Method of laying u-shaped open conduit in open shield method for repairing existing waterway or existing fence conduit and open shield machine used therefor

Abstract

To provide a method for repairing an existing water channel and an existing fence channel capable of rapidly forming a U-shaped concrete water channel in the ground by using an open shield machine.SOLUTION: The open shield machine is used as an open shield machine in which a front end of a front machine body as a front part is inserted into a rear end of a rear machine body as a tail part to be bendable, and a plurality of stages of propulsion jacks are arranged to extend rearward from both sides of a front end part in the tail part. A U-shaped concrete channel is formed by repeating a process of excavating and discharging earth and sand from an upper surface opening of the front part, a process of advancing by using a reaction force of a U-shaped concrete culvert laid behind the open shield machine by extending the propulsion jack, a process of conveying a plurality of divided U-shaped concrete culverts in a U-shaped culvert laid behind the open shield machine, and a process of assembling the conveyed U-shaped concrete culverts in the tail part.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present invention relates to a U-shaped open channel construction method for the open shield method used to renovate existing waterways and existing fence culverts, and to an open shield machine used for this method. [Background technology]

[0002] The open shield method is a highly rational method that takes advantage of the advantages of the open cut method and the shield method. An outline of the method is shown in Figure 21. In the figure, 1 is an open shield machine, which is a shield machine with openings on the front, back, and top, consisting of left and right side wall panels 1a and a bottom plate 1b connected to these side wall panels 1a.

[0003] The open shield machine 1 has propulsion jacks 3 arranged vertically on the left and right sides of the cross section from the front end portion to the rear within the tail portion 16.

[0004] The open shield machine 1 has a body divided into a front section 2 and a tail section 16 in the longitudinal direction, and the front end of the tail section 16 is fitted into the rear end of the front section 2, forming a bending section 17 at the mutual fitting section, making it bendable. A bending jack 11 is provided at this bending section 17.

[0005] The front section 2 is mainly used as the excavation section, and as mentioned above, the tail section 16 is where the propulsion jack 3 is located, and the concrete box 4 is suspended and installed inside the tail section 16.

[0006] In the figure, 9 is a sliding retaining plate provided at the front end of the front section 2, and although not shown, a sliding jack is incorporated.

[0007] When constructing an underground structure by burying concrete boxes 4 under a road, the open shield machine 1 is assembled in a predetermined position inside the departure shaft 7, and then the propulsion jacks 3 of the open shield machine 1 are extended to move the open shield machine 1 forward using the reaction force of the reaction wall 8 installed inside the departure shaft 7, and the first concrete box 4 that will form the underground structure is lowered from above and set behind the retracted propulsion jacks 3 inside the tail section 16 of the open shield machine 1. At this time, a lifting machine 14 is positioned behind the departure shaft 7.

[0008] The concrete boxes 4 that are laid sequentially inside the departure shaft 7 are boxes that are propelled a predetermined distance after the open shield machine 1 advances forward and exits the departure shaft 7, and are temporarily installed as reaction force transmission materials until the propulsion force of the open shield machine 1 is no longer transmitted to the reaction force wall 8 inside the departure shaft 7, at which point they are removed.

[0009] The starting shaft 7 is constructed with a retaining wall 18 such as a steel sheet pile, and in order to start the open shield machine 1, a part of the retaining wall in front of it is cut into a mirror.

[0010] After cutting off a portion of the retaining wall in front of the departure shaft 7, an excavator 6 such as a shovel is used to excavate and remove earth and sand from above the ground in front of the open shield machine 1.

[0011] Simultaneously with or after this excavation and earth removal process, the propulsion jack 3 is extended to move the open shield machine 1 forward.

[0012] After the open shield machine 1 moves forward the length of one box, the second concrete box 4 is lifted and lowered into the tail section 16 of the open shield machine 1 by a lifting machine 14 and set in front of the first concrete box 4.

[0013] Thereafter, the same excavation and soil removal process, advancement process, and concrete box 4 setting process are repeated as appropriate, and the concrete boxes 4 are successively left in the ground in a vertical row as the open shield machine 1 advances, and backfilling 5 is performed on the top surfaces of these concrete boxes 4, and the surface is paved.

