CN212225220U - Shield constructs flexible connection steel sleeve mechanism that starts - Google Patents
Shield constructs flexible connection steel sleeve mechanism that starts Download PDFInfo
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- CN212225220U CN212225220U CN202021389570.1U CN202021389570U CN212225220U CN 212225220 U CN212225220 U CN 212225220U CN 202021389570 U CN202021389570 U CN 202021389570U CN 212225220 U CN212225220 U CN 212225220U
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- 238000010276 construction Methods 0.000 abstract description 23
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Abstract
The utility model relates to an underground tunnel excavation construction technical field especially relates to a shield constructs flexible connection steel sleeve mechanism that starts, including steel sleeve body, annular transition steel ring, burden ring section of jurisdiction, purpose-built section of jurisdiction, beaded girder, reaction frame that are used for suit shield constructs the machine, steel sleeve body comprises first steel sleeve unit, second steel sleeve unit and third steel sleeve unit that connect gradually along its axial, be equipped with the slip casting mouth of pipe on the outer wall of second steel sleeve unit; the steel sleeve body is formed by butt joint and combination of an upper steel cylinder and a lower steel cylinder along the circumferential direction of the steel sleeve body; the special duct piece is of an annular structure, and a flexible connecting mechanism is arranged between the outer wall of the special duct piece and the inner wall of the tail end of the third steel sleeve unit. The utility model provides a shield structure major defect on the system of starting atress system, overcome each junction of steel sleeve and annular transition steel ring and ground and link to receive the counter-force effect to produce and draw and split phenomenon, pressurize inefficacy problem between the wall.
Description
Technical Field
The utility model relates to an underground tunnel excavation construction technical field especially relates to a shield constructs flexible connection steel sleeve mechanism of originating.
Background
The urban subway construction in China is rapidly developing, and most of the construction methods of the tunnel interval between two stations adopt a shield method. When the shield machine starts to tunnel, gushing and sand flow are easy to generate at the portal opening of the tunnel, and particularly dangerous situations such as stratum collapse, submergence and the like easily occur in weak stratum and water-rich stratum, so the shield machine always starts to be the main technical difficulty of shield construction. Under the condition that the surrounding environmental conditions are good and allowable, the soil around the starting tunnel portal is usually sprayed and reinforced from the ground surface, then steel rings are arranged at the position of the tunnel portal, rubber curtain cloth and a folding and pressing plate are adopted to carry out sealing construction on the tunnel portal, and then shield starting construction is carried out. However, many engineering projects have too small construction sites, complex surrounding environments and poor geological conditions, so that the end can not be reinforced by the rotary spraying from the ground or the reinforcing effect is poor, and the requirements can not be met. Therefore, other auxiliary construction methods are considered.
The conventional shield starting steel sleeve is not mature in technology at present, a negative duct piece at the tail of a shield is in close contact with a reinforcing ring beam locally, the reinforcing ring beam is in L-shaped rigid closed connection with the tail end of the steel sleeve in a bolt or welding mode, and a plurality of jacks are arranged between the reinforcing ring beam and a reaction frame; the front end of the steel sleeve is hermetically connected with the well wall through a transition steel ring, so that the counterforce of the propulsive force generated by the shield operation is transmitted to the reinforcing ring beam through the negative pipe piece, then one part of the counterforce is transmitted to the counterforce frame for removing balance of a jack, and the other part of the counterforce frame is transmitted to the tail end of the steel sleeve through the reinforcing ring beam, so that the stress path is complex, the balance and the centering of the force are not easy to achieve, and great hidden danger is generated. Not only the steel sleeve is very easy to receive the effect of pulling and bending force, and the joint that leads to between each steel sleeve and the peripheral pre-buried crown plate of portal and steel sleeve takes place to split, damage even, and then seals, pressurize inefficacy, seepage muddy water for the engineering construction fails. In order to avoid the pulling crack of the steel sleeve, a large prepressing jacking force needs to be applied through a jack on the reaction frame, so that the technical control difficulty is increased. And the negative pipe piece is locally contacted with the reinforcing ring beam, so that the local stress of the pipe piece is very large, and the pipe piece is easy to break. The problems not only have high requirements on the rigidity of the steel sleeve material and increase the operation difficulty, but also can not practically eliminate the risk of shield launching of the currently adopted steel sleeve.
