Mechanical connection type precast pile for collapsible loess treatment

Abstract

The invention discloses a mechanical connection type precast pile for collapsible loess treatment, and relates to the technical field of precast pile connection, the mechanical connection type precast pile comprises a foundation pile and precast piles distributed at the top of the foundation pile, and a connection mechanism is arranged in each precast pile; a lower connecting mechanism is arranged at the bottom of the precast pile; an upper connecting mechanism is arranged at the top of the precast pile and the top of the foundation pile; the lower connecting mechanism at the lower end of the precast pile and the upper connecting mechanism at the upper end of the foundation pile are spliced and clamped and fixed through an arranged fixing mechanism, and the fixing mechanism comprises a plurality of wedge-shaped grooves formed in the side wall of the upper connecting plate and the side wall of the lower connecting plate. The mechanical connection type precast pile for collapsible loess treatment has the effects of being convenient to install, high in structural strength and high in stability.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated pile connection, in particular to a mechanically connected prefabricated pile for treating collapsible loess. Background Art

[0002] Precast piles refer to piles that are prefabricated on-site at or near the piling site. Shorter piles can also be produced in precast plants. They are characterized by their ability to withstand large loads, durability, fast construction speed, and greater impact on the surrounding environment. The construction procedure is prefabrication, transportation, stacking, and pile sinking. Precast piles are piles of various materials and forms (such as wooden piles, concrete square piles, prestressed concrete pipe piles, steel piles, etc.) made in factories or construction sites. The piles are driven, pressed or vibrated into the soil using pile driving equipment. The precast piles that are widely used in China's construction field are mainly concrete precast piles and steel piles.

[0003] Existing precast pile connections are mainly handled by welding steel bars on the end plates or anchoring steel bars with concrete core filling. The operation is cumbersome and may even fail to achieve the expected design goals. Moreover, most precast piles are generally compacted before being used in collapsible loess. However, due to the special geology of this type of land, the loess still has certain collapsible characteristics after being damp, which will cause the precast piles to "sink". The existing precast pile structure cannot effectively solve this problem and has shortcomings in use. Summary of the Invention

[0004] The invention discloses a mechanically connected prefabricated pile for treating collapsible loess, aiming to solve the technical problems of the existing prefabricated piles, such as complicated connection operation and poor stability when used in collapsible loess.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A mechanically connected prefabricated pile for treating collapsible loess, comprising a foundation pile and prefabricated piles distributed on top of the foundation pile; a connection mechanism is provided inside the prefabricated pile, the connection mechanism comprising steel bars slidably inserted into the prefabricated pile, with the ends of the steel bars extending through the upper and lower ends of the prefabricated pile respectively; The bottom of the precast pile is provided with a lower connecting mechanism, and the lower connecting mechanism includes a lower connecting plate clamped to the outer side of the bottom end of the precast pile; An upper connecting mechanism is provided on the top of the precast pile and the foundation pile, and the upper connecting mechanism includes an upper connecting plate fixed to the top of the foundation pile and the precast pile; The lower connecting mechanism at the lower end of the precast pile and the upper connecting mechanism at the upper end of the foundation pile are spliced ​​and fixed by a fixed mechanism, the upper connecting mechanism at the upper end of the precast pile and the lower connecting mechanism at the lower end of another precast pile are spliced ​​and fixed by a fixed mechanism, the fixed mechanism includes a plurality of wedge-shaped grooves provided on the side walls of the upper connecting plate and the lower connecting plate, and a wedge-shaped pin is inserted and engaged between the wedge grooves of the upper connecting plate and the wedge grooves of the lower connecting plate; The fixing mechanism is used to cooperate with the lower connecting mechanism and the upper connecting mechanism to engage and connect the foundation pile and the precast pile, and the upper connecting mechanism is triggered to operate by the connecting mechanism, thereby improving the stability of the precast pile after being pre-buried in the collapsible loess.

[0006] By additionally providing an upper connecting mechanism and a lower connecting mechanism on the basis of the traditional precast pile connection structure, the middle part of the precast pile is hollowed out and connected to the upper connecting mechanism and the lower connecting mechanism through a connecting mechanism, thereby realizing a quick connection between the foundation pile and the precast pile, and the lower connecting mechanism is triggered to operate by knocking the connecting mechanism. When the entire precast pile sinks into the loess, the entire structure is supported by increasing the contact area after the lower connecting mechanism is triggered, thereby preventing the precast pile from being affected by the soil and sinking, and greatly improving the stability of the traditional precast pile when adapting to special terrain. The additional fixing mechanism engaged between the upper connecting mechanism and the lower connecting mechanism can cooperate with the triggering of the lower connecting mechanism to further lock the connected foundation pile and precast pile, thereby greatly improving the stability and structural strength of the device.

