CN210742096U - Device for measuring bonding strength of sprayed concrete and surrounding rock - Google Patents
Device for measuring bonding strength of sprayed concrete and surrounding rock Download PDFInfo
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- CN210742096U CN210742096U CN201921495159.XU CN201921495159U CN210742096U CN 210742096 U CN210742096 U CN 210742096U CN 201921495159 U CN201921495159 U CN 201921495159U CN 210742096 U CN210742096 U CN 210742096U
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Abstract
The utility model discloses a device for measuring the bonding strength of sprayed concrete and surrounding rock, which comprises a snap ring, a support frame, a force transmission plate and a chest expander; the clamping ring is connected to a dowel plate through a pull rod, the dowel plate is connected to a chest expander through a dowel rod, and the chest expander is arranged on the supporting frame; the clamping ring is formed by splicing two semicircular arc plates, a stress side plate is fixed around the clamping ring, and the stress side plate is connected with a pull rod; the support frame is in an inverted U shape, a first round hole for penetrating through the dowel bar is formed in the center of the support frame, a side plate is fixed at the bottom end of the support frame, and a second round hole for fixing the support frame on concrete spraying is formed in the side plate. The utility model discloses realize that experimental position random selection, quick accurate ground detect shotcrete and country rock bonding strength data, be favorable to improving detection efficiency.
Description
Technical Field
The utility model relates to a concrete performance test field, especially a shotcrete and country rock bonding strength survey device.
Background
The sprayed concrete is formed by conveying a concrete mixture mixed according to a certain mixing ratio to a nozzle along a pipeline by utilizing compressed air or other power and spraying the mixture on a sprayed surface by depending on continuous impact and compaction of cement and aggregate in the spraying process. The bonding strength of the sprayed concrete and the surrounding rock means that after the sprayed concrete reaches the design age, a puller is used for applying tension to the pull rod, and the tension is slowly applied at the speed of 20N-40N per second until the test piece is broken. And taking the damaged strength of the joint surface of the test piece and the surrounding rock as the bonding strength of the sprayed concrete and the surrounding rock.
The method for measuring the bonding strength of the sprayed concrete and the surrounding rock mainly comprises the steps of applying tension to the pull rod through the puller, enabling the test piece to be damaged along the joint surface of the sprayed concrete and the surrounding rock, and calculating the bonding strength of the sprayed concrete and the surrounding rock according to the tensile stress and the damaged area. How to apply tensile stress to the shotcrete is an important factor influencing the bonding strength of the shotcrete and the surrounding rock, so technical specifications of rock-soil anchor rod and shotcrete support engineering (GB 50086-2015) provide a rule for testing the bonding strength of the shotcrete and the surrounding rock, and the test methods in the specifications comprise two first field methods of completing a drawing test on concrete isolated by a drill core and a second field method of completing a tensile test on a drilled core sample in a test room. The device for measuring the bonding strength of sprayed concrete and surrounding rock on the market at present generally adopts a high-strength material pull rod which is pre-embedded during the construction of the sprayed concrete, a scraper knife is used for repairing a groove with the width of about 50mm along the contour line of a test piece after the construction of the sprayed concrete, only the bottom surface of the test piece is kept to be combined with the surrounding rock, and a diamond drill bit for a small-sized core drilling machine is used for vertically spraying the concrete after the concrete reaches the age and enabling the surface of the surrounding rock to advance to 20mm to form a cylindrical rock core with the sprayed concrete; the supporting device is matched with the anchor rod drawing instrument to slowly apply stress to enable the rock core to be damaged along the surrounding rock joint surface, the intermediate span from the preparation test (embedding the pull rod) to the test (on-site cutting to completing the test) is 28d, and therefore the detection process is long in time consumption.
