DEVICE FOR BACK SOIL DISTURBANCE IN SHIELD TUNNEL

Abstract

The present invention relates to an apparatus for soil disturbance at the back of a shield tunnel, wherein: the apparatus is formed by a fitting I and a fitting II connected by means of three bolts that form equal angles; the fitting I is a short circular pipe; an end surface of a fitting end of the fitting I is provided with a water passage; a pipe wall of the pipe is provided with 2-8 water spouts; the fitting II is a long circular pipe whose inner and outer diameters are consistent with those of the fitting I; a fitting end of the fitting II is provided with two O-shaped water stop rings; a pipe wall of the fitting II is provided with three water inlets that form equal angles and are in communication with the water passage of the fitting I.

Claims

1. An apparatus for soil disturbance at the back of a shield tunnel, wherein: the apparatus is formed by a fitting I and a fitting II connected by means of three bolts that form equal angles; the fitting I is a short circular pipe; an end surface of a fitting end of the fitting I is provided with a water passage; a pipe wall of the pipe is provided with 2-8 water spouts; and an angle of 60° is formed between each of the water spouts and a radial direction; the fitting II is a long circular pipe whose inner and outer diameters are consistent with those of the fitting I; a fitting end of the fitting II is provided with two O-shaped water stop rings; a pipe wall of the fitting II is provided with three water inlets that form equal angles and are in communication with the water passage of the fitting I; an outer wall of a middle part of the fitting II is provided with a leather bag; the leather bag is in communication with a water stop leather bag pressurization hole by using a radial water stop leather bag pressurization passage; the water stop leather bag pressurization hole and communication ports of the water inlets are located at an end other than the fitting end; and centers of the fitting I and the fitting II are provided with axially through soil and water excavating and dumping holes, and diameters of the two soil and water excavating and dumping holes provided on the two fittings are the same.

2. The apparatus for soil disturbance at the back of a shield tunnel according to claim 1, wherein an outer diameter of the fitting I is 70-110 mm; a wall thickness is 15-20 mm; a diameter of each of the water spouts is 10-12 mm; the water passage is an annular groove with a groove depth of 1 mm; and three bolt holes (4-1) used to connect the fitting II are distributed with an angle of 120° between each two of the bolt holes.

3. The apparatus for soil disturbance at the back of a shield tunnel according to claim 1, wherein the fitting II is provided with three blind holes corresponding to the three bolt holes on the fitting I, and a hole depth is 10-15 mm.

4. The apparatus for soil disturbance at the back of a shield tunnel according to claim 2, wherein the fitting II is provided with three blind holes corresponding to the three bolt holes on the fitting I, and a hole depth is 10-15 mm.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG. 1 is a longitudinal sectional view (B-B section) of a fitting I according to an embodiment of the present invention;

[0013] FIG. 2 is a cross sectional view (A-A section) of the fitting I according to the embodiment of the present invention;

[0014] FIG. 3 is a longitudinal sectional view (E-E section) of a fitting II according to the embodiment of the present invention;

[0015] FIG. 4 is a cross sectional view (C-C section) of a fitting end of the fitting II according to the embodiment of the present invention;

[0016] FIG. 5 is a cross sectional view (D-D section) of a middle part of the fitting II according to the embodiment of the present invention; and

[0017] FIG. 6 is a schematic diagram of installation according to the present invention.

DETAILED DESCRIPTION

[0018] An apparatus for soil disturbance at the back of a shield tunnel of this embodiment is a cylindrical integral body formed by a fitting I and a fitting II connected by means of three bolts that form equal angles of 120°.

[0019] As shown in FIG. 1 and FIG. 2, the fitting I is a short circular pipe 1-1; an outer diameter of the fitting I is 70-110 mm; an inner diameter is not less than 40 mm; a wall thickness is not less than 15 mm, and an end surface of a fitting end of the short circular pipe 1-1 is provided with a water passage 3; the water passage 3 is an annular groove with a groove depth of 1 mm; a pipe wall at an outer side of the water passage is provided with eight water spouts whose diameters are not less than 10 mm; an angle of 60° is formed between each of the water spouts and a radial direction; three bolt holes 4-1 are disposed at the bottom of the water passage 3, and are used to connect the fitting II; and an angle between each two of the three bolt holes is 120°.

[0020] As shown in FIGS. 3, 4, and 5, the fitting II is a long circular pipe 1-2 whose inner and outer diameters are consistent with those of the fitting I. A fitting end of the fitting II is provided with two O-shaped water stop rings 7 that are used to stop water after the fitting I is connected to the fitting II. A pipe wall of the fitting II is provided with three water inlets 6 that form equal angles and are in communication with the water passage 3 of the fitting I and are used to introduce high pressure water for disturbing soil. An outer wall of a middle part of the fitting II is provided with a leather bag 8 which is in communication with at least one pressurization hole 9 by using a radial water stop leather bag pressurization passage 10. The least one pressurization hole 9 configured to pressurize the leather bag and the water inlets 6 configured to connect a high pressure water system are located at an end other than the fitting end. The leather bag 8 functions to fasten this apparatus to a shield tunnel segment 11, and block soil 12 or water (see FIG. 6).

[0021] The fitting II is provided with three blind holes 4-2 corresponding to the three bolt holes 4-1 on the fitting I, and a hole depth is not less than 10 mm. The fitting I is connected to the fitting II by using the bolts.

[0022] As shown in FIG. 6, the apparatus formed by assembling the fitting I and the fitting II is installed on the shield tunnel segment 11; a center of the apparatus is provided with axially through soil and water excavating and dumping holes 5 (diameters of the two soil and water excavating and dumping holes 5 provided on the two fittings are the same); high pressure water disturbs the soil 12 in a particular range at the back of the segment 11 by using this apparatus; disturbed soil and water are dumped from the soil and water excavating and dumping holes 5; when necessary, the soil and water excavating and dumping holes 5 may be used to excavate soil; or this apparatus is connected to a measurement system, so as to perform real-time monitoring on soil and water pressures after the disturbance; or this apparatus is connected to a grouting system, so as to perform grouting reinforcement on the disturbed soil.