JPH07208067A - Underground structure and burying method thereof - Google Patents

Abstract

PURPOSE:To thicken a soil cover on an upper floor slab of an underground structure replaced by a pipe roof notwithstanding the pipe roof is buried in the shallow ground under a road. CONSTITUTION:Earth retaining walls 3 and 4 are projected to the upper surfaces of both front and rear ends of an upper floor slab 1a of an underground structure 1 to mount earth on the upper surface of the upper floor slab 1a, so that a sub-base course layer 9 reaching the height of the walls is provided. First of all, after a pipe roof 7 mounting an edge cutting plate 8 thereon is buried in a shallow position in the ground between vertical shafts A and B provided on both sides of a rail 6, the front end face side of the earth retaining wall of the upper floor slab of the underground structure 1 is pushed against the rear end of the pipe roof 7 in one shaft A, and the underground structure 1 is driven forward and buried in the other shaft B side while sliding and contacting the upper end face of the earth retaining wall 3 to the lower surface of the edge cutting plate 8. After it is buried, the underground structure 1 is constructed under the rail 6 through the sub-base course layer 9 by removing the edge cutting plate 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of burying an underground structure in the ground such as under a railway track or under a road.

[0002]

2. Description of the Related Art Conventionally, for example, in order to construct an underground structure for forming a passage or the like in the ground below a track in a direction intersecting with the track, a track C is constructed as shown in FIG. After excavating vertical shafts A and B on both sides of the sandwich, a large number of steel square pipes with flat strip plate-shaped edge cutting plate D arranged on the upper surface are compatible. A pipe roof E is formed by press-fitting and embedding in parallel with the upper floor slab of the structure to form a pipe roof E, and then, on the rear end face of the pipe roof E, a drilling blade H on the front end side.
After abutting the front end face of the upper floor slab f of the underground structure F to which is attached and fixing the rear end of each of the edging plates D to one shaft A side, the rear end of the underground structure F is jacked. G is pushed forward by G or is pulled by an appropriate pulling means to guide the edge cutting plate D while excavating the front ground with the excavating blade H to advance the underground structure F to replace the pipe roof E. Is being built by.

[0003]

However, according to the method for constructing an underground structure, the underground structure is buried in the ground as shallow as possible by previously burying the pipe roof E at a shallow position in the ground. Although there is an advantage that the underground structure F is buried while sliding the upper surface of the upper floor slab f of the underground structure F to the lower surface of the edge cutting plate D left at a shallow position in the ground, After the burial, when the edge cutting plate D is removed, the earth cover G under the track with respect to the upper floor slab f of the underground structure F
As the track becomes shallower, a ballast compaction tool or the like hits the upper floor slab f of the underpass structure F during maintenance and inspection of the track C, which not only hinders maintenance work, but also cannot sufficiently compact the track. It was

Although such a problem can be solved by making the burying depth of the pipe roof E deep in advance,
Then, if the pipe hits an obstacle such as boulders existing in the ground during the propelling or burying of the pipe, it becomes difficult to remove the obstacle by excavation from the ground side. It is an object of the present invention to provide an underground structure and a method of burying it that can solve such problems.

[0005]

In order to achieve the above object, the underground structure according to claim 1 of the present invention is such that an earth retaining wall having a constant height is projected from the front end edge of the upper surface of the upper floor slab, and The earth and sand are placed on the upper surface of the upper floor slab up to the protruding height. Further, in the underground structure described in claim 2, in the invention described in claim 1, the earth and sand loaded on the upper floor slab is covered with a plurality of strips, and the front end of the strip is placed on the earth retaining wall. It has a structure that is fixed to.

Further, according to the method of burying an underground structure described in claim 1, as described in claim 3, a plurality of pipes having an edge cutting plate on the upper surface are placed at a shallow position in the ground. After forming a pipe roof by press-fitting parallel to the ground surface in a parallel state, a sediment retaining wall of a certain height is projected on the front end edge of the upper surface of the upper floor slab, and the upper floor slab reaches the height of the earth retaining wall. The front surface of the earth retaining wall of the underground structure where the earth and sand are placed on the upper surface of the above is opposed to the rear end of the pipe roof, and the underground structure is placed in the front ground with the edge cutting plate left in the ground. It is characterized in that it is buried below the edge cutting plate while pushing the pipe roof by propelling it along the lower surface of the edge cutting plate while excavating the edge cutting plate, and then removing the edge cutting plate.

