Underwater concrete sample sampling device and method

Abstract

The invention belongs to the technical field of underwater concrete construction, and particularly relates to an underwater concrete sample sampling device and method.The underwater concrete sample sampling device comprises a cylindrical mold, an overwater traction mechanism and a pressurization suction pump, a bottom support is arranged at the bottom of the cylindrical mold, a support is installed on the lower portion of the bottom support, and a cavity is formed in the cylindrical mold; the inner side end face of the cylindrical mold is composed of a first elastic plate, the outer side end face of the cylindrical mold is composed of a second elastic plate, a groove is formed in the first elastic plate, an air hole connected with the cavity is formed in the top face of the cylindrical mold, the pressurization suction pump is connected with the air hole through a pipeline, and a floating plate is installed on the side face of the top end of the cylindrical mold. According to the groove and the bottom support, contact stress points can be increased when the concrete test piece is lifted, and the concrete test piece is prevented from being damaged. And the first elastic plate is deformed through pressurization and suction operation, so that the stripping degree of the cylindrical mold and the concrete test piece is controlled, and demolding of the complete concrete test piece is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of underwater concrete construction technology, and particularly relates to an underwater concrete specimen sampling device and method. Background Technology

[0002] With the continuous development of underwater construction technology, the repair methods for underwater concrete structures have gradually shifted from traditional dry-land cofferdam construction to more economical and efficient underwater construction. This shift makes quality monitoring of underwater concrete pouring crucial. Underwater pouring differs significantly from land pouring, primarily in that localized cement mortar loss may occur after concrete comes into contact with water, leading to a reduction in concrete strength. Therefore, how to effectively test the compressive strength and other performance indicators of underwater concrete has become a key focus for many scholars and experts.

[0003] Currently, the main method for inspecting underwater concrete structures is coring from a surface platform. This method requires erecting a floating raft on the water surface and mounting a geological drilling rig on it to drill core samples at the target location. However, this method faces several drawbacks: First, a second operation with additional machinery is required after the concrete has completed its curing period; second, divers need to dive again to assist with positioning, increasing the complexity of the process. Furthermore, during the coring process, uneven stress can easily cause the outer surface of the specimen to fracture, leading to core sampling failures, and multiple core sampling attempts may be necessary to obtain sufficient samples. While this method is relatively suitable for large-scale projects, it is time-consuming, labor-intensive, and costly for small-scale projects with short construction periods, demonstrating its limited applicability.

[0004] This invention designs an underwater concrete specimen sampling device and method to solve the above problems. Summary of the Invention

[0005] To achieve the above objectives, the present invention employs the following technical solutions: An underwater concrete specimen sampling device and method includes a cylindrical mold, a water-based traction mechanism, and a pressurized suction pump. The cylindrical mold has a base support at its bottom, with a bracket installed below the base support. The cylindrical mold has an internal cavity. The inner end face of the cylindrical mold is formed by a first elastic plate, and the outer end face of the cylindrical mold is formed by a second elastic plate. The first elastic plate has several grooves, and the outer side of the second elastic plate is covered with a thin film. The top surface of the cylindrical mold has air holes connected to the cavity. The pressurized suction pump is connected to the air holes via a pipe. The water-based traction mechanism is connected to the top of the cylindrical mold via a traction rope. A float plate is installed on the side of the top of the cylindrical mold.

[0006] As a preferred option, the float has an arc-shaped structure, with its outer end curving upwards toward the cylindrical mold.

[0007] As a preferred option, a float is installed on the tow rope.

[0008] As a preferred option, a hook is installed at the top of the cylindrical mold, and the traction rope is connected to the hook.

[0009] As a preferred embodiment, the base is a circular structure with a through hole at the center, and the inner diameter of the base is smaller than the inner diameter of the cylindrical mold.

