JP4705467B2 - Construction method of underground structure - Google Patents

Description

  The present invention relates to a construction method of an underground structure in which a structure such as a continuous underground wall or a pile is provided below the tunnel when the tunnel is constructed, and a propulsion device used therefor.

  Conventionally, as described in Patent Document 1, a method of removing a part of a shield tunnel segment and constructing a continuous underground wall from the inside of the tunnel is known.

Further, as described in Patent Document 2, a continuous wall excavator for a continuous underground wall is installed inside the shield excavator, and a continuous underground wall is constructed in parallel with the tunnel excavation. The method is known.
JP-A-7-26877 JP 2004-143744 A

  However, in the construction method of the underground structure described in Patent Document 1, a part of the segment constituting the outer shell of the tunnel has to be removed, and the tunnel may be in a mechanically unstable state. .

  In addition, in the construction method of the continuous underground wall described in Patent Document 2, a shield excavator is used, but the shield excavator is propelled by using a segment assembled behind the shield excavator as a reaction force. A propulsion jack is provided, and an erector device is provided for installing a segment serving as an outer shell of the tunnel.

  And when installing a continuous wall excavator in addition to these facilities, the captain of the shield excavator becomes very long, which not only increases the production cost, but also increases the scale of the shaft and the construction of the curved part. There are problems such as being unable to do so.

  Moreover, since the core material for a segment and a continuous underground wall will be complicated in the narrow machine of a shield excavator, there exists a possibility that construction efficiency may fall very much.

  Therefore, an object of the present invention is to provide an underground structure construction method and a propulsion device that can reduce the influence on the use of the ground such as a road and that is excellent in workability.

  In order to achieve the above object, the present invention provides a method for constructing an underground structure in which a propulsion unit and an outer shell member installed behind the propulsion unit are pushed into the ground to construct a tunnel. A lower excavator for excavating the lower part from the opening, and the propulsion unit is advanced by pushing out the rear end of the outer shell member, and the rear end when the propulsion unit is advanced by a predetermined length The construction method of the underground structure is characterized in that the outer shell member is added to the bottom of the tunnel, and the structure extending in the depth direction in the ground by the lower excavator is provided below the tunnel.

  Here, the propulsion unit and the outer shell member can be removed in the order in which they are pushed from the front of the tunnel.

  Further, the lower excavator excavates the ground and mixes the cement-based injection material into the excavated portion to form a soil cement portion, and the upper portion of the soil cement portion in contact with the propulsion device A retarder that retards curing can be mixed.

  Further, the lower excavator is for excavating the ground and mixing the cement-based injection material into the excavated portion to form a soil cement portion, and in the tunnel extending direction before the soil cement portion is hardened. A core material may be inserted at intervals, and the head portions of the core material may be connected by a connecting material.

In addition, a lining part is provided in advance on the ground of the ground for constructing the tunnel, and the propulsion unit travels under the lining part, and the outer shell member installed behind the propulsion unit has a cross section of U It may be a letter shape and open upward.

  Further, the propulsion device is provided with a drilling means on the front surface and is constructed to be tunneled by being pushed out into the ground from the rear, and an opening is formed on the bottom surface of the body part behind the drilling means, and the lower part is opened from the opening. It is a propulsion machine provided with the downward excavator which excavates the ground of this, and the movable movable plant required for operation | movement of the downward excavator.

  According to the present invention configured as described above, since a propulsion device pushed out into the ground by a propulsion jack provided in a shaft or the like is used, it is not necessary to provide an erector device or the like in the aircraft, and the equipment in the aircraft is simplified it can.

  For this reason, even if the construction of the tunnel and the construction of the structure by the downward excavator are performed in parallel, the workability does not deteriorate.

Further, by removing the propulsion unit and the outer shell member, it can be reused and is economical. Furthermore, since the propulsion unit and the outer shell member are not left as obstacles in the ground, it is possible to suppress the occurrence of problems when building a building using the land again.

  Further, when the soil cement portion is formed, if the upper part on which the propulsion unit and the outer shell member slide is not hardened, the resistance to propulsion is reduced and the propulsion unit is easily pushed out.

  Furthermore, by inserting a core material into the soil cement part and connecting the head parts of the core material with a connecting material, it is possible to prevent the core material from being displaced due to sliding of the propulsion unit and the outer shell member. it can. Further, by causing the propulsion unit and the outer shell member to slide on the upper surface of the connecting material, resistance to propulsion is reduced and the propulsion unit is easily pushed out.

