Hollow u-shaped square pile with stiffening ribs and connecting method thereof

Abstract

The application discloses a hollow UHPC square pile with stiffening ribs and a connecting method thereof, which comprises a hollow UHPC square pile with stiffening ribs, and is fixedly connected through cooperation of sleeves, single-side bolts and high-strength grouting materials between the UHPC square piles. The UHPC square pile comprises two UHPCs, an inner thin-walled round steel pipe, stiffening ribs, longitudinal reinforcement, welds, stirrups and end plates. Holes are formed in the stiffening rib steel plates. The end plates are located at the end portions of the UHPCs, and the longitudinal reinforcement passes through the end plates and is resistance-welded with the end plate plugs. The connecting method comprises sleeves, single-side bolts and high-strength grouting materials. The sleeves are connected with the end plates through the single-side bolts, the high-strength grouting materials are grouted between the inner steel pipes and the single-side bolts, and the high-strength grouting materials play an anchoring role on the longitudinal reinforcement. The application has the advantages of reliable connection, high construction efficiency, economy and environmental protection, visual construction process, transparent grouting quality, effective improvement of construction efficiency and guarantee of construction quality, and can significantly improve the bearing capacity of the hollow UHPC square pile.

Description

Technical Field

[0001] This invention belongs to the field of pile connection technology, specifically relating to a hollow UHPC square pile with stiffening ribs and its connection method. Background Technology

[0002] UHPC has advantages such as high strength and high durability, which gives UHPC piles a significant advantage when bearing high loads. It can resist adverse environmental factors such as chemical erosion, abrasion and freeze-thaw cycles, thereby extending the service life of the pipe piles. At the same time, UHPC has a low water-cement ratio and high density, which gives it excellent impermeability and crack control capabilities, helping to improve the overall performance of the piles.

[0003] In engineering, the connection strength and stability between piles directly affect the safety and reliability of the entire structure. Traditional connection methods may not meet the high strength requirements of UHPC piles, and some existing technologies may not be able to fully utilize the high strength advantages of UHPC piles, resulting in insufficient connection strength and affecting the overall load-bearing capacity of the structure. Some connection technologies have complex construction processes, requiring special equipment and process support, which increases the construction difficulty. Summary of the Invention

[0004] The purpose of this invention is to provide a hollow UHPC square pile with stiffening ribs and a connection method thereof, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a hollow UHPC square pile with stiffening ribs, comprising a hollow UHPC square pile with stiffening ribs, and UHPC square piles fixedly connected by a sleeve, a single-sided bolt, and high-strength grout. The UHPC square pile includes two UHPCs, an inner thin-walled circular steel pipe, stiffening ribs, longitudinal reinforcement, welds, stirrups, and an end plate. The inner thin-walled circular steel pipe is installed on the inner side of the UHPC square pile for fixation. The stiffening ribs are uniformly welded to the outer surface of the inner thin-walled circular steel pipe around its circumference. The end plate is connected to the end of the UHPC. The longitudinal reinforcement passes through the end plate and is plug-welded to the end plate. Spiral stirrups are provided on the outer side of the longitudinal reinforcement. The sleeve and the end plate are locked together by a single-sided bolt. The high-strength grout is injected between the inner thin-walled circular steel pipe and the single-sided bolt.

[0006] Preferably, the stiffening ribs are provided with through holes on their surfaces, and the length of the stiffening ribs is 1 / 20 to 1 / 5 of the length of the UHPC pipe pile, so as to realize the connection between the inner thin-walled round steel pipe and the UHPC.

[0007] Preferably, the outer side of one end of the end plate is provided with a horizontal connecting concave surface that allows the sleeve to be welded to the inside of the end plate and kept horizontal. The sleeve is fitted onto the outside of the horizontal connecting concave surface on the end plate and locked in place by a spiral hoop, so that two UHPCs can be connected through the sleeve.

[0008] Preferably, the longitudinal reinforcement is arranged around the UHPC and welded to the inner side of the spiral stirrup.

[0009] Preferably, the high-strength grout is injected into the cavity between the inner thin-walled round steel pipe and the single-sided bolt to anchor the longitudinal reinforcement.

[0010] Preferably, the two UHPCs are connected to the end plate by sleeve 7 and locked with spiral hoops, and then high-strength grout is injected for fixation. The connection between the UHPCs is strengthened by injecting high-strength grout inside the sleeve connection.

[0011] Preferably, the hollow UHPC square pile adopts an outer square and inner circle shape, and the height of the steel pipe extending from the upper end of the UHPC square pile is 1 / 20-1 / 5 of the length of a single UHPC square pile, which can make the connection between the two UHPCs more solid after the high-strength grout is injected into the sleeve 7.

