JP2018204280A - Water block structure - Google Patents

Abstract

To provide a water block structure and the like which can easily block water in a vertical shaft.SOLUTION: The inside of a vertical shaft 1 is divided into a stop-log installation chamber 12 and a maintenance chamber 13 by a partition wall 11 having an opening 111, and a stop-log 14 for closing the opening 111 is installed in the stop-log installation chamber 12. Grooves 121 into which both side portions of the stop-log 14 are inserted are provided at both sides of the stop-log installation chamber 12, and a door stop face 121a at a lower part of the groove 121 includes a slope proceeding forward as going downward. When the stop-log 14 is lifted down in the stop-log installation chamber 12, the stop-log 14 slides along the slope of the door stop face 121a, and the stop-log 14 is pressed to the partition wall 11 side. A top end of the stop-log 14 is below water level in the vertical shaft 1.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a water shielding structure in a shaft connected to a flow path.

  In power plants such as thermal power plants, a large amount of seawater is used to cool the turbine. There is a water intake channel as equipment for flowing the taken seawater to the turbine, and there is a water discharge channel as equipment for discharging the seawater used for cooling the turbine. Generally, shield tunnels and box fences are used for intake and discharge channels, and vertical shafts are installed on both sides.

  An example of a vertical shaft is shown in FIG. 20A, and a vertical cross section along the flow direction of seawater is seen with respect to the vertical shaft 100 and the flow channel 200 (intake channel or discharge channel) connected to the vertical shaft 100. is there.

  The vertical shaft 100 is partitioned into a corner dropping installation chamber 120 and a maintenance chamber 130 on a plane by a partition wall 110 having an opening 1101. The corner drop installation chamber 120 is provided for water shielding by corner drop. The maintenance chamber 130 is provided for small heavy equipment and workers to enter during maintenance such as shell removal and mud removal in the flow path 200 and inspection of the flow path 200.

  In the shaft 100 on both sides of the channel 200, as shown in FIG. 20 (b), a plate-shaped corner drop 300 is installed in the corner drop installation chamber 120 to block the opening 1101, and the water is blocked. The flow path 200 and the maintenance chamber 130 are drained, and a small heavy machine or a worker is put into the flow path 200 from the maintenance chamber 130 to perform maintenance or the like.

  The corner drop 300 is temporarily placed in the vicinity of the shaft 100 except when the water is blocked, and is suspended and installed in the corner drop installation chamber 120 with a wire from a crane or the like only when the water is blocked. The wire is collected after the corner drop 300 is installed. Patent Document 1 describes an example of such a corner drop.

  The corner drop 300 is basically a substantially rectangular plate material, and is made of prestressed concrete, reinforced concrete, or steel. When the water depth of the vertical shaft 100 is large, a plurality of corner droppings 300 are manufactured in a size that makes it easy to hang with a crane, and are stacked in multiple stages up to a height above the water surface in the vertical shaft 100.

  A water stop rubber (not shown) is disposed on the front surface of the corner drop 300. When draining as described above, the corner drop 300 is pressed against the partition wall 110 by the water pressure difference between both sides, and the water stop rubber is crushed. Can be blocked. When the corner drop 300 is installed, a wedge (not shown) is driven on the rear side of the corner drop 300, and the corner drop 300 is pressed against the partition wall 110 in advance so that the waterproof rubber is brought into contact with the partition wall 11. At the time of installing such a corner drop 300, a diver needs to dive into the corner drop installation chamber 120 in order to drive a wedge and remove the wire described above.

  When the maintenance or the like of the flow path 200 is completed, seawater is poured into the drained flow path 200 or the like, the difference in water level between the two sides of the corner drop 300 is set to 0, the wedge is removed, a wire is attached to the corner drop 300, and the angle drop 300 Is removed by lifting it with a crane or the like. The removal of the corner drop 300 is sequentially performed from the upper one. Even when the corner drop 300 is removed, a diver needs to dive into the corner drop installation chamber 120 and perform diving work.

No. 07-38362

  When the water depth of the vertical shaft 100 is large, it is difficult to perform a diving operation in which a diver dives in the narrow corner-dropping installation chamber 120, and there is a problem in safety and the construction cost is high. In particular, the operation of driving the wedge and pressing the corner drop 300 against the partition wall 110 is difficult because the corner drop 300 is a heavy object and is a diving operation.

