Bathroom entrance substructure and method for installing bottom frame in this substructure

Abstract

To prevent a lower frame from floating up in a process of hardening silicone interposed between a frame and the lower frame at a bathroom entrance, and to eliminate a need for curing work such as placing a heavy object on the lower frame to prevent the floating up.SOLUTION: A bathroom entrance substructure 3 comprises a frame 10 arranged along a side edge of a bathroom floor 1a, and a lower frame 20 spanning between an adjacent room floor 2a and the frame 10. Silicone 17 is arranged at a bottom of an insertion groove 12 of the frame 10. An insertion protrusion 24 of the lower frame 20 is inserted into the insertion groove 12. An engaging piece 60 is fixed to the lower frame 20. A step 15 (engagement receiving portion) is formed on the frame 10. An engaging claw portion 63 at a tip of the engaging piece 60 engages with the step 15, preventing the lower frame 20 from lifting up during a hardening process of the silicone 17.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a lower structure for a bathroom entrance that is opened and closed by a door, and a method for installing a lower frame in this lower structure. [Background technology]

[0002] As disclosed in Patent Document 1, the lower structure of a bathroom entrance includes a frame and a lower frame that are placed along the side edges of the bathroom flooring. The lower frame spans between the frame and the floor of an adjacent room, such as a dressing room adjacent to the bathroom.

[0003] The gap between the frame and the lower frame must be watertight. To achieve this, the frame has an insertion groove extending along its length, and the lower frame has an insertion protrusion extending along its length on the bathroom-side edge. A watertight material such as silicone is placed at the bottom of this insertion groove, and the insertion protrusion is inserted into the insertion groove to ensure watertightness between the frame and the lower frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-55269 Summary of the Invention [Problem to be solved by the invention]

[0005] When the watertight material hardens while the insertion convex part of the sill is inserted into the insertion concave groove of the frame, the watertight material exerts force on the sill, causing it to lift up, which can compromise watertightness and interfere with opening and closing the door. The amount of lift increases the wider the bathroom entrance. Therefore, while the watertight material hardens, a heavy object is placed on the sill to press down from above, preventing it from lifting up, but this heavy object gets in the way of installation. [Means for solving the problem]

[0006] To solve the above problem, a bathroom entrance lower structure is provided, which includes a frame arranged along the side edge of the bathroom floor, and a lower frame that is bridged between the floor of the adjacent room adjacent to the bathroom and the frame, the frame having an insertion groove formed along its longitudinal direction, and the side edge of the lower frame on the bathroom side has an insertion protrusion that is inserted into the insertion groove formed along the longitudinal direction of the lower frame, and a watertight material is interposed between the bottom of the insertion groove and the insertion protrusion. An engagement receiving portion is provided on the adjacent room side of the frame, and an engagement claw portion is provided on the lower frame, and the engagement between the engagement claw portion and the engagement receiving portion regulates upward displacement of the lower frame. With this configuration, the engagement of the engaging claws and the engaging receivers can restrict the upward displacement of the lower frame, ensuring watertightness and preventing problems with opening and closing the door. In addition, there is no need for protective work such as placing heavy objects on the lower frame, improving workability.

[0007] Preferably, an engagement piece that is separate from the frame and the lower frame is provided, and the engagement piece has a fixing portion that is fixed to the lower frame and the engagement claw portion. With this configuration, the use of the engagement piece ensures reliable engagement between the engagement claw and the engagement receiving part. In addition, the engagement piece is fixed to the lower frame, eliminating the need for fixing to the frame under the floor, making the fixing work easier.

[0008] Preferably, the engaging piece further has a hanging portion hanging down from the fixing portion, and the engaging claw portion is formed at a lower end of the hanging portion. According to this configuration, by selecting the dimensions of the hanging portion in accordance with the position of the engagement receiving portion of the frame, it is possible to optimize the engagement between the engagement claw portion and the engagement receiving portion.

