JP5294111B2 - Open tunnel excavator door structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To disperse pressure exerted on a door of a tunnel boring machine from an inflatable bag when the door is closed. <P>SOLUTION: The door 4 constituted of: a door plate 21 an upper-side wheel 22a and a lower-side wheel 22b provided on both side surfaces of the door plate 21, an upper-side stopper 23 provided at the upper side of the rear surface 21b of the door plate 21, and a lower-side stopper 24 provided at the lower side of the rear surface 21b of the door plate 21 is arranged in an opening on the face side of each of small cross-section excavation partitions 2A-2D. A first rail and a second rail 32b for the opening and closing of the door 4 and for the upper-side wheel 22a and the lower-side wheel 22b to slide over and a groove 32 for housing the upper-side stopper 23 are arranged in a wall 17 in each of the small-section excavation partitions 2A-2D. A lower-side stopper receiver 33 for supporting the lower-side stopper 24 when closed is arranged in a floor part 18 in each of the small cross-section excavation partitions 2A-2D. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a door provided on the face side of an open tunnel excavator for excavating a tunnel having a mainly rectangular cross section such as a road tunnel, an underpass, and a common groove.

Conventionally, tunnels such as roads and common grooves provided in urban areas generally have a rectangular cross section. However, when excavating using a shield excavator with a circular cross section, it will excavate more than necessary, especially at shallow depths in urban areas where there are many buried objects in the surrounding area. In some cases, it could not be used.
Therefore, a shield excavator capable of excavating a tunnel having a rectangular cross section is used. However, a shield excavator having a rectangular cross section is expensive. In particular, a sealed shield excavator having a rectangular cross section has a complicated cutter mechanism and is more expensive. In addition, the cost of the open shield excavator with the rectangular cross section can be reduced compared to the sealed shield excavator with the rectangular cross section, but the settlement of the ground surface is 2 to 3 compared with the sealed shield excavator with the rectangular cross section. There was a problem that it became twice as large.

Thus, an open shield excavator having a rectangular cross section divided into a plurality of small cross section excavating sections has been proposed. In this excavator, for example, it is divided into small section excavation sections of two stages in the vertical direction and two rows in the horizontal direction, and each small section excavation section is provided with a door and an excavator that can be opened and closed. The face of the door is provided with an inflatable bag body that can be inflated at a predetermined pressure. Except for the small section excavation section where excavation is performed, the door is closed and the face is pressed by the inflatable bag body. Suppresses collapse and land subsidence.
Patent Document 1 proposes an excavating element that includes a pressing member that can be opened and closed with respect to the face by pressing an airbag that contacts the face in an inflated state from the back. According to this excavation element, the collapse of the face is prevented by the airbag restraining the face when excavation is stopped.
JP 2008-163602 A

However, the conventional excavator has the following problems.
A door provided in an open shield excavator having a rectangular section divided into a plurality of small section excavation sections receives pressure from the expansion bag body in a state where the door is closed and the expansion bag body expands and presses the face. And with a door that has a hinge at the upper end of the door and opens the lower end of the door to the excavator side, when opening the opening of the small-section excavation section, it is fixed by the bolts provided at the lower end on both sides of the door However, there is a problem in that the pressure applied from the inflatable bag body to the door is transmitted to the metal fittings, and the metal fittings are deformed so that they cannot be removed, and the door can be opened and closed.
Further, the pressing member provided in the excavating element according to Patent Document 1 also has a problem that the pressing member cannot be fixed in the case of failure because the fixing member that fixes the pressing member is a swing type.

  The present invention has been made in view of the above-described problems, and in a state where the door is closed and the face is pressed, the pressure applied to the door from the face side can be dispersed, and even when a large pressure is applied to the door It is an object of the present invention to provide a door structure for an open tunnel excavator that can be fixed to the door and can be easily opened and closed.