Moreover, by covering the ground surface with a lining part and using an outer shell member having a U-shaped cross section, a necessary member can be easily supplied into the tunnel by removing a part of the lining part. .

  Moreover, if it is a propulsion machine provided with the movable plant required for operation | movement of a downward excavator, it is not necessary to provide plant facilities on the ground, and the occupation area on the ground can be reduced.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In the construction method of the underground structure of the present embodiment, a method of constructing the continuous underground wall 8 as a structure under the tunnel 1 will be described.

As shown in FIG. 1, the tunnel 1 includes a propulsion unit 2 and a U-shaped steel shell 4 as an outer shell member installed behind the propulsion unit 2 in the ground by propulsion jacks 5,. Built by extruding.

  This propulsion device 2 is provided with excavation cutters 2a,... As excavation means on the front surface, and the earth and sand excavated by the excavation cutters 2a,. .

  Further, a U-shaped body portion 2b having a cross-sectional view as shown in FIG. 2 is formed of a steel plate or the like behind the excavation cutters 2a,.

  And the rectangular opening part 2c extended | stretched in the advancing direction of the propulsion machine 2 is provided in the bottom face of this trunk | drum 2b, and the lower ground is excavated from this opening part 2c.

  For this reason, the chainsaw type excavator 3 is installed as a downward excavator around the opening 2c, and the cutting portion 3a is adjusted to a position where it can be inserted into the opening 2c.

  This chainsaw excavator 3 has a cutting portion 3a having a cutting bit fixed to the surface of a chain portion that rotates in an oval shape. The cutting portion 3a excavates the ground and is mixed as a cement-based injection material. Cement milk and the ground excavated are agitated to form a soil cement portion 8a in the ground.

  The chainsaw excavator 3 can be provided with a self-propelling means such as a crawler so that it can move independently from the propulsion device 2.

  In addition, as shown in FIG. 3, spacing members 11 and 11 are installed in the opening 2 c into which the cutting part 3 a is inserted, and the opening 2 c is deformed and becomes narrower and comes into contact with the cutting part 3 a. Keep it from happening. And when moving the cutting part 3a back and forth in the extending direction of the tunnel 1, the spacing members 11 and 11 are removed so that the cutting part 3a does not come into contact.

  Furthermore, a lid (not shown) can be placed on the portion of the opening 2c where the cutting portion 3a is not inserted.

  The chain saw type excavator 3 is connected to a movable plant 3b required for supplying cement milk, discharging excavated earth and sand, and supplying power via a connecting hose 3c. Keep it.

  It is preferable that the movable plant 3b is provided with wheels or the like so as to be movable, and is configured to be able to travel on the rails 4a and 4a laid in the tunnel 1.

  Further, a core material 8b such as an H-shaped steel material is inserted into the soil cement portion 8a formed by the chain saw type excavator 3 with an interval in the extending direction of the tunnel 1. The core member 8b has a unit length shorter than the inner height of the tunnel 1 and is joined in the depth direction by joining the lower end of another unit member to the upper end of the unit member inserted into the soil cement portion 8a. The desired length can be formed.

  Further, a head connecting member 8c made of a grooved steel material or the like is installed between the heads of the core members 8b and 8b to keep the space between the core members 8b and 8b, and the top surface of the head connecting member 8c is soiled. The surface is exposed from the cement portion 8a, and the surface that contacts the bottom surface when the propulsion unit 2 moves is set to be the upper surface of the head coupling member 8c.

  Thus, the continuous underground wall 8 of this Embodiment is comprised by the soil cement 8a, the core material 8b, ..., and the head connection material 8c, ....

  Further, the U-shaped steel shell 4 installed behind the propulsion device 2 is formed by combining steel plates and steel materials in a U-shaped cross section and an open top as shown in FIG.

  Further, the U-shaped steel shell 4 and the propulsion unit 2 and the U-shaped steel shells 4 and 4 are connected by connecting means (not shown), and after the connection, they move together.

  The upper part of the U-shaped steel shell 4 is covered with a lining part 7, and the lining part 7 is installed on the ground toward the extending direction of the tunnel 1, and the siding girder 7 c. , 7c and a lining girder 7b,... Bridged orthogonally, and lining plates 7a,.

  FIG. 5 is a diagram illustrating a work process for removing the propulsion unit 2 and the U-shaped steel shells 4,... From the reaching shaft 6B after the tunnel 1 is constructed up to the reaching shaft 6B.

