JP2021139145A - Formwork support structure for tunnel center - Google Patents

Abstract

To provide a formwork support structure for a tunnel center that does not exert a large twisting force on an elevating jack when a lateral movement mechanism is activated and can prevent its damage.SOLUTION: In a tunnel center having a frame 1, which is rectangular in plan view and supports a formwork TF curved in an arc along an inner wall of a tunnel, on a carriage 5 movable in the tunnel extension direction, and the frame 1 is supported by lifting jacks 2 at its four corners, a lateral movement mechanism 3 that moves a base end in a tunnel width direction in a straight line, and a longitudinal movement mechanism 4, which is positioned on top of the lateral movement mechanism 3 and enables the base end to move in a direction intersecting a movement direction of the lateral movement mechanism 3, are interposed between the carriage 5 and the base end of the lifting jack 2, which supports both ends in the tunnel width direction of at least one of the front and rear positions in the tunnel extension direction of the frame 1.SELECTED DRAWING: Figure 2

Description

The present invention relates to a formwork support structure of a tunnel center, and more particularly to a formwork support structure provided with a lateral movement mechanism for moving the formwork in the tunnel width direction.

Patent documents for tunnel centles that have a formwork shaped along the inner peripheral wall of the tunnel and move in the longitudinal direction of the tunnel to form a secondary lining concrete placement space between the outer circumference of the formwork and the inner circumference of the tunnel. Some have a lateral movement mechanism as shown in 1. The lateral movement mechanism moves the formwork in the tunnel width direction when the formwork device and the tunnel design are misaligned due to an error of the moving rail or the like. It is corrected and adjusted by moving it.

Japanese Patent Application Laid-Open No. 7-91050

By the way, lateral movement mechanisms may be provided at both front and rear ends in the tunnel extension direction on the moving carriage of the tunnel center, and jacks for raising and lowering are provided on each lateral movement mechanism, and the top frame of the formwork is provided by the jacks. I support it. Normally, a substantially quadrangular underframe is provided to support the top frame integrally with the top frame, and the four corners of the underframe are supported by elevating jacks provided on the lateral movement mechanism.

In this case, it is necessary to adjust the orientation of the mold according to the alignment of the tunnel regardless of the position of the moving carriage, and each lateral movement mechanism provided at the front-rear position in the tunnel extension direction is moved in the opposite direction to the underframe, that is, The top frame is swiveled, and along with this swivel, the tip of the elevating jack that supports the underframe acts in a direction that intersects the linear movement direction due to the lateral movement mechanism of the base end of the elevating jack. , There is a problem that a large twisting force acts on the elevating jack and the elevating jack and the lateral movement mechanism are often damaged.

Therefore, the present invention solves such a problem, and provides a formwork support structure for a tunnel center that can prevent damage to the elevating jack without a large twisting force acting on the elevating jack when the lateral movement mechanism is operated. To aim

In order to achieve the above object, in the first invention, a substantially square shape in a plan view is supported on a trolley (5) that can move in the tunnel extension direction and a mold (TF) that curves in an arc shape along the inner wall of the tunnel. In a tunnel centle provided with the underframe (1) and supported by the elevating jacks (2) at its four corners, at least one of the front and rear positions of the underframe (1) in the tunnel extension direction. A lateral movement mechanism (3) for linearly moving the base end in the tunnel width direction between the base end of the elevating jack (2) supporting both ends in the tunnel width direction and the carriage (5), and the lateral movement mechanism ( A vertical movement mechanism (4, 6) that is positioned so as to overlap the 3) and enables the base end to be moved in a direction intersecting the movement direction of the lateral movement mechanism (3) is interposed.

In the first invention, when the lateral movement mechanisms provided at at least one of the front-rear positions in the tunnel extension direction are operated, or the lateral movement mechanisms provided at both the front-rear positions in the tunnel extension direction are operated in opposite directions, the underframe It turns while being slightly deformed, and the tip of the elevating jack that supports the underframe moves in a direction intersecting the linear movement direction by the lateral movement mechanism of the base end of the elevating jack. Here, by providing the vertical movement mechanism, the base end of the elevating jack can follow the tip and move in the above-mentioned intersecting direction. The twisting force generated in the jack is kept small.

In the second invention, the vertical movement mechanism is a vertical slide mechanism (4) that allows free linear movement at the base end.

In the second invention, the vertical movement mechanism can be realized with a simple configuration.

In the third invention, a shaft body (14) for rotating the underframe (1) around the center of the underframe (1) is provided.

In the third invention, it is possible to regulate the unregulated longitudinal movement displacement of the underframe supported by the elevating jack.

In the fourth invention, the vertical movement mechanism is a guide mechanism that allows arc-shaped movement around a shaft body (61) provided at the center of the underframe (1) in the tunnel width direction at the base end. 6).

In the fourth invention, the base end can be satisfactorily followed with the movement of the tip of the elevating jack accompanying the turning movement of the underframe.

The reference numerals in parentheses indicate the correspondence with the specific means described in the embodiments described later for reference.

