Large-diameter bored pile reinforcement cage lowering and positioning method

Abstract

The invention discloses a large-diameter bored pile reinforcement cage lowering and positioning method which comprises the steps that S1, a drilled hole is constructed, and a steel casing is installed in the drilled hole; a positioning base is placed on the outer side of the steel casing in the circumferential direction, the top face of the positioning base is flush with the top face of the steel casing, and the positioning base and the steel casing are concentrically arranged; s2, a lifting appliance is installed on the crane, and other sections of reinforcement cages except the last section of reinforcement cage are sequentially lifted through the lifting appliance; s3, a positioning tool is installed on the lifting appliance, and the last section of reinforcement cage is lifted through the positioning tool; and S4, all the reinforcement cages are lowered into the drilled hole, the positioning shaft of the positioning tool is placed in the positioning groove of the positioning base, concrete is poured into the drilled hole, and the drilled pile is formed. The device has the advantages that the device is simple to operate and can be repeatedly used; the positioning shaft of the positioning tool is placed in the positioning groove of the positioning base, so that the reinforcement cage is quickly positioned.

Description

Technical Field

[0001] The invention relates to the technical field of lowering and positioning a reinforcement cage, in particular to a method for lowering and positioning a reinforcement cage of a large-diameter bored pile. Background Art

[0002] In large-scale projects such as bridges, high-rise buildings, and port terminals, large-diameter bored piles are the core foundation structures that bear critical loads. The positioning accuracy of their steel cages directly affects the load-bearing performance and durability of the pile foundation. Currently, the positioning of steel cages mainly relies on manual operations, which are specifically manifested as follows: 1. Primitive positioning methods: Construction workers need to observe the relative position of the center of the steel cage and casing with the naked eye, supplemented by a tape measure or measuring rope to perform local dimensional measurements. This method is greatly affected by light, viewing angle, and human experience. Especially when working in deep holes, muddy mud, or at night, the error is further amplified, causing the center of the steel cage to deviate, tilt, or twist; 2. Conflict between efficiency and precision: The steel cages of large-diameter piles (e.g., diameter ≥ 2m) are heavy and have low rigidity, making them prone to swinging during lowering. To reduce deviation, multiple pauses and adjustments are often required, taking up to several hours. Current regulations require vertical deviation of the steel cage to be ≤1% and horizontal deviation to be ≤50mm. Traditional methods make it difficult to achieve both efficiency and precision. 3. Lack of real-time feedback: Existing methods cannot dynamically monitor the three-dimensional posture (such as center coordinates, verticality, and torsion angle) of the steel cage during its sinking process. Quality can only be verified through spot checks after the final hole is drilled. If deviation is found, rework is required, resulting in material waste and construction delays. 4. Poor adaptability to special working conditions: In complex geological conditions (such as quicksand layers, karst development areas) or underwater construction, the steel cage is more likely to become unstable due to the influence of water flow, buoyancy or hole wall friction, and manual positioning lacks effective correction and control means. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for lowering and positioning the reinforcement cage of a large-diameter bored pile based on the deficiencies of the above-mentioned prior art. The positioning method places a positioning base on the circumferential outer side of the steel casing, and keeps the positioning base and the steel casing concentrically arranged; a sling is installed on the crane, and the other sections of the reinforcement cage except the last section are hoisted in sequence by the sling; a positioning tool is installed on the sling, and the last section of the reinforcement cage is hoisted by the positioning tool; all the reinforcement cages are lowered into the drill hole, and the positioning shaft of the positioning tool is placed in the positioning groove of the positioning base, thereby realizing rapid positioning of the reinforcement cage.

[0004] The purpose of the present invention is achieved by the following technical solutions: A method for positioning a large-diameter bored pile reinforcement cage, the positioning method comprising: S1: Drill a construction hole and install a steel casing in the hole; Place a positioning base on the circumferential outer side of the steel casing, and make the top surface of the positioning base flush with the top surface of the steel casing and keep the positioning base and the steel casing concentric; Among them, the positioning base includes a positioning box, a positioning groove and a base positioning plate. The positioning box is annular. The positioning groove is arranged along the circumferential direction of the top of the positioning box. There are multiple base positioning plates arranged along the circumferential direction of the positioning box. The base positioning plates penetrate through the positioning box and move along the radial direction of the positioning box. A scale is provided on the base positioning plate; S2: Install a lifting tool on the crane and hoist other sections of the steel cage except the last section through the lifting tool in sequence; S3: Install a positioning tooling on the lifting tool and hoist the last section of the steel cage through the positioning tooling; Among them, the positioning tooling includes two double-channel main rods, two double-channel secondary rods and positioning shafts. There are two relatively arranged double-channel main rods. There are two relatively arranged double-channel secondary rods. The two ends of the double-channel secondary rods are respectively connected to the middle parts of the two double-channel main rods. There are four positioning shafts. The four positioning shafts are respectively arranged at the two ends of the two double-channel main rods. The size, shape and position of the positioning shafts respectively correspond to the size, shape and position of the positioning grooves of the positioning base; S4: Lower all the steel cages into the hole and place the positioning shafts of the positioning tooling in the positioning grooves of the positioning base. Pour concrete into the hole to form a drilled pile.

