JPH0141791Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a piece block that is fitted into a parallel girder structure using girder blocks made of precast reinforced concrete.

Prior Art As shown in Fig. 5, girder blocks 1 made of precast reinforced concrete are connected laterally and vertically by inserting piece blocks 2 into the block joints.
They are piled up in a cross-shaped structure, and a steel bar 4 is inserted and fixed through a through hole 3 that communicates in the stacking direction at the joint portion, thereby forming a parallel cross-shaped structure. In this way, a retaining wall made of double-sided retaining walls built up high and filled with stones and the like is subject to large stress at the joints. FIGS. 6 and 7 are longitudinal cross-sectional views of the joints, and a large load is applied in the vertical direction to the joints around the inserted steel bar 4. Furthermore, this structure is often constructed at a slight inclination as a retaining wall along the slope of a mountain, and large shearing forces of the inclination also act on the joints. For this reason, a high density of stress acts on the piece block, which is relatively small in shape and has a small pressure-receiving area, causing breakage.

Purpose of the invention This invention was created in view of the above circumstances. The purpose is to propose a piece block that has high strength, especially compressive strength, and can be used to construct a high-strength cross-shaped structure.

Structure of the idea This will be explained below with reference to the embodiments shown in the drawings.

In FIGS. 1a and 1b, the main body of the piece block 2 has a substantially rectangular parallelepiped shape, with a fitting protrusion 5 at the center of one surface, and two locking protrusions 6 on two opposing sides of the other surface.
6, and a through hole 3 is bored through the center of the fitting protrusion 5 to insert the steel bar. This piece block 2
The reinforcement is arranged as shown in Fig. 2a and b. That is, a fitting protrusion 5 is provided around the through hole 3 approximately concentrically with the through hole.
A spiral muscle 7 extending to a height of
Two sets of diagonal reinforcements 9, 9 and peripheral reinforcements 10 extending along the sides of the main body and bent around the locking protrusions 6, 6 are arranged.

Figures 3 and 4 also show piece blocks of the embodiment.

This piece block has a main body that is longer in one direction than the ones in Figures 1 and 2, and has two fitting protrusions 5 on one surface.
5, which passes through the center of the fitting protrusion 5 and has a through hole 3,
3 is drilled. Similar to the previous block, this piece block also has spiral stripes 7, 7 around the two through holes 3, 3, two parallel bars 8, 8, and two sets of two strips each centered on the spiral strips 7, 7. Oblique muscles 9, 9 and surrounding muscles 10 are arranged.

Function/Effect This piece block has the above structure. Although this piece block is subject to large stress at the joints centered around the through-hole through which the steel bar is inserted, it has high strength because nearly concentric spiral reinforcements are arranged around the through-hole. In particular, it has high resistance to compressive force and is difficult to break. Further, by arranging diagonal reinforcement as in the embodiment, it is possible to provide extremely large resistance against shear stress in the diagonal direction.

[Brief explanation of the drawing]

Fig. 1 a, b and Fig. 3 a, b are a side view and a plan view of the piece block of the embodiment, Fig. 2 a, b, respectively.
b, Figures 4a and b show the reinforcement of the piece blocks in Figures 1 and 3, respectively - a directional view and a plan view, and Figure 5 shows how the girder blocks are stacked and assembled in a parallel grid using piece blocks. The perspective view of the state, FIGS. 6 and 7, is a sectional view taken along the line shown in FIG. 5 and a sectional view taken in a direction perpendicular thereto. 1...digit block, 2...piece block, 3...through hole,
4... Steel bar, 5... Fitting projection, 6... Locking projection, 7... Spiral muscle, 8... Parallel muscle, 9... Oblique muscle, 10... Surrounding muscle.

Claims (1)

[Scope of utility model registration request] In a bridge block made of precast reinforced concrete that is fitted into a joint of a double girder structure in which girder blocks made of precast reinforced concrete are stacked in a parallel grid shape and a steel bar is inserted and fixed in the stacking direction at the joint, is a piece block characterized by a spiral strip that is almost concentric with the insertion hole.