In-cavity concrete cleaning mechanical device for shear-resistant reinforcement of hollow slab girder

Abstract

The utility model discloses an intra-cavity concrete cleaning device for shear-resistant reinforcement of hollow slab girders, which relates to the technical field of bridge reinforcement and comprises support cloth and two parallel support arms, the two support arms are respectively arranged on two sides of the support cloth, and two ends of the two support arms are connected with folding arms through 90-degree positioning hinges; the folding arms are in a two-section type, the middle of each folding arm is connected through a 180-degree hinge, the folding arms and the support arms are further connected through fixing springs, transverse rigid connection of the support arms after the support arms are unfolded in a cavity is achieved, and supporting positioning blocks are installed on the support arms and used for guaranteeing that the folding arms on the two sides can be unfolded at the same time, and the phenomenon that the folding arms deflect is avoided. The device is convenient to disassemble and assemble, high in flexibility and low in cost, meanwhile, the labor intensity of workers and the overall time cost of a project are reduced, the working efficiency of cleaning concrete in a cavity is improved, and the construction period is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge reinforcement in bridge engineering, in particular to a mechanical device for cleaning cavity concrete used for shear reinforcement of hollow slab beams. Background Art

[0002] Hollow slab girder bridges offer a simple structure and convenient construction, with advantages such as low building height and the ability to be constructed as inclined and curved bridges. They can be designed in a standardized manner and constructed in a factory-based, mechanized manner. They are widely used in small and medium-span bridges on my country's highways, particularly expressways. In recent years, due to low design load standards, environmental and structural degradation, and the increasing volume of traffic and the prevalence of overloaded vehicles, hollow slab girder bridges have frequently experienced insufficient shear bearing capacity. This is manifested in the development of numerous diagonal cracks in the webs, as well as L-shaped or U-shaped cracks that penetrate the base slab, primarily near the beam end supports. This is particularly true for pre-tensioned hollow slab girder bridges, which pose a risk of brittle failure and seriously endanger the operational safety of the bridges.

[0003] Traditional structural shear reinforcement methods primarily include increasing cross-sections, attaching steel plates, attaching fiber-reinforced composite materials, and external prestressing. However, these methods all have limitations and are difficult to effectively address the insufficient shear resistance of hollow slab beams. Cavity grouting has proven to be an effective solution in practical engineering. In existing technologies, high-performance, slightly expansive, self-compacting concrete is poured into the cavity and reinforced with shear reinforcement near existing bridge supports. This shear reinforcement and construction method effectively compensates for the loss of stiffness and load-bearing capacity caused by web cracking, improving the integrity and long-term durability of the reinforced area and the existing structure. This provides a reliable shear reinforcement and repair construction method and technical means for slab girder bridges and similar bridge structures. However, before using this method to reinforce the hollow slab beam, a certain size opening must be made in the upper portion of the cavity of the unused slab beam to facilitate the planting of reinforcement and the pouring of concrete. Currently, this process mainly uses a high-pressure water jet concrete milling machine to open holes in the top plate in conjunction with manual chiseling operations. After the holes are opened, the scattered concrete in the cavity needs to be cleaned. The entire concrete chiseling process does not damage the original reinforcement structure. At present, the process of cleaning the concrete fragments in the cavity mainly relies on manual cleaning. The main method is that the staff uses tools such as shovels or spoons to pick up the concrete fragments from the position after the hole is opened, and use a water gun to clean the remaining small fragments and dust at the bottom of the cavity. The entire cleaning process is inefficient, time-consuming, and has high labor costs. At the same time, manual work cannot ensure that the concrete fragments in the cavity are completely cleaned. For this reason, we propose a cavity concrete cleaning device for shear reinforcement of hollow slab beams. Utility Model Content

[0004] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract and title of the utility model to avoid obscuring the purpose of this section, the abstract and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0005] In view of the above-mentioned problems existing in the existing cavity concrete cleaning mechanical device for shear reinforcement of hollow slab beams, the present utility model is proposed.

