JP2006226106A - Construction method for concrete structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for a concrete structure for shortening a period of construction by using the minimum number of forms and timbering. <P>SOLUTION: A form 27 is supported by a general timbering 46 and a specific timbering 47, and concrete is poured into the form 27. The general timbering 46 is removed while concrete is in an incomplete curing condition before it reaches designed strength to support the form 27 by the specific timbering 47, which is removed after the concrete reaches the deigned strength. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for constructing a concrete structure such as an apartment.

  In a building such as a condominium or a building, a concrete structure 100 serving as a structural basis of the building is used. A concrete structure 100 is shown in FIGS. 1, 9, and 10, and is provided with a column 11, a wall portion 12, a beam portion 13, a slab 10, and the like. The floor portion 9 is formed by the beam portion 13 and the slab 10.

As a conventional construction method for the concrete structure 100, there is a construction method in which each floor is formed as one unit, and the concrete is formed in order from the lower side while solidifying the concrete.
Specifically, the formwork is installed so that the space has a predetermined concrete shape, and then the concrete is poured into the formwork, and the concrete is cured to remove the formwork.

  The concrete gradually increases in strength after pouring. Therefore, it is cured until a predetermined time elapses, and until the design strength is obtained, the load of the mold is supported by the support structure which is a temporary structure, and cracks and breakage are prevented by its own weight. In particular, since the slab 10 and the beam portion 13 are located on a horizontal plane, the slab 10 and the beam portion 13 are required strength, and a sufficient curing period is required. And after the time which becomes design strength passes after curing, the formwork and the support work are removed.

Further, reinforcing bars and steel frames are used for the pillars 11, the wall parts 12, the beam parts 13, and the slabs 10 as necessary, and when concrete is formed, they become reinforced concrete (RC) or steel-framed reinforced concrete (SRC). Specifically, before installing the formwork, install rebars and steel frames and pour concrete into concrete. There exists a thing as described in patent document 1 as a prior art of the construction method of such a concrete structure.
Japanese Examined Patent Publication No. 3-54757

The above-described curing period from pouring and pouring the concrete to removing the formwork and the supporting work is long, and usually about 4 weeks are required. In the meantime, the formwork and support work remain. Without leaving the formwork and support work, equipment piping work and finishing work cannot be done, for example, concrete wall surface treatment, sash installation, duct installation, electric wiring, installation and installation of unit buses, partition walls, etc. I couldn't make any work.
Therefore, since the start of the finishing work is delayed, the construction period of the concrete structure 100 becomes long.

  If the time from placing the top floor concrete to the start of the finishing process can be shortened, the shortened period can be shortened as it is.

  In particular, in the case of high-rise apartments, in order to shorten the construction period, the concrete on the upper floor is placed during the concrete curing period on the lower floor. Therefore, the formwork and supporting work on the lower floor cannot be diverted, and the formwork and supporting work need to be set for a plurality of floors, and a large amount of materials are required.

  Therefore, an object of the present invention is to provide a concrete structure construction method capable of shortening the construction period by using a minimum formwork and support work.

  And the invention according to claim 1 for achieving the above-mentioned object is that the concrete structure having a plurality of substantially horizontal floor portions above and below is placed on the lower side of the formwork by installing the formwork. In the method of constructing a concrete structure in which concrete is supported by pouring concrete into the formwork, the support work is a general support work and a specific support work, and before the concrete is poured into the formwork, the general support work is performed. It is characterized by removing the general support work in the incomplete curing state before the concrete reaches the design strength and supporting the floor by the specific support work, and removing the specific support work after the concrete reaches the design strength. It is the construction method of the concrete structure to do.

  According to the first aspect of the present invention, the general support work and the specific support work are used to support the formwork, and the general support work can be removed in an incomplete curing state before the concrete reaches the design strength. Since the general support work can be removed, the next process can be performed at an early stage, and the general support work can be diverted when the upper concrete structure is formed. Furthermore, even if the general support is removed in the incomplete curing state, the floor is supported by the specific support, so that the concrete can be prevented from being damaged.

  The invention according to claim 2 is a method for constructing a concrete structure according to claim 1, characterized in that, before removing the general support, a support force adjustment operation for increasing the support force of the specific support is performed. is there.

