Connection joint of prefabricated column and superposed beam, and method for constructing connection joint

Abstract

The present invention relates to the technical field of construction engineering. Disclosed are a connection joint of a prefabricated column and a superposed beam, and a method for constructing a connection joint. The connection joint of a prefabricated column and a superposed beam comprises a panel zone; a prefabricated column comprising a first prefabricated column and a second prefabricated column, wherein the first prefabricated column is vertically arranged at the top of the panel zone, and the second prefabricated column is vertically arranged at the bottom of the panel zone; and a splined sleeve assembly comprising height adjustment sleeves, a sleeve body and a fixing block, wherein the sleeve body is sleeved on the height adjustment sleeves, and the sleeve body is in threaded connection with the height adjustment sleeves. First vertical stressed steel bars can be connected to second vertical stressed steel bars by means of the splined sleeve assembly, and the height adjustment sleeves can be screwed to adjust the heights of the first vertical stressed steel bars to a small extent; and some of the height adjustment sleeves can be selectively screwed to adjust the heights of some of the first vertical stressed steel bars, thus improving the leveling accuracy of the upper and lower prefabricated columns during connection.

Description

A connection node between precast columns and composite beams and its construction method Technical Field

[0001] This invention relates to the field of building engineering technology, and in particular to a connection node between precast columns and composite beams and its construction method. Background Technology

[0002] The connection between precast columns and composite beams is a common beam-column joint type in precast concrete frame structures. In this connection, the steel bars between the precast columns are connected by grouting sleeves, and the steel bars of the precast beams are mechanically anchored to the cast-in-place concrete in the joint area. In order to ensure the rigidity and quality of the joint, the steel bars extending into the joint have high requirements. The joint generally has problems such as complex structure, dense steel bars that are prone to collision, difficult construction, and difficulty in ensuring connection quality.

[0003] Currently, to address issues such as complex structures and dense reinforcement that are prone to collisions, ordinary concrete at joints is being replaced with ultra-high performance concrete (UHPC), a new type of cement-based composite material. Its compressive strength is typically above 120 MPa, its toughness is more than 300 times that of ordinary concrete, its tensile strength can reach 10 MPa, and its elastic modulus is approximately 50–60 GPa (nearly twice that of ordinary concrete). In addition to possessing excellent mechanical properties (high strength, high toughness, impact resistance, etc.), it also exhibits superior bonding performance, fatigue resistance, and wear resistance. Therefore, it is possible to shorten the reinforcement anchorage length while ensuring the stiffness and quality of the joint.

[0004] However, the steel reinforcement connection between precast columns uses steel sleeves, and grout is injected into the steel sleeves for fixation. The upper and lower precast columns need to be leveled when connected. Currently, the leveling method is to set a vertical support rod at the center point between the upper and lower precast columns for support. The upper precast column is suspended by a machine, and construction personnel use equipment to survey and level using a crane. Both high-altitude winds and manual surveying can have an adverse effect on the leveling work. Therefore, this leveling method has low accuracy. Furthermore, since the steel reinforcement rods are directly poured into the joint after leveling, if too many steel reinforcement rods are set, they will occupy too much space in the joint, resulting in a reduction in the amount of concrete poured, which will affect the rigidity and quality of the joint. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the technical problem solved by this invention is: how to improve the connection performance and leveling accuracy of the upper and lower precast columns at the connection nodes of precast columns and composite beams using ultra-high performance concrete.

[0006] To achieve the above objectives, the present invention provides a connection node for precast columns and composite beams, comprising: a node domain; and a precast column, including a first precast column and a second precast column, wherein the first precast column is vertically disposed at the top of the node domain, and the second precast column is vertically disposed at the bottom of the node domain, wherein a first vertical reinforcing bar at the bottom of the first precast column and a second vertical reinforcing bar at the top of the second precast column are connected in a one-to-one correspondence, and the portions of the first and second vertical reinforcing bars exposed outside the precast columns are both located inside the node domain. The flower tube sleeve assembly is located inside the node area and includes a height adjusting sleeve, a sleeve body, and a fixing block. The sleeve body is fitted onto the height adjusting sleeve and is threadedly connected to the height adjusting sleeve. The adjusting sleeve is fitted onto the bottom of the first vertical reinforcing bar and the top of the second vertical reinforcing bar. The inner wall of the height adjusting sleeve is threadedly connected to the top of the second vertical reinforcing bar, and the top of the height adjusting sleeve abuts against the bottom of the first vertical reinforcing bar. The fixing block is engaged between the inner wall of the sleeve body and the outer wall of the first vertical reinforcing bar.

