CN109706986A - A kind of detection device and detection method about the evaluation of load box grouting behind shaft or drift lining compression strength - Google Patents
A kind of detection device and detection method about the evaluation of load box grouting behind shaft or drift lining compression strength Download PDFInfo
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- CN109706986A CN109706986A CN201910129333.7A CN201910129333A CN109706986A CN 109706986 A CN109706986 A CN 109706986A CN 201910129333 A CN201910129333 A CN 201910129333A CN 109706986 A CN109706986 A CN 109706986A
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- 238000012360 testing method Methods 0.000 claims abstract description 202
- 238000007569 slipcasting Methods 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 5
- 230000000452 restraining effect Effects 0.000 claims description 13
- 238000000465 moulding Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 9
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- 238000012545 processing Methods 0.000 claims description 5
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- 238000007789 sealing Methods 0.000 claims description 3
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- 235000006508 Nelumbo nucifera Nutrition 0.000 claims description 2
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 1
- 238000009955 starching Methods 0.000 claims 1
- 238000011065 in-situ storage Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 241000209094 Oryza Species 0.000 description 4
- 235000007164 Oryza sativa Nutrition 0.000 description 4
- VIKNJXKGJWUCNN-XGXHKTLJSA-N norethisterone Chemical compound O=C1CC[C@@H]2[C@H]3CC[C@](C)([C@](CC4)(O)C#C)[C@@H]4[C@@H]3CCC2=C1 VIKNJXKGJWUCNN-XGXHKTLJSA-N 0.000 description 4
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- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention belongs to architecture engineering material quality detection device technical fields, and in particular to a kind of detection device and its detection method about the evaluation of load box grouting behind shaft or drift lining compression strength.Detection device includes load box grouting behind shaft or drift lining equipment, grouting pipeline, overfall pipeline and slip casting load box；The slurries delivery outlet of load box grouting behind shaft or drift lining equipment is connect by grouting pipeline with slip casting load box；Overfall pipeline is connect with slip casting load box.Apparatus of the present invention are simple and convenient to operate, and safety is good, practical.Device through the invention, target cylinder test specimen needed for can quickly and easily obtaining follow-up test.Detection method, which can be realized, treats the easy, quick of test block compression strength, Accurate Determining.The concrete sample obtained through the invention, compression strength can compared with objective reality reflect the performance of cast-in-situ concrete member, to provide reliable foundation for foundation pile self-balanced pile test grouting behind shaft or drift lining compression strength detecting appraisal in industry.
Description
Technical field
The invention belongs to architecture engineering material quality detection device technical fields, and in particular to a kind of about infusing after load box
Starch the detection device and its detection method of compression strength evaluation.
Background technique
Nowadays, foundation pile self-balanced static-load testing technology has become test of bearing capacity side most widely used in current pile measurement
Method, however when carrying out self-balanced static-load testing, load box can generate unpredictalbe gap tomography after opening inside it, make
At broken pile, quality of the test pile for engineering pile is influenced, causes hidden danger of quality, it is therefore desirable to carry out self-balanced static-load testing grouting behind shaft or drift lining
Cement grout injection is filled at the gap tomography formed after load box is opened by operation, to eliminate the pile breaking phenomenon after test,
Effectively connection load box two sections stake, it is ensured that pile foundation pile strength and pile body integrity.However, being completed in grouting behind shaft or drift lining operation
Afterwards, how the compression strength for the concrete sample that filling displacement is formed in load box cylinder body at above-mentioned gap tomography is detected
It evaluates, also lacks a kind of effective method so far in industry.
Concrete crushing strength detection in China's is usually to be measured with the compression strength foundation of standardized test sample of maintenance.
But it has to be noticed that the compression test of concrete standard curing member is for structural concrete, a kind of only indirect determination value.Due to examination
Condition of molding, curing condition and the stress of part be impossible to it is completely the same with the concrete on entity structure object, therefore, examination
Part measured value can only be considered the performance reflection of concrete under given conditions, and compression strength can not really reflection structure mix
Coagulate the performance of soil.
