JP2642822B2 - Backfill material and method of manufacturing backfill material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backfill material used for backfilling an existing tunnel that is no longer needed, and a method of manufacturing the backfill material.

[0002]

2. Description of the Related Art When underground development has not progressed so much, another existing tunnel has hardly been an obstacle when excavating a new tunnel.

[0003]

However, as underground development progresses, the existence of old tunnels may hinder the excavation of new tunnels, and it becomes necessary to refill such old unnecessary tunnels. .

In view of the above circumstances, an object of the present invention is to provide a backfill material used for backfilling an unnecessary existing tunnel and a method of manufacturing the backfill material.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a backfill material used for backfilling unnecessary tunnels, comprising a base material made of water, sand and clay, a binder made of water and cement, and a quick-setting material. Are mixed.

[0006] The present invention also provides a base material by kneading water, sand and clay, kneading water and cement,
A binder is generated, the generated base material and the binder are kneaded, and a quick-setting material is added to the kneaded base material and the binder.

Further, the present invention provides a backfill material used for backfilling an unnecessary tunnel, comprising a base material made of water, sand, clay and a thickener, and a binder made of water, cement and quick-setting material. Are mixed.

[0008] The present invention also relates to a method of kneading water, sand and clay, adding a thickener to the kneaded water, sand and clay to form a base material, kneading water and cement, A quick-setting material is added to the kneaded water and cement to form a binder, and the generated base material and binder are kneaded.

The numbers and the like in parentheses indicate the corresponding elements in the drawings for convenience, and therefore, the present description is not limited to the description on the drawings. The same applies to the following “action” column.

[0010]

With the above construction, the backfill material has a high fluidity at the time of filling and acts so as to develop a predetermined initial strength early after filling.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are diagrams showing a replacement shield and a tunnel backfilling process using the replacement shield.
FIG. 5 is a view of the replacement shield shown in FIG. 1 as seen from the direction of the arrow V. FIG. 6 is a view showing an example of the basic composition of the backfill material.
FIG. 8 shows a change in the composition of the backfill material according to the temperature condition shown in FIG. 8, FIG. 8 shows an example of the components of the clay mixed into the backfill material shown in FIG. 6 or FIG. 7 is a diagram showing an example of the components of the quick setting material mixed in the backfill material, FIG. 10 is a diagram showing the required performance for the backfill material shown in FIG. 6 or 7, and FIG. 11 is a diagram in FIG. 7 is a diagram showing the relationship between the compressive strength of the backfill material of the composition shown in FIG. 7 and the time after filling, and FIG. 12 is a diagram showing the relationship between the compressive strength of the backfill material of the formulation shown in FIG. 6 or 7 and the kneading time; 13 is a diagram showing another example of the basic composition of the backfill material, FIG. 14 is a diagram showing the required performance for the backfill material shown in FIG. 13, and FIG. It is a figure which shows the relationship between compressive strength and time after filling.

The existing tunnel 50 to be backfilled is shown in FIG.
Alternatively, as shown in FIG. 5, a cylindrical segment 51 having a length of one ring L and a secondary lining 52 formed inside thereof.
Thus, it is constructed so as to extend in the directions of arrows C and D (the direction of the axial center CT). The segment 51 is formed in a cylindrical shape in a shape in which a plurality of segment pieces 51a are assembled in the direction of the axis CT and in the circumferential direction around the axis CT, and opposes the earth pressure and water pressure of the ground 60. ing.

As shown in FIG. 1, the replacement shield 1 used for backfilling the tunnel 50 has an outer shell 2 formed in a cylindrical shape, and a front end 2a of the outer shell 2 (in the figure). The left part) is provided with an excavator 7 including a cutter (face plate) 7a, a driving device 7b, and the like. That is, the partition 3 formed in an annular shape is provided inside the outer shell 2. An inner cylinder 5 having a cylindrical shape whose inner diameter is substantially the same as the outer diameter of the tunnel 50 is provided inside the partition 3, and a sealing device ( (Not shown). In front of the partition wall 3 (left side in the figure), an annular shape having an outer diameter substantially equal to the outer diameter of the outer shell 2 and an inner diameter substantially equal to the outer diameter of the tunnel 50 is formed. The formed cutter 7a is provided toward the front of the outer shell 2 (to the left in the drawing). The cutter 7a is connected to a driving device 7b composed of a hydraulic motor or the like so as to rotate the cutter 7a in directions indicated by arrows E and F in FIG.

