JP2014047533A - Box body for cofferdam, and cofferdam construction method using the same - Google Patents

Abstract

An object of the present invention is to provide a temporary closing box that can be efficiently installed and removed from underwater structures such as support piles and piers, and a temporary closing method using the same.
SOLUTION: A bottomed cylindrical box body 3 having an insertion hole 2 through which an underwater structure A is inserted in a bottom portion and installed so as to surround an outer peripheral portion of the underwater structure A, and an inner edge of the insertion hole 2 An annular water stop member 4 interposed between the underwater structure and the underwater structure A. The box body 3 is disposed so that an end edge thereof is in contact with the underwater structure A through the water stop member 4. A temporary closing box 1 having an openable / closable door 6 composed of one or a plurality of door members 5 and 5.
[Selection] Figure 1

Description

  The present invention relates to a temporary closing box for providing a dry working space in repairing / reinforcing a structure such as a pier or a support pile for a pier installed in water, and a temporary closing method using the same.

  Conventionally, in order to repair and reinforce structures such as bridge piers and pier support piles installed in water such as rivers and harbors, steel sheet piles and steel pipe sheet piles are erected around the underwater structures. A temporary closing method is widely used in which the work is performed while the surrounding space is enclosed and the enclosed internal space is in a dry state.

  However, in the temporary closing method using steel sheet piles and steel pipe sheet piles as described above, the work space on the surface of the water is limited by the superstructure, so it takes a lot of time and money to place and remove the steel sheet piles, etc. There was a problem.

  Therefore, a steel temporary closing box is manufactured in advance at the ground of a factory or work site, and it is transported and towed to the work site and installed on the outer periphery of the underwater structure. A temporary closing method for forming a dry environment by discharging water in the body has been proposed (see, for example, Patent Document 1).

  Such a temporary cut-off method includes a bottomed cylindrical box body having an insertion hole through which the underwater structure is inserted at the bottom, a rubber packing that stops the gap between the inner edge of the insertion hole and the underwater structure, etc. A temporary closing box is used, and the temporary closing box is installed in water with the upper end protruding above the water surface, and the water in the temporary closing box is drained. It is known that a dry environment is formed in a temporary closing box by (drying up).

  As shown in FIGS. 9 and 10, the box body 100 is formed into a bottomed cylindrical shape having a pair of half-cut boxes 102, 102 joined via hinges 101 arranged on the outer peripheral surface portion. The two halves 102 and 102 are opened in the open state and placed on the outer periphery of the underwater structure A. Then, the two halves 102 and 102 are closed, and the joint is submerged by a diver. The box body 100 is assembled by tightening with bolts.

  When removing the temporary closing box, a diver removes the bolts so that the two half-split boxes 102 and 102 are opened via the hinge 101, and the box body 100 is opened with a crane or the like in that state. It is designed to be lifted.

Japanese Patent Laid-Open No. 09-189043

  However, in the conventional technology as described above, when the box body is formed of a pair of half-cut boxes, it is difficult to open and close the heavy half-boxes in water, and the weight of the half boxes increases. There is a problem that the weight of the entire box body is increased because a large number of hinge members and bolt fastening members are required to enable the opening and closing operation between the split bodies. Or it was necessary to perform dismantling by the hand of a diver underwater, and there was a problem that workability and work efficiency were bad.

  Therefore, it is desirable that the above-mentioned bottomed cylindrical box body can be installed or removed by sliding with respect to the underwater structure without performing the assembling work of the box body in water.

  However, in a structure in which the space between the insertion hole at the bottom of the box body and the underwater structure is stopped by a water stop member, the water in the temporary closing box is discharged to form a dry environment. A pressure difference occurs between the inside and outside, and the water-stopping member such as packing is strongly tightened toward the inside of the box, which provides a high water-stopping effect, but repair work is completed and the temporary-closing box is removed. At that time, the tightening force by the water-stopping member hinders the removal, and there is a possibility that the relative sliding movement of the temporary closing box with respect to the underwater structure may be hindered.

  Moreover, the removal of the tightly-tightened water-stopping member has to be performed by a diver's hand underwater, which has a poor work efficiency and has been an obstacle to shortening the work period.

  In addition, when a portion where the cross-sectional area of the underwater structure has increased due to repair work or a protrusion that protrudes outward from the outer periphery of the underwater structure is formed, the bottom of the box body comes into contact with that portion. There was a problem that the temporary closing box could not be removed while maintaining the bottomed cylindrical shape.