[0014] In the process of setting the concrete box 4, after the concrete box 4 is set inside the tail machine, the backfill injection material 15 is injected as a primary injection, and the backfill injection material 15 is injected as a secondary injection into voids that occur in the ground during the excavation, soil removal and forward movement processes of the open shield machine 1.

[0015] Once the open shield machine 1 reaches the destination tunnel, it is removed and the construction is completed.

[0016] The concrete box 4 is made of reinforced concrete or precast reinforced concrete, and is a rectangular one-piece structure consisting of a left slab, a right slab, a top slab, and a bottom slab, with openings on the front and back. Summary of the Invention [Problem to be solved by the invention]

[0017] The waterway formed in the concrete box 4 using the open shield method is a culvert, and there are no prior art documents for the open shield method that show the installation of a U-shaped concrete open culvert instead of this concrete box 4 as an open culvert.

[0018] Furthermore, when the open shield method is used for repair work on existing waterways, rivers, or existing fence culverts, there are problems when houses or other structures are close to both sides, and depending on the proximity of the houses, the eaves of the houses may overhang the existing waterway, or when there is an existing bridge along the construction route of the existing waterway.

[0019] If a house is located close to an existing waterway, river, or existing fence culvert, a crane or other lifting equipment used to lay the concrete box cannot enter, so an open shield construction method is used, as shown in Figures 15 to 20, in which box hoisting equipment is installed on the open shield machine.

[0020] The following patent document also shows an open shield machine equipped with such a box-hanging equipment 39. [Patent Document 1] Patent No. 3194190

[0021] As shown in Figures 17, 18 and 19, the box body hoisting and lowering equipment 39 is formed as a frame with a support pillar 40 erected at the upper end of the tail section 16 and a beam 42 spanning the support pillar 40, with a bracket 41 attached to the inside of the support pillar 40, and this bracket 41 supports the running girder 29 to which the rail 30 is attached, and this running girder 29 is installed so as to protrude rearward from the tail section 16.

[0022] A traveling beam 32, which is driven by a traveling motor 36, is installed on the rails 30 of each traveling girder 29, and a hoist 35 equipped with a traverse motor 37 is attached to a traverse beam 31 that is hung horizontally on the traveling beam 32. Thus, the hoist 35 can travel horizontally in the cross-sectional direction within the box body hoisting and lowering equipment 39.

[0023] As a result, the hoisting machine 35 can travel on the traveling girder 29 and move laterally on the traverse beam 31, so that the box body hoisting equipment 39 equipped with the hoisting machine 35 can hoist the U-shaped concrete open channel 20 into the tail section 16 and install it accurately.

[0024] However, if an existing bridge is installed over an existing river, the open shield machine 1 equipped with the box-body hoisting equipment 39 cannot pass through there, so a method is taken in which the existing bridge 45 is temporarily removed during the construction period, and then restored after the open shield machine 1 has passed through.

[0025] The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional examples and to provide a method for laying a U-shaped open channel using the open shield method in the repair of existing waterways and existing fence culverts that is close to houses, etc., and that can pass under overhead obstacles such as existing bridges and quickly form a U-shaped concrete open channel underground using an open shield machine. [Means for solving the problem]

[0026] In order to achieve the above-mentioned object, the present invention as set forth in claim 1 is an open shield machine that is composed of left and right side wall panels and a bottom panel connected to these side wall panels, and that has openings on the front, rear, and top. The open shield machine is bendable by fitting the front end of the rear body of the rear body, which serves as the tail section, into the rear end of the front body, which serves as the front section. Multi-stage propulsion jacks are arranged so as to extend rearward from both sides of the front end of the tail section, and the machine is used as an open shield machine. The gist of the invention is that a U-shaped concrete waterway is formed underground by repeating the following steps: excavating and discharging earth and sand from the opening on the top surface of the front section and from the front; extending the propulsion jacks to advance the shield machine using a U-shaped open concrete channel laid behind the open shield machine as a reaction force; transporting a U-shaped open concrete channel composed of a plurality of divided concrete blocks inside the U-shaped open channel that has already been laid behind the open shield machine; and assembling the transported concrete blocks of the U-shaped open concrete channel inside the tail section.

