Device for evaluating dynamic stability of self-compacting concrete

Abstract

The utility model relates to the technical field of self-compacting concrete, and discloses a self-compacting concrete dynamic stability evaluation device which comprises a closed mold cavity bottom plate, a fixing mechanism arranged outside the closed mold cavity bottom plate and a synchronizing mechanism arranged inside the fixing mechanism. The fixing mechanism comprises a closed mold cavity top plate mounted at the top of the closed mold cavity bottom plate in an embedded manner, a shell fixedly mounted at the bottom of the closed mold cavity bottom plate, and four lifting cylinders fixedly mounted at the top of the shell; the L-shaped cylinders are slidably mounted in the four lifting cylinders respectively; and the stability evaluation mechanism is used for pouring the self-compacting concrete. According to the dynamic stability evaluation device for the self-compacting concrete, by arranging the fixing mechanism, the purpose of connecting and fixing the closed mold cavity bottom plate and the closed mold cavity top plate is achieved, leakage of a gap between the closed mold cavity bottom plate and the closed mold cavity top plate is prevented, and the use requirement of a user is met.

Description

Technical Field

[0001] The utility model relates to the technical field of self-compacting concrete, in particular to a self-compacting concrete dynamic stability evaluation device. Background Art

[0002] Self-compacting concrete is a type of concrete that can achieve compaction by relying on its own fluidity and filling properties without the need for vibration. Its advantage is that it can reduce labor intensity during construction and improve construction efficiency. It also has good uniformity and compactness, thereby improving the durability of the structure. Dynamic stability refers to the ability of a material to maintain its shape and structure unchanged under the action of external forces. For self-compacting concrete, its dynamic stability is directly related to its application effect and safety in actual engineering.

[0003] According to the announcement number CN104360047B, a method and device for evaluating the dynamic stability of self-compacting concrete in a closed mold cavity of a ballastless track is proposed. The method and device for evaluating the dynamic stability of self-compacting concrete in a closed mold cavity of a ballastless track can truly simulate the flow state of self-compacting concrete in a closed mold cavity of a ballastless track and under multiple obstacles, and can objectively reflect the essence of the dynamic stability of self-compacting concrete. The test equipment is simple and the test method is convenient. It is not only suitable for the preparation of self-compacting concrete in the laboratory, but also suitable for the quality control of self-compacting concrete on the construction site. It can replace the process simulation test of self-compacting concrete for CRTSIII type ballastless track and reduce the number of times the plate is removed.

[0004] However, the method and device for evaluating the dynamic stability of self-compacting concrete in a closed mold cavity of a ballastless track require the disassembly of the closed mold cavity bottom plate, and the closed mold cavity bottom plate is not firmly fixed, which will cause the self-compacting concrete to leak and affect the accuracy of the dynamic stability evaluation of the self-compacting concrete. Therefore, a dynamic stability evaluation device for self-compacting concrete is proposed to solve the above problem. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a device for evaluating the dynamic stability of self-compacting concrete, which has the advantage of quickly disassembling the closed mold cavity bottom plate, and solves the problem that the closed mold cavity bottom plate needs to be disassembled in the method and device for evaluating the dynamic stability of self-compacting concrete in the closed mold cavity of the slab ballastless track, and the closed mold cavity bottom plate is not firmly fixed, which will cause the self-compacting concrete to leak and affect the accuracy of the dynamic stability evaluation of the self-compacting concrete.

[0006] In summary, the utility model provides the following technical solutions: a self-compacting concrete dynamic stability evaluation device, comprising a closed mold cavity bottom plate, a fixing mechanism arranged outside the closed mold cavity bottom plate, and a synchronization mechanism arranged inside the fixing mechanism;

[0007] The fixing mechanism includes a closed mold cavity top plate mounted on the top of the closed mold cavity bottom plate, a shell fixedly mounted on the bottom of the closed mold cavity bottom plate, four lifting cylinders fixedly mounted on the top of the shell, L-shaped cylinders slidably mounted inside the four lifting cylinders, and a stability evaluation mechanism for pouring self-compacting concrete;

[0008] The stability evaluation mechanism includes four positioning sleeves fixedly installed on the top of the closed mold cavity top plate, a conical hopper embedded in the four positioning sleeves, a perfusion pipe fixedly installed on the top of the closed mold cavity top plate, and two observation tubes fixedly installed on the top of the closed mold cavity top plate.

[0009] The utility model adopts the above technical scheme and is provided with a fixing mechanism to achieve the purpose of connecting and fixing the closed mold cavity bottom plate and the closed mold cavity top plate, thereby preventing leakage from the gap between the closed mold cavity bottom plate and the closed mold cavity top plate and meeting the user's usage needs.

