A connecting construction method of a fabricated pier column

Abstract

The application provides a connecting construction method of a fabricated pier column, which comprises the following steps: prefabricating pier column segments, the pier column is divided into multiple segments and prefabricated in a prefabrication yard, the height of the multiple segments supported and stacked together through mounting supports is the same as the design height of the pier column, then the prefabricated pier column segments are transported to a construction site, and the lower pier column, the mounting supports and the upper pier column are hoisted to the pier base measured in advance and installed. Compared with the traditional technical solution, the method has the advantages that the weight of the pier column during assembly is greatly reduced, the transportation and hoisting are facilitated, and the method is convenient for popularization and application in mountainous areas and areas with poor traffic; meanwhile, the connecting mode between the pier column segments is improved, the upper and lower pier columns are reliably stressed, the mounting supports are used to connect the upper and lower pier column segments, the exposed steel bars are connected through the winding steel bars of the spiral structure, the fitting of the mounting groove and the vertical rod can also increase the shear resistance, and the shear resistance and the anti-seismic performance of the prefabricated assembled pier column are stably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a connection construction method for assembled pier columns. Background Art

[0002] With the continuous advancement of my country's urbanization process, traffic congestion has become increasingly prominent and has gradually become a key factor affecting urban development. The development of building industrialization has brought about the development direction of building assembly. Urban bridges, as the preferred solution to my country's traffic congestion problem, have been widely used in large, medium and small cities in China. With the development of prefabrication and assembly technology, prefabricated piers have also been gradually used in bridge construction. Prefabricated piers can be prefabricated in factories and in a standardized manner, and have the advantages of controllable quality, fast construction speed, and no influence from the construction environment.

[0003] At present, prefabricated piers are all based on sleeve connection technology, that is, a connection sleeve is preset in the prefabricated pier, and embedded steel bars are set on the top surface of the pier. When the prefabricated pier is installed on the pier, the embedded steel bars on the pier are inserted into the sleeve, and then the sleeve is grouting. The connection between the steel bars and the sleeve is ensured by grouting. Although this method avoids some shortcomings of cast-in-place construction to a certain extent, it also has some shortcomings: First, prefabricated assembled piers, concrete beams, slabs, columns and other components are cast in the factory and then transported to the project site for assembly and forming. Its construction speed is fast and the appearance is beautiful, but when connecting bridge piers, due to the existing prefabricated piers, All of them are cast from concrete and then transported. They are too heavy and require unconventional large-scale equipment for lifting. The construction is difficult and requires high hardening of the site, which in turn increases the overall construction cost. For mountainous areas with poor transportation conditions, the transportation of large components and the entry of large equipment are difficult, which also limits the application of prefabricated piers in mountain bridges. Secondly, prefabricated piers are often transported and connected in multiple sections, and the connection between the upper and lower supporting structures is usually made by gluing, etc., resulting in poor shear resistance between the connection sections and weak seismic resistance. The overall performance after assembly is insufficient compared to on-site casting construction. Summary of the Invention

[0004] The purpose of the present invention is to provide a connection construction method for prefabricated piers, which solves the problems of existing prefabricated piers, such as large dead weight, difficulty in loading and unloading and assembly, limited applicable scenarios, and weak shear resistance and seismic resistance after connection and assembly.

[0005] The embodiment of the present invention is achieved through the following technical solution: A connection construction method for assembled piers, comprising the following steps:

[0006] S1. Prefabricated pier column segments: The pier column is divided into multiple segments and prefabricated in the prefabrication yard. Adjacent pier column segments are supported by mounting brackets and stacked together to the same height as the pier column design height. Each pier column segment has a through hole in the middle and mounting and retaining slots at the top and bottom. Multiple circumferential reinforcement bars are installed in each pier column segment according to the pier column reinforcement design requirements. Multiple embedded reinforcement bars welded to the circumferential reinforcement bars are also circumferentially and equidistantly arranged. The ends of the embedded reinforcement bars extend vertically upward and are connected to threaded sleeves.

[0007] S2. Transport the prefabricated pier column segments to the construction site and divide them into upper pier columns and lower pier columns in pairs. Hoist the lower pier columns to the pre-determined pier foundation and install them.

