A fabricated bent cap and a construction method thereof

Abstract

The application relates to the field of bridge construction, and particularly discloses a fabricated bent cap and a construction method thereof, which comprises a bent cap body and a pier column, the bent cap body is arranged above the pier column, a reserved groove is arranged in the middle of the top end of the bent cap body, the reserved groove is in a rectangular shape, and a plurality of metal bellows are embedded in the inside of the bent cap body and below the reserved groove; in the application, the boss groove and the positioning assembly are used for guiding and positioning during hoisting, so that the precision of hoisting and splicing is improved; after hoisting is completed, the conical boss and the boss groove are matched, the bent cap is matched with the receiving groove, the first flow channel and the second flow channel form a circular cavity and are connected with the pouring hole, the pouring convenience is ensured, the firmness between the bent cap body and the pier column is ensured, the steel bars are inserted into the metal bellows after the bent cap body and the pier column are spliced, and UHPC concrete is poured into the metal bellows, so that the splicing efficiency is improved, and the steel bars are prevented from being damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge construction, and in particular to a fabricated bent cap and a construction method thereof. BACKGROUND

[0002] The bent cap refers to supporting, distributing and transferring the load of the superstructure, and the construction of the bent cap is high-altitude operation, and a large amount of concrete is cast in place, which has high construction risk; with the further promotion of bridge industrialization, the traditional construction method of pouring all in the field is gradually changed into the construction method of precasting part or most of the components in the factory and then transporting them to the site for installation, compared with the traditional construction method, the industrialized production method first solves the connection between the precast components. In the process of bridge industrialization, the superstructure is earlier than the substructure, and the current bridge industrialization mainly refers to the industrialization of the substructure, that is, the bent cap, the pier and the bent cap, and the precast bent cap is mainly connected with the pier in the form of assembly; however, during the assembly operation of the bent cap and the pier, the bent cap needs to be accurately assembled and connected with the preembedded steel bars at the top of the pier, and since a large number of steel bars are preembedded in the pier according to the design, the assembly process of the bent cap and the pier is relatively long, and slight errors will cause damage to the steel bars and reduce the assembly efficiency.

[0003] Therefore, the present application provides a fabricated bent cap and a construction method thereof to solve the above problems. SUMMARY

[0004] The present application aims to provide a fabricated bent cap and a construction method thereof to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] A fabricated bent cap comprises a bent cap body and a pier column, the bent cap body is arranged above the pier column, a reserved slot is formed in the middle of the top end of the bent cap body, and the reserved slot is arranged in a rectangular shape, a plurality of metal bellows are preembedded in the inside of the bent cap body and below the reserved slot, a ring beam is cast at the bottom of the bent cap body and at a position corresponding to the reserved slot, the top end and the bottom end of the metal bellows respectively penetrate the reserved slot and the bottom of the bent cap body, a boss groove is formed in the middle of the inner side of the ring beam of the lower surface of the bent cap body, a receiving groove is formed in the middle of the inner bottom wall of the receiving groove of the pier column, a positioning assembly is arranged in the middle of the inner bottom wall of the receiving groove, and the positioning assembly corresponds to the boss groove, and an insertion slot is formed in the inner bottom wall of the receiving groove and at a position corresponding to the metal bellows.

[0007] In a further embodiment, a plurality of the metal bellows are arranged in a rectangular shape along the inner side of the reserved slot, and a steel bar is arranged in the inside of the metal bellows.

[0008] In further embodiments, the inner bottom wall of the reserved groove is fixedly connected with a steel plate at a position corresponding to the metal bellows, a through hole is formed in the middle of the steel plate, and a steel sleeve is fixedly connected to the upper surface of the steel plate outside the through hole.

[0009] In further embodiments, the top end of the steel bar penetrates the top end of the metal bellows, the through hole and the steel sleeve in sequence and extends into the reserved groove, and the bottom end of the steel bar penetrates the bottom end of the metal bellows, the ring beam and the receiving groove in sequence and extends into the insertion groove.