[0012] Preferably, the longitudinal ribs and end plates are welded together and extend 200mm-300mm outward, which makes the connection between the two UHPCs more secure and stable.

[0013] Preferably, the stiffening ribs are welded to the inner thin-walled round steel pipe at intervals of 1 / 20 to 1 / 5 of the length of the UHPC pipe pile, which makes the UHPC pipe pile more stable and firm during connection and use, and allows the connection to be evenly stressed.

[0014] Preferably, the stirrups are locally densified at both ends of a single section of the UHPC square pile to improve the steel plate's resistance to local buckling and extend its service life.

[0015] To achieve the above objectives, the present invention also provides the following technical solution: a method for connecting hollow UHPC square piles with stiffening ribs, wherein an end plate is installed and fixed at one end of a single section of the hollow UHPC square pile with stiffening ribs, and a horizontal connecting concave surface is opened at one end of the end plate.

[0016] The inner thin-walled round steel pipe is installed on the inside of the UHPC square pile for fixation, and the stiffening ribs are evenly welded to the outer surface of the inner thin-walled round steel pipe around the perimeter.

[0017] The longitudinal reinforcement then passes through the UHPC square pile and end plate to the outside, and the longitudinal reinforcement and end plate are connected by plug welding using a welding machine. Spiral stirrups are installed on the outside of the longitudinal reinforcement to lock and fix the sleeve and end plate.

[0018] High-strength grout is injected between the inner thin-walled round steel pipe and the single-sided bolt, and connected to the end plate by the single-sided bolt. High-strength grout is injected into the sleeve and the inner thin-walled round steel pipe.

[0019] The lower end of a single-section hollow UHPC square pile with stiffening ribs is pressed into high-strength grout. The sleeve is connected to the lower end plate of the single-section pile by a single-sided bolt, and the stiffening ribs are non-contactly lapped with the reinforcing bars.

[0020] Compared with the prior art, the technical effects and advantages of the present invention are as follows: The hollow UHPC square pile with stiffening ribs adopts the method of plug welding of steel bars to end plates, anchoring the steel bars with high-strength grouting material, and connecting them through sleeves and grouting. The connection is reliable, the construction efficiency is high, and it is economical and environmentally friendly, which can significantly improve the bearing capacity of the hollow UHPC square pile.

[0021] By first injecting high-strength grout into the UHPC square piles and then using gravity grouting, the grouting quality problems that may be caused by pressure grouting are reduced. The construction process is visualized and the grouting quality is transparent, which can effectively improve construction efficiency and ensure construction quality.

[0022] The stiffening ribs are non-contactly lapped with the reinforcing bars, which improves the force transmission efficiency between the reinforcing bars. The combined effect of the two can significantly enhance the overall performance of the hollow UHPC square pile.

[0023] Perforated steel plates, as connectors between the inner thin-walled round steel tube and the UHPC interface, can enhance the bond strength of the steel tube-UHPC interface. They can also participate in the stress distribution of the steel tube-UHPC section as a component of the steel tube section. Furthermore, they can serve as longitudinal stiffeners to enhance the constraint of the inner thin-walled round steel tube on the UHPC, improve the steel plate's resistance to local buckling, and reduce the amount of steel used. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a hollow UHPC square pile with stiffening ribs provided by the present invention.

[0025] Figure 2 This is a partial schematic diagram of a hollow UHPC square pile connection method with stiffening ribs provided by the present invention.

[0026] Figure 3 A cross-sectional view of a hollow UHPC square pile with stiffening ribs provided for this invention.

[0027] Figure 4 A schematic diagram of a hollow UHPC square pile reinforcement cage with stiffening ribs provided by the present invention.

[0028] Figure 5 This is a schematic diagram of the upper end of a single section of a hollow UHPC square pile with stiffening ribs, provided by the present invention.

[0029] Figure 6 This invention provides a schematic diagram of the lower end of a single-section hollow UHPC square pile with stiffening ribs.

[0030] In the figure: 1. UHPC; 2. Inner thin-walled round steel pipe; 3. Stiffening rib; 4. Longitudinal reinforcement; 5. Weld; 6. End plate; 7. Sleeve; 8. Single-sided bolt; 9. High-strength grout; 10. Stirrup; 11. Hole; 12. Horizontal connection concave surface. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1-3 This invention provides a technical solution: a hollow UHPC square pile with stiffening ribs, comprising a hollow UHPC square pile with stiffening ribs, and UHPC square piles fixedly connected by a sleeve 7, a single-sided bolt 8, and high-strength grout 9. After the UHPC square pile is manufactured, it is not only more solid and stable, but also lighter in weight, reducing material usage costs. The hollow UHPC square pile adopts an outer square and inner round shape, allowing the UHPC square pile to have a larger contact area with the ground when used vertically, making the UHPC square pile support more solid. The height of the inner thin-walled circular steel pipe 2 extending from the upper end of the UHPC square pile is 1 / 20-1 / 5 of the length of a single UHPC square pile, which is conducive to the firm connection between UHPC square piles and ensures the stability of the connection between them.

