JPH0627998U - Erector - Google Patents

Abstract

(57) [Summary] [Problem] To provide an erector that has a simple and compact segment pushing means, has high work efficiency, and pushes up the B segment to an optimum state to smoothly attach the key segment. [Structure] The erector 10 has a grip means 17 such as a segment Sk on a erector frame 15 that can be moved by rotation, etc., and is provided in the rear part of a tunnel excavator to construct a segment wall inside the excavated tunnel. . At a position on the erector frame 15 near the gripping means 17,
The segment pushing-up means 20 of a type that expands and contracts in the radial direction of the tunnel is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an erector attached to a tunnel excavator such as a shield excavator for constructing a segment wall inside an excavated tunnel.

[0002]

[Prior art]

 Construction of segment walls using an erector is generally performed by starting from the lower portion of the tunnel, stacking the segments alternately on the left and right, and connecting them to each other with bolts or the like to form a ring. The lower segment is a normal segment called the A segment, but the upper segment that is finally attached is the key segment that is formed so that it can be easily inserted between the segments on both sides. The segment located at is called a B segment, which is partially different in shape from the A segment due to the connection with the key segment. That is, the connecting end surface between the key segment and the B segment is a tapered surface whose distance decreases outward in the radial direction so that the key segment can be inserted in the radial direction (outward direction) between the B segments previously mounted. Or a wedge-shaped (wedge-shaped) taper in the axial direction so that the key segment can be inserted between the B segments in the axial direction (from the unfinished side to the finished side). It has become).

The key segment is usually attached to the upper part of the tunnel by supporting the B segments on both sides upward, except when digging a tunnel having a diameter large enough to equip a perfect circle holding device. Is. Before the key segment is attached, the B segment is not in a sufficiently fixed state, so that the tip of the B segment hangs down and the distance between the faces becomes small, making it difficult to insert the key segment. If it is forcibly inserted while it hangs down, some of the segments may be damaged. This is the same regardless of whether the key segment is inserted in the radial direction or the wedge shape inserted in the axial direction.

An erector having means for pushing up the B segment at the time of attaching the key segment has already been disclosed in JP-B-60-33200, JP-B-63-141297 and JP-63-141298. . In each case, the movable (including rotation along the inner surface of the tunnel) erector frame with the segment gripping means or its base (the part that does not expand or contract in the radial direction) swings using the retractable jack as the drive source. A swing arm type support member is arranged as a means for pushing up the segment.

[0005]

[Problems to be solved by the device]

 The erector described in the above publication has room for improvement in the following points. That is, (b) the segment pushing-up means functions by converting the expansion / contraction motion of the jack into the swinging motion of the support member, and therefore has a complicated structure.

(B) In the same means, it cannot be said that the force or work input to the jack is used very efficiently for pushing up the segment. This is also related to the item described in (a) above, which causes mechanical loss (mechanical loss) along with the conversion of operation, and not only the direction of the force of the jack but also the direction of the output of the support member does not always function. Above The reason is that it does not match the direction of required motion. Further, even though only the tip portion of the support member is a functional portion, the entire long member swings, which causes various wastes such as loss of space utilization.

C) The above-mentioned pushing-up means is arranged on both sides (positions spaced apart in the circumferential direction of the tunnel) between which the gripping means of the segment is sandwiched, and its support member is usually gripped when pushing up the segment. Since it swings away from the means, the portion of the B segment close to the key segment cannot be pushed, and the desired push-up state may not be realized.

The present invention has been made for the purpose of improving the above points.

[0009]

[Means for Solving the Problems]

 The erector of the present invention has a segment gripping means on an erector frame that can move (turn) and is installed at the rear of a tunnel machine (various tunnel machines including shield machine). , Which is an erector that constructs a wall with a segment inside the excavated tunnel, but a segment push-up method that expands and contracts in the radial direction of the tunnel (generally in that direction) to a position near the above-mentioned gripping means on the erector frame. Means are provided.

