JP2009114641A - Method for repairing existing channel by open shield method, and open shield machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for repairing an existing channel by an open shield method, which dispenses with the separate securement of a drainage route even during repair work for the existing channel by supplying water in the existing channel to the rear through an open shield machine, and which can restrain surroundings from being affected by the scouring, loosening, etc. of surrounding natural ground, associated with the repair of the existing channel, even if the outside width of the existing channel is greater than the inside width of the front section of the shield machine; and to provide the open shield machine. <P>SOLUTION: This method is practiced by repeating: a step of arranging a closing wall 13 in the width direction of the channel, equipped with an externally-opened double hinged door 14, ahead of a front section 1d of the open shield machine 1, and of performing excavation and earth removal in a space surrounded by the closing wall 13 and the inside of the front section 1d; a step of opening the door 14 of the closing wall 13 depending on the removal of one section of a side wall 42 of the existing channel 40; a step of removing one section of a bottom floor panel 41 of the existing channel 40 in that state; and a step of advancing the open shield machine 1 by removing the closing wall 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for repairing an existing waterway by an open shield construction method for constructing underground structures such as water and sewage systems, common ditches, telegraphs and telephones, and underground structures for passenger cars, etc. It relates to a shield machine.

  The open shield method is widely used as a method for constructing underground structures such as water and sewage systems, common ditches, telegraphs and telephones, and other underground structures. The open shield method is a highly rational method that utilizes the advantages of the open cut method (open cut method) and the shield method.

  As shown in FIG. 11, the outline of the open shield machine 1 used in this open shield construction method is a U-shaped cross section in which the front, rear and top surfaces comprising left and right side wall plates 1a and bottom plates 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 propulsion jacks 2 are arranged in the vertical direction toward the rear near the center or near the rear end of the side wall plate 1a. In the figure, 3 indicates a partition wall.

  The open shield method to be constructed using such an open shield machine 1 is not shown in the figure, but this open shield machine 1 is installed in the start pit, and the propulsion jack 2 of the open shield machine 1 is extended so that the The open shield machine 1 is moved forward with the reaction force against the reaction wall, the first concrete box 4 forming the underground structure is suspended from above, and the propulsion is shrunk in the tail portion 1c of the open shield machine 1 Set behind jack 2. A strut is disposed between the propulsion 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 upper surface of open shield machine 1. At the same time as or after this earth removal step, the propulsion jack 2 is extended to advance the open shield machine 1. In this advancement process, a press bar 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 reacts from the concrete box 4 set on the rear side. Take.

  Then, the second concrete box 4 is suspended in the tail portion 1 c of the open shield machine 1 in front of the first concrete box 4. Thereafter, the same earth removal process, advance process, and concrete box 4 setting process are repeated as appropriate, and the concrete boxes 4 are sequentially left in the ground as the open shield machine 1 moves forward. Put backfill 5 on the upper surface of the body 4.

  When the concrete box 4 is suspended in the tail part 1c of the open shield machine 1, a height adjusting material 7 such as a concrete block is disposed under the concrete box 4, and the concrete part 4 is placed in the tail part 1c. The grout material 6 is filled in the left and right and lower spaces of the box 4.

  In this way, if the open shield machine 1 reaches the reaching mine, it is removed and the construction is completed.

  In such an open shield construction method, as described above, the concrete box 4 is left in the ground in a column as the open shield machine 1 advances, and the concrete box 4 is suspended in the tail portion 1c of the open shield machine 1. As the open shield machine 1 moves forward, it leaves the tail portion 1c and remains in the ground. The open shield machine 1 takes a reaction force on the concrete box 4 left in the ground in this way. Advance.

  In addition to the open shield machine, as shown in FIG. 12, the machine body is divided into a plurality of parts in the front-rear direction, the front end of the rear machine body as the tail part 1c is slightly reduced in cross-sectional area, and this is used as the front part 1d. There are some which are fitted at the rear end of the machine body in front of the vehicle and can be bent at the middle bent portion 1e as a mutual fitting portion to enable curve construction or to correct the direction.