[0007] In a preferred solution, the connection mechanism further includes a bottom thread groove provided on the outside of the bottom of the steel bar, a top thread groove is provided on the outside of the top of the steel bar, and the outer side of the top thread groove is threadedly connected to a double-layer kit.

[0008] On the basis of traditional solid prefabricated piles, the prefabricated piles are set as hollow structures, and steel bars are inserted into the interior of the prefabricated piles. The top thread grooves, bottom thread grooves and double-layer kit structures additionally provided at both ends of the steel bars are used to limit and fix the upper connecting mechanism and the lower connecting mechanism in turn, thereby maintaining the stability of the upper connecting mechanism and the lower connecting mechanism after installation. At the same time, the stamping of the steel bars is used to trigger the lower connecting mechanism to play a supporting role, thereby ensuring the integrity of the operation of this device.

[0009] In a preferred solution, the lower connecting mechanism also includes an internal threaded sleeve slidably installed inside the lower connecting plate, the internal threaded sleeve is threadedly connected to the bottom end thread groove, and the outer side of the internal threaded sleeve is rotatably connected to a number of evenly distributed support members through connecting rods, and the support members are embedded in the interior of the lower connecting plate.

[0010] By arranging a lower connecting plate structure with a built-in internal threaded sleeve at the bottom of the precast pile, the lower connecting plate is installed to the bottom of the precast pile by bolts, and the steel bar is connected with the internal threaded sleeve by using the bottom thread groove. After the lower connecting plate and the upper connecting mechanism on the top of the foundation pile are docked, the steel bar is used to move vertically to squeeze the internal threaded sleeve, causing the support member connected to the internal threaded sleeve by the connecting rod to move outward, thereby inserting into the deep layer of loess, providing high stability for the device when installed in a subsidence area.

[0011] In a preferred solution, an external threaded sleeve is provided in the middle of the upper connecting plate at the top of the precast pile, the top end of the steel bar passes through the inside of the external threaded sleeve, and the double-layer sleeve is threadedly connected to the external threaded sleeve.

[0012] An upper connecting plate structure welded with an external threaded sleeve is set on the top of the precast pile and the foundation pile, and the upper connecting plate is installed to the top of the precast pile and the foundation pile by bolts. At the same time, after the workers hammer the steel bar to trigger the lower connecting plate, the steel bar is connected with the double-layer kit and the external threaded sleeve, so that the upper connecting plate, steel bar and lower connecting plate located around the same precast pile form a fixed connection, maintaining the structural stability of the device after installation.

[0013] In a preferred solution, the fixing mechanism further includes an oblique groove symmetrically opened in the middle of the wedge-shaped pin, and the bottom of each connecting rod is fixedly connected to an oblique plug-in, and the oblique plug-in is engaged with the inside of the oblique groove.

[0014] By providing a wedge-shaped groove structure between the upper connecting plate and the lower connecting plate, when the upper connecting plate and the lower connecting plate are spliced, the spliced ​​wedge-shaped groove cooperates with the additional inserted wedge-shaped pin to form a fixation, thereby maintaining the vertical stability of the upper connecting plate and the lower connecting plate after they are fixed, and an additional inclined groove structure is provided inside the wedge pin. When the connecting rod is rotated by the push of the steel bar, the inclined plug-in additionally provided at the bottom of the connecting rod will be engaged with the inside of the inclined groove, thereby maintaining the horizontal stability of the wedge pin, thereby greatly improving the stability and structural strength of the foundation pile and the precast pile after connection.

[0015] From the above, it can be seen that the mechanically connected prefabricated piles for treating collapsible loess provided by the present invention have the following technical effects.