According to the second aspect of the present invention, since the support force adjustment work for increasing the support force of the specific support work is performed, the general support work is removed in a state in which the support by the specific support work is reliable. It is possible to prevent the concrete structure from being damaged when removing.
The support force adjustment work may be performed after the specific support work is installed and before the general support work is removed. Moreover, when carrying out the supporting force adjustment work, the concrete needs to have a certain strength. Therefore, it is desirable that a period of about one day is passed after the concrete is placed. Furthermore, the day before the removal work of the general support work is desirable because of the setup of the work of removing the general support work.
In addition, the specific support work may be installed before or after the concrete placement, and the specific support work may be installed at the same time as the general support work before the concrete placement.

  The invention according to claim 3 is the construction method of the concrete structure according to claim 2, wherein the support force of the specific support work after the support force adjustment work is 1.96 kN or more.

  According to the invention described in claim 3, since the support force of the specific support after the support force adjustment work is 1.96 kN or more, when the general support is removed and supported only by the specific support, the support is surely supported. be able to. Furthermore, it is desirable that the support force of the specific support work after the support force adjustment operation is 5.88 kN or more.

  In the invention according to claim 4, a plurality of formwork holding materials are arranged on the entire surface under the formwork used on the underside of the floor portion, and the formwork support material is supported by a general support work, The method for constructing a concrete structure according to any one of claims 1 to 3, wherein the supporting work supports the formwork through a formwork holding material.

  According to the fourth aspect of the present invention, a plurality of formwork holding materials are arranged on the entire surface under the formwork used on the underside of the floor portion, and the formwork support material is supported by a general support work. In addition, since the general support supports the formwork through the formwork holding material, it is easy to install a wide range of formwork, and by removing the general support work, The formwork holding material such as large draw can be removed.

  The invention described in claim 5 is the concrete structure construction method according to claim 4, wherein the specific support is in direct contact with the formwork.

  According to the invention described in claim 5, since the specific support is in direct contact with the formwork, all the formwork holding materials can be removed by removing the general support work.

  In the invention described in claim 6, the formwork used below the floor portion is a fixed formwork having a predetermined shape, and a deformed formwork having a shape different from that of the formwork form. Is a method for constructing a concrete structure according to any one of claims 1 to 5, wherein a deformed formwork is supported.

  According to the invention described in claim 6, since the formwork directly supported by the specific support work is a deformed formwork, many fixed formwork with high utility value can be used. That is, in a state where the general support is removed in an incomplete curing state, the formwork supported by the specific support cannot be removed. However, such a formwork is a deformed formwork, and when a formwork is diverted, many fixed formwork can be used.

  As for invention of Claim 7, the said specific support work is arrange | positioned in several places, and the arrangement | positioning of the said specific support work is a linear arrangement | sequence, or has a plurality of linear arrangement | sequences, and The linear construction method according to any one of claims 1 to 6, wherein all of the linear arrays are substantially parallel.

  According to invention of Claim 7, the said specific support work is arrange | positioned in several places, and the arrangement | positioning of the said specific support work is a linear arrangement | sequence, or has two or more linear arrangement | sequences. Since all of the linear arrangements are substantially parallel, it is possible to support in a well-balanced manner while reducing the number of places where the specific support works are installed.

  The invention according to claim 8 is characterized in that the shape of the floor portion is substantially rectangular, and the linear arrangement of the specific support works is substantially parallel to the long side of the rectangle. It is the construction method of the concrete structure of description.

  According to the eighth aspect of the invention, since the linear arrangement of the specific support works is arranged so as to be substantially parallel to the long side of the rectangle, it is often used as the shape of the floor portion of the concrete structure. In the case of the generally rectangular shape adopted, it is possible to support with a good balance.

  The invention according to claim 9 is characterized in that the specific support works are arranged at a plurality of places, and the distance from other adjacent specific support works is 2 m or more and 5 m or less. It is a construction method of the concrete structure in any one of 1-8.

  According to invention of Claim 9, since it is 2 m or more and 5 m or less with an adjacent other specific support work, it supports efficiently, reducing the number of places where a specific support work is installed. Can do.

  The invention according to claim 10 is the concrete according to any one of claims 1 to 9, wherein the concrete structure is provided with a beam, and the beam is supported by the specific support work. It is a construction method of a structure.

  According to the invention described in claim 10, since the concrete structure is provided with the beam, and the beam is supported by the specific support, it is efficiently supported by the beam supported by the specific support. Can do.

