JP2013217160A - Open shield machine utilizing concrete box body and open shield method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an open shield machine which can be manufactured at a low cost.SOLUTION: For a first block 21a, a steel machine body 23 which has a cutting edge 22 on a front end and whose upper surface is opened is attached to the front of a concrete box body part 25 incorporating a box body 24 to be built, and propulsion equipment 26 having a steel machine body frame to which a shield jack 27 is disposed is attached to the back. For a second block 21b, the propulsion equipment 26 having the steel machine body frame to which the shield jack 27 is disposed is attached to the back of the concrete box body part 25 incorporating the box body 24 to be built, whose distal end is to be fitted to the propulsion equipment 26 of the first block 21a. For a third block 21c, a steel machine body frame 29 whose upper surface is opened to be a box body installation part 28 is attached to the back of the concrete box body part 25 incorporating the box body to be built, whose distal end is to be fitted to the propulsion equipment 26 of the second block 21c. The steel machine body of the first block 21a and the steel machine body frame of the third block are connected by a traction member 33 provided with an anchorage cone 31 on one end and a tension jack 32 on the other end.

Description

  The present invention relates to an open shield machine using a concrete box for constructing underground structures such as waterworks, sewerage, and underground passages in an urban area, and an open shield machine using the same.

  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 are arranged near the rear end in the vertical direction facing backwards. In the figure, 3 indicates a partition wall.

  As shown in FIG. 12, the open shield construction method constructed using such an open shield machine 1 is such that the open shield machine 1 is installed in the start pit, and the shield jack 2 of the open shield machine 1 is extended to be in the start pit. The open shield machine 1 was moved forward by taking the reaction force against the reaction wall of the first and the first concrete box 4 forming the underground structure was hung from above and shrunk in the tail portion 1c of the open shield machine 1. Set behind the shield 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 pushing angle 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 receives a reaction force from the concrete box 4 set rearward. Take.

  Then, the second concrete box 4 is suspended in the tail part 1 c 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 in line with the advancement of the open shield machine 1, and further this concrete box. Put backfill 5 on the upper surface of 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 opened in the tail part 1c. The grout material 6 is primarily injected into the gap between the inside of the shield machine 1 and the bottom plate 1b below the bottom of the concrete box 4, and the open shield machine 1 is further advanced, and the gap formed here after the bottom plate 1b advances. Further, the back-filling injection material 6 is secondarily injected into the left and right sides of the concrete box 4 to complete the filling of the back-filling injection material.

  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 includes 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.

Among such open shield methods, the body of the open shield machine 1 is divided into a plurality of parts in the front-rear direction, and the reaction force is taken from the other divided body blocks to obtain the ESA method (ENDLESS SELF ADVANNCING METHOD) “Infinite self-propelled forward construction method” As shown in the following patent document, a self-propelled open shield machine 1 that self-propels and moves forward in the same manner as "
Patent No. 2976107

  The ESA method (ENDLESS SELF ADVANNCING METHOD) “infinite self-propelled forward method” is similar in principle to the movement of a beetle insect, and the head is advanced by fixing the tail (reaction force). Next, the head is fixed (reaction force) and the tail moves. This is repeated to advance, and a plurality of (three or more) box culverts are connected with PC steel wires, and hydraulic jacks are installed between and at the end of each box culvert to constitute an ESA facility. The jack pressure is transmitted to each box culvert. When one box culvert is propelled, the friction resistance force due to the earth pressure and its own weight of the other plurality of box culverts is used as a reaction force resistor, and the box culvert is sequentially propelled one by one.