Under this background, the utility model discloses a flexonics steel sleeve does not receive the propulsive force influence that the shield structure operation produced, does not receive the influence of the preceding jack pressure operation of reinforcing ring roof beam yet, and the atress direction is unanimous, the route is clear and definite. Therefore, the defects existing in the prior art are overcome, the key breakthrough in the technology is obtained, and the construction risk is favorably reduced. And a jack group between the reinforcing ring beam and the reaction frame is not required, so that the construction cost is saved, the construction process is simplified, and the construction progress is accelerated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a shield and construct flexible connection steel sleeve mechanism of starting, do not receive the propulsive force influence that the shield structure operation produced, do not receive the influence of jack counter-force operation on the reaction frame yet, the propulsive force that the shield structure operation produced is through the section of jurisdiction directly with the reaction frame support balance. The problems that the existing shield launching system has major defects on a stress system and a steel sleeve is invalid and damaged under the action of counter force are solved.
In order to realize the utility model discloses a purpose, the utility model discloses a technical scheme do:
the utility model discloses a flexible connection steel sleeve mechanism for shield starting, which comprises a steel sleeve body for sleeving a shield machine, an annular transition steel ring, a negative ring duct piece, a special duct piece, a reinforcing ring beam with an outer square and an inner circular shape, and a reaction frame,
the annular transition steel ring is of an annular structure, one end of the annular transition steel ring is connected with the ground connecting wall, and the other end of the annular transition steel ring is connected with the front end of the steel sleeve body;
the steel sleeve body is composed of a first steel sleeve unit, a second steel sleeve unit and a third steel sleeve unit which are sequentially connected along the axial direction of the steel sleeve body, and a grouting pipe orifice is arranged on the outer wall of the second steel sleeve unit; the steel sleeve body is formed by butting and combining an upper steel cylinder and a lower steel cylinder which are in a semicircular shape along the circumferential direction of the steel sleeve body, and a base is arranged at the bottom of the lower steel cylinder;
the negative ring pipe piece is arranged on the inner side of the tail end of the shield tunneling machine, and the negative ring pipe piece, the specially-made pipe piece, the reinforcing ring beam and the reaction frame are sequentially connected;
the special duct piece is of an annular structure, and a flexible connecting mechanism is arranged between the outer wall of the special duct piece and the inner wall of the tail end of the third steel sleeve unit.
The flexible connecting mechanism comprises an outer annular steel sheet, an inner annular steel sheet and an annular water stop rubber sheet, the cross section of the outer annular steel sheet is of an inverted L-shaped structure, and the outer wall of the outer annular steel sheet is connected with the inner wall of the tail end of the third steel sleeve unit; the cross section of the inner annular steel sheet is of an L-shaped structure, the outer wall of the inner annular steel sheet is connected with an embedded steel bar arranged on the outer wall of the specially-made duct piece, and the embedded steel bar is a concrete duct piece or a steel duct piece; the annular water stop rubber sheet is arranged between the inner annular steel sheet and the outer annular steel sheet and is used for connecting the inner annular steel sheet and the outer annular steel sheet.
A plurality of fixing bolts are arranged on the outer annular steel sheet and the inner annular steel sheet at equal intervals, two rows of round holes used for the fixing bolts to penetrate are formed in the annular water stopping rubber sheet, and the fixing bolts penetrate through the round holes and are fixedly connected with the large annular steel sheet, the small annular steel sheet and the fixing nuts in a matched mode.
And the inclined strut of the reaction frame is fixedly connected with the starting well beam column or the bottom plate.
