JPH042736B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention provides an anchor bolt that is devised to eliminate problems caused by the anchor fixing plate when fixing the anchor bolt having the anchor fixing plate inside the beam reinforcement etc. Regarding the installation method.

(b) Background of the technology An anchor bolt used for installing equipment at nuclear power plants, etc. is usually fixed with an anchor fixing plate of around 300 mm in diameter to enhance the fixing effect. Furthermore, extremely high positional accuracy of the anchor bolt is required. For this reason, when anchor bolts are anchored inside beam reinforcements, interference occurs particularly with the position of reinforcement work, which causes various problems in terms of strength, reinforcement quality, process, etc. However, these problems cannot be solved. There is a strong desire to be able to successfully attach anchor bolts to beam reinforcements and the like.

(c) Conventional technology and problems As shown in Figure 4, the method of installing anchor bolts with anchor fixing plates fixed inside reinforcing bars of beams, etc. is to install a formwork at the lower end of the beam (step S1),
Then, the main reinforcement at the lower end of the beam (the lower reinforcing bar among the beam reinforcements) and the lower stirrup (b ₁ in Figure 5) are arranged, and the main reinforcements are pressed together (step S2), and the main reinforcement at the upper end of the beam (the lower reinforcement among the beam reinforcements) is placed. Attach the support frame for the upper reinforcing bars (step S3), arrange the main reinforcement at the upper end of the beam and the upper stirrup (see a and b ₂ in Figure 5), and connect the main reinforcement by pressure welding, etc. (step S4), and attach the upper end of the beam. Assemble a special frame for fixing anchor bolts (see c in Fig. 5) above the main reinforcement and stirrups (step S5), measure the position of the anchor bolts (step S6), and when the anchor bolts are inserted in that position, The main reinforcement at the top of the beam that would interfere with the anchor bolt is cut (step S7), and the anchor bolt (see d ₁ and d ₂ in Figure 5) is inserted into the beam through the insertion space formed in the main reinforcement at the top of the beam. After fixing the anchor bolt to the already erected anchor bolt fixing frame c (step S8), and repairing the cut beam upper end main reinforcement with lap joints, (step S8)
9) Place concrete (step S10)
It forms a beam.

As mentioned above, when the main reinforcement a at the top of the beam is arranged, in order to insert the anchor bolt _d1 into the main reinforcement a at the top of the beam, it is essential to cut the main reinforcement a at the top of the beam, which is shown by hatching in Fig. 5, as described above. becomes. As mentioned above, the means to repair this cut is to reinforce the main reinforcement at the upper end of the beam over several stages with overlap joints.
Not only is the strength and reinforcement quality inferior, but the work is extremely difficult, resulting in a large loss in time and process.

In order to avoid this, if you try to fix the anchor bolt to a frame dedicated to fixing anchor bolts before arranging the main reinforcement at the top of the beam, you will not be able to arrange the main reinforcement at the top of the beam.

(iv) Purpose of the Invention The present invention was invented to solve the above-mentioned technical problem, and its purpose is to remove the reinforcing steel inside the reinforcing structure without cutting the reinforcing bars existing in the area where the anchor bolt is inserted. It is an object of the present invention to provide a method for attaching an anchor bolt, which solves the above-mentioned technical problem by allowing the anchor bolt to be attached.

(E) Structure of the Invention In order to achieve this object, the construction method of the present invention is a construction method for attaching an anchor bolt with an anchor fixing plate fixed inside the reinforcing structure of a structure in which a plurality of reinforcing bars are arranged three-dimensionally. Install a receiving frame, temporarily fix the anchor bolt to the anchor bolt receiving frame, arrange the reinforcing bars that make up the reinforcing bar structure avoiding the anchor bolts, and after completing the assembly of the joints of the main bars and the auxiliary bars, A frame exclusively for fixing anchor bolts is installed above the reinforcing steel structure, and the temporarily fixed anchor bolts are permanently fixed to the frame exclusively for fixing anchor bolts.