Summary of the invention
The purpose of the present invention is to provide a kind of detection devices and detection about the evaluation of load box grouting behind shaft or drift lining compression strength
Method can preferably improve the pressure resistance of the reserved concrete standard maintenance test specimen and cured under same condition test specimen that are widely used at present
Deviation caused by the practical compression strength of detecting appraisal cast-in-situ concrete member is spent, is foundation pile self-balanced pile test grouting behind shaft or drift lining in industry
Compression strength detecting appraisal provides reliable foundation.
The present invention to achieve the goals above, adopts the following technical scheme that
A kind of detection device about the evaluation of load box grouting behind shaft or drift lining compression strength, which includes load box grouting behind shaft or drift lining
Equipment, grouting pipeline, overfall pipeline and slip casting load box；
The slurries delivery outlet of load box grouting behind shaft or drift lining equipment is connect by grouting pipeline with slip casting load box；
Overfall pipeline is connect with slip casting load box.
Further, the latus rectum of grouting pipeline is DN25, and the latus rectum of overfall pipeline is DN6 or DN8；Grouting pipeline and overfall
Pipeline is fastened using being threadedly coupled and is sealed equipped with sealing element.
Further, grouting pipeline and overfall pipeline are made of high pressure wire braided hose, and grouting pipeline and overfall
The hose coupling of pipeline uses attaching type.And inlet tube maximum working pressure (MWP) is not less than 60MPa, Grouting Pipe maximum working pressure (MWP) is not
Less than 35MPa, the regulation of Ying Fuhe JB/T8727-2004 and GB/T9065.5-2010.
Further, high pressure wire braided hose is two layers or compound steel silk winding arrangement.
It abolishes before carrying out test specimen intensity test under constraint condition, the cylinder that will should be taken out in jack cylinder body as required
Body test specimen is made specification Φ 100x100mm, test specimen upper and lower end face polish processing and with outer circle verticality≤0.1mm.
This detection device makees working media using water or air.
The test of load box grouting behind shaft or drift lining is carried out by simulation operating condition, target cylinder test specimen is produced after molding.With batch slip casting
Liquid test specimen produces target test specimen group number and is no less than 2 groups, and every group of target test specimen is 3, and the target test specimen compression strength obtained is equal
Should carry out as required following two mode detection: (i.e. target test specimen is in slip casting load box jack cylinder body under with constraint conditions
It is interior) it target test specimen intensity test and abolishes under constraint condition and (takes out test specimen out of slip casting load box jack cylinder body) and is anti-
Compressive Strength test.
A kind of detection method of the detection device about the evaluation of load box grouting behind shaft or drift lining compression strength, which includes such as
Lower step:
Intensity test is carried out to target cylinder test specimen with electric-liquid type pressure test machine；
1) it is tested under with constraint conditions
(1) first belt restraining surface of test piece wiped clean is measured size, and checks its appearance；Dimensional measurement is accurate to 1 milli
Rice, and the bearing area of belt restraining test specimen is calculated accordingly；
(2) belt restraining test specimen is placed on the lower platen of pressure testing machine, the top surface when pressure-bearing surface of test specimen and molding
Vertically；The center of test specimen should be aligned with testing machine lower platen center；
(3) testing machine is started, when top board and test specimen are close, adjustment ball seat keeps contact balanced；Ying Lianxu when test and it is equal
The loading of even ground, loading speed are as follows:
As strength grade of concrete < C30,0.3-0.5MPa/s is taken；
When strength grade of concrete is between C30 and C60,0.5-0.8MPa/s is taken；
As strength grade of concrete >=C60,0.8-1.0MPa/s is taken；
(4) when loading to belt restraining test specimen settling amount reaches 60~80mm, and load is greater than same type agent on crack resistance of concrete pressure
When spending index, stop testing machine throttle, loading terminates, and records payload values at this time；
2) it abolishes and is tested under constraint condition
The test specimen taken out in jack cylinder body is made cylinder test specimen before test, test specimen upper and lower end face polish processing and with
Outer circle verticality≤0.1mm；
(1) first that test specimen surface wipes to be measured are clean, size is checked, and check its appearance；Dimensional measurement is accurate to 1 milli
Rice, and the bearing area of calculation testing piece accordingly；
(2) test specimen to be measured is placed on the lower platen of pressure testing machine, the top surface when pressure-bearing surface of test specimen and molding is hung down
Directly；The center of test specimen should be aligned with testing machine lower platen center；
(3) testing machine is started, when top board and test specimen are close, adjustment ball seat keeps contact balanced.Ying Lianxu when test and it is equal
The loading of even ground, loading speed are as follows:
As strength grade of concrete < C30,0.3-0.5MPa/s is taken；
When strength grade of concrete is between C30 and C60,0.5-0.8MPa/s is taken；
As strength grade of concrete >=C60,0.8-1.0MPa/s is taken；
(4) when loading to close destroy of test specimen starts deformation rapidly, stopping Adjustment Tests machine oil door, until test specimen is broken
It is bad；The failing load value of record at this time.
