JP2018040239A - Sediment inflow prevention plate for embedded box, embedded box set, sediment inflow prevention structure for embedded box, and fitting method of sediment inflow prevention plate for embedded box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sediment inflow prevention plate for an embedded box of which a single type is compatible with water pipes of different outer diameters, the sediment inflow prevention plate being fitted readily on a water pipe without twisting of a base plate part.SOLUTION: A sediment inflow prevention plate 1 for an embedded box has, at a peripheral part surrounding a water pipe installation hole part 21 of a base plate part 20, a plurality of elastic tongue pieces 25 formed radially with the water pipe installation hole part 21 at a center, the elastic tongue piece protruding toward the water pipe installation hole part 21 from the peripheral part. Furthermore, the elastic tongue piece 25 is curved in a direction along a plate thickness direction of the base plate part 20 toward the water pipe installation hall part 21 when a water pipe P is not installed in the water pipe installation hole part 21, and comes in contact with the water pipe P elastically when the water pipe P is installed in the water pipe installation hole part 21 through the slit part 22 for passing a water pipe.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sediment inflow preventing plate for a buried box that prevents sediment from flowing into a buried box in which a device such as a water meter or a stop cock is accommodated, and a buried box including the sediment inflow preventing plate for the buried box The present invention relates to a sediment inflow prevention structure for a buried box using the sediment inflow prevention plate for a buried box, and a method for attaching the sediment inflow prevention plate for a buried box.

  Conventionally, a sediment inflow prevention plate for a buried box that prevents sediment from flowing into the buried box from a water pipe insertion hole provided in a buried box in which a device such as a water meter or a stop cock is accommodated. Various proposals have been made.

  For example, Patent Document 1 includes a central through hole which has a central through hole corresponding to the outer diameter of a water pipe and has an area covering the cut out hole of the buried box and can withstand the pressure of earth and sand facing the cut out hole. There is disclosed a cover for a water meter buried box made of an elastic synthetic resin having a cutout portion cut out to the outer peripheral edge.

  Further, Patent Document 2 includes a retaining plate provided with a notch at the edge from the water pipe insertion hole. The retaining plate covers the casing and the water pipe introduction portion of the base, and the fixed claw body is attached to the casing. A watering device housing is disclosed in which a housing and a base are connected by engaging with an engagement hole between the base and the base.

  Further, in Patent Document 3, a large number of grooves are formed radially from the peripheral edge of a circular hole provided in the substantially central portion of the synthetic resin substrate portion to form a large number of fan-shaped tongue pieces having appropriate lengths. There is disclosed a closing plate in which a plurality of concave grooves concentric with circular holes are formed at appropriate intervals on a tongue piece.

Japanese Utility Model Publication No. 49-34835 Japanese Patent No. 3045591 Japanese Utility Model Publication 54-26490

  However, in the cover for a water meter buried box of Patent Document 1, since the diameter of the central through hole needs to correspond to the outer diameter of the water pipe, the diameter differs for each water pipe having a different outer diameter. It is necessary to prepare a cover for a water meter buried box having a central through hole, and there is a problem of poor versatility.

  Moreover, in the earth retaining plate of the said patent document 2 and the closing plate of the said patent document 3, since a fan-shaped tongue piece is formed in planar shape, each tongue piece is previously adjusted so that it may match with the outer diameter of a water pipe. Needs to be folded, and it takes time and effort. Moreover, if each tongue piece is not folded in advance to a required length, there is a problem that the retaining plate and the closing plate are twisted in the attached state.

  Therefore, the present invention can be applied to water pipes having different outer diameters with only one kind, and can be easily attached to a water pipe without being twisted when attached to the water pipe. It aims at providing a prevention board.

  It is another object of the present invention to provide a buried box set having the earth-inflow prevention plate for a buried box.

  It is another object of the present invention to provide a structure for preventing sediment inflow of a buried box having the sediment inflow preventing plate for a buried box.

  Another object of the present invention is to provide a method for attaching the earth and sand inflow prevention plate for a buried box.

