JP2835003B2 - Formwork equipment for tunnel lining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel lining formwork apparatus for setting lining concrete in a gap between the inside of a tunnel and the inside of the tunnel by setting the inside of the tunnel. .

[0002]

2. Description of the Related Art Inside tunnels excavated and formed by shield excavators, tunnel boring machines and other various types of tunnel excavators and various types of tunnels such as mountain tunnels, the inner wall surfaces of these tunnels are protected and protected. In order to secure a predetermined sectional shape, lining concrete is cast and formed over the inner wall surface of the tunnel. In order to cast and form these lining concretes, conventionally, a formwork for tunnel lining has been used. That is, according to this tunnel lining form, the lining form is assembled inside the inner wall surface of the tunnel along the cross-sectional shape of the planned tunnel, and the outer peripheral surface of the assembled form, that is, the form By casting the lining concrete in the gap between the surface and the inner wall surface of the tunnel, a lining body of a predetermined shape that covers the inner wall surface of the tunnel can be formed.

On the other hand, in order to form such lining concrete with good quality, concrete to be poured is filled into the gap between the formwork and the inner wall surface of the tunnel without any gap.
It is necessary to compact the filled concrete enough,
Therefore, in order to densely fill concrete in a narrow space between the formwork and the inner wall surface of the tunnel, conventionally, a method of compacting concrete poured by using a vibrator or the like has been adopted. I was

[0004] As a method using the vibrator, for example, a method in which an operator inserts a vibrator into concrete in the casting space through inspection windows provided in various places of a formwork to apply vibration, or a vibrator unit A method of compacting concrete by using a special vibrating device called “concrete vibration device” is adopted.

[0005]

However, in these conventional methods, in the method of manual operation by the worker using the vibrator, there is a concern that the finish may vary due to the skill of the worker and the like. Since the operation is performed through a small inspection window, there is a problem that it takes time and labor to perform an efficient compacting operation.

In the method using a special vibrating device such as a vibrator unit, the work of arranging the device in the tunnel is troublesome, and the device itself and the structure for controlling the device become complicated and large. However, since it is expensive, there is a problem that compaction work cannot be performed economically.

On the other hand, in view of such a conventional problem, the inventor of the present application has disclosed in Japanese Patent Application No. 5-216976 a number of reciprocatingly driving the inside and outside of a surface of a tunnel lining form, that is, a centre. Has proposed a formwork device for tunnel lining with a movable plate.

According to the formwork device for tunnel lining, each movable plate is pivotally supported by the edge of the opening window to which the movable plate is attached, and is driven to move in and out of the surface of the formwork. And the lining concrete can be compacted tightly without using a vibrator.

However, according to the formwork apparatus filed by the applicant of the present invention, since each movable plate is driven to move forward and backward by being pivotally supported by the edge of the opening window, each movable plate is moved toward the inner wall surface of the tunnel. When the movable plate is immersed, that is, when it protrudes toward the inner working space side of the tunnel, only the action of pulling in the concrete is performed separately with the advance and retreat driving, so that it only performs the action of pushing out the concrete when projecting into The extruded concrete does not lose its place of escape, and only negative pressure acts on the drawn-in concrete, which has not always been able to efficiently promote the fluidization of the surrounding concrete.

In view of the above, the present invention has been made in order to solve such a problem, and further improved the above-mentioned formwork device for tunnel lining to more tightly tighten the poured concrete for lining. It is an object of the present invention to provide a formwork apparatus for tunnel lining which can easily cast and form high-quality concrete for lining by hardening.

[0011]

To achieve the above object, a formwork device for tunnel lining according to the present invention is provided with a base point on a swing center axis which is arranged on the same surface as the surface of the formwork for tunnel lining. And a reciprocating drive mechanism for swinging the swing panel so that both sides alternately protrude and retract from the surface of the formwork.

Further, in the tunnel lining formwork device of the present invention, it is preferable that the swing center axis is disposed at the center of the swing panel to support the swing panel.

