Multi-section combined precast pile

Abstract

The utility model relates to a multi-section combined precast pile, and relates to the technical field of precast piles, the multi-section combined precast pile comprises a plurality of sub-piles in different shapes, each sub-pile comprises a steel pipe core and a concrete block wrapping the steel pipe core, a positioning ring is integrally fixed to the lower end of the steel pipe core, and a ring groove corresponding to the positioning ring in shape is formed in the upper end of the steel pipe core; the positions of the annular grooves are higher than the top faces of the concrete blocks, the adjacent sub-piles are connected in an inserted mode through the positioning rings and the annular grooves, the outer edges of the contact positions of the positioning rings and the annular grooves are fixed through welding, welding seams are formed through welding, and the welding seams are located between the adjacent concrete blocks. After the pile body is installed in the ground, on the basis of the firmness of a welding seam, the bending resistance of the pile body is remarkably improved through matching of the positioning ring and the ring groove, the welding seam is not prone to cracking when the pile body is subjected to horizontal shearing force, and the pile body is not prone to being broken; a plurality of positioning bulges and positioning grooves are arranged, so that the positioning requirements of concrete blocks in various shapes are met; the EVA foam layer is wound to seal and prevent water for the welding seam and the steel pipe core, and the installation is simple.

Description

Technical Field

[0001] This application relates to the field of precast pile technology, and in particular to a multi-section composite precast pile. Background Technology

[0002] As engineering piles, irregularly shaped piles have different cross-sections at different heights. Multi-section precast piles are generally made up of multiple sub-piles with different cross-sections. The outer surface of such precast piles has multiple concave parts, which can provide greater pull-out resistance after being pressed into contact with soil or concrete.

[0003] Utility model patent CN211312498U discloses a multi-section composite precast pile with a wing plate, which consists of an upper pile body, a grouting hole, an upper wing plate, a middle pile body, a lower pile body, and a pile tip. The upper pile body is a cylinder with a grouting hole in the middle. The upper wing plate is connected to the upper pile body and is of equal length. The middle pile body has a pentagonal irregular steel pipe pile body. The lower pile body is a hollow cylinder with a variable cross-section, and the cross-section at the connection with the middle pile body is a circle inscribed in the irregular shape. Grouting at the pile tip is completed through the grouting hole in the middle of the pile body.

[0004] Regarding the aforementioned technologies, the inventors believe that the different sections of the pile are fixed by welding, and the strength of the weld seam on the outer wall of the pile is insufficient. When the pile is subjected to horizontal shear force, there is a risk of weld seam cracking and pile breakage. Utility Model Content

[0005] This application provides a multi-section composite precast pile, which improves the bending strength of the pile body and reduces the risk of weld cracking by the cooperation of the positioning ring and the ring groove, while also facilitating welding.

[0006] This application provides a multi-section composite precast pile, which adopts the following technical solution:

[0007] A multi-section composite precast pile includes multiple sub-piles of different shapes. Each sub-pil includes a steel core and a concrete block encased in the steel core. The cross-sectional shapes of adjacent concrete blocks are different. A positioning ring is integrally fixed to the lower end of the steel core, protruding from the bottom surface of the concrete block. A groove corresponding to the shape of the positioning ring is formed at the upper end of the steel core, and the groove is positioned higher than the top surface of the concrete block. Adjacent sub-piles are connected by the positioning ring and the groove. The outer edge of the positioning ring at the contact point with the groove is fixed by welding to form a weld. The weld is located between adjacent concrete blocks.

[0008] By adopting the above technical solution, adjacent sub-piles are connected by positioning rings and ring grooves, so that the boundary line of the outer wall of the adjacent steel pipe core is located between adjacent concrete blocks, which facilitates the fixing operation of adjacent steel pipe cores. After the pile body is installed in the ground, based on the strength of the weld, the cooperation of the positioning ring and the ring groove significantly improves the bending resistance of the pile body. When the pile body is subjected to horizontal shear force, the weld is not easy to crack and the pile body is not easy to break.

[0009] Optionally, a positioning protrusion is fixed on the bottom wall of the annular groove, and a positioning groove with a shape corresponding to the positioning protrusion is formed on the bottom wall of the positioning ring.

[0010] By adopting the above technical solution, the positioning protrusion and positioning groove are used to facilitate the positioning of adjacent steel pipe cores, so that the angle and orientation of adjacent concrete blocks are correct.

[0011] Optionally, eight positioning protrusions are evenly distributed along the circumference of the annular groove, and eight positioning grooves are also evenly distributed along the circumference of the positioning ring.

[0012] By adopting the above technical solution, the adjacent positioning protrusions correspond to a 45-degree angle, so the adjacent concrete blocks can be positioned once every 45 degrees of rotation, which is sufficient to meet the positioning needs of concrete blocks of various shapes.

