Method for quickly installing lower semicircle of shield receiving steel sleeve

Abstract

The invention discloses a method for quickly installing a lower semicircle of a steel sleeve for shield receiving, and relates to the technical field of shield receiving, the method for quickly installing the lower semicircle of the steel sleeve for shield receiving comprises the following steps: respectively hoisting a plurality of single blocks to form a plurality of lower semicircle sections of the steel sleeve; the flange surface of the lower semicircular section of each steel sleeve is embedded into the chloroprene rubber pad and is connected through a bolt; a transition ring is installed, a lower semicircular groove of the transition ring is formed in the inner side, the position, with the distance D from the tunnel portal embedded steel ring, of the transition ring is filled with a steel plate, full welding is conducted, and the bottom of the steel sleeve is formed; wherein D is greater than 3mm; c20 fine aggregate concrete is poured within the 60-degree range of the bottom of the steel sleeve to form a base, the base is connected with a tunnel portal reinforcing soil body, and a lower semicircle of the steel sleeve for shield receiving is formed. According to the method, the modes of block hoisting and bolt connection are adopted, so that the construction period is greatly shortened, the mounting efficiency is improved, and more reliable guarantee is provided for shield receiving work.

Description

Technical Field

[0001] The invention relates to the technical field of shield receiving technology, in particular to a method for quickly installing a lower semicircle of a steel sleeve for shield receiving. Background Art

[0002] With the rapid development of urban rail transit construction, shield construction technology has been widely used in subway tunnel projects. The reception of the shield machine is a critical step in the entire shield construction process, and the installation quality of the lower half of the steel sleeve directly affects the success of the reception. Traditional methods of fixing the lower half of the steel sleeve are time-consuming and slow construction progress. Summary of the Invention

[0003] The main purpose of the invention is to provide a method for quickly installing the lower semicircle of a steel sleeve for receiving a shield, aiming to improve the installation efficiency of the lower semicircle of the steel sleeve.

[0004] To achieve the above-mentioned object, the present invention proposes a method for quickly installing the lower semicircle of a steel sleeve for receiving a shield machine, wherein the lower semicircle of the steel sleeve comprises a plurality of single blocks, and the method for quickly installing the lower semicircle of a steel sleeve for receiving a shield machine comprises:

[0005] hoisting a plurality of the single blocks respectively to form a plurality of lower semicircular segments of the steel sleeve;

[0006] The flange surface of the lower semicircular segment of each steel sleeve is embedded with a neoprene pad and connected with bolts;

[0007] Install the transition ring, with the lower semicircular groove of the transition ring opened on the inside, fill the steel plate at a distance D from the pre-buried steel ring of the tunnel portal, and fully weld it to form the bottom of the steel sleeve; where D>3mm;

[0008] C20 fine stone concrete is poured within a 60° range at the bottom of the steel sleeve to form a base, and the base is connected to the reinforced soil of the tunnel portal to form the lower semicircle of the shield receiving steel sleeve.

[0009] In one embodiment, after the step of hoisting a plurality of the monoblocks to form a plurality of steel sleeve lower semicircular segments, the method for quickly installing the shield receiving steel sleeve lower semicircular further comprises:

[0010] Welding 4 lifting lugs on the lower semicircular segment of each steel sleeve;

[0011] The position of each lower semicircular segment of the steel sleeve is adjusted using the lifting lug to verify the center offset of the lower semicircular segment of the shield receiving steel sleeve.

[0012] In one embodiment, the flange surface of each lower semicircular segment of the steel sleeve is embedded with a neoprene pad, and the steps of bolting the flange surface and the lower semicircular segment of the steel sleeve include:

[0013] Coating silicone grease lubricant on the surface of the neoprene rubber pad, and embedding the neoprene rubber pad into the flange surface of the lower semicircular segment of each steel sleeve;

[0014] Tighten the flange of each lower semicircular section of the steel sleeve with the bolts three times, with the first torque being 50% of the design value and the final torque being 120%;

[0015] A feeler gauge is used to check the circumferential clearance of the flange, and a stainless steel gasket is used to adjust the circumferential clearance.

[0016] In one embodiment, the lower semicircular groove of the transition ring has a groove angle of 30°, a blunt edge of 2 mm, and a gap of 3 to 4 mm.