  Then, in view of such a conventional problem, the present invention aims to provide a temporary closing box that can be efficiently installed and removed from underwater structures such as support piles and piers, and a temporary closing method using the same. It was made as.

  The feature of the invention described in claim 1 for solving the conventional problem as described above is that the bottom portion has an insertion hole through which the underwater structure is inserted, and is installed so as to surround the outer peripheral portion of the underwater structure. A box body for temporary closing comprising a bottomed cylindrical box body and an annular water stop member interposed between an inner edge of the insertion hole and the underwater structure. There is provided an openable openable / closable door comprising one or a plurality of door members arranged such that an edge portion comes into contact with the underwater structure via the water blocking member.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the box body includes a widened opening portion into which the door member is fitted, and the door member has an opening edge portion of the widened opening portion. It is to be supported to be opened and closed via a hinge.

  According to a third aspect of the present invention, in addition to the configuration of the second aspect, an opening-side inclined portion inclined toward the inner side of the box is formed on the inner edge of the enlarged opening portion, and the openings of the outer edges of the door members The door-side inclined portion that fits with the opening-side inclined portion is formed at the joining edge portion that faces the side inclined portion.

  According to a fourth aspect of the present invention, in addition to the configuration of the second or third aspect, the hinge is rotatably connected at one end to a door-side rotation shaft supported by the open / close door, and the other end is the open / close It is provided with a crank member rotatably connected to a window side rotation shaft supported by the window opening edge.

  According to a fifth aspect of the present invention, in addition to the configuration of the first to third or fourth aspects, the water stop member includes a plurality of water stop pieces each having an annular shape, and an inner edge portion of the insertion hole. And a holding portion for holding each water stop piece slidably in the hole axis direction.

  According to a sixth aspect of the present invention, in addition to the structure of the first to fourth or fifth aspects, the insertion hole is formed in a shape having a tapered portion inclined toward the inner side of the box at the inner edge, and the water blocking member Is formed in a wedge shape having a tapered surface portion fitted in the tapered portion on the outer peripheral surface portion.

  A feature of the invention described in claim 7 is that a bottomed cylindrical box main body having an insertion hole through which an underwater structure is inserted in a bottom portion and installed so as to surround an outer peripheral portion of the underwater structure; Using a pre-manufactured temporary closing box having an annular water stop member interposed between the inner edge of the insertion hole and the underwater structure, the underwater structure is inserted into the insertion hole. The box body is installed at a required position in the water in a state where the water is stopped between the insertion hole and the underwater structure by the water stop member, and then the water in the box body is discharged to form an underwater structure. In the temporary closing method using a temporary closing box for forming a dry space around an object and performing an operation in the dry space, the box body has an end edge portion through the water stop member and the underwater structure. An openable openable / closable door comprising one or a plurality of door members arranged to abut against an object After working in the dry space is completed, open the door, is to remove along the underwater structure said box-body in that state.

  As described above, the temporary closing box according to the present invention has a bottomed cylindrical shape that has an insertion hole through which an underwater structure is inserted at the bottom, and is installed so as to surround the outer periphery of the underwater structure. A temporary closing box having a box body and an annular water stop member interposed between an inner edge of the insertion hole and the underwater structure, wherein the box body has an end portion that is the water stop By providing an openable openable / closable door composed of one or a plurality of door members disposed so as to contact the underwater structure via the member, the open / close door is removed when the temporary closing box is removed after the work is completed. By opening, the water stop member can be preferably detached from the underwater structure, and the water stop member can be prevented from obstructing the removal work of the box body.

  Moreover, even when a portion protruding from the outer peripheral surface of an existing underwater structure is formed by repair work or the like, the box body bottom does not come into contact with the protruding portion, and the box body is disassembled in water. It can be removed without any problem and work efficiency is good.

  In the present invention, the bottom of the box body is provided with an enlarged opening part into which the door member is fitted, and the door member is supported by an opening edge of the enlarged opening part so as to be opened and closed via a hinge. The opening / closing door can be suitably opened / closed, and an opening having a larger opening area than the insertion hole can be secured by opening / closing the opening / closing door.

