CN205919913U - Tunnel lining structure stress monitor cell's fixed bolster - Google Patents

Abstract

The utility model provides a tunnel lining structure stress monitor cell's fixed bolster belongs to lining cutting structure monitoring technology field. This fixed bolster includes the support skeleton, and stress monitor cell fixes the connecting rod, stress monitor cell, stress monitor cell data transmission line, PVC plastic tubing and lining cutting structure built -in fitting. Sensor and simple to operate can be settled to this fixed bolster in plain concrete lining cutting structure, can not exert an influence to former lining cutting structure simultaneously to the assurance is effectively monitored country rock and lining cutting structure interact within a definite time.

Description

A kind of fixed support of tunnel lining structure stress monitoring unit

Technical field

This utility model is related to liner structure monitoring technical field, particularly relates to a kind of tunnel tunnel lining structure stress prison Survey the fixed support of unit.

Background technology

Adopt steel string type sensor generally for the pressure measxurement between country rock and supporting construction.Steel string type sensor quick Sensing unit is a string wire, and it becomes monotropic function relational design to form according to string wire tensile force with resonant frequency.Due to steel The natural frequency of vibration of string depends on its internal stress suffered by length, the density of string wire material and string wire, and its relational expression is:

$f=\frac{1}{2l}\sqrt{\frac{\mathrm{\σ}}{\mathrm{\ρ}}}---\left(1\right)$

Wherein,

The f string wire natural frequency of vibration, hz；

L string wire effective length, m；

The stress of σ string wire, pa；

ρ string wire density of material, kg/m³.

From formula (1), the string wire material used by specific sensor and string wire effective length are invariant, string wire The natural frequency of vibration is only relevant with the tension force suffered by string wire, thus the change of tension force suffered by string wire can pass through the change of the string wire natural frequency of vibration Change shows.The relational expression of tension force usable frequency f is representing:

F=(f_x ²-f₀ ²)×k₀+a (2)

Wherein,

F string wire tension force, n；

k₀Sensor sensitivity coefficient；

f_xThe string wire natural frequency of vibration after tension variation, hz；

f₀Sensor string wire original frequency, hz；

A revises constant (being set to " 0 " in practical application).

For specific sensor, as long as setting up the relation of measured physical quantity and string wire tension force, then set up physics to be measured Amount and the relation of string wire frequency of vibration, the value of measured physical quantity can be showed by string wire frequency of vibration.

The parameter that steel string type sensor is measured is mainly the natural frequency of vibration of string wire, uses vibratory string frequency in actual monitoring first Detector records string wire frequency, then the value that can get measured physical quantity by transducer calibration coefficient.

Between Tunnel Surrounding Rock Pressure and two lining structures, pressure measurement is using embedded between first lining structure surface and two lining structures Pressure cell is carried out.Pressure cell is vibrating wire pressure sensor, causes vibratory string tension force to change in sensor pressurized process, thus Cause the change of string wire frequency of vibration, and sensor pressure size is reflected with its frequency of vibration size, its relational expression is such as Under:

P=(f²-f₀ ²)×k (3)

Wherein,

P value of compressive stress (mpa)；

f₀Pressure is the frequency (hz) when " zero "；

F measures frequency (hz)；

K transducer calibration constant (mpa/hz²).

The initial frequency value of pressure transducer records after installation is complete, the initial frequency of the pressure between country rock and two lining structures Rate records reference value after two lining structure concrete one-piece castings complete 24h.

Generally involve the interaction that liner structure monitoring refers both between country rock and first lining structure, such as to country rock-supporting Between structure, stress, supporting construction strain are monitored.And monitoring means pass through colligation form generally according to instrument layout position It is fixed on the reinforced mesh of first lining structure, to reach the purpose of the intermolecular forces of monitoring country rock and liner structure.

