JPH059600B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an inner formwork dismantling apparatus suitable for use in a non-segment shield construction method.

``Conventional technology'' In general, the shield method in tunnel construction works as a shell against the ground, reducing the earth pressure and reducing the excavation work space.
This is a tunnel construction method that uses equipment to protect from underground water pressure, and the following conventional shield construction methods are known.

First, a starting shaft will be dug to transport the shield machine, excavated soil, materials, etc. Next, from this stand,
A shield machine equipped with a cutter is pushed into the tip of a steel cylindrical frame, and the shield machine is propelled while excavating the ground with the cutter, creating a tunnel while lining the hole that is excavated at the rear. go. There are two types of lining: primary lining using segments and secondary lining using concrete lining.
The primary lining is performed by assembling the segments, which are divided into arcuate shapes of a predetermined width, into a ring shape along the wall surface of the excavated hole using an erector installed at the rear of the shielding machine. In the long term, this segment must bear the loads of earth pressure, water pressure, etc. around the tunnel, and in the short term, it must have the strength to withstand the large jacking thrust of the shield machine.

Once all the segments have been assembled in the excavated hole, a steel form is assembled to form a cylindrical gap inside it (dismantled after the concrete has hardened), and then concrete is poured between the holes. By curing it, concrete lining, or secondary lining, is performed. The secondary lining serves as a water stopper and an external finishing touch.

However, in the conventional shield construction method described above, the segments are designed and manufactured to handle long-term loads such as soil water pressure and the jerking thrust of the shield machine, and to satisfy various conditions for having a permanent lining structure. Therefore, it becomes expensive,
Moreover, it has to be buried, which causes an increase in costs, and secondary lining of the concrete lining is required to stop water and finish, which causes a longer construction period. The steel frame is required, which is a cause of increased costs, and the assembly and disassembly work complicates the process, causing a delay in the construction period.

Therefore, in order to eliminate these drawbacks, the applicant first developed the "Non-segment shield method".
(Japanese Patent Application No. 60-295378 [Japanese Unexamined Patent Publication No. 62-153498]). This publication discloses that along the wall of a hole dug by a shielding machine, an inner wall frame and an outer frame that are divided into a plurality of parts and each having a predetermined width are assembled into a cylindrical shape while being integrated with a connecting member.・After a predetermined number of outer formworks are installed in a row along the excavation direction of the hole, concrete is poured between the inner formwork and outer formwork to provide a concrete lining, and this concrete lining is solidified. When the section reaches a predetermined length, the rear inner formwork of the inner formwork installed continuously inside this concrete lining is separated from the outer formwork and dismantled, and then the newly excavated wall is This is used to construct underground tunnels by reusing it as the inner formwork for assembly.

"Problems to be Solved by the Invention" By the way, in the non-segment shield construction method, the inner formwork is used as a formwork to be assembled on the wall of a newly excavated hole, so the area where the concrete lining has been completed is It became necessary to dismantle the inner formwork.

However, in the conventional shield construction method, segments are assembled using an erector fixed to the rear of the shield machine, and the assembled segments are permanently buried in the tunnel as lining material. No special dismantling equipment was required. In addition, if it becomes necessary to dismantle a segment, workers will erect scaffolding inside the cylindrical segment.
The method used was to remove the connecting bolts of the segments and lift them down one by one using a crane or chain block. This work requires a great deal of labor as it requires work in a confined space, and is also extremely dangerous.

The present invention was made in view of the above circumstances, and
The purpose of the present invention is to provide an inner formwork dismantling device for the non-segment shield construction method, which can safely and efficiently dismantle the inner formwork in the non-segment shield construction method, and can save labor. It is something to do.

"Means for Solving the Problems" The inner formwork dismantling device for the non-segment shield construction method according to the present invention includes a main body frame, a dismantling erector rotatably attached to the main body frame, The demolition erector includes a fixing means for fixing the frame to the tunnel wall surface and a moving means for making the main body frame movable, and the demolition erector includes a gripping part for gripping the inner formwork and a gripping part for holding the inner formwork in the radial direction of the tunnel. It has an arm that is freely movable.

"Operation" In order to dismantle the inner formwork of a tunnel using the non-segment shield construction method, the inner formwork dismantling device according to the present invention is moved to the place where the inner formwork in the tunnel is to be dismantled, that is, the inner formwork has already been dismantled. After being moved and installed at the forefront of the demolished part where cast-in-place concrete is exposed, it is fixed to the tunnel wall using a fixing means, and then the demolition erector is rotated to place the cast-in-place concrete at the forefront of the area to be demolished. The gripping section is positioned at the mold, the arm is extended and the inner mold is gripped by the gripping section, and then the arm is contracted. Once one row of inner formwork has been removed (dismantled), the inner mold dismantling device is moved forward by the moving means and installed at the required position again.