[0010]

[Action]

 The erector of the present invention has the following features in operation.

A) The segment pushing-up means extends or contracts substantially in the radial direction of the tunnel, and pushes up the B segment by extending outward. Therefore, for example, a hydraulic cylinder or the same jack (or an electric type) may be arranged in the radial direction to perform the necessary functions, and the configuration is extremely simple.

B) The expansion / contraction operation of the segment pushing means is an operation of pushing and supporting the B segment as it is. Since the direction is not changed, the mechanical loss is small, and the direction of the force of the means (generally (Radial direction of the tunnel) is almost in line with the direction of operation required for the function of pushing up the B segment. Therefore, the thrust or work transfer efficiency of this method is high. This also leads to the ability to use a smaller drive source than before.

C) For the reasons described in a) and b) above, the segment push-up means is constructed compactly, and the operation direction is ideal, so the optimum portion of the B segment close to the key segment is pushed up. , Can be kept in the desired state.

[0014]

【Example】

 One embodiment of the present invention is shown in FIGS. 1 (a) and 1 (b) show a structure of a main part of the erector 10 and a procedure for mounting a so-called wedge-shaped key segment Sk by using the erector 10, and FIGS. () Shows the structure of the rear part of the shield machine 1 including the erector 10.

The shield machine 1 equipped with a rotary cutter (not shown) at the front end obtains propulsive force by extending the shield jack 3 shown in FIG. 2 (a) and pushing the annular segment wall that has been constructed. To dig a tunnel underground. The excavator 1 is provided with a cylindrical shield 2 around it, and the rear part of the shield 2 is equipped with an erector 10 for constructing a segment wall.

The erector 10 grips the segments S (that is, the A segment Sa, the B segment Sb, and the key segment Sk) one by one by the known gripping means 17, and attaches each to a predetermined position on the inner surface of the tunnel. It is a thing. The schematic configuration will be described below with reference to FIGS. 2 (a) and 2 (b). First, a plurality of rollers 11 are arranged inside the shield 2, and the ring drum 12 is rotatably supported by them. The drum 12 is rotated by a drive motor 4 installed in the main body of the shield machine 1 via a gear 4a and the like. A guide box 13 is integrated with the drum 12, and an expandable jack 14 is provided with an erector frame 15 movably in the radial direction of the tunnel. Further, a gripping means 17 is attached to the tip of the slide jack 16 so as to move in the axial direction of the tunnel. With this configuration, the gripping means 17 at the tip of the erector frame 15 can rotate with the ring drum 12 along the inner surface of the tunnel by an arbitrary angle, move in the radial direction by the jack 14, and by the jack 16. It can also move in the axial direction.

Now, the erector 10 is provided with two segment pushing-up means 20 as shown in FIG. The push-up means 20 serves to push up the adjacent B segments Sb when mounting the key segment Sk (described later), but it pushes up the push-up jack (hydraulic cylinder) 21 in the radial direction (radiation passing through the center of the tunnel). The feature is that it is provided on the erector frame 15 in the direction (normal direction to the surface of the segment wall). That is, when the erector frame 15 is in the position for mounting the key segment Sk at the predetermined position, the base end of each jack 21 is oriented with its telescopic end outward so that the axial length direction of the jack 21 matches the radial direction of the tunnel. Was attached to the erector frame 15. A pad 22 made of an elastic material is provided at each of the stretchable ends.

According to the erector 10 having such a structure, the segment wall can be constructed as follows.

As shown in FIG. 2, one of the A segments Sa carried in the tunnel is grasped by the grasping means 17 and rotated / moved together with the erector frame 15 to be aligned with each other, so that the A segment Sa is located at a lower portion of the inner surface of the tunnel. Install. A worker or an automatic fastening machine (not shown) connects the A segment Sa and the rearwardly-constructed segment wall with bolts or the like.

The other A segments Sa are also attached in the same manner as above by alternately contacting the end surfaces of the rear constructed segment wall and the attached A segment Sa with each other from below. Connect with the installed A segment according to the above.

