JPH06158993A - Method of open shield construction and open shielding machine - Google Patents

Abstract

PURPOSE:To conduct proper treatment by skillfully sending back water flowing into an open shielding machine at the time of a local severe rain, etc., in a method of open shield construction. CONSTITUTION:In an open shielding machine 1, which is composed of left and right sidewall plates 1a and a bottom plate 1b connected to these sidewall plates 1a and in which a front surface, a rear surface and a top face are opened and in which the front ends of the sidewall plates 1a and the bottom plate 1b are formed in cutting edges, partition walls 3 are installed at the centers of the sidewall plates 1a and propulsive jacks 2 are arranged and disposed vertically toward the rear at the rears of the partition walls 3, the lower sections of the partition walls 3 are bonded by hinges, and brought to a freely inclinable state toward the front. The partition wall 3 is erected previously at the time of normal execution, the partition wall 3 is inclined and a gutter is composed of the left and right sidewall plates 1a and the partition wall 3 when water flows in the open shielding machine 1 from the front, and flowing water is passed in the open shielding machine 1, and sent to the rear.

Description

Detailed Description of the Invention

[0001]

[Industrial field of application] The open shield method is a highly rational method that takes advantage of the open cutting method (open cut method) and the shield method. The outline is shown in FIG. 5. In FIG. 5, reference numeral 1 denotes an open shield machine, which is a shield machine having left and right side wall plates 1a and a bottom plate 1b connected to the side wall plates 1a and having front, rear and upper surfaces opened. . The open shield machine 1 is formed with the tip ends of the side wall plate 1a and the bottom plate 1b as blades, and a partition wall 3 is formed at the center of the side wall plate 1a.
Further, the propulsion jacks 2 are arranged rearward of the partition wall 3 and are arranged side by side in the vertical direction.

Although not shown, the open shield machine 1 is installed in the starting pit, the propulsion jack 2 of the shield machine 1 is extended, and a reaction force is applied to the reaction wall in the starting pit to advance the shield machine 1. Then, the first concrete box 4 that forms the underground structure is suspended from above and set behind the propulsion jack 2 that is contracted in the tail portion 1c of the shield machine 1. Struts are arranged between the propulsion jack 2 and the reaction wall to adjust the distance as appropriate. In addition, the start pit is composed of a retaining wall, and in order to start the open shield machine 1, a part of this retaining wall is cut off with a mirror. However, if necessary, ground improvement is applied to the front part of the starting pit by injecting a chemical solution or the like. Sometimes I leave it.

An excavator 9 such as a shovel excavates and discharges earth and sand from the front surface or the upper surface of the open shield machine 1. Simultaneously with or after this soil discharging step, the propulsion jack 2 is extended to advance the shield machine 1. For this forward step,
In front of the concrete box 4, a pushing angle 8 made of a frame body made of box steel or shaped steel is provided. Then, the second concrete box 4 is suspended in front of the first concrete box 4 in the tail portion 1c of the shield machine 1. Hereinafter, the same soil discharging process, advancing process, and setting process of the concrete box 4 are appropriately repeated to sequentially leave the concrete box 4 in the ground in parallel with the advancing of the open shield machine 1, and further to this concrete box. Backfilling 5 is applied to the upper surface of 4.

If the partition wall 3 is provided, it consolidates the earth and sand when the open shield machine 1 is excavated, and the excavator 9 excavates and
It is possible to easily remove soil.

The concrete box 4 is shielded by the shield machine 1
When suspending in the tail portion 1c of, the height adjusting material 7 such as a concrete block is arranged below the concrete box 4, and in the tail portion 1c, in the voids on the left and right sides and the lower portion of the concrete box 4. The grout material 6 is filled.

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

[0007]

[Problems to be Solved by the Invention] By the way, there is a case where a river is repaired by the open shield method. In order to relocate the canal that had been on the ground up to that time, the existing canal was blocked halfway and excavated along this damned waterless canal to capture that part, creating a new canal. Underground structures are constructed.

If there is a heavy rain during the construction period due to such river repair work, the water flowing into the waterless canal that has been blocked becomes running water and flows into the open shield machine 1.
Further, it is blocked by the partition wall 3, and this may be accumulated in the front portion of the open shield machine 1 and overflow to cause a very dangerous state.

An object of the present invention is to solve the problems of the conventional example, and to provide an open shield construction method and an open shield machine capable of appropriately sending water flowing into the open shield machine to the rear during a heavy rainfall to perform an appropriate treatment. To provide.

[0010]

In order to achieve the above object, the present invention is a shield machine having left and right side wall plates and a bottom plate connected to these side wall plates, the front and rear surfaces of which are open. The tip of the bottom plate is formed as a blade opening, a partition wall is provided in the center of the side wall plate, and further, the propulsion jacks are arranged rearward of the partition wall and arranged vertically side by side. The step of excavating and discharging the earth and sand, and the step of extending the propulsion jack and making the concrete box a reaction force to advance the shield machine,
In the open shield construction method of sequentially burying concrete boxes in parallel in a row by appropriately repeating the process of suspending and setting a new concrete box from the top behind the propulsion jack that has been compressed in the tail part of the shield machine. Shall be able to tilt forward, and this partition should be erected during normal construction.If there is running water in the open shield machine from the front, the partition should be tilted to form a gutter with the left and right side wall plates and the partition. The main idea is to send running water backward through the inside of the open shield machine.

[0011]

According to the present invention, when there is running water from the front in the open shield machine due to heavy rainfall, the partition walls are tilted to form a gutter by the left and right side wall plates and the partition walls, and the running water is passed through the open shield machine. Since the water can be sent to the rear, it is possible to prevent water from collecting in the front part of the open shield machine and overflowing to cause a very dangerous state.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a vertical sectional side view showing an embodiment of an open shield machine used in the open shield construction method of the present invention,
2 is a plan view of the same as above, and FIG. 3 is a front view of the same as above, in which the same components as those in FIG.

The open shield machine 1 of the present invention is also a shield machine having left and right side wall plates 1a and a bottom plate 1b connected to the side wall plates 1a and having front, rear and upper surfaces opened, and the tip ends of the side wall plates 1a and 1b. Is basically the same in that the partition wall 3 is formed in the center of the side wall plate 1a, and the propulsion jacks 2 are arranged rearward of the partition wall 3 in the vertical direction. .

In the present invention, the lower end of the partition wall 3 is a bottom plate 1b.
It was connected to the board 10 which was launched from above via a hinge 11 so that it could be tilted forward.

Reference numeral 12 in the drawing denotes a frame body provided in the open shield machine 1. The hydraulic cylinder 13 having one end pin-coupled to the frame body 12 has the other end pin-coupled to the partition wall 3, and the hydraulic cylinder 13 partitions the partition wall. Suspend 3.

The partition wall 3 may have a U-shaped cross section having side walls 3a on its left and right sides, and the side walls 3a are joined to the inside of the left and right side wall plates 1a.

The front surface of the substrate 10 is an inclined surface 14 which spreads downward and the inclined surface 14 is integrated with the tip of the bottom plate 1b as a blade portion.

Next, the open shield construction method of the present invention using such an open shield machine 1 will be described.

Although not shown, the open shield machine 1 is installed in the starting pit, the propulsion jack 2 of the shield machine 1 is extended, and a reaction force is applied to the reaction wall in the starting pit to advance the shield machine 1. Then, the first concrete box 4 forming the underground structure is suspended from above and set behind the propulsion jack 2 which is contracted in the tail portion 1c of the shield machine 1. Struts are arranged between the propulsion jack 2 and the reaction wall to adjust the distance as appropriate. In addition, the start pit is composed of a retaining wall, and in order to start the open shield machine 1, a part of this retaining wall is cut off with a mirror. However, if necessary, ground improvement is applied to the front part of the starting pit by injecting a chemical solution or the like. Sometimes I leave it.

An excavator such as a shovel excavates earth and sand from the front surface or the upper surface of the open shield machine 1 and discharges it. In this case, the hydraulic cylinder 13 is contracted and the partition wall 3 is kept in the upright state. The partition wall 3 can consolidate the earth and sand when the open shield machine 1 moves forward, and can facilitate excavation and earth removal by the excavator.

Simultaneously with or after the earth discharging process, the propulsion jack 2 is extended to advance the shield machine 1. In the case of this advancing process, a pushing angle 8 made of a frame body made of box steel or shaped steel is arranged in front of the concrete box 4. Then, the second concrete box 4 is suspended in front of the first concrete box 4 in the tail portion 1c of the shield machine 1. Hereinafter, the same soil discharging step, advancing step, and setting step of the concrete box 4 are appropriately repeated to sequentially leave the concrete box 4 in the ground in a row along with the forward movement of the open shield machine 1, and further to this concrete box. Backfill is applied to the upper surface of No. 4.

Although the above is the usual use, as shown in FIG. 4, as the river improvement work, the existing water canal was shunted along the way to relocate the water canal that had been on the ground up to that time. In some cases, the open shield machine 1 may be dug along the waterless water channel 15 that has been stopped so as to take in that portion.

If heavy rain or the like occurs during the construction work of the river repair work, the hydraulic cylinder 13 is extended to tilt the partition wall 3. In this way, the partition wall 3 and the side wall plate 1
It is possible to form a gutter with a and to flow the running water flowing into the waterless water channel 15 through the open shield machine 1 and the concrete box 4 to the rear.

[0024]

EFFECTS OF THE INVENTION The open shield construction method and open shield machine of the present invention as described above are capable of appropriately sending the water flowing into the open shield machine to the rear side in the case of heavy rainfall and performing an appropriate treatment. .

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of an open shield machine used in an open shield construction method of the present invention.

FIG. 2 is a plan view showing an embodiment of an open shield machine used in the open shield construction method of the present invention.

FIG. 3 is a front view showing an embodiment of an open shield machine used in the open shield construction method of the present invention.

FIG. 4 is a vertical sectional side view showing an open shield construction method of the present invention.

FIG. 5 is a vertical sectional side view showing an outline of a conventional open shield method.

[Explanation of symbols]

 1 ... Open shield machine 1a ... Side wall plate 1b ... Bottom plate 1c ... Tail part 2 ... Propulsion jack 3 ... Partition wall 3a ... Side wall 4 ... Concrete box 4a ... Left side plate 4b ... Right side plate 4c ... Upper floor plate 4d ... Lower floor plate 5 ... Buried Return 6 ... Grout material 7 ... Height adjustment material 8 ... Push angle 9 ... Excavator 10 ... Substrate 11 ... Hinge 12 ... Frame 13 ... Hydraulic cylinder 14 ... Slope 15 ... Waterless channel

Claims (3)

[Claims] 1. A shield machine comprising left and right side wall plates and a bottom plate connected to the side wall plates, the front face, the rear face and the upper face of which are open, and the tip ends of the side wall plate and the bottom plate are formed as blades. A bulkhead is installed in the center, and the steps of excavating and discharging earth and sand in front of the front or top opening of the open shield machine, in which the propulsion jacks are arranged rearward of the bulkhead and arranged side by side, and the propulsion jack is extended. 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 construction method in which concrete boxes are sequentially buried in a vertical line, the open shield machine shall be able to tilt the bulkhead forward, and during normal construction this bulkhead is When the open shield machine is standing upright and there is running water from the front, the partition walls are tilted to form a gutter with the left and right side wall plates and the partition walls, and the running water is sent through the open shield machine and sent to the rear. Open shield construction method. 2. A shield machine comprising left and right side wall plates and a bottom plate connected to the side wall plates, the front face, the rear face and the top face of which are opened, and the tip ends of the side wall plate and the bottom plate are formed as blades. In an open shield machine in which a partition wall is provided in the center, and propulsion jacks are arranged rearward of this partition wall in a vertical direction, the partition wall is hinged at the bottom, and is tiltable forward. Open shield machine. 3. The open shield machine according to claim 2, wherein the partition wall is suspended by a hydraulic cylinder.