CN111594189B - Shield tail wrapping and escaping construction method of shield tunneling machine for tunnel construction - Google Patents
Shield tail wrapping and escaping construction method of shield tunneling machine for tunnel construction Download PDFInfo
- Publication number
- CN111594189B CN111594189B CN202010365845.6A CN202010365845A CN111594189B CN 111594189 B CN111594189 B CN 111594189B CN 202010365845 A CN202010365845 A CN 202010365845A CN 111594189 B CN111594189 B CN 111594189B
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- shield
- shield tail
- tail
- escaping
- tunneling machine
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0064—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes
- B08B7/0071—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by temperature changes by heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/02—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by distortion, beating, or vibration of the surface to be cleaned
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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
- E21D9/093—Control of the driving shield, e.g. of the hydraulic advancing cylinders
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a shield tail wrapping and escaping construction method of a shield tunneling machine for tunnel construction, which comprises the following steps of shield tail cleaning → heating plate installation → vibration auxiliary escaping → shield tunneling machine recovery tunneling; according to the invention, water of an adhesive outside the shield tail is evaporated by electric heating to form a caking, and then the inclusion and the shield tail shell generate a crack by an impact mechanical resonance effect, so that the purpose of getting rid of difficulties is finally realized. The shield tail quick-escaping device is reasonable in design, simple and convenient to operate, low in cost, high in safety coefficient and good in using effect, can solve the actual problem that the shield tail of the shield machine is wrapped to quickly escape, and has good social and economic benefits.
Description
Technical Field
The invention belongs to the technical field of tunnel engineering construction of subways, railways, highways, hydropower and the like, and particularly relates to a shield tail wrapping and escaping construction method of a shield tunneling machine for tunnel construction.
Background
With the development of urban rail transit, shield machines (shield machines) are more and more applied to the development of underground urban spaces, and subway tunnels are concrete embodiments of the successful application of shield machine technology; however, due to the complex underground environment, when slurry leaks from a soft water-containing stratum or a shield tail, the shield tail is wrapped by long-time shutdown, the friction force between the shield tail and the soil layer of the shield tunneling machine is too large, the thrust of the shield tunneling machine is maximized, the pressure of the shield tail hinged oil cylinder is maximized correspondingly, at the moment, the shield tail hinged oil cylinder and the shield tail hinged seal are damaged easily, and the tail shield is deformed seriously. Meanwhile, according to the specific part of the shield tail which is wrapped, the posture of the shield machine is controlled in a targeted manner when getting rid of difficulties, and if the upper part of the shield tail is wrapped, the shield posture is easy to be upward; if the lower part of the shield tail is wrapped, the shield is easy to be downward in posture. Aiming at the characteristics of a passive articulated shield machine, in order to prevent the deformation of a tail shield and reasonably control the posture of the shield machine, the shield machine cannot increase the pushing force to drive forwards blindly, so that the shield machine is in a trapped state.
For the case that the shield tail of the shield machine is wrapped, the shield machine is successfully released by adopting a method for strengthening rigid connection of a hinge part of the shield tail and opening a hole on the shield tail to remove a condensate outside the shell in China, but the method is long in time consumption and large in damage to the original structure of the shield machine.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a simple, quick, safe and reliable construction method for relieving the tail of a shield tunneling machine, and the method follows the following steps: cleaning the tail of the shield → installing a heating plate → relieving difficulties with vibration assistance → recovering the tunneling of the shield machine.
According to the method, water of an adhesive outside the shield tail is evaporated through electric heating to form a block, and then the inclusion and the shield tail shell generate cracks through an impact mechanical resonance effect, so that the purpose of getting rid of difficulties is finally achieved.
The sensitivity of the shield machine to the tunneling related data must be kept all the time in the propelling process, the problem to be generated is judged in advance, analysis must be done, and the problem is solved in the sprouting state. Once the shield body is trapped, the trapping removal measures are actively adopted to complete the trapping removal of the shield machine in the shortest time as much as possible, and the difficulty of the shield machine in the trapping removal is increased along with the extension of the trapping time; the thrust data of the shield tunneling machine in the escaping process is carefully analyzed, the key parts of the shield tunneling machine which is trapped are summarized, the nature of the problem is found, effective countermeasures can be further taken, and the thrust of the shield tunneling machine cannot be increased for escaping the shield tunneling machine.
The electric heating is completed by additionally arranging an electric heating plate on the inner side wall of the shield tail shell of the shield tunneling machine, and the heating temperature of the heating plate must ensure that a shield tail steel plate does not deform.