A support is arranged between the originating well beam column or the well bottom plate and the third steel sleeve unit; and the first, second and third steel sleeve unit supports are provided with ground anchors for anchoring with the well bottom plate.
The base is a trapezoidal steel frame, and the top of the base is fixedly connected with the lower steel cylinder; a long operating hole is reserved on the bottom plate of the lower steel cylinder, and a closed steel bottom plate matched with the bottom plate is arranged at the top of the bottom plate.
One end of the annular transition steel ring is connected with the underground diaphragm wall through an expansion bolt, a water stop rubber sheet is arranged between the annular transition steel ring and the underground diaphragm wall, and a sleeper used for supporting is arranged at the bottom of the annular transition steel ring.
An annular tunnel door steel plate matched with the section shape of the annular transition steel ring is pre-embedded in the underground diaphragm wall, and one end of the annular transition steel ring is welded with the annular transition steel ring.
The special segment is a concrete segment with steel bars embedded on the outer side, or a steel segment.
The reinforcing ring beam is a steel section beam with square outside and circular inside.
The transition steel ring, the first steel sleeve unit, the second steel sleeve unit and the third steel sleeve unit are sequentially connected through a flange plate, and a water-stopping rubber filler strip is arranged between the transition steel ring and the first steel sleeve unit; the upper steel cylinder and the lower steel cylinder are connected through a flange plate.
A construction method of a shield launching flexible connection steel sleeve mechanism comprises the following steps:
firstly, connecting one end of an annular transition steel ring with a ground connecting wall through an expansion bolt, arranging a water stop rubber sheet between the annular transition steel ring and the ground connecting wall for water stop, or welding the annular transition steel ring with an annular hole door annular plate, and using sleepers to pad the bottom of the annular transition steel ring;
secondly, welding a set of outer annular steel sheets on the inner side of the third steel sleeve unit close to the tail part;
thirdly, connecting the lower steel cylinders of the first steel sleeve unit, the second steel sleeve unit and the third steel sleeve unit through a flange plate, and arranging annular water-stopping rubber filler strips between every two steel sleeves;
fourthly, connecting the front end of the first steel sleeve unit with an annular transition steel ring through a flange plate, and arranging an annular water-stopping rubber filler strip between the first steel sleeve unit and the annular transition steel ring;
fifthly, welding a closed strip operation hole at the bottom of the lower steel cylinder by using a closed steel bottom plate, filling sand and hoisting the shield machine;
sixthly, covering the upper steel cylinder on the lower steel cylinder, connecting the upper steel cylinder and the lower steel cylinder through a flange plate, and arranging a rubber sheet between the upper steel cylinder and the lower steel cylinder for water stop to form an originating steel cylinder body;
seventhly, welding a set of inner annular steel sheets on the embedded steel bars on the outer side of the specially-made duct piece;
eighthly, mounting a specially-made pipe piece on the negative ring pipe piece far away from the opening end, tamping the negative ring pipe piece by adopting a second sleeper on the bottom surface, and arranging a water-stopping rubber gasket between the negative ring pipe piece and the specially-made pipe piece;
ninth, two rows of round holes of the annular water-stopping rubber sheet are sleeved on the bolt on the outer annular steel sheet and the fixed bolt on the inner annular steel sheet respectively, then the large annular steel sheet and the small annular steel sheet are covered respectively, and the large annular steel sheet and the small annular steel sheet are screwed tightly by adopting fixed nuts to form a flexible connecting mechanism;
tenth step, mounting a reinforcing ring beam and a reaction frame after the specially-made pipe piece, placing a rubber gasket between the specially-made pipe piece and the reinforcing ring beam, and firmly fixing the reaction frame and an originating well beam column or a well bottom plate;
step eleven, arranging a support between the tail part of the third steel sleeve unit and an originating well beam column or a well bottom plate for fixing, and enabling the steel sleeve body to tightly push an annular transition steel ring at a portal; the base is provided with a ground anchor which is anchored with a well bottom plate;
step ten, welding a grouting pipe orifice with a valve and a pressure gauge tee joint at a proper position at the top of the second steel sleeve unit;
and step thirteen, starting the shield machine to start digging and starting through pressure grouting of a grouting pipe opening until the design pressure requirement is met.
