JP2819343B2 - Enlargement method of existing sewer and double shield excavator used for the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method of enlarging an existing sewer using a double shield excavator and a double shield excavator used in the method.

<Conventional technology> As a conventional method of expanding an existing sewer, a new sewer having an inner diameter larger than the outer diameter of the existing sewer is penetrated concentrically into the outer ground of the existing sewer. Later, there is known a method of enlarging an existing culvert for removing the existing culvert, which is left inside the new culvert.

Also, with a shield machine equipped with a drilling device at the tip,
It is also known to construct a new duct with a large cross section behind the shield machine after excavating the existing duct and the surrounding ground at the same time.

Furthermore, apart from these methods of expanding existing sewers,
A plurality of shield drums, each having a head cutter mounted on the front surface, are separately supported side by side in a swingable manner on the front side of a common support cylinder, and a neck for swinging these shield drums in opposite directions in a tangential direction. A shield excavator equipped with a swing mechanism has been proposed.

<Problems to be solved by the invention> However, in the conventional method of expanding existing sewers, it is necessary to carry in and out the equipment and excavated soil in the newly constructed sewers. In order to replace the existing sewer where the erection is being carried out, the work space is narrow, it is difficult to carry in and out the equipment and materials, excavated soil, etc. It was necessary to take measures such as temporarily removing the cable.

In addition, in the method of excavating the outer periphery of the existing sewer in an annular shape at the same time as the existing sewer, if the existing sewer lining is a segment, a large number of reinforcing bars and jigs are embedded, so grinding with a machine is not possible. It was difficult, and there was a problem that it could be applied only to cast-in-place concrete.

The present invention has been made in order to solve the above-mentioned drawbacks, and its purpose is to replace existing pipes,
A sufficient space to carry in and out the equipment and materials for the construction of the new sewer and the excavated soil, as well as a method of expanding the existing sewer that can dismantle the existing sewer efficiently to the outside, and using it for the construction method An object of the present invention is to provide a mold shield excavator.

Another purpose is to excavate a tunnel with a diameter larger than necessary, so that it is not necessary to increase the land storage area, and it is also possible to expand the existing sewer by avoiding obstacles around the existing pipe. An object of the present invention is to provide a method for enlarging a sewer and a double shield excavator used for the method.

<Means for Solving the Problems> The present invention is to replace an existing sewer while laying the advantage of a conventional double-type shield excavator for constructing a multi-section shield tunnel. In a shield excavation method in which two shield drums are juxtaposed and a head cutter is attached to the front of each shield drum, and two tunnels are simultaneously excavated using a double shield excavator, By excavating the outer periphery of the existing sewer in a ring shape by the first shield excavator in the excavator, the new sewer is constructed on the outer periphery thereof while the existing sewer is left, and the second shield excavation is performed. The construction method for constructing the new sewer is constructed by a machine, the existing sewer remaining in the new sewer is sequentially dismantled, and the existing sewer carried out from the work sewer is enlarged.

Further, another gist of the present invention is a dual shield excavator in which two shield drums are juxtaposed and a head cutter is mounted on the front surface of each shield drum, wherein the excavator guides an existing sewer. In order to excavate this outer peripheral portion in a ring shape, a first shield excavator having a cutter head having an inner diameter larger than the outer diameter of the existing sewer and a first shield excavator are juxtaposed to the first shield excavator, A second shield excavator for excavating a work for constructing a new sewer by a shield excavator, disposed in the new sewer, and transporting the dismantled existing sewer into the work sewer. Means and a transport means disposed in the work area, for carrying in and out the materials and excavated soil for the newly constructed culvert, and for carrying out the products carried out by the transport means to the outside. In the type shield drilling rig.

In addition, the second shield excavator may include a swing mechanism for swinging the shield drum in order to make a turn around the first shield excavator.

<Operation> The method of enlarging an existing sewer according to the present invention is to construct a new sewer by annularly excavating the outer peripheral part while leaving the existing sewer by the first shield excavator. At the same time, the second shield excavator carries in and out the materials and excavated soil for constructing the new sewer through the work for constructing the new sewer, and the existing sewer remaining in the new sewer. Is dismantled and carried out and removed through the work site.

