Mechanical joint device for precast concrete pile

Abstract

The utility model discloses a prefabricated concrete pile's mechanical joint device, including for fixing in prefabricated concrete pile butt joint and coaxial upper sleeve and lower sleeve, the opening of upper sleeve is downward, the opening of lower sleeve is upward, there is a compression spring in upper sleeve, and the bottom of compression spring is in abutment with a steel ball, and the top of steel ball is fixed with a spiral rod, and the inner bottom of upper sleeve has a steel ball axial limit ring, there is a spiral guide strip on spiral rod, and the upper end of lower sleeve is a nut, and the nut has spiral guide groove that is screwed with spiral guide strip and is in abututment with compression spring with upper section prefabricated concrete pile linear depression and makes spiral rod lower rotation, there is quick dry adhesive in lower sleeve when butt joint injection, and the butt joint state is that the bottom end surface of upper sleeve and the top end surface of the nut of lower sleeve are in abutment, and spiral rod is fixed with adhesive and can not rotate, and spiral guide strip and spiral guide groove axial hold up resistance and pull out. The mechanical joint device structure is relatively simple, and the material cost is relatively low and processing, and installation and butt joint process are relatively convenient and fast.

Description

Technical Field

[0001] This utility model relates to the field of foundation construction technology, specifically a mechanical joint device for precast concrete piles. Background Technology

[0002] In the foundation construction of existing multi-section precast concrete piles that are connected coaxially to form a single pile, the adjacent upper and lower sections of the multi-section precast concrete piles are generally connected using a mechanical joint device.

[0003] There are many types of mechanical joint devices in the existing technology, with different functions. For example, some use elastic tooth meshing, some use male and female snap-fit, and some use cross pin insertion. However, they still have their own shortcomings. For example, some structures are still relatively complex, some materials are still relatively expensive, and some processing, installation, and docking processes are relatively complicated. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a mechanical joint device for precast concrete piles that has a relatively simple structure, relatively low material cost, and relatively convenient and quick processing, installation and docking process.

[0005] The technical solution of this utility model is to provide a mechanical joint device for precast concrete piles, including an upper sleeve and a lower sleeve for fixing at the joint of the precast concrete piles and coaxially. The opening of the upper sleeve faces downward and the opening of the lower sleeve faces upward. There is a compression spring inside the upper sleeve, the bottom end of which abuts against a steel ball. The steel ball is fixed to the top end of a spiral rod. There is an axial limiting ring for the steel ball at the inner bottom end of the upper sleeve. There is a spiral guide bar on the spiral rod. The upper end of the lower sleeve is a nut. There is a spiral guide groove inside the nut that is screwed into the spiral guide bar and connected to the compression spring. As the upper section of the precast concrete pile is pressed down linearly, the spiral rod rotates downward. There is quick-drying adhesive injected into the lower sleeve during the joint. In the joint state, the bottom end face of the upper sleeve abuts against the top end face of the nut of the lower sleeve, and the spiral rod is fixed by the adhesive and cannot rotate. The spiral guide bar and the spiral guide groove are axially engaged and resist pull-out. The upper sleeve is a split structure, and the split parts are connected to each other.

[0006] With the above structure, the mechanical joint device for precast concrete piles of this utility model has the following advantages:

[0007] The upper and lower sleeves are on the same axis. When the upper precast concrete pile is lowered, the compression spring applies pressure to the moving steel ball. The spiral guide bar on the spiral rod smoothly rotates down along the spiral guide groove of the nut, converting the axial force into rotational motion. Quick-drying glue can be injected at the same time as the spiral rod is aligned with the nut and about to be lowered or lowered. This allows for quick docking and also fixes the spiral rod after docking so that it cannot rotate. The spiral guide bar and the spiral guide groove are axially engaged, i.e., axially abutted and locked, providing sufficient pull-out resistance.

[0008] The upper sleeve adopts a split structure, which makes its processing, installation and docking process convenient and quick.

[0009] The mechanical joint device for precast concrete piles of this utility model has a relatively simple structure, relatively low material cost, and relatively convenient and quick processing, installation and docking processes.

