JP2010013905A - Excavated soil treating system in shield method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an excavated soil treating system in a shield method capable of reducing construction period and cost, protecting environment, and saving an area for a starting base when a shield with a super large cross section and a long-distance shield are constructed. <P>SOLUTION: This excavated soil treating system includes a solid matter recovering system section 40 which cuts out and excavates an earth in a solid state by a cutter head 22, conveys the cutout and excavated solid recovered matter to a primary filter 42 in a pit together with slurry by a mud discharge pump P2, and takes out the solid recovered matter from a mud discharge pipe 52 by the primary filter 42 and discharges the solid recovered matter to a ground by a belt conveyor 44; and an invert construction treating system section 120 which concentrates the excess slurry other than the solid recovered matter separated by the primary filter 42 by a slurry concentrating system section 60 and constructs an invert section by adding a hardener to the concentrated slurry concentrated by the slurry concentrating system section 60. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a drilling earth and sand treatment system in a shield construction method, and more particularly, to an excavation earth and sand treatment system in a shield construction method in consideration of area saving of a starting base.

  In recent years, due to overcrowding of urban functions, shield construction methods have become the mainstream for road maintenance as infrastructure.

  In such a shield method, a muddy water treatment facility is installed at the starting base on the ground, a large yard is required, and construction in an area where it is difficult to secure a large yard such as an urban area is difficult. The excavated soil produced by the shield excavation was treated as industrial waste, and the processing cost was high.

In view of such circumstances, as shown in Patent Document 1, a property adjustment facility that adjusts the property of the mud sent to the shield chamber in real time and sends the mud in real time is installed to save the ground starting base. Reducing disposal costs as industrial waste by promoting the recycling of construction by-products (digging earth and sand) generated by excavation by increasing the area and collecting excavated soil generated by shield excavation as solid recovered material A technology that aims to achieve this has been proposed.
Japanese Patent No. 3245572

  By the way, recently, due to improvement in construction technology, there is a demand for a super-large cross-section shield and a long-distance shield. In response to such a demand, even when the technique shown in Patent Document 1 is used, a vast start There are still problems to be solved, such as securing the base yard, the amount of excess mud other than the solid recovered, the processing cost, and the processing time.

  Also, the invert placing method is currently planned in a costly manner with a construction period in which the casting material is lowered from the ground and transported in the mine by a mixer truck.

  An object of the present invention is to provide an excavation earth and sand treatment system in a shield method that realizes shortening of construction period, cost reduction, environmental conservation, and area saving of a starting base even in the construction of a super large cross-section shield, a long distance shield, and the like. .

  (1) In order to achieve the above object, the excavation soil treatment system in the shield method of the present invention supplies mud water into the shield chamber by a mud pipe and excavates a ground in the excavation path by a cutter head to excavate the soil. And excavating earth and sand processing system in shield method to take out muddy water through a sludge pipe, and excavating and excavating the natural ground in the solid state with the cutter head, and collecting the excavated solid material together with muddy water in a mine with a mud pump. A solid recovery system unit for excavated soil that transports to a primary filter and takes out the solid recovery product from the mud pipe by the primary filter and transports the solid recovery product to the ground by a belt conveyor, and is separated by the primary filter. Concentrate excess mud other than the collected solids in the mud concentration system and concentrate in the mud concentration system And having a invert construction processing system unit for applying a invert portion by adding a curing material to concentrate the mud was.

  According to the present invention, the solid recovered material cut and excavated by the solid recovery system unit is extracted with the primary filter in the mine as solid soil, conveyed to the ground by the belt conveyor, and the remaining mud is the muddy water concentration system unit. Then, it can be concentrated in the invert construction processing system part and added with a hardener and used for invert construction.

  Therefore, since the solid recovery does not require modification, the ground facilities are only loading facilities such as pits and backhoes for the remaining soil stock, and the primary processing facilities and the secondary processing facilities are not required.

Further, the remaining muddy water is used for invert construction, so that no muddy water treatment facility is required.
Therefore, the place and time required for muddy water treatment are unnecessary, and generation of industrial waste can be suppressed as much as possible.

