JPH0332658B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blade shield excavator.

There is a blade shield method, which is a type of tunnel construction method and has the characteristics of both the Metsu cell method and the shield method.

In other words, this method consists of placing sheet piles called blades around the outer circumference of the tunnel, a supporting frame that supports the blades, and a hydraulic jack that moves the blades forward, and a shield that is attached to the rear segment of the forward thrust or to the steel shoring. Unlike excavators, blade shield excavators are used, which self-propel by utilizing the frictional force between the blade and the ground around the excavator.

By the way, when using the conventional blade shield excavator mentioned above, after excavation, in order to place concrete, the formwork must be set up independently of the excavation work, removed from the formwork, and moved as the excavation progresses. No.

These materials are not equipped on the excavator,
This was done using known materials.

Therefore, there was a problem that concrete lining required a lot of work and the overall construction efficiency was low.

The present invention was made to solve these problems, and it improves the concrete placement efficiency by smoothly attaching and detaching the formwork and moving it, and
The purpose of the present invention is to provide a blade shield excavator capable of pouring concrete and lining at the same time as excavating.

Next, embodiments of the present invention will be described based on the drawings.

[B] Overall configuration Figure 1 shows an example of an open type blade shield.

On the side of the U-shaped supporting frame 3, a side blade is arranged which is divided into a front blade 2 and a tail blade 21 and jointed with a pin between the blades, and a bottom blade 22 is arranged on the bottom of the front part. .

Furthermore, each of the front blades 2 and the bottom blades 22 is connected to the supporting frame 3 via a hydraulic jack so that they can move forward and backward.

There is no bottom blade inside the tail blade 21, but a formwork device 5 for pouring concrete is provided.

[B] Blade For the blade, use a thin plate with a sufficient section modulus.

A front jack 23 is connected to the front blade 2, and the bottom blade 2
Connect the bottom jacks 24 to 2, respectively.
The free end of each jack 23, 24 is connected to the supporting frame 3.

Each blade is configured to penetrate and propel the soil with selective propulsion while supporting earth pressure.

The tail blade 21 also has the purpose of serving as an outer frame during concrete pouring.

Inside the front blade 2, an excavator, a waste soil removal device, a driver's cab, etc. (not shown) are provided.

[C] Formwork device A base 51 is arranged in the tail blade 21 in the transverse direction of the excavated groove as shown in FIG.

At both ends of the base 51, engaging portions 52 having spaces communicating in the groove direction are formed.

As shown in FIG. 3, rollers 53 are attached to the upper and lower parts of the space of the engaging portion 52, respectively, and the beam 4 is slidably inserted through these rollers 53.

The beam 4 is arranged parallel to the direction of movement of the excavator, and its total length is longer than the width of the formwork 6 in the groove direction in order to move the formwork 6 forward, as will be described later. A stopper 41 is provided to protrude from the circumferential surface of the beam 4 in order to limit the distance.

A formwork 6 made of a known material is disposed between the engagement part 52 and the blade, and the lower part of the formwork 6 is attached to the lower end of the engagement part 52 by being pivotally supported with a pin or the like.

Further, on the back side of the formwork 6, one end is attached to an engaging portion 52.
It is connected to the free ends of a plurality of formwork jacks 54 fixed to the formwork jacks 54, and the space between the formwork 6 and the blade 21 can be adjusted by expanding and contracting each formwork jack 54 in the same direction.

That is, the structure is such that the formwork 6 can be set and removed by opening and closing the formwork 6 about the pivot point by expanding and contracting the formwork jack 54.

The purpose of the formwork 6 is to form an inner frame while the tail blade 21 forms an outer frame.

Side jacks 42 are attached to both ends of the beam 4 so as to face downward.

As a result, when all the side jacks 42 are extended, the formwork device 5 will be supported at four points.

Next, the construction method will be explained.

[B] Digging After installing the blade shield in the groove, when any jack 23 is extended, the blade connected to the extended front jack 23 moves forward by receiving a reaction force due to the frictional resistance of all the blades that are not extended. It is pushed out, and the tip of the blade 2 penetrates into the ground.

The bottom blade 22 is also pressed into the ground in the same way,
Dig with an excavator.

