JP6113778B2 - Construction method for underground structures - Google Patents

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. 19, a temporary earth retaining pile 1 made of earth retaining steel sheet piles such as a sheet pile is placed next to an upper traffic (not shown) such as a railway as shown in FIG. 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. 20 shows a state where the press-fitting is completed and the concrete box 5 is installed.

  The box-shaped roof 4 is a steel cylinder having a substantially square cross section as shown in FIG. 23, and has a flange-like joint 4a formed continuously in the longitudinal direction on the side surface, and a friction cutter made of a steel plate on the upper surface. A plate 14 is attached. 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 the flange-shaped joint 4a. Note that the friction cutter plate 14 is integrated by welding its end to the end of the box-shaped roof 4, and the rest is simply placed, and the box-shaped roof 4 is sequentially connected in the length direction. In this case, it is assumed that the friction cutter plates 14 themselves are continuously connected to each other by welding or the like.

  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 as shown in FIG. 22, 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. 20, 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 a concrete box is placed at the rear end of the box-shaped roof 4 extruded in advance. The tip of the body 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. 21, as the fourth step, if the box roof 4 and the earth and sand simultaneously extruded while being surrounded by the box roof 4 reach the arrival shaft 3, the box roof is formed at 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 the conventional SFT method, the cross section natural ground closed by the box-shaped roof 4 is integrated and punched out to replace the concrete box 5 which is the main construction. Since it is pushed out together with the box 5, the force for its propulsion becomes considerable.

  In particular, if the construction has a large cross-section and lengthening, the propulsion and towing equipment becomes large-scale, and there are cases in which construction work cannot be performed by the SFT method depending on the increase in construction cost or the situation.

  The object of the present invention is to solve the inconvenience of the conventional example, and to press the box-shaped roof and then push the concrete box to push the earth and sand of the face part together with the box-shaped roof while pushing the box. By improving the construction method (SFT method) of objects and processing without extruding the earth and sand of the face, the propulsion or towing equipment can be made smaller, and the underground can be used for large sections and lengthening construction. It is to provide a construction method for a structure.

In order to achieve the above object, the present invention according to claim 1 is characterized in that a box-shaped roof is 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 concrete box to be propelled. In the construction method of the underground structure where the tip of the box is placed at the end of the box-shaped roof and pushed together with the box-shaped roof and pushed together with the box-shaped roof, the box-shaped roof is sandwiched between The friction cutter plate that cuts the edge with the concrete box and the friction cutter plate that cuts the edge with the concrete box and wraps the earth and sand are placed on top of each other, and the friction cutter plate receiving material is placed in parallel inside the concrete box. the friction cutter plates enclosing the sediment in the friction cutter plate receiving material to support, promote and traction together with the concrete a box body Extrude the box-shaped roof, and the friction cutter plate leaves the box-shaped roof or the concrete box and the surrounding earth and sand by pushing the box-shaped roof while pushing and pulling the concrete box. The gist of the earth and sand is to cut the edge with the concrete box and to take in the concrete box together with the friction cutter plate for wrapping the earth and sand.

  According to the first aspect of the present invention, there is only a box roof together with propulsion and traction of the concrete box, and it is not necessary to take the inner earth and sand together with the friction cutter plate into the concrete box and push it out. The towing equipment can be reduced in size, and it can cope with large cross sections and lengthening of construction. In addition, this soil and sand can be taken into the concrete box together with the friction cutter plate, so that the soil can be smoothly taken in without applying frictional resistance and deformation load to the soil and sand.

In addition, if there is a difference between the internal dimensions of the concrete box and the internal dimensions of the box-shaped roof that is assembled and arranged in a rectangular array (when the internal size of the concrete box is larger), the friction cutter plate The difference can be adjusted.

According to the second aspect of the present invention, the friction cutter plate is arranged so as to sandwich the box-shaped roof, and is arranged in a rectangular arrangement of the box-shaped roof formed by combining the rectangular arrangement of the lower stage, the side part, and the upper stage. The gist is to make the part.

According to the second aspect of the present invention, the friction cutter plate for reducing the frictional resistance is not arranged on all the box-shaped roofs, but is assembled and arranged in a rectangular arrangement of the lower, side and upper stages. If the desired effect can be obtained even if only the upper part of the box-shaped roof is selected or a part of it is selected, it can be accommodated.

