JP5137075B2 - Low temperature PC tank outer tank side liner rigid anchor device - Google Patents

Description

  The present invention relates to an outer tank side of a low-temperature PC tank used for embedding in a PC liquid breakwater (concrete frame) in a low temperature PC tank such as an LNG tank and fixing the outer tank side liner to the inner surface of the PC liquid breakwater. The present invention relates to a liner rigid anchor device.

  An outer tank side liner is fixed to the inner peripheral surface of the PC liquid barrier in a low temperature PC tank such as an LNG tank in order to maintain airtightness.

  The outer tank side liner is fixed to the PC liquid barrier by fixing the outer tank liner to the anchor embedded in the PC liquid barrier by welding or the like. When the liner is fixed, it is necessary to support the dead weight of the outer tub side liner, and between the outer tub side liner and the PC levee due to shrinkage (prestressing, creep, etc.) of the PC dam. It is necessary to have sufficient shear resistance against the acting shear force.

  As one of the conventional outer tank side liner anchor structures used to satisfy the above-mentioned needs, a metal separator cone 1 as shown in FIGS. 5 and 6 is used as an anchor. is there.

  That is, the separator cone 1 shown in FIG. 5 and FIG. 6 has a flange plate 2 made of a disk-shaped thin plate, and is fixedly projected by welding at the center of the back surface of the flange plate 2 and will be described later on the tip surface. The separator comprises a cylindrical cone portion 3 provided with a connecting screw hole 4 as a required depth.

  As shown in FIGS. 5 to 7, the separator cone 1 is a required portion of the formwork member 6 a located inside the concrete formwork 6 used when constructing the PC breakwater 5, that is, a vertical direction (not shown) and Attach to the part corresponding to the separator that is arranged so as not to interfere with the reinforcing bars such as the main bars in the circumferential direction and the reinforcing bars in the plate thickness direction. The leading end portion of the extending separator 7 is connected by being screwed into the screw hole 4 of the cone portion 3 protruding outward of the separator cone 1, and the concrete mold 6 is held by the separator 7 and the separator cone 1. It is like that.

  As described above, the separator cone 1 that is used by being attached to the concrete mold 6 in advance is subjected to the concrete placement in the mold 6 and after the curing of the cast concrete, the PC breakwater 5 is constructed. The mold member 6a of the concrete mold 6 is separated from the collar plate 2 of the separator cone 1, and the mold member 6b is detached from the separator 7, and the separator cone 1 and the separator 7 are embedded in the PC liquid barrier 5; The surface of the flange plate 2 of the separator cone 1 is exposed on the inner peripheral surface of the PC liquid barrier 5, and the outer tank side liner 8 is fixed to the surface of the flange plate 2 by welding. I am trying to make it. Reference numeral 9 denotes a welded portion of the cone portion 3.

  On the other hand, containers such as LNG tanks and reactor containment vessels that are made of concrete as a strength member are covered with a steel liner. FIG. 8 and FIG. 9 show an example, and a steel in which a large number of studs 11 embedded in the concrete portion 10 are anchored with their tips exposed to the inner surface of the concrete portion 10 and arranged inside the concrete portion 10. The back side of the made liner 12 is fixed to the tip of each stud 11 to support the steel liner 12. Reference numeral 13 denotes a pad plate that is provided so that it is not directly attached to the liner 12 when a bracket or a support is attached to the inside of the liner 12 (see, for example, Patent Document 1).

JP 2003-40393 A

  However, as described above, the anchor embedded in the PC liquid barrier is shearing force generated between the outer tank side liner and the PC liquid barrier due to the shrinkage of the PC liquid barrier (prestress introduction, creep, etc.). On the other hand, it is necessary to appropriately determine the interval and the number of anchors so that the welded portion between the outer tank side liner and the anchor can withstand, but in the case where the separator cone 1 is used as an anchor, the separator cone 1 The installation position of the separator depends on the allocation of the separator 7 attached to the mold 6 and embedded in the PC liquid barrier, and there is a problem that the separator cone 1 cannot be installed at an arbitrary position. There is a problem that the separator 7 must be considered so as not to interfere with the reinforcing bars in the vertical direction and the circumferential direction when the bars are arranged. Furthermore, the separator cone 1 that is manually installed on the formwork is a formwork member prior to concrete placement due to the fact that the cone portion 3 is cylindrical and heavy, the collar plate 2 is disc-shaped and difficult to handle, etc. There is a problem that a lot of labor and time are required for the mounting work to 6a.

  Further, in the case of using the stud described in Patent Document 1 as an anchor, since the outer tub side liner is fixed to each stud 11, there is a problem that a large number of studs 11 for supporting the outer tub side liner are required. .