  This has a front end and an upper surface of the front body as the front portion 1d as open surfaces, and the folded jacks 30 are arranged on the left and right and rearward and rearward in a plurality of stages in the vertical direction. . On the other hand, the tail portion 1c has the propulsion jacks 2 arranged on the left and right sides and in a plurality of upper and lower stages toward the front and rear in the body. In the figure, 50 is a movable split blade provided at the front end of the front portion 1d, 51 is a rear retaining plate provided at the rear end of the tail portion 1c, 34 is a strut, and 8 is a press bar (push angle).

  In any of the shield machines, the concrete box 4 to be used is made of reinforced concrete, and as shown in FIG. 13, it is an integral unit composed of a left side plate 4a, a right side plate 4b, an upper floor plate 4c, and a lower floor plate 4d. Is opened as an opening 10.

  By the way, there is a case where the improvement work of the waterway is done by the open shield method. In order to relocate the existing waterway that had been on the ground until then, the existing waterway was dammed in the middle with sandbags or blocks, and excavated along this waterless waterway that was dammed to take in that part, Underground structures will be constructed as waterways.

  The construction method is that the open shield machine is opposed to the rear of the existing waterway, the existing waterway is removed from the rear for each section, and then the propulsion jack is extended by the amount removed, and the concrete box is made the reaction force and the shield machine is Set a new concrete box behind the propulsion jack that has been advanced and shrunk within the tail of the shield machine. This is repeated as appropriate to sequentially embed concrete boxes in columns.

  However, in order to keep the water in the existing water channel closed during the construction period, it is necessary to secure a route for draining in place of the existing water channel, which requires much labor. Also, if there is heavy rain during the construction period, the water that flows into the waterless canal that has been dammed up will flow from the rear end of the existing canal, and the surrounding ground will be scoured by the water. There was a risk of adverse effects on the surrounding area.

  Further, water from the existing water channel flows into the open shield machine 1 and is further blocked by the partition wall 3, which accumulates at the front of the open shield machine 1 and overflows, exposing the worker to a very dangerous state. There was a fear.

Therefore, by sending the water from the existing water channel to the repaired water channel behind the open shield machine, it is not necessary to secure a separate drainage route, and there is a danger that the water flowing into the open shield machine overflows during heavy rains. The following patent documents exist as techniques that can be avoided.
JP-A-6-158993

  As shown in FIG. 14, the partition wall 3 has a lower portion connected by a hinge 21 so that the partition wall can be tilted forward. In normal construction, the partition wall 3 is erected and there is running water in the open shield machine 1 from the front. The partition 3 is tilted to form a ridge with the left and right side wall plates 1a and the partition 3, and the running water is passed through the open shield machine 1 and sent backward.

  However, when the outer width of the existing water channel is smaller than the inner width of the front part of the open shield machine 1, the partition wall 3 is tilted while the rear end of the existing water channel is stored in the front part of the open shield machine 1. If it is discharged from the water channel, water can be sent to the rear of the open shield machine 1 without leaking outside from this, but depending on the circumstances of the surrounding environment, only an open shield machine with the same width as the existing water channel can be introduced. In this case, the outer width of the existing water channel is larger than the inner width of the open shield machine 1.

  In such a case, the rear end of the existing water channel cannot be taken into the front part, and the existing water channel is always located on the front outside of the open shield machine. A large amount of water leaks from between the front end of the section and the rear end of the existing waterway, and the surrounding ground is scoured.

  Also, if the surrounding ground is loose and easy to collapse, if the outer width of the existing water channel is smaller than the inner width of the open shield machine 1, the rear end of the existing water channel is taken into the front part of the shield machine, and soil is removed by the side wall plate of the front part. By removing the existing water channel in the front part while being fastened, it is possible to prevent the collapse of surrounding ground, but it is impossible if the outer width of the existing water channel is larger than the inner width of the open shield machine Therefore, there is a risk that the side ground will collapse during the repair work of the existing waterway.

  For example, when the existing water channel 40 including the left and right side walls 42 and the bottom floor plate 41 as shown in FIG. 15 is removed and replaced with a water channel using a new concrete box, the front channel is removed while the existing water channel 40 is removed. The excavation and earth excavation in the part 1d and in front of it and the propulsion of the open shield machine 1 will be carried out. However, when the side wall 42 is removed, the earth retaining by the side wall 42 is released.

