CN219032904U - Quick high-strength connection structure of prefabricated pipe pile and bent cap with prefabricated filling core - Google Patents
Quick high-strength connection structure of prefabricated pipe pile and bent cap with prefabricated filling core Download PDFInfo
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- CN219032904U CN219032904U CN202223360356.5U CN202223360356U CN219032904U CN 219032904 U CN219032904 U CN 219032904U CN 202223360356 U CN202223360356 U CN 202223360356U CN 219032904 U CN219032904 U CN 219032904U
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Abstract
A rapid high-strength connection structure of a prefabricated pipe pile and a bent cap with a prefabricated filling core comprises the prefabricated bent cap, the prefabricated pipe pile and the prefabricated filling core; pre-burying a metal corrugated pipe in the prefabricated bent cap, forming an opening on the pile top of the prefabricated pipe pile, and welding a connecting reinforcing steel bar on the top of the prefabricated filling core; the construction method comprises the following steps: firstly, the pipe pile is driven to a designed elevation, then a prefabricated filling core is placed into an opening at the top of the pipe pile, and then UTFC is injected into an assembly gap between the prefabricated filling core and the prefabricated pipe pile in a pressing mode and maintained to form strength; hoisting the prefabricated cover beam, placing the prefabricated cover beam on a prefabricated filling core, extending a connecting steel bar at the top end of the prefabricated filling core into an embedded metal corrugated pipe of the prefabricated cover beam, and injecting UTFC in a pressing mode; the utility model has the advantages of good earthquake resistance, excellent durability, high construction speed, lower requirement on the positioning precision of the pipe pile construction plane, small anchoring length required by connecting the reinforcing steel bars, and the like.
Description
Technical Field
The utility model relates to an assembled bridge lower structure in the field of bridge engineering, in particular to a rapid high-strength connection structure of a prefabricated pipe pile and a capping beam with prefabricated filling cores.
Background
In recent years, the prefabricated segment assembly technology is widely applied to bridge engineering, and the prefabricated bridge structure has the main advantages that: the construction period is shortened, the construction quality is guaranteed, the safety of constructors in dangerous zones in bridge construction is guaranteed, and the environment and traffic near the construction are guaranteed to be less disturbed. The single pile of the large-diameter prefabricated pipe pile has high bearing capacity, the on-site drilling of the cast-in-place pile can be avoided by adopting the large-diameter prefabricated pipe pile, the cast-in-situ operation is reduced, the time for pouring concrete is saved, and the construction period is greatly saved. The prefabricated capping beam can reduce the field work load and save the construction period. The main design difficulties are therefore: how to ensure that the stress performance of the connection part of the prefabricated bent cap and the prefabricated pipe pile can meet the requirement which needs to be achieved, and the prefabricated bent cap can be conveniently realized in construction, has simple structure and furthest reduces the occupied site and the field operation time.
The prefabricated assembly structure follows the principle of 'strong nodes and weak components', has high requirements on the quality and performance of the connection nodes, and the structural characteristics of the thin wall hollow of the large-diameter prefabricated pipe pile determine the unavoidable requirement of concrete core filling at the connection nodes to enhance the mechanical properties. At present, common connection modes such as slot connection and socket connection all need cast-in-place core filling concrete, for example, patent application with the application number of CN202120323642.0 discloses a solid-web arch bridge system assembled by UHPC prefabricated corrugated plate segments, and all the prefabricated segments are spliced into a whole through finish rolling screw thread reinforcing steel bars and epoxy resin mortar; the UHPC corrugated plate main arch ring is pre-assembled firstly, hoisting construction is adopted after the pre-assembled main arch ring is qualified, the main arch ring is hoisted in place and then is folded on a full framing, then pouring is needed, the pouring workload is large, the time consumption for forming and maintaining is long, and the rapid construction speed of the bridge substructure is limited.
