JP2758149B2 - Invert structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an invert structure constructed by using a large amount of excavated soil generated in a shield excavation method.

[0002]

2. Description of the Related Art As is well known, a large amount of excavated earth and sand is generated by a shield excavation method. The use of this soil as a subgrade material in a tunnel for effective use is disclosed, for example, in Japanese Patent Publication No. 3-40800. However, according to the prior art, formation of the invert and installation of the support plate after the segment lining could not be performed efficiently.

[0003]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an invert structure which can be efficiently installed in a shield tunnel.

[0004]

According to a first aspect of the present invention, in an invert construction, a fixing cavity is formed in a support haunch for supporting a precast plate provided in a tunnel segment, and a branch is formed in the fixing cavity. A sheath grove hole is provided on the other hand, while an anchor bar is protruded from the segment, the anchor bar is inserted into the fixing cavity, and a sheath grout material is poured into the fixing cavity from the sheath grove hole to support the support haunch. While fixing to the segment,
The precast plate is placed on the support haunch, and an invert injection material is injected and filled from a residual soil injection hole formed in the precast plate.

According to a second aspect of the present invention, in the invert construction, the supporting haunch for supporting the precast plate provided in the tunnel segment is formed integrally with the secondary lining concrete formed in the tunnel segment. It is characterized in that a precast plate is placed thereon and an invert injection material is injected and filled from a residual soil injection hole formed in the precast plate.

According to a third aspect of the present invention, in the invert structure, a precast plate integrally provided with a haunch portion on both lower sides is placed on the inner wall of the lining tunnel segment, and the precast plate is perforated. It is characterized by injecting and filling an invert injection material from a residual soil injection hole.

[0007]

According to a fourth aspect of the present invention, in the above-mentioned invert structure, a wife portion is provided integrally with the precast plate.

[0009]

[0010]

In the invert structure according to claim 1,
The support haunch pours the sheath grout material from the sheath grove hole, fixes the support haunch to the segment, places a precast plate on the support haunch, and further, at the lower part of the precast plate, inverts the inversion injection material from the residual soil injection hole. Fill and fill.

According to the second aspect of the present invention, the supporting haunch is formed integrally with the supporting haunch when the secondary lining concrete is poured, and a precast plate is placed on both the supporting haunches. The invert injection material is injected and filled.

In the invert construction according to the third aspect, a precast plate integrally provided with a haunch portion on both lower sides on a segment is placed on the segment, and an invert injection material is injected and filled from a residual soil injection hole.

[0013] In the invert construction according to the fourth aspect, in addition to the above operation, the invert injection material is held under the precast plate.

[0014]

[0015]

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

First, a brief description will be given of a method for recycling shield excavated soil, which is a premise of the present invention.

FIG. 7 shows a waste 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 mud shield machine A, the mud is pumped over the entire face (mud sending), the excavation is performed by stabilizing the face by the water pressure, and mud containing soil and sand from the ground is discharged. Since the discharged matter contains coarse-grained sediment, it is generally impossible to feed the mud as it is. Therefore, the vibrating sieve 1 separates the sediment into fine particles C and coarse particles D.

A part of the fine particles C is fed from the adjusting tank 2 through the muddy water tank 3, and the other part is coagulated by the coagulant in the coagulant tank 5 in the slurry tank 4. It is pressed and sent to the residual soil reformer 10 via the belt conveyor 7. The coarse particles D are sent to the residual soil reformer 10 via the belt conveyor 8.

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

When the fine particles C are slurried and charged into the invert F in the residual soil treatment system of the muddy water shield machine A, in order to improve the filling effect, the fluidizer tank 1 is used.
1 fluidizer, water in the water tank 12 and solidified material tank 13
(For example, cement) is added. Then, the mixture is stirred and mixed in the residual soil reforming apparatus 10 to form a slurry, and the slurried invert injection material G is injected and filled into the invert F by the injection pump 15 via the stock tank 14.

