JP7400747B2 - Waterproof structure and water-shielding sheet for the opening - Google Patents

Description

The present invention relates to a waterproof structure and a water-shielding sheet for an opening provided above a pit.

Conventionally, a structure in which a waterproof sheet is provided along the inner wall surface of a pit in order to suppress water from entering the pit is known (for example, Patent Document 1).

Further, in the structure of Patent Document 1, in order to suppress water from entering the pit from the opening provided above the pit, the lid of the opening is located below the upper lid and the upper lid. It has an inner lid.

Publication No. 7-7389

Furthermore, if it is necessary to more reliably prevent water from entering, a structure in which a packing is provided around the periphery of the inner lid may be considered. However, even with such a structure, if the vehicle load is repeatedly applied to the lid, the gap between the lid and the member supporting the lid increases, or the packing deteriorates, causing the lid to become loose. There was a risk that water would easily leak into the pit.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a waterproof structure and a water-shielding sheet for an opening that can further improve the reliability of the waterproof performance of the opening provided above the pit.

In order to solve the above-mentioned problems and achieve the purpose, a waterproof structure for an opening according to one embodiment of the present invention includes the following:
(1) A water-shielding sheet that has a bag shape and is attached to the inner peripheral surface of an opening provided on the upper side of the pit with the bag shape opened downward, the water-shielding sheet A peripheral wall along the inner circumferential surface at least in the lower part, and a watertight fastener that allows the upper part of the water-shielding sheet to be opened and closed, forms an entrance/exit for a worker or a working machine in the open state, and prevents water from entering in the closed state. A waterproof structure for an opening including a water-blocking sheet and a sealing structure for sealing between the inner circumferential surface and the peripheral wall, the water-blocking sheet being stored below the lid of the opening. and an extended state in which the lid of the opening is removed and the upper end of the water-blocking sheet is located at approximately the same position as the ground surface or above the ground surface.

The waterproof structure of the opening according to one aspect of the present invention includes:
(2) A water-shielding sheet that has a bag shape and is attached to the inner peripheral surface of an opening provided on the upper side of the pit with the bag shape opened downward, the water-shielding sheet A peripheral wall along the inner circumferential surface at least in the lower part, and a watertight fastener that allows the upper part of the water-shielding sheet to be opened and closed, forms an entrance/exit for a worker or a working machine in the open state, and prevents water from entering in the closed state. A waterproof structure for an opening including a water-blocking sheet and a sealing structure for sealing between the inner circumferential surface and the peripheral wall, the water-blocking sheet being stored below the lid of the opening. and an extended state in which the lid of the opening is removed and the upper end of the water-blocking sheet is located at approximately the same position as the closed position of the lid of the opening or located above the closed position. Deformable.

(3) In the waterproof structure for the opening described in (1) above, in the extended state, the watertight fastener may be located at approximately the same position as the ground surface or above the ground surface.

(4) In the waterproof structure for the opening in (2) above, in the extended state, the watertight fastener may be positioned at approximately the same position as the closed position or above the closed position.

(5) In the waterproof structure for the opening of any one of (1) to (4) above, the opening area of the entrance may be greater than or equal to the opening area of the opening in the extended state.

(6) In the waterproof structure for the opening described in (5) above, the water-blocking sheet may have a plurality of portions having different widths.

(7) In the waterproof structure for the opening according to any one of (1) to (6) above, the seal structure extends laterally along the inner circumferential surface, is attached on the inner circumferential surface, and a pressure receiving member having a pressure receiving surface facing opposite to the inner circumferential surface; a pressing member extending in the lateral direction and sandwiching the peripheral wall between the pressure receiving surface; and a pressing member having the pressing member facing the pressure receiving member. It may also include a pressing mechanism for pressing.

(8) The waterproof structure for the opening in (7) above may include a water-expandable sealing material between the pressure receiving surface and the peripheral wall.

(9) In the waterproof structure for the opening in (8) above, the pressing member may include an extending portion extending in the lateral direction and an inward flange protruding from the extending portion.

(10) The waterproof structure of the opening in any one of (1) to (9) above includes a first hook provided on the inner circumferential surface and a first hook provided on the water-blocking sheet in the stored state. The first hook part and a second hook part to be hooked may be provided.

(11) In the waterproof structure for the opening of (10) above, the second hook portion may be provided at the upper end of the water-blocking sheet.

The water-blocking sheet according to one aspect of the present invention is
(12) A water-blocking sheet having a bag shape, the bag shape being attached to the inner circumferential surface of an opening provided in the upper side of the pit with the bag shape opening downward into the opening, a peripheral wall along the inner circumferential surface at least at the lower part of the water-shielding sheet; and a watertight fastener that allows the upper part of the water-shielding sheet to be opened and closed, and forms an entrance/exit for a worker or a working machine in the open state and prevents water from entering in the closed state. A flexible water-shielding sheet having a storage state in which it is stored under the lid of the opening, and a state in which the lid of the opening is removed and the upper end of the water-shielding sheet is approximately flush with the ground surface. It is deformable between the position and the extended state located above the ground surface.

