SU490672A1 - Laying method of prestressed reinforcement cage in one-piece shape of circular section - Google Patents

Description

The main means for the implementation of the method is a tension stand consisting of a fixed stop 1 and an stop with a movable rod 2 on which the core 3, which consists of two tubes nested in each other, is fixed at one end.

At this tension stand, a prestressed reinforcement cage is fabricated in a known manner in the following sequence: a small end 4 is inserted into the grips of the fixed stop 1 and a moving bar and 2, and a large end 5 is threaded by a hole on the core 3.

The caps are put on endlessly wound reinforcement 6, which is a high-strength wire, and is prestressed; then the assembly and transverse reinforcement are installed, i.e. the prestressed reinforcement cage is completely manufactured; this is followed by preparation and proper laying of the pre-stressed reinforcement cage into an integral form (pipe).

To do this, first of all, the strength of the preliminary injection of the longitudinal reinforcement 6 of the framework is reduced to 5-10% of the projected one. Then, the tube 7 of the core 3 extends to the stop with the small tip 4 and is fixed in this position by the clamp 8. It is released from the connection with the non-moving support 1 the small tip 4, which with the prestressed reinforcing cage and the core 3 turns in a horizontal plane through an angle of 15 20 ° relative to the longitudinal axis of the tension stand, around the axis 9 of the fastening of the core 3 and the grip 10 of the large tip 5. By the crane, from the small end 4, the integral form And pulls on the prestressed reinforcement cage, By means of a small tip 4 on the core 3 up to the stop with a big tip 5. Form 11 with a preliminary tensioned reinforcing cage in it turns into a position coinciding with the longitudinal axis of the tension stand, and the small tip 4 is closed in the grips of the fixed stop 1 The tension of the longitudinal reinforcement 6 of the frame to the design and the means of the stop screws 12 and the lock washer 13 is produced. This force is transferred to the shape of the longitudinal reinforcement.

It is released from the connection with the stop 1 small tip 4 and one-piece mold 11 with a prestressed reinforcing cage in it and the core 3 is turned around axis 9 at an angle of 15-20 ° to the longitudinal axis

tension stand. It is released from the connection with the movable rod 2 of the big tip 5, and the integral part 11 with the small tip 4, the large tip 5 and the pre-stressed reinforcing cage in it is removed from the tensioning stand with its core with the core 3 and transferred to the concrete positioning station .

Subject invention

Claims (2)

1- A method of laying a pre-stressed reinforcing cage into a one-piece circular section, consisting in installing a core with a reinforcement cage strung on it into the cavity of the form, transferring the stress of the framework to the form and removing the core released from the reinforcement from .I and h u and with the fact that, in order to reduce the number of cores and reduce metal intensity and labor intensity, the tension on the core the reinforcement cage is made by gears and forces from its prestressing and the stand, to the movable rod of which the core is pivotally attached at one end, and the installation of the core with reinforcing the frame into the cavity of the mold and the removal of the core released from the reinforcement is carried out by moving the mold along the axis of the core, which for this period is tilted around the hinge. 2. A method according to claim 1, characterized in that 5-10% of the design voltage of the reinforcement is transferred to the core, and the pressure and transfer of the design reinforcement force to the mold is carried out on the stand, returning the core together with the form slid over it from the inclined position to the horizontal. // Fig 1