JPH03187494A - Shield tunneling method and device therefor - Google Patents

Abstract

PURPOSE:To eliminate an useless construction in a connecting section by excavating the connecting section while assembling a curved part segment after excavation of a shaft, and constructing an adit by use of a separated front drum. CONSTITUTION:A shield machine is formed of a front drum 2, a rear drum 3, a hinge 4 for connecting the both, and an excavating mechanism 5, and both inside surfaces of the contact end between the front drum 2 and rear drum 3 coaxially disposed are fixed by a band steel material 6. A seal material 62 is provided to stop water, and excavation is carried out to a determined depth while assembling a shaft part segment 7. Before constructing a curved part, the shaft part segment 7 is integrated with the rear drum 3, and the contact surface between the front drum 2 and the rear drum 3 is coaked while removing the band steel material 6. A cutter device 21 and an excavator 5 are operated to excavate the connecting section while assembling a curved part segment 71, and a hinge shaft 43 is pulled out from the inside to separate the front drum 2 from the rear drum 3, and an adit is further constructed by use of this front drum 2. Hence, the useless construction in the connecting section can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a shield construction method and an apparatus therefor capable of excavating from a vertical shaft to a horizontal shaft at a steep angle.

<Prior Art> In shield tunnel construction, when excavating continuously from a vertical shaft to a horizontal shaft, a folding type shield machine or the like is usually used.

<Problems to be solved by the present invention> The above conventional technology has the following problems.

<A> As shown in Fig. 5, a folding type shield machine 8
In the conventional method of continuous excavation using, for example, the connecting section between the vertical shaft 81 and the horizontal shaft 82, it is possible to excavate only a curve with a radius larger than necessary.

Therefore, there is a lot of wasteful construction work in curved sections, which is uneconomical in terms of both construction cost and construction period.

<Exit> During the construction of the tunnel and after its completion, when transporting equipment and materials from the ground, special equipment is required to transport equipment and materials through curved sections with large radii, which is uneconomical.

<C> Since the curve section is long, a large number of R-processed segments are required, which is uneconomical.

<Object of the present invention> The present invention was made to solve the above-mentioned problems, and it is possible to excavate the connecting section between the vertical shaft and the horizontal shaft at a steep angle, thereby reducing the construction cost and construction period. The purpose of the present invention is to provide a shield construction method and its equipment that can achieve this goal.

<Means for Solving the Problems> That is, the present invention has a front shell having a cutter device at the tip of the excavation and an excavation mechanism provided on the outer periphery of the outer shell, and a coaxial cutter device at the rear end of the front shell. excavation is carried out with the front shell and the rear shell fixed coaxially by a shield machine consisting of a hinge that connects the front shell and the rear shell so that they can be bent freely in the direction of the installation side of the excavation mechanism. Next, the front and rear shells are configured to be separable except for the hinged connection, and the cutter device and excavation mechanism of the front shell are operated to create a shaft at a predetermined angle around the hinge. This is a shield construction method characterized by the construction of a connecting section between the vertical and horizontal shafts by rotating the excavation up to the maximum depth.

The present invention also provides a front shell having a cutter device at the tip of the excavation and an excavation mechanism provided on the outer periphery of the outer shell, a rear shell disposed coaxially at the rear end of the front shell, and a front shell. This is a shield machine characterized in that the rear body is formed by a hinge connected to the rear body so as to be bendable in the direction of the mounting side of the excavation mechanism.

<Description of the present invention> The present invention will be explained in detail below.

[Structure 1 of the shield machine <A> Structure of the entire shield machine (Fig. 1) The shield machine 1 of the present invention mainly consists of a front body 2, a rear body 3, a hinge 4 connecting them, and an excavation mechanism 5. It consists of more.

<Mouth> Front shell (Fig. 1) The front shell 2 has a cutter device 21 used for main excavation at the excavation tip of the outer shell (skin plate).

The front shell 2 is equipped with a propulsion jack, a mud transport device, a segment assembly device, etc., like a normal shield machine.

<C> Rear body (FIG. 1) The rear body 3 has a cross section in a direction orthogonal to the axis of its outer shell that is equal to a cross section in a direction orthogonal to the axis of the outer shell of the front body 2.

Then, it is arranged coaxially with the digging rear end portion of the front shell 2.

At this time, a water stop plate (not shown) is attached to the digging rear end of the rear shell 3 (the upper end in the figure) to close the space between the inner circumferential surface of the rear shell 3 and the outer circumferential surface of the shaft segment 7. put.

<2> Hinge (Fig. 2) The hinge 4 connects the front body 2 and the rear body 3 in a bendable manner.

For example, as shown in FIG. 2, protrusions 41 and 42 are provided on the outer surfaces of the contact ends of the front body 2 and the rear body 3 so as to mesh with each other, and these protrusions 41 and 42 are pivotally supported by a hinge shaft 43. Structure, etc. can be considered.

<E> Excavation mechanism (FIG. 3) For the excavation mechanism 5, a water jet or the like is used, for example.

As shown in FIG. 3, this excavation mechanism 5 is attached to the front body 2 on the same side as the hinge 4 attachment side.

Further, it is installed on the entire surface of the front body 2 in the direction of rotation.

[Construction method 1] Next, using the shield machine 1 configured as described above,
Explain how to build a tunnel.

<B> Construction of the shaft Before constructing the shaft, a steel strip 6 as shown in Fig. 2 is fixed with bolts 61 or the like to the inner peripheral surface of the contact end between the front shell 2 and the rear shell 3. .