  Furthermore, if the water depth of the shaft 100 is large, a large number of corner drops 300 are required, and the installation and removal of the corner drops 300 becomes complicated. Also, a considerable space is required for temporary placement of the corner drop 300 on the ground.

  Patent Document 1 performs water shielding using corner dropping. However, as described above, the corner dropping is not pressed against the partition wall, and since one corner dropping is used, it is large when the water depth of the shaft 100 is large. It is necessary to drop the corners of the size, and the weight makes it difficult to hang down with a crane or the like.

  The present invention has been made in view of the above problems, and an object thereof is to provide a water shielding structure and the like that can easily perform water shielding in a shaft.

  The present invention for solving the above-described problem is a water shielding structure in a shaft connected to a flow path, and a wall body having an opening is provided inside the shaft, and in a space adjacent to the wall body, A corner drop for closing the opening is installed, and a groove into which both side portions of the corner drop are inserted is provided on both sides of the space, and the groove or the corner drop is inserted into the corner drop when the corner drop is installed. It has a pressing mechanism used in order to press down to the wall side, It is a water-proof structure characterized by things.

  In the present invention, since the corner drop and the groove for the corner drop guide have a pressing mechanism used for pressing the corner drop in advance, the diving work in which the diver dives into the corner drop installation chamber as described above is performed. Reduction or omission is possible, and water can be easily blocked by dropping corners in the shaft.

The upper end of the corner drop is below the water surface in the shaft.
In the present invention, water can be reliably shielded by corner dropping using the pressing mechanism, so the corner dropping only needs to have a size close to the minimum for closing the opening, up to the level above the water surface in the shaft. There is no need to stack. Therefore, it is easy to install and remove the corner drop, and no space is required for temporary placement on the ground.

On the wall side surface of the corner drop, a water stop material is provided at a position surrounding the opening.
In the present invention, the water-stopping material is crushed by pressing the corner drop on the wall body side, and reliable water shielding can be performed.

The door contact surface of the groove desirably has an inclination with respect to the vertical direction as the pressing mechanism. It is also desirable that the corner drop has an inclination corresponding to the inclination of the door contact surface.
In this case, the corner drop slides along the inclination of the door-to-door surface, so that a pressing force to the wall body can be applied to the corner drop. Since the corner drop has an inclination corresponding to the inclination of the door-to-door surface, the slipping becomes smooth, which is also preferable in terms of applying a pressing force.

It is desirable that the corner drop has an attachment portion for attaching a pulling material for drawing the corner drop toward the wall as the pressing mechanism.
In this case, the corner drop can be pressed against the wall body by pulling the corner drop toward the wall body such as the partition wall described above. Since the corner drop can be pulled in from the wall body side in the above-described maintenance room, for example, there is no need for a diving operation in which a diver enters the narrow corner drop installation room as described above.

In addition, for the corner drop, it is desirable that a pressing member for pressing the corner drop against the wall body is attached to a surface opposite to the wall body as the pressing mechanism. The pressing material is, for example, a spring member, but may be an inflatable bag.
The corner drop can be pressed against the wall body also by these pressing materials. By using a spring member or a bag body as the pressing material, it is possible to achieve water shielding at low cost.

In addition, it is desirable that the corner drop is composed of a plurality of upper and lower units having a hollow portion.
If the size of the channel or opening is large and a large corner drop is required, the corner drop can be reduced in weight by configuring it from a plurality of units having hollow portions, and transportation and installation are facilitated. At the time of water shielding, for example, one unit can be dropped by hanging while assembling the unit. When hanging off the corner drop, it is possible to secure a sufficient weight to suspend the corner drop by pouring water into the hollow part, and when removing the corner drop, the hollow part can be easily lifted by draining.

The channel is, for example, a seawater intake channel or a water discharge channel in a power plant.
By applying the present invention to a seawater intake channel and a water discharge channel at a power plant, diving work by divers who have conventionally been required for water shielding is reduced or omitted, and water shielding by corner dropping is easily performed. Can do.

  ADVANTAGE OF THE INVENTION By this invention, the water shielding structure etc. which can perform the water shielding in a vertical shaft easily can be provided.

