JP2016156248A - Concrete structure construction method and concrete structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economical and high-quality concrete structure construction method or the like.SOLUTION: An outer peripheral section 11 of a concrete structure 1 is constructed by placing concrete with dense arrangement of main reinforcement 111. Then, the concrete structure 1 is constructed by placing the concrete in an inner section 12 inside the outer peripheral section 11. The concrete for the outer peripheral section 11 develops high strength after the same is cured and has a large slump value. The concrete for the inner section 12 develops lower strength than the concrete for the outer peripheral section 11 after the same is cured and has a lower slump value than the concrete for the outer peripheral section 11.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for constructing a concrete structure and a concrete structure.

  The strength of concrete used in mass concrete structures such as large-diameter deep foundation piles, piers, sluice weir pillars, etc. is required in the most severe part against the limit state under the action of external force such as bending and shearing. Often determined by value. From the viewpoint of workability, the workability of the concrete to be used is determined from the fillability in the densely arranged portion.

  In large-diameter deep foundation piles, piers, sluice weir pillars, etc., the main reinforcing bars for securing the bending strength are densely arranged on the outer periphery, and the intermediate rebars are sparsely arranged inside. When bending is applied, the maximum bending compressive stress level acts on the compression edge, and the compression stress acts on a certain range from the compression edge to the inside. The workability and strength of the concrete used are determined by the densest bar arrangement and the maximum degree of compressive stress assumed during design in the same structure. That is, in the structure as described above, the performance of the entire concrete is determined from the condition of the limited range of the outer peripheral portion, and the performance is excessive for the other most.

  In recent years, as a structural form that enhances the seismic performance of RC (steel reinforced concrete) structures, there is one using concrete using fiber as a reinforcing material as an outer shell. For example, Patent Document 1 discloses a concrete structure made of a precast member formed by mixing reinforcing short fibers with concrete and concrete placed inside the precast member.

  In Patent Document 2, as a further development of such a structure, a plurality of precast members made of ultra-high-strength fiber reinforced concrete (hereinafter referred to as UFC) are arranged on the plastic hinge portion of the RC structure to cover the cover portion. It is described that forming UFC with UFC suppresses collapse of the core concrete and buckling of the main rebar, and realizes high deformation performance.

JP-A-10-147976 JP 2008-0225248

  In Patent Documents 1 and 2, main reinforcing bars and band reinforcing bars are arranged inside the precast member, and concrete is placed. In this case, as described above, the strength and workability of the concrete to be used are determined by values required in a critical part, which is uneconomical.

  In addition, although Patent Documents 1 and 2 use precast members, compaction with a vibrator is indispensable at the time of construction in the same way as normal concrete placement, and it is necessary to ensure quality and secure construction personnel, reducing the risk of initial defects. There was also a problem that it did not lead to reduction of construction personnel and improvement of productivity.

  Moreover, in mass concrete structures, there is a risk of temperature cracking due to the heat of hydration of the concrete inside, and there is a concern that cracking may occur even if the outside is restrained by a precast member made of UFC. Furthermore, when building a mass concrete structure, the amount of concrete is enormous, so concrete placement will be performed in multiple steps, each time a horizontal joint is formed, It becomes a weak point.

  The present invention has been made in view of the above problems, and an object thereof is to provide an economical and high-quality method for constructing a concrete structure.

  1st invention for solving the subject mentioned above is the construction method of a concrete structure, Comprising: The outer periphery of the said concrete structure containing the steel material which continues between the upper-lower ends of the said concrete structure in the vertical direction It is the construction method of the concrete structure characterized by constructing a part in advance and then constructing the inside of the concrete structure.

  In the present invention, it is possible to use different concrete for the outer peripheral portion and the inner portion by constructing the outer peripheral portion of the concrete structure in advance and placing the inner concrete afterwards. Therefore, the concrete according to the performance requested | required in each part can be used, and an economical and high quality concrete structure can be constructed | assembled.

