A root key jacking device and root key jacking construction method

Abstract

The application discloses a root key jacking device and a root key jacking construction method, and relates to the technical field of bridge construction. The jacking counterforce assembly is arranged on the hoisting platform, and comprises a counterforce seat and a jacking slide, wherein the counterforce seat and the jacking slide are integrated, and one end of the jacking slide is provided with an opening. The jacking assembly is arranged in the jacking slide, and can be locked or unlocked with the jacking slide. When the jacking assembly is locked with the jacking slide, the counterforce seat can provide counterforce support for the jacking action of the jacking assembly. When the jacking assembly is unlocked with the jacking slide, the jacking assembly can slide along the jacking slide. The root key jacking device realizes the automatic underwater jacking of the super-long root key under the condition that the inner cavity space of the large-diameter hollow bored pile is narrow through the cooperation of the jacking slide and the jacking counterforce assembly, and ensures the construction quality of the root key.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, specifically to a key jacking device and a key jacking construction method. Background Technology

[0002] Keyed piles are a type of biomimetic pile foundation formed by jacking precast key anchors after the reinforcing cage is lowered to the design elevation. Their unique structural form will bring a new round of revolution and progress to pile foundation structures. A specialized jacking device is used to push the key anchors into the surrounding soil, utilizing the soil's grip on the key anchors to increase the foundation's stability and bearing capacity while reducing its self-weight. In areas with deep overburden, soft soil, and soft rock foundations, jacking key anchors can fully mobilize the bearing capacity of the surrounding soil, thereby increasing the foundation's bearing capacity, reducing settlement, and consequently shortening the pile length or reducing the foundation's size. Therefore, the larger the diameter of the keyed pile, the longer the extension distance of the keyed pile, the more key anchors can be installed, the greater the bearing capacity of the surrounding soil utilized, and the more fully the advantages of keyed piles can be utilized.

[0003] In related technologies, the jacking method is mostly radial jacking at multiple points simultaneously. However, due to the complexity of the jacking device construction and the limited space inside the pile hole, practitioners cannot use longer root keys for jacking construction. Summary of the Invention

[0004] To address the problem in existing technologies where the complexity of jacking device construction and the limited space within the pile hole prevent operators from using longer root keys for jacking operations, this application provides a root key jacking device, comprising: a hoisting platform, a jacking reaction assembly, and a jacking assembly; wherein,

[0005] The jacking reaction force assembly is installed on the hoisting platform. The jacking reaction force assembly includes a reaction force seat and a jacking slide. The reaction force seat and the jacking slide are integrated. One end of the jacking slide is provided with an opening.

[0006] A jacking assembly, disposed within the jacking slide, is lockable or unlockable from the jacking slide. The jacking assembly is used for unilateral jacking of the jacking root key located within the jacking slide underwater.

[0007] When the jacking assembly is locked to the jacking slide, the reaction seat can provide reaction force support for the jacking action of the jacking assembly. When the jacking assembly is unlocked from the jacking slide, the jacking assembly can slide along the jacking slide.

[0008] In some embodiments, the jacking assembly includes:

[0009] A jacking jack is disposed in the jacking slide, and the jacking jack can slide along the jacking slide;

[0010] A locking part is provided on the jacking jack, and the locking part is used to lock with the jacking slide to restrict the sliding of the jacking jack in the jacking slide.

[0011] In some embodiments, a plurality of reserved holes are provided on the two opposite sidewalls of the jacking slide, the plurality of reserved holes are spaced apart along the length direction of the jacking slide, and the reserved holes on the two sidewalls are located in pairs corresponding to each other;

[0012] The locking part includes at least two locking jacks, which are symmetrically arranged around the center of the jacking jack. The actuating end of the locking jack can extend into the reserved hole to lock the jacking jack, or retract to unlock the jacking jack.

[0013] In some embodiments, the spacing between two adjacent reserved holes on the same sidewall of the jacking slide is equal to the jacking stroke of one jacking end of the jacking jack.