[0033] The UHPC square pile includes two UHPCs 1, an inner thin-walled round steel pipe 2, stiffening ribs 3, longitudinal reinforcement 4, welds 5, stirrups 10, and end plates 6. The inner thin-walled round steel pipe 2 is installed on the inner side of the UHPC square pile for fixation. The stiffening ribs 3 are uniformly welded around the outer surface of the inner thin-walled round steel pipe 2. Holes 11 are provided through the surface of the stiffening ribs 3 to allow high-strength grout 9 to be injected into the holes 11, which can fix the inner thin-walled round steel pipe. The stiffening ribs 3 are welded to the inner thin-walled round steel pipe 2 at intervals of 1 / 20 to 1 / 5 of the length of the UHPC pipe pile. The length of the stiffening ribs 3 is 1 / 20 to 1 / 5 of the length of the UHPC pipe pile. The end plates 6 are connected to the end of the UHPC 1. The longitudinal reinforcement 4 passes through the end plates 6 and is plug-welded to the end plates 6.

[0034] The longitudinal reinforcement 4 and the end plate 6 are plugged together by weld 5 and extend 200mm-300mm to the outside. The longitudinal reinforcement 4 is set around the UHPC1 and is welded and fixed to the inner side of the spiral stirrup 10. The spiral stirrup 10 is set on the outer side of the longitudinal reinforcement 4. The stirrup 10 is locally densified at both ends of the single section of the UHPC square pile. The sleeve 7 and the end plate 6 are locked together by a single-sided bolt 8. The outer side of one end of the end plate 6 is provided with a horizontal connecting concave surface 12 to keep the sleeve 7 welded to the inside of the end plate 6 and horizontal. The sleeve 7 is sleeved on the outside of the horizontal connecting concave surface 12 on the end plate 6 and locked together by the spiral stirrup 10.

[0035] The high-strength grout 9 is injected between the inner thin-walled round steel pipe 2 and the single-sided bolt 8. After the high-strength grout 9 is injected into the cavity between the inner thin-walled round steel pipe 2 and the single-sided bolt 8, it anchors the longitudinal reinforcement 4. The two UHPC1 are fixed by sleeve 7 on the end plate 6 and locked by spiral stirrup 10. The high-strength grout 9 is then injected to fix them.