  It is desirable that the outer peripheral portion of the concrete structure is constructed by in-situ concrete.

  In the present invention, even if the quantity of concrete that can be placed at one time is the same, placement can be performed to a high position at a time because the cross-sectional area of the outer peripheral portion is small. As a result, the number of horizontal joints is reduced, and improvement in durability can be expected.

  The outer peripheral portion of the concrete structure is preferably constructed by placing concrete using a reinforcing material for reinforcing the concrete structure on the inside as an embedded formwork.

  By using an embedded formwork that functions as a reinforcing material for concrete structures, it is possible to eliminate the demolding work during construction of the concrete structure, and to support the work by using an embedded formwork with appropriate settings for rigidity and bending strength. It leads to omission of. Furthermore, after the concrete is placed, the embedded formwork integrated with the concrete structure functions as a reinforcing material, thereby contributing to an improvement in the proof stress of the structure and a reduction in steel materials to be used.

  It is desirable to use different concrete for the outer periphery and the inside of the concrete structure. For example, concrete having a lower slump and poorer blend than the concrete used for the outer peripheral portion is used in the concrete structure.

  In the present invention, for example, a concrete having a workability that can realize a satisfactory filling property even if the reinforcement is dense and the strength necessary for the limit state is used for the concrete in the outer peripheral portion. On the other hand, the required strength of the internal concrete may be lower than that of the outer peripheral portion, and the workability may be low because the reinforcement is rough. By constructing the outer perimeter that requires high performance but low usage and the interior that requires low performance but high usage with concrete according to each required performance, construction costs are lower than conventional methods. Reduction and quality improvement effects can be expected. Moreover, the internal concrete which occupies most can be made into cheap concrete, and material cost can be reduced. Furthermore, by making the internal concrete into poor blended concrete with a small amount of cement, the heat of hydration when the concrete hardens can be reduced, and the risk of temperature cracking can be reduced.

  It is desirable to use aggregate and cement made of coal ash for the concrete inside the concrete structure.

  When using aggregate or cement made of coal ash as a raw material, it is less expensive than ordinary concrete, and it is preferable from the viewpoint of environment in that waste discharged from a thermal power plant can be effectively used. On the other hand, however, there is a problem that variations in strength and workability are large. On the other hand, since the present invention does not require high strength and workability for the internal concrete, it is suitable for applying the concrete as described above. Thereby, compared with the conventional method, the reduction effect of the cost at the time of construction of a concrete structure and an environmental load can be anticipated.

  The inside of the concrete structure is preferably constructed of pre-packed concrete.

  Prepacked concrete is also suitable because the inside of the concrete structure is rough and the volume is large. Pre-packed concrete is a type in which large-diameter aggregate, concrete glass, blocks, etc. are introduced in advance, and mortar material is post-filled into the gaps, which can save labor and improve productivity and safety. It is effective in improving The effect of reducing the risk of temperature cracking by reducing the heat of hydration is also great. Furthermore, if an aggregate or the like is input in accordance with the internal reinforcement work, the scaffold is secured by the aggregate, so that it is not necessary to construct a separate work scaffold. In addition, it is necessary to procure ready-mixed concrete from multiple plants if the amount of concrete is large at the time of placing concrete, but since mortar to be filled later can be manufactured at a simple plant on site, mortar material of stable quality There is also an advantage that can be supplied stably.

  In addition, it is desirable that a contracting force for contracting the planar shape of the outer peripheral portion is introduced into the outer peripheral portion of the concrete structure, and an expansion material is used for the concrete inside the concrete structure.

  In this case, the strength of the structure can be increased by the confinement effect due to the shrinkage force of the outer peripheral portion of the concrete structure and the expansion force of the internal concrete.

  Furthermore, it is desirable to provide a protruding material that protrudes inward from the outer periphery of the concrete structure.