[0014] In some embodiments, the jacking assembly further includes:

[0015] A drive unit is assembled on the jacking root key located in the jacking slide, and the drive unit is used to drive the jacking jack, which is in the unlocked state, to move toward the jacking root key.

[0016] In some embodiments, the drive unit includes a magnet located at the end of the jacking root key away from the opening, the magnet being used to attract the jacking jack to move toward the jacking root key.

[0017] On the other hand, this application provides a root key jacking construction method utilizing the above-mentioned root key jacking device, which includes the following steps:

[0018] Step S1. Hole the hollow pile in stages and reserve multiple jacking slots on the side wall of the hollow pile;

[0019] Step S2. Set up a hollow pile inner template inside the hollow pile and cast the hollow pile underwater;

[0020] Step S3. Use a lifting device to lower the hoisting platform into the inner cavity of the hollow pile, align the jacking root key in the jacking slide with the jacking slot, and simultaneously press the reaction seat against the inner surface of the hollow pile.

[0021] Step S4. Control the jacking component to jack the jacking root key until the jacking root key moves to a preset position.

[0022] In some embodiments, controlling the jacking assembly to advance the jacking root key includes:

[0023] Lock the jacking assembly to the jacking slide, and drive the jacking assembly to push the jacking root by one stroke;

[0024] Unlock the jacking assembly and drive it to move one stroke toward the opening.

[0025] In some embodiments, locking the jacking assembly to the jacking slide includes:

[0026] The actuator of the locking jack of the jacking assembly extends out and into the reserved hole of the jacking slide, locking the actuator of the locking jack.

[0027] In some embodiments, driving the jacking assembly to move one stroke toward the opening includes:

[0028] The jacking jack is attracted by the magnet of the jacking assembly until it moves a certain distance, and then the locking jack is used to lock the jacking jack.

[0029] Compared with the prior art, the root key jacking device of the present invention achieves automatic underwater jacking of ultra-long root keys in the case of narrow internal space of large-diameter hollow drilled piles through the cooperation of jacking slide and jacking reaction component, thus ensuring the construction quality of root keys. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a front view of the root key jacking device in an embodiment of the present invention;

[0032] Figure 2 This is a top view of the root key jacking device in an embodiment of the present invention;

[0033] Figure 3 This is a left view of the root key jacking device in an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the preparation state for the jacking construction in an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the jacking process in an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram showing the completion of the hollow pile jacking construction in an embodiment of the present invention.

[0037] In the diagram: 1. Lifting platform; 2. Jacking reaction assembly; 21. Jacking slide; 211. Reserved hole; 22. Opening; 23. Reaction seat; 3. Jacking assembly; 31. Jacking jack; 32. Locking part; 321. Locking jack; 33. Drive part; 4. Jacking root key; 5. Hollow pile; 51. Jacking slot; 52. Hollow pile inner formwork. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Addressing the problem in the prior art where the complexity of the jacking device construction and the limited space within the pile hole prevent workers from performing jacking construction on longer root keys, such as... Figure 1 , Figure 2 and Figure 3 As shown, this application provides a root key jacking device, including: a hoisting platform 1, a jacking reaction force assembly 2, and a jacking assembly 3; wherein,

[0040] A jacking reaction force assembly 2, mounted on the hoisting platform 1, includes a reaction force seat 23 and a jacking slide 21. The reaction force seat 23 and the jacking slide 21 are integrally connected, and one end of the jacking slide 21 has an opening 22. A jacking assembly 3, mounted within the jacking slide 21, is lockable or unlockable from the jacking slide 21. The jacking assembly 3 is used for unilateral jacking of the jacking root key 4 located in the jacking slide 21 underwater.

[0041] When the jacking component 3 is locked to the jacking slide 21, the reaction seat 23 can provide reaction force support for the jacking action of the jacking component 3. When the jacking component 3 is unlocked from the jacking slide 21, the jacking component 3 can slide along the jacking slide 21.