Further, in the structure of the door of the open tunnel excavator according to the present invention, the guide is provided on the face side opening of the open tunnel excavator, holding the face, and provided on the wall of the open tunnel excavator. A structure of a door that moves and opens and closes along with a first stopper supported by a first support portion provided on a wall of an open tunnel excavator when the door is closed, and an open type when the door is closed A second stopper supported by a second support portion provided on a floor portion of the tunnel excavator , wherein the first stopper is in a groove-shaped moving portion connected to the first support portion. The first stopper is supported by the first support part at the same time as the door is closed. And the second stopper is Serial is supported on the second supporting portion, and at the same time the door in an open state, the first stopper is characterized that you have been configured to be fitted into the stopper accommodating portion.
In the present invention, the first stopper supported by the first support provided on the wall of the open tunnel excavator and the second support provided on the floor of the open tunnel excavator are supported. When the door closes the face side opening and presses the face, the pressure applied to the door from the face side is applied to the first and second stoppers and the first and second stoppers. It can be transmitted to the wall portion and the floor portion through the support portion, and pressure can be prevented from concentrating on the door.

Further, in the door structure of the open type tunnel excavator according to the present invention, the first stopper and the second stopper are provided with a tapered portion whose lower side is smaller in diameter than the upper side, and the first support portion is the first stopper of the first stopper. It is preferable that a tapered part type concave part is provided, and the second support part is provided with a tapered part type concave part of the second stopper.
In the present invention, the first and second stoppers are formed with a taper whose lower side is smaller in diameter than the upper side, the first support part is provided with a tapered recess of the first stopper, and the second support part is the second support part. By providing the tapered recess of the stopper of the door, the first and second stoppers are supported in combination with the first and second support portions in the door with the face side opening closed, and the door When opening, the first and second stoppers can be easily moved away from the first and second support portions by moving upward.

  According to the present invention, the door provided at the face side opening includes a first stopper supported by a first support provided on a wall of the open tunnel excavator when the door is closed, and the door And a second stopper supported by a second support provided on the floor of the open tunnel excavator when the door is closed, so that the pressure applied to the door from the face side when the door is closed is dispersed Can do.

Hereinafter, the structure of a door of an open tunnel excavator according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a diagram showing an overview of an open tunnel excavator according to an embodiment of the present invention, FIG. 2 is a front view of the open tunnel excavator shown in FIG. 1, and FIG. 3 is an open mold according to an embodiment of the present invention. The figure which shows the state which the door of a tunnel excavator has closed the opening part, FIG. 4 is the figure which shows the state which the door of the open type tunnel excavator by embodiment of this invention has opened the opening part, FIG. FIG. 2 is a perspective view of a door of an open tunnel excavator according to an embodiment of the present invention.

As shown in FIG. 1, an open type tunnel excavator 1 according to the present embodiment is an open type tunnel excavator for excavating a tunnel having a rectangular cross section constructed for applications such as road tunnels, underpasses, and joint grooves. It is used for tunnels with relatively little water in the ground and shallow depth.
Basically, in the same manner as the well-known shield excavator, excavated earth and sand are unloaded by an appropriate conveying means while excavating ground for one cycle, and, for example, concrete is provided behind the open tunnel excavator 1. A segment S (lining body) such as steel is assembled, and a reaction force is taken from the segment S for propulsion. The one-cycle excavation distance is a distance at which one ring segment S can be installed.
In the present embodiment, the tunnel excavation direction is “front” and “front end”, and the opposite directions are “rear” and “rear end”.

  As shown in FIGS. 1 and 2, the open-type tunnel excavator 1 includes a rectangular cross-sectional shape of a tunnel cross section having two stages in the vertical direction and two rows in the horizontal direction in four rows of the small cross section excavation sections 2A, 2B, 2C, and 2D. The outer shell 3 divided into two, the door 4 that opens and closes the opening on the face side of each small section excavation section 2A-2D, the airbag 5 (pressing mechanism) provided on the face side of the door 4, and each small It is roughly comprised from the small cross-section excavator 6 installed in cross-section excavation section 2A-2D, and the transfer conveyor 7 which carries the earth and sand excavated by the small cross-section excavator 6 back.

The outer shell 3 is arranged in the vertical direction and the horizontal direction in order to partition the small-section excavation sections 2A to 2D at the front position in the skin plate 11 and the skin plate 11 which is located on the outer periphery and has a rectangular shape. It consists of a partition plate 12 and a support frame portion 13 that is framed in a rectangular shape along the circumferential direction of the rear side inner surface in the skin plate 11.
The front end portion of the outer shell 3 is inclined at a predetermined inclination angle so that the upper portion protrudes from the lower portion toward the face, and the position of the excavation surface (face) in the upper-section small section excavation sections 2A and 2C is lower. Are located on the front side in the forward direction of the open tunnel excavator 1 from the small section excavation sections 2B and 2D.