[0007] By adopting the above technical solution, when installing the first and second precast columns, the first and second vertical reinforcing bars are in one-to-one correspondence. A perforated sleeve assembly is installed between each set of the first and second vertical reinforcing bars. The perforated sleeve assembly can connect the first and second vertical reinforcing bars, and the height of the first vertical reinforcing bars can be adjusted slightly by screwing the height adjustment sleeve. Selectively, some of the height adjustment sleeves can be screwed to adjust the height of some of the first vertical reinforcing bars. Therefore, the leveling accuracy of the upper and lower precast columns during connection can be improved.

[0008] In one embodiment, the fixing block includes a first wedge-shaped fixing block and two second wedge-shaped fixing blocks. The cross-sectional circumference of the sleeve body and the cross-sectional circumference of the first vertical reinforcing bar form an annulus. The two second wedge-shaped fixing blocks are symmetrically arranged with respect to the diameter of the annulus, and the axis of symmetry of the first wedge-shaped fixing block coincides with the diameter of the annulus.

[0009] By adopting the above technical solution, the use of wedge-shaped fixing blocks can achieve the effect of temporary fixing of the first precast column, avoiding the need for temporary support during construction. Three wedge-shaped fixing blocks are snapped between the inner wall of the sleeve body and the outer wall of the first vertical reinforcing bar. The toothed surface of the wedge-shaped fixing blocks snaps into the threaded inner wall of the top of the sleeve body, thereby improving the stability of the snapping. Furthermore, through the design of the number and position of the wedge-shaped fixing blocks, the first vertical reinforcing bar can be subjected to more uniform force, thereby further improving the stability of the snapping.

[0010] In one embodiment, the sleeve body is provided with multiple grout inlet holes, and a screw-on hexagonal head is provided between the top end of the height adjusting sleeve and the bottom end of the first vertical reinforcing bar.

[0011] By adopting the above technical solution, the UHPC in the node domain can enter the sleeve body through the grout inlet hole, thereby realizing the connection between the longitudinal steel bars of the upper and lower columns, and further improving the rigidity and quality of the connection node; the hexagonal head can be screwed on to support the bottom surface of the first vertical reinforcing bar by adjusting the height of the sleeve.

[0012] In one embodiment, the node domain includes a formwork assembly that does not require removal, a reinforcing cage, and a node ultra-high performance concrete layer. The reinforcing cage is fitted around the perimeter formed by the outermost first vertical reinforcing bar and also around the perimeter formed by the outermost second vertical reinforcing bar. The formwork assembly that does not require removal is fitted onto the reinforcing cage, and the node ultra-high performance concrete layer is disposed inside the formwork assembly that does not require removal.

[0013] By adopting the above technical solution, a steel cage, i.e., stirrups inside the node region, is used to tie the first and second vertical reinforcing bars.

[0014] In one embodiment, the non-removable formwork assembly includes an L-shaped non-removable formwork and a connecting plate. The L-shaped non-removable formwork is arranged around the four corners of the reinforcing cage, and a connecting plate is provided between two adjacent L-shaped non-removable formworks.

[0015] By adopting the above technical solution, the template facilitates the adjustment of the dimensions of the connection nodes to be poured. The L-shaped non-removable template remains unchanged, and only the size of the connecting plate needs to be adjusted, thereby improving the applicability of the non-removable template component.

[0016] In one embodiment, the L-shaped non-removable template is provided with a first thin-walled steel plate and a second thin-walled steel plate. The first thin-walled steel plate and the second thin-walled steel plate are respectively provided with a first reinforcing bar hole and a second reinforcing bar hole. The bottom of the first vertical reinforcing bar is inserted through the first reinforcing bar hole, and the top of the second vertical reinforcing bar is inserted through the second reinforcing bar hole.