[0008] S3. Install vertical rods at the positions of the multiple mounting slots on the top surface of the lower pier. Adjacent vertical rods are welded and fixed together with horizontal rods. An oblique rod is also welded and fixed between two mirror-symmetrical vertical rods. The vertical rods, horizontal rods, and oblique rods together constitute the mounting bracket.

[0009] S4. Hoist the upper pier column to the top of the mounting bracket, and align the mounting groove on the bottom surface of the upper pier column with the top of the vertical rod, and fix the vertical rod and the upper pier column;

[0010] S5. Connect the two ends of the exposed steel bar to the threaded sleeves on the bottom surface of the upper pier column and the top surface of the lower pier column respectively. Then, arrange the wrapped steel bar outside the exposed steel bar. The wrapped steel bar has a spiral structure. The vertical rod has multiple through-holes spaced evenly from top to bottom. The wrapped steel bar passes through the multiple through-holes in sequence from top to bottom and is welded to the exposed steel bar.

[0011] S6. Install a wet joint housing on the exterior of the mounting bracket. The wet joint housing is composed of two mirror-image structures that interlock. The upper and lower ends of the wet joint housing are respectively secured to the slots on the outer edges of the upper and lower piers. Subsequently, concrete is poured downward through the through hole in the middle of the upper pier. After the concrete solidifies, the wet joint housing is removed.

[0012] S7. According to the above construction method, a new installation bracket is arranged above this group of upper piers, and a new group of lower piers is hoisted to the top of the installation bracket. The construction is repeated to complete the assembly of subsequent pier segments.

[0013] Furthermore, in step S1, the embedded steel bars are distributed in two inner and outer ring shapes.

[0014] Furthermore, in step S1, the latching groove is located at the outer edges of the top and bottom surfaces of the pier column segment, and the installation groove is located at the inner edges of the top and bottom surfaces of the pier column segment.

[0015] Furthermore, in step S2, when transporting and lifting the pier column segment, the crane is connected via bolts with lifting eyes on the pier column segment.

[0016] Furthermore, in step S3, two oblique rods are cross-arranged between the two mirror-symmetrical vertical rods, and the two oblique rods are arranged in an X-shaped structure.

[0017] Furthermore, in step S3, the vertical rod is an I-beam.

[0018] Furthermore, in step S3, horizontal bars are provided at both the upper and lower ends of the vertical bars.

[0019] Furthermore, in step S5, the exposed steel bars of the inner ring and the wrapped steel bars passing through the perforations can be connected and fixed by binding with steel wires.

[0020] Furthermore, in step S6, the wet joint shell is made of UHPC material.

[0021] Furthermore, in step S6, a plurality of screws are radially arranged at equal angles on the mounting bracket. When the wet joint shell is installed, the screws are passed through the wet joint shell. After the wet joint shell is engaged with the slot, a nut is used to thread the screws and finally lock the wet joint shell.

[0022] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0023] Compared with traditional technical solutions, the advantage of this method is that it greatly reduces the weight of the pier during assembly, is easy to transport and hoist, and is easy to promote and apply in mountainous areas and areas with inconvenient transportation; at the same time, it improves the connection method between the pier segments. Since the upper and lower piers are reliably stressed, the upper and lower pier segments are connected by mounting brackets, and the exposed steel bars are connected by spirally wrapped steel bars. The fit between the mounting groove and the vertical rod can also increase the shear resistance, so that the shear resistance and seismic performance of the prefabricated assembled piers are steadily improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A construction flow chart of a connection construction method for an assembled pier provided by the present invention;

[0026] Figure 2 This is a schematic diagram of the structure after the upper pier, mounting bracket and lower pier are connected in the present invention;

[0027] Figure 3 A top view of the mounting bracket of the present invention;

[0028] Figure 4 Schematic diagram of the three-dimensional structure of the mounting bracket in the present invention;

[0029] Figure 5 Schematic diagram of the three-dimensional structure of the lower pier column in the present invention;

[0030] Figure 6 This is a schematic diagram of the three-dimensional structure of the assembled pier column of the present invention after assembly;

[0031] Figure 7 This is a cross-sectional view of the assembled pier column of the present invention after completion of assembly.