  For this reason, in the case where the surrounding natural ground is easy to collapse, the natural ground around the removed waterway is indicated by an arrow in the figure due to a time lag from when the side wall 42 is removed until the open shield machine 1 is propelled. In this way, the front portion 1d collapses inward and loosens, and the ground is depressed, affecting the surroundings.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and to send the water of the existing water channel backward through the open shield machine, so that it is not necessary to secure a separate drainage route even during the repair work of the existing water channel. Even if the outer width is larger than the inner width of the front part of the shield machine, it is possible to reduce the influence of the existing canal by the open shield method, which can suppress the influence on the surroundings such as scouring and loosening of the surrounding ground due to the renovation of the existing canal. It is to provide a repair method and an open shield machine.

  In order to achieve the above-mentioned object, first, the method of refurbishing an existing water channel by the open shield method of the present invention is to make an existing water channel opposite to an existing water channel having a side wall and a bottom floor plate with a U-shaped open shield machine facing the rear. The process of removing each section from the rear, the process of extending the propulsion jack by the removed amount and advancing the shield machine with the reaction force of the concrete box, and the rear of the propulsion jack contracted in the tail part of the shield machine In the method of refurbishing existing water channels by the open shield construction method in which the concrete boxes are laid in columns in sequence by repeating the process of setting a concrete box as appropriate, a shield machine for the closed wall in the width direction of the water channel equipped with a double door with an open door Placed in front of the front part, excavating and excavating the enclosed space between the closed wall and the front part, and the side wall of the existing waterway Repeating the process of opening the door of the closed wall in response to the removal, the process of removing the bottom floor plate of the existing water channel in that state, and the process of moving the shield machine forward by removing the closed wall Is a summary.

  In addition, secondly, when discharging from the existing waterway, open the partition that divides the space inside the open shield machine back and forth and holds the front part, or divide the space inside the open shield machine back and forth. The gist is to open only the upper stage of the partition wall while adjusting the lower level height of the upper and lower two level partition walls holding the front part to the bottom surface height of the existing water channel.

  Moreover, as the open shield machine of the present invention, first, a U-shaped open shield machine is opposed to the rear of the existing water channel, and the existing water channel is removed for each section from the rear, and a propulsion jack is provided for the removed amount. The process of extending the shield machine with the reaction force of the concrete box by stretching and the process of setting a new concrete box behind the propulsion jack shrunk in the tail part of the shield machine is repeated as appropriate, and sequentially In the open shield machine used in the refurbishment method of the existing water channel by the open shield construction method, the closed wall in the width direction of the water channel equipped with an open door with an open door is detachably arranged in front of the front part of the shield machine. This is the gist.

  In addition, secondly, the gist is to arrange between the left and right side wall plates of the open shield machine and to open and close the partition wall that divides the space inside the machine body in the front and rear direction and holds the front part.

  Alternatively, it is arranged between the left and right side wall plates of the open shield machine, and the space inside the machine body is divided in the front and back, and the bulkhead that holds the front part is constructed in two upper and lower stages, and the lower wall is formed on the bottom surface of the existing water channel The gist is that the height can be adjusted and the upper partition can be opened and closed. In this case, in addition to that, the third aspect is that the height adjustment of the lower partition is performed by sliding up and down.

  According to the first aspect of the present invention, by opening the door of the closed wall and guiding the water from the existing water channel into the open shield machine, and allowing this to flow appropriately through the repaired water channel behind, it can be discharged even during the water channel repair work. Therefore, it is not necessary to secure a separate drainage route.

  And even if the outer width of the existing water channel is larger than the inner width of the front part of the open shield machine and cannot be taken into the front part, the front part can be Since the water in the existing water channel can be guided to the open shield machine with the side of the gap formed between it and the existing water channel in front of it being blocked, a large amount of water can be passed between the front part and the existing water channel. Will not leak and scour the surrounding mountains.

  In addition, even if the surrounding ground of the existing waterway is prone to collapse, the front part of the open shield machine is placed in front of the front part in a closed state, and the front part is excavated and earthed. The natural ground will not collapse and swallow into the front, and the surrounding natural ground will not loosen.

  And since the door of the closed wall in front of the front part is opened to the outside corresponding to the removal of the side wall of the existing water channel, the side natural ground is earthed by this door, and the surrounding natural ground even if the side wall is removed Will not loosen.

