CN105604103A - Installing device of strain gauge inside miniature steel pipe pile and strain gauge installing method thereof - Google Patents
Installing device of strain gauge inside miniature steel pipe pile and strain gauge installing method thereof Download PDFInfo
- Publication number
- CN105604103A CN105604103A CN201610102390.2A CN201610102390A CN105604103A CN 105604103 A CN105604103 A CN 105604103A CN 201610102390 A CN201610102390 A CN 201610102390A CN 105604103 A CN105604103 A CN 105604103A
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- steel pipe
- pipe pile
- miniature steel
- strain gauge
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses an installing device of a strain gauge inside a miniature steel pipe pile and a strain gauge installing method thereof. The installing device comprises a threaded steel bar and two round fixing apparatuses identical in structure, wherein each round fixing apparatus comprises a preserved steel bar hole and at least one preserved slurry through hole, the threaded steel bars penetrate into the preserved steel bar holes formed in the two round fixing apparatuses and are fixedly connected with the two round fixing apparatuses, and the diameter of each round fixing apparatus is slightly smaller than that of the miniature steel pipe pile. The strain gauge is bound on the threaded steel bars between the two round fixing apparatuses and is downwards put in the miniature steel pipe pile with the threaded steel bars and the two round fixing apparatuses, and a cable of the strain gauge penetrates through the preserved slurry through holes formed in the round fixing apparatuses located at the upper end and extend out of the miniature steel pipe pile. The installing device has the advantages of being capable of ensuring that the strain gauge is installed at the midpoint or the required strain measurement position of the miniature steel pipe pile in a vertical mode, enabling a measurement result to be more accurate and being simple and convenient to install, easy to operate and low in cost.
Description
Technical field
The present invention relates to foundation pile detection field, be specifically related to a kind of erecting device of miniature steel pipe pile internal strain-ga(u)ge unit and the method that strain gauge is installed thereof.
Background technology
Miniature steel pipe pile refers generally to a footpath and is less than 30cm, and the Small Diameter Pile type that slenderness ratio is greater than 30 has that 1. construction equipment is little, is applicable to narrow work zone; 2. Construction Vibration, noise are little, are applicable to the urban district that public hazards are strictly controlled; 3. slenderness ratio is large, and it is few that single pile consumes material; 4. adopt secondary grouting technique, compared with same volume bored concrete pile, bearing capacity is higher. Along with the extensive use of miniature steel pipe pile, the requirement detecting for the pile strain in its test of bearing capacity process is also increased thereupon. And all there is certain deficiency in the detection method of miniature steel pipe pile strain at present: (1) is at the inner strain gauge of directly placing of miniature steel pipe pile, and control the position of strain gauge in miniature steel pipe pile by cable, this method can not ensure strain gauge in vertical mode the center in miniature steel pipe pile or need to measure the position of its strain, and cannot ensure that strain gauge is not damaged in miniature steel pipe pile slip casting process; (2) paste foil gauge at miniature steel pipe pile pile body outer wall, the foil gauge that this method is laid is easy to be damaged in pile driving process.
Summary of the invention
The technical problem to be solved in the present invention is, for existing miniature steel pipe pile strain detecting method above shortcomings, provide a kind of erecting device of miniature steel pipe pile internal strain-ga(u)ge unit and the method that strain gauge is installed thereof, the convenient pile strain of strain gauge being installed and can being detected exactly miniature steel pipe pile of device.
The present invention for solving the problems of the technologies described above adopted technical scheme is:
A kind of erecting device of miniature steel pipe pile internal strain-ga(u)ge unit, comprise a spiral and two circular fixators that structure is identical, circular fixator comprises a reserved steel bar hole and at least one reserved logical slurry hole, reserved logical slurry hole is for slip casting in the stake of the cable by strain gauge and miniature steel pipe pile, spiral is arranged in the reserved steel bar hole of two circular fixators and is affixed with two circular fixators, and the diameter of described circular fixator is slightly less than miniature steel pipe pile stake footpath; Strain gauge colligation is on the spiral between two circular fixators, and transfer to miniature steel pipe pile with spiral and two circular fixators, the cable of strain gauge passes and extends to miniature steel pipe pile from the reserved logical slurry hole of the circular fixator that is positioned at upper end.
