A construction method and device for safety protection of a reinforcement cage of a cast-in-place pile

Abstract

The present application relates to the technical field of reinforcement cage construction, and particularly relates to a cast-in-place pile reinforcement cage safety protection construction method and device, which comprises the following steps: S1, calibrating the center position of a pile foundation hole through a center positioning disc; S2, dividing the reinforcement cage into multiple units, and installing a socket sleeve at one end of each unit corresponding to the position of an ear plate; S3, hoisting the first unit, and connecting the socket sleeve with the center positioning disc, so that the ear plate is unlocked and suspended by rotating the reinforcement cage unit; S4, hoisting the remaining units in sequence, and stacking the socket sleeves in the hole opening to form a safety frame; S5, laying a fan-shaped support plate in the hole of the safety frame; S6, removing or rotating the fan-shaped support plate, and extending a grouting pipe into the reinforcement cage to perform grouting. Through the center positioning disc, the socket sleeve and the ear plate, the accurate positioning and vertical placement of each reinforcement cage unit are ensured, and the construction efficiency is improved. The safety frame formed by stacking the multiple socket sleeves provides safety protection for subsequent grouting, welding and other operations.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reinforcement cage construction, and particularly relates to a bored pile reinforcement cage safety protection construction method and device. BACKGROUND

[0002] In the construction of bored piles, the reinforcement cage is a core load-bearing component, which mainly serves to enhance the compression resistance, uplift resistance and overall stiffness of the pile body, thereby prolonging the service life of the pile body.

[0003] In the construction of the reinforcement cage, due to the limitation of the pile length and the lifting equipment capacity, the reinforcement cage is usually constructed by segmental fabrication and segmental lifting and lowering; and the reinforcement cage is manually pulled by the construction personnel to control the lowering direction to assist the falling into the pile hole.

[0004] However, due to the difficulty in synchronously controlling the force during multi-directional traction, the reinforcement cage is prone to attitude deviation such as unilateral inclination, thereby causing uneven thickness of the concrete protection layer between the hole wall and the reinforcement cage, which directly affects the load-bearing performance of the pile body; and when the reinforcement cage is lifted and put into the pile hole, the subsequent construction of the rear part of the pile hole, such as the reinforcement cage righting, welded connecting reinforcement, pouring of concrete, etc., needs to be carried out, and the construction personnel need to continuously work at the edge of the hole, and the large diameter of the pile hole opening poses a safety hazard to the workers.

[0005] The information disclosed in this BACKGROUND section is only for the purpose of enhancing the understanding of the general background of the present disclosure and should not be taken as admitting that such information is prior art known to those of ordinary skill in the art. SUMMARY

[0006] The present application provides a bored pile reinforcement cage safety protection construction method and device, which can effectively solve the problems in the background art.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0008] A bored pile reinforcement cage safety protection construction method, comprising the following steps:

[0009] S1, installing a derrick at the pile foundation hole opening, and aligning the center position of the pile foundation hole through the center positioning disc of the derrick;

[0010] S2, dividing the reinforcement cage into multiple reinforcement cage units according to the depth of the pile foundation hole, and installing a socket sleeve at the position corresponding to the ear plate at one end of each reinforcement cage unit, wherein the axis of the socket sleeve coincides with the center line of the reinforcement cage;

[0011] S3, the hoisting device hoists the first section of the reinforcement cage unit, and the one end of the socket sleeve is lowered into the hole and connected with the socket of the center positioning disc. The reinforcement cage unit is rotated, the lug plate of the lowered end is unlocked, and then the lowered end is continuously lowered. After reaching the preset position, it is rotated, and the lug plate at the other end is matched and locked with the socket sleeve to complete the hovering and fixing of the reinforcement cage unit;

[0012] S4, the hoisting connection of the first section of the reinforcement cage unit is released, and the remaining reinforcement cage units are hoisted in sequence. The socket sleeves of the rear section of the reinforcement cage units are matched with the sockets of the center positioning disc in sequence, and the safety frame is formed by stacking at the hole opening.

[0013] S5, after the splicing of all the reinforcement cage units is completed, the fan-shaped support plates are laid in the hole of the safety frame to form a protection platform.

[0014] S6, when grouting, the fan-shaped support plates are removed or rotated, and the grouting pipe is inserted into the reinforcement cage for grouting.

