JPH068598B2 - Shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a shield machine.

<Prior Art> In a conventional shield excavator, a ready-made segment is assembled and a reaction force is applied to the segment to propel the shield.

On the other hand, there is a device that propels the shield by taking a reaction force to the concrete immediately after it is rolled up.

<Disadvantages of conventional device> The present invention relates to the latter device, but has the following disadvantages when the excess water existing inside the concrete is discharged to the outside when the concrete is pressurized.

<A> Excess water that is pressurized and squeezed out flows into the premises only from the inner mold, so that a large amount of water containing mortar falls from the overhead of the worker, which deteriorates the work environment.

<B> Excess water is discharged from the inside, but cannot be discharged from the outside that contacts the natural ground.

Therefore, it is not possible to improve the quality of the inside and outside of concrete.

<C> It is uneconomical because it is necessary to open drainage ports on all the inner molds, and special molds must be manufactured.

<D> A great deal of work is required to prevent clogging of the drainage port of the formwork.

<E> Since the drainage is done from many drainage outlets, it is not possible to accurately grasp the amount and it is not possible to adequately control the quality of concrete.

<Object of the present invention> The present invention has been made to improve the above points, and an object of the present invention is to provide a shield machine capable of sufficiently discharging excess water in pressurized concrete.

<Structure of the Present Invention> Next, an embodiment of the present invention will be described with reference to the drawings.

<A> Overall structure of shield machine The shield machine of the present invention is configured by a double cylinder.

That is, there are a hood cylinder 1 located at the front and a tail cylinder 2 located at the rear when the digging is performed.

Then, the tail tube 2 is slidably housed inside the hood tube 1.

Between the hood barrel 1 and the tail barrel 2 is a jack 1 for the hood barrel.
Position 1

By expanding and contracting the jack 11 for the hood cylinder, both cylinders 1, 2
Slide on each other.

<B> Pressurizing Device A press ring 3 is slidably positioned inside the tail tube 2 to press the poured concrete.

A pressing jack 31 is located between the press ring 3 and the tail tube 2.

The expansion and contraction of the pressing jack 31 slides the press ring 3 to compress the concrete.

The press ring 3 is provided with a recess for fitting a drainage rod 4 which will be described later, and when inserting a reinforcing bar, a reinforcing bar hole 32 may be opened.

<C> Drain bar A plurality of drain bars 4 are attached to the inner surface of the tail tube 2 in parallel with the axis of the shield device at regular intervals.

The drainage rod 4 is a rod-shaped body having both ends closed and a hollow portion 42 provided therein, and has a large number of drainage ports 41 penetrating from the peripheral surface to the hollow portion 42.

The drain bar 4 is mounted on the inner surface of the tail tube 2 at least over the length of the moving range of the press ring 3.

When mounting the drain bar 4, the drain bar 4 is not fixed to the inner surface of the tail cylinder 2, but is mounted with a screw 43 or the like, is detachably mounted, and is configured to be integrally propelled with the tail cylinder 2.

<How to Use the Shield Machine of the Present Invention><B> Preparation Before placing concrete, the drain bar 4 is provided inside the tail tube 2.
Attach.

Next, the rebar is assembled inside the drain bar 4.

Therefore, the press ring 3 is advanced to the hood cylinder 1 side to secure a space.

Of course, this work is not necessary for concrete without reinforcing bars.

<B> Advancement of Inner Formwork By assembling the inner formwork 5 inside the tail cylinder 2, a space for filling concrete with the tail cylinder 2 can be formed.

As the inner formwork 5, both those provided with a drainage port and those not provided with a drainage port can be adopted.

The drain bar 4 described above may be attached to the inner surface of the inner formwork 5.

Then, as shown in FIG. 3, the inner formwork 5 is advanced to form a space surrounding the group of reinforcing bars G by the tail cylinder 2, the press ring 3 and the inner formwork 5.

<C> Placing and draining of concrete Pressed concrete is pressurized from the inner mold 5 or part of the press ring 3.

<D> Pressurization and Drainage While pressing the press-fitted concrete with the press jack 31, the tail cylinder 2 is moved forward.

Excess water inside the concrete is forced to move due to the pressure at this time and concentrates on the drain bar 4, and the drain port 4 of the drain bar 4
1 to the outside through the hollow portion 42 inside.

Therefore, the water-cement ratio of concrete is rapidly improved.

<Effects of the Present Invention><B> Since the excess water in the concrete is forcibly discharged, the quality of the concrete can be positively improved.

<B> It is possible to drain excess water on the natural ground side of concrete.

Therefore, the quality of concrete can be surely improved.

<C> In tunnel construction, when the inner formwork that is not provided in the drainage port is used, excess water to be removed is guided from the hollow part to the outside of the concrete pouring range through the drainage port of the drainage rod. Therefore, it hardly leaks inside the inner formwork.

Further, even when the inner empty frame provided with a drainage port is used, the amount of surplus water leaking into the inner formwork is reduced by the amount of water drained from the drain bar.

Therefore, the working environment inside the shield can be improved.

[Brief description of drawings]

 FIG. 1 is a side view of an embodiment of the shield device of the present invention. Figures 2 and 3: Explanatory drawing of the main part.

Claims (1)

[Claims] 1. A shield machine having a press ring disposed inside a tail tube of a skin plate so as to be movable in a direction parallel to the axis of the tail tube, and having a press ring for pressing unconsolidated concrete placed inside the tail tube. In the inner surface of the tail cylinder, a hollow rod body that is mounted in a direction parallel to the axis of the tail cylinder over at least the movement range length of the press ring and that is integrally propelled with the tail cylinder, A shield machine having a drain bar having a large number of drain holes penetrating to a hollow portion, and a recess to which the drain bar is fitted is provided at an outer peripheral edge of the press ring.