A u-shaped high performance concrete (uhpc) filling method for an assembled beam-column built-in t-shaped steel joint

Abstract

The application discloses a kind of assembled beam column built-in T-shaped steel node fills UHPC connection method, including prefabricated beam column, node connection, damping setting and sleeve mould grouting steps, the method utilizes mould mechanism prefabricated concrete column with T-shaped steel and laminated beam, then connect T-shaped steel in beam and column by high-strength bolt, and set damping device between the upper and lower relative wing plate of T-shaped steel, finally, sleeve U-shaped mould in node connection part, pour ultra-high strength concrete UHPC, enhance the integrity of node, improve the ductility and energy dissipation capacity of node, realize fast, reliable node connection, both guarantee the high efficiency of node area mechanics transmission, also have reliable anti-seismic energy dissipation characteristics, the method has the advantages of convenient construction, superior anti-seismic performance, node reliability is high, applicable to the demand for efficient, environmental protection, safety in modern building, can improve the construction efficiency and structural performance of prefabricated building.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated building, in particular to a prefabricated beam-column built-in T-shaped steel node UHPC filling connection method. BACKGROUND

[0002] In modern construction, cast-in-place reinforced concrete structure has good integrity and seismic performance, but its construction period is long, affected by weather, and a large amount of manpower and material resources are needed during construction, which is not easy to arrange quickly and is easy to cause pollution. In order to meet the increasing efficiency and environmental protection requirements, prefabricated buildings have emerged as the times require, which significantly shortens the construction period, improves the construction efficiency and quality, and has a wide market prospect. Among them, the node connection technology is one of the key links of prefabricated building. The beam-column node, as an important part of the structure, not only needs to ensure sufficient bearing capacity and stiffness, but also needs to have good seismic performance and construction convenience. At present, the common node connection methods in prefabricated buildings include bolt connection, welding connection, etc. These connection methods are mostly used in steel beams and columns, and it is difficult to effectively connect the concrete beams and columns, so that the frame structure connected in this way has poor seismic performance and is easy to corrode and deform, and there are problems such as bolt loosening, welding operation skill requirement is too high, etc., and a new connection method is needed to solve the above problems. SUMMARY

[0003] In order to solve the above problems, the present application provides a prefabricated beam-column built-in T-shaped steel node UHPC filling connection method, which comprises the following steps:

[0004] Preparation of prefabricated beam column: prefabricate concrete column and composite beam through mold mechanism, the connecting end of the concrete column is provided with column end T-shaped steel, and the connecting end of the composite beam is provided with beam end T-shaped steel;

[0005] Node connection: butt joint the concrete column and the composite beam, so that the column end T-shaped steel is opposite to each reserved hole on the beam end T-shaped steel, install high-strength bolts at the reserved holes, and connect the beam and the column;

[0006] Damping setting: set damping devices between the upper and lower opposite flanges of the column end T-shaped steel and the beam end T-shaped steel;

[0007] Sleeve mold grouting: sleeve U-shaped mold at the connecting part of the concrete column and the composite beam, and fill UHPC in the U-shaped mold, during the grouting process, the exhaust passage is kept unobstructed, until the exhaust passage discharges uniform grouting material, stop grouting, and complete the prefabricated node connection.

[0008] Further, the damping device comprises a metal bellows, the metal bellows is built-in damping spring, and the upper and lower pipe openings of the metal bellows are welded with the flanges of the beam end T-shaped steel and the column end T-shaped steel respectively.

[0009] Further, the mold mechanism comprises a base, a buffer sponge is laid on the top surface of the base, a hinge joint on the two sides of the base is rotationally connected with a hinge joint outside an end plate of a mold groove, a baffle is slidingly connected in the mold groove, a convex groove on the two sides of the mold groove is slidingly connected with a head of a positioning bolt, a rod part of the positioning bolt is fastened through a nut after passing through ear blocks on the two sides of the baffle, the baffle is a replacement part, a beam end T groove is formed on part of the baffle, a column end T groove is formed on an end part of a groove bottom of the mold groove, and a plurality of counter-holes matched with each other are formed on opposite surfaces of the baffle and the end plate of the mold groove.

[0010] Further, the beam end T-shaped steel is assembled in a positive T shape, the reserved hole is a circular hole, the column end T-shaped steel is assembled in an inverted T shape, and the reserved hole is a vertical waist hole.