[0015] Further, in step S1, the installation reference surface of the derrick is perpendicular to the axis of the pile hole, and the center position of the pile hole is calibrated and marked by the center positioning disc preset on the derrick. The specific steps are as follows:

[0016] S11, the derrick is fixed to the hole peripheral concrete foundation through the expansion bolts, and the center positioning disc is placed on the top of the derrick;

[0017] S12, a plurality of laser ranging sensors are evenly distributed along the circumference of the center positioning disc, and a level is installed on the upper surface of the center positioning disc;

[0018] S13, the level is used to calibrate the horizontal state of the center positioning disc, the distance from each laser ranging sensor to the inner wall of the pile hole is measured, and the position of the center positioning disc is adjusted based on the average value of the measured distances to ensure that the center position of the center positioning disc is aligned with the center position of the pile hole;

[0019] S14, after the center position of the pile hole is calibrated, the center positioning disc is fixed to the top of the derrick through bolts, and a positioning rod is detachably installed on the center positioning disc. The top end of the positioning rod is higher than the upper surface of the center positioning disc and is used for initial guidance when the socket sleeve is connected.

[0020] Further, in step S2, a plurality of connecting steels are arranged between the lug plate and the end of the reinforcement cage unit at the end away from the socket sleeve.

[0021] The plurality of connecting steels constitute a connecting section, and each connecting steel is arranged in a staggered manner in height along the circumference of the reinforcement cage unit. The connecting steels of the two sections of the reinforcement cage unit are one-to-one corresponding and adapted in position and height.

[0022] Further, in step S3, the main hoisting tool and the auxiliary hoisting tool are used to hoist the first section of the reinforcement cage unit when the hoisting device is hoisting the first section of the reinforcement cage unit;

[0023] The hoisting point of the main hoisting tool is fixed to the butt joint section of the reinforcement cage unit by a sling, and the hoisting point of the auxiliary hoisting tool is fixed to the middle position of the reinforcement cage unit by a sling, or is fixed to the middle position and the end position of the socket sleeve at the same time, forming a double auxiliary hoisting point.

[0024] Further, in step S3, when the socket sleeve is connected with the center positioning disc, the multiple support seats of the ear plate in the circumferential direction are correspondingly arranged in the multiple fan-shaped grooves on the upper surface of the socket sleeve, so that the suspension locking of the reinforcement cage unit is realized.

[0025] When the reinforcement cage unit is rotated along the circumferential direction to the through groove in the fan-shaped groove, each support seat slides along the fan-shaped groove to the corresponding through groove position, the support seat extends downward along the axial direction through the through groove, the suspension locking constraint is released, and the reinforcement cage unit can continue to be lowered along the pile hole axis.

[0026] Further, in step S4, the socket sleeves of the sections of the reinforcement cage unit are sequentially stacked along the axial direction of the center positioning disc, the end of the socket sleeve is guided downward by the positioning rod on the center positioning disc during the stacking, and the lower end surface of the socket sleeve of the rear section is fully attached to the upper end surface of the socket sleeve of the front section.

[0027] The application also provides a safety protection device for a cast-in-place pile reinforcement cage, which is applied to the cast-in-place pile reinforcement cage safety protection construction method.

[0028] The center positioning disc is fixedly arranged at the center position of the top of the derrick and is uniformly provided with multiple positioning rods along the circumference thereof;

[0029] The socket sleeve is uniformly provided with multiple fan-shaped grooves on the top surface thereof along the circumferential direction, is provided with a through groove penetrating along the axial direction of the socket sleeve in the region of each fan-shaped groove, and is provided with a positioning hole with an opening facing the outside on the outer cylindrical surface thereof;

[0030] When the two sections of the reinforcement cage unit are butt jointed, the socket sleeve of the rear section of the reinforcement cage unit is connected with the positioning rod of the center positioning disc through the positioning hole, is guided and stacked above the socket sleeve of the front section of the reinforcement cage unit along the axial direction of the positioning rod;

[0031] The through grooves of the two sections of the socket sleeve are axially aligned to form a channel for the sliding unlocking of the support seat on the ear plate of the reinforcement cage unit, and all the stacked socket sleeves form a safety frame around the pile hole.