  As described above, according to the construction method of the underground structure of the present invention, after pressing the box-shaped roof, the concrete box is pushed forward, and the earth and sand at the face part is pushed out together with the box-shaped roof as the box is pushed. By modifying the construction method of the underground structure (SFT method) and processing without extruding the sand and sand of the face, the propulsion or towing equipment can be made smaller, and the construction can be made to have a large cross-section and extension. It can be done.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 9 are longitudinal side views of each process showing one embodiment of the construction method of the underground structure of the present invention, and FIGS. 10 to 18 are longitudinal front views of the same, and FIGS. The same components are denoted by the same reference numerals.

  In the present invention, as in the conventional SFT method, as shown in FIG. 1, a temporary earth retaining pile 1 made of earth retaining sheet piles such as a sheet pile is placed next to an upper traffic such as a railway (not shown) as shown in FIG. The start pit 2 and the arrival pit 3 are constructed, and as shown in FIG. 2, a propulsion device is installed in the start pit 2 so that the box-shaped roof 4 that is a tubular body for the roof is formed in the arrival pit 3. Press in.

  The box-shaped roof 4 is a steel cylinder having a substantially square cross section as shown in FIG. 25, and has a flange-like joint 4a formed continuously in the longitudinal direction on the side surface, and a steel plate on the upper and lower surfaces. A friction cutter plate 14 for cutting the edge with the concrete box and a friction cutter plate 14 ′ for cutting the edge with the concrete box and wrapping the earth and sand are arranged so as to sandwich the box-shaped roof 4.

  Although not shown, the box roof 4 can be sequentially connected in the length direction to embed the required length, and further parallel in the vertical and horizontal directions via the flange-shaped joint 4a as shown in FIG. Let The friction cutter plates 14 and 14 ′ are integrated by welding the ends to the end of the box-shaped roof 4, and the rest are simply placed, and the box-shaped roof 4 is sequentially connected in the length direction. In this case, the friction cutter plates 14 and 14 'themselves are connected to each other by welding or the like and are continuous.

  As shown in FIG. 22, 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 temporary earth retaining pile 1 is mirror-cut to the earth retaining steel sheet pile 10. Use as In the figure, reference numeral 7 denotes an urging member for supporting the retaining steel sheet pile 10.

  The friction cutter plate 14 is released from the end of the box-shaped roof 4 (the welding fixing is released), the outer one is fixed to the temporary earth retaining pile 1, and the inner one is a bell-raised material. Try to stop at 7.

  As shown in FIG. 3, a start base 9 is formed in the start pit 2, the concrete box 5 is installed on the start base 9 of the start pit 2, and a jack cradle 16 is provided in front of the bearing wall 15. A push jack 17 is installed and brought into contact with the rear end of the concrete box 5.

  In addition, a pushing angle with an H-shaped steel material as a box connecting work 18 is attached to the front end of the concrete box 5.

  Furthermore, as shown in FIG. 15, when there is a difference in thickness width between the box-shaped roof 4 arranged in a quadrangular shape so as to correspond to the outer shape of the concrete box 5 and the concrete box 5 (for example, a box-shaped roof □ 1000 In contrast, the thickness of the concrete box 5 is 800 mm and the difference is 200 mm). The friction cutter plate receiving material 20 made of H-type steel is placed in the concrete box 5 in the direction of the length of the concrete box 5. Arranged.

  In the reaching pit 3, a beam 19 is installed between the earth retaining steel sheet pile 10 and the temporary earth retaining pile 1.

  As shown in FIG. 4, the end of the concrete box 5 is joined or brought into contact with the rear end of the box-shaped roof 4, and the concrete box 5 is returned to the box-shaped roof 4 with a push jack 17 as shown in FIG. 5. Extrude into. In the figure, reference numeral 21 denotes a strut used for extrusion.

  The concrete box 5 can be pulled as well as being propelled. Towing, the front reaction force wall of the box is provided, a fixing device or a traction jack is attached to the rear of the box, and the other end of the traction cable with one end attached to the fixing device or the traction jack is fixed to the reaction force wall. Fix to the tow jack or fixing device and pull the tow jack. Propulsion and traction of the concrete box 5 may be performed using either one or both of the propulsion and traction.