  The invention according to claim 11 is the concrete structure construction method according to any one of claims 1 to 10, wherein the specific support work has a larger load that can be supported than the general support work. is there.

  According to the eleventh aspect of the invention, since the specific support work has a larger load that can be supported than the general support work, it can be supported by a small number of specific support works.

  The compressive strength of the concrete when removing the general support is desirably 13 N or more per unit square mm (claim 12).

  The formwork may be used as a part of the concrete structure (claim 13).

  According to the method for constructing a concrete structure of the present invention, the construction period can be shortened by using a minimum formwork and support work.

  Hereinafter, specific examples of the present invention will be described. Drawing 1 is a side view in the AA side which looked at the concrete structure constructed by the construction method of the present invention from the inside. FIG. 2: is the side view in the BB surface seen from the inside of the state which installed the formwork with the construction method of this invention. FIG. 3 is a perspective view showing a state in which a formwork is installed in the construction method of the present invention. FIG. 4 is a perspective view showing a lower side of a slab of a concrete structure to be constructed by the construction method of the present invention. FIG. 5 is a perspective view of a support used in the construction method of the present invention. FIG. 6: is the front view seen from the upper side of the state which installed the formwork with the construction method of this invention. FIG. 7: is the front view seen from the lower side in the state which installed the formwork with the construction method of this invention. It is a top view of the state which installed the formwork with the construction method of this invention. FIG. 8 is a schematic view showing a usage situation of a support work in the construction method of the present invention.

  The concrete structure constructed by the concrete structure construction method of the first embodiment of the present invention is the same as the concrete structure 100 shown in FIGS. 9 and 10 constructed by the conventional technique. The concrete structure 1 is a structure that is first formed when a building such as an apartment is constructed, and serves as a skeleton.

The concrete structure 1 is provided with a slab 10, a column 11, a wall portion 12, and a beam portion 13, and a floor portion 9 is formed by the slab 10 and the beam portion 13. Moreover, the slab 10, the column 11, the wall part 12, and the beam part 13 are provided with a reinforcing bar inside, and become a reinforced concrete structure.
In addition, although the concrete structure 1 is normally provided with the opening used as a window and a door, illustration and description are abbreviate | omitted in this specification.

As shown in FIG. 1, the slab 10 is a plate-like portion arranged in the horizontal direction. And the slab 10 (floor part 9) is provided with two or more by the concrete structure 1 up and down. The upper slab 10 is supported by a column 11, a wall portion 12, and a beam 13 provided on the upper side of the lower slab 10.
Moreover, FIG. 4 is the figure which looked at the concrete structure 1 from the state in the state which removed the slab 10 part.

The beam portion 13 is provided on the lower side of the slab 10. Then, the slab 10 is prevented from being bent by its own weight and the force received from the upper portion of the slab 10. The beam portion 13 is provided in the concrete structure 1 as necessary, and may be a floor portion 9 made of only the slab 10.
The column 11 has a long shape extending vertically and is positioned between adjacent upper and lower slabs 10. The wall portion 12 has a plate shape and is arranged in the vertical direction. The concrete structure 1 constructed by the construction method of the present embodiment is provided with a column 11 and a wall portion 12 to support the gravity of the upper portion thereof, but only the column 11 may be used. Only 12 may be used.

  An internal space 16 is provided between the slabs 10, and a facility for a residence or the like is installed in the internal space 16. The concrete structure 1 is provided with a plurality of internal spaces 16 in the vertical direction.

Next, the construction method of the concrete structure 1 is demonstrated.
When the construction method of the concrete structure 1 of this embodiment is outlined, the upper floor portion 9 is formed after the lower floor portion 9 is formed. In addition, the mold 27 is installed, the support 45 is placed below the mold 27 to support the mold 27, concrete is poured into the mold 27, and the support 45 is removed. Is called. Furthermore, the general support work 46 and the specific support work 47 are used as the support work 45, and the general support work 46 is installed before pouring concrete into the mold 27, and in an incomplete curing state before the concrete reaches the design strength. The general support 46 is removed and the floor 9 is supported by the specific support 47, and the specific support 47 is removed after the concrete reaches the design strength.

