CN113006808A - Construction method for viscous geological shield initial section to penetrate shallow soil-covered river channel downwards - Google Patents
Construction method for viscous geological shield initial section to penetrate shallow soil-covered river channel downwards Download PDFInfo
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
Abstract
The invention relates to the technical field of river channel construction, in particular to a construction method for a river channel with a viscous geological shield starting section penetrating through shallow soil at the bottom, which comprises a construction process flow and operation key points; the construction process flow comprises the following steps: reinforcing the stratum of the starting end, installing a starting base and sealing a tunnel door; hoisting the shield machine and the rear matched trolley into the well, assembling and debugging; installing a reaction frame, assembling negative ring pipe pieces and breaking a tunnel portal; starting tunneling and load debugging; backfilling and grouting after the shield tail is sealed through the tunnel portal; geological exploration and river current situation investigation are carried out, and river interception measures are taken. The construction method disclosed by the invention is implemented by engineering, can safely, stably, efficiently and economically finish the shield downward crossing of the river channel, finally finish the downward crossing of the shallow-soil-covered river channel at the initial stage of the viscous geological shield by using high standards of quality defect reduction, safety accident reduction, surface approaching sedimentation reduction and molded tunnel upward floating reduction, and provide precious experience for subsequent similar construction.
Description
Technical Field
The invention relates to the technical field of river channel construction, in particular to a construction method for a viscous geological shield initial section to penetrate through a shallow soil-covered river channel.
Background
Along with the increase of the investment of the country to the urban infrastructure, the modern construction of urban rail transit is also developed comprehensively, the shield construction method is known by people more and more by virtue of the remarkable advantages of high mechanization degree, high construction efficiency, small environmental influence, relatively low construction safety risk, high construction quality and the like, the construction process is mature more and more, the shield construction method presents a larger growth trend in the tunnel construction, the shield construction is carried out in large scale in each city, the stratum traversed by the shield tunnel is more and more changeable, the construction environment is more and more complex, the encountered risk source types are more and more diversified, and the risk of river crossing under the shield is increased gradually;
particularly, aiming at the problems that the construction risk is extremely high and the control difficulty of the construction process is extremely high when the shallow soil-covered river channel is penetrated below the shield starting section under the viscous geological condition faced by the construction, the construction method for penetrating the shallow soil-covered river channel below the shield starting section under the viscous geological condition is provided based on the working condition.
Disclosure of Invention
The invention aims to provide a construction method for a viscous geological shield initial section to penetrate through a shallow soil-covered river channel downwards, which solves the existing problems: aiming at the viscous geological condition faced by the project, the shield starting section penetrates through the shallow soil-covered river channel, the construction risk is extremely high, and the control difficulty of the construction process is extremely high.
In order to achieve the purpose, the invention adopts the following technical scheme:
a construction method for a viscous geological shield initial section to penetrate a shallow soil covered river channel downwards comprises a construction process flow and operation key points;
the construction process flow comprises the following steps:
reinforcing the stratum of the starting end, installing a starting base and sealing a tunnel door;
hoisting the shield machine and the rear matched trolley into the well, assembling and debugging;
installing a reaction frame, assembling negative ring pipe pieces and breaking a tunnel portal;
starting tunneling and load debugging;
backfilling and grouting after the shield tail is sealed through the tunnel portal;
geological exploration and river current situation investigation are carried out, and river interception measures are taken;
theoretically calculating and setting tunneling parameters and simultaneously making emergency preparation;
before crossing a river, making a water stop ring by secondary grouting construction, and acquiring surface monitoring data;
shield tunneling, tightly controlling tunneling parameters and grouting amount, and optimizing slurry ratio;
construction monitoring is enhanced, river routing inspection is well carried out, and information is fed back in time;
strengthening secondary grouting, applying a water stop ring, and performing settlement monitoring;
dredging the river channel and recovering the water level of the river channel;
and finishing river crossing construction, and entering a subsequent normal tunneling stage.
Further, the operation key points comprise construction preparation, tunnel portal sealing installation, tunnel portal plugging, shallow-covered river channel downward penetration construction, river channel closure and tunnel segment shield tunneling parameter setting.
