JP6714060B2 - Construction method of underground structure - Google Patents

Description

The present invention relates to a method of constructing an underground structure that can be constructed without obstructing upper traffic when a large number of underground structures such as railways and roads are excavated in the transverse direction. is there.

In order to excavate a large number of underground structures in the lower ground such as railways and roads in the transverse direction, protective work is required to support upper traffic, and a pipe roof that horizontally arranges pipes and the like should be provided. And so on.

However, as a separate work, a pipe roof was formed first, and the bottom and inside of the pipe roof were excavated to build an underground structure, or the underground structure was made to dig under the pipe roof. The soil cover becomes thicker as much as it exists. Moreover, the protection work for pipe roof construction is different from the main work for burying underground structures, and the construction cost and construction period are large.

As a solution to such inconvenience, the inventors of the present invention press-fit the box-shaped roof as shown in the following patent document, and when propelling the concrete box, the sand of the face of the face and the box-shaped roof are promoted together with the promotion of the box. Since they are pushed out together, there is no need to separately excavate the face, cost and construction period can be reduced, and safety can be improved by eliminating the dangerous face excavation work. By distributing the reaction force resistance to propel the box, we applied for a construction method for an underground structure that does not require large-scale equipment, and obtained a patent right.
Japanese Patent No. 4134089 Japanese Patent No. 4317843 Japanese Patent No. 3887383

This method is named SFT method and is also described in Non-Patent Document 1 below. The SFT method is an abbreviation for "Simple and Face-Less Method of Construction of Tunnel".
Website of Uemura Giken Kogyo Co., Ltd., an internet website http://www.uemuragiken.co.jp/tech/sft.html

In the SFT method, as the first step, as shown in FIG. 8, a retaining steel sheet pile 2 is driven beside an upper traffic (not shown) such as a railroad, and a starting pit 3 and a reaching pit 4 are built, The propulsion device 5 is installed in the starting pit 3 so that the box-shaped roof 6 as the roof cylinder is press-fitted toward the reaching pit 4. The friction cutter plate 7 is placed on the upper surface of the box-shaped roof 6 and is pushed out together with the box-shaped roof 6.

As shown in FIG. 12, the box-shaped roof 6 is a box-shaped tubular body having a rectangular cross section, and has hook-shaped or flat-plate shaped joints 6a and 6b formed continuously on the side surface in the longitudinal direction, and a flat plate formed on the upper surface. The friction cutter plate 7 is attached. The box-shaped roof 6 has flanges for connecting bolts formed at the front and rear ends, and can be sequentially connected in the length direction to bury a required length. Further, the box-shaped roof 6 is connected in parallel in the vertical and horizontal directions via joints 6a and 6b. Let

Although detailed illustration of the propulsion device 5 is omitted, the box-shaped roof 6 is advanced by pushing out the earth and sand discharge pipe as an extruding body with the original push jack, and the tip face of the box-shaped roof 6 is excavated by a human-powered excavation blade. In addition to the case where an excavating mechanism such as an auger screw is provided, there is a case where the excavating mechanism is provided.

The box-shaped roof 6 is arranged in a quadrangular shape so as to correspond to the outer shape of the concrete box 9 to be propelled, and the soil retaining member 19 is arranged in the face part surrounded by the arrangement of the box-shaped roof 6.

In the figure, numeral 17 is a bellows member, and is fixed by a tie-lot member 28 that joins the earth retaining steel sheet pile 2 on the side of the starting pit 3 and the earth retaining steel sheet pile 2 on the side of the reaching pit 4. Reference numeral 20 indicates a starting stand.

Next, as shown in FIG. 9 in the second step, the concrete box 9 is installed in the starting pit 3, and the pre-installed jack 10, the strut 16 as the propulsion equipment are installed between the concrete box 9 and the reaction wall 8 behind the concrete box 9. The cross frame 22 is provided.

Then, the friction cutter plate 7 is fixed to the starting pit 3 side by the stopper member 14. The friction cutter plate 7 cuts the edge of the box-shaped roof 6 and the concrete box 9 from the surrounding earth and sand.

Next, the front end of the concrete box 9 is joined to or brought into contact with the rear end of the box-shaped roof 6 extruded in advance, and as a third step, the original push jack 10 is extended to expand the concrete. The box 9 is pushed forward.

