JP3721505B2 - Construction method of top plate part of reinforced concrete structure - Google Patents

Construction method of top plate part of reinforced concrete structure Download PDF

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Publication number
JP3721505B2
JP3721505B2 JP2000245344A JP2000245344A JP3721505B2 JP 3721505 B2 JP3721505 B2 JP 3721505B2 JP 2000245344 A JP2000245344 A JP 2000245344A JP 2000245344 A JP2000245344 A JP 2000245344A JP 3721505 B2 JP3721505 B2 JP 3721505B2
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Japan
Prior art keywords
plate
support
construction
reinforced concrete
work
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Expired - Fee Related
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JP2000245344A
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Japanese (ja)
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JP2002061498A (en
Inventor
泰幸 佐藤
裕之 山内
和彦 越田
正 齋木
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清水建設株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a top plate portion of a reinforced concrete structure.
[0002]
[Prior art]
FIG. 5 shows a construction method of a top plate portion of a reinforced concrete tunnel used for forming an underpass, for example.
The tunnel 100 shown here has a roadway 101 in the center and sidewalks 102A and 102B formed on the left and right sides of the roadway 101, respectively. Concrete has already been placed up to the intermediate portions in the height direction of the floor slab portion 103 and the outer wall 104 and the inner wall 105 of the tunnel 100.
The construction method of the remaining upper portions of the inner and outer walls 104 and 105 and the top plate portion 106 will be described. First, a supporting structure 107 that also serves as a scaffold is assembled at locations that become the roadway 101 and the sidewalks 102A and 102B (FIG. 5A). ). After that, the embedding reinforcing bar 108 is disposed at a predetermined position which is the upper portion of the inner wall 105 (FIG. 5B).
[0003]
Next, the bottom mold 109, the inner mold 110, and the inner mold 111 of the top plate portion 106 are assembled, and the molds 109, 110, 111 are supported by the support 107 (FIG. 5). (C)). Next, the reinforcing bars 112 for embedding are respectively disposed at predetermined locations that are the upper portion of the outer wall 104 and at predetermined locations of the top plate portion 106 (FIG. 5D), and then the outer formwork 113 of the outer wall is assembled (FIG. 5 ( E)). Then, concrete is placed in the molds 109, 110, 111, and 113, whereby the top plate portion 106 and the like are formed.
[0004]
[Problems to be solved by the invention]
In the construction method of the top plate part of the conventional reinforced concrete structure described above, there are the following problems.
In other words, in a normal construction site where the upper and side of the structure are open, the above construction method can be used without any problem. For example, when constructing a tunnel or an underground mall under the railway, When trying to adopt the construction method that arranges the bars after assembling the above-mentioned conventional bottom formwork in a narrow area surrounded by sheet piles 114, etc. (see the one-dot chain line in FIG. 5 (d)) In the narrow space 115 surrounded by the frames 109, 110, 111 and the sheet pile 114, the work of transporting the main muscles composed of the upper and lower muscles embedded in the top plate portion 106 and the installation work of these main muscles must be performed. In other words, the workability is poor and the working time is prolonged.
In addition, the worker is forced to work in an unreasonable posture to bend his / her waist in the narrow space 115 surrounded by the above-mentioned molds 109, 110, and 111 and the sheet pile 114, and work in a normal environment. There is also a problem of feeling tired at an early stage compared to.
[0005]
The present invention has been made in view of the above circumstances, and the object of the present invention is to maintain good workability when performing bar arrangement even if the upper part is a narrow part surrounded by a sheet pile or the like. An object of the present invention is to provide a method for constructing a top plate portion of a reinforced concrete structure that can shorten the working time and does not force the worker to work for a long time in an unreasonable posture.
[0006]
[Means for Solving the Problems]
In the invention according to claim 1 of the present invention for solving the above-mentioned problem, in constructing the top plate portion of the reinforced concrete structure, a support for earth retaining that supports the upper ground in advance above the top plate portion is provided. And supporting and supporting the reinforcing bars embedded in the top plate portion by means of a suspension base extending downward from the support body, and then assembling the bottom mold frame and the side mold frame of the top plate portion respectively. It is supported by supporting work, and then concrete is placed in the molds to make the top plate part.
The invention according to claim 2 , after assembling the bottom mold of the top plate part, removing the suspension base extending downward from the support, adjusting the position of the reinforcing bar of the top plate part, The top plate part is made by placing concrete inside.
The invention according to claim 3 is characterized in that the support is a pipe roof formed by arranging a plurality of pipes in parallel.
[0007]
According to the present invention, in constructing the top plate portion of the concrete structure, the bar placement work is performed on the top plate portion first before assembling the formwork. Therefore, even if a sheet pile or the like is previously arranged above the structure, good workability can be ensured when arranging the bars.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a reinforced concrete structure according to the present invention in the middle of construction when making a tunnel for forming an underground passage under a track, and FIG. 2 is a front view of the construction in the middle of making the tunnel.
In these drawings, reference numeral 1 denotes a tunnel for forming an underpass under the railway line, and 2 denotes a pipe roof for earth retaining when the tunnel 1 is made. The pipe roof 2 is formed by press-fitting a large number of steel pipes 2a into the ground so as to have a gate shape when viewed from the front. The pipe roof 2 supports the ground to prevent the top end from collapsing. However, tunnel excavation inside becomes possible. In FIG. 2, reference numeral 3 denotes a receiving girder that receives the pipe roof 2, and 4... Are receiving piles that receive the pipe roof 2 through the receiving girder 3.
[0009]
The tunnel 1 is formed with a roadway 10 at the center and sidewalks 11A and 11B on the left and right sides of the roadway 10, respectively. In addition, here, the concrete has already been cast up to the intermediate portions in the height direction of the floor slab portion 12 and the outer wall 13 and the inner wall 14 of the tunnel 1.
[0010]
A method for constructing the remaining upper portions of the inner and outer walls 14 and 13 and the top plate portion 15 will be described with reference to FIGS.
First, a supporting work 17 that is also used as a scaffolding is assembled at locations that become the roadway 10 and the sidewalks 11A and 11B (FIG. 3 (A)). In this case, the support 17 is not made up to the position of the lower end surface 15a of the top plate part 15, but is made up to a predetermined height with a predetermined gap 18 between the lower end surface 15a.