  The present invention covers the water pipe insertion hole from the outside of the embedded box by being attached to the water pipe inserted into the water pipe insertion hole provided in the embedded box embedded in a predetermined position. It is a soil and sand inflow prevention plate for a buried box that prevents soil and sand from flowing into the buried box through the water pipe insertion hole, and is formed in a penetrating manner in the substrate portion and the substrate portion. A water pipe arrangement hole in which the water pipe is arranged, and a water pipe passage formed in a penetrating manner in the substrate part from the outer edge of the substrate part to the water pipe arrangement hole part An elastic tongue piece extended from the peripheral portion toward the water pipe arrangement hole portion in the peripheral portion surrounding the water pipe arrangement hole portion in the substrate portion. Further formed by the elastic tongue Is curved in one direction along the plate thickness direction of the substrate portion as it goes to the water pipe arrangement hole in a state where the water pipe is not arranged in the water pipe arrangement hole, In a state where the water pipe is arranged in the water pipe arrangement hole through the water pipe passage slit portion, and is in a state of being elastically contacted with the water pipe, is there.

  In such a configuration, with the earth and sand inflow prevention plate for the buried box attached to the water pipe, the tip of the elastic tongue piece part is elastically pressed against the outer peripheral surface of the water pipe, and the water pipe A gap is less likely to occur between the outer peripheral surface of the elastic tongue and the tip of the elastic tongue piece. For this reason, the effect of preventing the inflow of earth and sand into the buried box is improved. Here, since the elastic tongue piece and the water pipe abut in a state where the direction in which the tip of the elastic tongue piece faces and the pipe axis direction of the water pipe substantially coincide, There is no need to strictly correspond to the outer diameter of the water pipe. Further, in such a configuration, since the tip end portion of the elastic tongue piece portion comes into contact with the outer peripheral surface of the water pipe at an appropriate position, when the earth and sand inflow prevention plate for a buried box is attached to the water pipe, the substrate The part will not be twisted. Moreover, since it is not necessary to adjust the length of an elastic tongue piece part as mentioned above, it can respond | correspond flexibly with the 1 type of earth and sand inflow prevention board for buried boxes with respect to the various water pipes from which an outer diameter differs. .

  Moreover, it is desirable that an inclined edge portion that is inclined toward the water pipe passage slit portion is formed on an outer edge portion of the substrate portion that is continuous with the water pipe passage slit portion.

  By adopting such a configuration, it becomes possible to guide the water pipe to the water pipe passage slit portion while following the inclined edge portion to the outer peripheral surface of the water pipe, and workability at the time of attachment is improved.

  Furthermore, it is desirable that the elastic tongue piece portion has a plate piece shape, and the plate thickness of the elastic tongue piece portion includes at least a portion thinner than the plate thickness of the substrate portion.

  By adopting such a configuration, the elastic tongue piece portion can be easily elastically deformed even if the thickness of the substrate portion is increased in terms of securing strength.

  A plurality of the elastic tongue pieces are radially formed around the water pipe arrangement hole, and a base portion of the elastic tongue pieces is larger than a separation distance between the elastic tongue pieces. A configuration in which a notch having a round hole shape with an inner diameter is formed is proposed.

  By setting it as this structure, the said elastic tongue piece part becomes easily elastically deformable from a root part. In addition, it is possible to suitably prevent the root portion from tearing due to an excessive shear stress applied to the root portion of the elastic tongue piece portion.

  Moreover, the outer dimension of the said elastic tongue piece part in the direction orthogonal to the insertion direction of the said elastic tongue piece part may become small as it goes to a front-end | tip.

  By setting it as this structure, when the said elastic tongue piece part contact | abuts to a water pipe, it can make it easy to follow the front-end | tip of the said elastic tongue piece part to the shape of a water pipe.

  And this invention is a burial box set characterized by including the said earth-and-sand inflow prevention board for burial boxes, and the burial box by which the inflow of earth and sand is prevented by the said earth-and-sand inflow prevention board for burial boxes.

  In such a configuration, a buried box capable of preventing inflow of earth and sand can be quickly prepared and constructed at the construction site.

  Here, the earth and sand inflow prevention plate for a buried box may be arranged such that the elastic tongue piece is curved toward the buried box side, or is curved toward the side opposite to the buried box side. May be arranged. However, in particular, the earth and sand inflow prevention plate for the buried box is arranged so that the elastic tongue piece is curved to the side opposite to the side of the buried box. A structure is desirable.

