Steel pipe static pressure pile splicing joint

Abstract

The utility model relates to the field of steel pipe static pressure pile splicing, and aims at providing a steel pipe static pressure pile splicing joint which comprises a plurality of steel pipe pile inner inserting pipes which are vertically pressed into a soil body, and the steel pipe pile inner inserting pipes are sequentially and longitudinally spliced. A steel retaining pipe used for controlling the perpendicularity of a joint is arranged at the splicing joint of any two adjacent steel pipe pile inner inserting pipes, each steel retaining pipe comprises two semicircular half-pipe inner inserting pipes with opposite openings, and the upper portions of the semicircular half-pipe inner inserting pipes are fixedly connected to the inner walls of the corresponding upper side steel pipe pile inner inserting pipes. And the lower end of the semicircular half-pipe inner insertion pipe is inserted into a pipe cavity of the lower side steel pipe pile inner insertion pipe in an aligned manner. The utility model has the advantages of better bearing capacity and stability, stronger durability and wider application range, not only can ensure the safety and reliability of the splicing node, but also can obviously improve the field construction efficiency, thereby reducing the construction period and the construction cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of steel pipe static pile splicing, in particular to a steel pipe static pile splicing joint. BACKGROUND

[0002] Steel pipe static pile is a commonly used and mature pile foundation type, which uses static pressure pile process to press the prefabricated steel pipe into the soil section by section, has the advantages of simple operation, reliable construction quality, small noise, less vibration and the like, and is widely used in the fields of new engineering projects, existing building layer increasing reconstruction, foundation underpinning, existing building deviation rectification and the like.

[0003] The steel pipe static pile of the conventional length has good applicability to the general soft soil foundation, but in the regions of Fuzhou, Shanghai, Ningbo, Guangzhou and the like with particularly deep soft soil layers, the steel pipe static pile length needs to be particularly lengthened so that the pile end penetrates the soft soil layer and enters a certain depth of better bearing stratum. Limited by the site space, the processing plant manufacturing level and the on-site hoisting capacity, the whole steel pipe is often difficult to be manufactured and pressed in at one time in the actual construction, and the segmented pressing and the section-by-section splicing construction process is usually needed. The splicing joint formed in the process not only affects the effective exertion of the pile body bearing capacity and the stable and reliable transmission of the upper load, but also greatly affects the on-site construction efficiency, and further affects the construction period and cost according to whether the joint construction is convenient or not.

[0004] Traditional steel pipe splicing methods include flange connection or butt welding, but both have certain problems. The flange connection has complex manufacturing process and high cost, and the flange diameter is large, which is difficult to be lowered into the hole with small diameter. The butt welding is equal cross-section splicing, but it is difficult to completely align the upper and lower section piles during welding, and the perpendicularity is difficult to guarantee. At the same time, the weld joint is relatively weak, which is easy to become a potential damage position. In view of the above shortcomings, the utility model patent with patent number CN 222044175 U (patent name: a steel pipe pile splicing structure) and the utility model patent with patent number CN 212053205 U (patent name: an equal cross-section steel pipe field splicing structure) have made improvements and innovations. The biggest innovation is to use an inner pipe to connect the upper and lower section piles, which ensures the perpendicularity of the pile body under the premise of not increasing the outer diameter of the steel pipe, and enhances the anti-deformation ability of the joint. The above-mentioned patents still have the following obvious shortcomings: first, the bearing capacity and overall stability are poor. The above process needs to open holes in the steel pipe pile body at many places, and the firm connection between the steel pipe pile and the inner pipe is achieved by plug welding at the opening. However, the large number of openings will not only damage the material continuity of the pile body, but also make the stress distribution of the steel pipe pile under the action of the upper load extremely uneven, and especially easy to concentrate at the plug welding seam, which will increase the possibility of strength damage of the steel pipe pile. In addition, the opening greatly weakens the cross-sectional area of the pile body, and under the premise that the cross-sectional area is not effectively reinforced, the bearing capacity and overall stability of the steel pipe pile body will be greatly reduced.

[0005] Second, the durability is poor. As a pile foundation, the design working life of the steel pipe static pressure pile is not less than 50 years. Before the steel pipe leaves the factory, it needs to be coated with a corrosion-resistant coating on the outer wall according to the design environment requirements to ensure the durability of the pile foundation. However, the above process needs to open holes in the pile body, which not only damages the corrosion-resistant coating of the pile body, but also causes the hole wall of the pile body to be directly exposed to the external environment without corrosion treatment. Under the continuous action of the corrosive environment, the steel pipe pile is prone to corrosion damage, which will greatly weaken the cross-sectional area of the pile body and greatly reduce the strength and durability of the pile body.

[0006] Third, the applicable scope is small. The above process needs to open holes and weld the upper and lower section piles with the inner pipe after the completion of the whole, which is not suitable for areas with limited space, such as existing buildings, existing bridge beam bottom, etc.

