JPH10153085A - Start port and arrival port structure for shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily increase the cutting capability of a shield machine by facilitating the biting of a cutter bit or preceding bit into a cutting surface when performing a start port work and an arrival port work while directly cutting the wall surfaces of a start base and an arrival base by a shield machine. SOLUTION: The start port and arrival port structures 10 of a shield machine are provided on the wall body of the start port and arrival port of a start base and an arrival base for a shield machine. In this case, they are provided on a concrete wall 14 capable of cutting by the cutter face of the shield machine and dispersedly in the concrete wall 14 so as to disappear spotted weak points 14 on the cutting surface of the concrete wall 14. Also they are formed by multiple box drawers 16 formed by burying a foaming styrene.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a launching or reaching port structure of a shield excavator, and more particularly, to a shield excavator while directly cutting a wall of a starting base or a reaching base with a cutter face of the shield excavator. The present invention relates to a starting port or reaching port structure of a shield excavator employed in a method of starting or reaching.

[0002]

2. Description of the Related Art For example, a shield construction method is known as one of tunnel construction methods in an urban area. This shield method is mainly used as a tunnel method for grounds with lots of groundwater or soft ground. The shield face is cut by the cutter face at the tip of the shield machine and the outer shell called the skin plate. Inside the tunnel, a ring-shaped tunnel lining body composed of segments is assembled, and a reaction force is obtained from the assembled tunnel lining body to push the shield machine forward to protect the inner wall surface of the excavated tunnel. The excavation work is performed while doing this.

[0003] According to such a shield construction method, a shaft is generally provided on a planned route of a tunnel, and a shaft is provided at a starting base or at an arrival point in order to smoothly perform excavation work with a shield excavator at a predetermined depth. As a base, the excavation work is performed while starting or reaching the shield excavator at a predetermined depth.

That is, when the shield excavator is started from the starting base or the shield excavator reaches the reaching base, an opening is provided in the side wall of the shaft, and the opening is used as the starting orifice and the opening is used as the starting orifice. This is done by pushing the shield machine forward into the ground or from the ground to the shaft.

Further, according to such a start-up work or an arrival work, it is necessary to carry out ground improvement in advance as a protective work for protecting the ground around the start entrance and the arrival entrance before opening the opening. In addition, the opening work of these wellheads is generally performed by a worker hanging a wall.

On the other hand, protective work at each wellhead due to ground improvement requires a great deal of work due to, for example, restrictions due to traffic regulations and the like, and a great deal of labor is required for the wall hanging work by the worker. Therefore, in order to omit or simplify such work to enable smoother starting or reaching work, in recent years, the starting or approaching of the starting base or the reaching base while cutting directly the wall surface of the starting base or the reaching base has been performed. The construction method of performing the reaching work is adopted.

[0007] That is, according to such a construction method, the wall of the starting base or the arrival port of the arrival base or the portion of the arrival base is removed while removing the steel material such as a reinforcing bar which is an obstacle to the cutting work. Mortar or mortar, etc., so that it can be cut, and when starting or reaching work, such a cuttable solidified wall is cut directly by the cutter face at the tip of the shield machine, The excavator will move forward.

[0008]

However, according to the conventional method of starting and reaching the shield excavator while directly cutting the wall constituting the above-mentioned starting base and reaching base, the starting opening is required. Since the cuttable wall body that constitutes the part and the arrival port part is made of a solidified material with considerable strength or hardness such as concrete and mortar, it is cut with a cutter bit attached to the cutter face and a leading bit. In this case, there is a problem that it is difficult to improve the cutting performance by the cutter face because the bite amount is reduced.

In particular, in order to reduce the wall thickness of the walls constituting the starting base and the arrival base, for example, in order to make the walls at the starting opening and the arrival part high in strength,
Such a wall, for example, while using limestone as a coarse aggregate, may be formed of reinforced concrete using carbon fiber reinforced resin as a tensile reinforcement,
According to such a high-strength concrete wall, it is not only more difficult to improve the machinability, but also the cutting surface is polished like a mirror, and the bit is worn or dropped, and the like. However, since the oil temperature of the cutter may be extremely increased and the cutting operation may be stopped, there is a problem that much time is required for the cutting operation.

In view of the above, the present invention has been made in view of such a conventional problem. A shield excavator is used to directly cut a wall constituting a starting base or a reaching base while starting or reaching the starting base. To provide a starting port or reaching port structure of a shield excavator that can easily cut into a cutting surface of a cutter bit or a preceding bit when performing the operation and easily improve the machinability by a shield excavator. It is the purpose.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and the gist of the invention is to directly cut a wall of a starting base or a reaching base by a cutter face of a shield machine. A launch port or a launch port structure provided in a launch port or a launch port wall of the launch base or the reach base, which is adopted in a construction method of launching or reaching the shield excavator, and concrete cut by the cutter face. Solidified wall made of a solidified material such as mortar or mortar, and a large number of boxless holes that are spotted inside the solidified wall, thereby exposing spot-like weak spots on the cut surface of the solidified wall. A launch port or an arrival port structure of a shield machine.

Further, in the launching port or reaching port structure of the shield machine according to the present invention, the solidified wall cut by the cutter face uses limestone as coarse aggregate and carbon fiber reinforced resin as tensile reinforcing material. It is preferable to include the used reinforced concrete.

Further, in the launching port or the reaching port structure of the shield machine according to the present invention, a large number of box openings provided to be scattered inside the solidified wall are formed by embedding styrene foam. Is preferred.

According to the present invention, since the solidified wall forming the wall of the start port or the arrival port has a large number of box holes inside, the solidified wall is cut with the cutter face, On the cut surface, there is no strength, or many weak spots with low strength appear as spots.

Therefore, when a cutter bit, a preceding bit or the like attached to the cutter face comes into contact with the solidified wall, the bit easily penetrates into the cutting surface via a weak spot that appears as a spot. Therefore, the cutting operation by the shield machine can be performed efficiently.

According to the invention, the wall of the starting port or the reaching port uses limestone as coarse aggregate,
Even if it is composed of solidified walls containing reinforced concrete using carbon fiber reinforced resin as tensile reinforcement,
It is possible to easily secure a bite of a cutter bit, a preceding bit, or the like into a cutting surface via a weak spot that appears in a spot-like manner, and to efficiently perform a cutting operation by a shield excavator.

In order to expose the spot-like weak spots on the cutting surface, a large number of boxes are provided, which are scattered inside the solidified wall, for example, by easily embedding styrofoam in the solidified wall. Can be provided.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments, ie, embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The starting or reaching port structure 10 of the shield machine according to this embodiment shown in FIG. 1 is used as a starting base provided on the planned route of the shield tunnel as shown in FIGS. 6 (a) and 6 (b). Of the shield excavator 13 at a predetermined depth through the starting shaft 11 (see (a)) and the reaching shaft 12 (see (b)) as a reaching base, or the shield excavating machine 13 Is provided as a wall of a starting port or a reaching port of the starting shaft 11 or the reaching shaft 12 in order to reach from the ground.

As shown in FIG. 1, the starting or reaching port structure 10 of this embodiment is a concrete wall 1 which can be cut by a cutter face of a shield machine 13.
4 and a large number of box holes 16 that are provided on the cut surface of the concrete wall 14 to expose spot-like weak spots 15 by being scattered inside the concrete wall 14. .

Here, the cuttable concrete wall 14 constituting the starting or reaching port structure 10 of this embodiment uses limestone as a coarse aggregate and a tensile reinforcing material 17.
And reinforced concrete 18 using carbon fiber reinforced plastic as described below. As described below, for example, inside a flute for constructing a shaft, excavated and formed by a flute excavator used for a continuous underground wall construction method or the like. Next, as shown in FIG. 2, a special continuous wall member 20 in which a rectangular pillar-shaped reinforced concrete 18 as a precast concrete product is interposed in the middle of a steel continuous wall member 19 made of an H-shaped steel is continuously inserted. By arranging, it is formed.

That is, when the special connecting wall member 20 is built in the vertical groove, the reinforcing connecting member 20 is arranged such that the reinforcing concrete 18 is located at the starting port portion or the reaching opening portion. The concrete 18 is arranged between the steel connecting wall members 19 and each is pre-assembled and manufactured. Therefore, as shown in FIG. 3, each special connecting wall member 20 is connected in the extending direction of the vertical groove 30. As a result, a concrete wall 14 that can be cut by a cutter face and has a size that covers the excavated cross section of the shield excavator 13 is formed on the side wall of the starting shaft 11 and the reaching shaft 12. (See FIG. 1).

As shown in FIG. 3, the adjacent special connecting wall members 20 are connected and integrated in a state where fitting joints 21 provided in advance at both side ends of each special connecting wall member 20 face each other. This is performed, for example, by fitting a joint plate 22 having an I-shaped cross section so as to straddle the pair of fitting joints 21.

In FIG. 3, (a) shows the connection state of the steel connecting wall member 19 constituting the special connecting wall member 20, and the fitting joint 21 and the joint plate 22 are made of steel. Things are used. (B) shows the connection state of the reinforced concrete 18 constituting the special continuous wall member 20, and the fitting joint 21 and the joint plate 22 are
Synthetic resin or ceramics that can be cut by the cutter face of the shield machine are used. Here, the fitting joint 2 of the reinforced concrete 18 part
By embedding the anchor 25 in concrete, 1 is attached to both side ends of the reinforced concrete 18 (see FIG. 4).

The reinforced concrete 18 constituting each of the special continuous wall members 20 is shown in FIGS. 1, 2, 4, and 5.
As shown in the figure, in a concrete using limestone as a coarse aggregate, for example, having a strength of about 600 to 800 kg / cm ² , a carbon fiber reinforced plastic strand is disposed as a tensile reinforcing material 17 and formed as a precast concrete. Will be.

The tension reinforcing member 17 is fixed to the joint box 23 via the fixing grip 24 at both ends in a steel joint box 23 provided at both ends of the reinforced concrete 18. By the flute 3
Along the pair of surfaces that will be along the inner wall surface of 0, five are each provided with a predetermined cover thickness, and a total of ten are provided.

The joint boxes 23 at both ends of the reinforced concrete 18 to which the tension reinforcing members 17 are fixed are connected to the steel connecting wall members 19 arranged with the reinforced concrete 18 interposed therebetween.
Are welded and fixed to the ends of the special continuous wall member 20 in which the steel continuous wall member 19 and the reinforced concrete 18 are continuously integrated.

The reinforced concrete 18 has
Stirrups 26 made of carbon fiber reinforced plastic are alternately arranged at intervals in the extending direction of the special continuous wall member 20 so as to surround the eight tensile reinforcing members 17 out of the ten tensile reinforcing members 17, respectively. Many are arranged in a zigzag pattern. Furthermore, about one-third of the large number of stirrups 26 has one of the portions extending in a direction intersecting with the surface along the inner wall surface of the vertical groove 30, and the stirrups 26 Along the way, square rod-shaped styrofoam 27
Are attached, and a large number of the styrofoams 27 are buried and installed in the reinforced concrete 18 as the box punches 16.

That is, this square rod-shaped styrofoam 2
7 are respectively attached to a part of a large number of stirrups 26 which will be located at the start port portion or the arrival port portion,
Since the concrete wall 14 extends in the thickness direction of the concrete wall 14 and is scattered in the concrete wall 14, when the concrete wall 14 is cut by the shield machine 13, the cut surface has almost no strength. The weak spot 15 due to the Styrofoam 27 is exposed in a spot-like manner.

In FIGS. 1, 4 and 5, what is indicated by reference numeral 28 is a waterproof rubber attached to the side surface of each reinforced concrete 18.

The work of laying the special continuous wall member 20 in the vertical groove 30 is performed while filling the vertical groove 30 with a stable liquid such as muddy water in the same manner as a general continuous underground wall construction method. At the same time, after the special continuous wall member 20 is connected and integrated, the surrounding space in the vertical groove 30 is filled with a cement-based hardened material such as bentonite mortar and solidified.

According to the starting port or reaching port structure 10 of this embodiment having the above-described configuration, the shield excavator 13 cuts the concrete wall 14 at the starting port or reaching port while directly cutting the concrete wall 14. Alternatively, when the reaching work is performed, the concrete wall 14 has a high strength,
Even in the case where limestone is used as coarse aggregate and precast concrete in which carbon fiber reinforced plastic strands are disposed as tensile reinforcing members 17, weak points where the bit attached to the cutter face appears in a spot-like manner Since the cutting work easily penetrates into the cutting surface via the cutting machine 15, the cutting operation by the shield machine 23 is efficiently performed.

The present invention is not limited to the embodiment in the above embodiment, but can be variously modified and adopted within the scope of the structure described in each claim. For example, the solidified wall of the starting port portion or the reaching port portion cut by the cutter face does not necessarily need to be provided by embedding the special continuous wall member 20 as described above, and may be provided using other various methods. it can.

Further, the starting base or reaching base for starting or reaching the shield excavator is not limited to the shaft, and for example, the present invention may be applied to a shield tunnel or other underground structure as the starting base or reaching base. It can also be applied.

Further, a large number of box openings provided to be scattered inside the solidified wall need not necessarily be formed by embedding styrofoam, but can be arranged by other various methods.

[0035]

As described in detail above, according to the launching port or the reaching port structure of the shield machine according to the present invention, the starting base or the wall of the launching port or the reaching port of the reaching base is formed of the shield machine. A solidified wall that can be cut by the cutter face and a large number of boxes that expose spot-like weak spots on the cutting surface by being scattered inside the solidified wall With the cutting work, the bit attached to this will easily penetrate the cutting surface through the weak spots that appear in spots, so that the cutting performance is easily improved and Alternatively, it is possible to efficiently perform a wall cutting operation by the shield machine at the time of arrival.

[Brief description of the drawings]

FIG. 1 is a front view illustrating a configuration of a launching port or a reaching port structure of a shield machine according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a configuration of a special continuous wall member that is built to form a solidified wall of a start port or an arrival port that can be cut by a shield machine.

FIGS. 3A and 3B are explanatory views showing a situation in which a special continuous wall member is continuously provided and integrated in a vertical groove.

FIG. 4 is a cross-sectional view illustrating a configuration of a reinforced concrete portion of a special continuous wall member.

FIG. 5 is a front view illustrating the configuration of a reinforced concrete portion of the special continuous wall member.

FIG. 6A is an explanatory diagram showing a situation in which a shield excavator starts from a starting base, and FIG. 6B is an explanatory diagram showing a situation in which the shield excavator reaches from a destination base.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Start-up port or arrival port structure 11 Start-up shaft (start-up base) 12 Attainment shaft (arrival base) 13 Shield excavator 14 Concrete wall (solidified wall) 15 Weak spot 16 Box emptying 17 Tensile reinforcement 18 Reinforced reinforced concrete 19 Steel Connecting wall member 20 Special connecting wall member 23 Joint box 24 Fixing grip 26 Stirrup 27 Styrofoam 30 Vertical groove

Claims (3)

[Claims] 1. A method for starting or reaching a shield excavator while directly cutting a wall of a start base or an arrival base by a cutter face of the shield excavator. A starting port or a reaching port structure provided on a wall of the reaching port, wherein a solidified wall made of a solidified material such as concrete or mortar cut by the cutter face is provided, and the solidified wall is scattered inside the solidified wall. A launching port or reaching port structure of a shield machine, comprising: a large number of box holes for exposing spot-like weak spots on the cut surface of the solidified wall. 2. The solidified wall cut by the cutter face uses limestone as coarse aggregate,
The launching port or reaching port structure of the shield machine according to claim 1, comprising reinforced concrete using carbon fiber reinforced resin as a tensile reinforcing material. 3. The shield machine according to claim 1, wherein the plurality of box holes provided in the solidified wall are formed by embedding styrofoam. Launching or reaching structure.