CN104897884A - Formwork side pressure testing device and method for grouting filling material under self-weight load - Google Patents
Formwork side pressure testing device and method for grouting filling material under self-weight load Download PDFInfo
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- CN104897884A CN104897884A CN201510334179.9A CN201510334179A CN104897884A CN 104897884 A CN104897884 A CN 104897884A CN 201510334179 A CN201510334179 A CN 201510334179A CN 104897884 A CN104897884 A CN 104897884A
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Abstract
The invention discloses a formwork side pressure testing device and method for grouting filling material under self-weight load. The device comprises a test box, a side pressure data acquisition system and a test box deformation measurement support, wherein the test box adopts a cuboid structure, side walls of the test box are sealed, and the upper part and the lower part of the test box are open; a lower opening of the test box is connected with a lower cover plate in a sealed manner; the side pressure data acquisition system comprises multiple pressure sensors, a pressure inspection instrument and a power supply; the test box deformation measurement support comprises a first fixing support and a second fixing support, a horizontal steel wire rope is connected between a first connection ring on the first fixing support and a second connection ring on the second fixing support, a plumb line is connected to the horizontal steel wire rope, and a mass block is connected at the bottom of the plumb line. The invention further discloses the formwork side pressure testing method for the grouting filling material under the self-weight load. The device and method are reasonable in design, convenient to use, operate and popularize, low in cost, safe and reliable to use and high in practicability, and recycling can be realized.
Description
Technical field
The invention belongs to mine expansion filling technical field of construction, be specifically related to a kind of form lateral pressure proving installation from heavy load bet slurry compaction material and method.
Background technology
Coal mine down-hole tunnel confined space expansion filling becomes the best mode of underground coal mine fire extinguishing Air leakage control gradually, build with traditional expanded material, compared with thick loess grouting, under heavy load, expansion filling material creates larger lateral pressure to template, thus result in a series of problem, as swollen mould, burst-mode and malformation etc.The application example of airtight filling and injecting slurry increases gradually in recent years, and the flowing property of cement foaming material is better, and it is more remarkable on the impact of the lateral pressure of template that this makes newly to water cement grout.At present, the test of template lateral pressure or the physical dimension of site test mostly by reality on plank sheathing are measured, and for higher filling and injecting slurry position, during construction, often adopt placement layer by layer, be difficult to so objectively reflect maximum lateral pressure value.In addition, the lateral pressure measurement cost of carrying out physical size is larger, and often some measuring equipment is stayed in obturation and is difficult to take out at the end of test, causes very large resource and waste of material.
Summary of the invention
Technical matters to be solved by this invention is for above-mentioned deficiency of the prior art, provide a kind of structure simple, realize convenient and cost is low, it is easy to operate, safe and reliable to use and can be cycled to repeat utilizations, the practical form lateral pressure proving installation starching compaction material from heavy load bet.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of form lateral pressure proving installation from heavy load bet slurry compaction material, it is characterized in that: comprise be made up of tempered glass chamber, lateral pressure data acquisition system (DAS) and chamber deformation measurement support, described chamber is the cube structure of sidewall sealing, upper and lower opening, and the lower opening of described chamber is sealedly connected with lower cover; Described lateral pressure data acquisition system (DAS) comprises multiple being evenly arranged on chamber sidewall and the pressure transducer stretching into chamber inside and the pressure logging be all connected with the output terminal of multiple pressure transducer, and the power supply for powering for multiple pressure transducer and pressure logging, the surface that described pressure transducer stretches into chamber interior section is mutually concordant with the inner wall surface of chamber; Described chamber deformation measurement support comprises the first fixed support and the second fixed support, described first fixed support is fixedly connected with the first abutment ring, described second fixed support is fixedly connected with the second abutment ring, described first abutment ring and the second abutment ring are positioned at sustained height place, the minimum point of described first abutment ring and the minimum point of the second abutment ring are all higher than the height of chamber, horizontal wire rope is connected with between described first abutment ring and the second abutment ring, described horizontal wire rope is connected with pedal line, bottom described pedal line, is connected with mass.
