A method of splicing a pile foundation reinforcement cage

Abstract

The present application relates to the field of pile foundation engineering, and particularly relates to a method for lengthening a pile foundation reinforcement cage, comprising the following steps: manufacturing a second section of reinforcement cage based on a first section of reinforcement cage, and setting a positioning mark between the first section of reinforcement cage and the second section of reinforcement cage; hoisting the second section of reinforcement cage to above the first section of reinforcement cage, and aligning the second section of reinforcement cage with the first section of reinforcement cage through the positioning mark; connecting a group of longitudinal load-bearing steels closest to the first section of reinforcement cage and the second section of reinforcement cage by using a threaded sleeve, determining another group of longitudinal load-bearing steels in a relative position to the first group of longitudinal load-bearing steels as a second group and connecting the same, and continuing to connect the remaining groups of longitudinal load-bearing steels by using the threaded sleeve, and completing the installation of the reinforcement cage. The present application confirms the corresponding relationship and the connection sequence of the longitudinal load-bearing steels of the two sections of reinforcement cage through the positioning mark, and effectively solves the problem of a large butt joint gap of some longitudinal load-bearing steels in the splicing operation of the upper and lower sections of reinforcement cage.

Description

Technical Field

[0001] This invention relates to the field of pile foundation engineering, and in particular to a method for extending a pile foundation reinforcement cage. Background Technology

[0002] In the construction process of cast-in-place piles, the fabrication and installation of the reinforcing cage are crucial steps. Typically, the reinforcing cage is first fabricated in sections at a factory according to design requirements. After completion, it is transported to the construction site. At the construction site, these prefabricated sections of the reinforcing cage are sequentially placed into the pile hole, and are spliced ​​together during the placement process. During splicing, sleeves are used to connect the longitudinal reinforcing bars of the upper and lower sections of the cage, thus constructing a complete reinforcing cage structure.

[0003] However, in actual splicing operations of the upper and lower sections of the reinforcing cage, the positioning of the two sections is often arbitrary, easily resulting in large gaps after the longitudinal reinforcing bars are joined. This gap problem will seriously affect the integrity of the reinforcing cage, thus adversely affecting the quality and performance of the cast-in-place pile. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem in the prior art where, during the splicing of upper and lower sections of a reinforcing cage, large gaps easily occur after the longitudinal reinforcing bars are joined, severely affecting the overall integrity of the reinforcing cage. Therefore, this invention provides a method for splicing pile foundation reinforcing cages.

[0005] This invention provides a method for extending a pile foundation reinforcement cage, comprising the following steps:

[0006] S1: Construct a second steel cage based on the first steel cage section, and set positioning marks between the first steel cage section and the second steel cage section; S2: Transfer the first section of the reinforcing cage and support it on the casing, hoist the second section of the reinforcing cage above the first section of the reinforcing cage, and align the second section of the reinforcing cage with the first section of the reinforcing cage using the positioning marks; S3: Use a threaded sleeve to connect the group of longitudinal reinforcing bars that are closest to each other between the first section of the reinforcing cage and the second section of the reinforcing cage, and designate the group of longitudinal reinforcing bars that are closest to each other as the first group of longitudinal reinforcing bars. Designate another group of longitudinal reinforcing bars that is in a relative position to the first group of longitudinal reinforcing bars as the second group. Adjust the second section of the reinforcing cage around the connection position of the first group of longitudinal reinforcing bars so that the two longitudinal reinforcing bars in the second group are close to each other. Then use a threaded sleeve to connect the second group of longitudinal reinforcing bars. S4: Referring to step S3, continue to find the group of longitudinal reinforcing bars that are not connected and are closest to each other between the first section of the steel cage and the second section of the steel cage, and connect the group of longitudinal reinforcing bars and the longitudinal reinforcing bars that are in the opposite position to the group of longitudinal reinforcing bars using threaded sleeves. Repeat step S4 until all the longitudinal reinforcing bars of the first section of the steel cage and the second section of the steel cage are connected.

