KR102626861B1 - Segmental screw conveyor for tunnel boring machine - Google Patents

Abstract

A segmented screw conveyor for TBM equipment is disclosed. According to one aspect of the present invention, a case; and a screw disposed in the case, wherein the screw is arranged in a row in the longitudinal direction of the screw and includes a plurality of screw segments each having a rotation axis and a blade formed in a spiral shape on an outer peripheral surface of the rotation axis. , a coupling hole is formed in the center on one of the two end surfaces of the rotating shaft that faces the rotating axis of the other screw segment, and the plurality of screw segments are connected to each other through a connecting pin whose both ends are coupled to a pair of connecting holes. A segmented screw conveyor for TBM equipment may be provided.

Description

Segmental screw conveyor for TBM equipment {SEGMENTAL SCREW CONVEYOR FOR TUNNEL BORING MACHINE}

The present invention relates to a segmented screw conveyor for TBM equipment.

In general, tunnel boring methods are largely divided into conventional tunneling methods, represented by NATM (New Austrian Tunneling Method), and mechanized tunneling methods, represented by TBM (Tunnel Boring Machine) methods.

Conventional tunnel construction methods have a risk of safety accidents due to blasting work and concerns about civil complaints due to blasting vibration and noise, so mechanized tunnel construction methods have been mainly used recently.

The mechanized tunnel method has the advantage of being mechanically stable by drilling a tunnel with a circular cross-section, and is particularly suitable for tunnel excavation in urban areas due to lower vibration and noise compared to the conventional tunnel method.

Among them, the excavation principle of TBM equipment, that is, tunnel boring machine, is briefly explained as follows.

As shown in Figures 1 and 2, the TBM equipment can move forward while breaking the rock into small pieces by rotating the cutter head disposed in the front, and the rock fragments crushed by the cutter head are stored in a chamber formed behind the cutter head along with soil. It is filled to maintain the support pressure on the excavation surface, and can be taken out to the outside through a screw conveyor and a belt conveyor in order.

At this time, not only soil but also rock fragments and metal fragments dropped from the TBM equipment can be transported through the screw conveyor, so the screw of the screw conveyor is inevitably vulnerable to wear or damage. If the screw is severely worn or damaged, the TBM excavation efficiency decreases. This may deteriorate, or in some cases, operation of the TBM equipment may become difficult.

Accordingly, it is inevitable to frequently remove damaged screws from the screw conveyor and replace them with new screws. However, due to work space constraints within the TBM equipment, only the screws cannot be removed and replaced from the screw conveyor, so the entire screw conveyor must be separated. Therefore, there is no choice but to replace the screw after taking it outside, and for this, most of the follow-up equipment such as the belt conveyor and bridge placed behind the screw conveyor must be removed, so there was a problem that the screw replacement work took a considerable amount of time.

An embodiment of the present invention provides a segmented screw conveyor for TBM equipment that can shorten the time required for screw replacement as a screw conveyor installed in TBM equipment.

Meanwhile, other unspecified purposes of the present invention will be additionally considered within the scope that can be easily inferred from the following detailed description and its effects.

According to one aspect of the present invention, a case; and a screw disposed in the case, wherein the screw is arranged in a row in the longitudinal direction of the screw and includes a plurality of screw segments each having a rotation axis and a blade formed in a spiral shape on an outer peripheral surface of the rotation axis. , a coupling hole is formed at the center of the surface of both end surfaces of the rotation axis that faces the rotation axis of the other screw segment, and the plurality of screw segments are connected to each other through a connection pin whose both ends are coupled to a pair of coupling holes. A segmented screw conveyor for TBM equipment may be provided.

The depth of the coupling hole may be more than half the length of the connecting pin.

The cross-section of the coupling hole and the connecting pin may have a polygon of the same shape.

The screw includes a fixing bolt coupled to the rotating shaft and the connecting pin in a radial direction. And it may include a nut fastened to the fixing bolt.