The above-mentioned form lateral pressure proving installation from heavy load bet slurry compaction material, it is characterized in that: the quantity making the tempered glass of chamber is four pieces, the thickness of four blocks of described tempered glass is 6mm ~ 10mm, two blocks of adjacent tempered glass are fixedly connected with by clip, and the seam of two blocks of adjacent tempered glass is sealed by glass cement.
The above-mentioned form lateral pressure proving installation from heavy load bet slurry compaction material, it is characterized in that: described lower cover is fixedly connected with chamber by bolt, the seam of described lower cover and chamber is sealed by glass cement.
The above-mentioned form lateral pressure proving installation from heavy load bet slurry compaction material, is characterized in that: the thickness of described lower cover is 5mm ~ 20mm.
The above-mentioned form lateral pressure proving installation from heavy load bet slurry compaction material, is characterized in that: the minimum point of described first abutment ring and the minimum point of the second abutment ring are all than the height height 3cm ~ 10cm of chamber.
The above-mentioned form lateral pressure proving installation from heavy load bet slurry compaction material, is characterized in that: described first abutment ring and the second abutment ring are the iron annulus that diameter is 1cm ~ 3cm.
The above-mentioned form lateral pressure proving installation from heavy load bet slurry compaction material, is characterized in that: the quantity of described pressure transducer is six, and six described pressure transducers are flat-die pressure transducer.
Present invention also offers the form lateral pressure method of testing that a kind of method step is simple, realize starching from heavy load bet easily compaction material, it is characterized in that the method comprises the following steps:
Step one, employing grouting equipment pour into expanded foamed material in chamber, until the expanded foamed material height of perfusion is concordant with the coboundary of chamber;
Step 2, in the process of step one, the per interval T of described pressure logging
1gather and record the pressure data that multiple pressure transducer detects;
Step 3, poured into after, the per interval T of described pressure logging
2gather and record the pressure data that multiple pressure transducer detects, till variable quantity is less than 0.01Pa ~ 0.1Pa compared with the pressure data that the pressure data of the multiple pressure transducers collected until described pressure logging all collects with the last time.
Above-mentioned method, is characterized in that: after step 3, leaves standstill the expanded foamed material 0.5h ~ 2h be filled in chamber, and then adopt chamber deformation measurement support to measure transversely deforming amount and the longitudinal deformation amount of chamber, concrete process is:
Step 401, the first fixed support and the second fixed support are placed on respectively the both sides of chamber, and regulate the link position of horizontal wire rope and the first abutment ring and the second abutment ring, make horizontal wire rope mutually concordant with the horizontal edge of chamber, and make the tie point of pedal line and horizontal wire rope be close to chamber;
Step 402, regulate the link position of pedal line on horizontal wire rope, make pedal line be close to the most salient point of lateral wall of chamber;
Step 403, the translation distance of measurement pedal line on horizontal wire rope, namely measure the transversely deforming amount obtaining chamber;
Step 404, regulate the link position of horizontal wire rope and the first abutment ring and the second abutment ring, make horizontal wire rope be close to the peak of solidification expanded foamed material afterwards;
Step 405, the upper and lower translation height of measurement horizontal wire rope on the first abutment ring or the second abutment ring, namely measure the longitudinal deformation amount obtaining chamber.
Above-mentioned method, it is characterized in that: when adopting grouting equipment to pour into expanded foamed material in step one in chamber, the grouting pipe of grouting equipment exports the alignment test case one side relative with setting pressure sensor, and the flow velocity of described expanded foamed material is 1m/s; T in step 2
1value be 1min, T in step 3
2value be 3min.
The present invention compared with prior art has the following advantages:
1, the present invention is simple, reasonable in design from the structure of the form lateral pressure proving installation of heavy load bet slurry compaction material, and realization is convenient and cost is low.
2, the present invention is when the form lateral pressure proving installation of heavy load bet slurry compaction material uses, without the need to charger, when producing lateral pressure to test wall after injection compaction material under upper strata compaction material gravity and self gravitation effect, be used for simulating expanded material expand after for the destructiveness of confined space template, use easy to operate.
3, the present invention after filling expanded foamed material by simulation test case not in the same time expanded foamed material to the distortion tested after the lateral pressure of wall and expanded foamed material cured, the destructiveness of grouting filling material to underground airtight space template can be obtained, economical, high efficiencyly can measure the grouting filling material of different ratio and different position height to the impact of template lateral pressure.