[0017] In one embodiment, the steps of pouring C20 fine stone concrete within a 60° range at the bottom of the steel sleeve to form a base, connecting the base with the portal reinforcement soil, and forming the lower semicircle of the shield receiving steel sleeve include:

[0018] A steel template is assembled within a 60° range at the bottom of the steel sleeve, and a release agent is applied to the inner wall of the template to form the template of the base;

[0019] C20 fine stone concrete is poured into the template of the base to form the base, and the base is connected to the reinforced soil of the portal to form the lower semicircle of the shield receiving steel sleeve.

[0020] In one embodiment, after the step of hoisting a plurality of the monoblocks to form a plurality of steel sleeve lower semicircular segments, the method for quickly installing the shield receiving steel sleeve lower semicircular further comprises:

[0021] Temporary steel supports are provided on both sides of the lower semicircular segments of the plurality of steel sleeves, and steel plates are welded to the ends of the temporary steel supports to press against the side walls of the foundation pit;

[0022] Dynamically adjust the temporary support of the steel section.

[0023] In one embodiment, the step of dynamically adjusting the temporary support of the steel section includes:

[0024] After each completion of the construction of the lower semicircular section of the steel sleeve, the displacement of the temporary support of the steel section is detected;

[0025] According to the displacement, it is determined whether additional diagonal braces are needed.

[0026] In one embodiment, the step of determining whether additional diagonal bracing is required based on the displacement includes:

[0027] When the displacement is greater than or equal to 1 mm, the diagonal brace needs to be added.

[0028] In one embodiment, after the steps of pouring C20 fine stone concrete within a 60° range of the bottom of the steel sleeve to form a base, connecting the base with the portal reinforced soil, and forming the lower semicircle of the shield receiving steel sleeve, the method for quickly installing the lower semicircle of the shield receiving steel sleeve further comprises:

[0029] After the lower semicircle of the shield receiving steel sleeve is completely installed and the upper structure is welded, the temporary support of the steel section is removed.

[0030] In one embodiment, the flange surface of each lower semicircular segment of the steel sleeve is provided with a plurality of conical locating pins, and the flange surfaces of two adjacent lower semicircular segments of the steel sleeve are provided with guide grooves for plugging with the locating pins at positions corresponding to the locating pins.

[0031] The technical solution of this invention significantly shortens the construction period and improves installation efficiency by adopting a block-by-block lifting and bolt connection method. Secondly, the use of neoprene pads and transition rings ensures the sealing and stability of the connection. Finally, the base casting method enhances the load-bearing capacity and service life of the overall structure. These steps collectively solve the technical problems of long construction periods and unstable connections in the traditional installation process of the lower semicircular steel sleeve, providing more reliable protection for shield reception work. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0033] Figure 1 This is a structural schematic diagram of an embodiment of a method for quickly installing the lower semicircle of a shield receiving steel sleeve provided by the present invention.

[0034] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] With the rapid development of urban rail transit construction, shield construction technology has been widely used in subway tunnel projects. The reception of the shield machine is a critical step in the entire shield construction process, and the installation quality of the lower half of the steel sleeve directly affects the success of the reception. Traditional methods of fixing the lower half of the steel sleeve are time-consuming and slow construction progress.

[0039] In order to solve this technical problem, the present invention proposes a method for quickly installing the lower semicircle of a shield receiving steel sleeve.

[0040] See also Figure 1 In one embodiment of the present invention, the lower semicircle of the steel sleeve includes a plurality of single blocks, and the method for quickly installing the lower semicircle of the steel sleeve for receiving the shield includes:

[0041] Step S10, hoisting a plurality of the single blocks respectively to form a plurality of lower semicircular segments of the steel sleeve;

[0042] Step S20, embedding a neoprene pad into the flange surface of each lower semicircular segment of the steel sleeve and connecting them with bolts;

[0043] Step S30: Install a transition ring with the lower semicircular groove of the transition ring opened on the inner side, fill the steel plate at a distance D from the pre-buried steel ring of the tunnel portal, and fully weld it to form the bottom of the steel sleeve; wherein D>3mm;

[0044] Step S40, pouring C20 fine stone concrete within 60 degrees of the bottom of the steel sleeve to form a base, so that the base is connected to the portal reinforcement soil to form the lower semicircle of the shield receiving steel sleeve.

[0045] It should be noted that the shield reception in this application refers to the reception of the head of the shield machine.