[0010] Furthermore, the cross-section of the helical guide bar of the screw rod is semi-circular, and the cross-section of the helical guide groove of the nut is triangular or trapezoidal. Using this structure, analogous to a thread, the helical guide bar is analogous to a male thread, employing smooth, arc-shaped threads, while the helical guide groove is analogous to a female thread, employing triangular or trapezoidal threads. Under the axial pushing force of the compression spring, the arc-shaped threads of the male thread and the triangular or trapezoidal threads of the female thread make point contact, sliding down the helical line rather than the helical surface. This converts the axial force into a more flexible and smoother rotational motion, resulting in less resistance to downward rotation, better smoothness, and faster speed. This more easily and flexibly converts the downward driving force into the rotational motion of the screw rod, further ensuring convenient and quick processing, installation, and docking.

[0011] Furthermore, the upper sleeve is detachably connected to its constituent parts. This structure further ensures a simple design, relatively low material costs, and convenient and quick processing, installation, and connection.

[0012] Furthermore, the upper sleeve is divided into a top sleeve and a bottom sleeve. The top sleeve has a top plate, and the top sleeve and the bottom sleeve are connected by internal and external threads. With the above structure, the axial limiting ring for the steel ball can be integrally formed with the bottom sleeve of the upper sleeve. During installation, the helical rod, steel ball, and compression spring can be inserted into the upper opening of the bottom sleeve, and then the internal and external threads of the top sleeve and the bottom sleeve can be tightened. This further ensures the technical effect of simple structure, relatively low material cost, and convenient and quick processing, installation, and docking.

[0013] Furthermore, multiple mechanical joint devices are present at the joint of adjacent precast concrete pile sections, evenly distributed along the same circle. This structure ensures that the joint between the upper and lower precast concrete pile sections better meets the quality requirements of firmly joined foundation piles such as root-planted piles, exhibiting strong pull-out resistance, good bearing capacity, and stable safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the external structure of the mechanical joint device of this utility model in the docking state.

[0015] Figure 2 This is a longitudinal cross-sectional structural diagram of the docking state of an embodiment of the mechanical joint device of this utility model.

[0016] Figure 3 yes Figure 2A magnified structural diagram of A in the middle.

[0017] Figure 4 yes Figure 2 A magnified structural diagram of B in the diagram.

[0018] Figure 5 This is a longitudinal section diagram of the screw-in portion of an embodiment of the mechanical joint device of this utility model.

[0019] Figure 6 This is an exploded and longitudinal section schematic diagram of an embodiment of the mechanical joint device of this utility model.

[0020] Figure 7 yes Figure 6 A magnified structural diagram of C.

[0021] Figure 8 yes Figure 6 A magnified structural diagram of D in the diagram.

[0022] Figure 9 yes Figure 2 The diagram shows the structure of the mechanical joint device when it is installed on the upper and lower precast concrete piles (both the upper and lower precast concrete piles are drawn with the height omitted, that is, only the lower part of the upper precast concrete pile is shown, and only the upper part of the lower precast concrete pile is shown).

[0023] Figure 10 yes Figure 9 A magnified structural diagram of E in the middle.

[0024] As shown in the figure:

[0025] 1. Upper sleeve; 11. Opening of upper sleeve; 12. Top sleeve; 121. Top plate; 13. Axial limiting ring for steel balls; 14. Bottom end face of upper sleeve; 15. Bottom sleeve.

[0026] 2. Lower sleeve; 21. Opening of lower sleeve; 22. Nut; 221. Spiral guide groove; 222. Top surface of nut; 23. Lower end of lower sleeve; 231. Receiving cavity; 232. Bottom plate of lower sleeve.

[0027] 31. Compression spring; 32. Steel ball; 33. Helical rod; 331. Helical guide bar; 332. Lower end of helical rod;

[0028] 4. Upper section of precast concrete pile; 41. Upper flange; 411. Upper through hole; 412. Bottom face of upper flange; 42. Concrete of upper section of precast concrete pile.

[0029] 5. Lower precast concrete pile, 51. Lower flange, 511. Lower through hole, 512. Top surface of lower flange, 52. Concrete of lower precast concrete pile. Detailed Implementation

[0030] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions of specific embodiments are intended to aid in understanding this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various specific embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0031] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown.

