Mechanical connecting type precast pile for collapsible loess treatment

Abstract

The application discloses a mechanical connection type prefabricated pile for collapsible loess treatment, relates to the technical field of prefabricated pile connection, and comprises a foundation pile and prefabricated piles distributed on the top of the foundation pile, wherein the inside of the prefabricated pile is provided with a connecting mechanism; the bottom of the prefabricated pile is provided with a lower connecting mechanism; the top of the prefabricated pile and the foundation pile is provided with an upper connecting mechanism; the lower connecting mechanism at the lower end of the prefabricated pile and the upper connecting mechanism at the upper end of the foundation pile are spliced and clamped and fixed through a fixing mechanism, and the fixing mechanism comprises a plurality of wedge-shaped grooves formed in the side walls of the upper connecting plate and the lower connecting plate. The mechanical connection type prefabricated pile for collapsible loess treatment has the effects of convenient installation, high structural strength and high stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of precast pile connection, and particularly relates to a mechanical connection type precast pile for collapsible loess treatment. BACKGROUND

[0002] The precast pile refers to in-situ precasting on a pile site or nearby, and relatively short piles can also be produced in a precasting factory; the precast pile has the characteristics of being able to bear a large load, being solid and durable, having a fast construction speed, and having a large influence on the surrounding environment; the construction procedure is precasting, transportation, piling, and sinking; the precast pile is a pile (such as a wood pile, a concrete square pile, a prestressed concrete pipe pile, a steel pile, etc.) made of various materials and various forms in a factory or a construction site, and the pile is driven, pressed, or vibrated into the soil by a pile sinking equipment; the precast piles mainly used in the field of Chinese building construction are mainly two categories of concrete precast piles and steel piles.

[0003] The existing precast pile connection mainly adopts the form of welding steel bars on end plates or anchoring steel bars with concrete filling cores, and the operation is complicated and even cannot reach the expected design target; and before the precast piles are used on collapsible loess, the surface of the loess is generally treated by ramming, but due to the special geology of the loess, the loess after being wet still has certain collapsibility, which can cause the precast pile to have a "sinking pile" phenomenon, and the existing precast pile structure cannot effectively solve this problem, and there is a short board of poor stability. SUMMARY

[0004] The present application discloses a mechanical connection type precast pile for collapsible loess treatment, which aims to solve the technical problem of complicated operation of the existing precast pile connection and poor stability of the precast pile used on collapsible loess.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] A mechanical connection type precast pile for collapsible loess treatment, comprising a base pile and precast piles distributed on the top of the base pile, an internal connection mechanism is arranged in the precast pile, the internal connection mechanism comprises a steel bar slidingly inserted into the precast pile, and both ends of the steel bar are respectively penetrated out from the upper and lower ends of the precast pile.

[0007] A lower connection mechanism is arranged at the bottom of the precast pile, and the lower connection mechanism comprises a lower connection plate clamped on the outer side of the bottom end of the precast pile.

[0008] An upper connection mechanism is arranged at the top of the precast pile and the base pile, and the upper connection mechanism comprises an upper connection plate fixed to the top of the base pile and the precast pile.

[0009] The lower connecting mechanism of the lower end of the prefabricated pile and the upper connecting mechanism of the upper end of the foundation pile are spliced and clamped and fixed by the fixed mechanism, the upper connecting mechanism of the prefabricated pile and the lower connecting mechanism of the lower end of another prefabricated pile are spliced and clamped and fixed by the fixed mechanism, and the fixed mechanism comprises a plurality of wedge-shaped grooves opened in the side walls of the upper connecting plate and the lower connecting plate, and a wedge-shaped pin is clamped and inserted between the wedge-shaped grooves of the upper connecting plate and the lower connecting plate.

[0010] The fixed mechanism cooperates with the lower connecting mechanism and the upper connecting mechanism to clamp and connect the foundation pile and the prefabricated pile, and triggers the operation of the upper connecting mechanism through the connection mechanism, thereby improving the stability of the prefabricated pile after being embedded in the collapsible loess.

