A combined column pile of a snap-on connecting steel lattice column and a precast pile

Abstract

The utility model belongs to a combined column pile of elastic card type connecting steel lattice column and precast pile in the field of underground construction engineering. The bottom of the steel lattice column is provided with an end plate, a plurality of high-strength connecting rods provided with threaded teeth at the upper portion are pushed into the threaded holes of the end plate from bottom to top and then are pre-fixed by nuts; the top of the reinforced concrete precast pile is provided with a plurality of concave cylinders, and a large sleeve is fixed on the cylinder wall of the concave cylinder; the main reinforcement of the reinforced concrete precast pile passes through the concave cylinder upwards and is fixed at the bottom of the concave cylinder; a plurality of limiting flaps are arranged at the top of the concave cylinder and are fixed with the large sleeve, forming an elastic card in the concave cylinder; the number, position and shape of the high-strength connecting rods correspond to the elastic card, the high-strength connecting rods are inserted into the elastic card and are fixed in the concave cylinder. The technical problem of fast and effective connection of the steel lattice column and the precast pile is solved, and the traditional bored pile in the column pile is replaced by the precast pile which is more controllable in quality and more economical and environmental.

Description

Technical Field

[0001] This utility model relates to the field of building engineering, and in particular to the column pile in underground engineering, which is composed of a steel lattice column and a precast pile connected by a spring clip structure. Background Technology

[0002] Currently, in many foundation pit projects in my country that utilize internal bracing, the vertical support structure is mostly composed of a combination of columns and pile foundations. The portion above the pit bottom consists of columns, typically steel lattice columns, while the portion below the pit bottom consists of pile foundations, usually bored cast-in-place piles. To ensure the steel lattice columns and the reinforcing cages of the bored cast-in-place piles are properly welded together during hoisting, this utility model primarily addresses the vertical support system required in foundation pit projects employing internal bracing.

[0003] For conventional bored pile foundations, this technology has the following drawbacks: 1) Bored pile construction involves underground drilling, making it difficult to control construction quality; 2) Bored pile construction generates a large amount of waste mud, which is detrimental to energy conservation and environmental protection; 3) Significant errors can easily occur during the hoisting and welding of the angle steel lattice column and the reinforcing cage of the bored pile, resulting in long welding times and a high risk of borehole wall collapse; 4) Bored piles are not economically viable. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a spring-loaded connection structure for a steel lattice column and a precast pile assembly. This solves the technical challenge of quickly and effectively connecting the steel lattice column and the precast pile, replacing traditional bored piles with precast piles that offer more controllable quality, are more economical, and are more environmentally friendly.

[0005] The technical solution of this utility model is as follows: a combined column pile with a spring-loaded connection between a steel lattice column and a precast pile, wherein the precast reinforced concrete pile is located below the bottom elevation of the foundation pit; the steel lattice column is located above the bottom elevation of the foundation pit. An end plate is installed at the bottom of the steel lattice column, and several high-strength connecting rods extend downwards from the end plate and are fixed thereon; several concave cylinders are installed at the top of the precast reinforced concrete pile, and a large sleeve is fixed to the wall of the concave cylinder; the main reinforcement of the precast reinforced concrete pile passes upwards through the concave cylinder and is fixed to the bottom of the concave cylinder; several limiting baffles are installed at the top of the concave cylinder and fixed to the large sleeve, forming a spring-loaded connection that is larger at the top and smaller at the bottom inside the concave cylinder. The number, position, and shape of the high-strength connecting rods correspond to the spring-loaded connection. The high-strength connecting rods are inserted into the spring-loaded connection and fixed inside the concave cylinder, thereby connecting the steel lattice column and the precast reinforced concrete pile to form a column pile.

[0006] Based on the above technical features: several bolt threaded holes are opened on the end plate; the connection between the high-strength connecting rod and the end plate is provided with threaded wires and nuts, and the high-strength connecting rod is pushed into the bolt threaded holes from bottom to top and then fixed with nuts, with the nuts located on the upper part of the end plate.

[0007] Based on the above technical features: a locking ring is provided at the end of the high-strength connecting rod, the locking ring is sleeved around the high-strength connecting rod, and the diameter of the locking ring is larger than the diameter of the hole formed at the lower end of the spring clip; a limiting ring is provided at the connection between the high-strength connecting rod and the bottom of the end plate, the limiting ring is sleeved around the high-strength connecting rod, and the diameter of the limiting ring is larger than the diameter of the hole formed at the upper end of the spring clip.

[0008] Based on the above technical features: the concave cylinder is filled with epoxy resin.

[0009] Based on the above technical characteristics: the main reinforcement is a prestressed steel bar.