  First, a base portion (not shown) is formed. The foundation is provided in a portion below the ground, and supports the concrete structure 1 itself so that it does not tilt or fall. Specifically, a concrete pile or the like is buried in the ground, and the pile is further solidified with concrete. And the 1st floor part 21 is formed in the upper surface of a foundation part. The base part and the first floor part 21 are formed in the same manner as in the prior art.

2 and 3, the first floor portion column 11 and the wall portion 12 are located above the first floor portion 21 and the first floor portion pillar 11 and the wall portion 12 are located above the first floor portion 21 and the wall portion 12. The formwork 27 of the floor slab 10 is installed.
The mold 27 is the same as that of the prior art, and the space 39 inside the mold 27 is installed according to the shape of the concrete structure 1. The upper side of the space 39 is open.

  The formwork 27 includes a slab formwork 30, a pillar formwork 31, a wall formwork 32, and a beam formwork 33. And the formwork 27 is a wooden plate shape, and the thing of a suitable magnitude | size is used according to the shape and magnitude | size of the concrete structure 1. FIG. Specifically, the formwork 27 is a rectangular veneer that is reinforced as necessary. Note that illustration of such a reinforcing material is omitted.

  Prior to installation of the formwork 27, reinforcing bars are arranged in the space 39 in advance, and the slab 10, the pillar 11, the wall part 12, and the beam part 13 are made of reinforced concrete. If necessary, a steel frame may be arranged in the space 39 to form a steel frame reinforced concrete structure.

  The mold 27 is appropriately fixed by a fixing method such as a nail as in the prior art. Further, the slab mold 30 and the beam mold 33 are installed after the mold holding member 44 is installed, as will be described later.

The slab mold 30 is supported by a support 45 as shown in FIG. The support work 45 is the same as that conventionally used, and as shown in FIG. 5, the support work 45 is a cylindrical member having a flange portion 45b at the top and bottom and having a variable length. The support 45 is selected and used with an appropriate length and thickness according to the structure of the concrete structure 1 and the like.
Then, by rotating the screw part 45 a provided in the intermediate part, the support work 45 can be further lengthened while being supported by the support work 45 while supporting the mold 27 and the like. In the state, the axial force can be adjusted by applying the axial force. This axial force becomes a support force, and the support force can be adjusted as will be described later.

  The slab formwork 30 and the beam formwork 33 are installed on a formwork holding member 44. As the formwork holding material 44, a wooden or metal prismatic material is used. The formwork holding member 44 is arranged in two upper and lower stages, and is provided with a joist 44a that is an upper formwork holding member and a large pull 44b that is located below the joist 44a.

The present embodiment is characterized by the arrangement of the slab mold 30, the support 45, and the joists 44a and the large forks 44b that are the mold retainers 44, and will be described with reference to FIGS. To do.
As shown in FIG. 7, a joist 44a and a large pull 44b are arranged. The upper and lower positional relationships are such that the large pull 44b is disposed above the support 45, the joist 44a is disposed above the large pull 44b, and the slab mold 30 is provided above the joist 44a. Yes.

The slab formwork 30 is laid horizontally in the lower position of the slab 10. The slab mold 30 has a plurality of regular molds 35 which are regular plates, and a deformed mold 36 having a different shape from the regular mold 35.
As shown in FIG. 6, the fixed form 35 of the slab form 30 is laid and installed from both ends of the slab 10. Then, the deformed mold 36 is laid in a gap formed in the middle of the slab 10 and having a width smaller than that of the fixed mold 35. Therefore, the deformed form 36 is located in the middle of the slab 10 and is smaller than the fixed form 35. The layout of the deformed form 36 is matched to the position of the specific support 47 as will be described later.

  A plurality of joists 44 a are provided, and are arranged on the entire surface of the slab 10 at a substantially shorter interval than the width of the slab mold 30. The joist 44a supports the slab mold 30 provided on the entire surface of the slab 10. As shown in FIG. 7, the large pull 44 b is arranged below the joist 44 a so as to be perpendicular to the longitudinal direction of the joist 44 a. A plurality of large pulls 44b are provided in the same manner as the joists 44a, and are arranged on the entire surface of the slab 10 to support the joists 44a.