The water-blocking sheet according to one aspect of the present invention is
(13) A water-blocking sheet having a bag shape, the bag shape being attached to the inner circumferential surface of an opening provided in the upper side of the pit with the bag shape opening downward into the opening, a peripheral wall along the inner circumferential surface at least at the lower part of the water-shielding sheet; and a watertight fastener that allows the upper part of the water-shielding sheet to be opened and closed, and forms an entrance/exit for a worker or a working machine in the open state and prevents water from entering in the closed state. , the flexible water-shielding sheet has a storage state in which it is stored under the lid of the opening, and a storage state in which the lid of the opening is removed and the upper end of the water-shielding sheet is placed under the lid of the opening. It is possible to deform between the closed position and the extended state, which is approximately the same position as the closed position, or an extended state located above the closed position.

According to the waterproof structure for the opening and the water-blocking sheet of the present invention, the reliability of the waterproof performance in the opening provided above the pit can be further improved.

FIG. 1 is an exemplary and schematic vertical cross-sectional view of a waterproof structure for an opening according to an embodiment, and is a diagram showing an extended state of a water-blocking sheet. FIG. 2 is an exemplary and schematic vertical cross-sectional view of the waterproof structure of the opening according to the embodiment, and is a diagram showing an extended state of the water-blocking sheet in a vertical cross-section orthogonal to FIG. FIG. 3 is an exemplary and schematic plan view of the waterproof structure of the opening of the embodiment, and is a diagram showing an extended state of the water-blocking sheet. FIG. 4 is an exemplary and schematic vertical cross-sectional view of the waterproof structure of the opening of the embodiment, and is a view showing the stored state of the water-blocking sheet in the same vertical cross-section as FIG. 2. FIG. 5 is an exemplary and schematic plan view of a part of the seal structure of the waterproof structure for the opening of the embodiment.

Exemplary embodiments of the invention are disclosed below. The configuration of the embodiment shown below, and the actions and results (effects) brought about by the configuration are examples. The present invention can be realized by configurations other than those disclosed in the following embodiments. Further, according to the present invention, it is possible to obtain at least one of various effects (including derivative effects) obtained by the configuration.

In this specification, the direction in which the opening 100 extends is referred to as the vertical direction or the up-down direction, and the direction orthogonal to the vertical direction is referred to as the horizontal direction. In each figure, the X direction and the Y direction are along the horizontal direction, and the Z direction is along the vertical direction. Typically, the Z direction is approximately vertically upward, but is not limited thereto. Further, in the embodiment, the shape of the cross section of the opening 100 perpendicular to the Z direction is approximately rectangular. The X direction is the longitudinal direction of the rectangular cross section, and the Y direction is the lateral direction. The X direction, Y direction, and Z direction intersect with each other and are orthogonal to each other. Further, the Z direction may also be referred to as an upward direction or a direction opposite to the depth direction.

[Embodiment]
FIG. 1 is a longitudinal sectional view along the X direction of a waterproof structure 1 of an opening 100 provided above a pit (not shown), and is a sectional view taken along the line II in FIG. 3. FIG. 2 is a longitudinal cross-sectional view of the waterproof structure 1 along the Y direction, and is a cross-sectional view taken along line II-II in FIG. Moreover, both FIGS. 1 and 2 are cross-sectional views of the opening 100 with the lid 200 removed and the water-blocking sheet 10 in an extended state. The extended state may also be referred to as the expanded state.

The opening 100 is, for example, a manhole that opens into the ground surface G. Further, a pit is, for example, a recess or a chamber provided under the ground. For example, equipment that should be protected from water is housed in the pit. The ground surface G is a surface on which a worker stands or sits while working, and may also be referred to as a work surface. The ground surface G is, for example, a road surface. Note that the ground surface G and the surface (upper surface) of the lid 200 do not have to be flush with each other, that is, they may be shifted in the Z direction.

The opening 100 is a space (hole) surrounded by a pair of planar side surfaces 100a that are substantially parallel to each other and a pair of planar side surfaces 100b that are substantially parallel to each other. That is, the cross section of the opening 100 perpendicular to the Z direction has a substantially rectangular shape. The side surface 100a is along the Z direction and the X direction, and the side surface 100b is along the Z direction and the Y direction. Further, the width W1x (see FIG. 1) of the opening 100 in the longitudinal direction is larger than the width W1y (see FIG. 2) of the opening 100 in the lateral direction. Note that the width W1x is also the width of the side surface 100a, and the width W1y is also the width of the side surface 100b. The two side surfaces 100a and the two side surfaces 100b constitute an inner circumferential surface of the opening 100.