[0032] Further, multiple ear plates are welded along the axial direction of the reinforcement cage.

[0033] Further, the ear plate comprises a ring-shaped guard plate and a plurality of support seats arranged circumferentially along the ring-shaped guard plate.

[0034] The ring-shaped guard plate is wrapped along the whole circumference of the reinforcement cage unit in the circumferential direction, and the plurality of support seats are arranged corresponding to the through grooves of the socket sleeve.

[0035] The support seat is embedded in the through groove of the socket sleeve, forms a transition fit with the side wall of the through groove, and the support seat can slide along the axial direction of the through groove.

[0036] Further, the plurality of positioning rods are uniformly distributed along the outer circumference of the socket sleeve.

[0037] And the positioning rod is vertically welded to the end face of the center positioning disc, and the axis of the positioning rod is parallel to the axis of the center positioning disc.

[0038] Through the technical scheme of the present application, the following technical effects can be achieved:

[0039] Through the triple positioning structure of the center positioning disc, the socket sleeve and the ear plate, the center line of the reinforcement cage can be constrained to coincide with the center line of the pile hole, avoiding unilateral inclination, torsion and other attitude deviations caused by manual pulling, solving the problem of inclination of the reinforcement cage caused by traditional manual pulling; after the socket sleeves of each segment of the reinforcement cage are positioned with the derrick, a safe frame can be formed by stacking at the hole opening, and a protective platform formed by splicing the fan-shaped support plates can fully cover the pile hole opening, completely eliminating the risk of personnel and tool falling. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0041] Figure 1 Schematic diagram of hoisting the reinforcement cage unit into the pile hole;

[0042] Figure 2 Top view of the reinforcement cage unit;

[0043] Figure 3 Lower view of the socket sleeve;

[0044] Figure 4 A is a partial enlarged view of Figure 3

[0045] Figure 5 A is a partial enlarged view of Figure 1 ​a local enlarged view of B in FIG. 1;

[0046] Figure 6 a schematic view of the installation of the ear plate in the socket sleeve;

[0047] Figure 7 a schematic view of the unlocking action of the ear plate in the socket sleeve;

[0048] Figure 8 a schematic view of the structure of the safety frame formed by stacking multiple socket sleeves.

[0049] Fig. 1 is a schematic view of a safety frame formed by stacking multiple socket sleeves. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0052] The present application provides a construction method for safety protection of a cast-in-place pile reinforcement cage, comprising the following steps:

[0053] S1, installing a derrick 1 at a pile foundation hole, and aligning the center position of the pile foundation hole through a preset center positioning disc 2 of the derrick 1;

[0054] In step S1, the installation reference surface of the derrick 1 is perpendicular to the axis of the pile foundation hole, and the center position of the pile foundation hole is aligned and marked through the preset center positioning disc 2 of the derrick 1. The specific steps are as follows:

[0055] S11, fixing the derrick 1 to the periphery of the hole through expansion bolts, and placing the center positioning disc 2 on the top of the derrick 1;

[0056] S12, evenly distributing 3-4 laser ranging sensors along the circumference of the center positioning disc 2, and installing a level on the upper surface of the center positioning disc 2;

[0057] S13, calibrate the horizontal state of the center positioning disc 2 through the level, measure the distance to the inner wall of the pile hole by using each laser ranging sensor, and adjust the position of the center positioning disc 2 based on the average value of the measured distance to ensure that the center position of the center positioning disc 2 is aligned with the center position of the pile hole;

[0058] S14, after calibrating the center position of the pile hole, fix the center positioning disc 2 on the top of the derrick 1 through bolts, and detachably install the positioning rod 21 on the center positioning disc 2, the top end of the positioning rod 21 is higher than the upper surface of the center positioning disc 2, and is used for initial guidance when the socket sleeve 3 is butt-jointed.

[0059] By measuring and averaging the uniformly arranged laser ranging sensors, and calibrating the horizontal state of the center positioning disc 2 through the level, the center positioning error of the pile hole is ≤±1mm, which solves the problem of low precision of the traditional positioning method and lays a foundation for the accurate butt joint of the subsequent reinforcement cage. The setting of the positioning rod 21 can provide initial guidance when the socket sleeve 3 is butt-jointed, so that the socket sleeve 3 can be quickly aligned with the center of the pile hole when it is lowered, avoiding repeated adjustment, shortening the butt joint time of the single segment reinforcement cage unit 100, and improving the construction efficiency.