[0011] Further, a plurality of through holes with a diameter of 10-20 mm are arranged on the embedded end of the web of the column end T-shaped steel and the beam end T-shaped steel, and the embedded end is welded with longitudinal reinforcement and stirrup in the beam and the column to form an integral whole.

[0012] Further, a gasket plate is arranged between opposite surfaces of the web connecting end of the column end T-shaped steel and the beam end T-shaped steel.

[0013] Further, a support device is used to assist the node in the grouting stage of the sleeve mold, the support device comprises a main cylinder, a slant cylinder is hingedly connected to the top end of the main cylinder, a threaded cavity in the two cylinders is connected with a foot screw rod from the bottom end, the foot screw rod is hingedly connected with an anchor seat at the end part, the anchor seat is connected with the ground through a bolt, and a threaded support rod is connected with the upper end of the threaded cavity of the main cylinder.

[0014] The present application has the following advantages:

[0015] In the present application, the positive and reverse overlapping of the two types of T-shaped steel enhances the bearing capacity and anti-deformation capacity of the concrete column, and through the three connection modes of high-strength bolt connection, damping device welding and UHPC pouring, the node has high strength, stiffness and good ductility, can effectively dissipate energy in extreme environments such as earthquakes, and ensures the safety of the building structure; the construction process of the present application is relatively simple, convenient to operate, reduces the requirement for the technical level of the construction personnel, and reduces the labor cost. At the same time, the high-precision prefabricated components and on-site installation reduce the construction error, further improve the structure quality, reduce the later maintenance cost, and the problem of bolt loosening will not occur; the present application is suitable for factory prefabrication production, conforms to the development trend of building industrialization, can ensure the size precision and quality stability of the components, and the standardized connection process reduces the influence of the technical level difference of the on-site construction personnel on the quality of the node, ensures the reliability and consistency of the node connection, can be widely applied to various types of prefabricated concrete structure buildings, has good economic benefit and social benefit. Attached Figure Description

[0016] Figure 1 This is a front view of the connection structure of the present invention;

[0017] Figure 2 This is a perspective view of the connection structure of the present invention;

[0018] Figure 3 This is a sectional view of the connection structure of the present invention from an oblique angle.

[0019] Figure 4 This is a front view schematic diagram of the mold mechanism in this invention when producing concrete columns;

[0020] Figure 5 This is a front view schematic diagram of the mold mechanism in this invention when producing composite beams;

[0021] Figure 6 This is a side view of the mold mechanism in this invention when producing composite beams;

[0022] Figure 7 This is a top view of the mold mechanism in this invention.

[0023] Figure 8 This is a schematic diagram of the support device in this invention.

[0024] The reference numerals in the attached drawings are explained as follows: 1. Concrete column; 2. Composite beam; 3. Column end T-shaped steel; 4. Beam end T-shaped steel; 5. High-strength bolt; 6. U-shaped mold; 7. Corrugated metal pipe; 8. Damping spring; 9. Base; 901. Hinge column; 10. Buffer sponge; 11. Mold groove; 1101. Hinge joint; 1102. Convex groove; 1103. Column end T-groove; 12. Baffle; 1201. Beam end T-groove; 13. Longitudinal reinforcement; 14. Stirrup; 15. Main tube column; 16. Inclined tube column; 17. Support bolt; 18. Anchor seat; 19. Threaded strut; 20. Positioning bolt. Detailed Implementation

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The present invention will be further described below with reference to the accompanying drawings:

[0028] like Figures 1 to 8 As shown, a method for connecting prefabricated beams and columns with embedded T-shaped steel joints using UHPC (Ultra-High-Pressure Polymer) includes the following steps:

[0029] Precast beams and columns: Concrete columns 1 and composite beams 2 are precast using a mold mechanism. The connecting ends of concrete columns 1 are provided with column end T-shaped steel 3, and the connecting ends of composite beams 2 are provided with beam end T-shaped steel 4.

