A detachable mold and instrument fixing device for embedding strain gauges

Abstract

The utility model belongs to the technical field of building engineering, disclose a kind of detachable mould and instrument fixing device of embedded strain gauge.The detachable mould includes: lower baffle and mould assembly, the lower baffle is used for the support of detachable mould of embedded strain gauge, the mould assembly includes left baffle, right baffle, bolt one, nut one, front baffle, rear baffle one, rear baffle two, boss and strain gauge, the left baffle is connected to lower baffle, the right baffle is connected to the lower baffle, the bolt one is movably arranged in the left baffle and right baffle, the nut one is connected to the bolt one, the assembly or stripping of test piece mould can be realized quickly, using modular splicing installation, avoid the damage of traditional mould stripping vibration to strain gauge, strain gauge embedded position can also be flexibly adjusted according to requirement, to ensure that strain gauge is at test piece center position, and then the reliability of strain monitoring data is significantly improved.

Description

Technical Field

[0001] This utility model belongs to the field of building engineering technology, and in particular relates to a detachable mold and instrument fixing device for pre-embedded strain gauges. Background Technology

[0002] Currently, in the field of building engineering technology, strain gauges are usually embedded inside concrete specimens to measure data such as strain and temperature changes in concrete. In actual operation, in order to accurately monitor the changes in concrete strain, according to the requirements of the Hydraulic Concrete Test Code (SL / T 352-2020), the strain gauges need to be precisely placed at the geometric center of the specimen. However, in the traditional pouring process, this method is not convenient to operate. Operators usually need to fix the strain gauges with cable ties or hold the strain gauges by hand while pouring.

[0003] Existing strain gauges have certain defects in pre-embedding. The cable ties are prone to breakage during tamping, and the hand position is not easy to control, which affects the placement of the strain gauges and ultimately affects the accuracy of subsequent data. In addition, the use of an integrated mold for casting means that the vibration of the demolding machine can also damage the strain gauges when demolding them later. Utility Model Content

[0004] This invention addresses certain shortcomings in the pre-embedding of strain gauges in existing technologies. These include the tendency of cable ties to break during insertion and tamping, difficulty in controlling the hand position, which affects the strain gauge placement and ultimately the accuracy of subsequent data. Furthermore, the use of an integrated mold for casting means that vibrations from the demolding machine can damage the strain gauges during subsequent demolding. The following technical solution is proposed: A detachable mold for pre-embedded strain gauges, comprising: The lower baffle is used to support the detachable mold for pre-embedded strain gauges; A mold assembly includes a left baffle, a right baffle, a bolt, a nut, a front baffle, a rear baffle, a second rear baffle, a protrusion, and a strain gauge. The left baffle is connected to the lower baffle, the right baffle is connected to the lower baffle, the bolt is movably disposed on the left and right baffles, the nut is connected to the bolt, the front baffle is inserted into the left and right baffles, the rear baffle is inserted into the left baffle, the second rear baffle is inserted into the right baffle, the protrusion is connected to the second rear baffle, the protrusion is inserted into the first rear baffle, and the strain gauge is movably disposed on the first and second rear baffles.

[0005] Preferably, both the first rear baffle and the second rear baffle are provided with reserved holes, and the two reserved holes are arranged in a one-to-one correspondence, with the strain gauge movably disposed in the reserved hole.

[0006] Preferably, the rear baffle has a slot, and the protrusion is correspondingly disposed in the slot and inserted into the slot.

[0007] An instrument fixing device, utilizing the aforementioned instrument fixing device for a pre-embedded strain gauge with a detachable mold, is characterized in that it includes a fixing component, the fixing component comprising a retractable fixing clamp, a connector, a retractable bracket, two bolts, and two nuts. The retractable fixing clamp is movably disposed on the strain gauge, the connector is connected to the retractable fixing clamp, the retractable bracket is connected to the connector, the two bolts are movably disposed on the connector, and the two nuts are connected to the two bolts.

[0008] Preferably, two connectors are provided on the second bolt, and the two connectors are respectively located at both ends of the second bolt. The connectors are provided in a one-to-one correspondence with the retractable fixing clamp.