[0017] By adopting the above technical solution, the installation of the L-shaped non-removable formwork is facilitated. It is only necessary to insert the first vertical reinforcing bar into the first reinforcing bar hole and the second vertical reinforcing bar into the second reinforcing bar hole.

[0018] In one embodiment, the bottom four corners of the first precast column are provided with first slots, which are engaged with the top of the L-shaped non-removable template; the top four corners of the second precast column are provided with second slots, which are engaged with the bottom of the L-shaped non-removable template.

[0019] By adopting the above technical solution, the L-shaped removable template is set in the first slot and the second slot. Therefore, the top and bottom surfaces of the L-shaped removable template abut against the first precast column and the second precast column, respectively, thereby improving the stability of the L-shaped removable template installation.

[0020] In one embodiment, composite beams are provided on the sides of each node region, and the horizontal reinforcing bars of the composite beams are inserted inside the node region.

[0021] By adopting the above technical solution, the composite beam is connected to the precast column.

[0022] In one embodiment, the composite beam includes a precast beam and a concrete layer. The concrete layer is disposed on the top surface of the precast beam, and the beam stirrups inside the precast beam are disposed inside the concrete layer. The concrete layer includes a regular concrete layer and a beam ultra-high performance concrete layer. One end of the beam ultra-high performance concrete layer is connected to the node area, and the other end is connected to the regular concrete layer. A wire mesh is disposed between the regular concrete layer and the beam ultra-high performance concrete layer.

[0023] By adopting the above technical solution, the ultra-high performance concrete layer and the ordinary concrete layer of the beam are poured simultaneously. In order to avoid the concrete in the two areas mixing at adjacent places, which would cause damage to the quality of the formed building, the two areas are separated by steel wire mesh to prevent the two types of concrete from combining.

[0024] In one embodiment, the precast beam has a groove on the side near the node region, and a grooved ultra-high performance concrete layer is provided inside the groove.

[0025] By adopting the above technical solution, when pouring the ultra-high performance concrete layer at the node, since the node domain and the groove are connected, UHPC can flow into the groove. The ultra-high performance concrete layer in the groove and the ultra-high performance concrete layer at the node are integrally formed, thereby further improving the connection stiffness and integrity of the precast beam and the node.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The perforated sleeve assembly can connect the first and second vertical reinforcing bars, and the height of the first vertical reinforcing bar can be adjusted slightly by screwing the height adjustment sleeve. Furthermore, the height adjustment sleeve can be selectively screwed on a portion of the first vertical reinforcing bar to adjust its height, thus improving the leveling accuracy of the connection between the upper and lower precast columns; 2. Designing the formwork assembly as an L-shaped formwork and connecting plate enhances its applicability, and the L-shaped formwork is easy to install and fix due to its structure; 3. The entire node area, composite beam, and UHPC within the groove are integrally formed, further improving the rigidity and quality of the connection node; 4. The connection, leveling, and temporary fixing of the upper and lower precast columns can be achieved through the same structure, eliminating the need for vertical support rods for leveling and simplifying the arrangement of temporary supports during the construction of the first precast column. The formwork for the UHPC pouring at the node uses a formwork assembly that is easy to install, thereby reducing construction steps. Attached Figure Description

[0027] Figure 1 is a structural schematic diagram of the connection node between the precast column and the composite beam in an embodiment of the present invention; Figure 2 is a structural schematic diagram of the perforated tube sleeve assembly in an embodiment of the present invention; Figure 3 is a BB sectional view of Figure 2; Figure 4 is a structural schematic diagram of the wedge-shaped fixing block in an embodiment of the present invention; Figure 5 is an AA sectional view of Figure 1; Figure 6 is a structural schematic diagram of the L-shaped non-removable template in an embodiment of the present invention; Figure 7 is a structural schematic diagram of the M-shaped non-removable template in an embodiment of the present invention; Figure 8 is an unfolded view of the sleeve body in an embodiment of the present invention; Figure 9 is a second distribution diagram of the directional fibers in an embodiment of the present invention.

