A prefabricated UHPC node component and connection method

Abstract

The present invention discloses a prefabricated UHPC node component and a connection method, including a prefabricated UHPC node component, a prefabricated concrete column, and a prefabricated concrete beam; the prefabricated UHPC node component is composed of a UHPC layer, core area concrete, a U-shaped groove, a reserved hole, and a reserved steel bar; the prefabricated concrete column and the prefabricated UHPC node component are connected through a mortar layer, the prefabricated concrete beam and the prefabricated UHPC node component are connected through a common concrete post-casting section, the prefabricated concrete lower column longitudinal reinforcement passes through the node component, the column longitudinal reinforcement is fixed in a steel sleeve located in the mortar layer, and the beam longitudinal reinforcement and the reserved steel bar are connected through a steel sleeve in the common concrete post-casting section. The present invention uses UHPC for the outside of the node by prefabricating the UHPC node component, avoids the complex construction problem of the node area, improves the structural force performance, enhances the durability of the node, overcomes the problem of difficult maintenance of cast-in-place UHPC, saves the amount of materials, and reduces the cost.

Description

Technical Field

[0001] The invention relates to the field of construction engineering, and in particular to a method for connecting a prefabricated node component with a beam column. Background Art

[0002] (1) In prefabricated building structures, prefabricated columns and prefabricated beams are connected through nodes. The seismic performance of the connection nodes has always been a key issue in prefabricated structures. During construction, the node area is often reinforced with stirrups and the steel bars at the ends of beams and columns are overlapped, resulting in steel bar congestion, making construction difficult and affecting the casting quality of the node area.

[0003] (2) Ultra-high performance concrete (UHPC) is a new type of cement-based composite material with ultra-high tensile and compressive strength, ductility and good durability. However, UHPC materials have high requirements for curing conditions. It is difficult for cast-in-place UHPC to meet its curing conditions during construction, resulting in the failure of UHPC to fully exert its performance.

[0004] (3) Due to the excellent performance of UHPC, the amount of UHPC required to meet the strength requirements is much smaller than that of ordinary concrete. However, due to the limitation of node size, if UHPC is poured entirely in the node area, it will lead to material waste and increased costs. Summary of the invention

[0005] Purpose of the invention: The present invention provides a prefabricated UHPC node component and a method for connecting it with beams and columns. The method uses UHPC in the most critical node area of ​​the structure, avoids the complex construction problems in the node area, improves the structural stress performance, enhances the durability of the node, overcomes the problem of difficult maintenance of cast-in-place UHPC, and because UHPC materials are only used on the outside of the node, the amount of materials used is saved and the cost is reduced.

[0006] Technical solution: To achieve the purpose of the present invention, the technical solution adopted by the present invention is: a prefabricated UHPC node component, including core area concrete, a UHPC layer wrapped around the core area concrete, a U-shaped groove, reserved holes and reserved steel bars on the node component;

[0007] The manufacturing method of the prefabricated UHPC node component is as follows: first, pour the core area concrete, after the core area concrete is poured and formed, first, put the lower side reserved steel bars into the mold, then put the core area concrete on the lower side reserved steel bars, and finally put the upper side reserved steel bars into the mold, then pour UHPC to form a UHPC layer and a U-shaped groove, and take out the steel bars in the mold to form a reserved hole;

[0008] Preferably, the core area concrete of the node member is made of ordinary concrete material and reserved holes are provided according to actual conditions. The reserved holes are consistent in size and position with the holes on the UHPC layer to facilitate the insertion of column longitudinal reinforcement.

[0009] The present invention proposes a method for connecting beams, columns and the node member, which adopts the following technical solution:

[0010] A method for connecting beams, columns and node components, characterized in that it comprises a prefabricated UHPC node component, a prefabricated concrete column, a prefabricated concrete beam, a mortar layer, a steel sleeve, and a cast-in-place ordinary concrete segment;

[0011] The precast concrete column and the precast UHPC node component are connected through a mortar layer, the precast concrete beam and the precast UHPC node component are connected through a common concrete post-casting section, the precast concrete lower column longitudinal reinforcement passes through the node component, the column longitudinal reinforcement is fixed in a steel sleeve located in the mortar layer, and the beam longitudinal reinforcement is connected to the reserved steel bars through a steel sleeve in the common concrete post-casting section.

[0012] Preferably, the precast UHPC node component is placed on the precast concrete lower column, and the column longitudinal reinforcement of the precast concrete lower column passes through the reserved holes in the node component. The length of the column longitudinal reinforcement of the precast concrete lower column is sufficient to pass through the reserved holes in the node component, and then the reserved holes and the mortar layer are poured in sequence.

[0013] Preferably, the longitudinal reinforcement in the precast concrete beam is connected to the reserved reinforcement in the precast UHPC node member through a reinforcement sleeve. When the precast concrete beam is connected to the precast UHPC node member through a post-cast ordinary concrete section, the side of the U-shaped groove in the node member and the side of the precast concrete beam are located in the same plane.

