CN104819924A - Instrument and test method for simulating underwater tunnel concrete water pressure penetration test - Google Patents
Instrument and test method for simulating underwater tunnel concrete water pressure penetration test Download PDFInfo
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- CN104819924A CN104819924A CN201510251497.9A CN201510251497A CN104819924A CN 104819924 A CN104819924 A CN 104819924A CN 201510251497 A CN201510251497 A CN 201510251497A CN 104819924 A CN104819924 A CN 104819924A
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Abstract
The invention discloses an instrument for simulating an underwater tunnel concrete water pressure penetration test. The instrument comprises a nitrogen cylinder, a stainless steel water receiver, pressure chambers, a pressure regulating valve and a pipeline, wherein the nitrogen cylinder provides pressure, and the pressure needed by the test is regulated by virtue of a pressure gage at the cylinder opening and the pressure regulating valve on the lower part; nitrogen enters the stainless steel water receiver by virtue of the pipeline and applies pressure to the liquid, the liquid flows into a concrete precast test block in the pressure chamber, and corresponding pressure is applied to the side wall of the pressure chamber; the pressure value in the water receiver is displayed by the pressure gage above the water receiver; totally four pressure chambers are formed, four test blocks can be pressurized at a time, and each pressure chamber is provided with an independent water inlet valve; and preserved cylindrical water inlets communicated with one another are formed in the middle of the precast test blocks, and the water inlets are aligned with water inlets in the bottoms of the pressure chambers during the test. The instrument disclosed by the invention has the beneficial effects that the environment in which underwater tunnel concrete is positioned is well simulated, the whole penetration test device is simple in structure, easy to operate and convenient to use and is applied to high-performance concrete.
Description
Technical field
The present invention relates to a kind of water pressure infiltration experiment device and test method, the instrument of tunnel concrete water pressure permeability test and test method thereof under especially a kind of Simulated Water.
Background technology
Carry out the concrete infiltrative research of submerged tunnel, indispensable ingredient in tunnel permanance research, also has important practical significance to the evaluation of tunnel concrete permanance and the design of tunnel high durability concrete beyond doubt.Close relationship is had between concrete permeability and permanance.Such as, chemical erosion causes because water and erosion carbon dioxide infiltrate concrete; Steel bar corrosion is caused by protective seam, passivating film are destroyed; Concrete freeze-thaw damage causes owing to infiltrating concrete water icing frost heave under subzero temperature.
Submerged tunnel concrete is in underwater environment, and by extraneous hydraulic pressure effect outside it, inner side is in atmospheric environment, and interior outside exists differential water pressures.It is the important factor in order of submerged tunnel concrete pressure infiltration that water pressure exists, and existing pressure permeation equipment mainly applies extraneous water pressure to test block, can not to meet under Simulated Water outside in tunnel concrete and there is the situation of differential water pressures.
The domestic concrete environment not yet having simulation submerged tunnel, the patent of moisture penetration test unit and test method in high performance concrete under pressure head.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of rational in infrastructure, simple to operate, easy to use, be applicable to instrument and the test method thereof of tunnel concrete water pressure permeability test under the Simulated Water of high performance concrete.
The instrument of tunnel concrete water pressure permeability test under this Simulated Water, comprises nitrogen cylinder, stainless steel water receiver, pressure chamber, pressure regulating valve and pipeline; Nitrogen cylinder provides pressure, regulates the pressure needed for test by the tensimeter of bottle mouth position and the pressure regulating valve of bottom; Nitrogen enters stainless steel water receiver by pipeline, applies pressure, the concrete prefabricated test block in fluid inflow pressure room to liquid wherein, applies relevant pressure to its sidewall; Force value in tensimeter display water receiver above water receiver; Have 4 pressure chambers, once can to 4 test block pressurizations, there is independently inlet valve each pressure chamber; There is through reserved cylinder water-feeding hole in the middle of prefabricated test block, during test, water-feeding hole is aimed at the water-feeding hole bottom pressure chamber.
As preferably: described pressure chamber is only provided with water-feeding hole at bottom centre position.
As preferably: in described pressure chamber, prefabricated test block has silica gel pad and lower gasket center drilling up and down respectively.
As preferably: described pressure chamber upper cover has stainless-steel sheet, fixes with six roots of sensation lever, and be cylindrical coil fastening-type pressure chamber, its surrounding is transparent plastic locular wall.
As preferably: it is truncated cone-shaped that described pressure permeation tests prefabricated test block.
Under Simulated Water, the test method of the instrument of tunnel concrete water pressure permeability test, comprises the steps:
The first step: first pressure chamber base is dried, put silicagel pad, concrete test block clean for prior surface wipes is placed on silica gel pad, test block upper surface also puts the same silica gel pad of size, finally cover stainless-steel sheet, tighten the fixed screw on top.
Second step: the valve opening water receiver bottom, with water pump by water suction water receiver.Open two valves between nitrogen cylinder and water receiver, and open nitrogen cylinder, be adjusted to required pressure, guarantee that water receiver tensimeter is consistent with the reading of nitrogen pressure table.
3rd step: the inlet valve opening pressure chamber after pressure stability, starts test.