The core-drilling drawing method is the most widely applied method for measuring the bonding strength of the sprayed concrete and the surrounding rock at present, the method is used for various surrounding rocks, a pulling force is applied to a pull rod through a drawing device, a test piece is damaged along the bonding surface of the sprayed concrete and the surrounding rock, and the bonding strength of the sprayed concrete and the surrounding rock is calculated according to the tensile stress and the damaged area.
With the continuous promotion of reforming and opening business in China, the field of infrastructure in China is bound to be developed newly, sprayed concrete is widely applied to various fields such as traffic engineering, railway engineering, hydraulic engineering, hydroelectric engineering and the like, the bonding strength of the sprayed concrete and surrounding rocks is taken as an important work for ensuring the construction quality of the sprayed concrete, after a high-strength material pull rod is embedded in the center of a test piece during the construction of the sprayed concrete before a drill core drawing method test, a scraper knife is immediately used for trimming into a groove with the width of about 50mm along the contour line of the test piece, only the combination of the bottom surface of the test piece and the surrounding rocks is kept for a test after 28 days of age, the high-strength material pull rod is reserved, so that the verticality of the high-strength material pull rod in the center of a first embedded test piece is difficult to ensure, and the influence on the bonding strength accuracy of the sprayed concrete and the surrounding rocks during the; the test method also has the defects that the test method needs to be manually operated before and after the test with a long period, time and labor are wasted, and the test result is not apparent due to the fact that the test position is determined in advance.
The device for measuring the bonding strength of sprayed concrete and surrounding rock in the current market consists of a supporting device and an anchor rod drawing instrument, wherein before the test, after a high-strength material pull rod is pre-embedded in the center of a test piece during the construction of the sprayed concrete, a scraper knife is immediately used for trimming a groove with the width of about 50mm along the contour line of the test piece, only the bottom surface of the test piece is kept to be combined with the surrounding rock, after the test is carried out after the 28-day age, a diamond drill bit for a small-sized core drilling machine is used for vertically spraying the concrete and the surface of the surrounding rock is advanced to 20mm during the test, so that a; the supporting device and the anchor rod drawing instrument are matched to slowly apply stress, so that the rock core is damaged along the joint surface of the surrounding rock, and the test results in large artificial influence on the detection result and no representativeness.
In general, the current measurement methods have the following disadvantages: 1) the verticality of the high-strength material pull rod in the center of the embedded test piece is difficult to guarantee, and whether the core sample is uniformly stressed or not is directly influenced, so that influence on the accuracy of the bonding strength of the sprayed concrete and the surrounding rock is generated during testing, and adverse influence is generated on engineering. 2) The existing method needs various operations manually before and after the test with a long period, and wastes time and labor. 3) There is a disadvantage that the test position is determined in advance, resulting in that the test result is not distinctive. 4) A large number of reserved high-strength material pull rods need to be pre-buried, so that the test cost is seriously increased, and the material waste is caused. 5) Under the condition that the influence of the considered factors is not considered, the detection result is not representative, so that the detection result does not have reference value, and the safety of constructors in the tunnel is inestimable.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a shotcrete and country rock bonding strength survey device is provided, realize that experimental position random selection, detect shotcrete and country rock bonding strength data fast accurately, be favorable to improving detection efficiency, resources are saved, convenient to use, fast, efficient, the suitability is strong.
In order to solve the technical problem, the utility model discloses a technical scheme is: a device for measuring the bonding strength of sprayed concrete and surrounding rock comprises a clamping ring, a supporting frame, a force transmission plate and a tension device; the clamping ring is connected to a dowel plate through a pull rod, the dowel plate is connected to a chest expander through a dowel rod, and the chest expander is arranged on the supporting frame;
the clamping ring is formed by splicing two semicircular arc plates, a stress side plate is fixed around the clamping ring, and the stress side plate is connected with a pull rod; the support frame is in an inverted U shape, a first round hole for penetrating through the dowel bar is formed in the center of the support frame, a side plate is fixed at the bottom end of the support frame, and a second round hole for fixing the support frame on concrete spraying is formed in the side plate.
