Open shield machine and open shield construction method using the same

Abstract

To provide an open shield machine and an open shield construction method using the same, which are safe and efficient without the use of an excavator, for laying a box conduit in a narrow space close to houses, repairing an existing fence conduit, etc.SOLUTION: In an open shield machine 1, a body consisting of left and right side wall panels 1a and a bottom panel 1b is divided in the front / rear direction into a front machine 17 and a tail machine 18, a front end of the tail machine 18 is fitted into a rear end of the front machine 17 to make it bendable, and propulsion jacks 3 are arranged on the left and right sides in a front portion inside the tail machine 18 so as to face backward and are arranged in multiple vertical levels. A frame 27 provided with beams 30 in the front / rear direction is formed so as to extend upward from an upper end of the tail machine 18, a traveling beam on which a chain block 28 can travel is horizontally installed across the front / rear beams 30, and an excavation clamshell bucket 31 is suspended from the chain block 28.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an open shield machine and an open shield method using the same.

Background Art

[0002] The open shield method is a rational method that takes advantage of the merits of the excavation method (open cut method) and the shield method, and its schematic is shown in FIGS. 8 to 17.

[0003] In the figure, 1 is an open shield machine, which is a shield machine with openings in the front, rear, and upper surfaces composed of left and right side wall plates 1a and a bottom plate 1b connected to these side wall plates 1a as shown in FIGS. 11 to 13.

[0004] The open shield machine 1 forms the tips of the side wall plates 1a and the bottom plate 1b as cutting edges 2, and propulsion jacks 3 are arranged vertically side by side with the rear ends facing backward near the center or the rear end of the side wall plates 1a.

[0005] Further, the open shield machine 1 divides the machine body into a front machine 17 and a tail machine 18 in the front-rear direction, and the front end of the tail machine 18 is fitted into the rear end of the front machine 17 to form a middle bending part 47 at the mutual fitting part so as to be bendable. A middle bending jack 20 is arranged at this middle bending part 47.

[0006] The front machine 17 mainly serves as an excavation part, and the tail machine 18 is provided with propulsion jacks 3 and becomes a tail part 19 as a lifting and lowering installation part for the concrete casing 4 and the U-shaped open channel 42.

[0007] In the figure, 16 is a slide jack of the slide earth retaining plate provided at the front end of the front machine 17, and 23 is a pressing angle (press bar) using an H-shaped steel material or the like. In the figure, 48 is a rear earth retaining plate when the concrete casing 4 comes out of the tail machine 18 as the open shield machine 1 advances, and the upper part of the concrete casing 4 is backfilled inside this.

[0008] The general process of the open shield method is as follows. First, as shown in Fig. 14, the open shield machine 1 is assembled at a predetermined position in the launching shaft 8. After assembly, the propulsion jack 3 of the open shield machine 1 is extended to take reaction force against the reaction wall 9 in the launching shaft, and the open shield machine 1 is advanced. The first concrete casing 4 for forming the underground structure is hoisted and lowered from above and set behind the retracted propulsion jack 3 in the tail part 19 of the open shield machine 1.

[0009] The concrete casings 4 sequentially laid in the launching shaft 8 are temporarily laid as reaction force transmission materials until the open shield machine 1 advances forward, exits the launching shaft 8, and advances to a predetermined distance until the propulsion force of the open shield machine is no longer transmitted to the reaction wall 9 in the launching shaft 8, and they are removed when the propulsion reaction force is no longer transmitted to the reaction wall 9.

[0010] The launching shaft 8 is composed of a retaining wall 49. To start the open shield machine 1, a part of the retaining wall in front is cut off. Optionally, ground improvement 11 may be performed on the front part of the launching shaft 8 by chemical solution injection or the like.

[0011] Next, after cutting off a part of the retaining wall in front of the launching shaft 8, as shown in Fig. 15, the excavator 6 such as a shovel excavates the earth and sand from the upper surface of the ground in front of the open shield machine 1 and discharges the soil.