[0009] Preferably, the lower frame has a press-fit groove formed therein that extends in the longitudinal direction of the lower frame and opens toward the frame, and the fixing portion protrudes from the upper end of the hanging portion to the side opposite the frame and is pressed into the press-fit groove. According to this configuration, the fixing portion of the engaging piece can be easily fixed to the lower frame without using fixing means such as screws.

[0010] Preferably, a first protrusion is formed at the opening end of the press-fit groove, a second protrusion is formed on the fixing portion of the engaging piece, and the fixing portion is pressed into the press-fit groove so that the second protrusion overcomes the first protrusion. According to this configuration, the press-fitting structure can be simplified.

[0011] The fixing portion of the engaging piece may be fixed to the lower surface of the lower frame. The engagement receiving portion may be a step formed in a wall facing away from the frame, or an upper end of a hole formed in the wall.

[0012] In another embodiment, an engagement piece that is separate from the frame and the lower frame is provided, and the engagement piece has a fixed portion that is fixed to the wall portion of the frame facing the adjacent room, and an engagement receiving portion that protrudes from the fixed portion toward the adjacent room, and the lower frame has a protruding end portion that protrudes toward the frame, and this protruding end portion is provided as the engagement claw portion.

[0013] In yet another embodiment, first and second engaging pieces that are separate from the frame and the lower frame are provided, the first engaging piece having a fixed portion fixed to the underside of the lower frame and the engaging claw portion, and the second engaging piece having a fixed portion fixed to the wall of the frame facing the adjacent room and the engaging receiving portion.

[0014] Another aspect of the present invention is a bathroom with a frame arranged along the side edge of the bathroom floor, and a lower frame that spans between the floor of the adjacent room adjacent to the bathroom and the frame, The frame has an insertion groove formed along its longitudinal direction, and the bathroom side edge of the lower frame has an insertion protrusion that is inserted into the insertion groove, and a watertight material is interposed between the bottom of the insertion groove and the insertion protrusion. An engagement receiving portion is provided on the adjacent room side of the frame, and an engagement claw portion is provided on the lower frame, The method is characterized by comprising a watertight material installation process for installing the watertight material in the insertion groove; a lower frame installation process for inserting the insertion convex portion of the lower frame into the insertion groove of the frame and engaging the engaging claw portion with the engaging receiving portion; and a watertight material hardening process for hardening the watertight material and regulating upward displacement of the lower frame during this hardening process by engagement of the engaging claw portion with the engaging receiving portion.

[0015] Preferably, the method further includes an engaging piece that is separate from the frame and the lower frame, the engaging piece having a fixing portion and the engaging claw portion, and prior to the lower frame installation process, a step of assembling a lower frame assembly by fixing the fixing portion of the engaging piece to the lower frame, wherein in the lower frame installation process, the insertion convex portion of the lower frame assembly is inserted into the insertion groove of the frame, and the engaging claw portion of the lower frame assembly is engaged with the engagement receiving portion of the frame. [Effects of the Invention]

[0016] According to the present invention, the upward displacement of the lower frame can be regulated during the hardening process of the watertight material without the need for curing work such as placing a heavy object on it. [Brief explanation of the drawings]

