CN110017931A - A kind of outer lateral earth pressure measuring device of shield tunnel - Google Patents
A kind of outer lateral earth pressure measuring device of shield tunnel Download PDFInfo
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- CN110017931A CN110017931A CN201910240130.5A CN201910240130A CN110017931A CN 110017931 A CN110017931 A CN 110017931A CN 201910240130 A CN201910240130 A CN 201910240130A CN 110017931 A CN110017931 A CN 110017931A
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- piston
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- screw thread
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
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- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The present invention relates to lateral earth pressure measuring devices outside a kind of shield tunnel, including oil sac, silica gel O-ring seal, hydro-expansive rubber sleeve, cylinder barrel, piston, the wirerope for drawing piston, for installation piston install support member, electric-control system, oil supply unit, wherein, the oil sac engages by screw thread between cylinder barrel and compresses the sealing that silica gel O-ring seal realizes hydraulic oil to experience soil deformation and transmitting soil pressure；The lower part of cylinder barrel is provided with external screw thread and internal screw thread, and external screw thread matches with lifting injected hole internal screw thread, and internal screw thread is connected with piston installation support member；Cylinder barrel upper position is provided with the tongue for fixed piston, and cylinder barrel bottom and top hand of spiral is on the contrary, cylinder barrel bottom thread is identical as lifting injected hole internal screw thread direction；Piston is located in cylinder barrel, including piston "upper" part, formulation are to silk, heating rod, pressure liquid level set temperature transmitter, petroleum pipeline, exhaust pipe and piston "lower" part.
Description
Technical field
The invention belongs to geotechnical engineering the field of test technology, are related to a kind of outer lateral earth pressure measuring device of shield tunnel.
Background technique
The continuous propulsion of modernization of the country process, it is desirable that city accommodates enough urban populations, urban infrastructure
It builds and improves and ensure that expressway around city operating and employment capacity.The planning and development of urban track traffic cause a large amount of subway tunnels
Road needs are built, and wherein shield construction has fast speed of application, high degree of automation, effect on environment small, industry and technology
Many advantages, such as mature is the prefered method of subway tunnel construction.Shield tunnel be it is assembled by lining segment and joint structure and
At liner structure is directly or indirectly contacted with the soil body by grouting layer, therefore outer lateral earth pressure directly affects the interior of structure
The deformation of power and connector, and then affect durability and waterproof performance in structure normal use.From the complete of tunnel construction project
The angle of life cycle accounts for, and the accurate monitoring of soil pressure is the feasibility of tunnel construction, the reasonability of structure design, applies
The important leverage of maintenance and reinforcing after the safety of work and operation, tunnel arrival design life.
Currently, the monitoring of soil pressure is mainly using the method for prefabricated test section of jurisdiction, this method is to bury in lining segment
Soil pressure cell and holding soil pressure cell outer membrane and section of jurisdiction extrados flush, test section of jurisdiction should carry out again as structure member
Tunnel outer surface pressure monitoring, but had the disadvantage that using this method monitoring soil pressure
1. being influenced by measured medium rigidity
When measured medium rigidity is smaller, medium will not restrict the deformation response of the outer membrane of soil pressure cell, with ideal by
Power condition is wanted to approach, and the stress in real medium can all be incuded by soil pressure cell；When measured medium rigidity is larger, medium
Self-bearing capacity high deformation it is small, the deformation for constraining soil pressure cell is corresponding, while the presence of soil pressure cell side wall exacerbates
This influence, therefore the stress in medium can not be all sensed, measured stress is less than the actual stress in medium.
2. being influenced by soil pressure cell size
In order to guarantee that soil pressure cell can adapt to severe and complicated test environment, therefore made using the thicker steel shell of side wall
For the shell of soil pressure cell, its overall stiffness and stability are improved.The thickness of the bigger steel shell of the range of soil pressure cell is bigger, actual measurement
Value differs bigger with actual value.Soil pressure passes to corresponding sensing element by acting on soil pressure cell outer membrane, because furthermore
The area of film can also have an impact measured value, and the area of outer membrane is got over large deformation and is more obvious, and measured value is close with actual value.