Be related to country rock two lining structure interphase interaction monitoring when, monitoring instrument generally according to installation site colligation two lining On the steel bar stress of structure, if two lining structures be plain concrete construction, useless in dispose monitoring means reinforcing bar when it is impossible to meet Place the requirement of monitoring means, then cannot realize effectively monitoring.

Utility model content

The technical problems to be solved in the utility model is to provide a kind of fixation of tunnel lining structure stress monitoring unit to prop up Frame, poor to solve the problems, such as existing traditional instrument setting monitoring effect.

This fixed support include support skeleton, stress monitoring unit fix connecting rod, stress monitoring unit, data line, Pvc plastic tube and liner structure built-in fitting, stress monitoring unit is fixed on support skeleton by the fixing connecting rod of stress monitoring unit On, data line is connected with stress monitoring unit, and outside data line, data line and pvc mould pvc plastic pipe sleeve Expects pipe is embedded in liner structure built-in fitting.

Wherein, stress monitoring unit and pvc plastic tube seal in seam, and pvc plastic tube and liner structure built-in fitting exist Seam seals.The fixing connecting rod of stress monitoring unit and support skeleton are sequentially located at stress monitoring unit bottom.Stress monitoring list The fixing connecting rod of unit adopts the diameter of reinforcing bar to be less than the diameter that support skeleton adopts reinforcing bar.Stress monitoring unit fixes connecting rod reinforcing bar phase Hand over setting, the fixing connecting rod number of steel bars of stress monitoring unit is no less than 2.The length phase of two reinforcing bars in support skeleton the same side With.Stress monitoring unit is fixed on the fixing connecting rod of stress monitoring unit using steel wire or band, and stress monitoring unit is fixing even Bar and support skeleton are connected with welding manner.

The length at support skeleton two ends accordingly will adjust according to the size of liner structure, can not arrange long in order to avoid to lining cutting Structure impacts, and also can not arrange too short in order to avoid the effect of accurate measurement can not be reached.

The having the beneficial effect that of technique scheme of the present utility model:

Stress monitoring unit can be consolidated and be positioned in plain concrete liner structure, thus reaching monitoring by this fixed support Purpose.

Brief description

Fig. 1 is the fixing rack structure schematic diagram one of tunnel lining structure stress monitoring unit of the present utility model；

Fig. 2 is the fixed support structural scheme of mechanism two of tunnel lining structure stress monitoring unit of the present utility model；

Fig. 3 is that the support bracket fastened liner structure built-in fitting of tunnel lining structure stress monitoring unit of the present utility model shows It is intended to.

Wherein: 1- support skeleton；2- stress monitoring unit fixes connecting rod；3- stress monitoring unit；4- data line；5- Pvc plastic tube；6- liner structure built-in fitting.

Specific embodiment

For making the technical problems to be solved in the utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing And specific embodiment is described in detail.

This utility model provides a kind of fixed support of tunnel lining structure stress monitoring unit, as depicted in figs. 1 and 2, This fixed support includes support skeleton 1, stress monitoring unit fixes connecting rod 2, stress monitoring unit 3, data line 4, pvc mould Expects pipe 5 and liner structure built-in fitting 6, stress monitoring unit 3 is fixed on support skeleton 1 by the fixing connecting rod 2 of stress monitoring unit On, data line 4 is connected with stress monitoring unit 3, and pvc plastic tube 5 is enclosed within outside data line 4, as shown in figure 3, number It is embedded in liner structure built-in fitting 6 according to transmission line 4 and pvc plastic tube 5.

It is explained with practical operation below.