Further, the construction preparation comprises geological exploration, field visit, settlement measuring points, mechanical and electrical equipment and the like for maintenance and related material equipment is prepared in advance.
Furthermore, the sealing installation of the tunnel door comprises the step of measuring the position deviation of the installation screw hole before installation, the bolt of the pressing plate is screwed during installation, and the installation directions of the rubber curtain cloth and the fan-shaped pressing plate need to be noticed.
Further, the tunnel portal plugging comprises the steps of constructing a water stop ring, filling zero-ring grouting and tunnel portal sealing positions, and keeping grouting continuous and uninterrupted in the grouting process.
Further, the tunnel portal is plugged, and if the effect is not ideal, double-liquid slurry is injected into the tunnel portal to plug a leakage channel at the sealing position of the tunnel portal.
Further, the construction of the downward shallow-covered river channel comprises a technical measure of the shield downward shallow-covered river channel construction and a risk control measure of the shield downward shallow-covered river channel.
Furthermore, the shield tunneling shallow-earthing river channel construction technical measures comprise shield tunneling technical measures, segment assembling technical measures, post-grouting technical measures and monitoring measurement technical measures.
Further, the risk control measures for the shield to downwards penetrate through the shallow-covered river channel comprise risk control measures before the shield downwards penetrates through the river channel, risk control measures in the process of downwards penetrating through the river channel by the shield, and risk control measures after downwards penetrating through the river channel by the shield.
The invention has at least the following beneficial effects:
the construction method has been practiced by engineering, can safely, stably, efficiently and economically finish the shield downward crossing of the river channel, finally finish the downward crossing of the shallow soil-covered river channel at the initial stage of the viscous geological shield by using the high standards of quality defect reduction, safety accident reduction, surface approaching sedimentation reduction and upward floating reduction of a forming tunnel, and provide valuable experience for subsequent similar construction.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of the construction process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A construction method for a viscous geological shield initial section to penetrate through a shallow soil covered river channel comprises a construction process flow and operation key points;
the construction process flow comprises the following steps:
firstly, reinforcing the stratum of a starting end, installing a starting base and sealing a tunnel door;
secondly, hoisting the shield machine and a rear matched trolley into the well, assembling and debugging;
thirdly, mounting a reaction frame, assembling negative ring pipe pieces and breaking a tunnel portal;
fourthly, starting tunneling and load debugging;
fifthly, backfilling and grouting the shield tail after the shield tail is sealed through the tunnel portal;
sixthly, geological exploration and river current situation investigation are carried out, and river interception measures are taken;
seventhly, theoretically calculating and setting tunneling parameters and simultaneously making emergency preparation;
before the shield tunnel passes through the river channel, corresponding emergency materials are prepared according to possible emergency conditions and stored in a construction site, and meanwhile, emergency power generation equipment is prepared beside the river channel;
eighthly, before river crossing, secondary grouting construction is carried out to manufacture a water stop ring, and earth surface monitoring data are collected; wherein, secondary slip casting and seal ring are executed, cement and water glass double-liquid slurry are selected, the water cement ratio is 0.6: 1-1: 1 (mass ratio), cement slurry: water glass 1:1 (volume ratio); after the pipe piece is separated from the shield tail by 3 rings, secondary grouting is immediately carried out, and the secondary grouting amount of each ring is 0.3-0.7 m3Grouting pressure is not less than 1 Mpa; the hole door is plugged and water stop rings pass through the front and the back of the river channel, cement and water glass double-liquid slurry are selected, and the cement and water glass double-liquid slurry is matched in the same way, so that the effects of isolating rich underground water near the river channel and ensuring the subsequent synchronous grouting effect are achieved; meanwhile, good quality can be ensured through secondary grouting, and the phenomena of tunnel water leakage and floating of the control duct piece are reduced;
step nine, shield tunneling, strictly controlling tunneling parameters and grouting amount and optimizing slurry ratio;
the slag output and the soil output in the tunneling process are also strictly controlled according to the theoretical soil output (considering the improvement of slag and the loosening coefficient of soil), after each ring is converted according to the advancing stroke of 1.6m, the soil output is controlled at 116-120 m by taking the statistics of the soil output of the starting section of the shield as reference3About (theoretical soil output of 98.2 m)3)。
