CN212927885U - Combined magnetic tunnel portal sealing device for shield launching - Google Patents

Abstract

The utility model provides a combination formula magnetism portal sealing device for shield structure is originated. The combined magnetic tunnel portal sealing device comprises an embedded tunnel portal ring arranged at a shield starting tunnel portal, and the sealing device comprises a flexible sealing member arranged on the outer side surface of an outer ring plate of the embedded tunnel portal ring and a magnetic sealing member arranged in a cylindrical ring body; the flexible sealing component comprises an annular rubber cord fabric, an annular pressing plate and a plurality of folding pressing plates, wherein the annular rubber cord fabric is arranged on the outer side of the outer ring plate and is fixed on the outer ring plate by locking bolts after being pressed tightly by the annular pressing plate and the plurality of folding pressing plates; the magnetic sealing component comprises an annular elastic telescopic plugging steel plate, a tightening device, a magnetic steel sheet arranged on an inner ring of the elastic telescopic plugging steel plate and a magnetic steel sheet cleaning device. The utility model discloses it is sealed effectual, can avoid the shield to construct the in-process of starting and appear gushing water and gush husky accident.

Description

Combined magnetic tunnel portal sealing device for shield launching

Technical Field

The utility model belongs to shield constructs construction field, mainly be to the shield structure machine at the complicated stratum of rich water design of originating a combination formula magnetism portal sealing device that is used for the shield structure to originate.

Background

With the high-speed development of modern city construction, the trend that the large-area exploitation of underground space relieves the urban volume and traffic pressure is inevitable is, and the shield method has the advantages of quick construction and small influence on the ground, so that the shield method is evaluated by the industry as the best underground space construction method at present. In the shield method subway construction, the shield launching relates to the tunnel entering of a cutter head of a shield machine, and is one of the processes which are easy to cause accidents, most of the accidents in the shield launching construction process are caused by unstable soil body at a tunnel portal and leakage, particularly when the water content of the stratum in the construction range is large, the stratum is disturbed in the shield machine initiating process, a seepage passage of underground water is easily formed between the tunnel portal and a shield machine shell, the underground water with mud and sand flows out to induce water burst and sand burst and other accidents, and therefore water is required to be stopped at the tunnel portal, and the smooth launching of the shield machine is ensured.

Generally, the reinforcing quality of the shield launching part directly influences the normal launching of the shield, because one end of the shield launching part is exposed in a launching well in the launching process, and the other end of the shield launching part enters the soil body. In order to improve the safety of the starting process, when a cutter head of the shield machine enters a starting tunnel portal, a sealing mechanism needs to be arranged between a shield machine shell and a building gap of an excavated tunnel, so that the phenomenon that soil body and slurry on a tunnel face cannot leak out of the tunnel portal and water and sand gushes is avoided. And according to the shield construction process, the process of dismantling the negative ring of the shield is started at intervals after the tunneling is finished, the grouting reinforcement range at the back of the segment is limited, and the channel which gushes water and sand can be quickly diffused due to time and pressure, and is more difficult in risk control. Therefore, the gap at the position of the reinforced tunnel door is blocked in advance, and the safety risk is ensured.

The existing tunnel portal sealing mechanism mainly comprises an annular curtain cloth rubber plate, an annular pressing plate and a hinge plate, wherein the annular curtain cloth rubber plate is fixed on the outdoor annular outer side wall of an initial tunnel portal of an excavated tunnel, the inner diameter of the annular curtain cloth rubber plate is smaller than the diameter of a shield machine shell, the annular pressing plate is buckled and pressed on the outer ring of the annular curtain cloth rubber plate, and the hinge plate is uniformly distributed on the outer side surface of the annular pressing plate along the circular arc of the outer circle. However, the conventional sealing device of the cord fabric, the ring plate and the folding plate can only achieve the sealing effect in a stable soil layer, and in complex strata with high water content such as a sand layer, a pebble layer and the like, the conventional sealing mechanism often leaks to different degrees, even causes the loss of personnel, equipment and the like; particularly, when the shield is in a sandy soil layer during starting or receiving, the sandy soil layer is disturbed and then easily instable to cause soil collapse, the pressure of the collapsed soil is very high, and the sealing mechanism is easily caused to fall off from the outer annular outer side wall outside the door of the starting tunnel, so that the sealed pressure-maintaining soil environment of the whole shield is damaged, the ground above the shield tunnel is directly induced to have larger settlement, and great potential safety hazards are completely brought to the starting of the shield. In addition, because the existing underground construction is more, various complex pipelines or existing lines can exist at the end position, and the like, the settlement needs to be controlled more strictly in the shield construction process, otherwise, the leakage and explosion of the pipelines, the settlement deformation of the existing lines or the stoppage and the like can be finished. In addition to the sealing structure of the cord fabric, the ring plate and the folding plate, shield tail brush type sealing and steel plate type sealing are adopted in a plurality of published technologies at present, but the basic principle of the sealing devices is similar to that of a shield original sealing device, the sealing is carried out by depending on the elasticity or the sealing performance of grease, and the integral sealing effect can be optimal; and after shield structure construction is accomplished, need fill to the clearance that exists between door ring of the hole and the section of jurisdiction, current seal structure need set up the slip casting pipe alone and fill, and the part of filling can not be even as an organic whole with the section of jurisdiction moreover, and stability is relatively poor.

In addition, the folding pressing plate in the existing shield starting sealing structure is formed by a fixed plate and a folding plate through hinges, in the shield process, thrust is provided for rubber curtain cloth through the folding plate, so that the rubber curtain cloth is tightly attached to the shield machine to achieve the purpose of water stopping, only the rubber curtain cloth is tightly attached to the shield machine in the whole water stopping process, the folding plate is not in tight contact with a shield machine shell, in addition, the folding plate only can provide pressure for the curtain cloth through elasticity of the hinge part, the pressure is too small, the sealing effect cannot be achieved frequently, and the folding plate of the existing water stopping structure is easy to turn over or break.