[0010] In further embodiments, the cross section of the boss groove is isosceles trapezoidal, a plurality of first flow channels are formed in the inner wall of the boss groove, and the first flow channels are arranged in a ring shape about the central axis of the boss groove, and the first flow channels are arranged in an arc shape.

[0011] In further embodiments, a pouring hole is formed upward in the inner top wall of the boss groove at a position corresponding to the top end of the first flow channel, and the top end of the pouring hole is in communication with the middle part of the reserved groove.

[0012] In further embodiments, the positioning assembly comprises a circular table, the lower surface of the circular table is fixedly connected to the middle part of the inner bottom wall of the receiving groove, the upper surface of the circular table is fixedly connected with a conical boss, the conical boss is matched with the boss groove, and the upper surface of the circular table is flush with the upper surface of the pier column.

[0013] In further embodiments, a plurality of second flow channels are formed in the side surface of the conical boss, the second flow channels are the same as the first flow channels, the second flow channels are oppositely arranged with the first flow channels, and the second flow channels and the first flow channels jointly enclose a circular cavity, the circular cavity is in communication with the pouring hole, the diameter of the circular cavity is larger than the diameter of the pouring hole, and the diameter of the bottom of the conical boss is larger than the diameter of the circular table.

[0014] In further embodiments, the size of the ring beam is smaller than the size of the receiving groove, the ring beam is inserted into the inside of the receiving groove, and the lower surface of the bent cap body is in contact with the upper surface of the pier column.

[0015] In addition, the present application also provides a construction method of the fabricated bent cap, which comprises the following steps:

[0016] S1, steel cage manufacturing: the processed steel bars are bound into a steel cage, and a metal bellows is pre-buried at the bottom of the steel cage;

[0017] S2, template assembly of the prefabricated bent cap: the templates of the prefabricated bent cap body are assembled by using a bottom template, side templates, end templates and supports, the bottom template is made to have a structure corresponding to the boss groove, and the stress of the templates is calculated by finite element analysis;

[0018] S3, template in cast-in-place concrete and curing: the ratio of qualified concrete using vertical pouring way for pouring, and using a vibrating rod for auxiliary vibration, after pouring is completed, take the plastic film health care method for curing, the inner and outer temperature difference of the cap beam body is controlled within 15 DEG C, after curing, remove the formwork;

[0019] S4, the top of the pier column is provided with a receiving groove and a slot, a steel reinforcement cage is arranged in the middle of the receiving groove by steel reinforcement binding, a cylindrical formwork and a conical formwork are supported outside the steel reinforcement cage, qualified concrete is poured by vertical pouring, and a vibrating rod is used for auxiliary vibration, a structure corresponding to the conical formwork is formed, after pouring is completed, a plastic film health care method is used for curing, and the formwork is removed after curing.

[0020] S5, hoisting the prefabricated cap beam: the top of the cap beam body and the pier column is cleaned and moistened, the conical formwork is accurately embedded into the boss groove, and the ring beam is embedded into the receiving groove, at this time, the first flow channel and the second flow channel jointly enclose a circular cavity, the metal bellows is opposite to the slot, and hoisting is completed.

[0021] S6, grouting: the steel bars are inserted into the metal bellows in sequence, the bottom end of the steel bars is inserted into the slot, then UHPC grouting material is poured through the pouring hole, the UHPC grouting material enters the receiving groove and the slot through the circular cavity, according to the design grouting amount, the UHPC grouting material fills the slot and the receiving groove, then UHPC concrete is poured into the metal bellows to increase the strength, after the UHPC concrete is poured, the steel plate and the steel sleeve are installed on the top of the steel bars to strengthen and anchor the cap beam body, and finally high-performance concrete is poured into the reserved slot.

[0022] Compared with the prior art, the cap beam body and the pier column are connected through the boss groove and the positioning assembly, the first flow channel and the second flow channel are connected through the receiving groove and the slot, the UHPC grouting material is poured through the pouring hole, the UHPC concrete is poured into the metal bellows, the steel plate and the steel sleeve are installed on the top of the steel bars, and the high-performance concrete is poured into the reserved slot.

