JPH0758035B2 - 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. 7, this is made 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 having a substantially square cross section made of steel pipe, and has hook-shaped constituent members on its side faces lined outward and male joints 6a 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. 8, 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 box body 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.

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.

[Problems to be Solved by the Invention]

The roof cylinder 6 penetrates the first one from the starting pit 3 and then presses the adjacent ones side by side, and further pushes them one by one with the small jacks 12 in a parallel state.
At this time, the bending may cause an opening between the roof cylinder 6 and the mixture of earth and sand, whereby the male joint 6a and the female joint 6b may be meshed with each other more than necessary, and the push-out may not be successful.

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.

The object of the present invention is to eliminate the inconveniences of the above-mentioned conventional examples, except for the tip portion, it is possible to prevent excessive coupling between the joints of the roof cylinder and to ensure smooth extrusion, and to further extrude into the reaching hole. The purpose of the disclosed roof cylinder is to provide a method for constructing an underground structure that can be removed without cutting the joint.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention presses a box-shaped roof cylinder having a friction cutter material on the upper surface into the ground from the starting pit to make the side portions in parallel with each other in an engaged state and remain in the starting pit. A step of arranging an underground structure with a small jack interposed in the rear portion of the roof cylinder, and pushing the roof cylinder with the small jack while using the underground cutter as a reaction member while leaving the friction cutter material in the ground; , In the method of constructing a continuous underground structure by appropriately repeating the process of excavating the underground structure by the conventional construction method, adjacent box-shaped roof cylinders have a pair of ends including a tip on one side. A hook-shaped engagement piece is provided so as to project in the length direction, and a pair of hook-shaped engagement pieces that fit into the pair of hook-shaped engagement pieces are provided at the tip of the other side portion, and a pair at the rear side thereof. The horizontal plate engaging pieces of the above are projected in the length direction, and the pair of hook-shaped engaging pieces are , And at the rear of them, hook-shaped engaging pieces are inserted between the horizontal plate engaging pieces, or horizontal plate engaging pieces are inserted between the hook-shaped engaging pieces while the roof cylinders are aligned in the engaged state. The main idea is to press-fit.

[Action]

According to the present invention, only the tip of the roof cylinder having the blade opening is fitted with the outward hook-shaped engagement piece 22 and the inward hook-shaped engagement piece 22. There is no possibility that they will be separated from the tip left and right and pressed into each other.

Further, behind that, the box-shaped roof tubular body is pushed forward by using the adjacent tubular body as a guide while being restrained in the vertical direction by inserting the hook-shaped engaging pieces between the horizontal plate engaging pieces with respect to the adjacent tubular bodies. . At that time, since the hook-shaped engaging pieces are not constrained between the horizontal plate engaging pieces in the left-right direction, they do not engage with each other more than necessary even if a bend occurs in the progress and smoothly push out.

In addition, the roof cylinder extruded into the reaching shaft has no restraint in the left-right direction except the tip portion, so that 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.

FIG. 1 is a front view showing an embodiment of a method for constructing an underground structure of the present invention, and FIG. 2 is a front view of the main part of the same. The roof cylinder of the present invention will be described first. The body 6 is a box-shaped steel pipe having a substantially square cross-section with a friction cutter 7 attached to the upper surface as in the above-mentioned conventional example, but as shown in FIG. As for the body only, a pair of outward hook-shaped engagement pieces 20 are provided on one side portion and a pair of inward hook-shaped engagement pieces 22 are projectingly provided on the other side portion as in the conventional case only at the tip or the entire length. Engagement pieces 20, 21
It was made to fit each other.

And, behind it, the hook-shaped engaging piece 20 is continuously projected on one side in the lengthwise direction, and a pair of horizontal plate engaging pieces 21 is provided on the opposite side with a vertical interval. It was projected continuously in the direction.

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 by using the above-mentioned cylindrical body 6 will be described. The method itself is the same as the conventional method described in FIGS. 7 to 9 above.

As shown in FIG. 7, a retaining steel sheet pile 2 is driven beside the upper traffic 1 such as a railroad to construct a starting pit 3 and a reaching pit 4, and an extrusion mechanism and an auger by 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, presses the adjacent ones in order, and then presses them in parallel with each other while pushing them one by one with the small jacks 12 in parallel. However, at that time, only the frontmost unit cylinder having the blade is made to fit the pair of outward hook-shaped engagement pieces 20 and the pair of inward hook-shaped engagement pieces 22.

By doing so, it is possible to prevent the adjacent roof cylinders 6 from being press-fitted separately from the leading end in the left and right directions.