Disclosure of Invention

The utility model discloses problem to prior art exists provides a combination formula magnetism portal sealing device for shield constructs originated, and this sealing device adopts magnetic steel board and the book page board after improving, curtain cloth to combine, seals many times through flexible and rigid seal member, has guaranteed sealed effect, can solve the shield and construct and seal the problem under gushing water and gush sand volume too big complicated geology operating mode, improves the security that the shield constructs and originates.

In order to reach above-mentioned technical purpose, the utility model provides a combination formula magnetism portal sealing device for shield structure is originated, combination formula magnetism portal sealing device is including installing the pre-buried portal ring of the portal department of originating at the shield structure, and the tube-shape ring body of pre-buried portal ring is pre-buried at the interior anchor ring of the portal of originating, and its outer crown plate is pre-buried forms the bearing structure of cross-section for horizontal L type at the outer terminal surface of portal, its characterized in that: the sealing device comprises a flexible sealing component arranged on the outer side surface of the outer ring plate of the door ring of the pre-buried hole and a magnetic sealing component arranged in the cylindrical ring body; the flexible sealing component comprises an annular rubber cord fabric, an annular pressing plate and a plurality of folding pressing plates, wherein the annular rubber cord fabric is arranged on the outer side of the outer ring plate and is fixed on the outer ring plate by locking bolts after being pressed tightly by the annular pressing plate and the plurality of folding pressing plates; the magnetic sealing component comprises an annular elastic telescopic plugging steel plate, a tightening device, a magnetic steel sheet arranged on an inner ring of the elastic telescopic plugging steel plate and a magnetic steel sheet cleaning device, the elastic telescopic plugging steel plate is welded on the inner ring surface of the cylindrical ring body, the magnetic steel sheet is an arc sheet with the radian matched with that of the shield machine shell, and the magnetic steel sheet is adsorbed with the steel sheet on the back of the shield machine shell or an originating pipe piece to form a sealing structure when the shield is originated; the tightening device comprises a tightening mechanism and a tightening steel wire rope, the tightening mechanism is arranged on the outer side of the portal, and the tightening steel wire rope extends into the inner side of the pre-buried portal ring and is connected with the magnetic steel sheet; under the action of the tightening mechanism, the tightening steel wire rope drives the magnetic steel discs of the two elastic telescopic plugging steel plates to circumferentially contract outwards; the cleaning device comprises a cleaning main pipe embedded in the side wall of the end head of the tunnel door, a telescopic pipe arranged in the elastic telescopic plugging steel plate and a cleaning hole formed in the magnetic steel plate, wherein the outer end of the cleaning main pipe is arranged outside the tunnel door and is provided with a grouting and inflating joint, the inner end of the cleaning main pipe extends into the inner side of the cylindrical ring body and is communicated with the inlet end of the telescopic pipe in the elastic telescopic plugging steel plate in a sealing manner, and the outlet end of the telescopic pipe in the elastic telescopic plugging steel plate is communicated with the cleaning hole in the magnetic steel plate in a sealing manner.

The utility model discloses further technical scheme: the folding pressing plate comprises a circumferential fixing plate, a folding plate and a back pressure plate, the upper edge and the lower edge of the folding plate are respectively hinged with the circumferential fixing plate and the back pressure plate, the folding pressing plate is arranged outside the annular pressing plate in a pressing mode through the circumferential fixing plate, the annular pressing plate and the annular rubber cord fabric are fixed on the outer ring plate through locking bolts, the folding plate is arranged on the outer surface of the annular rubber cord fabric in a pressing mode, an elastic component connected with the back pressure plate is arranged on the face, far away from the annular rubber cord fabric, of the folding plate, and a pull rope or a pull rope connecting piece is arranged on the back pressure plate.

The utility model discloses better technical scheme: the distance between the two elastic telescopic plugging steel plates is 30-50 cm, and a tightening device and a magnetic steel sheet cleaning device of the two elastic telescopic plugging steel plates are shared; the inner end of the cleaning main pipe is respectively connected with the telescopic pipes in the two elastic telescopic plugging steel plates in a sealing way through the cleaning branch pipes, and the telescopic pipe in each elastic telescopic plugging steel plate is communicated with the cleaning hole on the corresponding magnetic steel sheet in a sealing way.

The utility model discloses better technical scheme: one side of the annular rubber curtain cloth close to the embedded opening door ring is provided with a plurality of burrs, and grease balls are hung on the burrs and are fixed through the net piece.

The utility model discloses better technical scheme: the anti-overturning device is characterized in that a plurality of thrust plates are arranged on the surface, not connected with the folding plate, of the back pressure plate, the heights of the thrust plates are sequentially increased from the free end of the back pressure plate to the connecting end of the back pressure plate and the folding plate, anti-overturning blocking ribs are arranged on the outer side of the connecting part of the annular fixing plate and the folding plate, and the anti-overturning blocking ribs are arranged on the longitudinal middle dividing line of the annular fixing plate; the elastic component is a compression spring, two ends of the elastic component are respectively fixed on the folding plate and the counter pressing plate, and the fixed parts of the elastic component are far away from the hinge parts of the folding plate and the counter pressing plate.

