CN110631522A - String type strain gauge for concrete injection - Google Patents
String type strain gauge for concrete injection Download PDFInfo
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- CN110631522A CN110631522A CN201911064004.5A CN201911064004A CN110631522A CN 110631522 A CN110631522 A CN 110631522A CN 201911064004 A CN201911064004 A CN 201911064004A CN 110631522 A CN110631522 A CN 110631522A
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- strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/04—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string
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Abstract
The invention discloses a string type strain gauge for concrete injection, belongs to the technical field of tunnel construction, and solves the problem that the conventional device cannot realize position adjustment and further cannot realize self-protection; the technical characteristics are as follows: the strain gauge protection device comprises a protection shell and an upper cover plate, wherein vertical through grooves are formed in two sides of the protection shell, the upper cover plate is arranged above the protection shell, a slot is formed in the top of the protection shell, the lower end of the upper cover plate is connected with the slot through a buckle, two strain gauge mounting boxes are symmetrically arranged inside the protection shell, strain gauge assemblies are arranged in the strain gauge mounting boxes, and a protection mechanism for protecting the strain gauge mounting boxes is arranged in the middle of the inside of the protection shell; the position adjusting assembly and the driving assembly are arranged in the embodiment of the invention, so that the position of the strain gauge installation box can be flexibly adjusted, the normal work of the strain gauge assembly is ensured, and meanwhile, the strain gauge assembly is prevented from being interfered by the external environment.
Description
Technical Field
The invention relates to the technical field of tunnel construction, in particular to a string type strain gauge for concrete injection.
Background
At present, a vibrating wire strain gauge mainly comprises three parts: the high-pressure-resistant vibrating wire strain gauge is mainly an instrument which is necessary for automatic safety monitoring of monitoring points with large corresponding variables in tunnel engineering and can be used in other occasions where large strain needs to be measured.
Chinese patent CN205002724U discloses a string strain gauge, which comprises a casing with a through hole, and a left fixing seat and a right fixing seat connected to two ends of the casing, wherein the joints of the left fixing seat, the right fixing seat and the casing are covered with elastic sealing elements respectively. According to the string type strain gauge provided by the invention, the joints of the sleeve and the left fixed seat and the right fixed seat are respectively provided with the sealing parts; however, the device cannot realize position adjustment, so that the device cannot realize self-protection, and normal use of the device is influenced.
Disclosure of Invention
The invention aims to provide a string type strain gauge for concrete injection, which comprises a protective shell and an upper cover plate, wherein vertical through grooves are formed in two sides of the protective shell, the upper cover plate is arranged above the protective shell, a slot is formed in the top of the protective shell, the lower end of the upper cover plate is connected with the slot through a buckle, two strain gauge mounting boxes are symmetrically arranged inside the protective shell, strain gauge assemblies are arranged in the strain gauge mounting boxes, and a protective mechanism for protecting the strain gauge mounting boxes is arranged in the middle of the inside of the protective shell, so that the problem that the conventional device cannot realize position adjustment and further cannot realize self protection is solved.
In order to achieve the purpose, the invention provides the following technical scheme:
the string type strain gauge for concrete spraying comprises a protective shell and an upper cover plate, wherein vertical through grooves are formed in two sides of the protective shell, the upper cover plate is arranged above the protective shell, a slot is formed in the top of the protective shell, the lower end of the upper cover plate is connected with the slot through a buckle, two strain gauge mounting boxes are symmetrically arranged inside the protective shell, strain gauge assemblies are arranged in the strain gauge mounting boxes, and a protective mechanism used for protecting the strain gauge mounting boxes is arranged in the middle of the inside of the protective shell.
As a further scheme of the invention: the protection mechanism comprises two position adjusting assemblies and two driving assemblies, the two driving assemblies are symmetrically arranged relative to the position adjusting assemblies, and the two driving assemblies are fixedly connected with the position adjusting assemblies respectively.
As a still further scheme of the invention: the position adjusting assembly comprises a driving turntable, a ball sleeve and a ball screw, the ball sleeve is embedded in the protective casing, the ball screw is arranged in the ball sleeve, the lower end of the ball screw penetrates through the ball sleeve, the fixedly connected driving turntable is fixedly connected with, the upper end of the ball screw is sleeved with a bearing seat, and the bearing seat is fixedly connected with a driving assembly through a bolt.
As a still further scheme of the invention: the driving assembly comprises a driving sliding block and a driven sliding block, the driving sliding block is fixedly connected with the bearing seat, the driven sliding block is arranged on one side, away from the bearing seat, of the driving sliding block, the driving sliding block is connected with the driven sliding block in a sliding mode, an inclined sliding surface is arranged at the joint of the driving sliding block and the driven sliding block, and one side, away from the driving sliding block, of the driven sliding block is fixedly connected with the strain gauge installation box.