  In such a configuration, it is possible to make the inflow direction of earth and sand and the curved direction of the elastic tongue piece part opposite to each other, so that a structure for preventing inflow of earth and sand in a buried box is constructed in which earth and sand are less likely to flow into the buried box. can do.

  Furthermore, the present invention is a method for attaching the earth and sand inflow prevention plate for a buried box, wherein the water pipe is arranged in the water pipe arrangement hole by passing the water pipe through the water pipe passage slit. And it is the attachment method of the earth and sand inflow prevention board for buried boxes characterized by including the process of elastically contacting the said elastic tongue piece part with the said water pipe.

  In such a configuration, the sediment box inflow prevention plate for the buried box can be easily attached to the water pipe, and the sediment can be suitably prevented from flowing into the buried box.

  In addition, the present invention attaches the water pipe insertion hole from the outside of the embedded box by being attached to the water pipe inserted into the water pipe insertion hole provided in the embedded box embedded in a predetermined position. A buried box earth and sand inflow prevention plate for preventing the earth and sand from flowing into the buried box through the water pipe insertion hole, the substrate part, and penetrating the substrate part A water pipe arrangement hole portion in which the water pipe is formed and a water pipe passage formed in a penetrating manner in the substrate portion from the outer edge of the substrate portion to the water pipe arrangement hole portion. An elastic tongue piece extending from the peripheral portion toward the water pipe arrangement hole portion in a peripheral portion of the base plate portion surrounding the water pipe arrangement hole portion. Is formed, and further the elasticity One part is curved to one side so as to follow the thickness direction of the substrate portion toward the water pipe arrangement hole in a state where the water pipe is not arranged in the water pipe arrangement hole. And the minimum hole diameter of the hole for water pipe arrangement | positioning in the front-end | tip of the said elastic tongue piece part in the state where the said water pipe is not arrange | positioned in the said water pipe arrangement | positioning hole part is the said water supply in the front-end | tip of the said elastic tongue piece part. An earth and sand inflow prevention plate for a buried box having a diameter smaller than an outer diameter of a water pipe arranged at a position of a pipe arrangement hole.

  By adopting such a configuration, when the earth and sand inflow prevention plate for the buried box is attached to the water pipe and the water pipe is arranged in the water pipe arrangement hole, the elastic tongue piece portion is pushed and expanded by the water pipe. The tip of the elastic tongue piece is in elastic contact with the outer peripheral surface of the water pipe. For this reason, it becomes difficult to produce a clearance gap between the outer peripheral surface of the said water pipe, and the front-end | tip part of an elastic tongue piece part. Further, as described above, since the elastic tongue piece and the water pipe abut in a state where the direction in which the tip of the elastic tongue piece faces and the pipe axis direction of the water pipe substantially coincide, It is not necessary for the length of one part to correspond exactly to the outer diameter of the water pipe. Further, in such a configuration, since the tip end portion of the elastic tongue piece portion comes into contact with the outer peripheral surface of the water pipe at an appropriate position, when the earth and sand inflow prevention plate for a buried box is attached to the water pipe, the substrate The part will not be twisted. Moreover, since it is not necessary to adjust the length of an elastic tongue piece part as mentioned above, it can respond | correspond flexibly with the 1 type of earth and sand inflow prevention board for buried boxes with respect to the various water pipes from which an outer diameter differs. . Here, the minimum hole diameter of the water pipe arrangement hole at the tip of the elastic tongue piece corresponds to the inner diameter of the water pipe arrangement hole at the position where the tip of the elastic tongue piece is located. Moreover, when the outer diameter of the water pipe arranged at the position of the water pipe arrangement hole at the tip of the elastic tongue piece portion is arranged in the water pipe arrangement hole of the outer diameter of the water pipe It corresponds to the outer diameter of the water pipe where the tip of the elastic tongue piece is located.

  The earth and sand inflow prevention plate for buried boxes according to the present invention has a high effect of preventing inflow of earth and sand, can be used with water pipes having different outer diameters, and is twisted when attached to the water pipe. There is an effect that can be easily attached to the water pipe without any.

