A concrete modular stacking frame structure bidirectional connecting joint and construction method

Abstract

The application discloses a concrete modular stacking frame structure bidirectional connecting node and a construction method, belongs to the technical field of concrete module construction, and realizes column-column connection between modules and the integration between upper modules and lower modules after pouring is completed. The connecting mode can effectively transfer internal forces such as bending moment, shear force and axial force. Horizontal modules are transversely connected through a steel plate frame, and the left and right steel pipe inner core tubes arranged side by side are horizontally connected through the steel plate frame, so that the node area load can be effectively transferred. The structure is connected through vertical column-column connection and transverse steel plate frame connection, the connection strength and stiffness of the node position are strengthened, the stability of the overall structure is enhanced, and the breakthrough of stacking concrete modular buildings from low floors to high floors can be realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of concrete module construction, and in particular relates to a two-way connection node of a concrete modular stacking frame structure and a construction method. Background Art

[0002] Concrete stacking modular construction is an innovative construction method that breaks down buildings into independent modular units that are mostly assembled in factories. Figure 1 As shown in FIG, a common concrete stacking module structure is a stacking structure of several frame-shaped module structures. At present, the vertical connections between concrete modules mainly include dry connections such as bolt connections and tie rod connections or local wet connections such as sleeve grouting and grout anchor overlap. The horizontal connections mainly use connecting steel plates.

[0003] However, according to relevant test experience, tie rod and bolt connections are generally hinged or semi-rigid, which are weak and result in poor overall structural performance. While sleeve grouting, grout-anchor lap joints, or mechanical steel bar connections can achieve rigid connections, the simultaneous assembly of the four corner columns in a modular structure requires higher construction precision for steel bar connections. Furthermore, the common location of horizontal connecting steel plates at the column ends weakens the horizontal connection at the core of the joint. Therefore, the present invention proposes a bidirectional connection node for a concrete modular stacked frame structure. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a two-way connection node and construction method for a concrete modular stacking frame structure, in which the vertical connection is connected by grouting of a steel pipe core tube, and the horizontal connection is connected by a column end steel plate. The two-way connection can meet the requirements of a rigid node.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention includes two square lower modules and two square upper modules. The top surface of the corner column position of the lower module is pre-embedded with a steel pipe inner core tube, and the bottom surface of the upper module corner column position is pre-opened with a square cavity inward. It also includes a steel plate frame, and the steel plate frame has two openings that match the steel pipe inner core tube. After the two square lower modules are arranged side by side, the steel plate frame is respectively inserted into the two steel pipe inner core tubes to fix the distance between the two steel pipe inner core tubes. The outer side of the upper module is also provided with a casting hole that penetrates into the square cavity. The square cavity is inserted into the steel pipe inner core tube, so that the two upper modules are stacked side by side on the top surfaces of the two lower modules.

[0007] The top end of the support frame is fixed with the guide rail, and the bottom end of the support rail is fixed with the guide rail. The guide rail is fixed with the guide rail inside the steel pipe core tube, and the guide rail is provided with a guide hole. The connecting column is vertically slid onto the guide plate, and the baffle is fixed on the bottom end of the connecting column. The baffle has a through hole with an outer diameter larger than the threaded column. A circle of baffles is fixed on the middle section of the threaded column. The baffle is located above the baffle, and the threaded column passes through the through hole. Before placing the upper module, the support plate is exposed from above the inner core tube of the steel pipe under the support of the threaded column, used to support the lowered upper module. When the threaded column is moved downward, the upper module gradually contacts and stacks with the lower module.

[0008] Furthermore, a buffer spring is supported between the baffle and the lower module.

[0009] Furthermore, the steel plate frame includes two steel plate panels, the openings are respectively opened on the two steel plate panels, a vertical plate is upwardly arranged on one side of the steel plate panel, a through horizontal groove is opened on the vertical plate, and also includes a plurality of locking studs, the tail ends of the locking studs are spherical structures, the locking studs respectively pass through the horizontal grooves on the two vertical plates, the locking studs are threadedly connected to nuts, and the spherical structure of the nuts and the locking studs clamps the two vertical plates.

