JP7079702B2 - Centre rail delivery system, and centre - Google Patents

Description

The present invention relates to a center rail delivery system and a center.

Conventionally, in mountain tunnels, concrete is placed in the circumferential direction of the tunnel behind the ground of the tunnel wall surface near the excavated face, after the primary support such as steel support, sprayed concrete, and rock bolts has been constructed. Is building a lining. In the construction of such lining concrete, a mobile lining formwork (centre) is generally used, and concrete is placed between the ground where the primary support was carried out and the formwork (for example). , Patent Document 1).

In such a centle, concrete lining is performed while repeatedly relocating in the direction of tunnel travel at regular span intervals. When moving the center, the center body having wheels is moved along the rail for the center laid on the roadbed surface of the tunnel. At this time, since the center rail is laid only at the position where the center can be relocated, the center rail is also replaced along with the relocation of the center.

Japanese Unexamined Patent Publication No. 10-37689

However, in the conventional refilling work of the center rail, since the weight of the rail is heavy, it has been moved due to time-consuming and labor-intensive work such as using a heavy machine. Moreover, during the rail replacement work, the replacement location may be closed, which has a large impact on other work and reduces the work efficiency of the entire construction, so there is room for improvement in that respect. rice field.

The present invention has been made in view of the above-mentioned problems, and it is possible to suppress the occupation of the work space without using heavy machinery, the center can be moved efficiently, and the working time can be reduced. It is an object of the present invention to provide a centre rail delivery system that can be reduced, and a centre.

In order to achieve the above object, the center rail delivery system according to the present invention is a center rail delivery system provided in a center body having a mold for placing tunnel concrete, and is provided in the center body and is provided in a tunnel path. It is provided with a wheel that rolls along a rail laid on the board surface, a rail holding portion that holds the rail so as to be movable in the direction of the tunnel axis, and an elevating device that raises the centre body together with the rail. When the center body is raised by the apparatus, the rail is held in the vertical direction by the rail holding portion and is sent out in the tunnel traveling direction.

Further, the center according to the present invention includes a center body having a mold for placing tunnel concrete, wheels provided on the center body and rolling along a rail laid on the roadbed surface of the tunnel, and the rail. The rail is provided with a rail holding portion that movably holds the center in the direction of the tunnel axis, and an elevating device that raises the centre body together with the rail. It is characterized in that it is sent out in the tunnel traveling direction while being held in the vertical direction by the holding portion.

In the present invention, when the center rail for moving the center is replaced, the elevating device raises the rail held by the rail holding portion on the center body together with the center body. At this time, the rail is located above the roadbed surface and is held in a state where it can be moved in the direction of the tunnel axis with respect to the rail holding portion, so that the rail can be easily directed to the next casting span by human power. Can be sent out. Then, when the rail has been sent out, the rail can be replaced by lowering the rail together with the center body by the elevating device and grounding the rail on the roadbed surface. After that, the center can be relocated by moving the center body to the next casting span along the rail grounded to the roadbed surface.
As described above, in the present invention, since it is not necessary to replace the rails by using a heavy machine as in the conventional case, the center can be efficiently moved and the working time can be reduced. Moreover, it is possible to prevent the work space from being occupied by heavy machinery for replacing rails, and it is possible to reduce the influence on other work, so that the work efficiency of construction can be improved. , The construction period can be shortened.

Further, in the center rail feeding system according to the present invention, the rail holding portion is arranged so as to sandwich the web of the rail from both the left and right sides so as to be close to each other, and the roller rotation axis is oriented in the vertical direction to grip a pair of rails. The roller may be characterized in that the rail gripping roller is arranged at a non-holding position separated from the web when the center of the center is moved along the rail at the time of placing concrete.

In this case, when the rail is fed, the rail gripping roller of the rail holding portion that holds the rail rotates, so that the rail can be smoothly fed by a small frictional force, and the burden on the operator can be reduced. ..
Further, when the center body is moved along the rail, the rail gripping roller can be separated from the web of the rail to be in the non-holding position, so that the center body can be smoothly run.

According to the center rail feeding system and the center of the present invention, it is possible to suppress the occupation of the work space without using heavy machinery, the center can be moved efficiently, and the working time is reduced. be able to.