The utility model discloses an outstanding beneficial effect lies in:
1. the utility model discloses well flexonics steel sleeve does not receive the propulsive force influence that the shield structure operation produced, does not receive the influence of jack counter-force operation on the reaction frame yet, and the propulsive force that the shield structure operation produced is through the section of jurisdiction directly with the reaction frame support balance. The problems that the existing shield launching system has major defects on a stress system and a steel sleeve is invalid and damaged under the action of counter force are solved.
The original steel sleeve process method is that the counterforce of the propulsive force generated by shield operation is transmitted to a reinforcing ring beam through a duct piece, then one part of the counterforce is transmitted to a jack on a counterforce frame to be balanced, the other part of the counterforce is transmitted to a steel sleeve through the reinforcing ring beam rigidly connected with the steel sleeve, the duct piece is locally contacted with the reinforcing ring beam, the stress path is complex and undefined, the balance of the force is not easy to achieve, two adverse conditions can be caused, firstly, the local stress of the duct piece can be large and cracks can be generated, secondly, the steel sleeve can be pulled to crack at each joint after being subjected to the tensile force, one is the joint between the steel sleeves, the other is the joint between a portal ring plate and the steel sleeve, the phenomena of sealing failure and leakage can be generated, and the engineering construction can be seriously failed.
2 the utility model discloses need not set up the multiunit between beaded finish roof beam and reaction frame and adjust the jack, the construction is simple and convenient, save the cost for the installation construction speed has also simplified the operation. In the original method, jack groups are required to be arranged between the reinforcing ring beam and the reaction frame, so that the negative effect of the propelling force generated by shield operation is expected to be balanced; meanwhile, the jack is expected to apply pre-pressure to the steel sleeve, so that the steel sleeve props against the portal annular plate tightly, the portal annular plate is always in a pressed state, and the tightness is kept. However, the process is complicated, the operation difficulty is increased, the problem of synchronous simultaneous pressure of more than ten jacks exists, and otherwise, the eccentric stress phenomenon occurs; and require strictly accurate mechanical calculations. And the propelling force of the shield tunneling machine in construction is dynamic, and is difficult to match and implement. If the jack is too powerful, the steel sleeve can be damaged due to insufficient rigidity, and the previous work is abandoned. If the force supplied by the jack is insufficient, the two steel sleeves are damaged and cracked under the action of tensile force, or the tightness of the portal annular plate is failed.
3. The utility model discloses in through ingenious flexible coupling mechanism who sets up two annular steel sheets and press from both sides annular stagnant water sheet rubber formation for the space of inside and shield structure casing outside, the burden section of jurisdiction outside at the steel sleeve seals. The elastic deformation of the flexible connecting mechanism offsets the tiny horizontal displacement and torsional deformation generated by the shield segment, so that the flexible connecting mechanism can overcome the influence generated by shield starting in the past steel sleeve process.
4. The utility model discloses in through the height that increases interior annular steel sheet for balanced the most transmission section of jurisdiction of slip casting mud water pressure that comes from the barricade outer infiltration and impress, on a small amount of mud pressure transmits flexible elastic steel sheet, reach the pulling force effect that reduces mud and produce to the steel sleeve.
5. When the pressure of the slurry infiltrated and pressed in from the outside of the retaining wall is high, an independent jack can be arranged at the tail part of the steel sleeve to provide counter force, so that the safety is ensured.
