JP3955372B2 - Floor slab formwork - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a floor slab form used to form road surfaces such as viaducts. More specifically, the present invention relates to a formwork for a floor slab that is manufactured in advance in a factory and transported to the site, and then installed there to form a floor slab such as a road surface.
[0002]
[Background]
As a method of forming floor slabs for viaduct roads, etc., all of the rebar processing, bar arrangement, and formwork processing that were previously performed in the field are performed in the factory, and the floor slab formwork that integrates them is manufactured. In addition, a precast method is known in which after transporting this to the site, a floor slab form is laid on the bridge main girder and concrete is placed therein to form the floor slab.
[0003]
Conventionally, as a formwork for a floor slab used in this type of precast method, as shown in FIG. 8, a plurality of I-shaped beams 102 are arranged and fixed in parallel to each other on a thin steel plate 101. In this structure, the reinforcing bars 103 and 104 are vertically arranged perpendicular to the beam 102.
[0004]
[Problems to be solved by the invention]
However, in the conventional slab formwork structure, when the number of the beams 102 arranged on the steel plate 101 is small, the interval between the beams 102 becomes large, and as a result, the steel plate 101 is likely to be swelled, and this is prevented. Therefore, a large number of beams 102 are provided. This not only leads to an increase in cost, but also increases the overall weight and impairs handling and workability.
[0005]
In addition, the concrete 105 placed in the formwork for floor slab is divided by the beam 102, that is, because the structure is partitioned by the beam 102, this partition tends to prevent filling of the concrete or cause cracks. There is also a problem.
[0006]
The object of the present invention is to eliminate the above-mentioned conventional drawbacks, is economical, does not impair the handling and workability, and improves the filling of concrete and can reduce the cause of cracks. To provide a frame.
[0007]
[Means for Solving the Problems]
The formwork for floor slab of the present invention connects a plurality of formwork units arranged adjacent to each other across a plurality of main girders installed in parallel to each other and the formwork units arranged adjacent to each other on the main girder. The mold unit is provided with a thin plate-like bottom plate constituting member constituting the bottom mold and a predetermined height from the upper surface of the bottom plate provided on the upper surface of the bottom plate constituent member at regular intervals and substantially parallel to each other. A plurality of reinforcing ribs, and at least two supporting beam constituent members disposed on the reinforcing ribs substantially perpendicularly to the reinforcing ribs and having a length substantially corresponding to the length of the bottom plate constituent member And the adjacent support beam components are arranged adjacent to each other, and the coupling mechanism is arranged across the adjacent support beam components and connects the support beam components. You And bonding the plate, characterized in that it is configured to include a vertical support member mounted on the main beam with attached to the joining plate.
[0008]
Here, the size of the bottom plate is arbitrary, but for example, it is preferably a width dimension that can be transported by a truck or the like. About a length dimension, what is necessary is just to determine according to the width dimension of the road to construct.
Further, the reinforcing rib has a strength capable of preventing the bottom plate from being bent in a direction orthogonal to the longitudinal direction of the support beam constituting member , and a height capable of securing a concrete cover on the reinforcing bars arranged in the mold. Any cross-sectional shape may be used as long as it is a thing.
Further, the cross-sectional shape of the support beam constituting member is arbitrary such as a Z-shape or a C-shape, but may be any as long as it has a strength capable of supporting the panel during concrete placement.
[0009]
According to such a configuration, the plurality of reinforcing ribs provided on the upper surface of the bottom plate at regular intervals and substantially parallel to each other can suppress bending in the width direction of the bottom plate (longitudinal direction of the reinforcing ribs), Further, the bending of the bottom plate in the longitudinal direction (direction perpendicular to the longitudinal direction of the reinforcing rib) can be suppressed by at least two support beam constituent members provided on the reinforcing rib substantially orthogonally to the reinforcing rib.
Since this requires only at least two support beams (support beams formed by continuous support beam constituent members) , this is compared with a configuration in which a plurality of I-shaped beams are arranged parallel to each other on a conventional steel plate. It can be economically configured and can be reduced in weight. Therefore, handling property and workability can be improved.
