RU121860U1 - PROTECTIVE SCREEN SECTION - Google Patents

Abstract

The proposal relates to construction, and in particular to devices related to tunneling or workings in loose rocks, namely to the creation of protective screens mainly when tunneling, pedestrian crossings, when crossing embankments of railways and highways, and other artificial structures. The result for which this technical solution is directed. consists in improving the sanitary-hygienic working conditions in the screen section while reducing the metal consumption of the process. The protective screen consists of a central 1 and side 2 sections, Section 1. 2 protective screens are made as follows: In pipes 3. 4 cut sector 5 to their entire length. The cutout of the sector is carried out within 90 ÷ 120 degrees. Next, the pipes are joined by welds 6, 7 in the places of cut-out sectors, thereby creating a single in-pipe space 8. Between the joints to ensure vertical stiffness of the section at the joints of the pipes, transverse stiffeners 9 are installed at a certain distance. At the joints of the pipes along the entire length, corners 10, 11 can be superimposed, connected to the tubers 3. 4 by a weld. After the device of the input and receiving pits (not shown in the drawings) near the obstacle to be crossed, the sections of the protective screen are pressed into the ground along the outer contour of the constructed permanent structure 12. First, crush the upper Central section 1. controlling the direction of indentation. Soil is removed from the section. Then produce stepwise. from different sides, punching the side sections 2 with the subsequent removal of soil from them. Indentation of sections is carried out with jacks. In each subsequent section, on the side of the previous one, the corners are welded, which are the locking-guiding devices 13. Before the next section is pushed, the sector 14 in the previous section is cut from its internal cavity by the size of the punching stage and the pushed section is installed in the above-mentioned cut-out. When this wall of the cutout is mated with a locking-guiding device 13. As the sector is cut out, stiffeners 15 are installed in the pipe with a certain step depending on the load acting on the section. After pressing the next section, the locking element is fixed and welded along the entire length. After completion of the indentation and soil removal works, technological holes are cut out in sections (not shown in the drawing) and the sections are connected through them with reinforcing cages and filled with concrete. The optimal cut-out sector in the pipes 3, 4 is α = 90 ÷ 120 degrees, which allows to obtain the optimal values of the area S, width B and height H of the section (zone B in FIGS. 5-7), providing the most comfortable working conditions for personnel inside sections of the protective screen. applying for the manufacture of sections of pipe of smaller diameter and thereby reducing the metal consumption of creating a protective shell and providing the possibility of using less powerful equipment.

Description

The proposal relates to construction, and in particular to devices related to tunneling or workings in loose rocks, namely to the creation of protective screens mainly when tunneling, pedestrian crossings, when crossing embankments of railways and highways, and other artificial structures.

There is a known technology for creating a protective screen known as the “Upgrade Pipe Roof Structure Method” (UPRS), which is used when driving a tunnel under the embankment by stepwise forcing pipe sections of the screen and excavating the rock from the squeezed section, and before cutting the next section, the sector in the previous section is cut out its internal cavity by the size of the stage of punching and set the punchable section in the aforementioned cutout, section of the protective screen is made in the form of a pipe [1].

The use of this technology helps to prevent deformation and subsidence of the surface and minimizes the impact of the construction and installation work on the urban and transport infrastructure, ensures safe construction, no interruptions in traffic and any restrictions on rail and road transport at the construction site of the facility.

With this method, it is required to carry out technological operations in the pipe (to cut the pipe sector and carry out welding work in it, remove the rock from the pipe, and so on). However, clause 17.4.3 of SNiP 12-04-2002 [2] limits the minimum diameter of the pipe of the sheath section (their internal area) for horizontal bursting of pipes in which the workers are. Therefore, it is necessary to use pipes of large diameter (at least 1.2 m), which leads to an increase in the metal consumption of the process of creating a protective shield, as well as to the need to use more powerful equipment during work.

The result, which this technical solution is aimed at, is to improve the sanitary and hygienic working conditions in the section, screen, while reducing the metal consumption of the process.

The specified result is achieved due to the fact. that the section of the protective screen, including the pipe, is equipped with at least one additional pipe, and the pipes are made with sector cuts within 90 ÷ 120 degrees, are fastened to each other along the walls of the cuts, and at the place of the cuts installed stiffeners .

The invention is illustrated by drawings, where in Fig.1 shows a protective screen, Fig.2 is a diagram of the process of crushing. figure 3 is a cross section of a section, figure 4 is a locking-guiding device, and Figs 5-7 are graphs showing the dependence, respectively, of the internal cross-sectional area, width and height, depending on the angle of the cut-out sector of the pipes of the sections of the protective screen (in this example for sections made of 1.02 m pipes.

The protective screen consists of a central 1 and side 2 sections.

Section 1. 2 protective shields are made as follows: In pipes 3, 4 cut sector 5 to their entire length. The cutout of the sector is carried out within 90-120 degrees. Next, the pipes are joined by welds 6, 7 in the places of cut-out sectors, thereby creating a single in-pipe space 8. Between the joints to ensure vertical stiffness of the section at the joints of the pipes, transverse stiffeners 9 are installed at a certain distance. At the pipe joints along the entire length, corners 10 can be superimposed 11. 11. connected to the pipes 3, 4 by a weld.

The construction of the protective screen is as follows.

After the device of the input and receiving pits (not shown in the drawings) near the intersected obstacle, the sections of the protective screen are pressed into the ground along the outer contour of the constructed permanent structure 12 (Fig. 1). First, crush the upper Central section 1. controlling the direction of indentation. Soil is removed from the section. Then produce stepwise, from different sides, the punching of the side sections 2 with the subsequent removal of soil from them. Indentation of sections is carried out with jacks.

In each subsequent section, on the side of the previous one, the corners are welded, which are the locking-guiding devices 13. Before the next section is pushed, the sector 14 in the previous section is cut from its internal cavity by the size of the punching stage and the pushed section is installed in the above-mentioned cut-out. When this wall of the cutout is mated with a locking-guiding device 13. As the sector is cut out, stiffeners 15 are installed in the pipe with a certain step depending on the load acting on the section. After pressing the next section, the locking element is fixed and welded along the entire length.

After completion of the indentation and soil removal works, technological holes are cut out in sections (not shown in the drawing) and through them the sections are connected together by reinforcing cages and filled with concrete.

The optimal cut-out sector in the pipes 3, 4 is α = 90 ÷ 120 degrees, which allows to obtain the optimal values of the area S, width B and height H of the section (zone B in FIGS. 5-7), providing the most comfortable working conditions for personnel inside sections of the protective screen, applying for the manufacture of pipe sections of smaller diameter and thereby reducing the metal consumption of creating a protective shell and providing the possibility of using less powerful equipment.

Thus, the proposed technical solution will allow;

- To improve the sanitary and hygienic conditions of personnel when working inside sections;

- Reduce the intensity of the creation of a protective shell;

- Apply less powerful equipment in the work.

Information sources

1. The prospectus of Anchor Technologies LLC. hup: //anchortech.ru/technology/rn-uprs.html, 2011

2. The State Committee of the Russian Federation for Construction and Housing and Communal Services (Gosstroy of Russia). Labor safety in construction, part 2, Construction, SNiP 12-04-2002, p.17: 4.3, Moscow 2003

Claims (1)

A section of the protective screen, including a pipe, characterized in that it is provided with at least one additional pipe, and the pipes are made with sector cuts within 90 ÷ 120˚, are fastened together along the walls of the cuts, and at the place of the cuts are installed with a distance of stiffeners from each other.