JPS63165690A - Subway 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) The present invention relates to a method for constructing an underground passage that crosses under railroad tracks, under roads, and between the sides of embankments and the like.

(Conventional technology and its problems) There has long been a strong desire to create grade-separated intersections between railways and roads, for example as a countermeasure against railroad crossing accidents and road traffic congestion, and for this purpose construction as shown in Figure 8.9 has been carried out. It is being done.

This construction method involves excavating vertical shafts B and B on both sides of the planned underground structure that sandwich track A, and creating a large number of vertical shafts in the ground at an appropriate depth below track A in a direction approximately perpendicular to track A. After constructing the pipe roof protection by placing the steel pipes C closely parallel to each other and press-fitting them horizontally, the shoring that supports the earth retaining and steel pipes on the side from one shaft to the other is installed. This is a method of excavating a tunnel while constructing it.

However, according to this method, the steel pipe C is buried underground, thereby supporting the track A and the overburden part E, and constructing an underground passage under it. In addition to the diameter bone C, a work space is required between the underpass top and the pipe roof to create the underpass, and the underpass must be built deeper to accommodate this.

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, there is a drawback that the construction cost increases.

In addition, while excavating the ground using a Metsucel excavator, which has multiple Metsucel sheet piles lined up in parallel on all sides of the frame so that they can move back and forth, shoring is assembled following the excavation, and the surface of the shoring and the excavated ground is A method of interposing earth retaining sheet piles in between has also been adopted.

However, according to this excavation method, the earth retaining sheet piles are installed one after another as the Metsucel excavator advances, so the earth and sand may collapse during this time. Since the construction work was carried out, there were problems such as slow excavation of the Metsucel excavator and reduced work efficiency.

It is an object of the present invention to provide an underground passage construction method that solves these problems and enables efficient excavation of underground passages.

(Means for Solving the Problems) In order to achieve the above object, the underground passage construction method of the present invention includes a plurality of rectangular cross-section pipes each having a retaining plate arranged on the surface in contact with the ground. A pipe band with a width approximately equal to the width of the upper floor is formed over the entire length of the planned underground passage by press-fitting in parallel to the upper floor position, and a frame body approximately equal to the cross-sectional dimension of the planned underground passage is abutted to the rear end of this pipe band. Then, each pipe in the pipe band is pushed forward a certain distance one by one with the retaining plate left in place using a plurality of jacks provided on the frame, and then the frame is advanced and the pipes below the pipe band are pushed forward. excavating the ground according to the advancement of the frame;
The feature is that shoring or concrete segments are assembled in the inner space of the earth retaining plate obtained by this excavation, and the pipe band protruding outside the planned underground passage is removed by pushing. It is something to do.

(Function) A pipe strip with earth retaining plates arranged on the surface in contact with the ground is press-fitted in advance at the upper floor of the planned underground passage in the ground, so that the earth and sand can be reliably prevented from collapsing by the earth retaining plates. This system enables excavation through the ground and eliminates the conventional hassle of installing earth retaining sheet piles as the excavation process is done.Furthermore, the pipe belt has a section on the rear end of the pipe belt that is approximately equal to the cross-sectional dimension of the planned underground passage. With the frame in contact with each other, each pipe in the pipe band is pushed forward a certain distance in sequence with the retaining plate left behind by means of a plurality of jacks disposed on the frame, and then the frame is moved forward. The ground below the pipe band is excavated as the frame moves forward, and while each pipe in the pipe band moves forward and is removed, shoring or concrete segments are assembled on the inner surface of the earth retaining plate exposed at the rear of the frame. The construction work of the underground passage can be carried out without moving the earth and sand on the upper part of the plate and without adversely affecting the rails on the ground side, and the underground passage can be formed as shallow as the pipe belt.

In addition, earth retention plates are placed in advance on the surface of the pipe zone that contacts the ground to form earth retention over the entire length of the planned underground passage, so excavation work can be carried out efficiently. Underground tunnels can be built in the correct direction to ensure smooth construction.

(Example) To explain the example of the present invention with reference to the drawings, first,
As shown in the figure, a starting shaft αυ and a reaching shaft (2) are excavated on both sides of the road or rail (fl), etc. Next, a pipe (3) having a rectangular cross section is press-fitted horizontally from the starting shaft αυ side toward the arrival shaft α force.

On the upper surface of the pipe (3), a retaining plate (4) made of a strip steel plate having substantially the same planar shape as the pipe (3) is placed, and only the tip of the retaining plate (4) is connected to the pipe (3). ) by welding, etc. (5th
(see Figure and Figure 6).

Further, a plurality of bolt holes (3c) are bored in the inner surface facing the ground at the rear end of the pipe (3).

