JPH0439558B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for constructing an underground passage that crosses under railway tracks or under roads.

(Prior Art) 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 for this purpose, construction as shown in Figures 8 and 9 has recently been carried out.

In other words, vertical shafts B and B' are excavated on both sides of the planned underground structure across track A, and a large number of steel pipes are installed in the ground at an appropriate depth under track A in a direction approximately perpendicular to track A. After constructing the pipe roof protection work by horizontally press-fitting 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.

(Problems to be Solved by the Invention) However, according to this method, the steel pipe C is buried underground, thereby supporting the track A and the earth cover E, and constructing an underground passage under it. Therefore, in addition to the earth cover E and the diameter of the steel pipe C, a work space is required between the underpass top and the pipe roof to construct the underpass, and the underground can only be built deeper by this amount. Must be.

Therefore, there are problems in that the slope F for entering the underground passage becomes steep or the slope portion becomes long, and the construction cost increases because the steel pipe C cannot be removed.

The present invention provides an underground passage construction method aimed at solving these problems.

(Means for Solving the Problems) In order to achieve the above object, the underground passage construction method of the present invention includes placing a friction cut member over the entire length on the upper surface of a pipe having a rectangular cross section. The tip of the cut member is fixed to the tip of the pipe, and while excavating the ground in front of the pipe, the excavated soil is removed through the hollow interior of the pipe, so that multiple pipes are arranged in parallel at the upper floor position over the entire length of the planned underground passage. a step of burying the pipe so as to form a pipe band having a width approximately equal to the width of the upper floor; a step of constructing abutments in the length direction of the pipe at the lower part of both ends of the pipe band; A step of releasing the adhesion between the tip of the member and the tip of the pipe and fixing the rear end of the friction cut member to an appropriate place such as the ground, and contacting the front end surface of the ready-made upper floor member to the rear end surface of the pipe band, and jacking etc. The method is characterized by comprising the steps of: advancing the upper floor member by the means described above and replacing the pipe band with the upper floor member using the abutments on both sides as guides while leaving the friction cut member; and excavating the ground below the upper floor member. That is.

(Function) A friction cut member is placed on the top surface of a pipe with a rectangular cross section, and the tip of the friction cut member is fixed to the tip of the pipe, so the hollow interior of the pipe is used to prevent the ground in front of the pipe from moving. While excavating the excavated earth and sand through the hollow interior, the friction cut member can be press-fitted into the ground together with the pipe, and a plurality of these pipes can be press-fitted into the upper floor position of the planned underground tunnel to meet the upper floor width. Since pipe bands of approximately equal width are formed, bridge abutments can be easily constructed using the pipes as guides below both sides of the pipe band.Furthermore, the bridge abutment can be easily constructed by using the pipes as guides on both sides of the pipe band. After releasing the fixation of the friction cut member, the front end face of the ready-made upper floor member is brought into contact with the rear end face of the pipe band and the upper floor member is pressed by means such as jacking, and the friction cut member is left in the ground. The upper floor member is smoothly press-fitted while sliding the pipe strip using the lower surface of the friction cut member as a guide, and the pipe strip and the upper floor member are easily replaced.

A desired underground passage is constructed by excavating the ground below the upper floor member thus formed in the ground.

(Example) Next, an example of the present invention will be described with reference to the drawings regarding a method for constructing an underground passage that crosses under a track.

This underground passage 1 is for a roadway, and as shown in FIG. 7, is provided under a track 2 in a direction perpendicular to the track 2, and has abutments 4, 4 serving as a walkway 3 on both sides thereof. A flat upper floor member 5 is also constructed between the upper surfaces of the abutments 4, 4, and further, the abutments 4, 4
A lower floor board 6 is installed between the bottom parts of the floor.

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 excavated in the direction across the track at the location where the upper floor components of the planned underground passage 1 are planned to be installed. That is, a box-shaped pipe 9 having a hollow rectangular cross section is press-fitted horizontally in the direction of the underground passage.

At this time, an excavator such as an auger (not shown) is inserted into the rectangular cross-sectional pipe 9, and while excavating the ground in front of the pipe under the track surface, the rear end of the pipe is pressed with a jack etc. The excavated soil is forced in until it reaches the pipe, and the excavated soil is carried out backwards inside the pipe by an auger screw.

As shown in FIGS. 3 and 4, 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 the upper surface of the pipe 9, a friction cut member 12 made of a band-shaped steel plate having a width approximately equal to the width of the pipe is placed over the entire length of the pipe,
Only the tip of the friction cut member 12 is fixed to the tip of the pipe 9 by screwing, welding, or the like.