4th step: after completing test to the schedule time, closing presure room inlet valve, take out test block, on pressure testing machine, centrally rive in duct.
5th step: measure length of penetration with vernier caliper after riving, average.
The invention has the beneficial effects as follows: by the pattern of pressure of new middle water flowing, by atmospheric pressure outside test block, simulate the environment residing for submerged tunnel concrete better.Controllable pressure device energy accurate stable ground controls water pressure, and whole infiltration experiment device structure is simple, simple to operate, easy to use, is applicable to high performance concrete.This pressure apparatus can provide high and stable pressure for test, carries out independent control, facilitate the setting of test to each test block.The pattern of pressure of middle water flowing avoids that to need the sealing of test block remaining surface loaded down with trivial details over, in the middle of concrete, duct is equivalent to the lateral surface of submerged tunnel, be subject to the effect of water pressure, communicate with the external world outside concrete test block and bear atmospheric pressure, be equivalent to inside submerged tunnel.The reserved of duct makes follow-up sampling procedure become simple, only need cut open with pressure testing machine, directly can measure length of penetration.
Accompanying drawing explanation
Fig. 1 is this patent schematic diagram;
Fig. 2 is this patent pressure permeation instrument structural map;
Fig. 3 is this patent pressure permeation instrument sectional view;
Description of reference numerals: test block 1, water-feeding hole 2, silica gel pad 3, pressure chamber 4, stainless-steel sheet 5, steel pole 6, single pressure chamber water inlet pipe 7, single pressure chamber drainpipe 8, inlet valve 9, water inlet manifold 10, water receiver 11, nitrogen cylinder 12, water receiver tensimeter 13, nitrogen pressure table 14, water inlet pipe tensimeter 15, instrument platform 16
Embodiment
Below in conjunction with drawings and Examples, the present invention is described further.Although the present invention will be described in conjunction with preferred embodiment, should know, and not represent and limit the invention in described embodiment.On the contrary, the present invention will contain can be included in attached claims limit scope of the present invention in alternative, modified and equivalent.
As shown in Figure 1 to Figure 3, under this Simulated Water of the present embodiment, tunnel concrete water pressure infiltration experiment device is made up of nitrogen cylinder 12, stainless steel water receiver 11, pressure chamber 4, pressure regulating valve 9 and pipeline more than 10 part.Nitrogen cylinder 12 provides pressure, regulates the pressure needed for test by the tensimeter 14 of bottle mouth position and the pressure regulating valve of bottom.Nitrogen enters stainless steel water receiver 11 by pipeline 10, applies pressure, the concrete prefabricated test block 1 in fluid inflow pressure room 4 to liquid wherein, applies relevant pressure to its sidewall.Whether the tensimeter 13 above water receiver 11 shows the force value in water receiver 11, by this value compared with the force value in nitrogen cylinder 12 exit, can leak gas by verification system.This complete equipment has 4 pressure chambers 4, and once can pressurize to 4 test blocks 1, there is independently inlet valve 9 each pressure chamber, can control separately.Through reserved cylindrical cavity 2 is had in the middle of prefabricated test block 1, during test, cylindrical cavity 2 is aimed at the water-feeding hole bottom pressure chamber, in described pressure chamber, prefabricated test block about 1 has thickness to be the silica gel pad 3 of 1cm and lower gasket center drilling respectively, plays good sealing function.Described pressure chamber upper cover has thickness to be the stainless-steel sheet 5 of 2cm, and fixing with six roots of sensation lever 6, is cylindrical coil fastening-type pressure chamber, and its surrounding adopts transparent material to be made.It is truncated cone-shaped that described pressure permeation tests prefabricated test block 1.Be of a size of upper base 175mm, go to the bottom 185mm, high 150mm, and it is 6mm that diameter is left in test block center, the cylindrical cavity 2 of up/down perforation.The pressure needed for test is regulated by the tensimeter 14 of nitrogen cylinder 12 bottle mouth position and the pressure regulating valve of bottom.Nitrogen enters stainless steel water receiver 11 by pipeline, applies pressure, the concrete prefabricated test block 1 in fluid inflow pressure room 4 to liquid wherein, applies relevant pressure to its sidewall.Tensimeter 13 above water receiver 11 is shown force value in water receiver 11 compared with the force value in nitrogen cylinder 12 exit, can whether leak gas by verification system.So this pressure apparatus can provide high and stable pressure for test, independent control is carried out to each test block, facilitates the setting of test.
The concrete infiltration method for testing of physical simulation submerged tunnel environment, operation steps:
The first step: first pressure chamber base is dried, put silicagel pad, concrete test block 1 clean for prior surface wipes is placed on silica gel pad, test block 1 upper surface also puts the same silica gel pad of size 3, finally cover stainless-steel sheet 5, tighten the fixed screw on top;
Second step: the valve opening water receiver 11 bottom, with water pump by water suction water receiver 11; Open two valves between nitrogen cylinder 12 and water receiver 11, and open nitrogen cylinder 12, be adjusted to required pressure, guarantee that water receiver tensimeter 13 is consistent with the reading of nitrogen pressure table 14;
3rd step: the inlet valve 9 opening pressure chamber 4 after pressure stability, starts test;
4th step: after completing test to the schedule time, closing presure room 4 inlet valve 9, take out test block 1, on pressure testing machine, centrally rive in duct;
5th step: measure length of penetration with vernier caliper after riving, average.