[0010] The beneficial effects of this utility model include: 1. Steel lattice columns and precast piles can be quickly and effectively connected through a spring clip structure, avoiding the risks that may arise from manual welding during hoisting. 2. Replacing traditional cast-in-place piles with precast piles reduces waste mud, making it more green, economical, and environmentally friendly. 3. Compared to bored cast-in-place piles, the quality of precast piles is more controllable. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a combined column pile.

[0012] Figure 2 for Figure 1 AA cross-section view.

[0013] Figure 3 for Figure 1 BB cross-section.

[0014] Figure 4 This is a schematic cross-sectional view of the connection between the steel lattice column and the end plate.

[0015] Figure 5 This is a diagram showing the alignment of the ejector clips.

[0016] Figure 6 This diagram illustrates the alignment and locking of the spring clip.

[0017] The labels are as follows: 1. Precast reinforced concrete pile; 2. Steel lattice column; 3. End plate; 4. High-strength connecting rod; 5. Large sleeve; 6. Limiting plate; 7. Limiting ring; 8. Locking ring; 9. Main reinforcement; 10. Epoxy resin; 11. Angle steel; 12. Draping plate; 13. Stirrup; 14. Corbel plate; 15. Bolt threaded hole; 16. Threaded wire; 17. Washer; 18. Nut. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0019] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] like Figure 1 As shown, the column piles include precast reinforced concrete piles 1 and steel lattice columns 2. The precast reinforced concrete piles 1 are located below the bottom elevation of the foundation pit; the steel lattice columns 2 are located above the bottom elevation of the foundation pit, and an end plate 3 connects the precast reinforced concrete piles 1 and the steel lattice columns 2. Figure 2 As shown, the steel lattice column 2 includes angle steel 11 and connecting plates 12. (As...) Figure 3 As shown, the precast reinforced concrete pile 1 is a precast square pile, including stirrups 13 and main reinforcement 9.

[0021] like Figure 4 As shown, the steel lattice column 2 is connected to the end plate 3. Several bolt threaded holes 15 are opened on the end plate 3. The bolt threaded holes 15 are matched with the positions of the high-strength connecting rod 4. A threaded wire 16 and a nut 18 are provided at the connection between the high-strength connecting rod 4 and the end plate 3. The diameter of the bolt threaded hole 15 is larger than the outer diameter of the threaded wire on the upper part of the high-strength connecting rod 4. Its function is to allow for further fine-tuning using the nut 18 based on the verticality of the steel lattice column 2 during hoisting and the machining accuracy error of the end plate 3, ensuring the completion rate of the spring-loaded connection joint. Additionally, a corbel plate 14 can be reinforced at the connection between the gusset plate 12 and the end plate 3.

[0022] like Figure 5 and Figure 6 As shown, several high-strength connecting rods 4 pass downward through bolt threaded holes 15 on the end plate 3. Nuts 18 are located on the upper part of the end plate 3 and are used for position adjustment and fixation. A washer 17 can be provided on the contact surface between the nut 18 and the end plate 3.

[0023] Several concave cylinders are installed at the top of the precast reinforced concrete pile 1, and large sleeves 5 are fixed to the walls of the concave cylinders. The large sleeves 5 are generally made of alloy structural steel and are fixed to the precast reinforced concrete pile 1 by embedding and casting. The main reinforcement 9 of the precast reinforced concrete pile 1 passes upward through the concave cylinders. The main reinforcement 9 and the large sleeves 5 are fixed to the precast reinforced concrete pile 1 by integral casting. The ends of the main reinforcement 9 can be provided with enlarged ends and fixed to the bottom of the concave cylinders by the large sleeves 5 through a limiting structure. Several limiting baffles 6 are set at the top of the concave cylinders and fixed to the large sleeves 5, forming spring clips that are larger at the top and smaller at the bottom inside the concave cylinders. The number, position and shape of the high-strength connecting rods 4 correspond to the spring clips. The high-strength connecting rods 4 are inserted into the spring clips and fixed inside the concave cylinders.

[0024] As an optimization, a locking ring 8 is provided at the end of the high-strength connecting rod 4. The locking ring 8 is an enlarged structure around the high-strength connecting rod 4, and its diameter is larger than the diameter of the opening formed at the lower end of the limiting baffle 6. Its function is that after the high-strength connecting rod is inserted into the limiting baffle 6 inside the large sleeve 5, it can be tensile-limited by the locking ring. A limiting ring 7 is provided at the connection between the high-strength connecting rod 4 and the bottom of the end plate 3. The limiting ring 7 is fitted around the high-strength connecting rod 4, and its diameter is larger than the diameter of the opening formed at the upper end of the spring clip. Its function is to further enhance the mutual constraint between the end plate 3 and the high-strength connecting rod 4 and limit relative displacement.

