Dry connection joint for precast concrete beam and connection method therefor

Abstract

The present invention belongs to the field of prefabricated buildings. Provided are a dry connection joint for a precast concrete beam and a connection method therefor. An upper high-strength bolt is arranged above the top surface of the precast concrete beam (within the floor slab height), so as to increase a connection moment arm of the upper high-strength bolt, and thus realize an equal-strength joint connection with the steel reinforcement in the beam by using a single large-diameter high-strength bolt, thereby greatly improving the installation convenience. Additionally, a support bracket is provided for shear resistance, and combined with the clamping action of the upper and lower high-strength bolts, bidirectional force transmission of tension and compression is achieved (under normal conditions, the upper high-strength bolt resists tension, and the lower high-strength bolt resists compression; the situation may be opposite during an earthquake), so as to cope with the moment reversal of the precast concrete beam under cyclic loading.

Description

Dry connection node of precast concrete beam and connection method thereof TECHNICAL FIELD

[0001] The present application belongs to the field of fabricated buildings, and particularly relates to a dry connection node of a precast concrete beam and a connection method thereof. BACKGROUND

[0002] In a fabricated concrete structure, the connection nodes of beams and building main bodies (such as columns or shear walls) need to be cast in situ, which leads to the need for scaffolding during beam construction, slow node connection speed, and high cost. For example, Chinese patent CN 108049633 A discloses a precast concrete frame beam-column node construction method, which relates to the connection of a precast column and a composite beam. Although the method realizes simple and fast field connection between the precast column and the composite beam, it cannot avoid wet work during the installation process of the beam column, and steel connection is required, which involves a large number of connections.

[0003] In recent years, there have also been some methods that use built-in steel at the beam end of a concrete beam and adopt bolted and welded connections. The exposed steel nodes need to be poured again, the amount of steel used in the nodes is high, and welding requires high skills. In addition, full bolt connection requires high precision, and how to achieve full bolt connection of the beam column, especially through a small number of bolts, has been a problem that engineers hope to solve. SUMMARY

[0004] The present application is a full bolt connection concrete beam fast connection node, and to this end, the present application provides a dry connection node of a precast concrete beam, which comprises a structural main body, a precast concrete beam, and a mounting assembly. The precast concrete beam is assembled and connected to the structural main body through the mounting assembly. The mounting assembly comprises:

[0005] A first mounting member, which comprises at least an upper pre-buried sleeve, a lower pre-buried sleeve, and a support seat. The upper pre-buried sleeve and the lower pre-buried sleeve are embedded in the structural main body and arranged vertically. The elevation of the upper pre-buried sleeve is higher than the top surface of the precast concrete beam, and the elevation of the lower pre-buried sleeve is higher than the bottom surface of the precast concrete beam. The support seat is provided on the structural main body.

[0006] A second mounting member, which comprises at least a second end plate, an upper high-strength bolt, and a lower high-strength bolt. The second end plate is fixed to the end of the precast concrete beam, and the second end plate is supported on the support seat. The top of the second end plate extends above the precast concrete beam to form an extension section corresponding to the upper pre-buried sleeve. The upper high-strength bolt and the lower high-strength bolt pass through the second end plate and are installed in the upper pre-buried sleeve and the lower pre-buried sleeve, respectively.

[0007] Preferably, the prefabricated concrete beam is provided with a steel cage, the steel cage comprising longitudinal reinforcement and stirrup; and the second end plate is connected to the longitudinal reinforcement.

[0008] Preferably, a reinforcing diagonal brace is formed between the extension section and the prefabricated concrete beam, the reinforcing diagonal brace being connected between the extension section and the longitudinal reinforcement.

[0009] Preferably, the reinforcing diagonal brace is a triangular plate, one of the two straight sides of the triangular plate being connected to the extension section, and the other straight side being connected to the longitudinal reinforcement; and the steel cage is provided with stirrup at least near the triangular plate.

[0010] Preferably, the number of reinforcing diagonal braces is two, and the upper high-strength bolt is located between the two reinforcing diagonal braces.

[0011] Preferably, the number of support seats is two, and the two support seats are located on the two sides of the second end plate, the side portion of the second end plate being provided with a lap joint, and the support seats are supported on the lap joint.

[0012] Preferably, the second mounting member further comprises a mounting box for mounting the lower high-strength bolt; the mounting box is arranged on the second end plate and embedded in the prefabricated concrete beam, the mounting box has an installation cavity inside, an opening at the bottom and corresponding to the bottom of the prefabricated concrete beam, and the side portion is located corresponding to the lower embedded sleeve.

[0013] Preferably, a rear filling distance adjusting gap is formed between the structural body and the second end plate, and pressure adjusting nuts are arranged on the upper high-strength bolt and the lower high-strength bolt, and the pressure adjusting nuts are located in the rear filling distance adjusting gap.

