JP2008231862A - Movable scaffold device in cutting edge, and earth retaining method for cutting face, using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform the excavation of natural ground ahead of a box body and earth retaining operations for a cutting face, when the box body for constructing an underpass etc. is jacked and buried in the ground, for example, under a rail track across a section under the rail track. <P>SOLUTION: Upper and lower earth-retaining jacks 4 and 6 for pressing upper and lower earth-retaining sheet piles 5A and 5C, which are used for performing earth retaining for upper and lower step portions of the cutting face, against the cutting are arranged on the upper and lower portions of opposed surfaces of both side frame columns of a cutting edge frame 2 of a cutting edge 1 which is mounted at the front end of the box body A, respectively. A scaffold base 7, which is equipped with a scaffold member 8 moved forward and backward by means of a jack for moving the scaffold, is arranged in a vertically ascendable/descendable manner between the earth-retaining jacks 4 and 6 in the cutting edge frame 2. The excavation of the cutting face, the operation of arranging the earth-retaining sheet pile, etc. are performed by using the scaffold member 8 as the scaffold, and the scaffold member 8 is advanced so that the earth-retaining sheet pile 5B for performing earth retaining for a middle step portion of the cutting face by means of a leading end of the scaffold member can be pressed against the cutting face. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is arranged in a blade attached to the front end of a box when burying a box for constructing an underground passage or the like in the ground directly under the track or road across a track or road. The present invention relates to a moving scaffold device that is provided for excavating the face and performing earth retaining work, and a method for retaining the face using the moving scaffold device.

  Conventionally, for example, when an underground passage is constructed by embedding a box made of an underground structure that is an RC concrete structure in the ground under the track, a propulsion blade is attached to the front end opening of the box. The box is propelled while excavating the ground in front of the blade. At this time, during the operation in which the blade edge is penetrated into the ground by propelling the blade edge, it is necessary to retain the face to prevent the face ground taken into the blade edge from collapsing. There is.

As such a soil retaining method, as described in Patent Document 1, a plurality of tie rods are passed between the reach shaft of the box and the face, and the earth retaining sheet pile is connected to the end protruding from the face into the blade edge. In addition, a method of pressing the earth retaining sheet pile against the face by pulling the tie rod on the reach shaft side, or a method of pressing the earth retaining sheet pile against the face with a earth retaining jack from the blade edge side is adopted. At this time, in any method, a retaining sheet pile pressed against the upper stage of the face, a retaining sheet pile pressed against the middle stage part, and a retaining sheet pile pressed against the lower stage part are used.
JP-A-6-323088

  However, according to the earth retaining method using tie rod pulling means, complicated work such as the work of penetrating a plurality of tie rods between the reaching vertical shaft and the face face, the excision work of the extra protruding part, the fixing work to the earth retaining sheet pile, etc. There is a problem in that it requires work, and it takes a lot of labor to arrange the earth retaining sheet pile. On the other hand, according to the method of pressing the earth retaining sheet pile against the face by the earth retaining jack from the blade edge side as in the latter, the above troublesome work is not required, but the middle ground is also pressed against the earth retaining sheet pile by the earth retaining jack. Since it comprises, it is difficult to provide a raising / lowering scaffold in the blade edge as described in patent document 1 by presence of this earth retaining means.

  Therefore, when excavating the upper stage of the face while retaining the middle and lower parts of the face with earth retaining sheet piles, excavation work using a scaffold and installation work of earth retaining sheet piles on the upper stage of the face after excavation are performed. There is a problem that it is difficult.

  The present invention has been made in view of such problems, and the object of the present invention is, of course, not only the upper and lower steps of the face, although the scaffold base is arranged in the blade so as to be movable up and down. In addition, the present invention provides a moving scaffold device in a propulsion blade that can be retained by a retaining sheet pile from the blade edge side, and a method for retaining the face using the movable scaffold device.

