JP6484036B2 - Wall body construction method, wall body - Google Patents

Description

  The present invention relates to a wall body construction method using a precast block, and a wall body.

  PC (prestressed concrete) tanks are sometimes used as equipment for storing liquids such as LNG (liquefied natural gas) and LPG (liquefied petroleum gas).

  FIG. 13 shows an example of an LNG tank 100 that stores LNG as a PC tank. The LNG tank 100 is provided with a liquid breakwater 2 on a bottom slab 5 supported by a pile 4 in the ground 7 and provided with an inner tank 3a and an outer tank 3b made of a steel plate or the like inside. LNG is stored in the inner tank 3a, and a heat insulating material is disposed between the inner tank 3a and the outer tank 3b to perform cold insulation.

  The breakwater 2 is a wall provided to prevent leakage of LNG to the outside when the inner tank 3a is damaged, and is generally cylindrical. The breakwater 2 needs to have a structure capable of withstanding the hydraulic pressure of LNG, and therefore prestress is introduced by a tension material (not shown) in the circumferential direction and the longitudinal direction.

  Although the hydraulic pressure can be resisted by introducing circumferential prestress to the breakwater 2, the breakwater 2 is always in a state where no fluid pressure is applied from the inside of the tank. For this reason, a bending moment in the tank inner direction is applied to the bottom of the wall body of the breakwater 2 due to the prestress in the circumferential direction, which may cause cracks and the like.

  In order to suppress this, a PC steel material in the vertical direction is separately provided at the bottom of the wall of the breakwater 2 and additional prestress is introduced to reinforce (for example, refer to Patent Documents 1 and 2).

  FIG. 14 is a diagram for explaining this. In the example of FIG. 14A, the side surface outside the tank of the wall bottom 2a is inclined, and longitudinal prestress is introduced by the PC steel material 12 provided along this inclination. Hereinafter, the side surface outside the tank is referred to as the outer side surface, and the side surface inside the tank is referred to as the inner side surface. The lower end portion of the PC steel material 12 is fixed in the bottom plate 5 by the fixing portion 13, and the upper end portion is fixed on the upper surface of the wall body bottom portion 2 a by the fixing portion 13. The upper part 2b of the wall bottom 2a is formed from this upper surface.

  In the example of FIG. 14B, the wall bottom 2a is thickened in the tank outer direction with respect to the upper part 2b, and the PC steel material 12 in the vertical direction is provided in this thickened part. The lower end portion of the PC steel material 12 is fixed in the bottom plate 5 by the fixing portion 13, and the upper end portion is fixed on the upper surface of the thickened portion of the wall body bottom portion 2a by the fixing portion 13.

JP 2005-350092 A JP 2011-148530 A

  However, in the example of FIG. 14A, the upper portion 2b cannot be formed unless pre-stress by the PC steel material 12 is introduced into the wall bottom 2a, leading to a prolonged construction period.

  In the example of FIG. 14 (b), the upper portion 2b can be formed before the prestress by the PC steel material 12 is introduced into the wall bottom 2a. It is difficult to introduce prestress into the wall bottom 2a during the formation of the portion 2b. As a result, after completion of construction of the breakwater 2, prestress is introduced into the wall bottom 2a, which also causes a prolonged construction period.

  An object of this invention is to provide the wall construction method etc. which can construct | assemble a construction easy and high quality wall body, and can shorten a construction period.

A first invention for solving the above-mentioned problem is a wall construction method for constructing a wall, in which a concrete precast block is arranged on a bottom plate to form a wall bottom, and the wall The upper part of the bottom part is made of concrete, and a wall body is constructed by introducing prestress with a precast block at the bottom part of the wall body and a first longitudinal tension material passing through the upper part of the bottom part of the wall body, The precast block is a wall construction method characterized in that prestress is preliminarily introduced before placement on the bottom plate by a second longitudinal tension material fixed at both ends to the precast block.