The utility model discloses better technical scheme: the elastic telescopic plugging steel plate consists of 6-8 arc telescopic steel plates; each arc-shaped telescopic steel plate comprises three layers of sleeved telescopic steel plates from outside to inside, a telescopic spring is arranged between each layer of telescopic steel plate and the telescopic sleeve of the telescopic steel plate, the circumferential length of the magnetic steel plate is smaller than that of the inner layer of telescopic steel plate, the telescopic steel plate is arranged at the middle part of the inner ring of the inner layer of telescopic steel plate, and a sealing cushion layer with the same thickness as the magnetic steel plate is arranged at the part of the inner ring of the inner layer of telescopic steel plate, which is not provided with the magnetic; the telescopic pipes are arranged between each layer of telescopic steel plate and the telescopic sleeves thereof, and through holes communicated with the telescopic pipes and the cleaning holes are correspondingly formed in the outer layer steel plate sleeve, the middle layer steel plate sleeve and the inner layer telescopic steel plate.

The utility model discloses better technical scheme: the grouting and inflating joint at the outer end of the cleaning main pipe is connected with an inflating device before shield starting, impurities on one side, close to the shield shell, of the magnetic steel sheet are eliminated through inflation, and after the shield starting is finished, the grouting and inflating joint is connected with the grouting device for grouting; and two ends of the cleaning branch pipe are respectively provided with a grouting opening with a pressure control valve, and the pressure of the pressure control valve at the grouting opening is greater than the inflation pressure and less than the grouting pressure.

The utility model discloses better technical scheme: each arc-shaped telescopic steel plate is provided with a tightening device and a set of magnetic steel sheet cleaning device in a matched manner, a sealing through hole is formed in the position, close to the outer end joint, of the cleaning main pipe, the end part of a tightening steel wire rope of each tightening device is provided with a fixed sleeve matched with the cleaning hole of the magnetic steel sheet, the tightening steel wire rope is fixedly installed at the hole opening of the cleaning hole through the fixed sleeve at the end part of the tightening steel wire rope, the other end of the tightening steel wire rope extends into the cleaning branch pipe and the cleaning main pipe along a through hole and a telescopic pipe in the telescopic steel plate, the tightening steel wire rope extends out of the sealing through hole and then extends out of the hole door end face to be; the tightening mechanism adopts a chain block.

The utility model discloses better technical scheme: the middle level steel sheet cover and the inlayer steel sheet both sides that stretch out and draw back of every arc steel sheet are equipped with the sponge sealing strip respectively, correspond at the both sides terminal surface of middle level steel sheet cover and inlayer steel sheet that stretches out and draws back and have seted up the sealing strip embedded groove, the sponge sealing strip when two steel sheets that stretch out and draw back are the contraction state, imbed in the sealing strip embedded groove that corresponds to when the steel sheet that stretches out and draws back, with the clearance seal between two adjacent arc steel sheets that stretch out and draw back.

The utility model has the advantages that:

(1) the utility model discloses a portal sealing device includes flexible sealing member and twice rigid seal spare one, and rigid seal structure adopts the telescopic shutoff steel sheet of elasticity, and its steel sheet is equipped with the magnetism steel sheet with shield body contact surface, and the shutoff is adsorbed to the clearance very first time of shield body back taper design that can be fine, forms seal structure, and it is sealed effectual, and in addition flexible sealing member can avoid the shield to construct the in-process of originating and appear gushing water and gush sand accident.

(2) The utility model provides a shutoff steel sheet is telescopic steel sheet, can match the diameter of two kinds of differences of shield structure machine and section of jurisdiction to be equipped with constriction device, realize the guard action of steel sheet structure, at the shield structure tunnelling in-process, accessible constriction device makes it break away from the shield body for an external force of magnetic steel sheet, avoids the shield structure machine to move forward at tunnelling in-process casing, because the magnetism effort leads to the shutoff steel sheet to appear the desolder or warp.

(3) The utility model discloses a flexible steel sheet is equipped with the three-layer, through spring coupling between the adjacent two-layer steel sheet, and the effect of spring is in order to overcome the inhomogeneous between the building space, protects to the shield body, section of jurisdiction respectively according to the shield tunnelling position step by step, adds at the intrados of third layer steel sheet simultaneously and establishes the sealing strip for the effect after the shutoff is better.

(4) The utility model discloses well flexible sealing member comprises folding board and curtain cloth, its folding board sets to elasticity double-folding board, increase a back pressure board in original folding board structure, the back pressure board utilizes spring assembly and folding board structure to link to each other, increase folding board's pressure, and back welding thrust plate structure at back pressure board, back welding thrust plate at back pressure board, it is perpendicular with folding board, the outside extruded in-process of curtain cloth, make the better parcel section of jurisdiction of folding board, it is sealed to form, the shutoff performance of folding board has been strengthened, and be equipped with on folding board and prevent turning over the fender muscle, can reduce the possibility of turning up or breaking.

(5) The utility model discloses curtain cloth in the well flexible sealing member increases the burr to hang the grease ball, cover the net piece structure, form the complete ring at last and seal, make full use of grease water-proof property forms waterproof barrier one, plays sealed effect at last in the shield structure work progress, has reduced the trouble that shield tail brush welding was assembled, paints the grease process simplification simultaneously.

(6) The plugging steel plate in the utility model is also provided with a magnetic steel sheet cleaning pipeline, so that impurities on the magnetic steel sheet adsorption surface can be washed away through the ventilation of the pipeline, and the plugging steel plate can be tightly adsorbed with a corresponding structure; and after the shield starting is finished, grouting can be performed through the pipeline, the steel plate is used as a reinforcing piece, and high-strength mortar or concrete is injected, so that the structure is more stable, and the stress balance of the side wall of the shield end well is facilitated.

