JPH01304297A - Reconstruction of existing underground structure - Google Patents

Abstract

PURPOSE:To reconstruct the subject underground structure efficiently in a short period by simple execution without hindering the progress of a strain, etc., by propelling or drawing a ready-made underground structure abutted against the rear end of an existing underground structure and replacing the existing structure with the ready-made structure. CONSTITUTION:A plurality of slender plates 5 made of steel sheets are laid in parallel on the top face of the upper floor 2a of an existing underground structure 2 to be reconstructed, and the rear ends of the slender plates 5 are fixed by a connecting frame 9. A ready-made underground structure 13 having approximately the same sectional shape as the rear end face of the structure 2 is abutted against the rear end face of the structure 2 while a plurality of propulsion jacks 12 are installed to a pressure-receiving wall member 8. The structure 13 is pressed in while using the undersides of the slender plates 5 as guides through a pushing frame 14 by the jacks 12, and the structure 2 is extruded and replaced. The upper floor 2a and a sidewall are detached and reconstruction is facilitated, and the existing structure 2 is replaced with the ready-made structure in size larger than the structure 2 by employing pipes on which the slender plates 5 are placed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for renovating an existing underground structure in which a structure such as an existing underground passage installed under a rail or road is replaced with a new structure. It is.

[Conventional technology]

If an existing underground passage, etc. that is installed under the rail to cross the rail has become narrower due to long-term use, or as housing development or urban redevelopment progresses, it becomes necessary to rebuild it. In the conventional construction method, first, support piles are driven on both sides of the underground passage, the ground under the rails on the underground passage is removed at night, and the rails are erected between the upper ends of the support piles and supported by the support girders. After the temporary underpass is established, the existing underground passage is destroyed and a new one is constructed.

[Problem to be solved by the invention]

However, according to this underground passage reconstruction method,
The rails are temporarily supported with temporary support girders (construction girders), but construction cannot be carried out unless there is a break in the ground that allows the temporary support girder to be installed between the rail and the upper floor of the underpass. There is a problem in that trains must move slowly when passing through construction sites.

Furthermore, the construction period becomes extremely long because it takes a lot of time to erect temporary support girders, destroy existing underground passages, and construct new underground passages. As the location of the LJ becomes deeper, the underground passage must be built deeper accordingly, and therefore, it becomes necessary to form a steep slope for entering the underground passage or to lengthen the slope portion.

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

(Means for Solving the Problems) In order to achieve the above object, the method for renovating an existing underground structure according to the present invention provides a method for renovating an existing underground structure that includes at least a plurality of elongated plates on the upper surface of at least the upper floor in an underground structure consisting of at least an upper floor and a side wall. are laid in parallel in the length direction of the underground structure, and the ends of these elongated plates are fixed to immovable locations, and the front end of the ready-made structure is placed with its top end on the rear end side of the existing underground structure. After the prefabricated structure is brought into alignment, the prefabricated structure is moved forward by being propelled or towed, and the existing underground structure is replaced with the prefabricated structure using the lower surface of the parallel elongated plates as a guide surface. It is something to do.

[Operation] After carrying out the work of laying long and narrow plates in parallel on the top surface of the upper floor of the existing underground structure, the front end of the ready-made structure is brought into contact with the rear end surface of the existing underground structure to propel the ready-made structure. Alternatively, since both structures are replaced by traction, the underground structure can be renovated in a short period of time, and there is no need for temporary support girders or the like as in the past, so trains do not have to slow down. Moreover, since the replacement of an existing structure with a ready-made structure is carried out by sliding these structures on a fixed elongated plate as a guide, it is possible to replace an existing structure with a prefabricated structure. First, since the ground on the elongated plate does not move in any way, it does not impede the progress of trains, etc., and in addition, the structure can be replaced while sliding on the elongated plate using relatively small-scale propulsion or traction means. It is something that can be done.

Furthermore, if the upper floor of the existing underground structure is edged against the side wall in advance, the existing structure can be advanced together with the upper floor of the existing underground structure while the side wall of the existing underground structure is removed by appropriate means such as destruction. This makes it easier to replace existing structures with ready-made structures.