Press such scheme, the both sides up and down of described circular fixator arrange hold-down nut, and circular fixator is fixed on spiral by hold-down nut.
Press such scheme, the length that the distance between two circular fixators is strain gauge adds 20 ~ 40cm.
Press such scheme, in the time of miniature steel pipe pile stake footpath >=10cm, described circular fixator adopts five hole circle shape fixators, reserved steel bar hole and four large diameter reserved logical slurry holes of a minor diameter are set on five hole circle shape fixators, reserved steel bar hole is arranged on the center of five hole circle shape fixators, and four reserved logical slurry holes are symmetrical arranged (the diameter sum in two reserved logical slurry holes and a reserved steel bar hole is less than the diameter of five hole circle shape fixators) around reserved steel bar hole.
Press such scheme, in the time of the < 10cm of miniature steel pipe pile stake footpath, described circular fixator adopts the circular fixator of diplopore, reserved steel bar hole and a large diameter reserved logical slurry hole of a minor diameter are set on the circular fixator of diplopore, reserved steel bar hole is arranged on the edge of the circular fixator of diplopore, and the reserved logical hole circular fixator central shaft of whole diplopore relative to reserved steel bar hole of starching is symmetrical arranged (diameter and the diameter that is less than the circular fixator of diplopore in reserved logical slurry hole and reserved steel bar hole).
Press such scheme, the diameter in the reserved steel bar hole on described circular fixator, reserved logical slurry hole is adjusted according to the internal diameter size of miniature steel pipe pile.
The present invention also provides a kind of erecting device of above-mentioned miniature steel pipe pile internal strain-ga(u)ge unit that the method for strain gauge is installed, and comprises the following steps:
1) choose the kind of the circular fixator that will adopt according to the stake footpath of miniature steel pipe pile, when miniature steel pipe pile stake footpath >=10cm, select five hole circle shape fixators, when the < 10cm of miniature steel pipe pile stake footpath, select the circular fixator of diplopore;
2) spiral is passed from the reserved steel bar hole of circular fixator, and be fixed on spiral upper and lower circular fixator by hold-down nut;
3) strain gauge is passed through to nylon cable tie colligation on spiral;
4) need to test the number of strain location according to miniature steel pipe pile, the end of the spiral of the erecting device of the described miniature steel pipe pile internal strain-ga(u)ge unit of corresponding number is welded by connecting reinforcement;
5) each strain gauge is transferred to miniature steel pipe pile with spiral and two circular fixators, the cable of the strain gauge on each erecting device passes from the reserved logical slurry hole of the circular fixator that is positioned at upper end, and extends to outside miniature steel pipe pile;
6) inject and require according to miniature steel pipe pile Design of Bearing Capacity the cement grout configuring, cement grout passes through from the reserved logical slurry hole of circular fixator;
7) treat that complete and miniature steel pipe sunk pile stop time of cement grout maintenance meets design requirement, connect strain acquirement device by the cable of each strain gauge, in process of the test, detect in real time miniature steel pipe pile strain.
Press such scheme, in the time selecting the circular fixator of diplopore in step 1), in step 3), strain gauge colligation is led to a side of starching hole near reserving on spiral.
Press such scheme, in described step 3), strain gauge is by nylon cable tie colligation on spiral, and the upper and lower two ends of strain gauge are 10 ~ 20cm to the distance of circular fixator.
Press such scheme, the length that in described step 4), multiple spirals are spliced is elongated consistent with miniature steel pipe pile.
