JPH0735719B2 - How to build an underground structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention does not hinder upper traffic when excavating a large number of underground structures in the lower ground such as railways and roads in a transverse direction. The present invention relates to a method of constructing an underground structure that can be constructed.

[Conventional technology]

In order to excavate a large number of underground structures made of reinforced concrete in the lower ground such as railways and roads in the transverse direction, protective work is required to support upper traffic, and conventional steel pipes etc. must be horizontal as such protective work. Although it is possible to install parallel pipe roofs, etc., it is safe, reliable, and inexpensive because it is performed simultaneously with the excavation of the underground structure without constructing a protective work for the underground structure to be excavated underground as a separate work. As a work that can be done and the soil cover can be done shallowly,
The following construction methods are known.

As shown in Fig.15, this is done by placing a retaining steel sheet pile 2 on the side of the upper traffic 1 such as a railway, and constructing a starting pit 3 and a reaching pit 4,
A press-fitting machine 5 is installed in the starting pit 3 to press the roof cylinder 6 toward the reaching pit 4.

FIG. 10 is a front view of the roof tubular body 6, which is a box-shaped tubular body made of a steel pipe and having a substantially square cross section. The hook-shaped constituent members are lined outward on the side and male joints 6a are lined inward. The female joint 6b is formed continuously in the longitudinal direction, and the friction cutter 7 made of a flat plate is attached to the upper surface.

In this roof cylinder 6, the unit cylinders are press-fitted one by one, but as shown in FIG. 11, a box-extracting joint flange 6c is formed at the end, and the joint flanges 6c are fastened together with bolts and nuts 19. As a result, the pieces can be added one by one in the lengthwise direction to bury the required length, and the pieces can be arranged side by side in the lateral direction via the joints 6a and 6b. The press-fitting machine 5 has an extruding mechanism such as a jack of the cylindrical body 6 and an internal excavating mechanism of the cylindrical body 6 such as an auger. Cylinder 6
As shown in Figs. 12-14, the arrangement of
(Fig.), Gate type (Fig. 13), box type (Fig. 14), etc. are selected as appropriate according to the underground structure 9 to be arranged later.

Next, as shown in FIG. 16, a reaction wall 8 and an underground structure 9 made of a concrete box are set in the starting pit 3, and a propulsion jack 10 is provided between the reaction wall 8 and the underground structure 9. A blade 11 is provided at the tip of the underground structure 9 and a small jack 12 is interposed between the tip of the underground structure 9 and the roof cylinder 6.

In the figure, 13 is a support member for the roof cylinder 6, 14 is a stop member for the friction cutter 7, which are provided on the starting pit 3 side, while a pedestal 15 is provided on the reaching pit 4 side.

The small jacks 12 are extended and the underground structure 9 is used as a reaction force to push the roof cylinders 6 one by one while leaving the friction cutter 7, and once the cylinders 6 have advanced, the small jacks 12 are contracted. Extends the propulsion jack 10 to advance the underground structure 9. Reference numeral 16 in the figure denotes a strut interposed between the propulsion jack 10 and the underground structure 9.

In this way, the forward movement of the roof cylinder 6 and the underground structure 9
While alternately repeating the above-mentioned forward movement, the roof cylinder 6 that has come out to the reaching pit 4 is sequentially removed.

Then, when the tip of the underground structure 9 reaches the reaching pit 4, the blade opening 11 and the like are removed and backfilling grout is appropriately performed to complete the construction.

[Problems to be Solved by the Invention]

The roof cylinder 6 penetrates the first one from the starting pit 3 to the arrival pit 4 and then presses the adjacent ones side by side. At that time, the roof cylinder 6 bends to open between the tip and the roof cylinder 6. There is a possibility that the male type joint 6a and the female type joint 6b may mesh with each other more strongly than necessary due to the occurrence or mixing of earth and sand, and it may not be possible to push them well and push out from the starting pit 3 to the reaching pit 4.

In addition, the parallel roof cylinders 6 extend the small jacks 12 and sequentially push the underground structures 9 one by one as a reaction force, and when the cylinders 6 have moved forward, the small jacks 12 are contracted and propelled this time. Since the jack 10 is extended and the underground structure 9 is excavated, it is divided into two steps, which requires a large number of steps and a long construction period.

Further, in the tubular body 6, both the male joint 6a and the female joint 6b have angle pieces as their constituent members, which are completely fixed and attached to the steel pipe which is the main body of the tubular body 6 by the welding. If it is not possible to sufficiently secure the above, it is necessary to gas-disconnect the joint 6b in order to recover the roof cylinder 6 in the reaching pit 4, but this requires a lot of work, and in the case of reuse, It has to be re-welded again, which is very troublesome and labor-intensive.

