CN216434126U - Restraint shrink testing arrangement - Google Patents
Restraint shrink testing arrangement Download PDFInfo
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- CN216434126U CN216434126U CN202123070607.1U CN202123070607U CN216434126U CN 216434126 U CN216434126 U CN 216434126U CN 202123070607 U CN202123070607 U CN 202123070607U CN 216434126 U CN216434126 U CN 216434126U
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Abstract
The utility model discloses a restraint shrinkage testing device, which comprises a steel die, wherein the upper end of the steel die is provided with two parallel ribs, a strip-shaped groove is arranged between the two ribs, a first fixing mechanism and a second fixing mechanism are arranged on the ribs, a reflection target is detachably arranged on the first fixing mechanism, a sensing probe used for detecting the deformation of ultra-high performance concrete in cooperation with the reflection target is arranged on the second fixing mechanism, and the sensing probe is electrically connected with a controller at the rear end; the testing device can conveniently and accurately test the shrinkage deformation of the ultra-high performance concrete under the influence of the surface layer and the reinforcement thickness of the existing structure, and has important engineering significance for evaluating the shrinkage cracking of the ultra-high performance concrete reinforced existing structure.
Description
Technical Field
The utility model relates to an ultra high performance concrete shrinkage performance test technical field, concretely relates to restraint shrink testing arrangement.
Background
Ultra-high Performance Concrete (UHPC) is a fiber reinforced cement-based composite material composed of cement, mineral admixture, fine aggregate, high-strength fiber and the like, has ultrahigh strength, ultrahigh toughness and ultrahigh durability, has become a hotspot in the field of civil engineering, and is gradually popularized and applied in engineering fields such as high-rise buildings, large-span bridges, existing structural reinforcement and the like.
Because the water-gel ratio of UHPC is lower (usually 0.14-0.20), the UHPC has the characteristics of high cementing material dosage, high active mineral admixture dosage, low coarse aggregate dosage and the like, and can generate larger self-shrinkage in the service process after setting and hardening, and has higher early cracking risk. In addition, in the reinforcing engineering, the UHPC is restrained by the surface layer and the reinforcing thickness of the existing structure, and high stress may be generated inside the UHPC, so that the concrete is further cracked, and the safety and the durability of the structure are adversely affected. Therefore, the constraint shrinkage performance test of the UHPC based on the reinforced surface layer and the reinforced thickness has important engineering significance.
The concrete shrinkage test in the domestic current specification T/CECS10107-2020 Ultra High Performance Concrete (UHPC) technical requirement and GB50082-2019 test method standard for long-term performance and durability of common concrete is an unconstrained free shrinkage performance test, which is often inconsistent with the condition that concrete is constrained in different degrees in practical engineering application. For the shrinkage problem of UHPC in different degree constraint states in actual engineering, the conclusion obtained by adopting the free shrinkage test method in the current specification is lack of authenticity. Therefore, a device for testing the shrinkage of the concrete is urgently needed, and the accuracy and precision of the shrinkage measurement deformation of the concrete under the constraint condition are improved.
SUMMERY OF THE UTILITY MODEL
Not enough to above-mentioned prior art, the utility model provides a restraint shrink testing arrangement that precision is high.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides a restraint shrink testing arrangement, it includes the steel mould, the upper end of steel mould is provided with two parallel beads, be provided with the recess that is the bar between two beads, be provided with first fixed establishment and second fixed establishment on the bead, detachable is provided with the reflection target on the first fixed establishment, be provided with on the second fixed establishment be used for with reflect the sensing probe that the target cooperation was surveyed ultra-high performance concrete and warp, sensing probe and the controller electric connection of rear end.
Furthermore, two parallel fixing ear plates protruding downwards are arranged on the first fixing mechanism and the second fixing mechanism, the fixing ear plates are clamped on the outer side faces of the two convex edges, a square hole used for limiting and fixing the reflection target is formed in the first fixing mechanism, and the square hole vertically penetrates through the first fixing mechanism.
Furthermore, a plurality of bolt holes are formed in the side walls of the fixing lug plates and the square holes, and fixing bolts are arranged in the bolt holes.
Further, the fixing bolt is fixedly provided with a cylindrical rotating head, and the side wall of the rotating head is a concave-convex surface.
Furthermore, the reflecting target is of a plate-shaped structure, the reflecting target penetrates through the square hole and extends into the groove, and the front end of the sensing probe vertically points to the reflecting target.
Furthermore, the reflecting targets are respectively arranged at two ends of the groove, and the sensing probe is arranged at the outer side of the reflecting targets.