[0010] The method for using an underwater concrete specimen sampling device includes the following steps: A) Preparation of equipment Apply release agent to the outer side of the film, the bottom surface of the base, and the surface of the support in the cylindrical mold; B) Device placement and cylindrical mold pressurization In the area where concrete needs to be poured, the water-based traction mechanism uses a traction rope to hoist the device to the bottom of the pouring area. The cylindrical mold stands on the bottom of the pouring area with the support of the support. Then, the cylindrical mold is pressurized by a pressure suction pump, causing the first elastic plate inside the cylindrical mold to expand outward. C) Concrete pouring According to the pouring procedure, concrete is poured from bottom to top on the bottom surface of the underwater pouring area. During the concrete pouring process, some of the concrete will be filled into the inner side of the cylindrical mold through the support and bottom support in turn. D) The cylindrical mold rises as the pouring progresses. Once the concrete pouring height reaches the elevation of the floating slab, as the concrete continues to rise, it pushes the floating slab upward, which in turn lifts the cylindrical mold, ensuring that the inside of the cylindrical mold remains filled with concrete. E) Cylindrical mold pressing After the concrete pouring is completed, the cylindrical mold is located at the top of the concrete component. The top of the cylindrical mold and the floating plate are located on the upper side of the concrete component, and the part of the cylindrical mold 1 other than the top is surrounded by concrete. After a certain curing period, the cylindrical mold solidifies to form a cylindrical concrete specimen. The pressure is reduced by a pressure suction pump, causing the first elastic plate inside the cylindrical mold to shrink and recover. The surface of the first elastic plate separates from the concrete specimen, and some protrusions remain in the groove on the outside of the concrete specimen. Then the pressure suction pump pipeline is removed. F) Lifting and demolding of concrete specimens Once the required underwater curing age has been reached, locate the cylindrical mold. Use a water-based traction mechanism and towing rope to lift the cylindrical mold out of the water. Relying on the connection between the concrete specimen and the groove, the concrete specimen is pulled off the concrete structure surface by the cylindrical mold. Then, force is applied from the bottom of the cylindrical mold to demold the concrete specimen inside the mold, obtaining a complete underwater concrete specimen. G) Cutting the surface of concrete specimens After demolding, the concrete specimens are micro-processed. The protrusions on the surface of the concrete specimens used for connecting with the grooves are removed using a shovel or cutter. Then, the top and bottom surfaces of the specimens are cut flat with a cutter to form standard specimens for subsequent tests.

[0011] Compared with existing technologies, the advantages of this invention are: 1. This invention relies on the operation of pressurization and suction to deform the first elastic plate inside the cylindrical mold. The deformation of the first elastic plate controls the degree of separation between the cylindrical mold and the concrete specimen, making it easier to remove the complete concrete specimen.

[0012] 2. The first elastic plate designed in this invention has a groove. After the surface of the first elastic plate is peeled off from the concrete specimen, there are still protrusions on the outside of the concrete specimen remaining in the groove. When the cylindrical mold is lifted, the pull-out force on the concrete specimen is concentrated on the concrete protrusions in the groove. During the lifting process of the cylindrical mold, the contact force points of the concrete specimen can be increased, and damage to the outer surface of the concrete specimen can be avoided.

[0013] 3. The concrete specimen molding method of the present invention forms a concrete connection structure between the concrete specimen and the concrete component. Since the inner diameter of the base is smaller than the inner diameter of the cylindrical mold, this concrete connection structure is a weak layer with a smaller diameter. When the cylindrical mold is lifted, this weak concrete layer can be broken more easily, thereby separating the concrete specimen from the concrete component. This avoids the situation where the connection strength between the concrete specimen and the concrete component is too large, which would prevent the concrete specimen from being easily removed.

[0014] 4. The present invention uses a support to make the cylindrical mold stand stably on the bottom surface of the concrete to be poured, and during the pouring process, the concrete can flow into the cylindrical mold through the gaps in the support, which facilitates the concrete filling into the inner side of the cylindrical mold.

[0015] 5. In the process of lifting the concrete pouring surface, the floating plate can rise with the concrete surface, thereby driving the entire cylindrical mold to rise with the concrete, so that the cylindrical mold is always on the top surface of the concrete component, which facilitates the subsequent operation of removing the cylindrical mold and can prevent the cylindrical mold from tipping over during the lifting process.

[0016] 6. The outer side of the second elastic plate of the cylindrical mold of the present invention is covered with a film. During the casting process, the outer wall of the cylindrical mold is in contact with the concrete through the film. When removing the cylindrical mold, the cylindrical mold can be easily removed from the concrete component by tearing the film. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the present invention.