[0027] According to the present invention of claim 1, an open channel can be constructed by laying a U-shaped concrete open channel instead of the concrete box used in the conventional open shield method.

[0028] When an open shield machine is used to form a U-shaped concrete waterway in the renovation of an existing waterway or an existing fence culvert, the U-shaped concrete waterway is formed underground by repeating the following steps: excavating and discharging soil, moving the open shield machine forward, transporting a U-shaped concrete open channel made up of multiple divided concrete blocks through the already laid U-shaped open channel behind the open shield machine, and assembling the transported concrete blocks of the U-shaped concrete open channel within the tail section.

[0029] This allows for a smooth series of processes, from the excavation and removal of soil using the open shield machine to the assembly and installation of the U-shaped concrete open channel within the tail section.

[0030] Furthermore, because the U-shaped concrete open channel is assembled and installed inside the tail section of the open shield machine, there is no problem even if the eaves of houses overhang an existing river, and even if there is an existing bridge, the U-shaped concrete open channel can be quickly installed directly below the existing bridge. Therefore, the open shield machine can quickly pass under the existing bridge.

[0031] Furthermore, the installation of the U-shaped concrete open channel involves assembling and installing multiple divided blocks within the tail section, which takes a little more time than installing a single U-shaped concrete open channel within the tail section, but the assembled shape is smaller and the weight is lighter, making the assembly and installation work within the tail section easier.

[0032] The invention of claim 2 is an open shield machine having openings on the front, rear and top, which is made up of left and right side wall plates and a bottom plate connected to these side wall plates, and the open shield machine is bendable by fitting the front end of the rear body as a tail part into the rear end of the front body as a front part, and is used as an open shield machine with multi-stage propulsion jacks arranged so as to extend rearward from both sides of the front end part within the tail part, and a process of excavating and discharging earth and sand from the opening on the top surface of the front part and the front of the open shield machine. The gist of the method is to form a U-shaped concrete waterway underground by repeating the following steps: extending a propulsion jack arranged on the open shield machine and using a U-shaped concrete open channel laid behind the open shield machine as a reaction force to move the shield machine forward; transporting the U-shaped concrete open channel inside the laid U-shaped concrete open channel behind the open shield machine with its longitudinal direction facing the transport direction; and assembling the transported U-shaped concrete open channel inside the tail section.

[0033] According to the invention described in claim 2, in addition to the effect of claim 1, the U-shaped concrete open channel to be installed is formed by using a single U-shaped concrete open channel, which rotates within the tail section and connects to the already laid U-shaped open channel, so the installation work takes less time than a U-shaped concrete open channel made up of multiple divided blocks, and work efficiency is improved.

[0034] Furthermore, compared to U-shaped concrete open channels made up of multiple divided blocks or U-shaped concrete open channels with connecting end faces formed at an angle, U-shaped concrete open channels require fewer formwork to manufacture and are easier to ensure the required processing precision, making them more economical.

[0035] The present invention as set forth in claim 3 is characterized in that the U-shaped concrete open channel has a connecting end surface formed at an angle.

[0036] According to the present invention as set forth in claim 3, the U-shaped concrete open channel to be installed is a single U-shaped concrete open channel with a connecting end face formed at an angle, which is connected to the already laid U-shaped open channel to form a U-shaped concrete waterway, so that the U-shaped concrete open channel can be installed by rotating it at a small angle within the tail section.

[0037] The present invention described in claim 4 is an open shield machine consisting of left and right side wall panels and a bottom panel connected to these side wall panels, with the front, rear and top surfaces open, the rear end of the front body serving as the front section being fitted into the front end of the rear body serving as the tail section so that it can be bent, and multi-stage propulsion jacks are arranged so as to extend rearward from both sides of the front end within the tail section, and the gist of this open shield machine is that the inner width of the tail section is an inner width length that exceeds the diagonal length of the planar outer edge of the U-shaped concrete open channel to be laid.

