JP2005290969A - Protective cover for water line gate valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a protective cover for a water line sluice valve capable of coping with the shape of different water line gate valves for every bore of a water pipe and every manufacturer and preventing the inflow of underground water or the like, and furthermore facilitating inspection at night. <P>SOLUTION: A rubber cover 300 fitted to the inner peripheral surface 41 of a concrete box 40 is mounted to the outer peripheral surface upper part of the protective cover 200 made of synthetic resin and inserted in the concrete box 40, and the upper end of the protective cover 200 is provided with an openable/closable lid 400. A soft member 500 brought into close contact with the water line sluice valve 50 to hold the inside of a cylinder in a sealed state is interposed at the inner peripheral surface lower part of the protective cover 200. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement in a protective cover for a water gate valve of a water pipe buried under a road.

  As shown in Japanese Patent Application Laid-Open No. 2002-138523 (Patent Document 1), the present inventor changes the concrete box to a shallow buried type so as to increase the distance between the concrete box bottom plate and the shallowly buried water pipe. In order to reduce the influence of the load of vehicles on the road, and prevent the occurrence of water leakage from the joints of the water pipe, etc., and provide a protective cover made of synthetic resin inserted in the concrete box, Although the upper part of the flange of the water gate valve can be protected from rain water and earth and sand, and the concrete box is not displaced due to an earthquake or the like, the main body of the water gate valve has a diameter of 50 mm, 75 mm, 100 mm. The shape increases corresponding to millimeters, 150 millimeters, 200 millimeters, 250 millimeters, etc. There is a difference in shape by the manufacturer, the problem can not support occurs in a protective cover made of a certain size of the synthetic resin. Therefore, the inventor succeeded in developing a protective cover made of a synthetic resin of a certain size that can be applied to a wide range of water gate valves, and succeeded in developing a protective cover that can be easily inspected at night. . Regarding this improved invention, a patent application has been filed for a protective cover for a water gate valve, characterized in that the water gate valve is fitted with a protective cover having a cylindrical portion and a lower portion extending from the end (Japanese Patent Application No. 2004-63760). .

  In addition, the present inventor shall further improve the protective cover of the water gate valve that has been developed so far and completely prevent inflow of earth and sand and groundwater from the road surface in order to strengthen the protection of the water gate valve. For this purpose, we have also succeeded in developing a protective cover that can keep the inside of the cylinder sealed.

JP 2002-138523 A

  The specific problem to be solved by the present invention is to provide a protective cover for the water gate valve that can cope with the diameter of the water pipe and the shape of the water gate valve that is different for each manufacturer, and to prevent the inflow of groundwater, etc. It is another object of the present invention to provide a protective cover for a water gate valve that can be used, and to provide a protective cover for a water gate valve that can be easily inspected at night.

  The present invention provides a protective cover for a water gate valve that is less likely to receive a load on a road surface and does not cause a displacement of a concrete box due to an earthquake or the like even if the water gate valve and the water pipe are buried shallowly. It has a technical relationship with which a group of inventions are related.

In order to achieve the above object, the protective cover of the water gate valve according to the present invention is characterized in that the invention according to claim 6 is arranged on the inner peripheral surface of the concrete box on the outer peripheral surface of the synthetic resin cylinder inserted into the concrete box. In the protective cover of the water gate valve, the first rubber hat fitted to the surface is attached, and the second rubber hat fitted to the flange cover of the water gate valve is fixed to the lower part of the inner peripheral surface of the synthetic resin cylinder. A cylindrical portion below the second rubber hat of the cylinder is formed in a divergent shape so that a water gate valve can be inserted.
By cutting out the opposing surface of the lower cylindrical portion in a strait-like shape, it becomes possible to fit a wide range of product gate valves, and it is preferable to protect the cut edge with a rubber cover.

