SU754027A1 - Form for placing concrete into foundations of columns - Google Patents

Description

(54) FORMWORK FOR CONCRETING THE FOUNDATIONS

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The invention relates to the construction, in particular to formwork, which can be used for the erection of concrete foundations.

mixtures.5

Blocks are known for concreting building structures, in particular for the production of monolithic reinforced concrete foundations. The block form includes a frame, hinged Q fixed shields, formwork and accessories for changing the position of the shields. The construction of the block form allows the concreting of structures of various sizes 1) 5

However, this formwork also has its drawbacks. that the boards are not diverted from the concrete at the same time, which requires performing sequential operations and 20 increases the labor intensity of the stripping. Also known is the design of block formwork for concreting massive foundations, which includes the formwork blocks of the shoe, sub-column and cup. Ashmak formwork is a one-piece block. The under-column block consists of four frame frames, which are on each side each 30, UNDER COLUMNS

by means of hinged hangers attached to the disassembly racks. The disassembly pillars, articulated hangers and frame panels of the sub-column formwork constitute a rigid spatial block construction that does not require additional fastenings. Hinged pendants of equal length are mounted horizontally in the design position 2.

The disadvantage of the formwork is that when force is applied to the formwork posts with the help of a lifting mechanism, the latter at the initial moment rise up relative to frame panels by the amount of gaps in the hinges of the suspensions, and then the formwork forces emerge from the concrete surface and shift the formwork panels along verticals The dismantling force is very small, since it is necessary to overcome the forces of adhesion of the formwork with concrete over the entire area of contact at the same time.

 The purpose of the invention is to reduce the labor intensity of assembly and disassembly; | ny works and the amount of stripping effort. The goal is achieved by the fact that the formwork for concreting the foundations for the columns includes interconnected formwork blocks of the shoe part and subframe with frames, shields and fasteners, the shields of the formwork block of the subframe are connected to the frame by means of hinged hangers, besides, the hinged hangers are made of different lengths, and the shortest of them are inclined with respect to the shields, with the frame of the formwork block of the shoe part T-ieH with through inclined grooves, and each its shield is suspended from the frame with the fingers located in the inclined slots of the frame.

FIG. 1 shows the proposed formwork, a general view; in fig. 2 a swivel assembly of the formwork panel of the block of the shoe part; on

FIG. 3 - kinematic formwork scheme.

The formwork includes the formwork block of the shoe part 1, with the frame 2, to which the formwork boards of block 1 of the shoe part are attached by means of hinges containing pin 3 mounted in the hole 4 and the brackets 5. The brackets 5 are rigidly connected to the shields 6.

The holes 4 of the hinge (see Fig. 2) are made in the form of a groove (E 1.5-2.0d, where I is the length of the groove, ad is the width of the groove) located obliquely with respect to the formwork axis, with the lower part of the groove located on 40-50 mm closer to the middle part of the formwork. Shields 6 in the closed state are held by bolts 7 and form a volume in the form of an inverted truncated pyramid. The frame 2 is rigidly mounted with mounting racks 10 connected to the skeleton 8 of the sub-column formwork block 11 equipped with mounting loops 9. Dits 12 of the sub-column formwork unit are connected to the assembly racks 10 by different hinge hangers 13, 14 and 15 of different lengths formwork panels 12 (the hinge on the mounting rack 10 is installed above the hinge of the same hinge suspension 15 mounted on the board 12) above the hinge.

The longest articulated hinges 13 are installed in the upper part of the under-column formwork block 11. In the upper part of the boards of the 12-column formwork block 11 there are holes in which there are plates 16 with pins that secure the top of the formwork. In the lower part of the boards 12, jacks are provided for insertion pins 17 / fixing the bottom of the formwork.

Formwork works as follows 3 ohm.

When installing the formwork to the place where the Foundation was erected, the formwork boards 6 blocks of the shoe part 1 manually

bolted 7, while the gap in the upper part of the hinge between the finger 3 and the upper end of the hole 4 is missing (selected). After the installation, the formwork panels 12 of the sub-column 11, under the influence of the formwork mass, are installed in the design position (vertical) and in the lower part are fixed with pins 17, and in the upper part - with plates 16 with pins.

When dismantling the formwork, bolts 7, fixing shields 6, plates 16 with pins and insertion pins 17, fixing shields 12. are removed. The formwork is lifted up by means of a lifting crane 9 by means of mounting loops. At this point, the desks 10 rise upward relative to the formwork by the amount of gaps in the hinge suspensions 13, 14 and 15, and then slowly begin to translate these hinge suspensions from a horizontal to an inclined position. At the same time, under the influence of the mass of the foundation, the formwork panels 6 are lowered down, choosing a gap in the hinges between the fingers 3 and the lower ends of the holes 4. This increases the angle between the planes of the boards 6 and the fixed planes of the shoe due to the fact that the center of rotation of the shield (in the hinge ) approaching the middle of the formwork. There is a moment when the shields 6 are detached from the plane of the shoe and open, freeing the lower part of the foundation. Since the lower row of hinged hangers 15 is set at an angle to the shield 12 and the dismantling stand 10, the possibility of blocking the form-case block of the under-column 11 during the dismantling and further development of the force by the crane due to the detachable moment arising in the hinged hangers 13, 14 and 15 occurs. the separation of formwork panels 12 first in the lower zone, then in the middle and, finally, in the upper zone.

The foundation is freed from the formwork, which is relocated to a new place of concreting.

The detachable force when removing the formwork from the foundation with an increase in the height of the column is practically not increased and remains constant due to the fact that the articulated suspension is installed of variable length extending to the top of the block of each subsequent row and at depending on the size of the formwork (foundation) of the PAC, the number and length of the suspensions of postductional, as well as the optimum effort of breaking the formwork across the zones, ments technique bezizlozhennye in CH and R III-A,

danger, P-70.

Claims (2)

1. Authors. Certificate of the USSR No. 393433, cl. E 04 G 11/20, 1971. 2. Guidelines for the use of formwork for the construction of monolithic reinforced concrete structures; M., Stroy5 ed., 1974, vol. 3, s. 36, fig. 14.