JPS59195996A - Tunnel constructing method - 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] [Industrial Application Field] This invention relates to tunnels that cross live wires of railways, roads, etc.
This relates to tunnel construction methods when constructing new underground passages, etc.

[Prior art]

Various methods have been developed for constructing tunnels on live lines. -f: As an example, a construction method was developed in which a steel element with a box-shaped hollow cross section is press-fitted into the ground, and concrete is then filled inside the element to form the main structure. The same content is disclosed in the official bulletin.

By the way, in the above-mentioned construction method, as in the format shown in Fig. 1, when the element t-[touching tunnel lining is used,
As shown in Prisoner 2, both ends of the tunnel were supported by gate structures connected and fixed in a gate shape. In this case, the lower deck element 3 constituting the ceiling is supported at both ends of the tunnel like a single beam. Therefore, the upper deck element 3 had to be a single piece, and at the same time, the gate structure that concentrated the load and transmitted it to the ground had to be huge.

[Purpose of the invention]

The tunnel construction method of the present invention was developed to overcome all the drawbacks of the prior art as described above, and by making it possible to integrate the side walls and the subfloor sheet metal, the entire upper load can be borne by the entire subfloor slab. The overall purpose is to enable the construction of a structurally lean and stable tunnel.

[Structure of the invention]

Figure 6 shows the force that acts on the tunnel when the side wall B of the lining and the 'F floor slab Ct are integrated and fc.The load W from the top advances to the upper floor slab and becomes a concentrated load P on the side wall B. Reportedly. The side wall B supports the side wall H and transmits the load Pk to the lower slab C, which transmits it to the ground, and the ground receives the reaction force R.
will occur. This way, the upper load is not transmitted to the gate structures at both ends of the tunnel, but is transmitted to the ground directly below it, so even if the ground is soft, the load is distributed in a distributed manner. There is no need to provide such. In addition, the length of the tunnel can be increased as long as the load is transmitted to the ground at that point.

From these facts, it is clear that it is advantageous and necessary to integrate the side walls and the sub-slab, but in the conventional construction method using Nilementra, an excavator or conveyor is loaded inside the element, so the element is not hollow. difficult to integrate. Therefore, in this invention, the following construction method was developed.

That is, for the side wall element at the lowest stage, first, the hollow leading element is used to perform excavation propulsion, and then the main element is propelled to replace the leading element.

The permanent element shall be provided with the necessary internal reinforcement and -
The side walls are removable, and after excavating the tunnel section, the reinforcing bars of the lower deck are inserted and fixed into the main elements, and by pouring concrete, the side walls and the lower deck are integrated. do.

In addition, the leading elements will be collected sequentially from the shaft on the reaching side. Further, as reinforcement for the main element, for example, struts erected at predetermined intervals can be considered.

Construction + J＠μ First, as in the conventional case, the bottom slab elements and side wall elements with a box-shaped hollow cross section are propelled and press-fitted into the lining section one after another.As mentioned above, the leading element for the lowest element is propelled, and then the main construction is carried out. Press-fit the element. All parts other than the lowest element will be filled with concrete and light to form a concrete structure, and the interior will be excavated. In addition, the side wall elements are integrated by on-site welding on the inside of the connecting portions, if necessary, to prevent them from expanding inward due to external earth pressure. Next, reinforcement is arranged for the lower deck section, and concrete is poured to form the lower deck integral with the side wall via the main element at the lowest stage of the side wall. The inner side of the main element should be removable by a sliding method or other method, and when press-fitting, that side should also be attached to prevent dirt from entering, and the removal should be done immediately after press-fitting or before inserting reinforcing bars. It would be better if it could be removed for construction.

〔Example〕

The illustrated embodiment will be described below.

FIG. 4 shows an example of the main element 2, in which a strut 2c' made of angle iron is interposed between seven upper and lower flanges 2a to resist vertical forces. Further, among the left and right webs 26, the quench on the inside of the tunnel can be pulled by sliding in the longitudinal direction.

Figures 5 and 6 each show an example of a tunnel constructed by the tunnel construction method of the present invention. and is transmitted to side wall B. In addition, although all of the floor plates are shown as flat ones, arched ones are also acceptable. In the figure, 3 is a lower slab element, 4 is a side wall element, and the above-mentioned main element 2 is installed at the lowest stage of the side wall B.

Concrete 5 is filled in each sub-slab element 3 and side wall element 4, and welds 6 are applied to the inside of the joints of the side wall elements 4 to enhance the integrity of the 9111 wall B. The reinforcing bars 7 of the lower floor slab C are inserted between the struts 2c of the main installation element 2, and the both side walls B and the lower floor slab C are integrated by pouring concrete 8.

FIGS. 7 to 10 show the construction procedure. First, the upper deck element 3 is propelled from the full starting shaft 10 to the reaching shaft 1. There is a cutter at the tip of this sharpening element.
A conveyor such as a screw conveyor is inserted behind the cutter (see Fig. 7). Upper deck upper V
After the construction of the ment 3 is completed, the side wall elements 4 are successively advanced from above (see Fig. 8). To construct the lowest end of the side wall, first, the leading element 1 having a box-shaped hollow cross section is propelled in the same manner as the other elements (see Fig. 9). Next, the main element 2 is connected to the rear of the installed leading element and press-fitted. At this time, the leading element 1 pushed out into the reaching hole is lifted up by a single-member clay 7 or the like and recovered (see FIG. 10). Hereinafter, as mentioned above, pouring of concrete 5, excavation inside the lining, welding between elements,
Through steps such as reinforcing reinforcement and pouring of corrugations 18, etc., a tunnel over live wires as shown in Fig. 5 and 1-1: Fig. 6 is completed.

〔Effect of the invention〕

For the side wall element at the lowest stage, the leading element is first press-fitted during excavation, and then the main element is press-fitted.
It is possible to construct a permanent element with a complex internal structure, and as a result, the reinforcement of the lower deck slab can be completely continuous within the main element with an open side, and a tunnel can be formed in which the side wall and the F deck are integrated. Therefore, the drawbacks of conventional tunnels using tunnels are eliminated, and long tunnels can be constructed inexpensively and safely without special foundation work.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a tunnel constructed by the conventional construction method, Fig. 2 is a perspective view of its lining, and Fig. 3 is a longitudinal cross-sectional view showing the forces acting on the tunnel constructed by the construction method of the present invention.
Fig. 4 is a perspective view of the lowest side wall element, Fig. 5 is a vertical cross-sectional view showing an example of a tunnel to be constructed, Fig. 6 is a longitudinal cross-sectional view showing another example, @ Fig. 7 to Fig. 10 line FIG. 3 is a vertical cross-sectional view in the tunnel direction showing the construction procedure.

Claims (2)

[Claims] (1) Sequentially press-fit and connect the box-shaped hollow cross-section lower deck elements and side wall elements into the lining cross section, and fill the elements with concrete to form the entire brazing body of the lower deck portion and side wall portions. However, in the tunnel construction method in which the inside of the maple structure is excavated, the leading element is press-fitted into the lowest stage side wall element during excavation, followed by the main element having a reinforcing material inside and opening on the side. to replace the leading element and open the opening K of the main element.
)” A tunnel construction method characterized by integrating the lower slab and side walls by inserting and fixing reinforcing bars in the slab and pouring concrete. (2) The tunnel construction method according to claim 1, wherein the reinforcing members are vertical struts provided at a predetermined rectangular interval of 2.