JPH07229395A - Mesail shield machine - Google Patents

Abstract

PURPOSE:To properly fill space between the natural ground and a form with concrete by connecting a table blade to mesail members in such state as freely movable relatively, and moving forward the table blade using a winch. CONSTITUTION:A plurality of mesail members 1 are laid in parallel on the external surface of frames 7 with the forward ends directed in an advance direction, and each mesail member 1 is supported on the frames 7 via a front jack 8 contractible in a front and rear direction. Ready-mixed concrete is placed in space formed out of an inner form 13 and a gable form 14 assembled inside the rear section of the cutter 1, thereby forming lining 16. In this construction method, a table blade 2 is jointed to the mesail members 1, so as to be freely movable relatively. Also, the table blade 2 is driven forward with a winch 6, a wire rope 5 and a block 4 laid on the frames 7. Furthermore, the table blade 2 and the form 14 are jointed to each other with a bolt 19.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an improvement of a Messel shield machine used for excavating tunnels and constructing linings.

[0002]

2. Description of the Related Art A Messel shield machine for tunnel construction is constructed, for example, by arranging a plurality of strip-shaped Messels in the axial direction along the outer periphery of a frame having an outer shape that is substantially the same as the tunnel excavation cross section. A jack that expands and contracts in the front-back direction is interposed between the frame and the frame.

Excavation of the face is carried out by a boom cutter provided inside the frame, and a pair of left and right mesels at symmetrical positions corresponding to the excavation are pushed forward by extension of the jack to protect the excavated surface. The reaction force associated with this extrusion is supported by the frictional resistance between the remaining Messel and the natural ground.

When the jacks are contracted all together after pushing out all the messels, the messels do not retract due to frictional resistance with the surrounding ground, but instead the frame advances.

In this way, the excavation work is performed by repeating the extrusion of the messel and the advance of the frame.

On the other hand, behind the shield machine, lining forms are assembled every time the shield machine advances by a predetermined distance, and concrete is formed between these forms and the tail blade integrally formed at the rear of the Messel. It is cast. The tail blade protects the inner space against the pressure of the ground, and its rear end is supported by the already hardened lining or inner mold.

[0007]

PROBLEM TO BE SOLVED: The tail blade advances integrally with the messel, and after the tail blade has moved, a space corresponding to the tail blade and excess dug is formed between the placed lining concrete and the ground. . If this void is left unattended, the void will be filled with earth and sand due to the collapse and compression of the ground, and the ground subsidence will occur accordingly.

Therefore, after the tail blade is moved, it is necessary to inject the backing material into the gap between the lining concrete and the ground, which is troublesome. In addition, there is a problem that the backing material must be injected promptly before the ground collapse or compression occurs, which makes the implementation timing difficult. Further, since the backing material is injected into the back side of the lining, there is a problem that it is difficult to confirm whether the backing material is sufficiently filled.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a Messel shield machine capable of reliably and efficiently filling concrete between the ground and the inner formwork.

[0010]

According to a first aspect of the present invention, a plurality of messels are arranged in parallel on the outer periphery of a frame with their tips facing forward, and each of these messels expands and contracts in the front-rear direction. In the Messel Shield machine that constructs the lining by striking fresh concrete in the space defined by the inner formwork and the wife formwork that are assembled inside the rear part of the Messel, while supporting each through the And a tail blade connected to each other in the front-rear direction so as to be movable relative to each other, a means for driving the tail blade forward, and a means for connecting the tail blade and the end form.

According to a second aspect of the present invention, the forward drive means comprises a winch supported by a frame, a wire rope wound around the winch, and a pulley attached to the front of the messel. Is connected to the tail blade via this pulley.

According to a third aspect of the present invention, a tail seal is attached to the outer periphery of the rear end of the tail blade, the tip of which abuts against the surrounding ground.

According to a fourth aspect of the present invention, a plurality of messels are arranged in parallel on the outer periphery of the frame with their front ends facing forward, and these messels are respectively attached to the frame via jacks that extend and retract in the front-back direction. While supporting, in a Messel shield machine that constructs a lining by striking ready-mixed concrete in the space defined by the inner formwork and wife formwork that are assembled inside the rear of the Messel, move relative to the Messel in the front-back direction A tail blade that is freely connected,
It comprises means for driving the tail blade forward and a jack supported by a frame for moving the end form in the front-rear direction.

[0014]

According to the first aspect of the invention, the tail blade connected to the end form is pulled rearward as the messel advances, and the space between the end form and the messel is secured against the natural pressure. Protect. Concrete is placed in the space surrounded by the existing lining in the rear, the gable form, the inner form and the ground,
Since it directly cuts into the natural ground, it is possible to construct a high-quality lining that does not require injection of backing material. When assembling the formwork in the next section, the connecting means is released and the tail blade is advanced by the drive means, and the end formwork is connected at the advanced position to assemble the inner formwork.