  As a result, it is possible to shorten the construction period, reduce costs, preserve the environment, and reduce the area of the starting base even when constructing a super-large shield, a long distance shield, and the like.

  (2) In the present invention, in (1), surplus muddy water other than the solid recovery separated by the primary filter is once sent to a regulating tank disposed in the pit, and the under mud in the regulating tank is muddy water. The over mud water supplied to the concentration system unit can be supplied from there through the mud pipe and into the shield chamber and used as mud water.

  By setting it as such a structure, since the under mud in a control tank is used for invert construction, and an over mud is used for mud feeding, generation | occurrence | production of the excess water which becomes unnecessary can be suppressed as much as possible, and effective utilization can be aimed at.

  (3) In the present invention, in (2), the surplus mud produced after being concentrated in the mud concentrating system section is sent to the adjusting tank disposed in the pit, and from there through the mud pipe, the shield chamber It can be supplied to the inside and used as muddy water.

  By having such a configuration, surplus water generated after being concentrated in the muddy water concentrating system is sent to the adjustment tank disposed in the pit and used as muddy water. Generation can be suppressed as much as possible and effective use can be achieved.

  (4) In the present invention, in any one of (1) to (3), in the invert construction processing system unit, the hardened material is added to the concentrated slurry in which the specific gravity of the concentrated mud water is controlled to a predetermined value in the mud concentration system unit. It is possible to add and invert by pumping.

  By adopting such a configuration, the specific gravity of the concentrated mud water is controlled to a predetermined value, and the invert operation is performed by pumping, so that the invert operation can be performed in a good quality state and a mixer truck is unnecessary. Thus, it is possible to shorten the construction period and cost of the invert construction.

  (5) In the present invention, in any one of (1) to (4), the mud supplied to the shield chamber by the mud pipe is disposed in the mine, and the viscosity of the mud is measured by a clay sensor. It can measure continuously and can be controlled to an appropriate property by the real-time face stability control system part which adds a thickener suitably with a thickener addition apparatus.

  By adopting such a configuration, the real-time face stability control system unit can be configured compactly without using large-scale muddy water adjustment equipment.

  (6) In the present invention, in any one of (1) to (5), the muddy water concentration system unit has a concentration decanter and a concentration press. When it becomes unsuitable for invert construction, after solidifying with the concentration press, it can be carried out on the ground by the belt conveyor.

  By adopting such a configuration, it is possible to solidify and carry out unsuitable properties of muddy water using a belt conveyor for carrying out the solid recovery product without using a mud pipe, a mud pump, or the like.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.
1-5 is a figure which shows the state which used the excavation earth and sand processing system in the shield construction method concerning one embodiment of this invention for the muddy water type shield construction method.

  FIG. 1 is an overall schematic diagram of the excavated sediment treatment system in the muddy water shield method according to the present embodiment.

  In this muddy water type shield construction method, muddy water is supplied to the shield chamber 210 inside the shield machine 2 by the mud pipe 50 and the cutter head 22 of the shield machine 2 is rotated while rotating the cutter head 22 while stabilizing the face 200. Tunnels are constructed by excavating mountains.

  The shield machine 2 sequentially adds the segments 26 along with the excavation, and rotates the cutter head 22 while counteracting the face pressure by the muddy water pressure supplied to the shield chamber 210 while taking reaction force to the segments 26 with a shield jack. Let me excavate the natural ground.

  The muddy water supplied to the shield chamber 210 inside the shield machine 2 is sent by the mud pump P0 through the mud pipe 50, and the muddy water used to stabilize the face 200 is contained in the shield chamber 210. It is agitated and mixed with the excavated earth and sand, and is taken out by the mud pump P2 through the mud pipe 52.

  The mud pipe 50 is connected to an adjustment tank 10 disposed on a subsequent carriage (not shown) connected to the rear of the shield machine 2, and the excess mud water in the adjustment tank 10 is sent to the shield chamber 210. It is like that.

