A steel bar structure for pier beam anchoring, anchoring node structure and construction method

Abstract

The present invention relates to a steel bar structure for anchoring piers and beams, an anchoring node structure and a construction method, comprising a first circular ring and a second circular ring arranged coaxially, a plurality of vertical steel bars arranged in an annular direction are arranged between the first circular ring and the second circular ring, the ends of the vertical steel bars extending above the first circular ring and the ends extending below the second circular ring are both provided with bending parts facing the same direction, an elastic member is provided between the vertical steel bars and the first circular ring and / or the second circular ring, a limiting member is elastically provided on the first circular ring, a limiting groove of the limiting member cooperates with the bending part so that the bending part maintains a state of facing the center of the first circular ring; the limiting member can disengage the limiting groove from the bending part under the action of a cap beam, so that the bending part rotates to the outer side of the first circular ring and the second circular ring under the action of the elastic member. The steel bar structure and the node structure of the present invention have reliable force, convenient construction and strong applicability.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and in particular to a steel bar structure for anchoring piers and beams, an anchoring node and a construction method. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Prefabrication and assembly is the main trend in the development of civil engineering and is also the direction of vigorous development in the field of bridge engineering. Prefabricated assembled bridges have more advantages than traditional cast-in-place concrete bridges. For example, the project structure has high quality, less wet work on site, fast construction speed, less interference with the surrounding environment, and green environmental protection.

[0004] The connection node between the pier and the cap beam needs to transfer the load of the upper structure of the bridge to the lower structure. The force is relatively complex. It is one of the key structures that distinguish the prefabricated bridge structure from the traditional cast-in-place structure, and it is also an important link in prefabricated assembly construction.

[0005] At present, the commonly used connection method between pier and cap beam in prefabricated assembly technology is grouting corrugated pipe and grouting sleeve connection. It is necessary to arrange a large number of extended steel bars on the outer edge of the pier section and reserve corresponding holes on the cap beam. The requirements for component manufacturing and assembly accuracy are high, and the construction is difficult. More importantly, there is no steel bar passing through the inner area of ​​the connection node, which affects the overall force performance of the node. Patent application CN110804944A discloses a bridge pier-cap beam node pouring connection method and structure suitable for earthquake-severe areas. The outer side of the pier is connected by partial grouting corrugated pipe, and the inner side of the pier is connected by vertical steel bars extending into the reserved slot of the cap beam and pouring concrete to achieve the fixation between the pier and the cap beam. In the above technical scheme, the steel cage between the cap beam and the pier is a cylindrical curved surface structure. The steel cage with a cylindrical curved surface structure has a limited contact range with the concrete, and the anchoring performance is poor, which reduces the overall force transmission performance of the node. In addition, a large number of oblique steel bars need to be welded between the lower part of the steel cage and the longitudinal bars of the pier, which is complex in structure, long in construction period, and labor-intensive. Summary of the invention

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a steel bar structure for pier-beam anchoring, which can be matched with bamboo-shaped reserved holes and poured with concrete, thereby improving the anchoring performance and the stress on the nodes, while facilitating construction and shortening the construction period.

[0007] To achieve the above object, the present invention adopts the following technical solution:

[0008] In a first aspect, an embodiment of the present invention provides a steel bar structure for anchoring a pier and a beam, comprising a first circular ring and a second circular ring arranged coaxially, a plurality of vertical steel bars arranged in a circumferential direction are arranged between the first circular ring and the second circular ring, the ends of the vertical steel bars extending above the first circular ring and the ends extending below the second circular ring are both provided with bending portions facing the same direction, an elastic member is provided between the vertical steel bars and the first circular ring and / or the second circular ring, a limiting member is elastically provided on the first circular ring, and a limiting groove of the limiting member cooperates with the bending portion to keep the bending portion facing the center of the first circular ring;

[0009] The limiting member can disengage the limiting groove from the bending portion under the action of the cap beam, so that the bending portion can rotate to the outer direction of the first ring and the second ring under the action of the elastic member.

