JPS6375287A - Method of construction of underground passage - Google Patents

Abstract

(57) [Abstract] 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 constructing an underground passage that crosses under railway tracks or under roads.

(Conventional technology) As a countermeasure for railway crossing accidents and road traffic congestion, there is a strong demand for grade-separated intersections between railways and roads (for this reason, construction as shown in Figure 8.9 has recently been carried out). .

In other words, a vertical shaft (B) (B) is excavated on both sides of the planned underground structure across the track (A), and a shaft is dug into the ground at an appropriate depth below the track (A), approximately approximately relative to the track (A). After constructing the pipe roof protection work by arranging a large number of steel pipes (C) closely parallel to each other in the right angle direction and press-fitting them horizontally,
A method has been implemented in which a tunnel is excavated from one shaft to the other while constructing a support (D) that supports earth retaining and steel pipes on the side.

(Problems to be Solved by the Invention) However, according to this method, the steel pipe (C) is buried underground, and thereby the track (^) and the soil break (
Since the purpose is to support pipe E) and construct an underground passage below it, in addition to the earth breakage (E) and the diameter of the steel pipe (C), when constructing the crown of the underground passage between the top of the underground passage and the pipe roof. work space would be required, and the underground passage would have to be built deeper to accommodate this.

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 problem) In order to achieve the above object, the underground passage construction method of the present invention includes:
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, and a plurality of these pipes are placed over the entire length at the upper floor position of the planned underground passage. forming a pipe strip having a width approximately equal to the width of the upper floor; building abutments in the length direction of the pipes at both ends of the pipe strip; and the friction cutting step. The step of releasing the adhesion between the tip of the member and the tip of the pipe, and abutting the front end surface of the ready-made upper floor member against the rear end surface of the pipe band, and moving the upper floor member forward by means such as jacking, leaving the friction cut member intact. This method is characterized by comprising a step of replacing the pipe belt and the upper floor member using the abutments on both sides as guides, and a step of excavating the ground below the upper floor member.

(Function) Since the friction cut member is placed on the top surface of the pipe with a rectangular cross section and the tip of the friction cut member is fixed to the tip of the pipe, the friction cut member and the pipe are press-fitted into the ground together. A plurality of these pipes are press-fitted into the upper floor of the planned underground passage to form a pipe band with a width approximately equal to the width of the upper floor, making it easy to construct abutments using the pipes as guides below both sides of the pipe band. Furthermore, after releasing the friction cut member from the end of each pipe in the buried pipe strip, the front end surface of the ready-made upper floor member is brought into contact with the rear end surface of the pipe strip to perform jacking, etc. When the upper floor member is pressed by the above means, the upper floor member is smoothly press-fitted while the pipe strip is slid using the lower surface of the friction cut member as a guide, with the friction cut member remaining in the ground, and the pipe strip and the upper floor member are bonded together. can be easily replaced.

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

(Embodiment) Next, an embodiment 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. Bridge abutment (4)
(4) and a flat plate-shaped upper floor member (5) is constructed between the upper surfaces of the abutment (41 (41), and furthermore, the abutment (4, 1
(It is made by laying a lower floor board (6) between the bottoms of 41.

To construct such an underground passage, first, a vertical shaft (71f81) is excavated in the ground on both sides of the track (2), and then one vertical shaft (71f81) is excavated in the ground where the upper floor components of the planned underground passage (1) are planned to be installed.
7) Press-fit a box-shaped pipe (9) with a hollow rectangular cross section horizontally in the direction across the track, that is, 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) to excavate the ground below the track surface, and the rear end of the pipe is pressed with a jack or the like to open the other vertical shaft ( 8), and the excavated soil is carried out backwards inside the pipe by an auger screw.

As shown in Fig. 3.4, the pipe (9) has a blade part (9a) that slopes inward at its tip end, and a blade part (9a) that slopes inward on both sides. Projection 00) α0
), αυaυ is provided protrudingly, and a protruding ridge 00)α0) is provided on one side.
The dimension between the opposing inner surfaces is equal to the dimension between the upper surface of the upper protrusion αB and the lower surface of the lower protrusion αB on the other side.

Further, on the upper surface of the pipe (9), a friction cut member α force made of a strip-shaped steel plate whose width is equal to the width of the pipe is placed over the entire length of the pipe, and only the tip of the friction cut member is connected to the pipe (9). ) is fixed to the tip by screws, welding, or other means.

