JP2897666B2 - Reaction receiving structure for starting a shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reaction receiving structure for starting a shield excavator, and more particularly to a reaction receiving structure for starting a shield excavator from a shaft having a partition wall therein. .

[0002]

2. Description of the Related Art As one of tunnel construction methods for excavating and forming an underground tunnel, a shield construction method is conventionally known. According to such a shield construction method, a strong lining covering the inner peripheral surface of the tunnel with a segment or the like is used. While forming the body,
Since the tunnel excavation work is performed by a shield machine, the tunnel is excavated and formed without being affected by relatively soft ground with poor construction conditions and without affecting surrounding facilities. Therefore, it is frequently used as a tunneling method particularly for setting up urban facilities underground.

[0003] That is, various types of shield methods, such as a muddy water shield method and an earth pressure type shield method, are known, and all of these shield methods are usually formed by excavating a vertical hole from the ground surface. From the starting shaft, the shield excavator is started toward the opposite side wall surface while using one side wall surface of the shaft as a reaction wall for starting, and the face of the tunnel is cut by the shield excavating machine. The tunnel is formed by digging toward the arrival shaft while arriving.

[0004] On the other hand, according to the shield method, generally, the construction section between the starting shaft and the reaching shaft is defined as one construction section, and the shield tunnels formed for each construction section are connected via the shaft, whereby these construction sections are connected. In order to use such a shaft efficiently, a large shaft spanning multiple sections is formed at a time, and this shaft is appropriately divided, and the shield tunnel is divided into multiple sections. In some cases, it can be used simultaneously as a starting shaft or a reaching shaft.

When the shield machine is started from such a large shaft, a reaction force for starting the shield machine is obtained from the side wall surface on the opposite side of the shaft wall on the starting side. Then, since the structure for receiving the reaction force becomes large and complicated, it is conceivable to obtain the reaction force from the partition wall provided in the shaft.

[0006]

However, in order to obtain a reaction force for starting from a partition wall in a shaft, such a partition wall is generally formed by, for example, a continuous wall formed by an underground continuous wall method or a perforated wall. Although it is a solid structure in which steel piles and the like are connected in series, the back side is a hollow part and is not directly supported by the surrounding ground, so the shield excavator There is a problem in that when excavation reaction force is received at the time of starting, deformation such as bending and bending is likely to occur.

[0007] Such a continuous wall or a partition wall made of a steel pile is often used as a base member or a support member of a temporary structure such as a road surface lining or a mountain retaining member. There was a problem that the temporary structure supported and supported by the deformation may become unstable due to the deformation.

On the other hand, if two shield excavators are started simultaneously in the direction opposite to each other with the partition wall interposed therebetween, mutual excavation reaction forces are offset, and deformation such as bending and bending is caused on the partition wall. It is thought that each shield excavator can be started without causing it.However, due to differences in ground conditions, it is difficult to manage these two shield excavators so that they can advance simultaneously with the same propulsion force. Therefore, there is a possibility that the partition wall may be deformed due to the imbalance of propulsion.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. When a shield excavator is started from a shaft having a partition wall therein, the partition wall is not deformed. An object of the present invention is to provide a shield excavator starting reaction force receiving structure capable of stably starting a shield excavator by firmly supporting a propulsive force for starting.

Further, the present invention provides a shield excavator capable of simultaneously starting two shield excavators stably in a direction opposite to each other across the partition wall without causing deformation of the partition wall. An object of the present invention is to provide a reaction force receiving structure for starting a vehicle.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and its gist is to start a shield excavator for starting a shield excavator from a shaft having a partition wall therein. A reaction force receiving structure, in which the partition wall is erected at a predetermined distance from the partition wall in the starting direction of the shield machine, and the upper end and the lower end of the partition wall are supported by backing. A reaction force wall attached to the partition wall via a member, and a shield excavation from a rear portion of a portion where the backfilling support member is attached, on a rear side of the partition wall in a starting direction of the shield excavator. The excavation reaction force transmitted from the reaction wall at the start of the shield excavation machine via the backfilling support member to the shaft shaft side surface opposite to the shaft wall surface on the side where the machine starts is transmitted to the opposite side. Upper part to the side wall of the shaft For shield machine start, characterized in that it consists of a force receiving member and a lower reaction force receiving member is in the reaction force receiving structure.

Another aspect of the present invention is that the shield excavator starting reaction force receiving structure is provided to face both sides of the partition wall, and two shield excavators are provided in opposite directions. And a reaction receiving structure for starting a shield machine.

[0013]

According to the reaction receiving structure for starting a shield excavator according to the present invention, the propulsive force of the shield excavator at the time of starting is supported by the reaction wall, and the supporting force is reduced by the backing support member. And a lower reaction force receiving member and a lower reaction force extending from the back of the partition wall at the mounting portion of the back-filling support member to the shaft wall surface opposite to the shaft wall surface on which the shield machine starts. Through the receiving member, the partition wall is transmitted to the opposite shaft wall without causing bending stress, and is directly and firmly supported by the opposite shaft wall.

Further, even if the reaction wall is bent and deformed when the thrust of the shield machine is supported by the acupressure, the reaction wall is erected at a distance from the partition wall. Does not cause deformation.

If this shield excavator starting reaction receiving structure is provided opposite to each other with the partition wall interposed therebetween, the two shield excavating machines are simultaneously started in opposite directions in a stable state. Can be done.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. The reaction receiving structures 10, 10 'for starting a shield machine according to this embodiment are, for example,
As shown in FIG. 1, a vertical hole is excavated in a vertical direction from the ground surface, and a shaft 11 constructed by protecting the inner wall surface thereof is divided by a partition wall 12, and each of the divided work spaces 13 and 13 ′ is formed. Therefore, two shield excavators 14 and 14 'are provided so as to be able to simultaneously start in the direction opposite to each other with the partition wall 12 therebetween.

Here, the shaft 11 in this embodiment is:
It is constructed by various known methods, for example,
Prior to the excavation work, after forming the side wall 15 and the partition wall 12 surrounding the periphery of the shaft 11 from the ground surface by the underground continuous construction method or the like, the inside of the side wall 15 is provided with a ridge retaining member 16. While digging down one by one while digging down to the digging bottom, it is constructed by laying out the foundation members 17 and casting the bottom slab concrete 18. In addition, at the upper end opening of the shaft 11, the side wall 15 and the partition wall 12 are used as support members, and the road surface lining 1 as a temporary structure is used.
9 are provided.

Further, the shield excavator starting reaction force receiving structures 10 and 10 'of this embodiment are provided with the partition wall 12 and the shield excavator 14, 14' on the front side in the starting direction of each of the shield excavators 14, 14 '. Are erected at predetermined intervals 30, and the upper end and lower end thereof are
Reaction wall 2 attached to partition wall 12 via 0, 20 '
1, 21 'and the rear side of the partition wall 12 in the starting direction of each of the shield excavators 14, 14', from the back of the portion where the back-filling support members 20, 20 'are attached, Shaft side wall surfaces 23, 2 on the opposite side of shaft shaft side surfaces 22, 22 'on the side where shield machine 14, 14' starts.
The beam members 24, 24 'as upper reaction force receiving members and the bottom slab concrete 25, 25' as side reaction wall members which extend to 3 '. In FIG. 1, those indicated by reference numerals 26, 26 'are interposed between the shield excavators 14, 14' and the reaction walls 21, 21 ', respectively, and are shield excavators 14, 14'. This is a supporting frame for transmitting the pressing force from the shield jack to the reaction walls 21 and 21 '.

In this embodiment, two shield excavators 14, 14 'are started simultaneously in opposite directions, and two sets of reaction force receiving structures 10, 10 having exactly the same configuration. Are described on both sides of the partition wall 12, but the present invention is not limited to the embodiment of this embodiment, and two sets of reaction force receiving structures 1 are provided.
Only one of the shield excavators 14 and 14 ′ may be started using only one of the shield excavators 14 and 14 ′, and two sets of the reaction force receiving structure 10 are necessarily provided in the shaft 11. However, it may be provided alone. Therefore, in the following description, in the case where the description contents overlap, only one of the reaction force receiving structures 10, 10 'will be described.