[0014] Preferably, the first mounting member further comprises a first end plate, the first end plate being fixed to the structural body by a buried member, and the support seat being arranged on the first end plate.

[0015] The upper embedded sleeve is located at the top of the first end plate, and the lower embedded sleeve is located at the bottom of the first end plate.

[0016] Preferably, the two prefabricated concrete beams are connected to the two sides of a structural body; the upper high-strength bolt and the lower high-strength bolt are respectively arranged through the structural body and pull the second end plates of the two prefabricated concrete beams.

[0017] The application also provides a connecting method of a prefabricated concrete beam dry-type connecting joint, characterized in that, comprising:

[0018] forming a structural body, and embedding and fixing an upper embedded sleeve, a lower embedded sleeve and a support seat in the structural body; the upper embedded sleeve and the lower embedded sleeve are arranged vertically;

[0019] The prefabricated concrete beam is formed, a second end plate is fixed at the end of the prefabricated concrete beam, the beam height of the prefabricated concrete beam is smaller than the distance between the upper embedded sleeve and the lower embedded sleeve, the top of the second end plate extends above the prefabricated concrete beam to form an extension section corresponding to the upper embedded sleeve, and the upper high-strength bolt and the lower high-strength bolt are arranged in the through holes of the second end plate.

[0020] The prefabricated concrete beam is hoisted to the support seat and supported by the support seat, and the upper high-strength bolt and the lower high-strength bolt are correspondingly arranged in the upper embedded sleeve and the lower embedded sleeve.

[0021] Preferably, a floor slab is formed on the prefabricated concrete beam, and the cast-in-place layer of the floor slab covers at least the upper high-strength bolt and the extension section.

[0022] The technical effects of the above technical solutions of the present application are derived from one or a combination of the following:

[0023] The upper high-strength bolt is arranged above the top surface of the prefabricated concrete beam (within the floor slab height) to increase the connection force arm of the upper high-strength bolt, thereby realizing node connection with the same strength as the steel bars in the beam by using a single large-diameter high-strength bolt, greatly improving the installation convenience; the high-strength bolt connection has a strength greater than the strength of the steel bars, thereby realizing that the bearing capacity of a single bolt is greater than the sum of the bearing capacities of all the steel bars, and single-bolt connection of the upper and lower steel bars can be realized; and the support seat is arranged to resist shear, and the upper and lower high-strength bolts are clamped to realize bidirectional force transmission (tensile resistance of the upper high-strength bolt and compressive resistance of the lower high-strength bolt when vertical load acts; the situation may be reversed when seismic load acts) to cope with the sign change of the bending moment of the prefabricated concrete beam under reciprocating load.

[0024] The beam node connection is achieved by bolt connection, the construction speed is fast, and the worker requirement is low without welding.

[0025] The shear resistance of the reinforcing diagonal brace realizes beam installation without support, and the shear force at the beam end is connected by the reinforcing diagonal brace, so that the bolt does not need to bear shear force, the bolt can be opened to adjust the error, and pre-tightening force is not needed.

[0026] The double-bolt connection on both sides of the end part can resist both compression and tension, thereby realizing that the beam and the main structure connection bear the negative bending moment under the action of gravity load and can also bear the positive bending moment that may be generated under the action of reciprocating seismic load.

[0027] The traditional bolt connection scheme has poor error adjustment capability in the length direction of the component, the error caused by the inaccurate length of the beam is adjusted by the bolts on both sides of the end plate, and the error adjustment nut can be used to adjust the gap.

[0028] The node connection does not need cast-in-place, and does not need post-poured concrete wrapping, and only needs to fill the distance adjusting gap after polymer mortar caulking.

[0029] The node uses small amount of steel, and has low cost.

[0030] The upper high-strength bolt exposed connection is convenient, and is buried in the cast-in-place part of the floor after construction and is not exposed, and the lower high-strength bolt is arranged above the beam bottom height, and can also be not exposed after construction. BRIEF DESCRIPTION OF DRAWINGS

[0031] Fig. 1 shows a structural schematic diagram of the present application.

[0032] Fig. 2 shows a front view of the present application.

[0033] Fig. 3 shows an assembly schematic diagram of one view of the present application.

[0034] Fig. 4 shows an assembly schematic diagram of another view of the present application.

[0035] Fig. 5 shows a steel structure schematic diagram of a prefabricated concrete beam in the present application.

