JP7634261B2 - Foundation inspection hatch and its installation method - Google Patents

Description

The present invention relates to a foundation inspection hatch for a building (i.e., a pedestrian access point through which people can pass), in particular to a foundation inspection hatch that is installed integrally with the foundation when concrete is poured to form the foundation, and to a method for installing the same.

In recent years, it has become mandatory to provide access or inspection hatches in foundations to allow inspection of areas under floors, especially under bathrooms. This type of foundation inspection hatch can be of the embedded type, where the inspection hatch is installed integrally with the foundation by pouring concrete into a formwork in which the inspection hatch is placed, or of the retrofit type, where the inspection hatch is installed in a notch formed in the foundation.

The applicant has previously proposed a type of door that is particularly effective as a recessed type foundation inspection hatch, which includes a frame and a lid that has insulating properties and can be fitted to the frame, has a locking mechanism that holds the lid against the frame, and has a front surface covered with masking tape when the lid is held against the frame (see Patent Document 1).

Patent No. 5281813

In the foundation inspection hatch described in Patent Document 1, the front is covered with masking tape, so that removing the masking tape after the foundation is formed can prevent formwork release agent and concrete slag from adhering and contaminating the lid and frame. However, because the front of the foundation inspection hatch is covered with masking tape, it looks less appealing after installation, and it requires the effort of removing the masking tape and disposing of the removed tape.

The object of the present invention is to provide a built-in foundation inspection hatch that can reduce contamination caused by slag and release agents without the use of masking tape and improve the appearance after installation.

The foundation inspection hatch of the present invention is a foundation inspection hatch that is installed so as to become one with the foundation when concrete is poured to form the foundation, and comprises a frame body having an opening, and a cover body that can be fitted into the opening, and at least one of the front and back surfaces of the frame body is provided with a convex strip portion extending along the periphery of the opening, the frame body and the convex strip portion are made of foamed resin, and the convex strip portion and the frame body are integrated .

According to this, when the foundation inspection hatch is installed in the formwork for pouring concrete, the convex stripe is pressed by the inner surface of the formwork and can be deformed. Therefore, a gap through which concrete slag penetrates from the periphery of the frame body to the inside of the convex stripe is unlikely to occur between the frame body and the inner surface of the formwork. Therefore, it is possible to reduce the adhesion of the slag to the inside of the convex stripe of the frame body and staining. It is also possible to reduce the adhesion of the release agent adhered to the inner surface of the formwork to the inside of the convex stripe of the frame body and staining. In this way, even if the foundation inspection hatch is not covered with masking tape or the like, it is possible to reduce the adhesion of the release agent or concrete slag to the inside of the convex stripe of the foundation inspection hatch and staining. As a result, since it is not necessary to use masking tape, the work of peeling off the masking tape is eliminated, and furthermore, it is possible to obtain a foundation inspection hatch with improved appearance after installation, which does not require disposal of the peeled off masking tape. In addition, since concrete slag is unlikely to penetrate into the opening, it is possible to prevent the cover body from being attached to the frame body and becoming difficult to remove. In addition, the convex rib portion is less likely to fall off the frame body. In addition, it is no longer necessary to produce the convex rib portion and the frame body in separate processes, which makes it possible to reduce manufacturing costs. In addition, since the convex rib portion is made of foamed resin, it is easily crushed by the inner surface of the formwork. Therefore, it is no longer necessary to remove the convex rib portion to make it flush with the side of the foundation.
In the present invention, the protruding ridges are preferably provided along the outer periphery of the front and/or back surface of the frame body. By providing the protruding ridges along the outer periphery, it is possible to effectively prevent a gap from being generated between the protruding ridges and the inner surface of the formwork when the protruding ridges are effectively crushed inside the formwork, and a more beautiful finish can be achieved.

In the present invention, the convex rib is preferably semicircular or triangular in cross section. In other words, it is preferable that the tip of the convex rib is in linear contact with the inner surface of the formwork and pressed against it. This makes it easier to crush the convex rib with the inner surface of the formwork. This makes it even less likely that gaps will form between the frame body and the inner surface of the formwork, allowing concrete slag to seep in from around the frame body to the inside of the convex rib. Furthermore, when the formwork is removed, the convex rib is effectively absorbed into the surface of the frame body, resulting in a neater finish.

