JPH06105025B2 - Reconstruction method for existing underground structures - Google Patents

Description

[Detailed Description of the Invention] [Field of industrial application] The present invention relates to a method for reconstructing an existing underground structure in which a structure such as an existing underground passage provided under a rail or a road is replaced with a new structure. Is.

[Conventional technology]

When it is necessary to reconstruct an underpass, etc., which is installed under a railroad track so as to cross the railroad for many years, in the conventional construction method, first, support piles are struck on both sides of the underpass and at the same time at night. After removing the ground under the rail on the underpass and laying the rail between the upper ends of the support piles and temporarily receiving it with a supported girder, destroy the existing underpass and build a new underground Is being done.

[Problems to be Solved by the Invention]

However, according to such a method of reconstructing an underpass,
The rail is temporarily received by a temporary support girder (construction girder), but it cannot be constructed unless there is a cover that can install a temporary support girder between the rail and the upper floor of the underpass. However, there is a problem that the train must pass slowly when passing through the construction site.

In addition, it takes a lot of time to construct temporary girders, destroy existing existing underpasses, construct new underpasses, etc., resulting in a significantly longer construction period. As the position becomes deeper, the underpass must be constructed deeper by that amount, so that it becomes necessary to form a steep slope for approaching the underpass or lengthen the slope portion.

An object of the present invention is to provide a method for reconstructing an existing underground structure that can solve such problems.

[Means for Solving the Problems]

In order to achieve the above object, the method for reconstructing an existing underground structure according to the present invention is composed of an upper floor and a side wall, and in an existing underground structure in which at least an edge between the upper floor and the side wall is cut,
At least on the upper surface of the upper floor, a plurality of elongated plates are laid in parallel in the longitudinal direction of the existing underground structure, and the ends of these elongated plates are fixed to a fixed point, and the ready-made structure is provided on the rear end side of the existing underground structure. After the front end of the structure is made to follow the top end of the structure, the side wall of the existing underground structure is removed by appropriate means such as destruction, and the ready-made structure is installed in parallel with the upper floor of the existing underground structure. It is characterized in that the lower surface of the plate is used as a guide surface to move forward to replace the existing underground structure with the existing structure.

[Action]

After carrying out the work of laying the slender plates in parallel on the upper floor of the existing underground structure, the front end of the existing underground structure is brought into contact with the rear end surface of the existing underground structure, and both of them are propelled or towed. Since it replaces the structure, the existing underground structure can be reconstructed in a short period of time, and the train does not need to slow down as it does not require temporary girders. Yes, further, the replacement of the existing underground structure and the ready-made structure is performed while sliding these structures to the elongated plate as a fixed elongated plate guide,
Despite the movement of the structure, the ground on the slender plate does not move at all, so it does not hinder the progress of trains,
Moreover, the structure can be displaced while sliding on the elongated plate by a relatively small-scale propulsion or traction means.

Further, since the upper floor of the existing underground structure is cut off with respect to the side wall in advance, the existing structure is moved forward with the upper floor of the existing underground structure while removing the side wall of the existing underground structure by appropriate means such as destruction. This makes it easier to replace the existing underground structure with the existing structure.

Furthermore, on the side ground of the existing underground structure, a pipe with an elongated plate placed on the surface in contact with the ground is laid in parallel and then the elongated plate is fixed to the ground side, and then the existing underground If the front end face of a prefabricated structure that is larger than the structure is directly or indirectly abutted to the rear end of the parallel pipe to advance the prefabricated structure, the fixed elongated plate serves as a guide, and In addition, the ready-made structure with the widened structure can be easily replaced with the existing underground structure.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings.
When reconstructing an existing underground structure (2) that has been constructed below the rail (1), first, one side of the rail (1) is set as the starting side (3) and the arrival side of the other side. (4) On the upper surface of the upper floor (2a) of the existing underground structure (2) extending over a plurality of elongated steel plates (5), (5), ... Lay them in parallel with each other in contact.

In the laying work of this elongated plate (5), after excavating the ground under the rail (1) to expose the upper floor (2a) of the existing underground structure (2), and laying it on the upper floor (2a), It may be carried out by backfilling the ground, or the ground may be penetrated as it is from the starting side (3) to the reaching side (4) on the upper floor (2a) of the existing underground structure (2). Slender plate (5)
You may perform by pressing in (5).

