JPH09105294A - Construction method for underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the breakage of a concrete block and dispense with the labor for rearranging a pressure receiving member by fixing the pressure receiving member to the front end face of the top concrete block. SOLUTION: A collar section having a skirt-like shape backward is integrally formed on the front end face of a top concrete block 4. The front section of the concrete block 4 is inserted into the collar section, a pressure receiving member 7 having a cushioning material between it and the front end face of the concrete block 4 is fixed to the concrete block 4 by tension materials such as screw steel rods. An open shield machine 1 is combined via the pressure receiving member 7. The process for drilling and removing the sediment in the front of the open shield machine 1, the process for extending a propulsion jack 3 and advancing the open shield machine 1 via the reaction force to the concrete block 4, and the propulsion process for advancing the concrete block 4 with a propulsion jack 21 on a starting shaft 19 side into contact with the propulsion jack 3 shrunk in the tail section of the open shield machine 1 are properly repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing underground structures such as underground passages and underground waterways.

[0002]

2. Description of the Related Art When an underground structure such as an underground passage or an underground waterway is to be constructed as a concrete structure, there are an open-cutting method, a shield method, an open shield method, and the like.

[0003] Among them, the open shield method is rich in rationality utilizing the advantages of the open cutting method (open method) for excavating from the ground and the shield method for excavating at the tip of the shield machine without affecting the ground at all. It is a construction method.

First, the open shield method will be described. As shown in FIGS. 6 and 7, reference numeral 1 denotes an open shield machine, which comprises left and right side walls 1a as main constituent members and a bottom plate and a beam member therebetween. The front surface, the rear surface, and the upper surface are connected to form an opening, the front end is formed as a cutting edge 2, and a plurality of propulsion jacks 3 are arranged vertically rearward near the center or near the rear end of the side wall plate 1a. A slidable movable side plate 1b is provided at the tip of the side wall plate 1a.

[0005] In the drawing, reference numeral 7 denotes a pressure-receiving member which is appropriately suspended from above at the rear end of the propulsion jack 3, and is formed of a frame made of box steel or die steel. In the figure, reference numeral 8 denotes a partition wall which partitions a front excavation portion and a rear portion in the open shield machine 1.

[0006] The open shield method is carried out between a starting pit and a reaching pit. Although not shown, the open shield machine is assembled in the start pit, the ground in front of the start pit is excavated by a shovel type excavator 6 installed on the ground, and the propulsion jack 3 of the open shield machine 1 is extended to start. The open shield machine 1 was advanced by applying a reaction force to the reaction wall in the mine, and the first concrete box 4 forming the underground structure was suspended from above and shrunk in the tail portion of the open shield machine 1. Set behind the propulsion jack 3. A strut is arranged between the propulsion jack 3 and the reaction wall to adjust the distance as appropriate. In addition, the starting pit is constituted by a retaining wall such as a sheet pile. In order to start the open shield machine 1, a part of the retaining wall is mirror-cut. Some improvements have been made.

Next, similarly, the excavator 6 excavates earth and sand from the front or upper surface of the open shield machine 1 and discharges the earth to advance the open shield machine 1, and moves the open shield machine 1 in front of the first concrete box 4. The second concrete box 4 is suspended in the tail of the open shield machine 1. Less than,
The same excavation and the setting process of the concrete box 4 are repeated, and the concrete boxes 4 are buried one by one in the ground in order,
Concrete box 4 at the rear using a dozer excavator
Although the backfilling 5 is performed on the upper part and the oscillating roller or the like is used, although illustration is omitted, when the open shield machine 1 reaches the reaching pit, it is disassembled and removed to complete the construction.

[0008]

As described above, in the open shield method, the concrete box 4 is suspended in the tail portion of the advancing open shield machine 1 and connected to the head of the existing concrete box 4. And
The hanging work place also moves as the construction progresses. The hanging operation of the concrete box 4 is performed by a heavy-duty heavy machine such as a crawler crane, but it may be difficult to secure the installation place in a narrow city area.

In particular, in the place where the open shield machine 1 is located, excavation work is also performed by the shovel type excavator 6, so that it is more complicated to carry in a large heavy machine such as a crawler crane immediately after that. Space is often not available.

An object of the present invention is to solve the disadvantages of the prior art and to utilize the advantages of the open shield method, which makes excavation and earth removal easier and quicker than the shield method, while using a large lifting machine such as a crawler crane. It is an object of the present invention to provide a method of constructing an underground structure which can be safely constructed without taking up space in an urban area or the like by eliminating the need for mobile use.

[0011]

In order to achieve the above-mentioned object, the present invention is directed to a method in which a concrete box is pushed in a tandem by a propulsion jack from a starting pit, and a steel frame is provided on the front end face of the leading concrete box. A skirt-shaped collar part is integrally formed toward the rear, and the front part of the concrete box is fitted into this collar part, and a cushioning material such as neoprene rubber is provided between the concrete box and the front end face. The pressure receiving member with the interposition is fixed to the concrete box with a tension member such as a screw steel bar, and further provided in front of it,
Combining an open shield machine with openings on the rear and top surfaces, and a plurality of propulsion jacks arranged inside the side wall plate facing rearward and vertically, excavating and discharging earth and sand in front of this open shield machine, and an open shield A process in which the propulsion jack in the machine is extended to abut against the pressure receiving member, and the concrete box is reacted to advance the open shield machine;
A propulsion process in which the propulsion jack pushes the concrete box and the pressure receiving member provided in the first concrete box from the start pit side until it comes into contact with the contracted propulsion jack in the tail of the open shield machine. The gist of the invention is to appropriately repeat the suspension step.

According to the present invention, the concrete box to be newly connected to the starting pit is hung and connected to the end of the existing column, which is pushed by the propulsion jack. Large lifts such as crawler cranes need only be installed near the starting pit, and can be safely constructed without taking up space in urban areas. In addition, the top of the concrete box can be excavated from the ground in the same manner as the conventional open shield method, and excavation and earth removal can be performed easily and quickly.

Further, in addition to the above-mentioned operation, a pressure receiving member made of a steel frame is fixedly provided on the front end face of the leading concrete box, thereby receiving a propulsion reaction force of the propulsion jack of the open shield machine at this portion, The concrete box can be prevented from being damaged. Since the pressure receiving member always advances with the leading concrete box, it is not necessary to dispose the pressure receiving member individually.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a vertical sectional side view showing an embodiment of a method for constructing an underground structure of the present invention, in which the same components as those in FIGS. 6 and 7 showing the open shield construction method are given the same reference numerals.

First, the device used in the present invention will be described. The open shield machine 1 has the front, rear and upper surfaces opened as in the prior art, and the propulsion jack 3 is moved up and down inside the side wall plate 1a. Are arranged side by side.

As shown in FIGS. 2 to 5, the open shield machine 1 is provided with a movable side plate 1b which is pushed and retracted by a slide jack 9 at the tip of a side wall plate 1a. Then, the propulsion jack 3 is arranged behind the slide jack 9.

In the drawing, reference numeral 10 denotes a pressure receiving member made of a steel frame such as an H-shaped steel, which has a size similar to that of the concrete box 4, and is attached to the front end face of the leading concrete box 4 as shown in FIG. It is stacked and fixed to the concrete box 4 with a tension member 11 such as a screw steel rod penetrating therethrough. 12 in the figure is tension material
A fixing device comprising a combination of a fixing plate and a nut for fixing the end of 11. On the concrete box 4 side, a box-cut recess 13 is formed in the leading concrete box 4 or the concrete box 4 behind it. A tension material in this recess 13
The fixing holes are fixed by the fixing device 12 in the concave portions 13 by communicating the insertion holes 11.

The pressure receiving member 10 is integrally formed with a skirt-shaped collar portion 14 toward the rear. The front portion of the concrete box 4 is fitted into the collar portion 14, and the pressure receiving member 10 is in contact with the front end face of the concrete box 4. A buffer 15 made of neoprene rubber or the like was interposed between the member 10.

As shown in FIG. 3, the open shield machine 1
And the pressure receiving member 10 are connected by a rod 16 made of a PC steel rod, and the rod 16 can be pulled by a towing jack 17,
A retraction device 18 composed of a combination of the rod 16 and the traction jack 17 is provided alongside the propulsion jack 3.

Next, a method of constructing an underground structure according to the present invention will be described. The method for constructing an underground structure according to the present invention is also carried out between the starting pit and the reaching pit. The open shield machine 1 is assembled in the starting pit 19.

In this manner, the ground in front of the starting pit 19 is excavated by the backhoe type shovel type excavator 6 in the open shield machine 1, and the propulsion jack 3 of the open shield machine 1 is extended to extend the starting pit 19. The open shield machine 1 is moved forward by applying a reaction force to the reaction wall 20 inside, and the first concrete box 4 forming the underground structure is suspended from above,
It is set behind the propelled jack 3 that has been shortened in the open shield machine 1. The first concrete box 4 has the pressure-receiving member 10 attached to the front end face, and the pressure-receiving member 7 is suspended from the rear, and is disposed between the pressure-receiving member 7 and the reaction wall 20. Arranged the propulsion jack 21.

Next, similarly, the backhoe type shovel excavator 6 in the open shield machine 1 excavates and discharges the soil in front of the open shield machine 1 and extends the propulsion jack 3 to open the open shield machine 1. To reduce the propulsion jack 3.

The propulsion jack 21 is extended by the reduced amount of the propulsion jack 3 to push out the pressure receiving member 7 and the first concrete box 4. The propulsion jack 21 is contracted by the amount of the extrusion, and the second concrete box 4 is suspended and arranged in the starting pit 19 so as to be in a row behind the first concrete box 4.

Hereinafter, similarly, a step of excavating and discharging earth and sand in front of the open shield machine 1 and a step of extending the propulsion jack 3 in the open open shield machine 1 to make the concrete box 4 a reaction force to open the open shield machine 1 1 and the propulsion jack from the starting pit 1 until it abuts the contracted propulsion jack 3 in the tail of the open shield machine 1
The propulsion process of pushing the concrete box 4 at 21 and the process of hanging the concrete box 4 in the start pit 19 are appropriately repeated.

In the case of curve construction, the strokes of the left and right propulsion jacks 3 in the open shield machine 1 are differentiated, and the propulsion jacks 3 on the side opposite to the side to be bent are further extended. The propulsion jack 3 on the opposite side is extended by being dragged by the propulsion jack 3 that extends.

Therefore, the towing jack 17 of the retraction device 18
By pulling the rod 16, the forcible jack 3 is used to forcibly reduce the rod 16 so that the open shield machine 1 can reliably bend.

In addition, backfilling is performed above the concrete box 4 buried in the ground in a column, and a friction cut material such as an iron plate is arranged on the upper surface of the concrete box 4, and the backfilled soil is kept as it is. Either a method of moving only the box 4 forward or a method of disposing a friction cut material by a vertical plate between the backfill soil and the ground and moving the backfill soil together with the concrete box 4 may be selected.

Further, with regard to the extrusion of the concrete box 4 buried in the ground in a column, if the length is long, only the propulsion jack 21 in the starting pit 19 is used. The extruded parts can be dispersed.

[0029]

As described above, the method of constructing an underground structure according to the present invention utilizes the advantage of the open shield method that excavation and earth removal can be performed easily and quickly as compared with the shield method, while providing a concrete box. Since a heavy lifting machine such as a crawler crane is no longer used for hanging the vehicle, it can be safely constructed without taking up space in an urban area or the like.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional side view showing an embodiment of a method for constructing an underground structure of the present invention.

FIG. 2 is a cross-sectional plan view of the open shield machine used in the present invention.

FIG. 3 is an enlarged cross-sectional plan view of a main part of the open shield machine used in the present invention.

FIG. 4 is a cross-sectional plan view showing fixing of a pressure receiving member.

FIG. 5 is a vertical sectional side view of an open shield machine used in the present invention.

FIG. 6 is a vertical sectional side view showing a digging step of a conventional open shield method.

FIG. 7 is a vertical sectional side view showing a concrete box installation process of a conventional open shield method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a ... Side wall plate 1b ... Movable side plate 2 ... Blade port 3 ... Propulsion jack 4 ... Concrete box 5 ... Backfilling 6 ... Excavator 7 ... Pressure receiving member 8 ... Partition wall 9 ... Slide jack 10 ... Pressure receiving member 11 ... Tensioning material 12 ... Fixing device 13 ... Recess 14 ... Collar 15 ... Cushioning material 16 ... Rod 17 ... Towing jack 18 ... Retraction device 19 ... Starting pit 20 ... Reaction wall 21 ... Propulsion jack

Claims (1)

[Claims] 1. When pushing a concrete box in a vertical direction from a start pit with a propulsion jack, the front end face of the concrete box is made of a steel frame, and a skirt-shaped collar portion is integrated rearward. The front part of the concrete box is fitted into this collar part, and a pressure receiving member, such as a threaded steel rod, is formed between the front end face of the concrete box and a cushioning material such as neoprene rubber. Combined with an open shield machine that is fixedly installed on the concrete box with a tension material, and the front, rear, and top surfaces are opened in front of it, and a plurality of propulsion jacks are arranged side by side vertically inside the side wall plate. , The process of excavating and discharging earth and sand in front of this open shield machine, and extending the propelling jack inside the open shield machine to make it contact the pressure receiving member and turn the concrete box into a reaction force. A step of advancing the open shield machine, a pushing step of pushing the pressure receiving member provided on the concrete box and the leading concrete box with the jack from the starting pit side until it contacts the contracted jack in the tail portion of the open shield machine, A method for constructing an underground structure, wherein a process of suspending a concrete box in a start pit is repeated as appropriate.