[0017] [Figure 1] A cross-sectional view showing the lower structure of the bathroom entrance / exit in the first embodiment of the present invention. [Figure 2] 3A and 3B show an engaging piece used in the first embodiment, in which FIG. 3A is a side view and FIG. 3B is a perspective view seen from below. [Figure 3]A cross-sectional view showing a lower frame assembly assembled by pressing the fixing portion of the engagement piece into the press-fit groove of the lower frame. [Figure 4] 10 is a cross-sectional view showing a state in which a watertight material is placed in an insertion groove of a frame. FIG. [Figure 5] A cross-sectional view showing the state in which the insertion convex portion of the lower frame of the lower frame assembly is inserted into the insertion groove of the frame and the engagement claw portion of the lower frame assembly is engaged with the engagement receiving portion of the frame. [Figure 6] 5A is a view showing the lower structure of the bathroom entrance according to the second embodiment of the present invention, and FIG. 5B is an enlarged side view of the engaging piece. [Figure 7] 5A is a view equivalent to FIG. 5 showing the lower structure of the bathroom entrance according to the third embodiment of the present invention, and FIG. 5B is an enlarged cross-sectional view of an engaging piece. [Figure 8] 5 and shows the lower structure of the bathroom entrance according to a fourth embodiment of the present invention. [Figure 9] 5 and shows the lower structure of the bathroom entrance according to the fifth embodiment of the present invention. FIG. [Figure 10] 5 and shows the lower structure of the bathroom entrance according to the sixth embodiment of the present invention. FIG. [Figure 11] 5 and shows the lower structure of the bathroom entrance according to the seventh embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. <First embodiment (FIGS. 1 to 5)> Figure 1 shows the substructure 3 of the bathroom entrance, which is placed between the bathroom floor pan (floor material) 1 and the dressing room (adjacent room) floor material 2. In this embodiment, the difference in level between the bathroom floor surface 1a and the dressing room floor surface 2a is small, making it barrier-free.

[0019] The main components of the lower structure 3 are a frame 10 (drain frame) that is positioned along the side edge of the bathroom floor pan 1 and supports the bathroom floor pan, a lower frame 20 that spans between this frame 10 and the dressing room floor surface 2a, and a cover member 30 that covers this lower frame 20. The frame 10 is supported by multiple pillars (not shown).

[0020] The top surface of the frame 10 is formed with a shallow receiving groove 11 on the bathroom side and an insertion groove 12 on the dressing room side of the receiving groove 11, running along the longitudinal direction of the frame 10. A watertight material 13 is placed in the receiving groove 11. This watertight material 13 ensures watertightness between the receiving groove 11 and the flange 1b of the bathroom floor pan 1 that fits over the receiving groove 11. The role of the insertion groove 12 will be described later.

[0021] The wall of the frame 10 facing the changing room has a vertical upper wall portion 14a and a vertical lower wall portion 14b, and a step 15 (engagement receiving portion) is formed at the boundary between them.

[0022] The lower frame 20 has an attachment portion 21 that is hooked onto the edge of the dressing room floor 2a and fixed to the dressing room floor material 2 with screws 40; an upper wall 23 that connects to the bathroom-side leading edge of the attachment portion 21 via a step 22 and gently slopes toward the bathroom; an insertion protrusion 24 with a rectangular cross section that protrudes downward and is formed on the bathroom-side leading edge of the upper wall 23; a substantially horizontal lower wall 25; and multiple vertical walls (only the bathroom-side vertical wall is labeled 26) that connect the upper wall 23 and the lower wall 25. The width of the lower wall 25 is smaller than that of the upper wall 23, and a press-fit groove 27 is defined by the bathroom-side leading edge of the lower wall 25, the middle portion of the upper wall 23, and the vertical wall 26. The press-fit groove 27 opens toward the frame 10. A protrusion 27a (first protrusion) is formed at the leading edge of the lower wall 25, i.e., the open end of the press-fit groove 27. The role of the press-fit groove 27 will be described later.

[0023] Butyl or acrylic double-sided adhesive waterproof tape 16 (watertight material) is attached to the side of the insertion groove 12 of the frame 10, and silicone 17 (watertight material) is placed at the bottom of the insertion groove 12. The silicone 17 also has an adhesive function. Instead of the silicone 17, polyurethane or acrylic may be used. The insertion protrusion 24 of the lower frame 20 is inserted into the insertion groove 12 via the double-sided waterproof adhesive tape 16 and silicone 17, thereby ensuring watertightness between the frame 10 and the lower frame 20.

