CN103235110B - Freezing reinforcement simulation test method and freezing reinforcement simulation test device suitable for shield ground butt joint - Google Patents
Freezing reinforcement simulation test method and freezing reinforcement simulation test device suitable for shield ground butt joint Download PDFInfo
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- CN103235110B CN103235110B CN201310185114.3A CN201310185114A CN103235110B CN 103235110 B CN103235110 B CN 103235110B CN 201310185114 A CN201310185114 A CN 201310185114A CN 103235110 B CN103235110 B CN 103235110B
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Abstract
The invention discloses a freezing reinforcement simulation test method suitable for shield ground butt joint. According to the method, a first shield tunneling machine model and a second shield tunneling machine model are arranged, and the method comprises the following steps of: (1) excavating a frozen earth test box underground; (2) respectively arranging a plurality of freezing pipes on shells of the two shield tunneling machine models; (3) respectively arranging a plurality of strain rosettes on the inner surfaces and the outer surfaces of the shells of the two shield tunneling machine models; (4) respectively welding at least one reinforcing steel bar on the shells of the two shield tunneling machine models, and arranging a soil mass pressure box and a temperature sensor on the reinforcing steel bar; (5) filling soil into the frozen earth test box, and carrying out soil consolidation; (6) connecting all the freezing pipes into a freezing pipeline by a freezing device; and (7) starting to freeze and acquiring and analyzing the data. The freezing reinforcement simulation test method is suitable for the freezing method construction simulation test of the shield ground butt joint, can be used for simulating the process of shield ground butt joint freezing method construction, and saves fund, manpower and time compared with the test using physical prototype.
Description
Technical field
The present invention about a kind of test method, refer in particular to a kind of be applicable to dock in shield structure ground consolidation by freezing simulation experiment method and device.
Background technology
The construction method of subway tunnel mainly comprises shield method, cut and cover method, Mining Method etc.Wherein, shield method is the rigid protection relying on shield structure self in a kind of work progress, is constantly utilizing cutterhead to excavate the soil body, and is carrying out the method for tunnel construction of pipe sheet assembling and grouting behind shaft or drift lining at shield structure afterbody.Due to shield method have that mechanization degree is high, speed of application is fast and to advantages such as surrounding environment disturbance are little, therefore become metro construction and adopted more construction method.
At home in shield structure engineering in the past, every bar tunnel uses a shield machine driving mostly, carries out the dismounting Sum decomposition of shield machine in received well.But some engineering for various reasons, once can not arrive shield structure received well, at this moment will adopt docking technique in shield structure ground.
Current domestic shield structure tunnels in opposite directions, it is little to utilize jointed underground technology to build the case history in tunnel, relative to through driving face, dock construction in shield structure ground and need the large difficulties of solution two, one is the control of merging precision, first to ensure that tunnel through error meets code requirement, secondly ensure to dock relative error, to ensure that two shield structure shells carry out twin weld smoothly in opposite directions in shield structure ground; Two is the stability in mating operation face, with the safety guaranteeing that in hole, shield structure disintegrates.Use freezing consolidation joint, can ensure that joint interface is closed, freezing curtain can resist extraneous Water And Earth Pressures and seepage, ensures the safety of docking construction.
Due to dock in shield structure ground job design can the case of reference little, the influence factor in shield structure ground involved by butt joint project is also very complicated, and adopting the mode of theoretical analysis or numerical simulation to study docking technique in shield structure ground has certain limitation.
Summary of the invention
Because the problems referred to above, the invention provides a kind of consolidation by freezing simulation experiment method being applicable to dock in shield structure ground, comprise one first shield machine model and one second shield machine model, and comprise the following steps:
(1) in underground with a certain distance from the position of adjacent building ground, excavate a frozen soil test chamber, in described first shield machine model and described second shield machine model being covered;
(2) a plurality of freezing pipe is set on the housing of described first shield machine model and described second shield machine model;
(3) in the shell inner surface and outside surface of described first shield machine model and described second shield machine model, a plurality of strain rosette is arranged;
(4) each welding at least one reinforcing bar on the housing of described first shield machine model and described second shield machine model, and on described reinforcing bar, arrange a soil pressure box and a temperature sensor;
(5) banket in described frozen soil test chamber, and make soil solidifying;
(6) by a freezing plant, each described freezing pipe is connected into one and freeze pipeline;
(7) start to freeze, and carry out data collection and analysis.
Further, after step (2), also comprise step: the hydraulic testing is carried out to described freezing pipe, test pressure in 0.3MPa situation, the pressure drop after half an hour.
