JPH049919B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for constructing an upper deck of an underpass when constructing an underpass that crosses under railroad tracks or under roads.

(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 railway crossing accidents and road traffic congestion, and for this purpose construction as shown in Figures 10 and 11 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 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 the steel pipes C in close parallel to each other, shoring 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 D.

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 12 to 14, 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 forming a pipe band by press-fitting a plurality of rectangular cross-sectional pipes in parallel to the upper floor of the planned underground passage, the bridge abutment section with a receiving member attached to the upper part is attached so that the upper surface of the receiving member is attached to the pipe band. While leaving the friction cut members in the longitudinal direction of the pipe band on the rear end surfaces of both sides of the pipe band so as to be in contact with the lower surface of the friction cut members, push out the pipes in the pipe band and move the bridge abutments over the entire length of the planned underground passage. Then, with the front end of the underpass upper deck in contact with the rear end of the pipe band between the abutments, and the front ends of both ends thereof in contact with the rear ends of the receiving members attached to the abutments, This method is characterized in that the upper deck is press-fitted with the friction cut member left in place, thereby replacing the upper deck, the pipe band, and the receiving member, and constructing the upper deck between the abutments.

(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. 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 a plurality of rows of abutments along the bridge, a multi-span underground passage can be easily constructed.

Furthermore, by forming the depth of the seat provided in the abutment part to be smaller than the height (thickness) of the pipe band and using the upper slab of approximately the same thickness as the depth of the seat,
When the upper deck is press-fitted, a gap is formed between the ground of the upper deck, so the pressing force of the upper deck is reduced, and the press-fitting operation can be easily performed.

(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 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). ).

The pipe 3 is press-fitted by inserting an auger (not shown) inside the pipe 3 and excavating the ground. 8), the pipes 3 to be press-fitted are successively buried in the horizontal direction while engaging the engaging protrusions 3a or 3b protruding from the opposite side surfaces of the pipes 3, as shown in FIG. Next, a pipe belt 2 will be formed across the entire width of the planned underground passage. In addition, pipe zone 2 in the outward direction of the planned underground passage
A conventional pipe roof 5 is press-fitted on both sides of the roof.

After forming the pipe band 2 in this way, as shown in FIG. After the reaching shaft 12 is also deeply excavated, the abutments 6, 6 are installed in the starting shaft 11, facing both sides of the rear end of the pipe band 2.

A receiving seat 9 having an L-shaped cross section and a depth smaller than the height of the pipe band 2 is formed over the entire length at the upper end corners of these adjacent abutments 6, 6. A receiving member 10 made of a small rectangular pipe having approximately the same height as the depth of the receiving seat 9 on the seat 9.
The receiving member 10 is placed over its entire length and fitted so that the space in the receiving seat 9 is filled with the receiving member 10.

Note that the catch seat 9 having an L-shaped cross section does not have an L-shaped cross section when the width of the catch seat 9 is required to be the entire width of the abutment portion 6.
The entire width of the upper surface of the abutment section 6 serves as a catch seat.

Moreover, even if the receiving member 10 is not a rectangular pipe,
The solid member may be an I-shaped or H-shaped member, and in short, any member that maintains the distance between the upper surface of the abutment and the friction cut member 4 may be used.

The abutments 6, 6 thus formed are press-fitted from the starting shaft 11 so that their upper surfaces and the upper surface of the receiving member 10 are in sliding contact with the lower surface of the friction cut member 4. Only the abutment portions 6a, 6a are provided with a cutting edge 6b integrally formed on the tip surface thereof, and the catch plate 9 is used.
The tip of the receiving member 10 is fixed to the tip of the receiving member 10 by suitable fixing means such as a bolt. Further, the rear end of the friction cut member 4 placed on the upper end of the pipe band 2 is fixed to the shaft reaction force receiving part with an anchor 16, and the pipe 3 at the abutment part 6 position is fixed.
The fixation of the friction cut member 4 is released from the tip by cutting or the like.

