Centering device for lowering reinforcement cage in cast-in-situ bored pile foundation

Abstract

The utility model relates to the technical field of reinforcement cage centering, and discloses a centering device for lowering a reinforcement cage of a cast-in-situ bored pile foundation, which comprises a base, supporting tables are arranged on the periphery of the upper surface of the base, sliding rails are arranged on two sides of each supporting table, and limiting plates are arranged on the inner sides of the supporting tables; an opening is formed in the middle in the base, and the limiting plate extends into the opening. Through the arrangement of the supporting rods, the tension springs and the movable blocks, before the ends of the reinforcement cage are hoisted into the opening, the electromagnets can be closed, the movable blocks are not limited by the electromagnets, the tension springs drive the movable blocks and the limiting plates to move outwards, the space between the limiting plates is enlarged, and the reinforcement cage can be hoisted in the initial stage conveniently; the strong magnetic force of the electromagnet can attract the movable block, the multiple sets of limiting plates abut against the outer side of the reinforcement cage, the reinforcement cage is centered, then the reinforcement cage continues to go deep and is gradually lowered and hoisted, and compared with an existing mode, the structure is high in adjusting efficiency, and the reinforcement cage lowering and hoisting efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of steel cage centering, in particular to a steel cage centering device for lowering a bored cast-in-place pile foundation. Background Art

[0002] Bored cast-in-place piles refer to piles made by forming pile holes in the foundation soil at the construction site through mechanical drilling, steel pipe squeezing or manual excavation, and placing steel cages and pouring concrete inside. According to different hole-forming methods, cast-in-place piles can be divided into several categories, such as sinking pipe cast-in-place piles, bored cast-in-place piles and excavated cast-in-place piles. During construction, the steel cage needs to be placed vertically in the pile hole, and the steel cage should be placed to avoid hitting the inner wall of the casing, and the center line of the steel cage should be ensured to coincide with the center line of the casing.

[0003] In the process of realizing the utility model, the inventors found that the following problems existed in the prior art and have not been solved: although the existing device for centering the steel cage for lowering the bored cast-in-place pile foundation has four sets of limit baffles against the outside of the steel cage to center the steel cage and provide a guiding effect, the limit baffles are manually adjusted by twisting the threaded structure. In the early stage of using the lifting device to lift the steel cage, the swinging end of the steel cage needs to be lifted to the inside of the limit baffles, and the space between the limit baffles is close to the steel cage, which is not easy to lift in. Therefore, it is necessary to twist the threaded structure to first adjust the limit baffle outward and then adjust the baffle back. However, the adjustment efficiency of the threaded structure is not ideal, which directly affects the construction efficiency and is urgently needed to be improved. Therefore, we propose a device for centering the steel cage for lowering the bored cast-in-place pile foundation. Utility Model Content

[0004] The utility model aims to provide a device for centering a steel cage placed under a bored cast-in-place pile foundation, which solves the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for centering a steel cage for lowering a bored pile foundation, comprising a base, support platforms are placed around the upper surface of the base, slide rails are placed on both sides of the support platforms, and a limit plate is placed inside the support platforms;

[0006] An opening is provided in the middle of the base, and the limiting plate extends into the opening;

[0007] A groove is provided in the middle of the upper surface of the support platform, a movable block is placed in the groove, a support rod is fixedly installed inside the movable block, the support rod movably penetrates the side wall of the support platform, and the outer end of the support rod is fixedly connected to the limit plate;

[0008] A sleeve is fixedly installed inside the side wall of the abutment, and there are eight groups of sleeves in total. An inner rod movably penetrates through the middle of the sleeve, and the inner rod is fixedly connected to the movable block. A tension spring is sleeved outside the sleeve, and both ends of the tension spring are fixedly connected to the abutment and the movable block respectively. An electromagnet is fixedly installed on one side of the abutment away from the sleeve;

[0009] A slider is movably clamped in the slide rail. The inner side of the slider is fixedly connected to the abutment. Through the cooperation of components such as the support rod, the tension spring and the movable block, during the use of the cage lowering and centering device, before lifting the end of the steel cage to the opening, the electromagnet can be turned off, and the electromagnet cancels the limit of the movable block. The tension spring drives the movable block and the limit plate to move outwards, and the space between the limit plates becomes larger, which is convenient for the initial lifting of the steel cage. After the end of the steel cage is lifted in, the electromagnet is turned on. The strong magnetic force of the electromagnet can adsorb the movable block, and multiple limit plates abut against the outside of the steel cage to make the steel cage centered. Then continue to lower and gradually lower the steel cage. Compared with the existing method, the structure has a fast adjustment efficiency and can improve the efficiency of lowering and lifting the steel cage.