[0060] S2, divide the reinforcement cage into multiple reinforcement cage units 100 according to the depth of the pile hole, install the socket sleeve 3 at the end of each reinforcement cage unit 100 corresponding to the position of the lug plate 4, and the axis of the socket sleeve 3 coincides with the center line of the reinforcement cage;

[0061] In step S2, a plurality of connecting steels are arranged between the lug plate 4 and the end of the reinforcement cage unit 100 at the end away from the socket sleeve 3;

[0062] The plurality of connecting steels constitute a butt joint section, and each connecting steel is arranged in a staggered manner in the circumferential direction of the reinforcement cage unit 100, and the connecting steels of the two reinforcement cage units 100 are one-to-one corresponding and adapted in position and height. It should be noted that the butt joint section of the previous reinforcement cage unit 100 is embedded in the inside of the end of the next reinforcement cage unit 100 close to the socket sleeve 3, and the length of the connecting steel does not interfere with the cooperation of the lug plate 4 and the center positioning disc 2 of the derrick 1.

[0063] The connecting steels are arranged in a staggered manner, and when the butt joint section of the previous segment is embedded in the next segment, the height adaptation and circumferential position alignment of the long and short steels forcibly constrain the center lines of the two reinforcement cage units 100 to be collinear, reduce the coaxiality error of butt joint, and avoid the inclination of the reinforcement cage; and the staggered connecting steels increase the contact area and friction force of the two units, reduce the torsion or displacement caused by lifting and lowering after butt joint, and further ensure the perpendicularity of the whole reinforcement cage.

[0064] S3, the hoisting device hoists the first section of the reinforcement cage unit 100, and one end of the socket sleeve 3 is lowered into the hole and connected with the center positioning disc 2, and the reinforcement cage unit 100 is rotated to unlock the lug plate 4 at the lowered end and continue to be lowered, and after reaching the preset position, it is rotated and locked through the lug plate 4 at the other end and the socket sleeve 3, and the suspension and fixation of the reinforcement cage unit 100 are completed;

[0065] In step S3, when the hoisting device hoists the first section of the reinforcement cage unit 100, the main hoisting tool and the auxiliary hoisting tool are cooperatively hoisted.

[0066] The lifting point of the main hoisting tool is fixed to the butt joint section of the reinforcement cage unit 100 through a lifting cable, and the lifting point of the auxiliary hoisting tool is fixed to the intermediate position of the reinforcement cage unit 100 through a lifting cable, or is fixed to the intermediate position and the end position of the socket sleeve 3 at the same time, forming double auxiliary lifting points.

[0067] The specific process is as follows: the main hoisting tool and the auxiliary hoisting tool are selected; the main hoisting tool and the auxiliary hoisting tool are transferred to the lifting position, the lifting point of the main hoisting tool is fixed to the butt joint section of the reinforcement cage unit 100 through a lifting cable, and the lifting point corresponds to the main reinforcement position of the reinforcement cage unit 100, and the lifting point of the auxiliary hoisting tool is fixed to the intermediate position of the reinforcement cage unit 100 through a lifting cable, or is fixed to the intermediate position and the end position of the socket sleeve 3 at the same time, forming double auxiliary lifting points; the main hoisting tool and the auxiliary hoisting tool are synchronously started to horizontally lift, the reinforcement cage unit 100 is hoisted to a set height from the ground, then the main hoisting tool is slowly lifted, and the lifting speed of the auxiliary hoisting tool is adjusted in real time according to the distance from the tail of the reinforcement cage unit 100 to the ground, and the perpendicularity of the reinforcement cage unit 100 is observed through a lifting line hammer until the axis of the reinforcement cage unit 100 is perpendicular to the ground; the lifting point of the auxiliary hoisting tool on the reinforcement cage is removed; the main hoisting tool is slowly moved to accurately connect the socket sleeve 3 with the center positioning disc 2, and the center positioning of the reinforcement cage unit 100 is completed.

[0068] The rated lifting capacity of the main hoisting tool and the auxiliary hoisting tool is reserved with a safety margin, and the lifting points are uniformly distributed along the circumference of the main reinforcement, so as to avoid deformation and lifting cable rupture risk of the reinforcement cage unit 100 caused by uneven stress during hoisting.