[0016] First, based on the traditional solid precast pile, a steel bar structure is inserted into the interior of the precast pile, and the top thread groove, bottom thread groove and double-layer kit structure additionally provided at both ends of the steel bar are used to limit and fix the upper connecting plate and the lower connecting plate in sequence. Specifically, the steel bar is connected by the bottom thread groove and the internal thread sleeve, and by the double-layer kit and the external thread sleeve, which greatly improves the efficiency of traditional precast pile connection. After the lower connecting plate and the upper connecting plate on the top of the foundation pile are connected, the worker hammers the steel bar and uses the vertical movement of the steel bar to squeeze the internal thread sleeve, which can cause the support connected to the internal thread sleeve through the connecting rod to move outward, thereby inserting into the deep layer of loess, providing high stability for the device when installed in the subsidence ground. The steel bar can also cause the upper connecting plate, steel bar and lower connecting plate located around the same precast pile to form a fixed connection, maintain the structural stability of the device after installation, thereby achieving the multiple effects of convenient installation, high structural strength and high stability.

[0017] Secondly, a wedge-shaped groove structure is provided between the upper connecting plate and the lower connecting plate. When the upper connecting plate and the lower connecting plate are spliced, the spliced ​​wedge-shaped groove cooperates with the additional inserted wedge-shaped pin to form a fixation, thereby maintaining the vertical stability of the upper connecting plate and the lower connecting plate after they are fixed. In addition, an inclined groove structure is additionally provided inside the wedge pin. When the connecting rod is rotated by the push of the steel bar, the inclined plug-in additionally provided at the bottom of the connecting rod will be engaged with the inside of the inclined groove, thereby maintaining the horizontal stability of the wedge pin, thereby greatly improving the stability and structural strength of the foundation pile and the precast pile after connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall structure proposed by the present invention.

[0019] Figure 2 This is an exploded view of the overall structure proposed by the present invention.

[0020] Figure 3 This is a schematic structural diagram of the connection mechanism proposed in the present invention.

[0021] Figure 4 This is a schematic structural diagram of the upper connecting mechanism proposed in the present invention.

[0022] Figure 5 This is a schematic diagram of the upper connecting mechanism and the steel bar connection status proposed by the present invention.

[0023] Figure 6 This is a cross-sectional view of the upper connecting plate structure proposed by the present invention.

[0024] Figure 7 This is a top view of the lower connecting plate structure proposed by the present invention.

[0025] Figure 8 This is a cross-sectional view of the lower connecting plate structure proposed by the present invention.

[0026] Figure 9 This is a cross-sectional view of the connection state of the double-layer kit and the lower connecting plate proposed by the present invention.

[0027] Figure 10 This is a cross-sectional view of the wedge pin in the engaged state proposed by the present invention.

[0028] Figure 11 This is a schematic diagram of the wedge pin structure proposed in the present invention.

[0029] Figure 12 This is a schematic diagram of the double-layer kit structure proposed by the present invention.

[0030] Figure 13 The present invention proposes Figure 1 Enlarged structural diagram at point A in the middle.

[0031] In the figure: 1. foundation pile; 2. precast pile; 3. connecting mechanism; 301. steel bar; 302. bottom thread groove; 303. top thread groove; 304. double-layer kit; 3041. snap-fit ​​part; 3042. snap-fit ​​sleeve; 3043. nut member; 4. lower connecting mechanism; 401. lower connecting plate; 402. internal thread sleeve; 403. connecting rod; 404. support member; 405. movable interval; 5. upper connecting mechanism; 501. upper connecting plate; 502. external thread sleeve; 6. fixing mechanism; 601. wedge groove; 602. wedge pin; 603. inclined groove; 6031. slide groove; 604. inclined plug-in; 7. bolt. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] The mechanically connected prefabricated piles for treating collapsible loess disclosed in the present invention are mainly used in the scenario of installing prefabricated piles on collapsible loess.