  In addition, the buried box set according to the present invention has an effect that it is possible to provide a buried box having the sediment inflow preventing plate for the buried box.

  Furthermore, the earth-and-sand inflow prevention structure of the buried box according to the present invention has an effect of appropriately preventing the earth and sand from flowing into the buried box.

  And the attachment method of the earth and sand inflow prevention board for buried boxes concerning this invention has an effect which can attach the earth and sand inflow prevention board for buried boxes quickly to a water pipe.

It is an external appearance perspective view which shows the earth and sand inflow prevention board for burial boxes of Example 1. FIG. The earth and sand inflow prevention board for embedding boxes of Example 1 is shown, (a) is a front view, (b) is a right side view, and (c) is a rear view. (A) is a perspective view which shows the burying box and water pipe concerning Example 1, (b) is a perspective view which shows the earth and sand inflow prevention structure of the burying box concerning Example 1. FIG. It is explanatory drawing which shows the process in which the earth and sand inflow prevention board for burial boxes concerning Example 1 is attached to a water pipe. The earth and sand inflow prevention board for embedding boxes of Example 2 is shown, (a) is a front view, (b) is a right side view, and (c) is a rear view. It is explanatory drawing which shows the process in which the earth and sand inflow prevention board for burial boxes concerning Example 2 is attached to a water pipe. (A) is a fragmentary sectional side view of the elastic tongue piece part in the earth and sand inflow prevention board for burial boxes of Example 1, (b) is the elastic tongue piece part in the earth and sand inflow prevention board for burial boxes of Example 3. FIG. It is a fragmentary sectional side view of the elastic tongue piece part concerning a modification. It is explanatory drawing which shows the other sediment inflow prevention structure.

  Hereinafter, embodiments embodying the method for attaching a sediment inflow prevention plate for a buried box, a buried box set, a sediment inflow prevention structure for a buried box, and a method for attaching a sediment inflow prevention plate for a buried box according to the present invention will be described in detail. In addition, the earth-and-sand flow prevention plate for buried boxes of this invention is not limited to the earth-and-sand flow prevention plates 1-3 for a buried box shown below, and a design change is possible suitably.

[Example 1]
As shown in FIGS. 1 and 2, the earth and sand inflow preventing plate 1 for a buried box includes a flat plate-shaped substrate portion 20. The substrate part 20 in the present embodiment has a square plate shape, the vertical length is 125 mm, the horizontal length is 110 mm, and the plate thickness is 2 mm. The four corners are chamfered with R20.

  In addition, a water pipe arrangement hole 21 having a circular shape with an inner diameter of 10 mm is formed in a substantially central portion of the substrate part 20 in a penetrating manner along the thickness direction of the substrate part 20. In addition, a water pipe passage slit portion 22 that connects the outer edge of the substrate portion 20 and the water pipe arrangement hole 21 is formed in the substrate portion 20. The water pipe passage slit portion 22 is formed in a penetrating shape along the thickness direction of the substrate portion 20, and is formed in a streak shape along the vertical side of the substrate portion 20. The slit width of the water pipe passage slit portion 22 is 1 mm.

  With this configuration, the substrate portion 20 is partially divided into a first substrate portion dividing portion 20a on one side and a second substrate portion dividing portion 20b on the other side based on the water pipe passage slit portion 22. .

  Furthermore, a plate-shaped and tapered elastic tongue piece 25 is provided from the peripheral portion toward the water pipe arrangement hole 21 in the peripheral part surrounding the water pipe arrangement hole 21 in the substrate part 20. A plurality (20 in this embodiment) are formed radially around the tube placement hole 21. The elastic tongue pieces 25 are adjacent to each other with a small interval.

  In addition, as shown in FIGS. 1 and 2B and the like, the elastic tongue piece portion 25 extends along the thickness direction of the substrate portion 20 toward the water pipe arrangement hole portion 21 arranged on the distal end side. Curved to one side.

  Further, in the base portion which is the base end of the elastic tongue pieces 25 adjacent to each other in the base plate portion 20, cutout portions 27 each having a round hole shape having an inner diameter larger than the separation distance between the elastic tongue pieces 25 are respectively penetrating. Is formed.

