JP2010112074A - Construction method of concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a concrete structure easily at a low cost, in constructing the concrete structure under weather conditions in need of heating curing or adiabatic curing. <P>SOLUTION: This construction method of the multistory concrete structure constituted using half precast beam members and half precast slab members comprises constructing columns 1 and beams 2 of a skeleton structure of each story while carrying out heating curing or adiabatic curing and carrying out post-cast concrete placement of slabs 3 of a center core section and heating curing or adiabatic curing of fresh concrete of the slabs 3 during a period of weather conditions in need of heating curing or adiabatic curing for fresh concrete, and constructing the remaining parts of the skeleton structure during a period of weather conditions not in need of heating curing or adiabatic curing for fresh concrete. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

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

  In the construction of a concrete structure in winter in a cold region, the entire work range is generally covered with a sheet or the like, and the concrete is cured while being warmed or insulated as a whole.

  For example, in Patent Document 1, a column, a beam, a slab, etc. on the upper level of the work floor are attached in advance, and the outer periphery of the work floor is covered with a sheet or the like by using this leading housing as a roof, and the entire floor is covered. A construction method for curing cast-in-place concrete in a warmed state is disclosed.

JP-A-4-49374

  However, since the conventional construction method heats and cures the entire work floor, when constructing a large-scale structure, it takes time for temporary work such as seat installation work, and it can be used for a wide range of warming. Expenses may have increased.

  The present invention has been made to solve the above-mentioned problems, and it is possible to easily and inexpensively perform the construction of concrete structures under climatic conditions that require heating curing or heat insulation curing. It is an object to propose a method for constructing a concrete structure.

  In order to solve the above-mentioned problems, the present invention is a method for constructing a multi-story concrete structure configured using a half-PCa beam member and a half-PCa slab member, During the period of climatic conditions that require adiabatic curing, the pillars and beams in the frame structure of each layer are constructed by heating curing or adiabatic curing, and post-cast concrete is placed on the half PCa slab member of the center core portion and It is characterized in that the remaining part of the frame structure is constructed during a period of climatic conditions in which the warming curing or thermal insulation curing for concrete is performed and the warming curing or thermal insulation curing for fresh concrete is not required. Fresh concrete here is synonymous with concrete not yet solidified in academic terms. Here, the center core portion is a frame structure constructed to ensure the rigidity and earthquake resistance of the building under construction among the frame structures, and refers to a space set at a substantially central portion in plan view of the concrete structure. .

  In the method for constructing a concrete structure, the column may be a precast column.

According to such a construction method of a concrete structure, it is possible to perform construction while ensuring structurally safe strength while continuing the frame construction.
In addition, it is possible to reduce the amount of concrete placed during the period when the warming curing or the heat insulation curing is necessary, to suppress the delay of the construction period, and to reduce the cost required for the heating curing or the heat insulation curing.

Here, the heating curing or the heat insulation curing of the columns and beams is performed on the concrete placed to form the columns or beams. For example, when the column is made of cast-in-place concrete, warming curing or heat insulation curing is performed on the entire column, and when the column is a precast column, the concrete placed partially such as a panel zone is subjected to heat curing. Here, the panel zone refers to a joint between a beam and a column.
Moreover, while performing the concrete placement of the junction part of beams, you may perform warming curing or heat insulation curing with respect to the said concrete. Thereby, it is possible to reduce the amount of concrete to be placed and also to narrow the range that requires heating curing or heat insulation curing, and therefore, it is excellent in workability and economy.

  According to the method for constructing a concrete structure of the present invention, it is possible to easily and inexpensively perform the construction of a concrete structure under a weather condition that requires warming curing or heat insulation curing without delaying the construction period. Become.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.

In this embodiment, as shown in FIG. 1, it is a construction method of a multi-story concrete structure B, and a concrete structure in which a building upper part B2 is constructed by a laminated construction method immediately above a building lower part B1 constructed by a reinforced concrete structure. A construction method of the object B will be described.
In this embodiment, the case where the winter period in which a warming curing or an adiabatic curing is required is included in the entire construction period is illustrated.

The lower building B1 is constructed by a conventional construction method. The construction of the lower building B1 is completed before the winter period.
When the construction of the building lower part B1 is completed, the building upper part B2 is constructed using the building lower part B1.

