CN107764328A - Three bracing members axle power relaxation pressure, temperature and humidity control automatic alarm systems - Google Patents
Three bracing members axle power relaxation pressure, temperature and humidity control automatic alarm systems Download PDFInfo
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- CN107764328A CN107764328A CN201710971593.XA CN201710971593A CN107764328A CN 107764328 A CN107764328 A CN 107764328A CN 201710971593 A CN201710971593 A CN 201710971593A CN 107764328 A CN107764328 A CN 107764328A
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- Prior art keywords
- temperature
- bracing members
- switch
- axle power
- humidity
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The present invention relates to three bracing members axle power relaxation pressure, temperature and humidity control automatic alarm systems, for three bracing members axle power relaxation cases pressure, temperature and humidity control automatic alarm systems.Bracing members are city open cut or half lid excavation construction tunnel and a kind of important component of common supporting structure system of deep basal pit.Warning sound is sent automatically immediately when an axial force of the supports that can be sensed or member temperature are placed in bracing members end or crater wall humidity changes and reaches a threshold value, and is equipped with three control warning systems that colour lamplight is shown.The effect and advantage of the present invention is to realize bracing members axle power relaxation pressure, the automatic alarm of three control of member temperature and foundation pit side-wall humidity.
Description
Technical field
The present invention relates to support force relaxation warning system, particularly tunnel or system of deep foundation pit support in using bracing members as
Primarily transverse supporting member, three pressure, temperature and humidity control automatic alarm systems when bracing members axle power relaxes.
Background technology
Bracing members are the important of city open cut or half lid excavation construction tunnel and a kind of common supporting structure system of deep basal pit
Part.The composition of this Bracing Systems generally includes：Before excavation of foundation pit by drilling construction pour go along with sb. to guard him campshed,
Horizontal steel pipe horizontal support, fender post top is consolidated the Guan Liang of the common stress of one, provides the trestle plate in constructing operation face, carries
Lattice column for vertical supporting power, the steel purlin for supporting for bracing members both ends stress, lattice column bottom pile foundation, for bracing members just
Support of the bit parallel in binder direction, the concrete binder parallel to Guan Liang direction.It is pre- to apply that bracing members set movable end
Pressure.
This support system resistance to overturning is good, using very more in engineering practice.Bracing members are to safeguarding that foundation ditch is stable
Property, reduce the inside occurred level displacement of foundation pit enclosure stake, ensure that the dimensional space of main body construction plays an important roll.Foundation pit enclosure
Horizontal displacement of the stake to inner side keeps stable after bracing members are set up.In order to ensure bracing members axle power is no more than design code, prevent
Only supporting deformation unstability, ensure deformation and Bit andits control of the building enclosure in Excavation Process in the range of a reference value, from
And ensure station construction and be normally carried out safely.