The method for installing a foundation inspection hatch of the present invention comprises a placement step of placing the foundation inspection hatch, which comprises a frame body made of foamed resin having an opening and a cover body that can fit into the opening, and which has a foamed resin convex strip portion made of foamed resin extending along the periphery of the opening and integrated with the frame body on at least one of the front and back surfaces of the frame body, within a formwork by pressing the convex strip portion against the inner surface of the formwork, and a pouring step of pouring concrete into the formwork.

According to this, in the arrangement step, the convex rib portion is pressed by the inner surface of the formwork and deformed. Therefore, a gap through which concrete slag penetrates from the periphery of the frame body to the inside of the convex rib portion is unlikely to occur between the frame body and the inner surface of the formwork. Therefore, even if concrete is poured into the formwork in the pouring step, it is possible to reduce the adhesion of the slag to the inside of the convex rib portion of the frame body and dirt. It is also possible to reduce the adhesion of the release agent attached to the inner surface of the formwork to the inside of the convex rib portion of the frame body and dirt. In this way, even if the foundation inspection hatch is not covered with masking tape or the like, it is possible to reduce the adhesion of the release agent or concrete slag to the inside of the convex rib portion of the foundation inspection hatch and dirt. As a result, since it is not necessary to use masking tape, the work of peeling off the masking tape is eliminated, and furthermore, it is possible to obtain a foundation inspection hatch with improved appearance after installation, which does not require disposal of the peeled off masking tape. In addition, since concrete slag is unlikely to penetrate into the opening, it is possible to prevent the cover body from being attached to the frame body and becoming difficult to remove. In addition, because the ridges are made of foamed resin, they can be easily crushed by the inner surface of the formwork, eliminating the need to remove the ridges to make them flush with the side of the foundation.

According to the foundation inspection hatch of the present invention, when the foundation inspection hatch is installed in a form for pouring concrete, the convex stripe is pressed by the inner surface of the form and can be deformed. Therefore, a gap through which concrete slag penetrates from the periphery of the frame body to the inside of the convex stripe is unlikely to occur between the frame body and the inner surface of the form. Therefore, it is possible to reduce the adhesion of the slag to the inside of the convex stripe of the frame body and staining. It is also possible to reduce the adhesion of the release agent adhered to the inner surface of the formwork to the inside of the convex stripe of the frame body and staining. In this way, even if the foundation inspection hatch is not covered with masking tape or the like, it is possible to reduce the adhesion of the release agent or concrete slag to the inside of the convex stripe of the foundation inspection hatch and staining. As a result, since it is not necessary to use masking tape, the work of peeling off the masking tape is eliminated, and furthermore, it is possible to obtain a foundation inspection hatch with improved appearance after installation, which does not require disposal of the peeled off masking tape. In addition, since concrete slag is unlikely to penetrate into the opening, it is possible to prevent the cover body from being attached to the frame body and becoming difficult to remove. In addition, the convex rib portion is less likely to fall off the frame body. In addition, it is no longer necessary to produce the convex rib portion and the frame body in separate processes, which makes it possible to reduce manufacturing costs. In addition, since the convex rib portion is made of foamed resin, it is easily crushed by the inner surface of the formwork. Therefore, it is no longer necessary to remove the convex rib portion to make it flush with the side of the foundation.
According to the installation method of the foundation inspection hatch of the present invention, in the placement step, the convex stripe is pressed by the inner surface of the formwork and deformed. Therefore, a gap through which concrete slag penetrates from the periphery of the frame body to the inside of the convex stripe is unlikely to occur between the frame body and the inner surface of the formwork. Therefore, even if concrete is poured into the formwork in the pouring step, it is possible to reduce the adhesion of the slag to the inside of the convex stripe of the frame body and dirt. It is also possible to reduce the adhesion of the release agent adhered to the inner surface of the formwork to the inside of the convex stripe of the frame body and dirt. In this way, even if the foundation inspection hatch is not covered with masking tape or the like, it is possible to reduce the adhesion of the release agent or concrete slag to the inside of the convex stripe of the foundation inspection hatch and dirt. As a result, since there is no need to use masking tape, the work of peeling off the masking tape is eliminated, and furthermore, it is possible to obtain a foundation inspection hatch with improved appearance after installation, which does not require disposal of the peeled off masking tape. In addition, since concrete slag is unlikely to penetrate into the opening, it is possible to prevent the cover body from being attached to the frame body and becoming difficult to remove. In addition, because the ridges are made of foamed resin, they can be easily crushed by the inner surface of the formwork, eliminating the need to remove the ridges to make them flush with the side of the foundation.