  The frame structure of the building upper part B <b> 2 includes a column 1, a beam 2, and a slab 3. The column 1 is composed of cast-in-place concrete, and the beam 2 and the slab 3 are composed of a half PCa member and each post-cast concrete. The balcony 4 is made of a full PCa member.

  The upper part B2 of the building has a column 1 and a beam 2 of the frame structure in the winter period (hereinafter, sometimes simply referred to as “severe winter curing period”) in which warm curing or thermal insulation curing is required for fresh concrete. The remaining part of the frame structure is constructed in a period in which the warming curing or thermal insulation curing for fresh concrete is not required (hereinafter sometimes simply referred to as “normal curing period”). Further, during the severe winter season curing period, post-cast concrete placement and warming curing or heat insulation curing that constitutes the slab 3 of the center core portion Bc (see FIG. 8A) is performed. “Building columns and beams” means that the joints are also completed. In the present embodiment, the work floor (upper floor) immediately above the work floor n is referred to as “upper floor n + 1”, and the work floor (lower floor) immediately below the work floor n is referred to as “lower floor”. This will be referred to as “floor n−1”.

The construction of the building upper part B2 during the severe winter curing period (construction method of the concrete structure) includes a pillar construction process for constructing the pillar 1 of the work floor n, and a half PCa beam member that becomes a part of the beam 2 of the upper floor n + 1. (Hereinafter, simply referred to as “beam member 21”) and a slab member for laying a half PCa slab member (hereinafter simply referred to as “slab member 31”) that will be a part of the slab 3 on the upper floor n + 1. An arrangement step, a balcony arrangement step for installing the balcony 4 on the upper floor n + 1, and a concrete placing step for post-casting concrete on the beam member 21 and the slab member 31 are provided.
The slab member 31 on the work floor n is laid in the slab member placement process of the previous construction cycle, and in this construction cycle, the column construction process, the beam placement process, and the concrete placing process are performed. Also used as a scaffold.

  The column construction process includes the reinforcement of the main reinforcement of the pillar 1 (hereinafter simply referred to as “column reinforcement”) 11 (FIG. 2A), the installation of the mold 13 (FIG. 3A), and the placement of concrete (FIG. 3 (b)) and a process for constructing the pillar 1 by curing the placed concrete (FIG. 3 (c)). Note that the hoop line of the pillar 1 is not shown.

  As shown in FIG. 2 (a), the column reinforcement 11 has a column reinforcement 11 'protruding from the upper end of the column 1 of the lower floor n-1, and the column reinforcement 11 of the column 1 of the work floor n. This is done by connecting. In the present embodiment, the columnar bars 11 and 11 ′ are connected to each other using a mechanical joint (coupler or the like) 12. In addition, the joint system of the column reinforcement 11 is not limited, For example, what is necessary is just to select from a well-known system suitably, such as a lap joint.

  About the joint part using the mechanical joint 12, as shown in FIG.2 (b), the grout injected into the inside of the mechanical joint 12 is cured (a warming curing) in a state where a constant temperature is maintained.

  In the heating and curing of the joint portion, the lid member 61 made of a heat insulating material is disposed above the mechanical joints 12, 12,..., The joint portion is covered with the curing sheet 62, and the heating means 60 is provided inside the sheet member 62. It is done by arranging. In addition, the method for warming and curing the joint portion is not limited and may be appropriately performed by a known method. In addition, the code | symbol 63 in FIG.2 (b) is a fixing member for fixing the sheet | seat member 62 to the pillar 11.

When the arrangement of the column reinforcement 11 is completed, the formwork 13 of the column 1 is installed so as to surround the periphery of the column reinforcement 11 as shown in FIG.
When the installation of the mold 13 is completed, concrete is placed inside the mold 13 as shown in FIG.

As shown in FIG. 3C, the fresh concrete is cured in a state where the column reinforcement 11 protruding from the upper end of the column 1 and the upper part of the column 1 are covered with a heat insulating sheet 64 (insulating curing).
Covering with the heat insulating sheet 64 prevents the reinforcing bars and the concrete placing surface from directly radiating heat so as not to touch the outside air.