Furthermore, pipes with elongated plates placed on the side in contact with the ground are laid in parallel in the ground on the side of the existing underground structure, and then the elongated plates are fixed to the ground side. If the front end of a ready-made underground structure that is larger than the structure is brought into direct or indirect contact with the rear end of the parallel pipe and the ready-made underground structure is moved forward, the existing structure will be moved forward using the fixed elongated plate as a guide. It is possible to easily replace an existing structure with a widened structure.

〔Example〕

To explain the embodiment of the present invention with reference to the drawings, the rail (1)
When renovating an existing underground structure (2) that has been constructed across the rail (1) below, first consider the starting side (3) of the rail (1) and the arrival side of the other side. (4) On the upper surface of the upper floor (2a) of the existing underground structure (2), a plurality of elongated steel plates (5) (5)...(5) are attached to each other on both end surfaces in the longitudinal direction. Lay them in parallel so that they touch each other.

The work of laying this elongated plate (5) is carried out by excavating the ground below the rail (1) to release the upper floor (2a) of the existing underground structure (2), and then laying it on top of the upper floor (2a). This may be done by backfilling the ground, or the starting side (3) may be placed on the upper floor (2a) of the existing underground structure (2) while leaving the ground as it is.
Insert the elongated plate (
5) This may be done by press-fitting (5).

This press-fitting method is as shown in Figure 3.4.
The elongated plate (5
), and the tip of the elongated plate (5) is fixed to the tip G by welding etc. to make a steel pipe (6) with a rectangular cross section.
With the elongated plate (5) facing the upper floor (2a) of the existing underground structure (2), insert an auger (not shown) into the pipe (6) to level the ground. While excavating, penetrate between the starting side (3) and the reaching side. - The wooden rectangular pipe (6) is on the upper floor (2a) of the existing underground structure (2)
When the rectangular pipe (6) is laid in a penetrating state, the engaging protrusions (6a) (6
In b), insert the engaging protrusion (6a) or (6) 1) protruding from the opposite side of the next rectangular pipe (6) to be press-fitted without engaging it. Repeatedly, a group of rectangular pipes arranged in parallel on the upper floor (2a) of the existing underground structure (2) is formed using the plurality of 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 the rectangular pipe (6) is separated.
) and attach the elongated plate (5) to the existing underground structure (2).
) are laid in parallel on the upper floor (2a). At this time, the void created after the rectangular pipe (6) is removed is appropriately filled with earth and sand.

Another method for laying the elongated plate (5) is to use a poling machine to drill a hole in the ground above the upper floor (2a) of the existing underground structure (2), insert a wire into the hole, and then insert the wire after the wire. Connect the elongated plate (5) to the end, pull the wire from the reaching side (4), and install the elongated plate (5) on the upper floor (2a) of the existing underground structure (2). Good too.

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

Furthermore, as shown in Fig. 5, a connecting frame (
9) is placed in contact with the ground, and this connecting frame (9) is placed in contact with the ground.
), the rear end of the elongated plate (5) is integrally fixed by an appropriate means such as welding, and the connecting frame (9) and the reaction force receiving wall member (8) are connected with a connecting member such as an anchor (0ω). .

On the other hand, as shown in Fig. 6, a fixing frame (11) made of reinforced concrete or steel is arranged along the upper part of all the elongated plates (5) protruding toward the reaching side (4), and the fixing frame (
11), the tips of each elongated plate (5) are integrally fixed by welding or the like, and the space between the fixing frames is brought into close contact with and supported by the end surface of the ground.

In addition, a prefabricated underground structure 03) of a certain length to be buried with approximately the same cross-sectional shape as the existing underground structure (2) is designated as the existing underground structure = 8
= The reaction force receiving wall member (8
A plurality of propulsion jacks (12) are attached to the reaction force receiving surface of ), and a push frame 64) is interposed between the propulsion jacks 02) and the rear end face of the ready-made underground structure 03).

After arranging it in this way, if the propulsion jack (12) is activated to extend it, the ready-made underground structure (13) will become a push frame (
The upper surface of the upper floor (13a) is connected to the elongated plate (5) through the
), and the existing underground structure (2) is press-fitted while being guided, and the upper floor (2a) of the existing underground structure (2) is slid into contact with the lower surface of the elongated plate (5), and the reaching side (4) is pressed in while being guided.
) is pushed out.