Drawings

FIG. 1 is a schematic structural diagram of the present invention before shield initiation;

FIG. 2 is a schematic structural diagram of the present invention during shield launching;

FIG. 3 is a schematic view of the annulus of the elastic telescopic plugging steel plate;

FIG. 4 is a schematic structural view of a single arc-shaped expansion steel plate;

FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;

FIG. 6 is a cross-sectional view taken along line B-B of FIG. 4;

FIG. 7 is a cross-sectional view taken along line C-C of FIG. 4;

FIG. 8 is a cross-sectional view taken along line D-D of FIG. 4;

FIG. 9 is an enlarged view of the end of a single piece of arcuate telescoping steel plate;

FIG. 10 is a schematic structural diagram of a pipeline of the magnetic steel sheet cleaning device;

FIG. 11 is a schematic structural view of a middle folding plate according to the present invention;

FIG. 12 is a schematic view of an annulus of a flexible seal;

FIG. 13 is a cross-sectional view of an annular rubber cord;

FIG. 14 is a schematic view of an alternate face of the annular rubber cord;

FIG. 15 is a schematic diagram of the shield when two elastic telescopic plugging steel plates are in contact with the shield body and the originating pipe piece respectively.

In the figure: 1-pre-buried hole door ring, 100-cylindrical ring body, 101-outer ring plate, 2-annular rubber cord fabric, 200-burr, 201-grease ball, 202-mesh, 3-annular pressing plate, 4-folding pressing plate, 400-annular fixing plate, 401-folding plate, 402-counter pressing plate, 403-elastic component, 404-pulling rope, 405-pulling rope connecting piece, 406-thrust plate, 407-anti-turnover blocking rib, 5-cleaning device, 500-grouting opening, 501-cleaning main pipe, 5011-sealing perforation, 502-cleaning hole, 503-grouting and inflation joint, 504-cleaning branch pipe, 505-telescopic pipe, 6-locking bolt, 7-elastic telescopic blocking steel plate, 700-telescopic spring, 701-inner telescopic steel plate, 702-sealing cushion layer, 703-outer steel plate sleeve, 704-middle steel plate sleeve, 705-sponge sealing strip, 706-embedded groove, 707-through hole, 8-magnetic steel plate, 9-a tightening device, 900-a tightening mechanism, 901-a tightening steel wire rope, 9011-a fixed sleeve, 10-a shield machine shell, 11-a tunnel portal end side wall and 12-an initial segment.

Detailed Description

The present invention will be further explained with reference to the drawings and examples. Fig. 1 to 15 are drawings of the embodiment, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiment of the present invention. The following detailed description of the embodiments of the present invention is presented in the drawings and is not intended to limit the scope of the invention as claimed. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are merely for convenience of description of the present invention and simplifying the description, but do not indicate or imply that the device or element that is referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

The embodiment provides a combined type magnetic tunnel portal sealing device for shield starting, as shown in fig. 1 and fig. 2, the combined type magnetic tunnel portal sealing device comprises an embedded tunnel portal ring 1 installed at a shield starting position, a cylindrical ring body 100 of the embedded tunnel portal ring 1 is embedded in an inner ring surface of a starting tunnel portal, an outer ring plate 101 of the embedded tunnel portal ring is embedded in an outer end surface of the tunnel portal to form a supporting structure with a transverse L-shaped cross section, and the combined type magnetic tunnel portal sealing device is characterized in that: the sealing device comprises a flexible sealing component arranged on the outer side surface of an outer ring plate 101 of a door ring of the pre-buried hole and a magnetic sealing component arranged in a cylindrical ring body 100, wherein the magnetic sealing component comprises an annular elastic telescopic plugging steel plate 7, a tightening device 9, a magnetic steel sheet 8 arranged on the inner ring of the elastic telescopic plugging steel plate 7 and a magnetic steel sheet cleaning device 5, the elastic telescopic plugging steel plate 7 is provided with two channels, the distance between the two elastic telescopic plugging steel plates 7 is 30-50 cm, and the tightening device and the magnetic steel sheet cleaning device of the two elastic telescopic plugging steel plates 7 are shared; the elastic telescopic plugging steel plate 7 is welded on the inner annular surface of the cylindrical ring body 100, the magnetic steel sheet 8 is an arc-shaped sheet with the radian matched with that of the shield machine shell 10, and the arc-shaped sheet is adsorbed with the steel plate on the back of the shield machine shell 10 or the starting segment 12 to form a sealing structure when the shield machine starts.

The flexible sealing member in the embodiment is shown in fig. 1, fig. 2 and fig. 11, and comprises an annular rubber cord fabric 2, an annular pressing plate 3 and a plurality of folding pressing plates 4, wherein the folding pressing plates 4 comprise a ring-shaped fixing plate 400, a folding plate 401 and a back-pressure plate 402, and the upper edge and the lower edge of the folding plate 401 are respectively hinged with the ring-shaped fixing plate 400 and the back-pressure plate 402; the folding pressing plate 4 is pressed outside the annular pressing plate 3 through the annular fixing plate 400, the annular pressing plate 3 and the annular rubber curtain cloth 2 are fixed on the outer annular plate 101 through the locking bolts 6, the folding plate 401 is pressed on the outer surface of the annular rubber curtain cloth 2, an elastic member 403 connected with the back pressure plate 402 is arranged on one surface, away from the annular rubber curtain cloth 2, of the folding plate 401, and a pull rope 404 or a pull rope connecting piece 405 is arranged on the back pressure plate 402. A plurality of thrust plates 406 are arranged on the non-connection surface of the back pressure plate 402 and the folding plate 401, the heights of the thrust plates 406 are sequentially increased from the free end of the back pressure plate 402 to the connection end of the back pressure plate and the folding plate 401, an anti-overturn blocking rib 407 is arranged on the outer side of the connection part of the annular fixing plate 400 and the folding plate 401, and the anti-overturn blocking rib 407 is arranged on the longitudinal midline of the annular fixing plate 400; the elastic member 403 is a compression spring, and two ends of the elastic member are respectively fixed on the folding plate 401 and the counter plate 402, and the fixed parts are far away from the hinge part of the folding plate 401 and the counter plate 402. In the embodiment, as shown in fig. 13 and 14, the annular rubber cord fabric 2 is provided with a plurality of burrs 200 on one side close to the door ring 1 of the pre-buried hole, the burrs 200 are implanted into the cord fabric in the preparation process of the annular rubber cord fabric in a rib implanting mode and are integrated with the cord fabric, grease balls 201 are hung on the burrs 200 and are fixed through a mesh 202, the mesh 202 can be directly hung on the burrs 200, grease is adsorbed on the grease balls 201, certain viscosity is achieved, and the mesh 202 cannot fall off randomly; the annular rubber cord fabric 2 in the embodiment is hung with the grease ball 201, so that a good sealing effect is formed after extrusion, and meanwhile, a filtering and retaining effect is realized on a stratum, and sand loss is avoided.