In addition, the second continuous shield excavator according to the present invention uses the existing sewer as a guide, and the first shield excavator having a cutter head having an inner diameter larger than the outer diameter of the existing sewer uses the outer periphery of the existing sewer. Excavate the part in a ring. At the same time, the second shield excavator will excavate work to construct a new sewer. The equipment and the excavated soil for constructing the new sewer are carried in and out by the conveyance means arranged in the work area. Further, the existing culvert left in the newly constructed culvert is dismantled, and the dismantled material is conveyed into the work area by the above-mentioned conveying means, and is conveyed and removed to the outside by the above-mentioned conveying means.

<Example> An example of a double shield excavator used in the method of the present invention will be described with reference to the accompanying drawings.

As shown in FIG.
The first shield excavator 10 having an inner diameter cutter head larger than the outer diameter of the existing sewer 30 and the first shield excavator 10 are smaller than the first shield A second shield excavator 20 having a diameter and a second shield excavator 20 for excavating a work B for constructing a new sewer A by the first shield excavator 10 is formed. . The first and second shield excavators 10, 20
Is a shield drum 1 with head cutters 11, 21 on the front.
2,22 are arranged side by side and sealed by an air bag 13 arranged in a ring between the donut-shaped shield drum 12 and the existing sewer 30, and the shield drum 22 is fitted to the front end of the support drum 23. In addition, it is swingably supported by the support cylinder 23 and has a so-called swing mechanism.

As shown in FIG. 2, an existing sewer 30 used as a guide for excavation is left behind the first shield excavator 10, and an outer edge of the existing sewer 30 has a new sewer. An erector guide ring 1 that expandably supports an erector 15a used when incorporating a new segment 14 for construction.
Has five. In addition, an electric hoist 16a for carrying the new segment 14 and the dismantled existing sewer 30 is provided in the upper part of the new sewer A behind the lower part.
New segment 14 carried by the electric hoist 16
A segment transporter 17 for transporting a to the excavation tip is provided. In addition, the existing sewer 30 left inside the new sewer A
Is supported from below by an existing sewer temporary support stand 18.

On the other hand, the rear of the second shield excavator 20 is provided with an erector 15b used when incorporating the new segment 14b for constructing the work anti-B, and the upper part inside the work anti-B is transported from the outside by the segment cart 24. An electric hoist 16b for transporting the newly installed segment 14b to the vicinity of the erector 15b is provided.

In addition, between the newly installed sewer A and the work counter B, a material carrying-in port c for carrying in and out of materials and equipment penetrating therethrough is appropriately provided at intervals.

Next, a method of enlarging the newly installed sewer A will be described. First,
While pressurizing the face with muddy water through the mud pipe 40, the outer periphery of the existing sewer 30 is excavated in an annular shape by the first shield excavator 10, and at the same time the work shield B is excavated by the second shield excavator 20. The excavated mud is discharged to the outside through the mud pipe 41. At the time of excavation, the hydraulic shield jack 42 is extended, a reaction force is applied to the tip of the new segments 14a, 14b, the excavation proceeds, and when the shield jack 42 extends a predetermined distance, the excavation is stopped, and the shield jack is stopped. 42 is contracted, and a new segment is assembled in a space created by the contraction.

In the excavation process using this shield excavator,
In the ground in front of the second shield excavator 20, there is an obstacle such as a buried object, and when it hinders excavation, the swing mechanism excavates around the first shield excavator by the swing mechanism. Thus, the obstacle can be avoided.

Next, the new segment 14a is carried in by the segment truck 24 laid on the work counter B, suspended by the electric hoist 16a mounted on the upper part of the new sewer A, and transported onto the segment transporter 17. The new segment 14a carried is
It is conveyed to the front end side by the segment conveyor 17, where it is held by the erector 15a, and then assembled at a predetermined position.

In parallel with this work, the newly-installed segment 14b conveyed from behind by the segment cart 24 in the work counter B,
It is suspended by the electric hoist 16b, carried to the tip side, and similarly assembled at a predetermined position by the erector 15b. In this way, after both the new pipe A and the work counter B have the new segments 14a and 14b incorporated in a ring shape and lining, the excavation is continued by taking the reaction force again to the new segments 14a and 14b at the tips.

