Connecting structure based on prefabricated stand column and bearing platform

Abstract

The utility model relates to a connecting structure based on a prefabricated stand column and a bearing platform, which comprises the prefabricated stand column, a socket type bearing platform, a shear transmission anchoring mechanism, an anchor beam, a high-strength bolt, a shear force connecting mechanism installed on the prefabricated stand column in a pre-embedded manner and a pre-embedded corrugated pipe installed on the socket type bearing platform in a pre-embedded manner, the socket type bearing platform is provided with a groove, the prefabricated stand column and the groove are respectively provided with an anti-shear tooth key groove, the shear transmission anchoring mechanism is connected with the shear connecting mechanism, the high-strength bolt is connected with the anchor beam, and the shear transmission anchoring mechanism is connected with the socket type bearing platform through the high-strength bolt and the anchor beam. Gaps are reserved between the prefabricated stand columns and the grooves, and high-strength grouting materials are poured into the gaps to form shear-resistant tooth keys. The shear-resistant tooth key grooves are formed in the prefabricated stand column and the socket-and-spigot bearing platform, the high-strength grouting materials are poured into the gaps to form the shear-resistant tooth key, the prefabricated stand column and the socket-and-spigot bearing platform are connected together, and the overall stress performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of prefabricated assembly, in particular to a connection structure based on prefabricated columns and bearing platforms. Background Art

[0002] In existing bridge substructures, prefabricated assembly construction techniques and structures are increasingly being used. Prefabricated assembly has the advantages of fast construction speed, minimal impact on traffic, less dust on site, and low noise. The columns and pedestals of the substructure piers are often connected using a variety of methods, including grouting sleeve connections, metal bellows connections, socket connections, and prestressed connections. Compared with the commonly used grouting sleeve connection, the socket connection is more convenient to construct and has lower construction precision requirements. The pedestal adopts a socket-type structure. Prefabricated columns do not require grouting sleeves and the corresponding thick steel bar structure. Flexible steel bar configurations similar to cast-in-place columns can be used, and smaller column sizes can be used. The prefabricated columns are transported to the site, hoisted above the pedestal, and hoisted into place for trial. The bottom of the column is mortared, and the column is leveled, positioned, grouted with high-strength grouting material, and maintained.

[0003] However, conventional socket-and-spigot connections also have many disadvantages. Due to the seismic requirements of socket-and-spigot connections, the socket depth must reach a certain dimension to meet the requirements. Theoretically, it is at least 0.7D (D is the column diameter). Therefore, the socket depth of the pedestal must at least meet this requirement, resulting in a relatively thin thickness below the pedestal. The pedestal must also meet the shear resistance requirements under the vertical force of the column.

[0004] Utility model patent publication number CN212742169U provides a connection structure between a steel column and a concrete cap, belonging to the field of prefabricated assembly technology for bridge engineering. This connection structure utilizes a built-in double-layer flange plate design based on high-strength prestressed anchor bolts at the base of the steel column. Furthermore, the pre-embedded components within the cap are designed to form an integral, unchangeable structure. This patent reduces stress concentration at the base of the column by increasing the force-transmitting anchor length through the double-layer flange plate design; however, it does not address the issue of cap thickness.

[0005] Therefore, providing a connection structure that can reduce the thickness of the platform is a difficult problem that needs to be solved urgently. Utility Model Content

[0006] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a connection structure based on prefabricated columns and bearing platforms.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] According to one aspect of the utility model, a connection structure based on prefabricated columns and pedestals is provided, comprising prefabricated columns, socket-type pedestals, shear-transmitting anchoring mechanisms, anchor beams, high-strength bolts, shear connection mechanisms pre-embedded in the prefabricated columns, and pre-embedded corrugated pipes pre-embedded in the socket-type pedestals, the anchor beams being installed in the socket-type pedestals, the socket-type pedestals being provided with grooves, the prefabricated columns and the grooves being respectively provided with shear-resistant keyways, the shear-transmitting anchoring mechanisms being connected to the shear connection mechanisms, the high-strength bolts being connected to the anchor beams, the shear-transmitting anchoring mechanisms being connected to the socket-type pedestals via high-strength bolts and anchor beams, the prefabricated columns and the grooves being provided with gaps, and high-strength grouting material being poured into the gaps to form shear-resistant keyways.

