CN114508357A - Synchronous double-liquid grouting process for large-diameter shield tunnel - Google Patents
Synchronous double-liquid grouting process for large-diameter shield tunnel Download PDFInfo
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- CN114508357A CN114508357A CN202111441515.1A CN202111441515A CN114508357A CN 114508357 A CN114508357 A CN 114508357A CN 202111441515 A CN202111441515 A CN 202111441515A CN 114508357 A CN114508357 A CN 114508357A
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- liquid
- grouting
- pipeline
- shield tunnel
- synchronous double
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- 239000007788 liquid Substances 0.000 title claims abstract description 209
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012544 monitoring process Methods 0.000 claims abstract description 19
- 230000005641 tunneling Effects 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 21
- 238000003860 storage Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000010865 sewage Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 238000002347 injection Methods 0.000 abstract description 5
- 239000007924 injection Substances 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 5
- 238000010276 construction Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000007569 slipcasting Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 238000009827 uniform distribution Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a synchronous double-liquid grouting process for a large-diameter shield tunnel, which comprises the following steps of: s1, setting A, B grouting pressure, grouting speed and grouting mixture ratio of the liquid on a control system respectively; s2, opening the liquid A supply pipeline and the liquid B supply pipeline to mix the liquid A, B in the mixer to form a mixed liquid; and S3, monitoring A, B real-time flow of the liquid by a monitoring unit, feeding the result back to a control system, automatically adjusting the flow of the liquid A and the flow of the liquid B after the feedback is received by the control system, controlling the actual mix ratio of A, B liquid to be basically consistent with the theoretical mix ratio, and synchronously injecting the liquid into a shield tail gap through a grouting pipeline along with the propulsion of the shield tunneling machine. According to the invention, the real-time flow of the liquid A and the liquid B is monitored and controlled, so that the precise control and adjustment of the mixing ratio and the injection amount of the liquid A and the liquid B are realized, the precision of double-liquid synchronous grouting is improved, and the grouting quality is ensured; meanwhile, the structure is reliable, and the implementation is simple and convenient.
Description
Technical Field
The invention belongs to the technical field of grouting, and particularly relates to a synchronous double-liquid grouting process for a large-diameter shield tunnel.
Background
In the shield tunneling process, the outer diameter of a cutter head of a shield is larger than the outer diameter of a lining segment, and a shield shell has certain thickness, in addition, the phenomena of overexcavation and the like exist in the tunneling process, after a shield tail is separated from the segment, an annular gap can appear between the segment and a stratum, and the shield tail gap is usually filled by adopting a synchronous grouting technology in the actual shield tunnel engineering.
Currently, the commonly used grouting slurry in shield tunnel construction can be roughly divided into two types, namely a single-fluid grouting material and a double-fluid grouting material. The double-fluid slurry is prepared by pumping A, B fluid from two pipelines, mixing in the slurry injection hole of the shield tail and injecting into the gap of the shield tail. The liquid A is cement-based material, and the liquid B is usually water glass material as a hardening agent. In the actual shield tunnel engineering, the proportion of the double slurry is properly adjusted, so that the stone body has higher early strength, the shield tail is effectively filled, and the ground surface settlement is controlled. Therefore, the double-fluid slurry is often applied to the water-rich environment of tunnel shield construction, the synchronous grouting of soft soil layers and the secondary grouting of conventional shield construction.
However, in the actual construction process, because liquid A and liquid B are difficult to adjust through flow rate control, the precision is poor, the flow statistics is inaccurate, and the mixing ratio of A, B liquid cannot be accurately controlled, so that the actual mixing ratio and the theoretical mixing ratio of liquid A and liquid B are easy to have great difference, the synchronous grouting slurry cannot be quickly cemented and fill the pores, the situations of floating, damage, deformation, weakened water-stopping sealing effect and the like of the duct piece are easy to cause, and the service life cycle and the safety of the whole project are greatly adversely affected.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an improved synchronous double-liquid grouting process for a large-diameter shield tunnel.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a synchronous double-liquid grouting process for a large-diameter shield tunnel adopts grouting equipment comprising a liquid A supply pipeline, a liquid B supply pipeline, a mixer, a grouting pipeline, a monitoring unit and a control system, wherein the liquid A supply pipeline, the liquid B supply pipeline and the grouting pipeline are respectively communicated with the mixer, the monitoring unit monitors the real-time flow of the liquid A and the liquid B in real time, the control system is used for setting various grouting parameters of the liquid A and the liquid B and automatically controls and adjusts the grouting parameters according to the real-time flow, and the synchronous double-liquid grouting process comprises the following steps:
s1, respectively setting A, B grouting pressure, grouting speed and grouting mixing ratio of the liquid on a control system according to working conditions;
s2, opening the liquid A supply pipeline and the liquid B supply pipeline to mix the liquid A, B in the mixer to form a mixed liquid;
s3, monitoring A, B real-time flow of the liquid by the monitoring unit, feeding the result back to the control system, automatically adjusting the flow of the liquid A and the flow of the liquid B after the feedback is received by the control system, controlling the actual mixing ratio of A, B liquid to be basically consistent with the theoretical mixing ratio, enabling the mixed liquid to reach a gelling state, and synchronously injecting the mixed liquid into a shield tail gap through a grouting pipeline along with the propulsion of the shield machine.
