JPH07268813A - Construction method of concrete structure - Google Patents

Abstract

PURPOSE:To construct a tower-like concrete structure with ease, and what is more, at low cost and in a short period. CONSTITUTION:An outer form member 7 is connected to the outer periphery side of an inner form member 6 with a spacing, thereby forming a precast block 5. A shear reinforcing material 11 is installed to the inner form member 6 and the outer form member 7 in the horizontal direction respectively. A longitudinal directional reinforcing material 8 vertically installed to a cast-in-place section 3 is being inserted into a hollow section 9 which comprises a clearance between the inner form member 6 and the outer form member 7 while they are laminated. Concrete K is cast to the hollow section 9 of the precast concrete block 5, thereby constructing a pier 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a concrete structure, and more particularly to a method of constructing a concrete structure suitable for constructing a tower structure such as a high pier or a large number of piers. It is a thing.

[0002]

2. Description of the Related Art Generally, for example, when constructing a pier, first, a pier foundation is constructed, and an axial reinforcing material and a shear reinforcing material are arranged on the upper portion of the pier foundation. A formwork was arranged so as to surround the shear reinforcement material, and concrete was placed in the areas partitioned by the formwork.

[0003]

However, in the construction method in the above case, it is necessary to connect and assemble various reinforcing bars such as the axial reinforcing material and the shear reinforcing material. This effort was even greater for high piers and multiple piers.
In addition, complicated formwork work (various works such as transporting, assembling, demolding, dismantling, moving, cleaning, and final disposal of the formwork) on-site for placing concrete is required, and the concrete curing period is long. Was needed.

Further, in the case of constructing a bridge pier by the above-mentioned construction method, an extremely wide outer scaffolding and formwork support work is required at the time of assembling the reinforcing bar and the formwork. in this way,
In the conventional construction method of piers, a great deal of labor and cost are required, and the construction period is unavoidably prolonged, and such a problem is remarkable in high piers and a large number of piers.

The present invention has been made in view of the above circumstances, and even a high pier or a large number of piers can be constructed easily and at low cost, in a short period of time, and safely. The purpose is to provide a construction method for a concrete structure.

[0006]

In order to achieve the above object, the method for constructing a concrete structure according to claim 1 comprises:
A plurality of double cylinder-shaped precast blocks including a cylindrical inner mold member and a cylindrical outer mold member that is connected to the outer periphery of the inner mold member at intervals with the inner mold member. An axial reinforcing material is inserted into the hollow portion formed by the gap between the outer mold member and the outer mold member so as to stand upright and laminated, and concrete is poured into the hollow portions of these precast blocks. Further, the construction method for a concrete structure according to claim 2 is the construction method for a concrete structure according to claim 1, wherein shear reinforcements are horizontally arranged on the inner mold member and the outer mold member, respectively. It is characterized by being set up.

Furthermore, the construction method of a concrete structure according to claim 3 is the construction method of a concrete structure according to claim 1 or 2, wherein the precast block is laminated to another precast block. It is characterized in that a guide for positioning each other in the horizontal direction is provided. Further, a construction method of a concrete structure according to claim 4 is the construction method of a concrete structure according to claim 3, wherein the guide is provided on an inner peripheral side surface of the inner form member, and a tip portion thereof is a precast block. It is characterized by comprising a guide member protruding upward or downward.

[0008]

According to the method for constructing a concrete structure according to claim 1, the precast block is assembled upward while inserting the axial reinforcing material into the hollow part, and the precast block is assembled into the hollow part of the precast block. A pier is constructed by placing the. Also,
According to the method for constructing a concrete structure according to claim 2, assembling the precast block upward while inserting the axial reinforcing material into the hollow part, and pouring concrete into the hollow part of the assembled precast block. This will build a pier that incorporates shear reinforcement.

Further, according to the method for constructing a concrete structure according to the third aspect, when the precast blocks are laminated to construct the pier, the upper and lower precast blocks are positioned horizontally by the guide. According to the method for constructing a concrete structure according to claim 4, when the precast blocks are laminated to construct the bridge pier, the guide member of the lower precast block is inside the inner frame member of the upper precast block. The guide members enter the peripheral side, and the guide members stack the upper and lower precast blocks in a horizontally positioned state.

[0010]

EXAMPLE An example of a pier construction method will be described below as an example of the concrete structure of the present invention with reference to the drawings. 1 and 2, reference numeral 1 is a pier assembled by the construction method of the embodiment. This pier 1
Is composed of a cast-in-place part 3 constructed by cast-in-place on the upper part of the pier foundation 2 and a precast part 4 constructed on the cast-in-place part 3. The precast unit 4 is composed of a plurality of precast blocks 5, and is composed by stacking these precast blocks 5.