This laying method by press-fitting, as shown in FIGS.
A steel pipe (6) having a rectangular cross section, in which the elongated plate (5) having the same planar shape as the surface is placed on the entire one surface and the tip of the elongated plate (5) is fixed to the tip by welding or the like. ) Is used to attach an elongated plate (5) to an existing underground structure (2)
An auger (not shown) is inserted into the pipe (6) so that the pipe (6) faces the upper floor (2a) side, and the ground is excavated to penetrate from the starting side (3) to the reaching side. One rectangular vipe (6) is the upper floor (2a) of the existing underground structure (2)
Engagement ridges (6a) (6b) provided on both sides of this rectangular pipe (6) in the lengthwise direction when laid in a penetrating state above
While engaging with the engaging ridges (6a) or (6b) protruding from the opposite side surfaces of the next rectangular hype (6) to be press-fitted, the operation is repeated, and this work is repeated. A group of rectangular pipes is formed on the upper floor (2a) of the existing underground structure (2) by the rectangular pipes (5), (5), ... (5). After that, the tip of the elongated plate (5) is separated from the tip of each rectangular pipe (6), and only the rectangular pipe (6) is pulled out to form the elongated plate (5) on the upper floor of the existing underground structure (2) ( 2a) Install in parallel on top. At this time, earth and sand are appropriately filled and buried in the voids formed after the rectangular pipe (6) is extracted.

Further, as another laying method of the elongated plate (5), the ground on the upper floor (2a) of the existing underground structure (2) is bored by a boring machine along the length direction of the upper floor (2a). Insert the wire into the mark, connect the elongated plate (5) to the rear end of the wire, and pull the wire from the reaching side (4) to draw the elongated plate (5).
May be arranged on the upper floor (2a) of the existing underground structure (2).

After laying the elongated plate (5) on the upper floor (2a) of the existing underground structure (2) in this way, the reaction force is received on the foundation material (7) fixed to the ground surface of the starting side (3). The wall member (8) is erected. The reaction force receiving wall member (8) may be fixed to the base material (7) or may be attached so as to be movable in the press-fitting direction.

Furthermore, as shown in FIG. 5, a connecting frame (9) made of H-shaped steel or the like is arranged along the upper side of the elongated plate (5) protruding toward the starting side (3) so as to be in contact with the ground. Then, the rear end of the elongated plate (5) is integrally fixed to the connecting frame (9) by an appropriate means such as welding, and the connecting frame (9) and the reaction force receiving wall member (8) are anchored or the like. Connect with the connecting material (10).

On the other hand, a fixing frame (11) made of reinforced concrete or steel is arranged as shown in FIG. 6 along the upper side of all the elongated plates (5) protruding to the arrival side (4), and the fixing frame is formed. (1
The tip of each elongated plate (5) is integrally fixed to 1) by welding or the like, and the fixing frame (11) is brought into close contact with and supported by the end face of the ground.

In addition, the reaction force receiving wall member (8) is contacted with a rear end surface of the existing underground structure (13) which has a fixed length and has a substantially same cross-section as the existing underground structure (2) to be buried. A plurality of propulsion jacks (12) are attached to the reaction force receiving surface of (1), and a push frame (14) is interposed between the propulsion jack (12) and the rear end surface of the ready-made structure (13).

After arranging in this way, the propulsion jack (12) is actuated to extend the ready-made structure (13) through the push frame (14) on the upper surface of the upper floor (13a) of the elongated plate (5). Sliding contact with the underside of the building, press-fitted while being guided, and existing underground structure (2)
In response to the press-fitting, the upper floor (2a) is slidably contacted with the lower surface of the elongated plate (5) and pushed out to the arrival side (4) while being guided.

At this time, the press-fitting resistance is large due to the adhesion of the existing underground structure (2) to the ground, and it is difficult to push the existing underground structure (2) with the propulsion force of the propulsion jack (12). The elongated plate (5) is further provided along the outer surface of the side wall of the existing underground structure (2), or the existing structure (13) is press-fitted while gradually breaking the rear end of the side wall of the existing underground structure (2). Reduce resistance.

