JPH0988476A - Method for filling up or backfilling vacant space formed by shield driving work with slurry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save natural resources by filling up or backfilling the vacant space of a shield reaching wall with mortar prepared by mixing cement in excessive slurry which comes out when slurry is used for shield driving work. SOLUTION: A steel mold 3 is provided between the heading 2 of a main tunnel 1 dug by a shield driving method using slurry and a sheathing 7 so as to surround a communicative port 5. Then a partition wall 6 for shield reaching wall is formed by throwing mortar prepared by mixing a prescribed amount of cement in the excessive slurry of a shield machine 4 in a hopper and placing the mortar between the heading 2 and the mold 3 through a hose. When the shield machine 4 is driven and collides with the heading 2 (partition wall 6) thereafter, the driving work is terminated. Therefore, the slurry can be recycled and the amount of industrial waste can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for filling and backfilling voids with mortar using mud such as excess mud in shield construction by a mud shield construction method or the like.

[0002]

2. Description of the Related Art There is a shield construction method as one of tunnel construction methods, and among them, it is classified as a closed type mechanical shield. A mud water (mud pressure) shield construction method and earth pressure that can be dug while suppressing the face with mud or mud There is a shield construction method (including soil pressurization type, water addition type, mud addition type (including mud pressure, sludge, high concentration submersion)).

[0003] In the shield reaching process, when filling voids in a narrow portion such as a partition wall or appropriately backfilling, conventionally,
It was done using standard mortar or concrete or soil concrete. Note that, for example, surplus mud water in the mud shield work has conventionally been dehydrated and treated as industrial waste.

[0004]

As described above, the prior art is as follows.
While using mortar and concrete to fill the voids and appropriately backfill narrow spaces such as bulkheads in the shield arrival work, there was a waste of treating excess mud in the mud shield construction as industrial waste. .

Therefore, an object of the present invention is to effectively use muddy water such as surplus muddy water produced by a shield construction method such as a muddy water shield construction method to make mortar, and for example, to make a gap to a narrow portion such as a partition wall in shield reaching work. It is an object of the present invention to provide a void filling / backfilling method for use in muddy water in shield construction, which can contribute to resource saving as well as reduction of industrial waste by muddy water treatment by performing filling and appropriate backfilling.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention uses muddy water such as surplus muddy water produced by a shield construction by a muddy water shield construction method, and cements the muddy water.
For example, a mortar corresponding to a required strength of 7 to 15 days strength of 3 to 15 kgf / cm ^{2 is} prepared by mixing with a composition as shown in FIG. It features a void filling and backfilling method using muddy water in shield work, which is designed to fill and backfill narrow spaces such as partition walls.

[0007] In this way, by filling the voids and backfilling the narrow spaces such as partition walls in the shield reaching work with the mortar mixed with cement using the muddy water produced in the shield construction, the muddy water such as surplus muddy water is effectively used. It can be reused for filling of voids and backfilling in narrow spaces that do not require high strength. As a result, resources can be saved and industrial waste can be reduced by muddy water treatment.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the void filling / backfilling method using muddy water in a shield work according to the present invention will be described below with reference to FIGS. 1 to 3.

First, FIG. 1 is a front view showing a partition wall in a shield reaching process as an example to which the present invention is applied, and FIG. 2 is a longitudinal side view showing a sectional shape of the partition wall in the shield reaching process. 1 is a main wall, 2 is a back wall part, 3 is a steel form, 4 is a shield machine, 5 is a communication port, 6 is a partition wall, 7
Is earth retaining. The main shaft 1 is already excavated by a shield machine for muddy water shield construction not shown and lined with segments. As shown in the drawing, the back wall portion 2 of the main shaft 1 is previously shielded. The steel form 3 for the partition wall provided between the earth retaining member 7 and the earth retaining member 7 is provided.
A shield machine 4 for mud shield construction digs in from the opposite side of the main wall 1 and the back wall 2.

The steel form 3 has a shape surrounding the periphery of the communication port 5 formed in the back wall portion 2 by the shield reaching work, and is supported by the steel frame in the main shaft 1. There is. Further, the portion of the inner wall portion 2 where the communication port 5 is formed is a void portion.

Then, as the shield machine 4 advances, a communication port 5 is formed in the back wall portion 2 on the back side of the steel form 3 as viewed from the main resistance 1 side. In preparation for the shield arrival work, in this embodiment, the excess muddy water used in the shield machine 4 for the muddy water shield construction when the main tunnel 1 is dug is used, and cement is applied to the excess muddy water. The mortar is made by mixing, and the mortar using muddy water is used to fill the gap between the steel form 3 and the back wall portion 2 to form the partition wall 6.