  In the present invention, since the wall bottom is formed using a precast block in which pre-stress is introduced in advance, additional pre-stressing is performed after the wall bottom is formed or after the entire wall is constructed as described above for reinforcement of the wall bottom. There is no need to introduce stress, construction is easy and the construction period can be shortened. In addition, since the precast block is managed and manufactured in the factory, the quality of the wall body is also improved.

The precast block is preferably disposed on a groove formed on the bottom plate and having a width larger than the thickness of the precast block, and a gap is filled in the gap between the groove and the precast block. .
In this case, the tension material is disposed at a position where it hits the top surface of the bottom plate where cracking or the like is most likely to occur at the bottom of the wall, and the proof stress of the bottom of the wall can be increased.

Furthermore, it is desirable to connect the precast block and the bottom plate with a connecting material.
Also by this, the proof stress of a wall body bottom part can be raised.

Preferably, the wall body is cylindrical, and a plurality of the precast blocks are arranged in the circumferential direction of the wall body, and circumferential prestress is introduced into the wall body.
The present invention is particularly effective in a case where circumferential prestress is introduced into the wall, and the wall bottom can be suitably reinforced in such a case.

The precast block has an inner side surface along the vertical direction and an outer side surface including an inclined portion inclined with respect to the vertical direction, and is disposed along the inclined portion as the second longitudinal tension member. It is desirable to have a PC steel material. Moreover, it is desirable to further have a PC steel material arranged along the inner side surface as the second longitudinal tension material.
In addition, a lower end portion of the PC steel material arranged along the inclined portion of the outer side surface is fixed at a lower end portion of the precast block, and an upper end portion of the PC steel material arranged along the inner side surface is fixed to the precast It is desirable to fix at the upper end of the block. Furthermore, it is preferable that the upper end portion of the PC steel material arranged along the inclined portion of the outer side surface and the lower end portion of the PC steel material arranged along the inner side surface are fixed inside the precast block.
Alternatively, it is also desirable to have a PC steel material that bends toward the outer side surface of the precast block in the middle of the longitudinal direction as the second longitudinal tension material.
Thus, the configuration of the precast block can be variously determined, and may be appropriate according to the force applied to the bottom of the wall body.
The upper portion of the bottom portion of the wall body is formed of a concrete precast block, and the length of the precast block in the bottom portion of the wall body may be longer than the length of the precast block in the upper portion. desirable. In addition, the longitudinal length of the precast block at the bottom of the wall body is the same as the lateral length of the precast block at the upper portion, and the lateral length of the precast block at the bottom of the wall is It is also desirable that the length is the same as the length of the upper portion of the precast block.
Furthermore, the upper part of the bottom part of the wall body is formed by a precast block made of concrete, and the reinforcing bar provided on the lower surface of the precast block of the upper part is inserted into the hole provided on the upper surface of the precast block of the wall body. It is also desirable that a joint is formed between the two precast blocks with a filling material, and a primer for moisturizing is applied to the lower surface of the upper portion of the precast block before the reinforcing bars are inserted into the holes. .

A second invention is a wall having a wall bottom formed by placing a concrete precast block on a bottom slab, and an upper portion of the wall bottom formed by concrete, wherein the wall Prestress is introduced by a first longitudinal tension material that passes through a precast block at the bottom of the body and an upper portion of the bottom of the wall, and the precast block has a second longitudinal tension in which both ends are fixed to the precast block. It is a wall body characterized by being prestressed by a material.

  According to the present invention, it is possible to provide a wall construction method and the like that can construct a high-quality wall body that is easy to construct and can shorten the work period.

Diagram showing breakwater 6 The figure which shows the precast block 10 The figure explaining the wall construction method The figure explaining the wall construction method The figure which shows the breakwater 60 The figure which shows the breakwater 61 The figure which shows the precast block 10b and the breakwater 62 The figure explaining the wall construction method The figure explaining the wall construction method The figure explaining the wall construction method The figure which shows the precast blocks 10d and 10e Diagram showing precast blocks 10f, 10g, 10h Diagram showing LNG tank 100 The figure explaining prestress introduction to the wall bottom 2a

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

[First embodiment]
(1. Breakwater 6)
FIG. 1 is a view showing a part of a breakwater 6 according to the first embodiment of the present invention. The breakwater 6 is a breakwater for the LNG tank described with reference to FIG. 13 and the like, and is a cylindrical wall.

