CN-121993212-A - Waterproof construction method for air pushing of submarine tunnel shield machine

CN121993212ACN 121993212 ACN121993212 ACN 121993212ACN-121993212-A

Abstract

The invention relates to the technical field of submarine shield waterproof construction, in particular to a waterproof construction method for the blank-pushing of a submarine tunnel shield machine, which comprises the steps of measuring and trimming a mine section primary support and a blank-pushing starting room, constructing a multilayer slurry-stopping protection system, constructing a guide table, rechecking precision, calculating and implementing cutter disc front stacking to provide equivalent reverse thrust, laying mortar backfill pipelines and preparing high-performance mortar, stopping pushing when the shield machine is driven to a preset condition, adopting a wedge-shaped ring segment to install and fasten a longitudinal ring connecting structure according to a preset sequence, and compactly filling a gap between the segment and the primary support inner contour in a combined mode of synchronous grouting, directional pressure filling high-performance mortar and secondary slurry filling.

Inventors

LIU TAO
PENG HUADONG
Hao Binfei
CHENG YUHAO
Ling tianyang
Luo Ruisi
WANG ZHAOYAN
LIU HONGJUN
SUN HAO

Assignees

中国海洋大学
中铁十局集团有限公司
中铁十局集团第一工程有限公司
广州市白云区建设工程管理中心

Dates

Publication Date: 20260508
Application Date: 20260115

Claims (10)

