SU808602A1 - Installation for laying concrete under water - Google Patents

Description

The invention relates to construction and can be used in hydraulic engineering and transport construction, for example, in the construction of moorings, breakwaters, foundations for lighthouses, bridge supports, etc.

By main auto No. 706493 known installation for underwater concreting, including a vertically movable pipe, for supplying concrete mixture, equipped with a protective screen in the lower part, which is paired with the surface of the pipe with the possibility of its movement in the vertical direction along the pipe, limited by stops mounted on its surface, while the screen is equipped with air compartments providing its positive buoyancy with respect to the concrete mixture to be laid and negative buoyancy with respect to * water [£ 1]. .

The disadvantage of this device is „with partial washing out of cement from the concrete mix with water contained in a vertical pipe before concreting. In some cases, when a very high strength and density of concrete is required, such a installation does not 30 achieve the desired results, as a result of which it is necessary to use more expensive grades of concrete with a high cement content.

The purpose of the invention is to increase the strength and density of concrete by eliminating the leaching of cement from the concrete mixture in the initial period of concreting.

^υ This goal is achieved by the fact that the installation for underwater concreting is equipped with a stopper-distributor made in the form of a spherical segment with conical fairings 15 in the upper and lower parts, which is installed in the lower part of the protective screen coaxially with the vertical movable pipe, and the protective screen is equipped with mounted vibrators.

Figure 1 shows the installation in the initial position, a longitudinal section; figure 2 - installation in the process.

The installation includes a vertically movable pipe 1, which is equipped with a protective screen 2 in the lower part. The pipe 1 is placed inside the formwork 3, fixed at the bottom of the reservoir. The screen 2 is associated with the surface of the pipe 1 with the possibility of its movement in the vertical direction along the pipe 1..

On the screen housing 2 reinforced stops -

4, and on the surface of the pipe 1 - stops

5, which are equipped with rubber o-rings (not shown). j

Vibrators' 6 are mounted on the screen 2, and to the lower part coaxially with the pipe 1 is attached, by means of vertical ribs 7, a plug-distributor 8 made in the form of a spherical segment 9 θ with fairings 10 and 11. For the possibility of alignment of the position of the screen 2 during distortions, it equipped with a rope suspension 12. ·

The screen 2 is also equipped with air compartments 13, which provide its positive buoyancy relative to the concrete mix and negative buoyancy relative to water. Installation works as follows. 20

In the initial position, before concreting, the screen 2 is at the bottom of the reservoir, the pipe 1 is tightly pressed to the spherical segment 9 of the plug-distributor 8 and sealed with it. Ball 25 shape of segment 9 facilitates the coupling of the pipe 1 with the stopper-distributor 8 and increases the reliability of the seal Water is pumped out from the cavity of the pipe 1, after which the cavity of the pipe 1 is filled with concrete mixture. Then the pipe 1 is raised until the stops 5 of the pipe 1 interact with the stops 4 of the screen 2, the vibrators 6 are turned on, and the concrete mix begins to fill the space between the bottom of the reservoir, the formwork 3 and the lower surface of the screen 2. Water and air are squeezed out of this space through the gaps between the formwork 3 and the screen 2, and also between the pipe 1 and the screen 2. 40

Due to the presence of the plug-distributor 8, the incoming concrete mix immediately enters the active vibration zone and is compacted. The conical fairing 11 provides uniform distribution of the concrete mixture around the circumference and reduces the drag of the cork-distributor 8 in the stream of concrete mixture. As the cavity under the screen 2 is filled with concrete mixture, the latter begins to emerge, the hole in the lower part of the pipe 1 gradually overlaps. The conical shape of the lower cowl 10 facilitates the ascent of the screen 2 in the environment of a viscous material.

The cessation of receipt of the concrete mixture is a signal for lifting the pipe 1 again before the interaction of the stops 5 and 4, after which the concrete mixture continues to flow under the screen 2, etc. Concreting continues with the cycles described above until the formwork 3 is completely filled with concrete.

