CN-117626951-B - Pile splicing structure of mechanical self-locking type concrete precast pile and construction method

Abstract

The invention discloses a mechanical self-locking type pile splicing structure of a concrete precast pile and a construction method, wherein the pile splicing structure comprises an upper end plate, a lower end plate and a connecting structure consisting of an upper sleeve, a lower sleeve, two groups of wedge pieces, two groups of positioning rings and two connecting steel bars; the connecting structure is provided with a plurality of groups and is respectively arranged between longitudinal steel bars in the upper section precast pile and the lower section precast pile and used for connecting the upper section precast pile and the lower section precast pile. The invention uses the sleeve, the connecting steel bar, the locating ring and the wedge to mechanically connect the longitudinal steel bars in the adjacent precast concrete piles one by one, the force transmission of the longitudinal steel bars in the precast piles is direct and reliable, after pile splicing, the longitudinal steel bars in the upper pile body and the lower pile body realize the mechanical self-locking connection, the connected longitudinal steel bars can not be pulled apart, the safe and reliable pile splicing of the precast concrete piles is realized, the construction is convenient and fast, and the cost is low.

Inventors

• FAN LI

Assignees

• 中国矿业大学

Dates

Publication Date

20260508

Application Date

20231218

Claims (7)

1. 1. A mechanical self-locking type concrete precast pile splicing structure, which is characterized by comprising: The upper end plate and the lower end plate are respectively and fixedly arranged at the bottom of the upper section precast pile and the top of the lower section precast pile in the precast pile manufacturing stage, and are the same as the section size of the pile body, and sleeve positioning holes are formed in the end plate at positions corresponding to each longitudinal steel bar in the pile body; multiunit connection structure, arrange respectively in between the vertical reinforcing bar in the upper segment precast pile the hypomere precast pile for connect upper segment precast pile and hypomere precast pile, every group includes: The upper sleeve and the lower sleeve are respectively and fixedly formed in the upper section precast pile and the lower section precast pile in the precast pile manufacturing stage and are of an up-down symmetrical structure, the top of the upper sleeve is mechanically connected with the bottom section of the longitudinal steel bar in the upper section precast pile, the bottom of the upper sleeve is a cylinder port end and is fixedly accommodated in a sleeve positioning hole of the upper end plate, the bottom of the lower sleeve is mechanically connected with the top section of the longitudinal steel bar in the lower section precast pile, and the top of the lower sleeve is a cylinder port end and is fixedly accommodated in a sleeve positioning hole of the lower end plate; Conical frustum-shaped chambers with gradually reduced inner diameters towards the end direction of the cylinder mouth are formed in the cylinders of the two groups of sleeves; the two groups of wedge pieces are vertically arranged on vertical central lines in the chambers of the upper sleeve and the lower sleeve respectively, and one thin end of each wedge piece is a wedge piece head and is arranged towards the cylinder mouth end; The two groups of positioning rings are respectively arranged at the outer sides of the heads of the two wedge pieces, can be accommodated in the sleeve positioning holes and are connected with the barrel mouth end of the sleeve, and the positioning rings are divided into two groups of symmetrical positioning ring holes through the wedge pieces so as to enable the two connecting steel bars to pass through in a sliding manner; The two connecting steel bars are symmetrically arranged in parallel, the sections are arc-shaped, the opposite sides are arc-shaped surfaces, the end parts of the two connecting steel bars can synchronously pass through the positioning rings and then are inserted into the sleeve, and the two connecting steel bars are symmetrically distributed on the two sides of the wedge piece and are bent and deformed under the limit guide of the wedge piece and the positioning rings; the length of the connecting steel rod is smaller than the distance between the bottom ends of the conical frustum-shaped cavity of the upper sleeve and the conical frustum-shaped cavity of the lower sleeve; the tensile strength of the connecting steel bar is not lower than that of the longitudinal steel bars; The opposite sides of the two connecting steel bars are planes, and a positioning structure is arranged, wherein the positioning structure comprises a protrusion and a groove which are respectively arranged at the centers of the opposite sides of the two connecting steel bars, and the protrusion and the groove can be matched to perform positioning locking on the two connecting steel bars; the positioning ring is in a circular ring shape, the joint contact surface of the nozzle end of the sleeve and the positioning ring is positioned in the sleeve positioning hole of the end plate, and the outer surface of the positioning ring does not protrude out of the outer surface of the end plate; The front projection of the positioning ring hole is arched, and the arched sagittal height of the section of the connecting steel rod is smaller than the sagittal height of the positioning ring hole, so that the steel rod freely passes through the positioning ring hole.