A plurality of propulsion jacks 6 are arranged in an annular array along the outer shell 2 behind the partition wall 3 (right side in FIG. 1). 6a
Are provided so as to protrude and retreat in the directions of arrows C ′ and D ′. Further, inside the outer shell 2, a tail partition wall 9 behind the propulsion jack 6 (to the right in the drawing) blocks the space inside the outer shell 2 in the front-rear direction (the left-right direction in the drawing). The shell 2 is provided movably in the directions of arrows C and D. The tail partition 9 is provided with the backfill material casting pipe 10 and the discharge port 1.
0a is connected to the rear of the tail partition wall 9 (to the right in the figure).

The replacement shield 1 has a gripper base 11, and a partition connector 12 is provided on the gripper base 11. The partition wall connector 12 is formed in a cylindrical shape so as to be movable in the directions of arrows C and D in the tunnel 50, and the partition wall connector 12 has a rear end 1.
2a is provided via a pin 9b so as to be detachable from a connecting portion 9a fixed to the tail partition wall 9. And
Outside the partition wall connector 12, a segment connector 13 is provided.
The ram 15a is provided to be movable in the directions of arrows C "and D" with respect to the bulkhead connector 12 via a hydraulic jack 15 fixed to the front end 12b of the bulkhead connector 12.
The segment connector 13 includes the tunnel 50.
Contact plate 16 formed in an arc shape corresponding to the inner diameter of
5 are provided via a hydraulic jack 17 so as to protrude and retreat in the directions of arrows G and H in FIG.

A plurality of core cutters 19 are provided outside the partition connector 12 on the right side of the segment connector 13 in FIG.
Are movable in the direction of the axis CT with respect to the bulkhead connector 12 and in the circumferential direction around the axis CT by arrows G and H (with respect to the axis CT) via a hydraulic cylinder or the like. It is provided so as to protrude and retreat in the radial direction (only one core cutter 19 is shown in the drawing). Further, on the outside of the bulkhead connector 12, a U-shaped segment gripping and crushing device 20 opened to the right of the core cutter 19 in FIG. The connector 12 is swingably driven in the directions of arrows I and J via a hydraulic cylinder or the like so as to be movable in the direction of the axis CT and in the circumferential direction around the axis CT. .

Since the existing tunnel 50 and the replacement shield 1 to be backfilled have the above-described configurations, when backfilling the existing tunnel 50 with the replacement shield 1, first, the segment 51 of the tunnel 50 must be removed from a shaft or the like. The outer ground 60 is excavated by hand digging or mechanical digging so as to correspond to the outer diameter of the outer shell 2 of the replacement shield 1. Then, replace the shield 1
As shown in FIG. 1, the front end 2 a of the outer shell 2, the cutter 7 a of the excavator 7, and the inner cylinder 5
Is installed at the rear end (right end in the figure) of the tunnel 50. That is, the replacement shield 1 is installed so that the outer shell 2 surrounds the outside of the segment 51 of the tunnel 50 to be backfilled, with the cutter 7a of the excavator 7 arranged outside the segment 51. At this time, the tunnel 50 is blocked in the front-rear direction (the left-right direction in the figure) by the tail partition wall 9. Also, the gripper base 11 of the replacement shield 1 is installed inside the tunnel 50 in front of the tail partition 9 (left side in the figure).

When the replacement shield 1 and the like are installed in the tunnel 50, the ground 60 outside the segment 51 is excavated by the cutter 7a and
Is moved forward, and the outer shell 2 and the tail partition wall 9 oppose the pressure of the ground 60 and the back-filled portion 57, and inside the outer shell 2, the segments 51 and The secondary lining 52 inside is dismantled and removed, and the tail partition 9 is further divided into segments 5.
The first and secondary linings 52 are advanced to the unrefilled portion 55 of the removed tunnel 50, and the backfill material 56 is pressed into the refilled portion 57 behind the tail partition wall 9 to refill the tunnel 50. go.

First, as shown in FIG.
1 is moved inside the tunnel 50 in the direction of arrow D, and the rear end portion 12a of the bulkhead connector 12 is connected to the connection portion 9a of the tail bulkhead 9 via the pin 9b. And the hydraulic jack 17
The segment connector 13 is fixed to the segment 51 and the secondary lining 52 by projecting the ram 17a in the direction of arrow G and pressing the contact plate 16 against the inner peripheral surface 52a of the secondary lining 52. . Then, the partition connection 12 is connected to the segment 5 via the segment connection 13 and the hydraulic jack 15.
Fixed to the primary and secondary linings 52 and the bulkhead connector 12
Through the tail partition 9 through the segment 51 and the secondary lining 5
Fixed to 2.