  As shown in FIGS. 9 to 11, the open shield machine 1 divides the machine body into a plurality of parts in the front-rear direction. The shield jack 2 is disposed inside the left and right side wall plates 1a, and the front, rear, and top surfaces are arranged. The body of the open shield machine 1 having an opening is constituted by three or more divided bodies 12a to 12c in the front-rear direction, and the divided bodies 12a to 12c are connected by the first and second propulsion jacks 13a and 13b, respectively. , Using the open shield machine 1 provided with a traction jack 16 on the rearmost divided body 12a, and fixing the other end of the traction member 17 with one end attached to the traction jack 16 to the frontmost divided body 12a. The split bodies 12a and 12b in front of the above are extended by extending the first and second propulsion jacks 13a and 13b provided in the respective split bodies 12a and 12b and taking a reaction force on the rear split body 12c. Part was divided bodies 12a sequentially advanced from the divided body 12c of the end portion is advanced to lead the forward traction jack 16 pulling member 17 by operating the.

  The open shield machine disclosed in Patent Document 1 divides a machine body into a plurality of parts in the front-rear direction, and the steel machine body is larger than a non-divided open shield machine.

  In addition, after the reach shaft is required and the open shield machine is removed from the reach shaft, the part is constructed with a concrete box made in the field or suspended from the reach shaft to install the concrete. It is necessary to join the box row, and it is difficult to treat the inflow pipe at the site of repairing the existing water channel, and there is a possibility that the water cross section cannot be secured.

  The present invention eliminates the inconveniences of the conventional example, can manufacture an open shield machine at a low cost, and is not a more complicated structure than a steel shield machine. The object is to provide an open shield machine using a concrete box that is inexpensive and easy to handle inflow, and can ensure the necessary cross section of water.

  In order to achieve the above object, the present invention provides an open shield machine using a concrete box. First, the body of the open shield machine is an aggregate of a first block, a second block, and a third block. The block consists of a steel machine body with a blade opening at the front end, an open upper surface, and a steel machine body frame with a propulsion jack at the rear, in front of the concrete box that incorporates the box to be installed. Attach the second block with the propulsion equipment by the steel machine body frame with the propulsion jack disposed behind the concrete box part in which the laying box is inserted into the propulsion equipment of the first block. 3 blocks are a steel machine body frame with an open upper surface that becomes the box installation part behind the concrete box part that lays the box into which the tip fits into the propulsion equipment of the second block. Installed as an installation part for the growth box, the steel block of the first block and the frame of the third block were connected by a traction member with a fixing cone at one end and a tension jack at the other end. Secondly, the concrete box part in which the box to be installed is incorporated is the same as the box for forming the underground structure, and a precast or on-site concrete board is arranged outside the gist. To do. In addition, on-site concrete plates are produced by preparing formwork at the site.

  As an open shield construction method, first, a steel machine body with a blade opening at the front end and an open upper surface in front of a concrete box part incorporating a laying box, and steel with a propulsion jack disposed at the rear. A first block having propulsion equipment by a machine body frame, and a steel machine body frame in which a propulsion jack is arranged behind a concrete box portion in which a laying box is inserted into the propulsion equipment of the first block. A steel machine body frame with an open upper surface serving as a box installation part behind a concrete box part in which a second block having a propulsion equipment attached and a box to be installed with a tip fitted into the propulsion equipment of the second block is incorporated. It consists of a third block attached as an installation part of a box for forming an underground structure, and a fixing cone is provided at one end of the steel machine body of the first block and a steel machine frame of the third block, and a tension jack is provided at the other end. The Using an open shield machine connected by a towing member, excavating the inside of the blade edge with an excavator installed on the ground, mounted on the first block using the peripheral friction and bottom friction of the second and third blocks as reaction forces The first block is propelled by the propulsion jack, and the second block is mounted on the second block by the reaction of the peripheral friction and bottom friction of the third block and the peripheral friction and bottom friction of the first block pulled by the traction member. The second block is propelled by the propulsion jack, and the third block is pulled forward by the tension jack using the peripheral surface friction and the bottom surface friction of the first block and the second block as reaction forces. Secondly, the box is installed in the box installation part of the third block and connected to the succeeding box that has been installed, and the box backfilling is performed from the third block box installation part. When it comes to the ground side, During filling with the backfill soil, to stabilize the natural ground, the third is for the subject matter to be left behind after promote complete, open shield machine as laying a box body to a predetermined position.