[0028] In the diagram: 1-Node area, 101-L-type removable formwork, 102-Reinforcing cage, 103-M-type removable formwork, 2-First precast column, 201-First vertical reinforcing bar, 202-First slot, 3-Second precast column, 301-Second vertical reinforcing bar, 302-Second slot, 4-Perforated pipe sleeve assembly, 401-Height adjusting sleeve, 402-Sleeve body, 403-Fixing block, 4031-First wedge-shaped fixing block 4032-Second wedge-shaped fixing block, 404-Grouting hole, 405-Turning hexagonal head, 406-Shear member, 5-Composite beam, 501-Precast beam, 5011-Beam stirrup, 5012-Groove, 502-Concrete layer, 5021-Ultra-high performance concrete layer of beam, 5022-Ordinary concrete layer, 6-Wire mesh, 7-First thin-walled steel plate, 8-Second thin-walled steel plate, 9-First rebar hole, 10-Second rebar hole. Detailed Implementation

[0029] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] The connection node between the precast column and the composite beam in this embodiment of the invention, as shown in Figures 1 and 2, includes a node domain 1 (the structure at the intersection of the column and the beam) and precast columns. The precast columns include a first precast column 2 and a second precast column 3. The first precast column 2 is vertically positioned at the top of the node domain 1, and the second precast column 3 is vertically positioned at the bottom of the node domain 1. A first vertical reinforcing bar 201 at the bottom of the first precast column 2 and a second vertical reinforcing bar 301 at the top of the second precast column 3 are connected in a one-to-one correspondence. This one-to-one correspondence includes, but is not limited to, correspondence in quantity and position. The portions of the first vertical reinforcing bar 201 and the second vertical reinforcing bar 301 exposed outside the precast column are all located inside the node domain 1. The part is provided with a perforated pipe sleeve assembly 4, which includes a height adjusting sleeve 401, a sleeve body 402 and a fixing block 403. The sleeve body 402 is sleeved on the height adjusting sleeve 401 and is threadedly connected to the height adjusting sleeve 401. The adjusting sleeve is sleeved on the bottom of the first vertical reinforcing bar 201 and the top of the second vertical reinforcing bar 301. The inner wall of the height adjusting sleeve 401 is threadedly connected to the top of the second vertical reinforcing bar 301. The top of the height adjusting sleeve 401 abuts against the bottom of the first vertical reinforcing bar 201. The fixing block 403 is engaged between the inner wall of the sleeve body 402 and the outer wall of the first vertical reinforcing bar 201.

[0031] It should be noted that the absence of mention of composite beam 5 in this structure does not mean that composite beam 5 is not present in the overall structure. Rather, due to the construction process, before the precast columns and composite beam 5 are combined, the upper and lower precast columns need to be connected and leveled, and this is done through the perforated pipe sleeve assembly 4. Therefore, in the above embodiment, in order to clearly describe the connection relationship between the perforated pipe sleeve assembly 4 and the upper and lower precast columns, composite beam 5 is not mentioned.

[0032] Therefore, it can be seen that when the first precast column 2 and the second precast column 3 are connected and installed, the first vertical reinforcing bar 201 and the second vertical reinforcing bar 301 are in one-to-one correspondence. A perforated pipe sleeve assembly 4 is installed between each group of the first vertical reinforcing bar 201 and the second vertical reinforcing bar 301. The perforated pipe sleeve assembly 4 can connect the first vertical reinforcing bar 201 and the second vertical reinforcing bar 301. The height of the first vertical reinforcing bar 201 can be adjusted slightly by turning the height adjustment sleeve 401. The height adjustment sleeve 401 can be turned selectively to adjust the height of part of the first vertical reinforcing bar 201. Therefore, the leveling accuracy of the upper and lower precast columns can be improved when they are connected.

[0033] Preferably, as shown in Figures 2, 3, and 4, the fixing block 403 includes a first wedge-shaped fixing block 4031 and two second wedge-shaped fixing blocks 4032. The cross-sectional circumference of the sleeve body 402 and the cross-sectional circumference of the first vertical reinforcing bar 201 form an annulus. The two second wedge-shaped fixing blocks 4032 are symmetrically arranged with respect to the diameter of the annulus. The axis of symmetry of the first wedge-shaped fixing block 4031 coincides with the diameter of the annulus.