Next, pressurized muddy water is supplied from a mud feed pipe (not shown) to the left of the partition wall 3 in FIG.
The cutter 7a of the excavator 7 is rotationally driven in the direction of the arrow E (or F) in FIG. At the same time, the ram 6a of each propulsion jack 6
Like the propulsion jack 6 shown in the lower part of FIG.
In order to obtain a reaction force from the tail partition 9 fixed to the secondary lining 52, the cutter 7 a is cut through the cutting blade 60 through the partition 3.
Press in the direction a, that is, the direction of arrow C. Then, due to the pressing force, the cutter 7a and the face 60a come into contact with each other at a predetermined contact pressure, and the face 60a is excavated by the cutter 7a, and
The hole 60b is formed in an annular shape outside the segment 51 in a shape corresponding to the shape of. At the same time, the outer shell 2 (and the partition wall 3, the inner cylinder 5, etc.) advances in the direction of arrow C in such a manner as to be inserted into the excavated hole 60b. At this time, the water between the inner cylinder 5 and the segment 51 is stopped by a sealing device (not shown) provided on the inner peripheral surface of the inner cylinder 5.

When the outer shell 2 advances by the length L of one ring of the segment 51 of the tunnel 50, the ram 6a of the propulsion jack 6 projects in the direction of arrow D 'as shown in FIG. Also, the tail partition 9 fixed to the segment 51 and the secondary lining 52 is located at the rear end 2b of the outer shell 2, and furthermore, the tail partition 9 at the rearmost position (rightmost in the drawing) of the tunnel 50. Each segment piece 51aA
(Note that the code “A” added after the code “51a”,
"B" indicates a specific segment piece 51a among the plurality of segment pieces 51a. ) Protrudes from the inner cylinder 5 toward the tail partition wall 9. In this state, the advancement of the outer shell 2 by the propulsion jack 6 is stopped, and the cutter 7 is stopped.
The excavation of the ground 60 by a is stopped.

Then, the last segment piece 51a
A is disassembled and removed in the circumferential direction with respect to the axis CT integrally with the secondary lining 52 inside the segment piece 51aA. That is, the joint bolt between the last segment piece 51aA and the adjacent segment piece 51a is cut via the core cutter 19 installed on the partition wall connector 12 or the like. Then, the segment gripping and crushing device 20 is swung in the directions of arrows I and J while the segment piece 51aA and the secondary lining 52 from which the joint bolts have been cut are integrally gripped by the segment gripping and crushing device 20. Then
The segment piece 51aA and the secondary lining 52 are broken in a bent form and dismantled and removed.

Segment piece 51aA and secondary lining 5
2 is removed, as shown in FIG.
B and the secondary lining 52 inside thereof. Next, the ram 17a of the hydraulic jack 17 is retracted in the direction of the arrow H to release the contact state between the contact plate 16 and the inner peripheral surface 52a of the secondary lining 52, and the partition wall via the pin 9b. The connection state between the rear end portion 12a of the connector 12 and the connection portion 9a of the tail partition 9 is released. Then, the gripper base 11 is moved inside the tunnel 50 in the direction of arrow C to the opposite side of the tail partition wall 9. Then, the rear end portion 1 of the cylindrical partition wall connector 12 is formed.
2a is opened, passes through the inside of the bulkhead connector 12, and the tail bulkhead 9 side (right side in the figure) behind the gripper base 11,
Since it becomes possible to move between the gripper base 11 and the shaft located on the left side in the drawing, the segment piece 51aA and the secondary lining 52 disassembled and removed as described above are connected to the inside of the bulkhead connector 12. The gripper gantry 11 is moved to the left in the drawing via a monorail 22 or the like passing through the trolley, and is loaded on a bogie or the like, and is further carried out to a shaft located on the left in the drawing.

