JP4856928B2 - Structure to prevent the floating of buried objects - Google Patents

Description

  The present invention relates to a structure for preventing the floating of a buried object such as a manhole or a common groove during an earthquake and the like, and a through-hole communicating the underground side and the inside of the buried object with a wall portion of the buried object The present invention relates to a structure for preventing floating of an embedded object, in which a hole is formed and a lid device that allows or blocks the flow of water between the underground side and the inside of the embedded object is installed in the through hole.

As one of means for preventing the floating of underground buried objects such as manholes and common grooves at the time of an earthquake or the like, the technique of Patent Document 1 (Japanese Patent Laid-Open No. 8-170349) is provided.
In this technique, a geotextile is provided around the manhole and the backfill soil around a position where the backfill soil around the manhole is filled with a water passage hole through which the groundwater flows into the manhole. It is buried and the backfill earth and sand between the geotextile and the manhole is sufficiently compacted to prevent the manhole from rising during an earthquake or the like.

JP-A-8-170349

  However, in the above-described conventional technique, a method of embedding a geotextile around a position where the backfill soil around the manhole is filled so as to surround the manhole and the backfill soil, and compacting the backfill soil. For this reason, the entire apparatus is large and requires large-scale construction, resulting in high construction costs and cannot be applied to existing manholes.

  Further, in the above prior art, since a check valve composed of a plate valve that allows the flow of fluid only from the outside (underground) side is provided in the water passage hole drilled in the peripheral wall of the manhole, During normal times other than the time (at the time of static water pressure), there is a problem that earth and sand are mixed with groundwater and push the check valve to enter the manhole and easily accumulate on the bottom of the manhole. .

  The present invention has been made in view of such a situation, and an object of the present invention is a low-cost apparatus that does not require a large-scale construction with a very simple structure and can be easily applied to an existing underground buried object. Further, it is an object of the present invention to provide a structure for preventing the floating of a buried object that can be applied and can prevent the inflow of soil-mixed water into an underground buried object other than in an emergency such as an earthquake.

In order to solve the above-described problems of the prior art, the present invention forms a through hole that connects the underground side and the inside of the buried object in the wall portion of the buried object such as a manhole, a common groove, and the like. A structure for preventing the floating of a buried object by installing a lid device that allows or blocks the flow of water between the underground side and the inside of the buried object, the lid device being inserted into the through-hole. An outer cylinder, a pressure-receiving plate attached to the outer cylinder and having water-stopping properties, and a claw member that locks the pressure-receiving plate, and the pressure-receiving plate of the lid device is an inner part of the cylindrical support member. The claw member is supported by a peripheral surface and is attached to the inner periphery or the outer periphery of the outer cylinder via the support member, and the claw member is configured to lock the support plate so that the pressure receiving plate does not come out from the support member. A plurality of end faces facing the inner side of the buried object are provided, and an outer end face of the pressure receiving plate is provided. In contact position, are arranged at intervals along the circumferential direction, the lid apparatus, the when the pressure difference between the pressure and the buried object the pressure of the ground side exceeds a predetermined value When the claw member is broken and the pressure receiving plate is detached from the outer cylinder, the underground water can flow through the outer cylinder into the embedded object, and when the pressure difference is a certain value or less, the underground It is comprised so that the distribution | circulation of the water between the side and the said embedded object inside may be interrupted | blocked by the said pressure receiving plate.

  Moreover, in this invention, it is preferable that the ring-shaped sealing member is attached to the outer peripheral part of the pressure receiving plate of the said cover apparatus.

  Furthermore, in the present invention, preferably, the lid device is provided in one or both of a through hole formed in a side wall of the embedded object and a through hole formed in a bottom wall of the embedded object. Yes.

  Moreover, in this invention, Preferably, the filter which attaches to the said lid | cover apparatus and captures the earth and sand in the water flow from the underground side is provided.