Furthermore, the number of the stress side plates on the clamping ring is 3, and each stress side plate is provided with a third round hole; the center of the dowel plate is provided with a fifth round hole for penetrating through the dowel bar, the dowel plate is also provided with 3 fourth round holes, and a pull rod is connected between each fourth round hole and the corresponding third round hole.
Furthermore, the stressed side plates on the clamping ring are spaced by 120 degrees and are uniformly distributed on the clamping ring.
Furthermore, the chest expander adopts a digital display anchor rod drawing instrument with the maximum measuring range of 100KN and the precision of 0.01 KN.
Furthermore, the two semicircular arc plates of the clamping ring are fixed by adopting connecting bolts.
Furthermore, a locking anchorage device is arranged on the dowel bar and used for stabilizing the chest expander.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the measuring device does not need to embed a pull rod in advance, and saves resources and labor compared with the traditional method;
2) the measuring device is installed quickly, so that the detection result can be tested quickly, and the detection efficiency is improved;
3) although the measuring device has a simple structure, the design is reasonable, the installation is simple and convenient, and the potential safety hazard cannot be generated by a tester in the detection process;
4) because the pull rod does not need to be embedded before construction, the work of testers is reduced, the speed is high, the cost of manpower and material resources is saved, and energy conservation and environmental protection are achieved;
5) the materials used by the measuring device can be repeatedly disassembled and assembled, can be repeatedly used, and can be assembled at any time for detection and disassembly and assembly transfer;
6) the manufacturing cost is low, compared with the traditional method, the manufacturing cost of the pre-buried pull rod is low, and the pre-buried pull rod can be repeatedly used;
7) the measuring device has wide application range, can be used for detecting the bonding strength of the sprayed concrete and the surrounding rock on site in any construction site laboratory, can be repeatedly disassembled and assembled, and has high utilization efficiency.
Drawings
FIG. 1 is a schematic view of the overall structure of the device for measuring the bonding strength between shotcrete and surrounding rock.
Fig. 2 is a schematic view of the structure of the middle supporting frame of the present invention.
Fig. 3 is a schematic diagram of the middle snap ring structure of the present invention.
Fig. 4 is a schematic structural view of the middle dowel plate of the present invention.
In the figure: a dowel bar 1; locking the anchorage device 2; a chest expander 3; a support frame 4; an expansion bolt 5; spraying concrete 6; a pull rod 7; a snap ring 8; a force transmission plate 9; a side plate 10; a first circular hole 11; a second circular hole 12; a third circular hole 13; a semicircular arc plate 14; a stressed side panel 15; a connecting bolt 16; a fourth circular hole 17; a fifth circular aperture 18.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model discloses the device comprises following part: support frame 4 (the type of "U" has first round hole 11 of 30mm in the middle of, snap ring 8 (two semicircle boards 14 are constituteed), dowel steel 9, pull rod 7 and chest expander 3 (digital display 100kN manual stock draws appearance, and the reading is accurate to 0.01 kN).
Specifically, the support frame 4 is made of a high-strength alloy plate, two legs of the inverted U-shaped leg are 500mm high, 100mm wide and 20mm thick, a steel plate (namely, a side plate 10) with the length of 50mm, 100mm and 20mm thick is respectively welded at the contact position of the two legs and the concrete surface (the outer side of a test piece) in the horizontal direction, and a second round hole 12 with the length of 10mm and the thickness of 20mm is drilled at the distance of 25mm from the central line of the side plate 10 to the 10 side of each side plate for the expansion bolt 5 to fix the support frame 4; a first round hole 11 with the diameter of 30mm is drilled in the middle of the support frame 4 for a dowel bar 1 of the chest expander 3 to pass through. 4 intensity rigidity of support frame satisfies the detection needs, can guarantee whole testing process in detection device's stability, until detecting the completion, and stability satisfies personnel in the testing process, does not produce the safety risk.