  In order to achieve the above object, the moving scaffold device in the propulsion blade according to the present invention is provided in the blade attached to the front end of the box to be propelled and buried in the ground as described in claim 1. A moving scaffold device, a scaffolding frame provided between the side frame columns of the blade edge frame at the blade edge so as to be movable up and down, a scaffolding member provided on the scaffolding frame so as to be movable back and forth via a jack, and A retaining sheet pile pressed against the face by the front end surface of the scaffold member, and the scaffold frame to support the reaction force from the face face acting on the retaining sheet pile by detachably connecting the scaffold frame to the blade frame. It is comprised from the reaction force transmission member.

  In the moving scaffold device configured as described above, the invention according to claim 2 is characterized in that the reaction force transmission member is formed of a pin, and an insertion hole for the pin is provided in the scaffold, while the blade frame facing the insertion hole is provided. A plurality of pin locking holes in which the pins can be engaged and disengaged at regular intervals in the vertical direction are provided in the side frame portion, and the invention according to claim 3 is characterized in that the upper end portion and the lower end portion in the blade edge In addition, there are upper and lower earth retaining jacks that press the earth retaining sheet piles that retain the upper and lower steps of the face against the face, and a scaffolding base is disposed between these upper and lower earth retaining jacks so as to be movable up and down. And

  Further, the invention according to claim 4 is a earth retaining method for retaining the face from the blade edge attached to the front end of the box by using the moving scaffold device when propelling and embedding the box in the ground, By holding the earth retaining sheet piles arranged on these upper and lower steps by means of earth retaining jacks that are attached to the upper and lower inner surfaces of both side frame pillars in the blade edge frame of the blade edge, In the blade frame, the scaffolding member provided on the scaffolding frame provided in the space between the upper and lower earthing jacks is movably moved up and down by the jack, so that the earthing sheet pile arranged in the middle part is moved to the scaffolding member. It is characterized in that it is pressed by the tip of the earth and is retained.

  According to the moving scaffold device in the blade edge of the present invention, a scaffolding frame is provided between the both side frame pillars of the blade edge frame at the blade edge so as to be movable up and down, and a scaffolding member is provided on the scaffolding frame so as to be movable back and forth via a jack. Therefore, it is possible to easily perform excavation work of the upper part of the working face by an operator using the scaffold member as a scaffold and to easily and reliably install the retaining sheet pile after excavation. Since the tip is pressed against the earth retaining sheet pile, a large space can be secured between the scaffold member and the face by retreating the scaffold member by the operation of the jack. The earth retaining sheet pile can be easily disposed on the middle step of the face, and the jack is operated to move the scaffold member forward after the disposition so that the distal end surface of the scaffold member is The earth retaining sheet pile can be firmly pressed against the middle portion of the working face, and it is possible to maintain the pressing condition I.

  In addition, a reaction force transmission member for removably connecting the scaffold frame provided with the scaffold member to the blade frame and supporting the reaction force from the face surface acting on the earth retaining sheet pile on the blade frame. Therefore, the reaction force acting on the earth retaining sheet pile pressing the face can be reliably received by the blade frame via the reaction force transmitting member, and therefore the earth retaining sheet pile is supported on the face by the jack. It is possible to keep the state firmly pressed at all times, and the work in the blade edge frame can be performed safely and efficiently.

  According to the second aspect of the present invention, the reaction force transmission member is a pin, and an insertion hole for the pin is provided in the scaffolding frame, while the side frame portion of the blade frame facing the pin insertion hole is vertically arranged. Since a plurality of pin locking holes to which the pins can be engaged and disengaged are provided at regular intervals, the scaffold base can be easily and reliably connected to and supported by the side frame of the blade edge frame at a desired height position. Therefore, there is no fear that the scaffolding frame will reciprocate in the vertical direction, and the attaching and detaching operation of the retaining sheet pile on the scaffolding member can be easily performed in a stable state.