[0012] Simultaneously with or after this soil discharging process, the propulsion jack 3 is extended to advance the open shield machine 1. In this forward movement process, in front of the concrete casing 4, a press bar (press angle) 23 (see Figs. 8 and 11) made of a frame using box steel or section steel is arranged.

[0013] After the open shield machine 1 advances forward by the length of one casing, the second concrete casing 4 is hoisted and lowered and set in the tail part 19 of the open shield machine 1 by the heavy lifting and lowering equipment 24 in front of the first concrete casing 4 as shown in Fig. 16.

[0014] Subsequently, the following similar excavation and soil discharge processes, advancement process, and setting process of the concrete casing 4 are appropriately repeated, and the concrete casings 4 are sequentially left underground in a vertical row as the open shield machine 1 advances. As shown in Fig. 16, backfilling is performed on the upper surface of the concrete casing 4, and paving is performed on its surface.

[0015] In addition, in the setting process of the concrete casing 4, after the concrete casing 4 is set in the tail machine, the backfill injection material 25 is used as the primary injection, and the backfill injection material 25 is filled as the secondary injection into the voids generated underground along with the excavation and soil discharge processes and the advancement process of the open shield machine 1.

[0016] As described above, as shown in Fig. 17, when the open shield machine 1 reaches the arrival pit 13, it is removed to complete the construction.

[0017] Although not shown in the figure, the concrete casing 4 is made of reinforced concrete and is a rectangular integral structure composed of a left side plate, a right side plate, a top plate, and a bottom plate, and the front and rear surfaces are open as openings.

[0018] In addition, grout holes are provided in the vicinity of the central parts of the left and right side plates and the bottom plate in advance. After the concrete casing 4 is installed in the tail part 19, the backfill injection material 25 is injected and filled into the tail voids generated in the ground during the excavation of the open shield machine 1 as the primary injection and the secondary injection, respectively, through the grout holes.

[0019] Figs. 8 to 12 show the construction conditions in the open shield method for renovation work of existing fence channels, rivers, etc., where the hoisting and lifting equipment 24 for suspending and setting the U-shaped open channel 42 cannot enter or turn in a narrow place with houses close on both sides, and the excavator 6 cannot be arranged in front of the open shield machine 1.

[0020] As shown in the figure, a structure 27 is installed at the upper end of the tail machine 18 of the open shield machine, and the excavator 6 is mounted on the upper part of the front machine 17, enabling construction even under the above conditions. This is a method often used under such construction conditions in the open shield method and has a lot of construction achievements.

[0021] In addition, the patent documents used under construction conditions such as the above-mentioned narrow locations are shown below.

Patent Document 1

[0022] Patent Document 1 is a shield machine equipped with a structure for suspending a casing, which is composed of a support column and a beam member at the upper end of the casing installation part (tail part) of an open shield machine, and a hoisting machine such as a chain block is provided so as to be movable back and forth and left and right.

[0023] When Patent Document 1 cannot be constructed in a narrow place where there is only enough space for a truck crane (hoisting machine) for suspending a concrete casing to enter, or a building where the truck crane cannot turn is close, in order to address this, it is a shield machine equipped with a gantry crane for suspending the casing, with a hoisting machine such as a chain block installed at the upper end of the tail machine of the open shield machine.

[0024] In addition, by extending the beam member of the above structure backward to project a casing lifting part behind the open shield machine, it is easier to lift the casing transported by a bogie or the like from behind the open shield machine.

[0025] Furthermore, by projecting the beam member of the casing lifting part forward as well, after the earth and sand excavated from the face ground in front of the open shield machine by an excavator are received in a bucket or the like, the bucket can be lifted by the structure, moved directly backward, and transferred to a dump truck or the like.

Summary of the Invention

Problems to be Solved by the Invention

[0026] In Patent Document 1, although the casing can be installed smoothly by the structure, since the beam member of the casing lifting part is simply projected forward, it is necessary to perform the work of loading and transporting the earth and sand excavated by the excavator into a bucket or the like, resulting in an increase in the number of work types and working hours.