At the same time as the concrete box 9 is extruded, the box-shaped roof 6 is also extruded, and the face portion is not excavated. When the box-shaped roof 6 is extruded, the earth retaining member 19 disposed in the portion surrounded by the box-shaped roof 6 at the same time is extruded. By extruding, the earth and sand 24 in front of it is also extruded at the same time. In this case, since the box-shaped roof 6 and the concrete box 9 are cut off from the surrounding earth and sand by the friction cutter plate 7 as described above, the box-shaped roof 6 and the concrete box 9 are smoothly propelled.

In this way, as the fourth step, as shown in FIG. 11, if the box-shaped roof 6 and the earth and sand 24 surrounded by the box-shaped roof 6 and simultaneously extruded reach the reaching pit 4, the box-shaped roof 6 is formed in the reaching pit 4. At the same time that the roof 6 is removed, the earth and sand 24 are excavated and discharged.

In this removal, the box-shaped roof 6 is dismantled inside the reaching pit 4, the crane is pulled up above the reaching pit 4, and the earth and sand are discharged above the reaching pit 4 by a shovel such as a backhoe.

Then, the propelling of the entire concrete box 9 is completed by further propelling the tip of the concrete box 9 until reaching the reaching pit 4.

In the SFT method, the box-shaped roof 6 is also extruded at the same time as the concrete box 9 is extruded, and the face portion is not excavated. At the same time when the box-shaped roof 6 is extruded, a portion surrounded by the box-shaped roof 6 is extruded. Although the earth retaining member 19 thus arranged is extruded at the same time as the earth and sand in front of it, the box-shaped roof 6 has a gap due to the joint when the box-shaped roof 6 is arranged side by side.

Then, among the rows of the box-shaped roofs 6 arranged in a rectangle, especially in the row of the box-shaped roofs 6 located in the lower stage, the earth and sand surrounded by the box-shaped roofs 6 fall into this gap and enter the earth and sand. The whole is loosened, and the earth and sand surrounded by the box-shaped roof 6 and extruded at the same time are easily loosened, resulting in a very unstable state, which is not preferable.

The box-shaped roof 6 has hook-shaped or flat-plate shaped joints 6a and 6b continuously formed on the side surface in the longitudinal direction, and is arranged side by side in the longitudinal and lateral directions through the joints 6a and 6b. , 6b are at the back position and do not block the mutual space of the box-shaped roof 6.

The object of the present invention is to eliminate the inconvenience of the above-mentioned conventional example, by arranging a box-shaped roof so as to correspond to the outer shape of the box body to be propelled from the starting pit to the reaching pit, from the starting pit or the reaching pit. After press-fitting into the ground, a box is placed at the end of the box roof, and when the box roof is assembled, the earth and sand inside the box roof are pushed out together with the box roof. Provide a construction method for an underground structure that can easily and reliably prevent earth and sand surrounded by box roof rows from entering the gap between the box roofs in the gaps between the box roofs for stable construction. Especially.

In order to achieve the above-mentioned object, the present invention according to claim 1 is such that a hook-shaped or flat-shaped joint is continuously formed in the longitudinal direction on the side surface so as to correspond to the outer shape of the box body to be propelled from the starting pit to the reaching pit. After arranging the box-shaped roof formed as described above and press-fitting it into the ground from the starting or reaching pit, place the concrete box at the end of this box-shaped roof, and promote the concrete box to form the box-shaped roof. In the method of constructing an underground structure that pushes out the built-in earth and sand together with the box-shaped roof, the box-shaped roofs arranged in at least the lower row of the box-shaped roofs arranged in a rectangular shape corresponding to the outer shape of the concrete box. The gist of the roofs is that the roofs are closed by a sand/sand eave that closes the upper opening of the mutual space located above the joint .

According to the present invention as set forth in claim 1, the box-shaped roofs arranged at least in the lower row of the box-shaped roofs arranged in a quadrangular shape so as to correspond to the outer shape of the concrete box close the upper opening of the mutual space. Since it is closed by the protection eaves, the sediment can be prevented from entering the mutual space of the box-shaped roof.

The gist of the present invention according to claim 2 is that the eaves and sand eaves eaves are formed by providing a hook-shaped joint at the outer peripheral upper corner of the box-shaped roof and superposing the hook-shaped joint.

According to the second aspect of the present invention, it is possible to easily form the earth and sand protection eaves by providing a hook-like joint and overlapping the same. Further, there is no problem in pushing the box-shaped roofs one by one so as to correspond to the outer shape of the box and arranging them.