  A plurality of propulsion jacks 14 are provided on the outer periphery of the rear end portion of the support frame portion 13, and these propulsion jacks 14 advance the open-type tunnel excavator 1 by pressing the tip portions thereof to the segment S. It is the composition which makes it. Inside the skin plate 11 and above the upper small section excavation sections 2A and 2C, a slide hood 15 that can project toward the face is provided. The slide hood 15 projects into the ground of the face in order to prevent the collapse of the upper ground during excavation.

As shown in FIG. 3, when the door 4 closes the openings of the small-section excavation sections 2 </ b> A to 2 </ b> D (hereinafter simply referred to as “closed”), the door plate 21 of the face plate of the door 4 It arrange | positions in the state orthogonal to an axial direction (excavation direction of the open type tunnel excavator 1). As shown in FIG. 4, when the door 4 opens the openings of the small section excavation sections 2 </ b> A to 2 </ b> D (hereinafter simply referred to as “opened”), the door 4 has the door plate 21. It arrange | positions so that the surface provided with the airbag 5 may be on the lower side of the ceiling part 16 formed of the skin plate 11 or the partition plate 12 above the excavation sections 2A to 2D in parallel with the ceiling part 16.
In the present embodiment, in the door plate 21 of the door 4 when closed, the surface facing the face is defined as the front surface 21a, and the opposite side is defined as the rear surface 21b.

As shown in FIG. 5, the door 4 includes a door plate 21, an upper wheel 22 a provided on the upper side of both side surfaces 21 c of the door plate 21, and a lower side provided on the lower side of both side surfaces 21 c of the door plate 21. It is comprised from the side wheel 22b, the upper side stopper 23 provided in the upper side of the rear surface 21b of the door board 21, and the lower side stopper 24 provided in the lower part side of the rear surface 21b of the door board 21. FIG.
As shown in FIGS. 3 and 4, the wall 17 formed by the side skin plate 11 or the partition plate 12 in each of the small section excavation sections 2A to 2D has an upper wheel 22a as well as the door 4 opened and closed. A rail 31 (guide) on which the lower wheel 22b slides and a groove 32 in which the upper stopper 23 is accommodated are provided. In addition, a lower stopper receiver 33 that supports the lower stopper 24 when closed is provided on the floor 18 formed by the lower skin plate 11 or the partition plate 12 in each of the small section excavation sections 2A to 2D.

The door plate 21 is formed in a flat plate shape having a size capable of closing the openings of the small-section excavation sections 2A to 2D surrounded by the skin plate 11 and the partition plate 12, and an airbag 5 described later is formed on the front surface 21a. Arranged.
The upper wheel 22a and the lower wheel 22b are provided so as to protrude from the side surface 21c of the door plate 21 so as to be able to slide on the rail 31 when the door 4 is opened and closed. A predetermined interval is provided between the upper wheel 22a and the lower wheel 22b.

The upper stopper 23 is disposed on the upper side of the rear surface 21b of the door plate 21 and below the height of the upper wheel 22a, and protrudes from the rear surface 21b and the side surface 21c of the door plate 21 and is provided in the wall portion 17. It is accommodated in the groove 32. On the side surface of the upper stopper 23 on the wall 17 side, a tapered portion 23a having a smaller diameter toward the lower side is formed.
The lower stopper 24 is disposed on the lower side of the rear surface 21 b of the door plate 21. On the side surface of the lower stopper 24, a tapered portion 24a having a smaller diameter toward the lower side is formed.

The rail 31 is provided on the wall portion 17 along the side surface 21c of the door plate 21 of the door 4 when closed and extends in the vertical direction, and on the side surface 21c of the door plate 21 of the door 4 when opened. A second rail 31b provided in the wall portion 17 along the horizontal direction and connected in a substantially L shape at a connection point 31c. The upper wheel 22a and the lower wheel 22b are connected to the first rail 31a and the second rail 31b. The second rail 31b can be continuously slid.
The length of the first and second rails 31 is longer than the distance between the upper wheel 22a and the lower wheel 22b provided on the side surface 21c of the door plate 21.