[0027] In addition, the deeper the depth at which the casing is buried, the larger the excavator has to be, which may hinder the turning of the excavator in a narrow space. Furthermore, depending on the excavation depth, the arm of the excavator may not reach the predetermined excavation depth and excavation may not be possible.

[0028] Similarly, in the cases shown in FIGS. 8 to 12, the deeper the depth at which the casing is buried, the larger the excavator has to be, which may hinder the turning of the excavator due to adjacent buildings or the like in a narrow space, or the arm of the excavator may not reach and excavation may not be possible.

[0029] Also, during excavation, the excavator turns 180° and extends the arm of the excavator backward so as not to contact the struts of the casing hanging equipment in the structure, and loads the excavated soil into the excavated soil carrying bucket, which requires excavation and loading time and deteriorates the work efficiency.

[0030] Furthermore, since the excavator is mounted on the front machine of the open shield machine, depending on the proximity to houses and the degree of narrowness, it is difficult for those other than the excavator operator to see the situation ahead, so other workers cannot confirm the situation of the face ground and the like, and there are cases where the actual measurement and confirmation of the position and height of the front part of the open shield machine by surveying cannot be performed.

[0031] An object of the present invention is to solve the above disadvantages, and to provide an open shield machine with good work efficiency that can perform excavation without causing obstacles such as contact with surrounding buildings and casing hanging equipment even in a narrow space where buildings are close, and further can perform excavation even at an excavation depth where the arm of the excavator cannot reach, and an open shield method using the same.

Means for Solving the Problems

[0032] To achieve the above object, the present invention according to claim 1 divides the machine body composed of left and right side wall plates and a bottom plate into a front machine and a tail machine in the front-rear direction, inserts the front end of the tail machine into the rear end of the front machine to make it bendable, and has a propulsion jack arranged on the front side inside the tail machine and moved left and right and arranged in a plurality of upper and lower stages. The open shield machine is characterized in that a structure provided with beam members in the front-rear direction is formed upward from the upper end of the tail machine, a traveling beam member on which equipment for lifting and lowering weights is installed so as to be movable is horizontally mounted on the beam members in the front-rear direction, and an excavating clam shell bucket is suspended from the equipment for lifting and lowering weights.

[0033] According to the invention of claim 1, it is possible to excavate the face soil in front of the cutting edge without using a shovel-type excavator crane with an excavating clam shell bucket suspended by equipment for lifting and lowering weights attached to the structure installed in the tail machine of the open shield machine.

[0034] In addition, since the clam shell bucket is suspended by equipment for lifting and lowering weights installed on the structure, if the length of the suspension wire of the chain block is adjusted in advance, the clam shell bucket can be suspended at a depth where the arm of the excavator crane cannot reach, so that excavation can be sufficiently performed.

[0035] The present invention according to claim 2 is characterized in that a slide earth retaining plate is provided at the cutting edge of the front machine, and the front end of the beam member in the front-rear direction projects forward beyond the tip of the slide earth retaining plate that is maximally extended from the front end of the cutting edge of the front machine.

[0036] According to the invention of claim 2, since the excavating clam shell bucket can move forward beyond the tip of the slide earth retaining plate that is maximally extended from the front end of the cutting edge of the front machine, it is possible to reliably excavate the face soil in front of the cutting edge.

[0037] According to the present invention described in claim 3, the clamshell bucket for excavation is hydraulically operated, the propulsion jack and the clamshell bucket are each connected to an individual hydraulic pump, and the propulsion of the open shield machine by the extension of the hydraulic jack and the opening and closing of the clamshell bucket can be operated simultaneously or individually.

[0038] According to the present invention of claim 3, since the clamshell bucket for excavation is hydraulically operated, it can surely excavate and grip the earth and sand of the face ground to be excavated and move it to the spoil bucket disposed behind the shield machine, so that smooth excavation and spoil removal work can be performed.