The underground structure burying method according to a second aspect is the method according to the third aspect, as described in the fourth aspect, in which the pipe roof buried underground is underground. While pushing forward with the front end surface of the object, the underground plate is buried under the edge plate by sliding the strip plate material covered with the earth and sand on the upper deck of the underground structure to the lower surface of the edge plate, and propelling it. After that, the strip plate material and the edging plate are removed.

[0008]

[Operation] When substituting a pipe roof with an underground structure projecting a sand retaining wall of a certain height at the front edge of the upper floor slab and burying it underground, the upper surface of the upper floor slab of this underground structure The earth and sand reaching the height of the earth and sand stop wall are loaded on the plate, and the edge cutting plate placed on the upper surface of the pipe roof is released from the connection with the pipe roof and fixed immovably to the ground.
When propelling the underground structure and replacing it with the pipe roof in this state, the upper end surface of the earth retaining wall protruding from the front edge of the upper surface of the underground structure moves forward along the lower surface of the edging plate. The earth and sand loaded on the upper surface of the upper floor slab is prevented from being influenced by the ground in front of the earth and sand by the earth and sand retaining wall, and is propelled and buried in the ground integrally with the underground structure. At this time, by covering the earth and sand loaded on the upper surface of the upper floor slab with a plurality of strips, it is possible to reliably prevent the earth and sand from moving backward due to friction with the edge cutting material.

After burying an underground structure, if the edge cutting plate remaining in the ground is removed, the earth and sand loaded on the upper surface of the underground structure will become a roadbed layer and will be replaced with the underground structure. Even if is buried in a shallow position in the ground in advance, the underground structure can be buried deep in the roadbed layer from the ground surface by a thickness to form an earth cover having a predetermined thickness on the upper surface of the underground structure. In the case of the underground structure described in claim 2, the strip plate material is removed together with the edge cutting plate after the burial.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.
FIG. 3 shows an example of the underground structure 1, which is composed of upper and lower floor slabs 1a and 1b and both side plates 1c and 1c in a box-shaped body having a rectangular cross section. It is formed in the passage 2 having an open end. Further, earth and sand retaining walls 3 and 4 having a constant height over the entire width are projectingly provided at the front and rear ends on the upper surface of the upper floor slab 1a. The upper surface space part of the roadbed layer forming space part 5
I am trying.

The underground structure 1 constructed in this manner is used as a line 6
A method of constructing a passage that is buried in the ground below and is orthogonal to the line 6 will be described. First, as shown in FIG. 4, the length intervals of the passages to be built on both sides of the line 6 with the line 6 interposed therebetween. After excavating the vertical shafts A and B, a large number of steel square pipes 7a, each having a flat strip-shaped edge cutting plate 8 made of a steel plate placed on the upper surface thereof, are connected from one vertical shaft A side to the other vertical shaft. The pipe roof 7 having a width substantially the same as that of the underground structure 1 is formed by horizontally press-fitting and embedding in a parallel state in a shallow portion of the ground directly below the line 6 so as to penetrate between the Bs (FIGS. 2 and 5). ).

The burial work of the square pipes 7a is carried out while excavating the ground in front by an auger screw disposed inside the square pipes 7a, and the adjacent square pipes 7a are protruded from the opposite side surfaces thereof. The engaging fittings having an L-shaped cross section are embedded in parallel while engaging with each other. At this time, the front end of the edging plate 8 placed on the square pipe 7a is embedded in the front end of the square pipe 7a in an integrally fixed state by welding or the like, and after the pipe roof 7 is formed, the fixed portion is fixed. At the same time as cutting, the rear end of the edging plate 8 is fixed at a proper position on the side of one of the shafts A to immobilize the edging plate 8.

If the buried length is long, the square pipe 7a
The edge plate 8 may be divided into a plurality of pieces in the lengthwise direction, and the next divided pipe may be sequentially embedded at the rear end of the divided pipe that has been press-fitted and embedded first while integrally connecting the next divided pipe with bolts, nuts and the like. At this time, the front end of the split pipe to be buried first and the front end of the edging plate placed on the upper surface thereof are fixed by welding or the like, and the edging plates on the subsequent split pipes are sequentially connected integrally by welding or the like. Go!