  Further, in the present invention, an opening-side inclined portion that is inclined toward the inner side of the box is formed at the inner edge of the enlarged opening portion, and the opening-side inclined portion is opposed to the opening-side inclined portion of each door member outer edge. By forming the door-side inclined portion that fits with the inclined portion, when each door member is urged in the closing direction due to the pressure difference between the inside and outside of the box that occurs during dry-up, a high proof strength is provided for the urging force. The door member can be prevented from rotating inside the box.

  Furthermore, in the present invention, the hinge is rotatably connected at one end to a door-side rotating shaft supported by the opening / closing door, and the other end is rotatable at a window-side rotating shaft supported by the opening / closing window opening edge. By providing the connected crank member, the opening and closing operation of the opening and closing door can be performed smoothly.

  In the present invention, the water stop member includes a plurality of water stop pieces each having an annular shape, and holds each water stop piece slidably in the axial direction of the hole at the inner edge of the insertion hole. By providing the part, the water stop piece can be held in a state of being detached from the underwater structure, and the installation operation can be performed smoothly.

  Further, in the present invention, the insertion hole is formed in a shape having a tapered portion inclined toward the inner side of the box at an inner edge, and the water stop member is a wedge having a tapered surface portion fitted into the tapered portion on an outer peripheral surface portion. By being formed into a shape, a high water stop effect can be obtained by utilizing the pressure difference between the inside and outside of the box body during dry-up.

  The temporary closing method using the temporary closing box according to the present invention, as described above, has an insertion hole through which the underwater structure is inserted at the bottom, and is installed so as to surround the outer periphery of the underwater structure. A pre-manufactured temporary closing box comprising a bottomed cylindrical box body, and an annular water stop member interposed between an inner edge of the insertion hole and the underwater structure, The box body is installed at a required position in water in a state where the underwater structure is inserted through the insertion hole, and water is stopped between the insertion hole and the underwater structure by the water stop member. In the temporary closing method using a temporary closing box that discharges water in the box body to form a dry space around the underwater structure and performs the work in the dry space, the box body has an edge portion. One or a plurality of doors arranged so as to abut against the underwater structure via the water stop member It is provided with an openable / closable door made of a material, and after the work in the dry space is completed, the door is opened, and in this state, the box body is removed along the underwater structure, so that the water can be stopped suitably. It is possible to prevent the water-stopping member from obstructing the removal work of the box body by removing the member from the underwater structure, and to secure an opening having a larger opening area than the insertion hole. Since it does not come into contact with the portion protruding from the outer peripheral surface of the structure, it is not necessary to dismantle the box body in water, and the removal work can be performed efficiently and the construction period can be shortened.

It is a longitudinal cross-sectional view which shows an example of the use condition of the box for temporary deadlines concerning this invention. It is a top view of a box main body same as the above. It is an AA line sectional view same as the above. It is a BB line sectional view same as the above. It is a partial expanded longitudinal cross-sectional view which shows the other Example of the box for temporary deadlines concerning this invention. It is a disassembled perspective view which shows the water stop member in FIG. It is a longitudinal cross-sectional view which shows the condition of each process of the box installation work in the temporary closing method using the temporary closing box which concerns on this invention. It is a longitudinal section showing the situation of each process of box removal work same as the above. It is a longitudinal cross-sectional view which shows an example of the conventional box for temporary deadlines. It is a top view same as the above.

  Next, an embodiment of the temporary closing box according to the present invention will be described based on the embodiment shown in FIGS. In the figure, reference numeral A denotes an underwater structure such as a steel pipe pile for supporting a pier standing in water, and reference numeral 1 denotes a temporary closing box installed in the underwater structure A.

  The temporary closing box 1 has a bottomed cylindrical box body 3 having an insertion hole 2 through which the underwater structure A is inserted at the bottom, and is interposed between the inner edge of the insertion hole 2 and the outer periphery of the underwater structure A. And an annular water stop member 4 that is installed in a state in which the upper end opening of the box body 3 protrudes from the water surface B with respect to the underwater structure A, and discharges the water in the box body 3 (dry up). Thus, a dry space can be formed around the underwater structure A.

    In addition, the temporary closing box 1 can be opened and closed including door members 5 and 5 that are arranged so that the end edge portion abuts the outer peripheral surface of the underwater structure A via the water stop member 4 when closed. The open / close door 6 is provided and the water stop member 4 can be detached from the underwater structure A by opening the open / close door 6, and an opening larger than the insertion hole 2 can be secured at the bottom of the box body 3. It has become.