[0009] Preferably, two retractable brackets are provided on the connector, and the two retractable brackets are respectively located at both ends of the connector.

[0010] The beneficial effects of this utility model are as follows: It can quickly assemble or demold the specimen mold, and adopts modular splicing installation to avoid damage to the strain gauges caused by vibration during demolding of traditional molds. It can also flexibly adjust the pre-embedded position of the strain gauge according to the needs, thereby ensuring that the strain gauge is in the center of the specimen, and thus significantly improving the reliability of strain monitoring data. Attached Figure Description

[0011] Figure 1 The diagram shown is a structural schematic of a detachable mold and instrument fixing device for a pre-embedded strain gauge; Figure 2 The diagram shown is a schematic of the installation structure of the strain gauge; Figure 3 The diagram shown is a schematic of the installation structure of the retractable fixed wide clamp; Figure 4 The diagram shows the mounting structure of the protrusion; In the diagram: 1. Lower baffle; 2. Left baffle; 3. Right baffle; 4. Bolt 1; 5. Nut 1; 6. Front baffle; 7. Rear baffle 1; 8. Rear baffle 2; 9. Protrusion; 10. Strain gauge; 11. Reserved hole; 12. Slot; 13. Telescopic fixing clamp; 14. Connector; 15. Telescopic bracket; 16. Bolt 2; 17. Nut 2. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0013] Example 1 This utility model provides a detachable mold and instrument fixing device for pre-embedded strain gauges, such as Figures 1 to 4As shown, it includes: a lower baffle 1 and a mold assembly. The lower baffle 1 is used to support the detachable mold for pre-embedded strain gauges. The mold assembly includes a left baffle 2, a right baffle 3, bolt 4, nut 5, a front baffle 6, a rear baffle 7, a rear baffle 8, a protrusion 9, and a strain gauge 10. The left baffle 2 is connected to the lower baffle 1, and the right baffle 3 is connected to the lower baffle 1. The lower baffle 1 is fixedly connected to both the left baffle 2 and the right baffle 3 by bolts. Bolt 4 is movably disposed on the left baffle 2 and the right baffle 3. Nut 5 is connected to bolt 4. Each bolt 4 corresponds to two nuts 5. One nut 5 is held against the outer surface of the left baffle 2, and the other nut 5 is held against the outer surface of the right baffle 3. The front baffle 6 is inserted into the left baffle 2. Baffle 2 and right baffle 3 are provided. Rear baffle 1 7 is inserted into left baffle 2, and rear baffle 2 8 is inserted into right baffle 3. Protrusion 9 is connected to rear baffle 2 8 and is semi-cylindrical in shape. Strain gauge 10 is movably disposed on rear baffle 1 7 and rear baffle 2 8. Both rear baffle 1 7 and rear baffle 2 8 have reserved holes 11. The reserved holes 11 are semi-circular in shape. The two reserved holes 11 are combined to form a circular reserved hole 11. The center of the reserved hole 11 is on the same horizontal line as the center of the strain gauge 10. The two reserved holes 11 are set one-to-one. Strain gauge 10 is movably disposed in the reserved hole 11. Rear baffle 1 7 has a slot 12. The size of the slot 12 is the same as the size of the protrusion 9. The protrusion 9 is inserted into the slot 12 from top to bottom. The protrusion 9 is correspondingly set in the slot 12. The protrusion 9 is inserted into the slot 12. An instrument fixing device, which utilizes the aforementioned instrument fixing device for a pre-embedded strain gauge with a detachable mold, is characterized by including a fixing component. The fixing component includes a telescopic fixing clamp 13, a connector 14, a telescopic bracket 15, a bolt 16, and a nut 17. The telescopic fixing clamp 13 is movably mounted on the strain gauge 10. The telescopic fixing clamp 13 consists of a telescopic rod and a fixing clamp, which can drive the fixing clamp to move horizontally. The connector 14 is connected to the telescopic fixing clamp 13. The connector 14 can be a connecting block. The telescopic bracket 15 is connected to the connecting rod. Connector 14, one connector 14 corresponds to two telescopic brackets 15. The telescopic brackets 15 are L-shaped. The top of the telescopic brackets 15 can extend left and right, and the bottom of the telescopic brackets 15 can extend up and down. Bolt 2 16 is movably set on connector 14. Nut 2 17 is connected to bolt 2 16. The outer surface of nut 2 17 keeps in contact with the outer surface of connector 14. There are two connectors 14 on bolt 2 16. The two connectors 14 are located at both ends of bolt 2 16. Connector 14 is set one-to-one with telescopic fixed wide clamp 13. There are two telescopic brackets 15 on connector 14. The two telescopic brackets 15 are located at both ends of connector 14.