  In the breakwater 6, a wall bottom 6 a on the bottom plate 5 is formed using a precast block (hereinafter sometimes referred to as a block) 10. The upper portion 6b of the wall bottom 6a is formed using a precast block 10 '.

  The block 10 is vertically long, and the block 10 'is horizontally long. The vertical size of the block 10 is about twice that of the block 10 ', and the horizontal size of the block 10 is about 1/2 of the block 10'. For example, the size of the block 10 is about 6.0 m in length and about 3.0 m in width, and the size of the block 10 ′ is about 3.0 m in length and about 6.0 m in width.

(2. Precast block 10)
FIG. 2 is a diagram showing the precast block 10 and shows a cross-sectional configuration of the block 10 in the thickness direction. The block 10 is obtained by introducing the above-mentioned additional pre-stress into a vertically long rectangular plate-shaped concrete body in advance with a PC steel material 12 (tension material). As the PC steel material 12, a PC steel bar or a PC steel wire is used.

  The PC steel material 12 is arranged vertically in the main body. The upper end portion of the PC steel material 12 is fixed to the concave portion 11 on the upper surface (upper end portion) of the main body by the fixing portion 13. The lower end portion of the PC steel material 12 is fixed to the concave portion 11 on the lower surface (lower end portion) of the main body by the fixing portion 13. In addition, a sheath tube 19 for passing the PC steel material in the circumferential direction of the breakwater 6 and a sheath tube (not shown) for passing the PC steel material in the vertical direction of the breakwater 6 are also provided inside the main body.

  The block 10 ′ is a sheath tube 19 (see FIG. 4 (a) described later) for passing the PC steel material in the circumferential direction of the liquid barrier 6 through a horizontally long rectangular plate-shaped concrete body, A sheath pipe (not shown) for passing the PC steel material in the vertical direction of the breakwater 6 is provided. The thickness of the main body is the same as that of the block 10. However, pre-stress introduction like the block 10 is not performed, and the PC steel material 12 and the like are omitted.

(3. Wall body construction method)
Next, a wall construction method for constructing the liquid breakwater 6 will be described with reference to FIGS.

  In this embodiment, a groove 5a is formed in the bottom plate 5 as shown in FIG. 3A, and the block 10 into which prestress has been introduced is disposed on the groove 5a as indicated by an arrow. The grooves 5 a are continuous in the circumferential direction of the liquid breakwater 6, and a plurality of blocks 10 are arranged side by side along the circumferential direction of the liquid breakwater 6.

  The width of the groove 5a is larger than the thickness of the block 10, and as shown in FIG. 3B, a gap 21 between the block 10 and the groove 5a is filled with a filler 21 made of non-shrinkable concrete or the like. Further, the block 10 and the bottom plate 5 are connected by a connecting material 15. Thereby, the block 10 is fixed to the bottom plate 5. In addition, the joint 20 (refer FIG. 1) by padding materials, such as non-shrinkable concrete, is provided between the blocks 10 adjacent to the circumferential direction. Thus, the wall bottom 6a is formed by the block 10.

  Next, the block 10 ′ is arranged on the upper stage of the block 10 as indicated by the arrow in FIG. A plurality of blocks 10 ′ are also arranged side by side along the circumferential direction of the breakwater 6, and joints 20 (see FIG. 1) are provided between the blocks 10 ′ adjacent in the circumferential direction and between the upper and lower blocks 10, 10 ′. It is done.

  In the same manner, the blocks 10 'are sequentially stacked in the upper stage to form the upper portion 6b of the wall bottom portion 6a as shown in FIG. 4B. Thereafter, the sheath tube of the blocks 10, 10' is formed. The prestress in the circumferential direction is introduced into the liquid breakwater 6 by the tension of the PC steel material 31 that has passed through 19. Further, the vertical prestress is introduced into the breakwater 6 due to the tension of the PC steel material (not shown) passed through the longitudinal sheath tube (not shown) of the blocks 10, 10 ′.