A chamfer is formed along the edge of both end surfaces of the rotary shaft and faces the rotary axis of the other screw segment, and the plurality of screw segments are welded to each other through weld beads filled in the grooves formed by the pair of chamfers. You can.

The fixing bolt may cross the center of the cross section of the connection pin and pass through the centers of two opposing sides.

A plurality of fixing bolts are coupled to each of a pair of rotating shafts coupled to the connecting pin, and the plurality of fixing bolts coupled to the same connecting pin and the same rotating shaft are spaced apart from each other in the longitudinal direction of the connecting pin and are in a twisted position. There may be.

According to an embodiment of the present invention, screws can be separated and replaced by screw segment, so screw replacement work can be performed even in TBM equipment with limited work space, and there is no need to separate the entire screw conveyor and take it outside. Screw replacement work can be performed even while some of the follow-up equipment, such as bridges, etc., that had to be removed in advance for conventional screw replacement work, are left in place, and as a result, the time required for screw replacement work is shortened from the existing approximately 90 days. It can be dramatically shortened to about 15 days.

Meanwhile, it is to be added that even if the effects are not explicitly mentioned herein, the effects described in the following specification and their potential effects expected from the technical features of the present invention are treated as if described in the specification of the present invention.

1 and 2 are diagrams showing TBM equipment equipped with a segmented screw conveyor according to an embodiment of the present invention;
Figure 3 is a front view showing the screw of Figure 1;
Figure 4 is a partial cross-sectional view of Figure 3;
Figure 5 is a diagram showing the screw in Figure 4 separated into a plurality of screw segments;
Figure 6 is a cross-sectional view taken along line I-I of Figure 4;
Figure 7 is a cross-sectional view taken along line II-II of Figure 4;
Figure 8 is a cross-sectional view taken along line III-III of Figure 4;
FIG. 9 is a diagram illustrating a plurality of fixing bolts overlapping with each other in order to explain the positional relationship between the fixing bolts of FIGS. 6 to 8 .
The attached drawings are intended as reference for understanding the technical idea of the present invention, and are not intended to limit the scope of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

Terms used in the embodiments of the present invention, unless clearly defined in a different sense, may be interpreted as meanings that can be generally understood by those skilled in the art to which the present invention pertains, and may only be interpreted as specific meanings. It will be viewed as an example to explain the embodiment, but there is no intention to limit the present invention.

In this specification, the singular form will be considered to also include the plural form unless otherwise specified.

Additionally, when a part is described as “including” a certain element, it means that the part may further include other elements.

Additionally, when a component is described as “above” it means above or below the component, and does not necessarily mean that it is located above the direction of gravity.

Additionally, when a component is described as being “connected” or “coupled” to another component, it not only means that the component is directly connected or coupled to the other component, but also indirectly through another component. It may also include cases where it is connected or combined.

In addition, terms such as first and second may be used to describe a certain component, but these terms are only used to distinguish the component from other components, and the essence or order of the component is determined by the term. It is not intended to limit the order or the like.

Figures 1 and 2 are diagrams showing TBM equipment equipped with a segmented screw conveyor according to an embodiment of the present invention.

Referring to Figures 1 and 2, the segmented screw conveyor 1 according to an embodiment of the present invention is installed in TBM equipment and can transport soil flowing into a chamber formed at the rear of the cutter head by a belt conveyor, It may include a case 10 and a screw 20 disposed within the case 10. Here, soil may be used to include rock fragments, soil, etc. that are crushed by the cutter head and introduced into the chamber.

Meanwhile, the case 10 of the screw conveyor 1 may be disposed inclinedly within the TBM equipment.

FIG. 3 is a front view showing the screw of FIG. 1, FIG. 4 is a partial cross-sectional view of FIG. 3, and FIG. 5 is a view showing the screw in FIG. 4 separated into a plurality of screw segments.

