JP6989483B2 - Open shield machine removal method - Google Patents

Description

The present invention relates to a method for removing an open shield machine in an open shield method for constructing underground structures such as water and sewage systems and underground passages in an urban area.

The open shield method is a highly rational construction method that makes the best use of the advantages of the open cut method and the shield method. It is possible to carry out safe and economical construction while minimizing the impact on the surrounding environment at construction sites where construction is difficult or costly with conventional construction methods.

Explaining this open shield method first, as shown in FIGS. 18 to 20, reference numeral 1 in the drawing is an open shield machine, in which the left and right side wall plates 1a are used as the main constituent members, and the bottom plates and beam members are connected between them. The front surface, the rear surface, and the upper surface are opened, the tip is formed as a blade edge 2, and a plurality of propulsion jacks 3 are arranged vertically side by side toward the rear near the center or the rear end of the side wall plate 1a. A slidable movable side wall plate 1b was provided at the tip of the side wall plate 1a.

In the figure, 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 composed of a frame made of box steel or structural steel. Further, 8 in the figure is a partition wall for partitioning the front excavated portion and the rear portion in the open shield machine 1.

The open shield method is constructed between the starting shaft 9 and the reaching shaft. Although not shown, the open shield machine 1 is assembled in the starting shaft 9, the ground in front of the starting shaft 9 is excavated by a shovel type excavator 6 installed on the ground, and the propulsion jack 3 of the open shield machine 1 is excavated. The open shield machine 1 is advanced by extending and taking reaction force against the reaction force wall 10 in the starting shaft 9, and the first concrete box 4 forming the underground structure is suspended from above to be an open shield machine. Set behind the retracted propulsion jack 3 in the tail of 1.

A strut is arranged between the propulsion jack 3 and the reaction force wall 10, and the distance is adjusted as appropriate.

Further, the starting shaft 9 is composed of an earth retaining sheet pile 11 such as a sheet pile, a mirror earth retaining sheet pile 11a, and a support work 12, and in order to start the open shield machine 1, the mirror earth retaining sheet pile 11a is partially cut into a mirror, but it is necessary. Depending on the situation, the ground may be improved in the front part of the starting shaft 9 by injecting a chemical solution or the like.

Next, in the same manner, the excavator 6 excavates and discharges earth and sand from the front surface or the upper surface of the open shield machine 1 to advance the open shield machine 1, and the second concrete box 4 is placed in front of the first concrete box 4. The concrete box 4 is hung in the tail portion of the open shield machine 1.

When the concrete box 4 is suspended in the tail portion of the open shield machine 1, a height adjusting material such as a concrete block is arranged under the concrete box 4, and the concrete box 4 is placed in the tail portion. Fill the left, right and bottom voids with grout material.

Hereinafter, the same excavation and setting process of the concrete box 4 are repeated, the concrete boxes 4 are sequentially buried in the ground in columns, the concrete boxes 4 are fastened to each other with the PC steel rod 15, and further, the concrete boxes 4 are fastened to each other. The plastic backfill injection material 44 is injected to the side of 4 using the grout hole formed in the concrete box 4.

The backfill soil 5 is applied to the concrete box 4 at the rear using a bulldozer, excavator, etc., and it is hardened with a vibrating roller or the like.・ Remove and complete the construction.

As described above, the starting shaft 9 has a girder support type earth retaining structure, and is composed of an earth retaining sheet pile 11 such as a sheet pile, a mirror earth retaining sheet pile 11a, and a support work 12, and this is used to start the open shield machine 1. It is necessary to partially cut the mirror soil sheet pile 11a into a mirror.

In addition, it may be necessary to improve the ground at the front portion and the wellhead of the starting shaft 9 by injecting a chemical solution or the like.

Although the reaching shaft is not shown, it is composed of earth retaining sheet piles such as sheet piles, mirror earth retaining sheet piles, and support work similar to the starting shaft 9, and this mirror earth retaining sheet pile is used to allow the open shield machine 1 to reach the inside of the reaching shaft. Cut a part of the mirror.

Furthermore, the reaching shaft is also a mirror-cutting part of the mirror soil retaining sheet, and the open shield machine 1 is dug from the reaching shaft side, and a lining plate is placed on top to prevent earth and sand from entering. Give.

In the following patent documents, in the reaching shaft, there is no need for mirror cutting of the reaching shaft when the open shield machine arrives, and there is no need to dig for the shield machine or remove the upper part of the shield machine before entering the shaft. Therefore, it was proposed as one that can reduce the number of processes.
Japanese Patent No. 5960787

In this Patent Document 1, a wellhead earth retaining wall is installed at the end of the ground improvement part corresponding to the upper part of the shield machine, the upper part in the reaching shaft is excavated, and the shield is excavated and the soil is lost on the outside. The upper member of the machine was removed, a support was erected inside the upper part of the excavated shaft, the middle part of the shaft was excavated, the middle part of the shield machine was removed, and the wellhead was retained to the middle part. , The lower part of the reaching shaft was excavated, the wellhead was retained to the lower part, and the lower part of the shield machine was removed.