The figure which shows the outline of the shaft 1 and the flow path 2. FIG. The figure which shows the vertical shaft 1. FIG. The figure which shows the corner drop 14. The figure explaining installation of the corner drop 14. The figure explaining installation of the corner drop 14. The figure which shows the corner drop 14a. The figure which shows the vertical shaft 1a. The figure explaining installation of the corner drop 14a. The figure explaining installation of the corner drop 14a. The figure which shows the vertical shaft 1b. The figure explaining installation of the corner drop 14b. The figure which shows the vertical shaft 1c. The figure explaining installation of the corner drop 14c. The figure which shows the shaft 1d. The figure explaining installation of the corner drop 14d. The figure which shows the corner drop 14e. The figure which shows the cross section of the corner drop 14e. The figure explaining installation of the corner drop 14e. The figure explaining installation of the corner drop 14e. The figure which shows the vertical shaft 100. FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
(1. Vertical shaft 1)
FIG. 1 is a diagram showing an outline of a shaft 1 and a flow path 2 according to an embodiment of a water-impervious structure of the present invention. The shaft 1 is provided for water shielding and maintenance on both sides of a water intake channel or a water discharge channel (flow channel 2) through which seawater (fluid) for turbine cooling of a power plant such as a thermal power plant flows. .

  FIG. 2 is a view showing the shaft 1. Fig.2 (a) is a figure which shows the vertical cross section along the flow direction of seawater, FIG.2 (b) is a figure which shows the horizontal cross section along line AA of Fig.2 (a). The shaft 1 in FIG. 2 corresponds to the left shaft 1 in FIG.

  The shaft 1 is a bottomed cylindrical concrete structure. The plane of the vertical shaft 1 has a substantially rectangular shape, but is not limited thereto.

  Both sides of the lower part of the shaft 1 are connected to the flow path 2. The flow path 2 is formed inside a shield tunnel or the like provided in the ground. In the present embodiment, the flow path 2 is at a depth of about 10 to 30 m underground, and the shaft 1 has a depth corresponding to this.

  The plane of the shaft 1 is divided into a corner dropping installation chamber 12 and a maintenance chamber 13 by a substantially vertical partition wall 11 (wall body) inside the shaft 1, and these chamber spaces are adjacent to the partition wall 11. An opening 111 is provided below the partition wall 11. As shown in FIG. 5B to be described later, the opening 111 is substantially circular.

  The corner drop installation chamber 12 is a room space for installing a plate-shaped corner drop. Grooves 121 for inserting and positioning the corner drop are provided at the bottom of the corner drop installation chamber 12 and both sides in the width direction. The width direction of the corner dropping installation chamber 12 corresponds to the vertical direction of FIG.

  The wall surfaces before and after the groove 121 serve as a door contact surface 121 a along the width direction of the corner dropping installation chamber 12. The front door contact surface 121 a is provided so as to be continuous with the partition wall 11. Here, “front” refers to the partition wall 11 side, and corresponds to the right side of FIGS. “After” refers to the opposite side of the partition wall 11 and corresponds to the left side of FIGS.

  The maintenance chamber 13 is a chamber space used for entering and exiting small heavy machinery and workers when performing maintenance and inspection of the flow path 2.

(3. Corner drop 14)
FIG. 3 is a view showing a corner drop 14 used in the water-impervious structure of the present embodiment. The corner drop 14 is for blocking the opening 111 and blocking water, and has a substantially rectangular plate-shaped main body 141. The main body 141 is made of concrete or steel. An annular waterproof rubber 143 is provided on the front surface of the main body 141 as a waterproofing material.

  On both side portions of the main body 141 inserted into the grooves 121 on both sides of the corner dropping installation chamber 12, inclined brackets 142 having a substantially right triangle shape are provided. The inclined metal fitting 142 may be attached to the main body 141 with a bolt or the like, or may be manufactured integrally with the main body 141. The inclined metal fitting 142 is provided on the rear surface of the main body 141 and has an inclination toward the front as it goes downward.

  As shown in FIG. 2A, the upper portion of the groove 121 is provided in a substantially vertical direction with a substantially constant width H. This width H is slightly larger (for example, about 10 cm) than the maximum thickness of the corner drop 14 (the thickness of the upper end of the corner drop 14). On the other hand, at the lower part of the groove 121, the rear door contact surface 121a has an inclination toward the front (inclination with respect to the vertical direction) as it goes downward, whereby the width H of the groove 121 gradually decreases, and the bottom part Thus, the thickness is the same as the thickness of the lower end of the corner drop 14. The inclination of the door contact surface 121a described above corresponds to the inclination of the inclined metal fitting 142 (the inclination angle is approximately the same).