[0030] The mold mechanism includes a base 9, with a cushioning sponge 10 laid on the top surface of the base 9. Hinged columns 901 on both sides of the base 9 are rotatably connected to hinge joints 1101 on the outer side of the end plate of the mold groove 11. After the pins on the hinged columns 901 are inserted into the hinge joints 1101, the mold groove 11 can be fixed in an open-facing position. After the pins are removed, the mold groove 11 can be rotated via the handle at the end of the hinge joint 1101. A baffle 12 is slidably connected inside the mold groove 11. The heads of positioning bolts 20 are slidably connected to the convex grooves 1102 on both sides of the mold groove 11. The rods of the positioning bolts 20 pass through the lugs on both sides of the baffle 12 and are tightened by nuts. The baffle 12 is a replaceable part; some baffles 12 have beam-end T-grooves 1201, and the bottom end of the mold groove 11 has column-end T-grooves 1103. Several matching countersunk holes are formed on the opposing surfaces of the baffle 12 and the end plate of the mold groove 11.

[0031] When using precast concrete column 1 (see...) Figure 4 Insert an ungrooved baffle 12 into the mold groove 11, insert both ends of the longitudinal reinforcement 13 into the countersunk holes, then tighten the positioning bolts 20 to fix the baffle 12, insert the column end T-shaped steel 3 into the column end T-groove 1103, so that the connecting end of the column end T-shaped steel 3 passes through the bottom of the mold groove 11, and the embedded end left in the mold groove 11 is welded to the longitudinal reinforcement 13 and the stirrup 14 to form a whole, forming a stable skeleton. Then pour concrete that meets the design strength grade and cure it to the specified strength.

[0032] When precast composite beam 2 (see Figure 5), two baffle plates 12 with beam end T-shaped groove 1201 are inserted into the mold groove 11, the longitudinal reinforcement 13 is inserted into the hole, and then the positioning bolt 20 is tightened to fix the baffle plate 12, the beam end T-shaped steel 4 is inserted into the beam end T-shaped groove 1201, the connecting end of the beam end T-shaped steel 4 is inserted into the baffle plate 12, and the embedded end between the two baffle plates 12 is welded with the longitudinal reinforcement 13 and the stirrup 14 to form a stable skeleton, and then the concrete with the design strength grade is poured and cured to the specified strength.

[0033] The web embedded end of the column end T-shaped steel 3 and the beam end T-shaped steel 4 is provided with a plurality of through holes with a diameter of 10-20 mm, which facilitates the flow of concrete during pouring and enhances the connection integrity. When the beam and column are prefabricated, the bolt is pulled out and the handle is rotated to unload it onto the buffer sponge 10.

[0034] Node connection: the concrete column 1 and the composite beam 2 are hoisted to the designed position by using hoisting equipment, the reserved holes on the column end T-shaped steel 3 and the beam end T-shaped steel 4 are aligned, high-strength bolts 5 are installed at the reserved holes and tightened to the designed pre-tightening force, and the beam and column are connected. Among them, the beam end T-shaped steel 4 is assembled in a positive T shape, and its reserved hole is a round hole. The column end T-shaped steel 3 is assembled in an inverted T shape, and its reserved hole is a vertical waist hole. A gasket can be arranged between the opposite surfaces of the web connecting end of the column end T-shaped steel 3 and the beam end T-shaped steel 4.

[0035] Damping setting: damping devices are arranged between the opposite flanges of the column end T-shaped steel 3 and the beam end T-shaped steel 4, the damping devices include a metal bellows 7, the metal bellows 7 is internally provided with a damping spring 8, and the upper and lower tube openings of the metal bellows 7 are welded with the flanges of the beam end T-shaped steel 4 and the column end T-shaped steel 3, respectively.

[0036] Mold grouting: a U-shaped mold 6 is sleeved on the connection between the concrete column 1 and the composite beam 2, and the inner side surface of the U-shaped mold 6 is tightly fitted with the outer side surface of the composite beam 2 by supporting the bottom of the U-shaped mold 6 through a supporting device, wherein the supporting device includes a main cylinder 15, the main cylinder 15 is hinged to the top end of an inclined cylinder 16, the threaded cavities in the two cylinders are connected to foot screws 17 from the bottom end, the end of the foot screws 17 is hinged to an anchor base 18, the anchor base 18 is connected to the ground through bolts, and the threaded cavities at the upper end of the main cylinder 15 are connected to threaded support rods 19, which can be rotated to adjust the support height.