1. The waterproof construction method for the air pushing of the submarine tunnel shield machine is characterized by comprising the following steps of: S1, measuring and trimming primary supports of mine sections and an empty pushing starting room, constructing a multilayer slurry stopping protection system, constructing a guide table, rechecking accuracy, calculating and implementing cutter head front stacking to provide equivalent reverse thrust, laying a mortar backfill pipeline and preparing high-performance mortar; S2, controlling the shield machine to advance at a preset speed, monitoring the state of the shield tail falling out of the duct piece and the shield posture in the advancing process, and synchronously carrying out grouting operation; S3, stopping pushing when the shield machine is driven to a preset condition, installing and fastening the longitudinal annular connecting structure by adopting wedge-shaped ring segments according to a preset sequence, and protecting the waterproof sealing component; s4, tightly filling a gap between the duct piece and the inner outline of the primary support in a combined mode of synchronous grouting, directional pressure filling high-performance mortar and secondary grouting; s5, adopting a combined measure of temporary supporting and ring longitudinal tie fixation, and limiting the displacement and deformation of the segment after the segment is separated from the shield tail by matching with the early strength characteristic of the filling material; s6, monitoring the state of the pipe piece, grouting parameters, the shield posture and structural stress in real time, and dynamically optimizing construction parameters according to monitoring results.
2. The method for constructing a waterproof construction method for air thrust of a submarine tunnel shield machine according to claim 1, wherein the constructing a multilayer grout-stopping protection system comprises: S11, arranging a plurality of slurry blocking structures based on the periphery of a shield shell, specifically, arranging a combined structure of an air bag and an elastic steel plate at the position, close to a cutter head, of a front shield to serve as a first slurry blocking layer, and respectively welding the elastic steel plate at the middle part and the tail of the front shield to serve as a second slurry blocking layer and a third slurry blocking layer; S12, calculating layout intervals along the arch wall range of the primary support inner contour, taking the primary support inner contour super-undermining control threshold value, the mortar diffusion radius in the shield machine advancing process and the stress stability of a mortar blocking structure as core parameters, and combining the penetration characteristics and the solidification time of the slurry in the gap; s13, preassembling annular elastic steel plate bundles according to arrangement intervals, fixing the steel plate bundles on the primary supporting surface through expansion bolts, filling contact gaps between the steel plate bundles and the primary supporting surface with epoxy mortar, and sealing the steel plate bundle splicing seams by full welding to form an annular slurry blocking barrier.
3. The waterproof construction method for the air pushing of the submarine tunnel shield machine according to claim 2, wherein the combined structure of the air bag and the elastic steel plate comprises the steps that an air bag groove is formed in the circumferential direction of a shield shell at the position 600-800 mm away from the edge of a cutter disc on the front shield, the customized air bag is embedded into the groove and is adhered to the shield shell through a bolt fixing interface, no gap is reserved between the air bag and the shield shell, the elastic steel plate is welded in the circumferential direction on the outer side of the air bag, a double-seam welding process is adopted, the width of a welding seam is not less than 5mm, the lap joint length of 10-15 cm is reserved at the two ends of the steel plate, the lap joint is sealed by adopting double-seam welding, the air pressure in the air bag is required to meet the slurry blocking balance requirement, and the calculation formula of the air pressure is as follows: , Wherein, the For the desired air pressure within the air-bag, As a safety factor, the safety factor of the device, Is the horizontal acting force of the slurry on the steel plate, Is the vertical acting force of the slurry on the steel plate, Is the friction coefficient between the primary support surface and the steel plate, Is the contact area between the air bag and the primary support surface.
4. The waterproof construction method for the air pushing of the submarine tunnel shield machine according to claim 1, wherein the steps of arranging mortar backfill pipelines and preparing high-performance mortar comprise the steps of welding rigid pipelines at preset angle positions of a shield body, adopting sealing welding and fixing the rigid pipelines and the shield body, connecting high-pressure flexible pipelines between the shield body and a mortar pump, arranging at least 2 pipelines at each arrangement point to form a redundant standby system, and ensuring the continuity of mortar conveying; the mixing ratio of the mortar is configured according to the following range of 120-160 kg/m < 3 >, 200-260 kg/m < 3 > of fly ash, 60-100 kg/m < 3 > of bentonite, 900-1100 kg/m < 3 > of aggregate, 350-410 kg/m < 3 > of water and 8-14 kg/m < 3 > of additive.
5. The waterproof construction method for the air pushing of the submarine tunnel shield machine according to claim 1, wherein the method for installing and fastening the longitudinal annular connecting structure by adopting the wedge-shaped ring segments according to a preset sequence comprises the following steps: S31, stopping the shield machine from advancing when the shield is tunneled to a preset length and the stroke of a pushing cylinder at the position where the sealing block is to be installed reaches a set value, and cleaning sundries and slurry in the segment installation area; S32, placing the segments according to preset mounting points, mounting a first segment from the bottom of the tunnel, sequentially mounting adjacent segments, immediately inserting a longitudinal annular connecting bolt into each segment, and fastening by adopting a pneumatic wrench; S33, before the sealing block is installed, a lubricating medium is smeared on the surface of the waterproof sealing strip, and after the sealing block is inserted according to a preset radial stroke, the sealing block is slowly and longitudinally pushed to an installation position; s34, after the pipe piece is installed in place, the pushing oil cylinder at the corresponding position stretches out to jack up the pipe piece, the jacking force is larger than the minimum acting force required for stabilizing the pipe piece, and after the pipe piece installing machine is moved away, the connecting bolts of each ring of pipe pieces are re-tightened for three times, so that the connection tightness is ensured.