[0010]
In addition, since the support beam component is lifted from the top surface of the bottom plate by the height of the reinforcing rib, when the concrete is placed in the formwork, the placed concrete has a gap between the support beam and the bottom plate. Since they are connected through each other, that is, they are not partitioned by the I-shaped beam as in the prior art, the filling of the concrete is smooth and the cause of cracks can be reduced.
In addition, if the reinforcing rib has a predetermined height from the upper surface of the bottom plate, it is possible to ensure the covering of the reinforcing bars when placing concrete.
[0012]
Moreover , since the formwork for floor slabs is configured by a combination of a plurality of formwork units, the length dimension of the formwork for floor slabs can be arbitrarily selected by selecting the number of formwork units. Therefore, even if the width dimension of the road to be constructed is different, it can be easily handled.
In addition, this means that each formwork unit is transported to the site in a disassembled state, and after placing each formwork unit on the site, it is only necessary to connect adjacent formwork units, so a large truck is required. It can be transported without the need for transportation, that is, transportation costs can be reduced and transportation can be performed easily.
[0013]
In the above configuration, among the plurality of mold units, the mold unit positioned on both sides is preferably connected to the adjacent mold unit so that the outermost end side can be inclined upward. .
Since the formwork units located on both sides have a cantilevered support structure, there is a risk of bending downward due to vibration during transportation of the formwork for floor slabs or the weight of concrete when placing concrete on site. However, since the outermost end side is connected so as to be inclined upward, these bendings can be reduced.
[0014]
In addition, it is preferable that the support beam constituting member is formed with arbor holes having insertion holes and positioning holes having different diameters that are communicated with each other through a part along a longitudinal direction thereof at a constant pitch interval.
If it does in this way, also when arrange | positioning a reinforcing bar, since the reinforcing bar should just be inserted through the insertion hole with a large diameter of a dart hole first, insertion is easy. In addition, when the reinforcing bar is moved from the insertion hole to the positioning hole having a small diameter, the reinforcing bar is positioned by the positioning hole, so that the reinforcing bar can be positioned at a correct position.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a viaduct road formed using the floor slab form of the present embodiment. In the viaduct road, a plurality of (four) bridge main girders 2 are installed in parallel with each other on the pier 1, and a floor slab 3 is formed on these bridge main girders 2. In this structure, pavement 4 is provided and wall rail 5 is erected.
[0016]
In forming the floor slab 3, as shown in FIG. 2, the floor slab form 11 of the present embodiment is disposed on the bridge main girder 2 across the bridge main girder 2 and is not shown. A similar floor slab form 11 is arranged along the longitudinal direction of the bridge main girder 2 adjacent to. Subsequently, after placing reinforcing bars (not shown) in these, concrete is placed. Thereby, the floor slab 3 is formed.
[0017]
Now, the formwork 11 for floor slabs according to the present embodiment is formed by a plurality of formwork units as shown in FIG. That is, three intermediate formwork units 12A, 12B, and 12C arranged in the middle, end formwork units 12D and 12E arranged on both sides thereof, and adjacent formwork units 12A to 12E are connected. And a connecting mechanism 16 to be connected.
[0018]
Each of the mold unit 12A to 12E includes a thin plate-like bottom plate constituting member 13A to 13E constituting a bottom mold, and a plurality of the plate unit 12A to 12E provided substantially parallel to each other on the upper surface of the bottom plate constituting member 13A to 13E. The reinforcing ribs 14A to 14E, and at least two of the reinforcing ribs 14A to 14E, the length of the reinforcing ribs 14A to 14E being substantially perpendicular to the length of the reinforcing ribs 14A to 14E. The support beam constituting members 15A to 15E are included.
[0019]
Of the bottom plate constituting members 13A to 13E, the bottom plate constituting members 13A to 13C are, as shown in FIG. 4, having a width dimension W within a transport width limit such as a truck (for example, 1.5 m) and a length. It is formed of a thin plate steel plate having a predetermined dimension, and has inclined portions 21 inclined downward at both ends in the longitudinal direction. The bottom plate constituent members 13D and 13E are formed of a thin steel plate having a width dimension W within a transport width limit such as a truck (for example, 1.5 m) and a length shorter than the bottom plate constituent members 13A to 13C. At the outer end in the longitudinal direction, an upright portion 22 is provided that rises upward. Here, a thin plate-like bottom plate 13 constituting the bottom formwork of the floor slab is constituted by these bottom plate constituting members 13A to 13E.