4, the present invention starches the safe and reliable of the form lateral pressure proving installation of compaction material from heavy load bet, and can be cycled to repeat utilization, economic environmental protection.
5, the present invention is simple from the method step of the form lateral pressure method of testing of heavy load bet slurry compaction material, and it is convenient to realize.
6, of the present invention practical, result of use is good, is convenient to promote the use of.
In sum, the present invention is reasonable in design, and realization is convenient and cost is low, uses easy to operate, safe and reliable, and can be cycled to repeat utilization, and practical, result of use is good, is convenient to promote the use of.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention from the form lateral pressure proving installation of heavy load bet slurry compaction material.
Description of reference numerals:
1-chamber; 2-lower cover; 3-pressure transducer;
4-pressure logging; 5-power supply; 6-the first fixed support;
7-the second fixed support; 8-the first abutment ring; 9-the second abutment ring;
10-horizontal wire rope; 11-pedal line; 12-mass.
Embodiment
As shown in Figure 1, form lateral pressure proving installation from heavy load bet slurry compaction material of the present invention, comprise be made up of tempered glass chamber 1, lateral pressure data acquisition system (DAS) and chamber deformation measurement support, described chamber 1 is the cube structure of sidewall sealing, upper and lower opening, and the lower opening of described chamber 1 is sealedly connected with lower cover 2, described lateral pressure data acquisition system (DAS) comprises multiple being evenly arranged on chamber 1 sidewall and the pressure transducer 3 stretching into chamber 1 inside and the pressure logging 4 be all connected with the output terminal of multiple pressure transducer 3, and the power supply 5 for powering for multiple pressure transducer 3 and pressure logging 4, the surface that described pressure transducer 3 stretches into chamber 1 interior section is mutually concordant with the inner wall surface of chamber 1, can make pressure transducer 3 and expanded foamed material good contact, described chamber deformation measurement support comprises the first fixed support 6 and the second fixed support 7, described first fixed support 6 is fixedly connected with the first abutment ring 8, described second fixed support 7 is fixedly connected with the second abutment ring 9, described first abutment ring 8 and the second abutment ring 9 are positioned at sustained height place, the minimum point of described first abutment ring 8 and the minimum point of the second abutment ring 9 are all higher than the height of chamber 1, horizontal wire rope 10 is connected with between described first abutment ring 8 and the second abutment ring 9, described horizontal wire rope 10 is connected with pedal line 11, mass 12 is connected with bottom described pedal line 11.
As shown in Figure 1, in the present embodiment, the quantity making the tempered glass of chamber 1 is four pieces, and the thickness of four blocks of described tempered glass is 6mm ~ 10mm, two blocks of adjacent tempered glass are fixedly connected with by clip, and the seam of two blocks of adjacent tempered glass is sealed by glass cement.During concrete enforcement, wherein the length of two blocks of tempered glass and width are 1m, and the length of another two blocks of tempered glass is 1m, and width is 0.983m, and the thickness of four blocks of described tempered glass is all preferably 8mm.
In the present embodiment, described lower cover 2 is fixedly connected with chamber 1 by bolt, and described lower cover 2 is sealed by glass cement with the seam of chamber 1.The thickness of described lower cover 2 is 5mm ~ 20mm.During concrete enforcement, length and the width of described lower cover 2 are 1.4m, and the thickness of described lower cover 2 is preferably 10mm.
As shown in Figure 1, in the present embodiment, the minimum point of described first abutment ring 8 and the minimum point of the second abutment ring 9 are all than the height height 3cm ~ 10cm of chamber 1.Preferably, the minimum point of described first abutment ring 8 and the minimum point of the second abutment ring 9 are all than the height height 5cm of chamber 1.Described first abutment ring 8 and the second abutment ring 9 are the iron annulus that diameter is 1cm ~ 3cm.Preferably, the diameter of described first abutment ring 8 and the second abutment ring 9 is 2cm.