"Embodiments" Examples of the present invention will be described below with reference to FIGS. 1 to 4. In Figures 1 and 2, the symbol G indicates the ground near where the tunnel will be constructed;
Reference numeral 1 indicates cast-in-place concrete lined on the wall of the excavated hole using the non-segment shield method. FIG. 1 shows the inner formwork 2 used to form the cast-in-place concrete 1 being dismantled by the inner formwork dismantling apparatus 3 according to the present invention. The tunnel is constructed towards the left in the figure. That is, on the left side (not shown) in FIG. 1, a shield machine is moving forward while excavating the ground G at its tip, and at the same time, behind it, there is an external mark on the wall of the hole excavated by the shield machine. A double formwork made up of a formwork (not shown) and the inner formwork 2 is assembled into a cylindrical shape along the wall of the excavation hole, and then the inner formwork 2 is assembled into a cylindrical shape. The construction process involves pouring concrete in place and removing the inner formwork 2 after the cast concrete 1 has hardened. At this time, the outer formwork (not shown) is buried in the cast-in-place concrete 1.

The inner formwork dismantling device 3 is installed in the part where the inner formwork 2 has already been removed and the cast-in-place concrete 1 has been exposed. A main body frame 4 constituting the inner formwork dismantling device 3 is formed into a substantially cylindrical shape to match the cross-sectional shape of the excavated hole of the tunnel, and has a rigid structure due to the frame 4a. An erector ring 5 is provided at the front end of the cylindrical frame 4 to support a dismantling erector 6, which will be described later. The erector ring 5 is equipped with a turning gear 21 that extends around its entire circumference, and is supported by a ring receiving roller 20 and has a pinion 22 (third pinion) that meshes with the turning gear 21.
(see figure), it is rotatable relative to the main body frame 4 with the axial center of the main body frame 4 as the rotation center. The pinion 22 is driven by a hydraulic motor 31.

On the front of the erector ring 5 is the erector 6 for disassembly.
will be equipped. The dismantling erector 6 has a support part 23
The erector ring 5 is attached to the erector ring 5, and a grip portion 25 is provided at the tip via an arm 24 extending in the radial direction of the excavated hole. The arm 24 is attached to the support section 23 via an erector cylinder 28, and is movable in the radial direction of the tunnel by this erector cylinder 28. The gripping part 25 is equipped with a chuck 26 that directly grips the inner formwork 2, and the chuck 26 can be slightly moved in the front-back direction (the length direction of the tunnel) by a chuck slide mechanism 27 provided in the gripping part. It's summery.

The main body frame 4 is provided with a plurality of fixing jacks 7 extending in the radial direction of the main body frame, that is, substantially perpendicularly toward the wall surface of the tunnel. The fixing jack 7 is used to fix the internal mold disassembly device 3 so that it does not move when it is operated. At the tip of the rod 29 of the fixed jack 7,
As shown in FIG. 4, a presser plate 30 is provided. The outer surface of the holding plate 30 is formed into a curved surface so that it can easily come into surface contact with the inner wall surface of the tunnel.

Further, the main body frame 4 is provided with wheels 8 as moving means at its lower part, and is movable in the tunnel in its length direction. The wheels 8 may be so-called tire-shaped wheels that can run directly on the cast-in-place concrete 1 as in the embodiment, or rails (not shown) may be laid in an already completed part of the tunnel. It may also be one that can run on rails.

Next, the inner formwork dismantling device 3 configured as described above is
The effect of this will be explained.

The inner formwork 2 used at the rear of the non-segment shield can be dismantled using the inner formwork dismantling device 3 in the following manner.

First, the inner formwork dismantling device 3 is installed at a location in the tunnel where the inner formwork 2 is to be dismantled, that is, as shown in FIG. 1, the inner formwork 2 has already been dismantled and the cast-in-place concrete 1 is exposed. A dismantling erector 6 is installed at the frontmost part of the part (corresponding to the rearmost part of the inner formwork 2) so as to face the direction in which the inner formwork 2 is assembled.
However, since the part of the cast-in-place concrete 1 where the inner formwork dismantling device 3 is now installed is also the part from which the inner formwork 2 was removed by this dismantling device 3 immediately before, it is actually Inner formwork dismantling device 3
It is sufficient to move it slightly (by the width of one inner formwork 2) in the forward direction of the tunnel. This movement is
The wheels 8 allow for smooth operation.