[0069] In step S3, when the socket sleeve 3 is connected with the center positioning disc 2, the multiple support seats 42 of the lug plate 4 in the circumferential direction are correspondingly arranged in the multiple fan-shaped grooves 31 on the upper surface of the socket sleeve 3, so as to achieve the suspension and locking of the reinforcement cage unit 100.

[0070] When the reinforcement cage unit 100 rotates along the circumferential direction to the through groove 32 in the sector groove 31, each support seat 42 slides along the sector groove 31 to the position of the corresponding through groove 32, the support seat 42 extends downward along the axial direction through the through groove 32, the hovering locking constraint is released, and the reinforcement cage unit 100 can continue to be lowered along the axis of the pile hole.

[0071] The arc of the sector groove 31 is matched with the support seat 42 on the lug plate 4, and the width of the through groove 32 is greater than the width of the support seat 42; the support seat 42 is supported by the stepped surface of the sector groove 31 to realize hovering locking, so that the reinforcement cage unit 100 does not accidentally slide during lowering, and the through groove 32 guides the support seat 42 to ensure that the lowering direction is not deviated after unlocking, thereby solving the problems of difficult positioning and easy shaking of the reinforcement cage unit 100 during lowering, and the structure is simple, without the need for additional locking components, thereby reducing the processing and construction costs.

[0072] S4, release the hoisting connection of the first section of the reinforcement cage unit 100, and sequentially hoist the remaining reinforcement cage units 100, the socket sleeve 3 of the rear section of the reinforcement cage unit 100 is sequentially matched with the socket of the center positioning disc 2 to form a safety frame by stacking at the hole opening;

[0073] In step S4, the socket sleeves 3 of the reinforcement cage units 100 are sequentially stacked along the axial direction of the center positioning disc 2, and the end of the socket sleeve 3 is guided and lowered by the positioning rod 21 on the center positioning disc 2 during stacking, until the lower end surface of the socket sleeve 3 of the rear section is fully matched with the upper end surface of the socket sleeve 3 of the front section.

[0074] During hoisting, the positioning rod 21 on the center positioning disc 2 guides the socket sleeve 3, solves the problems of easy tilting and center deviation during hoisting, further reduces the perpendicularity deviation of the reinforcement cage unit 100, realizes accurate butt joint of each section, and the positioning rod 21 does not need to be adjusted by the construction personnel, the lowering process only needs to be adjusted by the hoisting device, the stacking time of the socket sleeve 3 of a single section is shortened, the construction efficiency is greatly improved, and the dependence on the operation experience of the personnel is reduced.

[0075] S5, after all the reinforcement cage units 100 are spliced, a sector support plate is laid in the hole of the safety frame to form a protection platform;

[0076] S6, during grouting, the sector support plate is removed or rotated, and the grouting pipe is inserted into the reinforcement cage for grouting.

[0077] During construction, the center positioning disc 2, the socket sleeve 3 and the lug plate 4 ensure the accurate positioning and vertical lowering of each section of the reinforcement cage unit 100, improve the construction efficiency, and form a reliable safety protection structure through the stacking of the socket sleeves 3 of multiple sections, which provides safety protection for subsequent grouting, welding and other operations.

[0078] Through the triple positioning structure of the center positioning disc 2, the socket sleeve 3 and the ear plate 4, the center line of the reinforcement cage can be constrained to coincide with the center line of the pile hole, and the attitude deviation caused by manual pulling, such as one-sided inclination and torsion, can be avoided, and the problem of inclination of the reinforcement cage caused by traditional manual pulling can be completely solved; after the socket sleeve 3 of each section of the reinforcement cage unit 100 is positioned and matched with the derrick 1, a safety frame can be formed by stacking at the hole opening, and a protection platform formed by splicing the fan-shaped support plates can be matched to completely cover the pile hole opening and completely eliminate the risk of personnel and tool falling.