[0032] Icons: 1. Upper pier; 2. Lower pier; 3. Mounting bracket; 31. Vertical bar; 311. Perforation; 32. Horizontal bar; 33. Diagonal bar; 4. Embedded steel bars; 41. Threaded sleeve; 5. Exposed steel bars; 6. Wrapped steel bars; 7. Mounting slot; 8. Card slot; 9. Wet joint shell. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0035] A method for connecting and constructing assembled pier columns, such as Figure 1 As shown, use Figure 2-Figure 7 The assembled pier column and the mounting bracket 3 shown specifically include the following steps:

[0036] S1. Prefabricated pier column segments: The pier column is divided into multiple segments and prefabricated in a prefabrication yard. The segments are divided into mirror-image upper pier columns 1 and lower pier columns 2, with pairs of segments. Adjacent pier column segments are supported by mounting brackets 3 and stacked together to the same height as the designed pier column height. Each pier column segment has a through hole in the middle. In this embodiment, the pier column segments are annular in structure with a through hole in the middle.

[0037] like Figure 3 and Figure 4As shown, the mounting bracket 3 is composed of a plurality of vertical rods 31, a horizontal rod 32 and an oblique rod 33. The plurality of vertical rods 31 are arranged circumferentially about the diameter of the upper pier 1 and the lower pier 2. Adjacent vertical rods 31 are welded and fixed by horizontal rods 32. The horizontal rod 32 is a plate structure. The upper and lower ends of the vertical rods 31 are provided with horizontal rods 32. An oblique rod 33 is also connected between the two mirror-symmetrical vertical rods 31.

[0038] like Figure 3 and Figure 4 As shown, two oblique rods 33 are cross-set between the two mirror-symmetrical vertical rods 31, and the two oblique rods 33 are arranged in an X-shaped structure, wherein the two ends of one oblique rod 33 are respectively connected to the top and bottom ends of the two mirror-symmetrical vertical rods 31, and the two ends of the other oblique rod 33 are respectively connected to the bottom and top ends of the two mirror-symmetrical vertical rods 31. Multiple oblique rods 33 intersect at the center position of the connecting piece and are welded and fixed.

[0039] In this embodiment, the vertical rod 31 is an I-beam, and a plurality of through holes 311 are evenly spaced from top to bottom on the rod body of the vertical rod 31 .

[0040] like Figure 5 and Figure 7 As shown, the bottom surface of the upper pier 1 and the top surface of the lower pier 2 are both provided with mounting grooves 7 at positions corresponding to the vertical rods 31. The mounting grooves 7 are consistent in size with the cross-section of the vertical rods 31. Figure 6 and Figure 7 As shown, the outer edges of the bottom surface of the upper pier 1 and the top surface of the lower pier 2 are both provided with a clamping groove 8, which is located at the outer edges of the top and bottom surfaces of the pier segment, while the installation groove 7 is located at the inner edges of the top and bottom surfaces of the pier segment.

[0041] In this embodiment, Figure 5 As shown, a plurality of circumferential reinforcements are arranged in each pier segment according to the reinforcement design requirements of the pier, and a plurality of embedded steel bars 4 welded to the circumferential reinforcements are arranged equidistantly in the circumference. The ends of the embedded steel bars 4 extend vertically upward and are connected to threaded sleeves 41. The plurality of embedded steel bars 4 are distributed in two circles, inner and outer.

[0042] S2. Transport the prefabricated pier column segments to the construction site, hoist the lower pier column 2 to the pre-determined pier foundation and install it. When transporting and hoisting the pier column segments, connect the crane via the bolts with lifting rings on the pier column segments;

[0043] S3. Install the vertical rods 31 vertically corresponding to the positions of the multiple mounting grooves 7 on the top surface of the lower pier 2. During assembly, first insert the lower ends of the multiple vertical rods 31 into the mounting grooves 7 on the top surface of the lower pier 2, then use the cross rods 32 to weld the adjacent vertical rods 31 together, and finally weld the diagonal rods 33.