Preferably, in S1, the mixing ratio of the solution A to the solution B is 14-16: 1. By the arrangement, the mixed liquid of the liquid A and the liquid B is in a gelled state before reaching the stratum, and the injection property is better.
Preferably, in S2, the a liquid supply line is opened first, and the B liquid supply line is opened again while the grouting pressure of the a liquid is kept stable. So set up, A, B liquid can the homogeneous mixing, and it is stable to guarantee to mix the liquid velocity of flow, improves the slip casting quality.
Further, the synchronous double-liquid grouting process also comprises the following steps: s4, after grouting with A, B liquid is completed, flushing a grouting pipeline through high-pressure water, observing discharged sewage, and completing cleaning when the sewage is clear. The grouting device is arranged like this, and after grouting is implemented at every time, slurry remained in a grouting pipeline is effectively prevented from being condensed to cause blockage, and the next grouting construction is guaranteed to be smooth.
Preferably, the mixer is arranged 2-5 m away from a liquid outlet of the grouting pipeline. By the arrangement, the grouting distance is short, and the grouting efficiency is high; simultaneously, guarantee A, B liquid mixing effect, and reduce the phenomenon that condenses in the slip casting pipeline, reduce the working strength that later stage washd the pipeline.
Specifically, a three-way automatic valve is also arranged between the liquid outlet of the mixer and the liquid inlet of the grouting pipeline. The arrangement is convenient for realizing automatic back flushing of high-pressure water.
Preferably, the liquid A supply pipeline, the liquid B supply pipeline, the mixer, the grouting pipeline and the monitoring unit form a grouting group, and the grouting equipment comprises a plurality of grouting groups. By the arrangement, multi-point synchronous grouting is realized, the uniform distribution of slurry in the stratum is ensured, and the soil strength and bearing capacity after grouting are ensured.
Preferably, the grouting equipment further comprises an A liquid slurry storage tank, a B liquid slurry storage tank, an A liquid grouting pump correspondingly arranged on each A liquid supply pipeline, and a B liquid grouting pump correspondingly arranged on each B liquid supply pipeline, wherein each A liquid grouting pump and each B liquid grouting pump can be independently controlled. The setting is convenient for control the grouting amount flexibly according to the requirement.
Preferably, the monitoring unit is an electromagnetic flow meter provided at each of the liquid a grouting pump and the liquid B grouting pump.
In addition, the bottom of liquid A mud storage tank still is equipped with a plurality of weighing sensor. By the arrangement, the control system can supplement slurry in time according to the weight of the slurry storage tank, so that material shortage is avoided.
Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:
according to the invention, the real-time flow of the liquid A and the liquid B is monitored and controlled, so that the precise control and adjustment of the mixing ratio and the injection amount of the liquid A and the liquid B are realized, the precision of double-liquid synchronous grouting is improved, and the grouting quality is ensured; meanwhile, the structure is reliable, and the implementation is simple and convenient.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, specific embodiments thereof are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship that is indicative of but not limiting of the present application, merely for the convenience of describing and simplifying the present application, and that it is not intended or implied that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
The synchronous double-liquid grouting process for the large-diameter shield tunnel is used for synchronously injecting liquid A and liquid B into a shield tail gap by adopting grouting equipment in the propelling process of a shield machine, wherein the liquid A adopts slurry, and the liquid B adopts water glass.
Specifically, the grouting equipment comprises a liquid A slurry storage tank, a liquid A grouting pump, a liquid A supply pipeline, a liquid B slurry storage tank, a liquid B grouting pump, a liquid B supply pipeline, a mixer, a grouting pipeline, a monitoring unit and a control system.
For convenience, the liquid supply pipeline a, the liquid supply pipeline B, the mixer, the grouting pipeline and the monitoring unit form a group of grouting groups, and the grouting equipment of the embodiment comprises eight groups of grouting groups. By the arrangement, multi-point synchronous grouting is realized, the uniform distribution of slurry in the stratum is ensured, and the soil strength and bearing capacity after grouting are ensured.
