JPH049920B2 - - 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.

(Conventional technology and its problems) There has 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 reason, the construction shown in Figures 13 and 14 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 with track A in between, and creating a large number of vertical shafts 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 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. This is a method of excavating a tunnel while constructing a tunnel.

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 applicants of the present application have developed an underground passage construction method as described in Japanese Patent Publication No. 61-45034.

As shown in Figures 15 to 17, this construction method involves press-fitting a plurality of rectangular cross-sectional pipes b with friction cut members a arranged on their upper surfaces so that they are parallel to each other at the upper floor position of the planned underground tunnel. to form a pipe band c having a width approximately equal to the width of the upper floor, and then abutments d, d are built in the length direction of the pipe band c at the lower parts of both ends of this pipe band c, and these abutments d, After providing seats e along both end surfaces of the pipe band c on the upper surface of d, a ready-made upper floor member f is installed on the rear end surface of the pipe band c.
are brought into contact with each other, and in this state, the upper floor member is pressed by means such as a jack to remove the friction cut member a.
The pipe band c and the ground below the upper floor member are excavated using the seats e and e on both sides as guides while leaving the pipe band c in place.

However, in this method, the abutment d,
When constructing d, it is necessary to excavate the track section g, which necessitates temporarily supporting the track, slowing the train, and performing night work, which reduces work efficiency and limits work time. However, there was a problem that the construction period would be long.

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

(Means for Solving the Problems) In order to achieve the above object, the method for constructing an underground passage according to the present invention includes creating an appropriate interval in the width direction of the upper slab in the method for constructing an underground passage consisting of an upper deck slab and an abutment. Then, a plurality of pipes that are in contact with each other in a stacked state are press-fitted in the direction of the underground passage along at least the outer periphery of the cross section of the abutment part of the planned underground passage, and then a ready-made abutment is brought into contact with the rear end surface of this group of laminated pipes to form the abutment. It is characterized by replacing the laminated pipe group with the abutment and burying the abutment by press-fitting, and each step in constructing an underground passage involves forming a plurality of cross-sections with friction cut members arranged on the upper surface. A process of press-fitting rectangular pipes in parallel to 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, and placing appropriate intervals below this pipe band in the width direction of the pipe band. A step of press-fitting a plurality of pipes in contact with each other in a stacked state along at least the outer periphery of the cross section of the underpass abutment in the same direction as the pipe band, and a ready-made abutment is brought into contact with the rear end surface of the group of laminated pipes to form the abutment. a step of replacing the laminated pipe group with the abutment by press-fitting; and a step of abutting the front end of the ready-made underpass upper deck against the rear end of the pipe strip, and slidingly contacting the lower surfaces of both ends with the top end of the abutment; This method is characterized by comprising a step of replacing the upper deck with the pipe band by press-fitting the upper deck with the friction cut member left in place, and a step of excavating the ground below the pipe band.

(Function) Since the pipe belt is press-fitted into the ground at the upper floor of the planned underground passage and an abutment is formed on the lower side of the pipe belt, the underground passage can be constructed without excavating the ground above the pipe belt. , After press-fitting a plurality of pipes in contact with each other in a stacked state at least on the cross-sectional outer circumference of the planned underpass abutment in the direction of the underground passage, a pre-fabricated abutment is brought into contact with the rear end face of this group of laminated pipes and the abutment is press-fitted. Since the pipe group and the abutment are replaced, the abutment can be accurately constructed at a predetermined position, and there is no need to excavate the ground when press-fitting the abutment, and the abutment can be easily buried following the laminated pipe.

Also, when replacing the pipe belt with the underpass upper slab,
Since the friction cut member installed on the top surface of the pipe belt is left in the ground, the work can be carried out without moving the overburden earth and sand, and therefore without adversely affecting the rails, etc. on the ground side. At the same time, its replacement can be performed accurately and easily.Furthermore, it is possible to construct the upper slab even if the height of the overburden is reduced, so it is possible to obtain an underground passage with a short approach, and the lower surface of the pipe belt By press-fitting multiple rows of abutments along the bridge, multi-span underground passages can be easily constructed.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings. First, as shown in FIG. and excavate. Next, a pipe 3 having a rectangular cross section is horizontally press-fitted from the starting shaft 11 toward the reaching shaft 12.

A friction cut member 4 made of a strip-shaped steel plate is placed on the upper surface of the pipe 3, and only its tip is fixed to the tip of the friction cut member 4 by welding or the like (see Fig. 9 and 10th
(see figure).

