JP6523380B2 - Human hole lid - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a human-hole cover for opening and closing an entrance formed in the upper wall of a water storage tank, and more particularly to improvement of the ventilation structure.

  Conventionally, as an example of using a water storage tank, it may be buried in the ground instead of a reservoir for water supply or emergency in order to cope with a short-term fluctuation of water consumption. Such a water storage tank is provided with an entrance through which a person can enter and exit, and a human-hole cover through which the entrance can be opened and closed in order to carry out periodic inspection and cleaning of the inside. Furthermore, it has a ventilating mechanism that communicates the inside of the water storage tank to the outside.

  The applicant of the present invention has developed and filed a patent application for a human-hole lid having a ventilating function instead of providing an independent ventilating mechanism in such a water storage tank (Patent Document 1). FIG. 11 shows a human-hole lid described in Patent Document 1, which is a first cylindrical body 101 fixed to the upper wall 100 of the water storage tank, and a lid main body 103 for opening and closing the upper end opening of the first cylindrical body 101. And a second cylindrical body 102 formed on the outer peripheral edge of the lid body 103. Then, as the ventilation mechanism, the vent hole 105 is provided in the first cylindrical body 101, and a first gap is formed between the outer peripheral surface of the first cylindrical body 101 and the inner peripheral surface of the second cylindrical body 102. S1 is secured, and a second gap S2 is secured below the lower end of the second cylindrical body 102. That is, the inside of the water storage tank communicates with the outside in a ventilable manner via the inlet / outlet 110, the vent 105, the first gap S1 and the second gap S2. Furthermore, in order to prevent foreign matter such as insects from entering the water storage tank from the outside, the mesh plate 106 covering the vent hole 105 is integrally fixed to the first cylindrical body 101 by welding.

Unexamined-Japanese-Patent No. 7-247566 (patent 2550475) gazette.

  In the case cover of FIG. 11, since the mesh plate 106 covering the vent hole 105 is integrally fixed to the first cylindrical body 101 by welding, the mesh plate 106 is corroded, damaged or deteriorated. In this case, the entire human-hole cover has to be replaced, which increases the cost of replacement products or parts. That is, the maintenance cost of the water storage tank is increased. Moreover, since it is necessary to replace | exchange the whole human-hole cover, replacement work also takes time.

  In order to regularly clean the mesh plate 106 for clogging and the like, the mesh plate 106 needs to be fixed to the first tubular member 101 at the site, which takes time and effort.

  In particular, in a water storage tank installed outdoors, the mesh plate 106 is lower in strength and durability than the first and second cylindrical bodies 101 and 102 which are manufactured firmly from sheet metal or the like. Only 106 is often damaged in a short time. That is, although the first and second cylindrical bodies 101 and 102 do not need to be replaced, they must be exchanged wastefully together with the mesh plate 106.

  The object of the present invention is to replace only the mesh plate or to remove only the mesh plate so that it can be cleaned if the mesh plate covering the air vents is corroded, damaged or deteriorated. The object of the present invention is to reduce the maintenance cost of the human-hole lid and to facilitate replacement work and cleaning work.

  In order to solve the above-mentioned problems, the present invention is arranged at the entrance of the upper wall of a water storage tank, and covers a first cylindrical body rising from the upper wall and a lid which covers the upper end opening of the first cylindrical body openably and closably. And a second cylindrical body formed on the outer peripheral edge of the lid body and securing a first gap between the outer peripheral surface of the first cylindrical body, and the first cylindrical An air vent is formed in the peripheral wall of the body, a second gap is secured below the second cylindrical body, and the inside of the water storage tank is outside through the air vent and the first and second gaps. And a mesh plate separate from the first cylindrical body, and the mesh plate is detachably held at a position covering the vent by a holding means. .

  The present invention can preferably include the following configuration in addition to the configuration of the human-hole lid.

(A) The holding means holds the mesh plate on the inner peripheral surface side of the first cylindrical body.

(B) The holding means holds the mesh plate on the outer peripheral surface side of the first cylindrical body.

(C) The holding means is composed of a guide portion into which the mesh plate can be inserted from above and a stopper capable of locking the mesh plate at a position covering the vent. In this case, more preferably, the guide portion has a guide groove extending in the vertical direction, and the stopper has a stopper surface that abuts on the lower end of the mesh plate. Moreover, it is preferable that the said guide part is comprised by the angle member of cross-sectional L-shape.

