JP4295272B2 - Friction cut plate used in open shield method and its fixing method - Google Patents

Description

  The present invention relates to a friction cut plate used in an open shield construction method for constructing underground structures such as water and sewerage systems, common grooves, telegraphs and telephones, and other underground passages, and a fixing method thereof.

  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 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 earth removal process, advance process, and concrete box 4 setting process are repeated as appropriate, and the concrete boxes 4 are sequentially left in the ground as the open shield machine 1 moves forward. Put backfill 5 on the upper surface of the body 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.

  In such an open shield method, as described above, excavation and earth removal are performed by an excavator 9 such as an excavator installed on the ground, and the concrete box 4 is set on the tail portion 1c of the open shield machine 1 on the ground. It will be carried out with a lifting machine such as an installed crawler crane.

  Therefore, when crossing directly under structures such as bridge girders and large pipes, the excavator and the lifting machine cannot be arranged in these places, and the construction of the open shield method becomes impossible.

  Therefore, as described above, there are obstacles such as bridge girders above the construction site, and even when crossing under them, the open shield machine used for the open shield method is installed as it is without being affected by this obstacle The following construction methods are available for construction of underground structures that can be used to construct underground structures and immediately move to the open shield construction method after passing obstacles and continue construction.

  As shown in FIG. 19, when the main push jack 13 is installed in the start shaft 14, and when crossing the lower part of the obstacle, the front shield of the open shield machine 1 is excavated and earthed, and the open shield machine 1 and the concrete box are combined. 4 is pushed out by the main push jack 13 installed in the start shaft 14, and a new concrete box 4 is arranged between the main push jack 13 and the pushed concrete box 4, and a propulsion process is repeated to repeat the push. It is incorporated in the shield method.

  And in the open shield method including such a propulsion process, the entire concrete box 4 with the backfill 5 on the upper surface is pushed out by the main push jack 13, so that the concrete box 4 moves forward. The backfill 5 may also move. Such movement of backfilling soils hinders the opening of traffic on the upper part of the installed box after backfilling.

  Therefore, as a means for solving such inconvenience, a friction cut plate 12 is disposed between the concrete box 4 and the backfill 5 as shown in FIG. This friction cut plate is made of, for example, a steel plate having a thickness of about 6 to 9 mm and a width substantially equal to the width of the concrete box 4. Then, it is sequentially coupled to the friction cut plate 12 already installed on the upper surface of the concrete box 4.

  As a joining method, for example, there is welding as in the box-type roof method.

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

  As described above, the friction cut plate 12 is successively added from the start pit as the concrete box 4 is propelled. The friction cut plate 12 is fixed by the fixing member 15 only on the start shaft 14 side. Then, after the friction cut plate 12 is installed and fixed, only the concrete box 4 is advanced so as to slide under the friction cut plate 12.

  For this reason, when the extension of the laid concrete box 4 becomes long and the frictional resistance between the concrete box 4 and the friction cut plate 12 increases, deformation due to the elongation of the friction cut plate 12 occurs, and this causes the upper embedding to be buried. The return soil 5 is moved, the friction cut plate 12 is broken, or the fixing member 15 of the friction cut plate 12 of the start shaft 14 is deformed. In some cases, the start shaft 14 is also deformed.

  The object of the present invention is to solve the above-mentioned inconvenience, when a friction cut plate is laid on the top of the concrete box and the concrete box is propelled by cutting the edge with the backfill soil and propelling the concrete box. Even if the frictional resistance with the cut plate increases, the backfilling soil can be moved and the friction cut plate can be prevented from being broken. It is an object of the present invention to provide a friction cut plate used in an open shield construction method and a fixing method thereof.

In order to achieve the above-mentioned object, the invention according to claim 1 includes a step of excavating and discharging soil in front of the front or top opening of an open shield machine as a friction cut plate, and extending a propulsion jack. The process of advancing the shield machine with the reaction of the concrete box as the reaction force 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 open shield machine are repeated in sequence as appropriate. In the method of embedding concrete boxes in columns and backfilling the upper part of the concrete box, excavate and excavate the front of the open shield machine, and extrude the open shield machine together with a push jack, and this extruded jack and the extruded concrete Combined with a propulsion process that repeats extrusion by placing a new concrete box between the box In open shield method, a friction cutting plate disposed on the upper surface of the concrete a box body promoting step of the concrete box making bodies, as displacement preventing member to increase the friction of the back soil filling the upper surface of the friction-cut plate, The gist of the invention is that either L-shaped steel or U-shaped groove-shaped steel is attached with connecting bolts that connect the front and rear friction cut plates .

  According to the first aspect of the present invention, the friction cut plate and the backfill soil can be integrated by the displacement preventing member provided on the upper surface of the friction cut plate, and the concrete box and the friction cut plate can be used when the concrete box is propelled. Even if the frictional resistance increases, the backfilling soil can be moved and the friction cut plate can be prevented from breaking.