As described above, according to the formwork support structure of the tunnel center of the present invention, since a large twisting force does not act on the elevating jack when the lateral movement mechanism is operated, it is possible to prevent the breakage.

It is a top view of the underframe in the 1st Embodiment of this invention. It is a side view of arrow A of FIG. It is a side view of a horizontal movement jack and a vertical slide mechanism. It is a side view of the horizontal movement jack and the vertical slide mechanism when the guide mechanism is operated. It is a schematic plan view at the time of lateral movement of the underframe on the bogie. It is a schematic plan view at the time of lateral movement of the underframe on the bogie. It is a top view which shows the positional relationship between a guide mechanism and an underframe in the 2nd Embodiment of this invention. It is the front view of the arrow B of FIG.

The embodiments described below are merely examples, and various design improvements made by those skilled in the art within the scope of the present invention are also included in the scope of the present invention.

(First Embodiment)
FIG. 1 shows a plan view of the underframe 1 that supports the top frame TF (FIG. 2) constituting the formwork of the tunnel center, and FIG. 2 shows a side view of the arrow A in FIG. The underframe 1 has a substantially horizontally long quadrangle in a plan view, and the vertical direction in FIG. 1 is the extension direction of the tunnel. The underframe 1 includes a plurality of pedestals 11 extending in the tunnel width direction at intervals in the tunnel extension direction, and pedestal support beams 12 provided at central left and right positions orthogonal to these pedestals 11. The pedestal beam 11 is fixed to the lower surface of a pair of main beams 13 extending in the tunnel extension direction at the left and right end positions in the tunnel width direction.

The lower surface of the front and rear ends of the main beam 13 in the tunnel extension direction is recessed upward in a mountain shape (FIG. 2), and the recessed portion 131 is a lifting jack 2 as a lifting mechanism and a lateral movement mechanism described in detail later. It is supported on the girder 51 of the lower moving carriage (gantry) 5 via the laterally moving jack 3 and the vertical sliding mechanism 4 as the vertical moving mechanism.

FIG. 3 shows the details of the lateral movement jack 3 and the vertical slide mechanism 4. The lateral movement mechanism 3 has a known structure, and its input rotary shaft 31 is connected to a drive motor (not shown). When the input rotary shaft 31 is rotationally driven in one direction, a slider 32 is driven by an internal screw mechanism. Is linearly moved to the front side of the paper (in the direction of the tunnel width on the right side of the paper in FIG. 1), and when the input rotation shaft 31 is rotationally driven in the other direction, the slider 32 is moved to the back side of the paper (in FIG. 1 on the left side of the paper). It can be moved linearly in the direction of the tunnel width). The vertical slide mechanism 4 is mounted on the slider 32, and the vertical slide mechanism 4 raises and lowers the jack in the left-right direction of FIG. 3 (in FIG. 1, the tunnel extension direction in the vertical direction of the paper surface) orthogonal to the moving direction of the slider 32. The base end of 2 can slide freely within a certain range. An example of the moved state is shown in FIG.

Further, in the present embodiment, as shown in FIGS. 1 and 2, the shaft body 14 is projected from the lower central surface of the pedestal beam 11 at the center of the tunnel extension direction, which is the center of the underframe 1, and the shaft body 14 is downward. It is located in the guide groove 521 of the guide member 52 provided on the upper surface of the gantry 5 of the above. The guide groove 521 has a width substantially the same as the diameter of the shaft body 14, and extends in the tunnel width direction (left-right direction in FIG. 1) with a constant dimension. As a result, the underframe 1 can be swiveled around its center and can be moved in the tunnel width direction within a certain range.

With such a structure, for example, the base end of the elevating jack 2 on one end side is set by lateral movement mechanisms 3 provided on both left and right sides of the underframe 1 in the tunnel extension direction (upper end in FIG. 5) along the curvature of the tunnel. The other end is linearly moved to one side in the tunnel width direction by a distance X ((white arrow in FIG. 5)), and the other end is provided by lateral movement mechanisms provided on both sides of the underframe 1 in the tunnel extension direction (lower end in FIG. 5). When the base end of the elevating jack 2 on the side is linearly moved by the same amount in the tunnel width direction in the direction opposite to the one end side (white arrow in FIG. The frame body including the TF) is swiveled from the solid line position in FIG. 5 to the broken line position around the shaft body 14 while slightly deforming the quadrangle.

At this time, as the underframe 1 turns, the tips of the elevating jacks 2 move in the tunnel extension direction by the distance Y shown in FIG. 5 with respect to the respective base ends. Therefore, if there is no vertical slide mechanism, the elevating jacks 2 move up and down. A large twisting force acts on the jack. Here, in the present embodiment, since the base end of each elevating jack 2 can be freely moved in the tunnel extension direction by the vertical slide mechanism 4, the base end of each elevating jack 2 is based on the deformation turning of the underframe 1. The end also moves by a distance Y following the movement of the tip, the tip and the base end of each elevating jack 2 are substantially aligned in a plan view, and the upright posture of the elevating jack 2 is substantially maintained. As a result, the twisting force generated in each elevating jack 2 can be suppressed to a small value.