A support frame 110 that supports the lid 200 is provided at the upper end of the opening 100. The support frame 110 has a rectangular frame-like shape. The support frame 110 has the same shape in both the cross section of FIG. 1 and the cross section of FIG. The support frame 110 has a vertical wall 111, an inward flange 112, an outward flange 113, and a lid support 114.

The vertical wall 111 is along the side surface 100a or the side surface 100b. The vertical wall 111 is plate-shaped and extends in the Z direction as well as in the X direction or the Y direction. The vertical wall 111 has a rectangular cylindrical shape as a whole.

The inward flange 112 protrudes from the opposite end of the vertical wall 111 in the Z direction, that is, from the lower end, substantially along the normal direction of the side surface 100a or the side surface 100b (hereinafter referred to as inward direction). There is. The inward flange 112 is plate-shaped. A portion of the inward flange 112 that protrudes from the side surface 100b in the X direction or in the opposite direction to the X direction extends in the Y direction with a substantially constant width in the X direction. Further, a portion of the inward flange 112 that protrudes from the side surface 100a along the Y direction or the opposite direction to the Y direction extends in the X direction with a substantially constant width in the Y direction. The inward flange 112 has an overall rectangular frame shape.

The outward flange 113 protrudes from a substantially middle position of the vertical wall 111 in the Z direction toward the opposite side to the inward flange 112 . The outward flange 113 is fixed to the foundation block of the opening 100, thereby fixing the support frame 110 to the opening 100.

The lid support part 114 has a projecting wall 114a that projects inward at a position away from the end of the vertical wall 111 in the Z direction in the opposite direction to the Z direction, and a side surface 100a or a side surface as it goes in the Z direction from the projecting wall 114a. 100b. The sloped surface 114b faces the sloped surface provided on the side surface (outer peripheral surface) of the lid 200, and supports the sloped surface of the lid 200 and thus the lid 200.

The opening area of the opening 100 is defined as the opening area in the narrowest cross section near the opening end of the opening 100, in this embodiment, in the support frame 110 and its vicinity. In this embodiment, as an example, the opening area of the opening 100 is the opening area of the inward flange 112 of the support frame 110. That is, the opening area of the opening 100 is approximately equal to W2x×W2y, where the width in the X direction of the opening in the inward flange 112 is W2x (see FIG. 1), and the width in the Y direction is W2y (see FIG. 2). It's the size.

The water-blocking sheet 10 has waterproof properties. The material of the water-blocking sheet 10 is, for example, an elastomer such as synthetic rubber. Moreover, the water-blocking sheet 10 has flexibility. The water-blocking sheet 10 is deformable between an extended state as shown in FIGS. 1 and 2 and a stored state as shown in FIG. 4.

The water-blocking sheet 10 is a bag-shaped membrane. That is, the water-blocking sheet 10 has a bag shape. The water-blocking sheet 10 is attached to the side surfaces 100a and 100b of the opening 100, with the bag shape opened in the opposite direction to the Z direction, that is, downward in the opening 100. In this embodiment, the bag-shaped opening of the water-blocking sheet 10, that is, the peripheral edge 11a of the opening in the opposite direction in the Z direction is attached to the side surfaces 100a and 100b via the seal structure 20. No holes are provided in the water-blocking sheet 10 except for the portion supported by the seal structure 20. The seal structure 20 may also be referred to as a fixing structure for the water-blocking sheet 10.

The water-blocking sheet 10 has a peripheral wall 11 and a ceiling wall 12. In the extended state shown in FIGS. 1 and 2, the peripheral wall 11 extends in the Z direction. Further, the peripheral wall 11 extends along the side surfaces 100a and 100b at least within the opening 100 or at the end of the peripheral wall 11 in the Z direction, that is, at the lower part. In the extended state shown in FIGS. 1 and 2, the ceiling wall 12 covers the end of the peripheral wall 11 in the Z direction, intersects with the Z direction, and extends substantially perpendicularly thereto. In this embodiment, the ceiling wall 12 is the upper part of the water-shielding sheet 10 and the upper end thereof.

In the extended state, the ceiling wall 12 is located above the ground surface G or the closed position of the lid 200 of the opening 100. However, the present invention is not limited thereto, and the ceiling wall 12 may be located at substantially the same position as the ground surface G or the closed position of the lid 200.