  And since the bottom floor board of the existing waterway is removed in the state where the side ground is earthed by the door of the closed wall in this way, the surrounding ground is not loosened during that time. Also, until the propulsion of the open shield machine, the closing wall is removed from the front of the front part only after the bottom floor plate is removed, so the earth retaining on the side ground of the existing waterway is released. The time taken is short, and the surrounding ground is not loosened.

  According to the second aspect of the present invention, in addition to the above, a partition wall that divides the space in the open shield machine forward and backward normally restricts the movement of the earth and sand in the front part to the rear part. This will not interfere with the concrete box installation work, and will compact the earth and sand when the open shield machine moves forward, facilitating excavation and soil removal with the excavator, while discharging it from the existing waterway. By opening the partition wall, the water from the existing water channel can be drained through the shield machine to the rear modified water channel.

  According to the third aspect of the present invention, the front portion is normally retained and the earth pressure is adjusted by the closed partition wall, and when discharging from the existing water channel, the partition wall is opened to secure a water passage in the shield machine. In this respect, it is the same as in claim 2 above, but this partition is made up of two steps, only the upper partition is opened and closed, and the height of the lower partition is adjusted to the height of the bottom of the existing water channel so that the open shield Even if there is a difference in height between the bottom of the machine and the bottom of the existing water channel, the upper and lower walls are opened and the water from the existing water channel is moved backward through the shield machine while retaining the earth and sand of the difference in height by the lower wall. Can be sent to.

  According to the fourth to sixth aspects of the present invention, the same effect as that of the first to third aspects of the present invention can be obtained, but with the closing wall as a part of the components of the open shield machine. This is made detachable.

  According to the seventh aspect of the present invention, the height can be easily adjusted by sliding the lower partition wall up and down.

  As described above, the method for repairing an existing water channel by the open shield method and the open shield machine according to the present invention secure a separate drainage route even during the repair work of the existing water channel by sending the water of the existing water channel backward through the open shield machine. There is no need, and even if the existing width of the existing waterway is larger than the inner width of the front part of the shield machine, the impact on the surroundings such as scouring and loosening of the surrounding ground due to the improvement of the existing waterway should be suppressed. Can do.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan view showing a front portion of a first embodiment of an open shield machine of the present invention. Since the open shield method using the open shield machine of the present invention is the same as that of the conventional example, detailed description thereof is omitted here. Moreover, the same code | symbol is attached | subjected about the component same as the said prior art example.

  Similarly to the conventional example of FIG. 12, the open shield machine 1 of the present invention is formed in a U-shaped cross section by the left and right side wall plates 1a and the bottom plate 1b, and the body is divided into a plurality of front and rear parts, and the front part 1d is The front end of the rear airframe is fitted into the rear end of the airframe, and can be bent at the middle bent portion 1e as a mutual fitting portion.

  Moreover, it arrange | positions near the back between the side wall boards 1a of the front part 1d, and is provided with the partition 3 which partitions off the front and back of the open shield machine 1, and opened the front surface, the rear surface, and the upper surface.

  And the front-end | tip of the said side wall board 1a and the bottom board 1b is formed as the blade edge | tip 11. FIG. In addition, since the structure after the folding part 1e and a tail part is the same as that of a prior art example, detailed description is abbreviate | omitted.

  And the closing wall 13 by a metal plate is arrange | positioned in the width direction so that the front of the front part 1d may be covered, and the both ends are bent back so that the front-end | tip of the left-right side wall board 1a may be covered from the outside. The closed wall 13 is provided with a double door 14 that opens outwardly by a hinge 15, and the width of the door 14 part is equal to or larger than the inner width of the existing water channel 40 to be repaired (the width between the inner surfaces of the left and right side walls 42). Set a little smaller.

  The partition wall 3 disposed in the front portion 1d is of an open / close type, such as a vertical slide type (FIG. 3), a shutter type (FIG. 4), a forward tilt type (FIG. 5), a rear folding door type (FIG. 6), a folding type. Various methods such as a door type (FIG. 7) and a front folding door type (FIG. 8) can be adopted.

  Further, in the folded portion 1e, the right and left gaps at the front and rear fitting parts are stopped by a flexible sealing material such as rubber.

  Next, an embodiment of a waterway repair method using the open shield method of the present invention using the open shield machine 1 configured as described above will be described. In addition, since the basic structure of the open shield method used in a present Example is the same as that of the past, detailed description here is abbreviate | omitted.

