JP2012026112A - Execution method of underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need of a vertical shaft in a bank construction part and to eliminate the need of an earth-retaining wall on a traverse part front surface, in an execution method (SFT construction method) of an underground structure for press-fitting a box-shaped roof and then extruding soil together with the box-shaped roof along with the driving of a concrete box body.SOLUTION: In the execution method of an underground structure for assembling and arranging the box-shaped roof 4 in the rectangular array of a lower stage, a side part and an upper stage so as to correspond to the outer shape of the concrete box body 5 to be driven, press-fitting it underground, then arranging the distal end part of the box body at the end part of the box-shaped roof 4, and extruding soil 11a of a face part together with the box-shaped roof 4 along with the driving and traction of the box body, the lower stage of the box-shaped roof 4 is installed beforehand, a timber support 12 for supporting the upper stage of the box-shaped roof 4 is assembled near both ends in the length direction of the box-shaped roof 4 on the lower stage of the box-shaped roof 4, the side part and upper stage of the box-shaped roof 4 are installed, and the soil inside the box-shaped roof 4 is extruded together with the box-shaped roof 4 along with the driving and traction of the concrete box body 5.

Description

  The present invention relates to a method for constructing an underground structure that can be constructed without hindering the upper traffic when excavating and constructing a significant underground structure in a lower ground such as a railway or a road. is there.

  In order to excavate a large number of underground structures in the lower ground such as railroads and roads in the transverse direction, a protective work is required to support the upper traffic, and a pipe roof that horizontally aligns steel pipes, etc. is provided. Can be given.

  However, if a pipe roof was first formed as a separate construction and an underground structure was constructed by excavating the bottom or inside of the pipe roof, or the underground structure was advanced under the pipe roof, this pipe roof would be The earth covering becomes thick as much as it exists. Moreover, the protective work for pipe roof construction is separate from the main construction for underground structure burial, and the construction cost and construction period are large.

In order to eliminate such inconvenience, the present inventors, as shown in the following patent document, press the box-shaped roof and then propel the concrete box. Because it extrudes together, it does not require additional work to excavate the face part, can reduce costs and shorten the work period, and can also improve safety by omitting the face part excavation that involves danger, By distributing the reaction force resistance for propelling the box, we applied for a construction method for an underground structure that does not require large-scale equipment, and obtained a patent.
Japanese Patent No. 4134089 Japanese Patent No. 4317843

This construction method is named SFT construction method and is also published in Non-Patent Document 1 below. Note that the SFT method (Simple and Face-Less Method of Construction of Tunnel) is an abbreviation for “construction method of a tunnel that is simple and has no face”.
Homepage of Uemura Giken Kogyo Co., Ltd., an internet website http://www.uemuragiken.co.jp/tech/sft.html

  In the SFT method, as shown in FIG. 15, as shown in FIG. 15, a temporary earth retaining pile 1 made of earth retaining steel sheet piles such as a sheet pile is placed beside an upper traffic such as a railway (not shown), and a start pit 2 The reaching pit 3 is constructed, a propulsion device is installed in the start pit 2, and the box roof 4, which is a roof cylinder, is press-fitted toward the reaching pit 3. FIG. 16 shows the stage where the press-fitting is completed and the concrete box 5 is installed.

  The box-shaped roof 4 is a steel cylinder body having a substantially square cross section, and a flange-like joint is continuously formed in the longitudinal direction on the side surface, and a friction cutter plate made of a steel plate is attached to the upper surface. The box-shaped roof 4 can be sequentially connected in the length direction to embed the required length, and is further arranged in parallel while being continuous in the vertical and horizontal directions via a hook-shaped joint.

  As shown in FIG. 18, the box-shaped roof 4 is arranged in a quadrangular shape so as to correspond to the outer shape of the concrete box 5 to be propelled, and the earth retaining member 6 is placed on the face portion surrounded by the box-shaped roof 4. Arrange. The earth retaining member 6 is fixed by a tie rod material 8 that joins the belly raising material 7 and the temporary earth retaining pile 1 on the start pit 2 side to the temporary earth retaining pile 1 on the arrival mine 3 side. The temporary earth retaining pile 1 is mirror-cut and used as the earth retaining steel sheet pile 10.

  As shown in FIG. 16, a start base 9 is formed on the start pit 2, a concrete box 5 is installed on the start base 9 of the start pit 2, and then the concrete box is placed at the rear end of the box roof 4 which has been extruded in advance. The tip of 5 is joined or brought into contact.

  The concrete box 5 is propelled and towed. The box roof 4 is pushed out at the same time as the concrete box 5 is pushed and pulled, and the face is not excavated. By pushing out the retaining steel sheet pile 10 which is disposed in the portion surrounded by the box-shaped roof 4 and fixed to each other by the tie-lot material 7, the soil in front of it is also extruded.