The peripheral wall 11 extends from the bottom to the top of the water-blocking sheet 10. Further, the width of the peripheral wall 11 in the lateral direction changes depending on the position in the Z direction. In other words, the peripheral wall 11 has a plurality of portions having different widths. As shown in FIGS. 1 and 2, in both the cross section along the X direction and the cross section along the Y direction, the widths W31x and W31y of the ends in the Z direction of the water shielding sheet 10 are the largest (widest), and The widths W32x and W32y of the intermediate portion of the sheet 10 in the Z direction are the smallest (narrowest). Further, as shown in FIG. 1, in the cross section along the X direction, the width W33x of the end of the water-shielding sheet 10 in the opposite direction to the Z direction is between the width W31x and the width W32x. 2, in the cross section along the Y direction, the width W33y of the end of the water shielding sheet 10 in the direction opposite to the Z direction is between the width W31y and the width W32y. That is, the water-blocking sheet 10 is constricted at the middle portion in the Z direction. However, such width setting is only an example.

Further, as is clear from FIG. 1, the width W31x of the upper end of the water-blocking sheet 10 in the X direction is larger than the width W2x of the opening of the opening 100 in the X direction, and as is clear from FIG. The width W31y of the upper end of the water-blocking sheet 10 in the Y direction is larger than the width W2y of the opening of the opening 100 in the Y direction.

A watertight fastener 13 is provided at the end of the water-blocking sheet 10 in the Z direction, in this embodiment, for example, at the end of the peripheral wall 11 in the Z direction. The watertight fastener 13 extends from the end of the peripheral wall 11 in the Z direction to the opposite part in the Y direction (see FIG. 1), the part in the X direction (see FIG. 2), and the part in the Y direction (not shown). , extending in a U-shape along a virtual plane perpendicular to the Z direction. Note that the portion of the peripheral wall 11 in the Y direction has a shape that is left and right opposite to that in FIG. 2 .

In the extended state, the watertight fastener 13 is exposed above the ground surface G or the closed position of the lid 200, that is, outside the opening 100. However, the present invention is not limited thereto, and the watertight fastener 13 may be located at substantially the same position as the ground surface G or the closed position of the lid 200 in the extended state. Note that in the stretched state of the water-blocking sheet 10, the watertight fastener 13 is located at the upper end of the water-blocking sheet 10, but the present invention is not limited thereto.

The watertight fastener 13 is a wire fastener, and includes two tapes in which a plurality of elements are alternately provided at intervals, and a slider (both not shown) that slides the two tapes. By moving the slider along the two tapes, the closed state shown in FIGS. 1 and 2 and the open state shown by the two-dot chain line in FIG. 1 are switched. The watertight fastener 13 prevents water from entering in the closed state. A portion including the ends of the top wall 12 and the peripheral wall 11 in the Z direction is the lid 14 of the water-blocking sheet 10 . Further, in the open state, the lid 14 is opened due to the separation of the tapes, and an opening 13a is formed. In this way, the watertight fastener 13 allows the lid 14 provided on the upper part of the water-shielding sheet 10 to be opened and closed, and in the open state, the opening 13a serves as an entrance/exit for a worker or a working machine. Note that the watertight fastener 13 may be provided on the top wall 12 or may be provided on a corner between the peripheral wall 11 and the top wall 12.

The opening area of the opening 13a formed by opening the lid 14 is approximately equal to W4x×W31y (see FIG. 2), where the width of the opening 13a in the X direction is W4x (see FIG. 1). As described above, the opening area of the opening 100 is W2x×W2y. Here, as is clear from FIG. 1, W4x>W2x, and as is clear from FIG. 2, W31y>W2y, so W4x×W31y>W2x×W2y. That is, the opening area (W4x×W31y) of the opening 13a formed by opening the lid 14 is larger than the opening area (W2x×W2y) of the opening 100.

FIG. 3 is a plan view of the waterproof structure 1 with the waterproof sheet 10 in an extended state. As shown in FIG. 3, the ceiling wall 12 is provided with a plurality of hooks 15. As shown in FIG. 3, in this embodiment, four hooks 15 are provided on the ceiling wall 12. Each hook 15 has a strap 15a and a claw 15b. A claw 15b is attached to one end of the strap 15a, and the other end of the strap 15a is fixed to the ceiling wall 12. Note that the number and position of the hooks 15 are not limited to the example of FIG. 3.

FIG. 4 is a sectional view of the waterproof structure 1 at the same position as FIG. 2 with the waterproof sheet 10 in the stored state. As shown in FIG. 4, when the lid 200 is closed, the flexible water-shielding sheet 10 opens in the opposite direction in the Z direction with respect to the lid 200, that is, at the opening below the lid 200. It is housed in a space S within 100. The stored state may also be referred to as a folded state.

An eye bolt 115 protrudes from the side surface 100a of the opening 100. The eye bolt 115 is provided so that the hook 15 can be hooked thereto in the stored state. In this embodiment, as an example, the eye bolt 115 is provided between the support frame 110 and the seal structure 20. In the stored state, the hooks 15 are caught on the eye bolts 115, so that the water-blocking sheet 10 can be prevented from significantly hanging downward within the opening 100. Note that the position and number of the eyebolts 115 are not limited to the example shown in FIG. 4, and may be provided so as to protrude from the side surface 100b, or may be provided on the support frame 110, for example. The eye bolt 115 is an example of a first hook, and the hook 15 is an example of a second hook.

