JP5989718B2 - Concrete box used for open shield method - Google Patents

Description

  The present invention relates to a concrete box used in an open shield method for constructing underground structures such as water and sewage systems and underground passages in urban areas.

  The open shield method is a rational method that makes use of the advantages of the open cut method (open cut method) and the shield method, and is promoted using an upper open type shield machine (open shield machine) while preventing sediment collapse. This is a method of laying a box inside.

  8 and 9, the open shield machine 1 in the figure is a shield machine having left, right and left side walls and bottom plates connected to the side walls, with front, rear and top surfaces opened. .

  The open shield machine 1 is divided into a plurality of bodies in the front-rear direction, and the front end of the rear body as the tail portion 1b is fitted into the rear end of the front body as the front portion 1a. The middle bent portion 2 is formed to be bendable.

  The front part 1a 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 and rearward and rearward in a plurality of stages.

  On the other hand, the tail portion 1b is used to install the concrete box 4 and has a bottom plate 5, and the propulsion jack (shield jack) 3 is directed to the front and rear in the body, and is moved up and down. It is arranged in multiple stages.

  In the figure, 6 is a slide retaining plate provided at the front end of the front machine 1a, and 8 is a press bar (push angle).

  Next, an open shield construction method using such an open shield machine 1 will be described. Although illustration is omitted, the open shield machine 1 is installed in the start shaft and the propulsion jack 3 of the open shield machine 1 is extended. Then, the open shield machine 1 is moved forward by taking the reaction force against the reaction wall in the starting pit, and the first concrete box 4 forming the underground structure is suspended from above by a lifting machine 14 such as a crane, It is set behind the propulsion jack 3 contracted in the tail 1b portion of the open shield machine 1.

  The excavator 7 such as an excavator excavates and removes soil from the front or upper surface of the open shield machine 1. At the same time as or after this earth removal step, the propulsion jack 3 is extended to advance the open shield machine 1.

  Then, the second concrete box 4 is suspended in the tail portion 1 b 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 as the open shield machine 1 moves forward. 4. Backfill the upper surface of 4.

  When the concrete box 4 is suspended in the tail part 1b 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 part 4 is placed inside the tail part 1b. Filling the backside injection material 9 using the instantaneous setting grout material in the left and right and lower gaps of the box 4 to perform the primary injection, and after the open shield machine 1 moves forward, as a secondary injection, the concrete box Back injection material 9 is injected from the inside of 4 to the outside by a grout hole.

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

  The concrete box 4 is made of reinforced concrete or PC concrete, and includes a left side plate 4a, a right side plate 4b, an upper floor plate 4c, and a lower floor plate 4d, and the front and rear surfaces are opened as openings.

  By the way, the concrete boxes 4 buried in a column in the ground are fixed bolts when a new concrete box 4 is suspended in the tail portion 1b of the open shield machine 1 with respect to the existing concrete box 4. The fixing portion 10 is formed by fastening, but in order to have earthquake resistance as a completed underground structure, a cushioning material 11 such as rubber is interposed between the concrete boxes 4 as shown in FIG. It is made into a joint.

  In the figure, reference numeral 12 denotes an insert (bolt insertion hole) for inserting the fixing bolt, and 13 denotes a sealing material such as rubber packing.

On the other hand, the new concrete box 4 is suspended in the tail portion 1b of the open shield machine 1 and joined to the existing concrete box 4 as a positioning for joining the concrete box 4 as described in the following patent document. A guide pin insertion hole 15 having a circular cross section is formed in the surface, and a round bar-shaped guide pin is inserted into the guide pin insertion hole 15 to connect the concrete boxes 4 at the front and rear positions to each other.
JP 2002-38881 A

  Since the guide pin inserted into the guide pin insertion hole 15 is inserted in a fixed state without play, it will resist the vertical and horizontal movements of the concrete box 4 during an earthquake. It becomes a hindrance to making a joint.