[0007] This invention provides a method for extending a pile foundation reinforcement cage. In step S1, a second reinforcement cage is fabricated based on a first reinforcement cage section, thus completing the fabrication of the second reinforcement cage section. This ensures that the longitudinal reinforcing bars on the second reinforcement cage section are aligned one-to-one with the corresponding longitudinal reinforcing bars in the first reinforcement cage section. By setting positioning marks between the first and second reinforcement cage sections, the correspondence between the longitudinal reinforcing bars in the two sections can be quickly confirmed during the installation phase, ensuring consistency with the correspondence set during the fabrication phase. This marking method effectively solves the problem of large gaps after the jointing of some longitudinal reinforcing bars during the extension of the upper and lower reinforcement cage sections, thereby improving the overall integrity of the reinforcement cage. In step S3, a threaded sleeve is used to connect the closest unconnected set of longitudinal reinforcing bars between the first and second reinforcement cage sections. Since this set of longitudinal reinforcing bars is the closest, the operation is the most convenient, thus improving connection efficiency. Next, another set of longitudinal reinforcing bars in a position opposite to the first set of longitudinal reinforcing bars is designated as the second set, which is the set farthest from the first set of longitudinal reinforcing bars. Adjust the second section of the reinforcing cage around the connection position of the first group of longitudinal reinforcing bars, so that the two longitudinal reinforcing bars in the second group are close together. Then, use a threaded sleeve to connect the second group of longitudinal reinforcing bars. After connecting these two groups of longitudinal reinforcing bars, the two longitudinal reinforcing bars in the other groups will also move closer together, providing convenient adjustment conditions for connecting the remaining groups of longitudinal reinforcing bars, thereby further improving the overall construction efficiency. In step S4, referring to step S3, continue to connect the remaining groups of longitudinal reinforcing bars, which can ensure the smooth and rapid completion of the splicing operation of the two sections of the reinforcing cage.

[0008] This invention provides a method for extending a pile foundation reinforcement cage. By setting positioning marks between the first and second sections of the reinforcement cage, the correspondence between the longitudinal reinforcing bars of the two sections can be quickly confirmed during the installation phase, ensuring consistency with the correspondence set during the fabrication phase. This marking method, along with the practice of first butt-joining the closest set of longitudinal reinforcing bars, allows for overall alignment of the ends of the upper and lower reinforcement cages. This effectively reduces the gap at the joint of the longitudinal reinforcing bars, solving the problem of large gaps at the joints of some longitudinal reinforcing bars during the splicing of the upper and lower sections, thereby improving the overall integrity and joint quality of the reinforcement cage.

[0009] Preferably, step S1 includes the following steps: S11: Place the first section of the steel cage horizontally on the support frame, and temporarily connect a new batch of longitudinal reinforcing bars to the longitudinal reinforcing bars of the first section of the steel cage through threaded sleeves, thereby completing the fabrication of the second section of the steel cage. S12: Set a first mark and a second mark on one of the sets of longitudinal reinforcing bars that are temporarily connected to each other on the first section of the reinforcing cage and the second section of the reinforcing cage, and disconnect the temporary connection between the first section of the reinforcing cage and the second section of the reinforcing cage.

[0010] In this step, a new batch of longitudinal reinforcing bars is temporarily connected to the longitudinal reinforcing bars of the first section of the reinforcing cage using threaded sleeves, thereby completing the fabrication of the second section of the reinforcing cage. This ensures that the longitudinal reinforcing bars in the second section of the reinforcing cage are aligned one-to-one with the corresponding longitudinal reinforcing bars in the first section. Using the first mark on the first section of the reinforcing cage and the second mark on the second section, the correspondence between the longitudinal reinforcing bars of the two sections can be quickly confirmed during the installation phase, ensuring consistency with the correspondence set during the fabrication phase.

[0011] Preferably, in step S11, after temporarily connecting a new batch of longitudinal reinforcing bars to the longitudinal reinforcing bars of the first section of the reinforcing cage through a threaded sleeve, a circumferential positioning bar is placed in the middle of the new batch of longitudinal reinforcing bars, and the circumferential positioning bar is welded to the new batch of longitudinal reinforcing bars. Spiral hoops are wrapped around the outside of the new batch of longitudinal reinforcing bars and welded, thereby completing the fabrication of the second section of the reinforcing cage.

[0012] In this design, the circumferential positioning reinforcement serves to position and connect the various dispersed longitudinal reinforcing bars into a whole, enhancing the overall structural stability of the reinforcing cage. The spiral stirrups can form a circumferential constraint on the longitudinal reinforcing bars from the side, essentially putting a hoop around the reinforcing cage, thereby increasing the lateral restraint force of the reinforcing cage.