The water-blocking sheet 10 is attached to the opening 100 via the seal structure 20. The seal structure 20 seals between the peripheral wall 11 and the side surfaces 100a and 100b of the water-blocking sheet 10, and prevents water from entering. FIG. 5 is a plan view (partial sectional view) of a part of the seal structure 20 viewed in the Z direction. The seal structure 20 includes a pressure receiving member 21, a pressing member 22, an adhesive 23, a pressing mechanism 24, and a water-expandable sealing material 25.

The pressure receiving member 21 has a band-like and plate-like shape. The pressure receiving member 21 extends along the side surface 100a or the side surface 100b. The pressure receiving member 21 has a substantially constant width in the Z direction and a substantially constant thickness in the normal direction of the side surface 100a or the side surface 100b along which the pressure receiving member 21 runs. The pressure receiving member 21 is made of a metal material that does not easily corrode, such as stainless steel, for example.

The pressure receiving member 21 is attached to the side surface 100a or the side surface 100b via a waterproof adhesive 23. The adhesive 23 is, for example, an epoxy resin adhesive.

On the side surfaces 100a and 100b, a plurality of pressure receiving members 21 may be arranged in the horizontal direction (X direction or Y direction), or one pressure receiving member 21 may be provided on each of the side surfaces 100a and 100b.

The pressure receiving member 21 has a pressure receiving surface 21a on the side opposite to the side surface 100a or the side surface 100b. The pressure receiving surface 21a is a plane extending in the Z direction and the X or Y direction. The pressure receiving surface 21a is substantially parallel to the side surface 100a or the side surface 100b.

The water-expandable sealing material 25, the peripheral wall 11 of the water-blocking sheet 10, and the pressing member 22 are stacked in this order on the pressure-receiving surface 21a. The pressure receiving surface 21a becomes a sealing surface in the seal structure 20. By providing the pressure-receiving member 21 having the pressure-receiving surface 21a, it becomes easier to form a flatter surface and improve sealing performance than when the side surfaces 100a and 100b directly serve as sealing surfaces.

The pressing member 22 extends in the X direction or the Y direction (lateral direction) along the side surfaces 100a and 100b. The pressure receiving member 21 is made of a metal material that does not easily corrode, such as stainless steel, for example. The pressing member 22 has an extending portion 22a and an inward flange 22b.

The extending portion 22a has a band-like and plate-like shape. The extending portion 22a extends along the side surface 100a or the side surface 100b. Further, the extending portion 22a has a substantially constant width in the Z direction and a substantially constant thickness in the normal direction of the side surface 100a or the side surface 100b along which the pressing member 22 runs.

The extending portion 22a overlaps the pressure receiving member 21 and the pressure receiving surface 21a in the normal direction of the side surface 100a or the side surface 100b. The extending portion 22a has a pressing surface 22a1 on the side facing the side surface 100a or the side surface 100b. The pressing surface 22a1 is a plane extending in the Z direction and the X or Y direction. The pressing surface 22a1 is substantially parallel to the opposing pressure receiving surface 21a, and substantially parallel to the side surface 100a or the side surface 100b.

The inward flange 22b projects toward the inside of the opening 100 from the extending portion 22a. The inward flange 22b has a band-like and plate-like shape. The inward flange 22b has a substantially constant width in the normal direction of the side surface 100a or 100b along which the extending portion 22a runs, and a substantially constant thickness in the Z direction.

As shown in FIG. 4, in the pressing member 22, the inward flange 22b projects inward from the Z-direction end of the extending portion 22a. That is, the shape of the cross section perpendicular to the extending direction of the pressing member 22 has a substantially L-shape. However, the shape of the pressing member 22 is not limited to this, and the inward flange 22b may protrude inward from the end opposite to the Z direction, for example. Further, the inward flange 22b may protrude from, for example, an intermediate position in the Z direction of the extending portion 22a. In this case, the shape of the cross section perpendicular to the extending direction of the pressing member 22 has a substantially T-shape. In this way, the inward flange 22b is configured to have a substantially L-shaped or substantially T-shaped cross-sectional shape, thereby increasing its bending rigidity.

As shown in FIG. 5, the water-expandable sealing material 25 and the peripheral wall 11 of the water-blocking sheet 10 are sandwiched between the pressure-receiving surface 21a of the pressure-receiving member 21 and the pressing surface 22a1 of the pressing member 22. There is. The water-expandable sealing material 25 is a sealing material that expands in volume by absorbing water. In this embodiment, the area outside the peripheral wall 11, that is, between the peripheral wall 11 and the side surface 100a or the side surface 100b is a wet area. Therefore, the water-expandable sealing material 25 is provided between the peripheral wall 11 and the pressure-receiving member 21. Note that the water-expandable sealing material 25 may entirely cover the space between the water-blocking sheet 10 and the side surface 100a or the side surface 100b at the end of the seal structure 20 in the Z direction.

