JPH0135160B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for propelling an underground passage structure that traverses under railroad tracks or under roads.

As a countermeasure against railroad crossing accidents and road traffic congestion, there is a strong desire to create grade-separated intersections between railways and roads, and to this end, construction projects such as those shown in Figures 1 and 2 have recently been carried out.

That is, vertical shafts B and B' are excavated on both sides of the planned underground structure with track A in between, and a large number of vertical shafts are drilled in the ground at an appropriate depth below track A, approximately perpendicular to track A and horizontally. After constructing the pipe roof protection work by horizontally press-fitting steel pipes C in close parallel to each other, shoring D is installed to support the earth retaining and steel pipes on the side from one shaft to the other. A method is being implemented in which the tunnel is excavated while the tunnel is being constructed.

However, according to this method, the steel pipe C is buried underground, thereby supporting the track A and the overburden portion E, and constructing an underground passage below it. In addition to the diameter of pipe C, a work space is required between the underpass top and the pipe roof when constructing the underpass top, and the underpass must be built deeper by this amount.

Therefore, the slope F for entering the underground passage becomes steep or the slope portion becomes long, and since the steel pipe C cannot be removed, the construction cost increases.

In order to eliminate such drawbacks, the present invention press-fits a plurality of pipes along the cross-sectional periphery of the planned underground passage, excavates the ground surrounded by the pipes, and then connects the end face of the ready-made underground passage structure with the pipes. This provides a method for constructing an underground passage by abutting the end face of the pipe, press-fitting the underground passage structure, and replacing the pipe and the underground passage structure.

Next, a method of promoting an underground passage structure that crosses under a track according to an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 3, this underground passage 1 is provided below a track 2 in a horizontal direction perpendicular to the track 2.

To construct such an underground passage, first, shafts 7 and 8 are excavated in the ground on both sides of the track 2, and then one shaft 7 is opened at the planned location of the planned underground passage 1 in a direction across the track, that is, an underground passage. A box-shaped pipe 9 having a hollow rectangular cross section is horizontally press-fitted in the direction.

As shown in FIGS. 4 and 5, the box-shaped pipes 9 are press-fitted over the entire outer circumference of the planned underground passage structure 3, that is, at the upper and lower floors and both side walls.
9. Bringing mutual aspects into close contact.

At this time, an excavator such as an auger (not shown) is inserted into the rectangular cross-sectional pipe 9 to excavate the ground below the track surface, and the rear end of the pipe is pressed with a jack or the like to reach the other shaft 8. The excavated soil is then carried out backwards inside the pipe by an auger screw.

As shown in FIGS. 6 and 7, the pipe 9 has a tip end face formed with a blade part 9a that slopes inwardly, and protrusions 10 extending in the length direction on the upper and lower ends of both sides. 10, 11, 11 are provided in a protruding manner, and the dimension between the opposing inner surfaces of the protrusions 10, 10 on one side is made equal to the dimension between the upper surface of the upper protrusion 11 and the lower surface of the lower protrusion 11 on the other side. .

Further, on one side of the pipe 9, there is provided a friction cut member 1 made of a strip-shaped steel plate approximately equal in width to the pipe.
2 is placed over the entire length of the pipe 9, and only the tip of the friction cut member 12 is fixed to the tip of the pipe 9 by screwing or other means.

The pipe 9 with such a friction cut member 12 disposed on one side is placed approximately in line with the outer edge of the underpass structure, and is press-fitted into the ground as described above, and then the pipe 9 is cut in the same manner. 9 and the opposite side of the next pipe 9, press fit the protrusions 10, 10, 11, 11 so that they are engaged with each other and do not cut vertically, and repeat this operation. The pipe roof 13 is formed along the cross-sectional outline of the underground passage structure 3 by bringing the adjacent side surfaces into close contact with each other.

In this case, the friction cut members 12 do not have to be present on all of the pipe roof 13, as shown in FIGS. 4 and 5, or on the side surfaces, as shown in FIG.

In addition, the pipes do not necessarily have to be in close contact with each other on the sides at the bottom of the underpass structure.

Next, the ground 5 surrounded by the pipe roof 13 is excavated while constructing supports 4 at predetermined intervals from either one of the shafts.