  The object of the present invention is to eliminate the inconveniences of the prior art, and to use a flexible joint between the concrete boxes, and to set the concrete box before and after the concrete box to be suspended from the existing concrete box. Even when the box is coupled with a guide pin, the guide pin can follow the movement of the concrete box allowed by the flexible joint, so the presence of the guide pin becomes an obstacle to the flexible joint. It is to provide a concrete box used for the open shield construction method.

In order to achieve the above object, according to the present invention, firstly, a propulsion jack is disposed inside the left and right side wall plates, and excavation and excavation of earth and sand in front of the front or upper surface opening of the open shield machine having front, rear and upper surfaces opened. Extending the propulsion jack and advancing the shield machine with the reaction force of the concrete box composed of the left and right side plates, the upper floor plate and the lower floor plate, and behind the propulsion jack contracted in the tail portion of the shield machine A concrete box used in an open shield method in which a concrete box is sequentially embedded in series by hanging a new concrete box from above and joining it to an existing concrete box. A guide pin insertion hole is provided in the joint surface of the body, and a concrete box is installed here by inserting the guide pin and suspending it from the existing concrete box. Straddles when the positioning is provided a cushioning material for compression deformation at the center of the guide pin in wrapping, the buffer material in the opening of the concrete a box body of the guide pin insertion holes of the position before and after being inserted with the guide pins that, The gist is that the guide pin can follow the front / rear or up / down / left / right movement of the concrete box by contacting the guide pin insertion hole .

Secondly, a step of arranging a jacking jack inside the left and right side wall plates, excavating and discharging the soil in front of the front or top opening of the open shield machine with the front, rear and top surfaces opened, and extending the jacking jack The process of advancing the shield machine with the reaction of the concrete box consisting of the left and right side panels, the upper floor board and the lower floor board, and a new concrete box hung from above at the back of the propulsion jack shrunk in the tail part of the shield machine It is a concrete box used in the open shield method of burying concrete boxes in tandem by repeating the installation process of dropping and joining to the existing concrete box, and guide pin insertion holes on the joint surface of the concrete box When positioning the concrete box to be hung on the existing concrete box by inserting the guide pin here, Provided cushioning material to compressive deformation is divided into pins to the left and right guide pins to wrapping, the guide pin insertion the cushioning material to be inserted respectively the guide pin into the hole via a cushioning material by abutting the guide pin concrete box-body The gist of the present invention is that the guide pins can follow the movement of the concrete box forward and backward or up and down and left and right by bridging between the guide pin insertion holes .

  According to the first aspect of the present invention, the guide pin can be inserted into the positioning for hanging and connecting the new concrete box to the existing concrete box at the tail part of the open shield machine. Because the buffer pin abuts against the guide pin insertion hole, the guide pin can follow the vertical and horizontal movement of the concrete box. Even if the concrete box is displaced up and down or left and right due to an earthquake, etc. Does not interfere with the flexible joint.

  In addition, the cushioning material is provided in the center of the guide pin and is wound around the guide pin insertion hole between the concrete boxes, so that the cushioning material (rubber) at the center of the guide pin is deformed and the box at the time of earthquake Can be followed.

According to the second aspect of the present invention, as in the first aspect, the cushioning material is divided into the left and right sides of the guide pin, and is provided on the body winding, and is inserted into the guide pin insertion hole of each concrete box. Thus, the buffer material is positioned at both ends of the guide pin, and the behavior of the box during an earthquake can be followed by deformation of the buffer material (rubber) at both ends of the guide pin.

  As described above, the concrete box used in the open shield method of the present invention is a case where a flexible joint is used between the concrete boxes and the positioning of the concrete box suspended from the existing concrete box is set. Therefore, even when the front and rear concrete boxes are connected by a guide pin, the guide pin can follow the movement of the concrete box allowed by the flexible joint, so the presence of the guide pin prevents the flexible joint from being used. It does not become a factor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal side view of a main part showing a first embodiment of a concrete box used in the open shield method of the present invention, and shows a guide pin in use.

