JPS63197800A - Inner formwork overhauling device in method of non-segment-shield construction - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 is a tunnel construction method that uses equipment that forms a shell against the ground and protects the excavation work space from soil pressure and underground water pressure.The conventional shield method is as follows. something is known.

First, a starting shaft will be dug to transport the shield machine, excavated soil, materials, etc. Next, from this shaft, a shield machine equipped with a cutter is pushed into the tip of the cylindrical frame of the steel source, and the shield machine is propelled while excavating other mountains with the cutter, lining the hole that was excavated at the rear. Create a tunnel as you go. There are two types of lining: primary lining using segments and secondary lining using concrete lining.
Next, lining is performed by assembling the segments, which are divided into circular arcs 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 the earth and water pressure around the tunnel, and in the short term, it must have enough strength to withstand the large jacking thrust of the shield machine.

Once all the segments have been assembled in the drilled hole,
Assemble the sujiru foam to form a cylindrical gap inside it (disassemble it after the concrete has hardened), then pour concrete into that gap and let it harden to create a concrete lining, that is, a secondary lining. I do. 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 to bear 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. Because it is a manufactured item, it is expensive, and it has to be buried, which causes an increase in costs.A secondary concrete lining is required to stop water and finish, which takes a long time. Disadvantages include the need for a steel form for concrete lining, which is a cause of cost increase, and the assembly and dismantling work complicates the process and causes delays in the construction period. It had a

Therefore, in order to eliminate these drawbacks, the applicant first proposed the "Non-segment shield method" (patent application filed in 1986-
No. 295378). This construction method involves assembling an inner formwork and an outer formwork, which are divided into a plurality of parts and each having a predetermined width, into a cylindrical shape along the wall of a hole dug by a shielding machine, and then integrating them with connecting members. After a predetermined number of outer forms are installed in a row along the excavation direction of the hole, concrete is poured between the inner form and the outer form and a concrete lining is applied, and the part where this concrete lining has hardened. When the concrete lining reaches a predetermined length, the rear inner formwork installed continuously inside this concrete lining is separated from the outer formwork and dismantled, and then the inner formwork is assembled on the newly excavated wall surface. It is used to construct tunnels underground by reusing it as formwork.

[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. It became necessary to dismantle the inner formwork.

However, in the conventional shield construction method, the 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 equipment was required for dismantling the

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 has been made in view of the above circumstances, and is a non-segment shield that can safely and efficiently dismantle the inner formwork in the non-segment shield construction method and can save labor. The purpose of this invention is to provide an internal formwork dismantling device for construction methods.

"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 formwork 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 FIGS. 1 and 2, the symbol G indicates the ground near where the tunnel will be constructed, and the symbol l indicates the cast-in-place concrete lined on the wall of the excavation hole by the non-segment shield construction method. FIG. 1 shows the inner formwork 2 used to form the cast-in-place concrete 1 being dismantled using the inner formwork dismantling bag @3 according to the present invention. The tunnel is built horizontally 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, an outer formwork is being applied to the wall of the hole excavated by the shield machine. (not shown) and the inner formwork 2 are assembled into a cylindrical shape along the wall surface of the excavation hole, and concrete is placed in the void of the double formwork. After the cast-in-place concrete 1 has hardened, the inner formwork 2 is removed. At this time, the outer formwork (not shown) is buried in cast-in-place concrete l.

The inner formwork dismantling device 3 is installed in a part where the inner formwork 2 has already been removed and the cast-in-place concrete l has been exposed. The 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 is rigidly constructed by the frame 4a. An erector ring 5 is provided at the front end of the cylindrical main body frame 4 to support a dismantling erector 6, which will be described later. The erector ring 5 is a turning gear 2 that spans its entire circumference! , supported by the ring receiving roller 20 and the turning gear 2! The pinion 22 (see FIG. 3) meshing with the main body frame 4 allows the main body frame 4 to rotate around the axial center of the main body frame 4. The pinion 22 is driven by a hydraulic motor 31.

A demolition erector 6 is installed on the curved surface of the erector ring 5. The demolition erector 6 is attached to the erector ring 5 by a support part 23, and has a grip part 25 at its 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-rear direction (the length direction of the tunnel) by a chuck slide mechanism 27 provided in the gripping part. ing.

