JPH049918B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for constructing an upper slab of an underpass when constructing an underpass that crosses under railroad 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. 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 below 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 22 to 24, 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 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.

SUMMARY OF THE INVENTION The present invention aims to solve these problems and provide a method for constructing an upper deck for an underpass, which can efficiently construct an upper deck for constructing an underground passage.

(Means for Solving the Problems) In order to achieve the above object, the method for constructing an underpass upper slab according to the present invention includes a method for constructing an underpass upper deck, in which a friction cut member is disposed on the upper surface, as shown in the drawings corresponding to the embodiments. After a plurality of pipes with a rectangular cross section are press-fitted in parallel into the upper floor position of the planned underground passage to form a pipe band with a width approximately equal to the upper floor width, an appropriate interval is created below this pipe band in the width direction of the pipe band. Press-fit and bury the abutment part of the underground passage in the length direction of the pipe belt while sliding the top surface on the lower surface of the pipe belt,
Next, the front end of the underpass upper deck is brought into contact with the rear end of the pipe strip, and the lower surfaces of both ends thereof are brought into sliding contact with the top end of the abutment section, and the upper deck is press-fitted while leaving the friction cut member in place. This is characterized in that the upper deck and the pipe band are replaced by.

(Operation) After the pipe belt is press-fitted into the ground at the upper floor of the planned underground passage, the bridge abutment is press-fitted along the lower surface of the pipe belt, so there is no need to excavate the ground above the pipe belt. , the abutment part can be press-fitted smoothly using the pipe band as a guide.

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. Furthermore, since it is possible to construct the upper slab even if the height is reduced to the level of the overburden, it is possible to obtain an underground passage with a short approach, and the lower surface of the pipe belt can be easily replaced. By press-fitting a plurality of rows of abutments along the bridge, a multi-span underground passage 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 short 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 top 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. 13). ).

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, on the engagement protrusions 3a and 3b (see Fig. 12) 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 engaging protrusions 3a or 3b protruding from the opposite side of the pipe 3 to be press-fitted, and as shown in Fig. 4, the width of the planned underground passage is determined. A pipe band 2 is formed over the entire width. Furthermore, conventional pipe roofs 5 are press-fitted on both sides of the pipe band 2 in the outward direction of the planned underground passage.

After forming the pipe band 2 in this way, as shown in FIG. 2, the starting shaft 11 is excavated deep enough to allow the installation of a hollow box-shaped ready-made bridge abutment 6, and the reaching shaft 12 is similarly excavated deeply. After that, the abutment part 6 is installed in the starting shaft 11, and the abutment part 6,
Press in.

Note that the most advanced abutment portion 6 is integrally provided with a cutting edge 6a on its tip surface.

The abutment portion 6 may be pressed in from the starting shaft 11 side using a jack 13 as shown in the figure, or from the reaching shaft 12 side by an appropriate pulling member (not shown). This may be done by towing.

The abutment part 6 is of a fixed length, and the next abutment part 6 follows the rear end of the preceding abutment part 6, and while the upper surface of the abutment part 6 is in sliding contact with the lower surface of the pipe band 2, the pipe band is 2 as a guide, they are sequentially press-fitted toward the reaching shaft 12, and are moved forward while excavating and discharging excavated earth and sand using the mutually communicating hollow interiors of the abutments 6. At this time, the bridge abutment 6
In order to prevent the pipe band 2 in contact with the upper surface from moving forward with the propulsion of the abutment part 6, the rear end is anchored to the shaft reaction force receiving part. Collapse of earth and sand is prevented by a pipe roof 5.

FIG. 5 is a sectional view showing a state in which abutment portions 6 are buried in the lower portions of both sides of the pipe band 2 between the starting shaft 11 and the reaching shaft 12.

Next, as shown in FIG. 3, a pedestal 15 is installed on the starting shaft 11 side, and an anchor 14 is attached to the rear end of the friction cut member 4 placed on the upper surface of the pipe band 2 at 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 using the upper surface as a guide while sliding its lower surfaces on both sides to the upper surfaces of the abutments 6, 6, and by press-fitting the upper deck 7, the pipe 3 at the front end of the pipe band 2 reaches. The pipe 3 protrudes toward the 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, even if the upper slab 7 moves forward, the earth and sand on the friction cut member 4 will not move at all.