[0010] Furthermore, the relative surfaces of the two lower modules are inwardly provided with recesses and are threadedly connected with a number of ring studs. When the two lower modules are spliced ​​together, the ring studs on both sides are staggered and also include an insert, which is inserted into the rings of all the ring studs at the same time.

[0011] Furthermore, the steel tube inner core tube is provided with a plurality of grouting holes on the exposed side wall of the lower module for pouring concrete and serving as concrete shear keys.

[0012] The present invention also provides a bidirectional connection construction method for a concrete modular stacking frame structure, comprising the following steps:

[0013] S1. Prefabricate the lower module, embed the inner core of the steel pipe in the lower module, set a recess on the opposite side of the lower module and embed several studs with rings;

[0014] S2, prefabricate the upper module and open a square cavity on the bottom side of the upper module;

[0015] S3. Place the lower modules to be built side by side, align them, and insert the dowels into all the studs with rings;

[0016] S4. Insert the steel plate frame and stack the two upper modules side by side on top of the lower module;

[0017] S5. Rotate the threaded column so that the support plate of the connecting column is supported on the inner side of the square cavity of the upper module. Rotate the threaded column to align the upper module and lower the upper module.

[0018] S6. Pour concrete from the pouring hole until the concrete is full.

[0019] The beneficial effects of the present invention are:

[0020] In the present invention, the upper module and the lower module are pre-buried in the top of the unit column of the lower module through the steel tube inner core tube, and the upper module is connected to the exposed steel tube inner core tube through the square cavity. After the casting is completed, the column-to-column connection between the modules is realized, and the upper module and the lower module are integrated. This connection method can effectively transmit internal forces such as bending moment, shear force and axial force; and the horizontal connection between the horizontal modules is realized by the steel plate frame, and the left and right steel tube inner core tubes are horizontally connected by the steel plate frame, which can effectively transmit the node area load; this structure strengthens the connection strength and rigidity of the node position through the vertical column-to-column connection and the horizontal steel plate frame column connection, enhances the stability of the overall structure, and can achieve a breakthrough from low-rise to high-rise stacked concrete modular buildings; compared with the traditional steel bar grouting sleeve connection, the steel tube inner core tube grouting construction is more convenient, simplifies the construction process, speeds up the construction progress, and saves construction costs.

[0021] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0023] Figure 1 This is a schematic diagram of a modular concrete stacking structure according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of connection nodes according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of a module according to an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the modules after splicing according to an embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the steel plate frame structure according to an embodiment of the present invention;

[0028] Figure 6This is a schematic diagram of module stacking in an embodiment of the present invention;

[0029] Figure 7 A cross-sectional view of a connection node according to an embodiment of the present invention;

[0030] The markings in the accompanying drawings are as follows: 1. Lower module; 2. Upper module; 21. Square cavity; 22. Casting hole; 3. Inner core tube of steel pipe; 31. Grouting hole; 4. Steel plate frame; 41. Steel plate plate; 411. Opening; 42. Vertical plate; 421. Horizontal groove; 43. Locking stud; 44. Nut; 5. Auxiliary support frame; 51. Threaded column; 511. Baffle; 52. Support plate; 53. Connecting column; 54. Baffle; 541. Through hole; 55. Guide plate; 56. Buffer spring; 61. Stud with ring; 62. Dowel. DETAILED DESCRIPTION

[0031] like Figures 1 to 7 As shown, the present invention discloses a concrete modular stacking frame structure bidirectional connection node, referring to Figure 1 The concrete modular stacking frame structure is composed of a number of square frame structures arranged in sequence and overlapped. The connection nodes disclosed in the present invention are located at the corner columns of the frame of the stacking structure. Figure 2 , including two square lower modules 1 and two square upper modules 2. Through this connection node, all concrete modules are connected. The detailed structure of this connection node is as follows. Figure 3 The top surface of the corner column of the lower module 1 is pre-buried with a steel tube inner core 3, which is a square column structure that runs through the top and bottom. Figure 7 The upper module 2 is provided with a square cavity 21 in the bottom surface of the corner column position. The internal cross-section of the square cavity 21 is larger than the cross-section of the steel tube core 3. The upper module 2 also includes a steel plate frame 4. Figure 5 and Figure 6 As shown, the steel plate frame 4 is provided with two openings 411 which cooperate with the steel tube inner core tube 3. After the two square lower modules 1 are arranged side by side, the steel plate frame 4 is respectively inserted into the two steel tube inner core tubes 3 to fix the distance between the two steel tube inner core tubes 3. The outer side of the upper module 2 is also provided with a casting hole 22 which penetrates into the square cavity 21. The square cavity 21 is inserted into the steel tube inner core tube 3, so that the two upper modules 2 are stacked side by side on the top surfaces of the two lower modules 1. After the four modules are connected and stacked, concrete is poured from the casting hole 22. After the concrete solidifies, the connection of the four modules is realized.