[0039] In addition, since the propulsion jack and the hydraulically operated clamshell bucket are each connected to a separate hydraulic pump, simultaneous work can be performed between the propulsion of the open shield machine and the excavation of the face ground in front of the cutting edge of the shield machine, and the excavation work of the open shield machine can be performed smoothly.

[0040] Furthermore, the propulsion of the open shield machine by the extension of the hydraulic jack and the opening and closing of the clamshell bucket can be operated simultaneously or individually. Therefore, even when the face ground is likely to loosen depending on the state such as the soil properties of the face ground in front of the cutting edge of the open shield machine and the height of the groundwater level, while checking the situation of the face ground at any time, the face ground can be consolidated and stabilized only by temporarily advancing the open shield machine, or the excavation work by the hydraulic clamshell bucket can be prioritized. Therefore, it is possible to respond flexibly to excavation while always checking the situation of the face ground, so that reliable excavation work can be performed while ensuring the stability of the face ground.

[0041] According to the present invention described in claim 4, the clamshell bucket for excavation is hydraulically operated, the clamshell bucket is connected to the hydraulic pump that operates the propulsion jack installed in the open shield machine, and the clamshell bucket can be operated by the oil distribution from the hydraulic pump.

[0042] According to the present invention described in claim 4, it operates by the hydraulic oil discharged from a hydraulic pump that operates a hydraulic jack installed in an open shield machine, and by interposing a switching valve that switches the flow of the hydraulic oil in the middle of the pipe from the clam shell bucket to the hydraulic pump, the opening and closing operation of the clam shell bucket is enabled.

[0043] Since the excavation clam shell bucket is hydraulically openable and closable, it can surely excavate and grip the earth and sand of the face ground to be excavated and move it to the spoil bucket disposed behind the shield machine. Therefore, smooth excavation and spoil removal work can be performed. Moreover, since the hydraulically openable and closable clam shell bucket is connected to the hydraulic pump for operating the propulsion jack, simplification of the equipment can be achieved without increasing the number of hydraulic pumps.

[0044] The switching valve interposed in the middle of the pipe in this way can be manually or electromagnetically operated without any problem, whether it is a hydraulic equipment specification or structure. By using the electric power for operating the hydraulic pump and the electric chain block, it is also possible to perform the opening and closing operation of the clam shell bucket by using an electromagnetic operation type switching valve and switch.

[0045] The present invention described in claim 5 is an open shield method using an open shield machine. The excavation clam shell bucket is suspended from the equipment for hoisting and lowering installed on the traveling beam member of the structure provided with beam members in the front-rear direction. The clam shell bucket is suspended toward the face ground in front of the shield machine blade edge, and after excavation and hoisting, it moves to the spoil handling equipment disposed behind and performs loading. The excavation and spoil transportation and unloading process, the propulsion process by the extension of the propulsion jack of the open shield machine, after propelling for the length of one lining segment, the removal and movement process of the clam shell bucket, and the hoisting, movement, and suspension and installation process into the tail machine of the lining or U-shaped open channel transported behind the open shield machine by the said structure are repeated to install the lining or U-shaped open channel.

[0046] According to the present invention described in claim 4, since the face soil in front of the open shield machine blade can be excavated without using an excavator, there is no contact with nearby buildings or structures due to the rotation of the excavator, etc., and excavation and muck removal work can be carried out safely and efficiently. And since an excavator is not used, there is no lease cost of the excavator or labor cost of the excavator operator, which is economical.

[0047] In the case of renovation work of existing fence channels or rivers, usually, an excavator is mounted on the front part of the open shield machine for construction. However, in the present invention, since an excavator is not mounted on the excavator and the open shield machine, the excavation situation and soil properties of the face soil in front of the open shield machine blade can be sufficiently confirmed, and it is possible to quickly respond to changes in those situations.

[0048] Also, for the management of the propulsion behavior during the advancement of the open shield machine, a surveying sighting target is installed near the tip of the machine, and surveying is performed with a front surveying instrument from the rear. However, since there is no excavator, there is no obstacle to the sighting of the surveying instrument, and surveying can be performed without problems.