1 is an oblique view of a foundation inspection hatch according to a first embodiment of the present invention, viewed diagonally from the front. 2A is a perspective view of the frame shown in FIG. 1 as viewed obliquely from the front, and FIG. 2B is a perspective view of the frame as viewed obliquely from the rear. 2A is a perspective view of the cover shown in FIG. 1 as viewed obliquely from the front, and FIG. 2B is a perspective view of the cover as viewed obliquely from the rear. FIG. 2A is an explanatory diagram of when the foundation inspection hatch shown in FIG. 1 is placed within a formwork, and FIG. 2B is an explanatory diagram of when concrete is poured with the foundation inspection hatch installed within the formwork. FIG. 2 is a partial perspective view showing a foundation structure in which the foundation inspection hatch shown in FIG. 1 and the foundation are integrated. This is an oblique view of the foundation inspection hatch relating to the second embodiment of the present invention when viewed diagonally from the front. 7A is a perspective view of the frame shown in FIG. 6 as seen obliquely from the front, and FIG. 7B is a perspective view of the frame as seen obliquely from the rear. FIG. 7A is an explanatory diagram of when the foundation inspection hatch shown in FIG. 6 is placed within a formwork, and FIG. 7B is an explanatory diagram of when concrete is poured with the foundation inspection hatch installed within the formwork. FIG. 7 is a partial perspective view showing a foundation structure in which the foundation inspection hatch shown in FIG. 6 and the foundation are integrated.

The following describes the foundation inspection hatch 1 according to the first embodiment of the present invention with reference to Figures 1 to 3. The foundation inspection hatch 1 in this embodiment is a built-in type foundation inspection hatch that is installed integrally with the foundation when the foundation is formed.

As shown in Figure 1, the foundation inspection hatch 1 in this embodiment has a frame body 11 and a cover body 21. Note that Figure 1 shows the front-to-back direction A, the left-to-right direction B, and the up-to-down direction C when the foundation inspection hatch 1 is viewed from the front, and these directions will be reflected in the other figures in the following explanation.

As shown in FIG. 2(a), the frame body 11 has a frame portion 12 arranged at the rear and a support portion 13 arranged at the front and supporting the lid body 21. The frame portion 12 has a rectangular cylindrical shape and defines an opening 12a that opens in the front-rear direction A. As shown in FIG. 2(b), the frame portion 12 has two convex ribs 14 that protrude rearward from the rear surface (back surface) 12b and extend along the periphery of the opening 12a. These convex ribs 14 are formed integrally with the frame portion 12. The two convex ribs 14 are arranged at positions sandwiching the opening 12a in the left-right direction B. More specifically, they are arranged at both end edges of the rear surface 12b in the left-right direction B. The convex ribs 14 are formed over the entire length of the rear surface 12b in the up-down direction C. In this embodiment, the convex ribs 14 have a semicircular horizontal cross-sectional shape with a protruding height of 7 mm. In this embodiment, the protruding height of the ridges 14 is preferably set so that when placed in the formwork, they can be crushed by the inner surface of the formwork to the extent that they are nearly flush with the rear surface 12b of the frame body 11, for example, about 2 to 10 mm.

The support portion 13 has a support portion main body 13a formed integrally with the frame portion 12, and two engaged members 13b. The frame portion 12 and the support portion main body 13a constituting the frame body 11 are integrally molded. The frame portion 12 and the support portion main body 13a are made of soft resin. In this embodiment, they are made of foamed resin (for example, EPS: bead method polystyrene foam) and have thermal insulation properties. The frame portion 12 and the support portion main body 13a may be made of other soft resins having thermal insulation properties (for example, foamed resins used as thermal insulation materials such as polyurethane foam, polyethylene foam, and phenol foam, and rubbers such as butadiene rubber). The convex rib portion 14 is also made of the same material as the frame portion 12 (foamed resin: soft resin).

As shown in FIG. 2(a), the support body 13a is integrally formed on the front surface of the frame 12 and has an inverted U-shape. That is, the support body 13a has a horizontal portion 13a1 extending in the left-right direction B formed on the upper portion of the frame 12, and a pair of vertical portions 13a2 extending in the up-down direction C formed on both the left and right ends of the frame 12. Two recesses 13c defined by the locked member 13b are formed in each vertical portion 13a2. The recesses 13c open toward the inside in the left-right direction B. In addition, two grooves 13d defined by the locked member 13b are formed between the two recesses 13c of each vertical portion 13a2. The grooves 13d also open toward the inside in the left-right direction B. The support body 13a may be formed in a cylindrical shape.

