JPS60219397A - Blade shield drilling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a blade shield tunneling machine.

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.
Unlike a shield excavator, which uses the forward thrust from the rear segment or steel shoring, a blade shield excavator is used, which uses the frictional force between the blade and the ground around the excavator to propel itself. .

By the way, when the conventional blade shield excavator is used, after excavation, the formwork must be assembled and demolded independently of the excavation work in order to place concrete, and the formwork must be moved in conjunction with the excavation.

These materials were not equipped on the excavator, and the work was carried out using publicly known materials.

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

The present invention was developed to solve these problems, and it improves concrete placement efficiency by smoothly attaching and detaching formwork and moving it, and also enables concrete placement and lining at the same time as excavation. The purpose is to provide a blade shield excavator that is suitable for

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

[Overall structure of Iko In Fig. 1, 1 is an open type blade shield, and on the side of the U-shaped supporting frame 3 there is a side wall that is divided into two parts, a front blade 2 and a tail blade 21, and a joint between the blades with a pin. The side blades are arranged, and the bottom blade 22 is arranged on the bottom surface of the front part.

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

There is no bottom blade in the tail blade 21,
It is equipped with a formwork device 5 for pouring concrete.

10] Blade The blade uses a thin plate with a sufficient section modulus.

A front jack 23 is connected to the front blade 2, a bottom jack 24 is connected to the bottom blade 22, and the free end of each jack 23. Connect to supporting frame 3.

Each blade is configured to penetrate and propel itself into the soil with selective propulsion force 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, there is an excavator, waste soil removal device,
A driver's cab etc. (not shown) will be provided.

[C] A base 51 is placed in the tail blade 21 of the formwork device 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 part and the lower bottom part of the space of the engaging part 52, respectively, and the sleeve 4 is slidably inserted through these rollers 53.

The beam 4 is arranged parallel to the advancing direction of the excavator, and its total length is determined by the relationship between the formwork 6 and the formwork 6, which will be described later.
A stopper 4 is installed on the circumferential surface of the beam 4 to limit the slide to one span.
1 is installed protrudingly.

A formwork 6 made of a known material is placed 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 supporting it pivotally with a pin or the like.

Further, the free ends of a plurality of formwork jacks 54, one end of which is fixed to the engaging portion 52, are connected to the back side of the formwork 6, and each formwork jack 54 is expanded and contracted in the same direction, so that the formwork
The configuration is such that the distance between the blade 21 and the blade 21 can be adjusted.

That is, the structure is such that the formwork 6 can be opened and closed about the pivot point by expanding and contracting the formwork jack 54, and the formwork 6 can be set and the nG2 mold can be formed.

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

At both ends of the beam 4, there are side jacks 42 facing downward.
Attach.

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.

[A] After installing the digging blade shield 1 in the groove, when either jack 23 is extended, the extended front jack 23
The blade connected to blade 2 receives a reaction force due to the frictional resistance of all the blades that do not extend, and is pushed forward.
The tip penetrates into the ground.

The bottom blade 22 is similarly press-fitted into the ground and excavated with an excavator.

After all the blades have been 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.

[Loco-style set (Figure 4) First, extend the IC side jacks 42 provided at both ends of the beam 4 and fix them in place.

Nowadays, the jack 42 in the back is hardened concrete C.
1, the front jack 42 is set on the excavator.

Then, the formwork 6 in the contracted state is advanced by sliding on the beam 4 by a distance of 4] 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.

When the formwork device 5 is advanced, the formwork jacks 54 are extended to set the formwork 6 in a state in which concrete can be poured.

After setting the pouring forms 6 for box concrete 1 to 1, set the gable board 61 in front of the space between the blade 21 and the formwork 6, and pour concrete for the base through the inspection window and for the side walls through the upper opening. do.

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

[Removal of the outer formwork and excavation Before the concrete has sufficient strength, the formwork 6 is left as it is, and the front jack 23 is sequentially extended and the front blade 2 is advanced in the same way as in the excavation described above, and the concrete is covered with concrete. Aim for insulation between the construction 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 its entire weight is added to the concrete of the sphere, 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) When the concrete supported by the formwork 6 hardens, 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 Examples The above example describes the case of an open type blade shield, but when constructing a tunnel etc., a slidable blade is arranged on the entire circumference, and the above example is used inside the blade. 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 picture shape, a horseshoe shape, a circle, an arch culvert, etc.

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

Since the formwork is formed using the tail blade as the outer frame and the formwork attached to the formwork device as the inner frame, concrete can be placed directly within the blade avoiding contact with the ground.

Therefore, there is no need for primary covering such as conventional segment or shoring work, making it highly economical.

<Mouth> A formwork device was placed inside the blade.

Therefore, the work of excavation, attachment/detachment of 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 with 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 demolded.

(2) All mechanical operations can be controlled by one-man hydraulics.

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

Kuhe〉There are few voids between the lining concrete and the ground, so there is little impact on the ground.

[Brief explanation of drawings]

No. 1N: Explanatory diagram of one embodiment of the present invention Fig. 2 Side view of Niblade shield tunneling machine Fig. 3: Fig. 1
Cross section of ■-■ in the figure Figures 4 and 5 = Explanation of iM construction status 1 Ni-blade shield 2: Front blade 3: Supporting frame 4: Beam 6: Formwork 21: Tail blade Applicant Tomen Construction Machinery Sales Co., Ltd.

Claims (1)

[Scope of Claims] In a blade shield tunneling machine that moves forward using frictional resistance from 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-sectional A blade shield excavator characterized in that a formwork whose shape can be enlarged or reduced is slidably engaged with a beam.