RU2795727C1 - Device for passing beams of reinforcing strands and method for its implementation - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: invention is intended for use in the manufacture or erection of prestressed concrete structures and buildings. A device for passing beams of reinforcing strands through curvilinear channel formers when creating prestressed reinforced concrete shells includes two anchor clips connected to each other with the possibility of rotation relative to each other, in the first of which bundles of reinforcing strands are fixed, and in the second of which is a traction element made in form of a bundle of ropes, as well as a traction device containing a trolley with outriggers, racks, a traverse and a pull beam with grippers, traction jacks of cyclic action, the bodies and rods of which are connected to the traverse and the pull beam, respectively. The device is equipped with a frame mounted on the trolley, with which the hydraulic cylinders for lifting the traverse and the rack are fastened. Racks are equipped with support platforms for interaction with the traverse. Construction of the formwork is carried out, channel formers with support sleeves are installed, followed by concreting, pulling bundles of reinforcing strands through the channel formers using traction device 5 and traction elements 4, followed by tensing of the reinforcement bundles. Before pulling the traction elements, the longitudinal axes of the grippers of the traction device and the support cup are aligned with each other and the traverse is moved until it interacts with the supporting platforms of the racks. After pulling the anchor clips to the support sleeve, the traverse is moved to the frame surface, followed by pulling the anchor clips from the support sleeve to the required length and detaching the bundles of reinforcing strands from the anchor clips for subsequent testing of the reinforcement bundles.

EFFECT: improved device performance.

3 cl, 7 dwg

Description

The invention relates to the field of construction and is intended for use in the manufacture or erection of prestressed concrete structures and structures with increased requirements for cracking, especially those operated under aggressive environmental influences, as well as with high force parameters in prestressed concrete structures of bridges, tunnels, tanks, silos, protective shells of nuclear power plants, etc., in which high-strength reinforcing ropes are used as bundles of prestressing reinforcement, both in a polyethylene tube and without a tube, laid in channels.

A device is known for passing beams of reinforcing strands through curvilinear channel formers when creating prestressed reinforced concrete shells, including two anchor clips connected to each other with the possibility of rotation relative to each other, in the first of which bundles of reinforcing strands are fixed, and in the second - made in the form of a bundle of ropes a traction element, as well as a traction device containing a trolley with outriggers, racks, a traverse and a pull beam with grippers, traction jacks of cyclic action, the bodies and rods of which are connected to the traverse and the pull beam, respectively [1].

There is also known a method for the construction of stressed reinforced concrete structures, including the construction of formwork, the installation of channel formers with support sleeves, concreting, pulling bundles of reinforcing strands through the channel formers using a traction device and traction elements, followed by tension of the reinforcement bundles [1].

These device and method allow efficient transmission of bundles of reinforcing strands through curvilinear channel formers when creating prestressed reinforced concrete shells. However, the operation of these devices revealed certain disadvantages.

Due to the fact that the pulling jacks of the device are located horizontally, it is necessary to use guides of the traction element, which leads to increased forces on the traction device due to friction of the traction element in the guides, that is, an increase in the power and weight of the traction device, which leads to an increase in operating costs.

Horizontally located jacks occupy a large area and therefore the stroke of the jacks has to be reduced, which leads to a decrease in the rate of transmission of bundles of reinforcing strands through curvilinear channel formers.

The result to which this technical solution is directed is to increase the performance of the device while reducing operating costs.

This result is achieved due to the fact that in the device for passing bundles of reinforcing strands through curvilinear channel formers when creating prestressed reinforced concrete shells, including two anchor clips connected to each other with the possibility of rotation relative to each other, in the first of which bundles of reinforcing strands are fixed, and in the second is a traction element made in the form of a bundle of ropes, as well as a traction device containing a trolley with outriggers, racks, a traverse and a pull beam with grippers, traction jacks of cyclic action, the bodies and rods of which are connected to the traverse and the pull beam, respectively, and the device is equipped with installed on the trolley by a frame with which the hydraulic cylinders for lifting the traverse and rack are fastened. Racks are equipped with support platforms for interaction with the traverse.

The specified result is also achieved due to the fact that in the method of constructing stressed reinforced concrete structures using the above device, including the construction of formwork, the installation of channel formers with support sleeves, concreting, pulling bundles of reinforcing strands through the channel formers using a traction device and traction elements, followed by tension of reinforcing beams, before pulling the traction elements, the longitudinal axes of the grips of the traction device and the support sleeve are aligned with each other and the traverse is moved until it interacts with the support platforms of the racks, and after pulling the anchor clips to the support sleeve, the traverse is moved to the upper surface of the frame, followed by pulling the anchor clips from support cup and detaching the bundles of reinforcing strands from the anchor clips.