Further, in the formwork device for tunnel lining according to the present invention, the swing center axis may be disposed at a position deviated to one side from the center of the swing panel to support the swing panel.

Further, in the formwork device for tunnel lining according to the present invention, the reciprocating drive mechanism may be provided with a speed control mechanism for making the driving speed of the swing panel different between forward and backward during reciprocating operation. it can.

[0015]

According to the tunnel lining formwork device of the present invention, the swing panel as a movable plate disposed on the same plane as the surface of the tunnel lining formwork has the pivot center axis as a base point. Since both sides of the oscillating panel alternately protrude or sink into and out of the formwork surface, when one side presses the concrete, the other side always acts to draw in the concrete. In this way, a relief area for the concrete is secured, and the generation of negative pressure in the concrete is avoided as much as possible to promote the fluidization of the concrete.

Further, if the swing center axis is arranged at the center of the swing panel, the area on the side where concrete is pressed and the area on the side where concrete is drawn in become substantially equal, so that the concrete can be fluidized. Further promote.

Further, if the swing center axis is arranged at a predetermined position deviated to one side from the center of the swing panel, the area on the side where the concrete is pressed according to the difference in properties such as viscosity depending on the type of concrete. And the area of the side where the concrete is drawn in can be arbitrarily adjusted, thereby making it possible to promote fluidization according to the type of concrete.

Further, the reciprocating drive mechanism for driving the oscillating panel forward and backward may be provided with a speed control mechanism for making the driving speed of the oscillating panel different between forward and backward when reciprocating. The fluidization of the concrete can be promoted according to the difference in properties such as viscosity due to the fluidization.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the accompanying drawings. In this embodiment, the formwork device for tunnel lining according to the present invention is employed as an example in a shield tunnel by a cast-in-place lining shield method.
That is, according to the cast-in-place lining shield method, as shown in FIGS. 4A to 4C, a mold frame 12 for lining concrete is formed in a cylindrical shape inside the skin plate 3 at the rear of the shield machine 1. And laying concrete lining C into the concrete laying space between the formwork 12 and the inner wall surface of the tunnel for each span of each formwork 12, and laying the lining concrete C through the press ring 5. The tunnel is pressed by the jack 4 and the excavation work is performed while obtaining the support reaction force of the shield excavator 1 by the reaction force, thereby constructing the shield tunnel while forming the lining of the tunnel by the cast-in-place concrete. Things.

The formwork device 2 for tunnel lining according to this embodiment is used as the formwork 12 for lining concrete. That is, the lining form device 2 of this embodiment is arranged along the inner peripheral surface of the skin plate 3 at the rear part of the shield machine 1 and the gap between the inner surface of the skin plate 3 and the thickness of the lining concrete C therebetween. It is assembled in a cylindrical shape by being placed and connected continuously as a plurality of arc-shaped mold pieces divided in the circumferential direction. As shown in FIGS. 1 (a) to 1 (c), which are partial cross-sectional views, this lining form device 2 has a certain amount of lining concrete C cast in a concrete placing space one span before. After the solidification, the expansion jack 4 is contracted to draw the press ring 5, and the spanning formwork apparatus 2 is newly provided between the drawn press ring 5 and the solidified end face of the lining concrete C one span before. Is assembled, and lining concrete C is cast through the concrete casting pipe 9 into the concrete casting space formed thereby.

The lining form device 2 of this embodiment is
Formwork body 6 forming inner casting surface of lining concrete C
And a swing panel 7 arranged on the same plane as the surface 6 ′ of the form body 6, and fixed inside the tunnel via a bracket member extending from the form body 6, and the swing panel 7. And a hydraulic cylinder 8 as a reciprocating drive mechanism connected to the control unit. In addition, in the figure, the swing panel 7
Although only one hydraulic cylinder 8 is illustrated with respect to the single-span lining form device 2, a plurality of hydraulic cylinders 8 may be arranged at appropriate intervals along the peripheral surface of the form body 6.
By assembling the lining form device 2 in a plurality of circumferential directions, a plurality or a large number of swing panels 7 and hydraulic cylinders 8 are arranged around a cylindrical form for one span. .

