JP6568894B2 - Open shield machine - Google Patents

Description

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

  The open shield method is a rational method that utilizes the advantages of the open cut method (open cut method) and the shield method, and the outline of the open shield machine 1 used in this open shield method is as shown in FIG. The front, rear, and top surfaces of the plate 1a and the bottom plate 1b connected to the side wall plates 1a are opened, the front ends of the side wall plate 1a and the bottom plate 1b are formed as blade edges 11, and the center of the side wall plate 1a is formed. Alternatively, the shield jacks 2 are arranged side by side in the vertical direction near the rear end. In the figure, 3 indicates a partition wall.

  The open shield method to be constructed using the open shield machine 1 is not shown in the figure, but the open shield machine 1 is installed in the start pit, the shield jack 2 of the open shield machine 1 is extended, and the inside of the start mine is The open shield machine 1 is advanced by taking the reaction force against the reaction wall, the first concrete box 4 forming the underground structure is suspended from above, and the shield is shrunk in the tail part 1c of the open shield machine 1 Set behind jack 2. A strut is disposed between the shield jack 2 and the reaction wall to adjust the distance appropriately.

  In addition, the start pit is made up of a retaining wall, and in order to start the open shield machine 1, a part of this retaining wall is mirror-cut. If necessary, the ground is improved at the front part of the starting pit by chemical injection or the like. Sometimes it is left.

  Excavator 9 such as an excavator excavates and removes soil from the front or top surface of open shield machine 1. Simultaneously with or after this earth removal step, the shield jack 2 is extended to advance the open shield machine 1. In the case of this forward process, a pushing angle 8 made of a frame made of box steel or mold steel is arranged in front of the concrete box 4, and the open shield machine 1 receives a reaction force from the concrete box 4 set rearward. Take.

  Then, the second concrete box 4 is suspended in the tail part 1 c of the open shield machine 1 in front of the first concrete box 4. Thereafter, the same soil removal process, advance process, and setting process of the concrete box 4 are repeated as appropriate, and the concrete boxes 4 are sequentially left in the ground in line with the advancement of the open shield machine 1, and further this concrete box. Put backfill 5 on the upper surface of 4.

  When the concrete box 4 is suspended in the tail part 1c of the open shield machine 1, a height adjusting material 7 such as a concrete block is disposed under the concrete box 4, and the concrete part 4 is placed in the tail part 1c. The grout material 6 is filled in the left and right and lower spaces of the box 4.

  In this way, if the open shield machine 1 reaches the reaching mine, it is removed and the construction is completed.

  In such an open shield construction method, as described above, the concrete box 4 is left in the ground in a column as the open shield machine 1 advances, and the concrete box 4 is suspended in the tail portion 1c of the open shield machine 1. As the open shield machine 1 moves forward, it leaves the tail portion 1c and remains in the ground. The open shield machine 1 takes a reaction force on the concrete box 4 left in the ground in this way. Advance.

  The concrete box 4 is made of reinforced concrete and comprises a left side plate 4a, a right side plate 4b, an upper floor plate 4c, and a lower floor plate 4d as shown in FIG.

By the way, as shown in the following patent documents, as shown in FIGS. 7 and 8, the blade edge 11 at the tip is divided into a plurality of upper and lower horizontal directions, and a slide earth retaining plate 12 protruding forward by a slide jack 13 is provided. There is one that slides the slide retaining plate 12 forward and protrudes from the left and right side wall plates 1a to prevent the collapse of the front side natural ground.
Japanese Patent No. 3923973

  As shown in FIGS. 3 and 4, the slide earth retaining plate 12 is a sliding door type, and the front end portion of the side wall plate 1 a of the open shield machine 1 is used as a door pocket 14 so that the slide retaining plate 12 can be inserted into and removed from it.

  A slide jack 13 for sliding the slide retaining plate 12 is disposed so as to straddle the inside of the slide retaining plate 12 and the interior of the door pocket 14.

  The fixed portion 15 on the slide retaining plate 12 side of the slide jack 13 is pivotally attached to the inside of the slide retaining plate 12 near the front edge 11, and the fixed portion 16 on the open shield machine 1 side is pivoted on the back of the door pocket 14. Worn. The fixed portion 15 is provided at the end of the rod of the slide jack 13, and the fixed portion 16 is provided at the end of the cylinder.