[0010] As an alternative solution of the technical solution of the present application, four groups of screw rods movably penetrate through the side walls of the slide rails, and the inner ends of the screw rods are rotatably connected to the slide rails through bearings. The middle of the screw rod is screwed with a screw hole preset in the slider through external threads. A rotating block is fixedly installed at the outer end of the screw rod. Through the cooperation of components such as the screw rod and the bearing, since the inner movement distance of the limit plate is certain, the screw rod can be rotated forward and backward, and the screw rod can drive the slider to move in the slide rail, and the abutment can be driven to move. The maximum inward movement position of the limit plate can be adjusted according to the size of different steel cages, with a wide range of applications and strong versatility.

[0011] As an alternative solution of the technical solution of the present application, a storage battery and a signboard are fixedly installed on the upper surface of the base near the slide rail, and the storage battery is electrically connected to the electromagnet through a wire. The electric energy can be provided by the storage battery, so as to avoid pulling the wire, meet the power supply requirements for outdoor use, and at the same time, the signboard can inform the operator of the usage method.

[0012] As an alternative solution of the technical solution of the present application, guide rods are fixedly installed on both sides of the limit plate, and the guide rods movably penetrate through guide holes preset in the base. Through the cooperation of the guide rods and the guide holes, the guide and limit of the limit plate can be realized, thereby avoiding the situation of inclination deformation or even fracture.

[0013] As an alternative solution of the technical solution of the present application, positioning holes are opened outside the base near the opening, and there are four groups of positioning holes in total. The fixing tool positioning cones can be penetrated through the multiple positioning holes, and the positioning cones are inserted into the soil, so as to realize the stable limit of the device.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. A centering device for lowering a steel reinforcement cage in a bored cast-in-place pile foundation of the present utility model is provided with a support rod, a tension spring and a movable block. During the use of the centering device for lowering the steel reinforcement cage, before the end of the steel reinforcement cage is hoisted into the opening, the electromagnet can be turned off, and the electromagnet cancels the limit of the movable block. The tension spring drives the movable block and the limit plate to move outwards, and the space between the limit plates becomes larger, which is convenient for the initial hoisting of the steel reinforcement cage. After the end of the steel reinforcement cage is hoisted in, the electromagnet is turned on, and the strong magnetic force of the electromagnet can adsorb the movable block. Multiple limit plates abut against the outside of the steel reinforcement cage to make the steel reinforcement cage centered. Then, the steel reinforcement cage is continuously lowered and hoisted in step by step. Compared with the existing method, the structure has a fast adjustment efficiency and can improve the hoisting efficiency of the steel reinforcement cage.

[0016] 2. A centering device for lowering a steel reinforcement cage in a bored cast-in-place pile foundation of the present utility model is provided with a screw rod and a bearing. Since the inward movement distance of the limit plate is certain, the screw rod can be rotated forward and backward, and the screw rod can drive the slider to move in the slide rail, and can drive the support platform to move. According to the sizes of different steel reinforcement cages, the maximum inward movement position of the limit plate can be adjusted, with a wide application range and strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Other features, objects and advantages of the present utility model will become more apparent by reading the detailed description of the non-restrictive embodiments with reference to the following drawings:

[0018] Figure 1 It is a schematic top view structure diagram of a centering device for lowering a steel reinforcement cage in a bored cast-in-place pile foundation of the present utility model;

[0019] Figure 2 It is a schematic structure diagram of the connection part between the support platform and the slide rail of a centering device for lowering a steel reinforcement cage in a bored cast-in-place pile foundation of the present utility model;

[0020] Figure 3 It is a schematic structure diagram of the connection part between the slide rail and the slider of a centering device for lowering a steel reinforcement cage in a bored cast-in-place pile foundation of the present utility model.