[0034] Specifically, the wedge-shaped nylon block has a toothed surface, and the inner top wall of the sleeve body 402 needs to be designed as a threaded surface to improve the stability of the connection between the wedge-shaped nylon block and the sleeve body 402, thereby improving the stability between the inner wall of the sleeve body 402 and the outer wall of the first vertical reinforcing bar 201. There are various models of wedge-shaped nylon blocks suitable for different situations. When the axis of the first vertical reinforcing bar 201 coincides with the axis of the sleeve body 402, only one model of wedge-shaped nylon block needs to be used for fixing. In this case, the first wedge-shaped fixing block 4031 and the second wedge-shaped fixing block 4032 are of the same model. When the axis of the first vertical reinforcing bar 201 does not coincide with the axis of the sleeve body 402, it is necessary to use... Various types of wedge-shaped nylon blocks are used for fixing, with the first wedge-shaped fixing block 4031 and the second wedge-shaped fixing block 4032 being different models. The design of three wedge-shaped fixing blocks is more stable than two blocks, occupies less space than four blocks, and is easier to install. Regardless of whether the axis of the first vertical reinforcing bar 201 coincides with the axis of the sleeve body 402, the first vertical reinforcing bar 201 is subjected to more uniform force under the above design, thereby further improving the stability of the first vertical reinforcing bar 201 installed inside the sleeve body 402. The use of wedge-shaped fixing blocks can achieve the effect of temporary fixing of the first precast column, avoiding the need for temporary supports during construction.

[0035] Preferably, as shown in Figures 2, 3, and 7, the sleeve body 402 has multiple slurry inlet holes 404.

[0036] Specifically, under the premise of ensuring that the flower pipe sleeve assembly 4 has reliable force transmission, the number, size and arrangement of the grout inlet holes 404 can be adjusted according to the fluidity of the ultra-high performance concrete during the pouring of the node. The preferred arrangement is that they are evenly distributed on the sleeve body 402.

[0037] Preferably, as shown in Figure 2, a hexagonal head 405 is provided between the top end of the height adjusting sleeve 401 and the bottom end of the first vertical reinforcing bar 201, and the top surface of the hexagonal head 405 is convex.

[0038] Specifically, the hexagonal head 405 is fixedly connected to the height adjustment sleeve 401 at its bottom. The hexagonal head 405 is easy to rotate via the handle, thereby causing the height adjustment sleeve 401 to rotate. The top surface of the hexagonal head 405 is convex, which provides a better pushing effect than a flat surface. This is because if the first vertical reinforcing bar 201 is inserted obliquely into the sleeve body 402, that is, the bottom surface of the first vertical reinforcing bar 201 is inclined and the pushing surface is flat, there is a certain angle between the bottom surface of the first vertical reinforcing bar 201 and the pushing surface, meaning they cannot make complete contact, thus affecting the pushing effect. However, if the pushing surface is convex, the bottom surface of the first vertical reinforcing bar 201 is inclined and the contact surface with the pushing surface remains basically unchanged, and multi-directional pushing work can be performed.

[0039] Preferably, as shown in Figure 2, a plurality of shear members 406 are provided on the inner wall of the sleeve body 402.

[0040] Specifically, during concrete pouring, the concrete enters the interior of the sleeve body 402 through the grout inlet 404. After the UHPC hardens, it transmits the tensile force of the reinforcing steel through shear. To increase the shear area, multiple shear members 406 are designed to improve the force transmission performance of the perforated pipe sleeve.

[0041] Preferably, referring to Figures 1 and 5, a specific structure of node domain 1 is provided: Node domain 1 includes a formwork assembly that does not require removal, a reinforcing cage 102, and a node ultra-high performance concrete layer. The reinforcing cage 102 is fitted around the perimeter formed by the outermost first vertical reinforcing bar 201, and the reinforcing cage 102 is fitted around the perimeter formed by the outermost second vertical reinforcing bar 301. The reinforcing cage 102 includes multiple rings of column stirrups. A portion of the column stirrups are tied to the first vertical reinforcing bar 201, and the remaining portion of the column stirrups are tied to the second vertical reinforcing bar 301. The formwork assembly that does not require removal is fitted onto the reinforcing cage 102, and the node ultra-high performance concrete layer is disposed inside the formwork assembly that does not require removal.