  In this way, the breakwater 6 is constructed. Circumferential prestress is introduced into the breakwater 6 and a bending moment in the tank inner direction is applied to the wall bottom 6a when the tank is liquid-empty. However, since the wall bottom 6a is reinforced by introducing additional prestress with the PC steel material 12 in the vertical direction, cracks and the like due to bending moment can be prevented.

  As described above, according to the present embodiment, the wall bottom portion 6a is formed using the block 10 in which prestress is introduced in advance, so that the wall bottom portion 6a is reinforced as described above for reinforcement of the wall bottom portion 6a. There is no need to introduce additional pre-stress after formation or after construction of the breakwater 6, construction is easy and the construction period can be shortened. In addition, since the block 10 is managed and manufactured at the factory, the quality of the breakwater 6 is also improved.

  Further, since the block 10 is disposed on the groove 5a of the bottom plate 5 and the filling material 21 is filled in the gap between the groove 5a and the block 10, the wall body bottom portion 6a is most likely to crack. Since the PC steel material 12 is arranged at a position corresponding to the upper surface of the bottom plate and the block 10 and the bottom plate 5 are connected by the connecting material 15, the proof stress of the wall body bottom portion 6a can be increased.

  However, the present invention is not limited to this. For example, in this embodiment, the block 10 is fixed to the bottom slab 5, but the block 10 of the wall bottom 6 a can be pin-coupled to the bottom slab 5 by the pin connecting portion 30 as shown in the breakwater 60 of FIG. 5. In this case as well, it is effective as a countermeasure against the bending moment accompanying the prestress in the circumferential direction of the breakwater 60.

  Further, in the present embodiment, the upper portion 6b of the wall bottom portion 6a is formed by the precast block 10 ', but can also be formed by in-situ concrete. Furthermore, although the example which builds the breakwater 6 was shown in this embodiment, this invention is applicable not only to the breakwater 6 but to various wall bodies. However, the present invention is particularly effective in a case where circumferential prestress is introduced into a cylindrical wall body such as the liquid breakwater 6, and the wall body bottom portion 6a can be suitably reinforced in such a case.

  Hereinafter, other examples of the present invention will be described as second to fifth embodiments. Each embodiment will be described with respect to differences from the first embodiment, and description of similar points will be omitted. In addition, the configurations of the embodiments including the first embodiment can be used in combination as necessary.

[Second Embodiment]
FIG. 6 shows a breakwater 61 according to the second embodiment. In the first embodiment, the block 10 is vertically long. In the second embodiment, the wall body bottom portion 6a is formed using a horizontally long precast block 10a having the same vertical and horizontal sizes as the block 10 ′. Also in this case, the block 10a is preliminarily introduced with additional prestress by a longitudinal PC steel material (not shown) having both ends fixed to the block 10a.

  In the case where the section for introducing the additional prestress in the vertical direction may be short, the wall bottom portion 6a can be formed by using the horizontally long block 10a similar to the block 10 ′ as described above, and is the same as in the first embodiment. The effect is obtained. However, when the vertically long block 10 as in the first embodiment is used for the wall body bottom portion 6a, it is possible to cope with a case where a section in which additional prestress is introduced in the vertical direction is long, and if the block 10 is tilted sideways. Since it has the same proportion as the block 10 ′ and the same weight, there is an advantage that there is no problem in terms of transportation and construction.

[Third Embodiment]
In the third embodiment, as shown in FIG. 7A, a plurality of upper and lower (two in the illustrated example) precast blocks 10b are integrated, and the wall bottom 6a is formed using this.