Further, step 2) is abolished under constraint condition in test:
The specification of cylinder test specimen is Φ 100x100mm, and its ratio of height to diameter is 1.
Further, it measures the ultimate load of each group target test specimen under with constraint conditions respectively by pressure testing machine and breaks
Except the failing load numerical value of each group target test specimen under constraint condition, using following calculation and analysis methods, belt restraining item is evaluated respectively
Under part and abolish the compression strength index of target test specimen under constraint condition；
1) target cylinder test specimen compression strength calculation formula: fcu=α F/A
In formula: fcu --- target cylinder test specimen compression strength (Mpa)；
α --- conversion coefficient；
F --- ultimate load/failing load (N)；
A --- test specimen bearing area (mm2)；
α is the experience conversion coefficient of Φ 100x100mm concrete cylindrical test specimen and standard cube test piece intensity, herein
Take 1.0；
Compression strength of concrete test parts calculating should be accurate to 0.1Mpa；
2) for every group of 3 test specimens in the production of load box grouting behind shaft or drift lining test site, molding, sampling, determining as follows should
The concrete crushing strength typical value of group test specimen:
(1) using the arithmetic mean of instantaneous value of three test specimen measured values as the compression strength value of this group of test specimen；
Maximum or minimum value in (2) three measured values, the difference if any one and median are more than the 15% of median, then
Maximum and minimum value gives up remove together, takes median as the compression strength value of this group of test specimen；
Maximum or minimum value in (3) three measured values as there are two 15% that the difference of measured value and median is more than median,
Then the test data of this group of test specimen is invalid.
The invention has the following advantages:
1, apparatus of the present invention are simple and convenient to operate, and safety is good, practical.
2, device through the invention, target cylinder test specimen needed for can quickly and easily obtaining follow-up test.
3, detection method, which can be realized, treats the easy, quick of test block compression strength, Accurate Determining.
4, the concrete sample obtained through the invention, compression strength can compared with objective reality reflect cast-in-place concrete structure
The performance of part, to provide reliable foundation for foundation pile self-balanced pile test grouting behind shaft or drift lining compression strength detecting appraisal in industry.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of detection device of the present invention.
Specific embodiment
Present invention will now be described in detail with reference to the accompanying drawings.:
Embodiment 1
The present embodiment is a kind of detection device about the evaluation of load box grouting behind shaft or drift lining compression strength, which includes lotus
Carry case grouting behind shaft or drift lining equipment 1, grouting pipeline 2, overfall pipeline 3 and slip casting load box 4；
The slurries delivery outlet of load box grouting behind shaft or drift lining equipment 1 is connect by grouting pipeline 2 with slip casting load box 4；
Overfall pipeline 3 is connect with slip casting load box 4.
The latus rectum of grouting pipeline 2 is DN25, and the latus rectum of overfall pipeline 3 is DN6 or DN8；Grouting pipeline 2 and overfall pipeline 3
It is fastened using being threadedly coupled and is sealed equipped with sealing element.
Grouting pipeline 2 and overfall pipeline 3 are made of high pressure wire braided hose, and grouting pipeline 2 and overfall pipeline 3
Hose coupling uses attaching type.Inlet tube maximum working pressure (MWP) is not less than 60MPa, and Grouting Pipe maximum working pressure (MWP) is not less than
The regulation of 35MPa, Ying Fuhe JB/T8727-2004 and GB/T9065.5-2010.