[0034] Reference Figures 1 to 13 A mechanically connected prefabricated pile for treating collapsible loess comprises a foundation pile 1, a prefabricated pile 2 distributed on top of the foundation pile 1, a connection mechanism 3 provided inside the prefabricated pile 2, the connection mechanism 3 comprising a steel bar 301 slidably inserted into the prefabricated pile 2, and two ends of the steel bar 301 respectively extending through the upper and lower ends of the prefabricated pile 2; The bottom of the precast pile 2 is provided with a lower connecting mechanism 4, which includes a lower connecting plate 401 that is clamped to the outer side of the bottom end of the precast pile 2; An upper connecting mechanism 5 is provided on the top of the precast pile 2 and the foundation pile 1. The upper connecting mechanism 5 includes an upper connecting plate 501 fixed to the top of the foundation pile 1 and the precast pile 2; The lower connecting mechanism 4 at the lower end of the precast pile 2 and the upper connecting mechanism 5 at the upper end of the foundation pile 1 are spliced ​​and fixed by a fixed mechanism 6. The upper connecting mechanism 5 at the upper end of the precast pile 2 and the lower connecting mechanism 4 at the lower end of another precast pile 2 are spliced ​​and fixed by a fixed mechanism 6. The fixed mechanism 6 includes a plurality of wedge-shaped grooves 601 formed on the side walls of the upper connecting plate 501 and the lower connecting plate 401. A wedge-shaped pin 602 is inserted and engaged between the wedge-shaped groove 601 of the upper connecting plate 501 and the wedge-shaped groove 601 of the lower connecting plate 401. The fixing mechanism 6 is used to cooperate with the lower connecting mechanism 4 and the upper connecting mechanism 5 to engage and connect the foundation pile 1 and the precast pile 2, and the upper connecting mechanism 5 is triggered to operate through the connecting mechanism 3 to improve the stability of the precast pile 2 after it is pre-buried in the collapsible loess.

[0035] In this embodiment: workers use a crane to place the foundation pile 1 vertically at the designated pre-buried point, and at the same time install an upper connecting mechanism 5 on the top of the foundation pile 1, then insert the connecting mechanism 3 into the interior of the precast pile 2, and install a lower connecting mechanism 4 on the bottom of the precast pile 2. At the same time, the connecting mechanism 3 is rotated to fix the connecting mechanism 3 and the lower connecting mechanism 4. After the connection is completed, an upper connecting mechanism 5 is installed on the top of the precast pile 2. Then, the entire precast pile 2 is lifted by a crane, and the bottom of the precast pile 2 is aligned with the top of the foundation pile 1 and then slowly lowered, so that the lower connecting mechanism 4 at the bottom of the precast pile 2 and the upper connecting mechanism at the top of the foundation pile 1 are aligned. 5. After the lower connecting mechanism 4 and the upper connecting mechanism 5 are aligned, the worker engages the fixing mechanism 6 between the lower connecting mechanism 4 and the upper connecting mechanism 5 to complete the connection and fixation of the foundation pile 1 and the precast pile 2. After that, the worker uses the pile driver to punch the top of the precast pile 2, and punches the foundation pile 1 and the precast pile 2 deep into the pre-buried point until the precast pile 2 sinks to the specified depth. At this time, the worker uses the pile driver to punch the upper end of the connecting mechanism 3. The connecting mechanism 3 is squeezed and moves toward the position of the lower connecting mechanism 4 and squeezes the lower connecting mechanism 4, causing the lower connecting mechanism 4 to trigger the extension of support into the surrounding loess, thereby forming support for the entire precast pile 2.

[0036] The ends of the foundation pile 1 and the precast pile 2 are connected with a plurality of sets of bolts 7 , and the lower connecting plate 401 and the upper connecting plate 501 are fixed to the ends of the foundation pile 1 and the precast pile 2 respectively by bolts 7 and nuts.

[0037] Reference Figures 2 to 3 、 Figures 5 and 6 、 Figure 9 、 Figure 12 In a preferred embodiment, the connection mechanism 3 also includes a bottom thread groove 302 arranged on the outside of the bottom of the steel bar 301, a top thread groove 303 is arranged on the outside of the top of the steel bar 301, and the outer side of the top thread groove 303 is threadedly connected to a double-layer kit 304.

[0038] Workers use a crane to place the foundation pile 1 vertically at the designated embedded point, and at the same time install an upper connecting mechanism 5 on the top of the foundation pile 1, insert a steel bar 301 into the inside of the precast pile 2, and install a lower connecting mechanism 4 on the bottom of the precast pile 2. At the same time, the steel bar 301 is rotated so that the bottom thread groove 302 on the outside of the bottom of the steel bar 301 is threadedly connected to the lower connecting mechanism 4.

[0039] Reference Figures 1 to 2 、 Figures 7 to 10 In a preferred embodiment, the lower connecting mechanism 4 also includes an internal threaded sleeve 402 slidably installed inside the lower connecting plate 401, the internal threaded sleeve 402 is threadedly connected to the bottom end thread groove 302, and the outer side of the internal threaded sleeve 402 is rotatably connected to a number of evenly distributed support members 404 through connecting rods 403, and the support members 404 are embedded in the interior of the lower connecting plate 401.