[0014] The mold components enable rapid assembly or demolding of the specimen mold. The modular splicing installation avoids damage to the strain gauge 10 caused by vibration during demolding of traditional molds. The pre-embedded position of the strain gauge 10 can also be flexibly adjusted according to requirements, thereby ensuring that the strain gauge 10 is located at the center of the specimen, thus significantly improving the reliability of strain monitoring data.

[0015] In use, first assemble the lower baffle 1, left baffle 2, right baffle 3, front baffle 6, rear baffle 1, and rear baffle 2 to form the mold cavity. At this time, do not tighten the nut 5 on bolt 14 to keep the overall structure adjustable. Next, assemble the strain gauge 10 fixing assembly. Adjust the height and length of the telescopic bracket 15 according to the size of the strain gauge 10, and clamp the strain gauge 10 with the telescopic fixing wide clamp 13. Adjust the strain gauge 10 to the preset center position. Then, lower the strain gauge 10 to the preset position so that the strain gauge 10 is aligned with the reserved hole 11. Remember to run the hydraulic cable through the reserved hole 11 on the rear baffle. After the cable is straightened, tighten the nuts 5 at each part of the mold to ensure the overall stability of the mold. Then, start pouring concrete. First, add material to both sides of the strain gauge 10 and vibrate it to make it dense. To prevent the telescopic fixing clamp 13 from being buried in the concrete, open the clamp after compacting both sides of the strain gauge 10 and take it upward to remove the entire fixing device. Then continue to complete the overall vibration and molding. After the concrete specimen is formed, loosen and remove the bolts 4 and nuts 5. Then, remove the front baffle 6, rear baffle 7, rear baffle 8, left baffle 2, right baffle 3 and lower baffle 1 in sequence to obtain the concrete specimen with the strain gauge 10 embedded.

[0016] Specifically, a left baffle 2 is fixedly connected to the top of the lower baffle 1, and a right baffle 3 is fixedly connected to the top of the lower baffle 1 at the side position of the left baffle 2. Two bolts 4 are movably connected to both ends of the left baffle 2 and the right baffle 3. Nuts 5 are threaded onto the outer surfaces of the left baffle 2 and the right baffle 3 at both ends of the bolts 4. A front baffle 6 is inserted into one end of the left baffle 2 and the right baffle 3. A rear baffle 7 is inserted into the other end of the left baffle 2, and a rear baffle 8 is inserted into the other end of the right baffle 3. A protrusion 9 is fixedly connected to one end of the rear baffle 8, and the interior of the rear baffle 7 corresponds to the exterior of the protrusion 9. A slot 12 is provided at the surface position, and the outer surface of the protrusion 9 is inserted into the slot 12. Both the left baffle 2 and the right baffle 3 have reserved holes 11. A strain gauge 10 is movably connected inside the reserved hole 11. Specifically, two telescopic fixed wide clamps 13 are movably connected to the outer surface of one end of the strain gauge 10. A connector 14 is fixedly connected to the top of the telescopic fixed wide clamp 13. Telescopic brackets 15 are fixedly connected to both ends of the connector 14. Bolts 16 are movably connected inside the two connectors 14. Nuts 17 are threadedly connected to both ends of the bolts 16 on the outer surface of the connectors 14.