In the embodiment, each elastic telescopic plugging steel plate 7 is composed of 6 arc-shaped telescopic steel plates as shown in fig. 3, and the angle of each arc-shaped telescopic plate is 60 degrees; each arc-shaped telescopic steel plate comprises three layers of sleeved telescopic steel plates from outside to inside as shown in fig. 4 to 8, a telescopic spring 700 is arranged between each layer of telescopic steel plate and the telescopic sleeve, the circumferential length of the magnetic steel sheet 8 is smaller than that of the inner layer telescopic steel plate 701 and is arranged at the middle part of the inner ring of the inner layer telescopic steel plate 701, and a rubber sealing cushion layer 702 with the same thickness as that of the magnetic steel sheet 8 is arranged at the part, not provided with the magnetic steel sheet 8, of the inner ring of the inner layer telescopic steel plate 701. The middle layer steel plate sleeve 704 and the inner layer telescopic steel plate 701 both sides of every arc telescopic steel plate are equipped with sponge sealing strip 705 respectively, and sealing strip embedded groove 706 has been seted up to the both sides terminal surface correspondence of middle layer steel plate sleeve 704 and inner layer telescopic steel plate 701, sponge sealing strip 705 when two telescopic steel plates are the shrink state, in the corresponding sealing strip embedded groove 706 of embedding to when the telescopic steel plate stretches out the state, with the clearance seal between two adjacent arc telescopic steel plates.

In the embodiment, each arc-shaped telescopic steel plate is provided with a tightening device and a set of magnetic steel plate cleaning device in a matching manner, as shown in fig. 1 and fig. 2, the cleaning device 5 comprises a cleaning main pipe 501 pre-embedded in the portal end side wall 11, a cleaning branch pipe 504 installed on the inner side of the cylindrical ring body 100, a telescopic pipe 505 arranged in the elastic telescopic blocking steel plate 7 and a cleaning hole 502 formed in the magnetic steel plate 8, the outer end of the cleaning main pipe 501 is arranged on the outer side of the portal, and is provided with a grouting and inflating joint 503, the inner end of the cleaning main pipe extends into the inner side of the cylindrical ring body 100 and is respectively connected with the telescopic pipes 505 in the two elastic telescopic blocking steel plates 7 in a sealing manner through the cleaning branch pipe 504, and the telescopic pipe 505 in each elastic telescopic blocking steel plate 7 is communicated with the cleaning hole 502 on the. As shown in fig. 4, 5 and 10, the telescopic pipe 505 is disposed between each layer of telescopic steel plate and the telescopic sleeve thereof, the telescopic pipe 505 can be a corrugated pipe or a sleeve type telescopic pipe, and can automatically extend and retract, and through holes 707 communicated with the telescopic pipe 505 and the cleaning hole 502 are correspondingly formed on the outer layer steel plate sleeve 703, the middle layer steel plate sleeve 704 and the inner layer telescopic steel plate 701; the telescopic pipe 505, the through hole 707 and the cleaning hole 502 are all arranged at the center of the magnetic steel sheet 8 and are arranged on the same straight line to form a communicated cleaning pipeline, and are communicated with the cleaning main pipe 501 through the cleaning branch pipe 504, and impurities on the inner annular surface of the magnetic steel sheet 8 are often removed in a ventilation mode, so that the magnetic steel sheet can keep better magnetism, and can be adsorbed on the outer wall of the shield machine shell 10 or the shield segment to perform good sealing.

In the embodiment, the tightening device matched with each arc-shaped telescopic steel plate is shown in fig. 1 and fig. 2, and comprises a tightening mechanism 900 and a tightening steel wire rope 901 which are arranged on the outer side of the tunnel door, wherein the tightening mechanism 900 adopts a chain block, so that the installation and the use are convenient. In order to facilitate installation of the tightening steel wire rope 901, a sealing through hole 5011 is formed in the position, close to the outer end connector, of the cleaning main pipe 501, a sealing rubber ring is arranged at the position of the sealing through hole 5011, other existing sealing structures can be adopted, the phenomenon that the cleaning main pipe 501 leaks air is avoided, the sealing through hole 5011 can be attached to the inner wall of the installation hole when the cleaning main pipe 501 is installed, and the phenomenon that the air leaks air can be avoided; the end of a tightening steel wire rope 901 of each tightening device is provided with a fixed sleeve 9011 matched with the cleaning hole 502 of the magnetic steel sheet 8, the tightening steel wire rope 901 is fixedly installed at the orifice of the cleaning hole 502 through the fixed sleeve 9011 at the end, the other end of the tightening steel wire rope 901 extends into the cleaning branch pipe 504 and the cleaning main pipe 501 along a through hole 707 and a telescopic pipe 505 in the telescopic steel plate, penetrates out of a sealing through hole 5011 and then extends out of the end face of the hole door to be connected with a tightening mechanism 900, and the tightening mechanism 900 controls the tightening steel wire rope 901 to drive the magnetic steel sheet 8 to move annularly. The utility model provides a tighten up wire rope 901 intercommunication cleaning device and install together.