  First, the water in the existing water channel 40 composed of the left and right side walls 42 and the bottom floor plate 41 is temporarily blocked upstream from the construction site, and the open shield machine 1 is arranged facing the rear end of the existing water channel 40, As shown in FIG. 1 as a first step, a closing wall 13 is disposed in front of the front portion 1d.

  Then, with the door 14 closed, the earth and sand in the front portion 1d is excavated and discharged by an excavator such as a backhoe. At this time, even if the surrounding ground mountain of the existing water channel 40 is easy to collapse, since the front part of the front part 1d is covered by the closing wall 13, the open shield machine is being excavated while excavating the front part 1d. 1 A natural ground in front of the ground does not collapse and sag into the front portion 1d, and the surrounding natural ground does not loosen.

  And after excavating the inside of the front part 1d, the door 14 of the closing wall 13 is opened corresponding to removing one section of the side wall 42 of the existing water channel 40 as a 2nd process. That is, the side wall 42 is removed with the door 14 opened, or the door 14 is opened immediately after the side wall 42 is removed.

  Since the side natural ground is earthed by the opened door 14, even if the side wall 42 is removed, the peripheral natural ground is not loosened. And as a 3rd process, the bottom floor board 41 is removed 1 section. In the meantime, the side natural ground is earthed by the door 14, and the natural ground does not collapse during the removal work.

  Then, as the fourth step, the closing wall 13 is removed and the front portion 1d is opened, the propulsion jack is immediately extended, and the open shield machine 1 is advanced using the rear concrete box as a reaction force, and the front portion 1d is already installed. It is made to oppose the new rear end of the water channel 40. At this time, as the open shield machine 1 moves forward, the earth and sand in the front part 1d are consolidated by the partition wall 3, and excavation and soiling in the front part 1d by the excavator thereafter can be facilitated.

  When the forward movement is finished, the closing wall 13 is immediately disposed in front of the front portion 1d, the propulsion jack is contracted, and a new concrete box is suspended from the tail portion, and the process returns to the first step.

  At this time, the open shield machine 1 is brought close to and opposed to the rear end of the existing water channel 40 so that the gap between the closed wall 13 and the rear end of the existing water channel 40 does not increase. In this state, the closed wall 13 is arranged in the width direction of the water channel and stops the rear end of the existing water channel 40, so that the surrounding natural ground does not collapse toward the space after the rear end of the existing water channel 40.

  In this way, the closing wall 13 is removed from the front of the front portion 1d only for a short time after the bottom floor plate 41 is removed, so the time required for releasing the earth retaining on the side ground of the existing water channel 40 is released. It is short and the surrounding ground is not loosened.

  By repeating the first step to the fourth step, the existing water channel 40 is removed for each section, and the water channel is repaired.

  By the way, after one day of renovation work or when there is running water in the existing water channel 40 due to heavy rain and the like, it is necessary to discharge the water in the existing water channel 40, as shown in FIG. Is disposed in front of the front portion 1d to open the door 14, and the openable partition 3 is opened to form a water passage in the open shield machine 1.

  And if it discharges from the existing water channel 40, water will pass through the inside of the open shield machine 1, and will be drained through the newly installed water channel after the repair. In this way, by opening the door 14 of the closed wall 13 and guiding the water from the existing water channel 40 into the open shield machine 1 and flowing it appropriately to the rear modified water channel, it becomes possible to discharge even during water channel repair work. There is no need to secure a separate drainage route.

  Further, since the outer width of the existing water channel 40 is larger than the inner width of the front portion 1d of the open shield machine 1 and cannot be taken into the front portion 1d, there is a slight distance between the front end of the front portion 1d and the rear end of the existing water channel 40. Even in this case, since the side of the gap is closed by the closing wall 13 and the door 14 thereof, a large amount of water leaks from between the front portion 1d and the existing water channel 40 at the time of discharge, and the surrounding ground is scoured. There is no end to it.

  Since the width of the door 14 is the same as or slightly smaller than the inner width of the existing water channel 40, the tip of the opened door 14 comes into contact with the inner surface of the side wall 42 of the existing water channel 40. No water leaks from the gap and scours the surrounding ground.

