KR20030013136A - Apparatus for reducing of friction - Google Patents

Abstract

PURPOSE: A friction damping device is provided to reduce construction expenses by decreasing tractive force. CONSTITUTION: The friction damping device comprises: a rotary body(21) installed on a structure body(10) and fixed on the upper end of the body(10); a roll band(20) wound/folded around the rotary body(21) and placed on the body(10); many steel bars(22) interposed between the folded roll bands(20); and a lubricant(23) filled between the folded roll bands(20).

Description

Friction damping device {APPARATUS FOR REDUCING OF FRICTION}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a friction damping device applied to a front jacking method, and more particularly, to a friction damping device that reduces friction between the upper end surface of a housing and the ground, thereby facilitating the penetration of the body.

In general, the front jacking method is one of the non-removable methods for installing structures in the basement without attaching the ground. Towing the cables and the front jockeys to the structure enclosures manufactured outside or inside the tunnel without removing soil from the front It is a construction method for constructing a structure at a predetermined position. The front jacking method is a method of press-fitting a sheared precast concrete structure to a predetermined position in the ground without installing a reaction wall, and does not require a large-scale facility such as a shielding method, and uses an open-laying method or a site-casting concrete method by a supporter. As such, it is a method that does not remain unstable for a long time.

Looking at the process of the conventional front jacking method with reference to Figures 1a to 1c as follows.

First, the oscillation gang 30 is constructed at the beginning position of the construction section where the underground structure is to be installed, and the reaching gang 40 is constructed at the end position. The oscillation gang 30 has a space in which the structure enclosure 10 is to be placed or a space for installing the enclosure 10 and the oscillation table 2 is secured. Provide space for installation.

The structure enclosure 10 may be manufactured on the outside and seated in the oscillation shaft 30, or may be fabricated on the production table and the oscillation table 2 in the oscillation shaft 30.

The structure housing 10 to be installed in the basement of the ground set as the construction section is a box-shaped concrete structure, which is usually towed in the ground of the construction section, and the housing 10 has a plurality of pipes penetrating in the longitudinal direction. It is produced in a buried state.

In the pipe, a plurality of cables (6) are fixed to the front jockey (5) installed in the arrival shaft (40) and hit a hole formed in the basement of the construction section, and the inserted cable is anchored (3) at the rear end of the enclosure (10). Is fixed by. Therefore, the enclosure 10 enters the basement of the construction section ground by towing the cable 6 of the hydraulic cylinder and the front jockey 5 installed in the arrival shaft 40.

Population 1 (刃口) is connected to the front portion of the housing 10, and performs the function of excavating the surrounding soil when towing the housing 10 so that the housing 10 is easily towed. The population 1 is configured to have sufficient rigidity to withstand the surrounding earth pressure, and can be configured in multiple stages according to a given situation. The soil excavated by the population 1 is discharged to the oscillation gang 30 side through the interior of the housing 10.

The oscillation table 2 also serves as a manufacturing table of the enclosure 10, and the oscillation direction of the enclosure 10 is determined according to the direction in which the oscillation table 2 is placed, so that the oscillation direction is accurately adjusted to provide sufficient bearing force. It is constructed on the ground to have.

The fixing unit 3 fixes and supports the cable 6 inserted into the tube embedded in the enclosure 10 to the rear end of the enclosure 10 to pull the enclosure 10.

The reaction body 4 is a kind of support as a structure. When the enclosure 10 is connected to the cable 6 and towed by the hydraulic cylinder and the front jockey 5, the force is efficiently transmitted to the enclosure 10, and the cable 6 is connected to the towed enclosure 10. Apply a reaction force so that the cable (6) does not come loose.

Looking at the specific construction process, first, the housing 10 having a population (1) is placed on the oscillation table (2) of the oscillation inlet. A plurality of cables 6, one end of which is fixed to the front jockey 5 of the reaching shaft 40, passes through a hole previously formed in the basement section of the construction section, and is inserted into a tube embedded in the enclosure 10 to receive the enclosure 10. It is installed to be fixed to the fixing unit 3 at the rear end (Fig. 1A). By pulling the cable 6 connected to the front jockey 5 by the hydraulic pressure of the hydraulic cylinder, the enclosure 10 is introduced into the ground (FIG. 1B). Completely towing the enclosure 10 to position the enclosure 10 in a predetermined position, after filling the enclosure 10, and removing the peripheral equipment to complete the penetration (Fig. 1c).

However, the operation of injecting the enclosure 10 into the gang by the conventional front jacking method generates a considerable resistance to the hydraulic cylinder due to the friction between the upper portion of the enclosure 10 and the ground 9, and thus the enclosure 10 Since a large number of hydraulic cylinders or large-capacity hydraulic cylinders are required to obtain the propulsion force, the installation of a large number of auxiliary facilities and the increase in cost thereof are caused for the penetration of the enclosure 10.

Accordingly, an object of the present invention is to provide a device for friction damping to reduce the friction between the housing and the ground during construction of the front jacking method to facilitate the penetration of the housing. .