The pipe (3) is press-fitted by inserting an auger (not shown) inside the pipe while excavating the ground, and press-fitting one pipe (3) between the starting shaft αB and the destination shaft (transfer). Bury it in a straight line.

Furthermore, engagement protrusions (3a) (3b) (see Figure 5) provided on both sides of the pipe (3) that has already been press-fitted are provided protrudingly on the opposite side of the pipe (3) to be press-fitted. The pipes (3) are successively buried laterally while engaging the engaging protrusions (3a) or (3b), and as shown in Figure 3, the pipes (3) are buried in the entire width and both sides of the upper floor of the planned underground tunnel. This forms a pipe band (2).

In addition, using a short pipe (3), once one pipe is press-fitted, connect the next pipe to its rear end and press-fit it, and repeat this operation to connect the starting shaft OD and the arrival shaft surface. In this case, only the pipe at the front end has an earth retaining plate (
Fix the tip of 4) and attach it to the following short pipe (3).
) may be fitted with a retaining plate (4) of the same size as this so as to be slidable in the length direction.

After the pipe band (2) is press-fitted into the ground in this way, the adhesion between the tip of the pipe band (2) protruding toward the reaching shaft (2) and the tip of the earth retaining member (4) is removed by appropriate means such as cutting. At the same time, the rear ends of all earth retaining members (4) are anchored to the shaft reaction force receiving part via tie rods (21) or the like.

Furthermore, at the rear end of each pipe (3) of the pipe band (2),
As shown in Fig. 7, the small diameter part of the front end of the auxiliary short cylinder (5), which has the same external shape as the pipe (3) and is closed at the rear end, is inserted into the bolt hole (3c) (5a). ) to be bolted together and connected together.

(6) is a locking hole bored in the inner surface of the rear end of the auxiliary short cylinder (5).

Next, a frame (7) is installed inside the starting shaft αυ.

This frame body (7) consists of a push frame (7a) whose external shape is approximately equal to the cross-sectional external dimension of the planned underground passage, and a small rectangular receiving frame (7b) integrated into the front surface of the push frame (7a). (7
b) On the top surface and both side surfaces, guide surfaces (8) that slidably support the inner surface of the rear end of each pipe (3) of the pipe band (2) are protruded at regular intervals in the circumferential direction. The guide surface (8) is divided into parts via a partition piece (9), and a pin insertion locking hole is provided at the front and rear of each guide surface (8) in correspondence with the locking hole (6) of the auxiliary short cylinder (5). (10a) (10b) are drilled. On the other hand, in the push frame (7a), jacks α hot water are installed and fixed in correspondence with the rear ends of the pipes (3) supported by each guide surface (8) of the receiving frame (7b), and the rods of each jack Q3) are fixed. The distal end surface is pressed against the rear end of the auxiliary short cylinder (5).

Furthermore, a pin hole αa is drilled in the inner surface of the rear end of each pipe (3) of the pipe band (2), and a pin hole αa is drilled in the rectangular front frame a51 fitted to the inner circumferential surface of the pipe band (2). The pin holes αa are opposed to the respective pin holes α0, and the front frame αω and the receiving frame (
7b) are connected by a plurality of jacks αη.

Now, fix the locking holes (6) of all the auxiliary short cylinders (5) into the rear locking holes (10a) of the guide surface (8) by inserting pins, and one of them After pulling out the pipe (3) and uncoupling the pipe (3), push the pipe (3) forward by operating the jack (131) in the push frame (7a), and perform this operation on each pipe (3) in turn. When all the pipes (3) are press-fitted to a certain length, a pin is inserted between the locking holes (61 (10b)) of the auxiliary short cylinder (5) and the receiving frame (7b) to connect them together. .Then, the front frame 0ω is fixed to the inner circumferential surface of the pipe band (2) via the pin hole α◇0g) with a pin fastener, and in this state the jacking surface is operated in the direction that the rod contracts. The frame body (7) moves forward using the reaction force of the pipe band (2) press-fitted into the ground. Before or after this movement, the earth and sand surrounded by the pipe band (2) are passed through the frame body (7) by appropriate means. We will continue to excavate.

As the frame (7) moves forward, a retaining plate (
Since a space is formed in which the inner surface of 4) is exposed, a shiboko is assembled in the space surrounded by these earth retaining plates (4), and the earth retaining plate (4) is supported by the shoring α0.

After advancing the frame (7) by a certain length, disconnect the front frame (5) and receiving frame (7b) from the pipe (3), and operate the jack α in the push frame (7a) in the same manner as above. The pipe (3) is sequentially compressed, and then the jack αη on the side of the front frame aω is operated to advance the frame body (7) by a certain length in the same manner as described above.

In this way, the pipe band (2) moves forward by a certain length and the frame body (7
) and excavation of earth and sand are repeated, and in accordance with this, shoring is sequentially assembled in the space formed on the rear side of the frame (7) to support the inner circumferential surface of the earth retaining plate (4). To go.