[0044] S4, hoist the upper pier column 1 to the top of the mounting bracket 3, and make the mounting groove 7 on the bottom surface of the upper pier column 1 fit with the top of the vertical rod 31 one by one, and fix the vertical rod 31 and the upper pier column 1;

[0045] S5, such as Figure 2 and Figure 3 As shown, a plurality of exposed steel bars 5 are arranged circumferentially around the outer periphery of the mounting bracket 3. The exposed steel bars 5 are arranged in two circles with the axis of the upper pier column 1 and the lower pier column 2 as the center point, and the two ends of the exposed steel bars 5 are respectively vertically connected to the threaded sleeves 41 at the corresponding positions on the bottom surface of the upper pier column 1 and the top surface of the lower pier column 2. Figure 2 、 Figure 3 and Figure 4 As shown, the multiple exposed steel bars 5 of the inner circle and the multiple exposed steel bars 5 of the outer circle are connected and fixed by winding steel bars 6. The winding steel bars 6 have a spiral structure. One winding steel bar 6 passes through the multiple through-holes 311 from top to bottom and is connected to the multiple exposed steel bars 5 of the inner circle. The connection method can be welding or steel wire bundling. The spirally wound winding steel bars 6 are connected to the multiple exposed steel bars 5 in turn. Compared with the traditional concrete pier column glue connection, this connection method greatly improves the shear resistance and seismic performance of the pier column after forming during assembly, and is convenient to construct and efficient.

[0046] S6, such as Figure 6 and Figure 7 As shown, a wet joint shell 9 is provided on the outside of the mounting bracket 3. The wet joint shell 9 is composed of two mirror-image structures that are joined together. The upper and lower ends of the wet joint shell 9 are respectively fixed with the card slots 8 on the outer edges of the upper and lower piers. When the upper pier 1, the connector and the lower pier 2 are connected as a whole, the wet joint shell 9 made of UHPC material is used to embrace the cavity between the upper pier 1 and the lower pier 2. In this embodiment, the wet joint shell 9 is in the form of two semicircular structures. The upper and lower edges of the two are fixed by being joined with the card slots 8 to achieve the splicing of the wet joint shell 9. Subsequently, concrete can be poured downward from the through hole of the upper pier 1 until the concrete fills the gaps between the lower pier 2, the upper pier 1 and the connector. After the concrete hardens, the wet joint shell 9 can be removed.

[0047] Taking into account the different construction environments, there is a chance of falling when only using the slot 8 to fix the wet joint shell 9, so a plurality of screws can be arranged radially at equal angles on the mounting bracket 3. When installing the wet joint shell 9, the screw is passed through the wet joint shell 9. After the wet joint shell 9 is engaged with the slot 8, the nut is used to thread the screw and finally lock the wet joint shell 9.

[0048] S7. According to the above construction method, a new mounting bracket 3 is arranged above this group of upper pier columns 1, and a new group of lower pier columns 2 is hoisted to the top of the mounting bracket 3. The construction is cyclical to complete the assembly of subsequent pier column segments.

[0049] Compared with traditional technical solutions, the advantage of this method is that it greatly reduces the weight of the pier during assembly, is easy to transport and hoist, and is easy to promote and apply in mountainous areas and areas with inconvenient transportation. At the same time, it improves the connection method between the pier segments. Since the upper and lower piers are reliably stressed, the upper and lower pier segments are connected by mounting brackets 3, and the exposed steel bars 5 are connected by spirally wrapped steel bars 6. The fit between the mounting groove 7 and the vertical rod 31 can also increase the shear resistance, so that the shear resistance and seismic resistance of the prefabricated assembled pier are steadily improved.

[0050] In this embodiment, the lengths of the upper pier 1, the lower pier 2 and the mounting bracket 3 can be adjusted. The designed pier height can be stacked by stacking multiple pairs of upper piers 1, lower piers 2 and mounting brackets 3, and the docked upper and lower piers are connected and fixed in the above-mentioned manner.