[0013] When disconnecting the connection between the first section of the reinforcing cage and the second section of the reinforcing cage, the threaded sleeve can be left on the longitudinal reinforcing bars of the second section of the reinforcing cage, or the threaded sleeve can be completely removed and placed separately.

[0014] Preferably, in step S12, when disconnecting the temporary connection between the first section of the reinforcing cage and the second section of the reinforcing cage, a threaded sleeve is left on the longitudinal reinforcing bar of the second section of the reinforcing cage, and a protective sleeve is used to protect the exposed threaded ends on the longitudinal reinforcing bar of the first section of the reinforcing cage.

[0015] In this design, the threaded sleeve is left on the longitudinal reinforcing bars of the second section of the reinforcing cage. This serves two purposes: firstly, it effectively protects the threaded ends of the reinforcing bars, preventing damage from impacts and abrasions during subsequent construction or storage; secondly, it reduces the need for reinstalling the threaded sleeve during installation, saving construction time and improving efficiency. The protective sleeve also effectively protects the exposed threaded ends of the longitudinal reinforcing bars in the first section of the reinforcing cage, preventing damage from impacts and abrasions during subsequent construction or storage.

[0016] Both the first mark and the second mark can be paint marks, colored tape marks, or rope marks.

[0017] Preferably, in step S12, both the first mark and the second mark are red paint marks. Compared to colored tape marks or rope marks, red paint has stronger adhesion to longitudinal reinforcing bars and is less likely to peel off under normal use conditions and a certain degree of external force. Moreover, red itself has high visual recognition, making it easy for relevant personnel to quickly find and identify these marks.

[0018] Preferably, in step S1, after the first section of the reinforcing cage and the second section of the reinforcing cage are manufactured, the first section of the reinforcing cage and the second section of the reinforcing cage are transferred to the construction site of the cast-in-place pile and temporarily stored on the reinforcing cage support; the reinforcing cage support includes a base and several storage racks, each of the four corners of the base is provided with a support leg, the support leg can move up and down relative to the base, the bottom of the support leg is provided with a pointed tip, the pointed tip is used to embed into the soil, several storage racks are arranged on the top surface of the base, several storage racks are arranged along the length direction of the base, and the storage racks are provided with grooves, the grooves are used to place the first section of the reinforcing cage or the second section of the reinforcing cage.

[0019] In this design, the rebar cage support, through its legs that can move vertically relative to the base, overcomes uneven ground conditions at the construction site. The base can be adjusted to a level position, thereby reducing the risk of twisting and bending deformation of the rebar cage after it is placed in the groove of the storage rack, ensuring the quality of the rebar cage. Severe deformation of the rebar cage may increase the gap between the longitudinal reinforcing bars during the splicing of two sections, thus affecting the overall integrity of the rebar cage.

[0020] The base, serving as the core framework of the entire rebar cage, provides a stable support platform for the storage racks and reliable attachment points for the outriggers, allowing them to be securely mounted on the base. The outriggers support the entire support structure above the soil. The pointed tips of the outriggers are designed to easily embed into the soil, ensuring stable support and fixation, providing a stable foundation for the entire support structure. The outriggers are vertically movable relative to the base. This feature allows for flexible adjustment of the height of each outrigger according to the actual elevation of the construction site, ensuring the base is level and effectively preventing tilting due to varying outrigger positions. The storage racks, mounted on the base, are specifically designed to hold the rebar cage, providing a stable and organized storage space. Two identical supports can be placed side-by-side with intervals, allowing each end of the rebar cage to be placed in one of the racks.

[0021] The leg can move up and down relative to the base in one of the following ways: multiple first fixing holes are provided in the height direction of the leg, and a second fixing hole is provided on the side of the base. The second fixing hole is connected to different first fixing holes by bolts, thereby achieving the effect of the leg moving up and down relative to the base; or a vertical sleeve is installed on the base, the leg is placed inside the sleeve, so that the leg can move up and down along the axial direction of the sleeve, and then the leg is fixed by bolts or clamps.

[0022] Preferably, in step S1, the base has sleeves at all four corners, the support legs are fitted in the sleeves, the support legs can move up and down along the axial direction of the sleeves, the outer wall of the sleeves has screw holes, the support legs have vertical grooves, the screw holes have bolts, the bolts pass through the screw holes and are inserted into the vertical grooves, and the relative position of the support legs and the sleeves can be locked by tightening the bolts.