[0032] An embodiment of the mechanical joint device for precast concrete piles of this utility model includes an upper sleeve 1 and a lower sleeve 2, which are fixed at the joint of the precast concrete piles and are coaxial. The opening 11 of the upper sleeve faces downward, and the opening 21 of the lower sleeve faces upward. A compression spring 31 is located inside the upper sleeve 1. The bottom end of the compression spring 31 abuts against a steel ball 32. The steel ball 32 is fixed to the top end of a spiral rod 33, either by welding or by screwing and spot welding. An axial limiting ring 13 for the steel ball is located at the inner bottom end of the upper sleeve 1. It is easy to understand that the top end of the compression spring 31 can directly abut against or indirectly abut against the inner top wall of the upper sleeve 1. This embodiment is... Figure 2 , Figure 5 and Figure 6 The diagram shows the inner wall of the top plate 121 of the upper sleeve 1, which directly abuts against the inner top wall of the upper sleeve 1, i.e., the top plate 121 of the top sleeve 12 described below. The spiral rod 33 has a spiral guide bar 331, and the upper end of the lower sleeve 2 has a nut 22. The nut 22 contains a spiral guide groove 221 that screws onto the spiral guide bar 331 and is connected to the compression spring 31, causing the spiral rod 33 to rotate downwards as the upper precast concrete pile 4 is pressed linearly downwards. It is easy to understand that the lower end 23 of the lower sleeve contains a cavity 231 for receiving the lower end 332 of the spiral rod 33 after it has rotated into place. The bottom plate 232 of the lower sleeve can be integrally formed with or fixed to the lower end 23 of the lower sleeve, such as by welding or screwing. The lower sleeve 2 contains quick-drying adhesive injected during the connection process. The mechanical joint device is designed such that the bottom end face 14 of the upper sleeve abuts against the top end face 222 of the nut on the lower sleeve 2, and the spiral rod 33 is fixed by adhesive (i.e., fixed by dried quick-drying adhesive) and cannot rotate. The spiral guide strip 331 and the spiral guide groove 221 are axially locked to resist pull-out, thus providing pull-out resistance. The nut 22 at the upper end of the lower sleeve 2 and the lower end 23 of the lower sleeve can be integrally formed, or they can be processed separately and then welded together. The upper sleeve has a split structure, with connections between the split parts.

[0033] The cross-section of the helical guide strip 331 of the screw rod 33 is preferably semi-circular, and the cross-section of the helical guide groove 221 of the nut 22 is preferably triangular or trapezoidal. That is, the helical guide strip 331 of the screw rod 33 and the helical guide groove 221 of the nut 22 are in point contact, meaning the screw slides down along the helical line rather than along the helical surface. This results in less resistance and facilitates the conversion of axial thrust into smooth rotational motion, making it easier, more flexible, and faster for the helical guide strip 331 of the screw rod 33 to rotate down along the helical guide groove 221 of the nut 22. Of course, a semi-circular helical guide strip 331 can also be used with a semi-circular helical guide groove, or a trapezoidal helical guide strip can be used with a trapezoidal helical guide groove, etc. However, the preferred embodiment described in this paragraph is preferred.

[0034] The helical guide strip 331 of the helical rod 33 is preferably a single-start helical guide strip 331, or a single-start thread, and the helical guide groove 221 of the nut 22 is preferably a single-start helical guide groove 221, or a single-start thread. The pitch of both the helical guide strip 331 and the helical guide groove 221 of the nut 22 can be 10-15 times the pitch of a common thread. In other words, the pitch of the helical guide strip 331 of the helical rod 33 can be 10-15 times the pitch of a common thread; the pitch of the helical guide groove 221 of the nut 22, which engages with the helical guide strip 331 of the helical rod 33, can also be 10-15 times the pitch of a common thread. The common thread includes, for example, a common arc thread, a common triangular thread, or a common trapezoidal thread. It is easy to understand that, compared to the coarse pitch of a single-threaded ordinary metric thread of the same diameter, such as the typical pitch of a coarse metric thread with a diameter of 18mm being 2.5mm, the pitch of the spiral guide bar 33 and the spiral guide groove of this invention can be 25-37.5mm. In simpler terms, the single-threaded spiral guide bar 331 has a steeper helix, making it easier to convert axial thrust into smooth rotational motion, allowing the spiral guide bar 331 of the spiral rod 33 to rotate more easily, flexibly, and quickly along the spiral guide groove 221 of the nut 22. Of course, a pitch outside the above range is also possible, but the pitch described in this paragraph is preferred. The single-threaded spiral guide bar 331 described in this paragraph is also preferred.

