RU2296833C2 - Method for culvert laying under road embankment - Google Patents

Abstract

FIELD: culverts, particularly corrugated culverts to be laid under road embankments.

SUBSTANCE: method involves installing tubular case in embankment body; inserting corrugated pipe in the case; filling gap between inner surface of the tubular case and outer surface of the corrugated pipe with binding material. Tubular case is made as smooth tube and in installed by pressing it through embankment body by applying force of 15-40 tons per 1 meter of tubular case edge perimeter along with following ground removal from tubular case interior. Corrugated pipe is installed inside tubular case so that corrugated pipe is spaced from the tubular case. Gap between the tubular case and the corrugated pipe is filled with cement and sand grout or concrete supplied at 0.2-0.4 MPa pressure from gap top.

EFFECT: increased culvert strength and reliability and possibility of culvert laying without traffic interruption.

5 cl, 1 ex, 3 dwg

Description

The invention relates to culverts, in particular to corrugated culverts, and can be used when laying culverts under road embankments.

Known culvert under the road embankment, equipped with a tubular corrugated casing covering the body of the pipe with a gap that is filled with insulating material [and.with. SU 1010176, publ. 04/07/1983]. This design is not universal and is intended for use on permafrost soils.

Known culvert plastic pipe with double walls, which is an inner pipe inserted with a gap into the outer corrugated pipe and held therein with three trough-shaped longitudinal corrugations located at an angle of 120 ° [patent DE 3605329, publ. 06/01/1995]. Such a pipe has a complex structure and low strength.

It is known culvert structure under the embankment, containing a culvert metal corrugated pipe of circular cross section, placed in a closed flexible impermeable shell with a gap that is filled with a material with low internal friction [and.with. SU 1373745, publ. 02/15/1988]. This design has low reliability.

It is known to use corrugated pipes in culverts, for example with screw corrugations laid directly in the body of the embankment [as SU 1145072, publ. 03/15/1985]. The laying of such pipes can be done in a trench way or with a preliminary tunnel laying, which increases both the time and cost of construction. Meanwhile, other high-performance trenchless methods known for laying smooth-walled pipes are known. The most common is the method of punching, for example, punching pipes together with reinforced concrete lining [a.s. SU 1209778, publ. 02/07/1986], a tube-cartridge with a knife section [patent RU 2153581, publ. 07.27.2000] or using a temporary pipe [a.s. SU 1712548, publ. 02/15/1992], with the use of shock (hammering) [a.s. SU 802464 publ. 02/07/1981]. There are combined methods, for example, combining horizontal drilling with punching [application JP 52015114, publ. 02/04/1977].

In addition, the strength of the culvert corrugated pipe laid directly in the body of the embankment is relatively low, which requires the placement of additional reinforcing elements in the embankment, for example bars with uprights [a.s. SU 1752843, publ. 08/07/1992], which can additionally be equipped with rods [a.s. SU 1691451, publ. 11/15/1991].

In addition, a culvert corrugated pipe laid directly in the body of the embankment is more susceptible to corrosion than pipes with shells or casings, which determines a relatively short overhaul period, which increases operating costs. The prior art describes various methods for repairing culvert corrugated pipes directly in place, for example, repairing a vertically deformed pipe by sliding it with jacks and installing reinforcing elements in the form of arcuate pipe sections [a.s. SU 1276736, publ. 12/15/1986]. Another way to repair is to replace a damaged pipe, for example, laying a new pipe in the immediate vicinity of the old [patent RU 2183230, publ. 06/10/2002].

One of the known methods for repairing a culvert corrugated pipe directly at the place of its laying is selected as a prototype [patent CA 2252338, publ. 02/11/2003]. According to the known method, inside the repaired culvert corrugated pipe laid in the embankment and to be repaired, a repair corrugated pipe having a diameter slightly smaller than at the narrowest point of the repaired pipe is pulled with a winch. After installing the repair pipe, the gap between it and the pipe being repaired is filled with mortar. The known method is intended only for repair already laid in the embankment of culverts.

The technical task to be solved is to increase the strength and reliability of corrugated culverts, as well as to create a technology for laying such culverts without interrupting the movement of vehicles.

A culvert is proposed under a road embankment comprising a tubular casing with a corrugated pipe inside. The cavity between the inner surface of the tubular casing and the outer surface of the corrugated pipe is filled with a bonding material. What is new is that the tubular casing is made in the form of a smooth pipe made of a material with strength characteristics that allow it to be pressed through the body of the road embankment (i.e., without destruction or irreversible deformation).

The tubular casing is best made of metal, such as steel.

It is better when the tubular casing and / or corrugated pipe have a circular cross section.

Corrugated pipe can be made of metal or plastic.