[0042] Understandably, the reaction seat 23 is used to abut against the pre-cast hollow pile inner template 52. In this way, when the jacking assembly 3 is locked with the jacking slide 21 in the reaction seat 23, and the jacking assembly 3 jacks the jacking root key 4, the reaction seat 23 can provide reaction support for the jacking assembly 3 because it is abutting against the hollow pile inner template 52.

[0043] Specifically, the jacking assembly 3 includes: a jacking jack 31 and a locking part 32; wherein,

[0044] A jacking jack 31 is disposed in the jacking slide 21, and the jacking jack 31 can slide along the jacking slide 21. A locking part 32 is disposed on the jacking jack 31, and the locking part 32 is used to lock with the jacking slide 21 to restrict the sliding of the jacking jack 31 in the jacking slide 21.

[0045] It is understandable that the execution end of the jacking jack 31 faces the jacking root key 4, and the locking part 32 is located on the side of the jacking jack 31, so the two do not interfere with each other.

[0046] In some specific embodiments, the jacking slide 21 has a U-shaped cross-section in its axial direction. The jacking slide 21 includes two side walls and a bottom, with the opening facing upwards. The length of the jacking slide 21 is greater than the combined length of the jacking jack 31 and the jacking root key 4. The jacking slide 21 is used to accommodate the jacking assembly 3 and the jacking root key 4. One end of the reaction seat 23 is flat and connected to the jacking slide 21, while the other end is an arc-shaped surface adapted to the inner cavity of the hollow pile, used to abut against the inner template 52 of the hollow pile.

[0047] In some preferred embodiments, the side wall of the jacking slide 21 is provided with a plurality of reserved holes 211, which are spaced apart along the length of the jacking slide 21. The locking part 32 can lock the jacking jack 31 by engaging with the reserved holes 211 to prevent the jacking jack 31 from moving relative to the jacking slide 21.

[0048] Optionally, the locking part 32 includes at least one locking jack 321, the execution end of which can extend into the reserved hole 211 to lock the jack 31, or retract to unlock the jack 31.

[0049] Preferably, the distance between two adjacent reserved holes 211 on the same side wall of the jacking slide 21 is equal to the jacking stroke of one jacking end of the jacking jack 31.

[0050] In this way, after the jacking 31 pushes the jacking root key 4 forward by one stroke, the actuator retracts. It is only necessary to drive the jacking 31 to move towards the jacking root key 4 in the jacking slide 21 and abut against the tail of the jacking root key 4, so that the actuator of the locking jack 321 can be aligned with the next set of reserved holes 211.

[0051] In some embodiments, to accommodate longer jacking distances, the jacking slide 21 has multiple pre-drilled holes 211 on its two opposite sidewalls, with each pair of pre-drilled holes 211 corresponding to the other sidewall. The locking part 32 includes at least two locking jacks 321, which are symmetrically arranged around the center of the jacking jack 31.

[0052] When locking is required, the two locking jacks 321 extend into the two pre-drilled holes 211 to limit the locking jacks 321.

[0053] In some preferred embodiments, the jacking assembly 3 further includes a drive unit 33, which is mounted on the jacking root key 4 located in the jacking slide 21. The drive unit 33 is used to drive the jacking jack 31, which is in an unlocked state, to move toward the jacking root key 4.

[0054] Optionally, the drive unit 33 includes a magnet located at the end of the jacking root key 4 away from the opening 22. The magnet attracts the jacking jack 31 to move towards the jacking root key 4. In this way, the jacking assembly 3 adheres to the tail of the jacking root key 4 and slides along the jacking slide rail 21 with the jacking root key 4 as support.