  In this way, as shown in FIG. 17, as the fourth step, when the box roof 4 and the earth and sand simultaneously extruded while being surrounded by the box roof 4 have reached the arrival shaft 3, the box roof is formed in the arrival shaft 3. At the same time that 4 is removed, the soil is excavated and discharged.

  In addition, although illustration is abbreviate | omitted, a propulsion jack and a strut are arrange | positioned as a propulsion equipment between the rear part of a box, and the reaction force wall of the back of a box by propulsion and traction of the said concrete box 5. The traction cable is equipped with a front reaction wall of the box, and a fixing device or traction jack is attached to the rear of the box, and one end of the traction cable is attached to the fixing device or traction jack. The other end is fixed to a traction jack or fixing device fixed to the reaction force wall, and the traction jack is pulled. Propulsion and traction of the concrete box 5 may be performed using either one or both of the propulsion and traction.

  In addition, when a friction cutter plate is stacked on the upper surface or side surface of the box-shaped roof 4, the friction cutter plate has an end near the wellhead when the box-shaped roof 4 is pushed out at the same time as the concrete box 5 is propelled or pulled. By stopping and leaving this, the box-shaped roof 4 or the concrete box 5 and the surrounding earth and sand can be cut off.

  In this way, in the SFT method, the earth and sand in the construction section is pushed out with the box roof and shaft both ends closed, and when the box is propelled, ground excavation at the face is not performed. Is the biggest feature.

  However, in this construction method, the temporary earth retaining pile 1 made of earth retaining steel sheet piles is placed to construct the start pit 2 and the arrival pit 3 as work bases, and a retaining wall is required in front of the crossing point.

  The purpose of the present invention is to push a box-shaped roof and then push the concrete box, and push the earth and sand together with the box-shaped roof to push the box. It is possible to reduce the work period and the construction period, and to improve safety by omitting the dangerous facet excavation work, and by distributing the reaction force resistance for propelling the box, The construction method of underground structures that do not require equipment (SFT method) is further evolved to eliminate the need for shafts in the SFT work at the embankment. When installing the building, it was necessary to provide a retaining wall in front of the crossing location.

  In order to achieve the above-mentioned object, the present invention according to claim 1 is configured such that box-shaped roofs are assembled and arranged in a rectangular arrangement of a lower stage, a side part, and an upper stage so as to correspond to the outer shape of a box to be propelled. In the construction method of the underground structure, after press-fitting into the ground, place the tip of the box at the end of the box-shaped roof and push the earth and sand together with the box-shaped roof together with propelling and towing the box. Install the lower roof in advance, assemble supporters that support the upper roof of the box roof near the ends of the box roof length on the lower roof of the box roof, install the side and upper boxes of the box roof, The gist is to push the earth and sand of the face part together with the box-shaped roof together with the propulsion and traction of the body.

  The present invention as set forth in claim 2, wherein the box-shaped roof is assembled and arranged in a rectangular arrangement of the lower, side, and upper stages so as to correspond to the outer shape of the box to be propelled, and then press-fitted into the ground, In the construction method of an underground structure where the tip of the box is placed at the end of the roof and the earth and sand are pushed out together with the box roof while propelling and pulling the box, the lower and side boxes of the box roof are installed in advance. Assembling a support to support the upper box roof near the both ends of the box roof length direction on the lower box roof, install the upper box roof, and put the earth and sand together with the box propulsion and towing the box roof The main point is to extrude together.

  According to the third aspect of the present invention, the upper load is supported by the upper box-shaped roof, and the upper box-shaped roof is supported by the existing ground and the support at both ends in the length direction of the box-shaped roof. The gist is to support the lower box-shaped roof.

  According to the present invention, first, as a feature of the conventional underground structure construction method (SFT method), the sand and sand of the face part is pushed out together with the box-shaped roof at the tip of the box. Propulsion and traction can be performed at the same time, and the existing excavation process of the face part between the process of propelling the box-shaped roof and the process of the box can be omitted, thereby reducing the construction cost and the construction period. In addition, the safety of construction is improved by eliminating the excavation work of the dangerous face part.

  Also, since the earth and sand are pushed out together with the box roof together with the box propulsion and traction, the reaction force resistance to move the box is dispersed compared to the case of box promotion alone or traction alone. The reaction force body in one place may be small. This eliminates the need for an auxiliary construction method such as ground improvement required when the resistance earth pressure is insufficient, and the cost and the number of construction days for performing the auxiliary construction method can be reduced.

  In addition to this, a vertical shaft is not required, and it is possible to eliminate the provision of a temporary earth retaining pile in front of the vertical shaft, and a tie rod construction for suppressing the vertical shaft retaining is not required, so that the inside of the shaft and the excavation work are unnecessary.

