JP4015658B2 - How to demolish existing waterways - Google Patents

Description

  The present invention relates to a method for demolishing an existing water channel such as a fence.

  When the existing waterway such as a fence fence is demolished and a new concrete box is constructed by laying a new cylindrical concrete box, it is necessary to remove the existing fence fence and drill below to a depth where a new concrete box can be installed. There is a risk that the side ground will collapse during excavation. Therefore, conventionally, as a means for preventing natural collapse, for example, a retaining plate such as a sheet pile is built, and the pile is fastened by using an upset or a cutting beam.

  And the range piled by the mechanical method in this way is excavated with an excavator, and after excavation, for example, a concrete box is newly laid with an open shield machine.

  The prior art is generally performed by those skilled in the art, and does not relate to a known literature invention.

  In the above-mentioned method, in order to hold the side, a retaining plate such as a retaining plate, a belly upset, and a cutting beam is separately required. However, the process of excavating the front and the process of newly laying the concrete box are separate operations, and in this respect, the workability is not good.

  The purpose of the present invention is to eliminate the inconvenience of the conventional example, and does not require a supporting plate such as a retaining plate, a bellows, and a cut beam, and can be earthed with a simple structure using an open shield machine, and is stable. An object of the present invention is to provide a method of demolishing an existing water channel that can excavate the front in a state and improve safety, and can construct a new concrete box while excavating and improve workability.

The present invention achieves the above-mentioned object, and the invention according to claim 1 is characterized in that a water stop panel is disposed in an existing water channel in a direction perpendicular to the existing water channel, and the front portion of the open shield machine is provided. The stable liquid injection section is formed by the partition wall, the lateral retaining plate, and the water stop panel, and excavating the stable liquid into the stable liquid injection section and excavating the existing waterway such as fences It is what.

According to the first aspect of the present invention, the front partition of the open shield machine and the side earth retaining plate are used, and a simple structure in which a water stop panel is disposed in front of the partition wall, and the four sides are enclosed. A stable liquid injection section is formed, and if the stable liquid is injected into this stable liquid injection section, the surroundings , especially the side grounds, can be loosened, so drilling while pouring and tearing existing waterways such as fences Thus, the front of the open shield machine can be excavated in a stable state with a simple structure, and workability is also improved.

  According to a second aspect of the present invention, the stable liquid injection section is defined as a first stable liquid injection section, and a front portion thereof is partitioned by another water stop panel to form a second stable liquid injection section. Simultaneously with the propulsion, the water stop panel of the first stable liquid injection section is removed, and the muddy water in the first stable liquid injection section flows into the second stable liquid injection section, and the second stable liquid injection section is renewed. The gist is to excavate the first stabilizing liquid injection section while injecting the stabilizing liquid, and to repeat this to tear down the existing waterway such as a fence.

  According to the second aspect of the present invention, if water is poured into the first stable liquid pouring section and the advancing while excavating the inside of the section, the concrete box can be laid simultaneously at the rear, and the workability is good. At the same time as digging through the first stable liquid injection section, the water stop panel is removed, the gate is opened, and the muddy water in the first stable liquid injection section flows out into the second stable liquid injection section, and the second If the inside of this section is dug while water is poured into the stable liquid pouring section, it is possible to advance while continuously pouring water without interruption, and workability is improved.

As described above, the method for demolishing an existing waterway according to the present invention does not require a retaining plate such as a retaining plate, upset, or a cut beam, and uses a partition wall or a lateral retaining plate of an open shield machine to install a water stop panel. A simple structure that can be simply placed can hold a fixed section in front, and the front can be excavated in a stable state, improving safety, and laying a new concrete box at the same time as digging improves workability. It can be done.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figure 1 is a plan view showing a general example of a demolition method already設水path, FIG 2 is a ibid vertical sectional side view, reference numeral 1 is an open shield machine 2 cutting edge of the front portion of the open shield machine 1, 3 bulkhead A case where the existing waterway, for example, the fence 4 is demolished will be described as an example.

  The open shield machine 1 is arranged behind the existing fence 4 and the first water stop panel 5 is arranged in a direction perpendicular to the fence 4 at a predetermined interval (for example, one span of the beam). The 2nd water stop panel 6 is arrange | positioned by the predetermined space ahead. In this case, the fixing means of the first and second water stop panels 5 and 6 fixes the end portions of the water stop panels 5 and 6 to the side wall of the fence 4.

  An excavator 8 such as a backhoe is mounted on the open shield machine 1. In the figure, reference numeral 7 denotes a newly installed cylindrical concrete box. The height of the concrete box 7 is larger than the depth of the existing fence 4 and the concrete box 7 is installed. To do so, it is necessary to dig deeper below the existing fence 4.

  In order to demolish the existing fence 4 and newly lay the concrete box 7, the range surrounded by the first water stop panel 5, the blade 2 and the partition 3 arranged in front of the open shield machine 1. Is formed as the first stable liquid injection section 9, and the fence 4 is removed while the stable liquid 11 is injected into the first stable liquid injection section 9.