[0055] On the other hand, this application also provides a key jacking construction method using the aforementioned key jacking device. It should be noted that the jacking construction in this application is all carried out underwater, thus requiring the use of the aforementioned key jacking device. The construction method includes the following steps:

[0056] S1. Holes are drilled in stages for the hollow pile 5, and multiple jacking slots 51 are reserved on the side wall of the hollow pile 5.

[0057] S2. Subsequently, the hollow pile body is poured into the hollow pile 5.

[0058] Specifically, under mud slurry wall protection conditions, large-diameter bored piles are drilled in stages. At the same time, the hollow pile reinforcement cage is manufactured in sections in the factory, and the jacking key 4 jacking slot is reserved during the manufacturing process; then the reinforcement cage is lowered and the bottom sealing concrete is poured underwater at the bottom of the pile hole; finally, the hollow pile inner formwork is installed underwater and the hollow pile body concrete is poured.

[0059] S3. Use a lifting device to lower the hoisting platform 1 into the hollow pile 5, and align the jacking root key 4 in the jacking slide 21 with the jacking slot 51, while simultaneously pressing the reaction seat 23 against the inner template 52 of the hollow pile.

[0060] S4. Control the jacking component 3 to jack the jacking root key 4 until the jacking root key 4 moves to a preset position.

[0061] Specifically, the actuator end of the locking jack 321 of the jacking assembly 3 extends out and enters the reserved hole 211 of the jacking slide 21, locking the actuator end of the locking jack 321. At this time, the extension of the jacking jack 31 causes the jacking root key 4 to move one stroke.

[0062] Then, the locking jack 321 is retracted to unlock the jacking jack 31. Subsequently, the jacking jack 31 is attracted by the magnet of the jacking assembly 3 until it has moved one stroke distance. Then, the locking jack 321 is used to lock the jacking jack 31 again, and the jacking jack 31 is used to perform jacking operations on the jacking root key, causing it to move one stroke distance within the jacking slide 21.

[0063] like Figure 4 and Figure 5 As shown, repeat the locking, unlocking and pushing steps to push the root key 4 until the root key 4 moves to the preset position.

[0064] It is understandable that in the construction method of this application, the pile body construction precedes the key jacking construction. This allows the key jacking device to utilize the hollow pile body, which has been constructed first, as the jacking reaction force device for the key jacking device. In related technologies, the key 4 is often jacked first, followed by the hollow pile construction. When jacking small-sized key 4s, a counter-jacking method can be used, with two small-sized key 4s providing mutual reaction force support. However, for extra-long key 4s (i.e., key 4s whose length-to-diameter ratio of the hollow pile cavity is greater than 50%), the limited space within the hollow pile cavity makes it difficult for professionals to use a counter-jacking method to jack the extra-long key 4s.

[0065] In the construction method of this application, the jacking construction is carried out on the extra-long jacking root key 4. Hollow piles are constructed first, so that the inner formwork 52 of the hollow pile provides a reaction support point for the unilateral jacking of the extra-long jacking root key 4. This allows the jacking device of this application to carry out the jacking construction on the extra-long jacking root key 4 even in environments with limited internal space.

[0066] In summary, this invention prioritizes the construction of hollow piles, and then utilizes a root key jacking device to construct the extra-long jacking root key 4 through the cooperation of the jacking slide and the jacking reaction component. Figure 6 The diagram shows how automatic underwater jacking of ultra-long root keys was achieved even in the case of a large-diameter hollow drilled pile with a small internal cavity, ensuring the quality of root key construction.