  Furthermore, inclined edge portions 31 and 32 that are inclined toward the water pipe passage slit portion 22 are formed on the outer edge portion of the substrate portion 20 that is continuous with the water pipe passage slit portion 22. Specifically, the first inclined edge portion 31 is formed in the first substrate portion dividing portion 20a, and the second inclined edge portion 32 is formed in the second substrate portion dividing portion 20b.

  Next, according to FIGS. 3 and 4, a method for attaching the earth and sand inflow prevention plate 1 for a buried box is described in detail.

  As shown in FIG. 3 (a), water pipe insertion holes 16 are provided on the left and right side surfaces of the buried box 15 in which devices such as water meters and / or stopcocks are accommodated, respectively. In a state where the burying box 15 is buried at a predetermined position, the water pipe P is inserted into the water pipe insertion hole 16.

  Then, with the distal end portion of the elastic tongue portion 25 in the buried box earth and sand inflow prevention plate 1 facing the water pipe insertion hole 16 of the buried box 15, as shown in FIG. The first substrate portion dividing portion 20a and the second substrate portion dividing of the substrate portion 20 are brought into pressure contact with the inclined edges 31 and 32 formed on the substrate portion 20 of the buried box sediment inflow prevention plate 1 against the outer peripheral surface. The parts 20b are separated from each other along the pipe axis of the water pipe P, and the water pipe P is guided to the slit 22 for passing the water pipe. Next, after passing the water pipe P through the water pipe passage slit 22, each elastic tongue piece 25 is elastically deformed by the water pipe P as shown in FIG. The water pipe P is arranged in the water pipe arrangement hole 21 while spreading 21. Here, the minimum hole diameter D1 (see FIG. 2) of the water pipe arrangement hole 21 at the tip of the elastic tongue piece 25 is arranged at the position of the water pipe arrangement hole 21 at the tip of the elastic tongue piece 25. The diameter is smaller than the outer diameter D2 (see FIG. 4) of the water pipe P.

  And it is set as the state which coat | covered the water pipe penetration hole 16 from the outer side of the burying box 15 with the sediment inflow prevention board 1 for burying boxes. Thereby, the earth and sand inflow prevention structure 10 of the burying box 15 can be constructed. In addition, it is not necessary to adjust the length of the elastic tongue piece portion 25 in advance in correspondence with the outer diameter of the water pipe P in the step of attaching the earth and sand inflow prevention plate 1 for the buried box to the water pipe P.

  Thus, in the state where the earth and sand inflow prevention plate 1 for the burying box is attached to the water pipe P, the elastic tongue piece 25 is in a state of elastic contact with the water pipe P. Therefore, in the circumferential direction of the water pipe P, a gap is less likely to be generated between the outer peripheral surface of the water pipe P and the elastic tongue piece 25, and the inflow of earth and sand into the buried box 15 is suppressed. In addition, since the elastic tongue piece 25 and the water pipe P are in contact with each other in a state where the direction in which the tip of the elastic tongue piece 25 faces and the pipe axis direction of the water pipe P substantially coincide with each other, the elastic tongue piece portion The length of 25 does not have to correspond exactly to the outer diameter of the water pipe P. Moreover, since the front-end | tip part of each elastic tongue piece part 25 each contact | abuts uniformly with respect to the outer peripheral surface of the water pipe P, when attaching the earth-and-sand inflow prevention board 1 for buried boxes to the water pipe P, the board | substrate part 20 twists. There is no end.

  In addition, since the notch part 27 is formed in the root part of the elastic tongue piece part 25 as described above, the elastic tongue piece part 25 can be easily elastically deformed from the root part, and the root part is broken by shear stress. Can be suitably prevented.

  Moreover, since the inclined edge parts 31 and 32 which guide the water pipe P to the slit part 22 for water pipe passage are formed in the outer edge part of the board | substrate part 20, the inclined edge part 31 and 32 are formed in the outer peripheral surface of the water pipe P. The water pipe P can be smoothly arranged in the water pipe passage slit portion 22 while following 32.

  Further, when a single buried box 15 and a required number of buried box earth and sand inflow prevention plates 1 are used as a buried box set, the buried box 15 that can prevent the inflow of earth and sand can be quickly installed at the construction site. Can be prepared and installed.

