JP2009114669A - Propulsive box body structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve efficiency of propulsion transmission by increasing area of contact part of joint end faces of adjacent propulsive box bodies in a tunnel curved section. <P>SOLUTION: The propulsive box body 1 is composed of horizontal wall parts 11, 12 and vertical wall parts 13, 14 and is formed like a rectangular frame. This propulsive box body structure is constituted by arranging a plurality of propulsive box bodies 1, 1 in series and abutting joint end faces 1a, 1b of the propulsive box bodies 1 mutually for propulsion. The propulsive box body 1 is provided with a thrust transmission member 10 having elasticity in a scope of the whole front joint end face 1a. The thrust transmission member 10 is constituted by forming a horizontal wall projecting part 10A protruding a central part in the transverse direction in the horizontal wall parts 11, 12. The thrust transmission member 10 can contract and restore while the horizontal wall projecting part 10A is abutted on the rear joint end face 1b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a propelling box structure propelled by a propulsion method.

  Conventionally, when constructing underground underground crossings of railways and roads by the non-open cutting method, the large section tunnel is divided into small section tunnels by the shield method, and these small section tunnels are constructed by a small section shield excavator. There is a method of constructing a large-section tunnel by integrating the walls forming the outer shell of the large-section tunnel and removing the inside of the wall. As a method of constructing such a small cross section, there is a method of propelling the propelling box by the propulsion method, which includes a shield excavator equipped with a cutter at the top of the propelling box that forms a rectangular frame in front view, and shield excavation This is a propulsion work in which a propulsion box is propelled in sequence between a shield excavator and a propulsion jack for propelling the shield excavator as the machine advances.

  In such a propulsion box, the joint end surfaces of the front and rear propulsion boxes abut against each other evenly at the tunnel straight line portion, so that the propulsive force is evenly transmitted on the joint end surface. However, in the tunnel curve portion, the inner joint end faces are reduced in the radius direction of the curvature and contacted with each other, and a gap is formed between the outer joint end faces, and a propulsive force is generated on the inner joint end face. As a result, the joint end face inside the propelling box may be damaged. Therefore, for example, Patent Document 1 discloses a propulsion box having a structure in which the joining end surfaces inside the tunnel curved portion are in contact with each other and are not damaged.

In Patent Document 1, a concave portion having an arc surface is formed on the joint end surface on one end side of the propulsion box, and a convex portion that engages the concave portion is formed on the joint end surface on the other end side. Are engaged with each other, a thrust transmission member projecting from the end face of one of the propelling boxes is disposed on both sides of the concavo-convex portion. In other words, since the engagement surface of the concavo-convex portion has an arc shape, the engagement surface is always in contact and engaged even when the front and rear propelling boxes face different directions in the tunnel curve portion. A configuration for transmitting a propulsive force through an uneven portion and a thrust transmission member is disclosed.
JP 2007-70938 A

However, the conventional propelling box structure has the following problems.
That is, in Patent Document 1, the thrust transmission member provided on a part of the joint end face and the uneven portion particularly in the tunnel curve portion generates a propulsive force between the propulsion boxes disposed adjacent to each other in the tunnel axial direction (propulsion direction). Since it becomes a location to transmit and the contact area of both joint end surfaces is in a partial range, there is a drawback that the propulsive force cannot be reliably transmitted between the propulsion boxes. Therefore, a structure of a propelling box that can reliably transmit propulsive force has been demanded, and there remains room for improvement in that respect.

  The present invention has been made in view of the above-described problems, and the propulsion box is designed to improve the propulsion transmission efficiency by increasing the contact area between the joint end faces of the adjacent propulsion boxes in the tunnel curve portion. The object is to provide a body structure.