[0067] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0068] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0069] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A root key jacking device, characterized in that, include: Lifting platform (1); The jacking reaction force assembly (2) is mounted on the hoisting platform (1). The jacking reaction force assembly (2) includes a reaction force seat (23) and a jacking slide (21). The reaction force seat (23) and the jacking slide (21) are connected as one unit. One end of the jacking slide (21) is provided with an opening (22). A jacking assembly (3) is assembled in the jacking slide (21). The jacking assembly (3) can be locked or unlocked with the jacking slide (21). The jacking assembly (3) is used to jack the jacking root key (4) located in the jacking slide (21) on one side underwater. When the jacking assembly (3) is locked with the jacking slide (21), the reaction seat (23) can provide reaction force support for the jacking action of the jacking assembly (3). When the jacking assembly (3) is unlocked from the jacking slide (21), the jacking assembly (3) can slide along the jacking slide (21). The jacking assembly (3) includes a jacking jack (31) and a locking part (32). The jacking jack (31) is disposed in the jacking slide (21) and the jacking jack (31) can slide along the jacking slide (21). The locking part (32) is disposed on the jacking jack (31) and the locking part (32) is used to lock with the jacking slide (21) to limit the sliding of the jacking jack (31) in the jacking slide (21). The jacking assembly (3) further includes a drive unit (33), which is mounted on the jacking root key (4) located in the jacking slide (21). The drive unit (33) is used to drive the jacking jack (31) in the unlocked state to move toward the jacking root key (4). The drive unit (33) includes a magnet, which is located at one end of the jacking root key (4) away from the opening (22). The magnet is used to attract the jacking jack (31) to move toward the jacking root key (4). The jacking slide (21) has a U-shaped cross section in its axial direction; One end of the reaction seat (23) is a plane and is connected to the jacking slide (21), and the other end is an arc-shaped surface adapted to the inner cavity of the hollow pile.

2. The root key jacking device as described in claim 1, characterized in that: The jacking slide (21) has multiple reserved holes (211) on its two opposite side walls. The multiple reserved holes (211) are spaced apart along the length of the jacking slide (21), and the reserved holes (211) on the two side walls are located in pairs corresponding to each other. The locking part (32) includes at least two locking jacks (321), which are symmetrically arranged around the center of the jacking jack (31). The actuating end of the locking jack (321) can extend and enter the reserved hole (211) to lock the jacking jack (31), or retract to unlock the jacking jack (31).

3. The root key jacking device as described in claim 2, characterized in that: The distance between two adjacent reserved holes (211) on the same side wall of the jacking slide (21) is equal to the jacking stroke of one jacking end of the jacking jack (31).

4. A method for key jacking construction using the key jacking device as described in any one of claims 1-3, characterized in that, Includes the following steps: Step S1. Hole the hollow pile (5) in stages and reserve multiple jacking slots (51) on the side wall of the hollow pile (5). Step S2. Set up a hollow pile inner formwork (52) inside the hollow pile (5) and cast the hollow pile (5) underwater; Step S3. Use a lifting device to lower the hoisting platform (1) into the cavity of the hollow pile (5), and align the jacking root key (4) in the jacking slide (21) with the jacking slot (51), while simultaneously pressing the reaction seat (23) against the inner surface of the hollow pile. Step S4. Control the jacking component (3) to jack the jacking root key (4) until the jacking root key (4) moves to the preset position.

5. The root key jacking construction method as described in claim 4, characterized in that, The control of the jacking assembly (3) to jack the jacking root key (4) includes: Lock the jacking assembly (3) to the jacking slide (21) and drive the jacking assembly (3) to push the jacking root key (4) one stroke; Unlock the jacking assembly (3) and drive the jacking assembly (3) to move one stroke toward the opening (22).

6. The root key jacking construction method as described in claim 5, characterized in that, Locking the jacking assembly (3) to the jacking slide (21) includes: The actuator of the locking jack (321) of the jacking assembly (3) is extended and inserted into the reserved hole (211) of the jacking slide (21) to lock the actuator of the locking jack (321).

7. The root key jacking construction method as described in claim 5, characterized in that, The process of driving the jacking assembly (3) to move one stroke toward the opening (22) includes: The jacking jack (31) of the jacking assembly (3) is attracted by the magnet of the jacking assembly (3) until the jacking jack (31) moves a distance, and then the locking jack (321) is used to lock the jacking jack (31).

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