The support work 45 includes a general support work 46 and a specific support work 47. The specific support 47 is thicker than the general support 46 and can support a larger load.
Further, as shown in FIG. 2, the general support 46 is provided between the lower side of the formwork holding material 44 and the first floor 21, and supports the formwork holding material 44 and indirectly for the slab. The mold 30 is supported. The specific support 47 is provided between the deformed mold 36 of the slab mold 30 and the first floor 21 and directly supports the deformed mold 36a.
At the time of support by the specific support 47, a wooden square or a wooden flat plate called a flute corner may be sandwiched between the formwork 27 and the like at the end of the flange 45b. One relay material may be sandwiched between a plurality of specific support works 47.

As with the prior art, the general supporters 46 are arranged so as to support the large pull 44b, and can support the weight of the concrete in the slab 10 after placing the concrete.
In addition, the arrangement of the specific support work 47 is determined by the examination result. That is, the period until the general support 46 is removed in the incomplete curing state is calculated by the mechanical calculation of the structure of the concrete structure 1 at the design stage, the relationship between the curing time and the concrete strength, and the specific support 47 Consider the arrangement to support the floor part.
The curing time until the general support 46 is removed is the structural calculation of the floor 9 such as the slab 10 and the concrete strength obtained by the curing is the predetermined strength of the concrete in a state where the floor 9 is supported by the specific support 47 Set to exceed.

  In addition, the specific support 47 is desirably arranged so as not to interfere with the finishing process, and the stress state of the concrete in a state where the floor 9 is supported by the specific support 47 differs depending on the location of the floor 9. It is desirable to arrange the specific support 47 so as to reduce the size. Moreover, when the beam part 13 is provided, it is desirable to arrange | position the specific support work 47 so that the beam part 13 may be supported.

The arrangement of the specific support work 47 of this embodiment is shown in FIG.
When the floor 9 is supported by the specific support 47, it may be performed by one specific support 47 at one place, or a plurality of specific support 47 may be used at one place. In this embodiment, two specific support works 47 are used at one place.

  The specific support works 47 are arranged at a plurality of places, and in this embodiment, two of each are provided at three places. And the arrangement | positioning of the specific support 47 is a linear arrangement | sequence. In the description of the arrangement of the specific support works 47, when a plurality of specific support works 47 are used in one place, the description will be made as one place.

  The shape of the floor portion 9 of the present embodiment is substantially rectangular, the direction of the arrangement of the specific support 47 described above is parallel to the long side of the floor portion 9, and the position thereof is the center of the floor portion 9. Is located.

In addition, as for the specific support 47, it is desirable that the space | interval with the other adjacent specific support 47 is 2 m or more and 5 m or less. By setting such an interval, it can be efficiently supported by a small number of specific support works 47. Furthermore, in any place on the floor 9, the specific support 47 is arranged so that the shortest distance to any of the specific support 47, the pillar 11 and the wall 12 is 1 m or more and 2.5 m or less. It is desirable to do.
Further, when the width of the short side of the floor portion 9 is 10 m or more, the specific support 47 is arranged in a plurality of linear arrangements, and all of these arrangements are substantially parallel. can do.

  And the specific support 47 is arrange | positioned according to this examination result. The arrangement of the general support works 46 and the specific support works 47 is shown in FIG.

  Further, as shown in FIG. 7, the specific support 47 supports the deformed form 36a directly without using the joists 44a and the large pull 44b. The deformed mold 36 a supported by the specific support 47 is smaller than other deformed molds 36. The width of the deformed mold 36a is set so that the deformed mold 36a is disposed on the joist 44a and the deformed mold 36a is positioned between the two joists 44a in accordance with the width of the installation interval of the joists 44a. It may be. In such a case, the deformed form 36a can be made smaller.

  In addition, since the specific support 47 used in this embodiment is thicker than the general support 46 and can support a large load, it can be supported by a smaller number of specific supports 47.

  The beam form 33 is also installed in the same manner as the slab form 30. In other words, the beam formwork 33 is supported by the general support 46 through the joists 44a and the large pulls 44b. Further, the specific support 47 is used, and the beam formwork 33 is directly supported without using the joist 44a and the large pull 44b, and the beam formwork 33 supported by the specific support 47 is used as the deformed formwork 36a. .

  As described above, after the mold 27, the mold retainer 44 and the support 45 are installed, concrete is poured from the upper side of the space 39. The concrete gradually fills from the lower side of the space 39 and fills up to the upper side of the slab 10 on the second floor. Known materials are used for the concrete.