Liquid A stores up thick liquid jar has two, and wherein every liquid A stores up thick liquid jar volume and is 25m dry year, and the bottom of every liquid A stores up thick liquid jar and still evenly distributed has four weighing sensor. The residual amount of the liquid A in the pulp storage tank can be accurately known so as to facilitate the pulp supplement in time.
Eight A liquid grouting pumps are respectively connected below the A liquid grouting storage tank through gate valves, and flushing ports for cleaning grouting pumps are further arranged at the joints, wherein each A liquid grouting pump is hydraulically driven and double-plunger type and can be independently controlled, and the load of each A liquid grouting pump is kept above 50% when the A liquid grouting pump works. The setting is convenient for control the grouting amount flexibly according to the requirement.
Meanwhile, through the test of the applicant, when the load of the liquid A grouting pump is kept above 50%, the flow deviation is +/-5L/min, and the liquid A grouting pump is in a relatively ideal state.
Eight A liquid supply pipelines are correspondingly connected to each A liquid grouting pump.
Liquid B stores up thick liquid jar has one, and wherein this liquid B stores up thick liquid jar volume is 10m dry crops, and bottom evenly distributed has four weighing sensor.
Eight B liquid grouting pumps are connected below the B liquid slurry storage tank through gate valves respectively, wherein each B liquid grouting pump is an electric screw pump and can be controlled independently. The setting is convenient for control the grouting amount flexibly according to the requirement.
Eight B liquid supply lines are correspondingly connected to each B liquid grouting pump.
In this example, the mixer is located 3m from the corresponding outlet of the grouting pipe. By the arrangement, the grouting distance is short, and the grouting efficiency is high; simultaneously, guarantee A, B liquid mixing effect, and reduce the phenomenon that condenses in the slip casting pipeline, reduce the working strength that later stage washd the pipeline.
In this example, each set of grouting lines includes a mixed liquid pipe with specification DN50, a high-pressure water pipe with specification DN25, and a lubricating oil pipe with specification DN10, wherein the mixer is communicated with the mixed liquid pipe during synchronous grouting.
Meanwhile, a nozzle of the high-pressure water pipe is provided with a three-way piston, the middle part of the high-pressure water pipe is provided with a traction oil cylinder, the three-way piston is sealed by elastic polyurethane, and a three-way automatic valve is arranged between a liquid outlet of the mixer and a liquid inlet of the grouting pipeline. The device has the functions of double-liquid mixing, outlet non-return, bypass pressure relief, cleaning reflux and the like.
In this example, the monitoring unit is an electromagnetic flowmeter correspondingly arranged at each of the liquid A grouting pump and the liquid B grouting pump, and forms the real-time flow of A, B liquid as feedback. The A, B liquid flow can be monitored in real time, and the precision is high.
In this example, the control system is a PLC control system, wherein electronic components such as sensors for detecting pressure and flow, a valve group controller and the like are respectively arranged on the liquid a supply pipeline, the liquid B supply pipeline and the grouting pipeline, and the PLC control system is integrally designed according to grouting process requirements, can receive feedback of each sensor, and can perform linkage control on the liquid a and the liquid B by compiling an automatic control program, and finally takes a touch screen form as an operation terminal. The grouting device is comprehensive in information, convenient for constructors to master the state of the whole grouting process, high in control precision and simple and convenient to operate.
The synchronous double-liquid grouting process of the embodiment is as follows:
1. respectively setting the grouting pressure, the grouting speed and the grouting mix proportion of A, B liquid on a control system according to working conditions, wherein the theoretical mix proportion of the liquid A and the liquid B is 15.8: 1;
2. firstly, opening a liquid A grouting pump to enable a liquid A supply pipeline to start to supply liquid, when the grouting pressure of the liquid A is kept stable, opening a liquid B grouting pump to enable a liquid B supply pipeline to start to supply liquid, and mixing the liquid A and the liquid B in a mixer to form mixed liquid;
3. the monitoring unit monitors A, B real-time flow of liquid, and feeds back the result to the control system, the control system automatically adjusts the flow of liquid A and liquid B after receiving the feedback, the actual mixing ratio of liquid A, B is controlled to be basically consistent with the theoretical mixing ratio, the mixed liquid can reach a gelling state, and is synchronously injected into a shield tail gap through a grouting pipeline along with the propulsion of the shield machine;
4. after the slip casting of A, B liquid is completed, the slip casting pipeline is washed by high-pressure water, the discharged sewage is observed, and when the sewage is clear, the cleaning is completed.