6. The utility model discloses simulated normal tunnel construction environment completely, the steel sleeve is exactly the physical simulation on tunnel stratum. Therefore, when the conditions inside the station well permit, the complete installation of the whole set of system equipment such as the trolley and the like behind the shield machine is facilitated, and the construction is started according to the construction mode in the tunnel.
7. The utility model discloses because steel sleeve atress is less, be difficult to lead to barrel and flange joint component to warp the damage, but reuse rate increases, green.
Drawings
FIG. 1 is a longitudinal sectional view of a flexible connecting steel sleeve mechanism for shield launching according to the present invention;
3 FIG. 3 2 3 is 3 a 3 transverse 3 sectional 3 view 3 of 3 the 3 flexible 3 connecting 3 steel 3 sleeve 3 mechanism 3 A 3- 3 A 3 for 3 shield 3 launching 3 of 3 the 3 present 3 invention 3; 3
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a schematic front end view of the shield originating flexible coupling steel sleeve mechanism of FIG. 1;
FIG. 5 is a schematic view of the flexible connection mechanism of FIG. 1;
fig. 6 is a schematic axial cross-section of the reinforcement ring beam of fig. 1.
In the figure: the device comprises a first steel sleeve unit 101, a second steel sleeve unit 102, a third steel sleeve unit 103, an upper steel sleeve 1, a lower steel sleeve 2, an annular transition steel ring 3, a negative ring pipe piece 4, a specially-made pipe piece 5, a reinforcing ring beam 6, a reaction frame 7, an outer annular steel sheet 8, an inner annular steel sheet 9, an annular water stop rubber sheet 10, a large annular steel sheet 11, a small annular steel sheet 12, an embedded steel bar 13, a diaphragm wall 14, a sleeper 15, a second sleeper 16, a shield machine 17, a starting well beam column 18, a well floor 19, a support 20, a ground anchor 21, a grouting pipe orifice 22, a water stop rubber sheet 23, a fixing nut 24, a base 25, a long operating hole 26, a closed steel floor 27 and an expansion bolt 28.
Detailed Description
The following further description of the present invention:
referring to figures 1-6 of the drawings,
the utility model discloses a flexible connection steel sleeve mechanism for shield starting, which comprises a steel sleeve body for sleeving a shield machine 22, an annular transition steel ring 3, a negative ring duct piece 4, a specially-made duct piece 5, a reinforced ring beam 6 and a reaction frame 7;
the annular transition steel ring 3 is of an annular structure, one end of the annular transition steel ring is connected with the ground connecting wall 14, and the other end of the annular transition steel ring is connected with the front end of the steel sleeve body;
the steel sleeve body is composed of a first steel sleeve unit 101, a second steel sleeve unit 102 and a third steel sleeve unit 103 which are sequentially connected along the axial direction of the steel sleeve body, and a grouting pipe orifice 22 is arranged on the outer wall of the second steel sleeve unit 102; the steel sleeve body is formed by butting and combining an upper steel cylinder 1 and a lower steel cylinder 2 which are semicircular along the circumferential direction of the steel sleeve body, and a base 25 is arranged at the bottom of the lower steel cylinder 2;
the negative ring pipe piece 4 is arranged on the inner side of the tail end of the shield tunneling machine 22, and the negative ring pipe piece 4, the specially-made pipe piece 5, the reinforcing ring beam 6 and the reaction frame 7 are sequentially axially connected;
the specially-made duct piece 5 is of an annular structure, and a flexible connecting mechanism is arranged between the outer wall of the specially-made duct piece and the inner wall of the tail end of the third steel sleeve unit 103.
The flexible connecting mechanism comprises an outer annular steel sheet 8, an inner annular steel sheet 9 and an annular water stop rubber sheet 10, the cross section of the outer annular steel sheet 8 is of an inverted L-shaped structure, and the outer wall of the outer annular steel sheet is connected with the inner wall of the tail end of the third steel sleeve unit 103; the cross section of the inner annular steel sheet 9 is of an L-shaped structure, and the outer wall of the inner annular steel sheet is connected with an embedded steel bar 13 arranged on the outer wall of the specially-made duct piece 5; the annular water stop rubber sheet 10 is arranged between the inner annular steel sheet and the outer annular steel sheet and is used for connecting the inner annular steel sheet and the outer annular steel sheet.