[0046] Specifically, (1) Hoisting and positioning: Use a 130t truck crane to lift the lower semicircle of the steel sleeve in blocks, with the maximum weight of a single block ≤30t and the hoisting radius ≤14m. Use a laser rangefinder to calibrate the deviation between the center line of the steel sleeve and the axis of the portal to ≤2mm;

[0047] (2) Segmented connection: The lower semicircular flange surface of each steel sleeve is embedded with an 8mm thick neoprene pad and connected with M30 8.8 grade bolts. The bolt preload is ≥200kN and the flange gap is ≤0.5mm.

[0048] (3) Transition ring welding: The lower semicircular groove of the transition ring is opened on the inside, and the gap between the transition ring and the embedded steel ring of the tunnel door is greater than 3mm and filled with 16mm thick steel plate. After full welding, it is qualified by magnetic particle inspection;

[0049] (4) Casting of bottom base: Cast a C20 fine stone concrete base with a thickness of 150 mm within 60° of the bottom of the steel sleeve. The base is connected to the reinforced soil of the portal, and the surface flatness is ≤ 3 mm / m;

[0050] (5) Dynamic monitoring: During the installation process, the displacement of the steel sleeve is monitored in real time, ≤1.5mm, and the strain value is ≤300με.

[0051] More specifically, post-installation leveling:

[0052] (a) Leveling benchmark: Taking the center of the pre-embedded steel ring of the portal as the benchmark, measure the elevation difference of 12 points around the entire circumference to be ≤2mm;

[0053] (b) Leveling tool: Use a hydraulic jack (lifting force ≥ 200kN) to lift the steel sleeve, and insert a stainless steel wedge-shaped gasket (thickness 1-5mm) at the bottom;

[0054] (c) Acceptance criteria: Steel sleeve horizontality ≤1‰, radial roundness deviation ≤3mm.

[0055] Through high-precision leveling, the shield machine propulsion axis deviation is ensured to be ≤10mm, and the reception success rate is high.

[0056] As an exemplary embodiment:

[0057] During the construction of a shield tunnel, a 130t truck crane was used to lift the lower half of the steel sleeve in sections, with each section taking 20 minutes or less. M30 bolts (preload force 220kN) were used for flange connections, with a rubber pad compression rate of 35% and an axial deviation of 1.2mm after installation. The transition ring welds passed flaw detection, and the bottom base had a compressive strength of 26MPa.

[0058] The CO2 welding parameters were set at 300A and 30V, and the weld was flawless. Two Φ219 braces were added as temporary supports, resulting in a 0.5mm lateral displacement. The watertightness test pressure dropped to 0.03 bar, confirming the seal met the standard.

[0059] The combination of locating pins and guide grooves reduces flange docking time to 4 minutes per section. A hydraulic wrench tightens bolts according to the planned path, achieving 97% uniformity in preload force. After leveling, the steel sleeve's horizontality is 0.8‰, and the shield receiving axis deviation is 8mm. This increases installation efficiency for the lower half of the steel sleeve by 50%, with a single-section installation time of ≤25 minutes. The flange connection seal meets standards, reducing the risk of leakage to less than 0.5%. The shield receiving axis accuracy is ±10mm, and segment misalignment is ≤2mm.

[0060] The technical solution provided by this invention significantly shortens the construction period and improves installation efficiency by adopting a block-by-block lifting and bolt connection method. Secondly, the use of neoprene pads and transition rings ensures the sealing and stability of the connection. Finally, the base casting method enhances the load-bearing capacity and service life of the overall structure. These steps collectively address the technical issues of long construction periods and unstable connections in the traditional installation of the lower semicircular steel sleeve, providing a more reliable guarantee for shield reception work.

[0061] In addition, the quick installation method for the lower semicircle of the shield receiving steel sleeve also includes a sealing pre-inspection:

[0062] (a) Watertight test: Pour water into the lower semicircle of the steel sleeve to a height of 1m, let it stand for 1 hour, and the leakage rate shall be ≤0.1L / min;

[0063] (b) Air pressure test: pressurize to 0.5 bar, maintain pressure for 30 minutes, and the pressure drop is ≤ 0.05 bar;

[0064] (c) Defect treatment: The leakage point is sealed with epoxy resin glue (100 parts epoxy resin and 30 parts curing agent), and the re-inspection is qualified after curing.

[0065] Through double sealing detection, the risk of leakage during the installation phase is reduced to less than 1%.

[0066] In an embodiment of the present invention, after the step of hoisting a plurality of the single blocks to form a plurality of steel sleeve lower semicircular segments, the method for quickly installing the shield receiving steel sleeve lower semicircular further comprises:

[0067] Step S201, welding four lifting lugs on the lower semicircular segment of each steel sleeve;

[0068] Step S202: Use the lifting lugs to adjust the position of each lower semicircular segment of the steel sleeve to verify the center offset of the lower semicircular segment of the shield receiving steel sleeve.