The pressing mechanism 24 includes an anchor bolt 24a and a nut 24b. Anchor bolt 24a is embedded in the foundation block of opening 100, and protrudes from side surface 100a or side surface 100b in the normal direction of side surface 100a or side surface 100b. Anchor bolt 24a may also be referred to as a stud bolt. The anchor bolt 24a passes through the pressure receiving member 21, the peripheral wall 11 of the water-blocking sheet 10, and the extending portion 22a of the pressing member 22. That is, although not shown in the drawings, the pressure receiving member 21, the peripheral wall 11, and the extending portion 22a are provided with a through hole or a notch opened in the opposite direction to the Z direction as an opening. The nut 24b is connected to the thread on the tip side of the anchor bolt 24a, and when tightened, the nut 24b approaches the pressure receiving member 21 and presses the extending portion 22a toward the pressure receiving member 21. This increases the surface pressure between the outer surface of the peripheral wall 11 and the water-expanding sealing material 25 and the surface pressure between the water-expanding sealing material 25 and the pressure-receiving surface 21a between the pressing surface 22a1 and the pressure-receiving surface 21a. This makes it possible to prevent water from entering (downward) into the opening 100 through the space between the peripheral wall 11 and the pressure receiving member 21. Further, the seal structure 20 holds the peripheral wall 11 between the pressing member 22 and the pressure receiving member 21 by the pressing force of the pressing mechanism 24, thereby fixing the water-blocking sheet 10 to the opening 100. Note that the pressing mechanism 24 is not limited to this, and may include, for example, a nut embedded in the foundation block of the opening 100 and a bolt coupled to and tightened to the nut.

The seal structure 20 has a plurality of pressing members 22. In this embodiment, a plurality of pressing members 22 are arranged laterally on the side surface 100a or the side surface 100b. Further, in this embodiment, an L-shaped pressing member 22 having a portion facing the side surface 100a and a portion facing the side surface 100b is provided at the corner between the side surface 100a and the side surface 100b. .

As shown in FIG. 5, a boundary B1 between two horizontally adjacent pressure receiving members 21 and a boundary B2 between two horizontally adjacent pressing members 22 are shifted from each other in the horizontal direction. If the boundary B1 and the boundary B2 are lined up in the normal direction of the side surface 100a or the normal direction of the side surface 100b, the surface pressure between the outer surface of the peripheral wall 11 and the water-expandable sealing material 25 and the water expansion will occur at the relevant location. The surface pressure between the sealing material 25 and the pressure receiving surface 21a decreases, making water leakage more likely. In this regard, in this embodiment, since the boundary B1 and the boundary B2 are shifted in the lateral direction, it is possible to suppress water leakage due to a decrease in surface pressure.

Further, in this embodiment, the inclined surfaces are configured to contact each other at the boundary B1 between two pressure receiving members 21 that are adjacent to each other in the lateral direction. In the example of FIG. 5, at the boundary B1 between the two pressure receiving members 21 arranged in the X direction along the side surface 100a, the two pressure receiving members 21 sandwiching the boundary B1 in the normal direction of the side surface 100a (opposite direction to the Y direction) are The inclined surfaces that are arranged side by side and are inclined with respect to the horizontal direction (X direction) are in contact with each other. As a result, since the pressure receiving members 21 are easily deformed in the vicinity of the boundary B1, it becomes easier to obtain a state in which the two pressure receiving members 21 are in contact with each other at the boundary B1 due to the pressure by the pressing mechanism 24, and the sealing performance at the boundary B1 is further improved. can be increased. Note that the water-expandable sealing material 25 may be interposed at the boundary B1.

As described above, in this embodiment, the water-blocking sheet 10 is deformable between the stored state in which it is stored under the closed lid 200 and the extended state. In the extended state, the ceiling wall 12 serving as the upper end of the water-blocking sheet 10 is located above the ground surface G or the closed position of the lid 200. Alternatively, in the extended state, the ceiling wall 12 is located at substantially the same position as the ground surface G or the closed position of the lid 200. Further, the watertight fastener 13 allows the upper part of the water-shielding sheet 10 to be opened and closed, and in the open state forms an entrance/exit for a worker or a working machine.

Further, as in this embodiment, the watertight fastener 13 may be located above the ground surface G or the closed position of the lid 200 in the extended state. Alternatively, in the extended state, the watertight fastener 13 may be located at substantially the same position as the ground surface G or the closed position of the lid 200.