Beneficial effect of the present invention:
1, by the position that guarantee strain gauge is arranged on the centre of miniature steel pipe pile in vertical mode or needs monitor strain that is fixed of circular fixator and spiral, strain gauge can detect the pile strain of miniature steel pipe pile exactly in real time, make measurement result more accurate, and process in order due to specification colligation and cable, strain gauge is difficult for damaged in miniature steel pipe pile slip casting process;
2, device is installed simple and convenient, easy to operate, with low cost.
Brief description of the drawings
Fig. 1 is the integral installation apparatus structure schematic diagram that the embodiment of the present invention 1 adopts five hole ring fixators;
Fig. 2 is the top view of five hole ring fixators in Fig. 1;
Fig. 3 is the integral installation apparatus structure schematic diagram that the embodiment of the present invention 2 adopts diplopore ring fixator;
Fig. 4 is the top view of diplopore ring fixator in Fig. 3;
In figure: 1-five hole ring fixators, 2-hold-down nut, 3-spiral, 4-strain gauge, 5-cable, 6-nylon cable tie, 7-reserved steel bar hole, the reserved logical slurry of 8-hole, 9-diplopore ring fixator.
Detailed description of the invention
Below in conjunction with accompanying drawing and two preferred embodiments, technical solution of the present invention is described in detail.
The application of embodiment 1(five hole circle shape fixators 1), as shown in Fig. 1 ~ Fig. 2, the erecting device of the miniature steel pipe pile internal strain-ga(u)ge unit described in the embodiment of the present invention 1, comprise a spiral 3 and two five hole circle shape fixators 1 that structure is identical, five hole circle shape fixators 1 comprise a reserved steel bar hole 7 and four reserved logical slurry holes 8, reserved steel bar hole 7 is for passing through spiral 3, reserved logical slurry hole 8 is for slip casting in the stake of the cable 5 by strain gauge 4 and miniature steel pipe pile, spiral 3 is arranged in the reserved steel bar hole 7 of two five hole circle shape fixators 1, the both sides up and down of two five hole circle shape fixators 1 arrange hold-down nut 2, five hole circle shape fixators 1 are fixed on spiral 3 by hold-down nut 2, the diameter of five hole circle shape fixators 1 is slightly less than miniature steel pipe pile stake footpath, strain gauge 4 passes through nylon cable tie 6 colligations on the spiral 3 between two five hole circle shape fixators 1, and transfer to miniature steel pipe pile with spiral 3 and two five hole circle shape fixators 1, the cable 5 of strain gauge 4 passes and extends to miniature steel pipe pile from the reserved logical slurry hole 8 of the five hole circle shape fixators 1 that are positioned at upper end.
Five hole circle shape fixators 1 are the steel five hole circle dishes of a retaining thread reinforcing bar 3 and strain gauge 4 positions, reserved steel bar hole 7 and four large diameter reserved logical slurry holes 8 of a minor diameter are set on five hole circle shape fixators 1, reserved steel bar hole 7 is arranged on the center of five hole circle shape fixators 1, four reserved logical slurry holes 8 are symmetrical arranged around reserved steel bar hole 7 that (the diameter sums in two reserved logical slurry holes 8 and a reserved steel bar hole 7 are less than the diameter of five hole circle shape fixators 1, and reserved steel bar hole 7 and four full as far as possible pavings in reserved logical slurry hole 8 are laid on the circular fixator 9 of diplopore), five hole circle shape fixators 1 and the reserved steel bar hole 7 on it, reserved logical slurry hole 8 can be according to the diameter adjustment of miniature steel pipe pile in the time making.
