JPH0237451B2 - KONKURIITOKOZOBUTSUNOTETSUKINOYOBIPCSHIISUNOKABURIHOJIHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for retaining the cover of reinforcing bars and PC sheaths of concrete structures that can be used in offshore structures and the like.

When pouring concrete for a conventional box-shaped concrete structure used for offshore structures, such as the one shown in the front cross-sectional view of Figure 1, a second - Concrete dice 2A shown in Figure A, synthetic resin poly dice 2B shown in Figure 2-B, and synthetic resin polycosmic dice 2C shown in Figure 2-C were arranged at appropriate intervals. After placing the reinforcing bars 3 on top, concrete was poured for the bottom plate, and in order to maintain a cover on the side plates to ensure the distance between the reinforcing bars 3 and the concrete surface. In addition to attaching polydonuts 2D made of synthetic resin as shown in Figure 2-D to the reinforcing bars 3 as spacers, the
The reinforcing bar spacer 2E shown in the figure or the polycosmic bracket 2
C etc. are installed.

When a concrete structure manufactured by such concrete pouring is used for an offshore structure, seawater may penetrate into the reinforcing bars 3 from the spacer parts such as Dice 2A, Polydice 2B, Polycosicake 2C, and Polydonatsu 2D. , there is a problem that the reinforcing bars 3 are corroded.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, and provides a method for retaining the cover of reinforcing bars and PC sheaths without using spacers for retaining the cover of reinforcing bars etc. during concrete pouring. The purpose is to prevent seawater etc. from entering the concrete.

That is, the reinforcing bars and
The PC sheath cover retention method is characterized in that a steel frame member that supports the inside of a concrete structure is provided with a support member that protrudes into the concrete pouring area, and the support member retains the reinforcing bars and the PC sheath. It is.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 is a front sectional view of a concrete structure in an embodiment of the present invention, and FIG. 4 is a side sectional view of FIG. 3.

This concrete structure is used as an offshore structure like the conventional example shown in Fig. 1, but the H
A shelf-shaped support member 5 that protrudes into the concrete placement area is welded to the outer periphery of the steel frame member 4 made of shaped steel, and the reinforcing bars 3 and the PC sheath 6 are suspended from the support member 5 at a predetermined interval. It is held in

In addition, what is shown by 7 in FIG. 3 is a pipe support that reinforces the inside of the reinforcing steel member 4.

By holding the reinforcing bars 3 and the PC sheath 6 with the supporting members 5 and pouring concrete as described above, the surface is covered with one piece of concrete without using any spacers as shown in Figure 1. Concrete structures can be manufactured.

Next, FIG. 5 is a front sectional view of a concrete structure in Example 2 of the present invention, which has almost the same configuration as Example 1 in FIG. 3 and was manufactured by almost the same method. However, this Example 2
In Example 1, support members 5 of various shapes are used as the support members 5 provided on the steel frame member 4.

That is, for the bottom plate portion of the reinforcing bars 3, the support member 5A in Fig. 6-A or 5B in Fig. 6-B is used.
For the deck section, support member 5C in Figure 6-C or 5D in Figure 6-D is used, and for the side plate,
The support member 5E in Figure 6-E or 5F in Figure 6-F shall be used for lifting hardware,
On the other hand, as hardware for lifting the PC sheath 6,
For the bottom plate part, 5G and 6th in Figure 6-G are used.
Support members 5H in Figure 6-H, 5I in Figure 6-I, 5J in Figure 6-J, and 5K in Figure 6-K, 5L in Figure 6-L, and 5L in Figure 6-L for the deck section. I am trying to use the 5M support member shown in Figure 6-M.

Therefore, if a concrete structure is manufactured by adopting the reinforcing bar and PC sheath cover retention method of the present invention, the reinforcing bar and PC sheath can be fixed without using any reinforcing bar spacers, concrete spacers, synthetic resin spacers, etc. The support members protruding from the internal steel frame into the concrete casting area can securely hold the cover, so even when used as an offshore structure, there will be no intrusion from the ocean, and there will be no risk of corroding the reinforcing steel, extending the durability of the concrete structure. It has the effect of extending the number of years.

[Brief explanation of drawings]

Figure 1 is a front cross-sectional view of a conventional concrete structure, Figures 2-A to 2-E are enlarged perspective views of various spacers used in Figure 1, and Figure 3 is a cross-sectional view of a conventional concrete structure. 4 is a front sectional view of the concrete structure in Example 1, FIG. 4 is a side sectional view of FIG. 3, FIG. 5 is a front sectional view of the concrete structure in Example 2 of the present invention, and FIGS. Figures up to 6-F are enlarged views of various support members for lifting reinforcing bars used in Figure 5, and Figures 6-G to 6-M are enlarged views of various support members used in Figure 5.
FIG. 4 is an enlarged view of various support members for lifting the PC sheath used in the figure. 3...Reinforcing bar, 4...Steel member, 5,5A~5M
...Supporting member, 6...PC sheath.

Claims (1)

[Claims] 1. Reinforcing bars and PC for a concrete structure, characterized in that a steel frame member that supports the inside of the concrete structure is provided with a supporting member that protrudes into the concrete placement part, and the supporting member holds the reinforcing bar and a PC sheath. How to keep the sheath covered.