When the prefabricated structure (13) is press-fitted by a certain length, the propulsion jack (12) is contracted, and the next push frame (14) is additionally inserted to press-fit the prefabricated structure (13) again. The existing underground structure (2) is pushed out to the arrival side (4) accordingly.

As described above, when these structures (2) and (13) are moved forward by the pushing of the propulsion jack (12), the reaction force is received by the reaction force receiving wall member (8) and the action force thereof is applied. The reaction force receiving wall member (8) tends to move rearward, but the reaction force receiving wall member (8) is connected to the rear end of the elongated plate (5) by the connecting member (10).
Since the front end of the elongated plate (5) is connected to the fixing frame (11) pressed against the end surface of the ground on the arrival side (4), the elongated plate (5) is connected to the fixing plate (5). Due to the frictional force between the outer surface and the ground and the pressure of the ground against the fixing frame (11), the reaction force receiving wall member (8) reliably receives the reaction force in a state where it is arranged at a fixed position.

When the press-fitting of the ready-made structure (13) of a fixed length is completed in this way, next, the ready-made structure (13) of a fixed length to be embedded next is connected to the rear end surface of the ready-made structure (13). The rear end of this ready-made structure (13) is received by the push frame (14) on the starting side (3).

In this state, the propulsion jack (12) is actuated, and in the same manner as described above, the next prefabricated structure (13) is also press-fitted while advancing the existing underground structure, and this work is repeated to carry out the operation of the existing underground structure ( This is to replace the existing underground structure (2) while sequentially connecting the ready-made structures (13) having a shape obtained by dividing the length of 2).

In the existing underground structure (2), the upper floor (2a) is trimmed (15) to the side wall (2b) as shown in FIGS. 7 and 8, and the lower floor (2c) is shown in FIG. The existing underground structure (2) which is not provided is shown.

In this way, since the existing underground structure (2) cuts off the upper floor (2a) and the side wall (2b) of the existing underground structure (2) and the existing structure (13), the method described above is used. When replacing by, it is possible to easily remove the side wall (2b) of the existing underground structure (2) from the arrival side (4) by an appropriate means such as destruction, and by removing this side wall (2b), the existing structure Existing underground structure (2) with a small propulsion force on the object (13)
Can be replaced with.

In addition, as shown in FIG. 2, in the case of an existing underground structure (2) in which the upper floor (2a) and the side wall (2b) are not cut off, the edge cut (before cutting with the ready-made structure (13) ( 15) is done beforehand. The edge cutting method is as shown in FIG. 9 in which rails (16) (1) are installed in the existing underground structure (2).
6) A temporary receiving stand (17) that can travel in the length direction of the structure is provided, and the upper receiving floor (2a) is supported by the temporary receiving stand (17),
In this state, the upper floor (2a) is cut off from the side wall (2a) by a water jet or other appropriate slit forming means (1
5) All that is required is to carry out, and then the front end of the prefabricated structure (13) is followed by the front end of the prefabricated structure (13) in the same manner as in the above-mentioned embodiment in a state in which the top end is aligned with the prefabricated substructure. While removing the side wall (2b) and the underfloor (2c) of the object (2) by an appropriate means such as destruction, the propulsion jack (12) is actuated to move the ready-made structure (13) to the existing underground structure (2). The existing structure (2) and the prefabricated structure (13) are replaced by advancing together with the upper floor (2a) and the temporary support (17).

Next, FIGS. 10 and 11 show another embodiment of the method for reconstructing an existing underground structure according to the present invention, in which the existing underground structure (2) is wider than the existing underground structure (2). It shows how to replace the existing large-scaled structure (13).

In this method, first, on the upper surface of the upper floor (2a) of the existing underground structure (2), the elongated plates (5) (5)
.. (5) are laid in parallel, and the upper floor (2a) is extended in both directions and the side walls (2b) and (2b) are spaced apart by a predetermined distance, that is, the widened ready-made structure (13) )
In the ground located at the outer peripheral edge in the cross-sectional shape of
The rectangular section (5) having the elongated plate (5) having the same plane shape as that of the upper surface is placed on the entire upper surface as shown in FIG. 4, and the distal end of the elongated plate (5) is fixed to the distal end by welding or the like. A pipe (6) shaped like an auger (not shown)
While digging the ground by inserting, the ground is sequentially buried between the starting side (3) and the reaching side to form a plurality of gate-shaped parallel pipe groups.