  The beam arrangement process is a process of horizontally laying the beam 2 on the upper floor n + 1 by using the pillar 1 formed in the pillar construction process. As shown in FIG. 4A, the beam 2 is installed by placing both ends of the beam member 21 on the column 1 or the temporary mount 7.

  As shown in FIG. 4B, the beam 2 includes a beam member 21 and a post-cast concrete body 22 formed on the upper surface of the beam member 21.

  The beam member 21 has a concave portion 21a formed on the upper surface, and has a concave cross section. Also, a plurality of (four in this embodiment) main bars (hereinafter simply referred to as “beam bars”) 23, 23,... The shape and the like of the beam member 21 are not limited.

  The beam bar 23 protrudes from the end face of the beam member 21 along the axial direction, and is joined to the beam bar 23 protruding from the other beam member 21 adjacent in the axial direction. In addition, what is necessary is just to perform the joining method of the beam reinforcement 23 by a well-known method suitably, but in this embodiment, it carries out by welding joining. In order to prevent a rapid temperature drop at the welding location, it is desirable to cover the periphery of the welding location with a heat insulating material (not shown).

  The beam members 21 are joined to each other by placing concrete in the joint portion 24 in a concrete placing process described later (see FIG. 9A).

As shown in FIG. 4B, the post-cast concrete body 22 constituting the beam 2 is made of concrete placed on the upper surface of the beam member 21, and a plurality of pieces (this embodiment) arranged above the beam member 21 (this embodiment). In this embodiment, four beam bars 23, 23,...
It should be noted that the work of placing the concrete that will be the post-cast concrete body 22 of the beam 2 is performed in the concrete placing process of the next construction cycle except for the panel zone that has been constructed in advance. It is performed simultaneously with the work of placing the concrete that will be the post-cast concrete body 32 to be constructed.

  As shown in FIG. 5, the slab member arranging step is a step in which the slab member 31 of the slab 3 of the upper layer n + 1 is horizontally mounted on the beam member 21 of the upper layer n + 1 arranged in the beam arranging step.

  The slab 3 includes a so-called slab member 31 made of an omni plate, a Kaiser plate, or the like, and a post-cast concrete body 32 (see FIG. 8B) formed on the upper surface of the slab member 31. In the slab member arranging step, only the slab member 31 is laid. The slab member 31 is laid not only on the center core portion Bc but also on the entire upper floor n + 1.

As shown in FIG. 6, the balcony installation process is a process of installing the balcony 4 of the upper floor n + 1 made of a full PCa member via the beam member 21 (beam 2) facing outward.
The installation work of the balcony 4 is performed using a lifting machine C (see FIG. 1) such as a crane.

  The concrete placing process includes a placing process performed on the upper floor n + 1 and a placing process performed on the work floor n.

  In the placing step in the upper floor n + 1, as shown in FIG. 7, concrete is placed in the beam portion in the panel zone 5 of the upper floor n + 1 and the joint portion 24 between the beam members 21.

  Curing of the concrete (post-cast concrete) placed in the joint portion 24 between the beam members 21 is performed by covering the upper surface of the joint portion 24 with a box member 62 and curing the lower portion as shown in FIG. 9A, for example. In the state covered with 61, warming curing is performed.

  Further, the concrete (post-cast concrete) placed in the beam portion in the panel zone 5 includes the column reinforcements 11, 11,... Of the column 1 projecting upward as shown in FIG. The entire post-cast concrete of the part is covered with a heat insulating sheet (curing sheet 61), and is heated and cured in a state where briquette or the like is put as the heating means 60.

When the placing process on the upper floor n + 1 is completed, the placing process on the work floor n is performed.
In the placing process at the work floor n, as shown in FIG. 8A, the concrete that becomes the post-cast concrete body 22 of the beam 2 and the work-up concrete body 32 of the slab 3 at the center core portion Bc is simultaneously performed. (I.e., post-cast concrete placement on the beam member 21 and post-cast concrete placement on the slab member 31 are performed simultaneously).

  Curing for post-cast concrete of the slab 3 located in the center core part Bc is performed in a state in which a curing sheet 61 is disposed so as to cover the periphery of the center core part Bc and heated using a heating means. In addition, the beam member 21 and the slab member 31 of the upper floor n + 1 are used as a roof, and the curing sheet 61 is fixed to the pillar 1 and the support material 71 as shown in FIG. 8B, for example.