In summary, the present embodiment has the following advantages:
1. by monitoring and controlling the real-time flow of the liquid A and the liquid B, the precise control and adjustment of the mixing ratio and the injection amount of the liquid A and the liquid B are realized, so that the slurry can be injected into the shield tail gap in the optimal state;
2. the control of the A, B liquid is integrated to a PLC control system, so that the automation degree and the control precision of the grouting process are high, the construction quality is ensured, and the construction efficiency is improved;
3. the structure is reliable, and the implementation is simple and convenient.
The present invention has been described in detail in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.
Claims (10)
1. A synchronous double-liquid grouting process for a large-diameter shield tunnel is characterized by comprising the following steps: the adopted grouting equipment comprises a liquid A supply pipeline, a liquid B supply pipeline, a mixer, a grouting pipeline, a monitoring unit and a control system, wherein the liquid A supply pipeline, the liquid B supply pipeline and the grouting pipeline are respectively communicated with the mixer, the monitoring unit monitors the real-time flow of the liquid A and the liquid B in real time, the control system is used for setting various grouting parameters of the liquid A and the liquid B and automatically controlling and adjusting the grouting parameters according to the real-time flow, and the synchronous double-liquid grouting process comprises the following steps:
s1, respectively setting A, B grouting pressure, grouting speed and grouting mixing ratio of the liquid on a control system according to working conditions;
s2, opening the liquid A supply pipeline and the liquid B supply pipeline to enable A, B liquid to be mixed in the mixer to form mixed liquid;
s3, monitoring A, B real-time flow of the liquid by a monitoring unit, feeding the result back to a control system, automatically adjusting the flow of the liquid A and the flow of the liquid B after the feedback is received by the control system, and controlling the actual mixing ratio of A, B liquid to be basically consistent with the theoretical mixing ratio, wherein the mixed liquid can reach a gelling state and is synchronously injected into a shield tail gap through a grouting pipeline along with the propulsion of the shield tunneling machine.
2. The synchronous double-liquid grouting process for the large-diameter shield tunnel according to claim 1, characterized in that: in S1, the mixing ratio of the liquid A to the liquid B is 14-16: 1.
3. The synchronous double-liquid grouting process for the large-diameter shield tunnel according to claim 1, characterized in that: in S2, the liquid a supply line is first opened, and when the grouting pressure of the liquid a is kept stable, the liquid B supply line is opened again.
4. The synchronous double-liquid grouting process for the large-diameter shield tunnel according to claim 1, characterized in that: the synchronous double-liquid grouting process further comprises the following steps: s4, after grouting with A, B liquid is completed, flushing a grouting pipeline through high-pressure water, observing discharged sewage, and completing cleaning when the sewage is clear.
5. The synchronous double-liquid grouting process for the large-diameter shield tunnel according to claim 1, characterized in that: the mixer is arranged 2-5 m away from a liquid outlet of the grouting pipeline.
6. The synchronous double-liquid grouting process of the large-diameter shield tunnel according to claim 5, characterized in that: and a three-way automatic valve is also arranged between the liquid outlet of the mixer and the liquid inlet of the grouting pipeline.
7. The synchronous double-liquid grouting process for the large-diameter shield tunnel according to claim 1, characterized in that: the liquid A supply pipeline, the liquid B supply pipeline, the mixer, the grouting pipeline and the monitoring unit form a group of grouting groups, and the grouting equipment comprises a plurality of groups of grouting groups.
8. The synchronous double-liquid grouting process for the large-diameter shield tunnel according to claim 7, characterized in that: grouting equipment still includes A liquid slurry storage tank, B liquid slurry storage tank, corresponds the setting every A liquid grouting pump on the A liquid supply pipeline and correspond the setting every B liquid grouting pump on the B liquid supply pipeline, wherein every A liquid grouting pump with but B liquid grouting pump independent control.
9. The synchronous double-liquid grouting process for the large-diameter shield tunnel according to claim 8, characterized in that: the monitoring unit is an electromagnetic flowmeter arranged at each of the liquid A grouting pump and the liquid B grouting pump.
10. The synchronous double-liquid grouting process of the large-diameter shield tunnel according to claim 8, characterized in that: and the bottom of the liquid A slurry storage tank is also provided with a plurality of weighing sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111441515.1A CN114508357A (en) | 2021-11-30 | 2021-11-30 | Synchronous double-liquid grouting process for large-diameter shield tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111441515.1A CN114508357A (en) | 2021-11-30 | 2021-11-30 | Synchronous double-liquid grouting process for large-diameter shield tunnel |
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| CN114508357A true CN114508357A (en) | 2022-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111441515.1A Pending CN114508357A (en) | 2021-11-30 | 2021-11-30 | Synchronous double-liquid grouting process for large-diameter shield tunnel |
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2021
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Application publication date: 20220517 |
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