It is a front view seen from the tunnel direction which shows the structure of the centre by embodiment of this invention. 1 is an enlarged view of a main part showing the configuration of the center rail delivery system in FIG. 1, in which FIG. 1A is a view showing a state of being gripped by a rail gripping roller, and FIG. 1B is a view showing a state of being gripped by a rail gripping roller. It is a side view of the centle shown in FIG. It is a figure which shows the state which refilled the rail, and is the front view which shows the state which raised the centre main body and a rail by an elevating device. (A) to (c) are side views schematically showing the rail replacement process. (A) and (b) are side views schematically showing the rail replacement process following FIG. 5 (c).

Hereinafter, the center rail delivery system and the center according to the embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, in the construction of a mountain tunnel such as the NATM method, the centre 1 according to the present embodiment excavates the ground and covers the excavated wall surface with sprayed mortar (sprayed concrete) or lock bolts. The purpose is to construct a tunnel lining by placing the lining concrete 2 at a predetermined lining position after placing the concrete or installing the waterproof sheet. The center 1 has, for example, an arch formwork 11 corresponding to a span having a length of about 10 to 12 m in the tunnel axial direction X1 (see FIG. 3).

Here, in the center 1, the traveling direction in which the lining concrete 2 is placed in the tunnel axial direction X1 is referred to as "tunnel traveling direction", "front side", and "front", and the opposite directions are referred to as "rear side" and "rear side". "Backward". In FIGS. 3, 5 and 6, the left side of the paper surface is the face side, and the centre 1 is relocated from the right side of the paper surface to the left side to construct the lining concrete 2.

The center 1 is formed in an arch shape along the tunnel circumferential direction of the excavation wall surface 2A, and is divided into three parts in the circumferential direction. And the wheel 12 provided on the center body 10 and rolling along the rail 3 laid on the roadbed surface 2B of the tunnel, and the rail gripping roller 4 (rail holding) that movably holds the rail 3 in the tunnel axial direction X1. Section) and an elevating device 5 for raising the center body 10 together with the rail 3.

As shown in FIGS. 2A and 2B, the rail 3 is integrally fixed to the bottom plate 30a of the channel steel 30 extending along the rail 3 in a U-shape in cross-sectional view with the opening facing upward. ing. The rail 3 has the length dimension of at least two centrues 1 (the length of two spans in the concrete casting span by the centre 1). The channel steel 30 also has the same length as the rail 3. The bottom plate 30a has a flat surface, and the rail 3 is arranged in a stable posture by grounding the bottom plate 30a on the roadbed surface 2B of the tunnel. That is, the rail 3 does not require sleepers and is not fixed by a rail clip or the like.

As shown in FIGS. 1, 3 and 4, the center body 10 includes a support carriage 13 framed in a gate shape when viewed from the tunnel axial direction X1 and an upper work platform 14 provided on the support carriage 13. A formwork jack 15 provided on the support carriage 13 and supporting the arch formwork 11 so as to be able to reduce the diameter is provided.

The support carriage 13 supports the air pipe and the conveyor for excavation and excavation on the empty side of the tunnel so as to be able to pass through. At the lower end of each leg portion 13A, a pair of wheel support pedestals 16 for rotatably supporting the wheel 12 are provided on both sides of the wheel 12. On the empty side of the tunnel of the support carriage 13, a space through which a vehicle such as a truck can pass is secured.
The leg portion 13A is provided with an elevating jack 17 that can move up and down. With the support carriage 13 mounted on the rail 3, the elevating jack 17 is driven to expand and contract up and down, so that the upper arch portion 11A of the arch form 11 can be moved between the casting position and the demolding position. can. The side arch portion 11B is connected to the upper arch portion 11A via a hinge portion 11a, and is provided so as to be foldable on the empty side inside the tunnel with the hinge portion 11a as the center.

As shown in FIGS. 2A and 2B, the pair of rail gripping rollers 4 have their respective roller rotation shafts 4a arranged in the vertical direction and slide on the lower surface 16a of the wheel support pedestal 16 of the leg portion 13A. It is provided via a guide portion 41. The slide guide portion 41 is supported by a fixing piece 42 fixed to the lower surface 16a of the wheel support pedestal 16 in a state where the slide direction X2 is directed in a direction orthogonal to the rail 3 when viewed from above. In the rail gripping roller 4, the holding portion 43 for holding the roller rotating shaft 4a from both the upper and lower sides sandwiching the rail gripping roller 4 is guided by the slide guide portion 41 so as to be sandwiched from the left and right sides with respect to the web 32 of the rail 3. The structure is such that the rails can be separated from each other and can slide between the holding position Q1 shown in FIG. 2A and the non-holding position Q2 shown in FIG. 2B.