[0069] Specifically, (a) Lifting lug setting: 4 lifting lugs are welded on the lower semicircle of each steel sleeve. The lifting lug material is Q345B steel plate (30 mm thick). The weld height is ≥15 mm and has passed ultrasonic testing.

[0070] (b) Center of gravity calibration: Use a total station to measure the center of gravity offset of the steel sleeve to be ≤50mm, and the angle between the lifting wire rope and the vertical direction to be ≤5°;

[0071] (c) Temporary fixation: After hoisting into place, use an adjustable jack (lifting force ≥ 100kN) for temporary support and adjust the levelness to ≤ 1‰.

[0072] By optimizing the lifting lug strength and calibrating the center of gravity, hoisting deformation is avoided and the installation time is shortened by 30%.

[0073] In an embodiment of the present invention, the steps of embedding a chloroprene rubber pad in the flange surface of each lower semicircular segment of the steel sleeve and connecting with bolts include:

[0074] Step S21, coating the surface of the neoprene rubber pad with silicone grease lubricant, and embedding the neoprene rubber pad into the flange surface of the lower semicircular segment of each steel sleeve;

[0075] Step S22, tightening the flange of each lower semicircular segment of the steel sleeve with the bolts three times, with the first torque being 50% of the design value and the final torque being 120%;

[0076] Step S23: Use a feeler gauge to check the circumferential clearance of the flange, and use a stainless steel gasket to adjust the circumferential clearance.

[0077] Specifically, (a) rubber pad pretreatment: the rubber pad surface is coated with silicone grease lubricant (mass ratio: silicone grease 100 parts, molybdenum disulfide 10 parts), with a compression rate of ≥30%;

[0078] (b) Bolt tightening sequence: Tighten in three steps according to the principle of "diagonal symmetry", with the first torque being 50% of the design value and the final torque being 120%;

[0079] (c) Clearance detection: Use a feeler gauge to check the circumferential clearance of the flange. If the local clearance exceeds the tolerance, install a 0.1mm stainless steel shim to adjust it.

[0080] Through lubricant and step-by-step tightening process, the bolt connection sealing rate reaches 100% and the flange misalignment is ≤0.2mm.

[0081] In an embodiment of the present invention, the lower semicircular groove of the transition ring has a groove angle of 30°, a blunt edge of 2 mm, and a gap of 3 to 4 mm.

[0082] Specifically, the transition ring welding step includes:

[0083] (a) Groove type: The lower semicircular groove angle of the transition ring is 30°, the blunt edge is 2mm, and the gap is 3-4mm;

[0084] (b) Welding process: CO2 gas shielded welding (current 280-320A, voltage 28-32V), interpass temperature ≤ 150°C, weld reinforcement ≤ 3mm;

[0085] (c) Inspection standards: The welds are free of cracks after magnetic particle inspection and are qualified after ultrasonic inspection level II.

[0086] Through optimization of welding parameters, the tensile strength of the weld is ≥400MPa and the hardness of the heat-affected zone is ≤250HV.

[0087] In an embodiment of the present invention, the steps of pouring C20 fine stone concrete within a 60° range at the bottom of the steel sleeve to form a base, connecting the base with the portal reinforcement soil, and forming the lower semicircle of the shield receiving steel sleeve include:

[0088] Step S41, assembling a steel template within a 60° range of the bottom of the steel sleeve, and applying a release agent on the inner wall of the template to form the template of the base;

[0089] Step S42: pouring C20 fine stone concrete onto the formwork of the base to form the base, so that the base is connected to the portal reinforcement soil to form the lower semicircle of the shield receiving steel sleeve.

[0090] Specifically, the bottom base pouring step includes:

[0091] (a) Base formwork: Steel formwork (10 mm thick) is used for assembly, and the inner wall of the formwork is coated with a release agent (mass ratio: 100 parts of engine oil and 20 parts of talcum powder);

[0092] (b) Concrete mix ratio: 100 parts cement (PO 42.5), 180 parts sand (fineness modulus 2.6), 250 parts crushed stone (5-10 mm), and 40 parts water;

[0093] (c) Vibration compaction: Use an inserted vibrator (frequency ≥ 12,000 times / min) to vibrate in layers, with each layer thickness ≤ 300 mm and a density ≥ 95%.