Foundation ditch deformation is excessive, temperature change or crater wall humidity it is excessive be to cause the change of bracing members axle power most direct three greatly
Reason.When temperature decrease, the shortening of the original axial length of bracing members can be caused by expanding with heat and contract with cold, original geometrical length gesture of change
The relaxation of axle power must be caused, this will lower original supporting role.And support the soil body of both sides lateral pressure lose it is original
Support and cause to be subjected to displacement, the dangerous generation of foundation pit structure may be caused.Therefore carrying out safety monitoring to bracing members axle power is
The main contents of Excavation Monitoring.Axial compressive force sensor is arranged on the end of bracing members, is sensed with supporting axial compressive force
Device mounting bracket is fixed.Bracing members axle power monitors generally use type vibration wire axial compressive force sensor reading instrument to carry out.Each disconnected
One group of axial compressive force sensor is laid in support on face.Monitoring foundation ditch supports the change of axle power in work progress, avoids support shaft
Power, which exceedes design strength, causes supporting destruction to cause whole support system unstability.It fact proved that day and night temperature is excessive, crater wall is moist
Excessive with foundation pit deformation is the three big most direct main causes for causing axle power to be mutated.When crater wall moist or nocturnal temperature of drenching with rain is rapid
Drop, relaxation cases will certainly occur in bracing members axle power, easily cause support to be failed, and these situations occur and must all take at once to arrange
Apply processing.When taking personal monitoring, such case is difficult to find in time, often inconceivable, but is also true
's.Such as certain subway foundation pit engineering, axial force of the supports is mutated.Bracing members there and then noon temperature is up to 37 degree, and night
Temperature only has 16 degree during heavy rain, and the luffing of one day has reached 21 degree, it means that heavy rain period all bracing members more than 60%
Axle power will disappear.If such case can be predicted before very heavy rains, necessary supplement and tune are carried out to axial force of the supports in time
Whole, then accident is largely that can avoid occurring.The method of current precognition difference variation is mainly according to meteorological department day
Gas is forecast, to grasp the changing rule in local temperature Change, abnormality and bad weather and season and day and night temperature to estimate support
The change of axle power, particularly to there's a sudden fall in temperature, caused axle power relaxation response is not prompt enough, easily triggers accident.
For in tunnel or system of deep foundation pit support using bracing members as primarily transverse supporting member, when axle power relaxes
Situation about can not find in time, take bracing members end place one can real-time monitor axle power change, it is certain when reaching
Send warning sound during limit value automatically immediately, and be equipped with colour lamplight and show, corresponding prediction scheme measure is thus taken, so as to avoid
The generation of engineering accident.
The content of the invention
Goal of the invention：
In order to solve above-mentioned technical problem, a kind of bracing members axle power relaxation pressure, temperature and humidity three are invented
Control automatic alarm system.Take bracing members end place one can real-time monitor component axle power change and temperature become
Change, warning sound is sent automatically immediately when axle power, crater wall humidity and the member temperature change sensed reaches a threshold value, and
It is equipped with the warning system that colour lamplight is shown.
Technical scheme：
Three a kind of bracing members axle power relaxation pressure, temperature and humidity control automatic alarm systems, it is characterised in that：
Including bracing members, axle power temperature switch, humidity switch and the part of alarm four composition；
The bracing members are horizontally installed between two vertical fender posts；
The alarm includes：
Contact plate is fulcrum into lever construction using support column；Wherein one end of contact plate is another by spring connect base
There is electromagnet between end and base, have space between electromagnet and contact plate；
The electromagnet and axle power temperature switch and electromagnet ring current composition closed-loop path；Humidity switchs (3) and axle
Power temperature switch is in parallel；
Contact on contact plate is normally closed with green light binding post and ring current and green light is formed loop；
In the state of electromagnet is powered absorption contact plate, contact contacts with red light binding post, makes red light, PLC groups, electric bell
And ring current forms closed-loop path；
The axle power temperature switch is made up of temperature detect switch (TDS) and pressure control switch, is arranged on the end of the bracing members.
The humidity switch is arranged in the crater wall of foundation ditch.
Three described bracing members axle power relaxation pressure, temperature and humidity control automatic alarm systems, it is characterised in that：Institute
The structure for stating each pressure control switch is separated between two panels bearing plate by pressure-bearing spring, is oppositely arranged on the inside of two panels bearing plate
There are contact and pressure switch binding post.
Three described bracing members axle power relaxation pressure, temperature and humidity control automatic alarm systems, it is characterised in that：Institute
PLC groups are stated to be made up of three PLC；Wherein PLC1 is connected with temperature detect switch (TDS)；Wherein PLC2 is connected with pressure control switch；Wherein
PLC3 connects with humidity switch；Each PLC is connected with electric bell and red light；Different alarm modes is set in described each PLC；
When PLC1 is triggered, blinking red lamp is controlled, 10 seconds interruptions of electric bell sounding circulate for 5 seconds；When PLC2 is triggered, control red light is held
Continuous to light, 5 seconds interruptions of electric bell sounding circulate for 5 seconds；When PLC3 is triggered, the batch (-type) flicker of control red light, electric bell sounding 15 seconds
Interruption circulates for 5 seconds.