After making this condition, the bridge abutments 6a, 6a
When the upper front end surface of the pipe band 2 and the front end surface of the receiving member 10 are brought into contact with the rear end surfaces of the pipes 3 on both sides of the pipe band 2 and press-fitted in the length direction of the pipe band 2, the pipes 3 on both sides of the pipe band 2 are connected to the abutment part and Since it is pressed by the receiving member 10 and its front end is pushed out into the reaching shaft 12, the pipe 3 protruding into the reaching shaft 12 is cut off and removed.

When the first abutment parts 6a, 6a are press-fitted into the ground in this way, the next abutment parts 6, 6 and the receiving member 10 are brought into contact with the rear end faces and press-fitted. A series of abutments 6, 6...6 are provided on both sides of the pipe band 2 between the reaching shafts 12.
And the receiving members 10, 10...10 are buried. In this case, 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 abutment section 6 and the receiving member 10 move forward.

Note that the abutment portion 6 may be press-fitted by pressing it from the starting shaft 11 side with a jack 13 as shown in the figure, or by pressing it with a suitable traction member (not shown) from the reaching shaft 12 side. This may also be done by towing it. Also, along with press-fitting, the abutment part 6
It moves forward while excavating and discharging the excavated earth and sand using the hollow interiors that communicate with each other. At this time, the pipe roof 5 prevents the collapse of earth and sand on both outer sides of the pipe belt 2 due to the excavation of the abutment part 6.

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 as described above, the rear end of the friction cut member 4 placed on the upper end of the pipe band 2 is placed on the shaft to receive the shaft reaction force. Anchors 16 are fixed to the abutment sections 6 and 6, and the friction cut member 4 is unfixed from the tip of the pipe 3 of the pipe band 2 between the abutment sections 6 and 6 by cutting or the like, and The fixation of the receiving member 10 to the tip of the receiving seat 9 of 6 is released.

Thereafter, a ready-made upper floor slab 7 having a thickness substantially equal to the height of the receiving member 10 and a width substantially equal to the width between the outer surfaces of the receiving members of the left and right abutments 6, 6 is attached to the pipe band 2.
The rear ends of the receiving members 10 on both sides are brought into contact with each other, and the rear end surfaces of the upper deck 7 are pressed by jacks 17 placed on the frame 15, or the reaching vertical shaft 1
It is press-fitted by pulling it through a PC wire etc. inserted into the inside of the pipe 3 from the 2 side.

The upper floor slab 7 has its upper surface in sliding contact with the lower surface of the friction cut member 4, and its both sides are in contact with the abutment portions 6, 6.
The pipe 3 at the front end of the pipe band 2 and the receiving member 1 are press-fitted by using the seats 9, 9 as guides while slidingly in contact with the seats 9, 9 of the pipe band 2.
0 protrudes toward the reaching shaft 12 side, and its protruding rear end 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 upper deck 7 is press-fitted, the pipe section of the pipe band 2 protruding toward the reaching shaft 12 side, and the receiving member 10
This process is repeated to replace the pipe band 2 including the receiving member 10 with the upper slab 7.

At the time of this replacement, since the upper deck 7 that comes into sliding contact with the lower surface of the friction cut member 4 is formed thinner than the height of the pipe band 2, the abutment part 6,
A gap 20 is formed between the upper deck 7 and the ground when the upper deck 7 is press-fitted while being guided by the upper deck 7.
In addition, even if the pipe band 2 has undulations and there is earth and sand in the cross section of the upper deck to be press-fitted, the earth and sand in the undulations can be pushed into the gap 20, so the earth and sand can be pushed into the pipe band 2. It can also be press-fitted without pressing forward.

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 pipes 3 forming the pipe band 2 and the friction cut members 4 placed on the pipes 3 are of short length, and once the press-fitting of one pipe 3 is completed, the rear end of the next pipe 3 is cut. It is also possible to connect and press-fit the pipe and repeat this process to bury it straight between the starting shaft 11 and the reaching shaft 12. In this case, only the frontmost pipe 3 has a friction member at its tip. The tip of the cut member 4 may be fixed, and the friction cut member 4 may be attached to the following pipe 3 so as to be slidable in the length direction.