As shown in FIG. 2, the locked member 13b has a plate-like portion 13b1 extending in the up-down direction C, and a clamping portion 13b2 connected to the outer end of the plate-like portion 13b1 in the left-right direction B. The clamping portion 13b2 is configured to be able to clamp the center of the vertical portion 13a2 in the up-down direction C from the front-rear direction A. The plate-like portion 13b1 is disposed in front of the vertical portion 13a2 so that the two recesses 13c and the two grooves 13d can be defined by the vertical portion 13a2. In this embodiment, the locked member 13b is made of synthetic resin, but may be made of metal.

Such a frame body 11 is formed symmetrically with respect to a center line in the up-down direction C that passes through the center in the left-right direction B.

As shown in FIG. 3, the lid body 21 has a lid portion 22 and a locking member 23 made of synthetic resin that can be locked with the locked member 13b. The lid portion 22 is composed of a plate-shaped member having a rectangular planar shape that is long in the left-right direction B when viewed from the front. The lid portion 22 in this embodiment is also made of foamed resin like the frame portion 12 and the support body 13a, and has thermal insulation properties. The lid portion 22 may be made of other synthetic resins that have thermal insulation properties. Two recesses 22a1 and 22a2 are formed on the front surface 22a of the lid portion 22. The recess 22a2 is located slightly to the left of the center of the lid portion 22 in the left-right direction B, and has a long hole shape that is long in the up-down direction C.

As shown in FIG. 3(a), the recess 22a1 is located at the left end of the lid 22. The recess 22a1 is formed from the front surface 22a of the lid 22 through the left side surface 22c to the rear surface 22b, and is a portion for attaching the locking member 23.

As shown in FIG. 3(a), the right side surface 22d of the lid portion 22 has two projections 27 that protrude to the right. These projections 27 are spaced apart from each other in the vertical direction C. The two projections 27 are formed to a size that allows them to be inserted into one of the two recesses 13c in the horizontal direction B when the lid body 21 is fitted into the opening 12a of the frame body 11.

As shown in FIG. 3(b), a recess 22b1 is formed on the rear surface 22b of the lid 22. This allows the lid 22 to be lightweight. In addition, a step 30 is formed around the entire periphery of the rear portion of the lid 22. The vertical step surface 31 formed by this step 30 is a surface that abuts against the annular surface 12c on the inside of the support portion 13 on the front surface of the frame 12 when the lid 21 is fitted and attached to the opening 12a of the frame 11. In other words, when the lid 21 is attached to the frame 11, the step surface 31 abuts against the annular surface 12c, and the opening 12 of the frame 11 is sealed by the lid 21.

As shown in FIG. 3, the locking member 23 has a clamping portion 41 that clamps the end of the lid portion 22, and an operating portion 42 that is integrally formed with the clamping portion 41. The clamping portion 41 is made of a plate-like member that forms an approximately U-shape. The operating portion 42 has a first portion 43 that is approximately semicircular when viewed from the front, and a pair of second portions 44 that are arranged at a position that clamps the clamping portion 41 in the up-down direction C and connect the first portion 43 to the rear portion of the clamping portion 41. The first portion 43 is made of a plate-like member with a long hole 43a that penetrates in the front-rear direction A. The second portion 44 is made of a plate-like member that extends leftward from the left end of the first portion 43 and then bends backward and bends along the shape of the step portion 30. In addition, the pair of second portions 44 are formed with locking projections 46 as shown in FIG. 3(b). The locking projections 46 have an inclined surface 46a that inclines so as to move forward and away from the second portion 44.

As shown in FIG. 3, the locking member 23 is attached so that the left end of the lid 22 is clamped in the front-rear direction A by the clamping portion 41. The front portion of the operating portion 42 is separated from the clamping portion 41 via the slit 45. As a result, the first portion 43 of the operating portion 42 of the locking member 23 attached to the lid 22 can move in the left-right direction B due to the elastic deformation of the second portion 44. Therefore, when a user inserts his/her finger into the long hole 43a and the recess 22a2 of the first portion 43 and moves the first portion 43 in a direction approaching the recess 22a2, the second portion 44 is elastically deformed and the first portion 43 approaches the recess 22a2. In other words, the first portion 43 moves to the right. At this time, the front portion of the second portion 44 also moves to the right, so that the locking protrusion 46 inserted into the groove portion 13d and engaged with the locked member 13b comes out of the groove portion 13d and is released from the locking. Thus, when the locking projection 46 and the locked member 13b are released, the lid 21 can be removed forward from the frame 11. On the other hand, when fitting and attaching the lid 21 to the opening 12a of the frame 11, the two projections 27 are inserted into the two recesses 13c on either the left or right side. Then, when the lid 21 is pushed into the opening 12a, the inclined surface 46a of the locking projection 46 engages with the locked member 13b on the other side, moving the operating part 42 in the left-right direction B, and the locking projection 46 is inserted into the groove 13d and locked to the locked member 13. Thus, the lid 21 is attached in a locked state to the frame 11. At this time, the lid 21 is supported by the support part 13 of the frame 11.