[0040] Workers use a crane to vertically place the foundation pile 1 at the designated pre-embedded point, and at the same time install an upper connecting mechanism 5 on the top of the foundation pile 1. Then, a steel bar 301 is inserted into the interior of the precast pile 2, and a lower connecting plate 401 is installed at the bottom of the precast pile 2. At the same time, the steel bar 301 is rotated so that the bottom thread groove 302 on the outside of the bottom of the steel bar 301 is threadedly connected with the internal thread sleeve 402 inside the lower connecting plate 401. When workers use pile drivers to punch the top of precast pile 2, punch foundation pile 1 and precast pile 2 deep into the pre-buried point until precast pile 2 sinks to the specified depth, workers use pile drivers to lightly hammer the upper end of steel bar 301, and steel bar 301 is squeezed and moves toward the position of lower connecting plate 401 and squeezes internal threaded sleeve 402, causing internal threaded sleeve 402 to move downward and push support member 404 through connecting rod 403, causing support member 404 to extend support into the surrounding loess, thereby increasing the contact area between precast pile 2 and soil and improving stability. The structural shape of support member 404 can be designed according to needs, such as plate-shaped, rod-shaped, rake-shaped, etc. As long as the structure can increase the contact area with the soil, it is within the protection scope of this application.

[0041] Reference Figures 1 to 2 、 Figures 4 to 6 、 Figure 9 In a preferred embodiment, an external threaded sleeve 502 is provided in the middle of the upper connecting plate 501 at the top of the precast pile 2, the top end of the steel bar 301 passes through the inside of the external threaded sleeve 502, and the double-layer kit 304 is threadedly connected to the external threaded sleeve 502.

[0042] Workers install an upper connecting plate 501 on the top of the precast pile 2. When the workers use a pile driver to hammer the upper end of the steel bar 301, the steel bar 301 is squeezed and moves toward the position of the lower connecting plate 401 and squeezes the internal threaded sleeve 402. At this time, the workers install a double-layer kit 304 on the top of the steel bar 301 and rotate the double-layer kit 304, causing the double-layer kit 304 to move downward along the threaded groove 303 at the top of the steel bar 301. At the same time, it is threadedly connected to the external threaded sleeve 502 in the middle of the upper connecting plate 501, thereby forming a fixed connection with the steel bar 301.

[0043] Specifically, a movable area 405 is provided inside the lower connecting plate 401 , and the connecting rods 403 are distributed inside the movable area 405 .

[0044] Reference Figures 4 to 11 In a preferred embodiment, the fixing mechanism 6 further includes an oblique groove 603 symmetrically opened in the middle of the wedge pin 602 , and the bottom of each connecting rod 403 is fixedly connected with an inclined plug-in 604 , which is engaged with the inside of the oblique groove 603 .

[0045] The worker uses a crane to place the foundation pile 1 vertically at the designated pre-embedded point, and at the same time installs an upper connecting plate 501 on the top of the foundation pile 1. After completing the installation of the upper connecting plate 501 and the lower connecting plate 401 on the end of the precast pile 2, the worker uses the crane to lift the entire precast pile 2, aligns the bottom of the precast pile 2 with the top of the foundation pile 1, and then slowly lowers it, so that the lower connecting plate 401 at the bottom of the precast pile 2 and the upper connecting plate 501 at the top of the foundation pile 1 are aligned. At this time, the wedge-shaped grooves 601 between the lower connecting plate 401 and the upper connecting plate 501 are aligned, and the worker sequentially engages several wedge-shaped pins 602 with the inside of the wedge-shaped grooves 601 to complete the connection and fixation of the foundation pile 1 and the precast pile 2; When the connecting rod 403 rotates, it will also drive the inclined surface plug-in 604 fixed at the bottom to move and insert into the inclined groove 603 inside the wedge pin 602. At this time, the wedge pin 602 cannot move horizontally or detach from the wedge groove 601.

[0046] Furthermore, the wedge pin 602 structure of the present application is wide at the upper and lower ends and narrow in the middle. In addition to adopting the structure disclosed in the present application, other similar structures also fall within the scope of protection of the present application.