3. being buried state by soil pressure cell is influenced
Soil pressure cell is embedded in prefabricated pipe section, as the manufacturing process common experience of prefabricated pipe section conserves the stage, leads to soil
The outer film pressure of pressure cell is unevenly distributed and then causes measurement error；Prefabricated test section of jurisdiction is in construction and installation to abjection shield tail and the soil body
In contact process, it not can guarantee soil pressure cell outer membrane and contacted well with the test soil body.
4. being influenced by sensor oneself factor
Soil pressure cell is bigger by such environmental effects, requires air humidity less than 80%, non-corrosive gas indoors
It under body and ventilation condition, requires when carrying to handle with care, soil pressure cell needs not used for 1 year re-start calibration；?
In test process, the zero point of soil pressure cell can drift about with the time, therefore not be suitable for the long term monitoring of soil pressure.
In view of the above problems, developing a kind of shield that can overcome environmental factor, installation factor and sensor oneself factor
The outer lateral earth pressure measuring device of tunnel duct piece and method, to the measurement accuracy Practical valence with higher for improving soil pressure
Value.
Summary of the invention
The object of the present invention is to provide lateral earth pressure measuring devices outside a kind of shield tunnel, and lifting injected hole by section of jurisdiction will
It realizes and is contacted with the extraneous soil body, the constant temperature shape of hydraulic oil is ensured by the temperature control system in Monitoring on Earth Pressure device
State realizes the long term monitoring to lateral earth pressure outside tunnel eventually by the oil pressure in measurement constant temperature oil sac.In order to realize appeal mesh
, The technical solution adopted by the invention is as follows:
A kind of outer lateral earth pressure measuring device of shield tunnel, including oil sac 1, silica gel O-ring seal 7, hydro-expansive rubber
Sleeve 5, cylinder barrel 4, piston, piston installation support member 8, electric-control system, oil supply unit for installation, wherein
The oil sac 1 is engaged and is pressed by screw thread between cylinder barrel 4 to experience soil deformation and transmitting soil pressure
Tight silica gel O-ring seal 7 realizes the sealing of hydraulic oil；
The lower part of cylinder barrel 4 is provided with external screw thread and internal screw thread, and external screw thread matches with lifting injected hole internal screw thread, internal screw thread
To be connected with piston installation support member 8；4 upper position of cylinder barrel is provided with the tongue 401 for fixed piston, cylinder barrel 4
Bottom and top hand of spiral is on the contrary, 4 bottom thread of cylinder barrel is identical as lifting injected hole internal screw thread direction；
Hydro-expansive rubber sleeve 5 is wrapped in the outside of cylinder barrel 4, and the lifting injected hole penetrated to prevent water from passing through flows into
Inside shield tunnel；
Piston is located in cylinder barrel 4, including piston "upper" part 2, formulation are to silk 3, heating rod 301, pressure liquid level set temperature
Spend transmitter 302, petroleum pipeline 303, exhaust pipe 304 and piston "lower" part 6；The end of piston "upper" part 2 is provided with and oil
The side wall of the pointed plug that 1 inner wall of capsule is bonded to each other, piston "upper" part 2 is provided with hole 201, to realize hydraulic oil to oil sac
Transmitting, piston "upper" part 2 and piston "lower" part 6 carry out screw thread engagement connection to silk 3 by formulating；In customization to silk 3
On offer multiple threaded holes, customization to silk 3 by threaded hole respectively with petroleum pipeline 303, exhaust pipe 304, pressure liquid level set
Temperature transmitter 302, heating rod 301 connect, and customization is provided with O-ring seal to silk 3 and 6 threaded connection place of piston "lower" part
To guarantee the sealing row inside oil cylinder；Reciprocating dynamic sealing, piston "lower" part 6 are formed between piston "lower" part 6 and cylinder barrel 4
Outside is provided with the groove 601 that the rubber tongue 401 of cylinder barrel 4 matches, and the bottom of piston "lower" part 6 and piston installation support
Component 8 is connected.
Preferably, the bottom of piston "lower" part 6 is equipped with the string holes for being used to the wirerope across traction piston；Draw piston
The wirerope tongue 401 that is caught in stainless steel cylinder barrel 4 to draw piston.