The utility model has the advantages that:
1. placing the prepared test piece in a groove of a steel die, pouring ultra-high performance concrete (UHPC) on the upper surface of the test piece, fixing two reflecting targets in the appointed position of the groove through a first fixing mechanism, removing the first fixing mechanism after the UHPC reaches initial setting time, fixing the reflecting targets on the UHPC, installing a second fixing mechanism on the outer sides of the reflecting targets, adjusting the sensing probe and the reflecting targets to a proper distance, taking the distance between the two reflecting targets as a reference length, and automatically acquiring the shrinkage deformation value of the concrete through a controller; the testing device of the scheme can conveniently and accurately test the shrinkage deformation of the UHPC under the influence of the surface layer and the reinforcement thickness of the existing structure, and has important engineering significance for evaluating the shrinkage cracking of the UHPC reinforced existing structure.
2. The inner side surfaces of the two fixing lug plates are respectively clamped with the outer side surfaces of the two convex edges, so that the first fixing mechanism and the second fixing mechanism are arranged on the two convex edges in a limiting and fixed mode, meanwhile, the end portions of the fixing mechanisms are abutted to the outer side surfaces of the convex edges through rotating the fixing bolts, the fixing bolts are screwed, the fixing bolts on the two fixing lug plates form a clamping structure with certain pressure, and therefore the first fixing mechanism and the second fixing mechanism are fixedly arranged on the two convex edges.
3. The reflection target is fixedly arranged in the square hole in a penetrating mode, the fixing bolt is screwed, the end portion of the fixing bolt is abutted to the side face of the reflection target, certain pressure is applied to the reflection target by the fixing bolt, friction between the reflection target and the inner wall of the square hole is increased, the reflection target is fixedly arranged in the square hole, meanwhile, when the first fixing mechanism needs to be dismounted, only the fixing bolt on the side wall of the square hole and the fixing lug plate needs to be unscrewed, dismounting can be achieved, and the purpose of convenience in dismounting is achieved.
4. The rotating head with the concave-convex surface is convenient for a user to rotate the fixing bolt.
5. The reflection target penetrates through the square hole and extends into the groove, and the reflection target is fixed on the UHPC when the initial setting time of the UHPC is reached; the front end of the sensing probe is vertically directed to the reflection target, so that the sensing probe can conveniently detect the deformation of the reflection target.
6. And the two ends of the groove are provided with the reflecting targets, so that the reflecting targets can accurately reflect the shrinkage deformation value of the concrete.
Drawings
Fig. 1 is a side sectional view of the present solution.
FIG. 2 is a cross-sectional view of a first securing mechanism and a steel mold.
Fig. 3 is a cross-sectional view of a second securing mechanism and a steel mold.
Figure 4 is a side cross-sectional view of an embodiment.
The device comprises a steel die 1, a rib 2, a groove 3, a groove 4, a first fixing mechanism 5, a second fixing mechanism 6, a reflection target 7, a sensing probe 8, a fixing ear plate 9, a square hole 10, a fixing bolt 11 and a rotating head.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art within the spirit and scope of the present invention as defined and defined by the appended claims.
As shown in fig. 1, the constraint shrinkage testing device of the scheme comprises a steel mold 1 in a strip-shaped structure, two parallel ribs 2 are arranged at the upper end of the steel mold 1, a groove 3 in the shape of a strip is formed between the two ribs 2, a first fixing mechanism 4 and a second fixing mechanism 5 are arranged on each rib 2, a reflection target 6 is detachably arranged on each first fixing mechanism 4, a sensing probe 7 used for being matched with the reflection target 6 to detect the deformation of the ultra-high-performance concrete is arranged on each second fixing mechanism 5, and the sensing probe 7 is electrically connected with a controller at the rear end.
Specifically, as shown in fig. 2 and fig. 3, two parallel fixing ear plates 8 protruding downwards are arranged on the first fixing mechanism 4 and the second fixing mechanism 5, the inner side surfaces of the two fixing ear plates 8 are respectively clamped with the outer side surfaces of the two convex edges 2, a square hole 9 used for limiting and fixing the reflection target 6 is arranged on the first fixing mechanism 4, the square hole 9 vertically penetrates through the first fixing mechanism 4, a plurality of bolt holes are arranged on the side walls of the fixing ear plates 8 and the square hole 9, and a fixing bolt 10 is arranged in each bolt hole. The end parts of the fixing bolts 10 are abutted against the outer side surfaces of the convex edges 2 by rotating the fixing bolts 10, and the fixing bolts 10 on the two fixing lug plates 8 are screwed to form a clamping structure with certain pressure, so that the first fixing mechanism 4 and the second fixing mechanism 5 are fixedly arranged on the two convex edges 2; the reflection target 6 is fixedly arranged in the square hole 9 in a penetrating mode, the fixing bolt 10 is screwed, the end portion of the fixing bolt 10 is abutted to the side face of the reflection target 6, certain pressure is applied to the reflection target 6 through the fixing bolt 10, the friction force between the reflection target 6 and the inner wall of the square hole 9 is increased, the reflection target 6 is fixedly arranged in the square hole 9, meanwhile, when the first fixing mechanism 4 needs to be dismounted, only the fixing bolt 10 on the side wall of the square hole 9 and the fixing lug plate 8 needs to be unscrewed, dismounting can be achieved, and the purpose of convenience in dismounting is achieved.
