JPS5923968B2 - Molding method of concrete blocks for joining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming non-interchangeable precast concrete blocks that are assembled using guide keys in bridges and the like.

As shown in the schematic diagram in Figure 1, when precast concrete blocks 1 are connected to form a bridge girder, etc., an epoxy adhesive or the like is used at the joints between the concrete blocks 1 to introduce punch stress. The connection work is then performed.

Therefore, it is necessary to manufacture the joint surfaces of adjacent concrete blocks 1 so that they are in close contact with each other.

This is particularly important when adhesives are used in seams.

It also makes joining work easier, and concrete blocks 1
A guide key 2 is often used to eliminate mutual misalignment, but in that case as well, the guide key 2 needs to be attached accurately.

The method of forming concrete blocks for joining according to the present invention effectively deals with the above-mentioned problems.

That is, when forming adjacent concrete blocks for joining, the male and female guide keys are fitted, and the assembly screws are screwed into the small diameter screw holes provided along the axis of each guide key. The concrete is placed in this state.

To separate the joining surfaces, methods such as the partition plate method using thin iron plates, etc., or the concrete pouring method using a release agent, etc. are used, and after the concrete has hardened, the concrete blocks are separated along the axis of the guide key. Apply force.

At this time, the concrete blocks are broken into smaller diameter assemblies and separated from each other.

By using this method when joining these blocks, it is possible to join the adjacent joining surfaces perfectly, and since there is no misalignment of the guide key, it is possible to use the guide key during joining work. Once the keys are fitted, the concrete blocks will be completely attached to each other.

The present invention will be described below based on illustrated embodiments.

Figures 2a and 2b, 3ae and 4b, and 4 show male and female guide keys 2a used in this invention.

2b, a protrusion 3a at the tip of the male guide key 2a fits into a recess 3b at the tip of the female guide key 2b.

Further, at the rear end of each guide key 2a, 2b, there are provided 5a, 5b with a convex or four portions as anchoring portions, so that sufficient anchoring force can be obtained when the guide keys are embedded in concrete.

Small diameter screw holes 4a and 4b are provided along the axis of the male and female guide keys 2a and 2b, respectively, in the convex portion 3a and concave portion 3b of the guide keys 2a and 2b. This can be done by tightly connecting the guide keys 2as and Zb.

5, 6 and 1 show the guide keys 2a, 2.
Fig. 1 shows a method for forming concrete dome mink 1 using b.

Figure 5 shows concrete block 1 using the partition plate method.
In this figure, a partition plate 8 made of a thin plate is attached to a formwork 7 arranged in the continuous direction of the concrete blocks 1, and this is used as a joint surface between the concrete blocks 1.

At this position of the partition plate 8, the aforementioned male and female guide keys 2a and 2b are connected with the assembly screws 6.

Note that the protrusion 3a of the male guide key 2a is attached to the partition plate 8 in advance.
Prepare a hole to pass through.

When concrete is placed in this state and separated after hardening, the assembly screws 6 are broken and each concrete block 1 can be separated.

Figure 6 and Figure 1 show the case where concrete block 1 is formed using the concrete pouring method, in which the joint surface of the already completed concrete block 1 is used in place of the formwork for the next concrete block 1. It is something.

First, as shown in FIG. 6, a concrete block 1 in which a male guide key 2a is embedded is formed.

At this time, as shown in the figure, a frame 12 for fixing the guide key is attached to the formwork 10 on the joint surface, and the male guide key 2a is fixed.

That is, screw into the screw hole 4a of the male guide key 2a,
The assembled screw 6 is fixed to the guide key fixing frame 12 using a nand 13.

After demolding, apply a release agent to the joint surface of the completed concrete block 1, and insert the female guide key 3a into the assembly screw 6.
The concrete block 1 is then screwed together and used as a formwork to form the next concrete block 1, as shown in FIG.

Please use two or more sets of guide keys for one joint surface to prevent rotational movement of concrete blocks.

This invention consists of the above-mentioned structure, and since the joint surfaces of concrete blocks can be perfectly matched,
Precise construction becomes possible.

In addition, when pouring concrete, the male and female guide keys are tightened with assembly screws in advance, so there is no misalignment of the guide keys, and accurate joining can be achieved by simply fitting the guide keys during construction. , construction is easy and quick.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a bridge constructed using the PuV't Yast block construction method, Figure 2a is a front view of the female guide key used in this invention, Figure 2 is its vertical sectional view, and Figure 3a is a A front view of the male guide key, FIG. 3 is a vertical cross-sectional view thereof, and FIG. 4 is a vertical cross-sectional view showing how the male and female guide keys fit together.
FIG. 5 is a cross-sectional view of an embodiment using the partition plate method, and FIGS. 6 and 7 are cross-sectional views of an embodiment using the concrete pouring method. 1... Conch IJ-) 7" Conch, 2, 2a,
2b...Guide key, 3a...Protrusion,
3b...Concavity, 4a, 4b...Screw hole, 5a, 5b...Fixing part, 6...Assembling screw, 7...・Formwork, 8... Partition plate,
9.10.11... Formwork, 12... Guide key fixing frame, 13... Nut.

Claims (1)

[Claims] 1. When pouring concrete into a formwork to form adjacent concrete blocks for joining, a female guide key is placed on the joint surface of one concrete block, and the female guide key is placed on the joint surface of the other concrete block. For assembly, a male guide key fitted to the key is embedded, and the female and male guide keys are each provided with small diameter screw holes along their axes, and screwed into both of these screw holes. Concrete is poured by connecting the guide keys with screws, and after the concrete hardens, the concrete blocks are separated along the axis of the guide keys, and the assembly screws are broken to separate the concrete blocks. A method of forming concrete blocks for joining.