The main body frame 4 has a radial direction of the main body frame,
In other words, a plurality of fixed jacks 7 are provided that extend substantially perpendicularly toward the tunnel wall.

The fixing jack 7 is used to fix the internal formwork dismantling device 3 so that it does not move when it is operated.

A presser plate 30 is provided at the tip of the rod 29 of the fixed jack 7, as shown in FIG.

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 serving 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 cast-in-place concrete as in the embodiment, or they may be constructed by laying rails (not shown) in an already completed part of the tunnel. It may also be one that can run on rails.

Next, the operation of the inner formwork dismantling device 3 configured as described above will be explained.

Using the above-mentioned inner formwork dismantling device 3, non-segment
The inner formwork 2 used in the shield construction method can be dismantled as follows.

First, the inner formwork dismantling R3 is carried out 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, the part of the cast-in-place concrete l where the inner formwork dismantling g13 is now installed is also the part from which the inner formwork 2 was removed by this dismantling device 3 just before that, so it is actually In this case, the inner formwork dismantled 1i113 may be moved slightly (by the width of one inner formwork 2) in the forward direction of the tunnel. This movement can be performed smoothly using the wheels 8.

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. The rod 29 extends toward the outside of the main body frame 4, and the presser plate 30 presses against the tunnel wall surface to fix the demolition device 3.

Next, the hydraulic motor 3! is driven to rotate the erector ring 5, position the grip part 25 of the erector 6 for dismantling at the inner form 2 to be dismantled, and attach the erector 6 to the chuck plate (not shown) of the inner form 2. chuck 2
6 is fitted. 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, since the chuck 26 can correct for-and-aft deviations by the chuck slide mechanism 27, the work can be done reliably and smoothly. However, since the inner formwork 2 is connected to the outer formwork (not shown) by connecting members (bolts), the bolts are removed before that.

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 l. 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 shield machine and used as an inner formwork. Ru.

In this way, according to the above-mentioned inner formwork dismantling device 3, non-
This method not only saves labor in dismantling the inner formwork in the segment shield construction method, but also allows the work to be carried out safely and efficiently. Moreover, it is completely independent from the shielding machine or formwork assembly device, and is movable on wheels 8, so it can be used for example when casting concrete l
It can be used according to the construction situation of the tunnel, such as changing the curing period. 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 non-segment
An inner formwork dismantling device in the shield construction method includes a main body frame, a demolition erector rotatably attached to the main body frame, a fixing means for fixing the main body frame to a tunnel wall surface, and a movable member for fixing the main body frame to a tunnel wall surface. In addition, the demolition erector is equipped with a gripping part that grips the inner formwork, and an arm that allows the gripping part to move freely in the radial direction of the tunnel. It is possible to save labor in dismantling the inner formwork in the segment shield construction method, and to make it safe and efficient. 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]

Figures 1 to 4 show embodiments of the present invention. Figure 1 is a side view showing the inner formwork dismantling device in the non-segment shield construction method according to the present invention together with a tunnel, and Figure 2 is a side view showing the same. A front view of the inner formwork dismantling device, FIG. 3 is an enlarged view of a part of the inner formwork dismantling device, and a side view showing the area around the pinion 22, and FIG. 4 similarly shows the area around the fixed jack 7. FIG. l...Cast-in-place concrete, 2...
...Inner formwork, 3...Inner formwork dismantling device, 4...
...Body frame, 6...Erector for dismantling, 7...Fixing jack (fixing means), 8
...Wheel (transportation means), 24...Arm, 25...Grip portion.

Claims (1)

[Claims] An inner mold for separating and dismantling the inner formwork from the outer formwork after the concrete has hardened between the inner formwork and the outer formwork, each assembled into a cylindrical shape at the rear of the shield machine that excavates. A frame dismantling device, comprising: a main body frame; a dismantling erector rotatably attached to the main body frame;
The demolition erector includes a fixing means for fixing the main body frame to a tunnel wall surface and a moving means for making the main body frame movable; An internal formwork dismantling device for a non-segment shield construction method, characterized in that it has an arm that is movable in the radial direction.