The invention according to claim 2 is a method of fixing the friction cut plate, the step of excavating and discharging soil in front of the open shield machine or the front opening of the open shield machine, and the reaction of 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 upper side behind the propulsion jack shrunk in the tail part of the open shield machine are repeated as necessary, and the concrete boxes are successively arranged in columns. In the method of burying and backfilling the upper part of the concrete box, the front of the open shield machine is excavated and excavated, and the open shield machine is pushed out with a main jack installed in the start shaft, and this main jack and the extruded concrete box are pushed out. Combined with a propulsion process that repeats extrusion by placing a new concrete box between the body In the open shield method, the arranged friction-cut plate to the upper surface of the concrete a box body promoting step of the concrete box making body, the rear end of the friction-cut plate girder-like plate fixed member erection on top of the concrete box-body The plate fixing material is fixed to the plate fixing steel material fixed to the earth retaining material of the starting shaft by welding, and the plate fixing steel material is disposed obliquely with respect to the member attached to the plate fixing material and the member. The gist is that each member is welded to the earth retaining material .

  According to the second aspect of the present invention, since the plate stopper to which the friction cut plate is fixed is fixed to the start shaft retaining material by welding, the friction cut plate is firmly fixed. Therefore, the structure of the start shaft and the fixed part of the friction cut plate, the friction cut plate, and the entire backfilling soil at the top of the laying box are integrated, and construction can be performed with the traffic at the top of the box open immediately after backfilling. It becomes possible.

  The present invention as set forth in claim 3 includes a step of excavating and discharging earth and sand ahead of the front or upper surface opening of the open shield machine, and a step of extending the propulsion jack and advancing the shield machine using the concrete box as a reaction force. And the process of hanging and setting a new concrete box behind the propulsion jack shrunk in the tail part of the open shield machine from above, and then burying the concrete boxes in tandem one after another For excavation and excavation, the front of the open shield machine is excavated and dumped, and the open shield machine is pushed out with the main jack installed in the start shaft, and new concrete is placed between the main jack and the extruded concrete box. In the open shield method combined with a propulsion process that repeats extrusion by placing a box, the concrete The friction cut plate is arranged on the top surface of the concrete box in the propelling process of the box, the rear end of the friction cut plate is fixed to the plate stopper, the stopper jack is attached to the plate stopper, and the stopper jack is attached. The gist is that it is fixed to the press bar for propelling the concrete box installed in the start shaft with PC steel wire.

  According to the third aspect of the present invention, the plate stopper to which the friction cut plate is fixed is firmly fixed to the press bar installed on the start shaft side via the stopper jack and the PC steel wire. Therefore, the structure of the start shaft and the fixed part of the friction cut plate, the friction cut plate, and the entire backfilling soil at the top of the laying box are integrated, and construction can be performed with the traffic at the top of the box open immediately after backfilling. It becomes possible.

  As described above, the friction cut plate used in the open shield method of the present invention and the fixing method thereof are constructed by laying the friction cut plate on the top of the concrete box and cutting the edge with the backfill soil. When propelling, even if the friction resistance between the concrete box and the friction cut plate increases, the fixed part of the start shaft and the friction cut plate, the friction cut plate, and the entire backfill soil above the laying box are integrated. Because of the structure, it is possible to prevent the backfilling soil from moving following the promotion of the concrete box and to prevent the friction cut plate from rupturing. The workability can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a first embodiment of a friction cut plate used in the open shield method of the present invention. Since the open shield method using the friction cut plate of the present invention is the same as the conventional example, The detailed description in is omitted.

  As mentioned above, there are obstacles such as bridge girders above the construction site, and even when crossing below it, the open shield machine used in the open shield construction method is installed as it is and the underground structure is not affected by this obstacle The following construction methods are available for construction of underground structures that can be used for construction, and after the obstacle has passed, the construction can be continued immediately by moving to the open shield construction method.

  Also in the open shield method in which the present invention is implemented, when there is an obstacle and crosses below it, a push jack 13 is installed on the start shaft 14 as shown in FIG. After excavation and earthing, the open shield machine 1 and the concrete box 4 are pushed out by the main pushing jack 13 installed in the start shaft 14, and a new concrete box is formed between the pushing jack 13 and the extruded concrete box 4. 4 is installed in the open shield construction method to repeat extrusion. In the figure, 16 indicates a bearing wall.

  In the propulsion step, a friction cut plate 12 is disposed between the backfill 5 on the top of the concrete box 4 and the concrete box 4 to cut the edge between the concrete box 4 and the backfill 5. Although the backfilling soil 5 is prevented from moving with the propulsion of the concrete box 4, if the entire length of the concrete box 4 to be laid becomes long, the friction cut plate 12 is deformed and the backfilling soil 5 is moved. May move.