Three described bracing members axle power relaxation pressure, temperature and humidity control automatic alarm systems, it is characterised in that：Institute
The alarming value for the pressure control switch stated, it is calculated according to the steel pipe parameter that bracing members use, formula is as follows：
In formula：D is outer diameter of steel pipes, unit mm；D is pipe diameter, unit mm；K is long column safety coefficient, and f resists for material
Compressive Strength design load, unit kN/mm2。
Three described bracing members axle power relaxation pressure, temperature and humidity control automatic alarm systems, it is characterised in that：Institute
The temperature detect switch (TDS) closure condition stated is day and night temperature bust value >=10 DEG C or synchronization temperature change value >=10 DEG C or component temperature
Degree is less than -15 DEG C.
Described humidity switch (3) closure condition is that humidity is mutated more than 15% or humidity is less than 55% or humidity is higher than
85%.
Advantage and effect：
The effect and advantage of the present invention is to realize bracing members axle power relaxation pressure, the automatic report of three controls of temperature and humidity
It is alert, it is automatic accurate, without artificial on duty.
1) when bracing members axle power stress numerically can be according to support structure designs, the range model of design pressure switch is carried out
Enclose, determine the upper and lower bound limit value of alarm pressure value.
2) in control, set when temperature detect switch (TDS) is opened also according to the temperature value designed in advance；
3) it is similar, set when wet control switch is opened also according to the humidity value designed in advance in control；
4) realize automatic unattended and there is instantaneity warning function.
Thus corresponding prediction scheme measure is taken, so as to avoid because humidity increases severely, temperature shock and axial force of the supports relaxation cause
Engineering accident generation.
Brief description of the drawings：
Fig. 1 alarm schematic diagrames；
Fig. 2 is pressure control switch structural representation；
Fig. 3 is foundation pit supporting construction schematic diagram；
It is described to be labeled as：1. temperature detect switch (TDS), 2. pressure control switch, 3. humidity switch, 4. contact plates, 5. electromagnet, 6.
Contact, 7. green light binding posts, 8. red light binding posts, 9. green lights, 10. red lights, 11. alarm electric bells, 12. alarm lamp ring currents,
13. electromagnet ring current, 14. pressure-bearing springs, 15. bearing plates, 16. pressure switch binding posts, 17. fender posts, 18. Guan Liangs,
19. concrete support, 20. steel pipe columns, 21. bracing members, 22. steel purlins, 23. floors, 24. grounds；
Embodiment
The system includes four parts, i.e., bracing members, humidity switch, warning device and bracing members in system of deep foundation pit support
The part of axle power temperature switch four composition of end.
As shown in Figure 3：
System of deep foundation pit support generally includes：Before excavation of foundation pit campshed 17, horizontal steel are gone along with sb. to guard him by what drilling construction poured
Pipe horizontal support 21, fender post top is consolidated the Guan Liang 18 of the common stress of one, provides the trestle plate in constructing operation face, provides
The lattice column 20 of vertical supporting power, support for bracing members both ends the steel purlin 22 of stress, lattice column bottom pile foundation, for bracing members
Support parallel to binder direction, the concrete binder parallel to Guan Liang direction in place.Bracing members set movable end to apply
Precompression.
The bracing members 21 are horizontally installed between two vertical fender posts 17；
Axle power temperature switch is made up of temperature detect switch (TDS) 1 and pressure control switch 2, is arranged on the end of the bracing members 21.
Humidity switch 3 is arranged in the crater wall of foundation ditch.
