JPS59224770A - Wire arranging and assembling method of underground beam - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a reinforcing assembly method for underground beams.

Conventionally, reinforcing for underground beams is done by placing a pre-assembled body between the column steel frames, which is made up of three-dimensional pre-assembled beam main reinforcements and stirrups.
At the column and beam joints, the main beam reinforcements that intersect with the column steel are placed one by one, and after connecting them to the main beam reinforcements of the pre-assembled body,
The method of winding and fixing the stirrup at the joint, or arranging each main reinforcing bar one by one at the site and winding and fixing the stirrup, is inconvenient due to high tension and transportation. be.

Also, it is necessary to joint both ends of the pre-assembled body between each span, which has the disadvantage of requiring a large number of joints.
A temporary material is required to support the pre-assembled body at a certain height above the top of the waste concrete. on the other hand,
Although the latter method does not have such disadvantages in terms of transportation, etc., it is inefficient because the main reinforcing bars must be arranged one by one on site, and moreover, the upper main reinforcing bars must be raised to a fixed height. This poses a problem in terms of workability, as scaffolding must be erected with the help of several dogs.

Therefore, the present invention is a novel method that can wipe out the drawbacks of the above-mentioned conventional methods, such as being easy to work with on-site, convenient to transport and transport, and greatly eliminating the need for scaffolding and other temporary construction materials. The present invention provides a method.

That is, in the underground beam reinforcement assembly method according to the present invention, the main reinforcement of the underground beam is assembled into a pair of planar pre-assembled bodies that are divided into two in the beam width direction, while the column steel In this step, arm rods protruding from both sides of the column steel frame are fixed, and the pre-assembled bodies are arranged to be hugged from both sides of the column steel frame, and each of the pre-assembled bodies is suspended and supported by the arm rod, The gist of this method is to connect the main reinforcements of both pre-assembled bodies and the main reinforcements of the pre-assembled bodies adjacent in the length direction of the beam at the mid-span section, and then wrap and fix stirrups around these pre-assembled bodies. There is.

Next, embodiments of the method of the present invention will be described based on the drawings. First, as shown in Figure 1, part A corresponds to the left and right sides of the main beam reinforcement.
, B are preassembled in a plane. In this pre-assembly, a jig 2 is used to connect the main reinforcements ta, tb, . . . 1f while keeping them at predetermined intervals. As shown in Fig. 2, this jig 2 has Z holes 3, 3 into which the upper end main reinforcements 1a, lb are inserted, receivers 4, 4 into which the two-step reinforcements and lower end main reinforcements ld, If are placed, and each hole and receiver. It consists of a joint arm 5 that maintains a predetermined spacing.

Next, the left and right side bodies A were assembled in this way.

B (hereinafter referred to as a pre-assembled body) are provided so as to hug each other from both sides of the column steel frame 60, as shown in FIGS. 3(a) and 3(H). In this case, the column steel frame 6 should be placed at an appropriate height on the column steel frame 6 in advance.
Attach the arm rods 7゜7 that protrude from both sides in the width direction of the beam, and attach the pre-assembled body A to the arm rods 7, 7.

It is assumed that the upper end main reinforcement 1a of B is hooked and suspended for support.

Then, the main reinforcements of the double-end assembled bodies A and B and the main reinforcements of the front assembled bodies A' and B', which have the same shape and are arranged in the same manner and are adjacent to each other in the beam length direction, are connected to the middle part of the span. At this step, PC joints such as pressure welding single lap joints are made.

After that, these pre-assembled bodies A, B, A, 1
Stirrup 8 is wound and fixed around 3', and reinforcement of the underground beam is completed. In addition, when using a rectangular spiral hoop muscle as the stirrup 8, the pre-assembled body A
, B are suspended and supported by the arm rods 7, 7, the spiral hoop muscles in the contracted state are fitted and locked in the pre-assembled bodies A, B, and the adjacent pre-assembled bodies N, B' After joining with
Just stretch the spiral hoop reinforcement and fix it to the main reinforcement with wire, etc.

As explained above, the underground beam reinforcement assembly method according to the present invention has the following effects.

■ Since the pre-assembled body is flat, corresponding to the left and right sides of the main beam reinforcement, it is not bulky and is extremely convenient to transport and transport.

■ Since the two pre-assembled bodies are placed together on the steel column and suspended and supported by arm rods fixed to the steel column, there is no need to set up scaffolding on site, making on-site work extremely easy.

■ Since the pre-assembled body is installed and reinforced so that it intersects with the column steel frame, the main reinforcements of the pre-assembled body only need to be connected between each span, reducing the number of connections.

[Brief explanation of the drawing]

The drawings show one embodiment of the method of the present invention, in which Fig. 1 is a perspective view of a pre-assembled body, Fig. 2 is a perspective view of a jig, and Fig. 3 (a) (1)) shows a pre-assembled body installed on a column steel frame. A front view and a side view showing the state, and FIG. 4 is a diagram showing a state in which a stirrup is wound around the pre-assembled body having reinforcement as shown in FIG. A, B... pre-assembled body, ia, ib... main reinforcement, 6...
・Column steel frame, 7...arm rod. 1f Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] The main reinforcement of the underground beam is assembled into a pair of planar pre-assembled bodies that are divided into two parts in the width direction of the beam, while arm rods protruding from both sides of the column steel frame are fixed to the column steel frame. The pre-assembled bodies are placed in a state where they are hugged from both sides by the column steel frame, each of the pre-assembled bodies is suspended and supported by the arm rod, and the main reinforcement of both of these pre-assembled bodies and the beam length direction are arranged. A method for assembling reinforcing for underground beams, which comprises joining the main reinforcements of adjacent pre-assembled bodies at mid-spans, and then winding and fixing stirrups around these pre-assembled bodies.