[0024] The cover member 30 has a known structure and will only be briefly described. The cover member 30 covers the upper wall 23 of the lower frame 20 and extends down to the bathroom floor 1a. The cover member 30 is attached to the lower frame 20 by engaging its side edge on the dressing room side with the step 22 of the lower frame 20 and its middle portion with a cover support 50 fixed to the upper wall 23 of the lower frame 20 with screws 55.

[0025] A plurality of rails 31 are formed on the upper surface of the cover member 30. The bathroom entrance is opened and closed by a sliding door (not shown) running along these rails 31. Sealing material 32 is arranged between the rails 31, sliding against the side of the lower end of the door. A sealant 35 is attached to the portion of the cover member 30 that extends into the bathroom. This sealant 35 comes into contact with the bathroom floor surface 1a, thereby achieving watertightness between the cover member 30 and the bathroom floor surface 1a.

[0026] The lower structure 30 of the bathroom doorway of the present invention further incorporates an engagement piece 60. This engagement piece 60 is made of a resin such as POM, and serves to prevent the lower frame 20 from lifting up after the lower frame 20 is installed on the frame 10. This will be described in detail below.

[0027] 2, engaging piece 60 has a fixed portion 61, a plate-shaped hanging portion 62 hanging down from fixed portion 61, and an engaging claw portion 63 protruding to one side (frame 10 side) from the lower end of hanging portion 62. Fixed portion 61 protrudes to the other side (changing room side) from the upper end of hanging portion 62. A protrusion 61a (second protrusion) having a mountain-shaped cross section is formed on the underside of fixed portion 61.

[0028] 3, the fixing portion 61 of the engaging piece 60 is hammered into the press-fit groove 27 of the engaging piece 60 in the direction of the arrow. At this time, the protrusion 62a of the fixing portion 61 overcomes the protrusion 27a of the press-fit groove 27, so that the fixing portion 61 is press-fitted into the press-fit groove 27, and the engaging piece 60 is firmly connected to the lower frame 20. In the following explanation, the lower frame 20 with this engaging piece 60 attached will be referred to as the lower frame assembly A1.

[0029] 4, a double-sided waterproof tape 16 and silicone 17 are set in the insertion groove 12 of the frame 10. The double-sided waterproof tape 16 and silicone 17 extend over the entire length of the frame 10.

[0030] As shown in Figure 5, by inserting part of the insertion protrusion 24 of the lower frame 20 of the lower frame assembly A1 into the insertion groove 12 of the frame 10 and rotating the lower frame assembly A1 around the insertion protrusion 24 as shown by the arrow, the lower frame 20 becomes approximately horizontal, and its mounting portion 21 reaches the changing room side floor surface 2a, and the engaging claw portion 63 of the engaging piece 60 fits under the step 15 of the frame 10 with a small clearance. The mounting portion 21 of the lower frame 20 is attached to the changing room floor material 2 with screws 40.

[0031] Once the installation process for the lower frame assembly A1 is complete, the silicone 17 is allowed to harden. During this hardening process, the lower frame 20 tends to lift up due to the repulsive force of the silicone 17, but the engaging claws 63 of the engaging pieces 60 come into contact with (engage with) the underside of the step 15 of the frame 10, preventing the lower frame 20 from lifting up (upward displacement). As a result, good watertightness is maintained and problems such as interference with opening and closing the door are prevented. Furthermore, because the engaging pieces 60 prevent the lower frame 20 from lifting up, there is no need for protective work such as placing a heavy object on the lower frame 20 and constantly holding it down from above while the silicone 17 hardens, which also avoids problems such as heavy objects interfering with construction.

[0032] Since the engaging piece 60 is fixed to the lower frame 20 in advance, there is no need for work under the floor to fix the engaging piece 60 to the frame 10, which improves workability.