  According to the first and third aspects of the present invention, since the laying box can be used as a part of the open shield machine, the steel material weight is less than that of the steel shield machine, and the production cost is low.

  Furthermore, because it is an open shield machine that uses a box to be installed rather than a steel shield machine, the inflow pipe processing can be easily performed, and a concrete box section that is larger than the section of the box to be installed is used as an open shield machine. Therefore, the cross section of water flow can be reliably secured at the existing waterway repair site.

  According to the second aspect of the present invention, the concrete box portion incorporating the box to be laid is provided with a precast or on-site concrete plate on the outside of the same box as that for forming the underground structure. By doing so, it can be more than a box cross section that is easily laid without a formwork.

  According to the fourth aspect of the present invention, the box backfilling is performed by connecting the box setting portion of the third block to the succeeding box having been laid, and coming out from the third block box setting portion to the natural ground side. Since it is done at the time, it is possible to stabilize the natural ground.

  According to the fifth aspect of the present invention, the reach shaft can be made unnecessary by leaving the open shield machine as a laying box after propulsion is completed to a predetermined position. The blade edge and the steel machine body frame are left together with the concrete box.

  As described above, the open shield machine using the concrete box and the open shield method of the present invention use the concrete box for a part of the open shield machine, so the open shield machine can be manufactured at low cost, and the steel shield machine Because the structure is not more complicated than that, the preparation period is short, and there is no need for an underground shaft, so the construction cost is low, the inflow treatment is easy, and the water flow section necessary for repairing the existing waterway is ensured. It can be done.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a transverse plan view showing an embodiment of an open shield method using an open shield machine using a concrete box of the present invention, and FIG. 2 is a longitudinal side view of the same.

  First, the open shield machine using the concrete box of the present invention will be described. The open shield machine 21 divides the machine body into a plurality of parts in the front-rear direction. The machine body of the open shield machine is divided into a first block 21a and a second block. 21b and the assembly of the third block 21c. Each of these blocks has a concrete box part 25 incorporating a box 24 to be laid.

  The first block 21a is fitted with a steel machine body 23 having a blade opening 22 at the front end and an open upper surface in front of a concrete box portion 25 incorporating a box 24 to be laid, and a propulsion jack 27 at the rear. The propulsion equipment 26 by the steel machine body frame in which is installed is attached.

  The second block 21b has a concrete box part 25 in which a box 24 to be laid is installed, and a propulsion jack 27 behind the concrete box part 25, the tip of which is fitted into the propulsion equipment 26 of the first block 21a. The propulsion equipment 26 by the steel machine body frame which has been disposed is attached.

  The third block 21c has a concrete box part 25 in which a box 24 to be laid is installed, and a box is installed behind the concrete box part 25, with the tip fitted into the propulsion equipment 26 of the second block 21b. A steel machine body frame 29 having an open upper surface serving as the portion 28 is attached.

  The concrete box portion 25 incorporating the box 24 to be laid is formed by disposing a precast or on-site concrete plate 30 outside the same box 24 for forming an underground structure. These are produced when the open shield machine 21 is assembled, and each block is fixed with a steel part and a bolt or the like. When using precast concrete plates, fix the concrete box and precast concrete plates with anchors. Also, in the case of on-site concrete plate bodies, a concrete plate formwork is prepared and manufactured on site.

  The concrete box portions 25 of the second block 21b and the third block 21c are formed by arranging the boxes 24 in series in this embodiment, and although not shown in the drawing, the boxes 24 are not boxed. Use and fasten with through bolts.

  The tip of the concrete box portion 25 of the second block 21b and the tip of the concrete box portion 25 of the third block 21c are slidably fitted to the propulsion equipment 26 of the first block 21a and the propulsion equipment 26 of the second block 21b, respectively. Relative displacement is possible.

  In addition, the steel machine body frame which forms the steel machine body 23 and the propulsion equipment 26 which have the blade edge 22 in the front end is a steel machine body frame of the cross-sectional U shape which opened the front surface, the rear surface, and the upper surface.