Segment piece 51aA and secondary lining 5
2 is carried out, as shown in FIG.
1 is moved inside the tunnel 50 in the direction of arrow D, and the bulkhead connector 12 and the tail bulkhead 9 are again moved to the rear end 12.
a, the pin 9b, and the connection portion 9a. On this occasion,
The ram 15a of the hydraulic jack 15 between the partition connector 12 and the segment connector 13 of the gripper base 11 is retracted in the direction of the arrow D ", and the segment connector 13 is located on the front side of the partition connector 12, that is, on the opposite side of the tail partition 9. Then, as shown in Fig. 1, the ram 17a of the hydraulic jack 17 is protruded in the direction of arrow G, and the contact plate 16 is pressed against the inner peripheral surface 52a of the secondary lining 52. , The segment connector 13 is fixed to the segment 51 and the secondary lining 52, and the hydraulic jack 15 and the bulkhead connector 1 are fixed.
2, the tail partition 9 is fixed to the segment 51 and the secondary lining 52.

Next, the ram 6a of each of the propulsion jacks 6 pressing the tail partition wall 9 is retreated in the direction of arrow C 'and separated from the tail partition wall 9 like the propulsion jack 6 shown in the upper part of FIG. Then, the ram 15a of the hydraulic jack 15 between the bulkhead connector 12 and the segment connector 13 is pointed by the arrow C ".
To the segment connector 13 fixed to the segment 51 and the secondary lining 52 so that the partition connector 1
2 is moved in the direction of arrow C to advance the tail partition 9 connected to the partition connector 12 to the unfilled portion 55 of the tunnel 50 from which the segment piece 51aA has been removed. Then, simultaneously with the advance of the tail partition 9, muddy water is filled from a mud feed pipe (not shown) provided in the tail partition 9 into the back-filled portion 57 behind (to the right in FIG. 1) the tail partition 9. When the tail partition 9 moves forward by the length L of one ring of the segment 51 of the tunnel 50, the movement of the tail partition 9 in the direction of arrow C by the hydraulic jack 15 is stopped. At this time, the tail partition 9 is provided with the ram 6a of the propulsion jack 6 shown in the upper part of FIG.
As described above, each of the propulsion jacks 6 is advanced to the vicinity of the retreated ram 6a.

Then, as described later, the backfill material 56 is manufactured, and the backfill material 56 is pumped to the backfill material casting pipe 10 provided in the tail partition 9. Then, the backfill material 56 is press-fitted into the backfill portion 57 behind the tail partition wall 9 via the backfill material casting pipe 10, and is filled through a drainage pipe (not shown) provided in the tail partition wall 9. The muddy water is discharged from the return portion 57, and the muddy water is replaced with the backfill material 56.
Is filled in the backfill portion 57. The backfill portion 57 is formed by the tunnel 50 portion from which the segment 51 and the secondary lining 52 have already been removed, and the hole 60b portion formed as the replacement shield 1 advances.

In manufacturing the backfill material 56, first,
Water, sand (silica sand No. 5, silica sand No. 6 or equivalent) and clay are kneaded according to the mixing ratio shown in FIG. 6 to produce a base material. At this time, as the clay, a clay having a component as shown in FIG. 8 (tochikure (trade name) or equivalent) is used. Separately from the base material, water and cement (usually Portland or a material having an equivalent effect) are kneaded in accordance with the mixing ratio shown in FIG. 6 to produce a binder. The base material and the bonding material thus separately generated are separately transported (from a stand existing on the left side of FIG. 1 to the backfilling work position near the replacement shield 1 (transfer by a trolley, pumping by pump, etc.)). . That is, since the quick-setting material is added later as described later, the base material and the binder can be suitably transported even if the distance from the standing up to the back-filling operation position is long. In addition, since the base material is generated and transported separately from the binder,
Pumping can be suitably performed. Then, at the backfilling operation position near the replacement shield 1, the transported base material and the binder are kneaded. Next, the quick-setting material (powder water glass B) was added to the kneaded base material and the binder, as shown in FIG.
The backfill material 56 is manufactured by adding according to the mixing ratio shown in FIG. At this time, as a quick-setting material, powdered water glass B (J2P (trade name) or equivalent) having the components shown in the middle part of FIG. 9 is used.

The mixing ratio of the backfill material 56 shown in FIG.
This is the basic composition when the temperature is 20 ° C., and when the temperature conditions are different, as shown in FIG. 7, the composition ratio (the ratio of the binder, etc.) is changed, and the type of the quick-setting material is changed. . That is,
As the quick setting material, powdered water glass A (J1P (trade name) or equivalent), powdered water glass B (J2P (trade name) or equivalent) of the components shown in FIG. Water glass C (castanica M (trade name) or equivalent) is properly used. The mixing ratio of the backfill material 56 shown in FIGS. 6 and 7 corresponds to the required performance shown in FIG. 10, and the mixing ratio of the backfill material 56 varies when the required performance is different.