(D) The first cylindrical body and the second cylindrical body are formed in a square shape in plan view, and four sheets of the same shape are formed on the four peripheral walls of the first cylindrical body. Each of the mesh boards is detachably disposed.

(1) According to the present invention, when the mesh plate of the vent hole is corroded, damaged or deteriorated, only the mesh plate can be removed from the first cylindrical body for replacement, so the product cost or parts at the time of replacement Cost can be reduced. That is, the maintenance cost can be reduced, and the replacement operation itself can be facilitated by only replacing the mesh board. In addition, since only the mesh plate can be removed to clean up clogging and the like, the cleaning operation can be facilitated.

(2) As in the case of the configuration requirement (a), when the mesh plate is held on the inner peripheral surface side of the first cylindrical body, when the lid main body is opened, work is performed on the holding portion of the mesh plate There is no concern that the members' shoes or tools come in contact from the outside, and the holding portion of the screen can be protected. In addition, the appearance when the lid body is opened can be maintained.

(3) As in the case of the configuration requirement (b), when the mesh plate is held on the outer peripheral surface side of the first cylindrical body, the inspection operation of the mesh plate and the holding state thereof is the first cylindrical shape. It can be done easily from the outside of the body and easy to carry out inspection work.

(4) If the guide and the stopper are provided as in the configuration requirement (c), the replacement work can be performed simply by pulling out the old screen and inserting the new screen from the top with the lid body open. As a result, the replacement of the screen can be done easily. In particular, since the mesh plate is held at a predetermined horizontal position and height by the guide groove of the guide portion and the stopper surface of the stopper, the new mesh plate can be easily and accurately held at the same predetermined position as the old mesh plate. Moreover, when an angle member is used as a guide part, processing of a guide part is also easy.

(5) As in the configuration (d), when the first tubular body is formed in a square shape in plan view, a common mesh board can be used for each peripheral wall, and management of replacement parts and replacement work are possible. It will be easier.

It is a side view of a water storage tank provided with a human-hole lid of a 1st embodiment of the present invention. It is the side view which expanded the man-hole cover of FIG. It is a top view of the human-hole cover of FIG. It is a front view of the human-hole cover of FIG. It is a top view of the human-hole cover of FIG. 2 shown in the state which opened the cover main body. FIG. 6 is an enlarged horizontal cross-sectional view of a portion indicated by arrow VI in FIG. 5; FIG. 7 is an enlarged view of a VII-VII cross section of FIG. 3; It is a perspective view of the 1st cylindrical body which shows the state at the time of replacement | exchange work of mesh board. 5 is a cross-sectional equivalent view of FIG. 5 showing a mesh board replacement work process, (a) before mesh board insertion, (b) in the middle of mesh board insertion, (c) in the state when mesh board insertion is completed It shows. FIG. 9 shows a second embodiment of the present invention, and is a perspective view similar to FIG. 8; It is a longitudinal cross-sectional view of a prior art example.

First Embodiment of the Invention
A first embodiment of the present invention will be described based on FIGS. 1 to 9. In FIG. 1, the water storage tank 1 is formed in a substantially rectangular parallelepiped shape by concrete, and is buried in the ground in a state where the upper wall 1a is exposed upward from the ground E. In the upper wall 1a, there is formed an entrance (manhole) 2 of a size that allows a person to enter and leave the water storage tank 1, and a human-hole cover 10 according to the present invention is disposed ing. The inner peripheral wall of the water storage tank 1 is provided with a plurality of steps 3 for the operator to ascend and descend.

  2 is an enlarged side view of the human-hole lid 10 of FIG. 1; the human-hole lid 10 is a base plate 11 horizontally fixed to the upper surface of the upper wall 1a of the water storage tank 1; The first cylindrical body 12 which vertically penetrates through the horizontal portion in the vertical direction, the lid main body 13 for opening and closing the upper end opening of the first cylindrical body 12, and the outer peripheral edge of the lid main body 13 And a second tubular body 15 which is formed and falls downward. The base plate 11, the first cylindrical body 12, the lid main body 13 and the second cylindrical body 15 are all made of metal, for example, stainless steel.