[0006] Therefore, the purpose of this utility model is to provide a cavity concrete cleaning mechanical device for shear reinforcement of hollow slab beams, which reduces manual operation procedures, improves construction efficiency, and effectively reduces the impact of human factors on project quality in the entire reinforcement project.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a mechanical device for cleaning cavity concrete for shear reinforcement of hollow slab beams, comprising two parallel support arms and a support cloth, wherein the two support arms are respectively arranged on both sides of the support cloth, the support cloth is connected to the support arms in a sleeve-type manner, the two ends of the two support arms are connected to the folding arms through 90-degree positioning hinges, a fixed lock nut is welded on the support arm, and the fixed lock nut and the 90-degree positioning hinge are assembled through a first hinge point;

[0008] The folding arm is a two-section type, connected by a 180-degree hinge in the middle. The folding arm and the support arm are also connected by a fixed spring to achieve lateral connection after the support arm is unfolded in the cavity. A support positioning block is installed on the support arm to ensure that the folding arms on both sides can be unfolded at the same time to avoid the deflection of the folding arm, and at the same time it can also play a role in limiting the displacement of the support cloth.

[0009] As a preferred solution of the cavity concrete cleaning mechanical device for shear reinforcement of hollow slab beams described in the utility model, the supporting cloth is woven with carbon fiber material, including but not limited to carbon fiber, PVA fiber, alkali-resistant glass fiber, basalt fiber, aramid fiber or a mixture of several fibers, with a thickness of 0.35mm to 0.65mm.

[0010] As an optimal solution of the intracavity concrete cleaning mechanical device for shear reinforcement of hollow slab beams described in the utility model, the support arm, folding arm and support positioning block are all circular tubular structures, the outer tube diameters of the support arm, folding arm and support positioning block are 35mm~40mm, the rod length of the support arm is 220cm~500cm, the rod length of the folding arm is 25cm~27cm, and the length of the support positioning block is 20mm~30mm.

[0011] As a preferred solution of the cavity concrete cleaning mechanical device for shear reinforcement of hollow slab beams described in the utility model, the 90-degree positioning hinge is connected to the support arm and the folding arm by bolts, and the folding arm rotates synchronously with the 90-degree positioning hinge.

[0012] As a preferred solution of the intracavity concrete cleaning mechanical device for shear reinforcement of hollow slab beams described in the utility model, the 180-degree hinge and the folding arm are connected by welding or bolts, and the connection method of the fixed spring and the bracket arm and the folding arm can be achieved by drilling or pre-welding hooks.

[0013] As a preferred solution of the intracavity concrete cleaning mechanical device for shear reinforcement of hollow slab beams described in the present invention, wherein: the first hinge point includes an inner rod and a sleeve, the cross-sections of the inner rod and the sleeve are both circular structures, the inner rod is welded to the fixed lock nut, and the sleeve is sleeved on the inner rod. The central axes of the inner rod and the sleeve coincide with each other, and the sleeve is connected to the 90-degree positioning hinge to realize the rotation function of the 90-degree positioning hinge. The sleeves are distributed at the upper and lower parts of the inner rod and are welded to the 90-degree positioning hinges respectively. The function of the 180-degree hinge is realized by a cylindrical pin, which is inserted into the circular holes opened in the two folding arms to control the mutual rotation of the folding arms.

[0014] As a preferred solution of the cavity concrete cleaning mechanical device for shear reinforcement of hollow slab beams described in the utility model, after the entire device is unfolded, the high-strength fiber support cloth is tightly attached to the cavity wall of the hollow slab beam to prevent damage to the high-strength fiber support cloth caused by falling concrete. The two support arms are located in the same horizontal plane and tightly attached to the cavity wall of the hollow slab beam, and the vertical distance from the lowest point of the cavity is 18 cm to 20 cm.

[0015] Beneficial effects of the utility model:

[0016] The folding arms and positioning hinges of this utility model simplify the operation method while ensuring that the device can be opened and closed smoothly within the cavity. The high-strength fiber support cloth designed in conjunction with the annular shrinkage belt can quickly pack and clear the removed concrete from the hollow slab beam cavity, reducing the labor intensity of workers and the time cost of the hollow slab beam shear reinforcement project, improving the efficiency of cavity concrete cleaning and shortening the construction period.

[0017] The designed fixed spring, 90-degree positioning hinge, fixed lock nut, folding arm, first hinge point and 180-degree hinge form a deformation mechanism to realize the expansion and folding of the entire device. The device is small in size when folded and can be easily placed in the hollow slab beam cavity. When entering the hollow beam cavity, the entire device can realize the self-expansion function, completing the transition from folding to unfolding, which is free, flexible and easy to move.