  Prevents floating of underground buried objects such as manholes and common trenches at the time of earthquake, etc., and forms a through hole in the wall portion of the buried object to communicate the underground side with the inside of the buried object. In buried objects with a floating prevention structure in which a lid device that allows or blocks the flow of water between the underground side and the inside of the buried object is installed in the hole, the lid device is quickly broken in the event of an earthquake. Then, the excess pore water pressure generated in the ground is opened inside the buried object, groundwater is poured into the buried object, and the groundwater is left as it is at the time of static water pressure (low water pressure) other than during an earthquake. In addition, it is required to prevent the earth and sand from flowing into the buried object mixed with the groundwater.

However, according to the first to fourth aspects of the present invention, in either or both of the through-hole formed in the side wall of the buried object such as a manhole or a common groove and the through-hole formed in the bottom wall of the buried object. A lid device that allows or blocks the flow of water between the underground side and the inside of the buried object is provided (Claim 3 ), and the lid device is pressure-receiving in the outer cylinder inserted into the through hole. A plate is attached by a claw member, and the claw member is broken when the pressure difference between the underground pressure and the pressure inside the buried object exceeds a certain value, and the pressure receiving plate is detached from the outer cylinder, Is configured to be able to flow through the outer cylinder into the buried object and when the pressure difference is equal to or less than a certain value, the water pressure between the underground side and the buried object is blocked by the pressure receiving plate. At the time of the earthquake, excessive pore water pressure is generated in the ground, and the outer cylinder and pressure plate of the lid device are Through which the water pressure acts on the claw member, and the stress on the claw member due to the pressure difference between the underground pressure and the pressure inside the buried object is determined by the thickness, width, number of installations, etc. of the claw member When the stress is exceeded, the claw member breaks, the pressure receiving plate comes out of the outer cylinder, and the underground water flows into the embedded object through the outer cylinder, thereby floating the embedded object during an earthquake or the like. Ascent can be prevented. Moreover, the pressure receiving plate of the lid device is supported on the inner peripheral surface of the cylindrical support member, and is attached to the inner periphery or the outer periphery of the outer cylinder via the support member. A plurality of pressure receiving plates are provided on the end surface of the support member facing the inner side of the embedded object so as to prevent the pressure receiving plate from coming out, and are in contact with the outer end surface of the pressure receiving plate along the circumferential direction. If it is arranged at an interval, the lid device can be easily assembled, and the lid device with the optimum conditions can be selected and installed quickly according to the ground conditions and the depth of embedding. .

On the other hand, in a steady state other than an earthquake (at the time of static water pressure), the stress on the claw member due to the pressure difference between the water pressure acting on the claw member, that is, the pressure on the underground side and the pressure inside the buried object is The claw member does not break because it does not reach the breaking stress determined by the thickness, width, number of installations, etc., and therefore the water on the ground side is blocked by the pressure receiving plate. become.
Thereby, it is possible to avoid the earth and sand from flowing into the buried object and being deposited at the bottom of the buried object in the ground water and the ground water at a stationary time other than the time of the earthquake.

Furthermore, as in claim 4 , a filter attached to the lid device for capturing earth and sand in the water flow from the underground side is provided at an appropriate position, so that any of the earthquake and the steady state other than the earthquake can be obtained. Also in this case, the earth and sand mixed in the groundwater can be captured by the filter, and the earth and sand can be prevented from flowing into the buried object and accumulating at the bottom thereof.