  Each block 10b is horizontally long, and the vertical and horizontal sizes are the same as the block 10 '. In the present embodiment, prestress is introduced into the upper and lower blocks 10b in advance by the vertical PC steel material 12 arranged over the upper and lower blocks 10b. The upper end portion of the PC steel material 12 is fixed to the concave portion 11 on the upper surface of the main body of the upper block 10b by the fixing portion 13. The lower end portion of the PC steel material 12 is fixed by the fixing portion 13 to the concave portion 11 on the lower surface of the main body of the lower block 10b.

  FIG. 7B is an example in which the wall bottom 6a of the breakwater 62 is formed using a block 10b in which two upper and lower stages are integrated. In the third embodiment, for example, after the individual blocks 10b are carried to the site, the blocks 10b are arranged up and down at the site, and the pre-stress by the PC steel material 12 is introduced and integrated as described above. Can do. A longitudinal sheath tube (not shown) for passing the PC steel material 12 is provided in the main body of the block 10b.

  Even in the case of the horizontally long block 10b, by using the upper and lower blocks 10b in an integrated manner, it is possible to cope with a case where a section in which additional prestress in the vertical direction is introduced is long, as in the first embodiment. An effect is obtained.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIGS. In the fourth embodiment, the wall bottom 6a is formed using the precast block 10c shown in FIG. FIG. 8A shows the outer side surface of the block 10c. The same applies to FIGS. 8B, 9, 10 </ b> A, and 10 </ b> B.

  In the block 10c, as in the first embodiment, an additional prestress is introduced in advance by a longitudinal PC steel material (not shown) having both ends fixed to the block 10c, and the reinforcing bar 16 protrudes from the lower surface of the main body. A hole 17 is provided on the upper surface.

  When the wall bottom portion 6a is formed, a plurality of blocks 10c are arranged in the circumferential direction of the liquid barrier, and joints are provided between the blocks 10c adjacent in the circumferential direction, as in the first embodiment.

  When the block 10c is arranged, the reinforcing bar 16 on the lower surface of the main body is inserted into the hole 5b formed in the groove 5a and arranged on the groove 5a. As shown in FIG. 8B, the block 10c including the inside of the hole 5b is also included. The filler 21 is filled in the gap between the groove 5a. The connection of the block 10c and the bottom plate 5 with a connecting material (not shown) is performed in the same manner as described above.

  When forming the upper portion 6b of the wall bottom portion 6a, the precast block 10c 'shown in FIG. 9 is arranged on the upper stage of the block 10c. The block 10c 'is substantially the same as the block 10c except that pre-stress introduction is unnecessary and the PC steel material is omitted. The vertical and horizontal sizes of the block 10c 'are not limited to those shown in FIG.

  When arranging the block 10c ', the moisture retaining primers 20a and 20b are sprayed and applied to the upper surface of the block 10c and the lower surface of the block 10c' in advance. For the block 10c ', the primer 20b is sprayed in a state of being laid down on the ground. The primers 20a and 20b are, for example, vinyl acetate / ethylene copolymer emulsion or acrylic / styrene copolymer resin emulsion. The primers 20a and 20b may be brushed.

  As a result, each surface is brought into a water absorption preventing state, and when forming the joint 20 described later, by preventing water absorption of the blocks 10c and 10c ′, a hydration reaction is caused by a dry-out phenomenon in which moisture such as mortar used as a filling material is absorbed. Is hindered to prevent poor curing and poor adhesion.

  After spraying the primers 20a and 20b, as shown in FIG. 10 (a), the reinforcing bar 16 on the lower surface of the main body of the block 10c ′ is inserted into the hole 17 on the upper surface of the main body of the block 10c, and the block 10c ′ is arranged on the upper stage of the block 10c. To do. Then, a joint 20 made of a filling material such as a non-shrink mortar is formed between the upper and lower blocks 10 c and 10 c ′ including the inside of the hole 17. Note that the interstitial material may be provided first on the upper surface of the block 10c and inside the hole 17, and the block 10c 'may be disposed on the upper stage of the block 10c later. As before, a plurality of blocks 10c 'are arranged in the circumferential direction of the liquid barrier, and joints are provided between the blocks 10c' adjacent in the circumferential direction.