According to Patent Document 1, since the reaching shaft is flat U-shaped and the reaching direction of the shield machine is opened, the reaching direction of the open shield machine is opened and it is not necessary to perform mirror cutting, and as a result, the reaching shaft is opened. You can enter the shield machine without having to dig against the open shield machine. At the time of this entry, the ground has been improved inside the opening, so the entry can be done without damaging the ground.

In addition, when entering the open shield machine, the reaching shaft is at the stage where steel sheet piles are placed, and there is earth and sand on the outside of the open shield machine. Since there is no raising, there is no need to remove the upper part of the shield machine before entering the mine.

After entering the mine, after entering the mine, a wellhead earth retaining wall is installed at the end of the ground improvement part, and excavation is carried out in stages in the upper, middle, and lower stages, and a support is installed each time, and the upper and middle stages are installed. , The open shield machine can be disassembled and removed step by step in the lower row.

In the method of Patent Document 1, the reaching shaft is at the stage where the steel sheet pile is placed and the inside is excavated later, so that it takes time, and the upper and middle stages are sequentially arranged. It is like completing the shaft after reaching the open shield machine, because the shaft is excavated step by step from the lower stage and the support work is installed each time.

Further, in order to normally reach and remove the open shield machine without taking the method as in Patent Document 1, it is necessary to examine the shaft dimensions for removing the open shield machine.

In that case, it is necessary to have a shaft dimension in consideration of reaching the front portion and the jack / tail portion in two parts, and the open shield machine cannot be removed if the predetermined shaft dimension is not secured due to the site conditions.

An object of the present invention is to solve the above-mentioned inconvenience of the conventional example, and to provide a method for removing an open shield machine capable of shortening the length of the reaching shaft when the open shield machine reaches the constructed shaft and is removed. To do.

In order to achieve the above object, the present invention according to claim 1 is an open shield machine which is a shield machine having an open front surface, a rear surface, and an upper surface. The jack part and the box body suspension part can be separated from each other, and in the reaching shaft, first, the front part is propelled by using a shield jack to propel the concrete box body as a reaction force, and then the jack part is also removed. , The concrete box is propelled as a reaction force by the shield jack and removed, and the block steel material which is a temporary reaction force member and the temporary hydraulic jack are provided at the bottom of the hanging part of the box body, and the temporary reaction force member is open. It is attached using the bonding bolt holes of the shield machine, and the box hanging part is propelled by a temporary reaction force member installed at the bottom of the box hanging part and a propulsion facility using a temporary hydraulic jack. The purpose is to bring it into the reaching shaft and remove it.

The present invention according to claim 2 is an open shield machine in which the front surface, the rear surface, and the upper surface are opened. It can be separated from the lower part, and the front part is first propelled by using a shield jack to propel the concrete box body as a reaction force to remove it, and then the jack part is also made to be a concrete box by a shield jack. The body is propelled as a reaction force and removed, and the box suspension part is a first temporary reaction force member made of block steel provided at the bottom of the reaching shaft, and an open shield at the bottom of the box suspension part. Towing by a towing hydraulic jack provided on the second temporary reaction force member made of block steel material attached using the joining bolt hole of the machine and a towing facility by the towing member connecting the first temporary reaction force member and the towing hydraulic jack. The purpose is to bring it into the reaching shaft and remove it.

According to the first and second aspects of the present invention, the open shield machine is equipped with a hydraulic jack, a front portion for direction correction and excavation, and a jack portion and a box body provided with a shield jack for pushing the box body. It has a two-part structure with a tail part that has a box hanging part, which is a space for laying, but this is divided into a jack part with a shield jack and a box hanging part. Each can be separated, and the hanging part of the box, which is not equipped with a hydraulic jack for movement, is provided with a temporary reaction force member so that the tail part can move independently by receiving reaction force from the additional hydraulic jack. Therefore, as shown in FIG. 17, the reachable shaft length can be shortened as compared with the conventional removal method in which the front part must be inserted and removed, and then the jack and tail parts must be integrally inserted and removed. ..

In addition, when propelled by propulsion equipment and carried into the reaching shaft, a temporary reaction force part is installed at the bottom of the box body hanging part to easily and surely not have a hydraulic jack. Can be reached and removed.

According to the second aspect of the present invention, when towing with a towing facility and carrying it into the reaching shaft, it is easy to install a temporary reaction force portion at the bottom of the reaching shaft and the bottom of the box hanging portion. It is possible to reliably reach and remove the hanging part of the box body that is not equipped with a hydraulic jack.