In order to achieve the above object, in the propulsion box structure according to the present invention, a plurality of propulsion boxes formed in a rectangular frame shape by arranging a pair of upper and lower horizontal wall portions and a pair of left and right vertical wall portions on four sides of a rectangle. Are arranged in series and propelled by pushing the joint end faces of the propelling box in contact with each other, and the propulsion box is provided with a thrust transmission member having elasticity throughout the joint end face on one end side. In the thrust transmission member, a lateral wall convex portion is formed by projecting the lateral central portion in the lateral wall portion, and the lateral wall convex portion is in contact with the joining end surface on the other end side of the propulsion box, The thrust transmission member can be compressed and restored.
In the present invention, when the propulsion box propels the straight tunnel portion, the thrust transmission member provided on the joint end face on one end side of the propulsion box abuts in a state of being uniformly compressed over the entire joint end face on the other end side. Therefore, the propulsive force can be transmitted through the thrust transmission member in the entire range of the joining end surface. In the tunnel curve portion, since the separation between the joint end surfaces becomes small at the inside in the curvature radius direction (center side of the curvature radius) of the joint end surface, the lateral wall convex portion of the thrust transmission member is compressed by elastic deformation. And in the horizontal direction center part of a horizontal wall convex-shaped part, although separation of a joint end surface becomes large, since the center part is the shape which protrudes the most front side, it will restore | restore corresponding to the said separation. That is, in the range from the inside in the radius direction of curvature of the joint end surface to the central portion in the lateral direction, the lateral wall convex portion is in contact with the rear joint end surface. Therefore, the propulsive force can be transmitted through the thrust transmission member in the radius direction inner side range of the joint end face where the propulsive force is concentrated in the curved curve portion. In addition, since the thrust transmission member plays a role of a cushioning material between adjacent propulsion boxes, the propulsive force is concentrated on the joint end face located on the inner side in the radius of curvature at the tunnel curved portion as in the prior art. This can prevent the propulsion box from being damaged.

Moreover, in the propulsion box structure according to the present invention, it is preferable that the lateral wall convex portion is formed in a stepped shape from both lateral end portions toward the central portion.
In the present invention, each step portion in the convex portion on the lateral wall is elastically deformed corresponding to the joint end surface on the other end side, so that the contact area between the two can be increased, and the transmission efficiency of the propulsive force is further improved. Can be made.

Moreover, in the propulsion box structure according to the present invention, it is preferable that the vertical wall portion is formed with a vertical wall convex portion having a thrust transmission member protruding from the vertical center portion.
In the present invention, even when the preceding propelling box is propelled upward or downward with respect to the succeeding propelling box, the vertical wall convex portion is elastic according to the position of the propelling box. Since it can be compressed and restored as needed by deformation and kept in contact with the joint end surface on the other end side without any gap, it is transmitted evenly over the entire joint end surface and reliably transmitted to the excavator at the tip. can do.

  According to the propulsion box structure of the present invention, in the tunnel curve portion, the range in which the propulsive force is concentrated on the inner side in the curvature radius at the joint end surface, that is, the lateral wall convex portion is compressed and restored by elastic deformation from the lateral central portion. It is possible to maintain a state of being in contact with the joint end surface on the other end side without a gap in the inner range, and without reducing the contact area between the joint end surfaces in the range, evenly in the range of the entire joint end surface Since it can transmit and transmit reliably to the excavator of a front-end | tip part, propulsion transmission efficiency can be improved.

Hereinafter, a propelling box structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.
FIG. 1 is a perspective view showing an outline of constructing a large-section tunnel while installing a propulsion box according to an embodiment of the present invention, FIG. 2 is a perspective view showing a joint structure between the propulsion boxes shown in FIG. Is a plan view of the joint structure of the propulsion box shown in FIG. 2, FIG. 4 is a side view of the joint structure of the propulsion box, FIG. 5 is a plan view showing the state of the propulsion box when propelling the tunnel straight section, and FIG. It is a top view which shows the state of the propulsion box at the time of tunnel curve part propulsion.