[0042] Specifically, the first vertical reinforcing bar 201 and the second vertical reinforcing bar 301 are tied together by the column stirrups, and the formwork assembly is placed on the first vertical reinforcing bar 201 and the second vertical reinforcing bar 301. The formwork assembly, column stirrups, first vertical reinforcing bar 201, second vertical reinforcing bar 301 and joint ultra-high performance concrete are integrated into one unit.

[0043] Furthermore, a specific structure of a non-removable formwork assembly is provided: The non-removable formwork assembly includes an L-shaped non-removable formwork 101 and connecting plates. The L-shaped non-removable formwork 101 is arranged around the four corners of the reinforcing cage 102, and a connecting plate is provided between two adjacent L-shaped non-removable formwork 101s.

[0044] Specifically, four L-shaped removable formwork panels 101 are installed at the four corners of the reinforcing cage 102. Then, appropriate connecting plates are selected and installed according to the dimensions between two adjacent L-shaped removable formwork panels 101 to form a removable formwork assembly. The L-shaped removable formwork panels 101 and the connecting plates are both made of UHPC. Therefore, after the joint is integrally formed, the formwork does not need to be removed, and the rigidity and quality of the joint can be guaranteed.

[0045] Furthermore, as shown in Figure 6, the L-shaped non-removable template 101 is provided with a first thin-walled steel plate 7 and a second thin-walled steel plate 8. The first thin-walled steel plate 7 and the second thin-walled steel plate 8 are respectively provided with a first rebar hole 9 and a second rebar hole 10. The bottom of the first vertical reinforcing bar 201 is inserted through the first rebar hole 9, and the top of the second vertical reinforcing bar 301 is inserted through the second rebar hole 10.

[0046] Preferably, referring to Figure 7, another specific structure of the non-removable formwork assembly is provided: The non-removable formwork assembly includes an M-shaped non-removable formwork 103. An M-shaped non-removable formwork 103 is provided between two adjacent precast beams 501. One end of the M-shaped non-removable formwork 103 is fixedly connected to one of the precast beams 501, and the other end of the M-shaped non-removable formwork 103 is fixedly connected to the other precast beam 501. The end faces of the four M-shaped non-removable formworks 103 and the four precast beams 501 form a node area 1. The M-shaped non-removable formwork 103 is made of thin-walled steel formwork, and the thickness of the thin-walled steel formwork is 1 to 3 mm.

[0047] Preferably, as shown in Figure 1, the bottom corners of the first precast column 2 are provided with first slots 202, which are engaged with the top of the L-shaped non-removable template 101. The top corners of the second precast column 3 are provided with second slots 302, which are engaged with the bottom of the L-shaped non-removable template 101.

[0048] Specifically, the L-shaped removable template 101 is placed in the first slot 202 and the second slot 302, so that the top and bottom surfaces of the L-shaped removable template 101 abut against the first precast column 2 and the second precast column 3, respectively.

[0049] Preferably, as shown in Figures 1 and 5, composite beams 5 are provided on the sides of the node domain 1, and the horizontal reinforcing bars of the composite beams 5 are inserted into the interior of the node domain 1.

[0050] Specifically, the side of node domain 1 has four sides, and each side is provided with a composite beam 5. The horizontal reinforcing bars of the composite beam 5 should avoid the vertical reinforcing bars of the precast column and the reinforcing bars of the reinforcing cage 102.

[0051] Furthermore, referring to Figure 1, a specific structure of a composite beam 5 is provided: The composite beam 5 includes a precast beam 501 and a concrete layer 502. The concrete layer 502 is disposed on the top surface of the precast beam 501. The beam stirrups 5011 inside the precast beam 501 are inserted into the interior of the concrete layer 502. The concrete layer 502 includes a regular concrete layer 5022 and a beam ultra-high performance concrete layer 5021. One end of the beam ultra-high performance concrete layer 5021 is connected to the node domain 1, and the other end is connected to the regular concrete layer 5022. A wire mesh 6 is provided between the regular concrete layer 5022 and the beam ultra-high performance concrete layer 5021.