The cleaning device 5 in the embodiment can perform grouting after the shield starting is completed except that the cleaning device is inflated to clean impurities on the inner ring surface of the magnetic steel sheet 8, in order to facilitate grouting, grouting ports 500 with pressure control valves are respectively arranged at two ends of the cleaning branch pipe 504, the pressure of the pressure control valve at the grouting port 500 is greater than the inflation pressure and is less than the grouting pressure, when the grouting and inflation connector 503 at the outer end of the cleaning main pipe 501 is connected with an inflation device to clean impurities, the pressure control valve at the grouting port 500 is in a closed state, and when the shield starting is completed and the shield starting is connected with the grouting device to perform grouting, the pressure control valve at the position reaches a set pressure and is automatically opened to perform grouting.

The utility model discloses installing before the shield constructs the inception, specifically being reinforced and accomplish at the shield end, arranging the horizontal hole of visiting according to "rice" font on the portal reinforcing body, whether possess the condition of abolishing the portal according to the complete degree determination of getting the core, when the portal possesses the condition of abolishing, accomplish the shield and construct the preparation work before the inception, bracket installation location of initiating, shield constructs the quick-witted lower well equipment debugging of machine, begins to install portal sealing device, concrete steps are as follows:

(1) stud bolts are arranged in reserved bolt grooves of an outer ring plate 101 of an embedded opening door ring 1, then an annular rubber curtain cloth 2 with a burr structure is arranged on the outer ring plate 101, an arc-shaped steel plate is arranged to form an annular pressing plate 3, finally a folding plate 4 is arranged, and a back pressure plate 402 of the folding plate 4 is hung on the stud bolts through a pull rope 404 so that a spring is in a compression state, as shown in figure 1, the back pressure plate is prevented from being extruded when a shield machine enters the opening;

(2) installing a fixed sleeve 9011 at the end part of a tightening steel wire rope 901 of a tightening device 9 of each arc-shaped telescopic steel plate into a cleaning hole 502 of a magnetic steel sheet 8 of an elastic telescopic plugging steel plate 7, and penetrating the tightening steel wire rope 901 out of a telescopic pipe 505 and a through hole 707 in the elastic telescopic plugging steel plate 7; drilling a pre-buried hole of a cleaning main pipe 501 on a portal end side wall 11, fixedly connecting the cleaning main pipe 501 and a cleaning branch pipe 504 of a cleaning device, extending a tightening steel wire rope 901 penetrating out of an elastic telescopic plugging steel plate 7 into the cleaning branch pipe 504 and the cleaning main pipe 501, penetrating out of a sealing through hole 5011 on the cleaning main pipe 501, fixing the tightening steel wire rope 901 on an inflation and grouting port of the cleaning main pipe 501, penetrating the cleaning main pipe 501 connected with the tightening steel wire rope 901 out of the portal end side wall 11 from the pre-buried hole pre-drilled on the portal end side wall 11, fixing the tightening steel wire rope 901 on the end of the inflation and grouting port of the cleaning main pipe 501, disconnecting the end of the inflation and grouting port from a chain block fixed on the portal end side wall 11, and installing an inflation and grouting joint at the port of the cleaning main pipe 501; the arc-shaped telescopic steel plate is welded on the cylindrical ring body 100, the telescopic pipe 505 and the through hole 707 on the arc-shaped telescopic steel plate are ensured to be in butt joint with the branch hole on the cleaning branch pipe 504 in the welding process, and the cleaning branch pipe 504 can be embedded into the cylindrical ring body 100 or a clamping groove is arranged at the welding part of the arc-shaped telescopic steel plate in order not to influence the welding of the arc-shaped telescopic steel plate. The installation modes of the six arc-shaped telescopic steel plates and the corresponding contraction devices are similar to those of the cleaning devices, and when the six arc-shaped telescopic steel plates are welded and assembled, the areas 60 degrees below the six arc-shaped telescopic steel plates need to be avoided, so that the inconvenience in construction and operation is avoided.

(3) Before the portal is broken, greasing the handle into small balls, hanging the small balls on the portal curtain cloth, completing the range of 70% of the upper part in the first stage, and installing a net structure to form a whole and prevent falling; before the last cutting of the steel bars on the soil facing surface, the residual 30 percent of the range is finished according to the method, so that stones are prevented from being left in the grease in the breaking process and finally penetrating through the cord fabric; the process of breaking the tunnel portal is mostly carried out manually, and the plain concrete structure can be cut and ground by a shield machine.

(4) After the tunnel portal is broken and before the shield starts, the telescopic steel plate is retracted through the tightening device, so that the shield machine can normally pass through the tunnel portal; starting shield tunneling, and when a shield cutterhead is in contact with a folding plate 401 of a folding plate structure, removing the connection between a counter pressing plate 402 and a stud bolt, so that the counter pressing plate 402 is in contact with a shield body to carry out flexible sealing; the door curtain cloth and the folding plate structure play a role in temporary flexible sealing in the whole starting process;

(5) the shield continues to advance, when the shield machine reaches the position of the magnetic steel sheets 8 and starts to assemble after the shield machine finishes one ring of tunneling, as shown in fig. 2, the tightening device 9 is loosened to enable the magnetic steel sheets 8 of the two elastic telescopic plugging steel plates 7 to be adsorbed on the shield machine shell 10 to form a sealing structure, and then negative ring pipe sheet assembly is carried out under the protection of the shield tail shell; before adsorption, air can be added into the cleaning main pipe 501 by using an air compressor system, and impurities on the contact surface of the magnetic steel plate 8 and the shield machine shell are removed, so that the adsorption effect is better;

(6) before each ring of shield segments of the shield tunneling machine continuously advances after being assembled, the steel wire rope 901 is tightened to outwards contract the two elastic telescopic plugging steel plates 7 at the same time, so that the magnetic steel sheets 8 of the two elastic telescopic plugging steel plates 7 temporarily leave the shield body 9, the general contraction value is controlled to be about 1cm, the magnetic steel sheets 8 are separated from the shield body 9, and the shield tunneling machine is prevented from dragging and deforming the arc-shaped steel plates in the forward moving process and losing the telescopic effect.