  Next, a second embodiment of the present invention will be described. FIG. 9 is a longitudinal side view of a second embodiment of the open shield machine of the present invention. Similarly to the first embodiment, the open shield machine 1 of the present embodiment is also configured such that the machine body is divided into front and rear parts so that it can be freely bent. The open shield machine 1 includes left and right side wall plates 1a and bottom plates 1b and has a U-shaped cross section. The tip of the side wall plate 1a and the bottom plate 1b of the portion 1d is formed as the blade edge 11, and the partition wall 3 is provided near the rear of the front portion 1d.

  And like the said 1st Embodiment, the closed wall 13 by the metal plate provided with the outward opening type door 14 is arrange | positioned in the width direction so that the front of the front part 1d may be covered, and it is at the front-end | tip of the left-right side wall board 1a. Fold both ends back so that they can be covered from the outside.

  The width of the door 14 is set to be the same as or slightly smaller than the inner width of the existing water channel 40 to be repaired (width between the inner surfaces of the left and right side walls 41), but the vertical position of the door 14 is set to the existing water channel 40. The bottom floor plate 41 is provided so as to correspond to a portion above the surface.

  The partition wall 3 disposed in the front portion 1d is configured in two upper and lower stages. Then, in correspondence with the position of the lower partition wall 37, a door pocket 39 is formed vertically downward from the upper surface of the bottom plate 1b of the front portion 1d, and vertical slide grooves (illustrated) are formed inside the left and right side wall plates 1a. Then, the lower end of the lower partition wall 37 is housed in the door pocket 39 so that it can slide up and down.

  Further, the slide range of the lower partition 37 is set to a height range that the bottom surface of the existing water channel 40 can take with respect to the open shield machine 1, and the height of the lower partition wall 37 is set to the height of the bottom surface of the existing water channel 40. So that it can be adjusted according to the

  On the other hand, the upper partition 38 is of an open / close type, and various types of open / close methods can be adopted as in the above embodiment, but the lower end such as the slide type (FIG. 3) or the shutter type (FIG. 4) can be used. In the case of adopting a method capable of adjusting the height, the lower end of the upper partition 38 is set to be lowered to the same height as the upper end of the lower partition 37 in the lowest state.

  Further, when adopting a method in which the lower end height cannot be adjusted, the lower end position is set to the same height as the upper end of the lower partition wall 37 in the lowest position, and before and after the lower partition wall 37. Regarding the positional relationship, the upper partition wall 38 is disposed in the same direction as the opening / closing direction with respect to the lower partition wall 37.

  Next, an embodiment of a waterway repair method using the open shield method of the present invention using the open shield machine 1 configured as described above will be described. In addition, since the basic structure of the open shield method used in a present Example is the same as that of the past, detailed description here is abbreviate | omitted.

  As in the first embodiment, the water in the existing water channel 40 composed of the left and right side walls 42 and the bottom floor plate 41 is temporarily blocked upstream from the construction site, and the open shield machine is opposed to the rear end of the existing water channel 40. 1 is disposed, and the closing wall 13 is disposed in front of the front portion 1d as a first step.

  Then, with the door 14 closed, the earth and sand in the front portion 1d is excavated and discharged by an excavator such as a backhoe. At this time, even if the surrounding ground mountain of the existing water channel 40 is easy to collapse, since the front part of the front part 1d is covered by the closing wall 13, the open shield machine is being excavated while excavating the front part 1d. 1 A natural ground in front of the ground does not collapse and sag into the front portion 1d, and the surrounding natural ground does not loosen.

  And after excavating the inside of the front part 1d, the door 14 of the closing wall 13 is opened corresponding to removing one section of the side wall 42 of the existing water channel 40 as a 2nd process. That is, the side wall 42 is removed with the door 14 opened, or the door 14 is opened immediately after the side wall 42 is removed.

  At this time, even if there is a height difference between the bottom floor plate 41 of the existing water channel 40 and the bottom plate 1b of the open shield machine 1, the door 14 of the closing wall 13 opens at a portion above the bottom surface of the existing water channel 40. The floor board 41 does not hinder the opening of the door 14.

  And since a side natural ground is earthed by this open door 14, even if it removes the side wall 42, a surrounding natural ground will not loosen. The subsequent third and subsequent steps are the same as in the first embodiment, and by repeating the first to fourth steps, the existing canals 40 are removed for each section while suppressing the looseness of the surrounding natural ground. It can be repaired.