[0010] Optionally, the inner ring surfaces of the first and second rings are both provided with connecting seats, the vertical steel bars pass through the connecting seats along the axial direction of the first and second rings and an elastic member is provided between the connecting seats, the limiting member is provided on the inner side of the vertical steel bars, and the limiting member is elastically connected to the connecting seat.

[0011] Optionally, the limiting member adopts a U-shaped structure, including a first limiting portion and a second limiting portion and a third limiting portion respectively arranged on both sides of the first limiting portion, and a limiting groove is formed between the second limiting portion and the third limiting portion, wherein the length of the second limiting portion is smaller than the length of the third limiting portion.

[0012] Optionally, the elastic member is a spring or a torsion spring.

[0013] Optionally, the first circular ring is provided with a blocking member capable of contacting the bending portion to limit the rotation angle of the vertical steel bar under the action of the elastic member.

[0014] Optionally, a plurality of skeleton steel bars distributed along the annular direction are arranged between the first circular ring and the second circular ring, and the skeleton steel bars are provided with pads.

[0015] Optionally, the bottom surface of the second ring is provided with supporting feet.

[0016] In the second aspect, an embodiment of the present invention provides a pier-beam anchoring node structure, including a pier column and a cap beam, a concrete structure is provided at the connection position of the pier column and the cap beam, the concrete structure includes a first concrete part and a second concrete part and a third concrete part located at both ends of the first concrete part, the outer diameters of the second concrete part and the third concrete part are larger than the outer diameter of the first concrete part, the second concrete part is located in the cap beam, and the third concrete part is located in the pier column, the concrete structure is provided with the steel bar structure for anchoring the pier and beam described in the first aspect, and the bent parts at both ends of the vertical steel bars are respectively located in the second concrete part and the third concrete part.

[0017] Optionally, a plurality of prestressed tendons located on the periphery of the concrete structure are provided between the cap beam and the pier, and the prestressed tendons are anchored to the top surface of the cap beam through anchors, or a plurality of grouting bellows or grouting sleeves located on the periphery of the concrete structure are provided between the cap beam and the pier.

[0018] In a third aspect, an embodiment of the present invention provides a construction method for a pier-beam anchor node, comprising the following steps:

[0019] The prefabricated bridge pier with a first hole on the top is hoisted into place, wherein the first hole includes a first hole portion with a larger diameter and a second hole portion with a smaller diameter, and the top end of the second hole portion extends to the top surface of the prefabricated bridge pier;

[0020] The prefabricated steel bar structure for anchoring the pier and beam according to the first aspect is placed on the top of the prefabricated bridge pier through the first hole, wherein the bent portion of the vertical steel bar located below the second circular ring is located in the first hole;

[0021] The cap beam with a second hole on the bottom surface is hoisted into place, the second hole is connected with the first hole, the second hole includes a third hole portion with a larger diameter and a fourth hole portion with a smaller diameter, the bottom end of the third hole portion extends to the bottom surface of the cap beam, the bent portion above the first circular ring is located in the third hole portion, under the pressure of the cap beam, the bent portion above the first circular ring is separated from the limiting groove, and under the action of the elastic member, the bent portions on both sides of the vertical steel bar are rotated to face the outside of the first circular ring and the second circular ring;

[0022] Concrete is poured into the first hole and the second hole through a pouring port on the cap beam that is connected to the second hole.

[0023] Beneficial effects of the present invention:

[0024] 1. In the steel bar structure of the present invention, both ends of the vertical steel bars are provided with bending parts. During construction, after the bending parts are separated from the limiting parts, they can be expanded outwards under the action of the elastic parts to form bamboo-shaped structures with large areas at both ends. Then, the poured concrete used in conjunction with the bending parts is also a bamboo-shaped structure. Compared with the traditional cylindrical steel cage structure, the anchoring performance of the steel bar structure is greatly improved, and the force transmission performance is good. Moreover, during construction, the bending parts can be separated from the limiting grooves through the movement of the limiting parts under the action of the cap beam, and automatically expanded, which is simple to operate and convenient to construct.