  Moreover, according to the invention which concerns on Claim 3, the upper and lower earth retaining jacks which respectively press the earth retaining sheet pile retaining the upper and lower steps of the face against the face are disposed at the upper end and the lower end in the blade. Since the above-mentioned scaffolding frame is disposed between the upper and lower earth retaining jacks so as to be movable up and down, the earth retaining sheet pile can be easily and firmly pressed from the blade edge frame to the upper and lower parts of the face by the earth retaining jack. In addition, the scaffold member in the scaffold base can be advanced against the middle stage of the face, and the earth retaining sheet pile can be easily and firmly pressed at the tip.

  Accordingly, the entire face can be pressed evenly by these retaining sheet piles, and when excavating the face ground, the upper and lower steps of the face are held by the retaining sheet piles, and the above-mentioned scaffold member is retained. Uncut upper face can be excavated efficiently by workers. Similarly, when excavating the middle and lower parts of the face, the other steps are held down by the retaining sheet pile in order. You can excavate well.

  Furthermore, according to claim 4, according to the earth retaining method of the face using the above moving scaffold device, the earth retaining part in which the upper and lower steps of the face are attached to the upper and lower inner side surfaces of the both side frame pillars in the edge frame of the edge. Scaffolding by pushing down the retaining sheet piles disposed on the upper and lower step portions by a jack, and in the middle step portion of the face, a scaffold disposed in the space between the upper and lower retaining jacks in the blade frame so as to be movable up and down. By pushing forward the scaffold member provided on the pedestal with a jack, the earth retaining sheet pile disposed on the middle step part is pressed by the tip of the scaffold member to retain the earth retaining member. The removal work of the earth retaining sheet pile, and the excavation work of the upper face of the face can be efficiently performed using the scaffold member as a scaffold, the work of arranging and removing the earth retaining sheet pile from the middle stage of the face, and Excavation work of wings, can be performed with this scaffold member or use may efficiency by keeping to move the scaffold member upward.

Next, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a simplified longitudinal side view showing a state of earth retaining, FIG. 2 is a simplified front view showing a construction state, and FIG. In these drawings, reference numeral 1 denotes a blade mounted on the front end opening of a box A made of an underground structure that is an RC concrete structure to be embedded in the ground such as under a track. At the mouth, a shoe 3 having a front edge formed at the blade edge portion is integrally provided at the lower end of the front rectangular blade edge frame 2, and the front edge is formed at both edges of the blade edge frame 2 at the blade edge. A side wall plate (not shown) is fixed, and the cutting edge frame 2 is spaced at regular intervals in the width direction between the upper end horizontal frame portions 2a1 and 2b1 of the front rectangular frame portions 2a and 2b that are spaced apart at the front and rear. Along with the beam material 2c that is long in the front-rear direction, the front frame portion 2a is fixed to the horizontal frame member 2a1. Both sides frame pillars are integrally fixed to the upper end of the side end 2a2
, 2a2 is inclined obliquely rearward from the upper end toward the lower end, and the lower end thereof is fixed to the shoe 3 integrally. On the other hand, in the rear frame portion 2b, both side frame columns 2b2 and 2b2 whose upper ends are integrally fixed to both side end portions of the horizontal frame member 2b1 are respectively located behind the both side frame columns 2a2 and 2a2 of the front frame portion 2a. It is vertically arranged in a state of being opposed to each other, and its lower end is fixed integrally on the shoe 3.

  Further, on both sides of the front and rear frame portions 2a and 2b, as shown in FIGS. 3 and 5, the horizontal connecting members 2d and 2d are placed at the same height position between the upper facing surfaces of the column frames 2a2 and 2b2 facing front and rear. The upper earth retaining jacks 4 and 4 are attached to the inner side surfaces (opposing surfaces) of these horizontal connecting members 2d and 2d so as to be horizontally oriented in the front-rear direction. The rods of these earth retaining jacks 4 and 4 As shown in FIG. 1, the upper earth retaining sheet pile 5A is configured to be pressed against the upper stage B1 of the face B. Similarly, on both sides of the front and rear frame portions 2a and 2b, horizontally long rectangular lower earth retaining jacks 6 and 6 are attached horizontally between the lower inner surfaces of the column frames 2a2 and 2b2 facing front and rear. The rods of these earth retaining jacks 6 and 6 are extended so that the lower earth retaining sheet pile 5C is pressed against the lower step portion B3 of the face B at the front end surface thereof.