  Thereby, there is an effect of preventing the outer peripheral portion from being squeezed out by the frictional force between the protruding member and the concrete inside or the mechanical fixing force.

  2nd invention is the concrete structure constructed | assembled by the construction method of the concrete structure of 1st invention.

  According to the present invention, it is possible to provide a method for constructing an economical and high-quality concrete structure.

Figure showing concrete structure 1 The figure which shows the section of concrete structure 1 The figure explaining the construction method of concrete structure 1 Diagram showing concrete structure 1a Diagram showing concrete structure 1b The figure which shows the embedded formwork 113,113 ' The figure which shows concrete structure 1c and 1d The figure shown about construction of perimeter part 11a by precast block 116 The figure shown about construction of perimeter part 11b by precast block 118 Diagram showing concrete structure 1e The figure explaining the construction method of concrete structure 1e Diagram showing concrete structures 1f and 1g

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

[First embodiment]
(1. Concrete structure 1)
Fig.1 (a), (b) is a figure which shows the concrete structure 1 which concerns on the 1st Embodiment of this invention. As shown in FIG. 1, the concrete structure 1 of this embodiment is a mass concrete structure constructed as a bridge pier or a large-diameter deep foundation pile. However, the application target of the present invention is not limited to this, and may be other mass concrete structures such as sluice weir pillars, or other concrete structures.

  FIG. 2 is a view showing a cross section of the concrete structure 1. 2A is a vertical section of the concrete structure 1, and FIG. 2B is a horizontal section of the concrete structure 1.

  The concrete structure 1 can have an elliptical or rectangular planar shape in addition to a cylindrical shape as shown in FIG. The diameter of the concrete structure 1 is, for example, 3 m or more, and the height is, for example, 5 m or more.

  A main reinforcing bar 111 and a band reinforcing bar (not shown) are embedded in the outer peripheral portion 11 in the plane of the concrete structure 1. The thickness of the outer peripheral part 11 is 0.5 m or more, for example. The main reinforcing bar 111 is a vertical steel material that is continuous between the upper and lower ends of the concrete structure 1. The main reinforcing bars 111 are densely arranged on the outer peripheral portion 11. The outer peripheral part 11 is constructed by cast-in-place concrete, and at that time, concrete having high strength after curing and a large slump value is used.

  On the other hand, reinforcing bars (not shown) such as intermediate band reinforcing bars are arranged sparsely in the inner part 12 inside the outer peripheral part 11 compared to the outer peripheral part 11. As the concrete of the inner portion 12, a concrete having a low slump value (low slump) having a lower strength after curing than the concrete of the outer peripheral portion 11 is used. It should be noted that the concrete in the inner portion 12 has a lower unit cement amount and is poorly blended than the concrete in the outer peripheral portion 11.

(2. Construction method of concrete structure 1)
Next, the construction method of the concrete structure 1 is demonstrated with reference to FIG.

  In this embodiment, the outer peripheral part 11 of the concrete structure 1 is constructed in advance. That is, after the main reinforcing bars 111 and the strip reinforcing bars (not shown) of the outer peripheral portion 11 are arranged, the inner mold frame and the outer mold frame (not shown) are assembled, and the concrete of the outer peripheral portion 11 is placed at a certain height. . After the concrete is hardened, the inner and outer molds are removed. This state is shown in FIG.

  As shown in FIG. 3 (b), the concrete in the outer peripheral portion 11 is placed in several times while performing the reinforcement in the outer peripheral portion 11 such as adding the main reinforcing bars 111 as necessary. The outer peripheral portion 11 of the object 1 is constructed for the entire height. The concrete used for the outer peripheral portion 11 is selected to have a high strength after hardening and a large slump value according to the bending applied to the concrete structure 1 and the state of reinforcement of the main reinforcing bar 111 and the like. For the reinforcing bars (not shown) of the inner portion 12 described above, for example, the reinforcing bars can be arranged according to the progress of the construction of the outer peripheral portion 11.