[0033] Next, another embodiment of the present invention will be described. In the following embodiment, the same reference numerals or names are used in the drawings to designate components corresponding to those in the preceding embodiment, and detailed descriptions thereof will be omitted. Second Embodiment As shown in Figure 6, the arrangement of the fixed portion 161, hanging portion 162, and engaging claw portion 163 of the engaging piece 160 of the second embodiment is the same as that of the engaging piece 60 of the first embodiment. A plurality of vertical grooves 162x are formed on the side of the hanging portion 162 facing the changing room, and recesses 161x continuous with these vertical grooves 162x are formed in the fixed portion 161. Protrusions 161a are formed in the fixed portion 161 at locations where recesses 161x are not formed. The engaging claw portion 163 is thinner than the engaging claw portion 63 of the first embodiment. The engaging piece 160 of the second embodiment can use less material than the engaging piece 60 of the first embodiment.

[0034] In the second embodiment, as in the first embodiment, the fixing portion 161 of the engaging piece 160 is pressed into the press-fit groove 27 of the lower frame 20 to assemble the lower frame assembly A2, and the insertion convex portion 24 of this lower frame assembly A2 is inserted into the insertion groove 12 of the frame 10 in which the double-sided adhesive waterproof tape 16 and silicone 17 are set, and the engaging claw portion 163 engages with the step 15 of the frame 10. The action in the process of curing the silicone 17 is the same as in the first embodiment, so a description thereof will be omitted.

[0035] Third Embodiment 7 has a fixed portion 261, a hanging portion 262, and an engaging claw portion 263, similar to the first and second embodiments, but the hanging portion 262 is shorter than in the first and second embodiments. In this embodiment, the upper end 18a of a hole 18 formed in the upper wall portion 14a serves as the engaging receiving portion instead of the step 15 of the frame 10. A protrusion 261a is formed on the lower surface of the fixed portion 261.

[0036] In the third embodiment, as in the first and second embodiments, the fixing portion 261 of the engaging piece is pressed into the press-fit groove 27 of the lower frame 20 to assemble the lower frame assembly A3, and the insertion convex portion 24 of this lower frame assembly A3 is inserted into the insertion concave groove 12 of the frame 10 in which the double-sided adhesive waterproof tape 16 and silicone 17 are set, and the engaging claw portion 263 is inserted into the hole 18, and the lifting of the lower frame 20 during the hardening process of the silicone 17 is regulated by the engagement between the engaging claw portion 263 and the upper end 18a of the hole 18.

[0037] <Fourth embodiment> 8 has a horizontal, flat-plate-shaped fixing portion 361, a flat-plate-shaped hanging portion 362 hanging down from the tip edge of this fixing portion 361 on the frame 10 side, and an engaging claw portion 363 protruding from the lower end of this hanging portion 362 towards the frame 10. The fixing portion 361 comes into contact with the underside of the bottom wall 25 of the bottom frame 20 and is fixed to the bottom wall 25 with screws 70, thereby assembling the bottom frame assembly A4.

[0038] In the fourth embodiment, as in the first to third embodiments, the insertion convex portion 24 of the lower frame assembly A4 is inserted into the insertion concave groove 12 of the frame 10 in which the double-sided waterproof tape 16 and silicone 17 are set, and the engagement claw portion 363 engages with the step 15 of the frame 10. The hanging wall 362 contacts the upper wall portion 14a of the frame 10.

[0039] Fifth Embodiment 9 has a shape similar to that of the fourth embodiment, but is made of a thin metal plate or leaf spring rather than POM as in the first to fourth embodiments, and is thin-walled. As in the fourth embodiment, the flat fixing portion 461 of the fixing piece 460 is fixed to the bottom wall 25 of the bottom frame 20 with screws 70 to assemble the bottom frame assembly A5.

[0040] The lower frame assembly A5 may be assembled to the support frame 10 by rotating it as in the first to fourth embodiments, or it may be moved downward and assembled to the support frame 10 by utilizing the elastic deformation of the hanging portion 462, and the engaging claw portion 463 may be engaged with the step 15 of the support frame 10.