[0013] Optionally, both the positioning protrusion and the positioning groove are hemispherical.

[0014] By adopting the above technical solution, the hemispherical positioning protrusion can be rotated after positioning is completed, which makes it easy to adjust the angle of adjacent concrete blocks.

[0015] Optionally, the weld is wrapped with an EVA foam layer, the width of which is the same as the spacing between adjacent concrete blocks, and the upper and lower sides of the foam layer are in contact with the concrete blocks.

[0016] By adopting the above technical solution, the EVA foam layer has a waterproof function, which is used to prevent external water from contacting the weld seam and steel core, and to prevent the steel core from rusting.

[0017] Optionally, the EVA foam layer is installed outside the weld in a wound manner, and the EVA foam layer is wound in at least three layers.

[0018] By adopting the above technical solution and installing it in a winding manner, the sealing performance is improved through multiple layers of EVA foam.

[0019] Optionally, an adhesive layer is fixed to the inner side of the EVA foam layer.

[0020] By adopting the above technical solution, the EVA foam layer is fixed after being rolled and stacked by the adhesive layer, and it is not easy to fall apart.

[0021] Optionally, no release film or release layer is provided on the outer side of the EVA foam layer.

[0022] By adopting the above technical solution, this structure distinguishes the EVA foam layer from conventional foam tape. Because it does not have a release film or release layer, the EVA foam layer adheres firmly to itself after being rolled and stacked.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. After the pile is installed in the ground, the bending resistance of the pile is significantly improved by the cooperation of the positioning ring and the ring groove, based on the strong weld. The weld is not easy to crack when the pile is subjected to horizontal shear force, and the pile is not easy to break.

[0025] 2. By setting multiple positioning protrusions and positioning grooves, the positioning requirements of concrete blocks of various shapes can be met;

[0026] 3. By wrapping EVA foam layers to seal and waterproof the weld seams and steel pipe core, the materials are readily available and the installation is simple. Attached Figure Description

[0027] Figure 1 This is a perspective view of a multi-section combined precast pile according to an embodiment;

[0028] Figure 2 This is a partial exploded view of an embodiment;

[0029] Figure 3 This is a weld structure diagram of an embodiment;

[0030] Figure 4 This is a schematic diagram of the EVA foam layer and adhesive layer in an embodiment.

[0031] Explanation of reference numerals in the attached drawings: 1. Sub-pile; 2. Steel pipe core; 3. Concrete block; 21. Positioning ring; 22. Ring groove; 4. Weld; 23. Positioning protrusion; 24. Positioning groove; 5. EVA foam layer; 51. Adhesive layer. Detailed Implementation

[0032] The present application will be further described in detail below with reference to the accompanying drawings.

[0033] Reference Figure 1 This embodiment discloses a multi-section composite precast pile, including multiple sub-piles 1 of different shapes. Each sub-pile 1 includes a steel core 2 and a concrete block 3 wrapped around the steel core 2. The cross-sectional shapes of adjacent concrete blocks 3 are different, and the cross-section of the concrete block 3 can be any shape such as rectangular, circular or polygonal.

[0034] Reference Figure 2 and Figure 3A positioning ring 21 is integrally fixed at the lower end of the steel pipe core 2. The positioning ring 21 protrudes from the bottom surface of the concrete block 3. A ring groove 22 with a shape corresponding to the positioning ring 21 is opened at the upper end of the steel pipe core 2. The position of the ring groove 22 is higher than the top surface of the concrete block 3. Adjacent sub-piles 1 are connected by the positioning ring 21 and the ring groove 22. Then the outer wall boundary line of the adjacent steel pipe core 2 is located between the adjacent concrete blocks 3, which facilitates the fixing operation of the adjacent steel pipe core 2.

[0035] The outer edge of the contact point between the positioning ring 21 and the ring groove 22 is fixed by welding, forming a weld 4, which is located between adjacent concrete blocks 3. The welding method provides greater stability than conventional detachable connection methods. Since the weld 4 is exposed, it is easy for personnel or robots to perform welding. The standard circular shape of the weld 4 also facilitates welding operations.

[0036] A positioning protrusion 23 is fixed on the bottom wall of the annular groove 22, and a positioning groove 24 with a shape corresponding to the positioning protrusion 23 is formed on the bottom wall of the positioning ring 21. Both the positioning protrusion 23 and the positioning groove 24 are hemispherical. Eight positioning protrusions 23 are evenly distributed along the circumference of the annular groove 22, and eight positioning grooves 24 are also evenly distributed along the circumference of the positioning ring 21. The cooperation of the positioning protrusions 23 and the positioning grooves 24 facilitates the positioning of adjacent steel pipe cores 2. The hemispherical positioning protrusions 23 allow for rotation after positioning, facilitating the adjustment of the angle of adjacent concrete blocks 3. With eight circumferentially distributed positioning protrusions 23 and positioning grooves 24, and adjacent positioning protrusions 23 corresponding to a 45-degree angle, adjacent concrete blocks 3 can be positioned once every 45 degrees of rotation, which is sufficient to meet the positioning requirements of concrete blocks 3 of various shapes.

[0037] The weld 4 is wrapped with an EVA foam layer 5. The width of the EVA foam layer 5 is the same as the spacing between adjacent concrete blocks 3, and the top and bottom sides of the foam layer are in contact with the concrete blocks 3. The EVA foam layer 5 is installed on the outside of the weld 4 in a winding manner, and there are at least three layers of EVA foam layer 5. The EVA foam layer 5 has a waterproof function to prevent external water from contacting the weld 4 and the steel pipe core 2, and to prevent the steel pipe core 2 from rusting.

[0038] Reference Figure 4 An adhesive layer 51 is fixed to the inner side of the EVA foam layer 5, while no release film or release layer is provided on the outer side of the EVA foam layer 5. This structure distinguishes the EVA foam layer 5 from conventional foam tapes. Because it lacks a release film or release layer, the EVA foam layer 5 can adhere to itself after being wound and stacked, resulting in a high degree of firmness. The multi-layered EVA foam layer 5 improves sealing performance, and the EVA foam layer 5 is readily available and easy to install.

[0039] The implementation principle of a multi-section composite precast pile according to an embodiment of this application is as follows: Each sub-pile 1 is prefabricated. Before assembly, the bottom pile at the bottom end of the pile body does not have a positioning ring 21, the bottom surface of the bottom pile is concrete, and the steel core 2 is not exposed on the bottom surface of the pile body. When assembling the sub-pile 1 on the bottom pile, the adjacent steel core 2 is combined by inserting the positioning ring 21 into the ring groove 22. The circumferential position of the concrete block 3 is positioned by the positioning protrusion 23 and the positioning groove 24. The adjacent steel core 2 is fixed by welding to form a weld 4. The weld 4 and the steel core 2 are sealed and waterproofed by wrapping with EVA foam layer 5.

[0040] After the pile is installed in the ground, based on the firmness of weld 4, the bending resistance of the pile is significantly improved by the cooperation of positioning ring 21 and ring groove 22. When the pile is subjected to horizontal shear force, weld 4 is not easy to crack and the pile is not easy to break.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-section composite precast pile, comprising multiple sub-piles of different shapes (1), characterized in that: The sub-pile (1) includes a steel core (2) and a concrete block (3) wrapped around the steel core (2). The cross-sectional shapes of the upper and lower adjacent concrete blocks (3) are different. A positioning ring (21) is integrally fixed at the lower end of the steel core (2). The positioning ring (21) protrudes from the bottom surface of the concrete block (3). A ring groove (22) with a shape corresponding to the positioning ring (21) is opened at the upper end of the steel core (2). The position of the ring groove (22) is higher than the top surface of the concrete block (3). Adjacent sub-piles (1) are connected by the positioning ring (21) and the ring groove (22). The outer edge of the contact position between the positioning ring (21) and the ring groove (22) is fixed by welding to form a weld (4). The weld (4) is located between adjacent concrete blocks (3).

2. The multi-section composite precast pile according to claim 1, characterized in that: The bottom wall of the annular groove (22) is fixed with a positioning protrusion (23), and the bottom wall of the positioning ring (21) is provided with a positioning groove (24) whose shape corresponds to the positioning protrusion (23).

3. A multi-section composite precast pile according to claim 2, characterized in that: The positioning protrusions (23) are evenly distributed in eight directions along the circumference of the annular groove (22), and the positioning grooves (24) are also evenly distributed in eight directions along the circumference of the positioning ring (21).

4. A multi-section composite precast pile according to claim 2, characterized in that: The positioning protrusion (23) and positioning groove (24) are both hemispherical.

5. A multi-section composite precast pile according to claim 1, characterized in that: The weld (4) is wrapped with an EVA foam layer (5), the width of which is the same as the spacing between adjacent concrete blocks (3), and the upper and lower sides of the foam layer are in contact with the concrete blocks (3).

6. A multi-section composite precast pile according to claim 5, characterized in that: The EVA foam layer (5) is installed outside the weld (4) in a winding manner, and the EVA foam layer (5) has at least three layers.

7. A multi-section composite precast pile according to claim 5, characterized in that: An adhesive layer (51) is fixed to the inner side of the EVA foam layer (5).

8. A multi-section composite precast pile according to claim 7, characterized in that: The outer side of the EVA foam layer (5) is not provided with a release film or release layer.

Images