JP2022066106A - Reinforced concrete embedded plate - Google Patents

Abstract

To eliminate step processing or the like after concrete casting in a step of installing a reinforced concrete embedded plate so as to increase efficiency of work, save manpower, and improve the quality.SOLUTION: Provided is a reinforced concrete embedded plate 10 including a steel plate 11 installed to be embedded in concrete with a stud dowel 12. The steel plate 11 is attached to a horizontally bridging rod 40 held on a reinforcement 2 via a plurality of plate support bolts 20 each having one end screwed into an attachment screw hole 13 in a peripheral part, and via a bolt receiving member 30 screwed into the other end of the plate support bolt 20. The plate support bolt 20 has an end surface formed with a flathead screw groove 22. A screwing range in the attachment screw hole 13 is for a left screw, and a screwing range in the bolt receiving member 30 is for a right screw. Rotation operation of the screw allows for adjustment of enter and exit of the steel plate 11.SELECTED DRAWING: Figure 1

Description

The present invention relates to a reinforced concrete embedded plate, and relates to a reinforced concrete embedded plate capable of efficiently attaching a steel plate or the like having an anchor member to a floor surface or a wall surface of a reinforced concrete structure and adjusting the mounting position thereof.

A large number of various equipment and pipes are installed in buildings such as power plant plant facilities, but these equipment and pipes need to be firmly installed in the building frame due to seismic design. For this reason, a large number of steel plate embedded plates of various dimensions for mounting equipment foundations and piping racks are embedded in predetermined positions on the surface of the concrete frame, and the foundations and piping racks are welded to these embedded plates. It is designed to be fixed. Therefore, it is necessary to install a large number of embedded plates and a large number of anchor members such as anchor bolts in the concrete skeleton. A unit structure has also been proposed for the purpose of efficiently performing the work and shortening the work process (Patent Document 1).

The unit structure disclosed in Patent Document 1 has a plurality of anchor bolts for installing a large machine foundation on a concrete skeleton, and anchor bolts are attached using a template for positioning in a predetermined position. It consists of a unit consisting of a support and a plate. By manufacturing this unit at the factory, bringing it to the site, and installing it accurately at the anchor bolt installation position, it is possible to reduce the man-hours of workers at the installation site and shorten the installation period of the equipment foundation.

Japanese Unexamined Patent Publication No. 2011-74632

Since the unit disclosed in Patent Document 1 holds a plurality of anchor bolts for a large machine foundation, the overall dimensions are large, and it is necessary to construct a frame for supporting the unit between the reinforcing bars in the formwork. It has a complicated structure.
On the other hand, since the embedded plate for which the piping rack or the like is fixedly held is relatively lightweight and small, a plurality of welding clamps are attached to the reinforcing bars arranged in the formwork to grip the vise or the like. After temporarily fixing to a square pipe for temporary fixing via the above, adjusting the mounting position and level, and then welding and fixing to the welding clamp by a welder. For this reason, in the work of installing the embedded plate, it is necessary to thoroughly manage the use of fire such as spark curing and arrangement of fire extinguishing equipment.

In addition, after the embedded plate is welded and fixed, the entrance / exit adjustment of the embedded plate with respect to the concrete surface (the height (position) adjustment for eliminating the step on the embedded plate surface with respect to the concrete surface is hereinafter referred to as the entrance / exit adjustment). Therefore, after placing the concrete, additional work such as cleaning work on the concrete surface and step treatment work on the concrete surface by plastering work is required, which causes problems in terms of work efficiency and quality.

Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional techniques, to fix and hold the embedded plate to the reinforcing bars arranged in the formwork without welding or the like, and to move the plate surface in and out. It is an object of the present invention to provide a reinforced concrete embedded plate that can be easily and accurately adjusted.

The present invention is a reinforced concrete embedded plate having a steel plate plate embedded and installed in reinforced concrete together with an anchor member mounted on the back surface, and the steel plate plate is screwed at one end into a mounting screw hole at a peripheral portion. It is attached to a horizontal member held on the skeleton reinforcing bar via a plurality of screw members and a support member screwed to the other end of the screw member, and the steel plate plate is moved in and out by the rotational operation of the screw member. It is characterized by being adjustable.