Improving the residue soil: in the process of excavating a muddy clay stratum, when the improvement of dregs is not good, the earthwork is easy to overetch, the shield posture is difficult to control, a cutter head is stuck with mud cakes, segments float upwards and the like, and then the excavating parameters are abnormal, and the quality of a formed tunnel is seriously influenced. In order to ensure that the muck has good workability and fluidity, aiming at the characteristics of the stratum, high-quality foam is selected for improving the muck; meanwhile, a polymer additive is prepared, and if underground water is large during river crossing, a certain polymer can be added into the foam stock solution for improving the residue soil. In the aspect of shield tunneling control, the spiral rotating speed is controlled to be matched with the pressure of an earth bin, slag temperature management is enhanced, and the proportion and the injection amount of a slag soil modifier are dynamically adjusted;
the tunneling parameter summary is that in the shield construction process, the shield propulsion parameters need to be adjusted in time during the construction process according to the changes of various conditions such as stratum changes, shield tunnel burial depth and the like, but the mechanical parameters of various soil layers in the section are basically similar, the shield burial depth changes less, the shield parameter changes have certain regularity, and from the monitoring conditions of settlement in the shield initial section construction process and the postures of a shield machine and segments, the shield machine keeps the following parameter propulsion in the shallow earth-covering river section:
tenth step, reinforcing construction monitoring, making river channel inspection, and feeding back information in time;
step ten, reinforcing secondary grouting, constructing a water stop ring, and performing settlement monitoring;
wherein, monitoring and measuring: aiming at the complex construction condition that a shallow soil-covered river channel penetrates through the bottom of an initial section of a muddy clay stratum, in order to strictly monitor the stratum settlement condition and strengthen the risk control during the passage through the shallow soil-covered river channel, encryption monitoring measures are adopted at the initial section and two banks of the river channel;
a twelfth step of dredging the river channel and recovering the water level of the river channel;
and step thirteen, completing river crossing construction and entering a subsequent normal tunneling stage.
The operating point is as follows;
construction preparation:
(1) the landform, the stratum, the lithology, the geological structure and the hydrogeological conditions of the river are fully known, and hydrogeological data of the first hand of the river channel part are found out.
(2) Obstacles and conditions affecting shield construction, such as pine piles and the like applied in river course treatment, can appear on the ground during visiting and surveying the river bottom.
(3) Settlement measuring points are arranged on the ground around the river channel and on bridge abutment piers, and settlement informatization monitoring control is carried out by matching with relevant management departments.
(4) In order to ensure that the shield machine smoothly passes through a river, mechanical and electrical equipment and the like in shield construction must be overhauled before passing through, particularly the sealing and water stopping effects at the tail sealing and hinging part of the shield are mainly checked, and the working state of the shield machine is ensured to be good;
and (3) maintenance of shield equipment, namely, aiming at the complex construction condition that a muddy clay stratum initial section penetrates through a shallow soil-covered river channel downwards, in order to ensure that the shield smoothly penetrates through the shallow soil-covered river channel downwards, the continuous and stable operation of the shield must be ensured. Therefore, before the shield machine passes through a special risk source, the shield machine needs to be overhauled and maintained comprehensively according to the running condition of the shield machine, and the good state of the shield machine is ensured.
(5) Related material equipment is prepared in advance, such as: the grouting hole duct piece, basic material consumption of shield construction, secondary grouting raw material and equipment are added, and safe, stable and continuous tunneling is guaranteed during river crossing of the shield.
Sealing and installing the tunnel door:
when the shield machine tunnels along the propelling direction, the fan-shaped pressing plate with the hinge joint is driven by the shield machine to rotate clockwise, supports the sealing rubber plate and is sealed at the outer diameter of the shield tail to stop water from flowing into the starting well;
before installation, measuring the position deviation of the installation screw hole, and cleaning the screw hole by using a screw; when the shield is installed, the pressing plate bolt is screwed down, so that the curtain cloth rubber plate is tightly attached to the tunnel portal, and the leakage of slurry during synchronous grouting after the shield is started is prevented; when the hole door sealing device is installed, attention needs to be paid to the installation directions of the rubber curtain cloth and the fan-shaped pressing plate. The protruding direction of the end of the rubber curtain cloth is the same as the shield tunneling direction.