The front end of fixing bolt 10 is fixed to be provided with and is columniform rotating head 11, and the lateral wall of rotating head 11 is the corrugated surface, and the user of being convenient for rotates fixing bolt 10.
The reflecting target 6 is of a plate-shaped structure and extends into the groove 3 through the square hole 9, and the reflecting target 6 is fixed on the UHPC when the initial setting time of the UHPC is reached; the front end of the sensing probe 7 is vertically directed to the reflecting target 6, so that the sensing probe 7 can detect the deformation of the reflecting target 6 conveniently.
The reflection targets 6 are respectively arranged at two ends of the groove 3, and the sensing probe 7 is arranged at the outer side of the reflection targets 6, so that the reflection targets 6 can accurately reflect the shrinkage deformation value of the concrete.
In summary, as shown in fig. 1 and 4, in the implementation of the present solution, firstly, a fabricated test piece is placed in a groove 3 of a steel mold 1, an Ultra High Performance Concrete (UHPC) is poured on an upper surface of the test piece, a preservative film is covered on the surface of the UHPC, two reflective targets 6 are fixed in designated positions of the groove 3 through a first fixing mechanism 4, a testing device is placed in an environment with a temperature of (20 ± 2) ° c and a relative humidity of (60 ± 5)%, and is maintained, after the UHPC reaches an initial setting time, the first fixing mechanism 4 is removed, so that the reflective targets 6 are fixed on the pc, a second fixing mechanism 5 is installed on an outer side of the reflective targets 6, a sensing probe 7 and the reflective targets 6 are adjusted to a proper distance, the distance between the two reflective targets 6 is used as a reference length, and a controller automatically acquires a shrinkage deformation value of the concrete; the testing device of the scheme can conveniently and accurately test the shrinkage deformation of the UHPC under the influence of the surface layer and the reinforcement thickness of the existing structure, and has important engineering significance for evaluating the shrinkage cracking of the UHPC reinforced existing structure.
Claims (6)
1. The utility model provides a restraint shrink testing arrangement, its characterized in that, includes steel mould (1), the upper end of steel mould (1) is provided with bead (2) of two parallels, two be provided with between bead (2) recess (3) that are the bar, be provided with first fixed establishment (4) and second fixed establishment (5) on bead (2), detachable is provided with reflection target (6) on first fixed establishment (4), be provided with on second fixed establishment (5) and be used for surveying super high performance concrete deformation's sensing probe (7) with reflection target (6) cooperation, sensing probe (7) and the controller electric connection of rear end.
2. The restraint shrinkage testing device according to claim 1, wherein the first fixing mechanism (4) and the second fixing mechanism (5) are provided with two parallel fixing ear plates (8) protruding downwards, the fixing ear plates (8) are clamped on the outer side surfaces of the two convex ribs (2), the first fixing mechanism (4) is provided with a square hole (9) for limiting and fixing the reflection target (6), and the square hole (9) vertically penetrates through the first fixing mechanism (4).
3. The test device for constrained shrinkage according to claim 2, wherein the side walls of the fixing lug plate (8) and the square hole (9) are provided with a plurality of bolt holes, and fixing bolts (10) are arranged in the bolt holes.
4. The test device of claim 3, wherein the fixing bolt (10) is fixedly provided with a cylindrical rotating head (11), and the side wall of the rotating head (11) is concave-convex.
5. The constrained shrinkage test device according to claim 1, wherein the reflective target (6) is a plate-like structure, the reflective target (6) penetrates through the square hole (9) and extends into the groove (3), and the front end of the sensing probe (7) is directed perpendicularly to the reflective target (6).
6. The constrained shrinkage test apparatus according to claim 5, wherein the reflective targets (6) are respectively disposed at both ends of the groove (3), and the sensing probe (7) is disposed outside the reflective targets (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123070607.1U CN216434126U (en) | 2021-12-08 | 2021-12-08 | Restraint shrink testing arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123070607.1U CN216434126U (en) | 2021-12-08 | 2021-12-08 | Restraint shrink testing arrangement |
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| CN216434126U true CN216434126U (en) | 2022-05-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116148452A (en) * | 2023-04-20 | 2023-05-23 | 山东高速明董公路有限公司 | Cement stabilized macadam volume shrinkage measuring device |
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2021
- 2021-12-08 CN CN202123070607.1U patent/CN216434126U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116148452A (en) * | 2023-04-20 | 2023-05-23 | 山东高速明董公路有限公司 | Cement stabilized macadam volume shrinkage measuring device |
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