At this time, if the existing underground structure (2) has a large positive resistance due to its close contact with the ground and it is difficult to push out the existing underground structure (2) with the propulsive force of the propulsion jack (12),
The elongated plate (5) may be further installed along the outer surface of the side wall of the existing underground structure (2), or the rear end of the side wall of the existing underground structure (2) may be gradually destroyed while increasing the size of the existing underground structure 03). All you have to do is reduce the resistance.

When the prefabricated underground structure 03) is press-fitted to a certain length, the propulsion jack 02) is contracted and the next press frame 04) is attached.
] 0-, press-fit the existing underground structure 03) again, and accordingly move the existing underground structure 2) to the reaching side (
4) Push it out.

In this way, when the underground structure (2) 03) is moved forward by the pressure of the propulsion jack 02), the reaction force is received by the reaction force receiving wall member (8), and the reaction force is absorbed by the reaction force receiving wall member (8). 1F reception
The wall member (8) tries to move backward, but this reaction force receiving wall member (8) is connected to the rear end of the elongated plate (5) via a connecting member (1ω), and furthermore, the elongated plate The front end of (5) is the fixing frame (4) that is pressed against the end surface of the ground on the reaching side (4).
Since the reaction force receiving wall member (8) is connected to the mark, the reaction force receiving wall member (8) is placed at a certain position due to the frictional force between the outer surface of the elongated plate (5) and the ground and the receiving force of the ground against the anchoring frame (11). to ensure that the reaction force is received.

In this way, when the press-fitting of the ready-made underground structure 03) of a certain length is completed, next, the ready-made underground structure 03) of a certain length to be buried next is connected to the rear end face of the ready-made underground structure (13). Then, the rear end of this ready-made underground structure 03) is received by the push frame 04) on the starting side (3).

In this state, the propulsion jack 02) is operated, and in the same manner as described above, the next existing underground structure 03) is also pressed into the existing underground structure by advancing it, and this operation is repeated to move the existing underground structure (2) The existing underground structure (2) is connected sequentially to the ready-made underground structure (03), which is divided into multiple lengths.
.

7M and 8 show modifications of the above embodiment,
The second gear (2a) of the existing underground structure (2) is connected to the side wall (211
Fig. 8 shows a structure in which the subfloor (2c) is not integrally provided with the underground structure (2).

In such an existing underground structure (2), the elongated plates (5) are laid and fixed in parallel on the second gear (2a)-1 in the same manner as in the above embodiment, and then the existing underground structure (2) is installed. 2)
After following the front end of the existing underground structure 03) with its top end aligned with the rear end surface, the existing underground structure (2)
While removing the side wall (2b) from the reaching side (4) by appropriate means such as destruction, the propulsion jack (12) is operated to move the ready-made structure (13) into the second gear of the existing underground structure (2). (
2a) to replace the existing structure (2) and the existing structure 03), and compared to the case where the existing structure (2) is pushed forward as a whole, it is a small advance. Can be replaced by force.

In addition, an existing underground structure (2) in which the upper floor (2a) is not edged to the side wall (2b) is referred to as a ready-made underground structure 03).
In order to perform edge cutting 05) before replacing it with a temporary cradle (171) that can run in the length direction of the structure on the rail Cω0ω, a The upper floor (2a) is supported by the temporary cradle (171),
In this state, the upper floor (2a) may be edged from the side wall (2b) using a walk jet or other suitable slit forming means, and then the rear end surface of the existing underground structure (2) is cut in the same manner as in the above embodiment. Ready-made underground structures (13)
The front end of the propulsion jack 02) is aligned with the top end of the propulsion jack 02), and the side wall (2b) and subfloor (2C) of the existing underground structure (2) are removed by appropriate means such as destruction. It is activated to move the ready-made structure 03) forward together with the upper floor (2a) and temporary support surface of the existing underground structure (2), replacing the existing structure (2) and the ready-made structure 03).

Next, FIGS. 10 and 11 show another embodiment of the method for renovating an existing underground structure according to the present invention.
- It shows a method of replacing an existing underground structure (2) with a larger ready-made underground structure (13) that is wider than the existing underground structure (2).

