JPH11166285A - Forms for placing concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide forms for placing concrete to simplify an arrangement work for support when a piping, a duct, or other apparatus are suspended for arrangement, and to prevent an arrangement place and variation thereof from limitation. SOLUTION: Forms for placing concrete comprise a base 11 formed of a steel; and a number of reinforcing members 12 welded on a concrete placing surface 11a of the base 11 at intervals in the direction of the surface and buried in placed concrete C. A number of through-holes 12a filled with the concrete C are formed in the reinforcing member 12 along the concrete placing surface 11a of the base 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a formwork used for placing concrete such as concrete slabs and walls.

[0002]

2. Description of the Related Art Conventionally, as a method of constructing concrete slabs and walls, for example, as a method of constructing concrete slabs, a wooden formwork or a plywood formwork is supported by a large number of erections standing on the lower floor. The above-mentioned formwork is installed over the entire floor surface, concrete is laid to a predetermined thickness after reinforcing the upper surface of the formwork, and after curing and solidification of the concrete, the formwork is removed together with the support. A method of constructing a concrete slab is known. And the shoring works to prevent the formwork from being bent by the weight of the concrete to be cast, and to suppress the displacement of the positional relationship between the concrete in the concrete slab to be constructed and the reinforcing bars arranged. Also, the smoothness of the concrete slab to be constructed is ensured.

In the method of constructing a concrete slab using such a wooden formwork or a plywood formwork, a large number of supports for supporting the formwork are required at the time of construction. The lower part is occupied by the above-mentioned support, and it is impossible to carry equipment to the floor below the concrete slab under construction.Therefore, the construction work of the concrete slab and various works on the lower floor are performed in parallel. Since it cannot be performed, there is a problem that the construction period is lengthened.

Further, below the concrete slab,
If pipes or air conditioning ducts or other equipment are to be suspended, support or fixtures for mounting the above equipment in accordance with the installation position should be installed beforehand when casting concrete, or It is necessary to previously embed the metal fittings for fixing these supports and the fixing fittings in correspondence with the installation positions of the devices. However, in the above-mentioned conventional concrete slab construction method, when the installation position of the equipment is changed due to, for example, a design change, or the weight of the equipment to be installed is changed, the above-described support, fixing bracket, or embedding is required. The installation position and size of hardware and the like, the span, etc. must be shifted accordingly. At this time, it is easy to move and replace the concrete before placing concrete and before arranging the reinforcing bars, but after arranging the reinforcing bars, the above-mentioned support and It is not possible to move the fixing bracket or embedded metal, and after concrete casting, since the concrete at the installation position must be handled and the support, fixing metal or embedded metal must be installed, There is a problem that the work becomes complicated. In particular, it is a large-scale operation to change the installation position of the equipment after the concrete is poured.

Conventionally, in order to cope with such a problem, there has been proposed a slab construction method as shown in FIGS.

The concrete slab construction method shown in these figures is based on a deck plate 1 made of a corrugated steel sheet.
Is formed so as to be bridged between the beams of the structure to form a formwork. At a predetermined position of the deck plate 1, an embedded metal member 3 having an anchor bolt 2 protruded is installed and welded or the like. At the same time, a padding 4 for preventing concrete from entering these gaps is installed between the embedded metal member 3 and the deck plate 1 (see FIG. 8). Then, as shown in FIG. Then, after arranging a reinforcing bar T above the deck plate 1, concrete C is poured on the upper surface of the deck plate 1 as shown in FIG. 10, and the concrete C is cured and solidified to form a concrete slab S. The above deck plate 1
Is left as a constituent member of the constructed concrete slab S. According to such a construction method, since the strength of the deck plate 1 serving as a formwork is large, the bending of the deck plate 1 is suppressed, and accordingly, the number of supports provided between the deck floor and the lower floor is reduced, Or the unnecessary result,
By expanding the work area on the lower floor, it is possible to perform some work on the lower floor in parallel with the construction work on the concrete slab S above.

In order to suspend equipment such as pipes and ducts, the portion of the deck plate 1 where the padding 4 is installed is cut and removed by working from below the concrete slab S as shown in FIG. Thereby, the embedded metal 3 integrated with the concrete C is exposed downward by the anchor bolt 2, and then, as shown in FIG. 12, the support 5 is fixed to the embedded metal 3 by welding or the like. Various devices are hung from the concrete C using these hanging hardware 5. As described above, when the above-mentioned equipment is suspended, it is performed through the embedded hardware 3 integrated with the concrete C because the connection strength between the deck plate 1 and the concrete C is small, This is because if the device is directly suspended from the concrete C, the deck plate 1 is likely to peel off from the concrete C and bend depending on its weight.