2. 2. The pile splicing structure of the mechanical self-locking type concrete precast pile according to claim 1, wherein the upper sleeve and the lower sleeve comprise a splicing section and a sleeve section, the splicing section is of a hollow cylindrical structure and is used for being connected with longitudinal steel bars in the precast pile, and the sleeve section is of a hollow cylindrical structure and is internally provided with a conical frustum-shaped cavity and used for being installed and fixed by connecting steel bars.
3. 3. The pile splicing structure of the mechanical self-locking type concrete precast pile according to claim 2, wherein when the longitudinal steel bars in the precast pile are common steel bars, the inner wall of the splicing section can be provided with internal threads, the longitudinal steel bar connecting section is provided with external threads, and the splicing section is connected with the longitudinal steel bars through threads; When the longitudinal steel bar in the precast pile is a prestressed steel strand, the inner wall of the connecting section can be provided with inner threads, and the sleeve connecting section is connected with the prestressed steel strand through cold extrusion.
4. 4. The pile extension structure of claim 1, wherein the wedge and the positioning ring are cast integrally, so that two ends of the wedge head are fixedly connected with the inner wall of the positioning ring.
5. 5. The pile extension structure of a mechanically self-locking type concrete precast pile according to claim 1, wherein two ends of the wedge head are fixedly connected with the inner wall of the positioning ring through welding.
6. 6. The pile splicing structure of the mechanically self-locking type concrete precast pile according to claim 2, wherein the outer diameter of the sleeve section is larger than that of the splicing section, and the gradient of an included angle between a bus of a conical frustum-shaped cavity of the inner wall of the sleeve section and a central axis is 1/50-1/20.
7. 7. A construction method of a mechanically self-locking concrete precast pile extension structure based on any one of claims 1 to 6, characterized by comprising the following steps: S1, processing a member, namely firstly processing and manufacturing a precast pile with a sleeve and an end plate in a factory and connecting a steel rod, a positioning ring and a wedge; s2, pile extension preparation, namely pile sinking construction of the lower precast pile is carried out on a construction site, and pile extension preparation is carried out after the lower precast pile is driven into place; S3, installing a connecting fitting; Aligning the two connecting steel bars, respectively installing a group of locating rings and a group of wedge pieces at the end parts of the two connecting steel bars, enabling the end parts of the connecting steel bars to pass through the locating ring holes, enabling the wedge piece heads to be inserted between the two connecting steel bars, and enabling the two connecting steel bars to be located and connected through locating structures at opposite sides, so that the connecting steel bars, the locating rings and the wedge pieces form a group of connecting fittings together; S4, pre-installing and positioning the connecting structure of the lower precast pile, removing a plastic protective cap in the lower sleeve, pre-matching one end of a plurality of groups of connecting fittings with each lower sleeve of the lower precast pile, placing wedge pieces at the bottom end of each group of connecting fittings and the end parts of connecting steel bars in each lower sleeve, and overlapping a positioning ring on a barrel opening of each lower sleeve to form preliminary positioning; S5, installing an upper precast pile, removing a plastic protective cap in the upper sleeve, lifting the upper precast pile above the lower precast pile, aligning the upper precast pile up and down, matching the other ends of a plurality of groups of connecting fittings with the upper sleeves of the upper precast pile, aligning wedge pieces, positioning rings and the ends of connecting steel bars at the top ends of each group of connecting fittings with cylinder openings of the upper sleeve, gradually pressing the two ends of the connecting steel bars into cone-shaped cavities of the upper sleeve and the lower sleeve in a gravity sedimentation mode by slowly descending the upper precast pile, bending and deforming the whole connecting steel bars under the constraint of the two groups of positioning rings and the wedge pieces, and tightly extruding and locking the outer side surfaces of the connecting steel bars with the inner walls of the cone-shaped cavities to realize connection of the upper precast pile and the lower precast pile; And S6, connecting and fastening the upper precast pile and the lower precast pile, and continuing the pile sinking construction of the upper precast pile, wherein the joint of the upper precast pile and the lower precast pile is further compressed under the strong lower pressure of the pile sinking of the upper precast pile, so that the sleeve, the connecting steel rod and the wedge plate are completely locked, and the complete and reliable connection of the upper precast pile and the lower precast pile is realized.