Furthermore, although the open shield machine has a three-part structure, it can be separated by joining with bolts, but by attaching a temporary reaction force member using this joining bolt hole, it can be easily attached and removed without processing. Can be done.

As described above, the method for removing the open shield machine of the present invention can shorten the length of the reaching shaft when the open shield machine reaches the constructed shaft and is removed.

It is a side view of the front part entrance which shows 1 Embodiment of the removal method of the open shield machine of this invention. It is a top view of the front part entrance which shows one Embodiment of the removal method of the open shield machine of this invention. It is a side view of the jack part entrance which shows one Embodiment of the removal method of the open shield machine of this invention. It is a top view of the jack part entrance which shows one Embodiment of the removal method of the open shield machine of this invention. It is a side view of the jack part removal which shows one Embodiment of the removal method of the open shield machine of this invention. It is a top view of the jack part removal which shows one Embodiment of the removal method of the open shield machine of this invention. It is a side view of the box body suspension part propulsion which shows one Embodiment of the removal method of the open shield machine of this invention. It is a top view of the box body suspension part propulsion which shows one Embodiment of the removal method of the open shield machine of this invention. It is a side view of the box body suspension part towing which shows one Embodiment of the removal method of the open shield machine of this invention. It is a top view of the box body suspension part towing which shows one Embodiment of the removal method of the open shield machine of this invention. It is a side view of the propulsion equipment. It is sectional drawing of the propulsion equipment. It is a top view of the propulsion equipment. It is a side view of the towing equipment. It is sectional drawing of the towing equipment. It is a top view of the towing equipment. It is explanatory drawing which shows the comparison between the prior art example and this invention. It is a vertical sectional side view which shows the excavation process of an open shield method. It is a vertical sectional side view which shows the concrete box body installation process of an open shield method. It is a perspective view which shows the outline of the open shield method.

Hereinafter, embodiments of the present invention will be described in detail with respect to the drawings. FIG. 1 is a side view of a front tunneling method showing one embodiment of the method for removing an open shield machine of the present invention, FIG. 2 is a plan view of the same as above, FIG. 3 is a side view of a jack tunnel of the same as above, and FIG. FIGS. 5 and 5 are side views of the same as above for removing the jack portion, and FIG. 6 is a plan view of the same as above, and the same components as those of FIGS. 18 to 20 showing the outline of the open shield tunneling method are designated by the same reference numerals.

The open shield method is as described above, and the propulsion jacks are arranged inside the left and right side wall plates, and the earth and sand in front of the front or top opening of the open shield machine 1 with the front, rear and top surfaces opened are excavated and discharged. The process of extending the propulsion jack and using the concrete box 4 as a reaction force to move the open shield machine 1 forward, and the process of advancing the open shield machine 1 and the new concrete box 4 behind the propulsion jack shrunk in the tail of the open shield machine 1. The concrete box 4 is sequentially buried in a column by repeating the installation step of suspending the concrete box from above and joining it to the existing concrete box.

The open shield machine 1 divides the machine body into a plurality of parts in the front-rear direction, the front end of the rear body as the tail part 19 is fitted into the rear end of the front body as the front part 18, and the open shield machine 1 is bent at the mutual fitting part. A portion was formed to allow bending.

The front portion 18 is mainly used for excavation, and the front end and the upper surface are open surfaces.

The blade edge 2 at the front end of the front portion 18 is a movable side wall plate 1b that slides with the slide jack 16, and is a movable split blade edge. On the other hand, the tail portion 19 installs a concrete box 4, has a bottom plate 5, and has a propulsion jack (shield jack) 14 facing rearward in the front part of the aircraft, and is moved up and down again. It is arranged in multiple stages.

In the present invention, the tail portion 19 can be separated into a jack portion 20 having a shield jack 14 and a box body hanging portion 21, respectively.

As a result, the open shield machine 1 can be separated into three parts, the front part 18, the jack part 20, and the hanging part 21, and the mutual connection is made by fastening with bolts.

In FIG. 1, reference numeral 17 in the figure is a reaching shaft formed by placing a steel sheet pile. Further, reference numeral 7 is a pressure receiving member (pushing angle).

As shown in FIGS. 1 and 2, first, the front portion 18 is propelled to the reaching shaft 17 by a shield jack 14 with the concrete box 4 as a reaction force.

As shown in FIGS. 3 and 4, the front portion 18 is completely inserted into the reaching shaft 17, and the front portion 18 is removed. Promote.

With the front portion 18 completely inserted into the shaft 17 reached by the jack portion 20, this is removed as shown in FIGS. 5 and 6, leaving only the box hanging portion 21.

