JP6510432B2 - Construction method of underground structure - Google Patents

Description

  The present invention relates to a construction method of an underground structure which can be constructed without obstructing the upper traffic when a large member of the underground structure is constructed in a cross direction in a lower ground such as a railway or a road. is there.

  In order to cross the direction of a large member underground structure in the lower ground such as railways, roads etc., a protective construction for supporting upper traffic is required, and a pipe roof where steel pipes etc. are horizontally arranged in parallel etc. Can be mentioned.

  However, if a pipe roof was first formed as a separate work, and the underground structure was constructed by excavating under and inside the pipe roof, or this underground structure would be excavated under the pipe roof, this pipe roof is The amount of overburden increases as much as it exists. Moreover, the protection work of the pipe roof construction is a separate work from the main construction of underground structure burial, and the construction cost and construction period are large.

In order to eliminate this disadvantage, the inventors of the present invention, as described in the following patent document, press-in the box-shaped roof and then promote the concrete box, the soil in the face portion of the cutting face is Since it is extruded together, it is possible to reduce costs and shorten the construction period without separately needing a drilling operation for the face portion, and also to improve the safety by omitting the drilling operation for the face portion with danger, By distributing reaction force resistance for propelling a box, we applied for the construction method of the underground structure which does not need a large-scale equipment, and obtained the patent right.
Patent No. 4134089 gazette

This method is named as the SFT method as an abbreviation of “a simple and faceless tunnel construction method” as the “Simple and Face-Less Method of Construction of Tunnel”, and is also described in Non-Patent Document 1 below.
The website of Uemura Giken Kogyo Co., Ltd. on the Internet website http://www.uemuragiken.co.jp/tech/sft.html

  In the SFT method, as shown in FIG. 13 as the first step, the retaining steel sheet pile 2 is placed beside the upper traffic (not shown) such as a railway to build the starting pit 3 and the reaching pit 4 The propulsion unit 5 is installed in the start pit 3, and the box-shaped roof 6, which is a roof cylinder, is then pressed into the reaching pit 4. A friction cutter plate 7 is attached to the upper surface of the box-shaped roof 6 in the same manner as in the prior art, and is extruded together with the box-shaped roof 6.

  The box-like roof 6 is arranged in a rectangular shape so as to correspond to the outer shape of the concrete box 9 to be promoted, and the earth retaining member 19 is disposed at the face surrounded by the box-like roof 6.

  In the figure, 17 is a raised material, which is fixed by a tie-lot material 18 which connects the retained steel sheet pile 2 on the start pit 3 side and the retained steel sheet pile 2 on the arrival pit 4 side. 20 shows a starting platform.

  Further, a reaction force body 21 is provided on the side of the reaching pit 4 and the front of the reaction force body 21 is further excavated to build a shaft, and a reaction force wall 23 is provided as a reaction force pile 22 in the shaft.

  Next, as shown in FIG. 14 of the second step, the concrete box 9 is installed on the starting stand of the start pit 3, the traction jack 24 is attached to the rear of the concrete box 9, and one end is attached to this traction jack 24 The other end of the cable 25 is fixed to the fixing device 26 fixed to the reaction wall 23.

  Then, the friction cutter plate 7 is fixed to the start pit 3 side by the stop member 14. The friction cutter plate 7 cuts off the box roof 6 and the concrete box 9 from the surrounding soil.

  Next, the front end of the concrete box 9 is joined or abutted to the rear end of the box-type roof 6 that has been extruded first, and as a third step, the traction jack 24 is operated as shown in FIG. At 25, the concrete box 9 is pulled from the starting pit 3 toward the reaching pit 4.

  When the box-like roof 6 is pushed out simultaneously with the pulling of the concrete box 9, the excavation of the face is not carried out, and when the box-like roof 6 is pushed out, it is disposed in the part surrounded by the box-like roof 6 simultaneously By extruding the earth retaining members 19 connected and fixed to each other at 18, the soil in front of it is also extruded simultaneously. In this case, since the rim of the box-shaped roof 6 and the concrete box 9 and the surrounding earth and sand is made by the friction cutter plate 7 as described above, the box-shaped roof 6 and the concrete box 9 can be pulled smoothly.

  Thus, as shown in FIG. 16 as the fourth step, if the earth and sand extruded simultaneously surrounded by the box-shaped roof 6 and the box-shaped roof 6 reach the reaching pit 4, the box-shaped roof is reached by the reaching pit 4. Remove the soil and excavate the soil at the same time as removing 6.