[0023] In this design, the support leg can move up and down along the axial direction of the sleeve to achieve the function of moving the support leg up and down relative to the base. The screw hole provides a fixed installation position for the bolt, and the friction and compressive force generated by the bolt during tightening can effectively lock the support leg, preventing it from moving uncontrollably. The support leg is provided with a vertical groove, and the bolt can be inserted into the vertical groove. This design restricts the horizontal rotation of the support leg on the one hand, and on the other hand, since the vertical groove has a certain length range in the axial direction, the support leg can move up and down within this length range when the bolt is not tightened, preventing the support leg from slipping out of the sleeve.

[0024] The screwing operation of the threaded sleeve can be performed using a manual wrench, an electric wrench, or an electric pipe wrench.

[0025] Preferably, in steps S3 and S4, the threaded sleeve is turned using an electric pipe wrench.

[0026] In this solution, the electric pipe wrench can more easily complete the turning action of the threaded sleeve, thereby effectively improving construction efficiency.

[0027] Preferably, in step S4, after the longitudinal reinforcing bars between the first and second reinforcing cage sections are connected using threaded sleeves, a thread-locking agent is applied to the connection between the threaded sleeve and the longitudinal reinforcing bars. In this scheme, the thread-locking agent strengthens the connection between the threaded sleeve and the longitudinal reinforcing bars. Vibration, external impact, and other factors may cause relative rotation between the threaded sleeve and the longitudinal reinforcing bars. Once this relative rotation occurs, it may lead to connection failure or separation between the two longitudinal reinforcing bars. Applying the thread-locking agent effectively avoids such problems, ensuring the stability and reliability of the reinforcing cage connection. The thread-locking agent is a single-component, anaerobic sealant. The thread-locking agent cures under conditions of air isolation and the presence of metal ions. When the thread-locking agent is applied to the threaded connection, air in the gaps is eliminated. Under the catalytic action of the metal threads, the adhesive gradually cures, filling the tiny gaps between the threads to form a tough thermosetting plastic, thereby tightly locking the threads together and preventing loosening.

[0028] The first section of the reinforcing cage can be supported on the casing by passing a steel pipe through it and supporting it at the top of the casing; or by installing a movable hook on the inner wall of the casing and hanging the first section of the reinforcing cage on the movable hook.

[0029] Preferably, in step S2, a steel pipe is used to support the first section of the reinforcing cage on the casing. The steel pipe passes through the first section of the reinforcing cage, and both ends of the steel pipe are supported on the casing. Compared to using movable hooks to support the first section of the reinforcing cage, using the steel pipe for support is more convenient and faster in operation.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a method for extending a pile foundation reinforcement cage. By setting positioning marks between the first and second sections of the reinforcement cage, the correspondence between the longitudinal reinforcing bars of the two sections can be quickly confirmed during the installation phase, ensuring consistency with the correspondence set during the fabrication phase. This marking method, along with the practice of first butt-joining the closest set of longitudinal reinforcing bars, allows for overall alignment of the ends of the upper and lower reinforcement cages. This effectively reduces the gap at the joint of the longitudinal reinforcing bars, solving the problem of large gaps at the joints of some longitudinal reinforcing bars during the splicing of the upper and lower sections, thereby improving the overall integrity and joint quality of the reinforcement cage. Attached Figure Description

[0031] Figure 1 This is a first schematic diagram of step S1 in Example 1.

[0032] Figure 2 This is a second schematic diagram of step S1 in Example 1.

[0033] Figure 3 This is the first schematic diagram of step S3 in Example 1.

[0034] Figure 4 This is a second schematic diagram of step S3 in Example 1.

[0035] Figure 5 This is a structural schematic diagram of a steel cage support.

[0036] Figure 6 This is a front view of the steel cage support.

[0037] Marked in the image: 1-First section of the steel cage, 101 - First Mark, 2-Second section of the steel cage, 201-Second Mark, 3-Support frame, 4-Casing, 5-Steel pipe, 6-Base, 7-Casing, 8-legs 801 - Tip, 802 - Vertical groove 9- Bolt, 10-Storage rack. Detailed Implementation

[0038] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0039] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer," etc., used in the description of specific embodiments of the present invention to indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0040] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0041] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0042] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0043] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to connection methods commonly used in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0044] Example 1 like Figures 1 to 4 As shown, a method for extending a pile foundation reinforcement cage includes the following steps: S1: Construct a second section of steel cage 2 based on the first section of steel cage 1, and set positioning marks between the first section of steel cage 1 and the second section of steel cage 2.

