Connecting structure of precast pile top and foundation

Abstract

The utility model belongs to the field of building structures, and provides a precast pile top and foundation connecting structure which comprises a precast pile, a pile cap and a reinforced concrete foundation. The pile top of the precast pile is higher than the designed elevation, the pile cap covers the pile top of the precast pile, the inner wall of the pile cap is fixedly attached to the outer wall of the precast pile, a plurality of rows of shear keys are distributed on the outer side wall of the pile cap in the vertical direction at intervals, and each row of shear keys are distributed in the circumferential direction of the outer side wall of the pile cap at intervals. The shear key, the pile cap and the precast pile top are all pre-buried in the reinforced concrete foundation. According to the connecting structure, a traditional pile cap is firstly reinforced, then direct connection between the pile top and the foundation is achieved in the mode that the shear key is arranged on the pile cap, the problem of connection between the pile and the foundation when the solid elevation of the precast pile top is higher than the designed elevation due to the construction problem can be solved, pile cutting treatment is not needed, and the construction cost is reduced. The prefabricated pile has the advantages of no damage, reliable stress connection, convenience in construction and the like.

Description

Technical Field

[0001] The utility model belongs to the field of building structures, and in particular relates to a connection structure between a prefabricated pile top and a foundation. Background Art

[0002] During the construction process, due to the soil layer, some of the pile tops cannot sink to the designed elevation when the precast piles are sunk, and will be slightly higher than the designed elevation. At this time, the piles need to be cut, that is, the concrete of the precast piles above the designed elevation is chiseled out, and the steel bars or prestressed tendons in the piles are stripped out and anchored into the foundation.

[0003] The pile cutting operation will cause certain damage to the precast piles. Generally, some strengthening measures need to be taken after the pile cutting. In addition, the prestressed steel bar extension process is complicated and has low reliability. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a connection structure between the top of a precast pile and a foundation, which can solve the problem of connecting the pile with the foundation when the actual elevation of the top of the precast pile is higher than the design elevation due to construction problems.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a connection structure between the top of a precast pile and a foundation, comprising a precast pile, a pile cap, and a reinforced concrete foundation;

[0006] The top of the precast pile is higher than the design elevation, the pile cap is arranged on the top of the precast pile, the inner wall of the pile cap is fitted and fixed to the outer wall of the precast pile, a plurality of rows of shear keys are vertically spaced apart on the outer wall of the pile cap, each row of the shear keys is circumferentially spaced apart along the outer wall of the pile cap, the shear keys are fixed to the pile cap, and the shear keys, the pile cap and the top of the precast pile are all pre-buried in the reinforced concrete foundation.

[0007] Preferably, the shear key is any one of a shear stud, a steel bar, and a steel section.

[0008] Preferably, the shear key is fixed to the pile cap by welding.

[0009] Preferably, an interface adapted to the shear key is reserved on the pile cap, and the shear key is installed in the interface.

[0010] Preferably, the pile cap comprises a pile cap top steel plate and a pile cap side steel plate, the pile cap top steel plate is fixed to the pile cap side steel plate, and the shear key is fixed to the pile cap side steel plate.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model provides a connection structure between the top of a precast pile and a foundation, which can firstly strengthen the traditional pile cap, and then realize the direct connection between the pile top and the foundation by arranging a shear key on the pile cap, which can solve the problem of connecting the pile with the foundation when the actual elevation of the top of the precast pile is higher than the design elevation due to construction problems, and there is no need to cut the pile top part that is higher than the design elevation, and has the advantages of no damage to the precast pile, reliable force connection, and convenient construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic front view of the structure of the connection between the top of a prefabricated pile and a foundation provided in an embodiment of the utility model;

[0014] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0015] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at BB in the middle.

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0017] 1. Pile cap top steel plate; 2. Pile cap side steel plate; 3. Shear key; 4. Precast piles; 5. Reinforced concrete foundation. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand the present invention more clearly.

[0019] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrally formed structure. For ordinary technicians in this field, the specific meanings of such terms in this patent can be understood according to specific circumstances.

[0020] Example 1

[0021] like Figure 1 As shown, a connection structure between a precast pile top and a foundation includes a precast pile 4, a pile cap, and a reinforced concrete foundation 5;

[0022] The top of the precast pile 4 is higher than the designed elevation, the pile cap is arranged on the top of the precast pile 4, the inner wall of the pile cap is fitted and fixed to the outer wall of the precast pile 4, three rows of shear keys 3 are evenly distributed vertically along the outer wall of the pile cap, each row of the shear keys 3 is evenly distributed circumferentially along the outer wall of the pile cap, the shear keys 3 are fixed to the pile cap, and the shear keys 3, the pile cap and the top of the precast pile 4 are all pre-buried in the reinforced concrete foundation 5.

[0023] In this embodiment, the difference between the pile top elevation of the precast pile 4 and the design elevation needs to be within a certain range, and the difference cannot be too large, because the pile top elevation of the precast pile 4 needs to be lower than the bottom elevation of the foundation reinforcement to avoid affecting the laying of the reinforcement at the pile top. It is worth noting that when the difference is too small, to avoid the outer wall of the pile cap not having enough length within the foundation range to install the shear key 3, a square steel pipe of the same size can be welded on the top of the pile cap, which is equivalent to lengthening the pile cap upwards. At this time, the shear key 3 can be welded on the outer wall of the square steel pipe.