  In addition, a fresh water tank 12 is installed in the ground facility, and fresh water is appropriately supplied from the fresh water tank 12 to a water tank 16 disposed in a subsequent carriage in the mine via a water pipe 14. Fresh water is supplied from 16 to the adjustment tank 10 as appropriate.

  This prevents a shortage of muddy water in the adjustment tank 10.

  Further, this mud feed system is provided with a real-time face stability management system unit 30, and the waste mud system is followed by a solid recovery system unit 40, a muddy water concentration system unit 60, and an invert construction processing system unit 120. It is arranged on the carriage.

  The real-time face stability control system unit 30 is arranged in the middle of the mud pipe 50 from the adjustment tank 10 to the shield chamber 210, and adjusts the properties necessary for the mud water.

  Specifically, although not shown, a static mixer for mixing and stirring the thickening material tank for storing the thickening material and the thickening material tank provided in the mud feeding pipe 50 and the mud water supplied from the thickening material tank. And a viscometer for measuring the muddy water after mixing and stirring.

  Then, a predetermined thickener is added from the thickener tank as needed while detecting the viscosity and properties of the wastewater, and the viscosity of the mud sent and mixed by a static mixer is measured by a viscometer. , And supplied to the shield chamber 210.

  The measurement result by the viscometer is sent to the control device, and the control device adjusts the addition of the thickener based on the measurement result.

  On the other hand, the solid recovery system unit 40 in the sludge system cuts and excavates the natural ground in the solid state with the cutter head 22, and the solid recovered material that has been cut and excavated is disposed on the subsequent carriage in the mine together with the mud water by the mud pump P2. The collected solid product is taken out from the mud pipe 52 by the primary filter 42 after being transported to the filter 42, and the solid collected product is carried out to the ground by an extended belt conveyor 44 which is a transport system unit.

  In this case, as shown in FIG. 2, the cutter head 22 of the shield machine 2 has a leading bit 70 to 80 that forms a streak leading excavation groove at a predetermined interval on the face 200 and a space between the preceding excavation groove. Subsequent bits 90 and 91 for excavating the excavated portion of the natural ground in a solid state are disposed.

  As the leading bits 70 to 80, it is preferable that the leading bits 70 to 75 that can advance and retreat in the digging direction and the leading bits 80 fixed to the cutter head 22 are appropriately arranged on the cutter head 22.

  Here, the solid state means a state in which the skeletal structure of the soil particles is maintained in the same manner as the natural ground state during excavation, and the excavated excavation refers to the uncovered convex portion of the natural ground between the preceding excavation grooves. In other words, it means cutting to a substantially constant size or less in a solid state.

  The leading bits 70 to 80 and the trailing bits 90 and 91 are arranged on the cutter head 22 in consideration of a phase difference caused by the rotation of the cutter head 22 so as to cut and excavate a natural ground with a substantially constant size. Has been.

  For example, the two-dot chain line shown in FIG. 2 is the locus of each preceding bit 70-80, and the preceding bits 70-80 are arranged on the cutter head 22 so that each locus of each preceding bit 70-80 is substantially equally spaced. The succeeding bits 90 and 91 are arranged on the cutter head 22 so as to excavate the natural ground that has not been excavated by the preceding bits 70 to 80 between the trajectories.

  Specifically, a natural ground that has not been excavated by the preceding bits 74 and 75 is excavated by the succeeding bits 90-1 and 90-2.

Similarly, the subsequent bits 90-3 and 4 correspond to the preceding bits 70 and 71, and the succeeding bits 90-5 and 6 correspond to the preceding bits 72 and 73, respectively.
The same applies to the correspondence between the other preceding bits 70 to 80 and the succeeding bits 90 and 91.

  FIG. 3 is a schematic diagram three-dimensionally showing the excavation state of the natural ground due to the interaction between the preceding bits 74 and 75 and the succeeding bit 90-1, and FIGS. And the excavation state of the natural ground by the succeeding bit 90-1 is shown.

  As shown in FIG. 3A, two streak grooves are formed in the natural ground 300 by the leading bits 74 and 75. Next, as shown in FIG. 3B, a part of the natural ground 300 between the preceding excavation grooves left in a strip shape is cut and excavated by the trailing bit 90-1.