The pipe 3 is press-fitted by inserting an auger (not shown) into the auger and excavating the ground, and one pipe 3 is press-fitted and buried straight between the starting shaft 11 and the destination shaft 12. .

Furthermore, the engaging protrusions 3a or 3b protrudingly provided on the opposite side of the pipe 3 to be press-fitted are added to the engaging protrusions 3a and 3b (see Fig. 9) provided on both sides of the pipe 3 that has already been press-fitted. The pipes 3 are successively buried in the horizontal direction while engaging the
A pipe belt 2 is formed over the entire width of the planned underground passage.

After forming the pipe band 2 in this way, as shown in FIG.
2 is also deeply excavated, and then a plurality of pipes 5 are placed on both sides of the lower surface of the pipe band 2 in the same direction as in the pipe band 2, so that adjacent pipes 5, 5 are press-fitted one after another while making sliding contact with each other, and these pipes 5, 5 form a stacked pipe band group 8 whose cross-sectional shape is the same as that of the bridge abutment 6 of the planned underground passage.

In addition, it is desirable that a friction cut member 9 is disposed on the surface of the pipe 5 in contact with the ground in this stacked pipe group 8, similarly to each pipe 3 of the pipe band 2. In this case, the friction cut member 9 The tip of the cut member 9 is fixed to the tip of the pipe 5.

The stacked state of the pipe group 8 may be as shown in FIG.
As shown in the figure, earth and sand may be press-fitted only along the outer periphery of the planned abutment 6 so that it exists inside.

After constructing the laminated pipe group 8 having the same cross-sectional shape as the abutment 6 at the bottom of both sides of the pipe body 2, the abutments 6, 6 are installed in the starting shaft 11, and the front surfaces of these abutments 6, 6 are connected to the laminated pipe group 8. After abutting each on the rear end surface, press fit.

At this time, the rear end of the pipe band 2 in contact with the upper surface of the abutment 6 is anchored to the shaft reaction force receiving part so that it does not move forward with the propulsion of the abutment 6, and the tip of the friction cut member 9 of the pipe group 8 is At the same time, the rear end of the friction cut member 9 is anchored to the shaft reaction force receiving part.

The abutment 6 may be pressed in from the starting shaft 11 side with a jack 13 as shown in the figure, or by an appropriate pulling force inserted through the pipes 5 of the pipe group 8 from the arrival shaft 12 side. This may also be done by traction by a member (not shown).

The abutment 6 is of a fixed length, and the next abutment 6 follows the rear end of the preceding abutment 6, and the upper surface of the abutment 6 is slid against the lower surface of the pipe band 2 while being pressed against the pipe band 2. Using the advanced pipe group 8 and the remaining friction cut member 9 as guides, the pipes are sequentially press-fitted toward the reaching vertical shaft 12.

Through this press-fitting, the pipe group 8 is pushed out toward the arrival shaft 12, but when a suitable length portion protrudes into the arrival shaft 12, the rear end of the projection is cut and removed each time, and the final pipe group 8 is The pipe group 8 and the plurality of bridge abutments 6 arranged in series are replaced.

In this case, as shown in FIG. 5, if there is earth and sand inside the pipe group 8, as the pipe group 8 is pushed out, this earth and sand is also pushed out toward the reaching shaft 12 while being contained inside. It can be eliminated by removing the pipe.

FIG. 6 is a sectional view showing a state in which abutments 6 are buried in the lower parts of both sides of the pipe band 2 between the starting shaft 11 and the arrival shaft 12, and the cross-sectional shape of the abutment 6 is as follows.
As shown in the figure, it may not be solid or may be hollow, and may also have a desired cross-sectional shape such as a box shape, trapezoid shape, or inverted T-shape.

Next, as shown in FIG. 3, a pedestal 15 is installed on the starting shaft 11 side, and an anchor 16 is attached to the rear end of the friction cut member 4 placed on the upper surface of the pipe band 2 to the shaft reaction force receiving part. After fixing the friction cut member 4 from the tip of the pipe 3 at the frontmost end of the pipe band 2 by cutting or the like, the pipe band 2 has a height substantially equal to that of the pipe 3 and a width thereof. A ready-made upper floor plate 7 approximately equal to Press fit by doing this.

The upper deck 7 is press-fitted with its lower surfaces on both sides slidingly in contact with the upper surfaces of the abutments 6, 6, using the upper surfaces as guides, and by press-fitting the upper deck 7, the pipe 3 at the front end of the pipe band 2 reaches the vertical shaft. 12 side, and the protruding rear end of the pipe 3 is cut off and removed.