  The base plate 11 is fixed to the upper surface of the upper wall 1 a of the water storage tank 1 by four anchor bolts 20 and nuts 21. The first tubular body 12 is fixed to the base plate 11 by welding, and the lower end 12 b of the first tubular body 12 extends to the upper peripheral edge of the port 2 of the water storage tank 1. Further, the first tubular body 12 is connected to the anchor bolt 24 on the inner peripheral surface of the inlet / outlet 2 by the separation preventing chain 23. The second cylindrical body 15 surrounds the outer peripheral surface of the first cylindrical body 12 from the outside in the horizontal direction in a state where the lid main body 13 is closed. Further, one end of the second cylindrical body 15 in the horizontal direction is rotatably supported by the base plate 11 by the hinge mechanism 26, and the other end of the second cylindrical body 15 in the horizontal direction is It is locked in the closed position shown in FIG.

  The hinge mechanism 26 includes a support plate 27 rising from the base plate 11, a support plate 28 extending from the second cylindrical body 15, and a hinge shaft 29 rotatably connecting the support plate 27 and the support plate 28. It is composed of Thereby, the second cylindrical body 15 and the lid main body 13 can be opened and closed between the closed position shown in FIG. 2 and the fully open position rotated approximately 180 degrees in the arrow R direction around the hinge shaft 29. it can.

  The lock mechanism 30 includes a lock piece 31 formed on the second cylindrical body 15 and a lock piece 32 rising from the base plate 11. The lock piece 31 and the lock piece 32 When the cylindrical body 15 is in the closed position, it has lock holes 33 which overlap in the horizontal direction. By inserting a U-shaped rod such as a padlock 35 into the lock piece 31 and the lock hole 33 of the lock piece 32 as shown in FIG. 3, the lid body 13 and the second cylindrical body 15 are closed. Locked in A U-shaped handle 36 is provided on the top surface of the lid body 13 near the locked piece 31.

  Here, for convenience of explanation, the side on which the hinge mechanism 26 is disposed is referred to as the “rear side” of the human hole lid 10, and the side on which the lock mechanism 30 is disposed is referred to as the “front side” of the human hole lid 10. The ventilation mechanism provided in the human-hole cover 10 will now be described. FIG. 5 is a plan view of a state in which the lid body 13 and the second tubular body 15 are opened, and the first tubular body 12, the lid body 13 and the second tubular body 15 are all viewed in plan. It is formed in a square shape. With respect to the sizes of the first tubular body 12, the lid main body 13 and the second tubular body 15, an inner dimension (inner dimension) D between the left and right peripheral walls of the second tubular body 15 and between the front and back peripheral walls is The outer peripheral wall 12a of the first cylindrical body 12 and the outer peripheral wall 12a of the front and rear are formed to be larger than the outer dimensions (outer dimensions) d. That is, the sizes of the lid main body 13, the second cylindrical body 15, and the first cylindrical body 12 are set so that the dimension D> the dimension d is satisfied.

  With such dimensioning, as shown in FIG. 3, with the lid body 13 closed, the entire outer peripheral surface of the first cylindrical body 12 and the entire inner peripheral surface of the second cylindrical body 15 In the horizontal direction is secured. The specific size of the first gap S1 is set, for example, in the range of several tens of millimeters to one hundred millimeters, when the outer diameter of the second cylindrical body 15 is approximately 600 millimeters. Of course, it is not limited to these figures.

  In FIG. 7, regarding the heights of the first cylindrical body 12 and the second cylindrical body 15, the dimension of the first cylindrical body 12 rising from the upper surface of the base plate 11 is H, and the second cylindrical shape Assuming that the falling dimension of the body 15 from the lower surface of the lid main body 13 is h, the rising dimension H is set so as to be the falling dimension h. With such dimensioning, when the lid body 13 and the second tubular body 15 are closed, a second between the lower end 15 b of the second tubular body 15 and the upper surface of the base plate 11 is formed. A second vertical gap S2 is secured over the entire circumference of the cylindrical body 15. The specific size of the second gap S2 is, for example, in the range of about 10 mm to several tens of mm when the external diameter of the second cylindrical body 15 is about 600 mm. Of course, it is not limited to these figures.

  The structures of the vent hole 40 and the mesh plate 41, which are the essential parts of the present invention, will be described with reference to FIGS. In FIG. 8, two vent holes 40 long in the horizontal direction are formed at substantially the same height in the four peripheral walls 12 a of the first tubular body 12 having a square shape in plan view. Each vent 40 is formed in a shape in which both longitudinal end sides of a horizontally long rectangle are expanded in a semicircular shape, for example, an oval shape like a field of an athletics stadium.

