JPH0941891A - Repairing method for existing tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accelerate the work at low cost by removing the wall face of a deteriorated tunnel, arranging bars, using a slide center formwork, applying lining with quick hardening cement mortar, and heating and curing it. SOLUTION: The deteriorated wall face surface layer of a tunnel 1 is scraped off for each fixed distance by a mobile chipping machine 3, the tunnel 1 is washed by high-pressure water, reinforcing bars are arranged, and a slide center 8 having a transparent formwork board is arranged. A grout material 12 of highly fluidic quick hardening cement mortar is injected from the grout injection port 11 of the slide central 8, and it is densely filled with no defect. The injected grout material 12 is heated to accelerate its strengthening, and the mold releasing is accelerated to shorten the cycle time of the process. The modification work can be quickly conducted at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of repairing a structure that has deteriorated or deteriorated in an existing tunnel.

[0002]

A conventional method for rehabilitating an aged existing tunnel is to take a means of disassembling all the deteriorated tunnel skeletons and newly building a similar structural skeleton. Was there. Since this method newly replaces the entire section of the tunnel, there were many problems in terms of not only economic efficiency and construction period but also safety.

Depending on the tunnel, the operation cannot be stopped, or there is the case where construction is required during the thinning period such as a waterway tunnel, and there are cases where construction must be carried out in an extremely short period of time. There was a need for a renovation method with a short construction period.

The present invention has been made in view of the above circumstances. The purpose of this is to propose a method for repairing an existing tunnel that has a short repair period, can be repaired with high reliability without loss, and has high safety during construction.

[0005]

[Means for Solving the Problems] This method for rehabilitating an existing tunnel consists of a shaving step for shaving the concrete wall surface layer of the existing tunnel with a mobile chipping machine, a washing step for spraying high-pressure water for washing, and a reinforcing bar arrangement A process cycle in which the muscle process, the grout injection using the movable slide centle formwork, and the curing process are continuously performed is repeatedly improved in units of a predetermined length section of the tunnel, and a transparent plastic form plate is added to the slide centle formwork. Is used to inject a grout material made of a rapid-hardening cement mortar having high fluidity, and heat and cure the injected grout material in the mold to accelerate hardening.

[0006]

The present invention is constructed as described above and has the following effects.

[0007] A process cycle of continuously performing a scraping process, a cleaning process, a reinforcing bar process, a grout injection, and a curing process of the surface layer of an existing tunnel wall surface is continuously mechanized by using a mobile chiseling machine and a slide center frame. , Tunnel length of 1.5m-4.5m is repeated as a unit section,
By proceeding with the renovation, the construction efficiency can be greatly improved.

Since the grout columns of the rapid-hardening cement mortar with high fluidity are injected, it is possible to perform dense and defect-free filling, and by further heating the injected grout material,
Strength can be expressed early, demolding can be accelerated, and process cycle time can be shortened.

By using the transparent plastic form plate, it is possible to visually confirm the filling degree of the grout material during construction, and it is possible to form a dense and smooth wall surface without defects. By assembling the slide center formwork by connecting formwork units having a length of about 1.5 m, it is possible to form a formwork surface that can correspond to the gently curved surface of the tunnel.

Since only the surface layer of the aged tunnel wall surface is repaired, collapse accidents can be prevented and the safety is high.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The tunnel targeted by the repairing method of the present invention may have any shape such as a horseshoe shape, a circular shape, an elliptical shape or the like.
An example of the most common horseshoe-shaped tunnel will be described with reference to the drawings.

In FIG. 1, the wall surface portion of the rolled concrete 2 of the tunnel 1 is moved along a wall surface by a cutting hammer (Spiky hammer) at the end of an arm of a mobile concrete chipping machine 3 mounted on a traveling work carriage. Shave off about 3 cm thick. The thickness to be shaved is set by investigating the roll thickness of the rolled concrete 2 in advance using a rock drilling machine, a boring machine, etc., and based on the roll thickness. The tunnel unit length to be scraped in one scraping step is a length corresponding to the unit length of the grout injection in the subsequent step, that is, the length of the slide centle frame described later.

The chipped debris 5 from which the wall surface has been shaved is carried out of the tunnel by the battery car 6.

The scraped wall surface is cleaned by injecting high-pressure water (maximum pressure 210 kg / cm ² ) from a high-pressure water (maximum pressure 210 kg / cm ² ) injection device attached to the chipping machine 3 (not shown), and taking a predetermined length section as a unit. The scraping process and the cleaning process are completed. Subsequently, a welded wire net 7 serving as a reinforcing bar is arranged on the wall surface cut in the next step.