  By the way, after one day of renovation work, or when there is running water in the existing water channel 40 due to heavy rain or the like and it is necessary to discharge the water of the existing water channel 40, the closing wall 13 is moved forward of the front portion 1d. It is arranged to open the door 14, and the lower partition 37 is slid up and down to match the height of the bottom surface of the existing water channel 40, and the upper partition 38 is opened to pass water into the open shield machine 1. Form.

  The positioning and fixing when the lower partition 37 is slid up and down is performed by bolting the lower partition 37 to the side wall plate 1a as appropriate.

  And if it discharges from the existing water channel 40, water will pass through the inside of the open shield machine 1, and will be drained through the newly installed water channel after the repair. At this time, even if the sediment below the bottom surface of the existing water channel 40 remains in the front portion 1d, it is retained by the lower partition wall 37, so that the sediment in the front portion 1d is washed away together with water. Therefore, it does not accumulate in the tail portion 1d and obstruct the installation work of the concrete box 4 or accumulate in the existing water channel that has been repaired and narrow the internal space of the water channel.

  In this way, by setting the partition wall 3 in two upper and lower stages, even when there is a height difference between the bottom surface of the open shield machine 1 and the bottom surface of the existing water channel 40, the soil with the difference in height is made to be soiled by the partition wall 37 in the lower stage. The upper partition wall 38 can be opened and water from the existing water channel 40 can be sent backward through the open shield machine 1 while being fastened.

  In addition, it is possible to discharge even during renovation work of the waterway, and it is not necessary to secure a separate drainage route, and at the time of discharge, a large amount of water leaks from between the front part 1d and the existing waterway 40, and the surrounding ground is scoured. The points that will not occur are the same as in the first embodiment.

  The height of the lower partition wall 37 can be adjusted easily by making it vertically slidable. However, the height adjustment method is not limited to this. For example, the lower partition wall 37 is further divided into a plurality of upper and lower parts. It is also possible to adjust according to the number of plates to be arranged.

  By the way, when the door 14 is opened, the front end of the door 14 comes into contact with the inner surface of the side wall 42 of the existing water channel 40. Although the width is set to be slightly the same as or slightly smaller than the width, when the width of each of the left and right doors is smaller than the length of one section of the existing water channel 40, a hinge 16 is attached to the tip of the door 14 as shown in FIG. The extension door 17 may be provided through the gap.

  Thereby, when the door 14 is opened, the front end can be extended, and even after the side wall 42 of the existing water channel 40 is removed by one section, the rear end of the front side wall 42 that has not been removed and the front of the open shield machine 1 are removed. The side portion of the gap with the tip of the portion 1d can be closed by the door 14 and the extended door 17 and earthed.

  In addition, the door 14 of the closing wall 13 can be divided into a plurality of upper and lower parts. Thereby, only the door 14 of the part above the bottom face of the existing water channel 40 can be opened and used, and it can be applied to the repair work of the some existing water channels 40 from which the height of a bottom surface differs.

  Moreover, you may provide the guide groove which mutually fits in the inner side of the bending part of the right-and-left both ends of the closing wall 13, and the side wall board 1a front-end | tip outside of the front part 1d. Thereby, the closing wall 13 can be slid up and down on the front portion 1d to be detachable, and the closing wall 13 can be prevented from being tilted forward of the front portion 1d with the closing wall 13 disposed.

  Further, the closing wall 13 is not only disposed so as to cover the front of the front portion 1d, but can also be detachably disposed at a front position between the left and right side wall plates 1a in the front portion 1d. However, in order to ensure the maximum enclosed space in the front portion 1d by the closed wall 13 and the left and right side wall plates 1a, and to minimize the distance between the closed wall 13 and the rear end of the existing water channel 40, As described above, it is preferable to dispose the closing wall 13 so as to cover the front end of the front portion 1d.

  As described above, all the methods for repairing the water channel by the open shield method according to the above embodiment are performed using the open shield machine 1 including the detachable closing wall 13 with respect to the front portion 1d. In addition, it is also possible to use an existing open shield machine that does not include the closing wall 13 in combination with the closing wall 13 separately.

  Further, the present invention can be applied not only to a bendable open shield machine in which the airframe is divided into a plurality of front and rear parts, but also to an entire open shield machine as shown in FIG.