  Therefore, the present invention is lightweight and excellent in handling, increases the contact area with the concrete to maintain the performance required for the anchor, and further, at any point without considering interference with the reinforcing bar in the PC liquid barrier It is an object of the present invention to provide an outer tank side liner rigid anchor device for a low-temperature PC tank that can be freely arranged.

  In order to solve the above-mentioned problems, the present invention provides an outer tank side liner rigid anchor device embedded in the PC liquid barrier to support the outer tank side liner covering the inner surface of the PC liquid barrier of the low temperature PC tank. , The steel plate is attached to one side of the flange plate extending in the vertical direction so as to project the required dimension in the horizontal direction, and the sum of the thickness dimension of the collar plate and the amount of projection of the profile steel from the collar plate is The size is made smaller than the concrete cover size near the inside of the PC liquid barrier, and the shape steel is embedded on the inner peripheral surface of the PC liquid barrier so that the shape steel faces outward. To do.

  Moreover, in the said structure, it is set as the structure which attached the handle to the shape steel mounting surface of a collar board, and was embedded in the concrete of PC liquid barrier.

According to the outer tank side liner rigid anchor device of the low temperature PC tank of the present invention, the following excellent effects are exhibited.
(1) In the outer tank side liner rigid anchor device embedded in the PC liquid barrier to support the outer tank side liner covering the PC liquid barrier of the low temperature PC tank on the PC liquid barrier, The shape steel is mounted on one side so that the required dimension extends in the horizontal direction, and the sum of the thickness of the collar plate and the amount of projection of the shape steel from the collar plate is It is designed to be smaller than the cover size of the concrete on the inner side, and is embedded in the inner peripheral surface of the PC liquid barrier so that the shape steel faces outward. The structure can be made lighter and handling can be improved, and the surface area can be greatly increased by the shape steel compared to the cylindrical one, and the contact area with concrete can be increased. Anka It can be sufficiently retained performance required. Furthermore, since the shape steel is stored in the concrete cover, it is not necessary to consider the interference with the reinforcing bars in the PC liquid barrier, and it is possible to embed it freely at any location.
(2) By attaching the handle to the collar plate, it becomes possible to temporarily place the handle on the circumferential line, etc., making the handling of the device easier and making it easier to attach to the formwork. In addition, since the handle is embedded in the concrete, the anchor effect can be enhanced by the handle itself.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIGS. 1 (a), (b), (c) to FIG. 3 show one embodiment of an outer tub side liner rigid anchor device for a low temperature PC tank according to the present invention.

  That is, an anchor main body 16 that projects a required dimension in a direction perpendicular to the flange plate 15 is provided on one side surface, which is the back surface of the flange plate 15 made of a rectangular thin plate that extends in the vertical direction, and the thickness of the collar plate 15 is increased. The dimension D, which is the sum of the length dimension and the amount of protrusion of the anchor body 16 from the collar plate 15, is vertical in the concrete of the PC breakwater 18 of the low-temperature PC tank 17 shown in FIGS. Out of the main muscles 19a, 19b located on the innermost side (innermost edge) of the PC breakwater 18 among the vertical muscles 19a that are the main muscles arranged in the direction and the circumferential muscles 19b that are the main muscles arranged in the circumferential direction. The outer tank side liner rigid anchor device 14 is configured so as to be smaller than the concrete cover thickness T up to the inner peripheral surface of the PC liquid barrier 18.

  More specifically, the anchor body 16 is formed by cutting a required shape steel, for example, an H-shaped steel, into a predetermined length, and one end of the anchor body 16 is formed on the collar plate 15. It is integrally attached to the center of the back by welding. As a result, the anchor main body 16 is formed into an H-shaped cross-sectional shape having a large surface area per unit length dimension and unit weight, and the adhesion area (contact area) between the anchor main body 16 and the concrete concrete of the PC breakwater 18 is reduced. A large amount can be secured. Furthermore, by making the anchor body 16 have an H-shaped cross-sectional shape, in addition to the own weight of the outer tank side liner 20 that is disposed on the inner peripheral side of the PC liquid barrier wall 18 and is attached to the surface side of the collar plate 15. The reaction force when a force in the buckling direction acts on the outer tub side liner 20 in accordance with the prestress introduction of the PC breakwater 18 or contraction due to creep or the like is caused by the reaction force between the outer tub side liner 20 and the PC barrier. When acting as a shearing force with the liquid bank 18, the anchor body 16 can ensure a cross-sectional performance for supporting this shearing force.