  In the conventional structure shown in FIGS. 3 and 4, the slide retaining plate 12 may not return (shrink) due to distortion or intrusion of earth and sand.

  The slide retaining plate 12 is such that the retaining plate extends forward by the pushing force of the slide jack 13 and contracts into the shield machine 1 by the pulling force of the slide jack 13. Due to the structure of the hydraulic jack that is the slide jack 13, The pulling force is about 30 to 50% smaller than the pressing force, and it is because a force sufficient to contract the retaining plate is not exhibited.

  Further, in order to extend and retract the slide retaining plate 12, it is necessary to fix one end of the slide jack 13 to the main body side of the open shield machine 1 and the other end to the slide jack 13 side as a jack box. The fixed portion of the slide jack 13 to the slide retaining plate 12 is near the front end near the face, and it is difficult to control the movement of the rear end portion during the contraction operation.

  The object of the present invention is to eliminate the inconveniences of the prior art, and to excavate and remove the soil in front of the front or top opening of the open shield machine, and to extend the propulsion jack to shield the concrete box as a reaction force An open shield that embeds concrete boxes in series one after another by repeatedly repeating the process of advancing the machine and the process of hanging and setting a new concrete box behind the propulsion jack shrunk in the tail part of the shield machine. An open shield that is used in the construction method and has a possibility that the slide retaining plate will not return in an open shield machine that is divided into a plurality of blade edges in the horizontal direction by a sliding door type sliding retaining plate that drives the left and right side wall plates with a slide jack. Is to provide a machine.

In order to achieve the above object, the invention according to claim 1 includes a step of excavating and discharging soil in front of the front or upper surface opening of the open shield machine, and a reaction force to the concrete box by extending the propulsion jack. The process of advancing the shield machine and the process of hanging and setting a new concrete box from the top behind the propulsion jack shrunk in the tail part of the shield machine are repeated as appropriate to embed the concrete boxes in series. to be used in the open shield method, in the right and left side walls open shield machine by sliding earth retaining plate of the sliding door type was divided into several horizontally divided cutting edge driven by a slide jack and to slide the jack slide earth retaining plate slide jack so to be arranged Te, provided outside of the door pocket, and the shield machine main body side solid Provide the part closer to the cutting edge, the engaging part on the slide retaining plate side facing the back of the shield machine, deploy the slide retaining plate with the pulling force of the slide jack, and store the sliding retaining plate with the pushing force This is what I have done.

  According to the present invention of claim 1, the slide retaining plate is extended by the pulling force of the slide jack, and the retaining plate is contracted by the pushing force, the fixing unit on the shield machine main body side of the slide jack is provided closer to the cutting blade, By providing the fixed part on the slide retaining plate side closer to the rear end, it is possible to guide the rear end of the retaining plate in the direction of return and to contract with a greater force than before, and the retaining plate is returned. The fear of not being lost.

In addition, the slide jack is placed side by side with the slide retaining plate to provide the fixed portion of the slide jack on the shield device body side closer to the cutting edge, so that the tip of the slide retaining plate when stored and the shield device body side Can be brought close to each other and the slide jack can be extended to push out the slide retaining plate without difficulty.

  As described above, the open shield machine of the present invention is a shield machine that excavates and removes the soil in front of the front or upper surface opening of the open shield machine, and extends the propulsion jack to react the concrete box. Open shield method in which the concrete box is sequentially embedded in series by repeatedly repeating the process of moving forward and the process of hanging and setting a new concrete box from the top behind the propulsion jack shrunk in the tail part of the shield machine. In an open shield machine that is divided into a plurality of horizontal blades by a sliding door-type slide retaining plate that is driven by a slide jack on the left and right side wall plates, there is no possibility that the slide retaining plate will not return. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional plan view when a slide retaining plate, which is the main part of the open shield machine of the present invention, is unfolded. FIG. 2 is a cross-sectional plan view when stored, which is the same as FIGS. Components are given the same reference numerals.

  Since the basic structure of the open shield machine 1 of the present invention is the same as that of the conventional example shown in FIG. 5, the same reference numerals are assigned and detailed description thereof is omitted.