Disclosure of Invention
In order to solve the defects in the prior art, the utility model aims to provide a rapid high-strength connecting structure for a prefabricated pipe pile and a bent cap with a prefabricated filling core, which has the advantages of good anti-seismic performance, excellent durability, high prefabricated assembly type construction speed, small influence on traffic and surrounding environment of a construction site, low requirement on construction precision, industrialized production of components, easy quality control and the like.
In order to achieve the above object, the present utility model is realized by the following technical scheme:
a rapid high-strength connection structure of a prefabricated pipe pile and a bent cap with a prefabricated filling core comprises a prefabricated bent cap 1, a prefabricated pipe pile 3 and a prefabricated filling core 2;
a metal corrugated pipe 4 is pre-buried in the prefabricated bent cap 1;
the prefabricated pipe pile 3 is provided with a pipe pile opening 18 and a pipe pile end plate 19;
a reserved connecting steel bar 5 is arranged in the prefabricated filling core 2; the top of the prefabricated filling core 2 is provided with a steel supporting plate 9, and the connecting steel bars 5 and the steel supporting plate 9 are welded into a whole;
the prefabricated filling core 2 is placed in a tubular pile opening 18 of the prefabricated tubular pile 3, and an assembly gap 20 between the prefabricated filling core 2 and the prefabricated tubular pile 3 is connected by grouting;
the prefabricated capping beam 1 is arranged on the prefabricated filling core 2, the number and the positions of the metal corrugated pipes 4 and the reserved connecting steel bars 5 are corresponding, the metal corrugated pipes and the reserved connecting steel bars are in butt joint, and the prefabricated capping beam 1 and the prefabricated filling core 2 are connected in a grouting mode.
The rubber grout stop ring 11 is arranged in a groove arranged at the bottom of the prefabricated filling core 2, and the section of the rubber grout stop ring 11 is in a trapezoid and rectangular combined shape.
And the grouting materials are super-toughness fiber reinforced concrete UTFC.
The steel supporting plate 9 is round, the diameter of the steel supporting plate is the same as the outer diameter of the precast tubular pile 3, and a grouting hole 12 and a grouting hole 13 are symmetrically formed in the steel supporting plate 9.
The length L1 of the reserved connection reinforcing steel bar 5 should satisfy the following formula:
wherein: l (L) 1 : the anchoring length (mm) of the connecting steel bars in the UTFC grouting material;
c 1 : the value is 0.104;
c 2 : the relative dimensional coefficient of the two-dimensional shape,
D b is the diameter (mm) of the steel bar, D d Is the diameter (mm) of the corrugated pipe;
f u : ultimate strength (MPa) of the joint rebar;
f UTFC : UTFC concrete 150mm cube standard test piece 28d compressive strength (MPa).
Height L of prefabricated filling core 2 2 The following formula should be satisfied:
L 2 ＝1.5D p +0.05l
wherein: l (L) 2 : the length (m) of the prefabricated filling core in the prefabricated pipe pile;
D p : prefabricating the outer diameter (m) of the tubular pile;
l: and calculating the height (m) of the precast tubular pile, wherein when the precast tubular pile is not exposed out of the ground surface, the value of l is 4, and when the precast tubular pile is used as a pile integrated pier, the value of l is calculated according to the actual pier height.
The precast tubular pile 3 is a high-strength concrete tubular pile (PHC tubular pile) with the pile body concrete strength grade of C80 and above or a high-strength concrete tubular pile (PRC tubular pile) with a main reinforcement in the form of a prestressed steel bar and common reinforcement combined configuration.
Compared with the prior art, the utility model has the advantages that:
1. the utility model provides a connecting structure of a prefabricated bent cap and a prefabricated tubular pile, wherein a prefabricated filling core enhances the connecting part of the prefabricated tubular pile and the prefabricated bent cap, improves the anti-seismic energy consumption capacity of a potential plastic hinge area of the prefabricated tubular pile, and compared with the existing method for placing a reinforcement cage and casting filling core concrete in situ, the prefabricated filling core avoids a large amount of cast-in-situ operation on a construction site, and factory prefabrication ensures the reliable quality of the filling core.