[0047] Specifically, a snap-fit ​​portion 3041 is provided on the top of the double-layer kit 304, and a snap-fit ​​sleeve 3042 is provided on the bottom of the lower connecting plate 401. When two precast piles 2 need to be docked later, the lower connecting plate 401 at the bottom of the precast pile 2 will be aligned with the upper connecting plate 501 at the top of the other precast pile 2. At this time, the snap-fit ​​portion 3041 will be snap-fitted and connected with the snap-fit ​​sleeve 3042 on the other precast pile 2. Figure 9 and Figure 12 As shown, the stability is further improved.

[0048] A nut component 3043 is provided in the middle of the double-layer kit 304 to facilitate workers to rotate the double-layer kit 304 with a wrench.

[0049] Further, such as Figure 10 As shown, since the inclined surface plug-in 604 moves in a circular arc trajectory along with the connecting rod 403, a slide groove 6031 is opened on the side of each inclined groove 603 to facilitate the inclined surface plug-in 604 to be more easily inserted into the inclined groove 603 inside the wedge pin 602 during the movement and descent process, and the surface of the slide groove 6031 is inclined at an angle toward the inclined groove 603 to avoid interference with the movement of the inclined surface plug-in 604.

[0050] Working Principle: When in use, workers use a crane to vertically place the foundation pile 1 at the designated pre-embedded point, and at the same time install an upper connecting plate 501 on the top of the foundation pile 1 to complete the preliminary preparation work of the foundation pile 1; Then, a steel bar 301 is inserted into the interior of the precast pile 2, and a lower connecting plate 401 is installed at the bottom of the precast pile 2. At the same time, the steel bar 301 is rotated so that the bottom thread groove 302 outside the bottom of the steel bar 301 is threadedly connected with the internal thread sleeve 402 inside the lower connecting plate 401. Then, the worker lifts the entire precast pile 2 with a crane, aligns the bottom of the precast pile 2 with the top of the foundation pile 1, and then slowly lowers it, so that the lower connecting plate 401 at the bottom of the precast pile 2 and the upper connecting plate 501 at the top of the foundation pile 1 are aligned and fit together. At this time, the wedge-shaped grooves 601 between the lower connecting plate 401 and the upper connecting plate 501 are aligned, and the worker engages several wedge pins 602 in turn with the inside of the wedge grooves 601 to complete the connection and fixation of the foundation pile 1 and the precast pile 2. In addition, according to needs, whether to use welding, grouting or other reinforcement methods to further reinforce the foundation pile 1 and the precast pile 2 can be selected. This is an existing means and will not be repeated here. After that, the workers use the pile driver to punch the outer periphery of the top of the precast pile 2, and punch the foundation pile 1 and the precast pile 2 deep into the pre-buried point until the precast pile 2 sinks to the specified depth. At this time, the workers use the pile driver to lightly hammer the upper end of the steel bar 301. The steel bar 301 is squeezed and moves toward the position of the lower connecting plate 401 and squeezes the internal threaded sleeve 402, causing the internal threaded sleeve 402 to move downward and push the support member 404 through the connecting rod 403, causing the support member 404 to extend and support the surrounding loess, thereby increasing the contact area between the precast pile 2 and the soil and increasing stability. When the connecting rod 403 rotates, it will also drive the inclined plug-in 604 fixed at the bottom to move and be inserted into the inclined groove 603 inside the wedge pin 602, completing the fixation of the wedge pin 602 (as shown in the figure). Figure 9 、 Figure 10 and Figure 11As shown), the worker then installs an upper connecting plate 501 on the top of the precast pile 2, and at the same time, the worker installs a double-layer kit 304 on the top of the steel bar 301, and rotates the double-layer kit 304, causing the double-layer kit 304 to move downward along the threaded groove 303 at the top of the steel bar 301. While moving downward, it is threadedly connected with the external threaded sleeve 502 in the middle of the upper connecting plate 501, thereby forming a fixed connection for the steel bar 301 located at the top of the precast pile 2 to prevent it from moving up and down, thereby completing the entire installation process. If the installation length of the precast pile 2 needs to be lengthened, the above operation can be repeated for splicing. If the upper end of the steel bar 301 is exposed too long, it can be cut to the appropriate size.