Claims (2)

The invention relates to the construction and can be used in hydraulic engineering and transport construction, for example, in the construction of moorings, breakwaters, foundations under the macaques, bridge supports, etc. According to the main auth. No. 706493 is a well-known installation for underwater whitening, including a vertically movable pipe, for feeding a concrete mixture, provided with a protective screen in the lower part, which is coupled with the surface of the pipe and can be moved in the vertical direction along the pipe limited by rests mounted on its surface. / at the same time, the screen is equipped with air compartments - providing it with intercoupling buoyancy relative to the concrete mix to be laid and the negative buoyancy relative to water | l3. The disadvantage of this device is the partial leaching of cement from the concrete mixture with water contained in a vertical pipe before concreting. In a number of cases when the strength and density of concrete are very high, such an installation does not allow to achieve the desired results, as a result of which more expensive concrete grades with a higher cement content must be used. The purpose of the invention is to increase the strength and density of concrete by eliminating the leaching of cement from the concrete mix during the initial period of concreting. This goal is achieved in that the installation for underwater concreting is equipped with a distributor plug made in the form of a spherical segment with conical fairings in the upper and lower parts, which is installed in the lower part of the protective screen coaxially with a vertical movable pipe. vibrators. Figure 1 shows the installation in the initial position, a longitudinal section; figure 2 - installation in the process. The installation includes a vertically movable pipe 1, which is provided with a protective screen 2 at the bottom. The pipe 1 is placed inside the formwork 3 fixed at the bottom of the reservoir. The screen 2 is connected with the surface of the pipe 1 with the possibility of its movement in the vertical direction along the pipe 1. The stops 4 are fixed on the screen case 2, and the stops 5 are fixed on the surface of the pipe 1, which are equipped with rubber sealing rings (not shown). On the screen 2, the vibrators are fixed to the lower part, coaxially attached to the pipe 1 by means of the vertical ribs 7 with a dispensing plug 8, made in the form of a spherical segment 9 with fairings 10 and I. To possibly align the position of the screen 2 at tilts, it is provided with a cable suspension 12. The screen 2 is also equipped with air compartments 13, which provide its positive buoyancy relative to the concrete mix being laid and negative buoyancy relative to water. The installation works as follows. In the initial position before concreting, the screen 2 is at the bottom of the reservoir, the pipe 1 is tightly pressed against the spherical segment 9 of the distributor plug 8 and sealed with it. The ball shape of segment 9 facilitates mating of pipe 1 with distributor plug B and improves the reliability of the seal. Water is pumped out of the cavity of pipe 1, after which the cavity of pipe 1 is filled with concrete. Then the pipe 1 is lifted up to the interaction of the stops 5 of the pipe 1 with the stops 4 of the screen 2, the vibrators 6 are turned on, and the concrete mix begins to fill the space between the bottom of the reservoir, the formwork 3 and the bottom surface of the screen 2. Water and air are pressed out of this space through the gaps between the formwork 3 and the screen 2, as well as between the pipe 1 and the screen 2. Due to the presence of the plug-distributor 8, the incoming concrete mix immediately falls into the zone of active vibration and seals. The conical fairing 11 ensures uniform distribution of the concrete mix around the circumference and reduces the drag of the distributor plug 8 in the flow of the concrete mix. As the concrete mixture fills the cavity under the screen 2, the latter begins to float, the hole in the lower part of the pipe 1 gradually overlaps. The conical shape of the lower flap 10 facilitates the ascent of the screen 2 in an environment of viscous material. In this case, stopping the entry of the concrete mix is a signal for lifting pipe 1 again until the contacting of lugs 5 and 4, after which the concrete mix continues to flow under screen 2, and so on. Concreting continues with the cycles described above until the formwork 3 is completely filled with concrete. The invention The installation for underwater betonirovani avt.st. 706493, characterized in that, in order to increase the strength and density of concrete, it is provided with a cork dispenser made in the form of a spherical segment with conical fairings in the upper and lower parts, which is installed in the lower part of the Ssitsitny screen coaxially with a vertical movable pipe, and the protective screen is equipped with vibrators mounted in it. Sources of information taken into account during the examination 1. USSR author's certificate No. 706493, cl. E 02 O 15/06, 07.07.78.