During concrete enforcement, described pressure transducer 3 is sealed by glass cement with the seam of chamber 1 sidewall.The height of described first fixed support 6 and the second fixed support 7 is 1.2m, and the length of described horizontal wire rope 10 is 1.2m,
As shown in Figure 1, in the present embodiment, the quantity of described pressure transducer 3 is six, and six described pressure transducers 3 are flat-die pressure transducer.The surface that described pressure transducer 3 stretches into chamber 1 interior section is pressure transducer 3 flat-die surface.During concrete enforcement, the range of six described pressure transducers 3 is 0 ~ 2MPa, and six described pressure transducers 3 all have employed BW type foil micro pressure box.
Form lateral pressure method of testing from heavy load bet slurry compaction material of the present invention, comprises the following steps:
Step one, employing grouting equipment pour into expanded foamed material in chamber 1, until the expanded foamed material height of perfusion is concordant with the coboundary of chamber 1;
In the present embodiment, when adopting grouting equipment to pour into expanded foamed material in step one in chamber 1, the grouting pipe of grouting equipment exports alignment test case 1 one side relative with setting pressure sensor 3, and the flow velocity of described expanded foamed material is 1m/s; Because pressure transducer 3 flat-die is relatively rich, run into hard object or acrimonious material very easily scratches, therefore, the flow velocity of expanded foamed material is strictly controlled when pouring into expanded foamed material, and make the grouting pipe of grouting equipment export alignment test case 1 one side relative with setting pressure sensor 3, to the pressure that chamber 1 sidewall produces when can simulate expanded foamed material expansion exactly and after solidification, and extend the serviceable life of pressure transducer 3.
Step 2, in the process of step one, the per interval T of described pressure logging 4
1gather and record the pressure data that multiple pressure transducer 3 detects;
In the present embodiment, T in step 2
1value be 1min;
Step 3, poured into after, the per interval T of described pressure logging 4
2gather and record the pressure data that multiple pressure transducer 3 detects, till variable quantity is less than 0.01pa ~ 0.1pa compared with the pressure data that the pressure data of the multiple pressure transducers 3 collected until described pressure logging 4 all collects with the last time.Compared with the pressure data that the pressure data of multiple pressure transducers 3 that described pressure logging 4 collects all collects with the last time, variable quantity is less than 0.01Pa ~ 0.1Pa, namely the data that described pressure logging 4 collects no longer produce obvious change, illustrate that the expanded foamed material of perfusion solidifies completely.
In the present embodiment, T in step 3
2value be 3min.
After step 3, leave standstill the expanded foamed material 0.5h ~ 2h be filled in chamber 1, then adopt chamber deformation measurement support to measure transversely deforming amount and the longitudinal deformation amount of chamber 1, concrete process is:
Step 401, the first fixed support 6 and the second fixed support 7 are placed on respectively the both sides of chamber 1, and regulate the link position of horizontal wire rope 10 and the first abutment ring 8 and the second abutment ring 9, make horizontal wire rope 10 mutually concordant with the horizontal edge of chamber 1, and make pedal line 11 be close to chamber 1 with the tie point of horizontal wire rope 10;
Step 402, regulate the link position of pedal line 11 on horizontal wire rope 10, make pedal line 11 be close to the most salient point of lateral wall of chamber 1;
Step 403, the translation distance of measurement pedal line 11 on horizontal wire rope 10, namely measure the transversely deforming amount obtaining chamber 1;
Step 404, regulate the link position of horizontal wire rope 10 and the first abutment ring 8 and the second abutment ring 9, make horizontal wire rope 10 be close to the peak of solidification expanded foamed material afterwards;
Step 405, the upper and lower translation height of measurement horizontal wire rope 10 on the first abutment ring 8 or the second abutment ring 9, namely measure the longitudinal deformation amount obtaining chamber 1.
After off-test, by checking the data that pressure logging 4 described in step 2 and step 3 records, just can know not in the same time expanded foamed material to the lateral pressure of chamber 1 sidewall, the longitudinal deformation amount of chamber 1 after the expanded foamed material cured obtained in the transversely deforming amount of chamber 1 after the expanded foamed material cured obtained in integrating step 403 again and step 405, just can study the destructiveness of grouting filling material to underground airtight space template.