In order to achieve the above object, a protective cover for a water gate valve according to the present invention is characterized in that the invention according to claim 1 is arranged such that an inner periphery of the concrete box is formed on an outer peripheral surface of a synthetic resin cylinder inserted in a concrete box. A rubber cover to be fitted to the surface is attached so as to be freely mounted, and an openable / closable lid is provided at the upper end portion of the synthetic resin cylinder, and the lower part of the inner peripheral surface of the synthetic resin cylinder is brought into close contact with the water gate valve and the inside of the cylinder Is interposed with a soft member that keeps it in a sealed state.
The invention according to claim 2 is the invention according to claim 1, wherein the flexible member is fixed to a flange portion of a water gate valve or a peripheral portion thereof, and is fixed to the first fixing portion. A height adjusting portion arranged above the fixed portion and formed in a bellows shape, and fixed by being fitted to a joint portion between the main body portion and the lower portion of the synthetic resin cylinder arranged above the height adjusting portion. And a second fixed portion.
According to a third aspect of the present invention, in the first aspect of the present invention, the flexible member is formed into a bag shape by processing a material having flexibility such as rubber or a soft vinyl chloride resin.
According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the synthetic resin cylinder is formed such that the upper diameter of the synthetic resin cylinder is smaller than the diameter of the opening of the concrete box. An openable / closable lid provided at the upper end of the door is easily taken out from the outside.
According to a fifth aspect of the present invention, in the first to fourth aspects of the invention, the lower cylindrical portion of the synthetic resin cylinder is formed in a divergent shape.

  In order to achieve the above object, a protective cover for a water gate valve according to the present invention provides the invention described in claim 7, wherein the inner peripheral surface of the synthetic resin cylinder is white in the invention described in claims 1 to 6. It is a light reflection color or fluorescent color that facilitates nighttime inspection.

  According to the present invention, even if the water pipe and the water gate valve are buried together with the shallow concrete box, the distance between the concrete box bottom plate and the water pipe can be increased by inserting the protective cover to the concrete box. The load on the road surface does not act on the water gate valve or water pipe by the protective cover, and also provides many advantages such as easy outflow of rainwater and collection of earth and sand, and the protective cover of the present invention. By adjusting the tube length, the embedment depth can be changed freely, and the concrete box itself can be used with only one or two steps, and can be installed even in narrow places.

  Further, according to the invention described in claim 6, by forming the lower part of the protective cover of a certain size in a divergent shape, it can be used in a wide range of water pipe diameters, for example, a concrete box 25 like a conventional one. It is no longer necessary to use different types such as molds and 32 types, and for example, it is possible to use anything with a small concrete inner diameter such as the 25 type type, and economical construction is possible. The reason for this was that as the water gate valve became larger, a concrete box with a diameter corresponding to the inner diameter of the concrete box was used. If the lower part of the protective cover was widened, the upper part had a diameter of 200 mm, for example. Even so, the lower part of the end spread can be expanded to an inner diameter of 250 mm or more.

  Further, according to the first to fifth aspects of the invention, the upper end of the synthetic resin cylinder is provided with an openable / closable lid, and the lower part of the inner peripheral surface of the synthetic resin cylinder is brought into close contact with the water gate valve so that the inside of the cylinder By interposing a flexible member that keeps the watertight in a sealed state, it is possible to prevent the inflow of earth and sand from the road surface and to prevent the inflow of groundwater completely in order to strengthen the protection of the water gate valve. In addition, for example, it becomes possible to solve problems such as the water gate valve being buried with earth and sand or groundwater in the event of a disaster, making it difficult to work. A protective cover can be provided. Moreover, since the construction method is as simple as the protective cover for a series of water gate valves developed by the present inventors, economical construction has become possible.

  According to the seventh aspect of the invention, since the inner peripheral surface of the synthetic resin cylinder is white, light-reflecting color or fluorescent color, nighttime inspection is facilitated and workability can be improved. It was.