It is preferable that the screw member has a rotation imparting portion formed on the end surface, the screwing range in the mounting screw hole is a left-handed screw, and the screwing range in the support member is a right-handed screw.

The support member preferably includes a coupling nut that is screwed into the screw member.

The support member preferably includes a pipe portion that can be inserted into the horizontal member.

The rotation imparting portion is preferably a minus screw-shaped square groove formed on the end face of the screw member.

According to the present invention, a steel plate can be installed on the floor or wall surface of a reinforced concrete structure by a single multi-skilled worker without using welding, and the entrance and exit can be easily adjusted after installation. It is possible to eliminate step processing and cleaning work after installation, and it is possible to improve work efficiency, labor saving, and quality.

The perspective view which showed the state which attached the reinforced concrete embedding plate of this invention to the reinforcing bar in a floor slab formwork. A side sectional view showing the reinforced concrete embedded plate of the present invention along the II-II sectional line of FIG. The perspective view which showed two examples of embodiment of a bolt receiving member. A partially enlarged cross-sectional view showing an enlarged state in which a steel plate is supported by a plate support bolt and a bolt receiving member. Explanatory drawing which showed the entrance / exit adjustment state of a steel plate. A perspective view showing a state in which a reinforced concrete embedded plate is attached to a reinforcing bar on a wall surface.

Hereinafter, the configuration, mounting state, and entry / exit adjustment state of one embodiment of the reinforced concrete embedded plate of the present invention will be described with reference to the attached drawings.

FIGS. 1 and 2 show an embodiment of a reinforced concrete embedded plate 10 mounted on a reinforcing bar 2 arranged in a floor slab formwork (not shown). The reinforced concrete embedded plate 10 of the present embodiment includes a steel plate plate 11, four plate support bolts 20 having upper ends screwed to the four corners of the steel plate plate 11, and long nuts screwed to the lower part of the plate support bolt 20. It is composed of a bolt receiving member 30 having a pipe portion 32 that is integrally connected to the portion 31 and the long nut portion 31 and is inserted and supported by a horizontal rod 40 that is placed and fixed on a reinforcing bar.

In the present embodiment, the steel plate plate 11 is made of an SS material having a side of 200 mm and a thickness of 16 mm as an example, and four stud gibber 12s are attached to the plate lower surface 11b by stud welding at equal intervals from each other. As shown in FIG. 1, mounting screw holes 13 for plate support bolts 20, which will be described later, are formed at the four corners of the steel plate plate 11. The inner peripheral surface of the mounting screw hole 13 is internally threaded with a left-hand thread (reverse screw) (FIG. 4), and the left-hand threaded portion 20a on the upper portion of the left-threaded plate support bolt 20 can be screwed. It has become like. Further, an air hole 14 at the time of placing concrete is formed in the center of the plate so that the concrete placed below the steel plate plate 11 spreads over the entire surface of the lower surface 11b of the plate.

As shown in FIGS. 2 and 4 (enlarged view), the plate support bolt 20 is a full-threaded bolt having a peripheral surface threaded over its entire length. The range of about 1/3 from the upper end of the bolt is the left-hand thread portion 20a on which the left-hand thread (reverse screw) is formed, and the remaining lower range is the right-hand thread portion 20b on which the right-hand thread (positive thread) is formed. It has become. The upper left-hand thread portion 20a is screwed into the mounting screw hole 13 of the steel plate plate 11, and the lower right-hand thread portion 20b is screwed into the long nut portion 31 of the bolt receiving member 30. On the upper end surface of the plate support bolt 20, a minus screw-shaped narrow groove 22 that crosses the central position is formed. The narrow groove 22 is formed to rotate the plate support bolt 20 in the screw direction using a rotary tool such as a flat-blade screwdriver (not shown). In this embodiment, all screw bolts (M10) are used as the plate support bolts 20, but the number and diameter of the bolts are such that the steel plate plate 11 is reliably temporarily supported by the reinforcing bars 2 (FIG. 1) according to the size of the steel plate plate 11. Needless to say, the required number and diameter can be set.

