JP2009108571A - Open shield method and open shield machine for use in it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an open shield method which enables a jack balance to be maintained on the right and left sides of an open shield machine on a curved construction site, which hardly causes rolling, pitching, etc., and which enables smooth curve construction by facilitating the control of the jacking speed of the open shield machine. <P>SOLUTION: In this open shield method, hydraulic driving systems, which are connected to a plurality of shield jacks disposed in column on the right and left sides of the open shield machine, are independently and separately provided on the right and left sides. The speed and thrust of the shield jack are set different on the inside and outside of a curve in a curved construction area. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an open shield method for constructing underground structures such as water and sewage systems, common grooves, telegraphs / telephones, etc. in an urban area, and an open shield machine used therefor.

  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 press bar 8 made of a frame body made of box steel or mold steel is disposed in front of the concrete box 4, and the open shield machine 1 reacts from the concrete box 4 set rearward. 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.

  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 for propelling the main body of the open shield machine 1, and as shown in FIGS. 4 and 5, the shield jack 2 has a plurality of stages in the left and right positions of the open shield machine 1 and three stages in the illustrated example. Has been placed.

  The drive system of these shield jacks 2 is connected to individual operation panels 12a and 12b for each of the left and right shield jacks 2 as shown in FIG. 6, and each operation panel 12a and 12b is shared via a current divider 13. Connected to the hydraulic pump 14.

  By the way, the amount of movement of the open shield machine 1 is different between the inside and the outside of the curve construction place. For this reason, it is necessary to provide a difference in the stroke amount of the shield jack 2 between the inside and outside (left and right) of the curve.

  At the same time, the propulsion resistance is different between the inside and outside of the curve. For this reason, it is also required to change the thrust in and out of the curve (left and right).

  However, conventionally, since each shield jack 2 is connected to one hydraulic pump 14 via the current divider 13 and the operation panels 12a and 12b as described above, the hydraulic pressure acts equally on all the shield jacks 2.

  As a result, the thrusts of all the shield jacks 2 are all equal. Further, the hydraulic oil discharged from the hydraulic pump 14 is always constant, and the speed of each shield jack 2 cannot be adjusted.

  For this reason, in order to make a stroke difference in the shield jack 2 inside and outside the carp, the shield jack 2 is used only for digging using the shield jack 2 positioned outside the curve, and in order to make a thrust difference, the shield jack 2 is used inside and outside the curve. The number of units used is different.

  However, in such a method, in order to provide a thrust difference, for example, when one is set on the inside, three on the outside, or two on the inside and three on the outside, the thrust difference is only in units of units. It is difficult to obtain the subtle thrust difference required for

  In addition, since the shield jacks 2 that are simultaneously operated extend from the one with the smallest reaction force to each one, the shield jacks 2 are intermittently pressed with the inner or outer shield jacks 2.

  As a result, the balance between the left and right shield jacks 2 differs in the height direction of the open shield machine, and pitching and rolling are likely to occur, which tends to adversely affect the behavior of the open shield machine.

  Furthermore, since the response | compatibility to the complicated construction conditions in a curve construction part will be performed only by ON / OFF operation of each shield jack 2, hydraulic operation becomes complicated.

  And since the shape of the blade edge 11 is diagonally formed inside, it may be dug in the case of curve construction.

  The object of the present invention is to eliminate the inconvenience of the conventional example, maintain the jack balance on the left and right of the open shield machine at the curved construction site, hardly cause rolling and pitching, and the propulsion speed of the open shield machine. Another object of the present invention is to provide an open shield method that can be easily controlled and enables smooth curve construction, and an open shield machine used therefor.

  In order to achieve the above object, the invention according to claim 1 includes, as a construction method, a step of excavating and discharging soil in front of the front or upper surface opening of an open shield machine, and a plurality of columns in the right and left sides of the shield machine. Extending the installed shield jack and moving the shield machine forward with the reaction force of the concrete box, and setting a new concrete box hanging from the top behind the shrunk jack contracted in the tail part of the shield machine In the open shield construction method in which the concrete boxes are sequentially embedded in series by repeating the steps to be appropriately performed, the gist is to vary the speed and thrust of the shield jack on the inside and outside of the curve in the curve construction section.

  According to the first aspect of the present invention, since the speed and thrust of the shield jack are made different between the inside and the outside of the curve in the curve construction portion, all shield jacks can be used. Therefore, compared to the case of controlling the open shield machine by controlling the amount of movement of the open shield machine on the left and right by selecting the shield jack to be used as before and providing a stroke difference in the shield jack, Jack balance can be maintained on the left and right, and subtle thrust differences can be adjusted, making it difficult for phenomena such as rolling and pitching to occur.