That is, on the side of the main anti-stress 1, specifically,
Using a mixer (not shown), a predetermined amount of cement is mixed with excess mud to make mortar, and the mortar using excess mud is put into a hopper (not shown), and a back wall 2 and The mortar using the excess mud is placed between the steel form 3 and the mortar. After that, the partition wall 6 is formed in preparation for the shield reaching work which is brought about by the drying and solidification of the cast mortar.

Therefore, the shield machine 4 for mud shield work is dug from the opposite side of the main body 1 and the back wall portion 2 (the partition wall 6), and the earth retaining 7 and the back wall portion 2 (the partition wall 6). When the communication port 5 is opened on the back side of the steel form 3 as seen from the main resistance 1 side, the excavation of the shield machine 4 is completed.
After that, the partition 6 and the steel form 3 are removed, so that the communication port 5 is opened when viewed from the main tunnel 1 side.

Here, as for the mixture of muddy water and cement for making the above-mentioned mortar for filling voids, as a result of repeating various test formulations, as shown in the chart of FIG.
The mortar strength test result> using surplus mud was obtained.

That is, in the chart <Results of mortar strength test using surplus mud> in the chart of FIG.
1 is 80 kg of cement per 1 m ^{3 of} mortar and muddy water 9
In the case of 75 liters, the 7-day strength is 3.
4 kgf / cm ² , 3.2 kgf / cm ² , 3.8k
gf / cm ² was obtained. Therefore, the average of 7-day intensity is 3.
It is 4 kgf / cm ² .

In addition, in the chart of FIG. 3 <results of mortar strength test using excess mud>, the following data No. Two
Is 9 kg of muddy water with 120 kg of cement per 1 m ^{3 of} mortar.
In the case of the 62 l formulation, the 7-day strength was 6.
5 kgf / cm ² , 6.1 kgf / cm ² , 6.0 k
gf / cm ² was obtained. Therefore, the average of 7-day intensity is 6.
It is 2 kgf / cm ² .

Further, in the chart <Results of mortar strength test using excess mud> shown in FIG. 3
Is muddy water with 160 kg of cement per 1 m ^{3 of} mortar.
In the case of the composition of 52 l, the 7-day strength was 9.
^{2kgf / cm 2, 8.8kgf / cm} 2, 8.7k
gf / cm ² was obtained. Therefore, the average of 7-day intensity is 8.
It is 9 kgf / cm ² .

Then, in the chart <Results of mortar strength test using surplus mud> of the last data No.
No. 4 is a case of mixing 180 kg of cement and 943 l of muddy water per 1 m ^{3 of} mortar.
1.3 kgf / cm ² , 11.8 kgf / cm ² , 1
1.6 kgf / cm ² was obtained. Therefore, the average of 7-day strength is 11.5 kgf / cm ² .

Based on the above chart <results of mortar strength test using surplus mud>, when filling or backfilling voids such as partition walls which does not require so high strength, a composition corresponding to the required strength is used. It shall be selected and used.

In the above-mentioned embodiments, the gap filling of the partition walls in the shield reaching work by the mortar using the excess mud in the mud shield construction is carried out, but the present invention is not limited to this. Mud water (including mud) produced by other earth pressure systems (including earth cutting pressure type, water addition type, mud addition type (mud pressure, sludge, highly concentrated submersion)) shield work, etc.
The voids may be filled or backfilled in appropriate places with mortar using.

[0021]

As described above, according to the void filling and backfilling method using muddy water in the shield work according to the present invention, the partition wall in the shield reaching work is prepared by using the mortar mixed with the cement using the muddy water produced in the shield work. It is possible to effectively reuse the muddy water such as surplus muddy water to fill the voids in the narrow space and to backfill it in the narrow space that does not require high strength. it can. Therefore, it is possible to save resources and also contribute to reduction of the amount of industrial waste due to muddy water treatment.

[Brief description of drawings]

FIG. 1 is a front view showing a partition wall in a shield reaching process as an example to which the present invention is applied.

FIG. 2 is a vertical sectional side view showing a sectional shape of a partition wall in the shield reaching process of FIG.

FIG. 3 is a table showing the results of mortar strength test using excess mud water according to the present invention.

[Explanation of symbols]

 1 main anti 2 back wall 3 steel form 4 shield machine 5 communication port 6 bulkhead 7 earth retaining

Claims (1)

[Claims] 1. A muddy water such as surplus muddy water produced in a shield construction by a muddy water shield method is used, cement is mixed with the muddy water to make mortar, and the mortar using the muddy water is used to form partition walls in shield reaching work. A method for filling and backfilling voids in mud water in shield construction, characterized by performing void filling and backfilling in narrow spaces.