[0045] S2: Transfer the first section of the reinforcing cage 1 and support it on the casing 4, hoist the second section of the reinforcing cage 2 above the first section of the reinforcing cage 1, and align the second section of the reinforcing cage 2 with the first section of the reinforcing cage 1 using the positioning marks.

[0046] Specifically, the first section of the reinforcing cage 1 and the second section of the reinforcing cage 2 are transferred to the construction site. The first section of the reinforcing cage 1 is placed into the casing 4 by hoisting and supported on the casing 4. The first section of the reinforcing cage 1 is placed vertically in the casing 4. The second section of the reinforcing cage 2 is hoisted vertically using a crane hook and wire rope.

[0047] S3: Use a threaded sleeve to connect the group of longitudinal reinforcing bars that are closest to each other between the first section of the reinforcing cage 1 and the second section of the reinforcing cage 2, and designate the group of longitudinal reinforcing bars that are closest to each other as the first group of longitudinal reinforcing bars. Designate the other group of longitudinal reinforcing bars that is in a relative position to the first group of longitudinal reinforcing bars as the second group. Adjust the second section of the reinforcing cage 2 around the connection position of the first group of longitudinal reinforcing bars so that the two longitudinal reinforcing bars in the second group are close to each other. Then use a threaded sleeve to connect the second group of longitudinal reinforcing bars.

[0048] S4: Referring to step S3, continue to find the group of longitudinal reinforcing bars that are not connected and are closest to each other between the first section of steel cage 1 and the second section of steel cage 2, and connect the group of longitudinal reinforcing bars and the longitudinal reinforcing bars that are in the opposite position to the group of longitudinal reinforcing bars using threaded sleeves. Repeat step S4 until all the longitudinal reinforcing bars of the first section of steel cage 1 and the second section of steel cage 2 are connected.

[0049] Specifically, after the second section of the reinforcing cage 2 is connected to the first section of the reinforcing cage 1, the second section of the reinforcing cage 2 and the first section of the reinforcing cage 1 are lowered into the pile hole as a whole, so that the second section of the reinforcing cage 2 is lowered to the original position of the first section of the reinforcing cage 1 and supported on the casing 4. Next, the next section of the reinforcing cage is hoisted and connected to the second section of the reinforcing cage 2 to achieve the extension. This process is repeated sequentially to complete the extension work of the subsequent reinforcing cages, ultimately achieving the extension operation of the entire cast-in-place pile reinforcing cage.

[0050] In an optional implementation, step S1 may include the following steps: S11: Place the first section of the steel cage 1 horizontally on the support frame 3, and temporarily connect a new batch of longitudinal reinforcing bars to the longitudinal reinforcing bars of the first section of the steel cage 1 through threaded sleeves, thereby completing the fabrication of the second section of the steel cage 2.

[0051] Specifically, before step S1, external threads need to be cut onto the ends of the new batch of longitudinal reinforcing bars and the ends of the existing longitudinal reinforcing bars on the first section of the reinforcing cage 1. When temporarily connecting two longitudinal reinforcing bars, the operation steps are as follows: First, clean the threaded ends of the longitudinal reinforcing bars to remove oil and impurities; then, fully screw the threaded sleeve onto one of the longitudinal reinforcing bars, ensuring that the end face of the longitudinal reinforcing bar is exposed above or flush with the end face of the threaded sleeve; next, press the end face of the other longitudinal reinforcing bar against the end face of the longitudinal reinforcing bar with the threaded sleeve already in place; finally, rotate the threaded sleeve until the midpoint of the threaded sleeve is exactly at the point where the two longitudinal reinforcing bars meet.

[0052] S12: Set a first mark 101 and a second mark 201 on one of the sets of longitudinal reinforcing bars that are temporarily connected to each other on the first section of the steel cage 1 and the second section of the steel cage 2, and disconnect the temporary connection between the first section of the steel cage 1 and the second section of the steel cage 2.

[0053] Specifically, after disconnecting the temporary connection between the first section of the steel cage 1 and the second section of the steel cage 2, the first section of the steel cage 1 can be hoisted away from the support frame 3 and temporarily stored in another location. Then, the second section of the steel cage 2 is hoisted to the original position of the first section of the steel cage 1. At this time, the second section of the steel cage 2 plays the same role as the first section of the steel cage 1, and the subsequent steel cages are made in sequence.