As shown in FIG. 3 to FIG. 7, the precast block 5 is provided with an inner mold member 6 formed in a rectangular shape in plan view and a space on the outer peripheral side of the inner mold member 6. A hollow structure in which an axial reinforcing member 8 is arranged and concrete K is placed between the inner mold member 6 and the outer mold member 7. It is defined as part 9. A plurality of shear reinforcement members 11 are arranged inside the inner mold member 6 and the outer mold member 7, and the shear reinforcement members 11 are connected to each other by an assembly rebar 12. Guide members (guides) 13 are fixed to respective corners on the inner peripheral side of the inner mold frame member 6 in the vicinity of the upper portions thereof, and a part of each of the guide members 13 is projected upward. Then, these guide members 13 are formed on the inner mold member 6 of the precast block 5 stacked on top.
The upper and lower precast blocks 5 are positioned relative to each other in the horizontal direction by allowing the precast blocks 5 to enter into the inner peripheral corners.

Next, a method for constructing a bridge pier for constructing the pier 1 having the above structure will be described with reference to FIGS. 8 to 11 along the procedure thereof. (1) First, after constructing the pier foundation part 2, the cast-in-place part 3 is constructed by cast-in-place concrete for about several meters, and the axial reinforcing material 8 is projected above it (see FIG. 8). (2) Next, a new axial reinforcing material is connected to the axial reinforcing material 8, and the precast block 5 is sequentially laminated on the cast-in-place part 3 by a predetermined number of layers from the bottom by a crane or the like (see FIG. 9). . Here, when the precast blocks 5 are assembled, the axial reinforcing members 8 erected on the cast-in-place parts 3 are provided in the hollow portions 9 of these precast blocks 5.
Insert. When laminating these precast blocks 5, the guide member 13 of the lower precast block 5 is inserted into the corner portion of the inner frame member 6 of the precast block 5 to be laminated above. In this case, the precast block 5 laminated on the upper portion may be provided with a guide member protruding downward.

(3) When the precast blocks 5 having a predetermined number of steps (the number of steps up to a height of about 10 m) are assembled, the concrete K is inserted into the hollow portions 9 of these precast blocks 5.
To place. (4) The operations of (2) and (3) above are repeated to build the pier 1 by the precast block 5, and when the precast block 5 reaches the vicinity of the upper end of the axial reinforcing material 8, this axial reinforcing material An axial reinforcing member 8 is newly connected to the upper end portion of 8 and the operations (2) and (3) are repeated again to construct a pier 1 having a predetermined height. The bridge is completed by supporting the girder by the pier 1 thus constructed.

Here, when the girder that can be bridged over the bridge pier 1 is accompanied by a truss (when an existing bridge girder is hung), as shown in FIG. 10, a solid trough 15 is placed at the top of the constructed pier 1. If a girder is installed on the trough seat 15 and has a rigid frame structure (when a RC girder or a PC girder is cast in the field), it is placed at the top of the constructed pier 1 as shown in FIG. A concrete or hollow top plate 15 is provided and a member 16 for integrating the girder and the bridge pier is projected to pour concrete.

As described above, according to the construction method for the concrete structure of this embodiment, the relatively thin inner mold member 6 and the outer mold member 7 are separated from each other by the shear reinforcement member 11 and the assembled rebar 12. Since the pier 1 is constructed by stacking the integrated precast blocks 5 that are extremely lightweight and easy to handle, the construction work of the pier 1 can be made extremely easy, and the formwork work, In other words, it is possible to eliminate extremely complicated various operations such as transporting, assembling, demolding, dismantling, moving, cleaning, and final disposal of the formwork, and it is possible to reduce the number of field workers, particularly skilled workers. . In addition, the period for curing concrete can be shortened, and by these,
The number of site workers can be reduced and the construction period can be shortened. Furthermore, it is possible to eliminate the need for a huge amount of scaffolding and the supporting work for supporting the formwork, and it is possible to save the labor required to install these scaffolding and supporting work.

Further, since the outer surface of the pier 1 can be constituted by the precast block 5, the pier 1 having excellent durability against the outside air can be obtained. Further, the precast block 5 in which the shear reinforcement material 11 is arranged in advance.
Since the axial reinforcing member 8 is inserted into the hollow portion 9 of the precast block 5 and the concrete K is cast into the hollow portion 9 of the assembled precast block 5, the shear reinforcing member 1
1 and an axial reinforcing member 8 can be built into the high-strength bridge pier 1, and the work of arranging the shear reinforcing member 11 on the site can be omitted, and further labor saving of the building work can be achieved. You can Further, since the guide members 13 for positioning the precast blocks 5 to be stacked on top are provided at the corners of the inner mold member 6 of each precast block 5, when these precast blocks 5 are stacked on each other. Not only can workability be improved, but also the stacking precision of these precast blocks 5 can be improved.