By providing such a locking member 23 on the lid body 21, it is possible to easily lock the lid body 21 to the frame body 11 by simply fitting the lid portion 22 into the opening 12a.

In this embodiment, the frame body 11 is formed symmetrically with respect to a center line that passes through the center of the left-right direction B and is parallel to the up-down direction C. Therefore, the lid body 21 can be attached to the frame body 11 regardless of whether the locking member 23 is positioned on the left or right side.

Next, the installation method for the foundation inspection hatch 1 will be explained below with reference to Figures 4 and 5.

To install the foundation inspection hatch 1 integrally with the foundation, first, as shown in FIG. 4(a), one of the forms 81 for forming the foundation is installed. A release agent is applied to the inner surfaces 81a, 82a of the form 81 and the form 82 described below. After this, the front surface of the foundation inspection hatch 1 is placed in a desired position (in this embodiment, the position of a part of the foundation that defines the space below the bathroom using the unit bath) with the form 81 abutting the inner surface 81a of the form 81. Then, the other form 82 is installed so that the foundation inspection hatch 1 is sandwiched between the form 81 and the other form 82 in the front-to-rear direction A. At this time, both form 81, 82 are clamped with clamping metal fittings (not shown) so that the form 82 approaches the form 81. As a result, the foundation inspection hatch 1 is placed in the form 81, 82 with the convex rib portion 14 pressed against the inner surface 82a of the form 82 (placement process). For this reason, as shown in FIG. 4(b), the convex rib portion 14 of the foundation inspection hatch 1 is pressed and crushed by the inner surface 82a of the formwork 82. By crushing the convex rib portion 14 by the inner surface 82a in this way, it is less likely that gaps will be created through which the slag of the concrete 83 can seep in from around the frame body 11 to the inside of the convex rib portion 14. Although the convex rib portion 14 is not formed at the lower end of the rear surface 12b, the slag of the concrete 83 almost never seeps into the opening 12a from the lower end side.

Next, as shown in FIG. 4(b), concrete 83 is poured into the formwork 81, 82 (pouring process). In this embodiment, the top surface of the foundation inspection hatch 1 is flush with the top surface of the foundation, so concrete 83 is not poured onto the top surface of the foundation inspection hatch 1.

After pouring the concrete 83, when a predetermined time has elapsed, the concrete 83 hardens and forms the foundation 101, as shown in FIG. 5. Then, the formwork 81, 82 is removed. This completes the installation method for the foundation inspection hatch 1, and the foundation structure 100 is formed with the foundation inspection hatch 1 integrated into the foundation 101.

As described above, according to the foundation inspection hatch 1 in this embodiment, when the foundation inspection hatch 1 is installed in the formwork 81, 82 for pouring the concrete 83, the convex strip portion 14 is pressed by the inner surface 82a of the formwork 82 and can be deformed. Therefore, a gap through which the slag of the concrete 83 penetrates from the periphery of the frame body 11 to the inside of the convex strip portion 14 is unlikely to occur between the frame body 11 and the inner surface 82a of the formwork 82. Therefore, it is possible to reduce the adhesion of the slag to the inside of the convex strip portion 14 of the frame body 11 and dirt. It is also possible to reduce the adhesion of the release agent attached to the inner surface 82a of the formwork 82 to the inside of the convex strip portion 14 of the frame body 11 and dirt. In this way, even if the foundation inspection hatch 1 is not covered with masking tape or the like, it is possible to reduce the adhesion of the release agent or the slag of the concrete 83 to the inside of the convex strip portion 14 of the foundation inspection hatch 1 and dirt. As a result, since masking tape is not required, the work of removing the masking tape is eliminated, and the removed masking tape does not need to be disposed of, resulting in a foundation inspection hatch 1 with improved appearance after installation. In addition, since concrete 83 sludge is less likely to seep into the opening 12a, it is possible to prevent the lid 21 from becoming difficult to attach and remove from the frame 11.