As shown in Fig. 1 ~ Fig. 2, the method that adopts the erecting device of five hole ring fixators 1 to carry out strain gauge installation, comprises the following steps:
1) spiral 3 is passed from the reserved steel bar hole 7 of five hole circle shape fixators 1, and be fixed on spiral 3 upper and lower five hole circle shape fixators 1 by hold-down nut 2, the distance of two five hole circle shape fixators 1 is that the length of strain gauge 4 adds 30cm;
2) by strain gauge 4 by nylon cable tie 6 colligations on spiral 3, strain gauge Shang Xia 4 two ends be 15cm to the distance of five hole circle shape fixators 1;
3) need to test the number of strain location according to miniature steel pipe pile, the end of the spiral 3 of the erecting device of the described miniature steel pipe pile internal strain-ga(u)ge unit of corresponding number is welded by connecting reinforcement, and the connecting reinforcement adopting between two erecting devices adopts plain bar; The length that multiple spirals 3 are spliced is elongated consistent with miniature steel pipe pile;
4) each strain gauge 4 is transferred to miniature steel pipe pile with spiral 3 and two five hole circle shape fixators 1, the cable 5 of the strain gauge 4 on each erecting device passes from the reserved logical slurry hole 8 of the five hole circle shape fixators 1 that are positioned at upper end, and extends to outside miniature steel pipe pile;
5) inject and require according to miniature steel pipe pile Design of Bearing Capacity the cement grout configuring, cement grout passes through from the reserved logical slurry hole 8 of five hole circle shape fixators 1;
6) treat that complete and miniature steel pipe sunk pile stop time of cement grout maintenance meets design requirement, connect strain acquirement device by the cable 5 of each strain gauge 4, in process of the test, detect in real time miniature steel pipe pile strain.
The application of the circular fixator 9 of embodiment 2(diplopore), as shown in Fig. 3 ~ Fig. 4, the erecting device of the miniature steel pipe pile internal strain-ga(u)ge unit described in the embodiment of the present invention 2, comprise a spiral 3 and two diplopore ring fixators 9 that structure is identical, diplopore ring fixator 9 comprises a reserved steel bar hole 7 and a reserved logical slurry hole 8, reserved steel bar hole 7 is for passing through spiral 3, reserved logical slurry hole 8 is for slip casting in the stake of the cable 5 by strain gauge 4 and miniature steel pipe pile, spiral 3 is arranged in the reserved steel bar hole 7 of two diplopore ring fixators 9, the both sides up and down of two diplopore ring fixators 9 arrange hold-down nut 2, diplopore ring fixator 9 is fixed on spiral 3 by hold-down nut 2, the diameter of diplopore ring fixator 9 is slightly less than miniature steel pipe pile stake footpath, strain gauge 4 passes through nylon cable tie 6 colligations on the spiral 3 between two diplopore ring fixators 9, and transfer to miniature steel pipe pile with spiral 3 and two diplopore ring fixators 9, the cable 5 of strain gauge 4 passes and extends to miniature steel pipe pile from the reserved logical slurry hole 8 of the diplopore ring fixator 9 that is positioned at upper end.
The circular fixator 9 of diplopore is steel diplopore disks of a retaining thread reinforcing bar 3 and strain gauge 4 positions, reserved steel bar hole 7 and a large diameter reserved logical slurry hole 8 of a minor diameter are set on the circular fixator 9 of diplopore, reserved steel bar hole 7 is arranged on the edge of the circular fixator 9 of diplopore, reserved logical slurry hole 8 circular fixator 9 central shafts of whole diplopore relative to reserved steel bar hole 7 are symmetrical arranged that (the diameter sum in reserved logical slurry hole 8 and reserved steel bar hole 7 is less than the diameter of diplopore circle fixator 9, and the full as far as possible paving in reserved steel bar hole 7 and reserved logical slurry hole 8 is laid on the circular fixator 9 of diplopore), the circular fixator 9 of diplopore and the reserved steel bar hole 7 on it, reserved logical slurry hole 8 can be according to the diameter adjustment of miniature steel pipe pile in the time making.