The groove portion 32 is a groove-like recess formed in the wall portion 17. The upper stopper support portion 32 a that supports the upper stopper 23 when closed, the upper stopper housing portion 32 b that accommodates the upper stopper 23 when opened, and the opening and closing of the door 4. Accordingly, the upper stopper 23 is formed from the movable upper stopper moving portion 32c.
The upper stopper support portion 32a is formed in a tapered portion 23a-type concave portion of the upper stopper 23 at the front end portion of the groove portion 32 on the side of the upper stopper 23 when closed. The upper stopper accommodating portion 32b is formed at the rear end portion of the groove portion 32 on the side of the upper stopper 23 when closed. The upper stopper moving part 32c is formed in a wider range than the locus of the upper stopper 23 that moves when the door 4 is opened and closed.

  The lower stopper receiver 33 is a member having a tapered portion 24a type concave portion of the lower stopper 24, and is formed on the floor portion 18 on the rear side of the lower stopper 24 at the time of closing, with the tapered portion 24a of the lower stopper 24 and the lower side. The stopper receiver 33 is disposed so as to engage with the concave portion of the tapered portion 24a type.

As shown in FIG. 2, the airbag 5 is an inflatable inflatable bag body, which has three levels in the vertical direction on the face side of the door plate 21 of each door 4 in the small section excavation sections 2 </ b> A to 2 </ b> D and 3 in the horizontal direction. Nine columns are provided. The airbag 5 has a structure in which air (fluid) flows into the interior of the airbag 5 through a pipe disposed in the door plate 21 and expands at a predetermined pressure.
Such an airbag 5 is inflated when air is introduced with the door 4 closed after the face is excavated in each of the small-section excavation sections 2A to 2D, and the face 5 is expanded at a pressure corresponding to the soil water pressure of the excavated portion. Press and hold. At this time, the door 4 receives the pressure of the airbag 5, but the door plate 21, the upper and lower stoppers 23 and 24, and the upper stopper support 32 a and the lower stopper receiver 33 of the groove 32 can withstand this pressure. It shall have strength.
The airbag 5 is in a contracted state when the door 4 is opened and closed and when the door 4 is opened.

Next, a method for opening and closing the door of the above-described open tunnel excavator will be described with reference to the drawings.
In order to make the door 4 in the closed state shown in FIG. 3 into an open state as shown in FIG. 4, first, the door 4 is set so that the upper wheel 22a reaches the connection point 31c of the first and second rails 31a and 31b. Is moved upward. At this time, the upper stopper 23 is separated from the upper stopper support portion 32 a and the lower stopper 24 is also separated from the lower stopper receiver 33.
Then, the upper wheel 22a that has reached the connecting point 31c is moved rearward on the second rail 31b, and the lower wheel 22b is moved upward on the first rail 31a to rotate the door 4. When the lower wheel 22b reaches the connecting point 31c and the door 4 rotates so that the door plate 21 is horizontal, the upper 22a and the lower wheel 22b are moved further rearward to move the upper stopper 23 to the upper stopper accommodating portion 32b. Accommodate.
Moreover, what is necessary is just to perform reversely the operation | work which makes the door 4 of a closed state open in order to make the door 4 of the open state shown in FIG. 4 into a closed state.

Next, the function and effect of the door structure of the open type tunnel excavator according to this embodiment will be described with reference to the drawings.
In the door structure of the open type tunnel excavator according to the present embodiment, the door 4 in the closed state has a pressure applied to the door plate 21 from the inflated airbag 5 through the upper stopper 23 and the upper stopper support portion 32a. Since it is transmitted to the part 17 and transmitted to the floor 18 via the lower stopper 24 and the lower stopper receiver, the pressure applied to the door plate 21 from the airbag 5 can be dispersed, and this pressure can be dispersed. The effect which the excavator 1 main body can bear is produced.