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. 7, 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.

Note that the pipe 3 forming the pipe band 2 and the friction cut member 4 placed on the pipe 3 are of short length, and once one pipe 3 is press-fitted, the pipe 3 and the friction cut member 4 are connected. The members 4 may be connected and press-fitted afterward, and this operation may be repeated and buried in a straight line between the starting shaft 11 and the reaching shaft 12. In this case, only the pipe 3 at the front end is buried. The distal end of the friction cut member 4 may be fixed to the distal end, and the friction cut member 4 may be attached to the succeeding pipe 3 so as to be slidable in the length direction.

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

8 to 11 show an application example of the present invention, in which a wide pipe band 2 is press-fitted into the ground in the same manner as in the previous embodiment, and then the pipes are inserted at appropriate intervals in the width direction of the pipe band 2. Multiple rows of abutment parts 6, 6, 6 are press-fitted using the lower surface of the band 2 as a guide, and then,
After the upper deck 7 is press-fitted so as to be installed between the upper surfaces of the adjacent abutments 6 and 6 and replaced with the pipe band 2, the upper deck 7 is surrounded by the other surface of the upper deck 7 and the adjacent abutments 6, 6. The multi-span underground passage is constructed by excavating and removing the soil and laying the flooring material 18 or by pouring concrete.

Next, FIGS. 14 to 16 show another embodiment of the present invention, in which the abutments 6, 6 are press-fitted at an appropriate interval below the pipe band 2, as in the previous embodiment. However, as the upper floor slab 7 that replaces the pipe band 2, the width part of the lower surface of the upper floor slab 7, which has approximately the same thickness as the height of the pipe 3 constituting the pipe band 2, except for both ends, extends over the entire length. It is formed thin with a recess 8 provided therein.

If the upper deck 7 formed in this way is used, a gap 16 will be formed between the upper deck 7 and the ground when replacing the pipe strip 2, so the pressing force of the upper deck 7 will be reduced and the pipe strip 2 will have undulations. Even if there is earth and sand in the cross section of the upper slab to be press-fitted, the earth and sand in the undulating part can be pushed into the gap 16,
The earth and sand can be press-fitted together with the pipe band 2 without being forced forward.

17 to 19 show another embodiment for obtaining a gap 16 between the lower surface of the upper deck 7 and the ground, in which a depth is provided at the upper end corners of the adjacent abutments 6, 6. A cross section L smaller than the height of the pipe band 2
A catch seat 9 is formed in a letter shape over the entire length, and small rectangular pipes 10 having the same height as the depth of the catch seat 9 are used as pipes on both sides of the pipe band 2 corresponding to the catch seat 9. , and is press-fitted so that its upper surface is flush with the upper surface of the pipe band 2.

After construction is completed in this manner, when the abutment section 6 is press-fitted so that the small pipe 10 is in contact with its seat 9, the lower surface of the small pipe 10 comes into sliding contact with the bottom surface of the seat 9 as the abutment section 6 moves forward. A pipe 3 or 10 disposed outward from the small pipe 10
is pushed forward by the front surface of the outer upper end of the abutment part 6, protrudes toward the reaching shaft side, and is removed.

After constructing the abutment part 6 along the entire length of both sides of the pipe band 2 in this way, the upper deck 7 is constructed to have a thickness approximately equal to the depth of the seat 9 of the abutment part 6, and the lower surfaces of both sides thereof 19, the upper deck 7 can be constructed while forming a gap 16 between the lower surface of the upper deck 7 and the ground, as shown in FIG. It is possible.

In addition, when the width of the upper deck 7 is the width between the outer sides of the abutment parts 6, 6, the small pipe 1 is not made to have an L-shaped cross section, but the small pipe 1 is made so that the entire width of the upper surface of the abutment part is the catch 9.
0 is press-fitted into the entire width of the abutment part 6.

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.

Further, although the pipes 5 are press-fitted into both sides of the pipe band 2, they may be press-fitted downward from both sides of the pipe band 2 along the outer surface of the abutment part.