After the pipe roof 7 is formed under the track between the compatible shafts A and B in this way, the underground structure 1 is arranged in one of the shafts A and the subbase layer on the upper floor slab 1a of the underground structure 1 is arranged. Earth and sand are loaded in the formation space 5 until the height of the front and rear earth and sand stop walls 3 and 4 is reached to form the roadbed layer 9. The roadbed layer 9 may be gravel or sand mixed with low-strength concrete, in addition to simple earth and sand.

The front surface of the front side debris retaining wall 3 of the underground structure 1 is opposed to the rear end surface of the pipe roof 7, and as shown in FIG. The underground rod 1 is propelled by extending the piston rod of the stopped hydraulic jack 10. At this time, the front surface of the front side debris retaining wall 3 of the underground structure 1 is directly brought into contact with the rear end surface of the pipe roof 7, and a blade opening 12 is attached to the opening front end of the underground structure 1 to cut the blade. The underground structure 1 may be propelled while excavating the ground in front by the mouth 12, and the pipe roof 7 may be pushed forward by the earth retaining wall 3 to replace the upper floor slab 1a of the underground structure 1, but after the pipe roof 7 A rectangular frame 13 is interposed between the end face and the front end face of the underground structure 1.

The frame 13 has an upper frame portion 13a formed in a horizontal frame portion which abuts the rear end surface of the pipe roof 7 over the entire width of the pipe roof 7, and both side frame portions 13c, 13c.
c and the lower frame 13b are the two-sided slabs 1c and 1c of the underground structure 1 and the lower floor slab.
It is formed on the frame portion that abuts on the front end surface of 1b.
Further, at the front end of the opening of the frame 13, the rectangular blade 12 for excavating the lower ground of the pipe roof 7 is integrally projected.

The frame 13 is interposed between the pipe roof 7 and the underground structure 1, and the front side sediment retaining wall 3 of the underground structure 1
When the underground structure 1 is propelled by extending the piston rod of the hydraulic jack 10 which presses the rear end surface of the underground structure 1 with the upper end surface of the sliding contact with the lower surface of the rear end portion of the edging plate 8. , The frame 13 integrally moves forward and its upper frame portion 13a
While pushing forward the pipe roof 7 and excavating the front ground by the blade 12, the ground not excavated by the blade 12 is excavated by an appropriate excavator through the passage 2 inside the underground structure 1, and the excavated earth and sand is pitted. The front end of the pipe roof 7 that is discharged to the A side and is pushed to the other vertical shaft B side is separated and removed.

When the underground structure 1 is propelled and buried in the ground for a certain length, the reaction force support plate 11 is added to the hydraulic jack 10 to replenish it.
Is moved forward and the hydraulic jack 10 is operated again in the same manner as above to propel the underground structure 1 for a certain length. In addition, instead of the method of propelling the underground structure 1 by the pressing force of the hydraulic jack 10, it may be propelled by pulling from the other shaft B side, or both may be used together.

When the underground structure 1 is promoted, its upper floor slab 1a
The upper surface of the roadbed layer 9 made of a sediment layer on the upper surface moves to the buried mark of the pipe roof 7 while slidingly contacting the lower surface of the edging plate 8. At this time, the roadbed layer 9 is prevented from being affected by the ground by the front and rear debris retaining walls 3 and 4, and the state of being loaded on the upper floor slab 1a of the underground structure 1 is maintained.
Further, the pipe roof 7 and the blade opening reaching the other shaft B side
This frame 13 with 12 is removed.

Thus, when the underground structure 1 is buried between the compatible shafts A and B, the roadbed layer 9 is interposed between the ballast 14 on which the track 6 is laid and the upper floor slab 1a of the underground structure 1. As shown in FIG. 6, the ballast 14 is supported on the roadbed layer 9 by removing the edge cutting plate 8 by taking out after the underground structure 1 is buried. When the pipe roof 7 is buried, part of the gutters 15 for wiring etc. provided along both sides of the line 6 are removed, so that after the edge cutting plate 8 is removed, both sides of the line 6 are removed. The side groove 15 is restored on the exposed side portion of the roadbed layer 9.