In addition, the frame portion 12 of the frame body 11 is made of foamed resin, and the convex rib portion 14 and the frame portion are integrated. This makes it difficult for the convex rib portion 14 to fall off the frame body 11. It also eliminates the need to produce the convex rib portion 14 and the frame body 11 (frame portion 12) in separate processes, making it possible to reduce manufacturing costs. In addition, because the convex rib portion 14 is made of foamed resin, it is easily crushed by the inner surface 82a of the formwork 82. This eliminates the need to remove the convex rib portion 14 to make it flush with the side (rear) of the foundation 101.

In addition, because the ridges 14 are semicircular in cross section, they can be easily crushed by the inner surface 82a of the formwork 82. This makes it even less likely that gaps will form between the frame 11 and the inner surface 82a of the formwork 82, allowing the slag of concrete 83 to seep in from around the frame 11 to the inside of the ridges 14. As a modified example, the cross-sectional shape (horizontal cross-sectional shape) of the ridges 14 may be triangular, tapering away from the frame 11. This also provides the same effect as described above.

In addition, according to the installation method of the foundation inspection hatch 1, in the placement process, the convex strip portion 14 is pressed and deformed by the inner surface 82a of the formwork 82. Therefore, between the frame body 11 and the inner surface 82a of the formwork 82, a gap through which the slag of the concrete 83 penetrates from the periphery of the frame body 11 to the inside of the convex strip portion 14 is unlikely to occur. Therefore, even if concrete is poured into the formwork 81, 82 in the pouring process, it is possible to reduce the adhesion of the slag to the inside of the convex strip portion 14 of the frame body 11 and the dirt. It is also possible to reduce the adhesion of the release agent attached to the inner surface 82a of the formwork 82 to the inside of the convex strip portion 14 of the frame body 11 and the dirt. In this way, even if the foundation inspection hatch 1 is not covered with masking tape or the like, it is possible to reduce the adhesion of the release agent and the slag of the concrete 83 to the inside of the convex strip portion 14 of the foundation inspection hatch 1 and the dirt. As a result, since masking tape is not required, the work of removing the masking tape is eliminated, and the removed masking tape does not need to be disposed of, resulting in a foundation inspection hatch 1 with improved appearance after installation. In addition, since concrete 83 sludge is less likely to seep into the opening 12a, it is possible to prevent the lid 21 from becoming difficult to attach and remove from the frame 11.

Next, a foundation inspection hatch 201 according to a second embodiment of the present invention will be described below with reference to Figures 6 and 7. The foundation inspection hatch 201 in this embodiment is a built-in type foundation inspection hatch that is installed integrally with the foundation when the foundation is formed.

As shown in Figure 6, the foundation inspection hatch 201 in this embodiment has a frame body 211 and the same cover body 21 as in the first embodiment. The foundation inspection hatch 201 in the second embodiment has a frame body 211 that is different from the frame body 11 in the first embodiment, but otherwise has a similar configuration. For this reason, the same components as in the first embodiment described above are indicated with the same reference numerals and will not be described. Note that Figure 6 also shows the front-to-back direction A, left-to-right direction B, and up-to-down direction C when the foundation inspection hatch 201 is viewed from the front, and these directions will be reflected in the other figures and will be described below.

As shown in FIG. 7(a), the frame body 211 has a frame portion 212 and a support portion 213 that supports the cover body 21. The frame portion 212 has a rectangular cylindrical shape and defines an opening 212a that opens in the front-rear direction A. As shown in FIG. 7(b), the frame portion 212 has a convex rib portion 214 that protrudes rearward from the rear surface (back surface) 212b and extends along the periphery of the opening 212a. The convex rib portion 214 is formed integrally with the frame portion 212. The convex rib portion 214 also has an inverted U-shape. That is, the convex rib portion 214 has a horizontal portion 214a that extends in the left-right direction B formed at the upper end of the frame portion 212, and a pair of vertical portions 214b that extend in the up-down direction C formed at both left and right ends of the frame portion 12. The horizontal portion 214a is formed over the entire length in the left-right direction B at the upper end of the rear surface 212b. The pair of vertical portions 214b are formed on both the left and right ends of the rear surface 212b over the entire length in the up-down direction C. In this embodiment, the cross-sectional shape of the convex rib portion 214 is also semicircular, but it may be triangular and tapered as it moves away from the frame body 211.