  As shown in FIG. 1, the propulsion box structure according to the present embodiment divides a large-section tunnel into small-section tunnels by a shield method, and excavates these small-section tunnels with a small-section shield excavator 2 for propulsion. Adopted in the propulsion method in which the box 1 is sequentially added along the axial direction of the tunnel excavated by the shield excavator 2 and arranged in series, and applied to the structure of the joint end face between the propulsion boxes 1 and 1 It is. The large cross-section tunnel is arranged with the propelling box 1 forming the small cross-section tunnel adjacent to the top, bottom, left and right as appropriate when viewed from the front, and the inside of the large cross-section tunnel is removed while leaving the outer shell portion. Although it is constructed, detailed description is omitted.

This propulsion box 1 is constructed by a construction procedure similar to a well-known propulsion method. That is, the propulsion box 1 located at the tip of the propulsion is provided with the shield excavator 2 having an outer shape slightly larger than the outer shape of the propulsion box 1 and is located at the rear of the propulsion box 1 connected in the propulsion direction. The body 1 is propelled by a propulsion jack (not shown) provided at the tunnel base end (starting portion). That is, by propelling the propulsion force of the propulsion jack from behind to the shield excavator 2 at the tip, all the propulsion boxes 1 are pushed forward efficiently for propulsion.
In the following description, the forward side in the propulsion direction is referred to as “front”, and the opposite side is referred to as “rear”.

  As shown in FIG. 2, the propelling box 1 is made of RC concrete, and a pair of upper and lower horizontal wall portions 11 and 12 and a pair of left and right vertical wall portions 13 and 14 are arranged on four sides of a rectangle and are rectangular in a front view. It is formed in a frame shape. And between the propulsion boxes 1 and 1 arranged in the tunnel axial direction (propulsion direction), a thrust transmission member 10 is provided over the entire circumference. That is, the thrust transmission member 10 is provided on the front joint end surface 1 a of the propulsion box 1 so that the thrust transmission member 10 is in contact with the rear joint end surface 1 b of the propulsion box 1.

  As shown in FIGS. 2 and 3, the thrust transmission member 10 is formed with a lateral wall convex portion 10 </ b> A in which the lateral center portions of the lateral wall portions 11 and 12 protrude. More specifically, the thrust transmission member 10 is made of a material having elasticity (elastic member) such as polystyrene foam or rubber, and is formed in a step shape from both lateral ends to the central portion. The three elastic members having different lengths are overlapped so that a member having a short length is disposed on the front side, and they are fixed to each other. And the level | step difference shape of the thrust transmission member 10 is left-right symmetric in the width direction (lateral direction).

  As shown in FIGS. 2 and 4, the thrust transmission member 10 is formed with a vertical wall flat plate portion 10 </ b> B having a uniform thickness dimension in the vertical direction in the vertical wall portions 13 and 14. The vertical wall flat plate portion 10 </ b> B has substantially the same thickness dimension so as to be flush with the thrust transmission member 10 located at both lateral ends of the horizontal wall portions 11 and 12.

As shown in FIG. 5, in the present propulsion box 1, the thrust transmission member 10 of the subsequent propulsion box 1 (denoted by reference numeral 1 </ b> B) is placed on the rear joining end surface 1 b of the preceding propulsion box 1 (denoted by reference numeral 1 </ b> A). When the lateral wall convex portion 10A is pressed, the thrust transmission member 10 is compressed by its elastic force and is in contact with the rear joining end face 1b.
At this time, each step portion in the lateral wall convex portion 10A is elastically deformed corresponding to the rear joint end surface 1b, so that the contact area between the rear joint end surface 1b and the lateral wall convex portion 10A can be increased. The power transmission efficiency can be further improved.