At this time, since the friction cut member 4 is fixed, the earth and sand on the friction cut member 4 will not move at all even if the upper slab 7 moves forward.

In this way, the pipe band 2 and the upper deck 7 are replaced by repeatedly press-fitting the upper deck 7 and cutting out the pipe portion of the pipe band 2 protruding toward the reaching shaft 12 side.

After construction of the upper deck 7, as shown in Fig. 8, the earth and sand surrounded by the lower surface of the upper deck 7 and the adjacent abutments 6, 6 is excavated and removed, and the flooring material 18 is laid or concrete is poured. Underpass 19 formed by
It is to build.

In the above embodiment, after the pipe band 2 is press-fitted, the laminated pipe group 8 is press-fitted, and then the abutment 6 and the upper deck 7 are sequentially press-fitted and replaced. However, after the laminated pipe group 8 is press-fitted, The pipe band 2 may be press-fitted into the pipe band 2. Furthermore, the pipe band 2 may be formed by press-fitting after the laminated pipe group 8 is press-fitted and the abutment 6 is press-fitted and replaced. Further, the underground passage 19 may be formed by press-fitting the pipe band 2 and before constructing the abutment 6 while excavating the ground below the pipe band 2. In short, each process in the above embodiment is performed in the following order. It may be the other way around.

Furthermore, when press-fitting the abutment 6 before press-fitting the pipe band 2, a friction cut member 9 is arranged on the upper surface of the uppermost pipe 5 of the stacked pipe group 8 in the same manner as the pipe band 2. This is desirable.

In addition, the pipes 3 and 5 forming the pipe band 2 and the laminated pipe group 8 and the friction cut members 4 and 9 along the pipes 3 and 5 are short ones, so that one pipe 3 and 5 can be separated. When the press-fitting is completed, the next pipes 3 and 5 may be connected to the rear end and press-fitted, and this operation may be repeated to bury the pipes straight between the starting shaft 11 and the reaching shaft 12. In this case, Only the front end pipes 3 and 5 have the front ends of friction cut members 4 and 9 fixed to their tips, and the following pipes 3 and 5 have friction cut members 4 and 9 attached in the length direction. It is sufficient if it is attached so that it can slide.

Similarly, the upper floor slab 7 may be divided into a plurality of short pieces in the length direction, and may be sequentially press-fitted using a plurality of short pieces.

11 and 12 show another embodiment of the present invention, in which the pipes 3A, 3A sliding on the upper surface of the bridge No. 6, 6 are set in advance at a height higher than the other pipes 3 of the pipe band 2. Use a small shape with a low
After the friction cut member 4 on the upper surface is press-fitted so that it is flush with the friction cut member 4 of the other pipe 3, it is laminated on the lower surface side of the small pipes 3A, 3A as in the previous embodiment. The pipe groups 8, 8 are press-fitted and the pipe groups 8, 8 are replaced with the bridge abutments 6, 6.

After constructing the abutments 6, 6 along the entire length of both sides of the pipe band 2, the lower surfaces of both sides of the upper deck slab 7 having the same thickness as the height of the small pipe 3A are brought into sliding contact with the upper surfaces of the abutments 6, 6. By press-fitting in the same manner as in the previous embodiment, the upper deck 7 can be installed while forming a gap 20 between the lower surface of the upper deck 7 and the ground, as shown in FIG.

In this way, there is a gap 20 between the lower surface of the upper deck 7 and the ground.
When the upper deck 7 and the pipe band 2 are replaced while forming the upper deck 7, the pressing force of the upper deck 7 is reduced, and the pipe band 2 is undulated, and dirt is deposited within the cross section of the upper deck to be press-fitted. Also, the earth and sand in the undulating areas are separated into voids 20
Since it can be pushed into the section, the earth and sand can be press-fitted together with the pipe band 2 without being pushed forward.

In the above embodiments, the abutments 6, 6 are press-fitted into both sides of the pipe band 2, but they may also be press-fitted in multiple rows in the middle. By press-fitting, multi-span underground passages can be constructed.

In each of the embodiments described above, the upper deck 7 may be made of reinforced concrete, steel-framed concrete, or only a steel frame, as long as it is a plate-like material with sufficient strength.

Further, the hollow part of the abutment part 6 may be filled with earth and sand, or may be left as is and used for humanitarian purposes.

