JPS61294097A - Method of concrete placing construction in tunnel - 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 a method for placing concrete in a tunnel, and particularly to a method for placing concrete in a bottom floor of a tunnel.

(Prior art) Conventionally, to place concrete on the bottom floor of a tunnel, a concrete placing device was used in which the inverted form and the pier built on it were moved together. Ta.

When moving this concrete placing device, corbels B (Fig. 8) are required on the side walls of tunnel A. For this reason, conventionally, it was necessary to first place a secondary lining of arch concrete (C) from the sides to the ceiling of the tunnel, and then invert concrete (D) to be placed on the bottom floor.

(Problem to be solved by the invention) The conventional method described above had the following problems.

(a) Since the invert concrete 1-D is poured after the arch concrete C is poured, when the invert concrete D is poured, the bottom of the tunnel A is scratched and becomes sludge 17. Therefore, the sludge must be removed before pouring the invert concrete D, which is a difficult task. Also, it was difficult to drain the bottom (mouth) due to spring water coming from the bottom. 1- The support of the soil base is weakened, and the support and strength of the arch supports cannot be expected.

(c) Since the expansion of the loosened region is difficult to be prevented +t-, the 9th stage contraction of the deformity (11!! mountain stabilization) cannot be expected.

(First step to solve the dark problems) The purpose of the present invention is to solve the conventional problems by pouring the invert concrete D for the bottom floor before the arch concrete C for the secondary lining, and to The purpose is to quickly construct a tunnel of excellent quality by simultaneously excavating the tunnel face and bench part 1 and carrying out the pickpocket while pouring invert concrete D.

As shown in FIGS. 1 to 5, the method of the present invention is to apply an ink y<-1-
Form 2 was installed, a pier 3 formed separately from it was erected on the bottom of form 2, and in this state, invert concrete 1-4 was poured on the bottom floor, and in parallel with this pouring. or after that, transport the shear in the tunnel with a transport vehicle running on -1- of pier 3, and then move pier 3 in the direction of progress of the work along the 1 part girder 5 of invert four 1.2. After this, the invert form 2 is transferred in the same direction as the moving direction of the pier 3, and after this transfer, the invert concrete 4 is placed, and thereafter, the face or bench portion l is excavated, the shear is removed, and the pier 3 is moved. , invert form 2
The movement of the invert concrete 4 and the pouring of the invert concrete 4 are repeated.

(Example) In Figs. 1 to 5, 6 is the pier slope, 7 is the front pier main jack, 8 is the rear pier main jack, 9 is the pier moving roller, IO is the self-propelled device, and 11 is the pier main jack. A front main jack for the inverted form, and 12 a rear main jack for the inverted form.

(for production) The construction of the present invention is carried out, for example, in the following order.

(1) Place invert concrete 4 under the invert form 2 under the crosspiece m3.

(2) After placing the invert concrete 4, move the pier 3 as follows.

B. The main jack 7.8 of the pier 3 is retracted to rest the pier moving roller 9 on the L section girder 5 1- of the invert form 2.

Further shorten the main jack 7.8 on pier 3 and let it float.

C. Invert form 2 of pier 3 by self-propelled device 10
Move it forward by the required amount along the 1st part of the digit 5.

2. Set the pier 3 by extending the main jack 7.8 of the pier 3 at the specified position.

E. The pickpocket is carried out from the face or bench f41 by a transport vehicle running on 1- of the pier 3. This rolling out work can also be carried out in parallel with concrete pouring.

(3) Repeat operations I to E above to offset the length required for the next concrete pouring.

(4) Next, move the invert form 2. The movement is performed as follows.

B. Add the front rail 14 in front of the existing rail 13 on the bottom floor.

Mouth, main jack of invert form 2 11.12
Stretch and separate the form 2 from the invert concrete 4 that was placed earlier.

C. The self-propelled device moves the invert form 2 by the length for which the next invert concrete is to be poured.

After completing the knee movement 7', shorten the invert form river main jack 11.12 and set the in/towing form 2.

E. Set the accessories (fund U) for invert form 2.

(5) Place invert concrete 4 under the invert form 2.

The above steps are repeated to continuously cast invert concrete 4 on the bottom floor of the tunnel.

(Effects of the Invention) As described above, the present invention has the following various effects because the invert concrete 4 is cast before the secondary lining arch concrete.

(1) The soil at the bottom of the tunnel does not turn into sludge, so there is no need to remove sludge.

(2) Since water does not spring up from the bottom of the tunnel, the ground is not damaged, and the support and strength of the arch support is ensured.

(3) Expansion of the loose area is prevented to 1, and the ground is stabilized.

(4) Since the invert concrete 4 is placed before the arch concrete, the secondary lining formwork can be moved and set on the hardened invert concrete 4. Therefore, when spraying the invert concrete 4 and the arch, the concrete continues seamlessly at an early stage.

(5) Since the formwork for the final lining can be set up to a position approaching or overlapping the pier 3, the invert concrete 4 and the arch concrete form a ring more quickly.

(6) Since the excavation and scraping of the upper half can be done in parallel using the pier, work efficiency is very high and construction can be carried out quickly and in a short period of time.

(7) The lower half can also be excavated and removed by the backhoe on the upper half, making the work easier.

(8) Since the invert form and the pier are separate bodies, even if the pier is run on a truck or trunk during the pouring or curing of invert concrete and the pickpocket is carried out, the vibrations may be transmitted to the invert form or concrete. Difficult to transmit to inverted concrete. For this reason, even if the shear is removed at the same time as pouring and curing, the inverted concrete remains clean.

[Brief explanation of drawings]

Figures 1 to 5 are detailed explanatory views of the present invention, Figure 6 is an explanatory view of the inverted form front support part and the pier front support part,
FIG. 7 is an explanatory diagram of the inverted form rear support part and the pier rear support part, and FIG. 8 is an explanatory diagram of the conventional construction method. l is bench part 2 is inverted form 3 is pier 4 is inverted concrete 5 is -L part girder

Claims (1)

[Claims] In a concrete casting method for tunnels, in which invert concrete is poured into the bottom floor of the tunnel, and then secondary lining concrete for the arch is poured, after the bottom floor has been excavated, the face or Invert foam was installed on the bottom floor closest to the bench, a pier formed separately from the invert foam was built on top of it, and in this state, concrete was poured on the bottom floor, and in parallel with this pouring. or after that, transport the shear in the tunnel using a transport vehicle running on the pier, then move the pier along the upper girder of the invert form in the direction of work progress, and then move the invert form in the direction of movement of the pier. After this transfer, concrete is placed on the bottom floor, and the process of excavating the tunnel, removing shear, moving the pier, moving the invert form, and placing concrete on the bottom floor is repeated. A concrete pouring method for tunnels, which is characterized by: