JPH08333987A - Open shield tunneling method and open shield machine - Google Patents

Abstract

PURPOSE: To decrease the quantity of underground water entering the inside of a machine from other than water permeable holes by providing water permeable holes on the lower side of the body of an open shield machine, and discharging the water entering through the water permeable hole to lower the underground water level outside of the open shield machine. CONSTITUTION: An open shield machine 1 is so constructed that in the front part 1a, the tips of a side wall plate 2 and a base plate 3 are formed as a cutting edge, and propulsion jacks 4 are arranged on upper and lower sides in such a manner as to be directed to the rear inside the side wall plates 2 both in the front part 1a and in the tail part 1b. Water permeable holes 13 are bored in the lower sides of the right and left side wall plates 2 of the above open shield machine 1. The number and size of the water permeable holes 13 are suitably selected, and for example, they are provided in the rear of a partition 5 in the front part 1a. A mesh 14 is disposed as a sediment inflow preventing means in the water permeable hole 13. A joint is projected from the periphery of the water permeable hole 13 inward, and the end part of a water feed pipe is connected to the joint to be guided to the ground, so that water entering through the water permeable holes 13 is discharged by driving a pump.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open shield construction method for constructing underground structures such as water supply and sewerage systems, common ditches, telegraphs, telephones, and other underground passages, and an open shield machine used therefor.

[0002]

2. Description of the Related Art The open shield construction method is a highly rational construction method that takes advantage of the advantages of the open cut construction method (open cut construction method) and the shield construction method. The outline is shown in FIGS. 9 to 12. In FIG. 9, reference numeral 1 is an open shield machine, which is a shield having front and rear surfaces and an upper surface formed of left and right side wall plates 2 and a bottom plate 3 connected to these side wall plates 2. It is a machine.

As shown in the figure, the open shield machine 1 is divided into a front portion 1a and a tail portion 1b so that the open shield machine 1 can be used for curve construction, and the ends are loosely fitted to each other.

The open shield machine 1 has a front portion 1a.
In the above, the tip ends of the side wall plate 2 and the bottom plate 3 are formed as the blade openings 2, and the propulsion jacks 4 are arranged vertically side by side inside the side wall plate 2 in both the front portion 1a and the tail portion 1b. Regarding the front part 1a, the partition wall 5 divides the front part 1a into an excavation part in the first half and a propulsion part by the propulsion jack 4 in the latter half.

As shown in FIG. 9, the open shield machine 1 is installed in the starting pit 8 and the propulsion jack 4 of the shield machine 1 is extended to apply a reaction force to the reaction force wall 6 in the starting pit 8. Front part 1a and tail part 1b are sequentially advanced individually,
The first concrete box 7 forming the underground structure is suspended from above and set behind the propulsion jack 4 which is contracted in the tail portion 1b of the shield machine 1. In the figure, 10 is a strut, which is disposed between the propulsion jack 3 and the reaction force wall 6 for adjusting the gap as appropriate. Further, the start pit 8 is composed of a retaining wall. To start the open shield machine 1, a part of this retaining wall is cut into mirrors, but if necessary, ground improvement is performed in front of the start pit 8 by injecting a chemical solution or the like. May be given.

Then, the excavator 9 such as a shovel excavates and discharges earth and sand from the front surface or the upper surface of the front portion 1a of the open shield machine 1. Simultaneously with or after this soil discharging step, the propulsion jack 4 is extended to sequentially advance the front portion 1a and the tail portion 1b individually.

[0007] And the first concrete box 7
The second concrete box 7 is hung in the tail part 1b of the shield machine 1 before.

As shown in FIGS. 10 and 11, the same soil discharging step, advancing step, and setting step of the concrete box 7 are repeated as appropriate to sequentially move the concrete box 7 as the open shield machine 1 advances. The concrete boxes 7 are left in the columns in the ground, and the upper surface of the concrete box 7 is backfilled.

In this way, as shown in FIG. 12, when the open shield machine 1 reaches the reaching pit 12, it is removed and the construction is completed.

[0010] With such an open shield construction method, in the case of targeting an aquifer ground due to a river repair or the like, the groundwater level is high and there is a risk of inundation during construction. Such water intrusion can be prevented by the partition wall 5 at the excavated portion at the tip of the front portion 1a, but it is difficult to prevent it at the mutual loose fitting portion of the front portion 1a and the tail portion 1b, and the propulsion jack 4 is installed. Water accumulates at the location and the location where the concrete box 7 is placed, which hinders the work.

As a countermeasure, the above-mentioned chemical solution injection or freezing method is used to improve the ground at all the planned construction sites to suppress water infiltration and allow water ingress into the open shield machine. Emissions are being carried out as quickly as possible.

[0012]

However, the conventional method of improving the ground to suppress the intrusion of water into the open shield machine requires a separate ground improvement work, resulting in a high construction cost and a long construction period. . On the other hand, the method of drawing out the invaded water into the open shield machine is not sufficient because it cannot completely remove the water, depending on the capacity of the pump.

An object of the present invention is to provide an open shield construction method and an open shield machine capable of eliminating the disadvantages of the conventional example and easily and reliably suppressing the intrusion of groundwater into the open shield machine.

[0014]

In order to achieve the above-mentioned object, the present invention provides an open shield construction method for an open shield machine in which propulsion jacks are arranged inside the left and right side wall plates and the front, rear and upper surfaces are opened. The process of excavating and removing earth and sand from the front or top opening, the process of extending the propulsion jack to make the concrete box react to make the shield machine move forward, and the rear of the propulsion jack compressed in the tail part of the shield machine. In the open shield construction method in which the step of suspending and setting a new concrete box from above is appropriately repeated and the concrete boxes are sequentially buried in a column,
The open shield machine has a water permeation hole below the fuselage, discharges infiltration water from this water permeation hole to lower the groundwater level outside the open shield machine, and the water permeation hole is provided in the lower part of the left and right side wall plates, Alternatively, it is a gist that the water-permeable hole is provided on the bottom plate, and further, a water pipe for forced water supply by a pump is connected to the water-permeable hole, and infiltration water from the water-permeable hole is sucked and forcibly discharged. .

The first open shield machine is the first
, The propulsion jacks are installed inside the left and right side wall plates,
In an open shield machine with an open rear and upper surface,
A water permeation hole with a mesh or slit means for preventing sediment inflow was provided below or on the bottom wall of the left and right side wall plates. Secondly, a water pipe was connected to the water permeation hole, and this was installed along the inner side of the left and right side wall plates. To guide it to the ground. Third, connect a water pipe to the permeation hole and guide it to the launch pit through the open shield machine and the concrete box in parallel. Fourth, pump the water pipe. The gist is to dispose.

[0016]

According to the present invention as set forth in claim 1, a water permeation hole is provided below the body of the open shield machine by the open shield construction method, and infiltration water is discharged from the water permeation hole to adjust the groundwater level outside the open shield machine. By lowering it, it is possible to reduce the amount of groundwater that enters the open shield machine from other than the water permeable holes as much as possible, and it is possible to prevent work in the open shield machine from being hindered. Also, unlike the installation of a well point outside the open shield machine, drainage can be done from the open shield machine itself, so you can save the trouble of installing other equipment, and the drainage point as the open shield machine progresses. Can be moved easily.

According to the second aspect of the present invention, the groundwater is taken into the open shield machine from the outside of the lower portions of the left and right side wall plates. According to the present invention of the third aspect, from the outside of the bottom plate part. Groundwater will be taken into the open shield machine, and both can lower the groundwater level outside the open shield machine.

According to the fourth aspect of the present invention, a water supply pipe for forcibly supplying water by a pump is connected to the water permeation hole, and the infiltration water from the water permeation hole is sucked and forcibly forced by utilizing the suction force of the pump. By discharging, it is possible to more reliably lower the groundwater level outside the open shield machine.

According to the fifth aspect of the present invention, the groundwater is taken into the open shield machine from the outside of the lower portions of the left and right side wall plates as the open shield machine, and the infiltrated water is discharged to the outside of the open shield machine. The groundwater level can be lowered. At that time, it is possible to prevent the sediment from flowing in together with the groundwater by the sediment inflow preventing means using the mesh or the slit.

According to the sixth aspect of the present invention, as the open shield machine, groundwater is taken into the open shield machine from the outside of the bottom plate, and the same effect as that of the fifth claim can be obtained.

According to the present invention of claim 7, waste water can be treated with a water pipe having a length as short as possible.
According to the present invention described, it can be dealt with by performing wastewater treatment at the start pit in the case of construction in a narrow place where there is not enough site on the left and right of the open shield machine. Further, according to the present invention as set forth in claim 9, the infiltration water from the water permeable hole is sucked and forcibly discharged using the suction force of the pump,
It is possible to more reliably lower the groundwater level outside the open shield machine.

[0022]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a vertical sectional front view showing a first embodiment of an open shield construction method and an open shield machine of the present invention, FIG. 2 is a vertical sectional side view of the same, and the same components as those of FIGS. Reference numerals are attached.

The general outline of the open shield construction method is as described with reference to FIGS.
Further, the open shield machine 1 also has a basic configuration in which the front, rear, and upper surfaces of the left and right side wall plates 2 and the bottom plate 3 connected to the side wall plates 2 are opened.

In the illustrated example, the open shield machine 1 is divided into a front portion 1a and a tail portion 1b so that the open shield machine 1 can cope with a curve construction, and the ends are loosely fitted to each other.

In the open shield machine 1, the front end of the side wall plate 2 and the bottom plate 3 are formed as blades in the front part 1a, and both the front part 1a and the tail part 1b propel the inside of the side wall plate 2. The jacks 4 are arranged side by side in the vertical direction facing backward. Regarding the front part 1a, the excavation part in the first half and the propulsion jack 4 in the second half are separated by the partition wall 5.
It is divided into the propulsion section by.

In the present invention, the water-permeable holes 13 are formed below the left and right side wall plates 2 of the open shield machine 1. The number and size of the water permeation holes 13 may be arbitrary, but for example, they are provided behind the partition wall 5 in the front portion 1a.

A mesh 14 is arranged in the water permeable hole 13 as a means for preventing the inflow of sediment, but instead of the mesh 14, slits may be formed by a lattice to prevent the inflow of sediment.

Further, a joint 15 is provided from the periphery of the water-permeable hole 13 to the inside.
The water supply pipe 16 is connected to the joint 15, and the water supply pipe 16 is raised along the inside of the left and right side wall plates 2 and guided to the ground. Further, a pump 17 is arranged in the middle of the water supply pipe 16.

The open shield construction method using the open shield machine 1 having such water-permeable holes 13 is as described above. As shown in FIG. 9, the open shield machine 1 is installed in the start pit 8. Then, the propulsion jack 4 of the shield machine 1 is extended and a reaction force is applied to the reaction force wall 6 in the starting pit 8 to sequentially advance the front portion 1a and the tail portion 1b individually to form an underground structure. The first concrete box 7 is suspended from above and set behind the propulsion jack 4 which is contracted in the tail portion 1b of the shield machine 1.

Then, the excavator 9 such as a shovel excavates and discharges earth and sand from the front surface or the upper surface of the front portion 1a of the open shield machine 1. Simultaneously with or after this soil discharging step, the propulsion jack 4 is extended to sequentially advance the front portion 1a and the tail portion 1b individually.

Then, the first concrete box 7
The second concrete box 7 is hung in the tail part 1b of the shield machine 1 before.

As shown in FIGS. 10 and 11, the same earth discharging step, advancing step, and setting step of the concrete box 7 are repeated as appropriate to sequentially move the concrete box 7 as the open shield machine 1 moves forward. It is left in the column in the ground, and the upper surface of this concrete box 7 is backfilled. As shown in Fig. 12, when the open shield machine 1 reaches the reaching pit 12, remove it and complete the construction. To do.

When the pump 17 is driven in such a process to discharge the infiltrated water from the water permeation hole 13 to the ground through the water pipe 16, the groundwater level outside the open shield machine 1 is shown by a chain line. Can be lowered to

As a result, it is possible to reduce the amount of groundwater entering the open shield machine 1 as much as possible from the water permeation hole 13 and especially from the place where the front portion 1a and the tail portion 1b are fitted together. It can be done without any hindrance.

FIGS. 3 and 4 show a second embodiment of the present invention, in which the water pipe 16 is passed through the concrete box 7 in the open shield machine 1 and the vertical line to the start pit 8 (see FIG. 9 and subsequent figures). Decided to lead.

Further, as a third embodiment, as shown in FIGS. 5 and 6, the water permeation hole 13 may be provided in the bottom plate 3 of the open shield machine 1. Other this water permeable hole
The number and size of 13 may be arbitrary, for example, the front part 1
a behind the partition wall 5 and the water-permeable hole 13
A mesh 14 is provided as a means for preventing sediment inflow,
It is the same as in the first embodiment that slits may be formed with a lattice instead of the mesh 14 to serve as a soil and sand inflow preventing means.

Further, a joint 15 is provided from the periphery of the water-permeable hole 13 to the inside.
The water supply pipe 16 is connected to the joint 15, and the water supply pipe 16 is raised along the inside of the left and right side wall plates 2 and guided to the ground. Further, the point that a pump 17 is arranged in the middle of the water supply pipe 16 is also the same as the first embodiment.

