A template system for eliminating bubbles on the surface of a shield segment fair-faced concrete

Abstract

The utility model provides a kind of shield segment fair-faced concrete surface bubble elimination formwork system, it is related to shield segment field.The shield segment fair-faced concrete surface bubble elimination formwork system, including mould body and support frame, the inside of mould body includes end plate and side plate, the number of end plate is two, the number of side plate is two, support frame is fixedly connected mould body, the both ends of support frame are fixedly connected with extension frame, the inside rotationally connected with top cover of extension frame, the inboard of end plate is equipped with first inner lining, the inboard of side plate is equipped with second inner lining.In the utility model, it solves that high-frequency vibration and other means control bubble can be difficult to discharge due to specific factors, residual in concrete surface, form pitted surface, honeycomb and other defects, not only affect the appearance quality of segment, also possibly reduce the durability and structural performance of segment.

Description

Technical Field

[0001] This utility model relates to the field of tunnel lining segments, specifically a template system for eliminating air bubbles on the surface of fair-faced concrete of tunnel lining segments. Background Technology

[0002] In shield tunnel construction, the shield segments, as a crucial load-bearing structure, directly affect the overall aesthetics and long-term durability of the project. Fair-faced concrete, with its advantages of requiring no decoration and being environmentally friendly and energy-saving, is widely used in shield segment fabrication. However, during the concrete pouring process, surface defects such as air bubbles are highly susceptible to occur.

[0003] According to the existing technology, the industry generally uses high-frequency vibration and other methods to control air bubbles. However, factors such as the vibration method and the interface characteristics between the formwork and the concrete make it difficult for a large number of air bubbles to be discharged. These air bubbles remain on the concrete surface, forming defects such as pitting and honeycombing. This not only affects the appearance quality of the tunnel segments but may also reduce the durability and structural performance of the tunnel segments.

[0004] Therefore, those skilled in the art have provided a template system for eliminating air bubbles on the surface of fair-faced concrete of tunnel lining segments to solve the problems mentioned in the background art. Utility Model Content

[0005] 1. Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this application provides a template system for eliminating air bubbles on the surface of fair-faced concrete of tunnel segments. This system solves the problem that controlling air bubbles using methods such as high-frequency vibration can lead to a large number of air bubbles that are difficult to expel due to specific factors, leaving them on the concrete surface and forming defects such as pitting and honeycombing. This not only affects the appearance quality of the tunnel segments but may also reduce their durability and structural performance.

[0007] 2. Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A template system for eliminating air bubbles on the surface of fair-faced concrete of tunnel lining segments includes a mold body and a support frame. The mold body has two end plates and two side plates inside. The support frame is fixedly connected to the mold body. Extension frames are fixedly connected to both ends of the support frame. A top cover is rotatably connected inside the extension frames. A first inner lining layer is provided on the inner side of the end plates, and a second inner lining layer is provided on the inner side of the side plates. Multiple vent holes are provided inside the end plates and the side plates. A first vent pipe is provided on the side of the end plates, and a second vent pipe is provided on the side of the side plates. Multiple fixed brackets are fixedly connected to the inner side of the support frame.

[0010] The above technical solution allows for the elimination of air bubbles in the tunnel segments by first vibrating the concrete to accelerate the rising and expulsion of air bubbles. Then, the rising air bubbles are extracted through vacuum suction. This solves the problem that high-frequency vibration and other methods of controlling air bubbles can lead to a large number of air bubbles that are difficult to expel due to certain factors, leaving them on the concrete surface and forming defects such as pitting and honeycombing. This not only affects the appearance quality of the tunnel segments but may also reduce their durability and structural performance.

[0011] Furthermore, the mold body, end plates, side plates, and top cover are all made of Q355B steel plate, and the two end plates are located at one end of the mold body and are fixedly connected to the mold body.

[0012] Through the above technical solutions, the mold body, end plate, side plate and top cover are all processed into specific arc shapes by CNC bending process to fit the shape requirements of the shield tunnel segments. Q355B steel plate can withstand greater pressure during concrete pouring, ensuring the stability of the template and providing reliable external support for the formation of tunnel segments.

[0013] Furthermore, the two side plates are located on both sides of the mold body away from the two end plates. The side plates are rotatably connected to the support frame. Threaded holes are opened inside the connection between the side plates and the support frame, and bolts are threadedly connected inside the support frame.

[0014] The above technical solution allows for the removal of the movable side plate after the tunnel segment is poured, making it convenient for workers to disassemble the tunnel segment.