As shown in FIGS. 7 and 8, a block steel material 22 which is a temporary reaction force member and a temporary hydraulic jack 23 are provided at the bottom of the box body suspension portion 21 as propulsion equipment.

Although the details of this propulsion equipment are shown in FIGS. 11 to 13, the block steel material 22 as the temporary reaction force member utilizes the joint bolt hole 25 of the jack portion 20 of the open shield machine 1 and the box body suspension portion 21. Can be attached.

Further, the tip of the rod of the temporary hydraulic jack 23 is assumed to be able to withstand an angle change as a hinge head 23a due to a spherical connection.

Struts 24 are appropriately arranged in front of the pressure receiving member (pushing angle) 7, and the temporary hydraulic jack 23 is extended to use the concrete box 4 as a reaction force to push the box hanging portion 21 into the reaching shaft 17.

With the box body suspension portion 21 completely in the reaching shaft 17, it is removed.

9 and 10 show another embodiment, in which a towing facility is used instead of the propulsion facility, and this towing facility is a block steel material as a first temporary reaction force member provided at the bottom of the reaching shaft 17. 26, a block steel material 27 as a second temporary reaction force member installed at the bottom of the box body suspension portion 21, a traction hydraulic jack 28 installed on the block steel material 27, and the first temporary reaction force member. It is based on the towing member 29 that connects the block steel material 26 and the towing hydraulic jack 28.

Although the details of this towing equipment are shown in FIGS. 14 to 16, the block steel material 22 as a temporary reaction force member utilizes the joint bolt hole 25 of the jack portion 20 of the open shield machine 1 and the box body suspension portion 21. Can be attached.

Further, the towing hydraulic jack 28 is a center hole jack, and the towing member 29 is a PC steel wire or a steel material, and is locked by a wedge-shaped fixing tool 30.

The towing hydraulic jack 28 is extended, and the box steel suspension portion 21 is towed into the reaching shaft 17 by using the block steel material 26 as a reaction force. The fixing tool 30 can move its position with respect to the towing member 29, and towing is performed by changing the fixing position according to the expansion and contraction of the towing hydraulic jack 28.

With the box body suspension portion 21 completely in the reaching shaft 17, it is removed.

1 ... Open shield machine 1a ... Side wall plate 1b ... Movable side wall plate 2 ... Blade edge 3 ... Propulsion jack 4 ... Concrete box 5 ... Backfill soil 6 ... Excavator 7 ... Pressure receiving member 8 ... Bulk partition 9 ... Starting shaft 10 ... Anti Power wall 11 ... Earth retaining sheet pile 11a ... Mirror earth retaining sheet pile 12 ... Support work 14 ... Propulsion jack (shield jack)
15 ... PC steel rod 16 ... Slide jack 17 ... Reaching shaft 18 ... Front part 19 ... Tail part 20 ... Jack part 21 ... Box hanging part 22 ... Block steel 23 ... Temporary hydraulic jack 23a ... Hinge head 24 ... Strut 25 ... Bolt holes for joining 26 ... Block steel material 27 ... Block steel material 28 ... Towing hydraulic jack 29 ... Towing member 30 ... Fixing tool 31 ... Middle folding jack 44 ... Plastic backfill injection material

Claims (2)

The open shield machine, which is a shield machine with open front, rear and upper surfaces, allows the machine to be separated into the front part and the tail part, and the tail part into the jack part with the shield jack and the box hanging part. At the reaching shaft, first, the front part is propelled by using a shield jack to make the concrete box a reaction force and removed, and then the jack part is also propelled by using a shield jack to make the concrete box a reaction force. This is removed , a block steel material that is a temporary reaction force member and a temporary hydraulic jack are provided at the bottom of the hanging part of the box, and the temporary reaction force member is attached using the joining bolt hole of the open shield machine. The box body suspension part is characterized by being propelled by a temporary reaction force member installed at the bottom of the box body suspension part and a propulsion facility using a temporary hydraulic jack, carried into the reaching shaft, and removed. How to remove the open shield machine. The open shield machine, which is a shield machine with open front, rear and upper surfaces, allows the machine to be separated into the front part and the tail part, and the tail part into the jack part with the shield jack and the box hanging part. At the reaching shaft, first, the front part is propelled by using a shield jack to make the concrete box a reaction force and removed, and then the jack part is also propelled by using a shield jack to make the concrete box a reaction force. This was removed, and the box suspension part used the first temporary reaction force member made of block steel provided at the bottom of the reaching shaft, and the joint bolt hole of the open shield machine at the bottom of the box suspension part. It is towed and carried into the reaching shaft by a towing hydraulic jack provided on the second temporary reaction force member made of block steel to be attached and a towing facility using a towing member connecting the first temporary reaction force member and the towing hydraulic jack. A method of removing an open shield machine, which is characterized by removing the hydraulic pressure.

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