[0038] According to the present invention described in claim 4, the inner width of the tail section of the open shield machine is set to an inner width length that exceeds the diagonal length of the planar outer edge of the U-shaped concrete open channel to be laid.Therefore, even if the ratio of the width of the U-shaped concrete open channel to the length of the U-shaped concrete open channel is not particularly large, the U-shaped concrete open channel that has been transported within the laid U-shaped concrete open channel behind the open shield machine with its longitudinal direction facing the transport direction can be smoothly rotated and installed within the tail section, and connected to the laid U-shaped concrete open channel to form a U-shaped concrete waterway. [Effects of the Invention]

[0039] As described above, the U-shaped open channel construction method of the present invention for repairing existing waterways and existing fence culverts, and the open shield machine used for this method, can pass under overhead obstacles such as existing bridges during repair work on existing waterways or existing fence culverts close to houses, etc., and can quickly form a U-shaped concrete waterway underground using a U-shaped concrete open channel using the open shield machine. [Brief explanation of the drawings]

[0040] [Figure 1] FIG. 1 is a plan view showing an embodiment of a U-shaped open channel construction method for the open shield construction method for repairing existing waterways and existing fence culverts of the present invention. [Figure 2] This is a longitudinal side view of the situation during excavation, showing an embodiment of the U-shaped open channel laying method using the open shield method for renovating existing waterways and existing fence culverts of the present invention. [Figure 3] FIG. 1 is a longitudinal side view showing the installation of a U-shaped open channel, illustrating an embodiment of the U-shaped open channel laying method of the open shield method for repairing existing waterways and existing fence culverts of the present invention. [Figure 4] FIG. 1 is a plan view showing a first embodiment of a U-shaped open channel construction method for the open shield construction method for repairing existing waterways and existing fence culverts according to the present invention. [Figure 5] FIG. 1 is a perspective view showing a first embodiment of a U-shaped open channel construction method for repairing existing waterways and existing fence culverts according to the present invention. [Figure 6] FIG. 1 is a plan view showing a second embodiment of the U-shaped open channel construction method of the present invention for repairing existing waterways and existing fence culverts. [Figure 7] FIG. 10 is a perspective view showing a second embodiment of the U-shaped open channel construction method for the open shield construction method for repairing existing waterways and existing fence culverts of the present invention. [Figure 8] This is a plan view of a skewed U-shaped concrete open channel used in a second embodiment of the U-shaped open channel laying method using the open shield construction method for renovating existing waterways and existing fence culverts of the present invention. [Figure 9] This is a longitudinal front view of a slanted U-shaped concrete open channel used in a second embodiment of the U-shaped open channel laying method of the open shield construction method for renovating existing waterways and existing fence culverts of the present invention. [Figure 10] This is a longitudinal side view of a slanted U-shaped concrete open channel used in a second embodiment of the U-shaped open channel laying method of the open shield construction method for renovating existing waterways and existing fence culverts of the present invention. [Figure 11] FIG. 10 is a plan view showing a third embodiment of the U-shaped open channel construction method of the present invention for repairing existing waterways and existing fence culverts. [Figure 12] FIG. 10 is a perspective view showing a third embodiment of the U-shaped open channel construction method of the open shield method for repairing existing waterways and existing fence culverts of the present invention. [Figure 13] FIG. 1 is a longitudinal side view of an open shield machine equipped with a conventional lifting facility. [Figure 14] FIG. 14 is a view taken along the line AA in FIG. [Figure 15] FIG. 1 is a plan view showing an example of a conventional open shield construction method. [Figure 16] FIG. 1 is a side view of an open shield machine excavating, showing an example of a conventional open shield construction method. [Figure 17] FIG. 1 is a side view of a U-shaped concrete open channel being installed, showing an example of a conventional open shield construction method. [Figure 18] This is a longitudinal front view of an open shield machine equipped with box body lifting and lowering equipment. [Figure 19] This is a longitudinal side view of an open shield machine equipped with box body lifting and lowering equipment. [Figure 20] This is an oblique view of an open shield machine equipped with box body lifting and lowering equipment. [Figure 21] FIG. 1 is a perspective view showing a typical construction method using the open shield method. DETAILED DESCRIPTION OF THE INVENTION

[0041] The following describes in detail the embodiments of the present invention with reference to the drawings. Figure 1 is a plan view showing an embodiment of the method for laying a U-shaped open channel using the open shield method for repairing existing waterways and existing fence culverts of the present invention. The repair work is for an existing waterway 49 with houses nearby on both sides, and the riverbed of the existing waterway 49 is dug down to install a U-shaped concrete open channel.