According to the operating condition of test of setting, finally obtain the test findings of moisture penetration, after moisture permeates the corresponding time in concrete, by test block centrally circular hole rive, the moisture penetration path profile obtained, with vernier caliper, corresponding length of penetration is measured at a certain distance to each test block, and then averages, obtain the length of penetration of moisture under this operating mode.
Claims (6)
1. the instrument of tunnel concrete water pressure permeability test under Simulated Water, is characterized in that: comprise nitrogen cylinder (12), stainless steel water receiver (11), pressure chamber (4), pressure regulating valve (9) and pipeline (10); Nitrogen cylinder (12) provides pressure, regulates the pressure needed for test by the tensimeter (14) of bottle mouth position and the pressure regulating valve of bottom; Nitrogen enters stainless steel water receiver (11) by pipeline (10), applies pressure, the concrete prefabricated test block (1) in fluid inflow pressure room (4) to liquid wherein, applies relevant pressure to its sidewall; Force value in the tensimeter (13) display water receiver (11) of water receiver (11) top; Have 4 pressure chambers (4), once can to 4 test block (1) pressurizations, each pressure chamber (4) have independently inlet valve (9); There is through reserved cylinder water-feeding hole (2) in the middle of prefabricated test block (1), during test, cylindrical cavity (2) is aimed at the water-feeding hole (2) of bottom, pressure chamber (4).
2. the instrument of tunnel concrete water pressure permeability test under Simulated Water according to claim 1, is characterized in that: described pressure chamber (4) are only provided with water-feeding hole (2) at bottom centre position.
3. the instrument of tunnel concrete water pressure permeability test under Simulated Water according to claim 1, is characterized in that: in described pressure chamber (4), prefabricated test block (1) has silica gel pad (3) and lower gasket center drilling up and down respectively.
4. the instrument of tunnel concrete water pressure permeability test under Simulated Water according to claim 1, it is characterized in that: described pressure chamber (4) are stamped stainless-steel sheet (5), fix with six roots of sensation lever (6), for cylindrical coil fastening-type pressure chamber, its surrounding is transparent plastic locular wall.
5. the instrument of tunnel concrete water pressure permeability test and test method thereof under Simulated Water according to claim 1, is characterized in that: it is truncated cone-shaped that described pressure permeation tests prefabricated test block (1).
6. the test method of the instrument of tunnel concrete water pressure permeability test under Simulated Water described in claim 1, is characterized in that: comprise the steps:
The first step: first pressure chamber base is dried, put silicagel pad, concrete test block (1) clean for prior surface wipes is placed on silica gel pad, test block (1) upper surface also puts the same silica gel pad of size (3), finally cover stainless-steel sheet (5), tighten the fixed screw on top;
Second step: the valve opening water receiver (11) bottom, with water pump by water suction water receiver (11); Open two valves between nitrogen cylinder (12) and water receiver (11), and open nitrogen cylinder (12), be adjusted to required pressure, guarantee that water receiver tensimeter (13) is consistent with the reading of nitrogen pressure table (14);
3rd step: the inlet valve (9) opening pressure chamber (4) after pressure stability, starts test;
4th step: after completing test to the schedule time, closing presure room (4) inlet valve (9), take out test block (1), on pressure testing machine, centrally rive in duct;
5th step: measure length of penetration with vernier caliper after riving, average.
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Cited By (5)
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| CN105334179A (en) * | 2015-11-12 | 2016-02-17 | 中南林业科技大学 | Spectrum detection device and method for penetration depth of adhesives on conglutination interface of wood materials |
| CN106840998A (en) * | 2017-01-06 | 2017-06-13 | 浙江大学城市学院 | The concrete pressure infiltration experiment device and its operating method of a kind of water temp adjustable |
| CN106989999A (en) * | 2017-05-15 | 2017-07-28 | 中铁隧道集团有限公司 | A kind of tunnel water pressure intelligent control test device |
| CN107515074A (en) * | 2017-08-03 | 2017-12-26 | 立方通达实业（天津）有限公司 | Compressive sealed property detection device and detection method after a kind of repairing concrete crack |
| CN108152121A (en) * | 2018-01-17 | 2018-06-12 | 中国科学院武汉岩土力学研究所 | A kind of concrete accelerated erosion device for applying flowing water and high water head pressure |
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| CN106989999A (en) * | 2017-05-15 | 2017-07-28 | 中铁隧道集团有限公司 | A kind of tunnel water pressure intelligent control test device |
| CN107515074A (en) * | 2017-08-03 | 2017-12-26 | 立方通达实业（天津）有限公司 | Compressive sealed property detection device and detection method after a kind of repairing concrete crack |
| CN108152121A (en) * | 2018-01-17 | 2018-06-12 | 中国科学院武汉岩土力学研究所 | A kind of concrete accelerated erosion device for applying flowing water and high water head pressure |
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