As a result, as shown in FIG. 2B, the rail gripping roller 4 uses the rail gripping roller 4 as the web 32 of the rail 3 when the center body 10 is arranged in the raised position at the time of placing concrete and when the rail gripping roller 4 is moved up and down. It can be separated from the holding position Q1 to the non-holding position Q2. When the rail gripping roller 4 is in the non-holding position Q2, the roller inner end 4b is located away from the rail head 31 when viewed from the rail axis direction, and when the center body 10 is raised, the rail gripping roller 4 moves to the rail head. It can be evaded upward without interfering with the portion 31.

A plurality of elevating devices 5 are provided on the center body 10, and have cylinders 51 that can be expanded and contracted up and down. The lower end of the cylinder 51 is grounded to the roadbed surface 2B when extended. The elevating device 5 is set so that at least the rail 3 and the channel steel 30 are lifted upward from the roadbed surface 2B when the cylinder 51 is extended.

Next, a construction method for placing concrete on the tunnel wall surface using the center rail delivery system provided in the center described above will be specifically described with reference to the drawings.
Here, as shown in FIGS. 5 (a) to 5 (c) and FIGS. 6 (a) and 6 (b), after concrete is placed in the first casting span S1 using the centre 1, the first casting is performed. A method of relocating the centre 1 from the span S1 to the next second casting span S2 will be mainly described.

First, FIG. 5A shows a state in which the arch formwork 11 is removed after the concrete placement is completed and the concrete is cured in the first casting span S1. After that, the rail 3 is replaced.
Specifically, as shown in FIG. 2A, the web 32 of the rail 3 is sandwiched between the pair of rail gripping rollers 4 to set the holding position Q1, and then as shown in FIGS. 4 and 5B. The cylinder 51 of the elevating device 5 is extended to raise the center body 10 together with the rail 3. That is, when the center body 10 is raised by the elevating device 5, the pair of rail gripping rollers 4 connected to the center body 10 are also raised. At the time of this ascent, the rail gripping roller 4 lifts the rail head 31 from below, so that the rail 3 having the channel steel 30 also rises to a position away from the roadbed surface 2B upward.

Next, as shown in FIG. 5C, the rail 3 is manually sent out toward the tunnel traveling direction E1 (left side of the paper). At this time, since the rail 3 is only held in a state of being sandwiched by the rail gripping roller 4, the rail gripping roller 4 rotates when the rail 3 is manually moved, so that the rail 3 can be easily moved. Can be moved. It is preferable to provide a stopper (not shown) for restricting movement on the rear end side of the rail 3 (the end opposite to the direction in which the rail 3 is sent out). By providing such a stopper, it is possible to prevent the rail 3 from escaping and falling off from the rail gripping roller 4 when the rail 3 is sent out. The delivered rail 3 is in a state of being extended within the region of the second casting span S2.

Next, as shown in FIG. 6A, by contracting the cylinder 51 of the elevating device 5, the rail 3 is lowered together with the center body 10 to touch the roadbed surface 2B. After that, as shown in FIG. 2B, the pair of left and right rail gripping rollers 4 are moved along the slide guide portion 41 and separated from the rail 3 to obtain the non-holding position Q2. This completes the replacement of the rail 3.

Subsequently, as shown in FIG. 6B, the centre main body 10 is moved along the rail 3 in the tunnel traveling direction to move from the first casting span S1 to the second casting span S2. As a result, the relocation of one span of the center 1 is completed, and as shown in FIG. 1, after the arch formwork 11 is expanded again and set to a predetermined arch shape, the space between the arch formwork 11 and the excavation wall surface 2A is completed. The work of placing concrete will be carried out.

