A pile sinking fixing device for pile cap and a pile cap assembly

Abstract

The utility model provides a kind of pile sinking fixing device and pile cap assembly for pile cap, by increasing fixed device, the pile head of different pile is connected with pile cap, to ensure the coaxiality of pile body and pile cap when feeding pile and sinking pile, improve prefabricated square pile feeding efficiency, avoid the deflection of pile body, ensure the perpendicularity of pile body, avoid the damage and fracture of pile head and pile body, ensure the quality of pile. The pile cap has a connecting groove, the pile sinking fixing device includes a transfer disk that can be inlaid with the connecting groove. The transfer disk is used to connect the pile head of the pile body, and the center of the transfer disk is located on the centerline of the pile body.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering construction technology, specifically to a pile cap fixing device and a pile cap assembly. Background Technology

[0002] In the field of civil engineering construction, pile foundations, as a crucial load-bearing structure of buildings and structures, directly affect the safety and stability of the entire project through their construction quality. In the traditional construction process of precast square piles, conventional methods struggle to ensure precise coaxiality between the pile head and the pile cap connection groove, leading to pile deviation during subsequent pile driving and affecting the verticality and stability of the overall structure. Furthermore, the feeding and driving processes can easily cause damage to the pile head, and even pile fracture, severely impacting the quality of the completed pile. Utility Model Content

[0003] The purpose of this utility model is to provide a pile cap fixing device and a pile cap assembly. By adding a fixing device, different pile heads and pile caps can be transferred, thereby ensuring the coaxiality of the pile body and pile cap during pile feeding and driving, improving the pile feeding efficiency of precast square piles, avoiding pile body deviation, ensuring the verticality of the pile body, avoiding damage and breakage of the pile head and pile body, and ensuring the quality of pile formation.

[0004] To achieve the above objectives, this utility model provides a pile driving and fixing device for a pile cap, wherein the pile cap has a connecting groove, and the pile driving and fixing device includes an adapter plate that can be fitted into the connecting groove in a conformal manner; the adapter plate is used to connect the pile head of the pile body, and the center of the adapter plate is located at the centerline of the pile body.

[0005] By using an adapter plate to connect the pile head and pile cap, the shape of the adapter plate conforms to the shape of the connecting groove, and it can also be embedded in the connecting groove. In addition, the center of the adapter plate is located on the center line of the pile body, which can ensure the coaxiality between the pile body, the adapter plate and the pile cap. This ensures the coaxiality of the pile body and the pile cap during pile feeding and driving, avoids pile body deviation, damage and breakage of the pile head and pile body, and ensures the quality of pile formation.

[0006] Optionally, the lower surface of the adapter plate is provided with a connecting structure, which forms an installation cavity for inserting the pile head into the pile body. By providing the installation cavity formed by the connecting structure and inserting it into the pile head, the connection between the pile head and the fixing device is facilitated. At the same time, the corresponding fixing device can be adjusted for different pile bodies, thereby improving the compatibility between the pile cap and the pile body.

[0007] Optionally, the adapter plate is projected axially to form a first projection, and the connecting structure is projected to form a second projection, with the second projection located within the range of the first projection. The first projection formed by the adapter plate covers the second projection formed by the connecting structure (mounting cavity), thus ensuring both compatibility with the pile cap and more uniform force distribution on the pile body during hammering.

[0008] Optionally, the centerline of the pile body extending axially coincides with the centerline of the mounting cavity; the center of the adapter plate is located at the centerline of the mounting cavity. This ensures the coaxiality of the pile body and the adapter plate, and consequently, the coaxiality of the pile cap and the adapter plate.

[0009] Optionally, the connecting structure is adapted to the circumferential anti-rotation mechanism of the pile head. This further prevents pile deflection during pile driving.

[0010] Optionally, the axial projection of the mounting cavity is circular or polygonal. This allows for the adaptation of different connection structures to piles with different radial cross-sections, thereby decoupling the pile head and pile cap and preventing radial gaps between the connection grooves of the pile head and pile cap caused by incomplete fit between different pile heads and pile caps.