  As an open shield machine, the invention according to claim 2 includes a step of excavating and discharging soil in front of the front or top opening of the front portion having a cutting edge at the tip, and a plurality of columns arranged on the right and left of the jack tail portion. The process of extending the installed shield jack and moving the open shield machine forward with the reaction force of the concrete box, and a new concrete box hung from the upper side behind the shield jack shrunk in the jack and tail of the open shield machine In the open shield machine used in the open shield construction method in which the concrete box is sequentially embedded in columns by repeating the steps of lowering and setting as appropriate, the hydraulic pressure connected to a plurality of shield jacks arranged in columns on the left and right of the open shield machine The drive system is independent on the left and right, and this hydraulic drive system is an inverter circuit. It is an Abstract that comprise a hydraulic pump connected.

  According to the second aspect of the present invention, since the hydraulic drive system connected to the shield jacks arranged in series on the left and right of the open shield machine is made independent on the left and right, the pressure adjustment of the hydraulic pump is performed. By doing this, thrust according to the digging resistance can be provided to the left and right hydraulic systems, and by adjusting the flow rate of the hydraulic pump using the inverter circuit, the speed of the left and right shield jacks can be made different The amount of left and right movement can be adjusted.

  The gist of the invention described in claim 3 is that the blade edge is formed in an oblique shape in which the outer shape is inclined inward.

  According to the third aspect of the present invention, since the blade edge is formed in an oblique shape in which the outer shape is inclined inward, the excavation of the outer side of the curve is not performed in the construction of the curved portion, and the excavation is performed. The wall can be consolidated, and a larger lateral ground reaction force can be obtained.

  As described above, the open shield method of the present invention and the open shield machine used for the open shield machine are connected to the left and right separate independent hydraulic systems for the shield jack that propels the open shield machine. Pressure adjustment and flow rate adjustment can be performed, speed difference and thrust difference can be established on the left and right of the open shield machine at the curved construction site, jack balance can be maintained, rolling and pitching are not likely to occur, The propulsion speed of the open shield machine can be easily controlled, enabling smooth curve construction.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional plan view showing a state of an open shield construction method according to an embodiment of the present invention before the shield machine is propelled by a curved portion construction, and will be described from the configuration of the open shield machine of the present invention.

  The basic structure of the open shield machine used in the open shield method of the present invention is the same as that of the conventional example shown in FIGS. 4 and 5, but in the present invention as shown in FIG. 1 as a blade edge (blade structure). The face tip outer side 11a was formed in an oblique shape facing inward.

  The open shield machine 1 is propelled by the left and right shield jacks 2a and 2b which are propulsion jacks as in the prior art, and the drive hydraulic system of the left and right shield jacks 2a and 2b is arranged on the left and right of the shield machine. The jacks 2a and 2b are configured separately and independently.

  FIG. 3 is a block diagram of a drive hydraulic system of the shield jack 2. In the figure, 17 indicates a hydraulic unit, and a hydraulic pump 14a to which an inverter motor 15a is connected as a hydraulic system of the left shield jack 2a is connected to the left operation panel 12a. To the left shield jack 2a. Further, a hydraulic pump 14b to which an inverter motor 15b is connected as a hydraulic system of the right shield jack 2b is connected to the right shield jack 2b via the right operation panel 12b. The left and right operation panels 12a and 12b have a function of designating shield jacks 2a and 2b to be used.

  In the figure, 16 indicates an oil tank.

  In the figure, reference numeral 18 denotes an operation panel for setting the operating conditions of the left and right shield jacks 2a and 2b, and an operation panel for displaying the operation status, and a used number setting unit for setting the number of used left and right shield jacks 2a and 2b as the operation unit. 19. A jack speed ratio setting unit 20 is provided for setting a required jack speed ratio according to a difference in travel amount between the inside and outside of the curve, and a thrust display unit 21 and a speed display unit 22 for the left and right hydraulic pumps 14a, 14b are provided. It has been.

  A control signal from a control unit built in the operation panel 18 is introduced into the inverter motors 15a and 15b, and the hydraulic pumps 14a and 14b provided in the hydraulic unit 17 are connected to the operation panels 12a and 12b of the left and right shield jacks. The operating pressure values from the pressure sensors 24 a and 24 b provided on the pipe are sent to the operation panel 18.

  In the figure, reference numeral 23 denotes a hydraulic pressure / oil amount tuning valve that opens when the left and right hydraulic systems are operated in synchronism, and pipes that connect the left and right hydraulic pumps 14a and 14b and the left and right shield jack operation panels 12a and 12b, respectively. The connecting pipe is disposed.