At this time, the rectangular pipes (6) (6) adjacent to each other are embedded while the engaging protrusions (6a) (6a) are engaged with each other.

After that, the ends of the elongated plates (5) are separated from the ends of the rectangular pipes (6) protruding on the arrival side (4), and the elongated plates are arranged in parallel on the upper floor (2a) of the existing underground structure (2). These elongated plates (5) embedded in a gate shape with (5)
On the start side (3) along the outer periphery of the connecting frame (9), as shown in FIG. 12, a continuous connecting frame (9) made of H-shaped steel or the like is arranged in a front gate shape. Elongated plate (5) on upper floor (2a) and elongated plate (5) of each rectangular pipe (6)
The rear end of the reinforced concrete is fixed integrally by an appropriate means such as welding, and the reaching side (4) is also erected upright along the outer periphery of the elongated plate (5) as shown in FIG. Gate-shaped fixing frame made of steel or steel (11)
Is closely adhered to and supported by the end surface of the planned underground structure buried ground, and the tip of each elongated plate (5) is physically fixed to the fixing frame (11) by welding or the like.

Furthermore, the foundation material (7) fixed to the ground surface of the starting side (3)
A reaction force receiving wall member (8) is erected on the top so as to be fixed or movable in a press-fitting direction, and the connecting frame (9) and the reaction force receiving wall member (8) are connected to each other by a connecting member (10) such as an anchor. ) To connect.

Further, a plurality of propulsion jacks (12) are attached to the reaction force receiving surface of the reaction force receiving wall member (8), and between the propulsion jacks (12) and the rear end surface of the ready-made structure (13) to be embedded. Make the push frame (14) intervene.

The upper floor (2a) of the existing underground structure (2) is the side wall (2b).
If the edge is not cut off (15), the edge is cut off (15) while the upper floor (2a) is supported by the moving temporary stand (17) in the same manner as in the above embodiment.

Next, the front end face of the widened ready-made structure (13) is brought into contact with the rear end of the upper floor (2a) of the existing underground structure (2) to the rear end of the pipe array arranged in a gate shape, and the widened ready-made structure is After making the outer peripheral surface of (13) along the inner surface of the elongated plate row, remove the side wall (2b) of the existing underground structure (2) from the portion in contact with the existing structure (13) by appropriate means such as destruction. While operating the propulsion jack (12), the ready-made structure (13) is press-fitted using the elongated plates as a guide while slidingly contacting the inner surface of the row of elongated plates arranged in a gate shape, and the existing underground structure (2) The upper floor (2a) and the rectangular pipe array are pushed out to the arrival side (4) according to the press fitting. At this time, the rectangular pipe row (6) and the upper floor (2a) extruded to the arrival side (4) are appropriately cut off at their protruding portions, and by the side wall outer surface of the existing underground structure (2) and the pipe row. The enclosed ground is excavated and removed from the front end side of the ready-made structure (13) by an appropriate means. In this case, if the blade end is integrally provided on the front end face of the ready-made structure (13) in advance, the ground can be excavated in accordance with the propulsion of the ready-made structure (13).

When the press-fitting of the widened ready-made structure (13) of a fixed length is completed in this way, the widened ready-made structure (13) of a fixed length to be buried next is followed by press-fitting in the same manner as described above to the existing underground structure. (2) and the widened ready-made structure (13) are replaced with each other, and the widened ready-made structure (13) is built on the mark of the existing underground structure (2).

In the above embodiment, the ready-made structure (13) was pressed from the starting side (3) by the propulsion jack (12), but the ready-made structure (13) was pressed from the arrival side (4) by an appropriate traction device. It may be towed, or both propulsion and towing means may be adopted at the same time.

