JPH062488A - Recycle method for shield-excavated surplus soil - Google Patents

Abstract

PURPOSE:To decrease the amount of residual soil generated from a site with shield excavation by modifying the residual soil containing much fine grains, filling therewith the part under a concrete plate in the lower part of a tunnel segment having undergone a covering process, and thereby constructing an invert. CONSTITUTION:A solidifying material, water, and fluidizing agent are added to a residual soil from shield excavation containing much fine grains, and they are mixed together to achieve modifying, and invert injection material G, G is prepared. From a residual soil injecting hole 30 provided in a concrete plate 26, this invert infection material G is poured fully into the space under the concrete plate 26 laid stretched over the lower part of a tunnel segment 20 which has undergone a covering process, and an invert F is built. Otherwise, the residual soil modified in this manner is cast into the lower part of the tunnel segment 20 having undergone the covering process and compacted to produce a horizontal finished surface, and a concrete part is provided on its oversurface to build an invert F.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recycling shield excavation residual soil.

[0002]

As is well known, a large amount of excavated soil is generated in the shield excavation method.

[0003]

At present, the shield excavation residual soil is treated as industrial waste or sludge and is treated at the final disposal site, depending on the type of shield construction method.
The cost required for that is very large.

It is an object of the present invention to provide a method for recycling shield excavation residual soil which reduces the amount of residual soil generated on site.

[0005]

According to the present invention, solidified material, water, and a fluidizing agent are added to and mixed with the shield excavation residual soil containing a large amount of fine particles, and the mixture is reformed. The invert is constructed by pouring and filling the space below the stretched concrete plate.

Further, according to the present invention, the shield excavation residual soil containing a large amount of coarse particles is put into the lower portion of the lined tunnel segment, compacted and finished to a horizontal surface, and a concrete portion is provided on the finished upper surface to construct an invert. It is characterized by doing.

[0007]

In the method of the present invention, the amount of residual soil generated from the site can be reduced by modifying the shield excavation residual soil into a material that can be used for invert construction.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a residual soil recycling facility common to the muddy water shield machine A and the earth pressure shield machine B embodying the present invention.

When excavating with the muddy water shield machine A, muddy water is pumped (mud) to the entire face of the face, the face of the face is stabilized by the water pressure, and the face is excavated to discharge the muddy water containing the earth and sand. The sludge discharged contains coarse particles of sand, and therefore cannot generally be sent as it is. Therefore, the vibrating sieve 1 separates the particles of sand into fine particles C and coarse particles D.

A part of the fine particles C is sent from the adjusting tank 2 through the muddy water tank 3, and the other part is agglomerated by the aggregating agent in the aggregating agent tank 5 in the slurry tank 4 and then by the filter press 6. It is pressed and sent to the residual soil reforming apparatus 10 via the belt conveyor 7. Further, the coarse particle portion D is sent to the residual soil reforming device 10 via the belt conveyor 8.

On the other hand, the excavated earth E of the earth pressure shield machine B is
It is directly charged into the residual soil reforming apparatus 10 by the screw conveyor 9 or the like.

In the residual soil treatment system of the muddy water shield machine A, when the fine particles C are slurried and filled in the invert F, in order to improve the filling effect, the fluidizing agent tank 1
1 fluidizing agent, water tank 12 water and solidifying material tank 13
Solidifying material (eg cement) is added. Then, the residual soil reforming apparatus 10 is stirred and mixed to form a slurry, and the slurry-inverted injection material G is injected and filled into the invert F by the injection pump 15 through the stock tank 14.

Further, in the case where the slurry is not formed, the fine grain fraction C
The coarse particles D and the coarse particles D are charged into the residual soil reforming device 10 at a predetermined ratio and mixed, and are discharged by the belt conveyor 16 and applied to the recycled residual soil, that is, the compacting material H to be input to the invert F.

In both of the above cases, the fine grain fraction C and the coarse grain fraction D
The control of the input amount and the quality obtained by adding the additives 11 to 13 is automatically performed by the control panel 17 using various sensors and sequences not shown.

On the other hand, in the residual soil treatment system of the earth pressure shield machine B, when the fine particles and the coarse particles are not separated, the earth and sand E carried out does not affect the particle size due to the intended use or the earth and sand E. It is suitable when the strength is uniform and the strength and fluidity can be improved mainly by the additive.

In the case of separation, the excavated earth and sand E has a large amount of coarse particles and is suitable for the case where the application has to be made into a slurry. In this case, before being put into the residual soil reforming apparatus 10, a vibrating screen (not shown) is used. Thus, the fine particles and the coarse particles are separated, and the fine particles are slurried in the same manner as described above to obtain the invert injection material G. Further, the coarse-grained portion is the compaction material H.

The above is summarized as shown in FIGS. 2 and 3. The backfill material in the figure refers to the backfill material for the shaft in the shield work.