[0011] By additionally providing the upper connecting mechanism and the lower connecting mechanism on the basis of the traditional prefabricated pile connecting structure, the middle part of the prefabricated pile is guided to be empty and connected to the upper connecting mechanism and the lower connecting mechanism through the connection mechanism, the quick connection of the foundation pile and the prefabricated pile is realized, the lower connecting mechanism is triggered to operate by knocking the connection mechanism, when the entire prefabricated pile sinks into the loess, the lower connecting mechanism is triggered to increase the contact area to support the entire structure, thereby preventing the prefabricated pile from sinking due to the influence of the soil quality, and the stability of the traditional prefabricated pile in special terrain is greatly improved, and the fixed mechanism additionally clamped between the upper connecting mechanism and the lower connecting mechanism cooperates with the triggering of the lower connecting mechanism to further lock the connected foundation pile and prefabricated pile, thereby greatly improving the stability and structural strength of the device.

[0012] In a preferred scheme, the connection mechanism further comprises a bottom thread groove provided on the outer side of the bottom of the steel bar, a top thread groove provided on the outer side of the top of the steel bar, and a double-layer sleeve structure threadedly connected to the outer side of the top thread groove.

[0013] By additionally providing the upper connecting mechanism and the lower connecting mechanism on the basis of the traditional prefabricated pile connecting structure, the middle part of the prefabricated pile is guided to be empty and connected to the upper connecting mechanism and the lower connecting mechanism through the connection mechanism, the quick connection of the foundation pile and the prefabricated pile is realized, the lower connecting mechanism is triggered to operate by knocking the connection mechanism, when the entire prefabricated pile sinks into the loess, the lower connecting mechanism is triggered to increase the contact area to support the entire structure, thereby preventing the prefabricated pile from sinking due to the influence of the soil quality, and the stability of the traditional prefabricated pile in special terrain is greatly improved, and the fixed mechanism additionally clamped between the upper connecting mechanism and the lower connecting mechanism cooperates with the triggering of the lower connecting mechanism to further lock the connected foundation pile and prefabricated pile, thereby greatly improving the stability and structural strength of the device.

[0014] In a preferred scheme, the lower connecting mechanism further comprises an inner thread sleeve slidably mounted in the lower connecting plate, the inner thread sleeve is threadedly connected with the bottom thread groove, and the outer side of the inner thread sleeve is rotatably connected with a plurality of uniformly distributed support members through connecting rods, and the support members are embedded in the interior of the lower connecting plate.

[0015] By setting the lower connecting plate structure with the built-in inner threaded sleeve at the bottom of the prefabricated pile, the lower connecting plate is installed to the bottom of the prefabricated pile through bolts, and the steel bar is connected by using the bottom end threaded groove and the inner threaded sleeve, when the lower connecting plate and the upper connecting mechanism at the top of the foundation pile are docked, the steel bar is vertically moved to extrude the inner threaded sleeve, so that the support connected to the inner threaded sleeve through the connecting rod is moved outward, thereby inserting into the deep layer of loess, and high stability is provided for the device when installed in the collapsible soil.

[0016] In a preferred scheme, the middle part of the upper connecting plate at the top of the prefabricated pile is provided with an outer threaded sleeve, the top end of the steel bar penetrates out from the inside of the outer threaded sleeve, and the double-layer sleeve and the outer threaded sleeve are threadedly connected.

[0017] By setting the upper connecting plate structure welded with the outer threaded sleeve at the top of the prefabricated pile and the foundation pile, the upper connecting plate is installed to the top of the prefabricated pile and the foundation pile through bolts, and after the worker hammers the steel bar to trigger the lower connecting plate, the steel bar is connected by using the double-layer sleeve and the outer threaded sleeve, so that the upper connecting plate, the steel bar and the lower connecting plate located around the same prefabricated pile are fixedly connected, and the structural stability of the device after installation is maintained.

[0018] In a preferred scheme, the fixing mechanism further comprises inclined grooves symmetrically arranged in the middle part of the wedge-shaped pin, and the bottom of each connecting rod is fixedly connected with an inclined surface insert, which is clamped in the inside of the inclined groove.