After the pipe (9) with the friction cut member αω arranged on the top surface is press-fitted into the ground as described above,
Similarly, the opposite side surface of the next pipe (9) is matched with the side surface of the pipe (9), so that αω of the protrusion α, Ql)
The pipes (9) are compressed with the pipes (Ql) engaged with each other and not vertically misaligned, and by repeating this process, the adjacent sides are brought into close contact with each other, resulting in a plurality of pipes (9) arranged in parallel in the horizontal direction. Forms a pipe belt α-yong.

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

Next, if necessary, a plurality of ordinary circular pipes αω are press-fitted into both ends of the pipe band α in parallel in the width extension direction of the pipes, and then the circular pipe group and the pipe band α are attached to the pipe roof. As shown in Figure 1, there are abutments (4) (4) that will become walkways (3) on the ground below both sides of the pipe belt
) is constructed by a known method.

α is the shoring at that time, and αω is the earth retaining sheet pile.

Next, support piles α7)Qη are driven from the ground surface toward the upper surfaces of both sides of the abutment (4), and a construction girder a is erected between the support piles αηαη. After that, the ground under the construction girder QlO was excavated, the pipe (9) αω on the abutment (4) +41 was removed, and the guide step was installed on the abutment (4) as shown in Figure 2. (
A catch seat α9 having a cross-sectional shape of 2 is cast and formed over the entire length of the abutment (4). The upper surface of the stepped portion QΦ of this seat Q9) is on the same plane as the lower surface of the pipe band α or slightly higher.

As mentioned above, the upper surface of the step part (2 m) of the catch seat α [with] is made flush with or slightly higher than the lower surface of the pipe band a1, and the thickness of the flat upper floor member (5) is the same as that of the pipe (9). By making it slightly thinner, the upper floor member (5
) is placed, the top surface of the upper floor member (5) can be made flush with the top surface of the pipe T9) (9)..., and the lower end surface of the upper floor member (5) can be placed on the same surface as the top surface of the pipe T9) (9)... Parts (5
) Can be in contact with the ground below or can form a slight gap. Therefore, as will be described later, the thrust force when propelling the upper floor member (5) can be reduced,
Moreover, the earth and sand on the ground below the upper floor member can be pushed forward without having to be excavated and removed.

In this way, the upper surfaces of both abutments (4) (4) have stepped portions (2
After installing one parallel strike plate αI (2 m), horizontally install a ready-made flat upper floor member (5) having the same thickness or slightly thinner thickness as the pipe belt αI in one shaft (7). The upper floor member (5) is arranged in such a manner that its front end surface is in contact with the rear end surface of the pipe band a■, and between the rear end surface of the upper floor member (5) and the reaction wall (21) provided on the wall surface of the shaft (7). A plurality of jacks (22) are installed as shown in FIG.

Before operating this jack (22), cut the friction cut members @ placed on the top surfaces of all the rectangular cross-section pipes (9) that made up the pipe band α■ at the tip fixation part with the pipe (9). , remove the separating or fixing members, and connect the rear ends of all friction cut members @ to the reaction wall (2).
1) with a turnbuckle (23), etc.

Thereafter, when this jack (22) is operated to press the upper floor member (5), the pipe band αm is pushed out toward the reaching shaft (8), and the upper floor member (5) is pressed against the lower surface of the friction cut member α and the receiver. It moves forward while being guided by the two steps (2 (O).

Furthermore, in order to advance the upper floor member (5), in addition to pressing it with the jack aFA, a strand or the like is inserted into the pipe aJ and fixed to the upper floor member (5), and the strand is pulled from the reaching shaft side. The upper floor member (5) may be advanced.

At this time, the retaining pile αη above the pipe band Q31 is received on the friction cut member @, and the friction cut member (B) is fixed with a turnbuckle (23) etc., so the pipe band α■ Despite the movement, the retaining piles αη and the earth and sand (24) on the surface layer of the ground do not move, and therefore there is no risk that the construction zero mark or the track (2) will move as well.

The upper floor member (5) is made by integrating a plurality of parallel H steels (25) into a concrete plate, and its length is equal to the total length of the upper floor member (5). or may be divided.

In this way, the upper floor member (5) is connected to the friction cut member (2).
), move the pipe α hot water forward along the lower surface of the vertical shaft (8
) side to replace the upper floor member (5) and pipe band 0■.