Detailed description of the invention
Fig. 1 is soil pressure force measuring device scheme of installation
Fig. 2 is soil pressure force measuring device operation schematic diagram
Fig. 3 is piston "upper" partial schematic diagram
Fig. 4 be piston " in " partial schematic diagram
Fig. 5 is piston "lower" partial schematic diagram
Fig. 6 is circuit diagram of the invention
Include in Fig. 1~5:
1-TPU oil sac；2- piston "upper" part；3- is formulated to silk；301- heating rod；302- pressure liquid level set temperature becomes
Send device；303- petroleum pipeline；304- exhaust pipe；4- stainless steel cylinder barrel；401- rubber tongue；5- hydro-expansive rubber sleeve；6- is living
Fill in "lower" part；601- fixes position groove；602- guide ring；603- Glais ring；604- draws string holes；7- seal O-ring；8-
Piston installs support member；9- soil pressure force measuring device installs support member
Specific embodiment
Technical solution of the present invention is described in detail below in conjunction with specific embodiments and the drawings, but it is of the invention
Protection scope be not limited to the following embodiments.
Now in conjunction with above-mentioned each attached drawing, the case study on implementation of lateral earth pressure measuring device outside tunnel is proposed.
As shown in Figure 1, the outer lateral earth pressure measuring device of shield tunnel of the present invention comprising TPU oil sac 1, piston "upper" portion
Divide 2, formulate to silk 3, heating rod 301, pressure liquid level set temperature transmitter 302, petroleum pipeline 303, exhaust pipe 304, stainless steel
Cylinder barrel 4, hydro-expansive rubber sleeve 5, piston "lower" part 6, silica gel O-ring seal 7, piston install support member 8, soil pressure
Measuring device installs support member 9.
1 major function of TPU oil sac is to experience soil deformation and transmitting soil pressure, the characteristics of simultaneously with insulation,
Different capabilities size can be customized according to boring requirement.
4 outer surface of stainless steel cylinder barrel puts on the waterproof performance that hydro-expansive rubber sleeve 5 guarantees lifting injected hole, TPU oil
Capsule 1 engages connection by screw thread with stainless steel cylinder barrel 4, while real in the silica gel O-ring seal 703 and 705 setting up and down of screw thread
The sealing of existing hydraulic oil.
Fig. 3-Fig. 5 be piston "upper", " in ", "lower" three parts schematic diagram, piston "upper" part 2 guarantee TPU oil sac 1 exist
Shape in the measurement soil body realizes the equivalence replacement of soil with hydraulic oil, keeps the soil pressure measured truer.Piston "upper" portion
2 side wall providing holes 201 is divided to realize transmitting of the hydraulic oil to oil sac；Piston " in " 3 pairs of part silk four threaded holes of setting, respectively
Are as follows: with the matched threaded hole 3011 of heating rod 301, with the matched threaded hole 3021 of pressure liquid level set temperature transmitter 302, with
The upper and lower position of the matched threaded hole 3031 of petroleum pipeline 303 and the matched threaded hole 3041 of exhaust pipe, each screw thread is installed by matching
Silica gel O-ring seal；Guide ring 602 is set on the outside of piston "lower" part 6 and Glais ring 603 realizes reciprocating dynamic sealing, it is close
Bottom is arranged fixed position groove 601 and matches with 401 size of rubber tongue, and four traction string holes 604 and piston peace are arranged in bottom
Fill 8 matched top position card slot 605 of support member.
Piston "upper", " in ", engaged between the three parts of "lower" and connect by screw thread, place silica gel in the upper and lower position of screw thread
The sealing of O-ring seal guarantee hydraulic oil.TPU oil sac 1, piston and stainless steel cylinder barrel 4 have collectively constituted hydraulic oil seal chamber.
Lateral earth pressure measuring device is packed into before the lifting injected hole drilled through in advance outside shield tunnel, by petroleum pipeline 303
It is connect with oil supply unit, the soil pressure force measuring device fuel feeding into oil pocket straight down is kept, until exhaust pipe 304 has hydraulic oil row
Guarantee that, without air in oil pocket, sealing exhaust pipe 304 installs piston support member 8 out.Lateral earth pressure outside shield tunnel is measured
The device installation such as lifting injected hole drilled through in advance, carries out position locking using soil pressure force measuring device installation support member 9, prevents
Only soil pressure force measuring device follows piston support member 8 to move jointly when dismantling.