A plurality of fixing bolts are arranged on the outer annular steel sheet 8 and the inner annular steel sheet 9 at equal intervals, two rows of round holes for the fixing bolts to pass through are formed in the annular water stopping rubber sheet 10, and the fixing bolts penetrate through the round holes and are fixedly connected with the large annular steel sheet 11, the small annular steel sheet 12 and the fixing nuts 24 in a matched mode.
The inclined strut of the reaction frame 7 is fixedly connected with an originating well beam column 18 or a well bottom plate 19.
A support 20 is arranged between the originating well beam column 18 or the bottom plate 19 and the third steel sleeve unit 103; and the first, second and third steel sleeve unit supports are provided with ground anchors 21 for anchoring with the well bottom plate 19.
The base 25 is a trapezoidal steel frame, and the top of the base is fixedly connected with the lower steel cylinder 2; a strip operating hole 26 is reserved on the bottom plate of the lower steel cylinder 2, and a closed steel bottom plate 27 matched with the bottom plate is arranged at the top of the bottom plate.
One end of the annular transition steel ring 3 is connected with the underground diaphragm wall 14 through an expansion bolt 28, a water stop rubber sheet 23 is arranged between the annular transition steel ring and the underground diaphragm wall, a sleeper 15 used for supporting is arranged at the bottom of the annular transition steel ring 3, or an annular hole door steel plate matched with the section shape of the annular transition steel ring 3 is pre-embedded in the underground diaphragm wall 14, and one end of the annular transition steel ring 3 is welded with the annular transition steel ring.
The specially-made duct piece 5 is a concrete duct piece with steel bars 13 embedded on the outer side, or a steel duct piece.
The reinforcing ring beam 6 is a steel section beam with square outside and circular inside.
The transition steel ring 3, the first steel sleeve unit 101, the second steel sleeve unit 102 and the third steel sleeve unit 103 are sequentially connected through flange plates, and a water-stopping rubber filler strip is arranged between the transition steel ring 3 and the first steel sleeve unit 101; the upper steel cylinder 1 is connected with the lower steel cylinder 2 through a flange plate.
A construction method of a shield launching flexible connection steel sleeve mechanism comprises the following steps:
firstly, one end of an annular transition steel ring 3 is connected with a diaphragm wall 14 through an expansion bolt 28, a water stopping rubber sheet 23 is arranged between the annular transition steel ring and the diaphragm wall for stopping water, or the annular transition steel ring is welded with an annular portal ring plate, and the bottom of the annular transition steel ring is padded by a sleeper 15;
secondly, welding a set of outer annular steel sheets 8 on the inner side of the third steel sleeve unit 103 close to the tail part;
thirdly, connecting the lower steel cylinders 2 of the first steel sleeve unit 101, the second steel sleeve unit 102 and the third steel sleeve unit 103 through flange plates, and arranging annular water-stopping rubber gasket strips between every two steel sleeve units;
fourthly, the front end of the first steel sleeve unit 101 is connected with an annular transition steel ring 3 through a flange plate, and an annular water-stopping rubber gasket strip is arranged between the first steel sleeve unit and the annular transition steel ring;
fifthly, welding a closed strip operation hole 26 at the bottom of the lower steel cylinder 2 by using a closed steel bottom plate 27, filling sand, and hoisting the shield machine 17;
sixthly, covering the upper steel cylinder 1 on the lower steel cylinder 2, connecting the upper steel cylinder and the lower steel cylinder through a flange plate, and arranging a rubber sheet between the upper steel cylinder and the lower steel cylinder for stopping water to form an originating steel cylinder body;
seventhly, welding a set of inner annular steel sheets 9 on the embedded steel bars 13 on the outer side of the specially-made duct piece 5;
eighthly, mounting a specially-made duct piece 5 on the negative ring duct piece 4 far away from the opening end, tamping the negative ring duct piece 4 on the bottom surface by adopting a second sleeper 16, and arranging a water-stopping rubber gasket between the negative ring duct piece 4 and the specially-made duct piece 5;
