JPH0572482B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a method for assembling reinforcing bars for underground beams.

[Prior art]

When constructing underground beams, it may not be possible to concrete the large underground beams at the same time, and it may be desirable to perform concrete pouring for the beam and slab separately.
Therefore, an invention described in Jikai No. 63-51529 has been disclosed as a construction method in which beam reinforcing bars are constructed in sequence by assembling them as concrete is poured.

[Problems to be solved by this invention]

In the method described above, in which the beam reinforcing bars are assembled sequentially,
In order to support the upper main reinforcement, a temporary T-shaped reinforcing bar support frame was placed below the upper main reinforcement, but once the reinforcing bars were assembled, this reinforcing bar support frame could not be removed, so it was buried in concrete. There are many things that must be done. Therefore, the construction cost increased accordingly.

This invention has solved the above-mentioned problems, and aims to provide a method for assembling reinforcing bars for underground beams that can be easily and inexpensively constructed.

[Means to solve the problem]

The method for assembling reinforcing bars for underground beams according to the present invention is to arrange meshed lower ribs on the ground, arrange a plurality of lower main reinforcements on top of the lower ribs, and arrange the ends of the lower ribs as appropriate on the left and right. Pressure platen concrete will be placed at intervals so as to protrude upward. Support frames are arranged on both sides of the underground beam position on this pressure platen, and a plurality of upper main reinforcing bars are arranged on the receiving material stretched over the support frames to support it. The upper ribs are meshed and bent into a portal shape on top of the upper main muscles, and the upper ribs are connected to the upper main muscles, and the upper and lower ribs are overlapped and connected. After attaching the restraining bars bent in the shape of a shape and removing the support frame and receiving materials, formwork is placed on the left and right sides of the reinforcing bars, and concrete is poured.

〔Example〕

Hereinafter, the present invention will be explained in detail based on an embodiment shown in the drawings.

<1> Construction of a pressure platen (Fig. 1) In the figure, 1 is a piece of concrete poured on the ground, and the bottom reinforcement 2 of the pressure platen is placed on this piece of concrete 1.

The lower ribs 3 are placed on top of this. The lower reinforcing bars 3 are made of a mesh of multiple reinforcing bars, that is, welded into a lattice structure in advance.
As shown in the figure, one bent in a U-shape may also be used. A plurality of lower main reinforcements 4 are arranged on the lower ribs 3 with appropriate intervals.

A pressure plate upper end reinforcement 5 is arranged in parallel slightly above the pressure plate lower end reinforcement 2 described above.

Pressure plate concrete 6 is cast to bury the pressure plate upper and lower end reinforcements 2 and 5, the lower main reinforcements 4, and the lower parts of the lower reinforcement bars 3. The ends of the lower ribs 3 protrude slightly from the upper surface of the concrete 6.

As the lower ribs 3, other figures 10 to 1
The one shown in Figure 3 will be adopted.

Figure 10 shows a case where the pressure board is thick, and the lower ribs are formed by a mesh-shaped reinforcement 7 bent in a U-shape and mesh-shaped reinforcements 8, 8 stacked on both ends of the mesh reinforcement and raised upward. This is what constitutes muscle 3. Before installing the mesh-like reinforcements 8, 8, the lower main reinforcements 4, 4 are arranged.

Figure 11 shows the case where one side of the underground beam is secured. A U-shaped mesh muscle 9 with a larger bent portion on one side is arranged with the longer bent portion on the mountain side. After placing the lower main reinforcements 4, 4,
The mesh-like stripes 8 are stacked on the short end side and stand upwardly. The mesh muscles 8 and 9 constitute the lower costal muscles 3.

Figures 12 and 13 show the case where the pressure platen heights are different on the left and right sides of the underground beam. 12th
In the figure, a U-shaped mesh muscle 9 with a larger bent portion on one side is arranged with the longer bent portion lowered. After the lower main reinforcements 4, 4 are arranged, mesh-like reinforcements 8 are stacked and raised on the short end side. These mesh-like muscles 8 and 9 constitute the lower costal muscles 3. In FIG. 13, mesh-like muscles 7 are bent in a U-shape, mesh-like muscles 8, 8 are overlapped on both ends of the mesh-like muscles 7, and mesh-like muscles 10, 1 are overlapped on mesh-like muscles 8, 8.
It is a stack of 0's that stands up.

