JP2016118018A - Shield machine removal method in open shield method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method that eliminates the need for a process of face cutting of the arrival vertical shaft upon arrival of an open shield machine in an arrival vertical shaft, and eliminates the need for counter-excavation to the shield machine or removal of the upper part of the shield machine before entering a mine, and thereby reduces the processes, in an open shield method for sequentially burying a concrete caisson in columns.SOLUTION: In an open shield method, an arrival vertical shaft 17 is formed in a plane U-shape placing a steel sheet pile, and by opening the arrival direction of a shield machine 1, ground improvement 18 is provided inside this open port, the end of the shield machine 1 and a concrete caisson 4 is made to enter the inside of the arrival vertical shaft 17 by penetrating through the ground improvement 18, a pithead retaining wall is provided in the end of the portion of the ground improvement 18, the excavation in the arrival vertical shaft 17 is sequentially performed for an upper stage, a middle stage and a lower stage in a stepwise manner; and the shield machine 1 is removed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a shield machine removal 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. 15 to 17, reference numeral 1 in the figure is an open shield machine, which is composed of the left and right side wall plates 1a as main constituent members and connected between them by a bottom plate and a beam member. A front surface, a rear surface, and an upper surface are opened, a tip is formed as a blade edge 2, and a plurality of propulsion jacks 3 are arranged side by side 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 earth retaining sheet pile 11 such as a sheet pile, a mirror earth retaining sheet pile 11a, and a supporting work 12, 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 13 may be applied to the front portion 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 successively embedded in the ground in columns, and the concrete boxes 4 are fastened together with the PC steel rods 15. The plastic back-filling injection material 44 is injected into the side of 4 using the 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 supporting work 12, and is used to start the open shield machine 1 It is necessary to partially mirror the mirror dowel sheet pile 11a.

  Moreover, it may be necessary to give the ground improvement 13 to the front part of the start shaft 9 and a wellhead by chemical | medical solution injection | pouring.

  Although not shown in the figure for the reach shaft, it is composed of earth retaining sheet piles such as sheet piles, mirror earth retaining sheet piles, and support works similar to the start shaft 9, and this mirror earth retaining sheet pile is used to reach the open shield machine 1 into the arrival shaft. Mirror the part.

  Moreover, when there is an upset in the reach shaft, when the shield machine enters the mine, the upper stage part of the open shield machine 1 is removed in advance.

  Further, the reaching shaft also cuts a part of the mirror earth retaining sheet pile. From the reaching shaft side, the open shield machine 1 is dug and the lining plate is placed on the top so that the earth and sand do not enter. Apply.

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 purpose of the present invention is not only to devise the starting shaft of the conventional example, but also to the reaching shaft on the reaching side, there is no need for the mirror cutting method of the reaching shaft when reaching the open shield machine, and the shield shaft is dug. Therefore, it is not necessary to remove the upper part of the shield machine before entering the mine, and the object is to provide a shield machine removal method in the open shield method that can reduce the number of processes.

  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 sequentially embedded in series by repeating the installation process of descending and joining to the existing concrete box, the vertical shaft is a U-shaped plane with steel sheet piles placed, and the shield machine arrival direction is The ground is improved inside the opening, and the shield machine and the end of the concrete box are inserted into the vertical shaft through the ground improvement. Toe input sequentially by installing wellhead soil retaining the edge of the ground improvement unit, in which the upper, middle, and subject matter to remove the lower stepwise shafts in drilling and shield machine to.

  According to the first aspect of the present invention, since the reaching shaft is a U-shaped plane and the shield machine arrival direction is opened, the arrival direction of the open shield machine is opened and it is not necessary to perform mirror cutting. As a result, there is no need to dig from the reach shaft to the open shield machine, and the shield machine can be entered. Since the ground is improved inside the opening at the time of entering this mine, it is possible to enter without damaging the ground.

  In addition, when entering the open shield machine, the reaching shaft is at the stage where steel sheet piles have been placed, and there is earth and sand outside the open shield machine. There is no need to remove the upper part of the shield machine before entering the mine because there is no raising.

  After entering the open shield machine, install an earth retaining at the end of the ground improvement section and perform excavation in the shaft in stages, upper, middle and lower, and install support works each time. The open shield machine can be dismantled and removed step by step.

  As described above, the shield machine removal method in the open shield method of the present invention does not require mirror cutting of the reach shaft when the open shield machine arrives on the reach shaft side. Since it is not necessary to remove the upper part of the shield machine before entering the mine, there is no need for a lining plate to turn the shield machine when reaching the open shield machine, which can reduce the process, and there is no need for a mirror cutting work type. Furthermore, since there is no need to remove the upper part of the shield machine before entering the mine, the process can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1-7 is a top view which shows each process of the shield machine removal method in the open shield method of this invention, FIGS. 10-14 is AA sectional view taken on the line of FIG.

  In the figure, 1 is an open shield machine, 4 is a concrete box, and the open shield method is as described above with reference to FIGS. 15 to 17, and propulsion jacks are arranged inside the left and right side wall plates, and the front, rear and Excavating and discharging the earth and sand in front of the open shield machine 1 with the upper surface open or the upper surface opening; extending the propulsion jack to advance the shield machine 1 with the concrete box 4 as a reaction force; The concrete box 4 is successively embedded in a column by repeating the installation process of hanging a new concrete box 4 from above and joining to the existing concrete box behind the propulsion jack shrunk in the tail portion of the machine 1 as appropriate. Is.

  In the illustrated example, the open shield machine 1 of the present embodiment divides the machine body into a plurality of parts in the front-rear direction, and the front end of the rear machine body as the tail part 33 is inserted into the rear end of the front machine body as the front part 32. The middle bent portion 34 is formed by the mutual fitting portion so that it can be bent.

