JPH0735718B2 - Vertical shaft construction method and device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method and an apparatus for constructing a shaft by a shield machine.

<Problems of conventional technology> Conventionally, it took a considerable period of time to construct a vertical shaft in shield construction.

That is, conventionally, a shaft was constructed by a caisson, a continuous underground wall, a steel sheet pile construction method, or the like.

Therefore, the work was complicated, such as changing the equipment and setup before starting the main shield work, and there was much waste in terms of construction period and equipment.

<Purpose of the present invention> The present invention has been made to solve the above problems, it is possible to shorten the construction period of the shaft, and also to construct a shaft with high accuracy It is an object of the present invention to provide a construction method and a device therefor.

<Means for Solving Problems> That is, according to the present invention, a plurality of anchor cables are installed outside the planned excavation contour of a vertical shaft along the longitudinal direction of the planned excavation contour, and the anchor cables are moved along the way. Attach a cable gripper that can be gripped to the outer circumference of the cylindrical body of the shield machine, use the anchor cable as a guide to advance the shield machine to a predetermined depth, and assemble the segments behind the shield machine to construct a vertical shaft. It is a vertical shaft construction technology characterized by that.

<Description of the Present Invention> The present invention will be described in detail below.

<B> Shield Machine Structure (FIGS. 1 and 2) The shield machine 1 according to the present invention has, in addition to the functions of the conventional shield machine, such as excavation and earth removal, as shown in FIG. A plurality of cable grippers 11 are circumferentially installed.

The cable gripper 11 is configured to movably grip an anchor cable 2 which will be described later.

For example, like a center hole jack, the anchor cable 2 is passed through two gripping members, and the gripping members alternately grip and release the anchor cable 2.
At the same time, it is constructed so that it can be expanded and contracted at the same time to continuously send out or draw in the anchor cable 2.

<B> Construction of earth anchor (Fig. 3) Next, a construction method will be described.

First, the shield starting turret 3 which doubles as the assembly turret of the shield machine 1 and the reaction force of the anchor cable 2 is assembled on the ground portion of the construction point.

The shield starting turret 3 is constituted by a pillar and a ceiling beam 31 and the like, and has a space inside which the shield machine 1 can be installed.

Next, outside the planned excavation contour of the shaft, along the longitudinal direction of the planned excavation contour, the required number of anchor cables 2 are accurately installed to a predetermined depth.

The lower end of the anchor cable 2 has an anchor fixing portion 21.
The ground part is temporarily fixed to the shield starting turret 3.

<C> Installation of Shield Machine (FIG. 4) Next, the shield machine 1 is assembled in the shield starting turret 3 in a state of being floated from the ground surface by a support tool for assembly or the like (not shown).

At this time, the cutter unit 12 of the shield machine 1 is assembled in the excavation direction on the ground side.

Further, the anchor cable 2 is penetrated and gripped in each cable gripping tool 11 attached to the outer peripheral portion of the shield machine 1, and the upper end portion of the anchor cable 2 has a shield starting tower 3
It is fixed to the ceiling beam 31 of the fixing member 22 or the like.

After the assembly of the shield machine 1, the support tools for assembly are removed, and as shown in FIG.
Is suspended along the anchor cable 2.

<D> Vertical shaft excavation (Fig. 1) After preparation for vertical shaft excavation is completed, the shield machine 1 is operated and the vertical shaft excavation is started using the anchor cable 2 as a guide.

At this time, the gripping force of the anchor cable 2 of the cable gripping tool 11 is finely adjusted so that the cutter portion 12 of the shield machine 1 is not overloaded, and the excavation speed is controlled to excavate.

In addition, the excavation depth becomes deeper and the shield machine 1 is affected by the effects of groundwater, mud pressure (in the case of a mud pressure shield machine), etc.
If buoyancy begins to occur in the
According to 11, it is good to install while pulling the anchor cable 2.

Further, when excavating the shield machine 1 while suspending it from the anchor cable 2, rolling may occur due to a small digging reaction force, but the digging reaction force can be applied to the surrounding anchor cables 2. , Rolling can be prevented.

As described above, the shield machine 1 is advanced to a predetermined depth, the segment 4 is assembled behind the shield machine 1, and the construction of the shaft is completed.

Therefore, according to the present invention, since the anchor cable 2 which has been constructed with high precision in advance can be used as a guide for excavation, it is possible to construct a shaft with extremely high precision.

After the construction of the shaft is completed, the same shield machine 1 can be used for continuous main construction.

<Effects of the Present Invention> Since the present invention has been described above, the following effects can be expected.

<a> Conventionally, since vertical shafts were constructed by caisson, underground wall, steel sheet pile construction method, etc. Also, there was a lot of waste in terms of equipment.