[0041] Sixth Embodiment 10 differs from the first to fifth embodiments in that the engaging piece 560 is fixed to the frame 10. More specifically, the engaging piece 560 has a fixing portion 561 having a vertical, flat plate shape, a positioning flange 562 that protrudes from the lower edge of the fixing portion 561 toward the frame 10, and an engaging receiving portion 563 that protrudes diagonally downward from the upper edge of the fixing portion 561 toward the changing room. With the positioning flange 562 abutting against the step 15 of the frame 10, the fixing portion 561 is abutted against the vertical upper wall portion 14a and fixed to the upper wall portion 14a with screws 80.

[0042] In the sixth embodiment, the protruding end 29 protruding from the vertical wall 26 of the bottom wall 25 of the bottom frame 20 toward the frame 10 is provided as an engaging claw. The insertion convex portion 24 of the bottom frame 20 is inserted into the insertion groove 12 of the frame 10 in which the double-sided waterproof tape 16 and silicone 17 are set, and the protruding end 29 of the bottom frame 20 overcomes the engagement receptacle 563 of the engagement piece 560 while elastically deforming the engagement receptacle 563 and engages with the engagement receptacle 563.

[0043] Seventh Embodiment 11, two engagement pieces 660, 670 are used. The first engagement piece 660 has a flat plate-shaped fixed portion 661 that is fixed to the bottom wall 25 of the bottom frame 20 with screws 70, a flat plate-shaped hanging portion 662 that hangs down from the fixed portion 661, and an engagement claw portion 663 formed at the lower end of the hanging portion 662. The bottom frame 20 and the first engagement piece 660 assemble a bottom frame assembly A7.

[0044] The second engaging piece 670 has a flat fixing portion 671 fixed to the vertical wall portion 14a of the frame 10 with screws 80, a positioning flange 672 formed at the lower end of the fixing portion 671 and abutting against the step 15 of the frame 10, an extension portion 673 extending from the upper end of the fixing flange 671 toward the changing room, and an engaging receiving portion 674 extending diagonally downward from the tip of the extension portion 673. As in the first to fourth embodiments, the insertion convex portion 24 of the lower frame assembly A7 is inserted into the insertion groove 12 of the frame 10 in which the double-sided waterproof adhesive tape 16 and silicone 17 are set, and the engaging claw portion 663 engages with the engaging receiving portion 674 of the second engaging piece 670.

[0045] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention. For example, although POM is used in the first to fourth, sixth and seventh embodiments, other resins or metals may also be used. Bathrooms include not only rooms equipped with bathtubs but also shower stalls. [Industrial Applicability]

[0046] The present invention can be applied to the lower structure of a bathroom entrance that is opened and closed by a door. [Explanation of symbols]

[0047] 3. Bathroom entrance / exit substructure 10 frames 12 Insertion groove 14a Vertical wall 15 Step (engagement receiving part) 17 Silicone (watertight material) 18a Upper end of hole (engagement receiving part) 20 Bottom frame 27 Press-fit groove 27a Protrusion (1st protrusion) 29 Projecting end (engaging claw) 60, 160, 260, 360, 460 engagement piece 61, 161, 261, 361, 461 Fixed part 61a, 161a, 261a protrusion (second protrusion) 62, 162, 262, 362, 462 hanging part 63, 163, 263, 363, 463 Engagement claw 560 Engagement piece 561 Fixed part 563 Engagement receiving part 660 First engaging piece 661 Fixed part 662 Drooping part 663 Engagement claw 670 Second engagement piece 671 Fixed part 674 Engagement receiving part A1, A2, A3, A4, A5, A7 Lower Frame Assembly

Claims

1. The bathroom is equipped with a frame arranged along the side edge of the bathroom floor, and a lower frame that spans between the floor of the adjacent room and the frame. The frame has an insertion groove formed along its longitudinal direction, and the bathroom side edge of the lower frame has an insertion protrusion formed along the longitudinal direction of the lower frame to be inserted into the insertion groove, and a watertight material is interposed between the bottom of the insertion groove and the insertion protrusion. The lower structure of a bathroom entrance / exit is characterized in that an engagement receiving portion is provided on the side of the frame facing the adjacent room, and an engagement claw portion is provided on the lower frame, and the engagement of the engagement claw portion with the engagement receiving portion restricts upward displacement of the lower frame.