  As described above, in the construction method of an underground structure of the present invention, when a concrete box is pushed after press-fitting a box-shaped roof, earth and sand are pushed out together with the box-shaped roof as the box is pushed. There is no need for excavation work, cost reduction and construction period can be shortened, and safety can be improved by omitting dangerous facet excavation work. Distributing force resistance eliminates the need for large-scale equipment, eliminates the need for vertical shafts, eliminates the need for suppressing loosening of ground due to temporary earth retaining, etc., and can reduce work period and cost. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1-7 is a side view of each process which shows one Embodiment of the construction method of the underground structure of this invention, The same referential mark was attached | subjected to the same component as FIGS. 15-17 which show the said prior art example. Is.

  In the figure, 11 is a embankment, and although it is not shown, upper traffic such as a railroad or a road is provided above, and an underground structure such as a tunnel is constructed so as to cross directly below.

  The equipment will be described first. In the figure, reference numeral 1 denotes a temporary earth retaining pile, which is placed as necessary, and is not necessary depending on the road plan section.

  In the present invention, the construction of the start pit 2 and the arrival pit 3 as in the conventional example is omitted. In the figure, reference numeral 4 denotes a box-shaped roof, which is a steel box-shaped cylinder having a substantially square cross section. The box-shaped roof 4 is formed with joint flanges at the front and rear ends and connected by bolting sequentially in the length direction to obtain the required length. Can be connected via a joint.

  The concrete box 5 can be continuously connected by connecting several columns in an appropriate manner and fastened with a joining means such as a long bolt. The corner box is formed as a rectangular cylinder with the lower floor plate, left and right side plates, and upper floor plate of reinforced concrete. The part was formed as a haunch.

  As shown in FIGS. 9 and 14, the box-shaped roof 4 is arranged in a square shape of a lower stage α, left and right side parts β, and an upper stage γ so as to correspond to the outer shape of the concrete box 5.

  In the figure, reference numeral 12 denotes a support work using a steel material such as an H-shaped steel. As shown in FIG. 8, a column material 12a as a vertical member and a beam material 12b as a horizontal member are framed by fastening bolts or the like. . Further, as shown in FIG. 9, the beam member 12b can be shortened by cutting an end portion or the like.

  Next, the construction method of the underground structure of this invention is demonstrated. As shown in FIG. 1, a temporary earth retaining pile 1 is placed as necessary, but this is not necessary depending on the road plan section.

  As described above, the present invention eliminates the construction of the conventional start pit and the arrival pit, and the box-shaped roof 4 is provided with the lower α portion corresponding to the outer shape of the box to be propelled. The box-shaped roof 4 is installed side by side in advance.

  The box-shaped roof 4 is installed by forming a starter base 9 where a propulsion device (not shown) is installed to press-fit the box-shaped roof 4 as a roof cylinder, and penetrate the embankment 11. The tip is projected to the opposite side of the embankment 11.

  A box roof 12 is assembled on the lower stage α of the box roof 4 in the vicinity of both ends in the length direction of the box roof 4 (parts extending from the embankment 11), and the box roof 12 is disposed thereafter by the tower 12 4 upper stage γ is supported.

  Similarly to the lower stage α of the box roof 4, the upper stage γ of the box roof 4 is also press-fitted by installing a propulsion device on the starter base 9.

  Regarding the left and right side portions β of the box-shaped roof 4, the following three installation methods are possible, and any of them may be used.

  First, as shown in FIG. 14, as a first plan, the lower side α portion of the box-shaped roof 4 is arranged side by side and the left and right side portions of the box-shaped roof 4 are assembled before the support 12 is assembled. β is placed, and then the support 12 is installed inwardly surrounded by the lower α portion of the box roof 4 and the left and right side β portions of the box roof 4. Finally, the support 12 is supported by the support 12. This is a method of installing the upper stage γ of the box-shaped roof 4.

  As a second plan, as shown in FIG. 8 and FIG. 9, the box-shaped roof 4 is arranged with the lower stage α portion arranged side by side with the box-shaped roof 4 side by side, and the support work 12 is assembled. This is a method in which the left and right side parts β of the box-shaped roof 4 are disposed after being supported and installed by the supporter 12.

  As a third plan, a box roof 4 lower stage α is installed in advance, and a support 12 supporting the box roof upper stage is assembled on the box roof lower stage α in the vicinity of both ends of the box roof length direction. This is a method of installing the side part β and the upper stage γ of the roof.

  In either case, the upper load is supported by the box roof 4 of the upper stage γ, and the box roof 4 of the upper stage γ is supported by the support 12 at both ends in the length direction of the ground and the box roof 4. The support 12 is supported by the lower roof box 4.