  In this way, the propulsion unit 2 and the U-shaped steel shells 4,... Installed in the ground to construct the tunnel 1 are pulled out by the extraction jacks 13 and 13 installed in the reaching shaft 6B, and connected to the subsequent ones. It can be removed by releasing it.

  In this removal, the backfill preparation steel shell 12 is connected to the back end of the U-shaped steel shell 4 located at the rear end of the tunnel 1, and the U-type steel shell 4 is removed from the backfill preparation steel shell 12. The earth retaining materials 12c,... Such as the parent piles 12b,.

  Further, a girder receiving member 12a can be installed on a part of the main pile 12b, and the load of the lining portion 7 can be received through a spar 7c newly installed above the tunnel 1.

  Next, the work process of the underground structure construction method of the present embodiment will be described and the operation thereof will be described.

  First, a lining portion 7 as shown in FIGS. If the lining part 7 is provided in this way, it becomes possible to share the ground as a road or the like even during construction, and the occurrence of traffic congestion can be suppressed.

  And the start shaft 6A is provided in the start point of the tunnel 1, and the arrival shaft 6B is provided in the end point.

  The propulsion device 2 is started from the start shaft 6A, and the ground is excavated by the excavation cutter 2a of the propulsion device 2 and is pushed out of the start shaft 6A by the propulsion jack 5,. Advance in the ground.

  Then, at the position where the opening 2c of the propulsion device 2 is pushed out into the ground, the cutting portion 3a of the chainsaw excavator 3 is inserted into the opening 2c, and the soil is excavated and stirred to a predetermined depth to obtain a soil cement portion. 8a is formed.

  If the movable plant 3b necessary for the operation of the chainsaw excavator 3 is installed in the start shaft 6A or the tunnel 1, it is not necessary to provide plant equipment on the ground, and the occupied area on the ground can be reduced.

  When the propulsion device 2 is advanced in a state where the cutting portion 3a is extended to a predetermined depth, the soil cement portion 8a is also extended in the tunnel extending direction along with the progress. In addition, the head connecting member 8c and the core member 8b are inserted and installed at predetermined positions of the soil cement portion 8a from the opening 2c.

  The head connecting member 8c and the core member 8b can be brought in from the start shaft 6A through the inside of the tunnel 1, but the lining plates 7a,.・ ・ You can remove a part of it and start from above.

  Also, when inserting the core material 8b into the soil cement portion 8a, if a part of the lining plate 7a,... Is removed, the core material 8b longer than the height of the sky inside the tunnel 1 is inserted at a time. Is also possible.

  Then, with the propulsion device 2 being almost pushed out into the ground, the U-shaped steel shell 4 suspended in the start shaft 6A is connected to the rear end of the propulsion device 2, and the rear end of the U-shaped steel shell 4 is propelled. The propulsion device 2 is further advanced by being pushed by the jacks 5 and 5.

  Since the U-shaped steel shell 4 is supplied to the starting shaft 6A, it is not necessary to divide the U-shaped steel shell 4 like a shield tunnel segment conveyed in the tunnel, and an integral member can be used. For this reason, since workability is good and generation | occurrence | production of the junction part which becomes a weak part can be suppressed, the increase in the production cost by reinforcement of a junction part etc. can be suppressed.

  Thus, the tunnel 1 having a predetermined length is repeatedly excavated by the excavating cutter 2a,... Of the propulsion machine 2, extruded by the propulsion jacks 5,. Is constructed, and the propulsion device 2 that has reached the reaching shaft 6B is removed and collected.

  Then, the extraction jacks 13,... Are attached to the wall surface on the tunnel 1 side of the reaching shaft 6B so as to be able to extend toward the opposite wall surface, and as shown in FIG. The tip is fixed to the side surface of the U-shaped steel shell 4.

  Moreover, the steel shell 12 for backfilling preparation is inserted from the start shaft 6A, and it connects with the rear end of a U-shaped steel shell 4, ... group.

  When the extraction jacks 13,... Are extended in this state, the U-shaped steel shells 4,... Move to the reach shaft 6B side, and the backfill preparation steel shell 12 is drawn into the tunnel 1, and the tip U The U-shaped steel shell 4 at the tip is released by releasing the connection between the drawing jacks 13,... Is removed from the reaching shaft 6B.

  Further, in the tunnel 1 from which the U-shaped steel shell 4 has been pulled out, parent piles 12b,... And earth retaining materials 12c,. And backfill.

