JP3693989B2 - Construction method of slab with steps - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a construction method for a stepped slab capable of constructing a stepped slab in which an upper step portion and a lower step portion are integrated at a step portion on site.
[0002]
[Prior art]
In general, a PC composite floor is a structure in which a precast PC plate and cast-in-place concrete are integrated to construct a concrete floor slab. In particular, a stepped PC plate is a floor with a difference in height of a building, such as a bathroom part. Used for. In recent years, in housing and public buildings, barrier-free design philosophy in which floor steps are eliminated in consideration of users such as the elderly and the physically disabled has become common. In the design of on-site concrete floors, if there is a partial height difference in the floor due to finishing, equipment piping, etc., in order to construct a floor slab low in advance, a small beam and a grandchild beam are provided. It was.
However, in this case, the construction is complicated, and there are cases where inconveniences in the design plan arise due to the provision of the small beams in a building where the floor height is severely restricted.
[0003]
Therefore, an integrated step slab with pre-stress was developed to streamline construction. The stepped slab in which the upper and lower portions are integrated at the stepped portion is sufficient in terms of strength, but only one or two can be manufactured in one mold for manufacturing. Was also expensive.
[0004]
In order to solve this problem, a method for constructing a slab with a step is proposed in which precast PC plates 1 and 1 as shown in FIGS. Has been. Here, FIG. 12 is a longitudinal sectional view showing a conventional separate type stepped slab, and FIG. 13 is a principal sectional view showing the step portion. The precast PC plate 1 was only reinforced by the reinforcing bars 3 with almost no overlap at the stepped portion.
[0005]
[Problems to be solved by the invention]
However, the conventional method for constructing a slab with a step has a drawback that even if the deformation performance with respect to a long-term load can cope with a short span floor, it cannot cope with a large span floor.
[0006]
The present invention has been proposed in view of the above, and provides a construction method for a stepped slab that can accommodate a large-span floor and can construct a stepped slab by combining a plurality of slab elements on site. Objective.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a method for constructing a stepped slab in which a first slab element and a second slab element are integrated via a stepped portion, wherein the first slab element ( 11 ) Has a rib (11a) disposed in the longitudinal direction, and an insertion rib (11b) that is continuous with the rib and protrudes from the end face, and the second slab element ( 12 ) and the above-mentioned overlay an insertion rib (11b) of the first slab element (11), characterized in that integrated with Da設concrete from ambient to Haisuji the rebar (14) in the overlapped portions .
[0008]
Further, in the present invention, the insertion rib has a cotter (17) in a direction perpendicular to the longitudinal direction on the outer periphery thereof, in which a PC steel (16) is disposed and tension is introduced. .
[0009]
In the present invention, the second slab element (12) includes a rising wall (18) that forms a step at the tip, the first slab element is placed on the upper end of the rising wall (18), and a difference is provided. The embedded ribs are overlapped with the second slab element (12) at a predetermined interval, and a reinforcing bar (14) is placed on the overlapped portion, and concrete is placed from the periphery to be integrated. It is characterized by.
[0010]
In the present invention, the second slab element (12) includes a rising wall (18) that forms a step at the tip, and a tall rising wall that is erected at a position retracted from the rising wall (18) by a predetermined distance. (19), and the tall rising wall (19) includes an insertion hole (20) for inserting a reinforcing bar .
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment. FIG. 1 is a perspective view of a stepped slab constructed by a method for constructing a stepped slab according to the present invention, and FIG. 2 is a longitudinal sectional view of the stepped slab. Here, the stepped slab 10 is obtained by integrating a first slab element 11 and a second slab element 12 via a stepped portion 13, and the first slab element 11 and the second slab element 12 are integrated. A part of the slab element 12 is overlapped and overlapped, a reinforcing bar 14 is arranged on the overlapped part, and a concrete 15 is placed from the periphery to be integrated.