  Next, a method for constructing a curved portion using the operation panel 18, the hydraulic unit 17, and the shield jacks 2a and 2b will be described. In the curve section, the amount of movement of the shield machine 1 and the excavation resistance differ between the inside and outside of the curve, and the outside of the curve has a larger amount of movement than the inside, and the excavation resistance is also large. After designating the shield jacks 2a, 2b to be used on the panels 12a, 12b, the number of the left and right shield jacks 2a, 2b to be used is input to the used number setting unit 19 of the operation panel 18, and the jack speed ratio setting unit 20 is input. In the excavation work, set and input the right and left jack speed ratios according to the difference in the amount of movement inside and outside the curve.

  Based on the input value, the flow rate and pressure of each oil sent to the left and right hydraulic pumps 14a and 14b are calculated by the control unit built in the operation panel 18, and the calculated values are sent to the inverter motors 15a and 15b as control signals. .

  Based on this, the rotational speed (discharge amount) of the left and right hydraulic pumps 14a, 14b is adjusted to adjust the flow rate, and a difference in speed between the inside and outside of the curved portions of the left and right shield jacks 2a, 2b is given.

  At the same time, the pressures of the left and right hydraulic pumps 14a and 14b are adjusted, and the necessary hydraulic pressure is supplied to the left and right shield jacks 2a and 2b according to the propulsion resistance difference between the inside and outside of the curve. can get.

  The operating pressures of the left and right hydraulic systems are automatically measured by the pressure sensors 24a and 24b and sent to the operation panel 18 as electrical signals. The operation panel 18 takes in this pressure signal and displays the operating status on the thrust display unit 21 and the speed display unit 22.

  By making the hydraulic system connected to the shield jacks 2a, 2b inside and outside the curve independent of each other in this way, thrust according to the digging resistance can be supplied to the left and right hydraulic systems, and an inverter circuit is used. The flow rate adjusting function can forcibly adjust the speed of the shield jacks 2a and 2b inside and outside the curve.

  Accordingly, the balance of the shield jacks 2a and 2b can be maintained on the left and right sides of the shield machine even in the curved construction section, and rolling and pitching are less likely to occur.

  Further, since the thrust required for the shield machine is automatically supplied, the hydraulic operation becomes easy.

  Moreover, since the face tip outer side 11a has an oblique shape facing inward, it is possible to expect a large side ground reaction force without excessive digging at the curved construction part, and to compact the excavation wall.

It is a cross-sectional top view before the shield machine promotion in the curve construction part of the open shield method of this invention. It is a cross-sectional top view after the shield machine promotion in the curve construction part of the open shield method of this invention. It is a control block diagram of the shield jack of the open shield machine used for the open shield method of the present invention. It is a cross-sectional top view of the conventional open shield machine. It is a vertical side view of the conventional open shield machine. It is a control block diagram of the shield jack of the conventional open shield machine. 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 plate 1b Bottom plate 1c Tail part 1d Front part 2 Shield jack 2a, 2b 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 High Adjusting material 8 Press bar 9 Excavator 10 Opening
DESCRIPTION OF SYMBOLS 11 Cutting edge 11a Face front outer side 12,12a, 12b Operation panel 13 Current divider 14, 14a, 14b Hydraulic pump 15a, 15b Inverter motor 16 Oil tank 17 Hydraulic unit 18 Operation panel 19 Number of used setting part 20 Jack speed ratio setting part 21 Thrust Display 22 Speed Display 23 Hydraulic / Oil Volume Tuning Valve 24a, 24b Pressure Sensor

Claims (3)

  The process of excavating and discharging the soil in front of the front or top opening of the open shield machine, and extending the shield jacks arranged in tandem on the left and right of the shield machine to advance the shield machine using the concrete box as a reaction force In the open shield construction method in which the concrete box is sequentially embedded in series by repeatedly repeating the process of suspending and setting a new concrete box from above on the back of the shield jack shrunk in the tail part of the shield machine, The open shield construction method is characterized in that the speed and thrust of the shield jack are different on the inside and outside of the curve in the curve construction section.   The process of excavating and discharging the soil in front of the front or top opening of the front part with a cutting edge at the tip, and extending the shield jacks arranged in tandem on the right and left of the jack and tail part to rebound the concrete box The process of advancing the open shield machine with force and the process of hanging and setting a new concrete box from the top behind the shrunk jack shrunk in the jack and tail of the open shield machine are repeated as necessary. In the open shield machine used in the open shield construction method in which the body is buried in a vertical row, the hydraulic drive system connected to the shield jacks arranged in multiple columns in the left and right sides of the open shield machine is made independent on the left and right sides. The hydraulic drive system is composed of a hydraulic pump to which an inverter circuit is connected. Over Pung shield machine.   The open shield machine according to claim 2, wherein the blade edge is formed in an oblique shape in which an outer shape is inclined inward.

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