  On the inner peripheral surface of each peripheral wall 12a of the first tubular body 12, as a holding means for holding the mesh plate 41 at a position covering the vent 40, a pair of guide portions 44 extending in the vertical direction The stopper 45 which connects the lower surface of the guide part 44 horizontally is provided, respectively.

  In FIG. 6, each guide portion 44 is manufactured by a stainless steel angle member having an L-shaped horizontal cross section, and is disposed in the vicinity of the four corners of the first cylindrical body 12 by welding. It is fixed to the inner circumferential surface. By adhering the guide portion 44 to the inner peripheral surface of the peripheral wall 12a by welding, the L-shaped inner surface of the guide portion 44 and the inner peripheral surface of the peripheral wall 12a form a guide groove 46 extending in the vertical direction.

  In FIG. 7, the upper end of each guide portion 44 extending in the vertical direction is positioned between the upper end of the first cylindrical body 12 and the upper end of the vent 40, and the lower end of each guide portion 44 is a vent It is located slightly lower than the lower end of 40. Thus, the guide portion 44 which is longer in the vertical direction than the vertical width of the vent 40 is disposed.

  The stopper 45 is fixed by welding to the lower surface of the guide portion 44 and / or the inner peripheral surface of the peripheral wall 12 a by welding. Thereby, the mesh plate 41 inserted from above into the guide portion 44 is held in a holding position where the lower end abuts against the stopper surface (upper surface) of the stopper 45 and covers the entire vent 40 from the inside. Ru.

  In FIG. 8, the mesh plate 41 disposed on the four peripheral walls 12 a of the first cylindrical body 12 is made of stainless steel and has a rectangular outer frame 41 a and stainless steel stretched in the outer frame 41 a. It is comprised from the net | network main body 41b. The mesh of the mesh main body 41 b is used in a size that can perform an insect repellent function. The width in the longitudinal direction (horizontal direction) of the mesh plate 41 is formed slightly shorter than the distance between the guide grooves of the pair of guide portions 44. Therefore, both end portions in the longitudinal direction of the mesh plate 41 can be inserted from above into the guide grooves 46 of both the guide portions 44, as shown in FIG.

[Operation of First Embodiment]
(1) When inspecting or cleaning the inside of the water storage tank 1, the padlock 35 of the lock mechanism 30 of FIG. 3 is unlocked, the handle 36 is gripped, and the lid body 13 and the second tubular body 15 are hinged. It rotates in the direction of the arrow R around the axis 29 and opens, for example, to the fully open position.

(2) When the mesh plate 41 is removed from the first cylindrical body 12 for replacement, repair or cleaning of the mesh plate 41, with the lid main body 13 and the second cylindrical body 15 opened, As shown sequentially from the lower side (c) to the upper side (a) of FIG. When attaching a new mesh board 41 for replacement or a repaired or cleaned mesh board 41, as shown sequentially from (a) to (c) in the upper part of FIG. The lower end of the mesh plate 41 is engaged with the stopper surface (upper surface) of the stopper 45. As a result, the mesh plate 41 can be held at the position where each vent 40 is covered from the inside.

(3) Even when the lid main body 13 is closed as shown in FIG. 7, the inside of the water storage tank 1 has the vent 40 and the first gap S1 on the outer peripheral side of the first cylindrical body 12 and the second gap S1. It communicates with the outside so that ventilation is possible via the 2nd crevice S2 of the lower part of the cylindrical body 15. That is, as shown by the white arrow, the air inside the water storage tank 1 can be discharged to the outside.

[Effect of First Embodiment]
(1) When the mesh plate 41 is damaged or deteriorated, only the broken mesh plate 41 can be replaced or only the mesh plate 41 can be removed and repaired without replacing the entire human-hole cover. Maintenance and repair costs of the hole cover can be reduced. Moreover, compared with the case where the whole human-hole cover is replaced, the replacement work with a new one is easy.

(2) Since each mesh plate 41 can be removably attached from above to the guide portion 44 having the guide groove 46 extending in the vertical direction, mounting and removal operations of the mesh plate 41 can be easily performed from above.

(3) In the state where the lid main body 13 is closed, the vent hole 40 and the mesh plate 41 are protected from the outside by the second cylindrical body 15, so that the mesh plate 41 is protected from rain, mud and dust from the outside. can do.