[0025] 2. The node structure of the present invention forms the bridge pier and the cap beam into a whole by internally installing a steel bar structure and pouring concrete, and the outer side of the pier column is provided with prestressed tendons or grouting bellows or grouting sleeves for reinforcement, so that the force integrity of the connection node is good and the reliability is high; secondly, the prestressed tendons or grouting bellows or grouting sleeves and holes arranged between the pier column and the cap beam can assist in positioning, thereby improving the assembly accuracy without significantly increasing the difficulty of construction.

[0026] 3. The construction method of the node structure of the present invention is that the steel bar structure is prefabricated and can be directly hoisted when in use without the need to tie up the steel bar cage on site, which greatly shortens the construction period and reduces the labor intensity of the construction workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation on the present application.

[0028] Figure 1 This is a schematic diagram of the overall structure of the folded state of Example 1 of the present invention;

[0029] Figure 2 This is a front view of the overall structure of the folded state of Example 1 of the present invention;

[0030] Figure 3 This is a top view of the overall structure of embodiment 1 of the present invention in a folded state;

[0031] Figure 4 This is a bottom view of the overall structure of embodiment 1 of the present invention in a folded state;

[0032] Figure 5 This is a schematic diagram of the overall structure of the expanded state of Example 1 of the present invention;

[0033] Figure 6 This is a front view of the overall structure of the embodiment 1 of the present invention in the unfolded state;

[0034] Figure 7 This is a top view of the overall structure of the embodiment 1 of the present invention in the unfolded state;

[0035] Figure 8 This is a bottom view of the overall structure of the embodiment 1 of the present invention in the unfolded state;

[0036] Fig. 9 It is a partial top view of the first connecting seat in the folded state of embodiment 1 of the present invention;

[0037] Fig.10 It is a partial front view of the first connecting seat in the folded state of embodiment 1 of the present invention;

[0038] Fig.11 For the present invention Figure 7 and Figure 8 Schematic diagram of the cross section in the A direction;

[0039] Fig.12 For the present invention Figure 7 and Figure 8 Schematic diagram of the cross section in the B direction;

[0040] Fig.13 It is a partial top view of the first connecting seat in the unfolded state of Example 1 of the present invention;

[0041] Fig.14 This is a partial front view of the first connecting seat in the unfolded state of Example 1 of the present invention;

[0042] Fig.15 This is a front view of the overall structure of Example 2 of the present invention;

[0043] Fig.16 For the present invention Fig.13 Schematic diagram of the X-section in FIG.

[0044] Among them, 1. pier column, 2. cap beam, 3. steel bar structure for pier beam anchoring, 4. epoxy resin layer, 5. pouring nozzle, 6. prestressed tendons, 7. steel bar hole, 8. anchor;

[0045] 31. C-shaped steel bar structure, 32. first circular ring, 33. second circular ring, 34. skeleton steel bar, 35. concrete pad, 36. first connecting seat, 37. second connecting seat, 361. elastic member, 362. spring, 363. limiting member, 364. blocking member. DETAILED DESCRIPTION

[0046] In the present embodiment, the "bamboo-joint shape" refers to a structural shape in which the cross-sectional area of ​​the two end portions is larger than the cross-sectional area of ​​the middle portion.

[0047] Example 1

[0048] This embodiment provides a steel bar structure for pier-beam anchoring, such as Figure 1-Figure 14 As shown, it includes a first circular ring 32 and a second circular ring 33 which are coaxially arranged. When in use, the first circular ring 32 is located above the second circular ring 33. The first circular ring 32 is used to be arranged inside the cap beam 2, and the second circular ring 33 is used to be arranged inside the pier 1.

[0049] The inner ring surfaces of the first ring and the second ring are both provided with connecting seats. The inner ring surface of the first ring 32 is provided with a plurality of first connecting seats 36, and the plurality of first connecting seats 36 are arranged at equal intervals along the circumferential direction. The inner ring surface of the second ring 33 is provided with a plurality of second connecting seats 37 matching the first connecting seats 36, and the plurality of second connecting seats 37 are arranged at equal intervals along the circumferential direction.