[0005] In step S1, the method for keeping the positioning base and the steel casing concentric is: Adjust the base positioning plate to make it tightly press against the steel casing and make the scales exposed on each base positioning plate consistent, and then fix the base positioning plate.

[0006] The lifting tool includes a double-channel cross, connecting rods, upper lifting ears and lower lifting ears. The double-channel cross is composed of four double-channel bars and connecting plates. Each two adjacent ends among the four ends of the double-channel cross are connected by the connecting rods. The upper lifting ears and the lower lifting ears are respectively arranged on the upper and lower parts of the connection between the double-channel cross and the connecting rods.

[0007] A positioning plate hand hole is provided on the base positioning plate.

[0008] The base positioning plate is fixed by a locking plate and bolts.

[0009] The cross-section of the positioning box is U-shaped, and the inside of the positioning box is strengthened by base stiffening plates.

[0010] The connection between the double-channel steel main rod and the double-channel steel secondary rod is provided with a lifting lug and a steel cage connection hole.

[0011] The double-channel steel main rod and the double-channel steel secondary rod are connected by a single-channel steel connection system.

[0012] The advantages of the present invention are: simple operation and reusability; and rapid positioning of the steel cage is achieved by placing the positioning shaft of the positioning tool in the positioning groove of the positioning base. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the installation of the positioning base of the present invention; Figure 2 for Figure 1 Cross-section of the middle AA; Figure 3 for Figure 2 A partial enlarged view of Figure 4 for Figure 1 Cross-section of the middle BB; Figure 5 for Figure 1 Cross-section of the middle CC; Figure 6 A schematic diagram of the positioning tool of the present invention; Figure 7 for Figure 6 Cross-section of the middle DD; Figure 8 for Figure 6 Cross-section of the middle EE; Figure 9 for Figure 6 Cross-section of the middle FF; Figure 10 is a schematic diagram of the spreader of the present invention; Figure 11 for Figure 10 Cross-section of the middle GG; Figure 12 Schematic diagram of the construction of step S1 of the method for lowering and positioning the reinforcement cage of a large-diameter bored pile according to the present invention; Figure 13 Schematic diagram of the construction of step S2 of the method for lowering and positioning the reinforcement cage of a large-diameter bored pile according to the present invention; Figure 14 for Figure 13 A partial enlarged view of Figure 15 Schematic diagram of the construction of step S3 of the method for lowering and positioning the reinforcement cage of a large-diameter bored pile according to the present invention; Figure 16 for Figure 15 A partial enlarged view of Figure 17 Schematic diagram of the construction of step S4 of the method for lowering and positioning the reinforcement cage of a large-diameter bored pile according to the present invention; Figure 18 for Figure 17 A partial enlarged view of like Figures 1 to 18 As shown, the marks in the figure represent: Positioning base 10, positioning box 101, positioning slot 102, base positioning plate 103, scale 1031, positioning wrench hand hole 1032, base stiffening plate 104, locking plate 105, positioning tool 20, double-channel steel main rod 201, double-channel steel secondary rod 202, positioning shaft 203, lifting ear 204, steel cage connecting hole 205, single-channel steel connecting system 206, sling 30, double-channel steel cross 301, double-channel steel rod 3011, connecting plate 3012, connecting rod 302, upper lifting ear 303, lower lifting ear 304, drill hole 40, pad 50, steel casing 60, crane 70, steel cage 80, lifting rod 90, wire rope 100. DETAILED DESCRIPTION

[0014] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: Example: Figures 1 to 18 As shown, this embodiment relates to a method for positioning a large-diameter bored pile reinforcement cage, which mainly includes the following steps: S1: If Figure 12 As shown, a borehole 40 is constructed, sediment is cleaned, and a steel casing 60 is installed in the borehole 40. A positioning base 10 is placed on the circumferential outside of the steel casing 60, and the top surface of the positioning base 10 is flush with the top surface of the steel casing 60 and the positioning base 10 and the steel casing 60 are kept concentric.