Referring to FIGS. 3 to 5 , the screw 20 may include a plurality of screw segments 100, a connecting pin 200, a fixing bolt 300, and a nut 400. Meanwhile, FIGS. 4 and 5 show the blade 120 constituting the screw segment 100 not being visible for convenience of illustration.

A plurality of screw segments 100 may be arranged in a row in the longitudinal direction of the screw 20.

The screw segment 100 may include a rotation axis 110 extending in the longitudinal direction (X-axis direction) of the screw 20, and a blade 120 formed in a spiral shape on the outer peripheral surface of the rotation axis 110.

Therefore, when the plurality of screw segments 100 are connected to each other by the connecting pin 200, the screw 20 in which the plurality of blades 120 are continuously connected can be formed.

Meanwhile, the rotation shaft 110 and the blade 120 are formed as one piece and can be manufactured to withstand a significant amount of torque typically required for a screw conveyor in TBM equipment.

The connection pin 200 may connect a pair of adjacent screw segments 100 among the plurality of screw segments 100 .

Specifically, in each of the plurality of screw segments 100, a coupling hole 110a may be formed in the center of the surface of both end surfaces of the rotation axis 110 that faces the rotation axis 110 of the other screw segment 100, Both ends of the connection pin 200 are inserted into and coupled to a pair of coupling holes 110a formed in a pair of adjacent screw segments 100, thereby connecting a pair of adjacent screw segments 100 to each other.

That is, a pair of screw segments 100 adjacent to each other may be manufactured separately from the pair of screw segments 100 and then connected to each other through a connecting pin 200 that is joined.

Therefore, despite the tolerances that occur during the processing or manufacturing process of the pair of coupling holes 110a and the connection pin 200, the possibility of the pair of rotation shafts 110 being closely coupled to each other increases the possibility of separation due to tolerances. can be reduced, and as long as the connecting pin 200 is separated from at least one of the pair of rotation shafts 110, a pair of adjacent screw segments 100 can be separated from each other, so that the screw segment 100 Separation work can also be made easier.

To this end, the depth D of the coupling hole 110a may be more than half the length L of the connection pin 200.

More preferably, the depth of the coupling hole 110a may be greater than half the length L of the connecting pin 200.

The fixing bolt 300 may be coupled to the rotating shaft 110 and the connecting pin 200 by penetrating in the radial direction of the screw 20, and the nut 400 may be coupled to the rotating shaft 110 and the connecting pin 200. It can be fastened to the fixing bolt 300.

Therefore, it is possible to prevent the connection pin 200 from being separated during operation of the screw conveyor 1.

In addition, in each of the plurality of screw segments 100, a chamfer 110b is formed along the edge of the surface on the surface facing the rotation axis 110 of the other screw segment 100 among both end surfaces of the rotation axis 110. The weld bead 500 is filled in a ring-shaped groove with a V-shaped cross-section formed by a pair of chamfers 110b formed on a pair of screw segments 100 adjacent to each other, thereby forming a pair of adjacent screw segments 100. The screw segments 100 may be welded to each other.

FIG. 6 is a cross-sectional view taken along line II-I of FIG. 4, FIG. 7 is a cross-sectional view taken along line II-II of FIG. 4, FIG. 8 is a cross-sectional view taken along line III-III of FIG. 4, and FIG. 9 is a cross-sectional view taken along line III-III of FIG. 4, and FIG. This is a drawing showing a plurality of fixing bolts overlapping with each other to explain the positional relationship between the fixing bolts.

Referring to FIGS. 6 to 9 , the cross section of the coupling hole 110a and the cross section of the connection pin 200 may be formed of a polygon of the same shape, for example, a hexagon. For example, the connection pin 200 may have a hexagonal pillar shape. Accordingly, when connecting the plurality of screw segments 100 to each other, alignment between adjacent blades 120 can be more easily achieved.

Additionally, the fixing bolt 300 may be arranged to cross the center of the cross section of the connection pin 200 and penetrate through the centers of two opposite sides of the cross section.