Plugging a hole door:
(1) according to design requirements and related construction experience, firstly adopting double-liquid slurry to apply a water stop ring at the sealing position of the opening, and adopting a shield tail synchronous grouting device to fill slurry during filling and grouting; the fan-shaped pressing plate is in an inward-turning form, so that the requirement for resisting grouting pressure can be met.
(2) When the shield machine starts to tunnel to the 5 th ring and the shield receiving shield machine completely drags out of the shield tail, synchronous grouting is started to fill the zero-ring grouting and the tunnel portal sealing position, all grouting holes in the whole ring need grouting filling, and in the grouting process, the soil bin pressure and the tunnel portal leakage condition are closely concerned.
(3) In the grouting process of the portal plugging, continuous and uninterrupted grouting is kept, and the grouting plugging quality of the whole ring is ensured.
(4) And if the sealing effect of the tunnel portal is not ideal, injecting double-liquid slurry into the tunnel portal to plug the leakage channel at the sealing position of the tunnel portal.
(5) And when the tunnel portal is sealed and has no obvious leakage, filling in a shield tail synchronous grouting mode. The grouting amount is controlled by grouting pressure, and the maximum pressure is not more than 0.35 MPa.
(6) The sealing part of the portal is a circular section, so that grout at the arch top is easy to fill and is not dense, grouting pressure and grouting amount need to be strictly stared and controlled in the sealing and grouting process, and the dense effect of vault top grouting needs to be checked after grouting is finished, so that the whole ring is guaranteed to be densely filled.
The construction of the river channel with shallow covered soil penetrating downwards comprises a technical measure of the construction of the river channel with shallow covered soil penetrating downwards by the shield and a risk control measure of the river channel with shallow covered soil penetrating downwards by the shield.
The shield is under-penetrated shallow earthing river channel construction technical measure:
(1) the shield tunneling technical measure is characterized in that the following shield tunneling technical measures are adopted according to the past shield construction experience and related theoretical knowledge and by combining the concrete conditions of the project:
firstly, monitoring the shield attitude by adopting an automatic tunnel guiding system and manual measurement assistance;
and secondly, controlling the tunneling direction by operating a thrust cylinder of the shield tunneling machine in a partitioning manner according to a segmented axis fitting control plan made according to line conditions and shield attitude information reflected by a guiding system and combining tunnel stratum conditions.
And thirdly, the slag discharge amount of the shield is strictly controlled, and the ground surface settlement caused by over excavation is avoided.
Fourthly, the area mainly penetrates through clay stratums, geological prediction needs to be done in the tunneling process, tunneling parameters need to be reasonably controlled, muck improvement needs to be optimized, and the mud cake phenomenon is prevented.
Fifthly, adjusting the shield tunneling attitude and correcting the deviation by adjusting the pressure of each group of thrust cylinders. In general, if the shield tunneling machine deviates by 20 mm from the design axis, deviation rectification is performed. The correction process is carried out gradually and cannot be completed at one time, the horizontal direction of each ring of correction is not more than 2 mm, and the vertical direction of each ring of correction is not more than 3 mm. A large amount of value deviation correction is avoided, and disturbance of a soil body is reduced, so that the shield tunneling machine can stably pass through the lower portion of a river channel.
(2) The technical measures of segment assembly are as follows:
firstly, before assembling, measuring the gap between the shield tails, and selecting a proper segment assembling point position according to actually measured data.
And secondly, before assembly, cleaning mud blocks and slurry on the previous ring pipe piece to ensure that the ring surface is clean and has no sludge.
And thirdly, during assembly, the roundness of the primary lining ring is ensured, and the expansion sequence of the propulsion oil cylinder is consistent with the assembly sequence of the pipe pieces.