[0054] Steps S11 and S12 can be carried out in the factory or at the construction site of the cast-in-place pile.

[0055] In an optional embodiment, in step S11, after temporarily connecting a new batch of longitudinal reinforcing bars to the longitudinal reinforcing bars of the first section of the reinforcing cage 1 through a threaded sleeve, a circumferential positioning bar can be placed in the middle of the new batch of longitudinal reinforcing bars, and the circumferential positioning bar is welded to the new batch of longitudinal reinforcing bars. Spiral hoops are wrapped around the outside of the new batch of longitudinal reinforcing bars and welded, thereby completing the fabrication of the second section of the reinforcing cage 2.

[0056] In an optional implementation, in step S12, when disconnecting the temporary connection between the first section of the reinforcing cage 1 and the second section of the reinforcing cage 2, a threaded sleeve can be left on the longitudinal reinforcing bars of the second section of the reinforcing cage 2, and a protective sleeve can be used to protect the exposed threaded ends on the longitudinal reinforcing bars of the first section of the reinforcing cage 1. Specifically, the protective sleeve is made of plastic.

[0057] In an optional implementation, in step S12, the protective sleeve may be provided with an internal thread that matches the threaded end. In this solution, because the protective sleeve has an internal thread that matches the threaded end, when the protective sleeve and the threaded end are connected, they can be tightly fitted together through threaded engagement, thereby enhancing the connection stability between the protective sleeve and the threaded end and effectively reducing the possibility of detachment due to external impacts, vibrations, or other unexpected situations.

[0058] In an optional implementation, in step S12, both the first mark 101 and the second mark 201 can be red paint marks. Specifically, the red paint marks can be applied using a paintbrush or by spraying. The lengths of the first mark 101 and the second mark 201 can be 10cm-15cm.

[0059] In an optional embodiment, in step S1, after the first section of the reinforcing cage 1 and the second section of the reinforcing cage 2 are manufactured, the first section of the reinforcing cage 1 and the second section of the reinforcing cage 2 can be transferred to the cast-in-place pile construction site and temporarily stored on a reinforcing cage support; the reinforcing cage support includes a base 6 and several storage racks 10, such as... Figure 5 and Figure 6 As shown, the base 6 is provided with legs 8 at each of its four corners. The legs 8 can move up and down relative to the base 6. The bottom of the legs 8 is provided with a pointed tip 801, which is used to embed into the soil. Several storage racks 10 are provided on the top surface of the base 6. The storage racks 10 are arranged along the length of the base 6. The storage racks 10 are provided with grooves, which are used to place the first section of the steel cage 1 or the second section of the steel cage 2.

[0060] Specifically, the base 6 can be a cuboid frame structure, and the number of storage racks 10 can be 2, 3, or 4. The extension direction of the groove of the storage rack 10 is perpendicular to the length direction of the base 6. The cross-sectional shape of the groove of the storage rack 10 can be a semi-circle or an inverted isosceles trapezoid, and the cross-sectional shape and size of the groove of the storage rack 10 are determined according to the cross-sectional dimensions of the first section of the reinforcing cage 1 and the second section of the reinforcing cage 2.

[0061] In an optional embodiment, in step S1, each of the four corners of the base 6 can be provided with a sleeve 7, and the support leg 8 is sleeved in the sleeve 7. The support leg 8 can move up and down along the axial direction of the sleeve 7. The outer wall of the sleeve 7 is provided with a screw hole, and the support leg 8 is provided with a vertical groove 802. A bolt 9 is provided at the screw hole. The bolt 9 passes through the screw hole and is inserted into the vertical groove 802. By tightening the bolt 9, the relative position of the support leg 8 and the sleeve 7 can be locked.

[0062] Specifically, the cross-section of the cavity inside the sleeve 7 is square, and the cross-section of the support leg 8 is also a square corresponding to the cross-section of the cavity. The wall thickness of the sleeve 7 can be 8mm-14mm. The sleeve 7 is connected to the base 6 by welding. The top of the support leg 8 may be provided with an end plate, the size of which is larger than the cross-sectional size of the support leg 8.

[0063] In an optional implementation, in steps S3 and S4, the threaded sleeve can be tightened using an electric pipe wrench. Specifically, the electric pipe wrench is equipped with a rechargeable battery. Powered by a motor or electric device, and with its adjustable jaw design, the electric pipe wrench can accommodate pipes or threaded sleeves of different diameters, enabling quick and efficient tightening or loosening operations.