Further, in step (3), also step is comprised: within the scope of the test position 5cm of the described strain rosette in the shell inner surface of described first shield machine model and described second shield machine model, arrange strainometer, to check the test effect of described strain rosette
Further, in step (5), in process of banketing, every 20cm to 40cm ramming machine is tamped, and after banketing, makes native consolidation 0.5 to 1.5 month.
Further, in step (6), described freezing plant comprises a brine tank and a plurality of brine pump, and by a plurality of for liquid back pipe road described brine tank, described brine pump and each described freezing pipe to be connected into described in freeze pipeline.
Further, described freezing pipe is provided with valve.
Further, in step (7) a metallic, also comprise step: use blower fan forced draft, the temperature variations of each measuring point on the housing observing described first shield machine model and described second shield machine model, and carry out data collection and analysis.
Present invention also offers a kind of consolidation by freezing simulation test device being applicable to dock in shield structure ground, comprise one first shield machine model and one second shield machine model, and:
One frozen soil test chamber, in covering described first shield machine model and described second shield machine model;
A plurality of freezing pipe, is arranged on the housing of described first shield machine model and described second shield machine model;
A plurality of strain rosette, on the shell inner surface being arranged at described first shield machine model and described second shield machine model and outside surface;
At least one reinforcing bar, is welded on the housing of described first shield machine model and described second shield machine model, and on described reinforcing bar, is furnished with a soil pressure box and a temperature sensor;
One freezing plant, connects into one by each described freezing pipe and freezes pipeline.
Further, described soil pressure box is type vibration wire soil pressure box, and described temperature sensor is copper-constantan thermocouple, and
Also strainometer is furnished with within the scope of the test position 5cm of the described strain rosette in the shell inner surface of described first shield machine model and described second shield machine model.
Further, described freezing plant comprises a brine tank and a plurality of brine pump, and by a plurality of for liquid back pipe road described brine tank, described brine pump and each described freezing pipe to be connected into described in freeze pipeline, and valve is set on described freezing pipe.
The present invention is applicable to the consolidation by freezing simulation experiment method docked in shield structure ground, adopts the method for physical simulation experiment, is a kind of scientific experimentation research method solving production and engineering problem.It is based on similarity theory, similarity criterion is derived by orthodox regression or equation analysis transformation approach, physical simulation experiment is arranged again according to similarity criterion, the value of each physical quantity is obtained by test, according to similarity criterion the value of this physical quantity calculated to again and prototype is gone, thus obtain each Parameter Variation of prototype, be that a kind of advantages mathematical analysis method and test method(s) is got up thus effectively solves the scientific research methods of production and engineering problem, docking technique in shield structure ground can be studied preferably.
The present invention is applicable to the consolidation by freezing simulation experiment method docked in shield structure ground, be applicable to the construction freezing method simulation test of docking in shield structure ground, can simulate in shield structure ground and dock construction freezing method process, theoretical analysis and numerical simulation are difficult to the complicated factor considered, can consider that it is on the impact of docking in shield structure ground preferably, important predicting function is had to docking work progress in shield structure ground, compare prototype test in kind, fund, manpower and time being saved, having important directive significance for docking construction freezing method in shield structure ground.
Accompanying drawing explanation
Fig. 1 is the process flow diagram that the present invention is applicable to the consolidation by freezing simulation experiment method docked in shield structure ground.
Fig. 2 is the structural representation that the present invention is applicable to the consolidation by freezing simulation test device docked in shield structure ground.
Embodiment
Coordinate referring to shown in Fig. 1, it is the process flow diagram that the present invention is applicable to the consolidation by freezing simulation experiment method docked in shield structure ground, coordinate referring to shown in Fig. 2, according to similarity theory in test, select geometry contracting to dock in ground with one second shield machine model 6 than the one first shield machine model 5 being 6.35, comprise the following steps:
S1 is in underground excavation one frozen soil test chamber.
In underground with a certain distance from the position of adjacent building ground, excavate a frozen soil test chamber 4, avoid causing unsafe factor to adjacent building, in described first shield machine model 5 and described second shield machine model 6 are covered.
S2 arranges a plurality of freezing pipe on the housing of two shield machine models.
The housing of described first shield machine model 5 and described second shield machine model 6 arranges a plurality of freezing pipe 7, and the hydraulic testing is carried out to described freezing pipe 7, test pressure is in 0.3MPa situation, pressure drop after half an hour, pressure drop is no more than 0.03MPa, can be qualified, has the weld seam of infiltration should mending-leakage in time, ensure the unimpeded of freezing pipe 7, avoid blocking.
S3 arranges a plurality of strain rosette on the inside surface and outside surface of the housing of two shield machine models.