ninth, two rows of round holes of the annular water-stopping rubber sheet 10 are respectively sleeved on bolts on the outer annular steel sheet 8 and fixed bolts on the inner annular steel sheet 9, then the large annular steel sheet 11 and the small annular steel sheet 12 are respectively covered, and the large annular steel sheet and the small annular steel sheet are screwed tightly by adopting fixed nuts 24 to form a flexible connecting mechanism;
tenth step, installing a reinforcing ring beam 6 and a reaction frame 7 behind the specially-made pipe piece 5, placing a rubber gasket between the specially-made pipe piece 5 and the reinforcing ring beam 7, and firmly fixing the reaction frame 7 with an originating well beam column 18 or a well bottom plate 19;
step eleven, arranging a support 20 between the tail part of the third steel sleeve unit 103 and the starting well beam column 18 or the bottom plate 19 for fixing, and enabling the steel sleeve body to tightly push the annular transition steel ring 3 at the portal; the base 25 is provided with a ground anchor 21 which is anchored with the bottom plate 19;
step ten, welding a grouting pipe orifice 22 with a valve and a pressure gauge tee joint at a proper position at the top of the second steel sleeve unit 102;
and step thirteen, performing pressure grouting through a grouting pipe orifice 22 until the design pressure requirement, and starting the shield tunneling machine to perform excavation starting.
The above mentioned is only the embodiment of the present invention, not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings or the direct or indirect application in the related technical field are included in the patent protection scope of the present invention.
Claims (9)
1. The utility model provides a shield constructs flexible coupling steel sleeve mechanism that starts which characterized in that: the shield tunneling machine comprises a steel sleeve body for sleeving a shield tunneling machine (17), an annular transition steel ring (3), a negative ring duct piece (4), a specially-made duct piece (5), a reinforcing ring beam (6) with an outer square and an inner circular shape and a reaction frame (7); the annular transition steel ring (3) is of an annular structure, one end of the annular transition steel ring is connected with the ground connecting wall (14), and the other end of the annular transition steel ring is connected with the front end of the steel sleeve body; the steel sleeve body is composed of a first steel sleeve unit (101), a second steel sleeve unit (102) and a third steel sleeve unit (103) which are sequentially connected along the axial direction of the steel sleeve body, and a grouting pipe orifice (22) is arranged on the outer wall of the second steel sleeve unit (102); the steel sleeve body is formed by butting and combining an upper steel cylinder (1) and a lower steel cylinder (2) which are semicircular along the circumferential direction of the steel sleeve body, and a base (25) is arranged at the bottom of the lower steel cylinder (2); the negative ring duct piece (4) is arranged on the inner side of the tail end of the shield tunneling machine (17), and the negative ring duct piece (4), the specially-made duct piece (5), the reinforcing ring beam (6) and the reaction frame (7) are sequentially connected; the special segment (5) is of an annular structure, and a flexible connecting mechanism is arranged between the outer wall of the special segment and the inner wall of the tail end of the third steel sleeve unit (103).
2. The shield starting flexible connection steel sleeve mechanism according to claim 1, characterized in that: the flexible connecting mechanism comprises an outer annular steel sheet (8), an inner annular steel sheet (9) and an annular water stop rubber sheet (10), the cross section of the outer annular steel sheet (8) is of an inverted L-shaped structure, and the outer wall of the outer annular steel sheet is connected with the inner wall of the tail end of the third steel sleeve unit (103); the cross section of the inner annular steel sheet (9) is of an L-shaped structure, the outer wall of the inner annular steel sheet is connected with an embedded steel bar (13) arranged on the outer wall of the specially-made duct piece (5), and the embedded steel bar (13) is a concrete duct piece or a steel duct piece; the annular water stop rubber sheet (10) is arranged between the inner annular steel sheet and the outer annular steel sheet and is used for connecting the inner annular steel sheet and the outer annular steel sheet.