[0025] The concave cylinder is filled with epoxy resin 10, which serves to fill any gaps that may occur between the high-strength connecting rod 4 and the large sleeve 5, thereby reducing the impact of external media such as air and water on the durability of the structure.

[0026] The main reinforcement bar 9 can be a prestressed steel bar.

[0027] In specific projects, the construction method of this utility model is as follows:

[0028] Step 1: Steel lattice columns and reinforced concrete precast piles are prefabricated in the factory. Prestressed steel bars and large sleeves 5 are reserved at the top of the reinforced concrete precast piles, and limiting baffles 6 are fixed to the top of the large sleeves 5. Steel lattice columns can be prefabricated in the factory or fabricated on site.

[0029] Step 2: Several bolt threaded holes 15 are drilled on the end plate 3, and the steel lattice column 2 is welded to the end plate 3. The position of the bolt threaded holes 15 matches the position of the high-strength connecting rod 4, and at the same time, the position of the high-strength connecting rod 4 matches the position of the concave cylinder of the precast concrete pile.

[0030] Step 3: Use the positional correspondence between the spring clip and the high-strength connecting rod for guidance and alignment. Hoist the steel lattice column to a position 200mm to 300mm above the top elevation of the precast pile. Push the high-strength connecting rod 4 with threaded teeth on the upper part into the bolt thread hole 15 of the end plate 3 from bottom to top and then pre-fix it with a nut.

[0031] Step 4: Press the high-strength connecting rod 4 into the large sleeve 5 at the top of the precast reinforced concrete pile 1. Further fine-tune the process using nuts based on factors such as the verticality of the lattice hoisting and the accuracy of the end plate processing. After adjustment, finally tighten the nuts to connect the steel lattice column and the precast reinforced concrete pile to form the column pile.

[0032] Step 5: Press the connected column piles into the ground to serve as supporting components for internal support during the foundation pit excavation process.

[0033] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A composite column pile with a spring-loaded connection between a steel lattice column and a precast pile, characterized in that: The precast reinforced concrete pile (1) is located below the bottom elevation of the foundation pit; above the bottom elevation of the foundation pit is a steel lattice column (2); the bottom of the steel lattice column (2) is provided with an end plate (3), and several high-strength connecting rods (4) pass downward from the end plate (3) and are fixed to the end plate (3); the top of the precast reinforced concrete pile (1) is provided with several concave cylinders, and a large sleeve (5) is fixed on the cylinder wall of the concave cylinder; the main reinforcement (9) of the precast reinforced concrete pile (1) passes upward through the concave cylinder and is fixed at the bottom of the concave cylinder; several limiting baffles (6) are provided at the top of the concave cylinder and are fixed to the large sleeve (5), forming a spring clip with a larger upper part and a smaller lower part inside the concave cylinder; the number, position and shape of the high-strength connecting rods (4) correspond to the spring clips; the high-strength connecting rods (4) are inserted into the spring clips and fixed inside the concave cylinder, thereby connecting the steel lattice column (2) and the precast reinforced concrete pile (1) to form a column pile.

2. The composite column pile of steel lattice column and precast pile with spring clip connection according to claim 1, characterized in that: The end plate (3) has several bolt thread holes (15); the high-strength connecting rod (4) is connected to the end plate (3) with a thread and a nut (18). The high-strength connecting rod (4) is pushed into the bolt thread hole (15) from bottom to top and then fixed with the nut (18). The nut (18) is located on the upper part of the end plate (3).

3. A combined column pile of steel lattice column and precast pile with spring clip connection according to claim 1 or 2, characterized in that: A locking ring (8) is provided at the end of the high-strength connecting rod (4). The locking ring (8) is sleeved around the high-strength connecting rod (4). The diameter of the locking ring (8) is larger than the diameter of the hole formed at the lower end of the spring clip. A limiting ring (7) is provided at the connection between the high-strength connecting rod (4) and the bottom of the end plate (3). The limiting ring (7) is sleeved around the high-strength connecting rod (4). The diameter of the limiting ring (7) is larger than the diameter of the hole formed at the upper end of the spring clip.

4. The combined column pile of steel lattice column and precast pile with spring clip connection according to claim 1, characterized in that: The concave cylinder is filled with epoxy resin (10).

5. A combined column pile of steel lattice column and precast pile with spring clip connection according to claim 1, characterized in that: The main reinforcement (9) is a prestressed steel bar.

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