  Thereafter, as shown in FIG. 3C, the concrete in the interior 12 is placed. Thereby, the concrete structure 1 is constructed.

  As described above, in the present embodiment, the outer peripheral portion 11 of the concrete structure 1 is constructed in advance, and the concrete in the inner portion 12 is post-placed, so that different concrete is formed in the outer peripheral portion 11 and the inner portion 12. Can be used. Therefore, the concrete according to the performance requested | required in each part can be used, and an economical and high quality concrete structure can be constructed | assembled.

  For bending acting on the concrete structure 1, the largest compressive stress acts on the outermost edge on the compression side of the concrete structure 1. For this, it is effective to increase the strength by reducing the water-cement ratio of concrete, but on the other hand, the occurrence of temperature cracks due to an increase in heat of hydration becomes a problem. Therefore, only the concrete used for the outer peripheral portion 12 is increased in strength, the strength of bending is not required, and the concrete in the interior 12 where the amount of placement is large is low in strength and low in heat of hydration, unit cement amount It is possible to suppress temperature cracking while securing necessary structural performance by using poor blended concrete with a small amount.

  Moreover, what has the high workability which can implement | achieve favorable filling property can be used for the concrete of the outer peripheral part 11 even if reinforcement is dense. On the other hand, the inner 12 has a coarser arrangement than the outer peripheral portion 11, so that the workability of the concrete can be lowered by reducing the unit water amount.

  As described above, the outer peripheral portion 11 that requires high performance but uses a small amount and the interior 12 that requires low performance but has a large amount of use are constructed of concrete according to the required performance. Compared to, it can be expected to reduce construction costs and improve quality. Moreover, the concrete of the interior 12 which occupies most can be made into cheap concrete, and material cost can be reduced.

  Furthermore, since the cross-sectional area of the outer peripheral part 11 is small, even if the quantity of the concrete which can be poured at once is the same, it can be poured to a high position at once. As a result, the number of horizontal joints is reduced, and the durability of the concrete structure 1 can be expected to be improved.

  In addition, even when the shearing force acting on the concrete structure 1 is large and the amount of reinforcement of the intermediate strip reinforcing bar in the inner portion 12 is increased in order to ensure sufficient shear strength, the reinforcing strip disposed in the outer peripheral portion 11 By using a high-strength reinforcing bar and a large-diameter reinforcing bar, the intermediate band reinforcing bar can be omitted. By applying high-strength concrete to the outer peripheral portion 12 as in this embodiment, the adhesion between the reinforcing bars of the outer peripheral portion 12 and the concrete is increased, which is effective.

  However, the present invention is not limited to this. For example, aggregate and cement made of coal ash can be used for the concrete in the interior 12 of the concrete structure 1. When using aggregate or cement made of coal ash as a raw material, it is less expensive than ordinary concrete, and it is preferable from the viewpoint of environment in that waste discharged from a thermal power plant can be effectively used. However, on the other hand, there is a problem that variations in strength and workability are large and shrinkage is large. On the other hand, in this embodiment, high strength and workability are not required for the concrete in the interior 12, and there is a restraining effect by the outer peripheral portion 11, which is suitable for applying the concrete as described above. Thereby, compared with the conventional method, the reduction effect of the cost at the time of construction of the concrete structure 1 and an environmental load can be anticipated.

  Hereinafter, other examples of the present invention will be described as second to fifth embodiments. In these embodiments, differences from the embodiments described so far will be mainly described, and the same points will be denoted by the same reference numerals in the drawings and the like, and description thereof will be omitted. In addition, the configurations of the respective embodiments including the first embodiment described above can be used in combination with each other as necessary.

[Second Embodiment]
FIG. 4 is a view showing a concrete structure 1a of the second embodiment. In the concrete structure 1 a, a circumferential tension member 112 is provided on the outer peripheral portion 11, and circumferential prestress is applied to the outer circumferential portion 11 by the tension member 112. Further, an expansion material is used for the concrete in the interior 12.