In such a configuration, the water-shielding sheet 10 is stored below the lid 200 of the opening 100 in the stored state, so that it is not shielded by, for example, direct application of vehicle load or direct sunlight. Deterioration of the water sheet 10 is suppressed, and reliability of waterproofing downward of the opening 100 in the waterproof structure 1 can be improved. In addition, when the water-blocking sheet 10 is in the extended state, the worker is positioned higher than when the upper end of the water-blocking sheet 10 and the watertight fastener 13 are located below the ground surface G or the closed position of the lid 200. The watertight fastener 13 can be opened and closed more easily, more quickly, or more safely.

Further, as in this embodiment, the opening area of the opening 13a serving as the entrance/exit may be greater than or equal to the opening area of the opening 100.

Such a configuration provides the advantage that, for example, a worker or a working machine can pass through the opening 13a more easily or more quickly.

Further, as in this embodiment, the water-blocking sheet 10 may have a plurality of portions having different widths.

According to such a configuration, for example, it is easy to configure the water-blocking sheet 10 into a shape that makes it difficult to interfere with structures such as the support frame 110 and the eye bolts 115. Therefore, damage to the water-blocking sheet 10 due to interference with the structure can be suppressed.

Further, as in the present embodiment, the seal structure 20 includes a pressure receiving member 21, a pressing member 22, and a pressing mechanism 24, and the pressing mechanism 24 presses the pressing member 22 against the pressure receiving member 21, and presses the pressing member 22 against the pressure receiving member 21. The peripheral wall 11 of the water-blocking sheet 10 may be sandwiched between the pressure receiving member 21 having the pressure member 21a and the pressing member 22.

According to such a configuration, for example, the pressure receiving surface 21a that is flatter than the side surfaces 100a and 100b can be configured as the sealing surface of the sealing structure 20, so that the waterproofness of the sealing structure 20 can be more easily improved.

Further, as in the present embodiment, the waterproof structure 1 may include a water-expandable sealing material 25 between the pressure receiving surface 21a and the peripheral wall 11.

According to such a configuration, for example, the waterproofness of the waterproof structure 1 can be further improved.

Further, as in the present embodiment, the pressing member 22 may include an extending portion 22a extending in the horizontal direction and an inward flange 22b protruding from the extending portion 22a.

According to such a configuration, for example, deformation of the pressing member 22 due to the pressing force of the pressing mechanism 24 is suppressed, and the surface pressure between the outer surface of the peripheral wall 11 and the water-expanding seal material 25 due to the deformation is reduced, and the water-expanding seal is It is possible to suppress a decrease in the surface pressure between the material 25 and the pressure-receiving surface 21a, and in turn, it is possible to suppress a decrease in the waterproofness of the waterproof structure 1.

Further, as in the present embodiment, the waterproof structure 1 includes an eye bolt 115 (first hook portion) and a hook 15 (second hook portion) that is provided on the water-blocking sheet 10 and hooks on the eye bolt 115 in the stored state. You can.

According to such a configuration, for example, it is possible to suppress the water-blocking sheet 10 from significantly hanging downward in the stored state.

Further, as in this embodiment, the hooks 15 may be provided on the ceiling wall 12 as the upper end of the water-blocking sheet 10.

According to such a configuration, for example, it is possible to suppress the water-blocking sheet 10 from drooping further downward in the stored state.

Although the embodiments of the present invention have been illustrated above, the above embodiments are merely examples and are not intended to limit the scope of the invention. The embodiments described above can be implemented in various other forms, and various omissions, substitutions, combinations, and changes can be made without departing from the gist of the invention. In addition, specifications such as each configuration, shape, etc. (structure, type, direction, model, size, length, width, thickness, height, number, arrangement, position, material, etc.) may be changed as appropriate. It can be implemented by

For example, the cross-sectional shape of the opening is not limited to a rectangular shape, and may be other shapes such as a square shape or a circular shape.

1...Waterproof structure 10...Waterproof sheet 11...Peripheral wall 11a...Peripheral portion 12...Ceiling wall (upper end)
13... Watertight fastener 13a... Opening 14... Lid 15... Hook (second hook part)
15a... Strap 15b... Claw 20... Seal structure 21... Pressure receiving member 21a... Pressure receiving surface 22... Pressing member 22a... Extended portion 22a1... Pressing surface 22b... Inward flange 23... Adhesive 24... Pressing mechanism 24a... Anchor bolt 24b... Nut 25... Water expansion sealing material 100... Openings 100a, 100b... Side surfaces (inner peripheral surface)
110... Support frame 111... Vertical wall 112... Inward flange 113... Outward flange 114... Lid support part 114a... Projection wall 114b... Inclined surface 115... Eye bolt (first hook part)
200... Lid B1, B2... Boundary G... Ground surface S... Space W1x, W1y... Width W2x, W2y... Width W31x, W31y, W32x, W32y, W33x, W33y... Width W4x... (of opening) width