On the other hand, the existing culvert 30 left inside the newly constructed culvert A is sequentially dismantled from the rear end. The dismantled product is suspended by the electric hoist 16a, loaded from the material entrance C to the carriage 25 arranged in the work counter B, towed by the battery car 26, and carried out (FIG. 3). The above steps are repeated to construct a new sewer A sequentially. After the construction of the new sewer A, the work counter B can of course be used as a tunnel.

In the case where the existing culvert 30 shown in the present embodiment is a culvert in which power and communication cables are laid, a newly constructed culvert in which a cable 32 (FIGS. 4 and 5) on a cable rack 31 in the existing culvert is constructed. A
It is only necessary to sequentially move the cables 32 onto the cable rack 31 'provided at (see FIG. 1), and it is not necessary to temporarily remove the cables 32.

In another embodiment using this method, concrete or mortar is injected into the outer periphery of the existing sewer without removing the existing sewer, and the existing sewer is reinforced to increase the capacity. It is also possible to hit the work well.

<Effect> According to the method for enlarging the existing sewer according to the present invention, the outer peripheral part is excavated in a ring shape while the existing sewer is left by the first shield excavator of the double shield excavator, and the new construction is performed. While constructing a culvert, the second shield excavator also constructs a work pit for loading and unloading materials and equipment for the construction of the new culvert. Therefore, by carrying in and out materials and excavated soil through the work pit, a work space can be secured without unnecessarily increasing the diameter of the newly installed sewer.

In addition, the existing sewer remaining in the new sewer is dismantled sequentially without using a shield excavator, so the progress of excavation of the new sewer and the crushing and dismantling of the existing sewer are independent work, and efficient construction is performed. be able to.

Furthermore, according to the double shield excavator according to the present invention, the first shield excavator for excavating the outer periphery of the existing sewer in a ring and the second shield excavator are arranged side by side. With the shield excavator described above, excavation can be performed using the existing sewer as a guide, and at the same time, a work pit can be excavated by the second shield excavator adjacent thereto. In addition, a transportation means for transporting the dismantled existing culvert and a transportation means for carrying in and out the dismantled material and materials for constructing a new culvert are provided in the work pit, so that a sufficient work space can be secured and efficient. It is possible to construct a new culvert and remove the existing one.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially transparent perspective view showing a double shielded digging apparatus according to the present invention, and FIG. 2 is a perspective view of a double shielded digging apparatus showing a situation where a newly installed segment is incorporated. FIG. 3 is a cross-sectional view of a double shielded excavator showing a situation in which a dismantled existing sewer is carried out and removed, and FIG.
FIG. 5 is a sectional view taken along line IV-IV in FIG. 5, and FIG. 5 is a sectional view taken along line VV in FIG. 1 double shield excavator, 10 first shield excavator, 20 second shield excavator, 30 existing sewer, 16a, 16b electric hoist (transportation means), 24 …… Segment trolley (transportation means), 25 …… Dolly (transportation means).

Claims (3)

(57) [Claims] 1. A shield excavation method in which two shield drums are juxtaposed and a head cutter is mounted on the front of each shield drum, and two tunnels are simultaneously excavated using a double shield excavator. By excavating the outer periphery of the existing sewer in an annular shape by the first shield excavator in the double shielded excavator, a new sewer is constructed on the outer periphery of the existing sewer while leaving the existing sewer. A method for constructing a work channel for the construction of the new sewer with the second shield excavator, and sequentially dismantling the existing sewer remaining in the new sewer and carrying out the work from the work sewer to enlarge the existing sewer. 2. A double shield drilling machine in which two shield drums are juxtaposed and a head cutter is mounted on the front surface of each shield drum. A first shielded excavator having a head cutter with an inner diameter larger than the outer diameter of the existing sewer, and a first shielded excavator juxtaposed to the first shielded excavator A second shield excavator for excavating a work channel for constructing a new sewer by arranging in the new sewer, transport means for transporting the dismantled existing sewer into the work sewer, A double shielded excavator, which is provided in the work area, and is provided with carrying means for carrying in and out the materials and excavated soil for the newly constructed culvert, and carrying out the goods carried out by the carrying means to the outside. apparatus. 3. The second shield excavator is provided with a swing mechanism for swinging the shield drum in order to perform turning excavation around the first shield excavator. The double-type shield excavator according to claim 1.