[0011] Optionally, the connecting structure has a plurality of vertically arranged, sequentially connected vertical plates on the lower surface of the adapter plate. Each vertical plate has a straight or curved wall and forms the mounting cavity. Each vertical plate is either a separate structure or a single-piece structure. The inner wall of each vertical plate is used to fit against the pile body. This ensures a strong connection between the inner wall of the vertical plate and the pile body.

[0012] Optionally, the device also includes reinforcing angle steel that covers the joint area between two adjacent vertical plates. By using reinforcing angle steel, the number of times the fixing device can be reused can be increased, and the joint area between the vertical plates can be locally reinforced, thereby preventing damage to the connection structure due to excessive local stress.

[0013] Optionally, in the axial direction, the lower surface of the reinforcing angle steel is flush with the lower surface of the vertical plate. That is, by locally reinforcing the joint of the vertical plates with the reinforcing angle steel, extending axially to the lower surface of the vertical plates, the structural strength of the connection structure is further improved.

[0014] Optionally, in the axial direction, the reinforcing angle steel is spaced apart from the lower surface of the adapter plate. By using a spaced-apart reinforcing angle steel, deformation of the adapter plate during repeated use can be avoided, which would otherwise occur if the reinforcing angle steel were in contact with the lower surface of the adapter plate.

[0015] A pile cap assembly includes a lower pile cap and a pile driving and fixing device for the pile cap, wherein the connecting groove is located on the lower surface of the lower pile cap, and the side wall of the adapter plate is radially clearance-fitted with the groove wall of the connecting groove.

[0016] By employing an adapter plate to connect the pile head and pile cap, the adapter plate conforms to the shape of the connecting groove and can be embedded within it. This achieves a radial clearance fit between the sidewall of the adapter plate and the groove wall, avoiding the large radial gap that would result from directly inserting the pile head into the connecting groove. Furthermore, the center of the adapter plate is located on the centerline of the pile body, ensuring coaxiality between the pile body, adapter plate, and pile cap. This guarantees coaxiality between the pile body and pile cap during pile feeding and driving, preventing pile tilting, damage or breakage of the pile head and pile body, and ensuring pile quality.

[0017] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0019] Figure 1 This is a schematic diagram of the fixing device in an embodiment of this utility model, front view;

[0020] Figure 2 yes Figure 1 A bottom view;

[0021] Figure 3 yes Figure 1 Axonometric view;

[0022] Figure 4 This is a structural diagram of the fixing device and the pile body in the connected state.

[0023] Figure label:

[0024] 21-Adapter plate; 22-Connecting structure; 23-Installation cavity; 221-Vertical plate; 24-Reinforcing angle steel; 25-Hanging hole; 1-Pile body. Detailed Implementation

[0025] This utility model provides a pile driving fixing device for pile caps and a pile cap assembly. By adding a fixing device, different pile heads and pile caps can be transferred, thereby ensuring the coaxiality of the pile body and pile cap during pile feeding and driving, avoiding pile body deviation, damage and breakage of the pile head and pile body, and ensuring the quality of pile formation.

[0026] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Relational terms such as “first” and “second” are used merely to distinguish one component from another that has the same name, without necessarily requiring or implying any such actual relationship or order between the components.

[0028] Please refer to Figures 1 to 4 As shown, Figure 1 This is a schematic diagram of the fixing device in an embodiment of this utility model, front view; Figure 2 yes Figure 1 A bottom view; Figure 3 yes Figure 1 Axonometric view; Figure 4 This is a structural diagram of the fixing device and the pile body in the connected state.

[0029] The pile cap body includes an upper pile cap and a lower pile cap arranged axially. A hammer pad and a buffer pad are provided between the upper and lower pile caps. The hammer pad is connected to the upper pile cap by a spring washer, a nut, and screws, and the upper pile cap is used to connect the pile hammer. The buffer pad is installed to the lower pile cap by a nut and screws, and the lower pile cap is used to connect to the pile body 1. Specifically, the lower surface of the lower pile cap is provided with a connecting groove (not shown in the figure), which is formed by the axial upward indentation of the lower surface of the lower pile cap. The connecting groove of the lower pile cap has a fixed shape and fixed size. Generally, the radial cross-section of the connecting groove of the lower pile cap is circular.