The pipe band (2) protrudes to a certain length toward the reaching shaft (b) by being pressed by the frame (7), but the protruding portion is cut off as appropriate.

In addition, the adjacent shoring α marks α and the rear supports are connected by joint material Q91.

In this way, a tunnel is formed between the starting shaft C1S and the arrival shaft (b) in which the earth retaining plate (4) is supported by shoring 08+, and reinforcing bars are assembled between the shoring α and formwork is assembled inside it. The underground passage (2) is constructed by pouring concrete between the retaining plate (4) and the formwork.

Note that instead of the shoring α, the underground passage may be constructed by assembling concrete segments on the inner circumferential surface of the retaining plate (4) as the frame (7) moves forward.

In addition, in the above embodiments, locking holes, pin holes, front frame αω, and its jacks (171) were used for press-fitting the pipe band (2) and advancing the frame body (7), but the frame body (7) If the rod end of each jack α-shape provided in the push frame (7a) is integrally fixed to the rear end of each pipe (3), each pipe (2) of the pipe band (2) due to the expansion of the jack The press-fitting (3) and the advancement of the frame (7) by contraction can be easily performed.

(Effects of the Invention) As described above, according to the underground passage construction method of the present invention, a pipe belt with retaining plates arranged on the surface in contact with the ground is pressed into the upper floor position and both sides of the planned underground passage in the ground. Therefore, it is possible to excavate the ground below the earth retaining plate while reliably preventing collapse of the earth and sand, and it is possible to omit the trouble of installing earth retaining sheet piles etc. as the excavation progresses.

Furthermore, a frame body approximately equal to the cross-sectional dimension of the planned underground passage was brought into contact with the rear end surface of the pipe band, and each pipe of the pipe band was left with the earth retaining plate by a plurality of jacks arranged on the frame body. After pushing the frame forward for a certain length, the ground below the pipe belt is excavated as the frame moves forward, and while moving forward and removing each pipe in the pipe belt, the frame is moved forward. Shoring or concrete segments will be assembled on the inner surface of the exposed earth retaining plate, so
The earth and sand on the top of the earth retaining plate does not move, and the construction work of the underground passage can be carried out without adversely affecting the rails on the ground side, and the underground passage can be formed as shallow as the pipe band. This allows the frame to advance smoothly, and by using cast-in-place concrete for the underground passage, there is no need for propulsion reaction force, unlike when propelling a ready-made underground passage structure, and the construction period can be shortened. can.

In addition, because earth retention plates are placed on the top of the pipe belt in advance to form earth retention over the entire length of the planned underground passage, earth retention at the face during excavation is ensured and excavation work can be carried out efficiently. Moreover, since the underground passage can be formed using the earth retaining plate, the direction of construction of the underground passage can be accurately determined, and there is no need to control the direction, so that the underground passage can be smoothly constructed.

Furthermore, since it is possible to excavate an underground passage even if the height of the earth covering the earth retaining plate is reduced, an underground passage with a short approach can be obtained.

[Brief explanation of the drawing]

1 to 7 show embodiments of the present invention.
The figure is a simplified longitudinal side view of the underpass being constructed.
The figure is an enlarged vertical side view of the main part, Figure 3 is a vertical front view,
Figure 4 is a perspective view of the frame, Figure 5 is a vertical front view of the pipe,
FIG. 6 is a vertical side view of the same, FIG. 7 is a vertical side view of the auxiliary short cylinder, and FIG. 8 is a vertical side view showing the conventional underground tunnel construction method.
FIG. 9 is a longitudinal sectional front view thereof. (2)...pipe band, (3)...pipe, (4)...
...Earth retaining plate, (7)...Frame, (7a)...
Push frame, (7b)... Receiving frame, αυ... Starting shaft, α2
)...Reaching shaft, 03)...Jackie, α8)...
・Shoring.

Claims (1)

[Claims] (1) A plurality of rectangular cross-sectional pipes with retaining plates arranged on the surface in contact with the ground are press-fitted in parallel at least at the upper floor position of the planned underpass to create a pipe band with a width approximately equal to the upper floor width over the entire length of the planned underpass. A frame body approximately equal to the cross-sectional dimension of the planned underground passage is brought into contact with the rear end face of this pipe band, and each pipe of the pipe band is connected to the earth retaining plate by a plurality of jacks arranged on the frame body. After the pipe is left in place and pushed forward a certain length one by one, the frame is moved forward and the ground below the pipe belt is excavated as the frame moves forward, and the space on the inner surface of the retaining plate obtained by this excavation is 1. A method for constructing an underground passage, which comprises assembling shoring or concrete segments in the area and removing the pipe band protruding outside the planned underground passage by pushing.