[0013]
The 1st slab element 11 is shape | molded in the state by which tension | tensile_strength was provided to PC steel material 16, as shown in FIGS. In addition, a rib 11a is provided on the upper surface, and an insertion rib 11b is provided at the tip. The insertion rib 11b is formed thinner than the main body, the PC steel material 16 is arranged, and the cotters 17 are formed on both side surfaces and the bottom surface. The cotter 17 is configured by forming a plurality of concave grooves on the side surface of the insertion rib 11b.
[0014]
Moreover, the 2nd slab element 12 has the rising wall 18 which comprises the front-end | tip of a level | step difference as shown to FIG. Furthermore, the second slab element 12 has a rising wall 19 that forms the rear end of the stepped portion. The rising wall 19 is formed with an insertion hole 20 for inserting the reinforcing bar 15 at an appropriate position. Similarly to the first slab element 11, the second slab element 12 is molded in a state where tension is applied to a PC steel material (not shown).
[0015]
A construction method of a stepped slab using the first slab element 11 and the second slab element 12 configured as described above will be described. First, as shown in FIG. 11, the insertion rib 11 b of the first slab element 11 is placed between the rising wall 18 and the rising wall 19 of the second slab element 12. Next, as shown in FIGS. 9 and 10, the reinforcing bar 14 is arranged in the stepped portion. The examples shown in FIGS. 8 and 10 are cases where the rising wall 19 is not provided, and the rising wall 19 is not necessarily required. As shown in FIG. 11, when the rising wall 19 is provided, the reinforcing bar 14 is inserted into the insertion hole 20. In this way, the first slab element 11 and the second slab element 12 are partially overlapped and supported by a support member (not shown) from below, and then the concrete 15 is placed to form a stepped portion. Integrate.
[0016]
Thus, according to the construction method of the stepped slab of the present invention, the first slab element 11 and the second slab element 12 are partially overlapped and the reinforcing bars 14 are arranged, and then concrete is placed. Since the step portion is formed and integrated, the stepped slab can be constructed at low cost. Moreover, since the reinforcing bar 14 is arranged, sufficient proof stress can be obtained. Therefore, a large span slab can be constructed. Furthermore, the deformation performance within an allowable range can be maintained even for a long-term load. In addition, since the cotter 17 is provided on the insertion rib 11b, there is no possibility of pulling out even if the joining force increases and stress is applied.
[0017]
FIG. 3 is a cross-sectional view showing an example in which a bathroom is constructed using the stepped slab 10 of the present invention. By using the slab 10 with a step and installing the bathtub 21, the washing place 22, and the supply / discharge pipe 23 in the lowered part, a barrier-free living space without a step can be formed between adjacent rooms. .
[0018]
【The invention's effect】
Since this invention consists of an above-described structure, there can exist an effect which is demonstrated below.
[0019]
In invention of Claim 1, It is the construction method of the slab with a level | step difference which the 1st slab element and the 2nd slab element integrated through the level | step-difference part, Comprising: Said 1st slab element ( 11) is , A rib (11a) disposed in the longitudinal direction, and an insertion rib (11b) that is continuous with the rib and protrudes from the end face, and the second slab element ( 12 ) and the first superimposing of the insertion rib of the slab element (11) (11b), since the integrated with Da設concrete from ambient to Haisuji the rebar (14) in the overlapped portion, the step portion reinforcing bars only It is superior to the conventional one reinforced with Further, the span width can be increased as compared with the conventional case. For example, a span from about 8 m to 12 m can be handled.
[0020]
According to the invention described in claim 2, the insertion rib is provided with a PC steel material (16) and a tensile force is introduced, and a cotter (17) perpendicular to the longitudinal direction on the outer periphery. Since it has, it becomes difficult to come off and a stronger bond is possible. Accordingly, it is possible to obtain a greater proof stress as compared with the conventional case and to reduce the total amount of bending.
