JP2013230818A - Water tank and method for repairing water tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a water tank and a repair method which are suitable, particularly, for repair of an existing concrete water tank regarding a method for repairing a leaking water tank.SOLUTION: A plurality of water-tight sheets cut into a predetermined size are joined together or a water-tight sheet is folded to form a bag body large enough to be attached to an inner surface (bottom surface and inner wall surface) of an existing concrete skeleton forming a water tank. The bag body is folded and put into the existing concrete skeleton, and then, the sheet serving as the bottom of the bag body is spread inside the skeleton. A frame body large enough to be attached to the inside of the bag body is assembled on the spread bag bottom. The sheets serving as the sidewalls of the bag body are lifted along the outer peripheral surface of the frame body and the upper edges thereof are locked to the upper edge of the frame body with ropes or metal fittings.

Description

  The present invention relates to a water tank provided with a concrete housing and a repair method for a water tank in which water leakage has occurred due to cracks in the concrete housing.

There are many old fire-proof water tanks made of cast-in-place concrete that has been built for more than 25 years, and many tanks leak water due to concrete cracks. This type of aquarium has a rectangular shape with an area of about 24 m ² and a depth of about 2 m. There are many things without a lid, and there are fences around them, but there is a risk that children may get inside. The one with the lid is provided with a manhole for checking the inside.

  Water tanks that are leaking require renovation work to prevent leaks, but those that do not have lids are also requested to be covered. Also, there is a desire to break down the old and severely painful ones and install a new tank. However, construction costs are high for new construction on site. In addition, in the new construction with a certified secondary product (concrete block), there is a problem that the block becomes large, so that it cannot be carried into the installation location or installed.

  Water tanks that have leaked water are currently repaired by applying waterproof mortar to the inner surface (bottom surface and inner wall surface) of the concrete body that forms the water tank, applying polyester resin or its FRP, or lining it, cracking concrete There are a method of filling an epoxy resin and a method of attaching a bag-like vinyl chloride sheet to the inner surface.

  Among these methods, the method of applying waterproof mortar has a short life of the repaired water tank, and water leakage often recurs in several years. Also, with the method of resin application, lining, filling, etc., it is difficult to perform construction if the inner surface of the water tank is not dried at the time of construction, so it takes time to drain the water and dry it. There are problems such as delay.

  On the other hand, water tanks having a resin sheet bag such as a vinyl chloride sheet have been proposed in various structures. For example, Patent Document 1 proposes a structure in which a bag body is bonded to a resin or metal bonded body fixed to a concrete frame with a fixing bracket, and Patent Document 2 discloses a frame block made of a steel rod. There has been proposed a fire prevention water tank in which a bag body is held by a steel rod connected to a casing formed by connecting the two. In Patent Document 3, the bag body is fastened to the housing with a hook-and-loop fastener, and Patent Document 6 also shows that the bag body is moored with a hook-and-loop fastener or a hook. Moreover, in the fire prevention water tank of patent document 4, the bag body of the resin sheet is adhere | attached with the adhesive agent apply | coated to the appropriate location of the inner surface of a concrete housing. Furthermore, Patent Document 5 proposes a structure in which a bag body is suspended by a hook and closely contacted with the inner surface of the housing by water pressure. In the earthquake-resistant water storage tank of Patent Document 6, an appropriate portion of the upper end portion of the bag body is attached to a surface fastener. It is moored to the wall of the housing so that it can be relaxed by a mooring tool such as a bolt, a hook, or the like, and in Patent Document 7, the bag is suspended by a cover plate.

  Moreover, as a structure of the water tank provided with the bag body of the resin sheet, Patent Document 8 describes a water storage tank by stretching a water shielding sheet on the mortar base of the inner wall of the drilled hole drilled in the ground. A simple water storage tank has been proposed in which beam members are stacked in a cross-beam shape at positions spaced apart from each other at the bottom to form a support column, and a support body is supported by this support column. A tank is shown in which a rectangular parallelepiped tank core having continuous internal voids is formed by connecting open core elements, and the tank core is covered with a water shielding sheet and further surrounded by an outer plate. Further, although not provided with a concrete casing, Patent Document 10 and Patent Document 11 show a water tank containing a bag body inside an assembly-type outer frame that holds water pressure. No. 11 is attached to a box-shaped outer frame with a plurality of fixing bands with hook-and-loop fasteners provided at the upper end of the bag.