[0019] By setting the 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 fixation, the vertical stability of the upper connecting plate and the lower connecting plate after fixation is maintained, and the inside of the wedge-shaped pin is additionally provided with an inclined groove structure, when the connecting rod is rotated by the steel bar, the inclined surface insert additionally arranged at the bottom of the connecting rod is clamped into the inside of the inclined groove, so that the horizontal stability of the wedge-shaped pin is maintained, and the stability and structural strength of the foundation pile and the prefabricated pile after connection are greatly improved.

[0020] As can be seen from the above, the mechanical connection type prefabricated pile for collapsible loess treatment provided by the application has the following technical effects.

[0021] One: by inserting a reinforcing structure in the interior of the traditional solid precast pile, using the top threaded groove, bottom threaded groove and double sleeve structure set at both ends of the reinforcing bar to limit and fix the upper and lower connecting plates in turn, specifically, the reinforcing bar is connected by the bottom threaded groove and internal threaded sleeve, and connected by the double sleeve and external threaded sleeve, which greatly improves the efficiency of the traditional precast pile connection, and when the lower connecting plate and the upper connecting plate at the top of the pile are connected, the worker hammers the reinforcing bar and uses the vertical movement of the reinforcing bar to extrude the internal threaded sleeve, which can cause the support 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 installation of the device in the collapsible ground, and the reinforcing bar can also cause the upper connecting plate, reinforcing bar and lower connecting plate around the same precast pile to form fixed connection, maintaining the structural stability after installation of the device, thereby realizing the multiple effects of convenient installation, high structural strength and high stability.

[0022] Secondly, by setting a wedge-shaped groove structure between the upper and lower connecting plates, when the upper and lower connecting plates are spliced, the spliced wedge-shaped groove cooperates with the additional wedge-shaped pin to form a fixed connection, maintaining the vertical stability of the fixed upper and lower connecting plates, and the internal of the wedge-shaped pin is additionally provided with a inclined groove structure, when the connecting rod is pushed by the reinforcing bar to rotate, the inclined surface insert additionally set at the bottom of the connecting rod will be engaged into the internal of the inclined groove, thereby maintaining the horizontal stability of the wedge-shaped pin, and further improving the stability and structural strength of the pile and the precast pile after connection. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The overall structure diagram of the present application is provided.

[0024] Figure 2 The overall structure explosion diagram of the present application is provided.

[0025] Figure 3 The connection mechanism structure diagram of the present application is provided.

[0026] Figure 4 The upper connecting mechanism structure diagram of the present application is provided.

[0027] Figure 5 The upper connecting mechanism and reinforcing bar connection state diagram of the present application is provided.

[0028] Figure 6 The upper connecting plate structure sectional view of the present application is provided.

[0029] Figure 7 The lower connecting plate structure top view of the present application is provided.

[0030] Figure 8 The lower connecting plate structure sectional view of the present application is provided.

[0031] Figure 9 The connecting state sectional view of the double-layer sleeve and the lower connecting plate according to the present application.

[0032] Figure 10 The sectional view of the wedge-shaped pin in the engaged state according to the present application.

[0033] Figure 11 The schematic diagram of the wedge-shaped pin structure according to the present application.

[0034] Figure 12 The schematic diagram of the double-layer sleeve structure according to the present application.

[0035] Figure 13 The schematic diagram of the enlarged structure at A in the present application. Figure 1

[0036] In the figure: 1, base pile; 2, prefabricated pile; 3, connecting mechanism; 301, steel bar; 302, bottom threaded groove; 303, top threaded groove; 304, double-layer sleeve; 3041, engaging part; 3042, engaging sleeve; 3043, nut component; 4, lower connecting mechanism; 401, lower connecting plate; 402, internal threaded sleeve; 403, connecting rod; 404, support; 405, movable interval; 5, upper connecting mechanism; 501, upper connecting plate; 502, external threaded sleeve; 6, fixing mechanism; 601, wedge-shaped groove; 602, wedge-shaped pin; 603, inclined groove; 6031, sliding groove; 604, inclined surface insert; 7, bolt. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0038] The mechanical connecting type prefabricated pile for collapsible loess treatment disclosed in the present application is mainly applied to the scene of installing prefabricated piles on collapsible loess.