A protective cover of a water gate valve for achieving a specific problem of the present invention (providing a protective cover of a water gate valve that can cope with the diameter of the water pipe and the shape of the water gate valve that differs for each manufacturer) The main feature is that the water gate valve is fitted with a protective cover with the part and the lower part spread out. Hereinafter, the protective cover of this water gate valve will be described in Examples 1 and 2.
Moreover, the protection cover of the water gate valve for achieving the specific subject (providing the protective cover of the water gate valve which can prevent inflow of groundwater etc.) of this invention is the inside of a cylinder being sealed. The main feature is that it is provided with a lid to be held and a soft member. Hereinafter, the protective cover for the water gate valve will be described in Example 3.
In addition, the protection cover of the water gate valve described in Examples 1 to 3 can employ a material such as cast iron instead of synthetic resin in consideration of recycling problems and economy. In addition, the concrete box can be attached as long as it has a predetermined inner peripheral diameter, and may be formed of resin concrete or the like.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 4 and FIG.
The protective cover of the water gate valve of the present embodiment includes a synthetic resin end-spreading cylinder 10, a first rubber hat 20, and a second rubber hat 30.
The synthetic resin end-spreading cylinder 10 includes a cylindrical portion 100 made of a known synthetic resin such as a hard vinyl chloride resin whose peripheral surface is white-coated or fluorescent-coated, and a end-spreading portion 101. The second rubber hat 30 is described later. The divergent portion 101 below the mounting position needs to be large enough to fit the upper portion of the water gate valve 50 and the flange 511, and the divergent portion 101 may be a deformed socket as shown in FIGS.
It is preferable that the holes 102 and 102 cut out of the divergent portion 101 are externally fitted to the cut edges 1021 and 1021 with rubber covers 1022 and 1022.
Further, as shown in FIGS. 3 and 4, the divergent portion 101 is preferably provided with notches 103 and 103 when a hook 512 for installing or replacing the water gate valve 50 is provided.
As shown in FIG. 7, the first rubber hat 20 has a flanged short cylindrical portion 21 attached so as to be fitted and fixed to the upper portion of the outer peripheral surface 11 of the synthetic resin cylinder 10, and a flexible connecting at the lower end thereof. This is a rubber washer edge 22 in the form of a washer that is bent down to the inner peripheral surface 41 of the concrete box so that the hat edge 221 can be fitted. An appropriate number of drains 23 are integrally formed with the hat edge 22, but are slightly shorter in the central direction than that, and a shallow groove is formed to allow drainage. Further, instead of the flanged short cylindrical portion 21, a U-shaped portion 21 </ b> B shown in FIG. 5 of JP-A-2002-138523 may be fitted and fixed to the upper end of the cylinder 10.
Further, as shown in FIG. 6 of JP-A No. 2002-138523, the first rubber hat has notches formed in the short cylindrical portion 21 or the U-shaped portion 21B, the flexible washer-like rubber hat edge 22 and the hat edge 211. 20B which consists of the provided drainage 23B may be sufficient.
As shown in FIGS. 1, 7 and 8 of JP-A No. 2002-138523, the second rubber hat 30 includes a short cylindrical portion 31 which is fitted and fixed to the lower portion of the inner peripheral surface 12 of the synthetic resin cylinder 10; It consists of a disc-shaped rubber hat edge 32 with a drain hole (not shown) provided continuously at its lower end. The rubber hat edge 32 is provided with an opening 33, and the opening 33 is fitted to the outer shape of the flange cover 51 of the water gate valve 50, and the rubber hat edge 32 is bent up from the opening 33 along the flange cover 51. It adheres by.
Therefore, when embedding the water pipe 60 and the water gate valve 50, as shown in FIGS. 3 and 4, the synthetic resin end spread cylinder 10 is inserted so as to straddle the water pipe 60 and the concrete box 40 is installed. In this case, the first rubber hat 20 attached to the upper part of the outer peripheral surface 11 of the cylinder 10 is fitted to the inner peripheral surface 41 of the concrete box 40 and is attached to the lower part of the inner peripheral surface 12 of the cylinder 10. The rubber hat 30 can be fitted to the flange cover 51 of the water gate valve 50.
In this case, the distance between the concrete box bottom plate 42 and the water pipe 60 can be easily finely adjusted because the first rubber hat 20 can freely move and fit on the inner peripheral surface of the concrete box 40.
Moreover, since the lightweight synthetic resin end-spreading cylinder 10 is inserted into the concrete box 40, the load acting on the road surface does not act on the cylinder 10, so that no burden is placed on the water gate valve 50 or the water pipe 60. It does not take.
The water flowing in from the road flows out into the earth and sand 70 from the drain 23 or 23B of the first rubber hat, and flows out into the earth and sand 70 from the drain hole of the second rubber hat 30. In addition, most of the earth and sand flowing in from the road is collected on the first rubber hat 20 and the second rubber hat 30 and may be collected periodically.
Further, in the embodiment of the present invention, if the diameter of the divergent portion 101 is 250 mm, the range of the water pipe diameter of 200 mm or less can be used in the divergent cylinder 10.

