Steel fiber concrete tunnel segment preparation device

Abstract

The utility model relates to the field of tunnel engineering construction, and discloses a steel fiber concrete tunnel segment preparation device which comprises a feeding hopper, one side of the feeding hopper is fixedly connected with a transverse rod, one end of the transverse rod is fixedly connected with a stand column, and a steel fiber inlet is formed in the feeding hopper. The bottom of the steel fiber inlet is fixedly connected with a machine shell, a vibrator is arranged in the machine shell, the bottom of the machine shell is fixedly connected with a working table, a rotating motor is arranged in the working table, the output end of the rotating motor is fixedly connected with an electromagnet, and the vibrator is rotationally connected into the working table. A plurality of fixing assemblies are arranged on the outer wall of the machine shell. According to the utility model, the device can adapt to actual engineering requirements, can automatically produce steel fiber reinforced concrete pipe pieces with different sizes, and can effectively ensure and improve the quality and performance of the pure steel fiber reinforced concrete pipe pieces by utilizing the universal electromagnetic device and the elastic shrinkage type vibrating platform to control the distribution of steel fibers.

Description

Technical Field

[0001] The utility model relates to the field of tunnel engineering construction, in particular to a steel fiber concrete tunnel segment preparation device. Background Art

[0002] In order to ease the tight situation of urban ground space and improve land utilization, the development of urban underground space is receiving more and more attention from urban planning and construction departments. In particular, the construction and improvement of underground structures such as subways, underground comprehensive pipelines, and municipal tunnels have gradually become an important criterion for measuring the level of urban development. The comprehensive development and utilization of underground space resources has become a hot area for engineering construction projects.

[0003] Shield construction is usually used in urban tunnel construction. Shield segments are the main assembly components in shield construction. They need to bear the water and soil pressure and special loads that the tunnel is subjected to during construction and operation. They are permanent assembly components of underground projects. The performance of the segments determines the quality and safety of the tunnel project. At the same time, the cost of the shield tunnel lining structure accounts for about 40% of the total cost of the entire tunnel project, which mainly includes the production and construction costs of the segments. Therefore, the selection of segment materials directly determines the project cost. Reinforced concrete segments are widely used for their good compressive performance and high economy. However, with the upgrading and transformation of engineering structures, the shortcomings of traditional reinforced concrete segments have gradually emerged. Reinforced concrete segments are large in size, and transportation and construction and installation are inconvenient. In addition, the tensile strength index of concrete is low, and it is very easy to cause damage and cracks during construction and operation, resulting in water seepage and steel corrosion. In the long run, the safety and durability of the segment structure cannot be guaranteed.

[0004] Steel fiber concrete is a new type of composite material that can be cast and sprayed by infiltrating a certain amount of randomly distributed short steel fibers into ordinary concrete. Compared with ordinary concrete, it has advantages in strength and durability, and can significantly improve shear and tensile strength, especially tensile strength after cracking; therefore, it can improve the resistance to jack thrust, reduce construction cracks, increase the bearing capacity of each limit state, extend the service life, reduce maintenance costs during the service life, and improve the use environment;

[0005] In the actual production process, when steel fibers are added to the concrete mixture, "agglomeration" will occur, causing the steel fiber concrete mixture to be unable to flow, interfering with vibration, and causing uneven density of steel fibers. The aggregation of internal defects directly affects the mechanical properties of the concrete segment. According to the basic principles of electromagnetism, the magnetic field can control the direction of positive and negative electrons in the iron element, thereby controlling the direction of steel fibers in the pure steel fiber concrete segment, effectively ensuring and improving the quality and performance of the pure steel fiber concrete segment and saving costs. Utility Model Content

[0006] In order to make up for the above shortcomings, the utility model provides a steel fiber concrete tunnel segment preparation device, which aims to improve the problem that conventional segments prepared by the equipment are large in size and inconvenient in transportation, construction and installation.

[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a steel fiber concrete tunnel segment preparation device, including a feeding funnel, a cross bar is fixedly connected to one side of the feeding funnel, a column is fixedly connected to one end of the cross bar, a steel fiber inlet is opened inside the feeding funnel, the bottom of the steel fiber inlet is fixedly connected to a machine casing, a vibrator is arranged inside the machine casing, a workbench is fixedly connected to the bottom of the machine casing, a rotating motor is arranged inside the workbench, an electromagnet is fixedly connected to the output end of the rotating motor, the vibrator is rotatably connected to the inside of the workbench, and a plurality of fixed components are arranged on the outer wall of the machine casing.

[0008] As a further description of the above technical solution:

[0009] The fixing assembly comprises a clamp, a metal tie is arranged between the clamps, a high-strength bolt is threadedly connected inside the clamp, and the clamp and the metal tie are connected by the high-strength bolt.

[0010] As a further description of the above technical solution:

[0011] The clamp is arranged on the outer wall of the casing, and a plurality of the clamps are arranged in a centrally symmetrical manner.