[0042] In the figures, 1 is an open shield machine, which, as can be seen from Figures 13 and 14, consists of a front section 2 and a tail section 16, with the front section of the tail section 16 fitting into the rear of the front section 2, and the fitting section is bent at a center bend 17, making it bendable. As shown in Figure 5, the front section 2 and tail section 16 are made up of a bottom plate 1b and left and right side wall plates 1a, and the top is open.

[0043] Sliding earth retaining plates 9 with built-in slide jacks 10 are provided on both ends of the front section 2. These sliding earth retaining plates 9 can be extended forward, and have the function of preventing loosening of the side ground when the face in front of the front section 2 is excavated while forming a slope.

[0044] The propulsion jacks 3 are arranged at the front end side of the tail section 16 facing rearward, side by side, and in multiple stages, both vertically and horizontally.

[0045] The inner width 16 of the tail portion of the open shield machine 1 is set to be greater than the diagonal length of the planar outer edge of the U-shaped concrete open channel to be laid, as described below.

[0046] Usually, the set inner width of the tail of the open shield machine is (Inner width of tail section) = (Outer width of U-shaped concrete open culvert) + (One-side tail clearance (= approx. 100 mm) x 2) + (One-side margin (= 20 mm or more) x 2) is. In addition, the length of the U-shaped concrete open channel is usually 1500 mm. As a concrete example, the calculation is as follows: U-shaped concrete open channel outer width = 3000 mm, U-shaped concrete open channel length = 1500 mm Then, (Diagonal length of the outer edge of the U-shaped concrete open channel) = 3354 mm This is larger than the inner width of the tail section (=3240 mm), and the U-shaped concrete open channel cannot be rotated and installed within the tail section.

[0047] For this reason, the length of the U-shaped concrete open channel must be kept to around 1200 mm or less, which would mean that a large number of U-shaped concrete open channels would need to be manufactured and installed along the construction route, making it uneconomical and lengthening the construction period.Incidentally, if the length of the U-shaped concrete open channel is set to 1200 mm, the diagonal length of the outer edge of the U-shaped concrete open channel will be 3231 mm.

[0048] In contrast, in the case of the open shield machine described in claim 4, the inner width of the tail section is set to be greater than the diagonal length of the planar outer edge of the U-shaped concrete open channel to be laid, so even if a normal U-shaped concrete open channel with a width of 1,500 mm is used, it can be installed inside the tail section without any problems.

[0049] Next, the open shield machine 1 equipped with the lifting equipment 28 of the present invention will be described with reference to Figures 13 and 14. The lifting equipment 28 is as follows: A traveling girder 29 is provided extending rearward from the tail section 16 and fixed to the upper ends of the side wall panels 1a on both sides of the tail section with bolts 38.

[0050] The front and rear ends of both running girders 29 are fixed to fixed beams 33 between the running girders, forming a frame-like structure in plan view.

[0051] The hoist 35 is installed on the traverse beam 31 so that it can move traversely in the cross-sectional direction of the tail portion 16, and can be moved traversely by a traverse motor 37.

[0052] Both ends of the traverse beam 31 are laid across the travel beams 32 installed on the travel girders 29, so that the vehicle can travel using a travel motor 36.

[0053] Figures 1 and 2 show the situation when the open shield machine 1 is digging under the existing bridge 45. Because the distance between the open shield machine 1 and the existing bridge 45 is small, the excavator 6 cannot be positioned forward or mounted on the front part 2, so here manual excavation 44 is used.