[0035] The upper sleeve 1 is a split structure, with the split parts connected to each other. As described below, the upper sleeve 1 is divided into a top sleeve 12 and a bottom sleeve 15. Alternatively, the steel ball axial limiting ring and the upper sleeve can be separate parts, or the upper sleeve and a bottom sleeve with a steel ball axial limiting ring at the bottom end can be separate parts, etc.

[0036] The upper sleeve 1 is preferably connected to its constituent parts in a detachable manner, such as by threaded connections or flange connections via bolts and nuts. Of course, non-detachable connections, such as welding, are also possible, but detachable connections are preferred.

[0037] In this embodiment, the upper sleeve 1 is preferably divided into the top sleeve 12 and the bottom sleeve 15 as described above. The top sleeve 12 is provided with a top plate 121, and the top sleeve 12 and the bottom sleeve 15 can be screwed together by internal and external threads. For example, the internal thread at the bottom of the top sleeve 12 is screwed and fixed to the external thread at the top of the bottom sleeve 15, and the inner diameter of the top sleeve 12 and the inner diameter of the bottom sleeve 15 can be equal.

[0038] Multiple mechanical joint devices according to this utility model are provided at the joint of two adjacent precast concrete pile sections, and are evenly distributed along the same circle. For example, the mechanical joint devices of the precast concrete pile of this utility model can be evenly distributed along the circumference in the form of 8, 10, or 12 devices.

[0039] The precast concrete pile of this utility model may further include an upper flange 41 and a lower flange 51 for mating. Both the upper flange 41 and the lower flange 51 may be uniformly provided with multiple through holes, such as 8, 10, or 12, along their circumference, as shown in the upper through hole 411 and lower through hole 511. The lower end of the upper sleeve 1 of each mechanical joint device, i.e., the lower end of the bottom cylinder 15, can be welded and fixed in each upper through hole 411. The upper end of the upper sleeve 1 can be pre-embedded in the precast concrete pile, i.e., in the concrete 42 of the upper section of the precast concrete pile, and can be fixed to the longitudinal reinforcing bars in the upper section of the precast concrete pile 4. The upper end of the nut 22 of the lower sleeve 2 can be welded and fixed in each lower through hole 511. The lower end of the nut 22 and the lower end 23 of the lower sleeve can be pre-embedded in the precast concrete pile, i.e., in the concrete 52 of the lower section of the precast concrete pile, and can be fixed to the longitudinal reinforcing bars in the lower section of the precast concrete pile 5. The nut 22 may be polygonal in shape, such as... Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 The regular hexagon shown or the circle not shown in the figure, the diagonal dimension or outer diameter of the nut 22 can be larger than the outer diameter of the upper sleeve 1 and the outer diameter of the lower end 23 of the lower sleeve; the diameter of the lower through hole 511 can be larger than the diameter of the upper through hole 411. When the mechanical joint device of the precast concrete pile of this utility model is in the docking state, the bottom end face 412 of the upper flange and the bottom end face 14 of the upper sleeve can be on the same horizontal plane, and the top end face 512 of the lower flange and the top end face 222 of the nut of the lower sleeve 2 can be on the same horizontal plane. The upper flange 41 and the lower flange 51 after abutting can still be welded to each other. Of course, after using multiple mechanical joint devices of this utility model to dock the upper and lower sections of precast concrete piles, the welding area and workload can be reduced by 1 / 3 to 2 / 3. The flange welding provides double protection, ensuring that the connection between the upper precast concrete pile 4 and the lower precast concrete pile 5 further meets the quality requirements of firmly connected, strong pull-out resistance, good bearing capacity, and stable safety of foundation piles such as root-planted piles.

[0040] Those skilled in the art will understand that the compression spring 31 applies pressure to the movable steel ball 32, i.e., applies an axial downward thrust, causing the helical guide bar 331 of the screw rod 33 to smoothly rotate downward along the helical guide groove 221 of the nut 22, converting the axial force into rotational motion, that is, converting the linear driving force into the rotational motion of the helical pair. This is theoretically feasible. In mechanical engineering, when the screw rod 33, i.e., the screw, is subjected to linear thrust, the screw rod 33, i.e., the screw, will rotate along the helical guide groove 221 of the nut 22 and move downward. This motion mode also has many practical applications in mechanical devices, such as a screw press used in stamping or forging equipment. The motor drives the flywheel to rotate, and the flywheel converts the circular motion into linear thrust through the connecting rod. That is, the connecting rod pushes the top of the screw linearly. After the screw is subjected to linear thrust, because the nut is fixed, it can only rotate downward along the helical guide groove of the nut, driving the stamping head to press the workpiece downward. Another example is an adjustable height support leg used in mechanical equipment. When it is necessary to raise the equipment, a tool is used to press the top of the screw downwards in a straight line. Because the nut is fixed, the screw cannot move directly downwards after being driven by a straight line, but can only rotate downwards relative to the nut.