[0009] As an optimal technical solution, the shear connection mechanism includes an embedded steel casing and two perforated shear plates, the perforated shear plates are provided with periodically arranged first openings, the two perforated shear plates are relatively installed in the embedded steel casing, and the embedded steel casing is located on the outer surface of the prefabricated column.

[0010] As a preferred technical solution, the shear connection mechanism further includes perforated steel bars, which are installed on the first opening of the perforated shear plate.

[0011] As a preferred technical solution, the shear connection mechanism further includes shear nails, which are installed in the embedded steel casing. The shear nails are periodically arranged and perpendicular to the perforated steel bars.

[0012] As a preferred technical solution, the shear transmission and anchoring mechanism includes a side plate, and the side plate is welded to the embedded steel casing.

[0013] As a preferred technical solution, the connection structure further includes an anchor plate, which is installed on the shear transmission anchoring mechanism.

[0014] As a preferred technical solution, the anchor plate and the shear transmission anchoring mechanism are provided with through holes, and the through holes and the embedded corrugated pipe are coaxial.

[0015] As a preferred technical solution, the anchor beam is installed below the groove of the socket-type cap.

[0016] As a preferred technical solution, the anchor beam is provided with a second opening, and the second opening is coaxial with the embedded corrugated pipe.

[0017] As a preferred technical solution, the anchor beam is made of steel trough beams arranged vertically and horizontally.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The utility model connects the prefabricated column and the socket-type cap together by arranging anti-shear keyways on the prefabricated column and the socket-type cap, and pouring high-strength grouting material into the gap to form an anti-shear key, thereby realizing a socket-type connection. The anti-shear key formed has good mechanical effect and improves the overall force-bearing performance.

[0020] 2. The shear transmission anchoring mechanism of the utility model is connected to the socket-type pedestal through high-strength bolts and anchor beams. The high-strength bolts pass through the anchor plate, shear transmission anchoring mechanism, embedded corrugated pipe and anchor beam in sequence to connect the prefabricated column and the socket-type pedestal together, thereby improving the overall force-bearing performance.

[0021] 3. The utility model pre-buries a pre-buried steel pipe sleeve in the prefabricated column, and through the pre-buried steel pipe sleeve and the perforated steel bars and shear nails staggered therein, the strength of the prefabricated column is enhanced, and the overall force-bearing performance is improved.

[0022] 4. The shear transmission and anchoring mechanism of the present invention is provided with side plates, and the prefabricated columns are welded with embedded steel pipe sleeves. The side plates and the embedded steel pipe sleeves are welded to realize the connection between the prefabricated columns and the socket-type caps through the shear transmission and anchoring mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional schematic diagram of the connection structure of the present invention.

[0024] 1. Precast columns; 2. Socket-type caps; 3. Shear-resistant tooth keys; 4. Embedded steel casing; 5. Perforated shear plates; 6. Perforated steel bars; 7. Shear studs; 8. Embedded corrugated pipes; 9. Shear-transmitting anchoring mechanism; 10. Anchor beam; 11. High-strength bolts. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0026] Prefabricated assembly construction techniques and structures are increasingly being used in existing bridge substructures. Prefabrication offers advantages such as fast construction, minimal impact on traffic, and low on-site dust and noise. The columns and abutments of the substructure piers are often connected using various methods, including grouting sleeves, metal bellows, spigot-and-socket connections, and prestressed connections. Compared to the commonly used grouting sleeve connection, the spigot-and-socket connection offers advantages such as ease of construction and lower precision requirements. The abutments utilize a socket-and-socket construction. Prefabricated columns eliminate the need for grouting sleeves and the accompanying thick steel reinforcement, allowing for flexible reinforcement configurations similar to cast-in-place columns and smaller column sizes. The prefabricated columns are transported to the site, hoisted above the abutments, and trial-installed. The column base is then mortared, leveled, positioned, and grouted with high-strength grouting material, followed by maintenance. These construction techniques complete the prefabrication and assembly process. Because the alignment of the rebar does not require a grouting sleeve, only the socket and socket need to be aligned. The latter is much larger, allowing for a larger reserved gap. The smaller inner diameter of the grouting sleeve reduces the precision requirements for assembly, making construction very convenient. Theoretical and experimental research has shown that this connection is reliable, with both normal operating load and seismic performance equivalent to cast-in-place components.