Next, the effect | action of the propulsion box 1 comprised in this way is demonstrated based on drawing.
As shown in FIG. 5, when the propelling box 1 propels the tunnel straight portion, the thrust transmission member 10 comes into contact with the rear joining end face 1b in a state of being almost uniformly compressed by its elastic deformation. That is, the propulsive force can be transmitted in the tunnel axial direction (propulsion direction) from the subsequent propulsion box 1B to the preceding propulsion box 1A via the thrust transmission member 10 in the entire joint end surface. Here, the symbol O shown in FIG. 5 indicates the propulsion axis direction of the propulsion boxes 1A and 1B.

  Further, as shown in FIG. 6, when the propulsion box 1 propels the tunnel curved portion, the propulsion boxes 1A and 1B adjacent to each other in the propulsion direction are bent at a predetermined angle (reference sign θ shown in FIG. 6). Will be promoted in the state. Here, in FIG. 6, the symbol O indicates the propulsion axis of the subsequent propulsion box 1B, and the symbol O ′ indicates the propulsion axis of the preceding propulsion box 1A.

  In the tunnel curved portion, the distance between the joint end faces 1a and 1b becomes small on the inner side S (center side of the radius of curvature) of the tunnel curved portion, so that the lateral wall convex portion 10A of the thrust transmission member 10 is elastically deformed. Compress. On the other hand, on the outer side T (on the side opposite to the center side of the radius of curvature), the separation between the joining end faces 1a and 1b becomes large, so that there is a gap between the lateral wall convex portion 10A and the rear joining end face 1b. . And in the horizontal direction center part of 10 A of horizontal wall convex parts, although the separation | separation of joining end surface 1a, 1b becomes large, since the center part is the shape which protrudes the most front side, it restore | restores (expands) corresponding to the said separation ). That is, the lateral wall convex portion 10A is in contact with the rear joining end surface 1b in the range from the inside in the radius of curvature of the joining end faces 1a and 1b to the center in the transverse direction. Therefore, the propulsive force can be transmitted via the thrust transmitting member 10 in the radius direction inner side range of the joint end face where the propulsive force is concentrated in the curved curve portion.

  As described above, in the tunnel curved portion, the range in which the driving force is concentrated on the inner side in the radius of curvature at the joint end surface, that is, the lateral wall convex portion 10A is compressed and restored, and the rear joint end surface 1b in the inner region from the lateral central portion. Therefore, the propulsive force can be transmitted efficiently. In addition, since the lateral wall convex portion 10A serves as a cushioning material between the adjacent propelling boxes 1A and 1B, the joint end surface located on the inner side in the radius of curvature at the tunnel curved portion as in the prior art. It is possible to prevent the propulsion box from being damaged due to the concentration of the propulsive force.

  As described above, in the propulsion box structure according to the present embodiment, in the tunnel curved portion, the range in which the propulsive force is concentrated on the inner side in the curvature radius direction at the joint end faces 1a and 1b, that is, the lateral wall convex portion 10A is compressed and elastically deformed. It is possible to restore and maintain a state where there is no gap in contact with the rear joining end face 1b in the inner range from the lateral center, and the joining end face without reducing the contact area between the joining end faces in the range. Since it can transmit evenly in the whole range and it can transmit reliably to the shield excavator 2 of a front-end | tip part, a propulsion transmission efficiency can be improved.

Next, modifications of the embodiment of the present invention will be described with reference to FIGS. 7 to 9, but the same or similar members and parts as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted. A configuration different from that of the embodiment will be described.
FIG. 7 is a plan view showing a propulsion box structure according to a first modification of the present embodiment, corresponding to FIG.
As shown in FIG. 7, in the first modification, in the embodiment, the thrust transmission member 10 is formed with a lateral wall convex portion 10 </ b> A (see FIG. 3) having a step shape. The lateral wall convex portion 10C having a trapezoidal shape is provided. That is, the joint end surfaces 1a and 1b are in contact with each other by compressing the trapezoidal lateral wall convex portion 10A with respect to the rear joint end surface 1b.