[0015] Furthermore, both the first inner liner and the second inner liner are made of PTFE microporous membrane. The first inner liner is bonded to the inner surface of the first inner liner with epoxy adhesive, and the second inner liner is bonded to the inner surface of the second inner liner with epoxy adhesive.

[0016] Through the above technical solution, the PTFE microporous membrane possesses excellent chemical stability, hydrophobicity, and a unique microporous structure. This microporous structure allows gas to pass through smoothly, while effectively blocking liquid components in the concrete, thus creating favorable conditions for bubble discharge.

[0017] Furthermore, a connecting pipe is provided between the adjacent ends of the first exhaust pipe and the second exhaust pipe. The connecting pipe is made of flexible hose, and its two ends are respectively connected to the first exhaust pipe and the second exhaust pipe.

[0018] The above technical solution allows for easy disassembly of the connecting pipe made of flexible material, enabling the separation of the first exhaust pipe from the second exhaust pipe for inspection and maintenance.

[0019] Furthermore, one of the connecting pipes has a through hole on its outer side and is fixedly connected to an air extraction pipe, and the end of the air extraction pipe away from the connecting pipe is connected to a vacuum pump.

[0020] Through the above technical solution, the vacuum pump can generate suction to extract air bubbles inside the template, thereby reducing the air bubble rate inside the concrete.

[0021] Furthermore, the exhaust port is provided with a suction head, and the plurality of suction heads are respectively connected to the first exhaust pipe and the second exhaust pipe;

[0022] With the above technical solution, multiple suction heads can be evenly distributed around the template to uniformly suck up air bubbles inside the template, avoiding dead corners that would cause some air bubbles to remain inside the concrete.

[0023] Furthermore, multiple fixed supports are evenly arrayed on the inner side of the support frame, a vibrator is fixedly connected to the top of the fixed supports, a vibrating block is fixedly connected to the output shaft of the vibrator, and the vibrating block is in contact with the mold body;

[0024] Through the above technical solutions, the vibrator can accelerate the rise and discharge of air bubbles in concrete. In synergy with the air bubble adsorption layer and vacuum suction device, it significantly improves the quality of the fair-faced concrete surface of the tunnel lining segments.

[0025] 3. Beneficial effects

[0026] This invention provides a template system for eliminating air bubbles on the surface of fair-faced concrete for tunnel lining segments. It offers the following advantages:

[0027] 1. This utility model provides a template system for eliminating air bubbles on the surface of fair-faced concrete of tunnel lining segments. Through the arrangement of a first inner lining layer, a second inner layer, vent holes, a first vent pipe, a second vent pipe, a connecting pipe, an extraction pipe, a vacuum pump, and a vibrator, the device can first vibrate the concrete to accelerate the rising and expulsion of internal air bubbles during air bubble elimination. Then, the rising air bubbles are extracted through vacuum suction. This solves the problem that high-frequency vibration and other methods of controlling air bubbles can lead to a large number of air bubbles remaining on the concrete surface due to specific factors, forming defects such as pitting and honeycombing. This not only affects the appearance quality of the tunnel lining segments but may also reduce their durability and structural performance.

[0028] 2. This utility model provides a template system for eliminating air bubbles on the surface of fair-faced concrete of tunnel segments. By setting up a first exhaust pipe, a second exhaust pipe, a suction head, and a connecting pipe, the device can suction around the entire mold body, avoiding dead corners that would result in poor air bubble removal. The connecting pipe also facilitates the disassembly of the first and second exhaust pipes, making subsequent maintenance or replacement easier and preventing the suction head from becoming clogged after prolonged use, which would affect air bubble removal. Attached Figure Description

[0029] Figure 1 This is an axial view schematic diagram of the present invention;

[0030] Figure 2 This is an axial view schematic diagram of the mold body of this utility model;

[0031] Figure 3 This is a top-axis view of the mold body of this utility model;

[0032] Figure 4 For the present utility model Figure 1 Enlarged view of point A;

[0033] Figure 5 This is a side-axis view of the present invention.

[0034] In the picture:

[0035] 1. Mold body; 2. Support frame; 3. End plate; 4. Side plate; 5. Extension frame; 6. Top cover; 7. First inner liner; 8. Second inner liner; 9. Vent hole; 10. First vent pipe; 11. Second vent pipe; 12. Connecting pipe; 13. Suction pipe; 14. Vacuum pump; 15. Fixed bracket; 16. Vibrator; 17. Vibrating block; 18. Suction head. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of specific embodiments. Obviously, the described specific embodiments are only a part of the specific embodiments of the present invention, and not all of them. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Specific implementation method 1:

[0038] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4This embodiment of a shield tunnel segment fair-faced concrete surface bubble elimination template system includes a mold body 1 and a support frame 2. The mold body 1 includes two end plates 3 and two side plates 4. The support frame 2 is fixedly connected to the mold body 1. Extension frames 5 are fixedly connected to both ends of the support frame 2. A top cover 6 is rotatably connected inside the extension frames 5. A first inner lining layer 7 is provided on the inner side of the end plates 3, and a second inner lining layer 8 is provided on the inner side of the side plates 4. Multiple vent holes 9 are opened inside the end plates 3 and the side plates 4. A first vent pipe 10 is provided on the side of the end plates 3, and a second vent pipe 11 is provided on the side of the side plates 4. Multiple fixed brackets 15 are fixedly connected to the inner side of the support frame 2. The mold body 1, end plates 3, side plates 4, and top cover 6 are all made of Q355B steel plate. The two end plates 3 are respectively located on the mold body 1. Two ends of the mold body 1 are fixedly connected to the mold body 1. Two side plates 4 are located on both sides of the mold body 1 away from the two end plates 3. The side plates 4 are rotatably connected to the support frame 2. The inside of the connection between the side plates 4 and the support frame 2 and the inside of the support frame 2 are provided with threaded holes and bolts are threadedly connected. The first inner liner 7 and the second inner liner 8 are both made of PTFE microporous membrane. The first inner liner 7 is bonded to the inner surface of the first inner liner 7 by epoxy adhesive. The second inner liner 8 is bonded to the inner surface of the second inner liner 8 by epoxy adhesive. The exhaust hole 9 is provided with a suction head 18. Multiple suction heads 18 are respectively connected to the first exhaust pipe 10 and the second exhaust pipe 11. Multiple fixed brackets 15 are evenly arrayed on the inner side of the support frame 2. The top of the fixed bracket 15 is fixedly connected to a vibrator 16. The output shaft of the vibrator 16 is fixedly connected to a vibration block 17. The vibration block 17 is in contact with the mold body 1. Specific implementation method 2:

[0040] Please see Figure 4 , Figure 5 In this embodiment, a template system for eliminating air bubbles on the surface of fair-faced concrete of tunnel segments is provided. A connecting pipe 12 is provided between the adjacent ends of the first exhaust pipe 10 and the second exhaust pipe 11. The connecting pipe 12 is made of flexible hose. The two ends of the connecting pipe 12 are respectively connected to the first exhaust pipe 10 and the second exhaust pipe 11. A through hole is opened on the outside of one of the connecting pipes 12 and a suction pipe 13 is fixedly connected thereto. The end of the suction pipe 13 away from the connecting pipe 12 is connected to a vacuum pump 14.

[0041] This embodiment describes a template system for eliminating air bubbles on the surface of fair-faced concrete for tunnel segments. It should be noted that the system, through the arrangement of a first inner lining layer 7, a second inner layer, vent holes 9, a first vent pipe 10, a second vent pipe 11, a connecting pipe 12, an extraction pipe 13, a vacuum pump 14, and a vibrator 16, allows the device to first vibrate the concrete during bubble elimination, accelerating the rising and expulsion of internal air bubbles. Then, the rising bubbles are extracted through vacuum suction. This solves the problem that high-frequency vibration and other methods of controlling air bubbles can lead to a large number of air bubbles being difficult to expel due to specific factors, resulting in residual air bubbles. Defects such as pitting and honeycombing remain on the concrete surface, affecting not only the appearance quality of the segments but also potentially reducing their durability and structural performance. The arrangement of the first exhaust pipe 10, the second exhaust pipe 11, the suction head 18, and the connecting pipe 12 allows the device to perform suction around the entire mold body 1, avoiding dead zones that could lead to poor air bubble removal. Furthermore, the connecting pipe 12 facilitates the disassembly of the first exhaust pipe 10 and the second exhaust pipe 11, enabling subsequent maintenance or replacement and preventing the suction head 18 from becoming clogged after prolonged use, thus ensuring effective air bubble removal.