  When forming this slab 10, you may make it provide the through-hole for material conveyance called a dead hole. This drain hole is provided so as to penetrate the upper floor and the lower floor, and the formwork 27, the formwork holding material 44, the support work 45, etc. used on the lower floor can be carried up to the upper floor by handing or the like. it can. And, when the upper floor is constructed, the dead hole is closed with concrete.

  Furthermore, it is cured as it is. As it is cured, the concrete strength gradually increases.

Then, the supporting force adjustment work is performed. This supporting force adjustment work requires a certain level of concrete strength, and is performed after one or more days have passed since the concrete placement, that is, after the next day after the concrete placement.
Further, the supporting force adjustment work is performed before the general support 46 is removed. The timing of the supporting force adjustment work is desirable because the concrete strength is high immediately before the general support 46 is removed. Specifically, the time from the support force adjustment work to the removal of the general support 46 is within 24 hours. desirable. The support force adjustment work is performed by adjusting the screw portion 45a of the specific support 47 and increasing the support force by increasing the length of the specific support 47.

This support force adjustment operation is performed by adjusting the screw portion 45a so that the axial force (support force) of the specific support 47 becomes a predetermined axial force. Specifically, the screw portion 45a is manually rotated. Furthermore, the screw portion 45a is rotated by a predetermined rotation angle using a tool. By carrying out in this way, it is easy for anyone to understand and the operation is not mistaken, and a substantially uniform axial force can be easily obtained at the construction site.
Moreover, it is desirable to adjust the axial force (supporting force) of the specific support 47 after the adjustment by the supporting force adjusting operation to be 1.96 kN (200 kgf) or more. Furthermore, it is desirable to adjust so that it may become 5.88kN (600kgf) or more. By adjusting to such an axial force, when the general support 46 is removed and a large axial force is applied to the specific support 47, the axial force is increased with a smaller deformation and the deformation of the concrete is reduced. be able to.

  After the concrete placement, after a predetermined period of time, the general support work 46 is removed while leaving the specific support work 47 in an incompletely cured state. This period is a period previously obtained by calculation based on the above examination results, and the concrete strength is equal to or higher than a predetermined strength. Further, after confirming the strength by a concrete compression test using a test piece, the general support 46 is removed. This period is usually about 3 days after placing concrete.

  As for the predetermined strength of the concrete when the general support 46 is removed, that is, the concrete strength in the incomplete curing state, the compressive strength is desirably 13 N or more per unit square mm. By carrying out in such a state, breakage of concrete can be prevented.

At this time, since the joists 44a and the large pull 44b are supported by the general support 46, the general support 46 can be removed.
Furthermore, the formwork 27 is also removed. As for the slab mold 30, the deformed form 36a is supported by the specific support 47, and the deformed form 36a cannot be removed unless the specific support 47 is removed. The slab mold 27 can be removed by removing the joists 44a. Then, the slab mold 27 other than the deformed mold 36a is removed.

  In this way, when the formwork 27 other than the joists 44a, the large pull 44b, the general support work 46, and the deformed formwork 36a is removed, the floor portion 9 of the concrete structure 1 is supported by the specific support work 47. Further, the mold 27 is only the deformed mold 36a.

In the prior art, the mold 27 and the support 45 are removed after curing for about 4 weeks until the design strength is reached. However, in this embodiment, most of the mold 27 and general support in a short period of time after placing the concrete. The work 46 can be removed.
Further, the slab mold 30 supported by the specific support 47 cannot be removed until the specific support 47 is removed. However, the slab mold 30 is a deformed mold 36a, which will be described later. When the slab formwork 30 is used again on the upper floor, the fixed formwork 35 can be used as it is. The removal of the specific support 47 is performed after the floor portion 9 reaches the design strength. Furthermore, the deformed mold 36a is smaller than the fixed mold 35 and smaller than the other deformed molds 36. Therefore, as described later, the deformed mold 36a is not easily disturbed during the next process such as a finishing process.

Then, on the upper side of the second-story floor slab 10, the second-story column 11 and wall 12, and the third-story floor slab 10 located above the second-story column 11 and wall 12 are placed on the first floor. Similarly to the portion, concrete is cast using the formwork 27.
The general support 46, the formwork 27, and the formwork holding material 44 (the joists 44a and the large draw 44b) can be used on the first floor as they are and removed from the first floor. No temporary place is required.