Japanese Utility Model Publication No. 61-141368 Registered Utility Model No. 3016780 Japanese Patent No. 3646529 Japanese Patent No. 3702434 Japanese Utility Model Publication No. 52-117608 JP-A-8-260527 JP-A-9-272589 JP-A-9-41434 JP 2001-130691 A JP 2010-203073 A JP 2011-12392 A

  When repairing an old concrete tank, the method of attaching a bag made of a resin sheet to the inner surface of the concrete frame is relatively easy and highly durable, but the sheet itself or this is attached to the inner surface of the concrete frame. The structure that attaches hook-and-loop fasteners requires that the inner surface of the concrete frame be dry, and that these bonded parts must be sufficiently dried. In the case of repairing an existing aquarium, the weather The problem remains that the construction is restricted by such factors. The anchor is fixed to the concrete frame by drilling a hole in the concrete frame, inserting the anchor pin into the hole and driving it in. The anchor pin is expanded and fixed in the hole. When the concrete is spread, a large local force acts on the concrete, and the old concrete frame has a problem that the pin-fixed portion may be chipped or cracked.

  Moreover, in the structure which fixes only the upper part of a sheet | seat, since a sheet | seat is drawn into a water absorption pipe at the time of water absorption, it cannot employ | adopt as a fire prevention water tank. The same problem may occur when a sheet is bonded with an adhesive or a hook-and-loop fastener, and if the bottom part is peeled off, there is a risk that the part of the sheet that is peeled off when the pump is discharged will be sucked into the water absorption pipe and cannot be absorbed. It is also a problem that it is difficult to confirm whether or not the adhesion is peeled off.

  The present invention is a water tank having a structure in which a watertight bag body generally made of a resin sheet such as vinyl chloride is attached to the inner surface of a concrete frame that receives water pressure in the water tank, and is a concrete tank of an old concrete water tank. It is an object to provide a structure of an aquarium that is particularly suitable for repairing an existing concrete aquarium, such as stopping water leakage due to deterioration or cracking of the enclosure, and a method for renovating an existing concrete aquarium into an aquarium of that structure .

  The method for repairing a concrete water tank according to the present invention is a method of joining a plurality of water-tight sheets cut to a predetermined size or folding one water-tight sheet to form an inner surface of an existing concrete casing 1 that forms a water tank ( The bag body 2 having a size attached to the bottom surface 11 and the inner wall surface 12) is manufactured, and the bag body is folded and placed in an existing concrete casing to be the bottom of the bag body 2 (bag bottom). The sheet 3 is spread out, the frame body 3 having a size attached to the inside of the bag body is assembled on the spread bag bottom, and the sheet of the portion (bag wall) that becomes the side wall of the bag body 2 is attached to the frame body 3. It is pulled up along the outer peripheral surface, and its upper edge is locked to the upper edge of the frame 3 with a rope 4 or a metal fitting.

  The water tank of the present invention includes a concrete housing 1 that retains the shape of the tank against the water pressure in the water tank, and a watertight bag 2 attached to the inner surface of the concrete housing. The water tank of the present invention includes a frame body 3 installed in the concrete housing with a gap between the bottom surface 11 and the inner wall surface 12 of the concrete housing, and the bag 2 has a sheet of the bottom 21 of the concrete housing. Sandwiched and held between the bottom surface 11 and the lower surface of the frame 3, the sheet of the surrounding portion (bag wall) 22 is located between the inner wall surface 12 of the concrete housing and the outer peripheral surface of the frame 3, and The upper edge 23 of the bag wall is held by the upper edge 33 of the frame 3.

  Some existing aquariums do not have an accurate rectangular shape due to restrictions on the installed topography. Such a water tank preferably has a structure in which the corners of the four corners are not right angles, and the frame 3 has a structure in which the angles of the four corners can be set in accordance with the four corner angles of the existing water tank. The frame body 3 is usually convenient to be assembled in a concrete housing, and preferably has a structure that can be adjusted in shape according to the shape of the inner surface of the concrete housing at the time of assembly.

  The angle of the four corners of the frame 3 is adjusted by providing the corner pillars 34 made of pipes in the vertical direction at the four corners of the frame 3, and the members 38 and 39 forming at least one of the two frame surfaces sandwiching each corner pillar are This can be achieved by adopting a structure in which the elbow 5 or the cheese 6 is connected to the corner column 34 so as to be rotatable around the axis of the corner column 34.