[0017] Working Principle: In actual use, the device first assembles the lower baffle 1, left baffle 2, right baffle 3, front baffle 6, rear baffle 7, and rear baffle 8 to form a mold cavity. At this time, the nuts 5 on bolts 4 are not tightened to allow for fine-tuning of the overall structure. Next, the strain gauge 10 fixing assembly is assembled. The height and length of the telescopic bracket 15 are adjusted according to the size of the strain gauge 10, and the strain gauge 10 is clamped by the telescopic fixing clamp 13. The strain gauge 10 is adjusted to be in the preset center position. Then, the strain gauge 10 is lowered to the preset position, aligning it with the pre-drilled hole 11. The hydraulic cable is then passed through the pre-drilled hole 11 in the rear baffle. After straightening the cable, the nuts 5 on each part of the mold are tightened to ensure the overall stability of the mold. Concrete pouring then begins. Material is added to both sides of strain gauge 10 and vibrated to compact it. To prevent the retractable fixing clamp 13 from being embedded in the concrete, the clamp is opened and removed upwards after the two sides of strain gauge 10 are compacted, thereby removing the entire fixing device. Then, the overall vibration molding is completed. After the concrete specimen is formed, bolt 4 and nut 5 are loosened and removed. The front baffle 6, rear baffle 7, rear baffle 8, left baffle 2, right baffle 3 and lower baffle 1 are removed in sequence to obtain the concrete specimen with strain gauge 10 embedded. The specimen mold can be quickly assembled or demolded. The modular splicing installation avoids the damage to strain gauge 10 caused by vibration during demolding of traditional molds. The pre-embedded position of strain gauge 10 can also be flexibly adjusted according to the needs, thereby ensuring that strain gauge 10 is in the center of the specimen, thus significantly improving the reliability of strain monitoring data.

[0018] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A split mold for embedding a strain gauge, characterized by, include: The lower baffle (1) is used to support the detachable mold for pre-embedded strain gauges; The mold assembly includes a left baffle (2), a right baffle (3), a bolt (4), a nut (5), a front baffle (6), a rear baffle (7), a rear baffle (8), a protrusion (9), and a strain gauge (10). The left baffle (2) is connected to the lower baffle (1), the right baffle (3) is connected to the lower baffle (1), the bolt (4) is movably disposed between the left baffle (2) and the right baffle (3), and the nut (5) The bolt (4) is connected to the front baffle (6), which is inserted into the left baffle (2) and the right baffle (3). The rear baffle (7) is inserted into the left baffle (2), the rear baffle (8) is inserted into the right baffle (3), the protrusion (9) is connected to the rear baffle (8), the protrusion (9) is inserted into the rear baffle (7), and the strain gauge (10) is movably disposed on the rear baffle (7) and the rear baffle (8).

2. A split mold for embedding a strain gauge according to claim 1, characterized in that: Both the first rear baffle (7) and the second rear baffle (8) are provided with reserved holes (11), and the two reserved holes (11) are set in a one-to-one correspondence. The strain gauge (10) is movably set in the reserved hole (11).

3. A split mold for embedding a strain gauge according to claim 1, characterized in that: The rear baffle (7) is provided with a slot (12), and the protrusion (9) is correspondingly provided with the slot (12). The protrusion (9) is inserted into the slot (12).

4. An apparatus fixing device using the detachable mold of the pre-embedded strain gauge according to any one of claims 1 to 3, characterized by The device includes a fixing assembly, which includes a retractable fixing clamp (13), a connector (14), a retractable bracket (15), a second bolt (16), and a second nut (17). The retractable fixing clamp (13) is movably disposed on the strain gauge (10), the connector (14) is connected to the retractable fixing clamp (13), the retractable bracket (15) is connected to the connector (14), the second bolt (16) is movably disposed on the connector (14), and the second nut (17) is connected to the second bolt (16).

5. An apparatus securing device according to claim 4, wherein: Two connectors (14) are provided on the second bolt (16). The two connectors (14) are located at both ends of the second bolt (16). The connectors (14) are provided in a one-to-one correspondence with the telescopic fixed wide clamp (13).

6. The instrument fixing device according to claim 4, characterized in that: Two retractable brackets (15) are provided on the connector (14), and the two retractable brackets (15) are located at both ends of the connector (14).

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