JP2016176257A - Construction method of underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of an underground structure capable of reducing steel material weight and processing cost for assembling a strut, and capable of simplifying even labor of construction since the number of part items can be reduced.SOLUTION: In a construction method of an underground structure for pushing out sediment of a working face part together with a box-shaped roof, by propelling a concrete box body by arranging a tip part of the concrete box body in a box-shaped roof end part, after being pressed-in the ground from a starting pit 3, by assembling-arranging the box-shaped roof 6 being a box-shaped cylindrical body of a rectangular cross section so as to correspond to an external shape of the concrete box body 9 trying to propel, a strut 16 installed in the starting pit is formed by using the box-shaped roof.SELECTED DRAWING: Figure 1

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 is first formed as a separate work and an underground structure is constructed by excavating the pipe roof, or if the underground structure is allowed to dig under the pipe roof, this pipe roof exists. The soil cover becomes thicker by that amount. 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, in Patent Document 1 below, a box-shaped roof, which is a tubular body for roof, is press-fitted toward an access pit, an underground structure is set by a concrete box, and the forward movement of the box-shaped roof and concrete While alternately repeating the forward movement of the box, the box-shaped roof that has come out to the reaching pit is removed in sequence, and when the tip of the concrete box reaches the reaching pit, the blades installed at the front end of the concrete box are removed. Then, perform backfill grout as appropriate to complete the construction.
JP-A-55-19312

The R & C (Roof & Culvert) method of Non-Patent Document 1 below is an advanced form of the above-mentioned Patent Document 1, and is a non-cutting underpass that replaces and installs a box roof and a box culvert, which are track and road protection works. It is a construction method.
Internet website Homepage of Uemura Giken Kogyo Co., Ltd. http://www.uemuragiken.co.jp/ R & C Method

  As shown in FIG. 5, a steel roof having a rectangular cross section (standard cross section 800 × 800) is used as a track or road protection work in the upper part of the construction section (non-opened portion), and the box roof 6 is installed. It arranges so that it may correspond to the outer edge of a concrete box (box culvert) 9, and penetrates the full length of a cross section beforehand.

  The earth retaining steel sheet pile 2 is placed beside the upper traffic such as a railroad, the start pit 3 and the arrival pit 4 are constructed, and a propulsion device (not shown) is installed in the start pit 3 for the roof. A box-shaped roof 6 that is a cylindrical body is press-fitted toward the reaching pit 4. A friction cutter plate 7 is attached to the upper surface of the box roof 6 and pushed out together with the box roof 6.

  The box-shaped roof 6 is a box-shaped cylinder having a rectangular cross section as shown in FIG. 7, and has a flange-shaped joint 6a, 6b formed continuously in the longitudinal direction on the side surface, and a friction cutter made of a flat plate on the upper surface. A plate 7 is attached. The box-shaped roof 6 can be sequentially connected in the length direction to embed the required length, and is further juxtaposed in parallel in the vertical and horizontal directions via the hook-shaped joints 6a and 6b.

  A concrete box (box culvert) 9 with a blade edge 17 (steel face excavation work space) installed at its rear end is installed, and it is pushed as a propulsion equipment between the bearing wall 8 behind the concrete box 9 The jack 10 and the spacer 23 are disposed.

In the figure, reference numeral 18 denotes a jack storage pipe containing a roof propulsion jack 19, which is installed between the concrete box 9 and the box-shaped roof 6, and between the bearing wall 8 behind the concrete box 9. A push jack 10 and a strut 16 are disposed as propulsion equipment.

  Next, the concrete box 9 is installed in the start pit 3, and the push jack 10 and the spacer 23 are disposed as propulsion equipment between the bearing wall 8 behind the concrete box 9.

  Then, the friction cutter plate 7 is fixed to the start shaft 3 side by the stop member 14. The friction cutter plate 7 cuts the box roof 6 and the concrete box 9 and the surrounding earth and sand.