[0050] A vertical steel bar passes through the corresponding first connecting seat 36 and the second connecting seat 37, and the axis of the vertical steel bar is parallel to the axis of the first circular ring and the second circular ring.

[0051] The top end of the vertical steel bar extends above the first connection seat and is provided with a first 90° bend, the bottom end of the vertical steel bar extends below the second connection seat and is provided with a second 90° bend, the first bend and the second bend have the same bending direction, and together with the vertical steel bar, they form a C-shaped steel bar structure 31. The size and structural arrangement of the formed C-shaped steel bar structure 31 are calculated and determined according to existing specifications.

[0052] The vertical steel bar is rotatably connected to the first connecting seat and the second connecting seat. The vertical steel bar can rotate around its own axis. An elastic member is provided between the vertical steel bar and the first connecting seat and / or the second connecting seat. In this embodiment, an elastic member 361 is provided between the vertical steel bar and the first connecting seat. The elastic member 361 adopts an existing torsion spring or a spring. The elastic member 361 can drive the vertical steel bar to rotate around its own axis, so that the bending parts at both ends of the vertical steel bar rotate to a posture facing the outer side of the first ring 32 and the second ring 33.

[0053] A limiting member 363 is disposed on the inner side of the first connecting seat. The limiting member 363 is provided with a limiting groove. The limiting groove cooperates with the first bending portion to enable the first bending portion and the second bending portion to maintain a posture toward the center of the first ring 32 and the second ring 33.

[0054] The limit member 363 is elastically connected to the first connecting seat and can move along the axial direction of the first ring 32 and the second ring 33. In this embodiment, the first connecting seat is provided with a groove at the inner side of the vertical steel bar, and the limit member 363 is slidably connected in the groove. The limit member is connected to the top end of the spring 362, and the bottom end of the spring 362 is connected to the bottom groove surface of the groove.

[0055] In this embodiment, the limiting member 363 adopts a U-shaped structure, including a first limiting portion and a second limiting portion arranged at one end of the first limiting portion, and a third limiting portion arranged at the other end of the first limiting portion, wherein the first limiting portion is connected to the top end of the spring, and the length of the second limiting portion is less than the length of the third limiting portion.

[0056] The second limiting portion and the third limiting portion form a limiting groove. In the initial state, the first bent portion of the vertical steel bar extends into the limiting groove between the second limiting portion and the third limiting portion. Under the limiting action of the second limiting portion and the third limiting portion, the vertical steel bar cannot be rotated using the elastic part.

[0057] When the limiting member 363 moves downward under the action of external force, causing the first bending portion to disengage from the second limiting portion, that is, disengage from the limiting groove, the limiting member cannot stop the rotation of the vertical steel bar. The vertical steel bar rotates around its own axis under the action of the elastic member, so that the first bending portion and the second bending portion can rotate toward the outside of the first ring and the second ring.

[0058] A blocking member 364 is also provided on the upper end surface of the first circular ring. The blocking member 364 adopts a blocking rod. The first bent portion can be rotated until it contacts the blocking rod, and its further rotation is restricted by a blocking plate. The blocking rod is set in a position that allows the first bent portion to rotate 180°, that is, after the first bent portion contacts the blocking rod, the first bent portion is set radially outwardly along the first circular ring and the second circular ring.

[0059] By adopting this setting method, the entire steel bar structure can form a bamboo-shaped structure with large areas at both ends and a small area in the middle. The corresponding concrete structure is also a bamboo-shaped structure. Compared with the traditional cylindrical steel bar structure, the contact area between the end of the steel bar structure and the concrete is larger, and the force transmission performance is better, which greatly improves the anchoring performance and greatly reduces the length of the anchoring steel bar, which is especially suitable for cap beams with smaller heights.

[0060] By setting the blocking rod, it can be ensured that the potential energy of the elastic member cannot be fully released, so as to ensure that the steel bar structure is fully unfolded.