[0011]
Next, the suspension base 19 is assembled through a stay 19a extending downward from the pipe roof 2 (FIG. 3 (B)). Thereafter, the upper bar 20 of the top plate portion 15 is arranged at a predetermined position, and the upper bar 21 is supported by the suspension base 19 (FIG. 3C).
Next, an embedding reinforcing bar 21 is arranged at a predetermined position which is an upper part of the outer wall 13 (FIG. 3D), and then the lower bar 22 of the top plate portion 15 is arranged at a predetermined position and is not shown. A width stop bar is stretched between the abdominal muscles, whereby the entire bar arrangement of the top plate portion 15 is temporarily fixed (FIG. 3 (e)).
[0012]
Next, an embedding reinforcing bar 23 is disposed at a predetermined position that is an upper portion of the inner wall 14 (FIG. 4F). Thereafter, a secondary support 17a is assembled on the upper side of the support 17 so as to fill the gap 18 between the first support 17 assembled and the lower end surface 15a of the top plate portion (FIG. 4G). ). Furthermore, the bottom mold 24 of the top plate part, the left and right molds 25 and 25 of the inner wall 14, and the inner mold 26 of the outer wall are assembled, and the molds 24, 25 and 26 are supported by the supporters 17 and 17a. (FIG. 4 (h)).
[0013]
Next, the suspension base 19 that has supported the bar arrangement of the top plate portion 15 is removed, and the relative positions with respect to the formwork 24 and the mutual interval between the reinforcing bars are included with respect to the free arrangement of bars. The final position adjustment is performed (Fig. 4 (R)).
[0014]
Thereafter, the outer mold 27 of the outer wall is assembled (FIG. 4 (N)).
Next, concrete is placed in the molds 24, 25, 26, and 27, and after curing for a predetermined period, the molds 24, 25, 26, and 27, the support work, and the like are removed.
By the above process, the upper portions of the inner and outer walls 14 and 13 and the top plate portion 15 where the tunnel is left are formed.
[0015]
According to the construction method of the top plate portion of the reinforced concrete structure described above, the bar placement work is performed on the top plate portion 15 before assembling the bottom mold 24 of the top plate portion 15 and the like. The muscle work can be performed using a wide space below the place where the bottom mold 24 is arranged. Therefore, as in this example, the pipe roof 2 is arranged in advance above the structure. Even when the work space cannot be taken above the bar arrangement location, it is possible to ensure good bar arrangement workability. For this reason, even when the work space cannot be taken upward, the construction period is significantly larger than the case of employing the construction method in which the formwork 24 of the top plate portion is assembled first and then the reinforcement work is performed. Shortening is possible.
[0016]
Further, the bar arrangement work for the top plate portion 15 can be performed using a wide space below the place where the bottom mold 24 is arranged. Specifically, the operator can perform the bar arrangement work in a standing posture performed by placing his / her foot on the intermediate position of the support work 17 which also serves as a scaffold. For this reason, the operation in an unreasonable posture performed by bending the waist described in the conventional example is limited only to the final bar arrangement adjustment shown in FIG. As a result, the physical burden on the operator is reduced at each stage as compared with the case where the conventional construction method is adopted.
[0017]
In addition, as described above, the bottom mold 24 of the top plate portion is a construction method for assembling after the bar arrangement work and finally placing the concrete. It is difficult for dirt such as scales to accumulate, and therefore, the work of cleaning the surface of the formwork before placing concrete, which has been conventionally performed, becomes unnecessary.
[0018]
The present invention is not limited to the above-described embodiment, and can be appropriately changed in design without departing from the spirit of the invention.
For example, in the above-described embodiment, the present invention has been described by taking as an example the case where the top plate portion of the tunnel under the track is constructed. However, of course, the present invention is not limited to this. Needless to say, the present invention can also be applied to the case where top plates of other reinforced concrete structures are made.
[0019]
【The invention's effect】
In the invention according to claim 1, before assembling the bottom mold or the like of the top plate portion, a support for holding earth is provided in advance above the top plate portion in advance, and downward from the support body. If the rebar of the top plate part is suspended and supported by the extending suspension base, the rebar support of the top plate part before assembling the form plate of the top plate part can be performed while leaving the work space below, Placement work and post-process formwork can be carried out while ensuring good workability, and when the work space is not available above the place of the bar arrangement, after the bottom formwork is assembled Compared to adopting the conventional construction method for performing work, the construction period can be greatly shortened. In addition, the work in an unreasonable posture performed by the operator bending the top plate part can be stopped at a very small part of the entire process, and therefore the physical burden on the worker is reduced to the conventional construction. Compared to the case where the method is adopted, each stage is reduced. Furthermore, since the bottom formwork etc. of the top plate part is assembled after the bar arrangement work and before the concrete is finally placed, there is trash such as reinforcing bars and scales on the surface of the bottom formwork. It is difficult to collect, and the work of cleaning the surface of the formwork before placing concrete, which is normally performed, becomes unnecessary.
In addition, after assembling the bottom formwork of the top plate part, removing the suspension base that extends downward from the front support, and adjusting the position of the rebar of the top plate part, the relative between the formwork and the bar arrangement Final position error can be corrected finally.
Furthermore, if the support is a pipe roof formed by arranging a plurality of pipes in parallel, the existing pipe roof can be used effectively, and the number of parts and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view of a reinforced concrete structure according to the present invention in the middle of construction when a tunnel for forming an underpass under a track is made.
FIG. 2 is a front view in the middle of construction when making the tunnel.
FIG. 3 is a side view for explaining a process of a construction method for a top plate portion and the like of the tunnel.
FIG. 4 is a side view for explaining the steps of the construction method for the top plate portion and the like of the tunnel.
FIG. 5 is a side view for explaining a process of a conventional method for constructing a top plate portion of a reinforced concrete structure.
[Explanation of symbols]
1 Tunnel 2 Pipe roof (support)
12 floor slab part 13 outer wall 14 inner wall 15 top plate part 17 support 19 suspension frame 19a stay 20 top plate part upper stripe 22 top plate part bottom stripe 24 top plate part bottom mold 25 inner wall side mold 26 Inner formwork 27 Outer formwork on the outer wall (top formwork side formwork)