  As shown in FIGS. 1 and 2, the box body 3 is formed in a bottomed cylindrical shape having a polygonal plate-like bottom plate portion 7 and a peripheral wall portion 8 having a shape raised from the peripheral edge of the bottom plate portion 7. The insertion hole 2 is formed at the center of the bottom plate portion 7.

  The box body 3 is provided with a suspension member 10 to which the tip of a wire rope 9 fed from a crane is fixed at the upper end, and can be suspended by the crane.

  The box body 3 is composed of steel peripheral wall units 11, 11... Formed in a shape obtained by dividing a polygonal cylinder into vertical sections, and a polygonal flat plate-shaped steel bottom plate unit 12. The units are assembled in advance in a work area set on the water of a factory or work site in a state where water is stopped from each other. Moreover, each surrounding wall part unit 11,11 ... can be isolate | separated in a cylinder axis direction.

  The box body 3 is not limited to the above-described structure, and the bottom plate portion 7 and the peripheral wall portion 8 may be integrally formed of a steel material, and the bottomed cylindrical shape is vertically divided in half. It may be configured by a pair of halved boxes, and both the halved boxes can be opened and closed via hinges.

  An opening / closing water inlet 13 for introducing external water into the box body 3 is formed in the peripheral wall portion 8 of the box body 3, and the water inlet 13 is opened and closed by an opening / closing valve (not shown). It has become.

  Further, the box body 3 includes a temporary fixing portion 15 including a pair of temporary fixing beam members 14 and 14 arranged so as to cross each other, and both ends of each temporary fixing beam member 14 and 14 are peripheral wall portions, respectively. 8 is fixed to the inner surface of the underwater structure A, and the temporary fixing portion 15 is supported on the upper end of the underwater structure A so that the temporary cutoff box 1 can be installed at a required position of the underwater structure A. .

  A plurality of positioning guide members 16, 16... Arranged in a ring shape project from the central lower surface portion of the temporary fixing portion 15, that is, the lower surface portion of the portion where both the temporary fixing beam members 14, 14 intersect. The center position of the underwater structure A and the box body 3 is adjusted by fitting the upper end of the underwater structure A inside the positioning guide members 16, 16.

  Further, the box body 3 is provided with a pair of lifting prevention beam members 17 and 17 which are fixed in an arrangement between the inner side surfaces which intersect with each other and face each other at the inner edge of the upper end opening. .. For temporary fastening installed in the water by connecting the lower ends of the lifting prevention members 18, 18... Made of chains suspended from the materials 17, 17 to the upper ends of the underwater structure A via hooks 19. The box 1 is prevented from being lifted by buoyancy.

  Further, if necessary, the rocking prevention beam members 20, 20... Are bridged between the outer peripheral surface portion of the underwater structure A and the inner peripheral surface portion of the peripheral wall portion 8 of the box body 3. By fixing to the outer peripheral surface of the underwater structure A and the inner peripheral surface of the peripheral wall 8, the temporary closing box 1 can be installed in the underwater structure A in a stable state.

  On the other hand, the bottom plate portion 7 constituting the bottom portion of the box body 3 is formed with a rectangular widened opening portion 21 penetrating in the thickness direction of the bottom plate portion 7, and a pair of door members 5, 5 are formed in the widened opening portion 21. The door members 5, 5 are supported by the opening edge portion of the enlarged opening portion 21 through the hinge 22 so as to be openable and closable while the outer edge is fitted to the inner edge of the enlarged opening portion 21.

  The widened opening portion 21 includes an opening-side inclined portion 23 that is inclined toward the inner side of the inner peripheral portion, that is, the opening-side inclined portion 23 that is inclined so as to approach the opposite side of the inner peripheral portion as the inner side proceeds. Is formed in a square frustum hole shape with a large opening area and a narrow opening area inside the box.

  The opening area of the widened opening portion 21 is determined in consideration of an expected overhanging width of a portion projecting outward from the outer peripheral surface of the existing underwater structure A due to repair work or the like, and does not interfere with the overhanging portion. Formed as follows.

  Each door member 5, 5 is formed in a rectangular plate shape in accordance with the shape of the enlarged opening portion 21, and a recessed portion 2 a having a shape obtained by dividing the insertion hole 2 into two end portions that are abutted with each other through the insertion hole 2. In addition, when both door members 5 and 5 are closed, a quadrangular pyramid shape is formed, the enlarged opening 21 is closed, and both concave portions 2 a and 2 a form the insertion hole 2.