By the test of above method, the grouting filling material of different ratio and different position height economical, high efficiencyly can be measured on the impact of template lateral pressure.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure change, all still belong in the protection domain of technical solution of the present invention.
Claims (10)
1. the form lateral pressure proving installation from heavy load bet slurry compaction material, it is characterized in that: comprise be made up of tempered glass chamber (1), lateral pressure data acquisition system (DAS) and chamber deformation measurement support, described chamber (1) is the cube structure of sidewall sealing, upper and lower opening, and the lower opening of described chamber (1) is sealedly connected with lower cover (2), described lateral pressure data acquisition system (DAS) comprises multiple being evenly arranged on chamber (1) sidewall and the pressure logging (4) stretching into the inner pressure transducer (3) of chamber (1) and be all connected with the output terminal of multiple pressure transducer (3), and the power supply (5) for powering for multiple pressure transducer (3) and pressure logging (4), the surface that described pressure transducer (3) stretches into chamber (1) interior section is mutually concordant with the inner wall surface of chamber (1), described chamber deformation measurement support comprises the first fixed support (6) and the second fixed support (7), described first fixed support (6) is fixedly connected with the first abutment ring (8), described second fixed support (7) is fixedly connected with the second abutment ring (9), described first abutment ring (8) and the second abutment ring (9) are positioned at sustained height place, the minimum point of described first abutment ring (8) and the minimum point of the second abutment ring (9) are all higher than the height of chamber (1), horizontal wire rope (10) is connected with between described first abutment ring (8) and the second abutment ring (9), described horizontal wire rope (10) is connected with pedal line (11), described pedal line (11) bottom is connected with mass (12).
2. according to the form lateral pressure proving installation from heavy load bet slurry compaction material according to claim 1, it is characterized in that: the quantity making the tempered glass of chamber (1) is four pieces, the thickness of four blocks of described tempered glass is 6mm ~ 10mm, two blocks of adjacent tempered glass are fixedly connected with by clip, and the seam of two blocks of adjacent tempered glass is sealed by glass cement.
3. according to the form lateral pressure proving installation from heavy load bet slurry compaction material according to claim 1, it is characterized in that: described lower cover (2) is fixedly connected with chamber (1) by bolt, described lower cover (2) is sealed by glass cement with the seam of chamber (1).
4., according to the form lateral pressure proving installation from heavy load bet slurry compaction material according to claim 1, it is characterized in that: the thickness of described lower cover (2) is 5mm ~ 20mm.
5., according to the form lateral pressure proving installation from heavy load bet slurry compaction material according to claim 1, it is characterized in that: the minimum point of described first abutment ring (8) and the minimum point of the second abutment ring (9) are all than the height height 3cm ~ 10cm of chamber (1).
6., according to the form lateral pressure proving installation from heavy load bet slurry compaction material according to claim 1, it is characterized in that: described first abutment ring (8) and the second abutment ring (9) are the iron annulus that diameter is 1cm ~ 3cm.
7. according to the form lateral pressure proving installation from heavy load bet slurry compaction material according to claim 1, it is characterized in that: the quantity of described pressure transducer (3) is six, six described pressure transducers (3) are flat-die pressure transducer.
8. utilize device as claimed in claim 1 to carry out a method for the form lateral pressure test from heavy load bet slurry compaction material, it is characterized in that the method comprises the following steps:
Step one, the employing grouting equipment expanded foamed material of perfusion in chamber (1), until the expanded foamed material height of perfusion is concordant with the coboundary of chamber (1);
Step 2, in the process of step one, the per interval T of described pressure logging (4)
1gather and record the pressure data that multiple pressure transducer (3) detects;
Step 3, poured into after, the per interval T of described pressure logging (4)
2gather and record the pressure data that multiple pressure transducer (3) detects, till variable quantity is less than 0.01Pa ~ 0.1Pa compared with the pressure data that the pressure data of the multiple pressure transducers (3) collected until described pressure logging (4) all collects with the last time.