The shell inner surface and outside surface of described first shield machine model 5 and described second shield machine model 6 arrange a plurality of strain rosette, and arrange strainometer within the scope of the test position 5cm of described strain rosette in the shell inner surface of described first shield machine model 5 and described second shield machine model 6, to check the test effect of described strain rosette, test the dependent variable that in work progress, shield machine model diverse location produces simultaneously.
S4 is each welding at least one reinforcing bar on the housing of two shield machine models, and on reinforcing bar, arrange soil pressure box and temperature sensor.
The housing of described first shield machine model 5 and described second shield machine model 6 welds at least one reinforcing bar 9, described reinforcing bar 9 is arranged soil pressure box 11 and a temperature sensor 10, wherein, the quantity of described reinforcing bar 9, angle and length are determined according to the layout of the temperature sensor 10 that will lay and soil pressure box 11, described soil pressure box 11 is type vibration wire soil pressure box, and described temperature sensor 10 is copper-constantan thermocouple.
S5 bankets in frozen soil test chamber, and makes soil solidifying.
Be equipped with the experiment soil of certain water percentage on request, banket according to projected depth in described frozen soil test chamber 4, in process of banketing, every 20cm to 40cm ramming machine is tamped, and after banketing, makes native consolidation 0.5 to 1.5 month.
Each freezing pipe is connected into one by a freezing plant and freezes pipeline by S6.
Described freezing plant comprises a brine tank 1 and a plurality of brine pump 2, by a plurality of for liquid back pipe road 3 described brine tank 1, described brine pump 2 and each described freezing pipe 7 to be connected into described in freeze pipeline, guarantee is freezed pipeline and is moved towards smooth and easy, and on the loop of each freezing pipe 7 mounted valve 8.
S7 starts to freeze, and carries out data collection and analysis.
Start to freeze, before freezing to start, first guarantee the normal operation of various sensor, guarantee and the Electrical Safety of other various testing equipments, acquisition system trial run gathers primary data, experimental system idle running trial run, formally starts freezing test during no problem, carries out data acquisition simultaneously.Further, use blower fan forced draft, observe in frozen soil, the temperature variations of each measuring point on the housing of described first shield machine model 5 and described second shield machine model 6, explore the impact of ventilating on frozen temperature field.
Coordinate referring to shown in Fig. 2, present invention also offers a kind of consolidation by freezing simulation test device being applicable to dock in shield structure ground, comprise described first shield machine model 5 and described second shield machine model 6, and:
One frozen soil test chamber 4, in covering described first shield machine model 5 and described second shield machine model 6;
A plurality of freezing pipe 7, is arranged on the housing of described first shield machine model 5 and described second shield machine model 6;
A plurality of strain rosette, on the shell inner surface being arranged at described first shield machine model 5 and described second shield machine model 6 and outside surface, and arrange strainometer within the scope of the test position 5cm of described strain rosette in the shell inner surface of described first shield machine model 5 and described second shield machine model 6;
At least one reinforcing bar 9, is welded on the housing of described first shield machine model 5 and described second shield machine model 6, and arranges described soil pressure box 11 and described temperature sensor 10 on described reinforcing bar 9.Wherein, described soil pressure box 11 is type vibration wire soil pressure box, and described temperature sensor 10 is copper-constantan thermocouple;
One freezing plant, comprises a brine tank 1 and a plurality of brine pump 2, by a plurality of for liquid back pipe road 3 described brine tank 1, described brine pump 2 and each described freezing pipe 7 to be connected into described in freeze pipeline, and valve 8 is set on described freezing pipe 7.
The above is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, not departing from the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (9)
1. be applicable to the consolidation by freezing simulation experiment method docked in shield structure ground, it is characterized in that comprising one first shield machine model and one second shield machine model, and comprise the following steps:
(1) in underground with a certain distance from the position of adjacent building ground, excavate a frozen soil test chamber, in described first shield machine model and described second shield machine model being covered;
(2) several freezing pipe is set on the housing of described first shield machine model and described second shield machine model, the hydraulic testing is carried out to described freezing pipe, test pressure in 0.3MPa situation, the pressure drop after half an hour;
(3) in the shell inner surface and outside surface of described first shield machine model and described second shield machine model, several strain rosette is arranged;
(4) each welding at least one reinforcing bar on the housing of described first shield machine model and described second shield machine model, and on described reinforcing bar, arrange a soil pressure box and a temperature sensor;
(5) banket in described frozen soil test chamber, and make soil solidifying;
(6) by a freezing plant, each described freezing pipe is connected into one and freeze pipeline;
(7) start to freeze, and carry out data collection and analysis.
2. be applicable to the consolidation by freezing simulation experiment method docked in shield structure ground as claimed in claim 1, it is characterized in that, in step (3), also comprise step: arrange verification strainometer within the scope of the test position 5cm of the described strain rosette in the shell inner surface of described first shield machine model and described second shield machine model, to check the test effect of described strain rosette.