  Moreover, in the space part between the both side frame pillars of the blade edge frame 2, the scaffold base 7 which moves up and down between the said upper and lower earth retaining jacks 4 and 6 is arrange | positioned. As shown in FIGS. 3, 4 and 6, the scaffolding frame 7 has front and rear horizontal frames 7b and 7c between the lower surfaces of the front and rear sides of both horizontal frames 7a and 7a made of I-shaped steel having a long length in the front and rear direction. The scaffold member 8 made of a plate material or a wire mesh having a certain thickness is arranged on the scaffold base 7 so as to be movable in the front-rear direction, and the horizontal rail made of channel steel on both side end surfaces of the scaffold member 8. The members 9a and 9a are fixed over the entire length, and the both horizontal rail members 9a and 9a are pivotally supported on the opposite inner side surfaces of the both side horizontal frames 7a and 7a of the scaffold base 7 so as to be rotatable at appropriate intervals in the front-rear direction. The guide rollers 9b and 9b are engaged and supported so as to be movable in the front-rear direction.

  Scaffolding movement jacks 10 and 10 are mounted on the lower surfaces of both sides of the scaffolding base 7, and the rod ends of these jacks 10 and 10 are connected to brackets 11 protruding from the lower surface of the front part of the scaffolding member 8. By extending and retracting the jacks 10 and 10, the scaffold member 8 is configured to move in and out from the scaffold base in the front-rear direction, and the intermediate earth retaining sheet pile 5B is connected to the middle portion of the face B at the distal end surface of the scaffold member 8 It is configured to hold on to B2.

  Further, the upper edge retaining jacks 4 and 6 extend between the inner side surfaces of the both side frame columns 2a2 and 2a2 of the front frame portion 2a and the inner side surfaces of the both side frame columns 2b2 and 2b2 of the rear frame portion 2b of the blade frame 2. The front vertical guide rails 12 and 12 and the rear vertical guide rails 13 and 13 are fixed to each other, and the scaffold base 7 including the scaffold member 8 is vertically moved along the front and rear vertical guide rails 12 and 13. It is configured to be movable. Specifically, the front and rear leg piece portions 14b are disposed on the upper surfaces of the front and rear portions of the horizontal frames 7a and 7a on the scaffold frame 7 and at the front and rear ends of the upper horizontal frame 14a at the same interval as the front and rear vertical guide rails 12 and 13, respectively. , 14c are integrally provided, and the lower ends of the front and rear leg pieces 14b, 14c of the side gate-shaped guide frames 14, 14 are fixed, and the front and rear leg pieces 14b, 14c are fixed to the front and rear vertical guide rails 12, 13 respectively. Rollers 15 and 15 pivotally supported on the upper and lower portions of the outer side surfaces of the front and rear leg pieces 14b and 14c while being opposed to the inner side surface are rolled up and down on the front and rear vertical guide rails 12 and 13, respectively. It is freely engaged.

  In addition, the scaffold base 7 that can move up and down along the front and rear vertical guide rails 12 and 13 is detachably connected to and supported by the blade frame 2, and the intermediate portion B 2 of the face B is moved forward by the scaffold member 8. There is provided a reaction force transmission member for supporting the reaction force from the face B acting on the intermediate earth retaining sheet pile 5B when it is pressed through the intermediate earth retaining sheet pile 5B to the blade frame.