Fourthly, bolt three-time re-tightening: after each ring is pushed, the connecting bolt needs to be screwed down. The lower ring is tightened once when advancing. And (4) tightening the segment connecting bolt within 10 rings once every 3 rings of tunneling are completed.
Wherein section of jurisdiction quality inspection of advancing is accepted, arranges the special messenger, organizes the supervision, to section of jurisdiction quality inspection of advancing, detects whether section of jurisdiction intensity satisfies the designing requirement, checks whether the section of jurisdiction has damage, crackle, if there is the defect, in time withdraws the tube piece factory.
(3) Grouting after the wall technical measures:
through multiple mixing ratio tests, the most appropriate mixing ratio of synchronous grouting slurry is selected, the initial setting time of the slurry is ensured to be matched with the shield tunneling speed, and the segment is prevented from floating upwards or deviating.
And secondly, in the shield tunneling process, the synchronous grouting amount and the grouting pressure are reasonably controlled, and the filling of gaps behind the segment walls is full.
And thirdly, selecting proper secondary grouting frequency according to the actual situation on site. If water leakage occurs, secondary grouting is adopted in time.
(4) Monitoring and measuring technical measures, providing basis for accurately knowing the ground deformation condition when the shield starts, providing information construction for shield construction, and taking the following measures in the shield starting section for monitoring:
firstly, strengthening the monitoring of the settlement of the earth surface of the starting section and the river course, forming a monitoring daily report every day and releasing monitoring data information in time;
secondly, building (structure) settlement monitoring: in the shield construction process, monitoring of a gantry crane foundation, an underground pipeline and a peripheral building at the end is enhanced;
increasing monitoring frequency: before construction, the original data is observed for many times, and the average value of the original data is taken as the original data, so that the accuracy of the original data is ensured. Increasing monitoring frequency on the basis of original monitoring during shield crossing, and gradually reducing monitoring times after settlement tends to be stable after shield crossing;
and fourthly, the measured data is collected and reported to the engineering department in time so as to know the construction current situation and the change condition of the corresponding area in time, determine new construction parameters, grouting amount and other information and instructions, and transmit the information and instructions to a shield manipulator, so that the shield is propelled to be adjusted correspondingly in time, and the construction safety of the shield tunnel is ensured.
And fifthly, adopting informatization construction, before construction, establishing a coordination linkage mechanism and an information transmission channel with units such as owners, supervisors, headquarters, third-party monitoring and the like, ensuring smooth information communication and creating conditions for the informatization construction.
Monitoring information is fed back, the monitoring information is fed back in real time, and shield construction monitoring information is fed back in time according to the specified monitoring frequency;
monitoring analysis, namely performing real-time analysis and stage (week/month) analysis according to the monitoring measurement data, performing scientific and reasonable evaluation on the disturbance condition of the stratum, the safety state of the shield tunnel and the like, and providing corresponding suggestions; the shield construction monitoring is a conventional monitoring project and mainly aims at ground settlement within the influence range of ground reinforcing construction and shield construction, clearance convergence of a shield tunnel structure and vault settlement monitoring.
And (3) performing information construction, dynamically adjusting construction parameters according to the monitoring data and the analysis result, and taking targeted technical measures and emergency measures or starting related emergency programs according to an emergency plan.
A risk control measure of a shield tunnel penetrating through shallow soil covered river is taken;
(1) and (3) risk management and control measures before the shield downwards penetrates the river channel:
firstly, the periphery of the ground is explored in detail, and the construction safety is ensured.
Secondly, construction monitoring on the periphery of a river bank is enhanced, two sections are encrypted on the river banks on two sides of the river channel in the aspect of point location, each section is provided with 5 measuring points, a section is additionally arranged at the junction between the river and the ground, 2 axis measuring points are additionally arranged, and 22 measuring points are additionally arranged; in terms of frequency, from once a day to twice a day treatment.
And thirdly, in order to ensure that the shield machine smoothly passes through rivers, mechanical and electrical equipment and the like in shield construction are overhauled before passing through, especially the sealing and water stopping effects at the tail sealing and hinging parts of the shield are mainly checked, and the working state of the shield machine is ensured to be good.