[0030] During the pile feeding and driving process, the pile head of pile body 1 is inserted axially into the connecting groove and abuts against the bottom wall of the groove. However, due to the different radial cross-sectional shapes and dimensions of pile bodies 1 (e.g., square, triangular, pentagonal, or round piles), even if pile body 1 is round, the radial dimensions of round piles are not uniform. Thus, after a square pile, triangular pile, or round pile with a radial dimension smaller than the connecting groove is inserted into the connecting groove, there is a significant gap between the sidewall of the pile head and the groove wall in the radial direction.

[0031] Before driving pile 1, a winch is first used to lift pile 1. The winch's wire rope is used to secure the pile, thus lifting and feeding pile 1 to the predetermined pile position. During feeding, the verticality is manually controlled using a theodolite, and then the pile driver operator is manually directed to move the lifted pile 1 to the center of the pile position. A significant gap exists between the sidewall of the pile head and the trench wall, which can have a considerable negative impact during both feeding and driving, thus affecting the quality of the pile foundation.

[0032] On the one hand, during the pile feeding process, the large gap between the side wall of the pile head and the trench wall affects the coaxiality of the pile feeding. In other words, the large gap between the side wall of the pile head and the trench wall causes the pile head to slide radially within the connecting trench. This makes it impossible to ensure that the center line of the pile body 1 and the center line of the pile cap are not on the same axis during pile feeding.

[0033] To avoid such situations, traditional methods require manual observation and adjustment using a theodolite after pile feeding and before hammering. However, even with minimal error reduction, this method still introduces some error. Due to the gap between the pile head and the connecting trench wall, it's impossible to completely prevent the pile head from shifting within the trench during driving. This results in pile tilting and inconsistent overall orientation after pile formation. Insufficient pile verticality prevents proper pile driving and can lead to pile breakage or pile head fracture. Furthermore, if the pile is not aligned with adjacent piles after driving, this overall inconsistency in orientation can cause misalignment of the pile cap, affecting the quality of pile formation and the overall performance of the pile foundation.

[0034] On the other hand, during the pile driving process, the large gap between the side wall of the pile head and the trench wall can cause the impact force of the pile hammer to be unevenly transmitted to the pile body when the pile hammer hits the pile, resulting in excessive local stress on the pile head and breakage.

[0035] To solve at least one of the above problems, such as Figures 1 to 3 As shown, this utility model provides a pile driving fixing device for pile caps. The pile driving fixing device includes an adapter plate 21 that can be fitted into a connecting groove. The adapter plate 21 is used to connect the pile head of the pile body 1 and is arranged perpendicular to the height direction of the pile body 1. The center of the adapter plate 21 is located at the center line of the pile body 1.

[0036] "Matching shape" means that the shape of the adapter plate 21 is consistent with the shape of the connecting groove of the pile cap. "Embedded" means that the adapter plate 21 can be embedded in the connecting groove and has a clearance fit with the connecting groove. This clearance ensures that the adapter plate 21 can be properly inserted into the connecting groove without causing radial misalignment relative to the connecting groove, or the misalignment is so small that it does not affect the coaxiality of the pile body 1 and the pile cap. For example, this clearance can be less than or equal to 10mm, which ensures both easy embedding of the adapter plate 21 into the connecting groove and the coaxiality of the pile body 1 and the pile cap.

[0037] The connection between the pile head and the pile cap is achieved by using an adapter plate 21. The shape of the adapter plate 21 conforms to the shape of the connection groove, and it can also be embedded in the connection groove. In addition, the center of the adapter plate 21 is located at the center line of the pile body 1, which can ensure the coaxiality between the pile body 1, the adapter plate 21 and the pile cap. This ensures the coaxiality of the pile body 1 and the pile cap during pile feeding and driving, avoids the tilting of the pile body 1, damage and breakage of the pile head and the pile body 1, and ensures the quality of pile formation.

[0038] In this embodiment, a connecting structure 22 is provided on the lower surface of the adapter plate 21, which forms an installation cavity 23 for inserting the pile head of the pile body 1. Alternatively, the adapter plate 21 can be directly welded to the upper surface of the pile head, in addition to providing the connecting structure 22. Those skilled in the art can choose according to their needs.