An example of the proposed technical solution is illustrated by drawings, where figure 1 shows anchor clips, figure 2 - layout of the device when performing the transmission of bundles of reinforcing strands through curvilinear channel formers when creating prestressed concrete shells, figure 3 - device for passing beams reinforcing strands through curvilinear channel formers, installed under the supporting glass of the channel former, in Fig.4-7 - illustrations explaining the steps for passing bundles of reinforcing strands through curved channel formers.

A device for passing bundles of reinforcing strands through curvilinear channel formers when creating prestressed reinforced concrete shells includes two anchor clips 1, 2 connected to each other with the possibility of rotation relative to each other, in the first of which bundles of reinforcing strands 3 are fixed, and in the second - made in the form of a bundle ropes traction element 4, as well as a traction device 5, containing a trolley 6 with outriggers 7, racks 8, a traverse 9 and a pull beam 10 with grippers 11, 12, traction jacks 13 of cyclic action, bodies 14 and rods 15 of which are connected respectively to the traverse 9 and pull beam 10.

The device is equipped with a frame 16 mounted on the trolley 6, with which the hydraulic cylinders 17 for lifting the traverse 9 and the rack 8 are fastened. The racks are equipped with support platforms 18 for interacting with the traverse 9.

The method of construction of stressed reinforced concrete structures is as follows.

Produce the construction of the formwork, installation of channel formers 19 with supporting sleeves 20, concreting, pulling bundles of reinforcing strands through the channel formers using a traction device 5 and traction elements 4, followed by tension of the reinforcement bundles.

Before pulling the traction elements, the longitudinal axes 21 of the grips 11-12 of the traction device 5 and the support cup 20 are aligned with each other (figure 3) and the traverse 9 is moved before interacting with the support platforms 18 of the racks 8 (figure 4), and after pulling the anchor clips 1, 2 to the support sleeve 9 (Fig.5-6), the traverse 9 is moved to the surface of the frame 16, followed by pulling the anchor clips 1.2 from the support sleeve 20 to the required length, detaching the bundles of reinforcing strands 3 from the anchor clips for subsequent tension reinforcing bundles.

Due to the fact that the pulling jacks of the device are located vertically, it is not necessary to use guides for the pulling element. This reduces the forces on the traction device due to the lack of friction of the traction element in the guides, that is, the power and weight of the traction device can be reduced and the operating costs can be reduced.

Due to the vertical arrangement of the jacks, the area occupied by them decreases, and therefore the stroke of the jacks, given the height of the room, can be increased, which leads to an increase in the speed of transmission of bundles of reinforcing strands through curvilinear channel formers.

Thus, this technical solution will allow:

• improve device performance;

• reduce operating costs.

A source of information:

1. Patent RU 2567569, IPC E04G 21/12, E04C 5/10, 2014.

Claims (3)

1. A device for passing beams of reinforcing strands through curvilinear channel formers when creating prestressed reinforced concrete shells, including two anchor clips connected to each other with the possibility of rotation relative to each other, in the first of which bundles of reinforcing strands are fixed, and in the second - made in the form of a bundle of ropes a traction element, as well as a traction device containing a trolley with outriggers, racks, a traverse and a pull beam with grippers, traction jacks of cyclic action, the bodies and rods of which are connected to the traverse and the pull beam, respectively, characterized in that it is equipped with a frame mounted on the trolley, with which the hydraulic cylinders for lifting the traverse and rack are fastened. 2. A device for passing bundles of reinforcing strands through curvilinear channel formers according to claim 1, characterized in that the racks are equipped with support platforms for interacting with the traverse. 3. The method of construction of prestressed concrete structures using the device according to any one of paragraphs. 1, 2, including the construction of formwork, the installation of channel formers with support sleeves, concreting, pulling bundles of reinforcing strands through the channel formers using a traction device and traction elements, followed by tension of the reinforcement bundles, characterized in that before pulling the traction elements, the longitudinal axes of the grips of the traction device and the support sleeve are combined with each other and the traverse is moved until it interacts with the support pads of the posts, and after pulling the anchor clips to the support sleeve, the traverse is moved to the upper surface of the frame, followed by pulling the anchor clips from the support sleeve and detaching the bundles of reinforcing strands from the anchor clips.

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