  While excavating the face in the tunnel (inside the blade edge 17), the box-shaped roof 6 and the concrete box 9 are pushed in by pushing out the box-shaped roof 6 with the roof propulsion jack 19 and extending the main jack 10 into the concrete box 9. 9 is installed. Remove the box-shaped roof 6 at the arrival mine 4

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

  Further, the concrete box 9 is further propelled until the tip of the concrete box 9 reaches the reaching pit 4, and the propulsion of the full length of the concrete box 9 is completed.

  As the concrete box 9 advances, the strut 16 is assembled as shown in FIG. This strut 16 is a frame 22 assembled with H-shaped steel 22a. One example is shown in FIG. 6, in which the bearing wall 8 made of concrete is installed at the innermost part of the start shaft 3, and before that, the H A cross girder frame 21 framed with steel molds is formed, and a strut 16 is assembled on the front side thereof.

  The strut 16 is formed by connecting a plurality of (six in the drawing) box-shaped frames formed by combining H-shaped steel 22a vertically and horizontally and vertically.

  A spacer 23 is disposed in front of the strut 16, and the former jack 10 is positioned in front of the spacer 23.

  As described above, the strut 16 is a gantry framed with the H-shaped steel 22a, has many members, is troublesome to assemble, and has a high steel weight and wet construction cost.

  The purpose of the present invention is to eliminate the disadvantages of the conventional example, and to reduce the weight and processing cost of the steel material for assembling the struts, and also to reduce the number of parts, so that the construction of the underground structure can be simplified. To provide a law.

  In order to achieve the above-mentioned object, the present invention firstly arranges a box-shaped roof, which is a box-shaped cylindrical body having a rectangular cross section, so as to correspond to the outer shape of the 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 the earth and sand of the face is pushed together with the box-type roof while pushing the box, The struts to be installed in the box are formed using a box-type roof. Second, the box-type roof used for strut formation is diverted by pressing the box-type roof after being pressed into the ground. Third, the strut is The gist of the invention is to stack the box-shaped roofs in the longitudinal direction of the starting vertical shaft and stack them in a plurality of stages, and stack them in the vertical direction with a frame interposed between them.

  According to the first aspect of the present invention, the strut is formed by using a box-shaped roof that is a box-shaped cylindrical body having a rectangular cross section, which is a member larger than the H-shaped steel, and the number of members can be reduced. . Moreover, since a box-type roof is used, it is not necessary to prepare a special member for forming a strut, and the steel material weight and processing cost can be reduced.

  According to the second aspect of the present invention, the box roof used for forming the struts can be sequentially enlarged in a timely manner by diverting the box roof that has been pressed into the ground and then pushed out. In addition, by diverting materials, it is possible to streamline construction such as reducing material transportation costs, reducing material costs, and eliminating the need for stock yards.

  According to the third aspect of the present invention, when the box-type roof is formed as the strut, the box-type roof is used vertically, so that the strut having the required length and the required height can be reliably formed with the few box-type roofs it can.

  As described above, the construction method of the underground structure according to the present invention can reduce the weight of the steel material and the processing cost for assembling the struts, and can also reduce the number of members, thereby simplifying the construction work. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing an embodiment of a construction method for an underground structure according to the present invention, and shows a start pit 3.

  The premise of the present invention is the R & C method described with reference to FIG. 5, and a steel roof having a rectangular cross section (standard cross section 800 ×) as a protective work for the track and road above the construction section (non-cut portion). 800), the box roof 6 is arranged so as to match the outer edge of the concrete box ((box culvert)) 9 to be installed, and penetrates the entire length of the cross section in advance.

A concrete box 9 having a blade edge 17 (steel face excavation work space) installed at its rear end is installed, and the box-shaped roof 6 is pushed out while the face is excavated in the tunnel, and the concrete box 9 is pushed into the box. The roof 6 and the concrete box 9 are replaced and installed.

As described above, the members of the box-shaped roof 6 shown in Table 1 below are used as a protective work for the construction section.