[Example 2]
Next, the earth and sand inflow preventing plate 2 for a buried box according to another embodiment will be described with reference to FIG.

  As shown in FIG. 5, in the earth and sand inflow prevention plate 2 for the burying box, the first water pipe guide portion 33 is located at a portion facing the water pipe passage slit portion 22 in the outer edge portion of the first substrate portion dividing portion 20 a. Is provided. The first water pipe guide portion 33 has a curved shape that slightly warps to one side with respect to the substrate portion 20, and a first inclined surface 35 that is inclined in one direction along the thickness direction of the substrate portion 20 is formed. Has been.

  On the other hand, the 2nd water pipe guide part 34 is provided in the site | part which faces the water pipe passage slit part 22 in the outer edge part of the 2nd board | substrate part division | segmentation part 20b. The second water pipe guide portion 34 has a curved shape that slightly warps to the other side with respect to the substrate portion 20, and a second inclined surface 36 that is inclined to the other along the thickness direction of the substrate portion 20 is formed. ing.

  In such a configuration, as shown in FIG. 6, the substrate portion dividing portions 20 a and 20 b are different from each other while the inclined surfaces 35 and 36 of the water pipe guide portions 33 and 34 are pressed against the outer peripheral surface of the water pipe P, respectively. The water pipe passage slit portion 22 can be smoothly opened.

  In the embodiments described so far, the dimensional shape of each part can be freely set as appropriate.

  Moreover, in the earth-and-sand inflow prevention plate 1 for burial boxes concerning Example 1, as shown to Fig.7 (a), the plate | board thickness of the elastic tongue piece part 25 may be set as the structure thinner than the plate | board thickness of the board | substrate part 20. FIG. preferable. By adopting such a configuration, the elastic tongue piece 25 can be easily elastically deformed even if the thickness of the substrate portion 20 is increased in terms of securing strength.

  On the other hand, it is good also as the earth-and-sand inflow prevention board 3 for embedded boxes concerning Example 3 as shown in FIG.7 (b). More specifically, in this embodiment, the plate thickness of the elastic tongue piece 45 and the plate thickness of the substrate unit 20 are the same. With this configuration, there is an advantage that the structure of the earth and sand inflow prevention plate 3 for the buried box is simplified and the manufacturing cost is reduced.

  In addition, it is desirable that the earth and sand inflow prevention plates 1 to 3 for the buried box are made of a flexible synthetic resin such as recycled polypropylene (R-PP).

  Further, as shown in FIG. 8, in the buried box sediment inflow prevention plate 4 according to the modified example, the elastic tongue piece 55 has a plate thickness (outside dimension in a direction perpendicular to the insertion direction) toward the tip. Has a structure of thinning. By setting it as this structure, the front-end | tip of the elastic tongue piece part 55 becomes easy to elastically deform, and it becomes easy to follow the shape of the water pipe P. FIG. Note that the elastic tongue pieces 25, 45, and 55 described so far are not limited to plate shapes, and may have a circular shape, a polygonal shape, an irregular shape, or the like in cross section.

  Further, as shown in FIG. 9, in the other earth and sand inflow prevention structure 11, the direction in which the earth and sand is about to flow in and the direction in which the curved elastic tongue piece 25 is pushed out are opposed to each other. A plate 1 can be arranged.

  Specifically, when the earth and sand inflow prevention plate 1 for a buried box is attached to the water pipe P, the tip of the elastic tongue piece 25 is directed to the side opposite to the water pipe insertion hole 16 of the buried box 15. Above, the water pipe P is passed through the slit 21 for water pipe passage. By adopting such a configuration, it is possible to construct the earth and sand inflow prevention structure 11 in which earth and sand hardly flow into the buried box 15.