[0037] When the U-shaped die 6 is fixed, super high strength concrete UHPC is poured at the node. During pouring, the exhaust passage needs to be kept unobstructed to ensure that the concrete fully fills all gaps between the beam-column end connection nodes, so as to eliminate the weakness of the connection part and ensure the compactness of the structure. When the exhaust passage discharges uniform grouting material, stop grouting and wait for the concrete to solidify. During solidification, the concrete and the T-shaped steel form a firm embedded connection, so that the beam-column node becomes an integral whole. The solidified node has high tensile and compressive properties, which can effectively improve the strength and stability of the beam-column connection part.

[0038] The application has excellent seismic performance and bearing capacity through the triple connection mode of high-strength bolt connection, damping device welding and UHPC pouring, has the advantages of convenient construction, superior seismic performance, high node reliability and the like, is suitable for the demand for high efficiency, environmental protection and safety in modern buildings, and can improve the construction efficiency and structural performance of prefabricated buildings.

[0039] The basic principles, main features and advantages of the application are shown and described above. Those skilled in the art should understand that the application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the application. Without departing from the spirit and scope of the application, various changes and improvements can be made to the application, and these changes and improvements all fall within the scope of the claimed application.

Claims

1. A method for pouring UHPC in a fabricated beam-column built-in T-shaped steel joint connection, characterized in that, The method comprises the following steps: Preparation of beam column: prefabricate concrete column (1) and composite beam (2) through mold mechanism, the connecting end of concrete column (1) is provided with column end T-shaped steel (3), the connecting end of composite beam (2) is provided with beam end T-shaped steel (4), the mold mechanism comprises base (9), the top surface of base (9) is paved with buffer sponge (10), the two sides of base (9) are hingedly connected with hinge joints (1101) on the outer side of the end plate of mold groove (11) through rotating connection of hinge column (901), the inner side of mold groove (11) is slidably connected with baffle (12), the head of positioning bolt (20) is slidably connected with convex groove (1102) on the two sides of mold groove (11), the rod of positioning bolt (20) is fastened through nut after passing through the ear blocks on the two sides of baffle (12), baffle (12) is a replacement part, beam end T-shaped groove (1201) is formed on part of baffle (12), column end T-shaped groove (1103) is formed on the bottom end of mold groove (11), a plurality of counterbores matched with each other are formed on the opposite surfaces of baffle (12) and the end plate of mold groove (11); Node connection: the concrete column (1) and the composite beam (2) are butted, the reserved holes on the column end T-shaped steel (3) and the beam end T-shaped steel (4) are opposite, the high-strength bolt (5) is installed at the reserved holes, the beam and the column are connected, the beam end T-shaped steel (4) is assembled in the form of a positive T, the reserved hole thereof is a circular hole, the column end T-shaped steel (3) is assembled in the form of an inverted T, and the reserved hole thereof is a vertical waist hole; Damping setting: the damping device is arranged between the upper and lower wings of the column end T-shaped steel (3) and the beam end T-shaped steel (4), the damping device comprises a metal bellows (7), the metal bellows (7) is internally provided with a damping spring (8), and the upper and lower pipe openings of the metal bellows (7) are welded with the wings of the beam end T-shaped steel (4) and the column end T-shaped steel (3) respectively; U-shaped mold (6) is sleeved on the connection part of the concrete column (1) and the composite beam (2), UHPC is poured into the U-shaped mold (6), during the pouring process, the exhaust passage is kept unobstructed, until the exhaust passage discharges uniform grouting material, the pouring is stopped, and the assembly type node connection is completed.

2. The method according to claim 1, characterized in that, A plurality of through holes are formed in the web of the column end T-shaped steel (3) and the beam end T-shaped steel (4), the diameter of the through holes is 10-20 mm, and the web embedding end is welded with the longitudinal reinforcement (13) and the stirrup (14) in the beam and the column to form an integral whole.

3. The method according to claim 1, characterized in that, A gasket is arranged between the opposite surfaces of the web connecting end of the column end T-shaped steel (3) and the beam end T-shaped steel (4).

4. The method according to claim 1, characterized in that, Supporting device is used to assist the node pouring during the U-shaped mold pouring stage, the supporting device comprises a main cylinder (15), the top end of the main cylinder (15) is hingedly connected with an inclined cylinder (16), the threaded cavities in the two cylinders are connected with foot screws (17) from the bottom end, the end of the foot screw (17) is hingedly connected with an anchor base (18), the anchor base (18) is connected with the ground through a bolt, and the upper end of the threaded cavity of the main cylinder (15) is connected with a threaded support rod (19).

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