  According to the present invention configured as described above, since the propulsion unit 2 pushed out into the ground by the propulsion jacks 5... Provided in the start shaft 6A is used, there is no need to provide an erector device or the like in the plane. In-flight equipment can be simplified.

  For this reason, even if the construction of the tunnel 1 and the construction of the continuous underground wall 8 by the chainsaw excavator 3 are performed in parallel, the workability does not deteriorate. Moreover, since an underground structure can be constructed in a state where the ground is covered with the lining portion 7, the occurrence of traffic congestion can be suppressed.

  Further, by removing the propulsion unit 2 and the U-shaped steel shells 4,..., Reuse becomes possible and it is economical. Furthermore, since the propulsion unit 2 and the U-shaped steel shell 4, ... are not left as obstacles in the ground, even when someone else's land is used, the original state can be easily restored, or the land can be used again. Thus, it is possible to save the trouble of removing or avoiding obstacles when building a building.

  Further, the core material 8b,... Is inserted into the soil cement portion 8a, and the heads of the core material 8b,. It is possible to prevent the core materials 8b,... From being displaced due to sliding of the U-shaped steel shells 4,.

  Further, by making the propulsion unit 2 and the U-shaped steel shells 4,... Slide on the upper surfaces of the head connecting members 8c,..., Resistance to propulsion is reduced and the propulsion unit 2 is easily pushed out. Become. Furthermore, since the head connecting members 8c,... Serve as guides, the propulsion device 2 can be accurately advanced in a predetermined direction.

  Hereinafter, Example 1 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the first embodiment, a case where an underpass of the box culvert 25 as shown by a two-dot chain line in FIG. 6 is constructed below an intersection as shown in the plan view of FIG.

  In the first embodiment, as shown in the plan view of FIG. 7A, two start shafts 6A and 6A and arrival shafts 6B and 6B are constructed near the start point and end point of the intersection, and the start shaft 6A and the reach shaft 6B. A lining portion 7,... Is provided between the start shafts 6A and 6A and between the arrival shafts 6B and 6B.

  Then, the propulsion unit 2 provided with the chainsaw excavator 3 is started from each of the start shafts 6A and 6A, and the tunnels 1 and 1 in which the U-shaped steel shell 4 is installed by the process described in the above embodiment and continuously below the tunnels 1 and 6A. Build underground walls 8,8.

  In the first embodiment, the U-shaped steel shell 4 is not removed, but a pipe loop 22 is bridged from one tunnel 1 to the other tunnel 1 to construct a roof between the tunnels 1 and 1. Both ends of the pipe loop 22 are supported by receiving members 23 and 23 attached to the inner side surfaces of the U-shaped steel shells 4 and 4.

  The U-shaped steel shell 4 and the pipe roof 23 are filled with concrete or the like so that they can be used as a structure.

  The inner ground surrounded by the two rows of side walls formed by the U-shaped steel shell 4 and the continuous underground wall 8 and the pipe roof 22 spanned over the upper end thereof is excavated by an excavator such as a backhoe 24. In this case, a large-scale tunnel 21 space is formed.

  If the box culvert 25 is constructed of reinforced concrete or the like inside the large-scale tunnel 21 formed in this way, the box supported by the continuous underground wall 8 as shown in the sectional view of FIG. An underpass consisting of culvert 25 can be constructed.

  Thus, if it is a method of constructing an underpass under an intersection, even if it is an intersection with much traffic, a three-dimensional construction can be performed in the state shared almost without closing.

  Further, since the U-shaped steel shell 4 can be used as it is as a part of the box culvert 25 without being removed, it is possible to save time and labor for constructing the box culvert 25.

  This method can also be applied to the case where a subway station building is constructed under the road.

  Other configurations and operational effects are substantially the same as those in the above-described embodiment, and thus description thereof is omitted.

  Hereinafter, Example 2 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the second embodiment, as shown in FIG. 9, a case where an elevated road is constructed along a road above the road will be described.

  The downward excavator provided in the propulsion unit 2 used in the second embodiment is a steel pipe presser (not shown) used when a steel pipe 32 or the like is press-fitted into the ground to construct a pile.

  This steel pipe press-fitting machine is operated when the propulsion unit 2 reaches a predetermined position, and the shape of the opening 2 c provided on the bottom surface of the propulsion unit 2 is also made circular according to the shape of the steel pipe 32.