[0079] The application also provides a cast-in-place pile reinforcement cage safety protection device, as shown in the drawings, which comprises a center positioning disc 2 and a socket sleeve 3. Figures 1-8 The center positioning disc 2 is fixedly arranged at the center position of the top of the derrick 1, and a plurality of positioning rods 21 are uniformly arranged along the circumference thereof; the top surface of the socket sleeve 3 is uniformly provided with a plurality of fan-shaped grooves 31 in the circumferential direction, a through groove 32 penetrating the socket sleeve 3 in the axial direction is arranged in the area of each fan-shaped groove 31, and a positioning hole 33 with an opening facing the outside is arranged on the outer cylindrical surface of the socket sleeve 3.

[0080] When the two adjacent sections of the reinforcement cage unit 100 are butted, the socket sleeve 3 of the latter section of the reinforcement cage unit 100 is butted and matched with the positioning hole 33 and the positioning rod 21 of the center positioning disc 2, is guided in the axial direction of the positioning rod 21 and is stacked above the socket sleeve 3 of the former section of the reinforcement cage unit 100; until the end surfaces of the two socket sleeves 3 are attached.

[0081] The through grooves 32 of the two socket sleeves 3 are axially aligned to form a channel for the sliding unlocking of the support seat 42 on the ear plate 4 of the reinforcement cage unit 100, and all the stacked socket sleeves 3 form a safety frame around the pile hole opening.

[0082] When the first section of the reinforcement cage unit 100 is hoisted, the socket sleeve 3 thereof is butted and matched with the positioning hole 33 and the positioning rod 21 of the center positioning disc 2, the support seat 42 on the ear plate 4 is clamped in the fan-shaped groove 31, and hovering locking is realized; when the subsequent reinforcement cage unit 100 is hoisted, the positioning hole 33 of the socket sleeve 3 of the latter section is aligned with the positioning rod 21 and is slowly lowered, is guided in the axial direction of the positioning rod 21 and is stacked above the socket sleeve 3 of the former section, until the end surfaces of the two socket sleeves 3 are attached, the through grooves 32 are axially aligned, the support seat 42 can be slid and unlocked through the aligned through grooves 32, and overall lowering is realized; after the hoisting of all the reinforcement cage units 100 is completed, all the socket sleeves 3 are stacked on the center positioning disc 2 along the positioning rod 21 to form a safety frame at the pile hole opening; after the hoisting is completed, a plurality of fan-shaped support plates are installed in the inner hole of the safety frame, and the plurality of fan-shaped support plates can be folded or fully laid on the entire pile hole opening part, so that the fan-shaped support plates can be moved as needed during the construction of the pile hole opening part, which not only ensures the safety of construction but also does not affect the normal construction.

[0083] The precise positioning and splicing of the segmented reinforcement cage unit 100 is realized through the socket sleeve 3, ensuring that the center line of each segment of the reinforcement cage unit 100 coincides with the center line of the pile hole when being lowered, and guaranteeing the overall perpendicularity deviation of the reinforcement cage unit 100, thereby significantly improving the structural integrity and bearing capacity of the cast-in-place pile; and the socket sleeves 3 of the segments of the reinforcement cage unit 100 are sequentially socketed on the center positioning disc 2 to form a safety frame surrounding the pile hole, which can directly cover the gap of the pile hole and does not need to additionally set up a protective structure, thereby providing safety protection for subsequent construction.

[0084] As a preferred embodiment of the above, a plurality of ear plates 4 are welded along the axial direction of the reinforcement cage unit 100. During the lowering process of the reinforcement cage unit 100, each axial ear plate 4 passes through the through slot 32 of the socket sleeve 3 to continuously center and guide the reinforcement cage unit 100 and inhibit radial swinging; preferably, the ear plate 4 comprises a ring-shaped guard plate 41 and a plurality of support seats 42 arranged circumferentially along the ring-shaped guard plate 41; the ring-shaped guard plate 41 fully covers the circumference of the reinforcement cage unit 100, and the plurality of support seats 42 are arranged correspondingly to the through slot 32 of the socket sleeve 3; the support seat 42 is embedded in the through slot 32 of the socket sleeve 3 and forms a transition fit with the side wall of the through slot 32, and the support seat 42 can slide along the axial direction of the through slot 32.