At a stage where a predetermined number of A segments Sa (a total of three in the case of FIG. 2B) are attached, the grasping means 17 is caused to grasp the B segments Sb, and the attachment is performed in the same manner as described above. And connect.

When the two B segments Sb are sequentially attached to the left and right, the gripping means 17 is caused to grasp the key segment Sk, which is placed between the two B segments Sb in the axial direction as shown in FIG. 1B. Attach by inserting. At this time, 1) the slide jack 16 (FIG. 2A) is first contracted in order to insert it in the axial direction, and it is extended when it is inserted. 2) After aligning the position of the erector frame 15 by extending the telescopic jack 14 as shown in FIG. 1 (a), push up each push-up means 20 before performing the above insertion by the slide jack 16. Extend the jack 21 and push up the B segments Sb on both sides by an appropriate amount. 3) After inserting the key segment Sk between the B segments Sb, the push-up jack 21 is contracted, the key segment Sk is connected to the B segment Sb and the constructed segment wall, and the gripping means 17 Is released from the key segment Sk and the erector frame 15 is returned to its original position.

In the above, the case of using the wedge-shaped key segment Sk inserted and attached in the axial direction has been introduced, but this erector 10 is of a type that is inserted between the B segments Sb in the radial direction of the tunnel. It can also handle key segments. However, in that case, in order to insert the key segment, since the push-up jacks 21 are extended and the B segment Sb is pushed up, the telescopic jack 14 raises the gripping means 17 together with the erector frame 15, so the erector frame 15 It is necessary to contract each push-up jack 21 as it rises. The stroke of the push-up jack 21 to be reduced may be positively controlled in accordance with the extension of the telescopic jack 14, but only the maximum hydraulic pressure is set to an appropriate value with a relief valve or the like. The stroke may be freely changed so that the pressure in the jack 21 does not exceed the set pressure.

In addition, needless to say, the expansion / contraction direction of the pushing-up means does not have to be exactly the same as the radial direction of the tunnel. Even if the pushing-up means expands or contracts slightly in the radial direction of the tunnel, the thrust of the means does not act most effectively on the B segment. There is no difference in bringing significant advantages in the comparison. Further, an erector having a structure in which only one pushing-up means is arranged and its tip portion is divided into two and the two B-segments are pushed up by these tip portions also has the same effect as described above.

[0025]

[Effect of device]

 The erector of the present invention has the following advantages in addition to the effect of the conventional erector that the key segment is attached smoothly.

A) The segment pushing-up means can be simply constructed and is also compact.

B) Since the segment pushing-up means has a high efficiency of transmitting thrust and work, it is possible to use a driving source smaller than the conventional one for the means.

C) Based on the above a) and b), the optimum part of the B segment can be pushed up to the optimum state, so that the key segment can be attached smoothly.

D) Based on the above a) and b), it can be constructed at low cost.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, and FIG.
Shows a state in which the erector 10 attaches the key segment Sk together with the main structure of the erector 10 (drawing seen from the rear of the tunnel). The same (b) shows the same (a).
3 is a bb arrow view in FIG.

FIG. 2 is a shield machine 1 including the erector 10 of FIG.
2A shows a structure of a rear portion, FIG. 2A is a vertical sectional view seen from the side, and FIG. 2B is a view taken along the line bb in FIG. 2A.

[Explanation of symbols]

 1 Shield machine 10 Erector 15 Elector frame 17 Gripping means 20 Segment pushing means 21 Pushing jack Sk Key segment

Claims (1)

[Scope of utility model registration request] 1. An erector that has a segment gripping means on an erector frame that can be moved by rotation and the like and is provided at a rear portion of a tunnel excavator to construct a wall by the segment inside an excavated tunnel. An erector characterized in that a segment pushing-up means of a type that expands and contracts substantially in the radial direction of the tunnel is provided on the erector frame at a position close to the gripping means.