[0051] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A mechanically connected prefabricated pile for treating collapsible loess, comprising a foundation pile (1) and prefabricated piles (2) distributed on top of the foundation pile (1), characterized in that: A connection mechanism (3) is provided inside the prefabricated pile (2), and the connection mechanism (3) comprises a steel bar (301) that is slidably inserted into the interior of the prefabricated pile (2), and two ends of the steel bar (301) respectively pass through the upper and lower ends of the prefabricated pile (2); A lower connecting mechanism (4) is provided at the bottom of the prefabricated pile (2), and the lower connecting mechanism (4) comprises a lower connecting plate (401) clamped to the outer side of the bottom end of the prefabricated pile (2); An upper connection mechanism (5) is provided on the top of the precast pile (2) and the foundation pile (1), and the upper connection mechanism (5) comprises an upper connection plate (501) fixed to the top of the foundation pile (1) and the precast pile (2); The lower connecting mechanism (4) at the lower end of the precast pile (2) and the upper connecting mechanism (5) at the upper end of the foundation pile (1) are spliced ​​and fixed by a fixed mechanism (6); the upper connecting mechanism (5) at the upper end of the precast pile (2) and the lower connecting mechanism (4) at the lower end of another precast pile (2) are spliced ​​and fixed by a fixed mechanism (6); the fixed mechanism (6) includes a plurality of wedge-shaped grooves (601) provided on the side walls of the upper connecting plate (501) and the lower connecting plate (401); a wedge-shaped pin (602) is inserted and engaged between the wedge-shaped groove (601) of the upper connecting plate (501) and the wedge-shaped groove (601) of the lower connecting plate (401); The connection mechanism (3) further comprises a bottom thread groove (302) provided on the outside of the bottom of the steel bar (301), and a top thread groove (303) is provided on the outside of the top of the steel bar (301); The lower connecting mechanism (4) further comprises an internal threaded sleeve (402) slidably mounted inside the lower connecting plate (401), the internal threaded sleeve (402) being threadedly connected to the bottom thread groove (302), and the outer side of the internal threaded sleeve (402) being rotatably connected to a plurality of evenly distributed support members (404) via connecting rods (403).

2. The mechanically connected prefabricated pile for collapsible loess treatment according to claim 1, characterized in that: The outer side of the top thread groove (303) is threadedly connected to a double-layer sleeve (304).

3. The mechanically connected prefabricated pile for treating collapsible loess according to claim 2, characterized in that: The support member (404) is embedded in the interior of the lower connecting plate (401).

4. The mechanically connected prefabricated pile for treating collapsible loess according to claim 2, characterized in that: An external threaded sleeve (502) is provided in the middle of the upper connecting plate (501) at the top of the prefabricated pile (2), the top end of the steel bar (301) passes through the inside of the external threaded sleeve (502), and the double-layer sleeve (304) and the external threaded sleeve (502) are threadedly connected.

5. The mechanically connected prefabricated pile for treating collapsible loess according to claim 3, characterized in that: The fixing mechanism (6) further comprises an oblique groove (603) symmetrically arranged in the middle of the wedge-shaped pin (602), and a bevel plug-in (604) is fixedly connected to the bottom of each connecting rod (403), and the bevel plug-in (604) is engaged with the inside of the oblique groove (603).

6. The mechanically connected prefabricated pile for collapsible loess treatment according to claim 1, characterized in that: The ends of the foundation pile (1) and the precast pile (2) are both connected with a plurality of groups of bolts (7), and the lower connecting plate (401) and the upper connecting plate (501) are respectively fixed to the ends of the foundation pile (1) and the precast pile (2) via the bolts (7).

7. The mechanically connected prefabricated pile for treating collapsible loess according to claim 2, characterized in that: The top of the double-layer kit (304) is provided with a snap-fit ​​portion (3041), and the bottom of the lower connecting plate (401) is provided with a snap-fit ​​sleeve (3042). The snap-fit ​​portion (3041) is snap-fitted and connected with the snap-fit ​​sleeve (3042) on another prefabricated pile (2).

8. The mechanically connected prefabricated pile for treating collapsible loess according to claim 2, characterized in that: A nut component (3043) is provided in the middle of the double-layer kit (304).

9. The mechanically connected prefabricated pile for treating collapsible loess according to claim 3, characterized in that: A movable interval (405) is provided inside the lower connecting plate (401), and the connecting rod (403) is distributed inside the movable interval (405).

10. The mechanically connected prefabricated pile for treating collapsible loess according to claim 5, characterized in that: A sliding groove (6031) is provided through the side surface of each inclined groove (603).

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