CN209959252U - Sealing device for subway tunnel starting tunnel portal by sandy soil layer shield method - Google Patents
Sealing device for subway tunnel starting tunnel portal by sandy soil layer shield method Download PDFInfo
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- CN209959252U CN209959252U CN201920480437.8U CN201920480437U CN209959252U CN 209959252 U CN209959252 U CN 209959252U CN 201920480437 U CN201920480437 U CN 201920480437U CN 209959252 U CN209959252 U CN 209959252U
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Abstract
The utility model discloses a sandy soil layer shield method subway tunnel portal sealing device that starts has solved if take place the problem that great soil body collapses portal sealing device bearing strength is not enough in the tunnelling hole when sandy soil body shield is started. The outer side lock joint of inner annular clamp plate (12) excircle has steel sleeve (8), outside end fixed welding at steel sleeve (8) has annular thick chopsticks board (18), equidistant radian fixed mounting has outer stud (7) on annular thick chopsticks board (18), install outer curtain cloth rubber slab (2) on outer stud (7), install outer annular clamp plate (4) on outer curtain cloth rubber slab (2), install outer hinge plate stiff end (5) on outer annular clamp plate, outer hinge plate stiff end is articulated through outer hinge (6) and outer hinge plate expansion end (3). And a second curtain cloth sealing mechanism is arranged on an outer port of the steel sleeve, and the falling of the inner curtain cloth sealing mechanism cannot influence the outer curtain cloth sealing mechanism.
Description
Technical Field
The invention relates to a subway tunnel starting tunnel portal, in particular to a sealing device and a sealing method for a subway tunnel starting tunnel portal by a sandy soil layer shield method.
Background
In the shield method subway construction, a shield machine is used for performing tunneling construction after entering an excavated tunnel from an initial tunnel, when a shield machine head enters an initial tunnel door, a sealing mechanism is required to be arranged between the outer side wall of the shield machine and the rock wall of the excavated tunnel, so that the tunneled tunnel is in a pressure maintaining state, and simultaneously, the soil body and slurry on the tunnel face cannot leak out of the initial tunnel door when the shield machine performs tunneling construction; the sealing mechanism mainly comprises an annular cord fabric rubber plate, an annular pressing plate and hinge plates, wherein the annular cord fabric rubber plate is fixed on the outer annular outer side wall of the door of an initial tunnel portal of an excavated tunnel, the inner diameter of the annular cord fabric rubber plate is smaller than the diameter of the tunnel portal, the annular pressing plate is buckled and pressed on the outer ring of the annular cord fabric rubber plate, the hinge plates are uniformly distributed on the outer side surface of the annular pressing plate along the circular arc of the excircle, the hinge plates are spliced to form a circular ring, and the diameter of the inner circle of the circular ring is larger than the diameter of the inner circle of the annular cord fabric rubber plate but smaller than the diameter of the initial tunnel; when the shield machine head enters the starting tunnel portal from the outside of the starting tunnel portal, the outer side wall of the shield machine pushes the folding plate into the tunnel portal to be bent, the rock wall on the inner side of the starting tunnel, the annular pressing plate, the folding plate and the outer side wall of the shield machine form a closed pressure maintaining space, the space also becomes a closed barrier for preventing grout from leaking to the outside of the starting tunnel portal after grouting of the shield machine, and the closed space also becomes a closed barrier for preventing front soil from leaking to the outside when the shield machine continues to drive forwards. The existing starting tunnel portal sealing device is in a single-layer curtain arrangement