[0039] By setting the installation cavity 23 formed by the connecting structure 22 to be inserted into the pile head, the connection between the pile head and the fixing device is facilitated. At the same time, the corresponding fixing device can be adjusted for different pile bodies 1, thereby improving the compatibility between the pile cap and the pile body 1.

[0040] In this embodiment, such as Figure 4 As shown, the centerline of the pile body 1 extending axially coincides with the centerline of the mounting cavity 23; the center of the adapter plate 21 is located at the centerline of the mounting cavity 23. Here, the centerline of the pile body 1 refers to the line extending axially and passing through the center of the cross-section of the pile body 1, and the centerline of the mounting cavity 23 refers to the line extending axially and passing through the center of the cross-section of the mounting cavity 23. Here, axial direction refers to the vertical direction of the pile body 1 during pile driving. This ensures the coaxiality of the pile body 1 and the adapter plate 21, and consequently, the coaxiality of the pile cap and the adapter plate 21.

[0041] The connecting structure 22 has several vertical plates 221 arranged vertically on the lower surface of the adapter plate 21, which are connected in sequence. The vertical plates 221 are perpendicular to the lower surface of the adapter plate 21. The vertical plates 221 are straight or curved walls, and the vertical plates 221 form an installation cavity 23. Each vertical plate 221 is a split structure or an integrally formed structure. The inner wall of the vertical plate 221 is used to fit against the pile body 1.

[0042] Specifically, the axial projection of the mounting cavity 23 is circular or polygonal. Therefore, different connection structures 22 can be adapted to piles 1 with different radial cross-sections, thereby decoupling the pile head and pile cap and avoiding radial gaps between the connection grooves of the pile head and pile cap caused by incomplete fit between different pile heads and pile caps.

[0043] Specifically, the vertical plates 221 are straight walls and can be connected sequentially around the center line of the pile body 1 to form a triangular, square, or pentagonal mounting cavity 23, etc. Of course, the vertical plates 221 can also be curved panels to form a circular mounting cavity 23.

[0044] As an optional solution, the fixing device also includes a reinforcing angle steel 24. When the vertical plate 221 is a straight wall, the reinforcing angle steel 24 has an L-shaped structure and is located on the outside of the connecting structure 22. Part of the reinforcing angle steel 24 is fixed to one of the two adjacent vertical plates 221, and part is fixed to the other. The reinforcing angle steel 24 covers the joint area of ​​the two adjacent vertical plates 221. The corner of the reinforcing angle steel 24 is flush with the joint area of ​​the two adjacent vertical plates 221. By using the reinforcing angle steel 24, the number of times the fixing device can be reused can be increased, and the joint area of ​​the vertical plates 221 can be locally reinforced, thereby preventing damage to the connecting structure 22 due to excessive local stress.

[0045] In a specific example, the lower surface of the reinforcing angle steel 24 is flush with the lower surface of the vertical plate 221 in the axial direction. That is, the structural strength of the connection structure 22 is further improved by the local reinforcement of the joint position of the reinforcing angle steel 24 extending axially to the lower surface of the vertical plate 221.

[0046] In another specific example, in the axial direction, the reinforcing angle steel 24 is spaced apart from the lower surface of the adapter plate 21. By using a spaced-apart method between the reinforcing angle steel 24 and the lower surface of the adapter plate 21, deformation of the adapter plate 21 during repeated use can be avoided, which would otherwise occur if the reinforcing angle steel 24 were in contact with the lower surface of the adapter plate 21.

[0047] In some other embodiments of this application, the adapter plate 21 is projected axially to form a first projection, and the connecting structure 22 is projected to form a second projection, with the second projection located within the range of the first projection. The second projection is the projection range of the mounting cavity 23. The first projection formed by the adapter plate 21 covers the second projection formed by the connecting structure 22 (mounting cavity 23), thus ensuring that it can be adapted to the pile cap and that the force on the pile body 1 is more uniform when the pile hammer is used.