[0052] Specifically, the precast beam 501 is first combined with node 1. The stirrups 5011 of the precast beam 501 are exposed on the top surface of the precast beam 501. The top surface of the precast beam 501 is divided into two areas. Ordinary concrete is poured in the area away from node 1, and ultra-high performance concrete is poured together with node 1 in the area close to node 1 to form a whole. The two areas are separated by a wire mesh 6 to prevent the two types of concrete from mixing during pouring.

[0053] Furthermore, as shown in Figures 1 and 5, a groove 5012 is provided on the side of the precast beam 501 near node 1, and a grooved ultra-high performance concrete layer is provided inside the groove 5012.

[0054] Specifically, when pouring the ultra-high performance concrete layer of the node, since the node domain 1 and the groove 5012 are connected, UHPC can flow into the interior of the groove 5012. The ultra-high performance concrete layer of the groove and the ultra-high performance concrete layer of the node are integrally formed, thereby further improving the connection stiffness and quality between the precast beam 501 and the node.

[0055] The construction method for the connection node of the precast column and composite beam in this embodiment of the invention includes the following steps: fixing the second precast column 3; simultaneously passing the non-removable formwork assembly and the reinforcing cage 102 through the second vertical reinforcing bar 301 exposed on the top surface of the second precast column 3, and placing them on the top surface of the second precast column 3; threading the height adjusting sleeve 401 to the top of the second vertical reinforcing bar 301, and threading the sleeve body 402 onto the height adjusting sleeve 401; Install the first precast column 2, wherein the first vertical reinforcing bar 201 exposed on the bottom surface of the first precast column 2 passes through the non-removable formwork assembly and the reinforcing cage 102. The first vertical reinforcing bar 201 and the second vertical reinforcing bar 301 correspond one-to-one. Insert the first vertical reinforcing bar 201 into the sleeve body 402 until it abuts against the height adjusting sleeve 401. Move the sleeve body 402 upward and screw the height adjusting sleeve 401 until the first precast column 2 is leveled. Move the sleeve body 402 downward and screw it onto the height adjusting sleeve 401. Embed the fixing block 403 between the inner wall of the sleeve body 402 and the outer wall of the first vertical reinforcing bar 201. Erect a temporary support for the composite beam 5, install the precast beam 501 on the temporary support, and erect the formwork for the post-cast strip of the composite beam. Divide the top surface of the precast beam 501 into a first area adjacent to the node area 1 and a region away from the node area 1 by using a wire mesh 6. In the second region, UHPC is poured in node domain 1 and the first region, and ordinary concrete is poured in the second region. After thorough vibration, it is cured.

[0056] Specifically, the UHPC within the entire node domain 1, composite beam 5, and groove 5012 is integrally molded, further enhancing the rigidity and quality of the connection node. Furthermore, the connection and leveling of the upper and lower precast columns can be achieved through the same structure, eliminating the need to erect steel reinforcement rods for leveling. The formwork for pouring the UHPC at the node adopts a non-removable formwork assembly, thereby reducing construction steps. That is, there is no need to erect steel reinforcement rods for leveling or to remove the concrete pouring formwork, while ensuring the rigidity and quality of the node.

[0057] Preferably, as shown in Figure 9, the UHPC cast in node domain 1 is a mixed oriented fiber UHPC, with the fiber directions being mutually orthogonal vertical and horizontal directions in the horizontal plane.

[0058] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A connection node between a precast column and a composite beam, characterized in that, It includes: Node field (1); The precast column includes a first precast column (2) and a second precast column (3). The first precast column (2) is vertically set at the top of the node domain (1), and the second precast column (3) is vertically set at the bottom of the node domain (1). The first vertical reinforcing bar (201) at the bottom of the first precast column (2) and the second vertical reinforcing bar (301) at the top of the second precast column (3) are connected one-to-one. The exposed parts of the first vertical reinforcing bar (201) and the second vertical reinforcing bar (301) are both located inside the node domain (1). The flower tube sleeve assembly (4) is located inside the node domain (1). It includes a height adjusting sleeve (401), a sleeve body (402), and a fixing block (403). The sleeve body (402) is sleeved on the height adjusting sleeve (401), and the sleeve body (402) is threadedly connected to the height adjusting sleeve (401). The adjusting sleeve is sleeved at the bottom of the first vertical reinforcing bar (201) and the top of the second vertical reinforcing bar (301). The inner wall of the height adjusting sleeve (401) is threadedly connected to the top of the second vertical reinforcing bar (301). The top of the height adjusting sleeve (401) abuts against the bottom of the first vertical reinforcing bar (201). The fixing block (403) is engaged between the inner wall of the sleeve body (402) and the outer wall of the first vertical reinforcing bar (201).