[0008]

By the way, even in the method of constructing a concrete slab S using such a deck plate 1, an embedded metal 3 for suspending equipment such as pipes and ducts, and an embedded metal 3 below. In order to prevent the intrusion of the concrete C into the padding 4, and to expose the embedded metal 3, it is necessary to confirm the mounting position of the embedded metal 3 and to cut and remove the deck plate 1. And after exposing this embedded metal part 3,
The support 5 must be welded to this embedded metal part 3,
In addition, since these operations are upward operations, there is a problem that the operations are extremely complicated.

Further, when the installation position of the equipment is changed, the embedded metal member 3 is attached to the deck plate 1.
After being attached to the, the embedded metal fittings 3
Since the new embedded hardware 3 must be installed at the changed position while keeping the, the unnecessary embedded hardware 3 is wasted. On the other hand, after placing concrete C,
When it is necessary to change the installation position of the device due to remodeling or the like, it is necessary to cut and remove the deck plate 1 at the changed position, then handle the concrete C and mount the embedded metal member 3, Also in this case, the operation of changing the installation position is complicated.

SUMMARY OF THE INVENTION The present invention has been made to effectively solve the problems of the conventional concrete casting formwork, and has a structure such as a support for hanging a pipe, a duct or other equipment. An object of the present invention is to provide a concrete casting formwork in which installation work is simple and the installation place and its change are not restricted.

[0011]

According to a first aspect of the present invention, there is provided a concrete casting formwork which is integrated with the concrete to form a part of a structure after the concrete is casted. A base made of a steel plate, and a large number of reinforcing members that are welded to the concrete casting surface of the base at intervals in the plane direction and are embedded in the cast concrete, and these reinforcing members include: A plurality of through holes are formed along the concrete casting surface of the base and filled with the concrete. The invention according to a second aspect is characterized in that a reinforcing bar is inserted through a through hole formed in the reinforcing member according to the first aspect.

Further, the invention described in claim 3 is the first invention.
Alternatively, the dimensions of the base and the reinforcing member and the number of the reinforcing members according to claim 2 are reduced, and the formwork constituted by the base and the reinforcing member is not bent by the weight of the concrete to be cast. Equipment to be suspended,
It is characterized in that it is set to withstand the weight of the pipe and to withstand the fluctuation of the withstand load after completion.

According to the present invention, a large number of reinforcing members integrally welded to the concrete casting surface of the base are buried in the concrete to be cast. The base and the concrete are integrated through these reinforcing members, and as a result, the connection strength between the base and the concrete can be strengthened over almost the entire surface of the base. And, as described above, since the connection strength between the base and the concrete is strengthened over almost the entire surface of the base, when attaching various devices such as pipes and ducts to the base, the above-described devices are almost completely covered with the base. Thus, the strength with respect to the mounting of the above-mentioned devices can be secured, whereby the restrictions on the mounting positions of the above-described devices can be relaxed, and changes in the mounting positions can be easily handled.

Further, the rigidity of the base is increased by a large number of reinforcing members to suppress the deflection of the base at the time of placing concrete, thereby eliminating the need for a support member such as a shoring for supporting the base. A sufficient working area on the side opposite to the concrete placing surface can be ensured, and the concrete placing operation and various operations on the other side can be performed in parallel.

Here, as in the invention according to claim 3,
The dimensions of the base and the reinforcing members and the number of the reinforcing members installed,
The formwork composed of these bases and reinforcing members does not bend due to the weight of the concrete to be cast, can withstand the weight of suspended equipment and piping, and withstand fluctuations in load capacity after completion. Not only can prevent the deflection of the base during concrete casting, but also can withstand the suspended equipment and the weight of the piping, and Since it is possible to cope with the fluctuation of the withstand load, it is possible to easily cope particularly with the construction of a slab having a large span.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIGS. 1 to 3 show a first embodiment of a concrete casting formwork according to the present invention, which is applied when building a slab of a building. It was done. In FIG. 1, reference numeral 10 denotes a concrete casting formwork (hereinafter abbreviated as a formwork) according to the present embodiment. The formwork 10 includes a base 11 made of flat steel and an upper surface of the base 11, A concrete C, which will be described later, is placed on a surface (hereinafter, referred to as a concrete placing surface 11a) parallel to the concrete placing surface 11a at a predetermined interval, and integrally with the base 11 by welding. In the present embodiment, each of the reinforcing members 12 is formed of a long flat steel, and is welded to the base 11 at one side in the width direction thereof. Thus, the base 11 is integrally provided so as to be orthogonal to the base 11.