[0036] Specifically, in use, the end plate 6 is installed and fixed at one end of the single-section UHPC square pile with stiffening ribs, and a horizontal connecting concave surface 12 is opened at one end of the end plate 6. The inner thin-walled round steel pipe 2 is installed and fixed inside the UHPC square pile. At the same time, the stiffening ribs 3 are evenly welded to the outer surface of the inner thin-walled round steel pipe 2. Then, the longitudinal reinforcement 4 passes through the UHPC square pile and the end plate 6 to the outside, and the longitudinal reinforcement 4 and the end plate 6 are connected by plug welding using a welding machine. Spiral stirrups 10 are set on the outside of the longitudinal reinforcement 4 to lock and fix the sleeve 7 and the end plate 6. After the sleeve 7 and the end plate 6 are fitted and fixed, they are locked and connected by a single-sided bolt 8. High-strength grout 9 is injected between the inner thin-walled round steel pipe 2 and the single-sided bolt 8, and then... A single-sided bolt 8 is connected to the end plate 6. High-strength grout 9 is injected into the sleeve 7 and the inner thin-walled round steel pipe 2. The lower end of the single-section hollow UHPC square pile with stiffening ribs is pressed into the high-strength grout 9. The sleeve 7 is connected to the lower end plate 6 of the single-section pile by the single-sided bolt 8. The stiffening rib 3 is non-contactly lapped with the reinforcing bar, which improves the force transmission efficiency between the reinforcing bars. The two work together to significantly enhance the overall performance of the hollow UHPC square pile. By using the reinforcing bar to be plug-welded to the end plate 6, the reinforcing bar is anchored by the high-strength grout 9 and connected by the sleeve 7 and the grouting. The connection is reliable and the construction efficiency is high. By first injecting the high-strength grout 9 and then splicing the UHPC square pile, the gravity grouting method is used to reduce the grouting quality problems that may be caused by pressure grouting.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hollow UHPC square pile with stiffening ribs, comprising hollow UHPC square piles with stiffening ribs, and UHPC square piles fixedly connected by sleeves (7), single-sided bolts (8), and high-strength grouting material (9), characterized in that: The UHPC square pile includes two UHPCs (1), an inner thin-walled round steel pipe (2), stiffening ribs (3), longitudinal bars (4), welds (5), stirrups (10), and end plates (6). The inner thin-walled round steel pipe (2) is installed on the inner side of the UHPC square pile for fixation. The stiffening ribs (3) are uniformly welded around the outer surface of the inner thin-walled round steel pipe (2). The end plates (6) are connected to the end of the UHPC (1). The longitudinal bars (4) pass through the end plates (6) and are plug-welded to the end plates (6). Spiral stirrups (10) are provided on the outside of the longitudinal bars (4). The sleeve (7) is locked to the end plates (6) by a single-sided bolt (8). The high-strength grout (9) is injected between the inner thin-walled round steel pipe (2) and the single-sided bolt (8). The stiffening ribs (3) are all perforated with holes (11), and the length of the stiffening ribs (3) is 1 / 20 to 1 / 5 of the length of the UHPC pipe pile; The hollow UHPC square pile adopts the form of an outer square and an inner circle. The height of the inner thin-walled circular steel pipe (2) at the upper end of the UHPC square pile is 1 / 20-1 / 5 of the length of a single UHPC square pile. The longitudinal rib (4) and the end plate (6) are plug welded together by weld seam (5) and extend to the outside by 200mm-300mm; The stiffening ribs (3) are welded to the inner thin-walled round steel pipes (2) at intervals of 1 / 20 to 1 / 5 of the length of the UHPC pipe pile, and the stirrups (10) are locally densified at both ends of the single section of the UHPC square pile. The outer side of one end of the end plate (6) is provided with a horizontal connecting concave surface (12) for welding the sleeve (7) to the inside of the end plate (6) to maintain a horizontal plane, and the sleeve (7) is sleeved on the outside of the horizontal connecting concave surface (12) on the end plate (6) and locked by a spiral hoop (10). The longitudinal reinforcement (4) is arranged around the UHPC (1) and welded to the inner side of the spiral stirrup (10); After the high-strength grout (9) is poured into the cavity between the inner thin-walled round steel pipe (2) and the single-sided bolt (8), the longitudinal reinforcement (4) is anchored. The two UHPCs (1) are connected to the end plate (6) by sleeves (7) and locked by spiral hoops (10), and then high-strength grout (9) is injected for fixation; The UHPC square pile with stiffening ribs and hollow structure, and the UHPC square piles are fixedly connected by sleeve (7), single-sided bolt (8), and high-strength grout (9). After the UHPC square pile is prepared, it is not only more solid and stable, but also lighter in weight, reducing the cost of material use. The hollow UHPC square pile adopts an outer square and inner circle shape, which allows the UHPC square pile to contact the ground with a larger area when used vertically, making the UHPC square pile support more solid. The height of the inner thin-walled round steel pipe (2) at the upper end of the UHPC square pile is 1 / 20-1 / 5 of the length of a single UHPC square pile, which is conducive to the solid connection between UHPC square piles and ensures the stability of the connection between the two.

2. A method for connecting hollow UHPC square piles with stiffening ribs, based on the hollow UHPC square pile with stiffening ribs as described in claim 1, characterized in that: Install and fix the end plate (6) at one end of the single section of the hollow UHPC square pile with stiffening ribs, and open the horizontal connecting concave surface (12) at one end of the end plate (6); The inner thin-walled round steel pipe (2) is installed on the inner side of the UHPC square pile and fixed. At the same time, the stiffening ribs (3) are evenly welded to the outer surface of the inner thin-walled round steel pipe (2) around the perimeter. Subsequently, the longitudinal reinforcement (4) passes through the UHPC square pile and the end plate (6) to the outside, and the longitudinal reinforcement (4) and the end plate (6) are connected by plug welding using a welding machine. Spiral stirrups (10) are provided on the outside of the longitudinal reinforcement (4) to lock and fix the sleeve (7) and the end plate (6). High-strength grout (9) is injected between the inner thin-walled round steel pipe (2) and the single-sided bolt (8), and connected to the end plate (6) through the single-sided bolt (8). High-strength grout (9) is injected into the sleeve (7) and the inner thin-walled round steel pipe (2). The lower end of a single-section hollow UHPC square pile with stiffening ribs is pressed into high-strength grout (9), and the sleeve (7) is connected to the lower end plate (6) of the single-section pile by a single-sided bolt (8). The stiffening rib (3) is non-contactly lapped with the reinforcing bar.

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