Accordingly, machining of the through hole where the fixing bolt 300 is coupled to the connecting pin 200 can be easily processed, and the stability of the coupling structure between the connecting pin 200 and the fixing bolt 300 can be improved.

In addition, a plurality of fixing bolts 300 may be coupled to each of a pair of rotation shafts 110 coupled to the connection pin 200, and a plurality of fixing bolts 300 may be coupled to the same connection pin 200 and the same rotation shaft 110. The fixing bolts 300 may be spaced apart from each other in the longitudinal direction of the connection pin 200 and may be arranged to pass through the centers of different sides in the cross section of the connection pin 200. That is, the plurality of fixing bolts 300 may be in a skew position with the center line of the connection pin 200 as a common vertical line.

For example, when the cross-sectional shape of the connection pin 200 is hexagonal, the connection pin 200 may be fixed to each rotation axis 110 through three fixing bolts 300, and three fixing bolts ( 300) They can be placed at 120 degree intervals.

Accordingly, the processing of the through hole where the fixing bolt 300 is coupled to the connecting pin 200 can be more easily processed, the stability of the coupling structure between the connecting pin 200 and the fixing bolt 300 can be further improved, and the fixing bolt 300 can be more easily processed. Stress acting on the bolt 300 may be evenly distributed.

Additionally, the bolt heads or nuts 400 of the plurality of fixing bolts 300 coupled to one connection pin 200 may be arranged in a spiral shape on the outer peripheral surface of the rotation shaft 110. As a result, the possibility of interference with the blade 120 formed in a spiral shape on the outer peripheral surface of the rotation shaft 110 can be eliminated.

Although the above description focuses on preferred embodiments of the present invention, this is only an example and does not limit the present invention. Those of ordinary skill in the technical field to which the present invention pertains can modify and change the embodiments in various ways by adding, changing, deleting or adding components, etc., without departing from the technical idea of the present invention as set forth in the claims. It will be possible, and this will also be said to be included within the scope of the rights of the present invention.

1: screw conveyor 10: case
20: screw 100: screw segment
110: rotation axis 110a: coupling hole
110b: Chamfer 120: Blade
200: connection pin 300: fixing bolt
400: nut 500: weld bead

Claims (7)

case; and
Including a screw disposed within the case,
The screw is,
A plurality of screw segments arranged in a row in the longitudinal direction of the screw, each having a rotation axis and a blade formed in a spiral shape on an outer peripheral surface of the rotation axis,
In a pair of screw segments adjacent to each other, a pair of chamfers are formed along the edges on each of the opposing surfaces of the pair of rotation axes, and the pair of screw segments are formed by the pair of chamfers. are mutually welded through weld beads filled in the grooves,
A coupling hole is formed at the center of each of the opposing surfaces of the pair of rotation shafts, and the pair of screw segments are connected to each other through a connecting pin whose both ends are coupled to the pair of coupling holes,
The screw is,
a plurality of fixing bolts coupled to the rotation shaft and the connecting pin in a radial direction; and
Further comprising a nut fastened to each of the plurality of fixing bolts,
The plurality of fixing bolts are arranged to be spaced apart in the longitudinal direction of the connection pin and are twisted so as not to interfere with the blade,
A segmental screw conveyor for TBM equipment, wherein the plurality of fixing bolts are formed on both sides of the weld bead. According to paragraph 1,
Segmental screw conveyor for TBM equipment, characterized in that the depth of the coupling hole is more than half the length of the connecting pin. According to paragraph 1,
A segmental screw conveyor for TBM equipment, characterized in that the cross sections of the coupling hole and the connecting pin are made of polygons of the same shape. delete delete According to paragraph 1,
The fixing bolt is a segmented screw conveyor for TBM equipment, characterized in that it crosses the center of the cross section in the cross section of the connecting pin and passes through the centers of two sides facing each other. delete

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