(4. Water shielding by corner drop 14)
FIGS. 4A and 4B are views for explaining the installation of the corner drop 14. FIG. 4A is a diagram illustrating the installation of the corner drop 14 and FIG. 4B illustrates a state where the installation of the corner drop 14 is completed.

  The corner drop 14 is temporarily placed in the vicinity of the shaft 1 except at the time of water shielding, and is hung from a crane or the like by a wire (not shown) at the time of water shielding, as shown in FIG. It is suspended to the bottom of the corner dropping installation chamber 12 and installed as shown in FIG.

  When the corner drop 14 is suspended, both sides thereof are inserted into the grooves 121 on both sides of the corner drop installation chamber 12, thereby guiding the corner drop 14. When the corner drop 14 is suspended, at the lower part of the groove 121, the corner drop 14 slides downward using the inclination of the rear door contact surface 121a as a guide as shown by the arrow a in FIG. As shown, the corner drop 14 is pressed against the partition wall 11 side, and the water blocking rubber 143 contacts the partition wall 11 around the opening 111.

  Thus, a water shielding structure is formed in which the opening 111 is blocked by the corner drop 14. The inclination of the door contact surface 121a described above functions as a pressing mechanism that presses the corner drop 14 against the partition wall 11 when the corner drop 14 is installed. As shown in FIG. 4B, the lower end of the corner drop 14 fits into the groove 121 at the bottom of the corner drop installation chamber 12, but is positioned slightly above the bottom surface of the groove 121. In FIG. 4, the illustration of the water stop rubber 143 is omitted.

  Thereafter, by draining the side of the flow path 2 (the flow path 2 on the right in FIG. 4) for maintenance or the like, the corner drop 14 is further pressed against the partition wall 11 by the water pressure difference, and the water stop rubber 143 is crushed. Water can be reliably shielded.

  FIG. 5B is a cross-sectional view taken along line BB in FIG. The elevation surface of the corner drop 14 is slightly larger in the vertical and horizontal directions than the opening 111 of the partition wall 11 (for example, about 30 to 40 cm), and can cover and close the opening 111. Further, the upper end of the corner drop 14 is below the water surface in the shaft 1. The water-stopping rubber 143 is disposed at a position slightly outside (for example, about 20 cm) from the opening 111 so as to surround the opening 111.

  As described above, according to the present embodiment, the guide groove 121 of the corner drop 14 has the inclination of the door contact surface 121a as a pressing mechanism used for pressing the corner drop 14 in advance, and the corner drop 14 By sliding along the inclination, it is possible to apply a pressing force toward the partition wall 11 to the corner drop 14. Accordingly, it is possible to reduce or eliminate the diving work of a diver diving in the corner dropping installation chamber 12 like the conventional wedge installation work, and it is possible to easily perform the water shielding by the corner dropping 14 in the shaft 1. it can.

  Further, in this embodiment, since the water shielding by the corner drop 14 can be reliably performed using the above pressing mechanism, the corner drop 14 only needs to have a size close to the minimum for closing the opening 111, There is no need to stack up above the water surface in the shaft 1. Therefore, the installation and removal of the corner drop 14 are easy and inexpensive, and no space is required for temporary placement on the ground.

  Further, since the corner drop 14 has an inclination corresponding to the inclination of the door contact surface 121a, the slipping becomes smooth, and it is also suitable for the application of pressing force. Furthermore, since the water stop rubber 143 is provided at a position surrounding the opening 111 on the front surface of the corner drop 14, the water stop rubber 143 is crushed by pressing the corner drop 14 against the partition wall 11, and reliable water shielding can be performed. Is possible.

  However, the present invention is not limited to this. For example, the shaft 1 of the present embodiment is applied to a seawater intake channel or a water discharge channel in a power plant, but is not limited thereto. However, by applying the present invention to such intake channels and discharge channels, it is possible to reduce or omit the diving work by divers who have conventionally been required for water shielding, and easily perform water shielding by corner dropping 14. it can.

  In this embodiment, the shape of the opening 111 and the flow path 2 is substantially circular, and the corner drop 14 is substantially rectangular. However, these can be changed as appropriate. For example, if the opening 111 is substantially circular, the lower side of the corner drop 14 may be substantially semicircular and the upper side may be substantially rectangular. Further, in this embodiment, the inclined bracket 142 is attached to the corner drop 14, but the same shape as the inclined bracket 142 may be formed of concrete, and the entire corner drop 14 may be integrally formed of concrete.