The amount of movement of the lateral movement mechanism 3 on both sides of the underframe 1 in the tunnel extension direction (upper end in FIG. 6) (white arrow in FIG. 6) is the amount of movement of the lateral movement mechanism 3 on both sides of the other end (lower end in FIG. 6). When it is larger than (white arrow in FIG. 6), as shown in FIG. 6, the underframe 1 moves around the shaft body 14 while moving in the tunnel width direction within the range in which the shaft body 14 can move along the guide groove 521. Displace and turn to. Also in this case, the base end of each elevating jack 2 is moved by the vertical slide mechanism 4 by the distance Y'in the tunnel extension direction following the movement of the tip at the same time as the movement of the distance X'by the lateral movement mechanism. As a result, the tip end and the base end of each elevating jack 2 are substantially aligned with each other in a plan view, and the twisting force of each elevating jack 2 is suppressed to be small.

In the present embodiment, even when only the lateral movement mechanism 3 on both sides of one end of the underframe in the tunnel extension direction is operated and the other lateral movement mechanism 3 is stopped, the underframe 1 is still the same. Since the quadrangle is deformed and swiveled, the twisting force generated in each elevating jack 2 can be suppressed to be small by the above structure.

(Second Embodiment)
7 and 8 show other examples of the formwork support structure. 7 is a schematic plan view of the formwork support structure, and FIG. 8 is a front view taken along the line B of FIG. 7. In each drawing, the elevating jacks 2 (FIG. 8) that support both ends of the underframe 1 (see FIG. 1) in the tunnel extension direction and both ends of the other end are the ends of the gantry 5 (see FIG. 2) in the tunnel extension direction. It is located on each of the guide mechanisms 6 provided above.

That is, in the present embodiment, the guide mechanism 6 as the vertical movement mechanism includes a frame body 62 whose center is rotatably connected to the gantry 5 (see FIG. 2) by the shaft body 61 and extends in the tunnel width direction. Receiving members 63 that enable smooth turning of the frame body 62 while receiving a load are arranged on the lower surfaces of both ends of the body 62. As the receiving member 63, a bearing member or the like using a rolling element can be used. The known lateral movement mechanisms 3 described in the first embodiment are provided on both ends of the frame body 62, and the elevating jacks 2 are erected on each lateral movement mechanism 3.

When the lateral movement mechanisms 3 provided on both ends of the underframe 1 in the tunnel extension direction are moved in opposite directions in the tunnel width direction in order to make the formwork follow the curvature of the tunnel, the underframe is accompanied by this. 1 is swiveled from the solid line position in FIG. 7, for example, to the broken line position while slightly deforming the quadrangle. Along with this, the tip of each elevating jack 2 swivels, and the base end of each elevating jack 2 is such that the frame body 62 constituting the guide mechanism 6 can swivel around each shaft body 61. It moves freely following the movement of the tip of each elevating jack 2, and the tip and base end of each elevating jack 2 are always substantially aligned in plan view. As a result, the twisting force generated in each elevating jack 2 can be suppressed to a small value.

(Other embodiments)
In each of the above embodiments, the lateral movement mechanism may be provided only at one end in the tunnel extension direction.
Further, although the vertical movement mechanism is a passive mechanism in the above embodiment, it may be a mechanism for actively moving the mechanism manually or by a driving means such as a motor. When the active movement mechanism is used, the drive means can be operated and controlled so as to calculate or detect the twisted (tilted) posture of the elevating jack and correct it.

1 ... Underframe, 14 ... Shaft, 2 ... Lifting jack, 3 ... Horizontal movement mechanism, 4 ... Vertical slide mechanism (vertical movement mechanism), 5 ... Gantry (trolley), 6 ... Guide mechanism (vertical movement mechanism), 61 ... Shaft, TF ... Heaven form (form).

Claims (4)

A substantially square underframe is provided on a trolley that can move in the longitudinal direction of the tunnel extension to support an arc-shaped curved form along the inner wall of the tunnel, and the underframe is supported by elevating jacks at its four corners. In the tunnel center, the base end is placed between the base end of the elevating jack and the trolley that support both ends in the tunnel width direction, which is a pair of at least left and right positions of the underframe in the tunnel extension direction. A tunnel intervening a lateral movement mechanism that linearly moves in a direction and a vertical movement mechanism that is positioned so as to overlap the lateral movement mechanism and enables the base end to move in a direction intersecting the movement direction of the lateral movement mechanism. Centle mold support structure. The formwork support structure for a tunnel centle according to claim 1, wherein the vertical movement mechanism is a vertical slide mechanism that allows free linear movement at the base end. The formwork support structure for a tunnel centle according to claim 2, wherein a shaft body for rotating and moving the underframe around the center of the underframe is provided. The formwork of the tunnel center according to claim 1, wherein the vertical movement mechanism is a guide mechanism that allows arc-shaped movement centered on a shaft body provided at the center of the underframe in the tunnel width direction at the base end. Support structure.

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