Description

Pile splicing structure of mechanical self-locking type concrete precast pile and construction method Technical Field The invention relates to the technical field of concrete precast piles in constructional engineering, in particular to a pile splicing structure of a mechanical self-locking concrete precast pile and a construction method. Background The concrete precast pile is a foundation pile form commonly used in constructional engineering, and the common concrete precast pile comprises a hollow tubular pile and a solid square pile. The length of a single precast concrete pile cannot be too long due to the limitations of production conditions and transportation conditions. When the designed pile length of the building foundation pile exceeds the length of a single precast pile, pile splicing is required for the concrete precast pile. And connecting the single precast pile in the vertical direction in the pile sinking construction process of the precast pile to form a vertical continuous precast pile with the total length meeting the design requirement. The existing lengthening method of the concrete precast pile is mainly a steel structure welding pile-splicing method. The pile end of the concrete precast pile is provided with a section of steel structure pile head, and when the pile is spliced, the steel structure pile heads of adjacent precast piles are welded and connected into a whole at a construction site, so that the extension of the concrete precast pile is realized. The steel structure welding pile splicing method of the concrete precast pile has the main defects that: 1) When a single concrete precast pile is produced, a steel structure pile head for welding connection is required to be arranged at the end part of the precast pile, so that the cost of the concrete precast pile is increased, and the production difficulty of the concrete precast pile is increased. 2) When the precast pile is spliced, field welding operation is needed in the pile sinking construction process, the upper precast pile is in a hoisting state during the welding operation, the field construction condition is complex and difficult, the field climate environment is changeable, and the welding quality is difficult to ensure. The field welding operation increases the difficulty and cost of precast pile construction. 3) In the steel structure welding pile extension method, longitudinal steel bars in adjacent concrete precast pile bodies are indirectly connected with welding seams through steel structure pile heads, a force transfer path of the longitudinal steel bars in the pile bodies is indirect and complex, the force transfer reliability is poor, and the integrity and rigidity of the pile bodies after pile extension are poor. 4) The steel structure welding pile splicing method cannot ensure that the contact surfaces of adjacent precast piles are completely compressed, and due to the influence factors such as limited thermal deformation and weld joint size, difficult guarantee of welding quality and the like possibly caused by steel welding, the axial rigidity of a pile body is weaker, and the foundation pile quality problem is easy to generate during pile forming quality inspection. Therefore, the conventional method for welding and pile-splicing the steel structure of the concrete precast pile has a plurality of defects. In order to ensure the pile splicing quality of the concrete precast pile, realize safe and reliable pile splicing connection of the concrete precast pile, convenient construction and low cost, a new pile splicing method and technology of the concrete precast pile are required to be developed. Disclosure of Invention The invention aims to disclose a mechanical self-locking type pile extension structure of a concrete precast pile and a construction method, so as to solve the defects, realize the aims of safety, reliability, convenience in construction and low cost of the pile extension of the concrete precast pile, and simultaneously, the construction method provided by the invention can be also used for connecting concrete members such as a concrete precast column, a concrete precast shear wall and the like. In order to achieve the above object, the present invention provides a mechanical self-locking type pile splicing structure for concrete precast pile, comprising: The upper end plate and the lower end plate are respectively and fixedly arranged at the bottom of the upper section precast pile and the top of the lower section precast pile in the precast pile manufacturing stage, and are the same as the section size of the pile body, and sleeve positioning holes are formed in the end plate at positions corresponding to each longitudinal steel bar in the pile body; multiunit connection structure, arrange respectively in between the vertical reinforcing bar in the upper segment precast pile the hypomere precast pile for connect upper segment precast pile and hypomere precast pile, every group includes: T