After the pipe 9 with the friction cut member 12 disposed on the upper surface is press-fitted into the ground as described above, the opposite side surface of the next pipe 9 is aligned with the side surface of the pipe 9 in the same manner, and then the pipe 9 is protruded. Article 1
0, 10, 11, and 11 are press-fitted in a state in which they are engaged with each other while not being vertically misaligned, and by repeating this operation, the adjacent side surfaces are brought into close contact with each other, and a plurality of pipes 9 are arranged in parallel in the horizontal direction. A pipe band 13 is formed.

The width of this pipe band 13 is formed to be approximately equal to the width of the upper floor member, which will be described later.

Next, a plurality of ordinary circular pipes 14 are press-fitted into both ends of the pipe band 13 as needed in parallel in the width extension direction of the pipe 13, and then the circular pipe group and the pipe band 13 are used as a pipe roof. As shown in FIG. 1, abutments 4, 4, which will become a walkway 3, are constructed on the ground below both sides of the pipe band 13 by a known method.

15 is the shoring at that time, and 16 is the earth retaining sheet pile.

Next, support piles 17, 17 are driven from the ground surface toward the upper surfaces of both sides of the abutment 4, and the support piles 17, 17 are
By constructing a construction girder 18 between the construction girders 17 and 17, the track 2 is received by the construction girder 18, and then,
The ground under the construction girder 18 is excavated and the pipes 9, 14 on the abutments 4, 4 are removed, and as shown in FIG.
9 is cast and formed over the entire length of the abutment 4. The upper surface of the stepped portion 20 of this seat 19 is on the same plane as the lower surface of the pipe band 13 or is slightly elevated.

As described above, by making the upper surface of the stepped portion 20 of the catch seat 19 flush with or slightly higher than the lower surface of the pipe band 13, and by making the thickness of the flat upper floor member 5 the same as the pipe 9 or slightly thinner. Therefore, when the upper floor member 5 is placed on the upper surface of the stepped portion 20, the top end surface of the upper floor member 5 can be made flush with the top end surfaces of the pipes 9, 9..., and the bottom of the upper floor member 5 can be The end face can be brought into contact with the ground below the upper floor member 5, or a slight gap can be formed. Therefore, as will be described later, the thrust when propelling the upper floor member 5 can be reduced, and the earth and sand in the ground below the upper floor member can be pushed without having to be excavated and removed.

In this way, the stepped portions 2 are placed on the upper surfaces of both abutments 4, 4.
0 and 20 are provided in parallel, and then a ready-made flat plate-like upper floor member 5 having the same thickness as the pipe band 13 or slightly thinner is placed in one shaft 7 in a horizontal state. A sixth
A plurality of jacks 22 are installed as shown in the figure.

Before operating this jack 22,
The friction cut members 12 placed on the upper surfaces of all the pipes 9 having a rectangular cross section, which constituted the pipes 3, are cut and separated at the tip fixed to the pipes 9, or the fixed members are removed, and all the friction cut members 1 are removed.
2 to the reaction wall 21 with the turnbuckle 23
Fix it with etc.

Thereafter, when this jack 22 is operated to press the upper floor member 5, the pipe band 13 reaches the vertical shaft 8.
As the upper floor member 5 is pushed out to the side, the lower surface of the friction cut member 12 and the stepped portion 20 of the seat 19
Move forward while being guided.

Furthermore, in order to move the upper floor member 5 forward, in addition to pressing it with the jack 18, the pipe 13
A strand or the like may be inserted therein and fixed to the upper floor member 5, and the upper floor member 5 may be advanced by pulling the strand from the reaching shaft side.

At this time, the retaining pile 17 above the pipe belt 13
is received on the friction cut member 12, and the friction cut member 12 is fixed by the turnbuckle 23, etc., so that despite the movement of the pipe band 13, the earth and sand 24 in the earth retention pit 17 and the surface layer of the ground are It does not move, and therefore there is no risk that the construction piles 13 or the track 2 will move.

In addition, the upper floor member 5 is formed by integrating a plurality of parallel H steels 25 into a concrete plate shape as a main material, and the length thereof may be formed to be equal to the total length of the upper floor member 5. It may be divided.

In this way, the upper floor member 5 is advanced along the lower surface of the friction cut member 12, the pipe 13 is discharged to the reaching shaft 8 side, and the upper floor member 5 and the pipe band 13 are replaced.

Next, the construction girders 18 and earth retaining piles 17 are removed, and the space is backfilled with earth and sand, and further, from one shaft 7 side to the other shaft 8, the lower surface of the upper floor member 5 and the side surface of the abutment 4, 4 are removed. The ground surrounded by the tunnel is excavated, the retaining sheet piles 16 are removed, and a subfloor board 6 is laid or concrete is poured to construct an underground passage.

In addition, when replacing the pipe band 13 with the upper floor member 5, the seat 19 serving as a guide may be provided integrally with the abutment 4, 4. In other words, the pipe band 13 and It is only necessary to make it possible to replace the upper floor member 5.