The contact surfaces between the steel strip 6 and the front shell 2 and the rear shell 3 are watertighted by a sealing material 62.

In this way, the front shell 2 and the rear shell 3 are fixed coaxially, and the shaft segment 7 is assembled and excavated to a predetermined depth.

At this time, since a water stop plate is attached to the rear end of the excavation of the rear body 3, it is possible to prevent groundwater, earth and sand, backfilling agent, etc. from flowing in.

In addition, when excavating a vertical shaft, the hinge 4 and the excavation mechanism 5 are
It is positioned in advance on the side of the curve in the connection section.

<Entrance> Construction of the connecting section Before constructing the curved section of the connecting section between the shaft and the horizontal shaft, the shaft segment 7 and the rear body 3 are integrated by welding or high-strength adhesive.

Next, while removing the steel strip 6, the contact end between the front shell 2 and the rear shell 3 is caulked with resin mortar.

Alternatively, hard rubber may be replaced with bolts.

These caulking and hard rubber are separable when the front body 2 is bent.

After the above preparations are completed, the cutter device 21 and excavation mechanism 5 are
while assembling the curve segment 71.
Excavation of the connecting section is started using the propulsion jack installed on the front shell 2.

At this time, as shown in FIG. 4, it is impossible to excavate the shaded area with only the cutter device 21, but since the shaded area is excavated by the excavation mechanism 5, the front body 2 is moved at a steep angle (
It is possible to perform rotary excavation up to right angles or even acute angles.

After excavating to a predetermined angle, the rotation of the front barrel 2 is stopped.

In addition to assembling R-processed segments, the connecting section of the tunnel may be constructed by casting in place using resin concrete or the like.

<C> Construction of the horizontal shaft After the excavation of the connecting section is completed, the hinge shaft 43 is extracted from the inside of the shield machine 1, and the front shell 2 and the rear shell 3 are separated.

Then, the separated front shell 2 can be used to construct a horizontal shaft by digging in a straight line, similar to a normal shield machine.

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

<B> The conventional method of continuous excavation using a folding type shield machine etc. can only excavate the continuous part of the vertical shaft and horizontal shaft with a curve with a radius larger than necessary.
There is a lot of unnecessary construction work in curved sections, which is uneconomical in terms of both construction cost and construction period.

In contrast, the present invention has a structure in which the front body and the rear body of the shield machine are connected in a bendable manner, and the front body can be rotated and excavated using the rear body as a fulcrum.

Therefore, a tunnel can be constructed by excavating a continuous portion of a vertical shaft and a horizontal shaft at a steep angle such as a right angle or an acute angle.

Therefore, there is no unnecessary construction work in the connecting section, and construction can be carried out economically in terms of both construction cost and construction period.

<Exposure> The shield machine of the present invention can also handle sharp horizontal direction changes under roads and at intersections.

<C> With conventional technology, during tunnel construction and after completion,
When transporting equipment, materials, etc. from the ground, special equipment is required to transport them around curved sections with large radii, which is uneconomical.

However, in the case of the present invention, since the connecting section between the vertical shaft and the horizontal shaft can be constructed at a steep angle, equipment etc. can be lowered straight down the vertical shaft.
All you have to do is pull it straight into the shaft.

Therefore, it is not necessary to transport the equipment in a curved manner, and there is no need for a special transport device as in the past.

<2> In the conventional technology, since the distance of the curve section is long, the R
A large number of processed segments are required, which is uneconomical.

In contrast, in the present invention, the connecting section between the vertical shaft and the horizontal shaft has a small radius and a short distance.

Therefore, the number of R-processed segments can be reduced, which is economical.

<E> The shield machine of the present invention consists of a front body and a rear body, and the tail portion is longer than that of a normal shield machine.

Therefore, it is possible to excavate the shaft more than one ring at a time, and the construction period can be shortened.

<F> Since the hinge portion of the shield machine of the present invention protrudes into the ground from the outer shell, the hinge portion acts as a resistance to other mountains, and can prevent rolling of the shield machine.

[Brief explanation of drawings]

Fig. 1.2 An explanatory diagram of the structure of the shield machine of the present invention. Fig. 2: An explanatory diagram of the hinge connection part. Fig. 3: An explanatory diagram of the excavation mechanism. Fig. 4: An explanatory diagram of the digging operation of the continuous part. Fig. 5: Illustration of conventional technology

Claims (2)

[Claims] (1) A front shell that has a cutter device at its digging tip and an excavation mechanism on the outer periphery of the shell, a rear shell that is coaxially arranged at the rear end of the front shell, and a front shell and a rear shell. A vertical shaft is constructed by excavating the front shell and the rear shell with the front shell and the rear shell fixed coaxially using a shield machine consisting of a hinge connected to the mounting side of the excavation mechanism so as to be bendable. The cutter device and excavation mechanism of the front shell are operated to rotate the shaft to a predetermined angle around the hinge, and connect the vertical shaft and horizontal shaft. A shield construction method characterized by constructing sections. (2) A front shell that has a cutter device at its digging tip and an excavation mechanism on the outer periphery of the shell, a rear shell that is coaxially arranged at the rear end of the front shell, and a front shell and a rear shell. A shield machine, comprising: a hinge connected to the excavation mechanism so as to be bendable in the direction of the installation side of the excavation mechanism.