  Hereinafter, another example of the present invention will be described as second to sixth embodiments. Each embodiment will mainly describe differences from the embodiments described so far, and description of similar points will be omitted. In addition, the configurations described in each embodiment including the first embodiment can be used in combination as necessary.

[Second Embodiment]
FIG. 6 is a view showing a corner drop 14a used in the water shielding structure of the second embodiment. The main body 141a of the corner drop 14a has a substantially rectangular plate shape, but its front surface has an inclination toward the rear as it goes downward, and the cross section in the thickness direction is wedge-shaped.

  FIG. 7 is a view showing a shaft 1a according to the water-impervious structure of the second embodiment. Also in this embodiment, the upper part of the groove 121 is provided in a substantially vertical direction with a substantially constant width H slightly larger (for example, about 10 cm) than the maximum thickness of the corner drop 14a (the thickness of the upper end of the corner drop 14a). On the other hand, in the lower part of the groove 121, the front door contact surface 121a and the partition wall 11 have an inclination toward the rear (inclination with respect to the vertical direction) as they go downward, whereby the width H of the groove 121 gradually decreases. At the bottom, the thickness is the same as the thickness of the lower end of the corner drop 14a. The inclination of the door contact surface 121a and the like described above corresponds to the inclination of the front surface of the corner drop 14a.

  FIGS. 8A and 8B are diagrams illustrating the installation of the corner drop 14a. FIG. 8A is a diagram illustrating the installation of the corner drop 14a, and FIG. 8B illustrates a state where the installation of the corner drop 14a is completed.

  In this embodiment, when the corner drop 14a is suspended, the corner drop 14a slides downward in the lower part of the groove 121 using the inclination of the front door contact surface 121a as a guide as indicated by an arrow a 'in FIG. At this time, the corner drop 14a is pressed against the rear door contact surface 121a as shown by an arrow b '. The corner drop 14 a is pressed against the partition wall 11 by the reaction force, and the water blocking rubber 143 contacts the partition wall 11 around the opening 111.

  Thus, a water shielding structure is formed in which the opening 111 is blocked by the corner drop 14a. The subsequent procedure is the same as in the first embodiment. The inclination of the door contact surface 121a described above functions as a pressing mechanism that presses the corner drop 14a against the partition wall 11 when the corner drop 14a is installed. As shown in FIG. 8B, the lower end of the corner drop 14 a fits into the groove 121 at the bottom of the corner drop installation chamber 12, but is positioned slightly above the bottom surface of the groove 121.

  Also in this embodiment, as in the first embodiment, it is easy to perform water shielding by the corner drop 14a in the shaft 1a. In this embodiment, the corner drop 14a having an inclination on the front surface is integrally formed of concrete. However, as in the first embodiment, the inclination on the front surface can be formed by a metal fitting.

[Third embodiment]
FIG. 10 is a view showing a shaft 1b according to the water-impervious structure of the third embodiment. In the present embodiment, as in the first embodiment, the upper portion of the groove 121 is provided with a substantially constant width H. This width H is slightly larger (for example, about 10 cm) than the thickness of the corner drop described later.

  However, in the middle of the groove 121, the rear door contact surface 121a is provided with an inclination toward the front as it goes downward (inclination with respect to the vertical direction), whereby the width H of the groove 121 gradually decreases, The lower part is substantially constant with a narrower width H than the upper part of the groove 121. This width H is about the same as or slightly larger than the thickness of the corner drop (for example, about 1 cm).

  FIGS. 11A and 11B are diagrams illustrating the installation of the corner drop 14b. FIG. 11A is a diagram showing the installation of the corner drop 14b, and FIG. 11B shows a state where the installation of the corner drop 14b is completed.

  In the present embodiment, as the corner drop 14b, the corner drop 14 of the first embodiment in which the inclined metal fitting 142 is omitted is used. That is, the corner drop 14b is composed only of a substantially rectangular plate-shaped main body 141, and a water stop rubber similar to that of the first embodiment is provided on the front surface thereof.

  When the corner drop 14b is suspended in the same manner as described above, in the middle of the groove 121, the corner drop 14b slides downward using the inclination of the rear door contact surface 121a as in the first embodiment, and at this time the corner drop 14b Is pressed against the partition wall 11 side, and the water blocking rubber on the front surface comes into contact with the partition wall 11 around the opening 111.