When the slurry is not formed, the fine particles C
And the coarse particles D in a predetermined ratio into the residual soil reforming apparatus 10 and mixed, and then carried out by the belt conveyor 16 and applied to the recycled residual soil, that is, the compacted material H to be charged into the invert F.

In both of the above cases, the fine grain fraction C and the coarse grain fraction D
And the control of the quality obtained by the addition of the additives 11 to 13 are 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 shielding machine B, when the fine and coarse particles are not separated, the conveyed earth and sand E may not be affected by the particle size depending on the intended use or the earth and sand E Is suitable when strength and fluidity can be improved mainly by additives.

In the case of separation, the excavated earth and sand E has a large amount of coarse particles and is suitable for a case where the application needs to be slurried. By this, fine particles and coarse particles are separated, and the fine particles are slurried in the same manner as described above to obtain an invert injection material G. Further, the coarse particles are used as the compaction material H.

Next, an embodiment of an invert structure according to the present invention will be described.

The construction of the inner wall of the tunnel by the segment will not be described again since a known means is adopted. First, support haunches 21, 21 for supporting a precast plate arranged at a fixed height position in a tunnel from below.
Will be described.

The first embodiment shown in FIG. 1 shows a tunnel having a circular cross section which is lined underground, and a precast plate is provided on both sides of a place where the precast plate 26 in the segment 20 constituting the tunnel is to be supported. The support haunches 21, 21 for supporting the lower end 26 at the lower ends thereof are mounted.

As shown in FIG. 2, the support haunches 21 and 21 are provided with a fixing cavity 23 and a sheath glow hole 24 communicating with the fixing cavity 23 in advance.
In attaching the segments 1 and 21 to the segment 20, the anchor muscles 22 provided in advance in the segment 20 are inserted into the anchoring cavity 23, and then the sheath gliding material is poured from the sheath anchoring hole 24 for anchor anchoring. The haunches 21 and 21 are fixed to the segment 20.

According to this means, the mounting of the supporting haunches 21 and 21, which are heavy objects, to the segment 20 is performed by the supporting haunch 2.
After temporarily locking the anchors 1 and 21 to the anchor streaks 22 and temporarily supporting them, and fixing them to the segments 20 by pouring a sheath grout material, the number of workers is small and not only the workability is good, but also the work is easy. Extremely easy. It is possible to slightly adjust the position of the support haunches 21 for a short time after pouring the sheath grout material.

FIG. 3 shows a second embodiment of the means for attaching the support haunch portions 25a, 25a. After laying a tunnel with a circular cross section, concrete 2 for secondary lining
5, the supporting haunch portion 25a is integrally formed stepwise symmetrically in the left-right direction.

According to this means, since the work can be performed simultaneously with the placing of the concrete 25 for the secondary lining, not only the work efficiency is good but also the stable supporting haunch portion 25 is provided.
a, 25a can be attached.

Next, the precast plate 26 shown in FIG. 4 is placed on the support haunches 21, 21 or the support haunch portions 25a, 25a. In the precast plate 26, a residual soil injection hole 30 is previously formed in a direction penetrating vertically. In this mounting, the front and rear openings of the precast plate 26 are closed.

This is to prevent the invert injection material G from flowing out of the opening when the inversion injection material G is injected from the residual soil injection hole 30 as described later. For this purpose, it is preferable to use a precast plate 28 with a wedge as shown in FIG.

In the above embodiment, the precast plate 2
6, the support haunch 21 or the support haunch portion 25a
The segments 20 are provided, but these haunches are not separately provided, and as shown in FIG.
By using the precast plate 29 provided with 9a in advance, the number of components can be reduced and workability can be improved.

After the precast plate 26 is placed in the tunnel as described above, the invert injection material G is injected and filled through the residual soil injection hole 30 formed in the precast plate 26. In addition, the residual soil injection hole 30 may be provided on the side of the preform plate 28 or the precast plate 28 with the wedge part, and the invert injection material G may be injected and filled from the side.