  Then, the tip of the concrete box 9 is further pulled until reaching the reaching pit 4 to complete the promotion of the full length of the concrete box 9.

  Although the above explained the case of pulling of the concrete box 9, the reaction wall and the underground structure by the concrete box 9 are set in the start pit 3 and the original between the reaction wall and the concrete box 9 is set. A push jack may be provided, and the main push jack may be extended to dig concrete box 9.

  The SFT method of Patent Document 1 uses a box-shaped roof. The installation method of the friction cutter plate (FC plate) is fixed to the end of the box-like roof and construction is performed.

  The promotion construction cost of the box-shaped roof may be higher by the same amount or more than the box construction promotion construction cost. In addition, box-like roof promotion is a manual work and the construction period is also long.

  The object of the present invention is to construct an underground structure which can carry out the SFT construction method which is a construction method of a simple and faceless tunnel without using a box-shaped roof and pursue the economical efficiency and the shortening of the construction period. To provide.

In order to achieve the above object, the present invention according to claim 1 is characterized in that the friction cutter plate is doubled so as to correspond to the outer shape of the box to be propelled, and the lower, side and upper After arranging in a quadrilateral rectangular array, fix the outer friction cutter plate, and let the end of the inner friction cutter plate overlap with the pressing angle placed in front of the box, and the inner friction cutter plate with the pressing angle The gist is that it is pushed out with the earth and sand inside the friction cutter plate at the front of the box with the promotion.

  According to the invention of claim 1, the friction cutter plate on the inner side is pushed out together with the earth and sand inside the friction cutter plate at the front of the box with the promotion of the box, and the SFT method is used without using the box roof. It can be implemented.

Moreover, it is easy to push out with the earth and sand inside a friction cutter plate at the front part of a box by a pushing angle, and this pushing angle also plays a role which bundles and pushes out an inside friction cutter plate.

In the present invention according to claim 2, the friction cutter plate is disposed so as to extend between the start pit and the reach pit which are constructed by placing a temporary earth pile made of earth retention steel sheet piles, and the earth in the sand in the friction cutter plate is retained. The gist is to arrange the internal steel sheet pile with the steel sheet pile mirror-opened back and forth as earth retaining material.

  According to the present invention as set forth in claim 2, by arranging the steel sheet piles back and forth as the earth retaining material, this earth retaining material serves as a lid in the case of being surrounded by the friction cutter plate, and the friction cutter plate is earth retaining The material is supported by a material, and even with a non-strong friction cutter plate, it is possible to push out the earth and sand inside.

  As mentioned above, the construction method of the underground structure of the present invention can carry out the SFT construction method which is a construction method of a simple and faceless tunnel without using a box roof, and pursues economic efficiency and shortening of construction period. It is possible to

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional side view of the main part of the construction method of the underground structure of the present invention before promotion of the box, and FIG. 2 is a longitudinal side view of the main part after promotion of the same box. Moreover, FIGS. 3-8 is a vertical side view of each process.

  3 to 8 are vertical side views of each process, and as shown in FIG. 3, a temporary earth retaining pile consisting of earth retaining steel sheet piles 2 is placed by the side of upper traffic (not shown) such as railways. The start pit 3 and the arrival pit 4 are built, and the friction cutter plate 7 is disposed in a double manner so as to cross between the start pit 3 and the arrival pit 4.

  The doubled friction cutter plate 7 is buried in the ground by press-fitting or pulling, and in the case of pulling, as shown in FIG. 12, the ground is cut by the ground cutting machine 28 by the ground cutting wire 27, The pulling device 29 pulls in from the reaching pit 4 side. The friction cutter plate 7 is sequentially connected by welding on the start pit 3 side.

  The double-sided friction cutter plate 7 is assembled in a rectangular array of lower, side and upper portions to correspond to the outer shape of the concrete box 9 to be promoted as shown in FIGS. At that time, the earth retaining steel sheet pile 2 is mirror-opened, and the inner steel sheet pile surrounded by the friction cutter plate 7 is used as the earth retaining member 40.

  As shown in FIGS. 4 and 9, the friction cutter plate 7 located on the outer side passes a girder 30 made of H-shaped iron at its end as a fixing device 32, and is welded and fixed by a rib 31.

  The starting base 33 and the reaching base 34 are respectively formed of concrete floorboards in the starting pit 3 and the reaching pit 4, and a reaction wall 35 is provided in the starting pit 3.