[0041] It is not difficult to understand that the inventive point of this utility model is not simply to push the helical rod 33, or screw, downward along the nut 22 by linearly pushing it. The inventive point of this utility model is to creatively apply the structure of linearly pushing the helical rod 33, or screw, downward along the nut 22 to the mechanical joint device of precast concrete piles. It creatively designs the compression spring 31, steel ball 32, helical rod 33 fixed with steel ball 32, and nut 22 screwed with helical rod 33, which are sleeved in the upper sleeve 1 and the lower sleeve 2, as well as their positional relationship, connection relationship, and interaction relationship. It creatively proposes a mechanical joint device that connects by linear downward pressure and screwing, which is not found in the prior art. It effectively overcomes the shortcomings of existing mechanical joint devices for precast concrete piles that use elastic tooth meshing, male and female snap-fit, or cross pin insertion. The quick-drying adhesive injected during the connection process allows for rapid connection and also secures the helical rod after connection, preventing it from rotating. The helical guide strip 331 and the helical guide groove 221 engage axially, providing sufficient pull-out resistance. Furthermore, multiple mechanical joint devices of this invention can be installed on the upper and lower precast concrete pile sections 4 and 5, ensuring that the connection between them meets the quality requirements of firmly joined, highly resistant to pull-out, with good bearing capacity and stable safety, similar to root-planted piles.

[0042] The helical rod 33 can be called a screw, the helical guide bar 331 can be called a male thread, and the helical guide groove 221 can be called a female thread. Precast concrete piles are also called precast concrete piles. The compression spring 31 is also called a support spring. The quick-drying adhesive can be commercially available quick-drying epoxy resin or commercially available quick-drying strong adhesive, and it is in toothpaste-like or liquid form when injected.

[0043] Components, structures, or quantities not marked above are not shown in the drawings, and some components are not marked in the drawings. The drawings are for illustrative purposes only. In case of any inconsistency between the drawings and the text description, or between the drawings themselves, the text description shall prevail.

[0044] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mechanical joint device for precast concrete piles, comprising an upper sleeve and a lower sleeve for fixing at the joint of the precast concrete piles and coaxially arranged, wherein the opening of the upper sleeve faces downward and the opening of the lower sleeve faces upward; characterized in that: The upper sleeve contains a compression spring, the bottom end of which abuts against a steel ball. The steel ball is fixed to the top of a spiral rod. The inner bottom end of the upper sleeve has an axial limiting ring for the steel ball. The spiral rod has a spiral guide bar. The upper end of the lower sleeve has a nut. The nut contains a spiral guide groove that is screwed into the spiral guide bar and the compression spring, causing the spiral rod to rotate downward as the upper section of the precast concrete pile is pressed down linearly. The lower sleeve contains quick-drying adhesive injected during the connection. In the connection state, the bottom end face of the upper sleeve abuts against the top end face of the nut on the lower sleeve, and the spiral rod is fixed by the adhesive and cannot rotate, while the spiral guide bar and the spiral guide groove are axially locked to resist pull-out. The upper sleeve is a split structure, and the split parts are connected to each other.

2. The mechanical joint device for precast concrete piles according to claim 1, characterized in that: The cross-section of the helical guide bar of the screw rod is semi-circular, and the cross-section of the helical guide groove of the nut is triangular or trapezoidal.

3. The mechanical joint device for precast concrete piles according to claim 1, characterized in that: The upper sleeve has a detachable connection between its separate parts.

4. The mechanical joint device for precast concrete piles according to claim 3, characterized in that: The upper sleeve is divided into a top sleeve and a bottom sleeve. The top sleeve is equipped with a top plate, and the top sleeve and the bottom sleeve are connected by internal and external threads.

5. The mechanical joint device for precast concrete piles according to claim 1, characterized in that: There are multiple mechanical joint devices at the joint of two adjacent precast concrete pile sections, which are evenly distributed along the same circle.

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