[0018] Figure 2This is a schematic diagram of the cylindrical mold of the present invention.

[0019] The following are the labels in the diagram: 1. Cylindrical mold; 3. Pressure suction pump; 4. Base support; 5. Bracket; 6. First elastic plate; 7. Second elastic plate; 8. Groove; 9. Air hole; 10. Traction rope; 11. Float; 12. Float; 13. Hook. Detailed Implementation

[0020] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following embodiments and drawings are used to illustrate the present invention, but are not intended to limit the scope of the invention.

[0021] An underwater concrete specimen sampling device, such as Figure 1 and Figure 2 As shown, it includes a cylindrical mold 1, a water-based traction mechanism, and a pressurized suction pump 3. The bottom of the cylindrical mold 1 is provided with a base 4, which is a ring structure with a through hole in the center. The inner diameter of the base 4 is smaller than the inner diameter of the cylindrical mold 1. A bracket 5 is installed at the bottom of the base 4. The bracket 5 is used to support the cylindrical mold 1, leaving a gap between the lower end of the cylindrical mold 1 and the placement plane. Different heights of brackets 5 can be selected according to needs. Usually, a gap of 10cm is reserved below the bracket 5.

[0022] The cylindrical mold 1 has a cavity inside. The inner end face of the cylindrical mold 1 is formed by a first elastic plate 6, and the outer end face of the cylindrical mold 1 is formed by a second elastic plate 7. The first elastic plate 6 is provided with a number of grooves 8. The outer side of the second elastic plate 7 is covered with a film. This film is a disposable film. The top surface of the cylindrical mold 1 is provided with an air hole 9 connected to the cavity. The pressurized suction pump 3 is connected to the air hole 9 through a pipe. The first elastic plate 6 inside the cylindrical mold 1 is set along the axis of the cylindrical mold 1, which enables the formed concrete specimen to be cylindrical. The second elastic plate 7 outside the cylindrical mold 1 is inclined from top to bottom along the axis of the cylindrical mold 1 towards the inside of the cylindrical mold 1, so that the outside of the cylindrical mold 1 is an inverted cone shape. The surface of the second elastic plate 7 is a smooth surface. During concrete pouring, the concrete surrounding the cylindrical mold 1 will be funnel-shaped. When removing the cylindrical mold 1 from the concrete component, the upward lifting action of the cylindrical mold 1 can reduce the contact area between the outer wall of the cylindrical mold 1 and the concrete component. Therefore, the friction between the cylindrical mold 1 and the concrete component will decrease with the lifting action, making it easier to remove the cylindrical mold 1 from the concrete component.

[0023] The elasticity of the first elastic plate 6 is greater than that of the second elastic plate 7. Under the same pressure, the first elastic plate 6 is more likely to deform than the second elastic plate 7. Therefore, under a specified pressure, the first elastic plate 6 can deform while the second elastic plate 7 does not deform.

[0024] By applying pressure and suction, the first elastic plate 6 inside the cylindrical mold 1 can be deformed. The deformation of the first elastic plate 6 controls the degree of separation between the cylindrical mold 1 and the concrete specimen, making it easier to remove the complete concrete specimen. After the first elastic plate 6 is separated from the concrete specimen, there are still protrusions on the outside of the concrete specimen remaining in the groove 8. When the cylindrical mold 1 is lifted, the pull-out force on the concrete specimen is concentrated on the concrete protrusions in the groove 8. During the lifting process of the cylindrical mold 1, the contact force point of the concrete specimen can be increased, avoiding damage to the outer surface of the concrete specimen.

[0025] According to the concrete specimen molding method, a concrete connection structure will be formed between the concrete specimen and the concrete component. Since the inner diameter of the base 4 is smaller than the inner diameter of the cylindrical mold 1, this concrete connection structure is a weaker layer with a smaller diameter. When the cylindrical mold 1 is lifted, this weak concrete layer can be broken more easily, thereby separating the concrete specimen from the concrete component. This avoids the situation where the connection strength between the concrete specimen and the concrete component is too large, which would prevent the concrete specimen from being removed smoothly. In addition, the bottom of the concrete specimen in the cylindrical mold 1 abuts against the upper end of the base 4, increasing the support force on the concrete specimen and preventing damage to the concrete specimen.