[0036] Fig. 6 shows a steel structure assembly schematic diagram of a structural column and a prefabricated concrete beam in the present application. DETAILED DESCRIPTION

[0037] The following description is presented to enable any person skilled in the art to practice and use the application and to incorporate it into specific applications. Various modifications, and applications of the various principles of the general inventive concepts disclosed herein are obvious to those skilled in the art. The general principles defined herein can be applied to a wide range of embodiments. Thus, the present application is not to be limited to the embodiments presented, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0038] In the following detailed description, numerous specific details are set forth in order to provide a more thorough understanding of the application. However, it will be apparent to one skilled in the art that the practice of the present application can not be necessarily bound by these specific details. In other words, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring the present application.

[0039] The reader's attention is directed to all papers and documents which are filed concurrently with this specification and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference. All the features disclosed in this specification, (including any accompanying claims, abstract, and drawings) can be replaced by alternative features which serve the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed in this specification is one example only of a generic series of equivalent or similar features.

[0040] It is noted that, where used, the terms left, right, front, back, top, bottom, normal, reverse, clockwise and counterclockwise are used for convenience only and do not imply any particular fixed direction. In fact, they are used to reflect the relative position and / or orientation between various parts of the object. In addition, the terms "first", "second" are used for description purposes only and cannot be understood as indicating or implying relative importance.

[0041] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mount", "connect", "connection" should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection; can be directly connected, can also be indirectly connected through intermediate medium; can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] It is noted that, where used, further, preferably, further preferably, and more preferably are simple beginnings of another embodiment based on the foregoing embodiment, and the contents after the further, preferably, further preferably, or more preferably are combined with the foregoing embodiment as the complete structure of another embodiment. The combination of several further, preferably, further preferably, or more preferably settings after the same embodiment can form another embodiment.

[0043] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It is noted that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be understood as limiting the scope of protection of the present application in any way.

[0044] Structural embodiment:

[0045] Please refer to FIG. 1~FIG. 6, the present application provides a kind of precast concrete beam dry-type connecting node, including structural main body, precast concrete beam 2 and installation component 3, precast concrete beam 2 is assembled and connected to structural main body by installation component 3.Therein, structural main body can be structural column 1 or shear wall, and the embodiment takes structural column 1 as object and is described in detail.

[0046] Specifically, please refer to FIG. 2, FIG. 3 and FIG. 4, the mounting assembly 3 comprises a first mounting member and a second mounting member. The first mounting member comprises at least an upper embedded sleeve 313, a lower embedded sleeve 314 and a support seat 312, the upper embedded sleeve 313 and the lower embedded sleeve 314 are embedded in the structure body and arranged vertically; the elevation of the upper embedded sleeve 313 is higher than the top surface of the precast concrete beam 2, and the elevation of the lower embedded sleeve 314 is higher than the bottom surface of the precast concrete beam 2; the support seat 312 is arranged on the structure body; the second mounting member comprises at least a second end plate 321, an upper high-strength bolt 322 and a lower high-strength bolt 323, the second end plate 321 is fixed to the end of the precast concrete beam 2, the second end plate 321 is supported on the support seat 312, the top of the second end plate 321 extends above the precast concrete beam 2 to form an extension segment 3211 corresponding to the upper embedded sleeve 313, and the upper high-strength bolt 322 and the lower high-strength bolt 323 pass through the second end plate 321 and are correspondingly mounted on the upper embedded sleeve 313 and the lower embedded sleeve 314. In this embodiment, the upper high-strength bolt is arranged above the top surface of the precast concrete beam 2 (in the floor height), so as to increase the connection force arm of the upper high-strength bolt, thereby realizing the node connection with the same strength as the steel bars in the beam by using a single large-diameter high-strength bolt, and the installation convenience is greatly improved; and the support seat 312 is arranged to resist shearing, and the upper and lower high-strength bolts are clamped to realize the bidirectional force transmission in tension and compression (the upper high-strength bolt 322 resists tension and the lower high-strength bolt 323 resists compression in normal state; the upper high-strength bolt 322 may resist compression and the lower high-strength bolt 323 may resist tension in earthquake), so as to cope with the bending moment sign change of the precast concrete beam 2 under the action of reciprocating load.

[0047] The above scheme is necessary for the implementation of this embodiment, which will be described in detail below with reference to the accompanying drawings:

[0048] Please refer to FIG. 3, FIG. 5 and FIG. 6, the precast concrete beam 2 is formed in a factory and is installed by means of hoisting. Further, the precast concrete beam 2 is provided with a steel cage, the steel cage comprises longitudinal bars 21 and stirrups 22, and the second mounting member is arranged on the end plate of the precast concrete beam 2, specifically, the second end plate 321 is connected to the longitudinal bars 21.