  As described above, in the severe winter curing period, curing of concrete placed during the period is performed by heating or thermal curing.

  Subsequently, the upper floor n + 1 is used as a work floor, and the next construction cycle (column construction process, beam placement process, slab placement process, balcony placement process, concrete placing process) is performed to stack up to a predetermined level.

  When the normal curing period is reached, the concrete structure is completed by performing concrete placement and normal curing on the remaining portion of each level (the post-cast concrete portion of the slab 3 other than the center core portion Bc).

  As mentioned above, according to the construction method of the concrete structure of this embodiment, it is not necessary to perform the warming curing or the heat insulation curing on the entire concrete frame structure, but to perform the predetermined part or range, so that it is necessary for the heat curing curing or the heat insulation curing. Costs can be reduced.

In addition, the construction work will be continued, so there will be no delay in the overall construction period.
In addition, by using the half-PCa member on the upper floor as a curing shed in warming curing or thermal insulation curing, it is possible to omit temporary work for curing, and to reduce the labor and cost of construction. Is possible.

The preferred embodiments according to the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the spirit of the present invention.
For example, in the said embodiment, although it shall construct | assemble by site construction as a pillar, a pillar may be constructed | assembled by a precast member and the structure of a pillar is not limited. In this case, the concrete placement during the severe winter curing period is only the joint portion between the beams, the slab post-cast concrete of the center core portion, and the panel zone, so that the workability can be further improved and the work period can be shortened.

In addition, the scale of the concrete structure is not limited.
Moreover, although the said embodiment demonstrated the case of the winter season which requires a warming curing or an adiabatic curing as a severe winter period curing period, the period of a severe winter period curing period is not limited.

  Moreover, the selection of the warming curing or the heat insulation curing for the concrete placed during the severe winter curing period may be made as appropriate depending on the climatic conditions, the construction location, etc., and is not limited to the above selection. Furthermore, the method of warming curing or heat insulation curing is not limited, and may be performed as appropriate.

It is an elevational view showing a concrete structure according to a preferred embodiment of the present invention. (A) is a perspective view which shows the main bar reinforcement situation of the pillar which concerns on the construction method of the concrete structure of FIG. 1, (b) is an elevation view which shows the curing condition of the main reinforcement junction part. It is a perspective view which shows the construction condition of the pillar of the concrete structure of FIG. 1, Comprising: (a) at the time of mold installation, (b) at the time of concrete placement, (c) has shown the time of curing. (A) is a perspective view which shows the installation condition of the beam member of the concrete structure of FIG. 1, (b) is sectional drawing of a beam member. It is a perspective view which shows the installation condition of the floor slab member of the concrete structure of FIG. It is a perspective view which shows the installation condition of the balcony of the concrete structure of FIG. It is a perspective view which shows the concrete placement condition of the concrete structure of FIG. (A) is a top view of the concrete structure of FIG. 1, (b) is a longitudinal cross-sectional view which shows the curing condition of a center core part. (A) is sectional drawing which shows the curing condition of a beam junction part, (b) is sectional drawing which shows the curing condition of post-cast concrete in a panel zone.

Explanation of symbols

1 Column 2 Beam 21 Beam member (Half PCa beam member)
22 Post-cast concrete body 3 Slab 31 Slab member (half PCa slab member)
32 Post-cast concrete body 4 Balcony

Claims (2)

A method for constructing a multi-story concrete structure constructed using a half PCa beam member and a half PCa slab member,
In the period of climatic conditions that require warming or thermal insulation for fresh concrete, the pillars and beams in the frame structure of each layer are constructed by thermal curing or thermal curing, and to the half PCa slab member of the center core part. Perform post-casting concrete placement and heating curing or thermal insulation curing for the concrete,
A method for constructing a concrete structure, comprising constructing the remaining portion of the frame structure during a period of climatic conditions that does not require warming curing or thermal insulation curing for fresh concrete.   The said pillar is a precast pillar, The construction method of the concrete structure of Claim 1 characterized by the above-mentioned.

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