[0085] The ring-shaped guard plate 41 fully covers the reinforcement cage and is fully welded with the main reinforcement and the reinforcing bar to effectively disperse the radial force transmitted by the support member and avoid bending of the main reinforcement and deformation of the reinforcing bar caused by stress concentration in the local reinforcement cage; the welding of the support seat 42 and the ring-shaped guard plate 41 ensures the connection strength, and even under the working conditions of long-distance lowering and hole wall friction, the support seat 42 will not fall off and the ring-shaped guard plate 41 will not loosen. The design of the transition fit not only ensures the centering accuracy, but also leaves a small clearance for movement, avoiding the support member from being stuck in the slot wall and reducing the sliding resistance during lowering.

[0086] In the preferred embodiment of the present application, a plurality of positioning rods 21 are uniformly distributed along the outer circumference of the socket sleeve 3; and the positioning rod 21 is vertically welded to the end face of the center positioning disc 2, and the axis of the positioning rod 21 is parallel to the axis of the center positioning disc 2.

[0087] When socketing, the positioning rod 21 is inserted into the positioning hole 33 along the axial direction to form an outer side guiding fit, which can more uniformly resist the radial eccentric force of the reinforcement cage unit 100 during lowering, further strengthen the overall stability of the stacked multi-segment socket sleeve 3, and avoid tilting of the safety frame caused by uneven stress.

[0088] Although the present application has been described in connection with certain specific features and embodiments thereof, it is to be understood that it is provided as an example to the best of the applicant's knowledge and that various modifications and combinations will occur to those skilled in the art. Accordingly, all modifications, combinations and equivalents that fall within the scope of the application are intended to be included herein. It is evident that those skilled in the art can, without departing from the scope of the application, make various changes and modifications of the application to adapt it to various usages and conditions. Thus, such changes and modifications are intended to be included within the scope of the application as defined in the appended claims.

Claims

1. A construction method for safety protection of a reinforcement cage of a cast-in-place pile, characterized in that, The method comprises the following steps: S1, installing a derrick at a pile foundation hole mouth, and calibrating the center position of the pile foundation hole through a preset center positioning disc of the derrick; S2, dividing the steel reinforcement cage into multiple steel reinforcement cage units according to the depth of the pile foundation hole, and installing a socket sleeve at one end of each steel reinforcement cage unit corresponding to the position of the lug plate, the axis of the socket sleeve coinciding with the center line of the steel reinforcement cage; S3, hoisting the first steel reinforcement cage unit by a hoisting device, and lowering the one end of the socket sleeve downward into the hole and connecting with the center positioning disc, rotating the steel reinforcement cage unit, and continuing to lower the lug plate at the lowered end after being unlocked, and then rotating to lock the other end of the lug plate with the socket sleeve after reaching the preset position, thereby completing the hovering fixation of the steel reinforcement cage unit; S4, releasing the hoisting connection of the first steel reinforcement cage unit, and hoisting the remaining steel reinforcement cage units in sequence, and the socket sleeves of the rear steel reinforcement cage units are connected with the center positioning disc in sequence, and the safety frame is formed by stacking at the hole mouth; S5, after the connection of all steel reinforcement cage units is completed, laying a fan-shaped support plate in the hole of the safety frame to form a protection platform; S6, when grouting, the fan-shaped support plate is removed or rotated, and a grouting pipe is inserted into the steel reinforcement cage for grouting; In step S3, when the socket sleeve is connected with the center positioning disc, the multiple support seats of the lug plate in the circumferential direction are correspondingly arranged in the multiple fan-shaped grooves on the upper surface of the socket sleeve, thereby realizing the hovering locking of the steel reinforcement cage unit; When the steel reinforcement cage unit is rotated to the through groove in the fan-shaped groove in the circumferential direction, each support seat slides to the corresponding through groove position along the fan-shaped groove, the support seat extends downward along the axial direction through the through groove, the hovering locking constraint is released, and the steel reinforcement cage unit can continue to be lowered along the axis of the pile foundation hole.