[0039] With reference to Figures 1 to 13 A mechanical connecting type prefabricated pile for collapsible loess treatment, comprising a base pile 1 and prefabricated piles 2 distributed on the top of the base pile 1, the prefabricated piles 2 are internally provided with a connecting mechanism 3, the connecting mechanism 3 comprises steel bars 301 slidingly inserted into the prefabricated piles 2, and the two ends of the steel bars 301 respectively pass through the upper and lower ends of the prefabricated piles 2.

[0040] The bottom of the prefabricated pile 2 is provided with a lower connecting mechanism 4, 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.

[0041] ​The top of the precast pile 2 and the base pile 1 is provided with an upper connecting mechanism 5, which comprises an upper connecting plate 501 fixed to the top of the base pile 1 and the precast pile 2;

[0042] 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 base pile 1 are spliced and clamped and fixed by the fixed mechanism 6, and 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 clamped and fixed by the fixed mechanism 6, and the fixed mechanism 6 comprises a plurality of wedge-shaped grooves 601 opened in the side walls of the upper connecting plate 501 and the lower connecting plate 401, and a wedge-shaped pin 602 is clamped and inserted between the wedge-shaped grooves 601 of the upper connecting plate 501 and the lower connecting plate 401.

[0043] The base pile 1 and the precast pile 2 are clamped and connected by the fixed mechanism 6 cooperating with the lower connecting mechanism 4 and the upper connecting mechanism 5, and the operation of the upper connecting mechanism 5 is triggered by the linking mechanism 3, thereby improving the stability of the precast pile 2 after being embedded in the collapsible loess.

[0044] In this embodiment, the worker places the base pile 1 vertically on the designated embedding point by the crane, and then installs an upper connecting mechanism 5 on the top of the base pile 1, inserts a linking mechanism 3 into the precast pile 2, and then installs a lower connecting mechanism 4 on the bottom of the precast pile 2, and then rotates the linking mechanism 3 to fix the linking mechanism 3 and the lower connecting mechanism 4, and then installs an upper connecting mechanism 5 on the top of the precast pile 2, and then lifts the entire precast pile 2 by the crane, and then aligns the bottom of the precast pile 2 with the top of the base pile 1, and then slowly lowers the precast pile 2, so that the lower connecting mechanism 4 at the bottom of the precast pile 2 is aligned with the upper connecting mechanism 5 at the top of the base pile 1, and then the worker clamps the fixed mechanism 6 between the lower connecting mechanism 4 and the upper connecting mechanism 5, thereby completing the connection and fixation of the base pile 1 and the precast pile 2, and then the worker uses the pile driver to press the top of the precast pile 2, and then presses the base pile 1 and the precast pile 2 into the embedding point, and then the worker uses the pile driver to press the upper end of the linking mechanism 3, so that the linking mechanism 3 is pressed to move towards the position of the lower connecting mechanism 4 and press the lower connecting mechanism 4, thereby causing the lower connecting mechanism 4 to extend and support in the surrounding loess, thereby supporting the entire precast pile 2.

[0045] The end of the base pile 1 and the precast pile 2 is connected with a plurality of groups of bolts 7, and the lower connecting plate 401 and the upper connecting plate 501 are fixed to the end of the base pile 1 and the precast pile 2 by the bolts 7 and the nuts, respectively.

[0046] Referring to Figures 2 to 3 , Figures 5 to 6 , Figure 9 , Figure 12In a preferred embodiment, the connecting mechanism 3 further comprises a bottom threaded groove 302 arranged on the outer side of the bottom end of the reinforcing bar 301, and a top threaded groove 303 arranged on the outer side of the top end of the reinforcing bar 301, and a double-layer sleeve 304 threadedly connected to the outer side of the top threaded groove 303.

[0047] The worker places the pile 1 vertically on the designated pre-buried point by the crane, and then installs an upper connecting mechanism 5 on the top of the pile 1, and then inserts a reinforcing bar 301 into the inside of the precast pile 2, and then installs a lower connecting mechanism 4 on the bottom of the precast pile 2, and then rotates the reinforcing bar 301 to threadedly connect the bottom threaded groove 302 on the outer side of the bottom end of the reinforcing bar 301 with the lower connecting mechanism 4.