  In the figure, 4 is a concrete box used in the open shield method, and the open shield method and this concrete box 4 are as described above. In the open shield method, propulsion jacks are arranged inside the left and right side wall plates. A concrete box comprising a left and right side plate, an upper floor plate, and a lower floor plate by excavating and discharging the earth and sand in front of the front or upper surface opening of the open shield machine having the front, rear and upper surfaces opened 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 Repeatedly, the concrete boxes are sequentially embedded in columns.

  The concrete box 4 is made of reinforced concrete or PC 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. ing.

  Further, the concrete box 4 is a flexible joint to provide earthquake resistance as an underground structure, and a cushioning material 11 such as rubber is interposed between the concrete boxes 4 and a sealing material 13 by rubber packing or the like. Is arranged.

  In the present invention, a new concrete box 4 is suspended in the tail portion of the open shield machine and is connected to the existing concrete box 4 so that the guide pin insertion hole 15 having a circular cross section is formed on the joint surface of the concrete box 4. And guide pins 17 are inserted into the guide pin insertion holes 15.

  The guide pin insertion hole 15 is formed by a metal cylindrical guide pin socket 16 as a sheath, and opens to the end face of the concrete box 4.

In the present invention, a buffer material 18 made of hard rubber is provided on the guide pin 17, and the buffer material 18 abuts on the guide pin insertion hole 15 when the guide pin 17 is inserted, so that the concrete box 4 can be moved back and forth or vertically and horizontally. The guide pin can follow the movement.

  In the first embodiment, the guide pin 17 has a round bar-shaped metal main body 19 with a shock absorber 18 made of hard rubber at the center of the guide pin.

  The shape of the metal main body portion 19 of the guide pin 17 may be the same as the conventional one, but the example shown in the figure is a straight shape with the left and right ends being pointed portions 19a.

  The cushioning material 18 is a horizontal cylindrical shape, and the metal main body portion 19 penetrates in the length direction. The outer diameter of the cushioning material 18 substantially matches the inner method of the guide pin insertion hole 15. Further, the length was selected so as to straddle the opening of the guide pin insertion hole 15 of the concrete box 4 at the front and rear positions.

In this way, when the guide pin 17 is inserted into the guide pin insertion hole 15, the cushioning material 18 is inserted into the guide pin insertion hole 15, and the guide pin 17 is connected to the concrete box 4 via the cushioning material 18. It spans between the insertion holes 15.

  Next, the displacement of the concrete box 4 at the time of an earthquake will be described. As shown in FIG. In some cases, opening and compression of the joints may occur, or in a disconnected state, opening may occur.

  FIG. 2 shows a state in which the concrete box 4 is open, while the concrete box 4 behaves so as to open the joints, while the cushioning material 18 continues to straddle between the guide pin insertion holes 15 of the concrete box 4, and the guide Since the contact with the pin insertion hole 15 continues, the guide pin 17 does not fall off, and does not hit the guide pin insertion hole 15 and obstruct the flexible joint.

  FIG. 3 shows a bent state. In this case as well, the concrete box 4 behaves so that the joints open, but the cushioning material 18 is compressed and deformed, and the guide pin 17 is displaced up and down or left and right of the concrete box 4. Follow.

FIG. 4 shows a second embodiment of the present invention. The cushioning material 18 is divided into left and right guide pins 17 and is provided on the body winding. These cushioning materials 18 are placed in the guide pin insertion holes 15 of each concrete box 4. Each guide pin 17 is inserted when inserted.

  The cushioning material 18 is a short horizontal cylindrical shape made of hard rubber, and the metal main body portion 19 penetrates in the length direction. The outer diameter of the cushioning material 18 substantially matches the inner method of the guide pin insertion hole 15.

  In this way, when the guide pin 17 is inserted into the guide pin insertion hole 15, the cushioning material 18 is inserted into the guide pin insertion hole 15, and the guide pin 17 is connected to the concrete box 4 via the cushioning material 18. It spans between the insertion holes 15.