  Furthermore, in order to improve handling, the upper part of one side which becomes the back surface of the collar plate 15, for example, two upper left and right positions on one side of the collar plate 15 as shown in FIG. Is provided with a handle 21 made of a rod projecting from one side of the collar plate 15.

  Screw holes 22 are provided at the outer peripheral portion of the collar plate 15, for example, at two diagonal corners. Accordingly, the outer tank side liner rigid anchor device 14 is disposed at a required position on the inner surface (concrete casting side surface) of the concrete casting formwork member 23a used when constructing the PC liquid breakwater 18. The bolt 24 inserted from the outside of the mold member 23a into the bolt hole (not shown) provided in the mold member 23a is removably screwed into the screw hole 22 of the collar plate 15 and tightened. The outer tank side liner rigid anchor device 14 can be detachably held on the inner surface side of the mold member 23a.

  Reference numeral 25 denotes a shear reinforcing bar arranged in the thickness direction of the concrete of the PC breakwater 18, that is, a direction perpendicular to both the vertical bars 19 a and the circumferential bars 19 b, and 26 denotes a collar plate 15 and an anchor body 16. It is a welding part.

  When using the outer tank side liner rigid anchor device 14 having the above configuration, first, for each lot set by dividing the concrete of the PC breakwater 18 to be constructed into a plurality of parts in the height direction and the circumferential direction, respectively. The bar reinforcement work of the vertical reinforcement 19a that is the main reinforcement for passing in the vertical direction, the circumferential reinforcement 19b that is the main reinforcement for passing in the circumferential direction, and the shear reinforcement reinforcement 25 that is the reinforcing bar that passes in the plate thickness direction. Do. In addition, since the shear reinforcing bar 25 has a certain degree of freedom in the installation range during this bar arrangement work, the PC liquid bank is inserted from the inner peripheral side end of the PC liquid bank 18 in the shear reinforcing bar 25. The thickness dimension of the collar plate 15 in the outer tank side liner rigid anchor device 14 and the amount of protrusion of the anchor body 16 from the collar plate 15 are larger than the concrete cover thickness set up to the inner peripheral surface of 18. When the sum dimension D is larger, the position where the shear reinforcing bar 25 is arranged is arranged in advance in a state where the position is not shifted from the position where the outer tank side liner rigid anchor device 14 is not interfered with. To leave.

  Next, as shown in FIG. 3, the inner surface of the inner peripheral formwork member 23a to be arranged on the inner peripheral side of the above-mentioned vertical reinforcing bars 19a, the circular reinforcing bars 19b and the shear reinforcing bars 25 (concrete molding). In the state where the outer tank side liner rigid anchor device 14 is arranged on the installation side surface in correspondence with the planned location on the PC liquid breakwater 18 shown in FIGS. A bolt 24 inserted from the outside into a bolt hole (not shown) of the mold member 23a is screwed into a screw hole 22 provided in the collar plate 15 of the tank side liner rigid anchor device 14, and the inner peripheral side mold The outer tank side liner rigid anchor device 14 is held at a predetermined position on the inner surface of the member 23a.

  Next, the inner peripheral formwork member 23a in which the outer tank side liner rigid anchor device 14 is held on the inner peripheral side and the outer peripheral side of the arranged vertical bars 19a, the circular bars 19b, and the shear reinforcement bars 25. And after arrange | positioning the outer periphery side formwork member 23b, respectively, this each inner periphery side and outer periphery side formwork members 23a and 23b are connected through the separator which is not shown in figure, and the concrete formwork 23 is comprised.

  Thereafter, concrete is placed on the concrete formwork 23 and then cured.

  After curing the concrete placed in the concrete mold 23 as described above, the bolt 24 holding the outer tub side liner rigid anchor device 14 on the inner periphery side mold member 23a is removed, and the After the outer tank side liner rigid anchor device 14 is separated from the inner peripheral formwork member 23a, when the inner peripheral side and outer peripheral formwork members 23a and 23b are removed, the collar is placed at a predetermined position on the inner peripheral surface. The PC liquid breakwater 18 in which the outer tub side liner rigid anchor device 14 is embedded is constructed in a state where the other side surface serving as the surface of the plate 15 is exposed.

  Therefore, after that, the outer tub side liner 20 is disposed on the inner peripheral side of the PC liquid barrier 18 and the outer tub side liner 20 is placed at a predetermined position on the inner peripheral surface of the PC liquid barrier 18. The outer tank side liner rigid anchor device 14 is fixed to the surface of the flange plate 15 by welding.