[0021]
According to the invention described in claim 3, the second slab element (12) includes a rising wall (18) that forms a step at a tip, and the first slab element (12) is provided at an upper end of the rising wall (18). The slab element is placed, and the insertion rib is overlapped with the second slab element (12) at a predetermined interval, and a reinforcing bar (14) is placed on the overlapped portion, and the concrete is placed from the periphery. Since it is cast and integrated , the coupling of the overlapping portions of the first slab element and the second slab element can be further strengthened. For this reason, it can respond to a large span floor slab. Moreover, the waste of concrete can be eliminated when placing concrete .
[0023]
According to a fourth aspect of the present invention, the second slab element (12) has a rising wall (18) that forms a step at the tip, and a position that is retracted from the rising wall (18) by a predetermined distance. Since the tall rising wall (19) is erected and the tall rising wall (19) is provided with the insertion hole (20) for inserting the reinforcing bar, the first slab element and the second rising wall (19) are provided. Reinforcing bars can be made to act more effectively when performing the bar arrangement work of the overlapping portion with the slab element .
[Brief description of the drawings]
FIG. 1 is a perspective view of a stepped slab constructed by a method for constructing a stepped slab according to the present invention.
FIG. 2 is a longitudinal sectional view of the stepped slab.
FIG. 3 is a cross-sectional view showing a construction example using the stepped slab.
FIG. 4 is a side view showing a first slab element used in the construction method of a stepped slab according to the present invention.
FIG. 5 is a plan view showing a first slab element.
FIG. 6 is a side view showing the insertion part of the first slab element.
FIG. 7 is a front view showing the insertion part of the first slab element.
FIG. 8 is a longitudinal sectional view showing a step portion of the stepped slab.
FIG. 9 is a plan view showing a step portion of the stepped slab.
FIG. 10 is a perspective view showing a step portion of the stepped slab.
FIG. 11 is an explanatory view showing a joint portion in the construction method for a stepped slab according to the present invention.
FIG. 12 is a longitudinal sectional view showing a conventional plug-type stepped slab.
FIG. 13 is a cross-sectional view of a main part showing a step portion of a conventional plug-type stepped slab.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Slab 11 with a level | step difference 1st slab element 11a Rib 11b Insertion rib 12 2nd slab element 13 Step part 14 Reinforcement 15 Concrete 16 PC steel material 17 Cotter 18 Standing wall 19 Standing wall 20 Insertion hole 21 Bathtub 22 Washing place 23 Supply Exhaust pipe

Claims (4)

A construction method for a stepped slab in which a first slab element and a second slab element are integrated via a stepped portion,
The first slab element ( 11) has a rib (11a) disposed in the longitudinal direction, and an insertion rib (11b) which is continuous with the rib and protrudes from an end surface . The slab element ( 12 ) and the insertion rib (11 b) of the first slab element (11) ,
Construction method of stepped slab characterized by integrating the superimposed portion reinforcing bars (14) Haisuji and by Da設concrete from around the. 2. The insertion rib according to claim 1, wherein a PC steel material (16) is arranged and a tension force is introduced, and the outer periphery has a cotter (17) perpendicular to the longitudinal direction on the outer periphery. Construction method for slabs with different steps. The second slab element (12) comprises a rising wall (18) forming a step at the tip,
The first slab element is placed on the upper end of the rising wall (18), and the insertion rib is overlapped with the second slab element (12) at a predetermined interval,
A method for constructing a stepped slab according to claim 1 or 2, characterized in that a reinforcing bar (14) is placed in the overlapped portion and concrete is cast from the periphery to integrate them . The second slab element (12) includes a rising wall (18) that forms a step at the tip, and a tall rising wall (19) that is erected at a position retracted from the rising wall (18) by a predetermined distance. ,
The construction method for a stepped slab according to claim 3, wherein the tall rising wall (19) includes an insertion hole (20) for inserting a reinforcing bar .

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