[0023] In the application, the boss groove and the positioning assembly are used for guiding and positioning during hoisting, so that the accuracy of hoisting and splicing is improved; after hoisting is completed, the conical formwork and the boss groove are matched, the ring beam and the receiving groove are matched, the first flow channel and the second flow channel form a circular cavity and are connected with the pouring hole, the pouring convenience is ensured, and the firmness between the cap beam body and the pier column is ensured; meanwhile, the steel bars are inserted into the metal bellows after the cap beam body and the pier column are spliced, and the UHPC concrete is poured into the metal bellows, so that the splicing efficiency is ensured, and the steel bars are prevented from being damaged. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a three-dimensional structure schematic view of the cap beam body and the pier column after splicing in the application;

[0025] Figure 2 It is a left view sectional structure schematic view after splicing in the application;

[0026] Figure 3 It is the cover beam body and pier explosion structure schematic diagram in the application;

[0027] Figure 4 It is another perspective stereoscopic structure schematic diagram of the cover beam body in the application;

[0028] Figure 5 It is another perspective stereoscopic structure schematic diagram of the pier in the application;

[0029] Figure 6 It is the cover beam body and pier explosion structure schematic diagram in the application; Figure 2 It is the enlarged structure schematic diagram of A in the application;

[0030] Figure 7 It is the cover beam body and pier explosion structure schematic diagram in the application; Figure 3 It is the enlarged structure schematic diagram of B in the application;

[0031] Figure 8 It is the cover beam body and pier explosion structure schematic diagram in the application; Figure 4 It is the enlarged structure schematic diagram of C in the application.

[0032] In the figure: 1, cover beam body; 2, pier; 3, positioning assembly; 4, metal bellows; 5, steel bar; 6, steel plate; 7, steel bar sleeve;

[0033] 101, reserved groove; 102, ring beam; 103, boss groove; 104, first flow channel; 105, pouring hole;

[0034] 201, receiving groove; 202, insertion groove;

[0035] 301, circular table; 302, conical boss; 303, second flow channel. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0037] Please refer to Figures 1-8In the embodiment of the present application, a prefabricated bent cap comprises a bent cap body 1 and a pier 2, the bent cap body 1 is arranged above the pier 2, a reserved slot 101 is arranged in the middle of the top of the bent cap body 1, and the reserved slot 101 is arranged in a rectangular shape, a plurality of metal bellows 4 are embedded in the inside of the bent cap body 1 and below the reserved slot 101, the embedded metal bellows 4 can save costs, a ring beam 102 is cast at the bottom of the bent cap body 1 and at a position corresponding to the reserved slot 101, the top and bottom ends of the metal bellows 4 respectively penetrate the reserved slot 101 and the bottom of the bent cap body 1, a boss groove 103 is arranged in the middle of the inner side of the ring beam 102, a receiving groove 201 is arranged in the middle of the top of the pier 2, a positioning assembly 3 is arranged in the middle of the inner bottom wall of the receiving groove 201, and the positioning assembly 3 corresponds to the boss groove 103, the positioning assembly 3 can quickly assemble the bent cap body 1 with the pier 2, and the assembly efficiency is improved; a slot 202 is arranged in the inner bottom wall of the receiving groove 201 and at a position corresponding to the metal bellows 4;

[0038] Specifically, the plurality of metal bellows 4 are arranged in a rectangular shape along the inner side of the reserved slot 101, and a steel bar 5 is arranged in the inside of the metal bellows 4, wherein the diameter of the metal bellows 4 is 60 mm, and the diameter of the steel bar 5 is 32 mm, and pouring UHPC concrete between the metal bellows 4 and the steel bar 5 can increase the strength thereof;