[0012] As a further description of the above technical solution:

[0013] The bottom of the vibrator is fixedly connected with a vertical rod, which passes through the workbench and extends to the outside.

[0014] As a further description of the above technical solution:

[0015] A bottom plate is arranged at the bottom of the workbench, and a hydraulic jack is arranged at the top of the bottom plate.

[0016] As a further description of the above technical solution:

[0017] The output end of the hydraulic jack is fixedly connected to the bottom of the workbench, and the hydraulic jacks are distributed in a rectangular array according to the length of the bottom plate.

[0018] As a further description of the above technical solution:

[0019] The outer wall of the vertical rod is sleeved with a spring.

[0020] As a further description of the above technical solution:

[0021] One end of the spring is fixedly connected to the bottom of the workbench, and the other end of the spring is fixedly connected to the top of the bottom plate.

[0022] The utility model has the following beneficial effects:

[0023] 1. In the utility model, firstly, the concrete feed port and the steel fibers are dispersedly arranged, and the dispersion between the steel fibers is finely controlled by the flow rate and wind speed, thereby avoiding the mixing and agglomeration of the steel fibers and improving the uniformity of the steel fibers in the concrete segment.

[0024] 2. In the utility model, the magnetic field generated by the rotation of the universal electromagnet improves the dispersion and uniformity of the steel fiber in the concrete mixture space; on the other hand, the bottom elastic vibrator vibrates under the constraint of the limiter, which improves the spatial anisotropic distribution of the steel fiber in the concrete and greatly reduces the agglomeration and sinking of the steel fiber.

[0025] 3. In the utility model, the separate workbench can meet the production needs of concrete segments of different sizes. It is simple to operate, reasonable in design, and highly versatile. It can ensure the dispersion and uniformity of steel fibers in a limited space, hinder the expansion of microcracks inside the concrete and the occurrence and development of macrocracks, and improve the durability and corrosion resistance of the concrete segments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a steel fiber concrete tunnel segment preparation device proposed in the utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of a feed hopper of a steel fiber concrete tunnel segment preparation device proposed in the utility model;

[0028] Figure 3 This is a schematic diagram of the fixing components of a steel fiber concrete tunnel segment preparation device proposed in the utility model.

[0029] Legend:

[0030] 1. Feed hopper; 2. Cross bar; 3. Column; 4. Steel fiber inlet; 5. Clamp; 6. Casing; 7. Electromagnet; 8. Vibrator; 9. Rotating motor; 10. Workbench; 11. Vertical bar; 12. Spring; 13. Hydraulic jack; 14. Bottom plate; 15. Metal tie; 16. High-strength bolts. 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] Reference Figure 1-Figure 3 , the utility model provides an embodiment: a steel fiber concrete tunnel segment preparation device, including a feeding funnel 1, a cross bar 2 is fixedly connected to one side of the feeding funnel 1, a column 3 is fixedly connected to one end of the cross bar 2, a steel fiber inlet 4 is opened inside the feeding funnel 1, the bottom of the steel fiber inlet 4 is fixedly connected to a housing 6, a vibrator 8 is arranged inside the housing 6, a workbench 10 is fixedly connected to the bottom of the housing 6, a rotating motor 9 is arranged inside the workbench 10, an electromagnet 7 is fixedly connected to the output end of the rotating motor 9, the vibrator 8 is rotatably connected to the inside of the workbench 10, and a plurality of fixed components are arranged on the outer wall of the housing 6;

[0033] Specifically, the casing 6 is assembled with the tie clamp 5 through the cooperation of high-strength bolts 16 and metal ties 15. This process ensures that the structure of the casing 6 is firm and reliable. Subsequently, the casing 6 is placed at the bottom of the feed hopper 1 to prepare for subsequent work; then, cement, fine aggregate, coarse aggregate and a small amount of admixture are added according to the prescribed ratio, mixed with clean water, and poured into the mixer for sufficient mixing. Steel fiber and concrete are gradually poured from the feed hopper 1 so that they enter the casing 6 through the steel fiber inlet 4. The position of the workbench 10 is adjusted by the hydraulic jack 13 so that the bottom elastic vibrator 8 reaches the specified height. The bottom limiter of the vibrator 8 is adjusted to ensure that the vibrator 8 rotates horizontally on the workbench 10 without exceeding the template limit; then, the vibrator 8 is started to start vibrating, and the rotating motor 9 is started at the same time to drive the electromagnet 7 to rotate to ensure that the steel fiber and concrete are evenly mixed in the casing 6. Through the reaction of the electromagnet 7, the surface of the mixture is flat, and the surface deviation does not exceed 3mm. After the work is completed, the rotating motor 9 is turned off, and after waiting for 24 hours, the clamp 5 is disassembled, the casing 6 is removed, and the mold removal operation is performed to complete the preparation process.