After all the blades are advanced in this manner, when the hydraulic jacks connected to each blade are simultaneously retracted, the supporting frame 3 slides toward the face side due to the frictional resistance of all the blades.

The above is the same as the conventional excavation method.

[B] Setting the formwork (Fig. 4) First, the side jacks 42 provided at both ends of the beam 4 are extended and fixed in place.

At this time, the rear jack 42 is set on the hardened concrete C1, and the front jack 42 is set on the excavator.

Then, the contracted formwork 6 is moved forward by sliding on the beam 4 by a distance of one span.

Since the formwork device 5 is slidably mounted on the beam 4, it can be easily moved forward by human power without using mechanical force.

After the formwork device 5 is advanced, the formwork jacks 54 are extended to set the formwork 6 in a state ready for concrete pouring.

[C] Placing concrete After setting the formwork 6, set the end plate 61 in front of the space between the blade 21 and the formwork 6, and pour concrete on the base through the inspection window and on the side walls through the upper opening. .

It is also possible to pour concrete through a separately provided injection port.

[d] Demolding and excavating the outer formwork Before the concrete has sufficient strength, leave the formwork 6 as it is and sequentially extend the front jack 23 and move the front blade 2 forward in the same way as in the excavation described above, and start the concrete. Aim for insulation between the lining wall and the outer formwork.

However, the inner formwork is supported and cured by the formwork 6 until sufficient strength is obtained.

In this way, even during the concrete curing period, the machine can be moved forward for the next excavation without interrupting construction work.

At that time, if the jack 42 of the beam 4 is shortened and the entire weight is added to the concrete floor, the beam 4 will not become an obstacle to the forward movement of the aircraft.

[E] Advancement of the beam and inner formwork (Fig. 5) Once the concrete supported by the formwork 6 has hardened, the formwork jacks 54 are contracted to remove the formwork 6 from the concrete C2.

Next, the beam 4 with the jacks 42 at both ends shortened.
is manually advanced by one span in the excavation direction.

Then, the jack 42 is extended and engaged with the beam 4 to move the formwork 6, which is the inner formwork, forward.

[f] Other embodiments The above embodiments have been explained regarding the case of an open type blade shield, but when constructing a tunnel etc., a slidable blade is arranged on the front circumferential surface, and the above embodiments are arranged inside the blade shield. A blade shield excavator equipped with a contracting formwork device similar to the above can be adopted.

Therefore, the cross-sectional shape of the frame is not limited to the open beam of the present invention, but can be freely selected such as a box shape, a horseshoe shape, a circle, an arch culvert, etc.

Since the present invention is as explained above, the following effects can be expected.

<B> Since the formwork is formed with the tail blade serving as the outer frame and the formwork attached to the formwork device serving as the inner frame, concrete can be poured directly within the blade while avoiding contact with the ground.

Therefore, there is no need for primary lining such as segment or shoring work as in the past, and the formwork device is placed inside the blade, which is highly economical.

Therefore, the work of excavation, installation and removal of the formwork, and concrete lining can be performed as one cycle, and can be performed continuously for any number of cycles, thereby improving work efficiency.

<C> A formwork device having a formwork configured to open and close in a direction transverse to the excavation direction by jacking was placed inside the blade.

Therefore, the mold can be easily set and removed.

<D> All mechanical operations can be controlled by one-man hydraulics.

<E> Depending on the shape of the excavation hole, the cross-sectional shape of the formwork can be freely selected, for example, circular, horseshoe-shaped, rectangular, etc.

<F> There are few voids in the concrete lining and the ground, so there is little impact on the ground.

[Brief explanation of drawings]

Figure 1: An explanatory diagram of an embodiment of the present invention, Figure 2:
Side view of the blade shield tunneling machine, Figure 3: No. 1
4-5: Explanatory diagram of construction state 2: Front blade, 3: Supporting frame, 4: Beam, 6: Formwork, 21: Tail blade.

Claims (1)

[Scope of Claims] 1. In a blade shield tunneling machine that moves forward using frictional resistance from the surrounding ground as a reaction force, a beam is installed inside the shield tunneling machine parallel to the direction of movement, vertical jacks are attached to both ends of the beam, and a cross section is formed. A blade shield excavator characterized by a formwork that can be enlarged or reduced in shape and slidably engaged with a beam.