  FIG. 5 shows a case of a disconnected state, and FIG. 6 shows a case of a bent state. In each case, the buffer material 18 is compressed and deformed, and the guide pin 17 follows the movement of the concrete box 4.

It is a vertical side view of the principal part which shows the time of guide pin use in 1st Embodiment of the concrete box used for the open shield method of this invention. It is a vertical side view of the principal part which shows the slipping-out state at the time of earthquake in 1st Embodiment of the concrete box used for the open shield method of this invention. It is a vertical side view of the principal part which shows the bending state at the time of an earthquake in 1st Embodiment of the concrete box used for the open shield method of this invention. It is a vertical side view of the principal part which shows the time of guide pin use in 2nd Embodiment of the concrete box used for the open shield method of this invention. It is a vertical side view of the principal part which shows the omission state at the time of an earthquake in 2nd Embodiment of the concrete box used for the open shield method of this invention. It is a vertical side view of the principal part which shows the bending state at the time of an earthquake in 2nd Embodiment of the concrete box used for the open shield method of this invention. It is explanatory drawing which shows the displacement of the concrete box at the time of an earthquake. It is explanatory drawing at the time of box installation of an open shield construction method. It is explanatory drawing at the time of the box connection of an open shield construction method. It is a side view of the completed underground structure by the open shield method. It is a perspective view which shows the joint surface of a concrete box.

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a ... Front part 1b ... Tail part 2 ... Folding part 3 ... Propulsion jack (shield jack)
4 ... Concrete box 4a ... Left side plate 4b ... Right side plate 4c ... Upper floor plate 4d ... Lower floor plate 5 ... Bottom plate 6 ... Slide retaining plate 7 ... Excavator 8 ... Press bar (push angle)
9 ... Back injection material 10 ... Fixing part 11 ... Cushion material 12 ... Insert (bolt insertion hole)
DESCRIPTION OF SYMBOLS 13 ... Sealing material 14 ... Lifting machine 15 ... Guide pin insertion hole 16 ... Guide pin socket 17 ... Guide pin 18 ... Buffer material 19 ... Metal main part 19a ... Sharp part

Claims (2)

Protrusion jacks are disposed inside the left and right side wall plates, and 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, The process of advancing the shield machine with the reaction of the concrete box composed of the upper floor board and the lower floor board, and a new concrete box hung from the upper side behind the propulsion jack shrunk in the tail part of the shield machine. A concrete box used for an open shield method in which concrete boxes are sequentially embedded in columns by repeating the installation process of joining to the concrete box as appropriate,
When positioning the concrete box to be installed on the joint surface of the concrete box with a guide pin insertion hole, where the guide pin is inserted and suspended on the existing concrete box,
A cushioning material that compresses and deforms in the center of the guide pin is provided on the body winding
Straddles the guide pin insertion hole the buffer material in the opening of the guide pin insertion hole of the concrete box-body position before and after being inserted with the guide pins in the front and rear or the top and bottom of the concrete box-body by abutting the guide pin insertion holes A concrete box used in the open shield method, characterized in that the guide pin can follow the movement to the left and right. Protrusion jacks are disposed inside the left and right side wall plates, and 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, The process of advancing the shield machine with the reaction of the concrete box composed of the upper floor board and the lower floor board, and a new concrete box hung from the upper side behind the propulsion jack shrunk in the tail part of the shield machine. A concrete box used for an open shield method in which concrete boxes are sequentially embedded in columns by repeating the installation process of joining to the concrete box as appropriate,
When positioning the concrete box to be installed on the joint surface of the concrete box with a guide pin insertion hole, where the guide pin is inserted and suspended on the existing concrete box,
Provided a cushioning material to the guide pin is divided into left and right guide pins compressive deformation to wrapping,
The guide pins are inserted into the guide pin insertion holes with the guide pins, so that the guide pins are bridged between the guide pin insertion holes between the concrete boxes through the buffer material. A concrete box used in the open shield method, characterized in that the guide pin can follow the movement of the head.

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