The gist of the present invention according to claim 3 is that the eaves and sands for preventing sand are formed by overlapping the plate-like members mounted on the box-shaped roof at the projecting ends from the box-shaped roof. Is.

According to the third aspect of the present invention, in order to form the earth and sand protection eaves, the projecting end portions of the plate body mounted on the box-shaped roof can be easily formed. Further, there is no problem in pushing the box-shaped roofs one by one so as to correspond to the outer shape of the box and arranging them.

As described above, the construction method of the underground structure of the present invention is such that the box-shaped roof is assembled and arranged so as to correspond to the outer shape of the box body to be propelled from the starting pit to the reaching pit, and the starting pit or the reaching pit. After press-fitting from the pit into the ground, a box is placed at the end of the box roof, and the underground structure is constructed by pushing the box roof together with the box roof to push out the earth and sand inside the box roof. According to the method, the earth and sand surrounded by the box-shaped roof rows can easily and surely be prevented from entering the gaps between the box-shaped roofs in the gaps between the box-shaped roofs, and stable construction can be performed.

It is a front view which shows 1st Embodiment of the construction method of the underground structure of this invention. It is a front view of the principal part which shows 1st Embodiment of the construction method of the underground structure of this invention. It is a front view of the box-shaped roof used by 1st Embodiment of the construction method of the underground structure of this invention. It is a front view which shows 2nd Embodiment of the construction method of the underground structure of this invention. It is a front view of the principal part which shows 2nd Embodiment of the construction method of the underground structure of this invention. It is a front view of the box-shaped roof used by 2nd Embodiment of the construction method of the underground structure of this invention. It is a front view of the box-shaped roof lined up and down in the construction method of the underground structure of the present invention. It is a vertical side view showing the 1st process of the construction method of the underground structure by the SFT method. It is a vertical side view showing the 2nd process of the construction method of the underground structure by SFT method. It is a vertical side view showing the 3rd process of the construction method of the underground structure by SFT method. It is a vertical side view showing the 4th process of the underground structure by the SFT method. It is a front view of a box-shaped roof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the construction method of the underground structure of the present invention, similar to the SFT construction method, as the first step, as shown in FIG. 8, from the earth retaining steel sheet pile 2 such as a sheet pile beside an upper traffic (not shown) such as a railway. A temporary earth retaining pile is placed to build a starting pit 3 and a reaching pit 4, a starting table 20 is formed in the starting pit 3 by placing rubble stones and base concrete, and a propulsion device 5 is installed to use it for the roof. The box-shaped roof 6 which is a cylinder is pressed into the reaching pit 4.

The box-shaped roof 6 is basically a box-shaped cylindrical body having a rectangular cross section as shown in FIG. 12, flanges for bolting are formed at the front and rear ends (not shown), and they are sequentially connected in the longitudinal direction. The required length can be buried.

The box-shaped roof 6 has hook-shaped or flat-plate shaped joints 6a and 6b formed continuously on the side surface in the longitudinal direction, and a friction cutter plate 7 made of a flat plate is attached to the upper surface.

In the case where the friction cutter plate 7 is welded at one end to the end of the box-shaped roof 6 and integrated, and the rest is simply placed, the box-shaped roof 6 is sequentially connected in the longitudinal direction. The friction cutter plates 7 themselves are connected to each other by welding or the like to be continuous.

The box-shaped roof 6 is arranged in a quadrangular shape so as to correspond to the outer shape of the concrete box 9 to be propelled. At this stage, earth and sand 24 are present inside the box-shaped roof 6. (See Figure 9)

According to the present invention, the box-shaped roofs 6 arranged in a square shape so as to correspond to the outer shape of the concrete box 9 are arranged at least in the lower row, and the joints are formed by hook-shaped (L-shaped) angle members at the outer peripheral upper corners. 30 is provided and the sand protection eaves 31 is formed on the side surface of the box-shaped roof 6 by superimposing the same to the mutual space of the box-shaped roof 6 located above the hook-shaped or flat-plate shaped joints 6a, 6b . It was formed along the upper opening.

The joint 30 has substantially the same length as the box-shaped roof 6, and is attached by welding or the like so that the horizontal portion projects outward along the upper outer corner of the box-shaped roof 6 as shown in FIG. Plate-shaped joints 6a and 6b are provided.

In this manner, when the box-shaped roofs 6 are press-fitted one by one toward the reaching pit 4 by the propulsion device 5, the box-shaped roofs 6 arranged in rows and facing each other overlap each other at the horizontal portions of the joints 30 to prevent sand. The eaves 31 is formed.