Claims (13)

A water-shielding sheet having a bag shape and attached to the inner peripheral surface of an opening provided on the upper side of the pit with the bag shape opened downward, the water-shielding sheet having at least a lower part of the water-shielding sheet. A water-shielding sheet having a peripheral wall along the inner circumferential surface, and a watertight fastener that allows the upper part of the water-shielding sheet to be opened and closed, forms an entrance and exit for a worker or a working machine in the open state, and prevents water from entering in the closed state. and,
a seal structure that seals between the inner peripheral surface and the peripheral wall;
A waterproof structure with an opening,
The water-shielding sheet can be stored in a stored state below the lid of the opening, or in a state where the lid of the opening is removed and the upper end of the water-shielding sheet is at approximately the same position as the ground surface or above the ground surface. A waterproof structure with an opening that can be deformed between an extended state located at A water-shielding sheet having a bag shape and attached to the inner peripheral surface of an opening provided on the upper side of the pit with the bag shape opened downward, the water-shielding sheet having at least a lower part of the water-shielding sheet. A water-shielding sheet having a peripheral wall along the inner circumferential surface, and a watertight fastener that allows the upper part of the water-shielding sheet to be opened and closed, forms an entrance and exit for a worker or a working machine in the open state, and prevents water from entering in the closed state. and,
a seal structure that seals between the inner peripheral surface and the peripheral wall;
A waterproof structure with an opening,
The water-shielding sheet may be stored in a stored state under the lid of the opening, or when the lid of the opening is removed and the upper end of the water-shielding sheet is at approximately the same position as the closed position of the lid of the opening. A waterproof structure of an opening that can be deformed between an extended state located above the closed position. The waterproof structure for an opening according to claim 1, wherein in the extended state, the watertight fastener can be located at approximately the same position as the ground surface or above the ground surface. 3. The waterproof structure for an opening according to claim 2, wherein in the extended state, the watertight fastener can be located at substantially the same position as the closed position or above the closed position. The waterproof structure for an opening according to any one of claims 1 to 4, wherein in the extended state, the opening area of the entrance is greater than or equal to the opening area of the opening. The waterproof structure for an opening according to claim 5, wherein the water-blocking sheet has a plurality of portions having different widths. The seal structure is
a pressure receiving member that extends laterally along the inner circumferential surface, is attached on the inner circumferential surface, and has a pressure receiving surface facing opposite to the inner circumferential surface;
a pressing member extending in the lateral direction and sandwiching the peripheral wall between it and the pressure receiving surface;
a pressing mechanism that presses the pressing member toward the pressure receiving member;
A waterproof structure for an opening according to any one of claims 1 to 6, comprising: The waterproof structure for an opening according to claim 7, further comprising a water-expandable sealing material between the pressure receiving surface and the peripheral wall. The waterproof structure for an opening according to claim 8, wherein the pressing member has an extending portion extending in the lateral direction and an inward flange protruding from the extending portion. a first hook provided on the inner circumferential surface;
a second hook part provided on the water-blocking sheet and hooked to the first hook part in the stored state;
A waterproof structure for an opening according to any one of claims 1 to 9, comprising: The waterproof structure for an opening according to claim 10, wherein the second hook is provided at an upper end of the water-blocking sheet. A water-shielding sheet having a bag shape and attached to the inner peripheral surface of an opening provided on the upper side of the pit with the bag shape opened downward, the water-shielding sheet having at least a lower part of the water-shielding sheet. A flexible sheet having a peripheral wall along the inner circumferential surface, and a watertight fastener that allows the upper part of the water-shielding sheet to be opened and closed, forms an entrance/exit for a worker or a working machine in the open state, and prevents water from entering in the closed state. A water-blocking sheet,
a storage state in which the lid of the opening is stored below the lid of the opening; and an extended state in which the lid of the opening is removed and the upper end of the water-blocking sheet is located at approximately the same position as the ground surface or located above the ground surface. , a water-blocking sheet that can be transformed between. A water-shielding sheet having a bag shape and attached to the inner peripheral surface of an opening provided on the upper side of the pit with the bag shape opened downward, the water-shielding sheet having at least a lower part of the water-shielding sheet. A flexible sheet having a peripheral wall along the inner circumferential surface, and a watertight fastener that allows the upper part of the water-shielding sheet to be opened and closed, forms an entrance/exit for a worker or a working machine in the open state, and prevents water from entering in the closed state. A water-blocking sheet,
A storage state in which the lid of the opening is stored below the lid of the opening, and a state in which the lid of the opening is removed and the upper end of the water-blocking sheet is at approximately the same position as the closed position of the lid of the opening or above the closed position. A water-shielding sheet that can be deformed between a stretched state and a stretched state.

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