Once the inner formwork dismantling device 3 is installed at a predetermined position, the fixing jack 7 is activated so that the device does not move during the inner formwork dismantling. rod 2
9 extends toward the outside of the main body frame 4, and the presser plate 30 presses against the tunnel wall surface to remove the demolition device 3.
to be fixed.

Next, the hydraulic motor 31 is driven to rotate the erector ring 5, the grip part 25 of the dismantling erector 6 is positioned at the inner form 2 to be dismantled, and the chuck plate of the inner form 2 (not shown) is positioned at the inner form 2 to be dismantled. (1) Fit the chuck 26 of the erector 6 for disassembly.
At this time, the approach distance of the gripping portion 25 to the inner mold frame 2 is adjusted by extending and contracting the erector arm 24 using the erector cylinder 28. In addition, the chuck 26 is operated by a chuck slide mechanism 27.
The work can be done reliably and smoothly since it can correct for deviations in the front and rear directions. However, inner formwork 2
Connecting members (bolts) to the outer formwork are omitted from illustration.
Since the bolts are connected by , remove the bolts before doing so.

Once the inner formwork 2 and the chuck 26 are fitted, the erector cylinder 28 is operated in this state to retract the arm 24. As a result, the inner formwork 2 is removed from the cast-in-place concrete 1. The removed inner formwork 2 is transported to a predetermined position by the operation of the erector ring 5 and the erector cylinder 28, and then assembled on the wall of a newly excavated hole by a shielding machine to form the inner mold. Repurposed as a frame.

In this way, according to the above-mentioned inner formwork dismantling device 3, it is possible to save labor in dismantling the inner formwork in the non-segment shield construction method, and also to perform the work safely and efficiently. . Moreover, since it is completely independent from the shielding machine or formwork assembly equipment and is movable on wheels 8, it can be adjusted to suit the construction situation of the tunnel, such as changes in the hardening period of cast-in-place concrete 1. Other uses are possible. Further, by appropriately selecting the strokes of the fixing jack 7 and the erector cylinder 28, which are the fixing means of this device, it is also possible to apply it to other non-segment shield tunnels.

"Effects of the Invention" As explained above, the inner formwork dismantling device for the non-segment shield construction method according to the present invention includes a main body frame, a dismantling erector rotatably attached to the main body frame, The demolition erector is equipped with a fixing means for fixing the frame to the tunnel wall surface, and a moving means for making the main body frame movable, and furthermore, the demolition erector has a gripping part for gripping the inner formwork, and a gripping part for holding the inner formwork at a radius of the tunnel. Since it has an arm that can be moved freely in the direction, it saves labor when dismantling the inner formwork in the non-segment shield construction method, and makes it safe and efficient. be able to. Furthermore, the inner formwork dismantling device according to the present invention is completely independent from the shielding machine or the formwork assembly device, and is movable on wheels, so it is independent of the tunnel construction status and process progress. It is possible to use it accordingly. In addition, by appropriately selecting the fixing jack, which is the fixing means of this device, and the stroke of the erector cylinder, this device can be used for other non-segment shield tunnels, and other excellent effects are achieved.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention, and FIG. 1 shows a non-segment
A side view showing the inner formwork dismantling equipment used in the shield method along with the tunnel, Figure 2 is a front view of the inner formwork dismantling equipment, and Figure 3 is an enlarged view of a part of the inner formwork dismantling equipment, showing the pinion. 22, and FIG. 4 is a side view showing the vicinity of the fixed jack 7. 1... Cast-in-place concrete, 2... Inner formwork,
3...Inner formwork dismantling device, 4...Main frame, 6
...Erector for dismantling, 7...Fixing jack (fixing means), 8...Wheel (moving means), 24...Arm, 25...Gripping portion.

Claims (1)

[Claims] 1 At the rear of the excavating shield machine, after the concrete poured between the inner formwork and outer formwork, which are assembled in a cylindrical shape, has hardened, the inner formwork is separated and dismantled from the outer formwork. A formwork dismantling device, comprising a main body frame, a demolition erector rotatably attached to the main body frame, and a fixing means for fixing the main body frame to a wall surface of a tunnel.
The demolition erector includes a moving means that allows the main body frame to move freely, and the demolition erector includes a gripping part that grips the inner formwork, and an arm that allows the gripping part to be moved in a radial direction of the tunnel. Internal formwork dismantling equipment for non-segment shield construction method.