The clamping ring 8 is made of a high-strength alloy plate and specifically consists of two semi-arc plates 14 with the inner diameter of 200mm, the height of 80mm and the plate thickness of 10 mm; the edge of the semicircular arc plate 14 is outwards welded with a high-strength steel plate (namely a stress side plate 15) with the length of 40mm, the width of 80mm and the plate thickness of 10mm, a hole with the diameter of 10mm is drilled at a position 20mm away from the upper edge and the lower edge along the central line with the length direction of 20mm, and the hole is used for connecting a bolt 16 to fix the clamping ring 8; a stress side plate 15 with the length of 40mm and the width of 40mm is horizontally welded on the clamp ring 8 every 120 degrees, and a third round hole 13 with the diameter of 10mm is drilled at the central point of the stress side plate 15 for the pull rod 7 to pass through. The high-strength alloy snap ring 8 is reasonable in design, two semi-arc plates 14 are adopted for connection, material waste caused by the fact that pre-embedded pull rods are commonly adopted in the market is saved, 120-degree three-point loading is adopted to guarantee uniform stress of a core sample, and accuracy of detection data is guaranteed.
The force transmission part is made of a pull rod 7 made of high-strength steel and a high-strength alloy force transmission plate 9, the pull rod 7 is made of high-strength alloy with the diameter of 20mm and the length of 600mm, and the end head of the pull rod 7 is threaded by a numerical control machine tool for 100 mm; the dowel plate 9 is a high-strength alloy plate with the diameter of 300mm and the thickness of 20mm, a fifth round hole 18 with the diameter of 20mm is machined in the circle center of the dowel plate by a numerical control machine, fourth round holes 17 with the diameter of 10mm are drilled at intervals of 120 degrees at a distance of 110mm from the circle center, and high-strength alloy snap rings 8 and pull rods 7 are used; the dowel bar 1 is 10mm in diameter and 300mm in length, the two ends of the dowel bar are respectively provided with 50mm numerically-controlled machine tool thread picks, and each end is provided with 2 matched screws.
The chest expander 3 adopts a digital display anchor rod drawing instrument with mature technology on the market, such as an ML-100KN type digital display anchor rod drawing instrument manufactured by Shanghai Tandao apparatus manufacturer, and the maximum measuring range is 100KN and the precision is 0.01 KN.
The utility model discloses the survey device adopts the wide strip form processing procedure of alloy thick steel plate that excels in, and stable in structure is convenient for observe, can observe the change of whole test procedure injection concrete core with the wall rock bonding face. The utility model discloses survey device and 5 firm in connection of expansion bolts for the country rock, do not take place the displacement in the testing process, survey device and test core appearance height are suitable, make things convenient for the whole experiment of testing personnel operation. The whole size 600 x 300mm after the whole device is finished can accomplish to detect and finish dismantling and boxing, and the next detection is assembled again, accomplishes reuse.
The utility model discloses survey device equipment is accomplished the back, use the diamond bit that the concrete core drill machine used internal diameter 200mm and 400mm respectively with the core by an auxiliary test personnel to support diameter 200, go deep into surrounding rock 20 mm's injection concrete and surrounding rock bonding strength test core appearance, install the survey device by a test personnel under auxiliary test personnel's cooperation, it is experimental to begin, measure core appearance diameter 200mm, manual pressurization is destroyed until injection concrete and surrounding rock bonding surface, the stock is drawn appearance and is shown ultimate tensile force 34.56KN, through calculating a kind injection concrete and surrounding rock bonding strength = ultimate tensile force/injection concrete and surrounding rock bonding surface area, this injection concrete and surrounding rock bonding strength are 1.1MPa, accomplish in whole testing process about 50 min. The measuring device can reduce the detection time, reduce the investment of detection personnel and improve the detection representativeness.
