RU2335595C2 - Device for continuous cutting expansion joint in as-laid concrete - Google Patents

Abstract

FIELD: mechanics.

SUBSTANCE: device for cutting expansion joint incorporates light-weight cutting knife 1, damping knife 2 with an elastic element representing sheet rubber 3 corresponding to the cutting knife thickness, load plate 4 with the chamfer-forming elements, the aforesaid elements making an integral design component with a funnel-type truncated-pyramid-shaped tank 5 to house the graved 6 of 6-10 mm grain size. Front light-weight cutting knife 1 is furnished with a skew cutting edge and a hole closed up on both sides by a thin sheet. Note that weld seam of the sheets in pos. 7 should, further on, be made equal to the knife thickness. The cable drum in casing 8 representing the highest point of the device is connected to the power drive via logging cable 9. the said cable is permanently tensioned by means of a hydraulic coupling and allows the device to move in the working zone to wind up and off the cable in the drum.

EFFECT: higher-quality expansion joint, higher efficiency and greater vibration amplitude.

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Description

The acquisition relates to the construction of concrete dams of hydraulic structures, as well as to airfield and road construction.

A device for cutting seams in a freshly laid concrete layer of airfield and pavement with the simultaneous laying roofing and other gaskets in the seams, containing a vibrating knife with a sawtooth lower cutting edge / 1 /.

The disadvantage of this device is the impossibility of continuous cutting of the seam and its shallow depth.

A device for forming a seam in a freshly laid concrete coating mounted on a movable carriage and containing a vibrator and a knife movable to the latter by means of a shock absorber, on both sides of which are mounted smoothing skis that can be moved in the vertical and horizontal planes and made of elastic material, for example rubber / 2 /.

The disadvantage of this device is the low efficiency due to the impossibility of cyclic cutting of the seam from top to bottom, which is necessary when deepening the knife at the initial moment of cutting with layer-by-layer concreting.

A device is known for continuously cutting a temperature joint in freshly laid concrete, mainly during the construction of hydraulic structures, comprising a frame, a drive carriage, on a supporting platform of which a vibrator and a cutting knife with a lower cutting edge are mounted, a loading plate and a damper with an elastic membrane, the device is equipped with an additional drive carriage with a vibrator, on the supporting platform of which a damper is mounted, made in the form of a sickle-shaped knife covering the elastic membrane of the casing m, having pressure rollers and vertical guides in which both carriages are installed, the cutting knife is made with a sawtooth edge on the front vertical end, with a groove on the opposite, in which the front edge of the damper blade is located along which the pressure rollers are in contact with the cutting knife and a damper blade, and the loading plate is equipped with triangular chamfers and parallel rods, through which it is connected to the frame and is made by a longitudinal slot along which bottom are placed chamfering, moreover, the side walls of the casing have holes with clamps placed in them, and the damper blade is equipped with brackets with adjusting rods fixed to the loading plate / 3 /.

The disadvantage of this device is that as a result of vibration exposure to the freshly laid concrete, the seam is deformed in places, losing flatness, and some vibro-living places swam from above. In addition, the front cutting concrete knife is massive, due to which a significant part of the energy is spent on the mass of the knife itself. Tests of the device for cutting a seam showed that cable cabling of electricity on a concrete surface is inefficient, concrete cars often run over, and sometimes the device itself ran over a cable.

The aim of the invention is the preservation of a full-fledged temperature seam during layer-by-layer concreting of hydraulic structures, the efficiency of cutting the seam, reducing the mass of the cutting body and providing more reliable electrical wiring and longer uptime of the device.

This goal is achieved by the fact that at the rear end of the loading plate and the chamfer attached to it, a funnel-shaped truncated pyramidal through container is attached, the axis of symmetry of which coincides with the axis of symmetry of the device. The lower truncated part of the pyramid-container has a rectangular neck with a width of the size of the cut seam, and a length of 1.5-2 times greater than the width, as a result of which a container filled with granular gravel 6-8-10 mm, acting like an hourglass, automatically fills just cut seam to the very top, i.e. as the weld is formed, placing at the same time and creating an air void, it fills it by injection with high-strength cement milk under high pressure, as a result of which the entire concrete mass of the dam becomes monolithic.