[0054] A transporting facility 22 is placed behind the tail section 16. The transporting facility 22 is composed of a battery locomotive 23 and a transporting carriage 24, and a surplus soil loading vessel 26 for loading excavated soil excavated inside the front section 2 of the open shield machine 1 is placed on the transporting carriage 24.

[0055] A rail system 25 is laid on the bottom slab in the U-shaped concrete open channel 20 that has already been laid behind the open shield machine 1, allowing the transport system 22 to travel on top of it.

[0056] Usually, existing waterways and existing fence culverts are made of concrete. Therefore, before excavation, the existing waterway 49 is first chipped and removed by one excavation length of the open shield machine 1 (the length of the U-shaped concrete open culvert). In this embodiment, the riverbed of the existing waterway is removed.

[0057] Next, while manual excavation 44 is being carried out within the front section 2, the excavated soil is loaded by a belt conveyor 43 into a surplus soil loading vessel 26 placed on a transport cart 24 of the transport equipment 22 arranged at the rear.

[0058] While the open shield machine 1 excavates as described above, the propulsion jack 3 is extended and the open shield machine 1 is propelled forward via the press bar 13, while the propulsion reaction force of the open shield machine 1 is applied to the U-shaped concrete open channel 20 abutting the press bar 13 and the U-shaped concrete open channel 20 connected to the rear of the press bar 13.

[0059] Once the excavated soil is loaded into the soil loading vessel 26, the transporting equipment 22 transports it to the departure shaft 7, and the soil loading vessel 26, now filled with excavated soil, is lifted to the ground by a lifting machine 14 placed above the departure shaft 7, and the excavated soil is loaded onto a soil removal dump truck 27 and removed.

[0060] The above steps are repeated while the open shield machine 1 is advanced along one length of the U-shaped concrete open channel 20.

[0061] Furthermore, if, as the open shield machine 1 advances, the rear of the belt conveyor 43 can no longer reach the waste soil loading vessel 26, the waste soil loading vessel 26 can be lifted up by the lifting equipment 28 installed on the top of the tail section 16 of the open shield machine 1 and moved toward the tail section 16, allowing the loading of excavated soil to continue.

[0062] The next step is the transportation of the U-shaped concrete open channel 20 and the assembly and installation process inside the tail section 16 of the open shield machine 1.

[0063] After the open shield machine 1 has finished excavating one length of the U-shaped concrete open channel 20, the divided U-shaped concrete open channel 20 is suspended below the shaft by a lifting machine 14 placed on the ground of the starting shaft 7, and loaded onto a transport cart 24 of the transport equipment 22 that has been placed there.

[0064] As shown in Figure 14, the U-shaped concrete open channel 20 is made up of a pair of L-shaped concrete blocks 20a, which are connected at the connecting end faces 21 of the bottom slabs of the U-shaped concrete open channel 20. As shown in Figure 1, these connecting end faces 21 are staggered in the extension direction of the U-shaped concrete open channel.

[0065] A pair of L-shaped concrete blocks 20a of a U-shaped concrete open channel 20 loaded onto a transporting facility 22 at the departure shaft 7 is transported to the rear of the tail section 16 of the open shield machine 1.

[0066] Next, the hoist 35 of the lifting equipment 28 is used to hoist either the left or right L-shaped concrete block 20a within the tail section 16, and it is installed so that its cross section matches the U-shaped concrete open channel 20 already laid at the front, and the other L-shaped concrete block 20a is installed in the same way.

[0067] When the lifting equipment 28 installed in the tail section is used to transport soil or assemble and install blocks for a U-shaped concrete open channel within the tail section, the work does not have to be lifted on the ground as in the case of using a crane or box-hoisting equipment, and the assembly and installation work of the blocks can be performed inside the tail section below the top of the tail section 16.

[0068] Therefore, when repairing existing waterways, rivers, or existing fenced culverts that are close to houses on both sides, the eaves of the houses will not hinder the work, even if they overhang the waterway, etc. Also, as shown in Figures 2, 3, and 5, even if there is an existing bridge 45, it is possible to quickly lay a U-shaped concrete open culvert directly below the existing bridge 45 without removing the existing bridge 45.