[0032] In this connection node, the upper module 2 and the lower module 1 are pre-buried in the column top of the lower module 1 unit through the steel tube inner core tube 3, and the upper module 2 is connected to the exposed steel tube inner core tube 3 through the square cavity 21. After the pouring is completed, the column-to-column connection between the modules is realized, and the upper module 2 and the lower module 1 are integrated. This connection method can effectively transmit internal forces such as bending moment, shear force and axial force; and the horizontal connection between the horizontal modules is realized through the steel plate frame 4, and the left and right steel tube inner core tubes 3 are horizontally connected by the steel plate frame 4, which can effectively transmit the node area load; this structure is connected through the vertical column-to-column connection in conjunction with the horizontal steel plate frame 4, which strengthens the connection strength and rigidity of the node position, enhances the stability of the overall structure, and can achieve a breakthrough from low-rise to high-rise stacked concrete modular buildings; compared with the traditional steel bar grouting sleeve connection, the grouting construction of the steel tube inner core tube 3 is more convenient, simplifies the construction process, speeds up the construction progress, and saves construction costs.

[0033] In a further solution, Figure 3 and Figure 7 As shown, it also includes an auxiliary support frame 5, which includes a threaded column 51, a support plate 52, a connecting column 53, a baffle 54 and a guide plate 55. The threaded column 51 is threadedly connected to the top surface of the lower module 1, and the threaded column 51 is located on the inner side of the steel pipe inner core tube 3. By drilling a hole at the connection position and pre-installing the threaded cylinder, the threaded column 51 is connected to the top surface of the lower module 1, wherein the top of the threaded column 51 is exposed from the casting hole 22; the support plate 52 is a flat plate structure, and the bottom side is fixedly connected to the connecting column 53, and the guide plate 55 is fixed on the inner side of the steel pipe inner core tube 3. The guide plate 55 has a guide hole. The connecting column 53 is vertically slid on the guide plate 55, and the baffle 54 is fixed at the bottom end of the connecting column 53. A through hole 541 with an outer diameter larger than that of the threaded column 51 is opened on the baffle 54. A circle of baffle 511 is fixed on the middle section of the threaded column 51. The baffle 54 is located above the baffle 511. The threaded column 51 passes through the through hole 541. Before placing the upper module 2, the support plate 52 is supported by the threaded column 51 and exposed from above the inner core tube 3 of the steel pipe to support the lowered upper module 2. The threaded column 51 is moved downward, and the upper module 2 gradually contacts and stacks with the lower module 1.

[0034] This structure, by adding an auxiliary support frame 5, when stacking the upper module 2, the top surface of the square cavity 21 inside the upper module 2 first contacts the support plate 52. At this time, the upper module 2 is supported by the support plate 52 and suspended above the lower module 1. By rotating the threaded column 51, the support plate 52 is slowly lowered to drive the upper module 2 to slowly descend. During the slow descent of the upper module 2, it is convenient to adjust the alignment position of the upper module 2 and the lower module 1 to avoid the problem of a larger contact surface and greater friction caused by direct contact between the upper module 2 and the lower module 1, which may damage components during the assembly and correction process, overcome the problem of difficulty in moving the upper module 2, improve the alignment accuracy of the upper module 2 and the lower module 1, and reduce the difficulty of alignment.