1st, each component size explanation

The physical dimension of stress monitoring unit 3 can be customized according to monitoring purpose, a diameter of 12～14cm of ordinary circumstance, If stress monitoring unit 3 diameter is excessive, liner structure can be impacted and inconvenience is installed, if diameter is too small, can not reach Detection requirement.Fixing connecting rod 2 length of stress monitoring unit can extend 3～5cm according to stress monitoring unit 3 diameter two ends, should The hot rolling plain bar of a diameter of 6～8mm generally selected by fixing connecting rod 2 material of power monitoring means.The length of support skeleton 1 then root To determine according to two lining structure thickness, in general, the length of support skeleton 1 should meet and for stress monitoring unit 3 to be fixed on two linings knots The thickness of concrete cover of structure centre position and close first lining side is at least 15cm, and the material of support skeleton 1 is generally from directly Footpath is the hot rolling plain bar of 10～12mm.

2nd, installation method

By in stress monitoring unit 3 colligation to the fixing connecting rod 2 of stress monitoring unit, support skeleton 1 and two lining chassis are led to The microdot that kicks the beam weldering connects, and adjusts support bone according to the position placing stress monitoring unit 3 required in plain concrete two lining structure Frame 1 needs the length of spot welding so that stress monitoring unit 3 and two serves as a contrast chassis face keeping parallelisms.Data line 4 is moulded from pvc Lead in expects pipe 5 in liner structure built-in fitting 6, and join with stress monitoring unit 3 in data line 4 and pvc plastic tube 5 Place and pvc plastic tube 5 and liner structure built-in fitting 6 junction carry out seal approach, prevent concrete slurry during casting concrete Enter liner structure built-in fitting 6 by pvc plastic tube 5 to block built-in fitting, treat chassis envelope mould casting concrete and move forward When carrying out next template construction, chassis movement is separated with the support skeleton 1 of fixed stress monitoring means 3 so that pressure cell is solid Determine to be monitored in target two lining structure.

The above is preferred implementation of the present utility model it is noted that ordinary skill for the art For personnel, on the premise of without departing from principle described in the utility model, some improvements and modifications can also be made, these improvement Also should be regarded as protection domain of the present utility model with retouching.

Claims (7)

1. a kind of fixed support of tunnel lining structure stress monitoring unit it is characterised in that: include support skeleton (1), stress The fixing connecting rod (2) of monitoring means, stress monitoring unit (3), data line (4), pvc plastic tube (5) and liner structure are pre-buried Part (6), stress monitoring unit (3) is fixed on support skeleton (1) by the fixing connecting rod (2) of stress monitoring unit, data transfer Line (4) is connected with stress monitoring unit (3), and it is outside that pvc plastic tube (5) is enclosed within data line (4), data line (4) and Pvc plastic tube (5) is embedded in liner structure built-in fitting (6).

2. tunnel lining structure stress monitoring unit according to claim 1 fixed support it is characterised in that: described should Power monitoring means (3) are sealed in seam with pvc plastic tube (5), and pvc plastic tube (5) and liner structure built-in fitting (6) are in interface Place's sealing.

3. tunnel lining structure stress monitoring unit according to claim 1 fixed support it is characterised in that: described should The fixing connecting rod (2) of power monitoring means and support skeleton (1) are sequentially located at stress monitoring unit (3) bottom.

4. tunnel lining structure stress monitoring unit according to claim 1 fixed support it is characterised in that: described should The bar diameter that the bar diameter that the fixing connecting rod (2) of power monitoring means adopts adopts less than support skeleton (1).

5. tunnel lining structure stress monitoring unit according to claim 1 fixed support it is characterised in that: described should Fixing connecting rod (2) reinforcing bar of power monitoring means intersects setting, and fixing connecting rod (2) number of steel bars of stress monitoring unit is more than or equal to 2.

6. tunnel lining structure stress monitoring unit according to claim 1 fixed support it is characterised in that: described The length of two reinforcing bars in frame skeleton (1) the same side is identical.

7. tunnel lining structure stress monitoring unit according to claim 1 fixed support it is characterised in that: described should Power monitoring means (3) are fixed on the fixing connecting rod (2) of stress monitoring unit using steel wire or band, and stress monitoring unit is fixing even Bar (2) and support skeleton (1) are connected with welding manner.