[0015] Among them, Figures 1 to 5As shown in the figure, the positioning base 10 includes a positioning box 101, a positioning groove 102 and a base positioning plate 103. The positioning box 101 is annular, and the cross-section of the positioning box 101 is in a C shape (open on the outside). The positioning box 101 is composed of an upper ring plate, a lower ring plate and an inner plate. The inside of the positioning box 101 is strengthened by base stiffening plates 104. Specifically, a number of base stiffening plates 104 are provided along the inner circumference of the positioning box 101. The base stiffening plates 104 are composed of radial stiffening plates and circumferential stiffening plates. The positioning groove 102 (annular) is arranged circumferentially along the top (upper ring plate) of the positioning box 101. Four base positioning plates 103 are arranged circumferentially along the positioning box 101. The base positioning plates 103 penetrate through the positioning box 101 and move along the radial direction of the positioning box 101. Specifically, four outer plates (corresponding to the number of the base positioning plates 103) are provided along the outer circumference of the positioning box 101. Through holes are provided on both the outer plates and the inner plates. The sizes and shapes of the through holes respectively correspond to the sizes and shapes of the base positioning plates 103. A scale 1031 is provided on the base positioning plate 103 for determining the position of the base positioning plate 103 in the positioning box 101. A positioning plate hand hole 1032 is provided on the base positioning plate 103 to facilitate the construction personnel to move the base positioning plate 103. The base positioning plate 103 is fixed by a locking plate 105 and bolts. Four locking plates 105 are provided. The four locking plates 105 are respectively closely attached to the outer side (outer plate) and the inner side (inner plate) of the positioning base 10 in pairs. The locking plate 105 is connected to the base positioning plate 103 by bolts. The locking plate 105 can limit the position of the base positioning plate 103 and prevent the base positioning plate 103 from moving. [[ID=I]]

[0016] In this embodiment, the height of the positioning base 10 is adjusted by the shimming pad 50. The base positioning plate 103 is adjusted to make it press tightly against the steel casing 60 and make the exposed scales 1031 of each base positioning plate 103 consistent. The base positioning plate 103 is fixed by the locking plate 105 and bolts, so as to keep the positioning base 10 and the steel casing 60 concentrically arranged.

[0017] S2: As Figures 13 and 14 shown in the figure, a lifting tool 30 is installed on the crane 70, and the other steel reinforcement cages 80 except the last one are hoisted in sequence by the lifting tool 30.

[0018] Among them, as Figures 10-11As shown, the sling 30 includes a double-channel steel cross 301, a connecting rod 302, an upper lifting ear 303 and a lower lifting ear 304. The double-channel steel cross 301 is composed of four double-channel steel rods 3011 and a connecting plate 3012. Every two adjacent ends of the four ends of the double-channel steel cross 301 are connected by a connecting rod 302. The upper lifting ear 303 and the lower lifting ear 304 are respectively arranged at the upper and lower parts of the connection between the double-channel steel cross 301 and the connecting rod 302. The upper lifting ear 303 is connected to the hook of the crane 70, and the lower lifting ear 304 is connected to the lifting rod 90 or is connected to the lifting ear 204 of the positioning tool 20 through the wire rope 100.

[0019] In this embodiment, the upper lifting lug 303 of the sling 30 is connected to the hook of the crane 70 , and the lower lifting lug 304 of the sling 30 is connected to the other steel cages 80 except the last section of the steel cage 80 through the hanging rod 90 .

[0020] S3: If Figures 15 and 16 As shown, the positioning tool 20 is installed on the lifting device 30, and the last section of the steel cage 80 is lifted by the positioning tool 20.

[0021] Among them, such as Figures 6-9 As shown, the positioning tool 20 includes a double-channel steel main rod 201, a double-channel steel secondary rod 202 and a positioning shaft 203. The double-channel steel main rod 201 and the double-channel steel secondary rod 202 are both horizontally arranged. Two double-channel steel main rods 201 are arranged opposite to each other, and two double-channel steel secondary rods 202 are arranged in pairs. The two ends of the double-channel steel secondary rod 202 are respectively connected to the middle parts of the two double-channel steel main rods 201. The positioning shaft 203 is vertically arranged and located at the bottom of the positioning tool 20. There are four positioning shafts 203, and the four positioning shafts 203 are respectively arranged at the two ends of the two double-channel steel main rods 201. The size, shape and position of the positioning shaft 203 correspond to the size, shape and position of the positioning groove 102 of the positioning base 10. By placing the positioning shaft 203 of the positioning tool 20 in the positioning groove 102 of the positioning base 10, rapid positioning of the steel cage 80 is achieved. The connection between the double-channel steel main rod 201 and the double-channel steel secondary rod 202 is provided with a lifting lug 204 and a steel cage connection hole 205. The lifting lug 204 is provided on the upper part of the positioning fixture 2 and can be connected to the sling 30 (lower lifting lug 304) via a steel wire rope 100. The steel cage connection hole 205 is vertically arranged and passes through the positioning fixture 20 for connecting the lifting rod 90. The double-channel steel main rod 201 and the double-channel steel secondary rod 202 are connected by a single-channel steel connection system 206 to strengthen the connection. The single-channel steel connection system 206 consists of four diagonal rods and two transverse rods. The two ends of the diagonal rods are respectively connected to the double-channel steel main rod 201 and the double-channel steel secondary rod 202, and the two ends of the transverse rods are connected to the diagonal rods.