Similarly, it is desirable to use a plurality of short upper slabs 7 that are divided into a plurality of pieces in the length direction and press-fit them one after another.

In each of the above embodiments, 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 pipe roof 5 is press-fitted into both sides of the pipe band 2, it may be press-fitted downward along the outer surface of the abutment part from both sides of the pipe band 2, and the abutment part 6 is only fitted on both sides of the pipe band 2. Alternatively, a plurality of rows may be press-fitted in between, and in that case, a multi-span underground passage can be constructed by press-fitting the upper deck between each abutment section.

(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 member arranged on the upper surface are press-fitted in parallel at the upper floor position of a planned underpass. After the pipe band is formed, the pipe band is attached to the rear end surfaces of both sides of the pipe band by placing the abutment part, which receives the receiving member on the upper part, so that the upper surface of the receiving member is in contact with the lower surface of the friction cut member of the pipe band. The abutment section is buried over the entire length of the planned underpass while pushing out the pipes in the pipe band with the friction cut members left in place in the length direction, and then the front end of the underpass upper deck is inserted into the rear end of the pipe band between the abutment sections. By press-fitting the upper deck while leaving the friction cut member in contact with the front end of both ends thereof and the rear end of the receiving member attached to the abutment, the upper deck and the pipe are connected. Since this method is characterized by replacing the belt and the receiving member and constructing the upper deck between the abutment parts, the pipe belt can be installed using the receiving seat of the abutment part as a guide without excavating the ground above the pipe belt. The abutment part can be press-fitted smoothly in the length direction of the pipe belt, and when replacing the pipe band with the abutment part and the underpass upper deck, a friction cut member is installed on the top surface of the pipe band. Since the work is carried out with the soil remaining in the ground, the work can be carried out without moving the overburden earth and sand, and therefore without adversely affecting the rails on the ground side, and the replacement can be carried out accurately and easily.

Furthermore, since it is possible to construct the upper deck even if the height of the earth covering above the pipe belt is reduced, it is possible to obtain an underground passage with a short approach and to use an upper deck that is thinner than the pipe belt. Therefore, the upper slab can be easily erected by reducing friction with the earth and sand.

[Brief explanation of drawings]

Figures 1 to 9 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 with construction, Figure 7 is a vertical front view of the constructed underground passage, and Figure 8 is the pipe. 9 is a vertical side view of the same, FIG. 10 is a vertical side view showing the conventional underground passage construction method, and FIG. 11 is a vertical front view of the same.
FIG. 12 to FIG. 14 are longitudinal sectional front views showing the construction sequence of the conventional upper deck erection method. 2... Pipe band, 3... Pipe, 4... Friction cut member, 6... Bridge abutment, 7... Upper deck slab, 9... Seat, 10... Reception member, 11... Starting shaft, 12...Achievement shaft.

Claims (1)

[Claims] 1. After forming a pipe zone by press-fitting a plurality of rectangular cross-sectional pipes with friction cut members arranged on the upper surface in parallel at the upper floor position of the planned underground passage,
The abutment part, which has a receiving member attached to the upper part, is connected to the rear end surface of both sides of the pipe band so that the upper surface of the receiving member is in contact with the lower surface of the friction cut member of the pipe band in the longitudinal direction of the pipe band. The abutment section is buried over the entire length of the planned underpass while pushing out the pipes in the pipe band with the cut members left in place, and then the front end of the underpass upper deck is brought into contact with the rear end of the pipe band between the abutment sections, and both ends thereof are buried. By press-fitting the upper deck with the friction cut member left in place with its front end in contact with the rear end of the receiving member attached to the abutment, the upper deck, pipe band, and receiving member are connected. A method for constructing an underpass slab, characterized by replacing the bridge abutments with an upper slab between the abutments. 2. The method for constructing an upper deck of an underground passage according to claim 1, wherein the thickness of the receiving member is formed to be shallower than the height of the pipe band. 3. The method for constructing an underpass upper deck according to claim 1, wherein the thickness of the upper deck is substantially the same as the thickness of the receiving member. 4. The method for constructing an underpass upper deck according to claim 1 or 3, wherein the upper deck is made of a plurality of slab materials.