A second embodiment of the present invention will be described with reference to FIGS.
The protective cover of the water gate valve according to the present embodiment includes a synthetic resin end-spreading cylinder 10 </ b> B, a first rubber hat 20, and a second rubber hat 30.
The synthetic resin end-spreading cylinder 10B is composed of a cylindrical portion 100B made of a known synthetic resin such as hard vinyl chloride resin whose peripheral surface is painted in white or fluorescent color, and a end-spreading portion 101B. The divergent portion 101B below the attachment position needs to be large enough to fit the flange 511B for the gate valve cover 51B, and the divergent portion 101B is integrally formed below the cylinder 10B.
Since the 1st rubber hat 20 and the 2nd rubber hat 30 are the same as that of Example 1, detailed explanation is omitted.
Therefore, when embedding the water pipe 60 and the water gate valve 50B, the concrete resin end spread cylinder 10B is inserted so as to straddle the water pipe 60 as shown in FIGS. 5 and 6, and the concrete box 40 is installed. In this case, the first rubber hat 20 attached to the upper portion of the outer peripheral surface 11B of the cylinder 10B is fitted to the inner peripheral surface 41 of the concrete box 40, and is attached to the lower portion of the inner peripheral surface 12B of the cylinder 10B. The rubber hat 30 can be fitted to the flange cover 51B of the water gate valve 50B.