[0039] The inner bottom wall of the reserved slot 101 is fixedly connected with a steel plate 6 at a position corresponding to the metal bellows 4, a through hole is arranged in the middle of the steel plate 6, and a steel bar sleeve 7 is fixedly connected to the upper surface of the steel plate 6 and located outside the through hole; wherein the size of the steel plate 6 is 10 cm*10 cm*1 cm, the diameter of the through hole in the steel plate 6 is 38 mm, and the steel plate 6 and the steel bar sleeve 7 can strengthen and anchor the bent cap body 1;

[0040] The top end of the steel bar 5 penetrates the top end of the metal bellows 4, the through hole and the steel bar sleeve 7 in sequence and extends into the reserved slot 101, and the bottom end of the steel bar 5 penetrates the bottom end of the metal bellows 4, the ring beam 102 and the receiving groove 201 in sequence and extends into the slot 202;

[0041] Further, the cross section of the boss groove 103 is isosceles trapezoidal, a plurality of first flow channels 104 are arranged in the inner wall of the boss groove 103, and the plurality of first flow channels 104 are arranged in a ring array about the central axis of the boss groove 103, and the first flow channels 104 are arranged in an arc shape; in this way, the boss groove 103 can cooperate with the positioning assembly 3, not only can realize quick assembly, but also can enhance the firmness of the bent cap body 1;

[0042] Further, the inner top wall of the boss groove 103 is upwardly provided with a pouring hole 105 corresponding to the top end of the first flow channel 104, and the top end of the pouring hole 105 is in communication with the middle part of the reserved groove 101; in this way, the pouring hole 105 facilitates pouring of the UHPC seat slurry into the receiving groove 201.

[0043] Further, the positioning assembly 3 comprises a circular table 301, the lower surface of the circular table 301 is fixedly connected to the middle part of the inner bottom wall of the receiving groove 201, the upper surface of the circular table 301 is fixedly connected with a conical boss 302, the conical boss 302 is matched with the boss groove 103, and the upper surface of the circular table 301 is flush with the upper surface of the pier 2; in this way, the conical boss 302 and the boss groove 103 can guide the cover beam body 1 to be quickly assembled with the pier 2.

[0044] Further, the side surface of the conical boss 302 is provided with a plurality of second flow channels 303, the second flow channels 303 are the same as the first flow channel 104, the second flow channels 303 are oppositely arranged with the first flow channel 104, and the second flow channels 303 and the first flow channel 104 jointly enclose a circular cavity, the circular cavity is in communication with the pouring hole 105, the diameter of the circular cavity is greater than the diameter of the pouring hole 105, and the diameter of the bottom of the conical boss 302 is greater than the diameter of the circular table 301; in this way, the circular cavity and the pouring hole 105 can cooperate to enable the poured UHPC seat slurry to be quickly injected into the receiving groove 201 and the insertion groove 202.

[0045] Further, the size of the ring beam 102 is smaller than the size of the receiving groove 201, the ring beam 102 is inserted into the inside of the receiving groove 201, and the lower surface of the cover beam body 1 is in contact with the upper surface of the pier 2; in this way, the ring beam 102 is embedded in the receiving groove 201, and the UHPC seat slurry is combined to strengthen the firmness between the cover beam body 1 and the pier 2.

[0046] The embodiment also provides a construction method of the assembled cover beam, which comprises the following steps:

[0047] S1, steel reinforcement cage manufacturing: the processed steel reinforcement is bound into a steel reinforcement cage, and a metal bellows 4 is pre-buried at the bottom of the steel reinforcement cage;

[0048] S2, template assembly of the prefabricated cover beam: a bottom template, a side template, an end template and a support are used to assemble the template of the prefabricated cover beam body 1, the bottom template is made to have a structure corresponding to the boss groove 103, and finite element analysis and calculation are performed on the stress of the template;

[0049] S3, pouring of concrete in the template and maintenance: the qualified mixed concrete is poured by using a vertical pouring method, and is assisted by using a vibrating rod, after the pouring is completed, a plastic film maintenance method is used for maintenance, the temperature difference between the inside and outside of the cover beam body 1 is controlled to be 15℃, and the template is disassembled after the maintenance is completed;