[0035] In a further solution, Figure 3 and Figure 7 As shown, a buffer spring 56 is also supported between the baffle 54 and the lower module 1. By providing the buffer spring 56, when the upper module 2 contacts the support plate 52, hard contact between the upper module 2 and the support plate 52 is avoided, and a buffer is provided for the placement of the upper module 2 to avoid damage to the corners of the upper module 2 due to bumps during the placement process.

[0036] In a further solution, Figure 5 and Figure 6 As shown, the steel plate frame 4 includes two steel plate panels 41, the openings 411 are respectively opened on the two steel plate panels 41, a vertical plate 42 is upwardly arranged on one side of the steel plate panel 41, and a through transverse groove 421 is opened on the vertical plate 42. It also includes three locking studs 43, and the tail end of the locking stud 43 is a spherical structure. The locking studs 43 pass through the transverse grooves 421 on the two vertical plates 42 respectively. The locking studs 43 are threadedly connected to the nuts 44, and the spherical structure of the nuts 44 and the locking studs 43 clamps the two vertical plates 42.

[0037] The steel plate frame 4 of this structure can be fixed by locking the connecting nut 44 after the lower module 1 is accurately docked. The locking stud 43 of the spherical structure can be displaced and deflected to a certain extent in the transverse groove 421. With the fixation of the nut 44, the distance between the two steel plate sections 41 is fixed. This structure can overcome the position offset problem that occurs when the steel pipe inner core tube 3 is pre-installed, ensuring that the splicing alignment between the lower modules 1 is not affected by the steel plate frame 4, and realizing the connection and fixation of the two steel pipe inner core tubes 3 by the steel plate frame 4, thereby ensuring the lateral rigid connection between the two steel pipe inner core tubes 3.

[0038] In a further solution, Figure 3 and Figure 4As shown, the opposite surfaces of the two lower modules 1 are provided with recesses inward and are threadedly connected with a number of ring studs 61. When the two lower modules 1 are spliced ​​together, the ring studs 61 on both sides are staggered and also include a dowel 62. The dowel 62 is inserted into the rings of all the ring studs 61 at the same time.

[0039] This structure connects the horizontal ring studs 61 in the left and right modules in series through vertical dowels 62 in the core area of ​​the connection node. After pouring concrete, this core area of ​​the node forms a whole, which can effectively transfer regional loads. This connection method is a second structure that jointly resists horizontal external loads, further improving the seismic performance of the overall structure.

[0040] In a further solution, the steel tube inner core tube 3 is provided with a plurality of grouting holes 31 on the exposed side wall of the lower module 1 for the flow of poured concrete. By opening the grouting holes 31, the poured concrete is facilitated to quickly fill and fill the directional cavity of the upper module 2, thereby ensuring the integrity of the connection node after the filling is completed. At the same time, the concrete in the hole forms a shear key, thereby enhancing the embedding performance between the inner core tube and the concrete.

[0041] The present invention also discloses a bidirectional connection construction method for a concrete modular stacking frame structure, which comprises the following steps:

[0042] S1. Prefabricate the lower module 1, embed the steel tube inner core 3 in the lower module 1, set a recess on the opposite side of the lower module 1 and embed several ring studs 61;

[0043] S2, prefabricate the upper module 2, and open a square cavity 21 on the bottom side of the upper module 2;

[0044] S3, place the lower modules 1 to be assembled side by side, align them, and insert the dowels 62 into all the ring studs 61;

[0045] S4, insert the steel plate frame 4, and then stack the two upper modules 2 side by side on the top side of the lower module 1;

[0046] S5. Rotate the threaded column 51 so that the support plate 52 supported by the connecting column 53 is supported on the inner side of the square cavity 21 of the upper module 2. Rotate the threaded column 51 to align the upper module 2 and lower the upper module 2.

[0047] S6. Pour concrete from the pouring hole 22 until the concrete is full.