As shown in Fig. 3 ~ Fig. 4, the method that adopts the erecting device of diplopore ring fixator 9 to carry out strain gauge installation, comprises the following steps:
1) spiral 3 is passed from the reserved steel bar hole 7 of the circular fixator 9 of diplopore, and fixator 9 is upper and lower is fixed on spiral 3 by circular diplopore by hold-down nut 2, the distance of two circular fixators 9 of diplopore is that the length of strain gauge 4 adds 30cm;
2) by strain gauge 4 by nylon cable tie 6 colligations side (ensureing that it is as far as possible near mini pile Zhuan Nei center) near reserved logical slurry hole on spiral 3, strain gauge 4 Shang Xia two ends be 15cm to the distance of diplopore circle fixator 9;
3) need to test the number of strain location according to miniature steel pipe pile, the end of the spiral 3 of the erecting device of the described miniature steel pipe pile internal strain-ga(u)ge unit of corresponding number is welded by connecting reinforcement, and the connecting reinforcement adopting between two erecting devices adopts plain bar; The length that multiple spirals 3 are spliced is elongated consistent with miniature steel pipe pile;
4) each strain gauge 4 is transferred to miniature steel pipe pile with spiral 3 and two circular fixators 9 of diplopore, the cable 5 of the strain gauge 4 on each erecting device passes from the reserved logical slurry hole 8 of the circular fixator 9 of diplopore that is positioned at upper end, and extends to outside miniature steel pipe pile;
5) inject and require according to miniature steel pipe pile Design of Bearing Capacity the cement grout configuring, cement grout passes through from the reserved logical slurry hole 8 of the circular fixator 9 of diplopore;
6) treat that complete and miniature steel pipe sunk pile stop time of cement grout maintenance meets design requirement, connect strain acquirement device by the cable 5 of each strain gauge 4, in process of the test, detect in real time miniature steel pipe pile strain.
Obviously, above-described embodiment is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention. The apparent variation of being extended out according to spirit of the present invention for those of ordinary skill in the field, or variation are still among protection scope of the present invention.
Claims (10)
1. the erecting device of a miniature steel pipe pile internal strain-ga(u)ge unit, it is characterized in that, comprise a spiral and two circular fixators that structure is identical, circular fixator comprises a reserved steel bar hole and at least one reserved logical slurry hole, reserved logical slurry hole is for slip casting in the stake of the cable by strain gauge and miniature steel pipe pile, spiral is arranged in the reserved steel bar hole of two circular fixators and is affixed with two circular fixators, and the diameter of described circular fixator is slightly less than miniature steel pipe pile stake footpath; Strain gauge colligation is on the spiral between two circular fixators, and transfer to miniature steel pipe pile with spiral and two circular fixators, the cable of strain gauge passes and extends to miniature steel pipe pile from the reserved logical slurry hole of the circular fixator that is positioned at upper end.
2. the erecting device of miniature steel pipe pile internal strain-ga(u)ge unit according to claim 1, is characterized in that, the both sides up and down of described circular fixator arrange hold-down nut, and circular fixator is fixed on spiral by hold-down nut.
3. the erecting device of miniature steel pipe pile internal strain-ga(u)ge unit according to claim 1, is characterized in that, the length that the distance between two circular fixators is strain gauge adds 20 ~ 40cm.
4. the erecting device of miniature steel pipe pile internal strain-ga(u)ge unit according to claim 1, it is characterized in that, in the time of miniature steel pipe pile stake footpath >=10cm, described circular fixator adopts five hole circle shape fixators, reserved steel bar hole and four large diameter reserved logical slurry holes of a minor diameter are set on five hole circle shape fixators, reserved steel bar hole is arranged on the center of five hole circle shape fixators, and four reserved logical slurry holes are symmetrical arranged around reserved steel bar hole.
5. the erecting device of miniature steel pipe pile internal strain-ga(u)ge unit according to claim 1, it is characterized in that, in the time of the < 10cm of miniature steel pipe pile stake footpath, described circular fixator adopts the circular fixator of diplopore, reserved steel bar hole and a large diameter reserved logical slurry hole of a minor diameter are set on the circular fixator of diplopore, reserved steel bar hole is arranged on the edge of the circular fixator of diplopore, and whole diplopore relative to reserved steel bar hole circular fixator central shaft in reserved logical slurry hole is symmetrical arranged.