[0049] The top of the second end plate 321 extends upward to form an extension segment 3211, which is preferably an extension plate body and is regarded as a part of the second end plate 321. In simple terms, the height of the second end plate 321 is higher than the precast concrete beam 2, and the part of the top of the second end plate 321 which is higher than the precast concrete beam 2 is defined as the extension segment 3211, which is convenient for subsequent description of the structure. The extension segment 3211 serves as a mounting member of the upper high-strength bolt, which increases the connection force arm of the upper high-strength bolt, so that the installation of the upper embedded sleeve 313 can be realized by only a single large-diameter high-strength bolt. The height of the extension segment 3211 should be lower than the height of the floor, which can be best submerged by a cast-in-place layer of the floor to hide the upper high-strength bolt of the node.

[0050] [According to Rule 91 correction 22.10.2025] Further, the reinforcing diagonal braces 325 are formed between the precast concrete beams 2, which are connected between the extension sections 3211 and the longitudinal reinforcement 21 to play a role in shear resistance. Preferably, the reinforcing diagonal braces 325 are triangular plates; one of the straight angles of the triangular plates is connected to the extension sections 3211, and the other straight angle is connected to the longitudinal reinforcement 21. Here, the extension sections 3211 and the triangular plates are steel plates, and the connection mode is welding. Further, the number of reinforcing diagonal braces 325 is two, and the high-strength bolt 322 is located between the two reinforcing diagonal braces 325 to play a role in balanced support, tie-in, and shear resistance. Preferably, a hoop 22 is directly arranged at the connection between the triangular plate and the longitudinal reinforcement 21, and the bending-resistant joint composed of the hoop 22, the longitudinal reinforcement 21, and the triangular plate prevents the high-strength bolt from pulling the second end plate 321, which will bend and cause the longitudinal reinforcement 21 to move upward, and the hoop 22 prevents deformation and displacement. Since the high-strength bolt 322 and the longitudinal reinforcement 21 are not on the same axis, the axial force of the longitudinal reinforcement 21 can be reliably transmitted through the reinforcing diagonal braces 325 and the hoop 22.

[0051] Further, in order to facilitate the pre-installation of the position of the precast concrete beam 2, in the embodiment, the number of support seats 312 is two; the two support seats 312 are located on both sides of the second end plate 321 to support and position the second end plate 321. Correspondingly, the side of the second end plate 321 is formed with a lap joint 3212, and the support seat 312 is supported on the lap joint 3212. Preferably, the lap joint 3212 is an L-shaped notch, so that the overall second end plate 321 presents an inverted convex shape. The support seat 312 is preferably a triangular plate, one of the straight angles of which is welded to the second end plate 321, and the other straight angle forms a support part.

[0052] As another preferred embodiment of the present embodiment, the support seat 312 can also be a corbel embedded and fixed in the structure main body, and the present embodiment is not limited exclusively.

[0053] In order to hide the lower high-strength bolt and facilitate installation, please refer to FIG. 5 and FIG. 6, the second mounting member further comprises a mounting box 34 for mounting the lower high-strength bolt 323; the mounting box 34 is arranged on the second end plate 321 and is embedded in the prefabricated concrete beam 2, the mounting box 34 has an installation chamber inside, the bottom has an opening and corresponds to the bottom of the prefabricated concrete beam 2, and the position of the side corresponds to the lower embedded sleeve 314. Preferably, the mounting box 34 is composed of a metal plate, the side is open, and the bottom is also open, so that the side opening corresponds to the perforated position of the lower high-strength bolt on the second end plate 321, and the opening of the bottom corresponds to the bottom surface of the prefabricated concrete beam 2, facilitating installation. Thus, the bottom of the second end plate 321, the bottom of the prefabricated concrete beam 2 and the bottom opening of the mounting box 34 are at the same level, forming a flat structure. On the one hand, it can hide the lower high-strength bolt, cooperate with the hiding of the upper high-strength bolt as described above, and realize the hiding of the bolts of the node; on the other hand, it also facilitates the subsequent installation of the ceiling at the bottom and the like.

[0054] Please refer to FIG. 2, in actual installation, there may be a little error between the beam installation interval of the two structural bodies and the actual length of the beam. Therefore, the rear filling distance adjusting gap 33 is formed between the first end plate 311 and the second end plate 321 to eliminate this error. Further, the upper high-strength bolt 322 and the lower high-strength bolt 323 are each provided with a pressure bearing adjusting nut 324, and the pressure bearing adjusting nut 324 is located in the rear filling distance adjusting gap 33. On the one hand, the pressure bearing adjusting nut 324 cooperates with the nut part of the high-strength bolt to adjust the interval between the second end plate 321 and the structural body; on the other hand, the second end plate 321 and the structural body clamping the pressure bearing adjusting nut 324 also make the pressure bearing adjusting nut 324 play a role in bearing pressure, sharing the anti-pulling of the upper high-strength bolt 322 and the anti-pressure of the lower high-strength bolt 323.