Therefore, according to the present invention, a lid device comprising an outer cylinder inserted into a through-hole, a pressure receiving plate attached to the outer cylinder, and a claw member for locking the pressure receiving plate is provided as a wall of an embedded object. This is a low-cost device with a very simple structure that does not require large-scale construction.In the event of an earthquake, the claw member breaks and the pressure-receiving plate is detached from the outer cylinder, so that The buried object can prevent the floating of the buried object by allowing it to flow into the buried object, and can reliably block the inflow of underground water into the buried object by a pressure receiving plate in a steady state other than during an earthquake. Can be obtained.
In addition, since it is possible to prevent the floating of the buried object by incorporating a lid device into the existing through-hole provided in the buried object, the structure for preventing the floating of the buried object according to the present invention is also applied to the existing buried object. Easy to apply.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
FIG. 1 is a longitudinal sectional view of a manhole as an embedded object to which the embodiment of the present invention is applied.
In FIG. 1, 1 is a manhole, 2 is a manhole main body which is a concrete part of the manhole 1, and this manhole main body 2 is comprised, for example by stacking cylindrical precast concrete blocks. A bottom plate 3 is provided at the bottom of the manhole body 2, and an invert block 4 is provided on the bottom plate 3. The invert block 4 is formed with an invert 4a, and sewer pipes 5 are connected to both ends of the invert 4a so that the drainage is circulated through the interior 200 of the manhole body 2.

The manhole body 2 includes a cylindrical upper block 7 in which one or more cylindrical body blocks 6 are stacked (one in this example), and one side thereof is inclined in a tapered shape on the body block 6. It is formed by stacking. Further, a ring-shaped opening block 8 is placed on the upper part of the upper block 7, and an upper lid 9 is fitted and disposed in the upper end opening of the opening block 8. The body block 6, the upper block 7, and the opening block 8 form a side wall (peripheral wall) 2a.
The manhole body 2 configured as described above is embedded in the underground 11 so that the upper surface of the upper lid 9 is at the same height as the ground surface 10.

The trunk block 6 has a plurality of through-holes 12 communicating the interior 200 of the manhole body 2 with the underground 11. In addition, the bottom plate 3 and the invert block 4 are provided with a plurality of through holes 13 that pass through the bottom plate 3 and the invert block 4 to communicate the interior 200 of the manhole body 2 with the underground 11. These through-holes 12 and 13 are provided in an arbitrary number at arbitrary locations according to the ground conditions.
In the through hole 12 of the body block 6 and the through hole 13 of the bottom plate 3 and the invert block 4, a lid device 14 that is the subject of the present invention is attached.
The lid device 14 may be provided on both the trunk block 6 and the bottom plate 3 and the invert block 4 as in this example, or may be provided on either the trunk block 6, the bottom plate 3 and the invert block 4. .

2 is a longitudinal sectional view of the lid device according to the embodiment of the present invention, and FIG. 3 is a side view of the lid device.
In FIG. 2, the lid device 14 is mounted in the through holes 12 and 13, and is mainly configured by including an outer cylinder 20, a pressure receiving plate 21, and a claw member 22. The outer cylinder 20 is a socket formed in a cylindrical shape, and is inserted into the through hole 12 (or the through hole 13) via a seal ring 27 (or mortar, etc.) with the outer peripheral surface fluid-tight. .
The pressure receiving plate 21 of the lid device 14 is supported by an inner peripheral surface of a cylindrical support member 23 which is formed with a screw portion 23a on the outer periphery and is screwed and fixed to the inner periphery of the outer cylinder 20. It is attached to the inner periphery of the outer cylinder 20 via Moreover, the pressure receiving plate 21 and the support member 23 are provided so as to be located on the inner side 200 side of the manhole body 2.

  The pressure receiving plate 21 is formed in a disk shape having a predetermined thickness, and the outer diameter thereof is set slightly smaller than the inner diameter of the support member 23. And the outer periphery of the pressure receiving plate 21 is provided with a concave groove 21a for fitting a ring-shaped seal member (for example, an O-ring) 24, and in a state where the pressure receiving plate 21 is fitted in the support member 23, The seal member 24 is configured to abut against the inner peripheral surface of the support member 23 so as to maintain water stoppage. When the pressure receiving plate 21 is formed of a material having elasticity such as water-stopping properties, it is not necessary to use the seal member 24, and the outer diameter of the pressure receiving plate 21 is substantially the same as the inner diameter of the support member 23. What is necessary is just to form and insert in a magnitude | size.