6. The method for constructing the submarine tunnel shield machine by air pushing and water prevention according to claim 5, wherein the calculation process of the set value in the stroke of the pushing cylinder comprises the steps of determining a segment outer diameter basic parameter based on the tunnel design section size, calculating an assembly gap reservation coefficient by integrating segment manufacturing errors, shield attitude deviation and curve segment assembly compensation requirements, simultaneously calculating a wedge angle according to segment wedge amount and ring width, and calculating the set value of the stroke of the pushing cylinder by using the reservation coefficient and the wedge angle, wherein the calculation formula of the set value is as follows: , Wherein, the In order to set the stroke setting value of the thrust cylinder, Is the outer diameter of the wedge-shaped ring canal slice, Reserving coefficients for segment assembly gaps, wherein the value range is 0.01-0.03, The thickness of the duct piece sealing gasket is designed, Is the wedge angle of the wedge-shaped ring segment.
7. The method for constructing the submarine tunnel shield machine by air pushing and water proofing according to claim 1, wherein the step of densely filling the gap between the pipe piece and the primary support inner contour comprises the following steps: s41, synchronously injecting high-performance mortar to the back of the duct piece through a plurality of synchronous grouting holes of the shield machine in the pushing process of the shield machine, and dynamically adjusting grouting flow, speed and pressure parameters according to construction working conditions to form an initial filling layer so as to fill a shield tail gap; S42, after the duct piece is separated from the shield tail, a preset pressing and filling pipeline at the outer side of the main machine is utilized, high-power mortar conveying equipment is adopted to directionally press and fill high-performance mortar from the front of the cutter head to gaps between the duct piece and the inner outline of the primary support, and the gaps are ensured to be densely filled; S43, checking the packing compactness through a secondary grouting hole at the top of the pipe piece by adopting a nondestructive testing technology, and when the detection result comprises a void area, adopting double-liquid slurry to carry out slurry filling under pressure; The double-liquid slurry is required to meet the requirements that the compression strength is not less than 5MPa for 3 days, not less than 10MPa for 7 days and not less than 13MPa for 28 days, the grouting pressure is controlled to be 0.8-1 MPa, and the grouting amount is determined according to the volume of a void area and the slurry diffusion characteristic.
8. The waterproof construction method for the air thrust of the submarine tunnel shield machine according to claim 1, wherein the limiting of the displacement and deformation of the segment after the segment is separated from the shield tail comprises the following steps: S51, capturing the displacement state of the segment in real time through a posture monitoring device after the segment is separated from the shield tail, and screwing a preset-specification long-filament rod into a preset-specification secondary grouting hole of the segment when the abnormal posture is detected, so that the front end of the screw rod tightly abuts against the primary supporting surface of the tunnel to form targeted temporary supporting constraint and limit the segment to further displacement; S52, connecting adjacent duct piece blocks in the circumferential direction by adopting a preset number of steel plate connecting pieces after the duct pieces are assembled, tightening and fixing are realized by inserting a wedging component between the steel plate connecting pieces and the duct pieces, and connecting all the annular duct pieces in a penetrating manner by adopting a preset number of channel steel connecting pieces longitudinally to form a ring-longitudinal cooperative drawknot system so as to prevent the duct pieces from loosening and deforming; S53, according to the early strength development characteristic of the filling material, after the high-performance mortar reaches the preset early strength, combining the dual functions of temporary supporting and longitudinal ring drawknot fixation to construct a three-dimensional constraint system for duct piece displacement and deformation.
9. The method for constructing the submarine tunnel shield machine by air pushing and water-proof construction according to claim 8, wherein the method for constructing the submarine tunnel shield machine by air pushing and water-proof construction is characterized by limiting displacement and deformation of a segment after the segment is separated from the shield tail, further comprising calculating constraint counter force required by the segment based on the segment dead weight, lateral force generated by the posture deviation of the shield machine and suspension stress characteristics before the filling body is not stabilized, determining the diameter and strength grade of a filament rod according to the constraint counter force, determining the number and specification of annular steel plate connectors and longitudinal channel steel connectors, and calculating preset early strength required by high-performance mortar by combining segment deformation control permission thresholds, wherein a calculation formula of the preset early strength is as follows: , Wherein, the The early strength of the high-performance mortar is preset, Is the minimum constraint counter force required by the duct piece, As a safety factor, the safety factor of the device, Is the effective contact area of the high-performance mortar and the duct piece.
10. The method for constructing a submarine tunnel shield machine by air pushing and water proofing according to claim 1, wherein the step of dynamically optimizing construction parameters according to monitoring results comprises the steps of obtaining initial grouting pressure Based on submarine tunnel waterproof design standard and segment structure bearing limit, setting segment allowable radial displacement Tube sheet joint allowable stress Selecting grouting pressure safety coefficient according to construction safety level The value range is 1.0-1.2, and the actual radial displacement of the duct piece is obtained through the duct piece state monitoring system Actual stress of segment joint The collected data is subjected to outlier rejection and linear interpolation pretreatment, and grouting pressure optimization is finally performed based on the monitored data and preset parameters, wherein the optimization expression is as follows: , Wherein, the In order to optimize the post-grouting pressure, In order to achieve the initial grouting pressure, the grouting device comprises a grouting device, The radial displacement is allowed for the tube segments, For the actual radial displacement of the segment, The stress is allowed for the segment joint, Is the actual stress of the joint of the pipe sheet, The grouting pressure safety coefficient is used for compensating slurry performance fluctuation and monitoring errors in the construction process.