A third embodiment of the present invention will be described with reference to FIGS.
The protective cover for the water gate valve of the present embodiment is attached to the outer peripheral surface of the cylindrical main body 210 and the protective cover 200 in which the cylindrical lower part 220 and the cylindrical upper part 230 are inserted and connected to the cylindrical main part 210 made of synthetic resin. The rubber cover 300 is fitted to the inner peripheral surface 41 of the concrete box, the lid 400 is attached to the upper end of the cylindrical upper portion 230 so as to be openable and closable, and the water supply valve 50 is in close contact with the lower inner peripheral surface of the protective cover 200. And a flexible member 500 that holds the inside of the cylinder in a sealed state.
The cylindrical lower part 220 of the protective cover 200 can be formed in a divergent shape like the protective cover described in the first and second embodiments, and the overall structure of the protective cover 200 is a cylinder made of synthetic resin as shown in FIG. The main body 210 may be integrally formed separately from the type in which the cylindrical lower part 220 and the cylindrical upper part 230 are inserted. Moreover, it is preferable that the inner peripheral surface of the protective cover 200 is painted white or fluorescently to facilitate nighttime inspection.
As shown in FIG. 8, the rubber cover 300 includes a short cylindrical portion 310 that is fitted to the outer peripheral surface of a synthetic resin cylindrical main body 210 and is detachably mounted, and a flexible edge that is continuously provided at the upper end thereof. It consists of a part 320 and is bent down to the inner peripheral surface 41 of the concrete box so that the edge part 320 can be fitted. The rubber cover 300 is formed with a shallow groove-shaped drainage or notch (not shown, see FIGS. 2 and 6 of JP-A-2002-138523) on the edge 320 for draining rainwater or the like flowing from the road. Has been. The rubber cover 300 may be a flexible synthetic resin product instead of a rubber product.
The lid 400 is fitted to the upper end portion of the synthetic resin cylindrical upper portion 230 so as to be freely opened and closed, and the diameter of the upper end portion of the synthetic resin cylindrical upper portion 230 is smaller than the diameter of the opening 43 of the concrete box. By forming the cover, the openable / closable lid 400 can be easily taken out from the outside. As shown in FIG. 8, for example, a member having a diameter of 200 millimeters is employed for the cylindrical main body portion 210 and a member having a diameter of 150 millimeters is employed for the cylindrical upper portion 230, thereby reducing the upper end portion of the cylindrical upper portion 230. In this embodiment, a construction example in which the cylindrical upper portion 230 is attached to the outside of the cylindrical main body portion 210 is shown, but a cylindrical upper portion 230a (not shown) that is processed so as to be fitted inside the cylindrical main body portion 210 may be attached. Thus, when it constructs so that the whole cylindrical upper part 230a including the lid | cover 400 may be settled inside the cylindrical main-body part 210, since earth and sand accumulates on the lid | cover 400, collection | recovery of earth and sand becomes easy. When the diameter of the upper end portion of the cylindrical upper portion 230 of the synthetic resin cylinder is larger than the diameter of the opening 43 of the concrete box, there is a problem that it is difficult to take out the lid itself, but the lid itself The problem can be solved by forming a flexible material (soft plastic, soft vinyl chloride resin, rubber, etc.).
As shown in FIGS. 8 and 9, the flexible member 500 that keeps the inside of the cylinder of the protective cover 200 in a sealed state is in close contact with the flange 511 of the water gate valve 50, and the first fixing portion 510 is fixed. A height adjustment part 520 arranged above the fixing part 510 and formed in a bellows shape, and a joint between the cylindrical main body part 210 made of synthetic resin and the cylindrical lower part 220 arranged above the height adjustment part 520. And a second fixing portion 530 that is fixed.
The soft member 500 only needs to play a role as a so-called rubber cover for sealing, and is formed by processing a soft material such as rubber or soft vinyl chloride resin. Moreover, the whole structure of the flexible member 500 is not limited to the type which adheres and fixes to the flange 511 of the water gate valve 50 as shown in FIG.8 and FIG.9, and is a bag shape in the shape surrounding the water gate valve 50. What is necessary is just to be able to shape | mold and to maintain watertightness.
The first fixing portion 510 of the flexible member 500 has a flange portion of the water gate valve 50 corresponding to the diameter of the water pipe 60 of 50 millimeters, 75 millimeters, and 100 millimeters. 9 is formed in a shape in which the diameter gradually decreases downward as shown in FIG. 9, and three semicircular or triangular protrusions 515 are provided on the inner peripheral surface. . The semicircular or triangular projection 515 is fixed by biting into the flange 511 of the water gate valve 50. Here, with respect to the shape of the protrusion 515, an acute angle such as a triangular shape is easier to attach. Moreover, as shown in FIG. 10, you may strengthen attachment using the fixing band 516 made from stainless steel.
As shown in FIG. 9, the height adjustment part 520 of the flexible member 500 is disposed above the first fixing part 510 and formed in a bellows shape. Thereby, even when there is variation in the interval and positional relationship with the water gate valve 50 during construction, it is possible to cope with it.
As shown in FIG. 9, the second fixing portion 530 of the flexible member 500 is disposed above the height adjusting portion 520 and is fitted to the joint portion between the cylindrical main body portion 210 and the cylindrical lower portion 220 made of synthetic resin. The watertightness is maintained at the same time.
9 and 10, the second fixing portion 530 includes a U-shaped holding portion 531 formed by bending the upper end portion outward, and the holding portion 531 includes a cylindrical lower portion 220. The upper end is inserted. In addition, a plurality of hat-shaped or semi-circular protrusions 532 are provided on the outer peripheral surface of the outer portion of the sandwiching portion 531 so that the lower end portion of the cylindrical main body portion 210 can be easily inserted and the water tightness is improved. As shown in FIG. 9, a so-called inflatable rubber ring 533 that absorbs moisture and expands can be attached to the gap between the hat-shaped or semicircular protrusions 532. However, watertightness can be maintained without such an expanded rubber ring 533, but complete water stoppage is possible by attaching the expanded rubber ring 533.
The above describes the specific configuration of the flexible member 500 in the type in which the lower end portion of the cylindrical main body 210 is inserted outside the upper end portion of the cylindrical lower portion 220 with respect to the joint portion between the cylindrical main body portion 210 and the cylindrical lower portion 220. A specific configuration of another flexible member of a type in which the lower end portion of the cylindrical main body portion 211 is inserted inside the upper end portion of the cylindrical lower portion 220 will be described with reference to FIG.
As shown in FIG. 11, the flexible member 600 includes a first fixing portion 610 that is fixed in close contact with the flange 511 of the water gate valve 50, and a high bellows-like shape that is disposed above the first fixing portion 610. It is comprised from the height adjustment part 620 and the 2nd fixing | fixed part 630 which is arrange | positioned above the height adjustment part 620, and is fitted and fixed to the junction part of the cylindrical main-body part 211 made from a synthetic resin, and the cylindrical lower part 220. . Here, the first fixing unit 610 and the height adjusting unit 620 are the same as the first fixing unit 510 and the height adjusting unit 520 described above, and thus description thereof is omitted.
The second fixing portion 630 of the flexible member 600 is fixed by being fitted to the joint portion between the synthetic resin cylindrical main body 211 and the cylindrical lower portion 220 in the same manner as described above, and at the same time, the water tightness is maintained.
As shown in FIG. 11, the second fixing portion 630 includes a U-shaped sandwiching portion 631 formed by bending the upper end portion outward, and the upper end portion of the cylindrical lower portion 220 is inserted into the sandwiching portion 631. It is supposed to be. A plurality of hat-shaped or semi-circular protrusions 632 are provided on the inner peripheral surface and the outer peripheral surface of the inner portion of the holding portion 631. The lower end of the cylindrical main body 211 is inserted along a hat-shaped or semi-circular protrusion 632 provided on the inner peripheral surface of the inner side of the holding portion 631.
As described above, the protective cover of the water gate valve of the present embodiment includes the lid 400 that can be opened and closed at the upper end of the synthetic resin protective cover 200, and the water gate valve 50 is provided at the lower part of the inner peripheral surface of the protective cover 200. By interposing the soft members 500 and 600 that are in close contact to keep the inside of the cylinder in a sealed state, it is possible to prevent the inflow of earth and sand from the road surface and to completely prevent the inflow of groundwater. It is possible to strengthen the protection of
The flexible members 500 and 600 may be any member that has a role of keeping the inside of the cylinder in a sealed state by being in close contact with the water gate valve 50, and thus, the first fixing portions 510 and 610, second described above. About the shape and structure of the fixing | fixed part 530 * 630, it can change suitably according to the kind, shape, structure, etc. of a protective cover of a water gate valve and a water gate valve. For example, it is conceivable to attach the protective cover of the water gate valve and the water gate valve using an adhesive means. Further, if another configuration capable of maintaining watertightness is employed, the shape and structure of the above-described sandwiching portions 531 and 631 can be simplified.