  Thus, a water shielding structure is formed in which the opening 111 is blocked by the corner drop 14b. The subsequent procedure is the same as in the first embodiment. The inclination of the door contact surface 121a described above functions as a pressing mechanism that presses the corner drop 14b against the partition wall 11 when the corner drop 14b is installed. The lower end of the corner drop 14 b fits into the groove 121 at the bottom of the corner drop installation chamber 12 and contacts the bottom surface of the groove 121.

  Thereby, also in this embodiment, it becomes easy to perform the water shielding by the corner drop 14b in the shaft 1b as in the first embodiment.

[Fourth Embodiment]
FIG. 12 is a view showing a shaft 1c according to the water-impervious structure of the fourth embodiment. In this embodiment, the groove 121 of the corner drop installation chamber 12 is provided in a substantially vertical direction with a substantially constant width H over the entire height. This width H is slightly larger (for example, about 10 cm) than the thickness of a corner drop main body to be described later. A fixing anchor (retracting material) mounting member 144 described later is provided on the surface of the partition wall 11 on the maintenance chamber 13 side or in the vicinity thereof.

  FIGS. 13A and 13B are diagrams illustrating the installation of the corner drop 14c. FIG. 13A is a diagram showing the installation of the corner drop 14c, and FIG. 13B shows a state where the installation of the corner drop 14c is completed.

  In the present embodiment, as the corner drop 14c, one provided with an insert 145 (mounting portion) for mounting a fixed anchor on the front surface of a substantially rectangular plate-shaped main body 141 is used. The insert 145 is, for example, an embedded nut.

  In this embodiment, after hanging the corner drop 14 c to the bottom of the corner drop installation chamber 12, the diver dives into the maintenance chamber 13, attaching one end of the fixed anchor 146 to the insert 145 and attaching the other end of the fixed anchor 146. The nut is tightened through a hole (not shown) in the material 144. As a result, the corner drop 14 c is pulled toward the partition wall 11, and the corner drop 14 c is pressed against the partition wall 11 so that the water blocking rubber on the front surface is brought into contact with the partition wall 11. The attachment member 144, the insert 145, and the fixed anchor 146 are provided at four or more locations at equal intervals along the inner edge at locations corresponding to the vicinity of the inner edge of the opening 111.

  Thus, a water shielding structure is formed in which the opening 111 is blocked by the corner drop 14c. The above-described insert 145 functions as a pressing mechanism used for pressing the corner drop 14 a against the partition wall 11 side by the fixed anchor 146.

  After that, by draining in the same manner as described above, the corner drop 14c is further pressed against the partition wall 11 due to the water pressure difference, and the water blocking rubber is crushed so that the water can be reliably blocked. After the maintenance of the flow path 2 and the like, after the fixed anchor 146 and the like are collected, the drained flow path 2 and the like are filled again with seawater, and the corner drop 14c is lifted and removed.

  Also in the present embodiment, as in the first embodiment, it is easy to perform water shielding by the corner drop 14c in the shaft 1c. Since the corner drop 14c can be pulled in from the partition wall 11 side in the maintenance room 13 as described above, it is not necessary to perform work with a diver entering the narrow corner drop installation room 12, and water shielding by the corner drop 14c can be safely performed. It can be carried out. Further, when removing the corner drop 14c, the diving work becomes unnecessary by collecting the fixed anchor 146 before the channel 2 is filled with seawater.

[Fifth Embodiment]
FIG. 14 is a view showing a shaft 1d according to the water-impervious structure of the fifth embodiment. In the present embodiment, as in the first embodiment, the upper portion of the groove 121 is provided in a substantially vertical direction with a substantially constant width H. This width H is slightly larger (for example, about 10 cm) than the thickness of the corner drop main body described later. However, in the middle of the groove 121, as it goes downward, an inclination toward the front is provided on the rear door contact surface 121a, and the width H of the groove 121 decreases. The lower part of the groove 121 is substantially constant with a narrower width H than the upper part of the groove 121. This width H is slightly larger (for example, about 5 cm) than the thickness of the cornered body.

  FIGS. 15A and 15B are diagrams illustrating the installation of the corner drop 14d. FIG. 15A is a diagram illustrating the installation of the corner drop 14d, and FIG. 15B illustrates a state where the installation of the corner drop 14d is completed.

  In the present embodiment, as the corner drop 14d, one having a leaf spring 147 (spring member) attached to the rear surface of the substantially rectangular plate-shaped main body 141 is used. The leaf springs 147 are installed at two locations on the upper and lower sides of the main body 141. The protruding height of the leaf spring 147 is about 8 cm, and there is a slight margin (for example, about 2 cm) between the rear door contact surface 121 a and the leaf spring 147 in the upper part of the groove 121.