[0048] In the various embodiments described above, the connecting structure 22 is adapted to prevent rotation of the pile head in the circumferential direction. This further prevents the pile body 1 from deflecting during the pile driving process.

[0049] When the connecting structure 22 forms a polygonal structure, after the pile head is inserted into the mounting cavity 23, it can form a circumferential anti-rotation fit with the connecting structure 22. When the connecting structure 22 forms a circular mounting cavity 23 to fit a round pile, one of the outer side wall of the pile head and the inner side wall of the vertical plate 221 is provided with a locking protrusion and the other is provided with a locking recess, so that they can be locked together radially to form a circumferential anti-rotation fit.

[0050] In another aspect of this application, a pile cap assembly is also provided, including a lower pile cap and a pile driving fixing device for the pile cap, wherein a connecting groove is located on the lower surface of the lower pile cap, and the side wall of the adapter plate 21 is radially clearance-fitted with the groove wall of the connecting groove.

[0051] In a more specific embodiment, a circular adapter plate 21 with the same diameter as the pile cap is made of 12mm thick NM500 high-strength wear-resistant steel plate. The radial dimension of the adapter plate 21 is approximately the same as the radial dimension of the connecting groove. The adapter plate 21 and the groove wall of the connecting groove have a gap of less than 10mm in the radial direction, so that the two can fit together with a gap. This ensures that the adapter plate 21 can be easily inserted into the connecting groove, but will not be radially misaligned relative to the connecting groove.

[0052] In the example shown in the figure, the adapter plate 21 also has two hanging holes 25 that are symmetrical about the center, so that it can be hooked with the hook on the winch. The hanging holes 25 can be through holes with a diameter of 50mm.

[0053] The vertical plate 221 can be formed into a square connecting structure 22 using 8mm thick NM500 high-strength wear-resistant steel plates. The reinforcing angle steel 24 used at the transition position of the vertical plate 221 can be L50*50*6 angle steel welded for reinforcement. The dimension between two opposing vertical plates 221 is larger than the dimension of the pile body 1 in the same direction, with a dimension difference of 10mm. The connecting structure 22 and the circular transition plate 21 are welded together using BTHT1 wear-resistant steel welding rods.

[0054] NM500 high-strength wear-resistant steel plate has high wear resistance and good impact performance. The welding between steel plates uses BTHT1 wear-resistant steel welding rods. These welding rods have good plasticity and toughness. The welding process does not require complicated preheating and heat preservation procedures. The weld will not crack. It is simple to manufacture and has a high reusability.

[0055] As a more specific embodiment, for example, the diameter of the connecting groove is 800mm, and an adapter plate 21 is made according to the radial dimension of the connecting groove. The radial dimension of the adapter plate 21 is 790mm, and 50mm hanging brackets are set on both sides of the adapter plate 21. The side length of the square pile is 450mm, the dimension between the two vertical plates 221 of the connecting structure 22 is 460mm, and the axial dimension of the vertical plate 221 is 150mm. Thus, the finished fixing device weighs approximately 65kg, and is installed onto the pile head using a pile driver winch in conjunction with manual labor. Installation is simple and quick during actual on-site construction. In this embodiment, once the side length of the precast square pile is determined, mass production is possible, and it can be used for square piles of different side lengths, resulting in high efficiency.

[0056] By employing an adapter plate 21, the connection between the pile head and the pile cap is achieved. The adapter plate 21 conforms to the shape of the connection groove and can also be embedded within it. This allows for a radial clearance fit between the sidewall of the adapter plate 21 and the groove wall, avoiding the situation where a large radial gap would occur if the pile head were directly inserted into the connection groove. Furthermore, the center of the adapter plate 21 is located on the centerline of the pile body 1, ensuring coaxiality between the pile body 1, the adapter plate 21, and the pile cap. This guarantees the coaxiality of the pile body 1 and the pile cap during pile feeding and driving, preventing pile body 1 from tilting, damage or breakage of the pile head and pile body 1, and ensuring the quality of pile formation.