[0050] S4, a receiving groove 201 and a slot 202 are formed at the top end of the pier column 2, and a steel reinforcement cage of a round table 301 and a conical boss 302 is bound by steel reinforcement in the middle of the receiving groove 201, and a cylindrical formwork and a formwork of the conical boss 302 are supported outside the prepared steel reinforcement cage, and the concrete with a qualified proportion is poured by using a vertical pouring method, and a vibrating rod is used for auxiliary vibration, and a structure corresponding to the conical boss 302 is formed, and after pouring is completed, a plastic film curing method is used for curing, and after curing is completed, the formwork is removed.

[0051] S5, lifting the prefabricated cap beam: clean and moisten the top of the cap beam body 1 and the pier column 2, align the boss groove 103 with the conical boss 302, make the conical boss 302 accurately embedded in the boss groove 103, and at the same time, the ring beam 102 is embedded in the receiving groove 201, at this time, the first flow channel 104 and the second flow channel 303 jointly enclose a circular cavity, the metal bellows 4 is opposite to the slot 202, and the lifting is completed.

[0052] S6, grouting: the steel bars 5 are inserted into the metal bellows 4 in sequence, the bottom end of the steel bars 5 is inserted into the slot 202, then UHPC grouting material is poured through the pouring hole 105, the UHPC grouting material enters the receiving groove 201 and the slot 202 through the circular cavity, according to the designed pouring amount, after the UHPC grouting material fills the slot 202 and the receiving groove 201, UHPC concrete is poured into the metal bellows 4 to increase the strength; after the UHPC concrete is poured, the steel plate 6 and the steel sleeve 7 are installed at the top of the steel bars 5 to strengthen and anchor the cap beam body 1; finally, high-performance concrete is poured into the reserved slot 101.

[0053] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0054] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A fabricated bent, characterized in that, The utility model provides a cover beam body (1) and pier (2) are included, the cover beam body (1) sets up in the upper of pier (2), the cover beam body (1) top middle part is provided with the reserved slot (101), and the reserved slot (101) is rectangularly arranged, the inside of cover beam body (1) and is located the reserved slot (101) below and embeds a plurality of metal bellows (4), the bottom of cover beam body (1) and the position of corresponding with the reserved slot (101) pours and has the ring beam (102), the top end and bottom end of metal bellows (4) respectively penetrates the reserved slot (101) and the bottom of cover beam body (1), the lower surface of cover beam body (1) and the inside middle part of ring beam (102) is provided with the boss groove (103), the top middle part of pier (2) is provided with the receiving groove (201), the inner bottom wall middle part of receiving groove (201) is provided with the positioning assembly (3), and the positioning assembly (3) corresponds with boss groove (103), the inner bottom wall of receiving groove (201) and the position of corresponding with metal bellows (4) is provided with the insertion slot (202), The cross section of the boss groove (103) is isosceles trapezoidal, a plurality of first flow channels (104) are formed in the inner wall of the boss groove (103), and the plurality of first flow channels (104) are annularly arranged about the central axis of the boss groove (103), and the first flow channels (104) are arc-shaped. An upper pouring hole (105) is formed in the inner top wall of the boss groove (103) and corresponds to the top end of the first flow channel (104). The positioning assembly (3) includes a circular table (301), the lower surface of the circular table (301) is fixedly connected to the inner bottom wall middle part of the receiving groove (201), the upper surface of the circular table (301) is fixedly connected with a conical boss (302), the conical boss (302) is matched with the boss groove (103), and the upper surface of the circular table (301) is flush with the upper surface of the pier (2). A plurality of second flow channels (303) are formed in the side surface of the conical boss (302), the second flow channels (303) are the same as the first flow channels (104), the second flow channels (303) are oppositely arranged with the first flow channels (104), and the second flow channels (303) and the first flow channels (104) jointly enclose a circular cavity, the circular cavity is communicated with the pouring hole (105), the diameter of the circular cavity is larger than the diameter of the pouring hole (105), and the diameter of the bottom of the conical boss (302) is larger than the diameter of the circular table (301).