[0055] The first mounting member further comprises a first end plate 311, the first end plate 311 is fixed to the structural body through an embedded part 315, and a support seat 312 is arranged on the first end plate 311. The upper embedded sleeve 313 is positioned at the top of the first end plate 311, and the lower embedded sleeve 314 is positioned at the bottom of the first end plate 311. Specifically, the embedded part 315 is a pre-embedded steel bar, one end of which is welded to the first end plate 311 and is embedded in the structural column 1 for fixation. Further, the top and bottom of the first end plate 311 are formed with grooves adapted to the positioning of the upper embedded sleeve 313 and the lower embedded sleeve 314, and the shape of the grooves should be adapted to the outer periphery of the two embedded sleeves to facilitate the positioning of the embedded sleeves during the pouring of the structural column 1. The support seat 312 can be welded to the first end plate 311.

[0056] The embodiment can also be implemented with the installation of double-sided beams. Specifically, two prefabricated concrete beams 2 are connected to the two sides of the structural column 1. Among them, the upper high-strength bolt 322 and the lower high-strength bolt 323 are respectively inserted into the structural column 1 and pulled to the second end plate 321 of the two prefabricated concrete beams 2. At this time, the installation assembly 3 on both sides only needs one upper high-strength bolt 322 and one lower high-strength bolt 323. Because it is a pull structure, the upper embedded sleeve 313 and the lower embedded sleeve 314 can be omitted.

[0057] Advantages of the embodiment:

[0058] The upper high-strength bolt is arranged above the top surface of the prefabricated concrete beam 2 (within the floor height) to increase the connection arm of the upper high-strength bolt, thereby realizing a node connection with the same strength as the steel bars in the beam by using a single large-diameter high-strength bolt, greatly improving the installation convenience; and the shear resistance of the supporting seat 312 is combined with the clamping of the upper and lower high-strength bolts to realize bidirectional force transmission (the upper high-strength bolt 322 resists tension and the lower high-strength bolt 323 resists compression in normal state; the upper and lower high-strength bolts may be reversed during an earthquake) to cope with the sign change of the bending moment of the prefabricated concrete beam 2 under reciprocating load.

[0059] The beam node connection is connected by bolts, which has a fast construction speed and low requirements for workers without welding.

[0060] The shear resistance of the reinforcing diagonal brace 325 realizes beam installation without support, and the shear force at the beam end is connected by the reinforcing diagonal brace 325, so that the bolt does not need to bear the shear force, the bolt can be opened to adjust the error, and the pre-tightening force is not needed.

[0061] The double-bolt connection on both sides of the end part can resist both compression and tension, thereby realizing that the beam and the main structure bear the negative bending moment under the action of the gravity load and can also bear the positive bending moment that may be generated under the action of the reciprocating load of the earthquake.

[0062] The traditional bolt connection scheme has poor error adjustment capability in the length direction of the component, the error caused by the inaccurate length of the beam can be adjusted by the bolts on both sides of the end plate, and the error adjustment nut 324 can be used to adjust the gap 33.

[0063] The node connection does not need to be cast in place, and does not need to be wrapped with post-poured concrete, and only needs to be filled with the polymer mortar caulking gap 33.

[0064] The node uses less steel and has low cost.

[0065] Method embodiment:

[0066] Please refer to FIGS. 1-6, the embodiment provides a connection method of a prefabricated concrete beam dry-type connection node, including the following steps:

[0067] S1: structure body forming:

[0068] Specifically, the upper embedded sleeve 313, the lower embedded sleeve 314 and the support seat 312 are embedded and fixed in the structure body. The upper embedded sleeve 313 and the lower embedded sleeve 314 are arranged vertically. The structure body can be a structure column 1 or a shear wall. In this embodiment, the structure column 1 is taken as an object for detailed description. When the structure column 1 is cast and formed, the upper embedded sleeve, the lower embedded sleeve and the support seat are arranged in the casting mold, and are integrally formed with the structure column 1.

[0069] Further, in order to facilitate the pre-installation of the position of the prefabricated concrete beam 2, the number of the support seats 312 is two in this embodiment. As another preferred embodiment of this embodiment, the support seat 312 can also be a corbel embedded and fixed in the structure body, which is not uniquely limited in this embodiment.

[0070] The structure body is also provided with a first end plate 311, which is fixed to the structure body through an embedded part 315. The support seat 312 is arranged on the first end plate 311. The upper embedded sleeve 313 is positioned at the top of the first end plate 311, and the lower embedded sleeve 314 is positioned at the bottom of the first end plate 311. Specifically, the embedded part 315 is a pre-embedded steel bar, one end of which is welded to the first end plate 311 and is embedded in the structure column 1 for fixation. Further, the top and bottom of the first end plate 311 are formed with grooves adapted to the positioning of the upper embedded sleeve 313 and the lower embedded sleeve 314. The shape of the grooves should be adapted to the outer periphery of the two embedded sleeves to facilitate the positioning of the embedded sleeves when the structure column 1 is cast. The support seat 312 is welded to the first end plate 311.