On the other hand, as shown in FIGS. 2 and 3, a plurality of claw members 22 are provided on the end surface of the support member 23 facing the inside 200 of the manhole body 2 so that the pressure receiving plate 21 does not come out of the support member 23. (4 or 3 may be used in the present embodiment) are provided, and are arranged so as to face each other at equal intervals along the circumferential direction at a position where they abut against the outer end surface of the pressure receiving plate 21. For this reason, the claw member 22 is fastened and fixed to the end surface of the support member 23 by the claw fixing screw 25, and the tip end side is disposed so as to protrude from the inner peripheral surface of the support member 23.
Further, the claw member 22 is formed in a plate shape using a resin material, and it is possible to adjust the breaking pressure by selecting the size of the cross-sectional shape of thickness, width and length, and the number of installation. ing. That is, the claw member 22 is broken when the pressure difference between the pressure on the ground 11 side and the pressure on the inside 200 of the manhole body 2 exceeds a certain value, and the pressure receiving plate 21 is supported by the pressure on the ground 11 side. When the water on the side of the underground 11 is allowed to flow through the outer cylinder 20 and the support member 23 to the inside 200 of the manhole body 2 and the pressure difference is below a certain value. The pressure receiving plate 21 is locked without breaking, and the pressure receiving plate 21 blocks the flow of water between the underground 11 side and the interior 200 of the manhole body 2.

Further, a filter 26 is attached to the inner periphery of the outer cylinder 20 at a position opposite to the outer end surface to which the claw member 22 of the support member 23 is attached, and captures sediment in the water stream from the underground 11 side. The filter 26 may be directly attached to the end surface of the support member 23, but may be disposed by being sandwiched between the support member 23 using a fixing plate (not shown). Further, as shown by the chain line in FIG. 2, the filter 26 may be attached to the inner periphery of the underground 11 side portion or the axial center portion of the outer cylinder 20.
With this configuration, the earth and sand mixed in the underground water in the underground 11 can be captured by the filter 26 in both cases of an earthquake and a steady state other than the earthquake, and the earth and sand flows into the interior 200 of the manhole body 2. Thus, accumulation at the bottom can be avoided.

  In the embodiment of the present invention, either one or both of the through-hole 12 formed in the side wall 2a of the manhole body 2 and the through-hole 13 formed in the bottom wall portions 3 and 4 of the manhole body 2 are exposed to the underground 11 The lid device 14 that allows or blocks the flow of water between the side and the interior 200 of the manhole body 2 is provided, and the lid device 14 is supported by a support member 23 in the outer cylinder 20 that is inserted into the through holes 12 and 13. When the pressure difference between the pressure on the ground side and the pressure inside the manhole body 2 exceeds a certain value, the claw member 22 that locks the pressure receiving plate 21 arranged in the interior of the manhole body 2 is broken to break the pressure receiving plate 21. The outer cylinder 20 and the support member 23 are separated from each other, and the water on the underground 11 side can flow through the outer cylinder 20 and the support member 23 to the inside 200 of the manhole body 2 and when the pressure difference is below a certain value, 11 side and manhole book 2 is configured to be blocked by the pressure receiving plate 21, so that excessive pore water pressure is generated in the underground 11 during an earthquake, and the pressure receiving plate 21 in the outer cylinder 20 of the lid device 14. The water pressure acts on the claw member 22 through, and the stress of the claw member 22 due to the pressure difference between the pressure on the underground 11 side and the pressure inside the manhole body 2 is determined by the thickness, width, etc. of the claw member 22 When the stress is exceeded, the claw member 22 is broken and the pressure receiving plate 21 is pulled out, and the water on the underground 11 side flows into the interior 200 of the manhole body 2 through the outer cylinder 20 and the support member 23, thereby causing an earthquake. It is possible to prevent the manhole 1 from being lifted up at times.