High pressure wire braided hose is two layers or compound steel silk winding arrangement.
It abolishes before carrying out test specimen intensity test under constraint condition, the cylinder that will should be taken out in jack cylinder body as required
Body test specimen is made specification Φ 100x100mm, test specimen upper and lower end face polish processing and with outer circle verticality≤0.1mm.
This detection device makees working media using water or air.
The test of load box grouting behind shaft or drift lining is carried out by simulation operating condition, target cylinder test specimen is produced after molding.With batch slip casting
Liquid test specimen produces target test specimen group number and is no less than 2 groups, and every group of target test specimen is 3, and the target test specimen compression strength obtained is equal
Should carry out as required following two mode detection: (i.e. target test specimen is in slip casting load box jack cylinder body under with constraint conditions
It is interior) it target test specimen intensity test and abolishes under constraint condition and (takes out test specimen out of slip casting load box jack cylinder body) and is anti-
Compressive Strength test.
Embodiment 2
The present embodiment is a kind of detection method of detection device about the evaluation of load box grouting behind shaft or drift lining compression strength.
The detection method includes the following steps:
Intensity test is carried out to target cylinder test specimen with electric-liquid type pressure test machine；
1) it is tested under with constraint conditions
(1) first belt restraining surface of test piece wiped clean is measured size, and checks its appearance；Dimensional measurement is accurate to 1 milli
Rice, and the bearing area of belt restraining test specimen is calculated accordingly；
(2) belt restraining test specimen is placed on the lower platen of pressure testing machine, the top surface when pressure-bearing surface of test specimen and molding
Vertically；The center of test specimen should be aligned with testing machine lower platen center；
(3) testing machine is started, when top board and test specimen are close, adjustment ball seat keeps contact balanced；Ying Lianxu when test and it is equal
The loading of even ground, loading speed are as follows:
As strength grade of concrete < C30,0.3-0.5MPa/s is taken；
When strength grade of concrete is between C30 and C60,0.5-0.8MPa/s is taken；
As strength grade of concrete >=C60,0.8-1.0MPa/s is taken；
(4) when loading to belt restraining test specimen settling amount reaches 60~80mm, and load is greater than same type agent on crack resistance of concrete pressure
When spending index, stop testing machine throttle, loading terminates, and records payload values at this time；
2) it abolishes and is tested under constraint condition
The test specimen taken out in jack cylinder body is made cylinder test specimen before test, test specimen upper and lower end face polish processing and with
Outer circle verticality≤0.1mm；
(1) first that test specimen surface wipes to be measured are clean, size is checked, and check its appearance；Dimensional measurement is accurate to 1 milli
Rice, and the bearing area of calculation testing piece accordingly；
(2) test specimen to be measured is placed on the lower platen of pressure testing machine, the top surface when pressure-bearing surface of test specimen and molding is hung down
Directly；The center of test specimen should be aligned with testing machine lower platen center；
(3) testing machine is started, when top board and test specimen are close, adjustment ball seat keeps contact balanced.Ying Lianxu when test and it is equal
The loading of even ground, loading speed are as follows:
As strength grade of concrete < C30,0.3-0.5MPa/s is taken；
When strength grade of concrete is between C30 and C60,0.5-0.8MPa/s is taken；
As strength grade of concrete >=C60,0.8-1.0MPa/s is taken；
(4) when loading to close destroy of test specimen starts deformation rapidly, stopping Adjustment Tests machine oil door, until test specimen is broken
It is bad；The failing load value of record at this time.
Step 2) is abolished under constraint condition in test:
The specification of cylinder test specimen is Φ 100x100mm, and its ratio of height to diameter is 1.
