the rear space holding portion 7 is protruded from the rear slit side surface 231 of the front cantilever 22 having a short overhang. Although it is preferable, as long as both the front space | interval holding | maintenance part 6 and the rear side space | interval holding | maintenance part 7 are protruded, whichever may be protruded relatively large.

  More extremely, as shown in FIG. 8, the end surface 61 of the front space holding portion is flush with the front slit side surface 221, and only the rear space holding portion 7 is projected to bring the end surface 71 into surface contact with the end surface 61. You may do it. In this case, the rear space holding part 7 has a trapezoidal shape in front view, and the partition plate 8 is interposed between the end faces 61 and 71. When only either the front side spacing unit 6 or the rear side spacing unit 7 is projected, either the front side spacing unit 6 or the rear side spacing unit 7 may be structurally projected. However, the end surface 71 is placed on the front slit side 221 (the flush end surface 61) of the front cantilever 22 so that it can resist the load when the front cantilever 22 with a long overhang is displaced in the direction opposite to the slit side surface. It is preferable to project the rear space holding part 7 so that it can be supported by being brought into surface contact.

  In the present invention, as shown in FIG. 9, when the end surfaces 61 and 71 inclined in the vertical direction are formed in a transfer relationship, and the front space holding portion 6 is engaged with the rear space holding portion 7 from above. In particular, it is possible to suppress or prevent the front cantilever 22 from being deformed in the vertical direction. In this case, since the partition plate 8 is disposed obliquely, it is possible to prevent easy dropping without providing the small hole 81 or the like described above. Further, as seen in FIG. 10, end surfaces 61 and 71 inclined in the extending direction of the slit side surface are formed in a transfer relationship, and the front space holding portion 6 and the rear space holding portion 7 are engaged to the left and right. Then, it is possible to suppress or prevent the front cantilever 22 and the rear cantilever 23 from being deformed in the extending direction of the slit side surface. In this case, it is desirable to provide a small hole 81 or the like in the partition plate 8 in order to prevent the dropout. In addition, although illustration is omitted, if the end faces 61 and 71 inclined in the vertical direction and the horizontal direction are formed in a transfer relationship with each other, the front cantilever 22 and the rear cantilever 23 are in the vertical and horizontal directions. Deformation can also be suppressed or prevented. In this case, since the partition plate 8 is disposed obliquely, it is possible to prevent easy dropping without providing the small hole 81 or the like described above.

  Similarly, as shown in FIG. 11, if the end surfaces 61 and 71 that are uneven in the vertical direction are formed in a transfer relationship with each other, and the front space holding portion 6 and the rear space holding portion 7 are fitted to each other, It is possible to suppress or prevent the front cantilever 22 from being deformed in the vertical direction. In this case, since the partition plate 8 is bent in the vertical direction and interposed between the end surfaces 61 and 71, the partition plate 8 can be prevented from dropping without providing the small hole 81 or the like described above. Further, as seen in FIG. 12, end surfaces 61 and 71 that are concave and convex in the extending direction of the side surface of the slit are formed in a transfer relationship with each other, and the front side spacing holding part 6 and the rear side spacing holding part 7 are engaged to the left and right. Then, it is possible to suppress or prevent the front cantilever 22 and the rear cantilever 23 from being deformed in the extending direction of the slit side surface. In this case, it is desirable to provide a small hole 81 or the like in the partition plate 8 in order to prevent the dropout. In addition, although illustration is omitted, if the end surfaces 61 and 71 that are uneven in the vertical direction and the horizontal direction are formed in a transfer relationship, the front cantilever 22 and the rear cantilever 23 are in the vertical and horizontal directions. Deformation can also be suppressed or prevented. In this case, since the partition plate 8 is bent in the vertical direction and the horizontal direction and is interposed between the end surfaces 61 and 71, the partition plate 8 can be prevented from falling off without providing the small holes 81 and the like described above.