2. The lower structure of a bathroom entrance / exit as described in claim 1, characterized in that an engaging piece that is separate from the frame and the lower frame is equipped, and the engaging piece has a fixing portion that is fixed to the lower frame and the engaging claw portion.

3. The lower structure of a bathroom entrance / exit as described in claim 2, characterized in that the engagement piece further has a hanging portion hanging from the fixed portion, and the engagement claw portion is formed at the lower end of the hanging portion.

4. The lower frame has a press-fit groove formed therein that extends in the longitudinal direction of the lower frame and opens toward the frame, The lower structure of a bathroom entrance / exit as described in claim 3, characterized in that the fixing portion protrudes from the upper end of the hanging portion on the opposite side to the frame and is pressed into the press-fit groove.

5. The lower structure of a bathroom entrance / exit as described in claim 4, characterized in that a first protrusion is formed at the opening end of the press-fit groove, a second protrusion is formed on the fixing portion of the engaging piece, and the fixing portion is pressed into the press-fit groove so that the second protrusion overcomes the first protrusion.

6. The lower structure of the bathroom entrance as described in claim 3, characterized in that the fixing portion of the engaging piece is fixed to the underside of the lower frame.

7. An engagement piece that is separate from the frame and the lower frame is provided, and the engagement piece has a fixed portion that is fixed to a wall portion of the frame that faces the adjacent room side, and the engagement receiving portion that protrudes from the fixed portion to the adjacent room side, The lower structure of a bathroom entrance as described in claim 1, characterized in that the lower frame has a protruding end portion that protrudes toward the frame, and this protruding end portion serves as the engaging claw portion.

8. First and second engagement pieces are provided which are separate from the frame and the lower frame, The lower structure of a bathroom entrance / exit as described in claim 1, characterized in that the first engaging piece has a fixed portion fixed to the underside of the lower frame and the engaging claw portion, and the second engaging piece has a fixed portion fixed to the wall of the frame facing the adjacent room and the engaging receiving portion.

9. The bathroom is equipped with a frame arranged along the side edge of the bathroom floor, and a lower frame that spans between the floor of the adjacent room and the frame. The frame has an insertion groove formed along its longitudinal direction, and the side edge of the lower frame on the bathroom side has an insertion protrusion that is inserted into the insertion groove, and a watertight material is interposed between the bottom of the insertion groove and the insertion protrusion. An engagement receiving portion is provided on the adjacent room side of the frame, and an engagement claw portion is provided on the lower frame, a watertight material installation step of installing the watertight material in the insertion groove; a lower frame installation process of inserting the insertion convex portion of the lower frame into the insertion concave groove of the frame and engaging the engagement claw portion with the engagement receiving portion; A watertight material hardening process in which the watertight material is hardened and, during this hardening process, the engagement claw portion and the engagement receiving portion are engaged to restrict upward displacement of the lower frame; A method for installing a lower frame in the lower structure of a bathroom entrance, characterized by comprising:

10. Furthermore, an engagement piece that is separate from the frame and the lower frame is provided, and the engagement piece has a fixing portion and the engagement claw portion, The method further includes a step of assembling a lower frame assembly by fixing the fixing portion of the engagement piece to the lower frame prior to the lower frame installation step, A method for installing a lower frame in the lower structure of a bathroom entrance / exit, as described in claim 9, characterized in that in the lower frame installation process, the insertion convex portion of the lower frame assembly is inserted into the insertion groove of the frame, and the engaging claw portion of the lower frame assembly is engaged with the engaging receiving portion of the frame.

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