In this method, a strip plate (5) (5) is placed on the upper surface of the upper floor (2a) of the existing underground structure (2) in the same manner as described above.
... (5) are installed in parallel, and
a) extending in both directions and side walls (2b) (2b
), that is, in the ground located at the outer peripheral edge of the expanded cross-sectional shape of the prefabricated underground structure 03), the entire upper surface is flush with the upper surface as shown in Figure 3.4. The pipe (6), which has a rectangular cross-section and is made by placing the elongated plate (5) having the same shape and fixing the tip of the elongated plate (5) to the tip by welding or the like, is fitted with an auger (Fig. (not shown) and while excavating the ground, they are sequentially buried between the starting side (3) and the destination side, forming a group of parallel pipes having an overall portal shape.

At this time, the adjacent rectangular pipes (6) and (6) are embedded without engaging the engaging protrusions (6a) and (6b) with each other.

After that, each rectangular pipe (
The tip of the elongated plate (5) is separated from the tip of the elongated plate (5), and the elongated plate (5) is placed in parallel on the upper floor (2a) of the existing underground structure (2).
) along the outer periphery of these elongated plates (5) buried in a portal shape, on the starting side (3), as shown in Fig. A frame (9) is arranged, and the elongated plate (5) on the upper floor (2a) and the elongated plate (5) of each rectangular pipe (6) are attached to this connecting frame (9).
The rear ends are fixed together by appropriate means such as welding, and reinforced concrete is similarly installed on the reaching side (4) along the outer periphery of the elongated plate (5) as shown in Figure 13. A gate-shaped fixing frame made of steel or steel (1
1) is closely attached to and supported by the end face of the planned underground structure physical installation ground, and the tip of each elongated plate (5) is integrally fixed to the fixing frame (11) by welding or the like.

Furthermore, the foundation material (7) fixed to the ground surface on the starting side (3)
A reaction force receiving wall member (8) is fixedly or movably provided in the press-fitting direction, and the connecting frame (9) and the reaction force receiving wall member (8) are erected on the top.
8) with a connecting member (10) such as an anchor.

In addition, a plurality of propulsion jacks (12) are attached to the reaction force receiving surface of the reaction force receiving wall member (8), and pushed between the propulsion jacks 02) and the rear end surface of the ready-made underground structure 03) to be buried. Frame 04
) to intervene.

Note that the upper floor (2a) of the existing underground structure (2) is connected to the side wall (2).
If the edges are not cut 05) from b), the edges are cut 09 in the same manner as in the second embodiment with the upper floor (2a) supported by the movable temporary support 0'7).

Next, the front end surface of the widened ready-made underground structure (13) is brought into contact with the rear end of the pipe row arranged in a gate shape from the rear end surface of the upper floor (2a) of the existing underground structure (2), and the widened ready-made underground structure After aligning the outer peripheral surface of structure 03) with the inner surface of the row of elongated plates, the side wall (2b) of the existing underground structure (2) is removed from the part that contacts the ready-made underground structure 03) by appropriate means such as destruction. If the propulsion jack 02) is operated while scattering, the ready-made structure (!3) will be press-fitted into the existing underground structure (!3) while slidingly contacting the inner surface of the row of elongated plates arranged in a gate shape, using the elongated plates as a guide. 2) The upper floor (2a) and the rectangular pipe row are pushed out to the reaching side (4) in response to the press-fitting. At this time, the rectangular pipe (6) pushed out to the reaching side (4) and the upper floor (2
In a), the protrusion is removed as appropriate, and the ground surrounded by the outer surface of the side wall of the existing underground structure (2) and the pipe row is excavated from the front end side of the existing underground structure (03) by appropriate means, Exclude. In this case, if a cutting edge is previously provided integrally with the front end face of the ready-made underground structure 03), the ground can be excavated as the ready-made underground structure 03) is propelled.

In this way, when the press-in of the widened underground structure 03) of a certain length is completed, the widened underground structure 03) of a certain length to be buried next is completed.
3) and press-fit in the same manner as described above to replace the existing underground structure (2) and widened ready-made underground structure 03), and place the widened underground structure 03) at the site of the existing underground structure (2). It is something to build.

In the above embodiments, the ready-made underground structure 03) was pressed by the propulsion jack 02) from the starting side (3), but the ready-made underground structure (13) was pushed from the reaching side (4) by an appropriate traction device. It may be towed, or both propulsion and traction means may be employed simultaneously.