[0007] With the acceleration of urban renewal, more and more existing buildings need to be reinforced, underpinned or added to the layer, which provides a broad stage for the application of steel pipe static pressure pile. However, how to efficiently and reliably complete the splicing of the steel pipe static pressure pile in a small space or low clearance condition, and break through this key technical bottleneck, is of great significance to the development of steel pipe static pressure pile in the field of engineering construction. Utility model content

[0008] The utility model disc purposes to provide a kind of steel pipe static pressure pile splicing node, its bearing capacity and stability are better, durability is stronger, more widely applicable, not only can ensure the safety and reliability of splicing node, simultaneously can significantly improve the efficiency of field construction, to reduce construction period and cost in turn, it has important significance for promoting steel pipe static pressure pile in the good development of engineering construction field.

[0009] The utility model disc purposes to provide a kind of steel pipe static pressure pile splicing node, its bearing capacity and stability are better, durability is stronger, more widely applicable, not only can ensure the safety and reliability of splicing node, simultaneously can significantly improve the efficiency of field construction, to reduce construction period and cost in turn, it has important significance for promoting steel pipe static pressure pile in the good development of engineering construction field.

[0010] A kind of steel pipe static pressure pile splicing node, including the vertical pressure into several steel pipe pile inner tubes in soil body, each steel pipe pile inner tube is sequentially longitudinally spliced;Any two adjacent steel pipe pile inner tube's splicing node place is equipped with steel retaining tube for controlling the perpendicularity of node, the steel retaining tube includes two open opposite semicircular half pipe inner tubes, the upper part of the semicircular half pipe inner tube is fixedly connected in the inner wall of the upper side steel pipe pile inner tube corresponding thereto, and the lower end of semicircular half pipe inner tube is inserted into the lumen of lower side steel pipe pile inner tube in position.

[0011] Compared with prior art, the utility model has the advantages that:

[0012] 1, by setting steel retaining tube, the perpendicularity of splicing node is ensured, the node inclination problem caused by poor welding alignment in traditional splicing mode is improved, while avoiding the need for the hole in the pile body in the prior art to damage the strength of the pile body, significantly improve the bearing capacity and overall stability of the pile body, in addition, through the cooperation of semicircular half pipe, tube side fillet weld and arc fillet weld, the safe and reliable connection of splicing node is realized;

[0013] 2, by the beveling of steel retaining tube lower end, semicircular half pipe is more easily inserted into the lumen of steel pipe pile in position, so as to improve the convenience and accuracy of node splicing. ACCURACY

[0014] Figure 1 It is the transverse sectional view of the steel pipe static pressure pile splicing node embodiment of the utility model;

[0015] Figure 2 It is the A-A cross-sectional view of Figure 1 ;

[0016] Figure 3 It is the B-B cross-sectional view of Figure 1 ;

[0017] Figure 4 It is the local structure diagram of the utility model.

[0018] Explanation of reference signs: 1 steel pipe pile, 100 welded slope, 2 semicircular half pipe, 200 chamfered part, 3 pipe side fillet weld, 4 arc fillet weld, 5 bevel weld. DETAILED DESCRIPTION

[0019] The utility model will be explained in detail below in combination with the drawings and examples:

[0020] As shown in the figure, an embodiment of the steel pipe static pressure pile splicing node provided by the utility model is shown: Figures 1-4

[0021] A steel pipe static pressure pile splicing node, comprising a plurality of steel pipe piles 1 vertically pressed into the soil body, each steel pipe pile 1 is longitudinally spliced in turn; the splicing node of any two adjacent steel pipe piles 1 is provided with a steel retaining pipe for controlling the perpendicularity of the node, the steel retaining pipe comprises two open opposite semicircular half pipes 2, the upper part of the semicircular half pipe 2 is fixedly connected to the inner wall of the corresponding upper steel pipe pile 1, and the lower end of the semicircular half pipe 2 is inserted into the lumen of the lower steel pipe pile 1 in position.

[0022] Further, the outer diameter of the steel retaining pipe is not greater than the inner diameter of the steel pipe pile 1;

[0023] Further, the semicircular half pipe 2 selects a steel pipe with corresponding thickness and corresponding length according to stress calculation to enhance the bearing capacity and deformation resistance of the node, and the length of the semicircular half pipe 2 inserted into the steel pipe pile 1 in position should not be greater than the operation length of the welding rod and welding gun;

[0024] Further, the semicircular half pipe 2 is made by longitudinally dividing a steel pipe with a diameter smaller than the steel pipe pile 1.

[0025] As shown in the figure, the top ends of the two semicircular half pipes 2 in the same steel retaining pipe are flush, and the upper sides of the two semicircular half pipes 2 are respectively welded with the arc fillet weld 4 between the inner walls of the upper steel pipe piles 1; Figure 1

[0026] And, as shown in the figure, the left and right side edges of one of the semicircular half pipes 2 of each steel retaining pipe are welded with the pipe side fillet weld 3 between the inner walls of the corresponding upper steel pipe pile 1. Figure 2 It should be noted that, due to the lack of welding work surface, only the left and right side edges of one of the semicircular half pipes 2 in each steel retaining pipe can be welded with the inner walls of the corresponding upper steel pipe pile 1.