(7) Repeating the step (5) and the step (6) until the shield machine completely enters the stratum, so that the rope steel plate does not move to form permanent rigid seal and is not removed after the magnetic steel sheets 8 of the two elastic telescopic plugging steel plates 7 are in contact with the starting ring pipe sheet 12; in the process, when the shield is in contact with the originating segment 2 from the first elastic telescopic plugging steel plate 7 and the second elastic telescopic plugging steel plate 7 is in contact with the shield body 8, as shown in fig. 15, under the action of the telescopic springs 700 of the elastic telescopic plugging steel plates 7, the two elastic telescopic plugging steel plates 7 can respectively protect the shield body and the segment according to the shield tunneling position; meanwhile, when the shield tail enters the end side wall, the back pressure plate is tightly pressed on the outer surface of the pipe by the spring to form a reinforcing structure, so that the failure of the conventional folding plate is avoided; after the starting ring pipe piece 12 is separated from the shield tail, the contact surface of the magnetic steel piece 8 is cleaned again by air filling of the air compressor.

(8) After the shield starting is finished, the cleaning branch pipe 504 and the cleaning main pipe 501 are used as grouting pipelines to fill a building gap to form a permanent structure; the pressure is greater than the inflation pressure in the slip casting process, and the pressure value of clearance bleeder 504 both ends pressure valve satisfies the inflation in-process sealed, opens in the slip casting process, and in the slip casting process, clearance bleeder 504 both ends pressure valve is opened, can fill the building space of portal position finally fully, and wherein the slip casting material can be high strength concrete or biliquid thick liquid.

The utility model provides a hole door curtain cloth and folding plate structure are whole in-process of starting as interim flexible seal, treat whole construction flow of starting to remove after finishing.

To sum up, for the utility model discloses an embodiment of listing, nevertheless the utility model discloses not only be limited to above-mentioned embodiment, as long as reach with any same or similar means the technical effect of the utility model, all should belong to the scope of the protection of the utility model.

Claims (9)

1. The utility model provides a combination formula magnetism portal sealing device for shield structure is originated, is including installing pre-buried portal ring (1) at shield structure originating portal department, and pre-buried cylindrical ring body (100) of pre-buried portal ring (1) are pre-buried at the interior anchor ring of originating portal, and its outer annular plate (101) are pre-buried and form the bearing structure that the cross-section is horizontal L type at the outer terminal surface of portal, its characterized in that: the sealing device comprises a flexible sealing component arranged on the outer side surface of an outer ring plate (101) of the door ring of the pre-buried hole and a magnetic sealing component arranged in the cylindrical ring body (100); the flexible sealing component comprises an annular rubber cord fabric (2), an annular pressing plate (3) and a plurality of folding pressing plates (4), wherein the annular rubber cord fabric (2) is arranged on the outer side of the outer ring plate (101), and is tightly pressed by the annular pressing plate (3) and the plurality of folding pressing plates (4) and then fixed on the outer ring plate (101) by locking bolts (6); the magnetic sealing component comprises an annular elastic telescopic plugging steel plate (7), a tightening device (9), a magnetic steel sheet (8) arranged on the inner ring of the elastic telescopic plugging steel plate (7) and a magnetic steel sheet cleaning device (5), the elastic telescopic plugging steel plate (7) is welded on the inner ring surface of the cylindrical ring body (100), the magnetic steel sheet (8) is an arc sheet with the radian matched with that of the shield machine shell (10), and the arc sheet is adsorbed with the shield machine shell (10) or the steel sheet at the back of an originating pipe sheet (12) to form a sealing structure when the shield machine originates; the tightening device comprises a tightening mechanism (900) and a tightening steel wire rope (901) which are arranged on the outer side of the hole door, the tightening steel wire rope (901) extends into the inner side of the pre-buried hole door ring (1) to be connected with the magnetic steel sheet (8), and under the action of the tightening mechanism (900), the tightening steel wire rope (901) drives the magnetic steel sheet (8) of the two elastic telescopic plugging steel plates (7) to circumferentially contract outwards; cleaning device (5) are responsible for (501), flexible pipe (505) of setting in flexible telescopic shutoff steel sheet (7) and set up clearance hole (502) on magnetic steel sheet (8) including the pre-buried clearance in portal end side wall (11), the clearance is responsible for (501) outer end and arranges the portal outside in to be equipped with slip casting and gas filled joint (503), the inner stretch into tube-shape ring body (100) inboard and with flexible pipe (505) entrance point sealing intercommunication in flexible telescopic shutoff steel sheet (7), the exit end of flexible pipe (505) in flexible telescopic shutoff steel sheet (7) and clearance hole (502) sealing intercommunication on magnetic steel sheet (8).

2. The combined magnetic tunnel portal sealing apparatus for shield initiation of claim 1, wherein: the folding pressing plate (4) comprises a circumferential fixing plate (400), a folding plate (401) and a back pressing plate (402), the upper edge and the lower edge of the folding plate (401) are respectively hinged with the circumferential fixing plate (400) and the back pressing plate (402), the folding pressing plate (4) is pressed outside the annular pressing plate (3) through the circumferential fixing plate (400), the annular pressing plate (3) and the annular rubber curtain cloth (2) are fixed on the outer annular plate (101) through locking bolts (6), the folding plate (401) is pressed on the outer surface of the annular rubber curtain cloth (2), an elastic component (403) connected with the back pressing plate (402) is arranged on one surface, far away from the annular rubber curtain cloth (2), of the folding plate (401), and a pull rope (404) or a pull rope connecting piece (405) is arranged on the back pressing plate (402).