An object of the present invention is to eliminate the inconveniences of the above-mentioned conventional example, to prevent excessive coupling of the joints of the roof cylinder with each other except the tip portion, and to smoothly push out from the starting pit 3 to the reaching pit 4. Since the roof cylinders that can be secured and are parallel to each other are dug with the underground structure, it is not necessary to propel only the roof cylinders, and the roof cylinders extruded to the reaching pit must have their joints cut except at the tip. It is to provide a method of constructing an underground structure that can be removed without any trouble.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention has a friction cutter material disposed on the upper surface thereof, and a pair of outwardly facing hook-shaped engaging pieces including the tip portion on one side thereof protruding in the lengthwise direction, and the other A pair of inward hook-shaped engaging pieces projecting at the tip of the side part of the box, and a box-shaped roof cylinder having a pair of horizontal plate engaging pieces projecting in the lengthwise direction behind it. Adjacent box-shaped roof cylinders have a pair of outwardly facing hook-shaped engaging pieces and a pair of inward-looking hook-shaped engaging pieces fitted to each other at the tip end thereof, and the rear portion thereof is hooked between the horizontal plate engaging pieces. While inserting the mold engaging pieces in parallel while being engaged, press fit into the ground so as to penetrate from the starting pit to the reaching pit, and arrange the underground structure at the rear part of the roof cylinder remaining in the starting pit, friction cutter While the material is left in the ground, the roof cylinder and the underground structure are simultaneously advanced, and the roof cylinder that has reached the arriving pit is sequentially removed, When the tip of the lower structure reaches the pit, the construction is completed, or a friction cutter material is placed on the upper surface and one side part including the tip part is a pair of outward hook-shaped engagements. One piece protrudes in the length direction, a pair of inward hook-shaped engagement pieces protrudes at the tip of the other side portion, and a pair of horizontal plate engagement pieces is formed in the rear side in the length direction. The adjacent box-shaped roof tubular body, the adjacent box-shaped roof tubular body, the tip portion, a pair of inward hook type engaging pieces and a pair of outward hook type engaging pieces are fitted, then One side is that the horizontal plate engagement pieces are inserted between the hook-shaped engagement pieces, and they are juxtaposed in an engaged state and pressed into the ground so as to penetrate from the starting pit to the reaching pit, and the rear part of the roof cylinder that remains in the starting pit. An underground structure is installed in the ground, and while the friction cutter material is left in the ground, the roof cylinder and the underground structure are simultaneously excavated. Roof accommodating cylinder which comes into pit is sequentially removed, in which the tip of the underground construction is summarized in that to complete the construction Once reached the arrival pit.

[Action]

According to the present invention, since the box-shaped roof tubular body is fitted with the outward hook-shaped engaging pieces and the facing hook-shaped engaging pieces only at the leading edge where there is a blade edge with respect to the adjacent tubular bodies, There is no need for the roof cylinders to be separated from the tip left and right and press-fitted.
It is firmly engaged and there is no risk of disengagement.

And, behind that, while the outward facing hook type engaging piece is inserted between the horizontal plate engaging pieces, or the horizontal plate engaging piece is inserted between the inward facing hook type engaging pieces, the vertical direction is restrained. The adjacent cylinders are pushed as guides. At that time, since the hook-shaped engaging pieces are not restrained in the left-right direction between the horizontal plate engaging pieces, they do not engage with each other more than necessary even if a bend occurs in the progress, and they are smoothly pushed to the reaching pit.

In addition, since the roof cylinder that has been excavated simultaneously with the underground structure and pushed out to the arrival pit has no left-right restraint except near the forefront, it can be taken out by simply sliding it sideways. .

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The roof tubular body used in the construction method of the present invention will be described first. The tubular body 6 to be juxtaposed is a box-shaped steel pipe having a substantially square cross section with the friction cutter 7 attached to the upper surface as in the conventional example. As shown in FIG. 7, only the frontmost unit tubular body having a blade opening in the roof tubular body 6 has a pair of outward hook-shaped engaging pieces 20 on one side only on the tip end or on the entire length, and the other on the other side, as in the conventional case. A pair of inward hook-shaped engaging pieces (22) are projected on the side portions of these, and these engaging pieces (20, 21) are fitted together.