  Slight adjustment of the length of the horizontal side of the frame 3 can be achieved by providing a U-shaped portion 41 formed so as to bend downward or upward in the middle of the pipe members 38 and 39 extending in the direction of the side. Become. The U-shaped portion 41 is a tube 38a on both sides in the horizontal direction in which the elbow 5 is attached to both ends of the horizontal short tube 45 and the elbow 5 is attached to the opposite ends with two short vertical short tubes 44. It can be formed by connecting to 38b, 39a, 39b. This U-shaped portion 41 eliminates the need to move the insertion length to the outside when inserting the ends of the horizontal pipe members 38, 39 into the elbow or cheese in the water tank. The frame 3 can be assembled with a gap shorter than this insertion length. This advantage can also be achieved by providing L-shaped bent portions 42 at the ends of the horizontal pipe members 38 and 39 and connecting them to the corner posts 34.

  The frame 3 assembled with the pipe material is provided with a through hole for introducing water from the water tank in the pipe to prevent the float from rising. The bottom of the frame 3 can be pressed with a weight, but by placing the upper end of the frame 3 close to the lower surface of the lid 15 of the water tank, the frame 3 floats and the concrete frame of the bag bottom sheet Can be suppressed by the weight of the lid 15.

  According to the method for repairing a concrete water tank in which water leakage has occurred according to the present invention, the sheet of the bag bottom of the watertight bag body 2 is spread on the bottom surface 11 of the concrete casing of the water tank to be repaired and cut into a predetermined length. By connecting the plurality of pipes 34... 48 with joints including the elbow 5 and the cheese 6, the frame 3 having substantially the same shape as the inner surfaces 11 and 12 of the concrete frame is assembled on the sheet as a whole. The four sides of the sheet of the bag bottom 21 portion spread on the bottom surface 11 of the housing are pulled up to the upper edge of the frame body 3 and locked.

  According to the present invention, the bag body 2 has a sheet of the bag bottom 21 and the bag wall 22 between the bottom surface 11 of the concrete housing and the lower surface of the frame 3, and the inner wall surface 12 of the concrete housing 12 and the frame 3. It is attached to the inner surface of the concrete frame 1 in a state of being sandwiched between the outer peripheral surfaces of the concrete frame 1. Since this attached state is held by the frame body 3, it is not necessary to attach a metal fitting such as an anchor to the concrete housing 1, and the concrete housing is not damaged. Moreover, since the separation of the bag body 2 from the inner surface of the concrete housing is suppressed by the frame body 3, the sheet is not caught in the water absorption pipe at the time of water discharge. Furthermore, since the construction can be performed even when the inner wall surface of the concrete frame is wet, repair work can be performed immediately after draining the water in the aquarium, and the construction period is not affected by the weather.

Sectional view of the water tank of the example Perspective view of the frame Perspective view of U-shaped part of frame Perspective view of L-shaped part of frame Perspective view of the frame with attached bag Exploded perspective view showing an example of the structure of the pit part Cross section of existing aquarium

  Embodiments of the present invention will be described below with reference to the drawings. The existing fire prevention water tank 10 shown in FIG. 7 includes a box-shaped concrete casing 1 embedded in the ground, and a lid 15 for closing the upper surface opening. The concrete frame 1 is made of cast-in-place concrete, and the inner surface (the bottom surface 11 and the inner wall surface 12) is formed by a concrete molding form assembled on the site, the bottom surface 11 is horizontal, and the inner wall surface 12 is vertical. . The lid 15 is provided with a manhole 16 and a manhole lid 17 that can be freely opened and closed is attached. The water tank having the structure shown in FIG. 1 is repaired when water leakage occurs in the existing water tank or when there is such a possibility.

  The water tank according to the present invention includes a frame 3 installed in the concrete housing 1 with a gap between the inner wall 12 of the concrete housing 1, a space between the lower surface of the frame and the bottom surface 11 of the concrete housing, and a frame. And a watertight bag body 2 formed of a vinyl chloride resin sheet attached in a state of being sandwiched between the outer peripheral surface of the body 3 and the inner wall surface 12 of the concrete frame. The frame 3 has substantially the same shape as the inner surface formed by the bottom surface 11 and the inner wall surface 12 of the concrete frame. That is, in a state where the frame body 3 is installed in the concrete housing 1, the lower surface thereof is attached to the bottom surface 11 of the concrete housing, and the entire outer peripheral surface thereof forms a bag 2 on the inner wall surface 12 of the concrete housing. It is opposed to leave a gap that can be inserted.

