JP5960786B2 - Shield machine collection method in open shield method - Google Patents

Description

  The present invention relates to a shield machine recovery method in an open shield method for constructing underground structures such as water and sewage systems and underground passages in an urban area.

  The open shield method is a highly rational method that takes advantage of the advantages of the open cut method (open cut method) and the shield method. Thus, it is possible to perform safe and economical construction while minimizing the influence on the surrounding environment at construction sites where construction is difficult or expensive due to conventional construction methods.

  First, this open shield construction method will be explained. As shown in FIGS. 11 to 13, reference numeral 1 in the figure is an open shield machine, which has left and right side wall plates 1a as main constituent members, and a bottom plate 1c and a beam member between them. The front, rear and upper surfaces are opened, the tip is formed as a blade edge 2, and a plurality of propulsion jacks 3 are arranged vertically in the center or near the rear end of the side wall plate 1a. A slidable movable side wall plate 1b is provided at the tip of the side wall plate 1a.

  In the figure, reference numeral 7 denotes a pressure receiving member which is appropriately suspended from the rear end of the propulsion jack 3 and is made of a frame body using box steel or mold steel. In the figure, reference numeral 8 denotes a partition wall that partitions the front excavation part and the rear part in the open shield machine 1.

  The open shield method is constructed between the start shaft 9 and the access shaft. Although illustration is omitted, the open shield machine 1 is assembled in the start shaft 9, and the ground before the start shaft 9 is excavated by a shovel excavator 6 installed on the ground. The open shield machine 1 is moved forward by extending the reaction force wall 10 in the start shaft 9 to advance, the first concrete box 4 forming the underground structure is suspended from above, and the open shield machine 1 is set behind the propulsion jack 3 shrunk in the tail portion.

  A strut is disposed between the propulsion jack 3 and the reaction wall 10 to adjust the distance appropriately.

  Further, the start shaft 9 is composed of a sheet pile sheet pile 11 such as a sheet pile, a mirror earth retaining sheet pile 11a, and a supporting work 22, and in order to start the open shield machine 1, a part of the mirror earth retaining sheet pile 11a is mirror-cut. Accordingly, the ground improvement 23 may be applied to the front part of the start shaft 9 by chemical injection or the like.

  Next, similarly, the excavator 6 excavates and removes soil from the front or top surface of the open shield machine 1 to advance the open shield machine 1, and the second concrete box 4 is placed in front of the first concrete box 4. The concrete box 4 is suspended in the tail part of the open shield machine 1.

  When the concrete box 4 is suspended in the tail portion of the open shield machine 1, a height adjusting material such as a concrete block is disposed under the concrete box 4, and the concrete box 4 is placed in the tail portion. Fill the left and right and bottom gaps with grout material.

  Thereafter, the same excavation and setting process of the concrete box 4 are repeated, and the concrete boxes 4 are sequentially embedded in the ground in columns, and the concrete boxes 4 are fastened with PC steel rods. A plastic back-filling injection material 14 is injected into the side of the steel using a grout hole formed in the concrete box 4.

  Use bulldozer or excavator etc. to put backfill 5 on the concrete box 4 at the back and squeeze it with a vibrating roller, etc., but if the open shield machine 1 reaches the reaching shaft, disassemble it.・ Remove and complete construction.

  As described above, the start shaft 9 has a retaining structure in the form of a beam support construction, and is composed of a earth retaining sheet pile 11 such as a sheet pile, a mirror earth retaining sheet pile 11a, and a support construction 22, and is used to start the open shield machine 1. It is necessary to partially mirror the mirror dowel sheet pile 11a.

  In addition, it may be necessary to apply ground improvement 13 to the front part of the start shaft 9 and the wellhead by chemical injection or the like.

The following patent document shows that when a start shaft is built and an open shield machine is started from the start shaft, the beam support work of the start shaft can be removed without any trouble, mirror cutting is unnecessary, and the ground at the start shaft of the start shaft There is no need for improvement, and it has been proposed that it is inexpensive and can shorten the construction period.
JP 2012-92601 A

  In this Patent Document 1, a propulsion jack is disposed inside the left and right side wall plates, a step of excavating and discharging the earth and sand ahead of the front or upper surface opening of the open shield machine having the front, rear and upper surfaces opened, and the propulsion jack Extending the reaction machine with the reaction wall or concrete box as a reaction force, and moving the shield machine forward, and suspending and setting a new concrete box from behind the propulsion jack shrunk in the tail part of the shield machine In the open shield construction method in which concrete boxes are embedded in series by repeating the process as appropriate, the open shield machine can be assembled by dividing the side wall plate into upper and lower stages and assembled by bolt joints. Depending on the assembly of the shield machine, the support work above the open shield machine will be removed and the side of the open shield machine inside the shaft will be backfilled or treated. Back because, after assembly completion the open shield machine, pull the mirror earth retaining sheet piles, in which to start the open shield machine.

  According to Patent Document 1, since there is no need to improve the ground of the pit of the starting shaft, it is possible to reduce the construction cost at a low cost. The installation of the open shield machine can all be installed in the vertical shaft, and if there is a covering, there is no need for temporary installation of a vertical shaft for the shield machine side plate, etc., and the construction period can be reduced. It becomes.