It measures the ultimate load of each group target test specimen under with constraint conditions respectively by pressure testing machine and abolishes constraint item
The failing load numerical value of each group target test specimen under part is evaluated under with constraint conditions and broken respectively using following calculation and analysis methods
Except the compression strength index of target test specimen under constraint condition；
2) target cylinder test specimen compression strength calculation formula: fcu=α F/A
In formula: fcu --- target cylinder test specimen compression strength (Mpa)；
α --- conversion coefficient；
F --- ultimate load/failing load (N)；
A --- test specimen bearing area (mm2)；
α is the experience conversion coefficient of Φ 100x100mm concrete cylindrical test specimen and standard cube test piece intensity, herein
Take 1.0；
Compression strength of concrete test parts calculating should be accurate to 0.1Mpa；
2) for every group of 3 test specimens in the production of load box grouting behind shaft or drift lining test site, molding, sampling, determining as follows should
The concrete crushing strength typical value of group test specimen:
(1) using the arithmetic mean of instantaneous value of three test specimen measured values as the compression strength value of this group of test specimen；
Maximum or minimum value in (2) three measured values, the difference if any one and median are more than the 15% of median, then
Maximum and minimum value gives up remove together, takes median as the compression strength value of this group of test specimen；
Maximum or minimum value in (3) three measured values as there are two 15% that the difference of measured value and median is more than median,
Then the test data of this group of test specimen is invalid.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of detection device about the evaluation of load box grouting behind shaft or drift lining compression strength, it is characterised in that: the detection device includes lotus
Carry case grouting behind shaft or drift lining equipment (1), grouting pipeline (2), overfall pipeline (3) and slip casting load box (4)；
The slurries delivery outlet of load box grouting behind shaft or drift lining equipment (1) is connect by grouting pipeline (2) with slip casting load box (4)；
Overfall pipeline (3) is connect with slip casting load box (4).
2. the detection device according to claim 1 about the evaluation of load box grouting behind shaft or drift lining compression strength, it is characterised in that: note
The latus rectum for starching pipeline (2) is DN25, and the latus rectum of overfall pipeline (3) is DN6 or DN8；Grouting pipeline (2) and overfall pipeline (3) are adopted
It is threadedly coupled and fastens and sealed equipped with sealing element.
3. the detection device according to claim 1 about the evaluation of load box grouting behind shaft or drift lining compression strength, it is characterised in that: note
Slurry pipeline (2) and overfall pipeline (3) are made of high pressure wire braided hose, and grouting pipeline (2) and overfall pipeline (3) is soft
Pipe fitting uses attaching type.
4. the detection device according to claim 1 about the evaluation of load box grouting behind shaft or drift lining compression strength, it is characterised in that: high
Steel wire braided construction hose is two layers or compound steel silk winding arrangement.
5. a kind of detection side of the detection device about the evaluation of load box grouting behind shaft or drift lining compression strength as described in claim 1-4
Method, it is characterised in that the detection method includes the following steps:
Intensity test is carried out to target cylinder test specimen with electric-liquid type pressure test machine；
1) it is tested under with constraint conditions
(1) first belt restraining surface of test piece wiped clean is measured size, and checks its appearance；Dimensional measurement is accurate to 1 millimeter,
And the bearing area of belt restraining test specimen is calculated accordingly；
(2) belt restraining test specimen is placed on the lower platen of pressure testing machine, the pressure-bearing surface of test specimen is vertical with top surface when molding；
The center of test specimen should be aligned with testing machine lower platen center；
(3) testing machine is started, when top board and test specimen are close, adjustment ball seat keeps contact balanced；Ying Lianxu when test and equably
Loading, loading speed are as follows:
As strength grade of concrete < C30,0.3-0.5MPa/s is taken；
When strength grade of concrete is between C30 and C60,0.5-0.8MPa/s is taken；
As strength grade of concrete >=C60,0.8-1.0MPa/s is taken；
(4) when loading to belt restraining test specimen settling amount reaches 60~80mm, and load is greater than same type concrete crushing strength and refers to
When mark, stop testing machine throttle, loading terminates, and records payload values at this time；
2) it abolishes and is tested under constraint condition
Cylinder test specimen is made in the test specimen taken out in jack cylinder body before test, test specimen upper and lower end face polishes processing and and outer circle
Verticality≤0.1mm；
(1) first that test specimen surface wipes to be measured are clean, size is checked, and check its appearance；Dimensional measurement is accurate to 1 millimeter, and
The bearing area of calculation testing piece accordingly；
(2) test specimen to be measured is placed on the lower platen of pressure testing machine, the pressure-bearing surface of test specimen is vertical with top surface when molding；Examination
The center of part should be aligned with testing machine lower platen center；
(3) testing machine is started, when top board and test specimen are close, adjustment ball seat keeps contact balanced.Ying Lianxu when test and equably
Loading, loading speed are as follows:
As strength grade of concrete < C30,0.3-0.5MPa/s is taken；
When strength grade of concrete is between C30 and C60,0.5-0.8MPa/s is taken；
As strength grade of concrete >=C60,0.8-1.0MPa/s is taken；
(4) when loading to close destroy of test specimen starts deformation rapidly, stopping Adjustment Tests machine oil door, until test specimen destroys；
The failing load value of record at this time.
