RU2239691C2 - Method of reinforced concrete structure, mainly wall, forming with the use of sliding form and vibratory cantledge - Google Patents

Abstract

FIELD: building, particularly construction of residential, public, industrial and other buildings with cast-in-place walls erected in sliding form.

SUBSTANCE: method involves installing intermediate form panels; pouring concrete mixture and compacting thereof; laying horizontal row of reinforcement at bottom level of wall forming cavity; pouring next layer of concrete mixture above reinforcement layer up to upper form panel edges and compacting concrete mixture by vibratory cantledge; removing vibratory cantledge, taking away spreader bars and intermediate form panels; laying the next row of reinforcement; connecting said rows of reinforcement one to another; lifting sliding form up to the level of next wall forming cavity; installing intermediate form panels; performing concreting process with concrete mixture compaction by means of vibratory cantledge; repeating above operations. Vibratory cantledge body is tray-like and has sockets arranged inside body. Installed in sockets are vibratory means formed as vibratory heads of immersion vibrators.

EFFECT: increased intensity of concrete mixture compaction, improved work conditions, increased quality, creation of conditions necessary for horizontal reinforcement inspection and drawing up of acts on implicit works.

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Description

The invention relates to the field of construction and can be used in the construction of residential, public, industrial and other types of buildings, the walls of which are made of monolithic reinforced concrete in a sliding formwork.

There is a traditional method of forming monolithic reinforced concrete walls in a sliding formwork, which provides for mandatory compliance with the requirements for laying the next layer of concrete mixture not higher than the level of the last row of horizontal reinforcement [1].

This requirement greatly complicates the work of laying and compacting concrete in the molding cavity, it allows mainly internal vibration to be used and makes it difficult to use almost all other effectively working concrete compaction devices in wall formwork. Because of this, the working conditions of concrete workers worsen and labor costs for concreting wall structures increase. At the same time, the quality of concrete compaction deteriorates when laying cost-effective concrete mixtures of reduced mobility (draft standard cone 1-2 cm), which is caused by a decrease in the radius of the sealing zone around the tip of the deep vibrator. In this case, it is difficult to eliminate the complications of the work of examining the correct installation of horizontal reinforcement over the surface of the laid concrete and drawing up acts for hidden work, since this reinforcement is mounted at once in several different places of the working area of the sliding formwork and at different levels in height.

There is an improved method for forming reinforced concrete structures in a sliding formwork by installing intermediate panels in the formwork, followed by laying and compacting the concrete mixture, removing and rearranging the intermediate panels one after the other after laying and compacting the concrete mixture [2].

This method is also not without the drawbacks of the above method. Known vibrational load for surface compaction of concrete mix [3]. Its disadvantage is that it is quite bulky.

The technical problem to which the invention is directed is the concreting of monolithic reinforced concrete walls in a sliding formwork by the most intensive compaction of concrete in the molding cavity with the help of superimposed surface vibration weights. This method of concreting relieves concrete workers from prolonged and unfavorable work with deep vibrators and provides the most uniform compaction of concrete when laying economical concrete mixtures with reduced mobility (standard cone draft 1-2 cm).

The problem is solved in that in the method of forming reinforced concrete structures, mainly walls, in sliding formwork by installing intermediate panels in the formwork, followed by laying and compacting the concrete mixture, removing and rearranging the intermediate panels immediately after laying and compacting the concrete mixture, at the bottom level during the rise of the sliding formwork of the newly formed molding cavity, a number of horizontal reinforcement are laid, the sliding formwork is raised to the level of the new mold cavity installation, installation of intermediate boards, then laying on top of this row of the next layer of concrete mixture to the level of the top of the sliding formwork panels, followed by compaction of the concrete with a vibrating weight, then the vibrating weight is removed, the intermediate boards are removed one by one, the next row of reinforcement is laid, the horizontal reinforcement is fixed with frames of vertical reinforcement, lifting the sliding formwork to the height of the next molding cavity, the installation of intermediate panels, then concreters are carried out compaction with vibration load.

The vibrational load comprises a housing and vibration exciters, the housing is made in the form of a trough with nests arranged inside it, into which vibration exciters are installed in the form of vibration tips of deep vibrators.

The longitudinal dimensions of the surface vibration weights that form the technological kit are set in accordance with the distances between the vertical reinforcing cages, jack rods, side faces of embedded parts and openings, as well as other parts of the construction of a monolithic reinforced concrete wall.

Figure 1 shows the initial stage of the cyclic repetition of a set of works with the next last in height near a horizontal reinforcement before lifting the sliding formwork to the height of the next molding cavity.

Figure 2 schematically shows the molding cavity between the shields of the sliding formwork with the intermediate shields, spacers and the last next highest horizontal reinforcement placed in it.

Figure 3 - the same when filling the molding cavity with concrete mixture and its compaction using a surface vibrating load.

In Fig.4 - the same after removing the surface of the vibratory load when alternately removing intermediate shields.

In a sliding formwork at the bottom level, next along the rise of the sliding formwork of the newly formed molding cavity, a number of horizontal reinforcing bars are laid, the sliding formwork is raised to the level of the new molding cavity, intermediate boards are installed, then laying on top of the next layer of concrete mixture to the top of the sliding formwork panels 1, followed by compaction of the concrete mixture with a vibrating load 6, then the vibrating weight 6 is removed, the spacers 7 are removed, and the intermediate shields 2, laying the next row of reinforcing bars 4, fixing the rows of reinforcing bars in the design position, lifting the sliding formwork 1 to the height of the next molding cavity, installing intermediate shields 2, then concreting with compaction with vibration load 6, then repeat the whole complex of works.

Vibration load 6 has a body made in the form of a trough 8 with nests fixed inside it, into which vibration nozzles are installed in the form of vibration tips 9 of deep vibrators.

In the process of implementing the method, the last row of horizontal reinforcement 4 is inspected in the prescribed manner and executed by an act for hidden work, stopping the rise of the panels 1 and the entire sliding formwork system for the duration of this control procedure.

The proposed method allows for the most intensive compaction of economical concrete mix laid in sliding formwork, while improving the working conditions of concrete workers and improving the quality of concrete compaction, and also creates the necessary conditions for reliable examination of laid horizontal reinforcement and execution of relevant acts for hidden work.

Sources of information

1. The Ministry of bakery products of the USSR. Glavlevatormelstroy. Central Research Laboratory (TsNIL). Instructions for the construction of reinforced concrete structures in sliding forms. - M., 1957, p. 35, p. 34-35.

2. USSR, A.S. No. 483505, publ. 09/05/1975, according to class E 04 G 11/22.

3. A quick reference to concrete and reinforced concrete, ed. Jacobson, Y.M., Sovalov, I.G. - M .: Stroyizdat, 1974, p.126, 130.

Claims (1)

A method of forming reinforced concrete structures, mainly walls, in a sliding formwork by installing intermediate boards in the formwork, followed by laying and compacting the concrete mixture, removing and rearranging the intermediate boards immediately after laying and compacting the concrete mixture, characterized in that they are laid at the bottom of the molding cavity a row of horizontal reinforcement, then laying on top of this row another layer of concrete mixture to the level of the top of the sliding formwork panels, followed by compaction of the concrete of the mixture with vibrational load, then the vibrational load is removed, the intermediate panels are removed one by one, the next row of reinforcement is installed, the reinforcement is fastened, the sliding formwork is raised to the height of the next molding cavity, the intermediate panels are installed, then the concrete is concreted with the vibrational load, the casing of which is made in the form troughs with nests reinforced inside it, into which vibration nozzles are installed in the form of vibration tips of deep vibrators.

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