  As such a reaction force transmitting member, specifically, the upper end of the vertical support frame 16 is attached to the rear inner surface of the horizontal connecting member 2d attached between the upper portions of the front and rear side frame portions 2a and 2b of the blade frame 2. A plurality of pin locking holes 17 are provided in the vertical support frame 16 at small intervals in the vertical direction, and pins that match the pin locking holes 17 are provided at the rear of the horizontal frame 14a of the guide frame 14. As shown in the figure, an insertion hole 18 is provided, and a pin 19 is inserted from the pin insertion hole 18 and locked to a predetermined locking hole 17 in the plurality of pin locking holes 17, thereby allowing the scaffold base 7 Is fixed to and supported by the vertical support frame 16 at the height position.

  As shown in FIGS. 3 and 4, pulleys 20 and 20 are rotatably supported on the front and rear end portions of the horizontal frames 7a and 7a on both sides of the scaffold frame 7, and wire ropes are attached to the front and rear pulleys 20 and 20, respectively. 21 is extended, and one end of the wire rope 21 extending to the front pulley 20 is extended upward and its upper end is connected to the front upper end of the blade edge frame 2, while the rear pulley 20 The wire rope 21 that extends over the wire is extended upward and over the pulley 22 that is pivotally supported on the rear upper end portion of the blade edge frame 2, and then is pulled down and the lower end portion thereof is attached to the blade edge frame. The chain block connected to and supported by the lower end of 2 is wound around a rewinding device 23, and the scaffolding base 7 is moved up and down by operating this winding and rewinding device 23. ing.

  A box A, which is an underground structure, is embedded in the direction crossing the road surface in the lower ground of the road surface, such as a railroad, while excavating the tunnel face using the cutting edge 1 equipped with the moving scaffold device configured as described above. For this purpose, a start side and an arrival side (not shown) of the underground structure are provided in advance with the road surface in between, and an upper surface is provided between the start side and the arrival side as shown in FIGS. The pipe roof P is formed by press-fitting and embedding a large number of steel pipes on which the edge cutting plates F are placed in parallel, and then a box A is provided on the starting side. The blade edge 1 is attached to the front end opening of the box A, the upper end surface of the blade edge frame 2 of the blade edge 1 extends along the lower surface of the rear end portion of the pipe roof P, and the upper floor front end surface of the box A The box A is placed in contact with the rear end surface of the pipe roof P directly with or without the blade frame 2. Constant length box body A while penetrating the cutting edge on the working face B by pressing the surface from the jack (not shown) propels the ground.

  The rear end of the edge cutting plate F is fixed at an appropriate position on the starting side, and therefore the pipe roof P is pushed out to reach a certain length while sliding on the lower surface of the edge cutting plate F by propelling the box A, The extruded pipe roof P is removed by cutting or the like. Moreover, the face B taken into the blade edge 1 by excavation of the blade edge 1 is excavated for every fixed length of propulsion. Then, the box A is embedded under the road surface by sequentially repeating the box A, a certain length of propulsion, and the excavation of the face B corresponding to the excavation length.

  In this burial operation process, when propelling the box A for a certain length, as shown in FIG. 1, the upper part B1, the middle part B2, and the lower part B3 of the face B are previously moved by the earth retaining sheet piles 5A, 5B, 5C. Hold it all over and push the box A for a certain length in this state. At this time, the intermediate earth retaining via the upper and lower earth retaining jacks 4 and 6 and the scaffold member 8 pressing the upper and lower earth retaining sheet piles 5A and 5C in accordance with the advancement of the cutting edge 1 penetrating into the natural ground integrally with the box A. The scaffold moving jack 10 pressing the sheet pile 5B is contracted while maintaining the pressing force against the earth retaining sheet piles 5A to 5C constant. The scaffold member 8 has a pin 19 as a reaction force transmission member formed in the gate-shaped guide frame 14 of the scaffold base 7 when the scaffold base 7 on which the scaffold member 8 is disposed is at a predetermined height position. Since it is fixed at a certain height position by being locked to a pin locking hole 17 drilled in a vertical support frame 16 provided integrally with the blade edge frame 2 through a pin insertion hole 18, a jack for moving a scaffold 10, the intermediate earth retaining sheet pile B2 can be firmly pressed against the face B2 via the scaffold member 8.