<2> Reinforcement arrangement of upper main reinforcement (Fig. 2) On the pressure board constructed as above, support frames 11, 11 are placed on both sides of the underground beam of the lower reinforcement 3. A receiving material 12 is placed over these support frames 11, 11. Upper main reinforcement 1 of underground beam on support material 12
Place multiple pieces of 3.

<3> Reinforcement arrangement of the upper ribs (Fig. 3) The upper ribs 14 are arranged so as to cover the upper main reinforcements 13 installed as described above. Upper rib muscle 14
This is a mesh-shaped reinforcing bar bent into a gate shape, and is placed on the upper main reinforcing bar 13 so that both ends thereof fall downward.

The overlapping parts of the protruding part of the lower rib 3 from the pressure board and both ends of the upper rib 14 are connected with a binding wire. Furthermore, in this overlapping part, restraining muscles 15, 15 are formed by bending mesh-like muscles into a U-shape.
Install from the left and right sides. The restraining bars 15 may be hooked to the horizontal reinforcing bars of the upper ribs 14, as shown in FIG. 7, or may be hooked to the horizontal reinforcing bars of the lower ribs 3, as shown in FIG. .

The joints on the sides of the ribs will be lap joints without hooks, but the concrete cover thickness will be 4 cm to 7 cm.
Since the length of the concrete is approximately 1.5 cm, restraining bars are used to prevent cracking of the concrete and subsequent peeling of the concrete, as well as to prevent a decrease in the adhesion of the ribs. This prevents the internal concrete surrounded by the ribs from bursting outward. In addition, if necessary, weld one auxiliary bar at the end of the rib in the direction perpendicular to the rib, and wait for the adhesion between the concrete and the rib and the effect of the auxiliary bar on the concrete. You can also

A horizontal width stop bar 1 is installed between both ends of the upper cost bar 14.
Connect by 6.

Further, as shown in FIG. 4, the consecutively adjacent upper ribs 14 are connected by a support bar 17.

The upper main reinforcement 13 and the upper cost reinforcement 14 are connected with a binding wire or by welding. This allows the upper main reinforcement 13 to be supported by the ribs 3 and 14.

<4> Formwork (Fig. 5) Remove the supporting frames 11, 11 and the receiving material 12.

Assemble formwork on the left and right sides of the reinforcing bars for the underground beams assembled as described above. Slab formworks 19, 19 are assembled horizontally from the upper ends of the underground beam formworks 18, 18.

<5> Concrete pouring Concrete is poured between the formworks 18 and 18 assembled as described above and on the slab formwork 19 to construct the underground beam and slab at the same time.

〔Effect of the invention〕

This invention has the above-mentioned configuration, and the upper main reinforcement is supported and positioned by the support pedestals and receiving materials placed on both sides of the underground beam position, and the support pedestals can be removed and reused without being buried in the concrete. It is versatile in use and inexpensive to construct. In addition, since a U-shaped restraining muscle is attached to the overlapping joint between the upper and lower ribs, the strength of the joint can be expected to increase.

[Brief explanation of the drawing]

1 to 5 show the construction order of the present invention, in which FIGS. 1 to 3 and 5 are cross-sectional views, FIG. 4 is a side view, and FIG. 6 is a perspective view of restraining bars. Figures 7 and 8 are cross-sectional views showing the constrained state of the cost muscles, and Figures 9-
FIG. 13 is a front view of the lower ribs. 1...Discarded concrete, 3...Lower ribs, 4
...Lower main reinforcement, 6...Pressure board concrete, 11
...Support frame, 12...Receiving material, 13...Upper main reinforcement, 14...Upper cost reinforcement, 15...Restriction reinforcement, 16...
... Width stop bar, 17... Support bar, 18... Formwork.

Claims (1)

[Claims] 1 Place the meshed lower ribs on the ground,
A plurality of lower main reinforcements are placed on top of this, and pressure platen concrete is poured so that the ends of the lower reinforcement bars are separated from each other by an appropriate distance to the left and right and protrude upward. Support frames are arranged on both sides of the beam position, and multiple upper main reinforcements are arranged and supported on the receiving material stretched on the support frames, and the upper cost reinforcements, which are formed into mesh and bent into a portal shape, are placed on the upper main reinforcements. The upper and lower ribs are overlapped and connected, and restraining bars bent in a U-shape are attached to this overlapped part. After removing the support frame and receiving material, formwork is installed on the left and right of this reinforcing bar. A method for assembling reinforcing bars for underground beams, which is characterized by placing concrete between the formwork.