(Effects of the Invention) As described above, the present invention places a friction cut member on the upper surface of a pipe having a rectangular cross section, fixes the tip of the friction cut member to the tip of the pipe, and fixes the tip of the friction cut member to the tip of the pipe. By excavating the ground and removing the excavated earth and sand through the hollow interior, multiple pipes are buried in parallel at the upper floor position over the entire length of the planned underground passage, and pipes with a width approximately equal to the upper floor width are constructed. forming a band, then
After constructing abutments in the length direction of the pipe at the bottom of both ends of this pipe band, the front end surface of the ready-made upper floor member is brought into contact with the rear end surface of the pipe band, and the tip of the friction cut member and the tip of the pipe are brought into contact with each other. and fix the rear end of the friction cut member to a suitable place such as the ground, and in this state press the upper floor member by means such as jacks to guide the abutments on both sides while leaving the friction cut member in place. Since this relates to an underground passage construction method characterized by replacing the pipe band and the upper floor member, and then excavating the ground below the upper floor member, it is necessary to install a plurality of pipes with a rectangular cross section in the upper floor member of the planned underground tunnel. After press-fitting a pipe band consisting of 300 yen, this pipe band and the upper floor member are replaced, so compared to conventional construction methods, the underground passage formed below the upper floor member is shallower due to the height of the pipe roof and the work space. Therefore, the approach can be shortened.

Furthermore, when the pipe band is press-fitted, the friction cut member placed on the top surface of each pipe has its tip fixed integrally to the tip of the pipe, so the friction cut member can be easily press-fitted integrally with the pipe. By press-fitting a plurality of these pipes along the entire length into the upper floor position of the planned underground passage to form a pipe band with a width approximately equal to the width of the upper floor, the pipes can be used as guides below both sides of the pipe band to form the bridge abutment. It can be easily constructed.

Furthermore, after releasing the fixation of the friction cut members to the ends of each pipe of the buried pipe band and fixing the rear ends of the friction cut members to a suitable place such as the ground, ready-made upper floor members are attached to both end surfaces of the pipe band. Since the front end surface of the friction cut member is brought into contact with the upper floor member and pressed by means such as jacking, the upper floor member is moved while sliding the pipe band using the lower surface of the friction cut member as a guide with the friction cut member remaining in the ground. can be press-fitted smoothly, and the pipe band and upper floor member can be easily replaced. At the time of this replacement, the friction cut member reliably prevents the movement of overburden earth and sand, and prevents any negative impact on the track etc. It's something that doesn't exist.

In addition, since the pipe strips are recovered, they can be reused, which reduces construction costs. Since it is excavated, the upper load is reliably supported by the upper floor member without bending unlike pipes, and the excavation work can be carried out safely and smoothly.

[Brief explanation of drawings]

Figures 1 to 7 show embodiments of the present invention, and Figures 1 and 2 are simplified vertical cross-sectional front views for explaining the construction method of the pipe band, both abutments, and seats, and Figure 3. 4 is a front view of a pipe with a rectangular cross section, FIG. 4 is a partial longitudinal side view thereof, FIG. 5 is a simplified longitudinal sectional front view with the pipe band and upper floor member replaced, and FIG. 6 is a simplified longitudinal sectional view showing the replacement method. FIG. 7 is a simplified vertical front view of the constructed underground passage, FIG. 8 is a simplified vertical side view for explaining the conventional construction method, and FIG. 9 is a simplified vertical front view thereof. 1...underpass, 2...trail, 3...walkway, 4...
...Bridge abutment, 5... Upper floor member, 7, 8... Vertical shaft, 9...
... Pipe with rectangular cross section, 12 ... Friction cut member, 13 ... Pipe band.

Claims (1)

[Claims] 1. A friction cut member is placed over the entire length on the upper surface of a pipe having a rectangular cross section, and the tip of the friction cut member is fixed to the tip of the pipe,
By excavating the ground in front of these pipes and removing the excavated earth and sand through the hollow interior, multiple pipes will be buried parallel to each other at the upper floor position over the entire length of the planned underground passage, and the width will be approximately equal to the upper floor width. a step of forming an abutment in the length direction of the pipe at the lower part of both ends of the pipe; and a step of releasing the adhesion between the tip of the friction cut member and the tip of the pipe and removing the friction. A step of fixing the rear end of the cut member to a suitable place such as the ground, and a step of bringing the front end surface of a ready-made upper floor member having the width of the planned underground passage into contact with the rear end surface of the pipe band and advancing the upper floor member by means such as jacking. A method for constructing an underground passage comprising the steps of: replacing the pipe band with the upper floor member using the abutments on both sides as guides while leaving the friction cut member in place; and excavating the ground below the upper floor member.