  In this way, after the box A is propelled for a certain length while maintaining the state where the face B is fully pressed by the earth retaining sheet piles 5A to 5C, excavation work of the face B is performed. In this operation, first, the upper earth retaining sheet pile 5A that presses the upper earth retaining sheet pile 5A against the upper stage B1 surface of the face B is contracted to release the pressing force, and the intermediate earth retaining sheet pile B2 is pressed against the middle stage B2 of the face B. An operator rides on the scaffold member 8 and performs the work of collecting and removing the upper retaining sheet pile 5A covering the upper step B1 using the scaffold member 8 as a scaffold. As shown in FIG. After removing 5A, use a shovel or the like to manually dig up the ground of the upper face B1.

  After excavating the upper face B1 of the working face, the upper retaining sheet pile 5A is disposed on the excavation surface by using the scaffold member 8 as a scaffold, and the upper retaining sheet pile 5A is pressed against the working face by extending the rod of the upper earth retaining jack 4. Put it in a state. After that, the scaffold member 8 is retracted by contracting the scaffold moving jack 10 to release the pressing force on the intermediate earth retaining sheet pile 5B, and then the intermediate earth retaining sheet pile 5B is recovered and removed. The intermediate retaining sheet pile 5B may be collected and removed using the scaffold member 8 as a scaffold, or may be performed using the inner bottom portion of the blade edge 1 as a scaffold. When the scaffold member 8 is not used, the scaffold base 7 provided with the scaffold member 8 can be lifted and lowered by releasing the pin 19 so as to be fixed to the vertical support frame 16 and then rolled up and rewound. 23 is operated and raised so that it does not interfere with the collection and removal of the intermediate earth retaining sheet pile 5B and the excavation of the middle section B2 of the face after removal.

  As shown in FIG. 9, the excavation operation of the middle face section B2 of the face is performed by raising the scaffold frame 7 to a position near the upper earth retaining jack 4 so that the scaffold frame 7 and the scaffold member 8 do not disturb the excavation. However, if the upper part of the middle face B2 of the face is at a height that is difficult to reach, the scaffold base 7 is stopped at a position that is lower than the height position where the intermediate retaining sheet pile 5B was pressed, The scaffold member 8 may be used as a scaffold to perform excavation work of the middle face B2 of the face by an operator.

  After excavation of the middle section B2 of the face, the intermediate retaining sheet pile 5B is arranged on the excavation surface using the scaffold member 8 as a scaffold or the inner bottom of the blade edge 1 as a scaffold, and then the scaffold base 7 is placed in the middle. A pin insertion hole in which the retaining sheet pile 5B is moved to a position where it can be pressed and the pin 19 as a reaction force transmitting member is drilled in the gate-shaped guide frame 14 of the scaffolding base 7 as described above. The anchor member 8 is fixed by being engaged with a pin retaining hole 17 formed in the vertical support frame 16 provided integrally with the blade edge frame 2 through 18 and the scaffold moving member 10 is extended to advance the scaffold member 8. Then, the intermediate earth retaining sheet pile 5B is pressed with the tip end face, and this intermediate earth retaining sheet pile 5B is pressed against the excavation surface of the face middle step B2 with a predetermined pressure.

  After that, by releasing the pressing force by contracting the lower earth retaining jack 6 that presses the lower earth retaining sheet pile 5C, the lower earth retaining sheet pile 5C is recovered and removed, and the inner bottom portion of the blade edge 1 is removed. As shown in the figure, a worker uses a shovel or the like as a scaffold to manually dig the lower step B3 of the face, and then install the lower earth retaining sheet pile 5C with respect to the excavation surface. The lower earth retaining sheet pile 5C is pressed by the front end surface by extending 6 and the lower earth retaining sheet pile 5C is pressed against the excavation surface of the lower face step B3 of the face with a predetermined pressure.