[0049] Furthermore, in the renovation work of existing fence channels or rivers where houses are close, when the construction progresses to near the reach section, it is necessary to move and retreat the excavator. However, this is not necessary in the present invention.

Effects of the Invention

[0050] As described above, the open shield machine of the present invention and the open shield method using the same have good working efficiency from excavation to the laying of a casing or U-shaped open channel, and can perform construction safely and economically.

Brief Explanation of the Drawings

[0051]

Figure 1

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Figure 11

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Figure 13

Figure 14

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Figure 16

Figure 17

Embodiments for Carrying Out the Invention

[0052] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing one embodiment of the open shield method of the present invention, and FIG. 2 is a longitudinal side view during the excavation of the open shield machine, in which the same reference numerals are assigned to the same components as those in FIGS. 7 to 15 showing the conventional example.

[0053] In the figure, 1 is an open shield machine 1, which consists of a front machine 17 and a tail machine 18. The front part of the tail machine 18 is fitted to the rear part of the front machine 17, and the fitting part is a middle folding part 47, which can be bent. Both the front machine 17 and the tail machine 18 are composed of a bottom plate 1b and left and right side walls 1a, and the upper part is open.

[0054] A slide earth retaining plate 16a with a slide jack 16 installed therein is provided at the cutting edge of the front machine 17. From the front end of the cutting edge of the front machine 17, the slide earth retaining plate 16a with the slide jack 16 installed therein can extend forward, and it has the function of suppressing the loosening of the side earth when excavating the face ground in front of the cutting edge 2 while forming a slope.

[0055] Also, the propulsion jacks 3 are arranged on the middle folding part 47 side of the tail machine 18 facing backward, shifted left and right, and arranged in a plurality of upper and lower stages.

[0056] As shown in FIGS. 2 to 5, on the upper ends of both side walls of the tail machine 18, a structure 27 composed of columns and beams is erected, and as equipment for lifting and lowering heavy objects, a longitudinal beam 30 is provided as a running beam for an electric chain block 28 on the inner upper part of each of the left and right columns.

[0057] A running beam member 41 is horizontally installed on the longitudinal beam 30 so as to be able to run as a running beam for the electric chain block 28. An electric chain block 29 is installed on this running beam member 41.

[0058] Note that although the electric chain block 28 is suitable as the equipment for lifting and lowering heavy objects, alternatives such as a wire block, a lever block (registered trademark), an electric winch, etc. may also be used.

[0059] As shown in Fig. 5, the slide earth retaining plate 16a attached to the front machine 17 extends forward from the edge end of the cutting edge, and although it varies depending on the slide earth retaining plate 16a to which it is attached, it extends up to a maximum of 1.0 m or 1.5 m. The front end of the beam member 30 in the front-rear direction projects beyond the tip of the slide earth retaining plate 16b that has extended to its maximum extent.

[0060] By projecting the beam member 30 in the front-rear direction to the above-mentioned position, in the excavation of the face ground in front of the cutting edge 2, the slide earth retaining plate 16a can be extended almost to the maximum from the end of the cutting edge 2, and the excavation clam shell bucket can move to a position beyond the tip of the slide earth retaining plate 16a. Therefore, by forming a concave slope surface forward while changing the slope gradient according to the state of the ground from the tip of the slide earth retaining plate 16b that has extended to the maximum toward the front machine 17 side, excavation can be carried out so as to maintain the stability of the face ground.

[0061] Also, as shown in Fig. 3, the rear end of the beam member 30 in the front-rear direction projects to a position where the U-shaped open channel 42 carried to the rear end of the tail machine of the open shield machine 1 can be lifted in.

[0062] In this embodiment, for the excavation clam shell bucket 31, a hydraulic opening and closing type is used, and it is suspended from the electric chain block hook 29 of the electric chain block 28. Note that for the excavation clam shell bucket, other equipment may be attached, and a wire type clam shell bucket or the like may be used.