2. The assembly gap between the prefabricated pipe pile and the prefabricated filling core is treated in a grouting mode, and the prefabricated component is connected with the prefabricated capping beam grouting corrugated pipe through the reserved connecting steel bars on the prefabricated filling core, so that the construction is convenient, the connection strength can be formed quickly, the requirement on the construction precision is low, and the connection quality is reliable.
Drawings
Fig. 1 is a schematic diagram of a connection structure between a prefabricated pipe pile and a prefabricated capping beam by adopting UTFC.
Fig. 2 is a specific explanatory diagram of a connection structure between a prefabricated capping beam and a prefabricated tubular pile.
Fig. 3 is a schematic view of a precast tubular pile, in which: fig. 3 (b) is a cross-sectional view of fig. 3 (a).
Fig. 4 is a schematic diagram of arrangement of a pre-buried metal bellows at the top of a prefabricated capping beam.
Fig. 5 is a schematic illustration of a preformed core.
Fig. 6 is a schematic diagram of a preformed core reinforcement.
Fig. 7 is a schematic view of a prefabricated bent cap rebar arrangement.
Fig. 8 is a schematic top view of a preformed core.
FIG. 9 is a schematic view of a detail of a rubber grout stop ring at the bottom of the preformed core.
In the figure: 1. prefabricating a cover beam; 2. prefabricating filling cores; 3. prefabricating a tubular pile; 4. pre-burying a metal corrugated pipe; 5. reserving connecting steel bars; 6. UTFC; 7. leveling the mortar layer; 8. a concrete outer ring of the bent cap; 9. a steel pallet; 10. pile top hoops; 11. rubber grout stop ring; 12. grouting holes; 13. a pulp outlet hole; 14. a top steel bar; 15. distributing reinforcing steel bars; 16. covering stirrups; 17. a bottom reinforcing bar; 18. perforating the tubular pile; 19. a tubular pile end plate; 20. an assembly gap; 21. and (5) reinforcing the pipe pile.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
The utility model aims to solve the problem of connection between a prefabricated pipe pile and a prefabricated capping beam, and provides a rapid high-strength connection structure of the prefabricated pipe pile and the capping beam with a prefabricated filling core, which is shown in figures 1 and 2 and comprises a prefabricated capping beam 1, a prefabricated pipe pile 3 and a prefabricated filling core 2; the prefabricated capping beam 1, the prefabricated filling core 2 and the prefabricated pipe pile 3 are prefabricated in a factory and transported to a construction site.
A metal corrugated pipe 4 is pre-buried in the prefabricated bent cap 1; the width of the prefabricated capping beam 1 is 1.6m, the height is 1.2m, the length is valued along with the actual requirements of engineering, and the prefabricated capping beam 1 and the prefabricated filling core 2 are both made of C50 concrete.
The reinforcing steel bars 14 at the top of the prefabricated cover beam 1 adopt reinforcing steel bars with the phi of 28mm of HRB 400. The distributed steel bars 15 of the prefabricated bent cap 1 are phi 28mm steel bars of HRB400, and the distance between the steel bars is 85mm-135mm. The stirrup 16 of the prefabricated cover beam 1 adopts reinforcing steel bars with the phi of 12mm of HRB400, the spacing is 150mm within the span-middle 2m range of the prefabricated cover beam 1, and the spacing of the rest positions is 100mm. The reinforcing steel bars 17 at the bottom of the prefabricated bent cap 1 are reinforcing steel bars with the phi of 28mm of HRB400, and a concrete reinforcing steel bar distribution diagram is shown in a distribution diagram 7. The diameter of the pre-buried metal corrugated pipe 4 is 65mm, the length is the same as the height of the prefabricated capping beam 1, the pre-buried metal corrugated pipe 4 is annularly arranged in the same arrangement mode as the longitudinal steel bars above the prefabricated filling cores 2, and referring to fig. 4, the pre-buried metal corrugated pipe 4 is bound with the steel bars of the prefabricated capping beam 1 by binding wires.