The next grout material injection and curing step is performed by arranging a slide center frame 8 running on the rail at the position where the welding wire net 7 is laid. As shown in FIG. 2, the slide center formwork 8 includes a transparent formwork plate 9 made of polycarbonate resin facing the wall surface of the rolled concrete 2,
An adjustment jack 10 for adjusting the diameter expansion or contraction of the mold frame plate 9 is attached inside thereof, and a grout injection port 11 is provided at the upper and side positions of the mold frame plate 9.

The mold plate 9 of the slide center frame 8 is adjusted to a position where a predetermined interval is maintained on the scraped wall surface, and the grout material 12 is injected from the injection port 11. The grout material 12 is pasted and filled into the preceding grout hardened body 13 between the form plate 9 and the wall surface.

As the grout material, a quick-hardening cement hardening material shown in Table 1 is used, and a quick-hardening mortar having a high fluidity with a water cement ratio of about 35 to 38% is used. In Fig. 1, grout material is mixed with a grout mixer pump wheel 14 that moves on a rail, and the grout material is mixed at a pressure of 1.5 kg / cm ² or less to a thickness of 3 to 7
cm and no pouring, filling.

The periphery of the mold 8 into which the grout material was injected was covered with sheets, and the injected grout material was heated and cured to develop early strength. Grout material has a compressive strength of 50 kgf / cm ² or more after heating and curing for about 1 hour. Adjustment jack 1
0 could be loosened and demolded, and the grout injection and curing steps were completed.

Incidentally, In FIG. 1, a grate rubber packing is attached between the front end of the form frame plate 9 (the right side of the form frame 8 in the drawing) and the wall surface, and a rubber packing is attached to the lower end of the form frame plate 9 instead of the grate stopper to grout. Prevented material leakage. Also,
In FIG. 1, 15 is a submersible pump for drainage, 16 is an illuminating lamp, and 17 is underground electrical equipment.

As a means for heating the grout in the slide center mold, a hot air panel heater, a heating wire or the like can be used, and it can be performed from inside or outside the mold.

This repairing method is based on the above-mentioned scraping step,
The cleaning process, reinforcing bar arrangement process, grout injection, and curing process are continuously performed in a unit of a tunnel length of about 1.5 m to 4.5 m corresponding to the length of the form plate (see FIG. 1). (Indicated by a dotted line), it was possible to carry out construction of 2 cycles or more per day by repeating using a movable chiseling machine and a slide center formwork.

[0022]

[Table 1]

[0023]

The present invention is as described above, and according to this repairing method, the construction period can be greatly shortened, and there can be formed a wall surface having a fine finished surface and a high-strength surface with no defects.

Also, the construction cost is low and the safety during construction is high.

[Brief description of drawings]

FIG. 1 is a tunnel cross-sectional view illustrating a repairing method of an embodiment.

FIG. 2 is a cross-sectional view of the slide center mold portion of FIG.

[Explanation of symbols]

1 ... Tunnel, 2 ... Rolled concrete, 3 ... Concrete chipping machine, 4 ... Cutting hammer, 5 ... Chisel scrap, 6 ... Battery car, 7 ... Welded wire mesh, 8 ... Sliding center formwork , 9 ... form plate, 10 ... adjusting jack, 11 ... grout inlet, 12 ... grout, 1
3 ... Hardened grout, 14 ... Grout mixer / pump car, 15 ... Submersible pump, 16 ... Lighting, 17 ...
…electrical equipment.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junzo Seo 3-22-1 Minamiurawa, Urawa-shi, Saitama (72) Inventor Takashi Suzuki 167-1 Nanazawa, Tsukinoya-cho, Tone-gun, Gunma Prefecture

Claims (1)

[Claims] 1. A shaving process of shaving a concrete wall surface layer of an existing tunnel with a mobile chipping machine, a rinsing process of spraying the shaving surface with high-pressure water for cleaning, a reinforcing bar arranging process, and a mobile slide centr frame. Injecting grout using, the process cycle of continuously performing the curing process, iteratively refurbishing in units of a predetermined length section of the tunnel, and using a transparent plastic form plate for the slide center form,
A method for rehabilitating an existing tunnel characterized by injecting grout material made of a rapid-hardening cement mortar with high fluidity, and heating and curing the injected grout material inside the formwork to accelerate hardening.