Next, the construction girders α and the earth retaining piles 0η are removed, and the space is backfilled with earth and sand, and the lower surface of the upper floor member (5) is moved from one shaft (7) side to the other shaft (8). The ground surrounded by the sides of the bridge abutment (41) is excavated, the retaining sheet pile Oe is removed, and the subfloor board (6) is laid or concrete is poured to construct an underground passage.

In addition, when replacing the pipe belt Q3) with the upper floor member (5), the guide seat α may be provided integrally with the abutment (41), in other words, the abutment (4) (4) What is necessary is to be able to replace the pipe band α and the upper floor member (5) using the upper surface as a guide.

(Effects of the Invention) As described above, the present invention has a friction cut member placed on the upper surface of a pipe having a rectangular cross section, the tip of the friction cut member fixed to the tip of the pipe, and a plurality of pipes, A pipe strip with a width approximately equal to the width of the upper floor is formed by press-fitting in parallel to the upper floor position of the planned underpass, and then abutments are constructed at both ends of this pipe strip in the length direction of the pipes. , 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 end of the pipe are released from each other, and in this state, the upper floor member is pressed by means such as a jack to remove the friction. This is an underground passage construction method characterized by replacing the pipe belt and upper floor members using the abutments on both sides as guides while leaving the cut parts, and then excavating the ground below the upper floor members. After press-fitting a pipe band consisting of multiple rectangular cross-sectional pipes into the upper floor member, this pipe band and the upper floor member are replaced, so compared to the conventional construction method, the height of the pipe roof and the lower part of the work space are reduced. This allows the underground passage to be formed to be shallower, and therefore the approach can be made shorter.

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. Since a plurality of these pipes are press-fitted into the upper floor position of the planned underground tunnel to form a pipe band with a width approximately equal to the width of the upper floor, abutments can be easily constructed using the pipes as guides below both sides of the pipe band. It is something that can be done.

Furthermore, after releasing the friction cut member from the tip of each pipe in the buried pipe band, the front end surface of the ready-made upper floor member is brought into contact with both end surfaces of the pipe band, and the upper floor member is pressed by means such as jacking. Therefore, with the friction cut member remaining in the ground, the pipe strip can be slid using the lower surface of the friction cut member as a guide and the upper floor member can be smoothly press-fitted, and the pipe strip and the upper floor member can be easily replaced. At the time of this replacement, the friction cut member reliably prevents the movement of overburdened earth and sand, and does not cause any negative impact on the track or the like.

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 the drawing]

1 to 7 show embodiments of the present invention.
Figures 2 and 2 are simplified longitudinal sectional front views for explaining the construction method of the pipe band, both abutments, and seats, Figure 3 is a front view of a pipe with a rectangular cross section, and Figure 4 is a side view partially cut in dark blue. , FIG. 5 is a simplified longitudinal sectional front view with the pipe band and upper floor member replaced;
Figure 6 is a simplified vertical side view showing the replacement method, Figure 7 is a simplified vertical front view of the constructed underground passage, Figure 8 is a simplified vertical side view to explain the conventional construction method, and Figure 9 is the same. It is a simplified vertical front view. (1)...underpass, (2)...trail, (3)...
Alley, (4)... Bridge abutment, (5)... Upper floor member, (7
) (81...vertical shaft, (9)...rectangular cross-sectional pipe, α...friction cut member, 0th floor...pipe band. Patent applicant: Okumura Gumi Co., Ltd. E+J/'Rofushiu Pe 1 pay shibe ZA →N 5 Koimabe 5 ≦X zoJ ha pe 4 hashibe 7 mu) A δ Ha, Z'? /ha

Claims (1)

[Claims] 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, and a plurality of these pipes are placed over the entire length at the upper floor position of the planned underground passage. forming a pipe strip having a width approximately equal to the width of the upper floor; building abutments in the length direction of the pipes at both ends of the pipe strip; and the friction cutting step. A step of releasing the adhesion between the tip of the member and the tip of the pipe, and abutting the front end surface of the ready-made upper floor member against the rear end surface of the pipe band, and moving the upper floor member forward by means such as a jack, leaving the friction cut member intact. An underground passage construction method characterized by comprising a step of replacing a pipe band and an upper floor member using both side abutments as guides, and a step of excavating the ground below the upper floor member.