Claims (3)

  1. In constructing the top plate of a reinforced concrete structure,
    Provide a support for earth retaining to support the upper ground in advance above the top plate part,
    Suspend and support the reinforcing bars embedded in the top plate portion by a suspension base extending downward from the support,
    Next, while assembling the bottom mold and side molds of the top plate part respectively, supporting these molds with a support work,
    Next, a method for constructing the top plate portion of a reinforced concrete structure, wherein concrete is cast into the molds to form a top plate portion.
  2. After assembling the bottom formwork of the top plate part, removing the suspension base extending downward from the support, adjusting the position of the rebar of the top plate part, and then placing concrete in the formwork construction method of the top plate portion of claim 1 reinforced concrete structure, wherein the creating a top plate portion.
  3. The support construction method of the top plate portion of claim 1 or 2 reinforced concrete structure, wherein the a pipe roof formed by arranging a plurality of pipes in parallel.
JP2000245344A 2000-08-11 2000-08-11 Construction method of top plate part of reinforced concrete structure Expired - Fee Related JP3721505B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000245344A JP3721505B2 (en) 2000-08-11 2000-08-11 Construction method of top plate part of reinforced concrete structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000245344A JP3721505B2 (en) 2000-08-11 2000-08-11 Construction method of top plate part of reinforced concrete structure

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JP3721505B2 true JP3721505B2 (en) 2005-11-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102877858A (en) * 2012-09-26 2013-01-16 安徽理工大学 Reinforcing method for crushed top plate of coal face

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102877858A (en) * 2012-09-26 2013-01-16 安徽理工大学 Reinforcing method for crushed top plate of coal face
CN102877858B (en) * 2012-09-26 2015-07-01 安徽理工大学 Reinforcing method for crushed top plate of coal face

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