KR960005715Y1 - A messer shield structure - Google Patents

Abstract

None.

Description

Underground shielding method

1 is a perspective view of the present invention shield

FIG. 2 is a rear view of FIG. 1

Figure 3 is a vertical cross-sectional view of the propulsion unit showing the connection state between the invention shield

4 and 5 are conventional structures, the corresponding views of FIGS.

6 is a state diagram of the use of the method shield during underground excavation.

* Explanation of symbols for main parts of the drawings

1 hood part 1a top plate

2 propulsion unit 3 lower plate

3a: propulsion hanger groove 4: erum plate

4a: top member 5: inclined plate

6: connecting plate 7: tail

8: vertical reinforcing plate

The present invention relates to a shield used for starting underground excavation, such as a tunnel, in particular, a ground shielding method that facilitates ground input of the hood part, reduces the propulsion friction force at the connection part of the propelling parts, and also strengthens the corresponding bending deformation resistance of the tail part. It is about.

In general, the Messer Shield method, which is constructed when underground excavation of tunnel curtains, arranges the shields in parallel on the support fabricated according to the tunnel shape, and then each method shield (A) as shown in FIG. As a method of excavating the membrane while pushing the valves one by one into the hydraulic propeller 29 and holding the earth plate 30 on the excavation surface 31 behind the method shield A, it is supported by the support material 32. As a method shield A, there is one proposed by the present applicant in Utility Model Registration Application No. 83-2130.

That is, the conventional ground excavation shield, which has been proposed, is formed as a blade as shown in FIG. 5, the hood portion 101 press-fitted into the ground and the propulsion portion having a constant thickness inclined with the hood portion 101. Two quadrangular steel plate cylinders 109a and 109b, which consist of a tail portion 107 formed with a recess 102 to be hooked at right angles to the propulsion portion 102 so that the earth plate 30 can be caught, The lower sheath provided with the epithelial cladding plate 110a and the propulsion hanger groove 103a of the hydraulic propeller 29 by the fixed angle plate 110 fixedly attached to face one outer surface of each of the four square steel plate cylinders 109a and 109b. The steel sheet 110b had a structure in which the curvature was adjusted.

However, since the front end of the hood 101 has a quadrilateral plate shape, such a conventional shield structure receives a lot of indentation resistance between the ground and the propulsion unit 102 when drilling the membrane. The connecting portions 104a protruding from one side of each of the 44 angular steel sheet cylinders 109a and 109b are arranged to be interlaced with each other, so that a large amount of frictional force is generated in the contact surface properties of the connecting portions 104a during membrane digging. There is a drawback that the membrane refraction rate is reduced, and the tail portion 107 is a thin square plate having a thin thickness, so that bending deformation is easily caused by the soil pressure, resulting in damage to the method shield itself.

Therefore, the present invention was devised to solve the above-mentioned shortcomings, and the front end of the hood part received less indentation resistance, and also received less propulsion resistance friction force in the coupling part of the propelling part, It is also an object of the present invention to provide a method for underground excavation, which is to enhance the flexural deformation efficiency by increasing the flexural deformation resistance.

In order to achieve the above object, the present invention has a wedge shape with a sharp front end of the hood part, and the erecting plates having a L-shaped cross section facing each other at regular intervals on the left and right sides of the lower plate having the propelling hanger grooves. While being mounted so as to be interconnected and supported by the inclined plate and the connecting plate while the tail portion is to have a cross-sectional shape of the vertical reinforcement plate is integrally disposed.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a perspective view and a rear view of the method shield of the present invention, respectively, in which the front end of the upper plate 1a is connected to the rear of the hood portion 1 which has a sharp wedge shape, along the axial direction in the center thereof. A lower plate 3 having a plurality of propelling hook grooves 3a formed at regular intervals and the lower plate 3 are vertically fixed with the propelling hook grooves 3a interposed therebetween so that the cross section is shaped like a third. A propulsion part consisting of a standing plate 4, an inclined plate 5 positioned outside the standing plate 4 to support the top member 4a, and a connecting plate 6 connecting the upper end of the standing plate 4. (2) is coupled to the rear of the propulsion unit 2, the vertical reinforcing plate 8 is mounted in the vertical direction along the central axis of the lower surface is a structure in which the tail portion (7) having a cross-sectional shape is combined. have.

Here, the hood part 1, the propulsion part 2, and the tail part 7 are arranged so that the upper surface thereof forms a step by step, while the standing plate 4 in the propulsion part 2 is The end of the upper member 4a extends outward from the inclined plate 5 by a predetermined length.

In addition, the connection between each shield is made by placing two alternating shields (a, a ') having different heights of the uprights (4, 4') at the time of construction, and placing them alternately. 4a, 4a ') only when the ends overlap the upper and lower, the connection is made.

According to the present invention method shield (a) described above, the front end of the hood portion (1) is wedge-shaped, easy to press into the target ground, the upper plate (4a, 4a ') of the riser plate of the propulsion unit (2). By connecting the ends of the cross-section in planar contact with each other in the excavation direction, the propulsion resistance friction force at the connection of adjacent mass shields (a, a ') is reduced, while the tail portion (7) is supported by the vertical reinforcing plate (8). By reinforcing the bending rigidity of), the excavation operation can be performed with a small force, and the damage caused by the bending deformation of the tail portion is greatly reduced.

Claims (2)

In the ground excavation method, which comprises a hood portion press-fitted into the ground, a propulsion portion inclined to the hood portion and having a constant thickness, and a single-layered perpendicular to the propulsion portion, the earth plate is caught and the tail portion is provided. The front end of the hood part 1 is formed in a sharp wedge shape, and the propelling part 2 is disposed on both sides of the propulsion hanger grooves 3a formed in a line at a predetermined interval along the axial direction at the center of the lower plate 3. A vertically welded " a " shaped umbilical plate 4 and the horizontal top member 4a of this umbilical plate 4 on the outside of the umbilical plate 4 are supported by a predetermined length. It consists of a connecting plate (6) for supporting the upper end of the upright plate (4) coupled to extend, the tail portion (7) is a vertical reinforcing plate (8) in the vertical downward direction along the centerline on the lower surface Underground digging mass shield, characterized in that the fixed installation. 2. The method according to claim 1, wherein the method shield is made of method shields (a, a ') having different heights of the uprights (4, 4') of the propulsion unit (2). The uprights of the upright plates (4, 4 '), the ends of the upper members (4a, 4a') are arranged so that they can be interconnected by overlapping up and down, the underground shielding method.