[0020]
As shown in FIG. 5, the reinforcing ribs 14 </ b> A to 14 </ b> E have a predetermined height from the upper surface of each bottom component member 13 </ b> A to 13 </ b> E, specifically, a channel having a U-shaped cross section having a height that can secure the cover of a reinforcing bar described later. It is composed of materials. The upper and lower flange surfaces 23 and 24 of the channel material are provided with bonding holes 25 at positions where they are in contact with the support beam constituting members 15A to 15E and the bottom plate constituting members 13A to 13E. The component holes 15A to 15E and the bottom plate component members 13A to 13E are also provided with bonding holes 26 and 27, respectively. The support beam constituting members 15A to 15E, the reinforcing ribs 14A to 14E, and the bottom plate constituting members 13A to 13E are integrally joined by the rivets 28 inserted therein.
[0021]
As shown in FIGS. 4 and 5, the support beam constituting members 15 </ b> A to 15 </ b> E include flanges 32 that protrude in the opposite directions and in the horizontal direction above and below the vertical web surface 31 by bending a strip-shaped steel plate having a predetermined width. It is comprised by the cross-sectional Z-shaped bending material which has 33. FIG. However, the present invention is not limited to this, and may be a channel material having a C-shaped cross section having flanges protruding in the same direction and in the horizontal direction above and below a vertical web surface. The bent material is provided with the joining hole 26 in the flange 33 below the bent member, and a sword hole having an insertion hole 34A and a positioning hole 34B that are in communication with each other through the web surface 31 and have different diameters. 34 are formed at regular pitch intervals in the vertical direction along the longitudinal direction. Here, the support beam constituting members 15A to 15E of the mold units 12A to 12E constitute at least two support beams 15 arranged on the reinforcing ribs 14A to 14E substantially orthogonally to these. .
[0022]
The connecting mechanism 16 for connecting the support beam constituting members 15A to 15E is configured as shown in FIG. 6, for example. FIG. 6 shows the connecting portion mechanism 16 between the support beam constituting members 15B and 15D, but the other structures are the same. That is, the coupling mechanism 16 includes a joining plate 18 having a U-shaped cross section disposed across adjacent support beam constituent members 15A to 15E, and a vertical support member vertically attached to the joining plate 18 by several bolts or the like. 17. The lower end of the vertical support member 17 is set at substantially the same height as the lower ends of the bottom plate constituting members 13A to 13E on both sides.
[0023]
Next, the operation of this embodiment will be described.
In the factory, the floor slab form 11 having a length corresponding to the width of the viaduct to be constructed is manufactured. For this purpose, after the intermediate formwork units 12A, 12B, 12C and the end formwork units 12D, 12E are manufactured in advance, the support beam constituting members 15A-15E of the respective formwork units 12A-12E are continuous. As described above, the respective formwork units 12A to 12E are arranged adjacent to each other, and the adjacent support beam constituting members 15A to 15E are joined by the joining plate 18 having the vertical support member 17.
[0024]
At this time, since the mold units 12D and 12E located on both sides have a cantilever support structure, they may be bent downward due to vibration during transportation or the weight of the placed concrete. It connects so that the outermost end side may incline upward with respect to 12B and 12C. That is, the support beam constituent members 15D and 15E are bolted to the joining plate 18 in a tilted state.
In this way, after the floor slab form 11 having a predetermined length is manufactured, it is transported to the site. At this time, since the width dimension of the floor slab form 11 is within the transport width limit, it can be transported as it is. In addition, when the length of the formwork 11 for floor slabs has trouble at the time of transportation with a truck, the number of formwork units of the range which does not produce trouble will be connected.