[0027] However, the use of conventional socket-and-spigot connection structures also has many disadvantages. Due to the seismic requirements of the socket-and-spigot connection, the socket depth must reach a certain size to meet the requirements. In theory, it is at least 0.7D (D is the diameter of the column). Therefore, the socket depth of the pedestal must at least meet this requirement, so the remaining thickness under the pedestal is relatively thin. The pedestal must meet the shear resistance problem under the vertical force of the column. Studies have shown that the use of U-shaped steel bars at the socket opening can improve the pedestal's shear resistance and the crack resistance of the slot. However, due to the large socket depth, the shear resistance provided by the low thickness of the remaining base plate is limited, and even with the contribution of the U-shaped steel bars, it is still relatively insufficient. For this reason, the use of a socket-and-spigot structure often requires increasing the thickness of the remaining base plate, which will inevitably increase the overall thickness of the pedestal, thereby increasing the amount of work, and losing the advantages of the socket-and-spigot connection structure.

[0028] The concept of the present invention is as follows: without increasing the thickness of the pedestal, steel casing is embedded on the outside of the prefabricated column and connected to the prefabricated column with shear nails to form a whole; anchor plates are welded on the outside of the steel casing for connection and anchoring with high-strength bolts; the embedded steel casing on the outside of the column is prefabricated as a whole with the pedestal, high-strength bolts are embedded in the pedestal, and the prefabricated column is first connected to the pedestal by socket construction. After reaching the design strength, the high-strength bolts are tensioned and anchored to the anchor plate outside the steel casing, thereby improving the overall force-bearing performance.

[0029] The utility model provides a connection structure based on prefabricated columns and socket caps; the utility model provides shear-resistant keyways in the prefabricated columns and the socket caps, and pours high-strength grouting material into the gaps to form shear-resistant keys, thereby connecting the prefabricated columns and the socket caps together, thus realizing a socket connection. The shear-resistant keys formed have good mechanical effects, thereby improving the overall force-bearing performance. The shear-transmitting anchoring mechanism of the utility model is connected to the socket caps through high-strength bolts and anchor beams, and the high-strength bolts pass through the anchor pads, the shear-transmitting anchoring mechanism, the embedded corrugated pipes and the anchor beams in sequence, thereby connecting the prefabricated columns and the socket caps together, thereby improving the overall force-bearing performance. The utility model pre-embeds embedded steel pipe sleeves in the prefabricated columns, and the embedded steel pipe sleeves and the perforated steel bars and shear nails staggered therein enhance the strength of the prefabricated columns, thereby improving the overall force-bearing performance. The shear transmission anchoring mechanism of the utility model is provided with side plates, and the prefabricated columns are welded with embedded steel pipe sleeves. The side plates and the embedded steel pipe sleeves are welded to realize the connection between the prefabricated columns and the socket-type caps through the shear transmission anchoring mechanism.

[0030] Example 1

[0031] like Figure 1 As shown, a connection structure based on prefabricated columns and pedestals includes a prefabricated column 1, a socket-type pedestal 2, a shear-transmitting anchoring mechanism 9, an anchor beam 10, a high-strength bolt 11, a shear connection mechanism pre-embedded in the prefabricated column 1, and a pre-embedded corrugated pipe 8 pre-embedded in the socket-type pedestal 2, the anchor beam 10 is installed in the socket-type pedestal 2, the socket-type pedestal 2 is provided with a groove, the prefabricated column 1 and the groove are respectively provided with a shear-resistant keyway, the shear-transmitting anchoring mechanism 9 is connected to the shear connection mechanism, the high-strength bolt 11 is connected to the anchor beam 10, the shear-transmitting anchoring mechanism 9 is connected to the socket-type pedestal 2 through the high-strength bolt 11 and the anchor beam 10, a gap is left between the prefabricated column 1 and the groove, and high-strength grouting material is poured into the gap to form a shear-resistant key 3.