As shown in FIG. 9, the front end of the concrete box 9 is joined to or brought into contact with the rear end of the box-shaped roof 6 that has been extruded in advance, and as a fifth step, the original push jack 10 is attached as shown in FIG. The concrete box 9 is extended and pushed forward.

At the same time as the concrete box 9 is extruded, the box-shaped roof 6 is also extruded, and the face portion is not excavated. When the box-shaped roof 6 is extruded, the earth retaining member 19 disposed in the portion surrounded by the box-shaped roof 6 at the same time is extruded. By extruding, the earth and sand 24 inside the box-shaped roof 6 is also extruded at the same time.

In this case, since the box-shaped roof 6 and the concrete box 9 are cut off from the surrounding earth and sand by the friction cutter plate 7 as described above, the box-shaped roof 6 and the concrete box 9 are smoothly propelled.

The sand 24 inside the box-shaped roof 6 does not enter the mutual space of the box-shaped roof 6 due to the sand prevention eaves 31.

In addition, among the box-shaped roofs 6 arranged in a square shape so as to correspond to the outer shape of the concrete box 9, as for the box-shaped roofs 6 arranged in a row, as shown in FIG. By interposing several rows side by side, stable extrusion can be performed.

In this way, as a sixth step, as shown in FIG. 11, if the box-shaped roof 6 and the earth and sand 24 surrounded by the box-shaped roof 6 and extruded at the same time reach the reaching pit 4, the box-shaped roof 4 is formed at the reaching pit 4. The roof 6 is disassembled into pieces and removed, and at the same time, the earth and sand 31 are excavated and discharged.

4 to 6 show a second embodiment of the present invention, in which the earth and sand prevention eaves 31 has a plate body 33 made of steel placed on the box-shaped roof 6, and left and right side ends of the plate body 33. Since the portion 33a protrudes from the box-shaped roof 6, the protruding end portions 33a are overlapped with each other to form the earth and sand protection eaves 31.

The plate member 33 made of steel has almost the same length as the box-shaped roof 6, and the left-right width is larger than the width of the box-shaped roof 6.

The left and right ends 33a of the plate 33 may be bent and floated so that they can be easily overlapped with each other.

The plate body 33 may be simply placed on the box-shaped roof 6, but if the tip portion is fixed to the tip of the box-shaped roof 6 by welding or the like, the plate body 33 can be put together when the box-shaped roof 6 is pushed. It can be stably pushed out.

In this manner, the protruding end portion 33a of the plate member 33 placed on the box-shaped roof 6 is overlapped with the protruding end portion 33a from the box-shaped roof 6 to form the earth and sand protection eaves 31 and thereby the box-shaped roof 6 is enclosed. The earth and sand 24 inside the box does not enter the mutual space of the box-shaped roof 6.

2 Earth retaining steel sheet pile 3 Start pit 4 Reaching pit 5 Propulsion machine 6 Box-shaped roof 6a, 6b Flat plate joint 7 Friction cutter plate 8 Reaction force wall 9 Concrete box 10 Original push jack 14 Stop member 16 Strut 17 Raised member 19 Soil retaining member 20 Starting stand 22 Cross girder frame 24 Sediment 28 Tie rod material 30 Joint 31 Sand protection eaves 32 Spacing material 33 Plate 33a End

Claims (3)

A box-shaped roof, which has hook-shaped or flat-plate joints continuously formed in the longitudinal direction on the side to correspond to the outer shape of the concrete box to be propelled from the starting pit to the reaching pit, is arranged and assembled. After press-fitting into the ground from the pit or the reaching pit, a concrete box is placed at the end of this box roof, and with the promotion of the concrete box, the sand inside the box roof is assembled and pushed out together with the box roof. In the method of constructing an underground structure, at least the box-shaped roofs arranged in the lower row of the box-shaped roofs arranged in a quadrangle so as to correspond to the outer shape of the concrete box are located above the joint. A construction method for an underground structure, which is characterized in that it is closed by an eaves for preventing sediment from closing the opening. The method for constructing an underground structure according to claim 1, wherein the eaves and sands eaves are formed by providing hook-shaped joints at the upper corners of the outer periphery of the box-shaped roof and superposing them. The method for constructing an underground structure according to claim 1, wherein the earth-and-sand prevention eaves are formed by superposing the projecting end portions of the plate body mounted on the box-shaped roof from the box-shaped roof.

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