2. The connection node between the precast column and the composite beam as described in claim 1, characterized in that: The fixing block (403) includes a first wedge-shaped fixing block (4031) and two second wedge-shaped fixing blocks (4032). The cross-sectional circumference of the sleeve body (402) and the cross-sectional circumference of the first vertical reinforcing bar (201) form an annulus. The two second wedge-shaped fixing blocks (4032) are symmetrically arranged with respect to the diameter of the annulus. The axis of symmetry of the first wedge-shaped fixing block (4031) coincides with the diameter of the annulus.

3. The connection node between the precast column and the composite beam as described in claim 1, characterized in that: The sleeve body (402) is provided with multiple grout inlet holes (404), and a screw-on hexagonal head (405) is provided between the top end of the height adjustment sleeve (401) and the bottom end of the first vertical reinforcing bar (201).

4. The connection node between the precast column and the composite beam as described in claim 1, characterized in that: The node domain (1) includes a formwork assembly that does not require dismantling, a reinforcing cage (102), and a node ultra-high performance concrete layer. The reinforcing cage (102) is fitted around the perimeter formed by the outermost first vertical reinforcing bar (201) and the reinforcing cage (102) is fitted around the perimeter formed by the outermost second vertical reinforcing bar (301). The formwork assembly that does not require dismantling is fitted onto the reinforcing cage (102), and the node ultra-high performance concrete layer is located inside the formwork assembly that does not require dismantling.

5. The connection node between the precast column and the composite beam as described in claim 4, characterized in that: The non-removable formwork assembly includes an L-shaped non-removable formwork (101) and a connecting plate. The L-shaped non-removable formwork (101) is arranged around the four corners of the steel cage (102), and a connecting plate is provided between two adjacent L-shaped non-removable formworks (101).

6. The connection node between precast columns and composite beams as described in claim 5 and its construction method, characterized in that: The L-shaped non-removable template (101) is provided with a first thin-walled steel plate (7) and a second thin-walled steel plate (8). The first thin-walled steel plate (7) and the second thin-walled steel plate (8) are respectively provided with a first reinforcing bar hole (9) and a second reinforcing bar hole (10). The bottom of the first vertical reinforcing bar (201) is inserted through the first reinforcing bar hole (9), and the top of the second vertical reinforcing bar (301) is inserted through the second reinforcing bar hole (10).

7. The connection node between the precast column and the composite beam as described in claim 6, characterized in that: The first precast column (2) has a first slot (202) at the four corners of its bottom end, and the first slot (202) is engaged with the top of the L-shaped non-removable template (101). The second precast column (3) has a second slot (302) at the four corners of its top end, and the second slot (302) is engaged with the bottom of the L-shaped non-removable template (101).

8. The connection node between the precast column and the composite beam as described in claim 1, characterized in that: Each side of the node region (1) is provided with a composite beam (5), and the horizontal reinforcing bars of the composite beam (5) are inserted inside the node region (1).

9. The connection node between the precast column and the composite beam as described in claim 8, characterized in that: The composite beam (5) includes a precast beam (501) and a concrete layer (502). The concrete layer (502) is located on the top surface of the precast beam (501). The beam stirrups (5011) inside the precast beam (501) are inserted into the interior of the concrete layer (502). The concrete layer (502) includes an ordinary concrete layer (5022) and a beam ultra-high performance concrete layer (5021). One end of the beam ultra-high performance concrete layer (5021) is connected to the node domain (1), and the other end is connected to the ordinary concrete layer (5022). A wire mesh (6) is provided between the ordinary concrete layer (5022) and the beam ultra-high performance concrete layer (5021).

10. The connection node between the precast column and the composite beam as described in claim 9, characterized in that: The precast beam (501) has a groove (5012) on the side near the node domain (1), and the groove (5012) is provided with a groove ultra-high performance concrete layer.

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