FIG. 2 shows a residual soil recycling flow, and first determines whether it can be used as a mixed soil of fine and coarse particles (step S5). Therefore, when it is not possible to use it as mixed soil, it is determined whether or not it is impossible to use the compaction material H (step S8). If it is not possible, slurry processing is performed (step S9). Use (step S21). If it can be used as mixed soil, it is determined whether to make it slurry or solidify (step S6). In the case of slurrying, the process proceeds to step S9, and in the case of solidifying, solidification treatment is performed (step S9
7) At the same time as step S9, the presence or absence of the fluidizing agent is determined (step S10), the presence or absence of the need for water injection is determined (step S12), and the residual soil reforming apparatus 10 is used for reforming (step S15). Then, depending on the presence or absence of fluidization (step S16), the fluidized material is used as the injection material G (step S18), and the unfluidized material is used as the compaction material H (step S21). In this way, as shown in FIG. 3, a material having a large amount of fine particles is slurried to be an invert injection material G, and a material having a large amount of coarse particles is used as a compacting material H. In addition, in the case where the fine particle content and the coarse particle content are mixed, the fine particle content is applied to the injection material G and the other is applied to the compaction material H, with or without separating them.

Next, the mode of invert construction will be described.

When using the invert injection material G,
As shown in FIG. 4, precast plate support haunches 21 are attached to both sides of a predetermined portion of the lined tunnel segment 20. As shown in FIG. 5, the haunch 21 fixes the haunch 21 to the segment 20 by pouring a sheath grout material from the anchor anchoring sheath grout hole 24 into the anchoring cavity 23 around the anchor muscle 22 from the segment 20. In addition, as shown in FIG. 6, the secondary lining concrete 2
The haunch part 25a may be integrally formed when the 5 is placed.

Next, the precast plate 26 (FIG. 7) is placed on both haunches 21, 21. At this time, the front and back openings are formed in the gable form frame 27 configured as shown in FIG.
Block with. The gable form 27 is removed and reused after use. Increasingly, the precast plate 28 with a corrugated portion as shown in FIG. 9 can be used for the precast plate in the closed portion. Also, without providing the haunch 21,
A precast plate 29 having the haunch portions 29a and 29a shown in FIG. 10 can be used. Therefore, the invert injection material G is injected and filled from the residual soil injection hole 30 of the precast plate 26. The injection hole 30 may be provided in a side portion of the end mold form 27 or the end cast precast plate 28, and the invert injection material G may be injected and filled from the side.

When the compacting material H is used, as shown in FIG. 11, the compacting material H is put into the bottom of the tunnel segment 20 and compacted by rolling to form a horizontal surface 31, and then the horizontal surface 31 is formed. Cover with concrete pavement layer 32.
Alternatively, as shown in FIG. 12, the horizontal surface 31 is covered with a precast plate 33.

[0024]

As described above, according to the present invention, the shield excavation residual soil can be used for invert construction, and the amount of residual soil generated at the site can be reduced.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a residual soil recycle facility for carrying out the present invention.

[Fig. 2] Recycle flow diagram for residual soil.

FIG. 3 is a usage classification diagram of residual soil.

FIG. 4 is a perspective view showing an invert construction mode using an invert injection material.

FIG. 5 is a perspective view illustrating a mounting mode of a precast plate supporting haunch.

FIG. 6 is a perspective view illustrating another mounting mode of the precast plate supporting haunch.

FIG. 7 is a perspective view showing an example of a precast plate.

FIG. 8 is a perspective view showing a gable form.

FIG. 9 is a perspective view showing another example of the precast plate.

FIG. 10 is a perspective view showing another example of the precast plate.

FIG. 11 is a perspective view showing an invert construction mode using a compaction material.

FIG. 12 is a perspective view showing another mode of invert construction using a compaction material.

[Explanation of symbols]

 A ... Muddy water shield machine B ... Earth pressure shield machine C ... Fine grain fraction D ... Coarse grain fraction E ... Excavation sediment F ... Invert G ... Invert injection material H ...・ Compacting material 1 ・ ・ ・ Vibration sieve 2 ・ ・ ・ Adjustment layer 3 ・ ・ ・ Muddy water tank 4 ・ ・ ・ Slurry tank 5 ・ ・ ・ Flocculant tank 6 ・ ・ ・ Filter press 7 ・ ・ ・ Belt conveyor 8 ・ ・・ Belt conveyor 9 ・ ・ ・ Screw conveyor 10 ・ ・ ・ Remaining soil reformer 11 ・ ・ ・ Fluidizer tank 12 ・ ・ ・ Water tank 13 ・ ・ ・ Solidification material tank 14 ・ ・ ・ Stock tank 15 ・ ・ ・ Injection pump 16 ... Belt conveyor 21 ... Precast plate support haunch 22 ... Anchor streak 23 ... Fixing cavity 24 ... Anchor fixing sheath grout hole 25 ... Secondary lining concrete 25a ... Haunch Part 2 , 29 and 33 ... precast plates 27 ... wife formwork 28 ... wife unit with precast plate 29a ... haunch portions 30 ... surplus soil injection holes 31 ... horizontal surface 32 ... concrete pavement layer

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Muneo Yoshimura 1-2-7 Moto-Akasaka, Minato-ku, Tokyo Kashima Construction Co., Ltd.

Claims (2)

[Claims] 1. A solid material, water, and a fluidizing agent are added to and mixed with the shield excavation residual soil containing a large amount of fine particles to modify the soil, and the mixture is injected into the space below the concrete plate stretched under the lining tunnel segment. A method for recycling shield excavation residual soil, which is characterized by filling and building inverts. 2. An invert is constructed by throwing the shield excavation residual soil containing a large amount of coarse particles into the lower portion of the lined tunnel segment, compacting and finishing to a horizontal surface, and providing a concrete portion on the finished upper surface. Recycling method of shield excavation residual soil.