  Instead of the thin partition plate 8, as seen in FIGS. 13 to 17, partition blocks 9 that form different contact surfaces with respect to the end surfaces 61 and 71 may be used. For example, since it is necessary to prevent the partition block 9 from falling off as in the case of the partition plate 8 described above, a plane parallel to the vertical direction with respect to the end surface 61 of the front space holding portion 6 as shown in FIG. The partition block 9 having a contact surface that is uneven in the vertical direction with respect to the end surface 71 of the rear space holding portion 7 may be used. The partition block 9 can be prevented from falling off in the vertical direction because the contact surface that is uneven in the vertical direction is fitted to the end surface 71 of the rear space holding portion 7 in the transfer relationship. Although not shown in the drawing, the abutment surface that is uneven in the horizontal direction with respect to the end surface 71 of the rear space holding portion 7 while being a flat abutting surface parallel to the vertical direction with respect to the end surface 61 of the front space holding portion 6. The partition block 9 may be used, or the partition block 9 having a contact surface that is uneven in the vertical direction and the horizontal direction with respect to the end surface 71 of the rear space holding unit 7 may be used.

  Further, as seen in FIG. 15, the front space holding portion 6 is not protruded, and is a flat contact surface parallel to the front slit side surface 221 and the end surface 61 which is flush with the front side space holding portion 7. You may use the partition block 9 made into the contact surface uneven | corrugated to the orthogonal | vertical direction with respect to the end surface 71. FIG. The partition block 9 can be prevented from falling off in the vertical direction because the contact surface that is uneven in the vertical direction is fitted to the end surface 71 of the rear space holding portion 7 in the transfer relationship. Furthermore, the partition block 9 itself having a contact surface that is uneven in the vertical direction may be inclined in the vertical direction. Specifically, as shown in FIG. 16, the contact surface in transfer relation with the end surface 61 of the front space holding portion 6 that is uneven in the direction parallel to the front slit side surface 221, and parallel to the front slit side surface 221. A partition block 9 having a contact surface in surface contact with the end surface 71 of the rear space holding unit 7 is used. The partition block 9 has a contact surface that is uneven in the vertical direction fitted to the end surface 61 of the front space holding portion 6 that has a transfer relationship, and a contact surface that is inclined in the vertical direction has a transfer relationship. 7 is engaged with the end face 71, so that it can be prevented from falling off in the vertical direction.

  In addition, the partition block 9 may have both contact surfaces uneven, and in this case, unlike the partition plate 8, the contact surfaces can be made uneven. Specifically, as seen in FIG. 17, the contact surface in the transfer relationship with the end surface 61 of the front space holding portion 6 that is uneven in the vertical direction and whose middle stage is recessed forward, and also uneven in the vertical direction. Thus, the partition block 9 having the end surface 71 of the rear space holding portion 7 whose middle step is recessed rearward and a contact surface in a transfer relationship is used. Since the partition block 9 is fitted into the end surface 61 of the front space holding portion 6 and the end surface 71 of the rear space holding portion 7 whose transfer surfaces are in a transfer relationship, the partition block 9 is dropped in the vertical direction. Can be prevented. Thus, the partition block 9 has a higher degree of structural freedom than the partition plate 8 and has the advantage that it can be prevented from falling off relatively easily.

1 Hollow path 2 Upper surface
21 Slit
22 Front cantilever
221 Front slit side
23 Rear cantilever
231 Rear slit side face 6 Front side gap holding part 7 Rear side gap holding part 8 Partition plate 9 Partition block

Claims (6)

In a side groove with a slit of a closed cross section in which a hollow path is provided inside and a slit is formed on the upper surface to communicate the hollow path and the outside.
A side groove with a slit, characterized in that a pair of interval holding portions that are in surface contact with each other without joining the end faces are provided on opposite slit side surfaces of a cantilever beam formed by dividing an upper surface by a slit. The side groove with a slit according to claim 1, wherein the interval holding portion is a pair of protrusions protruding from the side surface of the slit. The side groove with a slit according to claim 1, wherein the interval holding portion is a protrusion protruding from one side of the slit side surface and a plane set on the other side of the slit side surface. The gap holding portion is provided with a slit according to any one of claims 1 to 3, wherein end portions inclined in either or both of the vertical direction and the horizontal direction are formed in a transfer relationship with each other, and the end surfaces are brought into surface contact without being coupled to each other. Side groove. The interval holding portion is formed in a transfer relationship with end surfaces that are concave or convex in either the vertical direction or the horizontal direction, respectively, and the end surfaces are fitted to each other without being joined to each other to be in contact with each other. Side groove with slit as described. The slit holding side groove according to any one of claims 1 to 5, wherein the interval holding part interposes between the end faces a partition material that is brought into surface contact without being coupled to at least one of the end faces.

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