(Effects of the Invention) As described above, according to the method for constructing an underpass upper deck according to the present invention, a plurality of rectangular cross-sectional pipes each having a friction cut member arranged on the upper surface are press-fitted in parallel at the upper floor position of a planned underpass. After forming a pipe band with a width approximately equal to the width of the upper floor, the underpass is connected to the abutment part of the underpass by sliding the upper surface of the underside to the lower surface of the pipe band, leaving an appropriate interval in the width direction of the pipe band below this pipe band. Then, the front end of the underpass upper slab is brought into contact with the rear end of the pipe belt, and the lower surfaces of both sides are brought into sliding contact with the top end of the abutment part. Since the upper deck and pipe strip are replaced by press-fitting the friction cut members in place, the abutment can be smoothly built using the pipe strip as a guide without excavating the ground above the pipe strip. It can be press-fitted, and furthermore, when replacing the pipe strip with the underpass upper slab, the friction cut member placed on the top of the pipe strip is left in the ground, so there is no earth cover. without soil movement,
Therefore, the work can be carried out without adversely affecting the rails on the ground side, and the replacement can be carried out 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 with less friction with the earth and sand, and multi-span underground passages can be easily constructed by press-fitting multiple rows of abutments along the lower surface of the pipe belt. It is something that can be done.

[Brief explanation of drawings]

Figures 1 to 19 show examples of the present invention, Figures 1 to 3 are simplified vertical side views showing the construction order, and Figure 4 is a simplified vertical front view of the pipe band after it has been constructed. , Figure 5 is a simplified vertical front view of the bridge abutments with construction, Figure 6 is a simplified vertical front view of the upper deck installed, Figure 7 is a vertical front view of the constructed underground passage, and Figures 8 to 8. Figure 11 is a vertical front view showing the construction order of a multi-span underground passage, Figure 12 is a vertical front view of the pipe, Figure 13 is a vertical side view thereof, and Figure 1
4 to 16 are longitudinal sectional front views showing the construction order of another embodiment of the upper deck erection method, and FIGS. 17 to 1
Fig. 9 is a longitudinal sectional front view showing the construction order of yet another embodiment of the upper deck erection method, Fig. 20 is a longitudinal sectional side view showing the conventional underground passage construction method, Fig. 21 is a longitudinal sectional front view thereof, and Figs. FIG. 24 is a longitudinal sectional front view showing the construction sequence of the conventional upper deck erection method. 2... Pipe band, 3... Pipe, 4... Friction cut member, 6... Bridge abutment, 7... Top slab, 8... Recess, 9... Seat, 10... Small pipe, 11 ...Starting shaft, 12... Arrival shaft.

Claims (1)

[Claims] 1. After press-fitting a plurality of rectangular cross-sectional pipes with friction cut members on their upper surfaces in parallel at the upper floor position of the planned underground passage to form a pipe band with a width approximately equal to the upper floor width. , press-fit and bury the abutments of the underground passage in the lengthwise direction of the pipe band with their upper surfaces slidingly in contact with the lower surface of the pipe band, leaving appropriate intervals in the width direction of the pipe band below this pipe band, and then burying them in the length direction of the pipe band, By press-fitting the upper deck while leaving the friction cut member in place while the front end of the underpass upper deck is brought into contact with the rear end of the pipe band and the lower surfaces of both ends are slid into contact with the top end of the abutment section. A method for constructing an underpass upper deck comprising replacing the upper deck with a pipe band. 2. The method for constructing an underpass upper deck according to claim 1, characterized in that a recess is provided along the entire length of the lower surface of the underpass upper deck between adjacent underpass abutments. 3. A small pipe that is lower than the height of the pipe belt between the underpass abutments and whose upper surface is flush with the top surface of the pipe belt is installed at the top of the adjacent underpass abutment. At the same time, the upper deck slab having a thickness substantially the same as the height of the small pipe is configured to be moved forward while slidingly contacting the upper surface of an adjacent underpass abutment part. Method. 4. The method for constructing an underpass upper deck according to claim 1, 2, or 3, wherein the upper deck is made of a plurality of slab materials.