As shown in FIGS. 1 and 2, on the rear side, as shown in FIGS. 1 and 2, the pair of outwardly facing hook-shaped engaging pieces 20 are continuously provided in a projecting manner on one side surface, and a pair of outward facing hook-type engaging pieces 20 are provided on opposite side portions. Horizontal plate engaging pieces (21) were continuously provided in the longitudinal direction with a vertical interval.

The projection width of the horizontal plate engaging piece 21 is narrower than the horizontal portion 20a of the hook-type engaging piece 20, and the interval between the upper and lower horizontal plate engaging pieces 21 is smaller than that of the hook-type engaging piece 20. The hook-shaped engaging piece (20) is allowed to enter the horizontal plate engaging piece (21) slightly larger than the distance between the tips of the bent pieces (20b).

As shown in FIG. 2, the hook-shaped engaging piece 20 may have a double horizontal piece 20a to increase its strength.

Further, as a second embodiment, as shown in FIG. 3, one of the adjacent roof cylinders 6 has hook-shaped engaging pieces 20 on both sides of the side.
Alternatively, the horizontal plate engaging pieces 21 may be protruded on both sides of other parts.

Next, the method of the present invention performed using the above cylinder 6 will be described.

As shown in FIG. 5, an earth retaining sheet pile 2 is driven beside the upper traffic 1 such as a railway to construct a starting pit 3 and a reaching pit 4, and an pushing mechanism and an auger using a jack or the like are provided in the starting pit 3. A press-fitting machine 5 having an internal excavation mechanism for the tubular body 6 is installed, and the roof tubular body 6 is press-fitted toward the reaching pit 4.

The roof cylinder 6 penetrates the first one from the starting pit 3 to the reaching pit 4 and then presses the adjacent ones side by side. However, only the tip is a pair of outward hook-shaped engagement pieces on one side. 20
, A pair of inward hook-shaped engagement pieces 22 are projected on the other side,
These engaging pieces 20 and 21 are fitted to each other, and the hook-type engaging piece 20 is inserted between the horizontal plate engaging pieces 21 of the adjacent tubular body 6 at the rear of the engaging pieces 20 and 21 so that the engaging pieces 20 and 21 are restrained in the vertical direction. The roof tubular body 6 press-fitted into is pushed forward while being used as a guide, and finally it is juxtaposed laterally.

In this case, the protruding width of the horizontal plate engagement piece 21 is the hook-shaped engagement piece 20.
Since the width is narrower than the horizontal portion 20a of the
The bending piece 20b also slides while being joined to the side surface of the adjacent roof cylinder 6 and is accurately guided.

Next, as shown in FIG. 6, a reaction wall 8 and an underground structure 9 made of a concrete box are set in the start pit 3, and a propulsion jack 10 is provided between the reaction wall 8 and the underground structure 9. A blade 11 is provided at the tip of the underground structure 9. Further, the rear end of the roof tubular body 6 juxtaposed with the front end of the underground structure 9 is connected by a frame (not shown) or a supporting member 13, and the rear end of the friction cutter 7 is connected by a stop member 14 to the starting shaft 3 Fixed to the side, while
A pedestal 15 is provided on the side of the reaching pit 4.

The propulsion jack 10 is extended, and the roof cylinder 6 and the underground structure 9 are simultaneously advanced while leaving the friction cutter 7. Reference numeral 16 in the figure denotes a strut interposed between the propulsion jack 10 and the underground structure 9.

In this way, the forward movement of the roof cylinder 6 and the underground structure 9
When the unit cylinder 1 piece is completely exposed in the reaching pit 4 while advancing at the same time as the advance of, the joint flanges 6c are unfastened with the bolts and nuts 19 and divided in the length direction,
Moreover, the pieces are separated by sliding them horizontally, and then lifted in a horizontal state to remove them one by one.

Then, when the tip of the underground structure 9 reaches the reaching pit 4, the blade opening 11 and the like are removed and backfilling grout is appropriately performed to complete the construction.

The underground structure 9 may be constructed by sequentially suspending and connecting precast concrete boxes in the start pit 3 or by placing concrete in the start pit 3 to increase the required length. You may do it.

Regarding the propulsion method of the underground structure 9, a reaction wall and a center-hole type towing jack are provided on the arrival pit 4 side, and a towing member made of a PC steel wire having one end fixed to the underground structure 9 is used with this towing jack. Reaching pit 4 by pulling
The underground structure 9 can be pulled in from the side.

FIG. 8 and FIG. 9 show still another embodiment. A cylindrical body 6 having a friction cutter 7 mounted on the upper surface thereof has a pair of inner spaces having the same vertical spacing as a conventional hook-shaped joint 6b on one side surface. Directional hook-shaped engagement pieces 22 are continuously projected in the lengthwise direction, and a pair of horizontal plate engagement pieces 21 are continuously projected in the lengthwise direction at the opposite side portions with a vertical gap. .