Each of the reinforcing members 12 has a large number of through-holes 12a formed in the thickness direction thereof at predetermined intervals in the length direction. The through holes 12a are formed so as to be coaxial with each other, and when the concrete C is cast, the concrete C fills each of the through holes 12a.

In order to construct a slab (S) using the formwork 10 according to the present embodiment configured as described above, first,
After the base 11 is installed so as to span between the beams of the building, as shown in FIG.
2, slab bars 13 are arranged thereon, and then concrete C is cast on the upper part of the base 11 as shown in FIG.
The slab S is constructed by curing and solidifying the concrete C.

In the slab S constructed in this manner, the base 11 is provided on the concrete casting surface 11a.
Since a large number of reinforcing members 12 are integrally attached to each other to increase the rigidity, the rigidity capable of supporting the weight of the concrete C to be cast can be secured, and as a result, the bending of the base 11 is suppressed. can do. Therefore, at the time of placing concrete C,
1, there is no need to install a support member such as a shoring, etc., so that a sufficient work area can be secured on the lower floor of the slab S. Can work. As a result, it is possible to reduce the amount of use of various materials such as support and the like, and to shorten the construction period.

On the other hand, after the cast concrete C is solidified, the concrete C fills the many through holes 12a of the reinforcing member 12, and the reinforcing members 1
2 and concrete C are mechanically connected, and as a result,
The base 11 is mechanically integrated with the concrete C via the plurality of reinforcing members 12, and the base 11 is firmly joined to the concrete C in combination with the adhesive force of the concrete C. Here, since the reinforcing member 12 is attached over the entire surface at a predetermined interval in the surface direction of the base 11, the base 11 and the concrete C
Are firmly joined over almost the entire surface of the base 11.

When it becomes necessary to suspend pipes, ducts or other equipment below the slab S, the lower surface of the base 11 corresponding to the installation positions of these equipment is shown in FIG. In this manner, the support 14 can be provided by hanging the support 14 directly by welding or the like, and attaching a device to the support 14.

Here, the base 11 is firmly joined to the concrete C over substantially the entire surface thereof through a large number of reinforcing members 12, so that the base 11 has a small weight relative to the weight of the installed equipment. Can be secured over almost the entire surface of the base 11, and as a result, the installation position of the device can be set at an arbitrary position on the base 11. Therefore, after the slab S is installed, it is possible to set the installation position of the above-mentioned equipment, and when the installation position of the equipment needs to be changed, the change position is limited. There is no change and free change is possible.

(Second Embodiment) FIGS. 4 and 5 show a second embodiment of the present invention. When the slab streaks 13 are installed, the lower slab streaks 13 are connected to the reinforcing members. It is characterized in that it is inserted into the through-hole 12a formed in the concrete 12, and by adopting such a configuration, it is possible to cope with the pre-assembly of the reinforcing bars, and to cope with the concrete C to be poured. The reinforcing member 12 is mechanically connected to the reinforcing member 12 via the slab bar 13, whereby the joining strength between the base 11 and the concrete C can be further increased, and various devices installed below the slab S , And the degree of freedom in setting and changing the installation position can be further increased.

It should be noted that various shapes, dimensions, and the like of each component shown in the above embodiment can be variously changed. For example, in the above embodiment, an example in which the present invention is applied to the construction of the slab S has been described. However, the present invention is also applicable to the construction of a wall, and the dimensions of the base 11 and the reinforcing members 12 and the number of the reinforcing members 12 to be installed. In consideration of the total weight of the concrete C to be cast and the weight of the equipment and pipes to be hung, the concrete C does not bend the formwork 10 and the weight of the equipment and pipe to be hung. By setting so as to be able to withstand and obtain rigidity that can cope with fluctuations in load resistance after completion, a slab S having a longer span can be constructed without support.

In place of the flat reinforcing member 12, the cross-sectional shape is L, as shown in FIGS.
, V-shaped, or trapezoidal reinforcing member 15.16.1.
7, and through holes 15a, 16a, 17a extending in the surface direction of the base 11 are formed in the reinforcing members 15, 16, 17 respectively.
Can be formed in advance. With such a configuration, when the concrete C and the base 11 move relative to each other in a direction away from each other, the reinforcing member 15
17 to the concrete C, the joint strength between the concrete C and the base 11 can be increased.

Further, although an example has been shown in which the base 11 is formed of a flat steel plate, the base 11 may be formed of a corrugated steel plate instead. Can be assembled in a lattice shape, whereby the rigidity of the base 11 itself or the entire formwork formed can be further increased.
Also, the through holes 12a formed in the reinforcing member 12 can be formed at any position where the slab streaks 13 are not inserted, such as in a staggered shape.