[0014] Preferably, the ends of the precast concrete column and the precast concrete beam are both provided with keyways and rough surfaces, and the surface of the precast UHPC node member is provided with a rough surface.

[0015] Beneficial effects: Compared with the prior art, the technical solution of the present invention has the following beneficial technical effects:

[0016] (1) The present invention avoids the difficulty of node casting and the difficulty of ensuring node quality caused by the congestion of steel bars at the nodes during construction by prefabricating the node components.

[0017] (2) Due to the superior performance of UHPC materials, only a small amount of UHPC materials is needed at the beam-column joints to meet the design requirements. However, the joints are constrained by the size of the beams and columns, and the volume of the joints cannot be reduced. Using all UHPC materials in the joint area will lead to material waste. The present invention uses a UHPC layer on the outside of the node, which effectively controls the amount of material used while giving full play to the ultra-high performance of UHPC, thereby saving costs and avoiding material waste.

[0018] (3) The restraining effect of the UHPC layer in the present invention on the internal core area concrete can improve the overall performance of the core area concrete, meet the requirements of strong nodes and weak components, and increase the durability of the structure.

[0019] (4) The prefabricated UHPC node components in the present invention are prefabricated in the factory and can be cured under high temperature and pressure, thereby giving full play to the excellent performance of UHPC.

[0020] (5) The U-shaped groove of the node component in the present invention is connected to the precast concrete beam through cast-in-place concrete, so that the plastic hinge on the beam is far away from the node area, thereby improving the seismic performance of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a prefabricated UHPC node component of the present invention;

[0022] Figure 2 A top view of a prefabricated UHPC node component of the present invention;

[0023] Figure 3 for Figure 2 AA schematic diagram;

[0024] Figure 4 It is a schematic diagram of the connection of beams, columns and node components in the present invention;

[0025] Figure 5 It is a schematic diagram of a prefabricated column of the present invention;

[0026] Figure 6 It is a schematic diagram of a prefabricated beam of the present invention;

[0027] Figure 7 It is a schematic diagram of the node component mold of the present invention.

[0028] In the figure: 1-precast UHPC node component, 11-UHPC layer, 12-core area concrete, 13-U-shaped groove, 14-reserved holes, 15-reserved steel bars, 2-precast concrete column, 201-precast concrete lower column, 202-precast concrete upper column, 21-column longitudinal reinforcement, 211-precast concrete lower column longitudinal reinforcement, 212-precast concrete upper column longitudinal reinforcement, 22-column stirrups, 3-precast concrete beam, 31-beam longitudinal reinforcement, 32-beam stirrups, 4-seating mortar layer, 5-steel sleeve, 6-ordinary concrete post-casting section, 7-node component mold, 71-steel plate with reserved steel bar holes, 72-steel rod, 73-stirrups, 74-U-shaped groove mold. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings:

[0030] The present invention proposes a prefabricated UHPC node component, such as Figure 1 The prefabricated UHPC node component 1 is composed of core area concrete 12, UHPC layer 11, reserved steel bars 15, reserved holes 14, and U-shaped grooves 13. The core area concrete 12 with reserved holes is prefabricated first, and then the reserved steel bars 15 are placed in the lower holes 71 of the node component mold 7, and the prepared core area concrete 12 is placed in the node component mold 7, and the reserved steel bars 15 are placed in the upper holes 71 of the node component mold 7, and then UHPC is poured, and high temperature and pressure curing are performed to make the prefabricated UHPC node component 1. The node component gives full play to the excellent performance of UHPC materials, enhances the seismic performance of the node, reduces the amount of steel bars in the node area, and reduces the difficulty of construction.

[0031] Figure 1 The prefabricated UHPC node component 1 is made by a node prefabricated mold 7; Figure 7 As shown, the mold consists of a steel plate 71 with reserved steel bar holes, a steel rod 72, stirrups 73 and a U-shaped groove mold 74; the reserved steel bars 15 of the prefabricated UHPC node component 1 pass through the steel plate 71 with reserved steel bar holes, the reserved holes 14 are made of the steel rod 72, and UHPC material is poured into the node component mold 7 and the U-shaped groove mold 74 to form the UHPC layer 11 and the U-shaped groove 13.

[0032] Furthermore, the U-shaped groove mold 74 of the node component mold 7 is internally connected to ensure that when the UHPC material is cast, the UHPC layer 11 of the prefabricated UHPC node component 1 is integrally connected with the U-shaped groove 13. When the structure is subjected to reciprocating loads, the U-shaped groove made of UHPC material moves the plastic hinge of the beam end outward, thereby improving the seismic resistance of the structure.