The guide member 1 is used as a guide for positioning the precast block 5 in the horizontal direction.
The number of the precast blocks 5 is not limited to 3, and for example, as shown in FIG. 12, a positioning guide 17 may be provided by a steel material such as L-shaped steel and the upper and lower precast blocks 5 to be stacked may be positioned in the horizontal direction. . Further, in the above-mentioned embodiment, the precast block 5 having a square-shape in plan view is used, but the precast block 5 may have a cylindrical shape. In this case, a cylindrical pier should be constructed. You can

[0018]

As described above, according to the method for constructing a concrete structure of the present invention, the following effects can be obtained. According to the method for constructing a concrete structure according to claim 1, a double-cylinder-shaped precast block is assembled upward while an axial reinforcing material is inserted into the hollow part of the precast block, and the precast block is assembled into the hollow part of the concrete. It is possible to construct a concrete structure very easily by driving. That is, the construction work of the concrete structure can be made extremely easy, and the formwork work, that is, the formwork transportation, assembly, demolding, dismantling, moving, cleaning, final disposal, etc. is extremely complicated. Various work can be made unnecessary, field workers,
Particularly, skilled workers can be reduced. In addition, the period for curing concrete can be shortened, which can reduce the number of site workers and
The work period can be shortened. Furthermore, it is possible to eliminate the need for a huge amount of external scaffolds and the formwork support work for supporting the formwork, and to save the labor required to install these scaffolding and support work. it can.
Further, since the outer surface of the concrete structure can be constituted by the precast block, the concrete structure having excellent durability against the outside air can be obtained.

According to the method for constructing a concrete structure as claimed in claim 2, the precast block is assembled upward while inserting the axial reinforcing material into the hollow portion of the precast block in which the shear reinforcing material is previously arranged, and the assembled precast block. Since concrete is placed in the hollow part of the building, it is possible to construct a high-strength concrete structure in which shear reinforcement and axial reinforcement are incorporated into the concrete structure, and at the same time the shear reinforcement is placed on site. Can be omitted, and further labor saving of the construction work can be achieved. According to the method for constructing a concrete structure according to claim 3, when precast blocks are laminated to construct a concrete structure, it is possible to position each precast block with a guide very easily. The workability in stacking the blocks can be further improved, and the stacking accuracy of these precast blocks can also be improved.

According to the method for constructing a concrete structure of claim 4, the precast blocks are laminated to construct the concrete structure so that the precast blocks on one side are provided on the inner peripheral side surface of the inner formwork member. The guide member is inserted into the inner peripheral side of the inner frame member of the precast block on the other side, and the precast blocks stacked by this guide member are stacked in a state of being positioned in the horizontal direction under the visual observation of the operator. It is possible to further improve the workability in stacking these precast blocks, and further improve the stacking accuracy of these precast blocks and the safety of the stacking work.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a pier explaining a method for constructing a concrete structure according to an embodiment of the present invention.

FIG. 2 is a side view of a pier explaining a construction method for a concrete structure according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a pier explaining a construction method for a concrete structure according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view of the precast block taken along the line AA for explaining the construction method for the concrete structure of the embodiment of the present invention.

FIG. 5 is a BB cross-sectional view of the precast block explaining the construction method for the concrete structure of the example of the present invention.

FIG. 6 is a C-C cross-sectional view of the precast block explaining the construction method for the concrete structure of the embodiment of the present invention.

FIG. 7 is a DD cross-sectional view of the precast block illustrating the construction method for the concrete structure according to the embodiment of this invention.

[Fig. 8] Fig. 8 is a side view and a cross-sectional view of a cast-in-place unit for explaining a bridge pier construction procedure by the concrete structure construction method according to the embodiment of the present invention.

[Fig. 9] Fig. 9 is a side view and a cross-sectional view of a pier illustrating a procedure for constructing a pier by a construction method for a concrete structure according to an embodiment of the present invention.

FIG. 10 is a side view and a cross-sectional view of the upper portion of the pier for explaining the procedure for constructing the pier by the construction method for the concrete structure of the embodiment of the present invention.

FIG. 11 is a side view and a cross-sectional view of the upper portion of the pier for explaining the procedure for constructing the pier by the concrete construction method of the embodiment of the present invention.

FIG. 12 is a plan view of another precast block used in the method for constructing a concrete structure according to the example of the present invention.

[Explanation of symbols]

 1 Bridge pier (concrete structure) 5 Precast block 6 Inner formwork member 7 Outer formwork member 8 Axial reinforcement 9 Hollow part 11 Shear reinforcement 13 Guide member (guide) K Concrete

Claims (4)

[Claims] 1. A plurality of double-cylinder-shaped precast blocks comprising a cylindrical inner mold member and a cylindrical outer mold member connected to the outer periphery of the inner mold member at intervals. An axial reinforcing material is vertically inserted through a hollow portion formed by a gap between the inner mold member and the outer mold member, and concrete is poured into the hollow portions of these precast blocks. Construction method for concrete structures. 2. The method for constructing a concrete structure according to claim 1, wherein shear reinforcements are horizontally arranged on the inner mold member and the outer mold member, respectively. 3. The concrete structure according to claim 1, wherein the precast block is provided with a guide for horizontally positioning the precast block with respect to another precast block to be laminated. Construction method. 4. The concrete according to claim 3, wherein the guide is provided on an inner peripheral side surface of the inner formwork member, and a tip end portion thereof is a guide member protruding upward or downward of the precast block. Construction method for structures.