2. The construction method of the cast-in-place pile reinforcement cage safety protection according to claim 1, characterized in that, In step S1, the installation reference surface of the derrick is perpendicular to the axis of the pile foundation hole, the center position of the pile foundation hole is calibrated and marked through the preset center positioning disc of the derrick, and the specific steps are as follows: S11, fixing the derrick to the hole mouth peripheral concrete foundation through expansion bolts, and placing the center positioning disc on the top of the derrick; S12, evenly distributing multiple laser ranging sensors along the circumference of the center positioning disc, and installing a level on the upper surface of the center positioning disc; S13, calibrating the horizontal state of the center positioning disc through the level, measuring the distance to the inner wall of the pile foundation hole by using each laser ranging sensor, adjusting the position of the center positioning disc based on the average value of the measured distance, and ensuring that the center position of the center positioning disc is aligned with the center position of the pile foundation hole; S14, after calibrating the center position of the pile foundation hole, fixing the center positioning disc to the top of the derrick through bolts, and detachably installing a positioning rod on the center positioning disc, the top end of the positioning rod being higher than the upper surface of the center positioning disc, and being used for initial guidance when the socket sleeve is connected.

3. The construction method of the cast-in-place pile reinforcement cage safety protection according to claim 1, characterized in that, In step S2, a plurality of connecting steels are arranged between the lug plate and the end of the steel reinforcement cage unit away from the socket sleeve; The plurality of connecting steels constitute a connecting section, and each connecting steel is arranged in a staggered manner in height along the circumferential direction of the steel reinforcement cage unit, and the connecting steels of the two steel reinforcement cage units are one-to-one corresponding and adapted in position and height.

4. The construction method of safety protection for reinforcement cage of cast-in-place pile according to claim 1, characterized in that, In step S3, the first steel reinforcement cage unit is hoisted by the hoisting device through the cooperation of the main hoisting tool and the auxiliary hoisting tool. The lifting point of the main hoisting tool is fixed to the butt joint section of the reinforcement cage unit by a sling, and the lifting point of the auxiliary hoisting tool is fixed to the middle position of the reinforcement cage unit by a sling, or is fixed to the middle position and the end position of the socket sleeve at the same time, forming double auxiliary lifting points.

5. The construction method of safety protection for reinforcement cage of cast-in-place pile according to claim 1, characterized in that, In step S4, the socket sleeves of the reinforcement cage units are sequentially stacked along the axial direction of the center positioning disc, and the end of the socket sleeve is guided and lowered by the positioning rod on the center positioning disc during stacking until the lower end surface of the rear socket sleeve fully matches the upper end surface of the front socket sleeve.

6. A safety device for a reinforcement cage of a cast-in-place pile, characterized in that, The device is applied to the safety protection construction method of the cast-in-place pile reinforcement cage as claimed in any one of claims 1-5, and the device comprises: a center positioning disc fixedly arranged at the center position of the top of the derrick and provided with a plurality of positioning rods uniformly distributed along the circumference thereof; a socket sleeve provided with a plurality of fan-shaped grooves uniformly distributed along the circumference of the top surface thereof, and provided with a through groove penetrating along the axial direction of the socket sleeve in the area of each fan-shaped groove, and the outer cylindrical surface of the socket sleeve is provided with a positioning hole with an opening facing the outside; when two reinforcement cage units are butt jointed, the socket sleeve of the rear reinforcement cage unit is butt jointed with the positioning hole and the positioning rod of the center positioning disc, and is guided and stacked above the socket sleeve of the front reinforcement cage unit along the axial direction of the positioning rod; the through grooves of the two socket sleeves are axially aligned to form a channel for the sliding unlocking of the support seat on the ear plate of the reinforcement cage unit, and all the stacked socket sleeves form a safety frame around the pile hole.

7. A cast in place pile reinforcement cage safety shield according to claim 6 wherein, A plurality of ear plates are welded along the axial direction of the reinforcement cage.

8. A cast in place pile reinforcement cage safety shield according to claim 7, characterised in that, The ear plate comprises a ring-shaped guard plate and a plurality of support seats arranged along the circumference of the ring-shaped guard plate; the ring-shaped guard plate fully covers the circumference of the reinforcement cage unit, and the plurality of support seats are correspondingly arranged with the through grooves of the socket sleeve; the support seat is embedded in the through groove of the socket sleeve and forms a transition fit with the side wall of the through groove, and the support seat can slide along the axial direction of the through groove.

9. The cast-in-place pile reinforcement cage safety protection device according to claim 6, characterized in that, The plurality of positioning rods are uniformly distributed along the outer circumference of the socket sleeve; and the positioning rod is vertically welded to the end surface of the center positioning disc, and the axis of the positioning rod is parallel to the axis of the center positioning disc.

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