Fig. 2 is that soil pressure force measuring device operation schematic diagram is installed state, locks soil pressure force measuring device in component 9
After fixed, piston support member 8 is dismantled, starting oil supply unit injects the hydraulic oil volume of calibration into oil pocket, while pulling and leading
Messenger keeps piston mobile to oiling opposite direction, and the final card of rubber groove 401 such as fixed 601 fixed piston position of position groove guarantees
Oil pressure in oil pocket is equal with soil pressure.Petroleum pipeline 303 is sealed after the completion of oiling, removes soil pressure force measuring device and support portion is installed
Part 9.The wiring position of heating rod 301 and pressure liquid level set temperature transmitter 302 can be placed in lifting injected hole, and
It is filled, is saved in addition to the equipment of peripheral hardware terminal box and the space of needs using epoxy resin.
Fig. 6 is circuit diagram of the invention, which includes two parts of temperature-control circuit and oil pressure measuring circuit,
When measured temperature signal and fuel injection pressure signal are transferred to PC or PLC, first by the standard temperature of obtained temperature and setting
Degree is compared judgement, exports measured pressure if measurement temperature is met the requirements；If measurement temperature be unsatisfactory for requiring, PC or
The working condition that person PLC then controls heating rod 301 carries out hydraulic fluid temperature adjustment in oil pocket, keeps temperature constant, guarantees monitoring
Soil pressure it is equal with oil pressure, improve the levels of precision of measurement.
The outer lateral earth pressure measurement method of shield tunnel, specifically includes following steps:
Step 1, assembling measuring device and piston installation support member 8, will to guarantee to be bonded between piston and TPU oil sac 1
Petroleum pipeline 303 is attached with oil supply unit, opens the exhaust pipe 304 of measuring device and by the measuring device TPU oil after assembling
Capsule 1 straight down, by measuring device pumps hydraulic oil until there is hydraulic oil outflow in exhaust pipe 304, measuring device oil pocket at this time
Interior to be filled by hydraulic oil there is no air, sealing exhaust pipe 304 simultaneously closes off oil valves.
Step 2 drills through lifting injected hole using air drill in shield tunnel and exceeds lining cutting outer surface 200mm, guarantees to bore
Bore dia is greater than 1 1~2mm of diameter of TPU oil sac.
Step 3 engages connection by the screw thread between piston installation support member 8 and measuring device, is pulled using interior hexagonal
Measuring device is screwed to bottom in lifting injected hole by hand.Soil pressure force measuring device installation support member 9 is revolved using monkey wrench
It is screwed into lifting injected hole, and contacts the purpose for playing locking measuring device with measuring device.
Step 4, unloading piston installation support member 8 open simultaneously oil valves, monitor the flowmeter above oil pump, work as note
Enter to stop immediately when The hydraulic oil reaches TPU 1 marked capacity of oil sac oiling and close oil valves, seals petroleum pipeline 303.
Soil pressure force measuring device installation support member 9 is screwed out, connection by step 5 from lifting injected hole using spanner
The conducting wire of good heating rod 301, pressure liquid level set temperature transmitter 302, and terminal is placed on the surplus of lifting injected hole
In complementary space, pour using epoxy resin and realize that lifting injected hole finally seals.
Step 6, PC or PLC are compared by the temperature measured multiplied by temperature coefficient and default hydraulic oil oil temperature, are controlled
Heating tube working condition processed, when temperature is lower than preset temperature, heating hydraulic oil makes it keep temperature constant state.Pass through PC or PLC
It sets hydraulic fluid pressure, that is, measuring point soil pressure detection frequency and stores data.