[0037]

[0038]

As described above, according to the inventions described in the respective claims, the following excellent effects can be obtained. (1) Inverted structures can be formed by using shield excavated soil for inverting. (2) According to the first aspect of the present invention, since the supporting haunch which is a heavy object is attached to the segment, the supporting haunch is temporarily supported on the anchor muscle, and the sheath grout material is poured thereinto. Not only the workability is good, but the work is extremely easy. After pouring the sheath glow material, the position of the support haunch can be slightly adjusted for a short time. (3) According to the second aspect of the present invention, the installation of the supporting haunch can be performed simultaneously with the placement of the concrete for the secondary lining, so that not only the work efficiency is high but also the stable support is provided. The haunch can be attached. (4) According to the third aspect of the present invention, since the precast plate integrally provided with the haunch portions on both lower sides of the precast plate is placed on the segment, the number of parts is reduced during construction and workability is improved. Improvement can be achieved. (5) According to the invention described in claim 4, claims 1 to 3 are provided.
In addition to the effect of the invention described, the invert injection material does not flow out from the lower part of the precast plate during the injection and filling.

[Brief description of the drawings]

FIG. 1 is a perspective view of an invert structure showing an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a mounting mode of the support haunch of the embodiment.

FIG. 3 is a perspective view of an invert structure showing a second embodiment of the present invention.

FIG. 4 is a perspective view showing an example of a precast plate used in the embodiment of the present invention.

FIG. 5 is a perspective view of a precast plate with a wive used in the embodiment of the present invention.

FIG. 6 is a perspective view showing another example of a precast plate used for carrying out the present invention.

FIG. 7 is an overall configuration diagram showing a recirculating soil facility for carrying out the present invention.

[Explanation of symbols]

 A: muddy water shield machine B: earth pressure shield machine C: fine grain fraction D: coarse grain fraction E: excavated sediment F: invert G: invert injection material 1.・ Vibration sieve 2 ・ ・ ・ Adjustment layer 3 ・ ・ ・ Muddy water tank 4 ・ ・ ・ Slurry tank 5 ・ ・ ・ Coagulant tank 6 ・ ・ ・ Filter press 7 ・ ・ ・ Belt conveyor 8 ・ ・ ・ Belt conveyor 9 ・ ・ ・Screw conveyor 10 ・ ・ ・ Remaining soil reformer 11 ・ ・ ・ Fluidizer tank 12 ・ ・ ・ Water tank 13 ・ ・ ・ Solidified material tank 14 ・ ・ ・ Stock tank 15 ・ ・ ・ Injection pump 16 ・ ・ ・ Belt conveyor 21 ... Precast plate support haunch 22 ... Anchor streaks 23 ... Anchoring cavity 24 ... Sheet ground hole for anchor anchoring 25 ... Secondary lining concrete 25a ... Support haunch portion 26,29 ...・Rekyasuto plate 28 ... wife unit with precast plate 29a ... supporting haunch portions 30 ... residual soil injection hole

Continued on the front page (72) Inventor Muneo Yoshimura Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 11/10

Claims (4)

(57) [Claims] An anchoring cavity is formed in a support haunch for supporting a precast plate provided in a tunnel segment, and a branching hole is provided in the anchoring cavity to form a sheath grove hole. Inserting the anchor streaks into the fixing cavity, pouring a sheath grout material into the fixing cavity from the sheath grove hole to fix the support haunch to the segment, and placing the precast plate on the support haunch. And an invert injection material is injected and filled from a residual soil injection hole formed in the precast plate. 2. A support haunch for supporting a precast plate provided in a tunnel segment is formed integrally with a secondary lining concrete formed in the tunnel segment, and a precast plate is placed on the support haunch and a precast plate is provided. An invert structure, wherein an invert injection material is injected and filled through a residual soil injection hole formed in the soil. 3. A precast plate integrally provided with haunches on both lower sides on the inner wall of a lining tunnel segment, and an invert injection material is injected and filled from a residual soil injection hole formed in the precast plate. Inverted structures characterized by: 4. The invert structure according to claim 1, wherein a wife portion is provided integrally with the precast plate.