As shown in FIGS. 2 and 3, the reaction wall 21 constituting the reaction force receiving structure 10 for starting a shield excavator according to this embodiment includes three H-shaped steel members 31 each having a flange. A set of parts arranged in parallel with the front and rear surfaces as a set is formed as a set, and these are set up and arranged in parallel at predetermined intervals along the three sets of partition walls 12 (see FIG. 2). The size, number, spacing, and the like of the H-beams constituting the reaction wall 21 are appropriately designed in consideration of the propulsion reaction force when the shield machine is started.

At the upper end and lower end of the reaction wall 21, between the rear flange and the partition wall 12,
The backfill concrete as the backfill support member 20 is filled and cast and solidified, so that the reaction force wall 21 is attached to the partition wall 12 and the backfill support member located at the upper end and the lower end. A space 30 is formed and held between the reaction wall 21 and the partition wall 12 in a portion sandwiched by the upper and lower portions 20 (see FIG. 3).

The reaction force wall 21 has a lower end portion of an H-shaped steel 31 constituting the reaction force wall 21 disposed inside a rectangular hole 32 formed in the bottom slab concrete 18 adjacent to the partition wall 12. The lower end of the H-shaped steel 31 inserted into the rectangular hole 32 while being erected on the bottom surface of the rectangular hole 32 has a back surface via backfill concrete as the backfill support member 20 at the lower end. The partition wall 12 is in close contact with the partition wall 12, and the front surface thereof is in close contact with the inner side surface of the rectangular hole 32 via the filling steel 33.

In FIG. 2 and FIG. 3, what is indicated by reference numeral 34 is a reaction wall which efficiently transmits the pressing force from the shield jack when the shield machine 14 starts moving, which is transmitted through the supporting frame 26. In order to transmit to the support 21, at a height corresponding to each beam member configuring the bearing support base 26,
This is a support stand erection that is attached to the reaction wall 21 via a bracket 35 so as to be interposed between the support stand 26 and the reaction wall 21. In addition, what is indicated by reference numeral 36 in FIG. 3 is a mounting stand used when the H-shaped steel constituting the reaction wall 21 is erected.

Further, as shown in FIGS. 3 and 4, a beam member 24 'as an upper reaction force receiving member constituting the shield reaction machine starting reaction force receiving structure 10' of this embodiment is provided at the back of the upper end portion. In the portion where the support member 20 ′ is attached, the partition wall 12 is extended between the partition wall ridge 37 attached to the reaction wall 21 and the side wall ridge 38 attached to the side wall 15, and the partition wall 12 is extended. Work space 13 'on the other side of the sandwich
From the reaction wall 21 ′, the backing support member 20 ′ and the partition wall 12, and the backing support member 2 in the working space 13.
The support reaction force transmitted via the reaction wall 0, the reaction wall 21, and the partition wall bellows 37 is transmitted to the shaft wall surface 23 'on the opposite side to the starting direction of the shield machine 14'.

Further, the bottom wall concrete 25 ′ as a lower reaction force receiving member constituting the reaction force receiving structure 10 ′ for starting the shield machine of this embodiment has a partition wall 1.
Reaction wall 2 provided in the work space 13 'on the opposite side across
1 ′, the back-filling support member 20 ′ and the partition wall 12, and the back-filling support member 20, the reaction wall 21 in the working space 13,
And the supporting reaction force transmitted via the filling steel material 33 to the shaft wall 2 on the opposite side to the starting direction of the shield machine 14 '.
3 ′ (see FIG. 1).