  In the same manner, the blocks 10c 'are sequentially stacked in the upper stage, so that the upper portion 6b of the wall bottom 6a is formed as shown in FIG. 10 (b). Even when the third and subsequent blocks 10c ′ are arranged, the primer 20a is applied to the upper surface of the lower block 10c ′ and the primer 20b is applied to the lower surface of the upper block 10c ′ in the same manner as described above. Keep going.

  In the fourth embodiment, the same effect as in the first embodiment can be obtained. Further, in the fourth embodiment, the primer 20b for preventing water absorption is applied to the lower surface of the upper block 10c ', whereby the water absorption preventing state can be maintained for a long time and the quality of the joint 20 can be improved.

  That is, conventionally, in such a case, water is sprayed, and it is important to take measures to prevent water absorption since the lower surface of the upper block 10c ′ is a reverse strike surface at the time of clogging. Water is sprayed on the ground with 10c 'lying down sideways. This is because spraying water upward toward the lower surface in a state where the block 10c 'is lifted has a problem in reliability and safety.

  However, it takes time (for example, about 1 hour or more) from the spraying of water on the lower surface of the upper block 10c ′ to the placement of the block 10c ′ and the filling of the space between the upper and lower blocks 10c, 10c ′. During this time, the lower surface of the block 10c ′ may be dried. Therefore, in this embodiment, the water absorption preventing state is maintained for several days by spraying not the water but the primer 20b having a water absorption preventing effect on the lower surface of the upper block 10c '. In this embodiment, the primer 20a is also applied to the upper surface of the lower block, but water may be sprayed on this surface instead of the primer 20a.

[Fifth Embodiment]
As the fifth embodiment, an example in which the configuration of the block for forming the wall bottom is different will be described.

  In the precast block 10d in FIG. 11A, the inner side surface of the main body is a surface along the vertical direction (hereinafter referred to as a vertical surface), while the upper portion of the outer side surface of the main body is inclined with respect to the vertical direction. 101. The lower part of the outer side surface is a vertical surface.

  In the main body, the PC steel material 12 in the longitudinal direction is disposed to be inclined along the inclined portion 101. The upper end portion of the PC steel material 12 is fixed to the concave portion 11 on the upper surface of the main body of the block 10d by the fixing portion 13. The lower end portion is fixed to the concave portion 11 on the lower surface of the main body by the fixing portion 13.

  The precast block 10e in FIG. 11 (b) is different from the block 10d in FIG. 11 (a) in that a longitudinal PC steel material 12 along the inner side surface which is a vertical surface is further arranged. The upper end portion of the PC steel material 12 is fixed by the fixing portion 13 to the concave portion 11 on the upper surface of the main body of the block 10e. The lower end portion is fixed to the concave portion 11 on the lower surface of the main body by the fixing portion 13.

  In the precast block 10 f in FIG. 12A, the middle portion in the vertical direction of the outer side surface of the main body is an inclined portion 101. The upper and lower portions of the outer side surface and the inner side surface are vertical surfaces.

  Two PC steel materials 12 in the longitudinal direction are provided in the main body. One PC steel material 12 is inclined and arranged along the inclined portion 101 on the outer side surface. The lower end portion of the PC steel material 12 is fixed to the concave portion 11 on the lower surface of the main body by the fixing portion 13, and the upper end portion is fixed in the main body by the fixing portion 13.

  The other PC steel material 12 is arranged along the inner side surface which is a vertical surface, and the upper end portion is fixed to the concave portion 11 on the upper surface of the main body by the fixing portion 13. The lower end is fixed in the main body by the fixing unit 13.

  The main body of the precast block 10g in FIG. 12B is substantially the same as that of the block 10f in FIG. 12A, but one PC steel material 12 in the vertical direction is provided in the main body. The PC steel material 12 is bent toward the outer side surface in the longitudinal direction, and the upper portion of the PC steel material 12 is disposed along the inner side surface which is a vertical surface, but the lower portion is inclined toward the outer side surface. The upper end portion of the PC steel material 12 is fixed to the concave portion 11 on the upper surface of the main body by the fixing portion 13, and the lower end portion is fixed to the concave portion 11 on the lower surface of the main body by the fixing portion 13.