[0021] In the figure: 1, base; 11, indicator board; 12, positioning hole; 13, storage battery; 14, opening; 2, slide rail; 21, slider; 22, screw rod; 23, bearing; 24, rotating block; 3, limit plate; 31, support rod; 32, movable block; 4, guide rod; 5, support platform; 51, groove; 52, sleeve; 53, tension spring; 54, inner rod; 55, electromagnet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Please refer to Figures 1-3, the present utility model provides a technical solution: a centering device for lowering a steel reinforcement cage in a bored cast-in-place pile foundation, including a base 1. Support platforms 5 are placed around the upper surface of the base 1. Slide rails 2 are placed on both sides of the support platform 5, and limit plates 3 are placed inside the support platform 5; an opening 14 is formed in the middle of the base 1, and the limit plate 3 extends into the opening 14. Positioning holes 12 are formed outside the base 1 near the opening 14, and there are four groups of positioning holes 12 in total. A fixing tool positioning cone can be passed through multiple groups of positioning holes 12 and inserted into the soil, so as to realize the stable limit of the device; a groove 51 is formed in the middle of the upper surface of the support platform 5, and a movable block 32 is placed in the groove 51. A support rod 31 is fixedly installed inside the movable block 32. The support rod 31 movably penetrates the side wall of the support platform 5, and the outer end of the support rod 31 is fixedly connected to the limit plate 3. Guide rods 4 are fixedly installed on both sides of the limit plate 3, and the guide rods 4 movably penetrate through the preset guide holes in the base 1. The cooperation between the guide rod 4 and the guide hole can be used for the guiding limit of the limit plate 3, thereby avoiding the occurrence of inclination deformation or even fracture; a sleeve 52 is fixedly installed inside the side wall of the support platform 5, and there are eight groups of sleeves 52 in total. An inner rod 54 movably penetrates through the middle of the sleeve 52, and the inner rod 54 is fixedly connected to the movable block 32. A tension spring 53 is sleeved outside the sleeve 52, and both ends of the tension spring 53 are fixedly connected to the support platform 5 and the movable block 32 respectively. An electromagnet 55 is fixedly installed on one side of the support platform 5 away from the sleeve 52; a slider 21 is movably clamped in the slide rail 2, and the inner side of the slider 21 is fixedly connected to the support platform 5. A storage battery 13 and a sign 11 are fixedly installed on one side of the upper surface of the base 1 near the slide rail 2, and the storage battery 13 is electrically connected to the electromagnet 55 through a wire. Electric energy can be provided by the storage battery 13, thus avoiding pulling the wire and meeting the power supply requirements for outdoor use. At the same time, the operator can be informed of the usage method through the sign 11.

[0024] In this technical solution, components such as the support rod 31, the tension spring 53 and the movable block 32 can be used in cooperation. During the use of the centering device for lowering the steel reinforcement cage, before the end of the steel reinforcement cage is hoisted into the opening 14, the electromagnet 55 can be turned off, and the electromagnet 55 cancels the limit of the movable block 32. The tension spring 53 drives the movable block 32 and the limit plate 3 to move outward, and the space between the limit plates 3 becomes larger, which is convenient for the initial hoisting of the steel reinforcement cage. After the end of the steel reinforcement cage is hoisted in, the electromagnet 55 is turned on. The strong magnetic force of the electromagnet 55 can adsorb the movable block 32, and multiple groups of limit plates 3 abut against the outside of the steel reinforcement cage to make the steel reinforcement cage centered. Then, the steel reinforcement cage is continuously lowered and hoisted deeper. Compared with the existing method, the adjustment efficiency of this structure is fast, and the hoisting and lowering efficiency of the steel reinforcement cage can be improved.

[0025] In some technical solutions, a screw rod 22 movably penetrates through the side walls of the four groups of slide rails 2, and the inner end of the screw rod 22 is rotatably connected to the slide rail 2 through a bearing 23. The middle of the screw rod 22 is screwed into a screw hole preset in the slider 21 through an external thread, and a rotating block 24 is fixedly installed at the outer end of the screw rod 22.

[0026] In this technical solution, components such as the screw rod 22 and the bearing 23 can be used in cooperation. Since the inward movement distance of the limit plate 3 is fixed, the screw rod 22 can be rotated forward and backward. The screw rod 22 can drive the slider 21 to move in the slide rail 2, and can drive the support platform 5 to move. The maximum inward movement position of the limit plate 3 can be adjusted according to the sizes of different steel reinforcement cages, with a wide application range and strong versatility.

[0027] Working principle: It should be noted that the present utility model is a device for centering the steel reinforcement cage during the placement of a bored cast-in-place pile foundation. The components are all common standard parts or parts known to those skilled in the art, and their structures and principles can all be learned by those skilled in the art through technical manuals or through conventional test methods.