  Thereby, even if the existing fence 4 is removed, the surrounding ground is not loosened because the stabilizing liquid 11 is injected, and collapse can be prevented. As the stabilizer 11, for example, a mixture of bentonite and a thickener (CMC) is used, and this stabilizer 11 is mixed with excavated soil produced by excavating the lower side of the existing fence 4 and stirred. . As a result, the excavated soil becomes viscous due to the viscosity of bentonite whose viscosity has been further increased by the thickener, and therefore it is difficult to collapse.

  In this way, the excavator 8 further excavates the bottom of the fence 4 in the first stable liquid injection section 9 to discharge the excavated soil. When the stabilizing liquid 11 decreases, water is poured as needed, and excavation is performed to advance the open shield machine 1, and further excavation is performed to inject the stabilizing liquid 11 and the open shield machine 1 is advanced. By repeating this process, the fence 4 in the first stable liquid injection section 9 is demolished and the lower part is excavated. During this time, since the stabilizing liquid 11 is poured into the space surrounded by the partition wall 3, the blade edge 2, and the water stop panel 5, it can be excavated in a stable state without flowing out to the surroundings.

  Then, the open shield machine 1 moves forward, and a cylindrical concrete box 7 is installed in the space formed in the tail portion to newly build a culvert.

  In a state where excavation of the first stable liquid injection section 9 has progressed, the first water stop panel 5 is removed, and the stable liquid 11 in the first stable liquid injection section 9 is changed to the second stable liquid injection section 10. The second stable liquid injection section 10 is removed in the same manner as the first stable liquid injection section 9 and the fence 4 is removed and excavated.

  In this way, the second stable liquid injection section 10 is used as a new first stable liquid injection section, and the front thereof is further partitioned by another water stop panel to form a new second stable liquid injection section. . By repeating this, the existing fence 4 is demolished and a new concrete box 4 is laid.

FIGS. 3 to 5 show an embodiment of the method for demolishing an existing water channel according to the present invention . As a type of the open shield machine 1, a lateral earth retaining plate 12 protruding by a slide jack is disposed in front of the blade mouth 2, and FIGS. Since the box suspension frame 13 in which a hoist or the like is combined with a portal frame at the upper part of the machine body , the basic configuration and method are the same as those in the above-described general example, detailed description thereof will be omitted here. The

Then, if this is by projecting the lateral earth retaining plate 12 in the forward direction to form a first stable liquid water injection section 9 in this lateral earth retaining plate 12 and the partition wall 3 and the water shut-off the panel 5. Compared with the case of the first embodiment, the first stable liquid injection section 9 is more prevented from collapsing the side ground due to the presence of the lateral earth retaining plate 12, and the first stable liquid injection section 9 The deviation of the stabilizing liquid 11 poured into 9 can also be prevented.

  In addition, when the concrete box 7 is installed in the place of the gate-type box hanging equipment 13 provided in the open shield machine 1, the tail section of the open shield machine 1 is provided by the box hanging equipment 13. Can be easily suspended. Therefore, the concrete box 7 can be sequentially laid at the same time in the rear while the open shield machine 1 is moved forward to excavate and discharge the first stable liquid injection section 9.

It is a top view which shows the general example of the demolition method of the existing water channel. It is a vertical side view which shows the general example of the demolition method of the existing waterway. Is a plan view showing an implementation form of demolition method of the existing waterways present invention. It is a vertical sectional side view showing the implementation of the method demolition of existing waterways present invention. Is a front view showing an implementation form of demolition method of the existing waterways present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Open shield machine 2 Cutting edge 3 Bulkhead 4 Fence fence 5 1st water stop panel 6 2nd water stop panel 7 Concrete box 8 Excavator 9 1st stable liquid injection section 10 2nd stable liquid injection section 11 Stabilizing liquid 12 Side retaining plate 13 Box hanging equipment

Claims (2)

Positioned in front of the open shield machine, a water stop panel is installed in the existing water channel in a direction orthogonal to this, and a stable liquid injection section is formed by the front partition of the open shield machine, the side earth retaining plate, and the water stop panel. A method of demolishing an existing water channel, characterized in that the existing water channel such as a fence is excavated by digging while injecting a stabilizing liquid into the stable liquid injection section.   The said stable liquid injection section is made into the 1st stable liquid injection section, the front is divided by another water stop panel, the 2nd stable liquid injection section is formed, and the 1st stable liquid is simultaneously formed with the propulsion of the open shield machine. The water stop panel of the water injection section is removed and the muddy water in the first stable liquid injection section flows into the second stable liquid injection section, and the second stable liquid injection section is used as a new first stable liquid injection section. 2. The method for demolishing an existing water channel according to claim 1, wherein excavation is performed while injecting a stabilizing liquid, and the water channel such as an existing fence is demolished by repeating the excavation.

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