  The precast block 10h in the left diagram in FIG. 12C is different from the block 10f in FIG. 12A in that the PC steel material 12 provided along the inner side surface is folded back at the middle folded portion 12a. As shown in the right figure, the PC steel material 12 is folded in a U shape in the folded portion 12a, and both end portions of the PC steel material 12 are fixed to the concave portion 11 on the upper surface of the main body by the fixing portion 13.

  Even when these blocks are used, the same effects as those of the first embodiment can be obtained. As described above, the configuration of the block can be variously determined, and may be appropriately determined in consideration of the force applied to the wall bottom 6a and the like.

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

10, 10 ', 10a, 10b, 10c, 10c', 10d, 10e, 10f, 10g, 10h; Precast block 2, 6, 60, 61, 62; Liquid breakwater 2a, 6a; Wall body bottom 2b, 6b; Upper part 3a; Inner tank 3b; Outer tank 4; Pile 5; Bottom slab 5a; Grooves 5b and 17; Hole 7; Ground 11; Recess 12; PC steel material 12a; Joint 20a, 20b; primer 21; filler 100; LNG tank 101;

Claims (10)

A wall construction method for constructing a wall,
A concrete precast block is arranged on the bottom plate to form a wall bottom, and an upper portion of the wall bottom is formed of concrete, and passes through the precast block at the bottom of the wall and the upper portion of the wall bottom. Build the wall by introducing pre-stress with the first longitudinal tension material ,
The wall construction method, wherein the precast block is prestressed before being placed on the bottom plate by a second longitudinal tension material fixed at both ends to the precast block. The precast block is disposed on a groove formed in the bottom plate and having a width larger than the thickness of the precast block;
The wall construction method according to claim 1, wherein a filler is filled in a gap between the groove and the precast block.   The wall construction method according to claim 2, wherein the precast block and the bottom plate are connected by a connecting material. The wall is cylindrical;
A plurality of the precast blocks are arranged side by side in the circumferential direction of the wall body,
The wall body construction method according to claim 1, wherein circumferential prestress is introduced into the wall body. The precast block has an inner side surface along the vertical direction and an outer side surface including an inclined portion inclined with respect to the vertical direction,
The wall construction method according to any one of claims 1 to 4, wherein the second longitudinal tension material includes a PC steel material disposed along the inclined portion. The wall construction method according to claim 5, further comprising a PC steel material arranged along the inner side surface as the second longitudinal tension material. The upper part of the bottom of the wall is formed by a precast block made of concrete,
The wall construction according to any one of claims 1 to 6, wherein a length of the precast block at the bottom of the wall is longer than a length of the precast block at the upper portion. Method. The vertical length of the precast block at the bottom of the wall body is the same as the horizontal length of the precast block at the upper portion,
8. The wall construction method according to claim 7, wherein the length of the precast block at the bottom of the wall in the horizontal direction is the same as the length of the precast block at the upper portion in the vertical direction. The upper part of the bottom of the wall is formed by a precast block made of concrete,
Insert a reinforcing bar provided on the lower surface of the precast block in the upper part into the hole provided on the upper surface of the precast block at the bottom of the wall, and form a joint between the two precast blocks with a filling material,
The wall body according to any one of claims 1 to 8, wherein a primer for moisturizing is applied to a lower surface of the upper portion of the precast block before the reinforcing bar is inserted into the hole. Construction method. A wall body having a wall bottom formed by placing a concrete precast block on a bottom plate, and an upper portion of the wall bottom formed by concrete;
Prestress is introduced by a precast block at the bottom of the wall and a first longitudinal tension material passing through the upper portion of the bottom of the wall,
The precast block is a wall body in which prestress is introduced by a second longitudinal tension material having both ends fixed to the precast block.