Above-mentioned switch links together with alarm, and the structure of alarm is as shown in Figure 1：
Contact plate 4 is fulcrum into lever construction using support column；Wherein one end of contact plate 4 is by spring connect base, separately
There is electromagnet 5 between one end and base, have space between electromagnet 5 and contact plate 4；
The electromagnet 5 forms closed-loop path with axle power temperature switch and electromagnet ring current 13；
Contact 6 on contact plate 4 is normally closed with green light binding post 7 and ring current 12 and green light 9 is formed loop；
In the state of electromagnet 5 is powered absorption contact plate 4, contact 6 contacts with red light binding post 8, makes red light 10, PLC
Group, electric bell 11 and ring current 12 form closed-loop path；
The structure of each pressure control switch is separated between two panels bearing plate 15 by pressure-bearing spring 14, two panels pressure-bearing
The inner side of plate 15 is relatively set with contact and pressure switch binding post 16；
PLC groups are provided with the alarm, the PLC groups are made up of three PLC；Wherein PLC1 is connected with temperature detect switch (TDS) 1；
Wherein PLC2 is connected with pressure control switch 2；Wherein PLC3 is connected with humidity switch 3；Each PLC connects with electric bell 11 and red light 10
Connect；Different alarm modes is set in described each PLC；When PLC1 is triggered, blinking red lamp, the sounding 10 of electric bell 11 are controlled
Second interruption circulates for 5 seconds；When PLC2 is triggered, control red light is persistently lighted, and 11 sounding of electric bell, 5 seconds interruptions circulate for 5 seconds；Work as PLC3
When being triggered, control red light batch (-type) flicker, 11 sounding of electric bell, 15 seconds interruptions circulate for 5 seconds.It is specific as follows：
The warning lamp of table 1 and alarm bell alarm mode are set
Reach alarming value to better discriminate between axle power relaxation, temperature decrease or humidity mutation, in warning lamp and alarm bell
Configure 3 groups of cyclelogs (PLC) on circuit, it is supporting that 3 groups of different police instruction red lights and alarm bell are set, in favor of can be accurate
Really distinguish warning reason.When axial compressive force reaches alarming value, the 1st group of cyclelog PLC1 work, the 1st group alarm of setting
Indicate that red light and alarm bell start alarm；Similar, when temperature decrease reaches alarming value, the 2nd group of cyclelog PLC2 work,
The 2nd group alarm instruction red light and alarm bell set starts alarm；Similar, when foundation pit side-wall humidity rises to alarming value, the 3rd
The PLC3 work of group cyclelog, the 3rd group alarm instruction red light and alarm bell of setting start alarm.
When foundation pit construction, bracing members temperature and bracing members axle power are in normal range (NR), device is in and connect by 7 green lights
Terminal, 9 normal work green lights and 12 ring currents form closed-loop path, and now bracing members are in normal operating conditions, green light
Rise.When temperature drops to certain numerical value, temperature detect switch (TDS) closure, 5 work of electromagnet produce magnetic force, by 6, contact joint and 7 green lights
Wiring post separation, and 8 red light binding posts connect, and system is in by 8 red light binding posts, 9 police instruction red lights, 11 alarm electric bells
Closed-loop path is formed with 12 ring currents, red light lights while electric bell sounds, and sends alarm signal.Similar, work as foundation pit side-wall
Humidity because the reasons such as rainfall rise to certain numerical value when, humid control switch closure, 5 work of electromagnet produce magnetic force, by 6, touch
Strip terminal and 7 green light wiring post separations, and 8 red light binding posts connect, and system is in red by 8 red light binding posts, 9 police instructions
Lamp, 11 alarm electric bells and 12 ring currents form closed-loop path, and red light lights while electric bell sounds, and sends alarm signal.It is similar
, the relaxation of bracing members axle power, when support force drops to certain numerical value, pressure switch closure, 5 work of electromagnet produce magnetic force, by 6,
Contact joint and 7 green light wiring post separations, and 8 red light binding posts connect, and system is in by 8 red light binding posts, 9 police instructions
Red light, 11 alarm electric bells and 12 ring currents form closed-loop path, and red light lights while electric bell sounds, and sends alarm signal.