[0033] The present invention also proposes a prefabricated UHPC node component and a connection method, such as Figure 4The precast UHPC node component 1 is placed on the precast concrete lower column 201, the column longitudinal reinforcement 211 of the precast concrete lower column 201 passes through the reserved hole 14 in the node component 1 and is connected to the column longitudinal reinforcement 212 of the precast concrete upper column 202 through the steel sleeve 5, the precast UHPC node component 1 is connected to the precast concrete column 2 through the mortar layer 4, the beam longitudinal reinforcement 31 in the precast concrete beam 3 is connected to the reserved steel bar 15 in the precast UHPC node component 1 through the steel sleeve 5, and the precast concrete beam 3 is connected to the precast UHPC node component 1 through the post-cast ordinary concrete section 6. Using ultra-high performance UHPC materials in the form of precast node components in beam-column nodes with complex stresses can effectively improve the energy consumption capacity and durability of the frame.

[0034] Furthermore, the ends of the precast concrete column 2 and the ends of the precast concrete beam 3 are provided with keyways and rough surfaces, and the surface of the precast UHPC node component 1 is provided with a rough surface to enhance the interface bonding performance.

[0035] See also Figures 1 to 5 The construction method of the present invention comprises the following steps:

[0036] Step 1: According to the specific situation, the precast concrete column 2, the precast concrete beam 3, and the precast UHPC node component 1 are formed in the factory, cured, and then transported to the construction site;

[0037] Step 2: hoist the precast concrete lower column 201, place the precast node component 1 above the precast concrete lower column 201, and pass the column longitudinal reinforcement 211 of the precast concrete lower column 201 through the reserved hole in the node component;

[0038] Step 3: hoist the precast concrete upper column 202, connect the column longitudinal reinforcement 212 of the precast concrete upper column 202 with the column longitudinal reinforcement 211 of the precast concrete lower column through the steel sleeve 5, and then cast the steel sleeve 5, the node component reserved hole 14 and the mortar layer 4 between the node component 1 and the precast concrete upper and lower columns, and complete the connection between the node component and the column;

[0039] Step 4: hoist the precast concrete beam 3, connect the longitudinal reinforcement 31 in the precast concrete beam 3 with the reserved reinforcement 15 in the precast UHPC node component 1 through the reinforcement sleeve 5, and then cast the reinforcement sleeve 5 and the post-cast ordinary concrete section 6 between the precast concrete beam 3 and the precast UHPC node component 1 to complete the connection between the node component and the beam.

[0040] Step 5: Repeat steps 1 to 5 to complete the overall frame.

[0041] The above is only part of the implementation method of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A prefabricated UHPC node component, characterized in that: The prefabricated UHPC node component includes a UHPC layer, core area concrete, a U-shaped groove, a reserved hole and a reserved steel bar; the UHPC layer is wrapped around the outside of the core area concrete, the U-shaped groove is integrally connected to the UHPC layer, the reserved hole runs through the UHPC layer and the core area concrete, the reserved steel bar passes through the UHPC layer, and both ends of the reserved steel bar extend outward from the UHPC layer; The prefabricated UHPC node component is formed by a node component mold, and the node component mold includes a steel plate with reserved steel bar holes, a steel bar, stirrups, and a U-shaped groove mold; the U-shaped groove mold is internally connected to ensure that when the UHPC material is poured, the UHPC layer of the prefabricated UHPC node component is integrally connected with the U-shaped groove; The manufacturing method of the prefabricated UHPC node component is: firstly cast and shape the core area concrete, put the cast and shape core area concrete and reserved steel bars into a mold, and then cast UHPC to form a UHPC layer with reserved holes and a U-shaped groove.

2. A method for connecting prefabricated UHPC node components as claimed in claim 1, characterized in that: It includes a precast UHPC node component, a precast concrete column, a precast concrete beam, a mortar layer, a steel sleeve, a common concrete post-casting section, a precast concrete lower column longitudinal reinforcement, and a beam longitudinal reinforcement; the precast UHPC node component and the precast concrete column are connected through the mortar layer, the precast UHPC node component and the precast concrete beam are connected through the common concrete post-casting section, the precast concrete lower column longitudinal reinforcement passes through the node component, the column longitudinal reinforcement is fixed in the steel sleeve located in the mortar layer, and the beam longitudinal reinforcement is connected to the reserved steel bar through the steel sleeve in the common concrete post-casting section; After the precast UHPC node component is placed on the precast concrete lower column, the column longitudinal reinforcement of the precast concrete lower column passes through the reserved hole in the precast UHPC node component, and the length of the column longitudinal reinforcement of the precast concrete lower column is sufficient to pass through the reserved hole in the node component, and then the reserved hole and the mortar layer are poured between the precast UHPC node component and the precast concrete lower column; the beam longitudinal reinforcement in the precast concrete beam is connected to the reserved steel bars in the precast UHPC node component through a steel sleeve, and when the precast concrete beam and the precast UHPC node component are connected through a post-cast ordinary concrete section, the side of the U-shaped groove in the precast UHPC node component and the side of the precast concrete beam are located in the same plane; the ends of the precast concrete column and the precast concrete beam are both provided with keyways and rough surfaces, and the surface of the precast UHPC node component is provided with a rough surface.

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