Description

Waterproof construction method for air pushing of submarine tunnel shield machine Technical Field The invention relates to the technical field of submarine shield waterproof construction, in particular to a waterproof construction method for air pushing of a submarine tunnel shield machine. Background In submarine tunnel engineering construction, a composite construction method combining a shield method and a mine method is the mainstream choice, and is influenced by factors such as submarine complex geological conditions, high water pressure and the like. When the shield tunneling machine tunnels to the primary support tunnel section of the mining method, the tunnel face is not tunneled in front to provide support, and an air pushing mode is needed to pass through the area, but the pressure of rock and soil bodies is lacking in front of the shield tunneling machine in the air pushing process, so that the duct pieces cannot be spliced to form effective extrusion seal, gaps are easily formed between the duct pieces and the primary support tunnel, the problems of tunnel leakage, structural stability reduction and the like are further caused, and the construction safety and long-term operation reliability of the submarine tunnel are seriously threatened. In order to improve the construction effect of the shield machine air pushing section, such as CN102562146B, a construction gap filling method and device for the shield air pushing section are disclosed, the operation efficiency is improved by adopting a three-stage filling mode of bean gravel injection, synchronous grouting and ground tapping grouting, but the technology relies on a ground tapping grouting technology, the construction period is prolonged, a submarine tunnel is influenced by seawater coverage, the technology does not have ground tapping conditions, the technology cannot adapt to a submarine tunnel scene, meanwhile, the grouting process is influenced by the gravity effect and insufficient environmental tightness, the problems of insufficient filling and insufficient grouting still exist, the long-term waterproof effect is difficult to ensure, in addition, application number CN223104576U discloses an auxiliary device for the shield air pushing method tunnel in a long distance, the combined structures such as a concrete guide table, a duct piece liner and a limiting device are adopted, the technology is not optimally designed for the compactness of the back filling, the problem of grouting loss is not solved, the characteristics that the duct piece of a shield tail is in a suspension state are not considered, the duct piece is easily damaged by the gravity effect, the sealing performance of the machine is severely damaged, the sealing performance of the submarine tunnel is not influenced by the sealing stage, and the sealing performance of the shield machine is required to be changed, and the construction stability of the shield machine cannot be satisfied in the state when the sealing stage is in the submarine tunnel is in the state. Disclosure of Invention The invention provides a waterproof construction method for the air pushing of a submarine tunnel shield machine, which aims to solve the technical problem of tunnel leakage generated in the air pushing process of the existing shield machine. The invention provides a waterproof construction method for the air pushing of a submarine tunnel shield machine, which adopts the following technical scheme: A waterproof construction method for the air pushing of a submarine tunnel shield machine comprises the following steps: S1, measuring and trimming primary supports of mine sections and an empty pushing starting room, constructing a multilayer slurry stopping protection system, constructing a guide table, rechecking accuracy, calculating and implementing cutter head front stacking to provide equivalent reverse thrust, laying a mortar backfill pipeline and preparing high-performance mortar; S2, controlling the shield machine to advance at a preset speed, monitoring the state of the shield tail falling out of the duct piece and the shield posture in the advancing process, and synchronously carrying out grouting operation; S3, stopping pushing when the shield machine is driven to a preset condition, installing and fastening the longitudinal annular connecting structure by adopting wedge-shaped ring segments according to a preset sequence, and protecting the waterproof sealing component; s4, tightly filling a gap between the duct piece and the inner outline of the primary support in a combined mode of synchronous grouting, directional pressure filling high-performance mortar and secondary grouting; s5, adopting a combined measure of temporary supporting and ring longitudinal tie fixation, and limiting the displacement and deformation of the segment after the segment is separated from the shield tail by matching with the early strength characteristic of the filling material; s6, monitoring the state of