SU1206100A1 - Method of manufacturing large-size reinforced concrete box-section blocks - Google Patents

Description

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The invention relates to bridge construction and can be used for the manufacture of interchangeable e s box blocks - impressions of bridge structures.

The purpose of the invention is to reduce the labor intensity and improve the quality of the end surfaces matched on dry joints.

Figures 1 to 6 show flow diagrams of technological processes that are consistently carried out in the manufacture of end face shuttering boards with working surfaces K and B; Fig. 7 illustrates the manufacture of a part of a unit with one butt surface; 8 shows the blocking of the block; figure 9 - separate production of two parts of the block; figure 10 - the union of the two parts of the block into a single unit.

Metal plates-billets 2 80–100 mm thick with the surface machined on the planer upwards are placed on the plaza 1 along the perimeter and the entire area of the working surface of the formwork face shield, and their design position is outlined in the plan and profile with setting screws 3, after which The sheets are rigidly secured to the plaza against displacements. Thus, a reference base surface A (Fig. 1) is created. When each face shield with working surface B is sequentially manufactured on this surface, said metal plates-billets 2 are installed with a surface machined with a planer down (figure 2) to form it, with local gaps between the butt surfaces and B of sheets 2 Do not exceed 0.2 mm.

Then the formwork 4 is installed in the design position, the reinforcement is made and the concrete is molded with concrete 5 metal sheets (Fig. 3) and after the concrete has been set to design strength, the finished shield with working surface 6 is removed from the groove and installed on the production line of the blocks. All shields with a working surface b are made in a similar way, after which the metal plates 2, forming the base working surface, are removed from the plaza and installed on the plaza of figure 4) the finished face shield

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with the working surface b upwards and on it are formed the working surfaces L of the successively manufactured face shuttering boards of this

5 type (Fig.5 and 6 with the application of the described technological processes (Fig.2 and 3) in the manufacture of panels with a working surface 6

The latter in the same way make a matrix shield-standard with a working surface, which, if necessary, is used to manufacture an additional number of facing panels, for example, in the case of tS development of production capacity

for the release of these blocks or to replace a worn shield with the same technical parameters.

Applied design end

20 shields possesses increased rigidity and geometrical invariability under the effect of design loads and a high degree of wear resistance of the working surface.

25 of all shields, which ensures an increase in the quality of the butt surfaces of the blocks produced and increases the service life of formwork with the use of such shields.

30 Blocks are made as follows.

On the end formwork shield-conductor 6 (Fig.7) with a horizontal position of its working surface

35 b are installed in the design position of the outer 7 and inner 8 formwork of the faces 9 of the block and the reinforcement cage 10. After that, block 11 is concreted over the entire cross section on

0 incomplete height with under-0.1-0.2 N, where H is full pro-. The height of the block, but not less than the thickness of this layer, assigned by the project, taking into account the applied

45 of the material for hauling block 11 to the working surface of the formwork panel and providing the necessary technological conditions for performing work with the required quality.

50 After the concrete block of the required strength is formed of the necessary strength, the end formwork shield conductor 6 (Fig. 8), together with the block 11, rotates around the hinge;

55 the surface b of the conductor shield (the butt of the surface B of the block) is placed in a vertical position and fixed. Parallel working top31

B of the shield of the conductor 6 at a design distance equal to H (full block height), the working surface A of the second face shield 12 is installed in a vertical position and after performing the necessary set of preparatory operations, the block 13 is refined and when the concrete reaches the design strength Stripping and removing the finished block from the pre-casting station are convenient.

According to another embodiment of the method, formwork boards 6 and 12 are placed in a horizontal position, and on each of them a part of the block is made of a height, for example, 0.4-0.45 N (FIG. 9 ;.

After the concrete has gained the necessary strength, the boards are rotated with the parts of the blocks made on them, their old surfaces 6 are installed and in the design position and fixed, and the parts of the block are homologated into a single block (figure 10).

The proposed technology allows the manufacture of blocks with variable

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metrics due to the possibility of installation of formwork panels 6 and 12 in an inclined and vertical position.

The specified blocking of the block on the thickness of 0.1–0.2 N, where H is the full height of the block, is determined by the presence of anchor niches at least 15 cm deep in the end of the block to preload high-strength reinforcement and 10 to ensure proper workability. concrete in the vertical position of the end formwork shield, which has a significant height, for example, 3–5 m.

Concreting the main part of a large-sized (in cross section) block with a horizontal position of the face formwork shield, in which the overall height of concreting is reduced to 1 m, reduces the laboriousness of block manufacturing and improves the quality of the surfaces mated at dry joints, due to the possibility of more efficient compaction concrete mixtures when concrete building and using stiffer concrete mixtures.

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Claims (1)

METHOD FOR MANUFACTURING REINFORCED-CONCRETE LARGE-SIZED BLOCK SECTION BLOCKS used in bridge building by concreting in formwork with vertically arranged end shields and formwork, characterized in that, in order to reduce the complexity and improve the quality of the end surfaces that are mated on dry concrete, which are previously mated on concrete end shields located, and concreting the rest of the block with vertically located shields is 0.1 - _from 0.2 block height. ® 1 Z 3 Figure 1 SU „,, 1206100>