  In the PC breakwater 18 constructed as described above, the outer tank side liner rigid anchor device 14 disposed on the inner peripheral surface of the PC breakwater 18 is attached to the outer surface side of the collar plate 15. In addition to the dead weight of the tank side liner 20, even if a shearing force acts between the outer tank side liner 20 and the PC liquid barrier 18 due to the shrinkage of the PC liquid barrier 18 (prestress introduction, creep, etc.), The outer tank side liner rigid anchor device 14 has an anchor body 16 for burying in the concrete body of the PC liquid breakwater 18 as an H-shaped cross section, and increases the surface length per unit length dimension and unit weight, A large adhesion area (contact area) of the PC liquid breakwater 18 with the frame concrete can be secured, and a shearing force acting between the outer tank side liner 20 and the PC liquid breakwater 18 is supported. Cross-sectional performance for Therefore, the outer tank side liner rigid anchor device 14 may fall off from the concrete body of the PC liquid barrier 18 or the outer tank side liner rigid anchor device 14 itself may be destroyed. There is no.

  Thus, according to the outer tank side liner rigid anchor device 14 of the low-temperature PC tank of the present invention, it is configured to include the collar plate 15 and the anchor body 16 made of H-shaped steel having a large surface area per unit weight. Thus, it is possible to reduce the weight while ensuring sufficient adhesion of the PC breakwater 18 for supporting the outer tank side liner 20 with the frame concrete, and to improve the handling property.

  Furthermore, since the handle 21 is provided on the back surface of the collar plate 15, the handling property of the outer tank side liner rigid anchor device 14 can be further improved. Further, the outer tank side liner rigid anchor device can be used by temporarily placing the handle 21 on a circumferential bar 19b arranged in the circumferential direction of the PC liquid barrier 18 using the handle 21. 14 handling performance can be improved. Furthermore, since the handle 21 is embedded in the frame concrete of the PC liquid barrier 18, the anchor effect can be enhanced by the handle 21 itself embedded in the PC liquid barrier 18.

  In the outer tank side liner rigid anchor device 14, the sum of the thickness dimension of the flange plate 15 and the dimension in which the anchor main body 16 protrudes from the back surface of the collar plate 15 is added to the frame concrete of the PC liquid barrier 18. From the vertical reinforcement 19a and the circumferential reinforcement 19b, which are the main reinforcements that are usually required to be strictly arranged, from the innermost edge to the inner peripheral surface of the PC breakwater 18 from the concrete cover thickness dimension Therefore, the outer tank side liner rigid anchor device can be placed at an arbitrary position on the inner peripheral surface of the PC liquid breakwater 18 without any interference with the arrangement of the main muscles 19a and 19b. 14 can be embedded freely.

  The sum of the thickness dimension of the collar plate 15 and the dimension of the anchor main body 16 projecting from the back surface of the collar board 15 is a shear reinforcement that is arranged in the thickness direction of the concrete of the PC liquid barrier 18 in the thickness direction. Even if the concrete cover thickness dimension from the inner peripheral side end portion of the PC breakwater 18 to the inner peripheral surface of the PC breakwater 18 is set to be slightly larger than the concrete cover thickness dimension, the installation range has a degree of freedom. If the shear reinforcing bar 25 is shifted and arranged to a position where it does not interfere with the outer tank side liner rigid anchor device 14, the degree of freedom of the arrangement of the outer tank side liner rigid anchor device 14 is affected. There is nothing.

  Further, the amount of protrusion of the handle 21 provided on the back surface side of the collar plate 15 from the collar plate 15 is such that the PC reinforcement from the vertical reinforcement 19a and the circumferential reinforcement 19b as the main reinforcement in the frame concrete of the PC breakwater 18 is provided. Even if the concrete cover thickness up to the inner peripheral surface of the liquid bank 18 is slightly larger than the concrete cover thickness, since the shape of the collar plate 15 is a rectangular shape extending vertically, the position of the outer tank side liner rigid anchor device 14 is It is allowable to shift the handle 21 by the rod diameter. Therefore, since the possibility that the handle 21 may interfere with the main muscles 19a and 19b can be prevented, the degree of freedom of the arrangement of the outer tank side liner rigid anchor device 14 is not affected.

  Next, FIGS. 4 (a), (b), and (c) show application examples of the embodiments of FIGS. 1 (a), (b), and (c) to FIG. 3 as other embodiments of the present invention. 4 (a) is similar to the outer tank side liner rigid anchor device 14 shown in FIGS. 1 (a), (b), and (c), and the anchor body is an anchor body 16 made of H-shaped steel. Instead, the anchor main body 16a is configured by cutting the grooved steel into a required length dimension, and the anchor main body 16a is configured to be attached to a side surface serving as the back surface of the flange plate 15 in a pair of upper and lower sides. Is.