  In this embodiment, the both sides of the corner drop 14d are inserted into the grooves 121 on both sides of the corner drop installation chamber 12, and the corner drop 14d is suspended to the bottom using this as a guide. In the upper part of the groove 121, the corner drop 14d is smoothly lowered. However, in the lower part of the groove 121, the corner drop 14d is lowered while the leaf spring 147 is slightly crushed by the rear door contact surface 121a. It is pressed against the partition wall 11 by the restoring force of 147, and the water blocking rubber on the front surface comes into contact with the partition wall 11.

  Thus, a water shielding structure is formed in which the opening 111 is blocked by the corner drop 14d. The subsequent procedure is the same as in the first embodiment. The leaf spring 147 functions as a pressing material (pressing mechanism) that presses the corner drop 14 d against the partition wall 11.

  Also in this embodiment, as in the first embodiment, it is easy to perform water shielding by the corner dropping 14d in the shaft 1d. Further, by using the leaf spring 147 as a pressing member, it is possible to perform water shielding at low cost.

[Sixth Embodiment]
FIG. 16 is a view showing a corner drop 14e used in the water-impervious structure of the sixth embodiment. 17A shows a vertical section of the corner drop 14e, and FIG. 17B shows a horizontal section of the corner drop 14e. 17A is a cross section taken along the line CC in FIG. 17B, and FIG. 17B is a cross section taken along the line DD in FIG. 17A.

  The corner drop 14e is composed of a plurality of upper and lower units 140, and has a substantially rectangular plate shape as a whole. Each unit 140 is provided with a plurality of hollow portions 148 penetrating vertically, and the positions of the hollow portions 148 correspond to the upper and lower units 140. Further, at least one of the units 140 (the lowermost unit 140 in the example of FIG. 17A) is provided with a flow path 149 that allows the adjacent hollow portions 148 of the unit 140 to communicate with each other.

  The upper and lower units 140 are joined from the outside using bolts, nuts, or the like, and a lid 150 is provided on the lower surface of the lowermost unit 140 and the upper surface of the uppermost unit 140. Tubes 151 and 152 that pass through the lid 150 of the uppermost unit 140 and are inserted into the hollow portion 148 are also provided.

  18 and 19 are diagrams for explaining the installation of the corner drop 14e. In the present embodiment, the width H of the groove 121 of the corner dropping installation chamber 12 of the shaft 1e is substantially constant over the entire depth. This width H is slightly larger (for example, about 5 cm) than the thickness of the corner drop 14e.

  In the present embodiment, first, as shown in FIG. 18A, the unit 140 with the lowermost lid 150 is suspended by a crane or the like, and is fixed by a temporary fixing means (not shown) near the upper end of the corner dropping installation chamber 12. . At this time, an inflatable packer 153 (bag) is attached to the rear surface of the unit 140 in a deflated state. The packer 153 is installed on both side portions of the unit 140 inserted into the grooves 121 on both sides of the corner dropping installation chamber 12, similarly to the inclined metal fitting 142 of FIG. 3.

  Thereafter, as shown in FIG. 18B, the second stage unit 140 is suspended by a crane or the like and joined onto the lowermost unit 140. Then, as shown in FIG. 18C, the second stage unit 140 is fixed near the upper end of the corner dropping installation chamber 12 by temporary fixing means (not shown). Thereafter, the uppermost unit 140 is suspended by a crane or the like, and is joined onto the second-stage unit 140 as shown in FIG. The packer 153 is attached to this unit 140 as well as the lowermost unit 140. Each packer 153 is connected in advance with an air supply tube (not shown).

  Then, as shown in FIG. 19A, a lid 150 and the above-described tubes 151 and 152 are attached to the upper surface of the uppermost unit 140, and water is poured into the hollow portion 148 of each unit 140 via the tube 151. Then, air is exhausted from the tube body 152. Then, the hollow portion 148 is filled with the water 20, and a weight sufficient to suspend the corner drop 14e in water is obtained.

  After hanging the corner drop 14e to the bottom of the corner drop installation chamber 12 (more specifically, a position slightly above the bottom surface of the groove 121), high pressure air is sent to each packer 153 from the ground via an air pipe. As shown in 19 (b), the packer 153 is expanded to press the corner drop 14 e against the partition wall 11, and the water blocking rubber 143 on the front surface is brought into contact with the partition wall 11.