〔Effect of the invention〕

As described above, according to the method for renovating an existing underground structure of the present invention, after performing the work of laying elongated plates in parallel on the upper surface of the second gear of the existing underground structure installed under the rails or under the road. , the front end of a ready-made underground structure is brought into contact with the rear end face of the existing underground structure, and the ready-made underground structure is propelled or towed to replace the existing underground structure with a ready-made underground structure. Therefore, underground structures can be renovated with simple and efficient construction in a short period of time, and there is no need for temporary support girders or the like as in conventional methods, so trains can move slowly when construction is carried out under the tracks. Furthermore, the replacement of existing underground structures with ready-made underground structures
Because these structures are slid into contact with a fixed elongated plate as a guide I, the ground on the elongated plate does not move at all even though the underground structure moves.
The ground surface can be used normally.

In addition, since both aboveground structures are replaced with each other while sliding on the inner surface of the elongated plate, it is possible to easily perform the vC replacement using a relatively small-scale propulsion or traction means, and also to replace the existing underground structure. If the upper floor has been edged against the side wall in advance, the side wall of the existing underground +1N structure is removed by appropriate means such as destruction, and the existing ~19- type structure is moved forward together with the upper floor of the existing underground structure. This makes it easier to replace existing structures with ready-made structures.

Furthermore, pipes with elongated plates placed on the surfaces in contact with the ground are laid in parallel on the side ground of the existing underground structure, and the elongated plates are fixed to the ground side. If the front end of a ready-made underground structure that is larger than the object is brought into direct or indirect contact with the rear end of the parallel pipe and the ready-made underground structure is moved forward, the fixed elongated plate will be used as a guide to move the ready-made underground structure from the existing structure. It is also possible to easily replace existing structures with widened structures.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a simplified jointed side view of the replaced state, and FIG. 2 is a side view of A in FIG. 1.
-A sectional view, FIG. 3 is a longitudinal sectional side view of a part of the rectangular pipe, FIG. 7 to 9 are longitudinal sectional front views showing modified examples of the present invention, FIG. 10 is a simplified longitudinal sectional side view showing another embodiment of the invention, FIG. 11 is a longitudinal sectional front view thereof, and FIG. FIG. 13 is an end view of the starting side, and FIG. 13 is a front view of the reaching side. (1)...Rail, (2)...Existing underground structure, (2
a)...Upper floor, (3)...Starting side, (4)...
Reaching side, (5)...Slender plate, (6)...Rectangular pipe, (8)...Reaction force receiving wall member, 02)...Propulsion shank, 03)...Ready-made underground structure Thing, θω... edge cutting.

Claims (4)

[Claims] (1) In an underground structure consisting of at least an upper floor and side walls, a plurality of elongated plates are laid in parallel in the length direction of the underground structure on at least the upper surface of the upper floor, and the ends of these elongated plates are placed in immovable locations. The front end of the ready-made structure is placed behind the rear end of the existing underground structure with its top end aligned with the rear end of the existing underground structure, and then the ready-made structure is moved forward by being propelled or towed. A method for remodeling an existing underground structure, characterized by replacing the existing underground structure with a prefabricated structure using the lower surfaces of parallel elongated plates as guide surfaces. (2) In an underground structure consisting of an upper floor and a side wall, where the edge between the upper floor and the side wall is cut, a plurality of elongated plates are laid in parallel in the length direction of the underground structure at least on the upper surface of the upper floor. At the same time, the ends of these elongated plates are fixed to immovable locations, and the front end of the ready-made structure is followed with its top end aligned with the rear end side of the existing underground structure, and then the existing underground structure is installed. Renovation of an existing underground structure characterized by replacing the existing structure with the existing structure by advancing the existing structure together with the upper floor of the existing underground structure while removing the side walls of the existing underground structure by appropriate means such as destruction. Method. (3) The existing underground structure according to claim 2, wherein the upper floor of the existing underground structure is supported by a temporary support within the existing underground structure, and then the upper floor and side wall of the existing underground structure are separated. How to renovate things. (4) After installing pipes in parallel on the side ground of the existing underground structure, with long thin plates placed on the side that is in contact with the ground, the long thin plates are fixed in immovable locations, and then the existing underground structures are installed. By bringing the front end of a ready-made underground structure larger than the underground structure into direct or indirect contact with the rear end of the parallel pipe and moving the ready-made underground structure forward, the fixed elongated plate is used as a guide to connect the pipe. 4. The method for renovating an existing underground structure according to claim 1, wherein the method comprises replacing an existing underground structure with a prefabricated structure.