[0010] Furthermore, the synchronization mechanism includes a worm rotatably mounted on the rear side wall of the inner cavity of the shell, two synchronization rods rotatably mounted on the inner wall of the shell, and worm wheels fixedly mounted on the outer surfaces of the two synchronization rods respectively.

[0011] The utility model adopts the technical solution and is provided with a synchronization mechanism to drive the four L-shaped cylinders to rise and fall synchronously, thereby ensuring the accuracy of the dynamic stability evaluation of the self-compacting concrete and facilitating the use of the user.

[0012] Furthermore, two connecting plates are fixedly installed on the left and right sides of the closed mold cavity top plate, and U-shaped grooves are opened inside the four connecting plates. The inner surfaces of the four U-shaped grooves are respectively embedded and installed with the outer surfaces of the four L-shaped cylinders.

[0013] The beneficial effect of adopting the above further solution is that the L-shaped cylinder connects and fixes the closed mold cavity top plate and the closed mold cavity bottom plate through the connecting plate.

[0014] Furthermore, L-shaped slide grooves are provided on the left and right side walls of the inner cavity of the lifting cylinder, and sliders are fixedly installed on the left and right sides of the L-shaped cylinder, and the outer surfaces of the two sliders are respectively slidably connected to the inner surfaces of the two L-shaped slide grooves.

[0015] The beneficial effect of adopting the above further solution is that the slider is restricted by the L-shaped sliding groove so that the L-shaped cylinder first rotates 90 degrees and then descends.

[0016] Furthermore, the closed mold cavity bottom plate, the closed mold cavity top plate, the perfusion tube and the two observation tubes are all made of transparent organic glass.

[0017] The beneficial effect of adopting the above further solution is that the transparent organic glass facilitates the naked eye observation of the dynamics of the self-compacting concrete.

[0018] Furthermore, two vertical bevel gears are fixedly mounted on the outer surfaces of the two synchronization rods, and the outer surfaces of the two worm wheels are meshed with the outer surface of the worm.

[0019] The beneficial effect of adopting the above further solution is that the worm drives the two synchronous rods to rotate through the two worm wheels.

[0020] Furthermore, four threaded rods are rotatably mounted on the inner bottom wall of the shell, and the outer surfaces of the four threaded rods are respectively connected to the inner threads of the four L-shaped cylinders.

[0021] The beneficial effect of adopting the above further solution is that the threaded rod drives the L-shaped cylinder to rotate and descend.

[0022] Furthermore, transverse bevel gears are fixedly mounted on the outer surfaces of the four threaded rods, and the outer surfaces of the four transverse bevel gears are respectively meshed with the outer surfaces of the four vertical bevel gears.

[0023] The beneficial effect of adopting the above further solution is that the four vertical bevel gears drive the four transverse bevel gears to rotate.

[0024] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0025] The self-compacting concrete dynamic stability evaluation device, by being provided with a fixing mechanism, achieves the purpose of connecting and fixing the closed mold cavity bottom plate and the closed mold cavity top plate, prevents leakage from the gap between the closed mold cavity bottom plate and the closed mold cavity top plate, and meets the user's use needs. By being provided with a synchronization mechanism, it plays a role in driving the synchronous lifting and lowering of four L-shaped cylinders, thereby ensuring the accuracy of the dynamic stability evaluation of the self-compacting concrete and facilitating the use of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the utility model;

[0027] Figure 2 The utility model structure Figure 1 A top view of a cross section;

[0028] Figure 3 It is a front view cross-sectional stereoscopic diagram of the lifting cylinder of the utility model structure.

[0029] Description of reference numerals:

[0030] 1. Closed mold cavity bottom plate; 2. Fixing mechanism; 201. Closed mold cavity top plate; 202. Shell; 203. Lifting cylinder; 204. L-shaped cylinder; 205. Slider; 206. Injection pipe; 207. Positioning sleeve; 208. Conical hopper; 209. Observation tube; 3. Synchronizing mechanism; 301. Worm; 302. Synchronizing rod; 303. Worm wheel; 304. Vertical bevel gear; 305. Threaded rod; 306. Horizontal bevel gear. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] See also Figure 1 In this embodiment, a self-compacting concrete dynamic stability evaluation device includes a closed mold cavity bottom plate 1, a fixing mechanism 2 arranged outside the closed mold cavity bottom plate 1 and a synchronization mechanism 3 arranged inside the fixing mechanism 2, the fixing mechanism 2 includes a closed mold cavity top plate 201 embedded and installed on the top of the closed mold cavity bottom plate 1, a shell 202 fixedly installed on the bottom of the closed mold cavity bottom plate 1, four lifting cylinders 203 fixedly installed on the top of the shell 202, L-shaped cylinders 204 respectively slidably installed inside the four lifting cylinders 203 and a stability evaluation mechanism for pouring self-compacting concrete, and the L-shaped cylinder 204 is rotated and lifted inside the lifting cylinder 203 through a slider 205.