  Although the start shaft has been devised, there is no patent document related to this for the open shaft by the open shield method.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and to collect the open shield machine without constructing the shaft on the arrival side. As a result, even in a place where it is difficult to construct the earth retaining structure for constructing the shaft, the open shield It is providing the shield machine collection | recovery method in the open shield method which can perform construction of a construction method.

In order to achieve the above object, according to the present invention, a propulsion jack is disposed inside the right and left side wall plates, and excavated earth and sand ahead of the front or top opening of the open shield machine having the front, rear and top surfaces opened. The step of earth removal, the step of extending the jacking jack to advance the shield machine with the reaction force of the concrete box, and the new concrete box hung from the upper side behind the jacking jack shrunk in the tail of the shield machine In the open shield construction method in which the concrete box is buried in series in sequence by repeatedly repeating the installation process of lowering and joining to the existing concrete box, the front and back of the open shield machine are closed without reaching when reaching and, by placing a pulling jack to shield machine pulling stand for supporting the both sides in the main girder adjustment jack, Oh by the pulling jack Pulling the Pung shield machine above, in which it is summarized as to continue to fill the open shield machine injection hole than the gap filling material beneath the open shield machine simultaneously.

  According to the first aspect of the present invention, the open shield machine is lifted up with a jack and collected without building a shaft, but the front and rear of the open shield machine are closed, so the box is It is like pulling up, there is no dirt inside, and at the same time as pulling up, filling the gap from the injection hole in the open shield machine below the open shield machine, the lift of the open shield machine There is no gap below and the open shield machine can be lifted in a stable state without fear of tilting.

  The gist of the present invention described in claim 2 is that the ends of the concrete boxes embedded in the columns are closed by the end closing plates.

  According to the second aspect of the present invention, it is possible to prevent earth and sand and void filler from entering the concrete box by closing the end portions of the concrete boxes embedded in the columns with the end blockage plates. Can be reliably filled below the open shield machine.

  As described above, the shield machine recovery method in the open shield method of the present invention can collect the open shield machine without constructing a shaft on the arrival side, and as a result, in a place where it is difficult to construct a earth retaining structure for constructing a shaft. In addition, the open shield method can be applied.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 are longitudinal side views showing respective steps of the shield machine recovery method in the open shield method of the present invention, FIGS. 5 to 8 are longitudinal front views of the same, in which 1 is an open shield machine and 4 is a concrete box. The open shield construction method is the same as described with reference to FIGS. 11 to 13, and the front or upper surface of the open shield machine 1 in which the propulsion jack is disposed inside the left and right side wall plates and the front, rear and upper surfaces are opened. A step of excavating and discharging earth and sand ahead of the opening, a step of extending the propulsion jack and advancing the shield machine 1 with the concrete box 4 as a reaction force, and a propulsion jack contracted in the tail portion 13 of the shield machine 1 The concrete box 4 is sequentially embedded in a column by repeating the installation process of hanging a new concrete box 4 from above and joining it to the existing concrete box. It is intended.

  In the illustrated example, the open shield machine 1 according to the present embodiment is a shield machine having front, rear, and top surfaces, each of which includes left and right side wall plates 1a and a bottom plate 1c connected to the side wall plates 1a, and the body in the front-rear direction. It was divided into a plurality, and the front end of the rear body as the tail portion 13 was fitted into the rear end of the front body as the front portion 12, and a bent portion was formed by the mutual fitting portion to be bent.

  The front portion 12 is mainly used for excavation, and has a front end and an upper surface as open surfaces. Inside the machine body, the middle jacks are arranged on the left and right sides in a rearward direction, and arranged in a plurality of upper and lower stages.

  On the other hand, the tail portion 13 is used to install the concrete box 4 and has a bottom plate 5, and a propulsion jack (shield jack) is directed to the front and rear in the body, and a plurality of upper and lower portions are also provided. Arranged in steps.

  As shown in FIG. 1, when the necessary length concrete boxes 4 are embedded in a column, the open shield machine 1 is further advanced to separate from the concrete box 4. In FIG. 1, A indicates a shield machine front end position when excavation is completed, B indicates a shield machine rear end position when excavation is completed, C indicates a seal machine front end position after separation of the shield machine, and D indicates a seal machine rear end position after separation of the shield machine. Reference numeral 14 denotes a back-filling injection material.

  In the present invention, the open shield machine 1 and the concrete box 4 are separated from each other as described above, and the front and rear of the open shield machine 1 are closed by the shield machine end face closing plate 15 made of a steel plate. The shield machine end face closing plate 15 closed before the open shield machine 1 is a face retaining ring.

  Also, remove the propulsion jacks, etc. used for excavation and remove them.

  In this state, the end of the concrete box 4 embedded in the column is closed with an end closing plate 16 made of concrete, wood, or the like.