  The front portion 32 is mainly used for excavation, and has a front end and an upper surface as open surfaces, and the middle folding jacks 15 are arranged rearward and rearward in the airframe, and are arranged in a plurality of upper and lower stages.

  On the other hand, the tail portion 33 is used to install the concrete box 4 and has a bottom plate 5, and a propulsion jack (shield jack) 14 is directed leftward and rightward toward the front and rear in the machine body, and also up and down. It is arranged in multiple stages. In the figure, 16 is a blade jack for taking in and out the movable side wall plate 1b.

  In FIG. 1, reference numeral 17 in the figure denotes a reaching shaft formed by placing a steel sheet pile, but the reaching shaft 17 is formed as a planar U-shape having a shield machine arrival direction opened.

  The ground improvement 18 is applied to the inside of the opening of the reaching shaft 17 by a chemical injection method or the like.

  As shown in FIG. 2, the end of the shield machine 1 and the concrete box 4 penetrates the ground shaft 17 through the ground improvement 18, and as shown in FIG. A clasp 19 is installed. As shown in FIG. 10, the well opening 19 may be a portion corresponding to the upper part of the shield machine 1.

  The entrance of the shield machine 1 and the end of the concrete box 4 into the reaching shaft 17 is an extension of the shield method, and excavating and discharging the soil in front of the front or top opening of the open shield machine 1 and propulsion. The process of extending the jack and moving the shield machine 1 forward with the concrete box 4 as a reaction force, and hanging the new concrete box 4 from the upper side behind the propulsion jack shrunk in the tail part 1b of the shield machine 1 Then, the concrete box 4 is sequentially embedded in a column by repeating the installation process of joining to the existing concrete box 4 as appropriate.

  In the figure, reference numeral 20 denotes a back-filling material applied to the outside of the concrete box 4.

  The upper stage in the reaching shaft 17 is excavated, and the upper stage member of the shield machine 1 that has been excavated and has no soil outside is removed. (See Figure 10)

  Next, as shown in FIG. 4, a support 21 is installed inside the upper stage of the reaching shaft 17 that has been excavated, the middle stage in the reaching shaft 17 is excavated as shown in FIG. 5, and the middle part of the shield machine 1 is removed. The earth retaining 19 is applied to the middle stage. The excavation of the middle stage in the reach shaft 17, the removal of the middle part of the shield machine 1, and the installation of the earth retaining 19 can be performed in a plurality of stages (processes).

  As shown in FIGS. 6 and 13, the lower stage in the reaching shaft 17 is excavated, the earth retaining 19 is applied to the lower stage, and the lower member of the shield machine 1 is removed as shown in FIGS. 7 and 14. Thereby, all the shield machines 1 are removed.

It is a top view which shows the 1st process of the shield machine removal method in the open shield construction method of this invention. It is a top view which shows the 2nd process of the shield machine removal method in the open shield construction method of this invention. It is a top view which shows the 3rd process of the shield machine removal method in the open shield construction method of this invention. It is a top view which shows the 4th process of the shield machine removal method in the open shield construction method of this invention. It is a top view which shows the 5th process of the shield machine removal method in the open shield construction method of this invention. It is a top view which shows the 6th process of the shield machine removal method in the open shield construction method of this invention. It is a top view which shows the 7th process of the shield machine removal method in the open shield construction method of this invention. It is a vertical side view which shows the 2nd process of the shield machine removal method in the open shield construction method of this invention. It is a BB line half sectional view of Drawing 8. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is the sectional view on the AA line of FIG. It is the sectional view on the AA line of FIG. It is the sectional view on the AA line of FIG. It is the sectional view on the AA line of FIG. 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 board 1b ... Movable side wall board 2 ... Cutting edge 3 ... Propulsion jack 4 ... Concrete box 5 ... Backfill 6 ... Excavator 7 ... Pressure-receiving member 8 ... Bulkhead 9 ... Starting shaft 10 ... Anti Force wall 11 ... Dota sheet pile 11a ... Mirror dowel sheet pile 12 ... Supporting work 13 ... Ground improvement 14 ... Propulsion jack (shield jack)
DESCRIPTION OF SYMBOLS 15 ... Half-fold jack 16 ... Cutting edge jack 17 ... Reaching shaft 18 ... Ground improvement 19 ... Mouth earth retaining material 20 ... Backfilling material 21 ... Supporting work 32 ... Front part 33 ... Tail part 34 ... Folding part 44 ... Plastic shape Backfilling material

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 sequentially embedded in series by repeating the installation process of descending and joining to the existing concrete box, the vertical shaft is a U-shaped plane with steel sheet piles placed, and the shield machine arrival direction is The ground is improved inside the opening, and the shield machine and the end of the concrete box are inserted into the vertical shaft through the ground improvement. ON Toe, the wellhead soil retaining placed in a portion corresponding to the upper portion of the shield machine end portions of ground improvement, drilled upper in arrival pit, the upper shield machine has disappeared soil outside the excavation to The members were removed, a support was built inside the upper stage of the excavated reaching shaft, the middle stage in the reaching shaft was excavated, the middle part of the shield machine was removed, the earth retaining to the middle stage was provided, and the reaching shaft was The gist is to excavate the lower stage in the interior, apply earth retaining to the lower stage, and remove the lower stage member of the shield machine .

Claims (1)

  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 buried in series repeatedly, the vertical shaft is a U-shaped planer with steel sheet piles placed in it, and the shield machine arrival direction is opened, and ground improvement is applied to the inside of this open mouth, Pierce the ground improvement, let the shield machine and the end of the concrete box enter the reaching shaft, and install the earth retaining at the end of the ground improvement part Next, the upper, middle, shield machine removing method in an open shield method was characterized by removing the lower stepwise shafts in drilling and shield machine.

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