[0018] In the past, when workers were cleaning concrete in the cavity, they would manually expand and damage the steel mesh above the cavity for convenience and speed. The utility model of the cavity cleaning device not only reduces manual operation procedures and improves construction efficiency, but also effectively reduces the impact of human factors on project quality in the entire reinforcement project. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. Among them:

[0020] Figure 1 This is a top view of the hollow slab beam cavity of the utility model;

[0021] Figure 2 This is a top view of the hollow slab beam of the utility model folded outward;

[0022] Figure 3 It is a cross-sectional view of the first hinge point of the utility model;

[0023] Figure 4 This is a cross-sectional view of the utility model unfolded in the cavity of the hollow slab beam. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0025] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0027] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing embodiments of the present invention, cross-sectional views of device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0028] Reference Figure 1 -4, provides a cavity concrete cleaning mechanical device for shear reinforcement of hollow slab beams, comprising two parallel support arms 1 and a support cloth 5, the two support arms 1 being arranged on either side of the support cloth 5, the support cloth 5 being connected to the support arms 1 by a sleeve connection, the two ends of the two support arms 1 being connected to the folding arms 4 by 90-degree positioning hinges 3, a fixed lock nut 2 being welded to the support arm 1, and the fixed lock nut 2 and the 90-degree positioning hinge 3 being assembled through a first hinge point 7;

[0029] Among them, the folding arm 4 is a two-section type, connected by a 180-degree hinge 8 in the middle, and the folding arm 4 and the support arm 1 are also connected by a fixed spring 9 to achieve lateral connection after the support arm 1 is unfolded in the cavity. A support positioning block 6 is installed on the support arm 1 to ensure that the folding arms 4 on both sides can be unfolded at the same time to avoid the deflection of the folding arm 4, and at the same time it can also play a role in limiting the displacement of the support cloth 5.

[0030] Furthermore, the support cloth 5 is woven with carbon fiber material, including but not limited to carbon fiber, PVA fiber, alkali-resistant glass fiber, basalt fiber, aramid fiber or a mixture of several fibers, with a thickness of 0.35mm~0.65mm; the support arm 1, folding arm 4 and support positioning block 6 are all circular tubular structures, the outer tube diameter of the support arm 1, folding arm 4 and support positioning block 6 is 35mm~40mm, the rod length of the support arm 1 is 220cm~500cm, the rod length of the folding arm 4 is 25cm~27cm, and the length of the support positioning block 6 is 20mm~30mm.

[0031] Among them, the 90-degree positioning hinge 3 is connected to the bracket arm 1 and the folding arm 4 by bolts, and the folding arm 4 rotates synchronously with the 90-degree positioning hinge 3; the 180-degree hinge 8 is connected to the folding arm 4 by welding or bolts, and the connection method of the fixing spring 9 to the bracket arm 1 and the folding arm 4 can be achieved by drilling or pre-welding hooks.

[0032] Furthermore, the first hinge point 7 includes an inner rod 10 and a sleeve 11. The cross-sections of the inner rod 10 and the sleeve 11 are both circular structures. The inner rod 10 is welded to the fixed lock nut 2. The sleeve 11 is sleeved on the inner rod 10. The central axes of the inner rod 10 and the sleeve 11 coincide with each other. The sleeve 11 is connected to the 90-degree positioning hinge 3 to realize the rotation function of the 90-degree positioning hinge 3. The sleeve 11 is distributed at the upper and lower parts of the inner rod 10 and are welded to the 90-degree positioning hinge 3 respectively. The function of the 180-degree hinge 8 is realized by a cylindrical pin, which is inserted into the circular holes opened in the two folding arms 4 to control the mutual rotation of the folding arms 4.

[0033] Among them, after the entire device is unfolded, the high-strength fiber support cloth 5 is close to the cavity wall of the hollow slab beam to prevent damage to the high-strength fiber support cloth 5 caused by falling concrete. The two support arms 1 are located in the same horizontal plane and close to the cavity wall of the hollow slab beam, and the vertical distance from the lowest point of the cavity is 18cm to 20cm.