2. The fabricated bent cap according to claim 1, wherein A plurality of the metal bellows (4) are rectangularly arranged along the inner side of the reserved slot (101), and a steel bar (5) is arranged in the interior of the metal bellows (4).

3. The fabricated bent cap of claim 1, wherein A steel plate (6) is fixedly connected to the inner bottom wall of the reserved slot (101) and corresponds to the metal bellows (4), a through hole is formed in the middle part of the steel plate (6), and a steel sleeve (7) is fixedly connected to the upper surface of the steel plate (6) and located outside the through hole.

4. The fabricated bent cap of claim 2, wherein The top end of the steel bar (5) penetrates the top end, the through hole and the steel sleeve (7) of the metal bellows (4) in sequence and extends into the reserved slot (101), and the bottom end of the steel bar (5) penetrates the bottom end of the metal bellows (4), the ring beam (102) and the receiving groove (201) in sequence and extends into the insertion groove (202).

5. The fabricated bent cap of claim 1, wherein The size of the ring beam (102) is smaller than the size of the receiving groove (201), the ring beam (102) is inserted into the inside of the receiving groove (201), and the lower surface of the bent cap body (1) is in contact with the upper surface of the pier (2).

6. A method of constructing a fabricated bent as claimed in any one of claims 1 to 5, wherein, It comprises the following steps: S1, steel bar cage manufacturing: the processed steel bars are bound into a steel bar cage, and a metal bellows (4) is pre-buried at the bottom of the steel bar cage; S2, template assembly of prefabricated bent cap: the template of the prefabricated bent cap body (1) is assembled by using a bottom template, side templates, end templates and supports, the bottom template is made to have a structure corresponding to the boss groove (103), and the stress of the template is calculated by finite element analysis; S3, pouring concrete in the template and curing: the qualified mixed concrete is poured by using vertical pouring, and auxiliary vibration is performed by using a vibrating rod, after pouring is completed, plastic film curing method is adopted for curing, the temperature difference between the inside and outside of the bent cap body (1) is controlled within 15℃, and the template is disassembled after curing is completed; S4, a receiving groove (201) and an insertion groove (202) are formed at the top end of the pier (2), a steel bar cage of a round table (301) and a conical boss (302) is bound by steel bars at the middle part of the receiving groove (201), a cylindrical template and a template of the conical boss (302) are supported outside the steel bar cage, the qualified mixed concrete is poured by using vertical pouring, and auxiliary vibration is performed by using a vibrating rod, the conical boss (302) is made to have a structure corresponding to the conical boss (302), after pouring is completed, plastic film curing method is adopted for curing, and the template is disassembled after curing is completed; S5, hoisting the prefabricated bent cap: the top of the bent cap body (1) and the pier (2) is cleaned and moistened, the boss groove (103) is aligned with the conical boss (302), the conical boss (302) is accurately embedded into the boss groove (103), and the ring beam (102) is embedded into the receiving groove (201), at this time, the first flow channel (104) and the second flow channel (303) jointly enclose a circular cavity, the metal bellows (4) is opposite to the insertion groove (202), and hoisting is completed; S6, grouting: the steel bar (5) is inserted into the metal bellows (4) in sequence, the bottom end of the steel bar (5) is inserted into the insertion groove (202), then UHPC grouting material is poured through the pouring hole (105), the UHPC grouting material enters the receiving groove (201) and the insertion groove (202) through the circular cavity, according to the designed pouring amount, after the insertion groove (202) and the receiving groove (201) are filled with the UHPC grouting material, UHPC concrete is poured into the metal bellows (4) to increase the strength; after the UHPC concrete is poured, the steel plate (6) and the steel sleeve (7) are installed at the top of the steel bar (5) to strengthen and anchor the bent cap body (1); finally, high-performance concrete is poured into the reserved slot (101).

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