[0064] In an optional implementation, in step S4, after each group of longitudinal reinforcing bars between the first section of the reinforcing cage 1 and the second section of the reinforcing cage 2 is connected using a threaded sleeve, a thread-locking agent can be applied to the connection between the threaded sleeve and the longitudinal reinforcing bar.

[0065] In an optional embodiment, in step S2, a steel pipe 5 can be used to support the first section of the reinforcing cage 1 on the casing 4. The steel pipe 5 passes through the first section of the reinforcing cage 1, and both ends of the steel pipe 5 are supported on the casing 4. Specifically, the circumferential positioning reinforcing bars or spiral stirrups of the first section of the reinforcing cage 1 are supported on the steel pipe 5. The diameter of the steel pipe 5 can be 80mm-90mm, and the wall thickness can be 4mm-5mm. There can be two steel pipes 5, arranged in parallel and passing through different positions on the upper part of the first section of the reinforcing cage 1. Anti-slip rubber pads are placed on the supporting surfaces of the steel pipe 5 and the casing 4.

[0066] In an optional implementation, step S4 can be replaced by: when connecting the remaining groups of longitudinal reinforcing bars, the connection of the remaining groups of longitudinal reinforcing bars can be completed sequentially along the circumference of the reinforcing cage. Alternatively, the connection of the remaining groups of longitudinal reinforcing bars can be carried out alternately on both sides of the line connecting the first group of longitudinal reinforcing bars and the second group of longitudinal reinforcing bars as the axis of symmetry. This alternating connection sequence along the left and right sides of the axis of symmetry can, to some extent, disperse the stress generated during the connection process, avoid excessive stress concentration in local areas, and help improve the overall performance of the reinforcing cage after connection.

[0067] In an optional implementation, step S4 can also be replaced by: for the remaining groups of longitudinal reinforcing bars, the connection can be performed in the following order: first, connect the two groups of longitudinal reinforcing bars that are at a 90° angle to the first and second groups; then, connect the four groups of longitudinal reinforcing bars that are at a 45° angle to the first four groups; finally, complete the connection of the remaining groups of longitudinal reinforcing bars in a clockwise or counterclockwise direction.

[0068] In an optional embodiment, during step S2, when hoisting the second section of the reinforcing cage 2, a guide rope can be connected to the second section of the reinforcing cage 2. The second section of the reinforcing cage 2 can be rotated using the guide rope to facilitate the alignment of the second mark 201 with the first mark 101. Specifically, there are two guide ropes, connected to opposite sides of the second section of the reinforcing cage 2. The guide ropes can be hemp rope or nylon rope, with a diameter of 8mm-12mm. In this scheme, the guide ropes provide the operator with a convenient point of leverage, making the rotation of the second section of the reinforcing cage 2 easier and more flexible, significantly improving the efficiency of the alignment operation, and enabling the rapid completion of the alignment operation between the second mark 201 and the first mark 101.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for extending a pile foundation reinforcement cage, characterized in that, Includes the following steps: S1: Based on the first section of the steel cage (1), make the second section of the steel cage (2) and set positioning marks between the first section of the steel cage (1) and the second section of the steel cage (2); S2: Transfer the first section of the steel cage (1) and support it on the casing (4), hoist the second section of the steel cage (2) above the first section of the steel cage (1), and align the second section of the steel cage (2) with the first section of the steel cage (1) using the positioning mark; S3: Use a threaded sleeve to connect the set of longitudinal reinforcing bars that are closest to each other between the first section of the steel cage (1) and the second section of the steel cage (2), and take the set of longitudinal reinforcing bars that are closest to each other as the first set of longitudinal reinforcing bars. Take another set of longitudinal reinforcing bars that are in a relative position to the first set of longitudinal reinforcing bars as the second set. Adjust the second section of the steel cage (2) around the connection position of the first set of longitudinal reinforcing bars so that the two longitudinal reinforcing bars in the second set are close to each other. Then use a threaded sleeve to connect the second set of longitudinal reinforcing bars. S4: Referring to step S3, continue to find the group of longitudinal reinforcing bars that are not connected and are closest to each other between the first section of the steel cage (1) and the second section of the steel cage (2), and connect the group of longitudinal reinforcing bars and the longitudinal reinforcing bars that are in the opposite position to the group of longitudinal reinforcing bars using threaded sleeves. Repeat step S4 until all the longitudinal reinforcing bars of the first section of the steel cage (1) and the second section of the steel cage (2) are connected.