As shown in FIG. 3A, the bolt receiving member 30 of the present embodiment has a long nut portion 31 that can be screwed into the plate support bolt 20 and a long nut portion that is perpendicular to the axial direction of the long nut portion 31. It is composed of a pipe portion 32 welded to the lower side surface of the portion 31. In the present embodiment, the long nut portion 31 is a normal hexagon nut having a length (thickness) of 30 mm, and the pipe portion 32 is a circular steel pipe (STK material) having an inner diameter of φ15 mm and a length of 25 mm. For the pipe portion 32, a steel pipe having an inner diameter slightly larger than the outer diameter of the horizontal rod 40 used may be used.

In FIG. 3B, the locking plate 33 is welded instead of the pipe portion 32, and the horizontal rod 40 is locked in the notch 33a of the locking plate 33 so that the bolt receiving member 30 is held by the reinforcing bar 2. An example of the modification is shown. When this locking plate 33 is used, in addition to the method of binding the locking plate 33 to the horizontal rod 40 in advance and attaching the bolt receiving member 30 to the reinforcing bar 2 as in the case of the pipe portion 32, the locking plate 33 is arranged in the formwork. It is also possible to attach the bolt receiving member 30 to the horizontal rod 40 by fitting the notch 33a of the locking plate 33 into the horizontal rod 40 fixed on the reinforced reinforcing bar 2.

The horizontal rod 40 is a support member through which the pipe portion 32 is inserted and the reinforced concrete embedded plate 10 is placed on the reinforcing bar 2 and temporarily fixed. However, in the present embodiment, the deformed reinforcing bar (D13) is used. ing. The length L is set to be at least twice the pitch (separation) of the reinforcing bar 2 so that it can be stably placed on the reinforcing bar 2. For example, when the reinforcing bars 2 are arranged at @ 200 mm, it is preferable to set L = 700 mm. In addition to various deformed reinforcing bars, various materials such as round steel can be used for the horizontal rod 40 as long as the pipe portion 32 is a member that can be easily inserted.

The mounting method of the reinforced concrete embedded plate 10 described above will be described with reference to FIGS. 1, 2, and 4. As shown in FIG. 2, it is necessary to set the upper surface of the reinforced concrete embedded plate 10 at a position (level) flush with the surface S of the concrete to be cast later. Therefore, the screwing position of the long nut portion 31 of the bolt receiving member 30 to the plate support bolt 20 is adjusted in advance, and the distance between the upper end of the reinforcing bar 1 having a small covering and the upper surface 11a of the steel plate plate 11 is the covering of the reinforcing bar 1 having a small covering. Adjust so that it is equal to D. At this time, the head of the plate support bolt 20 is set at a position about half the thickness of the steel plate plate 11 in the mounting screw hole 13 as shown in FIG. 4 for the adjustment of the entrance and exit of the steel plate plate 11 to be performed later. It is preferable to keep it. The pipe portion 32 of the two bolt receiving members 30 screwed to each of the four plate support bolts 20 is inserted into each of the two horizontal rods 40 arranged in parallel, and the reinforced concrete embedded plate 10 is inserted. Make it a unit. The unitized reinforced concrete embedded plate 10 is attached to a set arrangement position in a formwork (not shown) and temporarily fixed. In this temporary fixing work, the horizontal rod 40 attached to the reinforced concrete embedded plate 10 is attached to three reinforcing bars 2 of the large-covered reinforcing bars 2 of the reinforcing bars 1 and 2 arranged vertically and horizontally in the formwork. They are placed on the reinforcing bars 2 so as to be orthogonal to each other, and the intersecting portions of the placed reinforcing bars 2 and the horizontal rod 40 are tied together by a binding wire 45.