3. The shield starting flexible connection steel sleeve mechanism according to claim 2, characterized in that: outer annular steel sheet (8) and interior annular steel sheet (9) are equidistant to be equipped with a plurality of fixing bolt, be equipped with on annular stagnant water rubber sheet (10) and be used for two rows of round holes that fixing bolt passed, fixing bolt passes behind the round hole, with big annular steel sheet (11), little annular steel sheet (12) and fixation nut (24) cooperation fixed connection.
4. The shield starting flexible connection steel sleeve mechanism according to claim 1, characterized in that: and the inclined strut of the reaction frame (7) is fixedly connected with an originating well beam column (18) or a well bottom plate (19).
5. The shield starting flexible connection steel sleeve mechanism according to claim 4, wherein: a support (20) is arranged between the originating well beam column (18) or the bottom plate (19) and the third steel sleeve unit (103); and the first, second and third steel sleeve unit supports are provided with ground anchors (21) for anchoring with the well bottom plate (19).
6. The shield starting flexible connection steel sleeve mechanism according to claim 1, characterized in that: the base (25) is a trapezoidal steel frame, and the top of the base is fixedly connected with the lower steel cylinder (2); a strip operating hole (26) is reserved on the bottom plate of the lower steel cylinder (2), and a closed steel bottom plate (27) matched with the bottom plate is arranged at the top of the lower steel cylinder.
7. The shield starting flexible connection steel sleeve mechanism according to claim 1, characterized in that: one end of the annular transition steel ring (3) is connected with the underground diaphragm wall (14) through an expansion bolt (28), a water stop rubber sheet (23) is arranged between the annular transition steel ring and the underground diaphragm wall, and a sleeper (15) used for supporting is arranged at the bottom of the annular transition steel ring (3).
8. The shield starting flexible connection steel sleeve mechanism according to claim 7, wherein: an annular tunnel portal steel plate matched with the section shape of the annular transition steel ring (3) is pre-embedded in the ground connecting wall (14), and one end of the annular transition steel ring (3) is welded with the annular tunnel portal steel plate.
9. The shield starting flexible connection steel sleeve mechanism according to claim 1, characterized in that: the transition steel ring (3), the first steel sleeve unit (101), the second steel sleeve unit (102) and the third steel sleeve unit (103) are sequentially connected through a flange plate, and a water-stopping rubber gasket strip is arranged between the transition steel ring and the second steel sleeve unit; the upper steel cylinder (1) is connected with the lower steel cylinder (2) through a flange plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021389570.1U CN212225220U (en) | 2020-07-15 | 2020-07-15 | Shield constructs flexible connection steel sleeve mechanism that starts |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021389570.1U CN212225220U (en) | 2020-07-15 | 2020-07-15 | Shield constructs flexible connection steel sleeve mechanism that starts |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734427A (en) * | 2020-07-15 | 2020-10-02 | 南昌大学 | Flexible connection steel sleeve mechanism for shield starting and construction method thereof |
| CN111734427B (en) * | 2020-07-15 | 2024-07-30 | 南昌大学 | Shield originating flexible connection steel sleeve mechanism and construction method thereof |
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2020
- 2020-07-15 CN CN202021389570.1U patent/CN212225220U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734427A (en) * | 2020-07-15 | 2020-10-02 | 南昌大学 | Flexible connection steel sleeve mechanism for shield starting and construction method thereof |
| CN111734427B (en) * | 2020-07-15 | 2024-07-30 | 南昌大学 | Shield originating flexible connection steel sleeve mechanism and construction method thereof |
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