  The construction method of the concrete structure 1a is substantially the same as in the first embodiment. The tension material 112 is disposed, for example, when the outer peripheral portion 11 is constructed, and is tensioned and prestressed after the outer peripheral portion 11 is constructed. Thereafter, the concrete inside 12 is placed.

  In this embodiment, the same effect as that of the first embodiment can be obtained. In addition, by applying a prestress in the circumferential direction to the outer peripheral portion 11 of the concrete structure 1a, a contracting force for contracting the planar shape of the outer peripheral portion 11 is introduced, and combined with the expansion force of the concrete in the inner portion 12 The strength of the concrete structure 1a can be increased by the confining effect.

[Third embodiment]
FIG. 5 is a diagram showing a concrete structure 1b according to the third embodiment. In this concrete structure 1b, the inner mold form at the time of concrete placement of the outer peripheral portion 11 is used as an embedded mold form 113, and this embedded mold form 113 is used as a reinforcing material for the concrete structure 1b.

  The construction method of the concrete structure 1b is substantially the same as that of the first embodiment, but differs in that an embedded mold 113 is used as an inner mold at the time of placing concrete.

  As the embedded form 113, a high-strength steel material that functions as a reinforcing material (tensile material) for the concrete structure 1b is used. For example, as shown in FIG. 6A, an H steel frame 113a is used as a guide, and a concrete formwork block 113b is inserted between them to form an embedded formwork 113 shown in FIG. 6B. By using fiber reinforced concrete for the formwork block 113b, the interval between the H steel frames 113a can be increased, and the number thereof can be reduced. As shown in the embedded form 113 'of FIG. 6 (c), it is also possible to provide a projecting material such as a perforated steel plate diver 113c on the surface of the H steel frame 113a for integration with the concrete in the interior 12.

  Also in this embodiment, the same effect as the first embodiment can be obtained. Further, by using the embedded form 113 that functions as a reinforcing material for the concrete structure 1b, the demolding work at the time of constructing the concrete structure 1b can be omitted, and the embedded form 113 having appropriately set rigidity and bending strength. Using this will lead to omission of support work. Furthermore, after the concrete is placed, the embedded formwork 113 integrated with the concrete structure 1b functions as a reinforcing material, thereby contributing to an improvement in yield strength against bending of the concrete structure 1b and reducing the main rebar 111 and the like. Is also connected.

  The buried form is not limited to the above. For example, the embedded form 113 may be a steel sheet pile. It is also possible to provide a protruding material such as a perforated steel plate dowel similar to that shown in FIG. 6C on the surface of the steel sheet pile.

  Further, as shown in the concrete structure 1c in FIG. 7A, the embedded form 13 projects inward from the outer peripheral portion 11 to the vicinity of the central portion of the inner portion 12 and has a flat protrusion with a large protruding length. It is also possible to provide the material 114. This projecting member 114 is provided with a hole 114a. Like the strip material used in the tail arme method, the inner 12 is displaced by friction between the concrete in the inner 12 and the projecting material 114 or by filling the hole 114a with concrete. This has the effect of suppressing and preventing the outer peripheral portion 11 from sticking out.

  Further, as shown in the concrete structure 1d in FIG. 7B, a tension material 115 may be provided so as to connect between the embedded molds 113, and a tensile force may be introduced between the embedded molds 113 on both sides. . Thereby, like 2nd Embodiment, the contraction force which is going to contract the planar shape of the outer peripheral part 11 can be introduce | transduced, and the contraction force of the outer peripheral part 11 can be used by using an expansion material for the concrete of the inside 12. The strength of the concrete structure 1d can be increased by the confinement effect due to the expansion force of the concrete in the interior 12.