[0063] At the rear part of the front machine 17 of the open shield machine 1, a hydraulic pump 33 for propulsion of the open shield machine 1 and a hydraulic pump 33 for a hydraulic opening and closing type clam shell bucket or the like are installed respectively.

[0064] An engine generator 32 is installed at the front part of the tail machine 18 and is connected to equipment such as the electric chain block of the frame 27, the hydraulic pump 33, the bucket control switch 35, and the hydraulic operation panel.

[0065] The electric chain block 28 is operated by an electric chain block operation switch 36 via a power cable 40, and the clam shell bucket 31 is operated by a bucket control switch 35 via a bucket control valve 34.

[0066] As another embodiment, as shown in FIG. 7, the clam shell bucket 31 may be connected to a hydraulic pump 33 that operates a propulsion jack 3 installed in the open shield machine 1, and the clam shell bucket 31 may be operated by the distribution of oil from the hydraulic pump 33.

[0067] The clam shell bucket 31 is connected to the pressure pump 33 via a clam shell bucket switching valve 52.

[0068] In the figure, 53 is a clam shell bucket opening / closing switch, which is arranged between a distribution board 55 from a power generation and power supply generator 56 and the clam shell bucket switching valve 52. In the figure, 54 indicates an operation panel of the propulsion jack 3.

[0069] Next, a method for laying the box body 4 or the U-shaped open channel 42 by the open shield method using the above open shield machine 1 will be described.

[0070] First, as shown in FIGS. 2, 4, and 5, the excavation and earth and sand removal method of the open shield machine 1 is to extend the propulsion jack 3 equipped on the open shield machine 1 while taking the propulsion reaction force from the already laid U-shaped open channel 42 immediately behind, and propel the open shield machine 1 forward. Then, simultaneously with the excavation or depending on the excavation shape of the face ground and the soil properties, the propulsion of the open shield machine is stopped for excavation.

[0071] For excavation, the excavation clam shell bucket 31 suspended from the electric chain block hook 29 of the electric chain block 28 installed on the frame 27 is moved above a predetermined position of the face ground in front of the blade edge 2 of the front machine 17 of the open shield machine 1 while operating the electric chain block operation switch 36.

[0072] Then, operate the chain block operation switch to lower the suspended bucket 31 to the face of the mountain, open the clam shell bucket 31, and pierce and penetrate into the earth and sand on the face of the mountain by the self-weight of the bucket 31 to perform excavation. Then, close the bucket 31 to grip the earth and sand.

[0073] After that, move the bucket 31 to the position of the muck removal bucket 44 transported to the rear of the tail machine 18 of the open shield machine 1, lower the bucket 31, and load the earth and sand into the muck removal bucket 44 placed on the transport trolley 46.

[0074] The transport equipment of the muck removal bucket 44 is composed of a transport trolley 46 and a battery locomotive, and travels on the running rail 45 laid on the bottom plate of the laid U-shaped open channel 42 and moves to the launch shaft 8.

[0075] Then, lift it to the ground by the hoisting and lifting equipment 24 arranged on the launch shaft 8, and carry it out of the site by the muck removal dump truck 7.

[0076] The laying of the concrete box 4 or the U-shaped open channel 42 is, as shown in FIGS. 3 and 6, after excavating for a length of one U-shaped open channel (or one box length) by the open shield machine 1, fix and temporarily place it on the front machine 17 of the open shield machine 1, or as shown in FIG. 6, transport the excavation clam shell bucket 31 to the launch shaft 8 or the temporary placement space by the transport equipment composed of the transport trolley 46 and the battery locomotive, and temporarily place it once.

[0077] After that, lower the U-shaped open channel 42 to below the shaft by the hoisting and lifting equipment 24 arranged on the launch shaft 8, and transport it to the rear of the tail machine 18 of the open shield machine 1 by the transport equipment composed of the transport trolley 46 and the battery locomotive.

[0078] Then, lift the U-shaped open channel 42 by the electric chain block 28 attached to the framework 27, and suspend and install it in the tail part 19 in the tail machine 18.