2. The method for extending a pile foundation reinforcement cage according to claim 1, characterized in that, Step S1 includes the following steps: S11: Place the first section of the steel cage (1) horizontally on the support frame (3), and temporarily connect a new batch of longitudinal reinforcing bars to the longitudinal reinforcing bars of the first section of the steel cage (1) through threaded sleeves, thereby completing the fabrication of the second section of the steel cage (2). S12: Set a first mark (101) and a second mark (201) on one of the sets of longitudinal reinforcing bars that are temporarily connected to each other on the first section of the reinforcing cage (1) and the second section of the reinforcing cage (2), and disconnect the temporary connection between the first section of the reinforcing cage (1) and the second section of the reinforcing cage (2).

3. The method for extending a pile foundation reinforcement cage according to claim 2, characterized in that, In step S11, after temporarily connecting a new batch of longitudinal reinforcing bars to the longitudinal reinforcing bars of the first section of the reinforcing cage (1) through a threaded sleeve, a circumferential positioning bar is placed in the middle of the new batch of longitudinal reinforcing bars, and the circumferential positioning bar is welded to the new batch of longitudinal reinforcing bars. Spiral hoops are wrapped around the outside of the new batch of longitudinal reinforcing bars and welded, thereby completing the fabrication of the second section of the reinforcing cage (2).

4. The method for extending a pile foundation reinforcement cage according to claim 2, characterized in that, In step S12, when disconnecting the temporary connection between the first section of the reinforcing cage (1) and the second section of the reinforcing cage (2), the threaded sleeve is left on the longitudinal reinforcing bars of the second section of the reinforcing cage (2), and the exposed threaded ends on the longitudinal reinforcing bars of the first section of the reinforcing cage (1) are protected by a protective sleeve.

5. The method for extending a pile foundation reinforcement cage according to claim 2, characterized in that, In step S12, both the first mark (101) and the second mark (201) are red paint marks.

6. A method for extending a pile foundation reinforcement cage according to any one of claims 1-5, characterized in that, In step S1, after the first section of the reinforcing cage (1) and the second section of the reinforcing cage (2) are made, the first section of the reinforcing cage (1) and the second section of the reinforcing cage (2) are transferred to the construction site of the cast-in-place pile and temporarily stored on the reinforcing cage support. The reinforcing cage support includes a base (6) and several storage racks (10). The four corners of the base (6) are provided with legs (8). The legs (8) can move up and down relative to the base (6). The bottom of the legs (8) is provided with a tip (801). The tip (801) is used to embed into the soil. Several storage racks (10) are set on the top surface of the base (6). Several storage racks (10) are arranged along the length direction of the base (6). The storage racks (10) are provided with grooves. The grooves are used to place the first section of the reinforcing cage (1) or the second section of the reinforcing cage (2).

7. The method for extending a pile foundation reinforcement cage according to claim 6, characterized in that, In step S1, the base (6) is provided with sleeves (7) at all four corners, the support leg (8) is sleeved in the sleeve (7), the support leg (8) can move up and down along the axial direction of the sleeve (7), the outer wall of the sleeve (7) is provided with screw holes, the support leg (8) is provided with vertical grooves (802), the screw holes are provided with bolts (9), the bolts (9) pass through the screw holes and are inserted into the vertical grooves (802), and the relative position of the support leg (8) and the sleeve (7) can be locked by tightening the bolts (9).

8. The method for extending a pile foundation reinforcement cage according to claim 6, characterized in that, In steps S3 and S4, the threaded sleeve is tightened using an electric pipe wrench.

9. The method for extending a pile foundation reinforcement cage according to claim 6, characterized in that, In step S4, after the longitudinal reinforcing bars between the first section of the reinforcing cage (1) and the second section of the reinforcing cage (2) are connected using threaded sleeves, thread locking agent is applied to the connection between the threaded sleeve and the longitudinal reinforcing bars.

10. The method for extending a pile foundation reinforcement cage according to claim 6, characterized in that, In step S2, the first section of the reinforcing cage (1) is supported on the casing (4) using a steel pipe (5). The steel pipe (5) passes through the first section of the reinforcing cage (1), and both ends of the steel pipe (5) are supported on the casing (4).

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