Fourthly, the slurry proportion is optimized, and the grouting amount is reasonably set.
(2) And (3) risk management and control measures in the process of downwards penetrating the river channel by the shield:
firstly, in the tunneling process, the shield is kept to stably tunnel, the parameter adjustment is not too large, and the soil body disturbance is avoided to be large;
secondly, reinforcing shield tail brush protection: 150Kg of shield tail grease is annularly drilled in the tunneling process;
and thirdly, in the tunneling construction process, tunneling parameters such as soil pressure, total thrust, cutter head torque and the like need to be closely paid attention. If an abnormality occurs, the cause is found immediately, and the construction with a fault is not possible.
And fourthly, strictly implementing a leader shift system. On-site workers on duty take the guarantee of safe production as the first responsibility, really master the safe production condition on duty, strengthen the inspection and inspection of key parts and key links and eliminate hidden dangers.
Strengthening on-site inspection. And arranging fixed personnel, continuously patrolling the river surface for 24 hours, reporting the abnormal condition at the first time, and adjusting the shield tunneling parameters and starting emergency according to the actual condition by an operator on duty in a monitoring room through a project monitoring telephone.
(3) And (3) risk management and control measures after the shield downwards penetrates through the river channel:
firstly, regular inspection is well done. Arranging a specially-assigned person, patrolling the river surface after the shield passes through the river channel, reporting the abnormal situation at the first time, and taking corresponding emergency measures according to the actual situation.
Secondly, strengthening secondary grouting. After the shield passes through the river course, in time strengthen the secondary slip casting, ensure to fill full behind the section of jurisdiction wall, promote tunnel waterproof ability, reduce tunnel come-up risk, guarantee tunnel later stage operation safety.
River closure: in order to ensure that the shield safely, stably and smoothly passes through the shallow covered river channel, the construction risk is reduced, river channel interception measures are taken, and the water level is reduced.
And (3) setting tunneling parameters of the cross river section shield: calculating other parameter settings and other parameter settings of the soil bin pressure; the total thrust is used for overcoming the resultant forces of soil bin counter force and cutter cutting counter force, the friction force between a shield shell of the shield host and a soil body, the traction resistance of a rear matched trolley and the like; controlling the thrust to be 1300-1600T through theoretical calculation;
the cutter torque is used for overcoming the counter force of the soil body in the process of cutting the soil body by the rotation of the cutter, and is controlled to be 2200-2800 KN m in the construction through theoretical calculation;
synchronous slip casting takes qualified quality ordinary acid salt cement mortar as synchronous grouting material strictly according to the design requirement, wears shallow earthing river way to silt matter clay stratum down, and groundwater is abundanter situation, ensures thick liquid initial set time and water-proof effects, screens, optimizes synchronous slip casting mix proportion through many gradient tests, forms following mix proportion:
synchronous grouting mixing proportion table:
| name of Material | Water (W) | Sand | Bentonite clay | Fly ash | Cement |
| Mass (Kg/m)3) | 460 | 850 | 90 | 430 | 150 |
The process principle is as follows:
the geological condition and the river channel condition are investigated in detail by combining with the design overview through detailed geological exploration, and theoretical basic guarantee is provided for parameter setting during the period that the shield penetrates the river channel downwards through theoretical calculation;
for the shield starting end, a tunnel portal is plugged in time, a water stop ring is applied, and the shield starting risk is reduced;
in the process of the shield tunneling through the river channel, strictly controlling shield tunneling parameters, particularly the soil bin pressure, and strictly preventing the river bottom breakdown risk by taking theoretical calculation as a basis;
in the process that the shield penetrates the river channel downwards, the synchronous grouting amount is strictly controlled, and the soil body at the bottom of the river is prevented from settling; strengthening secondary grouting, enhancing the water resistance of the tunnel and eliminating a possibly existing catchment channel; the slurry mixing proportion is optimized, the initial setting time of the slurry is improved, and the upward floating of the segments in the shallow earthing river-crossing process is prevented.