At this time, when the slab 10 is provided with the above-mentioned dead hole, the general support 46, the formwork 27, and the formwork holding material 44 used on the lower floor are lifted to the upper floor, and the work on the upper floor is performed. Can be used immediately.
Accordingly, it is not necessary to unload the general support 46 using a crane or the like, and the unloading stage for the general support 46 provided on each floor, which is necessary in the prior art, is unnecessary.

  In the same way above the 3rd floor, concrete is cast and formed up to the top floor. And the concrete structure 1 is completed.

  FIG. 8 is a view showing a usage situation of the support work 45 when the concrete structure 1 is constructed. Until the concrete on the first floor is poured and the general support 46 is removed, the state shown in FIG. 8A is maintained, and the concrete structure 1 is supported by the general support 46 and the specific support 47. And after a predetermined period, the general support 46 and the formwork 27 are removed, and it assembles in the 2nd floor part. At this time, the specific support 47 on the first floor is used as it is, and another specific support 47 on the second floor is used. Then pour the concrete on the second floor. This state is the state of FIG.

Further, the concrete structures 1 of the third floor portion and the fourth floor portion are formed in the same manner, and the state shown in FIG. 8 (c) is changed to the state shown in FIG. 8 (d). The specific support 47 used for the fourth floor can be the specific support 47 used for the first floor.
Therefore, at the construction stage of the concrete structure 1, the specific support 47 is performed using three floors (three sets).

  When the specific support 47 is removed, it is removed after confirming that the concrete strength is the design strength as in the case of removing all the supports 45 in the conventional method. Therefore, the period during which the specific support 47 can be removed from the concrete placement according to the present embodiment is substantially the same as the period during which the support 45 can be removed from the concrete placement according to the conventional technique.

  According to the embodiment of the present invention, the general support 46 and the formwork 27 can be removed from the concrete placement in a short period of time, and the cycle period can be shortened, so that the next process such as the finishing process can be performed. For example, surface treatment of concrete walls, installation of sashes, installation of ducts, electrical wiring, delivery of unit baths, construction of partition walls, etc. can be started at an early stage, and construction can be carried out by shortening the time difference between frame construction and finishing work. The period can be shortened and the period of the finishing process can be secured.

  When the specific support 47 used in the first floor portion is used in the fourth floor portion, it is necessary to unload with a crane or the like, and a stage for unloading is required on each floor. Since the stage used for carrying in the material used in the finishing process can be used after carrying in the material used in the finishing process, the work can be performed without making a stage for the specific support 47.

The construction method of the concrete structure 1 described above has the following advantages.
First, the formwork 27 and the formwork holding material 44 that are not supported by the general support work 46 and the specific support work 47 can be removed in a short period of time from placing concrete. There is only one set. Therefore, by using the drain hole, it is not necessary to unload with a crane or the like, and the associated unloading stage is not necessary, so that work can be performed with less material.
Next, since the parts other than the specific support 47 and the formwork 27 supported by the specific support 47 can be removed at an early stage, the finishing process of the next process can be started quickly. Therefore, compared with the prior art method, it is possible to start and complete the finishing process on the top floor and the floors near the top floor, thereby shortening the entire construction period. Further, the early removal of the mold 27 is possible without using the early strong concrete that has been used for the early removal of the mold 27, and the cost can be reduced.
In addition, if a problem that requires repair or correction of the concrete part after removal of the formwork 27 occurs, the formwork can be removed early, so the problem can be discovered early, Delay can be minimized.

  The specific support 47 may not be installed at the same time as the general support 46, and may be installed before the general support 46 is removed.

Furthermore, in the above-described embodiment, the formwork 27 such as the slab formwork 30 is finally removed, but the state where the formwork 27 is attached to the concrete structure 1 as a so-called “disposal formwork”. The mold 27 can be used as a part of the concrete structure 1 without any process of removing the mold 27.
Specifically, concrete is cast using a reinforced concrete plate (RC plate) as a slab formwork 30 and the slab formwork 30 is left without being removed. The concrete structure 1 having reinforcing bars provided on the upper side can be used for a method of leaving the slab formwork 30 without removing it. These construction methods are called “slab industrialization methods”.

  Moreover, about the structure of the slab 10 of the concrete structure 1, the other structure conventionally used can be employ | adopted, and there exist a hollow void, an slenoid void, a spun cleat, an unbond etc. specifically ,.

