JP6321710B2 - Concrete box for open shield method - Google Patents

Description

The present invention relates to a concrete box making material used in the open shield method of applying water supply and sewerage, underground structures underpass such as city.

  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.

  5 and 6 schematically show an open shield machine 1, which is a shield machine having left, right and left side wall plates and bottom plates connected to the side wall plates, 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 flexible seal is provided by interposing a sealing material 13 such as rubber 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.

Although it exists also in the following patent document, as shown in FIG. 9, as a positioning for hanging a new concrete box 4 in the tail part 1b of the open shield machine 1 and connecting it to the existing concrete box 4, it is concrete. A guide pin insertion hole 15 having a circular cross section is formed in the joint surface of the box 4, and a round bar-shaped guide pin 20 is inserted into the guide pin insertion hole 15 to connect the concrete boxes 4 at the front and rear positions to each other. Yes.
Utility Model Registration No. 51898

  Since the guide pin 20 inserted into the guide pin insertion hole 15 is inserted in a fixed state with little play, it will resist the vertical and horizontal movements of the concrete box 4 during an earthquake. It becomes an impediment to making a flexible 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. The object is to provide a concrete box for the open shield method.

In order to achieve the above object, the present invention as a concrete box for the open shield method is provided with a propulsion jack inside the left and right side wall plates, and forward of the front or upper surface opening of the open shield machine having the front, rear and upper surfaces opened. Excavating and discharging the earth and sand, extending the propulsion jack and advancing the shield machine against the concrete box consisting of the left and right side panels, upper floor board and lower floor board, and shrinking in the tail part of the shield machine A concrete box for the open shield method in which new concrete boxes are suspended from the upper side of the propulsion jack, and the installation process of joining the existing concrete box to the existing concrete box is repeated as appropriate. The guide pin insertion hole is provided in the joint surface of the concrete box, and the guide pin is inserted here to make the existing concrete box When positioning mounting the Kudasu concrete box-body Ri, wrapped length of the guide pin in the buffer material by hard rubber, the guide pin is the core material of the cushioning material, cushioning material can cut open by the guide pin central portion The guide pin insertion hole is made to be able to follow the guide pin with respect to the forward / backward or up / down / left / right movement of the concrete box by contacting the buffer material inserted together with the guide pin. .

  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.

Moreover, since the guide pin is wrapped in a buffer material as a core and has a cylindrical shape, the buffer material is easily inserted into the guide pin insertion hole together with the guide pin of the core material.

  In addition, after the insertion, the buffer material comes into contact with the guide pin insertion hole, but if the concrete box is greatly displaced up and down or left and right due to an earthquake or the like, the buffer material not only plastically deforms, but also the central part of the guide pin The guide pin can follow the vertical and horizontal movements of the concrete box without being restrained by the cushioning material.

  As described above, the concrete box for the open shield method of the present invention and the guide pin used therefor are a case where a flexible joint is provided between the concrete boxes and the concrete box suspended from the existing concrete box is used. Even when connecting the front and rear concrete boxes with guide pins for positioning, the guide pins can follow the mutual movement of the concrete boxes allowed by the flexible joint. It does not become a hindrance to doing.

  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, and extending the propulsion jack 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.

The guide pin 17 of the present invention is a round bar-shaped metal body, and the entire length of the guide pin 17 is covered with a cushioning material 18 made of hard rubber to form a cylindrical shape.

  The cushioning material 18 is a horizontal cylinder, and the guide pin 17 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. Furthermore, the length of the buffer material 18 and the guide pin 17 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.

  That is, the guide pin 17 is a core material of the buffer material 18, and the buffer material 18 is cut at the central portion of the guide pin 17 so as to be opened to the left and right by the cutting portion 21.

  In this way, the buffer material 18 made of hard rubber is provided on the guide pin 17, and the guide pin is in contact with the guide pin insertion hole 15 to move the concrete box 4 back and forth or up and down and left and right. Can be followed.

  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. 1 shows the use of guide pins, and the gap between the concrete boxes 4 is about 3 mm as an example.

  FIG. 2 shows a state in which the concrete box 4 is pulled out, and the gap between the concrete boxes 4 is increased to about 13 mm as an example, and the concrete box 4 behaves so that the joints are opened. Since it continues to straddle between the guide pin insertion holes 15 of the body 4 and continues to abut against the guide pin insertion holes 15, the guide pins 17 may fall off or hit the guide pin insertion holes 15 and hinder the flexible joint. There is no.

  FIG. 3 shows a bent state, in which the gap between the concrete boxes 4 is expanded to about 13 mm as an example, and the concrete boxes 4 behave so that the joints open, but the buffer material 18 is compressed and deformed. The guide pin 17 follows the displacement up and down or left and right of the concrete box 4.

  Furthermore, when the joint opening of the concrete box 4 is large, the cushioning material 18 opens at the cut portion 21 in the center portion of the guide pin, and the guide pin 17 is not restrained by the cushioning material 18 by this opening, and the concrete box. Can follow the movement of up, down, left and right.

It is a vertical side view of the principal part which shows the time of use of a guide pin in one Embodiment of the concrete box for open shield methods of this invention. It is a vertical side view of the principal part which shows the pulling-out state of the guide pin at the time of earthquake in one Embodiment of the concrete box for open shield methods of this invention. It is a vertical side view of the principal part which shows the bending state of the guide pin at the time of an earthquake in one Embodiment of the concrete box for open shield methods 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. It is a vertical side view which shows a prior art example.

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 20 ... Guide pin 21 ... Cutting location

Claims (1)

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. It is a concrete box for the open shield method in which the concrete box is sequentially embedded in columns by repeating the installation process of joining to the concrete box as appropriate,
A guide pin insertion hole is provided in the joint surface of the concrete box, and when the positioning of the concrete box to be hung on the existing concrete box is performed by inserting the guide pin here, the entire length of the guide pin is buffered with hard rubber. The guide pin is a core material of the buffer material, the buffer material is cut openably at the center of the guide pin, and the buffer material inserted together with the guide pin comes into contact with the guide pin insertion hole so that the concrete box A concrete box for the open shield method, characterized in that the guide pin can follow the movement of the body back and forth or up and down and left and right.

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