[0048] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A concrete modular stacking frame structure bidirectional connection node, comprising two square lower modules (1) and two square upper modules (2), characterized in that: The top surface of the corner column position of the lower module (1) is pre-buried with a steel pipe inner core tube (3), and the bottom surface of the corner column position of the upper module (2) is pre-opened with a square cavity (21) inwardly, and also includes a steel plate frame (4), and the steel plate frame (4) is provided with two openings (411) that match the steel pipe inner core tube (3). After the two square lower modules (1) are arranged side by side, the steel plate frame (4) is respectively inserted into the two steel pipe inner core tubes (3) so that the distance between the two steel pipe inner core tubes (3) is fixed. The outer side of the upper module (2) is also provided with a casting hole ( 22), the square cavity (21) is inserted into the steel tube inner core (3), so that the two upper modules (2) are stacked side by side on the top surfaces of the two lower modules (1); it also includes an auxiliary support frame (5), the auxiliary support frame (5) includes a threaded column (51), a support plate (52), a connecting column (53), a baffle (54) and a guide plate (55), the threaded column (51) is threadedly connected to the top surface of the lower module (1), the threaded column (51) is located on the inner side of the steel tube inner core (3), the bottom side of the support plate (52) is fixedly connected to the connecting column (53), the guide plate (55 ) is fixed on the inner side of the steel tube core tube (3), the guide plate (55) is provided with a guide hole, the connecting column (53) is vertically slid on the guide plate (55), the baffle (54) is fixed to the bottom end of the connecting column (53), a through hole (541) with an outer diameter larger than that of the threaded column (51) is provided on the baffle (54), a circle of baffles (511) is fixed in the middle section of the threaded column (51), the baffle (54) is located above the baffle (511), the threaded column (51) passes through the through hole (541), and before the upper module (2) is placed, the support plate (52) is exposed from above the inner core tube (3) of the steel pipe under the support of the threaded column (51) and is used to support the lowered upper module (2). When the threaded column (51) is moved downward, the upper module (2) gradually contacts and stacks with the lower module (1); the opposite surfaces of the two lower modules (1) are provided with recesses inward and are threadedly connected with a plurality of ring studs (61). When the two lower modules (1) are spliced ​​together, the ring studs (61) on both sides are staggered and also include a dowel (62). The dowel (62) is inserted into the rings of all the ring studs (61) at the same time.

2. A concrete modular stacking frame structure bidirectional connection node according to claim 1, characterized in that: A buffer spring (56) is also supported between the baffle (54) and the lower module (1).

3. The concrete modular stacking frame structure bidirectional connection node according to claim 1, characterized in that: The steel plate frame (4) includes two steel plate panels (41), the openings (411) are respectively opened on the two steel plate panels (41), a vertical plate (42) is upwardly arranged on one side of the steel plate panel (41), and a through transverse groove (421) is opened on the vertical plate (42), and also includes a plurality of locking studs (43), the tail ends of the locking studs (43) are spherical structures, the locking studs (43) respectively pass through the transverse grooves (421) on the two vertical plates (42), the locking studs (43) are threadedly connected to nuts (44), and the spherical structures of the nuts (44) and the locking studs (43) clamp the two vertical plates (42).

4. The concrete modular stacking frame structure bidirectional connection node according to claim 1, characterized in that: The steel tube inner core (3) is provided with a plurality of grouting holes (31) on the side wall of the exposed portion of the lower module (1) for pouring concrete and forming concrete shear keys.

5. A method for constructing a bidirectional connection of a concrete modular stacking frame structure, applicable to a bidirectional connection node of a concrete modular stacking frame structure according to any one of claims 1 to 4, comprising the following steps: S1, prefabricate the lower module (1), embed the steel tube inner core (3) in the lower module (1), set a recess on the opposite side of the lower module (1) and embed a plurality of ring studs (61); S2, prefabricating an upper module (2), and opening a square cavity (21) on the bottom side of the upper module (2); S3, placing the lower modules (1) to be built side by side, aligning them, and inserting the dowels (62) into all the ring studs (61); S4, insert the steel plate frame (4), and then stack the two upper modules (2) side by side on the top side of the lower module (1); S5, rotating the threaded column (51) so that the support plate (52) supported by the connecting column (53) is supported on the inner side of the square cavity (21) of the upper module (2), rotating the threaded column (51), aligning the upper module (2), and lowering the upper module (2); S6. Pour concrete from the pouring hole (22) until the concrete is full.

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