[0034] Specifically, the method for using the cavity concrete cleaning mechanical device for shear reinforcement of hollow slab beams includes the following steps:

[0035] Step 1: Before use, the entire device is folded, the fixing spring 9 is in the maximum stretched state, and the angle formed by the two folding arms 4 on one side of the device is the smallest, at 20° to 30°. The worker inserts the device into the cavity from the first pouring port on the hollow slab girder bridge deck. At the same time, the device changes from a folded state outside the cavity to an unfolded state inside the cavity;

[0036] Step 2: After reaching the predetermined position, the entire device forms a stable working surface, preparing for the surface layer of the second pouring port of the hollow slab beam and the removal of the concrete on the beam top;

[0037] Step 3: After completing the concrete removal work, manually lift the two support arms 1 to lift the concrete scattered on the high-strength fiber support cloth 5, and then clean it out of the hollow slab beam cavity.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A mechanical device for cleaning the cavity concrete of hollow slab beams for shear reinforcement, characterized in that: The invention comprises two parallel support arms (1) and a support cloth (5), wherein the two support arms (1) are respectively arranged on both sides of the support cloth (5), and the support cloth (5) is connected to the support arms (1) in a sleeve-type manner, and both ends of the two support arms (1) are connected to the folding arms (4) via 90-degree positioning hinges (3), and a fixed lock nut (2) is welded on the support arm (1), and the fixed lock nut (2) and the 90-degree positioning hinge (3) are assembled via a first hinge point (7); The folding arm (4) is a two-section type, connected in the middle by a 180-degree hinge (8). The folding arm (4) and the support arm (1) are also connected by a fixed spring (9) to achieve lateral connection after the support arm (1) is unfolded in the cavity. A support positioning block (6) is installed on the support arm (1) to ensure that the folding arms (4) on both sides can be unfolded at the same time to avoid the deflection of the folding arm (4), and at the same time, it can also play a role in limiting the displacement of the support cloth (5).

2. The mechanical device for cleaning the cavity concrete for shear reinforcement of hollow slab beams according to claim 1 is characterized in that: The support cloth (5) is woven from carbon fiber materials, including but not limited to carbon fiber, PVA fiber, alkali-resistant glass fiber, basalt fiber, aramid fiber or a mixture of several fibers, and has a thickness of 0.35 mm to 0.65 mm.

3. The mechanical device for cleaning the cavity concrete for shear reinforcement of hollow slab beams according to claim 1 is characterized in that: The support arm (1), the folding arm (4) and the support positioning block (6) are all circular tubular structures. The outer diameters of the support arm (1), the folding arm (4) and the support positioning block (6) are 35 mm to 40 mm. The rod length of the support arm (1) is 220 cm to 500 cm. The rod length of the folding arm (4) is 25 cm to 27 cm. The length of the support positioning block (6) is 20 mm to 30 mm.

4. The mechanical device for cleaning the cavity concrete for shear reinforcement of hollow slab beams according to claim 1 is characterized in that: The 90-degree positioning hinge (3) is connected to the support arm (1) and the folding arm (4) by bolts, and the folding arm (4) rotates synchronously with the 90-degree positioning hinge (3).

5. The mechanical device for cleaning the cavity concrete for shear reinforcement of hollow slab beams according to claim 1 is characterized in that: The 180-degree hinge (8) and the folding arm (4) are connected by welding or bolts, and the fixing spring (9) and the bracket arm (1) and the folding arm (4) can be connected by drilling or pre-welding hooks.

6. The mechanical device for cleaning the cavity concrete for shear reinforcement of hollow slab beams according to claim 1, characterized in that: The first hinge point (7) includes an inner rod (10) and a sleeve (11). The cross sections of the inner rod (10) and the sleeve (11) are both circular structures. The inner rod (10) is welded to the fixed lock nut (2). The sleeve (11) is sleeved on the inner rod (10). The central axes of the inner rod (10) and the sleeve (11) coincide with each other. The sleeve (11) is connected to the 90-degree positioning hinge (3) to realize the rotation function of the 90-degree positioning hinge (3). The sleeve (11) is distributed at the upper and lower parts of the inner rod (10) and is welded to the 90-degree positioning hinge (3) respectively. The function of the 180-degree hinge (8) is realized by a cylindrical pin. The cylindrical pin is inserted into the circular holes opened in the two folding arms (4) to control the mutual rotation of the folding arms (4).

7. The mechanical device for cleaning the cavity concrete for shear reinforcement of hollow slab beams according to claim 1 is characterized in that: After the entire device is unfolded, the high-strength fiber support cloth (5) is in close contact with the cavity wall of the hollow slab beam to prevent damage to the high-strength fiber support cloth (5) caused by falling concrete. The two support arms (1) are located in the same horizontal plane and in close contact with the cavity wall of the hollow slab beam, and the vertical distance from the lowest point of the cavity is 18 cm to 20 cm.

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