  In addition, the door-side inclined portion 24 having a shape inclined in accordance with the inclination of the opening-side inclined portion 23 facing each other is formed on the peripheral edge portion of each door member 5, 5. Both inclined parts 23 and 24 are abutted with each other.

  It should be noted that a water blocking material 25 such as rubber packing is interposed between the inner edge of the enlarged opening 21 and the outer edges of the door members 5 and 5 facing each other. The water between the members 5 and 5 is stopped.

  Further, by providing an inclined portion on the inner edge of the widened opening 21 and the outer edge of the door members 5 and 5 that face each other in abutting arrangement, and a structure in which a water stop material 25 is interposed between the opposed surfaces, dry-up is achieved. When the door members 5 and 5 are urged in the closing direction due to a pressure difference between the inside and outside of the box, a high proof stress can be exerted against the urging force.

  As shown in FIGS. 3 and 4, each door member 5, 5 is pivotally joined to the outer opening edge of the widened opening 21 via the hinge 22 at the lower surface of the end opposite to the recess 2 a. The door 6 is opened and closed by rotating the door members 5 and 5 downward through the hinges 22.

  A pair of fixing members 26 and 26 are respectively fixed to the upper surface of the peripheral edge of each door member 5 and 5 and the inner opening edge of the widened opening 21 to form a rotation restricting means. 26 is connected by a connecting member 27 such as a connecting pin so that the rotation of the door members 5 and 5 can be restricted.

  The hinge 22 may have a general hinge shape as shown in FIG. 3, but as shown in FIG. 5, one end of the hinge 22 is rotatably connected to a door-side rotating shaft 28 supported by the door members 5 and 5. The other end may be provided with a crank member 30 that is rotatably connected to the opening-side rotating shaft 29 supported by the opening edge of the widened opening 21. In that case, when the door members 5 and 5 are opened, as shown in FIG. 5B, after the door members 5 and 5 move along the inclination of the inclined portions 23 and 24, as shown in FIG. It is configured to rotate around the opening side rotation shaft 29.

  The insertion hole 2 is formed in a shape having a tapered portion 31 that is inclined toward the inner side of the inner peripheral edge, that is, is inclined so as to approach the opposite side of the inner peripheral edge as it goes to the inner side of the box. Is inserted in a wedge shape toward the inner side of the insertion hole 2 to stop the gap between the inner edge of the insertion hole 2 and the underwater structure A.

  The water stop member 4 has an annular shape in which a through-hole 32 through which the underwater structure A passes is formed in the center, and includes a tapered surface portion 33 that is inclined in accordance with the shape of the tapered portion 31 of the insertion hole 2 on the outer peripheral portion. The tapered surface portion 33 is fitted inside the tapered portion 31 of the insertion hole 2, thereby closing the gap between the inner edge of the insertion hole 2 and the outer periphery of the underwater structure A to stop water. .

  Further, since the water stop member 4 has a wedge-like shape inserted into the insertion hole 2, the compression force received from the inner edge of the insertion hole 2 and the outer surface of the underwater structure A due to the pressure difference generated inside and outside the box during dry-up, that is, It is press-fitted toward the inside of the box, and a high water-stopping effect is obtained.

  This water stop member 4 is constituted by a plurality of water stop pieces 34, 34... Having elasticity and water impermeability, such as a rubber material having an annular shape, and each of the water stop pieces 34, 34. The water-stopping pieces 34, 34... Are compressed between the inner edge of the insertion hole 2 and the outer surface of the underwater structure A by being fitted into the insertion hole 2 in a wedge shape, and the water-stopping pieces 34, 34 adjacent to each other. The circumferential direction joining end faces of ... are abutted in a compressed state.

  In addition, the inner edge portion of the insertion hole 2 includes a holding portion 35 that holds the water stop pieces 34, 34... In a movable manner, and the water stop pieces 34, 34. And a position where it can be removed from the insertion hole 2. Each of the water stop pieces 34, 34... Is previously attached with a wire (not shown) so that the wire can be pulled up from the lower end portion of the holding portion 35 and fitted into the insertion hole 2. It has become.