It is different according to the steel strength of steel pipe column in actual use, different alarming values is set to pressure switch.Such as certain
The specification of the horizontal bracing members of the quick main line Tunnel Design in city north and south is steel pipeSteel strength is designed as 315N/
mm2, axle power design bearing capacity refers to formula (1)：
D is outer diameter of steel pipes in formula, unit mm；D is pipe diameter, unit mm；K is long column safety coefficient, and f resists for material
Compressive Strength design load, unit kN/mm2.Thus specification, which is calculated, is 's
The design bearing capacity of bracing members, 70%, 75%, 80% alarming value refer to table 2：
The different size bracing members design bearing capacity of table 2,70%, 75%, 80% alarming value
Bracing members refer to formula (2) with temperature change geometrical length variable quantity computational methods：
Δ l=l0(t-t0)α (2)
L in formula0For the geometrical length of bracing members, unit mm；T bracing members actual temperatures, unit DEG C；T0 normal temperatures,
Unit DEG C；α is steel linear expansion coefficient, 11.8 × 10-6, mm/ DEG C of unit.
Using specification as steel pipeThe bracing members that 20 meters of length calculate, and when temperature often reduces by 10 DEG C, bracing members shorten
2.36mm.This thing happens, directly contributes the axle power relaxation up to more than 20% of bracing members.According to this result of calculation and refer to
Engineering experience, determine that this alarm system temperature sensor alarm value is shown in Table 3：
3 alarm system temperature sensor alarm values of table
In addition, humidity change is excessive or more than certain numerical value in the foundation ditch, breast wall concrete stake stress and displacement are influenceed, most
The axle power change of bracing members is influenced whether at last.According to engineering experience, setting humidity mutation is more than 15% or less than 55% or high
Give alarm in 85%.
By the implementation of such scheme, realize bracing members axle power relaxation pressure and temperature, humidity three control automatic alarm, from
It is dynamic accurate, without artificial on duty.
Claims (6)
1. three a kind of bracing members axle power relaxation pressure, temperature and humidity control automatic alarm systems, it is characterised in that：
Including bracing members (21), axle power temperature switch, humidity switch and the part of alarm four composition；
The bracing members (21) are horizontally installed between two vertical fender posts (17)；
The alarm includes：
Contact plate (4) is fulcrum into lever construction using support column；Wherein one end of contact plate (4) is by spring connect base, separately
There is electromagnet (5) between one end and base, have space between electromagnet (5) and contact plate (4)；
The electromagnet (5) and axle power temperature switch and electromagnet ring current (13) composition closed-loop path, humidity switch (3) with
Axle power temperature switch is in parallel；
Contact (6) on contact plate (4) is normally closed with green light binding post (7) and forms back ring current (12) and green light (9)
Road；
In the state of electromagnet (5) is powered absorption contact plate (4), contact (6) contacts with red light binding post (8), makes red light
(10), PLC groups, electric bell (11) and ring current (12) form closed-loop path；
The axle power temperature switch is made up of temperature detect switch (TDS) (1) and pressure control switch (2), is arranged on the bracing members (21)
End；
The humidity switch (3) is arranged in the crater wall of foundation ditch.
2. three bracing members axle power relaxation pressure according to claim 1, temperature and humidity control automatic alarm systems, its
It is characterised by：The structure of each pressure control switch (2) is separated between two panels bearing plate (15) by pressure-bearing spring (14),
Contact and pressure switch binding post (16) are relatively set with the inside of two panels bearing plate (15).