As a still further scheme of the invention: the inner walls of two sides of the protection shell are respectively provided with a bearing bracket used for limiting the strain gauge installation box, the bearing bracket is fixedly connected with the protection shell through screws, a limiting rod is fixedly arranged on a bottom plate of the bearing bracket, a limiting block is arranged at the top of the limiting rod, a horizontal sliding groove is formed in the side wall of the strain gauge installation box, the limiting block is slidably arranged in the horizontal sliding groove, a reset spring is further arranged in the horizontal sliding groove, and the reset spring is fixedly connected with the limiting block.
As a still further scheme of the invention: strainometer install bin inner chamber middle part fixed mounting has the baffle, the strainometer subassembly is installed respectively to the upper and lower both sides of baffle, the strainometer subassembly includes first fixing base, the string, circuit unit and second fixing base, first fixing base and second fixing base all with the lateral wall sliding connection of strainometer install bin, install the string connector on first fixing base and the second fixing base, connect through the string between two string connectors, circuit unit fixed mounting is on the inner wall of strainometer install bin, one side of first fixing base is equipped with the thread groove, install second adjusting nut in the thread groove, pass through threaded connection between second adjusting nut and the thread groove.
As a still further scheme of the invention: one side of second fixing base articulates there are two articulated links, one side that the second fixing base was kept away from to the articulated link articulates respectively has the screw thread piece, the screw thread piece cover is established on the threaded rod, and the symmetry is equipped with two sections on the threaded rod and revolves to opposite, the same external screw thread of pitch, the one end and the baffle rotation of threaded rod are connected, the other end of threaded rod runs through the lateral wall of strainometer install bin, and fixedly connected with second adjusting nut, still be equipped with the tensioning chamber in the strainometer install bin, slide and buffer spring are installed to the tensioning intracavity, slide and buffer spring fixed connection, the slide still with first fixing base fixed.
In conclusion, the beneficial effects of the invention are as follows: the position adjusting assembly and the driving assembly are arranged in the embodiment of the invention, so that the position of the strain gauge mounting box can be flexibly adjusted, the normal work of the strain gauge assembly is ensured, meanwhile, the interference of the external environment on the strain gauge assembly is avoided, and the service life of the strain gauge assembly is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of the invention.
Fig. 2 is a schematic structural view of the upper cover plate in the invention.
Fig. 3 is a schematic structural diagram of a strain gauge mounting box in the invention.
Fig. 4 is a side view of the strain gauge mounting case of the present invention.
Fig. 5 is a cross-sectional view of a strain gauge mounting case of the present invention.
Fig. 6 is a schematic structural diagram of a tension chamber in the invention.
In the figure: 1-a protective shell, 2-an upper cover plate, 3-a slot, 4-a driving turntable, 5-a ball sleeve, 6-a ball screw, 7-a driving slider, 8-a driven slider, 9-a support bracket, 10-a strain gauge mounting box, 11-a limiting rod, 12-a horizontal sliding chute, 13-a limiting block, 14-a second adjusting nut, 15-a first fixed seat, 16-a tensioning cavity, 17-a string wire, 18-a circuit unit, 19-a sliding plate, 20-a buffer spring, 21-a second fixed seat, 22-a thread block, 23-a threaded rod, 24-a second adjusting nut, 25-a hinge rod and 26-a partition plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1-2, in the embodiment of the present invention, a string type strain gauge for concrete injection includes a protective casing 1 and an upper cover plate 2, wherein both sides of the protective casing 1 are provided with vertical through grooves, the upper cover plate 2 is arranged above the protective casing 1, the top of the protective casing 1 is provided with a slot 3, the lower end of the upper cover plate 2 is connected with the slot 3 through a buckle, two strain gauge installation boxes 10 are symmetrically arranged inside the protective casing 1, a strain gauge assembly is arranged in each strain gauge installation box 10, and a protection mechanism for protecting each strain gauge installation box 10 is arranged at the middle position inside the protective casing 1;
the protection mechanism comprises two position adjusting assemblies and two driving assemblies, the two driving assemblies are symmetrically arranged relative to the position adjusting assemblies, and the two driving assemblies are respectively and fixedly connected with the position adjusting assemblies;
the position adjusting assembly comprises a driving turntable 4, a ball sleeve 5 and a ball screw 6, the ball sleeve 5 is embedded in the protective shell 1, the ball screw 6 is arranged in the ball sleeve 5, the lower end of the ball screw 6 penetrates through the ball sleeve 5 and is fixedly connected with the driving turntable 4, a bearing seat is sleeved at the upper end of the ball screw 6, and the bearing seat is fixedly connected with the driving assembly through a bolt;