[0022] In this embodiment, the lower lifting lug 304 is connected to the lifting lug 204 of the positioning tool 20 through the steel wire rope 100, and the steel cage connecting hole 205 is connected to the last section of the steel cage 80 through the hanging rod 90.

[0023] S4: As Figures 17 and 18 As shown, all the steel cages 80 are lowered into the borehole 40, and the positioning shaft 203 of the positioning tool 20 is placed in the positioning groove 102 of the positioning base 10. At this time, the centers of the positioning base 10, the positioning tool 20, the steel cages 80 and the steel casing 60 coincide with each other, the sediment is cleaned for a second time, and concrete is poured into the borehole 40 to form a bored pile.

[0024] The beneficial technical effects of this embodiment are: simple operation and reusability; by placing the positioning shaft of the positioning tool in the positioning groove of the positioning base, rapid positioning of the steel cage is achieved.

[0025] Although the above embodiments have described in detail the concepts and embodiments of the present invention with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the present invention without departing from the scope of the claims, so they are not described in detail here.

Claims

1. A method for lowering and positioning a large diameter bored pile reinforcement cage, characterized in that The positioning method includes: S1: Drill a construction hole and install a steel casing in the hole; Place a positioning base on the circumferential outer side of the steel casing, and make the top surface of the positioning base flush with the top surface of the steel casing and keep the positioning base and the steel casing concentric; Among them, the positioning base includes a positioning box, a positioning groove and a base positioning plate. The positioning box is annular. The positioning groove is arranged along the circumferential direction of the top of the positioning box. There are multiple base positioning plates arranged along the circumferential direction of the positioning box. The base positioning plates penetrate through the positioning box and move along the radial direction of the positioning box. Scales are provided on the base positioning plates; S2: Install a lifting tool on a crane and hoist other sections of the steel cage except the last section through the lifting tool in sequence; S3: Install a positioning tool on the lifting tool and hoist the last section of the steel cage through the positioning tool; Among them, the positioning tool includes two double-channel steel main rods, two double-channel steel secondary rods and positioning shafts. There are two relatively arranged double-channel steel main rods. There are two relatively arranged double-channel steel secondary rods. The two ends of the double-channel steel secondary rods are respectively connected to the middle parts of the two double-channel steel main rods. There are four positioning shafts. The four positioning shafts are respectively arranged at the two end parts of the two double-channel steel main rods. The sizes, shapes and positions of the positioning shafts respectively correspond to the sizes, shapes and positions of the positioning grooves of the positioning base; S4: Lower all the steel cages into the hole and place the positioning shafts of the positioning tool in the positioning grooves of the positioning base, and pour concrete into the hole to form a drilled pile.

2. A method for lowering and positioning a large diameter bored pile reinforcement cage according to claim 1, characterized in that In step S1, the method for keeping the positioning base and the steel casing concentric is: Adjust the base positioning plates to make them tightly press against the steel casing and make the scales exposed on each base positioning plate consistent, and fix the base positioning plates.

3. A method for lowering and positioning a large diameter bored pile reinforcement cage according to claim 1, characterized in that The lifting tool includes a double-channel steel cross, a connecting rod, an upper lifting ear and a lower lifting ear. The double-channel steel cross consists of four double-channel steel rods and a connecting plate. Each two adjacent ends among the four ends of the double-channel steel cross are connected through the connecting rod. The upper lifting ear and the lower lifting ear are respectively arranged at the upper and lower parts of the connection between the double-channel steel cross and the connecting rod.

4. A method for lowering and positioning a large diameter bored pile reinforcement cage according to claim 1, characterized in that A positioning plate hand hole is provided on the base positioning plate.

5. A method for lowering and positioning a large diameter bored pile reinforcement cage according to claim 1, characterized in that The base positioning plate is fixed by a locking plate and bolts.

6. A method for lowering and positioning a large diameter bored pile reinforcement cage according to claim 1, characterized in that The cross-section of the positioning box is in a C shape, and the inside of the positioning box is strengthened by base stiffening plates.

7. A method for lowering and positioning a large diameter bored pile reinforcement cage according to claim 1, characterized in that Lifting ears and steel cage connection holes are provided at the connection between the double-channel steel main rods and the double-channel steel secondary rods.

8. A method for lowering and positioning a large diameter bored pile reinforcement cage according to claim 1, characterized in that The double-channel steel main rods and the double-channel steel secondary rods are connected by single-channel steel connecting systems.

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