FIG. 7 shows another embodiment of the underground structure of the present invention. In the above-mentioned underground structure 1, a subbase layer 9 made of earth and sand loaded on the upper surface of the upper floor slab 1a is an underground structure having a length. The strip member 16 is made of a plurality of thin steel plates each having an appropriate width substantially equal to the length 1.
That is, the strip plate material 16 is installed side by side between the upper surfaces of the front and rear sediment retaining walls 3 and 4 to cover the roadbed layer 9, and the front end portion of each strip material 16 is set on the upper surface of the front sediment retaining wall 3 with a flat head screw or the like. It is fixed by an appropriate fixing means.

As a method of burying the underground structure 1 in the ground between the compatible pits A and B, the strip plate material 16 is slidably contacted with the lower surface of the edging plate 8 while pushing the pipe roof 7 to the other vertical shaft side. The same as the above method except that the strip plate material 16 is removed together with the edge cutting plate 8 after the burying.

That is, as described in the above method,
After forming the pipe roof 7 in the shallow ground under the track between the compatible shafts A and B, the pipe roof 7 is formed in one of the shafts A.
The front end of the front side debris retaining wall 3 of the underground structure 1 is directly brought into contact with the rear end face of the underground structure 1, or is brought into contact with the same through the frame 13, and the piston rod of the hydraulic jack 10 is extended to extend the underground structure 1. To promote. At this time, the front end of the edging plate 8 on the pipe roof 7 is separated from the front end of the pipe roof 7, and the rear end thereof is fixed at a proper position on the vertical shaft A.

When the underground structure 1 is propelled, the frame 13 is integrally advanced to push the pipe roof 7 by the upper frame portion 13a thereof and the front ground is excavated by the blade opening 12, while the excavation is made by the blade opening 12. The ungrounded ground is excavated by an appropriate excavator through the passage 2 inside the underground structure 1, the excavated earth and sand is discharged to the vertical shaft A side, and the front end portion of the pipe roof 7 pushed to the other vertical shaft B side is cut off. To remove. In accordance with the promotion of the underground structure 1, the strip plate material 16 provided in parallel between the upper surfaces of the front and rear debris retaining walls 3 and 4 slides on the lower surface of the edging plate 8 and integrally with the underground structure 1, as shown in FIG. The roadbed layer that moves forward and is loaded on the upper floor slab 1a is prevented from moving rearward by sliding contact with the edge cutting plate 8.

When the underground structure 1 is buried in the ground between the shafts A and B in this manner, the edge cutting plate 8 and the strip plate 16 are provided between the ballast 14 on which the track 6 is laid and the upper floor slab 1a of the underground structure 1. As shown in FIG. 6, the ballast 14 is placed on the roadbed layer 9 by removing the edge cutting plate 8 and the strip plate material 16 after the underground structure 1 is buried by removing the edgeboard 8 and the strip plate material 16 after the underground structure 1 is buried. The structure is supported by.

In each of the above embodiments, the pipe roof 7 was previously buried only at the position of the upper floor slab 1a of the underground structure 1, but the two side plates 1c and 1c of the underground structure 1 and the lower floor slab 1b were not embedded. It may be buried in the position, and when the buried length is long, the underground structure 1 is divided into appropriate lengths in a sliced structure, and the structures are sequentially connected and connected in series. It may be buried after loading earth and sand on the upper deck. Also,
The earth and sand retaining walls may be provided on both side edges of the upper floor slab 1a so as to project in a frame shape on the four side edges of the upper surface.
The object of the present invention can be achieved by projecting the front end edge.

Further, the underground structure 1 may be divided into upper and lower halves and may be propelled and buried in a state where the upper half portion and the lower half member are slidably combined with each other. After substituting the pipe roof 7 with an underground structure consisting only of an upper floor slab 1a with protruding earth and sand retaining walls, it is buried at a shallow position in the ground under the track, or while it is buried, a U-shaped cross section The upper surface of both side plates of the underground structure is buried along the lower surface of both sides of the upper floor slab 1a, or the lower ground of the upper floor slab 1a is excavated and the underground structure 1 is built by in-situ concrete casting. You may. The method for burying an underground structure according to the present invention is not limited to being used under a track, but can be applied under a road.