River channel interception measures are adopted, so that the water level is reduced, and the construction risk is reduced;
the construction monitoring is intensified, particularly the surface subsidence monitoring of the river and the starting end head, the informatization construction is adopted, and the feedback is carried out in time;
after the tunnel is penetrated, secondary grouting is strengthened, construction monitoring is well conducted, the river channel is dredged in time, the water level is recovered, the floating risk of the tunnel is reduced, and the later-stage operation safety is guaranteed.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and their equivalents.
Claims (9)
1. A construction method for a viscous geological shield initial section to penetrate through a shallow soil covered river channel is characterized by comprising a construction process flow and operation key points;
the construction process flow comprises the following steps:
reinforcing the stratum of the starting end, installing a starting base and sealing a tunnel door;
hoisting the shield machine and the rear matched trolley into the well, assembling and debugging;
installing a reaction frame, assembling negative ring pipe pieces and breaking a tunnel portal;
starting tunneling and load debugging;
backfilling and grouting after the shield tail is sealed through the tunnel portal;
geological exploration and river current situation investigation are carried out, and river interception measures are taken;
theoretically calculating and setting tunneling parameters and simultaneously making emergency preparation;
before crossing a river, making a water stop ring by secondary grouting construction, and acquiring surface monitoring data;
shield tunneling, tightly controlling tunneling parameters and grouting amount, and optimizing slurry ratio;
construction monitoring is enhanced, river routing inspection is well carried out, and information is fed back in time;
strengthening secondary grouting, applying a water stop ring, and performing settlement monitoring;
dredging the river channel and recovering the water level of the river channel;
and finishing river crossing construction, and entering a subsequent normal tunneling stage.
2. The construction method of the shallow-covered river channel penetrating through the shield initial section of the viscous geological shield according to claim 1, wherein the operation key points comprise construction preparation, tunnel portal sealing installation, tunnel portal plugging, shallow-covered river channel penetrating through the bottom construction, river channel closure and tunnel penetrating section shield tunneling parameter setting.
3. The construction method of the viscous geological shield initial section through the shallow soil covered river channel is characterized in that the construction preparation comprises geological exploration, field visit, settlement measuring points, mechanical and electrical equipment and the like for maintenance and related material equipment is prepared in advance.
4. The construction method of the river channel with shallow soil covering penetrating through the beginning section of the viscous geological shield according to claim 2, wherein the sealing installation of the tunnel portal comprises measuring the position deviation of an installation screw hole before installation, a pressing plate bolt is screwed during installation, and the installation directions of the rubber curtain cloth and the fan-shaped pressing plate need to be paid attention to.
5. The construction method of the shallow soil covered river channel penetrating from the beginning section of the viscous geological shield according to claim 2, wherein the tunnel portal blocking comprises the steps of constructing a water stop ring, filling zero-ring grouting and tunnel portal sealing positions, and keeping grouting continuously and uninterruptedly in the grouting process.
6. The construction method of the shallow soil covered river channel penetrating through the bottom of the shield initiation section of the viscous geological shield according to claim 5, characterized in that the tunnel portal is plugged, and if the effect is not ideal, a double-liquid slurry injected into the tunnel is adopted to plug a leakage channel at the sealing position of the tunnel portal.
7. The construction method of the viscous geological shield initiation section downward-penetrating shallow-soil-covered river channel according to claim 2, wherein the downward-penetrating shallow-soil-covered river channel construction comprises shield downward-penetrating shallow-soil-covered river channel construction technical measures and shield downward-penetrating shallow-soil-covered river channel risk control measures.
8. The construction method of the shallow-covered river channel penetrated downwards by the shield initiation section of the viscous geological shield according to claim 7, wherein the technical measures of the shallow-covered river channel penetrated downwards by the shield comprise a shield tunneling technical measure, a segment splicing technical measure, a wall post-grouting technical measure and a monitoring and measuring technical measure.
9. The construction method of the viscous geological shield initial section downward-penetrating shallow-soil-covered river channel according to claim 7, wherein the shield downward-penetrating shallow-soil-covered river channel risk control measures comprise a shield downward-penetrating river channel front risk control measure, a shield downward-penetrating river channel in-process risk control measure and a shield downward-penetrating river channel rear risk control measure.
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Cited By (1)
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