[0028] When using a device for centering the steel reinforcement cage during the placement of a bored cast-in-place pile foundation, carry the steel reinforcement cage centering device to the extrusion and placement station of the bored cast-in-place pile. Then, place the device in the center on the upper side of the borehole, and pass through the positioning cone through the positioning hole 12 to fix the device on the upper side of the borehole. The device can provide a centering assistance effect for the placement of the steel reinforcement cage.

[0029] By providing the support rod 31, the tension spring 53 and the movable block 32, during the use of the steel reinforcement cage centering device, before the end of the steel reinforcement cage is hoisted into the opening 14, the electromagnet 55 can be turned off. The electromagnet 55 cancels the limit of the movable block 32, and the tension spring 53 drives the movable block 32 and the limit plate 3 to move outward. The space between the limit plates 3 becomes larger, facilitating the initial hoisting of the steel reinforcement cage. After the end of the steel reinforcement cage is hoisted in, the electromagnet 55 is turned on. The strong magnetic force of the electromagnet 55 can adsorb the movable block 32, and multiple limit plates 3 abut against the outer side of the steel reinforcement cage to center the steel reinforcement cage. Then, continue to lower and gradually hoist the steel reinforcement cage deeper. Compared with the existing method, the adjustment efficiency of this structure is fast, which can improve the hoisting efficiency of the steel reinforcement cage during placement. By providing the screw rod 22 and the bearing 23, since the inward movement distance of the limit plate 3 is fixed, the screw rod 22 can be rotated forward and backward. The screw rod 22 can drive the slider 21 to move in the slide rail 2, and can drive the support platform 5 to move. The maximum inward movement position of the limit plate 3 can be adjusted according to the sizes of different steel reinforcement cages, with a wide application range and strong versatility.

Claims

1. A device for centering a steel cage for a bored pile foundation, characterized in that: It comprises a base (1), wherein support platforms (5) are placed around the upper surface of the base (1), slide rails (2) are placed on both sides of the support platforms (5), and a limiting plate (3) is placed inside the support platforms (5); An opening (14) is provided in the middle of the base (1), and the limiting plate (3) extends into the opening (14); A groove (51) is provided in the middle of the upper surface of the support platform (5), a movable block (32) is placed in the groove (51), a support rod (31) is fixedly installed inside the movable block (32), the support rod (31) movably penetrates the side wall of the support platform (5), and the outer end of the support rod (31) is fixedly connected to the limit plate (3); A sleeve (52) is fixedly installed in the side wall of the support platform (5), and there are eight groups of sleeves (52). An inner rod (54) is movably penetrated in the middle of the sleeve (52), and the inner rod (54) is fixedly connected to the movable block (32). A tension spring (53) is sleeved on the outer side of the sleeve (52), and the two ends of the tension spring (53) are respectively fixedly connected to the support platform (5) and the movable block (32). An electromagnet (55) is fixedly installed on the side of the support platform (5) away from the sleeve (52); A sliding block (21) is movably positioned in the slide rail (2), and the inner side of the sliding block (21) is fixedly connected to the support platform (5).

2. A device for centering a steel cage for lowering a bored pile foundation according to claim 1, characterized in that: The side walls of the four groups of slide rails (2) are movably penetrated by screw rods (22), and the inner ends of the screw rods (22) are rotatably connected to the slide rails (2) via bearings (23). The middle part of the screw rods (22) is screwed to a preset screw hole in the slider (21) via an external thread, and a rotating block (24) is fixedly installed on the outer end of the screw rods (22).

3. The device for centering a steel cage for lowering a bored pile foundation according to claim 1, characterized in that: A storage battery (13) and an indicator sign (11) are fixedly mounted on one side of the upper surface of the base (1) close to the slide rail (2), and the storage battery (13) is electrically connected to the electromagnet (55) via a wire.

4. A device for centering a steel cage for lowering a bored pile foundation according to claim 3, characterized in that: Guide rods (4) are fixedly mounted on both sides of the limit plate (3), and the guide rods (4) are movably inserted into guide holes preset in the base (1).

5. The device for centering a steel cage for lowering a bored pile foundation according to claim 1, characterized in that: Positioning holes (12) are provided on the outside of the base (1) close to the opening (14), and there are four groups of positioning holes (12) in total.

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