[0061] In order to support the steel structure, the first circular ring 32 and the second circular ring 33 are provided with a plurality of skeleton steel bars 34, the axes of the skeleton steel bars 34 are parallel to the axes of the first circular ring 32 and the second circular ring 33, and the plurality of skeleton steel bars 34 are arranged at equal intervals along the circumferential direction, and the connection position with the first circular ring 32 is located between two adjacent first connecting seats, and the connection position with the second circular ring 33 is located between two adjacent second connecting seats.

[0062] At least one pad is provided on the skeleton reinforcement, and the pad is used to limit the minimum distance between the reinforcement structure and the hole wall and to assist in positioning the reinforcement structure in the hole. In this embodiment, the pad is a circular concrete pad 35 .

[0063] A plurality of legs 38 are provided on the bottom end surface of the second circular ring 32 to ensure a minimum distance between the steel bar structure and the bottom end surface when the steel bar structure is placed in the hole of the pier column, and to reserve a space for the expansion of the bent portion of the vertical steel bar.

[0064] In this embodiment, the length of the supporting legs is 5 cm-10 cm, and those skilled in the art can set it according to actual needs.

[0065] Example 2

[0066] This embodiment provides a pier-beam anchoring node structure, such as Figure 15-16 As shown, it includes a pier 1 and a cap beam 2 above the pier 1, bamboo-shaped holes are provided at the connection position of the pier and the cap beam, a concrete structure is provided inside the hole, and the steel bar structure 3 for anchoring the pier and beam described in Example 1 is embedded inside the concrete structure.

[0067] Specifically, the top surface of the pier 1 is provided with a first hole, which includes a first hole portion and a second hole portion which are coaxially arranged, the diameter of the first hole portion is larger than the diameter of the second hole portion, one end of the second hole portion is connected to the first hole portion, and the other end extends to the top surface of the pier.

[0068] A second hole is provided on the bottom surface of the cap beam 2, and the second hole includes a third hole portion and a fourth hole portion which are coaxially arranged. The diameter of the third hole portion is larger than the diameter of the fourth hole portion. One end of the fourth hole portion is connected to the third hole portion, and the other end extends to the top surface of the cap beam. After the cap beam is combined with the pier, the fourth hole portion is coaxially connected to the second hole portion, so that the first hole and the second hole together constitute a bamboo-shaped structure.

[0069] A concrete structure is arranged in the hole, so that the concrete structure includes a first concrete part, a second concrete part located on the top of the first concrete part, and a third concrete part located at the bottom of the first concrete part, the second concrete part is filled in the first hole part, and the third concrete part is filled in the third hole part.

[0070] In this embodiment, the concrete is made of high-performance materials, such as ultra-high performance concrete (UHPC).

[0071] The concrete structure is provided with the steel bar structure described in Example 1, wherein the first bent portion is located in the second concrete portion and faces outward in the radial direction of the first and second circular rings, and the second bent portion is located in the third concrete portion and faces outward in the radial direction of the first and second circular rings.

[0072] An epoxy resin layer 4 or a mortar cushion is also provided between the top surface of the pier column 1 and the bottom surface of the cap beam. The joint surface between the top surface of the pier column 1 and the bottom surface of the cap beam 2 is roughened to increase the contact area between the epoxy resin layer 4 or the mortar cushion and the concrete of the pier column 1 and the cap beam 2.

[0073] A plurality of prestressed tendons 6 are also provided between the pier column 1 and the cap beam 2. The plurality of prestressed tendons are located at the periphery of the concrete structure, a portion of the prestressed tendons 6 is located inside the pier column 1, and the top of the prestressed tendons 6 is anchored to the top surface of the cap beam by means of anchors 8. The anchors 8 are located in the anchoring grooves provided on the top surface of the cap beam 2 and are used to tension the prestressed tendons 6. In this embodiment, the tensioning of the prestressed tendons 6 adopts the existing non-bonding method.

[0074] In some other embodiments, a grouting bellows and a post-grouting sleeve may be used instead of the prestressed tendons.