FIG. 8 is a plan view showing a propelling box structure according to a second modification, and corresponds to FIG.
As shown in FIG. 8, in the second modification, the thrust transmission member 10 has a lateral wall convex portion 10 </ b> A (see FIG. 3) formed in a step shape in the embodiment. It has a configuration in which a lateral wall convex portion 10D having an arc surface is provided. That is, the joint end surfaces 1a and 1b come into contact with each other by compressing the arc-shaped lateral wall convex portion 10D with respect to the rear joint end surface 1b.

FIG. 9 is a side view showing a propelling box structure according to a third modification, corresponding to FIG.
As shown in FIG. 9, in the third modification, a step portion is formed instead of the vertical wall flat plate portion 10B (see FIG. 4) in the vertical wall portions 13 and 14 of the embodiment. In other words, the thrust transmission member 10 is formed with a vertical wall convex portion 10E in which the vertical center portions of the vertical wall portions 13 and 14 protrude. The vertical wall convex portion 10E is formed in a step shape from both longitudinal end portions to the central portion, and is formed of an elastic material.

  In the third modified example, it is possible to correspond to the tunnel curve portion as in the embodiment, and in addition, the preceding propelling box 1A is inclined upward or downward with respect to the following propelling box 1B. Even in the case of propulsion, the vertical wall convex portion 10E is appropriately compressed and restored by elastic deformation according to the position of the propelling box, and maintains a state in which it is in contact with the rear joining end face 1b without any gap. Therefore, it is possible to transmit the entire joint end face evenly and reliably to the excavator at the tip.

As mentioned above, although embodiment and modification of the propelling box structure according to the present invention have been described, the present invention is not limited to the above embodiment and modification, and can be appropriately changed without departing from the scope of the present invention. It is.
For example, the shape, thickness and the like of the thrust transmission member can be appropriately set according to conditions such as the size of the propulsion box and the radius of curvature of the tunnel curve portion.

It is a perspective view which shows the outline | summary which constructs a large section tunnel, installing the propulsion box by embodiment of this invention. It is a perspective view which shows the joining structure of the propulsion boxes shown in FIG. It is a top view of the joining structure of the propulsion box shown in FIG. It is a side view of the joining structure of a propulsion box. It is a top view which shows the state of the propulsion box at the time of a tunnel linear part propulsion. It is a top view which shows the state of the propulsion box at the time of tunnel curve part propulsion. It is a top view which shows the propulsion box structure by the 1st modification of this Embodiment, Comprising: It is a figure corresponding to FIG. It is a top view which shows the propulsion box structure by a 2nd modification, Comprising: It is a figure corresponding to FIG. It is a side view which shows the propulsion box structure by a 3rd modification, Comprising: It is a figure corresponding to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B Propulsion box 1a Front joint end surface 1b Back joint end surface 10 Thrust transmission member 10A, 10C, 10D Horizontal wall convex part 10E Vertical wall convex part 11, 12 Horizontal wall part 13, 14 Vertical wall part

Claims (3)

A plurality of propulsion boxes arranged in a rectangular frame shape by arranging a pair of upper and lower horizontal wall portions and a pair of left and right vertical wall portions in a rectangular frame shape, and abutting the joining end surfaces of the propulsion boxes. A propelling box structure to be propelled,
The propulsion box is provided with a thrust transmission member having elasticity in the entire range of the joint end face on one end side,
The thrust transmission member is formed with a lateral wall convex portion projecting from a lateral center in the lateral wall portion,
The propulsion box structure is characterized in that the thrust transmission member can be compressed and restored in a state in which the lateral wall convex portion is brought into contact with the joint end surface on the other end side of the propulsion box.   The propelling box structure according to claim 1, wherein the lateral wall convex portion is formed in a stepped shape from both lateral end portions toward a central portion.   The propelling box structure according to claim 1 or 2, wherein a vertical wall convex portion is formed on the vertical wall portion by projecting a central portion in the vertical direction on the thrust transmission member.

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