[0024] The pile cap can be made according to the relevant national standard atlas or the internal standard of the manufacturer, but its thickness and size need to be adjusted according to the structural design results based on the specific engineering force requirements. That is to say, based on the traditional pile cap, its top plate can be thickened, and the thickness is calculated and determined according to the engineering design requirements; its side plate can be lengthened and thickened, and the size and thickness of the side plate are calculated and determined according to the engineering design requirements.

[0025] The conventional pile cap is mainly used to protect the pile top from erosion and damage by the external environment. It can play the role of waterproofing, anti-corrosion, and increasing the bearing capacity of the pile top. In this embodiment, the shear key 3 can play the role of transmitting force. By evenly arranging a plurality of the shear keys 3 on the outer wall of the pile cap, the shear bearing capacity between the pile cap and the reinforced concrete foundation 5 can be increased.

[0026] Based on the above structure, the connection structure between the top of the precast pile and the foundation provided in this embodiment can firstly strengthen the traditional pile cap, and then realize the direct connection between the top of the pile and the foundation by setting a shear key on the pile cap, which can solve the problem of the connection between the pile and the foundation when the actual elevation of the top of the precast pile is higher than the design elevation due to construction problems. There is no need to cut the pile top part that is higher than the design elevation, and it has the advantages of no damage to the precast pile, reliable force connection, and convenient construction.

[0027] In this embodiment, the shear key 3 can be any one of a shear stud, a steel bar, and a steel section. As required, the shear key 3 can also be other components that can increase the shear bearing capacity between the pile cap and the reinforced concrete foundation 5. The number and specifications of the shear keys 3 are determined by the structural design according to the specific engineering force requirements.

[0028] In this embodiment, the shear key 3 can be welded and fixed to the pile cap. As required, the shear key 3 and the pile cap can also be connected by other means such as mechanical connection. For example, an interface adapted to the shear key 3 can be reserved on the pile cap, and the shear key 3 is installed in the interface.

[0029] In this embodiment, Figure 2-3As shown, the pile cap includes a pile cap top steel plate 1 and four pile cap side steel plates 2. The pile cap top steel plate 1 is fitted and fixed to the top surface of the precast pile 4. The cross-section of the precast pile 4 is a rectangular structure. The four pile cap side steel plates 2 are respectively fitted and fixed to the four side walls of the precast pile 4. The top of the pile cap side steel plate 2 is fixedly connected to the pile cap top steel plate 1, and six shear keys 3 are fixed on each of the pile cap side steel plates 2.

[0030] The thickness of the pile cap top steel plate 1 is calculated and determined according to the engineering design requirements, and the size and thickness of the pile cap side steel plate 2 are calculated and determined according to the engineering design requirements.

[0031] The size of the top of the precast pile 4 may be smaller than the size of other positions of the precast pile 4. For example, Figure 3 As shown, the length and width of the top of the precast pile 4 are smaller than the length and width of the middle of the precast pile 4, so that after the pile cap is installed, the outer wall of the pile cap side steel plate 2 is flush with the outer wall of the middle of the precast pile 4, which can improve the integrity of the pile cap and the precast pile 4.

[0032] In summary, the connection structure between the precast pile top and the foundation provided in this embodiment may include the following steps in its construction method:

[0033] Step 1: Thicken the traditional pile cap top steel plate according to the engineering design requirements;

[0034] Step 2: Lengthen and thicken the traditional pile cap side steel plate according to the engineering design requirements;

[0035] Step 3: Process the shear keys according to the engineering design requirements;

[0036] Step 4: Sink the precast piles on site, find the precast piles whose pile top elevation is higher than the design elevation, and weld the shear keys on the steel plates on the pile cap sides;

[0037] Step 5: Pour the reinforced concrete foundation to complete the connection.

[0038] The mechanisms, components and parts not specifically described in the present invention are all existing structures in the prior art and can be directly purchased from the market.

[0039] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present utility model. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0040] The above is only a preferred embodiment of the utility model, and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A connection structure between a prefabricated pile top and a foundation, characterized in that: It includes a prefabricated pile (4), a pile cap, and a reinforced concrete foundation (5); The top of the precast pile (4) is higher than the design elevation, the pile cap is arranged on the top of the precast pile (4), the inner wall of the pile cap is fitted and fixed to the outer wall of the precast pile (4), a plurality of rows of shear keys (3) are vertically spaced apart on the outer wall of the pile cap, each row of the shear keys (3) is circumferentially spaced apart along the outer wall of the pile cap, the shear keys (3) are fixed to the pile cap, and the shear keys (3), the pile cap and the top of the precast pile (4) are all pre-buried inside the reinforced concrete foundation (5).

2. The connection structure between the top of a precast pile and a foundation according to claim 1, characterized in that: The shear key (3) is any one of a shear stud, a steel bar, and a steel section.

3. The connection structure between the top of a precast pile and a foundation according to claim 1, characterized in that: The shear key (3) is fixed to the pile cap by welding.

4. The connection structure between the top of a precast pile and a foundation according to claim 1, characterized in that: An interface adapted to the anti-shear key (3) is reserved on the pile cap, and the anti-shear key (3) is installed in the interface.

5. The connection structure between the top of a precast pile and a foundation according to claim 1, characterized in that: The pile cap comprises a pile cap top steel plate (1) and a pile cap side steel plate (2); the pile cap top steel plate (1) is fixed to the pile cap side steel plate (2); and the shear key (3) is fixed to the pile cap side steel plate (2).

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