mode, when a shield machine starts in a sandy soil layer, the stability of the soil body is easy to appear after the sandy soil layer is disturbed, the soil body collapses, the pressure of the collapsed soil body is extremely high, the sealing mechanism of the single-layer curtain falls off from the outer annular outer side wall of the portal of the starting tunnel portal and rushes out of a starting well, the sealed pressure-maintaining soil body environment of the whole shield is damaged, and the ground above the shield tunnel is directly induced to have larger settlement. In order to solve the problem that the sealing mechanism of the single-layer curtain has weak pressure resistance, the chinese patent publication No. CN105822312A, entitled: the technical scheme of the construction method for constructing the pressure starting of the earth pressure balance shield in the subway tunnel engineering is that a spring plate closed ring is additionally arranged on an embedded steel ring of the existing tunnel portal, an extension ring is additionally arranged on the outer annular side wall of the door of the starting tunnel portal, a sealing device consisting of an annular cord fabric rubber plate, an annular pressing plate and a hinge plate is arranged on the outer side opening of the extension ring, and grease is added in the extension ring, so that the spring plate closed ring, the inner grease adding and the sealing device form a stressed whole to bear the soil pressure in the tunnel together, the structure is that a sealing structure of a second layer of spring plate is additionally arranged on a sealing mechanism of a single layer of curtain, the structure can play a sealing effect only by filling the grease in the extension ring, the cost is high, the pressure resistance of the spring plate is weak, the whole two layers of sealing devices form a whole body to be fixed on the tunnel portal, and the double layers of sealing devices can not fundamentally solve the problem when the sandy soil shield starting, when the larger soil body collapses, the whole two-layer sealing device is easy to fall off from the portal integrally under the action of the larger water and soil pressure.
Disclosure of Invention
The invention provides a sealing device and a sealing method for a launching portal of a subway tunnel by a sandy soil layer shield method, which solve the technical problem that the bearing strength of the sealing device for the portal is insufficient if a large soil body collapse occurs in a driving tunnel when a sandy soil body shield is launched.
The invention solves the technical problems by the following technical scheme:
a sealing device of a subway tunnel starting tunnel door by a sandy soil layer shield method comprises a starting tunnel door, wherein an embedded steel ring is arranged in the outer side wall of a tunnel door of the starting tunnel door, inner stud bolts are fixedly arranged on the embedded steel ring at equal intervals at radian, inner curtain cloth rubber plates are arranged on the inner stud bolts, inner annular pressing plates are arranged on the inner curtain cloth rubber plates, inner hinged plate fixed ends are arranged on the inner annular pressing plates, the inner hinged plate fixed ends are hinged with the inner hinged plate movable ends through inner hinges, a steel sleeve is buckled on the outer side of the outer circle of the inner annular pressing plates, the inner side ends of the steel sleeve are welded with the embedded steel ring, an annular thick chopstick plate is fixedly welded on the outer side end of the steel sleeve, outer stud bolts are fixedly arranged on the annular thick chopstick plate at equal intervals at radian, outer curtain cloth rubber plates are arranged on the outer stud bolts, an outer annular pressing plate is arranged on the outer curtain cloth rubber plates, the outer annular pressing plate is provided with an outer hinge plate fixed end which is hinged with the movable end of the outer hinge plate through an outer hinge.
The steel sleeve is formed by splicing four arc-shaped plates, and the length of the steel sleeve is 30-50 cm.