It is a top view which shows the front part of 1st Embodiment of the open shield machine of this invention. It is a top view which shows the front part of the state which opened the door of the closed wall. It is a side view which shows the 1st example of the opening-closing method of a partition. It is a side view which shows the 2nd example of the opening-closing method of a partition. It is a side view which shows the 3rd example of the opening-closing method of a partition. It is a side view which shows the 4th example of the opening-closing method of a partition. It is a side view which shows the 5th example of the opening-closing method of a partition. It is a side view which shows the 6th example of the opening-closing method of a partition. It is a whole side view which shows 2nd Embodiment of the open shield machine of this invention. It is a top view which shows the other example of a closing wall. It is a vertical side view which shows the outline of an open shield construction method. It is a vertical side view which shows the open shield machine which divided | segmented the conventional airframe forward and backward. It is a perspective view of the conventional concrete box. It is a vertical side view which shows an example of the conventional open shield machine. It is a top view of the front part of the open shield machine used with the repair method of the waterway by the conventional open shield method.

Explanation of symbols

1 Open shield machine 1a Side wall plate 1b Bottom plate 1c Tail part 1d Front part 1e Middle bent part
2 Propulsion jack 3 Bulkhead 4 Concrete box 4a Left side plate 4b Right side plate 4c Upper floor plate 4d Lower floor plate 5 Backfill soil 6 Grout material 7 Height adjusting material 8 Press bar 9 Excavator 10 Opening 11 Cutting edge 13 Closing wall 14 Door 15 , 16 Hinge 17 Extension door 21 Hinge 30 Middle folding jack 34 Strut 37 Lower partition wall 38 Upper partition wall 39 Door pouch 40 Existing water channel 41 Bottom floor plate 42 Side wall 50 Movable split blade 51 Rear retaining plate

Claims (7)

  An open shield machine with a U-shaped cross section is placed in the rear of the existing waterway with side walls and bottom floor plate, and the process of removing the existing waterway for each section from the rear, and extending the propulsion jack by the amount removed, the concrete box An open shield that embeds concrete boxes in series one after another by repeatedly repeating the process of advancing the shield machine with reaction force and the process of setting a new concrete box behind the propulsion jack shrunk in the tail part of the shield machine. In the method of rehabilitating an existing waterway by the construction method, a closed wall in the width direction of the waterway equipped with a double door with an outward opening is placed in front of the front part of the shield machine, and the enclosed space and the inside of the front part are excavated and excavated. A step of opening the door of the closed wall in response to removing one section of the side wall of the existing water channel, and removing one section of the bottom floor plate of the existing water channel in that state Process and refurbishment method of the existing canal with open shield method characterized by repeating the steps of advancing the shield machine to remove the closure wall.   2. The method of repairing an existing water channel by the open shield method according to claim 1, wherein when the water is discharged from the existing water channel, the space inside the open shield machine is divided forward and backward to open a partition wall for retaining the front part.   When discharging from an existing waterway, adjust the lower height of the two upper and lower partition walls that divide the space inside the open shield machine into the front and rear and hold the front part to the bottom height of the existing water channel, A method for repairing an existing water channel by the open shield method according to claim 1 or 2 that is opened.   Open shield machine with U-shaped cross-section facing the existing water channel, removing the existing water channel for each section from the rear, extending the propulsion jack by the amount removed, and using the shield box as a reaction force A method of refurbishing existing waterways by the open shield method, in which the steps of advancing and the step of setting a new concrete box behind the propulsion jack shrunk in the tail part of the shield machine are repeated as appropriate, and the concrete boxes are successively embedded in columns. In the open shield machine used in the above, an open shield machine is characterized in that a closed wall in the water channel width direction having an outwardly opening double door is detachably disposed in front of the front part of the shield machine.   5. The open shield machine according to claim 4, wherein the open shield machine is disposed between the left and right side wall plates of the open shield machine, and a partition wall that divides a space inside the machine body forward and backward and holds the front portion can be freely opened and closed.   It is arranged between the left and right side wall plates of the open shield machine, and the bulkhead that divides the space inside the machine body and holds the front part is constructed in two upper and lower stages, and the lower bulkhead is aligned with the bottom of the existing waterway The open shield machine according to claim 4, wherein the height can be adjusted and the upper partition can be opened and closed.   The open shield machine according to claim 6, wherein the height of the lower partition is adjusted by sliding up and down.

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