[0075] With this arrangement, the pier and the cap beam are formed into a whole through the bamboo-shaped concrete structure, and prestressed tendons are provided on the outside of the pier to strengthen it. The force integrity of the connection node is good and the reliability is high. Secondly, the prestressed tendons or grouting bellows or grouting sleeves and holes provided between the pier and the cap beam can assist in positioning, thereby improving the assembly accuracy without significantly increasing the difficulty of construction.

[0076] This connection node is not only suitable for the connection between piers and cap beams, but also for the connection between other prefabricated parts, such as piers and abutments.

[0077] Example 3

[0078] This embodiment provides a construction method for the pier-beam anchor node structure described in Embodiment 2, comprising the following steps:

[0079] Step 1: Process the steel bar structure described in Example 1 according to the design drawings, and rotate the vertical steel bars in advance so that the first bent portion is inserted into the limiting groove of the limiting member.

[0080] The pier column 1 and the cap beam 2 are prefabricated, and a first hole is set on the top surface of the pier column 1, and a second hole is set on the bottom surface of the cap beam 2. Specifically, after the reinforcement of the pier column 1 and the cap beam 2 is tied, a flexible inflatable formwork is used to reserve a first hole on the top surface of the pier column and a second hole on the bottom surface of the cap beam, and then the concrete of the pier column and the cap beam is poured. After the concrete hardens, the flexible inflatable formwork is deflated and taken out, forming a first hole on the top surface of the pier column and a second hole on the bottom surface of the cap beam.

[0081] The interface between the contact end of the pier 1 and the cap beam 2 is roughened by the existing method, which will not be described in detail here. The steel bars protruding from the top of the pier are treated with anti-corrosion.

[0082] Step 2: transport the pier 1 and the cap beam 2 to the construction site, lay an epoxy resin layer 4 or a mortar cushion layer on the upper end surface of the pier 1, and hoist the prefabricated pier 1 into place.

[0083] Step 3: After the prefabricated pier 1 is hoisted into place, the prefabricated steel bar structure of Example 1 is placed in the first hole of the prefabricated pier, and the support leg 38 contacts the bottom surface of the first hole. The concrete pads on the skeleton steel bars ensure the distance between the steel bar structure and the wall of the first hole, meet the thickness of the concrete protective layer, and assist in the positioning of the prefabricated pier and the steel bar structure to ensure installation accuracy.

[0084] Step 4: Hoist the cap beam so that the prestressed tendons reserved on the top of the prefabricated pier column are aligned with the steel bar holes 7 reserved in the cap beam to ensure the installation accuracy of the pier column 1 and the cap beam 2. Then slowly lower the cap beam 2. When the top surface of the second hole in the cap beam 2 contacts the top of the limiter 363, the limiter 363 is driven to move downward. When the first bend part is separated from the second limiter part, the vertical steel bar rotates under the action of the elastic part, and the first bend part rotates to contact the blocking rod. At this time, the first bend part is located in the first hole part of the first hole, and the second bend part is located in the third hole part of the second hole. The steel bar structure changes from a retracted state to an expanded state.

[0085] Step 5: After the cap beam 2 is hoisted into place, the prestressed tendons 6 are tensioned and anchored with anchors. A pouring port 5 connected to the second hole is opened on the top surface of the cap beam 2 to pour concrete into the bamboo-shaped space formed by the first hole and the second hole for filling.

[0086] The poured concrete is ultra-high performance concrete (UHPC).

[0087] The node structure and construction method of this embodiment are simple to operate on the construction site and have high assembly accuracy. Compared with the conventional pier-cap beam connection node construction, the on-site binding process of the steel cage is omitted, the construction quality is increased, and the construction period is shortened.