  In this way, the concrete box 5 is to be propelled and towed, and the box roof 4 is pushed out at the same time as the concrete box 5 is pushed and pulled, and the box roof 4 is pushed out without excavating the face. At the same time, the earth and sand 22 surrounded by the box-shaped roof 4 is taken into the concrete box 5 together with the friction cutter plate 14 'for cutting the edge with the concrete box and wrapping the earth and sand.

  Further, the friction cutter plates 14 and 14 ′ stacked on the box-shaped roof 4 are stopped at the end of the wellhead when the box-shaped roof 4 is pushed out simultaneously with the propulsion and traction of the concrete box 5, and left behind. The edge cutting with the box-shaped roof 4 can be performed.

  When there is a friction cutter plate receiving material 20 inside the concrete box 5, a friction cutter plate 14 ′ for cutting the edge with the concrete box that wraps the earth and sand 22 with the friction cutter plate receiving material 20 and wrapping the earth and sand is provided. Support.

  When the box-shaped roof 4 reaches the reaching pit 3 in this way, the box-shaped roof 4 is divided at the reaching pit 3 and sequentially removed. In the figure, reference numeral 24 denotes a roof cradle provided in the reaching pit 3.

  FIG. 7 shows a state where the concrete box 5 has been press-fitted and the concrete box 5 is installed.

  If the concrete box 5 is installed as shown in FIG. 8, the earth retaining steel sheet pile 10 on the start pit 2 side is removed, the earth and sand 22 is discharged to the start pit 2 side, and removed.

  At the same time, the friction cutter plate 14 and the friction cutter plate receiving material 20 are sequentially removed.

  As shown in FIG. 9, the earth and sand 22 in the concrete box 5 are all removed to complete the construction.

It is a vertical side view of the 1st process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the 2nd process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the 3rd process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the 4th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the 5th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the 6th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the 7th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the 8th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical side view of the 9th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical front view of the 1st process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical front view (AA line of FIG. 8, BB line judgment surface) of the 2nd process which shows one Embodiment of the construction method of the underground structure of this invention. It is a longitudinal front view (AA line of FIG. 3, BB line judgment surface) of the 3rd process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical front view (AA line of FIG. 4, BB line judgment surface) of the 4th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical front view (AA line of FIG. 5, BB line judgment surface) of the 5th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical front view of the 6th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical front view of the 7th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical front view (AA line of FIG. 8, BB line judgment surface) of the 8th process which shows one Embodiment of the construction method of the underground structure of this invention. It is a vertical front view of the 9th process which shows one Embodiment 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. FIG. 21 is a cross-sectional view taken along line AA in FIG. 20. It is the BB sectional view of FIG. It is a front view of the box-type roof in a prior art example. It is a front view of the box-type roof used by this invention.

DESCRIPTION OF SYMBOLS 1 Temporary earth retaining pile 2 Starting pit 3 Arrival mine 4 Box-shaped roof 4a Joint 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 Supporting work 12a Column material 12b Beam material DESCRIPTION OF SYMBOLS 13 Mounting part 14, 14 'Friction cutter plate 15 Bearing wall 16 Jack receiving stand 17 Main pushing jack 18 Box connection work 19 Cutting beam 20 Friction cutter plate receiving material 21 Strut 22 Earth and sand 24 Roof receiving stand

Claims (2)

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 concrete box to be propelled, and press-fitted into the ground. In the construction method of the underground structure where the tip is placed and pushed together with the box roof along with propulsion and traction of the box, a friction cutter plate that cuts the edge with the concrete box so as to sandwich the box roof, and a concrete box Friction cutter plates for cutting the edges of the body and wrapping the earth and sand are placed on top of each other , and the friction cutter plate receiver is placed in parallel inside the concrete box, and the friction cutter plate that wraps the earth and sand with this friction cutter plate receiver and supporting, extruded box-shaped roof while promoting and traction of the concrete a box body, said friction cutter The plate is left when the box roof is pushed out and pulled at the same time as the concrete box is propelled and pulled, so that the box roof and the concrete box and the surrounding earth and sand are trimmed. The construction method of the underground structure is characterized in that the friction cutter plate for wrapping earth and sand is taken into the concrete box.   2. The basement according to claim 1, wherein the friction cutter plate is arranged so as to sandwich the box-shaped roof so as to be a part of a rectangular array of box-shaped roofs arranged in a rectangular array of a lower stage, a side part, and an upper stage. Construction method of structure.

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