Prefabricated assembled pier grouting joint structure

Abstract

The utility model discloses a prefabricated assembled bridge pier grouting joint structure which comprises a bearing platform and a prefabricated pier column section, reserved through holes which are longitudinally communicated are formed in the bearing platform and the prefabricated pier column section, reinforcement cages are arranged in the reserved through holes, a prefabricated groove hole matched with the prefabricated pier column section is formed in the top end of the bearing platform, and the prefabricated groove hole is communicated with the prefabricated pier column section. Positioning connection structures which are embedded with each other are prefabricated at the joints of every two adjacent prefabricated pier column sections; the positioning conical grooves in the two ends of the prefabricated pier column section and the conical surface of the pressing connecting conical head are designed in a self-locking mode, the pressing connecting conical head is arranged to be a rectangular pyramid, instant guiding and positioning of hoisting of the prefabricated pier column section are achieved, the time consumed for adjusting the reserved through hole is shortened, the pressing connecting conical head is pressed to generate radial separation, and the positioning accuracy of the prefabricated pier column section is improved. The shear bearing capacity of the joint is improved; the connecting spiral convex ribs are arranged on the inner wall of the reserved through hole to form a continuous thread-shaped interface, so that the mechanical meshing force between the grouting material and the hole wall is improved, and the interface is prevented from sliding.

Description

Technical Field

[0001] This utility model relates to the field of bridge pier technology, specifically to a grouting joint structure for prefabricated assembled bridge piers. Background Technology

[0002] In prefabricated bridge construction, the connection performance between pier segments directly determines the structural integrity and seismic resistance. For example, Chinese patent application number CN201820783328.9 discloses a grouting joint structure for prefabricated assembled bridge piers, belonging to the field of bridge engineering technology. It includes a pier cap, prefabricated pier segments, and a high-strength mortar cushion layer. The pier cap and prefabricated pier segments, as well as the prefabricated pier segments themselves, are connected by the high-strength mortar cushion layer. The pier cap and prefabricated pier segments have longitudinally connected pre-reserved through-hole groups inside. Segmental reinforcing bars are provided on both sides of the pre-reserved through-hole groups. Circular stirrups (A) are embedded at the outer edge of the pre-reserved through-hole groups. Longitudinal reinforcing bars and circular stirrups (B) for fixing the longitudinal reinforcing bars are provided inside the pre-reserved through-holes. A grout inlet pipe is connected to the pre-reserved through-holes in the pier cap. The beneficial effects of this utility model are: the cylindrical pre-reserved through-hole grouting connection of each precast segment eliminates the need for on-site formwork and supports, accelerating the construction progress; the multi-column grouting hole connection allows for a larger number of reinforcing bars to pass through the joint surface, resulting in partial concrete continuity, better overall integrity of the precast pier, and more reliable stress distribution. Although multiple precast pier segments can be assembled and connected, the ends of the precast pier segments directly contact the foundation, and adjacent precast pier segments are also directly butted together at the ends. After inserting the reinforcing cage and grouting, the interlocking force between the grout and the hole wall is not high, resulting in low stability and the possibility of slippage. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a prefabricated grouting joint structure for bridge piers.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] This utility model discloses a grouting joint structure for prefabricated assembled bridge piers, comprising a pier cap and prefabricated pier segments. The pier cap and prefabricated pier segments have longitudinally connected reserved through holes, and reinforcing cages are installed inside the reserved through holes. The top of the pier cap has a prefabricated slot that mates with the prefabricated pier segments. Interlocking positioning connection structures are prefabricated at the connection points of adjacent prefabricated pier segments. The positioning connection structure includes positioning conical grooves at both ends of the prefabricated pier segments, and a clamping connection cone is provided between two opposing positioning conical grooves. The clamping connection cone is a square pyramid. Connecting spiral ribs are prefabricated on the inner walls of the reserved through holes and prefabricated slots.

[0006] As a preferred technical solution of this utility model, the cross section of the connecting spiral rib is set to any one of trapezoidal, semi-circular or rectangular.

[0007] As a preferred technical solution of this utility model, the connecting spiral rib is made of a perforated corrugated pipe prefabricated on the inner wall of the reserved through hole and the prefabricated slot, and the perforated corrugated pipe is a galvanized steel corrugated pipe.

[0008] As a preferred technical solution of this utility model, the cone surface inclination angle of the positioning conical groove is set to 45°-60°.

[0009] As a preferred technical solution of this utility model, a longitudinally penetrating grouting channel is provided at the center of both the pressing connection cone and the precast pier segment.

[0010] As a preferred technical solution of this utility model, the depth of the precast slot is set to 1.2 times the diameter of the precast pier segment, and a drainage guide groove is provided at the bottom of the precast slot.

[0011] The beneficial effects of this utility model are:

[0012] This type of precast pier grouting joint structure achieves instantaneous guiding and positioning of the precast pier segment during hoisting by using a self-locking design of the positioning conical grooves and the conical surfaces of the clamping connection cones at both ends of the precast pier segment. The clamping connection cones are designed as square pyramids, which reduces the time spent adjusting the corresponding reserved through holes. The clamping connection cones are radially separated under pressure, which improves the shear bearing capacity of the joint. By providing connecting spiral ribs on the inner wall of the reserved through holes, a continuous threaded interface is formed, which increases the mechanical interlocking force between the grout and the hole wall and prevents the interface from slipping. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a structural cross-sectional view of a prefabricated assembled bridge pier grouting joint structure according to this utility model;

[0015] Figure 2 This is a partially enlarged sectional view of a precast pier segment of a precast pier column, which is part of the grouting joint structure of a precast assembled bridge pier according to this utility model.