The support portion 213 has a support portion main body 213a formed integrally with the frame portion 212, and two engaged members 13b similar to those in the first embodiment described above. The frame portion 212 and the support portion main body 213a constituting the frame body 211 are integrally molded. The frame portion 212 and the support portion main body 213a are made of soft resin. In this embodiment, they are made of foamed resin similar to the first embodiment, and have heat insulating properties. The convex rib portion 214 is also made of the same material (foamed resin: soft resin). The frame portion 212, the support portion main body 213a, and the convex rib portion 214 may also be made of other soft resins similar to the first embodiment.

As shown in FIG. 7(a), the support body 213a is integrally formed on the front surface of the frame 212 and has a rectangular tubular shape. That is, the support body 13a has a pair of horizontal parts 213a1, 213a2 extending in the left-right direction B formed on both upper and lower ends of the frame 212, and a pair of vertical parts 213a3 extending in the up-down direction C formed on both left and right ends of the frame 212. The upper horizontal part 213a1 is wider in the up-down direction C than the lower horizontal part 213a2. Each vertical part 213a3 has two recesses 13c and two grooves 13d formed therein, similar to the vertical part 13a2 of the first embodiment described above. In addition, the support body 213a is positioned so that when the lid 21 is fitted into the opening 212a of the frame 211 and attached, the annular surface 212e that abuts against the step surface 31 is formed on the inside of the support body 213a on the front surface of the frame 212.

This frame body 211 is also formed symmetrically with respect to the center line in the up-down direction C that passes through the center in the left-right direction B.

In addition, a punching plate 212c is integrally formed at the rear end of the frame portion 212 of the frame body 211 via a thin portion 212d so as to block the rear of the opening 12a1. After the foundation is formed, the punching plate 212c can be cut off (punched out) by the user at the thin portion 212d. Since the punching plate 212c is formed, the shape of the frame body 211 is maintained, and it is possible to prevent distortion, particularly in the rear portion of the frame body 211, caused by the concrete poured during the foundation formation. Furthermore, since the punching plate 212c blocks the rear portion of the opening 212a1, it is possible to prevent the concrete during the foundation formation from flowing into the frame body 211. In addition, since the punching plate 212c is connected to the frame body 211 via the thin portion 212d, it can be easily punched out after the foundation is completed.

Next, the installation method for the foundation inspection hatch 201 will be explained below with reference to Figures 8 and 9.

To install the foundation inspection hatch 201 integrally with the foundation, first, as shown in FIG. 8(a), one of the forms 281 for forming the foundation is installed. A release agent is applied to the inner surfaces 281a, 282a of the form 281 and the form 282 described below. After this, the front surface of the foundation inspection hatch 201 is placed in contact with the inner surface 281a of the form 281 at the desired position (in this embodiment, the position of a part of the foundation that defines the space below the bathroom using the unit bath). Then, the other form 282 is installed so that the foundation inspection hatch 201 is sandwiched between the one form 281 in the front-rear direction A. At this time, both form frames 281, 282 are clamped with clamping metal fittings (not shown) so that the form 282 approaches the form 281. As a result, the foundation inspection hatch 201 is placed in the formwork 281, 282 with the convex rib portion 214 pressed against the inner surface 282a of the formwork 282 (placement process). Therefore, as shown in FIG. 8(b), the convex rib portion 214 of the foundation inspection hatch 201 is pressed against the inner surface 282a of the formwork 282 and crushed. By crushing the convex rib portion 214 against the inner surface 282a in this way, it is difficult for gaps to be formed through which the slag of the concrete 283 can penetrate from the periphery of the frame body 211 to the inside of the convex rib portion 214. Although the convex rib portion 214 is not formed at the lower end of the rear surface 212b, the slag of the concrete 283 rarely penetrates into the opening 212a from the lower end side.

Next, as shown in FIG. 8(b), concrete 283 is poured into the formwork 281, 282 (pouring process). In this embodiment, the top surface of the foundation inspection hatch 201 is lower than the top surface of the foundation in order to embed the foundation inspection hatch 201 in the foundation, so concrete 283 is also poured onto the top surface of the foundation inspection hatch 1.

After pouring the concrete 283, when a predetermined time has elapsed, the concrete 283 hardens and the foundation 202 is formed, as shown in FIG. 9. Then, a demolding operation is performed to remove the formwork 281, 282. This completes the installation method for the foundation inspection hatch 201, and the foundation structure 200 is formed in which the foundation inspection hatch 201 is integrated with the foundation 202.