[0071] S2: prefabricated concrete beam forming:

[0072] Specifically, a second end plate 321 is fixed to the end of the prefabricated concrete beam 2. The beam height of the prefabricated concrete beam 2 is less than the distance between the upper embedded sleeve 313 and the lower embedded sleeve 314. The top of the second end plate 321 extends above the prefabricated concrete beam 2 to form an extension segment 3211 corresponding in position to the upper embedded sleeve 313. Perforations are formed in the second end plate 321 for the upper high-strength bolt 322 and the lower high-strength bolt 323 to pass through.

[0073] The beam height of the prefabricated concrete beam 2 is less than the distance between the upper embedded sleeve 313 and the lower embedded sleeve 314, that is, the elevation of the upper embedded sleeve 313 is higher than the top surface of the prefabricated concrete beam 2, and the elevation of the lower embedded sleeve 314 is higher than the bottom surface of the prefabricated concrete beam 2.

[0074] The support seat 312 is arranged on the structural body; the second end plate 321 is fixed on the end of the prefabricated concrete beam 2, the second end plate 321 is supported on the support seat 312, the top of the second end plate 321 extends above the prefabricated concrete beam 2 to form an extension segment 3211 corresponding to the upper embedded sleeve 313, and the upper high-strength bolt 322 and the lower high-strength bolt 323 pass through the perforations of the second end plate 321 and are correspondingly installed on the upper embedded sleeve 313 and the lower embedded sleeve 314.

[0075] The prefabricated concrete beam 2 is formed in a factory and is installed by means of hoisting. Further, the prefabricated concrete beam 2 is provided with a steel cage, the steel cage includes longitudinal reinforcement 21 and stirrup 22, and the second end plate 321 is connected to the longitudinal reinforcement 21. If both ends of the prefabricated concrete beam 2 are installed by the node of the embodiment, the second end plate 321 is arranged at both ends of the prefabricated concrete beam 2, the distance between the two end plates is the length of the beam, the longitudinal reinforcement 21 is welded to the second end plate 321, the steel cage is made, and then the prefabricated concrete beam 2 is formed in a mold.

[0076] The top of the second end plate 321 extends upward to form an extension segment 3211, which is preferably an extension plate body and is considered as part of the second end plate 321. In a simple way, it can be considered that the height of the second end plate 321 is higher than that of the prefabricated concrete beam 2, and the part of the top higher than the prefabricated concrete beam 2 is defined as the extension segment 3211, which is convenient for subsequent description of the structure. The extension segment 3211 serves as a mounting member for the upper high-strength bolt, which increases the connection arm of the upper high-strength bolt, so that the installation with the upper embedded sleeve 313 can be realized by only one large-diameter high-strength bolt. The height of the extension segment 3211 should be lower than the height of the floor, which can be best submerged by the cast-in-place layer of the floor to hide the upper high-strength bolt of the node.

[0077] Further, the reinforcing diagonal braces 325 are formed between the precast concrete beams 2, which are connected between the extension sections 3211 and the longitudinal reinforcement 21 to play a role of resisting shear. Preferably, the reinforcing diagonal braces 325 are triangular plates, in which one straight angle is connected to the extension section 3211, and the other straight angle is connected to the longitudinal reinforcement 21. Here, the extension section 3211 and the triangular plate are both steel plates, and the connection mode is welding. Further, the number of the reinforcing diagonal braces 325 is two, and the upper high-strength bolt 322 is located between the two reinforcing diagonal braces 325 to play a role of balanced support, pulling and resisting shear. Preferably, a hoop 22 is directly arranged at the connection position of the triangular plate and the longitudinal reinforcement 21, and the bending-resistant joint composed of the hoop 22, the longitudinal reinforcement 21 and the triangular plate prevents the high-strength bolt from pulling the second end plate 321, which will bend to drive the longitudinal reinforcement 21 upward, and the deformation and displacement are prevented by the hoop 22, because the upper high-strength bolt 322 and the longitudinal reinforcement 22 are not on the same axis, and then the axial force of the longitudinal reinforcement 22 can be reliably transmitted through the reinforcing diagonal brace 325 and the hoop 22. Preferably, during the pouring of the precast concrete beam 2, the longitudinal reinforcement 21 is welded with the second end plate 321 to form a steel reinforcement cage, and the triangular plate is also welded on the longitudinal reinforcement 21 for the pouring of the precast concrete beam 2.