A sealing method for a starting tunnel portal of a sand soil shield subway tunnel comprises the following steps:
firstly, fixedly mounting inner stud bolts in an embedded steel ring at equal intervals in radian on the outer side wall of a door opening of a starting door, mounting an inner curtain cloth rubber plate on the inner stud bolts, mounting an inner annular pressing plate on the inner curtain cloth rubber plate, mounting an inner folding plate fixed end on the inner annular pressing plate, and hinging the inner folding plate fixed end with an inner folding plate movable end together through an inner hinge;
secondly, manufacturing a steel sleeve with the diameter larger than the diameter of the excircle of the inner annular pressure plate, wherein the length of the steel sleeve is 30-50 cm, and the steel sleeve is formed by splicing four arc-shaped plates;
welding a lower arc plate on the outer side wall of the doorway below the embedded steel ring of the starting doorway, welding a left waist arc plate and a right waist arc plate on the outer side walls of the doorways on the two waist outer sides of the embedded steel ring of the starting doorway, welding an upper arc plate on the outer side wall of the doorway above the embedded steel ring of the starting doorway, and welding the upper, the lower, the left and the right annular steel plates together to form an integral steel sleeve;
fourthly, fixedly mounting outer stud bolts at the outer side end of the steel sleeve at equal intervals in radian, mounting an outer curtain cloth rubber plate on the outer stud bolts, mounting an outer annular pressing plate on the outer curtain cloth rubber plate, mounting an outer hinge plate fixed end on the outer annular pressing plate, and hinging the outer hinge plate fixed end with the outer hinge plate movable end together through an outer hinge;
fifthly, when the shield machine head is jacked from the outer side of the starting tunnel portal to the inner side of the starting tunnel portal, the shield machine head firstly pushes the movable end of the outer flap plate into the starting tunnel portal, the movable end of the outer flap plate swings towards the inner side of the tunnel around the outer hinge, the movable end of the outer flap plate extrudes the rubber plate with the outer curtain to swing towards the inner side of the tunnel, so that the inner side wall of the steel sleeve, the shield machine head, the rubber plate with the outer curtain and the movable end of the outer flap plate form an outer side closed space, the shield machine head continuously jacks forwards, the shield machine head pushes the movable end of the inner flap plate towards the inside of the starting tunnel portal, the movable end of the inner flap plate extrudes the rubber plate with the inner curtain to swing towards the inner side of the starting tunnel portal, the shield machine head, the rubber plate with the inner curtain and the movable end of the inner flap plate form an inner side closed space;
and sixthly, after the shield machine head completely enters the starting tunnel door, the shield machine performs synchronous grouting construction, grouting slurry is sealed in the inner side closed space, and after the sandy soil in the inner side closed space has gushing water and gushing sand, if gushing water and soil pressure breaks through the inner curtain cloth rubber plate and the inner flap plate movable end in the inner side closed space and enters the outer side closed space, secondary sealing blocking can be performed by the outer curtain cloth rubber plate in the outer side closed space and the outer flap plate movable end formed outer side closed space.
The double-layer sealing curtain cloth is arranged to form the inner sealing space and the outer sealing space, so that the phenomenon that the sealing mechanism of the single-layer curtain falls off from the outer annular outer side wall outside the door of the starting tunnel door to relieve the pressure of the shield sealing space and induce the ground collapse phenomenon when water gushes and sand gushes occur in the starting construction process of the shield can be effectively prevented. When the phenomenon of water burst and sand burst occurs, the two layers of pressure maintaining blocking mechanisms can effectively control a large amount of water and soil loss, and the safety of shield starting in a sandy soil layer is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the double-layer sealing curtain of the invention and is also a sectional view I-I in FIG. 1;
fig. 3 is a schematic view of the structure of the steel sleeve 8 of the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
a sealing device for a subway tunnel starting tunnel portal by a sandy soil layer shield method comprises a starting tunnel portal 1, wherein an embedded steel ring 9 is arranged in the outer side wall of the tunnel portal of the starting tunnel portal 1, inner stud bolts 10 are fixedly arranged on the embedded steel ring 9 at equal intervals in a radian manner, inner cord rubber plates 11 are arranged on the inner stud bolts 10, inner annular pressing plates 12 are arranged on the inner cord rubber plates 11, inner hinge plate fixing ends 13 are arranged on the inner annular pressing plates 12, the inner hinge plate fixing ends 13 are hinged with inner hinge plate movable ends 14 through inner hinges 15, steel sleeves 8 are buckled on the outer sides of the outer circles of the inner annular pressing plates 12, the inner side ends of the steel sleeves 8 are welded with the embedded steel ring 9, annular thick chopsticks plates 18 are fixedly welded on the outer side ends of the steel sleeves 8, outer stud bolts 7 are fixedly arranged on the annular thick chopsticks plates 18 at equal intervals in a radian manner, outer stud bolts 2 are arranged on the outer stud bolts 7, an outer annular pressing plate 4 is arranged on the outer curtain cloth rubber plate 2, an outer hinge plate fixed end 5 is arranged on the outer annular pressing plate 4, and the outer hinge plate fixed end 5 is hinged with an outer hinge plate movable end 3 through an outer hinge 6; according to the invention, on the inner curtain cloth sealing mechanism fixedly arranged on the door of the traditional starting tunnel, the extended steel sleeve 8 is arranged on the door of the starting tunnel, and the second curtain cloth sealing mechanism, namely the outer curtain cloth sealing mechanism, is arranged on the outer port of the steel sleeve 8, so that a second layer of pressure-maintaining defense line in the driving tunnel is formed, and the inner curtain cloth sealing mechanism and the outer curtain cloth sealing mechanism are arranged independently, so that the falling of the inner curtain cloth sealing mechanism does not influence the outer curtain cloth sealing mechanism.