Here, the swing panel 7 closes the substantially rectangular opening 10 formed in the mold body 6, and the opening 1
0 is oscillated about the center part of the center axis 7a fixed at both ends across the substantially center of the center axis 0 so that both sides of the center axis 7a are alternately arranged on the surface 6 'of the form body 6 alternately. Protrudes and sinks. The peripheral edge of the swing panel 7 and the inner edge of the opening 10 protrude inward from the tunnel and slide along each other in a shape along the swing curved surface at the outer end of the swing panel 7. Flange part 7 that fits freely
b and 6b are provided so that no gap is formed in the opening 10 when each side of the swing panel 7 projects and sinks into the surface 6 'of the form body 6. .

The tip of the piston rod 8a of the hydraulic cylinder 8 is pin-coupled to the back surface of one side of the swing panel 7, and the hydraulic cylinder 8 moves in accordance with the reciprocating operation of the piston rod 8a.
As shown in FIGS. 1B and 1C, the swing panel 7 swings, and both sides thereof are alternately projected and immersed in the surface 6 ′ of the form body 6.

After assembling the formwork apparatus 2 having the above structure on the inner periphery of the skin plate 3, it is sandwiched between the form body 6 and the skin plate 3 or the ground on the outer periphery through the concrete casting pipe 9. The lining concrete C is cast in the concrete casting space. Then, when the lining concrete C is filled up to the location of each swing panel 7 provided around the cylindrical formwork, each hydraulic cylinder 8
Is driven to reciprocate the piston rod 8a, the laid concrete C is pressed on the projecting side of the swing panel 7 as shown by arrows in FIGS. 1 (b) and 1 (c). At the same time, a negative pressure is sucked on the immersion side, and the lining concrete C around the oscillating panel 7 is efficiently disturbed and fluidized by the synergistic action, whereby the concrete is firmly compacted. Become. The speed of the reciprocating operation is preferably set to about 5 to 10 times / minute as a standard in order to prevent concrete separation.

When the compaction operation is completed, the operation shown in FIG.
As shown in (a), the swing panel 7 is attached to the surface 6 ′ of the formwork 6.
By returning to the same plane as above, it is possible to prevent unevenness from being generated on the surface of the lining concrete C after demolding.

The compacting operation is performed as shown in FIG.
As shown in (c), after filling the lining concrete C, the telescopic jack 4 is extended, and the excavating work by the shield excavating machine 1 performed while pressing the lining concrete C can be performed. When the excavation work for one stroke of the telescopic jack 4 is completed, as shown in FIG. 2, the telescopic jack 4 is in an extended state.
Is contracted, the press ring 5 is drawn, and the lining form device 2 of the next span is further assembled behind it.

In the above embodiment, the swing panel 7
Is swingably supported at the center of the swing panel 7 with a swing center axis 7a fixed at both ends crossing substantially the center of the opening 10 as the base point. ),
As shown in (b), the swing panel 7 can be supported by being arranged at a position deviated to one side from the center of the swing panel.

In other words, when the swing center shaft 7a is arranged in this manner, the two sides of the swing panel 7 sandwiching the same correspond to differences in properties such as viscosity depending on the type of the lining concrete C to be cast. By adjusting the ratio of the lengths L1 and L2 and the area ratio associated therewith, fluidization of the lining concrete C can be promoted.

In each of the above embodiments, the hydraulic cylinder 8 is connected to a speed control mechanism capable of adjusting the expansion and contraction speed of the hydraulic cylinder 8 so that the extruding speed and the suction speed of the swing panel 7 can be adjusted to adjust the type of concrete. The fluidization of the concrete can be promoted in response to the difference in properties such as viscosity due to the above.