On the other hand, the present invention can construct a shaft using a shield machine with the assistance of the earth anchor construction method.

Therefore, the vertical shaft and the main shaft can be continuously constructed by the shield machine from the ground surface, and the construction period spent for the vertical shaft can be considerably shortened as compared with the conventional technique.

Moreover, since the shield machine used for the construction of the shaft can be used as it is for the main construction, there is no waste in terms of equipment and it is economical.

<B> When constructing a vertical shaft with a shield machine,
An anchor cable that has been constructed with high precision in advance can be used as a guide.

Therefore, the vertical shaft construction accuracy is improved.

<C> Since the excavation is performed while the anchor cable is grasped by the cable grasping tool, a reaction force for preventing rolling of the shield machine during excavation can be applied to the anchor cable.

Further, during the excavation, when the shield machine floats up due to the buoyancy, a reaction force is applied to the anchor cable and the cable gripping tool is moved downward to prevent the uplift.

Therefore, it is possible to improve the construction accuracy of the shaft and the workability.

<D> By moving the cable gripping tool and finely adjusting the vertical movement of the shield machine, the load acting on the cutter section can be adjusted.

Therefore, the cutter load can be appropriately selected, the workability can be improved, and the shield machine can be prevented from malfunctioning.

<E> In the prior art, a plurality of ropes installed in the vertical direction inside the planned excavation outline of a vertical shaft, and a chuck device for movably gripping the middle of the ropes are attached inside the tubular body. There is a vertical shaft construction technology consisting of a press-fit type shield machine (Japanese Patent Laid-Open No. 62-182390).

Comparing the above-mentioned conventional technique with the present invention, the present invention has various excellent effects as follows.

The present invention can be applied to a machine digging sealed type shield machine or the like having a rotary excavation cutter on the front surface of a cylindrical body, whereas the prior art cannot be applied to such a shield machine.

Because, in the present invention, since the anchor cable gripping device is attached to the outer peripheral portion of the tubular body, there is no problem even if the rotary drilling cutter is provided on the front surface of the tubular body. This is because it is structurally impossible to adopt the rotary excavation cutter method because the chuck device is attached inside the cylindrical body.

Therefore, the present invention is not limited to the structure of the shield machine and has an excellent effect that the application range is wide, but the shield machine of the prior art has a drawback that the application range is very narrow. is doing.

Further, in the present invention, since the anchor cables are installed on the outer circumference of the cylindrical body and the distance between the anchor cables is maximized, the effect of preventing rolling during excavation is high.

However, in the prior art, since the cords are gathered in the central portion of the tubular body and the interval between the cords is narrow, the effect of preventing rolling during excavation is reduced.

Further, according to the present invention, only the gripping device is fixed to the outer peripheral portion of the cylindrical body, no improvement of the shield machine itself is required, and the shield machine can be manufactured at low cost regardless of the type.

However, in the case of the prior art, a special improvement for penetrating and gripping the rope in the shield machine is required, which is very uneconomical.

Further, according to the present invention, since the anchor cable is installed outside the cylindrical body, the space inside the shield can be widely used, and it becomes easy to carry in and out materials and equipment such as segments.

However, in the case of the conventional technique, a plurality of cords pass through the shield, which hinders the carrying in and out of materials and equipment,
Workability is extremely poor.

[Brief description of drawings]

 Fig. 1: Explanatory drawing of vertical shaft Fig. 2: Explanatory drawing of cable gripping tool Fig. 3 and 4: Explanatory drawing of excavation preparation

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshihiko Bessho 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Corporation (72) Inventor Noriomi Yasuhara 1-2-25 Nishishinjuku, Shinjuku-ku, Tokyo No. 1 in Taisei Construction Co., Ltd. (72) Inventor Toshimi Ino 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Inside Taisei Co., Ltd. (72) Inventor Nao Obara 1-25-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Taisei Corporation (56) References JP-A-62-182390 (JP, A)

Claims (2)

[Claims] 1. A cable gripping tool, which is provided outside a planned excavation contour of a vertical shaft, in which a plurality of anchor cables are installed along the longitudinal direction of the planned excavation contour, and which movably grips along the way of the anchor cable. Construction of a vertical shaft, which is characterized in that it is attached to the outer periphery of the machine's tubular body, the shield machine is driven to a predetermined depth using the anchor cable as a guide, and segments are assembled behind the shield machine to construct a vertical shaft. Method. 2. An apparatus used in the method for constructing a shaft according to claim 1, comprising a plurality of units installed outside the planned excavation contour of the shaft along the longitudinal direction of the planned excavation contour. A vertical shaft constructing device comprising an anchor cable and a shield machine in which a cable gripping tool for movably gripping the anchor cable along the way is attached to the outer peripheral portion of the cylindrical body.