1-3 Sediment inflow prevention plate for buried box 10, 11 Sediment inflow prevention structure 15 for buried box 15 Embedded box 16 Water pipe insertion hole 20 Substrate part 21 Water pipe arrangement hole part 22 Water pipe passage slit part 25, 45 , 55 Elastic tongue piece 27 Notch 31 First inclined edge 32 Second inclined edge P Water pipe

Claims (9)

By being attached to a water pipe inserted into a water pipe insertion hole provided in a buried box embedded in a predetermined position, the water pipe insertion hole is covered from the outside of the buried box, A sewage inflow prevention plate for a buried box that prevents sediment from flowing into the burying box through the water pipe insertion hole;
A substrate section;
A water pipe arrangement hole, in which the water pipe is arranged, is formed in the substrate portion in a penetrating manner,
From the outer edge of the substrate part to the water pipe arrangement hole, the water pipe passage slit part formed in the substrate part in a penetrating manner,
Comprising
In the peripheral part surrounding the water pipe arrangement hole in the substrate part, an elastic tongue piece is formed that is extended from the peripheral part toward the water pipe arrangement hole.
Further, the elastic tongue piece is
In the state where the water pipe is not arranged in the water pipe arrangement hole, it is curved to one side so as to follow the plate thickness direction of the substrate part toward the water pipe arrangement hole,
Sediment inflow prevention plate for buried box, wherein the water pipe is elastically contacted with the water pipe in a state where the water pipe is arranged in the water pipe arrangement hole through the water pipe passage slit. . The earth and sand inflow for buried boxes according to claim 1, wherein an inclined edge portion that is inclined toward the water pipe passage slit portion is formed at an outer edge portion of the base plate portion continuous with the water pipe passage slit portion. Prevention plate. 3. The buried box earth and sand according to claim 1, wherein the elastic tongue piece portion has a plate piece shape, and the elastic tongue piece portion includes at least a portion where the plate thickness is thinner than the plate thickness of the substrate portion. Inflow prevention plate. A plurality of the elastic tongue pieces are radially formed around the water pipe arrangement hole, and the base of the elastic tongue pieces has an inner diameter larger than the separation distance between the elastic tongue pieces. The earth and sand inflow prevention plate for buried boxes according to any one of claims 1 to 3, wherein a cutout portion having a round hole shape is formed. The earth and sand for an embedded box according to any one of claims 1 to 4, wherein the elastic tongue portion has an outer dimension that is smaller in a direction perpendicular to a direction in which the elastic tongue piece is inserted toward the tip. Inflow prevention plate. The earth and sand inflow prevention plate for buried boxes according to any one of claims 1 to 5,
A buried box in which the inflow of earth and sand is prevented by the earth and sand inflow prevention plate for the buried box;
An embedded box set characterized by including The buried-box earth-and-sand inflow prevention plate according to any one of claims 1 to 5, wherein the elastic tongue piece portion is arranged so as to bend to the side opposite to the buried box side. Sediment inflow prevention structure for buried boxes. It is the attachment method of the earth and sand inflow prevention board for burial boxes of any one of Claims 1 thru / or 5, Comprising:
Including the step of placing the water pipe in the water pipe placement hole by passing the water pipe through the water pipe passage slit, and elastically contacting the elastic tongue piece to the water pipe. The installation method of the earth and sand inflow prevention board for a buried box characterized by the above. By being attached to a water pipe inserted into a water pipe insertion hole provided in a buried box embedded in a predetermined position, the water pipe insertion hole is covered from the outside of the buried box, A buried box earth and sand inflow prevention plate for preventing earth and sand from flowing into the buried box through the water pipe insertion hole,
A substrate section;
A water pipe arrangement hole, in which the water pipe is arranged, is formed in the substrate portion in a penetrating manner,
From the outer edge of the substrate part to the water pipe arrangement hole, the water pipe passage slit part formed in the substrate part in a penetrating manner,
Comprising
In the peripheral part surrounding the water pipe arrangement hole in the substrate part, an elastic tongue piece is formed that is extended from the peripheral part toward the water pipe arrangement hole.
Further, the elastic tongue piece is
In the state where the water pipe is not arranged in the water pipe arrangement hole, it is curved to one side so as to follow the plate thickness direction of the substrate part toward the water pipe arrangement hole,
And the minimum hole diameter of the hole for water pipe arrangement | positioning in the front-end | tip of the said elastic tongue piece state in which the said water pipe is not arrange | positioned in the said water pipe arrangement | positioning hole part is the said water pipe in the front-end | tip of the said elastic tongue piece part. An earth and sand inflow prevention plate for a buried box, characterized in that the diameter is smaller than the outer diameter of a water pipe arranged at the position of the arrangement hole.

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