[0033] Among them, two connecting plates are fixedly installed on the left and right sides of the closed mold cavity top plate 201, and U-shaped grooves are opened inside the four connecting plates. The inner surfaces of the four U-shaped grooves are respectively embedded in the outer surfaces of the four L-shaped cylinders 204, and the L-shaped cylinders 204 are connected and fixed to the closed mold cavity top plate 201 and the closed mold cavity bottom plate 1 through the connecting plates.

[0034] Among them, L-shaped sliding grooves are opened on the left and right side walls of the inner cavity of the lifting cylinder 203, and sliders 205 are fixedly installed on the left and right sides of the L-shaped cylinder 204. The outer surfaces of the two sliders 205 are slidingly connected with the inner surfaces of the two L-shaped sliding grooves respectively. The L-shaped cylinder 204 rotates ninety degrees inside the L-shaped sliding groove, and then the L-shaped cylinder 204 cannot rotate due to the restriction of the sliders 205, so that the threaded rod 305 drives the L-shaped cylinder 204 to descend.

[0035] Among them, the stability evaluation mechanism includes four positioning sleeves 207 fixedly installed on the top of the closed mold cavity top plate 201, a conical hopper 208 embedded in the four positioning sleeves 207, a pouring pipe 206 fixedly installed on the top of the closed mold cavity top plate 201 and two observation tubes 209 fixedly installed on the top of the closed mold cavity top plate 201. The closed mold cavity bottom plate 1, the closed mold cavity top plate 201, the pouring pipe 206 and the two observation tubes 209 are all made of transparent plexiglass, which is convenient for naked eye observation of the dynamics of the self-compacting concrete.

[0036] Specifically, the four threaded rods 305 respectively drive the L-shaped cylinder 204 to rotate ninety degrees inside the L-shaped slide groove, and then the L-shaped cylinder 204 cannot rotate due to the restriction of the slider 205, so that the threaded rod 305 drives the L-shaped cylinder 204 to descend, so that the L-shaped cylinder 204 connects and fixes the closed mold cavity top plate 201 and the closed mold cavity bottom plate 1, preventing the gap between the closed mold cavity bottom plate 1 and the closed mold cavity top plate 201 from leaking, thereby meeting the user's usage requirements.

[0037] See also Figure 2 and Figure 3 The synchronization mechanism 3 includes a worm 301 rotatably mounted on the rear side wall of the inner cavity of the housing 202, two synchronization rods 302 rotatably mounted on the inner wall of the housing 202, and worm wheels 303 fixedly mounted on the outer surfaces of the two synchronization rods 302 respectively. Two vertical bevel gears 304 are fixedly mounted on the outer surfaces of the two synchronization rods 302. The outer surfaces of the two worm wheels 303 are meshed with the outer surfaces of the worm 301. The worm 301 drives the two synchronization rods 302 to rotate through the two worm wheels 303.

[0038] Among them, four threaded rods 305 are rotatably installed on the inner bottom wall of the outer shell 202, and the outer surfaces of the four threaded rods 305 are respectively connected to the internal threads of the four L-shaped cylinders 204, and the outer surfaces of the four threaded rods 305 are fixedly installed with transverse bevel gears 306, and the outer surfaces of the four transverse bevel gears 306 are respectively meshed with the outer surfaces of the four vertical bevel gears 304. The two synchronization rods 302 drive the four transverse bevel gears 306 and the four threaded rods 305 to rotate through the four vertical bevel gears 304.

[0039] Specifically, a steel mesh is constructed on the closed mold cavity bottom plate 1, and the closed mold cavity top plate 201 is covered on the closed mold cavity bottom plate 1. The worm 301 is rotated by hand, and the worm 301 drives two synchronization rods 302 to rotate through two worm wheels 303. The two synchronization rods 302 drive four horizontal bevel gears 306 and four threaded rods 305 to rotate through four vertical bevel gears 304, thereby ensuring the accuracy of the dynamic stability evaluation of the self-compacting concrete and facilitating the use of the users.

[0040] The working principle of the above embodiment is:

[0041] (1) When evaluating the dynamic stability of self-compacting concrete, a steel mesh is constructed on the closed cavity bottom plate 1, and the closed cavity top plate 201 is covered on the closed cavity bottom plate 1. The worm 301 is rotated by hand, and the worm 301 drives the two synchronization rods 302 to rotate through the two worm gears 303. The two synchronization rods 302 drive the four horizontal bevel gears 306 and the four threaded rods 305 to rotate through the four vertical bevel gears 304.

[0042] (2) The four threaded rods 305 drive the L-shaped cylinder 204 to rotate ninety degrees inside the L-shaped slide groove respectively, and then the L-shaped cylinder 204 cannot rotate due to the restriction of the slider 205, so that the threaded rods 305 drive the L-shaped cylinder 204 to descend, so that the L-shaped cylinder 204 connects and fixes the closed mold cavity top plate 201 and the closed mold cavity bottom plate 1.