[0094] Through ratio optimization and vibration control, the compressive strength of the base is ≥25MPa and there is no honeycomb surface.

[0095] In an embodiment of the present invention, after the step of hoisting a plurality of the single blocks to form a plurality of steel sleeve lower semicircular segments, the method for quickly installing the shield receiving steel sleeve lower semicircular further comprises:

[0096] Step S101: Temporary steel supports are provided on both sides of the lower semicircular segments of the plurality of steel sleeves, and steel plates are welded to the ends of the temporary steel supports to press against the side walls of the foundation pit;

[0097] Step S102: Dynamically adjust the temporary support of the steel section.

[0098] In an embodiment of the present invention, the step of dynamically adjusting the temporary support of the steel section includes:

[0099] Step S121, after each completion of the construction of the lower semicircular section of the steel sleeve, detecting the displacement of the temporary support of the steel section;

[0100] Step S122: judging whether additional diagonal braces are needed based on the displacement.

[0101] In an embodiment of the present invention, the step of determining whether additional diagonal bracing is required based on the displacement includes:

[0102] Step S123: When the displacement is greater than or equal to 1 mm, the diagonal brace needs to be added.

[0103] In an embodiment of the present invention, after the steps of pouring C20 fine stone concrete within a 60° range of the bottom of the steel sleeve to form a base, connecting the base with the portal reinforced soil, and forming the lower semicircle of the shield receiving steel sleeve, the method for quickly installing the lower semicircle of the shield receiving steel sleeve further comprises:

[0104] Step S50: After the lower semicircle of the shield receiving steel sleeve is completely installed and the upper structure is welded, the temporary support of the steel section is removed.

[0105] Specifically, (a) support arrangement: temporary I20b steel supports (spacing 1600 mm) are set on both sides of the lower semicircle of the steel sleeve, and 20 mm thick steel plates are welded to the ends of the supports to press against the side walls of the foundation pit;

[0106] (b) Dynamic adjustment: During the installation process, when each section of steel sleeve is completed and the support displacement is detected to be ≥1mm, an additional diagonal brace (Φ219×10mm, angle 45°) is added;

[0107] (c) Removal conditions: The temporary support can be removed only after the overall installation of the steel sleeve is completed and the superstructure is welded.

[0108] The temporary support system suppresses installation deformation, with lateral displacement ≤0.8mm and structural stability improved by 50%.

[0109] In an embodiment of the present invention, the flange surface of each section of the lower semicircular segment of the steel sleeve is provided with a plurality of conical locating pins, and the flange surfaces of the two adjacent sections of the lower semicircular segment of the steel sleeve are provided with guide grooves for plugging with the locating pins at positions corresponding to the locating pins.

[0110] Specifically, (a) positioning pin setting: four Φ30mm tapered positioning pins (material 40Cr, hardness HRC40-45) are set on the flange surface of each steel sleeve;

[0111] (b) Guide groove matching: guide grooves (32mm wide and 10mm deep) are provided on the adjacent flange surfaces, with a clearance of ≤0.5mm between the guide grooves and the positioning pins;

[0112] (c) Rapid alignment: The positioning pins are automatically guided into the guide groove during lifting, and the alignment time is ≤5 minutes / section.

[0113] By coordinating the positioning pins and guide grooves, the flange docking efficiency is increased by 60% and the manual adjustment amount is reduced by 80%.

[0114] In addition, automated bolt tightening:

[0115] (a) Hydraulic wrench selection: output torque ≥ 3000 N·m, accuracy ±3%, equipped with M30 socket;

[0116] (b) Tightening path planning: Tighten in three steps along a “cross-symmetrical” path, with torque increments of 50%, 80%, and 120% each time;

[0117] (c) Data recording: Real-time recording of torque values ​​and generation of reports; marking and re-tightening of bolts that exceed tolerance.

[0118] Through automated tightening and data traceability, the uniformity of bolt preload force is increased to over 95%.

[0119] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. A method for quickly installing the lower semicircle of a shield receiving steel sleeve, characterized in that: The lower semicircle of the steel sleeve includes a plurality of single blocks, and the method for quickly installing the lower semicircle of the shield receiving steel sleeve includes: hoisting a plurality of the single blocks respectively to form a plurality of lower semicircular segments of the steel sleeve; The flange surface of the lower semicircular segment of each steel sleeve is embedded with a neoprene pad and connected with bolts; Install the transition ring, with the lower semicircular groove of the transition ring opened on the inside, fill the steel plate at a distance D from the pre-buried steel ring of the tunnel portal, and fully weld it to form the bottom of the steel sleeve; where D>3mm; C20 fine stone concrete is poured within a 60° range at the bottom of the steel sleeve to form a base, and the base is connected to the reinforced soil of the tunnel portal to form the lower semicircle of the shield receiving steel sleeve.