Further, behind that, the hook-shaped engaging piece 20 is inserted between the horizontal plate engaging pieces 21 of the adjacent tubular body 6 so that the roof tubular body 6 press-fitted first while restraining in the vertical direction is used as a guide. While pushing forward, it is finally arranged side by side.

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.

Further, the roof cylinder 6 may be shorter than the starting pit 3 to the reaching pit 4 without penetrating it.

Next, as shown in FIG. 8, 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, the underground structure 9 is used as a reaction force, and the roof cutters 6 are sequentially pushed one by one while leaving the friction cutter 7, and if the cylinders 6 are moved forward, the small jacks 12 are contracted in the future. 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
When one piece of the unit cylinder is completely exposed in the reaching pit 4 while alternately repeating the forward movement, the joint flanges 6c are unfastened by the bolts and nuts 19 and divided in the longitudinal direction. Except for the parts, they are separated by laterally shifting and 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.

As described above, the roof cylinder 6 may have a shorter length without penetrating from the starting pit 3 to the reaching pit 4, but as a further application, the roof cylinders 6 arranged in parallel reach a part first. It is also possible to accurately penetrate the pit 3 and push the tubular body 6 into which the short box body 6 is pierced to the guide.

FIG. 5 and FIG. 6 show still another embodiment, in which the friction cutter 7 is attached to the upper surface of the tubular body 6, and a pair of inward facing hooks having a vertical gap with a conventional hook-shaped joint 6b on one side surface. The mold engaging pieces 22 are continuously projected in the lengthwise direction, and the pair of horizontal plate engaging pieces 21 are continuously projected in the lengthwise direction at the opposite side portions with a vertical interval.

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, the box-shaped roof cylinder body having the friction cutter material disposed on the upper surface is press-fitted into the ground so as to penetrate from the starting pit to the reaching pit. Parts are arranged side by side in an engaged state, an underground structure is placed with a small jack in the rear part of the roof cylinder that remains in the starting pit, and the underground structure is reacted while leaving the friction cutter material in the ground. In the method of constructing a continuous underground structure by appropriately repeating the step of pushing the roof cylinder with a small jack as a member and the step of excavating the underground structure by the conventional construction method, except for the tip, the roof cylinder The joints of the body can be prevented from meshing more than necessary to ensure smooth extrusion, and the roof cylinder extruded into the narrow reaching hole can be removed without cutting the joint.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a method for constructing an underground structure and a roof tubular body of the present invention, FIG. 2 is a front view of a main part of the same, and FIG. 3 is a second embodiment of the same. A front view, FIG. 4 is a front view of the vicinity of a blade portion of a roof cylinder, FIG. 5 is a front view showing a third embodiment, and 6 is a front view of essential parts of the same, and FIGS.
Figure is a side view showing each step of construction method of underground structure, Figure 10 is a vertical sectional front view of a conventional roof cylinder, Figure 11 is a partial perspective view of the same as above, and Figures 12 to 14 are cylinders. It is a front view which shows the arrangement state of. 1 ... Upper traffic, 2 ... Soil retaining steel sheet pile 3 ... Starting pit, 4 ... Destination 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 ... Bed 16 ... Strut, 19 ... Bolt, nut 20 ... Outward hook type engagement Pieces, 20a, 22a ... Horizontal portions 20b, 22b ... Bent pieces, 21 ... Horizontal plate engaging pieces 22 ... Inward hook type engaging pieces

Claims (1)

[Claims] 1. A box-shaped roof cylinder body having a friction cutter material disposed on the upper surface thereof is press-fitted into the ground from a starting pit so that the side portions are aligned in parallel with each other, and the side portions of the roof cylinder body remain in the starting pit. Disposing an underground structure with a small jack in between, pushing the roof cylinder with the small jack while using the underground cutter as a reaction member while leaving the friction cutter material in the ground, and the underground structure is In a method of constructing a continuous underground structure by appropriately repeating the process of excavating by a conventional construction method, adjacent box-shaped roof cylinders have a pair of hook-shaped engagement pieces including a tip on one side. And a pair of hook-shaped engaging pieces that engage with the pair of hook-shaped engaging pieces at the tip end on the other side and a pair of horizontal plate engagements at the rear side. One piece protrudes in the length direction, and at the tip part, a pair of hook-shaped engaging pieces are fitted and Is characterized in that the hook type engaging pieces are inserted between the horizontal plate engaging pieces, or the horizontal plate engaging pieces are inserted between the hook type engaging pieces, and the roof cylinders are pressed in parallel while being engaged. How to build an underground structure.