[0079] While repeating the method described above, the open shield machine 1 is advanced, and the U-shaped open channel 42 or the concrete casing 4 is laid.

Explanation of Signs

[0080] 1…Open shield machine 1a…Side wall plate 1b…Bottom plate 2…Cutting edge 3…Propulsion jack (shield jack) 4…Concrete casing 5…Backfill 6…Excavator 7…Dump truck for transporting excavated soil 8…Launch shaft 9…Reaction wall 11…Ground improvement 13…Arrival pit 15…Dump truck for backfill 16…Slide jack 16a…Slide earth retaining plate 16b…Slide earth retaining plate at maximum extension 17…Front machine 18…Tail machine 19…Tail part 20…Mid-bending jack 21…Backfill injection plant 22…Grout pipe 23…Press bar (press corner) 24…Equipment for hoisting and lowering weights (raft lane crane) 25…Backfill injection material 26…Cover board 27…Framework 28…Electric chain block 29…Hook of electric chain block 30…Beam material in the front-rear direction 31…Clamshell bucket (hydraulically operated) 32…Generator for starting 33…Hydraulic pump 34…Bucket control valve 35…Bucket control switch 36…Operation switch of electric chain block 38…Signal line 39…Hydraulic hose 40…Power cable 41…Traveling beam 42…U-shaped open channel (made of concrete) 43…Battery locomotive 44…Excavated soil removal bucket 45…Traveling rail 46…Transport trolley 47…Mid-bending part 48…Rear earth retaining plate 49… Earth retaining wall 50… Existing grid channel 51… Movable motor 52… Clamshell bucket changeover valve 53… Clamshell bucket opening / closing switch 54… Control panel 55… Distribution board 56… Engine generator

Claims

1. An open shield machine comprising a machine body composed of left and right side wall plates and a bottom plate, which is divided into a front machine and a tail machine in the front-rear direction, the front end of the tail machine is inserted into the rear end of the front machine to be bendable, and propulsion jacks are arranged on the front side inside the tail machine, shifted left and right, and arranged in a plurality of upper and lower stages, A structure provided with beam members in the front-rear direction is formed upward from the upper end of the tail machine, a traveling beam member on which a hoisting and lifting facility is installed to be movable is horizontally mounted on the beam members in the front-rear direction, and an excavating clam shell bucket is suspended from the hoisting and lifting facility, characterized in that It is an open shield machine.

2. The open shield machine according to claim 1, wherein a slide earth retaining plate is provided at the blade edge of the front machine, and the front end of the beam member in the front-rear direction projects forward beyond the tip of the slide earth retaining plate that extends maximally from the front end of the blade edge of the front machine.

3. The excavating clam shell bucket is hydraulically openable and closable, the propulsion jacks installed on the open shield machine and the clam shell bucket are respectively connected to individual hydraulic pumps, and the propulsion of the open shield machine by the extension of the hydraulic jack and the opening and closing of the clam shell bucket can be operated simultaneously or individually. The open shield machine according to claim 1 or claim 2.

4. The excavating clam shell bucket is hydraulically openable and closable, the clam shell bucket is connected to the hydraulic pump that operates the propulsion jacks installed on the open shield machine, and the clam shell bucket can be operated by the oil distribution from the hydraulic pump. The open shield machine according to claim 1 or claim 2.

5. A digging, earth and sand transporting and discharging process in which an excavating clam shell bucket is suspended from a hoisting and lifting facility installed on a traveling beam member of a structure provided with beam members in the front-rear direction, the clam shell bucket is suspended toward the face ground mountain in front of the blade edge of the open shield machine, after excavation and hoisting, it is moved and loaded to the earth and sand discharging facility arranged at the rear, A propulsion process by the extension of the propulsion jacks of the open shield machine, After advancing by the length of one casing, the process of removing and moving the clam shell bucket, and The process of lifting, moving, and suspending and installing into the tail machine the casing or U-shaped open channel carried behind the open shield machine by the said structure, and An open shield method using an open shield machine, characterized by installing the casing or U-shaped open channel while repeating the above.

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