2. The method for quickly installing the lower semicircle of the shield receiving steel sleeve according to claim 1, characterized in that: After the steps of hoisting a plurality of the single blocks to form a plurality of steel sleeve lower semicircular segments, the method for quickly installing the shield receiving steel sleeve lower semicircular segment further comprises: Welding 4 lifting lugs on the lower semicircular segment of each steel sleeve; The position of each lower semicircular segment of the steel sleeve is adjusted using the lifting lug to verify the center offset of the lower semicircular segment of the shield receiving steel sleeve.

3. The method for quickly installing the lower semicircle of the shield receiving steel sleeve according to claim 2, characterized in that: The steps of embedding a neoprene pad into the flange surface of the lower semicircular segment of each steel sleeve and connecting the flange surface with bolts include: Coating silicone grease lubricant on the surface of the neoprene rubber pad, and embedding the neoprene rubber pad into the flange surface of the lower semicircular segment of each steel sleeve; Tighten the flange of each lower semicircular section of the steel sleeve with the bolts three times, with the first torque being 50% of the design value and the final torque being 120%; A feeler gauge is used to check the circumferential clearance of the flange, and a stainless steel gasket is used to adjust the circumferential clearance.

4. The method for quickly installing the lower semicircle of the shield receiving steel sleeve according to claim 1, characterized in that: The lower semicircular groove of the transition ring has a groove angle of 30°, a blunt edge of 2 mm, and a gap of 3 to 4 mm.

5. The method for quickly installing the lower semicircle of the shield receiving steel sleeve according to claim 1, characterized in that: The steps of pouring C20 fine stone concrete within 60° of the bottom of the steel sleeve to form a base, connecting the base with the portal reinforcement soil, and forming the lower semicircle of the shield receiving steel sleeve include: A steel template is assembled within a 60° range at the bottom of the steel sleeve, and a release agent is applied to the inner wall of the template to form the template of the base; C20 fine stone concrete is poured into the template of the base to form the base, and the base is connected to the reinforced soil of the portal to form the lower semicircle of the shield receiving steel sleeve.

6. The method for quickly installing the lower semicircle of a shield receiving steel sleeve according to any one of claims 1 to 5, characterized in that: After the steps of hoisting a plurality of the single blocks to form a plurality of steel sleeve lower semicircular segments, the method for quickly installing the shield receiving steel sleeve lower semicircular segment further comprises: Temporary steel supports are provided on both sides of the lower semicircular segments of the plurality of steel sleeves, and steel plates are welded to the ends of the temporary steel supports to press against the side walls of the foundation pit; Dynamically adjust the temporary support of the steel section.

7. The method for quickly installing the lower semicircle of the shield receiving steel sleeve according to claim 6, characterized in that: The steps of dynamically adjusting the temporary support of the steel section include: After each completion of the construction of the lower semicircular section of the steel sleeve, the displacement of the temporary support of the steel section is detected; According to the displacement, it is determined whether additional diagonal braces are needed.

8. The method for quickly installing the lower semicircle of the shield receiving steel sleeve according to claim 7, characterized in that: The step of determining whether additional diagonal bracing is required based on the displacement includes: When the displacement is greater than or equal to 1 mm, the diagonal brace needs to be added.

9. The method for quickly installing the lower semicircle of the shield receiving steel sleeve according to claim 6, characterized in that: After the steps of pouring C20 fine stone concrete within a 60° range of the bottom of the steel sleeve to form a base, connecting the base with the portal reinforced soil, and forming the lower semicircle of the shield receiving steel sleeve, the method for quickly installing the lower semicircle of the shield receiving steel sleeve further comprises: After the lower semicircle of the shield receiving steel sleeve is completely installed and the upper structure is welded, the temporary support of the steel section is removed.

10. The method for quickly installing the lower semicircle of a shield receiving steel sleeve according to any one of claims 1 to 5, characterized in that: The flange surface of each lower semicircular segment of the steel sleeve is provided with a plurality of tapered locating pins, and the flange surfaces of two adjacent lower semicircular segments of the steel sleeve are provided with guide grooves for plugging with the locating pins at positions corresponding to the locating pins.

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