6. the detection method of the detection device according to claim 5 about the evaluation of load box grouting behind shaft or drift lining compression strength,
Be characterized in that: step 2) is abolished under constraint condition in test:
The specification of cylinder test specimen is Φ 100x100mm, and its ratio of height to diameter is 1.
7. the detection method of the detection device according to claim 5 about the evaluation of load box grouting behind shaft or drift lining compression strength,
Pressure testing machine is characterized by measure the ultimate load of each group target test specimen under with constraint conditions respectively and abolish constraint item
The failing load numerical value of each group target test specimen under part is evaluated under with constraint conditions and broken respectively using following calculation and analysis methods
Except the compression strength index of target test specimen under constraint condition；
1) target cylinder test specimen compression strength calculation formula: fcu=α F/A
In formula: fcu --- target cylinder test specimen compression strength (Mpa)；
α --- conversion coefficient；
F --- ultimate load/failing load (N)；
A --- test specimen bearing area (mm2)；
α is the experience conversion coefficient of Φ 100x100mm concrete cylindrical test specimen and standard cube test piece intensity, is taken herein
1.0；
Compression strength of concrete test parts calculating should be accurate to 0.1Mpa；
2) every group of 3 test specimens determine that the group is tried in the production of load box grouting behind shaft or drift lining test site, molding, sampling as follows
The concrete crushing strength typical value of part:
(1) using the arithmetic mean of instantaneous value of three test specimen measured values as the compression strength value of this group of test specimen；
Maximum or minimum value in (2) three measured values, the difference if any one and median is more than the 15% of median, then maximum
And minimum value gives up remove together, takes median as the compression strength value of this group of test specimen；
Maximum or minimum value in (3) three measured values was as there are two 15% that the difference of measured value and median is more than median, then should
The test data of group test specimen is invalid.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910129333.7A CN109706986A (en) | 2019-02-21 | 2019-02-21 | A kind of detection device and detection method about the evaluation of load box grouting behind shaft or drift lining compression strength |
| PCT/CN2019/126155 WO2020168800A1 (en) | 2019-02-21 | 2019-12-18 | Detection apparatus and detection method for load box post-grouting compressive strength evaluation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910129333.7A CN109706986A (en) | 2019-02-21 | 2019-02-21 | A kind of detection device and detection method about the evaluation of load box grouting behind shaft or drift lining compression strength |
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| CN109706986A true CN109706986A (en) | 2019-05-03 |
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| WO (1) | WO2020168800A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110044705A (en) * | 2019-05-14 | 2019-07-23 | 北京市建设工程质量第二检测所有限公司 | A kind of concrete anti-compression method for testing performance based on construction |
| WO2020168800A1 (en) * | 2019-02-21 | 2020-08-27 | 南昌永祺科技发展有限公司 | Detection apparatus and detection method for load box post-grouting compressive strength evaluation |
| CN112127395A (en) * | 2020-10-09 | 2020-12-25 | 瞿启芳 | Load box for improving structural strength of pile foundation self-balancing pile body |
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| CN115233648B (en) * | 2022-08-01 | 2024-03-22 | 中国电建集团西北勘测设计研究院有限公司 | Reinforcing method for gravel foundation containing weak interlayer |
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