6. according to the erecting device of the miniature steel pipe pile internal strain-ga(u)ge unit described in claim 4 or 5, it is characterized in that, the diameter in the reserved steel bar hole on described circular fixator, reserved logical slurry hole is adjusted according to the internal diameter size of miniature steel pipe pile.
7. the method for according to the erecting device of one of any described miniature steel pipe pile internal strain-ga(u)ge unit of claim 1 ~ 6, strain gauge being installed, is characterized in that, comprises the following steps:
1) choose the kind of the circular fixator that will adopt according to the stake footpath of miniature steel pipe pile, when miniature steel pipe pile stake footpath >=10cm, select five hole circle shape fixators, when the < 10cm of miniature steel pipe pile stake footpath, select the circular fixator of diplopore;
2) spiral is passed from the reserved steel bar hole of circular fixator, and be fixed on spiral upper and lower circular fixator by hold-down nut;
3) strain gauge is passed through to nylon cable tie colligation on spiral;
4) need to test the number of strain location according to miniature steel pipe pile, the end of the spiral of the erecting device of the described miniature steel pipe pile internal strain-ga(u)ge unit of corresponding number is welded by connecting reinforcement;
5) each strain gauge is transferred to miniature steel pipe pile with spiral and two circular fixators, the cable of the strain gauge on each erecting device passes from the reserved logical slurry hole of the circular fixator that is positioned at upper end, and extends to outside miniature steel pipe pile;
6) inject and require according to miniature steel pipe pile Design of Bearing Capacity the cement grout configuring, cement grout passes through from the reserved logical slurry hole of circular fixator;
7) treat that complete and miniature steel pipe sunk pile stop time of cement grout maintenance meets design requirement, connect strain acquirement device by the cable of each strain gauge, in process of the test, detect in real time miniature steel pipe pile strain.
8. the erecting device of miniature steel pipe pile internal strain-ga(u)ge unit according to claim 7 is installed the method for strain gauge, it is characterized in that, in the time selecting the circular fixator of diplopore in step 1), in step 3), strain gauge colligation is led to a side of starching hole near reserving on spiral.
9. the method for strain gauge is installed according to the erecting device of the miniature steel pipe pile internal strain-ga(u)ge unit described in claim 7 or 8, it is characterized in that, in described step 3), strain gauge is by nylon cable tie colligation on spiral, and the upper and lower two ends of strain gauge are 10 ~ 20cm to the distance of circular fixator.
10. the erecting device of miniature steel pipe pile internal strain-ga(u)ge unit according to claim 7 is installed the method for strain gauge, it is characterized in that, the length that in described step 4), multiple spirals are spliced is elongated consistent with miniature steel pipe pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610102390.2A CN105604103A (en) | 2016-02-24 | 2016-02-24 | Installing device of strain gauge inside miniature steel pipe pile and strain gauge installing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610102390.2A CN105604103A (en) | 2016-02-24 | 2016-02-24 | Installing device of strain gauge inside miniature steel pipe pile and strain gauge installing method thereof |
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| CN105604103A true CN105604103A (en) | 2016-05-25 |
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| CN201610102390.2A Pending CN105604103A (en) | 2016-02-24 | 2016-02-24 | Installing device of strain gauge inside miniature steel pipe pile and strain gauge installing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337447A (en) * | 2016-09-30 | 2017-01-18 | 国网天津市电力公司 | Arrangement method for steel bar strain gauge of pipe pile |
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| CN205369328U (en) * | 2016-02-24 | 2016-07-06 | 中国地质大学（武汉） | Installation device of miniature steel -pipe pile internal strain gauge unit |
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| JP2005256519A (en) * | 2004-03-15 | 2005-09-22 | Takenaka Komuten Co Ltd | Axial force measurement method of ground improvement pile |
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| CN106337447A (en) * | 2016-09-30 | 2017-01-18 | 国网天津市电力公司 | Arrangement method for steel bar strain gauge of pipe pile |
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Application publication date: 20160525 |