The hollow void is a structure in which a pipe is arranged inside the slab 10 and concrete is placed, and a space is provided inside the slab 10. An eslenoid is formed by placing a resin foam at a predetermined interval on a PCa (precast concrete) plate and casting concrete. In addition, you may use what attached this resin foam to the PC board previously.
The spun cleat is a PC plate having a hollow hole. The PC board is a board in which concrete is hardened with a steel wire pulled to impart compressive stress to the concrete, and the strength when tensile stress is applied to the concrete can be increased.
Unbonding is a method of placing a steel wire arranged in a parabolic shape at the same time as reinforcing bar placement, placing and hardening the concrete, and tensioning the steel wire using a special jack. By doing so, prestress can be given to a concrete structure by the steel wire arranged in the shape of a parabola, and upward lifting force can be exhibited.

  INDUSTRIAL APPLICABILITY The present invention can be used for a concrete structure construction method capable of shortening a construction period by using a minimum formwork and support work.

It is the side view in the AA surface which looked at the concrete structure constructed by the construction method of the present invention from the inside. It is the side view in the BB surface seen from the inside of the state which installed the formwork with the construction method of this invention. It is a perspective view of the state which installed the formwork with the construction method of the present invention. It is the perspective view which showed the lower side of the slab of the concrete structure constructed | assembled with the construction method of this invention. It is a perspective view of the support construction used for the construction method of the present invention. It is the front view seen from the upper side of the state which installed the formwork with the construction method of this invention. It is the front view seen from the lower side of the state which installed the formwork with the construction method of this invention. It is the schematic diagram which showed the usage condition of the support work with the construction method of this invention. It is a perspective view of a concrete structure. It is the perspective view which showed the inside of a concrete structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete structure 9 Floor part 10 Slab 27 Formwork 30 Slab formwork 35 Fixed formwork 36, 36a Deformed formwork 44 Formwork holding material 45 Support work 46 General support work 47 Special support work

Claims (13)

  A concrete structure that has a plurality of substantially horizontal floors above and below a concrete structure that is installed by placing a formwork and placing a support under the formwork to support the formwork and pour concrete into the formwork In the construction method described above, the support work is a general support work and a specific support work. A method for constructing a concrete structure, wherein the support is removed, the floor is supported by the specific support, and the specific support is removed after the concrete reaches the design strength.   2. The method for constructing a concrete structure according to claim 1, wherein a supporting force adjusting operation for increasing a supporting force of the specific supporting work is performed before removing the general supporting work.   The method for constructing a concrete structure according to claim 2, wherein the support force of the specific support work after the support force adjustment work is 1.96 kN or more.   A plurality of formwork holding materials are arranged on the entire lower surface of the formwork used on the lower side of the floor, the formwork support material is supported by a general support work, and the general support work is performed via the formwork support material. The method for constructing a concrete structure according to any one of claims 1 to 3, wherein a mold is supported.   The concrete support construction method according to claim 4, wherein the specific support is in direct contact with the formwork.   The formwork used on the lower side of the floor part is a fixed formwork having a predetermined shape, and a deformed formwork having a shape different from that of the fixed formwork, and the specific supporter supports the deformed formwork. The construction method of the concrete structure in any one of Claims 1-5 characterized by these.   The specific support works are arranged at a plurality of locations, and the arrangement of the specific support works is a linear arrangement, or a plurality of linear arrangements are provided, and all of the linear arrangements are substantially parallel. The method for constructing a concrete structure according to any one of claims 1 to 6, wherein:   The construction method for a concrete structure according to claim 7, wherein the floor portion has a substantially rectangular shape, and the linear arrangement of the specific support works is substantially parallel to the long side of the rectangle.   The said specific support work is arrange | positioned at several places, and the space | interval with the adjacent other specific support work is 2 m or more and 5 m or less, The one in any one of Claims 1-8 characterized by the above-mentioned. Construction method for concrete structures.   The concrete structure construction method according to claim 1, wherein a beam is provided in the concrete structure, and the beam is supported by the specific support work.   The concrete support construction method according to any one of claims 1 to 10, wherein the specific support work has a larger load that can be supported than the general support work.   The method for constructing a concrete structure according to any one of claims 1 to 11, wherein the compressive strength of the concrete when removing the general support is 13 N or more per unit square mm.   The construction method for a concrete structure according to any one of claims 1 to 12, wherein the formwork is used as a part of the concrete structure.

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