[0069] Although not shown, the connecting end faces of the U-shaped concrete open channels 20 are joined with bolts, and the connections between the U-shaped concrete open channels are fastened with PC steel rods.

[0070] In addition, the primary injection using backfill injection material 15 after installing the U-shaped concrete open channel 20 at the tail portion 16 and the secondary injection using backfill injection material 15 when the open shield machine 1 is excavating are carried out in the same manner as described above.

[0071] The above steps are repeated to lay a U-shaped concrete open channel.

[0072] Next, a second embodiment of the present invention will be described with reference to Figures 6 to 10. The excavation by the open shield machine 1 and the removal of excavated soil are the same as in the first embodiment. Here, we will describe the shape, structure, and installation of a U-shaped concrete open channel with an obliquely formed connection end face, i.e., an oblique cut U-shaped concrete open channel 46.

[0073] As shown in Figures 8 to 10, the oblique cut U-shaped concrete open channel 46 used in this second embodiment is an oblique cut U-shaped concrete open channel 46 formed so that the connecting end faces of the U-shaped concrete boxes to be laid are oriented at an angle and both side walls are perpendicular to the laying extension direction.

[0074] In the figure, 19 is a PC steel rod, 47 is a PC steel rod box cutout for fixing both ends of the PC steel rod 19 with bolts or the like, and 48 is a grout hole for filling with pre-installed backfill injection material 15.

[0075] The obliquely cut U-shaped concrete open channel 46 is suspended below the shaft 7 by a lifting machine 14 placed on the ground of the departure shaft 7, and is placed on the transport cart 24 of the transport equipment 22 with the longitudinal direction of the obliquely cut U-shaped concrete open channel 46 facing the transport direction.

[0076] The transport equipment 22 travels on a rail system 25 installed on the bottom slab of an already laid oblique cut U-shaped concrete open channel 46 and transports the work to the rear of the tail section 16 of the open shield machine 1.

[0077] Then, the oblique cut U-shaped concrete open channel 46 is lifted by the lifting equipment 28, moved to the tail section, rotated and installed within the tail section 16, and connected to the already laid oblique cut U-shaped concrete open channel 46 to form a U-shaped concrete waterway.

[0078] As shown in Figure 6, the oblique cut U-shaped concrete open channel 46 to be installed has an angled connection end face, so it can be installed within the tail section 16 with a small amount of rotation, and there is no need to widen the inner width of the tail section 16 of the open shield machine 1.

[0079] As described above, in the same way as in the first embodiment, when repairing an existing waterway / river or an existing fenced culvert with houses nearby on both sides, the eaves of the houses do not obstruct the work even if they overhang the waterway, etc. Furthermore, as shown in Figures 2, 3, 6, and 7, even if there is an existing bridge 45, it is possible to quickly lay a U-shaped concrete open culvert directly below the existing bridge 45 without removing the existing bridge 45.

[0080] The third embodiment will be described with reference to Figures 2, 3, 11, and 12. In the third embodiment, the excavation of the open shield machine 1 and the transportation of the U-shaped concrete open channel 20 to be laid are the same as in the second embodiment, and therefore will not be described here.

[0081] The U-shaped concrete open channel 20 transported to the rear of the tail section of the open shield machine 1 is lifted by the lifting equipment 28, moved to the tail section, rotated and installed within the tail section 16, and connected to the already laid U-shaped concrete open channel 20.

[0082] Furthermore, as per the set inner width of the tail section 16 of the open shield machine 1, for example, if the outer width length of the U-shaped concrete open channel 20 is 3000 mm and the width is 1200 mm, there is no need to widen the inner width of the tail section 16.

[0083] As described above, as in the first embodiment, when repairing existing waterways, rivers, or existing fenced culverts that are close to houses on both sides, the eaves of the houses, etc., extending over the waterways, etc., will not hinder the various work operations.