According to the second aspect of the invention, the winch winds up the wire rope connected to the tail blade through the pulley at the front of the messel, whereby the forward moving means can be simply constructed.

According to the third aspect of the invention, the tail seal attached to the outer periphery of the rear end of the tail blade prevents fresh concrete from entering the gap between the tail blade and the ground.

In the invention according to claim 4, since the jack presses the placed concrete through the gable form, the concrete is compacted and dehydration is accelerated, so that the hardening time is shortened and the lining is also provided. Adheres well to the ground.

[0018]

1 to 5 show an embodiment of the present invention.

In the shield machine shown in FIG. 1, the messel 1 is supported via a front jack 8 on the outer periphery of a frame 7 having a cross section substantially similar to the excavated cross section of a tunnel. The messel 1 is a strip-shaped member, and a plurality of messels 1 are arranged along the outer periphery of the frame 7 with the tip facing forward in parallel with the tunnel axis, and move forward and backward in response to expansion and contraction of the front jack 8. Reference numeral 9 is a bracket for connecting the front jack 8 to the messel 1.

The messel 1 is provided with a hollow holder 3 as shown in FIG. 2, and the tail blade 2 is provided inside the holder 3.
Is freely slidable in the front-back direction.

In the vicinity of the top of the tunnel cross section, as shown in FIG.
As shown in FIG. 3, one tail blade 2 is provided corresponding to the three messels 1, and the three divided front portions of the tail blades 2 are inserted into the holders 3 of the respective messels 1. On both sides thereof, one tail blade 2 is provided corresponding to the two messels 1, and the front part of the tail blade 2 divided into two is inserted into the holder 3 of each messel 1. For the other Messel 1, one tail blade 2 is combined with each other.

One end of a wire rope 5 is connected to the front portion of the tail blade 2 located inside the holder 3. This wire rope 5 is wound up on an electric winch 6 as a driving means fixed inside the frame 7 via a pulley 4 attached to the tip of the messel 1. As shown in FIG. 2, the tail blade 2 is integrally formed with a gable form mounting plate 11 on the inner periphery of the rear end, and on the outer periphery of the rear end, there is a tail seal 12 made of a wire brush that abuts the tip against the ground. A boom cutter 10 for excavating a face is housed inside a frame 7 attached in two steps.

As the shield machine advances, the mold is assembled inside the tail blade 2 and the lining concrete is cast using the assembled mold.

The formwork comprises an inner formwork 13 and an end form 14 as shown in FIG. The gable formwork 14 is attached to the gable formwork mounting plate 11 provided at the rear end of the tail messel 2 by a bolt 1 as a coupling means.
It is fixed at 9, and further fixed to the inner formwork 13 by another bolt. As shown in FIG. 4 (e), the inner mold 13 is provided with an injection port 15 for ready-mixed concrete.

Next, the operation will be described.

This shield machine constructs a tunnel while excavating a face by the boom cutter 10, propelling the messel 1 and placing lining concrete in the order shown in FIGS. 4 (a) to 4 (e). .

FIG. 4A shows a state where the boom cutter 10 is excavating a face. Tail blade 2 is Messel 1
The gable formwork 14 is fixed to the gable formwork mounting plate 11 and the inner formwork 13 at the rear end of the tail blade 2, and the lining concrete 16 that has just been cast is cured. There is.

As the excavation progresses, the messel 1 is sequentially pushed forward by the extension drive of the front jack 8. The reaction force associated with the extension of the front jack 8 is supported via the frame 7 by the frictional resistance between the other messel 1 and the natural ground. As shown in FIG. 4B, the tail blade 2 fixed to the end frame 14 remains in the same position as the forward moving Messel 1, and the Messel 1 holds the tail blade 2 in the holder 3 as shown in FIG. Forwards while sending from the rear. At this time, the electric winch 6 is held in the released state, and the wire rope 5 is sent out from the electric winch 6 as the messel 1 advances.

After advancing all the messels 1, all the front jacks 8 are contracted at the same time, as shown in FIG.
The frame 7 is advanced as shown in FIG. The reaction force due to the contraction of the front jack 8 is supported by the frictional resistance between all the messels 1 at the forward position and the natural ground.

After this, the rear inner formwork 13 is removed, and the front inner formwork 13 is transported and assembled. At the same time, the wife form 14 is also removed and transported forward.

Next, the electric winch 6 is operated to pull the tail blade 2 forward through the wire rope 5, and the tail blade 2 is moved forward until the rear end thereof reaches the front edge position of the newly assembled inner frame 13. Let Along with this, the front portion of the forward-moving tail blade 2 deeply enters the inside of the holder 3.