[0027] Further, the pipe side fillet weld 3 and the arc fillet weld 4 determine the welding rod type, welding leg size, welding seam quality grade according to stress calculation and structure requirements, to ensure that the semicircular half pipe 2 is firmly connected with the steel pipe pile 1.

[0028] Further, the pipe side fillet weld 3 and the arc fillet weld 4 determine the welding rod type, welding leg size, welding seam quality grade according to stress calculation and structure requirements, to ensure that the semicircular half pipe 2 is firmly connected with the steel pipe pile 1. Further, the pipe side fillet weld 3 and the arc fillet weld 4 determine the welding rod type, welding leg size, welding seam quality grade according to stress calculation and structure requirements, to ensure that the semicircular half pipe 2 is firmly connected with the steel pipe pile 1.

[0029] The lower end outer edge of the rest of the steel pipe piles 1 is provided with an inwardly inclined welding slope 100, and a groove weld 5 matched with the welding slope 100 is welded and fixed at the joint of any two adjacent steel pipe piles 1.

[0030] Further, the groove weld 5 adopts single V-shaped groove welding.

[0031] The lower end of the steel retaining tube is provided with a bevel cut part 200 for facilitating the alignment insertion into the lumen of the steel pipe pile 1.

[0032] The construction process of the utility model is roughly as follows:

[0033] Step S1: the lowermost steel pipe pile 1 at the designed position is vertically statically pressed into the soil by using a steel pipe static pressure pile frame.

[0034] Step S2: the lower end of the steel retaining tube is bevel cut at a certain angle to form a bevel cut part 200, and the steel retaining tube is longitudinally cut along the central axis of the bevel cut part 200 to obtain two semicircular half tubes 2.

[0035] Step S3: one semicircular half tube 2 is inserted into the inside of the steel pipe pile 1 to be pressed into the soil body, and an arc-shaped fillet weld 4 is welded between the upper side of the semicircular half tube 2 and the inner wall of the steel pipe pile 1, and a tube side fillet weld 3 is welded between the left and right sides of the semicircular half tube 2 and the inner wall of the steel pipe pile 2.

[0036] Step S4: the other semicircular half tube 2 is inserted into the lumen of the same steel pipe pile, and an arc-shaped fillet weld 4 is welded between the upper side of the semicircular half tube 2 and the inner wall of the steel pipe pile 1.

[0037] Step S5: the steel pipe pile welded with the semicircular half tube 2 is hoisted by using the steel pipe static pressure pile frame, then the lower end of the semicircular half tube 2 is aligned with the lumen of the steel pipe pile 1 punched into the soil body, and then is inserted in alignment.

[0038] Step S6: after the insertion is in place, the groove weld 5 is welded at the welding slope 100 of the upper steel pipe pile 1, and the groove weld 5 welds and fixes the upper and lower steel pipe piles 1, thereby completing the splicing operation of a single steel pipe static pressure pile node.

[0039] The above is only a preferred specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A steel pipe jacking pile splicing joint, characterized in that: The utility model relates to a vertical pressure into the soil of a plurality of steel pipe piles (1), each steel pipe pile (1) is longitudinally spliced in turn, the splicing node of arbitrary two adjacent steel pipe piles (1) is equipped with steel holding pipe for controlling the perpendicularity of node, the steel holding pipe includes two open opposite semicircular half pipes (2), the upper portion of semicircular half pipe (2) is fixedly connected in the inner wall of the upper side steel pipe pile (1) corresponding to it, and the lower end of semicircular half pipe (2) is inserted into the lumen of the lower side steel pipe pile (1) in position.

2. The steel pipe jacked pile splicing joint according to claim 1, characterized in that: The top end of two semicircular half pipes (2) in the same steel holding pipe is flush, and the upper side of two semicircular half pipes (2) is welded with arc fillet weld (4) between the inner wall of the upper side steel pipe pile (1) respectively. And the left and right side edges of one semicircular half pipe (2) of each steel holding pipe are welded with pipe side fillet weld (3) between the inner wall of the upper side steel pipe pile (1) corresponding to it.

3. The steel pipe jacked pile splicing joint according to claim 1, characterized in that: The lower end of the rest steel pipe pile (1) is equipped with the welding slope (100) that inclines to the inside except the lowermost end steel pipe pile (1), and the splicing of arbitrary two adjacent steel pipe piles (1) is welded and fixed with the bevel weld (5) matched with the welding slope (100).

4. The steel pipe jacked pile splicing joint according to any one of claims 1 to 3, characterized in that: The lower end of the steel holding pipe is equipped with the beveling part (200) for facilitating the insertion into the lumen of the steel pipe pile (1) in position.

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