Claims (6)
1. A device for measuring the bonding strength of sprayed concrete and surrounding rock is characterized by comprising a snap ring (8), a support frame (4), a force transmission plate (9) and a chest expander (3); the clamping ring (8) is connected to a dowel plate (9) through a pull rod (7), the dowel plate (9) is connected to a chest expander (3) through a dowel rod (1), and the chest expander (3) is arranged on the supporting frame (4);
the clamping ring (8) is formed by splicing two semicircular arc plates (14), a stress side plate (15) is fixed around the clamping ring (8), and the stress side plate (15) is connected with the pull rod (7); the support frame (4) is of an inverted U shape, a first round hole (11) used for penetrating through the dowel bar (1) is formed in the center of the support frame (4), a side plate (10) is fixed at the bottom end of the support frame, and a second round hole (12) used for fixing the support frame (4) on the concrete spraying device (6) is formed in the side plate (10).
2. The device for measuring the bonding strength of the sprayed concrete and the surrounding rock as claimed in claim 1, wherein the number of the stressed side plates (15) on the snap ring (8) is 3, and each stressed side plate (15) is provided with a third round hole (13); the center of the dowel plate (9) is provided with a fifth round hole (18) used for penetrating through the dowel rod (1), the dowel plate (9) is also provided with 3 fourth round holes (17), and a pull rod (7) is connected between each fourth round hole (17) and the corresponding third round hole (13).
3. The device for measuring the bonding strength of the shotcrete and the surrounding rock according to claim 2, wherein the stressed side plates (15) on the clamping ring (8) are spaced by 120 degrees and are uniformly distributed on the clamping ring (8).
4. The device for measuring the bonding strength of the sprayed concrete and the surrounding rock according to claim 1, wherein the chest expander (3) adopts a digital display anchor rod drawing instrument with the maximum measuring range of 100KN and the precision of 0.01 KN.
5. The device for measuring the bonding strength of the shotcrete and the surrounding rock according to claim 1, wherein the two semicircular plates (14) of the snap ring (8) are fixed by the connecting bolt (16).
6. The device for measuring the bonding strength of the sprayed concrete and the surrounding rock according to claim 1, wherein a locking anchorage (2) is further arranged on the dowel bar (1), and the locking anchorage (2) is used for stabilizing the tension device (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921495159.XU CN210742096U (en) | 2019-09-10 | 2019-09-10 | Device for measuring bonding strength of sprayed concrete and surrounding rock |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921495159.XU CN210742096U (en) | 2019-09-10 | 2019-09-10 | Device for measuring bonding strength of sprayed concrete and surrounding rock |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514585A (en) * | 2019-09-10 | 2019-11-29 | 中国水利水电第五工程局有限公司 | A kind of gunite concrete and country rock adhesion strength measurement device |
| CN112816322A (en) * | 2020-12-28 | 2021-05-18 | 同济大学 | Wood transverse grain tensile strength detection device and field test method |
| CN113252552A (en) * | 2021-04-13 | 2021-08-13 | 中铁十二局集团有限公司 | Test method for detecting bonding strength between sprayed concrete and surrounding rock |
-
2019
- 2019-09-10 CN CN201921495159.XU patent/CN210742096U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514585A (en) * | 2019-09-10 | 2019-11-29 | 中国水利水电第五工程局有限公司 | A kind of gunite concrete and country rock adhesion strength measurement device |
| CN110514585B (en) * | 2019-09-10 | 2024-07-23 | 中国水利水电第五工程局有限公司 | Sprayed concrete and surrounding rock bonding strength measuring device |
| CN112816322A (en) * | 2020-12-28 | 2021-05-18 | 同济大学 | Wood transverse grain tensile strength detection device and field test method |
| CN113252552A (en) * | 2021-04-13 | 2021-08-13 | 中铁十二局集团有限公司 | Test method for detecting bonding strength between sprayed concrete and surrounding rock |
| CN113252552B (en) * | 2021-04-13 | 2022-11-08 | 中铁十二局集团有限公司 | Test method for detecting bonding strength between sprayed concrete and surrounding rock |
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