[0025]
At the site, the transported floor slab form 11 is bridged over the bridge main girder 2 and adjacent to the longitudinal direction of the bridge main girder 2. Then, the lower end of the vertical support member 17 of the floor slab formwork 11 is installed in a posture on the upper surface of the bridge main girder 2. At this time, the gaps between the end edges of the bottom plate constituting members 13A to 13E of the respective mold unit 12A to 12E and the upper surface of the bridge main girder 2 are sealed by appropriate means.
[0026]
Next, as shown in FIG. 7, the reinforcing bar 41 is inserted through the darling hole 34 of the support beam 15 of the floor slab formwork 11. At this time, the reinforcing bar 41 is inserted into the insertion hole 34A of the daruma hole 34 and then slid into the positioning hole 34B. Thereby, the reinforcing bar 41 is arranged in a state of being positioned by the positioning hole 34B. Further, the reinforcing bars 42 are arranged orthogonal to the reinforcing bars 41, and these intersections are bound by appropriate means.
In this state, concrete is placed in these floor slab forms 11. After the concrete has hardened, pavement 4 is applied thereon, and wall rails 5 are erected on both sides. Thereby, a viaduct road can be constructed.
[0027]
Therefore, according to the present embodiment, the plurality of reinforcing ribs 14A to 14E provided on the upper surface of the bottom plate 13 at regular intervals and substantially in parallel to each other provide the width direction of the bottom plate 13 (the longitudinal direction of the reinforcing ribs 14A to 14E). ), And the longitudinal direction of the bottom plate 13 (longitudinal direction of the reinforcing ribs 14A to 14E) is provided by at least two support beams 15 provided substantially perpendicular to the reinforcing ribs 14A to 14E. Can be suppressed. In other words, since at least two support beams 15 are required, it is possible to construct an economical structure and to reduce the weight as compared with a conventional structure in which a plurality of I-shaped beams are arranged in parallel to each other on a steel plate. Therefore, handling property and workability can be improved.
[0028]
Further, since the support beam 15 floats from the upper surface of the bottom plate 13 by the height of the reinforcing ribs 14A to 14E, when the concrete is placed in the floor slab form 11, the placed concrete is supported. Since it is connected through the gap between the beam 15 and the bottom plate 13, that is, it is not partitioned by the I-shaped beam as in the prior art, the filling of the concrete is improved and the cause of the occurrence of cracks can be reduced. it can.
In addition, if the reinforcing ribs 14A to 14E have a predetermined height from the upper surface of the bottom plate 13, it is possible to ensure the covering of the reinforcing bars 41 and 42 when placing concrete.
[0029]
Moreover, the formwork 11 for floor slabs is made up of a plurality of formwork units 12A to 12E composed of bottom plate constituting members 13A to 13E, reinforcing ribs 14A to 14E and supporting beam constituting members 15A to 15E. 15E are arranged adjacent to each other so that the supporting beam constituting members 15A to 15E of the adjacent form unit 12A to 12E can be connected to each other by the connecting mechanism 16, that is, a plurality of form plates 11 for floor slabs are provided. Therefore, the length dimension of the floor slab form 11 can be arbitrarily selected by selecting the number of the form units 12A to 12E. Therefore, even if the width dimension of the road to be constructed is different, it can be easily handled.
[0030]
In addition, this means that each formwork unit 12A to 12E is transported to the site in a disassembled state, and each formwork unit 12A to 12E is arranged on the site, and then the adjacent formwork units 12A to 12E are connected to the connecting mechanism 16. Can be transported without the need for a large truck, that is, transportation costs can be reduced and transportation can be easily performed.
[0031]
Further, the formwork units 12D and 12E located on both sides are connected to the formwork units 12B and 12C adjacent to the formwork units 12B and 12C so that the outermost end side is inclined upward, so that the bending at the time of placing the concrete is reduced. Less. Normally, the formwork units located on both sides have a cantilevered support structure, so that they bend downward due to vibration during transportation of the formwork 11 for floor slabs, the weight of concrete when concrete is placed on site, and the like. Although there is a possibility, since the outermost end side is connected so that it can incline upward, these bending can also be reduced.