  Next, as shown in FIG. As shown in FIG. 10, the shield lifting base (main girder) 17 has a main girder adjustment jack 20 erected on a reaction force plate 18 laid on the ground with a fall prevention member 19 interposed therebetween. Support both sides with the girder adjustment jack 20. In the figure, reference numeral 21 denotes a fixing member for the main girder adjusting jack 20 to the shield machine lifting stand (main girder) 17.

  Then, a center hall type shield machine pull-up jack 24 is placed on the shield machine pull-up base (main girder) 17 and a pull-up cable 25 (or a steel bar) is set.

  As shown in FIG. 3, an open shield machine injection hole 26 is formed in the bottom of the open shield machine 1, and a filler grout hose 27 is installed there.

  The pulling cable 25 is coupled to the open shield machine 1 and the open shield machine 1 is pulled up by the shield machine pulling jack 24. The shield machine lifting jack 24 pulls up the pulling cable 25 in accordance with the movement of the scale insect (repeats fixing and non-fixing of the fixing member), whereby the open shield machine 1 is pulled up.

  The gap generated by pulling up the open shield machine 1 is injected and filled with the gap filler 28 from the inside of the open shield machine 1 through the filler grout hose 27 and the injection hole 26 in the open shield machine.

  The operation of pulling up the open shield machine 1 and filling the gap filler 28 is repeated, and the pulling operation is performed to a predetermined height. In the figure, α is the lifting height of the shield machine.

  Since the open shield machine 1 is supported by the gap filling material 28, even if the machine body is divided into a plurality of parts in the front-rear direction and includes the front part 12 and the tail part 13, it can be safely lifted.

  As shown in FIG. 4, after the lifting of the open shield machine 1 is completed, the lifting platform and jack are removed. The removal of the lifting frame and jack is removal of the shield machine lifting frame (main girder) 17, the main girder adjustment jack 20, the shield machine lifting jack 24, and the like.

  Moreover, the open shield machine 1 pulled up to the ground can be appropriately disassembled or recovered as it is.

It is a vertical side view which shows the 1st process of the shield machine collection | recovery method in the open shield method of this invention. It is a vertical side view which shows the 2nd process of the shield machine collection | recovery method in the open shield construction method of this invention. It is a vertical side view which shows the 3rd process of the shield machine collection | recovery method in the open shield method of this invention. It is a vertical side view which shows the 4th process of the shield machine collection | recovery method in the open shield method of this invention. It is a vertical front view which shows the 1st process of the shield machine collection | recovery method in the open shield method of this invention. It is a vertical front view which shows the 2nd process of the shield machine collection | recovery method in the open shield method of this invention. It is a vertical front view which shows the 3rd process of the shield machine collection | recovery method in the open shield method of this invention. It is a vertical front view which shows the 4th process of the shield machine collection | recovery method in the open shield method of this invention. It is a top view which shows the 1st process of the shield machine collection | recovery method in the open shield method of this invention. It is a front view of the principal part of shield machine raising stand installation. It is a vertical side view which shows the excavation process of an open shield method. It is a vertical side view which shows the concrete installation process of an open shield method. It is a perspective view which shows the outline | summary of an open shield construction method.

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a ... Side wall plate 1b ... Movable side wall plate 1c ... Bottom plate 2 ... Cutting edge 3 ... Propulsion jack 4 ... Concrete box 5 ... Backfill soil 6 ... Excavator 7 ... Pressure receiving member 8 ... Bulkhead 9 ... Starting shaft DESCRIPTION OF SYMBOLS 10 ... Reaction wall 11 ... Earth retaining sheet pile 11a ... Mirror earth retaining sheet pile 12 ... Front part 13 ... Tail part 14 ... Back injection material 15 ... Shield machine end face closing plate 16 ... End part closing plate 17 ... Shield machine lifting stand (main girder) )
DESCRIPTION OF SYMBOLS 18 ... Reaction force plate 19 ... Fall prevention member 20 ... Jack for main girder adjustment 21 ... Fixing member 22 ... Supporting work 23 ... Ground improvement 24 ... Jack for raising shield machine 25 ... Lifting cable 26 ... Injection hole 27 in open shield machine ... Filler grout hose 28 ... gap filler

Claims (2)

Protrusion jacks are arranged inside the left and right side wall plates, and the process of excavating and discharging the earth and sand in front of the front or top opening of the open shield machine with the front, rear and top surfaces open, and the propulsion jacks to extend the concrete box The process of advancing the shield machine with the reaction force and the installation process of hanging a new concrete box from the top behind the propulsion jack shrunk in the tail part of the shield machine and joining it to the existing concrete box as appropriate In the open shield construction method in which concrete boxes are repeatedly embedded in series one after another, when reaching, the front shaft is closed, the front and rear of the open shield machine are closed, and both sides are supported by main girder adjustment jacks by placing a pulling jack to the frame, pulling open shield machine upwards by the pulling jack, at the same time open Shield machine collection method in an open shield method, characterized in that from the shield machine injection hole gradually the void filling material is filled in under the open shield machine. The shield machine recovery method in the open shield method according to claim 1, wherein the ends of the concrete boxes embedded in the columns are closed with an end closing plate.

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