Patent Number: 
Section: claims

1. A pit gate that is accommodated in a slot and that seals service water retained in the pit in a watertight manner, the pit gate comprising:a gate main body;a sealing member that is provided on a surface opposite to the slot in the gate main body and that seals between the gate main body and the slot in a watertight manner; anda pressing clamp that is provided in the gate main body and that moves the gate main body toward the sealing member side due to a weight of the gate main body itself, whereinthe pressing clamp includesa second gate-side pressing member that is shaped as a rod and that is provided so as to protrude from the gate main body along the horizontal direction, anda second slot-side pressing member that is in contact with the second gate-side pressing member and that is provided in the slot that faces a surface opposite from a surface on which the sealing member of the gate main body is provided, andthe second slot-side pressing member is formed in a wedge shape whose thickness becomes greater from the upper side toward the lower side in the vertical direction, so that a second slot-side inclined surface that is inclined toward the sealing member side from the upper side toward the lower side in the vertical direction is formed, andthe second gate-side pressing member comes into contact with the second slot-side inclined surface, so that the second gate-side pressing member moves the gate main body toward the sealing member side. 2. The pit gate according to claim 1, wherein the sealing member is formed so as to protrude toward the slot side in cross section. 3. The pit gate according to claim 1, whereinthe pressing clamp includes a first gate-side pressing member that is provided on a surface of the gate main body opposite from a surface on which the sealing member is provided, andthe first gate-side pressing member is formed in a wedge shape whose thickness becomes thinner from the upper side toward the lower side in the vertical direction, so that a first gate-side inclined surface that is inclined toward the sealing member side from the upper side toward the lower side in the vertical direction is formed. 4. The pit gate according to claim 1, whereinthe pressing clamp includesa third gate-side pressing member that is provided so as to protrude from the gate main body toward the lower side in the vertical direction, anda third slot-side pressing member that is in contact with the third gate-side pressing member and that is provided on a bottom portion of the slot, andthe third slot-side pressing member is formed in a wedge shape whose thickness becomes greater from the upper side toward the lower side in the vertical direction, so that a third slot-side inclined surface that is inclined toward the sealing member side from the upper side toward the lower side in the vertical direction is formed, andthe third gate-side pressing member comes into contact with the third slot-side inclined surface, so that the third gate-side pressing member moves the gate main body toward the sealing member side. 5. The pit gate according to 1, whereina plurality of the pressing clamps is provided at a predetermined distance in the vertical direction of the gate main body,the plurality of the pressing clamps includes a first pressing clamp, the second pressing clamp, and a third pressing clamp,the first pressing clamp includes a first gate-side pressing member that is provided on a surface of the gate main body opposite from a surface on which the sealing member is provided,the first gate-side pressing member is formed in a wedge shape whose thickness becomes thinner from the upper side toward the lower side in the vertical direction, so that a first gate-side inclined surface that is inclined toward the sealing member side from the upper side toward the lower side in the vertical direction is formed, andthe third pressing clamp includesa third gate-side pressing member that is provided so as to protrude from the gate main body toward the lower side in the vertical direction, anda third slot-side pressing member that is in contact with the third gate-side pressing member and that is provided on a bottom portion of the slot, andthe third slot-side pressing member is formed in a wedge shape whose thickness becomes greater from the upper side toward the lower side in the vertical direction, so that a third slot-side inclined surface that is inclined toward the sealing member side from the upper side toward the lower side in the vertical direction is formed, andthe third gate-side pressing member comes into contact with the third slot-side inclined surface, so that the third gate-side pressing member moves the gate main body toward the sealing member side. 6. The pit gate according to claim 5, wherein the first gate-side inclined surface, the second slot-side inclined surface, and the third slot-side inclined surface have the same inclination angle with respect to the horizontal plane. 7. The pit gate according to claim 5 wherein,the thickness direction of the gate main body is a direction in which a surface on which the sealing member is provided faces a surface opposite side on which the sealing member is provided, andthe second gate-side pressing member is provided closer to the other side on which the sealing member is provided with respect to the center in the thickness direction of the gate main body. 8. The pit gate according to claim 5, wherein the second slot-side pressing member and the third slot-side pressing member are provided in the slot that faces a surface opposite from a surface on which the sealing member of the gate main body is provided and are provided in the slot that faces the surface on which the sealing member of the gate main body is provided. 9. The pit gate according to claim 5, whereina plurality of the second pressing clamps is provided at a predetermined distance in the vertical direction of the gate main body,the second gate-side pressing member on the upper side in the vertical direction is formed such that the protruding length from the gate main body is greater than that of the second gate-side pressing member on the lower side in the vertical direction, andthe second slot-side pressing member on the upper side in the vertical direction is disposed on the outer side in the horizontal direction with respect to the gate main body than the second slot-side pressing member on the lower side in the vertical direction. 10. The pit gate according to claim 5, whereinthe gate main body includes a waveform member that has a wave shape and in which peak portions and valley portions are alternately formed from the upper side toward the lower side in the vertical direction, andthe waveform member is formed such that the pitch between the adjacent peak portions in the vertical direction is narrower toward the lower side in the vertical direction. 11. A pit equipment, comprising:a first pit;a second pit;a channel that connects the first pit and the second pit;a slot provided in the channel; andthe pit gate according to claim 1 accommodated in the slot. 12. A nuclear power facility comprising the pit equipment according to claim 11. 13. An installation method comprising installing the pit gate according to claim 1 in a pit equipment including a first pit, a second pit, a channel that connects the first pit and the second pit, and a slot provided in the channel, the installation method further comprising:installing, in a state in which the first pit, the second pit, and the channel are filled with the service water, by facing a surface on which the sealing member is provided, the pit gate in the slot on the first pit side or the second pit side from which the service water is supposed to be drained. 14. The installation method according to claim 13, further comprising:forming the first pit and the second pit by being depressed from a floor surface;fixing the pit gate to the floor surface via a spacer; andadjusting the height of the spacer in accordance with the protrusion state of the sealing member toward the slot side.