Further, the upper stopper 23 is formed with a tapered portion 23a, and the upper stopper support portion 32a is formed with a concave portion having the same shape as the tapered portion 23a. Therefore, when the upper stopper 23 is closed, the upper stopper 23 and the upper stopper support portion 32a are in close contact. The pressure applied to the door plate 21 from the inflated airbag 5 can be efficiently transmitted to the wall portion 17. Further, when the door 4 is opened, the upper stopper 23 and the upper stopper support portion 32a can be easily separated by moving the door 4 upward, and when the door 4 is closed, the upper stopper support portion. Since it is only necessary to insert the upper stopper 23 into 32a, the upper stopper 23 can be easily attached and detached.
Further, since the tapered portion 24a is formed also in the lower stopper 24 and the concave portion of the tapered portion 24a type is also formed in the lower stopper receiver 33, similarly to the upper stopper 23 and the upper stopper supporting portion 32a described above, It is in close contact when closed, and the lower stopper 24 can be easily detached.
Moreover, the upper stopper 23 can keep the door 4 open by being accommodated in the upper stopper accommodating portion 32b when opened.

  In addition, the door 4 is opened and closed by the upper wheel 22a and the lower wheel 22b moving on the first and second rails 31a and 31b, so that the door 4 rotates in the vertical direction. Like the hinged door, the contracted airbag 5 is not dragged to the floor 18 and friction between the airbag 5 and the floor 18 does not occur, and the door 4 can be opened and closed smoothly. In addition, the airbag 5 can be prevented from being damaged.

As mentioned above, although embodiment of the structure of the door of the tunnel excavator by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the above-described embodiment, the open-type tunnel excavator 1 includes the outer shell 3 divided into four small-section excavation sections 2A to 2D, and the opening on the face side of the small-section excavation sections 2A to 2D. However, the door 4 may be installed in two or more sections on the top and bottom or on the left and right with respect to the size of the tunnel cross section. Or you may provide the door 4 in the opening by the side of the face of the outer shell which is not divided | segmented into a small-section excavation section.
In the above embodiment, the door 4 is provided with the airbag 5 on the face side. However, the door 4 that holds the face without the airbag 5 is used as the door of the tunnel excavator according to this embodiment. It is good also as a structure.
Further, in the above embodiment, when the door 4 is opened, the upper stopper 23 is accommodated in the upper stopper accommodating portion 32b and the door plate 21 is kept open, but without providing the upper stopper accommodating portion 32b, The door plate 21 may be kept open with a hook or other metal fittings.
In short, it is only necessary to obtain the desired function in the present invention.

It is a figure showing the whole tunnel excavator outline by an embodiment of the invention. It is a front view of the tunnel excavator shown in FIG. It is a figure which shows the closed state of the door of the tunnel excavator by embodiment of this invention. It is a figure which shows the state with the open door of the tunnel excavator by embodiment of this invention. It is a perspective view of the door of the tunnel excavator by embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tunnel excavator 4 Door 17 Wall part 18 Floor part 21 Door board 22a Upper wheel 22b Lower wheel 23 Upper stopper (1st stopper)
24 Lower stopper (second stopper)
31 rail (guide)
32a Upper stopper support (first support)
33 Lower stopper holder (second support part)

Claims (2)

A structure of a door that is provided at a face side opening of an open type tunnel excavator, presses the face, moves along a guide provided on a wall part of the open type tunnel excavator, and opens and closes,
A first stopper supported by a first support provided on a wall of the open tunnel excavator when the door is closed;
A second stopper supported by a second support provided on the floor of the open tunnel excavator when the door is closed ,
The first stopper is configured to be movable in a groove-shaped moving part connected to the first support part, and is configured to be fitted to a stopper accommodating part connected to the moving part,
At the same time that the door is closed, the first stopper is supported by the first support part, and the second stopper is supported by the second support part,
And at the same time the door in an open state, the first stopper of the door of an open tunneling machine characterized that you have been configured to be fitted into the stopper accommodating portion structure.   The first stopper and the second stopper have a tapered portion whose lower side has a smaller diameter than the upper side, the first support portion has a concave portion of the tapered portion type of the first stopper, and the second support The structure of the door of the open type tunnel excavator according to claim 1, wherein the portion includes a concave portion of a tapered portion type of the second stopper.

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