the driving assembly comprises a driving sliding block 7 and a driven sliding block 8, the driving sliding block 7 is fixedly connected with the bearing seat, the driven sliding block 8 is arranged on one side, away from the bearing seat, of the driving sliding block 7, the driving sliding block 7 is in sliding connection with the driven sliding block 8, inclined sliding surfaces are arranged at the connection position of the driving sliding block 7 and the driven sliding block 8, and one side, away from the driving sliding block 7, of the driven sliding block 8 is fixedly connected with the strain gauge installation box 10;
when the strain gauge mounting box 10 needs to be retracted and extended, the driving rotary table 4 is rotated, the driving rotary table 4 moves along the axial direction of the ball sleeve 5, the ball screw 6 drives the driving slide block 7 to move up and down, the driving slide block 7 drives the driven slide block 8 to move, and synchronous adjustment of the driven slide block 8 is achieved;
as shown in fig. 3-4, the inner walls of two sides of the protection casing 1 are all provided with a supporting bracket 9 for limiting the strain gauge installation box 10, the supporting bracket 9 is fixedly connected with the protection casing 1 through a screw, a limiting rod 11 is fixedly arranged on the bottom plate of the supporting bracket 9, a limiting block 13 is arranged at the top of the limiting rod 11, a horizontal sliding groove 12 is formed in the side wall of the strain gauge installation box 10, the limiting block 13 is slidably arranged in the horizontal sliding groove 12, a reset spring is further arranged in the horizontal sliding groove 12, the reset spring is fixedly connected with the limiting block 13, the limiting block 13 is arranged to limit the strain gauge installation box 10, the strain gauge installation box 10 is prevented from shaking, and the measurement accuracy of the strain gauge assembly is further improved.
Example 2
As shown in fig. 1-2, in the embodiment of the present invention, a string type strain gauge for concrete injection includes a protective casing 1 and an upper cover plate 2, wherein both sides of the protective casing 1 are provided with vertical through grooves, the upper cover plate 2 is arranged above the protective casing 1, the top of the protective casing 1 is provided with a slot 3, the lower end of the upper cover plate 2 is connected with the slot 3 through a buckle, two strain gauge installation boxes 10 are symmetrically arranged inside the protective casing 1, a strain gauge assembly is arranged in each strain gauge installation box 10, and a protection mechanism for protecting each strain gauge installation box 10 is arranged at the middle position inside the protective casing 1;
the protection mechanism comprises two position adjusting assemblies and two driving assemblies, the two driving assemblies are symmetrically arranged relative to the position adjusting assemblies, and the two driving assemblies are respectively and fixedly connected with the position adjusting assemblies;
the position adjusting assembly comprises a driving turntable 4, a ball sleeve 5 and a ball screw 6, the ball sleeve 5 is embedded in the protective shell 1, the ball screw 6 is arranged in the ball sleeve 5, the lower end of the ball screw 6 penetrates through the ball sleeve 5 and is fixedly connected with the driving turntable 4, a bearing seat is sleeved at the upper end of the ball screw 6, and the bearing seat is fixedly connected with the driving assembly through a bolt;
the driving assembly comprises a driving sliding block 7 and a driven sliding block 8, the driving sliding block 7 is fixedly connected with the bearing seat, the driven sliding block 8 is arranged on one side, away from the bearing seat, of the driving sliding block 7, the driving sliding block 7 is in sliding connection with the driven sliding block 8, inclined sliding surfaces are arranged at the connection position of the driving sliding block 7 and the driven sliding block 8, and one side, away from the driving sliding block 7, of the driven sliding block 8 is fixedly connected with the strain gauge installation box 10;
when the strain gauge mounting box 10 needs to be retracted and extended, the driving rotary table 4 is rotated, the driving rotary table 4 moves along the axial direction of the ball sleeve 5, the ball screw 6 drives the driving slide block 7 to move up and down, the driving slide block 7 drives the driven slide block 8 to move, and synchronous adjustment of the driven slide block 8 is achieved;
as shown in fig. 3-4, the inner walls of both sides of the protection housing 1 are respectively provided with a support bracket 9 for limiting the strain gauge mounting box 10, the support bracket 9 is fixedly connected with the protection housing 1 through a screw, a limit rod 11 is fixedly arranged on a bottom plate of the support bracket 9, a limit block 13 is arranged on the top of the limit rod 11, the side wall of the strain gauge mounting box 10 is provided with a horizontal chute 12, the limit block 13 is slidably arranged in the horizontal chute 12, a reset spring is further arranged in the horizontal chute 12 and fixedly connected with the limit block 13, the limit of the strain gauge mounting box 10 is realized through the arrangement of the limit block 13, the strain gauge mounting box 10 is prevented from shaking, and the measurement accuracy of the strain gauge assembly is further improved;