(F) Embodiments of the invention Examples of the invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of the anchor bolt 1 fixed to the anchor fixing plate 1A installed inside the beam reinforcement by the installation method of the present invention. 2
3 is the main reinforcement at the lower end of the beam, 3 is the stirrup, and 4 is the main reinforcement at the upper end of the beam, and these constitute the beam reinforcement. 5 is a beam upper end main reinforcement support frame. Reference numeral 6 denotes an anchor bolt temporary support frame, which is a beam upper end main reinforcement support construction truss that is fixed to the beam upper end main reinforcement support frame 5 (in the case of unsupported construction method, a construction truss that supports the hanging formwork may be built-in). ) 7. An arm 8 fixed to the truss 7;
The support material 9 fixed to the beam upper end main bar support frame 5
(See also FIG. 2). In addition, when attaching the anchor bolt 1 inside the beam reinforcement, in the present invention, as in the conventional case (see FIG. 5), a frame exclusively for fixing the anchor bolt (c in FIG. 5) is assembled above the main reinforcement 4 at the upper end of the beam. However, in order to maintain the clarity of the drawing, and because it is thought that its absence will not impede understanding of the invention, the frame dedicated to anchor bolt fixing is not shown in Figure 1. .

As shown in FIG. 1, the process of attaching the anchor bolt 1 inside the beam reinforcement is as follows. During this process, the steps up to the installation of the beam upper end main reinforcement support pedestal 5 are the same as in the conventional construction method (see steps S1 to S3 in FIGS. 1 and 3).

After installing the beam upper end main reinforcement support frame 5, the anchor bolt temporary support frame 6 is attached to the beam upper end main reinforcement support frame 5 (step S20 in Fig. 3), and the anchor bolt 1 is attached to the anchor bolt temporary support frame 6. It is fixed (step S21 in FIG. 3).
In this temporary fixing process, one end of the anchor bolt 1 on which the anchor bolt fixing plate 1A is fixed is placed on the receiving material 8, and it can be slid toward the other end of the anchor bolt 1 in its length direction. The construction is carried out by temporarily welding the member 1C protruding from the double pipe 1B fitted to the collapse prevention material 10 (see Fig. 2).

After that, the beam upper end main reinforcement 4 and stirrup 3 are arranged so as to avoid the anchor bolt 1 which is temporarily fixed and installed, and the main reinforcement 4 is jointed (third
Step S22 in the figure).

After assembling a frame exclusively for fixing anchor bolts (similar to c in Fig. 5) above the beam upper end reinforcing structure thus formed (step S23 in Fig. 3),
The anchor bolt 1 is permanently fixed to the frame exclusively for fixing the anchor bolt by bolt tightening or the like (see the left part in FIG. 5, step S24 in FIG. 3).

In this way, the anchor bolt 1 having the anchor fixing plate 1A is installed inside the beam reinforcement as shown in Fig. 1, and after surrounding the reinforcing structure with the required partition plates, concrete is poured (Fig. 3). Step S25) Forming beams.

In the above embodiment, the anchor bolt is attached to a beam, but the present invention can be applied to other locations such as the floor. Also, pedestal 6
If necessary, the truss may be used as a permanent truss in cases such as steel reinforced concrete construction.

(G) Effects of the Invention As is clear from the above explanation, according to the present invention, there is no need to cut the reinforcing bars, the strength and reinforcement quality are improved, and the process is simplified. Effects such as improved work efficiency can be obtained.

[Brief explanation of drawings]

Figure 1 is a perspective view of the reinforcing steel structure with anchor bolts installed inside the main reinforcement at the upper end of the beam using the construction method of the present invention, Figure 2 is a partially enlarged view of the anchor bolt attachment part in Figure 1, and Figure 3 4 is a diagram showing the process of the present invention, FIG. 4 is a diagram showing the process of the conventional construction method, and FIG. 5 is a diagram for explaining the drawbacks of the conventional construction method. In the figure, 1 is the anchor bolt, 2 is the main reinforcement at the lower end of the beam,
3 is a stirrup, 4 is a beam upper end main reinforcement, 5 is a beam upper end main reinforcement support frame, 6 is an anchor bolt temporary support frame,
c is a stand exclusively for fixing anchor bolts.

Claims (1)

[Claims] 1. A construction method for installing an anchor bolt with an anchor fixing plate fixed inside the reinforcing bars of a reinforced concrete structure consisting of a plurality of reinforcing bars arranged three-dimensionally or a steel-framed reinforced concrete structure, in which an anchor bolt receiving frame is installed. , temporarily fix the anchor bolt to the anchor bolt receiving frame, arrange the reinforcing bars that make up the reinforcing bar structure avoiding the anchor bolt, and after completing the assembly of the joints of the main bars and the auxiliary bars, place the reinforcing bars above the reinforcing bar structure. An anchor bolt installation method comprising: installing a frame exclusively for fixing anchor bolts, and permanently fixing the temporarily fixed anchor bolts to the frame exclusively for fixing anchor bolts. 2. The anchor bolt installation method according to claim 1, wherein the joint of the main reinforcement is a pressure weld or a mechanical joint.