JP2009114640A - Open shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a grout material from flowing in forward, when the grout material is injected by a tail section. <P>SOLUTION: This open shield machine 1 is used for an open shield method in which concrete box bodies 4 are sequentially buried in column by appropriately repeating a step of excavating and removing sediment ahead of the front or top opening of the open shield machine 1, a step of advancing the shield machine 1 by using a concrete box body 4 as a reaction force, and a step of setting the new concrete box body 4 by lowering it in a suspended state from above in the rear of a shield jack 2 contracted in the tail section 1c of the shield machine 1. A side plate 12 of the tail section 1c is mounted in outward openable/closable manner in a lateral portion of a section, where the concrete box body 4 is lowered in the suspended state, of the tail section 1c. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an open shield machine that is used in an open shield method for constructing underground structures such as water and sewage systems, common grooves, telegraphs and telephones, and other underground passages in urban areas.

  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 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 upper 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 this advancement process, a press bar 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 reacts from the concrete box 4 set on the rear side. Take.

  Then, the second concrete box 4 is suspended in the tail portion 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 opened in the tail part 1c. The grout material 6 is primarily injected into the gap between the inside of the shield machine 1 and the bottom plate 1b below the bottom of the concrete box 4, and the open shield machine 1 is further advanced, and the gap formed here after the bottom plate 1b advances. Then, the grout material 6 is further injected into the left and right sides of the concrete box 4 to complete the filling of the grout material.

  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.

  The prior art is generally performed by those skilled in the art, and is not related to a known invention.

   The shield jack 2 is a propulsion jack that propels the main body of the open shield machine 1, but when the construction part is curved, as shown in FIG. 1, the front part 1d and the tail are arranged so that the shield machine propels along the curve. The middle fold jack 14 is disposed here with the portion 1c as a middle fold portion, and the traveling direction of the front portion 1d and the tail portion 1c is changed along the curve by the left and right stroke difference of the middle fold jack 14. The shield machine moves forward.

  For this reason, a large opening is formed on the outer side of the curve at the bent portion between the front portion 1d and the tail portion 1c.

  As a result, when the grout material 6 is injected at the tail portion 1c, the grout material 6 may flow forward toward the opening.

  An object of the present invention is to provide an open shield machine that eliminates the inconvenience of the conventional example and prevents the grout material from flowing forward when the grout material is injected at the tail portion.

  In order to achieve the above object, the invention according to claim 1 includes a step of excavating and discharging soil in front of an open shield machine or a front opening of the open shield machine, and a shield machine using a concrete box as a reaction force. An open shield construction method in which the concrete box is sequentially embedded in series by repeatedly repeating the process of advancing and the process of hanging and setting a new concrete box from the upper side behind the shield jack shrunk in the tail part of the shield machine. The gist of the open shield machine to be used is that the tail side plate is attached to the side of the concrete box hanging portion of the tail portion so as to be openable and closable outward.

  According to the first aspect of the present invention, the grout material is injected by first injecting the grout material into the gap between the inside of the open shield machine and the bottom plate below the bottom of the concrete box in the tail portion. After the bottom plate moves forward, further grout material is injected into the gap and the left and right sides of the concrete box. In the secondary injection, the tail plate is closed to close the grout forward. Inflow of material can be prevented.

  Such inflow prevention can be flexibly adapted to curve construction since the opening / closing degree of the tail side plate can be adjusted corresponding to the curve when the construction portion is curved.

  As described above, the open shield machine according to the present invention is provided with the tail part side plate at the tail part. Therefore, it is possible to prevent the grout material from flowing into the front of the shield machine by closing it when the grout material is injected. Such an effect is particularly noticeable when a half-moon-shaped closing plate is provided at the bent portion of the shield machine to close the opening generated outside the curve when the curve is constructed, and the adverse effect on the closing plate can be prevented. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional plan view before excavation of a curved portion construction site showing an embodiment of the open shield machine of the present invention, and FIG. 2 is a cross-sectional plan view after excavation.

  The basic structure of the open shield machine of the present invention is the same as that of the conventional example shown in FIG. 3, and the shield jack 2 is disposed at the left and right positions of the front part of the tail part 1c. The forward direction of the front portion 1d and the tail portion 1c when the open shield machine 1 is advanced by the shield jack 2 by disposing the middle folded jack 14 at the position and changing the stroke difference between the left and right middle folded jacks 14. Is made different to correspond to the curve of the curve construction part.

  In the open shield machine 1 having such a configuration, the rear end portion of the front portion 1d and the front end portion of the tail portion 1c are the bent portions. As shown in FIG. 1, a gap is generated between the middle bent portion and the outer digging line outside the tail portion 1 c outside the curve in the curved construction portion.

  In the present invention, in order to close this gap, a half-moon-shaped closing plate 15 that can be opened and closed outward is provided outside the tail portion 1c.

  Therefore, in the curved construction portion, when a gap is generated outside the tail portion 1d outside the curve, the closing plate 15 disposed outside the curve is rotated outward and is crimped to the excavation wall. As a result, the gap can be closed by the closing plate 15 and the earth and sand can be prevented from entering into the open shield machine 1 from the gap, and the excavation wall can be compacted by the closing plate 15 being in close contact with the excavation wall and collapsed. The open shield machine 1 can be smoothly pushed along the curve.

  In such an open shield machine 1, the front end of the tail portion side plate 12 is pivotally attached to the tail portion 1c so that the rear end of the tail portion side plate 12 can be opened and closed outside the side portion of the tail portion 1c. The injection pipe 13 was disposed behind the tail side plate 12.

  Therefore, the grout material 6 is injected from the inside of the shield machine into the gap between the inside of the open shield machine 1 and the bottom plate 1b below the bottom of the concrete box 4 in the tail part 1c, The open shield machine 1 is advanced, and after the bottom plate 1b has advanced, the grout material 6 is further injected from the injection pipe 13 into the gap formed here and to the left and right of the concrete box 4, but at the time of secondary injection By closing the tail part side plate 12, the inflow of the grout material 6 to the front can be prevented.

  Such inflow prevention can flexibly cope with the curve construction because the opening / closing degree of the tail part side plate 12 can be adjusted corresponding to the curve when the construction part is a curve.

  When the half-moon-shaped closing plate 15 is disposed in front of the tail side plate 12, the inflow of the grout material 6 toward the closing plate 12 can be prevented. Prevents adverse effects caused by.

It is a cross-sectional top view before excavation which shows embodiment of the open shield machine of this invention. It is the cross-sectional top view after excavation which shows embodiment of the open shield machine of this invention. 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.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Open shield machine 1a Side wall board 1b Bottom board 1c Tail part 1d Front part 2 Shield jack 3 Bulkhead 4 Concrete box 4a Left side board 4b Right side board 4c Upper floor board 4d Lower floor board 5 Backfill soil 6 Grout material 7 Height adjustment material 8 Press Bar 9 Excavator 10 Opening 11 Cutting edge 12 Tail side plate 13 Injection pipe 14 Folding jack 15 Blocking plate

Claims (1)

  The process of excavating and discharging the soil in front of the front or top opening of the open shield machine, the process of advancing the shield machine with the reaction force of the concrete box, and behind the shield jack shrunk in the tail part of the shield machine In the open shield machine used in the open shield construction method, in which the concrete box is sequentially embedded in series by suspending and setting a new concrete box from above, the concrete box hanging part of the tail part An open shield machine with a tail side plate attached to the side so that it can be opened and closed.

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