Then, as shown in FIG. 3 (C), the excavation object 110 having a substantially cubic shape is cut out from the natural ground 300.
As shown in FIG. 4, the mud pump P2 includes a plurality of blade bodies 100-1 and 2 that rotate inside.

  In this case, when the interval between the preceding excavation grooves is set to be approximately the same as the pure interval L between the blade bodies 100 shown in FIG. 4, for example, when the portion is excavated by the rotation of the cutter head 22, Can be made substantially equal to the size of L.

  As a result, the size of the excavated material 110 can be set to the maximum size that is not boring with transport equipment such as the mud pump 102, and debris crushing equipment such as a crusher is not necessary, and mud can be drained as large as possible. .

  The primary filter 42 filters the excavated material 110 and mud water as solid recovered material sent by the mud pipe 52, takes out only the excavated material 110, supplies it to the belt conveyor 44, and includes surplus containing other excavated earth and sand. The muddy water is sent to the adjustment tank 10 by the pump P.

  In this case, 80 to 85% of the excavated earth and sand is taken as a solid recovery, and the remaining 20 to 15% is used for invert construction in the invert construction processing system unit 120.

  The solid recovered material supplied on the belt conveyor 44 is conveyed in the horizontal direction and the vertical direction by the belt conveyor 44, and is transported to the earth and sand pit 46 of the ground facility, and is transported to the outside by a backhoe and recycled as general construction residual soil. Will be.

  The surplus muddy water sent to the adjustment tank 10 is subjected to a precipitation process in the adjustment tank 10, and the under muddy water is sent to the muddy water concentration system section 60 by the pump P.

  The muddy water concentration system unit 60 includes a concentration decanter 62 and a concentration press (filter press) 64, each of which is connected to the adjustment tank 10 and concentrated by the concentration decanter 62 and the concentration press (filter press) 64. 20 to 15% of excavated soil is supplied to the invert construction processing system unit 120.

  Further, surplus water generated in the concentration decanter 62 and the concentration press (filter press) 64 is supplied to the adjustment tank 10, further subjected to precipitation treatment, and supplied to the shield chamber 22 as muddy water. .

  In this muddy water concentration system unit 60, although not shown, the flow rate and density of over mud water on the first water flow meter and density meter for measuring the flow rate and density of the supply side muddy water and the full water regulator provided on the discharge side. The flow rate of the under slurry is calculated based on the measurement value of the second flow meter and the density system, and the density of the under slurry is calculated by the calculation unit for calculating the density of the under slurry. The specific gravity is managed to be maintained at 1.5, for example.

  As shown in FIG. 5, the invert construction processing system unit 120 stores the excavated sediment that has been maintained and managed to have a specific gravity of 1.5, for example, concentrated slurry, supplied from the concentration decanter 62 and the concentration press (filter press) 64. It is stored in the tank 122, stirred there, and supplied to the slurry plant 124 by the pump P 5, where the fluidizing material (curing material) is added and stirred from the fluidizing material silo 126, and inverted by the squeeze pump 128. Supply to the construction department.

  Therefore, invert construction is possible without using a mixer truck, and the construction cost and cost can be reduced.

  In this way, the solid recovered material cut and excavated by the solid recovery system unit 40 is extracted as solid soil by the primary filter 42 in the mine, transported to the ground by the belt conveyor 44, and the remaining mud is a muddy water concentration system. It can concentrate in the part 60, can add a hardening | curing material in the invert construction processing system part 120, and can use it for invert construction.

  Accordingly, since the solid recovered material does not require modification, the ground facilities are only the sediment pits 46 for the remaining soil stock and the loading facilities such as the backhoe, and the primary treatment facility and the secondary treatment facility are unnecessary.

Further, the remaining muddy water is used for invert construction, so that no muddy water treatment facility is required.
Therefore, the place and time required for muddy water treatment are unnecessary, and generation of industrial waste can be suppressed as much as possible.