  The bag body 2 is formed into a box shape attached to the inner surfaces 11 and 12 of the concrete frame by water-tightly connecting vinyl chloride sheets cut to an appropriate size by heat sealing, or flat rectangular sheets at four corner portions. It is folded back and formed into a similar box shape. The bag body 2 is positioned in a gap formed between the inner surfaces 11 and 12 of the concrete casing and the outer surface of the frame body 3, and the upper side of the box shape is locked to the upper edge 33 of the frame body 3. It is in a state. In the example of the figure, rope insertion holes are provided at predetermined intervals on the upper edge of the bag body 2, and the bag body 2 is opposed to the rope body 4 provided on the upper portion of the frame body 3 so as to cross the upper surface of the frame body in a lattice shape. By connecting the upper sides of both sides to each other, the upper side of the bag body 2 is locked to the upper edge of the frame body 3. The rope 4 is arranged so as not to cross the manhole 16 portion of the lid.

  The concrete dimensions of the concrete frame 1 shown in the figure are a rectangle with a length of 6 m and a width of 4 m, and a depth of 2 m. The four corners of the planar rectangular shape are not exact 90 degrees, but are distorted rectangles with angular errors. When manufacturing the box-shaped bag body 2 by heat sealing or the like, the dimensions of the inner surface of the concrete housing 1 are measured and manufactured so as to match the shape of the inner surface. The same applies to the frame 3, and a plurality of pipes 34... 48 cut into a predetermined length based on the internal dimensions of the concrete frame 1 are used to form a box-shaped frame as a whole using the elbow 5 and the cheese 6. It is what. In the example of the figure, a PVC pipe for water pipe having a diameter of 60 mm is used as the pipe material, and the frame body 3 is assembled using an elbow and cheese for connecting the water pipe.

  FIG. 2 is a perspective view of the frame 3. The small edge surface (small edge frame) of the frame shown in the figure is formed by upper and lower horizontal beams 35 and 36 each extending in a straight line, corner pillars 34 positioned at the four corners of the water tank, and three intermediate pillars 37. . The end portions of the corner column 34 and the upper and lower horizontal beams 35 and 36 are connected by an elbow 5, and the upper and lower ends of the intermediate column 37 and the horizontal beams 35 and 36 are connected by the cheese 6.

  The upper and lower horizontal beams 38, 39 on the side surface (side frame) of the frame have a structure in which two horizontal tubes 38a and 38b, 39a and 39b, which are located on the same line, are connected by a U-shaped portion 41, and both ends thereof are The cheese 6 is connected to the corner post 34. Both ends of the upper beam 38 are provided with L-shaped portions 42 bent downward to prevent the elbow 5 and the cheese 6 from colliding and the upper edge side and the side edge have the same height. 34 is connected. The side frame is provided with four intermediate pillars 43 whose upper and lower ends are connected to the upper and lower horizontal beams 38 and 39 with cheese 6. The L-shaped portion 42 and the U-shaped portion 41 are formed by connecting the ends of a short vertical tube 44 and a horizontal tube 45 with an elbow 5 as shown in FIGS.

  The bottom surface (bottom frame) of the frame 3 is formed by four horizontal bottom tubes 46 that connect the lower beams 39 of the side frames on both sides. Both ends of the four bottom tubes 46 are connected to the inclined tube 47 by 125 degree elbows 5a, respectively, and the tip of the inclined tube 47 is connected to the lower beam 39 of the side frame by the cheese 6. Further, the intermediate portions of the upper beams 38 facing each other in the side frame are connected by a reinforcing beam 48. The frame 3 is assembled as a whole in the water tank after carrying a single part or a part of the frame 3 assembled from the manhole 16 into the water tank.

  Next, a procedure for repairing an existing fire prevention water tank to obtain the fire prevention water tank of the present invention will be described. First, the water in the existing fire prevention water tank is drained, the internal dimensions are measured, the bag body 2 is designed and manufactured based on this, the frame body 3 is designed, and its parts are prepared. When there is a design drawing for the existing fire prevention water tank, the production of the bag body and the preparation of the parts of the frame body can be performed based on this. When those preparations are completed, the water in the fire prevention water tank is drained again, the bag body 2 is put into the tank from the manhole 16, and the part which becomes the bottom face of the water tank is spread on the bottom face of the water tank. Next, the parts of the frame body 3 are carried into the water tank, and the end of the pipe material cut in advance to a predetermined size is inserted into an elbow or cheese and fixed with an adhesive, whereby the frame body 3 is placed on the spread sheet. Assemble. In addition, when the pipe material is provided with water passage holes and air vent holes at appropriate locations in advance and water is poured into the water tank after construction, water enters the inside of the pipe material constituting the frame body and acts on the frame body. Buoyancy is reduced.