1a to 1c is a construction process diagram of a conventional front jacking method.

Figure 2a to 2c is a configuration of the apparatus for friction damping according to the present invention and a construction process diagram using the same.

* Explanation of symbols for the main parts of the drawings

10: enclosure 20: roll band

21: rotating body 22: steel bar

23: lubricant

The present invention for achieving the above object, relates to a friction damping device used in the front jacking method, the rotating body is installed on the upper surface of the structure housing 10 and fixed to the upper end of the housing 10; A roll band wound around the rotating body and folded to be placed on an upper surface of the housing 10; A plurality of steel rods inserted between the folded roll bands; And a lubricant filled between the folded roll bands.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 2A to 2C.

Figure 2a to 2c is a construction process diagram of the front jacking method using a friction damping apparatus according to the present invention, 20 is a roll band, 21 is a rotating body, 22 is a steel bar, 23 is a lubricant.

As shown in the drawings, the friction damping device according to the present invention includes a rotating body 21 which is installed on the upper surface of the structure enclosure 10 when the front jacking method is performed and is fixed to the upper end of the enclosure 10; The roll 21 includes a roll band 20 wound around the rotor 21 and folded to rest on the upper surface of the housing 10. In addition, a plurality of steel rods 22 inserted between the folded roll band 20 and a lubricant 23 filled between the folded roll band 20.

The rotating body 21 is a kind of fixed roller, which is fixed to the upper end of the housing 10 and forms a plurality of protrusions on the circumferential surface. The rotating body 21 is installed to rotate the roll band 20 when entering the ground of the housing 10.

The roll band 20 which is folded and placed on the upper part of the enclosure 10 with the turning body 21 as a turning point has a band shape having a predetermined width, and the upper surface and the ground of the enclosure 10 when the enclosure 10 enters. It rotates by the friction force between (9) and functions to reduce the friction applied to the enclosure 10 while one side is rolled up, and is composed of synthetic resin or metal having a certain strength. Roll band 10 may be provided with one or more depending on the tensile strength of the material, the width of the enclosure (10).

A plurality of steel bars 22 inserted between the folded roll bands 20 are rolled to reduce the friction between the enclosure 10 and the bands 20 when the enclosure 10 is inserted into the ground. In order to smoothly roll the steel rods 20, the folded space of the roll band 20 is filled with a lubricant 23, and the lubricant 23 uses a conventional lubricant such as bent night.

Referring to the operation of the friction damping device according to the present invention having the above components as well as the construction process as follows.

When the structure enclosure 10 is settled in the oscillation shaft 30, the rotating body 21 is installed at the tip of the upper surface. The roll band 20 is placed on the upper surface of the enclosure 10 in a state of being folded around the rotating body 21. At a predetermined interval, a plurality of steel bars 22 are arranged between the roll bands 20 folded in the width direction of the housing 10 and a lubricant 23 is filled between the steel bars 22 (see FIG. 2A).

Then, the hydraulic cylinder and the front jockey 5 are operated in the arrival shaft 40 to pull the enclosure 10 into the ground, and the tip of the enclosure 10 is partially inserted into the ground by excavation of the soil 1. In this case, a portion of the roll band 20 which is folded on the upper surface of the enclosure 10 is not moved by friction, and a portion of the roll band 20 that is in contact with the upper surface of the enclosure 10 is rolled up like the enclosure 10. At this time, the rotary body 21 and the plurality of steel rods 22 to roll the roll band 20 smoothly while rotating in the counterclockwise direction.

Therefore, the friction between the ground and the upper surface of the housing 10 is significantly reduced by the roll band 20 rolled up by the plurality of steel rods 22 and the rotating body 21, and the housing 10 up to the reach shaft with a small pulling force. Can be easily towed (see Fig. 2b).

When the towing of the enclosure 10 is completed, the auxiliary equipment installed in the reaching shaft 40 is removed to tow the enclosure 10, and the outer circumference of the enclosure 10 is backfilled.

Since the roll band 20 protruding from the rear end of the enclosure 10 is difficult to remove between the enclosure 10 and the ground, the roll band 20 is cut and finished (see FIG. 2C).

Therefore, the present invention made as described above, by reducing the friction force of the ground and the body acting on the upper body during the construction of the front jacking method it is possible to tow the enclosure with less traction force than the conventional can reduce the construction cost by reducing the traction force In addition, it has an excellent effect that can be applied to the ground where the construction was impossible, such as the ground where the friction was large, or the ground where a large amount of auxiliary facilities could not be installed.

Claims (2)

In the friction damping device used in the front jacking method, A rotating body installed on an upper surface of the structure enclosure and fixed to an upper end portion of the enclosure; At least one roll band wound and folded around the rotating body and placed on the upper surface of the enclosure; A plurality of steel rods inserted between the folded roll bands; And Lubricant Filled Between the Folded Roll Bands Friction damping device, characterized in that consisting of. The method according to claim 1, The rotating body is a friction damping device, characterized in that consisting of a fixed roller protruding a plurality of projections on the outer peripheral surface.