  As a result, it is possible to shorten the construction period, reduce costs, preserve the environment, and reduce the area of the starting base even when constructing a super-large shield, a long distance shield, and the like.

  In addition, the mud concentrating system section 60 is solidified by the concentrating press 64 when the properties of the mud after the concentration become unsuitable for invert construction due to the change in the properties of the natural ground due to alternate layers due to construction of a large section shield or the like. By using the belt conveyor, the muddy water having an inappropriate property can be discharged by the belt conveyor for carrying out the solid collection without using a sludge officer or a sludge pump. It can be solidified and carried out.

  The present invention is not limited to the above-described embodiment, and can be modified into various forms within the scope of the gist of the present invention.

  For example, in the above-described embodiment, the muddy water type shield method has been described. However, the present invention is not limited to this example, and the muddy water type shield method can also be applied.

BRIEF DESCRIPTION OF THE DRAWINGS It is the whole schematic diagram of the processing system of the excavation soil in the muddy water type | mold shield method which concerns on an example of embodiment of this invention. It is a front view of the cutter head of the shield machine shown in FIG. It is the schematic which shows the excavation state of the natural ground by the advance and retreat of a preceding bit and a succeeding bit in three dimensions, (A)-(C) is a figure which shows the excavation state of the natural mountain by a preceding bit and a succeeding bit. It is sectional drawing of the mud pump shown in FIG. It is a schematic diagram of the invert construction processing system part of FIG.

Explanation of symbols

2 Shield machine 10 Adjusting tank 22 Cutter head 30 Real-time face stability control system part 40 Solid recovery system part 42 Primary filter 44 Belt conveyor 46 Sediment pit 50 Mud pipe 52 Mud pipe 60 Mud concentration system part 62 Concentration decanter 64 Concentration press 120 Invert construction processing system part 210 Shield chamber

Claims (6)

An excavation sediment treatment system in a shield construction method in which mud is supplied into a shield chamber by a mud pipe and excavated soil and mud are taken out by a mud pipe by excavating a ground in the excavation path by a cutter head.
The ground is cut and excavated in a solid state by the cutter head, and the solid recovered material that has been excavated and excavated is transported to a primary filter in a mine along with mud by a mud pump, and the solid recovered material is discharged to the primary mud by the primary filter. A solid recovery system part of excavated soil that is taken out from the pipe and carried out on the ground by a belt conveyor;
An invert construction processing system part for concentrating surplus mud other than the solid recovered separated by the primary filter in a mud concentrating system part and adding a curing material to the concentrated mud concentrated in the mud concentrating system part to construct an invert part The excavation sediment processing system in the shield method characterized by having. In claim 1,
Surplus muddy water other than the solid recovered separated by the primary filter is once sent to the adjustment tank disposed in the pit, the under muddy water in the adjustment tank is supplied to the muddy water concentration system unit, The excavated sediment treatment system in the shield method is supplied to the shield chamber through the mud pipe and used as mud water. In claim 2,
The surplus mud generated after being concentrated in the mud concentrating system is sent to the adjusting tank disposed in a pit, and then supplied to the shield chamber through the mud pipe and used as mud water. Excavation sediment treatment system in the shield method. In any one of Claims 1-3,
In the invert construction processing system section, excavation in the shield construction method is characterized in that a hardener is added to the concentrated slurry in which the specific gravity of the concentrated mud water is controlled to a predetermined value in the mud concentration system section and the invert construction is performed by pumping. Sediment treatment system. In any one of Claims 1-4,
The muddy water supplied into the shield chamber by the mud pipe is arranged in the mine, continuously measures the viscosity of the tank mud by a clay sensor, and adds a thickener appropriately by a thickener addition device. The excavated sediment treatment system in the shield method, which is controlled to an appropriate property by the face stability management system section. In any one of Claims 1-5,
The muddy water concentration system unit has a concentration decanter and a concentration press.If the properties of the muddy water after concentration become unsuitable for invert construction due to changes in the properties of the natural ground, after solidifying by the concentration press, The excavation earth and sand processing system in the shield method characterized by carrying out to the ground with the said belt conveyor.

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