A water-permeable hole provided on the bottom plate 3 by driving the pump 17.
Even if the infiltrated water from 13 is discharged to the ground via the water pipe 16,
The groundwater level outside the open shield machine 1 can be lowered like a chain line.

As shown in FIGS. 7 and 8, the water pipe 16 may be guided to the start pit 8 in the open shield machine 1 and through the concrete box 7 arranged in parallel.

[0040]

As described above, the open shield construction method and the open shield machine of the present invention can easily and reliably suppress the intrusion of groundwater into the open shield machine, and as a result, the work inside the open shield machine is hindered. It can be prevented from becoming.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a first embodiment of an open shield construction method and an open shield machine of the present invention.

FIG. 2 is a vertical sectional side view showing a first embodiment of the open shield construction method and the open shield machine of the present invention.

FIG. 3 is a vertical sectional front view showing a second embodiment of the open shield construction method and the open shield machine of the present invention.

FIG. 4 is a vertical sectional side view showing a second embodiment of the open shield construction method and the open shield machine of the present invention.

FIG. 5 is a vertical sectional front view showing a third embodiment of the open shield method and the open shield machine of the present invention.

FIG. 6 is a vertical sectional side view showing an open shield method and an open shield machine according to a third embodiment of the present invention.

FIG. 7 is a vertical sectional front view showing a fourth embodiment of the open shield construction method and the open shield machine of the present invention.

FIG. 8 is a vertical sectional side view showing a fourth embodiment of the open shield construction method and the open shield machine of the present invention.

FIG. 9 is a vertical sectional side view of a first step showing an outline of an open shield construction method.

FIG. 10 is a vertical sectional side view of a second step showing an outline of the open shield construction method.

FIG. 11 is a vertical cross-sectional side view of a third step showing the outline of the open shield construction method.

FIG. 12 is a vertical cross-sectional side view of a fourth step showing the outline of the open shield construction method.

[Explanation of symbols]

 1 ... Open shield machine 1a ... Front part 1b ... Tail part 2 ... Side wall plate 3 ... Bottom plate 4 ... Propulsion jack 5 ... Partition wall 6 ... Reaction wall 7 ... Concrete box 8 ... Start pit 9 ... Excavator 10 ... Strut 11 ... Ground improvement 12… Reaching shaft 13… Permeation hole 14… Mesh 15… Joint 16… Water pipe 17… Pump

Claims (9)

[Claims] 1. A process of arranging propulsion jacks inside left and right side wall plates, excavating and discharging earth and sand from the front or top opening of an open shield machine having front, rear and top openings, and extending the propulsion jack. Repeat the process of moving the shield machine forward by using the concrete box as a reaction force and the step of suspending and setting a new concrete box from the top behind the propulsion jack contracted in the tail part of the shield machine. In the open shield method of sequentially burying concrete boxes in a vertical line, the open shield machine has a water permeation hole below the machine body and discharges infiltration water from this water permeation hole to lower the groundwater level outside the open shield machine. The characteristic open shield construction method. 2. The open shield method according to claim 1, wherein the water-permeable holes are provided in the lower portions of the left and right side wall plates. 3. The open shield construction method according to claim 1, wherein the water-permeable hole is provided in the bottom plate. 4. The open shield according to claim 1, wherein a water supply pipe for forcibly supplying water by a pump is connected to the water permeable hole, and infiltration water from the water permeable hole is sucked and forcibly discharged. Construction method. 5. An open shield machine in which propulsion jacks are arranged inside the left and right side wall plates, and the front, rear and upper surfaces are opened, the lower part of the left and right side wall plates is provided with a means for preventing inflow of earth and sand by mesh or slits. An open shield machine with a water-permeable hole. 6. An open shield machine in which propulsion jacks are arranged inside the left and right side wall plates, and the front, rear and upper surfaces are opened, the bottom plate is provided with a water permeation hole provided with a means for preventing sediment inflow with mesh or slits. An open shield machine characterized by that. 7. A water supply pipe is connected to the water permeable hole, and this is erected along the inside of the left and right side wall plates and guided to the ground.
Alternatively, the open shield machine according to claim 6. 8. The open shield machine according to claim 5 or 6, wherein a water supply pipe is connected to the water permeable hole, and the water supply pipe is guided to the start pit through the inside of the open shield machine and the arranging concrete box. 9. The open shield machine according to claim 5, wherein a pump is provided in the water supply pipe.