  As shown in FIG. 8, the open shield machine 1 of the present invention is a type in which a blade edge 11 is divided into a plurality of divided blade edges in the vertical direction, and each divided blade edge protrudes forward independently. A slide earth retaining plate 12 protruding forward with a slide jack 13 is provided at the tip of the mouth.

  The slide earth retaining plate 12 is the same as the conventional one in that it is a sliding door type and the front end portion of the side wall plate 1a of the open shield machine 1 is used as a door pouch 14 so as to be freely put in and out.

  In the present invention, the slide jack 13 is provided outside the door pocket 14 so as to be juxtaposed with the slide earth retaining plate 12.

  Further, the slide jack 13 is provided with a fixing portion 16 on the main body side of the open shield machine 1 closer to the cutting edge (closer to the tip edge 11), and an engagement portion 17 on the slide earth retaining plate 12 side is directed rearward of the open shield machine 1. Provided.

  The fixed portion 16 is provided at the end of the cylinder of the slide jack 13, and the engaging portion 17 is provided at the end of the rod of the slide jack 13.

  In the figure, 18 is an engagement plate that connects both the slide retaining plate 12 and the slide jack 13, and this moves through a slit (not shown).

  Regarding the relationship between the slide retaining plate 12 and the slide jack 13, the slide retaining plate 12 is developed by the pulling force of the slide jack 13, and the slide retaining plate 12 is stored by the pushing force.

  That is, as shown in FIG. 2, when the slide retaining plate 12 is completely stored, the slide jack 13 is extended, and the rod is engaged with the slide retaining plate 12 with the rod protruding from the cylinder, and the slide jack 13 is contracted. Accordingly, the slide retaining plate 12 goes forward.

  In this way, the slide earth retaining plate 12 is slid forward and protrudes from the left and right side wall plates 1a to prevent the collapse of the front side natural ground.

It is a cross-sectional top view at the time of the expansion | deployment of the part of the slide earth retaining plate which is the principal part of the open shield machine of this invention. It is a cross-sectional top view at the time of accommodation of the part of the slide earth retaining plate which is the principal part of the open shield machine of this invention. It is a cross-sectional top view at the time of the expansion | deployment of the part of the slide earth retaining plate which is the principal part of the open shield machine which shows a prior art example. It is a cross-sectional top view at the time of accommodation of the part of the slide earth retaining plate which is the principal part of the open shield machine which shows a prior art example. It is a vertical side view which shows the outline of an open shield construction method. It is a perspective view of a concrete box. It is a perspective view of the conventional open shield machine. It is a vertical side view which shows the outline | summary of an open shield machine.

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a ... Side wall board 1b ... Bottom board 1c ... Tail part 2 ... Shield jack 3 ... Bulkhead 4 ... Concrete box 4a ... Left side board 4b ... Right side board 4c ... Upper floor board 4c ... Lower floor board 5 ... Backfill 6 ... Grout material 7 ... Height adjusting material 8 ... Push angle 9 ... Excavator 10 ... Opening 11 ... Cutting edge 12 ... Slide retaining plate 13 ... Slide jack 14 ... Door pocket 15 ... Fixed part 16 ... Fixed part 17 ... Engagement part 18 ... Engagement plate

Claims (1)

The process of excavating and discharging soil in front of the front or top opening of the open shield machine, the process of extending the propulsion jack and advancing the shield machine with the concrete box as a reaction force, and shrinking in the tail part of the shield machine It is used in the open shield construction method in which a concrete box is buried in a row in sequence by suspending and setting a new concrete box at the rear of the propulsion jack as needed, and the left and right side wall plates are driven by a slide jack. In an open shield machine that is divided into multiple blades in the horizontal direction by a sliding door-type sliding retaining plate,
The slide jack is provided on the outside of the door pocket so as to be juxtaposed with the slide retaining plate, and the fixing part on the shield machine main body side is provided near the cutting blade, and the engaging part on the slide earth retaining plate side is provided behind the shield machine. An open shield machine, which is provided with a sliding retaining plate deployed with a pulling force of a slide jack and a sliding retaining plate stored with a pushing force.