Corrugations of a corrugated pipe are best performed with a screw.

As a bonding material, cement-sand mortar or concrete can be used.

Corrugated pipe can be installed inside the tubular casing with a gap.

A method for laying a culvert under a road embankment is also proposed, according to which a corrugated pipe is installed in a tubular casing installed in the body of the road embankment, after which the cavity between the inner surface of the tubular casing and the outer surface of the corrugated pipe is filled with fastening material. New is that a tubular casing in the form of a smooth pipe is installed by forcing it through the body of the road embankment. In this case, any of the known pressing methods can be used, for example, those described above.

The gap cavity can be filled with cement-sand mortar or concrete.

Corrugated pipe can be installed inside the tubular casing with a gap.

The invention is illustrated by drawings, which shows the main stages of laying under a road embankment of a culvert corrugated pipe: figure 1 shows the stage of forcing an external smooth pipe; figure 2 - stage of pulling the inner corrugated pipe; figure 3 is the final stage. The arrows in FIG. 1 and FIG. 2 show the direction of the forcing and pulling force, respectively.

The invention is illustrated by the example of laying a culvert corrugated pipe under an existing road embankment (road or rail).

In the body of the embankment 1, the casing 2 is pressed through in the form of a smooth metal pipe (see figure 1). Punching can be carried out by any of the known methods. The soil of the embankment is removed from the cavity of the casing 2, into which a metal or plastic corrugated pipe 3 is then pulled (see FIG. 2), for example, using a winch. The gap 4 between the casing 2 and the pipe 3 is filled with cement-sand mortar or concrete under pressure. The gap 4 is filled by means of a pump through a concrete duct placed in the arch between the casing 2 and the corrugated pipe 3. An end formwork (not shown) is mounted on the output end of the casing 2. The filling of the gap 4 begins with the output tip. As the concrete conveyor fills, it moves to the inlet head. After filling the gap 4 through the bolt holes in the arch part of the corrugated pipe, a hole is drilled with a diameter of 20 mm to the casing. Through this hole, cement is injected. The filling of the voids can be carried out through technological holes in the corrugated pipe 3. On both sides of the finished culvert, heads can be mounted.

The present invention has been successfully tested for embankments in soils of categories I-IV during the conversion of the Sakhalin railway to the national gauge of 1520 mm, with overhaul of culverts at km 122, 124, 168, 162, 164 on the Kholmsk-Ilyinsk line. Wherein:

- the forcing forces (press, microboards) were 15-40 tons per 1 m of the perimeter of the edge of the casing 2, which were used steel pipes D _y = 1880 mm with a wall thickness of 16-20 mm;

- as corrugated pipes, pipes with screw and concentric corrugations with a rectangular trapezoidal and rounded corrugated cross-section of corrugations were used, having an outer diameter (along the protrusions) of 1602 mm, an inner diameter (along the hollows) of 1500 mm, a corrugation pitch of 152.4 mm, the width of the corrugations in cross section of 1430 mm;

- filling (with mortar or concrete) of the gap 4 was carried out under a pressure of 0.2-0.4 MPa, the voids were filled through holes in a corrugated pipe 3 with a diameter of 20 mm, made with a step of 2 m in length;

- the total casing laying time, depending on the length of the pipe, ranged from 3 to 10 days without interruption in the movement of trains.

The above example and data are used only to illustrate the possibility of carrying out the invention and in no way limit the scope of legal protection presented in the claims, while a person skilled in the art is relatively simple to implement other ways of carrying out the invention.

Claims (5)

1. A method of laying a culvert under a road embankment, according to which a corrugated pipe is installed in a tubular casing installed in the body of the road embankment, after which the cavity between the inner surface of the tubular casing and the outer surface of the corrugated pipe is filled with a bonding material, characterized in that the tubular casing is the form of a smooth pipe is established by forcing it through the body of the road embankment with an forcing force of 15-40 tons per 1 m of the perimeter of the edge of the tubular casing with subsequent removal Runt road embankment cavity of the tubular casing, the corrugated tube positioned within the tubular housing with a gap, and the gap cavity is filled with a cement-sand mortar or concrete, which is fed under pressure of 0.2-0.4 MPa from the crest of the gap. 2. The method according to claim 1, characterized in that they use a corrugated pipe with screw corrugations. 3. The method according to claim 1, characterized in that before filling the gap cavity on one of the heads of the tubular casing, an end formwork is mounted, and the gap cavity is filled in the direction from this tip. 4. The method according to claim 1, characterized in that the filling of the gap cavity is performed using a concrete duct placed in the arch between the tubular casing and the corrugated pipe. 5. The method according to claim 1, characterized in that the gap cavity is filled through holes in the corrugated pipe.

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