(Effects of the Invention) As described above, according to the underground passage construction method according to the present invention, a plurality of rectangular cross-section pipes each having a friction cut member arranged on the upper surface are press-fitted in parallel to the upper floor position of the planned underground passage. A pipe band with a width approximately equal to the width is formed, and the abutment is press-fitted and the underground passage is constructed in the ground below this pipe band, so the underground passage can be constructed without excavating the ground above the pipe band. At this time, a plurality of pipes are press-fitted in advance in the direction of the underground passage below the pipe belt, with appropriate intervals in the width direction of the pipe belt, and in contact with each other in a stacked state along at least the outer periphery of the cross section of the planned underpass abutment. Since the abutment is press-fitted by abutting the rear end surface of this laminated pipe group, the abutment is placed on the lower surface of the pipe band or
It is guided by the preceding pipe group and can be easily press-fitted with high precision.

Furthermore, when replacing the pipe belt with the underpass upper deck, the friction cut member placed on the top surface of the pipe belt is left in the ground, so the overburden soil does not move, and therefore the ground The work can be performed without adversely affecting the rails on the front side, and the replacement can be performed accurately and easily.

In addition, since it is possible to construct the upper deck even if the height of the overburdening soil in the upper part of the pipe strip is reduced, it is possible to obtain an underground passage with a short approach, and it is possible to use an upper deck that is thinner than the pipe strip. Therefore, the upper deck can be easily erected by reducing friction with the earth and sand, and by press-fitting multiple rows of abutments along the lower surface of the pipe belt, multi-span underground passages can be easily constructed. It is something that can be done.

[Brief explanation of drawings]

Figures 1 to 12 show examples of the present invention, Figures 1 to 3 are simplified vertical sectional side views showing the construction order, and Figure 4 is a simplified view of the pipe band and pipe group in the constructed state. Figure 5 is a simplified vertical front view showing another arrangement of the pipe group, Figure 6 is a simplified vertical front view with the abutments installed, and Figure 7 is a simplified front view with the upper deck installed. Figure 8 is a vertical front view of the constructed underground passage, Figure 9 is a vertical front view of the pipe, Figure 10 is a vertical side view of the pipe, and Figure 11 is a vertical front view of the pipe.
Figure 12 is a simplified vertical front view showing another embodiment of the construction of the upper deck; Figure 12 is a simplified vertical front view with the upper deck installed; Figure 13 is a vertical side view showing a conventional underground passage construction method; The figure is a longitudinal sectional front view thereof, and FIGS. 15 to 17 are longitudinal sectional front views showing the order of implementation of the conventional upper deck erection method. 2... Pipe band, 3, 5... Pipe, 4, 9...
...Friction cut member, 6... Bridge abutment, 7...
Upper floor slab, 8... Laminated pipe group, 11... Starting shaft, 12... Arrival shaft.

Claims (1)

[Scope of Claims] 1. In a method of constructing an underpass consisting of an upper deck and an abutment, the upper deck is in contact with each other in a stacked state along at least the cross-sectional outer periphery of the abutment part of the planned underpass, with an appropriate interval in the width direction of the upper deck. After press-fitting a plurality of pipes in the direction of the underground passage, a ready-made abutment is brought into contact with the rear end face of the laminated pipe group and the abutment is press-fitted, thereby replacing the laminated pipe group and the abutment and burying the abutment. An underground passage construction method characterized by: 2. A step of press-fitting a plurality of rectangular cross-sectional pipes each having a friction cut member on the upper surface in parallel to the upper floor position of the planned underground passage to form a pipe band having a width approximately equal to the upper floor width, and A step of press-fitting a plurality of pipes in a stacked state along at least the cross-sectional outer periphery of the planned underpass abutment at appropriate intervals in the width direction of the pipe strip below in the same direction as the pipe strip; and a group of the stacked pipes. a step of replacing the stacked pipe group and the abutment by abutting a ready-made abutment against the rear end face and press-fitting the abutment;
By bringing the front end of the ready-made underpass upper deck into contact with the rear end of the pipe band, and slidingly contacting the lower surfaces of both ends with the top end of the abutment, press-fitting the upper deck while leaving the friction cut member in place. A method for constructing an underground passage comprising the steps of replacing the upper slab with a pipe band and excavating the ground below the pipe band. 3. Claims characterized in that a friction cut member is disposed on the surface of at least the uppermost pipe of a group of laminated pipes, and the abutment is replaced with the group of laminated pipes while leaving the friction cut member in place. The method for constructing an underground passage according to item 1 or 2. 4. The method for constructing an underground passage according to claim 1, 2, or 3, wherein the abutment is a solid ready-made member.