Then, the end form 14 is attached to the front surface of the newly assembled inner form 13, and the end form 14 is fixed to the end form mounting plate 11 of the tail blade 2 with bolts 19. As a result, as shown in FIG. 4D, a region 17 surrounded by the end form 14, the existing lining concrete 16, the inner form 13, and the ground is formed.

As shown in FIG. 4 (e), fresh concrete is poured into the area 17 from a charging port 15 provided in the inner mold 13 at a predetermined pressure, and a new lining concrete 18 is poured. Since the region 17 faces not the tail blade 2 but the ground, the injected concrete directly digs into the ground and is filled between the ground and the inner formwork 13 without leaving a void. Therefore, it is not necessary to inject the backing material again.

Since the gap between the natural ground and the tail blade 2 is blocked from the area 17 by the tail seal 12 arranged at the rear end of the tail blade 2, the injected fresh concrete is mixed between the natural ground and the tail seal 12. There is no fear of breaking in between.

Since the tunnel construction work for one span is completed by the above steps, returning to FIG. 4A again, the same work is repeated.

In this way, the lining can be constructed efficiently without injecting the backing material.

FIG. 5 shows a second embodiment of the present invention. Here, without fixing the gable form 14 to the tail blade 2,
It is supported by a plurality of telescopic jacks 20 attached to the frame 7. The expansion jack 20 expands and contracts in the front-rear direction and presses the end mold frame 14 rearward to press the ready-mixed concrete put into the area 17.

According to this structure, the fresh concrete put into the region 17 adheres well to the ground, and the consolidation is promoted, so that a high-strength lining can be constructed. Further, since the dehydration and hardening are accelerated due to the consolidation, the hardening time is shortened and the time required for one cycle can be shortened.

[0039]

As described above, according to the invention described in claim 1, concrete is placed in the space surrounded by the existing rear lining, the end form, the inner form and the ground. The concrete digs into the ground well, and a good lining can be constructed without the injection of backing material.

According to the second aspect of the present invention, since the wire rope wound around the winch is connected to the tail blade via the pulley at the front of the Messel, the means for moving the tail blade can be simply constructed.

According to the third aspect of the present invention, the tail seal attached to the outer periphery of the rear end of the tail blade prevents the entry of fresh concrete into the gap between the tail blade and the ground, so that the introduced raw material is injected. Concrete is filled in a predetermined area without any gap, and a good quality lining can be constructed.

According to the invention described in claim 4, since the jack presses the placed concrete through the gable form, the concrete is compacted and dehydration is accelerated, so that the curing time is shortened and at the same time, The lining adheres well to the ground.

Therefore, the present invention has a great effect in improving the quality of the lining and shortening the construction time.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a shield machine showing an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of essential parts of the messel and the tail blade.

FIG. 3 is a transverse sectional view of the shield machine.

FIG. 4 is a vertical cross-sectional view of a main part of the shield machine, which sequentially shows excavation work by the shield machine and placement work of lining concrete.

FIG. 5 is a vertical cross-sectional view of a main part of a shield machine showing another embodiment of the present invention.

[Explanation of symbols]

 1 Messel 2 Tail Blade 4 Pulley 5 Wire Rope 6 Winch 7 Frame 8 Front Jack 12 Tail Seal 13 Inner Form 14 Gable Form 19 Bolt 20 Telescopic Jack

Claims (4)

[Claims] 1. A plurality of messels are arranged in parallel on the outer periphery of the frame with their tips facing forward, and each of these messels is supported by the frame via jacks that extend and retract in the front-rear direction, while In a Messel shield machine that constructs a lining by striking ready-mixed concrete in a space defined by an inner formwork and an inner formwork assembled inside, a tail blade that is freely movable in the front-rear direction relative to the Messel And a means for driving the tail blade forward, and a means for connecting the tail blade and the end form to each other, the Messel shield machine. 2. A winch whose forward drive means is supported by a frame, and a wire rope which is wound around the winch.
2. The Messel shield machine according to claim 1, which is a pulley attached to a front portion of the Messel, and the wire rope is connected to a tail blade through the pulley. 3. The Messel shield machine according to claim 1, wherein a tail seal is attached to the outer periphery of the rear end of the tail blade, the tip of which abuts against the surrounding ground. 4. A plurality of messels are arranged in parallel on the outer periphery of the frame with their tips facing forward, and each of these messels is supported by the frame via a jack that expands and contracts in the front-rear direction, while at the rear of the messels. In a Messel shield machine that constructs a lining by striking ready-mixed concrete in a space defined by an inner formwork and an inner formwork assembled inside, a tail blade that is freely movable in the front-rear direction relative to the Messel 2. The Messel shield machine according to claim 1, further comprising: a means for driving the tail blade forward, and a jack supported by a frame that moves the end form in the front-rear direction.