[0032] In this embodiment, the precast column 1 is a conventional rectangular reinforced concrete column. The socket end of the precast column 1 is provided with a shear-resistant keyway on the side. The socket cap 2 is a cast-in-place or precast reinforced concrete cap with a groove. The cap is connected to the bridge pile foundation below. The groove is provided with a shear-resistant keyway on the side. The socket end of the precast column 1 is inserted into the groove of the socket cap 2, forming a gap between the precast column 1 and the socket cap 2. A 100MPa high-strength grouting material is poured into the gap to form the shear-resistant key 3. In addition to conventional cap reinforcement, the socket cap 2 is equipped with ordinary steel bars in the socket groove to prevent local cracking in the groove. The high-strength grouting material comprises expansive cement, ordinary cement, gypsum, fly ash, silica fume, mineral powder, polypropylene fiber, and quartz sand, which are mixed in a specific proportion in a specialized chemical factory. Water or other matching components are added in the specified proportions at the site of use and used for grouting the socket.

[0033] The shear connection mechanism includes a pre-embedded steel casing 4 and two perforated shear plates 5. The perforated shear plates 5 are provided with periodically arranged first openings. The two perforated shear plates 5 are relatively mounted within the pre-embedded steel casing 4, which is located on the outer surface of the prefabricated column 1. The shear connection mechanism also includes perforated steel bars 6, which are mounted on the first openings of the perforated shear plates 5. The shear connection mechanism also includes shear studs 7, which are mounted within the pre-embedded steel casing 4. The shear studs 7 are periodically arranged and perpendicular to the perforated steel bars 6.

[0034] In this embodiment, the embedded steel casing 4 is a rectangular structure, and its shape is consistent with the size of the prefabricated column 1. It is embedded in the concrete prefabricated column 1 and arranged at a certain length above the socket end of the prefabricated column 1; a perforated shear plate 5 is welded on the pipe wall of the embedded steel casing 4, and two perforated shear plates 5 are arranged oppositely on the pipe wall of the embedded steel casing 4. The perforated shear plate 5 is provided with a first opening, and the first opening is periodically distributed at a certain interval in the horizontal and vertical directions of the perforated shear plate 5; HRB400 perforated steel bars 6 are passed through the perforated shear through-plate 5, and the perforated steel bars 6 are placed in the corresponding first opening and welded; on the pipe wall of the embedded steel casing 4 where the perforated shear plate 5 is not provided, shear nails 7 are periodically arranged at a certain interval in the horizontal and vertical directions. The shear nails 7 are perpendicular to the perforated steel bars 6, and together form a shear transmission structure of the column and the embedded casing to form a combined section.

[0035] The shear transmission anchoring mechanism 9 includes a side plate, and the side plate is welded to the embedded steel casing 4. The connection structure also includes an anchor plate, and the anchor plate is installed on the shear transmission anchoring mechanism 9.

[0036] In this embodiment, the shear transmission anchoring mechanism 9 is arranged on the outside of the embedded steel casing 4, above the socket-type pedestal 2, and the side plates of the shear transmission anchoring mechanism 9 are welded to the embedded steel casing 4 to transmit the force of the embedded steel casing 4 to the shear transmission anchoring mechanism 9. The bottom plate of the shear transmission anchoring mechanism 9 is connected to the top plate of the socket-type pedestal 2, and an anchor plate is arranged at the top plate position of the shear transmission anchoring mechanism 9; the shear transmission anchoring mechanism 9 is a steel box-shaped structure.

[0037] The anchor plate and shear anchor mechanism 9 are provided with through-holes, which are coaxial with the embedded corrugated pipe 8. The anchor beam 10 is installed below the groove of the socket-and-spigot cap 2. The anchor beam 10 is provided with a second opening, which is coaxial with the embedded corrugated pipe 8. The anchor beam 10 is made of steel channel beams arranged vertically and horizontally.