〔The invention's effect〕

As described above, according to the method for reconstructing the existing underground structure of the present invention, after performing the work of laying the elongated plates in parallel on the upper floor upper surface of the existing underground structure provided under the rail or road,
Since the front end of the ready-made structure is brought into contact with the rear end surface of the existing underground structure, and the existing underground structure is replaced with the ready-made structure by propelling or towing the ready-made structure, it is simple. It is efficient in construction and can reconstruct underground structures in a short period of time, and it does not require temporary support girders as in the past, so trains do not have to slow down when constructing under rails. Furthermore, since replacement of an existing underground structure with a ready-made structure is performed while sliding these structures onto the elongated plate using the fixed elongated plate as a guide, there is no concern for moving the underground structure. No, the ground on the slender plate can be used as usual on the ground surface without moving.

Moreover, since the existing underground structure and the existing structure are replaced with each other while sliding on the inner surface of the elongated plate, the replacement can be easily performed by a relatively small-scale propulsion or traction means, and the existing underground structure can be replaced. Since the upper floor of the existing object is cut off from the side wall in advance, the existing underground structure can be removed by appropriate means such as destruction, and the existing structure can be moved forward with the upper floor of the existing underground structure. This makes it easier to replace the structure with the ready-made structure.

Further, on the side ground of the existing underground structure, pipes with slender plates placed on the side in contact with the ground are placed in parallel, and then the slender plates are fixed to the ground side. If the front end surface of a prefabricated structure that is larger than the object is directly or indirectly brought into contact with the rear end of the parallel pipe to advance the prefabricated structure, the fixed elongated plate will be used as a guide compared to the existing underground structure. It is possible to easily replace an existing structure with a widened structure with an existing underground structure.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of the present invention, wherein FIG. 1 is a simplified vertical sectional side view in a state of being replaced, and FIG. 2 is A in FIG.
-A line sectional view, FIG. 3 is a longitudinal side view of a part of the rectangular pipe, FIG. 4 is a longitudinal front view thereof, FIG. 5 is an end view of the starting side, FIG. 6 is a front view of the reaching side, 7 to 9 are vertical front views showing a state in which the upper floor and the side wall are cut off from each other;
FIG. 11 is a simplified vertical sectional side view showing another embodiment of the present invention, FIG. 11 is a vertical sectional front view thereof, FIG. 12 is an end view of the starting side thereof, and FIG.
The figure is a front view of the arrival side. (1) ... railway, (2) ... existing underground structure, (2a) ...
… Upper floor, (3) …… Starting side, (4) …… Arrival side, (5)
…… Slender plate, (6) …… Rectangular pipe, (8) …… Reaction force receiving wall member, (12) …… Propulsion jack, (13) …… Prepared underground structure, (15) …… Edge cutting.

Claims (3)

[Claims] 1. An existing underground structure comprising an upper floor and side walls, and at least the edges of the upper floor and the side walls being cut, a plurality of elongated plates being arranged in parallel in the length direction of the existing underground structure at least on the upper surface of the upper floor. And the ends of these elongated plates are fixed to immovable parts, the rear end of the existing underground structure is followed by the front end of the ready-made structure with its top end aligned, and then the existing underground structure. Replace the existing underground structure with the existing underground structure by advancing the existing structure together with the upper floor of the existing underground structure using the lower surface of the parallel elongated plate as a guide surface while removing the side wall of the structure by an appropriate means such as destruction. A method of reconstructing an existing underground structure, characterized by: 2. The existing underground structure according to claim 1, wherein after the upper floor of the existing underground structure is supported by a temporary cradle in the existing underground structure, the upper floor and the side wall of the existing underground structure are separated. How to remodel things. 3. A plurality of pipes, each having an elongated plate placed at the same height position as the upper floor of the existing underground structure, in the side ground of the existing underground structure where the edge between the upper floor and the side wall is cut. After placing them in parallel, fix the ends of the elongated plates to a fixed location, and then attach the front end face of an existing structure that is larger than the existing underground structure to the rear end of the existing underground structure and the parallel pipe. Directly or indirectly, by advancing the existing underground structure while removing the side wall of the existing underground structure by appropriate means such as destruction, the lower surface of the elongated plate as a guide surface to the existing underground structure and The method for reconstructing an existing underground structure according to claim 1, wherein the pipe is replaced with an existing structure.