JPH0141790Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a girder block made of precast reinforced concrete that constitutes a parallel girder structure such as a parallel girder retaining wall.

[Prior art]

Figures 3 and 4 show girder blocks made of reinforced concrete that have been used in the past. The girder block A in Fig. 3 has an approximately quadrangular prism-like external shape, the central part has an H-shaped cross section, and the ends of the square cross section have fitting recesses 1, 1 on two opposing sides and penetrating through the center thereof. A through hole 2 for inserting a steel bar is provided. The girder block B shown in Fig. 4 has large and small locking steps 3, 3, 3', 3' on two opposite sides of both ends, and a through hole 2 passes through the center of the large steps 3, 3. , small step 3',
A semi-circular groove 4 is provided connecting the centers of the end faces of 3'.

The girder blocks A and B are assembled by fitting and joining the piece block C as shown in FIGS. 5 and 6, for example. The piece block C has a rectangular parallelepiped main body with a fitting protrusion 5 at the center of one surface and locking protrusions 6 on two opposing sides of the other surface, and a through hole 2 passing through the center of the fitting protrusion.
is drilled there. The fitting convex part 5 of the bridge block C is fitted into the fitting recess 1 at the end of the girder block A, and the two small locks at the butted ends of the two girder blocks B, which are perpendicular to the girder block A, are fitted. The steps 3', 3' are sandwiched and locked between the two locking protrusions 6, 6 of the piece block C, and the through holes 2, 2 of the girder block A, piece block C and the two girder blocks B are connected in the stacking direction. A parallel girder structure is constructed by inserting and fixing the steel bars 7 into the through holes formed by the grooves 4, 4.

The structure constructed in this way is given a function as a retaining wall by filling the inside with stones and the like. However, if they are piled up high like a grid and filled with stones, etc., a large load will be applied to a small area centered on the steel bar 7. For this reason, conventional girder blocks were often damaged at joints centered around the through holes through which the steel bars were inserted.

[Purpose of invention]

This idea was made in view of the above circumstances. The purpose is to propose a girder block that has high strength, especially compressive strength at the joints, and that is difficult to break and exhibits high strength as a parallel girder structure.

[Structure of the idea]

The following will explain the embodiments shown in the drawings.

Figures 1 and 2 are drawings showing the reinforcement arrangement of the girder block A according to this invention, and around the through hole 2 which opens into the fitting recess 1 at both ends, there is a spiral reinforcement 8 that is almost the same as the through hole 2. It is arranged without a core. Also, vertical lines 9 at both ends,
A horizontal reinforcement 10 and a hoop reinforcement 11 are arranged, and the horizontal reinforcement 10 is arranged along the H shape in the center of the H-shaped cross section.

[Action/Effect]

When girder blocks are stacked like parallel girders and a well girder structure is constructed, large stress mainly due to load acts on the joints centered around the through holes, but this girder block has spiral reinforcements arranged around the through holes. Because it is striated, it has particularly high compressive strength and is less prone to breakage than conventional products.

As mentioned above, this girder block is difficult to break and makes it possible to construct a high-strength parallel girder structure.

Incidentally, in the case of the girder block B, a similar effect can be achieved by disposing a spiral striation around the through hole 2.

[Brief explanation of the drawing]

Figures 1a and b are side and plan views showing the reinforcement arrangement of the girder block of the embodiment, Figures 2a and b are sectional views of the through-hole and central portions of the girder block in Figure 1;
Figures 3a, b and 4a, b are a side view and a plan view of the girder block, respectively, and Figures 5 and 6 show the girder block with piece blocks inserted into it and stacked in the shape of a parallel girder, with steel bars inserted and fixed. FIG. 2 is two mutually orthogonal longitudinal cross-sectional views of FIG. 1... Fitting recess, 2... Through hole, 3... Large locking step,
3'...Small locking step, 4...Groove, 5...Fitting convex portion, 6
... Locking protrusion, 7... Steel bar, 8... Spiral bar, 9... Vertical bar, 10... Transverse bar, 11... Hoop bar, A, B... Girder block, C... Piece block.

Claims (1)

[Scope of utility model registration request] In precast reinforced concrete girder blocks that are stacked in a parallel grid shape and have steel bars inserted and fixed in the stacking direction at the joints to form a parallel grid structure,
A girder block characterized in that a spiral bar is arranged around a steel bar insertion hole of the girder block and is approximately coaxial with the insertion hole.