  The protective cover of the water gate valve of the present invention can be mass-produced at low cost.

It is a perspective view of the protective cover which shows Example 1 of this invention. It is an expanded sectional view of the rubber cover used for FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is whole explanatory drawing of Example 1 of this invention. It is another whole explanatory drawing of Example 1 of this invention. It is whole explanatory drawing of Example 2 of this invention. It is another whole explanatory drawing of Example 2 of this invention. It is a fragmentary sectional view of the 1st rubber hat used for FIG. It is whole explanatory drawing of Example 3 of this invention. It is a cross-sectional explanatory drawing of the flexible member used for FIG. It is a partial cross-section explanatory drawing which shows the state which attached the soft member which hold | maintains the inside of a synthetic resin cylinder in the airtight state. It is another partial cross-section explanatory drawing which shows the state which attached the soft member which hold | maintains the inside of a synthetic resin cylinder in the airtight state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 10B Protective cover 100, 100B Cylindrical part 101, 101B End spreading part 11, 11B Outer peripheral surface 12 of a cylindrical part, 12B Inner peripheral surface 20 of a cylindrical part 1st rubber hat 30 2nd rubber hat 40 Concrete box 41 Inner peripheral surface of concrete box 43 Concrete box opening 50, 50B Water gate valve 51, 51B Water gate valve flange cover 60 Water pipe 200 Protective cover 210 Cylindrical body portion 220 Cylindrical lower portion 230 Cylindrical upper portion 300 Rubber cover 400 Lid 500, 600 Soft member

Claims (7)

A rubber cover that fits on the inner peripheral surface of the concrete box is attached to the upper portion of the outer peripheral surface of the synthetic resin cylinder inserted into the concrete box, and an openable / closable lid is provided at the upper end of the synthetic resin cylinder. A protective cover for a water gate valve, characterized in that a soft member is provided in close contact with the water gate valve at the lower part of the inner peripheral surface of the synthetic resin cylinder so as to keep the inside of the cylinder in a sealed state. The flexible member is a first fixing portion that is fixed in close contact with the flange portion of the water gate valve or its peripheral portion, a height adjusting portion that is disposed above the first fixing portion and formed in a bellows shape, 2. A second fixing portion that is disposed above the height adjusting portion and is fixed to a joint portion between a main body portion and a lower portion of the synthetic resin cylinder. Protective cover for water gate valve. 2. The protective cover for a water gate valve according to claim 1, wherein the soft member is formed into a bag shape by processing a material having flexibility such as rubber or soft vinyl chloride resin. The diameter of the upper part of the synthetic resin cylinder is formed smaller than the diameter of the opening of the concrete box, and the openable / closable cover provided at the upper end of the synthetic resin cylinder is easily removed from the outside. Item 4. A protective cover for a water gate valve according to any one of Items 1 to 3. The protective cover for a water gate valve according to any one of claims 1 to 4, wherein a cylindrical portion of the lower part of the synthetic resin cylinder is formed in a divergent shape. A first rubber hat fitted to the inner peripheral surface of the concrete box is attached to the upper portion of the outer peripheral surface of the synthetic resin cylinder inserted into the concrete box, and a flange of the water gate valve is attached to the lower portion of the inner peripheral surface of the synthetic resin cylinder. In the protective cover of the water gate valve to which the second rubber hat fitted to the cover is fixed, the cylindrical portion below the second rubber hat of the synthetic resin cylinder is formed in a divergent shape so that the water gate valve can be fitted. A protective cover for water gate valves. 7. The protective cover for a water gate valve according to claim 1, wherein an inner peripheral surface of the synthetic resin cylinder is white to light reflecting color or fluorescent color to facilitate nighttime inspection.

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