  The box-shaped roof 6 is a box-shaped cylinder having a rectangular cross section as shown in FIG. 11, and has a flange-shaped joint 6a, 6b formed continuously in the longitudinal direction on the side surface, and a friction cutter made of a flat plate on the upper surface. A plate 7 is attached.

  The box roof 6 pushed out to the arrival pit 4 is collected and earth and sand are discharged, but the struts 16 installed in the start pit 3 are formed by diverting the collected box roof 6. The friction cutter plate 7 is left in the ground when the box-shaped roof 6 is pushed out and is not on the box-shaped roof 6.

  A bearing wall 8 made of concrete is installed in the innermost part of the start pit 3, a well frame 21 made of H-shaped steel is formed in front of it, and a strut 16 is assembled on the front side.

  The strut 16 has a box-shaped roof 6 that is pressed into the ground and pushed out into the ground as described above to 3 m or 6 m, and as shown in FIG. They are stacked and arranged in stages, and in the vertical direction, they are stacked with a frame 24 interposed between them.

  In this embodiment, as shown in FIG. 2, the struts 16 are arranged in a horizontal U shape with the box-shaped roofs 6 open at the top, and the box-shaped roofs 6 are arranged at intervals on the bottom, and on the left and right sides. It was piled on the lower two tiers, the gantry 24 was placed thereon, and one tier was further piled thereon.

  Box-shaped roof 6 has hook-shaped joints 6a and 6b projecting on the side surface, but this is not disturbed.

The struts 16 become longer in accordance with the propulsion of the concrete box 9, and in the example of FIG. 1, the 6m length is three and the 3m length is one length, and extends from stage (a) to (d). Each time, the box-shaped roof 6 pushed out to the arrival pit 4 is collected, diverted, and assembled.

  Further, the box-type roof 6 is provided with triangular connection flanges at the corners of the box-type roof 6 in the length direction, and the box-type roofs 6 are fastened with bolts.

  When the strut 16 is constituted by the box-type roof 6, the spacer 23 is disposed in front of the strut 16, and the main pushing jack 10 is positioned in front of the spacer 23.

  FIG. 4 shows a strut frame 22.

It is a side view of the principal part which shows one Embodiment of the construction method of the underground structure of this invention. It is a front view of the strut and spacer of the construction method of the underground structure of this invention. It is explanatory drawing of the principal part of the strut of the construction method of the underground structure of this invention. It is a front view of a strut (frame body). It is a vertical side view which shows the R & C method. It is a side view which shows a prior art example. It is a front view of a box side roof.

DESCRIPTION OF SYMBOLS 1 Upper traffic 2 Earth retaining sheet pile 3 Starting pit 4 Arrival pit 5 Propulsion machine 6 Box-type roof 6a, 6b Fence-like joint 7 Friction cutter plate 8 Bearing wall 9 Concrete box 10 Main pushing jack 14 Stopping member 15 Base 16 Strut 17 Cutting edge 18 Jack storage tube 19 Roof propelling jack 21 Cross girder frame 22 Frame 22a H-shaped steel 23 Spacer 24 Mounting base

Claims (3)

  A box-shaped roof, which is a box-shaped cylinder with a rectangular cross section, is assembled and arranged so as to correspond to the outer shape of the box to be propelled, and after being press-fitted into the ground from the starting shaft, the box roof is end-mounted. In the construction method of an underground structure where the tip of the body is placed and the earth and sand of the face part is pushed out together with the box roof along with the promotion of the box, the struts to be installed in the start shaft are formed using the box roof Construction method of underground structures characterized by   The construction method of an underground structure according to claim 1, wherein the box roof used for strut formation is diverted after being pressed into the ground and then pushed out. The underground structure according to claim 1 or 2, wherein the struts are box-shaped roofs oriented in the longitudinal direction of the starting shaft and stacked in a plurality of stages, and stacked in a vertical direction with a frame interposed therebetween. Construction method.

Images