Further, in the above embodiment, the swing center axis 7a of the swing panel 7 is provided in the direction perpendicular to the axial direction of the tunnel,
Although the swing panel 7 is made to swing in the axial direction of the tunnel, the swing center axis 7a is attached in the axial direction of the tunnel, and the swing panel 7 is made to swing in the direction intersecting with the axial direction of the tunnel. Can also.

In the above embodiment, the case where the formwork apparatus for tunnel lining according to the present invention is employed as the formwork for lining concrete in the cast-in-place lining shield method, but the present invention is not limited to this. Rather than being done, other tunnel excavators such as shield excavators and tunnel boring machines, and tunnels excavated and formed by various tunnel excavators, and lining concrete forms for all tunnels such as mountain tunnels have the above configuration. The swing panel and the reciprocating drive mechanism can be attached to use as the formwork device for tunnel lining of the present invention.

[0032]

As described in detail above, the tunnel lining formwork device according to the present invention is provided on the same side as the surface of the tunnel lining formwork. Is provided with a swinging panel that alternately protrudes and sinks into the formwork surface, and a reciprocating drive mechanism that swings the swinging panel, so that one side of the swinging center axis presses the concrete. When doing so, the other side always acts to draw in the concrete, thereby ensuring a place for concrete to escape and minimizing negative pressure in the concrete as much as possible to facilitate concrete fluidization. Facilitate. Accordingly, the poured concrete for lining can be compacted more densely, and high quality concrete for lining can be easily cast and formed.

Further, if the swing center axis is arranged at the center of the swing panel, the area of the concrete pressing side and the area of the concrete drawing side are substantially equal, so that the concrete can be fluidized. Can be further promoted.

Further, if the swing center axis is arranged at a predetermined position deviated to one side from the center of the swing panel, the area on the side for pressing the concrete according to the difference in properties such as viscosity depending on the type of concrete. And the area of the side where the concrete is drawn in can be arbitrarily adjusted, thereby making it possible to promote fluidization according to the type of concrete.

Further, the reciprocating drive mechanism for driving the oscillating panel forward and backward may be provided with a speed control mechanism for varying the driving speed of the oscillating panel between forward and backward movements. The fluidization of the concrete can be promoted according to the difference in properties such as viscosity due to the fluidization.

[Brief description of the drawings]

FIGS. 1A to 1C are partial cross-sectional views showing an example of a situation in which lining concrete of a shield tunnel is formed using a tunnel lining form device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a state where compaction work using a tunnel lining form device according to one embodiment of the present invention has been completed.

FIGS. 3A and 3B are explanatory views showing another embodiment of the swing panel.

4 (a) to 4 (c) are schematic views illustrating a cast-in-place lining shield method using a tunnel lining form device according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield excavator 2 Tunnel lining formwork device 6 Formwork body 7 Swing panel 7a Swing center shaft 8 Reciprocating drive mechanism (hydraulic cylinder)

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kenjiro Fujita 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Yoshio Saga 209 Ogibu, Takaoka-shi, Toyama In-house (56) References JP-A-7-48994 (JP, A) JP-A-2-171494 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 11/10

Claims (4)

(57) [Claims] 1. A swing panel disposed on the same plane as a surface of a tunnel lining formwork, and having both sides alternately protruding and retracting from the formwork surface with respect to a swing center axis, and the swinging form. A formwork device for tunnel lining comprising a reciprocating drive mechanism for swinging a panel. 2. The tunnel lining formwork device according to claim 1, wherein the swing center axis is arranged at the center of the swing panel to support the swing panel. 3. The tunnel lining form according to claim 1, wherein the swing center axis is disposed at a position deviated to one side from the center of the swing panel to support the swing panel. apparatus. 4. The reciprocating drive mechanism according to claim 1, wherein said reciprocating drive mechanism has a speed control mechanism for varying a driving speed of said swing panel during reciprocating operation between forward and backward. Formwork equipment for tunnel lining.