[0027]

As described above, according to any one of the first to third aspects of the present invention, the rigidity of the base is increased by a large number of reinforcing members integrally attached to the concrete casting surface of the base. The rigidity that can increase the weight of the concrete to be cast can be ensured, the deflection of the base can be suppressed, and a support member such as a shoring for supporting the base is not required when the concrete is poured. As a result, a sufficient working area can be secured on the side of the base opposite to the concrete casting surface, whereby various operations on the other surface can be performed in parallel with the concrete placing operation. In addition, the amount of materials used can be reduced, and the construction period can be shortened.

On the other hand, the concrete to be poured is filled in the many through holes of the reinforcing member, and the bonding strength between the reinforcing member and the concrete, that is, the bonding strength between the base and the concrete, is increased over almost the entire surface of the base. Therefore, when attaching pipes, ducts or other equipment to the slab, the supporting strength can be secured over almost the entire surface of the base body with respect to the weight of the equipment to be installed, As a result, the installation position of the device can be set to an arbitrary position on the base. Moreover, after the concrete is poured, it is also possible to set the installation position of the device, and even when it is necessary to change the installation position of the device, the change position is not limited, Free change is possible, and when installing the above equipment, there is no need to work such as cutting the base,
Equipment can be installed by a simple operation such as direct welding to the base.

Here, as in the invention according to claim 2,
By inserting a part of the reinforcing bar embedded in the concrete into the through hole formed in the reinforcing member, the joining strength between the base and the concrete is further increased, and the supporting strength of various devices attached to the base is increased. As well as being able to increase, it is also possible to achieve unitization by the pre-assembly of the reinforcing bars, and further, as in the invention according to claim 3, the dimensions of the base and the reinforcing member and the number of the reinforcing members to be installed are reduced. The formwork composed of these bases and reinforcing members does not bend due to the weight of the concrete to be cast, and can withstand the suspended equipment and the weight of the piping. By setting it to be able to handle the strength of concrete, it is possible to cast concrete with a longer span without support. It is obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a concrete casting formwork according to a first embodiment of the present invention.

FIG. 2 is a process diagram when a slab is constructed using a concrete casting formwork according to the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a slab constructed using the concrete casting formwork according to the first embodiment of the present invention.

FIG. 4 is an external perspective view showing a concrete casting formwork according to a second embodiment of the present invention.

FIG. 5 is a process chart at the time of slab construction using a concrete casting formwork according to a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional view of a slab constructed using a concrete casting formwork according to a second embodiment of the present invention.

FIG. 7 shows a modified example of the present invention, in which (a) to (c).
Is a longitudinal sectional view of a reinforcing member.

FIG. 8 is a longitudinal sectional view showing an example of a conventional concrete casting mold.

9 is a process chart at the time of slab construction using the concrete casting formwork shown in FIG. 8;

FIG. 10 is a longitudinal sectional view of a slab constructed using the concrete casting formwork shown in FIG. 8;

FIG. 11 is a vertical cross-sectional view showing a processing state of a base body performed when attaching various devices to a slab constructed using the concrete casting formwork shown in FIG.

FIG. 12 is a longitudinal sectional view showing a processing state of a base body performed when attaching various devices to a slab constructed using the concrete casting formwork shown in FIG. 8;

[Explanation of symbols]

 Reference Signs List 10 Formwork (for concrete casting) 11 Base 11a Concrete casting surface 12, 15, 16, 17 Reinforcement member 12a, 15a, 16a, 17a Through hole 13 Slab bar (rebar) 14 Support

Claims (3)

[Claims] 1. A formwork that is integrated with the concrete after casting and forms a part of the structure,
A base made of a steel plate, and a large number of reinforcing members that are welded to the concrete casting surface of the base at intervals in the plane direction and are embedded in the cast concrete, and these reinforcing members include: A concrete casting formwork comprising a plurality of through holes formed along the concrete casting surface of the base and filled with the concrete. 2. The concrete casting formwork according to claim 1, wherein a reinforcing bar is inserted through a through hole formed in the reinforcing member. 3. The dimensions of the base and the reinforcing member and the number of the reinforcing members installed are such that the formwork constituted by the base and the reinforcing member does not bend due to the weight of the concrete to be cast. 3. The concrete casting according to claim 1 or 2, wherein the concrete pouring is set so as to be able to withstand the suspended equipment and the weight of the pipe and to cope with fluctuations in the withstand load after completion. Formwork.