[0048] Referring to Figures 1 to 2 , Figures 7 to 10 In a preferred embodiment, the lower connecting mechanism 4 further comprises an inner threaded sleeve 402 slidingly installed in the inside of the lower connecting plate 401, and the inner threaded sleeve 402 is threadedly connected with the bottom threaded groove 302, and the outer side of the inner threaded sleeve 402 is rotatably connected with a plurality of evenly distributed support members 404 through connecting rods 403, and the support members 404 are embedded in the inside of the lower connecting plate 401.

[0049] The worker places the pile 1 vertically on the designated pre-buried point by the crane, and then installs an upper connecting mechanism 5 on the top of the pile 1, and then inserts a reinforcing bar 301 into the inside of the precast pile 2, and then installs a lower connecting plate 401 on the bottom of the precast pile 2, and then rotates the reinforcing bar 301 to threadedly connect the bottom threaded groove 302 on the outer side of the bottom end of the reinforcing bar 301 with the inner threaded sleeve 402 in the inside of the lower connecting plate 401.

[0050] When the worker presses the top of the precast pile 2 by the pile driver, and presses the pile 1 and the precast pile 2 to the deep part of the pre-buried point, until the precast pile 2 sinks to the specified depth, at this time the worker slightly hammers the upper end of the reinforcing bar 301 by the pile driver, the reinforcing bar 301 is extruded and moves towards the position of the lower connecting plate 401 and extrudes the inner threaded sleeve 402, causing the inner threaded sleeve 402 to move downward and push the support members 404 through the connecting rods 403, causing the support members 404 to extend and support in the surrounding yellow soil, thereby increasing the contact area between the precast pile 2 and the soil and improving the stability, wherein the structural shape of the support members 404 can be designed according to the needs, such as plate-shaped, rod-shaped, rake-shaped, etc., as long as the structure can increase the contact area with the soil, which is within the protection scope of the present application.

[0051] Referring to Figures 1 to 2 , Figures 4 to 6 , Figure 9In a preferred embodiment, the middle part of the upper connecting plate 501 at the top of the precast pile 2 is provided with an external threaded sleeve 502, the top end of the reinforcing bar 301 penetrates from the inside of the external threaded sleeve 502, and the double-layer sleeve 304 and the external threaded sleeve 502 are screwed together.

[0052] The worker installs an upper connecting plate 501 on the top of the precast pile 2, when the worker hammers the upper end of the reinforcing bar 301 with a pile driver, the reinforcing bar 301 is extruded and moves towards the position of the lower connecting plate 401 and extrudes the internal threaded sleeve 402, at this time the worker installs a double-layer sleeve 304 on the top of the reinforcing bar 301, and rotates the double-layer sleeve 304, so that the double-layer sleeve 304 moves downward along the threaded groove 303 at the top end of the reinforcing bar 301, and at the same time is screwed with the external threaded sleeve 502 in the middle part of the upper connecting plate 501, thereby forming a fixed connection to the reinforcing bar 301.

[0053] Specifically, the inside of the lower connecting plate 401 is provided with a movable interval 405, and the connecting rods 403 are distributed inside the movable interval 405.

[0054] Referring to Figures 4 to 11 In a preferred embodiment, the fixing mechanism 6 further comprises a slanted groove 603 symmetrically formed in the middle part of the wedge-shaped pin 602, and the bottom of each connecting rod 403 is fixedly connected with a slanted surface insert 604 which is clamped in the inside of the slanted groove 603.

[0055] The worker places the foundation pile 1 vertically on the designated pre-buried point by crane, and 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 at the end of the precast pile 2, the worker lifts the entire precast pile 2 by crane, and 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 is aligned with the upper connecting plate 501 at the top of the foundation pile 1, at this time the wedge-shaped groove 601 between the lower connecting plate 401 and the upper connecting plate 501 is aligned, and the worker clamps a plurality of wedge-shaped pins 602 into the inside of the wedge-shaped groove 601, thereby completing the connection and fixation of the foundation pile 1 and the precast pile 2.