9. in accordance with the method for claim 8, it is characterized in that: after step 3, leave standstill the expanded foamed material 0.5h ~ 2h be filled in chamber (1), then adopt chamber deformation measurement support to measure transversely deforming amount and the longitudinal deformation amount of chamber (1), concrete process is:
Step 401, the first fixed support (6) and the second fixed support (7) are placed on respectively the both sides of chamber (1), and regulate the link position of horizontal wire rope (10) and the first abutment ring (8) and the second abutment ring (9), make horizontal wire rope (10) mutually concordant with the horizontal edge of chamber (1), and make pedal line (11) be close to chamber (1) with the tie point of horizontal wire rope (10);
Step 402, regulate pedal line (11) link position on horizontal wire rope (10), make pedal line (11) be close to the most salient point of lateral wall of chamber (1);
Step 403, measurement pedal line (11) translation distance on horizontal wire rope (10), namely measure the transversely deforming amount obtaining chamber (1);
Step 404, regulate the link position of horizontal wire rope (10) and the first abutment ring (8) and the second abutment ring (9), make horizontal wire rope (10) be close to the peak of solidification expanded foamed material afterwards;
Step 405, measurement horizontal wire rope (10) the upper and lower translation height on the first abutment ring (8) or the second abutment ring (9), namely measure the longitudinal deformation amount obtaining chamber (1).
10. in accordance with the method for claim 8, it is characterized in that: when adopting grouting equipment to pour into expanded foamed material in step one in chamber (1), the grouting pipe of grouting equipment exports alignment test case (1) one side relative with setting pressure sensor (3), and the flow velocity of described expanded foamed material is 1m/s; T in step 2
1value be 1min, T in step 3
2value be 3min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510334179.9A CN104897884B (en) | 2015-06-17 | 2015-06-17 | Form lateral pressure method of testing from heavy load bet slurry filler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510334179.9A CN104897884B (en) | 2015-06-17 | 2015-06-17 | Form lateral pressure method of testing from heavy load bet slurry filler |
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| Publication Number | Publication Date |
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| CN104897884A true CN104897884A (en) | 2015-09-09 |
| CN104897884B CN104897884B (en) | 2016-06-29 |
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| JP2006112927A (en) * | 2004-10-15 | 2006-04-27 | Penta Ocean Constr Co Ltd | Test specimen for confirming filling properties of concrete |
| CN203310562U (en) * | 2013-06-27 | 2013-11-27 | 南京工业大学 | Device for directly measuring concrete lateral pressure |
| CN203310701U (en) * | 2013-06-21 | 2013-11-27 | 南京工业大学 | Lateral pressure testing device |
| CN203422184U (en) * | 2013-09-16 | 2014-02-05 | 南京工业大学 | Device for simulating template surface friction to study concrete lateral pressure |
| CN104251801A (en) * | 2014-09-12 | 2014-12-31 | 上海建工集团股份有限公司 | Test device for measuring lateral pressure of concrete template |
| CN104391106A (en) * | 2014-12-09 | 2015-03-04 | 中国建筑材料科学研究总院 | Instrument for measuring restrained expansion rate and initial setting time of expansive concrete |
| CN204679497U (en) * | 2015-06-17 | 2015-09-30 | 西安科技大学 | A kind of form lateral pressure proving installation of grouting filling material |
-
2015
- 2015-06-17 CN CN201510334179.9A patent/CN104897884B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006112927A (en) * | 2004-10-15 | 2006-04-27 | Penta Ocean Constr Co Ltd | Test specimen for confirming filling properties of concrete |
| CN203310701U (en) * | 2013-06-21 | 2013-11-27 | 南京工业大学 | Lateral pressure testing device |
| CN203310562U (en) * | 2013-06-27 | 2013-11-27 | 南京工业大学 | Device for directly measuring concrete lateral pressure |
| CN203422184U (en) * | 2013-09-16 | 2014-02-05 | 南京工业大学 | Device for simulating template surface friction to study concrete lateral pressure |
| CN104251801A (en) * | 2014-09-12 | 2014-12-31 | 上海建工集团股份有限公司 | Test device for measuring lateral pressure of concrete template |
| CN104391106A (en) * | 2014-12-09 | 2015-03-04 | 中国建筑材料科学研究总院 | Instrument for measuring restrained expansion rate and initial setting time of expansive concrete |
| CN204679497U (en) * | 2015-06-17 | 2015-09-30 | 西安科技大学 | A kind of form lateral pressure proving installation of grouting filling material |
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