[0078] The two support seats 312 are located on both sides of the second end plate 321 to support and position the second end plate 321. Correspondingly, the side of the second end plate 321 is formed with a lap joint 3212, and the support seat 312 is supported on the lap joint 3212. Preferably, the lap joint 3212 is an L-shaped notch, so that the overall second end plate 321 presents an inverted convex shape. The support seat 312 is preferably a triangular plate, in which one straight angle is welded on the second end plate 321, and the other straight angle forms a support part.

[0079] In order to hide the lower high-strength bolt and facilitate installation, referring to FIGS. 5 and 6, the precast concrete beam 2 further includes a mounting box 34 for the lower high-strength bolt 323; the mounting box 34 is arranged on the second end plate 321 and is embedded in the precast concrete beam 2, and the mounting box 34 has an installation chamber inside, an opening at the bottom and a position corresponding to the lower embedded sleeve 314 at the side. Preferably, the mounting box 34 is composed of a metal plate, the side is open, and the bottom is also open, so that the side opening corresponds to the position of the lower high-strength bolt passing through the second end plate 321, and the opening at the bottom corresponds to the bottom surface of the precast concrete beam 2, facilitating installation. Thus, the bottom of the second end plate 321, the bottom of the precast concrete beam 2 and the bottom opening of the mounting box 34 are at the same elevation, forming a flat structure. On the one hand, the lower high-strength bolt can be hidden, and the hiding of the upper high-strength bolt is achieved, that is, the hiding of the bolts of the joint is achieved; on the other hand, it is also convenient for subsequent ceiling installation and the like at the bottom.

[0080] S3: Dry connection:

[0081] Specifically, the prefabricated concrete beam 2 is hoisted to the support seat 312 and supported by the support seat 312, and the upper high-strength bolt 322 and the lower high-strength bolt 323 are correspondingly installed in the upper embedded sleeve 313 and the lower embedded sleeve 314.

[0082] Please refer to FIG. 2. In actual installation, there may be a little error between the beam installation interval of the two structure bodies and the actual length of the beam. Therefore, the rear filling distance adjustment gap 33 is formed between the first end plate 311 and the second end plate 321 to eliminate the error. Further, the upper high-strength bolt 322 and the lower high-strength bolt 323 are each provided with a pressure bearing adjusting nut 324, which is located in the rear filling distance adjustment gap 33. On the one hand, the pressure bearing adjusting nut 324 adjusts the interval between the second end plate 321 and the structure body by cooperating with the nut part of the high-strength bolt; on the other hand, the second end plate 321 and the structure body clamping the pressure bearing adjusting nut 324 also make the pressure bearing adjusting nut 324 play a role in bearing pressure, sharing the anti-pulling of the upper high-strength bolt 322 and the anti-compression of the lower high-strength bolt 323.

[0083] Finally, the post-cast floor is formed:

[0084] The floor (not shown in the figure) is formed on the prefabricated concrete beam 2, and the cast-in-place layer of the floor can at least cover the upper high-strength bolt and the extension section to complete the complete hidden design of the upper part of the installation assembly.

[0085] The beneficial effects of the embodiment are:

[0086] The upper high-strength bolt is arranged above the top surface of the prefabricated concrete beam 2 (within the floor height) to increase the connection force arm of the upper high-strength bolt, so that the single large-diameter high-strength bolt realizes the node connection with the same strength as the steel bars in the beam, and the installation convenience is greatly improved; and the support seat 312 is arranged to resist shear, and the upper and lower high-strength bolts are clamped to realize bidirectional force transmission (the upper high-strength bolt 322 resists tension and the lower high-strength bolt 323 resists compression in normal state; the upper and lower high-strength bolts may be reversed in earthquake), so as to cope with the sign change of the bending moment of the prefabricated concrete beam 2 under the action of reciprocating load.

[0087] The beam node connection is connected by bolts, the construction speed is fast, and the weld is not required, so the requirement for workers is low.

[0088] The shear resistance of the reinforcing diagonal brace 325 realizes the beam installation without support, and the beam end shear force is connected by the reinforcing diagonal brace 325, so that the bolt does not need to bear the shear force, the bolt can be opened to adjust the error, and the pre-tightening force is not required.

[0089] The double-bolt connection on both sides of the end part makes the screw part resist both compression and tension, so as to realize that the beam and the structure body connected thereto bear the negative bending moment under the action of the gravity load and can also bear the positive bending moment that may be generated under the action of the reciprocating load of the earthquake.

[0090] The traditional bolt connection scheme has poor error adjustment capability in the length direction of the component. The present node adjusts the error caused by the length inaccuracy of the beam through the bolts on both sides of the end plate, and the gap 33 can be adjusted by the pressure adjusting nut 324.

[0091] The node connection does not need cast-in-place, nor does it need post-poured concrete wrapping, but only needs to fill the gap 33 with polymer mortar after caulking.