[0028]

As described above, according to the present invention, an underground structure formed by projecting an earth retaining wall having a constant height at least on the front edge on the four sides of the upper surface of the upper floor slab is used in advance. When replacing the pipe roof with an edge plate placed on the upper surface buried in a shallow position in the ground below, load the earth and sand reaching the height to the earth retaining wall on the upper surface of the upper floor slab to form the roadbed layer. It is formed by pushing the upper floor slab and pushing the pipe roof while burying the upper surface of the earth retaining wall along the lower surface of the edge cutting plate. It is possible to integrally propel the upper floor slab along the lower surface of the edging plate without being affected, and it is possible to integrally form a roadbed layer having a predetermined thickness under the road surface after being buried. At this time, if the roadbed layer on the upper floor slab is covered with a plurality of strip plates in advance, the roadbed layer is prevented from directly slidingly contacting the edging plate and does not move backward.

Therefore, the roadbed layer can thicken the overburden on the upper floor slab of the underground structure, which enables smooth maintenance and inspection of the road surface and prevents the upper floor slab from being damaged by the maintenance and inspection tool. It is a thing.

[Brief description of drawings]

[Fig. 1] Side view of a simplified vertical section of an underground structure being buried,

FIG. 2 is a simplified vertical sectional front view of a pipe roof buried in the ground,

FIG. 3 is a perspective view of an underground structure,

FIG. 4 is a vertical cross-sectional side view with vertical shafts provided on both sides of the track,

FIG. 5 is a vertical cross-sectional side view showing a state in which a pipe roof is embedded,

FIG. 6 is a vertical sectional side view showing a state in which an underground structure is buried,

FIG. 7 is a partially cutaway perspective view showing another underground structure of the present invention,

FIG. 8 is a simplified vertical sectional side view showing the buried state,

FIG. 9 is a simplified vertical sectional side view showing a conventional example.

[Explanation of symbols]

 1 Underground structure 1a Upper deck 3, 4 Sedimentation wall 6 Track 7 Pipe roof 8 Edge cut plate 9 Roadbed layer 16 Band material A, B Vertical shaft

Claims (4)

[Claims] 1. An underground structure characterized in that an earth retaining wall having a constant height is projected from the front edge of the upper surface of the upper floor slab, and the earth and sand are placed on the upper surface of the upper floor slab up to the protruding height. object. 2. A sand retaining wall having a constant height is projected from the front end edge of the upper surface of the upper floor slab, and earth and sand are placed on the upper surface of the upper floor slab to the protruding height to form a roadbed layer. An underground structure characterized in that it is covered with a plurality of strips, and the front end of the strips is fixed on the earth retaining wall. 3. A pipe roof is formed by press-fitting a plurality of pipes, each having an edge cutting plate on the upper surface thereof, at a shallow position in the ground in a parallel direction parallel to the surface of the earth, and then forming a pipe roof, and then, the front end of the upper surface of the upper floor slab. The front surface of the earth retaining wall of the underground structure, which is provided with the earth retaining wall of a certain height protruding from the edge and the earth and sand is placed on the upper surface of the upper deck to the height of the earth retaining wall, is the rear end of the pipe roof. Under the edge plate while advancing the pipe roof by propelling the underground structure along the lower surface of this edge plate while excavating the front ground while facing the edge plate and leaving the edge plate left in the ground A method for burying an underground structure, which comprises burying in an underground space and then removing the edge plate. 4. A pipe roof is formed by press-fitting a plurality of pipes, each having an edge cutting plate on the upper surface thereof, at a shallow position in the ground in parallel with each other in a direction parallel to the surface of the earth, and then forming an upper end of the upper surface of the upper floor slab. A plurality of parallel strips in which an earth retaining wall having a constant height is projected on the edge, and the earth and sand are placed on the upper surface of the upper floor slab up to the height of the earth and retaining wall, and the earth and sand are fixed at the front end on the earth and retaining wall. While excavating the ground in front of the underground structure with the front of the earth retaining wall of the underground structure covered with a plate facing the rear end of the pipe roof and leaving the edge plate left in the ground An underground structure characterized in that the strip plate material is slidably brought into contact with the lower surface of the edging plate so as to push the pipe roof to bury it below the edging plate while pushing the pipe roof, and then the strip plate material and the edging plate are removed. How to bury things.