[0088] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A steel bar structure for pier and beam anchoring, It is characterized in that It comprises a first circular ring and a second circular ring arranged coaxially, a plurality of vertical steel bars arranged in the annular direction are arranged between the first circular ring and the second circular ring, the ends of the vertical steel bars extending above the first circular ring and the ends extending below the second circular ring are both provided with bent portions facing the same direction, an elastic member is provided between the vertical steel bars and the first circular ring and / or the second circular ring, a limiting member is elastically provided on the first circular ring, and a limiting groove of the limiting member cooperates with the bent portion to keep the bent portion facing the center of the first circular ring; The limiting member can make the limiting groove and the bending part disengage under the action of the cap beam, so that the bending part can rotate to the outer direction of the first ring and the second ring under the action of the elastic member; The inner ring surfaces of the first and second rings are both provided with connecting seats, the vertical steel bars pass through the connecting seats along the axis direction of the first and second rings, and an elastic member is provided between the connecting seats, the limiting member is provided inside the vertical steel bars, and the limiting member is elastically connected to the connecting seat; The limiting member adopts a U-shaped structure, including a first limiting portion and a second limiting portion and a third limiting portion respectively arranged on both sides of the first limiting portion, a limiting groove is formed between the second limiting portion and the third limiting portion, wherein the length of the second limiting portion is smaller than the length of the third limiting portion.

2. A steel bar structure for pier-beam anchoring as claimed in claim 1, It is characterized in that The elastic member is a spring or a torsion spring.

3. A steel bar structure for pier-beam anchoring as claimed in claim 1, It is characterized in that The first circular ring is provided with a blocking member capable of contacting the bent portion to limit the rotation angle of the vertical steel bar under the action of the elastic member.

4. A steel bar structure for pier-beam anchoring as claimed in claim 1, It is characterized in that A plurality of skeleton steel bars distributed along the annular direction are further arranged between the first circular ring and the second circular ring, and the skeleton steel bars are provided with pads.

5. A steel bar structure for pier-beam anchoring as claimed in claim 1, It is characterized in that The bottom surface of the second ring is provided with supporting feet.

6. A pier-beam anchoring node structure, comprising a pier column and a cap beam, It is characterized in that A concrete structure is provided at the connection position between the pier and the cap beam, the concrete structure includes a first concrete part and a second concrete part and a third concrete part located at both ends of the first concrete part, the outer diameters of the second concrete part and the third concrete part are larger than the outer diameter of the first concrete part, the second concrete part is located in the cap beam, the third concrete part is located in the pier, and the concrete structure is provided with a steel bar structure for anchoring the pier and beam as described in any one of claims 1 to 5, and the bent parts at both ends of the vertical steel bars are respectively located in the second concrete part and the third concrete part.

7. A pier-beam anchoring node structure as claimed in claim 6, It is characterized in that A plurality of prestressed tendons located on the periphery of the concrete structure are arranged between the cap beam and the pier column, and the prestressed tendons are anchored to the top surface of the cap beam through anchors, or a plurality of grouting bellows or grouting sleeves located on the periphery of the concrete structure are arranged between the cap beam and the pier column.

8. A construction method for the pier-beam anchor node according to claim 7, It is characterized in that The following steps are involved: A prefabricated pier column with a first hole on the top surface is hoisted into place, wherein the first hole includes a first hole portion and a second hole portion which are coaxially arranged, the diameter of the first hole portion is larger than the diameter of the second hole portion, one end of the second hole portion is connected to the first hole portion, and the other end extends to the top surface of the pier column; The steel bar structure for anchoring the pier beam is placed at the top of the prefabricated pier column through the first hole, wherein the bent portion of the vertical steel bar below the second circular ring is located in the first hole; The cap beam with a second hole on the bottom surface is hoisted into place, the second hole is connected with the first hole, the second hole includes a third hole portion and a fourth hole portion which are coaxially arranged, the diameter of the third hole portion is larger than the diameter of the fourth hole portion, one end of the fourth hole portion is connected with the third hole portion, and the other end extends to the bottom surface of the cap beam, the bent portion above the first circular ring is located in the third hole portion, under the pressure of the cap beam, the bent portion above the first circular ring is separated from the limiting groove, and under the action of the elastic member, the bent portions on both sides of the vertical steel bar are rotated to face the outside of the first circular ring and the second circular ring; Concrete is poured into the first hole and the second hole through a pouring port on the cap beam that is connected to the second hole.

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