  The propulsion jack 27 is disposed in the upper and lower stages along the left and right side walls in the propulsion equipment 26 toward the rear, and the front end of the concrete box portion 25 incorporating the laying box 24 into which the tip is slidably fitted. Touch.

  The steel machine body 23 of the first block 21a and the steel machine body frame 26 of the third block 21c are connected by a pulling member 33 such as a PC steel wire provided with a fixing cone 31 at one end and a tension jack 32 at the other end. . In the present embodiment, the tension jack 32 is provided in the steel machine body frame 29 of the third block 21c and the fixing cone 31 is provided in the steel machine body 23 of the first block 21a. The tension jack 32 is a center hole jack.

  The pulling member 33 is disposed through the inner space of the steel machine body and the concrete box part 25.

  Next, the open shield construction method of the present invention performed using such an open shield machine 21 utilizing a concrete box will be described with reference to FIGS. In the figure, the vertical line hunting portion indicates the range of frictional resistance.

  FIG. 6 shows the propulsion of the first block 21a, which is performed by the propulsion jack 27. Although illustration is omitted, the inside of the blade edge 22 is excavated with an excavator such as a backhoe installed on the ground, and the peripheral friction and bottom friction of the second block 21b and the third block 21c are used as reaction forces, and the first block 21a This is extended by a propulsion jack 27 mounted on the propulsion equipment 26 to propel the first block 21a.

  FIG. 7 shows the time of propulsion of the second block 21b. The propulsion jack 27 mounted on the second block and the tension jack 32 are operated simultaneously. The peripheral block and bottom friction of the third block 21c and the peripheral friction and bottom friction of the first block 21a pulled by the pulling member 33 are used as reaction forces, and the second block 21b is driven by a propulsion jack mounted on the second block 21b. To promote.

  FIG. 8 shows the time of propulsion of the third block 21c, which is performed by operating the tension jack 32. FIG. The tension jack 32 pulls the third block 21c forward by using the circumferential friction and the bottom friction of the first block 21a and the second block 21b as reaction forces.

  In this way, the open shield machine 21 advances the first block 21a, the second block 21b, and the third block 21c sequentially to open a space in front of the box 24 at the front end of the column of the existing box 24, After laying the crushed stone 34, a new box 24 is set on the crushed stone 34, and a backfill 35 is applied on the existing box 24.

  In the backfilling, first, a box is installed in the box installation portion of the third block 21c and connected to a subsequent box that has been laid. And when it comes out to the ground side from a 3rd block box installation part, it fills with the backfill soil and the gap with a natural ground. By doing so, it is possible to stabilize the natural ground.

  In this way, the open shield machine 21 is composed of the first block 21a, the second block 21b, and the third block 21c, so that the open shield machine 21 is self-propelled without taking a reaction force on the concrete box 4 by making each other a reaction force. You can move forward in the formula.

  Thereafter, the same process is repeated.

  When it reaches, after removing the propulsion jack installed in the propulsion equipment 26 of the open shield machine 21, the concrete box part is pulled by the traction member, and the box of the first block 21a, the second block 21b, and the third block 21c. Connect the parts and remove the traction member and tension jack.

  Then, the space between the concrete box 25 behind the third block 21c and the existing box 24 behind the third box 21c is sealed with concrete or the like to complete the entire laying box.

It is a cross-sectional top view which shows one Embodiment of the open shield construction method using the open shield machine using the concrete box of this invention. It is a vertical side view which shows one Embodiment of the open shield construction method using the open shield machine using the concrete box of this invention. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 3 is a cross-sectional view taken along line B-B in FIG. 2. It is CC sectional view taken on the line in FIG. It is a top view of the 1st process of the open shield construction method using the open shield machine using the concrete box of the present invention. It is a top view of the 2nd process of the open shield construction method using the open shield machine using the concrete box of this invention. It is a top view of the 3rd process of the open shield construction method using the open shield machine using the concrete box of this invention. It is a partially cutaway plan view showing a conventional example. It is a vertical side view which shows a prior art example. It is a partially cutaway front view showing a conventional example. It is explanatory drawing which shows the outline | summary of an open shield construction method. It is a perspective view of the box laid by the open shield method.

DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a ... Side wall plate 1b ... Bottom plate 1c ... Tail part 1d ... Front part 1e ... Jack part 2 ... Shield jack 3 ... Bulkhead 4 ... Concrete box 4a ... Left side board 4b ... Right side board 4c ... Upper floor board 4d ... Lower floor board 5 ... Backfill 6 ... Grout material 7 ... Height adjusting material 8 ... Pushing angle 9 ... Excavator 10 ... Opening 11 ... Cutting edge 12a, 12b, 12c ... Divided body 13a ... First propulsion jack 13b ... Second Propulsion jack 14 ... side plate 15 ... hinge 16 ... traction jack 17 ... traction member 18 ... fixing tool 19 ... propulsion jack 21 ... open shield machine 21a ... first block 21b ... second block 21c ... third block 22 ... blade 23 ... steel machine body 24 ... box 25 ... concrete box part 26 ... propulsion equipment 27 ... propulsion jack 28 ... box installation part 29 ... steel machine body frame 30 ... concrete Body 31 ... fixing cone 32 ... tension jack 33 ... pulling member 34 ... foundation Crushed 35 ... backfilling

Claims (5)

The body of the open shield machine is an aggregate of the first block, the second block, and the third block,
The first block is propelled by a steel machine body frame with a blade opening at the front end and an open top surface, and a steel machine body frame with a propulsion jack at the rear, in front of the concrete box part that incorporates the box to be installed. Install the equipment,
The second block is equipped with a propulsion facility by a steel machine body frame in which a propulsion jack is arranged behind a concrete box portion in which a laying box is inserted into the propulsion facility of the first block.
The third block has a steel machine frame with an open upper surface serving as a box installation part behind the concrete box part in which a laying box is inserted into the propulsion equipment of the second block.
An open shield using a concrete box, wherein the steel machine body of the first block and the steel machine body frame of the third block are connected by a pulling member having a fixing cone at one end and a tension jack at the other end. Machine.   2. The concrete box using the concrete box according to claim 1, wherein the concrete box part incorporating the box to be laid is formed by disposing a precast or on-site concrete board outside the same box as that for forming an underground structure. Open shield machine. A steel machine body with a blade opening at the front end and an open top surface, and a propulsion facility with a steel machine body frame with a propeller jack installed at the rear is attached to the front of the concrete box that incorporates the box to be installed. 1 block, the 2nd block which attached the propulsion equipment by the steel machine body frame which arrange | positioned the propulsion jack behind the concrete box part which built the laying box which a front end fits into the propulsion equipment of the said 1st block, A third block in which a steel machine frame with an open upper surface serving as a box installation part is attached to the rear of a concrete box part in which a laying box is inserted into the propulsion equipment of the second block; Using an open shield machine in which a steel machine frame of 1 block and a steel machine frame of the third block are connected to each other by a traction member having a fixing cone at one end and a tension jack at the other end,
Drill the inside of the blade with an excavator installed on the ground,
Using the peripheral friction and bottom friction of the second block and the third block as reaction forces, the first block is propelled by the propulsion jack mounted on the first block,
The second block is propelled by the propulsion jack mounted on the second block, using the circumferential friction and bottom friction of the third block and the circumferential friction and bottom friction of the first block pulled by the traction member as reaction forces,
The tension jack pulls the third block forward, with the peripheral and bottom friction of the first block and second block as reaction forces,
Hereinafter, an open shield method characterized by repeating the same steps.   For laying the box, place the box in the box installation section of the third block and connect it to the succeeding box that has already been installed. The open shield construction method according to claim 3, wherein the ground is stabilized by filling the gap with the ground with backfilling soil.   The open shield construction method according to claim 3 or 4, wherein the open shield machine is left as a laying box after completion of propulsion to a predetermined position.

Images