  And after installing the steel pipe 32 as a structure, the propulsion unit 2 and the U-shaped steel shell 4,... Are removed from the reaching shaft 6 </ b> B, and another steel pipe 32 is formed so as to protrude above the upper end of the steel pipe 32. While being connected, the inner space from which the U-shaped steel shells 4,... Are removed is backfilled with fluidized soil or the like to form a backfill portion 33.

  As described above, in the second embodiment, as shown in FIG. 8, the steel pipes 32,... Are erected at intervals in the extending direction of the tunnel 31, and the steel floor slab 34 is bridged over the steel pipes 32,. Thus, an elevated road as shown in FIG. 9 is constructed.

  For this reason, it is not necessary to install a steel pipe press and a plant for press-fitting the steel pipe 32 on the road, and the occurrence of traffic congestion can be suppressed.

  Moreover, since the original state is restored as the backfill part 33 except the place where the steel pipes 32,... Are installed, the installation place of the steel pipes 32,. Just avoid it.

  Furthermore, in the second embodiment, the structure in which the steel plate slab 34 is supported by one steel pipe 32 in the cross section as shown in FIG. 9 is described, but the present invention is not limited to this. A structure may be adopted in which the steel deck 34 is supported by a plurality of columns in the cross section, for example, two columns are erected and supported at intervals on both sides with the center in the middle.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment or example, and thus description thereof is omitted.

  Hereinafter, Example 3 of the above-described embodiment will be described. The description of the same or equivalent parts as those described in the above embodiment will be given the same reference numerals.

  In the third embodiment, a case where a railway in operation is continuously three-dimensional will be described.

  First, as shown in FIG. 10, the sleepers of the railway in operation are gradually replaced with the installation girders 43, and the installation girders 43, 43 are supported by the large girders 44 installed below them.

  Then, a tunnel 41 in which the U-shaped steel shell 4 is installed is constructed below the large beam 44 by the process described in the above embodiment, and a lower excavator (not shown) is used as a structure below the tunnel 41. The steel pipe pile 42 is buried. In addition, in this Example 3, although the steel pipe pile 42 is demonstrated as a structure, a continuous underground wall may be sufficient.

  The tunnel 41 and the steel pipe pile 42 are also constructed on the other side of the large beam 44, and after removing the U-shaped steel shells 4,... As shown in FIG. And backfill with.

  Then, the elevated floor slab 46 is bridged over the upper ends of the steel pipe columns 45, 45, and a rail is laid on the overhead wire column 47 thereon. , 43 and large girder 44 are removed.

  As described above, according to the method of the third embodiment, it is possible to perform continuous three-dimensional construction while continuing to operate the railway.

  Moreover, since there is nothing left behind in the ground other than the steel pipe piles 42, the possibility of using the land under the elevated railway can be expanded.

  Other configurations and functions and effects are substantially the same as those in the above-described embodiment or example, and thus description thereof is omitted.

  Although the best embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not depart from the gist of the present invention are possible. Are included in the present invention.

  For example, in the above-described embodiment or example, the U-shaped steel shell 4 having a U-shaped cross section is used as the outer shell member. However, the outer shell member is not limited to this. It may be a cross section. Further, the material is not limited to steel, and a reinforced concrete member or a prestressed concrete member can be used.

  Further, when the outer shell member having a closed cross section is used, since the tunnel is constructed in the ground away from the ground surface, it is not necessary to provide the lining portion 7.

  Moreover, in the said embodiment, although the continuous underground wall 8 was constructed over the full length of the tunnel 1, it is not limited to this, The chain saw excavator 3 is operated from the middle, for example, only under the intersection. Alternatively, the continuous underground wall 8 may be constructed. When the lower excavator is not used, the opening 2c can be covered.

  Further, when forming the soil cement portion 8a, the upper portion where the propulsion unit 2 and the U-shaped steel shell 4 slide is hard to be hardened by mixing a retarder that delays the hardening of the cement into the upper portion. The resistance to propulsion can be reduced and the propulsion device 2 can be easily pushed out.

  Furthermore, in the said embodiment, although the chainsaw type excavator 3 was comprised so that self-propelled, it is not limited to this, If it fixes to the bottom face of the propulsion machine 2, it will be able to take reaction force from the propulsion machine 2. Therefore, the weight of the chainsaw excavator 3 can be reduced.

  Moreover, in the said embodiment, although the core material 8b and the head connection material 8c were inserted from the opening part 2c of the propulsion device 2, it is not limited to this, The U-shaped steel shell 4 of the back of the propulsion device 2 is used. An opening having a sealing mechanism may be provided on the bottom surface of the (outer shell member), and the core material 8b and the like may be inserted therefrom.