[0038] In this embodiment, a bellows 8 is embedded in the spigot-and-socket cap 2. The through-hole and the second opening are coaxial with the embedded bellows 8, facilitating the passage of high-strength bolts 11. An anchor beam 10 is provided below the groove of the spigot-and-socket cap 2. The anchor beam 10 utilizes a steel channel beam arranged vertically and horizontally. The lower ends of the high-strength bolts 11 are anchored to the steel channel beam. The bolts are embedded through the openings of the anchor beam 10 and pass through the embedded bellows 8. The upper ends of the embedded bellows 8 are anchored to the shear-transmitting anchor mechanism 9. The main construction steps are as follows: the anchor beam 10, bellows 8, and high-strength bolts 11 are first embedded in the concrete cap, and then concrete is poured along with the cap reinforcement to form the cap. The prefabricated column 1, the shear connection mechanism embedded in the prefabricated column and the shear transmission anchoring structure 9 welded thereon are transported to the site for socket construction, mortaring, column positioning, installation in place, and pouring of high-strength grouting material; after reaching the strength, it is formed into a whole and a shear-resistant tooth key 3 is formed, and the high-strength bolt 11 is tensioned to the design force to form a combined structure connected with the high-strength bolt 11 and the socket-type base 2.

[0039] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A connection structure based on prefabricated columns and caps, characterized in that: The invention comprises a prefabricated column (1), a socket-type pedestal (2), a shear-transmitting anchoring mechanism (9), an anchor beam (10), a high-strength bolt (11), a shear connection mechanism embedded in the prefabricated column (1), and a pre-embedded corrugated pipe (8) embedded in the socket-type pedestal (2); the anchor beam (10) is installed in the socket-type pedestal (2); the socket-type pedestal (2) is provided with a groove; the prefabricated column (1) and the groove are respectively provided with a shear-resistant tooth keyway; the shear-transmitting anchoring mechanism (9) is connected to the shear connection mechanism; the high-strength bolt (11) is connected to the anchor beam (10); the shear-transmitting anchoring mechanism (9) is connected to the socket-type pedestal (2) via the high-strength bolt (11) and the anchor beam (10); a gap is left between the prefabricated column (1) and the groove, and a high-strength grouting material is poured into the gap to form a shear-resistant tooth key (3).

2. The connection structure based on prefabricated columns and caps according to claim 1, characterized in that: The shear connection mechanism comprises a pre-buried steel casing (4) and two perforated shear plates (5), wherein the perforated shear plates (5) are provided with periodically arranged first openings, and the two perforated shear plates (5) are relatively installed in the pre-buried steel casing (4), and the pre-buried steel casing (4) is located on the outer surface of the prefabricated column (1).

3. The connection structure based on prefabricated columns and caps according to claim 2, characterized in that: The shear connection mechanism further comprises a perforated steel bar (6), and the perforated steel bar (6) is installed on the first opening of the perforated shear plate (5).

4. The connection structure based on prefabricated columns and caps according to claim 3 is characterized in that: The shear connection mechanism further comprises shear nails (7), which are installed in the embedded steel casing (4). The shear nails (7) are periodically arranged and perpendicular to the perforated steel bars (6).

5. The connection structure based on prefabricated columns and caps according to claim 1 is characterized in that: The shear transmission anchoring mechanism (9) comprises a side plate, and the side plate is welded to the embedded steel casing (4).

6. The connection structure based on prefabricated columns and caps according to claim 1, characterized in that: The connection structure also includes an anchor plate, which is mounted on the shear transmission anchoring mechanism (9).

7. The connection structure based on prefabricated columns and caps according to claim 6, characterized in that: The anchor plate and the shear-transmitting anchoring mechanism (9) are provided with through holes, and the through holes and the embedded corrugated pipe (8) are coaxial.

8. The connection structure based on prefabricated columns and caps according to claim 1, characterized in that: The anchor beam (10) is installed below the groove of the socket-type support (2).

9. The connection structure based on prefabricated columns and caps according to claim 1, characterized in that: The anchor beam (10) is provided with a second opening, and the second opening is coaxial with the embedded corrugated pipe (8).

10. The connection structure based on prefabricated columns and caps according to claim 1, characterized in that: The anchor beam (10) is an anchor beam (10) made of steel channel beams arranged vertically and horizontally.

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