[0043] (3) The self-compacting concrete mixture is loaded into the conical hopper 208, and the self-compacting concrete mixture is allowed to freely fall from the pouring pipe 206 into the closed mold cavity top plate 201. The self-compacting concrete mixture flows freely inside the closed mold cavity top plate 201. When the self-compacting concrete reaches four sides, it will gradually contact the upper surface of the closed mold cavity top plate 201. When it reaches a certain level, the mixture will overflow from the observation tube 209. When the mixture overflows the observation tube 209 by ten centimeters, the pouring is stopped and the self-compacting concrete just prepared is weighed. The mixture and the mixture at 20 cm from the end of the closed mold cavity top plate 201 are sieved with a 5mm square hole sieve, and the difference in the proportion of mortar under the sieve to concrete of the two mixtures is calculated. When the difference in slurry is less than 10%, the dynamic stability of the self-compacting concrete is good. After standing for 15 minutes, the penetration of the observation tube 209 and the injection tube 206 is tested with a needle penetration meter. After the needle penetration head is placed for 15 to 20 seconds, the penetration depth of the needle penetration meter is read. When the penetration depth of the needle penetration meter is less than 20 mm, the self-compacting concrete mixture has good stability.

Claims

1. A self-compacting concrete dynamic stability evaluation device, characterized in that: It comprises a closed mold cavity bottom plate (1), a fixing mechanism (2) arranged outside the closed mold cavity bottom plate (1), and a synchronization mechanism (3) arranged inside the fixing mechanism (2); The fixing mechanism (2) comprises a closed mold cavity top plate (201) mounted on the top of the closed mold cavity bottom plate (1), a shell (202) fixedly mounted on the bottom of the closed mold cavity bottom plate (1), four lifting cylinders (203) fixedly mounted on the top of the shell (202), L-shaped cylinders (204) slidably mounted inside the four lifting cylinders (203), and a stability evaluation mechanism for pouring self-compacting concrete; The stability evaluation mechanism comprises four positioning sleeves (207) fixedly mounted on the top of the closed mold cavity top plate (201), a conical hopper (208) embedded in the four positioning sleeves (207), a pouring pipe (206) fixedly mounted on the top of the closed mold cavity top plate (201), and two observation tubes (209) fixedly mounted on the top of the closed mold cavity top plate (201).

2. A self-compacting concrete dynamic stability evaluation device according to claim 1, characterized in that: The synchronization mechanism (3) comprises a worm (301) rotatably mounted on the rear side wall of the inner cavity of the housing (202), two synchronization rods (302) rotatably mounted on the inner wall of the housing (202), and worm wheels (303) respectively fixedly mounted on the outer surfaces of the two synchronization rods (302).

3. A self-compacting concrete dynamic stability evaluation device according to claim 1, characterized in that: Two connecting plates are fixedly mounted on both left and right sides of the closed cavity top plate (201), and U-shaped grooves are formed inside the four connecting plates. The inner surfaces of the four U-shaped grooves are respectively engaged with the outer surfaces of the four L-shaped cylinders (204).

4. A self-compacting concrete dynamic stability evaluation device according to claim 1, characterized in that: L-shaped sliding grooves are provided on both left and right side walls of the inner cavity of the lifting cylinder (203), and sliding blocks (205) are fixedly installed on both left and right sides of the L-shaped cylinder (204), and the outer surfaces of the two sliding blocks (205) are respectively slidably connected to the inner surfaces of the two L-shaped sliding grooves.

5. The self-compacting concrete dynamic stability evaluation device according to claim 1, characterized in that: The closed mold cavity bottom plate (1), the closed mold cavity top plate (201), the infusion tube (206) and the two observation tubes (209) are all made of transparent organic glass.

6. A self-compacting concrete dynamic stability evaluation device according to claim 2, characterized in that: Two vertical bevel gears (304) are fixedly mounted on the outer surfaces of the two synchronization rods (302), and the outer surfaces of the two worm wheels (303) are meshed with the outer surface of the worm (301).

7. A self-compacting concrete dynamic stability evaluation device according to claim 2, characterized in that: Four threaded rods (305) are rotatably mounted on the inner bottom wall of the outer shell (202), and the outer surfaces of the four threaded rods (305) are respectively connected to the inner threads of the four L-shaped cylinders (204).

8. A self-compacting concrete dynamic stability evaluation device according to claim 7, characterized in that: A transverse bevel gear (306) is fixedly mounted on the outer surfaces of the four threaded rods (305), and the outer surfaces of the four transverse bevel gears (306) are respectively meshed with the outer surfaces of the four vertical bevel gears (304).

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