  In order to cope with this, the present invention has a structure of the friction cut plate 12, and as shown in FIGS. 1 and 2, an L-shaped steel 17 as a detent member for increasing the friction of the backfill 5 is provided on the upper portion of the friction cut plate 12. Fixed to.

  The L-shaped steel 17 is fixed to the friction cut plate 12 by fixing the L-shaped steel 17 at the same time with the connecting bolts 18 used when the ends of the front and rear friction cut plates 12 are overlapped and joined.

  As a result, as shown in FIG. 3, the L-shaped steel 17 as an anti-slipping material is disposed at the joint location of the front and rear friction cut plates 12 by the connecting bolts 18. Thereby, the L-shaped steel 17 becomes a friction resistance material, and the friction cut plate 12 and the backfilling soil 5 can be integrated, and the movement of the backfilling soil 5 can be reliably prevented.

  4 to 6 show a second embodiment of the friction cut plate 12, which uses a groove steel 19 having a U-shaped cross section as a slip stopper, and FIGS. 7 to 9 show the first embodiment as a third embodiment. What joined the H-shaped steel 20 to the side part of the L-shaped steel 17 of a form was used. Which one of the first to third embodiments is used as the slip prevention material may be determined according to the weight of the backfill soil 5 on the upper portion of the concrete box 4, and as the weight increases. Select one with a large frictional resistance.

  As described above, the anti-slip material is provided on the upper portion of the friction cut plate 12 so that the friction cut plate 12 and the backfill soil 5 are integrated, but the fixing portion of the friction cut plate 12 is fixed to the start shaft 14. By doing so, it can be set as the structure which integrated the fixed part of the starting shaft 14 and the friction cut plate 12, the friction cut plate 12, and the backfill soil 5 of the upper part of the concrete box 4 integrally.

  Next, a method of fixing the friction cut plate 12 to the start shaft 14 will be described. 10 to 13 show a first example of the fixing method, in which the end of the friction cut plate 12 in the last row is fixed to a girder-shaped plate fixing member 21 that is installed on the concrete box 4 and this plate fixing is performed. The material 21 was fixed to a plate-stopping steel material 22 fixed to the earth retaining material 23 of the start shaft 14 by welding.

  The plate stopper steel material 22 is composed of a member provided together with the plate fixing material 21 and a plurality of members disposed obliquely with respect to this member, and all the members are welded to the earth retaining material 23. Therefore, the friction cut plate 12 is eventually fixed to the earth retaining material 23 and firmly fixed to the start shaft 14 side, and the movement of the friction cut plate 12 is prevented, and as a result, the backfill soil 5 Movement is also prevented.

  FIGS. 14 to 17 show a second example of the fixing method, in which a plate stopper steel material 22 in which a stopper jack 24 is attached to the plate fixing material 21 in place of the oblique plate stopper steel material 22 which was a component of the first example. Fixed to.

  Then, the PC steel wire 25 connected to the stopper jack 24 is connected to the box propulsion press bar 26 of the main push jack 13 by the fixing tool 27.

  Accordingly, even when the friction cut plate 12 is about to move during the propulsion of the concrete box 4, the plate stopper steel material 22 can be pulled back to the start shaft 14 side by operating the stopper jack 24. The plate fixing member 21 fixed to 22 can also be pulled back to the start shaft 14 side, and the movement of the friction cut plate 12 can be prevented. As a result, the movement of the backfill soil 5 can also be prevented.

  Since the friction cut plate 12 is firmly fixed as described above, there is no problem even if the friction cut plate 12 is fixed only at the start shaft 14. And the fixed part of the start shaft 14 and the friction cut plate 12, the friction cut plate 12, and the entire backfill soil 5 on the top of the concrete box 4 can be integrated, and the start shaft 14 can be deformed. The elongation and breakage of the friction cut plate 12 and the movement and deformation of the backfill 5 can be suppressed, and construction (box promotion) with the traffic on the top of the concrete box 4 open is also possible.