  Thus, a water shielding structure is formed in which the opening 111 is blocked by the corner drop 14e. The packer 153 functions as a pressing material (pressing mechanism) that presses the corner drop 14e against the partition wall 11 side.

  Thereafter, draining is performed in the same manner as described above, whereby the corner drop 14e is further pressed against the partition wall 11 due to the water pressure difference, and the water stop rubber 143 is crushed so that the water can be reliably blocked.

  After maintenance of the flow path 2 and the like, the drained flow path 2 and the like are filled with seawater again, the packer 153 is evacuated and deflated, and high-pressure air is sent from the tube body 152 to within the corner drop 14e. Water is drained from the tube 151. Then, since the corner drop 14e becomes light, it can be lifted easily. The corner drop 14 e can be sequentially removed from the uppermost unit 140 and removed when the corner drop 14 e is lifted to near the upper end of the corner drop installation chamber 12.

  Thereby, also in this embodiment, it becomes easy to perform the water-blocking by the corner drop 14e in the shaft 1e as in the first embodiment. In particular, in the present embodiment, when the flow path 2 and the opening 111 are large and a large corner drop is required, the corner drop 14e can be made up of a plurality of units 140 having the hollow portions 148, and the weight can be reduced. Easy to transport and install. At the time of water shielding, for example, the unit 140 can be hung while assembling to form one corner drop 14e. When the corner drop 14e is suspended, water can be poured into the hollow portion 148 to secure a sufficient weight to suspend the corner drop 14e. When the corner drop 14e is removed, the hollow portion 148 is drained to facilitate draining. Can be suspended.

  In the present embodiment, the use of the packer 153 as the pressing material enables inexpensive and reliable water shielding. Note that the corner drop pressing method using the packer 153 as the pressing material is also applicable to the fourth embodiment and the fifth embodiment. Conversely, the corner drop 14e of this embodiment can be pressed against the partition wall 11 in the same manner as in the fourth and fifth embodiments. Further, the corner drop main body of the first to third embodiments can be formed by being divided into units 140 in the same manner as described above.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.

1, 1a, 1b, 1c, 1d, 1e, 100: shaft 2, 200: flow path 11, 110: partition wall 12, 120: corner dropping installation chamber 13, 130: maintenance chambers 14, 14a, 14a, 14b, 14c, 14d, 14e, 300: Corner drop 20: Water 111, 1101: Open 121: Groove 121a: Door contact surface 140: Unit 141, 141a: Main body 142: Inclined metal fitting 143: Water stop rubber 144: Mounting material 145: Insert 146: Fixed anchor 147: leaf spring 148: hollow portion 149: flow path 150: lid 151, 152: tube 153: packer

Claims (11)

A water shielding structure in a shaft connected to a flow path,
A wall having an opening is provided inside the shaft,
In the space adjacent to the wall body, a corner drop is installed to close the opening,
On both sides of the space, grooves for inserting both sides of the corner drop are provided,
The water impervious structure, wherein the groove or the corner drop has a pressing mechanism used to press the corner drop against the wall body when the corner drop is installed.   The water-impervious structure according to claim 1, wherein an upper end of the corner drop is below a water surface in the shaft.   The water-blocking structure according to claim 1, wherein a water-stopping material is provided at a position surrounding the opening on the wall-side surface of the corner drop.   The water impervious structure according to any one of claims 1 to 3, wherein the door contact surface of the groove has an inclination with respect to a vertical direction as the pressing mechanism.   The water shielding structure according to claim 4, wherein the corner drop has an inclination corresponding to an inclination of the door contact surface.   The water blocking structure according to any one of claims 1 to 5, wherein the corner drop has a mounting portion for attaching a pulling material for drawing the corner drop to the wall as the pressing mechanism. .   In the corner drop, as the pressing mechanism, a pressing member for pressing the corner drop against the wall is attached to a surface opposite to the wall. Item 7. The water-blocking structure according to any one of Items 6.   The water-impervious structure according to claim 7, wherein the pressing member is a spring member.   The water-impervious structure according to claim 7, wherein the pressing material is an inflatable bag.   The water blocking structure according to any one of claims 1 to 9, wherein the corner drop comprises a plurality of upper and lower units having a hollow portion.   The water-impervious structure according to any one of claims 1 to 10, wherein the channel is a seawater intake channel or a water discharge channel in a power plant.

Images