[0057] In actual operation, the fixing device in this application is first fitted onto the pile head of the pile body 1, and then the pile body is lifted and fed into the pile cap assembly by steel wire rope, that is, the adapter plate 21 is embedded into the connecting groove of the lower pile cap. After the pile cap feeds the pile, the pile head can not only fix the pile body 1 and reduce rotation under the constraint of the fixing device, but also play a certain role in protecting the pile head. It also plays a certain role in ensuring the verticality of the pile body when hammering and sinking, thus ensuring the quality of pile formation.

[0058] In addition, before feeding the pile, the fixing device is placed on the pile head to prevent the pile head from directly contacting the pile cap, thus dispersing some of the hammering force and providing a certain buffering effect to the pile head. This is convenient to use and can protect the pile head from damage to a certain extent. Connecting the fixing device to the pile head before feeding the pile makes the feeding process faster and shortens the pile driving time.

[0059] The device's adapter plate 21 is adapted to the connecting groove of the pile cap after feeding the pile and before driving it. The connecting structure 22 welded under the adapter plate 21 is suitable for the precast pile 1 to be constructed. After feeding the pile, the pile 1 is not easy to rotate under the fixation of the device, which avoids the pile body from tilting and failing to meet the verticality requirements, and also avoids the pile body from rotating and causing it to be out of line with the adjacent pile after completion.

[0060] Compared with existing technologies, the advantages of this application are:

[0061] First, the fixing device is easy to manufacture, made of materials with good wear resistance and impact resistance, and has a high reusability.

[0062] Secondly, once the fixing device is manufactured, it is simple and convenient to install during actual on-site construction, and it is highly operable.

[0063] Third, once the dimensions of the precast pile body 1 are determined, it can be mass-produced and can be used for square piles with different side lengths, which is highly efficient.

[0064] Fourth, the pile head is protected during pile construction, and the precast square pile after pile construction is aligned with the adjacent pile edge, thus ensuring quality.

[0065] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A pile driving fixing device for pile caps, characterized in that, The pile cap has a connecting groove, and the pile driving fixing device includes a transition plate (21) that can be embedded in the connecting groove; the transition plate (21) is used to connect the pile head of the pile body (1), and the center of the transition plate (21) is located at the center line of the pile body (1).

2. The pile cap fixing device according to claim 1, characterized in that, The lower surface of the adapter plate (21) is provided with a connecting structure (22), which forms an installation cavity (23) for inserting the pile head of the pile body (1); The adapter plate (21) is projected along the axial direction to form a first projection, and the connecting structure (22) is projected to form a second projection, the second projection being located within the range of the first projection.

3. The pile cap fixing device according to claim 2, characterized in that, The centerline of the pile body (1) extending along the height direction coincides with the centerline of the mounting cavity (23); the center of the adapter plate (21) is located at the centerline of the mounting cavity (23).

4. The pile cap fixing device according to claim 3, characterized in that, The connecting structure (22) is adapted to prevent rotation of the pile head in the circumferential direction.

5. The pile cap fixing device according to claim 4, characterized in that, The projection of the mounting cavity (23) along the axial direction is circular or polygonal.

6. The pile cap fixing device according to claim 5, characterized in that, The connecting structure (22) has a plurality of vertical plates (221) arranged vertically on the lower surface of the adapter plate (21) and connected in sequence. The vertical plates (221) are straight walls or curved walls and form the mounting cavity (23). Each vertical plate (221) is a split structure or an integrally formed structure. The inner wall of the vertical plate (221) is used to fit against the pile body (1).

7. The pile cap fixing device according to claim 6, characterized in that, It also includes a reinforcing angle steel (24) that covers the position where two adjacent vertical plates (221) meet.

8. The pile cap fixing device according to claim 7, characterized in that, In the axial direction, the lower surface of the reinforcing angle steel (24) is flush with the lower surface of the vertical plate (221).

9. The pile cap fixing device according to claim 7, characterized in that, In the axial direction, the reinforcing angle steel (24) is spaced apart from the lower surface of the adapter plate (21).

10. A pile cap assembly, characterized in that, Includes a lower pile cap and a pile driving fixing device for the pile cap as described in any one of claims 1-9, wherein the connecting groove is located on the lower surface of the lower pile cap, and the side wall of the adapter plate (21) is radially clearance-fitted with the groove wall of the connecting groove.

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