[0051] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for connecting and constructing assembled pier columns, characterized in that: The following steps are involved: S1. Prefabricated pier column segments: The pier column is divided into multiple segments and prefabricated in a prefabrication yard. The adjacent pier column segments are supported by mounting brackets (3) and stacked together to a height that is the same as the designed height of the pier column. Each pier column segment has a through hole in the middle, and a mounting groove (7) and a clamping groove (8) are provided on the top and bottom. A plurality of circumferential reinforcements are provided in each pier column segment according to the reinforcement design requirements of the pier column, and a plurality of embedded reinforcements (4) welded to the circumferential reinforcements are provided at equal intervals in the circumference. The ends of the embedded reinforcements (4) extend vertically upward and are connected to threaded sleeves (41); S2, transporting the prefabricated pier column segments to the construction site, and dividing them into upper pier columns (1) and lower pier columns (2) in pairs, hoisting the lower pier columns (2) to the pier foundation determined in advance and installing them; S3, corresponding to the positions of the multiple mounting grooves (7) on the top surface of the lower pier column (2), vertically installing vertical rods (31), adjacent vertical rods (31) are welded and fixed by horizontal rods (32), and an oblique rod (33) is also welded and fixed between two mirror-symmetrical vertical rods (31), and the vertical rods (31), horizontal rods (32) and oblique rods (33) together constitute the mounting bracket (3); S4, hoisting the upper pier column (1) to the top of the mounting bracket (3), and making the mounting groove (7) on the bottom surface of the upper pier column (1) fit in with the top of the vertical rod (31) one by one, fixing the vertical rod (31) and the upper pier column (1); S5, the two ends of the exposed steel bar (5) are respectively connected to the threaded sleeves (41) on the bottom surface of the upper pier (1) and the top surface of the lower pier (2), and then the wrapped steel bar (6) is arranged outside the exposed steel bar (5), and the wrapped steel bar (6) has a spiral structure. The rod body of the vertical rod (31) is provided with a plurality of through holes (311) at equal intervals from top to bottom. The wrapped steel bar (6) passes through the plurality of through holes (311) in sequence from top to bottom and is welded to the exposed steel bar (5); S6. A wet joint shell (9) is provided on the outside of the mounting bracket (3). The wet joint shell (9) is composed of two mirror-image structures that are joined together. The upper and lower ends of the wet joint shell (9) are respectively fixed to the slots (8) on the outer edges of the upper and lower piers. Subsequently, concrete is poured downward through the through hole in the middle of the upper pier (1). After the concrete solidifies, the wet joint shell (9) is removed. S7. According to the above construction method, a new mounting bracket (3) is arranged above the upper pier column (1) of this group, and a new group of lower pier columns (2) are hoisted to the top of the mounting bracket (3), and the construction is circulated to complete the assembly of subsequent pier column segments.

2. The connection construction method of a prefabricated pier according to claim 1, characterized in that: In step S1, the embedded steel bars (4) are distributed in two rings, inner and outer.

3. The connection construction method of a prefabricated pier according to claim 1, characterized in that: In step S1, the clamping groove (8) is located at the outer edges of the top and bottom surfaces of the pier column segment, and the installation groove (7) is located at the inner edges of the top and bottom surfaces of the pier column segment.

4. The connection construction method of a prefabricated pier according to claim 1, characterized in that: In step S2, when transporting and lifting the pier column segment, the crane is connected through the bolts with lifting eyes on the pier column segment.

5. The connection construction method of a prefabricated pier column according to claim 1, characterized in that: In step S3, two oblique rods (33) are intersected between the two mirror-symmetrical vertical rods (31), and the two oblique rods (33) are arranged in an X-shaped structure.

6. The connection construction method of a prefabricated pier column according to claim 1, characterized in that: In step S3, the vertical rod (31) is an I-beam.

7. The connection construction method of a prefabricated pier according to claim 1, characterized in that: In step S3, a horizontal bar (32) is provided at both the upper and lower ends of the vertical bar (31).

8. The connection construction method of an assembled pier column according to claim 1, characterized in that: In step S5, the exposed steel bars (5) of the inner ring and the wrapped steel bars (6) passing through the perforations (311) are connected and fixed by binding with steel wires.

9. The method for connecting and constructing assembled piers according to claim 1, characterized in that: In step S6, the wet joint shell (9) is made of UHPC material.

10. The method for connecting and constructing assembled piers according to claim 1, characterized in that: In step S6, a plurality of screws are radially arranged at equal angles on the mounting bracket (3). When the wet joint housing (9) is installed, the screws are passed through the wet joint housing (9). After the wet joint housing (9) is engaged with the slot (8), a nut is used to thread the screws and finally lock the wet joint housing (9).

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