3. be applicable to the consolidation by freezing simulation experiment method docked in shield structure ground as claimed in claim 1, it is characterized in that, in step (5), in process of banketing, every 20cm to 40cm ramming machine is tamped, after banketing, make native consolidation 0.5 to 1.5 month.
4. be applicable to the consolidation by freezing simulation experiment method docked in shield structure ground as claimed in claim 1, it is characterized in that, in step (6), described freezing plant comprises a brine tank and brine pump, and freezes pipeline described in described brine tank, described brine pump and each described freezing pipe being connected into for liquid back pipe road.
5. the consolidation by freezing simulation experiment method of with the being applicable to shield structure middle docking as described in claim 1 or 4, is characterized in that described freezing pipe is provided with valve.
6. be applicable to the consolidation by freezing simulation experiment method docked in shield structure ground as claimed in claim 1, it is characterized in that, in step (7), also comprise step: use blower fan forced draft, the temperature variations of each measuring point on the housing observing described first shield machine model and described second shield machine model, and carry out data collection and analysis.
7. be applicable to the consolidation by freezing simulation test device docked in shield structure ground, it is characterized in that comprising one first shield machine model and one second shield machine model, and:
Excavate the frozen soil test chamber with a certain distance from adjacent building ground position in underground, in described first shield machine model and described second shield machine model being covered;
Several freezing pipe, is arranged on the housing of described first shield machine model and described second shield machine model;
Several strain rosette, on the shell inner surface being arranged at described first shield machine model and described second shield machine model and outside surface;
At least one reinforcing bar, is welded on the housing of described first shield machine model and described second shield machine model, and on described reinforcing bar, is furnished with a soil pressure box and a temperature sensor;
One freezing plant, connects into one by each described freezing pipe and freezes pipeline.
8. be applicable to the consolidation by freezing simulation test device docked in shield structure ground as claimed in claim 7, it is characterized in that:
Described soil pressure box is type vibration wire soil pressure box, and described temperature sensor is copper-constantan thermocouple, and
Verification strainometer is also furnished with within the scope of the test position 5cm of the described strain rosette in the shell inner surface of described first shield machine model and described second shield machine model.
9. be applicable to the consolidation by freezing simulation test device docked in shield structure ground as claimed in claim 7, it is characterized in that described freezing plant comprises a brine tank and brine pump, and freeze pipeline described in described brine tank, described brine pump and each described freezing pipe being connected into for liquid back pipe road, and valve is set on described freezing pipe.
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| CN201310185114.3A CN103235110B (en) | 2013-05-17 | 2013-05-17 | Freezing reinforcement simulation test method and freezing reinforcement simulation test device suitable for shield ground butt joint |
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| CN201310185114.3A CN103235110B (en) | 2013-05-17 | 2013-05-17 | Freezing reinforcement simulation test method and freezing reinforcement simulation test device suitable for shield ground butt joint |
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| CN103235110B true CN103235110B (en) | 2015-05-20 |
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| CN104316337B (en) * | 2014-09-26 | 2016-11-23 | 浙江工业大学 | A kind of shield machine performance testing device |
| CN104316671B (en) * | 2014-10-10 | 2016-05-18 | 同济大学 | A kind of experimental rig that measures artificial freeze thawing soil frost-heave force and frost heaving amount |
| CN107328861A (en) * | 2017-08-11 | 2017-11-07 | 江苏省宏源电力建设监理有限公司 | A kind of multi-functional physical parameter change modeling device in shield launching termination |
| CN108915710A (en) * | 2018-06-28 | 2018-11-30 | 广东华隧建设集团股份有限公司 | A kind of shield machine opens a position acceptance method |
| CN109505610B (en) * | 2018-12-25 | 2023-10-20 | 武汉市市政建设集团有限公司 | Simulation system and method for influence of subway station bottom freezing construction on station structure |
| CN113468630B (en) * | 2021-05-13 | 2023-08-25 | 海南大学 | Optimization method for shield tunnel originating end reinforcing scheme |
| CN113310849B (en) * | 2021-05-13 | 2023-03-24 | 华侨大学 | Grouting reinforcement test device and method for simulating shield underground butt joint |
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Effective date of registration: 20151209 Address after: 200232 Shanghai city Xuhui District Wanping Road No. 1099 5 floor Patentee after: Shanghai Tunnel Engineering Co., Ltd. Patentee after: Shanghai Tunnel Engineering Co., Ltd. Patentee after: China University of Mining & Technology Address before: 200082 No. 118, Dalian Road, Shanghai, Yangpu District Patentee before: Shanghai Tunnel Engineering Co., Ltd. Patentee before: China University of Mining & Technology |