  The holding part 35 has an inclined shape so as to be continuous with the insertion hole 2 and has a guide part 36 whose lower end protrudes from the lower surface of the bottom plate part 7 and a retaining part 37 formed in a flange shape at the lower end of the protruding part. When the open / close door 6 is open, it is divided into holding part divided bodies 35a and 35a in accordance with the door members 5 and 5, respectively.

  When the door 6 is closed, the temporary closing box 1 configured in this way is formed with an insertion hole 2 at the bottom and the underwater structure A is inserted through the insertion hole 2 underwater. While being able to be installed so as to surround the structure A, the water stop member 4 is interposed between the inner edge of the insertion hole 2 and the underwater structure A, and a dry space can be formed in the box body 3.

  On the other hand, when the open / close door 6 is opened, the water stop member 4 is detached from the underwater structure A, so that the water stop member 4 does not hinder the movement of the box body 3 and the insertion hole 2 Since a wider opening is secured, a portion where the cross-sectional area of the underwater structure A formed by repair work or the like is increased, or a protruding portion protruding outward from the outer periphery of the underwater structure A is Without interfering, the box body 3 can be installed or removed while maintaining the bottomed cylindrical shape.

  Next, the temporary closing method using the temporary closing box 1 as described above will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the structure similar to the above-mentioned Example.

  First, as an advance preparation for the work, as shown in FIG. 7A, the upper end height of the existing underwater structure A is measured, and the hook hole 19 is engaged with the upper end of the underwater structure A. 40, 40 ... are formed.

  Moreover, the preparatory work of the pre-manufactured box 1 is performed.

  In this preparatory work, the peripheral wall units 11, 11,... And the bottom plate unit 12 manufactured in advance at the factory are carried into the work site, assembled in the work area on the ground, and the insertion hole 2 is formed at the bottom. The bottomed cylindrical box body 3 is formed.

  Further, the position of the temporarily fixing beam members 14 and 14 constituting the temporary fixing portion 15 is adjusted and fixed to the box body 3 based on the measured upper end height of the underwater structure A, and the upper end of the box body 3 is fixed. The beam materials 17 and 17 for preventing lifting are fixed to the frame. The open / close door 6 is in a closed state, and both the fixing members 26, 26 are connected by a connecting member 27 such as a connecting pin so that the rotational movement of the door members 5, 5 is restricted.

  Further, the water stop pieces 34, 34... Are held in a state where they are located on the lower end side of the holding portion 35.

  When the preparation for the temporary closing box 1 is completed, the temporary closing box 1 is lifted by a crane as shown in FIG. 7B, and the position of the insertion hole 2 is adjusted to the position of the underwater structure A. In this state, the temporary closing box 1 is lowered to a required position, that is, a position where the temporary fixing portion 15 is supported by the upper end of the underwater structure A.

  In that case, since the water stop member 4 does not interfere with the underwater structure A because each water stop piece 34, 34... Is positioned at the lower end of the holding portion 35, the temporary closing box 1 can be easily lowered. Can do.

  Further, the center position of the box body 3 is positioned with respect to the center position of the underwater structure A by being guided by the positioning guide members 16, 16.

  Next, hooks 19 attached to the lower ends of the lifting prevention members 18, 18... Such as chains suspended from the lifting prevention beam members 17, 17 are locked in the locking holes 40. By tensioning 18, 18 ..., the box body 3 is fixed to the underwater structure A, and the temporary closing box 1 installed in water is prevented from being lifted by buoyancy.

  Then, as shown in FIG. 7 (d), the swing prevention beam members 20, 20... Are installed while adjusting the relative positional relationship between the box body 3 and the underwater structure A by a diver as necessary. Then, the installation of the box body 3 is completed.

  After the installation of the box body 3 is completed, the water-stopping pieces 34, 34... Are lifted from the lower end of the holding portion 35 by wires, and are fitted into the insertion holes 2 in a wedge shape to be formed of the water-stopping pieces 34, 34. The water stop member 4 is interposed between the inner edge of the insertion hole 2 and the outer surface of the underwater structure A, and the gap between the inner edge of the insertion hole 2 and the underwater structure A is stopped.

  After this water stop operation is completed, as shown in FIG. 7 (e), the water in the box body 3 is discharged to the outside using the submersible pump 41 installed at the bottom of the box body 3, and the inside of the box body 3 A dry space is formed. In the figure, reference numeral 42 denotes a drain hose for discharging water in the box body 3.