3. three bracing members axle power relaxation pressure according to claim 1, temperature and humidity control automatic alarm systems, its
It is characterised by：The PLC groups are made up of three PLC；Wherein PLC1 is connected with temperature detect switch (TDS) (1)；Wherein PLC2 and Stress control
Switch (2) connection；Wherein PLC3 is connected with humidity switch (3)；Each PLC is connected with electric bell (11) and red light (10)；Described
Each PLC in different alarm modes is set；When PLC1 is triggered, blinking red lamp, 10 seconds interruptions 5 of electric bell (11) sounding are controlled
Second circulation；When PLC2 is triggered, control red light is persistently lighted, and 5 seconds interruptions of electric bell (11) sounding circulate for 5 seconds；When PLC3 is touched
During hair, control red light batch (-type) flicker, 15 seconds interruptions of electric bell (11) sounding circulate for 5 seconds.
4. three bracing members axle power relaxation pressure according to claim 1, temperature and humidity control automatic alarm systems, its
It is characterised by：The alarming value of described pressure control switch (2), the steel pipe parameter used according to bracing members (21) calculate
Go out, formula is as follows：
In formula：D is outer diameter of steel pipes, unit mm；D is pipe diameter, unit mm；K is long column safety coefficient, and f is material pressure resistance
Spend design load, unit kN/mm2。
5. three bracing members axle power relaxation pressure according to claim 1, temperature and humidity control automatic alarm systems, its
It is characterised by：Described temperature detect switch (TDS) (1) closure condition is day and night temperature bust value >=10 DEG C or synchronization temperature change value
>=10 DEG C or member temperature are less than -15 DEG C.
6. three bracing members axle power relaxation pressure according to claim 1, temperature and humidity control automatic alarm systems, its
It is characterised by：Described humidity switch (3) closure condition is that humidity is mutated more than 15% or humidity is less than 55% or humidity is higher than
85%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710971593.XA CN107764328A (en) | 2017-10-18 | 2017-10-18 | Three bracing members axle power relaxation pressure, temperature and humidity control automatic alarm systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710971593.XA CN107764328A (en) | 2017-10-18 | 2017-10-18 | Three bracing members axle power relaxation pressure, temperature and humidity control automatic alarm systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107764328A true CN107764328A (en) | 2018-03-06 |
Family
ID=61268804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710971593.XA Pending CN107764328A (en) | 2017-10-18 | 2017-10-18 | Three bracing members axle power relaxation pressure, temperature and humidity control automatic alarm systems |
Country Status (1)
| Country | Link |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101463606A (en) * | 2007-12-19 | 2009-06-24 | 上海隧道工程股份有限公司 | Foundation pit controllable hydraulic steel support and use thereof |
| CN102979071A (en) * | 2012-12-04 | 2013-03-20 | 中铁二十一局集团有限公司 | Remote intelligent monitoring and three-dimensional early warning method and system for stress stability of deep foundation pit |
| CN205333117U (en) * | 2016-01-15 | 2016-06-22 | 西安科技大学 | Dark excavation supporting alarm system |
| CN206451349U (en) * | 2016-12-20 | 2017-08-29 | 江西飞尚科技有限公司 | A kind of bracing members axle power on-line monitoring system |
-
2017
- 2017-10-18 CN CN201710971593.XA patent/CN107764328A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101463606A (en) * | 2007-12-19 | 2009-06-24 | 上海隧道工程股份有限公司 | Foundation pit controllable hydraulic steel support and use thereof |
| CN102979071A (en) * | 2012-12-04 | 2013-03-20 | 中铁二十一局集团有限公司 | Remote intelligent monitoring and three-dimensional early warning method and system for stress stability of deep foundation pit |
| CN205333117U (en) * | 2016-01-15 | 2016-06-22 | 西安科技大学 | Dark excavation supporting alarm system |
| CN206451349U (en) * | 2016-12-20 | 2017-08-29 | 江西飞尚科技有限公司 | A kind of bracing members axle power on-line monitoring system |
Non-Patent Citations (1)
| Title |
|---|
| PIQMCX38: "温差对钢支撑轴力的影响及调整方法", 《豆丁网HTTPS://WWW.DOCIN.COM/P-2029976521.HTML》 * |
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Application publication date: 20180306 |