Furthermore, as shown in FIG. 3, a pedestal 6 with rollers is provided in the shaft 7, and an underground passage structure 3 is disposed thereon, and its front end is attached to the rear end surface of the pipe roof 13 via the frame 14. A frame 16 having the cross-sectional shape of the underground passage structure 3 is placed between the rear end surface and the reaction wall 15 provided on the wall surface of the shaft 7.
A jack truck 18 having a plurality of jacks 17 for pressing at appropriate intervals is arranged.

Before operating this jack 17, the friction cut member 12 is placed on one side of all the rectangular cross-section pipes 9 that constitute the pipe roof 13.
is cut and separated at the tip fixed part with the pipe 9, or the fixed member is removed, and the rear end of all the friction cut members 12 is connected to the reaction wall 1 via the H steel 19.
5 with a darn buckle 20, etc.

Thereafter, when the jack 17 is operated to press the underpass structure 3 through the frame 16, the underpass structure 3 moves forward together with the pedestal 6 equipped with rollers.
The pipe roof 13 is pushed out to the other shaft 8 side together with the frame 14 and the shoring 4.

At this time, the friction cut member 12 is separated from the pipe 9 at the tip, and the rear end is fixed by the turnbuckle 20 via the H steel 19, so it does not move even if the pipe roof 13 moves forward.
The underpass structure 3 has its friction cut member 1
It will slide in contact with 2. Therefore, the ground around the underground structure 3 is covered with friction cut members 12.
Since it is separated from the underpass structure 3 by the underpass structure 3, it will not be affected in any way despite the movement of the underpass structure 3.

In particular, the friction cut member 12 at the lower part of the pipe roof 13 serves as a guide for the underground passage structure 3.

Note that the underground passage structure 3 may be divided in its length direction.

In this way, the underpass structure 3 is advanced along the friction cut member 12 of the pipe roof 13,
The underground passage is advanced so that the plurality of pipes 9 are discharged to the other shaft 8 side and the underground passage structure 3 and the pipe roof 13 are replaced.

As described above, according to the method of the present invention, the underground passage formed below the upper floor member can be made shallower by the height of the pipe roof 13 and the work space, compared to the conventional construction method, and therefore the approach can be made shorter and shorter. Moreover, since the friction cut member 12 is arranged on the upper surface of the pipe 9,
When the pipe roof 13 and the underground passage structure 3 are replaced, the earth and sand covered by the earth do not move, and the track etc. are not adversely affected.

In addition, the excavation cross section is equal to the underpass structure cross section,
The amount of soil to be excavated is small, and the ground inside the pipe roof 3 is excavated before replacement, so it is light in weight and requires little pressing force.Moreover, it is safe and shortens the construction period because it is a complete, ready-made structure. Since the friction cut member on the lower surface slides as a guide, the pushing force is small and it can be propelled accurately.Furthermore, since the pipe 9 is recovered, it can be reused, so the construction cost is economical. It has many features such as:

[Brief explanation of drawings]

FIG. 1 is a simplified side view showing the conventional method, FIG. 2 is a simplified front view thereof, and FIGS. 3 to 8 show examples of the method of the present invention, and FIG. 3 is a simplified side view thereof. , FIGS. 4 and 5 are simplified front views thereof,
Figure 6 is a front view of the friction cut member;
FIG. 7 is a longitudinal sectional side view thereof, and FIG. 8 is a simplified front view showing another embodiment. 1... Underpass, 2... Track, 3... Underpass structure, 5... Ground, 7, 8... Vertical shaft, 9... Box-shaped pipe, 12... Friction cut member, 13...
...Pipe roof, 17... Jyatsuki.

Claims (1)

[Claims] 1. A plurality of pipes with a rectangular cross section each having a friction cut member arranged on one side are press-fitted in parallel around the outer periphery of the planned underground passage with the friction cut member positioned on the outside, thereby changing the cross-sectional shape of the underground passage. form a pipe roof approximately equal to , then excavate the ground surrounded by the pipe roof by assembling shoring inside the pipe roof, and abutting the front end surface of a ready-made underground passage structure against the rear end surface of the pipe roof, In this state, the underpass structure is pressed by means such as a jack, and the pipe roof and the underpass structure are replaced by using the lower friction cut member as a guide while leaving the friction cut member in place. A method for promoting underground passage structures.