The method is characterized in that a pendulum type impact device is arranged at the top of the shield tail of the shield tunneling machine, the pendulum type impact device comprises a connecting rope and I-shaped steel or section steel, the I-shaped steel or section steel is suspended at the top of the inner side wall of the shield tail through the connecting rope, and the knocking vibration frequency needs to reach the inherent frequency of a steel plate of the shield tail so as to form a resonance effect.
When heating and vibration auxiliary escaping measures are carried out, the shield tunneling machine trial excavation is synchronously carried out, the thrust is controlled, and the segment damage is prevented.
In the method, corresponding measures are required to reasonably control the posture of the shield tunneling machine in the process of getting rid of difficulties of the shield tunneling machine; if the shield tunneling machine is obviously upward in posture, the upper part of the shield tail is seriously wrapped, and the thrust of an upper oil cylinder is increased at the moment; if the shield tunneling machine is in a downward posture obviously, the lower part of the shield tail is wrapped seriously, and the thrust of the lower oil cylinder is increased at the moment.
In the process of escaping the trouble of the shield tail, because the shield tail is wrapped, in order to ensure that the posture of the shield machine does not change greatly in the process of escaping the trouble, the super-digging cutter is opened in advance to escape the trouble, when the shield tail shield shell and the inclusion generate a gap, and the shield machine has obvious tunneling speed, the super-digging cutter is closed, and the inclusion is scraped by reducing the hole diameter and increasing the frictional resistance.
The shield tail quick-release device is reasonable in design, simple and convenient to operate, low in cost, high in safety coefficient and good in using effect, and can solve the practical problem that the shield tail of a shield machine is wrapped to quickly release from trouble.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of the installation of a heating plate and pendulum impact device in the method of the present invention;
in the figure: 1-the outer side wall of the shield tail; 2-inner side wall of shield tail; 3-electric heating plate; 4-pendulum percussion device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In order to realize safe and quick escaping of the shield tail of the shield tunneling machine, the following steps are required:
the first step is as follows: cleaning the tail of the shield: cleaning impurities on the inner side wall of the shield tail by using sand paper or a sand grinder, and reserving a position where a heating plate is pre-installed;
the second step is that: installing a heating plate: the heating plates are arranged in the range of 180 degrees of the top arch of the inner side wall of the shield tail, the heating plates are arranged at intervals of 1m in the circumferential direction, and the heating plates can be longitudinally and selectively arranged according to the condition. The heating plate adopts an electroplating type heating plate, the rated power is 3KW, the maximum heating temperature can reach 500 ℃, and as the shield tail steel plate adopts Q345B steel, the thickness of the steel plate is about 60mm, and the shield tail needs to be electrified and heated for a long time, so that the outer side wall of the shield tail is heated, and the purpose of water evaporation is achieved. Because the Q345B steel is carbon alloy steel, the steel plate can bear 425 ℃ high-temperature radiation at most according to the specification requirement, when the temperature is higher than 425 ℃, carbide is likely to graphitize, and in order to prevent the tail shield from deforming due to overheating, a temperature measuring gun is required to measure the temperature of the tail shield at any time in the electric heating process, so that the temperature of the tail shield does not exceed 425 ℃ at most;
the third step: vibration-assisted getting rid of poverty: in impact mechanics, a vibrating object has its natural frequency, and when the frequency of an applied exciting force is equal to the natural frequency of the object, a resonance effect can be generated, and at this time, the amplitude of the object can be maximized, and a large energy shock wave can be formed. Based on the principle, in the process that the shield tail is heated, lifting lugs are welded at 1 o 'clock and 11 o' clock of left and right side arch arches on the inner side wall of the shield tail, a chain (or a steel wire rope) is utilized to suspend I-shaped steel (or profile steel) to form an impact pendulum, the tail shield shell is beaten and vibrated by manually holding the 'pendulum', the impact frequency and the impact force are manually controlled, when the vibration of the tail shield shell is obviously enhanced, the vibration amplitude is maximum at the moment to form a resonance effect, and the impact frequency and the force are kept, so that the purpose that cracks are generated between the shield shell and a consolidation body and then the tail shield shell is separated is achieved;
the fourth step: and (3) recovering tunneling of the shield tunneling machine: when heating and vibration auxiliary escaping measures are carried out, trial tunneling of the shield machine can be carried out synchronously, the thrust is increased in stages, and the purpose of loosening the tail shield shell is achieved by repeatedly stretching and retracting the thrust oil cylinder. When thrust is increased for propulsion, the propulsion oil cylinder is easy to damage a rear duct piece, so a steel ring needs to be arranged between the duct piece and the propulsion oil cylinder, stress concentration is reduced, and simultaneously the tightening of a duct piece bolt and the measurement of the duct piece posture are enhanced. When necessary, an external jack is added for assisting propulsion, a support is welded between the duct piece and the middle shield to install the jack under the condition that self thrust of the shield cannot meet the difficulty removal, and the purpose of the difficulty removal is achieved by increasing the total thrust through the external jack.