[0016] In the figure: 1. Foundation; 101. Precast slot; 102. Drainage guide channel; 2. Precast pier segment; 3. Reserved through hole; 301. Connecting spiral rib; 4. Reinforcing cage; 5. Positioning connection structure; 501. Positioning conical groove; 502. Pressing connection cone; 503. Grouting channel. Detailed Implementation

[0017] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] Example: Figure 1 and Figure 2 As shown, this utility model discloses a precast assembled bridge pier grouting joint structure, including a pier cap 1 and a precast pier segment 2. The pier cap 1 and the precast pier segment 2 have longitudinally connected reserved through holes 3, and a reinforcing cage 4 is installed inside the reserved through holes 3. The top of the pier cap 1 has a precast slot 101 that mates with the precast pier segment 2. At the connection points of two adjacent precast pier segments 2, mutually interlocking positioning connection structures 5 are precast. The positioning connection structure 5 includes positioning conical grooves 501 at both ends of the precast pier segment 2, and a pressing connection cone 502 is provided between two opposing positioning conical grooves 501. The pressing connection cone 502 is configured as... The inner walls of the reserved through hole 3 and the prefabricated slot 101 are prefabricated with connecting spiral ribs 301. Through the self-locking design of the positioning conical groove 501 at both ends of the prefabricated pier segment 2 and the conical surface of the pressing connecting cone 502, and the pressing connecting cone 502 is set as a square pyramid, the instantaneous guiding and positioning of the prefabricated pier segment 2 during hoisting is realized, reducing the time spent adjusting the reserved through hole 3. The pressing connecting cone 502 is radially separated under pressure, which improves the shear bearing capacity of the node. By providing connecting spiral ribs 301 on the inner wall of the reserved through hole 3, a continuous threaded interface is formed, which improves the mechanical interlocking force between the grout and the hole wall and avoids interface slippage.

[0019] The cross-section of the connecting spiral rib 301 is set to any one of trapezoidal, semi-circular or rectangular.

[0020] The connecting spiral rib 301 is made of a perforated corrugated pipe prefabricated on the inner wall of the reserved through hole 3 and the prefabricated slot hole 101. The perforated corrugated pipe is a galvanized steel corrugated pipe, which has both anti-corrosion function and standardized production advantages, thus improving service life.

[0021] The cone angle of the positioning conical groove 501 is set to 45°-60°.

[0022] The compression connecting cone 502 and the center of the precast pier segment 2 are both provided with longitudinally penetrating grouting channels 503 to achieve multi-directional grouting and ensure sufficient grouting fluid.

[0023] The depth of the precast slot 101 is set to 1.2 times the diameter of the precast pier segment 2, and the bottom of the precast slot 101 is provided with a drainage guide 102, which can actively drain rainwater and seepage water, eliminating the source of frost heave damage, and is especially suitable for high humidity and cold environment.

[0024] During operation, this type of precast pier grouting joint structure achieves instantaneous guiding and positioning during the hoisting of the precast pier segment 2 through the self-locking design of the positioning conical grooves 501 and the pressing connection cones 502 at both ends of the precast pier segment 2, and the pressing connection cones 502 are designed as square pyramids. This reduces the time spent adjusting the corresponding reserved through holes 3. The pressing connection cones 502 are radially separated under pressure, which improves the shear bearing capacity of the joint. By providing connecting spiral ribs 301 on the inner wall of the reserved through holes 3, a continuous threaded interface is formed, which improves the mechanical interlocking force between the grout and the hole wall and avoids interface slippage.

[0025] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model 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 this utility model should be included within the protection scope of this utility model.

Claims

1. A precast assembled bridge pier grouting joint structure, comprising a pier cap (1) and a precast pier segment (2), wherein the pier cap (1) and the precast pier segment (2) are provided with longitudinally connected reserved through holes (3), and a reinforcing cage (4) is provided inside the reserved through holes (3), characterized in that, The top of the pier (1) is provided with a precast slot (101) that matches the precast pier segment (2), and the connection between two adjacent precast pier segments (2) is provided with a positioning connection structure (5) that fits into each other. The positioning connection structure (5) includes positioning conical grooves (501) at both ends of the precast pier segment (2), and a pressing connection cone (502) is provided between the two opposite positioning conical grooves (501), and the pressing connection cone (502) is a square pyramid. The inner walls of the reserved through hole (3) and the prefabricated slot (101) are prefabricated with connecting spiral ribs (301).

2. The prefabricated assembled bridge pier grouting joint structure according to claim 1, characterized in that, The cross section of the connecting spiral rib (301) is set to any one of trapezoidal, semi-circular or rectangular.

3. The prefabricated assembled bridge pier grouting joint structure according to claim 1, characterized in that, The connecting spiral rib (301) is a perforated corrugated pipe prefabricated on the inner wall of the reserved through hole (3) and the prefabricated slot (101), and the perforated corrugated pipe is a galvanized steel corrugated pipe.

4. The prefabricated assembled bridge pier grouting joint structure according to claim 1, characterized in that, The cone inclination angle of the positioning conical groove (501) is set to 45°-60°.

5. The precast assembled bridge pier grouting joint structure according to claim 1, characterized in that, Both the compression connecting cone (502) and the center of the precast pier segment (2) are provided with longitudinally penetrating grouting channels (503).

6. The precast assembled bridge pier grouting joint structure according to claim 1, characterized in that, The depth of the precast slot (101) is set to 1.2 times the diameter of the precast pier segment (2), and a drainage guide channel (102) is provided at the bottom of the precast slot (101).

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