  4 (b) shows an anchor body 16b having a structure in which a T-shaped steel is cut to a required length instead of the anchor body being an H-shaped steel anchor body 16. 16b is configured to be attached to the central portion of one side surface which is the back surface of the flange plate 15.

  Furthermore, FIG. 4 (c) shows an anchor body 16c having a configuration in which angle steel is cut into a required length instead of the anchor body being an H-shaped steel anchor body 16, and the anchor body 16c. Is configured such that a pair of upper and lower parts are attached to the central portion of one side surface which is the back surface of the flange plate 15.

  Other configurations in FIGS. 4A, 4B, and 4C are the same as those shown in FIGS. 1A, 1B, and 2C, and the same components are denoted by the same reference numerals.

  4 (a), (b), and (c), the anchor main bodies 16a, 16b, and 16c, each having a shape obtained by cutting a required shape steel, are employed, so that the anchor main bodies 16a, 16b, and 16c are The surface area per unit weight and unit length can be increased, the adhesion of the PC breakwater 18 to the frame concrete can be enhanced, and the shrinkage of the PC breakwater 18 (prestress introduction) , Creep, etc.), the cross-sectional performance for supporting the shearing force acting between the PC liquid breakwater 18 and the outer tank side liner 20 inside thereof can be ensured. Therefore, the same effects as those of the above-described embodiment can be obtained also by the embodiments of FIGS.

  In addition, this invention is not limited only to the said embodiment, If the area which welds and fixes the outer tank side liner 20 can be ensured, the size and aspect ratio of the collar board 15 may be changed.

  As long as the shape of the handle 21 provided on the collar plate is a shape that does not interfere with the vertical bars 19a and the circumferential bars 19b as the main bars arranged in the concrete of the PC breakwater 18 and the shear reinforcement bars 25, it is illustrated. Other shapes may be used.

  The shape steels constituting the anchor bodies 16, 16a, 16b, 16c include H-shaped steel, groove-shaped steel, angle-shaped steel, T-shaped steel, I-shaped steel, CT-shaped steel, flat steel, and other light-weighted shaped steels. The shape steel may be used. Further, the attachment position and the attachment posture may be changed according to the size of the collar plate 15.

  Of course, various modifications can be made without departing from the scope of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of an outer tub side liner rigid anchor device according to the present invention, in which (A) is a view seen from the back side, (B) is a view taken in the direction of arrows A-A in (A), and (C). (B) is a BB direction arrow line view of (a). FIG. 2 shows a PC breakwater part of a low-temperature PC tank equipped with the apparatus of FIG. 1, (a) is a schematic cut side view, and (b) is an enlarged view of an installation part of an outer tank side liner rigid anchor device. FIG. It is a schematic diagram which shows the state which installs the apparatus of FIG. 1 in the PC liquid breakwater of a low temperature PC tank. The other form of implementation of this invention is shown, (a) (b) (c) is a figure corresponding to FIG. 1 (a) which shows another form of an anchor main body, respectively. It is a front view of the conventional separator cone. It is a side view which shows the state which embeds and fixes the separator cone shown in FIG. 5 to a PC liquid breakwater, and uses it as an anchor. It is the schematic which shows the state which attached the separator cone and the separator to the concrete formwork. It is a cutting | disconnection side view which shows the liner attachment state to the conventional concrete container inner surface. It is sectional drawing which looked at the liner of FIG. 8 from the back surface side.

Explanation of symbols

14 Outer tank side liner rigid anchor device 15 Collar plate 16, 16a, 16b, 16c Anchor body (section steel)
17 Low temperature PC tank 18 PC breakwater 19a Vertical muscle (main)
19b Circumferential muscle (main muscle)
20 Outer tank side liner 21 Handle

Claims (2)

  In the outer tank side liner rigid anchor device embedded in the PC liquid barrier to support the outer tank side liner covering the PC liquid barrier inner wall of the low temperature PC tank, on one side of the flange plate extending in the vertical direction, The shape steel is mounted so that the required dimension extends in the horizontal direction, and the sum of the thickness dimension of the collar plate and the amount of projection of the profile steel from the collar plate is the innermost main bar of the PC liquid barrier Outside the low-temperature PC tank, characterized in that it has a configuration in which the shape steel is embedded on the inner peripheral surface of the PC liquid barrier so as to face outward. Tank side liner rigid anchor device.   The outer tank side liner rigid anchor device for a low temperature PC tank according to claim 1, wherein a handle is attached to the shape steel mounting surface of the collar plate, and the handle is embedded in the concrete of the PC liquid barrier.

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