  The upper edge 23 of the bag body 2 which is assembled around the frame body 3 or is placed around the bottom of the water tank in parallel with the assembly of the frame body is pulled up, and the upper edge 23 of the raised bag body 2 is used as the frame body 3. Lock to the top edge. In the illustrated embodiment, the upper edge 23 of the bag body is pulled up and locked by inserting the rope 4 through a hole provided in the upper edge of the bag body 2 at a predetermined interval. FIG. 5 is a view showing an example in which the upper edge 23 of the raised bag body 2 is locked to the upper edge of the frame body 3 by the rope 4, and the rope passed through the hole at one upper edge of the bag body 2. The upper edge 23 of the bag body 2 is locked to the upper edge member of the frame body 3 by spanning 4 over the frame body 3 and inserting and fastening it through holes provided in the upper edge facing each other. A plurality of ropes 4 are stretched in a grid pattern so as not to cross the opening of the manhole 16.

  Some water tanks are provided with a pit for inserting the tip of a water absorption hose at the bottom. For such an aquarium, an inverted hat-shaped pit bag 25 having a flange 26 provided on the upper part of a cylindrical bag having a size corresponding to the diameter and depth of the pit is manufactured, and the bottom of the main bag is handled. An opening is provided at the position, and the bag body 2 is manufactured in which the flange 26 of the pit bag 25 is heat-sealed around the opening. Then, a bucket-shaped or bowl-shaped resin molded product 49 to be inserted into the pit bag 25 is inserted inside the pit bag 25 inserted into the pit of the water tank, and the upper edge of the molded product 49 is pressed. A strip or angle 51 for preventing the floating or movement of the strip is arranged so that both ends thereof are below the bottom tube 46 of the frame 3, and both ends of the strip or angle 51 are attached to the frame by U bolts or the like. 3 is fixed to the bottom tube 46. If it does in this way, when the tip of a water absorption hose is inserted in the cylindrical molded product 49 and it absorbs water, it can prevent that the sheet | seat of a bag body is sucked into a water absorption hose by a water flow, and water in a water tank can be drained. Water can be absorbed without leaving.

1 concrete frame 2 bag 3 frame 4 rope 5 elbow
11 Bottom
12 Inner wall
15 lid
21 Bag bottom
22 bag wall
23 Upper edge of bag wall
33 Upper edge of frame
34 Corner pillar
38 Upper beam
38 (a, b) Horizontal pipe
39 Lower beam
39 (a, b) Horizontal pipe
41 U-shaped part
42 Bend
44 Longitudinal short pipe
45 Horizontal short pipe

Claims (5)

  In a water tank comprising a concrete housing that retains the shape of the water tank against the water pressure in the water tank, and a watertight bag attached to the inner surface of the concrete housing, a bottom surface and an inner wall surface of the concrete housing, Including a frame body installed in the concrete housing with a gap between, and the bag body is held by sandwiching a sheet of a portion serving as a bag bottom between the bottom surface of the concrete housing body and the lower surface of the frame body, The sheet of the portion that becomes the bag wall is located between the inner wall surface and the outer peripheral surface of the frame, and the upper edge of the sheet of the bag wall is held by the frame, Aquarium.   The frame body is provided with corner columns made of pipes in the vertical direction at the four corners, and a member forming at least one of the two frame surfaces sandwiching each corner column is connected to the corner columns with elbows or cheese. The aquarium according to claim 1, characterized in that   The water tank according to claim 2, wherein a U-shaped part or an L-shaped part with a vertical short pipe interposed in a part of a horizontal pipe constituting the frame is provided.   A lid is provided, and the upper end of the frame body is located close to the lower surface of the lid board, so that the float of the frame body and the float at the bottom of the bag from the bottom surface of the concrete housing are suppressed. Item 1. The water tank according to item 1.   A method for repairing a concrete water tank in which water leakage has occurred, where a watertight structure sheet is spread on the bottom surface of the concrete tank of the water tank to be repaired, and a plurality of pipes cut into a predetermined length are joined together with elbows and cheese. Assembling a frame body that is substantially the same shape as the inner surface of the concrete frame as a whole on the sheet, and connecting the four sides of the sheet spread on the bottom surface of the concrete frame to the upper edge of the frame body A method for repairing a concrete water tank, characterized in that the concrete water tank is lifted up and locked to the upper edge.

Images