  The lower portion of the friction cutter plate 7 positioned on the outer side may be fixed to the launch pad 33 by an anchor 36.

  As shown in FIG. 5, a concrete box 9 and a pushing angle 37 made of steel material are placed in the start pit 3 in advance.

  The end of the friction cutter plate 7 inside the doubled friction cutter plate 7 is superposed on this pushing angle 37. The pushing angle 37 is such that the rear steel material is higher than the front steel material to form a step, and the end portion of the friction cutter plate 7 can be locked by this step.

  As shown in FIG. 6, the main push jack 38 and the strut 39 are set between the reaction wall 35 and the concrete box 9, and the concrete box 9 is pushed out by the main push jack 38, but at the same time the push angle 37 and the friction cutter plate 7 and the soil 41 inside it are also pushed out.

  Of the double-sided friction cutter plate 7, the outer friction cutter plate 7 acts as a friction reducing edge member against the inner friction cutter plate 7, and the inner friction cutter plate 7 is the earth retaining material of the sand 41 inside. Act as. Moreover, the front and back of the earth and sand 41 are held down by the earth retaining material 40.

  Thus, as shown in FIG. 7, the friction cutter plate 7, the soil 41, and the pushing angle 37 which have come out of the reaching pit 4 are properly removed, and the tip of the concrete box 9 reaches the reaching pit 4 as shown in FIG. 8. If done, complete the construction.

It is a longitudinal side view of the principal part before promotion of the box of the construction method of the underground structure of the present invention. It is a longitudinal cross-sectional view of the principal part after promotion of the box of the construction method of the underground structure of this invention. It is a vertical side view which shows the 1st process of the construction method of the underground structure of this invention. It is a vertical side view which shows the 2nd process of the construction method of the underground structure of this invention. It is a vertical side view which shows the 3rd process of the construction method of the underground structure of this invention. It is a vertical side view which shows the 4th process of the construction method of the underground structure of this invention. It is a vertical side view which shows the 5th process of the construction method of the underground structure of this invention. It is a vertical side view which shows the 6th process of the construction method of the underground structure of this invention. It is a perspective view of a fixing device. It is a front view which shows arrangement | positioning of the friction cutter plate of the construction method of the underground structure of this invention. It is a front view which shows arrangement | positioning of the friction cutter plate of the construction method of the underground structure of this invention, and a box. It is an explanatory view showing pulling of a friction cutter plate. It is a vertical side view which shows the 1st process of a prior art example. It is a vertical side view which shows the 2nd process of a prior art example. It is a vertical side view which shows the 3rd process of a prior art example. It is a vertical side view which shows the 4th process of a prior art example.

DESCRIPTION OF SYMBOLS 2 earth retaining steel sheet pile 3 start pit 4 arrival pit 5 propulsion machine 6 box-shaped roof 6a, 6b ridge-like joint 7 friction cutter plate 8 reaction wall 9 concrete box 10 main press jack 11 cutting edge 12 small jack 13 support 14 Retaining members 15 pedestals 16 struts 17 uplifting members 18 tie lot members 19 ground retention members 20 starting blocks 21 reaction force bodies 22 reaction force piles 23 reaction wall 24 traction jacks 25 traction cables 26 fixing devices 27 ground cutting wire 28 ground cutting machine 29 Traction device 30 girders 31 Ribs 32 Fixing devices 33 Launching platform 34 Reaching platform 35 Reaction wall 36 Anchor 37 Pushing angle 38 Original push jack 39 Strut 40 Earth retaining material 41 Earth and sand

Claims (2)

Double the friction cutter plate so that it corresponds to the external shape of the box you are going to propel and place it in a rectangular array of lower, side and upper parts in the ground by press-in or pull, then place the outer friction cutter plate The end of the inner friction cutter plate is fixed to the pressing angle placed in front of the box, and the inner friction cutter plate is pressed with the pressing angle and the soil in the friction cutter plate inside with the fore part of the box. Underground construction method characterized by extruding. Friction knife plate is positioned to span between arrival anti the starting pit constructed by pouring a temporary earth retaining pile consisting of earth retaining sheet pile, the interior of the steel sheet piles in friction cutter plate inside the sediment was Kagamibiraki the earth retaining sheet piles The construction method of the underground structure of Claim 1 which arrange | positions back and forth as earth retaining material.

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