as shown in fig. 5, a partition plate 26 is fixedly installed in the middle of an inner cavity of the strain gauge installation box 10, strain gauge components are installed on the upper side and the lower side of the partition plate 26 respectively, each strain gauge component comprises a first fixed seat 15, a string 17, a circuit unit 18 and a second fixed seat 21, the first fixed seat 15 and the second fixed seat 21 are both connected with the side wall of the strain gauge installation box 10 in a sliding manner, string connectors are installed on the first fixed seat 15 and the second fixed seat 21, the two string connectors are connected through a string, and the circuit unit 18 is fixedly installed on the inner wall of the strain gauge installation box 10;
a thread groove is formed in one side of the first fixing seat 15, a second adjusting nut 14 is installed in the thread groove, the second adjusting nut 14 is in threaded connection with the thread groove, the second adjusting nut 14 is convenient to adjust the position of the first fixing seat 15, two hinge rods 25 are hinged to one side of the second fixing seat 21, thread blocks 22 are hinged to one sides, away from the second fixing seat 21, of the hinge rods 25 respectively, the thread blocks 22 are sleeved on the threaded rods 23, two sections of external threads with opposite rotating directions and the same thread pitch are symmetrically arranged on the threaded rods 23, one end of each threaded rod 23 is rotatably connected with the partition plate 26, and the other end of each threaded rod 23 penetrates through the side wall of the strain gauge mounting box 10 and is fixedly connected with a second adjusting nut 24;
when the strain gauge component is used, the second adjusting nut 24 is rotated, the second adjusting nut 24 drives the threaded rod 23 to rotate, so that the threaded rod 23 drives the threaded block 22 to move in the same direction or in different directions, tensioning or loosening of the string 17 is further realized, the strain gauge component can adapt to different environments for use, and the service life of the strain gauge component is prolonged;
as shown in fig. 6, a tensioning cavity 16 is further formed in strain gauge mounting box 10, a sliding plate 19 and a buffer spring 20 are mounted in tensioning cavity 16, sliding plate 19 and buffer spring 20 are fixedly connected, sliding plate 19 is also fixedly connected with first fixing seat 15, and tensioning cavity 16 is arranged to realize buffer protection of first fixing seat 15 and provide tensioning force for string 17.
In summary, the working principle of the invention is as follows: when the strain gauge mounting box 10 needs to be retracted and extended, the driving rotary table 4 is rotated, the driving rotary table 4 moves along the axial direction of the ball sleeve 5, the ball screw 6 drives the driving slide block 7 to move up and down, the driving slide block 7 drives the driven slide block 8 to move, and synchronous adjustment of the driven slide block 8 is achieved;
during the use, rotate second adjusting nut 24, second adjusting nut 24 drives threaded rod 23 and rotates for threaded rod 23 drives screw block 22 syntropy or heterodromous removal, and then has realized the tensioning or lax to string 17, makes the strainometer subassembly use under can the different environment of adaptation, has prolonged the service life of strainometer subassembly.
The position adjusting assembly and the driving assembly are arranged in the embodiment of the invention, so that the position of the strain gauge installation box 10 can be flexibly adjusted, the normal work of the strain gauge assembly is ensured, meanwhile, the interference of the external environment on the strain gauge assembly is avoided, and the service life of the strain gauge assembly is prolonged.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are only for the convenience of description of the invention and to simplify the description, and do not indicate or imply that the referred device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. The utility model provides a concrete sprays uses string formula strainometer, including protection casing (1) and upper cover plate (2), vertical logical groove has all been seted up to the both sides of protection casing (1), the top of protection casing (1) is equipped with upper cover plate (2), slot (3) have been seted up at the top of protection casing (1), a serial communication port, the lower extreme and slot (3) of upper cover plate (2) are connected through the buckle, the inside symmetry of protection casing (1) is equipped with two strainometer install bins (10), be equipped with the strainometer subassembly in strainometer install bin (10), the inside intermediate position of protection casing (1) is equipped with the protection mechanism who is used for protecting strainometer install bin (10).
2. The string strain gauge for concrete injection according to claim 1, wherein the protection mechanism comprises two position adjustment assemblies and two driving assemblies, the two driving assemblies are symmetrically arranged around the position adjustment assemblies, and the two driving assemblies are respectively fixedly connected with the position adjustment assemblies.