As shown in fig. 3, the prefabricated pipe pile 3 is specifically a prestressed concrete pile with a circular section formed by adopting a centrifugal and prestress process, a pipe pile reinforcement 21 is arranged in the pile, and a pipe pile opening 18 is formed on the prefabricated pipe pile 3 by adopting welding or mechanical pile splicing; the tubular pile open hole 18 is a circular open hole, the diameter of the hole is 900mm, the thickness of the prefabricated tubular pile 3 is 150mm, and the outer diameter of the prefabricated tubular pile 3 is 1200mm. The pile body concrete label is not lower than C80.
The prefabricated filling core 2 is 2m in concrete height, 880mm in diameter and the steel supporting plate 9 is a round steel plate with 1200mm in diameter and 20mm in thickness. Referring to fig. 9, a groove for installing a rubber grout stop ring 11 is formed in the bottom of the prefabricated filling core 2, the groove is 2cm wide and 2cm deep, and the distance from the bottom surface of the prefabricated filling core 2 is 3.2cm.
Referring to fig. 5, 6 and 8, the prefabricated filling core 2 is provided with reserved connecting steel bars 5, when the prefabricated filling core 2 is manufactured, longitudinal steel bars and stirrups are firstly bound into a steel bar cage, the longitudinal steel bars are 10 phi 20mm steel bars of HRB400, the stirrups are steel bars with phi 8mm of HRB400, the longitudinal steel bars are arranged in a circular shape with the diameter of 700mm, and the distance between the stirrups is 150mm. The steel supporting plate 9 is made of Q235 steel, a grouting hole 12 and a grouting hole 13 are symmetrically arranged around the center of the steel supporting plate 9, and the center distance between the two holes is 890mm. And (3) placing the steel supporting plate 9 on a flat ground as a bottom die in an inverted pouring mode, welding the longitudinal ribs on the reinforcement cage and the steel supporting plate 9 into a whole, and sleeving a template to pour concrete to finish prefabrication of the prefabricated filling core 2. After maintaining to form strength, removing the die, adjusting the prefabricated filling core 2 to enable the steel supporting plate 9 to face upwards, welding 10 phi 20mm connecting steel bars 5 of HRB400 on the steel supporting plate 9, wherein the length of the connecting steel bars 5 is L1, and the positions of the connecting steel bars 5 correspond to the positions of the pre-buried metal corrugated pipes 4.
The cross section of the rubber grout stop ring 11 is in a trapezoid and rectangle combined shape, the length of each side of the rectangle is 2cm, the long side of the trapezoid is 1.5cm, the short side of the trapezoid is 0.75cm, the height of the trapezoid is 3cm, the inner diameter of the rubber grout stop ring 11 is 840mm, the rectangular part in the ring body is matched with a groove at the bottom of the prefabricated filling core 2, and the structural detail is shown in a matched figure 9. The bottom of the prefabricated filling core 2 is provided with a groove for installing the rubber grout stop ring 11, the cross section of the groove is rectangular, the width and the depth of the groove are identical to those of the rectangular part in the cross section of the rubber grout stop ring 11, the rectangular part in the cross section of the rubber grout stop ring 11 is embedded into the 1 groove when being installed, the longer bottom edge of the right trapezoid part faces towards one side close to the steel supporting plate 9, the shorter bottom edge faces away from one side of the steel supporting plate 9, and when the rubber grout stop ring 11 is installed on the prefabricated filling core, a right trapezoid protruding part is formed, so that tightness is guaranteed, the protruding height of the right trapezoid protruding part is slightly larger than an assembly gap 20, and the trapezoid protruding part reduces friction resistance to facilitate placement of the prefabricated filling core 2.