[Fourth Embodiment]
4th Embodiment is an example which builds the outer peripheral part of a concrete structure using a precast block.

  In this embodiment, the outer peripheral part of a concrete structure is constructed | assembled using the precast block 116 (henceforth a block) shown to Fig.8 (a).

  A vertical vertical reinforcing bar 116a and a horizontal horizontal reinforcing bar 116b are provided inside the block 116, and the vertical reinforcing bar 116a and a joint 116c continuous with the horizontal reinforcing bar 116b protrude from the upper, lower, left and right side surfaces of the block 116. Yes. In the present embodiment, for each of the upper and lower joints 116c and the left and right joints 116c, one is a male joint and the other is a female joint.

  In the present embodiment, for example, the blocks 116 are moved as indicated by the arrows in FIG. 8A, and the joints 116c of the blocks 116 adjacent in the vertical and horizontal directions are connected. By repeating this, the blocks 116 are arranged side by side vertically and horizontally, and as shown in FIG. 8 (b), the concrete is placed between the blocks 116 to form joints 117, whereby the outer peripheral portion 11a of the concrete structure is formed. Is built. The vertical reinforcing bars 116a of the upper and lower blocks 116 are connected by a joint 116c and are continuous in the vertical direction between the upper and lower ends of the concrete structure. Inside the concrete structure, concrete is placed in the same manner as in the first embodiment.

  Thus, in this embodiment, the outer peripheral part 11a is constructed using the precast block 116. The block 116 can be manufactured in advance in a factory or on-site, and it is possible to omit the work of arranging densely arranged bars and the work of placing concrete, which are troublesome in construction and cause quality troubles. Moreover, the outer peripheral part 11a that greatly affects the structural performance and durability is constructed by assembling and constructing a precast product manufactured in a controlled state, thereby contributing to an improvement in the quality of the entire concrete structure.

  In this embodiment, the block 116 in which reinforcing bars are embedded in advance is used. However, as shown in FIG. 9, the outer peripheral portion 11b is constructed using a precast block 118 provided with a vertical hole 118a by boxing or the like. Also good.

  In this case, the blocks 118 are arranged vertically and horizontally, the main reinforcing bars 119 are inserted into the corresponding holes 118a of the upper and lower blocks 118, and then the holes 118a are filled with a filler such as mortar or grout. The main reinforcing bar 119 is integrated with the block 118.

  As for the left and right blocks 118, for example, by providing a horizontal rebar similar to the above and a joint that continues from the horizontal rebar and protrudes from the left and right surfaces to the block 118, the left and right blocks 118 can be connected by the joint. A joint 120 made of mortar or the like is formed between the upper, lower, left and right blocks 118.

[Fifth Embodiment]
FIG. 10 is a view showing a concrete structure 1e according to the fifth embodiment. In the fifth embodiment, prepacked concrete 15 is used as the concrete in the interior 12. The prepacked concrete 15 is constructed, for example, by filling the gaps between the coarse aggregates 13 with mortar 14.

  In order to construct the concrete structure 1e, for example, as shown in FIG. 11 (a), the outer peripheral portion 11 is constructed at a constant height in the same manner as in the first embodiment, and then the inner side thereof is shown in FIG. 11 (b). As shown, coarse aggregate 13 is introduced. This operation is repeated, and as shown in FIG. 11 (c), the outer peripheral portion 11 is constructed for the entire height, and the coarse aggregate 13 for the entire height is put inside thereof. And as shown in FIG.11 (d), the concrete structure 1e is constructed | assembled by pouring the mortar 14 into the clearance gap between the coarse aggregates 13, filling and integrating.