The steel sleeve 8 is formed by splicing four arc-shaped plates, and the length of the steel sleeve 8 is 30-50 cm; the split steel sleeve structure reduces the difficulty of installation.
A sealing method for a starting tunnel portal of a sand soil shield subway tunnel comprises the following steps:
firstly, fixedly installing inner stud bolts 10 at equal intervals in radian at equal intervals in embedded steel rings 9 in the outer side wall of a door opening of a starting door 1, installing inner curtain cloth rubber plates 11 on the inner stud bolts 10, installing inner annular pressing plates 12 on the inner curtain cloth rubber plates 11, installing inner hinge plate fixed ends 13 on the inner annular pressing plates 12, and hinging the inner hinge plate fixed ends 13 with inner hinge plate movable ends 14 together through inner hinges 15;
secondly, manufacturing a steel sleeve 8 with the diameter larger than the diameter of the excircle of the inner annular pressure plate 12, wherein the length of the steel sleeve 8 is 30-50 cm, and the steel sleeve 8 is formed by splicing four arc-shaped plates;
thirdly, welding a lower arc plate on the outer side wall of the doorway below the embedded steel ring 9 of the starting doorway 1, welding a left waist arc plate and a right waist arc plate on the outer side walls of the doorways on the outer sides of the two waists of the embedded steel ring 9 of the starting doorway 1, welding an upper arc plate on the outer side wall of the doorway above the embedded steel ring 9 of the starting doorway, and welding four annular steel plates, namely an upper annular steel plate, a lower annular steel plate, a left annular steel plate and a right annular steel plate together to form an integral steel sleeve 8;
fourthly, fixedly mounting outer stud bolts 7 at equal intervals in radian at the outer side end of the steel sleeve 8, mounting outer curtain cloth rubber plates 2 on the outer stud bolts 7, mounting outer annular pressing plates 4 on the outer curtain cloth rubber plates 2, mounting outer hinge plate fixing ends 5 on the outer annular pressing plates 4, and hinging the outer hinge plate fixing ends 5 with outer hinge plate movable ends 3 through outer hinges 6;
fifthly, when the shield machine head 16 is jacked from the outer side of the starting tunnel portal 1 to the inner side of the starting tunnel portal 1, the shield machine head 16 firstly pushes the movable end 3 of the outer folding plate into the starting tunnel portal 1, the movable end 3 of the outer folding plate swings towards the tunnel around the outer hinge 6, the movable end 3 of the outer folding plate extrudes the rubber plate 2 of the outer curtain cloth and also swings towards the tunnel, so that the inner side wall of the steel sleeve 8 and the shield machine head 16, the outer curtain cloth rubber plate 2 and the movable end 3 of the outer folding plate form an outer side closed space, the shield machine head 6 continues to push forwards, the shield machine head 16 pushes the movable end 14 of the inner folding plate into the starting tunnel door 1, the movable end 14 of the inner folding plate swings towards the inside of the tunnel around the inner hinge 15, and the movable end 14 of the inner folding plate extrudes the inner curtain cloth rubber plate 11 and also swings towards the inside of the tunnel, so that the inner side wall 17 of the starting tunnel door, the shield machine head 16, the inner curtain cloth rubber plate 11 and the movable end 14 of the inner folding plate form an inner side closed space;
sixthly, after the shield machine head 16 completely enters the starting tunnel portal 1, the shield machine carries out synchronous grouting construction, grouting slurry is sealed in the inner side closed space, when sandy soil in the inner side closed space has water gushing and sand gushing, after the inner curtain cloth rubber plate 11 and the inner folding plate movable end 14 which break through the inner side closed space by the pressure of the gushed water and soil enter the outer side closed space, secondary sealing blocking can be carried out by the outer side closed space formed by the outer curtain cloth rubber plate 2 and the outer folding plate movable end 3 in the outer side closed space.
