JPH0893395A - Cut-off method of check boring in shielding work - Google Patents

Abstract

PURPOSE: To cut off water easily, inexpensively, and securely without auxiliary methods from the ground level like a chemicals liquid injection. CONSTITUTION: A cutting-off box 6 provided with a rubber sheet at the bottom is fitted to an expected part which is the ceiling of a shield segment 3 and in which a drilled hole casing 5 for the boring from the ground level pierces, so as to surround the expected part to be pierced. The drilled hole easing 5 is forced to pierce the rubber plate 7 at the bottom and project the front end to the outside of cutting-off box 6, after it has pierced the segment 3. The rubber plate 7 is forced to contact with pressure with the outer periphery of the drilled hole easing 5 to primarily cut off water. A grouting material 12 is injected in the cutoff box 6 to prevent water from leaking thereafter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stop method for check boring in shield work.

[0002]

2. Description of the Related Art In shield work, check boring for introducing a ground surveying reference point into a mine is an important task.

This check boring is drilled from the ground with a hole-drilling casing and penetrates the ceiling of the shield segment. However, water stoppage at this time poses a problem.

Conventionally, the deep check boring is shown in FIG.
As shown in (1), preceding boring is performed by the outer tube 1 which is a guide tube, and the chemical solution injection 4 is performed between the outer tube 1 and the shield segment 3. Water is stopped by boring the inside of the outer pipe 1 with the inner pipe 2.

[0005]

However, when the water is stopped by the chemical injection 4, the water is incomplete and water leakage is likely to occur. Also,
If there is a water leak, it is difficult to stop the water from the mine due to the high water pressure, and in some cases it may be necessary to inject chemicals from the ground, which will increase the cost of incidental work and lengthen the construction period.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a method of stopping check boring for shield construction which is simple, inexpensive, and capable of surely stopping water.

[0007]

In order to achieve the above-mentioned object, the present invention has a stopper provided with a rubber plate on the bottom of a shield segment ceiling portion where a drilling casing for boring from the ground is supposed to penetrate. Attach the water box so that it surrounds the part to be penetrated, and after penetrating this hole-drilling casing into a segment, penetrate the bottom rubber plate to project the tip outside the water-stop box, and press-contact the rubber plate to the outer periphery of the hole-drilling casing. To prevent the subsequent leakage by pouring grout material into the water-stop box, and the rubber plate at the bottom of the water-stop box is sandwiched between the top and bottom with thin steel plates to close the water-stop box bottom plate. The gist is that the water blocking box is provided with a grout inlet with a cock.

[0008]

According to the first aspect of the present invention, the water blocking box is attached to the ceiling of the shield segment, and the rubber plate at the bottom of the water blocking box is penetrated to penetrate the drilled casing to the outside of the water blocking box after penetrating the segment. By protruding the tip,
Primary water stopping can be achieved by pressing the rubber plate against the outer circumference of the drilled casing. Then, as the secondary water stop, the grout material can be injected into the water stop box to completely prevent the subsequent water leak. In this way, you can complete the water stop with the water stop box,
It enables quick and inexpensive construction.

According to the second aspect of the present invention, in addition to the above action, the rubber plate is used as a member forming the bottom plate of the water blocking box, so that the structure of the water blocking box itself is inexpensive and simple. Can be

According to the third aspect of the present invention, the water shut-off box is provided with the grout injection port with the cock, so that the grout material can be easily and surely injected into the water shut-off box.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 4 are front views of respective steps showing one embodiment of a method of stopping water for check boring in shield construction of the present invention, in which 3 is a shield segment and 5 is a drilling casing having a tip as an excavation head 5a. Is.

As shown in FIG. 1, a casing 5 for boring from the ground is provided on the ceiling of the shield segment 3.
Attach the water shut-off box 6 to the part that will penetrate.

5 and 6 show the details of the water shut-off box 6, the side plate 6a is made of a steel plate and the upper surface is open.
The bottom plate 6b is constructed by sandwiching the upper and lower sides of the rubber plate 7 with thin steel plates 8 and fastening the periphery with bolts and nuts 9.