The backing material 56 manufactured in this manner is
It has high fluidity at the time of filling by pumping, so that the replacement shield 1
Can be densely filled in the back-filled portion 57 behind.
Then, the backfill material 56 hardens early after filling and develops a predetermined initial strength, and hardly changes in volume. That is, as shown in FIG. 11, the backfill material 56 exhibits a predetermined initial strength (1.0 kg / cm · cm) three hours after the completion of filling. Therefore, after filling the backfill portion 56 with the backfill material 56,
As described later, excavation (advance) of the replacement shield 1 for the next time can be started early, and the tunnel 50 can be suitably backfilled. Note that the final strength of the backfill material 56 reaches 10.0 kg / cm · cm. Further, as shown in FIG. 12, the compressive strength of the backfill material 56 can be improved by increasing the kneading time of the backfill material 56.

In this manner, the backfilling material 56 is filled in the backfilling portion 57 behind the tail partition wall 9 which has advanced to the non-backfilling portion 55, and the backfilling operation is performed by the length L of one segment 51 of the tunnel 50. Is completed, again, each propulsion jack 6
Of the propulsion jack 6 shown in FIG.
a, as shown in FIG.
At the same time, the engagement between the outer shell 2 and the segment 51 and the secondary lining 52 by the shield fixing device 21 shown in FIG. 3 is released. Then, as described above, in a state where the water between the inner cylinder 5 and the segment 51 is stopped by the sealing device, the contact plate 16, the segment connector 13, the partition connector 1
The cutter 7a receives a reaction force from the tail partition 9 fixed to the segment 51 and the secondary lining 52 through the cutter 7a.
While excavating the ground 60 outside the segment 51,
The outer shell 2 is extended by a length L for one ring of the segment 51,
It is further advanced in the direction of arrow C.

In this manner, the operation of backfilling the tunnel 50 with the replacement shield 1 proceeds in a manner opposing the pressure of the ground 60 and the backfilled portion 57, so that the segment 51,
The removal work of the secondary lining 52 can be safely performed, and the backfill portion 57 can be filled with the backfill material 56 in a suitable manner.

The blending ratio of the backfill material 56 may be the blending ratio shown in FIG. 13 corresponding to the required performance shown in FIG. In this case, when manufacturing the backfill material 56, water,
Sand (standard sand) and clay (micro sand) are kneaded, mixed water, sand and clay, thickener (fly ash)
Is added later to produce a base material. Separately from the base material, water and cement (normal Portland) are kneaded, and the kneaded water and cement are mixed with a quick-setting material (powder water glass).
Is post-added to produce a binder. Then, when the generated base material and the binder are kneaded, the backfill material 56 is manufactured. The backfill material 56 manufactured in this manner also has a high fluidity at the time of filling by pumping, so that the backfill material 57 is densely filled into the backfill portion 57 via the backfill material casting pipe 10. In addition to being able to cure, it is cured at an early stage after filling and develops a predetermined initial strength. That is, the backfill material 56 is
As shown in FIG. 15, three hours after the completion of filling, a predetermined initial strength (1.0 kg / cm · cm) is developed. Therefore, the excavation for the next time of the replacement shield 1 can be started at an early stage after the backfill portion 57 is filled with the backfill material 56.

[0033]

As described above, according to the present invention, a base material composed of water, sand and clay, a binder composed of water and cement, and a quick-setting material are mixed. The backfill material 56 has high fluidity at the time of filling, develops a predetermined initial strength early after filling, and hardly changes in volume. Therefore, the backfill material 56 is pumped and the backfill portion 57 is pumped.
Can be densely filled, and after the filling of the backfill material 56, the next excavation of the replacement shield 1 can be started early, so that the tunnel 50 can be suitably backfilled.

The present invention also provides a base material by kneading water, sand and clay, kneading water and cement,
A binder is generated, the generated base material and the binder are kneaded, and the kneaded base material and the binder are added to the quick-setting material, so that the backfill material 56 is filled. Occasionally, it has high fluidity, develops a predetermined initial strength early after filling, and hardly changes in volume. Therefore, the backfill material 56 can be pumped and densely filled in the backfill portion 57, and after the refill material 56 is filled, the next excavation of the replacement shield 1 can be started early. ,
The tunnel 50 can be suitably backfilled.