3. A combined magnetic tunnel portal sealing device for shield initiation according to claim 1 or 2, wherein: the elastic telescopic plugging steel plates (7) are arranged twice, the distance between the two elastic telescopic plugging steel plates (7) is 30-50 cm, and a tightening device and a magnetic steel sheet cleaning device of the two elastic telescopic plugging steel plates (7) are shared; the inner side of the cylindrical ring body (100) is provided with a cleaning branch pipe (504), the inner end of the cleaning main pipe (501) is respectively connected with telescopic pipes (505) in two elastic telescopic plugging steel plates (7) in a sealing way through the cleaning branch pipe (504), and the telescopic pipe (505) in each elastic telescopic plugging steel plate (7) is communicated with a cleaning hole (502) on the corresponding magnetic steel plate (8) in a sealing way.

4. A combined magnetic tunnel portal sealing device for shield initiation according to claim 1 or 2, wherein: one side of the annular rubber cord fabric (2) close to the embedded door ring (1) is provided with a plurality of burrs (200), grease balls (201) are hung on the burrs (200) and are fixed through meshes (202).

5. The combined magnetic tunnel portal sealing apparatus for shield launch according to claim 2, wherein: a plurality of thrust plates (406) are arranged on the non-connection surface of the back pressure plate (402) and the folding plate (401), the heights of the thrust plates (406) are sequentially increased from the free end of the back pressure plate (402) to the connection end of the back pressure plate and the folding plate (401), an anti-overturning blocking rib (407) is arranged on the outer side of the connection part of the annular fixing plate (400) and the folding plate (401), and the anti-overturning blocking rib (407) is arranged on the longitudinal midline of the annular fixing plate (400); the elastic member (403) is a compression spring, two ends of the compression spring are respectively fixed on the folding plate (401) and the back pressure plate (402), and the fixed parts are far away from the hinge parts of the folding plate (401) and the back pressure plate (402).

6. The combined magnetic tunnel portal sealing apparatus for shield launch according to claim 3, wherein: the elastic telescopic plugging steel plate (7) consists of 6-8 arc telescopic steel plates; each arc-shaped telescopic steel plate comprises three layers of sleeved telescopic steel plates from outside to inside, a telescopic spring (700) is arranged between each layer of telescopic steel plate and the telescopic sleeve of the telescopic steel plate, the circumferential length of the magnetic steel sheet (8) is smaller than that of the inner layer of telescopic steel plate (701), the telescopic steel plates are arranged at the middle part of the inner ring of the inner layer of telescopic steel plate (701), and a sealing cushion layer (702) with the same thickness as the magnetic steel sheet (8) is arranged at the part of the inner ring of the inner layer of telescopic steel plate (701) where the magnetic steel sheet (8) is not arranged; the telescopic pipes (505) are arranged between each layer of telescopic steel plate and the telescopic sleeves thereof, and through holes (707) communicated with the telescopic pipes (505) and the cleaning holes (502) are correspondingly formed in the outer layer steel plate sleeve (703), the middle layer steel plate sleeve (704) and the inner layer telescopic steel plate (701).

7. The combined magnetic tunnel portal sealing apparatus for shield launch according to claim 3, wherein: the grouting and inflating joint (503) at the outer end of the cleaning main pipe (501) is connected with an inflating device before shield starting, impurities on one side, close to the shield shell (10), of the magnetic steel sheet (8) are eliminated through inflation, and after the shield starting is finished, the grouting and inflating joint is connected with the grouting device for grouting; and grouting ports (500) with pressure control valves are respectively arranged at two ends of the cleaning branch pipe (504), and the pressure of the pressure control valves at the grouting ports (500) is greater than the inflation pressure and less than the grouting pressure.

8. The combined magnetic tunnel portal sealing apparatus for shield launch according to claim 6, wherein: each arc-shaped telescopic steel plate is provided with a tightening device and a set of magnetic steel plate cleaning device in a matched manner, a sealing through hole (5011) is formed in the position, close to the outer end joint, of a cleaning main pipe (501), a fixing sleeve (9011) matched with the cleaning hole (502) of the magnetic steel plate (8) is arranged at the end of a tightening steel wire rope (901) of each tightening device, the tightening steel wire rope (901) is fixedly installed at the orifice of the cleaning hole (502) through the fixing sleeve (9011) at the end of the tightening steel wire rope, the other end of the tightening steel wire rope extends into the cleaning branch pipe (504) and the cleaning main pipe (501) along a through hole (707) and a telescopic pipe (505) in the telescopic steel plate, the tightening steel wire rope penetrates out of the sealing through hole (5011) and then extends out of the end face of the hole door to be connected with the tightening mechanism (900), and the tightening; the tightening mechanism (900) adopts a chain block.

9. The combined magnetic tunnel portal sealing apparatus for shield launch according to claim 6, wherein: middle level steel sheet cover (704) and inlayer expansion plate (701) both sides of every arc expansion plate are equipped with sponge sealing strip (705) respectively, have seted up sealing strip embedded groove (706) at the both sides terminal surface correspondence of middle level steel sheet cover (704) and inlayer expansion plate (701), sponge sealing strip (705) are when two expansion plate are the shrink state, imbed in corresponding sealing strip embedded groove (706) to when expansion plate stretches out the state, with the clearance seal between two adjacent arc expansion plate.

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