(4) In the state where the lid body 13 is closed as shown in FIG. 7, the inside of the water storage tank 1 is ventilated to the outside through the vent 40, the first gap S1 and the second gap S2. Therefore, it is not necessary to separately provide an independent ventilating tower etc., the manufacturing cost of the water reservoir etc. can be reduced and the structure can be simplified.

(5) Since the mesh board 41 is disposed on the inner peripheral surface side of the peripheral wall 12a of the first cylindrical body 12, compared with the case where the mesh board 41 is disposed on the outer peripheral surface side, It can be thickly protected.

(6) Since the first cylindrical body 12 has a square shape in plan view, and the four mesh plates 41 arranged on the four peripheral walls 12a have the same shape and are in common, it is necessary to manufacture many types of mesh plates. There is no problem, and manufacturing process and part control of the mesh board 41 are easy.

Second Embodiment of the Present Invention
FIG. 10 shows the first tubular body 12 and the mesh plate 41 in the second embodiment of the present invention. In FIG. 10, the configuration different from the first embodiment described above is that the holding means for holding each mesh plate 41, that is, the guide portion 44 and the stopper 45 It is provided on the outer peripheral surface. The other structure is the same as that of the first embodiment, and the same components are denoted by the same reference numerals. Therefore, in the second embodiment, each mesh plate 41 is disposed on the outer peripheral surface of each peripheral wall 12a, and covers the vent 40 from the outer side.

  As shown in FIG. 10, when each mesh board 41 is disposed on the outer peripheral side of the peripheral wall 12a of the first cylindrical body 12, the inspection work of the mesh board 41 and its holding state is the first cylindrical body. Easy to see from the outside of 12 and easy to check.

[Other Embodiments]
(1) As the holding means for holding the mesh plate in the first cylindrical body, in the first and second embodiments, the guide portion and the stopper which can insert each mesh plate from above are disposed. Fixing means such as magnets, clips or bolts can also be used.

(2) In the first and second embodiments, the first and second cylindrical bodies are square in plan view, but may be circular, rectangular, or polygonal with a pentagon or more.

(3) The shape of the lower end of the second cylindrical body is not a horizontal straight line, for example, a waveform, and a large number of corrugated second gaps between the upper surface of the base plate and the second cylindrical body (Corresponding to S2) can also be formed.

  The man-hole cover according to the present invention is manufactured in the manufacturing industry of various equipment for civil engineering or construction, and is installed or used in a building or the like at the site of civil engineering or construction work.

Reference Signs List 10 human-hole cover 11 base plate 12 first tubular body 12a peripheral wall 13 lid main body 15 second tubular body 40 air vent 41 screen plate 44, 45 guide portion, stopper (an example of holding means)
46 Guide groove S1 1st gap S2 2nd gap

Claims (6)

The first cylindrical body which is disposed at the entrance of the upper wall of the water storage tank and stands up from the upper wall, a lid body which covers the upper end opening of the first cylindrical body so as to open and close freely, and the outer peripheral edge of the lid body And a second cylindrical body for securing a first gap between the first cylindrical body and the outer peripheral surface of the first cylindrical body, and a vent is formed in a peripheral wall of the first cylindrical body, In a human-hole cover which secures a second gap below the second cylindrical body and which communicates with the outside of the water storage tank via the vent and the first and second gaps.
The mesh plate is provided separately from the first cylindrical body, and the mesh plate is detachably held at a position covering the vent by a holding unit .
The holding means includes a pair of opposing guide portions into which the mesh plate can be inserted from above, and a stopper capable of locking the mesh plate at a position covering the vent.
The mesh hole cover is characterized in that a width in a longitudinal direction of the mesh plate is formed short with respect to a distance between the guide grooves of the guide portion .   The man-hole cover according to claim 1, wherein the holding means holds the mesh plate on an inner peripheral surface side of the first tubular body.   The human-hole cover according to claim 1, wherein the holding means holds the mesh plate on an outer peripheral surface side of the first cylindrical body. The said guide part has a guide groove extended to an up-down direction, The said stopper has a stopper surface contact | abutted to the lower end of the said mesh board, It is described in any one of Claim 1 thru | or 3 Human hole lid. The human-hole cover according to claim 4 , wherein the guide portion is formed of an angle member having an L-shaped cross section. The first cylindrical body and the second cylindrical body are formed in a square shape in plan view, and the four mesh nets of the same shape are formed on the four peripheral walls of the first cylindrical body. plate is detachably arranged, manhole cover according to any one of claims 1 to 5.

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