[0042] The working principle of the above embodiment is as follows: When in use, check the integrity of the first inner lining layer 7 and the second inner lining layer 8, treat the surface with a special cleaning agent, and then place the steel frame inside the mold body 1. After placement and fixing of the steel frame, pour concrete into the mold body 1. When the amount of concrete poured reaches one-third, connect the top cover 6 to the mold body 1 to seal the mold body 1. After sealing, start the vibrator 16 to make the vibrating block 17 vibrate. Then the vibrating block 17 makes the mold body 1 vibrate. After the mold body 1 vibrates, the concrete vibrates, thereby causing the air bubbles inside the concrete to float up and be discharged. At this time, start the vacuum pump 14. The vacuum pump 14 generates suction and transmits the suction to the inside of the first exhaust pipe 10 and the second exhaust pipe 11 through the suction pipe 13 and the connecting pipe 12. Then the suction is used to draw the inside of the mold body 1 through the suction head 18. During the suction, a negative pressure environment of -0.08MPa is formed inside the mold body 1. Under the action of pressure difference, the bubbles migrate to the first inner lining layer 7 and the second inner lining layer 8. The gas passes through the internal membrane pores of the first inner lining layer 7 and the second inner lining layer 8 and enters the suction head 18 for discharge. The liquid components are blocked by the membrane structure. At this time, the vibrator 16 continues to vibrate to eliminate the bubbles inside the concrete. When the device has been used for a long time, the connecting pipe 12 can be pulled to separate the connecting pipe 12 from the first exhaust pipe 10 and the second exhaust pipe 11. After separation, the first exhaust pipe 10 and the second exhaust pipe 11 can be disassembled separately to detach them from the end plate 3 and the side plate 4. Then the first exhaust pipe 10 and the second exhaust pipe 11 can be inspected or repaired.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0044] Although specific embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these specific embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A template system for eliminating air bubbles on the surface of fair-faced concrete of tunnel lining segments, comprising a template body (1) and a support frame (2), characterized in that: The mold body (1) includes an end plate (3) and a side plate (4). There are two end plates (3) and two side plates (4). The support frame (2) is fixedly connected to the mold body (1). Both ends of the support frame (2) are fixedly connected to an extension frame (5). The extension frame (5) is rotatably connected to a top cover (6). The inner side of the end plate (3) is provided with a first inner lining layer (7). The inner side of the side plate (4) is provided with a second inner lining layer (8). Multiple exhaust holes (9) are opened in the interior of the end plate (3) and the interior of the side plate (4). The side of the end plate (3) is provided with a first exhaust pipe (10). The side of the side plate (4) is provided with a second exhaust pipe (11). Multiple fixed brackets (15) are fixedly connected to the inner side of the support frame (2).

2. The air bubble elimination template system for the surface of fair-faced concrete of tunnel segments according to claim 1, characterized in that: The mold body (1), end plate (3), side plate (4) and top cover (6) are all made of Q355B steel plate. The two end plates (3) are located at one end of the mold body (1) and are fixedly connected to the mold body (1).

3. The air bubble elimination template system for the surface of fair-faced concrete of tunnel segments according to claim 1, characterized in that: The two side plates (4) are located on both sides of the mold body (1) away from the two end plates (3). The side plates (4) are rotatably connected to the support frame (2). The inside of the connection between the side plates (4) and the support frame (2) and the inside of the support frame (2) are provided with threaded holes and bolts are threadedly connected.

4. The air bubble elimination template system for the surface of fair-faced concrete of tunnel segments according to claim 1, characterized in that: The first inner liner (7) and the second inner liner (8) are both made of PTFE microporous membrane. The first inner liner (7) is bonded to the inner surface of the first inner liner (7) by epoxy adhesive, and the second inner liner (8) is bonded to the inner surface of the second inner liner (8) by epoxy adhesive.

5. A template system for eliminating air bubbles on the surface of fair-faced concrete for tunnel segments according to claim 1, characterized in that: A connecting pipe (12) is provided between the first exhaust pipe (10) and the second exhaust pipe (11) at their adjacent ends. The connecting pipe (12) is made of a flexible hose, and its two ends are connected to the first exhaust pipe (10) and the second exhaust pipe (11) respectively.

6. A template system for eliminating air bubbles on the surface of fair-faced concrete for tunnel segments according to claim 5, characterized in that: One of the connecting pipes (12) has a through hole on its outer side and is fixedly connected to an air extraction pipe (13). The end of the air extraction pipe (13) away from the connecting pipe (12) is connected to a vacuum pump (14).

7. A template system for eliminating air bubbles on the surface of fair-faced concrete for tunnel segments according to claim 1, characterized in that: The exhaust port (9) is provided with a suction head (18), and the multiple suction heads (18) are respectively connected to the first exhaust pipe (10) and the second exhaust pipe (11).

8. A template system for eliminating air bubbles on the surface of fair-faced concrete for tunnel segments according to claim 1, characterized in that: Multiple fixed brackets (15) are evenly arrayed on the inner side of the support frame (2). A vibrator (16) is fixedly connected to the top of the fixed bracket (15). A vibrating block (17) is fixedly connected to the output shaft of the vibrator (16). The vibrating block (17) is in contact with the mold body (1).

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