3. The string type strain gauge for concrete injection according to claim 2, wherein the position adjusting assembly comprises a driving turntable (4), a ball sleeve (5) and a ball screw (6), the ball sleeve (5) is embedded in the protective casing (1), the ball screw (6) is arranged in the ball sleeve (5), the lower end of the ball screw (6) penetrates through the ball sleeve (5) and is fixedly connected with the driving turntable (4), and a bearing seat is sleeved on the upper end of the ball screw (6) and is fixedly connected with the driving assembly through a bolt.
4. The string type strain gauge for concrete injection according to claim 3, wherein the driving assembly comprises a driving slider (7) and a driven slider (8), the driving slider (7) is fixedly connected with the bearing seat, the driven slider (8) is arranged on one side, away from the bearing seat, of the driving slider (7), the driving slider (7) is slidably connected with the driven slider (8), inclined sliding surfaces are arranged at the joint of the driving slider (7) and the driven slider (8), and one side, away from the driving slider (7), of the driven slider (8) is fixedly connected with the strain gauge mounting box (10).
5. The string type strain gauge for concrete spraying according to claim 4, wherein the inner walls of two sides of the protective shell (1) are respectively provided with a support bracket (9) for limiting the strain gauge mounting box (10), the support brackets (9) are fixedly connected with the protective shell (1) through screws, a limiting rod (11) is fixedly arranged on a bottom plate of each support bracket (9), a limiting block (13) is arranged at the top of each limiting rod (11), a horizontal sliding groove (12) is formed in the side wall of the strain gauge mounting box (10), each limiting block (13) is slidably arranged in the corresponding horizontal sliding groove (12), a reset spring is further arranged in each horizontal sliding groove (12), and each reset spring is fixedly connected with each limiting block (13).
6. The string type strain gauge for concrete spraying according to any one of claims 1-5, wherein a partition plate (26) is fixedly installed in the middle of an inner cavity of the strain gauge mounting box (10), strain gauge components are installed on the upper side and the lower side of the partition plate (26) respectively, each strain gauge component comprises a first fixing seat (15), a string wire (17), a circuit unit (18) and a second fixing seat (21), the first fixing seat (15) and the second fixing seat (21) are connected with the side wall of the strain gauge mounting box (10) in a sliding mode, string wire connectors are installed on the first fixing seat (15) and the second fixing seat (21), the two string wire connectors are connected through the string wires, and the circuit unit (18) is fixedly installed on the inner wall of the strain gauge mounting box (10).
7. The string type strain gauge for concrete injection according to claim 6, wherein a thread groove is formed on one side of the first fixed seat (15), a second adjusting nut (14) is installed in the thread groove, and the second adjusting nut (14) is in threaded connection with the thread groove.
8. The string type strain gauge for concrete injection according to claim 6, wherein one side of the second fixed seat (21) is hinged with two hinged rods (25), one side of each hinged rod (25) far away from the second fixed seat (21) is respectively hinged with a thread block (22), each thread block (22) is sleeved on each threaded rod (23), two sections of external threads with opposite rotating directions and same thread pitch are symmetrically arranged on each threaded rod (23), one end of each threaded rod (23) is rotatably connected with the partition plate (26), and the other end of each threaded rod (23) penetrates through the side wall of the strain gauge mounting box (10) and is fixedly connected with a second adjusting nut (24).
9. The string type strain gauge for concrete spraying according to claim 6, wherein a tensioning cavity (16) is further formed in the strain gauge mounting box (10), a sliding plate (19) and a buffer spring (20) are mounted in the tensioning cavity (16), the sliding plate (19) and the buffer spring (20) are fixedly connected, and the sliding plate (19) is further fixedly connected with the first fixing seat (15).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911064004.5A CN110631522B (en) | 2019-11-04 | 2019-11-04 | String type strain gauge for concrete injection |
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| CN201911064004.5A CN110631522B (en) | 2019-11-04 | 2019-11-04 | String type strain gauge for concrete injection |
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| CN110631522A true CN110631522A (en) | 2019-12-31 |
| CN110631522B CN110631522B (en) | 2021-04-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113916408A (en) * | 2021-08-23 | 2022-01-11 | 中建三局第三建设工程有限责任公司 | Method for measuring internal stress of concrete structure |
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| CN113916408A (en) * | 2021-08-23 | 2022-01-11 | 中建三局第三建设工程有限责任公司 | Method for measuring internal stress of concrete structure |
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| CN110631522B (en) | 2021-04-13 |
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