FIG. 5 shows the working state of the entrance / exit adjustment of the steel plate plate 11 of the reinforced concrete embedded plate 10. FIG. 5A shows a state immediately after the reinforced concrete embedded plate 10 is installed at a predetermined position in a formwork (not shown). In this state, the level of the upper surface 11a of the steel plate plate 11 is checked to confirm the installation error with the set height. The entrance / exit adjustment of the steel plate plate 11 is performed by the plate support bolt 20 according to the level difference (installation error) from the temporarily fixed level of the steel plate plate 11 at that time. A flat-screw-shaped narrow groove 22 is formed in the head of the plate support bolt 20 in the mounting screw hole 13 of the steel plate plate 11. Since the left-hand thread portion 21a is located in the mounting screw hole 13 of the steel plate plate 11 and the right-hand thread portion 21b is located in the long nut of the bolt receiving member 30, the plate support bolt 20 is located at the upper end of the plate support bolt 20. When the narrow groove 22 is rotated clockwise (clockwise) or counterclockwise (counterclockwise) with a rotating tool such as a flat-blade screwdriver, the steel plate plate 11 can freely move up and down according to the screw rotation, while the long nut portion 31 itself. Is fixedly held to the horizontal rod 40 so as not to rotate. Therefore, when the screw is rotated counterclockwise, the steel plate plate 11 can be raised by a feed amount twice the normal screw feed amount according to the screw rotation (FIG. 5 (b)). On the contrary, when it is rotated clockwise (clockwise), the steel plate plate 11 can be lowered by a feed amount twice the normal screw feed amount according to the screw rotation (FIG. 5 (c)).

In the present embodiment, four plate support bolts 20 are attached to the four corners of the steel plate plate 11, and the four plate support bolts 20 are appropriately moved in and out to maintain the horizontality of the steel plate plate 11. You can adjust the entrance and exit (level adjustment).

FIG. 6 shows an embodiment in which the reinforced concrete embedded plate 10 is arranged on the wall surface. In this embodiment, a suspension rod 41 corresponding to the horizontal rod 40 arranged on the floor is used. The suspension rod 41 is bent into an inverted J shape so that the upper end thereof is the hook portion 41a. The hook portion 41a of the suspension rod 41 is hung on the horizontal bar 3 of the vertical and horizontal reinforcing bars arranged in the wall formwork (not shown) and fastened to the horizontal bar 3 with a binding wire 45 or the like to connect the reinforced concrete embedded plate 10 to the predetermined wall surface. It can be temporarily fixed in position. At this time, in order to hold the position of the suspended steel plate plate 11 with the suspension rod 41, it is necessary to fasten the pipe portion 32 of the bolt receiving member 30 to the suspension rod 41 with a binding wire 46 or various stoppers. .. Also in this case, it is possible to adjust the entrance / exit to the concrete wall surface by using the support bolt 20 screwed into the mounting screw hole 13 of the steel plate plate 11.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of each claim. That is, an embodiment obtained by combining technical means appropriately modified within the scope of the claims is also included in the technical scope of the present invention.

2 Reinforcing bar 10 Reinforced concrete embedded plate 11 Steel plate plate 13 Mounting screw hole 20 Plate support bolt 20a Left screw part 20b Right thread part 30 Bolt receiving member 31 Long nut 32 Pipe part 40 Horizontal rod

Claims (5)

A reinforced concrete embedded plate having a steel plate that is embedded and installed in reinforced concrete together with an anchor member attached to the back surface.
The steel plate is a horizontal frame held on a skeleton rebar via a plurality of screw members whose one end is screwed into a mounting screw hole at a peripheral portion and a support member screwed to the other end of the screw member. Attached to the material,
A reinforced concrete embedded plate characterized in that the entrance / exit of the steel plate plate can be adjusted by the rotational operation of the screw member. The screw member has a rotation imparting portion formed on an end face thereof, and the screwing range in the mounting screw hole is a left-handed screw, and the screwing range in the support member is a right-handed screw. Reinforced concrete embedded plate as described. The reinforced concrete embedded plate according to claim 1 or 2, wherein the support member includes a long nut screwed into the screw member. The reinforced concrete embedded plate according to claim 1 or 2, wherein the support member includes a pipe portion that can be inserted into the horizontal member. The reinforced concrete embedded plate according to claim 2, wherein the rotation imparting portion is a minus screw-shaped square groove formed on the end surface of the screw member.

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