Of particular note are: the use of the super digger in the shield tail escaping process is characterized in that the shield tail is wrapped, the posture of the shield tunneling machine is difficult to control, the super digger needs to be opened in advance for escaping and tunneling in order to ensure that the posture of the shield tunneling machine does not change greatly in the escaping process, a gap is formed between a shield tail shield shell and an inclusion, when the shield tunneling machine has obvious tunneling speed, the super digger is closed, and the inclusion is scraped by reducing the hole diameter and increasing the friction resistance. If the shield tunneling machine is in a clear upward posture in the escaping process, the upper portion of the shield tail is seriously wrapped, and the thrust of an upper oil cylinder is increased at the moment; if the shield tunneling machine is in a downward posture obviously in the escaping process, the lower part of the shield tail is seriously wrapped, and the thrust of the lower oil cylinder is increased at the moment.
The invention is capable of other embodiments and of being modified locally. The above-described example is only one embodiment of the invention, and not all embodiments. Various modifications, equivalent substitutions, improvements, etc. based on the spirit and substance of the invention may be made by those skilled in the art, and any modifications, equivalents, improvements, etc. within the spirit and principle of the invention should be included in the scope of the invention.
Claims (6)
1. A shield tail wrapping escaping construction method of a shield tunneling machine for tunnel construction is characterized by comprising the following steps: cleaning the shield tail, evaporating water of an adhesive outside the shield tail in an electric heating mode to form a caking, enabling the inclusion and the shield shell of the shield tail to generate a crack through an impact mechanical resonance effect, and finally realizing shield tail package escaping and shield machine recovery tunneling.
2. The shield tail wrapping and escaping construction method of the shield tunneling machine for tunnel construction according to claim 1, characterized in that: an electric heating plate is additionally arranged on the inner side wall of a shield tail shell of the shield tunneling machine, and the shield tail steel plate cannot deform due to the heating temperature of the electric heating plate.
3. The shield tail wrapping and escaping construction method of the shield tunneling machine for tunnel construction according to claim 1, characterized in that: the top of the shield tail of the shield tunneling machine is provided with a pendulum type impact device, the pendulum type impact device comprises a connecting rope and I-shaped steel or section steel, the I-shaped steel or section steel is suspended on the top of the inner side wall of the shield tail through the connecting rope, and the knocking vibration frequency needs to reach the natural frequency of a steel plate of the shield tail so as to form a resonance effect.
4. The shield tail wrapping and escaping construction method of the shield tunneling machine for tunnel construction according to claim 1, characterized in that: when heating and vibration are carried out to assist in getting rid of difficulties, the shield tunneling machine is synchronously tried in, thrust is controlled, and segment damage is prevented.
5. The shield tail wrapping and escaping construction method of the shield tunneling machine for tunnel construction according to claim 1, characterized in that: in the shield tail escaping process, if the posture of the shield tunneling machine is obviously upward, the upper part of the shield tail is seriously wrapped, and the thrust of an upper oil cylinder is increased at the moment; if the shield tunneling machine is in a downward posture obviously, the lower part of the shield tail is wrapped seriously, and the thrust of the lower oil cylinder is increased at the moment.
6. The shield tail wrapping and escaping construction method of the shield tunneling machine for tunnel construction according to claim 1, characterized in that: in the process of getting rid of difficulties of the shield tail, the shield tail is wrapped, in order to ensure that the posture of the shield machine does not change greatly in the process of getting rid of difficulties, the super-digging cutter is opened in advance to get rid of difficulties for tunneling, when the shield tail shield shell and the wrapped body generate a gap, and the shield machine has obvious tunneling speed, the super-digging cutter is closed, and the wrapped body is scraped by reducing the hole diameter and increasing the friction resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010365845.6A CN111594189B (en) | 2020-04-30 | 2020-04-30 | Shield tail wrapping and escaping construction method of shield tunneling machine for tunnel construction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010365845.6A CN111594189B (en) | 2020-04-30 | 2020-04-30 | Shield tail wrapping and escaping construction method of shield tunneling machine for tunnel construction |
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| Publication Number | Publication Date |
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| CN111594189A CN111594189A (en) | 2020-08-28 |
| CN111594189B true CN111594189B (en) | 2022-07-05 |
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| CN111980717B (en) * | 2020-08-31 | 2022-03-22 | 中铁一局集团有限公司 | Method for processing shield shell grouting wrappage of shield tunneling machine |
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