A construction method of a rapid high-strength connection structure of a prefabricated pipe pile and a capping beam with prefabricated filling cores comprises the following steps:
when the prefabricated cover beam is used, the construction of the prefabricated cover beam 1, the prefabricated filling core 2 and the prefabricated pipe pile 3 is finished in a factory, the prefabricated cover beam 1 and the prefabricated filling core 2 are required to be manufactured according to reinforcement requirements, and the rubber grout stop ring 11 is also finished in the factory.
After the prefabricated pipe pile 3 is transported to a construction site, firstly, the prefabricated filling core 2 sleeved with the rubber grout stop ring 11 is placed into a pipe pile opening 18, an assembly gap 20 of 1cm is reserved between the prefabricated filling core 2 and the pipe pile end plate 19 of the prefabricated pipe pile 3, the positions of connecting steel bars 5 are adjusted to correspond to the positions of the embedded metal corrugated pipes 4, the steel supporting plate 9 and the pipe pile end plate 19 are fixed and welded into a whole through pile top hoops 10, the grouting holes 12 on the steel supporting plate 9 at the top of the prefabricated filling core 2 are filled with UTFC 6 to fill the assembly gap 20 between the prefabricated filling core 2 and the prefabricated pipe pile 3 until the UTFC 6 overflows from the grout outlet 13, and the assembly gap grouting connection of the prefabricated filling core 2 and the prefabricated pipe pile 3 is completed.
A leveling mortar layer 7 with the thickness of 3cm is arranged on a steel supporting plate 9 at the top of a prefabricated filling core 2, then a prefabricated capping beam 1 is arranged above the prefabricated filling core 2, and a connecting steel bar 5 corresponds to the pre-buried metal corrugated pipe 4 and penetrates into the corrugated pipe. And (3) injecting UTFC 6 into the holes of the pre-buried metal corrugated pipe 4 from the top after the placement and adjustment of the prefabricated capping beam 1 are finished, vibrating compactly, and finishing the connection of the prefabricated capping beam 1 and the prefabricated pipe pile 3.
In the grouting mode, the length L1 of the reserved connection steel bar 5 should satisfy the following formula:
wherein: l (L) 1 : the anchoring length (mm) of the connecting steel bars in the UTFC grouting material;
c 1 : the value is 0.104;
c 2 : the relative dimensional coefficient of the two-dimensional shape,
D b is the diameter (mm) of the steel bar, D d Is the diameter (mm) of the corrugated pipe;
f u : ultimate strength (MPa) of the joint rebar;
f UTFC : UTFC concrete 150mm cube standard test piece 28d compressive strength (MPa).
Height L of prefabricated filling core 2 2 The following formula should be satisfied:
L 2 ＝1.5D p +0.05l
wherein: l (L) 2 : the length (m) of the prefabricated filling core in the prefabricated pipe pile;
D p : prefabricating the outer diameter (m) of the tubular pile;
l: and calculating the height (m) of the precast tubular pile, wherein when the precast tubular pile is not exposed out of the ground surface, the value of l is 4, and when the precast tubular pile is used as a pile integrated pier, the value of l is calculated according to the actual pier height.
In addition, the UTFC related to the utility model is Ultra-high ToughnessFiberConcrete, UTFC, which is a special name in the field, and generally refers to a compact reinforced composite material with ultrahigh strength, high ductility, high workability and durability.