The projection width of the horizontal plate engaging piece 21 is narrower than that of the horizontal portion 22a of the hook-type engaging piece 22, and the interval between the upper and lower horizontal plate engaging pieces 21 is smaller than that of the hook-type engaging piece 20. It was made slightly smaller than the interval between the tips of the bent pieces 20b, and the horizontal plate engagement piece 21 was able to enter between the hook-shaped engagement pieces 22.

Even in this case, the usage and operation are the same as those in the above embodiment.

〔The invention's effect〕

As described above, the method for constructing an underground structure of the present invention is such that the adjacent roof cylinders are not press-fitted separately from the left and right from the tip, while the roof cylinder except for the tip. It is possible to press fit more than necessary to each other's joints and smoothly press-fit them in the ground to make them parallel, and further, the parallel roof cylinders can reduce the number of man-hours and the construction period by proceeding simultaneously with the underground structure. Moreover, the roof cylinder extruded into the narrow reaching hole can be removed without cutting the joint except the tip.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a method for constructing an underground structure of the present invention, FIG. 2 is a front view of a main part of the same as above, and FIG. 3 is a front view showing a second embodiment of the same as above. The drawing is a front view of the vicinity of the roof blade portion of the roof, FIGS. 5 to 7 are side views showing each step of FIG. 8, FIG. 8 is a front view showing a third embodiment, and FIG. Front view, FIG. 10 is a vertical sectional front view of a conventional roof cylinder, FIG. 11 is a partial perspective view of the same as above, and FIGS. 12 to 14 are front views showing the arrangement of the cylinders, and FIG. FIG. 17 is a side view of each step showing a conventional example. 1 ... Upper traffic, 2 ... Suchidome steel sheet pile 3 ... Starting pit, 4 ... Drilling pit 5 ... Pressing machine, 6 ... Roof cylinder 6a, 6b ... Joint, 6c ... Joint flange 7 ... Friction cutter 8 ... Reaction wall, 9 ... Underground structure 10 ... Propulsion jack, 11 ... Blade 12 ... Small jack, 13 ... Support material 14 ... Fixing member, 15 ... Cradle 16 ... Struts, 19 ... Bolts, nuts 20 ... Outward hook type engaging pieces , 20a, 22a ... Horizontal portions 20b, 22b ... Bending piece, 21 ... Horizontal plate engaging piece 22 ... Inward hook-shaped engaging piece

Claims (2)

[Claims] 1. A friction cutter material is provided on the upper surface,
A pair of outward-facing hook-type engaging pieces is projected in the length direction on one side including the tip, and a pair of inward-hook-like engaging pieces is protruded at the tip on the other side. And a pair of horizontal plate engaging pieces projecting in the lengthwise direction at the rear of the box-shaped roof tubular body. The mating piece and a pair of inward hook-shaped engaging pieces are fitted to each other, and the rear side thereof is parallel in an engaged state while inserting the hook-shaped engaging pieces between the horizontal plate engaging pieces from the starting pit to the reaching pit. It is press-fitted into the ground so that it penetrates, and an underground structure is placed in the rear part of the roof cylinder that remains in the starting pit, while the friction cutter material is left in the ground and the roof cylinder and underground structure move simultaneously. It is characterized by the fact that the roof cylinders that have come out to the arrival pit are sequentially removed, and the construction is completed when the tip of the underground structure reaches the arrival pit. How to build the structure. 2. A friction cutter material is provided on the upper surface,
On one side, a pair of inward hook-shaped engagement pieces including the tip are projected in the length direction, and on the other side, a pair of outward hook-shaped engagement pieces are projected on the tip. And a box-shaped roof cylinder having a pair of horizontal plate engaging pieces projecting in the lengthwise direction behind it, and the adjacent box-shaped roof cylinders have a pair of inward hook-shaped engagements at the tips. The mating piece and a pair of outward facing hook-type engaging pieces are fitted together, and the rear side thereof is parallel in an engaged state while inserting a horizontal plate engaging piece between the hook-type engaging pieces, from the starting pit to the reaching pit. It is press-fitted into the ground so that it penetrates, and an underground structure is placed in the rear part of the roof cylinder that remains in the starting pit, while the friction cutter material is left in the ground and the roof cylinder and underground structure move simultaneously. It is characterized by the fact that the roof cylinders that have come out to the arrival pit are sequentially removed, and the construction is completed when the tip of the underground structure reaches the arrival pit. How to build the structure.