Next, the center rail delivery system and the operation of the center will be described in detail with reference to the drawings.
In the present embodiment, as shown in FIG. 1, when the rail 3 for moving the center 1 is replaced, the rail held by the elevating device 5 together with the center body 10 by the rail gripping roller 4 on the center body 10. Raise 3 At this time, the rail 3 is located above the roadbed surface 2B and is held in a state of being movable in the tunnel axial direction X1 with respect to the rail gripping roller 4, so that the rail 3 can be easily hit next by human power. It can be sent out toward the set span. Then, when the delivery of the rail 3 is completed, the rail 3 can be replaced by lowering the rail 3 together with the center body 10 by the elevating device 5 and grounding the rail 3 to the roadbed surface 2B. After that, the center 1 can be relocated by moving the center body 10 to the next second casting span S2 along the rail 3 grounded to the roadbed surface 2B.

As described above, in the present embodiment, since it is not necessary to replace the rail 3 by using a heavy machine as in the conventional case, the center 1 can be efficiently moved and the working time can be reduced. Moreover, it is possible to prevent the work space from being occupied by the heavy machinery for replacing the rail 3, and it is possible to reduce the influence on other work, so that the work efficiency of the work can be improved. It can be done and the construction period can be shortened.

Further, in the present embodiment, when the rail 3 is fed, the rail gripping roller 4 holding the rail 3 rotates, so that the rail can be smoothly fed by a small frictional force, and the burden on the operator can be reduced. Can be done.
Further, when the center body 10 is driven along the rail 3, the rail gripping roller 4 can be separated from the web 32 of the rail 3 to be in a non-holding state, so that the center body 10 can be smoothly traveled. Can be done.

As described above, in the center rail delivery system and the center according to the present embodiment, it is possible to suppress the occupation of the work space without using heavy machinery, and the center can be moved efficiently, and the work can be performed. Time can be reduced.

Although the centre rail feeding system according to the present invention and the embodiment of the centre have been described above, the present invention is not limited to the above-described embodiment and can be appropriately modified without departing from the spirit of the present invention.

For example, as in the present embodiment, the rail holding portion is configured to hold the web 32 of the rail 3 so as to be sandwiched between the pair of rail gripping rollers 4 so as to be able to be separated from each other. It is not limited, and it is possible to adopt a rail holding portion having another configuration.

Further, in the present embodiment, the channel steel 30 is provided on the rail 3, but the channel steel 30 can be omitted.

Further, the configuration such as the mounting position and quantity of the rail holding portion (rail gripping roller 4) and the elevating device 5 can be appropriately changed according to the size of the tunnel cross section, the weight, size, shape, etc. of the center body 10. ..

In addition, it is possible to replace the constituent elements in the above-described embodiment with well-known constituent elements as appropriate without departing from the spirit of the present invention.

1 center 2 lining concrete 2A excavated wall surface 2B roadbed surface 3 rail 4 rail gripping roller (rail holding part)
4a Roller rotating shaft 5 Elevating device 10 Center body 11 Arch formwork 30 Channel steel 32 Rail web 41 Slide guide part 51 Cylinder S1 1st casting span S2 2nd casting span Q1 Holding position Q2 Non-holding position

Claims (3)

It is a center rail delivery system installed in the center body having a formwork for placing tunnel concrete.
Wheels provided on the center body and rolling along rails laid on the roadbed surface of the tunnel,
A rail holding portion that movably holds the rail in the direction of the tunnel axis,
An elevating device that raises the center body together with the rail,
Equipped with
The rail rail feeding system is characterized in that the rail held by the rail holding portion is provided so as to be able to be fed in the tunnel traveling direction in a state where the center body is raised by the elevating device. The rail holding portion is a pair of rail gripping rollers that are arranged so as to sandwich the web of the rail from both the left and right sides so that they can be separated from each other and the roller rotation axis is directed in the vertical direction.
The center rail delivery according to claim 1, wherein when the center body is moved along the rail at the time of placing concrete, the rail gripping roller is arranged in a non-holding position separated from the web. system. A center body with a formwork for placing tunnel concrete,
Wheels provided on the center of the center and rolling along rails laid on the roadbed surface of the tunnel,
A rail holding portion that movably holds the rail in the direction of the tunnel axis,
An elevating device that raises the center body together with the rail,
Equipped with
The rail held by the rail holding portion is provided so as to be able to be sent out in the tunnel traveling direction in a state where the center body is raised by the elevating device.

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