It is a vertical side view of the state attached to the concrete box which shows 1st Embodiment of the friction cut plate used for the open shield construction method of this invention. It is a side view which shows 1st Embodiment of the friction cut plate used for the open shield construction method of this invention. It is a top view of the state attached to the concrete box which shows 1st Embodiment of the friction cut plate used for the open shield construction method of this invention. It is a vertical side view of the state attached to the concrete box which shows 2nd Embodiment of the friction cut plate used for the open shield construction method of this invention. It is a side view which shows 2nd Embodiment of the friction cut plate used for the open shield construction method of this invention. It is a top view of the state attached to the concrete box which shows 2nd Embodiment of the friction cut plate used for the open shield method of this invention. It is a vertical side view of the state attached to the concrete box which shows 3rd Embodiment of the friction cut plate used for the open shield construction method of this invention. It is a side view which shows 3rd Embodiment of the friction cut plate used for the open shield method of this invention. It is a top view of the state attached to the concrete box which shows 3rd Embodiment of the friction cut plate used for the open shield construction method of this invention. It is a top view which shows the 1st example of the fixing method of the friction cut plate in the open shield method of this invention. It is a vertical side view which shows the 1st example of the fixing method of the friction cut plate in the open shield method of this invention. It is a vertical front view which shows the 1st example of the fixing method of the friction cut plate in the open shield method of this invention. It is a vertical side view of the principal part which shows the 1st example of the fixing method of the friction cut plate in the open shield method of this invention. It is a top view which shows the 2nd example of the fixing method of the friction cut plate in the open shield method of this invention. It is a vertical side view which shows the 2nd example of the fixing method of the friction cut plate in the open shield method of this invention. It is a vertical front view which shows the 2nd example of the fixing method of the friction cut plate in the open shield method of this invention. It is a vertical side view of the principal part which shows the 2nd example of the fixing method of the friction cut plate in the open shield method of this invention. It is explanatory drawing of the open shield construction method which uses the friction cut plate of this invention. It is explanatory drawing of the open shield construction method using the conventional friction cut plate. 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 4c Lower floor board 5 Backfill soil 6 Grout material 7 Height adjustment material 8 Press Bar 9 Excavator 10 Opening
DESCRIPTION OF SYMBOLS 11 Cutting edge 12 Friction cut plate 13 Main pushing jack 14 Starting shaft 15 Fixing member 16 Bearing wall 17 L type steel 18 Connection bolt 19 Groove type steel 20 H type steel 21 Plate fixing material 22 Plate stopper steel material 23 Earth retaining material 24 Stopper jack 25 PC steel Line 26 Press bar 27 Fixing tool

Claims (3)

In the process of excavating and discharging soil in front of the front or top opening of the open shield machine, extending the propulsion jack and advancing the shield machine with the concrete box as a reaction force, and in the tail part of the open shield machine Open shield is a construction method in which a new concrete box is suspended from the upper side of the shortened propulsion jack and the process of suspending and setting is repeated as necessary to bury the concrete box in series and backfill the upper part of the concrete box. Combined with a propulsion process that excavates and discharges the front of the machine, pushes the open shield machine together with a push-out jack, places a new concrete box between the push-out jack and the extruded concrete box, and repeats the push. In the open shield method, the top surface of the concrete box is A friction cutting plate arranged, as displacement preventing member to increase the friction of the backfill soil to the upper surface of the friction cutting plate, the front and rear friction cutting plates either L-type steel or a U-shaped groove type steel Friction cut plate used in the open shield method, characterized by being attached with connecting bolts to be joined . In the process of excavating and discharging soil in front of the front or top opening of the open shield machine, extending the propulsion jack and advancing the shield machine with the concrete box as a reaction force, and in the tail part of the open shield machine Open shield is a construction method in which a new concrete box is suspended from the upper side of the shortened propulsion jack and the process of suspending and setting is repeated as necessary to bury the concrete box in series and backfill the upper part of the concrete box. Excavate and remove the front of the machine, push the open shield machine together with the main jack installed in the start shaft, and place a new concrete box between the main jack and the extruded concrete box. In the open shield method combined with repeated propulsion processes, the concrete box Friction cut plates were disposed on the upper surface of the REITs a box body, the rear end of the friction-cut plate fixed to the girder-like plate fixed member erection on the concrete a box body, earth retaining material starting pit the plate fixing member The plate fixing steel material is fixed to the plate fixing steel material fixed by welding to the plate fixing steel material, and the plate fixing steel material is composed of a member provided together with the plate fixing material and a plurality of members arranged obliquely with respect to the member. A method for fixing a friction cut plate, wherein the friction cut plate is also welded to the earth retaining material .   In the process of excavating and discharging soil in front of the front or top opening of the open shield machine, extending the propulsion jack and advancing the shield machine with the concrete box as a reaction force, and in the tail part of the open shield machine Open shield is a construction method in which a new concrete box is suspended from the upper side of the shortened propulsion jack and the process of suspending and setting is repeated as necessary to bury the concrete box in series and backfill the upper part of the concrete box. Excavate and remove the front of the machine, push the open shield machine together with the main jack installed in the start shaft, and place a new concrete box between the main jack and the extruded concrete box. In the open shield method combined with repeated propulsion processes, the concrete box A friction cut plate is arranged on the upper surface of the REIT box, the rear end of the friction cut plate is fixed to a plate stopper, a stopper jack is attached to the plate stopper, and this stopper jack is made of PC steel wire. A method for fixing a friction cut plate, characterized in that it is fixed to a press bar for concrete box propulsion installed in 1.

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