[0056] When the connecting rod 403 rotates, the slanted surface insert 604 fixed at the bottom moves and is inserted into the slanted groove 603 in the inside of the wedge-shaped pin 602, at this time the wedge-shaped pin 602 cannot move horizontally and cannot be separated from the inside of the wedge-shaped groove 601.

[0057] Further, the wedge-shaped pin 602 structure of the present application is wide at the top and bottom and narrow in the middle, in addition to the structure disclosed in the present application, other similar structures also belong to the protection scope of the present application.

[0058] Specifically, the top of the double-layered sleeve 304 is provided with a clamping part 3041, and the bottom of the lower connecting plate 401 is provided with a clamping sleeve 3042. When the two precast piles 2 need to be connected, 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 another precast pile 2, and at this time, the clamping part 3041 will be clamped and connected with the clamping sleeve 3042 on the other precast pile 2, as shown in Figure 9 and Figure 12 so as to further improve the stability.

[0059] Among them, the middle part of the double-layered sleeve 304 is provided with a nut member 3043, which is convenient for workers to rotate the double-layered sleeve 304 with a wrench.

[0060] Further, as shown in Figure 10 Since the inclined surface insert 604 moves along a circular arc trajectory with the connecting rod 403, a sliding groove 6031 is formed on the side surface of each inclined groove 603, which is used to facilitate the inclined surface insert 604 to be easily inserted into the inclined groove 603 inside the wedge pin 602 during the process of moving and descending, and the surface of the sliding groove 6031 presents an inclination angle to the direction of the inclined groove 603, so as to avoid the interference of the movement of the inclined surface insert 604.

[0061] Working principle: when in use, the worker places the foundation pile 1 vertically on the designated pre-buried point by using the crane, and at the same time, an upper connecting plate 501 is installed on the top of the foundation pile 1, so as to complete the preliminary preparation work of the foundation pile 1;

[0062] Then, a steel bar 301 is inserted into the precast pile 2, a lower connecting plate 401 is installed at the bottom of the precast pile 2, and the steel bar 301 is rotated so that the bottom thread groove 302 on the outer side of the bottom of the steel bar 301 is threadedly connected with the internal thread sleeve 402 inside the lower connecting plate 401. After that, the worker lifts the entire precast pile 2 by using the 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 is aligned and attached with the upper connecting plate 501 at the top of the foundation pile 1. At this time, the wedge-shaped groove 601 between the lower connecting plate 401 and the upper connecting plate 501 is aligned, and the worker inserts a plurality of wedge pins 602 into the inside of the wedge-shaped groove 601 in sequence, so as to complete the connection and fixation of the foundation pile 1 and the precast pile 2. In addition, whether to use welding, grouting or other reinforcement methods to further reinforce the foundation pile 1 and the precast pile 2 can be selected according to the needs, which is the existing means and will not be described here.

[0063] Thereafter, the worker punches the top periphery of the prefabricated pile 2 by the pile driver, punches the foundation pile 1 and the prefabricated pile 2 to the depth of the embedded point, until the prefabricated pile 2 is sunk to the specified depth, at this time, the worker slightly hammers the upper end of the steel bar 301 by the pile driver, the steel bar 301 is extruded to move to the position of the lower connecting plate 401 and extrude the inner threaded sleeve 402, so that the inner threaded sleeve 402 moves downward and pushes the support 404 through the connecting rod 403, so that the support 404 extends to support in the surrounding loess, thereby increasing the contact area between the prefabricated pile 2 and the soil, increasing the stability, and when the connecting rod 403 rotates, the inclined surface insert 604 fixed at the bottom is moved and inserted into the inclined groove 603 inside the wedge-shaped pin 602, the fixing of the wedge-shaped pin 602 is completed (as shown in Figure 9 、 Figure 10 and Figure 11 ), then the worker installs an upper connecting plate 501 on the top of the prefabricated pile 2, and installs a double-layer sleeve 304 on the top of the steel bar 301, and rotates the double-layer sleeve 304, so that the double-layer sleeve 304 moves downward along the top end threaded groove 303 of the steel bar 301, and is screwed with the outer threaded sleeve 502 in the middle of the upper connecting plate 501 at the same time, thereby forming a fixed connection with the steel bar 301 on the top of the prefabricated pile 2, preventing it from moving up and down, thereby completing the entire installation process. If the installation length of the prefabricated pile 2 needs to be lengthened, the above operation can be repeated for splicing. If the upper end of the steel bar 301 is too long, it can be cut to the appropriate size.