  The box-shaped roof 4 is assembled and arranged in a rectangular arrangement of the lower stage α, the side part β, and the upper stage γ so as to correspond to the outer shape of the concrete box 5 to be propelled in this way, and then press-fitted into the ground. The tip of the concrete box 5 is arranged at the end of the shaped roof 4, and the earth and sand at the face part is pushed out together with the box-shaped roof 4 as the concrete box 5 is propelled and pulled.

  In the case of propulsion, propulsion and traction of the concrete box 5 is a propulsion system in which a push jack and a strut are disposed on the start stand 9 behind the concrete box 5.

  In the case of traction, a traction jack is provided on the reaction wall, and the other end of the traction cable having one end attached to the traction jack is fixed to a fixing device attached to the rear portion of the concrete box 5. A center hole jack can be used for the towing jack, and the fixing device consists of a cone and a fixing plate. The traction jack and the fixing device are exchanged, a traction jack is attached to the rear part of the concrete box 5, and the other end of the traction cable having one end attached to the traction jack is fixed to the fixing device fixed to the reaction force wall. May be.

  4 and 5 show the process of pushing the earth and sand of the face part together with the box-shaped roof 4 together with the propulsion and traction of the concrete box 5, and the earth and sand 11a surrounded by the box-shaped roof 4 of the embankment 11 is It moves together with the box roof 4 and the support work 12.

  The box-shaped roof 4 protruding to the opposite side of the embankment 11 (the arrival work yard side) is sequentially cut and removed / recovered, but the support work 12 is replaced inside. Note that whether or not the box-shaped roof 4 is removed in the middle is selected depending on whether there is a restriction on the arrival work yard.

  In this way, when the concrete box 5 is dug under the embankment 11 as shown in FIG. 6, the box-shaped roof 4 and the support 12 are removed together with the extruded earth and sand 11a as shown in FIG. Then, the mounting portion 13 and the retaining wall are built to complete the construction.

It is a side view of the 1st process which shows one Embodiment of the construction method of the underground structure of this invention. It is a side view of the 2nd process which shows one Embodiment of the construction method of the underground structure of this invention. It is a side view of the 3rd process which shows one Embodiment of the construction method of the underground structure of this invention. It is a side view of the 4th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a side view of the 5th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a side view of the 6th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a side view of the 7th process showing one embodiment of the construction method of the underground structure of the present invention. It is the CC sectional view taken on the line of FIG. It is the DD sectional view of FIG. It is the EE sectional view taken on the line of FIG. It is the FF sectional view taken on the line of FIG. It is the GG sectional view taken on the line of FIG. It is the HH sectional view of FIG. It is explanatory drawing which shows an example of the construction order of the construction method of the underground structure of this invention. It is a side view which shows the 1st process of a prior art example. It is a side view which shows the 2nd process of a prior art example. It is a side view which shows the 3rd process of a prior art example. It is the AA sectional view of FIG. It is the BB sectional view of FIG.

DESCRIPTION OF SYMBOLS 1 Temporary earth retaining pile 2 Starting pit 3 Arrival mine 4 Box-shaped roof 5 Concrete box 6 Earth retaining member 7 Waist raising material 8 Tie rod material 9 Starting stand 10 Earth retaining steel sheet pile 11 Embankment 11a Earth and sand 12 Support work 12a Pillar material 12b Beam material 13 Installation Part

Claims (3)

The box-shaped roof is assembled and arranged in a rectangular arrangement of the lower, side, and upper stages so as to correspond to the outer shape of the box to be propelled, press-fitted into the ground, and then the tip of the box on the end of the box-shaped roof In the construction method of the underground structure that places the part and pushes the earth and sand together with the box-shaped roof along with the promotion and traction of the box,
Install the lower box roof in advance,
Assembling a support to support the upper stage of the box roof near the both ends of the box roof length direction on the lower stage of the box roof,
Install the side and top of the box roof,
A construction method for underground structures, in which earth and sand are pushed out together with a box roof together with the promotion and traction of the box. The box-shaped roof is assembled and arranged in a rectangular arrangement of the lower, side, and upper stages so as to correspond to the outer shape of the box to be propelled, press-fitted into the ground, and then the tip of the box on the end of the box-shaped roof In the construction method of the underground structure that places the part and pushes the earth and sand together with the box-shaped roof along with the promotion and traction of the box,
Install the box roof bottom and sides in advance,
Assembling a support to support the upper stage of the box roof near the both ends of the box roof length direction on the lower stage of the box roof,
Install the upper box roof,
A construction method for underground structures, in which earth and sand are pushed out together with a box roof together with the promotion and traction of the box. The upper load is supported by the upper box roof,
The upper box-shaped roof is supported by the support on both ends of the existing ground and the length of the box-shaped roof,
The construction method for an underground structure according to claim 1 or 2, wherein the support is supported by a lower box roof.

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