Further, according to the present invention, the base material composed of water, sand, clay and a thickener is mixed with a binder composed of water, cement and a quick-setting material. It has high fluidity at the time of filling, and develops a predetermined initial strength early after filling. Therefore, the backfill material 56 can be pumped and densely filled in the backfill portion 57, and after the refill material 56 is filled, the next excavation of the replacement shield 1 can be started early. , The tunnel 50 can be suitably backfilled.

The present invention also relates to a method of kneading water, sand and clay, adding a thickener to the kneaded water, sand and clay to form a base material, kneading water and cement, To the kneaded water and cement, a quick-setting material is added, a binder is formed, and the generated base material and the binder are kneaded, so that the backfill material 56 is filled at the time of filling. It has high fluidity and develops a predetermined initial strength early after filling. Therefore, the backfill material 56 can be pump-pumped and the backfill portion 57 can be densely filled, and the backfill material 56 can be densely filled.
Since the next excavation of the replacement shield 1 can be started at an early stage after filling, the tunnel 50 can be suitably backfilled.

[Brief description of the drawings]

FIG. 1 is a view showing a replacement shield and a tunnel filling process (first step) using the replacement shield.

FIG. 2 is a diagram illustrating a step (second) of tunnel backfill using the replacement shield illustrated in FIG. 1;

FIG. 3 is a view showing a step (third) of tunnel backfill using the replacement shield shown in FIG. 1;

FIG. 4 is a view showing a step (fourth) of tunnel burying by the replacement shield shown in FIG. 1;

FIG. 5 is a view of the replacement shield shown in FIG.

FIG. 6 is a diagram showing an example of a basic composition of a backfill material.

FIG. 7 is a diagram showing a change in the composition of the backfill material shown in FIG. 6 depending on temperature conditions.

8 is a diagram showing an example of a component of clay mixed in the backfill material shown in FIG. 6 or FIG.

FIG. 9 is a diagram showing an example of components of a quick-setting material mixed into the backfill material shown in FIG. 6 or FIG.

FIG. 10 is a diagram showing required performance for the backfill material shown in FIG. 6 or FIG.

FIG. 11 is a diagram showing the relationship between the compressive strength of the backfill material having the composition shown in FIG. 6 or 7 and the time after filling.

FIG. 12 is a diagram showing the relationship between the compressive strength and the kneading time of the backfill having the composition shown in FIG. 6 or 7.

FIG. 13 is a view showing another example of the basic composition of the backfill material.

FIG. 14 is a diagram showing required performance for the backfill material shown in FIG.

FIG. 15 is a diagram showing the relationship between the compressive strength of the backfill material having the composition shown in FIG. 13 and the time after filling.

[Explanation of symbols]

 1 Replace shield 50 Tunnel 56 Backfill material

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Michiaki Yamamoto 518-1, Komagaki, Nagareyama-shi, Chiba Pref. Mitsui Construction Co., Ltd. Technology Research & Development Headquarters Technology Research Laboratory (72) Inventor Hideaki Baba 9 Kameido, Koto-ku, Tokyo Chome 15-1 Japan Chemical Industry Co., Ltd. Research and Development Headquarters (72) Inventor Kuniaki Maejima 9-15-15 Kameido, Koto-ku, Tokyo Japan Chemical Industry Co., Ltd. Research and Development Headquarters (72) Inventor Shigen Sonobe Tokyo 9-15-1, Kameido, Koto-ku Nippon Chemical Industry Co., Ltd.

Claims (4)

(57) [Claims] 1. A backfill material used for backfilling an unnecessary tunnel, comprising a base material composed of water, sand and clay, a binder composed of water and cement, and a quick-setting material. Return material. 2. Kneading water, sand and clay to form a base material, kneading water and cement to form a binder, kneading the generated base material and binder, and A method of manufacturing a backfill material used for backfilling an unnecessary tunnel configured by adding a quick-setting material to a completed base material and a binder material. 3. A backfill material used for backfilling an unnecessary tunnel, wherein a base material composed of water, sand, clay and a thickener is mixed with a binder composed of water, cement and quick-setting material. Constructed backfill material. 4. Kneading water, sand and clay, adding a thickener to the kneaded water, sand and clay,
A base material is produced, water and cement are kneaded, and a quick-setting material is added to the kneaded water and cement,
It generates a binding material, the generated backfill material manufacturing method that are used to return implantation of unnecessary tunnel configured so as to knead the core material and binding material.