[0026] The water towing mechanism is connected to the top of the cylindrical mold 1 via a towing rope 10. A float 12 is installed on the towing rope 10. A hook 13 is installed on the top of the cylindrical mold 1. The towing rope 10 is connected to the hook 13. A float plate 11 is installed on the side of the top of the cylindrical mold 1. The float plate 11 has an arc structure, and the outer end of the float plate 11 bends and extends upward toward the cylindrical mold 1.

[0027] During the lifting process of the concrete pouring surface, the floating plate 11 can rise with the concrete surface, thereby driving the cylindrical mold 1 to rise with the concrete as a whole, so that the cylindrical mold 1 is always on the top surface of the concrete component, which facilitates the subsequent removal of the cylindrical mold 1 and can prevent the cylindrical mold 1 from tipping over during the lifting process.

[0028] The method for using an underwater concrete specimen sampling device includes the following steps: A) Preparation of equipment Apply a release agent to the outer side of the film in the cylindrical mold 1, the bottom surface of the base 4, and the surface of the support 5; B) Device positioning and pressure application to cylindrical mold 1 In the area where concrete needs to be poured, the water-based traction mechanism uses the traction rope 10 to hoist the device to the bottom of the pouring area. The cylindrical mold 1 stands on the bottom of the pouring area with the support 5. Then, the cylindrical mold 1 is pressurized by the pressure suction pump 3, causing the first elastic plate 6 on the inner side of the cylindrical mold 1 to expand outward. C) Concrete pouring According to the pouring procedure, concrete is poured from bottom to top on the bottom surface of the underwater pouring area. During the concrete pouring process, some of the concrete will be filled into the inner side of the cylindrical mold 1 through the support 5 and the bottom support 4 in sequence. D) The cylindrical mold rises as the pouring progresses. When the concrete pouring height rises to the elevation of the floating plate 11, as the concrete continues to rise, the concrete pushes the floating plate 11 to rise, and the floating plate 11 drives the cylindrical mold 1 to rise together, ensuring that the inner side of the cylindrical mold 1 remains filled with concrete. E) Cylindrical mold pressing After the concrete pouring is completed, the cylindrical mold 1 is located in the top area of ​​the concrete component. The top of the cylindrical mold 1 and the floating plate 11 are located on the upper side of the concrete component, and the part of the cylindrical mold 1 other than the top is surrounded by concrete. After a certain curing period, the cylindrical mold 1 solidifies to form a cylindrical concrete specimen. The pressure is reduced by the pressure suction pump 3, causing the first elastic plate 6 on the inner side of the cylindrical mold 1 to shrink and recover. The surface of the first elastic plate 6 is separated from the concrete specimen, and there are still protrusions on the outside of the concrete specimen in the groove 8. Then the pressure suction pump 3 pipeline is removed. F) Lifting and demolding of concrete specimens Once the required underwater curing period has been reached, locate the cylindrical mold 1. Use the water-based traction mechanism and traction rope 10 to lift the cylindrical mold 1 out of the water. Relying on the connection between the concrete specimen and the groove 8, the concrete specimen is pulled off the concrete casting structure surface by the cylindrical mold 1. Then, force is applied from the bottom surface of the cylindrical mold 1 to demold the concrete specimen inside the cylindrical mold 1, obtaining a complete underwater concrete specimen. G) Cutting the surface of concrete specimens After demolding, the concrete specimens are micro-processed. The protrusions on the surface of the concrete specimens used for connecting with the groove 8 are removed using a shovel or cutter. Then, the top and bottom surfaces of the specimens are flattened with a cutter to form standard specimens for subsequent tests.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. An underwater concrete specimen sampling device, characterized in that, The system includes a cylindrical mold (1), a water-based traction mechanism, and a pressurized suction pump (3). The bottom of the cylindrical mold (1) is provided with a base support (4), and a bracket (5) is installed on the lower part of the base support (4). The cylindrical mold (1) has a cavity inside. The inner end face of the cylindrical mold (1) is composed of a first elastic plate (6), and the outer end face of the cylindrical mold (1) is composed of a second elastic plate (7). The first elastic plate (6) is provided with several grooves (8), and the outer side of the second elastic plate (7) is covered with a thin film. The top surface of the cylindrical mold (1) is provided with an air hole (9) connected to the cavity. The pressurized suction pump (3) is connected to the air hole (9) through a pipe. The water-based traction mechanism is connected to the top of the cylindrical mold (1) through a traction rope (10). A float plate (11) is installed on the side of the top of the cylindrical mold (1).