Claims (2)
1. a kind of outer lateral earth pressure measuring device of shield tunnel, including oil sac (1), silica gel O-ring seal (7), water-swellable rubber
Rubber sleeve (5), cylinder barrel (4), piston, piston installation support member (8), electric-control system, oil supply unit for installation, wherein
The oil sac (1) is engaged and is pressed by screw thread between cylinder barrel (4) to experience soil deformation and transmitting soil pressure
Tight silica gel O-ring seal (7) realizes the sealing of hydraulic oil；
The lower part of cylinder barrel (4) is provided with external screw thread and internal screw thread, and external screw thread matches with lifting injected hole internal screw thread, and internal screw thread is used
To be connected with piston installation support member (8)；Cylinder barrel (4) upper position is provided with the tongue (401) for fixed piston, cylinder
Cylinder (4) bottom and top hand of spiral is on the contrary, cylinder barrel (4) bottom thread is identical as lifting injected hole internal screw thread direction；
Hydro-expansive rubber sleeve (5) is wrapped in the outside of cylinder barrel (4), and the lifting injected hole penetrated to prevent water from passing through flows into
Inside shield tunnel；
Piston is located in cylinder barrel (4), including piston "upper" part (2), formulation are to silk (3), heating rod (301), pressure liquid level collection
Close temperature transmitter (302), petroleum pipeline (303), exhaust pipe (304) and piston "lower" part (6)；Piston "upper" part (2)
End is provided with the pointed plug being bonded to each other with oil sac (1) inner wall, and the side wall of piston "upper" part (2) is provided with hole (201),
To realize transmitting of the hydraulic oil to oil sac, piston "upper" part (2) and piston "lower" part (6) by formulate to silk (3) into
The engagement connection of row screw thread；In customization to offering multiple threaded holes on silk (3), customization to silk (3) by threaded hole respectively with it is defeated
Oil pipe (303), exhaust pipe (304), pressure liquid level set temperature transmitter (302), heating rod (301) connection, customize to silk (3)
O-ring seal is provided with piston "lower" part (6) threaded connection place to guarantee the sealing row inside oil cylinder；Piston "lower" part
(6) reciprocating dynamic sealing is formed between cylinder barrel (4), and the rubber tongue of cylinder barrel (4) is provided on the outside of piston "lower" part (6)
(401) bottom of the groove (601) to match, piston "lower" part (6) is connected with piston installation support member (8).
2. measurement method according to claim 1, which is characterized in that the bottom of piston "lower" part (6), which is equipped with, to be used to wear
Cross the string holes of the wirerope of traction piston；The tongue that the wirerope of traction piston is caught in stainless steel cylinder barrel (4) to draw piston
(401)。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910240130.5A CN110017931B (en) | 2019-03-28 | 2019-03-28 | Shield tunnel outside soil pressure measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910240130.5A CN110017931B (en) | 2019-03-28 | 2019-03-28 | Shield tunnel outside soil pressure measuring device |
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| CN110017931A true CN110017931A (en) | 2019-07-16 |
| CN110017931B CN110017931B (en) | 2021-04-13 |
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| CN201910240130.5A Active CN110017931B (en) | 2019-03-28 | 2019-03-28 | Shield tunnel outside soil pressure measuring device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111076848A (en) * | 2019-12-27 | 2020-04-28 | 天津大学 | Pressure measuring device and method |
| CN113340475A (en) * | 2021-05-20 | 2021-09-03 | 东南大学 | Device and method for testing contact stress between shield tunnel segments |
| CN113483920A (en) * | 2021-07-06 | 2021-10-08 | 华北水利水电大学 | Tunnel stratum soil pressure detection sensor and construction method |
| CN114018465A (en) * | 2021-09-26 | 2022-02-08 | 深圳市市政工程总公司 | Monitoring device for shield tail pressure balance |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111076848A (en) * | 2019-12-27 | 2020-04-28 | 天津大学 | Pressure measuring device and method |
| CN113340475A (en) * | 2021-05-20 | 2021-09-03 | 东南大学 | Device and method for testing contact stress between shield tunnel segments |
| CN113340475B (en) * | 2021-05-20 | 2022-11-18 | 东南大学 | Device and method for testing contact stress between shield tunnel segments |
| CN113483920A (en) * | 2021-07-06 | 2021-10-08 | 华北水利水电大学 | Tunnel stratum soil pressure detection sensor and construction method |
| CN114018465A (en) * | 2021-09-26 | 2022-02-08 | 深圳市市政工程总公司 | Monitoring device for shield tail pressure balance |
| CN114018465B (en) * | 2021-09-26 | 2023-11-17 | 深圳市市政工程总公司 | Monitoring device for shield tail pressure balance |
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