[0084] Furthermore, as shown in Figures 2, 3, and 5, even if there is an existing bridge 45, it is possible to quickly lay a U-shaped concrete open channel directly below the existing bridge 45 without removing the existing bridge 45. [Explanation of symbols]

[0085] 1...Open shield machine 1a...Side wall plate 1b...Bottom plate 2...Front part 3...Propulsion jack (shield jack) 4...Concrete box 5...Backfill 6...Excavator 7...Starting shaft 8...Reaction wall 9...Sliding retaining plate 10...Slide jack 11...Bending jack 13...Press bar (push angle) 14...Lifting machine 15...Backfill injection material 16...Tail section 17...Bent section 18...Retaining wall 19...PC steel rod 20...U-shaped concrete open channel 20a...L-shaped concrete block 21...Connection end face 22...Transportation equipment 23...Battery locomotive 24...Transportation cart 25...Rail equipment 26... Vessel for loading surplus soil 27... Dump truck for transporting surplus soil 28... Lifting equipment 29... Traveling girder 30...Rail 31...Travel beam 32...Running beam 33...Fixed beam 34...Stopper 35...Winding machine 36...Travel motor 37...Travel motor 38...Bolt 39...Box lifting equipment 40...Support 41...Bracket 42...Beam 43...Conveyor belt 45...Existing bridge 46...Oblique cut U-shaped concrete open channel 47...PC steel bar box punch 48...Grout hole (hole for filling backfill injection material) 49...Existing waterway 50...Manual excavation

Claims

1. An open shield machine consisting of left and right side wall plates and a bottom plate connected to these side wall plates, with the front, rear and top sides open, and the open shield machine is bendable by fitting the front end of the rear body as a tail part into the rear end of the front body as a front part, and is used as an open shield machine with multi-stage propulsion jacks arranged so as to extend rearward from both sides of the front end part within the tail part, a step of excavating and discharging earth and sand from the opening on the upper surface of the front portion and from the front side; a step of extending the propulsion jack to advance the shield machine using a U-shaped concrete open channel laid behind the open shield machine as a reaction force; a step of transporting a U-shaped concrete open channel made up of a plurality of divided concrete blocks through an already laid U-shaped open channel behind the open shield machine; Assembling the transported U-shaped concrete open channel blocks in the tail section; By repeating this process, a U-shaped concrete channel is formed underground. This is a U-shaped open channel construction method for repairing existing waterways and existing fence culverts, using the open shield method.

2. An open shield machine consisting of left and right side wall plates and a bottom plate connected to these side wall plates, with the front, rear and top sides open, and the open shield machine is bendable by fitting the front end of the rear body as a tail part into the rear end of the front body as a front part, and is used as an open shield machine with multi-stage propulsion jacks arranged so as to extend rearward from both sides of the front end part within the tail part, a step of excavating and discharging earth and sand from an opening on the top surface of a front portion of the open shield machine and from the front; a step of extending a propulsion jack disposed on the open shield machine to advance the shield machine using a U-shaped concrete open channel laid behind the open shield machine as a reaction force; a step of transporting the U-shaped concrete open channel through the laid U-shaped concrete open channel behind the open shield machine with the longitudinal direction facing the transport direction; assembling the transported U-shaped concrete open channel within the tail section; By repeating this process, a U-shaped concrete channel is formed underground. This is a U-shaped open channel construction method for repairing existing waterways and existing fence culverts, using the open shield method.

3. 3. A method for laying a U-shaped open channel using an open shield method for repairing an existing waterway or an existing fence culvert according to claim 2, wherein the U-shaped concrete open channel has a connecting end face formed at an angle.

4. An open shield machine consisting of left and right side wall panels and a bottom plate connected to these side wall panels, with openings on the front, rear and top, the front end of the rear body serving as the tail section fitting into the rear end of the front body serving as the front section so that it can be bent, and multi-stage propulsion jacks arranged so as to extend rearward from both sides of the front end within the tail section, wherein the inner width of the tail section of the open shield machine is an inner width length that exceeds the diagonal length of the planar outer edge of the U-shaped concrete open channel to be laid, an open shield machine used in a U-shaped open channel laying method using the open shield construction method for renovating existing waterways and existing fence culverts.

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