  By forming the dry space in the box body 3 in this way, a pressure difference is generated inside and outside the box, and the direction in which the compressive force received by the water stop member 4 from the inner edge of the insertion hole 2 and the outer surface of the underwater structure A is increased by this pressure difference. That is, it is press-fitted toward the inner side of the box, and a high water stop effect is obtained.

  Further, the pressure difference causes the door members 5 and 5 to be biased toward the inner side of the box, thereby compressing the water stop material 25 interposed between the enlarged opening 21 and the door members 5 and 5, thereby increasing the high stoppage. Water effect can be obtained.

  In this dry environment, as shown in FIG. 8 (f), work on the underwater structure A, for example, mounting work of the bracket 43 having a shape projecting in the pile radial direction, Install the studs that protrude from

  As described above, when a portion having an increased cross-sectional area of the underwater structure A or a protruding portion is formed, the bottom portion of the case body 3 interferes with the portion, so that the bottomed tubular shape is maintained while the bottomed cylindrical shape is maintained. Body 1 cannot be removed.

  Therefore, after the work in the dry space is completed, the temporary closing box 1 is removed as follows.

  First, after removing the connecting member 27 such as a connecting pin for connecting both the fixing members 26 and 26 and releasing the rotation restriction of the door members 5 and 5, the water inlet 13 formed in the peripheral wall portion 8 of the box body 3. Is opened, and external water is poured into the box body 3.

  When the water injection operation is completed, as shown in FIG. 8 (h), the swing prevention beam members 20, 20 are removed by the divers and the lifting prevention members 18, 18. The box body 3 is removed from the underwater structure A, and the wire rope 9 is attached to the suspension member 10 to lift the temporary closing box 1 with a crane.

  At that time, the water stop member 4 is fitted in a wedge shape in the insertion hole 2 and is strongly pressed due to the pressure difference between the inside and outside of the box at the time of dry-up. A force in the shearing direction is applied to the contact surface portion between the outer peripheral surface and the water blocking member 4, and the door members 5, 5 are rotated by the shearing direction force and its own weight, and the opening / closing door 6 is opened.

  When the opening / closing door 6 is thus opened, the water stop pieces 34, 34... Constituting the water stop member 4 are detached from the underwater structure A, and the enlarged opening 21 is opened. An opening having a wide opening area is secured.

  Then, the temporary closing box 1 is further lifted with the open / close door 6 open, and the temporary closing box 1 is removed. In this case, the widened opening 21 is opened, and an opening having a wide opening area is secured by the insertion hole 2, so that the portion protruding from the outer peripheral surface of the underwater structure A such as the bracket 43 is the bottom of the box body 3. Since it does not contact, it can raise along the underwater structure A, maintaining a bottomed cylindrical shape, without disassembling a box in water.

  Further, when there are a plurality of underwater structures A to be worked, as shown in FIG. 8 (j), the door members 5 and 5 are closed in a state of being placed on the assembly base 44 installed on the ground. In addition, the fixing members 26, 26 are connected by connecting pins to restrict the rotation of the door members 5, 5, and the water stop pieces 34, 34 ... are rearranged on the lower end side of the holding portion 35. Repeat the above operation.

  In the above-described embodiment, a description has been given of a door provided with a double door opening / closing door 6 constituted by a pair of door members 5 and 5 supported on the bottom of the box body 3 via hinges 22. , 5 may be provided with a sliding door type opening / closing door 6 that is slidably supported on the bottom plate portion 7 in the radial direction of the insertion hole 2.

  In the above-described embodiment, the bottom plate portion 7 is provided with the enlarged opening portion 21 and the door members 5 and 5 are fitted in the enlarged opening portion 21. The door members 5 and 5 may be configured to open and close the entire bottom plate.

  Further, in the above-described embodiment, the example in which the opening / closing door 6 is configured by the pair of door members 5 and 5 has been described. However, the number of the door members 5 and 5 is not limited to this, and the number of door members 5 and 5 is a plurality of three or more. Alternatively, the opening / closing door may be constituted by one door member, and only a part of the bottom plate portion around the underwater structure A may be opened / closed.

  Further, in the above-described embodiment, the example in which the box body 3 is formed in a bottomed cylindrical shape with the upper end opened has been described. However, the upper end of the box body 3 is closed with a top plate, and the entire box body 3 is installed in water. It may be one that can be made.