[0092] The node uses less steel and has low cost.

[0093] Further, the above embodiments of the present application are described in detail in combination with the drawings, and those of ordinary skill in the art can make various changes to the present application according to the above description. Thus, some details in the embodiments should not constitute a limitation on the present application, and the scope of protection of the present application will be defined by the appended claims.

Claims

1. A dry connection joint of precast concrete beams, comprising a structural body, a precast concrete beam and a mounting assembly, the precast concrete beam being assembled and connected to the structural body by means of the mounting assembly; characterized in that, The mounting assembly comprises: a first mounting member, which comprises at least an upper embedded sleeve, a lower embedded sleeve and a supporting seat, the upper embedded sleeve and the lower embedded sleeve are embedded in the structure body and arranged vertically, the upper embedded sleeve is higher than the top surface of the prefabricated concrete beam, the lower embedded sleeve is higher than the bottom surface of the prefabricated concrete beam, and the supporting seat is arranged on the structure body; a second mounting member, which comprises at least a second end plate, an upper high-strength bolt and a lower high-strength bolt, the second end plate is fixed to the end of the prefabricated concrete beam, the second end plate is supported by the supporting seat, the top of the second end plate extends above the prefabricated concrete beam to form an extension section corresponding to the upper embedded sleeve, and the upper high-strength bolt and the lower high-strength bolt pass through the second end plate and are correspondingly mounted in the upper embedded sleeve and the lower embedded sleeve.

2. The precast concrete beam dry connected joint of claim 1, wherein: The prefabricated concrete beam is provided with a steel cage, and the steel cage comprises longitudinal reinforcement and stirrups; the second end plate is connected to the longitudinal reinforcement.

3. The precast concrete beam dry connected joint of claim 2, wherein: The extension section and the prefabricated concrete beam form a reinforcing inclined strut, and the reinforcing inclined strut is connected between the extension section and the longitudinal reinforcement.

4. A precast concrete beam dry joint connection as claimed in claim 3 wherein: The reinforcing inclined strut is a triangular plate, one of the two right-angled sides of the triangular plate is connected to the extension section, and the other right-angled side is connected to the longitudinal reinforcement; the steel cage is provided with stirrups at least near the triangular plate.

5. A precast concrete beam dry joint connection as claimed in claim 4 wherein: The number of reinforcing inclined struts is two, and the upper high-strength bolt is located between the two reinforcing inclined struts.

6. The precast concrete beam dry connected joint of claim 1, wherein: The number of supporting seats is two, the two supporting seats are located on the two sides of the second end plate, the side of the second end plate is provided with a lap joint, and the supporting seat is supported by the lap joint.

7. The precast concrete beam dry connected joint of claim 1, wherein: The second mounting member further comprises a mounting box for mounting the lower high-strength bolt; the mounting box is arranged on the second end plate and embedded in the prefabricated concrete beam, the mounting box has an installation cavity in the inside, an opening in the bottom and a position corresponding to the lower embedded sleeve in the side.

8. The precast concrete beam dry connected joint of claim 1, wherein: A rear filling distance adjusting gap is formed between the structure body and the second end plate, and a pressure adjusting nut is arranged on each of the upper high-strength bolt and the lower high-strength bolt, and the pressure adjusting nut is located in the rear filling distance adjusting gap.

9. The precast concrete beam dry connected joint of claim 1, wherein: The first mounting member further comprises a first end plate, the first end plate is fixed to the structure body by a buried part, and the supporting seat is arranged on the first end plate; The upper embedded sleeve is located on the top of the first end plate, and the lower embedded sleeve is located on the bottom of the first end plate.

10. A method of connecting precast concrete beams in a dry joint connection as claimed in any one of claims 1 to 9, wherein, The structure body is formed, and the upper embedded sleeve, the lower embedded sleeve and the supporting seat are embedded in the structure body; the upper embedded sleeve and the lower embedded sleeve are arranged vertically; The prefabricated concrete beam is formed, the second end plate is fixed to the end of the prefabricated concrete beam, the beam height of the prefabricated concrete beam is smaller than the distance between the upper embedded sleeve and the lower embedded sleeve, the top of the second end plate extends above the prefabricated concrete beam to form an extension section corresponding to the upper embedded sleeve, and a through hole is arranged on the second end plate for the upper high-strength bolt and the lower high-strength bolt to pass through; ​ Dry connection, hoisting the precast concrete beam to the support seat and being supported by the support seat, and corresponding installation of the upper high-strength bolt and the lower high-strength bolt to the upper pre-buried sleeve and the lower pre-buried sleeve.

11. The method of joining as defined in claim 10, wherein, Forming a floor slab on the precast concrete beam, and the cast-in-place layer of the floor slab at least covers the upper high-strength bolt and the extended section.

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