Claims (7)
1. The rapid high-strength connecting structure of the prefabricated pipe pile and the capping beam with the prefabricated filling core is characterized by comprising the prefabricated capping beam (1), the prefabricated pipe pile (3) and the prefabricated filling core (2);
a metal corrugated pipe (4) is pre-buried in the prefabricated bent cap (1);
the prefabricated pipe pile (3) is provided with a pipe pile opening (18) and a pipe pile end plate (19);
reserved connection steel bars (5) are arranged in the prefabricated filling cores (2); a steel supporting plate (9) is arranged at the top of the prefabricated filling core (2), and the reserved connecting steel bars (5) and the steel supporting plate (9) are welded into a whole;
the prefabricated filling core (2) is placed in a pipe pile opening (18) of the prefabricated pipe pile (3), and an assembly gap (20) between the prefabricated filling core (2) and the prefabricated pipe pile (3) is connected by grouting;
the prefabricated cover beam (1) is arranged on the prefabricated filling core (2), the number and the positions of the metal corrugated pipes (4) and the reserved connecting steel bars (5) are corresponding, and the metal corrugated pipes and the reserved connecting steel bars are in butt joint and are connected with the prefabricated filling core (2) in a grouting mode.
2. The rapid high-strength connecting structure for the prefabricated pipe pile and the bent cap with the prefabricated filling cores according to claim 1, wherein rubber grout stop rings (11) are arranged in grooves formed in the bottoms of the prefabricated filling cores (2), and the sections of the rubber grout stop rings (11) are trapezoid and rectangular combined shapes.
3. The rapid high-strength connection structure of prefabricated pipe piles and capping beams with prefabricated filling cores according to claim 1, wherein the grouting materials and the grouting materials are super-tough fiber concrete UTFC.
4. The rapid high-strength connection structure of the prefabricated pipe pile with the prefabricated filling core and the capping beam according to claim 1, wherein the steel supporting plate (9) is round, the diameter of the steel supporting plate is the same as the outer diameter of the prefabricated pipe pile (3), and a grouting hole (12) and a grouting hole (13) are symmetrically formed in the steel supporting plate (9).
5. The rapid high-strength connection structure of prefabricated pipe piles and capping beams with prefabricated filling cores according to claim 1, wherein the length L1 of the reserved connection reinforcing steel bars (5) should satisfy the following formula:
wherein: l (L) 1 : the anchoring length (mm) of the connecting steel bars in the UTFC grouting material;
c 1 : the value is 0.104;
c 2 : the relative dimensional coefficient of the two-dimensional shape,
D b is the diameter (mm) of the steel bar, D d Is the diameter (mm) of the corrugated pipe;
f u : ultimate strength (MPa) of the joint rebar;
f UTFC : UTFC concrete 150mm cube standard test piece 28d compressive strength (MPa).
6. The rapid high-strength connection structure of prefabricated pipe pile and capping beam with prefabricated filling core according to claim 1, wherein the height L of the prefabricated filling core (2) is as follows 2 The following formula should be satisfied:
L 2 ＝1.5D p +0.05l
wherein: l (L) 2 : the length (m) of the prefabricated filling core in the prefabricated pipe pile;
D p : prefabricating the outer diameter (m) of the tubular pile;
l: and calculating the height (m) of the precast tubular pile, wherein when the precast tubular pile is not exposed out of the ground surface, the value of l is 4, and when the precast tubular pile is used as a pile integrated pier, the value of l is calculated according to the actual pier height.
7. The rapid high-strength connection structure of prefabricated pipe piles and bent caps with prefabricated filling cores according to claim 1, wherein the prefabricated pipe piles (3) are high-strength concrete pipe piles with pile body concrete strength grades of C80 and above or high-strength concrete pipe piles with main reinforcement in the form of prestressed steel bars and common steel bars in a combined configuration.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223360356.5U CN219032904U (en) | 2022-12-14 | 2022-12-14 | Quick high-strength connection structure of prefabricated pipe pile and bent cap with prefabricated filling core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223360356.5U CN219032904U (en) | 2022-12-14 | 2022-12-14 | Quick high-strength connection structure of prefabricated pipe pile and bent cap with prefabricated filling core |
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| CN219032904U true CN219032904U (en) | 2023-05-16 |
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