  Furthermore, although the above-mentioned Example demonstrated the example which suspends the box main body 3 with the crane etc. in the state assembled in the bottomed cylinder shape, and installed in the underwater structure A, the box body 3 is attached to the underwater structure A. The installation method is not limited to the above-described method. For example, the box body 3 is configured with a pair of half-boxes joined so as to be openable and closable via hinges, and both halves are opened around the hinges. When the box body 3 is assembled by closing both halved boxes and then removing the box body 3, the door 6 is opened and closed. May be opened and lifted while maintaining the bottomed cylindrical shape.

  As for the installation of the box body 3, the installation work is performed with the opening / closing door 6 open, and after the installation of the box body 3 to the underwater structure A is completed, the opening / closing door 6 is closed and the box body 3 is opened and closed. You may make it interrupt.

A Underwater structure B Water surface 1 Temporary cutoff box 2 Insertion hole 3 Box body 4 Water stop member 5 Door member 6 Open / close door 7 Bottom plate portion 8 Perimeter wall portion 9 Wire rope 10 Suspension member 11 Perimeter wall unit 12 Bottom plate portion unit 13 Water injection port 14 Temporary fixing beam material 15 Temporary fixing portion 16 Positioning guide member 17 Lifting prevention beam material 18 Lifting prevention member 19 Hook 20 Oscillation prevention beam material 21 Wide opening portion 22 Hinge 23 Opening side inclined portion 24 Door side Inclined portion 25 Water-stopping material 26 Fixing member 27 Connecting member 28 Door-side rotating shaft 29 Opening-side rotating shaft 30 Crank member 31 Tapered portion 32 Through-hole 33 Tapered surface portion 34 Water-stopping piece 35 Holding portion 36 Guide portion 37 Retaining portion

Claims (7)

The bottom portion has an insertion hole through which the underwater structure is inserted, and includes a bottomed cylindrical box body installed so as to surround an outer peripheral portion of the underwater structure, an inner edge of the insertion hole, and the underwater structure. In the temporary closing box provided with an annular water stop member interposed therebetween,
The box body is provided with an openable openable / closable door composed of one or a plurality of door members arranged such that an edge portion contacts the underwater structure via the water stop member. Deadline box.   The temporary housing according to claim 1, further comprising an enlarged opening portion into which the door member is fitted at the bottom of the box body, wherein the door member is supported by an opening edge of the enlarged opening portion so as to be opened and closed via a hinge. Deadline box.   An opening-side inclined portion that is inclined toward the inner side of the box is formed at the inner edge of the widened opening, and the opening-side inclined portion is fitted to the joint edge of each door member outer edge that faces the opening-side inclined portion. The temporary closing box according to claim 2, wherein a door-side inclined portion is formed.   The hinge includes a crank member having one end rotatably connected to a door-side rotating shaft supported by the opening / closing door and the other end rotatably connected to a window-side rotating shaft supported by the opening / closing window opening edge. The box for temporary deadlines according to claim 2 or 3 provided.   The water stop member includes a plurality of water stop pieces each having an annular shape, and includes a holding portion that holds the water stop pieces slidably in the hole axis direction at an inner edge portion of the insertion hole. The box for temporary deadlines as described in 1-3 or 4.   The insertion hole is formed in a shape having a tapered portion inclined toward the inner side of the box at the inner edge portion, and the water stop member is formed in a wedge shape having a tapered surface portion fitted in the tapered portion on an outer peripheral surface portion. The temporary closing box according to claim 1 or 4. The bottom portion has an insertion hole through which the underwater structure is inserted, and includes a bottomed cylindrical box body installed so as to surround an outer peripheral portion of the underwater structure, an inner edge of the insertion hole, and the underwater structure. Using a pre-manufactured box for temporary closing, which is provided with an annular water stop member interposed therebetween,
The box body is installed at a required position in water in a state where the underwater structure is inserted through the insertion hole, and water is stopped between the insertion hole and the underwater structure by the water stop member. In the temporary closing method using a temporary closing box that drains the water in the box body to form a dry space around the underwater structure and performs the work in the dry space,
The box body is provided with an openable openable / closable door comprising one or a plurality of door members arranged such that an edge portion contacts the underwater structure via the water stop member.
After the work in the dry space is completed, a temporary closing method using a temporary closing box that opens the door and removes the box body along the underwater structure in that state.

Images