And the front cutting knife is made inclined and lightweight, with a hole that is sealed on both sides with thin sheets of 4, 5 mm, and the welding is aligned with the thickness of the cut knife.

The electrical supply of the device is carried out by a logging cable through the highest point of the device - cable laying drum with current collectors. The cable is fixed at the drum level for columns, racks, walls, rocky shores, etc.

What is new is that at the rear end of the loading plate with chamfers, a funnel-shaped truncated pyramidal tank is attached with a rectangular bottom through hole equal in width to the width of the seam and 1.5-2 times longer in length along the seam. So that in the transport position of the device the truncated pyramidal container from granular gravel is not emptied, the hole is closed with a rectangular stopper-gate using a lever system. The front cutting knife is made lightweight, obliquely beveled, and a hole is made in the inner cavity, which is sealed on both sides with a thin sheet of 4.5 mm in the size of the knife thickness with alignment of welding. Power is supplied by wireline cable by means of a drum cable-laying machine with ring current collectors, which is in constant tension by the presence of a fluid coupling, at which the device can be approached, and move away from the cable tie.

Figure 1 shows a device for continuous cutting of the temperature joint in freshly laid concrete;

figure 2 is a section along aa, a transverse section of a truncated pyramidal tank and a seam filled with granular gravel;

figure 3 - seam, covered with granular gravel, according to BB.

A device for continuous cutting of the temperature joint in freshly laid concrete contains a lightweight cutting knife 1, a soothing knife 2 with an elastic element in the form of sheet rubber 3, corresponding to the thickness of the cutting organ - knife, a loading plate with chamfer 4, a truncated pyramidal / funnel / shape capacity 5 / the rectangular bottom gate and the lever drive to it are not shown in the drawing / in which granular gravel 6 is enclosed / located. The front cutting knife 1 is made lightweight with an opening in the cavity in which sheets of 7 mm are attached on both sides of 4 mm, and welding is aligned to the size of the cutting knife. The cable drum in the casing 8, which is the highest point of the seam cutting device, is connected by a logging cable 9, attached to the elements of the constructed dam at the level of the drum. The logging cable is always tensioned using a fluid coupling, which provides freedom of movement for the device without any restrictions.

Technical and economic indicators of the proposed technical solution are as follows:

- the temperature seam is obtained of higher quality and as a result of automatic filling of the seam with granular gravel, the seam becomes prepared for the production of dam monolithing with high-strength cement milk;

- a cable drum, providing tension using a fluid coupling driven by an electric motor, improves the conditions for safe work;

- due to the facilitation of the front cutting organ / knife / the amplitude of the oscillations increases and, accordingly, the impact of the knife on concrete.

Information sources

1. USSR Copyright Certificate No. 86119, cl. E01C 09/23, 1949.

2. Copyright certificate of the USSR No. 237922, cl. E01C 11/02, 1968.

3. USSR copyright certificate No. 653323, cl. E01C 23/02, 1976.

Claims (1)

A device for continuous cutting of the temperature joint in freshly laid concrete, containing cutting, soothing knives, mounted on carriages with vibrators on vertical guides, a loading plate with chamfer, characterized in that a funnel-shaped container for granular gravel 6-10 mm is attached to the tail of the loading chamfer plate in the form of an inverted truncated pyramid with a through rectangular shutter-shaped bottom hole, the cutting knife is made lightweight with a hole and a bevel with a leading edge, while sheets are fixed on both sides in the knife hole by welding, the welding places are aligned with the thickness of the knife sheet, in addition, a cable drum is attached to the device in the upper part in a casing with current collectors and a drive from the fluid coupling.

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