Further, the side plate 6a is provided with a grout inlet 10 having a cock and an air vent 11 also having a cock. The grout inlet 10 and the air vent 11 have the same shape, and either one may be used.

Such a water blocking box 6 is attached by welding the shield segment 3 to the shield segment 3 so as to surround a portion of the shield segment 3 which is to be penetrated by the hole casing 5 and surrounds the opening.

In this way, the water blocking box 6 is attached to the shield segment 3 in advance, and boring is carried out from the ground with the drilled casing 5. The tilt measurement is performed before the drill casing 5 penetrates the shield segment 3.

As shown in FIG. 2, the hole-drilling casing 5 has its tip penetrating the shield segment 3 to enter the water blocking box 6, and further penetrating the bottom plate 6b to go out of the water blocking box 6. At that time, the rubber plate 7 constituting the bottom plate 6b is penetrated.

To penetrate the bottom plate 6b, the thin steel plate 8 and the rubber plate 7 are cut off by the excavation head 5a of the drilling casing 5, and as a result, the end of the rubber plate 7 is pressed against the outer periphery of the drilling casing 5 for the primary stop. Water is made.

Since the water blocking at the rubber plate 7 part may be incomplete, as shown in FIG. 3, the grout material 12 made of polygrout is introduced into the water blocking box 6 from the inside of the hole through the grout injection port 10. To prevent subsequent water leakage.

Then, as shown in FIG. 4, the hole-drilling casing 5 and the water blocking box 6 are welded and fixed to each other, and after capping the tip of the hole-drilling casing 5, the hole-drilling casing 5 is filled with cement milk. While pulling out the hole making casing 5. When the hole-drilling casing 5 is pulled out, the hole-drilling casing 5 is cut by reverse rotation and collected.

[0021]

As described above, the water stop method for check boring in the shield work of the present invention can easily and inexpensively and reliably stop water without auxiliary construction methods such as chemical injection from the ground. Is.

[Brief description of drawings]

FIG. 1 is a front view of a first step showing one embodiment of a method of stopping water for check boring in shield work of the present invention.

FIG. 2 is a front view of a second step showing an embodiment of the method of stopping water for check boring in shield work of the present invention.

FIG. 3 is a front view of a third step showing one embodiment of the method of stopping water in check boring for shield work of the present invention.

FIG. 4 is a front view of a fourth step showing one embodiment of the method of stopping water in check boring for shield work of the present invention.

FIG. 5 is a vertical sectional front view of the water shut-off box.

FIG. 6 is a cross-sectional plan view of the water stop box.

FIG. 7 is a vertical sectional front view showing a conventional example.

[Explanation of symbols]

1 ... Outer pipe 2 ... Inner pipe 3 ... Shield segment 4 ... Chemical injection 5 ... Drilling casing 5a ... Drilling head 6 ... Water stop box 6a ... Side plate 6b ... Bottom plate 7 ... Rubber plate 8 ... Thin steel plate 9 ... Bolts / nuts 10 … Grout inlet 11… Air vent 12… Grout material

Claims (3)

[Claims] 1. A shield box having a rubber plate at the bottom is attached to a portion of a ceiling portion of the shield segment where a drilling casing for boring from the ground penetrates, so as to surround the portion to penetrate. After penetrating the hole-drilling casing into the segment, penetrate the bottom rubber plate to project the tip out of the water-stop box, and press the rubber plate to the outer periphery of the hole-cut casing to perform primary water-stop, and then grout material inside the water-stop box. A check boring stop method for shield construction, which is characterized by injecting water to prevent subsequent water leakage. 2. The method for stopping water in check boring of shield work according to claim 1, wherein the rubber plate at the bottom of the water blocking box is sandwiched between thin steel plates to form a bottom plate of the water blocking box. 3. The method for stopping check boring in shield work according to claim 1, wherein the water stop box is provided with a grout inlet with a cock.