It is sectional drawing of the tunnel longitudinal direction explaining the construction method of the underground structure of the best embodiment of this invention. It is sectional drawing of the propulsion machine of the AA line direction of FIG. It is a perspective view explaining the state by which the cutting part of the chainsaw type excavator was inserted in the opening part. It is sectional drawing of the U-shaped steel shell of the BB line direction of FIG. It is sectional drawing of the tunnel longitudinal direction explaining the state by the side of the attraction shaft of the construction method of an underground structure. It is sectional drawing explaining the construction method of the underground passage of Example 1. FIG. It is a figure explaining the construction method of the underpass of Example 1, Comprising: (a) is a top view of the intersection which builds an underpass, (b) is sectional drawing of the CC line direction of (a). It is sectional drawing of the tunnel longitudinal direction explaining the method of constructing the elevated road of Example 2. FIG. It is a cross-sectional view explaining the method of constructing the elevated road of Example 2. It is a cross-sectional view explaining the construction procedure of the continuous three-dimensional method of the railway of Example 3. It is a cross-sectional view explaining the construction procedure of the continuous three-dimensional method of the railway of Example 3.

Explanation of symbols

1 tunnel 2 propulsion machine 2a digging cutter (digging means)
2b Body 2c Opening 3 Chainsaw excavator (downward excavator)
3b Movable plant 4 U-shaped steel shell (outer shell member)
5 Propulsion jack 8 Continuous underground wall 8a Soil cement part 8b Core material 8c Head connection material (connection material)
21, 31, 41 Tunnel 32 Steel pipe (structure)
42 Steel pipe pile (structure)

Claims (4)

In the construction method of the underground structure that pushes the propulsion unit and the outer shell member installed behind it into the ground to construct the tunnel,
The propulsion device is provided with a lower excavator having an opening formed on the bottom surface and excavating downward from the opening,
The propulsion device is advanced by pushing out the rear end of the outer shell member, and the outer shell member is added to the rear end when the propulsion unit has advanced a predetermined length,
Below the tunnel is provided a structure extending in the depth direction in the ground by the lower excavator ,
Said propulsion unit and said shell member, a method constructing underground structures, wherein Rukoto been removed in the order in which they are pushed from the tunnel front. In the construction method of the underground structure that pushes the propulsion unit and the outer shell member installed behind it into the ground to construct the tunnel,
The propulsion device is provided with a lower excavator having an opening formed on the bottom surface and excavating downward from the opening,
The propulsion device is advanced by pushing out the rear end of the outer shell member, and the outer shell member is added to the rear end when the propulsion unit has advanced a predetermined length,
Runisaishite provided a structure is stretched in the ground in the depth direction by the front Symbol downward excavator below the tunnel, the lower excavators, a cementitious grout mixed into the drilling unit while drilling underground how to build a forms a soil cement portion, underground construction delay member for delaying the curing to the upper in contact with the propulsion unit of the soil cement portion characterized that you have been mixed Te. In the construction method of the underground structure that pushes the propulsion unit and the outer shell member installed behind it into the ground to construct the tunnel,
The propulsion device is provided with a lower excavator having an opening formed on the bottom surface and excavating downward from the opening,
The propulsion device is advanced by pushing out the rear end of the outer shell member, and the outer shell member is added to the rear end when the propulsion unit has advanced a predetermined length,
Runisaishite provided a structure is stretched in the ground in the depth direction by the front Symbol downward excavator below the tunnel, the lower excavators, a cementitious grout mixed into the drilling unit while drilling underground a forms a soil cement portion Te, the soil cement portion spaced tunnel stretching direction prior to curing the inserted core, that are linked by inter-head coupling member of the core The construction method of the underground structure characterized by this. In the construction method of the underground structure that pushes the propulsion unit and the outer shell member installed behind it into the ground to construct the tunnel,
A lining part is provided in advance on the ground of the ground for constructing the tunnel, and the propulsion unit travels under the lining part, and the outer shell member installed behind the propulsion unit has a U-shaped cross section. And the top is open,
The propulsion device is provided with a lower excavator having an opening formed on the bottom surface and excavating downward from the opening,
The propulsion device is advanced by pushing out the rear end of the outer shell member, and the outer shell member is added to the rear end when the propulsion unit has advanced a predetermined length,
A method for constructing an underground structure, characterized in that a structure extending in the depth direction in the ground by the lower excavator is provided below the tunnel.

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