[0064] The above describes only the preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A mechanical connection type precast pile for collapsible loess treatment, comprising a base pile (1) and precast piles (2) distributed on the top of the base pile (1), characterized in that, The prefabricated pile (2) is internally provided with a connecting mechanism (3), which comprises a steel bar (301) slidingly inserted into the interior of the prefabricated pile (2), and both ends of the steel bar (301) respectively penetrate out from the upper and lower ends of the prefabricated pile (2); The bottom of the prefabricated pile (2) is provided with a lower connecting mechanism (4), which comprises a lower connecting plate (401) clamped to the outer side of the bottom end of the prefabricated pile (2); The top of the prefabricated pile (2) and the pile (1) is provided with an upper connecting mechanism (5), which comprises an upper connecting plate (501) fixed to the top of the pile (1) and the prefabricated pile (2); The lower connecting mechanism (4) of the lower end of the prefabricated pile (2) and the upper connecting mechanism (5) of the upper end of the pile (1) are spliced and clamped and fixed by the fixed mechanism (6), the upper connecting mechanism (5) of the upper end of the prefabricated pile (2) and the lower connecting mechanism (4) of the lower end of another prefabricated pile (2) are spliced and clamped and fixed by the fixed mechanism (6), and the fixed mechanism (6) comprises a plurality of wedge-shaped grooves (601) opened in the side walls of the upper connecting plate (501) and the lower connecting plate (401), a wedge-shaped pin (602) is clamped and inserted between the wedge-shaped grooves (601) of the upper connecting plate (501) and the lower connecting plate (401); The connecting mechanism (3) further comprises a bottom threaded groove (302) arranged on the outer side of the bottom of the steel bar (301), and a top threaded groove (303) arranged on the outer side of the top of the steel bar (301); The lower connecting mechanism (4) further comprises an internal threaded sleeve (402) slidingly installed in the interior of the lower connecting plate (401), the internal threaded sleeve (402) is in threaded connection with the bottom threaded groove (302), and the outer side of the internal threaded sleeve (402) is rotatably connected with a plurality of uniformly distributed supporting members (404) through connecting rods (403) respectively; The outer side of the top threaded groove (303) is in threaded connection with a double-layered sleeve assembly (304), the middle part of the upper connecting plate (501) at the top of the prefabricated pile (2) is provided with an external threaded sleeve (502), the top of the steel bar (301) penetrates out from the interior of the external threaded sleeve (502), and the double-layered sleeve assembly (304) is in threaded connection with the external threaded sleeve (502); The fixed mechanism (6) further comprises an inclined groove (603) symmetrically opened in the middle part of the wedge-shaped pin (602), and the bottom of each connecting rod (403) is fixedly connected with an inclined plug-in member (604) which is clamped in the interior of the inclined groove (603).

2. The mechanical connection type precast pile for collapsible loess treatment according to claim 1, characterized in that, The supporting members (404) are embedded in the interior of the lower connecting plate (401).

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

4. The mechanically connected precast pile for collapsible loess treatment according to claim 2, characterized in that, The top of the double-layer sleeve kit (304) is provided with a clamping part (3041), the bottom of the lower connecting plate (401) is provided with a clamping sleeve (3042), and the clamping part (3041) and the clamping sleeve (3042) on the other precast pile (2) are clamped and connected.

5. The mechanically connected precast pile for collapsible loess treatment according to claim 2, characterized in that, The middle part of the double-layer sleeve kit (304) is provided with a nut member (3043).

6. The mechanically connected precast pile for collapsible loess treatment according to claim 3, characterized in that, The inside of the lower connecting plate (401) is provided with a movable section (405), and the connecting rods (403) are distributed in the inside of the movable section (405).

7. The mechanically connected precast pile for collapsible loess treatment according to claim 5, characterized in that, The side surface of each chute (603) is provided with a sliding groove (6031).

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