As described above, according to the foundation inspection hatch 201 and its installation method in this embodiment, as in the first embodiment, the convex strip portion 214 is pressed by the inner surface 282a of the formwork 282 and can be deformed. Therefore, between the frame body 211 and the inner surface 282a of the formwork 282, a gap through which the slag of the concrete 283 penetrates from the periphery of the frame body 211 to the inside of the convex strip portion 214 is unlikely to occur. Therefore, even if the concrete 283 is poured into the formwork 281, 282 by the pouring process, it is possible to reduce the adhesion of the slag to the inside of the convex strip portion 214 of the frame body 211 and the dirt. It is also possible to reduce the adhesion of the release agent attached to the inner surface 282a of the formwork 282 to the inside of the convex strip portion 214 of the frame body 211 and the dirt. In this way, even if the foundation inspection hatch 201 is not covered with masking tape or the like, it is possible to reduce the amount of dirt caused by release agent or concrete 283 slag adhering to the inside of the convex strip 214 of the foundation inspection hatch 201. As a result, since masking tape is not used, the work of removing the masking tape is eliminated, and furthermore, it is possible to obtain a foundation inspection hatch 201 with improved appearance after installation, without the need to dispose of the removed masking tape. In addition, since it is difficult for concrete 283 slag to penetrate into the opening 212a, it is possible to prevent the lid body 21 from becoming difficult to attach and remove from the frame body 211. Note that the same effect can be obtained in a configuration similar to that of the first embodiment.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible within the scope of the claims. For example, the convex rib portion 14, 214 in each of the above-mentioned embodiments is formed only on the rear surface (back surface) 12b, 212b of the frame body 11, 211, but a convex rib portion extending along the periphery of the opening 12a, 212a may be formed on the front surface (front surface) of the frame body 11, 211. Note that the convex rib portion may be formed on at least one of the front and rear surfaces of the frame body. In this way, it is possible to reduce the adhesion of release agent or sludge of concrete 83, 283 to the inside of the convex rib portion 14, 214 of the foundation inspection hatch 1, 201 and to obtain the same effect as described above.

In the first embodiment, two protruding ridges 14 were formed on the rear surface 12b of the frame body 11, one on each side of the opening 12a, but one or three or more may be formed. At least one of the upper and lower ends of the rear surface 12b may have a protruding ridge extending along the left-right direction B. In the second embodiment, the protruding ridges 214 may have only one or two of the horizontal portion 214a and the pair of vertical portions 214b. The protruding ridges 214 may further have a horizontal portion extending in the left-right direction B formed on the lower end of the frame portion 212.

The convex rib portion 14, 214 in each embodiment may be formed separately from the frame body 11, 211. In other words, the convex rib portion 14, 214 may be produced separately from the frame body 11, 211, and the convex rib portion 14, 214 may be provided on the frame body 11, 211. In this case as well, the same effect as described above can be obtained.

Also, for example, if the frame body 11 and the lid body 21 are formed from a foamable resin and the lid body 21 is fitted and held in place in the opening 12a of the frame body 11, it is not necessary to provide the locked member 13b and the locking member 23.

1,201 Foundation inspection port 11,211 Frame 12a, 212a Opening 12b, 212b Rear surface (back surface)
14, 214 Convex portion 21 Lid body 81, 82, 281, 282 Formwork 81a, 82a, 281a, 282a Inner surface 83, 283 Concrete 101 Foundation

Claims (4)

A foundation inspection hatch that is installed integrally with a foundation when concrete is poured to form the foundation,
A frame having an opening;
A lid body that can be fitted into the opening,
At least one of the front surface and the back surface of the frame body is provided with a protruding portion extending along the periphery of the opening ,
A foundation inspection hatch characterized in that the frame body and the convex strip portion are made of foamed resin, and the convex strip portion and the frame body are integrated . A foundation inspection hatch as described in claim 1, characterized in that the convex strip portion is provided along the outer peripheral edge portion of the front and/or back surface of the frame body . The foundation inspection hatch according to claim 1 or 2, characterized in that the convex rib portion is semicircular or triangular in cross section. a placement process for placing the foundation inspection hatch, which comprises a foamed resin frame having an opening and a lid that can be fitted into the opening, the frame having a foamed resin protruding portion that extends along the periphery of the opening and is integral with the frame on at least one of the front and back surfaces of the frame, within a formwork by pressing the protruding portion against the inner surface of the formwork;
A method for installing a foundation inspection hatch, comprising a pouring step of pouring concrete into the formwork.

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