Claims (2)
1. A sealing device for a starting tunnel portal of a sand soil shield subway tunnel comprises a starting tunnel portal (1), wherein an embedded steel ring (9) is arranged in the outer side wall of the tunnel portal of the starting tunnel portal (1), inner stud bolts (10) are fixedly arranged on the embedded steel ring (9) at equal intervals in a radian mode, inner curtain cloth rubber plates (11) are arranged on the inner stud bolts (10), inner annular pressing plates (12) are arranged on the inner curtain cloth rubber plates (11), inner hinge plate fixing ends (13) are arranged on the inner annular pressing plates (12), and the inner hinge plate fixing ends (13) are hinged with inner hinge plate movable ends (14) through inner hinges (15); the outer-circle-shaped inner-folding-type rubber sleeve is characterized in that a steel sleeve (8) is buckled on the outer side of the outer circle of an inner-circle-shaped pressing plate (12), the inner side end of the steel sleeve (8) is connected with an embedded steel ring (9) in a welding mode, an annular thick chopsticks plate (18) is fixedly welded on the outer side end of the steel sleeve (8), outer double-headed bolts (7) are fixedly installed on the annular thick chopsticks plate (18) at equal intervals in radian, an outer curtain cloth rubber plate (2) is installed on the outer double-headed bolts (7), an outer ring-shaped pressing plate (4) is installed on the outer curtain cloth rubber plate (2), an outer folding-plate fixing end (5) is installed on the outer ring-shaped pressing plate (4), and the outer folding-plate fixing end (5) is hinged with an outer folding.
2. The sealing device for the launching tunnel portal of the sandy soil layer shield-method subway tunnel according to claim 1, wherein the steel sleeve (8) is formed by splicing four arc-shaped plates, and the length of the steel sleeve (8) is 30-50 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920480437.8U CN209959252U (en) | 2019-04-10 | 2019-04-10 | Sealing device for subway tunnel starting tunnel portal by sandy soil layer shield method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920480437.8U CN209959252U (en) | 2019-04-10 | 2019-04-10 | Sealing device for subway tunnel starting tunnel portal by sandy soil layer shield method |
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| Publication Number | Publication Date |
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| CN209959252U true CN209959252U (en) | 2020-01-17 |
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| CN201920480437.8U Active CN209959252U (en) | 2019-04-10 | 2019-04-10 | Sealing device for subway tunnel starting tunnel portal by sandy soil layer shield method |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210726 Address after: 101300 Building 2, 16 Linhe street, Shunyi District, Beijing Patentee after: CHINA RAILWAY 19TH BUREAU GROUP RAIL TRANSIT ENGINEERING Co.,Ltd. Patentee after: China Railway 19th Bureau Group Sixth Engineering Co.,Ltd. Address before: 101300 No. 16, Linhe street, Linhe Economic Development Zone, Shunyi District, Beijing Patentee before: CHINA RAILWAY 19TH BUREAU GROUP RAIL TRANSIT ENGINEERING Co.,Ltd. |
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| TR01 | Transfer of patent right |