On the other hand, during steady (static water pressure) other than during an earthquake, a pressure difference between the pressure of water acting on the claw member 22 that locks the pressure receiving plate 21, that is, the pressure on the underground 11 side and the pressure in the interior 200 of the manhole body 2. Since the stress of the claw member 22 does not reach the breaking stress described above, the claw member 22 does not break down, and the water on the ground 11 side flows into the interior 200 of the manhole body 2 by the pressure receiving plate 21 that is locked. Will be blocked.
Thereby, it is possible to prevent the earth and sand from flowing into the interior 200 of the manhole body 2 and being deposited on the bottom of the manhole body 2 at the time of stationary (static water pressure) other than the earthquake.

  Further, since the pressure receiving plate 21 is supported on the inner peripheral surface of the support member 23 and is attached to the inner periphery of the outer cylinder 20 via the support member 23, the assembling work of the lid device 14 becomes easy and the workability is improved. Can be improved.

While the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made based on the technical idea of the present invention.
For example, the lid device 14 may be configured by screwing and fixing the inner peripheral portion of the support member 23 to the outer peripheral portion of the outer cylinder 20. Further, the claw member 22 may be fixed by being fastened to the end surface of the outer cylinder 20 instead of the support member 23. Further, an integrated structure lid device in which the claw member 22 and the support member 23 are integrally formed may be used. Thereby, the structure for preventing the floating of the buried object is further simplified.

It is a longitudinal section showing a manhole to which an embodiment of the present invention is applied. It is a longitudinal cross-sectional view which shows the cover apparatus in embodiment of this invention. It is a side view which shows the cover apparatus in embodiment of this invention.

Explanation of symbols

1 Manhole 2 Manhole body 2a Side wall (peripheral wall)
DESCRIPTION OF SYMBOLS 3 Bottom plate 4 Invert block 4a Invert 5 Sewer pipe 6 Trunk block 7 Upper block 8 Opening block 9 Top cover 10 Ground surface 11 Underground 12, 13 Through-hole 14 Lid device 20 Outer cylinder 21 Pressure receiving plate 22 Claw member 23 Support member 24 Seal member 25 Claw fixing screw 26 Filter 200 Inside

Claims (4)

A through hole is formed in the wall portion of the buried object such as a manhole or a common groove to communicate the underground side and the inside of the buried object, and the water flows between the underground side and the inside of the buried object in the through hole. A structure for preventing floating of an embedded object by installing a lid device that allows or blocks the lid, the lid device being attached to the outer cylinder, and being attached to the outer cylinder, And a claw member for locking the pressure receiving plate, and the pressure receiving plate of the lid device is supported on the inner peripheral surface of the cylindrical support member, and the outer cylinder is interposed through the support member. A plurality of the claw members are provided on an inner surface or an outer periphery, and are provided on an end surface of the support member facing the inner side of the embedded object so that the pressure receiving plate does not come out of the support member. And a position that contacts the outer end surface of the pressure receiving plate, and is arranged at intervals along the circumferential direction. Ri, the lid device, the pawl member is ruptured to disengage the pressure plate from the outer tube when the pressure difference between the pressure of the buried object inside the pressure of the ground side exceeds a predetermined value, The underground water can flow through the outer cylinder into the buried object, and when the pressure difference is equal to or less than a certain value, the water pressure between the underground side and the buried object is passed through the pressure receiving plate. A structure for preventing floating of an embedded object, characterized in that the structure is configured to be blocked by. The structure according to claim 1, wherein a ring-shaped seal member is attached to an outer peripheral portion of the pressure receiving plate of the lid device. The lid device according to claim, characterized in that it kicked set in either or both of the bottom through-hole formed in the wall of the formed through-hole and the buried object in the side wall of the buried object 1. A structure for preventing floating of an embedded object according to 1. The structure according to claim 1, further comprising a filter attached to the lid device for capturing earth and sand in a water flow from the ground side .

Images