[0032]
Further, since the support beam constituting members 15A to 15E are formed of a Z-shaped bent material formed by bending a strip-shaped steel plate having a predetermined width, the bonding holes 26 are previously formed in the strip-shaped steel plate having a predetermined width. After that, if it is bent into a Z shape, the bonding hole 26 can be positioned with high accuracy. In addition, since the cross section is Z-shaped, that is, the upper flange 32 is not directly above the lower flange 33, the rivets 28 are inserted into the joining holes 26 provided in the flange 33, and the reinforcing ribs 14A to 14E. Also when joining, it can work easily.
[0033]
Further, since the dart holes 34 having the insertion holes 34A and the positioning holes 34B having different diameters are formed on the web surfaces 31 of the support beam constituting members 15A to 15E at a constant pitch interval, also when the reinforcing bars 41 are arranged. First, since the reinforcing bar 41 has only to be inserted into the insertion hole 34A having a large diameter of the daruma hole 34, the insertion is easy. Moreover, when the reinforcing bar 41 is moved from the insertion hole 34A to the positioning hole 34B having a small diameter, the reinforcing bar 41 is positioned by the positioning hole 34B, so that the reinforcing bar 41 can be positioned at a correct position.
[0034]
In the above embodiment, after the floor slab form 11 is transported to the site and installed on the bridge main girder 2, the reinforcing bars 41 and 42 are arranged on the floor slab form 11. The reinforcing bars 41 and 42 may be incorporated into the plate mold 11 and transported to the site in this state. In this way, the work at the site can be further reduced.
[0035]
Further, in the above embodiment, the floor slab form used to form the floor slab for the bridge has been described, but the floor slab form of the present invention is not necessarily limited to this, and other floor slabs are used. Can be used for
[0036]
【The invention's effect】
According to the formwork for floor slabs of the present invention, it can be constructed economically, handling and workability can be improved, concrete filling can be improved, and the cause of occurrence of cracks can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a viaduct road constructed using a floor slab form according to the present invention.
FIG. 2 is a perspective view showing a situation at the time of floor slab construction on the viaduct road.
FIG. 3 is a perspective view showing a floor slab form according to the embodiment.
4 is an enlarged perspective view of a part of FIG. 3;
FIG. 5 is a sectional view of a floor slab form according to the embodiment.
FIG. 6 is a perspective view showing a connecting portion of adjacent mold unit in the floor slab form of the embodiment.
FIG. 7 is a perspective view showing a state in which reinforcing bars are arranged in the floor slab form of the embodiment.
FIG. 8 is a cross-sectional view showing a conventional floor slab structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bridge pier 2 Bridge main girder 3 Floor slab 4 Pavement 5 Wall height column 11 Floor slab form 12A-12E Formwork unit 13 Bottom plate 13A-13E Bottom plate structural member 14A-14E Reinforcement rib 15 Support beam 15A-15E Support beam structural member 16 Coupling mechanism 34 Daruma hole 34A Insertion hole 34B Positioning hole

Claims (3)

A plurality of formwork units arranged adjacent to each other across a plurality of main girders installed in parallel to each other, and a connecting mechanism for connecting the formwork units arranged adjacent to each other on the main girder,
The mold unit includes a thin plate-like bottom plate constituting member constituting the bottom mold, and a plurality of reinforcements provided on the upper surface of the bottom plate constituting member at regular intervals and substantially parallel to each other and having a predetermined height from the upper surface of the bottom plate. A rib, and at least two support beam constituent members disposed on the reinforcing rib substantially perpendicular to the ribs and having a length substantially corresponding to the length dimension of the bottom plate constituent member. And the adjacent support beam components are arranged adjacent to each other,
The connecting mechanism includes a joining plate arranged across the supporting beam constituent members arranged adjacent to each other, and a vertical supporting member attached to the joining plate and installed on the main beam. A formwork for floor slabs characterized by comprising . 2. The formwork for floor slab according to claim 1 , wherein among the plurality of formwork units, the formwork units located on both sides can be inclined upward on the outermost end side with respect to the formwork unit adjacent thereto. Formwork for floor slabs characterized by being connected to. In deck for formwork according to claim 1 or claim 2, wherein the support beam structure member along its longitudinal direction, having mutually communicating and different insertion holes and positioning holes diameters through some A slab formwork characterized in that daruma holes are formed at regular pitch intervals.

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