2. The underwater concrete specimen sampling device according to claim 1, characterized in that: The float (11) has an arc-shaped structure, with the outer end of the float (11) bending and extending upward toward the cylindrical mold (1).

3. The underwater concrete specimen sampling device according to claim 1, characterized in that: A float (12) is installed on the traction rope (10).

4. The underwater concrete specimen sampling device according to claim 3, characterized in that: The top of the cylindrical mold (1) is equipped with a hook (13), and the traction rope (10) is connected to the hook (13).

5. The underwater concrete specimen sampling device according to claim 1, characterized in that: The base (4) is a circular ring structure with a through hole in the center, and the inner diameter of the base (4) is smaller than the inner diameter of the cylindrical mold (1).

6. A method for using an underwater concrete specimen sampling device, characterized in that... Construction was carried out using an underwater concrete specimen sampling device as described in any one of claims 1-5, with the following steps: A) Preparation of equipment Apply release agent to the outer side of the film of the cylindrical mold (1), the bottom surface of the base (4) and the surface of the bracket (5); B) Device placement and cylindrical mold pressurization In the area where concrete needs to be poured, the water-based traction mechanism uses a traction rope (10) to hoist the device to the bottom of the pouring area. The cylindrical mold (1) stands on the bottom of the pouring area with the support (5). Then, the cylindrical mold (1) is pressurized by the pressure suction pump (3), causing the first elastic plate (6) inside the cylindrical mold (1) to expand outward. C) Concrete pouring According to the pouring procedure, concrete is poured from bottom to top on the bottom surface of the underwater pouring area. During the concrete pouring process, some concrete will be filled into the inner side of the cylindrical mold (1) through the support (5) and the bottom support (4) in sequence. D) The cylindrical mold rises as the pouring progresses. When the concrete pouring height rises to the elevation of the floating plate (11), as the concrete continues to rise, the concrete pushes the floating plate (11) to rise, and the floating plate (11) drives the cylindrical mold (1) to rise together, ensuring that the inner side of the cylindrical mold (1) remains filled with concrete. E) Cylindrical mold pressing After the concrete pouring is completed, the cylindrical mold (1) is located in the top area of ​​the concrete component. The top of the cylindrical mold (1) and the floating plate (11) are located on the upper side of the concrete component. The part other than the top of the cylindrical mold (1) is surrounded by concrete. After a certain curing period, the cylindrical mold (1) solidifies to form a cylindrical concrete specimen. The pressure is reduced by the pressure suction pump (3) to shrink and restore the first elastic plate (6) inside the cylindrical mold (1). The surface of the first elastic plate (6) is separated from the concrete specimen. There are still protrusions on the outside of the concrete specimen in the groove (8). Then the pressure suction pump (3) pipe is removed. F) Lifting and demolding of concrete specimens Once the required underwater curing age has been reached, locate the cylindrical mold (1). Use a water-based traction mechanism and traction rope (10) to lift the cylindrical mold (1) out of the water. Relying on the connection between the concrete specimen and the groove (8), the concrete specimen is pulled off the concrete casting structure surface by the cylindrical mold (1). Then, force is applied from the bottom surface of the cylindrical mold (1) to demold the concrete specimen inside the cylindrical mold (1) and obtain a complete underwater concrete specimen. G) Cutting the surface of concrete specimens After demolding, the concrete specimens are micro-processed. The protrusions on the surface of the concrete specimens used to connect with the groove (8) are removed by using a shovel or cutter. Then, the top and bottom surfaces of the specimens are cut flat by a cutter to form standard specimens for subsequent tests.

Images