[0034] The fixing assembly includes a clamp 5, a metal tie 15 is arranged between the clamps 5, a high-strength bolt 16 is threadedly connected inside the clamp 5, the clamp 5 and the metal tie 15 are connected by the high-strength bolt 16, the clamp 5 is arranged on the outer wall of the casing 6, and a plurality of clamps 5 are arranged symmetrically at the center, a vertical rod 11 is fixedly connected to the bottom of the vibrator 8, the vertical rod 11 passes through the workbench 10 and extends to the outside, a bottom plate 14 is arranged at the bottom of the workbench 10, a hydraulic jack 13 is arranged on the top of the bottom plate 14, an output end of the hydraulic jack 13 is fixedly connected to the bottom of the workbench 10, and the hydraulic jacks 13 are distributed in a rectangular array according to the length of the bottom plate 14, a spring 12 is sleeved on the outer wall of the vertical rod 11, one end of the spring 12 is fixedly connected to the bottom of the workbench 10, and the other end of the spring 12 is fixedly connected to the top of the bottom plate 14;

[0035] Specifically, the mold composed of the casing 6 can be better fixed by multiple clamps 5, the vibrator 8 can be simply restricted by the vertical rod 11, the height of the corresponding workbench 10 can be stably controlled by multiple hydraulic jacks 13, and the upper and lower positions can be simply limited by the springs 12 and certain protection can be provided.

[0036] Working principle: When preparing concrete segments, first assemble the casing 6 with the clamp 5 according to the corresponding specifications through the cooperation of high-strength bolts 16 and metal ties 15, and place the casing 6 at the bottom of the feed hopper 1. After the casing 6 is assembled, a certain proportion of cement, fine aggregate, coarse aggregate and a small amount of admixture are added to the water and mixed into the mixer. Pour the steel fiber and concrete in batches from the feed hopper 1 so that they enter the casing 6 from the steel fiber inlet 4, and then use the hydraulic jack 13 to adjust the position of the workbench 10, and make the bottom elastic vibrator 8 enters the specified height, and then adjusts the bottom limiter of the vibrator 8 so that the vibrator 8 can rotate horizontally on the workbench 10 without exceeding the template limit. Then start the vibrator 8 at this time to make the vibrator 8 start to vibrate, and at the same time start the rotating motor 9 to drive the electromagnet 7 to rotate, so that the steel fiber and concrete in the casing 6 can be evenly mixed, and through the electromagnetic reaction of the whole building and the electromagnet 7, the surface of the mixture is flat, and the surface deviation does not exceed 3mm. At this time, turn off the rotating motor 9, wait for 24 hours, remove the casing 6 by removing the clamp 5 to remove the mold, and complete the preparation.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel fiber reinforced concrete tunnel segment preparation device, comprising a feed hopper (1), characterized in that: A cross bar (2) is fixedly connected to one side of the feed hopper (1), and a column (3) is fixedly connected to one end of the cross bar (2). A steel fiber inlet (4) is provided inside the feed hopper (1), and a housing (6) is fixedly connected to the bottom of the steel fiber inlet (4). A vibrator (8) is provided inside the housing (6), and a workbench (10) is fixedly connected to the bottom of the housing (6). A rotating motor (9) is provided inside the workbench (10), and an electromagnet (7) is fixedly connected to the output end of the rotating motor (9). The vibrator (8) is rotatably connected to the inside of the workbench (10), and a plurality of fixed components are provided on the outer wall of the housing (6).

2. The steel fiber concrete tunnel segment preparation device according to claim 1, characterized in that: The fixing assembly comprises a clamp (5), a metal tie (15) is arranged between the clamps (5), a high-strength bolt (16) is threadedly connected inside the clamp (5), and the clamp (5) and the metal tie (15) are connected via the high-strength bolt (16).

3. The steel fiber concrete tunnel segment preparation device according to claim 2, characterized in that: The clamp (5) is arranged on the outer wall of the casing (6), and a plurality of the clamps (5) are arranged in a centrally symmetrical manner.

4. The steel fiber concrete tunnel segment preparation device according to claim 1, characterized in that: The bottom of the vibrator (8) is fixedly connected with a vertical rod (11), and the vertical rod (11) passes through the workbench (10) and extends to the outside.

5. The steel fiber concrete tunnel segment preparation device according to claim 1, characterized in that: A bottom plate (14) is arranged at the bottom of the workbench (10), and a hydraulic jack (13) is arranged at the top of the bottom plate (14).

6. The steel fiber concrete tunnel segment preparation device according to claim 5, characterized in that: The output end of the hydraulic jack (13) is fixedly connected to the bottom of the workbench (10), and the hydraulic jacks (13) are distributed in a rectangular array according to the length of the bottom plate (14).

7. The steel fiber concrete tunnel segment preparation device according to claim 4, characterized in that: The outer wall of the vertical rod (11) is sleeved with a spring (12).

8. The steel fiber concrete tunnel segment preparation device according to claim 7, characterized in that: One end of the spring (12) is fixedly connected to the bottom of the workbench (10), and the other end of the spring (12) is fixedly connected to the top of the base plate (14).

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