  In this embodiment, the same effect as that of the first embodiment can be obtained. In the present embodiment, only the mortar 14 is placed in a fresh state in the interior 12. Since the mortar 14 does not require a compacting operation using a vibrator such as ordinary concrete, labor can be saved in the placing work, which is effective in improving productivity and safety. The effect of reducing the risk of temperature cracking by reducing the heat of hydration is also great. Furthermore, if the coarse aggregate 13 is input according to the bar arrangement work in the interior 12, the scaffold can be secured with the aggregate, and the labor and cost for constructing the separate work scaffold can be omitted. In addition, it is necessary to procure ready-mixed concrete from a plurality of plants when the amount of concrete is large at the time of placing concrete. However, since the mortar 14 to be filled later can be manufactured at a simple plant in the field, the mortar with stable quality. There is also an advantage that the material can be supplied stably.

  As the coarse aggregate 13, a large diameter aggregate having a maximum diameter of about 100 mm can be used. Further, concrete glass may be used in place of the coarse aggregate 13. Further, a concrete block having such a shape that a certain gap is ensured when thrown and stacked may be separately manufactured by precast and used instead of the coarse aggregate 13. As an example of such a shape, for example, a tetrapod-shaped concrete block can be used. The concrete block and the mortar 14 can also be made of a concrete material using coal ash.

  Further, as shown in the concrete structure 1f of FIG. 12A, it is also possible to provide a protruding member 121 similar to the protruding member 114 of FIG. The protruding member 121 is provided with a hole 121a as in the example of FIG. Furthermore, you may arrange | position the geotextile 122 which has a space | gap so that it may span between the outer peripheral parts 11, as shown to the concrete structure 1g of FIG.12 (b).

  As in the example of FIG. 7A, the protruding member 121 and the geotextile 122 also cause the displacement of the interior 12 by friction with the coarse aggregate 13 and the mortar 14 and filling the hole 121 a and the mortar 14 with the gap. This has the effect of suppressing and preventing the outer peripheral portion 11 from sticking out.

  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.

1, 1a, 1b, 1c, 1d, 1e, 1f, 1g; concrete structure 11, 11a, 11b; outer periphery 12; interior 13; coarse aggregate 14; mortar 15; 115; Tensile material 113, 113 '; Embedded mold 113a; H steel frame 113b; Form block 113c; Perforated steel plate gibel 114, 121; Protrusion 114a, 118a, 121a; Longitudinal reinforcing bar 116b; horizontal reinforcing bar 116c; joint 117, 120; joint 122; geotextile

Claims (10)

A method for constructing a concrete structure,
Including the steel material continuous in the vertical direction between the upper and lower ends of the concrete structure, the outer periphery of the concrete structure is constructed in advance,
Then, the construction method of the concrete structure characterized by constructing the inside of the concrete structure.   The method for constructing a concrete structure according to claim 1, wherein an outer peripheral portion of the concrete structure is constructed by cast-in-place concrete.   3. The concrete according to claim 2, wherein the outer peripheral portion of the concrete structure is constructed by placing concrete on the inside using a reinforcing material for reinforcing the concrete structure as an embedded formwork. How to build a structure.   The method for constructing a concrete structure according to any one of claims 1 to 3, wherein different concrete is used between an outer peripheral portion and an inside of the concrete structure.   5. The method for constructing a concrete structure according to claim 4, wherein the concrete structure has a lower slump and poorer composition than the concrete used for the outer periphery.   The method for constructing a concrete structure according to claim 4, wherein aggregate and cement made of coal ash are used for the concrete inside the concrete structure.   The method for constructing a concrete structure according to claim 4, wherein the inside of the concrete structure is constructed by prepacked concrete. While introducing a contraction force to contract the planar shape of the outer peripheral portion to the outer peripheral portion of the concrete structure,
The method for constructing a concrete structure according to any one of claims 1 to 7, wherein an expansion material is used for the concrete inside the concrete structure.   The method for constructing a concrete structure according to any one of claims 1 to 8, wherein a projecting material projecting inward from an outer peripheral portion of the concrete structure is provided.   The concrete structure constructed | assembled by the construction method of the concrete structure in any one of Claims 1-9.

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