JPS58143097A - Construction of case body of precipitatively embedded 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 The present invention relates to a method for integrally constructing an immersed tunnel.

Conventionally, in this type of method, construction is carried out using strong structures such as ventilation towers on both sides of the immersed tunnel line as a reference, and joining the entire immersed tunnel to the same relic.

The main reason why this method is adopted is that the integral joining method uses water pressure by draining the water from the integral joints, so a large reaction force is required when pulling the integral parts together. This is because it is necessary to have a strong structure that absorbs the reaction force of water caused by the flow and waves until it forms and forms.

In this method, the construction of the immersed tunnel cannot be started until after the construction of ventilation towers on both sides of the tunnel route has been completed, which has the disadvantage that the construction period takes a long time.

The present invention has been proposed in order to eliminate such drawbacks.Prior to the integral sinking of an immersed tunnel, an integral support body is constructed at an arbitrary position on the tunnel line, and then an integral support body is constructed on the same support body. This relates to a method for constructing an immersed tunnel in one piece, which is characterized in that one piece is sunk and fixed in a predetermined position, and then the next pieces are sequentially sunk and connected based on the one piece on the support body.

The present invention will be explained below with reference to the illustrated example.

Prior to the sinking of the unit, a groove-shaped cross-sectional support body supported by piles (1) was constructed at appropriate positions on the immersed tunnel line, and a reference unit (3) was placed on the support body (21). The positioning of the same body (3) when sinking is done using the bottom plate (3) of the same body (3).
a) and - version (3b) Vertical jack with VC mounting N field (4
) as well as horizontal jacking (51).

The cylinder (4a) of the vertical jack (4) has a rectangular outer shell in order to reduce surface pressure against horizontal force, and this rectangular cylinder is connected to the support (210 square hole (2a) N
Nice to meet people. Then, when the vertical jack (4) and the horizontal jack (5) are expanded and contracted, the Nit attachment position in the vertical and horizontal directions with respect to the support body 121K of the Iikitai (3) is adjusted. After the positioning of the jack (31) is completed, the gap between the square cylinder of the vertical jack (4) and the square hole (2a) of the support body 121 is filled with mortar. 4) takes advantage of the fact that l1l111 is better than the center hole jack.

Grout injection pipe (
``6:'' is used to inject mortar from the injection pipe (61). In the figure, 171 is a pipe that protrudes from the bottom of the integral body (31) and fits into the large handle on the bottom of the support (2). It has a large size for horizontal resistance.The uplift of the unit (3) is performed by the ballast in the unit (31).

After completing the installation of the standard unit (3) as described above, the units (3') on both sides are constructed, but the joint with the ventilation tower (8) shown in part , in the central part of the integral group other than the closing part, a rubber gasket (91) is provided on the joint end surface of the integral (3') and is pressed against the joint surface of the adjacent integral (3), so that both integral parts are connected. A conventional construction method is adopted in which the water in the joint space formed between the bulkhead and the gasket (91) is drained, and the gasket (91) is watertightly crimped onto the joint surface of the integral part (3) using water pressure. Even if the water in the joint space is removed, mold water pressure equal to the water head difference (H2 - Hl) between adjacent integral bodies +31 (3') is generated, and the horizontal reaction member of the support (2), that is, the pile (ILK) (See Fig. 7) Furthermore, when adjacent integral parts are joined, the water head difference is small, and when there are many joined parts, the water reaction force is dispersed to each supporting body.

In addition, when joining the closing part as shown in part ■ in Figure 5,
As shown in Fig. 6, the integral part (3') is joined underwater by construction of an underwater joint structural member (10, etc.), and construction is carried out so that large hydraulic reaction force does not act on the integral part or the support, which has already been completed KmI.

In the present invention, as described above, an integral support is constructed in advance at an arbitrary position on the line of the immersed tunnel, and by sinking the integral support on the support and fixing it at a predetermined position, a rigid support is placed on the line of the immersed tunnel. A reference unit with a fixed (and positive sKm) is constructed, and subsequent units are sequentially connected using the same unit as a reference.Therefore, according to the present invention, an arbitrary point can be connected using the reference unit as a reference. This makes it possible to submerge the immersed tunnel in one piece, and as a result, when the tunnel is submerged in one piece, it becomes possible to separate the marine route regulation part, the installation part of the ventilation tower, etc., and complete the construction of the ventilation tower, etc. as in the past. Only then will the construction of the ventilation tower be carried out in parallel with the construction of the ventilation tower (there is no need to start).
This can shorten the overall construction period.

The present invention has been explained above using a real wheel example, but what about the present invention? I
J - It is not limited only to such examples,
Various design modifications may be made without departing from the spirit of the invention.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a state in which the reference unit is immersed in an embodiment of the method for integrally laying an immersed tunnel according to the present invention;
The figure is a front view, 3rd FitJ is an enlarged vertical sectional view showing the positioning part of the reference unit, and 4th figure is the arrow direction N-IV in 3rd figure.
5 is a side view showing a solid line situation of an embodiment of the method of the present invention, FIG. 6 is an enlarged view of part (2) in FIG. 5, and FIG. 7 is a water pressure balance diagram when integrally joined. (])...Pile (2t...Support (3)
...Standards integrated (3') ...Unified agent Patent attorney Shige Okamoto 2 other persons

Claims (1)

[Claims] Prior to the installation of an integral part of an immersed tunnel, an integral support body is constructed at an arbitrary position on the tunnel line, and then the integral support body is sunk on the standard support body and fixed at a predetermined position, and then the integral support body on the said support body is constructed. A method for constructing an immersed tunnel in one piece, which is characterized by sequentially submerging and connecting the next pieces based on the following.