Therefore, according to the shield excavator starting reaction force receiving structures 10 and 10 ′ of this embodiment, the propulsive force of each shield excavator 14 and 14 ′ at the time of starting is supported by the reaction force wall 21. This support force is applied to the shield excavators 14 and 14 ′ via the backing support members 20 and 20 ′, and from the back of the partition wall 12 at the attachment site of the backfilling support members 20 and 20 ′. Shaft side walls 23, 2 on the opposite side to the shaft side wall surfaces 22, 22 'on the
It is transmitted via upper reaction force receiving members 24, 24 'and lower reaction force receiving members 25, 25' extending to 3 ', and is directly and firmly supported by the shaft shaft side walls 23, 23' on the opposite side. Since the reaction wall 21 is erected at a distance from the partition wall 12, a large bending stress is not generated on the partition wall 12. That is, the deformation of the partition wall 12 is avoided, thereby preventing the temporary structures such as the road surface lining 19 and the shore retaining member 16 from becoming unstable, and stabilizing the shield excavators 14 and 14 ′. You can start.

In this embodiment, two sets of reaction receiving structures 10, 10 'are provided on both sides of the partition wall 12, so that the two shield excavators 14, 14' are opposed to each other. Although the case of starting simultaneously has been described, the reaction force receiving structures 10, 10 'of the present invention can also be used in the case where only one shield excavator is started and provided alone. In this case, the partition wall belly 3
7, 37 'can also be used by directly attaching it to the partition wall 12.

[0028]

As described in detail above, the reaction receiving structure for starting a shield machine according to the present invention has a predetermined distance from the partition wall in front of the shield wall in the starting direction of the shield machine. And the upper end and lower end of the reaction wall are attached to the partition wall via a backing support member. From the back of the part where the support member is attached,
The shield excavator extends to the shaft shaft side surface on the side opposite to the shaft shaft surface on which the shield excavator starts, and excavation reaction force transmitted from the reaction wall via the backfilling support member from the reaction wall at the start of the shield excavator on the opposite side Since it consists of an upper reaction force receiving member and a lower reaction force receiving member to be transmitted to the shaft side wall surface, when starting the shield machine from a shaft having a partition wall inside, the starting wall is not deformed without causing deformation of the partition wall. And the shield excavator can be started stably.

Further, if the reaction force receiving structure for starting the shield excavator is provided opposite to each other with the partition wall interposed therebetween, the two shield excavators can simultaneously start in opposite directions in a stable state. Can be done.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing the configuration of a shield excavator starting reaction force receiving structure according to an embodiment of the present invention.

FIG. 2 is a front view showing a mounting state of a reaction wall.

FIG. 3 is a side view showing a mounting state of a reaction wall and upper and lower reaction force receiving members.

FIG. 4 is a plan view showing a mounting state of a beam member as an upper reaction force receiving member.

[Explanation of symbols]

10, 10 'Shield excavator starting reaction force receiving structure 11 Vertical shaft 12 Partition wall 14, 14' Shield excavator 15 Side wall 16 Mountain retaining member 19 Road surface lining 20, 20 'Backing support member 21, 21' Reaction force Wall 22, 22 'Vertical shaft side wall 23, 23' Vertical shaft side wall 24, 24 'Beam member (upper reaction receiving member) 25, 25' Bottom concrete between side wall partition walls (lower reaction receiving member)

Claims (2)

(57) [Claims] 1. A reaction force receiving structure for starting a shield machine from a shaft having a partition wall therein, the reaction force receiving structure for starting a shield machine. A reaction wall which is arranged upright at a predetermined distance from the wall and whose upper end and lower end are attached to the partition via a back-filling support member, and a shield excavator for the partition On the rear side in the starting direction of the shield excavator, the backing support member is extended from the back side of the portion attached thereto to the shaft wall side opposite to the shaft wall on the side where the shield machine starts. An upper reaction force receiving member and a lower reaction force receiving member for transmitting an excavation reaction force transmitted from the reaction wall via the backfilling support member to the opposite shaft wall when the excavator starts. To start a shield excavator Force receiving structure. 2. The reaction receiving structure for starting a shield machine according to claim 1 is provided to face both sides of the partition wall, and two shield machines can be simultaneously operated in opposite directions. A reaction receiving structure for starting a shield excavator, which can be started.