  In this way, the face is excavated to a depth corresponding to the propulsion length of the fixed length of the box A, and the face is completely pressed down by the earth retaining sheet piles 5A to 5C. For a certain length of time, removing the retaining sheet piles 5A to 5C sequentially, excavating the face B from the upper side, pressing the retaining sheet piles 5A to 5C sequentially against the excavated face B1 to B3, and The box A, which is an underground structure, is buried in a penetrating state in a direction crossing the road surface in the lower ground of the road surface. When the box A has a small cross section, the width of the blade edge 1 is also relatively small. Therefore, the upper and lower earth retaining jacks 4 and 6 are disposed on the inner surfaces of both sides as described above, and the scaffolding frame is provided. One box 7 may be provided, but when the box A has a horizontally-long rectangular large cross-section having a width several times as long as the width, as shown in FIGS. Further, the front and rear side frame columns 2a2 and 2b2 are also arranged at the intermediate portion in the width direction of the blade edge 1, and the side edge columns 2a2 and 2b2 divide the blade edge 1 into several parts in the width direction and face the front and rear sides. The upper and lower earth retaining jacks 4 and 6 are respectively mounted horizontally between the upper and lower opposing surfaces of the frames 2a2 and 2b2 in the front-rear direction, and the scaffold member 8 having the above structure is provided in the space between the adjacent side frame columns. The scaffold base 7 is disposed so as to be movable up and down.

The simplified vertical side view which shows the state which earthed. The simplified front view of the blade edge which shows a construction state. The side view which shows the internal structure of a blade end. Part of the front view. The top view of the one part. The simplified front view of a scaffold apparatus. The simplified plan view. The simplified vertical side view of the state which excavates the upper stage part of a face. The simple vertical side view of the state which removed the middle earth retaining sheet pile. The simplified vertical side view of the state which excavates the upper stage part of a face.

Explanation of symbols

1 Cutting edge 2 Cutting edge frame 4 Upper earth retaining jack
5A-5C Earth retaining sheet pile 6 Lower earth retaining jack 7 Scaffolding frame 8 Scaffolding material
10 Scaffolding jack
17 Pin locking hole
18 pin insertion hole
19 pin

Claims (4)

  A mobile scaffold device provided in a blade attached to the front end of a box to be propelled and buried in the ground, wherein the scaffold is provided to be movable up and down between both side pillars of the blade frame at the blade. A scaffold member provided on the scaffold base so as to be movable back and forth via a jack, a retaining sheet pile pressed against the face by a tip surface of the scaffold member, and the scaffold base detachably connected to the blade frame. And a reaction force transmission member for supporting the reaction force from the face surface acting on the earth retaining sheet pile to the blade frame.   The reaction force transmission member is composed of a pin, and an insertion hole for this pin is provided in the scaffold base, and a plurality of the pins can be engaged and disengaged at regular intervals in the vertical direction on the side frame portion of the blade frame facing the insertion hole. The moving scaffold device in a blade edge according to claim 1, wherein a plurality of pin locking holes are provided.   An upper and lower earth retaining jack that presses the earth retaining sheet pile that retains the upper and lower steps of the face against the face is provided at the upper and lower ends of the blade edge, and the scaffolding can be moved up and down between these upper and lower earth retaining jacks. The moving scaffold device in a blade edge according to claim 1 or 2, wherein the moving scaffold device is disposed.   When retaining the box in the ground, it is a earth retaining method that retains the face from within the blade edge attached to the front edge of the box, and the upper and lower steps of the face are positioned above and below the side frame pillars of the blade edge frame of the blade edge. The earth retaining jacks mounted on the inner surface of the section press the earth retaining sheet piles arranged on the upper and lower steps, and the middle part of the face can move up and down in the space between the upper and lower earth retaining jacks in the blade frame. A face in front of the box, wherein the scaffolding member provided on the scaffolding frame disposed in is pushed forward by a jack, and the retaining sheet pile disposed in the middle step portion is pressed by the tip of the scaffolding member to retain the soil. The method of retaining the earth.

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